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237.7.144
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: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2012-06-14 16:11:26 UTC
- mfrom: (237.22.4 client-all-interfaces)
- mto: (301.1.1 release) (237.7.272 trunk)
- mto: This revision was merged to the branch mainline in revision 302.
- Revision ID: teddy@recompile.se-20120614161126-6xkpzbyddk3jm0zt
* plugins.d/mandos-client.c: Use all interfaces.
- 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 © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 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, intptr_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(), _exit() */
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
#include <grp.h> /* setgroups() */
91
#include <argz.h> /* argz_add_sep(), argz_next(),
92
argz_delete(), argz_append(),
93
argz_stringify(), argz_add(),
94
argz_count() */
95
96
#ifdef __linux__
97
#include <sys/klog.h> /* klogctl() */
98
#endif /* __linux__ */
99
100
/* Avahi */
101
/* All Avahi types, constants and functions
102
Avahi*, avahi_*,
103
AVAHI_* */
47
104
#include <avahi-core/core.h>
48
105
#include <avahi-core/lookup.h>
49
106
#include <avahi-core/log.h>
51
108
#include <avahi-common/malloc.h>
52
109
#include <avahi-common/error.h>
53
110
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 */
111
/* GnuTLS */
112
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
113
functions:
114
gnutls_*
115
init_gnutls_session(),
116
GNUTLS_* */
117
#include <gnutls/openpgp.h>
118
/* gnutls_certificate_set_openpgp_key_file(),
119
GNUTLS_OPENPGP_FMT_BASE64 */
60
120
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
121
/* GPGME */
72
#include <errno.h> /* perror() */
73
#include <gpgme.h>
122
#include <gpgme.h> /* All GPGME types, constants and
123
functions:
124
gpgme_*
125
GPGME_PROTOCOL_OpenPGP,
126
GPG_ERR_NO_* */
74
127
75
128
#define BUFFER_SIZE 256
76
129
130
#define PATHDIR "/conf/conf.d/mandos"
131
#define SECKEY "seckey.txt"
132
#define PUBKEY "pubkey.txt"
133
#define HOOKDIR "/lib/mandos/network-hooks.d"
134
77
135
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
136
static const char mandos_protocol_version[] = "1";
137
const char *argp_program_version = "mandos-client " VERSION;
138
const char *argp_program_bug_address = "<mandos@recompile.se>";
139
static const char sys_class_net[] = "/sys/class/net";
140
char *connect_to = NULL;
141
const char *hookdir = HOOKDIR;
142
uid_t uid = 65534;
143
gid_t gid = 65534;
144
145
/* Doubly linked list that need to be circularly linked when used */
146
typedef struct server{
147
const char *ip;
148
uint16_t port;
149
AvahiIfIndex if_index;
150
int af;
151
struct timespec last_seen;
152
struct server *next;
153
struct server *prev;
154
} server;
82
155
83
156
/* Used for passing in values through the Avahi callback functions */
84
157
typedef struct {
88
161
unsigned int dh_bits;
89
162
gnutls_dh_params_t dh_params;
90
163
const char *priority;
164
gpgme_ctx_t ctx;
165
server *current_server;
91
166
} mandos_context;
92
167
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,
97
size_t buffer_capacity){
98
if (buffer_length + BUFFER_SIZE > buffer_capacity){
168
/* global context so signal handler can reach it*/
169
mandos_context mc = { .simple_poll = NULL, .server = NULL,
170
.dh_bits = 1024, .priority = "SECURE256"
171
":!CTYPE-X.509:+CTYPE-OPENPGP",
172
.current_server = NULL };
173
174
sig_atomic_t quit_now = 0;
175
int signal_received = 0;
176
177
/* Function to use when printing errors */
178
void perror_plus(const char *print_text){
179
int e = errno;
180
fprintf(stderr, "Mandos plugin %s: ",
181
program_invocation_short_name);
182
errno = e;
183
perror(print_text);
184
}
185
186
__attribute__((format (gnu_printf, 2, 3)))
187
int fprintf_plus(FILE *stream, const char *format, ...){
188
va_list ap;
189
va_start (ap, format);
190
191
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
192
program_invocation_short_name));
193
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
194
}
195
196
/*
197
* Make additional room in "buffer" for at least BUFFER_SIZE more
198
* bytes. "buffer_capacity" is how much is currently allocated,
199
* "buffer_length" is how much is already used.
200
*/
201
size_t incbuffer(char **buffer, size_t buffer_length,
202
size_t buffer_capacity){
203
if(buffer_length + BUFFER_SIZE > buffer_capacity){
99
204
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
100
if (buffer == NULL){
205
if(buffer == NULL){
101
206
return 0;
102
207
}
103
208
buffer_capacity += BUFFER_SIZE;
105
210
return buffer_capacity;
106
211
}
107
212
213
/* Add server to set of servers to retry periodically */
214
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
215
int af){
216
int ret;
217
server *new_server = malloc(sizeof(server));
218
if(new_server == NULL){
219
perror_plus("malloc");
220
return false;
221
}
222
*new_server = (server){ .ip = strdup(ip),
223
.port = port,
224
.if_index = if_index,
225
.af = af };
226
if(new_server->ip == NULL){
227
perror_plus("strdup");
228
return false;
229
}
230
/* Special case of first server */
231
if (mc.current_server == NULL){
232
new_server->next = new_server;
233
new_server->prev = new_server;
234
mc.current_server = new_server;
235
/* Place the new server last in the list */
236
} else {
237
new_server->next = mc.current_server;
238
new_server->prev = mc.current_server->prev;
239
new_server->prev->next = new_server;
240
mc.current_server->prev = new_server;
241
}
242
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
243
if(ret == -1){
244
perror_plus("clock_gettime");
245
return false;
246
}
247
return true;
248
}
249
108
250
/*
109
* Decrypt OpenPGP data using keyrings in HOMEDIR.
110
* Returns -1 on error
251
* Initialize GPGME.
111
252
*/
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;
253
static bool init_gpgme(const char *seckey, const char *pubkey,
254
const char *tempdir){
118
255
gpgme_error_t rc;
119
ssize_t ret;
120
size_t plaintext_capacity = 0;
121
ssize_t plaintext_length = 0;
122
256
gpgme_engine_info_t engine_info;
123
257
124
if (debug){
125
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
258
259
/*
260
* Helper function to insert pub and seckey to the engine keyring.
261
*/
262
bool import_key(const char *filename){
263
int ret;
264
int fd;
265
gpgme_data_t pgp_data;
266
267
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
268
if(fd == -1){
269
perror_plus("open");
270
return false;
271
}
272
273
rc = gpgme_data_new_from_fd(&pgp_data, fd);
274
if(rc != GPG_ERR_NO_ERROR){
275
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
276
gpgme_strsource(rc), gpgme_strerror(rc));
277
return false;
278
}
279
280
rc = gpgme_op_import(mc.ctx, pgp_data);
281
if(rc != GPG_ERR_NO_ERROR){
282
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
283
gpgme_strsource(rc), gpgme_strerror(rc));
284
return false;
285
}
286
287
ret = (int)TEMP_FAILURE_RETRY(close(fd));
288
if(ret == -1){
289
perror_plus("close");
290
}
291
gpgme_data_release(pgp_data);
292
return true;
293
}
294
295
if(debug){
296
fprintf_plus(stderr, "Initializing GPGME\n");
126
297
}
127
298
128
299
/* Init GPGME */
129
300
gpgme_check_version(NULL);
130
301
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",
133
gpgme_strsource(rc), gpgme_strerror(rc));
134
return -1;
302
if(rc != GPG_ERR_NO_ERROR){
303
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
304
gpgme_strsource(rc), gpgme_strerror(rc));
305
return false;
135
306
}
136
307
137
308
/* 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",
141
gpgme_strsource(rc), gpgme_strerror(rc));
142
return -1;
309
rc = gpgme_get_engine_info(&engine_info);
310
if(rc != GPG_ERR_NO_ERROR){
311
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
312
gpgme_strsource(rc), gpgme_strerror(rc));
313
return false;
143
314
}
144
315
while(engine_info != NULL){
145
316
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
146
317
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
147
engine_info->file_name, homedir);
318
engine_info->file_name, tempdir);
148
319
break;
149
320
}
150
321
engine_info = engine_info->next;
151
322
}
152
323
if(engine_info == NULL){
153
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
154
return -1;
324
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
325
tempdir);
326
return false;
327
}
328
329
/* Create new GPGME "context" */
330
rc = gpgme_new(&(mc.ctx));
331
if(rc != GPG_ERR_NO_ERROR){
332
fprintf_plus(stderr, "Mandos plugin mandos-client: "
333
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
334
gpgme_strerror(rc));
335
return false;
336
}
337
338
if(not import_key(pubkey) or not import_key(seckey)){
339
return false;
340
}
341
342
return true;
343
}
344
345
/*
346
* Decrypt OpenPGP data.
347
* Returns -1 on error
348
*/
349
static ssize_t pgp_packet_decrypt(const char *cryptotext,
350
size_t crypto_size,
351
char **plaintext){
352
gpgme_data_t dh_crypto, dh_plain;
353
gpgme_error_t rc;
354
ssize_t ret;
355
size_t plaintext_capacity = 0;
356
ssize_t plaintext_length = 0;
357
358
if(debug){
359
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
155
360
}
156
361
157
362
/* Create new GPGME data buffer from memory cryptotext */
158
363
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
159
364
0);
160
if (rc != GPG_ERR_NO_ERROR){
161
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
162
gpgme_strsource(rc), gpgme_strerror(rc));
365
if(rc != GPG_ERR_NO_ERROR){
366
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
367
gpgme_strsource(rc), gpgme_strerror(rc));
163
368
return -1;
164
369
}
165
370
166
371
/* Create new empty GPGME data buffer for the plaintext */
167
372
rc = gpgme_data_new(&dh_plain);
168
if (rc != GPG_ERR_NO_ERROR){
169
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
170
gpgme_strsource(rc), gpgme_strerror(rc));
373
if(rc != GPG_ERR_NO_ERROR){
374
fprintf_plus(stderr, "Mandos plugin mandos-client: "
375
"bad gpgme_data_new: %s: %s\n",
376
gpgme_strsource(rc), gpgme_strerror(rc));
171
377
gpgme_data_release(dh_crypto);
172
378
return -1;
173
379
}
174
380
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
381
/* Decrypt data from the cryptotext data buffer to the plaintext
185
382
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",
189
gpgme_strsource(rc), gpgme_strerror(rc));
383
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
384
if(rc != GPG_ERR_NO_ERROR){
385
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
386
gpgme_strsource(rc), gpgme_strerror(rc));
190
387
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){
388
if(debug){
389
gpgme_decrypt_result_t result;
390
result = gpgme_op_decrypt_result(mc.ctx);
391
if(result == NULL){
392
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
393
} else {
394
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
395
result->unsupported_algorithm);
396
fprintf_plus(stderr, "Wrong key usage: %u\n",
397
result->wrong_key_usage);
398
if(result->file_name != NULL){
399
fprintf_plus(stderr, "File name: %s\n", result->file_name);
400
}
401
gpgme_recipient_t recipient;
402
recipient = result->recipients;
214
403
while(recipient != NULL){
215
fprintf(stderr, "Public key algorithm: %s\n",
216
gpgme_pubkey_algo_name(recipient->pubkey_algo));
217
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
218
fprintf(stderr, "Secret key available: %s\n",
219
recipient->status == GPG_ERR_NO_SECKEY
220
? "No" : "Yes");
404
fprintf_plus(stderr, "Public key algorithm: %s\n",
405
gpgme_pubkey_algo_name
406
(recipient->pubkey_algo));
407
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
408
fprintf_plus(stderr, "Secret key available: %s\n",
409
recipient->status == GPG_ERR_NO_SECKEY
410
? "No" : "Yes");
221
411
recipient = recipient->next;
222
412
}
223
413
}
224
414
}
415
goto decrypt_end;
416
}
417
418
if(debug){
419
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
225
420
}
226
421
227
422
/* 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");
423
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
424
perror_plus("gpgme_data_seek");
230
425
plaintext_length = -1;
231
426
goto decrypt_end;
232
427
}
233
428
234
429
*plaintext = NULL;
235
430
while(true){
236
plaintext_capacity = adjustbuffer(plaintext,
237
(size_t)plaintext_length,
238
plaintext_capacity);
239
if (plaintext_capacity == 0){
240
perror("adjustbuffer");
241
plaintext_length = -1;
242
goto decrypt_end;
431
plaintext_capacity = incbuffer(plaintext,
432
(size_t)plaintext_length,
433
plaintext_capacity);
434
if(plaintext_capacity == 0){
435
perror_plus("incbuffer");
436
plaintext_length = -1;
437
goto decrypt_end;
243
438
}
244
439
245
440
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
246
441
BUFFER_SIZE);
247
442
/* Print the data, if any */
248
if (ret == 0){
443
if(ret == 0){
249
444
/* EOF */
250
445
break;
251
446
}
252
447
if(ret < 0){
253
perror("gpgme_data_read");
448
perror_plus("gpgme_data_read");
254
449
plaintext_length = -1;
255
450
goto decrypt_end;
256
451
}
257
452
plaintext_length += ret;
258
453
}
259
454
260
455
if(debug){
261
fprintf(stderr, "Decrypted password is: ");
456
fprintf_plus(stderr, "Decrypted password is: ");
262
457
for(ssize_t i = 0; i < plaintext_length; i++){
263
458
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
264
459
}
275
470
return plaintext_length;
276
471
}
277
472
278
static const char * safer_gnutls_strerror (int value) {
279
const char *ret = gnutls_strerror (value);
280
if (ret == NULL)
473
static const char * safer_gnutls_strerror(int value){
474
const char *ret = gnutls_strerror(value); /* Spurious warning from
475
-Wunreachable-code */
476
if(ret == NULL)
281
477
ret = "(unknown)";
282
478
return ret;
283
479
}
285
481
/* GnuTLS log function callback */
286
482
static void debuggnutls(__attribute__((unused)) int level,
287
483
const char* string){
288
fprintf(stderr, "GnuTLS: %s", string);
484
fprintf_plus(stderr, "GnuTLS: %s", string);
289
485
}
290
486
291
static int init_gnutls_global(mandos_context *mc,
292
const char *pubkeyfile,
293
const char *seckeyfile){
487
static int init_gnutls_global(const char *pubkeyfilename,
488
const char *seckeyfilename){
294
489
int ret;
295
490
296
491
if(debug){
297
fprintf(stderr, "Initializing GnuTLS\n");
492
fprintf_plus(stderr, "Initializing GnuTLS\n");
298
493
}
299
300
if ((ret = gnutls_global_init ())
301
!= GNUTLS_E_SUCCESS) {
302
fprintf (stderr, "GnuTLS global_init: %s\n",
303
safer_gnutls_strerror(ret));
494
495
ret = gnutls_global_init();
496
if(ret != GNUTLS_E_SUCCESS){
497
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
498
safer_gnutls_strerror(ret));
304
499
return -1;
305
500
}
306
501
307
if (debug){
502
if(debug){
308
503
/* "Use a log level over 10 to enable all debugging options."
309
504
* - GnuTLS manual
310
505
*/
313
508
}
314
509
315
510
/* 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));
511
ret = gnutls_certificate_allocate_credentials(&mc.cred);
512
if(ret != GNUTLS_E_SUCCESS){
513
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
514
safer_gnutls_strerror(ret));
515
gnutls_global_deinit();
320
516
return -1;
321
517
}
322
518
323
519
if(debug){
324
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
325
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
326
seckeyfile);
520
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
521
" secret key %s as GnuTLS credentials\n",
522
pubkeyfilename,
523
seckeyfilename);
327
524
}
328
525
329
526
ret = gnutls_certificate_set_openpgp_key_file
330
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
331
if (ret != GNUTLS_E_SUCCESS) {
332
fprintf(stderr,
333
"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;
527
(mc.cred, pubkeyfilename, seckeyfilename,
528
GNUTLS_OPENPGP_FMT_BASE64);
529
if(ret != GNUTLS_E_SUCCESS){
530
fprintf_plus(stderr,
531
"Error[%d] while reading the OpenPGP key pair ('%s',"
532
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
533
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
534
safer_gnutls_strerror(ret));
535
goto globalfail;
338
536
}
339
537
340
538
/* 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
539
ret = gnutls_dh_params_init(&mc.dh_params);
540
if(ret != GNUTLS_E_SUCCESS){
541
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
542
" initialization: %s\n",
543
safer_gnutls_strerror(ret));
544
goto globalfail;
545
}
546
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
547
if(ret != GNUTLS_E_SUCCESS){
548
fprintf_plus(stderr, "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",
366
safer_gnutls_strerror(ret));
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_plus(stderr,
576
"Error in GnuTLS session initialization: %s\n",
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_plus(stderr, "Syntax error at: %s\n", err);
591
fprintf_plus(stderr, "GnuTLS error: %s\n",
592
safer_gnutls_strerror(ret));
593
gnutls_deinit(*session);
376
594
return -1;
377
595
}
378
596
}
379
597
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",
384
safer_gnutls_strerror(ret));
598
do {
599
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
600
mc.cred);
601
if(quit_now){
602
gnutls_deinit(*session);
603
return -1;
604
}
605
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
606
if(ret != GNUTLS_E_SUCCESS){
607
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
608
safer_gnutls_strerror(ret));
609
gnutls_deinit(*session);
385
610
return -1;
386
611
}
387
612
388
613
/* ignore client certificate if any. */
389
gnutls_certificate_server_set_request (*session,
390
GNUTLS_CERT_IGNORE);
614
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
391
615
392
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
616
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
393
617
394
618
return 0;
395
619
}
401
625
/* Called when a Mandos server is found */
402
626
static int start_mandos_communication(const char *ip, uint16_t port,
403
627
AvahiIfIndex if_index,
404
mandos_context *mc){
405
int ret, tcp_sd;
406
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
628
int af){
629
int ret, tcp_sd = -1;
630
ssize_t sret;
631
union {
632
struct sockaddr_in in;
633
struct sockaddr_in6 in6;
634
} to;
407
635
char *buffer = NULL;
408
char *decrypted_buffer;
636
char *decrypted_buffer = NULL;
409
637
size_t buffer_length = 0;
410
638
size_t buffer_capacity = 0;
411
ssize_t decrypted_buffer_size;
412
639
size_t written;
413
int retval = 0;
414
char interface[IF_NAMESIZE];
640
int retval = -1;
415
641
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;
642
int pf; /* Protocol family */
643
644
errno = 0;
645
646
if(quit_now){
647
errno = EINTR;
648
return -1;
649
}
650
651
switch(af){
652
case AF_INET6:
653
pf = PF_INET6;
654
break;
655
case AF_INET:
656
pf = PF_INET;
657
break;
658
default:
659
fprintf_plus(stderr, "Bad address family: %d\n", af);
660
errno = EINVAL;
661
return -1;
662
}
663
664
ret = init_gnutls_session(&session);
665
if(ret != 0){
666
return -1;
667
}
668
669
if(debug){
670
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
671
PRIu16 "\n", ip, port);
672
}
673
674
tcp_sd = socket(pf, SOCK_STREAM, 0);
675
if(tcp_sd < 0){
676
int e = errno;
677
perror_plus("socket");
678
errno = e;
679
goto mandos_end;
680
}
681
682
if(quit_now){
683
errno = EINTR;
684
goto mandos_end;
685
}
686
687
memset(&to, 0, sizeof(to));
688
if(af == AF_INET6){
689
to.in6.sin6_family = (sa_family_t)af;
690
ret = inet_pton(af, ip, &to.in6.sin6_addr);
691
} else { /* IPv4 */
692
to.in.sin_family = (sa_family_t)af;
693
ret = inet_pton(af, ip, &to.in.sin_addr);
694
}
695
if(ret < 0 ){
696
int e = errno;
697
perror_plus("inet_pton");
698
errno = e;
699
goto mandos_end;
449
700
}
450
701
if(ret == 0){
451
fprintf(stderr, "Bad address: %s\n", ip);
452
return -1;
453
}
454
to.in6.sin6_port = htons(port); /* Spurious warning */
702
int e = errno;
703
fprintf_plus(stderr, "Bad address: %s\n", ip);
704
errno = e;
705
goto mandos_end;
706
}
707
if(af == AF_INET6){
708
to.in6.sin6_port = htons(port); /* Spurious warnings from
709
-Wconversion and
710
-Wunreachable-code */
711
712
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
713
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
714
-Wunreachable-code*/
715
if(if_index == AVAHI_IF_UNSPEC){
716
fprintf_plus(stderr, "An IPv6 link-local address is"
717
" incomplete without a network interface\n");
718
errno = EINVAL;
719
goto mandos_end;
720
}
721
/* Set the network interface number as scope */
722
to.in6.sin6_scope_id = (uint32_t)if_index;
723
}
724
} else {
725
to.in.sin_port = htons(port); /* Spurious warnings from
726
-Wconversion and
727
-Wunreachable-code */
728
}
455
729
456
to.in6.sin6_scope_id = (uint32_t)if_index;
730
if(quit_now){
731
errno = EINTR;
732
goto mandos_end;
733
}
457
734
458
735
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");
736
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
737
char interface[IF_NAMESIZE];
738
if(if_indextoname((unsigned int)if_index, interface) == NULL){
739
perror_plus("if_indextoname");
740
} else {
741
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
742
"\n", ip, interface, port);
743
}
744
} else {
745
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
746
ip, port);
747
}
748
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
749
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
750
const char *pcret;
751
if(af == AF_INET6){
752
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
753
sizeof(addrstr));
754
} else {
755
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
756
sizeof(addrstr));
757
}
758
if(pcret == NULL){
759
perror_plus("inet_ntop");
464
760
} else {
465
761
if(strcmp(addrstr, ip) != 0){
466
fprintf(stderr, "Canonical address form: %s\n", addrstr);
762
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
467
763
}
468
764
}
469
765
}
470
766
471
ret = connect(tcp_sd, &to.in, sizeof(to));
472
if (ret < 0){
473
perror("connect");
474
return -1;
475
}
476
767
if(quit_now){
768
errno = EINTR;
769
goto mandos_end;
770
}
771
772
if(af == AF_INET6){
773
ret = connect(tcp_sd, &to.in6, sizeof(to));
774
} else {
775
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
776
}
777
if(ret < 0){
778
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
779
int e = errno;
780
perror_plus("connect");
781
errno = e;
782
}
783
goto mandos_end;
784
}
785
786
if(quit_now){
787
errno = EINTR;
788
goto mandos_end;
789
}
790
477
791
const char *out = mandos_protocol_version;
478
792
written = 0;
479
while (true){
793
while(true){
480
794
size_t out_size = strlen(out);
481
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
482
out_size - written));
483
if (ret == -1){
484
perror("write");
485
retval = -1;
795
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
796
out_size - written));
797
if(ret == -1){
798
int e = errno;
799
perror_plus("write");
800
errno = e;
486
801
goto mandos_end;
487
802
}
488
803
written += (size_t)ret;
489
804
if(written < out_size){
490
805
continue;
491
806
} else {
492
if (out == mandos_protocol_version){
807
if(out == mandos_protocol_version){
493
808
written = 0;
494
809
out = "\r\n";
495
810
} else {
496
811
break;
497
812
}
498
813
}
814
815
if(quit_now){
816
errno = EINTR;
817
goto mandos_end;
818
}
499
819
}
500
820
501
821
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){
822
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
823
}
824
825
if(quit_now){
826
errno = EINTR;
827
goto mandos_end;
828
}
829
830
/* This casting via intptr_t is to eliminate warning about casting
831
an int to a pointer type. This is exactly how the GnuTLS Guile
832
function "set-session-transport-fd!" does it. */
833
gnutls_transport_set_ptr(session,
834
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
835
836
if(quit_now){
837
errno = EINTR;
838
goto mandos_end;
839
}
840
841
do {
842
ret = gnutls_handshake(session);
843
if(quit_now){
844
errno = EINTR;
845
goto mandos_end;
846
}
847
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
848
849
if(ret != GNUTLS_E_SUCCESS){
510
850
if(debug){
511
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
512
gnutls_perror (ret);
851
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
852
gnutls_perror(ret);
513
853
}
514
retval = -1;
854
errno = EPROTO;
515
855
goto mandos_end;
516
856
}
517
857
518
858
/* Read OpenPGP packet that contains the wanted password */
519
859
520
860
if(debug){
521
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
522
ip);
861
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
862
" %s\n", ip);
523
863
}
524
864
525
865
while(true){
526
buffer_capacity = adjustbuffer(&buffer, buffer_length,
527
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){
866
867
if(quit_now){
868
errno = EINTR;
869
goto mandos_end;
870
}
871
872
buffer_capacity = incbuffer(&buffer, buffer_length,
873
buffer_capacity);
874
if(buffer_capacity == 0){
875
int e = errno;
876
perror_plus("incbuffer");
877
errno = e;
878
goto mandos_end;
879
}
880
881
if(quit_now){
882
errno = EINTR;
883
goto mandos_end;
884
}
885
886
sret = gnutls_record_recv(session, buffer+buffer_length,
887
BUFFER_SIZE);
888
if(sret == 0){
537
889
break;
538
890
}
539
if (ret < 0){
540
switch(ret){
891
if(sret < 0){
892
switch(sret){
541
893
case GNUTLS_E_INTERRUPTED:
542
894
case GNUTLS_E_AGAIN:
543
895
break;
544
896
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;
897
do {
898
ret = gnutls_handshake(session);
899
900
if(quit_now){
901
errno = EINTR;
902
goto mandos_end;
903
}
904
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
905
if(ret < 0){
906
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
907
"***\n");
908
gnutls_perror(ret);
909
errno = EPROTO;
550
910
goto mandos_end;
551
911
}
552
912
break;
553
913
default:
554
fprintf(stderr, "Unknown error while reading data from"
555
" encrypted session with Mandos server\n");
556
retval = -1;
557
gnutls_bye (session, GNUTLS_SHUT_RDWR);
914
fprintf_plus(stderr, "Unknown error while reading data from"
915
" encrypted session with Mandos server\n");
916
gnutls_bye(session, GNUTLS_SHUT_RDWR);
917
errno = EIO;
558
918
goto mandos_end;
559
919
}
560
920
} else {
561
buffer_length += (size_t) ret;
921
buffer_length += (size_t) sret;
562
922
}
563
923
}
564
924
565
925
if(debug){
566
fprintf(stderr, "Closing TLS session\n");
567
}
568
569
gnutls_bye (session, GNUTLS_SHUT_RDWR);
570
571
if (buffer_length > 0){
572
decrypted_buffer_size = pgp_packet_decrypt(buffer,
573
buffer_length,
574
&decrypted_buffer,
575
keydir);
576
if (decrypted_buffer_size >= 0){
926
fprintf_plus(stderr, "Closing TLS session\n");
927
}
928
929
if(quit_now){
930
errno = EINTR;
931
goto mandos_end;
932
}
933
934
do {
935
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
936
if(quit_now){
937
errno = EINTR;
938
goto mandos_end;
939
}
940
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
941
942
if(buffer_length > 0){
943
ssize_t decrypted_buffer_size;
944
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
945
&decrypted_buffer);
946
if(decrypted_buffer_size >= 0){
947
577
948
written = 0;
578
949
while(written < (size_t) decrypted_buffer_size){
579
ret = (int)fwrite (decrypted_buffer + written, 1,
580
(size_t)decrypted_buffer_size - written,
581
stdout);
950
if(quit_now){
951
errno = EINTR;
952
goto mandos_end;
953
}
954
955
ret = (int)fwrite(decrypted_buffer + written, 1,
956
(size_t)decrypted_buffer_size - written,
957
stdout);
582
958
if(ret == 0 and ferror(stdout)){
959
int e = errno;
583
960
if(debug){
584
fprintf(stderr, "Error writing encrypted data: %s\n",
585
strerror(errno));
961
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
962
strerror(errno));
586
963
}
587
retval = -1;
588
break;
964
errno = e;
965
goto mandos_end;
589
966
}
590
967
written += (size_t)ret;
591
968
}
592
free(decrypted_buffer);
593
} else {
594
retval = -1;
969
retval = 0;
595
970
}
596
971
}
597
972
598
973
/* Shutdown procedure */
599
974
600
975
mandos_end:
601
free(buffer);
602
close(tcp_sd);
603
gnutls_deinit (session);
604
gnutls_certificate_free_credentials (mc->cred);
605
gnutls_global_deinit ();
976
{
977
int e = errno;
978
free(decrypted_buffer);
979
free(buffer);
980
if(tcp_sd >= 0){
981
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
982
}
983
if(ret == -1){
984
if(e == 0){
985
e = errno;
986
}
987
perror_plus("close");
988
}
989
gnutls_deinit(session);
990
errno = e;
991
if(quit_now){
992
errno = EINTR;
993
retval = -1;
994
}
995
}
606
996
return retval;
607
997
}
608
998
609
999
static void resolve_callback(AvahiSServiceResolver *r,
610
1000
AvahiIfIndex interface,
611
AVAHI_GCC_UNUSED AvahiProtocol protocol,
1001
AvahiProtocol proto,
612
1002
AvahiResolverEvent event,
613
1003
const char *name,
614
1004
const char *type,
619
1009
AVAHI_GCC_UNUSED AvahiStringList *txt,
620
1010
AVAHI_GCC_UNUSED AvahiLookupResultFlags
621
1011
flags,
622
void* userdata) {
623
mandos_context *mc = userdata;
624
assert(r); /* Spurious warning */
1012
AVAHI_GCC_UNUSED void* userdata){
1013
assert(r);
625
1014
626
1015
/* Called whenever a service has been resolved successfully or
627
1016
timed out */
628
1017
629
switch (event) {
1018
if(quit_now){
1019
return;
1020
}
1021
1022
switch(event){
630
1023
default:
631
1024
case AVAHI_RESOLVER_FAILURE:
632
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
633
" of type '%s' in domain '%s': %s\n", name, type, domain,
634
avahi_strerror(avahi_server_errno(mc->server)));
1025
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1026
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1027
domain,
1028
avahi_strerror(avahi_server_errno(mc.server)));
635
1029
break;
636
1030
637
1031
case AVAHI_RESOLVER_FOUND:
639
1033
char ip[AVAHI_ADDRESS_STR_MAX];
640
1034
avahi_address_snprint(ip, sizeof(ip), address);
641
1035
if(debug){
642
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %d) on"
643
" port %d\n", name, host_name, ip, interface, port);
1036
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1037
PRIdMAX ") on port %" PRIu16 "\n", name,
1038
host_name, ip, (intmax_t)interface, port);
644
1039
}
645
int ret = start_mandos_communication(ip, port, interface, mc);
646
if (ret == 0){
647
exit(EXIT_SUCCESS);
1040
int ret = start_mandos_communication(ip, port, interface,
1041
avahi_proto_to_af(proto));
1042
if(ret == 0){
1043
avahi_simple_poll_quit(mc.simple_poll);
1044
} else {
1045
if(not add_server(ip, port, interface,
1046
avahi_proto_to_af(proto))){
1047
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1048
" list\n", name);
1049
}
648
1050
}
649
1051
}
650
1052
}
651
1053
avahi_s_service_resolver_free(r);
652
1054
}
653
1055
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 */
1056
static void browse_callback(AvahiSServiceBrowser *b,
1057
AvahiIfIndex interface,
1058
AvahiProtocol protocol,
1059
AvahiBrowserEvent event,
1060
const char *name,
1061
const char *type,
1062
const char *domain,
1063
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1064
flags,
1065
AVAHI_GCC_UNUSED void* userdata){
1066
assert(b);
666
1067
667
1068
/* Called whenever a new services becomes available on the LAN or
668
1069
is removed from the LAN */
669
1070
670
switch (event) {
1071
if(quit_now){
1072
return;
1073
}
1074
1075
switch(event){
671
1076
default:
672
1077
case AVAHI_BROWSER_FAILURE:
673
1078
674
fprintf(stderr, "(Avahi browser) %s\n",
675
avahi_strerror(avahi_server_errno(mc->server)));
676
avahi_simple_poll_quit(mc->simple_poll);
1079
fprintf_plus(stderr, "(Avahi browser) %s\n",
1080
avahi_strerror(avahi_server_errno(mc.server)));
1081
avahi_simple_poll_quit(mc.simple_poll);
677
1082
return;
678
1083
679
1084
case AVAHI_BROWSER_NEW:
682
1087
the callback function is called the Avahi server will free the
683
1088
resolver for us. */
684
1089
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)));
1090
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1091
name, type, domain, protocol, 0,
1092
resolve_callback, NULL) == NULL)
1093
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1094
" %s\n", name,
1095
avahi_strerror(avahi_server_errno(mc.server)));
691
1096
break;
692
1097
693
1098
case AVAHI_BROWSER_REMOVE:
696
1101
case AVAHI_BROWSER_ALL_FOR_NOW:
697
1102
case AVAHI_BROWSER_CACHE_EXHAUSTED:
698
1103
if(debug){
699
fprintf(stderr, "No Mandos server found, still searching...\n");
1104
fprintf_plus(stderr, "No Mandos server found, still"
1105
" searching...\n");
700
1106
}
701
1107
break;
702
1108
}
703
1109
}
704
1110
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
1111
/* Signal handler that stops main loop after SIGTERM */
1112
static void handle_sigterm(int sig){
1113
if(quit_now){
1114
return;
1115
}
1116
quit_now = 1;
1117
signal_received = sig;
1118
int old_errno = errno;
1119
/* set main loop to exit */
1120
if(mc.simple_poll != NULL){
1121
avahi_simple_poll_quit(mc.simple_poll);
1122
}
1123
errno = old_errno;
1124
}
1125
1126
bool get_flags(const char *ifname, struct ifreq *ifr){
1127
int ret;
1128
error_t ret_errno;
1129
1130
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1131
if(s < 0){
1132
ret_errno = errno;
1133
perror_plus("socket");
1134
errno = ret_errno;
1135
return false;
1136
}
1137
strcpy(ifr->ifr_name, ifname);
1138
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1139
if(ret == -1){
1140
if(debug){
1141
ret_errno = errno;
1142
perror_plus("ioctl SIOCGIFFLAGS");
1143
errno = ret_errno;
1144
}
1145
return false;
1146
}
1147
return true;
1148
}
1149
1150
bool good_flags(const char *ifname, const struct ifreq *ifr){
1151
1152
/* Reject the loopback device */
1153
if(ifr->ifr_flags & IFF_LOOPBACK){
1154
if(debug){
1155
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1156
ifname);
1157
}
1158
return false;
1159
}
1160
/* Accept point-to-point devices only if connect_to is specified */
1161
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1162
if(debug){
1163
fprintf_plus(stderr, "Accepting point-to-point interface"
1164
" \"%s\"\n", ifname);
1165
}
1166
return true;
1167
}
1168
/* Otherwise, reject non-broadcast-capable devices */
1169
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1170
if(debug){
1171
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1172
" \"%s\"\n", ifname);
1173
}
1174
return false;
1175
}
1176
/* Reject non-ARP interfaces (including dummy interfaces) */
1177
if(ifr->ifr_flags & IFF_NOARP){
1178
if(debug){
1179
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1180
ifname);
1181
}
1182
return false;
1183
}
1184
1185
/* Accept this device */
1186
if(debug){
1187
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1188
}
1189
return true;
1190
}
1191
1192
/*
1193
* This function determines if a directory entry in /sys/class/net
1194
* corresponds to an acceptable network device.
1195
* (This function is passed to scandir(3) as a filter function.)
1196
*/
1197
int good_interface(const struct dirent *if_entry){
1198
if(if_entry->d_name[0] == '.'){
1199
return 0;
1200
}
1201
1202
struct ifreq ifr;
1203
if(not get_flags(if_entry->d_name, &ifr)){
1204
if(debug){
1205
fprintf_plus(stderr, "Failed to get flags for interface "
1206
"\"%s\"\n", if_entry->d_name);
1207
}
1208
return 0;
1209
}
1210
1211
if(not good_flags(if_entry->d_name, &ifr)){
1212
return 0;
1213
}
1214
return 1;
1215
}
1216
1217
/*
1218
* This function determines if a network interface is up.
1219
*/
1220
bool interface_is_up(const char *interface){
1221
struct ifreq ifr;
1222
if(not get_flags(interface, &ifr)){
1223
if(debug){
1224
fprintf_plus(stderr, "Failed to get flags for interface "
1225
"\"%s\"\n", interface);
1226
}
1227
return false;
1228
}
1229
1230
return (bool)(ifr.ifr_flags & IFF_UP);
1231
}
1232
1233
/*
1234
* This function determines if a network interface is running
1235
*/
1236
bool interface_is_running(const char *interface){
1237
struct ifreq ifr;
1238
if(not get_flags(interface, &ifr)){
1239
if(debug){
1240
fprintf_plus(stderr, "Failed to get flags for interface "
1241
"\"%s\"\n", interface);
1242
}
1243
return false;
1244
}
1245
1246
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1247
}
1248
1249
int notdotentries(const struct dirent *direntry){
1250
/* Skip "." and ".." */
1251
if(direntry->d_name[0] == '.'
1252
and (direntry->d_name[1] == '\0'
1253
or (direntry->d_name[1] == '.'
1254
and direntry->d_name[2] == '\0'))){
1255
return 0;
1256
}
1257
return 1;
1258
}
1259
1260
/* Is this directory entry a runnable program? */
1261
int runnable_hook(const struct dirent *direntry){
1262
int ret;
1263
size_t sret;
1264
struct stat st;
1265
1266
if((direntry->d_name)[0] == '\0'){
1267
/* Empty name? */
1268
return 0;
1269
}
1270
1271
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1272
"abcdefghijklmnopqrstuvwxyz"
1273
"0123456789"
1274
"_-");
1275
if((direntry->d_name)[sret] != '\0'){
1276
/* Contains non-allowed characters */
1277
if(debug){
1278
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1279
direntry->d_name);
1280
}
1281
return 0;
1282
}
1283
1284
char *fullname = NULL;
1285
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1286
if(ret < 0){
1287
perror_plus("asprintf");
1288
return 0;
1289
}
1290
1291
ret = stat(fullname, &st);
1292
if(ret == -1){
1293
if(debug){
1294
perror_plus("Could not stat hook");
1295
}
1296
return 0;
1297
}
1298
if(not (S_ISREG(st.st_mode))){
1299
/* Not a regular file */
1300
if(debug){
1301
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1302
direntry->d_name);
1303
}
1304
return 0;
1305
}
1306
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1307
/* Not executable */
1308
if(debug){
1309
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1310
direntry->d_name);
1311
}
1312
return 0;
1313
}
1314
if(debug){
1315
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1316
direntry->d_name);
1317
}
1318
return 1;
1319
}
1320
1321
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1322
int ret;
1323
struct timespec now;
1324
struct timespec waited_time;
1325
intmax_t block_time;
1326
1327
while(true){
1328
if(mc.current_server == NULL){
1329
if (debug){
1330
fprintf_plus(stderr, "Wait until first server is found."
1331
" No timeout!\n");
1332
}
1333
ret = avahi_simple_poll_iterate(s, -1);
1334
} else {
1335
if (debug){
1336
fprintf_plus(stderr, "Check current_server if we should run"
1337
" it, or wait\n");
1338
}
1339
/* the current time */
1340
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1341
if(ret == -1){
1342
perror_plus("clock_gettime");
1343
return -1;
1344
}
1345
/* Calculating in ms how long time between now and server
1346
who we visted longest time ago. Now - last seen. */
1347
waited_time.tv_sec = (now.tv_sec
1348
- mc.current_server->last_seen.tv_sec);
1349
waited_time.tv_nsec = (now.tv_nsec
1350
- mc.current_server->last_seen.tv_nsec);
1351
/* total time is 10s/10,000ms.
1352
Converting to s from ms by dividing by 1,000,
1353
and ns to ms by dividing by 1,000,000. */
1354
block_time = ((retry_interval
1355
- ((intmax_t)waited_time.tv_sec * 1000))
1356
- ((intmax_t)waited_time.tv_nsec / 1000000));
1357
1358
if (debug){
1359
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1360
block_time);
1361
}
1362
1363
if(block_time <= 0){
1364
ret = start_mandos_communication(mc.current_server->ip,
1365
mc.current_server->port,
1366
mc.current_server->if_index,
1367
mc.current_server->af);
1368
if(ret == 0){
1369
avahi_simple_poll_quit(mc.simple_poll);
1370
return 0;
1371
}
1372
ret = clock_gettime(CLOCK_MONOTONIC,
1373
&mc.current_server->last_seen);
1374
if(ret == -1){
1375
perror_plus("clock_gettime");
1376
return -1;
1377
}
1378
mc.current_server = mc.current_server->next;
1379
block_time = 0; /* Call avahi to find new Mandos
1380
servers, but don't block */
1381
}
1382
1383
ret = avahi_simple_poll_iterate(s, (int)block_time);
1384
}
1385
if(ret != 0){
1386
if (ret > 0 or errno != EINTR){
1387
return (ret != 1) ? ret : 0;
1388
}
1389
}
1390
}
1391
}
1392
1393
/* Set effective uid to 0, return errno */
1394
error_t raise_privileges(void){
1395
error_t old_errno = errno;
1396
error_t ret_errno = 0;
1397
if(seteuid(0) == -1){
1398
ret_errno = errno;
1399
perror_plus("seteuid");
1400
}
1401
errno = old_errno;
1402
return ret_errno;
1403
}
1404
1405
/* Set effective and real user ID to 0. Return errno. */
1406
error_t raise_privileges_permanently(void){
1407
error_t old_errno = errno;
1408
error_t ret_errno = raise_privileges();
1409
if(ret_errno != 0){
1410
errno = old_errno;
1411
return ret_errno;
1412
}
1413
if(setuid(0) == -1){
1414
ret_errno = errno;
1415
perror_plus("seteuid");
1416
}
1417
errno = old_errno;
1418
return ret_errno;
1419
}
1420
1421
/* Set effective user ID to unprivileged saved user ID */
1422
error_t lower_privileges(void){
1423
error_t old_errno = errno;
1424
error_t ret_errno = 0;
1425
if(seteuid(uid) == -1){
1426
ret_errno = errno;
1427
perror_plus("seteuid");
1428
}
1429
errno = old_errno;
1430
return ret_errno;
1431
}
1432
1433
/* Lower privileges permanently */
1434
error_t lower_privileges_permanently(void){
1435
error_t old_errno = errno;
1436
error_t ret_errno = 0;
1437
if(setuid(uid) == -1){
1438
ret_errno = errno;
1439
perror_plus("setuid");
1440
}
1441
errno = old_errno;
1442
return ret_errno;
1443
}
1444
1445
bool run_network_hooks(const char *mode, const char *interface,
1446
const float delay){
1447
struct dirent **direntries;
1448
struct dirent *direntry;
1449
int ret;
1450
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1451
alphasort);
1452
if(numhooks == -1){
1453
perror_plus("scandir");
1454
} else {
1455
int devnull = open("/dev/null", O_RDONLY);
1456
for(int i = 0; i < numhooks; i++){
1457
direntry = direntries[i];
1458
char *fullname = NULL;
1459
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1460
if(ret < 0){
1461
perror_plus("asprintf");
1462
continue;
1463
}
1464
if(debug){
1465
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1466
direntry->d_name);
1467
}
1468
pid_t hook_pid = fork();
1469
if(hook_pid == 0){
1470
/* Child */
1471
/* Raise privileges */
1472
raise_privileges_permanently();
1473
/* Set group */
1474
errno = 0;
1475
ret = setgid(0);
1476
if(ret == -1){
1477
perror_plus("setgid");
1478
}
1479
/* Reset supplementary groups */
1480
errno = 0;
1481
ret = setgroups(0, NULL);
1482
if(ret == -1){
1483
perror_plus("setgroups");
1484
}
1485
dup2(devnull, STDIN_FILENO);
1486
close(devnull);
1487
dup2(STDERR_FILENO, STDOUT_FILENO);
1488
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1489
if(ret == -1){
1490
perror_plus("setenv");
1491
_exit(EX_OSERR);
1492
}
1493
ret = setenv("DEVICE", interface, 1);
1494
if(ret == -1){
1495
perror_plus("setenv");
1496
_exit(EX_OSERR);
1497
}
1498
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1499
if(ret == -1){
1500
perror_plus("setenv");
1501
_exit(EX_OSERR);
1502
}
1503
ret = setenv("MODE", mode, 1);
1504
if(ret == -1){
1505
perror_plus("setenv");
1506
_exit(EX_OSERR);
1507
}
1508
char *delaystring;
1509
ret = asprintf(&delaystring, "%f", delay);
1510
if(ret == -1){
1511
perror_plus("asprintf");
1512
_exit(EX_OSERR);
1513
}
1514
ret = setenv("DELAY", delaystring, 1);
1515
if(ret == -1){
1516
free(delaystring);
1517
perror_plus("setenv");
1518
_exit(EX_OSERR);
1519
}
1520
free(delaystring);
1521
if(connect_to != NULL){
1522
ret = setenv("CONNECT", connect_to, 1);
1523
if(ret == -1){
1524
perror_plus("setenv");
1525
_exit(EX_OSERR);
1526
}
1527
}
1528
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1529
perror_plus("execl");
1530
_exit(EXIT_FAILURE);
1531
}
1532
} else {
1533
int status;
1534
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1535
perror_plus("waitpid");
1536
free(fullname);
1537
continue;
1538
}
1539
if(WIFEXITED(status)){
1540
if(WEXITSTATUS(status) != 0){
1541
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1542
" with status %d\n", direntry->d_name,
1543
WEXITSTATUS(status));
1544
free(fullname);
1545
continue;
1546
}
1547
} else if(WIFSIGNALED(status)){
1548
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1549
" signal %d\n", direntry->d_name,
1550
WTERMSIG(status));
1551
free(fullname);
1552
continue;
1553
} else {
1554
fprintf_plus(stderr, "Warning: network hook \"%s\""
1555
" crashed\n", direntry->d_name);
1556
free(fullname);
1557
continue;
1558
}
1559
}
1560
free(fullname);
1561
if(debug){
1562
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1563
direntry->d_name);
1564
}
1565
}
1566
close(devnull);
1567
}
1568
return true;
1569
}
1570
1571
error_t bring_up_interface(const char *const interface,
1572
const float delay){
1573
int sd = -1;
1574
error_t old_errno = errno;
1575
error_t ret_errno = 0;
1576
int ret, ret_setflags;
1577
struct ifreq network;
1578
unsigned int if_index = if_nametoindex(interface);
1579
if(if_index == 0){
1580
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1581
errno = old_errno;
1582
return ENXIO;
1583
}
1584
1585
if(quit_now){
1586
errno = old_errno;
1587
return EINTR;
1588
}
1589
1590
if(not interface_is_up(interface)){
1591
if(not get_flags(interface, &network) and debug){
1592
ret_errno = errno;
1593
fprintf_plus(stderr, "Failed to get flags for interface "
1594
"\"%s\"\n", interface);
1595
return ret_errno;
1596
}
1597
network.ifr_flags |= IFF_UP;
1598
1599
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1600
if(sd < 0){
1601
ret_errno = errno;
1602
perror_plus("socket");
1603
errno = old_errno;
1604
return ret_errno;
1605
}
1606
1607
if(quit_now){
1608
close(sd);
1609
errno = old_errno;
1610
return EINTR;
1611
}
1612
1613
if(debug){
1614
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1615
interface);
1616
}
1617
1618
/* Raise priviliges */
1619
raise_privileges();
1620
1621
#ifdef __linux__
1622
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1623
messages about the network interface to mess up the prompt */
1624
int ret_linux = klogctl(8, NULL, 5);
1625
bool restore_loglevel = true;
1626
if(ret_linux == -1){
1627
restore_loglevel = false;
1628
perror_plus("klogctl");
1629
}
1630
#endif /* __linux__ */
1631
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1632
ret_errno = errno;
1633
#ifdef __linux__
1634
if(restore_loglevel){
1635
ret_linux = klogctl(7, NULL, 0);
1636
if(ret_linux == -1){
1637
perror_plus("klogctl");
1638
}
1639
}
1640
#endif /* __linux__ */
1641
1642
/* Lower privileges */
1643
lower_privileges();
1644
1645
/* Close the socket */
1646
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1647
if(ret == -1){
1648
perror_plus("close");
1649
}
1650
1651
if(ret_setflags == -1){
1652
errno = ret_errno;
1653
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1654
errno = old_errno;
1655
return ret_errno;
1656
}
1657
} else if(debug){
1658
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1659
interface);
1660
}
1661
1662
/* Sleep checking until interface is running.
1663
Check every 0.25s, up to total time of delay */
1664
for(int i=0; i < delay * 4; i++){
1665
if(interface_is_running(interface)){
1666
break;
1667
}
1668
struct timespec sleeptime = { .tv_nsec = 250000000 };
1669
ret = nanosleep(&sleeptime, NULL);
1670
if(ret == -1 and errno != EINTR){
1671
perror_plus("nanosleep");
1672
}
1673
}
1674
1675
errno = old_errno;
1676
return 0;
1677
}
1678
1679
error_t take_down_interface(const char *const interface){
1680
int sd = -1;
1681
error_t old_errno = errno;
1682
error_t ret_errno = 0;
1683
int ret, ret_setflags;
1684
struct ifreq network;
1685
unsigned int if_index = if_nametoindex(interface);
1686
if(if_index == 0){
1687
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1688
errno = old_errno;
1689
return ENXIO;
1690
}
1691
if(interface_is_up(interface)){
1692
if(not get_flags(interface, &network) and debug){
1693
ret_errno = errno;
1694
fprintf_plus(stderr, "Failed to get flags for interface "
1695
"\"%s\"\n", interface);
1696
return ret_errno;
1697
}
1698
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1699
1700
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1701
if(sd < 0){
1702
ret_errno = errno;
1703
perror_plus("socket");
1704
errno = old_errno;
1705
return ret_errno;
1706
}
1707
1708
if(debug){
1709
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1710
interface);
1711
}
1712
1713
/* Raise priviliges */
1714
raise_privileges();
1715
1716
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1717
ret_errno = errno;
1718
1719
/* Lower privileges */
1720
lower_privileges();
1721
1722
/* Close the socket */
1723
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1724
if(ret == -1){
1725
perror_plus("close");
1726
}
1727
1728
if(ret_setflags == -1){
1729
errno = ret_errno;
1730
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1731
errno = old_errno;
1732
return ret_errno;
1733
}
1734
} else if(debug){
1735
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1736
interface);
1737
}
1738
1739
errno = old_errno;
1740
return 0;
1741
}
725
1742
726
1743
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");
1744
AvahiSServiceBrowser *sb = NULL;
1745
error_t ret_errno;
1746
int ret;
1747
intmax_t tmpmax;
1748
char *tmp;
1749
int exitcode = EXIT_SUCCESS;
1750
char *interfaces = NULL;
1751
size_t interfaces_size = 0;
1752
char *interfaces_to_take_down = NULL;
1753
size_t interfaces_to_take_down_size = 0;
1754
char tempdir[] = "/tmp/mandosXXXXXX";
1755
bool tempdir_created = false;
1756
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1757
const char *seckey = PATHDIR "/" SECKEY;
1758
const char *pubkey = PATHDIR "/" PUBKEY;
1759
char *interfaces_hooks = NULL;
1760
size_t interfaces_hooks_size = 0;
1761
1762
bool gnutls_initialized = false;
1763
bool gpgme_initialized = false;
1764
float delay = 2.5f;
1765
double retry_interval = 10; /* 10s between trying a server and
1766
retrying the same server again */
1767
1768
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1769
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1770
1771
uid = getuid();
1772
gid = getgid();
1773
1774
/* Lower any group privileges we might have, just to be safe */
1775
errno = 0;
1776
ret = setgid(gid);
1777
if(ret == -1){
1778
perror_plus("setgid");
1779
}
1780
1781
/* Lower user privileges (temporarily) */
1782
errno = 0;
1783
ret = seteuid(uid);
1784
if(ret == -1){
1785
perror_plus("seteuid");
1786
}
1787
1788
if(quit_now){
1789
goto end;
1790
}
1791
1792
{
1793
struct argp_option options[] = {
1794
{ .name = "debug", .key = 128,
1795
.doc = "Debug mode", .group = 3 },
1796
{ .name = "connect", .key = 'c',
1797
.arg = "ADDRESS:PORT",
1798
.doc = "Connect directly to a specific Mandos server",
1799
.group = 1 },
1800
{ .name = "interface", .key = 'i',
1801
.arg = "NAME",
1802
.doc = "Network interface that will be used to search for"
1803
" Mandos servers",
1804
.group = 1 },
1805
{ .name = "seckey", .key = 's',
1806
.arg = "FILE",
1807
.doc = "OpenPGP secret key file base name",
1808
.group = 1 },
1809
{ .name = "pubkey", .key = 'p',
1810
.arg = "FILE",
1811
.doc = "OpenPGP public key file base name",
1812
.group = 2 },
1813
{ .name = "dh-bits", .key = 129,
1814
.arg = "BITS",
1815
.doc = "Bit length of the prime number used in the"
1816
" Diffie-Hellman key exchange",
1817
.group = 2 },
1818
{ .name = "priority", .key = 130,
1819
.arg = "STRING",
1820
.doc = "GnuTLS priority string for the TLS handshake",
1821
.group = 1 },
1822
{ .name = "delay", .key = 131,
1823
.arg = "SECONDS",
1824
.doc = "Maximum delay to wait for interface startup",
1825
.group = 2 },
1826
{ .name = "retry", .key = 132,
1827
.arg = "SECONDS",
1828
.doc = "Retry interval used when denied by the Mandos server",
1829
.group = 2 },
1830
{ .name = "network-hook-dir", .key = 133,
1831
.arg = "DIR",
1832
.doc = "Directory where network hooks are located",
1833
.group = 2 },
1834
/*
1835
* These reproduce what we would get without ARGP_NO_HELP
1836
*/
1837
{ .name = "help", .key = '?',
1838
.doc = "Give this help list", .group = -1 },
1839
{ .name = "usage", .key = -3,
1840
.doc = "Give a short usage message", .group = -1 },
1841
{ .name = "version", .key = 'V',
1842
.doc = "Print program version", .group = -1 },
1843
{ .name = NULL }
1844
};
1845
1846
error_t parse_opt(int key, char *arg,
1847
struct argp_state *state){
1848
errno = 0;
1849
switch(key){
1850
case 128: /* --debug */
1851
debug = true;
1852
break;
1853
case 'c': /* --connect */
1854
connect_to = arg;
1855
break;
1856
case 'i': /* --interface */
1857
ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,
1858
(int)',');
1859
if(ret_errno != 0){
1860
argp_error(state, "%s", strerror(ret_errno));
1861
}
1862
break;
1863
case 's': /* --seckey */
1864
seckey = arg;
1865
break;
1866
case 'p': /* --pubkey */
1867
pubkey = arg;
1868
break;
1869
case 129: /* --dh-bits */
1870
errno = 0;
1871
tmpmax = strtoimax(arg, &tmp, 10);
1872
if(errno != 0 or tmp == arg or *tmp != '\0'
1873
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1874
argp_error(state, "Bad number of DH bits");
1875
}
1876
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1877
break;
1878
case 130: /* --priority */
1879
mc.priority = arg;
1880
break;
1881
case 131: /* --delay */
1882
errno = 0;
1883
delay = strtof(arg, &tmp);
1884
if(errno != 0 or tmp == arg or *tmp != '\0'){
1885
argp_error(state, "Bad delay");
1886
}
1887
case 132: /* --retry */
1888
errno = 0;
1889
retry_interval = strtod(arg, &tmp);
1890
if(errno != 0 or tmp == arg or *tmp != '\0'
1891
or (retry_interval * 1000) > INT_MAX
1892
or retry_interval < 0){
1893
argp_error(state, "Bad retry interval");
1894
}
1895
break;
1896
case 133: /* --network-hook-dir */
1897
hookdir = arg;
1898
break;
1899
/*
1900
* These reproduce what we would get without ARGP_NO_HELP
1901
*/
1902
case '?': /* --help */
1903
argp_state_help(state, state->out_stream,
1904
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1905
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1906
case -3: /* --usage */
1907
argp_state_help(state, state->out_stream,
1908
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1909
case 'V': /* --version */
1910
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1911
exit(argp_err_exit_status);
1912
break;
1913
default:
1914
return ARGP_ERR_UNKNOWN;
1915
}
1916
return errno;
1917
}
1918
1919
struct argp argp = { .options = options, .parser = parse_opt,
1920
.args_doc = "",
1921
.doc = "Mandos client -- Get and decrypt"
1922
" passwords from a Mandos server" };
1923
ret = argp_parse(&argp, argc, argv,
1924
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1925
switch(ret){
1926
case 0:
1927
break;
1928
case ENOMEM:
1929
default:
1930
errno = ret;
1931
perror_plus("argp_parse");
1932
exitcode = EX_OSERR;
1933
goto end;
1934
case EINVAL:
1935
exitcode = EX_USAGE;
1936
goto end;
1937
}
1938
}
1939
1940
{
1941
/* Work around Debian bug #633582:
1942
<http://bugs.debian.org/633582> */
1943
1944
/* Re-raise priviliges */
1945
if(raise_privileges() == 0){
1946
struct stat st;
1947
1948
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1949
int seckey_fd = open(seckey, O_RDONLY);
1950
if(seckey_fd == -1){
1951
perror_plus("open");
1952
} else {
1953
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1954
if(ret == -1){
1955
perror_plus("fstat");
1956
} else {
1957
if(S_ISREG(st.st_mode)
1958
and st.st_uid == 0 and st.st_gid == 0){
1959
ret = fchown(seckey_fd, uid, gid);
1960
if(ret == -1){
1961
perror_plus("fchown");
1962
}
1963
}
1964
}
1965
TEMP_FAILURE_RETRY(close(seckey_fd));
1966
}
1967
}
1968
1969
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1970
int pubkey_fd = open(pubkey, O_RDONLY);
1971
if(pubkey_fd == -1){
1972
perror_plus("open");
1973
} else {
1974
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1975
if(ret == -1){
1976
perror_plus("fstat");
1977
} else {
1978
if(S_ISREG(st.st_mode)
1979
and st.st_uid == 0 and st.st_gid == 0){
1980
ret = fchown(pubkey_fd, uid, gid);
1981
if(ret == -1){
1982
perror_plus("fchown");
1983
}
1984
}
1985
}
1986
TEMP_FAILURE_RETRY(close(pubkey_fd));
1987
}
1988
}
1989
1990
/* Lower privileges */
1991
errno = 0;
1992
ret = seteuid(uid);
1993
if(ret == -1){
1994
perror_plus("seteuid");
1995
}
1996
}
1997
}
1998
1999
/* Remove empty interface names */
2000
{
2001
char *interface = NULL;
2002
while((interface = argz_next(interfaces, interfaces_size,
2003
interface))){
2004
if(if_nametoindex(interface) == 0){
2005
if(interface[0] != '\0' and strcmp(interface, "none") != 0){
2006
fprintf_plus(stderr, "Not using nonexisting interface"
2007
" \"%s\"\n", interface);
2008
}
2009
argz_delete(&interfaces, &interfaces_size, interface);
2010
interface = NULL;
2011
}
2012
}
2013
}
2014
2015
/* Run network hooks */
2016
{
2017
ret_errno = argz_append(&interfaces_hooks, &interfaces_hooks_size,
2018
interfaces, interfaces_size);
2019
if(ret_errno != 0){
2020
errno = ret_errno;
2021
perror_plus("argz_append");
2022
goto end;
2023
}
2024
argz_stringify(interfaces_hooks, interfaces_hooks_size, (int)',');
2025
if(not run_network_hooks("start", interfaces_hooks, delay)){
2026
goto end;
2027
}
2028
}
2029
2030
if(not debug){
2031
avahi_set_log_function(empty_log);
2032
}
2033
2034
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2035
from the signal handler */
2036
/* Initialize the pseudo-RNG for Avahi */
2037
srand((unsigned int) time(NULL));
2038
mc.simple_poll = avahi_simple_poll_new();
2039
if(mc.simple_poll == NULL){
2040
fprintf_plus(stderr,
2041
"Avahi: Failed to create simple poll object.\n");
2042
exitcode = EX_UNAVAILABLE;
2043
goto end;
2044
}
2045
2046
sigemptyset(&sigterm_action.sa_mask);
2047
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2048
if(ret == -1){
2049
perror_plus("sigaddset");
2050
exitcode = EX_OSERR;
2051
goto end;
2052
}
2053
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2054
if(ret == -1){
2055
perror_plus("sigaddset");
2056
exitcode = EX_OSERR;
2057
goto end;
2058
}
2059
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2060
if(ret == -1){
2061
perror_plus("sigaddset");
2062
exitcode = EX_OSERR;
2063
goto end;
2064
}
2065
/* Need to check if the handler is SIG_IGN before handling:
2066
| [[info:libc:Initial Signal Actions]] |
2067
| [[info:libc:Basic Signal Handling]] |
2068
*/
2069
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2070
if(ret == -1){
2071
perror_plus("sigaction");
2072
return EX_OSERR;
2073
}
2074
if(old_sigterm_action.sa_handler != SIG_IGN){
2075
ret = sigaction(SIGINT, &sigterm_action, NULL);
2076
if(ret == -1){
2077
perror_plus("sigaction");
2078
exitcode = EX_OSERR;
2079
goto end;
2080
}
2081
}
2082
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2083
if(ret == -1){
2084
perror_plus("sigaction");
2085
return EX_OSERR;
2086
}
2087
if(old_sigterm_action.sa_handler != SIG_IGN){
2088
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2089
if(ret == -1){
2090
perror_plus("sigaction");
2091
exitcode = EX_OSERR;
2092
goto end;
2093
}
2094
}
2095
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2096
if(ret == -1){
2097
perror_plus("sigaction");
2098
return EX_OSERR;
2099
}
2100
if(old_sigterm_action.sa_handler != SIG_IGN){
2101
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2102
if(ret == -1){
2103
perror_plus("sigaction");
2104
exitcode = EX_OSERR;
2105
goto end;
2106
}
2107
}
2108
2109
/* If no interfaces were specified, make a list */
2110
if(interfaces == NULL){
2111
struct dirent **direntries;
2112
/* Look for any good interfaces */
2113
ret = scandir(sys_class_net, &direntries, good_interface,
2114
alphasort);
2115
if(ret >= 1){
2116
/* Add all found interfaces to interfaces list */
2117
for(int i = 0; i < ret; ++i){
2118
ret_errno = argz_add(&interfaces, &interfaces_size,
2119
direntries[i]->d_name);
2120
if(ret_errno != 0){
2121
perror_plus("argz_add");
2122
continue;
2123
}
2124
if(debug){
2125
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2126
direntries[i]->d_name);
2127
}
2128
}
2129
free(direntries);
2130
} else {
2131
free(direntries);
2132
fprintf_plus(stderr, "Could not find a network interface\n");
833
2133
exitcode = EXIT_FAILURE;
834
2134
goto end;
835
2135
}
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
862
if_index = (AvahiIfIndex) if_nametoindex(interface);
863
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;
912
ret = ioctl(sd, SIOCSIFFLAGS, &network);
913
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
2136
}
2137
2138
/* If we only got one interface, explicitly use only that one */
2139
if(argz_count(interfaces, interfaces_size) == 1){
2140
if(debug){
2141
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2142
interfaces);
2143
}
2144
if_index = (AvahiIfIndex)if_nametoindex(interfaces);
2145
}
2146
2147
/* Bring up interfaces which are down */
2148
if(not (argz_count(interfaces, interfaces_size) == 1
2149
and strcmp(interfaces, "none") == 0)){
2150
char *interface = NULL;
2151
while((interface = argz_next(interfaces, interfaces_size,
2152
interface))){
2153
bool interface_was_up = interface_is_up(interface);
2154
ret = bring_up_interface(interface, delay);
2155
if(not interface_was_up){
2156
if(ret != 0){
2157
errno = ret;
2158
perror_plus("Failed to bring up interface");
2159
} else {
2160
ret_errno = argz_add(&interfaces_to_take_down,
2161
&interfaces_to_take_down_size,
2162
interface);
2163
}
2164
}
2165
}
2166
free(interfaces);
2167
interfaces = NULL;
2168
interfaces_size = 0;
2169
if(debug and (interfaces_to_take_down == NULL)){
2170
fprintf_plus(stderr, "No interfaces were brought up\n");
2171
}
2172
}
2173
2174
if(quit_now){
2175
goto end;
2176
}
2177
2178
ret = init_gnutls_global(pubkey, seckey);
2179
if(ret == -1){
2180
fprintf_plus(stderr, "init_gnutls_global failed\n");
2181
exitcode = EX_UNAVAILABLE;
2182
goto end;
2183
} else {
2184
gnutls_initialized = true;
2185
}
2186
2187
if(quit_now){
2188
goto end;
2189
}
2190
2191
if(mkdtemp(tempdir) == NULL){
2192
perror_plus("mkdtemp");
2193
goto end;
2194
}
2195
tempdir_created = true;
2196
2197
if(quit_now){
2198
goto end;
2199
}
2200
2201
if(not init_gpgme(pubkey, seckey, tempdir)){
2202
fprintf_plus(stderr, "init_gpgme failed\n");
2203
exitcode = EX_UNAVAILABLE;
2204
goto end;
2205
} else {
2206
gpgme_initialized = true;
2207
}
2208
2209
if(quit_now){
2210
goto end;
2211
}
2212
2213
if(connect_to != NULL){
2214
/* Connect directly, do not use Zeroconf */
2215
/* (Mainly meant for debugging) */
2216
char *address = strrchr(connect_to, ':');
2217
2218
if(address == NULL){
2219
fprintf_plus(stderr, "No colon in address\n");
2220
exitcode = EX_USAGE;
2221
goto end;
2222
}
2223
2224
if(quit_now){
2225
goto end;
2226
}
2227
2228
uint16_t port;
2229
errno = 0;
2230
tmpmax = strtoimax(address+1, &tmp, 10);
2231
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2232
or tmpmax != (uint16_t)tmpmax){
2233
fprintf_plus(stderr, "Bad port number\n");
2234
exitcode = EX_USAGE;
2235
goto end;
2236
}
2237
2238
if(quit_now){
2239
goto end;
2240
}
2241
2242
port = (uint16_t)tmpmax;
2243
*address = '\0';
2244
/* Colon in address indicates IPv6 */
2245
int af;
2246
if(strchr(connect_to, ':') != NULL){
2247
af = AF_INET6;
2248
/* Accept [] around IPv6 address - see RFC 5952 */
2249
if(connect_to[0] == '[' and address[-1] == ']')
2250
{
2251
connect_to++;
2252
address[-1] = '\0';
2253
}
2254
} else {
2255
af = AF_INET;
2256
}
2257
address = connect_to;
2258
2259
if(quit_now){
2260
goto end;
2261
}
2262
2263
while(not quit_now){
2264
ret = start_mandos_communication(address, port, if_index, af);
2265
if(quit_now or ret == 0){
2266
break;
2267
}
2268
if(debug){
2269
fprintf_plus(stderr, "Retrying in %d seconds\n",
2270
(int)retry_interval);
2271
}
2272
sleep((int)retry_interval);
2273
}
2274
2275
if (not quit_now){
2276
exitcode = EXIT_SUCCESS;
2277
}
2278
2279
goto end;
2280
}
2281
2282
if(quit_now){
2283
goto end;
2284
}
2285
2286
{
2287
AvahiServerConfig config;
2288
/* Do not publish any local Zeroconf records */
2289
avahi_server_config_init(&config);
2290
config.publish_hinfo = 0;
2291
config.publish_addresses = 0;
2292
config.publish_workstation = 0;
2293
config.publish_domain = 0;
2294
2295
/* Allocate a new server */
2296
mc.server = avahi_server_new(avahi_simple_poll_get
2297
(mc.simple_poll), &config, NULL,
2298
NULL, &ret_errno);
2299
2300
/* Free the Avahi configuration data */
2301
avahi_server_config_free(&config);
2302
}
2303
2304
/* Check if creating the Avahi server object succeeded */
2305
if(mc.server == NULL){
2306
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2307
avahi_strerror(ret_errno));
2308
exitcode = EX_UNAVAILABLE;
2309
goto end;
2310
}
2311
2312
if(quit_now){
2313
goto end;
2314
}
2315
2316
/* Create the Avahi service browser */
2317
sb = avahi_s_service_browser_new(mc.server, if_index,
2318
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2319
NULL, 0, browse_callback, NULL);
2320
if(sb == NULL){
2321
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2322
avahi_strerror(avahi_server_errno(mc.server)));
2323
exitcode = EX_UNAVAILABLE;
2324
goto end;
2325
}
2326
2327
if(quit_now){
2328
goto end;
2329
}
2330
2331
/* Run the main loop */
2332
2333
if(debug){
2334
fprintf_plus(stderr, "Starting Avahi loop search\n");
2335
}
2336
2337
ret = avahi_loop_with_timeout(mc.simple_poll,
2338
(int)(retry_interval * 1000));
2339
if(debug){
2340
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2341
(ret == 0) ? "successfully" : "with error");
2342
}
2343
984
2344
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;
2345
2346
if(debug){
2347
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2348
}
2349
2350
/* Cleanup things */
2351
if(sb != NULL)
2352
avahi_s_service_browser_free(sb);
2353
2354
if(mc.server != NULL)
2355
avahi_server_free(mc.server);
2356
2357
if(mc.simple_poll != NULL)
2358
avahi_simple_poll_free(mc.simple_poll);
2359
2360
if(gnutls_initialized){
2361
gnutls_certificate_free_credentials(mc.cred);
2362
gnutls_global_deinit();
2363
gnutls_dh_params_deinit(mc.dh_params);
2364
}
2365
2366
if(gpgme_initialized){
2367
gpgme_release(mc.ctx);
2368
}
2369
2370
/* Cleans up the circular linked list of Mandos servers the client
2371
has seen */
2372
if(mc.current_server != NULL){
2373
mc.current_server->prev->next = NULL;
2374
while(mc.current_server != NULL){
2375
server *next = mc.current_server->next;
2376
free(mc.current_server);
2377
mc.current_server = next;
2378
}
2379
}
2380
2381
/* Re-raise priviliges */
2382
{
2383
raise_privileges();
2384
2385
/* Run network hooks */
2386
run_network_hooks("stop", interfaces_hooks, delay);
2387
2388
/* Take down the network interfaces which were brought up */
2389
{
2390
char *interface = NULL;
2391
while((interface=argz_next(interfaces_to_take_down,
2392
interfaces_to_take_down_size,
2393
interface))){
2394
ret_errno = take_down_interface(interface);
2395
if(ret_errno != 0){
2396
errno = ret_errno;
2397
perror_plus("Failed to take down interface");
2398
}
2399
}
2400
if(debug and (interfaces_to_take_down == NULL)){
2401
fprintf_plus(stderr, "No interfaces needed to be taken"
2402
" down\n");
2403
}
2404
}
2405
2406
lower_privileges_permanently();
2407
}
2408
2409
free(interfaces_to_take_down);
2410
free(interfaces_hooks);
2411
2412
/* Removes the GPGME temp directory and all files inside */
2413
if(tempdir_created){
2414
struct dirent **direntries = NULL;
2415
struct dirent *direntry = NULL;
2416
int numentries = scandir(tempdir, &direntries, notdotentries,
2417
alphasort);
2418
if (numentries > 0){
2419
for(int i = 0; i < numentries; i++){
2420
direntry = direntries[i];
2421
char *fullname = NULL;
2422
ret = asprintf(&fullname, "%s/%s", tempdir,
2423
direntry->d_name);
2424
if(ret < 0){
2425
perror_plus("asprintf");
2426
continue;
2427
}
2428
ret = remove(fullname);
2429
if(ret == -1){
2430
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2431
strerror(errno));
2432
}
2433
free(fullname);
2434
}
2435
}
2436
2437
/* need to clean even if 0 because man page doesn't specify */
2438
free(direntries);
2439
if (numentries == -1){
2440
perror_plus("scandir");
2441
}
2442
ret = rmdir(tempdir);
2443
if(ret == -1 and errno != ENOENT){
2444
perror_plus("rmdir");
2445
}
2446
}
2447
2448
if(quit_now){
2449
sigemptyset(&old_sigterm_action.sa_mask);
2450
old_sigterm_action.sa_handler = SIG_DFL;
2451
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2452
&old_sigterm_action,
2453
NULL));
2454
if(ret == -1){
2455
perror_plus("sigaction");
2456
}
2457
do {
2458
ret = raise(signal_received);
2459
} while(ret != 0 and errno == EINTR);
2460
if(ret != 0){
2461
perror_plus("raise");
2462
abort();
2463
}
2464
TEMP_FAILURE_RETRY(pause());
2465
}
2466
2467
return exitcode;
1003
2468
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0