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- Committer: teddy at bsnet
- Date: 2011-12-25 00:40:09 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-20111225004009-n5uimmac6h8djtv8
* plugin-runner.c (add_to_char_array): Added "nonnull" attribute.
(add_argument): Added "nonnull" attribute on the "arg" argument.
(add_environment): Added "nonnull" attribute on the "def" argument.
(print_out_password, free_plugin): Added "nonnull" attribute.
(main/parse_opt): Added "nonnull" attribute on the "state" argument.
* plugins.d/mandos-client.c (perror_plus): Bug fix; restore errno
after fprintf().
* plugins.d/password-prompt.c (fprintf_plus): New.
(conflict_detection/is_plymouth, main/parse_opt): Added "nonnull"
attribute.
(conflict_detection/is_plymouth, conflict_detection, main): Bug fix;
Call
error_plus()
instead
of
error().
(main/parse_opt): Added "nonnull" attribute on the "state" argument.
* plugins.d/plymouth.c (exec_and_wait): Added "nonnull" attribute on
the "path" and "argv"
arguments.
(is_plymouth): Added "nonnull" attribute.
(add_argument): Added "nonnull" attribute on the "arg" argument.
(add_environment): Added "nonnull" attribute on the "def" argument.
(print_out_password, free_plugin): Added "nonnull" attribute.
(main/parse_opt): Added "nonnull" attribute on the "state" argument.
* plugins.d/mandos-client.c (perror_plus): Bug fix; restore errno
after fprintf().
* plugins.d/password-prompt.c (fprintf_plus): New.
(conflict_detection/is_plymouth, main/parse_opt): Added "nonnull"
attribute.
(conflict_detection/is_plymouth, conflict_detection, main): Bug fix;
Call
error_plus()
instead
of
error().
(main/parse_opt): Added "nonnull" attribute on the "state" argument.
* plugins.d/plymouth.c (exec_and_wait): Added "nonnull" attribute on
the "path" and "argv"
arguments.
(is_plymouth): Added "nonnull" attribute.
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- network-hooks.d
- files removed:
- plugins.d/usplash
- 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 */
51
#include <inttypes.h> /* PRIu16 */
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() */
59
#include <fcntl.h> /* open() */
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
*/
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
55
64
#include <assert.h> /* assert() */
56
#include <errno.h> /* perror(), errno */
57
#include <time.h> /* time() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
58
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
59
69
SIOCSIFFLAGS, if_indextoname(),
60
70
if_nametoindex(), IF_NAMESIZE */
71
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
*/
61
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
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 */
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 */
67
79
#include <argp.h> /* struct argp_option, error_t, struct
68
80
argp_state, struct argp,
69
81
argp_parse(), ARGP_KEY_ARG,
70
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__ */
71
95
72
96
/* Avahi */
73
97
/* All Avahi types, constants and functions
86
110
gnutls_*
87
111
init_gnutls_session(),
88
112
GNUTLS_* */
89
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
90
GNUTLS_OPENPGP_FMT_BASE64 */
113
#include <gnutls/openpgp.h>
114
/* gnutls_certificate_set_openpgp_key_file(),
115
GNUTLS_OPENPGP_FMT_BASE64 */
91
116
92
117
/* GPGME */
93
118
#include <gpgme.h> /* All GPGME types, constants and
98
123
99
124
#define BUFFER_SIZE 256
100
125
126
#define PATHDIR "/conf/conf.d/mandos"
127
#define SECKEY "seckey.txt"
128
#define PUBKEY "pubkey.txt"
129
#define HOOKDIR "/lib/mandos/network-hooks.d"
130
101
131
bool debug = false;
102
static const char *keydir = "/conf/conf.d/mandos";
103
132
static const char mandos_protocol_version[] = "1";
104
const char *argp_program_version = "password-request 1.0";
105
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;
106
149
107
150
/* Used for passing in values through the Avahi callback functions */
108
151
typedef struct {
112
155
unsigned int dh_bits;
113
156
gnutls_dh_params_t dh_params;
114
157
const char *priority;
158
gpgme_ctx_t ctx;
159
server *current_server;
115
160
} mandos_context;
116
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
int e = errno;
174
fprintf(stderr, "Mandos plugin %s: ",
175
program_invocation_short_name);
176
errno = e;
177
perror(print_text);
178
}
179
180
__attribute__((format (gnu_printf, 2, 3)))
181
int fprintf_plus(FILE *stream, const char *format, ...){
182
va_list ap;
183
va_start (ap, format);
184
185
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
186
program_invocation_short_name));
187
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
188
}
189
117
190
/*
118
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
119
* "buffer_capacity" is how much is currently allocated,
191
* Make additional room in "buffer" for at least BUFFER_SIZE more
192
* bytes. "buffer_capacity" is how much is currently allocated,
120
193
* "buffer_length" is how much is already used.
121
194
*/
122
size_t adjustbuffer(char **buffer, size_t buffer_length,
123
size_t buffer_capacity){
124
if (buffer_length + BUFFER_SIZE > buffer_capacity){
195
size_t incbuffer(char **buffer, size_t buffer_length,
196
size_t buffer_capacity){
197
if(buffer_length + BUFFER_SIZE > buffer_capacity){
125
198
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
126
if (buffer == NULL){
199
if(buffer == NULL){
127
200
return 0;
128
201
}
129
202
buffer_capacity += BUFFER_SIZE;
131
204
return buffer_capacity;
132
205
}
133
206
207
/* Add server to set of servers to retry periodically */
208
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
209
int af){
210
int ret;
211
server *new_server = malloc(sizeof(server));
212
if(new_server == NULL){
213
perror_plus("malloc");
214
return false;
215
}
216
*new_server = (server){ .ip = strdup(ip),
217
.port = port,
218
.if_index = if_index,
219
.af = af };
220
if(new_server->ip == NULL){
221
perror_plus("strdup");
222
return false;
223
}
224
/* Special case of first server */
225
if (mc.current_server == NULL){
226
new_server->next = new_server;
227
new_server->prev = new_server;
228
mc.current_server = new_server;
229
/* Place the new server last in the list */
230
} else {
231
new_server->next = mc.current_server;
232
new_server->prev = mc.current_server->prev;
233
new_server->prev->next = new_server;
234
mc.current_server->prev = new_server;
235
}
236
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
237
if(ret == -1){
238
perror_plus("clock_gettime");
239
return false;
240
}
241
return true;
242
}
243
134
244
/*
135
* Decrypt OpenPGP data using keyrings in HOMEDIR.
136
* Returns -1 on error
245
* Initialize GPGME.
137
246
*/
138
static ssize_t pgp_packet_decrypt (const char *cryptotext,
139
size_t crypto_size,
140
char **plaintext,
141
const char *homedir){
142
gpgme_data_t dh_crypto, dh_plain;
143
gpgme_ctx_t ctx;
247
static bool init_gpgme(const char *seckey, const char *pubkey,
248
const char *tempdir){
144
249
gpgme_error_t rc;
145
ssize_t ret;
146
size_t plaintext_capacity = 0;
147
ssize_t plaintext_length = 0;
148
250
gpgme_engine_info_t engine_info;
149
251
150
if (debug){
151
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
252
253
/*
254
* Helper function to insert pub and seckey to the engine keyring.
255
*/
256
bool import_key(const char *filename){
257
int ret;
258
int fd;
259
gpgme_data_t pgp_data;
260
261
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
262
if(fd == -1){
263
perror_plus("open");
264
return false;
265
}
266
267
rc = gpgme_data_new_from_fd(&pgp_data, fd);
268
if(rc != GPG_ERR_NO_ERROR){
269
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
270
gpgme_strsource(rc), gpgme_strerror(rc));
271
return false;
272
}
273
274
rc = gpgme_op_import(mc.ctx, pgp_data);
275
if(rc != GPG_ERR_NO_ERROR){
276
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
277
gpgme_strsource(rc), gpgme_strerror(rc));
278
return false;
279
}
280
281
ret = (int)TEMP_FAILURE_RETRY(close(fd));
282
if(ret == -1){
283
perror_plus("close");
284
}
285
gpgme_data_release(pgp_data);
286
return true;
287
}
288
289
if(debug){
290
fprintf_plus(stderr, "Initializing GPGME\n");
152
291
}
153
292
154
293
/* Init GPGME */
155
294
gpgme_check_version(NULL);
156
295
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
157
if (rc != GPG_ERR_NO_ERROR){
158
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
159
gpgme_strsource(rc), gpgme_strerror(rc));
160
return -1;
296
if(rc != GPG_ERR_NO_ERROR){
297
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
298
gpgme_strsource(rc), gpgme_strerror(rc));
299
return false;
161
300
}
162
301
163
302
/* Set GPGME home directory for the OpenPGP engine only */
164
rc = gpgme_get_engine_info (&engine_info);
165
if (rc != GPG_ERR_NO_ERROR){
166
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
167
gpgme_strsource(rc), gpgme_strerror(rc));
168
return -1;
303
rc = gpgme_get_engine_info(&engine_info);
304
if(rc != GPG_ERR_NO_ERROR){
305
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
306
gpgme_strsource(rc), gpgme_strerror(rc));
307
return false;
169
308
}
170
309
while(engine_info != NULL){
171
310
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
172
311
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
173
engine_info->file_name, homedir);
312
engine_info->file_name, tempdir);
174
313
break;
175
314
}
176
315
engine_info = engine_info->next;
177
316
}
178
317
if(engine_info == NULL){
179
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
180
return -1;
318
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
319
tempdir);
320
return false;
321
}
322
323
/* Create new GPGME "context" */
324
rc = gpgme_new(&(mc.ctx));
325
if(rc != GPG_ERR_NO_ERROR){
326
fprintf_plus(stderr, "Mandos plugin mandos-client: "
327
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
328
gpgme_strerror(rc));
329
return false;
330
}
331
332
if(not import_key(pubkey) or not import_key(seckey)){
333
return false;
334
}
335
336
return true;
337
}
338
339
/*
340
* Decrypt OpenPGP data.
341
* Returns -1 on error
342
*/
343
static ssize_t pgp_packet_decrypt(const char *cryptotext,
344
size_t crypto_size,
345
char **plaintext){
346
gpgme_data_t dh_crypto, dh_plain;
347
gpgme_error_t rc;
348
ssize_t ret;
349
size_t plaintext_capacity = 0;
350
ssize_t plaintext_length = 0;
351
352
if(debug){
353
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
181
354
}
182
355
183
356
/* Create new GPGME data buffer from memory cryptotext */
184
357
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
185
358
0);
186
if (rc != GPG_ERR_NO_ERROR){
187
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
188
gpgme_strsource(rc), gpgme_strerror(rc));
359
if(rc != GPG_ERR_NO_ERROR){
360
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
361
gpgme_strsource(rc), gpgme_strerror(rc));
189
362
return -1;
190
363
}
191
364
192
365
/* Create new empty GPGME data buffer for the plaintext */
193
366
rc = gpgme_data_new(&dh_plain);
194
if (rc != GPG_ERR_NO_ERROR){
195
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
196
gpgme_strsource(rc), gpgme_strerror(rc));
367
if(rc != GPG_ERR_NO_ERROR){
368
fprintf_plus(stderr, "Mandos plugin mandos-client: "
369
"bad gpgme_data_new: %s: %s\n",
370
gpgme_strsource(rc), gpgme_strerror(rc));
197
371
gpgme_data_release(dh_crypto);
198
372
return -1;
199
373
}
200
374
201
/* Create new GPGME "context" */
202
rc = gpgme_new(&ctx);
203
if (rc != GPG_ERR_NO_ERROR){
204
fprintf(stderr, "bad gpgme_new: %s: %s\n",
205
gpgme_strsource(rc), gpgme_strerror(rc));
206
plaintext_length = -1;
207
goto decrypt_end;
208
}
209
210
375
/* Decrypt data from the cryptotext data buffer to the plaintext
211
376
data buffer */
212
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
213
if (rc != GPG_ERR_NO_ERROR){
214
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
215
gpgme_strsource(rc), gpgme_strerror(rc));
377
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
378
if(rc != GPG_ERR_NO_ERROR){
379
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
380
gpgme_strsource(rc), gpgme_strerror(rc));
216
381
plaintext_length = -1;
217
if (debug){
382
if(debug){
218
383
gpgme_decrypt_result_t result;
219
result = gpgme_op_decrypt_result(ctx);
220
if (result == NULL){
221
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
384
result = gpgme_op_decrypt_result(mc.ctx);
385
if(result == NULL){
386
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
222
387
} else {
223
fprintf(stderr, "Unsupported algorithm: %s\n",
224
result->unsupported_algorithm);
225
fprintf(stderr, "Wrong key usage: %u\n",
226
result->wrong_key_usage);
388
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
389
result->unsupported_algorithm);
390
fprintf_plus(stderr, "Wrong key usage: %u\n",
391
result->wrong_key_usage);
227
392
if(result->file_name != NULL){
228
fprintf(stderr, "File name: %s\n", result->file_name);
393
fprintf_plus(stderr, "File name: %s\n", result->file_name);
229
394
}
230
395
gpgme_recipient_t recipient;
231
396
recipient = result->recipients;
232
if(recipient){
233
while(recipient != NULL){
234
fprintf(stderr, "Public key algorithm: %s\n",
235
gpgme_pubkey_algo_name(recipient->pubkey_algo));
236
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
237
fprintf(stderr, "Secret key available: %s\n",
238
recipient->status == GPG_ERR_NO_SECKEY
239
? "No" : "Yes");
240
recipient = recipient->next;
241
}
397
while(recipient != NULL){
398
fprintf_plus(stderr, "Public key algorithm: %s\n",
399
gpgme_pubkey_algo_name
400
(recipient->pubkey_algo));
401
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
402
fprintf_plus(stderr, "Secret key available: %s\n",
403
recipient->status == GPG_ERR_NO_SECKEY
404
? "No" : "Yes");
405
recipient = recipient->next;
242
406
}
243
407
}
244
408
}
246
410
}
247
411
248
412
if(debug){
249
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
413
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
250
414
}
251
415
252
416
/* Seek back to the beginning of the GPGME plaintext data buffer */
253
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
254
perror("pgpme_data_seek");
417
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
418
perror_plus("gpgme_data_seek");
255
419
plaintext_length = -1;
256
420
goto decrypt_end;
257
421
}
258
422
259
423
*plaintext = NULL;
260
424
while(true){
261
plaintext_capacity = adjustbuffer(plaintext,
262
(size_t)plaintext_length,
263
plaintext_capacity);
264
if (plaintext_capacity == 0){
265
perror("adjustbuffer");
266
plaintext_length = -1;
267
goto decrypt_end;
425
plaintext_capacity = incbuffer(plaintext,
426
(size_t)plaintext_length,
427
plaintext_capacity);
428
if(plaintext_capacity == 0){
429
perror_plus("incbuffer");
430
plaintext_length = -1;
431
goto decrypt_end;
268
432
}
269
433
270
434
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
271
435
BUFFER_SIZE);
272
436
/* Print the data, if any */
273
if (ret == 0){
437
if(ret == 0){
274
438
/* EOF */
275
439
break;
276
440
}
277
441
if(ret < 0){
278
perror("gpgme_data_read");
442
perror_plus("gpgme_data_read");
279
443
plaintext_length = -1;
280
444
goto decrypt_end;
281
445
}
282
446
plaintext_length += ret;
283
447
}
284
448
285
449
if(debug){
286
fprintf(stderr, "Decrypted password is: ");
450
fprintf_plus(stderr, "Decrypted password is: ");
287
451
for(ssize_t i = 0; i < plaintext_length; i++){
288
452
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
289
453
}
300
464
return plaintext_length;
301
465
}
302
466
303
static const char * safer_gnutls_strerror (int value) {
304
const char *ret = gnutls_strerror (value); /* Spurious warning */
305
if (ret == NULL)
467
static const char * safer_gnutls_strerror(int value){
468
const char *ret = gnutls_strerror(value); /* Spurious warning from
469
-Wunreachable-code */
470
if(ret == NULL)
306
471
ret = "(unknown)";
307
472
return ret;
308
473
}
310
475
/* GnuTLS log function callback */
311
476
static void debuggnutls(__attribute__((unused)) int level,
312
477
const char* string){
313
fprintf(stderr, "GnuTLS: %s", string);
478
fprintf_plus(stderr, "GnuTLS: %s", string);
314
479
}
315
480
316
static int init_gnutls_global(mandos_context *mc,
317
const char *pubkeyfilename,
481
static int init_gnutls_global(const char *pubkeyfilename,
318
482
const char *seckeyfilename){
319
483
int ret;
320
484
321
485
if(debug){
322
fprintf(stderr, "Initializing GnuTLS\n");
486
fprintf_plus(stderr, "Initializing GnuTLS\n");
323
487
}
324
488
325
489
ret = gnutls_global_init();
326
if (ret != GNUTLS_E_SUCCESS) {
327
fprintf (stderr, "GnuTLS global_init: %s\n",
328
safer_gnutls_strerror(ret));
490
if(ret != GNUTLS_E_SUCCESS){
491
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
492
safer_gnutls_strerror(ret));
329
493
return -1;
330
494
}
331
495
332
if (debug){
496
if(debug){
333
497
/* "Use a log level over 10 to enable all debugging options."
334
498
* - GnuTLS manual
335
499
*/
338
502
}
339
503
340
504
/* OpenPGP credentials */
341
gnutls_certificate_allocate_credentials(&mc->cred);
342
if (ret != GNUTLS_E_SUCCESS){
343
fprintf (stderr, "GnuTLS memory error: %s\n", /* Spurious
344
warning */
345
safer_gnutls_strerror(ret));
346
gnutls_global_deinit ();
505
ret = gnutls_certificate_allocate_credentials(&mc.cred);
506
if(ret != GNUTLS_E_SUCCESS){
507
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
508
safer_gnutls_strerror(ret));
509
gnutls_global_deinit();
347
510
return -1;
348
511
}
349
512
350
513
if(debug){
351
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
352
" and keyfile %s as GnuTLS credentials\n", pubkeyfilename,
353
seckeyfilename);
514
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
515
" secret key %s as GnuTLS credentials\n",
516
pubkeyfilename,
517
seckeyfilename);
354
518
}
355
519
356
520
ret = gnutls_certificate_set_openpgp_key_file
357
(mc->cred, pubkeyfilename, seckeyfilename,
521
(mc.cred, pubkeyfilename, seckeyfilename,
358
522
GNUTLS_OPENPGP_FMT_BASE64);
359
if (ret != GNUTLS_E_SUCCESS) {
360
fprintf(stderr,
361
"Error[%d] while reading the OpenPGP key pair ('%s',"
362
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
363
fprintf(stdout, "The GnuTLS error is: %s\n",
364
safer_gnutls_strerror(ret));
523
if(ret != GNUTLS_E_SUCCESS){
524
fprintf_plus(stderr,
525
"Error[%d] while reading the OpenPGP key pair ('%s',"
526
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
527
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
528
safer_gnutls_strerror(ret));
365
529
goto globalfail;
366
530
}
367
531
368
532
/* GnuTLS server initialization */
369
ret = gnutls_dh_params_init(&mc->dh_params);
370
if (ret != GNUTLS_E_SUCCESS) {
371
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
372
" %s\n", safer_gnutls_strerror(ret));
373
goto globalfail;
374
}
375
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
376
if (ret != GNUTLS_E_SUCCESS) {
377
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
378
safer_gnutls_strerror(ret));
379
goto globalfail;
380
}
381
382
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
383
533
ret = gnutls_dh_params_init(&mc.dh_params);
534
if(ret != GNUTLS_E_SUCCESS){
535
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
536
" initialization: %s\n",
537
safer_gnutls_strerror(ret));
538
goto globalfail;
539
}
540
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
541
if(ret != GNUTLS_E_SUCCESS){
542
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
543
safer_gnutls_strerror(ret));
544
goto globalfail;
545
}
546
547
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
548
384
549
return 0;
385
550
386
551
globalfail:
387
388
gnutls_certificate_free_credentials(mc->cred);
552
553
gnutls_certificate_free_credentials(mc.cred);
389
554
gnutls_global_deinit();
555
gnutls_dh_params_deinit(mc.dh_params);
390
556
return -1;
391
392
557
}
393
558
394
static int init_gnutls_session(mandos_context *mc,
395
gnutls_session_t *session){
559
static int init_gnutls_session(gnutls_session_t *session){
396
560
int ret;
397
561
/* GnuTLS session creation */
398
ret = gnutls_init(session, GNUTLS_SERVER);
399
if (ret != GNUTLS_E_SUCCESS){
400
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
401
safer_gnutls_strerror(ret));
562
do {
563
ret = gnutls_init(session, GNUTLS_SERVER);
564
if(quit_now){
565
return -1;
566
}
567
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
568
if(ret != GNUTLS_E_SUCCESS){
569
fprintf_plus(stderr,
570
"Error in GnuTLS session initialization: %s\n",
571
safer_gnutls_strerror(ret));
402
572
}
403
573
404
574
{
405
575
const char *err;
406
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
407
if (ret != GNUTLS_E_SUCCESS) {
408
fprintf(stderr, "Syntax error at: %s\n", err);
409
fprintf(stderr, "GnuTLS error: %s\n",
410
safer_gnutls_strerror(ret));
411
gnutls_deinit (*session);
576
do {
577
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
578
if(quit_now){
579
gnutls_deinit(*session);
580
return -1;
581
}
582
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
583
if(ret != GNUTLS_E_SUCCESS){
584
fprintf_plus(stderr, "Syntax error at: %s\n", err);
585
fprintf_plus(stderr, "GnuTLS error: %s\n",
586
safer_gnutls_strerror(ret));
587
gnutls_deinit(*session);
412
588
return -1;
413
589
}
414
590
}
415
591
416
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
417
mc->cred);
418
if (ret != GNUTLS_E_SUCCESS) {
419
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
420
safer_gnutls_strerror(ret));
421
gnutls_deinit (*session);
592
do {
593
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
594
mc.cred);
595
if(quit_now){
596
gnutls_deinit(*session);
597
return -1;
598
}
599
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
600
if(ret != GNUTLS_E_SUCCESS){
601
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
602
safer_gnutls_strerror(ret));
603
gnutls_deinit(*session);
422
604
return -1;
423
605
}
424
606
425
607
/* ignore client certificate if any. */
426
gnutls_certificate_server_set_request (*session,
427
GNUTLS_CERT_IGNORE);
608
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
428
609
429
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
610
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
430
611
431
612
return 0;
432
613
}
438
619
/* Called when a Mandos server is found */
439
620
static int start_mandos_communication(const char *ip, uint16_t port,
440
621
AvahiIfIndex if_index,
441
mandos_context *mc){
442
int ret, tcp_sd;
443
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
622
int af){
623
int ret, tcp_sd = -1;
624
ssize_t sret;
625
union {
626
struct sockaddr_in in;
627
struct sockaddr_in6 in6;
628
} to;
444
629
char *buffer = NULL;
445
char *decrypted_buffer;
630
char *decrypted_buffer = NULL;
446
631
size_t buffer_length = 0;
447
632
size_t buffer_capacity = 0;
448
ssize_t decrypted_buffer_size;
449
633
size_t written;
450
int retval = 0;
451
char interface[IF_NAMESIZE];
634
int retval = -1;
452
635
gnutls_session_t session;
453
454
ret = init_gnutls_session (mc, &session);
455
if (ret != 0){
456
return -1;
457
}
458
459
if(debug){
460
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
461
"\n", ip, port);
462
}
463
464
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
465
if(tcp_sd < 0) {
466
perror("socket");
467
return -1;
468
}
469
470
if(debug){
471
if(if_indextoname((unsigned int)if_index, interface) == NULL){
472
perror("if_indextoname");
473
return -1;
474
}
475
fprintf(stderr, "Binding to interface %s\n", interface);
636
int pf; /* Protocol family */
637
638
errno = 0;
639
640
if(quit_now){
641
errno = EINTR;
642
return -1;
643
}
644
645
switch(af){
646
case AF_INET6:
647
pf = PF_INET6;
648
break;
649
case AF_INET:
650
pf = PF_INET;
651
break;
652
default:
653
fprintf_plus(stderr, "Bad address family: %d\n", af);
654
errno = EINVAL;
655
return -1;
656
}
657
658
ret = init_gnutls_session(&session);
659
if(ret != 0){
660
return -1;
661
}
662
663
if(debug){
664
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
665
PRIu16 "\n", ip, port);
666
}
667
668
tcp_sd = socket(pf, SOCK_STREAM, 0);
669
if(tcp_sd < 0){
670
int e = errno;
671
perror_plus("socket");
672
errno = e;
673
goto mandos_end;
674
}
675
676
if(quit_now){
677
errno = EINTR;
678
goto mandos_end;
476
679
}
477
680
478
681
memset(&to, 0, sizeof(to));
479
to.in6.sin6_family = AF_INET6;
480
/* It would be nice to have a way to detect if we were passed an
481
IPv4 address here. Now we assume an IPv6 address. */
482
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
483
if (ret < 0 ){
484
perror("inet_pton");
485
return -1;
682
if(af == AF_INET6){
683
to.in6.sin6_family = (sa_family_t)af;
684
ret = inet_pton(af, ip, &to.in6.sin6_addr);
685
} else { /* IPv4 */
686
to.in.sin_family = (sa_family_t)af;
687
ret = inet_pton(af, ip, &to.in.sin_addr);
688
}
689
if(ret < 0 ){
690
int e = errno;
691
perror_plus("inet_pton");
692
errno = e;
693
goto mandos_end;
486
694
}
487
695
if(ret == 0){
488
fprintf(stderr, "Bad address: %s\n", ip);
489
return -1;
490
}
491
to.in6.sin6_port = htons(port); /* Spurious warning */
696
int e = errno;
697
fprintf_plus(stderr, "Bad address: %s\n", ip);
698
errno = e;
699
goto mandos_end;
700
}
701
if(af == AF_INET6){
702
to.in6.sin6_port = htons(port); /* Spurious warnings from
703
-Wconversion and
704
-Wunreachable-code */
705
706
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
707
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
708
-Wunreachable-code*/
709
if(if_index == AVAHI_IF_UNSPEC){
710
fprintf_plus(stderr, "An IPv6 link-local address is"
711
" incomplete without a network interface\n");
712
errno = EINVAL;
713
goto mandos_end;
714
}
715
/* Set the network interface number as scope */
716
to.in6.sin6_scope_id = (uint32_t)if_index;
717
}
718
} else {
719
to.in.sin_port = htons(port); /* Spurious warnings from
720
-Wconversion and
721
-Wunreachable-code */
722
}
492
723
493
to.in6.sin6_scope_id = (uint32_t)if_index;
724
if(quit_now){
725
errno = EINTR;
726
goto mandos_end;
727
}
494
728
495
729
if(debug){
496
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
497
port);
498
char addrstr[INET6_ADDRSTRLEN] = "";
499
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
500
sizeof(addrstr)) == NULL){
501
perror("inet_ntop");
730
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
731
char interface[IF_NAMESIZE];
732
if(if_indextoname((unsigned int)if_index, interface) == NULL){
733
perror_plus("if_indextoname");
734
} else {
735
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
736
"\n", ip, interface, port);
737
}
738
} else {
739
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
740
ip, port);
741
}
742
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
743
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
744
const char *pcret;
745
if(af == AF_INET6){
746
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
747
sizeof(addrstr));
748
} else {
749
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
750
sizeof(addrstr));
751
}
752
if(pcret == NULL){
753
perror_plus("inet_ntop");
502
754
} else {
503
755
if(strcmp(addrstr, ip) != 0){
504
fprintf(stderr, "Canonical address form: %s\n", addrstr);
756
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
505
757
}
506
758
}
507
759
}
508
760
509
ret = connect(tcp_sd, &to.in, sizeof(to));
510
if (ret < 0){
511
perror("connect");
512
return -1;
513
}
514
761
if(quit_now){
762
errno = EINTR;
763
goto mandos_end;
764
}
765
766
if(af == AF_INET6){
767
ret = connect(tcp_sd, &to.in6, sizeof(to));
768
} else {
769
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
770
}
771
if(ret < 0){
772
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
773
int e = errno;
774
perror_plus("connect");
775
errno = e;
776
}
777
goto mandos_end;
778
}
779
780
if(quit_now){
781
errno = EINTR;
782
goto mandos_end;
783
}
784
515
785
const char *out = mandos_protocol_version;
516
786
written = 0;
517
while (true){
787
while(true){
518
788
size_t out_size = strlen(out);
519
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
520
out_size - written));
521
if (ret == -1){
522
perror("write");
523
retval = -1;
789
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
790
out_size - written));
791
if(ret == -1){
792
int e = errno;
793
perror_plus("write");
794
errno = e;
524
795
goto mandos_end;
525
796
}
526
797
written += (size_t)ret;
527
798
if(written < out_size){
528
799
continue;
529
800
} else {
530
if (out == mandos_protocol_version){
801
if(out == mandos_protocol_version){
531
802
written = 0;
532
803
out = "\r\n";
533
804
} else {
534
805
break;
535
806
}
536
807
}
808
809
if(quit_now){
810
errno = EINTR;
811
goto mandos_end;
812
}
537
813
}
538
814
539
815
if(debug){
540
fprintf(stderr, "Establishing TLS session with %s\n", ip);
541
}
542
543
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
544
545
do{
546
ret = gnutls_handshake (session);
816
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
817
}
818
819
if(quit_now){
820
errno = EINTR;
821
goto mandos_end;
822
}
823
824
/* Spurious warning from -Wint-to-pointer-cast */
825
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
826
827
if(quit_now){
828
errno = EINTR;
829
goto mandos_end;
830
}
831
832
do {
833
ret = gnutls_handshake(session);
834
if(quit_now){
835
errno = EINTR;
836
goto mandos_end;
837
}
547
838
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
548
839
549
if (ret != GNUTLS_E_SUCCESS){
840
if(ret != GNUTLS_E_SUCCESS){
550
841
if(debug){
551
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
552
gnutls_perror (ret);
842
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
843
gnutls_perror(ret);
553
844
}
554
retval = -1;
845
errno = EPROTO;
555
846
goto mandos_end;
556
847
}
557
848
558
849
/* Read OpenPGP packet that contains the wanted password */
559
850
560
851
if(debug){
561
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
562
ip);
852
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
853
" %s\n", ip);
563
854
}
564
855
565
856
while(true){
566
buffer_capacity = adjustbuffer(&buffer, buffer_length,
567
buffer_capacity);
568
if (buffer_capacity == 0){
569
perror("adjustbuffer");
570
retval = -1;
571
goto mandos_end;
572
}
573
574
ret = gnutls_record_recv(session, buffer+buffer_length,
575
BUFFER_SIZE);
576
if (ret == 0){
857
858
if(quit_now){
859
errno = EINTR;
860
goto mandos_end;
861
}
862
863
buffer_capacity = incbuffer(&buffer, buffer_length,
864
buffer_capacity);
865
if(buffer_capacity == 0){
866
int e = errno;
867
perror_plus("incbuffer");
868
errno = e;
869
goto mandos_end;
870
}
871
872
if(quit_now){
873
errno = EINTR;
874
goto mandos_end;
875
}
876
877
sret = gnutls_record_recv(session, buffer+buffer_length,
878
BUFFER_SIZE);
879
if(sret == 0){
577
880
break;
578
881
}
579
if (ret < 0){
580
switch(ret){
882
if(sret < 0){
883
switch(sret){
581
884
case GNUTLS_E_INTERRUPTED:
582
885
case GNUTLS_E_AGAIN:
583
886
break;
584
887
case GNUTLS_E_REHANDSHAKE:
585
do{
586
ret = gnutls_handshake (session);
888
do {
889
ret = gnutls_handshake(session);
890
891
if(quit_now){
892
errno = EINTR;
893
goto mandos_end;
894
}
587
895
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
588
if (ret < 0){
589
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
590
gnutls_perror (ret);
591
retval = -1;
896
if(ret < 0){
897
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
898
"***\n");
899
gnutls_perror(ret);
900
errno = EPROTO;
592
901
goto mandos_end;
593
902
}
594
903
break;
595
904
default:
596
fprintf(stderr, "Unknown error while reading data from"
597
" encrypted session with Mandos server\n");
598
retval = -1;
599
gnutls_bye (session, GNUTLS_SHUT_RDWR);
905
fprintf_plus(stderr, "Unknown error while reading data from"
906
" encrypted session with Mandos server\n");
907
gnutls_bye(session, GNUTLS_SHUT_RDWR);
908
errno = EIO;
600
909
goto mandos_end;
601
910
}
602
911
} else {
603
buffer_length += (size_t) ret;
912
buffer_length += (size_t) sret;
604
913
}
605
914
}
606
915
607
916
if(debug){
608
fprintf(stderr, "Closing TLS session\n");
609
}
610
611
gnutls_bye (session, GNUTLS_SHUT_RDWR);
612
613
if (buffer_length > 0){
614
decrypted_buffer_size = pgp_packet_decrypt(buffer,
615
buffer_length,
616
&decrypted_buffer,
617
keydir);
618
if (decrypted_buffer_size >= 0){
917
fprintf_plus(stderr, "Closing TLS session\n");
918
}
919
920
if(quit_now){
921
errno = EINTR;
922
goto mandos_end;
923
}
924
925
do {
926
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
927
if(quit_now){
928
errno = EINTR;
929
goto mandos_end;
930
}
931
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
932
933
if(buffer_length > 0){
934
ssize_t decrypted_buffer_size;
935
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
936
&decrypted_buffer);
937
if(decrypted_buffer_size >= 0){
938
619
939
written = 0;
620
940
while(written < (size_t) decrypted_buffer_size){
621
ret = (int)fwrite (decrypted_buffer + written, 1,
622
(size_t)decrypted_buffer_size - written,
623
stdout);
941
if(quit_now){
942
errno = EINTR;
943
goto mandos_end;
944
}
945
946
ret = (int)fwrite(decrypted_buffer + written, 1,
947
(size_t)decrypted_buffer_size - written,
948
stdout);
624
949
if(ret == 0 and ferror(stdout)){
950
int e = errno;
625
951
if(debug){
626
fprintf(stderr, "Error writing encrypted data: %s\n",
627
strerror(errno));
952
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
953
strerror(errno));
628
954
}
629
retval = -1;
630
break;
955
errno = e;
956
goto mandos_end;
631
957
}
632
958
written += (size_t)ret;
633
959
}
634
free(decrypted_buffer);
635
} else {
636
retval = -1;
960
retval = 0;
637
961
}
638
} else {
639
retval = -1;
640
962
}
641
963
642
964
/* Shutdown procedure */
643
965
644
966
mandos_end:
645
free(buffer);
646
close(tcp_sd);
647
gnutls_deinit (session);
967
{
968
int e = errno;
969
free(decrypted_buffer);
970
free(buffer);
971
if(tcp_sd >= 0){
972
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
973
}
974
if(ret == -1){
975
if(e == 0){
976
e = errno;
977
}
978
perror_plus("close");
979
}
980
gnutls_deinit(session);
981
errno = e;
982
if(quit_now){
983
errno = EINTR;
984
retval = -1;
985
}
986
}
648
987
return retval;
649
988
}
650
989
651
990
static void resolve_callback(AvahiSServiceResolver *r,
652
991
AvahiIfIndex interface,
653
AVAHI_GCC_UNUSED AvahiProtocol protocol,
992
AvahiProtocol proto,
654
993
AvahiResolverEvent event,
655
994
const char *name,
656
995
const char *type,
661
1000
AVAHI_GCC_UNUSED AvahiStringList *txt,
662
1001
AVAHI_GCC_UNUSED AvahiLookupResultFlags
663
1002
flags,
664
void* userdata) {
665
mandos_context *mc = userdata;
1003
AVAHI_GCC_UNUSED void* userdata){
666
1004
assert(r);
667
1005
668
1006
/* Called whenever a service has been resolved successfully or
669
1007
timed out */
670
1008
671
switch (event) {
1009
if(quit_now){
1010
return;
1011
}
1012
1013
switch(event){
672
1014
default:
673
1015
case AVAHI_RESOLVER_FAILURE:
674
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
675
" of type '%s' in domain '%s': %s\n", name, type, domain,
676
avahi_strerror(avahi_server_errno(mc->server)));
1016
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1017
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1018
domain,
1019
avahi_strerror(avahi_server_errno(mc.server)));
677
1020
break;
678
1021
679
1022
case AVAHI_RESOLVER_FOUND:
681
1024
char ip[AVAHI_ADDRESS_STR_MAX];
682
1025
avahi_address_snprint(ip, sizeof(ip), address);
683
1026
if(debug){
684
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
685
PRIu16 ") on port %d\n", name, host_name, ip,
686
interface, port);
1027
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1028
PRIdMAX ") on port %" PRIu16 "\n", name,
1029
host_name, ip, (intmax_t)interface, port);
687
1030
}
688
int ret = start_mandos_communication(ip, port, interface, mc);
689
if (ret == 0){
690
avahi_simple_poll_quit(mc->simple_poll);
1031
int ret = start_mandos_communication(ip, port, interface,
1032
avahi_proto_to_af(proto));
1033
if(ret == 0){
1034
avahi_simple_poll_quit(mc.simple_poll);
1035
} else {
1036
if(not add_server(ip, port, interface,
1037
avahi_proto_to_af(proto))){
1038
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1039
" list\n", name);
1040
}
691
1041
}
692
1042
}
693
1043
}
694
1044
avahi_s_service_resolver_free(r);
695
1045
}
696
1046
697
static void browse_callback( AvahiSServiceBrowser *b,
698
AvahiIfIndex interface,
699
AvahiProtocol protocol,
700
AvahiBrowserEvent event,
701
const char *name,
702
const char *type,
703
const char *domain,
704
AVAHI_GCC_UNUSED AvahiLookupResultFlags
705
flags,
706
void* userdata) {
707
mandos_context *mc = userdata;
1047
static void browse_callback(AvahiSServiceBrowser *b,
1048
AvahiIfIndex interface,
1049
AvahiProtocol protocol,
1050
AvahiBrowserEvent event,
1051
const char *name,
1052
const char *type,
1053
const char *domain,
1054
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1055
flags,
1056
AVAHI_GCC_UNUSED void* userdata){
708
1057
assert(b);
709
1058
710
1059
/* Called whenever a new services becomes available on the LAN or
711
1060
is removed from the LAN */
712
1061
713
switch (event) {
1062
if(quit_now){
1063
return;
1064
}
1065
1066
switch(event){
714
1067
default:
715
1068
case AVAHI_BROWSER_FAILURE:
716
1069
717
fprintf(stderr, "(Avahi browser) %s\n",
718
avahi_strerror(avahi_server_errno(mc->server)));
719
avahi_simple_poll_quit(mc->simple_poll);
1070
fprintf_plus(stderr, "(Avahi browser) %s\n",
1071
avahi_strerror(avahi_server_errno(mc.server)));
1072
avahi_simple_poll_quit(mc.simple_poll);
720
1073
return;
721
1074
722
1075
case AVAHI_BROWSER_NEW:
725
1078
the callback function is called the Avahi server will free the
726
1079
resolver for us. */
727
1080
728
if (!(avahi_s_service_resolver_new(mc->server, interface,
729
protocol, name, type, domain,
730
AVAHI_PROTO_INET6, 0,
731
resolve_callback, mc)))
732
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
733
name, avahi_strerror(avahi_server_errno(mc->server)));
1081
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1082
name, type, domain, protocol, 0,
1083
resolve_callback, NULL) == NULL)
1084
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1085
" %s\n", name,
1086
avahi_strerror(avahi_server_errno(mc.server)));
734
1087
break;
735
1088
736
1089
case AVAHI_BROWSER_REMOVE:
739
1092
case AVAHI_BROWSER_ALL_FOR_NOW:
740
1093
case AVAHI_BROWSER_CACHE_EXHAUSTED:
741
1094
if(debug){
742
fprintf(stderr, "No Mandos server found, still searching...\n");
1095
fprintf_plus(stderr, "No Mandos server found, still"
1096
" searching...\n");
743
1097
}
744
1098
break;
745
1099
}
746
1100
}
747
1101
748
/* Combines file name and path and returns the malloced new
749
string. some sane checks could/should be added */
750
static char *combinepath(const char *first, const char *second){
1102
/* Signal handler that stops main loop after SIGTERM */
1103
static void handle_sigterm(int sig){
1104
if(quit_now){
1105
return;
1106
}
1107
quit_now = 1;
1108
signal_received = sig;
1109
int old_errno = errno;
1110
/* set main loop to exit */
1111
if(mc.simple_poll != NULL){
1112
avahi_simple_poll_quit(mc.simple_poll);
1113
}
1114
errno = old_errno;
1115
}
1116
1117
bool get_flags(const char *ifname, struct ifreq *ifr){
1118
int ret;
1119
1120
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1121
if(s < 0){
1122
perror_plus("socket");
1123
return false;
1124
}
1125
strcpy(ifr->ifr_name, ifname);
1126
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1127
if(ret == -1){
1128
if(debug){
1129
perror_plus("ioctl SIOCGIFFLAGS");
1130
}
1131
return false;
1132
}
1133
return true;
1134
}
1135
1136
bool good_flags(const char *ifname, const struct ifreq *ifr){
1137
1138
/* Reject the loopback device */
1139
if(ifr->ifr_flags & IFF_LOOPBACK){
1140
if(debug){
1141
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1142
ifname);
1143
}
1144
return false;
1145
}
1146
/* Accept point-to-point devices only if connect_to is specified */
1147
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1148
if(debug){
1149
fprintf_plus(stderr, "Accepting point-to-point interface"
1150
" \"%s\"\n", ifname);
1151
}
1152
return true;
1153
}
1154
/* Otherwise, reject non-broadcast-capable devices */
1155
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1156
if(debug){
1157
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1158
" \"%s\"\n", ifname);
1159
}
1160
return false;
1161
}
1162
/* Reject non-ARP interfaces (including dummy interfaces) */
1163
if(ifr->ifr_flags & IFF_NOARP){
1164
if(debug){
1165
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1166
ifname);
1167
}
1168
return false;
1169
}
1170
1171
/* Accept this device */
1172
if(debug){
1173
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1174
}
1175
return true;
1176
}
1177
1178
/*
1179
* This function determines if a directory entry in /sys/class/net
1180
* corresponds to an acceptable network device.
1181
* (This function is passed to scandir(3) as a filter function.)
1182
*/
1183
int good_interface(const struct dirent *if_entry){
1184
if(if_entry->d_name[0] == '.'){
1185
return 0;
1186
}
1187
1188
struct ifreq ifr;
1189
if(not get_flags(if_entry->d_name, &ifr)){
1190
if(debug){
1191
fprintf_plus(stderr, "Failed to get flags for interface "
1192
"\"%s\"\n", if_entry->d_name);
1193
}
1194
return 0;
1195
}
1196
1197
if(not good_flags(if_entry->d_name, &ifr)){
1198
return 0;
1199
}
1200
return 1;
1201
}
1202
1203
/*
1204
* This function determines if a directory entry in /sys/class/net
1205
* corresponds to an acceptable network device which is up.
1206
* (This function is passed to scandir(3) as a filter function.)
1207
*/
1208
int up_interface(const struct dirent *if_entry){
1209
if(if_entry->d_name[0] == '.'){
1210
return 0;
1211
}
1212
1213
struct ifreq ifr;
1214
if(not get_flags(if_entry->d_name, &ifr)){
1215
if(debug){
1216
fprintf_plus(stderr, "Failed to get flags for interface "
1217
"\"%s\"\n", if_entry->d_name);
1218
}
1219
return 0;
1220
}
1221
1222
/* Reject down interfaces */
1223
if(not (ifr.ifr_flags & IFF_UP)){
1224
if(debug){
1225
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1226
if_entry->d_name);
1227
}
1228
return 0;
1229
}
1230
1231
/* Reject non-running interfaces */
1232
if(not (ifr.ifr_flags & IFF_RUNNING)){
1233
if(debug){
1234
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1235
if_entry->d_name);
1236
}
1237
return 0;
1238
}
1239
1240
if(not good_flags(if_entry->d_name, &ifr)){
1241
return 0;
1242
}
1243
return 1;
1244
}
1245
1246
int notdotentries(const struct dirent *direntry){
1247
/* Skip "." and ".." */
1248
if(direntry->d_name[0] == '.'
1249
and (direntry->d_name[1] == '\0'
1250
or (direntry->d_name[1] == '.'
1251
and direntry->d_name[2] == '\0'))){
1252
return 0;
1253
}
1254
return 1;
1255
}
1256
1257
/* Is this directory entry a runnable program? */
1258
int runnable_hook(const struct dirent *direntry){
1259
int ret;
1260
size_t sret;
1261
struct stat st;
1262
1263
if((direntry->d_name)[0] == '\0'){
1264
/* Empty name? */
1265
return 0;
1266
}
1267
1268
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1269
"abcdefghijklmnopqrstuvwxyz"
1270
"0123456789"
1271
"_-");
1272
if((direntry->d_name)[sret] != '\0'){
1273
/* Contains non-allowed characters */
1274
if(debug){
1275
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1276
direntry->d_name);
1277
}
1278
return 0;
1279
}
1280
1281
char *fullname = NULL;
1282
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1283
if(ret < 0){
1284
perror_plus("asprintf");
1285
return 0;
1286
}
1287
1288
ret = stat(fullname, &st);
1289
if(ret == -1){
1290
if(debug){
1291
perror_plus("Could not stat hook");
1292
}
1293
return 0;
1294
}
1295
if(not (S_ISREG(st.st_mode))){
1296
/* Not a regular file */
1297
if(debug){
1298
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1299
direntry->d_name);
1300
}
1301
return 0;
1302
}
1303
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1304
/* Not executable */
1305
if(debug){
1306
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1307
direntry->d_name);
1308
}
1309
return 0;
1310
}
1311
if(debug){
1312
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1313
direntry->d_name);
1314
}
1315
return 1;
1316
}
1317
1318
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1319
int ret;
1320
struct timespec now;
1321
struct timespec waited_time;
1322
intmax_t block_time;
1323
1324
while(true){
1325
if(mc.current_server == NULL){
1326
if (debug){
1327
fprintf_plus(stderr, "Wait until first server is found."
1328
" No timeout!\n");
1329
}
1330
ret = avahi_simple_poll_iterate(s, -1);
1331
} else {
1332
if (debug){
1333
fprintf_plus(stderr, "Check current_server if we should run"
1334
" it, or wait\n");
1335
}
1336
/* the current time */
1337
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1338
if(ret == -1){
1339
perror_plus("clock_gettime");
1340
return -1;
1341
}
1342
/* Calculating in ms how long time between now and server
1343
who we visted longest time ago. Now - last seen. */
1344
waited_time.tv_sec = (now.tv_sec
1345
- mc.current_server->last_seen.tv_sec);
1346
waited_time.tv_nsec = (now.tv_nsec
1347
- mc.current_server->last_seen.tv_nsec);
1348
/* total time is 10s/10,000ms.
1349
Converting to s from ms by dividing by 1,000,
1350
and ns to ms by dividing by 1,000,000. */
1351
block_time = ((retry_interval
1352
- ((intmax_t)waited_time.tv_sec * 1000))
1353
- ((intmax_t)waited_time.tv_nsec / 1000000));
1354
1355
if (debug){
1356
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1357
block_time);
1358
}
1359
1360
if(block_time <= 0){
1361
ret = start_mandos_communication(mc.current_server->ip,
1362
mc.current_server->port,
1363
mc.current_server->if_index,
1364
mc.current_server->af);
1365
if(ret == 0){
1366
avahi_simple_poll_quit(mc.simple_poll);
1367
return 0;
1368
}
1369
ret = clock_gettime(CLOCK_MONOTONIC,
1370
&mc.current_server->last_seen);
1371
if(ret == -1){
1372
perror_plus("clock_gettime");
1373
return -1;
1374
}
1375
mc.current_server = mc.current_server->next;
1376
block_time = 0; /* Call avahi to find new Mandos
1377
servers, but don't block */
1378
}
1379
1380
ret = avahi_simple_poll_iterate(s, (int)block_time);
1381
}
1382
if(ret != 0){
1383
if (ret > 0 or errno != EINTR){
1384
return (ret != 1) ? ret : 0;
1385
}
1386
}
1387
}
1388
}
1389
1390
bool run_network_hooks(const char *mode, const char *interface,
1391
const float delay){
1392
struct dirent **direntries;
1393
struct dirent *direntry;
1394
int ret;
1395
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1396
alphasort);
1397
if(numhooks == -1){
1398
perror_plus("scandir");
1399
} else {
1400
int devnull = open("/dev/null", O_RDONLY);
1401
for(int i = 0; i < numhooks; i++){
1402
direntry = direntries[i];
1403
char *fullname = NULL;
1404
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1405
if(ret < 0){
1406
perror_plus("asprintf");
1407
continue;
1408
}
1409
if(debug){
1410
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1411
direntry->d_name);
1412
}
1413
pid_t hook_pid = fork();
1414
if(hook_pid == 0){
1415
/* Child */
1416
/* Raise privileges */
1417
errno = 0;
1418
ret = seteuid(0);
1419
if(ret == -1){
1420
perror_plus("seteuid");
1421
}
1422
/* Raise privileges even more */
1423
errno = 0;
1424
ret = setuid(0);
1425
if(ret == -1){
1426
perror_plus("setuid");
1427
}
1428
/* Set group */
1429
errno = 0;
1430
ret = setgid(0);
1431
if(ret == -1){
1432
perror_plus("setgid");
1433
}
1434
/* Reset supplementary groups */
1435
errno = 0;
1436
ret = setgroups(0, NULL);
1437
if(ret == -1){
1438
perror_plus("setgroups");
1439
}
1440
dup2(devnull, STDIN_FILENO);
1441
close(devnull);
1442
dup2(STDERR_FILENO, STDOUT_FILENO);
1443
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1444
if(ret == -1){
1445
perror_plus("setenv");
1446
_exit(EX_OSERR);
1447
}
1448
ret = setenv("DEVICE", interface, 1);
1449
if(ret == -1){
1450
perror_plus("setenv");
1451
_exit(EX_OSERR);
1452
}
1453
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1454
if(ret == -1){
1455
perror_plus("setenv");
1456
_exit(EX_OSERR);
1457
}
1458
ret = setenv("MODE", mode, 1);
1459
if(ret == -1){
1460
perror_plus("setenv");
1461
_exit(EX_OSERR);
1462
}
1463
char *delaystring;
1464
ret = asprintf(&delaystring, "%f", delay);
1465
if(ret == -1){
1466
perror_plus("asprintf");
1467
_exit(EX_OSERR);
1468
}
1469
ret = setenv("DELAY", delaystring, 1);
1470
if(ret == -1){
1471
free(delaystring);
1472
perror_plus("setenv");
1473
_exit(EX_OSERR);
1474
}
1475
free(delaystring);
1476
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1477
perror_plus("execl");
1478
_exit(EXIT_FAILURE);
1479
}
1480
} else {
1481
int status;
1482
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1483
perror_plus("waitpid");
1484
free(fullname);
1485
continue;
1486
}
1487
if(WIFEXITED(status)){
1488
if(WEXITSTATUS(status) != 0){
1489
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1490
" with status %d\n", direntry->d_name,
1491
WEXITSTATUS(status));
1492
free(fullname);
1493
continue;
1494
}
1495
} else if(WIFSIGNALED(status)){
1496
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1497
" signal %d\n", direntry->d_name,
1498
WTERMSIG(status));
1499
free(fullname);
1500
continue;
1501
} else {
1502
fprintf_plus(stderr, "Warning: network hook \"%s\""
1503
" crashed\n", direntry->d_name);
1504
free(fullname);
1505
continue;
1506
}
1507
}
1508
free(fullname);
1509
if(debug){
1510
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1511
direntry->d_name);
1512
}
1513
}
1514
close(devnull);
1515
}
1516
return true;
1517
}
1518
1519
int main(int argc, char *argv[]){
1520
AvahiSServiceBrowser *sb = NULL;
1521
int error;
1522
int ret;
1523
intmax_t tmpmax;
751
1524
char *tmp;
752
int ret = asprintf(&tmp, "%s/%s", first, second);
753
if(ret < 0){
754
return NULL;
755
}
756
return tmp;
757
}
758
759
760
int main(int argc, char *argv[]){
761
AvahiSServiceBrowser *sb = NULL;
762
int error;
763
int ret;
764
int exitcode = EXIT_SUCCESS;
765
const char *interface = "eth0";
766
struct ifreq network;
767
int sd;
768
uid_t uid;
769
gid_t gid;
770
char *connect_to = NULL;
771
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
772
char *pubkeyfilename = NULL;
773
char *seckeyfilename = NULL;
774
const char *pubkeyname = "pubkey.txt";
775
const char *seckeyname = "seckey.txt";
776
mandos_context mc = { .simple_poll = NULL, .server = NULL,
777
.dh_bits = 1024, .priority = "SECURE256"};
778
bool gnutls_initalized = false;
779
780
{
781
struct argp_option options[] = {
782
{ .name = "debug", .key = 128,
783
.doc = "Debug mode", .group = 3 },
784
{ .name = "connect", .key = 'c',
785
.arg = "IP",
786
.doc = "Connect directly to a sepcified mandos server",
787
.group = 1 },
788
{ .name = "interface", .key = 'i',
789
.arg = "INTERFACE",
790
.doc = "Interface that Avahi will conntect through",
791
.group = 1 },
792
{ .name = "keydir", .key = 'd',
793
.arg = "KEYDIR",
794
.doc = "Directory where the openpgp keyring is",
795
.group = 1 },
796
{ .name = "seckey", .key = 's',
797
.arg = "SECKEY",
798
.doc = "Secret openpgp key for gnutls authentication",
799
.group = 1 },
800
{ .name = "pubkey", .key = 'p',
801
.arg = "PUBKEY",
802
.doc = "Public openpgp key for gnutls authentication",
803
.group = 2 },
804
{ .name = "dh-bits", .key = 129,
805
.arg = "BITS",
806
.doc = "dh-bits to use in gnutls communication",
807
.group = 2 },
808
{ .name = "priority", .key = 130,
809
.arg = "PRIORITY",
810
.doc = "GNUTLS priority", .group = 1 },
811
{ .name = NULL }
812
};
813
814
815
error_t parse_opt (int key, char *arg,
816
struct argp_state *state) {
817
/* Get the INPUT argument from `argp_parse', which we know is
818
a pointer to our plugin list pointer. */
819
switch (key) {
820
case 128:
821
debug = true;
822
break;
823
case 'c':
824
connect_to = arg;
825
break;
826
case 'i':
827
interface = arg;
828
break;
829
case 'd':
830
keydir = arg;
831
break;
832
case 's':
833
seckeyname = arg;
834
break;
835
case 'p':
836
pubkeyname = arg;
837
break;
838
case 129:
839
errno = 0;
840
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
841
if (errno){
842
perror("strtol");
843
exit(EXIT_FAILURE);
844
}
845
break;
846
case 130:
847
mc.priority = arg;
848
break;
849
case ARGP_KEY_ARG:
850
argp_usage (state);
851
case ARGP_KEY_END:
852
break;
853
default:
854
return ARGP_ERR_UNKNOWN;
855
}
856
return 0;
857
}
858
859
struct argp argp = { .options = options, .parser = parse_opt,
860
.args_doc = "",
861
.doc = "Mandos client -- Get and decrypt"
862
" passwords from mandos server" };
863
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
864
if (ret == ARGP_ERR_UNKNOWN){
865
fprintf(stderr, "Unknown error while parsing arguments\n");
866
exitcode = EXIT_FAILURE;
867
goto end;
868
}
869
}
870
871
pubkeyfilename = combinepath(keydir, pubkeyname);
872
if (pubkeyfilename == NULL){
873
perror("combinepath");
874
exitcode = EXIT_FAILURE;
875
goto end;
876
}
877
878
seckeyfilename = combinepath(keydir, seckeyname);
879
if (seckeyfilename == NULL){
880
perror("combinepath");
881
exitcode = EXIT_FAILURE;
882
goto end;
883
}
884
885
ret = init_gnutls_global(&mc, pubkeyfilename, seckeyfilename);
886
if (ret == -1){
887
fprintf(stderr, "init_gnutls_global failed\n");
888
exitcode = EXIT_FAILURE;
889
goto end;
1525
int exitcode = EXIT_SUCCESS;
1526
const char *interface = "";
1527
struct ifreq network;
1528
int sd = -1;
1529
bool take_down_interface = false;
1530
uid_t uid;
1531
gid_t gid;
1532
char tempdir[] = "/tmp/mandosXXXXXX";
1533
bool tempdir_created = false;
1534
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1535
const char *seckey = PATHDIR "/" SECKEY;
1536
const char *pubkey = PATHDIR "/" PUBKEY;
1537
1538
bool gnutls_initialized = false;
1539
bool gpgme_initialized = false;
1540
float delay = 2.5f;
1541
double retry_interval = 10; /* 10s between trying a server and
1542
retrying the same server again */
1543
1544
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1545
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1546
1547
uid = getuid();
1548
gid = getgid();
1549
1550
/* Lower any group privileges we might have, just to be safe */
1551
errno = 0;
1552
ret = setgid(gid);
1553
if(ret == -1){
1554
perror_plus("setgid");
1555
}
1556
1557
/* Lower user privileges (temporarily) */
1558
errno = 0;
1559
ret = seteuid(uid);
1560
if(ret == -1){
1561
perror_plus("seteuid");
1562
}
1563
1564
if(quit_now){
1565
goto end;
1566
}
1567
1568
{
1569
struct argp_option options[] = {
1570
{ .name = "debug", .key = 128,
1571
.doc = "Debug mode", .group = 3 },
1572
{ .name = "connect", .key = 'c',
1573
.arg = "ADDRESS:PORT",
1574
.doc = "Connect directly to a specific Mandos server",
1575
.group = 1 },
1576
{ .name = "interface", .key = 'i',
1577
.arg = "NAME",
1578
.doc = "Network interface that will be used to search for"
1579
" Mandos servers",
1580
.group = 1 },
1581
{ .name = "seckey", .key = 's',
1582
.arg = "FILE",
1583
.doc = "OpenPGP secret key file base name",
1584
.group = 1 },
1585
{ .name = "pubkey", .key = 'p',
1586
.arg = "FILE",
1587
.doc = "OpenPGP public key file base name",
1588
.group = 2 },
1589
{ .name = "dh-bits", .key = 129,
1590
.arg = "BITS",
1591
.doc = "Bit length of the prime number used in the"
1592
" Diffie-Hellman key exchange",
1593
.group = 2 },
1594
{ .name = "priority", .key = 130,
1595
.arg = "STRING",
1596
.doc = "GnuTLS priority string for the TLS handshake",
1597
.group = 1 },
1598
{ .name = "delay", .key = 131,
1599
.arg = "SECONDS",
1600
.doc = "Maximum delay to wait for interface startup",
1601
.group = 2 },
1602
{ .name = "retry", .key = 132,
1603
.arg = "SECONDS",
1604
.doc = "Retry interval used when denied by the mandos server",
1605
.group = 2 },
1606
{ .name = "network-hook-dir", .key = 133,
1607
.arg = "DIR",
1608
.doc = "Directory where network hooks are located",
1609
.group = 2 },
1610
/*
1611
* These reproduce what we would get without ARGP_NO_HELP
1612
*/
1613
{ .name = "help", .key = '?',
1614
.doc = "Give this help list", .group = -1 },
1615
{ .name = "usage", .key = -3,
1616
.doc = "Give a short usage message", .group = -1 },
1617
{ .name = "version", .key = 'V',
1618
.doc = "Print program version", .group = -1 },
1619
{ .name = NULL }
1620
};
1621
1622
error_t parse_opt(int key, char *arg,
1623
struct argp_state *state){
1624
errno = 0;
1625
switch(key){
1626
case 128: /* --debug */
1627
debug = true;
1628
break;
1629
case 'c': /* --connect */
1630
connect_to = arg;
1631
break;
1632
case 'i': /* --interface */
1633
interface = arg;
1634
break;
1635
case 's': /* --seckey */
1636
seckey = arg;
1637
break;
1638
case 'p': /* --pubkey */
1639
pubkey = arg;
1640
break;
1641
case 129: /* --dh-bits */
1642
errno = 0;
1643
tmpmax = strtoimax(arg, &tmp, 10);
1644
if(errno != 0 or tmp == arg or *tmp != '\0'
1645
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1646
argp_error(state, "Bad number of DH bits");
1647
}
1648
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1649
break;
1650
case 130: /* --priority */
1651
mc.priority = arg;
1652
break;
1653
case 131: /* --delay */
1654
errno = 0;
1655
delay = strtof(arg, &tmp);
1656
if(errno != 0 or tmp == arg or *tmp != '\0'){
1657
argp_error(state, "Bad delay");
1658
}
1659
case 132: /* --retry */
1660
errno = 0;
1661
retry_interval = strtod(arg, &tmp);
1662
if(errno != 0 or tmp == arg or *tmp != '\0'
1663
or (retry_interval * 1000) > INT_MAX
1664
or retry_interval < 0){
1665
argp_error(state, "Bad retry interval");
1666
}
1667
break;
1668
case 133: /* --network-hook-dir */
1669
hookdir = arg;
1670
break;
1671
/*
1672
* These reproduce what we would get without ARGP_NO_HELP
1673
*/
1674
case '?': /* --help */
1675
argp_state_help(state, state->out_stream,
1676
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1677
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1678
case -3: /* --usage */
1679
argp_state_help(state, state->out_stream,
1680
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1681
case 'V': /* --version */
1682
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1683
exit(argp_err_exit_status);
1684
break;
1685
default:
1686
return ARGP_ERR_UNKNOWN;
1687
}
1688
return errno;
1689
}
1690
1691
struct argp argp = { .options = options, .parser = parse_opt,
1692
.args_doc = "",
1693
.doc = "Mandos client -- Get and decrypt"
1694
" passwords from a Mandos server" };
1695
ret = argp_parse(&argp, argc, argv,
1696
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1697
switch(ret){
1698
case 0:
1699
break;
1700
case ENOMEM:
1701
default:
1702
errno = ret;
1703
perror_plus("argp_parse");
1704
exitcode = EX_OSERR;
1705
goto end;
1706
case EINVAL:
1707
exitcode = EX_USAGE;
1708
goto end;
1709
}
1710
}
1711
1712
{
1713
/* Work around Debian bug #633582:
1714
<http://bugs.debian.org/633582> */
1715
1716
/* Re-raise priviliges */
1717
errno = 0;
1718
ret = seteuid(0);
1719
if(ret == -1){
1720
perror_plus("seteuid");
890
1721
} else {
891
gnutls_initalized = true;
892
}
893
894
/* If the interface is down, bring it up */
895
{
896
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
897
if(sd < 0) {
898
perror("socket");
899
exitcode = EXIT_FAILURE;
900
goto end;
901
}
902
strcpy(network.ifr_name, interface);
903
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1722
struct stat st;
1723
1724
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1725
int seckey_fd = open(seckey, O_RDONLY);
1726
if(seckey_fd == -1){
1727
perror_plus("open");
1728
} else {
1729
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1730
if(ret == -1){
1731
perror_plus("fstat");
1732
} else {
1733
if(S_ISREG(st.st_mode)
1734
and st.st_uid == 0 and st.st_gid == 0){
1735
ret = fchown(seckey_fd, uid, gid);
1736
if(ret == -1){
1737
perror_plus("fchown");
1738
}
1739
}
1740
}
1741
TEMP_FAILURE_RETRY(close(seckey_fd));
1742
}
1743
}
1744
1745
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1746
int pubkey_fd = open(pubkey, O_RDONLY);
1747
if(pubkey_fd == -1){
1748
perror_plus("open");
1749
} else {
1750
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1751
if(ret == -1){
1752
perror_plus("fstat");
1753
} else {
1754
if(S_ISREG(st.st_mode)
1755
and st.st_uid == 0 and st.st_gid == 0){
1756
ret = fchown(pubkey_fd, uid, gid);
1757
if(ret == -1){
1758
perror_plus("fchown");
1759
}
1760
}
1761
}
1762
TEMP_FAILURE_RETRY(close(pubkey_fd));
1763
}
1764
}
1765
1766
/* Lower privileges */
1767
errno = 0;
1768
ret = seteuid(uid);
904
1769
if(ret == -1){
905
perror("ioctl SIOCGIFFLAGS");
1770
perror_plus("seteuid");
1771
}
1772
}
1773
}
1774
1775
/* Run network hooks */
1776
if(not run_network_hooks("start", interface, delay)){
1777
goto end;
1778
}
1779
1780
if(not debug){
1781
avahi_set_log_function(empty_log);
1782
}
1783
1784
if(interface[0] == '\0'){
1785
struct dirent **direntries;
1786
/* First look for interfaces that are up */
1787
ret = scandir(sys_class_net, &direntries, up_interface,
1788
alphasort);
1789
if(ret == 0){
1790
/* No up interfaces, look for any good interfaces */
1791
free(direntries);
1792
ret = scandir(sys_class_net, &direntries, good_interface,
1793
alphasort);
1794
}
1795
if(ret >= 1){
1796
/* Pick the first interface returned */
1797
interface = strdup(direntries[0]->d_name);
1798
if(debug){
1799
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1800
}
1801
if(interface == NULL){
1802
perror_plus("malloc");
1803
free(direntries);
906
1804
exitcode = EXIT_FAILURE;
907
1805
goto end;
908
1806
}
909
if((network.ifr_flags & IFF_UP) == 0){
910
network.ifr_flags |= IFF_UP;
911
ret = ioctl(sd, SIOCSIFFLAGS, &network);
912
if(ret == -1){
913
perror("ioctl SIOCSIFFLAGS");
914
exitcode = EXIT_FAILURE;
915
goto end;
916
}
917
}
918
close(sd);
919
}
920
921
uid = getuid();
922
gid = getgid();
923
924
ret = setuid(uid);
925
if (ret == -1){
926
perror("setuid");
927
}
928
929
setgid(gid);
930
if (ret == -1){
931
perror("setgid");
932
}
933
1807
free(direntries);
1808
} else {
1809
free(direntries);
1810
fprintf_plus(stderr, "Could not find a network interface\n");
1811
exitcode = EXIT_FAILURE;
1812
goto end;
1813
}
1814
}
1815
1816
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1817
from the signal handler */
1818
/* Initialize the pseudo-RNG for Avahi */
1819
srand((unsigned int) time(NULL));
1820
mc.simple_poll = avahi_simple_poll_new();
1821
if(mc.simple_poll == NULL){
1822
fprintf_plus(stderr,
1823
"Avahi: Failed to create simple poll object.\n");
1824
exitcode = EX_UNAVAILABLE;
1825
goto end;
1826
}
1827
1828
sigemptyset(&sigterm_action.sa_mask);
1829
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1830
if(ret == -1){
1831
perror_plus("sigaddset");
1832
exitcode = EX_OSERR;
1833
goto end;
1834
}
1835
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1836
if(ret == -1){
1837
perror_plus("sigaddset");
1838
exitcode = EX_OSERR;
1839
goto end;
1840
}
1841
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1842
if(ret == -1){
1843
perror_plus("sigaddset");
1844
exitcode = EX_OSERR;
1845
goto end;
1846
}
1847
/* Need to check if the handler is SIG_IGN before handling:
1848
| [[info:libc:Initial Signal Actions]] |
1849
| [[info:libc:Basic Signal Handling]] |
1850
*/
1851
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1852
if(ret == -1){
1853
perror_plus("sigaction");
1854
return EX_OSERR;
1855
}
1856
if(old_sigterm_action.sa_handler != SIG_IGN){
1857
ret = sigaction(SIGINT, &sigterm_action, NULL);
1858
if(ret == -1){
1859
perror_plus("sigaction");
1860
exitcode = EX_OSERR;
1861
goto end;
1862
}
1863
}
1864
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1865
if(ret == -1){
1866
perror_plus("sigaction");
1867
return EX_OSERR;
1868
}
1869
if(old_sigterm_action.sa_handler != SIG_IGN){
1870
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1871
if(ret == -1){
1872
perror_plus("sigaction");
1873
exitcode = EX_OSERR;
1874
goto end;
1875
}
1876
}
1877
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1878
if(ret == -1){
1879
perror_plus("sigaction");
1880
return EX_OSERR;
1881
}
1882
if(old_sigterm_action.sa_handler != SIG_IGN){
1883
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1884
if(ret == -1){
1885
perror_plus("sigaction");
1886
exitcode = EX_OSERR;
1887
goto end;
1888
}
1889
}
1890
1891
/* If the interface is down, bring it up */
1892
if(strcmp(interface, "none") != 0){
934
1893
if_index = (AvahiIfIndex) if_nametoindex(interface);
935
1894
if(if_index == 0){
936
fprintf(stderr, "No such interface: \"%s\"\n", interface);
937
exit(EXIT_FAILURE);
938
}
939
940
if(connect_to != NULL){
941
/* Connect directly, do not use Zeroconf */
942
/* (Mainly meant for debugging) */
943
char *address = strrchr(connect_to, ':');
944
if(address == NULL){
945
fprintf(stderr, "No colon in address\n");
946
exitcode = EXIT_FAILURE;
947
goto end;
948
}
949
errno = 0;
950
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
951
if(errno){
952
perror("Bad port number");
953
exitcode = EXIT_FAILURE;
954
goto end;
955
}
956
*address = '\0';
957
address = connect_to;
958
ret = start_mandos_communication(address, port, if_index, &mc);
959
if(ret < 0){
960
exitcode = EXIT_FAILURE;
961
} else {
962
exitcode = EXIT_SUCCESS;
963
}
964
goto end;
965
}
966
967
if (not debug){
968
avahi_set_log_function(empty_log);
969
}
970
971
/* Initialize the pseudo-RNG for Avahi */
972
srand((unsigned int) time(NULL));
973
974
/* Allocate main Avahi loop object */
975
mc.simple_poll = avahi_simple_poll_new();
976
if (mc.simple_poll == NULL) {
977
fprintf(stderr, "Avahi: Failed to create simple poll"
978
" object.\n");
979
exitcode = EXIT_FAILURE;
980
goto end;
981
}
982
983
{
984
AvahiServerConfig config;
985
/* Do not publish any local Zeroconf records */
986
avahi_server_config_init(&config);
987
config.publish_hinfo = 0;
988
config.publish_addresses = 0;
989
config.publish_workstation = 0;
990
config.publish_domain = 0;
991
992
/* Allocate a new server */
993
mc.server = avahi_server_new(avahi_simple_poll_get
994
(mc.simple_poll), &config, NULL,
995
NULL, &error);
996
997
/* Free the Avahi configuration data */
998
avahi_server_config_free(&config);
999
}
1000
1001
/* Check if creating the Avahi server object succeeded */
1002
if (mc.server == NULL) {
1003
fprintf(stderr, "Failed to create Avahi server: %s\n",
1004
avahi_strerror(error));
1005
exitcode = EXIT_FAILURE;
1006
goto end;
1007
}
1008
1009
/* Create the Avahi service browser */
1010
sb = avahi_s_service_browser_new(mc.server, if_index,
1011
AVAHI_PROTO_INET6,
1012
"_mandos._tcp", NULL, 0,
1013
browse_callback, &mc);
1014
if (sb == NULL) {
1015
fprintf(stderr, "Failed to create service browser: %s\n",
1016
avahi_strerror(avahi_server_errno(mc.server)));
1017
exitcode = EXIT_FAILURE;
1018
goto end;
1019
}
1020
1021
/* Run the main loop */
1022
1023
if (debug){
1024
fprintf(stderr, "Starting Avahi loop search\n");
1025
}
1026
1027
avahi_simple_poll_loop(mc.simple_poll);
1028
1895
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1896
exitcode = EX_UNAVAILABLE;
1897
goto end;
1898
}
1899
1900
if(quit_now){
1901
goto end;
1902
}
1903
1904
/* Re-raise priviliges */
1905
errno = 0;
1906
ret = seteuid(0);
1907
if(ret == -1){
1908
perror_plus("seteuid");
1909
}
1910
1911
#ifdef __linux__
1912
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1913
messages about the network interface to mess up the prompt */
1914
ret = klogctl(8, NULL, 5);
1915
bool restore_loglevel = true;
1916
if(ret == -1){
1917
restore_loglevel = false;
1918
perror_plus("klogctl");
1919
}
1920
#endif /* __linux__ */
1921
1922
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1923
if(sd < 0){
1924
perror_plus("socket");
1925
exitcode = EX_OSERR;
1926
#ifdef __linux__
1927
if(restore_loglevel){
1928
ret = klogctl(7, NULL, 0);
1929
if(ret == -1){
1930
perror_plus("klogctl");
1931
}
1932
}
1933
#endif /* __linux__ */
1934
/* Lower privileges */
1935
errno = 0;
1936
ret = seteuid(uid);
1937
if(ret == -1){
1938
perror_plus("seteuid");
1939
}
1940
goto end;
1941
}
1942
strcpy(network.ifr_name, interface);
1943
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1944
if(ret == -1){
1945
perror_plus("ioctl SIOCGIFFLAGS");
1946
#ifdef __linux__
1947
if(restore_loglevel){
1948
ret = klogctl(7, NULL, 0);
1949
if(ret == -1){
1950
perror_plus("klogctl");
1951
}
1952
}
1953
#endif /* __linux__ */
1954
exitcode = EX_OSERR;
1955
/* Lower privileges */
1956
errno = 0;
1957
ret = seteuid(uid);
1958
if(ret == -1){
1959
perror_plus("seteuid");
1960
}
1961
goto end;
1962
}
1963
if((network.ifr_flags & IFF_UP) == 0){
1964
network.ifr_flags |= IFF_UP;
1965
take_down_interface = true;
1966
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1967
if(ret == -1){
1968
take_down_interface = false;
1969
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1970
exitcode = EX_OSERR;
1971
#ifdef __linux__
1972
if(restore_loglevel){
1973
ret = klogctl(7, NULL, 0);
1974
if(ret == -1){
1975
perror_plus("klogctl");
1976
}
1977
}
1978
#endif /* __linux__ */
1979
/* Lower privileges */
1980
errno = 0;
1981
ret = seteuid(uid);
1982
if(ret == -1){
1983
perror_plus("seteuid");
1984
}
1985
goto end;
1986
}
1987
}
1988
/* Sleep checking until interface is running.
1989
Check every 0.25s, up to total time of delay */
1990
for(int i=0; i < delay * 4; i++){
1991
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1992
if(ret == -1){
1993
perror_plus("ioctl SIOCGIFFLAGS");
1994
} else if(network.ifr_flags & IFF_RUNNING){
1995
break;
1996
}
1997
struct timespec sleeptime = { .tv_nsec = 250000000 };
1998
ret = nanosleep(&sleeptime, NULL);
1999
if(ret == -1 and errno != EINTR){
2000
perror_plus("nanosleep");
2001
}
2002
}
2003
if(not take_down_interface){
2004
/* We won't need the socket anymore */
2005
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2006
if(ret == -1){
2007
perror_plus("close");
2008
}
2009
}
2010
#ifdef __linux__
2011
if(restore_loglevel){
2012
/* Restores kernel loglevel to default */
2013
ret = klogctl(7, NULL, 0);
2014
if(ret == -1){
2015
perror_plus("klogctl");
2016
}
2017
}
2018
#endif /* __linux__ */
2019
/* Lower privileges */
2020
errno = 0;
2021
/* Lower privileges */
2022
ret = seteuid(uid);
2023
if(ret == -1){
2024
perror_plus("seteuid");
2025
}
2026
}
2027
2028
if(quit_now){
2029
goto end;
2030
}
2031
2032
ret = init_gnutls_global(pubkey, seckey);
2033
if(ret == -1){
2034
fprintf_plus(stderr, "init_gnutls_global failed\n");
2035
exitcode = EX_UNAVAILABLE;
2036
goto end;
2037
} else {
2038
gnutls_initialized = true;
2039
}
2040
2041
if(quit_now){
2042
goto end;
2043
}
2044
2045
if(mkdtemp(tempdir) == NULL){
2046
perror_plus("mkdtemp");
2047
goto end;
2048
}
2049
tempdir_created = true;
2050
2051
if(quit_now){
2052
goto end;
2053
}
2054
2055
if(not init_gpgme(pubkey, seckey, tempdir)){
2056
fprintf_plus(stderr, "init_gpgme failed\n");
2057
exitcode = EX_UNAVAILABLE;
2058
goto end;
2059
} else {
2060
gpgme_initialized = true;
2061
}
2062
2063
if(quit_now){
2064
goto end;
2065
}
2066
2067
if(connect_to != NULL){
2068
/* Connect directly, do not use Zeroconf */
2069
/* (Mainly meant for debugging) */
2070
char *address = strrchr(connect_to, ':');
2071
if(address == NULL){
2072
fprintf_plus(stderr, "No colon in address\n");
2073
exitcode = EX_USAGE;
2074
goto end;
2075
}
2076
2077
if(quit_now){
2078
goto end;
2079
}
2080
2081
uint16_t port;
2082
errno = 0;
2083
tmpmax = strtoimax(address+1, &tmp, 10);
2084
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2085
or tmpmax != (uint16_t)tmpmax){
2086
fprintf_plus(stderr, "Bad port number\n");
2087
exitcode = EX_USAGE;
2088
goto end;
2089
}
2090
2091
if(quit_now){
2092
goto end;
2093
}
2094
2095
port = (uint16_t)tmpmax;
2096
*address = '\0';
2097
/* Colon in address indicates IPv6 */
2098
int af;
2099
if(strchr(connect_to, ':') != NULL){
2100
af = AF_INET6;
2101
/* Accept [] around IPv6 address - see RFC 5952 */
2102
if(connect_to[0] == '[' and address[-1] == ']')
2103
{
2104
connect_to++;
2105
address[-1] = '\0';
2106
}
2107
} else {
2108
af = AF_INET;
2109
}
2110
address = connect_to;
2111
2112
if(quit_now){
2113
goto end;
2114
}
2115
2116
while(not quit_now){
2117
ret = start_mandos_communication(address, port, if_index, af);
2118
if(quit_now or ret == 0){
2119
break;
2120
}
2121
if(debug){
2122
fprintf_plus(stderr, "Retrying in %d seconds\n",
2123
(int)retry_interval);
2124
}
2125
sleep((int)retry_interval);
2126
}
2127
2128
if (not quit_now){
2129
exitcode = EXIT_SUCCESS;
2130
}
2131
2132
goto end;
2133
}
2134
2135
if(quit_now){
2136
goto end;
2137
}
2138
2139
{
2140
AvahiServerConfig config;
2141
/* Do not publish any local Zeroconf records */
2142
avahi_server_config_init(&config);
2143
config.publish_hinfo = 0;
2144
config.publish_addresses = 0;
2145
config.publish_workstation = 0;
2146
config.publish_domain = 0;
2147
2148
/* Allocate a new server */
2149
mc.server = avahi_server_new(avahi_simple_poll_get
2150
(mc.simple_poll), &config, NULL,
2151
NULL, &error);
2152
2153
/* Free the Avahi configuration data */
2154
avahi_server_config_free(&config);
2155
}
2156
2157
/* Check if creating the Avahi server object succeeded */
2158
if(mc.server == NULL){
2159
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2160
avahi_strerror(error));
2161
exitcode = EX_UNAVAILABLE;
2162
goto end;
2163
}
2164
2165
if(quit_now){
2166
goto end;
2167
}
2168
2169
/* Create the Avahi service browser */
2170
sb = avahi_s_service_browser_new(mc.server, if_index,
2171
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2172
NULL, 0, browse_callback, NULL);
2173
if(sb == NULL){
2174
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2175
avahi_strerror(avahi_server_errno(mc.server)));
2176
exitcode = EX_UNAVAILABLE;
2177
goto end;
2178
}
2179
2180
if(quit_now){
2181
goto end;
2182
}
2183
2184
/* Run the main loop */
2185
2186
if(debug){
2187
fprintf_plus(stderr, "Starting Avahi loop search\n");
2188
}
2189
2190
ret = avahi_loop_with_timeout(mc.simple_poll,
2191
(int)(retry_interval * 1000));
2192
if(debug){
2193
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2194
(ret == 0) ? "successfully" : "with error");
2195
}
2196
1029
2197
end:
1030
1031
if (debug){
1032
fprintf(stderr, "%s exiting\n", argv[0]);
1033
}
1034
1035
/* Cleanup things */
1036
if (sb != NULL)
1037
avahi_s_service_browser_free(sb);
1038
1039
if (mc.server != NULL)
1040
avahi_server_free(mc.server);
1041
1042
if (mc.simple_poll != NULL)
1043
avahi_simple_poll_free(mc.simple_poll);
1044
free(pubkeyfilename);
1045
free(seckeyfilename);
1046
1047
if (gnutls_initalized){
1048
gnutls_certificate_free_credentials(mc.cred);
1049
gnutls_global_deinit ();
1050
}
1051
1052
return exitcode;
2198
2199
if(debug){
2200
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2201
}
2202
2203
/* Cleanup things */
2204
if(sb != NULL)
2205
avahi_s_service_browser_free(sb);
2206
2207
if(mc.server != NULL)
2208
avahi_server_free(mc.server);
2209
2210
if(mc.simple_poll != NULL)
2211
avahi_simple_poll_free(mc.simple_poll);
2212
2213
if(gnutls_initialized){
2214
gnutls_certificate_free_credentials(mc.cred);
2215
gnutls_global_deinit();
2216
gnutls_dh_params_deinit(mc.dh_params);
2217
}
2218
2219
if(gpgme_initialized){
2220
gpgme_release(mc.ctx);
2221
}
2222
2223
/* Cleans up the circular linked list of Mandos servers the client
2224
has seen */
2225
if(mc.current_server != NULL){
2226
mc.current_server->prev->next = NULL;
2227
while(mc.current_server != NULL){
2228
server *next = mc.current_server->next;
2229
free(mc.current_server);
2230
mc.current_server = next;
2231
}
2232
}
2233
2234
/* Run network hooks */
2235
run_network_hooks("stop", interface, delay);
2236
2237
/* Re-raise priviliges */
2238
{
2239
errno = 0;
2240
ret = seteuid(0);
2241
if(ret == -1){
2242
perror_plus("seteuid");
2243
}
2244
2245
/* Take down the network interface */
2246
if(take_down_interface and geteuid() == 0){
2247
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2248
if(ret == -1){
2249
perror_plus("ioctl SIOCGIFFLAGS");
2250
} else if(network.ifr_flags & IFF_UP){
2251
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2252
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2253
if(ret == -1){
2254
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2255
}
2256
}
2257
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2258
if(ret == -1){
2259
perror_plus("close");
2260
}
2261
}
2262
}
2263
/* Lower privileges permanently */
2264
errno = 0;
2265
ret = setuid(uid);
2266
if(ret == -1){
2267
perror_plus("setuid");
2268
}
2269
2270
/* Removes the GPGME temp directory and all files inside */
2271
if(tempdir_created){
2272
struct dirent **direntries = NULL;
2273
struct dirent *direntry = NULL;
2274
int numentries = scandir(tempdir, &direntries, notdotentries,
2275
alphasort);
2276
if (numentries > 0){
2277
for(int i = 0; i < numentries; i++){
2278
direntry = direntries[i];
2279
char *fullname = NULL;
2280
ret = asprintf(&fullname, "%s/%s", tempdir,
2281
direntry->d_name);
2282
if(ret < 0){
2283
perror_plus("asprintf");
2284
continue;
2285
}
2286
ret = remove(fullname);
2287
if(ret == -1){
2288
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2289
strerror(errno));
2290
}
2291
free(fullname);
2292
}
2293
}
2294
2295
/* need to clean even if 0 because man page doesn't specify */
2296
free(direntries);
2297
if (numentries == -1){
2298
perror_plus("scandir");
2299
}
2300
ret = rmdir(tempdir);
2301
if(ret == -1 and errno != ENOENT){
2302
perror_plus("rmdir");
2303
}
2304
}
2305
2306
if(quit_now){
2307
sigemptyset(&old_sigterm_action.sa_mask);
2308
old_sigterm_action.sa_handler = SIG_DFL;
2309
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2310
&old_sigterm_action,
2311
NULL));
2312
if(ret == -1){
2313
perror_plus("sigaction");
2314
}
2315
do {
2316
ret = raise(signal_received);
2317
} while(ret != 0 and errno == EINTR);
2318
if(ret != 0){
2319
perror_plus("raise");
2320
abort();
2321
}
2322
TEMP_FAILURE_RETRY(pause());
2323
}
2324
2325
return exitcode;
1053
2326
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0