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- Committer: Teddy Hogeborn
- Date: 2014-03-10 06:34:36 UTC
- Revision ID: teddy@recompile.se-20140310063436-zksdghqvv6k1pbyg
Do not add a new server to server list if clock_gettime() fails
* plugins.d/mandos-client.c (add_server): Set server.last_seen before
adding new server, in case
clock_gettime() fails.
* plugins.d/mandos-client.c (add_server): Set server.last_seen before
adding new server, in case
clock_gettime() fails.
- files added:
- DBUS-API
- debian/source
- network-hooks.d
- files removed:
- debian/mandos-client.config
- files modified:
- .bzrignore
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 © 2008 Teddy Hogeborn & Björn Påhlsson
12
* Copyright © 2008-2013 Teddy Hogeborn
13
* Copyright © 2008-2013 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
38
#endif
34
39
35
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
36
41
37
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
38
stdout, ferror() */
39
#include <stdint.h> /* uint16_t, uint32_t */
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
40
45
#include <stddef.h> /* NULL, size_t, ssize_t */
41
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
42
srand() */
43
#include <stdbool.h> /* bool, true */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
#include <stdbool.h> /* bool, false, true */
44
49
#include <string.h> /* memset(), strcmp(), strlen(),
45
50
strerror(), asprintf(), strcpy() */
46
#include <sys/ioctl.h> /* ioctl */
51
#include <sys/ioctl.h> /* ioctl */
47
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
48
53
sockaddr_in6, PF_INET6,
49
SOCK_STREAM, INET6_ADDRSTRLEN,
50
uid_t, gid_t, open(), opendir(), DIR */
51
#include <sys/stat.h> /* open() */
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
52
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
53
struct in6_addr, inet_pton(),
54
connect() */
58
inet_pton(), connect(),
59
getnameinfo() */
55
60
#include <fcntl.h> /* open() */
56
#include <dirent.h> /* opendir(), struct dirent, readdir() */
57
#include <inttypes.h> /* PRIu16 */
58
#include <assert.h> /* assert() */
59
#include <errno.h> /* perror(), errno */
60
#include <time.h> /* time() */
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
*/
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
strtoimax() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
61
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
62
69
SIOCSIFFLAGS, if_indextoname(),
63
70
if_nametoindex(), IF_NAMESIZE */
64
#include <netinet/in.h>
71
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
*/
65
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
66
getuid(), getgid(), setuid(),
67
setgid() */
68
#include <arpa/inet.h> /* inet_pton(), htons */
69
#include <iso646.h> /* not, and */
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons() */
78
#include <iso646.h> /* not, or, and */
70
79
#include <argp.h> /* struct argp_option, error_t, struct
71
80
argp_state, struct argp,
72
81
argp_parse(), ARGP_KEY_ARG,
73
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
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
96
EAI_SYSTEM, gai_strerror() */
97
98
#ifdef __linux__
99
#include <sys/klog.h> /* klogctl() */
100
#endif /* __linux__ */
74
101
75
102
/* Avahi */
76
103
/* All Avahi types, constants and functions
89
116
gnutls_*
90
117
init_gnutls_session(),
91
118
GNUTLS_* */
92
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
93
GNUTLS_OPENPGP_FMT_BASE64 */
119
#include <gnutls/openpgp.h>
120
/* gnutls_certificate_set_openpgp_key_file(),
121
GNUTLS_OPENPGP_FMT_BASE64 */
94
122
95
123
/* GPGME */
96
124
#include <gpgme.h> /* All GPGME types, constants and
104
132
#define PATHDIR "/conf/conf.d/mandos"
105
133
#define SECKEY "seckey.txt"
106
134
#define PUBKEY "pubkey.txt"
135
#define HOOKDIR "/lib/mandos/network-hooks.d"
107
136
108
137
bool debug = false;
109
138
static const char mandos_protocol_version[] = "1";
110
139
const char *argp_program_version = "mandos-client " VERSION;
111
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
140
const char *argp_program_bug_address = "<mandos@recompile.se>";
141
static const char sys_class_net[] = "/sys/class/net";
142
char *connect_to = NULL;
143
const char *hookdir = HOOKDIR;
144
uid_t uid = 65534;
145
gid_t gid = 65534;
146
147
/* Doubly linked list that need to be circularly linked when used */
148
typedef struct server{
149
const char *ip;
150
in_port_t port;
151
AvahiIfIndex if_index;
152
int af;
153
struct timespec last_seen;
154
struct server *next;
155
struct server *prev;
156
} server;
112
157
113
158
/* Used for passing in values through the Avahi callback functions */
114
159
typedef struct {
115
AvahiSimplePoll *simple_poll;
116
160
AvahiServer *server;
117
161
gnutls_certificate_credentials_t cred;
118
162
unsigned int dh_bits;
119
163
gnutls_dh_params_t dh_params;
120
164
const char *priority;
121
165
gpgme_ctx_t ctx;
166
server *current_server;
167
char *interfaces;
168
size_t interfaces_size;
122
169
} mandos_context;
123
170
171
/* global so signal handler can reach it*/
172
AvahiSimplePoll *simple_poll;
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 (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
194
}
195
124
196
/*
125
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
126
* "buffer_capacity" is how much is currently allocated,
197
* Make additional room in "buffer" for at least BUFFER_SIZE more
198
* bytes. "buffer_capacity" is how much is currently allocated,
127
199
* "buffer_length" is how much is already used.
128
200
*/
129
size_t adjustbuffer(char **buffer, size_t buffer_length,
130
size_t buffer_capacity){
131
if (buffer_length + BUFFER_SIZE > buffer_capacity){
132
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
133
if (buffer == NULL){
201
size_t incbuffer(char **buffer, size_t buffer_length,
202
size_t buffer_capacity){
203
if(buffer_length + BUFFER_SIZE > buffer_capacity){
204
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
205
if(new_buf == NULL){
206
int old_errno = errno;
207
free(*buffer);
208
errno = old_errno;
209
*buffer = NULL;
134
210
return 0;
135
211
}
212
*buffer = new_buf;
136
213
buffer_capacity += BUFFER_SIZE;
137
214
}
138
215
return buffer_capacity;
139
216
}
140
217
218
/* Add server to set of servers to retry periodically */
219
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
220
int af, server **current_server){
221
int ret;
222
server *new_server = malloc(sizeof(server));
223
if(new_server == NULL){
224
perror_plus("malloc");
225
return false;
226
}
227
*new_server = (server){ .ip = strdup(ip),
228
.port = port,
229
.if_index = if_index,
230
.af = af };
231
if(new_server->ip == NULL){
232
perror_plus("strdup");
233
return false;
234
}
235
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
236
if(ret == -1){
237
perror_plus("clock_gettime");
238
return false;
239
}
240
/* Special case of first server */
241
if(*current_server == NULL){
242
new_server->next = new_server;
243
new_server->prev = new_server;
244
*current_server = new_server;
245
/* Place the new server last in the list */
246
} else {
247
new_server->next = *current_server;
248
new_server->prev = (*current_server)->prev;
249
new_server->prev->next = new_server;
250
(*current_server)->prev = new_server;
251
}
252
return true;
253
}
254
141
255
/*
142
256
* Initialize GPGME.
143
257
*/
144
static bool init_gpgme(mandos_context *mc, const char *seckey,
145
const char *pubkey, const char *tempdir){
146
int ret;
258
static bool init_gpgme(const char *seckey, const char *pubkey,
259
const char *tempdir, mandos_context *mc){
147
260
gpgme_error_t rc;
148
261
gpgme_engine_info_t engine_info;
149
262
150
151
263
/*
152
* Helper function to insert pub and seckey to the enigne keyring.
264
* Helper function to insert pub and seckey to the engine keyring.
153
265
*/
154
266
bool import_key(const char *filename){
267
int ret;
155
268
int fd;
156
269
gpgme_data_t pgp_data;
157
270
158
fd = TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
271
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
159
272
if(fd == -1){
160
perror("open");
273
perror_plus("open");
161
274
return false;
162
275
}
163
276
164
277
rc = gpgme_data_new_from_fd(&pgp_data, fd);
165
if (rc != GPG_ERR_NO_ERROR){
166
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
167
gpgme_strsource(rc), gpgme_strerror(rc));
278
if(rc != GPG_ERR_NO_ERROR){
279
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
280
gpgme_strsource(rc), gpgme_strerror(rc));
168
281
return false;
169
282
}
170
283
171
284
rc = gpgme_op_import(mc->ctx, pgp_data);
172
if (rc != GPG_ERR_NO_ERROR){
173
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
174
gpgme_strsource(rc), gpgme_strerror(rc));
285
if(rc != GPG_ERR_NO_ERROR){
286
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
287
gpgme_strsource(rc), gpgme_strerror(rc));
175
288
return false;
176
289
}
177
290
178
ret = TEMP_FAILURE_RETRY(close(fd));
291
ret = (int)TEMP_FAILURE_RETRY(close(fd));
179
292
if(ret == -1){
180
perror("close");
293
perror_plus("close");
181
294
}
182
295
gpgme_data_release(pgp_data);
183
296
return true;
184
297
}
185
298
186
if (debug){
187
fprintf(stderr, "Initialize gpgme\n");
299
if(debug){
300
fprintf_plus(stderr, "Initializing GPGME\n");
188
301
}
189
302
190
303
/* Init GPGME */
191
304
gpgme_check_version(NULL);
192
305
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
193
if (rc != GPG_ERR_NO_ERROR){
194
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
306
if(rc != GPG_ERR_NO_ERROR){
307
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
308
gpgme_strsource(rc), gpgme_strerror(rc));
196
309
return false;
197
310
}
198
311
199
/* Set GPGME home directory for the OpenPGP engine only */
200
rc = gpgme_get_engine_info (&engine_info);
201
if (rc != GPG_ERR_NO_ERROR){
202
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
203
gpgme_strsource(rc), gpgme_strerror(rc));
312
/* Set GPGME home directory for the OpenPGP engine only */
313
rc = gpgme_get_engine_info(&engine_info);
314
if(rc != GPG_ERR_NO_ERROR){
315
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
316
gpgme_strsource(rc), gpgme_strerror(rc));
204
317
return false;
205
318
}
206
319
while(engine_info != NULL){
212
325
engine_info = engine_info->next;
213
326
}
214
327
if(engine_info == NULL){
215
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
328
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
329
tempdir);
216
330
return false;
217
331
}
218
332
219
333
/* Create new GPGME "context" */
220
334
rc = gpgme_new(&(mc->ctx));
221
if (rc != GPG_ERR_NO_ERROR){
222
fprintf(stderr, "bad gpgme_new: %s: %s\n",
223
gpgme_strsource(rc), gpgme_strerror(rc));
224
return false;
225
}
226
227
if (not import_key(pubkey) or not import_key(seckey)){
228
return false;
229
}
230
231
return true;
335
if(rc != GPG_ERR_NO_ERROR){
336
fprintf_plus(stderr, "Mandos plugin mandos-client: "
337
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
338
gpgme_strerror(rc));
339
return false;
340
}
341
342
if(not import_key(pubkey) or not import_key(seckey)){
343
return false;
344
}
345
346
return true;
232
347
}
233
348
234
349
/*
235
350
* Decrypt OpenPGP data.
236
351
* Returns -1 on error
237
352
*/
238
static ssize_t pgp_packet_decrypt (const mandos_context *mc,
239
const char *cryptotext,
240
size_t crypto_size,
241
char **plaintext){
353
static ssize_t pgp_packet_decrypt(const char *cryptotext,
354
size_t crypto_size,
355
char **plaintext,
356
mandos_context *mc){
242
357
gpgme_data_t dh_crypto, dh_plain;
243
358
gpgme_error_t rc;
244
359
ssize_t ret;
245
360
size_t plaintext_capacity = 0;
246
361
ssize_t plaintext_length = 0;
247
362
248
if (debug){
249
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
363
if(debug){
364
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
250
365
}
251
366
252
367
/* Create new GPGME data buffer from memory cryptotext */
253
368
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
254
369
0);
255
if (rc != GPG_ERR_NO_ERROR){
256
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
257
gpgme_strsource(rc), gpgme_strerror(rc));
370
if(rc != GPG_ERR_NO_ERROR){
371
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
372
gpgme_strsource(rc), gpgme_strerror(rc));
258
373
return -1;
259
374
}
260
375
261
376
/* Create new empty GPGME data buffer for the plaintext */
262
377
rc = gpgme_data_new(&dh_plain);
263
if (rc != GPG_ERR_NO_ERROR){
264
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
265
gpgme_strsource(rc), gpgme_strerror(rc));
378
if(rc != GPG_ERR_NO_ERROR){
379
fprintf_plus(stderr, "Mandos plugin mandos-client: "
380
"bad gpgme_data_new: %s: %s\n",
381
gpgme_strsource(rc), gpgme_strerror(rc));
266
382
gpgme_data_release(dh_crypto);
267
383
return -1;
268
384
}
270
386
/* Decrypt data from the cryptotext data buffer to the plaintext
271
387
data buffer */
272
388
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
273
if (rc != GPG_ERR_NO_ERROR){
274
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
275
gpgme_strsource(rc), gpgme_strerror(rc));
389
if(rc != GPG_ERR_NO_ERROR){
390
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
391
gpgme_strsource(rc), gpgme_strerror(rc));
276
392
plaintext_length = -1;
277
if (debug){
393
if(debug){
278
394
gpgme_decrypt_result_t result;
279
395
result = gpgme_op_decrypt_result(mc->ctx);
280
if (result == NULL){
281
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
396
if(result == NULL){
397
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
282
398
} else {
283
fprintf(stderr, "Unsupported algorithm: %s\n",
284
result->unsupported_algorithm);
285
fprintf(stderr, "Wrong key usage: %u\n",
286
result->wrong_key_usage);
399
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
400
result->unsupported_algorithm);
401
fprintf_plus(stderr, "Wrong key usage: %u\n",
402
result->wrong_key_usage);
287
403
if(result->file_name != NULL){
288
fprintf(stderr, "File name: %s\n", result->file_name);
404
fprintf_plus(stderr, "File name: %s\n", result->file_name);
289
405
}
290
406
gpgme_recipient_t recipient;
291
407
recipient = result->recipients;
292
if(recipient){
293
while(recipient != NULL){
294
fprintf(stderr, "Public key algorithm: %s\n",
295
gpgme_pubkey_algo_name(recipient->pubkey_algo));
296
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
297
fprintf(stderr, "Secret key available: %s\n",
298
recipient->status == GPG_ERR_NO_SECKEY
299
? "No" : "Yes");
300
recipient = recipient->next;
301
}
408
while(recipient != NULL){
409
fprintf_plus(stderr, "Public key algorithm: %s\n",
410
gpgme_pubkey_algo_name
411
(recipient->pubkey_algo));
412
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
413
fprintf_plus(stderr, "Secret key available: %s\n",
414
recipient->status == GPG_ERR_NO_SECKEY
415
? "No" : "Yes");
416
recipient = recipient->next;
302
417
}
303
418
}
304
419
}
306
421
}
307
422
308
423
if(debug){
309
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
424
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
310
425
}
311
426
312
427
/* Seek back to the beginning of the GPGME plaintext data buffer */
313
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
314
perror("gpgme_data_seek");
428
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
429
perror_plus("gpgme_data_seek");
315
430
plaintext_length = -1;
316
431
goto decrypt_end;
317
432
}
318
433
319
434
*plaintext = NULL;
320
435
while(true){
321
plaintext_capacity = adjustbuffer(plaintext,
322
(size_t)plaintext_length,
323
plaintext_capacity);
324
if (plaintext_capacity == 0){
325
perror("adjustbuffer");
326
plaintext_length = -1;
327
goto decrypt_end;
436
plaintext_capacity = incbuffer(plaintext,
437
(size_t)plaintext_length,
438
plaintext_capacity);
439
if(plaintext_capacity == 0){
440
perror_plus("incbuffer");
441
plaintext_length = -1;
442
goto decrypt_end;
328
443
}
329
444
330
445
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
331
446
BUFFER_SIZE);
332
447
/* Print the data, if any */
333
if (ret == 0){
448
if(ret == 0){
334
449
/* EOF */
335
450
break;
336
451
}
337
452
if(ret < 0){
338
perror("gpgme_data_read");
453
perror_plus("gpgme_data_read");
339
454
plaintext_length = -1;
340
455
goto decrypt_end;
341
456
}
343
458
}
344
459
345
460
if(debug){
346
fprintf(stderr, "Decrypted password is: ");
461
fprintf_plus(stderr, "Decrypted password is: ");
347
462
for(ssize_t i = 0; i < plaintext_length; i++){
348
463
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
349
464
}
360
475
return plaintext_length;
361
476
}
362
477
363
static const char * safer_gnutls_strerror (int value) {
364
const char *ret = gnutls_strerror (value); /* Spurious warning */
365
if (ret == NULL)
478
static const char * safer_gnutls_strerror(int value){
479
const char *ret = gnutls_strerror(value);
480
if(ret == NULL)
366
481
ret = "(unknown)";
367
482
return ret;
368
483
}
370
485
/* GnuTLS log function callback */
371
486
static void debuggnutls(__attribute__((unused)) int level,
372
487
const char* string){
373
fprintf(stderr, "GnuTLS: %s", string);
488
fprintf_plus(stderr, "GnuTLS: %s", string);
374
489
}
375
490
376
static int init_gnutls_global(mandos_context *mc,
377
const char *pubkeyfilename,
378
const char *seckeyfilename){
491
static int init_gnutls_global(const char *pubkeyfilename,
492
const char *seckeyfilename,
493
mandos_context *mc){
379
494
int ret;
380
495
381
496
if(debug){
382
fprintf(stderr, "Initializing GnuTLS\n");
497
fprintf_plus(stderr, "Initializing GnuTLS\n");
383
498
}
384
499
385
500
ret = gnutls_global_init();
386
if (ret != GNUTLS_E_SUCCESS) {
387
fprintf (stderr, "GnuTLS global_init: %s\n",
388
safer_gnutls_strerror(ret));
501
if(ret != GNUTLS_E_SUCCESS){
502
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
503
safer_gnutls_strerror(ret));
389
504
return -1;
390
505
}
391
506
392
if (debug){
507
if(debug){
393
508
/* "Use a log level over 10 to enable all debugging options."
394
509
* - GnuTLS manual
395
510
*/
398
513
}
399
514
400
515
/* OpenPGP credentials */
401
gnutls_certificate_allocate_credentials(&mc->cred);
402
if (ret != GNUTLS_E_SUCCESS){
403
fprintf (stderr, "GnuTLS memory error: %s\n", /* Spurious
404
warning */
405
safer_gnutls_strerror(ret));
406
gnutls_global_deinit ();
516
ret = gnutls_certificate_allocate_credentials(&mc->cred);
517
if(ret != GNUTLS_E_SUCCESS){
518
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
519
safer_gnutls_strerror(ret));
520
gnutls_global_deinit();
407
521
return -1;
408
522
}
409
523
410
524
if(debug){
411
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
412
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
413
seckeyfilename);
525
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
526
" secret key %s as GnuTLS credentials\n",
527
pubkeyfilename,
528
seckeyfilename);
414
529
}
415
530
416
531
ret = gnutls_certificate_set_openpgp_key_file
417
532
(mc->cred, pubkeyfilename, seckeyfilename,
418
533
GNUTLS_OPENPGP_FMT_BASE64);
419
if (ret != GNUTLS_E_SUCCESS) {
420
fprintf(stderr,
421
"Error[%d] while reading the OpenPGP key pair ('%s',"
422
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
423
fprintf(stderr, "The GnuTLS error is: %s\n",
424
safer_gnutls_strerror(ret));
534
if(ret != GNUTLS_E_SUCCESS){
535
fprintf_plus(stderr,
536
"Error[%d] while reading the OpenPGP key pair ('%s',"
537
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
538
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
539
safer_gnutls_strerror(ret));
425
540
goto globalfail;
426
541
}
427
542
428
543
/* GnuTLS server initialization */
429
544
ret = gnutls_dh_params_init(&mc->dh_params);
430
if (ret != GNUTLS_E_SUCCESS) {
431
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
432
" %s\n", safer_gnutls_strerror(ret));
545
if(ret != GNUTLS_E_SUCCESS){
546
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
547
" initialization: %s\n",
548
safer_gnutls_strerror(ret));
433
549
goto globalfail;
434
550
}
435
551
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
436
if (ret != GNUTLS_E_SUCCESS) {
437
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
438
safer_gnutls_strerror(ret));
552
if(ret != GNUTLS_E_SUCCESS){
553
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
554
safer_gnutls_strerror(ret));
439
555
goto globalfail;
440
556
}
441
557
451
567
return -1;
452
568
}
453
569
454
static int init_gnutls_session(mandos_context *mc,
455
gnutls_session_t *session){
570
static int init_gnutls_session(gnutls_session_t *session,
571
mandos_context *mc){
456
572
int ret;
457
573
/* GnuTLS session creation */
458
ret = gnutls_init(session, GNUTLS_SERVER);
459
if (ret != GNUTLS_E_SUCCESS){
460
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
461
safer_gnutls_strerror(ret));
574
do {
575
ret = gnutls_init(session, GNUTLS_SERVER);
576
if(quit_now){
577
return -1;
578
}
579
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
580
if(ret != GNUTLS_E_SUCCESS){
581
fprintf_plus(stderr,
582
"Error in GnuTLS session initialization: %s\n",
583
safer_gnutls_strerror(ret));
462
584
}
463
585
464
586
{
465
587
const char *err;
466
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
467
if (ret != GNUTLS_E_SUCCESS) {
468
fprintf(stderr, "Syntax error at: %s\n", err);
469
fprintf(stderr, "GnuTLS error: %s\n",
470
safer_gnutls_strerror(ret));
471
gnutls_deinit (*session);
588
do {
589
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
590
if(quit_now){
591
gnutls_deinit(*session);
592
return -1;
593
}
594
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
595
if(ret != GNUTLS_E_SUCCESS){
596
fprintf_plus(stderr, "Syntax error at: %s\n", err);
597
fprintf_plus(stderr, "GnuTLS error: %s\n",
598
safer_gnutls_strerror(ret));
599
gnutls_deinit(*session);
472
600
return -1;
473
601
}
474
602
}
475
603
476
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
477
mc->cred);
478
if (ret != GNUTLS_E_SUCCESS) {
479
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
480
safer_gnutls_strerror(ret));
481
gnutls_deinit (*session);
604
do {
605
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
606
mc->cred);
607
if(quit_now){
608
gnutls_deinit(*session);
609
return -1;
610
}
611
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
612
if(ret != GNUTLS_E_SUCCESS){
613
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
614
safer_gnutls_strerror(ret));
615
gnutls_deinit(*session);
482
616
return -1;
483
617
}
484
618
485
619
/* ignore client certificate if any. */
486
gnutls_certificate_server_set_request (*session,
487
GNUTLS_CERT_IGNORE);
620
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
488
621
489
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
622
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
490
623
491
624
return 0;
492
625
}
496
629
__attribute__((unused)) const char *txt){}
497
630
498
631
/* Called when a Mandos server is found */
499
static int start_mandos_communication(const char *ip, uint16_t port,
632
static int start_mandos_communication(const char *ip, in_port_t port,
500
633
AvahiIfIndex if_index,
501
mandos_context *mc){
502
int ret, tcp_sd;
503
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
634
int af, mandos_context *mc){
635
int ret, tcp_sd = -1;
636
ssize_t sret;
637
union {
638
struct sockaddr_in in;
639
struct sockaddr_in6 in6;
640
} to;
504
641
char *buffer = NULL;
505
char *decrypted_buffer;
642
char *decrypted_buffer = NULL;
506
643
size_t buffer_length = 0;
507
644
size_t buffer_capacity = 0;
508
ssize_t decrypted_buffer_size;
509
645
size_t written;
510
int retval = 0;
511
char interface[IF_NAMESIZE];
646
int retval = -1;
512
647
gnutls_session_t session;
513
514
ret = init_gnutls_session (mc, &session);
515
if (ret != 0){
516
return -1;
517
}
518
519
if(debug){
520
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
521
"\n", ip, port);
522
}
523
524
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
525
if(tcp_sd < 0) {
526
perror("socket");
527
return -1;
528
}
529
530
if(debug){
531
if(if_indextoname((unsigned int)if_index, interface) == NULL){
532
perror("if_indextoname");
648
int pf; /* Protocol family */
649
650
errno = 0;
651
652
if(quit_now){
653
errno = EINTR;
654
return -1;
655
}
656
657
switch(af){
658
case AF_INET6:
659
pf = PF_INET6;
660
break;
661
case AF_INET:
662
pf = PF_INET;
663
break;
664
default:
665
fprintf_plus(stderr, "Bad address family: %d\n", af);
666
errno = EINVAL;
667
return -1;
668
}
669
670
/* If the interface is specified and we have a list of interfaces */
671
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
672
/* Check if the interface is one of the interfaces we are using */
673
bool match = false;
674
{
675
char *interface = NULL;
676
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
677
interface))){
678
if(if_nametoindex(interface) == (unsigned int)if_index){
679
match = true;
680
break;
681
}
682
}
683
}
684
if(not match){
685
/* This interface does not match any in the list, so we don't
686
connect to the server */
687
if(debug){
688
char interface[IF_NAMESIZE];
689
if(if_indextoname((unsigned int)if_index, interface) == NULL){
690
perror_plus("if_indextoname");
691
} else {
692
fprintf_plus(stderr, "Skipping server on non-used interface"
693
" \"%s\"\n",
694
if_indextoname((unsigned int)if_index,
695
interface));
696
}
697
}
533
698
return -1;
534
699
}
535
fprintf(stderr, "Binding to interface %s\n", interface);
700
}
701
702
ret = init_gnutls_session(&session, mc);
703
if(ret != 0){
704
return -1;
705
}
706
707
if(debug){
708
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
709
PRIuMAX "\n", ip, (uintmax_t)port);
710
}
711
712
tcp_sd = socket(pf, SOCK_STREAM, 0);
713
if(tcp_sd < 0){
714
int e = errno;
715
perror_plus("socket");
716
errno = e;
717
goto mandos_end;
718
}
719
720
if(quit_now){
721
errno = EINTR;
722
goto mandos_end;
536
723
}
537
724
538
725
memset(&to, 0, sizeof(to));
539
to.in6.sin6_family = AF_INET6;
540
/* It would be nice to have a way to detect if we were passed an
541
IPv4 address here. Now we assume an IPv6 address. */
542
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
543
if (ret < 0 ){
544
perror("inet_pton");
545
return -1;
726
if(af == AF_INET6){
727
to.in6.sin6_family = (sa_family_t)af;
728
ret = inet_pton(af, ip, &to.in6.sin6_addr);
729
} else { /* IPv4 */
730
to.in.sin_family = (sa_family_t)af;
731
ret = inet_pton(af, ip, &to.in.sin_addr);
732
}
733
if(ret < 0 ){
734
int e = errno;
735
perror_plus("inet_pton");
736
errno = e;
737
goto mandos_end;
546
738
}
547
739
if(ret == 0){
548
fprintf(stderr, "Bad address: %s\n", ip);
549
return -1;
550
}
551
to.in6.sin6_port = htons(port); /* Spurious warning */
740
int e = errno;
741
fprintf_plus(stderr, "Bad address: %s\n", ip);
742
errno = e;
743
goto mandos_end;
744
}
745
if(af == AF_INET6){
746
to.in6.sin6_port = htons(port);
747
#ifdef __GNUC__
748
#pragma GCC diagnostic push
749
#pragma GCC diagnostic ignored "-Wstrict-aliasing"
750
#endif
751
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
752
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower */
753
#ifdef __GNUC__
754
#pragma GCC diagnostic pop
755
#endif
756
if(if_index == AVAHI_IF_UNSPEC){
757
fprintf_plus(stderr, "An IPv6 link-local address is"
758
" incomplete without a network interface\n");
759
errno = EINVAL;
760
goto mandos_end;
761
}
762
/* Set the network interface number as scope */
763
to.in6.sin6_scope_id = (uint32_t)if_index;
764
}
765
} else {
766
to.in.sin_port = htons(port);
767
}
552
768
553
to.in6.sin6_scope_id = (uint32_t)if_index;
769
if(quit_now){
770
errno = EINTR;
771
goto mandos_end;
772
}
554
773
555
774
if(debug){
556
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
557
port);
558
char addrstr[INET6_ADDRSTRLEN] = "";
559
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
560
sizeof(addrstr)) == NULL){
561
perror("inet_ntop");
562
} else {
563
if(strcmp(addrstr, ip) != 0){
564
fprintf(stderr, "Canonical address form: %s\n", addrstr);
775
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
776
char interface[IF_NAMESIZE];
777
if(if_indextoname((unsigned int)if_index, interface) == NULL){
778
perror_plus("if_indextoname");
779
} else {
780
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
781
"\n", ip, interface, (uintmax_t)port);
565
782
}
566
}
567
}
568
569
ret = connect(tcp_sd, &to.in, sizeof(to));
570
if (ret < 0){
571
perror("connect");
572
return -1;
783
} else {
784
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
785
ip, (uintmax_t)port);
786
}
787
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
788
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
789
if(af == AF_INET6){
790
ret = getnameinfo((struct sockaddr *)&(to.in6), sizeof(to.in6),
791
addrstr, sizeof(addrstr), NULL, 0,
792
NI_NUMERICHOST);
793
} else {
794
ret = getnameinfo((struct sockaddr *)&(to.in), sizeof(to.in),
795
addrstr, sizeof(addrstr), NULL, 0,
796
NI_NUMERICHOST);
797
}
798
if(ret == EAI_SYSTEM){
799
perror_plus("getnameinfo");
800
} else if(ret != 0) {
801
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
802
} else if(strcmp(addrstr, ip) != 0){
803
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
804
}
805
}
806
807
if(quit_now){
808
errno = EINTR;
809
goto mandos_end;
810
}
811
812
if(af == AF_INET6){
813
ret = connect(tcp_sd, &to.in6, sizeof(to));
814
} else {
815
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
816
}
817
if(ret < 0){
818
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
819
int e = errno;
820
perror_plus("connect");
821
errno = e;
822
}
823
goto mandos_end;
824
}
825
826
if(quit_now){
827
errno = EINTR;
828
goto mandos_end;
573
829
}
574
830
575
831
const char *out = mandos_protocol_version;
576
832
written = 0;
577
while (true){
833
while(true){
578
834
size_t out_size = strlen(out);
579
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
580
out_size - written));
581
if (ret == -1){
582
perror("write");
583
retval = -1;
835
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
836
out_size - written));
837
if(ret == -1){
838
int e = errno;
839
perror_plus("write");
840
errno = e;
584
841
goto mandos_end;
585
842
}
586
843
written += (size_t)ret;
587
844
if(written < out_size){
588
845
continue;
589
846
} else {
590
if (out == mandos_protocol_version){
847
if(out == mandos_protocol_version){
591
848
written = 0;
592
849
out = "\r\n";
593
850
} else {
594
851
break;
595
852
}
596
853
}
854
855
if(quit_now){
856
errno = EINTR;
857
goto mandos_end;
858
}
597
859
}
598
860
599
861
if(debug){
600
fprintf(stderr, "Establishing TLS session with %s\n", ip);
601
}
602
603
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
604
605
do{
606
ret = gnutls_handshake (session);
862
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
863
}
864
865
if(quit_now){
866
errno = EINTR;
867
goto mandos_end;
868
}
869
870
/* This casting via intptr_t is to eliminate warning about casting
871
an int to a pointer type. This is exactly how the GnuTLS Guile
872
function "set-session-transport-fd!" does it. */
873
gnutls_transport_set_ptr(session,
874
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
875
876
if(quit_now){
877
errno = EINTR;
878
goto mandos_end;
879
}
880
881
do {
882
ret = gnutls_handshake(session);
883
if(quit_now){
884
errno = EINTR;
885
goto mandos_end;
886
}
607
887
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
608
888
609
if (ret != GNUTLS_E_SUCCESS){
889
if(ret != GNUTLS_E_SUCCESS){
610
890
if(debug){
611
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
612
gnutls_perror (ret);
891
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
892
gnutls_perror(ret);
613
893
}
614
retval = -1;
894
errno = EPROTO;
615
895
goto mandos_end;
616
896
}
617
897
618
898
/* Read OpenPGP packet that contains the wanted password */
619
899
620
900
if(debug){
621
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
622
ip);
901
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
902
" %s\n", ip);
623
903
}
624
904
625
905
while(true){
626
buffer_capacity = adjustbuffer(&buffer, buffer_length,
627
buffer_capacity);
628
if (buffer_capacity == 0){
629
perror("adjustbuffer");
630
retval = -1;
631
goto mandos_end;
632
}
633
634
ret = gnutls_record_recv(session, buffer+buffer_length,
635
BUFFER_SIZE);
636
if (ret == 0){
906
907
if(quit_now){
908
errno = EINTR;
909
goto mandos_end;
910
}
911
912
buffer_capacity = incbuffer(&buffer, buffer_length,
913
buffer_capacity);
914
if(buffer_capacity == 0){
915
int e = errno;
916
perror_plus("incbuffer");
917
errno = e;
918
goto mandos_end;
919
}
920
921
if(quit_now){
922
errno = EINTR;
923
goto mandos_end;
924
}
925
926
sret = gnutls_record_recv(session, buffer+buffer_length,
927
BUFFER_SIZE);
928
if(sret == 0){
637
929
break;
638
930
}
639
if (ret < 0){
640
switch(ret){
931
if(sret < 0){
932
switch(sret){
641
933
case GNUTLS_E_INTERRUPTED:
642
934
case GNUTLS_E_AGAIN:
643
935
break;
644
936
case GNUTLS_E_REHANDSHAKE:
645
do{
646
ret = gnutls_handshake (session);
937
do {
938
ret = gnutls_handshake(session);
939
940
if(quit_now){
941
errno = EINTR;
942
goto mandos_end;
943
}
647
944
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
648
if (ret < 0){
649
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
650
gnutls_perror (ret);
651
retval = -1;
945
if(ret < 0){
946
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
947
"***\n");
948
gnutls_perror(ret);
949
errno = EPROTO;
652
950
goto mandos_end;
653
951
}
654
952
break;
655
953
default:
656
fprintf(stderr, "Unknown error while reading data from"
657
" encrypted session with Mandos server\n");
658
retval = -1;
659
gnutls_bye (session, GNUTLS_SHUT_RDWR);
954
fprintf_plus(stderr, "Unknown error while reading data from"
955
" encrypted session with Mandos server\n");
956
gnutls_bye(session, GNUTLS_SHUT_RDWR);
957
errno = EIO;
660
958
goto mandos_end;
661
959
}
662
960
} else {
663
buffer_length += (size_t) ret;
961
buffer_length += (size_t) sret;
664
962
}
665
963
}
666
964
667
965
if(debug){
668
fprintf(stderr, "Closing TLS session\n");
669
}
670
671
gnutls_bye (session, GNUTLS_SHUT_RDWR);
672
673
if (buffer_length > 0){
674
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
675
buffer_length,
676
&decrypted_buffer);
677
if (decrypted_buffer_size >= 0){
966
fprintf_plus(stderr, "Closing TLS session\n");
967
}
968
969
if(quit_now){
970
errno = EINTR;
971
goto mandos_end;
972
}
973
974
do {
975
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
976
if(quit_now){
977
errno = EINTR;
978
goto mandos_end;
979
}
980
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
981
982
if(buffer_length > 0){
983
ssize_t decrypted_buffer_size;
984
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
985
&decrypted_buffer, mc);
986
if(decrypted_buffer_size >= 0){
987
678
988
written = 0;
679
989
while(written < (size_t) decrypted_buffer_size){
680
ret = (int)fwrite (decrypted_buffer + written, 1,
681
(size_t)decrypted_buffer_size - written,
682
stdout);
990
if(quit_now){
991
errno = EINTR;
992
goto mandos_end;
993
}
994
995
ret = (int)fwrite(decrypted_buffer + written, 1,
996
(size_t)decrypted_buffer_size - written,
997
stdout);
683
998
if(ret == 0 and ferror(stdout)){
999
int e = errno;
684
1000
if(debug){
685
fprintf(stderr, "Error writing encrypted data: %s\n",
686
strerror(errno));
1001
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1002
strerror(errno));
687
1003
}
688
retval = -1;
689
break;
1004
errno = e;
1005
goto mandos_end;
690
1006
}
691
1007
written += (size_t)ret;
692
1008
}
693
free(decrypted_buffer);
694
} else {
695
retval = -1;
1009
retval = 0;
696
1010
}
697
} else {
698
retval = -1;
699
1011
}
700
1012
701
1013
/* Shutdown procedure */
702
1014
703
1015
mandos_end:
704
free(buffer);
705
ret = TEMP_FAILURE_RETRY(close(tcp_sd));
706
if(ret == -1){
707
perror("close");
1016
{
1017
int e = errno;
1018
free(decrypted_buffer);
1019
free(buffer);
1020
if(tcp_sd >= 0){
1021
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1022
}
1023
if(ret == -1){
1024
if(e == 0){
1025
e = errno;
1026
}
1027
perror_plus("close");
1028
}
1029
gnutls_deinit(session);
1030
errno = e;
1031
if(quit_now){
1032
errno = EINTR;
1033
retval = -1;
1034
}
708
1035
}
709
gnutls_deinit (session);
710
1036
return retval;
711
1037
}
712
1038
713
1039
static void resolve_callback(AvahiSServiceResolver *r,
714
1040
AvahiIfIndex interface,
715
AVAHI_GCC_UNUSED AvahiProtocol protocol,
1041
AvahiProtocol proto,
716
1042
AvahiResolverEvent event,
717
1043
const char *name,
718
1044
const char *type,
723
1049
AVAHI_GCC_UNUSED AvahiStringList *txt,
724
1050
AVAHI_GCC_UNUSED AvahiLookupResultFlags
725
1051
flags,
726
void* userdata) {
727
mandos_context *mc = userdata;
728
assert(r);
1052
void* mc){
1053
if(r == NULL){
1054
return;
1055
}
729
1056
730
1057
/* Called whenever a service has been resolved successfully or
731
1058
timed out */
732
1059
733
switch (event) {
1060
if(quit_now){
1061
return;
1062
}
1063
1064
switch(event){
734
1065
default:
735
1066
case AVAHI_RESOLVER_FAILURE:
736
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
737
" of type '%s' in domain '%s': %s\n", name, type, domain,
738
avahi_strerror(avahi_server_errno(mc->server)));
1067
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1068
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1069
domain,
1070
avahi_strerror(avahi_server_errno
1071
(((mandos_context*)mc)->server)));
739
1072
break;
740
1073
741
1074
case AVAHI_RESOLVER_FOUND:
743
1076
char ip[AVAHI_ADDRESS_STR_MAX];
744
1077
avahi_address_snprint(ip, sizeof(ip), address);
745
1078
if(debug){
746
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
747
PRIu16 ") on port %d\n", name, host_name, ip,
748
interface, port);
1079
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1080
PRIdMAX ") on port %" PRIu16 "\n", name,
1081
host_name, ip, (intmax_t)interface, port);
749
1082
}
750
int ret = start_mandos_communication(ip, port, interface, mc);
751
if (ret == 0){
752
avahi_simple_poll_quit(mc->simple_poll);
1083
int ret = start_mandos_communication(ip, (in_port_t)port,
1084
interface,
1085
avahi_proto_to_af(proto),
1086
mc);
1087
if(ret == 0){
1088
avahi_simple_poll_quit(simple_poll);
1089
} else {
1090
if(not add_server(ip, (in_port_t)port, interface,
1091
avahi_proto_to_af(proto),
1092
&((mandos_context*)mc)->current_server)){
1093
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1094
" list\n", name);
1095
}
753
1096
}
754
1097
}
755
1098
}
756
1099
avahi_s_service_resolver_free(r);
757
1100
}
758
1101
759
static void browse_callback( AvahiSServiceBrowser *b,
760
AvahiIfIndex interface,
761
AvahiProtocol protocol,
762
AvahiBrowserEvent event,
763
const char *name,
764
const char *type,
765
const char *domain,
766
AVAHI_GCC_UNUSED AvahiLookupResultFlags
767
flags,
768
void* userdata) {
769
mandos_context *mc = userdata;
770
assert(b);
1102
static void browse_callback(AvahiSServiceBrowser *b,
1103
AvahiIfIndex interface,
1104
AvahiProtocol protocol,
1105
AvahiBrowserEvent event,
1106
const char *name,
1107
const char *type,
1108
const char *domain,
1109
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1110
flags,
1111
void* mc){
1112
if(b == NULL){
1113
return;
1114
}
771
1115
772
1116
/* Called whenever a new services becomes available on the LAN or
773
1117
is removed from the LAN */
774
1118
775
switch (event) {
1119
if(quit_now){
1120
return;
1121
}
1122
1123
switch(event){
776
1124
default:
777
1125
case AVAHI_BROWSER_FAILURE:
778
1126
779
fprintf(stderr, "(Avahi browser) %s\n",
780
avahi_strerror(avahi_server_errno(mc->server)));
781
avahi_simple_poll_quit(mc->simple_poll);
1127
fprintf_plus(stderr, "(Avahi browser) %s\n",
1128
avahi_strerror(avahi_server_errno
1129
(((mandos_context*)mc)->server)));
1130
avahi_simple_poll_quit(simple_poll);
782
1131
return;
783
1132
784
1133
case AVAHI_BROWSER_NEW:
787
1136
the callback function is called the Avahi server will free the
788
1137
resolver for us. */
789
1138
790
if (!(avahi_s_service_resolver_new(mc->server, interface,
791
protocol, name, type, domain,
792
AVAHI_PROTO_INET6, 0,
793
resolve_callback, mc)))
794
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
795
name, avahi_strerror(avahi_server_errno(mc->server)));
1139
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1140
interface, protocol, name, type,
1141
domain, protocol, 0,
1142
resolve_callback, mc) == NULL)
1143
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1144
" %s\n", name,
1145
avahi_strerror(avahi_server_errno
1146
(((mandos_context*)mc)->server)));
796
1147
break;
797
1148
798
1149
case AVAHI_BROWSER_REMOVE:
801
1152
case AVAHI_BROWSER_ALL_FOR_NOW:
802
1153
case AVAHI_BROWSER_CACHE_EXHAUSTED:
803
1154
if(debug){
804
fprintf(stderr, "No Mandos server found, still searching...\n");
1155
fprintf_plus(stderr, "No Mandos server found, still"
1156
" searching...\n");
805
1157
}
806
1158
break;
807
1159
}
808
1160
}
809
1161
1162
/* Signal handler that stops main loop after SIGTERM */
1163
static void handle_sigterm(int sig){
1164
if(quit_now){
1165
return;
1166
}
1167
quit_now = 1;
1168
signal_received = sig;
1169
int old_errno = errno;
1170
/* set main loop to exit */
1171
if(simple_poll != NULL){
1172
avahi_simple_poll_quit(simple_poll);
1173
}
1174
errno = old_errno;
1175
}
1176
1177
bool get_flags(const char *ifname, struct ifreq *ifr){
1178
int ret;
1179
error_t ret_errno;
1180
1181
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1182
if(s < 0){
1183
ret_errno = errno;
1184
perror_plus("socket");
1185
errno = ret_errno;
1186
return false;
1187
}
1188
strcpy(ifr->ifr_name, ifname);
1189
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1190
if(ret == -1){
1191
if(debug){
1192
ret_errno = errno;
1193
perror_plus("ioctl SIOCGIFFLAGS");
1194
errno = ret_errno;
1195
}
1196
return false;
1197
}
1198
return true;
1199
}
1200
1201
bool good_flags(const char *ifname, const struct ifreq *ifr){
1202
1203
/* Reject the loopback device */
1204
if(ifr->ifr_flags & IFF_LOOPBACK){
1205
if(debug){
1206
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1207
ifname);
1208
}
1209
return false;
1210
}
1211
/* Accept point-to-point devices only if connect_to is specified */
1212
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1213
if(debug){
1214
fprintf_plus(stderr, "Accepting point-to-point interface"
1215
" \"%s\"\n", ifname);
1216
}
1217
return true;
1218
}
1219
/* Otherwise, reject non-broadcast-capable devices */
1220
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1221
if(debug){
1222
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1223
" \"%s\"\n", ifname);
1224
}
1225
return false;
1226
}
1227
/* Reject non-ARP interfaces (including dummy interfaces) */
1228
if(ifr->ifr_flags & IFF_NOARP){
1229
if(debug){
1230
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1231
ifname);
1232
}
1233
return false;
1234
}
1235
1236
/* Accept this device */
1237
if(debug){
1238
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1239
}
1240
return true;
1241
}
1242
1243
/*
1244
* This function determines if a directory entry in /sys/class/net
1245
* corresponds to an acceptable network device.
1246
* (This function is passed to scandir(3) as a filter function.)
1247
*/
1248
int good_interface(const struct dirent *if_entry){
1249
if(if_entry->d_name[0] == '.'){
1250
return 0;
1251
}
1252
1253
struct ifreq ifr;
1254
if(not get_flags(if_entry->d_name, &ifr)){
1255
if(debug){
1256
fprintf_plus(stderr, "Failed to get flags for interface "
1257
"\"%s\"\n", if_entry->d_name);
1258
}
1259
return 0;
1260
}
1261
1262
if(not good_flags(if_entry->d_name, &ifr)){
1263
return 0;
1264
}
1265
return 1;
1266
}
1267
1268
/*
1269
* This function determines if a network interface is up.
1270
*/
1271
bool interface_is_up(const char *interface){
1272
struct ifreq ifr;
1273
if(not get_flags(interface, &ifr)){
1274
if(debug){
1275
fprintf_plus(stderr, "Failed to get flags for interface "
1276
"\"%s\"\n", interface);
1277
}
1278
return false;
1279
}
1280
1281
return (bool)(ifr.ifr_flags & IFF_UP);
1282
}
1283
1284
/*
1285
* This function determines if a network interface is running
1286
*/
1287
bool interface_is_running(const char *interface){
1288
struct ifreq ifr;
1289
if(not get_flags(interface, &ifr)){
1290
if(debug){
1291
fprintf_plus(stderr, "Failed to get flags for interface "
1292
"\"%s\"\n", interface);
1293
}
1294
return false;
1295
}
1296
1297
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1298
}
1299
1300
int notdotentries(const struct dirent *direntry){
1301
/* Skip "." and ".." */
1302
if(direntry->d_name[0] == '.'
1303
and (direntry->d_name[1] == '\0'
1304
or (direntry->d_name[1] == '.'
1305
and direntry->d_name[2] == '\0'))){
1306
return 0;
1307
}
1308
return 1;
1309
}
1310
1311
/* Is this directory entry a runnable program? */
1312
int runnable_hook(const struct dirent *direntry){
1313
int ret;
1314
size_t sret;
1315
struct stat st;
1316
1317
if((direntry->d_name)[0] == '\0'){
1318
/* Empty name? */
1319
return 0;
1320
}
1321
1322
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1323
"abcdefghijklmnopqrstuvwxyz"
1324
"0123456789"
1325
"_-");
1326
if((direntry->d_name)[sret] != '\0'){
1327
/* Contains non-allowed characters */
1328
if(debug){
1329
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1330
direntry->d_name);
1331
}
1332
return 0;
1333
}
1334
1335
char *fullname = NULL;
1336
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1337
if(ret < 0){
1338
perror_plus("asprintf");
1339
return 0;
1340
}
1341
1342
ret = stat(fullname, &st);
1343
if(ret == -1){
1344
if(debug){
1345
perror_plus("Could not stat hook");
1346
}
1347
return 0;
1348
}
1349
if(not (S_ISREG(st.st_mode))){
1350
/* Not a regular file */
1351
if(debug){
1352
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1353
direntry->d_name);
1354
}
1355
return 0;
1356
}
1357
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1358
/* Not executable */
1359
if(debug){
1360
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1361
direntry->d_name);
1362
}
1363
return 0;
1364
}
1365
if(debug){
1366
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1367
direntry->d_name);
1368
}
1369
return 1;
1370
}
1371
1372
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1373
mandos_context *mc){
1374
int ret;
1375
struct timespec now;
1376
struct timespec waited_time;
1377
intmax_t block_time;
1378
1379
while(true){
1380
if(mc->current_server == NULL){
1381
if (debug){
1382
fprintf_plus(stderr, "Wait until first server is found."
1383
" No timeout!\n");
1384
}
1385
ret = avahi_simple_poll_iterate(s, -1);
1386
} else {
1387
if (debug){
1388
fprintf_plus(stderr, "Check current_server if we should run"
1389
" it, or wait\n");
1390
}
1391
/* the current time */
1392
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1393
if(ret == -1){
1394
perror_plus("clock_gettime");
1395
return -1;
1396
}
1397
/* Calculating in ms how long time between now and server
1398
who we visted longest time ago. Now - last seen. */
1399
waited_time.tv_sec = (now.tv_sec
1400
- mc->current_server->last_seen.tv_sec);
1401
waited_time.tv_nsec = (now.tv_nsec
1402
- mc->current_server->last_seen.tv_nsec);
1403
/* total time is 10s/10,000ms.
1404
Converting to s from ms by dividing by 1,000,
1405
and ns to ms by dividing by 1,000,000. */
1406
block_time = ((retry_interval
1407
- ((intmax_t)waited_time.tv_sec * 1000))
1408
- ((intmax_t)waited_time.tv_nsec / 1000000));
1409
1410
if (debug){
1411
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1412
block_time);
1413
}
1414
1415
if(block_time <= 0){
1416
ret = start_mandos_communication(mc->current_server->ip,
1417
mc->current_server->port,
1418
mc->current_server->if_index,
1419
mc->current_server->af, mc);
1420
if(ret == 0){
1421
avahi_simple_poll_quit(s);
1422
return 0;
1423
}
1424
ret = clock_gettime(CLOCK_MONOTONIC,
1425
&mc->current_server->last_seen);
1426
if(ret == -1){
1427
perror_plus("clock_gettime");
1428
return -1;
1429
}
1430
mc->current_server = mc->current_server->next;
1431
block_time = 0; /* Call avahi to find new Mandos
1432
servers, but don't block */
1433
}
1434
1435
ret = avahi_simple_poll_iterate(s, (int)block_time);
1436
}
1437
if(ret != 0){
1438
if (ret > 0 or errno != EINTR){
1439
return (ret != 1) ? ret : 0;
1440
}
1441
}
1442
}
1443
}
1444
1445
/* Set effective uid to 0, return errno */
1446
error_t raise_privileges(void){
1447
error_t old_errno = errno;
1448
error_t ret_errno = 0;
1449
if(seteuid(0) == -1){
1450
ret_errno = errno;
1451
perror_plus("seteuid");
1452
}
1453
errno = old_errno;
1454
return ret_errno;
1455
}
1456
1457
/* Set effective and real user ID to 0. Return errno. */
1458
error_t raise_privileges_permanently(void){
1459
error_t old_errno = errno;
1460
error_t ret_errno = raise_privileges();
1461
if(ret_errno != 0){
1462
errno = old_errno;
1463
return ret_errno;
1464
}
1465
if(setuid(0) == -1){
1466
ret_errno = errno;
1467
perror_plus("seteuid");
1468
}
1469
errno = old_errno;
1470
return ret_errno;
1471
}
1472
1473
/* Set effective user ID to unprivileged saved user ID */
1474
error_t lower_privileges(void){
1475
error_t old_errno = errno;
1476
error_t ret_errno = 0;
1477
if(seteuid(uid) == -1){
1478
ret_errno = errno;
1479
perror_plus("seteuid");
1480
}
1481
errno = old_errno;
1482
return ret_errno;
1483
}
1484
1485
/* Lower privileges permanently */
1486
error_t lower_privileges_permanently(void){
1487
error_t old_errno = errno;
1488
error_t ret_errno = 0;
1489
if(setuid(uid) == -1){
1490
ret_errno = errno;
1491
perror_plus("setuid");
1492
}
1493
errno = old_errno;
1494
return ret_errno;
1495
}
1496
1497
bool run_network_hooks(const char *mode, const char *interface,
1498
const float delay){
1499
struct dirent **direntries;
1500
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1501
alphasort);
1502
if(numhooks == -1){
1503
if(errno == ENOENT){
1504
if(debug){
1505
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1506
" found\n", hookdir);
1507
}
1508
} else {
1509
perror_plus("scandir");
1510
}
1511
} else {
1512
struct dirent *direntry;
1513
int ret;
1514
int devnull = open("/dev/null", O_RDONLY);
1515
for(int i = 0; i < numhooks; i++){
1516
direntry = direntries[i];
1517
char *fullname = NULL;
1518
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1519
if(ret < 0){
1520
perror_plus("asprintf");
1521
continue;
1522
}
1523
if(debug){
1524
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1525
direntry->d_name);
1526
}
1527
pid_t hook_pid = fork();
1528
if(hook_pid == 0){
1529
/* Child */
1530
/* Raise privileges */
1531
raise_privileges_permanently();
1532
/* Set group */
1533
errno = 0;
1534
ret = setgid(0);
1535
if(ret == -1){
1536
perror_plus("setgid");
1537
}
1538
/* Reset supplementary groups */
1539
errno = 0;
1540
ret = setgroups(0, NULL);
1541
if(ret == -1){
1542
perror_plus("setgroups");
1543
}
1544
dup2(devnull, STDIN_FILENO);
1545
close(devnull);
1546
dup2(STDERR_FILENO, STDOUT_FILENO);
1547
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1548
if(ret == -1){
1549
perror_plus("setenv");
1550
_exit(EX_OSERR);
1551
}
1552
ret = setenv("DEVICE", interface, 1);
1553
if(ret == -1){
1554
perror_plus("setenv");
1555
_exit(EX_OSERR);
1556
}
1557
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1558
if(ret == -1){
1559
perror_plus("setenv");
1560
_exit(EX_OSERR);
1561
}
1562
ret = setenv("MODE", mode, 1);
1563
if(ret == -1){
1564
perror_plus("setenv");
1565
_exit(EX_OSERR);
1566
}
1567
char *delaystring;
1568
ret = asprintf(&delaystring, "%f", delay);
1569
if(ret == -1){
1570
perror_plus("asprintf");
1571
_exit(EX_OSERR);
1572
}
1573
ret = setenv("DELAY", delaystring, 1);
1574
if(ret == -1){
1575
free(delaystring);
1576
perror_plus("setenv");
1577
_exit(EX_OSERR);
1578
}
1579
free(delaystring);
1580
if(connect_to != NULL){
1581
ret = setenv("CONNECT", connect_to, 1);
1582
if(ret == -1){
1583
perror_plus("setenv");
1584
_exit(EX_OSERR);
1585
}
1586
}
1587
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1588
perror_plus("execl");
1589
_exit(EXIT_FAILURE);
1590
}
1591
} else {
1592
int status;
1593
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1594
perror_plus("waitpid");
1595
free(fullname);
1596
continue;
1597
}
1598
if(WIFEXITED(status)){
1599
if(WEXITSTATUS(status) != 0){
1600
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1601
" with status %d\n", direntry->d_name,
1602
WEXITSTATUS(status));
1603
free(fullname);
1604
continue;
1605
}
1606
} else if(WIFSIGNALED(status)){
1607
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1608
" signal %d\n", direntry->d_name,
1609
WTERMSIG(status));
1610
free(fullname);
1611
continue;
1612
} else {
1613
fprintf_plus(stderr, "Warning: network hook \"%s\""
1614
" crashed\n", direntry->d_name);
1615
free(fullname);
1616
continue;
1617
}
1618
}
1619
free(fullname);
1620
if(debug){
1621
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1622
direntry->d_name);
1623
}
1624
}
1625
close(devnull);
1626
}
1627
return true;
1628
}
1629
1630
error_t bring_up_interface(const char *const interface,
1631
const float delay){
1632
int sd = -1;
1633
error_t old_errno = errno;
1634
error_t ret_errno = 0;
1635
int ret, ret_setflags;
1636
struct ifreq network;
1637
unsigned int if_index = if_nametoindex(interface);
1638
if(if_index == 0){
1639
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1640
errno = old_errno;
1641
return ENXIO;
1642
}
1643
1644
if(quit_now){
1645
errno = old_errno;
1646
return EINTR;
1647
}
1648
1649
if(not interface_is_up(interface)){
1650
if(not get_flags(interface, &network) and debug){
1651
ret_errno = errno;
1652
fprintf_plus(stderr, "Failed to get flags for interface "
1653
"\"%s\"\n", interface);
1654
return ret_errno;
1655
}
1656
network.ifr_flags |= IFF_UP;
1657
1658
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1659
if(sd < 0){
1660
ret_errno = errno;
1661
perror_plus("socket");
1662
errno = old_errno;
1663
return ret_errno;
1664
}
1665
1666
if(quit_now){
1667
close(sd);
1668
errno = old_errno;
1669
return EINTR;
1670
}
1671
1672
if(debug){
1673
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1674
interface);
1675
}
1676
1677
/* Raise priviliges */
1678
raise_privileges();
1679
1680
#ifdef __linux__
1681
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1682
messages about the network interface to mess up the prompt */
1683
int ret_linux = klogctl(8, NULL, 5);
1684
bool restore_loglevel = true;
1685
if(ret_linux == -1){
1686
restore_loglevel = false;
1687
perror_plus("klogctl");
1688
}
1689
#endif /* __linux__ */
1690
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1691
ret_errno = errno;
1692
#ifdef __linux__
1693
if(restore_loglevel){
1694
ret_linux = klogctl(7, NULL, 0);
1695
if(ret_linux == -1){
1696
perror_plus("klogctl");
1697
}
1698
}
1699
#endif /* __linux__ */
1700
1701
/* Lower privileges */
1702
lower_privileges();
1703
1704
/* Close the socket */
1705
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1706
if(ret == -1){
1707
perror_plus("close");
1708
}
1709
1710
if(ret_setflags == -1){
1711
errno = ret_errno;
1712
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1713
errno = old_errno;
1714
return ret_errno;
1715
}
1716
} else if(debug){
1717
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1718
interface);
1719
}
1720
1721
/* Sleep checking until interface is running.
1722
Check every 0.25s, up to total time of delay */
1723
for(int i=0; i < delay * 4; i++){
1724
if(interface_is_running(interface)){
1725
break;
1726
}
1727
struct timespec sleeptime = { .tv_nsec = 250000000 };
1728
ret = nanosleep(&sleeptime, NULL);
1729
if(ret == -1 and errno != EINTR){
1730
perror_plus("nanosleep");
1731
}
1732
}
1733
1734
errno = old_errno;
1735
return 0;
1736
}
1737
1738
error_t take_down_interface(const char *const interface){
1739
error_t old_errno = errno;
1740
struct ifreq network;
1741
unsigned int if_index = if_nametoindex(interface);
1742
if(if_index == 0){
1743
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1744
errno = old_errno;
1745
return ENXIO;
1746
}
1747
if(interface_is_up(interface)){
1748
error_t ret_errno = 0;
1749
if(not get_flags(interface, &network) and debug){
1750
ret_errno = errno;
1751
fprintf_plus(stderr, "Failed to get flags for interface "
1752
"\"%s\"\n", interface);
1753
return ret_errno;
1754
}
1755
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1756
1757
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1758
if(sd < 0){
1759
ret_errno = errno;
1760
perror_plus("socket");
1761
errno = old_errno;
1762
return ret_errno;
1763
}
1764
1765
if(debug){
1766
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1767
interface);
1768
}
1769
1770
/* Raise priviliges */
1771
raise_privileges();
1772
1773
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1774
ret_errno = errno;
1775
1776
/* Lower privileges */
1777
lower_privileges();
1778
1779
/* Close the socket */
1780
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1781
if(ret == -1){
1782
perror_plus("close");
1783
}
1784
1785
if(ret_setflags == -1){
1786
errno = ret_errno;
1787
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1788
errno = old_errno;
1789
return ret_errno;
1790
}
1791
} else if(debug){
1792
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1793
interface);
1794
}
1795
1796
errno = old_errno;
1797
return 0;
1798
}
1799
810
1800
int main(int argc, char *argv[]){
811
AvahiSServiceBrowser *sb = NULL;
812
int error;
813
int ret;
814
int exitcode = EXIT_SUCCESS;
815
const char *interface = "eth0";
816
struct ifreq network;
817
int sd;
818
uid_t uid;
819
gid_t gid;
820
char *connect_to = NULL;
821
char tempdir[] = "/tmp/mandosXXXXXX";
822
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
823
const char *seckey = PATHDIR "/" SECKEY;
824
const char *pubkey = PATHDIR "/" PUBKEY;
825
826
mandos_context mc = { .simple_poll = NULL, .server = NULL,
827
.dh_bits = 1024, .priority = "SECURE256"
828
":!CTYPE-X.509:+CTYPE-OPENPGP" };
829
bool gnutls_initalized = false;
830
bool gpgme_initalized = false;
831
832
{
833
struct argp_option options[] = {
834
{ .name = "debug", .key = 128,
835
.doc = "Debug mode", .group = 3 },
836
{ .name = "connect", .key = 'c',
837
.arg = "ADDRESS:PORT",
838
.doc = "Connect directly to a specific Mandos server",
839
.group = 1 },
840
{ .name = "interface", .key = 'i',
841
.arg = "NAME",
842
.doc = "Interface that will be used to search for Mandos"
843
" servers",
844
.group = 1 },
845
{ .name = "seckey", .key = 's',
846
.arg = "FILE",
847
.doc = "OpenPGP secret key file base name",
848
.group = 1 },
849
{ .name = "pubkey", .key = 'p',
850
.arg = "FILE",
851
.doc = "OpenPGP public key file base name",
852
.group = 2 },
853
{ .name = "dh-bits", .key = 129,
854
.arg = "BITS",
855
.doc = "Bit length of the prime number used in the"
856
" Diffie-Hellman key exchange",
857
.group = 2 },
858
{ .name = "priority", .key = 130,
859
.arg = "STRING",
860
.doc = "GnuTLS priority string for the TLS handshake",
861
.group = 1 },
862
{ .name = NULL }
863
};
864
865
error_t parse_opt (int key, char *arg,
866
struct argp_state *state) {
867
/* Get the INPUT argument from `argp_parse', which we know is
868
a pointer to our plugin list pointer. */
869
switch (key) {
870
case 128: /* --debug */
871
debug = true;
872
break;
873
case 'c': /* --connect */
874
connect_to = arg;
875
break;
876
case 'i': /* --interface */
877
interface = arg;
878
break;
879
case 's': /* --seckey */
880
seckey = arg;
881
break;
882
case 'p': /* --pubkey */
883
pubkey = arg;
884
break;
885
case 129: /* --dh-bits */
886
errno = 0;
887
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
888
if (errno){
889
perror("strtol");
890
exit(EXIT_FAILURE);
891
}
892
break;
893
case 130: /* --priority */
894
mc.priority = arg;
895
break;
896
case ARGP_KEY_ARG:
897
argp_usage (state);
898
case ARGP_KEY_END:
899
break;
900
default:
901
return ARGP_ERR_UNKNOWN;
902
}
903
return 0;
904
}
905
906
struct argp argp = { .options = options, .parser = parse_opt,
907
.args_doc = "",
908
.doc = "Mandos client -- Get and decrypt"
909
" passwords from a Mandos server" };
910
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
911
if (ret == ARGP_ERR_UNKNOWN){
912
fprintf(stderr, "Unknown error while parsing arguments\n");
913
exitcode = EXIT_FAILURE;
914
goto end;
915
}
916
}
917
918
/* If the interface is down, bring it up */
919
{
920
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
921
if(sd < 0) {
922
perror("socket");
923
exitcode = EXIT_FAILURE;
924
goto end;
925
}
926
strcpy(network.ifr_name, interface);
927
ret = ioctl(sd, SIOCGIFFLAGS, &network);
928
if(ret == -1){
929
perror("ioctl SIOCGIFFLAGS");
930
exitcode = EXIT_FAILURE;
931
goto end;
932
}
933
if((network.ifr_flags & IFF_UP) == 0){
934
network.ifr_flags |= IFF_UP;
935
ret = ioctl(sd, SIOCSIFFLAGS, &network);
936
if(ret == -1){
937
perror("ioctl SIOCSIFFLAGS");
938
exitcode = EXIT_FAILURE;
939
goto end;
940
}
941
}
942
ret = TEMP_FAILURE_RETRY(close(sd));
943
if(ret == -1){
944
perror("close");
945
}
946
}
947
948
uid = getuid();
949
gid = getgid();
950
951
ret = setuid(uid);
952
if (ret == -1){
953
perror("setuid");
954
}
955
956
setgid(gid);
957
if (ret == -1){
958
perror("setgid");
959
}
960
961
ret = init_gnutls_global(&mc, pubkey, seckey);
962
if (ret == -1){
963
fprintf(stderr, "init_gnutls_global failed\n");
964
exitcode = EXIT_FAILURE;
965
goto end;
966
} else {
967
gnutls_initalized = true;
968
}
969
970
if(mkdtemp(tempdir) == NULL){
971
perror("mkdtemp");
972
tempdir[0] = '\0';
973
goto end;
974
}
975
976
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
977
fprintf(stderr, "gpgme_initalized failed\n");
978
exitcode = EXIT_FAILURE;
979
goto end;
980
} else {
981
gpgme_initalized = true;
982
}
983
984
if_index = (AvahiIfIndex) if_nametoindex(interface);
985
if(if_index == 0){
986
fprintf(stderr, "No such interface: \"%s\"\n", interface);
987
exit(EXIT_FAILURE);
988
}
989
990
if(connect_to != NULL){
991
/* Connect directly, do not use Zeroconf */
992
/* (Mainly meant for debugging) */
993
char *address = strrchr(connect_to, ':');
994
if(address == NULL){
995
fprintf(stderr, "No colon in address\n");
996
exitcode = EXIT_FAILURE;
997
goto end;
998
}
1801
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1802
.priority = "SECURE256:!CTYPE-X.509:"
1803
"+CTYPE-OPENPGP", .current_server = NULL,
1804
.interfaces = NULL, .interfaces_size = 0 };
1805
AvahiSServiceBrowser *sb = NULL;
1806
error_t ret_errno;
1807
int ret;
1808
intmax_t tmpmax;
1809
char *tmp;
1810
int exitcode = EXIT_SUCCESS;
1811
char *interfaces_to_take_down = NULL;
1812
size_t interfaces_to_take_down_size = 0;
1813
char tempdir[] = "/tmp/mandosXXXXXX";
1814
bool tempdir_created = false;
1815
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1816
const char *seckey = PATHDIR "/" SECKEY;
1817
const char *pubkey = PATHDIR "/" PUBKEY;
1818
char *interfaces_hooks = NULL;
1819
1820
bool gnutls_initialized = false;
1821
bool gpgme_initialized = false;
1822
float delay = 2.5f;
1823
double retry_interval = 10; /* 10s between trying a server and
1824
retrying the same server again */
1825
1826
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1827
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1828
1829
uid = getuid();
1830
gid = getgid();
1831
1832
/* Lower any group privileges we might have, just to be safe */
1833
errno = 0;
1834
ret = setgid(gid);
1835
if(ret == -1){
1836
perror_plus("setgid");
1837
}
1838
1839
/* Lower user privileges (temporarily) */
1840
errno = 0;
1841
ret = seteuid(uid);
1842
if(ret == -1){
1843
perror_plus("seteuid");
1844
}
1845
1846
if(quit_now){
1847
goto end;
1848
}
1849
1850
{
1851
struct argp_option options[] = {
1852
{ .name = "debug", .key = 128,
1853
.doc = "Debug mode", .group = 3 },
1854
{ .name = "connect", .key = 'c',
1855
.arg = "ADDRESS:PORT",
1856
.doc = "Connect directly to a specific Mandos server",
1857
.group = 1 },
1858
{ .name = "interface", .key = 'i',
1859
.arg = "NAME",
1860
.doc = "Network interface that will be used to search for"
1861
" Mandos servers",
1862
.group = 1 },
1863
{ .name = "seckey", .key = 's',
1864
.arg = "FILE",
1865
.doc = "OpenPGP secret key file base name",
1866
.group = 1 },
1867
{ .name = "pubkey", .key = 'p',
1868
.arg = "FILE",
1869
.doc = "OpenPGP public key file base name",
1870
.group = 2 },
1871
{ .name = "dh-bits", .key = 129,
1872
.arg = "BITS",
1873
.doc = "Bit length of the prime number used in the"
1874
" Diffie-Hellman key exchange",
1875
.group = 2 },
1876
{ .name = "priority", .key = 130,
1877
.arg = "STRING",
1878
.doc = "GnuTLS priority string for the TLS handshake",
1879
.group = 1 },
1880
{ .name = "delay", .key = 131,
1881
.arg = "SECONDS",
1882
.doc = "Maximum delay to wait for interface startup",
1883
.group = 2 },
1884
{ .name = "retry", .key = 132,
1885
.arg = "SECONDS",
1886
.doc = "Retry interval used when denied by the Mandos server",
1887
.group = 2 },
1888
{ .name = "network-hook-dir", .key = 133,
1889
.arg = "DIR",
1890
.doc = "Directory where network hooks are located",
1891
.group = 2 },
1892
/*
1893
* These reproduce what we would get without ARGP_NO_HELP
1894
*/
1895
{ .name = "help", .key = '?',
1896
.doc = "Give this help list", .group = -1 },
1897
{ .name = "usage", .key = -3,
1898
.doc = "Give a short usage message", .group = -1 },
1899
{ .name = "version", .key = 'V',
1900
.doc = "Print program version", .group = -1 },
1901
{ .name = NULL }
1902
};
1903
1904
error_t parse_opt(int key, char *arg,
1905
struct argp_state *state){
999
1906
errno = 0;
1000
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
1001
if(errno){
1002
perror("Bad port number");
1003
exitcode = EXIT_FAILURE;
1907
switch(key){
1908
case 128: /* --debug */
1909
debug = true;
1910
break;
1911
case 'c': /* --connect */
1912
connect_to = arg;
1913
break;
1914
case 'i': /* --interface */
1915
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1916
arg, (int)',');
1917
if(ret_errno != 0){
1918
argp_error(state, "%s", strerror(ret_errno));
1919
}
1920
break;
1921
case 's': /* --seckey */
1922
seckey = arg;
1923
break;
1924
case 'p': /* --pubkey */
1925
pubkey = arg;
1926
break;
1927
case 129: /* --dh-bits */
1928
errno = 0;
1929
tmpmax = strtoimax(arg, &tmp, 10);
1930
if(errno != 0 or tmp == arg or *tmp != '\0'
1931
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1932
argp_error(state, "Bad number of DH bits");
1933
}
1934
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1935
break;
1936
case 130: /* --priority */
1937
mc.priority = arg;
1938
break;
1939
case 131: /* --delay */
1940
errno = 0;
1941
delay = strtof(arg, &tmp);
1942
if(errno != 0 or tmp == arg or *tmp != '\0'){
1943
argp_error(state, "Bad delay");
1944
}
1945
case 132: /* --retry */
1946
errno = 0;
1947
retry_interval = strtod(arg, &tmp);
1948
if(errno != 0 or tmp == arg or *tmp != '\0'
1949
or (retry_interval * 1000) > INT_MAX
1950
or retry_interval < 0){
1951
argp_error(state, "Bad retry interval");
1952
}
1953
break;
1954
case 133: /* --network-hook-dir */
1955
hookdir = arg;
1956
break;
1957
/*
1958
* These reproduce what we would get without ARGP_NO_HELP
1959
*/
1960
case '?': /* --help */
1961
argp_state_help(state, state->out_stream,
1962
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1963
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1964
case -3: /* --usage */
1965
argp_state_help(state, state->out_stream,
1966
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1967
case 'V': /* --version */
1968
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1969
exit(argp_err_exit_status);
1970
break;
1971
default:
1972
return ARGP_ERR_UNKNOWN;
1973
}
1974
return errno;
1975
}
1976
1977
struct argp argp = { .options = options, .parser = parse_opt,
1978
.args_doc = "",
1979
.doc = "Mandos client -- Get and decrypt"
1980
" passwords from a Mandos server" };
1981
ret = argp_parse(&argp, argc, argv,
1982
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1983
switch(ret){
1984
case 0:
1985
break;
1986
case ENOMEM:
1987
default:
1988
errno = ret;
1989
perror_plus("argp_parse");
1990
exitcode = EX_OSERR;
1991
goto end;
1992
case EINVAL:
1993
exitcode = EX_USAGE;
1994
goto end;
1995
}
1996
}
1997
1998
{
1999
/* Work around Debian bug #633582:
2000
<http://bugs.debian.org/633582> */
2001
2002
/* Re-raise priviliges */
2003
if(raise_privileges() == 0){
2004
struct stat st;
2005
2006
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2007
int seckey_fd = open(seckey, O_RDONLY);
2008
if(seckey_fd == -1){
2009
perror_plus("open");
2010
} else {
2011
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2012
if(ret == -1){
2013
perror_plus("fstat");
2014
} else {
2015
if(S_ISREG(st.st_mode)
2016
and st.st_uid == 0 and st.st_gid == 0){
2017
ret = fchown(seckey_fd, uid, gid);
2018
if(ret == -1){
2019
perror_plus("fchown");
2020
}
2021
}
2022
}
2023
TEMP_FAILURE_RETRY(close(seckey_fd));
2024
}
2025
}
2026
2027
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2028
int pubkey_fd = open(pubkey, O_RDONLY);
2029
if(pubkey_fd == -1){
2030
perror_plus("open");
2031
} else {
2032
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2033
if(ret == -1){
2034
perror_plus("fstat");
2035
} else {
2036
if(S_ISREG(st.st_mode)
2037
and st.st_uid == 0 and st.st_gid == 0){
2038
ret = fchown(pubkey_fd, uid, gid);
2039
if(ret == -1){
2040
perror_plus("fchown");
2041
}
2042
}
2043
}
2044
TEMP_FAILURE_RETRY(close(pubkey_fd));
2045
}
2046
}
2047
2048
/* Lower privileges */
2049
lower_privileges();
2050
}
2051
}
2052
2053
/* Remove invalid interface names (except "none") */
2054
{
2055
char *interface = NULL;
2056
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2057
interface))){
2058
if(strcmp(interface, "none") != 0
2059
and if_nametoindex(interface) == 0){
2060
if(interface[0] != '\0'){
2061
fprintf_plus(stderr, "Not using nonexisting interface"
2062
" \"%s\"\n", interface);
2063
}
2064
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2065
interface = NULL;
2066
}
2067
}
2068
}
2069
2070
/* Run network hooks */
2071
{
2072
if(mc.interfaces != NULL){
2073
interfaces_hooks = malloc(mc.interfaces_size);
2074
if(interfaces_hooks == NULL){
2075
perror_plus("malloc");
1004
2076
goto end;
1005
2077
}
1006
*address = '\0';
1007
address = connect_to;
1008
ret = start_mandos_communication(address, port, if_index, &mc);
1009
if(ret < 0){
1010
exitcode = EXIT_FAILURE;
1011
} else {
1012
exitcode = EXIT_SUCCESS;
1013
}
1014
goto end;
1015
}
1016
1017
if (not debug){
1018
avahi_set_log_function(empty_log);
1019
}
1020
1021
/* Initialize the pseudo-RNG for Avahi */
1022
srand((unsigned int) time(NULL));
1023
1024
/* Allocate main Avahi loop object */
1025
mc.simple_poll = avahi_simple_poll_new();
1026
if (mc.simple_poll == NULL) {
1027
fprintf(stderr, "Avahi: Failed to create simple poll"
1028
" object.\n");
1029
exitcode = EXIT_FAILURE;
1030
goto end;
1031
}
1032
1033
{
1034
AvahiServerConfig config;
1035
/* Do not publish any local Zeroconf records */
1036
avahi_server_config_init(&config);
1037
config.publish_hinfo = 0;
1038
config.publish_addresses = 0;
1039
config.publish_workstation = 0;
1040
config.publish_domain = 0;
1041
1042
/* Allocate a new server */
1043
mc.server = avahi_server_new(avahi_simple_poll_get
1044
(mc.simple_poll), &config, NULL,
1045
NULL, &error);
1046
1047
/* Free the Avahi configuration data */
1048
avahi_server_config_free(&config);
1049
}
1050
1051
/* Check if creating the Avahi server object succeeded */
1052
if (mc.server == NULL) {
1053
fprintf(stderr, "Failed to create Avahi server: %s\n",
1054
avahi_strerror(error));
1055
exitcode = EXIT_FAILURE;
1056
goto end;
1057
}
1058
1059
/* Create the Avahi service browser */
1060
sb = avahi_s_service_browser_new(mc.server, if_index,
1061
AVAHI_PROTO_INET6,
1062
"_mandos._tcp", NULL, 0,
1063
browse_callback, &mc);
1064
if (sb == NULL) {
1065
fprintf(stderr, "Failed to create service browser: %s\n",
1066
avahi_strerror(avahi_server_errno(mc.server)));
1067
exitcode = EXIT_FAILURE;
1068
goto end;
1069
}
1070
1071
/* Run the main loop */
1072
1073
if (debug){
1074
fprintf(stderr, "Starting Avahi loop search\n");
1075
}
1076
1077
avahi_simple_poll_loop(mc.simple_poll);
1078
2078
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2079
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2080
}
2081
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2082
interfaces_hooks : "", delay)){
2083
goto end;
2084
}
2085
}
2086
2087
if(not debug){
2088
avahi_set_log_function(empty_log);
2089
}
2090
2091
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2092
from the signal handler */
2093
/* Initialize the pseudo-RNG for Avahi */
2094
srand((unsigned int) time(NULL));
2095
simple_poll = avahi_simple_poll_new();
2096
if(simple_poll == NULL){
2097
fprintf_plus(stderr,
2098
"Avahi: Failed to create simple poll object.\n");
2099
exitcode = EX_UNAVAILABLE;
2100
goto end;
2101
}
2102
2103
sigemptyset(&sigterm_action.sa_mask);
2104
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2105
if(ret == -1){
2106
perror_plus("sigaddset");
2107
exitcode = EX_OSERR;
2108
goto end;
2109
}
2110
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2111
if(ret == -1){
2112
perror_plus("sigaddset");
2113
exitcode = EX_OSERR;
2114
goto end;
2115
}
2116
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2117
if(ret == -1){
2118
perror_plus("sigaddset");
2119
exitcode = EX_OSERR;
2120
goto end;
2121
}
2122
/* Need to check if the handler is SIG_IGN before handling:
2123
| [[info:libc:Initial Signal Actions]] |
2124
| [[info:libc:Basic Signal Handling]] |
2125
*/
2126
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2127
if(ret == -1){
2128
perror_plus("sigaction");
2129
return EX_OSERR;
2130
}
2131
if(old_sigterm_action.sa_handler != SIG_IGN){
2132
ret = sigaction(SIGINT, &sigterm_action, NULL);
2133
if(ret == -1){
2134
perror_plus("sigaction");
2135
exitcode = EX_OSERR;
2136
goto end;
2137
}
2138
}
2139
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2140
if(ret == -1){
2141
perror_plus("sigaction");
2142
return EX_OSERR;
2143
}
2144
if(old_sigterm_action.sa_handler != SIG_IGN){
2145
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2146
if(ret == -1){
2147
perror_plus("sigaction");
2148
exitcode = EX_OSERR;
2149
goto end;
2150
}
2151
}
2152
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2153
if(ret == -1){
2154
perror_plus("sigaction");
2155
return EX_OSERR;
2156
}
2157
if(old_sigterm_action.sa_handler != SIG_IGN){
2158
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2159
if(ret == -1){
2160
perror_plus("sigaction");
2161
exitcode = EX_OSERR;
2162
goto end;
2163
}
2164
}
2165
2166
/* If no interfaces were specified, make a list */
2167
if(mc.interfaces == NULL){
2168
struct dirent **direntries;
2169
/* Look for any good interfaces */
2170
ret = scandir(sys_class_net, &direntries, good_interface,
2171
alphasort);
2172
if(ret >= 1){
2173
/* Add all found interfaces to interfaces list */
2174
for(int i = 0; i < ret; ++i){
2175
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2176
direntries[i]->d_name);
2177
if(ret_errno != 0){
2178
errno = ret_errno;
2179
perror_plus("argz_add");
2180
continue;
2181
}
2182
if(debug){
2183
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2184
direntries[i]->d_name);
2185
}
2186
}
2187
free(direntries);
2188
} else {
2189
free(direntries);
2190
fprintf_plus(stderr, "Could not find a network interface\n");
2191
exitcode = EXIT_FAILURE;
2192
goto end;
2193
}
2194
}
2195
2196
/* Bring up interfaces which are down, and remove any "none"s */
2197
{
2198
char *interface = NULL;
2199
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2200
interface))){
2201
/* If interface name is "none", stop bringing up interfaces.
2202
Also remove all instances of "none" from the list */
2203
if(strcmp(interface, "none") == 0){
2204
argz_delete(&mc.interfaces, &mc.interfaces_size,
2205
interface);
2206
interface = NULL;
2207
while((interface = argz_next(mc.interfaces,
2208
mc.interfaces_size, interface))){
2209
if(strcmp(interface, "none") == 0){
2210
argz_delete(&mc.interfaces, &mc.interfaces_size,
2211
interface);
2212
interface = NULL;
2213
}
2214
}
2215
break;
2216
}
2217
bool interface_was_up = interface_is_up(interface);
2218
ret = bring_up_interface(interface, delay);
2219
if(not interface_was_up){
2220
if(ret != 0){
2221
errno = ret;
2222
perror_plus("Failed to bring up interface");
2223
} else {
2224
ret_errno = argz_add(&interfaces_to_take_down,
2225
&interfaces_to_take_down_size,
2226
interface);
2227
if(ret_errno != 0){
2228
errno = ret_errno;
2229
perror_plus("argz_add");
2230
}
2231
}
2232
}
2233
}
2234
if(debug and (interfaces_to_take_down == NULL)){
2235
fprintf_plus(stderr, "No interfaces were brought up\n");
2236
}
2237
}
2238
2239
/* If we only got one interface, explicitly use only that one */
2240
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2241
if(debug){
2242
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2243
mc.interfaces);
2244
}
2245
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2246
}
2247
2248
if(quit_now){
2249
goto end;
2250
}
2251
2252
ret = init_gnutls_global(pubkey, seckey, &mc);
2253
if(ret == -1){
2254
fprintf_plus(stderr, "init_gnutls_global failed\n");
2255
exitcode = EX_UNAVAILABLE;
2256
goto end;
2257
} else {
2258
gnutls_initialized = true;
2259
}
2260
2261
if(quit_now){
2262
goto end;
2263
}
2264
2265
if(mkdtemp(tempdir) == NULL){
2266
perror_plus("mkdtemp");
2267
goto end;
2268
}
2269
tempdir_created = true;
2270
2271
if(quit_now){
2272
goto end;
2273
}
2274
2275
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2276
fprintf_plus(stderr, "init_gpgme failed\n");
2277
exitcode = EX_UNAVAILABLE;
2278
goto end;
2279
} else {
2280
gpgme_initialized = true;
2281
}
2282
2283
if(quit_now){
2284
goto end;
2285
}
2286
2287
if(connect_to != NULL){
2288
/* Connect directly, do not use Zeroconf */
2289
/* (Mainly meant for debugging) */
2290
char *address = strrchr(connect_to, ':');
2291
2292
if(address == NULL){
2293
fprintf_plus(stderr, "No colon in address\n");
2294
exitcode = EX_USAGE;
2295
goto end;
2296
}
2297
2298
if(quit_now){
2299
goto end;
2300
}
2301
2302
in_port_t port;
2303
errno = 0;
2304
tmpmax = strtoimax(address+1, &tmp, 10);
2305
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2306
or tmpmax != (in_port_t)tmpmax){
2307
fprintf_plus(stderr, "Bad port number\n");
2308
exitcode = EX_USAGE;
2309
goto end;
2310
}
2311
2312
if(quit_now){
2313
goto end;
2314
}
2315
2316
port = (in_port_t)tmpmax;
2317
*address = '\0';
2318
/* Colon in address indicates IPv6 */
2319
int af;
2320
if(strchr(connect_to, ':') != NULL){
2321
af = AF_INET6;
2322
/* Accept [] around IPv6 address - see RFC 5952 */
2323
if(connect_to[0] == '[' and address[-1] == ']')
2324
{
2325
connect_to++;
2326
address[-1] = '\0';
2327
}
2328
} else {
2329
af = AF_INET;
2330
}
2331
address = connect_to;
2332
2333
if(quit_now){
2334
goto end;
2335
}
2336
2337
while(not quit_now){
2338
ret = start_mandos_communication(address, port, if_index, af,
2339
&mc);
2340
if(quit_now or ret == 0){
2341
break;
2342
}
2343
if(debug){
2344
fprintf_plus(stderr, "Retrying in %d seconds\n",
2345
(int)retry_interval);
2346
}
2347
sleep((unsigned int)retry_interval);
2348
}
2349
2350
if (not quit_now){
2351
exitcode = EXIT_SUCCESS;
2352
}
2353
2354
goto end;
2355
}
2356
2357
if(quit_now){
2358
goto end;
2359
}
2360
2361
{
2362
AvahiServerConfig config;
2363
/* Do not publish any local Zeroconf records */
2364
avahi_server_config_init(&config);
2365
config.publish_hinfo = 0;
2366
config.publish_addresses = 0;
2367
config.publish_workstation = 0;
2368
config.publish_domain = 0;
2369
2370
/* Allocate a new server */
2371
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2372
&config, NULL, NULL, &ret_errno);
2373
2374
/* Free the Avahi configuration data */
2375
avahi_server_config_free(&config);
2376
}
2377
2378
/* Check if creating the Avahi server object succeeded */
2379
if(mc.server == NULL){
2380
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2381
avahi_strerror(ret_errno));
2382
exitcode = EX_UNAVAILABLE;
2383
goto end;
2384
}
2385
2386
if(quit_now){
2387
goto end;
2388
}
2389
2390
/* Create the Avahi service browser */
2391
sb = avahi_s_service_browser_new(mc.server, if_index,
2392
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2393
NULL, 0, browse_callback,
2394
(void *)&mc);
2395
if(sb == NULL){
2396
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2397
avahi_strerror(avahi_server_errno(mc.server)));
2398
exitcode = EX_UNAVAILABLE;
2399
goto end;
2400
}
2401
2402
if(quit_now){
2403
goto end;
2404
}
2405
2406
/* Run the main loop */
2407
2408
if(debug){
2409
fprintf_plus(stderr, "Starting Avahi loop search\n");
2410
}
2411
2412
ret = avahi_loop_with_timeout(simple_poll,
2413
(int)(retry_interval * 1000), &mc);
2414
if(debug){
2415
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2416
(ret == 0) ? "successfully" : "with error");
2417
}
2418
1079
2419
end:
1080
1081
if (debug){
1082
fprintf(stderr, "%s exiting\n", argv[0]);
1083
}
1084
1085
/* Cleanup things */
1086
if (sb != NULL)
1087
avahi_s_service_browser_free(sb);
1088
1089
if (mc.server != NULL)
1090
avahi_server_free(mc.server);
1091
1092
if (mc.simple_poll != NULL)
1093
avahi_simple_poll_free(mc.simple_poll);
1094
1095
if (gnutls_initalized){
1096
gnutls_certificate_free_credentials(mc.cred);
1097
gnutls_global_deinit ();
1098
gnutls_dh_params_deinit(mc.dh_params);
1099
}
1100
1101
if(gpgme_initalized){
1102
gpgme_release(mc.ctx);
1103
}
1104
1105
/* Removes the temp directory used by GPGME */
1106
if(tempdir[0] != '\0'){
1107
DIR *d;
1108
struct dirent *direntry;
1109
d = opendir(tempdir);
1110
if(d == NULL){
1111
perror("opendir");
1112
} else {
1113
while(true){
1114
direntry = readdir(d);
1115
if(direntry == NULL){
1116
break;
1117
}
1118
if (direntry->d_type == DT_REG){
1119
char *fullname = NULL;
1120
ret = asprintf(&fullname, "%s/%s", tempdir,
1121
direntry->d_name);
1122
if(ret < 0){
1123
perror("asprintf");
1124
continue;
1125
}
1126
ret = unlink(fullname);
1127
if(ret == -1){
1128
fprintf(stderr, "unlink(\"%s\"): %s",
1129
fullname, strerror(errno));
1130
}
1131
free(fullname);
1132
}
1133
}
1134
closedir(d);
1135
}
1136
ret = rmdir(tempdir);
1137
if(ret == -1){
1138
perror("rmdir");
1139
}
1140
}
1141
1142
return exitcode;
2420
2421
if(debug){
2422
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2423
}
2424
2425
/* Cleanup things */
2426
free(mc.interfaces);
2427
2428
if(sb != NULL)
2429
avahi_s_service_browser_free(sb);
2430
2431
if(mc.server != NULL)
2432
avahi_server_free(mc.server);
2433
2434
if(simple_poll != NULL)
2435
avahi_simple_poll_free(simple_poll);
2436
2437
if(gnutls_initialized){
2438
gnutls_certificate_free_credentials(mc.cred);
2439
gnutls_global_deinit();
2440
gnutls_dh_params_deinit(mc.dh_params);
2441
}
2442
2443
if(gpgme_initialized){
2444
gpgme_release(mc.ctx);
2445
}
2446
2447
/* Cleans up the circular linked list of Mandos servers the client
2448
has seen */
2449
if(mc.current_server != NULL){
2450
mc.current_server->prev->next = NULL;
2451
while(mc.current_server != NULL){
2452
server *next = mc.current_server->next;
2453
free(mc.current_server);
2454
mc.current_server = next;
2455
}
2456
}
2457
2458
/* Re-raise priviliges */
2459
{
2460
raise_privileges();
2461
2462
/* Run network hooks */
2463
run_network_hooks("stop", interfaces_hooks != NULL ?
2464
interfaces_hooks : "", delay);
2465
2466
/* Take down the network interfaces which were brought up */
2467
{
2468
char *interface = NULL;
2469
while((interface=argz_next(interfaces_to_take_down,
2470
interfaces_to_take_down_size,
2471
interface))){
2472
ret_errno = take_down_interface(interface);
2473
if(ret_errno != 0){
2474
errno = ret_errno;
2475
perror_plus("Failed to take down interface");
2476
}
2477
}
2478
if(debug and (interfaces_to_take_down == NULL)){
2479
fprintf_plus(stderr, "No interfaces needed to be taken"
2480
" down\n");
2481
}
2482
}
2483
2484
lower_privileges_permanently();
2485
}
2486
2487
free(interfaces_to_take_down);
2488
free(interfaces_hooks);
2489
2490
/* Removes the GPGME temp directory and all files inside */
2491
if(tempdir_created){
2492
struct dirent **direntries = NULL;
2493
struct dirent *direntry = NULL;
2494
int numentries = scandir(tempdir, &direntries, notdotentries,
2495
alphasort);
2496
if (numentries > 0){
2497
for(int i = 0; i < numentries; i++){
2498
direntry = direntries[i];
2499
char *fullname = NULL;
2500
ret = asprintf(&fullname, "%s/%s", tempdir,
2501
direntry->d_name);
2502
if(ret < 0){
2503
perror_plus("asprintf");
2504
continue;
2505
}
2506
ret = remove(fullname);
2507
if(ret == -1){
2508
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2509
strerror(errno));
2510
}
2511
free(fullname);
2512
}
2513
}
2514
2515
/* need to clean even if 0 because man page doesn't specify */
2516
free(direntries);
2517
if (numentries == -1){
2518
perror_plus("scandir");
2519
}
2520
ret = rmdir(tempdir);
2521
if(ret == -1 and errno != ENOENT){
2522
perror_plus("rmdir");
2523
}
2524
}
2525
2526
if(quit_now){
2527
sigemptyset(&old_sigterm_action.sa_mask);
2528
old_sigterm_action.sa_handler = SIG_DFL;
2529
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2530
&old_sigterm_action,
2531
NULL));
2532
if(ret == -1){
2533
perror_plus("sigaction");
2534
}
2535
do {
2536
ret = raise(signal_received);
2537
} while(ret != 0 and errno == EINTR);
2538
if(ret != 0){
2539
perror_plus("raise");
2540
abort();
2541
}
2542
TEMP_FAILURE_RETRY(pause());
2543
}
2544
2545
return exitcode;
1143
2546
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0