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- Committer: Teddy Hogeborn
- Date: 2008-09-06 17:24:58 UTC
- Revision ID: teddy@fukt.bsnet.se-20080906172458-2x5wlfkn7oqckt1y
* legalnotice.xml: Copy DocBook 4.4-formatted text from
<http://www.gnu.org/licenses/gpl-3.0.dbk>.
<http://www.gnu.org/licenses/gpl-3.0.dbk>.
- files added:
- etc-plugins.d-README
- files removed:
- .bzr-builddeb
- debian
- debian/po
- 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 © 2007-2008 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 /* not _LARGEFILE_SOURCE */
36
#ifndef _FILE_OFFSET_BITS
37
33
#define _FILE_OFFSET_BITS 64
38
#endif /* not _FILE_OFFSET_BITS */
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
129
101
130
102
#define BUFFER_SIZE 256
131
103
104
/*
105
#define PATHDIR "/conf/conf.d/mandos"
106
*/
107
132
108
#define PATHDIR "/conf/conf.d/mandos"
133
109
#define SECKEY "seckey.txt"
134
110
#define PUBKEY "pubkey.txt"
135
#define HOOKDIR "/lib/mandos/network-hooks.d"
136
111
137
112
bool debug = false;
138
113
static const char mandos_protocol_version[] = "1";
139
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
int hookdir_fd = -1;
145
uid_t uid = 65534;
146
gid_t gid = 65534;
147
148
/* Doubly linked list that need to be circularly linked when used */
149
typedef struct server{
150
const char *ip;
151
in_port_t port;
152
AvahiIfIndex if_index;
153
int af;
154
struct timespec last_seen;
155
struct server *next;
156
struct server *prev;
157
} server;
114
const char *argp_program_version = "mandos-client 1.0";
115
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
158
116
159
117
/* Used for passing in values through the Avahi callback functions */
160
118
typedef struct {
119
AvahiSimplePoll *simple_poll;
161
120
AvahiServer *server;
162
121
gnutls_certificate_credentials_t cred;
163
122
unsigned int dh_bits;
164
123
gnutls_dh_params_t dh_params;
165
124
const char *priority;
166
125
gpgme_ctx_t ctx;
167
server *current_server;
168
char *interfaces;
169
size_t interfaces_size;
170
126
} mandos_context;
171
127
172
/* global so signal handler can reach it*/
173
AvahiSimplePoll *simple_poll;
174
175
sig_atomic_t quit_now = 0;
176
int signal_received = 0;
177
178
/* Function to use when printing errors */
179
void perror_plus(const char *print_text){
180
int e = errno;
181
fprintf(stderr, "Mandos plugin %s: ",
182
program_invocation_short_name);
183
errno = e;
184
perror(print_text);
185
}
186
187
__attribute__((format (gnu_printf, 2, 3), nonnull))
188
int fprintf_plus(FILE *stream, const char *format, ...){
189
va_list ap;
190
va_start (ap, format);
191
192
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
193
program_invocation_short_name));
194
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
195
}
196
197
128
/*
198
* Make additional room in "buffer" for at least BUFFER_SIZE more
199
* bytes. "buffer_capacity" is how much is currently allocated,
129
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
130
* "buffer_capacity" is how much is currently allocated,
200
131
* "buffer_length" is how much is already used.
201
132
*/
202
__attribute__((nonnull, warn_unused_result))
203
size_t incbuffer(char **buffer, size_t buffer_length,
204
size_t buffer_capacity){
205
if(buffer_length + BUFFER_SIZE > buffer_capacity){
206
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
207
if(new_buf == NULL){
208
int old_errno = errno;
209
free(*buffer);
210
errno = old_errno;
211
*buffer = NULL;
133
size_t adjustbuffer(char **buffer, size_t buffer_length,
134
size_t buffer_capacity){
135
if (buffer_length + BUFFER_SIZE > buffer_capacity){
136
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
137
if (buffer == NULL){
212
138
return 0;
213
139
}
214
*buffer = new_buf;
215
140
buffer_capacity += BUFFER_SIZE;
216
141
}
217
142
return buffer_capacity;
218
143
}
219
144
220
/* Add server to set of servers to retry periodically */
221
__attribute__((nonnull, warn_unused_result))
222
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
223
int af, server **current_server){
224
int ret;
225
server *new_server = malloc(sizeof(server));
226
if(new_server == NULL){
227
perror_plus("malloc");
228
return false;
229
}
230
*new_server = (server){ .ip = strdup(ip),
231
.port = port,
232
.if_index = if_index,
233
.af = af };
234
if(new_server->ip == NULL){
235
perror_plus("strdup");
236
return false;
237
}
238
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
239
if(ret == -1){
240
perror_plus("clock_gettime");
241
return false;
242
}
243
/* Special case of first server */
244
if(*current_server == NULL){
245
new_server->next = new_server;
246
new_server->prev = new_server;
247
*current_server = new_server;
248
} else {
249
/* Place the new server last in the list */
250
new_server->next = *current_server;
251
new_server->prev = (*current_server)->prev;
252
new_server->prev->next = new_server;
253
(*current_server)->prev = new_server;
254
}
255
return true;
256
}
257
258
145
/*
259
146
* Initialize GPGME.
260
147
*/
261
__attribute__((nonnull, warn_unused_result))
262
static bool init_gpgme(const char * const seckey,
263
const char * const pubkey,
264
const char * const tempdir,
265
mandos_context *mc){
148
static bool init_gpgme(mandos_context *mc, const char *seckey,
149
const char *pubkey, const char *tempdir){
150
int ret;
266
151
gpgme_error_t rc;
267
152
gpgme_engine_info_t engine_info;
268
153
154
269
155
/*
270
* Helper function to insert pub and seckey to the engine keyring.
156
* Helper function to insert pub and seckey to the enigne keyring.
271
157
*/
272
bool import_key(const char * const filename){
273
int ret;
158
bool import_key(const char *filename){
274
159
int fd;
275
160
gpgme_data_t pgp_data;
276
161
277
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
162
fd = TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
278
163
if(fd == -1){
279
perror_plus("open");
164
perror("open");
280
165
return false;
281
166
}
282
167
283
168
rc = gpgme_data_new_from_fd(&pgp_data, fd);
284
if(rc != GPG_ERR_NO_ERROR){
285
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
286
gpgme_strsource(rc), gpgme_strerror(rc));
169
if (rc != GPG_ERR_NO_ERROR){
170
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
171
gpgme_strsource(rc), gpgme_strerror(rc));
287
172
return false;
288
173
}
289
174
290
175
rc = gpgme_op_import(mc->ctx, pgp_data);
291
if(rc != GPG_ERR_NO_ERROR){
292
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
293
gpgme_strsource(rc), gpgme_strerror(rc));
176
if (rc != GPG_ERR_NO_ERROR){
177
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
178
gpgme_strsource(rc), gpgme_strerror(rc));
294
179
return false;
295
180
}
296
181
297
ret = (int)TEMP_FAILURE_RETRY(close(fd));
182
ret = TEMP_FAILURE_RETRY(close(fd));
298
183
if(ret == -1){
299
perror_plus("close");
184
perror("close");
300
185
}
301
186
gpgme_data_release(pgp_data);
302
187
return true;
303
188
}
304
189
305
if(debug){
306
fprintf_plus(stderr, "Initializing GPGME\n");
190
if (debug){
191
fprintf(stderr, "Initialize gpgme\n");
307
192
}
308
193
309
194
/* Init GPGME */
310
195
gpgme_check_version(NULL);
311
196
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
312
if(rc != GPG_ERR_NO_ERROR){
313
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
314
gpgme_strsource(rc), gpgme_strerror(rc));
197
if (rc != GPG_ERR_NO_ERROR){
198
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
199
gpgme_strsource(rc), gpgme_strerror(rc));
315
200
return false;
316
201
}
317
202
318
/* Set GPGME home directory for the OpenPGP engine only */
319
rc = gpgme_get_engine_info(&engine_info);
320
if(rc != GPG_ERR_NO_ERROR){
321
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
322
gpgme_strsource(rc), gpgme_strerror(rc));
203
/* Set GPGME home directory for the OpenPGP engine only */
204
rc = gpgme_get_engine_info (&engine_info);
205
if (rc != GPG_ERR_NO_ERROR){
206
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
207
gpgme_strsource(rc), gpgme_strerror(rc));
323
208
return false;
324
209
}
325
210
while(engine_info != NULL){
331
216
engine_info = engine_info->next;
332
217
}
333
218
if(engine_info == NULL){
334
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
335
tempdir);
219
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
336
220
return false;
337
221
}
338
222
339
223
/* Create new GPGME "context" */
340
224
rc = gpgme_new(&(mc->ctx));
341
if(rc != GPG_ERR_NO_ERROR){
342
fprintf_plus(stderr, "Mandos plugin mandos-client: "
343
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
344
gpgme_strerror(rc));
345
return false;
346
}
347
348
if(not import_key(pubkey) or not import_key(seckey)){
349
return false;
350
}
351
352
return true;
225
if (rc != GPG_ERR_NO_ERROR){
226
fprintf(stderr, "bad gpgme_new: %s: %s\n",
227
gpgme_strsource(rc), gpgme_strerror(rc));
228
return false;
229
}
230
231
if (not import_key(pubkey) or not import_key(seckey)){
232
return false;
233
}
234
235
return true;
353
236
}
354
237
355
238
/*
356
239
* Decrypt OpenPGP data.
357
240
* Returns -1 on error
358
241
*/
359
__attribute__((nonnull, warn_unused_result))
360
static ssize_t pgp_packet_decrypt(const char *cryptotext,
361
size_t crypto_size,
362
char **plaintext,
363
mandos_context *mc){
242
static ssize_t pgp_packet_decrypt (const mandos_context *mc,
243
const char *cryptotext,
244
size_t crypto_size,
245
char **plaintext){
364
246
gpgme_data_t dh_crypto, dh_plain;
365
247
gpgme_error_t rc;
366
248
ssize_t ret;
367
249
size_t plaintext_capacity = 0;
368
250
ssize_t plaintext_length = 0;
369
251
370
if(debug){
371
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
252
if (debug){
253
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
372
254
}
373
255
374
256
/* Create new GPGME data buffer from memory cryptotext */
375
257
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
376
258
0);
377
if(rc != GPG_ERR_NO_ERROR){
378
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
379
gpgme_strsource(rc), gpgme_strerror(rc));
259
if (rc != GPG_ERR_NO_ERROR){
260
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
261
gpgme_strsource(rc), gpgme_strerror(rc));
380
262
return -1;
381
263
}
382
264
383
265
/* Create new empty GPGME data buffer for the plaintext */
384
266
rc = gpgme_data_new(&dh_plain);
385
if(rc != GPG_ERR_NO_ERROR){
386
fprintf_plus(stderr, "Mandos plugin mandos-client: "
387
"bad gpgme_data_new: %s: %s\n",
388
gpgme_strsource(rc), gpgme_strerror(rc));
267
if (rc != GPG_ERR_NO_ERROR){
268
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
269
gpgme_strsource(rc), gpgme_strerror(rc));
389
270
gpgme_data_release(dh_crypto);
390
271
return -1;
391
272
}
393
274
/* Decrypt data from the cryptotext data buffer to the plaintext
394
275
data buffer */
395
276
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
396
if(rc != GPG_ERR_NO_ERROR){
397
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
398
gpgme_strsource(rc), gpgme_strerror(rc));
277
if (rc != GPG_ERR_NO_ERROR){
278
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
279
gpgme_strsource(rc), gpgme_strerror(rc));
399
280
plaintext_length = -1;
400
if(debug){
281
if (debug){
401
282
gpgme_decrypt_result_t result;
402
283
result = gpgme_op_decrypt_result(mc->ctx);
403
if(result == NULL){
404
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
284
if (result == NULL){
285
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
405
286
} else {
406
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
407
result->unsupported_algorithm);
408
fprintf_plus(stderr, "Wrong key usage: %u\n",
409
result->wrong_key_usage);
287
fprintf(stderr, "Unsupported algorithm: %s\n",
288
result->unsupported_algorithm);
289
fprintf(stderr, "Wrong key usage: %u\n",
290
result->wrong_key_usage);
410
291
if(result->file_name != NULL){
411
fprintf_plus(stderr, "File name: %s\n", result->file_name);
292
fprintf(stderr, "File name: %s\n", result->file_name);
412
293
}
413
294
gpgme_recipient_t recipient;
414
295
recipient = result->recipients;
415
while(recipient != NULL){
416
fprintf_plus(stderr, "Public key algorithm: %s\n",
417
gpgme_pubkey_algo_name
418
(recipient->pubkey_algo));
419
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
420
fprintf_plus(stderr, "Secret key available: %s\n",
421
recipient->status == GPG_ERR_NO_SECKEY
422
? "No" : "Yes");
423
recipient = recipient->next;
296
if(recipient){
297
while(recipient != NULL){
298
fprintf(stderr, "Public key algorithm: %s\n",
299
gpgme_pubkey_algo_name(recipient->pubkey_algo));
300
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
301
fprintf(stderr, "Secret key available: %s\n",
302
recipient->status == GPG_ERR_NO_SECKEY
303
? "No" : "Yes");
304
recipient = recipient->next;
305
}
424
306
}
425
307
}
426
308
}
428
310
}
429
311
430
312
if(debug){
431
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
313
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
432
314
}
433
315
434
316
/* Seek back to the beginning of the GPGME plaintext data buffer */
435
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
436
perror_plus("gpgme_data_seek");
317
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
318
perror("pgpme_data_seek");
437
319
plaintext_length = -1;
438
320
goto decrypt_end;
439
321
}
440
322
441
323
*plaintext = NULL;
442
324
while(true){
443
plaintext_capacity = incbuffer(plaintext,
444
(size_t)plaintext_length,
445
plaintext_capacity);
446
if(plaintext_capacity == 0){
447
perror_plus("incbuffer");
448
plaintext_length = -1;
449
goto decrypt_end;
325
plaintext_capacity = adjustbuffer(plaintext,
326
(size_t)plaintext_length,
327
plaintext_capacity);
328
if (plaintext_capacity == 0){
329
perror("adjustbuffer");
330
plaintext_length = -1;
331
goto decrypt_end;
450
332
}
451
333
452
334
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
453
335
BUFFER_SIZE);
454
336
/* Print the data, if any */
455
if(ret == 0){
337
if (ret == 0){
456
338
/* EOF */
457
339
break;
458
340
}
459
341
if(ret < 0){
460
perror_plus("gpgme_data_read");
342
perror("gpgme_data_read");
461
343
plaintext_length = -1;
462
344
goto decrypt_end;
463
345
}
465
347
}
466
348
467
349
if(debug){
468
fprintf_plus(stderr, "Decrypted password is: ");
350
fprintf(stderr, "Decrypted password is: ");
469
351
for(ssize_t i = 0; i < plaintext_length; i++){
470
352
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
471
353
}
482
364
return plaintext_length;
483
365
}
484
366
485
__attribute__((warn_unused_result))
486
static const char *safer_gnutls_strerror(int value){
487
const char *ret = gnutls_strerror(value);
488
if(ret == NULL)
367
static const char * safer_gnutls_strerror (int value) {
368
const char *ret = gnutls_strerror (value); /* Spurious warning */
369
if (ret == NULL)
489
370
ret = "(unknown)";
490
371
return ret;
491
372
}
492
373
493
374
/* GnuTLS log function callback */
494
__attribute__((nonnull))
495
375
static void debuggnutls(__attribute__((unused)) int level,
496
376
const char* string){
497
fprintf_plus(stderr, "GnuTLS: %s", string);
377
fprintf(stderr, "GnuTLS: %s", string);
498
378
}
499
379
500
__attribute__((nonnull, warn_unused_result))
501
static int init_gnutls_global(const char *pubkeyfilename,
502
const char *seckeyfilename,
503
mandos_context *mc){
380
static int init_gnutls_global(mandos_context *mc,
381
const char *pubkeyfilename,
382
const char *seckeyfilename){
504
383
int ret;
505
384
506
385
if(debug){
507
fprintf_plus(stderr, "Initializing GnuTLS\n");
386
fprintf(stderr, "Initializing GnuTLS\n");
508
387
}
509
388
510
389
ret = gnutls_global_init();
511
if(ret != GNUTLS_E_SUCCESS){
512
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
513
safer_gnutls_strerror(ret));
390
if (ret != GNUTLS_E_SUCCESS) {
391
fprintf (stderr, "GnuTLS global_init: %s\n",
392
safer_gnutls_strerror(ret));
514
393
return -1;
515
394
}
516
395
517
if(debug){
396
if (debug){
518
397
/* "Use a log level over 10 to enable all debugging options."
519
398
* - GnuTLS manual
520
399
*/
523
402
}
524
403
525
404
/* OpenPGP credentials */
526
ret = gnutls_certificate_allocate_credentials(&mc->cred);
527
if(ret != GNUTLS_E_SUCCESS){
528
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
529
safer_gnutls_strerror(ret));
530
gnutls_global_deinit();
405
gnutls_certificate_allocate_credentials(&mc->cred);
406
if (ret != GNUTLS_E_SUCCESS){
407
fprintf (stderr, "GnuTLS memory error: %s\n", /* Spurious
408
warning */
409
safer_gnutls_strerror(ret));
410
gnutls_global_deinit ();
531
411
return -1;
532
412
}
533
413
534
414
if(debug){
535
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
536
" secret key %s as GnuTLS credentials\n",
537
pubkeyfilename,
538
seckeyfilename);
415
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
416
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
417
seckeyfilename);
539
418
}
540
419
541
420
ret = gnutls_certificate_set_openpgp_key_file
542
421
(mc->cred, pubkeyfilename, seckeyfilename,
543
422
GNUTLS_OPENPGP_FMT_BASE64);
544
if(ret != GNUTLS_E_SUCCESS){
545
fprintf_plus(stderr,
546
"Error[%d] while reading the OpenPGP key pair ('%s',"
547
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
548
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
549
safer_gnutls_strerror(ret));
423
if (ret != GNUTLS_E_SUCCESS) {
424
fprintf(stderr,
425
"Error[%d] while reading the OpenPGP key pair ('%s',"
426
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
427
fprintf(stderr, "The GnuTLS error is: %s\n",
428
safer_gnutls_strerror(ret));
550
429
goto globalfail;
551
430
}
552
431
553
432
/* GnuTLS server initialization */
554
433
ret = gnutls_dh_params_init(&mc->dh_params);
555
if(ret != GNUTLS_E_SUCCESS){
556
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
557
" initialization: %s\n",
558
safer_gnutls_strerror(ret));
434
if (ret != GNUTLS_E_SUCCESS) {
435
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
436
" %s\n", safer_gnutls_strerror(ret));
559
437
goto globalfail;
560
438
}
561
439
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
562
if(ret != GNUTLS_E_SUCCESS){
563
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
564
safer_gnutls_strerror(ret));
440
if (ret != GNUTLS_E_SUCCESS) {
441
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
442
safer_gnutls_strerror(ret));
565
443
goto globalfail;
566
444
}
567
445
573
451
574
452
gnutls_certificate_free_credentials(mc->cred);
575
453
gnutls_global_deinit();
576
gnutls_dh_params_deinit(mc->dh_params);
577
454
return -1;
578
455
}
579
456
580
__attribute__((nonnull, warn_unused_result))
581
static int init_gnutls_session(gnutls_session_t *session,
582
mandos_context *mc){
457
static int init_gnutls_session(mandos_context *mc,
458
gnutls_session_t *session){
583
459
int ret;
584
460
/* GnuTLS session creation */
585
do {
586
ret = gnutls_init(session, GNUTLS_SERVER);
587
if(quit_now){
588
return -1;
589
}
590
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
591
if(ret != GNUTLS_E_SUCCESS){
592
fprintf_plus(stderr,
593
"Error in GnuTLS session initialization: %s\n",
594
safer_gnutls_strerror(ret));
461
ret = gnutls_init(session, GNUTLS_SERVER);
462
if (ret != GNUTLS_E_SUCCESS){
463
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
464
safer_gnutls_strerror(ret));
595
465
}
596
466
597
467
{
598
468
const char *err;
599
do {
600
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
601
if(quit_now){
602
gnutls_deinit(*session);
603
return -1;
604
}
605
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
606
if(ret != GNUTLS_E_SUCCESS){
607
fprintf_plus(stderr, "Syntax error at: %s\n", err);
608
fprintf_plus(stderr, "GnuTLS error: %s\n",
609
safer_gnutls_strerror(ret));
610
gnutls_deinit(*session);
469
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
470
if (ret != GNUTLS_E_SUCCESS) {
471
fprintf(stderr, "Syntax error at: %s\n", err);
472
fprintf(stderr, "GnuTLS error: %s\n",
473
safer_gnutls_strerror(ret));
474
gnutls_deinit (*session);
611
475
return -1;
612
476
}
613
477
}
614
478
615
do {
616
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
617
mc->cred);
618
if(quit_now){
619
gnutls_deinit(*session);
620
return -1;
621
}
622
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
623
if(ret != GNUTLS_E_SUCCESS){
624
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
625
safer_gnutls_strerror(ret));
626
gnutls_deinit(*session);
479
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
480
mc->cred);
481
if (ret != GNUTLS_E_SUCCESS) {
482
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
483
safer_gnutls_strerror(ret));
484
gnutls_deinit (*session);
627
485
return -1;
628
486
}
629
487
630
488
/* ignore client certificate if any. */
631
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
489
gnutls_certificate_server_set_request (*session,
490
GNUTLS_CERT_IGNORE);
632
491
633
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
492
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
634
493
635
494
return 0;
636
495
}
640
499
__attribute__((unused)) const char *txt){}
641
500
642
501
/* Called when a Mandos server is found */
643
__attribute__((nonnull, warn_unused_result))
644
static int start_mandos_communication(const char *ip, in_port_t port,
502
static int start_mandos_communication(const char *ip, uint16_t port,
645
503
AvahiIfIndex if_index,
646
int af, mandos_context *mc){
647
int ret, tcp_sd = -1;
648
ssize_t sret;
649
struct sockaddr_storage to;
504
mandos_context *mc){
505
int ret, tcp_sd;
506
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
650
507
char *buffer = NULL;
651
char *decrypted_buffer = NULL;
508
char *decrypted_buffer;
652
509
size_t buffer_length = 0;
653
510
size_t buffer_capacity = 0;
511
ssize_t decrypted_buffer_size;
654
512
size_t written;
655
int retval = -1;
513
int retval = 0;
514
char interface[IF_NAMESIZE];
656
515
gnutls_session_t session;
657
int pf; /* Protocol family */
658
659
errno = 0;
660
661
if(quit_now){
662
errno = EINTR;
663
return -1;
664
}
665
666
switch(af){
667
case AF_INET6:
668
pf = PF_INET6;
669
break;
670
case AF_INET:
671
pf = PF_INET;
672
break;
673
default:
674
fprintf_plus(stderr, "Bad address family: %d\n", af);
675
errno = EINVAL;
676
return -1;
677
}
678
679
/* If the interface is specified and we have a list of interfaces */
680
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
681
/* Check if the interface is one of the interfaces we are using */
682
bool match = false;
683
{
684
char *interface = NULL;
685
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
686
interface))){
687
if(if_nametoindex(interface) == (unsigned int)if_index){
688
match = true;
689
break;
690
}
691
}
692
}
693
if(not match){
694
/* This interface does not match any in the list, so we don't
695
connect to the server */
696
if(debug){
697
char interface[IF_NAMESIZE];
698
if(if_indextoname((unsigned int)if_index, interface) == NULL){
699
perror_plus("if_indextoname");
700
} else {
701
fprintf_plus(stderr, "Skipping server on non-used interface"
702
" \"%s\"\n",
703
if_indextoname((unsigned int)if_index,
704
interface));
705
}
706
}
516
517
ret = init_gnutls_session (mc, &session);
518
if (ret != 0){
519
return -1;
520
}
521
522
if(debug){
523
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
524
"\n", ip, port);
525
}
526
527
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
528
if(tcp_sd < 0) {
529
perror("socket");
530
return -1;
531
}
532
533
if(debug){
534
if(if_indextoname((unsigned int)if_index, interface) == NULL){
535
perror("if_indextoname");
707
536
return -1;
708
537
}
709
}
710
711
ret = init_gnutls_session(&session, mc);
712
if(ret != 0){
713
return -1;
714
}
715
716
if(debug){
717
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
718
PRIuMAX "\n", ip, (uintmax_t)port);
719
}
720
721
tcp_sd = socket(pf, SOCK_STREAM, 0);
722
if(tcp_sd < 0){
723
int e = errno;
724
perror_plus("socket");
725
errno = e;
726
goto mandos_end;
727
}
728
729
if(quit_now){
730
errno = EINTR;
731
goto mandos_end;
538
fprintf(stderr, "Binding to interface %s\n", interface);
732
539
}
733
540
734
541
memset(&to, 0, sizeof(to));
735
if(af == AF_INET6){
736
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
737
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
738
} else { /* IPv4 */
739
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
740
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
741
}
742
if(ret < 0 ){
743
int e = errno;
744
perror_plus("inet_pton");
745
errno = e;
746
goto mandos_end;
542
to.in6.sin6_family = AF_INET6;
543
/* It would be nice to have a way to detect if we were passed an
544
IPv4 address here. Now we assume an IPv6 address. */
545
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
546
if (ret < 0 ){
547
perror("inet_pton");
548
return -1;
747
549
}
748
550
if(ret == 0){
749
int e = errno;
750
fprintf_plus(stderr, "Bad address: %s\n", ip);
751
errno = e;
752
goto mandos_end;
753
}
754
if(af == AF_INET6){
755
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
756
if(IN6_IS_ADDR_LINKLOCAL
757
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
758
if(if_index == AVAHI_IF_UNSPEC){
759
fprintf_plus(stderr, "An IPv6 link-local address is"
760
" incomplete without a network interface\n");
761
errno = EINVAL;
762
goto mandos_end;
763
}
764
/* Set the network interface number as scope */
765
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
766
}
767
} else {
768
((struct sockaddr_in *)&to)->sin_port = htons(port);
769
}
551
fprintf(stderr, "Bad address: %s\n", ip);
552
return -1;
553
}
554
to.in6.sin6_port = htons(port); /* Spurious warning */
770
555
771
if(quit_now){
772
errno = EINTR;
773
goto mandos_end;
774
}
556
to.in6.sin6_scope_id = (uint32_t)if_index;
775
557
776
558
if(debug){
777
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
778
char interface[IF_NAMESIZE];
779
if(if_indextoname((unsigned int)if_index, interface) == NULL){
780
perror_plus("if_indextoname");
781
} else {
782
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
783
"\n", ip, interface, (uintmax_t)port);
559
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
560
port);
561
char addrstr[INET6_ADDRSTRLEN] = "";
562
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
563
sizeof(addrstr)) == NULL){
564
perror("inet_ntop");
565
} else {
566
if(strcmp(addrstr, ip) != 0){
567
fprintf(stderr, "Canonical address form: %s\n", addrstr);
784
568
}
785
} else {
786
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
787
ip, (uintmax_t)port);
788
}
789
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
790
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
791
if(af == AF_INET6){
792
ret = getnameinfo((struct sockaddr *)&to,
793
sizeof(struct sockaddr_in6),
794
addrstr, sizeof(addrstr), NULL, 0,
795
NI_NUMERICHOST);
796
} else {
797
ret = getnameinfo((struct sockaddr *)&to,
798
sizeof(struct sockaddr_in),
799
addrstr, sizeof(addrstr), NULL, 0,
800
NI_NUMERICHOST);
801
}
802
if(ret == EAI_SYSTEM){
803
perror_plus("getnameinfo");
804
} else if(ret != 0) {
805
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
806
} else if(strcmp(addrstr, ip) != 0){
807
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
808
}
809
}
810
811
if(quit_now){
812
errno = EINTR;
813
goto mandos_end;
814
}
815
816
if(af == AF_INET6){
817
ret = connect(tcp_sd, (struct sockaddr *)&to,
818
sizeof(struct sockaddr_in6));
819
} else {
820
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
821
sizeof(struct sockaddr_in));
822
}
823
if(ret < 0){
824
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
825
int e = errno;
826
perror_plus("connect");
827
errno = e;
828
}
829
goto mandos_end;
830
}
831
832
if(quit_now){
833
errno = EINTR;
834
goto mandos_end;
569
}
570
}
571
572
ret = connect(tcp_sd, &to.in, sizeof(to));
573
if (ret < 0){
574
perror("connect");
575
return -1;
835
576
}
836
577
837
578
const char *out = mandos_protocol_version;
838
579
written = 0;
839
while(true){
580
while (true){
840
581
size_t out_size = strlen(out);
841
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
842
out_size - written));
843
if(ret == -1){
844
int e = errno;
845
perror_plus("write");
846
errno = e;
582
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
583
out_size - written));
584
if (ret == -1){
585
perror("write");
586
retval = -1;
847
587
goto mandos_end;
848
588
}
849
589
written += (size_t)ret;
850
590
if(written < out_size){
851
591
continue;
852
592
} else {
853
if(out == mandos_protocol_version){
593
if (out == mandos_protocol_version){
854
594
written = 0;
855
595
out = "\r\n";
856
596
} else {
857
597
break;
858
598
}
859
599
}
860
861
if(quit_now){
862
errno = EINTR;
863
goto mandos_end;
864
}
865
600
}
866
601
867
602
if(debug){
868
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
869
}
870
871
if(quit_now){
872
errno = EINTR;
873
goto mandos_end;
874
}
875
876
/* This casting via intptr_t is to eliminate warning about casting
877
an int to a pointer type. This is exactly how the GnuTLS Guile
878
function "set-session-transport-fd!" does it. */
879
gnutls_transport_set_ptr(session,
880
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
881
882
if(quit_now){
883
errno = EINTR;
884
goto mandos_end;
885
}
886
887
do {
888
ret = gnutls_handshake(session);
889
if(quit_now){
890
errno = EINTR;
891
goto mandos_end;
892
}
603
fprintf(stderr, "Establishing TLS session with %s\n", ip);
604
}
605
606
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
607
608
do{
609
ret = gnutls_handshake (session);
893
610
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
894
611
895
if(ret != GNUTLS_E_SUCCESS){
612
if (ret != GNUTLS_E_SUCCESS){
896
613
if(debug){
897
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
898
gnutls_perror(ret);
614
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
615
gnutls_perror (ret);
899
616
}
900
errno = EPROTO;
617
retval = -1;
901
618
goto mandos_end;
902
619
}
903
620
904
621
/* Read OpenPGP packet that contains the wanted password */
905
622
906
623
if(debug){
907
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
908
" %s\n", ip);
624
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
625
ip);
909
626
}
910
627
911
628
while(true){
912
913
if(quit_now){
914
errno = EINTR;
915
goto mandos_end;
916
}
917
918
buffer_capacity = incbuffer(&buffer, buffer_length,
919
buffer_capacity);
920
if(buffer_capacity == 0){
921
int e = errno;
922
perror_plus("incbuffer");
923
errno = e;
924
goto mandos_end;
925
}
926
927
if(quit_now){
928
errno = EINTR;
929
goto mandos_end;
930
}
931
932
sret = gnutls_record_recv(session, buffer+buffer_length,
933
BUFFER_SIZE);
934
if(sret == 0){
629
buffer_capacity = adjustbuffer(&buffer, buffer_length,
630
buffer_capacity);
631
if (buffer_capacity == 0){
632
perror("adjustbuffer");
633
retval = -1;
634
goto mandos_end;
635
}
636
637
ret = gnutls_record_recv(session, buffer+buffer_length,
638
BUFFER_SIZE);
639
if (ret == 0){
935
640
break;
936
641
}
937
if(sret < 0){
938
switch(sret){
642
if (ret < 0){
643
switch(ret){
939
644
case GNUTLS_E_INTERRUPTED:
940
645
case GNUTLS_E_AGAIN:
941
646
break;
942
647
case GNUTLS_E_REHANDSHAKE:
943
do {
944
ret = gnutls_handshake(session);
945
946
if(quit_now){
947
errno = EINTR;
948
goto mandos_end;
949
}
648
do{
649
ret = gnutls_handshake (session);
950
650
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
951
if(ret < 0){
952
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
953
"***\n");
954
gnutls_perror(ret);
955
errno = EPROTO;
651
if (ret < 0){
652
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
653
gnutls_perror (ret);
654
retval = -1;
956
655
goto mandos_end;
957
656
}
958
657
break;
959
658
default:
960
fprintf_plus(stderr, "Unknown error while reading data from"
961
" encrypted session with Mandos server\n");
962
gnutls_bye(session, GNUTLS_SHUT_RDWR);
963
errno = EIO;
659
fprintf(stderr, "Unknown error while reading data from"
660
" encrypted session with Mandos server\n");
661
retval = -1;
662
gnutls_bye (session, GNUTLS_SHUT_RDWR);
964
663
goto mandos_end;
965
664
}
966
665
} else {
967
buffer_length += (size_t) sret;
666
buffer_length += (size_t) ret;
968
667
}
969
668
}
970
669
971
670
if(debug){
972
fprintf_plus(stderr, "Closing TLS session\n");
973
}
974
975
if(quit_now){
976
errno = EINTR;
977
goto mandos_end;
978
}
979
980
do {
981
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
982
if(quit_now){
983
errno = EINTR;
984
goto mandos_end;
985
}
986
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
987
988
if(buffer_length > 0){
989
ssize_t decrypted_buffer_size;
990
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
991
&decrypted_buffer, mc);
992
if(decrypted_buffer_size >= 0){
993
671
fprintf(stderr, "Closing TLS session\n");
672
}
673
674
gnutls_bye (session, GNUTLS_SHUT_RDWR);
675
676
if (buffer_length > 0){
677
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
678
buffer_length,
679
&decrypted_buffer);
680
if (decrypted_buffer_size >= 0){
994
681
written = 0;
995
682
while(written < (size_t) decrypted_buffer_size){
996
if(quit_now){
997
errno = EINTR;
998
goto mandos_end;
999
}
1000
1001
ret = (int)fwrite(decrypted_buffer + written, 1,
1002
(size_t)decrypted_buffer_size - written,
1003
stdout);
683
ret = (int)fwrite (decrypted_buffer + written, 1,
684
(size_t)decrypted_buffer_size - written,
685
stdout);
1004
686
if(ret == 0 and ferror(stdout)){
1005
int e = errno;
1006
687
if(debug){
1007
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1008
strerror(errno));
688
fprintf(stderr, "Error writing encrypted data: %s\n",
689
strerror(errno));
1009
690
}
1010
errno = e;
1011
goto mandos_end;
691
retval = -1;
692
break;
1012
693
}
1013
694
written += (size_t)ret;
1014
695
}
1015
retval = 0;
696
free(decrypted_buffer);
697
} else {
698
retval = -1;
1016
699
}
700
} else {
701
retval = -1;
1017
702
}
1018
703
1019
704
/* Shutdown procedure */
1020
705
1021
706
mandos_end:
1022
{
1023
int e = errno;
1024
free(decrypted_buffer);
1025
free(buffer);
1026
if(tcp_sd >= 0){
1027
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1028
}
1029
if(ret == -1){
1030
if(e == 0){
1031
e = errno;
1032
}
1033
perror_plus("close");
1034
}
1035
gnutls_deinit(session);
1036
errno = e;
1037
if(quit_now){
1038
errno = EINTR;
1039
retval = -1;
1040
}
707
free(buffer);
708
ret = TEMP_FAILURE_RETRY(close(tcp_sd));
709
if(ret == -1){
710
perror("close");
1041
711
}
712
gnutls_deinit (session);
1042
713
return retval;
1043
714
}
1044
715
1045
__attribute__((nonnull))
1046
716
static void resolve_callback(AvahiSServiceResolver *r,
1047
717
AvahiIfIndex interface,
1048
AvahiProtocol proto,
718
AVAHI_GCC_UNUSED AvahiProtocol protocol,
1049
719
AvahiResolverEvent event,
1050
720
const char *name,
1051
721
const char *type,
1056
726
AVAHI_GCC_UNUSED AvahiStringList *txt,
1057
727
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1058
728
flags,
1059
void *mc){
1060
if(r == NULL){
1061
return;
1062
}
729
void* userdata) {
730
mandos_context *mc = userdata;
731
assert(r);
1063
732
1064
733
/* Called whenever a service has been resolved successfully or
1065
734
timed out */
1066
735
1067
if(quit_now){
1068
return;
1069
}
1070
1071
switch(event){
736
switch (event) {
1072
737
default:
1073
738
case AVAHI_RESOLVER_FAILURE:
1074
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1075
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1076
domain,
1077
avahi_strerror(avahi_server_errno
1078
(((mandos_context*)mc)->server)));
739
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
740
" of type '%s' in domain '%s': %s\n", name, type, domain,
741
avahi_strerror(avahi_server_errno(mc->server)));
1079
742
break;
1080
743
1081
744
case AVAHI_RESOLVER_FOUND:
1083
746
char ip[AVAHI_ADDRESS_STR_MAX];
1084
747
avahi_address_snprint(ip, sizeof(ip), address);
1085
748
if(debug){
1086
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1087
PRIdMAX ") on port %" PRIu16 "\n", name,
1088
host_name, ip, (intmax_t)interface, port);
749
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
750
PRIu16 ") on port %d\n", name, host_name, ip,
751
interface, port);
1089
752
}
1090
int ret = start_mandos_communication(ip, (in_port_t)port,
1091
interface,
1092
avahi_proto_to_af(proto),
1093
mc);
1094
if(ret == 0){
1095
avahi_simple_poll_quit(simple_poll);
1096
} else {
1097
if(not add_server(ip, (in_port_t)port, interface,
1098
avahi_proto_to_af(proto),
1099
&((mandos_context*)mc)->current_server)){
1100
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1101
" list\n", name);
1102
}
753
int ret = start_mandos_communication(ip, port, interface, mc);
754
if (ret == 0){
755
avahi_simple_poll_quit(mc->simple_poll);
1103
756
}
1104
757
}
1105
758
}
1106
759
avahi_s_service_resolver_free(r);
1107
760
}
1108
761
1109
static void browse_callback(AvahiSServiceBrowser *b,
1110
AvahiIfIndex interface,
1111
AvahiProtocol protocol,
1112
AvahiBrowserEvent event,
1113
const char *name,
1114
const char *type,
1115
const char *domain,
1116
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1117
flags,
1118
void *mc){
1119
if(b == NULL){
1120
return;
1121
}
762
static void browse_callback( AvahiSServiceBrowser *b,
763
AvahiIfIndex interface,
764
AvahiProtocol protocol,
765
AvahiBrowserEvent event,
766
const char *name,
767
const char *type,
768
const char *domain,
769
AVAHI_GCC_UNUSED AvahiLookupResultFlags
770
flags,
771
void* userdata) {
772
mandos_context *mc = userdata;
773
assert(b);
1122
774
1123
775
/* Called whenever a new services becomes available on the LAN or
1124
776
is removed from the LAN */
1125
777
1126
if(quit_now){
1127
return;
1128
}
1129
1130
switch(event){
778
switch (event) {
1131
779
default:
1132
780
case AVAHI_BROWSER_FAILURE:
1133
781
1134
fprintf_plus(stderr, "(Avahi browser) %s\n",
1135
avahi_strerror(avahi_server_errno
1136
(((mandos_context*)mc)->server)));
1137
avahi_simple_poll_quit(simple_poll);
782
fprintf(stderr, "(Avahi browser) %s\n",
783
avahi_strerror(avahi_server_errno(mc->server)));
784
avahi_simple_poll_quit(mc->simple_poll);
1138
785
return;
1139
786
1140
787
case AVAHI_BROWSER_NEW:
1143
790
the callback function is called the Avahi server will free the
1144
791
resolver for us. */
1145
792
1146
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1147
interface, protocol, name, type,
1148
domain, protocol, 0,
1149
resolve_callback, mc) == NULL)
1150
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1151
" %s\n", name,
1152
avahi_strerror(avahi_server_errno
1153
(((mandos_context*)mc)->server)));
793
if (!(avahi_s_service_resolver_new(mc->server, interface,
794
protocol, name, type, domain,
795
AVAHI_PROTO_INET6, 0,
796
resolve_callback, mc)))
797
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
798
name, avahi_strerror(avahi_server_errno(mc->server)));
1154
799
break;
1155
800
1156
801
case AVAHI_BROWSER_REMOVE:
1159
804
case AVAHI_BROWSER_ALL_FOR_NOW:
1160
805
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1161
806
if(debug){
1162
fprintf_plus(stderr, "No Mandos server found, still"
1163
" searching...\n");
807
fprintf(stderr, "No Mandos server found, still searching...\n");
1164
808
}
1165
809
break;
1166
810
}
1167
811
}
1168
812
1169
/* Signal handler that stops main loop after SIGTERM */
1170
static void handle_sigterm(int sig){
1171
if(quit_now){
1172
return;
1173
}
1174
quit_now = 1;
1175
signal_received = sig;
1176
int old_errno = errno;
1177
/* set main loop to exit */
1178
if(simple_poll != NULL){
1179
avahi_simple_poll_quit(simple_poll);
1180
}
1181
errno = old_errno;
1182
}
1183
1184
__attribute__((nonnull, warn_unused_result))
1185
bool get_flags(const char *ifname, struct ifreq *ifr){
1186
int ret;
1187
error_t ret_errno;
1188
1189
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1190
if(s < 0){
1191
ret_errno = errno;
1192
perror_plus("socket");
1193
errno = ret_errno;
1194
return false;
1195
}
1196
strcpy(ifr->ifr_name, ifname);
1197
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1198
if(ret == -1){
1199
if(debug){
1200
ret_errno = errno;
1201
perror_plus("ioctl SIOCGIFFLAGS");
1202
errno = ret_errno;
1203
}
1204
return false;
1205
}
1206
return true;
1207
}
1208
1209
__attribute__((nonnull, warn_unused_result))
1210
bool good_flags(const char *ifname, const struct ifreq *ifr){
1211
1212
/* Reject the loopback device */
1213
if(ifr->ifr_flags & IFF_LOOPBACK){
1214
if(debug){
1215
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1216
ifname);
1217
}
1218
return false;
1219
}
1220
/* Accept point-to-point devices only if connect_to is specified */
1221
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1222
if(debug){
1223
fprintf_plus(stderr, "Accepting point-to-point interface"
1224
" \"%s\"\n", ifname);
1225
}
1226
return true;
1227
}
1228
/* Otherwise, reject non-broadcast-capable devices */
1229
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1230
if(debug){
1231
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1232
" \"%s\"\n", ifname);
1233
}
1234
return false;
1235
}
1236
/* Reject non-ARP interfaces (including dummy interfaces) */
1237
if(ifr->ifr_flags & IFF_NOARP){
1238
if(debug){
1239
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1240
ifname);
1241
}
1242
return false;
1243
}
1244
1245
/* Accept this device */
1246
if(debug){
1247
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1248
}
1249
return true;
1250
}
1251
1252
/*
1253
* This function determines if a directory entry in /sys/class/net
1254
* corresponds to an acceptable network device.
1255
* (This function is passed to scandir(3) as a filter function.)
1256
*/
1257
__attribute__((nonnull, warn_unused_result))
1258
int good_interface(const struct dirent *if_entry){
1259
if(if_entry->d_name[0] == '.'){
1260
return 0;
1261
}
1262
1263
struct ifreq ifr;
1264
if(not get_flags(if_entry->d_name, &ifr)){
1265
if(debug){
1266
fprintf_plus(stderr, "Failed to get flags for interface "
1267
"\"%s\"\n", if_entry->d_name);
1268
}
1269
return 0;
1270
}
1271
1272
if(not good_flags(if_entry->d_name, &ifr)){
1273
return 0;
1274
}
1275
return 1;
1276
}
1277
1278
/*
1279
* This function determines if a network interface is up.
1280
*/
1281
__attribute__((nonnull, warn_unused_result))
1282
bool interface_is_up(const char *interface){
1283
struct ifreq ifr;
1284
if(not get_flags(interface, &ifr)){
1285
if(debug){
1286
fprintf_plus(stderr, "Failed to get flags for interface "
1287
"\"%s\"\n", interface);
1288
}
1289
return false;
1290
}
1291
1292
return (bool)(ifr.ifr_flags & IFF_UP);
1293
}
1294
1295
/*
1296
* This function determines if a network interface is running
1297
*/
1298
__attribute__((nonnull, warn_unused_result))
1299
bool interface_is_running(const char *interface){
1300
struct ifreq ifr;
1301
if(not get_flags(interface, &ifr)){
1302
if(debug){
1303
fprintf_plus(stderr, "Failed to get flags for interface "
1304
"\"%s\"\n", interface);
1305
}
1306
return false;
1307
}
1308
1309
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1310
}
1311
1312
__attribute__((nonnull, pure, warn_unused_result))
1313
int notdotentries(const struct dirent *direntry){
1314
/* Skip "." and ".." */
1315
if(direntry->d_name[0] == '.'
1316
and (direntry->d_name[1] == '\0'
1317
or (direntry->d_name[1] == '.'
1318
and direntry->d_name[2] == '\0'))){
1319
return 0;
1320
}
1321
return 1;
1322
}
1323
1324
/* Is this directory entry a runnable program? */
1325
__attribute__((nonnull, warn_unused_result))
1326
int runnable_hook(const struct dirent *direntry){
1327
int ret;
1328
size_t sret;
1329
struct stat st;
1330
1331
if((direntry->d_name)[0] == '\0'){
1332
/* Empty name? */
1333
return 0;
1334
}
1335
1336
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1337
"abcdefghijklmnopqrstuvwxyz"
1338
"0123456789"
1339
"_.-");
1340
if((direntry->d_name)[sret] != '\0'){
1341
/* Contains non-allowed characters */
1342
if(debug){
1343
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1344
direntry->d_name);
1345
}
1346
return 0;
1347
}
1348
1349
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1350
if(ret == -1){
1351
if(debug){
1352
perror_plus("Could not stat hook");
1353
}
1354
return 0;
1355
}
1356
if(not (S_ISREG(st.st_mode))){
1357
/* Not a regular file */
1358
if(debug){
1359
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1360
direntry->d_name);
1361
}
1362
return 0;
1363
}
1364
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1365
/* Not executable */
1366
if(debug){
1367
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1368
direntry->d_name);
1369
}
1370
return 0;
1371
}
1372
if(debug){
1373
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1374
direntry->d_name);
1375
}
1376
return 1;
1377
}
1378
1379
__attribute__((nonnull, warn_unused_result))
1380
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1381
mandos_context *mc){
1382
int ret;
1383
struct timespec now;
1384
struct timespec waited_time;
1385
intmax_t block_time;
1386
1387
while(true){
1388
if(mc->current_server == NULL){
1389
if(debug){
1390
fprintf_plus(stderr, "Wait until first server is found."
1391
" No timeout!\n");
1392
}
1393
ret = avahi_simple_poll_iterate(s, -1);
1394
} else {
1395
if(debug){
1396
fprintf_plus(stderr, "Check current_server if we should run"
1397
" it, or wait\n");
1398
}
1399
/* the current time */
1400
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1401
if(ret == -1){
1402
perror_plus("clock_gettime");
1403
return -1;
1404
}
1405
/* Calculating in ms how long time between now and server
1406
who we visted longest time ago. Now - last seen. */
1407
waited_time.tv_sec = (now.tv_sec
1408
- mc->current_server->last_seen.tv_sec);
1409
waited_time.tv_nsec = (now.tv_nsec
1410
- mc->current_server->last_seen.tv_nsec);
1411
/* total time is 10s/10,000ms.
1412
Converting to s from ms by dividing by 1,000,
1413
and ns to ms by dividing by 1,000,000. */
1414
block_time = ((retry_interval
1415
- ((intmax_t)waited_time.tv_sec * 1000))
1416
- ((intmax_t)waited_time.tv_nsec / 1000000));
1417
1418
if(debug){
1419
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1420
block_time);
1421
}
1422
1423
if(block_time <= 0){
1424
ret = start_mandos_communication(mc->current_server->ip,
1425
mc->current_server->port,
1426
mc->current_server->if_index,
1427
mc->current_server->af, mc);
1428
if(ret == 0){
1429
avahi_simple_poll_quit(s);
1430
return 0;
1431
}
1432
ret = clock_gettime(CLOCK_MONOTONIC,
1433
&mc->current_server->last_seen);
1434
if(ret == -1){
1435
perror_plus("clock_gettime");
1436
return -1;
1437
}
1438
mc->current_server = mc->current_server->next;
1439
block_time = 0; /* Call avahi to find new Mandos
1440
servers, but don't block */
1441
}
1442
1443
ret = avahi_simple_poll_iterate(s, (int)block_time);
1444
}
1445
if(ret != 0){
1446
if(ret > 0 or errno != EINTR){
1447
return (ret != 1) ? ret : 0;
1448
}
1449
}
1450
}
1451
}
1452
1453
/* Set effective uid to 0, return errno */
1454
__attribute__((warn_unused_result))
1455
error_t raise_privileges(void){
1456
error_t old_errno = errno;
1457
error_t ret_errno = 0;
1458
if(seteuid(0) == -1){
1459
ret_errno = errno;
1460
perror_plus("seteuid");
1461
}
1462
errno = old_errno;
1463
return ret_errno;
1464
}
1465
1466
/* Set effective and real user ID to 0. Return errno. */
1467
__attribute__((warn_unused_result))
1468
error_t raise_privileges_permanently(void){
1469
error_t old_errno = errno;
1470
error_t ret_errno = raise_privileges();
1471
if(ret_errno != 0){
1472
errno = old_errno;
1473
return ret_errno;
1474
}
1475
if(setuid(0) == -1){
1476
ret_errno = errno;
1477
perror_plus("seteuid");
1478
}
1479
errno = old_errno;
1480
return ret_errno;
1481
}
1482
1483
/* Set effective user ID to unprivileged saved user ID */
1484
__attribute__((warn_unused_result))
1485
error_t lower_privileges(void){
1486
error_t old_errno = errno;
1487
error_t ret_errno = 0;
1488
if(seteuid(uid) == -1){
1489
ret_errno = errno;
1490
perror_plus("seteuid");
1491
}
1492
errno = old_errno;
1493
return ret_errno;
1494
}
1495
1496
/* Lower privileges permanently */
1497
__attribute__((warn_unused_result))
1498
error_t lower_privileges_permanently(void){
1499
error_t old_errno = errno;
1500
error_t ret_errno = 0;
1501
if(setuid(uid) == -1){
1502
ret_errno = errno;
1503
perror_plus("setuid");
1504
}
1505
errno = old_errno;
1506
return ret_errno;
1507
}
1508
1509
#ifndef O_CLOEXEC
1510
/*
1511
* Based on the example in the GNU LibC manual chapter 13.13 "File
1512
* Descriptor Flags".
1513
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
1514
*/
1515
__attribute__((warn_unused_result))
1516
static int set_cloexec_flag(int fd){
1517
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
1518
/* If reading the flags failed, return error indication now. */
1519
if(ret < 0){
1520
return ret;
1521
}
1522
/* Store modified flag word in the descriptor. */
1523
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
1524
ret | FD_CLOEXEC));
1525
}
1526
#endif /* not O_CLOEXEC */
1527
1528
__attribute__((nonnull))
1529
void run_network_hooks(const char *mode, const char *interface,
1530
const float delay){
1531
struct dirent **direntries;
1532
if(hookdir_fd == -1){
1533
hookdir_fd = open(hookdir, O_RDONLY |
1534
#ifdef O_CLOEXEC
1535
O_CLOEXEC
1536
#else /* not O_CLOEXEC */
1537
0
1538
#endif /* not O_CLOEXEC */
1539
);
1540
if(hookdir_fd == -1){
1541
if(errno == ENOENT){
1542
if(debug){
1543
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1544
" found\n", hookdir);
1545
}
1546
} else {
1547
perror_plus("open");
1548
}
1549
return;
1550
}
1551
#ifndef O_CLOEXEC
1552
if(set_cloexec_flag(hookdir_fd) < 0){
1553
perror_plus("set_cloexec_flag");
1554
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1555
perror_plus("close");
1556
} else {
1557
hookdir_fd = -1;
1558
}
1559
return;
1560
}
1561
#endif /* not O_CLOEXEC */
1562
}
1563
#ifdef __GLIBC__
1564
#if __GLIBC_PREREQ(2, 15)
1565
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1566
runnable_hook, alphasort);
1567
#else /* not __GLIBC_PREREQ(2, 15) */
1568
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1569
alphasort);
1570
#endif /* not __GLIBC_PREREQ(2, 15) */
1571
#else /* not __GLIBC__ */
1572
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1573
alphasort);
1574
#endif /* not __GLIBC__ */
1575
if(numhooks == -1){
1576
perror_plus("scandir");
1577
return;
1578
}
1579
struct dirent *direntry;
1580
int ret;
1581
int devnull = open("/dev/null", O_RDONLY);
1582
for(int i = 0; i < numhooks; i++){
1583
direntry = direntries[i];
1584
if(debug){
1585
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1586
direntry->d_name);
1587
}
1588
pid_t hook_pid = fork();
1589
if(hook_pid == 0){
1590
/* Child */
1591
/* Raise privileges */
1592
if(raise_privileges_permanently() != 0){
1593
perror_plus("Failed to raise privileges");
1594
_exit(EX_NOPERM);
1595
}
1596
/* Set group */
1597
errno = 0;
1598
ret = setgid(0);
1599
if(ret == -1){
1600
perror_plus("setgid");
1601
_exit(EX_NOPERM);
1602
}
1603
/* Reset supplementary groups */
1604
errno = 0;
1605
ret = setgroups(0, NULL);
1606
if(ret == -1){
1607
perror_plus("setgroups");
1608
_exit(EX_NOPERM);
1609
}
1610
ret = dup2(devnull, STDIN_FILENO);
1611
if(ret == -1){
1612
perror_plus("dup2(devnull, STDIN_FILENO)");
1613
_exit(EX_OSERR);
1614
}
1615
ret = close(devnull);
1616
if(ret == -1){
1617
perror_plus("close");
1618
_exit(EX_OSERR);
1619
}
1620
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1621
if(ret == -1){
1622
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1623
_exit(EX_OSERR);
1624
}
1625
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1626
if(ret == -1){
1627
perror_plus("setenv");
1628
_exit(EX_OSERR);
1629
}
1630
ret = setenv("DEVICE", interface, 1);
1631
if(ret == -1){
1632
perror_plus("setenv");
1633
_exit(EX_OSERR);
1634
}
1635
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1636
if(ret == -1){
1637
perror_plus("setenv");
1638
_exit(EX_OSERR);
1639
}
1640
ret = setenv("MODE", mode, 1);
1641
if(ret == -1){
1642
perror_plus("setenv");
1643
_exit(EX_OSERR);
1644
}
1645
char *delaystring;
1646
ret = asprintf(&delaystring, "%f", (double)delay);
1647
if(ret == -1){
1648
perror_plus("asprintf");
1649
_exit(EX_OSERR);
1650
}
1651
ret = setenv("DELAY", delaystring, 1);
1652
if(ret == -1){
1653
free(delaystring);
1654
perror_plus("setenv");
1655
_exit(EX_OSERR);
1656
}
1657
free(delaystring);
1658
if(connect_to != NULL){
1659
ret = setenv("CONNECT", connect_to, 1);
1660
if(ret == -1){
1661
perror_plus("setenv");
1662
_exit(EX_OSERR);
1663
}
1664
}
1665
if(fexecve(hookdir_fd, (char *const [])
1666
{ direntry->d_name, NULL }, environ) == -1){
1667
perror_plus("fexecve");
1668
_exit(EXIT_FAILURE);
1669
}
1670
} else {
1671
int status;
1672
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1673
perror_plus("waitpid");
1674
continue;
1675
}
1676
if(WIFEXITED(status)){
1677
if(WEXITSTATUS(status) != 0){
1678
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1679
" with status %d\n", direntry->d_name,
1680
WEXITSTATUS(status));
1681
continue;
1682
}
1683
} else if(WIFSIGNALED(status)){
1684
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1685
" signal %d\n", direntry->d_name,
1686
WTERMSIG(status));
1687
continue;
1688
} else {
1689
fprintf_plus(stderr, "Warning: network hook \"%s\""
1690
" crashed\n", direntry->d_name);
1691
continue;
1692
}
1693
}
1694
if(debug){
1695
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1696
direntry->d_name);
1697
}
1698
}
1699
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1700
perror_plus("close");
1701
} else {
1702
hookdir_fd = -1;
1703
}
1704
close(devnull);
1705
}
1706
1707
__attribute__((nonnull, warn_unused_result))
1708
error_t bring_up_interface(const char *const interface,
1709
const float delay){
1710
error_t old_errno = errno;
1711
int ret;
1712
struct ifreq network;
1713
unsigned int if_index = if_nametoindex(interface);
1714
if(if_index == 0){
1715
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1716
errno = old_errno;
1717
return ENXIO;
1718
}
1719
1720
if(quit_now){
1721
errno = old_errno;
1722
return EINTR;
1723
}
1724
1725
if(not interface_is_up(interface)){
1726
error_t ret_errno = 0, ioctl_errno = 0;
1727
if(not get_flags(interface, &network)){
1728
ret_errno = errno;
1729
fprintf_plus(stderr, "Failed to get flags for interface "
1730
"\"%s\"\n", interface);
1731
errno = old_errno;
1732
return ret_errno;
1733
}
1734
network.ifr_flags |= IFF_UP; /* set flag */
1735
1736
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1737
if(sd == -1){
1738
ret_errno = errno;
1739
perror_plus("socket");
1740
errno = old_errno;
1741
return ret_errno;
1742
}
1743
1744
if(quit_now){
1745
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1746
if(ret == -1){
1747
perror_plus("close");
1748
}
1749
errno = old_errno;
1750
return EINTR;
1751
}
1752
1753
if(debug){
1754
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1755
interface);
1756
}
1757
1758
/* Raise privileges */
1759
ret_errno = raise_privileges();
1760
if(ret_errno != 0){
1761
perror_plus("Failed to raise privileges");
1762
}
1763
1764
#ifdef __linux__
1765
int ret_linux;
1766
bool restore_loglevel = false;
1767
if(ret_errno == 0){
1768
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1769
messages about the network interface to mess up the prompt */
1770
ret_linux = klogctl(8, NULL, 5);
1771
if(ret_linux == -1){
1772
perror_plus("klogctl");
1773
} else {
1774
restore_loglevel = true;
1775
}
1776
}
1777
#endif /* __linux__ */
1778
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1779
ioctl_errno = errno;
1780
#ifdef __linux__
1781
if(restore_loglevel){
1782
ret_linux = klogctl(7, NULL, 0);
1783
if(ret_linux == -1){
1784
perror_plus("klogctl");
1785
}
1786
}
1787
#endif /* __linux__ */
1788
1789
/* If raise_privileges() succeeded above */
1790
if(ret_errno == 0){
1791
/* Lower privileges */
1792
ret_errno = lower_privileges();
1793
if(ret_errno != 0){
1794
errno = ret_errno;
1795
perror_plus("Failed to lower privileges");
1796
}
1797
}
1798
1799
/* Close the socket */
1800
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1801
if(ret == -1){
1802
perror_plus("close");
1803
}
1804
1805
if(ret_setflags == -1){
1806
errno = ioctl_errno;
1807
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1808
errno = old_errno;
1809
return ioctl_errno;
1810
}
1811
} else if(debug){
1812
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1813
interface);
1814
}
1815
1816
/* Sleep checking until interface is running.
1817
Check every 0.25s, up to total time of delay */
1818
for(int i=0; i < delay * 4; i++){
1819
if(interface_is_running(interface)){
1820
break;
1821
}
1822
struct timespec sleeptime = { .tv_nsec = 250000000 };
1823
ret = nanosleep(&sleeptime, NULL);
1824
if(ret == -1 and errno != EINTR){
1825
perror_plus("nanosleep");
1826
}
1827
}
1828
1829
errno = old_errno;
1830
return 0;
1831
}
1832
1833
__attribute__((nonnull, warn_unused_result))
1834
error_t take_down_interface(const char *const interface){
1835
error_t old_errno = errno;
1836
struct ifreq network;
1837
unsigned int if_index = if_nametoindex(interface);
1838
if(if_index == 0){
1839
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1840
errno = old_errno;
1841
return ENXIO;
1842
}
1843
if(interface_is_up(interface)){
1844
error_t ret_errno = 0, ioctl_errno = 0;
1845
if(not get_flags(interface, &network) and debug){
1846
ret_errno = errno;
1847
fprintf_plus(stderr, "Failed to get flags for interface "
1848
"\"%s\"\n", interface);
1849
errno = old_errno;
1850
return ret_errno;
1851
}
1852
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1853
1854
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1855
if(sd == -1){
1856
ret_errno = errno;
1857
perror_plus("socket");
1858
errno = old_errno;
1859
return ret_errno;
1860
}
1861
1862
if(debug){
1863
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1864
interface);
1865
}
1866
1867
/* Raise privileges */
1868
ret_errno = raise_privileges();
1869
if(ret_errno != 0){
1870
perror_plus("Failed to raise privileges");
1871
}
1872
1873
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1874
ioctl_errno = errno;
1875
1876
/* If raise_privileges() succeeded above */
1877
if(ret_errno == 0){
1878
/* Lower privileges */
1879
ret_errno = lower_privileges();
1880
if(ret_errno != 0){
1881
errno = ret_errno;
1882
perror_plus("Failed to lower privileges");
1883
}
1884
}
1885
1886
/* Close the socket */
1887
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1888
if(ret == -1){
1889
perror_plus("close");
1890
}
1891
1892
if(ret_setflags == -1){
1893
errno = ioctl_errno;
1894
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1895
errno = old_errno;
1896
return ioctl_errno;
1897
}
1898
} else if(debug){
1899
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1900
interface);
1901
}
1902
1903
errno = old_errno;
1904
return 0;
1905
}
1906
1907
813
int main(int argc, char *argv[]){
1908
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1909
.priority = "SECURE256:!CTYPE-X.509:"
1910
"+CTYPE-OPENPGP", .current_server = NULL,
1911
.interfaces = NULL, .interfaces_size = 0 };
1912
AvahiSServiceBrowser *sb = NULL;
1913
error_t ret_errno;
1914
int ret;
1915
intmax_t tmpmax;
1916
char *tmp;
1917
int exitcode = EXIT_SUCCESS;
1918
char *interfaces_to_take_down = NULL;
1919
size_t interfaces_to_take_down_size = 0;
1920
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1921
char old_tempdir[] = "/tmp/mandosXXXXXX";
1922
char *tempdir = NULL;
1923
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1924
const char *seckey = PATHDIR "/" SECKEY;
1925
const char *pubkey = PATHDIR "/" PUBKEY;
1926
char *interfaces_hooks = NULL;
1927
1928
bool gnutls_initialized = false;
1929
bool gpgme_initialized = false;
1930
float delay = 2.5f;
1931
double retry_interval = 10; /* 10s between trying a server and
1932
retrying the same server again */
1933
1934
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1935
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1936
1937
uid = getuid();
1938
gid = getgid();
1939
1940
/* Lower any group privileges we might have, just to be safe */
1941
errno = 0;
1942
ret = setgid(gid);
1943
if(ret == -1){
1944
perror_plus("setgid");
1945
}
1946
1947
/* Lower user privileges (temporarily) */
1948
errno = 0;
1949
ret = seteuid(uid);
1950
if(ret == -1){
1951
perror_plus("seteuid");
1952
}
1953
1954
if(quit_now){
1955
goto end;
1956
}
1957
1958
{
1959
struct argp_option options[] = {
1960
{ .name = "debug", .key = 128,
1961
.doc = "Debug mode", .group = 3 },
1962
{ .name = "connect", .key = 'c',
1963
.arg = "ADDRESS:PORT",
1964
.doc = "Connect directly to a specific Mandos server",
1965
.group = 1 },
1966
{ .name = "interface", .key = 'i',
1967
.arg = "NAME",
1968
.doc = "Network interface that will be used to search for"
1969
" Mandos servers",
1970
.group = 1 },
1971
{ .name = "seckey", .key = 's',
1972
.arg = "FILE",
1973
.doc = "OpenPGP secret key file base name",
1974
.group = 1 },
1975
{ .name = "pubkey", .key = 'p',
1976
.arg = "FILE",
1977
.doc = "OpenPGP public key file base name",
1978
.group = 2 },
1979
{ .name = "dh-bits", .key = 129,
1980
.arg = "BITS",
1981
.doc = "Bit length of the prime number used in the"
1982
" Diffie-Hellman key exchange",
1983
.group = 2 },
1984
{ .name = "priority", .key = 130,
1985
.arg = "STRING",
1986
.doc = "GnuTLS priority string for the TLS handshake",
1987
.group = 1 },
1988
{ .name = "delay", .key = 131,
1989
.arg = "SECONDS",
1990
.doc = "Maximum delay to wait for interface startup",
1991
.group = 2 },
1992
{ .name = "retry", .key = 132,
1993
.arg = "SECONDS",
1994
.doc = "Retry interval used when denied by the Mandos server",
1995
.group = 2 },
1996
{ .name = "network-hook-dir", .key = 133,
1997
.arg = "DIR",
1998
.doc = "Directory where network hooks are located",
1999
.group = 2 },
2000
/*
2001
* These reproduce what we would get without ARGP_NO_HELP
2002
*/
2003
{ .name = "help", .key = '?',
2004
.doc = "Give this help list", .group = -1 },
2005
{ .name = "usage", .key = -3,
2006
.doc = "Give a short usage message", .group = -1 },
2007
{ .name = "version", .key = 'V',
2008
.doc = "Print program version", .group = -1 },
2009
{ .name = NULL }
2010
};
2011
2012
error_t parse_opt(int key, char *arg,
2013
struct argp_state *state){
814
AvahiSServiceBrowser *sb = NULL;
815
int error;
816
int ret;
817
int exitcode = EXIT_SUCCESS;
818
const char *interface = "eth0";
819
struct ifreq network;
820
int sd;
821
uid_t uid;
822
gid_t gid;
823
char *connect_to = NULL;
824
char tempdir[] = "/tmp/mandosXXXXXX";
825
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
826
const char *seckey = PATHDIR "/" SECKEY;
827
const char *pubkey = PATHDIR "/" PUBKEY;
828
829
mandos_context mc = { .simple_poll = NULL, .server = NULL,
830
.dh_bits = 1024, .priority = "SECURE256"
831
":!CTYPE-X.509:+CTYPE-OPENPGP" };
832
bool gnutls_initalized = false;
833
bool pgpme_initalized = false;
834
835
{
836
struct argp_option options[] = {
837
{ .name = "debug", .key = 128,
838
.doc = "Debug mode", .group = 3 },
839
{ .name = "connect", .key = 'c',
840
.arg = "ADDRESS:PORT",
841
.doc = "Connect directly to a specific Mandos server",
842
.group = 1 },
843
{ .name = "interface", .key = 'i',
844
.arg = "NAME",
845
.doc = "Interface that will be used to search for Mandos"
846
" servers",
847
.group = 1 },
848
{ .name = "seckey", .key = 's',
849
.arg = "FILE",
850
.doc = "OpenPGP secret key file base name",
851
.group = 1 },
852
{ .name = "pubkey", .key = 'p',
853
.arg = "FILE",
854
.doc = "OpenPGP public key file base name",
855
.group = 2 },
856
{ .name = "dh-bits", .key = 129,
857
.arg = "BITS",
858
.doc = "Bit length of the prime number used in the"
859
" Diffie-Hellman key exchange",
860
.group = 2 },
861
{ .name = "priority", .key = 130,
862
.arg = "STRING",
863
.doc = "GnuTLS priority string for the TLS handshake",
864
.group = 1 },
865
{ .name = NULL }
866
};
867
868
error_t parse_opt (int key, char *arg,
869
struct argp_state *state) {
870
/* Get the INPUT argument from `argp_parse', which we know is
871
a pointer to our plugin list pointer. */
872
switch (key) {
873
case 128: /* --debug */
874
debug = true;
875
break;
876
case 'c': /* --connect */
877
connect_to = arg;
878
break;
879
case 'i': /* --interface */
880
interface = arg;
881
break;
882
case 's': /* --seckey */
883
seckey = arg;
884
break;
885
case 'p': /* --pubkey */
886
pubkey = arg;
887
break;
888
case 129: /* --dh-bits */
889
errno = 0;
890
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
891
if (errno){
892
perror("strtol");
893
exit(EXIT_FAILURE);
894
}
895
break;
896
case 130: /* --priority */
897
mc.priority = arg;
898
break;
899
case ARGP_KEY_ARG:
900
argp_usage (state);
901
case ARGP_KEY_END:
902
break;
903
default:
904
return ARGP_ERR_UNKNOWN;
905
}
906
return 0;
907
}
908
909
struct argp argp = { .options = options, .parser = parse_opt,
910
.args_doc = "",
911
.doc = "Mandos client -- Get and decrypt"
912
" passwords from a Mandos server" };
913
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
914
if (ret == ARGP_ERR_UNKNOWN){
915
fprintf(stderr, "Unknown error while parsing arguments\n");
916
exitcode = EXIT_FAILURE;
917
goto end;
918
}
919
}
920
921
/* If the interface is down, bring it up */
922
{
923
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
924
if(sd < 0) {
925
perror("socket");
926
exitcode = EXIT_FAILURE;
927
goto end;
928
}
929
strcpy(network.ifr_name, interface);
930
ret = ioctl(sd, SIOCGIFFLAGS, &network);
931
if(ret == -1){
932
perror("ioctl SIOCGIFFLAGS");
933
exitcode = EXIT_FAILURE;
934
goto end;
935
}
936
if((network.ifr_flags & IFF_UP) == 0){
937
network.ifr_flags |= IFF_UP;
938
ret = ioctl(sd, SIOCSIFFLAGS, &network);
939
if(ret == -1){
940
perror("ioctl SIOCSIFFLAGS");
941
exitcode = EXIT_FAILURE;
942
goto end;
943
}
944
}
945
ret = TEMP_FAILURE_RETRY(close(sd));
946
if(ret == -1){
947
perror("close");
948
}
949
}
950
951
uid = getuid();
952
gid = getgid();
953
954
ret = setuid(uid);
955
if (ret == -1){
956
perror("setuid");
957
}
958
959
setgid(gid);
960
if (ret == -1){
961
perror("setgid");
962
}
963
964
ret = init_gnutls_global(&mc, pubkey, seckey);
965
if (ret == -1){
966
fprintf(stderr, "init_gnutls_global failed\n");
967
exitcode = EXIT_FAILURE;
968
goto end;
969
} else {
970
gnutls_initalized = true;
971
}
972
973
if(mkdtemp(tempdir) == NULL){
974
perror("mkdtemp");
975
tempdir[0] = '\0';
976
goto end;
977
}
978
979
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
980
fprintf(stderr, "pgpme_initalized failed\n");
981
exitcode = EXIT_FAILURE;
982
goto end;
983
} else {
984
pgpme_initalized = true;
985
}
986
987
if_index = (AvahiIfIndex) if_nametoindex(interface);
988
if(if_index == 0){
989
fprintf(stderr, "No such interface: \"%s\"\n", interface);
990
exit(EXIT_FAILURE);
991
}
992
993
if(connect_to != NULL){
994
/* Connect directly, do not use Zeroconf */
995
/* (Mainly meant for debugging) */
996
char *address = strrchr(connect_to, ':');
997
if(address == NULL){
998
fprintf(stderr, "No colon in address\n");
999
exitcode = EXIT_FAILURE;
1000
goto end;
1001
}
2014
1002
errno = 0;
2015
switch(key){
2016
case 128: /* --debug */
2017
debug = true;
2018
break;
2019
case 'c': /* --connect */
2020
connect_to = arg;
2021
break;
2022
case 'i': /* --interface */
2023
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2024
arg, (int)',');
2025
if(ret_errno != 0){
2026
argp_error(state, "%s", strerror(ret_errno));
2027
}
2028
break;
2029
case 's': /* --seckey */
2030
seckey = arg;
2031
break;
2032
case 'p': /* --pubkey */
2033
pubkey = arg;
2034
break;
2035
case 129: /* --dh-bits */
2036
errno = 0;
2037
tmpmax = strtoimax(arg, &tmp, 10);
2038
if(errno != 0 or tmp == arg or *tmp != '\0'
2039
or tmpmax != (typeof(mc.dh_bits))tmpmax){
2040
argp_error(state, "Bad number of DH bits");
2041
}
2042
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2043
break;
2044
case 130: /* --priority */
2045
mc.priority = arg;
2046
break;
2047
case 131: /* --delay */
2048
errno = 0;
2049
delay = strtof(arg, &tmp);
2050
if(errno != 0 or tmp == arg or *tmp != '\0'){
2051
argp_error(state, "Bad delay");
2052
}
2053
case 132: /* --retry */
2054
errno = 0;
2055
retry_interval = strtod(arg, &tmp);
2056
if(errno != 0 or tmp == arg or *tmp != '\0'
2057
or (retry_interval * 1000) > INT_MAX
2058
or retry_interval < 0){
2059
argp_error(state, "Bad retry interval");
2060
}
2061
break;
2062
case 133: /* --network-hook-dir */
2063
hookdir = arg;
2064
break;
2065
/*
2066
* These reproduce what we would get without ARGP_NO_HELP
2067
*/
2068
case '?': /* --help */
2069
argp_state_help(state, state->out_stream,
2070
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2071
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2072
case -3: /* --usage */
2073
argp_state_help(state, state->out_stream,
2074
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2075
case 'V': /* --version */
2076
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2077
exit(argp_err_exit_status);
2078
break;
2079
default:
2080
return ARGP_ERR_UNKNOWN;
2081
}
2082
return errno;
2083
}
2084
2085
struct argp argp = { .options = options, .parser = parse_opt,
2086
.args_doc = "",
2087
.doc = "Mandos client -- Get and decrypt"
2088
" passwords from a Mandos server" };
2089
ret = argp_parse(&argp, argc, argv,
2090
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2091
switch(ret){
2092
case 0:
2093
break;
2094
case ENOMEM:
2095
default:
2096
errno = ret;
2097
perror_plus("argp_parse");
2098
exitcode = EX_OSERR;
2099
goto end;
2100
case EINVAL:
2101
exitcode = EX_USAGE;
2102
goto end;
2103
}
2104
}
2105
2106
{
2107
/* Work around Debian bug #633582:
2108
<http://bugs.debian.org/633582> */
2109
2110
/* Re-raise privileges */
2111
ret_errno = raise_privileges();
2112
if(ret_errno != 0){
2113
errno = ret_errno;
2114
perror_plus("Failed to raise privileges");
2115
} else {
2116
struct stat st;
2117
2118
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2119
int seckey_fd = open(seckey, O_RDONLY);
2120
if(seckey_fd == -1){
2121
perror_plus("open");
2122
} else {
2123
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2124
if(ret == -1){
2125
perror_plus("fstat");
2126
} else {
2127
if(S_ISREG(st.st_mode)
2128
and st.st_uid == 0 and st.st_gid == 0){
2129
ret = fchown(seckey_fd, uid, gid);
2130
if(ret == -1){
2131
perror_plus("fchown");
2132
}
2133
}
2134
}
2135
TEMP_FAILURE_RETRY(close(seckey_fd));
2136
}
2137
}
2138
2139
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2140
int pubkey_fd = open(pubkey, O_RDONLY);
2141
if(pubkey_fd == -1){
2142
perror_plus("open");
2143
} else {
2144
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2145
if(ret == -1){
2146
perror_plus("fstat");
2147
} else {
2148
if(S_ISREG(st.st_mode)
2149
and st.st_uid == 0 and st.st_gid == 0){
2150
ret = fchown(pubkey_fd, uid, gid);
2151
if(ret == -1){
2152
perror_plus("fchown");
2153
}
2154
}
2155
}
2156
TEMP_FAILURE_RETRY(close(pubkey_fd));
2157
}
2158
}
2159
2160
/* Lower privileges */
2161
ret_errno = lower_privileges();
2162
if(ret_errno != 0){
2163
errno = ret_errno;
2164
perror_plus("Failed to lower privileges");
2165
}
2166
}
2167
}
2168
2169
/* Remove invalid interface names (except "none") */
2170
{
2171
char *interface = NULL;
2172
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2173
interface))){
2174
if(strcmp(interface, "none") != 0
2175
and if_nametoindex(interface) == 0){
2176
if(interface[0] != '\0'){
2177
fprintf_plus(stderr, "Not using nonexisting interface"
2178
" \"%s\"\n", interface);
2179
}
2180
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2181
interface = NULL;
2182
}
2183
}
2184
}
2185
2186
/* Run network hooks */
2187
{
2188
if(mc.interfaces != NULL){
2189
interfaces_hooks = malloc(mc.interfaces_size);
2190
if(interfaces_hooks == NULL){
2191
perror_plus("malloc");
1003
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
1004
if(errno){
1005
perror("Bad port number");
1006
exitcode = EXIT_FAILURE;
2192
1007
goto end;
2193
1008
}
2194
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2195
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2196
}
2197
run_network_hooks("start", interfaces_hooks != NULL ?
2198
interfaces_hooks : "", delay);
2199
}
2200
2201
if(not debug){
2202
avahi_set_log_function(empty_log);
2203
}
2204
2205
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2206
from the signal handler */
2207
/* Initialize the pseudo-RNG for Avahi */
2208
srand((unsigned int) time(NULL));
2209
simple_poll = avahi_simple_poll_new();
2210
if(simple_poll == NULL){
2211
fprintf_plus(stderr,
2212
"Avahi: Failed to create simple poll object.\n");
2213
exitcode = EX_UNAVAILABLE;
2214
goto end;
2215
}
2216
2217
sigemptyset(&sigterm_action.sa_mask);
2218
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2219
if(ret == -1){
2220
perror_plus("sigaddset");
2221
exitcode = EX_OSERR;
2222
goto end;
2223
}
2224
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2225
if(ret == -1){
2226
perror_plus("sigaddset");
2227
exitcode = EX_OSERR;
2228
goto end;
2229
}
2230
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2231
if(ret == -1){
2232
perror_plus("sigaddset");
2233
exitcode = EX_OSERR;
2234
goto end;
2235
}
2236
/* Need to check if the handler is SIG_IGN before handling:
2237
| [[info:libc:Initial Signal Actions]] |
2238
| [[info:libc:Basic Signal Handling]] |
2239
*/
2240
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2241
if(ret == -1){
2242
perror_plus("sigaction");
2243
return EX_OSERR;
2244
}
2245
if(old_sigterm_action.sa_handler != SIG_IGN){
2246
ret = sigaction(SIGINT, &sigterm_action, NULL);
2247
if(ret == -1){
2248
perror_plus("sigaction");
2249
exitcode = EX_OSERR;
2250
goto end;
2251
}
2252
}
2253
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2254
if(ret == -1){
2255
perror_plus("sigaction");
2256
return EX_OSERR;
2257
}
2258
if(old_sigterm_action.sa_handler != SIG_IGN){
2259
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2260
if(ret == -1){
2261
perror_plus("sigaction");
2262
exitcode = EX_OSERR;
2263
goto end;
2264
}
2265
}
2266
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2267
if(ret == -1){
2268
perror_plus("sigaction");
2269
return EX_OSERR;
2270
}
2271
if(old_sigterm_action.sa_handler != SIG_IGN){
2272
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2273
if(ret == -1){
2274
perror_plus("sigaction");
2275
exitcode = EX_OSERR;
2276
goto end;
2277
}
2278
}
2279
2280
/* If no interfaces were specified, make a list */
2281
if(mc.interfaces == NULL){
2282
struct dirent **direntries;
2283
/* Look for any good interfaces */
2284
ret = scandir(sys_class_net, &direntries, good_interface,
2285
alphasort);
2286
if(ret >= 1){
2287
/* Add all found interfaces to interfaces list */
2288
for(int i = 0; i < ret; ++i){
2289
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2290
direntries[i]->d_name);
2291
if(ret_errno != 0){
2292
errno = ret_errno;
2293
perror_plus("argz_add");
2294
continue;
2295
}
2296
if(debug){
2297
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2298
direntries[i]->d_name);
2299
}
2300
}
2301
free(direntries);
2302
} else {
2303
free(direntries);
2304
fprintf_plus(stderr, "Could not find a network interface\n");
2305
exitcode = EXIT_FAILURE;
2306
goto end;
2307
}
2308
}
2309
2310
/* Bring up interfaces which are down, and remove any "none"s */
2311
{
2312
char *interface = NULL;
2313
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2314
interface))){
2315
/* If interface name is "none", stop bringing up interfaces.
2316
Also remove all instances of "none" from the list */
2317
if(strcmp(interface, "none") == 0){
2318
argz_delete(&mc.interfaces, &mc.interfaces_size,
2319
interface);
2320
interface = NULL;
2321
while((interface = argz_next(mc.interfaces,
2322
mc.interfaces_size, interface))){
2323
if(strcmp(interface, "none") == 0){
2324
argz_delete(&mc.interfaces, &mc.interfaces_size,
2325
interface);
2326
interface = NULL;
2327
}
2328
}
2329
break;
2330
}
2331
bool interface_was_up = interface_is_up(interface);
2332
errno = bring_up_interface(interface, delay);
2333
if(not interface_was_up){
2334
if(errno != 0){
2335
perror_plus("Failed to bring up interface");
2336
} else {
2337
errno = argz_add(&interfaces_to_take_down,
2338
&interfaces_to_take_down_size,
2339
interface);
2340
if(errno != 0){
2341
perror_plus("argz_add");
2342
}
2343
}
2344
}
2345
}
2346
if(debug and (interfaces_to_take_down == NULL)){
2347
fprintf_plus(stderr, "No interfaces were brought up\n");
2348
}
2349
}
2350
2351
/* If we only got one interface, explicitly use only that one */
2352
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2353
if(debug){
2354
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2355
mc.interfaces);
2356
}
2357
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2358
}
2359
2360
if(quit_now){
2361
goto end;
2362
}
2363
2364
ret = init_gnutls_global(pubkey, seckey, &mc);
2365
if(ret == -1){
2366
fprintf_plus(stderr, "init_gnutls_global failed\n");
2367
exitcode = EX_UNAVAILABLE;
2368
goto end;
2369
} else {
2370
gnutls_initialized = true;
2371
}
2372
2373
if(quit_now){
2374
goto end;
2375
}
2376
2377
/* Try /run/tmp before /tmp */
2378
tempdir = mkdtemp(run_tempdir);
2379
if(tempdir == NULL and errno == ENOENT){
2380
if(debug){
2381
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2382
run_tempdir, old_tempdir);
2383
}
2384
tempdir = mkdtemp(old_tempdir);
2385
}
2386
if(tempdir == NULL){
2387
perror_plus("mkdtemp");
2388
goto end;
2389
}
2390
2391
if(quit_now){
2392
goto end;
2393
}
2394
2395
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2396
fprintf_plus(stderr, "init_gpgme failed\n");
2397
exitcode = EX_UNAVAILABLE;
2398
goto end;
2399
} else {
2400
gpgme_initialized = true;
2401
}
2402
2403
if(quit_now){
2404
goto end;
2405
}
2406
2407
if(connect_to != NULL){
2408
/* Connect directly, do not use Zeroconf */
2409
/* (Mainly meant for debugging) */
2410
char *address = strrchr(connect_to, ':');
2411
2412
if(address == NULL){
2413
fprintf_plus(stderr, "No colon in address\n");
2414
exitcode = EX_USAGE;
2415
goto end;
2416
}
2417
2418
if(quit_now){
2419
goto end;
2420
}
2421
2422
in_port_t port;
2423
errno = 0;
2424
tmpmax = strtoimax(address+1, &tmp, 10);
2425
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2426
or tmpmax != (in_port_t)tmpmax){
2427
fprintf_plus(stderr, "Bad port number\n");
2428
exitcode = EX_USAGE;
2429
goto end;
2430
}
2431
2432
if(quit_now){
2433
goto end;
2434
}
2435
2436
port = (in_port_t)tmpmax;
2437
*address = '\0';
2438
/* Colon in address indicates IPv6 */
2439
int af;
2440
if(strchr(connect_to, ':') != NULL){
2441
af = AF_INET6;
2442
/* Accept [] around IPv6 address - see RFC 5952 */
2443
if(connect_to[0] == '[' and address[-1] == ']')
2444
{
2445
connect_to++;
2446
address[-1] = '\0';
2447
}
2448
} else {
2449
af = AF_INET;
2450
}
2451
address = connect_to;
2452
2453
if(quit_now){
2454
goto end;
2455
}
2456
2457
while(not quit_now){
2458
ret = start_mandos_communication(address, port, if_index, af,
2459
&mc);
2460
if(quit_now or ret == 0){
2461
break;
2462
}
2463
if(debug){
2464
fprintf_plus(stderr, "Retrying in %d seconds\n",
2465
(int)retry_interval);
2466
}
2467
sleep((unsigned int)retry_interval);
2468
}
2469
2470
if(not quit_now){
2471
exitcode = EXIT_SUCCESS;
2472
}
2473
2474
goto end;
2475
}
2476
2477
if(quit_now){
2478
goto end;
2479
}
2480
2481
{
2482
AvahiServerConfig config;
2483
/* Do not publish any local Zeroconf records */
2484
avahi_server_config_init(&config);
2485
config.publish_hinfo = 0;
2486
config.publish_addresses = 0;
2487
config.publish_workstation = 0;
2488
config.publish_domain = 0;
2489
2490
/* Allocate a new server */
2491
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2492
&config, NULL, NULL, &ret_errno);
2493
2494
/* Free the Avahi configuration data */
2495
avahi_server_config_free(&config);
2496
}
2497
2498
/* Check if creating the Avahi server object succeeded */
2499
if(mc.server == NULL){
2500
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2501
avahi_strerror(ret_errno));
2502
exitcode = EX_UNAVAILABLE;
2503
goto end;
2504
}
2505
2506
if(quit_now){
2507
goto end;
2508
}
2509
2510
/* Create the Avahi service browser */
2511
sb = avahi_s_service_browser_new(mc.server, if_index,
2512
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2513
NULL, 0, browse_callback,
2514
(void *)&mc);
2515
if(sb == NULL){
2516
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2517
avahi_strerror(avahi_server_errno(mc.server)));
2518
exitcode = EX_UNAVAILABLE;
2519
goto end;
2520
}
2521
2522
if(quit_now){
2523
goto end;
2524
}
2525
2526
/* Run the main loop */
2527
2528
if(debug){
2529
fprintf_plus(stderr, "Starting Avahi loop search\n");
2530
}
2531
2532
ret = avahi_loop_with_timeout(simple_poll,
2533
(int)(retry_interval * 1000), &mc);
2534
if(debug){
2535
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2536
(ret == 0) ? "successfully" : "with error");
2537
}
2538
1009
*address = '\0';
1010
address = connect_to;
1011
ret = start_mandos_communication(address, port, if_index, &mc);
1012
if(ret < 0){
1013
exitcode = EXIT_FAILURE;
1014
} else {
1015
exitcode = EXIT_SUCCESS;
1016
}
1017
goto end;
1018
}
1019
1020
if (not debug){
1021
avahi_set_log_function(empty_log);
1022
}
1023
1024
/* Initialize the pseudo-RNG for Avahi */
1025
srand((unsigned int) time(NULL));
1026
1027
/* Allocate main Avahi loop object */
1028
mc.simple_poll = avahi_simple_poll_new();
1029
if (mc.simple_poll == NULL) {
1030
fprintf(stderr, "Avahi: Failed to create simple poll"
1031
" object.\n");
1032
exitcode = EXIT_FAILURE;
1033
goto end;
1034
}
1035
1036
{
1037
AvahiServerConfig config;
1038
/* Do not publish any local Zeroconf records */
1039
avahi_server_config_init(&config);
1040
config.publish_hinfo = 0;
1041
config.publish_addresses = 0;
1042
config.publish_workstation = 0;
1043
config.publish_domain = 0;
1044
1045
/* Allocate a new server */
1046
mc.server = avahi_server_new(avahi_simple_poll_get
1047
(mc.simple_poll), &config, NULL,
1048
NULL, &error);
1049
1050
/* Free the Avahi configuration data */
1051
avahi_server_config_free(&config);
1052
}
1053
1054
/* Check if creating the Avahi server object succeeded */
1055
if (mc.server == NULL) {
1056
fprintf(stderr, "Failed to create Avahi server: %s\n",
1057
avahi_strerror(error));
1058
exitcode = EXIT_FAILURE;
1059
goto end;
1060
}
1061
1062
/* Create the Avahi service browser */
1063
sb = avahi_s_service_browser_new(mc.server, if_index,
1064
AVAHI_PROTO_INET6,
1065
"_mandos._tcp", NULL, 0,
1066
browse_callback, &mc);
1067
if (sb == NULL) {
1068
fprintf(stderr, "Failed to create service browser: %s\n",
1069
avahi_strerror(avahi_server_errno(mc.server)));
1070
exitcode = EXIT_FAILURE;
1071
goto end;
1072
}
1073
1074
/* Run the main loop */
1075
1076
if (debug){
1077
fprintf(stderr, "Starting Avahi loop search\n");
1078
}
1079
1080
avahi_simple_poll_loop(mc.simple_poll);
1081
2539
1082
end:
2540
2541
if(debug){
2542
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2543
}
2544
2545
/* Cleanup things */
2546
free(mc.interfaces);
2547
2548
if(sb != NULL)
2549
avahi_s_service_browser_free(sb);
2550
2551
if(mc.server != NULL)
2552
avahi_server_free(mc.server);
2553
2554
if(simple_poll != NULL)
2555
avahi_simple_poll_free(simple_poll);
2556
2557
if(gnutls_initialized){
2558
gnutls_certificate_free_credentials(mc.cred);
2559
gnutls_global_deinit();
2560
gnutls_dh_params_deinit(mc.dh_params);
2561
}
2562
2563
if(gpgme_initialized){
2564
gpgme_release(mc.ctx);
2565
}
2566
2567
/* Cleans up the circular linked list of Mandos servers the client
2568
has seen */
2569
if(mc.current_server != NULL){
2570
mc.current_server->prev->next = NULL;
2571
while(mc.current_server != NULL){
2572
server *next = mc.current_server->next;
2573
free(mc.current_server);
2574
mc.current_server = next;
2575
}
2576
}
2577
2578
/* Re-raise privileges */
2579
{
2580
ret_errno = raise_privileges();
2581
if(ret_errno != 0){
2582
perror_plus("Failed to raise privileges");
2583
} else {
2584
2585
/* Run network hooks */
2586
run_network_hooks("stop", interfaces_hooks != NULL ?
2587
interfaces_hooks : "", delay);
2588
2589
/* Take down the network interfaces which were brought up */
2590
{
2591
char *interface = NULL;
2592
while((interface=argz_next(interfaces_to_take_down,
2593
interfaces_to_take_down_size,
2594
interface))){
2595
ret_errno = take_down_interface(interface);
2596
if(ret_errno != 0){
2597
errno = ret_errno;
2598
perror_plus("Failed to take down interface");
2599
}
2600
}
2601
if(debug and (interfaces_to_take_down == NULL)){
2602
fprintf_plus(stderr, "No interfaces needed to be taken"
2603
" down\n");
2604
}
2605
}
2606
}
2607
2608
ret_errno = lower_privileges_permanently();
2609
if(ret_errno != 0){
2610
perror_plus("Failed to lower privileges permanently");
2611
}
2612
}
2613
2614
free(interfaces_to_take_down);
2615
free(interfaces_hooks);
2616
2617
/* Removes the GPGME temp directory and all files inside */
2618
if(tempdir != NULL){
2619
struct dirent **direntries = NULL;
2620
struct dirent *direntry = NULL;
2621
int numentries = scandir(tempdir, &direntries, notdotentries,
2622
alphasort);
2623
if(numentries > 0){
2624
for(int i = 0; i < numentries; i++){
2625
direntry = direntries[i];
2626
char *fullname = NULL;
2627
ret = asprintf(&fullname, "%s/%s", tempdir,
2628
direntry->d_name);
2629
if(ret < 0){
2630
perror_plus("asprintf");
2631
continue;
2632
}
2633
ret = remove(fullname);
2634
if(ret == -1){
2635
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2636
strerror(errno));
2637
}
2638
free(fullname);
2639
}
2640
}
2641
2642
/* need to clean even if 0 because man page doesn't specify */
2643
free(direntries);
2644
if(numentries == -1){
2645
perror_plus("scandir");
2646
}
2647
ret = rmdir(tempdir);
2648
if(ret == -1 and errno != ENOENT){
2649
perror_plus("rmdir");
2650
}
2651
}
2652
2653
if(quit_now){
2654
sigemptyset(&old_sigterm_action.sa_mask);
2655
old_sigterm_action.sa_handler = SIG_DFL;
2656
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2657
&old_sigterm_action,
2658
NULL));
2659
if(ret == -1){
2660
perror_plus("sigaction");
2661
}
2662
do {
2663
ret = raise(signal_received);
2664
} while(ret != 0 and errno == EINTR);
2665
if(ret != 0){
2666
perror_plus("raise");
2667
abort();
2668
}
2669
TEMP_FAILURE_RETRY(pause());
2670
}
2671
2672
return exitcode;
1083
1084
if (debug){
1085
fprintf(stderr, "%s exiting\n", argv[0]);
1086
}
1087
1088
/* Cleanup things */
1089
if (sb != NULL)
1090
avahi_s_service_browser_free(sb);
1091
1092
if (mc.server != NULL)
1093
avahi_server_free(mc.server);
1094
1095
if (mc.simple_poll != NULL)
1096
avahi_simple_poll_free(mc.simple_poll);
1097
1098
if (gnutls_initalized){
1099
gnutls_certificate_free_credentials(mc.cred);
1100
gnutls_global_deinit ();
1101
}
1102
1103
if(pgpme_initalized){
1104
gpgme_release(mc.ctx);
1105
}
1106
1107
/* Removes the temp directory used by GPGME */
1108
if(tempdir[0] != '\0'){
1109
DIR *d;
1110
struct dirent *direntry;
1111
d = opendir(tempdir);
1112
if(d == NULL){
1113
perror("opendir");
1114
} else {
1115
while(true){
1116
direntry = readdir(d);
1117
if(direntry == NULL){
1118
break;
1119
}
1120
if (direntry->d_type == DT_REG){
1121
char *fullname = NULL;
1122
ret = asprintf(&fullname, "%s/%s", tempdir,
1123
direntry->d_name);
1124
if(ret < 0){
1125
perror("asprintf");
1126
continue;
1127
}
1128
ret = unlink(fullname);
1129
if(ret == -1){
1130
fprintf(stderr, "unlink(\"%s\"): %s",
1131
fullname, strerror(errno));
1132
}
1133
free(fullname);
1134
}
1135
}
1136
}
1137
ret = rmdir(tempdir);
1138
if(ret == -1){
1139
perror("rmdir");
1140
}
1141
}
1142
1143
return exitcode;
2673
1144
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0