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- Committer: Teddy Hogeborn
- Date: 2008-10-01 15:29:01 UTC
- Revision ID: teddy@fukt.bsnet.se-20081001152901-fh30whl3m4vb7m24
* debian/changelog: New Debian revision.
* debian/mandos-client.lintian-overrides: Added comments.
* debian/mandos.lintian-overrides: - '' -
* debian/mandos-client.lintian-overrides: Added comments.
* debian/mandos.lintian-overrides: - '' -
- files added:
- debian/mandos-client.config
- files removed:
- DBUS-API
- debian/source
- debian/upstream
- network-hooks.d
- 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 © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 Björn Påhlsson
12
* Copyright © 2008 Teddy Hogeborn & Björn Påhlsson
14
13
*
15
14
* This program is free software: you can redistribute it and/or
16
15
* modify it under the terms of the GNU General Public License as
26
25
* along with this program. If not, see
27
26
* <http://www.gnu.org/licenses/>.
28
27
*
29
* Contact the authors at <mandos@recompile.se>.
28
* Contact the authors at <mandos@fukt.bsnet.se>.
30
29
*/
31
30
32
31
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
34
32
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
37
33
#define _FILE_OFFSET_BITS 64
38
#endif
39
34
40
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
36
42
37
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
38
stdout, ferror() */
39
#include <stdint.h> /* uint16_t, uint32_t */
45
40
#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 */
41
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
42
srand() */
43
#include <stdbool.h> /* bool, true */
49
44
#include <string.h> /* memset(), strcmp(), strlen(),
50
45
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
46
#include <sys/ioctl.h> /* ioctl */
52
47
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
48
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
49
SOCK_STREAM, INET6_ADDRSTRLEN,
50
uid_t, gid_t, open(), opendir(), DIR */
51
#include <sys/stat.h> /* open() */
57
52
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect(),
59
getnameinfo() */
53
struct in6_addr, inet_pton(),
54
connect() */
60
55
#include <fcntl.h> /* open() */
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() */
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() */
68
61
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
62
SIOCSIFFLAGS, if_indextoname(),
70
63
if_nametoindex(), IF_NAMESIZE */
71
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
*/
64
#include <netinet/in.h>
74
65
#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() */
78
#include <iso646.h> /* not, or, and */
66
getuid(), getgid(), setuid(),
67
setgid() */
68
#include <arpa/inet.h> /* inet_pton(), htons */
69
#include <iso646.h> /* not, and */
79
70
#include <argp.h> /* struct argp_option, error_t, struct
80
71
argp_state, struct argp,
81
72
argp_parse(), ARGP_KEY_ARG,
82
73
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__ */
101
74
102
75
/* Avahi */
103
76
/* All Avahi types, constants and functions
116
89
gnutls_*
117
90
init_gnutls_session(),
118
91
GNUTLS_* */
119
#include <gnutls/openpgp.h>
120
/* gnutls_certificate_set_openpgp_key_file(),
121
GNUTLS_OPENPGP_FMT_BASE64 */
92
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
93
GNUTLS_OPENPGP_FMT_BASE64 */
122
94
123
95
/* GPGME */
124
96
#include <gpgme.h> /* All GPGME types, constants and
132
104
#define PATHDIR "/conf/conf.d/mandos"
133
105
#define SECKEY "seckey.txt"
134
106
#define PUBKEY "pubkey.txt"
135
#define HOOKDIR "/lib/mandos/network-hooks.d"
136
107
137
108
bool debug = false;
138
109
static const char mandos_protocol_version[] = "1";
139
110
const char *argp_program_version = "mandos-client " VERSION;
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;
111
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
157
112
158
113
/* Used for passing in values through the Avahi callback functions */
159
114
typedef struct {
115
AvahiSimplePoll *simple_poll;
160
116
AvahiServer *server;
161
117
gnutls_certificate_credentials_t cred;
162
118
unsigned int dh_bits;
163
119
gnutls_dh_params_t dh_params;
164
120
const char *priority;
165
121
gpgme_ctx_t ctx;
166
server *current_server;
167
char *interfaces;
168
size_t interfaces_size;
169
122
} mandos_context;
170
123
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), nonnull))
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
196
124
/*
197
* Make additional room in "buffer" for at least BUFFER_SIZE more
198
* bytes. "buffer_capacity" is how much is currently allocated,
125
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
126
* "buffer_capacity" is how much is currently allocated,
199
127
* "buffer_length" is how much is already used.
200
128
*/
201
__attribute__((nonnull, warn_unused_result))
202
size_t incbuffer(char **buffer, size_t buffer_length,
203
size_t buffer_capacity){
204
if(buffer_length + BUFFER_SIZE > buffer_capacity){
205
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
206
if(new_buf == NULL){
207
int old_errno = errno;
208
free(*buffer);
209
errno = old_errno;
210
*buffer = NULL;
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){
211
134
return 0;
212
135
}
213
*buffer = new_buf;
214
136
buffer_capacity += BUFFER_SIZE;
215
137
}
216
138
return buffer_capacity;
217
139
}
218
140
219
/* Add server to set of servers to retry periodically */
220
__attribute__((nonnull, warn_unused_result))
221
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
222
int af, server **current_server){
223
int ret;
224
server *new_server = malloc(sizeof(server));
225
if(new_server == NULL){
226
perror_plus("malloc");
227
return false;
228
}
229
*new_server = (server){ .ip = strdup(ip),
230
.port = port,
231
.if_index = if_index,
232
.af = af };
233
if(new_server->ip == NULL){
234
perror_plus("strdup");
235
return false;
236
}
237
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
238
if(ret == -1){
239
perror_plus("clock_gettime");
240
return false;
241
}
242
/* Special case of first server */
243
if(*current_server == NULL){
244
new_server->next = new_server;
245
new_server->prev = new_server;
246
*current_server = new_server;
247
} else {
248
/* Place the new server last in the list */
249
new_server->next = *current_server;
250
new_server->prev = (*current_server)->prev;
251
new_server->prev->next = new_server;
252
(*current_server)->prev = new_server;
253
}
254
return true;
255
}
256
257
141
/*
258
142
* Initialize GPGME.
259
143
*/
260
__attribute__((nonnull, warn_unused_result))
261
static bool init_gpgme(const char * const seckey,
262
const char * const pubkey,
263
const char * const tempdir,
264
mandos_context *mc){
144
static bool init_gpgme(mandos_context *mc, const char *seckey,
145
const char *pubkey, const char *tempdir){
146
int ret;
265
147
gpgme_error_t rc;
266
148
gpgme_engine_info_t engine_info;
267
149
150
268
151
/*
269
* Helper function to insert pub and seckey to the engine keyring.
152
* Helper function to insert pub and seckey to the enigne keyring.
270
153
*/
271
bool import_key(const char * const filename){
272
int ret;
154
bool import_key(const char *filename){
273
155
int fd;
274
156
gpgme_data_t pgp_data;
275
157
276
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
158
fd = TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
277
159
if(fd == -1){
278
perror_plus("open");
160
perror("open");
279
161
return false;
280
162
}
281
163
282
164
rc = gpgme_data_new_from_fd(&pgp_data, fd);
283
if(rc != GPG_ERR_NO_ERROR){
284
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
285
gpgme_strsource(rc), gpgme_strerror(rc));
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));
286
168
return false;
287
169
}
288
170
289
171
rc = gpgme_op_import(mc->ctx, pgp_data);
290
if(rc != GPG_ERR_NO_ERROR){
291
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
292
gpgme_strsource(rc), gpgme_strerror(rc));
172
if (rc != GPG_ERR_NO_ERROR){
173
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
174
gpgme_strsource(rc), gpgme_strerror(rc));
293
175
return false;
294
176
}
295
177
296
ret = (int)TEMP_FAILURE_RETRY(close(fd));
178
ret = TEMP_FAILURE_RETRY(close(fd));
297
179
if(ret == -1){
298
perror_plus("close");
180
perror("close");
299
181
}
300
182
gpgme_data_release(pgp_data);
301
183
return true;
302
184
}
303
185
304
if(debug){
305
fprintf_plus(stderr, "Initializing GPGME\n");
186
if (debug){
187
fprintf(stderr, "Initialize gpgme\n");
306
188
}
307
189
308
190
/* Init GPGME */
309
191
gpgme_check_version(NULL);
310
192
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
311
if(rc != GPG_ERR_NO_ERROR){
312
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
313
gpgme_strsource(rc), gpgme_strerror(rc));
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));
314
196
return false;
315
197
}
316
198
317
/* Set GPGME home directory for the OpenPGP engine only */
318
rc = gpgme_get_engine_info(&engine_info);
319
if(rc != GPG_ERR_NO_ERROR){
320
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
321
gpgme_strsource(rc), gpgme_strerror(rc));
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));
322
204
return false;
323
205
}
324
206
while(engine_info != NULL){
330
212
engine_info = engine_info->next;
331
213
}
332
214
if(engine_info == NULL){
333
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
334
tempdir);
215
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
335
216
return false;
336
217
}
337
218
338
219
/* Create new GPGME "context" */
339
220
rc = gpgme_new(&(mc->ctx));
340
if(rc != GPG_ERR_NO_ERROR){
341
fprintf_plus(stderr, "Mandos plugin mandos-client: "
342
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
343
gpgme_strerror(rc));
344
return false;
345
}
346
347
if(not import_key(pubkey) or not import_key(seckey)){
348
return false;
349
}
350
351
return true;
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;
352
232
}
353
233
354
234
/*
355
235
* Decrypt OpenPGP data.
356
236
* Returns -1 on error
357
237
*/
358
__attribute__((nonnull, warn_unused_result))
359
static ssize_t pgp_packet_decrypt(const char *cryptotext,
360
size_t crypto_size,
361
char **plaintext,
362
mandos_context *mc){
238
static ssize_t pgp_packet_decrypt (const mandos_context *mc,
239
const char *cryptotext,
240
size_t crypto_size,
241
char **plaintext){
363
242
gpgme_data_t dh_crypto, dh_plain;
364
243
gpgme_error_t rc;
365
244
ssize_t ret;
366
245
size_t plaintext_capacity = 0;
367
246
ssize_t plaintext_length = 0;
368
247
369
if(debug){
370
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
248
if (debug){
249
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
371
250
}
372
251
373
252
/* Create new GPGME data buffer from memory cryptotext */
374
253
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
375
254
0);
376
if(rc != GPG_ERR_NO_ERROR){
377
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
378
gpgme_strsource(rc), gpgme_strerror(rc));
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));
379
258
return -1;
380
259
}
381
260
382
261
/* Create new empty GPGME data buffer for the plaintext */
383
262
rc = gpgme_data_new(&dh_plain);
384
if(rc != GPG_ERR_NO_ERROR){
385
fprintf_plus(stderr, "Mandos plugin mandos-client: "
386
"bad gpgme_data_new: %s: %s\n",
387
gpgme_strsource(rc), gpgme_strerror(rc));
263
if (rc != GPG_ERR_NO_ERROR){
264
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
265
gpgme_strsource(rc), gpgme_strerror(rc));
388
266
gpgme_data_release(dh_crypto);
389
267
return -1;
390
268
}
392
270
/* Decrypt data from the cryptotext data buffer to the plaintext
393
271
data buffer */
394
272
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
395
if(rc != GPG_ERR_NO_ERROR){
396
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
397
gpgme_strsource(rc), gpgme_strerror(rc));
273
if (rc != GPG_ERR_NO_ERROR){
274
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
275
gpgme_strsource(rc), gpgme_strerror(rc));
398
276
plaintext_length = -1;
399
if(debug){
277
if (debug){
400
278
gpgme_decrypt_result_t result;
401
279
result = gpgme_op_decrypt_result(mc->ctx);
402
if(result == NULL){
403
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
280
if (result == NULL){
281
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
404
282
} else {
405
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
406
result->unsupported_algorithm);
407
fprintf_plus(stderr, "Wrong key usage: %u\n",
408
result->wrong_key_usage);
283
fprintf(stderr, "Unsupported algorithm: %s\n",
284
result->unsupported_algorithm);
285
fprintf(stderr, "Wrong key usage: %u\n",
286
result->wrong_key_usage);
409
287
if(result->file_name != NULL){
410
fprintf_plus(stderr, "File name: %s\n", result->file_name);
288
fprintf(stderr, "File name: %s\n", result->file_name);
411
289
}
412
290
gpgme_recipient_t recipient;
413
291
recipient = result->recipients;
414
while(recipient != NULL){
415
fprintf_plus(stderr, "Public key algorithm: %s\n",
416
gpgme_pubkey_algo_name
417
(recipient->pubkey_algo));
418
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
419
fprintf_plus(stderr, "Secret key available: %s\n",
420
recipient->status == GPG_ERR_NO_SECKEY
421
? "No" : "Yes");
422
recipient = recipient->next;
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
}
423
302
}
424
303
}
425
304
}
427
306
}
428
307
429
308
if(debug){
430
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
309
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
431
310
}
432
311
433
312
/* Seek back to the beginning of the GPGME plaintext data buffer */
434
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
435
perror_plus("gpgme_data_seek");
313
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
314
perror("gpgme_data_seek");
436
315
plaintext_length = -1;
437
316
goto decrypt_end;
438
317
}
439
318
440
319
*plaintext = NULL;
441
320
while(true){
442
plaintext_capacity = incbuffer(plaintext,
443
(size_t)plaintext_length,
444
plaintext_capacity);
445
if(plaintext_capacity == 0){
446
perror_plus("incbuffer");
447
plaintext_length = -1;
448
goto decrypt_end;
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;
449
328
}
450
329
451
330
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
452
331
BUFFER_SIZE);
453
332
/* Print the data, if any */
454
if(ret == 0){
333
if (ret == 0){
455
334
/* EOF */
456
335
break;
457
336
}
458
337
if(ret < 0){
459
perror_plus("gpgme_data_read");
338
perror("gpgme_data_read");
460
339
plaintext_length = -1;
461
340
goto decrypt_end;
462
341
}
464
343
}
465
344
466
345
if(debug){
467
fprintf_plus(stderr, "Decrypted password is: ");
346
fprintf(stderr, "Decrypted password is: ");
468
347
for(ssize_t i = 0; i < plaintext_length; i++){
469
348
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
470
349
}
481
360
return plaintext_length;
482
361
}
483
362
484
__attribute__((warn_unused_result))
485
static const char *safer_gnutls_strerror(int value){
486
const char *ret = gnutls_strerror(value);
487
if(ret == NULL)
363
static const char * safer_gnutls_strerror (int value) {
364
const char *ret = gnutls_strerror (value); /* Spurious warning */
365
if (ret == NULL)
488
366
ret = "(unknown)";
489
367
return ret;
490
368
}
491
369
492
370
/* GnuTLS log function callback */
493
__attribute__((nonnull))
494
371
static void debuggnutls(__attribute__((unused)) int level,
495
372
const char* string){
496
fprintf_plus(stderr, "GnuTLS: %s", string);
373
fprintf(stderr, "GnuTLS: %s", string);
497
374
}
498
375
499
__attribute__((nonnull, warn_unused_result))
500
static int init_gnutls_global(const char *pubkeyfilename,
501
const char *seckeyfilename,
502
mandos_context *mc){
376
static int init_gnutls_global(mandos_context *mc,
377
const char *pubkeyfilename,
378
const char *seckeyfilename){
503
379
int ret;
504
380
505
381
if(debug){
506
fprintf_plus(stderr, "Initializing GnuTLS\n");
382
fprintf(stderr, "Initializing GnuTLS\n");
507
383
}
508
384
509
385
ret = gnutls_global_init();
510
if(ret != GNUTLS_E_SUCCESS){
511
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
512
safer_gnutls_strerror(ret));
386
if (ret != GNUTLS_E_SUCCESS) {
387
fprintf (stderr, "GnuTLS global_init: %s\n",
388
safer_gnutls_strerror(ret));
513
389
return -1;
514
390
}
515
391
516
if(debug){
392
if (debug){
517
393
/* "Use a log level over 10 to enable all debugging options."
518
394
* - GnuTLS manual
519
395
*/
522
398
}
523
399
524
400
/* OpenPGP credentials */
525
ret = gnutls_certificate_allocate_credentials(&mc->cred);
526
if(ret != GNUTLS_E_SUCCESS){
527
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
528
safer_gnutls_strerror(ret));
529
gnutls_global_deinit();
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 ();
530
407
return -1;
531
408
}
532
409
533
410
if(debug){
534
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
535
" secret key %s as GnuTLS credentials\n",
536
pubkeyfilename,
537
seckeyfilename);
411
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
412
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
413
seckeyfilename);
538
414
}
539
415
540
416
ret = gnutls_certificate_set_openpgp_key_file
541
417
(mc->cred, pubkeyfilename, seckeyfilename,
542
418
GNUTLS_OPENPGP_FMT_BASE64);
543
if(ret != GNUTLS_E_SUCCESS){
544
fprintf_plus(stderr,
545
"Error[%d] while reading the OpenPGP key pair ('%s',"
546
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
547
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
548
safer_gnutls_strerror(ret));
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));
549
425
goto globalfail;
550
426
}
551
427
552
428
/* GnuTLS server initialization */
553
429
ret = gnutls_dh_params_init(&mc->dh_params);
554
if(ret != GNUTLS_E_SUCCESS){
555
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
556
" initialization: %s\n",
557
safer_gnutls_strerror(ret));
430
if (ret != GNUTLS_E_SUCCESS) {
431
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
432
" %s\n", safer_gnutls_strerror(ret));
558
433
goto globalfail;
559
434
}
560
435
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
561
if(ret != GNUTLS_E_SUCCESS){
562
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
563
safer_gnutls_strerror(ret));
436
if (ret != GNUTLS_E_SUCCESS) {
437
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
438
safer_gnutls_strerror(ret));
564
439
goto globalfail;
565
440
}
566
441
576
451
return -1;
577
452
}
578
453
579
__attribute__((nonnull, warn_unused_result))
580
static int init_gnutls_session(gnutls_session_t *session,
581
mandos_context *mc){
454
static int init_gnutls_session(mandos_context *mc,
455
gnutls_session_t *session){
582
456
int ret;
583
457
/* GnuTLS session creation */
584
do {
585
ret = gnutls_init(session, GNUTLS_SERVER);
586
if(quit_now){
587
return -1;
588
}
589
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
590
if(ret != GNUTLS_E_SUCCESS){
591
fprintf_plus(stderr,
592
"Error in GnuTLS session initialization: %s\n",
593
safer_gnutls_strerror(ret));
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));
594
462
}
595
463
596
464
{
597
465
const char *err;
598
do {
599
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
600
if(quit_now){
601
gnutls_deinit(*session);
602
return -1;
603
}
604
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
605
if(ret != GNUTLS_E_SUCCESS){
606
fprintf_plus(stderr, "Syntax error at: %s\n", err);
607
fprintf_plus(stderr, "GnuTLS error: %s\n",
608
safer_gnutls_strerror(ret));
609
gnutls_deinit(*session);
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);
610
472
return -1;
611
473
}
612
474
}
613
475
614
do {
615
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
616
mc->cred);
617
if(quit_now){
618
gnutls_deinit(*session);
619
return -1;
620
}
621
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
622
if(ret != GNUTLS_E_SUCCESS){
623
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
624
safer_gnutls_strerror(ret));
625
gnutls_deinit(*session);
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);
626
482
return -1;
627
483
}
628
484
629
485
/* ignore client certificate if any. */
630
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
486
gnutls_certificate_server_set_request (*session,
487
GNUTLS_CERT_IGNORE);
631
488
632
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
489
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
633
490
634
491
return 0;
635
492
}
639
496
__attribute__((unused)) const char *txt){}
640
497
641
498
/* Called when a Mandos server is found */
642
__attribute__((nonnull, warn_unused_result))
643
static int start_mandos_communication(const char *ip, in_port_t port,
499
static int start_mandos_communication(const char *ip, uint16_t port,
644
500
AvahiIfIndex if_index,
645
int af, mandos_context *mc){
646
int ret, tcp_sd = -1;
647
ssize_t sret;
648
struct sockaddr_storage to;
501
mandos_context *mc){
502
int ret, tcp_sd;
503
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
649
504
char *buffer = NULL;
650
char *decrypted_buffer = NULL;
505
char *decrypted_buffer;
651
506
size_t buffer_length = 0;
652
507
size_t buffer_capacity = 0;
508
ssize_t decrypted_buffer_size;
653
509
size_t written;
654
int retval = -1;
510
int retval = 0;
511
char interface[IF_NAMESIZE];
655
512
gnutls_session_t session;
656
int pf; /* Protocol family */
657
658
errno = 0;
659
660
if(quit_now){
661
errno = EINTR;
662
return -1;
663
}
664
665
switch(af){
666
case AF_INET6:
667
pf = PF_INET6;
668
break;
669
case AF_INET:
670
pf = PF_INET;
671
break;
672
default:
673
fprintf_plus(stderr, "Bad address family: %d\n", af);
674
errno = EINVAL;
675
return -1;
676
}
677
678
/* If the interface is specified and we have a list of interfaces */
679
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
680
/* Check if the interface is one of the interfaces we are using */
681
bool match = false;
682
{
683
char *interface = NULL;
684
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
685
interface))){
686
if(if_nametoindex(interface) == (unsigned int)if_index){
687
match = true;
688
break;
689
}
690
}
691
}
692
if(not match){
693
/* This interface does not match any in the list, so we don't
694
connect to the server */
695
if(debug){
696
char interface[IF_NAMESIZE];
697
if(if_indextoname((unsigned int)if_index, interface) == NULL){
698
perror_plus("if_indextoname");
699
} else {
700
fprintf_plus(stderr, "Skipping server on non-used interface"
701
" \"%s\"\n",
702
if_indextoname((unsigned int)if_index,
703
interface));
704
}
705
}
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");
706
533
return -1;
707
534
}
708
}
709
710
ret = init_gnutls_session(&session, mc);
711
if(ret != 0){
712
return -1;
713
}
714
715
if(debug){
716
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
717
PRIuMAX "\n", ip, (uintmax_t)port);
718
}
719
720
tcp_sd = socket(pf, SOCK_STREAM, 0);
721
if(tcp_sd < 0){
722
int e = errno;
723
perror_plus("socket");
724
errno = e;
725
goto mandos_end;
726
}
727
728
if(quit_now){
729
errno = EINTR;
730
goto mandos_end;
535
fprintf(stderr, "Binding to interface %s\n", interface);
731
536
}
732
537
733
538
memset(&to, 0, sizeof(to));
734
if(af == AF_INET6){
735
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
736
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
737
} else { /* IPv4 */
738
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
739
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
740
}
741
if(ret < 0 ){
742
int e = errno;
743
perror_plus("inet_pton");
744
errno = e;
745
goto mandos_end;
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;
746
546
}
747
547
if(ret == 0){
748
int e = errno;
749
fprintf_plus(stderr, "Bad address: %s\n", ip);
750
errno = e;
751
goto mandos_end;
752
}
753
if(af == AF_INET6){
754
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
755
if(IN6_IS_ADDR_LINKLOCAL
756
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
757
if(if_index == AVAHI_IF_UNSPEC){
758
fprintf_plus(stderr, "An IPv6 link-local address is"
759
" incomplete without a network interface\n");
760
errno = EINVAL;
761
goto mandos_end;
762
}
763
/* Set the network interface number as scope */
764
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
765
}
766
} else {
767
((struct sockaddr_in *)&to)->sin_port = htons(port);
768
}
548
fprintf(stderr, "Bad address: %s\n", ip);
549
return -1;
550
}
551
to.in6.sin6_port = htons(port); /* Spurious warning */
769
552
770
if(quit_now){
771
errno = EINTR;
772
goto mandos_end;
773
}
553
to.in6.sin6_scope_id = (uint32_t)if_index;
774
554
775
555
if(debug){
776
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
777
char interface[IF_NAMESIZE];
778
if(if_indextoname((unsigned int)if_index, interface) == NULL){
779
perror_plus("if_indextoname");
780
} else {
781
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
782
"\n", ip, interface, (uintmax_t)port);
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);
783
565
}
784
} else {
785
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
786
ip, (uintmax_t)port);
787
}
788
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
789
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
790
if(af == AF_INET6){
791
ret = getnameinfo((struct sockaddr *)&to,
792
sizeof(struct sockaddr_in6),
793
addrstr, sizeof(addrstr), NULL, 0,
794
NI_NUMERICHOST);
795
} else {
796
ret = getnameinfo((struct sockaddr *)&to,
797
sizeof(struct sockaddr_in),
798
addrstr, sizeof(addrstr), NULL, 0,
799
NI_NUMERICHOST);
800
}
801
if(ret == EAI_SYSTEM){
802
perror_plus("getnameinfo");
803
} else if(ret != 0) {
804
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
805
} else if(strcmp(addrstr, ip) != 0){
806
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
807
}
808
}
809
810
if(quit_now){
811
errno = EINTR;
812
goto mandos_end;
813
}
814
815
if(af == AF_INET6){
816
ret = connect(tcp_sd, (struct sockaddr *)&to,
817
sizeof(struct sockaddr_in6));
818
} else {
819
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
820
sizeof(struct sockaddr_in));
821
}
822
if(ret < 0){
823
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
824
int e = errno;
825
perror_plus("connect");
826
errno = e;
827
}
828
goto mandos_end;
829
}
830
831
if(quit_now){
832
errno = EINTR;
833
goto mandos_end;
566
}
567
}
568
569
ret = connect(tcp_sd, &to.in, sizeof(to));
570
if (ret < 0){
571
perror("connect");
572
return -1;
834
573
}
835
574
836
575
const char *out = mandos_protocol_version;
837
576
written = 0;
838
while(true){
577
while (true){
839
578
size_t out_size = strlen(out);
840
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
841
out_size - written));
842
if(ret == -1){
843
int e = errno;
844
perror_plus("write");
845
errno = e;
579
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
580
out_size - written));
581
if (ret == -1){
582
perror("write");
583
retval = -1;
846
584
goto mandos_end;
847
585
}
848
586
written += (size_t)ret;
849
587
if(written < out_size){
850
588
continue;
851
589
} else {
852
if(out == mandos_protocol_version){
590
if (out == mandos_protocol_version){
853
591
written = 0;
854
592
out = "\r\n";
855
593
} else {
856
594
break;
857
595
}
858
596
}
859
860
if(quit_now){
861
errno = EINTR;
862
goto mandos_end;
863
}
864
597
}
865
598
866
599
if(debug){
867
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
868
}
869
870
if(quit_now){
871
errno = EINTR;
872
goto mandos_end;
873
}
874
875
/* This casting via intptr_t is to eliminate warning about casting
876
an int to a pointer type. This is exactly how the GnuTLS Guile
877
function "set-session-transport-fd!" does it. */
878
gnutls_transport_set_ptr(session,
879
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
880
881
if(quit_now){
882
errno = EINTR;
883
goto mandos_end;
884
}
885
886
do {
887
ret = gnutls_handshake(session);
888
if(quit_now){
889
errno = EINTR;
890
goto mandos_end;
891
}
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);
892
607
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
893
608
894
if(ret != GNUTLS_E_SUCCESS){
609
if (ret != GNUTLS_E_SUCCESS){
895
610
if(debug){
896
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
897
gnutls_perror(ret);
611
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
612
gnutls_perror (ret);
898
613
}
899
errno = EPROTO;
614
retval = -1;
900
615
goto mandos_end;
901
616
}
902
617
903
618
/* Read OpenPGP packet that contains the wanted password */
904
619
905
620
if(debug){
906
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
907
" %s\n", ip);
621
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
622
ip);
908
623
}
909
624
910
625
while(true){
911
912
if(quit_now){
913
errno = EINTR;
914
goto mandos_end;
915
}
916
917
buffer_capacity = incbuffer(&buffer, buffer_length,
918
buffer_capacity);
919
if(buffer_capacity == 0){
920
int e = errno;
921
perror_plus("incbuffer");
922
errno = e;
923
goto mandos_end;
924
}
925
926
if(quit_now){
927
errno = EINTR;
928
goto mandos_end;
929
}
930
931
sret = gnutls_record_recv(session, buffer+buffer_length,
932
BUFFER_SIZE);
933
if(sret == 0){
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){
934
637
break;
935
638
}
936
if(sret < 0){
937
switch(sret){
639
if (ret < 0){
640
switch(ret){
938
641
case GNUTLS_E_INTERRUPTED:
939
642
case GNUTLS_E_AGAIN:
940
643
break;
941
644
case GNUTLS_E_REHANDSHAKE:
942
do {
943
ret = gnutls_handshake(session);
944
945
if(quit_now){
946
errno = EINTR;
947
goto mandos_end;
948
}
645
do{
646
ret = gnutls_handshake (session);
949
647
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
950
if(ret < 0){
951
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
952
"***\n");
953
gnutls_perror(ret);
954
errno = EPROTO;
648
if (ret < 0){
649
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
650
gnutls_perror (ret);
651
retval = -1;
955
652
goto mandos_end;
956
653
}
957
654
break;
958
655
default:
959
fprintf_plus(stderr, "Unknown error while reading data from"
960
" encrypted session with Mandos server\n");
961
gnutls_bye(session, GNUTLS_SHUT_RDWR);
962
errno = EIO;
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);
963
660
goto mandos_end;
964
661
}
965
662
} else {
966
buffer_length += (size_t) sret;
663
buffer_length += (size_t) ret;
967
664
}
968
665
}
969
666
970
667
if(debug){
971
fprintf_plus(stderr, "Closing TLS session\n");
972
}
973
974
if(quit_now){
975
errno = EINTR;
976
goto mandos_end;
977
}
978
979
do {
980
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
981
if(quit_now){
982
errno = EINTR;
983
goto mandos_end;
984
}
985
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
986
987
if(buffer_length > 0){
988
ssize_t decrypted_buffer_size;
989
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
990
&decrypted_buffer, mc);
991
if(decrypted_buffer_size >= 0){
992
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){
993
678
written = 0;
994
679
while(written < (size_t) decrypted_buffer_size){
995
if(quit_now){
996
errno = EINTR;
997
goto mandos_end;
998
}
999
1000
ret = (int)fwrite(decrypted_buffer + written, 1,
1001
(size_t)decrypted_buffer_size - written,
1002
stdout);
680
ret = (int)fwrite (decrypted_buffer + written, 1,
681
(size_t)decrypted_buffer_size - written,
682
stdout);
1003
683
if(ret == 0 and ferror(stdout)){
1004
int e = errno;
1005
684
if(debug){
1006
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1007
strerror(errno));
685
fprintf(stderr, "Error writing encrypted data: %s\n",
686
strerror(errno));
1008
687
}
1009
errno = e;
1010
goto mandos_end;
688
retval = -1;
689
break;
1011
690
}
1012
691
written += (size_t)ret;
1013
692
}
1014
retval = 0;
693
free(decrypted_buffer);
694
} else {
695
retval = -1;
1015
696
}
697
} else {
698
retval = -1;
1016
699
}
1017
700
1018
701
/* Shutdown procedure */
1019
702
1020
703
mandos_end:
1021
{
1022
int e = errno;
1023
free(decrypted_buffer);
1024
free(buffer);
1025
if(tcp_sd >= 0){
1026
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1027
}
1028
if(ret == -1){
1029
if(e == 0){
1030
e = errno;
1031
}
1032
perror_plus("close");
1033
}
1034
gnutls_deinit(session);
1035
errno = e;
1036
if(quit_now){
1037
errno = EINTR;
1038
retval = -1;
1039
}
704
free(buffer);
705
ret = TEMP_FAILURE_RETRY(close(tcp_sd));
706
if(ret == -1){
707
perror("close");
1040
708
}
709
gnutls_deinit (session);
1041
710
return retval;
1042
711
}
1043
712
1044
__attribute__((nonnull))
1045
713
static void resolve_callback(AvahiSServiceResolver *r,
1046
714
AvahiIfIndex interface,
1047
AvahiProtocol proto,
715
AVAHI_GCC_UNUSED AvahiProtocol protocol,
1048
716
AvahiResolverEvent event,
1049
717
const char *name,
1050
718
const char *type,
1055
723
AVAHI_GCC_UNUSED AvahiStringList *txt,
1056
724
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1057
725
flags,
1058
void *mc){
1059
if(r == NULL){
1060
return;
1061
}
726
void* userdata) {
727
mandos_context *mc = userdata;
728
assert(r);
1062
729
1063
730
/* Called whenever a service has been resolved successfully or
1064
731
timed out */
1065
732
1066
if(quit_now){
1067
return;
1068
}
1069
1070
switch(event){
733
switch (event) {
1071
734
default:
1072
735
case AVAHI_RESOLVER_FAILURE:
1073
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1074
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1075
domain,
1076
avahi_strerror(avahi_server_errno
1077
(((mandos_context*)mc)->server)));
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)));
1078
739
break;
1079
740
1080
741
case AVAHI_RESOLVER_FOUND:
1082
743
char ip[AVAHI_ADDRESS_STR_MAX];
1083
744
avahi_address_snprint(ip, sizeof(ip), address);
1084
745
if(debug){
1085
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1086
PRIdMAX ") on port %" PRIu16 "\n", name,
1087
host_name, ip, (intmax_t)interface, port);
746
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
747
PRIu16 ") on port %d\n", name, host_name, ip,
748
interface, port);
1088
749
}
1089
int ret = start_mandos_communication(ip, (in_port_t)port,
1090
interface,
1091
avahi_proto_to_af(proto),
1092
mc);
1093
if(ret == 0){
1094
avahi_simple_poll_quit(simple_poll);
1095
} else {
1096
if(not add_server(ip, (in_port_t)port, interface,
1097
avahi_proto_to_af(proto),
1098
&((mandos_context*)mc)->current_server)){
1099
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1100
" list\n", name);
1101
}
750
int ret = start_mandos_communication(ip, port, interface, mc);
751
if (ret == 0){
752
avahi_simple_poll_quit(mc->simple_poll);
1102
753
}
1103
754
}
1104
755
}
1105
756
avahi_s_service_resolver_free(r);
1106
757
}
1107
758
1108
static void browse_callback(AvahiSServiceBrowser *b,
1109
AvahiIfIndex interface,
1110
AvahiProtocol protocol,
1111
AvahiBrowserEvent event,
1112
const char *name,
1113
const char *type,
1114
const char *domain,
1115
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1116
flags,
1117
void *mc){
1118
if(b == NULL){
1119
return;
1120
}
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);
1121
771
1122
772
/* Called whenever a new services becomes available on the LAN or
1123
773
is removed from the LAN */
1124
774
1125
if(quit_now){
1126
return;
1127
}
1128
1129
switch(event){
775
switch (event) {
1130
776
default:
1131
777
case AVAHI_BROWSER_FAILURE:
1132
778
1133
fprintf_plus(stderr, "(Avahi browser) %s\n",
1134
avahi_strerror(avahi_server_errno
1135
(((mandos_context*)mc)->server)));
1136
avahi_simple_poll_quit(simple_poll);
779
fprintf(stderr, "(Avahi browser) %s\n",
780
avahi_strerror(avahi_server_errno(mc->server)));
781
avahi_simple_poll_quit(mc->simple_poll);
1137
782
return;
1138
783
1139
784
case AVAHI_BROWSER_NEW:
1142
787
the callback function is called the Avahi server will free the
1143
788
resolver for us. */
1144
789
1145
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1146
interface, protocol, name, type,
1147
domain, protocol, 0,
1148
resolve_callback, mc) == NULL)
1149
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1150
" %s\n", name,
1151
avahi_strerror(avahi_server_errno
1152
(((mandos_context*)mc)->server)));
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)));
1153
796
break;
1154
797
1155
798
case AVAHI_BROWSER_REMOVE:
1158
801
case AVAHI_BROWSER_ALL_FOR_NOW:
1159
802
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1160
803
if(debug){
1161
fprintf_plus(stderr, "No Mandos server found, still"
1162
" searching...\n");
804
fprintf(stderr, "No Mandos server found, still searching...\n");
1163
805
}
1164
806
break;
1165
807
}
1166
808
}
1167
809
1168
/* Signal handler that stops main loop after SIGTERM */
1169
static void handle_sigterm(int sig){
1170
if(quit_now){
1171
return;
1172
}
1173
quit_now = 1;
1174
signal_received = sig;
1175
int old_errno = errno;
1176
/* set main loop to exit */
1177
if(simple_poll != NULL){
1178
avahi_simple_poll_quit(simple_poll);
1179
}
1180
errno = old_errno;
1181
}
1182
1183
__attribute__((nonnull, warn_unused_result))
1184
bool get_flags(const char *ifname, struct ifreq *ifr){
1185
int ret;
1186
error_t ret_errno;
1187
1188
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1189
if(s < 0){
1190
ret_errno = errno;
1191
perror_plus("socket");
1192
errno = ret_errno;
1193
return false;
1194
}
1195
strcpy(ifr->ifr_name, ifname);
1196
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1197
if(ret == -1){
1198
if(debug){
1199
ret_errno = errno;
1200
perror_plus("ioctl SIOCGIFFLAGS");
1201
errno = ret_errno;
1202
}
1203
return false;
1204
}
1205
return true;
1206
}
1207
1208
__attribute__((nonnull, warn_unused_result))
1209
bool good_flags(const char *ifname, const struct ifreq *ifr){
1210
1211
/* Reject the loopback device */
1212
if(ifr->ifr_flags & IFF_LOOPBACK){
1213
if(debug){
1214
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1215
ifname);
1216
}
1217
return false;
1218
}
1219
/* Accept point-to-point devices only if connect_to is specified */
1220
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1221
if(debug){
1222
fprintf_plus(stderr, "Accepting point-to-point interface"
1223
" \"%s\"\n", ifname);
1224
}
1225
return true;
1226
}
1227
/* Otherwise, reject non-broadcast-capable devices */
1228
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1229
if(debug){
1230
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1231
" \"%s\"\n", ifname);
1232
}
1233
return false;
1234
}
1235
/* Reject non-ARP interfaces (including dummy interfaces) */
1236
if(ifr->ifr_flags & IFF_NOARP){
1237
if(debug){
1238
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1239
ifname);
1240
}
1241
return false;
1242
}
1243
1244
/* Accept this device */
1245
if(debug){
1246
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1247
}
1248
return true;
1249
}
1250
1251
/*
1252
* This function determines if a directory entry in /sys/class/net
1253
* corresponds to an acceptable network device.
1254
* (This function is passed to scandir(3) as a filter function.)
1255
*/
1256
__attribute__((nonnull, warn_unused_result))
1257
int good_interface(const struct dirent *if_entry){
1258
if(if_entry->d_name[0] == '.'){
1259
return 0;
1260
}
1261
1262
struct ifreq ifr;
1263
if(not get_flags(if_entry->d_name, &ifr)){
1264
if(debug){
1265
fprintf_plus(stderr, "Failed to get flags for interface "
1266
"\"%s\"\n", if_entry->d_name);
1267
}
1268
return 0;
1269
}
1270
1271
if(not good_flags(if_entry->d_name, &ifr)){
1272
return 0;
1273
}
1274
return 1;
1275
}
1276
1277
/*
1278
* This function determines if a network interface is up.
1279
*/
1280
__attribute__((nonnull, warn_unused_result))
1281
bool interface_is_up(const char *interface){
1282
struct ifreq ifr;
1283
if(not get_flags(interface, &ifr)){
1284
if(debug){
1285
fprintf_plus(stderr, "Failed to get flags for interface "
1286
"\"%s\"\n", interface);
1287
}
1288
return false;
1289
}
1290
1291
return (bool)(ifr.ifr_flags & IFF_UP);
1292
}
1293
1294
/*
1295
* This function determines if a network interface is running
1296
*/
1297
__attribute__((nonnull, warn_unused_result))
1298
bool interface_is_running(const char *interface){
1299
struct ifreq ifr;
1300
if(not get_flags(interface, &ifr)){
1301
if(debug){
1302
fprintf_plus(stderr, "Failed to get flags for interface "
1303
"\"%s\"\n", interface);
1304
}
1305
return false;
1306
}
1307
1308
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1309
}
1310
1311
__attribute__((nonnull, pure, warn_unused_result))
1312
int notdotentries(const struct dirent *direntry){
1313
/* Skip "." and ".." */
1314
if(direntry->d_name[0] == '.'
1315
and (direntry->d_name[1] == '\0'
1316
or (direntry->d_name[1] == '.'
1317
and direntry->d_name[2] == '\0'))){
1318
return 0;
1319
}
1320
return 1;
1321
}
1322
1323
/* Is this directory entry a runnable program? */
1324
__attribute__((nonnull, warn_unused_result))
1325
int runnable_hook(const struct dirent *direntry){
1326
int ret;
1327
size_t sret;
1328
struct stat st;
1329
1330
if((direntry->d_name)[0] == '\0'){
1331
/* Empty name? */
1332
return 0;
1333
}
1334
1335
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1336
"abcdefghijklmnopqrstuvwxyz"
1337
"0123456789"
1338
"_.-");
1339
if((direntry->d_name)[sret] != '\0'){
1340
/* Contains non-allowed characters */
1341
if(debug){
1342
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1343
direntry->d_name);
1344
}
1345
return 0;
1346
}
1347
1348
char *fullname = NULL;
1349
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1350
if(ret < 0){
1351
perror_plus("asprintf");
1352
return 0;
1353
}
1354
1355
ret = stat(fullname, &st);
1356
if(ret == -1){
1357
if(debug){
1358
perror_plus("Could not stat hook");
1359
}
1360
return 0;
1361
}
1362
free(fullname);
1363
if(not (S_ISREG(st.st_mode))){
1364
/* Not a regular file */
1365
if(debug){
1366
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1367
direntry->d_name);
1368
}
1369
return 0;
1370
}
1371
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1372
/* Not executable */
1373
if(debug){
1374
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1375
direntry->d_name);
1376
}
1377
return 0;
1378
}
1379
if(debug){
1380
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1381
direntry->d_name);
1382
}
1383
return 1;
1384
}
1385
1386
__attribute__((nonnull, warn_unused_result))
1387
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1388
mandos_context *mc){
1389
int ret;
1390
struct timespec now;
1391
struct timespec waited_time;
1392
intmax_t block_time;
1393
1394
while(true){
1395
if(mc->current_server == NULL){
1396
if(debug){
1397
fprintf_plus(stderr, "Wait until first server is found."
1398
" No timeout!\n");
1399
}
1400
ret = avahi_simple_poll_iterate(s, -1);
1401
} else {
1402
if(debug){
1403
fprintf_plus(stderr, "Check current_server if we should run"
1404
" it, or wait\n");
1405
}
1406
/* the current time */
1407
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1408
if(ret == -1){
1409
perror_plus("clock_gettime");
1410
return -1;
1411
}
1412
/* Calculating in ms how long time between now and server
1413
who we visted longest time ago. Now - last seen. */
1414
waited_time.tv_sec = (now.tv_sec
1415
- mc->current_server->last_seen.tv_sec);
1416
waited_time.tv_nsec = (now.tv_nsec
1417
- mc->current_server->last_seen.tv_nsec);
1418
/* total time is 10s/10,000ms.
1419
Converting to s from ms by dividing by 1,000,
1420
and ns to ms by dividing by 1,000,000. */
1421
block_time = ((retry_interval
1422
- ((intmax_t)waited_time.tv_sec * 1000))
1423
- ((intmax_t)waited_time.tv_nsec / 1000000));
1424
1425
if(debug){
1426
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1427
block_time);
1428
}
1429
1430
if(block_time <= 0){
1431
ret = start_mandos_communication(mc->current_server->ip,
1432
mc->current_server->port,
1433
mc->current_server->if_index,
1434
mc->current_server->af, mc);
1435
if(ret == 0){
1436
avahi_simple_poll_quit(s);
1437
return 0;
1438
}
1439
ret = clock_gettime(CLOCK_MONOTONIC,
1440
&mc->current_server->last_seen);
1441
if(ret == -1){
1442
perror_plus("clock_gettime");
1443
return -1;
1444
}
1445
mc->current_server = mc->current_server->next;
1446
block_time = 0; /* Call avahi to find new Mandos
1447
servers, but don't block */
1448
}
1449
1450
ret = avahi_simple_poll_iterate(s, (int)block_time);
1451
}
1452
if(ret != 0){
1453
if(ret > 0 or errno != EINTR){
1454
return (ret != 1) ? ret : 0;
1455
}
1456
}
1457
}
1458
}
1459
1460
/* Set effective uid to 0, return errno */
1461
__attribute__((warn_unused_result))
1462
error_t raise_privileges(void){
1463
error_t old_errno = errno;
1464
error_t ret_errno = 0;
1465
if(seteuid(0) == -1){
1466
ret_errno = errno;
1467
perror_plus("seteuid");
1468
}
1469
errno = old_errno;
1470
return ret_errno;
1471
}
1472
1473
/* Set effective and real user ID to 0. Return errno. */
1474
__attribute__((warn_unused_result))
1475
error_t raise_privileges_permanently(void){
1476
error_t old_errno = errno;
1477
error_t ret_errno = raise_privileges();
1478
if(ret_errno != 0){
1479
errno = old_errno;
1480
return ret_errno;
1481
}
1482
if(setuid(0) == -1){
1483
ret_errno = errno;
1484
perror_plus("seteuid");
1485
}
1486
errno = old_errno;
1487
return ret_errno;
1488
}
1489
1490
/* Set effective user ID to unprivileged saved user ID */
1491
__attribute__((warn_unused_result))
1492
error_t lower_privileges(void){
1493
error_t old_errno = errno;
1494
error_t ret_errno = 0;
1495
if(seteuid(uid) == -1){
1496
ret_errno = errno;
1497
perror_plus("seteuid");
1498
}
1499
errno = old_errno;
1500
return ret_errno;
1501
}
1502
1503
/* Lower privileges permanently */
1504
__attribute__((warn_unused_result))
1505
error_t lower_privileges_permanently(void){
1506
error_t old_errno = errno;
1507
error_t ret_errno = 0;
1508
if(setuid(uid) == -1){
1509
ret_errno = errno;
1510
perror_plus("setuid");
1511
}
1512
errno = old_errno;
1513
return ret_errno;
1514
}
1515
1516
__attribute__((nonnull))
1517
void run_network_hooks(const char *mode, const char *interface,
1518
const float delay){
1519
struct dirent **direntries;
1520
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1521
alphasort);
1522
if(numhooks == -1){
1523
if(errno == ENOENT){
1524
if(debug){
1525
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1526
" found\n", hookdir);
1527
}
1528
} else {
1529
perror_plus("scandir");
1530
}
1531
} else {
1532
struct dirent *direntry;
1533
int ret;
1534
int devnull = open("/dev/null", O_RDONLY);
1535
for(int i = 0; i < numhooks; i++){
1536
direntry = direntries[i];
1537
char *fullname = NULL;
1538
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1539
if(ret < 0){
1540
perror_plus("asprintf");
1541
continue;
1542
}
1543
if(debug){
1544
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1545
direntry->d_name);
1546
}
1547
pid_t hook_pid = fork();
1548
if(hook_pid == 0){
1549
/* Child */
1550
/* Raise privileges */
1551
if(raise_privileges_permanently() != 0){
1552
perror_plus("Failed to raise privileges");
1553
_exit(EX_NOPERM);
1554
}
1555
/* Set group */
1556
errno = 0;
1557
ret = setgid(0);
1558
if(ret == -1){
1559
perror_plus("setgid");
1560
_exit(EX_NOPERM);
1561
}
1562
/* Reset supplementary groups */
1563
errno = 0;
1564
ret = setgroups(0, NULL);
1565
if(ret == -1){
1566
perror_plus("setgroups");
1567
_exit(EX_NOPERM);
1568
}
1569
ret = dup2(devnull, STDIN_FILENO);
1570
if(ret == -1){
1571
perror_plus("dup2(devnull, STDIN_FILENO)");
1572
_exit(EX_OSERR);
1573
}
1574
ret = close(devnull);
1575
if(ret == -1){
1576
perror_plus("close");
1577
_exit(EX_OSERR);
1578
}
1579
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1580
if(ret == -1){
1581
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1582
_exit(EX_OSERR);
1583
}
1584
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1585
if(ret == -1){
1586
perror_plus("setenv");
1587
_exit(EX_OSERR);
1588
}
1589
ret = setenv("DEVICE", interface, 1);
1590
if(ret == -1){
1591
perror_plus("setenv");
1592
_exit(EX_OSERR);
1593
}
1594
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1595
if(ret == -1){
1596
perror_plus("setenv");
1597
_exit(EX_OSERR);
1598
}
1599
ret = setenv("MODE", mode, 1);
1600
if(ret == -1){
1601
perror_plus("setenv");
1602
_exit(EX_OSERR);
1603
}
1604
char *delaystring;
1605
ret = asprintf(&delaystring, "%f", (double)delay);
1606
if(ret == -1){
1607
perror_plus("asprintf");
1608
_exit(EX_OSERR);
1609
}
1610
ret = setenv("DELAY", delaystring, 1);
1611
if(ret == -1){
1612
free(delaystring);
1613
perror_plus("setenv");
1614
_exit(EX_OSERR);
1615
}
1616
free(delaystring);
1617
if(connect_to != NULL){
1618
ret = setenv("CONNECT", connect_to, 1);
1619
if(ret == -1){
1620
perror_plus("setenv");
1621
_exit(EX_OSERR);
1622
}
1623
}
1624
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1625
perror_plus("execl");
1626
_exit(EXIT_FAILURE);
1627
}
1628
} else {
1629
int status;
1630
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1631
perror_plus("waitpid");
1632
free(fullname);
1633
continue;
1634
}
1635
if(WIFEXITED(status)){
1636
if(WEXITSTATUS(status) != 0){
1637
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1638
" with status %d\n", direntry->d_name,
1639
WEXITSTATUS(status));
1640
free(fullname);
1641
continue;
1642
}
1643
} else if(WIFSIGNALED(status)){
1644
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1645
" signal %d\n", direntry->d_name,
1646
WTERMSIG(status));
1647
free(fullname);
1648
continue;
1649
} else {
1650
fprintf_plus(stderr, "Warning: network hook \"%s\""
1651
" crashed\n", direntry->d_name);
1652
free(fullname);
1653
continue;
1654
}
1655
}
1656
free(fullname);
1657
if(debug){
1658
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1659
direntry->d_name);
1660
}
1661
}
1662
close(devnull);
1663
}
1664
}
1665
1666
__attribute__((nonnull, warn_unused_result))
1667
error_t bring_up_interface(const char *const interface,
1668
const float delay){
1669
error_t old_errno = errno;
1670
int ret;
1671
struct ifreq network;
1672
unsigned int if_index = if_nametoindex(interface);
1673
if(if_index == 0){
1674
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1675
errno = old_errno;
1676
return ENXIO;
1677
}
1678
1679
if(quit_now){
1680
errno = old_errno;
1681
return EINTR;
1682
}
1683
1684
if(not interface_is_up(interface)){
1685
error_t ret_errno = 0, ioctl_errno = 0;
1686
if(not get_flags(interface, &network)){
1687
ret_errno = errno;
1688
fprintf_plus(stderr, "Failed to get flags for interface "
1689
"\"%s\"\n", interface);
1690
errno = old_errno;
1691
return ret_errno;
1692
}
1693
network.ifr_flags |= IFF_UP; /* set flag */
1694
1695
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1696
if(sd == -1){
1697
ret_errno = errno;
1698
perror_plus("socket");
1699
errno = old_errno;
1700
return ret_errno;
1701
}
1702
1703
if(quit_now){
1704
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1705
if(ret == -1){
1706
perror_plus("close");
1707
}
1708
errno = old_errno;
1709
return EINTR;
1710
}
1711
1712
if(debug){
1713
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1714
interface);
1715
}
1716
1717
/* Raise privileges */
1718
ret_errno = raise_privileges();
1719
if(ret_errno != 0){
1720
perror_plus("Failed to raise privileges");
1721
}
1722
1723
#ifdef __linux__
1724
int ret_linux;
1725
bool restore_loglevel = false;
1726
if(ret_errno == 0){
1727
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1728
messages about the network interface to mess up the prompt */
1729
ret_linux = klogctl(8, NULL, 5);
1730
if(ret_linux == -1){
1731
perror_plus("klogctl");
1732
} else {
1733
restore_loglevel = true;
1734
}
1735
}
1736
#endif /* __linux__ */
1737
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1738
ioctl_errno = errno;
1739
#ifdef __linux__
1740
if(restore_loglevel){
1741
ret_linux = klogctl(7, NULL, 0);
1742
if(ret_linux == -1){
1743
perror_plus("klogctl");
1744
}
1745
}
1746
#endif /* __linux__ */
1747
1748
/* If raise_privileges() succeeded above */
1749
if(ret_errno == 0){
1750
/* Lower privileges */
1751
ret_errno = lower_privileges();
1752
if(ret_errno != 0){
1753
errno = ret_errno;
1754
perror_plus("Failed to lower privileges");
1755
}
1756
}
1757
1758
/* Close the socket */
1759
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1760
if(ret == -1){
1761
perror_plus("close");
1762
}
1763
1764
if(ret_setflags == -1){
1765
errno = ioctl_errno;
1766
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1767
errno = old_errno;
1768
return ioctl_errno;
1769
}
1770
} else if(debug){
1771
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1772
interface);
1773
}
1774
1775
/* Sleep checking until interface is running.
1776
Check every 0.25s, up to total time of delay */
1777
for(int i=0; i < delay * 4; i++){
1778
if(interface_is_running(interface)){
1779
break;
1780
}
1781
struct timespec sleeptime = { .tv_nsec = 250000000 };
1782
ret = nanosleep(&sleeptime, NULL);
1783
if(ret == -1 and errno != EINTR){
1784
perror_plus("nanosleep");
1785
}
1786
}
1787
1788
errno = old_errno;
1789
return 0;
1790
}
1791
1792
__attribute__((nonnull, warn_unused_result))
1793
error_t take_down_interface(const char *const interface){
1794
error_t old_errno = errno;
1795
struct ifreq network;
1796
unsigned int if_index = if_nametoindex(interface);
1797
if(if_index == 0){
1798
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1799
errno = old_errno;
1800
return ENXIO;
1801
}
1802
if(interface_is_up(interface)){
1803
error_t ret_errno = 0, ioctl_errno = 0;
1804
if(not get_flags(interface, &network) and debug){
1805
ret_errno = errno;
1806
fprintf_plus(stderr, "Failed to get flags for interface "
1807
"\"%s\"\n", interface);
1808
errno = old_errno;
1809
return ret_errno;
1810
}
1811
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1812
1813
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1814
if(sd == -1){
1815
ret_errno = errno;
1816
perror_plus("socket");
1817
errno = old_errno;
1818
return ret_errno;
1819
}
1820
1821
if(debug){
1822
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1823
interface);
1824
}
1825
1826
/* Raise privileges */
1827
ret_errno = raise_privileges();
1828
if(ret_errno != 0){
1829
perror_plus("Failed to raise privileges");
1830
}
1831
1832
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1833
ioctl_errno = errno;
1834
1835
/* If raise_privileges() succeeded above */
1836
if(ret_errno == 0){
1837
/* Lower privileges */
1838
ret_errno = lower_privileges();
1839
if(ret_errno != 0){
1840
errno = ret_errno;
1841
perror_plus("Failed to lower privileges");
1842
}
1843
}
1844
1845
/* Close the socket */
1846
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1847
if(ret == -1){
1848
perror_plus("close");
1849
}
1850
1851
if(ret_setflags == -1){
1852
errno = ioctl_errno;
1853
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1854
errno = old_errno;
1855
return ioctl_errno;
1856
}
1857
} else if(debug){
1858
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1859
interface);
1860
}
1861
1862
errno = old_errno;
1863
return 0;
1864
}
1865
1866
810
int main(int argc, char *argv[]){
1867
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1868
.priority = "SECURE256:!CTYPE-X.509:"
1869
"+CTYPE-OPENPGP", .current_server = NULL,
1870
.interfaces = NULL, .interfaces_size = 0 };
1871
AvahiSServiceBrowser *sb = NULL;
1872
error_t ret_errno;
1873
int ret;
1874
intmax_t tmpmax;
1875
char *tmp;
1876
int exitcode = EXIT_SUCCESS;
1877
char *interfaces_to_take_down = NULL;
1878
size_t interfaces_to_take_down_size = 0;
1879
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1880
char old_tempdir[] = "/tmp/mandosXXXXXX";
1881
char *tempdir = NULL;
1882
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1883
const char *seckey = PATHDIR "/" SECKEY;
1884
const char *pubkey = PATHDIR "/" PUBKEY;
1885
char *interfaces_hooks = NULL;
1886
1887
bool gnutls_initialized = false;
1888
bool gpgme_initialized = false;
1889
float delay = 2.5f;
1890
double retry_interval = 10; /* 10s between trying a server and
1891
retrying the same server again */
1892
1893
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1894
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1895
1896
uid = getuid();
1897
gid = getgid();
1898
1899
/* Lower any group privileges we might have, just to be safe */
1900
errno = 0;
1901
ret = setgid(gid);
1902
if(ret == -1){
1903
perror_plus("setgid");
1904
}
1905
1906
/* Lower user privileges (temporarily) */
1907
errno = 0;
1908
ret = seteuid(uid);
1909
if(ret == -1){
1910
perror_plus("seteuid");
1911
}
1912
1913
if(quit_now){
1914
goto end;
1915
}
1916
1917
{
1918
struct argp_option options[] = {
1919
{ .name = "debug", .key = 128,
1920
.doc = "Debug mode", .group = 3 },
1921
{ .name = "connect", .key = 'c',
1922
.arg = "ADDRESS:PORT",
1923
.doc = "Connect directly to a specific Mandos server",
1924
.group = 1 },
1925
{ .name = "interface", .key = 'i',
1926
.arg = "NAME",
1927
.doc = "Network interface that will be used to search for"
1928
" Mandos servers",
1929
.group = 1 },
1930
{ .name = "seckey", .key = 's',
1931
.arg = "FILE",
1932
.doc = "OpenPGP secret key file base name",
1933
.group = 1 },
1934
{ .name = "pubkey", .key = 'p',
1935
.arg = "FILE",
1936
.doc = "OpenPGP public key file base name",
1937
.group = 2 },
1938
{ .name = "dh-bits", .key = 129,
1939
.arg = "BITS",
1940
.doc = "Bit length of the prime number used in the"
1941
" Diffie-Hellman key exchange",
1942
.group = 2 },
1943
{ .name = "priority", .key = 130,
1944
.arg = "STRING",
1945
.doc = "GnuTLS priority string for the TLS handshake",
1946
.group = 1 },
1947
{ .name = "delay", .key = 131,
1948
.arg = "SECONDS",
1949
.doc = "Maximum delay to wait for interface startup",
1950
.group = 2 },
1951
{ .name = "retry", .key = 132,
1952
.arg = "SECONDS",
1953
.doc = "Retry interval used when denied by the Mandos server",
1954
.group = 2 },
1955
{ .name = "network-hook-dir", .key = 133,
1956
.arg = "DIR",
1957
.doc = "Directory where network hooks are located",
1958
.group = 2 },
1959
/*
1960
* These reproduce what we would get without ARGP_NO_HELP
1961
*/
1962
{ .name = "help", .key = '?',
1963
.doc = "Give this help list", .group = -1 },
1964
{ .name = "usage", .key = -3,
1965
.doc = "Give a short usage message", .group = -1 },
1966
{ .name = "version", .key = 'V',
1967
.doc = "Print program version", .group = -1 },
1968
{ .name = NULL }
1969
};
1970
1971
error_t parse_opt(int key, char *arg,
1972
struct argp_state *state){
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
}
1973
999
errno = 0;
1974
switch(key){
1975
case 128: /* --debug */
1976
debug = true;
1977
break;
1978
case 'c': /* --connect */
1979
connect_to = arg;
1980
break;
1981
case 'i': /* --interface */
1982
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1983
arg, (int)',');
1984
if(ret_errno != 0){
1985
argp_error(state, "%s", strerror(ret_errno));
1986
}
1987
break;
1988
case 's': /* --seckey */
1989
seckey = arg;
1990
break;
1991
case 'p': /* --pubkey */
1992
pubkey = arg;
1993
break;
1994
case 129: /* --dh-bits */
1995
errno = 0;
1996
tmpmax = strtoimax(arg, &tmp, 10);
1997
if(errno != 0 or tmp == arg or *tmp != '\0'
1998
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1999
argp_error(state, "Bad number of DH bits");
2000
}
2001
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2002
break;
2003
case 130: /* --priority */
2004
mc.priority = arg;
2005
break;
2006
case 131: /* --delay */
2007
errno = 0;
2008
delay = strtof(arg, &tmp);
2009
if(errno != 0 or tmp == arg or *tmp != '\0'){
2010
argp_error(state, "Bad delay");
2011
}
2012
case 132: /* --retry */
2013
errno = 0;
2014
retry_interval = strtod(arg, &tmp);
2015
if(errno != 0 or tmp == arg or *tmp != '\0'
2016
or (retry_interval * 1000) > INT_MAX
2017
or retry_interval < 0){
2018
argp_error(state, "Bad retry interval");
2019
}
2020
break;
2021
case 133: /* --network-hook-dir */
2022
hookdir = arg;
2023
break;
2024
/*
2025
* These reproduce what we would get without ARGP_NO_HELP
2026
*/
2027
case '?': /* --help */
2028
argp_state_help(state, state->out_stream,
2029
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2030
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2031
case -3: /* --usage */
2032
argp_state_help(state, state->out_stream,
2033
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2034
case 'V': /* --version */
2035
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2036
exit(argp_err_exit_status);
2037
break;
2038
default:
2039
return ARGP_ERR_UNKNOWN;
2040
}
2041
return errno;
2042
}
2043
2044
struct argp argp = { .options = options, .parser = parse_opt,
2045
.args_doc = "",
2046
.doc = "Mandos client -- Get and decrypt"
2047
" passwords from a Mandos server" };
2048
ret = argp_parse(&argp, argc, argv,
2049
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2050
switch(ret){
2051
case 0:
2052
break;
2053
case ENOMEM:
2054
default:
2055
errno = ret;
2056
perror_plus("argp_parse");
2057
exitcode = EX_OSERR;
2058
goto end;
2059
case EINVAL:
2060
exitcode = EX_USAGE;
2061
goto end;
2062
}
2063
}
2064
2065
{
2066
/* Work around Debian bug #633582:
2067
<http://bugs.debian.org/633582> */
2068
2069
/* Re-raise privileges */
2070
ret_errno = raise_privileges();
2071
if(ret_errno != 0){
2072
errno = ret_errno;
2073
perror_plus("Failed to raise privileges");
2074
} else {
2075
struct stat st;
2076
2077
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2078
int seckey_fd = open(seckey, O_RDONLY);
2079
if(seckey_fd == -1){
2080
perror_plus("open");
2081
} else {
2082
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2083
if(ret == -1){
2084
perror_plus("fstat");
2085
} else {
2086
if(S_ISREG(st.st_mode)
2087
and st.st_uid == 0 and st.st_gid == 0){
2088
ret = fchown(seckey_fd, uid, gid);
2089
if(ret == -1){
2090
perror_plus("fchown");
2091
}
2092
}
2093
}
2094
TEMP_FAILURE_RETRY(close(seckey_fd));
2095
}
2096
}
2097
2098
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2099
int pubkey_fd = open(pubkey, O_RDONLY);
2100
if(pubkey_fd == -1){
2101
perror_plus("open");
2102
} else {
2103
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2104
if(ret == -1){
2105
perror_plus("fstat");
2106
} else {
2107
if(S_ISREG(st.st_mode)
2108
and st.st_uid == 0 and st.st_gid == 0){
2109
ret = fchown(pubkey_fd, uid, gid);
2110
if(ret == -1){
2111
perror_plus("fchown");
2112
}
2113
}
2114
}
2115
TEMP_FAILURE_RETRY(close(pubkey_fd));
2116
}
2117
}
2118
2119
/* Lower privileges */
2120
ret_errno = lower_privileges();
2121
if(ret_errno != 0){
2122
errno = ret_errno;
2123
perror_plus("Failed to lower privileges");
2124
}
2125
}
2126
}
2127
2128
/* Remove invalid interface names (except "none") */
2129
{
2130
char *interface = NULL;
2131
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2132
interface))){
2133
if(strcmp(interface, "none") != 0
2134
and if_nametoindex(interface) == 0){
2135
if(interface[0] != '\0'){
2136
fprintf_plus(stderr, "Not using nonexisting interface"
2137
" \"%s\"\n", interface);
2138
}
2139
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2140
interface = NULL;
2141
}
2142
}
2143
}
2144
2145
/* Run network hooks */
2146
{
2147
if(mc.interfaces != NULL){
2148
interfaces_hooks = malloc(mc.interfaces_size);
2149
if(interfaces_hooks == NULL){
2150
perror_plus("malloc");
1000
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
1001
if(errno){
1002
perror("Bad port number");
1003
exitcode = EXIT_FAILURE;
2151
1004
goto end;
2152
1005
}
2153
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2154
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2155
}
2156
run_network_hooks("start", interfaces_hooks != NULL ?
2157
interfaces_hooks : "", delay);
2158
}
2159
2160
if(not debug){
2161
avahi_set_log_function(empty_log);
2162
}
2163
2164
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2165
from the signal handler */
2166
/* Initialize the pseudo-RNG for Avahi */
2167
srand((unsigned int) time(NULL));
2168
simple_poll = avahi_simple_poll_new();
2169
if(simple_poll == NULL){
2170
fprintf_plus(stderr,
2171
"Avahi: Failed to create simple poll object.\n");
2172
exitcode = EX_UNAVAILABLE;
2173
goto end;
2174
}
2175
2176
sigemptyset(&sigterm_action.sa_mask);
2177
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2178
if(ret == -1){
2179
perror_plus("sigaddset");
2180
exitcode = EX_OSERR;
2181
goto end;
2182
}
2183
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2184
if(ret == -1){
2185
perror_plus("sigaddset");
2186
exitcode = EX_OSERR;
2187
goto end;
2188
}
2189
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2190
if(ret == -1){
2191
perror_plus("sigaddset");
2192
exitcode = EX_OSERR;
2193
goto end;
2194
}
2195
/* Need to check if the handler is SIG_IGN before handling:
2196
| [[info:libc:Initial Signal Actions]] |
2197
| [[info:libc:Basic Signal Handling]] |
2198
*/
2199
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2200
if(ret == -1){
2201
perror_plus("sigaction");
2202
return EX_OSERR;
2203
}
2204
if(old_sigterm_action.sa_handler != SIG_IGN){
2205
ret = sigaction(SIGINT, &sigterm_action, NULL);
2206
if(ret == -1){
2207
perror_plus("sigaction");
2208
exitcode = EX_OSERR;
2209
goto end;
2210
}
2211
}
2212
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2213
if(ret == -1){
2214
perror_plus("sigaction");
2215
return EX_OSERR;
2216
}
2217
if(old_sigterm_action.sa_handler != SIG_IGN){
2218
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2219
if(ret == -1){
2220
perror_plus("sigaction");
2221
exitcode = EX_OSERR;
2222
goto end;
2223
}
2224
}
2225
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2226
if(ret == -1){
2227
perror_plus("sigaction");
2228
return EX_OSERR;
2229
}
2230
if(old_sigterm_action.sa_handler != SIG_IGN){
2231
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2232
if(ret == -1){
2233
perror_plus("sigaction");
2234
exitcode = EX_OSERR;
2235
goto end;
2236
}
2237
}
2238
2239
/* If no interfaces were specified, make a list */
2240
if(mc.interfaces == NULL){
2241
struct dirent **direntries;
2242
/* Look for any good interfaces */
2243
ret = scandir(sys_class_net, &direntries, good_interface,
2244
alphasort);
2245
if(ret >= 1){
2246
/* Add all found interfaces to interfaces list */
2247
for(int i = 0; i < ret; ++i){
2248
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2249
direntries[i]->d_name);
2250
if(ret_errno != 0){
2251
errno = ret_errno;
2252
perror_plus("argz_add");
2253
continue;
2254
}
2255
if(debug){
2256
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2257
direntries[i]->d_name);
2258
}
2259
}
2260
free(direntries);
2261
} else {
2262
free(direntries);
2263
fprintf_plus(stderr, "Could not find a network interface\n");
2264
exitcode = EXIT_FAILURE;
2265
goto end;
2266
}
2267
}
2268
2269
/* Bring up interfaces which are down, and remove any "none"s */
2270
{
2271
char *interface = NULL;
2272
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2273
interface))){
2274
/* If interface name is "none", stop bringing up interfaces.
2275
Also remove all instances of "none" from the list */
2276
if(strcmp(interface, "none") == 0){
2277
argz_delete(&mc.interfaces, &mc.interfaces_size,
2278
interface);
2279
interface = NULL;
2280
while((interface = argz_next(mc.interfaces,
2281
mc.interfaces_size, interface))){
2282
if(strcmp(interface, "none") == 0){
2283
argz_delete(&mc.interfaces, &mc.interfaces_size,
2284
interface);
2285
interface = NULL;
2286
}
2287
}
2288
break;
2289
}
2290
bool interface_was_up = interface_is_up(interface);
2291
errno = bring_up_interface(interface, delay);
2292
if(not interface_was_up){
2293
if(errno != 0){
2294
perror_plus("Failed to bring up interface");
2295
} else {
2296
errno = argz_add(&interfaces_to_take_down,
2297
&interfaces_to_take_down_size,
2298
interface);
2299
if(errno != 0){
2300
perror_plus("argz_add");
2301
}
2302
}
2303
}
2304
}
2305
if(debug and (interfaces_to_take_down == NULL)){
2306
fprintf_plus(stderr, "No interfaces were brought up\n");
2307
}
2308
}
2309
2310
/* If we only got one interface, explicitly use only that one */
2311
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2312
if(debug){
2313
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2314
mc.interfaces);
2315
}
2316
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2317
}
2318
2319
if(quit_now){
2320
goto end;
2321
}
2322
2323
ret = init_gnutls_global(pubkey, seckey, &mc);
2324
if(ret == -1){
2325
fprintf_plus(stderr, "init_gnutls_global failed\n");
2326
exitcode = EX_UNAVAILABLE;
2327
goto end;
2328
} else {
2329
gnutls_initialized = true;
2330
}
2331
2332
if(quit_now){
2333
goto end;
2334
}
2335
2336
/* Try /run/tmp before /tmp */
2337
tempdir = mkdtemp(run_tempdir);
2338
if(tempdir == NULL and errno == ENOENT){
2339
if(debug){
2340
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2341
run_tempdir, old_tempdir);
2342
}
2343
tempdir = mkdtemp(old_tempdir);
2344
}
2345
if(tempdir == NULL){
2346
perror_plus("mkdtemp");
2347
goto end;
2348
}
2349
2350
if(quit_now){
2351
goto end;
2352
}
2353
2354
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2355
fprintf_plus(stderr, "init_gpgme failed\n");
2356
exitcode = EX_UNAVAILABLE;
2357
goto end;
2358
} else {
2359
gpgme_initialized = true;
2360
}
2361
2362
if(quit_now){
2363
goto end;
2364
}
2365
2366
if(connect_to != NULL){
2367
/* Connect directly, do not use Zeroconf */
2368
/* (Mainly meant for debugging) */
2369
char *address = strrchr(connect_to, ':');
2370
2371
if(address == NULL){
2372
fprintf_plus(stderr, "No colon in address\n");
2373
exitcode = EX_USAGE;
2374
goto end;
2375
}
2376
2377
if(quit_now){
2378
goto end;
2379
}
2380
2381
in_port_t port;
2382
errno = 0;
2383
tmpmax = strtoimax(address+1, &tmp, 10);
2384
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2385
or tmpmax != (in_port_t)tmpmax){
2386
fprintf_plus(stderr, "Bad port number\n");
2387
exitcode = EX_USAGE;
2388
goto end;
2389
}
2390
2391
if(quit_now){
2392
goto end;
2393
}
2394
2395
port = (in_port_t)tmpmax;
2396
*address = '\0';
2397
/* Colon in address indicates IPv6 */
2398
int af;
2399
if(strchr(connect_to, ':') != NULL){
2400
af = AF_INET6;
2401
/* Accept [] around IPv6 address - see RFC 5952 */
2402
if(connect_to[0] == '[' and address[-1] == ']')
2403
{
2404
connect_to++;
2405
address[-1] = '\0';
2406
}
2407
} else {
2408
af = AF_INET;
2409
}
2410
address = connect_to;
2411
2412
if(quit_now){
2413
goto end;
2414
}
2415
2416
while(not quit_now){
2417
ret = start_mandos_communication(address, port, if_index, af,
2418
&mc);
2419
if(quit_now or ret == 0){
2420
break;
2421
}
2422
if(debug){
2423
fprintf_plus(stderr, "Retrying in %d seconds\n",
2424
(int)retry_interval);
2425
}
2426
sleep((unsigned int)retry_interval);
2427
}
2428
2429
if(not quit_now){
2430
exitcode = EXIT_SUCCESS;
2431
}
2432
2433
goto end;
2434
}
2435
2436
if(quit_now){
2437
goto end;
2438
}
2439
2440
{
2441
AvahiServerConfig config;
2442
/* Do not publish any local Zeroconf records */
2443
avahi_server_config_init(&config);
2444
config.publish_hinfo = 0;
2445
config.publish_addresses = 0;
2446
config.publish_workstation = 0;
2447
config.publish_domain = 0;
2448
2449
/* Allocate a new server */
2450
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2451
&config, NULL, NULL, &ret_errno);
2452
2453
/* Free the Avahi configuration data */
2454
avahi_server_config_free(&config);
2455
}
2456
2457
/* Check if creating the Avahi server object succeeded */
2458
if(mc.server == NULL){
2459
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2460
avahi_strerror(ret_errno));
2461
exitcode = EX_UNAVAILABLE;
2462
goto end;
2463
}
2464
2465
if(quit_now){
2466
goto end;
2467
}
2468
2469
/* Create the Avahi service browser */
2470
sb = avahi_s_service_browser_new(mc.server, if_index,
2471
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2472
NULL, 0, browse_callback,
2473
(void *)&mc);
2474
if(sb == NULL){
2475
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2476
avahi_strerror(avahi_server_errno(mc.server)));
2477
exitcode = EX_UNAVAILABLE;
2478
goto end;
2479
}
2480
2481
if(quit_now){
2482
goto end;
2483
}
2484
2485
/* Run the main loop */
2486
2487
if(debug){
2488
fprintf_plus(stderr, "Starting Avahi loop search\n");
2489
}
2490
2491
ret = avahi_loop_with_timeout(simple_poll,
2492
(int)(retry_interval * 1000), &mc);
2493
if(debug){
2494
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2495
(ret == 0) ? "successfully" : "with error");
2496
}
2497
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
2498
1079
end:
2499
2500
if(debug){
2501
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2502
}
2503
2504
/* Cleanup things */
2505
free(mc.interfaces);
2506
2507
if(sb != NULL)
2508
avahi_s_service_browser_free(sb);
2509
2510
if(mc.server != NULL)
2511
avahi_server_free(mc.server);
2512
2513
if(simple_poll != NULL)
2514
avahi_simple_poll_free(simple_poll);
2515
2516
if(gnutls_initialized){
2517
gnutls_certificate_free_credentials(mc.cred);
2518
gnutls_global_deinit();
2519
gnutls_dh_params_deinit(mc.dh_params);
2520
}
2521
2522
if(gpgme_initialized){
2523
gpgme_release(mc.ctx);
2524
}
2525
2526
/* Cleans up the circular linked list of Mandos servers the client
2527
has seen */
2528
if(mc.current_server != NULL){
2529
mc.current_server->prev->next = NULL;
2530
while(mc.current_server != NULL){
2531
server *next = mc.current_server->next;
2532
free(mc.current_server);
2533
mc.current_server = next;
2534
}
2535
}
2536
2537
/* Re-raise privileges */
2538
{
2539
ret_errno = raise_privileges();
2540
if(ret_errno != 0){
2541
perror_plus("Failed to raise privileges");
2542
} else {
2543
2544
/* Run network hooks */
2545
run_network_hooks("stop", interfaces_hooks != NULL ?
2546
interfaces_hooks : "", delay);
2547
2548
/* Take down the network interfaces which were brought up */
2549
{
2550
char *interface = NULL;
2551
while((interface=argz_next(interfaces_to_take_down,
2552
interfaces_to_take_down_size,
2553
interface))){
2554
ret_errno = take_down_interface(interface);
2555
if(ret_errno != 0){
2556
errno = ret_errno;
2557
perror_plus("Failed to take down interface");
2558
}
2559
}
2560
if(debug and (interfaces_to_take_down == NULL)){
2561
fprintf_plus(stderr, "No interfaces needed to be taken"
2562
" down\n");
2563
}
2564
}
2565
}
2566
2567
ret_errno = lower_privileges_permanently();
2568
if(ret_errno != 0){
2569
perror_plus("Failed to lower privileges permanently");
2570
}
2571
}
2572
2573
free(interfaces_to_take_down);
2574
free(interfaces_hooks);
2575
2576
/* Removes the GPGME temp directory and all files inside */
2577
if(tempdir != NULL){
2578
struct dirent **direntries = NULL;
2579
struct dirent *direntry = NULL;
2580
int numentries = scandir(tempdir, &direntries, notdotentries,
2581
alphasort);
2582
if(numentries > 0){
2583
for(int i = 0; i < numentries; i++){
2584
direntry = direntries[i];
2585
char *fullname = NULL;
2586
ret = asprintf(&fullname, "%s/%s", tempdir,
2587
direntry->d_name);
2588
if(ret < 0){
2589
perror_plus("asprintf");
2590
continue;
2591
}
2592
ret = remove(fullname);
2593
if(ret == -1){
2594
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2595
strerror(errno));
2596
}
2597
free(fullname);
2598
}
2599
}
2600
2601
/* need to clean even if 0 because man page doesn't specify */
2602
free(direntries);
2603
if(numentries == -1){
2604
perror_plus("scandir");
2605
}
2606
ret = rmdir(tempdir);
2607
if(ret == -1 and errno != ENOENT){
2608
perror_plus("rmdir");
2609
}
2610
}
2611
2612
if(quit_now){
2613
sigemptyset(&old_sigterm_action.sa_mask);
2614
old_sigterm_action.sa_handler = SIG_DFL;
2615
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2616
&old_sigterm_action,
2617
NULL));
2618
if(ret == -1){
2619
perror_plus("sigaction");
2620
}
2621
do {
2622
ret = raise(signal_received);
2623
} while(ret != 0 and errno == EINTR);
2624
if(ret != 0){
2625
perror_plus("raise");
2626
abort();
2627
}
2628
TEMP_FAILURE_RETRY(pause());
2629
}
2630
2631
return exitcode;
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;
2632
1143
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0