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- Committer: Teddy Hogeborn
- Date: 2011-11-27 02:32:20 UTC
- mto: (505.2.10 mandos-client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 525.
- Revision ID: teddy@recompile.se-20111127023220-bih6el7s0q6jhtci
* debian/mandos-client.README.Debian: Document network hook facility.
* debian/mandos-client.docs (network-hooks.d): Added.
* initramfs-tools-hook: Also pass VERBOSITY to network hook.
* plugins.d/mandos-client.xml (DESCRIPTION): Document network
interface selection
algorithm.
(OPTIONS/--interface): Refer to NETWORK HOOKS section.
(OVERVIEW): Refer to password-prompt(8mandos) explicitly.
(NETWORK HOOKS): New section.
(FILES): Add "/lib/mandos/network-hooks.d".
* debian/mandos-client.docs (network-hooks.d): Added.
* initramfs-tools-hook: Also pass VERBOSITY to network hook.
* plugins.d/mandos-client.xml (DESCRIPTION): Document network
interface selection
algorithm.
(OPTIONS/--interface): Refer to NETWORK HOOKS section.
(OVERVIEW): Refer to password-prompt(8mandos) explicitly.
(NETWORK HOOKS): New section.
(FILES): Add "/lib/mandos/network-hooks.d".
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- network-hooks.d
- 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
#include <stdio.h>
36
#include <assert.h>
37
#include <stdlib.h>
38
#include <time.h>
39
#include <net/if.h> /* if_nametoindex */
40
#include <sys/ioctl.h> // ioctl, ifreq, SIOCGIFFLAGS, IFF_UP, SIOCSIFFLAGS
41
#include <net/if.h> // ioctl, ifreq, SIOCGIFFLAGS, IFF_UP, SIOCSIFFLAGS
42
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,
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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_* */
43
99
#include <avahi-core/core.h>
44
100
#include <avahi-core/lookup.h>
45
101
#include <avahi-core/log.h>
47
103
#include <avahi-common/malloc.h>
48
104
#include <avahi-common/error.h>
49
105
50
//mandos client part
51
#include <sys/types.h> /* socket(), inet_pton() */
52
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
53
struct in6_addr, inet_pton() */
54
#include <gnutls/gnutls.h> /* All GnuTLS stuff */
55
#include <gnutls/openpgp.h> /* GnuTLS with openpgp stuff */
56
57
#include <unistd.h> /* close() */
58
#include <netinet/in.h>
59
#include <stdbool.h> /* true */
60
#include <string.h> /* memset */
61
#include <arpa/inet.h> /* inet_pton() */
62
#include <iso646.h> /* not */
63
64
// gpgme
65
#include <errno.h> /* perror() */
66
#include <gpgme.h>
67
68
// getopt_long
69
#include <getopt.h>
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_* */
70
122
71
123
#define BUFFER_SIZE 256
72
124
73
static const char *keydir = "/conf/conf.d/mandos";
74
static const char *pubkeyfile = "pubkey.txt";
75
static const char *seckeyfile = "seckey.txt";
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"
76
129
77
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bool debug = false;
78
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/* Used for passing in values through all the callback functions */
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 */
80
150
typedef struct {
81
151
AvahiSimplePoll *simple_poll;
82
152
AvahiServer *server;
83
153
gnutls_certificate_credentials_t cred;
84
154
unsigned int dh_bits;
155
gnutls_dh_params_t dh_params;
85
156
const char *priority;
157
gpgme_ctx_t ctx;
158
server *current_server;
86
159
} mandos_context;
87
160
88
static ssize_t pgp_packet_decrypt (char *packet, size_t packet_size,
89
char **new_packet,
90
const char *homedir){
91
gpgme_data_t dh_crypto, dh_plain;
92
gpgme_ctx_t ctx;
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: ",
182
program_invocation_short_name));
183
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
184
}
185
186
/*
187
* Make additional room in "buffer" for at least BUFFER_SIZE more
188
* bytes. "buffer_capacity" is how much is currently allocated,
189
* "buffer_length" is how much is already used.
190
*/
191
size_t incbuffer(char **buffer, size_t buffer_length,
192
size_t buffer_capacity){
193
if(buffer_length + BUFFER_SIZE > buffer_capacity){
194
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
195
if(buffer == NULL){
196
return 0;
197
}
198
buffer_capacity += BUFFER_SIZE;
199
}
200
return buffer_capacity;
201
}
202
203
/* Add server to set of servers to retry periodically */
204
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
205
int af){
206
int ret;
207
server *new_server = malloc(sizeof(server));
208
if(new_server == NULL){
209
perror_plus("malloc");
210
return -1;
211
}
212
*new_server = (server){ .ip = strdup(ip),
213
.port = port,
214
.if_index = if_index,
215
.af = af };
216
if(new_server->ip == NULL){
217
perror_plus("strdup");
218
return -1;
219
}
220
/* Special case of first server */
221
if (mc.current_server == NULL){
222
new_server->next = new_server;
223
new_server->prev = new_server;
224
mc.current_server = new_server;
225
/* Place the new server last in the list */
226
} else {
227
new_server->next = mc.current_server;
228
new_server->prev = mc.current_server->prev;
229
new_server->prev->next = new_server;
230
mc.current_server->prev = new_server;
231
}
232
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
233
if(ret == -1){
234
perror_plus("clock_gettime");
235
return -1;
236
}
237
return 0;
238
}
239
240
/*
241
* Initialize GPGME.
242
*/
243
static bool init_gpgme(const char *seckey, const char *pubkey,
244
const char *tempdir){
93
245
gpgme_error_t rc;
94
ssize_t ret;
95
ssize_t new_packet_capacity = 0;
96
ssize_t new_packet_length = 0;
97
246
gpgme_engine_info_t engine_info;
98
99
if (debug){
100
fprintf(stderr, "Trying to decrypt OpenPGP packet\n");
247
248
249
/*
250
* Helper function to insert pub and seckey to the engine keyring.
251
*/
252
bool import_key(const char *filename){
253
int ret;
254
int fd;
255
gpgme_data_t pgp_data;
256
257
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
258
if(fd == -1){
259
perror_plus("open");
260
return false;
261
}
262
263
rc = gpgme_data_new_from_fd(&pgp_data, fd);
264
if(rc != GPG_ERR_NO_ERROR){
265
fprintf_plus(stderr, "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_plus(stderr, "bad gpgme_op_import: %s: %s\n",
273
gpgme_strsource(rc), gpgme_strerror(rc));
274
return false;
275
}
276
277
ret = (int)TEMP_FAILURE_RETRY(close(fd));
278
if(ret == -1){
279
perror_plus("close");
280
}
281
gpgme_data_release(pgp_data);
282
return true;
283
}
284
285
if(debug){
286
fprintf_plus(stderr, "Initializing GPGME\n");
101
287
}
102
288
103
289
/* Init GPGME */
104
290
gpgme_check_version(NULL);
105
291
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
106
if (rc != GPG_ERR_NO_ERROR){
107
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
108
gpgme_strsource(rc), gpgme_strerror(rc));
109
return -1;
292
if(rc != GPG_ERR_NO_ERROR){
293
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
294
gpgme_strsource(rc), gpgme_strerror(rc));
295
return false;
110
296
}
111
297
112
/* Set GPGME home directory */
113
rc = gpgme_get_engine_info (&engine_info);
114
if (rc != GPG_ERR_NO_ERROR){
115
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
116
gpgme_strsource(rc), gpgme_strerror(rc));
117
return -1;
298
/* Set GPGME home directory for the OpenPGP engine only */
299
rc = gpgme_get_engine_info(&engine_info);
300
if(rc != GPG_ERR_NO_ERROR){
301
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
302
gpgme_strsource(rc), gpgme_strerror(rc));
303
return false;
118
304
}
119
305
while(engine_info != NULL){
120
306
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
121
307
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
122
engine_info->file_name, homedir);
308
engine_info->file_name, tempdir);
123
309
break;
124
310
}
125
311
engine_info = engine_info->next;
126
312
}
127
313
if(engine_info == NULL){
128
fprintf(stderr, "Could not set home dir to %s\n", homedir);
129
return -1;
130
}
131
132
/* Create new GPGME data buffer from packet buffer */
133
rc = gpgme_data_new_from_mem(&dh_crypto, packet, packet_size, 0);
134
if (rc != GPG_ERR_NO_ERROR){
135
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
136
gpgme_strsource(rc), gpgme_strerror(rc));
314
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
315
tempdir);
316
return false;
317
}
318
319
/* Create new GPGME "context" */
320
rc = gpgme_new(&(mc.ctx));
321
if(rc != GPG_ERR_NO_ERROR){
322
fprintf_plus(stderr, "Mandos plugin mandos-client: "
323
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
324
gpgme_strerror(rc));
325
return false;
326
}
327
328
if(not import_key(pubkey) or not import_key(seckey)){
329
return false;
330
}
331
332
return true;
333
}
334
335
/*
336
* Decrypt OpenPGP data.
337
* Returns -1 on error
338
*/
339
static ssize_t pgp_packet_decrypt(const char *cryptotext,
340
size_t crypto_size,
341
char **plaintext){
342
gpgme_data_t dh_crypto, dh_plain;
343
gpgme_error_t rc;
344
ssize_t ret;
345
size_t plaintext_capacity = 0;
346
ssize_t plaintext_length = 0;
347
348
if(debug){
349
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
350
}
351
352
/* Create new GPGME data buffer from memory cryptotext */
353
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
354
0);
355
if(rc != GPG_ERR_NO_ERROR){
356
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
357
gpgme_strsource(rc), gpgme_strerror(rc));
137
358
return -1;
138
359
}
139
360
140
361
/* Create new empty GPGME data buffer for the plaintext */
141
362
rc = gpgme_data_new(&dh_plain);
142
if (rc != GPG_ERR_NO_ERROR){
143
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
144
gpgme_strsource(rc), gpgme_strerror(rc));
145
return -1;
146
}
147
148
/* Create new GPGME "context" */
149
rc = gpgme_new(&ctx);
150
if (rc != GPG_ERR_NO_ERROR){
151
fprintf(stderr, "bad gpgme_new: %s: %s\n",
152
gpgme_strsource(rc), gpgme_strerror(rc));
153
return -1;
154
}
155
156
/* Decrypt data from the FILE pointer to the plaintext data
157
buffer */
158
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
159
if (rc != GPG_ERR_NO_ERROR){
160
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
161
gpgme_strsource(rc), gpgme_strerror(rc));
162
return -1;
163
}
164
165
if(debug){
166
fprintf(stderr, "Decryption of OpenPGP packet succeeded\n");
167
}
168
169
if (debug){
170
gpgme_decrypt_result_t result;
171
result = gpgme_op_decrypt_result(ctx);
172
if (result == NULL){
173
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
174
} else {
175
fprintf(stderr, "Unsupported algorithm: %s\n",
176
result->unsupported_algorithm);
177
fprintf(stderr, "Wrong key usage: %d\n",
178
result->wrong_key_usage);
179
if(result->file_name != NULL){
180
fprintf(stderr, "File name: %s\n", result->file_name);
181
}
182
gpgme_recipient_t recipient;
183
recipient = result->recipients;
184
if(recipient){
363
if(rc != GPG_ERR_NO_ERROR){
364
fprintf_plus(stderr, "Mandos plugin mandos-client: "
365
"bad gpgme_data_new: %s: %s\n",
366
gpgme_strsource(rc), gpgme_strerror(rc));
367
gpgme_data_release(dh_crypto);
368
return -1;
369
}
370
371
/* Decrypt data from the cryptotext data buffer to the plaintext
372
data buffer */
373
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
374
if(rc != GPG_ERR_NO_ERROR){
375
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
376
gpgme_strsource(rc), gpgme_strerror(rc));
377
plaintext_length = -1;
378
if(debug){
379
gpgme_decrypt_result_t result;
380
result = gpgme_op_decrypt_result(mc.ctx);
381
if(result == NULL){
382
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
383
} else {
384
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
385
result->unsupported_algorithm);
386
fprintf_plus(stderr, "Wrong key usage: %u\n",
387
result->wrong_key_usage);
388
if(result->file_name != NULL){
389
fprintf_plus(stderr, "File name: %s\n", result->file_name);
390
}
391
gpgme_recipient_t recipient;
392
recipient = result->recipients;
185
393
while(recipient != NULL){
186
fprintf(stderr, "Public key algorithm: %s\n",
187
gpgme_pubkey_algo_name(recipient->pubkey_algo));
188
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
189
fprintf(stderr, "Secret key available: %s\n",
190
recipient->status == GPG_ERR_NO_SECKEY
191
? "No" : "Yes");
394
fprintf_plus(stderr, "Public key algorithm: %s\n",
395
gpgme_pubkey_algo_name
396
(recipient->pubkey_algo));
397
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
398
fprintf_plus(stderr, "Secret key available: %s\n",
399
recipient->status == GPG_ERR_NO_SECKEY
400
? "No" : "Yes");
192
401
recipient = recipient->next;
193
402
}
194
403
}
195
404
}
405
goto decrypt_end;
196
406
}
197
407
198
/* Delete the GPGME FILE pointer cryptotext data buffer */
199
gpgme_data_release(dh_crypto);
408
if(debug){
409
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
410
}
200
411
201
412
/* Seek back to the beginning of the GPGME plaintext data buffer */
202
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
203
perror("pgpme_data_seek");
413
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
414
perror_plus("gpgme_data_seek");
415
plaintext_length = -1;
416
goto decrypt_end;
204
417
}
205
418
206
*new_packet = 0;
419
*plaintext = NULL;
207
420
while(true){
208
if (new_packet_length + BUFFER_SIZE > new_packet_capacity){
209
*new_packet = realloc(*new_packet,
210
(unsigned int)new_packet_capacity
211
+ BUFFER_SIZE);
212
if (*new_packet == NULL){
213
perror("realloc");
214
return -1;
215
}
216
new_packet_capacity += BUFFER_SIZE;
421
plaintext_capacity = incbuffer(plaintext,
422
(size_t)plaintext_length,
423
plaintext_capacity);
424
if(plaintext_capacity == 0){
425
perror_plus("incbuffer");
426
plaintext_length = -1;
427
goto decrypt_end;
217
428
}
218
429
219
ret = gpgme_data_read(dh_plain, *new_packet + new_packet_length,
430
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
220
431
BUFFER_SIZE);
221
432
/* Print the data, if any */
222
if (ret == 0){
433
if(ret == 0){
434
/* EOF */
223
435
break;
224
436
}
225
437
if(ret < 0){
226
perror("gpgme_data_read");
227
return -1;
228
}
229
new_packet_length += ret;
230
}
231
232
/* FIXME: check characters before printing to screen so to not print
233
terminal control characters */
234
/* if(debug){ */
235
/* fprintf(stderr, "decrypted password is: "); */
236
/* fwrite(*new_packet, 1, new_packet_length, stderr); */
237
/* fprintf(stderr, "\n"); */
238
/* } */
438
perror_plus("gpgme_data_read");
439
plaintext_length = -1;
440
goto decrypt_end;
441
}
442
plaintext_length += ret;
443
}
444
445
if(debug){
446
fprintf_plus(stderr, "Decrypted password is: ");
447
for(ssize_t i = 0; i < plaintext_length; i++){
448
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
449
}
450
fprintf(stderr, "\n");
451
}
452
453
decrypt_end:
454
455
/* Delete the GPGME cryptotext data buffer */
456
gpgme_data_release(dh_crypto);
239
457
240
458
/* Delete the GPGME plaintext data buffer */
241
459
gpgme_data_release(dh_plain);
242
return new_packet_length;
460
return plaintext_length;
243
461
}
244
462
245
static const char * safer_gnutls_strerror (int value) {
246
const char *ret = gnutls_strerror (value);
247
if (ret == NULL)
463
static const char * safer_gnutls_strerror(int value){
464
const char *ret = gnutls_strerror(value); /* Spurious warning from
465
-Wunreachable-code */
466
if(ret == NULL)
248
467
ret = "(unknown)";
249
468
return ret;
250
469
}
251
470
471
/* GnuTLS log function callback */
252
472
static void debuggnutls(__attribute__((unused)) int level,
253
473
const char* string){
254
fprintf(stderr, "%s", string);
474
fprintf_plus(stderr, "GnuTLS: %s", string);
255
475
}
256
476
257
static int initgnutls(mandos_context *mc, gnutls_session_t *session,
258
gnutls_dh_params_t *dh_params){
259
const char *err;
477
static int init_gnutls_global(const char *pubkeyfilename,
478
const char *seckeyfilename){
260
479
int ret;
261
480
262
481
if(debug){
263
fprintf(stderr, "Initializing GnuTLS\n");
482
fprintf_plus(stderr, "Initializing GnuTLS\n");
264
483
}
265
266
if ((ret = gnutls_global_init ())
267
!= GNUTLS_E_SUCCESS) {
268
fprintf (stderr, "global_init: %s\n", safer_gnutls_strerror(ret));
484
485
ret = gnutls_global_init();
486
if(ret != GNUTLS_E_SUCCESS){
487
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
488
safer_gnutls_strerror(ret));
269
489
return -1;
270
490
}
271
491
272
if (debug){
492
if(debug){
493
/* "Use a log level over 10 to enable all debugging options."
494
* - GnuTLS manual
495
*/
273
496
gnutls_global_set_log_level(11);
274
497
gnutls_global_set_log_function(debuggnutls);
275
498
}
276
499
277
/* openpgp credentials */
278
if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))
279
!= GNUTLS_E_SUCCESS) {
280
fprintf (stderr, "memory error: %s\n",
281
safer_gnutls_strerror(ret));
500
/* OpenPGP credentials */
501
ret = gnutls_certificate_allocate_credentials(&mc.cred);
502
if(ret != GNUTLS_E_SUCCESS){
503
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
504
safer_gnutls_strerror(ret));
505
gnutls_global_deinit();
282
506
return -1;
283
507
}
284
508
285
509
if(debug){
286
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
287
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
288
seckeyfile);
510
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
511
" secret key %s as GnuTLS credentials\n",
512
pubkeyfilename,
513
seckeyfilename);
289
514
}
290
515
291
516
ret = gnutls_certificate_set_openpgp_key_file
292
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
293
if (ret != GNUTLS_E_SUCCESS) {
294
fprintf
295
(stderr, "Error[%d] while reading the OpenPGP key pair ('%s',"
296
" '%s')\n",
297
ret, pubkeyfile, seckeyfile);
298
fprintf(stdout, "The Error is: %s\n",
299
safer_gnutls_strerror(ret));
300
return -1;
301
}
302
303
//GnuTLS server initialization
304
if ((ret = gnutls_dh_params_init(dh_params))
305
!= GNUTLS_E_SUCCESS) {
306
fprintf (stderr, "Error in dh parameter initialization: %s\n",
307
safer_gnutls_strerror(ret));
308
return -1;
309
}
310
311
if ((ret = gnutls_dh_params_generate2(*dh_params, mc->dh_bits))
312
!= GNUTLS_E_SUCCESS) {
313
fprintf (stderr, "Error in prime generation: %s\n",
314
safer_gnutls_strerror(ret));
315
return -1;
316
}
317
318
gnutls_certificate_set_dh_params(mc->cred, *dh_params);
319
320
// GnuTLS session creation
321
if ((ret = gnutls_init(session, GNUTLS_SERVER))
322
!= GNUTLS_E_SUCCESS){
323
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
324
safer_gnutls_strerror(ret));
325
}
326
327
if ((ret = gnutls_priority_set_direct(*session, mc->priority, &err))
328
!= GNUTLS_E_SUCCESS) {
329
fprintf(stderr, "Syntax error at: %s\n", err);
330
fprintf(stderr, "GnuTLS error: %s\n",
331
safer_gnutls_strerror(ret));
332
return -1;
333
}
334
335
if ((ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
336
mc->cred))
337
!= GNUTLS_E_SUCCESS) {
338
fprintf(stderr, "Error setting a credentials set: %s\n",
339
safer_gnutls_strerror(ret));
517
(mc.cred, pubkeyfilename, seckeyfilename,
518
GNUTLS_OPENPGP_FMT_BASE64);
519
if(ret != GNUTLS_E_SUCCESS){
520
fprintf_plus(stderr,
521
"Error[%d] while reading the OpenPGP key pair ('%s',"
522
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
523
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
524
safer_gnutls_strerror(ret));
525
goto globalfail;
526
}
527
528
/* GnuTLS server initialization */
529
ret = gnutls_dh_params_init(&mc.dh_params);
530
if(ret != GNUTLS_E_SUCCESS){
531
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
532
" initialization: %s\n",
533
safer_gnutls_strerror(ret));
534
goto globalfail;
535
}
536
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
537
if(ret != GNUTLS_E_SUCCESS){
538
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
539
safer_gnutls_strerror(ret));
540
goto globalfail;
541
}
542
543
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
544
545
return 0;
546
547
globalfail:
548
549
gnutls_certificate_free_credentials(mc.cred);
550
gnutls_global_deinit();
551
gnutls_dh_params_deinit(mc.dh_params);
552
return -1;
553
}
554
555
static int init_gnutls_session(gnutls_session_t *session){
556
int ret;
557
/* GnuTLS session creation */
558
do {
559
ret = gnutls_init(session, GNUTLS_SERVER);
560
if(quit_now){
561
return -1;
562
}
563
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
564
if(ret != GNUTLS_E_SUCCESS){
565
fprintf_plus(stderr,
566
"Error in GnuTLS session initialization: %s\n",
567
safer_gnutls_strerror(ret));
568
}
569
570
{
571
const char *err;
572
do {
573
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
574
if(quit_now){
575
gnutls_deinit(*session);
576
return -1;
577
}
578
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
579
if(ret != GNUTLS_E_SUCCESS){
580
fprintf_plus(stderr, "Syntax error at: %s\n", err);
581
fprintf_plus(stderr, "GnuTLS error: %s\n",
582
safer_gnutls_strerror(ret));
583
gnutls_deinit(*session);
584
return -1;
585
}
586
}
587
588
do {
589
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
590
mc.cred);
591
if(quit_now){
592
gnutls_deinit(*session);
593
return -1;
594
}
595
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
596
if(ret != GNUTLS_E_SUCCESS){
597
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
598
safer_gnutls_strerror(ret));
599
gnutls_deinit(*session);
340
600
return -1;
341
601
}
342
602
343
603
/* ignore client certificate if any. */
344
gnutls_certificate_server_set_request (*session,
345
GNUTLS_CERT_IGNORE);
604
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
346
605
347
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
606
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
348
607
349
608
return 0;
350
609
}
351
610
611
/* Avahi log function callback */
352
612
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
353
613
__attribute__((unused)) const char *txt){}
354
614
615
/* Called when a Mandos server is found */
355
616
static int start_mandos_communication(const char *ip, uint16_t port,
356
617
AvahiIfIndex if_index,
357
mandos_context *mc){
358
int ret, tcp_sd;
359
struct sockaddr_in6 to;
618
int af){
619
int ret, tcp_sd = -1;
620
ssize_t sret;
621
union {
622
struct sockaddr_in in;
623
struct sockaddr_in6 in6;
624
} to;
360
625
char *buffer = NULL;
361
char *decrypted_buffer;
626
char *decrypted_buffer = NULL;
362
627
size_t buffer_length = 0;
363
628
size_t buffer_capacity = 0;
364
ssize_t decrypted_buffer_size;
365
size_t written = 0;
366
int retval = 0;
367
char interface[IF_NAMESIZE];
629
size_t written;
630
int retval = -1;
368
631
gnutls_session_t session;
369
gnutls_dh_params_t dh_params;
370
371
if(debug){
372
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
373
ip, port);
374
}
375
376
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
377
if(tcp_sd < 0) {
378
perror("socket");
379
return -1;
380
}
381
382
if(debug){
383
if(if_indextoname((unsigned int)if_index, interface) == NULL){
384
perror("if_indextoname");
385
return -1;
386
}
387
fprintf(stderr, "Binding to interface %s\n", interface);
388
}
389
390
memset(&to,0,sizeof(to)); /* Spurious warning */
391
to.sin6_family = AF_INET6;
392
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
393
if (ret < 0 ){
394
perror("inet_pton");
395
return -1;
632
int pf; /* Protocol family */
633
634
errno = 0;
635
636
if(quit_now){
637
errno = EINTR;
638
return -1;
639
}
640
641
switch(af){
642
case AF_INET6:
643
pf = PF_INET6;
644
break;
645
case AF_INET:
646
pf = PF_INET;
647
break;
648
default:
649
fprintf_plus(stderr, "Bad address family: %d\n", af);
650
errno = EINVAL;
651
return -1;
652
}
653
654
ret = init_gnutls_session(&session);
655
if(ret != 0){
656
return -1;
657
}
658
659
if(debug){
660
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
661
PRIu16 "\n", ip, port);
662
}
663
664
tcp_sd = socket(pf, SOCK_STREAM, 0);
665
if(tcp_sd < 0){
666
int e = errno;
667
perror_plus("socket");
668
errno = e;
669
goto mandos_end;
670
}
671
672
if(quit_now){
673
errno = EINTR;
674
goto mandos_end;
675
}
676
677
memset(&to, 0, sizeof(to));
678
if(af == AF_INET6){
679
to.in6.sin6_family = (sa_family_t)af;
680
ret = inet_pton(af, ip, &to.in6.sin6_addr);
681
} else { /* IPv4 */
682
to.in.sin_family = (sa_family_t)af;
683
ret = inet_pton(af, ip, &to.in.sin_addr);
684
}
685
if(ret < 0 ){
686
int e = errno;
687
perror_plus("inet_pton");
688
errno = e;
689
goto mandos_end;
396
690
}
397
691
if(ret == 0){
398
fprintf(stderr, "Bad address: %s\n", ip);
399
return -1;
400
}
401
to.sin6_port = htons(port); /* Spurious warning */
692
int e = errno;
693
fprintf_plus(stderr, "Bad address: %s\n", ip);
694
errno = e;
695
goto mandos_end;
696
}
697
if(af == AF_INET6){
698
to.in6.sin6_port = htons(port); /* Spurious warnings from
699
-Wconversion and
700
-Wunreachable-code */
701
702
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
703
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
704
-Wunreachable-code*/
705
if(if_index == AVAHI_IF_UNSPEC){
706
fprintf_plus(stderr, "An IPv6 link-local address is"
707
" incomplete without a network interface\n");
708
errno = EINVAL;
709
goto mandos_end;
710
}
711
/* Set the network interface number as scope */
712
to.in6.sin6_scope_id = (uint32_t)if_index;
713
}
714
} else {
715
to.in.sin_port = htons(port); /* Spurious warnings from
716
-Wconversion and
717
-Wunreachable-code */
718
}
402
719
403
to.sin6_scope_id = (uint32_t)if_index;
720
if(quit_now){
721
errno = EINTR;
722
goto mandos_end;
723
}
404
724
405
725
if(debug){
406
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
407
char addrstr[INET6_ADDRSTRLEN] = "";
408
if(inet_ntop(to.sin6_family, &(to.sin6_addr), addrstr,
409
sizeof(addrstr)) == NULL){
410
perror("inet_ntop");
726
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
727
char interface[IF_NAMESIZE];
728
if(if_indextoname((unsigned int)if_index, interface) == NULL){
729
perror_plus("if_indextoname");
730
} else {
731
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
732
"\n", ip, interface, port);
733
}
734
} else {
735
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
736
ip, port);
737
}
738
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
739
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
740
const char *pcret;
741
if(af == AF_INET6){
742
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
743
sizeof(addrstr));
744
} else {
745
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
746
sizeof(addrstr));
747
}
748
if(pcret == NULL){
749
perror_plus("inet_ntop");
411
750
} else {
412
751
if(strcmp(addrstr, ip) != 0){
413
fprintf(stderr, "Canonical address form: %s\n", addrstr);
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 (mc, &session, &dh_params);
425
if (ret != 0){
426
retval = -1;
427
return -1;
428
}
429
430
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
752
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
753
}
754
}
755
}
756
757
if(quit_now){
758
errno = EINTR;
759
goto mandos_end;
760
}
761
762
if(af == AF_INET6){
763
ret = connect(tcp_sd, &to.in6, sizeof(to));
764
} else {
765
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
766
}
767
if(ret < 0){
768
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
769
int e = errno;
770
perror_plus("connect");
771
errno = e;
772
}
773
goto mandos_end;
774
}
775
776
if(quit_now){
777
errno = EINTR;
778
goto mandos_end;
779
}
780
781
const char *out = mandos_protocol_version;
782
written = 0;
783
while(true){
784
size_t out_size = strlen(out);
785
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
786
out_size - written));
787
if(ret == -1){
788
int e = errno;
789
perror_plus("write");
790
errno = e;
791
goto mandos_end;
792
}
793
written += (size_t)ret;
794
if(written < out_size){
795
continue;
796
} else {
797
if(out == mandos_protocol_version){
798
written = 0;
799
out = "\r\n";
800
} else {
801
break;
802
}
803
}
804
805
if(quit_now){
806
errno = EINTR;
807
goto mandos_end;
808
}
809
}
431
810
432
811
if(debug){
433
fprintf(stderr, "Establishing TLS session with %s\n", ip);
434
}
435
436
ret = gnutls_handshake (session);
437
438
if (ret != GNUTLS_E_SUCCESS){
812
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
813
}
814
815
if(quit_now){
816
errno = EINTR;
817
goto mandos_end;
818
}
819
820
/* Spurious warning from -Wint-to-pointer-cast */
821
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
822
823
if(quit_now){
824
errno = EINTR;
825
goto mandos_end;
826
}
827
828
do {
829
ret = gnutls_handshake(session);
830
if(quit_now){
831
errno = EINTR;
832
goto mandos_end;
833
}
834
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
835
836
if(ret != GNUTLS_E_SUCCESS){
439
837
if(debug){
440
fprintf(stderr, "\n*** Handshake failed ***\n");
441
gnutls_perror (ret);
838
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
839
gnutls_perror(ret);
442
840
}
443
retval = -1;
444
goto exit;
841
errno = EPROTO;
842
goto mandos_end;
445
843
}
446
844
447
//Retrieve OpenPGP packet that contains the wanted password
845
/* Read OpenPGP packet that contains the wanted password */
448
846
449
847
if(debug){
450
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
451
ip);
848
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
849
" %s\n", ip);
452
850
}
453
851
454
852
while(true){
455
if (buffer_length + BUFFER_SIZE > buffer_capacity){
456
buffer = realloc(buffer, buffer_capacity + BUFFER_SIZE);
457
if (buffer == NULL){
458
perror("realloc");
459
goto exit;
460
}
461
buffer_capacity += BUFFER_SIZE;
462
}
463
464
ret = gnutls_record_recv(session, buffer+buffer_length,
465
BUFFER_SIZE);
466
if (ret == 0){
853
854
if(quit_now){
855
errno = EINTR;
856
goto mandos_end;
857
}
858
859
buffer_capacity = incbuffer(&buffer, buffer_length,
860
buffer_capacity);
861
if(buffer_capacity == 0){
862
int e = errno;
863
perror_plus("incbuffer");
864
errno = e;
865
goto mandos_end;
866
}
867
868
if(quit_now){
869
errno = EINTR;
870
goto mandos_end;
871
}
872
873
sret = gnutls_record_recv(session, buffer+buffer_length,
874
BUFFER_SIZE);
875
if(sret == 0){
467
876
break;
468
877
}
469
if (ret < 0){
470
switch(ret){
878
if(sret < 0){
879
switch(sret){
471
880
case GNUTLS_E_INTERRUPTED:
472
881
case GNUTLS_E_AGAIN:
473
882
break;
474
883
case GNUTLS_E_REHANDSHAKE:
475
ret = gnutls_handshake (session);
476
if (ret < 0){
477
fprintf(stderr, "\n*** Handshake failed ***\n");
478
gnutls_perror (ret);
479
retval = -1;
480
goto exit;
884
do {
885
ret = gnutls_handshake(session);
886
887
if(quit_now){
888
errno = EINTR;
889
goto mandos_end;
890
}
891
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
892
if(ret < 0){
893
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
894
"***\n");
895
gnutls_perror(ret);
896
errno = EPROTO;
897
goto mandos_end;
481
898
}
482
899
break;
483
900
default:
484
fprintf(stderr, "Unknown error while reading data from"
485
" encrypted session with mandos server\n");
486
retval = -1;
487
gnutls_bye (session, GNUTLS_SHUT_RDWR);
488
goto exit;
901
fprintf_plus(stderr, "Unknown error while reading data from"
902
" encrypted session with Mandos server\n");
903
gnutls_bye(session, GNUTLS_SHUT_RDWR);
904
errno = EIO;
905
goto mandos_end;
489
906
}
490
907
} else {
491
buffer_length += (size_t) ret;
492
}
493
}
494
495
if (buffer_length > 0){
496
decrypted_buffer_size = pgp_packet_decrypt(buffer,
497
buffer_length,
498
&decrypted_buffer,
499
keydir);
500
if (decrypted_buffer_size >= 0){
908
buffer_length += (size_t) sret;
909
}
910
}
911
912
if(debug){
913
fprintf_plus(stderr, "Closing TLS session\n");
914
}
915
916
if(quit_now){
917
errno = EINTR;
918
goto mandos_end;
919
}
920
921
do {
922
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
923
if(quit_now){
924
errno = EINTR;
925
goto mandos_end;
926
}
927
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
928
929
if(buffer_length > 0){
930
ssize_t decrypted_buffer_size;
931
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
932
&decrypted_buffer);
933
if(decrypted_buffer_size >= 0){
934
935
written = 0;
501
936
while(written < (size_t) decrypted_buffer_size){
502
ret = (int)fwrite (decrypted_buffer + written, 1,
503
(size_t)decrypted_buffer_size - written,
504
stdout);
937
if(quit_now){
938
errno = EINTR;
939
goto mandos_end;
940
}
941
942
ret = (int)fwrite(decrypted_buffer + written, 1,
943
(size_t)decrypted_buffer_size - written,
944
stdout);
505
945
if(ret == 0 and ferror(stdout)){
946
int e = errno;
506
947
if(debug){
507
fprintf(stderr, "Error writing encrypted data: %s\n",
508
strerror(errno));
948
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
949
strerror(errno));
509
950
}
510
retval = -1;
511
break;
951
errno = e;
952
goto mandos_end;
512
953
}
513
954
written += (size_t)ret;
514
955
}
515
free(decrypted_buffer);
516
} else {
956
retval = 0;
957
}
958
}
959
960
/* Shutdown procedure */
961
962
mandos_end:
963
{
964
int e = errno;
965
free(decrypted_buffer);
966
free(buffer);
967
if(tcp_sd >= 0){
968
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
969
}
970
if(ret == -1){
971
if(e == 0){
972
e = errno;
973
}
974
perror_plus("close");
975
}
976
gnutls_deinit(session);
977
errno = e;
978
if(quit_now){
979
errno = EINTR;
517
980
retval = -1;
518
981
}
519
982
}
520
521
//shutdown procedure
522
523
if(debug){
524
fprintf(stderr, "Closing TLS session\n");
525
}
526
527
free(buffer);
528
gnutls_bye (session, GNUTLS_SHUT_RDWR);
529
exit:
530
close(tcp_sd);
531
gnutls_deinit (session);
532
gnutls_certificate_free_credentials (mc->cred);
533
gnutls_global_deinit ();
534
983
return retval;
535
984
}
536
985
537
static void resolve_callback( AvahiSServiceResolver *r,
538
AvahiIfIndex interface,
539
AVAHI_GCC_UNUSED AvahiProtocol protocol,
540
AvahiResolverEvent event,
541
const char *name,
542
const char *type,
543
const char *domain,
544
const char *host_name,
545
const AvahiAddress *address,
546
uint16_t port,
547
AVAHI_GCC_UNUSED AvahiStringList *txt,
548
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
549
void* userdata) {
550
mandos_context *mc = userdata;
551
assert(r); /* Spurious warning */
986
static void resolve_callback(AvahiSServiceResolver *r,
987
AvahiIfIndex interface,
988
AvahiProtocol proto,
989
AvahiResolverEvent event,
990
const char *name,
991
const char *type,
992
const char *domain,
993
const char *host_name,
994
const AvahiAddress *address,
995
uint16_t port,
996
AVAHI_GCC_UNUSED AvahiStringList *txt,
997
AVAHI_GCC_UNUSED AvahiLookupResultFlags
998
flags,
999
AVAHI_GCC_UNUSED void* userdata){
1000
assert(r);
552
1001
553
1002
/* Called whenever a service has been resolved successfully or
554
1003
timed out */
555
1004
556
switch (event) {
1005
if(quit_now){
1006
return;
1007
}
1008
1009
switch(event){
557
1010
default:
558
1011
case AVAHI_RESOLVER_FAILURE:
559
fprintf(stderr, "(Resolver) Failed to resolve service '%s' of"
560
" type '%s' in domain '%s': %s\n", name, type, domain,
561
avahi_strerror(avahi_server_errno(mc->server)));
1012
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1013
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1014
domain,
1015
avahi_strerror(avahi_server_errno(mc.server)));
562
1016
break;
563
1017
564
1018
case AVAHI_RESOLVER_FOUND:
566
1020
char ip[AVAHI_ADDRESS_STR_MAX];
567
1021
avahi_address_snprint(ip, sizeof(ip), address);
568
1022
if(debug){
569
fprintf(stderr, "Mandos server \"%s\" found on %s (%s) on"
570
" port %d\n", name, host_name, ip, port);
1023
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1024
PRIdMAX ") on port %" PRIu16 "\n", name,
1025
host_name, ip, (intmax_t)interface, port);
571
1026
}
572
int ret = start_mandos_communication(ip, port, interface, mc);
573
if (ret == 0){
574
exit(EXIT_SUCCESS);
1027
int ret = start_mandos_communication(ip, port, interface,
1028
avahi_proto_to_af(proto));
1029
if(ret == 0){
1030
avahi_simple_poll_quit(mc.simple_poll);
1031
} else {
1032
ret = add_server(ip, port, interface,
1033
avahi_proto_to_af(proto));
575
1034
}
576
1035
}
577
1036
}
578
1037
avahi_s_service_resolver_free(r);
579
1038
}
580
1039
581
static void browse_callback( AvahiSServiceBrowser *b,
582
AvahiIfIndex interface,
583
AvahiProtocol protocol,
584
AvahiBrowserEvent event,
585
const char *name,
586
const char *type,
587
const char *domain,
588
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
589
void* userdata) {
590
mandos_context *mc = userdata;
591
assert(b); /* Spurious warning */
1040
static void browse_callback(AvahiSServiceBrowser *b,
1041
AvahiIfIndex interface,
1042
AvahiProtocol protocol,
1043
AvahiBrowserEvent event,
1044
const char *name,
1045
const char *type,
1046
const char *domain,
1047
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1048
flags,
1049
AVAHI_GCC_UNUSED void* userdata){
1050
assert(b);
592
1051
593
1052
/* Called whenever a new services becomes available on the LAN or
594
1053
is removed from the LAN */
595
1054
596
switch (event) {
1055
if(quit_now){
1056
return;
1057
}
1058
1059
switch(event){
597
1060
default:
598
1061
case AVAHI_BROWSER_FAILURE:
599
1062
600
fprintf(stderr, "(Browser) %s\n",
601
avahi_strerror(avahi_server_errno(mc->server)));
602
avahi_simple_poll_quit(mc->simple_poll);
1063
fprintf_plus(stderr, "(Avahi browser) %s\n",
1064
avahi_strerror(avahi_server_errno(mc.server)));
1065
avahi_simple_poll_quit(mc.simple_poll);
603
1066
return;
604
1067
605
1068
case AVAHI_BROWSER_NEW:
606
/* We ignore the returned resolver object. In the callback
607
function we free it. If the server is terminated before
608
the callback function is called the server will free
609
the resolver for us. */
1069
/* We ignore the returned Avahi resolver object. In the callback
1070
function we free it. If the Avahi server is terminated before
1071
the callback function is called the Avahi server will free the
1072
resolver for us. */
610
1073
611
if (!(avahi_s_service_resolver_new(mc->server, interface, protocol, name,
612
type, domain,
613
AVAHI_PROTO_INET6, 0,
614
resolve_callback, mc)))
615
fprintf(stderr, "Failed to resolve service '%s': %s\n", name,
616
avahi_strerror(avahi_server_errno(mc->server)));
1074
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1075
name, type, domain, protocol, 0,
1076
resolve_callback, NULL) == NULL)
1077
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1078
" %s\n", name,
1079
avahi_strerror(avahi_server_errno(mc.server)));
617
1080
break;
618
1081
619
1082
case AVAHI_BROWSER_REMOVE:
621
1084
622
1085
case AVAHI_BROWSER_ALL_FOR_NOW:
623
1086
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1087
if(debug){
1088
fprintf_plus(stderr, "No Mandos server found, still"
1089
" searching...\n");
1090
}
624
1091
break;
625
1092
}
626
1093
}
627
1094
628
/* Combines file name and path and returns the malloced new
629
string. some sane checks could/should be added */
630
static const char *combinepath(const char *first, const char *second){
631
size_t f_len = strlen(first);
632
size_t s_len = strlen(second);
633
char *tmp = malloc(f_len + s_len + 2);
634
if (tmp == NULL){
635
return NULL;
636
}
637
if(f_len > 0){
638
memcpy(tmp, first, f_len); /* Spurious warning */
639
}
640
tmp[f_len] = '/';
641
if(s_len > 0){
642
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
643
}
644
tmp[f_len + 1 + s_len] = '\0';
645
return tmp;
646
}
647
648
649
int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
650
AvahiServerConfig config;
651
AvahiSServiceBrowser *sb = NULL;
652
int error;
653
int ret;
654
int debug_int;
655
int returncode = EXIT_SUCCESS;
656
const char *interface = "eth0";
657
struct ifreq network;
658
int sd;
659
char *connect_to = NULL;
660
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
661
mandos_context mc = { .simple_poll = NULL, .server = NULL,
662
.dh_bits = 1024, .priority = "SECURE256"};
1095
/* Signal handler that stops main loop after SIGTERM */
1096
static void handle_sigterm(int sig){
1097
if(quit_now){
1098
return;
1099
}
1100
quit_now = 1;
1101
signal_received = sig;
1102
int old_errno = errno;
1103
/* set main loop to exit */
1104
if(mc.simple_poll != NULL){
1105
avahi_simple_poll_quit(mc.simple_poll);
1106
}
1107
errno = old_errno;
1108
}
1109
1110
bool get_flags(const char *ifname, struct ifreq *ifr){
1111
int ret;
1112
1113
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1114
if(s < 0){
1115
perror_plus("socket");
1116
return false;
1117
}
1118
strcpy(ifr->ifr_name, ifname);
1119
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1120
if(ret == -1){
1121
if(debug){
1122
perror_plus("ioctl SIOCGIFFLAGS");
1123
}
1124
return false;
1125
}
1126
return true;
1127
}
1128
1129
bool good_flags(const char *ifname, const struct ifreq *ifr){
1130
1131
/* Reject the loopback device */
1132
if(ifr->ifr_flags & IFF_LOOPBACK){
1133
if(debug){
1134
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1135
ifname);
1136
}
1137
return false;
1138
}
1139
/* Accept point-to-point devices only if connect_to is specified */
1140
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1141
if(debug){
1142
fprintf_plus(stderr, "Accepting point-to-point interface"
1143
" \"%s\"\n", ifname);
1144
}
1145
return true;
1146
}
1147
/* Otherwise, reject non-broadcast-capable devices */
1148
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1149
if(debug){
1150
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1151
" \"%s\"\n", ifname);
1152
}
1153
return false;
1154
}
1155
/* Reject non-ARP interfaces (including dummy interfaces) */
1156
if(ifr->ifr_flags & IFF_NOARP){
1157
if(debug){
1158
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1159
ifname);
1160
}
1161
return false;
1162
}
1163
1164
/* Accept this device */
1165
if(debug){
1166
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1167
}
1168
return true;
1169
}
1170
1171
/*
1172
* This function determines if a directory entry in /sys/class/net
1173
* corresponds to an acceptable network device.
1174
* (This function is passed to scandir(3) as a filter function.)
1175
*/
1176
int good_interface(const struct dirent *if_entry){
1177
if(if_entry->d_name[0] == '.'){
1178
return 0;
1179
}
1180
1181
struct ifreq ifr;
1182
if(not get_flags(if_entry->d_name, &ifr)){
1183
if(debug){
1184
fprintf_plus(stderr, "Failed to get flags for interface "
1185
"\"%s\"\n", if_entry->d_name);
1186
}
1187
return 0;
1188
}
1189
1190
if(not good_flags(if_entry->d_name, &ifr)){
1191
return 0;
1192
}
1193
return 1;
1194
}
1195
1196
/*
1197
* This function determines if a directory entry in /sys/class/net
1198
* corresponds to an acceptable network device which is up.
1199
* (This function is passed to scandir(3) as a filter function.)
1200
*/
1201
int up_interface(const struct dirent *if_entry){
1202
if(if_entry->d_name[0] == '.'){
1203
return 0;
1204
}
1205
1206
struct ifreq ifr;
1207
if(not get_flags(if_entry->d_name, &ifr)){
1208
if(debug){
1209
fprintf_plus(stderr, "Failed to get flags for interface "
1210
"\"%s\"\n", if_entry->d_name);
1211
}
1212
return 0;
1213
}
1214
1215
/* Reject down interfaces */
1216
if(not (ifr.ifr_flags & IFF_UP)){
1217
if(debug){
1218
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1219
if_entry->d_name);
1220
}
1221
return 0;
1222
}
1223
1224
/* Reject non-running interfaces */
1225
if(not (ifr.ifr_flags & IFF_RUNNING)){
1226
if(debug){
1227
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1228
if_entry->d_name);
1229
}
1230
return 0;
1231
}
1232
1233
if(not good_flags(if_entry->d_name, &ifr)){
1234
return 0;
1235
}
1236
return 1;
1237
}
1238
1239
int notdotentries(const struct dirent *direntry){
1240
/* Skip "." and ".." */
1241
if(direntry->d_name[0] == '.'
1242
and (direntry->d_name[1] == '\0'
1243
or (direntry->d_name[1] == '.'
1244
and direntry->d_name[2] == '\0'))){
1245
return 0;
1246
}
1247
return 1;
1248
}
1249
1250
/* Is this directory entry a runnable program? */
1251
int runnable_hook(const struct dirent *direntry){
1252
int ret;
1253
size_t sret;
1254
struct stat st;
1255
1256
if((direntry->d_name)[0] == '\0'){
1257
/* Empty name? */
1258
return 0;
1259
}
1260
1261
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1262
"abcdefghijklmnopqrstuvwxyz"
1263
"0123456789"
1264
"_-");
1265
if((direntry->d_name)[sret] != '\0'){
1266
/* Contains non-allowed characters */
1267
if(debug){
1268
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1269
direntry->d_name);
1270
}
1271
return 0;
1272
}
1273
1274
char *fullname = NULL;
1275
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1276
if(ret < 0){
1277
perror_plus("asprintf");
1278
return 0;
1279
}
1280
1281
ret = stat(fullname, &st);
1282
if(ret == -1){
1283
if(debug){
1284
perror_plus("Could not stat hook");
1285
}
1286
return 0;
1287
}
1288
if(not (S_ISREG(st.st_mode))){
1289
/* Not a regular file */
1290
if(debug){
1291
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1292
direntry->d_name);
1293
}
1294
return 0;
1295
}
1296
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1297
/* Not executable */
1298
if(debug){
1299
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1300
direntry->d_name);
1301
}
1302
return 0;
1303
}
1304
if(debug){
1305
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1306
direntry->d_name);
1307
}
1308
return 1;
1309
}
1310
1311
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1312
int ret;
1313
struct timespec now;
1314
struct timespec waited_time;
1315
intmax_t block_time;
1316
1317
while(true){
1318
if(mc.current_server == NULL){
1319
if (debug){
1320
fprintf_plus(stderr, "Wait until first server is found."
1321
" No timeout!\n");
1322
}
1323
ret = avahi_simple_poll_iterate(s, -1);
1324
} else {
1325
if (debug){
1326
fprintf_plus(stderr, "Check current_server if we should run"
1327
" it, or wait\n");
1328
}
1329
/* the current time */
1330
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1331
if(ret == -1){
1332
perror_plus("clock_gettime");
1333
return -1;
1334
}
1335
/* Calculating in ms how long time between now and server
1336
who we visted longest time ago. Now - last seen. */
1337
waited_time.tv_sec = (now.tv_sec
1338
- mc.current_server->last_seen.tv_sec);
1339
waited_time.tv_nsec = (now.tv_nsec
1340
- mc.current_server->last_seen.tv_nsec);
1341
/* total time is 10s/10,000ms.
1342
Converting to s from ms by dividing by 1,000,
1343
and ns to ms by dividing by 1,000,000. */
1344
block_time = ((retry_interval
1345
- ((intmax_t)waited_time.tv_sec * 1000))
1346
- ((intmax_t)waited_time.tv_nsec / 1000000));
1347
1348
if (debug){
1349
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1350
block_time);
1351
}
1352
1353
if(block_time <= 0){
1354
ret = start_mandos_communication(mc.current_server->ip,
1355
mc.current_server->port,
1356
mc.current_server->if_index,
1357
mc.current_server->af);
1358
if(ret == 0){
1359
avahi_simple_poll_quit(mc.simple_poll);
1360
return 0;
1361
}
1362
ret = clock_gettime(CLOCK_MONOTONIC,
1363
&mc.current_server->last_seen);
1364
if(ret == -1){
1365
perror_plus("clock_gettime");
1366
return -1;
1367
}
1368
mc.current_server = mc.current_server->next;
1369
block_time = 0; /* Call avahi to find new Mandos
1370
servers, but don't block */
1371
}
1372
1373
ret = avahi_simple_poll_iterate(s, (int)block_time);
1374
}
1375
if(ret != 0){
1376
if (ret > 0 or errno != EINTR){
1377
return (ret != 1) ? ret : 0;
1378
}
1379
}
1380
}
1381
}
1382
1383
bool run_network_hooks(const char *mode, const char *interface,
1384
const float delay){
1385
struct dirent **direntries;
1386
struct dirent *direntry;
1387
int ret;
1388
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1389
alphasort);
1390
if(numhooks == -1){
1391
perror_plus("scandir");
1392
} else {
1393
int devnull = open("/dev/null", O_RDONLY);
1394
for(int i = 0; i < numhooks; i++){
1395
direntry = direntries[i];
1396
char *fullname = NULL;
1397
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1398
if(ret < 0){
1399
perror_plus("asprintf");
1400
continue;
1401
}
1402
if(debug){
1403
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1404
direntry->d_name);
1405
}
1406
pid_t hook_pid = fork();
1407
if(hook_pid == 0){
1408
/* Child */
1409
dup2(devnull, STDIN_FILENO);
1410
close(devnull);
1411
dup2(STDERR_FILENO, STDOUT_FILENO);
1412
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1413
if(ret == -1){
1414
perror_plus("setenv");
1415
return false;
1416
}
1417
ret = setenv("DEVICE", interface, 1);
1418
if(ret == -1){
1419
perror_plus("setenv");
1420
return false;
1421
}
1422
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1423
if(ret == -1){
1424
perror_plus("setenv");
1425
return false;
1426
}
1427
ret = setenv("MODE", mode, 1);
1428
if(ret == -1){
1429
perror_plus("setenv");
1430
return false;
1431
}
1432
char *delaystring;
1433
ret = asprintf(&delaystring, "%f", delay);
1434
if(ret == -1){
1435
perror_plus("asprintf");
1436
return false;
1437
}
1438
ret = setenv("DELAY", delaystring, 1);
1439
if(ret == -1){
1440
free(delaystring);
1441
perror_plus("setenv");
1442
return false;
1443
}
1444
free(delaystring);
1445
ret = execl(fullname, direntry->d_name, mode, NULL);
1446
perror_plus("execl");
1447
} else {
1448
int status;
1449
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1450
perror_plus("waitpid");
1451
free(fullname);
1452
continue;
1453
}
1454
if(WIFEXITED(status)){
1455
if(WEXITSTATUS(status) != 0){
1456
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1457
" with status %d\n", direntry->d_name,
1458
WEXITSTATUS(status));
1459
free(fullname);
1460
continue;
1461
}
1462
} else if(WIFSIGNALED(status)){
1463
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1464
" signal %d\n", direntry->d_name,
1465
WTERMSIG(status));
1466
free(fullname);
1467
continue;
1468
} else {
1469
fprintf_plus(stderr, "Warning: network hook \"%s\""
1470
" crashed\n", direntry->d_name);
1471
free(fullname);
1472
continue;
1473
}
1474
}
1475
free(fullname);
1476
if(debug){
1477
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1478
direntry->d_name);
1479
}
1480
}
1481
close(devnull);
1482
}
1483
return true;
1484
}
1485
1486
int main(int argc, char *argv[]){
1487
AvahiSServiceBrowser *sb = NULL;
1488
int error;
1489
int ret;
1490
intmax_t tmpmax;
1491
char *tmp;
1492
int exitcode = EXIT_SUCCESS;
1493
const char *interface = "";
1494
struct ifreq network;
1495
int sd = -1;
1496
bool take_down_interface = false;
1497
uid_t uid;
1498
gid_t gid;
1499
char tempdir[] = "/tmp/mandosXXXXXX";
1500
bool tempdir_created = false;
1501
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1502
const char *seckey = PATHDIR "/" SECKEY;
1503
const char *pubkey = PATHDIR "/" PUBKEY;
1504
1505
bool gnutls_initialized = false;
1506
bool gpgme_initialized = false;
1507
float delay = 2.5f;
1508
double retry_interval = 10; /* 10s between trying a server and
1509
retrying the same server again */
1510
1511
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1512
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1513
1514
uid = getuid();
1515
gid = getgid();
1516
1517
/* Lower any group privileges we might have, just to be safe */
1518
errno = 0;
1519
ret = setgid(gid);
1520
if(ret == -1){
1521
perror_plus("setgid");
1522
}
1523
1524
/* Lower user privileges (temporarily) */
1525
errno = 0;
1526
ret = seteuid(uid);
1527
if(ret == -1){
1528
perror_plus("seteuid");
1529
}
1530
1531
if(quit_now){
1532
goto end;
1533
}
1534
1535
{
1536
struct argp_option options[] = {
1537
{ .name = "debug", .key = 128,
1538
.doc = "Debug mode", .group = 3 },
1539
{ .name = "connect", .key = 'c',
1540
.arg = "ADDRESS:PORT",
1541
.doc = "Connect directly to a specific Mandos server",
1542
.group = 1 },
1543
{ .name = "interface", .key = 'i',
1544
.arg = "NAME",
1545
.doc = "Network interface that will be used to search for"
1546
" Mandos servers",
1547
.group = 1 },
1548
{ .name = "seckey", .key = 's',
1549
.arg = "FILE",
1550
.doc = "OpenPGP secret key file base name",
1551
.group = 1 },
1552
{ .name = "pubkey", .key = 'p',
1553
.arg = "FILE",
1554
.doc = "OpenPGP public key file base name",
1555
.group = 2 },
1556
{ .name = "dh-bits", .key = 129,
1557
.arg = "BITS",
1558
.doc = "Bit length of the prime number used in the"
1559
" Diffie-Hellman key exchange",
1560
.group = 2 },
1561
{ .name = "priority", .key = 130,
1562
.arg = "STRING",
1563
.doc = "GnuTLS priority string for the TLS handshake",
1564
.group = 1 },
1565
{ .name = "delay", .key = 131,
1566
.arg = "SECONDS",
1567
.doc = "Maximum delay to wait for interface startup",
1568
.group = 2 },
1569
{ .name = "retry", .key = 132,
1570
.arg = "SECONDS",
1571
.doc = "Retry interval used when denied by the mandos server",
1572
.group = 2 },
1573
{ .name = "network-hook-dir", .key = 133,
1574
.arg = "DIR",
1575
.doc = "Directory where network hooks are located",
1576
.group = 2 },
1577
/*
1578
* These reproduce what we would get without ARGP_NO_HELP
1579
*/
1580
{ .name = "help", .key = '?',
1581
.doc = "Give this help list", .group = -1 },
1582
{ .name = "usage", .key = -3,
1583
.doc = "Give a short usage message", .group = -1 },
1584
{ .name = "version", .key = 'V',
1585
.doc = "Print program version", .group = -1 },
1586
{ .name = NULL }
1587
};
663
1588
664
debug_int = debug ? 1 : 0;
665
while (true){
666
struct option long_options[] = {
667
{"debug", no_argument, &debug_int, 1},
668
{"connect", required_argument, NULL, 'c'},
669
{"interface", required_argument, NULL, 'i'},
670
{"keydir", required_argument, NULL, 'd'},
671
{"seckey", required_argument, NULL, 's'},
672
{"pubkey", required_argument, NULL, 'p'},
673
{"dh-bits", required_argument, NULL, 'D'},
674
{"priority", required_argument, NULL, 'P'},
675
{0, 0, 0, 0} };
676
677
int option_index = 0;
678
ret = getopt_long (argc, argv, "i:", long_options,
679
&option_index);
680
681
if (ret == -1){
682
break;
683
}
684
685
switch(ret){
686
case 0:
687
break;
688
case 'i':
689
interface = optarg;
690
break;
691
case 'c':
692
connect_to = optarg;
693
break;
694
case 'd':
695
keydir = optarg;
696
break;
697
case 'p':
698
pubkeyfile = optarg;
699
break;
700
case 's':
701
seckeyfile = optarg;
702
break;
703
case 'D':
704
errno = 0;
705
mc.dh_bits = (unsigned int) strtol(optarg, NULL, 10);
706
if (errno){
707
perror("strtol");
708
exit(EXIT_FAILURE);
709
}
710
break;
711
case 'P':
712
mc.priority = optarg;
713
break;
714
case '?':
1589
error_t parse_opt(int key, char *arg,
1590
struct argp_state *state){
1591
errno = 0;
1592
switch(key){
1593
case 128: /* --debug */
1594
debug = true;
1595
break;
1596
case 'c': /* --connect */
1597
connect_to = arg;
1598
break;
1599
case 'i': /* --interface */
1600
interface = arg;
1601
break;
1602
case 's': /* --seckey */
1603
seckey = arg;
1604
break;
1605
case 'p': /* --pubkey */
1606
pubkey = arg;
1607
break;
1608
case 129: /* --dh-bits */
1609
errno = 0;
1610
tmpmax = strtoimax(arg, &tmp, 10);
1611
if(errno != 0 or tmp == arg or *tmp != '\0'
1612
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1613
argp_error(state, "Bad number of DH bits");
1614
}
1615
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1616
break;
1617
case 130: /* --priority */
1618
mc.priority = arg;
1619
break;
1620
case 131: /* --delay */
1621
errno = 0;
1622
delay = strtof(arg, &tmp);
1623
if(errno != 0 or tmp == arg or *tmp != '\0'){
1624
argp_error(state, "Bad delay");
1625
}
1626
case 132: /* --retry */
1627
errno = 0;
1628
retry_interval = strtod(arg, &tmp);
1629
if(errno != 0 or tmp == arg or *tmp != '\0'
1630
or (retry_interval * 1000) > INT_MAX
1631
or retry_interval < 0){
1632
argp_error(state, "Bad retry interval");
1633
}
1634
break;
1635
case 133: /* --network-hook-dir */
1636
hookdir = arg;
1637
break;
1638
/*
1639
* These reproduce what we would get without ARGP_NO_HELP
1640
*/
1641
case '?': /* --help */
1642
argp_state_help(state, state->out_stream,
1643
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1644
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1645
case -3: /* --usage */
1646
argp_state_help(state, state->out_stream,
1647
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1648
case 'V': /* --version */
1649
fprintf_plus(state->out_stream,
1650
"Mandos plugin mandos-client: ");
1651
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1652
exit(argp_err_exit_status);
1653
break;
715
1654
default:
716
exit(EXIT_FAILURE);
717
}
718
}
719
debug = debug_int ? true : false;
720
721
pubkeyfile = combinepath(keydir, pubkeyfile);
722
if (pubkeyfile == NULL){
723
perror("combinepath");
724
returncode = EXIT_FAILURE;
725
goto exit;
726
}
727
728
seckeyfile = combinepath(keydir, seckeyfile);
729
if (seckeyfile == NULL){
730
perror("combinepath");
731
goto exit;
732
}
733
1655
return ARGP_ERR_UNKNOWN;
1656
}
1657
return errno;
1658
}
1659
1660
struct argp argp = { .options = options, .parser = parse_opt,
1661
.args_doc = "",
1662
.doc = "Mandos client -- Get and decrypt"
1663
" passwords from a Mandos server" };
1664
ret = argp_parse(&argp, argc, argv,
1665
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1666
switch(ret){
1667
case 0:
1668
break;
1669
case ENOMEM:
1670
default:
1671
errno = ret;
1672
perror_plus("argp_parse");
1673
exitcode = EX_OSERR;
1674
goto end;
1675
case EINVAL:
1676
exitcode = EX_USAGE;
1677
goto end;
1678
}
1679
}
1680
1681
if(getuid() == 0){
1682
/* Work around Debian bug #633582:
1683
<http://bugs.debian.org/633582> */
1684
struct stat st;
1685
1686
/* Re-raise priviliges */
1687
errno = 0;
1688
ret = seteuid(0);
1689
if(ret == -1){
1690
perror_plus("seteuid");
1691
}
1692
1693
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1694
int seckey_fd = open(seckey, O_RDONLY);
1695
if(seckey_fd == -1){
1696
perror_plus("open");
1697
} else {
1698
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1699
if(ret == -1){
1700
perror_plus("fstat");
1701
} else {
1702
if(S_ISREG(st.st_mode)
1703
and st.st_uid == 0 and st.st_gid == 0){
1704
ret = fchown(seckey_fd, uid, gid);
1705
if(ret == -1){
1706
perror_plus("fchown");
1707
}
1708
}
1709
}
1710
TEMP_FAILURE_RETRY(close(seckey_fd));
1711
}
1712
}
1713
1714
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1715
int pubkey_fd = open(pubkey, O_RDONLY);
1716
if(pubkey_fd == -1){
1717
perror_plus("open");
1718
} else {
1719
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1720
if(ret == -1){
1721
perror_plus("fstat");
1722
} else {
1723
if(S_ISREG(st.st_mode)
1724
and st.st_uid == 0 and st.st_gid == 0){
1725
ret = fchown(pubkey_fd, uid, gid);
1726
if(ret == -1){
1727
perror_plus("fchown");
1728
}
1729
}
1730
}
1731
TEMP_FAILURE_RETRY(close(pubkey_fd));
1732
}
1733
}
1734
1735
/* Lower privileges */
1736
errno = 0;
1737
ret = seteuid(uid);
1738
if(ret == -1){
1739
perror_plus("seteuid");
1740
}
1741
}
1742
1743
/* Run network hooks */
1744
{
1745
if(getuid() == 0){
1746
/* Re-raise priviliges */
1747
errno = 0;
1748
ret = seteuid(0);
1749
if(ret == -1){
1750
perror_plus("seteuid");
1751
}
1752
}
1753
if(not run_network_hooks("start", interface, delay)){
1754
goto end;
1755
}
1756
if(getuid() == 0){
1757
/* Lower privileges */
1758
errno = 0;
1759
ret = seteuid(uid);
1760
if(ret == -1){
1761
perror_plus("seteuid");
1762
}
1763
}
1764
}
1765
1766
if(not debug){
1767
avahi_set_log_function(empty_log);
1768
}
1769
1770
if(interface[0] == '\0'){
1771
struct dirent **direntries;
1772
/* First look for interfaces that are up */
1773
ret = scandir(sys_class_net, &direntries, up_interface,
1774
alphasort);
1775
if(ret == 0){
1776
/* No up interfaces, look for any good interfaces */
1777
free(direntries);
1778
ret = scandir(sys_class_net, &direntries, good_interface,
1779
alphasort);
1780
}
1781
if(ret >= 1){
1782
/* Pick the first interface returned */
1783
interface = strdup(direntries[0]->d_name);
1784
if(debug){
1785
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1786
}
1787
if(interface == NULL){
1788
perror_plus("malloc");
1789
free(direntries);
1790
exitcode = EXIT_FAILURE;
1791
goto end;
1792
}
1793
free(direntries);
1794
} else {
1795
free(direntries);
1796
fprintf_plus(stderr, "Could not find a network interface\n");
1797
exitcode = EXIT_FAILURE;
1798
goto end;
1799
}
1800
}
1801
1802
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1803
from the signal handler */
1804
/* Initialize the pseudo-RNG for Avahi */
1805
srand((unsigned int) time(NULL));
1806
mc.simple_poll = avahi_simple_poll_new();
1807
if(mc.simple_poll == NULL){
1808
fprintf_plus(stderr,
1809
"Avahi: Failed to create simple poll object.\n");
1810
exitcode = EX_UNAVAILABLE;
1811
goto end;
1812
}
1813
1814
sigemptyset(&sigterm_action.sa_mask);
1815
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1816
if(ret == -1){
1817
perror_plus("sigaddset");
1818
exitcode = EX_OSERR;
1819
goto end;
1820
}
1821
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1822
if(ret == -1){
1823
perror_plus("sigaddset");
1824
exitcode = EX_OSERR;
1825
goto end;
1826
}
1827
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1828
if(ret == -1){
1829
perror_plus("sigaddset");
1830
exitcode = EX_OSERR;
1831
goto end;
1832
}
1833
/* Need to check if the handler is SIG_IGN before handling:
1834
| [[info:libc:Initial Signal Actions]] |
1835
| [[info:libc:Basic Signal Handling]] |
1836
*/
1837
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1838
if(ret == -1){
1839
perror_plus("sigaction");
1840
return EX_OSERR;
1841
}
1842
if(old_sigterm_action.sa_handler != SIG_IGN){
1843
ret = sigaction(SIGINT, &sigterm_action, NULL);
1844
if(ret == -1){
1845
perror_plus("sigaction");
1846
exitcode = EX_OSERR;
1847
goto end;
1848
}
1849
}
1850
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1851
if(ret == -1){
1852
perror_plus("sigaction");
1853
return EX_OSERR;
1854
}
1855
if(old_sigterm_action.sa_handler != SIG_IGN){
1856
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1857
if(ret == -1){
1858
perror_plus("sigaction");
1859
exitcode = EX_OSERR;
1860
goto end;
1861
}
1862
}
1863
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1864
if(ret == -1){
1865
perror_plus("sigaction");
1866
return EX_OSERR;
1867
}
1868
if(old_sigterm_action.sa_handler != SIG_IGN){
1869
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1870
if(ret == -1){
1871
perror_plus("sigaction");
1872
exitcode = EX_OSERR;
1873
goto end;
1874
}
1875
}
1876
1877
/* If the interface is down, bring it up */
1878
if(strcmp(interface, "none") != 0){
734
1879
if_index = (AvahiIfIndex) if_nametoindex(interface);
735
1880
if(if_index == 0){
736
fprintf(stderr, "No such interface: \"%s\"\n", interface);
737
exit(EXIT_FAILURE);
738
}
739
740
if(connect_to != NULL){
741
/* Connect directly, do not use Zeroconf */
742
/* (Mainly meant for debugging) */
743
char *address = strrchr(connect_to, ':');
744
if(address == NULL){
745
fprintf(stderr, "No colon in address\n");
746
exit(EXIT_FAILURE);
747
}
748
errno = 0;
749
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
750
if(errno){
751
perror("Bad port number");
752
exit(EXIT_FAILURE);
753
}
754
*address = '\0';
755
address = connect_to;
756
ret = start_mandos_communication(address, port, if_index, &mc);
757
if(ret < 0){
758
exit(EXIT_FAILURE);
759
} else {
760
exit(EXIT_SUCCESS);
761
}
762
}
1881
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1882
exitcode = EX_UNAVAILABLE;
1883
goto end;
1884
}
1885
1886
if(quit_now){
1887
goto end;
1888
}
1889
1890
/* Re-raise priviliges */
1891
errno = 0;
1892
ret = seteuid(0);
1893
if(ret == -1){
1894
perror_plus("seteuid");
1895
}
1896
1897
#ifdef __linux__
1898
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1899
messages about the network interface to mess up the prompt */
1900
ret = klogctl(8, NULL, 5);
1901
bool restore_loglevel = true;
1902
if(ret == -1){
1903
restore_loglevel = false;
1904
perror_plus("klogctl");
1905
}
1906
#endif /* __linux__ */
763
1907
764
1908
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
765
if(sd < 0) {
766
perror("socket");
767
returncode = EXIT_FAILURE;
768
goto exit;
1909
if(sd < 0){
1910
perror_plus("socket");
1911
exitcode = EX_OSERR;
1912
#ifdef __linux__
1913
if(restore_loglevel){
1914
ret = klogctl(7, NULL, 0);
1915
if(ret == -1){
1916
perror_plus("klogctl");
1917
}
1918
}
1919
#endif /* __linux__ */
1920
/* Lower privileges */
1921
errno = 0;
1922
ret = seteuid(uid);
1923
if(ret == -1){
1924
perror_plus("seteuid");
1925
}
1926
goto end;
769
1927
}
770
strcpy(network.ifr_name, interface); /* Spurious warning */
1928
strcpy(network.ifr_name, interface);
771
1929
ret = ioctl(sd, SIOCGIFFLAGS, &network);
772
1930
if(ret == -1){
773
774
perror("ioctl SIOCGIFFLAGS");
775
returncode = EXIT_FAILURE;
776
goto exit;
1931
perror_plus("ioctl SIOCGIFFLAGS");
1932
#ifdef __linux__
1933
if(restore_loglevel){
1934
ret = klogctl(7, NULL, 0);
1935
if(ret == -1){
1936
perror_plus("klogctl");
1937
}
1938
}
1939
#endif /* __linux__ */
1940
exitcode = EX_OSERR;
1941
/* Lower privileges */
1942
errno = 0;
1943
ret = seteuid(uid);
1944
if(ret == -1){
1945
perror_plus("seteuid");
1946
}
1947
goto end;
777
1948
}
778
1949
if((network.ifr_flags & IFF_UP) == 0){
779
1950
network.ifr_flags |= IFF_UP;
1951
take_down_interface = true;
780
1952
ret = ioctl(sd, SIOCSIFFLAGS, &network);
781
1953
if(ret == -1){
782
perror("ioctl SIOCSIFFLAGS");
783
returncode = EXIT_FAILURE;
784
goto exit;
785
}
786
}
787
close(sd);
788
789
if (not debug){
790
avahi_set_log_function(empty_log);
791
}
792
793
/* Initialize the psuedo-RNG */
794
srand((unsigned int) time(NULL));
795
796
/* Allocate main loop object */
797
if (!(mc.simple_poll = avahi_simple_poll_new())) {
798
fprintf(stderr, "Failed to create simple poll object.\n");
799
returncode = EXIT_FAILURE;
800
goto exit;
801
}
802
803
/* Do not publish any local records */
1954
take_down_interface = false;
1955
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1956
exitcode = EX_OSERR;
1957
#ifdef __linux__
1958
if(restore_loglevel){
1959
ret = klogctl(7, NULL, 0);
1960
if(ret == -1){
1961
perror_plus("klogctl");
1962
}
1963
}
1964
#endif /* __linux__ */
1965
/* Lower privileges */
1966
errno = 0;
1967
ret = seteuid(uid);
1968
if(ret == -1){
1969
perror_plus("seteuid");
1970
}
1971
goto end;
1972
}
1973
}
1974
/* Sleep checking until interface is running.
1975
Check every 0.25s, up to total time of delay */
1976
for(int i=0; i < delay * 4; i++){
1977
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1978
if(ret == -1){
1979
perror_plus("ioctl SIOCGIFFLAGS");
1980
} else if(network.ifr_flags & IFF_RUNNING){
1981
break;
1982
}
1983
struct timespec sleeptime = { .tv_nsec = 250000000 };
1984
ret = nanosleep(&sleeptime, NULL);
1985
if(ret == -1 and errno != EINTR){
1986
perror_plus("nanosleep");
1987
}
1988
}
1989
if(not take_down_interface){
1990
/* We won't need the socket anymore */
1991
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1992
if(ret == -1){
1993
perror_plus("close");
1994
}
1995
}
1996
#ifdef __linux__
1997
if(restore_loglevel){
1998
/* Restores kernel loglevel to default */
1999
ret = klogctl(7, NULL, 0);
2000
if(ret == -1){
2001
perror_plus("klogctl");
2002
}
2003
}
2004
#endif /* __linux__ */
2005
/* Lower privileges */
2006
errno = 0;
2007
/* Lower privileges */
2008
ret = seteuid(uid);
2009
if(ret == -1){
2010
perror_plus("seteuid");
2011
}
2012
}
2013
2014
if(quit_now){
2015
goto end;
2016
}
2017
2018
ret = init_gnutls_global(pubkey, seckey);
2019
if(ret == -1){
2020
fprintf_plus(stderr, "init_gnutls_global failed\n");
2021
exitcode = EX_UNAVAILABLE;
2022
goto end;
2023
} else {
2024
gnutls_initialized = true;
2025
}
2026
2027
if(quit_now){
2028
goto end;
2029
}
2030
2031
if(mkdtemp(tempdir) == NULL){
2032
perror_plus("mkdtemp");
2033
goto end;
2034
}
2035
tempdir_created = true;
2036
2037
if(quit_now){
2038
goto end;
2039
}
2040
2041
if(not init_gpgme(pubkey, seckey, tempdir)){
2042
fprintf_plus(stderr, "init_gpgme failed\n");
2043
exitcode = EX_UNAVAILABLE;
2044
goto end;
2045
} else {
2046
gpgme_initialized = true;
2047
}
2048
2049
if(quit_now){
2050
goto end;
2051
}
2052
2053
if(connect_to != NULL){
2054
/* Connect directly, do not use Zeroconf */
2055
/* (Mainly meant for debugging) */
2056
char *address = strrchr(connect_to, ':');
2057
if(address == NULL){
2058
fprintf_plus(stderr, "No colon in address\n");
2059
exitcode = EX_USAGE;
2060
goto end;
2061
}
2062
2063
if(quit_now){
2064
goto end;
2065
}
2066
2067
uint16_t port;
2068
errno = 0;
2069
tmpmax = strtoimax(address+1, &tmp, 10);
2070
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2071
or tmpmax != (uint16_t)tmpmax){
2072
fprintf_plus(stderr, "Bad port number\n");
2073
exitcode = EX_USAGE;
2074
goto end;
2075
}
2076
2077
if(quit_now){
2078
goto end;
2079
}
2080
2081
port = (uint16_t)tmpmax;
2082
*address = '\0';
2083
/* Colon in address indicates IPv6 */
2084
int af;
2085
if(strchr(connect_to, ':') != NULL){
2086
af = AF_INET6;
2087
/* Accept [] around IPv6 address - see RFC 5952 */
2088
if(connect_to[0] == '[' and address[-1] == ']')
2089
{
2090
connect_to++;
2091
address[-1] = '\0';
2092
}
2093
} else {
2094
af = AF_INET;
2095
}
2096
address = connect_to;
2097
2098
if(quit_now){
2099
goto end;
2100
}
2101
2102
while(not quit_now){
2103
ret = start_mandos_communication(address, port, if_index, af);
2104
if(quit_now or ret == 0){
2105
break;
2106
}
2107
if(debug){
2108
fprintf_plus(stderr, "Retrying in %d seconds\n",
2109
(int)retry_interval);
2110
}
2111
sleep((int)retry_interval);
2112
}
2113
2114
if (not quit_now){
2115
exitcode = EXIT_SUCCESS;
2116
}
2117
2118
goto end;
2119
}
2120
2121
if(quit_now){
2122
goto end;
2123
}
2124
2125
{
2126
AvahiServerConfig config;
2127
/* Do not publish any local Zeroconf records */
804
2128
avahi_server_config_init(&config);
805
2129
config.publish_hinfo = 0;
806
2130
config.publish_addresses = 0;
807
2131
config.publish_workstation = 0;
808
2132
config.publish_domain = 0;
809
2133
810
2134
/* Allocate a new server */
811
mc.server=avahi_server_new(avahi_simple_poll_get(mc.simple_poll),
812
&config, NULL, NULL, &error);
2135
mc.server = avahi_server_new(avahi_simple_poll_get
2136
(mc.simple_poll), &config, NULL,
2137
NULL, &error);
813
2138
814
/* Free the configuration data */
2139
/* Free the Avahi configuration data */
815
2140
avahi_server_config_free(&config);
816
817
/* Check if creating the server object succeeded */
818
if (!mc.server) {
819
fprintf(stderr, "Failed to create server: %s\n",
820
avahi_strerror(error));
821
returncode = EXIT_FAILURE;
822
goto exit;
823
}
824
825
/* Create the service browser */
826
sb = avahi_s_service_browser_new(mc.server, if_index,
827
AVAHI_PROTO_INET6,
828
"_mandos._tcp", NULL, 0,
829
browse_callback, &mc);
830
if (!sb) {
831
fprintf(stderr, "Failed to create service browser: %s\n",
832
avahi_strerror(avahi_server_errno(mc.server)));
833
returncode = EXIT_FAILURE;
834
goto exit;
835
}
836
837
/* Run the main loop */
838
839
if (debug){
840
fprintf(stderr, "Starting avahi loop search\n");
841
}
842
843
avahi_simple_poll_loop(mc.simple_poll);
844
845
exit:
846
847
if (debug){
848
fprintf(stderr, "%s exiting\n", argv[0]);
849
}
850
851
/* Cleanup things */
852
if (sb)
853
avahi_s_service_browser_free(sb);
854
855
if (mc.server)
856
avahi_server_free(mc.server);
857
858
if (mc.simple_poll)
859
avahi_simple_poll_free(mc.simple_poll);
860
free(pubkeyfile);
861
free(seckeyfile);
862
863
return returncode;
2141
}
2142
2143
/* Check if creating the Avahi server object succeeded */
2144
if(mc.server == NULL){
2145
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2146
avahi_strerror(error));
2147
exitcode = EX_UNAVAILABLE;
2148
goto end;
2149
}
2150
2151
if(quit_now){
2152
goto end;
2153
}
2154
2155
/* Create the Avahi service browser */
2156
sb = avahi_s_service_browser_new(mc.server, if_index,
2157
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2158
NULL, 0, browse_callback, NULL);
2159
if(sb == NULL){
2160
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2161
avahi_strerror(avahi_server_errno(mc.server)));
2162
exitcode = EX_UNAVAILABLE;
2163
goto end;
2164
}
2165
2166
if(quit_now){
2167
goto end;
2168
}
2169
2170
/* Run the main loop */
2171
2172
if(debug){
2173
fprintf_plus(stderr, "Starting Avahi loop search\n");
2174
}
2175
2176
ret = avahi_loop_with_timeout(mc.simple_poll,
2177
(int)(retry_interval * 1000));
2178
if(debug){
2179
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2180
(ret == 0) ? "successfully" : "with error");
2181
}
2182
2183
end:
2184
2185
if(debug){
2186
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2187
}
2188
2189
/* Cleanup things */
2190
if(sb != NULL)
2191
avahi_s_service_browser_free(sb);
2192
2193
if(mc.server != NULL)
2194
avahi_server_free(mc.server);
2195
2196
if(mc.simple_poll != NULL)
2197
avahi_simple_poll_free(mc.simple_poll);
2198
2199
if(gnutls_initialized){
2200
gnutls_certificate_free_credentials(mc.cred);
2201
gnutls_global_deinit();
2202
gnutls_dh_params_deinit(mc.dh_params);
2203
}
2204
2205
if(gpgme_initialized){
2206
gpgme_release(mc.ctx);
2207
}
2208
2209
/* Cleans up the circular linked list of Mandos servers the client
2210
has seen */
2211
if(mc.current_server != NULL){
2212
mc.current_server->prev->next = NULL;
2213
while(mc.current_server != NULL){
2214
server *next = mc.current_server->next;
2215
free(mc.current_server);
2216
mc.current_server = next;
2217
}
2218
}
2219
2220
/* Re-raise priviliges */
2221
{
2222
if(getuid() == 0){
2223
errno = 0;
2224
ret = seteuid(0);
2225
if(ret == -1){
2226
perror_plus("seteuid");
2227
}
2228
}
2229
2230
/* Run network hooks */
2231
run_network_hooks("stop", interface, delay);
2232
2233
/* Take down the network interface */
2234
if(take_down_interface and geteuid() == 0){
2235
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2236
if(ret == -1){
2237
perror_plus("ioctl SIOCGIFFLAGS");
2238
} else if(network.ifr_flags & IFF_UP){
2239
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2240
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2241
if(ret == -1){
2242
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2243
}
2244
}
2245
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2246
if(ret == -1){
2247
perror_plus("close");
2248
}
2249
}
2250
}
2251
if(getuid() == 0){
2252
/* Lower privileges permanently */
2253
errno = 0;
2254
ret = setuid(uid);
2255
if(ret == -1){
2256
perror_plus("setuid");
2257
}
2258
}
2259
2260
/* Removes the GPGME temp directory and all files inside */
2261
if(tempdir_created){
2262
struct dirent **direntries = NULL;
2263
struct dirent *direntry = NULL;
2264
int numentries = scandir(tempdir, &direntries, notdotentries,
2265
alphasort);
2266
if (numentries > 0){
2267
for(int i = 0; i < numentries; i++){
2268
direntry = direntries[i];
2269
char *fullname = NULL;
2270
ret = asprintf(&fullname, "%s/%s", tempdir,
2271
direntry->d_name);
2272
if(ret < 0){
2273
perror_plus("asprintf");
2274
continue;
2275
}
2276
ret = remove(fullname);
2277
if(ret == -1){
2278
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2279
strerror(errno));
2280
}
2281
free(fullname);
2282
}
2283
}
2284
2285
/* need to clean even if 0 because man page doesn't specify */
2286
free(direntries);
2287
if (numentries == -1){
2288
perror_plus("scandir");
2289
}
2290
ret = rmdir(tempdir);
2291
if(ret == -1 and errno != ENOENT){
2292
perror_plus("rmdir");
2293
}
2294
}
2295
2296
if(quit_now){
2297
sigemptyset(&old_sigterm_action.sa_mask);
2298
old_sigterm_action.sa_handler = SIG_DFL;
2299
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2300
&old_sigterm_action,
2301
NULL));
2302
if(ret == -1){
2303
perror_plus("sigaction");
2304
}
2305
do {
2306
ret = raise(signal_received);
2307
} while(ret != 0 and errno == EINTR);
2308
if(ret != 0){
2309
perror_plus("raise");
2310
abort();
2311
}
2312
TEMP_FAILURE_RETRY(pause());
2313
}
2314
2315
return exitcode;
864
2316
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0