To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/release
« back to all changes in this revision
Viewing changes to plugins.d/mandos-client.c
- browse files at revision 237.7.81
- compare with another revision
- download diff
- download tarball
- view history from revision 237.7.81
- Committer: teddy at bsnet
- Date: 2011-12-24 23:17:02 UTC
- mto: (237.7.89 trunk) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 290.
- Revision ID: teddy@fukt.bsnet.se-20111224231702-1ffgu6r02p0bz9co
* plugins.d/splashy.c (error_plus): Check format string.
* plugins.d/askpass-fifo.c (error_plus): - '' -
* plugins.d/plymouth.c (error_plus): - '' -
* plugins.d/password-prompt.c (error_plus): - '' -
* plugins.d/usplash.c (error_plus): - '' -
* plugins.d/askpass-fifo.c (error_plus): - '' -
* plugins.d/plymouth.c (error_plus): - '' -
* plugins.d/password-prompt.c (error_plus): - '' -
* plugins.d/usplash.c (error_plus): - '' -
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- network-hooks.d
- files removed:
- etc-plugins.d-README
- files renamed:
- plugins.d/password-request.c => plugins.d/mandos-client.c
- plugins.d/password-request.xml => plugins.d/mandos-client.xml
- 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(), _exit() */
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
#include <grp.h> /* setgroups() */
91
92
#ifdef __linux__
93
#include <sys/klog.h> /* klogctl() */
94
#endif /* __linux__ */
74
95
75
96
/* Avahi */
76
97
/* All Avahi types, constants and functions
89
110
gnutls_*
90
111
init_gnutls_session(),
91
112
GNUTLS_* */
92
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
93
GNUTLS_OPENPGP_FMT_BASE64 */
113
#include <gnutls/openpgp.h>
114
/* gnutls_certificate_set_openpgp_key_file(),
115
GNUTLS_OPENPGP_FMT_BASE64 */
94
116
95
117
/* GPGME */
96
118
#include <gpgme.h> /* All GPGME types, constants and
101
123
102
124
#define BUFFER_SIZE 256
103
125
104
/*
105
#define PATHDIR "/conf/conf.d/mandos"
106
*/
107
108
126
#define PATHDIR "/conf/conf.d/mandos"
109
127
#define SECKEY "seckey.txt"
110
128
#define PUBKEY "pubkey.txt"
129
#define HOOKDIR "/lib/mandos/network-hooks.d"
111
130
112
131
bool debug = false;
113
132
static const char mandos_protocol_version[] = "1";
114
const char *argp_program_version = "password-request 1.0";
115
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
133
const char *argp_program_version = "mandos-client " VERSION;
134
const char *argp_program_bug_address = "<mandos@recompile.se>";
135
static const char sys_class_net[] = "/sys/class/net";
136
char *connect_to = NULL;
137
const char *hookdir = HOOKDIR;
138
139
/* Doubly linked list that need to be circularly linked when used */
140
typedef struct server{
141
const char *ip;
142
uint16_t port;
143
AvahiIfIndex if_index;
144
int af;
145
struct timespec last_seen;
146
struct server *next;
147
struct server *prev;
148
} server;
116
149
117
150
/* Used for passing in values through the Avahi callback functions */
118
151
typedef struct {
123
156
gnutls_dh_params_t dh_params;
124
157
const char *priority;
125
158
gpgme_ctx_t ctx;
159
server *current_server;
126
160
} mandos_context;
127
161
162
/* global context so signal handler can reach it*/
163
mandos_context mc = { .simple_poll = NULL, .server = NULL,
164
.dh_bits = 1024, .priority = "SECURE256"
165
":!CTYPE-X.509:+CTYPE-OPENPGP",
166
.current_server = NULL };
167
168
sig_atomic_t quit_now = 0;
169
int signal_received = 0;
170
171
/* Function to use when printing errors */
172
void perror_plus(const char *print_text){
173
fprintf(stderr, "Mandos plugin %s: ",
174
program_invocation_short_name);
175
perror(print_text);
176
}
177
178
__attribute__((format (gnu_printf, 2, 3)))
179
int fprintf_plus(FILE *stream, const char *format, ...){
180
va_list ap;
181
va_start (ap, format);
182
183
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
184
program_invocation_short_name));
185
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
186
}
187
128
188
/*
129
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
130
* "buffer_capacity" is how much is currently allocated,
189
* Make additional room in "buffer" for at least BUFFER_SIZE more
190
* bytes. "buffer_capacity" is how much is currently allocated,
131
191
* "buffer_length" is how much is already used.
132
192
*/
133
size_t adjustbuffer(char **buffer, size_t buffer_length,
134
size_t buffer_capacity){
135
if (buffer_length + BUFFER_SIZE > buffer_capacity){
193
size_t incbuffer(char **buffer, size_t buffer_length,
194
size_t buffer_capacity){
195
if(buffer_length + BUFFER_SIZE > buffer_capacity){
136
196
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
137
if (buffer == NULL){
197
if(buffer == NULL){
138
198
return 0;
139
199
}
140
200
buffer_capacity += BUFFER_SIZE;
142
202
return buffer_capacity;
143
203
}
144
204
205
/* Add server to set of servers to retry periodically */
206
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
207
int af){
208
int ret;
209
server *new_server = malloc(sizeof(server));
210
if(new_server == NULL){
211
perror_plus("malloc");
212
return false;
213
}
214
*new_server = (server){ .ip = strdup(ip),
215
.port = port,
216
.if_index = if_index,
217
.af = af };
218
if(new_server->ip == NULL){
219
perror_plus("strdup");
220
return false;
221
}
222
/* Special case of first server */
223
if (mc.current_server == NULL){
224
new_server->next = new_server;
225
new_server->prev = new_server;
226
mc.current_server = new_server;
227
/* Place the new server last in the list */
228
} else {
229
new_server->next = mc.current_server;
230
new_server->prev = mc.current_server->prev;
231
new_server->prev->next = new_server;
232
mc.current_server->prev = new_server;
233
}
234
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
235
if(ret == -1){
236
perror_plus("clock_gettime");
237
return false;
238
}
239
return true;
240
}
241
145
242
/*
146
243
* Initialize GPGME.
147
244
*/
148
static bool init_gpgme(mandos_context *mc, const char *seckey,
149
const char *pubkey, const char *tempdir){
150
int ret;
245
static bool init_gpgme(const char *seckey, const char *pubkey,
246
const char *tempdir){
151
247
gpgme_error_t rc;
152
248
gpgme_engine_info_t engine_info;
153
249
154
250
155
251
/*
156
* Helper function to insert pub and seckey to the enigne keyring.
252
* Helper function to insert pub and seckey to the engine keyring.
157
253
*/
158
254
bool import_key(const char *filename){
255
int ret;
159
256
int fd;
160
257
gpgme_data_t pgp_data;
161
258
162
fd = TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
259
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
163
260
if(fd == -1){
164
perror("open");
261
perror_plus("open");
165
262
return false;
166
263
}
167
264
168
265
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));
266
if(rc != GPG_ERR_NO_ERROR){
267
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
268
gpgme_strsource(rc), gpgme_strerror(rc));
269
return false;
270
}
271
272
rc = gpgme_op_import(mc.ctx, pgp_data);
273
if(rc != GPG_ERR_NO_ERROR){
274
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
275
gpgme_strsource(rc), gpgme_strerror(rc));
276
return false;
277
}
278
279
ret = (int)TEMP_FAILURE_RETRY(close(fd));
183
280
if(ret == -1){
184
perror("close");
281
perror_plus("close");
185
282
}
186
283
gpgme_data_release(pgp_data);
187
284
return true;
188
285
}
189
286
190
if (debug){
191
fprintf(stderr, "Initialize gpgme\n");
287
if(debug){
288
fprintf_plus(stderr, "Initializing GPGME\n");
192
289
}
193
290
194
291
/* Init GPGME */
195
292
gpgme_check_version(NULL);
196
293
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",
199
gpgme_strsource(rc), gpgme_strerror(rc));
294
if(rc != GPG_ERR_NO_ERROR){
295
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
296
gpgme_strsource(rc), gpgme_strerror(rc));
200
297
return false;
201
298
}
202
299
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",
207
gpgme_strsource(rc), gpgme_strerror(rc));
300
/* Set GPGME home directory for the OpenPGP engine only */
301
rc = gpgme_get_engine_info(&engine_info);
302
if(rc != GPG_ERR_NO_ERROR){
303
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
304
gpgme_strsource(rc), gpgme_strerror(rc));
208
305
return false;
209
306
}
210
307
while(engine_info != NULL){
216
313
engine_info = engine_info->next;
217
314
}
218
315
if(engine_info == NULL){
219
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
316
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
317
tempdir);
220
318
return false;
221
319
}
222
320
223
321
/* 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;
322
rc = gpgme_new(&(mc.ctx));
323
if(rc != GPG_ERR_NO_ERROR){
324
fprintf_plus(stderr, "Mandos plugin mandos-client: "
325
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
326
gpgme_strerror(rc));
327
return false;
328
}
329
330
if(not import_key(pubkey) or not import_key(seckey)){
331
return false;
332
}
333
334
return true;
236
335
}
237
336
238
337
/*
239
338
* Decrypt OpenPGP data.
240
339
* Returns -1 on error
241
340
*/
242
static ssize_t pgp_packet_decrypt (const mandos_context *mc,
243
const char *cryptotext,
244
size_t crypto_size,
245
char **plaintext){
341
static ssize_t pgp_packet_decrypt(const char *cryptotext,
342
size_t crypto_size,
343
char **plaintext){
246
344
gpgme_data_t dh_crypto, dh_plain;
247
345
gpgme_error_t rc;
248
346
ssize_t ret;
249
347
size_t plaintext_capacity = 0;
250
348
ssize_t plaintext_length = 0;
251
349
252
if (debug){
253
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
350
if(debug){
351
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
254
352
}
255
353
256
354
/* Create new GPGME data buffer from memory cryptotext */
257
355
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
258
356
0);
259
if (rc != GPG_ERR_NO_ERROR){
260
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
261
gpgme_strsource(rc), gpgme_strerror(rc));
357
if(rc != GPG_ERR_NO_ERROR){
358
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
359
gpgme_strsource(rc), gpgme_strerror(rc));
262
360
return -1;
263
361
}
264
362
265
363
/* Create new empty GPGME data buffer for the plaintext */
266
364
rc = gpgme_data_new(&dh_plain);
267
if (rc != GPG_ERR_NO_ERROR){
268
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
269
gpgme_strsource(rc), gpgme_strerror(rc));
365
if(rc != GPG_ERR_NO_ERROR){
366
fprintf_plus(stderr, "Mandos plugin mandos-client: "
367
"bad gpgme_data_new: %s: %s\n",
368
gpgme_strsource(rc), gpgme_strerror(rc));
270
369
gpgme_data_release(dh_crypto);
271
370
return -1;
272
371
}
273
372
274
373
/* Decrypt data from the cryptotext data buffer to the plaintext
275
374
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",
279
gpgme_strsource(rc), gpgme_strerror(rc));
375
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
376
if(rc != GPG_ERR_NO_ERROR){
377
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
378
gpgme_strsource(rc), gpgme_strerror(rc));
280
379
plaintext_length = -1;
281
if (debug){
380
if(debug){
282
381
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");
382
result = gpgme_op_decrypt_result(mc.ctx);
383
if(result == NULL){
384
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
286
385
} else {
287
fprintf(stderr, "Unsupported algorithm: %s\n",
288
result->unsupported_algorithm);
289
fprintf(stderr, "Wrong key usage: %u\n",
290
result->wrong_key_usage);
386
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
387
result->unsupported_algorithm);
388
fprintf_plus(stderr, "Wrong key usage: %u\n",
389
result->wrong_key_usage);
291
390
if(result->file_name != NULL){
292
fprintf(stderr, "File name: %s\n", result->file_name);
391
fprintf_plus(stderr, "File name: %s\n", result->file_name);
293
392
}
294
393
gpgme_recipient_t recipient;
295
394
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
}
395
while(recipient != NULL){
396
fprintf_plus(stderr, "Public key algorithm: %s\n",
397
gpgme_pubkey_algo_name
398
(recipient->pubkey_algo));
399
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
400
fprintf_plus(stderr, "Secret key available: %s\n",
401
recipient->status == GPG_ERR_NO_SECKEY
402
? "No" : "Yes");
403
recipient = recipient->next;
306
404
}
307
405
}
308
406
}
310
408
}
311
409
312
410
if(debug){
313
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
411
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
314
412
}
315
413
316
414
/* 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("pgpme_data_seek");
415
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
416
perror_plus("gpgme_data_seek");
319
417
plaintext_length = -1;
320
418
goto decrypt_end;
321
419
}
322
420
323
421
*plaintext = NULL;
324
422
while(true){
325
plaintext_capacity = adjustbuffer(plaintext,
326
(size_t)plaintext_length,
327
plaintext_capacity);
328
if (plaintext_capacity == 0){
329
perror("adjustbuffer");
330
plaintext_length = -1;
331
goto decrypt_end;
423
plaintext_capacity = incbuffer(plaintext,
424
(size_t)plaintext_length,
425
plaintext_capacity);
426
if(plaintext_capacity == 0){
427
perror_plus("incbuffer");
428
plaintext_length = -1;
429
goto decrypt_end;
332
430
}
333
431
334
432
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
335
433
BUFFER_SIZE);
336
434
/* Print the data, if any */
337
if (ret == 0){
435
if(ret == 0){
338
436
/* EOF */
339
437
break;
340
438
}
341
439
if(ret < 0){
342
perror("gpgme_data_read");
440
perror_plus("gpgme_data_read");
343
441
plaintext_length = -1;
344
442
goto decrypt_end;
345
443
}
347
445
}
348
446
349
447
if(debug){
350
fprintf(stderr, "Decrypted password is: ");
448
fprintf_plus(stderr, "Decrypted password is: ");
351
449
for(ssize_t i = 0; i < plaintext_length; i++){
352
450
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
353
451
}
364
462
return plaintext_length;
365
463
}
366
464
367
static const char * safer_gnutls_strerror (int value) {
368
const char *ret = gnutls_strerror (value); /* Spurious warning */
369
if (ret == NULL)
465
static const char * safer_gnutls_strerror(int value){
466
const char *ret = gnutls_strerror(value); /* Spurious warning from
467
-Wunreachable-code */
468
if(ret == NULL)
370
469
ret = "(unknown)";
371
470
return ret;
372
471
}
374
473
/* GnuTLS log function callback */
375
474
static void debuggnutls(__attribute__((unused)) int level,
376
475
const char* string){
377
fprintf(stderr, "GnuTLS: %s", string);
476
fprintf_plus(stderr, "GnuTLS: %s", string);
378
477
}
379
478
380
static int init_gnutls_global(mandos_context *mc,
381
const char *pubkeyfilename,
479
static int init_gnutls_global(const char *pubkeyfilename,
382
480
const char *seckeyfilename){
383
481
int ret;
384
482
385
483
if(debug){
386
fprintf(stderr, "Initializing GnuTLS\n");
484
fprintf_plus(stderr, "Initializing GnuTLS\n");
387
485
}
388
486
389
487
ret = gnutls_global_init();
390
if (ret != GNUTLS_E_SUCCESS) {
391
fprintf (stderr, "GnuTLS global_init: %s\n",
392
safer_gnutls_strerror(ret));
488
if(ret != GNUTLS_E_SUCCESS){
489
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
490
safer_gnutls_strerror(ret));
393
491
return -1;
394
492
}
395
493
396
if (debug){
494
if(debug){
397
495
/* "Use a log level over 10 to enable all debugging options."
398
496
* - GnuTLS manual
399
497
*/
402
500
}
403
501
404
502
/* 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 ();
503
ret = gnutls_certificate_allocate_credentials(&mc.cred);
504
if(ret != GNUTLS_E_SUCCESS){
505
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
506
safer_gnutls_strerror(ret));
507
gnutls_global_deinit();
411
508
return -1;
412
509
}
413
510
414
511
if(debug){
415
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
416
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
417
seckeyfilename);
512
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
513
" secret key %s as GnuTLS credentials\n",
514
pubkeyfilename,
515
seckeyfilename);
418
516
}
419
517
420
518
ret = gnutls_certificate_set_openpgp_key_file
421
(mc->cred, pubkeyfilename, seckeyfilename,
519
(mc.cred, pubkeyfilename, seckeyfilename,
422
520
GNUTLS_OPENPGP_FMT_BASE64);
423
if (ret != GNUTLS_E_SUCCESS) {
424
fprintf(stderr,
425
"Error[%d] while reading the OpenPGP key pair ('%s',"
426
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
427
fprintf(stderr, "The GnuTLS error is: %s\n",
428
safer_gnutls_strerror(ret));
521
if(ret != GNUTLS_E_SUCCESS){
522
fprintf_plus(stderr,
523
"Error[%d] while reading the OpenPGP key pair ('%s',"
524
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
525
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
526
safer_gnutls_strerror(ret));
429
527
goto globalfail;
430
528
}
431
529
432
530
/* 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));
531
ret = gnutls_dh_params_init(&mc.dh_params);
532
if(ret != GNUTLS_E_SUCCESS){
533
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
534
" initialization: %s\n",
535
safer_gnutls_strerror(ret));
437
536
goto globalfail;
438
537
}
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));
538
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
539
if(ret != GNUTLS_E_SUCCESS){
540
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
541
safer_gnutls_strerror(ret));
443
542
goto globalfail;
444
543
}
445
544
446
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
545
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
447
546
448
547
return 0;
449
548
450
549
globalfail:
451
550
452
gnutls_certificate_free_credentials(mc->cred);
551
gnutls_certificate_free_credentials(mc.cred);
453
552
gnutls_global_deinit();
553
gnutls_dh_params_deinit(mc.dh_params);
454
554
return -1;
455
555
}
456
556
457
static int init_gnutls_session(mandos_context *mc,
458
gnutls_session_t *session){
557
static int init_gnutls_session(gnutls_session_t *session){
459
558
int ret;
460
559
/* GnuTLS session creation */
461
ret = gnutls_init(session, GNUTLS_SERVER);
462
if (ret != GNUTLS_E_SUCCESS){
463
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
464
safer_gnutls_strerror(ret));
560
do {
561
ret = gnutls_init(session, GNUTLS_SERVER);
562
if(quit_now){
563
return -1;
564
}
565
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
566
if(ret != GNUTLS_E_SUCCESS){
567
fprintf_plus(stderr,
568
"Error in GnuTLS session initialization: %s\n",
569
safer_gnutls_strerror(ret));
465
570
}
466
571
467
572
{
468
573
const char *err;
469
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
470
if (ret != GNUTLS_E_SUCCESS) {
471
fprintf(stderr, "Syntax error at: %s\n", err);
472
fprintf(stderr, "GnuTLS error: %s\n",
473
safer_gnutls_strerror(ret));
474
gnutls_deinit (*session);
574
do {
575
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
576
if(quit_now){
577
gnutls_deinit(*session);
578
return -1;
579
}
580
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
581
if(ret != GNUTLS_E_SUCCESS){
582
fprintf_plus(stderr, "Syntax error at: %s\n", err);
583
fprintf_plus(stderr, "GnuTLS error: %s\n",
584
safer_gnutls_strerror(ret));
585
gnutls_deinit(*session);
475
586
return -1;
476
587
}
477
588
}
478
589
479
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
480
mc->cred);
481
if (ret != GNUTLS_E_SUCCESS) {
482
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
483
safer_gnutls_strerror(ret));
484
gnutls_deinit (*session);
590
do {
591
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
592
mc.cred);
593
if(quit_now){
594
gnutls_deinit(*session);
595
return -1;
596
}
597
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
598
if(ret != GNUTLS_E_SUCCESS){
599
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
600
safer_gnutls_strerror(ret));
601
gnutls_deinit(*session);
485
602
return -1;
486
603
}
487
604
488
605
/* ignore client certificate if any. */
489
gnutls_certificate_server_set_request (*session,
490
GNUTLS_CERT_IGNORE);
606
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
491
607
492
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
608
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
493
609
494
610
return 0;
495
611
}
501
617
/* Called when a Mandos server is found */
502
618
static int start_mandos_communication(const char *ip, uint16_t port,
503
619
AvahiIfIndex if_index,
504
mandos_context *mc){
505
int ret, tcp_sd;
506
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
620
int af){
621
int ret, tcp_sd = -1;
622
ssize_t sret;
623
union {
624
struct sockaddr_in in;
625
struct sockaddr_in6 in6;
626
} to;
507
627
char *buffer = NULL;
508
char *decrypted_buffer;
628
char *decrypted_buffer = NULL;
509
629
size_t buffer_length = 0;
510
630
size_t buffer_capacity = 0;
511
ssize_t decrypted_buffer_size;
512
631
size_t written;
513
int retval = 0;
514
char interface[IF_NAMESIZE];
632
int retval = -1;
515
633
gnutls_session_t session;
516
517
ret = init_gnutls_session (mc, &session);
518
if (ret != 0){
519
return -1;
520
}
521
522
if(debug){
523
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
524
"\n", ip, port);
525
}
526
527
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
528
if(tcp_sd < 0) {
529
perror("socket");
530
return -1;
531
}
532
533
if(debug){
534
if(if_indextoname((unsigned int)if_index, interface) == NULL){
535
perror("if_indextoname");
536
return -1;
537
}
538
fprintf(stderr, "Binding to interface %s\n", interface);
634
int pf; /* Protocol family */
635
636
errno = 0;
637
638
if(quit_now){
639
errno = EINTR;
640
return -1;
641
}
642
643
switch(af){
644
case AF_INET6:
645
pf = PF_INET6;
646
break;
647
case AF_INET:
648
pf = PF_INET;
649
break;
650
default:
651
fprintf_plus(stderr, "Bad address family: %d\n", af);
652
errno = EINVAL;
653
return -1;
654
}
655
656
ret = init_gnutls_session(&session);
657
if(ret != 0){
658
return -1;
659
}
660
661
if(debug){
662
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
663
PRIu16 "\n", ip, port);
664
}
665
666
tcp_sd = socket(pf, SOCK_STREAM, 0);
667
if(tcp_sd < 0){
668
int e = errno;
669
perror_plus("socket");
670
errno = e;
671
goto mandos_end;
672
}
673
674
if(quit_now){
675
errno = EINTR;
676
goto mandos_end;
539
677
}
540
678
541
679
memset(&to, 0, sizeof(to));
542
to.in6.sin6_family = AF_INET6;
543
/* It would be nice to have a way to detect if we were passed an
544
IPv4 address here. Now we assume an IPv6 address. */
545
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
546
if (ret < 0 ){
547
perror("inet_pton");
548
return -1;
680
if(af == AF_INET6){
681
to.in6.sin6_family = (sa_family_t)af;
682
ret = inet_pton(af, ip, &to.in6.sin6_addr);
683
} else { /* IPv4 */
684
to.in.sin_family = (sa_family_t)af;
685
ret = inet_pton(af, ip, &to.in.sin_addr);
686
}
687
if(ret < 0 ){
688
int e = errno;
689
perror_plus("inet_pton");
690
errno = e;
691
goto mandos_end;
549
692
}
550
693
if(ret == 0){
551
fprintf(stderr, "Bad address: %s\n", ip);
552
return -1;
553
}
554
to.in6.sin6_port = htons(port); /* Spurious warning */
694
int e = errno;
695
fprintf_plus(stderr, "Bad address: %s\n", ip);
696
errno = e;
697
goto mandos_end;
698
}
699
if(af == AF_INET6){
700
to.in6.sin6_port = htons(port); /* Spurious warnings from
701
-Wconversion and
702
-Wunreachable-code */
703
704
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
705
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
706
-Wunreachable-code*/
707
if(if_index == AVAHI_IF_UNSPEC){
708
fprintf_plus(stderr, "An IPv6 link-local address is"
709
" incomplete without a network interface\n");
710
errno = EINVAL;
711
goto mandos_end;
712
}
713
/* Set the network interface number as scope */
714
to.in6.sin6_scope_id = (uint32_t)if_index;
715
}
716
} else {
717
to.in.sin_port = htons(port); /* Spurious warnings from
718
-Wconversion and
719
-Wunreachable-code */
720
}
555
721
556
to.in6.sin6_scope_id = (uint32_t)if_index;
722
if(quit_now){
723
errno = EINTR;
724
goto mandos_end;
725
}
557
726
558
727
if(debug){
559
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
560
port);
561
char addrstr[INET6_ADDRSTRLEN] = "";
562
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
563
sizeof(addrstr)) == NULL){
564
perror("inet_ntop");
728
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
729
char interface[IF_NAMESIZE];
730
if(if_indextoname((unsigned int)if_index, interface) == NULL){
731
perror_plus("if_indextoname");
732
} else {
733
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
734
"\n", ip, interface, port);
735
}
736
} else {
737
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
738
ip, port);
739
}
740
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
741
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
742
const char *pcret;
743
if(af == AF_INET6){
744
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
745
sizeof(addrstr));
746
} else {
747
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
748
sizeof(addrstr));
749
}
750
if(pcret == NULL){
751
perror_plus("inet_ntop");
565
752
} else {
566
753
if(strcmp(addrstr, ip) != 0){
567
fprintf(stderr, "Canonical address form: %s\n", addrstr);
754
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
568
755
}
569
756
}
570
757
}
571
758
572
ret = connect(tcp_sd, &to.in, sizeof(to));
573
if (ret < 0){
574
perror("connect");
575
return -1;
759
if(quit_now){
760
errno = EINTR;
761
goto mandos_end;
762
}
763
764
if(af == AF_INET6){
765
ret = connect(tcp_sd, &to.in6, sizeof(to));
766
} else {
767
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
768
}
769
if(ret < 0){
770
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
771
int e = errno;
772
perror_plus("connect");
773
errno = e;
774
}
775
goto mandos_end;
776
}
777
778
if(quit_now){
779
errno = EINTR;
780
goto mandos_end;
576
781
}
577
782
578
783
const char *out = mandos_protocol_version;
579
784
written = 0;
580
while (true){
785
while(true){
581
786
size_t out_size = strlen(out);
582
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
583
out_size - written));
584
if (ret == -1){
585
perror("write");
586
retval = -1;
787
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
788
out_size - written));
789
if(ret == -1){
790
int e = errno;
791
perror_plus("write");
792
errno = e;
587
793
goto mandos_end;
588
794
}
589
795
written += (size_t)ret;
590
796
if(written < out_size){
591
797
continue;
592
798
} else {
593
if (out == mandos_protocol_version){
799
if(out == mandos_protocol_version){
594
800
written = 0;
595
801
out = "\r\n";
596
802
} else {
597
803
break;
598
804
}
599
805
}
806
807
if(quit_now){
808
errno = EINTR;
809
goto mandos_end;
810
}
600
811
}
601
812
602
813
if(debug){
603
fprintf(stderr, "Establishing TLS session with %s\n", ip);
604
}
605
606
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
607
608
do{
609
ret = gnutls_handshake (session);
814
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
815
}
816
817
if(quit_now){
818
errno = EINTR;
819
goto mandos_end;
820
}
821
822
/* Spurious warning from -Wint-to-pointer-cast */
823
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
824
825
if(quit_now){
826
errno = EINTR;
827
goto mandos_end;
828
}
829
830
do {
831
ret = gnutls_handshake(session);
832
if(quit_now){
833
errno = EINTR;
834
goto mandos_end;
835
}
610
836
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
611
837
612
if (ret != GNUTLS_E_SUCCESS){
838
if(ret != GNUTLS_E_SUCCESS){
613
839
if(debug){
614
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
615
gnutls_perror (ret);
840
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
841
gnutls_perror(ret);
616
842
}
617
retval = -1;
843
errno = EPROTO;
618
844
goto mandos_end;
619
845
}
620
846
621
847
/* Read OpenPGP packet that contains the wanted password */
622
848
623
849
if(debug){
624
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
625
ip);
850
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
851
" %s\n", ip);
626
852
}
627
853
628
854
while(true){
629
buffer_capacity = adjustbuffer(&buffer, buffer_length,
630
buffer_capacity);
631
if (buffer_capacity == 0){
632
perror("adjustbuffer");
633
retval = -1;
634
goto mandos_end;
635
}
636
637
ret = gnutls_record_recv(session, buffer+buffer_length,
638
BUFFER_SIZE);
639
if (ret == 0){
855
856
if(quit_now){
857
errno = EINTR;
858
goto mandos_end;
859
}
860
861
buffer_capacity = incbuffer(&buffer, buffer_length,
862
buffer_capacity);
863
if(buffer_capacity == 0){
864
int e = errno;
865
perror_plus("incbuffer");
866
errno = e;
867
goto mandos_end;
868
}
869
870
if(quit_now){
871
errno = EINTR;
872
goto mandos_end;
873
}
874
875
sret = gnutls_record_recv(session, buffer+buffer_length,
876
BUFFER_SIZE);
877
if(sret == 0){
640
878
break;
641
879
}
642
if (ret < 0){
643
switch(ret){
880
if(sret < 0){
881
switch(sret){
644
882
case GNUTLS_E_INTERRUPTED:
645
883
case GNUTLS_E_AGAIN:
646
884
break;
647
885
case GNUTLS_E_REHANDSHAKE:
648
do{
649
ret = gnutls_handshake (session);
886
do {
887
ret = gnutls_handshake(session);
888
889
if(quit_now){
890
errno = EINTR;
891
goto mandos_end;
892
}
650
893
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
651
if (ret < 0){
652
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
653
gnutls_perror (ret);
654
retval = -1;
894
if(ret < 0){
895
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
896
"***\n");
897
gnutls_perror(ret);
898
errno = EPROTO;
655
899
goto mandos_end;
656
900
}
657
901
break;
658
902
default:
659
fprintf(stderr, "Unknown error while reading data from"
660
" encrypted session with Mandos server\n");
661
retval = -1;
662
gnutls_bye (session, GNUTLS_SHUT_RDWR);
903
fprintf_plus(stderr, "Unknown error while reading data from"
904
" encrypted session with Mandos server\n");
905
gnutls_bye(session, GNUTLS_SHUT_RDWR);
906
errno = EIO;
663
907
goto mandos_end;
664
908
}
665
909
} else {
666
buffer_length += (size_t) ret;
910
buffer_length += (size_t) sret;
667
911
}
668
912
}
669
913
670
914
if(debug){
671
fprintf(stderr, "Closing TLS session\n");
672
}
673
674
gnutls_bye (session, GNUTLS_SHUT_RDWR);
675
676
if (buffer_length > 0){
677
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
678
buffer_length,
915
fprintf_plus(stderr, "Closing TLS session\n");
916
}
917
918
if(quit_now){
919
errno = EINTR;
920
goto mandos_end;
921
}
922
923
do {
924
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
925
if(quit_now){
926
errno = EINTR;
927
goto mandos_end;
928
}
929
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
930
931
if(buffer_length > 0){
932
ssize_t decrypted_buffer_size;
933
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
679
934
&decrypted_buffer);
680
if (decrypted_buffer_size >= 0){
935
if(decrypted_buffer_size >= 0){
936
681
937
written = 0;
682
938
while(written < (size_t) decrypted_buffer_size){
683
ret = (int)fwrite (decrypted_buffer + written, 1,
684
(size_t)decrypted_buffer_size - written,
685
stdout);
939
if(quit_now){
940
errno = EINTR;
941
goto mandos_end;
942
}
943
944
ret = (int)fwrite(decrypted_buffer + written, 1,
945
(size_t)decrypted_buffer_size - written,
946
stdout);
686
947
if(ret == 0 and ferror(stdout)){
948
int e = errno;
687
949
if(debug){
688
fprintf(stderr, "Error writing encrypted data: %s\n",
689
strerror(errno));
950
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
951
strerror(errno));
690
952
}
691
retval = -1;
692
break;
953
errno = e;
954
goto mandos_end;
693
955
}
694
956
written += (size_t)ret;
695
957
}
696
free(decrypted_buffer);
697
} else {
698
retval = -1;
958
retval = 0;
699
959
}
700
} else {
701
retval = -1;
702
960
}
703
961
704
962
/* Shutdown procedure */
705
963
706
964
mandos_end:
707
free(buffer);
708
ret = TEMP_FAILURE_RETRY(close(tcp_sd));
709
if(ret == -1){
710
perror("close");
965
{
966
int e = errno;
967
free(decrypted_buffer);
968
free(buffer);
969
if(tcp_sd >= 0){
970
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
971
}
972
if(ret == -1){
973
if(e == 0){
974
e = errno;
975
}
976
perror_plus("close");
977
}
978
gnutls_deinit(session);
979
errno = e;
980
if(quit_now){
981
errno = EINTR;
982
retval = -1;
983
}
711
984
}
712
gnutls_deinit (session);
713
985
return retval;
714
986
}
715
987
716
988
static void resolve_callback(AvahiSServiceResolver *r,
717
989
AvahiIfIndex interface,
718
AVAHI_GCC_UNUSED AvahiProtocol protocol,
990
AvahiProtocol proto,
719
991
AvahiResolverEvent event,
720
992
const char *name,
721
993
const char *type,
726
998
AVAHI_GCC_UNUSED AvahiStringList *txt,
727
999
AVAHI_GCC_UNUSED AvahiLookupResultFlags
728
1000
flags,
729
void* userdata) {
730
mandos_context *mc = userdata;
1001
AVAHI_GCC_UNUSED void* userdata){
731
1002
assert(r);
732
1003
733
1004
/* Called whenever a service has been resolved successfully or
734
1005
timed out */
735
1006
736
switch (event) {
1007
if(quit_now){
1008
return;
1009
}
1010
1011
switch(event){
737
1012
default:
738
1013
case AVAHI_RESOLVER_FAILURE:
739
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
740
" of type '%s' in domain '%s': %s\n", name, type, domain,
741
avahi_strerror(avahi_server_errno(mc->server)));
1014
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1015
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1016
domain,
1017
avahi_strerror(avahi_server_errno(mc.server)));
742
1018
break;
743
1019
744
1020
case AVAHI_RESOLVER_FOUND:
746
1022
char ip[AVAHI_ADDRESS_STR_MAX];
747
1023
avahi_address_snprint(ip, sizeof(ip), address);
748
1024
if(debug){
749
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
750
PRIu16 ") on port %d\n", name, host_name, ip,
751
interface, port);
1025
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1026
PRIdMAX ") on port %" PRIu16 "\n", name,
1027
host_name, ip, (intmax_t)interface, port);
752
1028
}
753
int ret = start_mandos_communication(ip, port, interface, mc);
754
if (ret == 0){
755
avahi_simple_poll_quit(mc->simple_poll);
1029
int ret = start_mandos_communication(ip, port, interface,
1030
avahi_proto_to_af(proto));
1031
if(ret == 0){
1032
avahi_simple_poll_quit(mc.simple_poll);
1033
} else {
1034
if(not add_server(ip, port, interface,
1035
avahi_proto_to_af(proto))){
1036
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1037
" list\n", name);
1038
}
756
1039
}
757
1040
}
758
1041
}
759
1042
avahi_s_service_resolver_free(r);
760
1043
}
761
1044
762
static void browse_callback( AvahiSServiceBrowser *b,
763
AvahiIfIndex interface,
764
AvahiProtocol protocol,
765
AvahiBrowserEvent event,
766
const char *name,
767
const char *type,
768
const char *domain,
769
AVAHI_GCC_UNUSED AvahiLookupResultFlags
770
flags,
771
void* userdata) {
772
mandos_context *mc = userdata;
1045
static void browse_callback(AvahiSServiceBrowser *b,
1046
AvahiIfIndex interface,
1047
AvahiProtocol protocol,
1048
AvahiBrowserEvent event,
1049
const char *name,
1050
const char *type,
1051
const char *domain,
1052
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1053
flags,
1054
AVAHI_GCC_UNUSED void* userdata){
773
1055
assert(b);
774
1056
775
1057
/* Called whenever a new services becomes available on the LAN or
776
1058
is removed from the LAN */
777
1059
778
switch (event) {
1060
if(quit_now){
1061
return;
1062
}
1063
1064
switch(event){
779
1065
default:
780
1066
case AVAHI_BROWSER_FAILURE:
781
1067
782
fprintf(stderr, "(Avahi browser) %s\n",
783
avahi_strerror(avahi_server_errno(mc->server)));
784
avahi_simple_poll_quit(mc->simple_poll);
1068
fprintf_plus(stderr, "(Avahi browser) %s\n",
1069
avahi_strerror(avahi_server_errno(mc.server)));
1070
avahi_simple_poll_quit(mc.simple_poll);
785
1071
return;
786
1072
787
1073
case AVAHI_BROWSER_NEW:
790
1076
the callback function is called the Avahi server will free the
791
1077
resolver for us. */
792
1078
793
if (!(avahi_s_service_resolver_new(mc->server, interface,
794
protocol, name, type, domain,
795
AVAHI_PROTO_INET6, 0,
796
resolve_callback, mc)))
797
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
798
name, avahi_strerror(avahi_server_errno(mc->server)));
1079
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1080
name, type, domain, protocol, 0,
1081
resolve_callback, NULL) == NULL)
1082
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1083
" %s\n", name,
1084
avahi_strerror(avahi_server_errno(mc.server)));
799
1085
break;
800
1086
801
1087
case AVAHI_BROWSER_REMOVE:
804
1090
case AVAHI_BROWSER_ALL_FOR_NOW:
805
1091
case AVAHI_BROWSER_CACHE_EXHAUSTED:
806
1092
if(debug){
807
fprintf(stderr, "No Mandos server found, still searching...\n");
1093
fprintf_plus(stderr, "No Mandos server found, still"
1094
" searching...\n");
808
1095
}
809
1096
break;
810
1097
}
811
1098
}
812
1099
1100
/* Signal handler that stops main loop after SIGTERM */
1101
static void handle_sigterm(int sig){
1102
if(quit_now){
1103
return;
1104
}
1105
quit_now = 1;
1106
signal_received = sig;
1107
int old_errno = errno;
1108
/* set main loop to exit */
1109
if(mc.simple_poll != NULL){
1110
avahi_simple_poll_quit(mc.simple_poll);
1111
}
1112
errno = old_errno;
1113
}
1114
1115
bool get_flags(const char *ifname, struct ifreq *ifr){
1116
int ret;
1117
1118
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1119
if(s < 0){
1120
perror_plus("socket");
1121
return false;
1122
}
1123
strcpy(ifr->ifr_name, ifname);
1124
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1125
if(ret == -1){
1126
if(debug){
1127
perror_plus("ioctl SIOCGIFFLAGS");
1128
}
1129
return false;
1130
}
1131
return true;
1132
}
1133
1134
bool good_flags(const char *ifname, const struct ifreq *ifr){
1135
1136
/* Reject the loopback device */
1137
if(ifr->ifr_flags & IFF_LOOPBACK){
1138
if(debug){
1139
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1140
ifname);
1141
}
1142
return false;
1143
}
1144
/* Accept point-to-point devices only if connect_to is specified */
1145
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1146
if(debug){
1147
fprintf_plus(stderr, "Accepting point-to-point interface"
1148
" \"%s\"\n", ifname);
1149
}
1150
return true;
1151
}
1152
/* Otherwise, reject non-broadcast-capable devices */
1153
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1154
if(debug){
1155
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1156
" \"%s\"\n", ifname);
1157
}
1158
return false;
1159
}
1160
/* Reject non-ARP interfaces (including dummy interfaces) */
1161
if(ifr->ifr_flags & IFF_NOARP){
1162
if(debug){
1163
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1164
ifname);
1165
}
1166
return false;
1167
}
1168
1169
/* Accept this device */
1170
if(debug){
1171
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1172
}
1173
return true;
1174
}
1175
1176
/*
1177
* This function determines if a directory entry in /sys/class/net
1178
* corresponds to an acceptable network device.
1179
* (This function is passed to scandir(3) as a filter function.)
1180
*/
1181
int good_interface(const struct dirent *if_entry){
1182
if(if_entry->d_name[0] == '.'){
1183
return 0;
1184
}
1185
1186
struct ifreq ifr;
1187
if(not get_flags(if_entry->d_name, &ifr)){
1188
if(debug){
1189
fprintf_plus(stderr, "Failed to get flags for interface "
1190
"\"%s\"\n", if_entry->d_name);
1191
}
1192
return 0;
1193
}
1194
1195
if(not good_flags(if_entry->d_name, &ifr)){
1196
return 0;
1197
}
1198
return 1;
1199
}
1200
1201
/*
1202
* This function determines if a directory entry in /sys/class/net
1203
* corresponds to an acceptable network device which is up.
1204
* (This function is passed to scandir(3) as a filter function.)
1205
*/
1206
int up_interface(const struct dirent *if_entry){
1207
if(if_entry->d_name[0] == '.'){
1208
return 0;
1209
}
1210
1211
struct ifreq ifr;
1212
if(not get_flags(if_entry->d_name, &ifr)){
1213
if(debug){
1214
fprintf_plus(stderr, "Failed to get flags for interface "
1215
"\"%s\"\n", if_entry->d_name);
1216
}
1217
return 0;
1218
}
1219
1220
/* Reject down interfaces */
1221
if(not (ifr.ifr_flags & IFF_UP)){
1222
if(debug){
1223
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1224
if_entry->d_name);
1225
}
1226
return 0;
1227
}
1228
1229
/* Reject non-running interfaces */
1230
if(not (ifr.ifr_flags & IFF_RUNNING)){
1231
if(debug){
1232
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1233
if_entry->d_name);
1234
}
1235
return 0;
1236
}
1237
1238
if(not good_flags(if_entry->d_name, &ifr)){
1239
return 0;
1240
}
1241
return 1;
1242
}
1243
1244
int notdotentries(const struct dirent *direntry){
1245
/* Skip "." and ".." */
1246
if(direntry->d_name[0] == '.'
1247
and (direntry->d_name[1] == '\0'
1248
or (direntry->d_name[1] == '.'
1249
and direntry->d_name[2] == '\0'))){
1250
return 0;
1251
}
1252
return 1;
1253
}
1254
1255
/* Is this directory entry a runnable program? */
1256
int runnable_hook(const struct dirent *direntry){
1257
int ret;
1258
size_t sret;
1259
struct stat st;
1260
1261
if((direntry->d_name)[0] == '\0'){
1262
/* Empty name? */
1263
return 0;
1264
}
1265
1266
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1267
"abcdefghijklmnopqrstuvwxyz"
1268
"0123456789"
1269
"_-");
1270
if((direntry->d_name)[sret] != '\0'){
1271
/* Contains non-allowed characters */
1272
if(debug){
1273
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1274
direntry->d_name);
1275
}
1276
return 0;
1277
}
1278
1279
char *fullname = NULL;
1280
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1281
if(ret < 0){
1282
perror_plus("asprintf");
1283
return 0;
1284
}
1285
1286
ret = stat(fullname, &st);
1287
if(ret == -1){
1288
if(debug){
1289
perror_plus("Could not stat hook");
1290
}
1291
return 0;
1292
}
1293
if(not (S_ISREG(st.st_mode))){
1294
/* Not a regular file */
1295
if(debug){
1296
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1297
direntry->d_name);
1298
}
1299
return 0;
1300
}
1301
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1302
/* Not executable */
1303
if(debug){
1304
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1305
direntry->d_name);
1306
}
1307
return 0;
1308
}
1309
if(debug){
1310
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1311
direntry->d_name);
1312
}
1313
return 1;
1314
}
1315
1316
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1317
int ret;
1318
struct timespec now;
1319
struct timespec waited_time;
1320
intmax_t block_time;
1321
1322
while(true){
1323
if(mc.current_server == NULL){
1324
if (debug){
1325
fprintf_plus(stderr, "Wait until first server is found."
1326
" No timeout!\n");
1327
}
1328
ret = avahi_simple_poll_iterate(s, -1);
1329
} else {
1330
if (debug){
1331
fprintf_plus(stderr, "Check current_server if we should run"
1332
" it, or wait\n");
1333
}
1334
/* the current time */
1335
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1336
if(ret == -1){
1337
perror_plus("clock_gettime");
1338
return -1;
1339
}
1340
/* Calculating in ms how long time between now and server
1341
who we visted longest time ago. Now - last seen. */
1342
waited_time.tv_sec = (now.tv_sec
1343
- mc.current_server->last_seen.tv_sec);
1344
waited_time.tv_nsec = (now.tv_nsec
1345
- mc.current_server->last_seen.tv_nsec);
1346
/* total time is 10s/10,000ms.
1347
Converting to s from ms by dividing by 1,000,
1348
and ns to ms by dividing by 1,000,000. */
1349
block_time = ((retry_interval
1350
- ((intmax_t)waited_time.tv_sec * 1000))
1351
- ((intmax_t)waited_time.tv_nsec / 1000000));
1352
1353
if (debug){
1354
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1355
block_time);
1356
}
1357
1358
if(block_time <= 0){
1359
ret = start_mandos_communication(mc.current_server->ip,
1360
mc.current_server->port,
1361
mc.current_server->if_index,
1362
mc.current_server->af);
1363
if(ret == 0){
1364
avahi_simple_poll_quit(mc.simple_poll);
1365
return 0;
1366
}
1367
ret = clock_gettime(CLOCK_MONOTONIC,
1368
&mc.current_server->last_seen);
1369
if(ret == -1){
1370
perror_plus("clock_gettime");
1371
return -1;
1372
}
1373
mc.current_server = mc.current_server->next;
1374
block_time = 0; /* Call avahi to find new Mandos
1375
servers, but don't block */
1376
}
1377
1378
ret = avahi_simple_poll_iterate(s, (int)block_time);
1379
}
1380
if(ret != 0){
1381
if (ret > 0 or errno != EINTR){
1382
return (ret != 1) ? ret : 0;
1383
}
1384
}
1385
}
1386
}
1387
1388
bool run_network_hooks(const char *mode, const char *interface,
1389
const float delay){
1390
struct dirent **direntries;
1391
struct dirent *direntry;
1392
int ret;
1393
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1394
alphasort);
1395
if(numhooks == -1){
1396
perror_plus("scandir");
1397
} else {
1398
int devnull = open("/dev/null", O_RDONLY);
1399
for(int i = 0; i < numhooks; i++){
1400
direntry = direntries[i];
1401
char *fullname = NULL;
1402
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1403
if(ret < 0){
1404
perror_plus("asprintf");
1405
continue;
1406
}
1407
if(debug){
1408
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1409
direntry->d_name);
1410
}
1411
pid_t hook_pid = fork();
1412
if(hook_pid == 0){
1413
/* Child */
1414
/* Raise privileges */
1415
errno = 0;
1416
ret = seteuid(0);
1417
if(ret == -1){
1418
perror_plus("seteuid");
1419
}
1420
/* Raise privileges even more */
1421
errno = 0;
1422
ret = setuid(0);
1423
if(ret == -1){
1424
perror_plus("setuid");
1425
}
1426
/* Set group */
1427
errno = 0;
1428
ret = setgid(0);
1429
if(ret == -1){
1430
perror_plus("setgid");
1431
}
1432
/* Reset supplementary groups */
1433
errno = 0;
1434
ret = setgroups(0, NULL);
1435
if(ret == -1){
1436
perror_plus("setgroups");
1437
}
1438
dup2(devnull, STDIN_FILENO);
1439
close(devnull);
1440
dup2(STDERR_FILENO, STDOUT_FILENO);
1441
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1442
if(ret == -1){
1443
perror_plus("setenv");
1444
_exit(EX_OSERR);
1445
}
1446
ret = setenv("DEVICE", interface, 1);
1447
if(ret == -1){
1448
perror_plus("setenv");
1449
_exit(EX_OSERR);
1450
}
1451
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1452
if(ret == -1){
1453
perror_plus("setenv");
1454
_exit(EX_OSERR);
1455
}
1456
ret = setenv("MODE", mode, 1);
1457
if(ret == -1){
1458
perror_plus("setenv");
1459
_exit(EX_OSERR);
1460
}
1461
char *delaystring;
1462
ret = asprintf(&delaystring, "%f", delay);
1463
if(ret == -1){
1464
perror_plus("asprintf");
1465
_exit(EX_OSERR);
1466
}
1467
ret = setenv("DELAY", delaystring, 1);
1468
if(ret == -1){
1469
free(delaystring);
1470
perror_plus("setenv");
1471
_exit(EX_OSERR);
1472
}
1473
free(delaystring);
1474
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1475
perror_plus("execl");
1476
_exit(EXIT_FAILURE);
1477
}
1478
} else {
1479
int status;
1480
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1481
perror_plus("waitpid");
1482
free(fullname);
1483
continue;
1484
}
1485
if(WIFEXITED(status)){
1486
if(WEXITSTATUS(status) != 0){
1487
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1488
" with status %d\n", direntry->d_name,
1489
WEXITSTATUS(status));
1490
free(fullname);
1491
continue;
1492
}
1493
} else if(WIFSIGNALED(status)){
1494
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1495
" signal %d\n", direntry->d_name,
1496
WTERMSIG(status));
1497
free(fullname);
1498
continue;
1499
} else {
1500
fprintf_plus(stderr, "Warning: network hook \"%s\""
1501
" crashed\n", direntry->d_name);
1502
free(fullname);
1503
continue;
1504
}
1505
}
1506
free(fullname);
1507
if(debug){
1508
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1509
direntry->d_name);
1510
}
1511
}
1512
close(devnull);
1513
}
1514
return true;
1515
}
1516
813
1517
int main(int argc, char *argv[]){
814
AvahiSServiceBrowser *sb = NULL;
815
int error;
816
int ret;
817
int exitcode = EXIT_SUCCESS;
818
const char *interface = "eth0";
819
struct ifreq network;
820
int sd;
821
uid_t uid;
822
gid_t gid;
823
char *connect_to = NULL;
824
char tempdir[] = "/tmp/mandosXXXXXX";
825
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
826
const char *seckey = PATHDIR "/" SECKEY;
827
const char *pubkey = PATHDIR "/" PUBKEY;
828
829
mandos_context mc = { .simple_poll = NULL, .server = NULL,
830
.dh_bits = 1024, .priority = "SECURE256"
831
":!CTYPE-X.509:+CTYPE-OPENPGP" };
832
bool gnutls_initalized = false;
833
bool pgpme_initalized = false;
834
835
{
836
struct argp_option options[] = {
837
{ .name = "debug", .key = 128,
838
.doc = "Debug mode", .group = 3 },
839
{ .name = "connect", .key = 'c',
840
.arg = "ADDRESS:PORT",
841
.doc = "Connect directly to a specific Mandos server",
842
.group = 1 },
843
{ .name = "interface", .key = 'i',
844
.arg = "NAME",
845
.doc = "Interface that will be used to search for Mandos"
846
" servers",
847
.group = 1 },
848
{ .name = "seckey", .key = 's',
849
.arg = "FILE",
850
.doc = "OpenPGP secret key file base name",
851
.group = 1 },
852
{ .name = "pubkey", .key = 'p',
853
.arg = "FILE",
854
.doc = "OpenPGP public key file base name",
855
.group = 2 },
856
{ .name = "dh-bits", .key = 129,
857
.arg = "BITS",
858
.doc = "Bit length of the prime number used in the"
859
" Diffie-Hellman key exchange",
860
.group = 2 },
861
{ .name = "priority", .key = 130,
862
.arg = "STRING",
863
.doc = "GnuTLS priority string for the TLS handshake",
864
.group = 1 },
865
{ .name = NULL }
866
};
867
868
error_t parse_opt (int key, char *arg,
869
struct argp_state *state) {
870
/* Get the INPUT argument from `argp_parse', which we know is
871
a pointer to our plugin list pointer. */
872
switch (key) {
873
case 128: /* --debug */
874
debug = true;
875
break;
876
case 'c': /* --connect */
877
connect_to = arg;
878
break;
879
case 'i': /* --interface */
880
interface = arg;
881
break;
882
case 's': /* --seckey */
883
seckey = arg;
884
break;
885
case 'p': /* --pubkey */
886
pubkey = arg;
887
break;
888
case 129: /* --dh-bits */
889
errno = 0;
890
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
891
if (errno){
892
perror("strtol");
893
exit(EXIT_FAILURE);
894
}
895
break;
896
case 130: /* --priority */
897
mc.priority = arg;
898
break;
899
case ARGP_KEY_ARG:
900
argp_usage (state);
901
case ARGP_KEY_END:
902
break;
903
default:
904
return ARGP_ERR_UNKNOWN;
905
}
906
return 0;
907
}
908
909
struct argp argp = { .options = options, .parser = parse_opt,
910
.args_doc = "",
911
.doc = "Mandos client -- Get and decrypt"
912
" passwords from a Mandos server" };
913
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
914
if (ret == ARGP_ERR_UNKNOWN){
915
fprintf(stderr, "Unknown error while parsing arguments\n");
916
exitcode = EXIT_FAILURE;
917
goto end;
918
}
919
}
920
921
/* If the interface is down, bring it up */
922
{
923
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
924
if(sd < 0) {
925
perror("socket");
926
exitcode = EXIT_FAILURE;
927
goto end;
928
}
929
strcpy(network.ifr_name, interface);
930
ret = ioctl(sd, SIOCGIFFLAGS, &network);
931
if(ret == -1){
932
perror("ioctl SIOCGIFFLAGS");
933
exitcode = EXIT_FAILURE;
934
goto end;
935
}
936
if((network.ifr_flags & IFF_UP) == 0){
937
network.ifr_flags |= IFF_UP;
938
ret = ioctl(sd, SIOCSIFFLAGS, &network);
939
if(ret == -1){
940
perror("ioctl SIOCSIFFLAGS");
941
exitcode = EXIT_FAILURE;
942
goto end;
943
}
944
}
945
ret = TEMP_FAILURE_RETRY(close(sd));
946
if(ret == -1){
947
perror("close");
948
}
949
}
950
951
uid = getuid();
952
gid = getgid();
953
954
ret = setuid(uid);
955
if (ret == -1){
956
perror("setuid");
957
}
958
959
setgid(gid);
960
if (ret == -1){
961
perror("setgid");
962
}
963
964
ret = init_gnutls_global(&mc, pubkey, seckey);
965
if (ret == -1){
966
fprintf(stderr, "init_gnutls_global failed\n");
967
exitcode = EXIT_FAILURE;
968
goto end;
969
} else {
970
gnutls_initalized = true;
971
}
972
973
if(mkdtemp(tempdir) == NULL){
974
perror("mkdtemp");
975
tempdir[0] = '\0';
976
goto end;
977
}
978
979
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
980
fprintf(stderr, "pgpme_initalized failed\n");
981
exitcode = EXIT_FAILURE;
982
goto end;
983
} else {
984
pgpme_initalized = true;
985
}
986
1518
AvahiSServiceBrowser *sb = NULL;
1519
int error;
1520
int ret;
1521
intmax_t tmpmax;
1522
char *tmp;
1523
int exitcode = EXIT_SUCCESS;
1524
const char *interface = "";
1525
struct ifreq network;
1526
int sd = -1;
1527
bool take_down_interface = false;
1528
uid_t uid;
1529
gid_t gid;
1530
char tempdir[] = "/tmp/mandosXXXXXX";
1531
bool tempdir_created = false;
1532
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1533
const char *seckey = PATHDIR "/" SECKEY;
1534
const char *pubkey = PATHDIR "/" PUBKEY;
1535
1536
bool gnutls_initialized = false;
1537
bool gpgme_initialized = false;
1538
float delay = 2.5f;
1539
double retry_interval = 10; /* 10s between trying a server and
1540
retrying the same server again */
1541
1542
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1543
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1544
1545
uid = getuid();
1546
gid = getgid();
1547
1548
/* Lower any group privileges we might have, just to be safe */
1549
errno = 0;
1550
ret = setgid(gid);
1551
if(ret == -1){
1552
perror_plus("setgid");
1553
}
1554
1555
/* Lower user privileges (temporarily) */
1556
errno = 0;
1557
ret = seteuid(uid);
1558
if(ret == -1){
1559
perror_plus("seteuid");
1560
}
1561
1562
if(quit_now){
1563
goto end;
1564
}
1565
1566
{
1567
struct argp_option options[] = {
1568
{ .name = "debug", .key = 128,
1569
.doc = "Debug mode", .group = 3 },
1570
{ .name = "connect", .key = 'c',
1571
.arg = "ADDRESS:PORT",
1572
.doc = "Connect directly to a specific Mandos server",
1573
.group = 1 },
1574
{ .name = "interface", .key = 'i',
1575
.arg = "NAME",
1576
.doc = "Network interface that will be used to search for"
1577
" Mandos servers",
1578
.group = 1 },
1579
{ .name = "seckey", .key = 's',
1580
.arg = "FILE",
1581
.doc = "OpenPGP secret key file base name",
1582
.group = 1 },
1583
{ .name = "pubkey", .key = 'p',
1584
.arg = "FILE",
1585
.doc = "OpenPGP public key file base name",
1586
.group = 2 },
1587
{ .name = "dh-bits", .key = 129,
1588
.arg = "BITS",
1589
.doc = "Bit length of the prime number used in the"
1590
" Diffie-Hellman key exchange",
1591
.group = 2 },
1592
{ .name = "priority", .key = 130,
1593
.arg = "STRING",
1594
.doc = "GnuTLS priority string for the TLS handshake",
1595
.group = 1 },
1596
{ .name = "delay", .key = 131,
1597
.arg = "SECONDS",
1598
.doc = "Maximum delay to wait for interface startup",
1599
.group = 2 },
1600
{ .name = "retry", .key = 132,
1601
.arg = "SECONDS",
1602
.doc = "Retry interval used when denied by the mandos server",
1603
.group = 2 },
1604
{ .name = "network-hook-dir", .key = 133,
1605
.arg = "DIR",
1606
.doc = "Directory where network hooks are located",
1607
.group = 2 },
1608
/*
1609
* These reproduce what we would get without ARGP_NO_HELP
1610
*/
1611
{ .name = "help", .key = '?',
1612
.doc = "Give this help list", .group = -1 },
1613
{ .name = "usage", .key = -3,
1614
.doc = "Give a short usage message", .group = -1 },
1615
{ .name = "version", .key = 'V',
1616
.doc = "Print program version", .group = -1 },
1617
{ .name = NULL }
1618
};
1619
1620
error_t parse_opt(int key, char *arg,
1621
struct argp_state *state){
1622
errno = 0;
1623
switch(key){
1624
case 128: /* --debug */
1625
debug = true;
1626
break;
1627
case 'c': /* --connect */
1628
connect_to = arg;
1629
break;
1630
case 'i': /* --interface */
1631
interface = arg;
1632
break;
1633
case 's': /* --seckey */
1634
seckey = arg;
1635
break;
1636
case 'p': /* --pubkey */
1637
pubkey = arg;
1638
break;
1639
case 129: /* --dh-bits */
1640
errno = 0;
1641
tmpmax = strtoimax(arg, &tmp, 10);
1642
if(errno != 0 or tmp == arg or *tmp != '\0'
1643
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1644
argp_error(state, "Bad number of DH bits");
1645
}
1646
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1647
break;
1648
case 130: /* --priority */
1649
mc.priority = arg;
1650
break;
1651
case 131: /* --delay */
1652
errno = 0;
1653
delay = strtof(arg, &tmp);
1654
if(errno != 0 or tmp == arg or *tmp != '\0'){
1655
argp_error(state, "Bad delay");
1656
}
1657
case 132: /* --retry */
1658
errno = 0;
1659
retry_interval = strtod(arg, &tmp);
1660
if(errno != 0 or tmp == arg or *tmp != '\0'
1661
or (retry_interval * 1000) > INT_MAX
1662
or retry_interval < 0){
1663
argp_error(state, "Bad retry interval");
1664
}
1665
break;
1666
case 133: /* --network-hook-dir */
1667
hookdir = arg;
1668
break;
1669
/*
1670
* These reproduce what we would get without ARGP_NO_HELP
1671
*/
1672
case '?': /* --help */
1673
argp_state_help(state, state->out_stream,
1674
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1675
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1676
case -3: /* --usage */
1677
argp_state_help(state, state->out_stream,
1678
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1679
case 'V': /* --version */
1680
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1681
exit(argp_err_exit_status);
1682
break;
1683
default:
1684
return ARGP_ERR_UNKNOWN;
1685
}
1686
return errno;
1687
}
1688
1689
struct argp argp = { .options = options, .parser = parse_opt,
1690
.args_doc = "",
1691
.doc = "Mandos client -- Get and decrypt"
1692
" passwords from a Mandos server" };
1693
ret = argp_parse(&argp, argc, argv,
1694
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1695
switch(ret){
1696
case 0:
1697
break;
1698
case ENOMEM:
1699
default:
1700
errno = ret;
1701
perror_plus("argp_parse");
1702
exitcode = EX_OSERR;
1703
goto end;
1704
case EINVAL:
1705
exitcode = EX_USAGE;
1706
goto end;
1707
}
1708
}
1709
1710
{
1711
/* Work around Debian bug #633582:
1712
<http://bugs.debian.org/633582> */
1713
1714
/* Re-raise priviliges */
1715
errno = 0;
1716
ret = seteuid(0);
1717
if(ret == -1){
1718
perror_plus("seteuid");
1719
} else {
1720
struct stat st;
1721
1722
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1723
int seckey_fd = open(seckey, O_RDONLY);
1724
if(seckey_fd == -1){
1725
perror_plus("open");
1726
} else {
1727
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1728
if(ret == -1){
1729
perror_plus("fstat");
1730
} else {
1731
if(S_ISREG(st.st_mode)
1732
and st.st_uid == 0 and st.st_gid == 0){
1733
ret = fchown(seckey_fd, uid, gid);
1734
if(ret == -1){
1735
perror_plus("fchown");
1736
}
1737
}
1738
}
1739
TEMP_FAILURE_RETRY(close(seckey_fd));
1740
}
1741
}
1742
1743
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1744
int pubkey_fd = open(pubkey, O_RDONLY);
1745
if(pubkey_fd == -1){
1746
perror_plus("open");
1747
} else {
1748
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1749
if(ret == -1){
1750
perror_plus("fstat");
1751
} else {
1752
if(S_ISREG(st.st_mode)
1753
and st.st_uid == 0 and st.st_gid == 0){
1754
ret = fchown(pubkey_fd, uid, gid);
1755
if(ret == -1){
1756
perror_plus("fchown");
1757
}
1758
}
1759
}
1760
TEMP_FAILURE_RETRY(close(pubkey_fd));
1761
}
1762
}
1763
1764
/* Lower privileges */
1765
errno = 0;
1766
ret = seteuid(uid);
1767
if(ret == -1){
1768
perror_plus("seteuid");
1769
}
1770
}
1771
}
1772
1773
/* Run network hooks */
1774
if(not run_network_hooks("start", interface, delay)){
1775
goto end;
1776
}
1777
1778
if(not debug){
1779
avahi_set_log_function(empty_log);
1780
}
1781
1782
if(interface[0] == '\0'){
1783
struct dirent **direntries;
1784
/* First look for interfaces that are up */
1785
ret = scandir(sys_class_net, &direntries, up_interface,
1786
alphasort);
1787
if(ret == 0){
1788
/* No up interfaces, look for any good interfaces */
1789
free(direntries);
1790
ret = scandir(sys_class_net, &direntries, good_interface,
1791
alphasort);
1792
}
1793
if(ret >= 1){
1794
/* Pick the first interface returned */
1795
interface = strdup(direntries[0]->d_name);
1796
if(debug){
1797
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1798
}
1799
if(interface == NULL){
1800
perror_plus("malloc");
1801
free(direntries);
1802
exitcode = EXIT_FAILURE;
1803
goto end;
1804
}
1805
free(direntries);
1806
} else {
1807
free(direntries);
1808
fprintf_plus(stderr, "Could not find a network interface\n");
1809
exitcode = EXIT_FAILURE;
1810
goto end;
1811
}
1812
}
1813
1814
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1815
from the signal handler */
1816
/* Initialize the pseudo-RNG for Avahi */
1817
srand((unsigned int) time(NULL));
1818
mc.simple_poll = avahi_simple_poll_new();
1819
if(mc.simple_poll == NULL){
1820
fprintf_plus(stderr,
1821
"Avahi: Failed to create simple poll object.\n");
1822
exitcode = EX_UNAVAILABLE;
1823
goto end;
1824
}
1825
1826
sigemptyset(&sigterm_action.sa_mask);
1827
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1828
if(ret == -1){
1829
perror_plus("sigaddset");
1830
exitcode = EX_OSERR;
1831
goto end;
1832
}
1833
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1834
if(ret == -1){
1835
perror_plus("sigaddset");
1836
exitcode = EX_OSERR;
1837
goto end;
1838
}
1839
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1840
if(ret == -1){
1841
perror_plus("sigaddset");
1842
exitcode = EX_OSERR;
1843
goto end;
1844
}
1845
/* Need to check if the handler is SIG_IGN before handling:
1846
| [[info:libc:Initial Signal Actions]] |
1847
| [[info:libc:Basic Signal Handling]] |
1848
*/
1849
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1850
if(ret == -1){
1851
perror_plus("sigaction");
1852
return EX_OSERR;
1853
}
1854
if(old_sigterm_action.sa_handler != SIG_IGN){
1855
ret = sigaction(SIGINT, &sigterm_action, NULL);
1856
if(ret == -1){
1857
perror_plus("sigaction");
1858
exitcode = EX_OSERR;
1859
goto end;
1860
}
1861
}
1862
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1863
if(ret == -1){
1864
perror_plus("sigaction");
1865
return EX_OSERR;
1866
}
1867
if(old_sigterm_action.sa_handler != SIG_IGN){
1868
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1869
if(ret == -1){
1870
perror_plus("sigaction");
1871
exitcode = EX_OSERR;
1872
goto end;
1873
}
1874
}
1875
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1876
if(ret == -1){
1877
perror_plus("sigaction");
1878
return EX_OSERR;
1879
}
1880
if(old_sigterm_action.sa_handler != SIG_IGN){
1881
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1882
if(ret == -1){
1883
perror_plus("sigaction");
1884
exitcode = EX_OSERR;
1885
goto end;
1886
}
1887
}
1888
1889
/* If the interface is down, bring it up */
1890
if(strcmp(interface, "none") != 0){
987
1891
if_index = (AvahiIfIndex) if_nametoindex(interface);
988
1892
if(if_index == 0){
989
fprintf(stderr, "No such interface: \"%s\"\n", interface);
990
exit(EXIT_FAILURE);
991
}
992
993
if(connect_to != NULL){
994
/* Connect directly, do not use Zeroconf */
995
/* (Mainly meant for debugging) */
996
char *address = strrchr(connect_to, ':');
997
if(address == NULL){
998
fprintf(stderr, "No colon in address\n");
999
exitcode = EXIT_FAILURE;
1000
goto end;
1001
}
1002
errno = 0;
1003
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
1004
if(errno){
1005
perror("Bad port number");
1006
exitcode = EXIT_FAILURE;
1007
goto end;
1008
}
1009
*address = '\0';
1010
address = connect_to;
1011
ret = start_mandos_communication(address, port, if_index, &mc);
1012
if(ret < 0){
1013
exitcode = EXIT_FAILURE;
1014
} else {
1015
exitcode = EXIT_SUCCESS;
1016
}
1017
goto end;
1018
}
1019
1020
if (not debug){
1021
avahi_set_log_function(empty_log);
1022
}
1023
1024
/* Initialize the pseudo-RNG for Avahi */
1025
srand((unsigned int) time(NULL));
1026
1027
/* Allocate main Avahi loop object */
1028
mc.simple_poll = avahi_simple_poll_new();
1029
if (mc.simple_poll == NULL) {
1030
fprintf(stderr, "Avahi: Failed to create simple poll"
1031
" object.\n");
1032
exitcode = EXIT_FAILURE;
1033
goto end;
1034
}
1035
1036
{
1037
AvahiServerConfig config;
1038
/* Do not publish any local Zeroconf records */
1039
avahi_server_config_init(&config);
1040
config.publish_hinfo = 0;
1041
config.publish_addresses = 0;
1042
config.publish_workstation = 0;
1043
config.publish_domain = 0;
1044
1045
/* Allocate a new server */
1046
mc.server = avahi_server_new(avahi_simple_poll_get
1047
(mc.simple_poll), &config, NULL,
1048
NULL, &error);
1049
1050
/* Free the Avahi configuration data */
1051
avahi_server_config_free(&config);
1052
}
1053
1054
/* Check if creating the Avahi server object succeeded */
1055
if (mc.server == NULL) {
1056
fprintf(stderr, "Failed to create Avahi server: %s\n",
1057
avahi_strerror(error));
1058
exitcode = EXIT_FAILURE;
1059
goto end;
1060
}
1061
1062
/* Create the Avahi service browser */
1063
sb = avahi_s_service_browser_new(mc.server, if_index,
1064
AVAHI_PROTO_INET6,
1065
"_mandos._tcp", NULL, 0,
1066
browse_callback, &mc);
1067
if (sb == NULL) {
1068
fprintf(stderr, "Failed to create service browser: %s\n",
1069
avahi_strerror(avahi_server_errno(mc.server)));
1070
exitcode = EXIT_FAILURE;
1071
goto end;
1072
}
1073
1074
/* Run the main loop */
1075
1076
if (debug){
1077
fprintf(stderr, "Starting Avahi loop search\n");
1078
}
1079
1080
avahi_simple_poll_loop(mc.simple_poll);
1081
1893
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1894
exitcode = EX_UNAVAILABLE;
1895
goto end;
1896
}
1897
1898
if(quit_now){
1899
goto end;
1900
}
1901
1902
/* Re-raise priviliges */
1903
errno = 0;
1904
ret = seteuid(0);
1905
if(ret == -1){
1906
perror_plus("seteuid");
1907
}
1908
1909
#ifdef __linux__
1910
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1911
messages about the network interface to mess up the prompt */
1912
ret = klogctl(8, NULL, 5);
1913
bool restore_loglevel = true;
1914
if(ret == -1){
1915
restore_loglevel = false;
1916
perror_plus("klogctl");
1917
}
1918
#endif /* __linux__ */
1919
1920
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1921
if(sd < 0){
1922
perror_plus("socket");
1923
exitcode = EX_OSERR;
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
/* Lower privileges */
1933
errno = 0;
1934
ret = seteuid(uid);
1935
if(ret == -1){
1936
perror_plus("seteuid");
1937
}
1938
goto end;
1939
}
1940
strcpy(network.ifr_name, interface);
1941
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1942
if(ret == -1){
1943
perror_plus("ioctl SIOCGIFFLAGS");
1944
#ifdef __linux__
1945
if(restore_loglevel){
1946
ret = klogctl(7, NULL, 0);
1947
if(ret == -1){
1948
perror_plus("klogctl");
1949
}
1950
}
1951
#endif /* __linux__ */
1952
exitcode = EX_OSERR;
1953
/* Lower privileges */
1954
errno = 0;
1955
ret = seteuid(uid);
1956
if(ret == -1){
1957
perror_plus("seteuid");
1958
}
1959
goto end;
1960
}
1961
if((network.ifr_flags & IFF_UP) == 0){
1962
network.ifr_flags |= IFF_UP;
1963
take_down_interface = true;
1964
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1965
if(ret == -1){
1966
take_down_interface = false;
1967
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1968
exitcode = EX_OSERR;
1969
#ifdef __linux__
1970
if(restore_loglevel){
1971
ret = klogctl(7, NULL, 0);
1972
if(ret == -1){
1973
perror_plus("klogctl");
1974
}
1975
}
1976
#endif /* __linux__ */
1977
/* Lower privileges */
1978
errno = 0;
1979
ret = seteuid(uid);
1980
if(ret == -1){
1981
perror_plus("seteuid");
1982
}
1983
goto end;
1984
}
1985
}
1986
/* Sleep checking until interface is running.
1987
Check every 0.25s, up to total time of delay */
1988
for(int i=0; i < delay * 4; i++){
1989
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1990
if(ret == -1){
1991
perror_plus("ioctl SIOCGIFFLAGS");
1992
} else if(network.ifr_flags & IFF_RUNNING){
1993
break;
1994
}
1995
struct timespec sleeptime = { .tv_nsec = 250000000 };
1996
ret = nanosleep(&sleeptime, NULL);
1997
if(ret == -1 and errno != EINTR){
1998
perror_plus("nanosleep");
1999
}
2000
}
2001
if(not take_down_interface){
2002
/* We won't need the socket anymore */
2003
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2004
if(ret == -1){
2005
perror_plus("close");
2006
}
2007
}
2008
#ifdef __linux__
2009
if(restore_loglevel){
2010
/* Restores kernel loglevel to default */
2011
ret = klogctl(7, NULL, 0);
2012
if(ret == -1){
2013
perror_plus("klogctl");
2014
}
2015
}
2016
#endif /* __linux__ */
2017
/* Lower privileges */
2018
errno = 0;
2019
/* Lower privileges */
2020
ret = seteuid(uid);
2021
if(ret == -1){
2022
perror_plus("seteuid");
2023
}
2024
}
2025
2026
if(quit_now){
2027
goto end;
2028
}
2029
2030
ret = init_gnutls_global(pubkey, seckey);
2031
if(ret == -1){
2032
fprintf_plus(stderr, "init_gnutls_global failed\n");
2033
exitcode = EX_UNAVAILABLE;
2034
goto end;
2035
} else {
2036
gnutls_initialized = true;
2037
}
2038
2039
if(quit_now){
2040
goto end;
2041
}
2042
2043
if(mkdtemp(tempdir) == NULL){
2044
perror_plus("mkdtemp");
2045
goto end;
2046
}
2047
tempdir_created = true;
2048
2049
if(quit_now){
2050
goto end;
2051
}
2052
2053
if(not init_gpgme(pubkey, seckey, tempdir)){
2054
fprintf_plus(stderr, "init_gpgme failed\n");
2055
exitcode = EX_UNAVAILABLE;
2056
goto end;
2057
} else {
2058
gpgme_initialized = true;
2059
}
2060
2061
if(quit_now){
2062
goto end;
2063
}
2064
2065
if(connect_to != NULL){
2066
/* Connect directly, do not use Zeroconf */
2067
/* (Mainly meant for debugging) */
2068
char *address = strrchr(connect_to, ':');
2069
if(address == NULL){
2070
fprintf_plus(stderr, "No colon in address\n");
2071
exitcode = EX_USAGE;
2072
goto end;
2073
}
2074
2075
if(quit_now){
2076
goto end;
2077
}
2078
2079
uint16_t port;
2080
errno = 0;
2081
tmpmax = strtoimax(address+1, &tmp, 10);
2082
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2083
or tmpmax != (uint16_t)tmpmax){
2084
fprintf_plus(stderr, "Bad port number\n");
2085
exitcode = EX_USAGE;
2086
goto end;
2087
}
2088
2089
if(quit_now){
2090
goto end;
2091
}
2092
2093
port = (uint16_t)tmpmax;
2094
*address = '\0';
2095
/* Colon in address indicates IPv6 */
2096
int af;
2097
if(strchr(connect_to, ':') != NULL){
2098
af = AF_INET6;
2099
/* Accept [] around IPv6 address - see RFC 5952 */
2100
if(connect_to[0] == '[' and address[-1] == ']')
2101
{
2102
connect_to++;
2103
address[-1] = '\0';
2104
}
2105
} else {
2106
af = AF_INET;
2107
}
2108
address = connect_to;
2109
2110
if(quit_now){
2111
goto end;
2112
}
2113
2114
while(not quit_now){
2115
ret = start_mandos_communication(address, port, if_index, af);
2116
if(quit_now or ret == 0){
2117
break;
2118
}
2119
if(debug){
2120
fprintf_plus(stderr, "Retrying in %d seconds\n",
2121
(int)retry_interval);
2122
}
2123
sleep((int)retry_interval);
2124
}
2125
2126
if (not quit_now){
2127
exitcode = EXIT_SUCCESS;
2128
}
2129
2130
goto end;
2131
}
2132
2133
if(quit_now){
2134
goto end;
2135
}
2136
2137
{
2138
AvahiServerConfig config;
2139
/* Do not publish any local Zeroconf records */
2140
avahi_server_config_init(&config);
2141
config.publish_hinfo = 0;
2142
config.publish_addresses = 0;
2143
config.publish_workstation = 0;
2144
config.publish_domain = 0;
2145
2146
/* Allocate a new server */
2147
mc.server = avahi_server_new(avahi_simple_poll_get
2148
(mc.simple_poll), &config, NULL,
2149
NULL, &error);
2150
2151
/* Free the Avahi configuration data */
2152
avahi_server_config_free(&config);
2153
}
2154
2155
/* Check if creating the Avahi server object succeeded */
2156
if(mc.server == NULL){
2157
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2158
avahi_strerror(error));
2159
exitcode = EX_UNAVAILABLE;
2160
goto end;
2161
}
2162
2163
if(quit_now){
2164
goto end;
2165
}
2166
2167
/* Create the Avahi service browser */
2168
sb = avahi_s_service_browser_new(mc.server, if_index,
2169
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2170
NULL, 0, browse_callback, NULL);
2171
if(sb == NULL){
2172
fprintf_plus(stderr, "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_plus(stderr, "Starting Avahi loop search\n");
2186
}
2187
2188
ret = avahi_loop_with_timeout(mc.simple_poll,
2189
(int)(retry_interval * 1000));
2190
if(debug){
2191
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2192
(ret == 0) ? "successfully" : "with error");
2193
}
2194
1082
2195
end:
1083
1084
if (debug){
1085
fprintf(stderr, "%s exiting\n", argv[0]);
1086
}
1087
1088
/* Cleanup things */
1089
if (sb != NULL)
1090
avahi_s_service_browser_free(sb);
1091
1092
if (mc.server != NULL)
1093
avahi_server_free(mc.server);
1094
1095
if (mc.simple_poll != NULL)
1096
avahi_simple_poll_free(mc.simple_poll);
1097
1098
if (gnutls_initalized){
1099
gnutls_certificate_free_credentials(mc.cred);
1100
gnutls_global_deinit ();
1101
}
1102
1103
if(pgpme_initalized){
1104
gpgme_release(mc.ctx);
1105
}
1106
1107
/* Removes the temp directory used by GPGME */
1108
if(tempdir[0] != '\0'){
1109
DIR *d;
1110
struct dirent *direntry;
1111
d = opendir(tempdir);
1112
if(d == NULL){
1113
perror("opendir");
1114
} else {
1115
while(true){
1116
direntry = readdir(d);
1117
if(direntry == NULL){
1118
break;
1119
}
1120
if (direntry->d_type == DT_REG){
1121
char *fullname = NULL;
1122
ret = asprintf(&fullname, "%s/%s", tempdir,
1123
direntry->d_name);
1124
if(ret < 0){
1125
perror("asprintf");
1126
continue;
1127
}
1128
ret = unlink(fullname);
1129
if(ret == -1){
1130
fprintf(stderr, "unlink(\"%s\"): %s",
1131
fullname, strerror(errno));
1132
}
1133
free(fullname);
1134
}
1135
}
1136
}
1137
ret = rmdir(tempdir);
1138
if(ret == -1){
1139
perror("rmdir");
1140
}
1141
}
1142
1143
return exitcode;
2196
2197
if(debug){
2198
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2199
}
2200
2201
/* Cleanup things */
2202
if(sb != NULL)
2203
avahi_s_service_browser_free(sb);
2204
2205
if(mc.server != NULL)
2206
avahi_server_free(mc.server);
2207
2208
if(mc.simple_poll != NULL)
2209
avahi_simple_poll_free(mc.simple_poll);
2210
2211
if(gnutls_initialized){
2212
gnutls_certificate_free_credentials(mc.cred);
2213
gnutls_global_deinit();
2214
gnutls_dh_params_deinit(mc.dh_params);
2215
}
2216
2217
if(gpgme_initialized){
2218
gpgme_release(mc.ctx);
2219
}
2220
2221
/* Cleans up the circular linked list of Mandos servers the client
2222
has seen */
2223
if(mc.current_server != NULL){
2224
mc.current_server->prev->next = NULL;
2225
while(mc.current_server != NULL){
2226
server *next = mc.current_server->next;
2227
free(mc.current_server);
2228
mc.current_server = next;
2229
}
2230
}
2231
2232
/* Run network hooks */
2233
run_network_hooks("stop", interface, delay);
2234
2235
/* Re-raise priviliges */
2236
{
2237
errno = 0;
2238
ret = seteuid(0);
2239
if(ret == -1){
2240
perror_plus("seteuid");
2241
}
2242
2243
/* Take down the network interface */
2244
if(take_down_interface and geteuid() == 0){
2245
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2246
if(ret == -1){
2247
perror_plus("ioctl SIOCGIFFLAGS");
2248
} else if(network.ifr_flags & IFF_UP){
2249
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2250
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2251
if(ret == -1){
2252
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2253
}
2254
}
2255
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2256
if(ret == -1){
2257
perror_plus("close");
2258
}
2259
}
2260
}
2261
/* Lower privileges permanently */
2262
errno = 0;
2263
ret = setuid(uid);
2264
if(ret == -1){
2265
perror_plus("setuid");
2266
}
2267
2268
/* Removes the GPGME temp directory and all files inside */
2269
if(tempdir_created){
2270
struct dirent **direntries = NULL;
2271
struct dirent *direntry = NULL;
2272
int numentries = scandir(tempdir, &direntries, notdotentries,
2273
alphasort);
2274
if (numentries > 0){
2275
for(int i = 0; i < numentries; i++){
2276
direntry = direntries[i];
2277
char *fullname = NULL;
2278
ret = asprintf(&fullname, "%s/%s", tempdir,
2279
direntry->d_name);
2280
if(ret < 0){
2281
perror_plus("asprintf");
2282
continue;
2283
}
2284
ret = remove(fullname);
2285
if(ret == -1){
2286
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2287
strerror(errno));
2288
}
2289
free(fullname);
2290
}
2291
}
2292
2293
/* need to clean even if 0 because man page doesn't specify */
2294
free(direntries);
2295
if (numentries == -1){
2296
perror_plus("scandir");
2297
}
2298
ret = rmdir(tempdir);
2299
if(ret == -1 and errno != ENOENT){
2300
perror_plus("rmdir");
2301
}
2302
}
2303
2304
if(quit_now){
2305
sigemptyset(&old_sigterm_action.sa_mask);
2306
old_sigterm_action.sa_handler = SIG_DFL;
2307
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2308
&old_sigterm_action,
2309
NULL));
2310
if(ret == -1){
2311
perror_plus("sigaction");
2312
}
2313
do {
2314
ret = raise(signal_received);
2315
} while(ret != 0 and errno == EINTR);
2316
if(ret != 0){
2317
perror_plus("raise");
2318
abort();
2319
}
2320
TEMP_FAILURE_RETRY(pause());
2321
}
2322
2323
return exitcode;
1144
2324
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0