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- Committer: teddy at bsnet
- Date: 2011-11-12 16:24:19 UTC
- mto: (505.2.5 mandos-client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 525.
- Revision ID: teddy@fukt.bsnet.se-20111112162419-pe83skogsctxuzw7
* plugins.d/mandos-client.c: Prefix all printouts with "Mandos plugin
mandos-client: ".
* plugins.d/mandos-client.c (main): Wait for network hooks and check
the completion status.
mandos-client: ".
* plugins.d/mandos-client.c (main): Wait for network hooks and check
the completion status.
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- files removed:
- ca.pem
- files renamed:
- server.py => mandos
- server.conf => mandos.conf
- plugbasedclient.c => plugin-runner.c
- plugins.d/mandosclient.c => plugins.d/mandos-client.c
- plugins.d/passprompt.c => plugins.d/password-prompt.c
- files modified:
- Makefile
added
removed
plugins.d/mandos-client.c
1
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
* Mandos client - get and decrypt data from a Mandos server
3
* Mandos-client - get and decrypt data from a Mandos server
4
4
*
5
5
* This program is partly derived from an example program for an Avahi
6
6
* service browser, downloaded from
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
13
14
*
14
15
* This program is free software: you can redistribute it and/or
15
16
* modify it under the terms of the GNU General Public License as
25
26
* along with this program. If not, see
26
27
* <http://www.gnu.org/licenses/>.
27
28
*
28
* Contact the authors at <mandos@fukt.bsnet.se>.
29
* Contact the authors at <mandos@recompile.se>.
29
30
*/
30
31
31
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
32
34
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
33
37
#define _FILE_OFFSET_BITS 64
34
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
36
37
#include <stdio.h>
38
#include <assert.h>
39
#include <stdlib.h>
40
#include <time.h>
41
#include <net/if.h> /* if_nametoindex */
42
#include <sys/ioctl.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
43
SIOCSIFFLAGS */
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() */
44
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
45
SIOCSIFFLAGS */
46
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_* */
47
99
#include <avahi-core/core.h>
48
100
#include <avahi-core/lookup.h>
49
101
#include <avahi-core/log.h>
51
103
#include <avahi-common/malloc.h>
52
104
#include <avahi-common/error.h>
53
105
54
/* Mandos client part */
55
#include <sys/types.h> /* socket(), inet_pton() */
56
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
57
struct in6_addr, inet_pton() */
58
#include <gnutls/gnutls.h> /* All GnuTLS stuff */
59
#include <gnutls/openpgp.h> /* GnuTLS with openpgp stuff */
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 */
60
115
61
#include <unistd.h> /* close() */
62
#include <netinet/in.h>
63
#include <stdbool.h> /* true */
64
#include <string.h> /* memset */
65
#include <arpa/inet.h> /* inet_pton() */
66
#include <iso646.h> /* not */
67
#include <net/if.h> /* IF_NAMESIZE */
68
#include <argp.h> /* struct argp_option,
69
struct argp_state, struct argp,
70
argp_parse() */
71
116
/* GPGME */
72
#include <errno.h> /* perror() */
73
#include <gpgme.h>
117
#include <gpgme.h> /* All GPGME types, constants and
118
functions:
119
gpgme_*
120
GPGME_PROTOCOL_OpenPGP,
121
GPG_ERR_NO_* */
74
122
75
123
#define BUFFER_SIZE 256
76
124
125
#define PATHDIR "/conf/conf.d/mandos"
126
#define SECKEY "seckey.txt"
127
#define PUBKEY "pubkey.txt"
128
#define HOOKDIR "/lib/mandos/network-hooks.d"
129
77
130
bool debug = false;
78
static const char *keydir = "/conf/conf.d/mandos";
79
const char *argp_program_version = "mandosclient 0.9";
80
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
81
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
137
/* Doubly linked list that need to be circularly linked when used */
138
typedef struct server{
139
const char *ip;
140
uint16_t port;
141
AvahiIfIndex if_index;
142
int af;
143
struct timespec last_seen;
144
struct server *next;
145
struct server *prev;
146
} server;
82
147
83
148
/* Used for passing in values through the Avahi callback functions */
84
149
typedef struct {
88
153
unsigned int dh_bits;
89
154
gnutls_dh_params_t dh_params;
90
155
const char *priority;
156
gpgme_ctx_t ctx;
157
server *current_server;
91
158
} mandos_context;
92
159
93
/* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
94
* "buffer_capacity" is how much is currently allocated,
95
* "buffer_length" is how much is already used. */
96
size_t adjustbuffer(char **buffer, size_t buffer_length,
160
/* global context so signal handler can reach it*/
161
mandos_context mc = { .simple_poll = NULL, .server = NULL,
162
.dh_bits = 1024, .priority = "SECURE256"
163
":!CTYPE-X.509:+CTYPE-OPENPGP",
164
.current_server = NULL };
165
166
sig_atomic_t quit_now = 0;
167
int signal_received = 0;
168
169
/* Function to use when printing errors */
170
void perror_plus(const char *print_text){
171
fprintf(stderr, "Mandos plugin %s: ",
172
program_invocation_short_name);
173
perror(print_text);
174
}
175
176
/*
177
* Make additional room in "buffer" for at least BUFFER_SIZE more
178
* bytes. "buffer_capacity" is how much is currently allocated,
179
* "buffer_length" is how much is already used.
180
*/
181
size_t incbuffer(char **buffer, size_t buffer_length,
97
182
size_t buffer_capacity){
98
if (buffer_length + BUFFER_SIZE > buffer_capacity){
183
if(buffer_length + BUFFER_SIZE > buffer_capacity){
99
184
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
100
if (buffer == NULL){
185
if(buffer == NULL){
101
186
return 0;
102
187
}
103
188
buffer_capacity += BUFFER_SIZE;
105
190
return buffer_capacity;
106
191
}
107
192
193
/* Add server to set of servers to retry periodically */
194
int add_server(const char *ip, uint16_t port,
195
AvahiIfIndex if_index,
196
int af){
197
int ret;
198
server *new_server = malloc(sizeof(server));
199
if(new_server == NULL){
200
perror_plus("malloc");
201
return -1;
202
}
203
*new_server = (server){ .ip = strdup(ip),
204
.port = port,
205
.if_index = if_index,
206
.af = af };
207
if(new_server->ip == NULL){
208
perror_plus("strdup");
209
return -1;
210
}
211
/* Special case of first server */
212
if (mc.current_server == NULL){
213
new_server->next = new_server;
214
new_server->prev = new_server;
215
mc.current_server = new_server;
216
/* Place the new server last in the list */
217
} else {
218
new_server->next = mc.current_server;
219
new_server->prev = mc.current_server->prev;
220
new_server->prev->next = new_server;
221
mc.current_server->prev = new_server;
222
}
223
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
224
if(ret == -1){
225
perror_plus("clock_gettime");
226
return -1;
227
}
228
return 0;
229
}
230
108
231
/*
109
* Decrypt OpenPGP data using keyrings in HOMEDIR.
110
* Returns -1 on error
232
* Initialize GPGME.
111
233
*/
112
static ssize_t pgp_packet_decrypt (const char *cryptotext,
113
size_t crypto_size,
114
char **plaintext,
115
const char *homedir){
116
gpgme_data_t dh_crypto, dh_plain;
117
gpgme_ctx_t ctx;
234
static bool init_gpgme(const char *seckey,
235
const char *pubkey, const char *tempdir){
118
236
gpgme_error_t rc;
119
ssize_t ret;
120
size_t plaintext_capacity = 0;
121
ssize_t plaintext_length = 0;
122
237
gpgme_engine_info_t engine_info;
123
238
124
if (debug){
125
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
239
240
/*
241
* Helper function to insert pub and seckey to the engine keyring.
242
*/
243
bool import_key(const char *filename){
244
int ret;
245
int fd;
246
gpgme_data_t pgp_data;
247
248
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
249
if(fd == -1){
250
perror_plus("open");
251
return false;
252
}
253
254
rc = gpgme_data_new_from_fd(&pgp_data, fd);
255
if(rc != GPG_ERR_NO_ERROR){
256
fprintf(stderr, "Mandos plugin mandos-client: "
257
"bad gpgme_data_new_from_fd: %s: %s\n",
258
gpgme_strsource(rc), gpgme_strerror(rc));
259
return false;
260
}
261
262
rc = gpgme_op_import(mc.ctx, pgp_data);
263
if(rc != GPG_ERR_NO_ERROR){
264
fprintf(stderr, "Mandos plugin mandos-client: "
265
"bad gpgme_op_import: %s: %s\n",
266
gpgme_strsource(rc), gpgme_strerror(rc));
267
return false;
268
}
269
270
ret = (int)TEMP_FAILURE_RETRY(close(fd));
271
if(ret == -1){
272
perror_plus("close");
273
}
274
gpgme_data_release(pgp_data);
275
return true;
276
}
277
278
if(debug){
279
fprintf(stderr, "Mandos plugin mandos-client: "
280
"Initializing GPGME\n");
126
281
}
127
282
128
283
/* Init GPGME */
129
284
gpgme_check_version(NULL);
130
285
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
131
if (rc != GPG_ERR_NO_ERROR){
132
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
286
if(rc != GPG_ERR_NO_ERROR){
287
fprintf(stderr, "Mandos plugin mandos-client: "
288
"bad gpgme_engine_check_version: %s: %s\n",
133
289
gpgme_strsource(rc), gpgme_strerror(rc));
134
return -1;
290
return false;
135
291
}
136
292
137
293
/* Set GPGME home directory for the OpenPGP engine only */
138
rc = gpgme_get_engine_info (&engine_info);
139
if (rc != GPG_ERR_NO_ERROR){
140
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
294
rc = gpgme_get_engine_info(&engine_info);
295
if(rc != GPG_ERR_NO_ERROR){
296
fprintf(stderr, "Mandos plugin mandos-client: "
297
"bad gpgme_get_engine_info: %s: %s\n",
141
298
gpgme_strsource(rc), gpgme_strerror(rc));
142
return -1;
299
return false;
143
300
}
144
301
while(engine_info != NULL){
145
302
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
146
303
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
147
engine_info->file_name, homedir);
304
engine_info->file_name, tempdir);
148
305
break;
149
306
}
150
307
engine_info = engine_info->next;
151
308
}
152
309
if(engine_info == NULL){
153
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
154
return -1;
310
fprintf(stderr, "Mandos plugin mandos-client: "
311
"Could not set GPGME home dir to %s\n", tempdir);
312
return false;
313
}
314
315
/* Create new GPGME "context" */
316
rc = gpgme_new(&(mc.ctx));
317
if(rc != GPG_ERR_NO_ERROR){
318
fprintf(stderr, "Mandos plugin mandos-client: "
319
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
320
gpgme_strerror(rc));
321
return false;
322
}
323
324
if(not import_key(pubkey) or not import_key(seckey)){
325
return false;
326
}
327
328
return true;
329
}
330
331
/*
332
* Decrypt OpenPGP data.
333
* Returns -1 on error
334
*/
335
static ssize_t pgp_packet_decrypt(const char *cryptotext,
336
size_t crypto_size,
337
char **plaintext){
338
gpgme_data_t dh_crypto, dh_plain;
339
gpgme_error_t rc;
340
ssize_t ret;
341
size_t plaintext_capacity = 0;
342
ssize_t plaintext_length = 0;
343
344
if(debug){
345
fprintf(stderr, "Mandos plugin mandos-client: "
346
"Trying to decrypt OpenPGP data\n");
155
347
}
156
348
157
349
/* Create new GPGME data buffer from memory cryptotext */
158
350
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
159
351
0);
160
if (rc != GPG_ERR_NO_ERROR){
161
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
352
if(rc != GPG_ERR_NO_ERROR){
353
fprintf(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_data_new_from_mem: %s: %s\n",
162
355
gpgme_strsource(rc), gpgme_strerror(rc));
163
356
return -1;
164
357
}
165
358
166
359
/* Create new empty GPGME data buffer for the plaintext */
167
360
rc = gpgme_data_new(&dh_plain);
168
if (rc != GPG_ERR_NO_ERROR){
169
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
361
if(rc != GPG_ERR_NO_ERROR){
362
fprintf(stderr, "Mandos plugin mandos-client: "
363
"bad gpgme_data_new: %s: %s\n",
170
364
gpgme_strsource(rc), gpgme_strerror(rc));
171
365
gpgme_data_release(dh_crypto);
172
366
return -1;
173
367
}
174
368
175
/* Create new GPGME "context" */
176
rc = gpgme_new(&ctx);
177
if (rc != GPG_ERR_NO_ERROR){
178
fprintf(stderr, "bad gpgme_new: %s: %s\n",
179
gpgme_strsource(rc), gpgme_strerror(rc));
180
plaintext_length = -1;
181
goto decrypt_end;
182
}
183
184
369
/* Decrypt data from the cryptotext data buffer to the plaintext
185
370
data buffer */
186
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
187
if (rc != GPG_ERR_NO_ERROR){
188
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
371
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
372
if(rc != GPG_ERR_NO_ERROR){
373
fprintf(stderr, "Mandos plugin mandos-client: "
374
"bad gpgme_op_decrypt: %s: %s\n",
189
375
gpgme_strsource(rc), gpgme_strerror(rc));
190
376
plaintext_length = -1;
191
goto decrypt_end;
192
}
193
194
if(debug){
195
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
196
}
197
198
if (debug){
199
gpgme_decrypt_result_t result;
200
result = gpgme_op_decrypt_result(ctx);
201
if (result == NULL){
202
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
203
} else {
204
fprintf(stderr, "Unsupported algorithm: %s\n",
205
result->unsupported_algorithm);
206
fprintf(stderr, "Wrong key usage: %d\n",
207
result->wrong_key_usage);
208
if(result->file_name != NULL){
209
fprintf(stderr, "File name: %s\n", result->file_name);
210
}
211
gpgme_recipient_t recipient;
212
recipient = result->recipients;
213
if(recipient){
377
if(debug){
378
gpgme_decrypt_result_t result;
379
result = gpgme_op_decrypt_result(mc.ctx);
380
if(result == NULL){
381
fprintf(stderr, "Mandos plugin mandos-client: "
382
"gpgme_op_decrypt_result failed\n");
383
} else {
384
fprintf(stderr, "Mandos plugin mandos-client: "
385
"Unsupported algorithm: %s\n",
386
result->unsupported_algorithm);
387
fprintf(stderr, "Mandos plugin mandos-client: "
388
"Wrong key usage: %u\n",
389
result->wrong_key_usage);
390
if(result->file_name != NULL){
391
fprintf(stderr, "Mandos plugin mandos-client: "
392
"File name: %s\n", result->file_name);
393
}
394
gpgme_recipient_t recipient;
395
recipient = result->recipients;
214
396
while(recipient != NULL){
215
fprintf(stderr, "Public key algorithm: %s\n",
397
fprintf(stderr, "Mandos plugin mandos-client: "
398
"Public key algorithm: %s\n",
216
399
gpgme_pubkey_algo_name(recipient->pubkey_algo));
217
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
218
fprintf(stderr, "Secret key available: %s\n",
400
fprintf(stderr, "Mandos plugin mandos-client: "
401
"Key ID: %s\n", recipient->keyid);
402
fprintf(stderr, "Mandos plugin mandos-client: "
403
"Secret key available: %s\n",
219
404
recipient->status == GPG_ERR_NO_SECKEY
220
405
? "No" : "Yes");
221
406
recipient = recipient->next;
222
407
}
223
408
}
224
409
}
410
goto decrypt_end;
411
}
412
413
if(debug){
414
fprintf(stderr, "Mandos plugin mandos-client: "
415
"Decryption of OpenPGP data succeeded\n");
225
416
}
226
417
227
418
/* Seek back to the beginning of the GPGME plaintext data buffer */
228
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
229
perror("pgpme_data_seek");
419
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
420
perror_plus("gpgme_data_seek");
230
421
plaintext_length = -1;
231
422
goto decrypt_end;
232
423
}
233
424
234
425
*plaintext = NULL;
235
426
while(true){
236
plaintext_capacity = adjustbuffer(plaintext,
427
plaintext_capacity = incbuffer(plaintext,
237
428
(size_t)plaintext_length,
238
429
plaintext_capacity);
239
if (plaintext_capacity == 0){
240
perror("adjustbuffer");
430
if(plaintext_capacity == 0){
431
perror_plus("incbuffer");
241
432
plaintext_length = -1;
242
433
goto decrypt_end;
243
434
}
245
436
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
246
437
BUFFER_SIZE);
247
438
/* Print the data, if any */
248
if (ret == 0){
439
if(ret == 0){
249
440
/* EOF */
250
441
break;
251
442
}
252
443
if(ret < 0){
253
perror("gpgme_data_read");
444
perror_plus("gpgme_data_read");
254
445
plaintext_length = -1;
255
446
goto decrypt_end;
256
447
}
257
448
plaintext_length += ret;
258
449
}
259
450
260
451
if(debug){
261
fprintf(stderr, "Decrypted password is: ");
452
fprintf(stderr, "Mandos plugin mandos-client: "
453
"Decrypted password is: ");
262
454
for(ssize_t i = 0; i < plaintext_length; i++){
263
455
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
264
456
}
275
467
return plaintext_length;
276
468
}
277
469
278
static const char * safer_gnutls_strerror (int value) {
279
const char *ret = gnutls_strerror (value);
280
if (ret == NULL)
470
static const char * safer_gnutls_strerror(int value){
471
const char *ret = gnutls_strerror(value); /* Spurious warning from
472
-Wunreachable-code */
473
if(ret == NULL)
281
474
ret = "(unknown)";
282
475
return ret;
283
476
}
285
478
/* GnuTLS log function callback */
286
479
static void debuggnutls(__attribute__((unused)) int level,
287
480
const char* string){
288
fprintf(stderr, "GnuTLS: %s", string);
481
fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);
289
482
}
290
483
291
static int init_gnutls_global(mandos_context *mc,
292
const char *pubkeyfile,
293
const char *seckeyfile){
484
static int init_gnutls_global(const char *pubkeyfilename,
485
const char *seckeyfilename){
294
486
int ret;
295
487
296
488
if(debug){
297
fprintf(stderr, "Initializing GnuTLS\n");
489
fprintf(stderr, "Mandos plugin mandos-client: "
490
"Initializing GnuTLS\n");
298
491
}
299
300
if ((ret = gnutls_global_init ())
301
!= GNUTLS_E_SUCCESS) {
302
fprintf (stderr, "GnuTLS global_init: %s\n",
303
safer_gnutls_strerror(ret));
492
493
ret = gnutls_global_init();
494
if(ret != GNUTLS_E_SUCCESS){
495
fprintf(stderr, "Mandos plugin mandos-client: "
496
"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
304
497
return -1;
305
498
}
306
499
307
if (debug){
500
if(debug){
308
501
/* "Use a log level over 10 to enable all debugging options."
309
502
* - GnuTLS manual
310
503
*/
313
506
}
314
507
315
508
/* OpenPGP credentials */
316
if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))
317
!= GNUTLS_E_SUCCESS) {
318
fprintf (stderr, "GnuTLS memory error: %s\n",
319
safer_gnutls_strerror(ret));
509
ret = gnutls_certificate_allocate_credentials(&mc.cred);
510
if(ret != GNUTLS_E_SUCCESS){
511
fprintf(stderr, "Mandos plugin mandos-client: "
512
"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
513
gnutls_global_deinit();
320
514
return -1;
321
515
}
322
516
323
517
if(debug){
324
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
325
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
326
seckeyfile);
518
fprintf(stderr, "Mandos plugin mandos-client: "
519
"Attempting to use OpenPGP public key %s and"
520
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
521
seckeyfilename);
327
522
}
328
523
329
524
ret = gnutls_certificate_set_openpgp_key_file
330
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
331
if (ret != GNUTLS_E_SUCCESS) {
525
(mc.cred, pubkeyfilename, seckeyfilename,
526
GNUTLS_OPENPGP_FMT_BASE64);
527
if(ret != GNUTLS_E_SUCCESS){
332
528
fprintf(stderr,
529
"Mandos plugin mandos-client: "
333
530
"Error[%d] while reading the OpenPGP key pair ('%s',"
334
" '%s')\n", ret, pubkeyfile, seckeyfile);
335
fprintf(stdout, "The GnuTLS error is: %s\n",
336
safer_gnutls_strerror(ret));
337
return -1;
531
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
532
fprintf(stderr, "Mandos plugin mandos-client: "
533
"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));
534
goto globalfail;
338
535
}
339
536
340
537
/* GnuTLS server initialization */
341
ret = gnutls_dh_params_init(&mc->dh_params);
342
if (ret != GNUTLS_E_SUCCESS) {
343
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
344
" %s\n", safer_gnutls_strerror(ret));
345
return -1;
346
}
347
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
348
if (ret != GNUTLS_E_SUCCESS) {
349
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
350
safer_gnutls_strerror(ret));
351
return -1;
352
}
353
354
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
355
538
ret = gnutls_dh_params_init(&mc.dh_params);
539
if(ret != GNUTLS_E_SUCCESS){
540
fprintf(stderr, "Mandos plugin mandos-client: "
541
"Error in GnuTLS DH parameter initialization:"
542
" %s\n", safer_gnutls_strerror(ret));
543
goto globalfail;
544
}
545
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
546
if(ret != GNUTLS_E_SUCCESS){
547
fprintf(stderr, "Mandos plugin mandos-client: "
548
"Error in GnuTLS prime generation: %s\n",
549
safer_gnutls_strerror(ret));
550
goto globalfail;
551
}
552
553
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
554
356
555
return 0;
556
557
globalfail:
558
559
gnutls_certificate_free_credentials(mc.cred);
560
gnutls_global_deinit();
561
gnutls_dh_params_deinit(mc.dh_params);
562
return -1;
357
563
}
358
564
359
static int init_gnutls_session(mandos_context *mc,
360
gnutls_session_t *session){
565
static int init_gnutls_session(gnutls_session_t *session){
361
566
int ret;
362
567
/* GnuTLS session creation */
363
ret = gnutls_init(session, GNUTLS_SERVER);
364
if (ret != GNUTLS_E_SUCCESS){
365
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
568
do {
569
ret = gnutls_init(session, GNUTLS_SERVER);
570
if(quit_now){
571
return -1;
572
}
573
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
574
if(ret != GNUTLS_E_SUCCESS){
575
fprintf(stderr, "Mandos plugin mandos-client: "
576
"Error in GnuTLS session initialization: %s\n",
366
577
safer_gnutls_strerror(ret));
367
578
}
368
579
369
580
{
370
581
const char *err;
371
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
372
if (ret != GNUTLS_E_SUCCESS) {
373
fprintf(stderr, "Syntax error at: %s\n", err);
374
fprintf(stderr, "GnuTLS error: %s\n",
375
safer_gnutls_strerror(ret));
582
do {
583
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
584
if(quit_now){
585
gnutls_deinit(*session);
586
return -1;
587
}
588
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
589
if(ret != GNUTLS_E_SUCCESS){
590
fprintf(stderr, "Mandos plugin mandos-client: "
591
"Syntax error at: %s\n", err);
592
fprintf(stderr, "Mandos plugin mandos-client: "
593
"GnuTLS error: %s\n", safer_gnutls_strerror(ret));
594
gnutls_deinit(*session);
376
595
return -1;
377
596
}
378
597
}
379
598
380
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
381
mc->cred);
382
if (ret != GNUTLS_E_SUCCESS) {
383
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
599
do {
600
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
601
mc.cred);
602
if(quit_now){
603
gnutls_deinit(*session);
604
return -1;
605
}
606
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
607
if(ret != GNUTLS_E_SUCCESS){
608
fprintf(stderr, "Mandos plugin mandos-client: "
609
"Error setting GnuTLS credentials: %s\n",
384
610
safer_gnutls_strerror(ret));
611
gnutls_deinit(*session);
385
612
return -1;
386
613
}
387
614
388
615
/* ignore client certificate if any. */
389
gnutls_certificate_server_set_request (*session,
390
GNUTLS_CERT_IGNORE);
616
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
391
617
392
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
618
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
393
619
394
620
return 0;
395
621
}
401
627
/* Called when a Mandos server is found */
402
628
static int start_mandos_communication(const char *ip, uint16_t port,
403
629
AvahiIfIndex if_index,
404
mandos_context *mc){
405
int ret, tcp_sd;
406
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
630
int af){
631
int ret, tcp_sd = -1;
632
ssize_t sret;
633
union {
634
struct sockaddr_in in;
635
struct sockaddr_in6 in6;
636
} to;
407
637
char *buffer = NULL;
408
char *decrypted_buffer;
638
char *decrypted_buffer = NULL;
409
639
size_t buffer_length = 0;
410
640
size_t buffer_capacity = 0;
411
ssize_t decrypted_buffer_size;
412
641
size_t written;
413
int retval = 0;
414
char interface[IF_NAMESIZE];
642
int retval = -1;
415
643
gnutls_session_t session;
416
417
ret = init_gnutls_session (mc, &session);
418
if (ret != 0){
419
return -1;
420
}
421
422
if(debug){
423
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
424
ip, port);
425
}
426
427
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
428
if(tcp_sd < 0) {
429
perror("socket");
430
return -1;
431
}
432
433
if(debug){
434
if(if_indextoname((unsigned int)if_index, interface) == NULL){
435
perror("if_indextoname");
436
return -1;
437
}
438
fprintf(stderr, "Binding to interface %s\n", interface);
439
}
440
441
memset(&to,0,sizeof(to)); /* Spurious warning */
442
to.in6.sin6_family = AF_INET6;
443
/* It would be nice to have a way to detect if we were passed an
444
IPv4 address here. Now we assume an IPv6 address. */
445
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
446
if (ret < 0 ){
447
perror("inet_pton");
448
return -1;
644
int pf; /* Protocol family */
645
646
errno = 0;
647
648
if(quit_now){
649
errno = EINTR;
650
return -1;
651
}
652
653
switch(af){
654
case AF_INET6:
655
pf = PF_INET6;
656
break;
657
case AF_INET:
658
pf = PF_INET;
659
break;
660
default:
661
fprintf(stderr, "Mandos plugin mandos-client: "
662
"Bad address family: %d\n", af);
663
errno = EINVAL;
664
return -1;
665
}
666
667
ret = init_gnutls_session(&session);
668
if(ret != 0){
669
return -1;
670
}
671
672
if(debug){
673
fprintf(stderr, "Mandos plugin mandos-client: "
674
"Setting up a TCP connection to %s, port %" PRIu16
675
"\n", ip, port);
676
}
677
678
tcp_sd = socket(pf, SOCK_STREAM, 0);
679
if(tcp_sd < 0){
680
int e = errno;
681
perror_plus("socket");
682
errno = e;
683
goto mandos_end;
684
}
685
686
if(quit_now){
687
errno = EINTR;
688
goto mandos_end;
689
}
690
691
memset(&to, 0, sizeof(to));
692
if(af == AF_INET6){
693
to.in6.sin6_family = (sa_family_t)af;
694
ret = inet_pton(af, ip, &to.in6.sin6_addr);
695
} else { /* IPv4 */
696
to.in.sin_family = (sa_family_t)af;
697
ret = inet_pton(af, ip, &to.in.sin_addr);
698
}
699
if(ret < 0 ){
700
int e = errno;
701
perror_plus("inet_pton");
702
errno = e;
703
goto mandos_end;
449
704
}
450
705
if(ret == 0){
451
fprintf(stderr, "Bad address: %s\n", ip);
452
return -1;
453
}
454
to.in6.sin6_port = htons(port); /* Spurious warning */
706
int e = errno;
707
fprintf(stderr, "Mandos plugin mandos-client: "
708
"Bad address: %s\n", ip);
709
errno = e;
710
goto mandos_end;
711
}
712
if(af == AF_INET6){
713
to.in6.sin6_port = htons(port); /* Spurious warnings from
714
-Wconversion and
715
-Wunreachable-code */
716
717
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
718
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
719
-Wunreachable-code*/
720
if(if_index == AVAHI_IF_UNSPEC){
721
fprintf(stderr, "Mandos plugin mandos-client: "
722
"An IPv6 link-local address is incomplete"
723
" without a network interface\n");
724
errno = EINVAL;
725
goto mandos_end;
726
}
727
/* Set the network interface number as scope */
728
to.in6.sin6_scope_id = (uint32_t)if_index;
729
}
730
} else {
731
to.in.sin_port = htons(port); /* Spurious warnings from
732
-Wconversion and
733
-Wunreachable-code */
734
}
455
735
456
to.in6.sin6_scope_id = (uint32_t)if_index;
736
if(quit_now){
737
errno = EINTR;
738
goto mandos_end;
739
}
457
740
458
741
if(debug){
459
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
460
char addrstr[INET6_ADDRSTRLEN] = "";
461
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
462
sizeof(addrstr)) == NULL){
463
perror("inet_ntop");
742
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
743
char interface[IF_NAMESIZE];
744
if(if_indextoname((unsigned int)if_index, interface) == NULL){
745
perror_plus("if_indextoname");
746
} else {
747
fprintf(stderr, "Mandos plugin mandos-client: "
748
"Connection to: %s%%%s, port %" PRIu16 "\n",
749
ip, interface, port);
750
}
751
} else {
752
fprintf(stderr, "Mandos plugin mandos-client: "
753
"Connection to: %s, port %" PRIu16 "\n", ip, port);
754
}
755
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
756
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
757
const char *pcret;
758
if(af == AF_INET6){
759
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
760
sizeof(addrstr));
761
} else {
762
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
763
sizeof(addrstr));
764
}
765
if(pcret == NULL){
766
perror_plus("inet_ntop");
464
767
} else {
465
768
if(strcmp(addrstr, ip) != 0){
466
fprintf(stderr, "Canonical address form: %s\n", addrstr);
769
fprintf(stderr, "Mandos plugin mandos-client: "
770
"Canonical address form: %s\n", addrstr);
467
771
}
468
772
}
469
773
}
470
774
471
ret = connect(tcp_sd, &to.in, sizeof(to));
472
if (ret < 0){
473
perror("connect");
474
return -1;
475
}
476
775
if(quit_now){
776
errno = EINTR;
777
goto mandos_end;
778
}
779
780
if(af == AF_INET6){
781
ret = connect(tcp_sd, &to.in6, sizeof(to));
782
} else {
783
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
784
}
785
if(ret < 0){
786
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
787
int e = errno;
788
perror_plus("connect");
789
errno = e;
790
}
791
goto mandos_end;
792
}
793
794
if(quit_now){
795
errno = EINTR;
796
goto mandos_end;
797
}
798
477
799
const char *out = mandos_protocol_version;
478
800
written = 0;
479
while (true){
801
while(true){
480
802
size_t out_size = strlen(out);
481
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
803
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
482
804
out_size - written));
483
if (ret == -1){
484
perror("write");
485
retval = -1;
805
if(ret == -1){
806
int e = errno;
807
perror_plus("write");
808
errno = e;
486
809
goto mandos_end;
487
810
}
488
811
written += (size_t)ret;
489
812
if(written < out_size){
490
813
continue;
491
814
} else {
492
if (out == mandos_protocol_version){
815
if(out == mandos_protocol_version){
493
816
written = 0;
494
817
out = "\r\n";
495
818
} else {
496
819
break;
497
820
}
498
821
}
822
823
if(quit_now){
824
errno = EINTR;
825
goto mandos_end;
826
}
499
827
}
500
828
501
829
if(debug){
502
fprintf(stderr, "Establishing TLS session with %s\n", ip);
503
}
504
505
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
506
507
ret = gnutls_handshake (session);
508
509
if (ret != GNUTLS_E_SUCCESS){
830
fprintf(stderr, "Mandos plugin mandos-client: "
831
"Establishing TLS session with %s\n", ip);
832
}
833
834
if(quit_now){
835
errno = EINTR;
836
goto mandos_end;
837
}
838
839
/* Spurious warning from -Wint-to-pointer-cast */
840
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
841
842
if(quit_now){
843
errno = EINTR;
844
goto mandos_end;
845
}
846
847
do {
848
ret = gnutls_handshake(session);
849
if(quit_now){
850
errno = EINTR;
851
goto mandos_end;
852
}
853
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
854
855
if(ret != GNUTLS_E_SUCCESS){
510
856
if(debug){
511
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
512
gnutls_perror (ret);
857
fprintf(stderr, "Mandos plugin mandos-client: "
858
"*** GnuTLS Handshake failed ***\n");
859
gnutls_perror(ret);
513
860
}
514
retval = -1;
861
errno = EPROTO;
515
862
goto mandos_end;
516
863
}
517
864
518
865
/* Read OpenPGP packet that contains the wanted password */
519
866
520
867
if(debug){
521
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
522
ip);
868
fprintf(stderr, "Mandos plugin mandos-client: "
869
"Retrieving OpenPGP encrypted password from %s\n", ip);
523
870
}
524
871
525
872
while(true){
526
buffer_capacity = adjustbuffer(&buffer, buffer_length,
873
874
if(quit_now){
875
errno = EINTR;
876
goto mandos_end;
877
}
878
879
buffer_capacity = incbuffer(&buffer, buffer_length,
527
880
buffer_capacity);
528
if (buffer_capacity == 0){
529
perror("adjustbuffer");
530
retval = -1;
531
goto mandos_end;
532
}
533
534
ret = gnutls_record_recv(session, buffer+buffer_length,
535
BUFFER_SIZE);
536
if (ret == 0){
881
if(buffer_capacity == 0){
882
int e = errno;
883
perror_plus("incbuffer");
884
errno = e;
885
goto mandos_end;
886
}
887
888
if(quit_now){
889
errno = EINTR;
890
goto mandos_end;
891
}
892
893
sret = gnutls_record_recv(session, buffer+buffer_length,
894
BUFFER_SIZE);
895
if(sret == 0){
537
896
break;
538
897
}
539
if (ret < 0){
540
switch(ret){
898
if(sret < 0){
899
switch(sret){
541
900
case GNUTLS_E_INTERRUPTED:
542
901
case GNUTLS_E_AGAIN:
543
902
break;
544
903
case GNUTLS_E_REHANDSHAKE:
545
ret = gnutls_handshake (session);
546
if (ret < 0){
547
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
548
gnutls_perror (ret);
549
retval = -1;
904
do {
905
ret = gnutls_handshake(session);
906
907
if(quit_now){
908
errno = EINTR;
909
goto mandos_end;
910
}
911
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
912
if(ret < 0){
913
fprintf(stderr, "Mandos plugin mandos-client: "
914
"*** GnuTLS Re-handshake failed ***\n");
915
gnutls_perror(ret);
916
errno = EPROTO;
550
917
goto mandos_end;
551
918
}
552
919
break;
553
920
default:
554
fprintf(stderr, "Unknown error while reading data from"
921
fprintf(stderr, "Mandos plugin mandos-client: "
922
"Unknown error while reading data from"
555
923
" encrypted session with Mandos server\n");
556
retval = -1;
557
gnutls_bye (session, GNUTLS_SHUT_RDWR);
924
gnutls_bye(session, GNUTLS_SHUT_RDWR);
925
errno = EIO;
558
926
goto mandos_end;
559
927
}
560
928
} else {
561
buffer_length += (size_t) ret;
929
buffer_length += (size_t) sret;
562
930
}
563
931
}
564
932
565
933
if(debug){
566
fprintf(stderr, "Closing TLS session\n");
567
}
568
569
gnutls_bye (session, GNUTLS_SHUT_RDWR);
570
571
if (buffer_length > 0){
934
fprintf(stderr, "Mandos plugin mandos-client: "
935
"Closing TLS session\n");
936
}
937
938
if(quit_now){
939
errno = EINTR;
940
goto mandos_end;
941
}
942
943
do {
944
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
945
if(quit_now){
946
errno = EINTR;
947
goto mandos_end;
948
}
949
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
950
951
if(buffer_length > 0){
952
ssize_t decrypted_buffer_size;
572
953
decrypted_buffer_size = pgp_packet_decrypt(buffer,
573
954
buffer_length,
574
&decrypted_buffer,
575
keydir);
576
if (decrypted_buffer_size >= 0){
955
&decrypted_buffer);
956
if(decrypted_buffer_size >= 0){
957
577
958
written = 0;
578
959
while(written < (size_t) decrypted_buffer_size){
579
ret = (int)fwrite (decrypted_buffer + written, 1,
580
(size_t)decrypted_buffer_size - written,
581
stdout);
960
if(quit_now){
961
errno = EINTR;
962
goto mandos_end;
963
}
964
965
ret = (int)fwrite(decrypted_buffer + written, 1,
966
(size_t)decrypted_buffer_size - written,
967
stdout);
582
968
if(ret == 0 and ferror(stdout)){
969
int e = errno;
583
970
if(debug){
584
fprintf(stderr, "Error writing encrypted data: %s\n",
971
fprintf(stderr, "Mandos plugin mandos-client: "
972
"Error writing encrypted data: %s\n",
585
973
strerror(errno));
586
974
}
587
retval = -1;
588
break;
975
errno = e;
976
goto mandos_end;
589
977
}
590
978
written += (size_t)ret;
591
979
}
592
free(decrypted_buffer);
593
} else {
594
retval = -1;
980
retval = 0;
595
981
}
596
982
}
597
983
598
984
/* Shutdown procedure */
599
985
600
986
mandos_end:
601
free(buffer);
602
close(tcp_sd);
603
gnutls_deinit (session);
604
gnutls_certificate_free_credentials (mc->cred);
605
gnutls_global_deinit ();
987
{
988
int e = errno;
989
free(decrypted_buffer);
990
free(buffer);
991
if(tcp_sd >= 0){
992
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
993
}
994
if(ret == -1){
995
if(e == 0){
996
e = errno;
997
}
998
perror_plus("close");
999
}
1000
gnutls_deinit(session);
1001
errno = e;
1002
if(quit_now){
1003
errno = EINTR;
1004
retval = -1;
1005
}
1006
}
606
1007
return retval;
607
1008
}
608
1009
609
1010
static void resolve_callback(AvahiSServiceResolver *r,
610
1011
AvahiIfIndex interface,
611
AVAHI_GCC_UNUSED AvahiProtocol protocol,
1012
AvahiProtocol proto,
612
1013
AvahiResolverEvent event,
613
1014
const char *name,
614
1015
const char *type,
619
1020
AVAHI_GCC_UNUSED AvahiStringList *txt,
620
1021
AVAHI_GCC_UNUSED AvahiLookupResultFlags
621
1022
flags,
622
void* userdata) {
623
mandos_context *mc = userdata;
624
assert(r); /* Spurious warning */
1023
AVAHI_GCC_UNUSED void* userdata){
1024
assert(r);
625
1025
626
1026
/* Called whenever a service has been resolved successfully or
627
1027
timed out */
628
1028
629
switch (event) {
1029
if(quit_now){
1030
return;
1031
}
1032
1033
switch(event){
630
1034
default:
631
1035
case AVAHI_RESOLVER_FAILURE:
632
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
1036
fprintf(stderr, "Mandos plugin mandos-client: "
1037
"(Avahi Resolver) Failed to resolve service '%s'"
633
1038
" of type '%s' in domain '%s': %s\n", name, type, domain,
634
avahi_strerror(avahi_server_errno(mc->server)));
1039
avahi_strerror(avahi_server_errno(mc.server)));
635
1040
break;
636
1041
637
1042
case AVAHI_RESOLVER_FOUND:
639
1044
char ip[AVAHI_ADDRESS_STR_MAX];
640
1045
avahi_address_snprint(ip, sizeof(ip), address);
641
1046
if(debug){
642
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %d) on"
643
" port %d\n", name, host_name, ip, interface, port);
1047
fprintf(stderr, "Mandos plugin mandos-client: "
1048
"Mandos server \"%s\" found on %s (%s, %"
1049
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1050
ip, (intmax_t)interface, port);
644
1051
}
645
int ret = start_mandos_communication(ip, port, interface, mc);
646
if (ret == 0){
647
exit(EXIT_SUCCESS);
1052
int ret = start_mandos_communication(ip, port, interface,
1053
avahi_proto_to_af(proto));
1054
if(ret == 0){
1055
avahi_simple_poll_quit(mc.simple_poll);
1056
} else {
1057
ret = add_server(ip, port, interface,
1058
avahi_proto_to_af(proto));
648
1059
}
649
1060
}
650
1061
}
651
1062
avahi_s_service_resolver_free(r);
652
1063
}
653
1064
654
static void browse_callback( AvahiSServiceBrowser *b,
655
AvahiIfIndex interface,
656
AvahiProtocol protocol,
657
AvahiBrowserEvent event,
658
const char *name,
659
const char *type,
660
const char *domain,
661
AVAHI_GCC_UNUSED AvahiLookupResultFlags
662
flags,
663
void* userdata) {
664
mandos_context *mc = userdata;
665
assert(b); /* Spurious warning */
1065
static void browse_callback(AvahiSServiceBrowser *b,
1066
AvahiIfIndex interface,
1067
AvahiProtocol protocol,
1068
AvahiBrowserEvent event,
1069
const char *name,
1070
const char *type,
1071
const char *domain,
1072
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1073
flags,
1074
AVAHI_GCC_UNUSED void* userdata){
1075
assert(b);
666
1076
667
1077
/* Called whenever a new services becomes available on the LAN or
668
1078
is removed from the LAN */
669
1079
670
switch (event) {
1080
if(quit_now){
1081
return;
1082
}
1083
1084
switch(event){
671
1085
default:
672
1086
case AVAHI_BROWSER_FAILURE:
673
1087
674
fprintf(stderr, "(Avahi browser) %s\n",
675
avahi_strerror(avahi_server_errno(mc->server)));
676
avahi_simple_poll_quit(mc->simple_poll);
1088
fprintf(stderr, "Mandos plugin mandos-client: "
1089
"(Avahi browser) %s\n",
1090
avahi_strerror(avahi_server_errno(mc.server)));
1091
avahi_simple_poll_quit(mc.simple_poll);
677
1092
return;
678
1093
679
1094
case AVAHI_BROWSER_NEW:
682
1097
the callback function is called the Avahi server will free the
683
1098
resolver for us. */
684
1099
685
if (!(avahi_s_service_resolver_new(mc->server, interface,
686
protocol, name, type, domain,
687
AVAHI_PROTO_INET6, 0,
688
resolve_callback, mc)))
689
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
690
name, avahi_strerror(avahi_server_errno(mc->server)));
1100
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1101
name, type, domain, protocol, 0,
1102
resolve_callback, NULL) == NULL)
1103
fprintf(stderr, "Mandos plugin mandos-client: "
1104
"Avahi: Failed to resolve service '%s': %s\n",
1105
name, avahi_strerror(avahi_server_errno(mc.server)));
691
1106
break;
692
1107
693
1108
case AVAHI_BROWSER_REMOVE:
696
1111
case AVAHI_BROWSER_ALL_FOR_NOW:
697
1112
case AVAHI_BROWSER_CACHE_EXHAUSTED:
698
1113
if(debug){
699
fprintf(stderr, "No Mandos server found, still searching...\n");
1114
fprintf(stderr, "Mandos plugin mandos-client: "
1115
"No Mandos server found, still searching...\n");
700
1116
}
701
1117
break;
702
1118
}
703
1119
}
704
1120
705
/* Combines file name and path and returns the malloced new
706
string. some sane checks could/should be added */
707
static const char *combinepath(const char *first, const char *second){
708
size_t f_len = strlen(first);
709
size_t s_len = strlen(second);
710
char *tmp = malloc(f_len + s_len + 2);
711
if (tmp == NULL){
712
return NULL;
713
}
714
if(f_len > 0){
715
memcpy(tmp, first, f_len); /* Spurious warning */
716
}
717
tmp[f_len] = '/';
718
if(s_len > 0){
719
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
720
}
721
tmp[f_len + 1 + s_len] = '\0';
722
return tmp;
723
}
724
1121
/* Signal handler that stops main loop after SIGTERM */
1122
static void handle_sigterm(int sig){
1123
if(quit_now){
1124
return;
1125
}
1126
quit_now = 1;
1127
signal_received = sig;
1128
int old_errno = errno;
1129
/* set main loop to exit */
1130
if(mc.simple_poll != NULL){
1131
avahi_simple_poll_quit(mc.simple_poll);
1132
}
1133
errno = old_errno;
1134
}
1135
1136
bool get_flags(const char *ifname, struct ifreq *ifr){
1137
int ret;
1138
1139
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1140
if(s < 0){
1141
perror_plus("socket");
1142
return false;
1143
}
1144
strcpy(ifr->ifr_name, ifname);
1145
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1146
if(ret == -1){
1147
if(debug){
1148
perror_plus("ioctl SIOCGIFFLAGS");
1149
}
1150
return false;
1151
}
1152
return true;
1153
}
1154
1155
bool good_flags(const char *ifname, const struct ifreq *ifr){
1156
1157
/* Reject the loopback device */
1158
if(ifr->ifr_flags & IFF_LOOPBACK){
1159
if(debug){
1160
fprintf(stderr, "Mandos plugin mandos-client: "
1161
"Rejecting loopback interface \"%s\"\n", ifname);
1162
}
1163
return false;
1164
}
1165
/* Accept point-to-point devices only if connect_to is specified */
1166
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1167
if(debug){
1168
fprintf(stderr, "Mandos plugin mandos-client: "
1169
"Accepting point-to-point interface \"%s\"\n", ifname);
1170
}
1171
return true;
1172
}
1173
/* Otherwise, reject non-broadcast-capable devices */
1174
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1175
if(debug){
1176
fprintf(stderr, "Mandos plugin mandos-client: "
1177
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1178
}
1179
return false;
1180
}
1181
/* Reject non-ARP interfaces (including dummy interfaces) */
1182
if(ifr->ifr_flags & IFF_NOARP){
1183
if(debug){
1184
fprintf(stderr, "Mandos plugin mandos-client: "
1185
"Rejecting non-ARP interface \"%s\"\n", ifname);
1186
}
1187
return false;
1188
}
1189
1190
/* Accept this device */
1191
if(debug){
1192
fprintf(stderr, "Mandos plugin mandos-client: "
1193
"Interface \"%s\" is good\n", ifname);
1194
}
1195
return true;
1196
}
1197
1198
/*
1199
* This function determines if a directory entry in /sys/class/net
1200
* corresponds to an acceptable network device.
1201
* (This function is passed to scandir(3) as a filter function.)
1202
*/
1203
int good_interface(const struct dirent *if_entry){
1204
if(if_entry->d_name[0] == '.'){
1205
return 0;
1206
}
1207
1208
struct ifreq ifr;
1209
if(not get_flags(if_entry->d_name, &ifr)){
1210
if(debug){
1211
fprintf(stderr, "Mandos plugin mandos-client: "
1212
"Failed to get flags for interface \"%s\"\n",
1213
if_entry->d_name);
1214
}
1215
return 0;
1216
}
1217
1218
if(not good_flags(if_entry->d_name, &ifr)){
1219
return 0;
1220
}
1221
return 1;
1222
}
1223
1224
/*
1225
* This function determines if a directory entry in /sys/class/net
1226
* corresponds to an acceptable network device which is up.
1227
* (This function is passed to scandir(3) as a filter function.)
1228
*/
1229
int up_interface(const struct dirent *if_entry){
1230
if(if_entry->d_name[0] == '.'){
1231
return 0;
1232
}
1233
1234
struct ifreq ifr;
1235
if(not get_flags(if_entry->d_name, &ifr)){
1236
if(debug){
1237
fprintf(stderr, "Mandos plugin mandos-client: "
1238
"Failed to get flags for interface \"%s\"\n",
1239
if_entry->d_name);
1240
}
1241
return 0;
1242
}
1243
1244
/* Reject down interfaces */
1245
if(not (ifr.ifr_flags & IFF_UP)){
1246
if(debug){
1247
fprintf(stderr, "Mandos plugin mandos-client: "
1248
"Rejecting down interface \"%s\"\n",
1249
if_entry->d_name);
1250
}
1251
return 0;
1252
}
1253
1254
/* Reject non-running interfaces */
1255
if(not (ifr.ifr_flags & IFF_RUNNING)){
1256
if(debug){
1257
fprintf(stderr, "Mandos plugin mandos-client: "
1258
"Rejecting non-running interface \"%s\"\n",
1259
if_entry->d_name);
1260
}
1261
return 0;
1262
}
1263
1264
if(not good_flags(if_entry->d_name, &ifr)){
1265
return 0;
1266
}
1267
return 1;
1268
}
1269
1270
int notdotentries(const struct dirent *direntry){
1271
/* Skip "." and ".." */
1272
if(direntry->d_name[0] == '.'
1273
and (direntry->d_name[1] == '\0'
1274
or (direntry->d_name[1] == '.'
1275
and direntry->d_name[2] == '\0'))){
1276
return 0;
1277
}
1278
return 1;
1279
}
1280
1281
/* Is this directory entry a runnable program? */
1282
int runnable_hook(const struct dirent *direntry){
1283
int ret;
1284
struct stat st;
1285
1286
if((direntry->d_name)[0] == '\0'){
1287
/* Empty name? */
1288
return 0;
1289
}
1290
1291
/* Save pointer to last character */
1292
char *end = strchr(direntry->d_name, '\0')-1;
1293
1294
if(*end == '~'){
1295
/* Backup name~ */
1296
return 0;
1297
}
1298
1299
if(((direntry->d_name)[0] == '#')
1300
and (*end == '#')){
1301
/* Temporary #name# */
1302
return 0;
1303
}
1304
1305
/* XXX more rules here */
1306
1307
ret = stat(direntry->d_name, &st);
1308
if(ret == -1){
1309
if(debug){
1310
perror_plus("Could not stat plugin");
1311
}
1312
return 0;
1313
}
1314
if(not (S_ISREG(st.st_mode))){
1315
/* Not a regular file */
1316
return 0;
1317
}
1318
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1319
/* Not executable */
1320
return 0;
1321
}
1322
return 1;
1323
}
1324
1325
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1326
int ret;
1327
struct timespec now;
1328
struct timespec waited_time;
1329
intmax_t block_time;
1330
1331
while(true){
1332
if(mc.current_server == NULL){
1333
if (debug){
1334
fprintf(stderr, "Mandos plugin mandos-client: "
1335
"Wait until first server is found. No timeout!\n");
1336
}
1337
ret = avahi_simple_poll_iterate(s, -1);
1338
} else {
1339
if (debug){
1340
fprintf(stderr, "Mandos plugin mandos-client: "
1341
"Check current_server if we should run it,"
1342
" or wait\n");
1343
}
1344
/* the current time */
1345
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1346
if(ret == -1){
1347
perror_plus("clock_gettime");
1348
return -1;
1349
}
1350
/* Calculating in ms how long time between now and server
1351
who we visted longest time ago. Now - last seen. */
1352
waited_time.tv_sec = (now.tv_sec
1353
- mc.current_server->last_seen.tv_sec);
1354
waited_time.tv_nsec = (now.tv_nsec
1355
- mc.current_server->last_seen.tv_nsec);
1356
/* total time is 10s/10,000ms.
1357
Converting to s from ms by dividing by 1,000,
1358
and ns to ms by dividing by 1,000,000. */
1359
block_time = ((retry_interval
1360
- ((intmax_t)waited_time.tv_sec * 1000))
1361
- ((intmax_t)waited_time.tv_nsec / 1000000));
1362
1363
if (debug){
1364
fprintf(stderr, "Mandos plugin mandos-client: "
1365
"Blocking for %" PRIdMAX " ms\n", block_time);
1366
}
1367
1368
if(block_time <= 0){
1369
ret = start_mandos_communication(mc.current_server->ip,
1370
mc.current_server->port,
1371
mc.current_server->if_index,
1372
mc.current_server->af);
1373
if(ret == 0){
1374
avahi_simple_poll_quit(mc.simple_poll);
1375
return 0;
1376
}
1377
ret = clock_gettime(CLOCK_MONOTONIC,
1378
&mc.current_server->last_seen);
1379
if(ret == -1){
1380
perror_plus("clock_gettime");
1381
return -1;
1382
}
1383
mc.current_server = mc.current_server->next;
1384
block_time = 0; /* Call avahi to find new Mandos
1385
servers, but don't block */
1386
}
1387
1388
ret = avahi_simple_poll_iterate(s, (int)block_time);
1389
}
1390
if(ret != 0){
1391
if (ret > 0 or errno != EINTR){
1392
return (ret != 1) ? ret : 0;
1393
}
1394
}
1395
}
1396
}
725
1397
726
1398
int main(int argc, char *argv[]){
727
AvahiSServiceBrowser *sb = NULL;
728
int error;
729
int ret;
730
int exitcode = EXIT_SUCCESS;
731
const char *interface = "eth0";
732
struct ifreq network;
733
int sd;
734
uid_t uid;
735
gid_t gid;
736
char *connect_to = NULL;
737
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
738
const char *pubkeyfile = "pubkey.txt";
739
const char *seckeyfile = "seckey.txt";
740
mandos_context mc = { .simple_poll = NULL, .server = NULL,
741
.dh_bits = 1024, .priority = "SECURE256"};
742
743
{
744
struct argp_option options[] = {
745
{ .name = "debug", .key = 128,
746
.doc = "Debug mode", .group = 3 },
747
{ .name = "connect", .key = 'c',
748
.arg = "IP",
749
.doc = "Connect directly to a sepcified mandos server",
750
.group = 1 },
751
{ .name = "interface", .key = 'i',
752
.arg = "INTERFACE",
753
.doc = "Interface that Avahi will conntect through",
754
.group = 1 },
755
{ .name = "keydir", .key = 'd',
756
.arg = "KEYDIR",
757
.doc = "Directory where the openpgp keyring is",
758
.group = 1 },
759
{ .name = "seckey", .key = 's',
760
.arg = "SECKEY",
761
.doc = "Secret openpgp key for gnutls authentication",
762
.group = 1 },
763
{ .name = "pubkey", .key = 'p',
764
.arg = "PUBKEY",
765
.doc = "Public openpgp key for gnutls authentication",
766
.group = 2 },
767
{ .name = "dh-bits", .key = 129,
768
.arg = "BITS",
769
.doc = "dh-bits to use in gnutls communication",
770
.group = 2 },
771
{ .name = "priority", .key = 130,
772
.arg = "PRIORITY",
773
.doc = "GNUTLS priority", .group = 1 },
774
{ .name = NULL }
775
};
776
777
778
error_t parse_opt (int key, char *arg,
779
struct argp_state *state) {
780
/* Get the INPUT argument from `argp_parse', which we know is
781
a pointer to our plugin list pointer. */
782
switch (key) {
783
case 128:
784
debug = true;
785
break;
786
case 'c':
787
connect_to = arg;
788
break;
789
case 'i':
790
interface = arg;
791
break;
792
case 'd':
793
keydir = arg;
794
break;
795
case 's':
796
seckeyfile = arg;
797
break;
798
case 'p':
799
pubkeyfile = arg;
800
break;
801
case 129:
802
errno = 0;
803
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
804
if (errno){
805
perror("strtol");
806
exit(EXIT_FAILURE);
807
}
808
break;
809
case 130:
810
mc.priority = arg;
811
break;
812
case ARGP_KEY_ARG:
813
argp_usage (state);
814
break;
815
case ARGP_KEY_END:
816
break;
817
default:
818
return ARGP_ERR_UNKNOWN;
819
}
820
return 0;
821
}
822
823
struct argp argp = { .options = options, .parser = parse_opt,
824
.args_doc = "",
825
.doc = "Mandos client -- Get and decrypt"
826
" passwords from mandos server" };
827
argp_parse (&argp, argc, argv, 0, 0, NULL);
828
}
829
830
pubkeyfile = combinepath(keydir, pubkeyfile);
831
if (pubkeyfile == NULL){
832
perror("combinepath");
1399
AvahiSServiceBrowser *sb = NULL;
1400
int error;
1401
int ret;
1402
intmax_t tmpmax;
1403
char *tmp;
1404
int exitcode = EXIT_SUCCESS;
1405
const char *interface = "";
1406
struct ifreq network;
1407
int sd = -1;
1408
bool take_down_interface = false;
1409
uid_t uid;
1410
gid_t gid;
1411
char tempdir[] = "/tmp/mandosXXXXXX";
1412
bool tempdir_created = false;
1413
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1414
const char *seckey = PATHDIR "/" SECKEY;
1415
const char *pubkey = PATHDIR "/" PUBKEY;
1416
1417
bool gnutls_initialized = false;
1418
bool gpgme_initialized = false;
1419
float delay = 2.5f;
1420
double retry_interval = 10; /* 10s between trying a server and
1421
retrying the same server again */
1422
1423
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1424
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1425
1426
uid = getuid();
1427
gid = getgid();
1428
1429
/* Lower any group privileges we might have, just to be safe */
1430
errno = 0;
1431
ret = setgid(gid);
1432
if(ret == -1){
1433
perror_plus("setgid");
1434
}
1435
1436
/* Lower user privileges (temporarily) */
1437
errno = 0;
1438
ret = seteuid(uid);
1439
if(ret == -1){
1440
perror_plus("seteuid");
1441
}
1442
1443
if(quit_now){
1444
goto end;
1445
}
1446
1447
{
1448
struct argp_option options[] = {
1449
{ .name = "debug", .key = 128,
1450
.doc = "Debug mode", .group = 3 },
1451
{ .name = "connect", .key = 'c',
1452
.arg = "ADDRESS:PORT",
1453
.doc = "Connect directly to a specific Mandos server",
1454
.group = 1 },
1455
{ .name = "interface", .key = 'i',
1456
.arg = "NAME",
1457
.doc = "Network interface that will be used to search for"
1458
" Mandos servers",
1459
.group = 1 },
1460
{ .name = "seckey", .key = 's',
1461
.arg = "FILE",
1462
.doc = "OpenPGP secret key file base name",
1463
.group = 1 },
1464
{ .name = "pubkey", .key = 'p',
1465
.arg = "FILE",
1466
.doc = "OpenPGP public key file base name",
1467
.group = 2 },
1468
{ .name = "dh-bits", .key = 129,
1469
.arg = "BITS",
1470
.doc = "Bit length of the prime number used in the"
1471
" Diffie-Hellman key exchange",
1472
.group = 2 },
1473
{ .name = "priority", .key = 130,
1474
.arg = "STRING",
1475
.doc = "GnuTLS priority string for the TLS handshake",
1476
.group = 1 },
1477
{ .name = "delay", .key = 131,
1478
.arg = "SECONDS",
1479
.doc = "Maximum delay to wait for interface startup",
1480
.group = 2 },
1481
{ .name = "retry", .key = 132,
1482
.arg = "SECONDS",
1483
.doc = "Retry interval used when denied by the mandos server",
1484
.group = 2 },
1485
/*
1486
* These reproduce what we would get without ARGP_NO_HELP
1487
*/
1488
{ .name = "help", .key = '?',
1489
.doc = "Give this help list", .group = -1 },
1490
{ .name = "usage", .key = -3,
1491
.doc = "Give a short usage message", .group = -1 },
1492
{ .name = "version", .key = 'V',
1493
.doc = "Print program version", .group = -1 },
1494
{ .name = NULL }
1495
};
1496
1497
error_t parse_opt(int key, char *arg,
1498
struct argp_state *state){
1499
errno = 0;
1500
switch(key){
1501
case 128: /* --debug */
1502
debug = true;
1503
break;
1504
case 'c': /* --connect */
1505
connect_to = arg;
1506
break;
1507
case 'i': /* --interface */
1508
interface = arg;
1509
break;
1510
case 's': /* --seckey */
1511
seckey = arg;
1512
break;
1513
case 'p': /* --pubkey */
1514
pubkey = arg;
1515
break;
1516
case 129: /* --dh-bits */
1517
errno = 0;
1518
tmpmax = strtoimax(arg, &tmp, 10);
1519
if(errno != 0 or tmp == arg or *tmp != '\0'
1520
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1521
argp_error(state, "Bad number of DH bits");
1522
}
1523
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1524
break;
1525
case 130: /* --priority */
1526
mc.priority = arg;
1527
break;
1528
case 131: /* --delay */
1529
errno = 0;
1530
delay = strtof(arg, &tmp);
1531
if(errno != 0 or tmp == arg or *tmp != '\0'){
1532
argp_error(state, "Bad delay");
1533
}
1534
case 132: /* --retry */
1535
errno = 0;
1536
retry_interval = strtod(arg, &tmp);
1537
if(errno != 0 or tmp == arg or *tmp != '\0'
1538
or (retry_interval * 1000) > INT_MAX
1539
or retry_interval < 0){
1540
argp_error(state, "Bad retry interval");
1541
}
1542
break;
1543
/*
1544
* These reproduce what we would get without ARGP_NO_HELP
1545
*/
1546
case '?': /* --help */
1547
argp_state_help(state, state->out_stream,
1548
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1549
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1550
case -3: /* --usage */
1551
argp_state_help(state, state->out_stream,
1552
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1553
case 'V': /* --version */
1554
fprintf(state->out_stream, "Mandos plugin mandos-client: ");
1555
fprintf(state->out_stream, "%s\n", argp_program_version);
1556
exit(argp_err_exit_status);
1557
break;
1558
default:
1559
return ARGP_ERR_UNKNOWN;
1560
}
1561
return errno;
1562
}
1563
1564
struct argp argp = { .options = options, .parser = parse_opt,
1565
.args_doc = "",
1566
.doc = "Mandos client -- Get and decrypt"
1567
" passwords from a Mandos server" };
1568
ret = argp_parse(&argp, argc, argv,
1569
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1570
switch(ret){
1571
case 0:
1572
break;
1573
case ENOMEM:
1574
default:
1575
errno = ret;
1576
perror_plus("argp_parse");
1577
exitcode = EX_OSERR;
1578
goto end;
1579
case EINVAL:
1580
exitcode = EX_USAGE;
1581
goto end;
1582
}
1583
}
1584
1585
{
1586
/* Work around Debian bug #633582:
1587
<http://bugs.debian.org/633582> */
1588
struct stat st;
1589
1590
/* Re-raise priviliges */
1591
errno = 0;
1592
ret = seteuid(0);
1593
if(ret == -1){
1594
perror_plus("seteuid");
1595
}
1596
1597
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1598
int seckey_fd = open(seckey, O_RDONLY);
1599
if(seckey_fd == -1){
1600
perror_plus("open");
1601
} else {
1602
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1603
if(ret == -1){
1604
perror_plus("fstat");
1605
} else {
1606
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1607
ret = fchown(seckey_fd, uid, gid);
1608
if(ret == -1){
1609
perror_plus("fchown");
1610
}
1611
}
1612
}
1613
TEMP_FAILURE_RETRY(close(seckey_fd));
1614
}
1615
}
1616
1617
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1618
int pubkey_fd = open(pubkey, O_RDONLY);
1619
if(pubkey_fd == -1){
1620
perror_plus("open");
1621
} else {
1622
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1623
if(ret == -1){
1624
perror_plus("fstat");
1625
} else {
1626
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1627
ret = fchown(pubkey_fd, uid, gid);
1628
if(ret == -1){
1629
perror_plus("fchown");
1630
}
1631
}
1632
}
1633
TEMP_FAILURE_RETRY(close(pubkey_fd));
1634
}
1635
}
1636
1637
/* Lower privileges */
1638
errno = 0;
1639
ret = seteuid(uid);
1640
if(ret == -1){
1641
perror_plus("seteuid");
1642
}
1643
}
1644
1645
/* Find network hooks and run them */
1646
{
1647
struct dirent **direntries;
1648
struct dirent *direntry;
1649
int numhooks = scandir(HOOKDIR, &direntries, runnable_hook,
1650
alphasort);
1651
if(numhooks == -1){
1652
perror_plus("scandir");
1653
} else {
1654
int devnull = open("/dev/null", O_RDONLY);
1655
for(int i = 0; i < numhooks; i++){
1656
direntry = direntries[0];
1657
char *fullname = NULL;
1658
ret = asprintf(&fullname, "%s/%s", tempdir,
1659
direntry->d_name);
1660
if(ret < 0){
1661
perror_plus("asprintf");
1662
continue;
1663
}
1664
pid_t hook_pid = fork();
1665
if(hook_pid == 0){
1666
/* Child */
1667
dup2(devnull, STDIN_FILENO);
1668
close(devnull);
1669
dup2(STDERR_FILENO, STDOUT_FILENO);
1670
ret = setenv("DEVICE", interface, 1);
1671
if(ret == -1){
1672
perror_plus("setenv");
1673
exit(1);
1674
}
1675
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1676
if(ret == -1){
1677
perror_plus("setenv");
1678
exit(1);
1679
}
1680
ret = setenv("MODE", "start", 1);
1681
if(ret == -1){
1682
perror_plus("setenv");
1683
exit(1);
1684
}
1685
char *delaystring;
1686
ret = asprintf(&delaystring, "%f", delay);
1687
if(ret == -1){
1688
perror_plus("asprintf");
1689
exit(1);
1690
}
1691
ret = setenv("DELAY", delaystring, 1);
1692
if(ret == -1){
1693
free(delaystring);
1694
perror_plus("setenv");
1695
exit(1);
1696
}
1697
free(delaystring);
1698
ret = execl(fullname, direntry->d_name, "start", NULL);
1699
perror_plus("execl");
1700
} else {
1701
int status;
1702
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1703
perror_plus("waitpid");
1704
free(fullname);
1705
continue;
1706
}
1707
if(WIFEXITED(status)){
1708
if(WEXITSTATUS(status) != 0){
1709
fprintf(stderr, "Mandos plugin mandos-client: "
1710
"Warning: network hook \"%s\" exited"
1711
" with status %d\n", direntry->d_name,
1712
WEXITSTATUS(status));
1713
free(fullname);
1714
continue;
1715
}
1716
} else if(WIFSIGNALED(status)){
1717
fprintf(stderr, "Mandos plugin mandos-client: "
1718
"Warning: network hook \"%s\" died by"
1719
" signal %d\n", direntry->d_name,
1720
WTERMSIG(status));
1721
free(fullname);
1722
continue;
1723
} else {
1724
fprintf(stderr, "Mandos plugin mandos-client: "
1725
"Warning: network hook \"%s\" crashed\n",
1726
direntry->d_name);
1727
free(fullname);
1728
continue;
1729
}
1730
}
1731
free(fullname);
1732
if(quit_now){
1733
goto end;
1734
}
1735
}
1736
close(devnull);
1737
}
1738
}
1739
1740
if(not debug){
1741
avahi_set_log_function(empty_log);
1742
}
1743
1744
if(interface[0] == '\0'){
1745
struct dirent **direntries;
1746
/* First look for interfaces that are up */
1747
ret = scandir(sys_class_net, &direntries, up_interface,
1748
alphasort);
1749
if(ret == 0){
1750
/* No up interfaces, look for any good interfaces */
1751
free(direntries);
1752
ret = scandir(sys_class_net, &direntries, good_interface,
1753
alphasort);
1754
}
1755
if(ret >= 1){
1756
/* Pick the first interface returned */
1757
interface = strdup(direntries[0]->d_name);
1758
if(debug){
1759
fprintf(stderr, "Mandos plugin mandos-client: "
1760
"Using interface \"%s\"\n", interface);
1761
}
1762
if(interface == NULL){
1763
perror_plus("malloc");
1764
free(direntries);
1765
exitcode = EXIT_FAILURE;
1766
goto end;
1767
}
1768
free(direntries);
1769
} else {
1770
free(direntries);
1771
fprintf(stderr, "Mandos plugin mandos-client: "
1772
"Could not find a network interface\n");
833
1773
exitcode = EXIT_FAILURE;
834
1774
goto end;
835
1775
}
836
837
seckeyfile = combinepath(keydir, seckeyfile);
838
if (seckeyfile == NULL){
839
perror("combinepath");
840
goto end;
841
}
842
843
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
844
if (ret == -1){
845
fprintf(stderr, "init_gnutls_global\n");
846
goto end;
847
}
848
849
uid = getuid();
850
gid = getgid();
851
852
ret = setuid(uid);
853
if (ret == -1){
854
perror("setuid");
855
}
856
857
setgid(gid);
858
if (ret == -1){
859
perror("setgid");
860
}
861
1776
}
1777
1778
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1779
from the signal handler */
1780
/* Initialize the pseudo-RNG for Avahi */
1781
srand((unsigned int) time(NULL));
1782
mc.simple_poll = avahi_simple_poll_new();
1783
if(mc.simple_poll == NULL){
1784
fprintf(stderr, "Mandos plugin mandos-client: "
1785
"Avahi: Failed to create simple poll object.\n");
1786
exitcode = EX_UNAVAILABLE;
1787
goto end;
1788
}
1789
1790
sigemptyset(&sigterm_action.sa_mask);
1791
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1792
if(ret == -1){
1793
perror_plus("sigaddset");
1794
exitcode = EX_OSERR;
1795
goto end;
1796
}
1797
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1798
if(ret == -1){
1799
perror_plus("sigaddset");
1800
exitcode = EX_OSERR;
1801
goto end;
1802
}
1803
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1804
if(ret == -1){
1805
perror_plus("sigaddset");
1806
exitcode = EX_OSERR;
1807
goto end;
1808
}
1809
/* Need to check if the handler is SIG_IGN before handling:
1810
| [[info:libc:Initial Signal Actions]] |
1811
| [[info:libc:Basic Signal Handling]] |
1812
*/
1813
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1814
if(ret == -1){
1815
perror_plus("sigaction");
1816
return EX_OSERR;
1817
}
1818
if(old_sigterm_action.sa_handler != SIG_IGN){
1819
ret = sigaction(SIGINT, &sigterm_action, NULL);
1820
if(ret == -1){
1821
perror_plus("sigaction");
1822
exitcode = EX_OSERR;
1823
goto end;
1824
}
1825
}
1826
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1827
if(ret == -1){
1828
perror_plus("sigaction");
1829
return EX_OSERR;
1830
}
1831
if(old_sigterm_action.sa_handler != SIG_IGN){
1832
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1833
if(ret == -1){
1834
perror_plus("sigaction");
1835
exitcode = EX_OSERR;
1836
goto end;
1837
}
1838
}
1839
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1840
if(ret == -1){
1841
perror_plus("sigaction");
1842
return EX_OSERR;
1843
}
1844
if(old_sigterm_action.sa_handler != SIG_IGN){
1845
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1846
if(ret == -1){
1847
perror_plus("sigaction");
1848
exitcode = EX_OSERR;
1849
goto end;
1850
}
1851
}
1852
1853
/* If the interface is down, bring it up */
1854
if(strcmp(interface, "none") != 0){
862
1855
if_index = (AvahiIfIndex) if_nametoindex(interface);
863
1856
if(if_index == 0){
864
fprintf(stderr, "No such interface: \"%s\"\n", interface);
865
exit(EXIT_FAILURE);
866
}
867
868
if(connect_to != NULL){
869
/* Connect directly, do not use Zeroconf */
870
/* (Mainly meant for debugging) */
871
char *address = strrchr(connect_to, ':');
872
if(address == NULL){
873
fprintf(stderr, "No colon in address\n");
874
exitcode = EXIT_FAILURE;
875
goto end;
876
}
877
errno = 0;
878
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
879
if(errno){
880
perror("Bad port number");
881
exitcode = EXIT_FAILURE;
882
goto end;
883
}
884
*address = '\0';
885
address = connect_to;
886
ret = start_mandos_communication(address, port, if_index, &mc);
887
if(ret < 0){
888
exitcode = EXIT_FAILURE;
889
} else {
890
exitcode = EXIT_SUCCESS;
891
}
892
goto end;
893
}
894
895
/* If the interface is down, bring it up */
896
{
897
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
898
if(sd < 0) {
899
perror("socket");
900
exitcode = EXIT_FAILURE;
901
goto end;
902
}
903
strcpy(network.ifr_name, interface); /* Spurious warning */
904
ret = ioctl(sd, SIOCGIFFLAGS, &network);
905
if(ret == -1){
906
perror("ioctl SIOCGIFFLAGS");
907
exitcode = EXIT_FAILURE;
908
goto end;
909
}
910
if((network.ifr_flags & IFF_UP) == 0){
911
network.ifr_flags |= IFF_UP;
1857
fprintf(stderr, "Mandos plugin mandos-client: "
1858
"No such interface: \"%s\"\n", interface);
1859
exitcode = EX_UNAVAILABLE;
1860
goto end;
1861
}
1862
1863
if(quit_now){
1864
goto end;
1865
}
1866
1867
/* Re-raise priviliges */
1868
errno = 0;
1869
ret = seteuid(0);
1870
if(ret == -1){
1871
perror_plus("seteuid");
1872
}
1873
1874
#ifdef __linux__
1875
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1876
messages about the network interface to mess up the prompt */
1877
ret = klogctl(8, NULL, 5);
1878
bool restore_loglevel = true;
1879
if(ret == -1){
1880
restore_loglevel = false;
1881
perror_plus("klogctl");
1882
}
1883
#endif /* __linux__ */
1884
1885
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1886
if(sd < 0){
1887
perror_plus("socket");
1888
exitcode = EX_OSERR;
1889
#ifdef __linux__
1890
if(restore_loglevel){
1891
ret = klogctl(7, NULL, 0);
1892
if(ret == -1){
1893
perror_plus("klogctl");
1894
}
1895
}
1896
#endif /* __linux__ */
1897
/* Lower privileges */
1898
errno = 0;
1899
ret = seteuid(uid);
1900
if(ret == -1){
1901
perror_plus("seteuid");
1902
}
1903
goto end;
1904
}
1905
strcpy(network.ifr_name, interface);
1906
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1907
if(ret == -1){
1908
perror_plus("ioctl SIOCGIFFLAGS");
1909
#ifdef __linux__
1910
if(restore_loglevel){
1911
ret = klogctl(7, NULL, 0);
1912
if(ret == -1){
1913
perror_plus("klogctl");
1914
}
1915
}
1916
#endif /* __linux__ */
1917
exitcode = EX_OSERR;
1918
/* Lower privileges */
1919
errno = 0;
1920
ret = seteuid(uid);
1921
if(ret == -1){
1922
perror_plus("seteuid");
1923
}
1924
goto end;
1925
}
1926
if((network.ifr_flags & IFF_UP) == 0){
1927
network.ifr_flags |= IFF_UP;
1928
take_down_interface = true;
1929
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1930
if(ret == -1){
1931
take_down_interface = false;
1932
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1933
exitcode = EX_OSERR;
1934
#ifdef __linux__
1935
if(restore_loglevel){
1936
ret = klogctl(7, NULL, 0);
1937
if(ret == -1){
1938
perror_plus("klogctl");
1939
}
1940
}
1941
#endif /* __linux__ */
1942
/* Lower privileges */
1943
errno = 0;
1944
ret = seteuid(uid);
1945
if(ret == -1){
1946
perror_plus("seteuid");
1947
}
1948
goto end;
1949
}
1950
}
1951
/* Sleep checking until interface is running.
1952
Check every 0.25s, up to total time of delay */
1953
for(int i=0; i < delay * 4; i++){
1954
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1955
if(ret == -1){
1956
perror_plus("ioctl SIOCGIFFLAGS");
1957
} else if(network.ifr_flags & IFF_RUNNING){
1958
break;
1959
}
1960
struct timespec sleeptime = { .tv_nsec = 250000000 };
1961
ret = nanosleep(&sleeptime, NULL);
1962
if(ret == -1 and errno != EINTR){
1963
perror_plus("nanosleep");
1964
}
1965
}
1966
if(not take_down_interface){
1967
/* We won't need the socket anymore */
1968
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1969
if(ret == -1){
1970
perror_plus("close");
1971
}
1972
}
1973
#ifdef __linux__
1974
if(restore_loglevel){
1975
/* Restores kernel loglevel to default */
1976
ret = klogctl(7, NULL, 0);
1977
if(ret == -1){
1978
perror_plus("klogctl");
1979
}
1980
}
1981
#endif /* __linux__ */
1982
/* Lower privileges */
1983
errno = 0;
1984
if(take_down_interface){
1985
/* Lower privileges */
1986
ret = seteuid(uid);
1987
if(ret == -1){
1988
perror_plus("seteuid");
1989
}
1990
} else {
1991
/* Lower privileges permanently */
1992
ret = setuid(uid);
1993
if(ret == -1){
1994
perror_plus("setuid");
1995
}
1996
}
1997
}
1998
1999
if(quit_now){
2000
goto end;
2001
}
2002
2003
ret = init_gnutls_global(pubkey, seckey);
2004
if(ret == -1){
2005
fprintf(stderr, "Mandos plugin mandos-client: "
2006
"init_gnutls_global failed\n");
2007
exitcode = EX_UNAVAILABLE;
2008
goto end;
2009
} else {
2010
gnutls_initialized = true;
2011
}
2012
2013
if(quit_now){
2014
goto end;
2015
}
2016
2017
if(mkdtemp(tempdir) == NULL){
2018
perror_plus("mkdtemp");
2019
goto end;
2020
}
2021
tempdir_created = true;
2022
2023
if(quit_now){
2024
goto end;
2025
}
2026
2027
if(not init_gpgme(pubkey, seckey, tempdir)){
2028
fprintf(stderr, "Mandos plugin mandos-client: "
2029
"init_gpgme failed\n");
2030
exitcode = EX_UNAVAILABLE;
2031
goto end;
2032
} else {
2033
gpgme_initialized = true;
2034
}
2035
2036
if(quit_now){
2037
goto end;
2038
}
2039
2040
if(connect_to != NULL){
2041
/* Connect directly, do not use Zeroconf */
2042
/* (Mainly meant for debugging) */
2043
char *address = strrchr(connect_to, ':');
2044
if(address == NULL){
2045
fprintf(stderr, "Mandos plugin mandos-client: "
2046
"No colon in address\n");
2047
exitcode = EX_USAGE;
2048
goto end;
2049
}
2050
2051
if(quit_now){
2052
goto end;
2053
}
2054
2055
uint16_t port;
2056
errno = 0;
2057
tmpmax = strtoimax(address+1, &tmp, 10);
2058
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2059
or tmpmax != (uint16_t)tmpmax){
2060
fprintf(stderr, "Mandos plugin mandos-client: "
2061
"Bad port number\n");
2062
exitcode = EX_USAGE;
2063
goto end;
2064
}
2065
2066
if(quit_now){
2067
goto end;
2068
}
2069
2070
port = (uint16_t)tmpmax;
2071
*address = '\0';
2072
/* Colon in address indicates IPv6 */
2073
int af;
2074
if(strchr(connect_to, ':') != NULL){
2075
af = AF_INET6;
2076
/* Accept [] around IPv6 address - see RFC 5952 */
2077
if(connect_to[0] == '[' and address[-1] == ']')
2078
{
2079
connect_to++;
2080
address[-1] = '\0';
2081
}
2082
} else {
2083
af = AF_INET;
2084
}
2085
address = connect_to;
2086
2087
if(quit_now){
2088
goto end;
2089
}
2090
2091
while(not quit_now){
2092
ret = start_mandos_communication(address, port, if_index, af);
2093
if(quit_now or ret == 0){
2094
break;
2095
}
2096
if(debug){
2097
fprintf(stderr, "Mandos plugin mandos-client: "
2098
"Retrying in %d seconds\n", (int)retry_interval);
2099
}
2100
sleep((int)retry_interval);
2101
}
2102
2103
if (not quit_now){
2104
exitcode = EXIT_SUCCESS;
2105
}
2106
2107
goto end;
2108
}
2109
2110
if(quit_now){
2111
goto end;
2112
}
2113
2114
{
2115
AvahiServerConfig config;
2116
/* Do not publish any local Zeroconf records */
2117
avahi_server_config_init(&config);
2118
config.publish_hinfo = 0;
2119
config.publish_addresses = 0;
2120
config.publish_workstation = 0;
2121
config.publish_domain = 0;
2122
2123
/* Allocate a new server */
2124
mc.server = avahi_server_new(avahi_simple_poll_get
2125
(mc.simple_poll), &config, NULL,
2126
NULL, &error);
2127
2128
/* Free the Avahi configuration data */
2129
avahi_server_config_free(&config);
2130
}
2131
2132
/* Check if creating the Avahi server object succeeded */
2133
if(mc.server == NULL){
2134
fprintf(stderr, "Mandos plugin mandos-client: "
2135
"Failed to create Avahi server: %s\n",
2136
avahi_strerror(error));
2137
exitcode = EX_UNAVAILABLE;
2138
goto end;
2139
}
2140
2141
if(quit_now){
2142
goto end;
2143
}
2144
2145
/* Create the Avahi service browser */
2146
sb = avahi_s_service_browser_new(mc.server, if_index,
2147
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2148
NULL, 0, browse_callback, NULL);
2149
if(sb == NULL){
2150
fprintf(stderr, "Mandos plugin mandos-client: "
2151
"Failed to create service browser: %s\n",
2152
avahi_strerror(avahi_server_errno(mc.server)));
2153
exitcode = EX_UNAVAILABLE;
2154
goto end;
2155
}
2156
2157
if(quit_now){
2158
goto end;
2159
}
2160
2161
/* Run the main loop */
2162
2163
if(debug){
2164
fprintf(stderr, "Mandos plugin mandos-client: "
2165
"Starting Avahi loop search\n");
2166
}
2167
2168
ret = avahi_loop_with_timeout(mc.simple_poll,
2169
(int)(retry_interval * 1000));
2170
if(debug){
2171
fprintf(stderr, "Mandos plugin mandos-client: "
2172
"avahi_loop_with_timeout exited %s\n",
2173
(ret == 0) ? "successfully" : "with error");
2174
}
2175
2176
end:
2177
2178
if(debug){
2179
fprintf(stderr, "Mandos plugin mandos-client: "
2180
"%s exiting\n", argv[0]);
2181
}
2182
2183
/* Cleanup things */
2184
if(sb != NULL)
2185
avahi_s_service_browser_free(sb);
2186
2187
if(mc.server != NULL)
2188
avahi_server_free(mc.server);
2189
2190
if(mc.simple_poll != NULL)
2191
avahi_simple_poll_free(mc.simple_poll);
2192
2193
if(gnutls_initialized){
2194
gnutls_certificate_free_credentials(mc.cred);
2195
gnutls_global_deinit();
2196
gnutls_dh_params_deinit(mc.dh_params);
2197
}
2198
2199
if(gpgme_initialized){
2200
gpgme_release(mc.ctx);
2201
}
2202
2203
/* Cleans up the circular linked list of Mandos servers the client
2204
has seen */
2205
if(mc.current_server != NULL){
2206
mc.current_server->prev->next = NULL;
2207
while(mc.current_server != NULL){
2208
server *next = mc.current_server->next;
2209
free(mc.current_server);
2210
mc.current_server = next;
2211
}
2212
}
2213
2214
/* XXX run network hooks "stop" here */
2215
2216
/* Take down the network interface */
2217
if(take_down_interface){
2218
/* Re-raise priviliges */
2219
errno = 0;
2220
ret = seteuid(0);
2221
if(ret == -1){
2222
perror_plus("seteuid");
2223
}
2224
if(geteuid() == 0){
2225
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2226
if(ret == -1){
2227
perror_plus("ioctl SIOCGIFFLAGS");
2228
} else if(network.ifr_flags & IFF_UP){
2229
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
912
2230
ret = ioctl(sd, SIOCSIFFLAGS, &network);
913
2231
if(ret == -1){
914
perror("ioctl SIOCSIFFLAGS");
915
exitcode = EXIT_FAILURE;
916
goto end;
917
}
918
}
919
close(sd);
920
}
921
922
if (not debug){
923
avahi_set_log_function(empty_log);
924
}
925
926
/* Initialize the pseudo-RNG for Avahi */
927
srand((unsigned int) time(NULL));
928
929
/* Allocate main Avahi loop object */
930
mc.simple_poll = avahi_simple_poll_new();
931
if (mc.simple_poll == NULL) {
932
fprintf(stderr, "Avahi: Failed to create simple poll"
933
" object.\n");
934
exitcode = EXIT_FAILURE;
935
goto end;
936
}
937
938
{
939
AvahiServerConfig config;
940
/* Do not publish any local Zeroconf records */
941
avahi_server_config_init(&config);
942
config.publish_hinfo = 0;
943
config.publish_addresses = 0;
944
config.publish_workstation = 0;
945
config.publish_domain = 0;
946
947
/* Allocate a new server */
948
mc.server = avahi_server_new(avahi_simple_poll_get
949
(mc.simple_poll), &config, NULL,
950
NULL, &error);
951
952
/* Free the Avahi configuration data */
953
avahi_server_config_free(&config);
954
}
955
956
/* Check if creating the Avahi server object succeeded */
957
if (mc.server == NULL) {
958
fprintf(stderr, "Failed to create Avahi server: %s\n",
959
avahi_strerror(error));
960
exitcode = EXIT_FAILURE;
961
goto end;
962
}
963
964
/* Create the Avahi service browser */
965
sb = avahi_s_service_browser_new(mc.server, if_index,
966
AVAHI_PROTO_INET6,
967
"_mandos._tcp", NULL, 0,
968
browse_callback, &mc);
969
if (sb == NULL) {
970
fprintf(stderr, "Failed to create service browser: %s\n",
971
avahi_strerror(avahi_server_errno(mc.server)));
972
exitcode = EXIT_FAILURE;
973
goto end;
974
}
975
976
/* Run the main loop */
977
978
if (debug){
979
fprintf(stderr, "Starting Avahi loop search\n");
980
}
981
982
avahi_simple_poll_loop(mc.simple_poll);
983
984
end:
985
986
if (debug){
987
fprintf(stderr, "%s exiting\n", argv[0]);
988
}
989
990
/* Cleanup things */
991
if (sb != NULL)
992
avahi_s_service_browser_free(sb);
993
994
if (mc.server != NULL)
995
avahi_server_free(mc.server);
996
997
if (mc.simple_poll != NULL)
998
avahi_simple_poll_free(mc.simple_poll);
999
free(pubkeyfile);
1000
free(seckeyfile);
1001
1002
return exitcode;
2232
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2233
}
2234
}
2235
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2236
if(ret == -1){
2237
perror_plus("close");
2238
}
2239
/* Lower privileges permanently */
2240
errno = 0;
2241
ret = setuid(uid);
2242
if(ret == -1){
2243
perror_plus("setuid");
2244
}
2245
}
2246
}
2247
2248
/* Removes the GPGME temp directory and all files inside */
2249
if(tempdir_created){
2250
struct dirent **direntries = NULL;
2251
struct dirent *direntry = NULL;
2252
int numentries = scandir(tempdir, &direntries, notdotentries,
2253
alphasort);
2254
if (numentries > 0){
2255
for(int i = 0; i < numentries; i++){
2256
direntry = direntries[i];
2257
char *fullname = NULL;
2258
ret = asprintf(&fullname, "%s/%s", tempdir,
2259
direntry->d_name);
2260
if(ret < 0){
2261
perror_plus("asprintf");
2262
continue;
2263
}
2264
ret = remove(fullname);
2265
if(ret == -1){
2266
fprintf(stderr, "Mandos plugin mandos-client: "
2267
"remove(\"%s\"): %s\n", fullname, strerror(errno));
2268
}
2269
free(fullname);
2270
}
2271
}
2272
2273
/* need to clean even if 0 because man page doesn't specify */
2274
free(direntries);
2275
if (numentries == -1){
2276
perror_plus("scandir");
2277
}
2278
ret = rmdir(tempdir);
2279
if(ret == -1 and errno != ENOENT){
2280
perror_plus("rmdir");
2281
}
2282
}
2283
2284
if(quit_now){
2285
sigemptyset(&old_sigterm_action.sa_mask);
2286
old_sigterm_action.sa_handler = SIG_DFL;
2287
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2288
&old_sigterm_action,
2289
NULL));
2290
if(ret == -1){
2291
perror_plus("sigaction");
2292
}
2293
do {
2294
ret = raise(signal_received);
2295
} while(ret != 0 and errno == EINTR);
2296
if(ret != 0){
2297
perror_plus("raise");
2298
abort();
2299
}
2300
TEMP_FAILURE_RETRY(pause());
2301
}
2302
2303
return exitcode;
1003
2304
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0