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237.2.65
(compared to revision 237.16.16)
: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2009-02-07 04:50:39 UTC
- mto: (24.1.133 mandos) (237.4.2 mandos-pipe-ipc) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 250.
- Revision ID: teddy@fukt.bsnet.se-20090207045039-xkr6b80vtqwqrq8l
* Makefile (install-client-nokey): Move "initramfs-tools-script" from
"/scripts/local-top/mandos" to
"/scripts/init-premount/mandos".
(uninstall-client): - '' -
* debian/mandos-client.dirs: - '' -
* initramfs-tools-script (PREREQ): Added "udev".
"/scripts/local-top/mandos" to
"/scripts/init-premount/mandos".
(uninstall-client): - '' -
* debian/mandos-client.dirs: - '' -
* initramfs-tools-script (PREREQ): Added "udev".
- files removed:
- DBUS-API
- debian/source
- 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 © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 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
36
#ifndef _FILE_OFFSET_BITS
37
34
#define _FILE_OFFSET_BITS 64
38
#endif
39
35
40
36
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
37
42
38
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
39
stdout, ferror(), sscanf(),
40
remove() */
44
41
#include <stdint.h> /* uint16_t, uint32_t */
45
42
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
#include <stdbool.h> /* bool, false, true */
43
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
44
srand() */
45
#include <stdbool.h> /* bool, true */
49
46
#include <string.h> /* memset(), strcmp(), strlen(),
50
47
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
48
#include <sys/ioctl.h> /* ioctl */
52
49
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
50
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
51
SOCK_STREAM, INET6_ADDRSTRLEN,
52
uid_t, gid_t, open(), opendir(),
53
DIR */
54
#include <sys/stat.h> /* open() */
57
55
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
56
struct in6_addr, inet_pton(),
57
connect() */
59
58
#include <fcntl.h> /* open() */
60
59
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
60
*/
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
61
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
64
62
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
63
#include <errno.h> /* perror(), errno */
64
#include <time.h> /* nanosleep(), time() */
68
65
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
66
SIOCSIFFLAGS, if_indextoname(),
70
67
if_nametoindex(), IF_NAMESIZE */
71
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
*/
68
#include <netinet/in.h>
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, inet_ntop() */
78
#include <iso646.h> /* not, or, and */
70
getuid(), getgid(), setuid(),
71
setgid() */
72
#include <arpa/inet.h> /* inet_pton(), htons */
73
#include <iso646.h> /* not, and, or */
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
#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
92
78
#ifdef __linux__
93
79
#include <sys/klog.h> /* klogctl() */
94
#endif /* __linux__ */
80
#endif
95
81
96
82
/* Avahi */
97
83
/* All Avahi types, constants and functions
111
97
init_gnutls_session(),
112
98
GNUTLS_* */
113
99
#include <gnutls/openpgp.h>
114
/* gnutls_certificate_set_openpgp_key_file(),
115
GNUTLS_OPENPGP_FMT_BASE64 */
100
/* gnutls_certificate_set_openpgp_key_file(),
101
GNUTLS_OPENPGP_FMT_BASE64 */
116
102
117
103
/* GPGME */
118
104
#include <gpgme.h> /* All GPGME types, constants and
126
112
#define PATHDIR "/conf/conf.d/mandos"
127
113
#define SECKEY "seckey.txt"
128
114
#define PUBKEY "pubkey.txt"
129
#define HOOKDIR "/lib/mandos/network-hooks.d"
130
115
131
116
bool debug = false;
132
117
static const char mandos_protocol_version[] = "1";
133
118
const char *argp_program_version = "mandos-client " VERSION;
134
const char *argp_program_bug_address = "<mandos@recompile.se>";
135
static const char sys_class_net[] = "/sys/class/net";
136
char *connect_to = NULL;
137
const char *hookdir = HOOKDIR;
138
139
/* Doubly linked list that need to be circularly linked when used */
140
typedef struct server{
141
const char *ip;
142
uint16_t port;
143
AvahiIfIndex if_index;
144
int af;
145
struct timespec last_seen;
146
struct server *next;
147
struct server *prev;
148
} server;
119
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
149
120
150
121
/* Used for passing in values through the Avahi callback functions */
151
122
typedef struct {
156
127
gnutls_dh_params_t dh_params;
157
128
const char *priority;
158
129
gpgme_ctx_t ctx;
159
server *current_server;
160
130
} mandos_context;
161
131
162
/* global context so signal handler can reach it*/
163
mandos_context mc = { .simple_poll = NULL, .server = NULL,
164
.dh_bits = 1024, .priority = "SECURE256"
165
":!CTYPE-X.509:+CTYPE-OPENPGP",
166
.current_server = NULL };
167
168
sig_atomic_t quit_now = 0;
169
int signal_received = 0;
170
171
/* Function to use when printing errors */
172
void perror_plus(const char *print_text){
173
fprintf(stderr, "Mandos plugin %s: ",
174
program_invocation_short_name);
175
perror(print_text);
176
}
177
178
int fprintf_plus(FILE *stream, const char *format, ...){
179
va_list ap;
180
va_start (ap, format);
181
182
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
183
program_invocation_short_name));
184
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
185
}
186
187
132
/*
188
* Make additional room in "buffer" for at least BUFFER_SIZE more
189
* bytes. "buffer_capacity" is how much is currently allocated,
133
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
134
* "buffer_capacity" is how much is currently allocated,
190
135
* "buffer_length" is how much is already used.
191
136
*/
192
size_t incbuffer(char **buffer, size_t buffer_length,
193
size_t buffer_capacity){
137
size_t adjustbuffer(char **buffer, size_t buffer_length,
138
size_t buffer_capacity){
194
139
if(buffer_length + BUFFER_SIZE > buffer_capacity){
195
140
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
196
141
if(buffer == NULL){
201
146
return buffer_capacity;
202
147
}
203
148
204
/* Add server to set of servers to retry periodically */
205
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
206
int af){
207
int ret;
208
server *new_server = malloc(sizeof(server));
209
if(new_server == NULL){
210
perror_plus("malloc");
211
return -1;
212
}
213
*new_server = (server){ .ip = strdup(ip),
214
.port = port,
215
.if_index = if_index,
216
.af = af };
217
if(new_server->ip == NULL){
218
perror_plus("strdup");
219
return -1;
220
}
221
/* Special case of first server */
222
if (mc.current_server == NULL){
223
new_server->next = new_server;
224
new_server->prev = new_server;
225
mc.current_server = new_server;
226
/* Place the new server last in the list */
227
} else {
228
new_server->next = mc.current_server;
229
new_server->prev = mc.current_server->prev;
230
new_server->prev->next = new_server;
231
mc.current_server->prev = new_server;
232
}
233
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
234
if(ret == -1){
235
perror_plus("clock_gettime");
236
return -1;
237
}
238
return 0;
239
}
240
241
149
/*
242
150
* Initialize GPGME.
243
151
*/
244
static bool init_gpgme(const char *seckey, const char *pubkey,
245
const char *tempdir){
152
static bool init_gpgme(mandos_context *mc, const char *seckey,
153
const char *pubkey, const char *tempdir){
154
int ret;
246
155
gpgme_error_t rc;
247
156
gpgme_engine_info_t engine_info;
248
157
251
160
* Helper function to insert pub and seckey to the engine keyring.
252
161
*/
253
162
bool import_key(const char *filename){
254
int ret;
255
163
int fd;
256
164
gpgme_data_t pgp_data;
257
165
258
166
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
259
167
if(fd == -1){
260
perror_plus("open");
168
perror("open");
261
169
return false;
262
170
}
263
171
264
172
rc = gpgme_data_new_from_fd(&pgp_data, fd);
265
173
if(rc != GPG_ERR_NO_ERROR){
266
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
267
gpgme_strsource(rc), gpgme_strerror(rc));
174
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
175
gpgme_strsource(rc), gpgme_strerror(rc));
268
176
return false;
269
177
}
270
178
271
rc = gpgme_op_import(mc.ctx, pgp_data);
179
rc = gpgme_op_import(mc->ctx, pgp_data);
272
180
if(rc != GPG_ERR_NO_ERROR){
273
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
274
gpgme_strsource(rc), gpgme_strerror(rc));
181
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
182
gpgme_strsource(rc), gpgme_strerror(rc));
275
183
return false;
276
184
}
277
185
278
186
ret = (int)TEMP_FAILURE_RETRY(close(fd));
279
187
if(ret == -1){
280
perror_plus("close");
188
perror("close");
281
189
}
282
190
gpgme_data_release(pgp_data);
283
191
return true;
284
192
}
285
193
286
194
if(debug){
287
fprintf_plus(stderr, "Initializing GPGME\n");
195
fprintf(stderr, "Initialize gpgme\n");
288
196
}
289
197
290
198
/* Init GPGME */
291
199
gpgme_check_version(NULL);
292
200
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
293
201
if(rc != GPG_ERR_NO_ERROR){
294
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
295
gpgme_strsource(rc), gpgme_strerror(rc));
202
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
203
gpgme_strsource(rc), gpgme_strerror(rc));
296
204
return false;
297
205
}
298
206
299
/* Set GPGME home directory for the OpenPGP engine only */
207
/* Set GPGME home directory for the OpenPGP engine only */
300
208
rc = gpgme_get_engine_info(&engine_info);
301
209
if(rc != GPG_ERR_NO_ERROR){
302
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
303
gpgme_strsource(rc), gpgme_strerror(rc));
210
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
211
gpgme_strsource(rc), gpgme_strerror(rc));
304
212
return false;
305
213
}
306
214
while(engine_info != NULL){
312
220
engine_info = engine_info->next;
313
221
}
314
222
if(engine_info == NULL){
315
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
316
tempdir);
223
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
317
224
return false;
318
225
}
319
226
320
227
/* Create new GPGME "context" */
321
rc = gpgme_new(&(mc.ctx));
228
rc = gpgme_new(&(mc->ctx));
322
229
if(rc != GPG_ERR_NO_ERROR){
323
fprintf_plus(stderr, "Mandos plugin mandos-client: "
324
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
325
gpgme_strerror(rc));
230
fprintf(stderr, "bad gpgme_new: %s: %s\n",
231
gpgme_strsource(rc), gpgme_strerror(rc));
326
232
return false;
327
233
}
328
234
330
236
return false;
331
237
}
332
238
333
return true;
239
return true;
334
240
}
335
241
336
242
/*
337
243
* Decrypt OpenPGP data.
338
244
* Returns -1 on error
339
245
*/
340
static ssize_t pgp_packet_decrypt(const char *cryptotext,
246
static ssize_t pgp_packet_decrypt(const mandos_context *mc,
247
const char *cryptotext,
341
248
size_t crypto_size,
342
249
char **plaintext){
343
250
gpgme_data_t dh_crypto, dh_plain;
347
254
ssize_t plaintext_length = 0;
348
255
349
256
if(debug){
350
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
257
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
351
258
}
352
259
353
260
/* Create new GPGME data buffer from memory cryptotext */
354
261
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
355
262
0);
356
263
if(rc != GPG_ERR_NO_ERROR){
357
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
358
gpgme_strsource(rc), gpgme_strerror(rc));
264
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
265
gpgme_strsource(rc), gpgme_strerror(rc));
359
266
return -1;
360
267
}
361
268
362
269
/* Create new empty GPGME data buffer for the plaintext */
363
270
rc = gpgme_data_new(&dh_plain);
364
271
if(rc != GPG_ERR_NO_ERROR){
365
fprintf_plus(stderr, "Mandos plugin mandos-client: "
366
"bad gpgme_data_new: %s: %s\n",
367
gpgme_strsource(rc), gpgme_strerror(rc));
272
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
273
gpgme_strsource(rc), gpgme_strerror(rc));
368
274
gpgme_data_release(dh_crypto);
369
275
return -1;
370
276
}
371
277
372
278
/* Decrypt data from the cryptotext data buffer to the plaintext
373
279
data buffer */
374
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
280
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
375
281
if(rc != GPG_ERR_NO_ERROR){
376
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
377
gpgme_strsource(rc), gpgme_strerror(rc));
282
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
283
gpgme_strsource(rc), gpgme_strerror(rc));
378
284
plaintext_length = -1;
379
285
if(debug){
380
286
gpgme_decrypt_result_t result;
381
result = gpgme_op_decrypt_result(mc.ctx);
287
result = gpgme_op_decrypt_result(mc->ctx);
382
288
if(result == NULL){
383
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
289
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
384
290
} else {
385
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
386
result->unsupported_algorithm);
387
fprintf_plus(stderr, "Wrong key usage: %u\n",
388
result->wrong_key_usage);
291
fprintf(stderr, "Unsupported algorithm: %s\n",
292
result->unsupported_algorithm);
293
fprintf(stderr, "Wrong key usage: %u\n",
294
result->wrong_key_usage);
389
295
if(result->file_name != NULL){
390
fprintf_plus(stderr, "File name: %s\n", result->file_name);
296
fprintf(stderr, "File name: %s\n", result->file_name);
391
297
}
392
298
gpgme_recipient_t recipient;
393
299
recipient = result->recipients;
394
while(recipient != NULL){
395
fprintf_plus(stderr, "Public key algorithm: %s\n",
396
gpgme_pubkey_algo_name
397
(recipient->pubkey_algo));
398
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
399
fprintf_plus(stderr, "Secret key available: %s\n",
400
recipient->status == GPG_ERR_NO_SECKEY
401
? "No" : "Yes");
402
recipient = recipient->next;
300
if(recipient){
301
while(recipient != NULL){
302
fprintf(stderr, "Public key algorithm: %s\n",
303
gpgme_pubkey_algo_name(recipient->pubkey_algo));
304
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
305
fprintf(stderr, "Secret key available: %s\n",
306
recipient->status == GPG_ERR_NO_SECKEY
307
? "No" : "Yes");
308
recipient = recipient->next;
309
}
403
310
}
404
311
}
405
312
}
407
314
}
408
315
409
316
if(debug){
410
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
317
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
411
318
}
412
319
413
320
/* Seek back to the beginning of the GPGME plaintext data buffer */
414
321
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
415
perror_plus("gpgme_data_seek");
322
perror("gpgme_data_seek");
416
323
plaintext_length = -1;
417
324
goto decrypt_end;
418
325
}
419
326
420
327
*plaintext = NULL;
421
328
while(true){
422
plaintext_capacity = incbuffer(plaintext,
423
(size_t)plaintext_length,
424
plaintext_capacity);
329
plaintext_capacity = adjustbuffer(plaintext,
330
(size_t)plaintext_length,
331
plaintext_capacity);
425
332
if(plaintext_capacity == 0){
426
perror_plus("incbuffer");
427
plaintext_length = -1;
428
goto decrypt_end;
333
perror("adjustbuffer");
334
plaintext_length = -1;
335
goto decrypt_end;
429
336
}
430
337
431
338
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
436
343
break;
437
344
}
438
345
if(ret < 0){
439
perror_plus("gpgme_data_read");
346
perror("gpgme_data_read");
440
347
plaintext_length = -1;
441
348
goto decrypt_end;
442
349
}
444
351
}
445
352
446
353
if(debug){
447
fprintf_plus(stderr, "Decrypted password is: ");
354
fprintf(stderr, "Decrypted password is: ");
448
355
for(ssize_t i = 0; i < plaintext_length; i++){
449
356
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
450
357
}
472
379
/* GnuTLS log function callback */
473
380
static void debuggnutls(__attribute__((unused)) int level,
474
381
const char* string){
475
fprintf_plus(stderr, "GnuTLS: %s", string);
382
fprintf(stderr, "GnuTLS: %s", string);
476
383
}
477
384
478
static int init_gnutls_global(const char *pubkeyfilename,
385
static int init_gnutls_global(mandos_context *mc,
386
const char *pubkeyfilename,
479
387
const char *seckeyfilename){
480
388
int ret;
481
389
482
390
if(debug){
483
fprintf_plus(stderr, "Initializing GnuTLS\n");
391
fprintf(stderr, "Initializing GnuTLS\n");
484
392
}
485
393
486
394
ret = gnutls_global_init();
487
395
if(ret != GNUTLS_E_SUCCESS){
488
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
489
safer_gnutls_strerror(ret));
396
fprintf(stderr, "GnuTLS global_init: %s\n",
397
safer_gnutls_strerror(ret));
490
398
return -1;
491
399
}
492
400
499
407
}
500
408
501
409
/* OpenPGP credentials */
502
ret = gnutls_certificate_allocate_credentials(&mc.cred);
410
gnutls_certificate_allocate_credentials(&mc->cred);
503
411
if(ret != GNUTLS_E_SUCCESS){
504
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
505
safer_gnutls_strerror(ret));
412
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
413
* from
414
* -Wunreachable-code
415
*/
416
safer_gnutls_strerror(ret));
506
417
gnutls_global_deinit();
507
418
return -1;
508
419
}
509
420
510
421
if(debug){
511
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
512
" secret key %s as GnuTLS credentials\n",
513
pubkeyfilename,
514
seckeyfilename);
422
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
423
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
424
seckeyfilename);
515
425
}
516
426
517
427
ret = gnutls_certificate_set_openpgp_key_file
518
(mc.cred, pubkeyfilename, seckeyfilename,
428
(mc->cred, pubkeyfilename, seckeyfilename,
519
429
GNUTLS_OPENPGP_FMT_BASE64);
520
430
if(ret != GNUTLS_E_SUCCESS){
521
fprintf_plus(stderr,
522
"Error[%d] while reading the OpenPGP key pair ('%s',"
523
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
524
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
525
safer_gnutls_strerror(ret));
431
fprintf(stderr,
432
"Error[%d] while reading the OpenPGP key pair ('%s',"
433
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
434
fprintf(stderr, "The GnuTLS error is: %s\n",
435
safer_gnutls_strerror(ret));
526
436
goto globalfail;
527
437
}
528
438
529
439
/* GnuTLS server initialization */
530
ret = gnutls_dh_params_init(&mc.dh_params);
440
ret = gnutls_dh_params_init(&mc->dh_params);
531
441
if(ret != GNUTLS_E_SUCCESS){
532
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
533
" initialization: %s\n",
534
safer_gnutls_strerror(ret));
442
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
443
" %s\n", safer_gnutls_strerror(ret));
535
444
goto globalfail;
536
445
}
537
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
446
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
538
447
if(ret != GNUTLS_E_SUCCESS){
539
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
540
safer_gnutls_strerror(ret));
448
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
449
safer_gnutls_strerror(ret));
541
450
goto globalfail;
542
451
}
543
452
544
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
453
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
545
454
546
455
return 0;
547
456
548
457
globalfail:
549
458
550
gnutls_certificate_free_credentials(mc.cred);
459
gnutls_certificate_free_credentials(mc->cred);
551
460
gnutls_global_deinit();
552
gnutls_dh_params_deinit(mc.dh_params);
461
gnutls_dh_params_deinit(mc->dh_params);
553
462
return -1;
554
463
}
555
464
556
static int init_gnutls_session(gnutls_session_t *session){
465
static int init_gnutls_session(mandos_context *mc,
466
gnutls_session_t *session){
557
467
int ret;
558
468
/* GnuTLS session creation */
559
do {
560
ret = gnutls_init(session, GNUTLS_SERVER);
561
if(quit_now){
562
return -1;
563
}
564
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
469
ret = gnutls_init(session, GNUTLS_SERVER);
565
470
if(ret != GNUTLS_E_SUCCESS){
566
fprintf_plus(stderr,
567
"Error in GnuTLS session initialization: %s\n",
568
safer_gnutls_strerror(ret));
471
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
472
safer_gnutls_strerror(ret));
569
473
}
570
474
571
475
{
572
476
const char *err;
573
do {
574
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
575
if(quit_now){
576
gnutls_deinit(*session);
577
return -1;
578
}
579
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
477
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
580
478
if(ret != GNUTLS_E_SUCCESS){
581
fprintf_plus(stderr, "Syntax error at: %s\n", err);
582
fprintf_plus(stderr, "GnuTLS error: %s\n",
583
safer_gnutls_strerror(ret));
479
fprintf(stderr, "Syntax error at: %s\n", err);
480
fprintf(stderr, "GnuTLS error: %s\n",
481
safer_gnutls_strerror(ret));
584
482
gnutls_deinit(*session);
585
483
return -1;
586
484
}
587
485
}
588
486
589
do {
590
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
591
mc.cred);
592
if(quit_now){
593
gnutls_deinit(*session);
594
return -1;
595
}
596
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
487
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
488
mc->cred);
597
489
if(ret != GNUTLS_E_SUCCESS){
598
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
599
safer_gnutls_strerror(ret));
490
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
491
safer_gnutls_strerror(ret));
600
492
gnutls_deinit(*session);
601
493
return -1;
602
494
}
603
495
604
496
/* ignore client certificate if any. */
605
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
497
gnutls_certificate_server_set_request(*session,
498
GNUTLS_CERT_IGNORE);
606
499
607
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
500
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
608
501
609
502
return 0;
610
503
}
616
509
/* Called when a Mandos server is found */
617
510
static int start_mandos_communication(const char *ip, uint16_t port,
618
511
AvahiIfIndex if_index,
619
int af){
620
int ret, tcp_sd = -1;
512
mandos_context *mc){
513
int ret, tcp_sd;
621
514
ssize_t sret;
622
union {
623
struct sockaddr_in in;
624
struct sockaddr_in6 in6;
625
} to;
515
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
626
516
char *buffer = NULL;
627
char *decrypted_buffer = NULL;
517
char *decrypted_buffer;
628
518
size_t buffer_length = 0;
629
519
size_t buffer_capacity = 0;
520
ssize_t decrypted_buffer_size;
630
521
size_t written;
631
int retval = -1;
522
int retval = 0;
523
char interface[IF_NAMESIZE];
632
524
gnutls_session_t session;
633
int pf; /* Protocol family */
634
635
errno = 0;
636
637
if(quit_now){
638
errno = EINTR;
639
return -1;
640
}
641
642
switch(af){
643
case AF_INET6:
644
pf = PF_INET6;
645
break;
646
case AF_INET:
647
pf = PF_INET;
648
break;
649
default:
650
fprintf_plus(stderr, "Bad address family: %d\n", af);
651
errno = EINVAL;
652
return -1;
653
}
654
655
ret = init_gnutls_session(&session);
525
526
ret = init_gnutls_session(mc, &session);
656
527
if(ret != 0){
657
528
return -1;
658
529
}
659
530
660
531
if(debug){
661
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
662
PRIu16 "\n", ip, port);
532
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
533
"\n", ip, port);
663
534
}
664
535
665
tcp_sd = socket(pf, SOCK_STREAM, 0);
536
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
666
537
if(tcp_sd < 0){
667
int e = errno;
668
perror_plus("socket");
669
errno = e;
670
goto mandos_end;
538
perror("socket");
539
return -1;
671
540
}
672
541
673
if(quit_now){
674
errno = EINTR;
675
goto mandos_end;
542
if(debug){
543
if(if_indextoname((unsigned int)if_index, interface) == NULL){
544
perror("if_indextoname");
545
return -1;
546
}
547
fprintf(stderr, "Binding to interface %s\n", interface);
676
548
}
677
549
678
550
memset(&to, 0, sizeof(to));
679
if(af == AF_INET6){
680
to.in6.sin6_family = (sa_family_t)af;
681
ret = inet_pton(af, ip, &to.in6.sin6_addr);
682
} else { /* IPv4 */
683
to.in.sin_family = (sa_family_t)af;
684
ret = inet_pton(af, ip, &to.in.sin_addr);
685
}
551
to.in6.sin6_family = AF_INET6;
552
/* It would be nice to have a way to detect if we were passed an
553
IPv4 address here. Now we assume an IPv6 address. */
554
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
686
555
if(ret < 0 ){
687
int e = errno;
688
perror_plus("inet_pton");
689
errno = e;
690
goto mandos_end;
556
perror("inet_pton");
557
return -1;
691
558
}
692
559
if(ret == 0){
693
int e = errno;
694
fprintf_plus(stderr, "Bad address: %s\n", ip);
695
errno = e;
696
goto mandos_end;
560
fprintf(stderr, "Bad address: %s\n", ip);
561
return -1;
697
562
}
698
if(af == AF_INET6){
699
to.in6.sin6_port = htons(port); /* Spurious warnings from
700
-Wconversion and
701
-Wunreachable-code */
702
703
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
704
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
705
-Wunreachable-code*/
706
if(if_index == AVAHI_IF_UNSPEC){
707
fprintf_plus(stderr, "An IPv6 link-local address is"
708
" incomplete without a network interface\n");
709
errno = EINVAL;
710
goto mandos_end;
711
}
712
/* Set the network interface number as scope */
713
to.in6.sin6_scope_id = (uint32_t)if_index;
714
}
715
} else {
716
to.in.sin_port = htons(port); /* Spurious warnings from
563
to.in6.sin6_port = htons(port); /* Spurious warnings from
717
564
-Wconversion and
718
565
-Wunreachable-code */
719
}
720
566
721
if(quit_now){
722
errno = EINTR;
723
goto mandos_end;
724
}
567
to.in6.sin6_scope_id = (uint32_t)if_index;
725
568
726
569
if(debug){
727
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
728
char interface[IF_NAMESIZE];
729
if(if_indextoname((unsigned int)if_index, interface) == NULL){
730
perror_plus("if_indextoname");
731
} else {
732
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
733
"\n", ip, interface, port);
734
}
735
} else {
736
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
737
ip, port);
738
}
739
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
740
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
741
const char *pcret;
742
if(af == AF_INET6){
743
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
744
sizeof(addrstr));
745
} else {
746
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
747
sizeof(addrstr));
748
}
749
if(pcret == NULL){
750
perror_plus("inet_ntop");
570
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
571
port);
572
char addrstr[INET6_ADDRSTRLEN] = "";
573
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
574
sizeof(addrstr)) == NULL){
575
perror("inet_ntop");
751
576
} else {
752
577
if(strcmp(addrstr, ip) != 0){
753
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
578
fprintf(stderr, "Canonical address form: %s\n", addrstr);
754
579
}
755
580
}
756
581
}
757
582
758
if(quit_now){
759
errno = EINTR;
760
goto mandos_end;
761
}
762
763
if(af == AF_INET6){
764
ret = connect(tcp_sd, &to.in6, sizeof(to));
765
} else {
766
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
767
}
583
ret = connect(tcp_sd, &to.in, sizeof(to));
768
584
if(ret < 0){
769
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
770
int e = errno;
771
perror_plus("connect");
772
errno = e;
773
}
774
goto mandos_end;
775
}
776
777
if(quit_now){
778
errno = EINTR;
779
goto mandos_end;
585
perror("connect");
586
return -1;
780
587
}
781
588
782
589
const char *out = mandos_protocol_version;
784
591
while(true){
785
592
size_t out_size = strlen(out);
786
593
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
787
out_size - written));
594
out_size - written));
788
595
if(ret == -1){
789
int e = errno;
790
perror_plus("write");
791
errno = e;
596
perror("write");
597
retval = -1;
792
598
goto mandos_end;
793
599
}
794
600
written += (size_t)ret;
802
608
break;
803
609
}
804
610
}
805
806
if(quit_now){
807
errno = EINTR;
808
goto mandos_end;
809
}
810
611
}
811
612
812
613
if(debug){
813
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
814
}
815
816
if(quit_now){
817
errno = EINTR;
818
goto mandos_end;
819
}
820
821
/* Spurious warning from -Wint-to-pointer-cast */
614
fprintf(stderr, "Establishing TLS session with %s\n", ip);
615
}
616
822
617
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
823
618
824
if(quit_now){
825
errno = EINTR;
826
goto mandos_end;
827
}
828
829
do {
619
do{
830
620
ret = gnutls_handshake(session);
831
if(quit_now){
832
errno = EINTR;
833
goto mandos_end;
834
}
835
621
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
836
622
837
623
if(ret != GNUTLS_E_SUCCESS){
838
624
if(debug){
839
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
625
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
840
626
gnutls_perror(ret);
841
627
}
842
errno = EPROTO;
628
retval = -1;
843
629
goto mandos_end;
844
630
}
845
631
846
632
/* Read OpenPGP packet that contains the wanted password */
847
633
848
634
if(debug){
849
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
850
" %s\n", ip);
635
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
636
ip);
851
637
}
852
638
853
639
while(true){
854
855
if(quit_now){
856
errno = EINTR;
857
goto mandos_end;
858
}
859
860
buffer_capacity = incbuffer(&buffer, buffer_length,
861
buffer_capacity);
640
buffer_capacity = adjustbuffer(&buffer, buffer_length,
641
buffer_capacity);
862
642
if(buffer_capacity == 0){
863
int e = errno;
864
perror_plus("incbuffer");
865
errno = e;
866
goto mandos_end;
867
}
868
869
if(quit_now){
870
errno = EINTR;
643
perror("adjustbuffer");
644
retval = -1;
871
645
goto mandos_end;
872
646
}
873
647
882
656
case GNUTLS_E_AGAIN:
883
657
break;
884
658
case GNUTLS_E_REHANDSHAKE:
885
do {
659
do{
886
660
ret = gnutls_handshake(session);
887
888
if(quit_now){
889
errno = EINTR;
890
goto mandos_end;
891
}
892
661
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
893
662
if(ret < 0){
894
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
895
"***\n");
663
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
896
664
gnutls_perror(ret);
897
errno = EPROTO;
665
retval = -1;
898
666
goto mandos_end;
899
667
}
900
668
break;
901
669
default:
902
fprintf_plus(stderr, "Unknown error while reading data from"
903
" encrypted session with Mandos server\n");
670
fprintf(stderr, "Unknown error while reading data from"
671
" encrypted session with Mandos server\n");
672
retval = -1;
904
673
gnutls_bye(session, GNUTLS_SHUT_RDWR);
905
errno = EIO;
906
674
goto mandos_end;
907
675
}
908
676
} else {
911
679
}
912
680
913
681
if(debug){
914
fprintf_plus(stderr, "Closing TLS session\n");
915
}
916
917
if(quit_now){
918
errno = EINTR;
919
goto mandos_end;
920
}
921
922
do {
923
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
924
if(quit_now){
925
errno = EINTR;
926
goto mandos_end;
927
}
928
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
682
fprintf(stderr, "Closing TLS session\n");
683
}
684
685
gnutls_bye(session, GNUTLS_SHUT_RDWR);
929
686
930
687
if(buffer_length > 0){
931
ssize_t decrypted_buffer_size;
932
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
688
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
689
buffer_length,
933
690
&decrypted_buffer);
934
691
if(decrypted_buffer_size >= 0){
935
936
692
written = 0;
937
693
while(written < (size_t) decrypted_buffer_size){
938
if(quit_now){
939
errno = EINTR;
940
goto mandos_end;
941
}
942
943
694
ret = (int)fwrite(decrypted_buffer + written, 1,
944
695
(size_t)decrypted_buffer_size - written,
945
696
stdout);
946
697
if(ret == 0 and ferror(stdout)){
947
int e = errno;
948
698
if(debug){
949
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
950
strerror(errno));
699
fprintf(stderr, "Error writing encrypted data: %s\n",
700
strerror(errno));
951
701
}
952
errno = e;
953
goto mandos_end;
702
retval = -1;
703
break;
954
704
}
955
705
written += (size_t)ret;
956
706
}
957
retval = 0;
707
free(decrypted_buffer);
708
} else {
709
retval = -1;
958
710
}
711
} else {
712
retval = -1;
959
713
}
960
714
961
715
/* Shutdown procedure */
962
716
963
717
mandos_end:
964
{
965
int e = errno;
966
free(decrypted_buffer);
967
free(buffer);
968
if(tcp_sd >= 0){
969
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
970
}
971
if(ret == -1){
972
if(e == 0){
973
e = errno;
974
}
975
perror_plus("close");
976
}
977
gnutls_deinit(session);
978
errno = e;
979
if(quit_now){
980
errno = EINTR;
981
retval = -1;
982
}
718
free(buffer);
719
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
720
if(ret == -1){
721
perror("close");
983
722
}
723
gnutls_deinit(session);
984
724
return retval;
985
725
}
986
726
987
727
static void resolve_callback(AvahiSServiceResolver *r,
988
728
AvahiIfIndex interface,
989
AvahiProtocol proto,
729
AVAHI_GCC_UNUSED AvahiProtocol protocol,
990
730
AvahiResolverEvent event,
991
731
const char *name,
992
732
const char *type,
997
737
AVAHI_GCC_UNUSED AvahiStringList *txt,
998
738
AVAHI_GCC_UNUSED AvahiLookupResultFlags
999
739
flags,
1000
AVAHI_GCC_UNUSED void* userdata){
740
void* userdata){
741
mandos_context *mc = userdata;
1001
742
assert(r);
1002
743
1003
744
/* Called whenever a service has been resolved successfully or
1004
745
timed out */
1005
746
1006
if(quit_now){
1007
return;
1008
}
1009
1010
747
switch(event){
1011
748
default:
1012
749
case AVAHI_RESOLVER_FAILURE:
1013
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1014
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1015
domain,
1016
avahi_strerror(avahi_server_errno(mc.server)));
750
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
751
" of type '%s' in domain '%s': %s\n", name, type, domain,
752
avahi_strerror(avahi_server_errno(mc->server)));
1017
753
break;
1018
754
1019
755
case AVAHI_RESOLVER_FOUND:
1021
757
char ip[AVAHI_ADDRESS_STR_MAX];
1022
758
avahi_address_snprint(ip, sizeof(ip), address);
1023
759
if(debug){
1024
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1025
PRIdMAX ") on port %" PRIu16 "\n", name,
1026
host_name, ip, (intmax_t)interface, port);
760
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
761
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
762
ip, (intmax_t)interface, port);
1027
763
}
1028
int ret = start_mandos_communication(ip, port, interface,
1029
avahi_proto_to_af(proto));
764
int ret = start_mandos_communication(ip, port, interface, mc);
1030
765
if(ret == 0){
1031
avahi_simple_poll_quit(mc.simple_poll);
1032
} else {
1033
ret = add_server(ip, port, interface,
1034
avahi_proto_to_af(proto));
766
avahi_simple_poll_quit(mc->simple_poll);
1035
767
}
1036
768
}
1037
769
}
1047
779
const char *domain,
1048
780
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1049
781
flags,
1050
AVAHI_GCC_UNUSED void* userdata){
782
void* userdata){
783
mandos_context *mc = userdata;
1051
784
assert(b);
1052
785
1053
786
/* Called whenever a new services becomes available on the LAN or
1054
787
is removed from the LAN */
1055
788
1056
if(quit_now){
1057
return;
1058
}
1059
1060
789
switch(event){
1061
790
default:
1062
791
case AVAHI_BROWSER_FAILURE:
1063
792
1064
fprintf_plus(stderr, "(Avahi browser) %s\n",
1065
avahi_strerror(avahi_server_errno(mc.server)));
1066
avahi_simple_poll_quit(mc.simple_poll);
793
fprintf(stderr, "(Avahi browser) %s\n",
794
avahi_strerror(avahi_server_errno(mc->server)));
795
avahi_simple_poll_quit(mc->simple_poll);
1067
796
return;
1068
797
1069
798
case AVAHI_BROWSER_NEW:
1072
801
the callback function is called the Avahi server will free the
1073
802
resolver for us. */
1074
803
1075
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1076
name, type, domain, protocol, 0,
1077
resolve_callback, NULL) == NULL)
1078
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1079
" %s\n", name,
1080
avahi_strerror(avahi_server_errno(mc.server)));
804
if(!(avahi_s_service_resolver_new(mc->server, interface,
805
protocol, name, type, domain,
806
AVAHI_PROTO_INET6, 0,
807
resolve_callback, mc)))
808
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
809
name, avahi_strerror(avahi_server_errno(mc->server)));
1081
810
break;
1082
811
1083
812
case AVAHI_BROWSER_REMOVE:
1086
815
case AVAHI_BROWSER_ALL_FOR_NOW:
1087
816
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1088
817
if(debug){
1089
fprintf_plus(stderr, "No Mandos server found, still"
1090
" searching...\n");
818
fprintf(stderr, "No Mandos server found, still searching...\n");
1091
819
}
1092
820
break;
1093
821
}
1094
822
}
1095
823
1096
/* Signal handler that stops main loop after SIGTERM */
1097
static void handle_sigterm(int sig){
1098
if(quit_now){
1099
return;
1100
}
1101
quit_now = 1;
1102
signal_received = sig;
1103
int old_errno = errno;
1104
/* set main loop to exit */
1105
if(mc.simple_poll != NULL){
1106
avahi_simple_poll_quit(mc.simple_poll);
1107
}
1108
errno = old_errno;
1109
}
1110
1111
bool get_flags(const char *ifname, struct ifreq *ifr){
1112
int ret;
1113
1114
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1115
if(s < 0){
1116
perror_plus("socket");
1117
return false;
1118
}
1119
strcpy(ifr->ifr_name, ifname);
1120
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1121
if(ret == -1){
1122
if(debug){
1123
perror_plus("ioctl SIOCGIFFLAGS");
1124
}
1125
return false;
1126
}
1127
return true;
1128
}
1129
1130
bool good_flags(const char *ifname, const struct ifreq *ifr){
1131
1132
/* Reject the loopback device */
1133
if(ifr->ifr_flags & IFF_LOOPBACK){
1134
if(debug){
1135
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1136
ifname);
1137
}
1138
return false;
1139
}
1140
/* Accept point-to-point devices only if connect_to is specified */
1141
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1142
if(debug){
1143
fprintf_plus(stderr, "Accepting point-to-point interface"
1144
" \"%s\"\n", ifname);
1145
}
1146
return true;
1147
}
1148
/* Otherwise, reject non-broadcast-capable devices */
1149
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1150
if(debug){
1151
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1152
" \"%s\"\n", ifname);
1153
}
1154
return false;
1155
}
1156
/* Reject non-ARP interfaces (including dummy interfaces) */
1157
if(ifr->ifr_flags & IFF_NOARP){
1158
if(debug){
1159
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1160
ifname);
1161
}
1162
return false;
1163
}
1164
1165
/* Accept this device */
1166
if(debug){
1167
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1168
}
1169
return true;
1170
}
1171
1172
/*
1173
* This function determines if a directory entry in /sys/class/net
1174
* corresponds to an acceptable network device.
1175
* (This function is passed to scandir(3) as a filter function.)
1176
*/
1177
int good_interface(const struct dirent *if_entry){
1178
if(if_entry->d_name[0] == '.'){
1179
return 0;
1180
}
1181
1182
struct ifreq ifr;
1183
if(not get_flags(if_entry->d_name, &ifr)){
1184
if(debug){
1185
fprintf_plus(stderr, "Failed to get flags for interface "
1186
"\"%s\"\n", if_entry->d_name);
1187
}
1188
return 0;
1189
}
1190
1191
if(not good_flags(if_entry->d_name, &ifr)){
1192
return 0;
1193
}
1194
return 1;
1195
}
1196
1197
/*
1198
* This function determines if a directory entry in /sys/class/net
1199
* corresponds to an acceptable network device which is up.
1200
* (This function is passed to scandir(3) as a filter function.)
1201
*/
1202
int up_interface(const struct dirent *if_entry){
1203
if(if_entry->d_name[0] == '.'){
1204
return 0;
1205
}
1206
1207
struct ifreq ifr;
1208
if(not get_flags(if_entry->d_name, &ifr)){
1209
if(debug){
1210
fprintf_plus(stderr, "Failed to get flags for interface "
1211
"\"%s\"\n", if_entry->d_name);
1212
}
1213
return 0;
1214
}
1215
1216
/* Reject down interfaces */
1217
if(not (ifr.ifr_flags & IFF_UP)){
1218
if(debug){
1219
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1220
if_entry->d_name);
1221
}
1222
return 0;
1223
}
1224
1225
/* Reject non-running interfaces */
1226
if(not (ifr.ifr_flags & IFF_RUNNING)){
1227
if(debug){
1228
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1229
if_entry->d_name);
1230
}
1231
return 0;
1232
}
1233
1234
if(not good_flags(if_entry->d_name, &ifr)){
1235
return 0;
1236
}
1237
return 1;
1238
}
1239
1240
int notdotentries(const struct dirent *direntry){
1241
/* Skip "." and ".." */
1242
if(direntry->d_name[0] == '.'
1243
and (direntry->d_name[1] == '\0'
1244
or (direntry->d_name[1] == '.'
1245
and direntry->d_name[2] == '\0'))){
1246
return 0;
1247
}
1248
return 1;
1249
}
1250
1251
/* Is this directory entry a runnable program? */
1252
int runnable_hook(const struct dirent *direntry){
1253
int ret;
1254
size_t sret;
1255
struct stat st;
1256
1257
if((direntry->d_name)[0] == '\0'){
1258
/* Empty name? */
1259
return 0;
1260
}
1261
1262
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1263
"abcdefghijklmnopqrstuvwxyz"
1264
"0123456789"
1265
"_-");
1266
if((direntry->d_name)[sret] != '\0'){
1267
/* Contains non-allowed characters */
1268
if(debug){
1269
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1270
direntry->d_name);
1271
}
1272
return 0;
1273
}
1274
1275
char *fullname = NULL;
1276
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1277
if(ret < 0){
1278
perror_plus("asprintf");
1279
return 0;
1280
}
1281
1282
ret = stat(fullname, &st);
1283
if(ret == -1){
1284
if(debug){
1285
perror_plus("Could not stat hook");
1286
}
1287
return 0;
1288
}
1289
if(not (S_ISREG(st.st_mode))){
1290
/* Not a regular file */
1291
if(debug){
1292
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1293
direntry->d_name);
1294
}
1295
return 0;
1296
}
1297
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1298
/* Not executable */
1299
if(debug){
1300
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1301
direntry->d_name);
1302
}
1303
return 0;
1304
}
1305
if(debug){
1306
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1307
direntry->d_name);
1308
}
1309
return 1;
1310
}
1311
1312
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1313
int ret;
1314
struct timespec now;
1315
struct timespec waited_time;
1316
intmax_t block_time;
1317
1318
while(true){
1319
if(mc.current_server == NULL){
1320
if (debug){
1321
fprintf_plus(stderr, "Wait until first server is found."
1322
" No timeout!\n");
1323
}
1324
ret = avahi_simple_poll_iterate(s, -1);
1325
} else {
1326
if (debug){
1327
fprintf_plus(stderr, "Check current_server if we should run"
1328
" it, or wait\n");
1329
}
1330
/* the current time */
1331
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1332
if(ret == -1){
1333
perror_plus("clock_gettime");
1334
return -1;
1335
}
1336
/* Calculating in ms how long time between now and server
1337
who we visted longest time ago. Now - last seen. */
1338
waited_time.tv_sec = (now.tv_sec
1339
- mc.current_server->last_seen.tv_sec);
1340
waited_time.tv_nsec = (now.tv_nsec
1341
- mc.current_server->last_seen.tv_nsec);
1342
/* total time is 10s/10,000ms.
1343
Converting to s from ms by dividing by 1,000,
1344
and ns to ms by dividing by 1,000,000. */
1345
block_time = ((retry_interval
1346
- ((intmax_t)waited_time.tv_sec * 1000))
1347
- ((intmax_t)waited_time.tv_nsec / 1000000));
1348
1349
if (debug){
1350
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1351
block_time);
1352
}
1353
1354
if(block_time <= 0){
1355
ret = start_mandos_communication(mc.current_server->ip,
1356
mc.current_server->port,
1357
mc.current_server->if_index,
1358
mc.current_server->af);
1359
if(ret == 0){
1360
avahi_simple_poll_quit(mc.simple_poll);
1361
return 0;
1362
}
1363
ret = clock_gettime(CLOCK_MONOTONIC,
1364
&mc.current_server->last_seen);
1365
if(ret == -1){
1366
perror_plus("clock_gettime");
1367
return -1;
1368
}
1369
mc.current_server = mc.current_server->next;
1370
block_time = 0; /* Call avahi to find new Mandos
1371
servers, but don't block */
1372
}
1373
1374
ret = avahi_simple_poll_iterate(s, (int)block_time);
1375
}
1376
if(ret != 0){
1377
if (ret > 0 or errno != EINTR){
1378
return (ret != 1) ? ret : 0;
1379
}
1380
}
1381
}
1382
}
1383
1384
bool run_network_hooks(const char *mode, const char *interface,
1385
const float delay){
1386
struct dirent **direntries;
1387
struct dirent *direntry;
1388
int ret;
1389
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1390
alphasort);
1391
if(numhooks == -1){
1392
perror_plus("scandir");
1393
} else {
1394
int devnull = open("/dev/null", O_RDONLY);
1395
for(int i = 0; i < numhooks; i++){
1396
direntry = direntries[i];
1397
char *fullname = NULL;
1398
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1399
if(ret < 0){
1400
perror_plus("asprintf");
1401
continue;
1402
}
1403
if(debug){
1404
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1405
direntry->d_name);
1406
}
1407
pid_t hook_pid = fork();
1408
if(hook_pid == 0){
1409
/* Child */
1410
/* Raise privileges */
1411
errno = 0;
1412
ret = seteuid(0);
1413
if(ret == -1){
1414
perror_plus("seteuid");
1415
}
1416
/* Raise privileges even more */
1417
errno = 0;
1418
ret = setuid(0);
1419
if(ret == -1){
1420
perror_plus("setuid");
1421
}
1422
/* Set group */
1423
errno = 0;
1424
ret = setgid(0);
1425
if(ret == -1){
1426
perror_plus("setgid");
1427
}
1428
/* Reset supplementary groups */
1429
errno = 0;
1430
ret = setgroups(0, NULL);
1431
if(ret == -1){
1432
perror_plus("setgroups");
1433
}
1434
fprintf_plus(stderr, "Child: getuid() = %d\n", getuid());
1435
fprintf_plus(stderr, "Child: geteuid() = %d\n", geteuid());
1436
dup2(devnull, STDIN_FILENO);
1437
close(devnull);
1438
dup2(STDERR_FILENO, STDOUT_FILENO);
1439
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1440
if(ret == -1){
1441
perror_plus("setenv");
1442
_exit(EX_OSERR);
1443
}
1444
ret = setenv("DEVICE", interface, 1);
1445
if(ret == -1){
1446
perror_plus("setenv");
1447
_exit(EX_OSERR);
1448
}
1449
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1450
if(ret == -1){
1451
perror_plus("setenv");
1452
_exit(EX_OSERR);
1453
}
1454
ret = setenv("MODE", mode, 1);
1455
if(ret == -1){
1456
perror_plus("setenv");
1457
_exit(EX_OSERR);
1458
}
1459
char *delaystring;
1460
ret = asprintf(&delaystring, "%f", delay);
1461
if(ret == -1){
1462
perror_plus("asprintf");
1463
_exit(EX_OSERR);
1464
}
1465
ret = setenv("DELAY", delaystring, 1);
1466
if(ret == -1){
1467
free(delaystring);
1468
perror_plus("setenv");
1469
_exit(EX_OSERR);
1470
}
1471
free(delaystring);
1472
ret = execl(fullname, direntry->d_name, mode, NULL);
1473
perror_plus("execl");
1474
} else {
1475
int status;
1476
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1477
perror_plus("waitpid");
1478
free(fullname);
1479
continue;
1480
}
1481
if(WIFEXITED(status)){
1482
if(WEXITSTATUS(status) != 0){
1483
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1484
" with status %d\n", direntry->d_name,
1485
WEXITSTATUS(status));
1486
free(fullname);
1487
continue;
1488
}
1489
} else if(WIFSIGNALED(status)){
1490
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1491
" signal %d\n", direntry->d_name,
1492
WTERMSIG(status));
1493
free(fullname);
1494
continue;
1495
} else {
1496
fprintf_plus(stderr, "Warning: network hook \"%s\""
1497
" crashed\n", direntry->d_name);
1498
free(fullname);
1499
continue;
1500
}
1501
}
1502
free(fullname);
1503
if(debug){
1504
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1505
direntry->d_name);
1506
}
1507
}
1508
close(devnull);
1509
}
1510
return true;
1511
}
1512
1513
824
int main(int argc, char *argv[]){
1514
825
AvahiSServiceBrowser *sb = NULL;
1515
826
int error;
1516
827
int ret;
1517
828
intmax_t tmpmax;
1518
char *tmp;
829
int numchars;
1519
830
int exitcode = EXIT_SUCCESS;
1520
const char *interface = "";
831
const char *interface = "eth0";
1521
832
struct ifreq network;
1522
int sd = -1;
1523
bool take_down_interface = false;
833
int sd;
1524
834
uid_t uid;
1525
835
gid_t gid;
836
char *connect_to = NULL;
1526
837
char tempdir[] = "/tmp/mandosXXXXXX";
1527
838
bool tempdir_created = false;
1528
839
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1529
840
const char *seckey = PATHDIR "/" SECKEY;
1530
841
const char *pubkey = PATHDIR "/" PUBKEY;
1531
842
843
mandos_context mc = { .simple_poll = NULL, .server = NULL,
844
.dh_bits = 1024, .priority = "SECURE256"
845
":!CTYPE-X.509:+CTYPE-OPENPGP" };
1532
846
bool gnutls_initialized = false;
1533
847
bool gpgme_initialized = false;
1534
float delay = 2.5f;
1535
double retry_interval = 10; /* 10s between trying a server and
1536
retrying the same server again */
1537
1538
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1539
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1540
1541
uid = getuid();
1542
gid = getgid();
1543
1544
/* Lower any group privileges we might have, just to be safe */
1545
errno = 0;
1546
ret = setgid(gid);
1547
if(ret == -1){
1548
perror_plus("setgid");
1549
}
1550
1551
/* Lower user privileges (temporarily) */
1552
errno = 0;
1553
ret = seteuid(uid);
1554
if(ret == -1){
1555
perror_plus("seteuid");
1556
}
1557
1558
if(quit_now){
1559
goto end;
1560
}
848
double delay = 2.5;
1561
849
1562
850
{
1563
851
struct argp_option options[] = {
1569
857
.group = 1 },
1570
858
{ .name = "interface", .key = 'i',
1571
859
.arg = "NAME",
1572
.doc = "Network interface that will be used to search for"
1573
" Mandos servers",
860
.doc = "Interface that will be used to search for Mandos"
861
" servers",
1574
862
.group = 1 },
1575
863
{ .name = "seckey", .key = 's',
1576
864
.arg = "FILE",
1593
881
.arg = "SECONDS",
1594
882
.doc = "Maximum delay to wait for interface startup",
1595
883
.group = 2 },
1596
{ .name = "retry", .key = 132,
1597
.arg = "SECONDS",
1598
.doc = "Retry interval used when denied by the mandos server",
1599
.group = 2 },
1600
{ .name = "network-hook-dir", .key = 133,
1601
.arg = "DIR",
1602
.doc = "Directory where network hooks are located",
1603
.group = 2 },
1604
/*
1605
* These reproduce what we would get without ARGP_NO_HELP
1606
*/
1607
{ .name = "help", .key = '?',
1608
.doc = "Give this help list", .group = -1 },
1609
{ .name = "usage", .key = -3,
1610
.doc = "Give a short usage message", .group = -1 },
1611
{ .name = "version", .key = 'V',
1612
.doc = "Print program version", .group = -1 },
1613
884
{ .name = NULL }
1614
885
};
1615
886
1616
887
error_t parse_opt(int key, char *arg,
1617
888
struct argp_state *state){
1618
errno = 0;
1619
889
switch(key){
1620
890
case 128: /* --debug */
1621
891
debug = true;
1633
903
pubkey = arg;
1634
904
break;
1635
905
case 129: /* --dh-bits */
1636
errno = 0;
1637
tmpmax = strtoimax(arg, &tmp, 10);
1638
if(errno != 0 or tmp == arg or *tmp != '\0'
1639
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1640
argp_error(state, "Bad number of DH bits");
906
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
907
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
908
or arg[numchars] != '\0'){
909
fprintf(stderr, "Bad number of DH bits\n");
910
exit(EXIT_FAILURE);
1641
911
}
1642
912
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1643
913
break;
1645
915
mc.priority = arg;
1646
916
break;
1647
917
case 131: /* --delay */
1648
errno = 0;
1649
delay = strtof(arg, &tmp);
1650
if(errno != 0 or tmp == arg or *tmp != '\0'){
1651
argp_error(state, "Bad delay");
1652
}
1653
case 132: /* --retry */
1654
errno = 0;
1655
retry_interval = strtod(arg, &tmp);
1656
if(errno != 0 or tmp == arg or *tmp != '\0'
1657
or (retry_interval * 1000) > INT_MAX
1658
or retry_interval < 0){
1659
argp_error(state, "Bad retry interval");
1660
}
1661
break;
1662
case 133: /* --network-hook-dir */
1663
hookdir = arg;
1664
break;
1665
/*
1666
* These reproduce what we would get without ARGP_NO_HELP
1667
*/
1668
case '?': /* --help */
1669
argp_state_help(state, state->out_stream,
1670
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1671
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1672
case -3: /* --usage */
1673
argp_state_help(state, state->out_stream,
1674
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1675
case 'V': /* --version */
1676
fprintf_plus(state->out_stream,
1677
"Mandos plugin mandos-client: ");
1678
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1679
exit(argp_err_exit_status);
918
ret = sscanf(arg, "%lf%n", &delay, &numchars);
919
if(ret < 1 or arg[numchars] != '\0'){
920
fprintf(stderr, "Bad delay\n");
921
exit(EXIT_FAILURE);
922
}
923
break;
924
case ARGP_KEY_ARG:
925
argp_usage(state);
926
case ARGP_KEY_END:
1680
927
break;
1681
928
default:
1682
929
return ARGP_ERR_UNKNOWN;
1683
930
}
1684
return errno;
931
return 0;
1685
932
}
1686
933
1687
934
struct argp argp = { .options = options, .parser = parse_opt,
1688
935
.args_doc = "",
1689
936
.doc = "Mandos client -- Get and decrypt"
1690
937
" passwords from a Mandos server" };
1691
ret = argp_parse(&argp, argc, argv,
1692
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1693
switch(ret){
1694
case 0:
1695
break;
1696
case ENOMEM:
1697
default:
1698
errno = ret;
1699
perror_plus("argp_parse");
1700
exitcode = EX_OSERR;
1701
goto end;
1702
case EINVAL:
1703
exitcode = EX_USAGE;
1704
goto end;
1705
}
1706
}
1707
1708
{
1709
/* Work around Debian bug #633582:
1710
<http://bugs.debian.org/633582> */
1711
1712
/* Re-raise priviliges */
1713
errno = 0;
1714
ret = seteuid(0);
1715
if(ret == -1){
1716
perror_plus("seteuid");
1717
} else {
1718
struct stat st;
1719
1720
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1721
int seckey_fd = open(seckey, O_RDONLY);
1722
if(seckey_fd == -1){
1723
perror_plus("open");
1724
} else {
1725
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1726
if(ret == -1){
1727
perror_plus("fstat");
1728
} else {
1729
if(S_ISREG(st.st_mode)
1730
and st.st_uid == 0 and st.st_gid == 0){
1731
ret = fchown(seckey_fd, uid, gid);
1732
if(ret == -1){
1733
perror_plus("fchown");
1734
}
1735
}
1736
}
1737
TEMP_FAILURE_RETRY(close(seckey_fd));
1738
}
1739
}
1740
1741
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1742
int pubkey_fd = open(pubkey, O_RDONLY);
1743
if(pubkey_fd == -1){
1744
perror_plus("open");
1745
} else {
1746
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1747
if(ret == -1){
1748
perror_plus("fstat");
1749
} else {
1750
if(S_ISREG(st.st_mode)
1751
and st.st_uid == 0 and st.st_gid == 0){
1752
ret = fchown(pubkey_fd, uid, gid);
1753
if(ret == -1){
1754
perror_plus("fchown");
1755
}
1756
}
1757
}
1758
TEMP_FAILURE_RETRY(close(pubkey_fd));
1759
}
1760
}
1761
1762
/* Lower privileges */
1763
errno = 0;
1764
ret = seteuid(uid);
1765
if(ret == -1){
1766
perror_plus("seteuid");
1767
}
1768
}
1769
}
1770
1771
/* Run network hooks */
1772
if(not run_network_hooks("start", interface, delay)){
1773
goto end;
1774
}
1775
1776
if(not debug){
1777
avahi_set_log_function(empty_log);
1778
}
1779
1780
if(interface[0] == '\0'){
1781
struct dirent **direntries;
1782
/* First look for interfaces that are up */
1783
ret = scandir(sys_class_net, &direntries, up_interface,
1784
alphasort);
1785
if(ret == 0){
1786
/* No up interfaces, look for any good interfaces */
1787
free(direntries);
1788
ret = scandir(sys_class_net, &direntries, good_interface,
1789
alphasort);
1790
}
1791
if(ret >= 1){
1792
/* Pick the first interface returned */
1793
interface = strdup(direntries[0]->d_name);
1794
if(debug){
1795
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1796
}
1797
if(interface == NULL){
1798
perror_plus("malloc");
1799
free(direntries);
1800
exitcode = EXIT_FAILURE;
1801
goto end;
1802
}
1803
free(direntries);
1804
} else {
1805
free(direntries);
1806
fprintf_plus(stderr, "Could not find a network interface\n");
938
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
939
if(ret == ARGP_ERR_UNKNOWN){
940
fprintf(stderr, "Unknown error while parsing arguments\n");
1807
941
exitcode = EXIT_FAILURE;
1808
942
goto end;
1809
943
}
1810
944
}
1811
945
1812
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1813
from the signal handler */
1814
/* Initialize the pseudo-RNG for Avahi */
1815
srand((unsigned int) time(NULL));
1816
mc.simple_poll = avahi_simple_poll_new();
1817
if(mc.simple_poll == NULL){
1818
fprintf_plus(stderr,
1819
"Avahi: Failed to create simple poll object.\n");
1820
exitcode = EX_UNAVAILABLE;
1821
goto end;
1822
}
1823
1824
sigemptyset(&sigterm_action.sa_mask);
1825
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1826
if(ret == -1){
1827
perror_plus("sigaddset");
1828
exitcode = EX_OSERR;
1829
goto end;
1830
}
1831
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1832
if(ret == -1){
1833
perror_plus("sigaddset");
1834
exitcode = EX_OSERR;
1835
goto end;
1836
}
1837
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1838
if(ret == -1){
1839
perror_plus("sigaddset");
1840
exitcode = EX_OSERR;
1841
goto end;
1842
}
1843
/* Need to check if the handler is SIG_IGN before handling:
1844
| [[info:libc:Initial Signal Actions]] |
1845
| [[info:libc:Basic Signal Handling]] |
1846
*/
1847
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1848
if(ret == -1){
1849
perror_plus("sigaction");
1850
return EX_OSERR;
1851
}
1852
if(old_sigterm_action.sa_handler != SIG_IGN){
1853
ret = sigaction(SIGINT, &sigterm_action, NULL);
1854
if(ret == -1){
1855
perror_plus("sigaction");
1856
exitcode = EX_OSERR;
1857
goto end;
1858
}
1859
}
1860
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1861
if(ret == -1){
1862
perror_plus("sigaction");
1863
return EX_OSERR;
1864
}
1865
if(old_sigterm_action.sa_handler != SIG_IGN){
1866
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1867
if(ret == -1){
1868
perror_plus("sigaction");
1869
exitcode = EX_OSERR;
1870
goto end;
1871
}
1872
}
1873
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1874
if(ret == -1){
1875
perror_plus("sigaction");
1876
return EX_OSERR;
1877
}
1878
if(old_sigterm_action.sa_handler != SIG_IGN){
1879
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1880
if(ret == -1){
1881
perror_plus("sigaction");
1882
exitcode = EX_OSERR;
1883
goto end;
1884
}
1885
}
1886
1887
946
/* If the interface is down, bring it up */
1888
if(strcmp(interface, "none") != 0){
1889
if_index = (AvahiIfIndex) if_nametoindex(interface);
1890
if(if_index == 0){
1891
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1892
exitcode = EX_UNAVAILABLE;
1893
goto end;
1894
}
1895
1896
if(quit_now){
1897
goto end;
1898
}
1899
1900
/* Re-raise priviliges */
1901
errno = 0;
1902
ret = seteuid(0);
1903
if(ret == -1){
1904
perror_plus("seteuid");
1905
}
1906
947
{
1907
948
#ifdef __linux__
1908
949
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1909
messages about the network interface to mess up the prompt */
950
messages to mess up the prompt */
1910
951
ret = klogctl(8, NULL, 5);
1911
bool restore_loglevel = true;
1912
952
if(ret == -1){
1913
restore_loglevel = false;
1914
perror_plus("klogctl");
953
perror("klogctl");
1915
954
}
1916
#endif /* __linux__ */
955
#endif
1917
956
1918
957
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1919
958
if(sd < 0){
1920
perror_plus("socket");
1921
exitcode = EX_OSERR;
959
perror("socket");
960
exitcode = EXIT_FAILURE;
1922
961
#ifdef __linux__
1923
if(restore_loglevel){
1924
ret = klogctl(7, NULL, 0);
1925
if(ret == -1){
1926
perror_plus("klogctl");
1927
}
1928
}
1929
#endif /* __linux__ */
1930
/* Lower privileges */
1931
errno = 0;
1932
ret = seteuid(uid);
962
ret = klogctl(7, NULL, 0);
1933
963
if(ret == -1){
1934
perror_plus("seteuid");
964
perror("klogctl");
1935
965
}
966
#endif
1936
967
goto end;
1937
968
}
1938
969
strcpy(network.ifr_name, interface);
1939
970
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1940
971
if(ret == -1){
1941
perror_plus("ioctl SIOCGIFFLAGS");
972
perror("ioctl SIOCGIFFLAGS");
1942
973
#ifdef __linux__
1943
if(restore_loglevel){
1944
ret = klogctl(7, NULL, 0);
1945
if(ret == -1){
1946
perror_plus("klogctl");
1947
}
1948
}
1949
#endif /* __linux__ */
1950
exitcode = EX_OSERR;
1951
/* Lower privileges */
1952
errno = 0;
1953
ret = seteuid(uid);
974
ret = klogctl(7, NULL, 0);
1954
975
if(ret == -1){
1955
perror_plus("seteuid");
976
perror("klogctl");
1956
977
}
978
#endif
979
exitcode = EXIT_FAILURE;
1957
980
goto end;
1958
981
}
1959
982
if((network.ifr_flags & IFF_UP) == 0){
1960
983
network.ifr_flags |= IFF_UP;
1961
take_down_interface = true;
1962
984
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1963
985
if(ret == -1){
1964
take_down_interface = false;
1965
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1966
exitcode = EX_OSERR;
986
perror("ioctl SIOCSIFFLAGS");
987
exitcode = EXIT_FAILURE;
1967
988
#ifdef __linux__
1968
if(restore_loglevel){
1969
ret = klogctl(7, NULL, 0);
1970
if(ret == -1){
1971
perror_plus("klogctl");
1972
}
1973
}
1974
#endif /* __linux__ */
1975
/* Lower privileges */
1976
errno = 0;
1977
ret = seteuid(uid);
989
ret = klogctl(7, NULL, 0);
1978
990
if(ret == -1){
1979
perror_plus("seteuid");
991
perror("klogctl");
1980
992
}
993
#endif
1981
994
goto end;
1982
995
}
1983
996
}
1984
/* Sleep checking until interface is running.
1985
Check every 0.25s, up to total time of delay */
997
/* sleep checking until interface is running */
1986
998
for(int i=0; i < delay * 4; i++){
1987
999
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1988
1000
if(ret == -1){
1989
perror_plus("ioctl SIOCGIFFLAGS");
1001
perror("ioctl SIOCGIFFLAGS");
1990
1002
} else if(network.ifr_flags & IFF_RUNNING){
1991
1003
break;
1992
1004
}
1993
1005
struct timespec sleeptime = { .tv_nsec = 250000000 };
1994
1006
ret = nanosleep(&sleeptime, NULL);
1995
1007
if(ret == -1 and errno != EINTR){
1996
perror_plus("nanosleep");
1008
perror("nanosleep");
1997
1009
}
1998
1010
}
1999
if(not take_down_interface){
2000
/* We won't need the socket anymore */
2001
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2002
if(ret == -1){
2003
perror_plus("close");
2004
}
1011
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1012
if(ret == -1){
1013
perror("close");
2005
1014
}
2006
1015
#ifdef __linux__
2007
if(restore_loglevel){
2008
/* Restores kernel loglevel to default */
2009
ret = klogctl(7, NULL, 0);
2010
if(ret == -1){
2011
perror_plus("klogctl");
2012
}
2013
}
2014
#endif /* __linux__ */
2015
/* Lower privileges */
2016
errno = 0;
2017
/* Lower privileges */
2018
ret = seteuid(uid);
1016
/* Restores kernel loglevel to default */
1017
ret = klogctl(7, NULL, 0);
2019
1018
if(ret == -1){
2020
perror_plus("seteuid");
1019
perror("klogctl");
2021
1020
}
2022
}
2023
2024
if(quit_now){
2025
goto end;
2026
}
2027
2028
ret = init_gnutls_global(pubkey, seckey);
2029
if(ret == -1){
2030
fprintf_plus(stderr, "init_gnutls_global failed\n");
2031
exitcode = EX_UNAVAILABLE;
1021
#endif
1022
}
1023
1024
uid = getuid();
1025
gid = getgid();
1026
1027
setgid(gid);
1028
if(ret == -1){
1029
perror("setgid");
1030
}
1031
1032
ret = setuid(uid);
1033
if(ret == -1){
1034
perror("setuid");
1035
}
1036
1037
ret = init_gnutls_global(&mc, pubkey, seckey);
1038
if(ret == -1){
1039
fprintf(stderr, "init_gnutls_global failed\n");
1040
exitcode = EXIT_FAILURE;
2032
1041
goto end;
2033
1042
} else {
2034
1043
gnutls_initialized = true;
2035
1044
}
2036
1045
2037
if(quit_now){
2038
goto end;
2039
}
2040
2041
1046
if(mkdtemp(tempdir) == NULL){
2042
perror_plus("mkdtemp");
1047
perror("mkdtemp");
2043
1048
goto end;
2044
1049
}
2045
1050
tempdir_created = true;
2046
1051
2047
if(quit_now){
2048
goto end;
2049
}
2050
2051
if(not init_gpgme(pubkey, seckey, tempdir)){
2052
fprintf_plus(stderr, "init_gpgme failed\n");
2053
exitcode = EX_UNAVAILABLE;
1052
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
1053
fprintf(stderr, "init_gpgme failed\n");
1054
exitcode = EXIT_FAILURE;
2054
1055
goto end;
2055
1056
} else {
2056
1057
gpgme_initialized = true;
2057
1058
}
2058
1059
2059
if(quit_now){
1060
if_index = (AvahiIfIndex) if_nametoindex(interface);
1061
if(if_index == 0){
1062
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1063
exitcode = EXIT_FAILURE;
2060
1064
goto end;
2061
1065
}
2062
1066
2065
1069
/* (Mainly meant for debugging) */
2066
1070
char *address = strrchr(connect_to, ':');
2067
1071
if(address == NULL){
2068
fprintf_plus(stderr, "No colon in address\n");
2069
exitcode = EX_USAGE;
2070
goto end;
2071
}
2072
2073
if(quit_now){
2074
goto end;
2075
}
2076
1072
fprintf(stderr, "No colon in address\n");
1073
exitcode = EXIT_FAILURE;
1074
goto end;
1075
}
2077
1076
uint16_t port;
2078
errno = 0;
2079
tmpmax = strtoimax(address+1, &tmp, 10);
2080
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2081
or tmpmax != (uint16_t)tmpmax){
2082
fprintf_plus(stderr, "Bad port number\n");
2083
exitcode = EX_USAGE;
2084
goto end;
2085
}
2086
2087
if(quit_now){
2088
goto end;
2089
}
2090
1077
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1078
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1079
or address[numchars+1] != '\0'){
1080
fprintf(stderr, "Bad port number\n");
1081
exitcode = EXIT_FAILURE;
1082
goto end;
1083
}
2091
1084
port = (uint16_t)tmpmax;
2092
1085
*address = '\0';
2093
/* Colon in address indicates IPv6 */
2094
int af;
2095
if(strchr(connect_to, ':') != NULL){
2096
af = AF_INET6;
2097
/* Accept [] around IPv6 address - see RFC 5952 */
2098
if(connect_to[0] == '[' and address[-1] == ']')
2099
{
2100
connect_to++;
2101
address[-1] = '\0';
2102
}
2103
} else {
2104
af = AF_INET;
2105
}
2106
1086
address = connect_to;
2107
2108
if(quit_now){
2109
goto end;
2110
}
2111
2112
while(not quit_now){
2113
ret = start_mandos_communication(address, port, if_index, af);
2114
if(quit_now or ret == 0){
2115
break;
2116
}
2117
if(debug){
2118
fprintf_plus(stderr, "Retrying in %d seconds\n",
2119
(int)retry_interval);
2120
}
2121
sleep((int)retry_interval);
2122
}
2123
2124
if (not quit_now){
1087
ret = start_mandos_communication(address, port, if_index, &mc);
1088
if(ret < 0){
1089
exitcode = EXIT_FAILURE;
1090
} else {
2125
1091
exitcode = EXIT_SUCCESS;
2126
1092
}
2127
2128
1093
goto end;
2129
1094
}
2130
1095
2131
if(quit_now){
1096
if(not debug){
1097
avahi_set_log_function(empty_log);
1098
}
1099
1100
/* Initialize the pseudo-RNG for Avahi */
1101
srand((unsigned int) time(NULL));
1102
1103
/* Allocate main Avahi loop object */
1104
mc.simple_poll = avahi_simple_poll_new();
1105
if(mc.simple_poll == NULL){
1106
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1107
exitcode = EXIT_FAILURE;
2132
1108
goto end;
2133
1109
}
2134
1110
2152
1128
2153
1129
/* Check if creating the Avahi server object succeeded */
2154
1130
if(mc.server == NULL){
2155
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2156
avahi_strerror(error));
2157
exitcode = EX_UNAVAILABLE;
2158
goto end;
2159
}
2160
2161
if(quit_now){
1131
fprintf(stderr, "Failed to create Avahi server: %s\n",
1132
avahi_strerror(error));
1133
exitcode = EXIT_FAILURE;
2162
1134
goto end;
2163
1135
}
2164
1136
2165
1137
/* Create the Avahi service browser */
2166
1138
sb = avahi_s_service_browser_new(mc.server, if_index,
2167
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2168
NULL, 0, browse_callback, NULL);
1139
AVAHI_PROTO_INET6, "_mandos._tcp",
1140
NULL, 0, browse_callback, &mc);
2169
1141
if(sb == NULL){
2170
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2171
avahi_strerror(avahi_server_errno(mc.server)));
2172
exitcode = EX_UNAVAILABLE;
2173
goto end;
2174
}
2175
2176
if(quit_now){
1142
fprintf(stderr, "Failed to create service browser: %s\n",
1143
avahi_strerror(avahi_server_errno(mc.server)));
1144
exitcode = EXIT_FAILURE;
2177
1145
goto end;
2178
1146
}
2179
1147
2180
1148
/* Run the main loop */
2181
1149
2182
1150
if(debug){
2183
fprintf_plus(stderr, "Starting Avahi loop search\n");
2184
}
2185
2186
ret = avahi_loop_with_timeout(mc.simple_poll,
2187
(int)(retry_interval * 1000));
2188
if(debug){
2189
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2190
(ret == 0) ? "successfully" : "with error");
2191
}
1151
fprintf(stderr, "Starting Avahi loop search\n");
1152
}
1153
1154
avahi_simple_poll_loop(mc.simple_poll);
2192
1155
2193
1156
end:
2194
1157
2195
1158
if(debug){
2196
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1159
fprintf(stderr, "%s exiting\n", argv[0]);
2197
1160
}
2198
1161
2199
1162
/* Cleanup things */
2216
1179
gpgme_release(mc.ctx);
2217
1180
}
2218
1181
2219
/* Cleans up the circular linked list of Mandos servers the client
2220
has seen */
2221
if(mc.current_server != NULL){
2222
mc.current_server->prev->next = NULL;
2223
while(mc.current_server != NULL){
2224
server *next = mc.current_server->next;
2225
free(mc.current_server);
2226
mc.current_server = next;
2227
}
2228
}
2229
2230
/* Run network hooks */
2231
run_network_hooks("stop", interface, delay);
2232
2233
/* Re-raise priviliges */
2234
{
2235
errno = 0;
2236
ret = seteuid(0);
2237
if(ret == -1){
2238
perror_plus("seteuid");
2239
}
2240
2241
/* Take down the network interface */
2242
if(take_down_interface and geteuid() == 0){
2243
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2244
if(ret == -1){
2245
perror_plus("ioctl SIOCGIFFLAGS");
2246
} else if(network.ifr_flags & IFF_UP){
2247
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2248
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2249
if(ret == -1){
2250
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2251
}
2252
}
2253
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2254
if(ret == -1){
2255
perror_plus("close");
2256
}
2257
}
2258
}
2259
/* Lower privileges permanently */
2260
errno = 0;
2261
ret = setuid(uid);
2262
if(ret == -1){
2263
perror_plus("setuid");
2264
}
2265
2266
/* Removes the GPGME temp directory and all files inside */
1182
/* Removes the temp directory used by GPGME */
2267
1183
if(tempdir_created){
2268
struct dirent **direntries = NULL;
2269
struct dirent *direntry = NULL;
2270
int numentries = scandir(tempdir, &direntries, notdotentries,
2271
alphasort);
2272
if (numentries > 0){
2273
for(int i = 0; i < numentries; i++){
2274
direntry = direntries[i];
1184
DIR *d;
1185
struct dirent *direntry;
1186
d = opendir(tempdir);
1187
if(d == NULL){
1188
if(errno != ENOENT){
1189
perror("opendir");
1190
}
1191
} else {
1192
while(true){
1193
direntry = readdir(d);
1194
if(direntry == NULL){
1195
break;
1196
}
1197
/* Skip "." and ".." */
1198
if(direntry->d_name[0] == '.'
1199
and (direntry->d_name[1] == '\0'
1200
or (direntry->d_name[1] == '.'
1201
and direntry->d_name[2] == '\0'))){
1202
continue;
1203
}
2275
1204
char *fullname = NULL;
2276
1205
ret = asprintf(&fullname, "%s/%s", tempdir,
2277
1206
direntry->d_name);
2278
1207
if(ret < 0){
2279
perror_plus("asprintf");
1208
perror("asprintf");
2280
1209
continue;
2281
1210
}
2282
1211
ret = remove(fullname);
2283
1212
if(ret == -1){
2284
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2285
strerror(errno));
1213
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1214
strerror(errno));
2286
1215
}
2287
1216
free(fullname);
2288
1217
}
2289
}
2290
2291
/* need to clean even if 0 because man page doesn't specify */
2292
free(direntries);
2293
if (numentries == -1){
2294
perror_plus("scandir");
1218
closedir(d);
2295
1219
}
2296
1220
ret = rmdir(tempdir);
2297
1221
if(ret == -1 and errno != ENOENT){
2298
perror_plus("rmdir");
2299
}
2300
}
2301
2302
if(quit_now){
2303
sigemptyset(&old_sigterm_action.sa_mask);
2304
old_sigterm_action.sa_handler = SIG_DFL;
2305
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2306
&old_sigterm_action,
2307
NULL));
2308
if(ret == -1){
2309
perror_plus("sigaction");
2310
}
2311
do {
2312
ret = raise(signal_received);
2313
} while(ret != 0 and errno == EINTR);
2314
if(ret != 0){
2315
perror_plus("raise");
2316
abort();
2317
}
2318
TEMP_FAILURE_RETRY(pause());
1222
perror("rmdir");
1223
}
2319
1224
}
2320
1225
2321
1226
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0