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- Committer: Teddy Hogeborn
- Date: 2008-08-16 03:29:08 UTC
- Revision ID: teddy@fukt.bsnet.se-20080816032908-ihw7c05r2mnyk389
Add feature to specify custom environment variables for plugins.
* plugin-runner.c (plugin): New members "environ" and "envc" to
contain possible custom environment.
(getplugin): Return NULL on failure instead of doing exit(); all
callers changed.
(add_to_char_array): New helper function for "add_argument" and
"add_environment".
(addargument): Renamed to "add_argument". Return bool. Call
"add_to_char_array" to actually do things.
(add_environment): New; analogous to "add_argument".
(addcustomargument): Renamed to "add_to_argv" to avoid confusion
with "add_argument".
(main): New options "--global-envs" and "--envs-for" to specify
custom environment for plugins. Print environment for
plugins in debug mode. Use asprintf instead of strcpy and
strcat. Use execve() for plugins with custom environments.
Free environment for plugin when freeing plugin list.
* plugin-runner.c (plugin): New members "environ" and "envc" to
contain possible custom environment.
(getplugin): Return NULL on failure instead of doing exit(); all
callers changed.
(add_to_char_array): New helper function for "add_argument" and
"add_environment".
(addargument): Renamed to "add_argument". Return bool. Call
"add_to_char_array" to actually do things.
(add_environment): New; analogous to "add_argument".
(addcustomargument): Renamed to "add_to_argv" to avoid confusion
with "add_argument".
(main): New options "--global-envs" and "--envs-for" to specify
custom environment for plugins. Print environment for
plugins in debug mode. Use asprintf instead of strcpy and
strcat. Use execve() for plugins with custom environments.
Free environment for plugin when freeing plugin list.
- files added:
- network-protocol.txt
- files removed:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- network-hooks.d
- files renamed:
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.xml
- files modified:
- Makefile
added
removed
plugins.d/password-request.c
1
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
* Mandos-client - get and decrypt data from a Mandos server
3
* Mandos client - get and decrypt data from a Mandos server
4
4
*
5
5
* This program is partly derived from an example program for an Avahi
6
6
* service browser, downloaded from
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
12
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
14
13
*
15
14
* This program is free software: you can redistribute it and/or
16
15
* modify it under the terms of the GNU General Public License as
26
25
* along with this program. If not, see
27
26
* <http://www.gnu.org/licenses/>.
28
27
*
29
* Contact the authors at <mandos@recompile.se>.
28
* Contact the authors at <mandos@fukt.bsnet.se>.
30
29
*/
31
30
32
31
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
34
32
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
37
33
#define _FILE_OFFSET_BITS 64
38
#endif
39
34
40
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
36
42
37
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
38
stdout, ferror() */
44
39
#include <stdint.h> /* uint16_t, uint32_t */
45
40
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
#include <stdbool.h> /* bool, false, true */
41
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
42
srand() */
43
#include <stdbool.h> /* bool, true */
49
44
#include <string.h> /* memset(), strcmp(), strlen(),
50
45
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
46
#include <sys/ioctl.h> /* ioctl */
52
47
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
48
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
49
SOCK_STREAM, INET6_ADDRSTRLEN,
50
uid_t, gid_t */
51
#include <inttypes.h> /* PRIu16 */
57
52
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
*/
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
53
struct in6_addr, inet_pton(),
54
connect() */
64
55
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
56
#include <errno.h> /* perror(), errno */
57
#include <time.h> /* time() */
68
58
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
59
SIOCSIFFLAGS, if_indextoname(),
70
60
if_nametoindex(), IF_NAMESIZE */
71
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
*/
74
61
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
78
#include <iso646.h> /* not, or, and */
62
getuid(), getgid(), setuid(),
63
setgid() */
64
#include <netinet/in.h>
65
#include <arpa/inet.h> /* inet_pton(), htons */
66
#include <iso646.h> /* not, and */
79
67
#include <argp.h> /* struct argp_option, error_t, struct
80
68
argp_state, struct argp,
81
69
argp_parse(), ARGP_KEY_ARG,
82
70
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
83
#include <signal.h> /* sigemptyset(), sigaddset(),
84
sigaction(), SIGTERM, sig_atomic_t,
85
raise() */
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
WEXITSTATUS(), WTERMSIG() */
90
#include <grp.h> /* setgroups() */
91
92
#ifdef __linux__
93
#include <sys/klog.h> /* klogctl() */
94
#endif /* __linux__ */
95
71
96
72
/* Avahi */
97
73
/* All Avahi types, constants and functions
110
86
gnutls_*
111
87
init_gnutls_session(),
112
88
GNUTLS_* */
113
#include <gnutls/openpgp.h>
114
/* gnutls_certificate_set_openpgp_key_file(),
115
GNUTLS_OPENPGP_FMT_BASE64 */
89
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
90
GNUTLS_OPENPGP_FMT_BASE64 */
116
91
117
92
/* GPGME */
118
93
#include <gpgme.h> /* All GPGME types, constants and
123
98
124
99
#define BUFFER_SIZE 256
125
100
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
131
101
bool debug = false;
102
static const char *keydir = "/conf/conf.d/mandos";
132
103
static const char mandos_protocol_version[] = "1";
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;
104
const char *argp_program_version = "password-request 1.0";
105
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
149
106
150
107
/* Used for passing in values through the Avahi callback functions */
151
108
typedef struct {
155
112
unsigned int dh_bits;
156
113
gnutls_dh_params_t dh_params;
157
114
const char *priority;
158
gpgme_ctx_t ctx;
159
server *current_server;
160
115
} mandos_context;
161
116
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
188
117
/*
189
* Make additional room in "buffer" for at least BUFFER_SIZE more
190
* bytes. "buffer_capacity" is how much is currently allocated,
118
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
119
* "buffer_capacity" is how much is currently allocated,
191
120
* "buffer_length" is how much is already used.
192
121
*/
193
size_t incbuffer(char **buffer, size_t buffer_length,
194
size_t buffer_capacity){
195
if(buffer_length + BUFFER_SIZE > buffer_capacity){
122
size_t adjustbuffer(char **buffer, size_t buffer_length,
123
size_t buffer_capacity){
124
if (buffer_length + BUFFER_SIZE > buffer_capacity){
196
125
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
197
if(buffer == NULL){
126
if (buffer == NULL){
198
127
return 0;
199
128
}
200
129
buffer_capacity += BUFFER_SIZE;
202
131
return buffer_capacity;
203
132
}
204
133
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
242
134
/*
243
* Initialize GPGME.
135
* Decrypt OpenPGP data using keyrings in HOMEDIR.
136
* Returns -1 on error
244
137
*/
245
static bool init_gpgme(const char *seckey, const char *pubkey,
246
const char *tempdir){
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
144
gpgme_error_t rc;
145
ssize_t ret;
146
size_t plaintext_capacity = 0;
147
ssize_t plaintext_length = 0;
248
148
gpgme_engine_info_t engine_info;
249
149
250
251
/*
252
* Helper function to insert pub and seckey to the engine keyring.
253
*/
254
bool import_key(const char *filename){
255
int ret;
256
int fd;
257
gpgme_data_t pgp_data;
258
259
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
260
if(fd == -1){
261
perror_plus("open");
262
return false;
263
}
264
265
rc = gpgme_data_new_from_fd(&pgp_data, 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));
280
if(ret == -1){
281
perror_plus("close");
282
}
283
gpgme_data_release(pgp_data);
284
return true;
285
}
286
287
if(debug){
288
fprintf_plus(stderr, "Initializing GPGME\n");
150
if (debug){
151
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
289
152
}
290
153
291
154
/* Init GPGME */
292
155
gpgme_check_version(NULL);
293
156
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
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));
297
return false;
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;
298
161
}
299
162
300
163
/* 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));
305
return false;
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;
306
169
}
307
170
while(engine_info != NULL){
308
171
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
309
172
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
310
engine_info->file_name, tempdir);
173
engine_info->file_name, homedir);
311
174
break;
312
175
}
313
176
engine_info = engine_info->next;
314
177
}
315
178
if(engine_info == NULL){
316
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
317
tempdir);
318
return false;
319
}
320
321
/* Create new GPGME "context" */
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;
335
}
336
337
/*
338
* Decrypt OpenPGP data.
339
* Returns -1 on error
340
*/
341
static ssize_t pgp_packet_decrypt(const char *cryptotext,
342
size_t crypto_size,
343
char **plaintext){
344
gpgme_data_t dh_crypto, dh_plain;
345
gpgme_error_t rc;
346
ssize_t ret;
347
size_t plaintext_capacity = 0;
348
ssize_t plaintext_length = 0;
349
350
if(debug){
351
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
179
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
180
return -1;
352
181
}
353
182
354
183
/* Create new GPGME data buffer from memory cryptotext */
355
184
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
356
185
0);
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));
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));
360
189
return -1;
361
190
}
362
191
363
192
/* Create new empty GPGME data buffer for the plaintext */
364
193
rc = gpgme_data_new(&dh_plain);
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));
194
if (rc != GPG_ERR_NO_ERROR){
195
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
196
gpgme_strsource(rc), gpgme_strerror(rc));
369
197
gpgme_data_release(dh_crypto);
370
198
return -1;
371
199
}
372
200
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
373
210
/* Decrypt data from the cryptotext data buffer to the plaintext
374
211
data buffer */
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));
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));
379
216
plaintext_length = -1;
380
if(debug){
381
gpgme_decrypt_result_t result;
382
result = gpgme_op_decrypt_result(mc.ctx);
383
if(result == NULL){
384
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
385
} else {
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);
390
if(result->file_name != NULL){
391
fprintf_plus(stderr, "File name: %s\n", result->file_name);
392
}
393
gpgme_recipient_t recipient;
394
recipient = result->recipients;
217
goto decrypt_end;
218
}
219
220
if(debug){
221
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
222
}
223
224
if (debug){
225
gpgme_decrypt_result_t result;
226
result = gpgme_op_decrypt_result(ctx);
227
if (result == NULL){
228
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
229
} else {
230
fprintf(stderr, "Unsupported algorithm: %s\n",
231
result->unsupported_algorithm);
232
fprintf(stderr, "Wrong key usage: %u\n",
233
result->wrong_key_usage);
234
if(result->file_name != NULL){
235
fprintf(stderr, "File name: %s\n", result->file_name);
236
}
237
gpgme_recipient_t recipient;
238
recipient = result->recipients;
239
if(recipient){
395
240
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");
241
fprintf(stderr, "Public key algorithm: %s\n",
242
gpgme_pubkey_algo_name(recipient->pubkey_algo));
243
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
244
fprintf(stderr, "Secret key available: %s\n",
245
recipient->status == GPG_ERR_NO_SECKEY
246
? "No" : "Yes");
403
247
recipient = recipient->next;
404
248
}
405
249
}
406
250
}
407
goto decrypt_end;
408
}
409
410
if(debug){
411
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
412
251
}
413
252
414
253
/* Seek back to the beginning of the GPGME plaintext data buffer */
415
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
416
perror_plus("gpgme_data_seek");
254
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
255
perror("pgpme_data_seek");
417
256
plaintext_length = -1;
418
257
goto decrypt_end;
419
258
}
420
259
421
260
*plaintext = NULL;
422
261
while(true){
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;
262
plaintext_capacity = adjustbuffer(plaintext,
263
(size_t)plaintext_length,
264
plaintext_capacity);
265
if (plaintext_capacity == 0){
266
perror("adjustbuffer");
267
plaintext_length = -1;
268
goto decrypt_end;
430
269
}
431
270
432
271
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
433
272
BUFFER_SIZE);
434
273
/* Print the data, if any */
435
if(ret == 0){
274
if (ret == 0){
436
275
/* EOF */
437
276
break;
438
277
}
439
278
if(ret < 0){
440
perror_plus("gpgme_data_read");
279
perror("gpgme_data_read");
441
280
plaintext_length = -1;
442
281
goto decrypt_end;
443
282
}
444
283
plaintext_length += ret;
445
284
}
446
285
447
286
if(debug){
448
fprintf_plus(stderr, "Decrypted password is: ");
287
fprintf(stderr, "Decrypted password is: ");
449
288
for(ssize_t i = 0; i < plaintext_length; i++){
450
289
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
451
290
}
462
301
return plaintext_length;
463
302
}
464
303
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)
304
static const char * safer_gnutls_strerror (int value) {
305
const char *ret = gnutls_strerror (value);
306
if (ret == NULL)
469
307
ret = "(unknown)";
470
308
return ret;
471
309
}
473
311
/* GnuTLS log function callback */
474
312
static void debuggnutls(__attribute__((unused)) int level,
475
313
const char* string){
476
fprintf_plus(stderr, "GnuTLS: %s", string);
314
fprintf(stderr, "GnuTLS: %s", string);
477
315
}
478
316
479
static int init_gnutls_global(const char *pubkeyfilename,
317
static int init_gnutls_global(mandos_context *mc,
318
const char *pubkeyfilename,
480
319
const char *seckeyfilename){
481
320
int ret;
482
321
483
322
if(debug){
484
fprintf_plus(stderr, "Initializing GnuTLS\n");
323
fprintf(stderr, "Initializing GnuTLS\n");
485
324
}
486
325
487
326
ret = gnutls_global_init();
488
if(ret != GNUTLS_E_SUCCESS){
489
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
490
safer_gnutls_strerror(ret));
327
if (ret != GNUTLS_E_SUCCESS) {
328
fprintf (stderr, "GnuTLS global_init: %s\n",
329
safer_gnutls_strerror(ret));
491
330
return -1;
492
331
}
493
332
494
if(debug){
333
if (debug){
495
334
/* "Use a log level over 10 to enable all debugging options."
496
335
* - GnuTLS manual
497
336
*/
500
339
}
501
340
502
341
/* OpenPGP credentials */
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();
342
gnutls_certificate_allocate_credentials(&mc->cred);
343
if (ret != GNUTLS_E_SUCCESS){
344
fprintf (stderr, "GnuTLS memory error: %s\n",
345
safer_gnutls_strerror(ret));
346
gnutls_global_deinit ();
508
347
return -1;
509
348
}
510
349
511
350
if(debug){
512
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
513
" secret key %s as GnuTLS credentials\n",
514
pubkeyfilename,
515
seckeyfilename);
351
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
352
" and keyfile %s as GnuTLS credentials\n", pubkeyfilename,
353
seckeyfilename);
516
354
}
517
355
518
356
ret = gnutls_certificate_set_openpgp_key_file
519
(mc.cred, pubkeyfilename, seckeyfilename,
357
(mc->cred, pubkeyfilename, seckeyfilename,
520
358
GNUTLS_OPENPGP_FMT_BASE64);
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));
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));
527
365
goto globalfail;
528
366
}
529
367
530
368
/* GnuTLS server initialization */
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));
536
goto globalfail;
537
}
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));
542
goto globalfail;
543
}
544
545
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
546
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
547
384
return 0;
548
385
549
386
globalfail:
550
551
gnutls_certificate_free_credentials(mc.cred);
387
388
gnutls_certificate_free_credentials(mc->cred);
552
389
gnutls_global_deinit();
553
gnutls_dh_params_deinit(mc.dh_params);
554
390
return -1;
391
555
392
}
556
393
557
static int init_gnutls_session(gnutls_session_t *session){
394
static int init_gnutls_session(mandos_context *mc,
395
gnutls_session_t *session){
558
396
int ret;
559
397
/* GnuTLS session creation */
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));
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));
570
402
}
571
403
572
404
{
573
405
const char *err;
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);
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);
586
412
return -1;
587
413
}
588
414
}
589
415
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);
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);
602
422
return -1;
603
423
}
604
424
605
425
/* ignore client certificate if any. */
606
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
426
gnutls_certificate_server_set_request (*session,
427
GNUTLS_CERT_IGNORE);
607
428
608
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
429
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
609
430
610
431
return 0;
611
432
}
617
438
/* Called when a Mandos server is found */
618
439
static int start_mandos_communication(const char *ip, uint16_t port,
619
440
AvahiIfIndex if_index,
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;
441
mandos_context *mc){
442
int ret, tcp_sd;
443
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
627
444
char *buffer = NULL;
628
char *decrypted_buffer = NULL;
445
char *decrypted_buffer;
629
446
size_t buffer_length = 0;
630
447
size_t buffer_capacity = 0;
448
ssize_t decrypted_buffer_size;
631
449
size_t written;
632
int retval = -1;
450
int retval = 0;
451
char interface[IF_NAMESIZE];
633
452
gnutls_session_t session;
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;
677
}
678
679
memset(&to, 0, sizeof(to));
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;
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);
476
}
477
478
memset(&to, 0, sizeof(to)); /* Spurious warning */
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;
692
486
}
693
487
if(ret == 0){
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
}
488
fprintf(stderr, "Bad address: %s\n", ip);
489
return -1;
490
}
491
to.in6.sin6_port = htons(port); /* Spurious warning */
721
492
722
if(quit_now){
723
errno = EINTR;
724
goto mandos_end;
725
}
493
to.in6.sin6_scope_id = (uint32_t)if_index;
726
494
727
495
if(debug){
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");
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");
752
502
} else {
753
503
if(strcmp(addrstr, ip) != 0){
754
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
504
fprintf(stderr, "Canonical address form: %s\n", addrstr);
755
505
}
756
506
}
757
507
}
758
508
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;
781
}
782
509
ret = connect(tcp_sd, &to.in, sizeof(to));
510
if (ret < 0){
511
perror("connect");
512
return -1;
513
}
514
783
515
const char *out = mandos_protocol_version;
784
516
written = 0;
785
while(true){
517
while (true){
786
518
size_t out_size = strlen(out);
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;
519
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
520
out_size - written));
521
if (ret == -1){
522
perror("write");
523
retval = -1;
793
524
goto mandos_end;
794
525
}
795
526
written += (size_t)ret;
796
527
if(written < out_size){
797
528
continue;
798
529
} else {
799
if(out == mandos_protocol_version){
530
if (out == mandos_protocol_version){
800
531
written = 0;
801
532
out = "\r\n";
802
533
} else {
803
534
break;
804
535
}
805
536
}
806
807
if(quit_now){
808
errno = EINTR;
809
goto mandos_end;
810
}
811
537
}
812
538
813
539
if(debug){
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
}
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);
836
547
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
837
548
838
if(ret != GNUTLS_E_SUCCESS){
549
if (ret != GNUTLS_E_SUCCESS){
839
550
if(debug){
840
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
841
gnutls_perror(ret);
551
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
552
gnutls_perror (ret);
842
553
}
843
errno = EPROTO;
554
retval = -1;
844
555
goto mandos_end;
845
556
}
846
557
847
558
/* Read OpenPGP packet that contains the wanted password */
848
559
849
560
if(debug){
850
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
851
" %s\n", ip);
561
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
562
ip);
852
563
}
853
564
854
565
while(true){
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){
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){
878
577
break;
879
578
}
880
if(sret < 0){
881
switch(sret){
579
if (ret < 0){
580
switch(ret){
882
581
case GNUTLS_E_INTERRUPTED:
883
582
case GNUTLS_E_AGAIN:
884
583
break;
885
584
case GNUTLS_E_REHANDSHAKE:
886
do {
887
ret = gnutls_handshake(session);
888
889
if(quit_now){
890
errno = EINTR;
891
goto mandos_end;
892
}
585
do{
586
ret = gnutls_handshake (session);
893
587
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
894
if(ret < 0){
895
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
896
"***\n");
897
gnutls_perror(ret);
898
errno = EPROTO;
588
if (ret < 0){
589
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
590
gnutls_perror (ret);
591
retval = -1;
899
592
goto mandos_end;
900
593
}
901
594
break;
902
595
default:
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;
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);
907
600
goto mandos_end;
908
601
}
909
602
} else {
910
buffer_length += (size_t) sret;
603
buffer_length += (size_t) ret;
911
604
}
912
605
}
913
606
914
607
if(debug){
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,
934
&decrypted_buffer);
935
if(decrypted_buffer_size >= 0){
936
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){
937
619
written = 0;
938
620
while(written < (size_t) decrypted_buffer_size){
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);
621
ret = (int)fwrite (decrypted_buffer + written, 1,
622
(size_t)decrypted_buffer_size - written,
623
stdout);
947
624
if(ret == 0 and ferror(stdout)){
948
int e = errno;
949
625
if(debug){
950
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
951
strerror(errno));
626
fprintf(stderr, "Error writing encrypted data: %s\n",
627
strerror(errno));
952
628
}
953
errno = e;
954
goto mandos_end;
629
retval = -1;
630
break;
955
631
}
956
632
written += (size_t)ret;
957
633
}
958
retval = 0;
634
free(decrypted_buffer);
635
} else {
636
retval = -1;
959
637
}
960
638
}
961
639
962
640
/* Shutdown procedure */
963
641
964
642
mandos_end:
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
}
984
}
643
free(buffer);
644
close(tcp_sd);
645
gnutls_deinit (session);
985
646
return retval;
986
647
}
987
648
988
649
static void resolve_callback(AvahiSServiceResolver *r,
989
650
AvahiIfIndex interface,
990
AvahiProtocol proto,
651
AVAHI_GCC_UNUSED AvahiProtocol protocol,
991
652
AvahiResolverEvent event,
992
653
const char *name,
993
654
const char *type,
998
659
AVAHI_GCC_UNUSED AvahiStringList *txt,
999
660
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1000
661
flags,
1001
AVAHI_GCC_UNUSED void* userdata){
1002
assert(r);
662
void* userdata) {
663
mandos_context *mc = userdata;
664
assert(r); /* Spurious warning */
1003
665
1004
666
/* Called whenever a service has been resolved successfully or
1005
667
timed out */
1006
668
1007
if(quit_now){
1008
return;
1009
}
1010
1011
switch(event){
669
switch (event) {
1012
670
default:
1013
671
case AVAHI_RESOLVER_FAILURE:
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)));
672
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
673
" of type '%s' in domain '%s': %s\n", name, type, domain,
674
avahi_strerror(avahi_server_errno(mc->server)));
1018
675
break;
1019
676
1020
677
case AVAHI_RESOLVER_FOUND:
1022
679
char ip[AVAHI_ADDRESS_STR_MAX];
1023
680
avahi_address_snprint(ip, sizeof(ip), address);
1024
681
if(debug){
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);
682
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
683
PRIu16 ") on port %d\n", name, host_name, ip,
684
interface, port);
1028
685
}
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
}
686
int ret = start_mandos_communication(ip, port, interface, mc);
687
if (ret == 0){
688
avahi_simple_poll_quit(mc->simple_poll);
1039
689
}
1040
690
}
1041
691
}
1042
692
avahi_s_service_resolver_free(r);
1043
693
}
1044
694
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){
1055
assert(b);
695
static void browse_callback( AvahiSServiceBrowser *b,
696
AvahiIfIndex interface,
697
AvahiProtocol protocol,
698
AvahiBrowserEvent event,
699
const char *name,
700
const char *type,
701
const char *domain,
702
AVAHI_GCC_UNUSED AvahiLookupResultFlags
703
flags,
704
void* userdata) {
705
mandos_context *mc = userdata;
706
assert(b); /* Spurious warning */
1056
707
1057
708
/* Called whenever a new services becomes available on the LAN or
1058
709
is removed from the LAN */
1059
710
1060
if(quit_now){
1061
return;
1062
}
1063
1064
switch(event){
711
switch (event) {
1065
712
default:
1066
713
case AVAHI_BROWSER_FAILURE:
1067
714
1068
fprintf_plus(stderr, "(Avahi browser) %s\n",
1069
avahi_strerror(avahi_server_errno(mc.server)));
1070
avahi_simple_poll_quit(mc.simple_poll);
715
fprintf(stderr, "(Avahi browser) %s\n",
716
avahi_strerror(avahi_server_errno(mc->server)));
717
avahi_simple_poll_quit(mc->simple_poll);
1071
718
return;
1072
719
1073
720
case AVAHI_BROWSER_NEW:
1076
723
the callback function is called the Avahi server will free the
1077
724
resolver for us. */
1078
725
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)));
726
if (!(avahi_s_service_resolver_new(mc->server, interface,
727
protocol, name, type, domain,
728
AVAHI_PROTO_INET6, 0,
729
resolve_callback, mc)))
730
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
731
name, avahi_strerror(avahi_server_errno(mc->server)));
1085
732
break;
1086
733
1087
734
case AVAHI_BROWSER_REMOVE:
1090
737
case AVAHI_BROWSER_ALL_FOR_NOW:
1091
738
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1092
739
if(debug){
1093
fprintf_plus(stderr, "No Mandos server found, still"
1094
" searching...\n");
740
fprintf(stderr, "No Mandos server found, still searching...\n");
1095
741
}
1096
742
break;
1097
743
}
1098
744
}
1099
745
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);
746
/* Combines file name and path and returns the malloced new
747
string. some sane checks could/should be added */
748
static char *combinepath(const char *first, const char *second){
749
char *tmp;
750
int ret = asprintf(&tmp, "%s/%s", first, second);
1281
751
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
}
752
return NULL;
753
}
754
return tmp;
755
}
756
1516
757
1517
758
int main(int argc, char *argv[]){
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");
759
AvahiSServiceBrowser *sb = NULL;
760
int error;
761
int ret;
762
int exitcode = EXIT_SUCCESS;
763
const char *interface = "eth0";
764
struct ifreq network;
765
int sd;
766
uid_t uid;
767
gid_t gid;
768
char *connect_to = NULL;
769
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
770
char *pubkeyfilename = NULL;
771
char *seckeyfilename = NULL;
772
const char *pubkeyname = "pubkey.txt";
773
const char *seckeyname = "seckey.txt";
774
mandos_context mc = { .simple_poll = NULL, .server = NULL,
775
.dh_bits = 1024, .priority = "SECURE256"};
776
bool gnutls_initalized = false;
777
778
{
779
struct argp_option options[] = {
780
{ .name = "debug", .key = 128,
781
.doc = "Debug mode", .group = 3 },
782
{ .name = "connect", .key = 'c',
783
.arg = "IP",
784
.doc = "Connect directly to a sepcified mandos server",
785
.group = 1 },
786
{ .name = "interface", .key = 'i',
787
.arg = "INTERFACE",
788
.doc = "Interface that Avahi will conntect through",
789
.group = 1 },
790
{ .name = "keydir", .key = 'd',
791
.arg = "KEYDIR",
792
.doc = "Directory where the openpgp keyring is",
793
.group = 1 },
794
{ .name = "seckey", .key = 's',
795
.arg = "SECKEY",
796
.doc = "Secret openpgp key for gnutls authentication",
797
.group = 1 },
798
{ .name = "pubkey", .key = 'p',
799
.arg = "PUBKEY",
800
.doc = "Public openpgp key for gnutls authentication",
801
.group = 2 },
802
{ .name = "dh-bits", .key = 129,
803
.arg = "BITS",
804
.doc = "dh-bits to use in gnutls communication",
805
.group = 2 },
806
{ .name = "priority", .key = 130,
807
.arg = "PRIORITY",
808
.doc = "GNUTLS priority", .group = 1 },
809
{ .name = NULL }
810
};
811
812
813
error_t parse_opt (int key, char *arg,
814
struct argp_state *state) {
815
/* Get the INPUT argument from `argp_parse', which we know is
816
a pointer to our plugin list pointer. */
817
switch (key) {
818
case 128:
819
debug = true;
820
break;
821
case 'c':
822
connect_to = arg;
823
break;
824
case 'i':
825
interface = arg;
826
break;
827
case 'd':
828
keydir = arg;
829
break;
830
case 's':
831
seckeyname = arg;
832
break;
833
case 'p':
834
pubkeyname = arg;
835
break;
836
case 129:
837
errno = 0;
838
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
839
if (errno){
840
perror("strtol");
841
exit(EXIT_FAILURE);
842
}
843
break;
844
case 130:
845
mc.priority = arg;
846
break;
847
case ARGP_KEY_ARG:
848
argp_usage (state);
849
case ARGP_KEY_END:
850
break;
851
default:
852
return ARGP_ERR_UNKNOWN;
853
}
854
return 0;
855
}
856
857
struct argp argp = { .options = options, .parser = parse_opt,
858
.args_doc = "",
859
.doc = "Mandos client -- Get and decrypt"
860
" passwords from mandos server" };
861
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
862
if (ret == ARGP_ERR_UNKNOWN){
863
fprintf(stderr, "Unknown error while parsing arguments\n");
864
exitcode = EXIT_FAILURE;
865
goto end;
866
}
867
}
868
869
pubkeyfilename = combinepath(keydir, pubkeyname);
870
if (pubkeyfilename == NULL){
871
perror("combinepath");
872
exitcode = EXIT_FAILURE;
873
goto end;
874
}
875
876
seckeyfilename = combinepath(keydir, seckeyname);
877
if (seckeyfilename == NULL){
878
perror("combinepath");
879
exitcode = EXIT_FAILURE;
880
goto end;
881
}
882
883
ret = init_gnutls_global(&mc, pubkeyfilename, seckeyfilename);
884
if (ret == -1){
885
fprintf(stderr, "init_gnutls_global failed\n");
886
exitcode = EXIT_FAILURE;
887
goto end;
1719
888
} 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);
889
gnutls_initalized = true;
890
}
891
892
/* If the interface is down, bring it up */
893
{
894
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
895
if(sd < 0) {
896
perror("socket");
897
exitcode = EXIT_FAILURE;
898
goto end;
899
}
900
strcpy(network.ifr_name, interface); /* Spurious warning */
901
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1767
902
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);
903
perror("ioctl SIOCGIFFLAGS");
1802
904
exitcode = EXIT_FAILURE;
1803
905
goto end;
1804
906
}
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){
907
if((network.ifr_flags & IFF_UP) == 0){
908
network.ifr_flags |= IFF_UP;
909
ret = ioctl(sd, SIOCSIFFLAGS, &network);
910
if(ret == -1){
911
perror("ioctl SIOCSIFFLAGS");
912
exitcode = EXIT_FAILURE;
913
goto end;
914
}
915
}
916
close(sd);
917
}
918
919
uid = getuid();
920
gid = getgid();
921
922
ret = setuid(uid);
923
if (ret == -1){
924
perror("setuid");
925
}
926
927
setgid(gid);
928
if (ret == -1){
929
perror("setgid");
930
}
931
1891
932
if_index = (AvahiIfIndex) if_nametoindex(interface);
1892
933
if(if_index == 0){
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
934
fprintf(stderr, "No such interface: \"%s\"\n", interface);
935
exit(EXIT_FAILURE);
936
}
937
938
if(connect_to != NULL){
939
/* Connect directly, do not use Zeroconf */
940
/* (Mainly meant for debugging) */
941
char *address = strrchr(connect_to, ':');
942
if(address == NULL){
943
fprintf(stderr, "No colon in address\n");
944
exitcode = EXIT_FAILURE;
945
goto end;
946
}
947
errno = 0;
948
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
949
if(errno){
950
perror("Bad port number");
951
exitcode = EXIT_FAILURE;
952
goto end;
953
}
954
*address = '\0';
955
address = connect_to;
956
ret = start_mandos_communication(address, port, if_index, &mc);
957
if(ret < 0){
958
exitcode = EXIT_FAILURE;
959
} else {
960
exitcode = EXIT_SUCCESS;
961
}
962
goto end;
963
}
964
965
if (not debug){
966
avahi_set_log_function(empty_log);
967
}
968
969
/* Initialize the pseudo-RNG for Avahi */
970
srand((unsigned int) time(NULL));
971
972
/* Allocate main Avahi loop object */
973
mc.simple_poll = avahi_simple_poll_new();
974
if (mc.simple_poll == NULL) {
975
fprintf(stderr, "Avahi: Failed to create simple poll"
976
" object.\n");
977
exitcode = EXIT_FAILURE;
978
goto end;
979
}
980
981
{
982
AvahiServerConfig config;
983
/* Do not publish any local Zeroconf records */
984
avahi_server_config_init(&config);
985
config.publish_hinfo = 0;
986
config.publish_addresses = 0;
987
config.publish_workstation = 0;
988
config.publish_domain = 0;
989
990
/* Allocate a new server */
991
mc.server = avahi_server_new(avahi_simple_poll_get
992
(mc.simple_poll), &config, NULL,
993
NULL, &error);
994
995
/* Free the Avahi configuration data */
996
avahi_server_config_free(&config);
997
}
998
999
/* Check if creating the Avahi server object succeeded */
1000
if (mc.server == NULL) {
1001
fprintf(stderr, "Failed to create Avahi server: %s\n",
1002
avahi_strerror(error));
1003
exitcode = EXIT_FAILURE;
1004
goto end;
1005
}
1006
1007
/* Create the Avahi service browser */
1008
sb = avahi_s_service_browser_new(mc.server, if_index,
1009
AVAHI_PROTO_INET6,
1010
"_mandos._tcp", NULL, 0,
1011
browse_callback, &mc);
1012
if (sb == NULL) {
1013
fprintf(stderr, "Failed to create service browser: %s\n",
1014
avahi_strerror(avahi_server_errno(mc.server)));
1015
exitcode = EXIT_FAILURE;
1016
goto end;
1017
}
1018
1019
/* Run the main loop */
1020
1021
if (debug){
1022
fprintf(stderr, "Starting Avahi loop search\n");
1023
}
1024
1025
avahi_simple_poll_loop(mc.simple_poll);
1026
2195
1027
end:
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;
1028
1029
if (debug){
1030
fprintf(stderr, "%s exiting\n", argv[0]);
1031
}
1032
1033
/* Cleanup things */
1034
if (sb != NULL)
1035
avahi_s_service_browser_free(sb);
1036
1037
if (mc.server != NULL)
1038
avahi_server_free(mc.server);
1039
1040
if (mc.simple_poll != NULL)
1041
avahi_simple_poll_free(mc.simple_poll);
1042
free(pubkeyfilename);
1043
free(seckeyfilename);
1044
1045
if (gnutls_initalized){
1046
gnutls_certificate_free_credentials(mc.cred);
1047
gnutls_global_deinit ();
1048
}
1049
1050
return exitcode;
2324
1051
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0