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- Committer: teddy at bsnet
- Date: 2011-11-12 18:04:35 UTC
- mto: (237.15.5 mandos-client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 290.
- Revision ID: teddy@fukt.bsnet.se-20111112180435-kdui7a6o7jfpgz9r
* plugins.d/mandos-client.c (SYNOPSIS, OPTIONS): Document
"--network-hook-dir"
option.
"--network-hook-dir"
option.
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- files removed:
- etc-plugins.d-README
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
1
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
* Mandos client - get and decrypt data from a Mandos server
3
* Mandos-client - get and decrypt data from a Mandos server
4
4
*
5
5
* This program is partly derived from an example program for an Avahi
6
6
* service browser, downloaded from
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
13
14
*
14
15
* This program is free software: you can redistribute it and/or
15
16
* modify it under the terms of the GNU General Public License as
25
26
* along with this program. If not, see
26
27
* <http://www.gnu.org/licenses/>.
27
28
*
28
* Contact the authors at <mandos@fukt.bsnet.se>.
29
* Contact the authors at <mandos@recompile.se>.
29
30
*/
30
31
31
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
32
34
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
33
37
#define _FILE_OFFSET_BITS 64
38
#endif
34
39
35
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
36
41
37
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
38
stdout, ferror() */
43
stdout, ferror(), remove() */
39
44
#include <stdint.h> /* uint16_t, uint32_t */
40
45
#include <stddef.h> /* NULL, size_t, ssize_t */
41
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
42
srand() */
43
#include <stdbool.h> /* bool, true */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
#include <stdbool.h> /* bool, false, true */
44
49
#include <string.h> /* memset(), strcmp(), strlen(),
45
50
strerror(), asprintf(), strcpy() */
46
#include <sys/ioctl.h> /* ioctl */
51
#include <sys/ioctl.h> /* ioctl */
47
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
48
53
sockaddr_in6, PF_INET6,
49
SOCK_STREAM, INET6_ADDRSTRLEN,
50
uid_t, gid_t, open(), opendir(), DIR */
51
#include <sys/stat.h> /* open() */
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
52
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
53
struct in6_addr, inet_pton(),
54
connect() */
58
inet_pton(), connect() */
55
59
#include <fcntl.h> /* open() */
56
#include <dirent.h> /* opendir(), struct dirent, readdir() */
57
#include <inttypes.h> /* PRIu16 */
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
*/
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
58
64
#include <assert.h> /* assert() */
59
#include <errno.h> /* perror(), errno */
60
#include <time.h> /* time() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
61
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
62
69
SIOCSIFFLAGS, if_indextoname(),
63
70
if_nametoindex(), IF_NAMESIZE */
64
#include <netinet/in.h>
71
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
*/
65
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
66
getuid(), getgid(), setuid(),
67
setgid() */
68
#include <arpa/inet.h> /* inet_pton(), htons */
69
#include <iso646.h> /* not, and */
75
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
78
#include <iso646.h> /* not, or, and */
70
79
#include <argp.h> /* struct argp_option, error_t, struct
71
80
argp_state, struct argp,
72
81
argp_parse(), ARGP_KEY_ARG,
73
82
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
91
#ifdef __linux__
92
#include <sys/klog.h> /* klogctl() */
93
#endif /* __linux__ */
74
94
75
95
/* Avahi */
76
96
/* All Avahi types, constants and functions
89
109
gnutls_*
90
110
init_gnutls_session(),
91
111
GNUTLS_* */
92
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
112
#include <gnutls/openpgp.h>
113
/* gnutls_certificate_set_openpgp_key_file(),
93
114
GNUTLS_OPENPGP_FMT_BASE64 */
94
115
95
116
/* GPGME */
101
122
102
123
#define BUFFER_SIZE 256
103
124
104
/*
105
#define PATHDIR "/conf/conf.d/mandos"
106
*/
107
108
125
#define PATHDIR "/conf/conf.d/mandos"
109
126
#define SECKEY "seckey.txt"
110
127
#define PUBKEY "pubkey.txt"
128
#define HOOKDIR "/lib/mandos/network-hooks.d"
111
129
112
130
bool debug = false;
113
131
static const char mandos_protocol_version[] = "1";
114
const char *argp_program_version = "mandos-client 1.0";
115
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
132
const char *argp_program_version = "mandos-client " VERSION;
133
const char *argp_program_bug_address = "<mandos@recompile.se>";
134
static const char sys_class_net[] = "/sys/class/net";
135
char *connect_to = NULL;
136
const char *hookdir = HOOKDIR;
137
138
/* Doubly linked list that need to be circularly linked when used */
139
typedef struct server{
140
const char *ip;
141
uint16_t port;
142
AvahiIfIndex if_index;
143
int af;
144
struct timespec last_seen;
145
struct server *next;
146
struct server *prev;
147
} server;
116
148
117
149
/* Used for passing in values through the Avahi callback functions */
118
150
typedef struct {
123
155
gnutls_dh_params_t dh_params;
124
156
const char *priority;
125
157
gpgme_ctx_t ctx;
158
server *current_server;
126
159
} mandos_context;
127
160
161
/* global context so signal handler can reach it*/
162
mandos_context mc = { .simple_poll = NULL, .server = NULL,
163
.dh_bits = 1024, .priority = "SECURE256"
164
":!CTYPE-X.509:+CTYPE-OPENPGP",
165
.current_server = NULL };
166
167
sig_atomic_t quit_now = 0;
168
int signal_received = 0;
169
170
/* Function to use when printing errors */
171
void perror_plus(const char *print_text){
172
fprintf(stderr, "Mandos plugin %s: ",
173
program_invocation_short_name);
174
perror(print_text);
175
}
176
128
177
/*
129
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
130
* "buffer_capacity" is how much is currently allocated,
178
* Make additional room in "buffer" for at least BUFFER_SIZE more
179
* bytes. "buffer_capacity" is how much is currently allocated,
131
180
* "buffer_length" is how much is already used.
132
181
*/
133
size_t adjustbuffer(char **buffer, size_t buffer_length,
182
size_t incbuffer(char **buffer, size_t buffer_length,
134
183
size_t buffer_capacity){
135
if (buffer_length + BUFFER_SIZE > buffer_capacity){
184
if(buffer_length + BUFFER_SIZE > buffer_capacity){
136
185
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
137
if (buffer == NULL){
186
if(buffer == NULL){
138
187
return 0;
139
188
}
140
189
buffer_capacity += BUFFER_SIZE;
142
191
return buffer_capacity;
143
192
}
144
193
194
/* Add server to set of servers to retry periodically */
195
int add_server(const char *ip, uint16_t port,
196
AvahiIfIndex if_index,
197
int af){
198
int ret;
199
server *new_server = malloc(sizeof(server));
200
if(new_server == NULL){
201
perror_plus("malloc");
202
return -1;
203
}
204
*new_server = (server){ .ip = strdup(ip),
205
.port = port,
206
.if_index = if_index,
207
.af = af };
208
if(new_server->ip == NULL){
209
perror_plus("strdup");
210
return -1;
211
}
212
/* Special case of first server */
213
if (mc.current_server == NULL){
214
new_server->next = new_server;
215
new_server->prev = new_server;
216
mc.current_server = new_server;
217
/* Place the new server last in the list */
218
} else {
219
new_server->next = mc.current_server;
220
new_server->prev = mc.current_server->prev;
221
new_server->prev->next = new_server;
222
mc.current_server->prev = new_server;
223
}
224
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
225
if(ret == -1){
226
perror_plus("clock_gettime");
227
return -1;
228
}
229
return 0;
230
}
231
145
232
/*
146
233
* Initialize GPGME.
147
234
*/
148
static bool init_gpgme(mandos_context *mc, const char *seckey,
235
static bool init_gpgme(const char *seckey,
149
236
const char *pubkey, const char *tempdir){
150
int ret;
151
237
gpgme_error_t rc;
152
238
gpgme_engine_info_t engine_info;
153
239
154
240
155
241
/*
156
* Helper function to insert pub and seckey to the enigne keyring.
242
* Helper function to insert pub and seckey to the engine keyring.
157
243
*/
158
244
bool import_key(const char *filename){
245
int ret;
159
246
int fd;
160
247
gpgme_data_t pgp_data;
161
248
162
fd = TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
249
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
163
250
if(fd == -1){
164
perror("open");
251
perror_plus("open");
165
252
return false;
166
253
}
167
254
168
255
rc = gpgme_data_new_from_fd(&pgp_data, fd);
169
if (rc != GPG_ERR_NO_ERROR){
170
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
171
gpgme_strsource(rc), gpgme_strerror(rc));
172
return false;
173
}
174
175
rc = gpgme_op_import(mc->ctx, pgp_data);
176
if (rc != GPG_ERR_NO_ERROR){
177
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
178
gpgme_strsource(rc), gpgme_strerror(rc));
179
return false;
180
}
181
182
ret = TEMP_FAILURE_RETRY(close(fd));
256
if(rc != GPG_ERR_NO_ERROR){
257
fprintf(stderr, "Mandos plugin mandos-client: "
258
"bad gpgme_data_new_from_fd: %s: %s\n",
259
gpgme_strsource(rc), gpgme_strerror(rc));
260
return false;
261
}
262
263
rc = gpgme_op_import(mc.ctx, pgp_data);
264
if(rc != GPG_ERR_NO_ERROR){
265
fprintf(stderr, "Mandos plugin mandos-client: "
266
"bad gpgme_op_import: %s: %s\n",
267
gpgme_strsource(rc), gpgme_strerror(rc));
268
return false;
269
}
270
271
ret = (int)TEMP_FAILURE_RETRY(close(fd));
183
272
if(ret == -1){
184
perror("close");
273
perror_plus("close");
185
274
}
186
275
gpgme_data_release(pgp_data);
187
276
return true;
188
277
}
189
278
190
if (debug){
191
fprintf(stderr, "Initialize gpgme\n");
279
if(debug){
280
fprintf(stderr, "Mandos plugin mandos-client: "
281
"Initializing GPGME\n");
192
282
}
193
283
194
284
/* Init GPGME */
195
285
gpgme_check_version(NULL);
196
286
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
197
if (rc != GPG_ERR_NO_ERROR){
198
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
287
if(rc != GPG_ERR_NO_ERROR){
288
fprintf(stderr, "Mandos plugin mandos-client: "
289
"bad gpgme_engine_check_version: %s: %s\n",
199
290
gpgme_strsource(rc), gpgme_strerror(rc));
200
291
return false;
201
292
}
202
293
203
/* Set GPGME home directory for the OpenPGP engine only */
204
rc = gpgme_get_engine_info (&engine_info);
205
if (rc != GPG_ERR_NO_ERROR){
206
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
294
/* Set GPGME home directory for the OpenPGP engine only */
295
rc = gpgme_get_engine_info(&engine_info);
296
if(rc != GPG_ERR_NO_ERROR){
297
fprintf(stderr, "Mandos plugin mandos-client: "
298
"bad gpgme_get_engine_info: %s: %s\n",
207
299
gpgme_strsource(rc), gpgme_strerror(rc));
208
300
return false;
209
301
}
216
308
engine_info = engine_info->next;
217
309
}
218
310
if(engine_info == NULL){
219
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
311
fprintf(stderr, "Mandos plugin mandos-client: "
312
"Could not set GPGME home dir to %s\n", tempdir);
220
313
return false;
221
314
}
222
315
223
316
/* Create new GPGME "context" */
224
rc = gpgme_new(&(mc->ctx));
225
if (rc != GPG_ERR_NO_ERROR){
226
fprintf(stderr, "bad gpgme_new: %s: %s\n",
227
gpgme_strsource(rc), gpgme_strerror(rc));
228
return false;
229
}
230
231
if (not import_key(pubkey) or not import_key(seckey)){
232
return false;
233
}
234
235
return true;
317
rc = gpgme_new(&(mc.ctx));
318
if(rc != GPG_ERR_NO_ERROR){
319
fprintf(stderr, "Mandos plugin mandos-client: "
320
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
321
gpgme_strerror(rc));
322
return false;
323
}
324
325
if(not import_key(pubkey) or not import_key(seckey)){
326
return false;
327
}
328
329
return true;
236
330
}
237
331
238
332
/*
239
333
* Decrypt OpenPGP data.
240
334
* Returns -1 on error
241
335
*/
242
static ssize_t pgp_packet_decrypt (const mandos_context *mc,
243
const char *cryptotext,
244
size_t crypto_size,
245
char **plaintext){
336
static ssize_t pgp_packet_decrypt(const char *cryptotext,
337
size_t crypto_size,
338
char **plaintext){
246
339
gpgme_data_t dh_crypto, dh_plain;
247
340
gpgme_error_t rc;
248
341
ssize_t ret;
249
342
size_t plaintext_capacity = 0;
250
343
ssize_t plaintext_length = 0;
251
344
252
if (debug){
253
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
345
if(debug){
346
fprintf(stderr, "Mandos plugin mandos-client: "
347
"Trying to decrypt OpenPGP data\n");
254
348
}
255
349
256
350
/* Create new GPGME data buffer from memory cryptotext */
257
351
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
258
352
0);
259
if (rc != GPG_ERR_NO_ERROR){
260
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
353
if(rc != GPG_ERR_NO_ERROR){
354
fprintf(stderr, "Mandos plugin mandos-client: "
355
"bad gpgme_data_new_from_mem: %s: %s\n",
261
356
gpgme_strsource(rc), gpgme_strerror(rc));
262
357
return -1;
263
358
}
264
359
265
360
/* Create new empty GPGME data buffer for the plaintext */
266
361
rc = gpgme_data_new(&dh_plain);
267
if (rc != GPG_ERR_NO_ERROR){
268
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
362
if(rc != GPG_ERR_NO_ERROR){
363
fprintf(stderr, "Mandos plugin mandos-client: "
364
"bad gpgme_data_new: %s: %s\n",
269
365
gpgme_strsource(rc), gpgme_strerror(rc));
270
366
gpgme_data_release(dh_crypto);
271
367
return -1;
273
369
274
370
/* Decrypt data from the cryptotext data buffer to the plaintext
275
371
data buffer */
276
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
277
if (rc != GPG_ERR_NO_ERROR){
278
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
372
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
373
if(rc != GPG_ERR_NO_ERROR){
374
fprintf(stderr, "Mandos plugin mandos-client: "
375
"bad gpgme_op_decrypt: %s: %s\n",
279
376
gpgme_strsource(rc), gpgme_strerror(rc));
280
377
plaintext_length = -1;
281
if (debug){
378
if(debug){
282
379
gpgme_decrypt_result_t result;
283
result = gpgme_op_decrypt_result(mc->ctx);
284
if (result == NULL){
285
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
380
result = gpgme_op_decrypt_result(mc.ctx);
381
if(result == NULL){
382
fprintf(stderr, "Mandos plugin mandos-client: "
383
"gpgme_op_decrypt_result failed\n");
286
384
} else {
287
fprintf(stderr, "Unsupported algorithm: %s\n",
385
fprintf(stderr, "Mandos plugin mandos-client: "
386
"Unsupported algorithm: %s\n",
288
387
result->unsupported_algorithm);
289
fprintf(stderr, "Wrong key usage: %u\n",
388
fprintf(stderr, "Mandos plugin mandos-client: "
389
"Wrong key usage: %u\n",
290
390
result->wrong_key_usage);
291
391
if(result->file_name != NULL){
292
fprintf(stderr, "File name: %s\n", result->file_name);
392
fprintf(stderr, "Mandos plugin mandos-client: "
393
"File name: %s\n", result->file_name);
293
394
}
294
395
gpgme_recipient_t recipient;
295
396
recipient = result->recipients;
296
if(recipient){
297
while(recipient != NULL){
298
fprintf(stderr, "Public key algorithm: %s\n",
299
gpgme_pubkey_algo_name(recipient->pubkey_algo));
300
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
301
fprintf(stderr, "Secret key available: %s\n",
302
recipient->status == GPG_ERR_NO_SECKEY
303
? "No" : "Yes");
304
recipient = recipient->next;
305
}
397
while(recipient != NULL){
398
fprintf(stderr, "Mandos plugin mandos-client: "
399
"Public key algorithm: %s\n",
400
gpgme_pubkey_algo_name(recipient->pubkey_algo));
401
fprintf(stderr, "Mandos plugin mandos-client: "
402
"Key ID: %s\n", recipient->keyid);
403
fprintf(stderr, "Mandos plugin mandos-client: "
404
"Secret key available: %s\n",
405
recipient->status == GPG_ERR_NO_SECKEY
406
? "No" : "Yes");
407
recipient = recipient->next;
306
408
}
307
409
}
308
410
}
310
412
}
311
413
312
414
if(debug){
313
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
415
fprintf(stderr, "Mandos plugin mandos-client: "
416
"Decryption of OpenPGP data succeeded\n");
314
417
}
315
418
316
419
/* Seek back to the beginning of the GPGME plaintext data buffer */
317
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
318
perror("gpgme_data_seek");
420
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
421
perror_plus("gpgme_data_seek");
319
422
plaintext_length = -1;
320
423
goto decrypt_end;
321
424
}
322
425
323
426
*plaintext = NULL;
324
427
while(true){
325
plaintext_capacity = adjustbuffer(plaintext,
428
plaintext_capacity = incbuffer(plaintext,
326
429
(size_t)plaintext_length,
327
430
plaintext_capacity);
328
if (plaintext_capacity == 0){
329
perror("adjustbuffer");
431
if(plaintext_capacity == 0){
432
perror_plus("incbuffer");
330
433
plaintext_length = -1;
331
434
goto decrypt_end;
332
435
}
334
437
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
335
438
BUFFER_SIZE);
336
439
/* Print the data, if any */
337
if (ret == 0){
440
if(ret == 0){
338
441
/* EOF */
339
442
break;
340
443
}
341
444
if(ret < 0){
342
perror("gpgme_data_read");
445
perror_plus("gpgme_data_read");
343
446
plaintext_length = -1;
344
447
goto decrypt_end;
345
448
}
347
450
}
348
451
349
452
if(debug){
350
fprintf(stderr, "Decrypted password is: ");
453
fprintf(stderr, "Mandos plugin mandos-client: "
454
"Decrypted password is: ");
351
455
for(ssize_t i = 0; i < plaintext_length; i++){
352
456
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
353
457
}
364
468
return plaintext_length;
365
469
}
366
470
367
static const char * safer_gnutls_strerror (int value) {
368
const char *ret = gnutls_strerror (value); /* Spurious warning */
369
if (ret == NULL)
471
static const char * safer_gnutls_strerror(int value){
472
const char *ret = gnutls_strerror(value); /* Spurious warning from
473
-Wunreachable-code */
474
if(ret == NULL)
370
475
ret = "(unknown)";
371
476
return ret;
372
477
}
374
479
/* GnuTLS log function callback */
375
480
static void debuggnutls(__attribute__((unused)) int level,
376
481
const char* string){
377
fprintf(stderr, "GnuTLS: %s", string);
482
fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);
378
483
}
379
484
380
static int init_gnutls_global(mandos_context *mc,
381
const char *pubkeyfilename,
485
static int init_gnutls_global(const char *pubkeyfilename,
382
486
const char *seckeyfilename){
383
487
int ret;
384
488
385
489
if(debug){
386
fprintf(stderr, "Initializing GnuTLS\n");
490
fprintf(stderr, "Mandos plugin mandos-client: "
491
"Initializing GnuTLS\n");
387
492
}
388
493
389
494
ret = gnutls_global_init();
390
if (ret != GNUTLS_E_SUCCESS) {
391
fprintf (stderr, "GnuTLS global_init: %s\n",
392
safer_gnutls_strerror(ret));
495
if(ret != GNUTLS_E_SUCCESS){
496
fprintf(stderr, "Mandos plugin mandos-client: "
497
"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
393
498
return -1;
394
499
}
395
500
396
if (debug){
501
if(debug){
397
502
/* "Use a log level over 10 to enable all debugging options."
398
503
* - GnuTLS manual
399
504
*/
402
507
}
403
508
404
509
/* OpenPGP credentials */
405
gnutls_certificate_allocate_credentials(&mc->cred);
406
if (ret != GNUTLS_E_SUCCESS){
407
fprintf (stderr, "GnuTLS memory error: %s\n", /* Spurious
408
warning */
409
safer_gnutls_strerror(ret));
410
gnutls_global_deinit ();
510
ret = gnutls_certificate_allocate_credentials(&mc.cred);
511
if(ret != GNUTLS_E_SUCCESS){
512
fprintf(stderr, "Mandos plugin mandos-client: "
513
"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
514
gnutls_global_deinit();
411
515
return -1;
412
516
}
413
517
414
518
if(debug){
415
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
519
fprintf(stderr, "Mandos plugin mandos-client: "
520
"Attempting to use OpenPGP public key %s and"
416
521
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
417
522
seckeyfilename);
418
523
}
419
524
420
525
ret = gnutls_certificate_set_openpgp_key_file
421
(mc->cred, pubkeyfilename, seckeyfilename,
526
(mc.cred, pubkeyfilename, seckeyfilename,
422
527
GNUTLS_OPENPGP_FMT_BASE64);
423
if (ret != GNUTLS_E_SUCCESS) {
528
if(ret != GNUTLS_E_SUCCESS){
424
529
fprintf(stderr,
530
"Mandos plugin mandos-client: "
425
531
"Error[%d] while reading the OpenPGP key pair ('%s',"
426
532
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
427
fprintf(stderr, "The GnuTLS error is: %s\n",
428
safer_gnutls_strerror(ret));
533
fprintf(stderr, "Mandos plugin mandos-client: "
534
"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));
429
535
goto globalfail;
430
536
}
431
537
432
538
/* GnuTLS server initialization */
433
ret = gnutls_dh_params_init(&mc->dh_params);
434
if (ret != GNUTLS_E_SUCCESS) {
435
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
436
" %s\n", safer_gnutls_strerror(ret));
539
ret = gnutls_dh_params_init(&mc.dh_params);
540
if(ret != GNUTLS_E_SUCCESS){
541
fprintf(stderr, "Mandos plugin mandos-client: "
542
"Error in GnuTLS DH parameter initialization:"
543
" %s\n", safer_gnutls_strerror(ret));
437
544
goto globalfail;
438
545
}
439
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
440
if (ret != GNUTLS_E_SUCCESS) {
441
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
442
safer_gnutls_strerror(ret));
546
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
547
if(ret != GNUTLS_E_SUCCESS){
548
fprintf(stderr, "Mandos plugin mandos-client: "
549
"Error in GnuTLS prime generation: %s\n",
550
safer_gnutls_strerror(ret));
443
551
goto globalfail;
444
552
}
445
553
446
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
554
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
447
555
448
556
return 0;
449
557
450
558
globalfail:
451
559
452
gnutls_certificate_free_credentials(mc->cred);
560
gnutls_certificate_free_credentials(mc.cred);
453
561
gnutls_global_deinit();
454
gnutls_dh_params_deinit(mc->dh_params);
562
gnutls_dh_params_deinit(mc.dh_params);
455
563
return -1;
456
564
}
457
565
458
static int init_gnutls_session(mandos_context *mc,
459
gnutls_session_t *session){
566
static int init_gnutls_session(gnutls_session_t *session){
460
567
int ret;
461
568
/* GnuTLS session creation */
462
ret = gnutls_init(session, GNUTLS_SERVER);
463
if (ret != GNUTLS_E_SUCCESS){
464
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
569
do {
570
ret = gnutls_init(session, GNUTLS_SERVER);
571
if(quit_now){
572
return -1;
573
}
574
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
575
if(ret != GNUTLS_E_SUCCESS){
576
fprintf(stderr, "Mandos plugin mandos-client: "
577
"Error in GnuTLS session initialization: %s\n",
465
578
safer_gnutls_strerror(ret));
466
579
}
467
580
468
581
{
469
582
const char *err;
470
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
471
if (ret != GNUTLS_E_SUCCESS) {
472
fprintf(stderr, "Syntax error at: %s\n", err);
473
fprintf(stderr, "GnuTLS error: %s\n",
474
safer_gnutls_strerror(ret));
475
gnutls_deinit (*session);
583
do {
584
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
585
if(quit_now){
586
gnutls_deinit(*session);
587
return -1;
588
}
589
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
590
if(ret != GNUTLS_E_SUCCESS){
591
fprintf(stderr, "Mandos plugin mandos-client: "
592
"Syntax error at: %s\n", err);
593
fprintf(stderr, "Mandos plugin mandos-client: "
594
"GnuTLS error: %s\n", safer_gnutls_strerror(ret));
595
gnutls_deinit(*session);
476
596
return -1;
477
597
}
478
598
}
479
599
480
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
481
mc->cred);
482
if (ret != GNUTLS_E_SUCCESS) {
483
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
600
do {
601
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
602
mc.cred);
603
if(quit_now){
604
gnutls_deinit(*session);
605
return -1;
606
}
607
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
608
if(ret != GNUTLS_E_SUCCESS){
609
fprintf(stderr, "Mandos plugin mandos-client: "
610
"Error setting GnuTLS credentials: %s\n",
484
611
safer_gnutls_strerror(ret));
485
gnutls_deinit (*session);
612
gnutls_deinit(*session);
486
613
return -1;
487
614
}
488
615
489
616
/* ignore client certificate if any. */
490
gnutls_certificate_server_set_request (*session,
491
GNUTLS_CERT_IGNORE);
617
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
492
618
493
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
619
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
494
620
495
621
return 0;
496
622
}
502
628
/* Called when a Mandos server is found */
503
629
static int start_mandos_communication(const char *ip, uint16_t port,
504
630
AvahiIfIndex if_index,
505
mandos_context *mc){
506
int ret, tcp_sd;
507
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
631
int af){
632
int ret, tcp_sd = -1;
633
ssize_t sret;
634
union {
635
struct sockaddr_in in;
636
struct sockaddr_in6 in6;
637
} to;
508
638
char *buffer = NULL;
509
char *decrypted_buffer;
639
char *decrypted_buffer = NULL;
510
640
size_t buffer_length = 0;
511
641
size_t buffer_capacity = 0;
512
ssize_t decrypted_buffer_size;
513
642
size_t written;
514
int retval = 0;
515
char interface[IF_NAMESIZE];
643
int retval = -1;
516
644
gnutls_session_t session;
517
518
ret = init_gnutls_session (mc, &session);
519
if (ret != 0){
645
int pf; /* Protocol family */
646
647
errno = 0;
648
649
if(quit_now){
650
errno = EINTR;
651
return -1;
652
}
653
654
switch(af){
655
case AF_INET6:
656
pf = PF_INET6;
657
break;
658
case AF_INET:
659
pf = PF_INET;
660
break;
661
default:
662
fprintf(stderr, "Mandos plugin mandos-client: "
663
"Bad address family: %d\n", af);
664
errno = EINVAL;
665
return -1;
666
}
667
668
ret = init_gnutls_session(&session);
669
if(ret != 0){
520
670
return -1;
521
671
}
522
672
523
673
if(debug){
524
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
674
fprintf(stderr, "Mandos plugin mandos-client: "
675
"Setting up a TCP connection to %s, port %" PRIu16
525
676
"\n", ip, port);
526
677
}
527
678
528
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
529
if(tcp_sd < 0) {
530
perror("socket");
531
return -1;
679
tcp_sd = socket(pf, SOCK_STREAM, 0);
680
if(tcp_sd < 0){
681
int e = errno;
682
perror_plus("socket");
683
errno = e;
684
goto mandos_end;
532
685
}
533
686
534
if(debug){
535
if(if_indextoname((unsigned int)if_index, interface) == NULL){
536
perror("if_indextoname");
537
return -1;
538
}
539
fprintf(stderr, "Binding to interface %s\n", interface);
687
if(quit_now){
688
errno = EINTR;
689
goto mandos_end;
540
690
}
541
691
542
692
memset(&to, 0, sizeof(to));
543
to.in6.sin6_family = AF_INET6;
544
/* It would be nice to have a way to detect if we were passed an
545
IPv4 address here. Now we assume an IPv6 address. */
546
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
547
if (ret < 0 ){
548
perror("inet_pton");
549
return -1;
693
if(af == AF_INET6){
694
to.in6.sin6_family = (sa_family_t)af;
695
ret = inet_pton(af, ip, &to.in6.sin6_addr);
696
} else { /* IPv4 */
697
to.in.sin_family = (sa_family_t)af;
698
ret = inet_pton(af, ip, &to.in.sin_addr);
699
}
700
if(ret < 0 ){
701
int e = errno;
702
perror_plus("inet_pton");
703
errno = e;
704
goto mandos_end;
550
705
}
551
706
if(ret == 0){
552
fprintf(stderr, "Bad address: %s\n", ip);
553
return -1;
554
}
555
to.in6.sin6_port = htons(port); /* Spurious warning */
707
int e = errno;
708
fprintf(stderr, "Mandos plugin mandos-client: "
709
"Bad address: %s\n", ip);
710
errno = e;
711
goto mandos_end;
712
}
713
if(af == AF_INET6){
714
to.in6.sin6_port = htons(port); /* Spurious warnings from
715
-Wconversion and
716
-Wunreachable-code */
717
718
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
719
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
720
-Wunreachable-code*/
721
if(if_index == AVAHI_IF_UNSPEC){
722
fprintf(stderr, "Mandos plugin mandos-client: "
723
"An IPv6 link-local address is incomplete"
724
" without a network interface\n");
725
errno = EINVAL;
726
goto mandos_end;
727
}
728
/* Set the network interface number as scope */
729
to.in6.sin6_scope_id = (uint32_t)if_index;
730
}
731
} else {
732
to.in.sin_port = htons(port); /* Spurious warnings from
733
-Wconversion and
734
-Wunreachable-code */
735
}
556
736
557
to.in6.sin6_scope_id = (uint32_t)if_index;
737
if(quit_now){
738
errno = EINTR;
739
goto mandos_end;
740
}
558
741
559
742
if(debug){
560
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
561
port);
562
char addrstr[INET6_ADDRSTRLEN] = "";
563
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
564
sizeof(addrstr)) == NULL){
565
perror("inet_ntop");
743
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
744
char interface[IF_NAMESIZE];
745
if(if_indextoname((unsigned int)if_index, interface) == NULL){
746
perror_plus("if_indextoname");
747
} else {
748
fprintf(stderr, "Mandos plugin mandos-client: "
749
"Connection to: %s%%%s, port %" PRIu16 "\n",
750
ip, interface, port);
751
}
752
} else {
753
fprintf(stderr, "Mandos plugin mandos-client: "
754
"Connection to: %s, port %" PRIu16 "\n", ip, port);
755
}
756
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
757
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
758
const char *pcret;
759
if(af == AF_INET6){
760
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
761
sizeof(addrstr));
762
} else {
763
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
764
sizeof(addrstr));
765
}
766
if(pcret == NULL){
767
perror_plus("inet_ntop");
566
768
} else {
567
769
if(strcmp(addrstr, ip) != 0){
568
fprintf(stderr, "Canonical address form: %s\n", addrstr);
770
fprintf(stderr, "Mandos plugin mandos-client: "
771
"Canonical address form: %s\n", addrstr);
569
772
}
570
773
}
571
774
}
572
775
573
ret = connect(tcp_sd, &to.in, sizeof(to));
574
if (ret < 0){
575
perror("connect");
576
return -1;
776
if(quit_now){
777
errno = EINTR;
778
goto mandos_end;
779
}
780
781
if(af == AF_INET6){
782
ret = connect(tcp_sd, &to.in6, sizeof(to));
783
} else {
784
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
785
}
786
if(ret < 0){
787
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
788
int e = errno;
789
perror_plus("connect");
790
errno = e;
791
}
792
goto mandos_end;
793
}
794
795
if(quit_now){
796
errno = EINTR;
797
goto mandos_end;
577
798
}
578
799
579
800
const char *out = mandos_protocol_version;
580
801
written = 0;
581
while (true){
802
while(true){
582
803
size_t out_size = strlen(out);
583
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
804
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
584
805
out_size - written));
585
if (ret == -1){
586
perror("write");
587
retval = -1;
806
if(ret == -1){
807
int e = errno;
808
perror_plus("write");
809
errno = e;
588
810
goto mandos_end;
589
811
}
590
812
written += (size_t)ret;
591
813
if(written < out_size){
592
814
continue;
593
815
} else {
594
if (out == mandos_protocol_version){
816
if(out == mandos_protocol_version){
595
817
written = 0;
596
818
out = "\r\n";
597
819
} else {
598
820
break;
599
821
}
600
822
}
823
824
if(quit_now){
825
errno = EINTR;
826
goto mandos_end;
827
}
601
828
}
602
829
603
830
if(debug){
604
fprintf(stderr, "Establishing TLS session with %s\n", ip);
605
}
606
607
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
608
609
do{
610
ret = gnutls_handshake (session);
831
fprintf(stderr, "Mandos plugin mandos-client: "
832
"Establishing TLS session with %s\n", ip);
833
}
834
835
if(quit_now){
836
errno = EINTR;
837
goto mandos_end;
838
}
839
840
/* Spurious warning from -Wint-to-pointer-cast */
841
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
842
843
if(quit_now){
844
errno = EINTR;
845
goto mandos_end;
846
}
847
848
do {
849
ret = gnutls_handshake(session);
850
if(quit_now){
851
errno = EINTR;
852
goto mandos_end;
853
}
611
854
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
612
855
613
if (ret != GNUTLS_E_SUCCESS){
856
if(ret != GNUTLS_E_SUCCESS){
614
857
if(debug){
615
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
616
gnutls_perror (ret);
858
fprintf(stderr, "Mandos plugin mandos-client: "
859
"*** GnuTLS Handshake failed ***\n");
860
gnutls_perror(ret);
617
861
}
618
retval = -1;
862
errno = EPROTO;
619
863
goto mandos_end;
620
864
}
621
865
622
866
/* Read OpenPGP packet that contains the wanted password */
623
867
624
868
if(debug){
625
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
626
ip);
869
fprintf(stderr, "Mandos plugin mandos-client: "
870
"Retrieving OpenPGP encrypted password from %s\n", ip);
627
871
}
628
872
629
873
while(true){
630
buffer_capacity = adjustbuffer(&buffer, buffer_length,
874
875
if(quit_now){
876
errno = EINTR;
877
goto mandos_end;
878
}
879
880
buffer_capacity = incbuffer(&buffer, buffer_length,
631
881
buffer_capacity);
632
if (buffer_capacity == 0){
633
perror("adjustbuffer");
634
retval = -1;
635
goto mandos_end;
636
}
637
638
ret = gnutls_record_recv(session, buffer+buffer_length,
639
BUFFER_SIZE);
640
if (ret == 0){
882
if(buffer_capacity == 0){
883
int e = errno;
884
perror_plus("incbuffer");
885
errno = e;
886
goto mandos_end;
887
}
888
889
if(quit_now){
890
errno = EINTR;
891
goto mandos_end;
892
}
893
894
sret = gnutls_record_recv(session, buffer+buffer_length,
895
BUFFER_SIZE);
896
if(sret == 0){
641
897
break;
642
898
}
643
if (ret < 0){
644
switch(ret){
899
if(sret < 0){
900
switch(sret){
645
901
case GNUTLS_E_INTERRUPTED:
646
902
case GNUTLS_E_AGAIN:
647
903
break;
648
904
case GNUTLS_E_REHANDSHAKE:
649
do{
650
ret = gnutls_handshake (session);
905
do {
906
ret = gnutls_handshake(session);
907
908
if(quit_now){
909
errno = EINTR;
910
goto mandos_end;
911
}
651
912
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
652
if (ret < 0){
653
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
654
gnutls_perror (ret);
655
retval = -1;
913
if(ret < 0){
914
fprintf(stderr, "Mandos plugin mandos-client: "
915
"*** GnuTLS Re-handshake failed ***\n");
916
gnutls_perror(ret);
917
errno = EPROTO;
656
918
goto mandos_end;
657
919
}
658
920
break;
659
921
default:
660
fprintf(stderr, "Unknown error while reading data from"
922
fprintf(stderr, "Mandos plugin mandos-client: "
923
"Unknown error while reading data from"
661
924
" encrypted session with Mandos server\n");
662
retval = -1;
663
gnutls_bye (session, GNUTLS_SHUT_RDWR);
925
gnutls_bye(session, GNUTLS_SHUT_RDWR);
926
errno = EIO;
664
927
goto mandos_end;
665
928
}
666
929
} else {
667
buffer_length += (size_t) ret;
930
buffer_length += (size_t) sret;
668
931
}
669
932
}
670
933
671
934
if(debug){
672
fprintf(stderr, "Closing TLS session\n");
673
}
674
675
gnutls_bye (session, GNUTLS_SHUT_RDWR);
676
677
if (buffer_length > 0){
678
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
935
fprintf(stderr, "Mandos plugin mandos-client: "
936
"Closing TLS session\n");
937
}
938
939
if(quit_now){
940
errno = EINTR;
941
goto mandos_end;
942
}
943
944
do {
945
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
946
if(quit_now){
947
errno = EINTR;
948
goto mandos_end;
949
}
950
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
951
952
if(buffer_length > 0){
953
ssize_t decrypted_buffer_size;
954
decrypted_buffer_size = pgp_packet_decrypt(buffer,
679
955
buffer_length,
680
956
&decrypted_buffer);
681
if (decrypted_buffer_size >= 0){
957
if(decrypted_buffer_size >= 0){
958
682
959
written = 0;
683
960
while(written < (size_t) decrypted_buffer_size){
684
ret = (int)fwrite (decrypted_buffer + written, 1,
685
(size_t)decrypted_buffer_size - written,
686
stdout);
961
if(quit_now){
962
errno = EINTR;
963
goto mandos_end;
964
}
965
966
ret = (int)fwrite(decrypted_buffer + written, 1,
967
(size_t)decrypted_buffer_size - written,
968
stdout);
687
969
if(ret == 0 and ferror(stdout)){
970
int e = errno;
688
971
if(debug){
689
fprintf(stderr, "Error writing encrypted data: %s\n",
972
fprintf(stderr, "Mandos plugin mandos-client: "
973
"Error writing encrypted data: %s\n",
690
974
strerror(errno));
691
975
}
692
retval = -1;
693
break;
976
errno = e;
977
goto mandos_end;
694
978
}
695
979
written += (size_t)ret;
696
980
}
697
free(decrypted_buffer);
698
} else {
699
retval = -1;
981
retval = 0;
700
982
}
701
} else {
702
retval = -1;
703
983
}
704
984
705
985
/* Shutdown procedure */
706
986
707
987
mandos_end:
708
free(buffer);
709
ret = TEMP_FAILURE_RETRY(close(tcp_sd));
710
if(ret == -1){
711
perror("close");
988
{
989
int e = errno;
990
free(decrypted_buffer);
991
free(buffer);
992
if(tcp_sd >= 0){
993
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
994
}
995
if(ret == -1){
996
if(e == 0){
997
e = errno;
998
}
999
perror_plus("close");
1000
}
1001
gnutls_deinit(session);
1002
errno = e;
1003
if(quit_now){
1004
errno = EINTR;
1005
retval = -1;
1006
}
712
1007
}
713
gnutls_deinit (session);
714
1008
return retval;
715
1009
}
716
1010
717
1011
static void resolve_callback(AvahiSServiceResolver *r,
718
1012
AvahiIfIndex interface,
719
AVAHI_GCC_UNUSED AvahiProtocol protocol,
1013
AvahiProtocol proto,
720
1014
AvahiResolverEvent event,
721
1015
const char *name,
722
1016
const char *type,
727
1021
AVAHI_GCC_UNUSED AvahiStringList *txt,
728
1022
AVAHI_GCC_UNUSED AvahiLookupResultFlags
729
1023
flags,
730
void* userdata) {
731
mandos_context *mc = userdata;
1024
AVAHI_GCC_UNUSED void* userdata){
732
1025
assert(r);
733
1026
734
1027
/* Called whenever a service has been resolved successfully or
735
1028
timed out */
736
1029
737
switch (event) {
1030
if(quit_now){
1031
return;
1032
}
1033
1034
switch(event){
738
1035
default:
739
1036
case AVAHI_RESOLVER_FAILURE:
740
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
1037
fprintf(stderr, "Mandos plugin mandos-client: "
1038
"(Avahi Resolver) Failed to resolve service '%s'"
741
1039
" of type '%s' in domain '%s': %s\n", name, type, domain,
742
avahi_strerror(avahi_server_errno(mc->server)));
1040
avahi_strerror(avahi_server_errno(mc.server)));
743
1041
break;
744
1042
745
1043
case AVAHI_RESOLVER_FOUND:
747
1045
char ip[AVAHI_ADDRESS_STR_MAX];
748
1046
avahi_address_snprint(ip, sizeof(ip), address);
749
1047
if(debug){
750
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
751
PRIu16 ") on port %d\n", name, host_name, ip,
752
interface, port);
1048
fprintf(stderr, "Mandos plugin mandos-client: "
1049
"Mandos server \"%s\" found on %s (%s, %"
1050
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1051
ip, (intmax_t)interface, port);
753
1052
}
754
int ret = start_mandos_communication(ip, port, interface, mc);
755
if (ret == 0){
756
avahi_simple_poll_quit(mc->simple_poll);
1053
int ret = start_mandos_communication(ip, port, interface,
1054
avahi_proto_to_af(proto));
1055
if(ret == 0){
1056
avahi_simple_poll_quit(mc.simple_poll);
1057
} else {
1058
ret = add_server(ip, port, interface,
1059
avahi_proto_to_af(proto));
757
1060
}
758
1061
}
759
1062
}
760
1063
avahi_s_service_resolver_free(r);
761
1064
}
762
1065
763
static void browse_callback( AvahiSServiceBrowser *b,
764
AvahiIfIndex interface,
765
AvahiProtocol protocol,
766
AvahiBrowserEvent event,
767
const char *name,
768
const char *type,
769
const char *domain,
770
AVAHI_GCC_UNUSED AvahiLookupResultFlags
771
flags,
772
void* userdata) {
773
mandos_context *mc = userdata;
1066
static void browse_callback(AvahiSServiceBrowser *b,
1067
AvahiIfIndex interface,
1068
AvahiProtocol protocol,
1069
AvahiBrowserEvent event,
1070
const char *name,
1071
const char *type,
1072
const char *domain,
1073
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1074
flags,
1075
AVAHI_GCC_UNUSED void* userdata){
774
1076
assert(b);
775
1077
776
1078
/* Called whenever a new services becomes available on the LAN or
777
1079
is removed from the LAN */
778
1080
779
switch (event) {
1081
if(quit_now){
1082
return;
1083
}
1084
1085
switch(event){
780
1086
default:
781
1087
case AVAHI_BROWSER_FAILURE:
782
1088
783
fprintf(stderr, "(Avahi browser) %s\n",
784
avahi_strerror(avahi_server_errno(mc->server)));
785
avahi_simple_poll_quit(mc->simple_poll);
1089
fprintf(stderr, "Mandos plugin mandos-client: "
1090
"(Avahi browser) %s\n",
1091
avahi_strerror(avahi_server_errno(mc.server)));
1092
avahi_simple_poll_quit(mc.simple_poll);
786
1093
return;
787
1094
788
1095
case AVAHI_BROWSER_NEW:
791
1098
the callback function is called the Avahi server will free the
792
1099
resolver for us. */
793
1100
794
if (!(avahi_s_service_resolver_new(mc->server, interface,
795
protocol, name, type, domain,
796
AVAHI_PROTO_INET6, 0,
797
resolve_callback, mc)))
798
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
799
name, avahi_strerror(avahi_server_errno(mc->server)));
1101
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1102
name, type, domain, protocol, 0,
1103
resolve_callback, NULL) == NULL)
1104
fprintf(stderr, "Mandos plugin mandos-client: "
1105
"Avahi: Failed to resolve service '%s': %s\n",
1106
name, avahi_strerror(avahi_server_errno(mc.server)));
800
1107
break;
801
1108
802
1109
case AVAHI_BROWSER_REMOVE:
805
1112
case AVAHI_BROWSER_ALL_FOR_NOW:
806
1113
case AVAHI_BROWSER_CACHE_EXHAUSTED:
807
1114
if(debug){
808
fprintf(stderr, "No Mandos server found, still searching...\n");
1115
fprintf(stderr, "Mandos plugin mandos-client: "
1116
"No Mandos server found, still searching...\n");
809
1117
}
810
1118
break;
811
1119
}
812
1120
}
813
1121
1122
/* Signal handler that stops main loop after SIGTERM */
1123
static void handle_sigterm(int sig){
1124
if(quit_now){
1125
return;
1126
}
1127
quit_now = 1;
1128
signal_received = sig;
1129
int old_errno = errno;
1130
/* set main loop to exit */
1131
if(mc.simple_poll != NULL){
1132
avahi_simple_poll_quit(mc.simple_poll);
1133
}
1134
errno = old_errno;
1135
}
1136
1137
bool get_flags(const char *ifname, struct ifreq *ifr){
1138
int ret;
1139
1140
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1141
if(s < 0){
1142
perror_plus("socket");
1143
return false;
1144
}
1145
strcpy(ifr->ifr_name, ifname);
1146
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1147
if(ret == -1){
1148
if(debug){
1149
perror_plus("ioctl SIOCGIFFLAGS");
1150
}
1151
return false;
1152
}
1153
return true;
1154
}
1155
1156
bool good_flags(const char *ifname, const struct ifreq *ifr){
1157
1158
/* Reject the loopback device */
1159
if(ifr->ifr_flags & IFF_LOOPBACK){
1160
if(debug){
1161
fprintf(stderr, "Mandos plugin mandos-client: "
1162
"Rejecting loopback interface \"%s\"\n", ifname);
1163
}
1164
return false;
1165
}
1166
/* Accept point-to-point devices only if connect_to is specified */
1167
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1168
if(debug){
1169
fprintf(stderr, "Mandos plugin mandos-client: "
1170
"Accepting point-to-point interface \"%s\"\n", ifname);
1171
}
1172
return true;
1173
}
1174
/* Otherwise, reject non-broadcast-capable devices */
1175
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1176
if(debug){
1177
fprintf(stderr, "Mandos plugin mandos-client: "
1178
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1179
}
1180
return false;
1181
}
1182
/* Reject non-ARP interfaces (including dummy interfaces) */
1183
if(ifr->ifr_flags & IFF_NOARP){
1184
if(debug){
1185
fprintf(stderr, "Mandos plugin mandos-client: "
1186
"Rejecting non-ARP interface \"%s\"\n", ifname);
1187
}
1188
return false;
1189
}
1190
1191
/* Accept this device */
1192
if(debug){
1193
fprintf(stderr, "Mandos plugin mandos-client: "
1194
"Interface \"%s\" is good\n", ifname);
1195
}
1196
return true;
1197
}
1198
1199
/*
1200
* This function determines if a directory entry in /sys/class/net
1201
* corresponds to an acceptable network device.
1202
* (This function is passed to scandir(3) as a filter function.)
1203
*/
1204
int good_interface(const struct dirent *if_entry){
1205
if(if_entry->d_name[0] == '.'){
1206
return 0;
1207
}
1208
1209
struct ifreq ifr;
1210
if(not get_flags(if_entry->d_name, &ifr)){
1211
if(debug){
1212
fprintf(stderr, "Mandos plugin mandos-client: "
1213
"Failed to get flags for interface \"%s\"\n",
1214
if_entry->d_name);
1215
}
1216
return 0;
1217
}
1218
1219
if(not good_flags(if_entry->d_name, &ifr)){
1220
return 0;
1221
}
1222
return 1;
1223
}
1224
1225
/*
1226
* This function determines if a directory entry in /sys/class/net
1227
* corresponds to an acceptable network device which is up.
1228
* (This function is passed to scandir(3) as a filter function.)
1229
*/
1230
int up_interface(const struct dirent *if_entry){
1231
if(if_entry->d_name[0] == '.'){
1232
return 0;
1233
}
1234
1235
struct ifreq ifr;
1236
if(not get_flags(if_entry->d_name, &ifr)){
1237
if(debug){
1238
fprintf(stderr, "Mandos plugin mandos-client: "
1239
"Failed to get flags for interface \"%s\"\n",
1240
if_entry->d_name);
1241
}
1242
return 0;
1243
}
1244
1245
/* Reject down interfaces */
1246
if(not (ifr.ifr_flags & IFF_UP)){
1247
if(debug){
1248
fprintf(stderr, "Mandos plugin mandos-client: "
1249
"Rejecting down interface \"%s\"\n",
1250
if_entry->d_name);
1251
}
1252
return 0;
1253
}
1254
1255
/* Reject non-running interfaces */
1256
if(not (ifr.ifr_flags & IFF_RUNNING)){
1257
if(debug){
1258
fprintf(stderr, "Mandos plugin mandos-client: "
1259
"Rejecting non-running interface \"%s\"\n",
1260
if_entry->d_name);
1261
}
1262
return 0;
1263
}
1264
1265
if(not good_flags(if_entry->d_name, &ifr)){
1266
return 0;
1267
}
1268
return 1;
1269
}
1270
1271
int notdotentries(const struct dirent *direntry){
1272
/* Skip "." and ".." */
1273
if(direntry->d_name[0] == '.'
1274
and (direntry->d_name[1] == '\0'
1275
or (direntry->d_name[1] == '.'
1276
and direntry->d_name[2] == '\0'))){
1277
return 0;
1278
}
1279
return 1;
1280
}
1281
1282
/* Is this directory entry a runnable program? */
1283
int runnable_hook(const struct dirent *direntry){
1284
int ret;
1285
struct stat st;
1286
1287
if((direntry->d_name)[0] == '\0'){
1288
/* Empty name? */
1289
return 0;
1290
}
1291
1292
/* Save pointer to last character */
1293
char *end = strchr(direntry->d_name, '\0')-1;
1294
1295
if(*end == '~'){
1296
/* Backup name~ */
1297
return 0;
1298
}
1299
1300
if(((direntry->d_name)[0] == '#')
1301
and (*end == '#')){
1302
/* Temporary #name# */
1303
return 0;
1304
}
1305
1306
/* XXX more rules here */
1307
1308
char *fullname = NULL;
1309
ret = asprintf(&fullname, "%s/%s", hookdir,
1310
direntry->d_name);
1311
if(ret < 0){
1312
perror_plus("asprintf");
1313
return 0;
1314
}
1315
1316
ret = stat(fullname, &st);
1317
if(ret == -1){
1318
if(debug){
1319
perror_plus("Could not stat plugin");
1320
}
1321
return 0;
1322
}
1323
if(not (S_ISREG(st.st_mode))){
1324
/* Not a regular file */
1325
return 0;
1326
}
1327
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1328
/* Not executable */
1329
return 0;
1330
}
1331
return 1;
1332
}
1333
1334
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1335
int ret;
1336
struct timespec now;
1337
struct timespec waited_time;
1338
intmax_t block_time;
1339
1340
while(true){
1341
if(mc.current_server == NULL){
1342
if (debug){
1343
fprintf(stderr, "Mandos plugin mandos-client: "
1344
"Wait until first server is found. No timeout!\n");
1345
}
1346
ret = avahi_simple_poll_iterate(s, -1);
1347
} else {
1348
if (debug){
1349
fprintf(stderr, "Mandos plugin mandos-client: "
1350
"Check current_server if we should run it,"
1351
" or wait\n");
1352
}
1353
/* the current time */
1354
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1355
if(ret == -1){
1356
perror_plus("clock_gettime");
1357
return -1;
1358
}
1359
/* Calculating in ms how long time between now and server
1360
who we visted longest time ago. Now - last seen. */
1361
waited_time.tv_sec = (now.tv_sec
1362
- mc.current_server->last_seen.tv_sec);
1363
waited_time.tv_nsec = (now.tv_nsec
1364
- mc.current_server->last_seen.tv_nsec);
1365
/* total time is 10s/10,000ms.
1366
Converting to s from ms by dividing by 1,000,
1367
and ns to ms by dividing by 1,000,000. */
1368
block_time = ((retry_interval
1369
- ((intmax_t)waited_time.tv_sec * 1000))
1370
- ((intmax_t)waited_time.tv_nsec / 1000000));
1371
1372
if (debug){
1373
fprintf(stderr, "Mandos plugin mandos-client: "
1374
"Blocking for %" PRIdMAX " ms\n", block_time);
1375
}
1376
1377
if(block_time <= 0){
1378
ret = start_mandos_communication(mc.current_server->ip,
1379
mc.current_server->port,
1380
mc.current_server->if_index,
1381
mc.current_server->af);
1382
if(ret == 0){
1383
avahi_simple_poll_quit(mc.simple_poll);
1384
return 0;
1385
}
1386
ret = clock_gettime(CLOCK_MONOTONIC,
1387
&mc.current_server->last_seen);
1388
if(ret == -1){
1389
perror_plus("clock_gettime");
1390
return -1;
1391
}
1392
mc.current_server = mc.current_server->next;
1393
block_time = 0; /* Call avahi to find new Mandos
1394
servers, but don't block */
1395
}
1396
1397
ret = avahi_simple_poll_iterate(s, (int)block_time);
1398
}
1399
if(ret != 0){
1400
if (ret > 0 or errno != EINTR){
1401
return (ret != 1) ? ret : 0;
1402
}
1403
}
1404
}
1405
}
1406
814
1407
int main(int argc, char *argv[]){
815
AvahiSServiceBrowser *sb = NULL;
816
int error;
817
int ret;
818
int exitcode = EXIT_SUCCESS;
819
const char *interface = "eth0";
820
struct ifreq network;
821
int sd;
822
uid_t uid;
823
gid_t gid;
824
char *connect_to = NULL;
825
char tempdir[] = "/tmp/mandosXXXXXX";
826
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
827
const char *seckey = PATHDIR "/" SECKEY;
828
const char *pubkey = PATHDIR "/" PUBKEY;
829
830
mandos_context mc = { .simple_poll = NULL, .server = NULL,
831
.dh_bits = 1024, .priority = "SECURE256"
832
":!CTYPE-X.509:+CTYPE-OPENPGP" };
833
bool gnutls_initalized = false;
834
bool gpgme_initalized = false;
835
836
{
837
struct argp_option options[] = {
838
{ .name = "debug", .key = 128,
839
.doc = "Debug mode", .group = 3 },
840
{ .name = "connect", .key = 'c',
841
.arg = "ADDRESS:PORT",
842
.doc = "Connect directly to a specific Mandos server",
843
.group = 1 },
844
{ .name = "interface", .key = 'i',
845
.arg = "NAME",
846
.doc = "Interface that will be used to search for Mandos"
847
" servers",
848
.group = 1 },
849
{ .name = "seckey", .key = 's',
850
.arg = "FILE",
851
.doc = "OpenPGP secret key file base name",
852
.group = 1 },
853
{ .name = "pubkey", .key = 'p',
854
.arg = "FILE",
855
.doc = "OpenPGP public key file base name",
856
.group = 2 },
857
{ .name = "dh-bits", .key = 129,
858
.arg = "BITS",
859
.doc = "Bit length of the prime number used in the"
860
" Diffie-Hellman key exchange",
861
.group = 2 },
862
{ .name = "priority", .key = 130,
863
.arg = "STRING",
864
.doc = "GnuTLS priority string for the TLS handshake",
865
.group = 1 },
866
{ .name = NULL }
867
};
868
869
error_t parse_opt (int key, char *arg,
870
struct argp_state *state) {
871
/* Get the INPUT argument from `argp_parse', which we know is
872
a pointer to our plugin list pointer. */
873
switch (key) {
874
case 128: /* --debug */
875
debug = true;
876
break;
877
case 'c': /* --connect */
878
connect_to = arg;
879
break;
880
case 'i': /* --interface */
881
interface = arg;
882
break;
883
case 's': /* --seckey */
884
seckey = arg;
885
break;
886
case 'p': /* --pubkey */
887
pubkey = arg;
888
break;
889
case 129: /* --dh-bits */
890
errno = 0;
891
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
892
if (errno){
893
perror("strtol");
894
exit(EXIT_FAILURE);
895
}
896
break;
897
case 130: /* --priority */
898
mc.priority = arg;
899
break;
900
case ARGP_KEY_ARG:
901
argp_usage (state);
902
case ARGP_KEY_END:
903
break;
904
default:
905
return ARGP_ERR_UNKNOWN;
906
}
907
return 0;
908
}
909
910
struct argp argp = { .options = options, .parser = parse_opt,
911
.args_doc = "",
912
.doc = "Mandos client -- Get and decrypt"
913
" passwords from a Mandos server" };
914
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
915
if (ret == ARGP_ERR_UNKNOWN){
916
fprintf(stderr, "Unknown error while parsing arguments\n");
917
exitcode = EXIT_FAILURE;
918
goto end;
919
}
920
}
921
922
/* If the interface is down, bring it up */
923
{
924
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
925
if(sd < 0) {
926
perror("socket");
927
exitcode = EXIT_FAILURE;
928
goto end;
929
}
930
strcpy(network.ifr_name, interface);
931
ret = ioctl(sd, SIOCGIFFLAGS, &network);
932
if(ret == -1){
933
perror("ioctl SIOCGIFFLAGS");
934
exitcode = EXIT_FAILURE;
935
goto end;
936
}
937
if((network.ifr_flags & IFF_UP) == 0){
938
network.ifr_flags |= IFF_UP;
939
ret = ioctl(sd, SIOCSIFFLAGS, &network);
940
if(ret == -1){
941
perror("ioctl SIOCSIFFLAGS");
942
exitcode = EXIT_FAILURE;
1408
AvahiSServiceBrowser *sb = NULL;
1409
int error;
1410
int ret;
1411
intmax_t tmpmax;
1412
char *tmp;
1413
int exitcode = EXIT_SUCCESS;
1414
const char *interface = "";
1415
struct ifreq network;
1416
int sd = -1;
1417
bool take_down_interface = false;
1418
uid_t uid;
1419
gid_t gid;
1420
char tempdir[] = "/tmp/mandosXXXXXX";
1421
bool tempdir_created = false;
1422
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1423
const char *seckey = PATHDIR "/" SECKEY;
1424
const char *pubkey = PATHDIR "/" PUBKEY;
1425
1426
bool gnutls_initialized = false;
1427
bool gpgme_initialized = false;
1428
float delay = 2.5f;
1429
double retry_interval = 10; /* 10s between trying a server and
1430
retrying the same server again */
1431
1432
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1433
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1434
1435
uid = getuid();
1436
gid = getgid();
1437
1438
/* Lower any group privileges we might have, just to be safe */
1439
errno = 0;
1440
ret = setgid(gid);
1441
if(ret == -1){
1442
perror_plus("setgid");
1443
}
1444
1445
/* Lower user privileges (temporarily) */
1446
errno = 0;
1447
ret = seteuid(uid);
1448
if(ret == -1){
1449
perror_plus("seteuid");
1450
}
1451
1452
if(quit_now){
1453
goto end;
1454
}
1455
1456
{
1457
struct argp_option options[] = {
1458
{ .name = "debug", .key = 128,
1459
.doc = "Debug mode", .group = 3 },
1460
{ .name = "connect", .key = 'c',
1461
.arg = "ADDRESS:PORT",
1462
.doc = "Connect directly to a specific Mandos server",
1463
.group = 1 },
1464
{ .name = "interface", .key = 'i',
1465
.arg = "NAME",
1466
.doc = "Network interface that will be used to search for"
1467
" Mandos servers",
1468
.group = 1 },
1469
{ .name = "seckey", .key = 's',
1470
.arg = "FILE",
1471
.doc = "OpenPGP secret key file base name",
1472
.group = 1 },
1473
{ .name = "pubkey", .key = 'p',
1474
.arg = "FILE",
1475
.doc = "OpenPGP public key file base name",
1476
.group = 2 },
1477
{ .name = "dh-bits", .key = 129,
1478
.arg = "BITS",
1479
.doc = "Bit length of the prime number used in the"
1480
" Diffie-Hellman key exchange",
1481
.group = 2 },
1482
{ .name = "priority", .key = 130,
1483
.arg = "STRING",
1484
.doc = "GnuTLS priority string for the TLS handshake",
1485
.group = 1 },
1486
{ .name = "delay", .key = 131,
1487
.arg = "SECONDS",
1488
.doc = "Maximum delay to wait for interface startup",
1489
.group = 2 },
1490
{ .name = "retry", .key = 132,
1491
.arg = "SECONDS",
1492
.doc = "Retry interval used when denied by the mandos server",
1493
.group = 2 },
1494
{ .name = "network-hook-dir", .key = 133,
1495
.arg = "DIR",
1496
.doc = "Directory where network hooks are located",
1497
.group = 2 },
1498
/*
1499
* These reproduce what we would get without ARGP_NO_HELP
1500
*/
1501
{ .name = "help", .key = '?',
1502
.doc = "Give this help list", .group = -1 },
1503
{ .name = "usage", .key = -3,
1504
.doc = "Give a short usage message", .group = -1 },
1505
{ .name = "version", .key = 'V',
1506
.doc = "Print program version", .group = -1 },
1507
{ .name = NULL }
1508
};
1509
1510
error_t parse_opt(int key, char *arg,
1511
struct argp_state *state){
1512
errno = 0;
1513
switch(key){
1514
case 128: /* --debug */
1515
debug = true;
1516
break;
1517
case 'c': /* --connect */
1518
connect_to = arg;
1519
break;
1520
case 'i': /* --interface */
1521
interface = arg;
1522
break;
1523
case 's': /* --seckey */
1524
seckey = arg;
1525
break;
1526
case 'p': /* --pubkey */
1527
pubkey = arg;
1528
break;
1529
case 129: /* --dh-bits */
1530
errno = 0;
1531
tmpmax = strtoimax(arg, &tmp, 10);
1532
if(errno != 0 or tmp == arg or *tmp != '\0'
1533
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1534
argp_error(state, "Bad number of DH bits");
1535
}
1536
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1537
break;
1538
case 130: /* --priority */
1539
mc.priority = arg;
1540
break;
1541
case 131: /* --delay */
1542
errno = 0;
1543
delay = strtof(arg, &tmp);
1544
if(errno != 0 or tmp == arg or *tmp != '\0'){
1545
argp_error(state, "Bad delay");
1546
}
1547
case 132: /* --retry */
1548
errno = 0;
1549
retry_interval = strtod(arg, &tmp);
1550
if(errno != 0 or tmp == arg or *tmp != '\0'
1551
or (retry_interval * 1000) > INT_MAX
1552
or retry_interval < 0){
1553
argp_error(state, "Bad retry interval");
1554
}
1555
break;
1556
case 133: /* --network-hook-dir */
1557
hookdir = arg;
1558
break;
1559
/*
1560
* These reproduce what we would get without ARGP_NO_HELP
1561
*/
1562
case '?': /* --help */
1563
argp_state_help(state, state->out_stream,
1564
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1565
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1566
case -3: /* --usage */
1567
argp_state_help(state, state->out_stream,
1568
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1569
case 'V': /* --version */
1570
fprintf(state->out_stream, "Mandos plugin mandos-client: ");
1571
fprintf(state->out_stream, "%s\n", argp_program_version);
1572
exit(argp_err_exit_status);
1573
break;
1574
default:
1575
return ARGP_ERR_UNKNOWN;
1576
}
1577
return errno;
1578
}
1579
1580
struct argp argp = { .options = options, .parser = parse_opt,
1581
.args_doc = "",
1582
.doc = "Mandos client -- Get and decrypt"
1583
" passwords from a Mandos server" };
1584
ret = argp_parse(&argp, argc, argv,
1585
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1586
switch(ret){
1587
case 0:
1588
break;
1589
case ENOMEM:
1590
default:
1591
errno = ret;
1592
perror_plus("argp_parse");
1593
exitcode = EX_OSERR;
1594
goto end;
1595
case EINVAL:
1596
exitcode = EX_USAGE;
1597
goto end;
1598
}
1599
}
1600
1601
{
1602
/* Work around Debian bug #633582:
1603
<http://bugs.debian.org/633582> */
1604
struct stat st;
1605
1606
/* Re-raise priviliges */
1607
errno = 0;
1608
ret = seteuid(0);
1609
if(ret == -1){
1610
perror_plus("seteuid");
1611
}
1612
1613
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1614
int seckey_fd = open(seckey, O_RDONLY);
1615
if(seckey_fd == -1){
1616
perror_plus("open");
1617
} else {
1618
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1619
if(ret == -1){
1620
perror_plus("fstat");
1621
} else {
1622
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1623
ret = fchown(seckey_fd, uid, gid);
1624
if(ret == -1){
1625
perror_plus("fchown");
1626
}
1627
}
1628
}
1629
TEMP_FAILURE_RETRY(close(seckey_fd));
1630
}
1631
}
1632
1633
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1634
int pubkey_fd = open(pubkey, O_RDONLY);
1635
if(pubkey_fd == -1){
1636
perror_plus("open");
1637
} else {
1638
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1639
if(ret == -1){
1640
perror_plus("fstat");
1641
} else {
1642
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1643
ret = fchown(pubkey_fd, uid, gid);
1644
if(ret == -1){
1645
perror_plus("fchown");
1646
}
1647
}
1648
}
1649
TEMP_FAILURE_RETRY(close(pubkey_fd));
1650
}
1651
}
1652
1653
/* Lower privileges */
1654
errno = 0;
1655
ret = seteuid(uid);
1656
if(ret == -1){
1657
perror_plus("seteuid");
1658
}
1659
}
1660
1661
/* Find network hooks and run them */
1662
{
1663
struct dirent **direntries;
1664
struct dirent *direntry;
1665
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1666
alphasort);
1667
if(numhooks == -1){
1668
perror_plus("scandir");
1669
} else {
1670
int devnull = open("/dev/null", O_RDONLY);
1671
for(int i = 0; i < numhooks; i++){
1672
direntry = direntries[0];
1673
char *fullname = NULL;
1674
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1675
if(ret < 0){
1676
perror_plus("asprintf");
1677
continue;
1678
}
1679
pid_t hook_pid = fork();
1680
if(hook_pid == 0){
1681
/* Child */
1682
dup2(devnull, STDIN_FILENO);
1683
close(devnull);
1684
dup2(STDERR_FILENO, STDOUT_FILENO);
1685
ret = setenv("DEVICE", interface, 1);
1686
if(ret == -1){
1687
perror_plus("setenv");
1688
exit(1);
1689
}
1690
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1691
if(ret == -1){
1692
perror_plus("setenv");
1693
exit(1);
1694
}
1695
ret = setenv("MODE", "start", 1);
1696
if(ret == -1){
1697
perror_plus("setenv");
1698
exit(1);
1699
}
1700
char *delaystring;
1701
ret = asprintf(&delaystring, "%f", delay);
1702
if(ret == -1){
1703
perror_plus("asprintf");
1704
exit(1);
1705
}
1706
ret = setenv("DELAY", delaystring, 1);
1707
if(ret == -1){
1708
free(delaystring);
1709
perror_plus("setenv");
1710
exit(1);
1711
}
1712
free(delaystring);
1713
ret = execl(fullname, direntry->d_name, "start", NULL);
1714
perror_plus("execl");
1715
} else {
1716
int status;
1717
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1718
perror_plus("waitpid");
1719
free(fullname);
1720
continue;
1721
}
1722
if(WIFEXITED(status)){
1723
if(WEXITSTATUS(status) != 0){
1724
fprintf(stderr, "Mandos plugin mandos-client: "
1725
"Warning: network hook \"%s\" exited"
1726
" with status %d\n", direntry->d_name,
1727
WEXITSTATUS(status));
1728
free(fullname);
1729
continue;
1730
}
1731
} else if(WIFSIGNALED(status)){
1732
fprintf(stderr, "Mandos plugin mandos-client: "
1733
"Warning: network hook \"%s\" died by"
1734
" signal %d\n", direntry->d_name,
1735
WTERMSIG(status));
1736
free(fullname);
1737
continue;
1738
} else {
1739
fprintf(stderr, "Mandos plugin mandos-client: "
1740
"Warning: network hook \"%s\" crashed\n",
1741
direntry->d_name);
1742
free(fullname);
1743
continue;
1744
}
1745
}
1746
free(fullname);
1747
if(quit_now){
943
1748
goto end;
944
1749
}
945
1750
}
946
ret = TEMP_FAILURE_RETRY(close(sd));
947
if(ret == -1){
948
perror("close");
949
}
950
}
951
952
uid = getuid();
953
gid = getgid();
954
955
ret = setuid(uid);
956
if (ret == -1){
957
perror("setuid");
958
}
959
960
setgid(gid);
961
if (ret == -1){
962
perror("setgid");
963
}
964
965
ret = init_gnutls_global(&mc, pubkey, seckey);
966
if (ret == -1){
967
fprintf(stderr, "init_gnutls_global failed\n");
968
exitcode = EXIT_FAILURE;
969
goto end;
970
} else {
971
gnutls_initalized = true;
972
}
973
974
if(mkdtemp(tempdir) == NULL){
975
perror("mkdtemp");
976
tempdir[0] = '\0';
977
goto end;
978
}
979
980
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
981
fprintf(stderr, "gpgme_initalized failed\n");
982
exitcode = EXIT_FAILURE;
983
goto end;
984
} else {
985
gpgme_initalized = true;
986
}
987
1751
close(devnull);
1752
}
1753
}
1754
1755
if(not debug){
1756
avahi_set_log_function(empty_log);
1757
}
1758
1759
if(interface[0] == '\0'){
1760
struct dirent **direntries;
1761
/* First look for interfaces that are up */
1762
ret = scandir(sys_class_net, &direntries, up_interface,
1763
alphasort);
1764
if(ret == 0){
1765
/* No up interfaces, look for any good interfaces */
1766
free(direntries);
1767
ret = scandir(sys_class_net, &direntries, good_interface,
1768
alphasort);
1769
}
1770
if(ret >= 1){
1771
/* Pick the first interface returned */
1772
interface = strdup(direntries[0]->d_name);
1773
if(debug){
1774
fprintf(stderr, "Mandos plugin mandos-client: "
1775
"Using interface \"%s\"\n", interface);
1776
}
1777
if(interface == NULL){
1778
perror_plus("malloc");
1779
free(direntries);
1780
exitcode = EXIT_FAILURE;
1781
goto end;
1782
}
1783
free(direntries);
1784
} else {
1785
free(direntries);
1786
fprintf(stderr, "Mandos plugin mandos-client: "
1787
"Could not find a network interface\n");
1788
exitcode = EXIT_FAILURE;
1789
goto end;
1790
}
1791
}
1792
1793
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1794
from the signal handler */
1795
/* Initialize the pseudo-RNG for Avahi */
1796
srand((unsigned int) time(NULL));
1797
mc.simple_poll = avahi_simple_poll_new();
1798
if(mc.simple_poll == NULL){
1799
fprintf(stderr, "Mandos plugin mandos-client: "
1800
"Avahi: Failed to create simple poll object.\n");
1801
exitcode = EX_UNAVAILABLE;
1802
goto end;
1803
}
1804
1805
sigemptyset(&sigterm_action.sa_mask);
1806
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1807
if(ret == -1){
1808
perror_plus("sigaddset");
1809
exitcode = EX_OSERR;
1810
goto end;
1811
}
1812
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1813
if(ret == -1){
1814
perror_plus("sigaddset");
1815
exitcode = EX_OSERR;
1816
goto end;
1817
}
1818
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1819
if(ret == -1){
1820
perror_plus("sigaddset");
1821
exitcode = EX_OSERR;
1822
goto end;
1823
}
1824
/* Need to check if the handler is SIG_IGN before handling:
1825
| [[info:libc:Initial Signal Actions]] |
1826
| [[info:libc:Basic Signal Handling]] |
1827
*/
1828
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1829
if(ret == -1){
1830
perror_plus("sigaction");
1831
return EX_OSERR;
1832
}
1833
if(old_sigterm_action.sa_handler != SIG_IGN){
1834
ret = sigaction(SIGINT, &sigterm_action, NULL);
1835
if(ret == -1){
1836
perror_plus("sigaction");
1837
exitcode = EX_OSERR;
1838
goto end;
1839
}
1840
}
1841
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1842
if(ret == -1){
1843
perror_plus("sigaction");
1844
return EX_OSERR;
1845
}
1846
if(old_sigterm_action.sa_handler != SIG_IGN){
1847
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1848
if(ret == -1){
1849
perror_plus("sigaction");
1850
exitcode = EX_OSERR;
1851
goto end;
1852
}
1853
}
1854
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1855
if(ret == -1){
1856
perror_plus("sigaction");
1857
return EX_OSERR;
1858
}
1859
if(old_sigterm_action.sa_handler != SIG_IGN){
1860
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1861
if(ret == -1){
1862
perror_plus("sigaction");
1863
exitcode = EX_OSERR;
1864
goto end;
1865
}
1866
}
1867
1868
/* If the interface is down, bring it up */
1869
if(strcmp(interface, "none") != 0){
988
1870
if_index = (AvahiIfIndex) if_nametoindex(interface);
989
1871
if(if_index == 0){
990
fprintf(stderr, "No such interface: \"%s\"\n", interface);
991
exit(EXIT_FAILURE);
992
}
993
994
if(connect_to != NULL){
995
/* Connect directly, do not use Zeroconf */
996
/* (Mainly meant for debugging) */
997
char *address = strrchr(connect_to, ':');
998
if(address == NULL){
999
fprintf(stderr, "No colon in address\n");
1000
exitcode = EXIT_FAILURE;
1001
goto end;
1002
}
1003
errno = 0;
1004
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
1005
if(errno){
1006
perror("Bad port number");
1007
exitcode = EXIT_FAILURE;
1008
goto end;
1009
}
1010
*address = '\0';
1011
address = connect_to;
1012
ret = start_mandos_communication(address, port, if_index, &mc);
1013
if(ret < 0){
1014
exitcode = EXIT_FAILURE;
1015
} else {
1016
exitcode = EXIT_SUCCESS;
1017
}
1018
goto end;
1019
}
1020
1021
if (not debug){
1022
avahi_set_log_function(empty_log);
1023
}
1024
1025
/* Initialize the pseudo-RNG for Avahi */
1026
srand((unsigned int) time(NULL));
1027
1028
/* Allocate main Avahi loop object */
1029
mc.simple_poll = avahi_simple_poll_new();
1030
if (mc.simple_poll == NULL) {
1031
fprintf(stderr, "Avahi: Failed to create simple poll"
1032
" object.\n");
1033
exitcode = EXIT_FAILURE;
1034
goto end;
1035
}
1036
1037
{
1038
AvahiServerConfig config;
1039
/* Do not publish any local Zeroconf records */
1040
avahi_server_config_init(&config);
1041
config.publish_hinfo = 0;
1042
config.publish_addresses = 0;
1043
config.publish_workstation = 0;
1044
config.publish_domain = 0;
1045
1046
/* Allocate a new server */
1047
mc.server = avahi_server_new(avahi_simple_poll_get
1048
(mc.simple_poll), &config, NULL,
1049
NULL, &error);
1050
1051
/* Free the Avahi configuration data */
1052
avahi_server_config_free(&config);
1053
}
1054
1055
/* Check if creating the Avahi server object succeeded */
1056
if (mc.server == NULL) {
1057
fprintf(stderr, "Failed to create Avahi server: %s\n",
1058
avahi_strerror(error));
1059
exitcode = EXIT_FAILURE;
1060
goto end;
1061
}
1062
1063
/* Create the Avahi service browser */
1064
sb = avahi_s_service_browser_new(mc.server, if_index,
1065
AVAHI_PROTO_INET6,
1066
"_mandos._tcp", NULL, 0,
1067
browse_callback, &mc);
1068
if (sb == NULL) {
1069
fprintf(stderr, "Failed to create service browser: %s\n",
1070
avahi_strerror(avahi_server_errno(mc.server)));
1071
exitcode = EXIT_FAILURE;
1072
goto end;
1073
}
1074
1075
/* Run the main loop */
1076
1077
if (debug){
1078
fprintf(stderr, "Starting Avahi loop search\n");
1079
}
1080
1081
avahi_simple_poll_loop(mc.simple_poll);
1082
1872
fprintf(stderr, "Mandos plugin mandos-client: "
1873
"No such interface: \"%s\"\n", interface);
1874
exitcode = EX_UNAVAILABLE;
1875
goto end;
1876
}
1877
1878
if(quit_now){
1879
goto end;
1880
}
1881
1882
/* Re-raise priviliges */
1883
errno = 0;
1884
ret = seteuid(0);
1885
if(ret == -1){
1886
perror_plus("seteuid");
1887
}
1888
1889
#ifdef __linux__
1890
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1891
messages about the network interface to mess up the prompt */
1892
ret = klogctl(8, NULL, 5);
1893
bool restore_loglevel = true;
1894
if(ret == -1){
1895
restore_loglevel = false;
1896
perror_plus("klogctl");
1897
}
1898
#endif /* __linux__ */
1899
1900
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1901
if(sd < 0){
1902
perror_plus("socket");
1903
exitcode = EX_OSERR;
1904
#ifdef __linux__
1905
if(restore_loglevel){
1906
ret = klogctl(7, NULL, 0);
1907
if(ret == -1){
1908
perror_plus("klogctl");
1909
}
1910
}
1911
#endif /* __linux__ */
1912
/* Lower privileges */
1913
errno = 0;
1914
ret = seteuid(uid);
1915
if(ret == -1){
1916
perror_plus("seteuid");
1917
}
1918
goto end;
1919
}
1920
strcpy(network.ifr_name, interface);
1921
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1922
if(ret == -1){
1923
perror_plus("ioctl SIOCGIFFLAGS");
1924
#ifdef __linux__
1925
if(restore_loglevel){
1926
ret = klogctl(7, NULL, 0);
1927
if(ret == -1){
1928
perror_plus("klogctl");
1929
}
1930
}
1931
#endif /* __linux__ */
1932
exitcode = EX_OSERR;
1933
/* Lower privileges */
1934
errno = 0;
1935
ret = seteuid(uid);
1936
if(ret == -1){
1937
perror_plus("seteuid");
1938
}
1939
goto end;
1940
}
1941
if((network.ifr_flags & IFF_UP) == 0){
1942
network.ifr_flags |= IFF_UP;
1943
take_down_interface = true;
1944
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1945
if(ret == -1){
1946
take_down_interface = false;
1947
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1948
exitcode = EX_OSERR;
1949
#ifdef __linux__
1950
if(restore_loglevel){
1951
ret = klogctl(7, NULL, 0);
1952
if(ret == -1){
1953
perror_plus("klogctl");
1954
}
1955
}
1956
#endif /* __linux__ */
1957
/* Lower privileges */
1958
errno = 0;
1959
ret = seteuid(uid);
1960
if(ret == -1){
1961
perror_plus("seteuid");
1962
}
1963
goto end;
1964
}
1965
}
1966
/* Sleep checking until interface is running.
1967
Check every 0.25s, up to total time of delay */
1968
for(int i=0; i < delay * 4; i++){
1969
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1970
if(ret == -1){
1971
perror_plus("ioctl SIOCGIFFLAGS");
1972
} else if(network.ifr_flags & IFF_RUNNING){
1973
break;
1974
}
1975
struct timespec sleeptime = { .tv_nsec = 250000000 };
1976
ret = nanosleep(&sleeptime, NULL);
1977
if(ret == -1 and errno != EINTR){
1978
perror_plus("nanosleep");
1979
}
1980
}
1981
if(not take_down_interface){
1982
/* We won't need the socket anymore */
1983
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1984
if(ret == -1){
1985
perror_plus("close");
1986
}
1987
}
1988
#ifdef __linux__
1989
if(restore_loglevel){
1990
/* Restores kernel loglevel to default */
1991
ret = klogctl(7, NULL, 0);
1992
if(ret == -1){
1993
perror_plus("klogctl");
1994
}
1995
}
1996
#endif /* __linux__ */
1997
/* Lower privileges */
1998
errno = 0;
1999
if(take_down_interface){
2000
/* Lower privileges */
2001
ret = seteuid(uid);
2002
if(ret == -1){
2003
perror_plus("seteuid");
2004
}
2005
} else {
2006
/* Lower privileges permanently */
2007
ret = setuid(uid);
2008
if(ret == -1){
2009
perror_plus("setuid");
2010
}
2011
}
2012
}
2013
2014
if(quit_now){
2015
goto end;
2016
}
2017
2018
ret = init_gnutls_global(pubkey, seckey);
2019
if(ret == -1){
2020
fprintf(stderr, "Mandos plugin mandos-client: "
2021
"init_gnutls_global failed\n");
2022
exitcode = EX_UNAVAILABLE;
2023
goto end;
2024
} else {
2025
gnutls_initialized = true;
2026
}
2027
2028
if(quit_now){
2029
goto end;
2030
}
2031
2032
if(mkdtemp(tempdir) == NULL){
2033
perror_plus("mkdtemp");
2034
goto end;
2035
}
2036
tempdir_created = true;
2037
2038
if(quit_now){
2039
goto end;
2040
}
2041
2042
if(not init_gpgme(pubkey, seckey, tempdir)){
2043
fprintf(stderr, "Mandos plugin mandos-client: "
2044
"init_gpgme failed\n");
2045
exitcode = EX_UNAVAILABLE;
2046
goto end;
2047
} else {
2048
gpgme_initialized = true;
2049
}
2050
2051
if(quit_now){
2052
goto end;
2053
}
2054
2055
if(connect_to != NULL){
2056
/* Connect directly, do not use Zeroconf */
2057
/* (Mainly meant for debugging) */
2058
char *address = strrchr(connect_to, ':');
2059
if(address == NULL){
2060
fprintf(stderr, "Mandos plugin mandos-client: "
2061
"No colon in address\n");
2062
exitcode = EX_USAGE;
2063
goto end;
2064
}
2065
2066
if(quit_now){
2067
goto end;
2068
}
2069
2070
uint16_t port;
2071
errno = 0;
2072
tmpmax = strtoimax(address+1, &tmp, 10);
2073
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2074
or tmpmax != (uint16_t)tmpmax){
2075
fprintf(stderr, "Mandos plugin mandos-client: "
2076
"Bad port number\n");
2077
exitcode = EX_USAGE;
2078
goto end;
2079
}
2080
2081
if(quit_now){
2082
goto end;
2083
}
2084
2085
port = (uint16_t)tmpmax;
2086
*address = '\0';
2087
/* Colon in address indicates IPv6 */
2088
int af;
2089
if(strchr(connect_to, ':') != NULL){
2090
af = AF_INET6;
2091
/* Accept [] around IPv6 address - see RFC 5952 */
2092
if(connect_to[0] == '[' and address[-1] == ']')
2093
{
2094
connect_to++;
2095
address[-1] = '\0';
2096
}
2097
} else {
2098
af = AF_INET;
2099
}
2100
address = connect_to;
2101
2102
if(quit_now){
2103
goto end;
2104
}
2105
2106
while(not quit_now){
2107
ret = start_mandos_communication(address, port, if_index, af);
2108
if(quit_now or ret == 0){
2109
break;
2110
}
2111
if(debug){
2112
fprintf(stderr, "Mandos plugin mandos-client: "
2113
"Retrying in %d seconds\n", (int)retry_interval);
2114
}
2115
sleep((int)retry_interval);
2116
}
2117
2118
if (not quit_now){
2119
exitcode = EXIT_SUCCESS;
2120
}
2121
2122
goto end;
2123
}
2124
2125
if(quit_now){
2126
goto end;
2127
}
2128
2129
{
2130
AvahiServerConfig config;
2131
/* Do not publish any local Zeroconf records */
2132
avahi_server_config_init(&config);
2133
config.publish_hinfo = 0;
2134
config.publish_addresses = 0;
2135
config.publish_workstation = 0;
2136
config.publish_domain = 0;
2137
2138
/* Allocate a new server */
2139
mc.server = avahi_server_new(avahi_simple_poll_get
2140
(mc.simple_poll), &config, NULL,
2141
NULL, &error);
2142
2143
/* Free the Avahi configuration data */
2144
avahi_server_config_free(&config);
2145
}
2146
2147
/* Check if creating the Avahi server object succeeded */
2148
if(mc.server == NULL){
2149
fprintf(stderr, "Mandos plugin mandos-client: "
2150
"Failed to create Avahi server: %s\n",
2151
avahi_strerror(error));
2152
exitcode = EX_UNAVAILABLE;
2153
goto end;
2154
}
2155
2156
if(quit_now){
2157
goto end;
2158
}
2159
2160
/* Create the Avahi service browser */
2161
sb = avahi_s_service_browser_new(mc.server, if_index,
2162
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2163
NULL, 0, browse_callback, NULL);
2164
if(sb == NULL){
2165
fprintf(stderr, "Mandos plugin mandos-client: "
2166
"Failed to create service browser: %s\n",
2167
avahi_strerror(avahi_server_errno(mc.server)));
2168
exitcode = EX_UNAVAILABLE;
2169
goto end;
2170
}
2171
2172
if(quit_now){
2173
goto end;
2174
}
2175
2176
/* Run the main loop */
2177
2178
if(debug){
2179
fprintf(stderr, "Mandos plugin mandos-client: "
2180
"Starting Avahi loop search\n");
2181
}
2182
2183
ret = avahi_loop_with_timeout(mc.simple_poll,
2184
(int)(retry_interval * 1000));
2185
if(debug){
2186
fprintf(stderr, "Mandos plugin mandos-client: "
2187
"avahi_loop_with_timeout exited %s\n",
2188
(ret == 0) ? "successfully" : "with error");
2189
}
2190
1083
2191
end:
1084
1085
if (debug){
1086
fprintf(stderr, "%s exiting\n", argv[0]);
1087
}
1088
1089
/* Cleanup things */
1090
if (sb != NULL)
1091
avahi_s_service_browser_free(sb);
1092
1093
if (mc.server != NULL)
1094
avahi_server_free(mc.server);
1095
1096
if (mc.simple_poll != NULL)
1097
avahi_simple_poll_free(mc.simple_poll);
1098
1099
if (gnutls_initalized){
1100
gnutls_certificate_free_credentials(mc.cred);
1101
gnutls_global_deinit ();
1102
gnutls_dh_params_deinit(mc.dh_params);
1103
}
1104
1105
if(gpgme_initalized){
1106
gpgme_release(mc.ctx);
1107
}
1108
1109
/* Removes the temp directory used by GPGME */
1110
if(tempdir[0] != '\0'){
1111
DIR *d;
1112
struct dirent *direntry;
1113
d = opendir(tempdir);
1114
if(d == NULL){
1115
perror("opendir");
1116
} else {
1117
while(true){
1118
direntry = readdir(d);
1119
if(direntry == NULL){
1120
break;
1121
}
1122
if (direntry->d_type == DT_REG){
1123
char *fullname = NULL;
1124
ret = asprintf(&fullname, "%s/%s", tempdir,
1125
direntry->d_name);
1126
if(ret < 0){
1127
perror("asprintf");
1128
continue;
1129
}
1130
ret = unlink(fullname);
1131
if(ret == -1){
1132
fprintf(stderr, "unlink(\"%s\"): %s",
1133
fullname, strerror(errno));
1134
}
1135
free(fullname);
1136
}
1137
}
1138
closedir(d);
1139
}
1140
ret = rmdir(tempdir);
1141
if(ret == -1){
1142
perror("rmdir");
1143
}
1144
}
1145
1146
return exitcode;
2192
2193
if(debug){
2194
fprintf(stderr, "Mandos plugin mandos-client: "
2195
"%s exiting\n", argv[0]);
2196
}
2197
2198
/* Cleanup things */
2199
if(sb != NULL)
2200
avahi_s_service_browser_free(sb);
2201
2202
if(mc.server != NULL)
2203
avahi_server_free(mc.server);
2204
2205
if(mc.simple_poll != NULL)
2206
avahi_simple_poll_free(mc.simple_poll);
2207
2208
if(gnutls_initialized){
2209
gnutls_certificate_free_credentials(mc.cred);
2210
gnutls_global_deinit();
2211
gnutls_dh_params_deinit(mc.dh_params);
2212
}
2213
2214
if(gpgme_initialized){
2215
gpgme_release(mc.ctx);
2216
}
2217
2218
/* Cleans up the circular linked list of Mandos servers the client
2219
has seen */
2220
if(mc.current_server != NULL){
2221
mc.current_server->prev->next = NULL;
2222
while(mc.current_server != NULL){
2223
server *next = mc.current_server->next;
2224
free(mc.current_server);
2225
mc.current_server = next;
2226
}
2227
}
2228
2229
/* XXX run network hooks "stop" here */
2230
2231
/* Take down the network interface */
2232
if(take_down_interface){
2233
/* Re-raise priviliges */
2234
errno = 0;
2235
ret = seteuid(0);
2236
if(ret == -1){
2237
perror_plus("seteuid");
2238
}
2239
if(geteuid() == 0){
2240
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2241
if(ret == -1){
2242
perror_plus("ioctl SIOCGIFFLAGS");
2243
} else if(network.ifr_flags & IFF_UP){
2244
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2245
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2246
if(ret == -1){
2247
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2248
}
2249
}
2250
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2251
if(ret == -1){
2252
perror_plus("close");
2253
}
2254
/* Lower privileges permanently */
2255
errno = 0;
2256
ret = setuid(uid);
2257
if(ret == -1){
2258
perror_plus("setuid");
2259
}
2260
}
2261
}
2262
2263
/* Removes the GPGME temp directory and all files inside */
2264
if(tempdir_created){
2265
struct dirent **direntries = NULL;
2266
struct dirent *direntry = NULL;
2267
int numentries = scandir(tempdir, &direntries, notdotentries,
2268
alphasort);
2269
if (numentries > 0){
2270
for(int i = 0; i < numentries; i++){
2271
direntry = direntries[i];
2272
char *fullname = NULL;
2273
ret = asprintf(&fullname, "%s/%s", tempdir,
2274
direntry->d_name);
2275
if(ret < 0){
2276
perror_plus("asprintf");
2277
continue;
2278
}
2279
ret = remove(fullname);
2280
if(ret == -1){
2281
fprintf(stderr, "Mandos plugin mandos-client: "
2282
"remove(\"%s\"): %s\n", fullname, strerror(errno));
2283
}
2284
free(fullname);
2285
}
2286
}
2287
2288
/* need to clean even if 0 because man page doesn't specify */
2289
free(direntries);
2290
if (numentries == -1){
2291
perror_plus("scandir");
2292
}
2293
ret = rmdir(tempdir);
2294
if(ret == -1 and errno != ENOENT){
2295
perror_plus("rmdir");
2296
}
2297
}
2298
2299
if(quit_now){
2300
sigemptyset(&old_sigterm_action.sa_mask);
2301
old_sigterm_action.sa_handler = SIG_DFL;
2302
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2303
&old_sigterm_action,
2304
NULL));
2305
if(ret == -1){
2306
perror_plus("sigaction");
2307
}
2308
do {
2309
ret = raise(signal_received);
2310
} while(ret != 0 and errno == EINTR);
2311
if(ret != 0){
2312
perror_plus("raise");
2313
abort();
2314
}
2315
TEMP_FAILURE_RETRY(pause());
2316
}
2317
2318
return exitcode;
1147
2319
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0