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» Revision
24.1.51
(compared to revision 237.16.6)
: plugins.d/password-request.c
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- Committer: Björn Påhlsson
- Date: 2008-08-15 20:17:32 UTC
- mto: (237.7.1 mandos) (24.1.154 mandos)
- mto: This revision was merged to the branch mainline in revision 77.
- Revision ID: belorn@braxen-20080815201732-b7uux3yqs05b3fy9
Added configuration files support for mandos-client
Removed plus argument support for mandos-client
Removed plus argument support for mandos-client
- files added:
- network-protocol.txt
- files removed:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- files renamed:
- plugin-runner.c => mandos-client.c
- plugin-runner.xml => mandos-client.xml
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.xml
- files modified:
- Makefile
added
removed
plugins.d/password-request.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 © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
12
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
14
13
*
15
14
* This program is free software: you can redistribute it and/or
16
15
* modify it under the terms of the GNU General Public License as
26
25
* along with this program. If not, see
27
26
* <http://www.gnu.org/licenses/>.
28
27
*
29
* Contact the authors at <mandos@recompile.se>.
28
* Contact the authors at <mandos@fukt.bsnet.se>.
30
29
*/
31
30
32
31
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
34
32
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
37
33
#define _FILE_OFFSET_BITS 64
38
#endif
39
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
34
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
36
37
#include <stdio.h> /* fprintf(), stderr, fwrite(), stdout,
38
ferror() */
44
39
#include <stdint.h> /* uint16_t, uint32_t */
45
40
#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 */
41
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
42
srand() */
43
#include <stdbool.h> /* bool, true */
49
44
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
45
strerror(), memcpy(), strcpy() */
46
#include <sys/ioctl.h> /* ioctl */
52
47
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
48
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
49
SOCK_STREAM, INET6_ADDRSTRLEN,
50
uid_t, gid_t */
51
#include <inttypes.h> /* PRIu16 */
57
52
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
*/
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
53
struct in6_addr, inet_pton(),
54
connect() */
64
55
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
56
#include <errno.h> /* perror(), errno */
57
#include <time.h> /* time() */
68
58
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
59
SIOCSIFFLAGS, if_indextoname(),
70
60
if_nametoindex(), IF_NAMESIZE */
71
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
*/
74
61
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
78
#include <iso646.h> /* not, or, and */
62
getuid(), getgid(), setuid(),
63
setgid() */
64
#include <netinet/in.h>
65
#include <arpa/inet.h> /* inet_pton(), htons */
66
#include <iso646.h> /* not, and */
79
67
#include <argp.h> /* struct argp_option, error_t, struct
80
68
argp_state, struct argp,
81
69
argp_parse(), ARGP_KEY_ARG,
82
70
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__ */
94
71
95
72
/* Avahi */
96
73
/* All Avahi types, constants and functions
104
81
#include <avahi-common/error.h>
105
82
106
83
/* GnuTLS */
107
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
108
functions:
84
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and functions
109
85
gnutls_*
110
86
init_gnutls_session(),
111
87
GNUTLS_* */
112
#include <gnutls/openpgp.h>
113
/* gnutls_certificate_set_openpgp_key_file(),
114
GNUTLS_OPENPGP_FMT_BASE64 */
88
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
89
GNUTLS_OPENPGP_FMT_BASE64 */
115
90
116
91
/* GPGME */
117
#include <gpgme.h> /* All GPGME types, constants and
118
functions:
92
#include <gpgme.h> /* All GPGME types, constants and functions
119
93
gpgme_*
120
94
GPGME_PROTOCOL_OpenPGP,
121
95
GPG_ERR_NO_* */
122
96
123
97
#define BUFFER_SIZE 256
124
98
125
#define PATHDIR "/conf/conf.d/mandos"
126
#define SECKEY "seckey.txt"
127
#define PUBKEY "pubkey.txt"
128
#define HOOKDIR "/lib/mandos/network-hooks.d"
129
130
99
bool debug = false;
100
static const char *keydir = "/conf/conf.d/mandos";
131
101
static const char mandos_protocol_version[] = "1";
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;
102
const char *argp_program_version = "password-request 1.0";
103
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
148
104
149
105
/* Used for passing in values through the Avahi callback functions */
150
106
typedef struct {
154
110
unsigned int dh_bits;
155
111
gnutls_dh_params_t dh_params;
156
112
const char *priority;
157
gpgme_ctx_t ctx;
158
server *current_server;
159
113
} mandos_context;
160
114
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
177
115
/*
178
* Make additional room in "buffer" for at least BUFFER_SIZE more
179
* bytes. "buffer_capacity" is how much is currently allocated,
116
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
117
* "buffer_capacity" is how much is currently allocated,
180
118
* "buffer_length" is how much is already used.
181
119
*/
182
size_t incbuffer(char **buffer, size_t buffer_length,
183
size_t buffer_capacity){
184
if(buffer_length + BUFFER_SIZE > buffer_capacity){
120
size_t adjustbuffer(char **buffer, size_t buffer_length,
121
size_t buffer_capacity){
122
if (buffer_length + BUFFER_SIZE > buffer_capacity){
185
123
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
186
if(buffer == NULL){
124
if (buffer == NULL){
187
125
return 0;
188
126
}
189
127
buffer_capacity += BUFFER_SIZE;
191
129
return buffer_capacity;
192
130
}
193
131
194
/* Add server to set of servers to retry periodically */
195
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
196
int af){
197
int ret;
198
server *new_server = malloc(sizeof(server));
199
if(new_server == NULL){
200
perror_plus("malloc");
201
return -1;
202
}
203
*new_server = (server){ .ip = strdup(ip),
204
.port = port,
205
.if_index = if_index,
206
.af = af };
207
if(new_server->ip == NULL){
208
perror_plus("strdup");
209
return -1;
210
}
211
/* Special case of first server */
212
if (mc.current_server == NULL){
213
new_server->next = new_server;
214
new_server->prev = new_server;
215
mc.current_server = new_server;
216
/* Place the new server last in the list */
217
} else {
218
new_server->next = mc.current_server;
219
new_server->prev = mc.current_server->prev;
220
new_server->prev->next = new_server;
221
mc.current_server->prev = new_server;
222
}
223
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
224
if(ret == -1){
225
perror_plus("clock_gettime");
226
return -1;
227
}
228
return 0;
229
}
230
231
132
/*
232
* Initialize GPGME.
133
* Decrypt OpenPGP data using keyrings in HOMEDIR.
134
* Returns -1 on error
233
135
*/
234
static bool init_gpgme(const char *seckey, const char *pubkey,
235
const char *tempdir){
136
static ssize_t pgp_packet_decrypt (const char *cryptotext,
137
size_t crypto_size,
138
char **plaintext,
139
const char *homedir){
140
gpgme_data_t dh_crypto, dh_plain;
141
gpgme_ctx_t ctx;
236
142
gpgme_error_t rc;
143
ssize_t ret;
144
size_t plaintext_capacity = 0;
145
ssize_t plaintext_length = 0;
237
146
gpgme_engine_info_t engine_info;
238
147
239
240
/*
241
* Helper function to insert pub and seckey to the engine keyring.
242
*/
243
bool import_key(const char *filename){
244
int ret;
245
int fd;
246
gpgme_data_t pgp_data;
247
248
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
249
if(fd == -1){
250
perror_plus("open");
251
return false;
252
}
253
254
rc = gpgme_data_new_from_fd(&pgp_data, fd);
255
if(rc != GPG_ERR_NO_ERROR){
256
fprintf(stderr, "Mandos plugin mandos-client: "
257
"bad gpgme_data_new_from_fd: %s: %s\n",
258
gpgme_strsource(rc), gpgme_strerror(rc));
259
return false;
260
}
261
262
rc = gpgme_op_import(mc.ctx, pgp_data);
263
if(rc != GPG_ERR_NO_ERROR){
264
fprintf(stderr, "Mandos plugin mandos-client: "
265
"bad gpgme_op_import: %s: %s\n",
266
gpgme_strsource(rc), gpgme_strerror(rc));
267
return false;
268
}
269
270
ret = (int)TEMP_FAILURE_RETRY(close(fd));
271
if(ret == -1){
272
perror_plus("close");
273
}
274
gpgme_data_release(pgp_data);
275
return true;
276
}
277
278
if(debug){
279
fprintf(stderr, "Mandos plugin mandos-client: "
280
"Initializing GPGME\n");
148
if (debug){
149
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
281
150
}
282
151
283
152
/* Init GPGME */
284
153
gpgme_check_version(NULL);
285
154
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
286
if(rc != GPG_ERR_NO_ERROR){
287
fprintf(stderr, "Mandos plugin mandos-client: "
288
"bad gpgme_engine_check_version: %s: %s\n",
155
if (rc != GPG_ERR_NO_ERROR){
156
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
289
157
gpgme_strsource(rc), gpgme_strerror(rc));
290
return false;
158
return -1;
291
159
}
292
160
293
161
/* Set GPGME home directory for the OpenPGP engine only */
294
rc = gpgme_get_engine_info(&engine_info);
295
if(rc != GPG_ERR_NO_ERROR){
296
fprintf(stderr, "Mandos plugin mandos-client: "
297
"bad gpgme_get_engine_info: %s: %s\n",
162
rc = gpgme_get_engine_info (&engine_info);
163
if (rc != GPG_ERR_NO_ERROR){
164
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
298
165
gpgme_strsource(rc), gpgme_strerror(rc));
299
return false;
166
return -1;
300
167
}
301
168
while(engine_info != NULL){
302
169
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
303
170
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
304
engine_info->file_name, tempdir);
171
engine_info->file_name, homedir);
305
172
break;
306
173
}
307
174
engine_info = engine_info->next;
308
175
}
309
176
if(engine_info == NULL){
310
fprintf(stderr, "Mandos plugin mandos-client: "
311
"Could not set GPGME home dir to %s\n", tempdir);
312
return false;
313
}
314
315
/* Create new GPGME "context" */
316
rc = gpgme_new(&(mc.ctx));
317
if(rc != GPG_ERR_NO_ERROR){
318
fprintf(stderr, "Mandos plugin mandos-client: "
319
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
320
gpgme_strerror(rc));
321
return false;
322
}
323
324
if(not import_key(pubkey) or not import_key(seckey)){
325
return false;
326
}
327
328
return true;
329
}
330
331
/*
332
* Decrypt OpenPGP data.
333
* Returns -1 on error
334
*/
335
static ssize_t pgp_packet_decrypt(const char *cryptotext,
336
size_t crypto_size,
337
char **plaintext){
338
gpgme_data_t dh_crypto, dh_plain;
339
gpgme_error_t rc;
340
ssize_t ret;
341
size_t plaintext_capacity = 0;
342
ssize_t plaintext_length = 0;
343
344
if(debug){
345
fprintf(stderr, "Mandos plugin mandos-client: "
346
"Trying to decrypt OpenPGP data\n");
177
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
178
return -1;
347
179
}
348
180
349
181
/* Create new GPGME data buffer from memory cryptotext */
350
182
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
351
183
0);
352
if(rc != GPG_ERR_NO_ERROR){
353
fprintf(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_data_new_from_mem: %s: %s\n",
184
if (rc != GPG_ERR_NO_ERROR){
185
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
355
186
gpgme_strsource(rc), gpgme_strerror(rc));
356
187
return -1;
357
188
}
358
189
359
190
/* Create new empty GPGME data buffer for the plaintext */
360
191
rc = gpgme_data_new(&dh_plain);
361
if(rc != GPG_ERR_NO_ERROR){
362
fprintf(stderr, "Mandos plugin mandos-client: "
363
"bad gpgme_data_new: %s: %s\n",
192
if (rc != GPG_ERR_NO_ERROR){
193
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
364
194
gpgme_strsource(rc), gpgme_strerror(rc));
365
195
gpgme_data_release(dh_crypto);
366
196
return -1;
367
197
}
368
198
199
/* Create new GPGME "context" */
200
rc = gpgme_new(&ctx);
201
if (rc != GPG_ERR_NO_ERROR){
202
fprintf(stderr, "bad gpgme_new: %s: %s\n",
203
gpgme_strsource(rc), gpgme_strerror(rc));
204
plaintext_length = -1;
205
goto decrypt_end;
206
}
207
369
208
/* Decrypt data from the cryptotext data buffer to the plaintext
370
209
data buffer */
371
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
372
if(rc != GPG_ERR_NO_ERROR){
373
fprintf(stderr, "Mandos plugin mandos-client: "
374
"bad gpgme_op_decrypt: %s: %s\n",
210
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
211
if (rc != GPG_ERR_NO_ERROR){
212
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
375
213
gpgme_strsource(rc), gpgme_strerror(rc));
376
214
plaintext_length = -1;
377
if(debug){
378
gpgme_decrypt_result_t result;
379
result = gpgme_op_decrypt_result(mc.ctx);
380
if(result == NULL){
381
fprintf(stderr, "Mandos plugin mandos-client: "
382
"gpgme_op_decrypt_result failed\n");
383
} else {
384
fprintf(stderr, "Mandos plugin mandos-client: "
385
"Unsupported algorithm: %s\n",
386
result->unsupported_algorithm);
387
fprintf(stderr, "Mandos plugin mandos-client: "
388
"Wrong key usage: %u\n",
389
result->wrong_key_usage);
390
if(result->file_name != NULL){
391
fprintf(stderr, "Mandos plugin mandos-client: "
392
"File name: %s\n", result->file_name);
393
}
394
gpgme_recipient_t recipient;
395
recipient = result->recipients;
215
goto decrypt_end;
216
}
217
218
if(debug){
219
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
220
}
221
222
if (debug){
223
gpgme_decrypt_result_t result;
224
result = gpgme_op_decrypt_result(ctx);
225
if (result == NULL){
226
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
227
} else {
228
fprintf(stderr, "Unsupported algorithm: %s\n",
229
result->unsupported_algorithm);
230
fprintf(stderr, "Wrong key usage: %u\n",
231
result->wrong_key_usage);
232
if(result->file_name != NULL){
233
fprintf(stderr, "File name: %s\n", result->file_name);
234
}
235
gpgme_recipient_t recipient;
236
recipient = result->recipients;
237
if(recipient){
396
238
while(recipient != NULL){
397
fprintf(stderr, "Mandos plugin mandos-client: "
398
"Public key algorithm: %s\n",
239
fprintf(stderr, "Public key algorithm: %s\n",
399
240
gpgme_pubkey_algo_name(recipient->pubkey_algo));
400
fprintf(stderr, "Mandos plugin mandos-client: "
401
"Key ID: %s\n", recipient->keyid);
402
fprintf(stderr, "Mandos plugin mandos-client: "
403
"Secret key available: %s\n",
241
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
242
fprintf(stderr, "Secret key available: %s\n",
404
243
recipient->status == GPG_ERR_NO_SECKEY
405
244
? "No" : "Yes");
406
245
recipient = recipient->next;
407
246
}
408
247
}
409
248
}
410
goto decrypt_end;
411
}
412
413
if(debug){
414
fprintf(stderr, "Mandos plugin mandos-client: "
415
"Decryption of OpenPGP data succeeded\n");
416
249
}
417
250
418
251
/* Seek back to the beginning of the GPGME plaintext data buffer */
419
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
420
perror_plus("gpgme_data_seek");
252
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
253
perror("pgpme_data_seek");
421
254
plaintext_length = -1;
422
255
goto decrypt_end;
423
256
}
424
257
425
258
*plaintext = NULL;
426
259
while(true){
427
plaintext_capacity = incbuffer(plaintext,
428
(size_t)plaintext_length,
429
plaintext_capacity);
430
if(plaintext_capacity == 0){
431
perror_plus("incbuffer");
432
plaintext_length = -1;
433
goto decrypt_end;
260
plaintext_capacity = adjustbuffer(plaintext,
261
(size_t)plaintext_length,
262
plaintext_capacity);
263
if (plaintext_capacity == 0){
264
perror("adjustbuffer");
265
plaintext_length = -1;
266
goto decrypt_end;
434
267
}
435
268
436
269
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
437
270
BUFFER_SIZE);
438
271
/* Print the data, if any */
439
if(ret == 0){
272
if (ret == 0){
440
273
/* EOF */
441
274
break;
442
275
}
443
276
if(ret < 0){
444
perror_plus("gpgme_data_read");
277
perror("gpgme_data_read");
445
278
plaintext_length = -1;
446
279
goto decrypt_end;
447
280
}
448
281
plaintext_length += ret;
449
282
}
450
283
451
284
if(debug){
452
fprintf(stderr, "Mandos plugin mandos-client: "
453
"Decrypted password is: ");
285
fprintf(stderr, "Decrypted password is: ");
454
286
for(ssize_t i = 0; i < plaintext_length; i++){
455
287
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
456
288
}
467
299
return plaintext_length;
468
300
}
469
301
470
static const char * safer_gnutls_strerror(int value){
471
const char *ret = gnutls_strerror(value); /* Spurious warning from
472
-Wunreachable-code */
473
if(ret == NULL)
302
static const char * safer_gnutls_strerror (int value) {
303
const char *ret = gnutls_strerror (value);
304
if (ret == NULL)
474
305
ret = "(unknown)";
475
306
return ret;
476
307
}
478
309
/* GnuTLS log function callback */
479
310
static void debuggnutls(__attribute__((unused)) int level,
480
311
const char* string){
481
fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);
312
fprintf(stderr, "GnuTLS: %s", string);
482
313
}
483
314
484
static int init_gnutls_global(const char *pubkeyfilename,
485
const char *seckeyfilename){
315
static int init_gnutls_global(mandos_context *mc,
316
const char *pubkeyfile,
317
const char *seckeyfile){
486
318
int ret;
487
319
488
320
if(debug){
489
fprintf(stderr, "Mandos plugin mandos-client: "
490
"Initializing GnuTLS\n");
321
fprintf(stderr, "Initializing GnuTLS\n");
491
322
}
492
323
493
324
ret = gnutls_global_init();
494
if(ret != GNUTLS_E_SUCCESS){
495
fprintf(stderr, "Mandos plugin mandos-client: "
496
"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
325
if (ret != GNUTLS_E_SUCCESS) {
326
fprintf (stderr, "GnuTLS global_init: %s\n",
327
safer_gnutls_strerror(ret));
497
328
return -1;
498
329
}
499
330
500
if(debug){
331
if (debug){
501
332
/* "Use a log level over 10 to enable all debugging options."
502
333
* - GnuTLS manual
503
334
*/
506
337
}
507
338
508
339
/* OpenPGP credentials */
509
ret = gnutls_certificate_allocate_credentials(&mc.cred);
510
if(ret != GNUTLS_E_SUCCESS){
511
fprintf(stderr, "Mandos plugin mandos-client: "
512
"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
513
gnutls_global_deinit();
340
gnutls_certificate_allocate_credentials(&mc->cred);
341
if (ret != GNUTLS_E_SUCCESS){
342
fprintf (stderr, "GnuTLS memory error: %s\n",
343
safer_gnutls_strerror(ret));
344
gnutls_global_deinit ();
514
345
return -1;
515
346
}
516
347
517
348
if(debug){
518
fprintf(stderr, "Mandos plugin mandos-client: "
519
"Attempting to use OpenPGP public key %s and"
520
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
521
seckeyfilename);
349
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
350
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
351
seckeyfile);
522
352
}
523
353
524
354
ret = gnutls_certificate_set_openpgp_key_file
525
(mc.cred, pubkeyfilename, seckeyfilename,
526
GNUTLS_OPENPGP_FMT_BASE64);
527
if(ret != GNUTLS_E_SUCCESS){
355
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
356
if (ret != GNUTLS_E_SUCCESS) {
528
357
fprintf(stderr,
529
"Mandos plugin mandos-client: "
530
358
"Error[%d] while reading the OpenPGP key pair ('%s',"
531
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
532
fprintf(stderr, "Mandos plugin mandos-client: "
533
"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));
359
" '%s')\n", ret, pubkeyfile, seckeyfile);
360
fprintf(stdout, "The GnuTLS error is: %s\n",
361
safer_gnutls_strerror(ret));
534
362
goto globalfail;
535
363
}
536
364
537
365
/* GnuTLS server initialization */
538
ret = gnutls_dh_params_init(&mc.dh_params);
539
if(ret != GNUTLS_E_SUCCESS){
540
fprintf(stderr, "Mandos plugin mandos-client: "
541
"Error in GnuTLS DH parameter initialization:"
542
" %s\n", safer_gnutls_strerror(ret));
543
goto globalfail;
544
}
545
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
546
if(ret != GNUTLS_E_SUCCESS){
547
fprintf(stderr, "Mandos plugin mandos-client: "
548
"Error in GnuTLS prime generation: %s\n",
549
safer_gnutls_strerror(ret));
550
goto globalfail;
551
}
552
553
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
554
366
ret = gnutls_dh_params_init(&mc->dh_params);
367
if (ret != GNUTLS_E_SUCCESS) {
368
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
369
" %s\n", safer_gnutls_strerror(ret));
370
goto globalfail;
371
}
372
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
373
if (ret != GNUTLS_E_SUCCESS) {
374
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
375
safer_gnutls_strerror(ret));
376
goto globalfail;
377
}
378
379
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
380
555
381
return 0;
556
382
557
383
globalfail:
558
559
gnutls_certificate_free_credentials(mc.cred);
384
385
gnutls_certificate_free_credentials(mc->cred);
560
386
gnutls_global_deinit();
561
gnutls_dh_params_deinit(mc.dh_params);
562
387
return -1;
388
563
389
}
564
390
565
static int init_gnutls_session(gnutls_session_t *session){
391
static int init_gnutls_session(mandos_context *mc,
392
gnutls_session_t *session){
566
393
int ret;
567
394
/* GnuTLS session creation */
568
do {
569
ret = gnutls_init(session, GNUTLS_SERVER);
570
if(quit_now){
571
return -1;
572
}
573
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
574
if(ret != GNUTLS_E_SUCCESS){
575
fprintf(stderr, "Mandos plugin mandos-client: "
576
"Error in GnuTLS session initialization: %s\n",
395
ret = gnutls_init(session, GNUTLS_SERVER);
396
if (ret != GNUTLS_E_SUCCESS){
397
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
577
398
safer_gnutls_strerror(ret));
578
399
}
579
400
580
401
{
581
402
const char *err;
582
do {
583
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
584
if(quit_now){
585
gnutls_deinit(*session);
586
return -1;
587
}
588
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
589
if(ret != GNUTLS_E_SUCCESS){
590
fprintf(stderr, "Mandos plugin mandos-client: "
591
"Syntax error at: %s\n", err);
592
fprintf(stderr, "Mandos plugin mandos-client: "
593
"GnuTLS error: %s\n", safer_gnutls_strerror(ret));
594
gnutls_deinit(*session);
403
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
404
if (ret != GNUTLS_E_SUCCESS) {
405
fprintf(stderr, "Syntax error at: %s\n", err);
406
fprintf(stderr, "GnuTLS error: %s\n",
407
safer_gnutls_strerror(ret));
408
gnutls_deinit (*session);
595
409
return -1;
596
410
}
597
411
}
598
412
599
do {
600
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
601
mc.cred);
602
if(quit_now){
603
gnutls_deinit(*session);
604
return -1;
605
}
606
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
607
if(ret != GNUTLS_E_SUCCESS){
608
fprintf(stderr, "Mandos plugin mandos-client: "
609
"Error setting GnuTLS credentials: %s\n",
413
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
414
mc->cred);
415
if (ret != GNUTLS_E_SUCCESS) {
416
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
610
417
safer_gnutls_strerror(ret));
611
gnutls_deinit(*session);
418
gnutls_deinit (*session);
612
419
return -1;
613
420
}
614
421
615
422
/* ignore client certificate if any. */
616
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
423
gnutls_certificate_server_set_request (*session,
424
GNUTLS_CERT_IGNORE);
617
425
618
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
426
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
619
427
620
428
return 0;
621
429
}
627
435
/* Called when a Mandos server is found */
628
436
static int start_mandos_communication(const char *ip, uint16_t port,
629
437
AvahiIfIndex if_index,
630
int af){
631
int ret, tcp_sd = -1;
632
ssize_t sret;
633
union {
634
struct sockaddr_in in;
635
struct sockaddr_in6 in6;
636
} to;
438
mandos_context *mc){
439
int ret, tcp_sd;
440
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
637
441
char *buffer = NULL;
638
char *decrypted_buffer = NULL;
442
char *decrypted_buffer;
639
443
size_t buffer_length = 0;
640
444
size_t buffer_capacity = 0;
445
ssize_t decrypted_buffer_size;
641
446
size_t written;
642
int retval = -1;
447
int retval = 0;
448
char interface[IF_NAMESIZE];
643
449
gnutls_session_t session;
644
int pf; /* Protocol family */
645
646
errno = 0;
647
648
if(quit_now){
649
errno = EINTR;
650
return -1;
651
}
652
653
switch(af){
654
case AF_INET6:
655
pf = PF_INET6;
656
break;
657
case AF_INET:
658
pf = PF_INET;
659
break;
660
default:
661
fprintf(stderr, "Mandos plugin mandos-client: "
662
"Bad address family: %d\n", af);
663
errno = EINVAL;
664
return -1;
665
}
666
667
ret = init_gnutls_session(&session);
668
if(ret != 0){
450
451
ret = init_gnutls_session (mc, &session);
452
if (ret != 0){
669
453
return -1;
670
454
}
671
455
672
456
if(debug){
673
fprintf(stderr, "Mandos plugin mandos-client: "
674
"Setting up a TCP connection to %s, port %" PRIu16
457
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
675
458
"\n", ip, port);
676
459
}
677
460
678
tcp_sd = socket(pf, SOCK_STREAM, 0);
679
if(tcp_sd < 0){
680
int e = errno;
681
perror_plus("socket");
682
errno = e;
683
goto mandos_end;
684
}
685
686
if(quit_now){
687
errno = EINTR;
688
goto mandos_end;
689
}
690
691
memset(&to, 0, sizeof(to));
692
if(af == AF_INET6){
693
to.in6.sin6_family = (sa_family_t)af;
694
ret = inet_pton(af, ip, &to.in6.sin6_addr);
695
} else { /* IPv4 */
696
to.in.sin_family = (sa_family_t)af;
697
ret = inet_pton(af, ip, &to.in.sin_addr);
698
}
699
if(ret < 0 ){
700
int e = errno;
701
perror_plus("inet_pton");
702
errno = e;
703
goto mandos_end;
461
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
462
if(tcp_sd < 0) {
463
perror("socket");
464
return -1;
465
}
466
467
if(debug){
468
if(if_indextoname((unsigned int)if_index, interface) == NULL){
469
perror("if_indextoname");
470
return -1;
471
}
472
fprintf(stderr, "Binding to interface %s\n", interface);
473
}
474
475
memset(&to,0,sizeof(to)); /* Spurious warning */
476
to.in6.sin6_family = AF_INET6;
477
/* It would be nice to have a way to detect if we were passed an
478
IPv4 address here. Now we assume an IPv6 address. */
479
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
480
if (ret < 0 ){
481
perror("inet_pton");
482
return -1;
704
483
}
705
484
if(ret == 0){
706
int e = errno;
707
fprintf(stderr, "Mandos plugin mandos-client: "
708
"Bad address: %s\n", ip);
709
errno = e;
710
goto mandos_end;
711
}
712
if(af == AF_INET6){
713
to.in6.sin6_port = htons(port); /* Spurious warnings from
714
-Wconversion and
715
-Wunreachable-code */
716
717
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
718
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
719
-Wunreachable-code*/
720
if(if_index == AVAHI_IF_UNSPEC){
721
fprintf(stderr, "Mandos plugin mandos-client: "
722
"An IPv6 link-local address is incomplete"
723
" without a network interface\n");
724
errno = EINVAL;
725
goto mandos_end;
726
}
727
/* Set the network interface number as scope */
728
to.in6.sin6_scope_id = (uint32_t)if_index;
729
}
730
} else {
731
to.in.sin_port = htons(port); /* Spurious warnings from
732
-Wconversion and
733
-Wunreachable-code */
734
}
485
fprintf(stderr, "Bad address: %s\n", ip);
486
return -1;
487
}
488
to.in6.sin6_port = htons(port); /* Spurious warning */
735
489
736
if(quit_now){
737
errno = EINTR;
738
goto mandos_end;
739
}
490
to.in6.sin6_scope_id = (uint32_t)if_index;
740
491
741
492
if(debug){
742
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
743
char interface[IF_NAMESIZE];
744
if(if_indextoname((unsigned int)if_index, interface) == NULL){
745
perror_plus("if_indextoname");
746
} else {
747
fprintf(stderr, "Mandos plugin mandos-client: "
748
"Connection to: %s%%%s, port %" PRIu16 "\n",
749
ip, interface, port);
750
}
751
} else {
752
fprintf(stderr, "Mandos plugin mandos-client: "
753
"Connection to: %s, port %" PRIu16 "\n", ip, port);
754
}
755
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
756
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
757
const char *pcret;
758
if(af == AF_INET6){
759
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
760
sizeof(addrstr));
761
} else {
762
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
763
sizeof(addrstr));
764
}
765
if(pcret == NULL){
766
perror_plus("inet_ntop");
493
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
494
port);
495
char addrstr[INET6_ADDRSTRLEN] = "";
496
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
497
sizeof(addrstr)) == NULL){
498
perror("inet_ntop");
767
499
} else {
768
500
if(strcmp(addrstr, ip) != 0){
769
fprintf(stderr, "Mandos plugin mandos-client: "
770
"Canonical address form: %s\n", addrstr);
501
fprintf(stderr, "Canonical address form: %s\n", addrstr);
771
502
}
772
503
}
773
504
}
774
505
775
if(quit_now){
776
errno = EINTR;
777
goto mandos_end;
778
}
779
780
if(af == AF_INET6){
781
ret = connect(tcp_sd, &to.in6, sizeof(to));
782
} else {
783
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
784
}
785
if(ret < 0){
786
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
787
int e = errno;
788
perror_plus("connect");
789
errno = e;
790
}
791
goto mandos_end;
792
}
793
794
if(quit_now){
795
errno = EINTR;
796
goto mandos_end;
797
}
798
506
ret = connect(tcp_sd, &to.in, sizeof(to));
507
if (ret < 0){
508
perror("connect");
509
return -1;
510
}
511
799
512
const char *out = mandos_protocol_version;
800
513
written = 0;
801
while(true){
514
while (true){
802
515
size_t out_size = strlen(out);
803
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
804
out_size - written));
805
if(ret == -1){
806
int e = errno;
807
perror_plus("write");
808
errno = e;
516
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
517
out_size - written));
518
if (ret == -1){
519
perror("write");
520
retval = -1;
809
521
goto mandos_end;
810
522
}
811
523
written += (size_t)ret;
812
524
if(written < out_size){
813
525
continue;
814
526
} else {
815
if(out == mandos_protocol_version){
527
if (out == mandos_protocol_version){
816
528
written = 0;
817
529
out = "\r\n";
818
530
} else {
819
531
break;
820
532
}
821
533
}
822
823
if(quit_now){
824
errno = EINTR;
825
goto mandos_end;
826
}
827
534
}
828
535
829
536
if(debug){
830
fprintf(stderr, "Mandos plugin mandos-client: "
831
"Establishing TLS session with %s\n", ip);
832
}
833
834
if(quit_now){
835
errno = EINTR;
836
goto mandos_end;
837
}
838
839
/* Spurious warning from -Wint-to-pointer-cast */
840
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
841
842
if(quit_now){
843
errno = EINTR;
844
goto mandos_end;
845
}
846
847
do {
848
ret = gnutls_handshake(session);
849
if(quit_now){
850
errno = EINTR;
851
goto mandos_end;
852
}
537
fprintf(stderr, "Establishing TLS session with %s\n", ip);
538
}
539
540
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
541
542
do{
543
ret = gnutls_handshake (session);
853
544
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
854
545
855
if(ret != GNUTLS_E_SUCCESS){
546
if (ret != GNUTLS_E_SUCCESS){
856
547
if(debug){
857
fprintf(stderr, "Mandos plugin mandos-client: "
858
"*** GnuTLS Handshake failed ***\n");
859
gnutls_perror(ret);
548
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
549
gnutls_perror (ret);
860
550
}
861
errno = EPROTO;
551
retval = -1;
862
552
goto mandos_end;
863
553
}
864
554
865
555
/* Read OpenPGP packet that contains the wanted password */
866
556
867
557
if(debug){
868
fprintf(stderr, "Mandos plugin mandos-client: "
869
"Retrieving OpenPGP encrypted password from %s\n", ip);
558
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
559
ip);
870
560
}
871
561
872
562
while(true){
873
874
if(quit_now){
875
errno = EINTR;
876
goto mandos_end;
877
}
878
879
buffer_capacity = incbuffer(&buffer, buffer_length,
880
buffer_capacity);
881
if(buffer_capacity == 0){
882
int e = errno;
883
perror_plus("incbuffer");
884
errno = e;
885
goto mandos_end;
886
}
887
888
if(quit_now){
889
errno = EINTR;
890
goto mandos_end;
891
}
892
893
sret = gnutls_record_recv(session, buffer+buffer_length,
894
BUFFER_SIZE);
895
if(sret == 0){
563
buffer_capacity = adjustbuffer(&buffer, buffer_length,
564
buffer_capacity);
565
if (buffer_capacity == 0){
566
perror("adjustbuffer");
567
retval = -1;
568
goto mandos_end;
569
}
570
571
ret = gnutls_record_recv(session, buffer+buffer_length,
572
BUFFER_SIZE);
573
if (ret == 0){
896
574
break;
897
575
}
898
if(sret < 0){
899
switch(sret){
576
if (ret < 0){
577
switch(ret){
900
578
case GNUTLS_E_INTERRUPTED:
901
579
case GNUTLS_E_AGAIN:
902
580
break;
903
581
case GNUTLS_E_REHANDSHAKE:
904
do {
905
ret = gnutls_handshake(session);
906
907
if(quit_now){
908
errno = EINTR;
909
goto mandos_end;
910
}
582
do{
583
ret = gnutls_handshake (session);
911
584
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
912
if(ret < 0){
913
fprintf(stderr, "Mandos plugin mandos-client: "
914
"*** GnuTLS Re-handshake failed ***\n");
915
gnutls_perror(ret);
916
errno = EPROTO;
585
if (ret < 0){
586
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
587
gnutls_perror (ret);
588
retval = -1;
917
589
goto mandos_end;
918
590
}
919
591
break;
920
592
default:
921
fprintf(stderr, "Mandos plugin mandos-client: "
922
"Unknown error while reading data from"
593
fprintf(stderr, "Unknown error while reading data from"
923
594
" encrypted session with Mandos server\n");
924
gnutls_bye(session, GNUTLS_SHUT_RDWR);
925
errno = EIO;
595
retval = -1;
596
gnutls_bye (session, GNUTLS_SHUT_RDWR);
926
597
goto mandos_end;
927
598
}
928
599
} else {
929
buffer_length += (size_t) sret;
600
buffer_length += (size_t) ret;
930
601
}
931
602
}
932
603
933
604
if(debug){
934
fprintf(stderr, "Mandos plugin mandos-client: "
935
"Closing TLS session\n");
936
}
937
938
if(quit_now){
939
errno = EINTR;
940
goto mandos_end;
941
}
942
943
do {
944
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
945
if(quit_now){
946
errno = EINTR;
947
goto mandos_end;
948
}
949
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
950
951
if(buffer_length > 0){
952
ssize_t decrypted_buffer_size;
953
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
954
&decrypted_buffer);
955
if(decrypted_buffer_size >= 0){
956
605
fprintf(stderr, "Closing TLS session\n");
606
}
607
608
gnutls_bye (session, GNUTLS_SHUT_RDWR);
609
610
if (buffer_length > 0){
611
decrypted_buffer_size = pgp_packet_decrypt(buffer,
612
buffer_length,
613
&decrypted_buffer,
614
keydir);
615
if (decrypted_buffer_size >= 0){
957
616
written = 0;
958
617
while(written < (size_t) decrypted_buffer_size){
959
if(quit_now){
960
errno = EINTR;
961
goto mandos_end;
962
}
963
964
ret = (int)fwrite(decrypted_buffer + written, 1,
965
(size_t)decrypted_buffer_size - written,
966
stdout);
618
ret = (int)fwrite (decrypted_buffer + written, 1,
619
(size_t)decrypted_buffer_size - written,
620
stdout);
967
621
if(ret == 0 and ferror(stdout)){
968
int e = errno;
969
622
if(debug){
970
fprintf(stderr, "Mandos plugin mandos-client: "
971
"Error writing encrypted data: %s\n",
623
fprintf(stderr, "Error writing encrypted data: %s\n",
972
624
strerror(errno));
973
625
}
974
errno = e;
975
goto mandos_end;
626
retval = -1;
627
break;
976
628
}
977
629
written += (size_t)ret;
978
630
}
979
retval = 0;
631
free(decrypted_buffer);
632
} else {
633
retval = -1;
980
634
}
981
635
}
982
636
983
637
/* Shutdown procedure */
984
638
985
639
mandos_end:
986
{
987
int e = errno;
988
free(decrypted_buffer);
989
free(buffer);
990
if(tcp_sd >= 0){
991
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
992
}
993
if(ret == -1){
994
if(e == 0){
995
e = errno;
996
}
997
perror_plus("close");
998
}
999
gnutls_deinit(session);
1000
errno = e;
1001
if(quit_now){
1002
errno = EINTR;
1003
retval = -1;
1004
}
1005
}
640
free(buffer);
641
close(tcp_sd);
642
gnutls_deinit (session);
1006
643
return retval;
1007
644
}
1008
645
1009
646
static void resolve_callback(AvahiSServiceResolver *r,
1010
647
AvahiIfIndex interface,
1011
AvahiProtocol proto,
648
AVAHI_GCC_UNUSED AvahiProtocol protocol,
1012
649
AvahiResolverEvent event,
1013
650
const char *name,
1014
651
const char *type,
1019
656
AVAHI_GCC_UNUSED AvahiStringList *txt,
1020
657
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1021
658
flags,
1022
AVAHI_GCC_UNUSED void* userdata){
1023
assert(r);
659
void* userdata) {
660
mandos_context *mc = userdata;
661
assert(r); /* Spurious warning */
1024
662
1025
663
/* Called whenever a service has been resolved successfully or
1026
664
timed out */
1027
665
1028
if(quit_now){
1029
return;
1030
}
1031
1032
switch(event){
666
switch (event) {
1033
667
default:
1034
668
case AVAHI_RESOLVER_FAILURE:
1035
fprintf(stderr, "Mandos plugin mandos-client: "
1036
"(Avahi Resolver) Failed to resolve service '%s'"
669
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
1037
670
" of type '%s' in domain '%s': %s\n", name, type, domain,
1038
avahi_strerror(avahi_server_errno(mc.server)));
671
avahi_strerror(avahi_server_errno(mc->server)));
1039
672
break;
1040
673
1041
674
case AVAHI_RESOLVER_FOUND:
1043
676
char ip[AVAHI_ADDRESS_STR_MAX];
1044
677
avahi_address_snprint(ip, sizeof(ip), address);
1045
678
if(debug){
1046
fprintf(stderr, "Mandos plugin mandos-client: "
1047
"Mandos server \"%s\" found on %s (%s, %"
1048
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1049
ip, (intmax_t)interface, port);
679
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
680
PRIu16 ") on port %d\n", name, host_name, ip,
681
interface, port);
1050
682
}
1051
int ret = start_mandos_communication(ip, port, interface,
1052
avahi_proto_to_af(proto));
1053
if(ret == 0){
1054
avahi_simple_poll_quit(mc.simple_poll);
1055
} else {
1056
ret = add_server(ip, port, interface,
1057
avahi_proto_to_af(proto));
683
int ret = start_mandos_communication(ip, port, interface, mc);
684
if (ret == 0){
685
avahi_simple_poll_quit(mc->simple_poll);
1058
686
}
1059
687
}
1060
688
}
1061
689
avahi_s_service_resolver_free(r);
1062
690
}
1063
691
1064
static void browse_callback(AvahiSServiceBrowser *b,
1065
AvahiIfIndex interface,
1066
AvahiProtocol protocol,
1067
AvahiBrowserEvent event,
1068
const char *name,
1069
const char *type,
1070
const char *domain,
1071
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1072
flags,
1073
AVAHI_GCC_UNUSED void* userdata){
1074
assert(b);
692
static void browse_callback( AvahiSServiceBrowser *b,
693
AvahiIfIndex interface,
694
AvahiProtocol protocol,
695
AvahiBrowserEvent event,
696
const char *name,
697
const char *type,
698
const char *domain,
699
AVAHI_GCC_UNUSED AvahiLookupResultFlags
700
flags,
701
void* userdata) {
702
mandos_context *mc = userdata;
703
assert(b); /* Spurious warning */
1075
704
1076
705
/* Called whenever a new services becomes available on the LAN or
1077
706
is removed from the LAN */
1078
707
1079
if(quit_now){
1080
return;
1081
}
1082
1083
switch(event){
708
switch (event) {
1084
709
default:
1085
710
case AVAHI_BROWSER_FAILURE:
1086
711
1087
fprintf(stderr, "Mandos plugin mandos-client: "
1088
"(Avahi browser) %s\n",
1089
avahi_strerror(avahi_server_errno(mc.server)));
1090
avahi_simple_poll_quit(mc.simple_poll);
712
fprintf(stderr, "(Avahi browser) %s\n",
713
avahi_strerror(avahi_server_errno(mc->server)));
714
avahi_simple_poll_quit(mc->simple_poll);
1091
715
return;
1092
716
1093
717
case AVAHI_BROWSER_NEW:
1096
720
the callback function is called the Avahi server will free the
1097
721
resolver for us. */
1098
722
1099
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1100
name, type, domain, protocol, 0,
1101
resolve_callback, NULL) == NULL)
1102
fprintf(stderr, "Mandos plugin mandos-client: "
1103
"Avahi: Failed to resolve service '%s': %s\n",
1104
name, avahi_strerror(avahi_server_errno(mc.server)));
723
if (!(avahi_s_service_resolver_new(mc->server, interface,
724
protocol, name, type, domain,
725
AVAHI_PROTO_INET6, 0,
726
resolve_callback, mc)))
727
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
728
name, avahi_strerror(avahi_server_errno(mc->server)));
1105
729
break;
1106
730
1107
731
case AVAHI_BROWSER_REMOVE:
1110
734
case AVAHI_BROWSER_ALL_FOR_NOW:
1111
735
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1112
736
if(debug){
1113
fprintf(stderr, "Mandos plugin mandos-client: "
1114
"No Mandos server found, still searching...\n");
737
fprintf(stderr, "No Mandos server found, still searching...\n");
1115
738
}
1116
739
break;
1117
740
}
1118
741
}
1119
742
1120
/* Signal handler that stops main loop after SIGTERM */
1121
static void handle_sigterm(int sig){
1122
if(quit_now){
1123
return;
1124
}
1125
quit_now = 1;
1126
signal_received = sig;
1127
int old_errno = errno;
1128
/* set main loop to exit */
1129
if(mc.simple_poll != NULL){
1130
avahi_simple_poll_quit(mc.simple_poll);
1131
}
1132
errno = old_errno;
1133
}
1134
1135
bool get_flags(const char *ifname, struct ifreq *ifr){
1136
int ret;
1137
1138
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1139
if(s < 0){
1140
perror_plus("socket");
1141
return false;
1142
}
1143
strcpy(ifr->ifr_name, ifname);
1144
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1145
if(ret == -1){
1146
if(debug){
1147
perror_plus("ioctl SIOCGIFFLAGS");
1148
}
1149
return false;
1150
}
1151
return true;
1152
}
1153
1154
bool good_flags(const char *ifname, const struct ifreq *ifr){
1155
1156
/* Reject the loopback device */
1157
if(ifr->ifr_flags & IFF_LOOPBACK){
1158
if(debug){
1159
fprintf(stderr, "Mandos plugin mandos-client: "
1160
"Rejecting loopback interface \"%s\"\n", ifname);
1161
}
1162
return false;
1163
}
1164
/* Accept point-to-point devices only if connect_to is specified */
1165
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1166
if(debug){
1167
fprintf(stderr, "Mandos plugin mandos-client: "
1168
"Accepting point-to-point interface \"%s\"\n", ifname);
1169
}
1170
return true;
1171
}
1172
/* Otherwise, reject non-broadcast-capable devices */
1173
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1174
if(debug){
1175
fprintf(stderr, "Mandos plugin mandos-client: "
1176
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1177
}
1178
return false;
1179
}
1180
/* Reject non-ARP interfaces (including dummy interfaces) */
1181
if(ifr->ifr_flags & IFF_NOARP){
1182
if(debug){
1183
fprintf(stderr, "Mandos plugin mandos-client: "
1184
"Rejecting non-ARP interface \"%s\"\n", ifname);
1185
}
1186
return false;
1187
}
1188
1189
/* Accept this device */
1190
if(debug){
1191
fprintf(stderr, "Mandos plugin mandos-client: "
1192
"Interface \"%s\" is good\n", ifname);
1193
}
1194
return true;
1195
}
1196
1197
/*
1198
* This function determines if a directory entry in /sys/class/net
1199
* corresponds to an acceptable network device.
1200
* (This function is passed to scandir(3) as a filter function.)
1201
*/
1202
int good_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(stderr, "Mandos plugin mandos-client: "
1211
"Failed to get flags for interface \"%s\"\n",
1212
if_entry->d_name);
1213
}
1214
return 0;
1215
}
1216
1217
if(not good_flags(if_entry->d_name, &ifr)){
1218
return 0;
1219
}
1220
return 1;
1221
}
1222
1223
/*
1224
* This function determines if a directory entry in /sys/class/net
1225
* corresponds to an acceptable network device which is up.
1226
* (This function is passed to scandir(3) as a filter function.)
1227
*/
1228
int up_interface(const struct dirent *if_entry){
1229
if(if_entry->d_name[0] == '.'){
1230
return 0;
1231
}
1232
1233
struct ifreq ifr;
1234
if(not get_flags(if_entry->d_name, &ifr)){
1235
if(debug){
1236
fprintf(stderr, "Mandos plugin mandos-client: "
1237
"Failed to get flags for interface \"%s\"\n",
1238
if_entry->d_name);
1239
}
1240
return 0;
1241
}
1242
1243
/* Reject down interfaces */
1244
if(not (ifr.ifr_flags & IFF_UP)){
1245
if(debug){
1246
fprintf(stderr, "Mandos plugin mandos-client: "
1247
"Rejecting down interface \"%s\"\n",
1248
if_entry->d_name);
1249
}
1250
return 0;
1251
}
1252
1253
/* Reject non-running interfaces */
1254
if(not (ifr.ifr_flags & IFF_RUNNING)){
1255
if(debug){
1256
fprintf(stderr, "Mandos plugin mandos-client: "
1257
"Rejecting non-running interface \"%s\"\n",
1258
if_entry->d_name);
1259
}
1260
return 0;
1261
}
1262
1263
if(not good_flags(if_entry->d_name, &ifr)){
1264
return 0;
1265
}
1266
return 1;
1267
}
1268
1269
int notdotentries(const struct dirent *direntry){
1270
/* Skip "." and ".." */
1271
if(direntry->d_name[0] == '.'
1272
and (direntry->d_name[1] == '\0'
1273
or (direntry->d_name[1] == '.'
1274
and direntry->d_name[2] == '\0'))){
1275
return 0;
1276
}
1277
return 1;
1278
}
1279
1280
/* Is this directory entry a runnable program? */
1281
int runnable_hook(const struct dirent *direntry){
1282
int ret;
1283
size_t sret;
1284
struct stat st;
1285
1286
if((direntry->d_name)[0] == '\0'){
1287
/* Empty name? */
1288
return 0;
1289
}
1290
1291
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1292
"abcdefghijklmnopqrstuvwxyz"
1293
"0123456789"
1294
"_-");
1295
if((direntry->d_name)[sret] != '\0'){
1296
/* Contains non-allowed characters */
1297
if(debug){
1298
fprintf(stderr, "Mandos plugin mandos-client: "
1299
"Ignoring hook \"%s\" with bad name\n",
1300
direntry->d_name);
1301
}
1302
return 0;
1303
}
1304
1305
char *fullname = NULL;
1306
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1307
if(ret < 0){
1308
perror_plus("asprintf");
1309
return 0;
1310
}
1311
1312
ret = stat(fullname, &st);
1313
if(ret == -1){
1314
if(debug){
1315
perror_plus("Could not stat hook");
1316
}
1317
return 0;
1318
}
1319
if(not (S_ISREG(st.st_mode))){
1320
/* Not a regular file */
1321
if(debug){
1322
fprintf(stderr, "Mandos plugin mandos-client: "
1323
"Ignoring hook \"%s\" - not a file\n",
1324
direntry->d_name);
1325
}
1326
return 0;
1327
}
1328
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1329
/* Not executable */
1330
if(debug){
1331
fprintf(stderr, "Mandos plugin mandos-client: "
1332
"Ignoring hook \"%s\" - not executable\n",
1333
direntry->d_name);
1334
}
1335
return 0;
1336
}
1337
return 1;
1338
}
1339
1340
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1341
int ret;
1342
struct timespec now;
1343
struct timespec waited_time;
1344
intmax_t block_time;
1345
1346
while(true){
1347
if(mc.current_server == NULL){
1348
if (debug){
1349
fprintf(stderr, "Mandos plugin mandos-client: "
1350
"Wait until first server is found. No timeout!\n");
1351
}
1352
ret = avahi_simple_poll_iterate(s, -1);
1353
} else {
1354
if (debug){
1355
fprintf(stderr, "Mandos plugin mandos-client: "
1356
"Check current_server if we should run it,"
1357
" or wait\n");
1358
}
1359
/* the current time */
1360
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1361
if(ret == -1){
1362
perror_plus("clock_gettime");
1363
return -1;
1364
}
1365
/* Calculating in ms how long time between now and server
1366
who we visted longest time ago. Now - last seen. */
1367
waited_time.tv_sec = (now.tv_sec
1368
- mc.current_server->last_seen.tv_sec);
1369
waited_time.tv_nsec = (now.tv_nsec
1370
- mc.current_server->last_seen.tv_nsec);
1371
/* total time is 10s/10,000ms.
1372
Converting to s from ms by dividing by 1,000,
1373
and ns to ms by dividing by 1,000,000. */
1374
block_time = ((retry_interval
1375
- ((intmax_t)waited_time.tv_sec * 1000))
1376
- ((intmax_t)waited_time.tv_nsec / 1000000));
1377
1378
if (debug){
1379
fprintf(stderr, "Mandos plugin mandos-client: "
1380
"Blocking for %" PRIdMAX " ms\n", block_time);
1381
}
1382
1383
if(block_time <= 0){
1384
ret = start_mandos_communication(mc.current_server->ip,
1385
mc.current_server->port,
1386
mc.current_server->if_index,
1387
mc.current_server->af);
1388
if(ret == 0){
1389
avahi_simple_poll_quit(mc.simple_poll);
1390
return 0;
1391
}
1392
ret = clock_gettime(CLOCK_MONOTONIC,
1393
&mc.current_server->last_seen);
1394
if(ret == -1){
1395
perror_plus("clock_gettime");
1396
return -1;
1397
}
1398
mc.current_server = mc.current_server->next;
1399
block_time = 0; /* Call avahi to find new Mandos
1400
servers, but don't block */
1401
}
1402
1403
ret = avahi_simple_poll_iterate(s, (int)block_time);
1404
}
1405
if(ret != 0){
1406
if (ret > 0 or errno != EINTR){
1407
return (ret != 1) ? ret : 0;
1408
}
1409
}
1410
}
1411
}
743
/* Combines file name and path and returns the malloced new
744
string. some sane checks could/should be added */
745
static const char *combinepath(const char *first, const char *second){
746
size_t f_len = strlen(first);
747
size_t s_len = strlen(second);
748
char *tmp = malloc(f_len + s_len + 2);
749
if (tmp == NULL){
750
return NULL;
751
}
752
if(f_len > 0){
753
memcpy(tmp, first, f_len); /* Spurious warning */
754
}
755
tmp[f_len] = '/';
756
if(s_len > 0){
757
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
758
}
759
tmp[f_len + 1 + s_len] = '\0';
760
return tmp;
761
}
762
1412
763
1413
764
int main(int argc, char *argv[]){
1414
AvahiSServiceBrowser *sb = NULL;
1415
int error;
1416
int ret;
1417
intmax_t tmpmax;
1418
char *tmp;
1419
int exitcode = EXIT_SUCCESS;
1420
const char *interface = "";
1421
struct ifreq network;
1422
int sd = -1;
1423
bool take_down_interface = false;
1424
uid_t uid;
1425
gid_t gid;
1426
char tempdir[] = "/tmp/mandosXXXXXX";
1427
bool tempdir_created = false;
1428
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1429
const char *seckey = PATHDIR "/" SECKEY;
1430
const char *pubkey = PATHDIR "/" PUBKEY;
1431
1432
bool gnutls_initialized = false;
1433
bool gpgme_initialized = false;
1434
float delay = 2.5f;
1435
double retry_interval = 10; /* 10s between trying a server and
1436
retrying the same server again */
1437
1438
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1439
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1440
1441
uid = getuid();
1442
gid = getgid();
1443
1444
/* Lower any group privileges we might have, just to be safe */
1445
errno = 0;
1446
ret = setgid(gid);
1447
if(ret == -1){
1448
perror_plus("setgid");
1449
}
1450
1451
/* Lower user privileges (temporarily) */
1452
errno = 0;
1453
ret = seteuid(uid);
1454
if(ret == -1){
1455
perror_plus("seteuid");
1456
}
1457
1458
if(quit_now){
1459
goto end;
1460
}
1461
1462
{
1463
struct argp_option options[] = {
1464
{ .name = "debug", .key = 128,
1465
.doc = "Debug mode", .group = 3 },
1466
{ .name = "connect", .key = 'c',
1467
.arg = "ADDRESS:PORT",
1468
.doc = "Connect directly to a specific Mandos server",
1469
.group = 1 },
1470
{ .name = "interface", .key = 'i',
1471
.arg = "NAME",
1472
.doc = "Network interface that will be used to search for"
1473
" Mandos servers",
1474
.group = 1 },
1475
{ .name = "seckey", .key = 's',
1476
.arg = "FILE",
1477
.doc = "OpenPGP secret key file base name",
1478
.group = 1 },
1479
{ .name = "pubkey", .key = 'p',
1480
.arg = "FILE",
1481
.doc = "OpenPGP public key file base name",
1482
.group = 2 },
1483
{ .name = "dh-bits", .key = 129,
1484
.arg = "BITS",
1485
.doc = "Bit length of the prime number used in the"
1486
" Diffie-Hellman key exchange",
1487
.group = 2 },
1488
{ .name = "priority", .key = 130,
1489
.arg = "STRING",
1490
.doc = "GnuTLS priority string for the TLS handshake",
1491
.group = 1 },
1492
{ .name = "delay", .key = 131,
1493
.arg = "SECONDS",
1494
.doc = "Maximum delay to wait for interface startup",
1495
.group = 2 },
1496
{ .name = "retry", .key = 132,
1497
.arg = "SECONDS",
1498
.doc = "Retry interval used when denied by the mandos server",
1499
.group = 2 },
1500
{ .name = "network-hook-dir", .key = 133,
1501
.arg = "DIR",
1502
.doc = "Directory where network hooks are located",
1503
.group = 2 },
1504
/*
1505
* These reproduce what we would get without ARGP_NO_HELP
1506
*/
1507
{ .name = "help", .key = '?',
1508
.doc = "Give this help list", .group = -1 },
1509
{ .name = "usage", .key = -3,
1510
.doc = "Give a short usage message", .group = -1 },
1511
{ .name = "version", .key = 'V',
1512
.doc = "Print program version", .group = -1 },
1513
{ .name = NULL }
1514
};
1515
1516
error_t parse_opt(int key, char *arg,
1517
struct argp_state *state){
1518
errno = 0;
1519
switch(key){
1520
case 128: /* --debug */
1521
debug = true;
1522
break;
1523
case 'c': /* --connect */
1524
connect_to = arg;
1525
break;
1526
case 'i': /* --interface */
1527
interface = arg;
1528
break;
1529
case 's': /* --seckey */
1530
seckey = arg;
1531
break;
1532
case 'p': /* --pubkey */
1533
pubkey = arg;
1534
break;
1535
case 129: /* --dh-bits */
1536
errno = 0;
1537
tmpmax = strtoimax(arg, &tmp, 10);
1538
if(errno != 0 or tmp == arg or *tmp != '\0'
1539
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1540
argp_error(state, "Bad number of DH bits");
1541
}
1542
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1543
break;
1544
case 130: /* --priority */
1545
mc.priority = arg;
1546
break;
1547
case 131: /* --delay */
1548
errno = 0;
1549
delay = strtof(arg, &tmp);
1550
if(errno != 0 or tmp == arg or *tmp != '\0'){
1551
argp_error(state, "Bad delay");
1552
}
1553
case 132: /* --retry */
1554
errno = 0;
1555
retry_interval = strtod(arg, &tmp);
1556
if(errno != 0 or tmp == arg or *tmp != '\0'
1557
or (retry_interval * 1000) > INT_MAX
1558
or retry_interval < 0){
1559
argp_error(state, "Bad retry interval");
1560
}
1561
break;
1562
case 133: /* --network-hook-dir */
1563
hookdir = arg;
1564
break;
1565
/*
1566
* These reproduce what we would get without ARGP_NO_HELP
1567
*/
1568
case '?': /* --help */
1569
argp_state_help(state, state->out_stream,
1570
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1571
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1572
case -3: /* --usage */
1573
argp_state_help(state, state->out_stream,
1574
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1575
case 'V': /* --version */
1576
fprintf(state->out_stream, "Mandos plugin mandos-client: ");
1577
fprintf(state->out_stream, "%s\n", argp_program_version);
1578
exit(argp_err_exit_status);
1579
break;
1580
default:
1581
return ARGP_ERR_UNKNOWN;
1582
}
1583
return errno;
1584
}
1585
1586
struct argp argp = { .options = options, .parser = parse_opt,
1587
.args_doc = "",
1588
.doc = "Mandos client -- Get and decrypt"
1589
" passwords from a Mandos server" };
1590
ret = argp_parse(&argp, argc, argv,
1591
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1592
switch(ret){
1593
case 0:
1594
break;
1595
case ENOMEM:
1596
default:
1597
errno = ret;
1598
perror_plus("argp_parse");
1599
exitcode = EX_OSERR;
1600
goto end;
1601
case EINVAL:
1602
exitcode = EX_USAGE;
1603
goto end;
1604
}
1605
}
1606
1607
{
1608
/* Work around Debian bug #633582:
1609
<http://bugs.debian.org/633582> */
1610
struct stat st;
1611
1612
/* Re-raise priviliges */
1613
errno = 0;
1614
ret = seteuid(0);
1615
if(ret == -1){
1616
perror_plus("seteuid");
1617
}
1618
1619
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1620
int seckey_fd = open(seckey, O_RDONLY);
1621
if(seckey_fd == -1){
1622
perror_plus("open");
1623
} else {
1624
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1625
if(ret == -1){
1626
perror_plus("fstat");
1627
} else {
1628
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1629
ret = fchown(seckey_fd, uid, gid);
1630
if(ret == -1){
1631
perror_plus("fchown");
1632
}
1633
}
1634
}
1635
TEMP_FAILURE_RETRY(close(seckey_fd));
1636
}
1637
}
1638
1639
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1640
int pubkey_fd = open(pubkey, O_RDONLY);
1641
if(pubkey_fd == -1){
1642
perror_plus("open");
1643
} else {
1644
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1645
if(ret == -1){
1646
perror_plus("fstat");
1647
} else {
1648
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1649
ret = fchown(pubkey_fd, uid, gid);
1650
if(ret == -1){
1651
perror_plus("fchown");
1652
}
1653
}
1654
}
1655
TEMP_FAILURE_RETRY(close(pubkey_fd));
1656
}
1657
}
1658
1659
/* Lower privileges */
1660
errno = 0;
1661
ret = seteuid(uid);
1662
if(ret == -1){
1663
perror_plus("seteuid");
1664
}
1665
}
1666
1667
/* Find network hooks and run them */
1668
{
1669
struct dirent **direntries;
1670
struct dirent *direntry;
1671
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1672
alphasort);
1673
if(numhooks == -1){
1674
perror_plus("scandir");
765
AvahiSServiceBrowser *sb = NULL;
766
int error;
767
int ret;
768
int exitcode = EXIT_SUCCESS;
769
const char *interface = "eth0";
770
struct ifreq network;
771
int sd;
772
uid_t uid;
773
gid_t gid;
774
char *connect_to = NULL;
775
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
776
const char *pubkeyfile = "pubkey.txt";
777
const char *seckeyfile = "seckey.txt";
778
mandos_context mc = { .simple_poll = NULL, .server = NULL,
779
.dh_bits = 1024, .priority = "SECURE256"};
780
bool gnutls_initalized = false;
781
782
{
783
struct argp_option options[] = {
784
{ .name = "debug", .key = 128,
785
.doc = "Debug mode", .group = 3 },
786
{ .name = "connect", .key = 'c',
787
.arg = "IP",
788
.doc = "Connect directly to a sepcified mandos server",
789
.group = 1 },
790
{ .name = "interface", .key = 'i',
791
.arg = "INTERFACE",
792
.doc = "Interface that Avahi will conntect through",
793
.group = 1 },
794
{ .name = "keydir", .key = 'd',
795
.arg = "KEYDIR",
796
.doc = "Directory where the openpgp keyring is",
797
.group = 1 },
798
{ .name = "seckey", .key = 's',
799
.arg = "SECKEY",
800
.doc = "Secret openpgp key for gnutls authentication",
801
.group = 1 },
802
{ .name = "pubkey", .key = 'p',
803
.arg = "PUBKEY",
804
.doc = "Public openpgp key for gnutls authentication",
805
.group = 2 },
806
{ .name = "dh-bits", .key = 129,
807
.arg = "BITS",
808
.doc = "dh-bits to use in gnutls communication",
809
.group = 2 },
810
{ .name = "priority", .key = 130,
811
.arg = "PRIORITY",
812
.doc = "GNUTLS priority", .group = 1 },
813
{ .name = NULL }
814
};
815
816
817
error_t parse_opt (int key, char *arg,
818
struct argp_state *state) {
819
/* Get the INPUT argument from `argp_parse', which we know is
820
a pointer to our plugin list pointer. */
821
switch (key) {
822
case 128:
823
debug = true;
824
break;
825
case 'c':
826
connect_to = arg;
827
break;
828
case 'i':
829
interface = arg;
830
break;
831
case 'd':
832
keydir = arg;
833
break;
834
case 's':
835
seckeyfile = arg;
836
break;
837
case 'p':
838
pubkeyfile = arg;
839
break;
840
case 129:
841
errno = 0;
842
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
843
if (errno){
844
perror("strtol");
845
exit(EXIT_FAILURE);
846
}
847
break;
848
case 130:
849
mc.priority = arg;
850
break;
851
case ARGP_KEY_ARG:
852
argp_usage (state);
853
case ARGP_KEY_END:
854
break;
855
default:
856
return ARGP_ERR_UNKNOWN;
857
}
858
return 0;
859
}
860
861
struct argp argp = { .options = options, .parser = parse_opt,
862
.args_doc = "",
863
.doc = "Mandos client -- Get and decrypt"
864
" passwords from mandos server" };
865
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
866
if (ret == ARGP_ERR_UNKNOWN){
867
fprintf(stderr, "Unknown error while parsing arguments\n");
868
exitcode = EXIT_FAILURE;
869
goto end;
870
}
871
}
872
873
pubkeyfile = combinepath(keydir, pubkeyfile);
874
if (pubkeyfile == NULL){
875
perror("combinepath");
876
exitcode = EXIT_FAILURE;
877
goto end;
878
}
879
880
seckeyfile = combinepath(keydir, seckeyfile);
881
if (seckeyfile == NULL){
882
perror("combinepath");
883
exitcode = EXIT_FAILURE;
884
goto end;
885
}
886
887
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
888
if (ret == -1){
889
fprintf(stderr, "init_gnutls_global failed\n");
890
exitcode = EXIT_FAILURE;
891
goto end;
1675
892
} else {
1676
int devnull = open("/dev/null", O_RDONLY);
1677
for(int i = 0; i < numhooks; i++){
1678
direntry = direntries[0];
1679
char *fullname = NULL;
1680
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1681
if(ret < 0){
1682
perror_plus("asprintf");
1683
continue;
1684
}
1685
pid_t hook_pid = fork();
1686
if(hook_pid == 0){
1687
/* Child */
1688
dup2(devnull, STDIN_FILENO);
1689
close(devnull);
1690
dup2(STDERR_FILENO, STDOUT_FILENO);
1691
ret = setenv("DEVICE", interface, 1);
1692
if(ret == -1){
1693
perror_plus("setenv");
1694
exit(1);
1695
}
1696
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1697
if(ret == -1){
1698
perror_plus("setenv");
1699
exit(1);
1700
}
1701
ret = setenv("MODE", "start", 1);
1702
if(ret == -1){
1703
perror_plus("setenv");
1704
exit(1);
1705
}
1706
char *delaystring;
1707
ret = asprintf(&delaystring, "%f", delay);
1708
if(ret == -1){
1709
perror_plus("asprintf");
1710
exit(1);
1711
}
1712
ret = setenv("DELAY", delaystring, 1);
1713
if(ret == -1){
1714
free(delaystring);
1715
perror_plus("setenv");
1716
exit(1);
1717
}
1718
free(delaystring);
1719
ret = execl(fullname, direntry->d_name, "start", NULL);
1720
perror_plus("execl");
1721
} else {
1722
int status;
1723
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1724
perror_plus("waitpid");
1725
free(fullname);
1726
continue;
1727
}
1728
if(WIFEXITED(status)){
1729
if(WEXITSTATUS(status) != 0){
1730
fprintf(stderr, "Mandos plugin mandos-client: "
1731
"Warning: network hook \"%s\" exited"
1732
" with status %d\n", direntry->d_name,
1733
WEXITSTATUS(status));
1734
free(fullname);
1735
continue;
1736
}
1737
} else if(WIFSIGNALED(status)){
1738
fprintf(stderr, "Mandos plugin mandos-client: "
1739
"Warning: network hook \"%s\" died by"
1740
" signal %d\n", direntry->d_name,
1741
WTERMSIG(status));
1742
free(fullname);
1743
continue;
1744
} else {
1745
fprintf(stderr, "Mandos plugin mandos-client: "
1746
"Warning: network hook \"%s\" crashed\n",
1747
direntry->d_name);
1748
free(fullname);
1749
continue;
1750
}
1751
}
1752
free(fullname);
1753
if(quit_now){
893
gnutls_initalized = true;
894
}
895
896
/* If the interface is down, bring it up */
897
{
898
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
899
if(sd < 0) {
900
perror("socket");
901
exitcode = EXIT_FAILURE;
902
goto end;
903
}
904
strcpy(network.ifr_name, interface); /* Spurious warning */
905
ret = ioctl(sd, SIOCGIFFLAGS, &network);
906
if(ret == -1){
907
perror("ioctl SIOCGIFFLAGS");
908
exitcode = EXIT_FAILURE;
909
goto end;
910
}
911
if((network.ifr_flags & IFF_UP) == 0){
912
network.ifr_flags |= IFF_UP;
913
ret = ioctl(sd, SIOCSIFFLAGS, &network);
914
if(ret == -1){
915
perror("ioctl SIOCSIFFLAGS");
916
exitcode = EXIT_FAILURE;
1754
917
goto end;
1755
918
}
1756
919
}
1757
close(devnull);
1758
}
1759
}
1760
1761
if(not debug){
1762
avahi_set_log_function(empty_log);
1763
}
1764
1765
if(interface[0] == '\0'){
1766
struct dirent **direntries;
1767
/* First look for interfaces that are up */
1768
ret = scandir(sys_class_net, &direntries, up_interface,
1769
alphasort);
1770
if(ret == 0){
1771
/* No up interfaces, look for any good interfaces */
1772
free(direntries);
1773
ret = scandir(sys_class_net, &direntries, good_interface,
1774
alphasort);
1775
}
1776
if(ret >= 1){
1777
/* Pick the first interface returned */
1778
interface = strdup(direntries[0]->d_name);
1779
if(debug){
1780
fprintf(stderr, "Mandos plugin mandos-client: "
1781
"Using interface \"%s\"\n", interface);
1782
}
1783
if(interface == NULL){
1784
perror_plus("malloc");
1785
free(direntries);
1786
exitcode = EXIT_FAILURE;
1787
goto end;
1788
}
1789
free(direntries);
1790
} else {
1791
free(direntries);
1792
fprintf(stderr, "Mandos plugin mandos-client: "
1793
"Could not find a network interface\n");
1794
exitcode = EXIT_FAILURE;
1795
goto end;
1796
}
1797
}
1798
1799
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1800
from the signal handler */
1801
/* Initialize the pseudo-RNG for Avahi */
1802
srand((unsigned int) time(NULL));
1803
mc.simple_poll = avahi_simple_poll_new();
1804
if(mc.simple_poll == NULL){
1805
fprintf(stderr, "Mandos plugin mandos-client: "
1806
"Avahi: Failed to create simple poll object.\n");
1807
exitcode = EX_UNAVAILABLE;
1808
goto end;
1809
}
1810
1811
sigemptyset(&sigterm_action.sa_mask);
1812
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1813
if(ret == -1){
1814
perror_plus("sigaddset");
1815
exitcode = EX_OSERR;
1816
goto end;
1817
}
1818
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1819
if(ret == -1){
1820
perror_plus("sigaddset");
1821
exitcode = EX_OSERR;
1822
goto end;
1823
}
1824
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1825
if(ret == -1){
1826
perror_plus("sigaddset");
1827
exitcode = EX_OSERR;
1828
goto end;
1829
}
1830
/* Need to check if the handler is SIG_IGN before handling:
1831
| [[info:libc:Initial Signal Actions]] |
1832
| [[info:libc:Basic Signal Handling]] |
1833
*/
1834
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1835
if(ret == -1){
1836
perror_plus("sigaction");
1837
return EX_OSERR;
1838
}
1839
if(old_sigterm_action.sa_handler != SIG_IGN){
1840
ret = sigaction(SIGINT, &sigterm_action, NULL);
1841
if(ret == -1){
1842
perror_plus("sigaction");
1843
exitcode = EX_OSERR;
1844
goto end;
1845
}
1846
}
1847
ret = sigaction(SIGHUP, 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(SIGHUP, &sigterm_action, NULL);
1854
if(ret == -1){
1855
perror_plus("sigaction");
1856
exitcode = EX_OSERR;
1857
goto end;
1858
}
1859
}
1860
ret = sigaction(SIGTERM, 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(SIGTERM, &sigterm_action, NULL);
1867
if(ret == -1){
1868
perror_plus("sigaction");
1869
exitcode = EX_OSERR;
1870
goto end;
1871
}
1872
}
1873
1874
/* If the interface is down, bring it up */
1875
if(strcmp(interface, "none") != 0){
920
close(sd);
921
}
922
923
uid = getuid();
924
gid = getgid();
925
926
ret = setuid(uid);
927
if (ret == -1){
928
perror("setuid");
929
}
930
931
setgid(gid);
932
if (ret == -1){
933
perror("setgid");
934
}
935
1876
936
if_index = (AvahiIfIndex) if_nametoindex(interface);
1877
937
if(if_index == 0){
1878
fprintf(stderr, "Mandos plugin mandos-client: "
1879
"No such interface: \"%s\"\n", interface);
1880
exitcode = EX_UNAVAILABLE;
1881
goto end;
1882
}
1883
1884
if(quit_now){
1885
goto end;
1886
}
1887
1888
/* Re-raise priviliges */
1889
errno = 0;
1890
ret = seteuid(0);
1891
if(ret == -1){
1892
perror_plus("seteuid");
1893
}
1894
1895
#ifdef __linux__
1896
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1897
messages about the network interface to mess up the prompt */
1898
ret = klogctl(8, NULL, 5);
1899
bool restore_loglevel = true;
1900
if(ret == -1){
1901
restore_loglevel = false;
1902
perror_plus("klogctl");
1903
}
1904
#endif /* __linux__ */
1905
1906
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1907
if(sd < 0){
1908
perror_plus("socket");
1909
exitcode = EX_OSERR;
1910
#ifdef __linux__
1911
if(restore_loglevel){
1912
ret = klogctl(7, NULL, 0);
1913
if(ret == -1){
1914
perror_plus("klogctl");
1915
}
1916
}
1917
#endif /* __linux__ */
1918
/* Lower privileges */
1919
errno = 0;
1920
ret = seteuid(uid);
1921
if(ret == -1){
1922
perror_plus("seteuid");
1923
}
1924
goto end;
1925
}
1926
strcpy(network.ifr_name, interface);
1927
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1928
if(ret == -1){
1929
perror_plus("ioctl SIOCGIFFLAGS");
1930
#ifdef __linux__
1931
if(restore_loglevel){
1932
ret = klogctl(7, NULL, 0);
1933
if(ret == -1){
1934
perror_plus("klogctl");
1935
}
1936
}
1937
#endif /* __linux__ */
1938
exitcode = EX_OSERR;
1939
/* Lower privileges */
1940
errno = 0;
1941
ret = seteuid(uid);
1942
if(ret == -1){
1943
perror_plus("seteuid");
1944
}
1945
goto end;
1946
}
1947
if((network.ifr_flags & IFF_UP) == 0){
1948
network.ifr_flags |= IFF_UP;
1949
take_down_interface = true;
1950
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1951
if(ret == -1){
1952
take_down_interface = false;
1953
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1954
exitcode = EX_OSERR;
1955
#ifdef __linux__
1956
if(restore_loglevel){
1957
ret = klogctl(7, NULL, 0);
1958
if(ret == -1){
1959
perror_plus("klogctl");
1960
}
1961
}
1962
#endif /* __linux__ */
1963
/* Lower privileges */
1964
errno = 0;
1965
ret = seteuid(uid);
1966
if(ret == -1){
1967
perror_plus("seteuid");
1968
}
1969
goto end;
1970
}
1971
}
1972
/* Sleep checking until interface is running.
1973
Check every 0.25s, up to total time of delay */
1974
for(int i=0; i < delay * 4; i++){
1975
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1976
if(ret == -1){
1977
perror_plus("ioctl SIOCGIFFLAGS");
1978
} else if(network.ifr_flags & IFF_RUNNING){
1979
break;
1980
}
1981
struct timespec sleeptime = { .tv_nsec = 250000000 };
1982
ret = nanosleep(&sleeptime, NULL);
1983
if(ret == -1 and errno != EINTR){
1984
perror_plus("nanosleep");
1985
}
1986
}
1987
if(not take_down_interface){
1988
/* We won't need the socket anymore */
1989
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1990
if(ret == -1){
1991
perror_plus("close");
1992
}
1993
}
1994
#ifdef __linux__
1995
if(restore_loglevel){
1996
/* Restores kernel loglevel to default */
1997
ret = klogctl(7, NULL, 0);
1998
if(ret == -1){
1999
perror_plus("klogctl");
2000
}
2001
}
2002
#endif /* __linux__ */
2003
/* Lower privileges */
2004
errno = 0;
2005
if(take_down_interface){
2006
/* Lower privileges */
2007
ret = seteuid(uid);
2008
if(ret == -1){
2009
perror_plus("seteuid");
2010
}
2011
} else {
2012
/* Lower privileges permanently */
2013
ret = setuid(uid);
2014
if(ret == -1){
2015
perror_plus("setuid");
2016
}
2017
}
2018
}
2019
2020
if(quit_now){
2021
goto end;
2022
}
2023
2024
ret = init_gnutls_global(pubkey, seckey);
2025
if(ret == -1){
2026
fprintf(stderr, "Mandos plugin mandos-client: "
2027
"init_gnutls_global failed\n");
2028
exitcode = EX_UNAVAILABLE;
2029
goto end;
2030
} else {
2031
gnutls_initialized = true;
2032
}
2033
2034
if(quit_now){
2035
goto end;
2036
}
2037
2038
if(mkdtemp(tempdir) == NULL){
2039
perror_plus("mkdtemp");
2040
goto end;
2041
}
2042
tempdir_created = true;
2043
2044
if(quit_now){
2045
goto end;
2046
}
2047
2048
if(not init_gpgme(pubkey, seckey, tempdir)){
2049
fprintf(stderr, "Mandos plugin mandos-client: "
2050
"init_gpgme failed\n");
2051
exitcode = EX_UNAVAILABLE;
2052
goto end;
2053
} else {
2054
gpgme_initialized = true;
2055
}
2056
2057
if(quit_now){
2058
goto end;
2059
}
2060
2061
if(connect_to != NULL){
2062
/* Connect directly, do not use Zeroconf */
2063
/* (Mainly meant for debugging) */
2064
char *address = strrchr(connect_to, ':');
2065
if(address == NULL){
2066
fprintf(stderr, "Mandos plugin mandos-client: "
2067
"No colon in address\n");
2068
exitcode = EX_USAGE;
2069
goto end;
2070
}
2071
2072
if(quit_now){
2073
goto end;
2074
}
2075
2076
uint16_t port;
2077
errno = 0;
2078
tmpmax = strtoimax(address+1, &tmp, 10);
2079
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2080
or tmpmax != (uint16_t)tmpmax){
2081
fprintf(stderr, "Mandos plugin mandos-client: "
2082
"Bad port number\n");
2083
exitcode = EX_USAGE;
2084
goto end;
2085
}
2086
2087
if(quit_now){
2088
goto end;
2089
}
2090
2091
port = (uint16_t)tmpmax;
2092
*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
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(stderr, "Mandos plugin mandos-client: "
2119
"Retrying in %d seconds\n", (int)retry_interval);
2120
}
2121
sleep((int)retry_interval);
2122
}
2123
2124
if (not quit_now){
2125
exitcode = EXIT_SUCCESS;
2126
}
2127
2128
goto end;
2129
}
2130
2131
if(quit_now){
2132
goto end;
2133
}
2134
2135
{
2136
AvahiServerConfig config;
2137
/* Do not publish any local Zeroconf records */
2138
avahi_server_config_init(&config);
2139
config.publish_hinfo = 0;
2140
config.publish_addresses = 0;
2141
config.publish_workstation = 0;
2142
config.publish_domain = 0;
2143
2144
/* Allocate a new server */
2145
mc.server = avahi_server_new(avahi_simple_poll_get
2146
(mc.simple_poll), &config, NULL,
2147
NULL, &error);
2148
2149
/* Free the Avahi configuration data */
2150
avahi_server_config_free(&config);
2151
}
2152
2153
/* Check if creating the Avahi server object succeeded */
2154
if(mc.server == NULL){
2155
fprintf(stderr, "Mandos plugin mandos-client: "
2156
"Failed to create Avahi server: %s\n",
2157
avahi_strerror(error));
2158
exitcode = EX_UNAVAILABLE;
2159
goto end;
2160
}
2161
2162
if(quit_now){
2163
goto end;
2164
}
2165
2166
/* Create the Avahi service browser */
2167
sb = avahi_s_service_browser_new(mc.server, if_index,
2168
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2169
NULL, 0, browse_callback, NULL);
2170
if(sb == NULL){
2171
fprintf(stderr, "Mandos plugin mandos-client: "
2172
"Failed to create service browser: %s\n",
2173
avahi_strerror(avahi_server_errno(mc.server)));
2174
exitcode = EX_UNAVAILABLE;
2175
goto end;
2176
}
2177
2178
if(quit_now){
2179
goto end;
2180
}
2181
2182
/* Run the main loop */
2183
2184
if(debug){
2185
fprintf(stderr, "Mandos plugin mandos-client: "
2186
"Starting Avahi loop search\n");
2187
}
2188
2189
ret = avahi_loop_with_timeout(mc.simple_poll,
2190
(int)(retry_interval * 1000));
2191
if(debug){
2192
fprintf(stderr, "Mandos plugin mandos-client: "
2193
"avahi_loop_with_timeout exited %s\n",
2194
(ret == 0) ? "successfully" : "with error");
2195
}
2196
938
fprintf(stderr, "No such interface: \"%s\"\n", interface);
939
exit(EXIT_FAILURE);
940
}
941
942
if(connect_to != NULL){
943
/* Connect directly, do not use Zeroconf */
944
/* (Mainly meant for debugging) */
945
char *address = strrchr(connect_to, ':');
946
if(address == NULL){
947
fprintf(stderr, "No colon in address\n");
948
exitcode = EXIT_FAILURE;
949
goto end;
950
}
951
errno = 0;
952
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
953
if(errno){
954
perror("Bad port number");
955
exitcode = EXIT_FAILURE;
956
goto end;
957
}
958
*address = '\0';
959
address = connect_to;
960
ret = start_mandos_communication(address, port, if_index, &mc);
961
if(ret < 0){
962
exitcode = EXIT_FAILURE;
963
} else {
964
exitcode = EXIT_SUCCESS;
965
}
966
goto end;
967
}
968
969
if (not debug){
970
avahi_set_log_function(empty_log);
971
}
972
973
/* Initialize the pseudo-RNG for Avahi */
974
srand((unsigned int) time(NULL));
975
976
/* Allocate main Avahi loop object */
977
mc.simple_poll = avahi_simple_poll_new();
978
if (mc.simple_poll == NULL) {
979
fprintf(stderr, "Avahi: Failed to create simple poll"
980
" object.\n");
981
exitcode = EXIT_FAILURE;
982
goto end;
983
}
984
985
{
986
AvahiServerConfig config;
987
/* Do not publish any local Zeroconf records */
988
avahi_server_config_init(&config);
989
config.publish_hinfo = 0;
990
config.publish_addresses = 0;
991
config.publish_workstation = 0;
992
config.publish_domain = 0;
993
994
/* Allocate a new server */
995
mc.server = avahi_server_new(avahi_simple_poll_get
996
(mc.simple_poll), &config, NULL,
997
NULL, &error);
998
999
/* Free the Avahi configuration data */
1000
avahi_server_config_free(&config);
1001
}
1002
1003
/* Check if creating the Avahi server object succeeded */
1004
if (mc.server == NULL) {
1005
fprintf(stderr, "Failed to create Avahi server: %s\n",
1006
avahi_strerror(error));
1007
exitcode = EXIT_FAILURE;
1008
goto end;
1009
}
1010
1011
/* Create the Avahi service browser */
1012
sb = avahi_s_service_browser_new(mc.server, if_index,
1013
AVAHI_PROTO_INET6,
1014
"_mandos._tcp", NULL, 0,
1015
browse_callback, &mc);
1016
if (sb == NULL) {
1017
fprintf(stderr, "Failed to create service browser: %s\n",
1018
avahi_strerror(avahi_server_errno(mc.server)));
1019
exitcode = EXIT_FAILURE;
1020
goto end;
1021
}
1022
1023
/* Run the main loop */
1024
1025
if (debug){
1026
fprintf(stderr, "Starting Avahi loop search\n");
1027
}
1028
1029
avahi_simple_poll_loop(mc.simple_poll);
1030
2197
1031
end:
2198
2199
if(debug){
2200
fprintf(stderr, "Mandos plugin mandos-client: "
2201
"%s exiting\n", argv[0]);
2202
}
2203
2204
/* Cleanup things */
2205
if(sb != NULL)
2206
avahi_s_service_browser_free(sb);
2207
2208
if(mc.server != NULL)
2209
avahi_server_free(mc.server);
2210
2211
if(mc.simple_poll != NULL)
2212
avahi_simple_poll_free(mc.simple_poll);
2213
2214
if(gnutls_initialized){
2215
gnutls_certificate_free_credentials(mc.cred);
2216
gnutls_global_deinit();
2217
gnutls_dh_params_deinit(mc.dh_params);
2218
}
2219
2220
if(gpgme_initialized){
2221
gpgme_release(mc.ctx);
2222
}
2223
2224
/* Cleans up the circular linked list of Mandos servers the client
2225
has seen */
2226
if(mc.current_server != NULL){
2227
mc.current_server->prev->next = NULL;
2228
while(mc.current_server != NULL){
2229
server *next = mc.current_server->next;
2230
free(mc.current_server);
2231
mc.current_server = next;
2232
}
2233
}
2234
2235
/* XXX run network hooks "stop" here */
2236
2237
/* Take down the network interface */
2238
if(take_down_interface){
2239
/* Re-raise priviliges */
2240
errno = 0;
2241
ret = seteuid(0);
2242
if(ret == -1){
2243
perror_plus("seteuid");
2244
}
2245
if(geteuid() == 0){
2246
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2247
if(ret == -1){
2248
perror_plus("ioctl SIOCGIFFLAGS");
2249
} else if(network.ifr_flags & IFF_UP){
2250
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2251
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2252
if(ret == -1){
2253
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2254
}
2255
}
2256
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2257
if(ret == -1){
2258
perror_plus("close");
2259
}
2260
/* Lower privileges permanently */
2261
errno = 0;
2262
ret = setuid(uid);
2263
if(ret == -1){
2264
perror_plus("setuid");
2265
}
2266
}
2267
}
2268
2269
/* Removes the GPGME temp directory and all files inside */
2270
if(tempdir_created){
2271
struct dirent **direntries = NULL;
2272
struct dirent *direntry = NULL;
2273
int numentries = scandir(tempdir, &direntries, notdotentries,
2274
alphasort);
2275
if (numentries > 0){
2276
for(int i = 0; i < numentries; i++){
2277
direntry = direntries[i];
2278
char *fullname = NULL;
2279
ret = asprintf(&fullname, "%s/%s", tempdir,
2280
direntry->d_name);
2281
if(ret < 0){
2282
perror_plus("asprintf");
2283
continue;
2284
}
2285
ret = remove(fullname);
2286
if(ret == -1){
2287
fprintf(stderr, "Mandos plugin mandos-client: "
2288
"remove(\"%s\"): %s\n", fullname, strerror(errno));
2289
}
2290
free(fullname);
2291
}
2292
}
2293
2294
/* need to clean even if 0 because man page doesn't specify */
2295
free(direntries);
2296
if (numentries == -1){
2297
perror_plus("scandir");
2298
}
2299
ret = rmdir(tempdir);
2300
if(ret == -1 and errno != ENOENT){
2301
perror_plus("rmdir");
2302
}
2303
}
2304
2305
if(quit_now){
2306
sigemptyset(&old_sigterm_action.sa_mask);
2307
old_sigterm_action.sa_handler = SIG_DFL;
2308
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2309
&old_sigterm_action,
2310
NULL));
2311
if(ret == -1){
2312
perror_plus("sigaction");
2313
}
2314
do {
2315
ret = raise(signal_received);
2316
} while(ret != 0 and errno == EINTR);
2317
if(ret != 0){
2318
perror_plus("raise");
2319
abort();
2320
}
2321
TEMP_FAILURE_RETRY(pause());
2322
}
2323
2324
return exitcode;
1032
1033
if (debug){
1034
fprintf(stderr, "%s exiting\n", argv[0]);
1035
}
1036
1037
/* Cleanup things */
1038
if (sb != NULL)
1039
avahi_s_service_browser_free(sb);
1040
1041
if (mc.server != NULL)
1042
avahi_server_free(mc.server);
1043
1044
if (mc.simple_poll != NULL)
1045
avahi_simple_poll_free(mc.simple_poll);
1046
free(pubkeyfile);
1047
free(seckeyfile);
1048
1049
if (gnutls_initalized){
1050
gnutls_certificate_free_credentials(mc.cred);
1051
gnutls_global_deinit ();
1052
}
1053
1054
return exitcode;
2325
1055
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0