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- Committer: Teddy Hogeborn
- Date: 2008-08-02 21:06:12 UTC
- Revision ID: teddy@fukt.bsnet.se-20080802210612-4c1waup4z0f66ya7
Non-tested commit for merge purposes.
* plugbasedclient.c (getplugin, addargument, set_cloexec): Made static.
* plugins.d/passprompt.c (termination_handler): Made static.
* plugbasedclient.c (getplugin, addargument, set_cloexec): Made static.
* plugins.d/passprompt.c (termination_handler): Made static.
- files added:
- ca.pem
- files removed:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- files renamed:
- plugin-runner.c => plugbasedclient.c
- plugins.d/mandos-client.c => plugins.d/mandosclient.c
- plugins.d/password-prompt.c => plugins.d/passprompt.c
- mandos.conf => server.conf
- mandos => server.py
- files modified:
- Makefile
added
removed
plugins.d/mandosclient.c
1
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
* Mandos-client - get and decrypt data from a Mandos server
3
* Mandos client - get and decrypt data from a Mandos server
4
4
*
5
5
* This program is partly derived from an example program for an Avahi
6
6
* service browser, downloaded from
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
12
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
14
13
*
15
14
* This program is free software: you can redistribute it and/or
16
15
* modify it under the terms of the GNU General Public License as
26
25
* along with this program. If not, see
27
26
* <http://www.gnu.org/licenses/>.
28
27
*
29
* Contact the authors at <mandos@recompile.se>.
28
* Contact the authors at <mandos@fukt.bsnet.se>.
30
29
*/
31
30
32
31
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
34
32
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
37
33
#define _FILE_OFFSET_BITS 64
38
#endif
39
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
45
#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 */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
57
#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() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
SIOCSIFFLAGS, if_indextoname(),
70
if_nametoindex(), IF_NAMESIZE */
71
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
*/
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
78
#include <iso646.h> /* not, or, and */
79
#include <argp.h> /* struct argp_option, error_t, struct
80
argp_state, struct argp,
81
argp_parse(), ARGP_KEY_ARG,
82
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
83
#include <signal.h> /* sigemptyset(), sigaddset(),
84
sigaction(), SIGTERM, sig_atomic_t,
85
raise() */
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
WEXITSTATUS(), WTERMSIG() */
90
91
#ifdef __linux__
92
#include <sys/klog.h> /* klogctl() */
93
#endif /* __linux__ */
94
95
/* Avahi */
96
/* All Avahi types, constants and functions
97
Avahi*, avahi_*,
98
AVAHI_* */
34
35
#include <stdio.h>
36
#include <assert.h>
37
#include <stdlib.h>
38
#include <time.h>
39
#include <net/if.h> /* if_nametoindex */
40
99
41
#include <avahi-core/core.h>
100
42
#include <avahi-core/lookup.h>
101
43
#include <avahi-core/log.h>
103
45
#include <avahi-common/malloc.h>
104
46
#include <avahi-common/error.h>
105
47
106
/* GnuTLS */
107
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
108
functions:
109
gnutls_*
110
init_gnutls_session(),
111
GNUTLS_* */
112
#include <gnutls/openpgp.h>
113
/* gnutls_certificate_set_openpgp_key_file(),
114
GNUTLS_OPENPGP_FMT_BASE64 */
115
116
/* GPGME */
117
#include <gpgme.h> /* All GPGME types, constants and
118
functions:
119
gpgme_*
120
GPGME_PROTOCOL_OpenPGP,
121
GPG_ERR_NO_* */
48
//mandos client part
49
#include <sys/types.h> /* socket(), inet_pton() */
50
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
51
struct in6_addr, inet_pton() */
52
#include <gnutls/gnutls.h> /* All GnuTLS stuff */
53
#include <gnutls/openpgp.h> /* GnuTLS with openpgp stuff */
54
55
#include <unistd.h> /* close() */
56
#include <netinet/in.h>
57
#include <stdbool.h> /* true */
58
#include <string.h> /* memset */
59
#include <arpa/inet.h> /* inet_pton() */
60
#include <iso646.h> /* not */
61
62
// gpgme
63
#include <errno.h> /* perror() */
64
#include <gpgme.h>
65
66
// getopt_long
67
#include <getopt.h>
122
68
123
69
#define BUFFER_SIZE 256
124
70
125
#define PATHDIR "/conf/conf.d/mandos"
126
#define SECKEY "seckey.txt"
127
#define PUBKEY "pubkey.txt"
128
#define HOOKDIR "/lib/mandos/network-hooks.d"
71
static int dh_bits = 1024;
72
73
static const char *keydir = "/conf/conf.d/mandos";
74
static const char *pubkeyfile = "pubkey.txt";
75
static const char *seckeyfile = "seckey.txt";
129
76
130
77
bool debug = false;
131
static const char mandos_protocol_version[] = "1";
132
const char *argp_program_version = "mandos-client " VERSION;
133
const char *argp_program_bug_address = "<mandos@recompile.se>";
134
static const char sys_class_net[] = "/sys/class/net";
135
char *connect_to = NULL;
136
const char *hookdir = HOOKDIR;
137
138
/* Doubly linked list that need to be circularly linked when used */
139
typedef struct server{
140
const char *ip;
141
uint16_t port;
142
AvahiIfIndex if_index;
143
int af;
144
struct timespec last_seen;
145
struct server *next;
146
struct server *prev;
147
} server;
148
149
/* Used for passing in values through the Avahi callback functions */
78
79
/* Used for */
150
80
typedef struct {
151
AvahiSimplePoll *simple_poll;
152
AvahiServer *server;
81
gnutls_session_t session;
153
82
gnutls_certificate_credentials_t cred;
154
unsigned int dh_bits;
155
83
gnutls_dh_params_t dh_params;
156
const char *priority;
84
} encrypted_session;
85
86
87
static ssize_t pgp_packet_decrypt (char *packet, size_t packet_size,
88
char **new_packet,
89
const char *homedir){
90
gpgme_data_t dh_crypto, dh_plain;
157
91
gpgme_ctx_t ctx;
158
server *current_server;
159
} mandos_context;
160
161
/* global context so signal handler can reach it*/
162
mandos_context mc = { .simple_poll = NULL, .server = NULL,
163
.dh_bits = 1024, .priority = "SECURE256"
164
":!CTYPE-X.509:+CTYPE-OPENPGP",
165
.current_server = NULL };
166
167
sig_atomic_t quit_now = 0;
168
int signal_received = 0;
169
170
/* Function to use when printing errors */
171
void perror_plus(const char *print_text){
172
fprintf(stderr, "Mandos plugin %s: ",
173
program_invocation_short_name);
174
perror(print_text);
175
}
176
177
int fprintf_plus(FILE *stream, const char *format, ...){
178
va_list ap;
179
va_start (ap, format);
180
181
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ", program_invocation_short_name));
182
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
183
}
184
185
/*
186
* Make additional room in "buffer" for at least BUFFER_SIZE more
187
* bytes. "buffer_capacity" is how much is currently allocated,
188
* "buffer_length" is how much is already used.
189
*/
190
size_t incbuffer(char **buffer, size_t buffer_length,
191
size_t buffer_capacity){
192
if(buffer_length + BUFFER_SIZE > buffer_capacity){
193
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
194
if(buffer == NULL){
195
return 0;
196
}
197
buffer_capacity += BUFFER_SIZE;
198
}
199
return buffer_capacity;
200
}
201
202
/* Add server to set of servers to retry periodically */
203
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
204
int af){
205
int ret;
206
server *new_server = malloc(sizeof(server));
207
if(new_server == NULL){
208
perror_plus("malloc");
209
return -1;
210
}
211
*new_server = (server){ .ip = strdup(ip),
212
.port = port,
213
.if_index = if_index,
214
.af = af };
215
if(new_server->ip == NULL){
216
perror_plus("strdup");
217
return -1;
218
}
219
/* Special case of first server */
220
if (mc.current_server == NULL){
221
new_server->next = new_server;
222
new_server->prev = new_server;
223
mc.current_server = new_server;
224
/* Place the new server last in the list */
225
} else {
226
new_server->next = mc.current_server;
227
new_server->prev = mc.current_server->prev;
228
new_server->prev->next = new_server;
229
mc.current_server->prev = new_server;
230
}
231
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
232
if(ret == -1){
233
perror_plus("clock_gettime");
234
return -1;
235
}
236
return 0;
237
}
238
239
/*
240
* Initialize GPGME.
241
*/
242
static bool init_gpgme(const char *seckey, const char *pubkey,
243
const char *tempdir){
244
92
gpgme_error_t rc;
93
ssize_t ret;
94
ssize_t new_packet_capacity = 0;
95
ssize_t new_packet_length = 0;
245
96
gpgme_engine_info_t engine_info;
246
247
248
/*
249
* Helper function to insert pub and seckey to the engine keyring.
250
*/
251
bool import_key(const char *filename){
252
int ret;
253
int fd;
254
gpgme_data_t pgp_data;
255
256
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
257
if(fd == -1){
258
perror_plus("open");
259
return false;
260
}
261
262
rc = gpgme_data_new_from_fd(&pgp_data, fd);
263
if(rc != GPG_ERR_NO_ERROR){
264
fprintf(stderr, "Mandos plugin mandos-client: "
265
"bad gpgme_data_new_from_fd: %s: %s\n",
266
gpgme_strsource(rc), gpgme_strerror(rc));
267
return false;
268
}
269
270
rc = gpgme_op_import(mc.ctx, pgp_data);
271
if(rc != GPG_ERR_NO_ERROR){
272
fprintf(stderr, "Mandos plugin mandos-client: "
273
"bad gpgme_op_import: %s: %s\n",
274
gpgme_strsource(rc), gpgme_strerror(rc));
275
return false;
276
}
277
278
ret = (int)TEMP_FAILURE_RETRY(close(fd));
279
if(ret == -1){
280
perror_plus("close");
281
}
282
gpgme_data_release(pgp_data);
283
return true;
284
}
285
286
if(debug){
287
fprintf(stderr, "Mandos plugin mandos-client: "
288
"Initializing GPGME\n");
97
98
if (debug){
99
fprintf(stderr, "Trying to decrypt OpenPGP packet\n");
289
100
}
290
101
291
102
/* Init GPGME */
292
103
gpgme_check_version(NULL);
293
104
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
294
if(rc != GPG_ERR_NO_ERROR){
295
fprintf(stderr, "Mandos plugin mandos-client: "
296
"bad gpgme_engine_check_version: %s: %s\n",
105
if (rc != GPG_ERR_NO_ERROR){
106
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
297
107
gpgme_strsource(rc), gpgme_strerror(rc));
298
return false;
108
return -1;
299
109
}
300
110
301
/* Set GPGME home directory for the OpenPGP engine only */
302
rc = gpgme_get_engine_info(&engine_info);
303
if(rc != GPG_ERR_NO_ERROR){
304
fprintf(stderr, "Mandos plugin mandos-client: "
305
"bad gpgme_get_engine_info: %s: %s\n",
111
/* Set GPGME home directory */
112
rc = gpgme_get_engine_info (&engine_info);
113
if (rc != GPG_ERR_NO_ERROR){
114
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
306
115
gpgme_strsource(rc), gpgme_strerror(rc));
307
return false;
116
return -1;
308
117
}
309
118
while(engine_info != NULL){
310
119
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
311
120
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
312
engine_info->file_name, tempdir);
121
engine_info->file_name, homedir);
313
122
break;
314
123
}
315
124
engine_info = engine_info->next;
316
125
}
317
126
if(engine_info == NULL){
318
fprintf(stderr, "Mandos plugin mandos-client: "
319
"Could not set GPGME home dir to %s\n", 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(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(stderr, "Mandos plugin mandos-client: "
354
"Trying to decrypt OpenPGP data\n");
355
}
356
357
/* Create new GPGME data buffer from memory cryptotext */
358
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
359
0);
360
if(rc != GPG_ERR_NO_ERROR){
361
fprintf(stderr, "Mandos plugin mandos-client: "
362
"bad gpgme_data_new_from_mem: %s: %s\n",
127
fprintf(stderr, "Could not set home dir to %s\n", homedir);
128
return -1;
129
}
130
131
/* Create new GPGME data buffer from packet buffer */
132
rc = gpgme_data_new_from_mem(&dh_crypto, packet, packet_size, 0);
133
if (rc != GPG_ERR_NO_ERROR){
134
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
363
135
gpgme_strsource(rc), gpgme_strerror(rc));
364
136
return -1;
365
137
}
366
138
367
139
/* Create new empty GPGME data buffer for the plaintext */
368
140
rc = gpgme_data_new(&dh_plain);
369
if(rc != GPG_ERR_NO_ERROR){
370
fprintf(stderr, "Mandos plugin mandos-client: "
371
"bad gpgme_data_new: %s: %s\n",
372
gpgme_strsource(rc), gpgme_strerror(rc));
373
gpgme_data_release(dh_crypto);
374
return -1;
375
}
376
377
/* Decrypt data from the cryptotext data buffer to the plaintext
378
data buffer */
379
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
380
if(rc != GPG_ERR_NO_ERROR){
381
fprintf(stderr, "Mandos plugin mandos-client: "
382
"bad gpgme_op_decrypt: %s: %s\n",
383
gpgme_strsource(rc), gpgme_strerror(rc));
384
plaintext_length = -1;
385
if(debug){
386
gpgme_decrypt_result_t result;
387
result = gpgme_op_decrypt_result(mc.ctx);
388
if(result == NULL){
389
fprintf(stderr, "Mandos plugin mandos-client: "
390
"gpgme_op_decrypt_result failed\n");
391
} else {
392
fprintf(stderr, "Mandos plugin mandos-client: "
393
"Unsupported algorithm: %s\n",
394
result->unsupported_algorithm);
395
fprintf(stderr, "Mandos plugin mandos-client: "
396
"Wrong key usage: %u\n",
397
result->wrong_key_usage);
398
if(result->file_name != NULL){
399
fprintf(stderr, "Mandos plugin mandos-client: "
400
"File name: %s\n", result->file_name);
401
}
402
gpgme_recipient_t recipient;
403
recipient = result->recipients;
141
if (rc != GPG_ERR_NO_ERROR){
142
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
143
gpgme_strsource(rc), gpgme_strerror(rc));
144
return -1;
145
}
146
147
/* Create new GPGME "context" */
148
rc = gpgme_new(&ctx);
149
if (rc != GPG_ERR_NO_ERROR){
150
fprintf(stderr, "bad gpgme_new: %s: %s\n",
151
gpgme_strsource(rc), gpgme_strerror(rc));
152
return -1;
153
}
154
155
/* Decrypt data from the FILE pointer to the plaintext data
156
buffer */
157
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
158
if (rc != GPG_ERR_NO_ERROR){
159
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
160
gpgme_strsource(rc), gpgme_strerror(rc));
161
return -1;
162
}
163
164
if(debug){
165
fprintf(stderr, "Decryption of OpenPGP packet succeeded\n");
166
}
167
168
if (debug){
169
gpgme_decrypt_result_t result;
170
result = gpgme_op_decrypt_result(ctx);
171
if (result == NULL){
172
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
173
} else {
174
fprintf(stderr, "Unsupported algorithm: %s\n",
175
result->unsupported_algorithm);
176
fprintf(stderr, "Wrong key usage: %d\n",
177
result->wrong_key_usage);
178
if(result->file_name != NULL){
179
fprintf(stderr, "File name: %s\n", result->file_name);
180
}
181
gpgme_recipient_t recipient;
182
recipient = result->recipients;
183
if(recipient){
404
184
while(recipient != NULL){
405
fprintf(stderr, "Mandos plugin mandos-client: "
406
"Public key algorithm: %s\n",
185
fprintf(stderr, "Public key algorithm: %s\n",
407
186
gpgme_pubkey_algo_name(recipient->pubkey_algo));
408
fprintf(stderr, "Mandos plugin mandos-client: "
409
"Key ID: %s\n", recipient->keyid);
410
fprintf(stderr, "Mandos plugin mandos-client: "
411
"Secret key available: %s\n",
187
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
188
fprintf(stderr, "Secret key available: %s\n",
412
189
recipient->status == GPG_ERR_NO_SECKEY
413
190
? "No" : "Yes");
414
191
recipient = recipient->next;
415
192
}
416
193
}
417
194
}
418
goto decrypt_end;
419
195
}
420
196
421
if(debug){
422
fprintf(stderr, "Mandos plugin mandos-client: "
423
"Decryption of OpenPGP data succeeded\n");
424
}
197
/* Delete the GPGME FILE pointer cryptotext data buffer */
198
gpgme_data_release(dh_crypto);
425
199
426
200
/* Seek back to the beginning of the GPGME plaintext data buffer */
427
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
428
perror_plus("gpgme_data_seek");
429
plaintext_length = -1;
430
goto decrypt_end;
201
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
202
perror("pgpme_data_seek");
431
203
}
432
204
433
*plaintext = NULL;
205
*new_packet = 0;
434
206
while(true){
435
plaintext_capacity = incbuffer(plaintext,
436
(size_t)plaintext_length,
437
plaintext_capacity);
438
if(plaintext_capacity == 0){
439
perror_plus("incbuffer");
440
plaintext_length = -1;
441
goto decrypt_end;
207
if (new_packet_length + BUFFER_SIZE > new_packet_capacity){
208
*new_packet = realloc(*new_packet,
209
(unsigned int)new_packet_capacity
210
+ BUFFER_SIZE);
211
if (*new_packet == NULL){
212
perror("realloc");
213
return -1;
214
}
215
new_packet_capacity += BUFFER_SIZE;
442
216
}
443
217
444
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
218
ret = gpgme_data_read(dh_plain, *new_packet + new_packet_length,
445
219
BUFFER_SIZE);
446
220
/* Print the data, if any */
447
if(ret == 0){
448
/* EOF */
221
if (ret == 0){
449
222
break;
450
223
}
451
224
if(ret < 0){
452
perror_plus("gpgme_data_read");
453
plaintext_length = -1;
454
goto decrypt_end;
455
}
456
plaintext_length += ret;
457
}
458
459
if(debug){
460
fprintf(stderr, "Mandos plugin mandos-client: "
461
"Decrypted password is: ");
462
for(ssize_t i = 0; i < plaintext_length; i++){
463
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
464
}
465
fprintf(stderr, "\n");
466
}
467
468
decrypt_end:
469
470
/* Delete the GPGME cryptotext data buffer */
471
gpgme_data_release(dh_crypto);
225
perror("gpgme_data_read");
226
return -1;
227
}
228
new_packet_length += ret;
229
}
230
231
/* FIXME: check characters before printing to screen so to not print
232
terminal control characters */
233
/* if(debug){ */
234
/* fprintf(stderr, "decrypted password is: "); */
235
/* fwrite(*new_packet, 1, new_packet_length, stderr); */
236
/* fprintf(stderr, "\n"); */
237
/* } */
472
238
473
239
/* Delete the GPGME plaintext data buffer */
474
240
gpgme_data_release(dh_plain);
475
return plaintext_length;
241
return new_packet_length;
476
242
}
477
243
478
static const char * safer_gnutls_strerror(int value){
479
const char *ret = gnutls_strerror(value); /* Spurious warning from
480
-Wunreachable-code */
481
if(ret == NULL)
244
static const char * safer_gnutls_strerror (int value) {
245
const char *ret = gnutls_strerror (value);
246
if (ret == NULL)
482
247
ret = "(unknown)";
483
248
return ret;
484
249
}
485
250
486
/* GnuTLS log function callback */
487
251
static void debuggnutls(__attribute__((unused)) int level,
488
252
const char* string){
489
fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);
253
fprintf(stderr, "%s", string);
490
254
}
491
255
492
static int init_gnutls_global(const char *pubkeyfilename,
493
const char *seckeyfilename){
256
static int initgnutls(encrypted_session *es){
257
const char *err;
494
258
int ret;
495
259
496
260
if(debug){
497
fprintf(stderr, "Mandos plugin mandos-client: "
498
"Initializing GnuTLS\n");
261
fprintf(stderr, "Initializing GnuTLS\n");
499
262
}
500
501
ret = gnutls_global_init();
502
if(ret != GNUTLS_E_SUCCESS){
503
fprintf(stderr, "Mandos plugin mandos-client: "
504
"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
263
264
if ((ret = gnutls_global_init ())
265
!= GNUTLS_E_SUCCESS) {
266
fprintf (stderr, "global_init: %s\n", safer_gnutls_strerror(ret));
505
267
return -1;
506
268
}
507
508
if(debug){
509
/* "Use a log level over 10 to enable all debugging options."
510
* - GnuTLS manual
511
*/
269
270
if (debug){
512
271
gnutls_global_set_log_level(11);
513
272
gnutls_global_set_log_function(debuggnutls);
514
273
}
515
274
516
/* OpenPGP credentials */
517
ret = gnutls_certificate_allocate_credentials(&mc.cred);
518
if(ret != GNUTLS_E_SUCCESS){
519
fprintf(stderr, "Mandos plugin mandos-client: "
520
"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
521
gnutls_global_deinit();
275
/* openpgp credentials */
276
if ((ret = gnutls_certificate_allocate_credentials (&es->cred))
277
!= GNUTLS_E_SUCCESS) {
278
fprintf (stderr, "memory error: %s\n",
279
safer_gnutls_strerror(ret));
522
280
return -1;
523
281
}
524
282
525
283
if(debug){
526
fprintf(stderr, "Mandos plugin mandos-client: "
527
"Attempting to use OpenPGP public key %s and"
528
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
529
seckeyfilename);
284
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
285
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
286
seckeyfile);
530
287
}
531
288
532
289
ret = gnutls_certificate_set_openpgp_key_file
533
(mc.cred, pubkeyfilename, seckeyfilename,
534
GNUTLS_OPENPGP_FMT_BASE64);
535
if(ret != GNUTLS_E_SUCCESS){
536
fprintf(stderr,
537
"Mandos plugin mandos-client: "
538
"Error[%d] while reading the OpenPGP key pair ('%s',"
539
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
540
fprintf(stderr, "Mandos plugin mandos-client: "
541
"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));
542
goto globalfail;
543
}
544
545
/* GnuTLS server initialization */
546
ret = gnutls_dh_params_init(&mc.dh_params);
547
if(ret != GNUTLS_E_SUCCESS){
548
fprintf(stderr, "Mandos plugin mandos-client: "
549
"Error in GnuTLS DH parameter initialization:"
550
" %s\n", safer_gnutls_strerror(ret));
551
goto globalfail;
552
}
553
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
554
if(ret != GNUTLS_E_SUCCESS){
555
fprintf(stderr, "Mandos plugin mandos-client: "
556
"Error in GnuTLS prime generation: %s\n",
557
safer_gnutls_strerror(ret));
558
goto globalfail;
559
}
560
561
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
562
563
return 0;
564
565
globalfail:
566
567
gnutls_certificate_free_credentials(mc.cred);
568
gnutls_global_deinit();
569
gnutls_dh_params_deinit(mc.dh_params);
570
return -1;
571
}
572
573
static int init_gnutls_session(gnutls_session_t *session){
574
int ret;
575
/* GnuTLS session creation */
576
do {
577
ret = gnutls_init(session, GNUTLS_SERVER);
578
if(quit_now){
579
return -1;
580
}
581
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
582
if(ret != GNUTLS_E_SUCCESS){
583
fprintf(stderr, "Mandos plugin mandos-client: "
584
"Error in GnuTLS session initialization: %s\n",
585
safer_gnutls_strerror(ret));
586
}
587
588
{
589
const char *err;
590
do {
591
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
592
if(quit_now){
593
gnutls_deinit(*session);
594
return -1;
595
}
596
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
597
if(ret != GNUTLS_E_SUCCESS){
598
fprintf(stderr, "Mandos plugin mandos-client: "
599
"Syntax error at: %s\n", err);
600
fprintf(stderr, "Mandos plugin mandos-client: "
601
"GnuTLS error: %s\n", safer_gnutls_strerror(ret));
602
gnutls_deinit(*session);
603
return -1;
604
}
605
}
606
607
do {
608
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
609
mc.cred);
610
if(quit_now){
611
gnutls_deinit(*session);
612
return -1;
613
}
614
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
615
if(ret != GNUTLS_E_SUCCESS){
616
fprintf(stderr, "Mandos plugin mandos-client: "
617
"Error setting GnuTLS credentials: %s\n",
618
safer_gnutls_strerror(ret));
619
gnutls_deinit(*session);
290
(es->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
291
if (ret != GNUTLS_E_SUCCESS) {
292
fprintf
293
(stderr, "Error[%d] while reading the OpenPGP key pair ('%s',"
294
" '%s')\n",
295
ret, pubkeyfile, seckeyfile);
296
fprintf(stdout, "The Error is: %s\n",
297
safer_gnutls_strerror(ret));
298
return -1;
299
}
300
301
//GnuTLS server initialization
302
if ((ret = gnutls_dh_params_init (&es->dh_params))
303
!= GNUTLS_E_SUCCESS) {
304
fprintf (stderr, "Error in dh parameter initialization: %s\n",
305
safer_gnutls_strerror(ret));
306
return -1;
307
}
308
309
if ((ret = gnutls_dh_params_generate2 (es->dh_params, dh_bits))
310
!= GNUTLS_E_SUCCESS) {
311
fprintf (stderr, "Error in prime generation: %s\n",
312
safer_gnutls_strerror(ret));
313
return -1;
314
}
315
316
gnutls_certificate_set_dh_params (es->cred, es->dh_params);
317
318
// GnuTLS session creation
319
if ((ret = gnutls_init (&es->session, GNUTLS_SERVER))
320
!= GNUTLS_E_SUCCESS){
321
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
322
safer_gnutls_strerror(ret));
323
}
324
325
if ((ret = gnutls_priority_set_direct (es->session, "NORMAL", &err))
326
!= GNUTLS_E_SUCCESS) {
327
fprintf(stderr, "Syntax error at: %s\n", err);
328
fprintf(stderr, "GnuTLS error: %s\n",
329
safer_gnutls_strerror(ret));
330
return -1;
331
}
332
333
if ((ret = gnutls_credentials_set
334
(es->session, GNUTLS_CRD_CERTIFICATE, es->cred))
335
!= GNUTLS_E_SUCCESS) {
336
fprintf(stderr, "Error setting a credentials set: %s\n",
337
safer_gnutls_strerror(ret));
620
338
return -1;
621
339
}
622
340
623
341
/* ignore client certificate if any. */
624
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
342
gnutls_certificate_server_set_request (es->session,
343
GNUTLS_CERT_IGNORE);
625
344
626
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
345
gnutls_dh_set_prime_bits (es->session, dh_bits);
627
346
628
347
return 0;
629
348
}
630
349
631
/* Avahi log function callback */
632
350
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
633
351
__attribute__((unused)) const char *txt){}
634
352
635
/* Called when a Mandos server is found */
636
353
static int start_mandos_communication(const char *ip, uint16_t port,
637
AvahiIfIndex if_index,
638
int af){
639
int ret, tcp_sd = -1;
640
ssize_t sret;
641
union {
642
struct sockaddr_in in;
643
struct sockaddr_in6 in6;
644
} to;
354
AvahiIfIndex if_index){
355
int ret, tcp_sd;
356
struct sockaddr_in6 to;
357
encrypted_session es;
645
358
char *buffer = NULL;
646
char *decrypted_buffer = NULL;
359
char *decrypted_buffer;
647
360
size_t buffer_length = 0;
648
361
size_t buffer_capacity = 0;
649
size_t written;
650
int retval = -1;
651
gnutls_session_t session;
652
int pf; /* Protocol family */
653
654
errno = 0;
655
656
if(quit_now){
657
errno = EINTR;
658
return -1;
659
}
660
661
switch(af){
662
case AF_INET6:
663
pf = PF_INET6;
664
break;
665
case AF_INET:
666
pf = PF_INET;
667
break;
668
default:
669
fprintf(stderr, "Mandos plugin mandos-client: "
670
"Bad address family: %d\n", af);
671
errno = EINVAL;
672
return -1;
673
}
674
675
ret = init_gnutls_session(&session);
676
if(ret != 0){
677
return -1;
678
}
679
680
if(debug){
681
fprintf(stderr, "Mandos plugin mandos-client: "
682
"Setting up a TCP connection to %s, port %" PRIu16
683
"\n", ip, port);
684
}
685
686
tcp_sd = socket(pf, SOCK_STREAM, 0);
687
if(tcp_sd < 0){
688
int e = errno;
689
perror_plus("socket");
690
errno = e;
691
goto mandos_end;
692
}
693
694
if(quit_now){
695
errno = EINTR;
696
goto mandos_end;
697
}
698
699
memset(&to, 0, sizeof(to));
700
if(af == AF_INET6){
701
to.in6.sin6_family = (sa_family_t)af;
702
ret = inet_pton(af, ip, &to.in6.sin6_addr);
703
} else { /* IPv4 */
704
to.in.sin_family = (sa_family_t)af;
705
ret = inet_pton(af, ip, &to.in.sin_addr);
706
}
707
if(ret < 0 ){
708
int e = errno;
709
perror_plus("inet_pton");
710
errno = e;
711
goto mandos_end;
712
}
362
ssize_t decrypted_buffer_size;
363
size_t written = 0;
364
int retval = 0;
365
char interface[IF_NAMESIZE];
366
367
if(debug){
368
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
369
ip, port);
370
}
371
372
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
373
if(tcp_sd < 0) {
374
perror("socket");
375
return -1;
376
}
377
378
if(if_indextoname((unsigned int)if_index, interface) == NULL){
379
if(debug){
380
perror("if_indextoname");
381
}
382
return -1;
383
}
384
385
if(debug){
386
fprintf(stderr, "Binding to interface %s\n", interface);
387
}
388
389
memset(&to,0,sizeof(to)); /* Spurious warning */
390
to.sin6_family = AF_INET6;
391
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
392
if (ret < 0 ){
393
perror("inet_pton");
394
return -1;
395
}
713
396
if(ret == 0){
714
int e = errno;
715
fprintf(stderr, "Mandos plugin mandos-client: "
716
"Bad address: %s\n", ip);
717
errno = e;
718
goto mandos_end;
719
}
720
if(af == AF_INET6){
721
to.in6.sin6_port = htons(port); /* Spurious warnings from
722
-Wconversion and
723
-Wunreachable-code */
724
725
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
726
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
727
-Wunreachable-code*/
728
if(if_index == AVAHI_IF_UNSPEC){
729
fprintf(stderr, "Mandos plugin mandos-client: "
730
"An IPv6 link-local address is incomplete"
731
" without a network interface\n");
732
errno = EINVAL;
733
goto mandos_end;
734
}
735
/* Set the network interface number as scope */
736
to.in6.sin6_scope_id = (uint32_t)if_index;
737
}
738
} else {
739
to.in.sin_port = htons(port); /* Spurious warnings from
740
-Wconversion and
741
-Wunreachable-code */
742
}
397
fprintf(stderr, "Bad address: %s\n", ip);
398
return -1;
399
}
400
to.sin6_port = htons(port); /* Spurious warning */
743
401
744
if(quit_now){
745
errno = EINTR;
746
goto mandos_end;
747
}
402
to.sin6_scope_id = (uint32_t)if_index;
748
403
749
404
if(debug){
750
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
751
char interface[IF_NAMESIZE];
752
if(if_indextoname((unsigned int)if_index, interface) == NULL){
753
perror_plus("if_indextoname");
754
} else {
755
fprintf(stderr, "Mandos plugin mandos-client: "
756
"Connection to: %s%%%s, port %" PRIu16 "\n",
757
ip, interface, port);
758
}
759
} else {
760
fprintf(stderr, "Mandos plugin mandos-client: "
761
"Connection to: %s, port %" PRIu16 "\n", ip, port);
762
}
763
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
764
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
765
const char *pcret;
766
if(af == AF_INET6){
767
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
768
sizeof(addrstr));
769
} else {
770
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
771
sizeof(addrstr));
772
}
773
if(pcret == NULL){
774
perror_plus("inet_ntop");
405
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
406
char addrstr[INET6_ADDRSTRLEN] = "";
407
if(inet_ntop(to.sin6_family, &(to.sin6_addr), addrstr,
408
sizeof(addrstr)) == NULL){
409
perror("inet_ntop");
775
410
} else {
776
411
if(strcmp(addrstr, ip) != 0){
777
fprintf(stderr, "Mandos plugin mandos-client: "
778
"Canonical address form: %s\n", addrstr);
779
}
780
}
781
}
782
783
if(quit_now){
784
errno = EINTR;
785
goto mandos_end;
786
}
787
788
if(af == AF_INET6){
789
ret = connect(tcp_sd, &to.in6, sizeof(to));
790
} else {
791
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
792
}
793
if(ret < 0){
794
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
795
int e = errno;
796
perror_plus("connect");
797
errno = e;
798
}
799
goto mandos_end;
800
}
801
802
if(quit_now){
803
errno = EINTR;
804
goto mandos_end;
805
}
806
807
const char *out = mandos_protocol_version;
808
written = 0;
809
while(true){
810
size_t out_size = strlen(out);
811
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
812
out_size - written));
813
if(ret == -1){
814
int e = errno;
815
perror_plus("write");
816
errno = e;
817
goto mandos_end;
818
}
819
written += (size_t)ret;
820
if(written < out_size){
821
continue;
822
} else {
823
if(out == mandos_protocol_version){
824
written = 0;
825
out = "\r\n";
826
} else {
827
break;
828
}
829
}
830
831
if(quit_now){
832
errno = EINTR;
833
goto mandos_end;
834
}
835
}
412
fprintf(stderr, "Canonical address form: %s\n",
413
addrstr, ntohs(to.sin6_port));
414
}
415
}
416
}
417
418
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
419
if (ret < 0){
420
perror("connect");
421
return -1;
422
}
423
424
ret = initgnutls (&es);
425
if (ret != 0){
426
retval = -1;
427
return -1;
428
}
429
430
gnutls_transport_set_ptr (es.session,
431
(gnutls_transport_ptr_t) tcp_sd);
836
432
837
433
if(debug){
838
fprintf(stderr, "Mandos plugin mandos-client: "
839
"Establishing TLS session with %s\n", ip);
840
}
841
842
if(quit_now){
843
errno = EINTR;
844
goto mandos_end;
845
}
846
847
/* Spurious warning from -Wint-to-pointer-cast */
848
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
849
850
if(quit_now){
851
errno = EINTR;
852
goto mandos_end;
853
}
854
855
do {
856
ret = gnutls_handshake(session);
857
if(quit_now){
858
errno = EINTR;
859
goto mandos_end;
860
}
861
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
862
863
if(ret != GNUTLS_E_SUCCESS){
434
fprintf(stderr, "Establishing TLS session with %s\n", ip);
435
}
436
437
ret = gnutls_handshake (es.session);
438
439
if (ret != GNUTLS_E_SUCCESS){
864
440
if(debug){
865
fprintf(stderr, "Mandos plugin mandos-client: "
866
"*** GnuTLS Handshake failed ***\n");
867
gnutls_perror(ret);
441
fprintf(stderr, "\n*** Handshake failed ***\n");
442
gnutls_perror (ret);
868
443
}
869
errno = EPROTO;
870
goto mandos_end;
444
retval = -1;
445
goto exit;
871
446
}
872
447
873
/* Read OpenPGP packet that contains the wanted password */
448
//Retrieve OpenPGP packet that contains the wanted password
874
449
875
450
if(debug){
876
fprintf(stderr, "Mandos plugin mandos-client: "
877
"Retrieving OpenPGP encrypted password from %s\n", ip);
451
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
452
ip);
878
453
}
879
454
880
455
while(true){
881
882
if(quit_now){
883
errno = EINTR;
884
goto mandos_end;
885
}
886
887
buffer_capacity = incbuffer(&buffer, buffer_length,
888
buffer_capacity);
889
if(buffer_capacity == 0){
890
int e = errno;
891
perror_plus("incbuffer");
892
errno = e;
893
goto mandos_end;
894
}
895
896
if(quit_now){
897
errno = EINTR;
898
goto mandos_end;
899
}
900
901
sret = gnutls_record_recv(session, buffer+buffer_length,
902
BUFFER_SIZE);
903
if(sret == 0){
456
if (buffer_length + BUFFER_SIZE > buffer_capacity){
457
buffer = realloc(buffer, buffer_capacity + BUFFER_SIZE);
458
if (buffer == NULL){
459
perror("realloc");
460
goto exit;
461
}
462
buffer_capacity += BUFFER_SIZE;
463
}
464
465
ret = gnutls_record_recv
466
(es.session, buffer+buffer_length, BUFFER_SIZE);
467
if (ret == 0){
904
468
break;
905
469
}
906
if(sret < 0){
907
switch(sret){
470
if (ret < 0){
471
switch(ret){
908
472
case GNUTLS_E_INTERRUPTED:
909
473
case GNUTLS_E_AGAIN:
910
474
break;
911
475
case GNUTLS_E_REHANDSHAKE:
912
do {
913
ret = gnutls_handshake(session);
914
915
if(quit_now){
916
errno = EINTR;
917
goto mandos_end;
918
}
919
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
920
if(ret < 0){
921
fprintf(stderr, "Mandos plugin mandos-client: "
922
"*** GnuTLS Re-handshake failed ***\n");
923
gnutls_perror(ret);
924
errno = EPROTO;
925
goto mandos_end;
476
ret = gnutls_handshake (es.session);
477
if (ret < 0){
478
fprintf(stderr, "\n*** Handshake failed ***\n");
479
gnutls_perror (ret);
480
retval = -1;
481
goto exit;
926
482
}
927
483
break;
928
484
default:
929
fprintf(stderr, "Mandos plugin mandos-client: "
930
"Unknown error while reading data from"
931
" encrypted session with Mandos server\n");
932
gnutls_bye(session, GNUTLS_SHUT_RDWR);
933
errno = EIO;
934
goto mandos_end;
485
fprintf(stderr, "Unknown error while reading data from"
486
" encrypted session with mandos server\n");
487
retval = -1;
488
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
489
goto exit;
935
490
}
936
491
} else {
937
buffer_length += (size_t) sret;
938
}
939
}
940
941
if(debug){
942
fprintf(stderr, "Mandos plugin mandos-client: "
943
"Closing TLS session\n");
944
}
945
946
if(quit_now){
947
errno = EINTR;
948
goto mandos_end;
949
}
950
951
do {
952
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
953
if(quit_now){
954
errno = EINTR;
955
goto mandos_end;
956
}
957
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
958
959
if(buffer_length > 0){
960
ssize_t decrypted_buffer_size;
961
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
962
&decrypted_buffer);
963
if(decrypted_buffer_size >= 0){
964
965
written = 0;
492
buffer_length += (size_t) ret;
493
}
494
}
495
496
if (buffer_length > 0){
497
decrypted_buffer_size = pgp_packet_decrypt(buffer,
498
buffer_length,
499
&decrypted_buffer,
500
keydir);
501
if (decrypted_buffer_size >= 0){
966
502
while(written < (size_t) decrypted_buffer_size){
967
if(quit_now){
968
errno = EINTR;
969
goto mandos_end;
970
}
971
972
ret = (int)fwrite(decrypted_buffer + written, 1,
973
(size_t)decrypted_buffer_size - written,
974
stdout);
503
ret = (int)fwrite (decrypted_buffer + written, 1,
504
(size_t)decrypted_buffer_size - written,
505
stdout);
975
506
if(ret == 0 and ferror(stdout)){
976
int e = errno;
977
507
if(debug){
978
fprintf(stderr, "Mandos plugin mandos-client: "
979
"Error writing encrypted data: %s\n",
508
fprintf(stderr, "Error writing encrypted data: %s\n",
980
509
strerror(errno));
981
510
}
982
errno = e;
983
goto mandos_end;
511
retval = -1;
512
break;
984
513
}
985
514
written += (size_t)ret;
986
515
}
987
retval = 0;
988
}
989
}
990
991
/* Shutdown procedure */
992
993
mandos_end:
994
{
995
int e = errno;
996
free(decrypted_buffer);
997
free(buffer);
998
if(tcp_sd >= 0){
999
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1000
}
1001
if(ret == -1){
1002
if(e == 0){
1003
e = errno;
1004
}
1005
perror_plus("close");
1006
}
1007
gnutls_deinit(session);
1008
errno = e;
1009
if(quit_now){
1010
errno = EINTR;
516
free(decrypted_buffer);
517
} else {
1011
518
retval = -1;
1012
519
}
1013
520
}
521
522
//shutdown procedure
523
524
if(debug){
525
fprintf(stderr, "Closing TLS session\n");
526
}
527
528
free(buffer);
529
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
530
exit:
531
close(tcp_sd);
532
gnutls_deinit (es.session);
533
gnutls_certificate_free_credentials (es.cred);
534
gnutls_global_deinit ();
1014
535
return retval;
1015
536
}
1016
537
1017
static void resolve_callback(AvahiSServiceResolver *r,
1018
AvahiIfIndex interface,
1019
AvahiProtocol proto,
1020
AvahiResolverEvent event,
1021
const char *name,
1022
const char *type,
1023
const char *domain,
1024
const char *host_name,
1025
const AvahiAddress *address,
1026
uint16_t port,
1027
AVAHI_GCC_UNUSED AvahiStringList *txt,
1028
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1029
flags,
1030
AVAHI_GCC_UNUSED void* userdata){
1031
assert(r);
538
static AvahiSimplePoll *simple_poll = NULL;
539
static AvahiServer *server = NULL;
540
541
static void resolve_callback(
542
AvahiSServiceResolver *r,
543
AvahiIfIndex interface,
544
AVAHI_GCC_UNUSED AvahiProtocol protocol,
545
AvahiResolverEvent event,
546
const char *name,
547
const char *type,
548
const char *domain,
549
const char *host_name,
550
const AvahiAddress *address,
551
uint16_t port,
552
AVAHI_GCC_UNUSED AvahiStringList *txt,
553
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
554
AVAHI_GCC_UNUSED void* userdata) {
555
556
assert(r); /* Spurious warning */
1032
557
1033
558
/* Called whenever a service has been resolved successfully or
1034
559
timed out */
1035
560
1036
if(quit_now){
1037
return;
1038
}
1039
1040
switch(event){
561
switch (event) {
1041
562
default:
1042
563
case AVAHI_RESOLVER_FAILURE:
1043
fprintf(stderr, "Mandos plugin mandos-client: "
1044
"(Avahi Resolver) Failed to resolve service '%s'"
1045
" of type '%s' in domain '%s': %s\n", name, type, domain,
1046
avahi_strerror(avahi_server_errno(mc.server)));
564
fprintf(stderr, "(Resolver) Failed to resolve service '%s' of"
565
" type '%s' in domain '%s': %s\n", name, type, domain,
566
avahi_strerror(avahi_server_errno(server)));
1047
567
break;
1048
568
1049
569
case AVAHI_RESOLVER_FOUND:
1051
571
char ip[AVAHI_ADDRESS_STR_MAX];
1052
572
avahi_address_snprint(ip, sizeof(ip), address);
1053
573
if(debug){
1054
fprintf(stderr, "Mandos plugin mandos-client: "
1055
"Mandos server \"%s\" found on %s (%s, %"
1056
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1057
ip, (intmax_t)interface, port);
574
fprintf(stderr, "Mandos server \"%s\" found on %s (%s) on"
575
" port %d\n", name, host_name, ip, port);
1058
576
}
1059
int ret = start_mandos_communication(ip, port, interface,
1060
avahi_proto_to_af(proto));
1061
if(ret == 0){
1062
avahi_simple_poll_quit(mc.simple_poll);
1063
} else {
1064
ret = add_server(ip, port, interface,
1065
avahi_proto_to_af(proto));
577
int ret = start_mandos_communication(ip, port, interface);
578
if (ret == 0){
579
exit(EXIT_SUCCESS);
1066
580
}
1067
581
}
1068
582
}
1069
583
avahi_s_service_resolver_free(r);
1070
584
}
1071
585
1072
static void browse_callback(AvahiSServiceBrowser *b,
1073
AvahiIfIndex interface,
1074
AvahiProtocol protocol,
1075
AvahiBrowserEvent event,
1076
const char *name,
1077
const char *type,
1078
const char *domain,
1079
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1080
flags,
1081
AVAHI_GCC_UNUSED void* userdata){
1082
assert(b);
1083
1084
/* Called whenever a new services becomes available on the LAN or
1085
is removed from the LAN */
1086
1087
if(quit_now){
1088
return;
1089
}
1090
1091
switch(event){
1092
default:
1093
case AVAHI_BROWSER_FAILURE:
1094
1095
fprintf(stderr, "Mandos plugin mandos-client: "
1096
"(Avahi browser) %s\n",
1097
avahi_strerror(avahi_server_errno(mc.server)));
1098
avahi_simple_poll_quit(mc.simple_poll);
1099
return;
1100
1101
case AVAHI_BROWSER_NEW:
1102
/* We ignore the returned Avahi resolver object. In the callback
1103
function we free it. If the Avahi server is terminated before
1104
the callback function is called the Avahi server will free the
1105
resolver for us. */
1106
1107
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1108
name, type, domain, protocol, 0,
1109
resolve_callback, NULL) == NULL)
1110
fprintf(stderr, "Mandos plugin mandos-client: "
1111
"Avahi: Failed to resolve service '%s': %s\n",
1112
name, avahi_strerror(avahi_server_errno(mc.server)));
1113
break;
1114
1115
case AVAHI_BROWSER_REMOVE:
1116
break;
1117
1118
case AVAHI_BROWSER_ALL_FOR_NOW:
1119
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1120
if(debug){
1121
fprintf(stderr, "Mandos plugin mandos-client: "
1122
"No Mandos server found, still searching...\n");
1123
}
1124
break;
1125
}
1126
}
1127
1128
/* Signal handler that stops main loop after SIGTERM */
1129
static void handle_sigterm(int sig){
1130
if(quit_now){
1131
return;
1132
}
1133
quit_now = 1;
1134
signal_received = sig;
1135
int old_errno = errno;
1136
/* set main loop to exit */
1137
if(mc.simple_poll != NULL){
1138
avahi_simple_poll_quit(mc.simple_poll);
1139
}
1140
errno = old_errno;
1141
}
1142
1143
bool get_flags(const char *ifname, struct ifreq *ifr){
1144
int ret;
1145
1146
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1147
if(s < 0){
1148
perror_plus("socket");
1149
return false;
1150
}
1151
strcpy(ifr->ifr_name, ifname);
1152
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1153
if(ret == -1){
1154
if(debug){
1155
perror_plus("ioctl SIOCGIFFLAGS");
1156
}
1157
return false;
1158
}
1159
return true;
1160
}
1161
1162
bool good_flags(const char *ifname, const struct ifreq *ifr){
1163
1164
/* Reject the loopback device */
1165
if(ifr->ifr_flags & IFF_LOOPBACK){
1166
if(debug){
1167
fprintf(stderr, "Mandos plugin mandos-client: "
1168
"Rejecting loopback interface \"%s\"\n", ifname);
1169
}
1170
return false;
1171
}
1172
/* Accept point-to-point devices only if connect_to is specified */
1173
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1174
if(debug){
1175
fprintf(stderr, "Mandos plugin mandos-client: "
1176
"Accepting point-to-point interface \"%s\"\n", ifname);
1177
}
1178
return true;
1179
}
1180
/* Otherwise, reject non-broadcast-capable devices */
1181
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1182
if(debug){
1183
fprintf(stderr, "Mandos plugin mandos-client: "
1184
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1185
}
1186
return false;
1187
}
1188
/* Reject non-ARP interfaces (including dummy interfaces) */
1189
if(ifr->ifr_flags & IFF_NOARP){
1190
if(debug){
1191
fprintf(stderr, "Mandos plugin mandos-client: "
1192
"Rejecting non-ARP interface \"%s\"\n", ifname);
1193
}
1194
return false;
1195
}
1196
1197
/* Accept this device */
1198
if(debug){
1199
fprintf(stderr, "Mandos plugin mandos-client: "
1200
"Interface \"%s\" is good\n", ifname);
1201
}
1202
return true;
1203
}
1204
1205
/*
1206
* This function determines if a directory entry in /sys/class/net
1207
* corresponds to an acceptable network device.
1208
* (This function is passed to scandir(3) as a filter function.)
1209
*/
1210
int good_interface(const struct dirent *if_entry){
1211
if(if_entry->d_name[0] == '.'){
1212
return 0;
1213
}
1214
1215
struct ifreq ifr;
1216
if(not get_flags(if_entry->d_name, &ifr)){
1217
if(debug){
1218
fprintf(stderr, "Mandos plugin mandos-client: "
1219
"Failed to get flags for interface \"%s\"\n",
1220
if_entry->d_name);
1221
}
1222
return 0;
1223
}
1224
1225
if(not good_flags(if_entry->d_name, &ifr)){
1226
return 0;
1227
}
1228
return 1;
1229
}
1230
1231
/*
1232
* This function determines if a directory entry in /sys/class/net
1233
* corresponds to an acceptable network device which is up.
1234
* (This function is passed to scandir(3) as a filter function.)
1235
*/
1236
int up_interface(const struct dirent *if_entry){
1237
if(if_entry->d_name[0] == '.'){
1238
return 0;
1239
}
1240
1241
struct ifreq ifr;
1242
if(not get_flags(if_entry->d_name, &ifr)){
1243
if(debug){
1244
fprintf(stderr, "Mandos plugin mandos-client: "
1245
"Failed to get flags for interface \"%s\"\n",
1246
if_entry->d_name);
1247
}
1248
return 0;
1249
}
1250
1251
/* Reject down interfaces */
1252
if(not (ifr.ifr_flags & IFF_UP)){
1253
if(debug){
1254
fprintf(stderr, "Mandos plugin mandos-client: "
1255
"Rejecting down interface \"%s\"\n",
1256
if_entry->d_name);
1257
}
1258
return 0;
1259
}
1260
1261
/* Reject non-running interfaces */
1262
if(not (ifr.ifr_flags & IFF_RUNNING)){
1263
if(debug){
1264
fprintf(stderr, "Mandos plugin mandos-client: "
1265
"Rejecting non-running interface \"%s\"\n",
1266
if_entry->d_name);
1267
}
1268
return 0;
1269
}
1270
1271
if(not good_flags(if_entry->d_name, &ifr)){
1272
return 0;
1273
}
1274
return 1;
1275
}
1276
1277
int notdotentries(const struct dirent *direntry){
1278
/* Skip "." and ".." */
1279
if(direntry->d_name[0] == '.'
1280
and (direntry->d_name[1] == '\0'
1281
or (direntry->d_name[1] == '.'
1282
and direntry->d_name[2] == '\0'))){
1283
return 0;
1284
}
1285
return 1;
1286
}
1287
1288
/* Is this directory entry a runnable program? */
1289
int runnable_hook(const struct dirent *direntry){
1290
int ret;
1291
size_t sret;
1292
struct stat st;
1293
1294
if((direntry->d_name)[0] == '\0'){
1295
/* Empty name? */
1296
return 0;
1297
}
1298
1299
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1300
"abcdefghijklmnopqrstuvwxyz"
1301
"0123456789"
1302
"_-");
1303
if((direntry->d_name)[sret] != '\0'){
1304
/* Contains non-allowed characters */
1305
if(debug){
1306
fprintf(stderr, "Mandos plugin mandos-client: "
1307
"Ignoring hook \"%s\" with bad name\n",
1308
direntry->d_name);
1309
}
1310
return 0;
1311
}
1312
1313
char *fullname = NULL;
1314
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1315
if(ret < 0){
1316
perror_plus("asprintf");
1317
return 0;
1318
}
1319
1320
ret = stat(fullname, &st);
1321
if(ret == -1){
1322
if(debug){
1323
perror_plus("Could not stat hook");
1324
}
1325
return 0;
1326
}
1327
if(not (S_ISREG(st.st_mode))){
1328
/* Not a regular file */
1329
if(debug){
1330
fprintf(stderr, "Mandos plugin mandos-client: "
1331
"Ignoring hook \"%s\" - not a file\n",
1332
direntry->d_name);
1333
}
1334
return 0;
1335
}
1336
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1337
/* Not executable */
1338
if(debug){
1339
fprintf(stderr, "Mandos plugin mandos-client: "
1340
"Ignoring hook \"%s\" - not executable\n",
1341
direntry->d_name);
1342
}
1343
return 0;
1344
}
1345
return 1;
1346
}
1347
1348
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1349
int ret;
1350
struct timespec now;
1351
struct timespec waited_time;
1352
intmax_t block_time;
1353
1354
while(true){
1355
if(mc.current_server == NULL){
1356
if (debug){
1357
fprintf(stderr, "Mandos plugin mandos-client: "
1358
"Wait until first server is found. No timeout!\n");
1359
}
1360
ret = avahi_simple_poll_iterate(s, -1);
1361
} else {
1362
if (debug){
1363
fprintf(stderr, "Mandos plugin mandos-client: "
1364
"Check current_server if we should run it,"
1365
" or wait\n");
1366
}
1367
/* the current time */
1368
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1369
if(ret == -1){
1370
perror_plus("clock_gettime");
1371
return -1;
1372
}
1373
/* Calculating in ms how long time between now and server
1374
who we visted longest time ago. Now - last seen. */
1375
waited_time.tv_sec = (now.tv_sec
1376
- mc.current_server->last_seen.tv_sec);
1377
waited_time.tv_nsec = (now.tv_nsec
1378
- mc.current_server->last_seen.tv_nsec);
1379
/* total time is 10s/10,000ms.
1380
Converting to s from ms by dividing by 1,000,
1381
and ns to ms by dividing by 1,000,000. */
1382
block_time = ((retry_interval
1383
- ((intmax_t)waited_time.tv_sec * 1000))
1384
- ((intmax_t)waited_time.tv_nsec / 1000000));
1385
1386
if (debug){
1387
fprintf(stderr, "Mandos plugin mandos-client: "
1388
"Blocking for %" PRIdMAX " ms\n", block_time);
1389
}
1390
1391
if(block_time <= 0){
1392
ret = start_mandos_communication(mc.current_server->ip,
1393
mc.current_server->port,
1394
mc.current_server->if_index,
1395
mc.current_server->af);
1396
if(ret == 0){
1397
avahi_simple_poll_quit(mc.simple_poll);
1398
return 0;
1399
}
1400
ret = clock_gettime(CLOCK_MONOTONIC,
1401
&mc.current_server->last_seen);
1402
if(ret == -1){
1403
perror_plus("clock_gettime");
1404
return -1;
1405
}
1406
mc.current_server = mc.current_server->next;
1407
block_time = 0; /* Call avahi to find new Mandos
1408
servers, but don't block */
1409
}
1410
1411
ret = avahi_simple_poll_iterate(s, (int)block_time);
1412
}
1413
if(ret != 0){
1414
if (ret > 0 or errno != EINTR){
1415
return (ret != 1) ? ret : 0;
1416
}
1417
}
1418
}
1419
}
1420
1421
int main(int argc, char *argv[]){
1422
AvahiSServiceBrowser *sb = NULL;
1423
int error;
1424
int ret;
1425
intmax_t tmpmax;
1426
char *tmp;
1427
int exitcode = EXIT_SUCCESS;
1428
const char *interface = "";
1429
struct ifreq network;
1430
int sd = -1;
1431
bool take_down_interface = false;
1432
uid_t uid;
1433
gid_t gid;
1434
char tempdir[] = "/tmp/mandosXXXXXX";
1435
bool tempdir_created = false;
1436
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1437
const char *seckey = PATHDIR "/" SECKEY;
1438
const char *pubkey = PATHDIR "/" PUBKEY;
1439
1440
bool gnutls_initialized = false;
1441
bool gpgme_initialized = false;
1442
float delay = 2.5f;
1443
double retry_interval = 10; /* 10s between trying a server and
1444
retrying the same server again */
1445
1446
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1447
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1448
1449
uid = getuid();
1450
gid = getgid();
1451
1452
/* Lower any group privileges we might have, just to be safe */
1453
errno = 0;
1454
ret = setgid(gid);
1455
if(ret == -1){
1456
perror_plus("setgid");
1457
}
1458
1459
/* Lower user privileges (temporarily) */
1460
errno = 0;
1461
ret = seteuid(uid);
1462
if(ret == -1){
1463
perror_plus("seteuid");
1464
}
1465
1466
if(quit_now){
1467
goto end;
1468
}
1469
1470
{
1471
struct argp_option options[] = {
1472
{ .name = "debug", .key = 128,
1473
.doc = "Debug mode", .group = 3 },
1474
{ .name = "connect", .key = 'c',
1475
.arg = "ADDRESS:PORT",
1476
.doc = "Connect directly to a specific Mandos server",
1477
.group = 1 },
1478
{ .name = "interface", .key = 'i',
1479
.arg = "NAME",
1480
.doc = "Network interface that will be used to search for"
1481
" Mandos servers",
1482
.group = 1 },
1483
{ .name = "seckey", .key = 's',
1484
.arg = "FILE",
1485
.doc = "OpenPGP secret key file base name",
1486
.group = 1 },
1487
{ .name = "pubkey", .key = 'p',
1488
.arg = "FILE",
1489
.doc = "OpenPGP public key file base name",
1490
.group = 2 },
1491
{ .name = "dh-bits", .key = 129,
1492
.arg = "BITS",
1493
.doc = "Bit length of the prime number used in the"
1494
" Diffie-Hellman key exchange",
1495
.group = 2 },
1496
{ .name = "priority", .key = 130,
1497
.arg = "STRING",
1498
.doc = "GnuTLS priority string for the TLS handshake",
1499
.group = 1 },
1500
{ .name = "delay", .key = 131,
1501
.arg = "SECONDS",
1502
.doc = "Maximum delay to wait for interface startup",
1503
.group = 2 },
1504
{ .name = "retry", .key = 132,
1505
.arg = "SECONDS",
1506
.doc = "Retry interval used when denied by the mandos server",
1507
.group = 2 },
1508
{ .name = "network-hook-dir", .key = 133,
1509
.arg = "DIR",
1510
.doc = "Directory where network hooks are located",
1511
.group = 2 },
1512
/*
1513
* These reproduce what we would get without ARGP_NO_HELP
1514
*/
1515
{ .name = "help", .key = '?',
1516
.doc = "Give this help list", .group = -1 },
1517
{ .name = "usage", .key = -3,
1518
.doc = "Give a short usage message", .group = -1 },
1519
{ .name = "version", .key = 'V',
1520
.doc = "Print program version", .group = -1 },
1521
{ .name = NULL }
1522
};
1523
1524
error_t parse_opt(int key, char *arg,
1525
struct argp_state *state){
1526
errno = 0;
1527
switch(key){
1528
case 128: /* --debug */
1529
debug = true;
1530
break;
1531
case 'c': /* --connect */
1532
connect_to = arg;
1533
break;
1534
case 'i': /* --interface */
1535
interface = arg;
1536
break;
1537
case 's': /* --seckey */
1538
seckey = arg;
1539
break;
1540
case 'p': /* --pubkey */
1541
pubkey = arg;
1542
break;
1543
case 129: /* --dh-bits */
1544
errno = 0;
1545
tmpmax = strtoimax(arg, &tmp, 10);
1546
if(errno != 0 or tmp == arg or *tmp != '\0'
1547
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1548
argp_error(state, "Bad number of DH bits");
1549
}
1550
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1551
break;
1552
case 130: /* --priority */
1553
mc.priority = arg;
1554
break;
1555
case 131: /* --delay */
1556
errno = 0;
1557
delay = strtof(arg, &tmp);
1558
if(errno != 0 or tmp == arg or *tmp != '\0'){
1559
argp_error(state, "Bad delay");
1560
}
1561
case 132: /* --retry */
1562
errno = 0;
1563
retry_interval = strtod(arg, &tmp);
1564
if(errno != 0 or tmp == arg or *tmp != '\0'
1565
or (retry_interval * 1000) > INT_MAX
1566
or retry_interval < 0){
1567
argp_error(state, "Bad retry interval");
1568
}
1569
break;
1570
case 133: /* --network-hook-dir */
1571
hookdir = arg;
1572
break;
1573
/*
1574
* These reproduce what we would get without ARGP_NO_HELP
1575
*/
1576
case '?': /* --help */
1577
argp_state_help(state, state->out_stream,
1578
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1579
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1580
case -3: /* --usage */
1581
argp_state_help(state, state->out_stream,
1582
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1583
case 'V': /* --version */
1584
fprintf(state->out_stream, "Mandos plugin mandos-client: ");
1585
fprintf(state->out_stream, "%s\n", argp_program_version);
1586
exit(argp_err_exit_status);
1587
break;
1588
default:
1589
return ARGP_ERR_UNKNOWN;
1590
}
1591
return errno;
1592
}
1593
1594
struct argp argp = { .options = options, .parser = parse_opt,
1595
.args_doc = "",
1596
.doc = "Mandos client -- Get and decrypt"
1597
" passwords from a Mandos server" };
1598
ret = argp_parse(&argp, argc, argv,
1599
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1600
switch(ret){
1601
case 0:
1602
break;
1603
case ENOMEM:
586
static void browse_callback(
587
AvahiSServiceBrowser *b,
588
AvahiIfIndex interface,
589
AvahiProtocol protocol,
590
AvahiBrowserEvent event,
591
const char *name,
592
const char *type,
593
const char *domain,
594
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
595
void* userdata) {
596
597
AvahiServer *s = userdata;
598
assert(b); /* Spurious warning */
599
600
/* Called whenever a new services becomes available on the LAN or
601
is removed from the LAN */
602
603
switch (event) {
1604
604
default:
1605
errno = ret;
1606
perror_plus("argp_parse");
1607
exitcode = EX_OSERR;
1608
goto end;
1609
case EINVAL:
1610
exitcode = EX_USAGE;
1611
goto end;
1612
}
1613
}
1614
1615
{
1616
/* Work around Debian bug #633582:
1617
<http://bugs.debian.org/633582> */
1618
struct stat st;
1619
1620
/* Re-raise priviliges */
1621
errno = 0;
1622
ret = seteuid(0);
1623
if(ret == -1){
1624
perror_plus("seteuid");
1625
}
1626
1627
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1628
int seckey_fd = open(seckey, O_RDONLY);
1629
if(seckey_fd == -1){
1630
perror_plus("open");
1631
} else {
1632
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1633
if(ret == -1){
1634
perror_plus("fstat");
1635
} else {
1636
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1637
ret = fchown(seckey_fd, uid, gid);
1638
if(ret == -1){
1639
perror_plus("fchown");
1640
}
1641
}
1642
}
1643
TEMP_FAILURE_RETRY(close(seckey_fd));
1644
}
1645
}
1646
1647
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1648
int pubkey_fd = open(pubkey, O_RDONLY);
1649
if(pubkey_fd == -1){
1650
perror_plus("open");
1651
} else {
1652
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1653
if(ret == -1){
1654
perror_plus("fstat");
1655
} else {
1656
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1657
ret = fchown(pubkey_fd, uid, gid);
1658
if(ret == -1){
1659
perror_plus("fchown");
1660
}
1661
}
1662
}
1663
TEMP_FAILURE_RETRY(close(pubkey_fd));
1664
}
1665
}
1666
1667
/* Lower privileges */
1668
errno = 0;
1669
ret = seteuid(uid);
1670
if(ret == -1){
1671
perror_plus("seteuid");
1672
}
1673
}
1674
1675
/* Find network hooks and run them */
1676
{
1677
struct dirent **direntries;
1678
struct dirent *direntry;
1679
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1680
alphasort);
1681
if(numhooks == -1){
1682
perror_plus("scandir");
1683
} else {
1684
int devnull = open("/dev/null", O_RDONLY);
1685
for(int i = 0; i < numhooks; i++){
1686
direntry = direntries[0];
1687
char *fullname = NULL;
1688
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1689
if(ret < 0){
1690
perror_plus("asprintf");
1691
continue;
1692
}
1693
pid_t hook_pid = fork();
1694
if(hook_pid == 0){
1695
/* Child */
1696
dup2(devnull, STDIN_FILENO);
1697
close(devnull);
1698
dup2(STDERR_FILENO, STDOUT_FILENO);
1699
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1700
if(ret == -1){
1701
perror_plus("setenv");
1702
exit(1);
1703
}
1704
ret = setenv("DEVICE", interface, 1);
1705
if(ret == -1){
1706
perror_plus("setenv");
1707
exit(1);
1708
}
1709
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1710
if(ret == -1){
1711
perror_plus("setenv");
1712
exit(1);
1713
}
1714
ret = setenv("MODE", "start", 1);
1715
if(ret == -1){
1716
perror_plus("setenv");
1717
exit(1);
1718
}
1719
char *delaystring;
1720
ret = asprintf(&delaystring, "%f", delay);
1721
if(ret == -1){
1722
perror_plus("asprintf");
1723
exit(1);
1724
}
1725
ret = setenv("DELAY", delaystring, 1);
1726
if(ret == -1){
1727
free(delaystring);
1728
perror_plus("setenv");
1729
exit(1);
1730
}
1731
free(delaystring);
1732
ret = execl(fullname, direntry->d_name, "start", NULL);
1733
perror_plus("execl");
1734
} else {
1735
int status;
1736
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1737
perror_plus("waitpid");
1738
free(fullname);
1739
continue;
1740
}
1741
if(WIFEXITED(status)){
1742
if(WEXITSTATUS(status) != 0){
1743
fprintf(stderr, "Mandos plugin mandos-client: "
1744
"Warning: network hook \"%s\" exited"
1745
" with status %d\n", direntry->d_name,
1746
WEXITSTATUS(status));
1747
free(fullname);
1748
continue;
1749
}
1750
} else if(WIFSIGNALED(status)){
1751
fprintf(stderr, "Mandos plugin mandos-client: "
1752
"Warning: network hook \"%s\" died by"
1753
" signal %d\n", direntry->d_name,
1754
WTERMSIG(status));
1755
free(fullname);
1756
continue;
1757
} else {
1758
fprintf(stderr, "Mandos plugin mandos-client: "
1759
"Warning: network hook \"%s\" crashed\n",
1760
direntry->d_name);
1761
free(fullname);
1762
continue;
1763
}
1764
}
1765
free(fullname);
1766
if(quit_now){
1767
goto end;
1768
}
1769
}
1770
close(devnull);
1771
}
1772
}
1773
1774
if(not debug){
1775
avahi_set_log_function(empty_log);
1776
}
1777
1778
if(interface[0] == '\0'){
1779
struct dirent **direntries;
1780
/* First look for interfaces that are up */
1781
ret = scandir(sys_class_net, &direntries, up_interface,
1782
alphasort);
1783
if(ret == 0){
1784
/* No up interfaces, look for any good interfaces */
1785
free(direntries);
1786
ret = scandir(sys_class_net, &direntries, good_interface,
1787
alphasort);
1788
}
1789
if(ret >= 1){
1790
/* Pick the first interface returned */
1791
interface = strdup(direntries[0]->d_name);
1792
if(debug){
1793
fprintf(stderr, "Mandos plugin mandos-client: "
1794
"Using interface \"%s\"\n", interface);
1795
}
1796
if(interface == NULL){
1797
perror_plus("malloc");
1798
free(direntries);
1799
exitcode = EXIT_FAILURE;
1800
goto end;
1801
}
1802
free(direntries);
1803
} else {
1804
free(direntries);
1805
fprintf(stderr, "Mandos plugin mandos-client: "
1806
"Could not find a network interface\n");
1807
exitcode = EXIT_FAILURE;
1808
goto end;
1809
}
1810
}
1811
1812
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1813
from the signal handler */
1814
/* Initialize the pseudo-RNG for Avahi */
1815
srand((unsigned int) time(NULL));
1816
mc.simple_poll = avahi_simple_poll_new();
1817
if(mc.simple_poll == NULL){
1818
fprintf(stderr, "Mandos plugin mandos-client: "
1819
"Avahi: Failed to create simple poll object.\n");
1820
exitcode = EX_UNAVAILABLE;
1821
goto end;
1822
}
1823
1824
sigemptyset(&sigterm_action.sa_mask);
1825
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1826
if(ret == -1){
1827
perror_plus("sigaddset");
1828
exitcode = EX_OSERR;
1829
goto end;
1830
}
1831
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1832
if(ret == -1){
1833
perror_plus("sigaddset");
1834
exitcode = EX_OSERR;
1835
goto end;
1836
}
1837
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1838
if(ret == -1){
1839
perror_plus("sigaddset");
1840
exitcode = EX_OSERR;
1841
goto end;
1842
}
1843
/* Need to check if the handler is SIG_IGN before handling:
1844
| [[info:libc:Initial Signal Actions]] |
1845
| [[info:libc:Basic Signal Handling]] |
1846
*/
1847
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1848
if(ret == -1){
1849
perror_plus("sigaction");
1850
return EX_OSERR;
1851
}
1852
if(old_sigterm_action.sa_handler != SIG_IGN){
1853
ret = sigaction(SIGINT, &sigterm_action, NULL);
1854
if(ret == -1){
1855
perror_plus("sigaction");
1856
exitcode = EX_OSERR;
1857
goto end;
1858
}
1859
}
1860
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1861
if(ret == -1){
1862
perror_plus("sigaction");
1863
return EX_OSERR;
1864
}
1865
if(old_sigterm_action.sa_handler != SIG_IGN){
1866
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1867
if(ret == -1){
1868
perror_plus("sigaction");
1869
exitcode = EX_OSERR;
1870
goto end;
1871
}
1872
}
1873
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1874
if(ret == -1){
1875
perror_plus("sigaction");
1876
return EX_OSERR;
1877
}
1878
if(old_sigterm_action.sa_handler != SIG_IGN){
1879
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1880
if(ret == -1){
1881
perror_plus("sigaction");
1882
exitcode = EX_OSERR;
1883
goto end;
1884
}
1885
}
1886
1887
/* If the interface is down, bring it up */
1888
if(strcmp(interface, "none") != 0){
1889
if_index = (AvahiIfIndex) if_nametoindex(interface);
1890
if(if_index == 0){
1891
fprintf(stderr, "Mandos plugin mandos-client: "
1892
"No such interface: \"%s\"\n", interface);
1893
exitcode = EX_UNAVAILABLE;
1894
goto end;
1895
}
1896
1897
if(quit_now){
1898
goto end;
1899
}
1900
1901
/* Re-raise priviliges */
1902
errno = 0;
1903
ret = seteuid(0);
1904
if(ret == -1){
1905
perror_plus("seteuid");
1906
}
1907
1908
#ifdef __linux__
1909
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1910
messages about the network interface to mess up the prompt */
1911
ret = klogctl(8, NULL, 5);
1912
bool restore_loglevel = true;
1913
if(ret == -1){
1914
restore_loglevel = false;
1915
perror_plus("klogctl");
1916
}
1917
#endif /* __linux__ */
1918
1919
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1920
if(sd < 0){
1921
perror_plus("socket");
1922
exitcode = EX_OSERR;
1923
#ifdef __linux__
1924
if(restore_loglevel){
1925
ret = klogctl(7, NULL, 0);
1926
if(ret == -1){
1927
perror_plus("klogctl");
1928
}
1929
}
1930
#endif /* __linux__ */
1931
/* Lower privileges */
1932
errno = 0;
1933
ret = seteuid(uid);
1934
if(ret == -1){
1935
perror_plus("seteuid");
1936
}
1937
goto end;
1938
}
1939
strcpy(network.ifr_name, interface);
1940
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1941
if(ret == -1){
1942
perror_plus("ioctl SIOCGIFFLAGS");
1943
#ifdef __linux__
1944
if(restore_loglevel){
1945
ret = klogctl(7, NULL, 0);
1946
if(ret == -1){
1947
perror_plus("klogctl");
1948
}
1949
}
1950
#endif /* __linux__ */
1951
exitcode = EX_OSERR;
1952
/* Lower privileges */
1953
errno = 0;
1954
ret = seteuid(uid);
1955
if(ret == -1){
1956
perror_plus("seteuid");
1957
}
1958
goto end;
1959
}
1960
if((network.ifr_flags & IFF_UP) == 0){
1961
network.ifr_flags |= IFF_UP;
1962
take_down_interface = true;
1963
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1964
if(ret == -1){
1965
take_down_interface = false;
1966
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1967
exitcode = EX_OSERR;
1968
#ifdef __linux__
1969
if(restore_loglevel){
1970
ret = klogctl(7, NULL, 0);
1971
if(ret == -1){
1972
perror_plus("klogctl");
1973
}
1974
}
1975
#endif /* __linux__ */
1976
/* Lower privileges */
1977
errno = 0;
1978
ret = seteuid(uid);
1979
if(ret == -1){
1980
perror_plus("seteuid");
1981
}
1982
goto end;
1983
}
1984
}
1985
/* Sleep checking until interface is running.
1986
Check every 0.25s, up to total time of delay */
1987
for(int i=0; i < delay * 4; i++){
1988
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1989
if(ret == -1){
1990
perror_plus("ioctl SIOCGIFFLAGS");
1991
} else if(network.ifr_flags & IFF_RUNNING){
1992
break;
1993
}
1994
struct timespec sleeptime = { .tv_nsec = 250000000 };
1995
ret = nanosleep(&sleeptime, NULL);
1996
if(ret == -1 and errno != EINTR){
1997
perror_plus("nanosleep");
1998
}
1999
}
2000
if(not take_down_interface){
2001
/* We won't need the socket anymore */
2002
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2003
if(ret == -1){
2004
perror_plus("close");
2005
}
2006
}
2007
#ifdef __linux__
2008
if(restore_loglevel){
2009
/* Restores kernel loglevel to default */
2010
ret = klogctl(7, NULL, 0);
2011
if(ret == -1){
2012
perror_plus("klogctl");
2013
}
2014
}
2015
#endif /* __linux__ */
2016
/* Lower privileges */
2017
errno = 0;
2018
if(take_down_interface){
2019
/* Lower privileges */
2020
ret = seteuid(uid);
2021
if(ret == -1){
2022
perror_plus("seteuid");
2023
}
2024
} else {
2025
/* Lower privileges permanently */
2026
ret = setuid(uid);
2027
if(ret == -1){
2028
perror_plus("setuid");
2029
}
2030
}
2031
}
2032
2033
if(quit_now){
2034
goto end;
2035
}
2036
2037
ret = init_gnutls_global(pubkey, seckey);
2038
if(ret == -1){
2039
fprintf(stderr, "Mandos plugin mandos-client: "
2040
"init_gnutls_global failed\n");
2041
exitcode = EX_UNAVAILABLE;
2042
goto end;
2043
} else {
2044
gnutls_initialized = true;
2045
}
2046
2047
if(quit_now){
2048
goto end;
2049
}
2050
2051
if(mkdtemp(tempdir) == NULL){
2052
perror_plus("mkdtemp");
2053
goto end;
2054
}
2055
tempdir_created = true;
2056
2057
if(quit_now){
2058
goto end;
2059
}
2060
2061
if(not init_gpgme(pubkey, seckey, tempdir)){
2062
fprintf(stderr, "Mandos plugin mandos-client: "
2063
"init_gpgme failed\n");
2064
exitcode = EX_UNAVAILABLE;
2065
goto end;
2066
} else {
2067
gpgme_initialized = true;
2068
}
2069
2070
if(quit_now){
2071
goto end;
2072
}
2073
2074
if(connect_to != NULL){
2075
/* Connect directly, do not use Zeroconf */
2076
/* (Mainly meant for debugging) */
2077
char *address = strrchr(connect_to, ':');
2078
if(address == NULL){
2079
fprintf(stderr, "Mandos plugin mandos-client: "
2080
"No colon in address\n");
2081
exitcode = EX_USAGE;
2082
goto end;
2083
}
2084
2085
if(quit_now){
2086
goto end;
2087
}
2088
2089
uint16_t port;
2090
errno = 0;
2091
tmpmax = strtoimax(address+1, &tmp, 10);
2092
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2093
or tmpmax != (uint16_t)tmpmax){
2094
fprintf(stderr, "Mandos plugin mandos-client: "
2095
"Bad port number\n");
2096
exitcode = EX_USAGE;
2097
goto end;
2098
}
2099
2100
if(quit_now){
2101
goto end;
2102
}
2103
2104
port = (uint16_t)tmpmax;
2105
*address = '\0';
2106
/* Colon in address indicates IPv6 */
2107
int af;
2108
if(strchr(connect_to, ':') != NULL){
2109
af = AF_INET6;
2110
/* Accept [] around IPv6 address - see RFC 5952 */
2111
if(connect_to[0] == '[' and address[-1] == ']')
2112
{
2113
connect_to++;
2114
address[-1] = '\0';
2115
}
2116
} else {
2117
af = AF_INET;
2118
}
2119
address = connect_to;
2120
2121
if(quit_now){
2122
goto end;
2123
}
2124
2125
while(not quit_now){
2126
ret = start_mandos_communication(address, port, if_index, af);
2127
if(quit_now or ret == 0){
2128
break;
2129
}
2130
if(debug){
2131
fprintf(stderr, "Mandos plugin mandos-client: "
2132
"Retrying in %d seconds\n", (int)retry_interval);
2133
}
2134
sleep((int)retry_interval);
2135
}
2136
2137
if (not quit_now){
2138
exitcode = EXIT_SUCCESS;
2139
}
2140
2141
goto end;
2142
}
2143
2144
if(quit_now){
2145
goto end;
2146
}
2147
2148
{
605
case AVAHI_BROWSER_FAILURE:
606
607
fprintf(stderr, "(Browser) %s\n",
608
avahi_strerror(avahi_server_errno(server)));
609
avahi_simple_poll_quit(simple_poll);
610
return;
611
612
case AVAHI_BROWSER_NEW:
613
/* We ignore the returned resolver object. In the callback
614
function we free it. If the server is terminated before
615
the callback function is called the server will free
616
the resolver for us. */
617
618
if (!(avahi_s_service_resolver_new(s, interface, protocol, name,
619
type, domain,
620
AVAHI_PROTO_INET6, 0,
621
resolve_callback, s)))
622
fprintf(stderr, "Failed to resolve service '%s': %s\n", name,
623
avahi_strerror(avahi_server_errno(s)));
624
break;
625
626
case AVAHI_BROWSER_REMOVE:
627
break;
628
629
case AVAHI_BROWSER_ALL_FOR_NOW:
630
case AVAHI_BROWSER_CACHE_EXHAUSTED:
631
break;
632
}
633
}
634
635
/* Combines file name and path and returns the malloced new
636
string. some sane checks could/should be added */
637
static const char *combinepath(const char *first, const char *second){
638
size_t f_len = strlen(first);
639
size_t s_len = strlen(second);
640
char *tmp = malloc(f_len + s_len + 2);
641
if (tmp == NULL){
642
return NULL;
643
}
644
if(f_len > 0){
645
memcpy(tmp, first, f_len);
646
}
647
tmp[f_len] = '/';
648
if(s_len > 0){
649
memcpy(tmp + f_len + 1, second, s_len);
650
}
651
tmp[f_len + 1 + s_len] = '\0';
652
return tmp;
653
}
654
655
656
int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
2149
657
AvahiServerConfig config;
2150
/* Do not publish any local Zeroconf records */
658
AvahiSServiceBrowser *sb = NULL;
659
int error;
660
int ret;
661
int debug_int = 0;
662
int returncode = EXIT_SUCCESS;
663
const char *interface = NULL;
664
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
665
char *connect_to = NULL;
666
667
debug_int = debug ? 1 : 0;
668
while (true){
669
static struct option long_options[] = {
670
{"debug", no_argument, &debug_int, 1},
671
{"connect", required_argument, NULL, 'C'},
672
{"interface", required_argument, NULL, 'i'},
673
{"keydir", required_argument, NULL, 'd'},
674
{"seckey", required_argument, NULL, 'c'},
675
{"pubkey", required_argument, NULL, 'k'},
676
{"dh-bits", required_argument, NULL, 'D'},
677
{0, 0, 0, 0} };
678
679
int option_index = 0;
680
ret = getopt_long (argc, argv, "i:", long_options,
681
&option_index);
682
683
if (ret == -1){
684
break;
685
}
686
687
switch(ret){
688
case 0:
689
break;
690
case 'i':
691
interface = optarg;
692
break;
693
case 'C':
694
connect_to = optarg;
695
break;
696
case 'd':
697
keydir = optarg;
698
break;
699
case 'c':
700
pubkeyfile = optarg;
701
break;
702
case 'k':
703
seckeyfile = optarg;
704
break;
705
case 'D':
706
dh_bits = atoi(optarg);
707
break;
708
case '?':
709
break
710
default:
711
exit(EXIT_FAILURE);
712
}
713
}
714
debug = debug_int ? true : false;
715
716
pubkeyfile = combinepath(keydir, pubkeyfile);
717
if (pubkeyfile == NULL){
718
perror("combinepath");
719
goto exit;
720
}
721
722
if(interface != NULL){
723
if_index = (AvahiIfIndex) if_nametoindex(interface);
724
if(if_index == 0){
725
fprintf(stderr, "No such interface: \"%s\"\n", interface);
726
exit(EXIT_FAILURE);
727
}
728
}
729
730
if(connect_to != NULL){
731
/* Connect directly, do not use Zeroconf */
732
/* (Mainly meant for debugging) */
733
char *address = strrchr(connect_to, ':');
734
if(address == NULL){
735
fprintf(stderr, "No colon in address\n");
736
exit(EXIT_FAILURE);
737
}
738
errno = 0;
739
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
740
if(errno){
741
perror("Bad port number");
742
exit(EXIT_FAILURE);
743
}
744
*address = '\0';
745
address = connect_to;
746
ret = start_mandos_communication(address, port, if_index);
747
if(ret < 0){
748
exit(EXIT_FAILURE);
749
} else {
750
exit(EXIT_SUCCESS);
751
}
752
}
753
754
seckeyfile = combinepath(keydir, seckeyfile);
755
if (seckeyfile == NULL){
756
perror("combinepath");
757
goto exit;
758
}
759
760
if (not debug){
761
avahi_set_log_function(empty_log);
762
}
763
764
/* Initialize the psuedo-RNG */
765
srand((unsigned int) time(NULL));
766
767
/* Allocate main loop object */
768
if (!(simple_poll = avahi_simple_poll_new())) {
769
fprintf(stderr, "Failed to create simple poll object.\n");
770
771
goto exit;
772
}
773
774
/* Do not publish any local records */
2151
775
avahi_server_config_init(&config);
2152
776
config.publish_hinfo = 0;
2153
777
config.publish_addresses = 0;
2154
778
config.publish_workstation = 0;
2155
779
config.publish_domain = 0;
2156
780
2157
781
/* Allocate a new server */
2158
mc.server = avahi_server_new(avahi_simple_poll_get
2159
(mc.simple_poll), &config, NULL,
2160
NULL, &error);
2161
2162
/* Free the Avahi configuration data */
782
server = avahi_server_new(avahi_simple_poll_get(simple_poll),
783
&config, NULL, NULL, &error);
784
785
/* Free the configuration data */
2163
786
avahi_server_config_free(&config);
2164
}
2165
2166
/* Check if creating the Avahi server object succeeded */
2167
if(mc.server == NULL){
2168
fprintf(stderr, "Mandos plugin mandos-client: "
2169
"Failed to create Avahi server: %s\n",
2170
avahi_strerror(error));
2171
exitcode = EX_UNAVAILABLE;
2172
goto end;
2173
}
2174
2175
if(quit_now){
2176
goto end;
2177
}
2178
2179
/* Create the Avahi service browser */
2180
sb = avahi_s_service_browser_new(mc.server, if_index,
2181
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2182
NULL, 0, browse_callback, NULL);
2183
if(sb == NULL){
2184
fprintf(stderr, "Mandos plugin mandos-client: "
2185
"Failed to create service browser: %s\n",
2186
avahi_strerror(avahi_server_errno(mc.server)));
2187
exitcode = EX_UNAVAILABLE;
2188
goto end;
2189
}
2190
2191
if(quit_now){
2192
goto end;
2193
}
2194
2195
/* Run the main loop */
2196
2197
if(debug){
2198
fprintf(stderr, "Mandos plugin mandos-client: "
2199
"Starting Avahi loop search\n");
2200
}
2201
2202
ret = avahi_loop_with_timeout(mc.simple_poll,
2203
(int)(retry_interval * 1000));
2204
if(debug){
2205
fprintf(stderr, "Mandos plugin mandos-client: "
2206
"avahi_loop_with_timeout exited %s\n",
2207
(ret == 0) ? "successfully" : "with error");
2208
}
2209
2210
end:
2211
2212
if(debug){
2213
fprintf(stderr, "Mandos plugin mandos-client: "
2214
"%s exiting\n", argv[0]);
2215
}
2216
2217
/* Cleanup things */
2218
if(sb != NULL)
2219
avahi_s_service_browser_free(sb);
2220
2221
if(mc.server != NULL)
2222
avahi_server_free(mc.server);
2223
2224
if(mc.simple_poll != NULL)
2225
avahi_simple_poll_free(mc.simple_poll);
2226
2227
if(gnutls_initialized){
2228
gnutls_certificate_free_credentials(mc.cred);
2229
gnutls_global_deinit();
2230
gnutls_dh_params_deinit(mc.dh_params);
2231
}
2232
2233
if(gpgme_initialized){
2234
gpgme_release(mc.ctx);
2235
}
2236
2237
/* Cleans up the circular linked list of Mandos servers the client
2238
has seen */
2239
if(mc.current_server != NULL){
2240
mc.current_server->prev->next = NULL;
2241
while(mc.current_server != NULL){
2242
server *next = mc.current_server->next;
2243
free(mc.current_server);
2244
mc.current_server = next;
2245
}
2246
}
2247
2248
/* XXX run network hooks "stop" here */
2249
2250
/* Take down the network interface */
2251
if(take_down_interface){
2252
/* Re-raise priviliges */
2253
errno = 0;
2254
ret = seteuid(0);
2255
if(ret == -1){
2256
perror_plus("seteuid");
2257
}
2258
if(geteuid() == 0){
2259
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2260
if(ret == -1){
2261
perror_plus("ioctl SIOCGIFFLAGS");
2262
} else if(network.ifr_flags & IFF_UP){
2263
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2264
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2265
if(ret == -1){
2266
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2267
}
2268
}
2269
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2270
if(ret == -1){
2271
perror_plus("close");
2272
}
2273
/* Lower privileges permanently */
2274
errno = 0;
2275
ret = setuid(uid);
2276
if(ret == -1){
2277
perror_plus("setuid");
2278
}
2279
}
2280
}
2281
2282
/* Removes the GPGME temp directory and all files inside */
2283
if(tempdir_created){
2284
struct dirent **direntries = NULL;
2285
struct dirent *direntry = NULL;
2286
int numentries = scandir(tempdir, &direntries, notdotentries,
2287
alphasort);
2288
if (numentries > 0){
2289
for(int i = 0; i < numentries; i++){
2290
direntry = direntries[i];
2291
char *fullname = NULL;
2292
ret = asprintf(&fullname, "%s/%s", tempdir,
2293
direntry->d_name);
2294
if(ret < 0){
2295
perror_plus("asprintf");
2296
continue;
2297
}
2298
ret = remove(fullname);
2299
if(ret == -1){
2300
fprintf(stderr, "Mandos plugin mandos-client: "
2301
"remove(\"%s\"): %s\n", fullname, strerror(errno));
2302
}
2303
free(fullname);
2304
}
2305
}
2306
2307
/* need to clean even if 0 because man page doesn't specify */
2308
free(direntries);
2309
if (numentries == -1){
2310
perror_plus("scandir");
2311
}
2312
ret = rmdir(tempdir);
2313
if(ret == -1 and errno != ENOENT){
2314
perror_plus("rmdir");
2315
}
2316
}
2317
2318
if(quit_now){
2319
sigemptyset(&old_sigterm_action.sa_mask);
2320
old_sigterm_action.sa_handler = SIG_DFL;
2321
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2322
&old_sigterm_action,
2323
NULL));
2324
if(ret == -1){
2325
perror_plus("sigaction");
2326
}
2327
do {
2328
ret = raise(signal_received);
2329
} while(ret != 0 and errno == EINTR);
2330
if(ret != 0){
2331
perror_plus("raise");
2332
abort();
2333
}
2334
TEMP_FAILURE_RETRY(pause());
2335
}
2336
2337
return exitcode;
787
788
/* Check if creating the server object succeeded */
789
if (!server) {
790
fprintf(stderr, "Failed to create server: %s\n",
791
avahi_strerror(error));
792
returncode = EXIT_FAILURE;
793
goto exit;
794
}
795
796
/* Create the service browser */
797
sb = avahi_s_service_browser_new(server, if_index,
798
AVAHI_PROTO_INET6,
799
"_mandos._tcp", NULL, 0,
800
browse_callback, server);
801
if (!sb) {
802
fprintf(stderr, "Failed to create service browser: %s\n",
803
avahi_strerror(avahi_server_errno(server)));
804
returncode = EXIT_FAILURE;
805
goto exit;
806
}
807
808
/* Run the main loop */
809
810
if (debug){
811
fprintf(stderr, "Starting avahi loop search\n");
812
}
813
814
avahi_simple_poll_loop(simple_poll);
815
816
exit:
817
818
if (debug){
819
fprintf(stderr, "%s exiting\n", argv[0]);
820
}
821
822
/* Cleanup things */
823
if (sb)
824
avahi_s_service_browser_free(sb);
825
826
if (server)
827
avahi_server_free(server);
828
829
if (simple_poll)
830
avahi_simple_poll_free(simple_poll);
831
free(pubkeyfile);
832
free(seckeyfile);
833
834
return returncode;
2338
835
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0