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- Committer: Teddy Hogeborn
- Date: 2009-02-07 04:50:39 UTC
- Revision ID: teddy@fukt.bsnet.se-20090207045039-xkr6b80vtqwqrq8l
* Makefile (install-client-nokey): Move "initramfs-tools-script" from
"/scripts/local-top/mandos" to
"/scripts/init-premount/mandos".
(uninstall-client): - '' -
* debian/mandos-client.dirs: - '' -
* initramfs-tools-script (PREREQ): Added "udev".
"/scripts/local-top/mandos" to
"/scripts/init-premount/mandos".
(uninstall-client): - '' -
* debian/mandos-client.dirs: - '' -
* initramfs-tools-script (PREREQ): Added "udev".
- files removed:
- DBUS-API
- debian/source
- network-hooks.d
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@recompile.se>.
29
* Contact the authors at <mandos@fukt.bsnet.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
34
33
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
37
34
#define _FILE_OFFSET_BITS 64
38
#endif
39
35
40
36
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
37
42
38
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
39
stdout, ferror(), sscanf(),
40
remove() */
44
41
#include <stdint.h> /* uint16_t, uint32_t */
45
42
#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 */
43
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
44
srand() */
45
#include <stdbool.h> /* bool, true */
49
46
#include <string.h> /* memset(), strcmp(), strlen(),
50
47
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
48
#include <sys/ioctl.h> /* ioctl */
52
49
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
50
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
51
SOCK_STREAM, INET6_ADDRSTRLEN,
52
uid_t, gid_t, open(), opendir(),
53
DIR */
54
#include <sys/stat.h> /* open() */
57
55
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
56
struct in6_addr, inet_pton(),
57
connect() */
59
58
#include <fcntl.h> /* open() */
60
59
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
60
*/
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
61
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
64
62
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
63
#include <errno.h> /* perror(), errno */
64
#include <time.h> /* nanosleep(), time() */
68
65
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
66
SIOCSIFFLAGS, if_indextoname(),
70
67
if_nametoindex(), IF_NAMESIZE */
71
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
*/
68
#include <netinet/in.h>
74
69
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
78
#include <iso646.h> /* not, or, and */
70
getuid(), getgid(), setuid(),
71
setgid() */
72
#include <arpa/inet.h> /* inet_pton(), htons */
73
#include <iso646.h> /* not, and, or */
79
74
#include <argp.h> /* struct argp_option, error_t, struct
80
75
argp_state, struct argp,
81
76
argp_parse(), ARGP_KEY_ARG,
82
77
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
92
78
#ifdef __linux__
93
79
#include <sys/klog.h> /* klogctl() */
94
#endif /* __linux__ */
80
#endif
95
81
96
82
/* Avahi */
97
83
/* All Avahi types, constants and functions
111
97
init_gnutls_session(),
112
98
GNUTLS_* */
113
99
#include <gnutls/openpgp.h>
114
/* gnutls_certificate_set_openpgp_key_file(),
115
GNUTLS_OPENPGP_FMT_BASE64 */
100
/* gnutls_certificate_set_openpgp_key_file(),
101
GNUTLS_OPENPGP_FMT_BASE64 */
116
102
117
103
/* GPGME */
118
104
#include <gpgme.h> /* All GPGME types, constants and
126
112
#define PATHDIR "/conf/conf.d/mandos"
127
113
#define SECKEY "seckey.txt"
128
114
#define PUBKEY "pubkey.txt"
129
#define HOOKDIR "/lib/mandos/network-hooks.d"
130
115
131
116
bool debug = false;
132
117
static const char mandos_protocol_version[] = "1";
133
118
const char *argp_program_version = "mandos-client " VERSION;
134
const char *argp_program_bug_address = "<mandos@recompile.se>";
135
static const char sys_class_net[] = "/sys/class/net";
136
char *connect_to = NULL;
137
const char *hookdir = HOOKDIR;
138
139
/* Doubly linked list that need to be circularly linked when used */
140
typedef struct server{
141
const char *ip;
142
uint16_t port;
143
AvahiIfIndex if_index;
144
int af;
145
struct timespec last_seen;
146
struct server *next;
147
struct server *prev;
148
} server;
119
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
149
120
150
121
/* Used for passing in values through the Avahi callback functions */
151
122
typedef struct {
156
127
gnutls_dh_params_t dh_params;
157
128
const char *priority;
158
129
gpgme_ctx_t ctx;
159
server *current_server;
160
130
} mandos_context;
161
131
162
/* global context so signal handler can reach it*/
163
mandos_context mc = { .simple_poll = NULL, .server = NULL,
164
.dh_bits = 1024, .priority = "SECURE256"
165
":!CTYPE-X.509:+CTYPE-OPENPGP",
166
.current_server = NULL };
167
168
sig_atomic_t quit_now = 0;
169
int signal_received = 0;
170
171
/* Function to use when printing errors */
172
void perror_plus(const char *print_text){
173
fprintf(stderr, "Mandos plugin %s: ",
174
program_invocation_short_name);
175
perror(print_text);
176
}
177
178
__attribute__((format (gnu_printf, 2, 3)))
179
int fprintf_plus(FILE *stream, const char *format, ...){
180
va_list ap;
181
va_start (ap, format);
182
183
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
184
program_invocation_short_name));
185
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
186
}
187
188
132
/*
189
* Make additional room in "buffer" for at least BUFFER_SIZE more
190
* bytes. "buffer_capacity" is how much is currently allocated,
133
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
134
* "buffer_capacity" is how much is currently allocated,
191
135
* "buffer_length" is how much is already used.
192
136
*/
193
size_t incbuffer(char **buffer, size_t buffer_length,
194
size_t buffer_capacity){
137
size_t adjustbuffer(char **buffer, size_t buffer_length,
138
size_t buffer_capacity){
195
139
if(buffer_length + BUFFER_SIZE > buffer_capacity){
196
140
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
197
141
if(buffer == NULL){
202
146
return buffer_capacity;
203
147
}
204
148
205
/* Add server to set of servers to retry periodically */
206
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
207
int af){
208
int ret;
209
server *new_server = malloc(sizeof(server));
210
if(new_server == NULL){
211
perror_plus("malloc");
212
return false;
213
}
214
*new_server = (server){ .ip = strdup(ip),
215
.port = port,
216
.if_index = if_index,
217
.af = af };
218
if(new_server->ip == NULL){
219
perror_plus("strdup");
220
return false;
221
}
222
/* Special case of first server */
223
if (mc.current_server == NULL){
224
new_server->next = new_server;
225
new_server->prev = new_server;
226
mc.current_server = new_server;
227
/* Place the new server last in the list */
228
} else {
229
new_server->next = mc.current_server;
230
new_server->prev = mc.current_server->prev;
231
new_server->prev->next = new_server;
232
mc.current_server->prev = new_server;
233
}
234
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
235
if(ret == -1){
236
perror_plus("clock_gettime");
237
return false;
238
}
239
return true;
240
}
241
242
149
/*
243
150
* Initialize GPGME.
244
151
*/
245
static bool init_gpgme(const char *seckey, const char *pubkey,
246
const char *tempdir){
152
static bool init_gpgme(mandos_context *mc, const char *seckey,
153
const char *pubkey, const char *tempdir){
154
int ret;
247
155
gpgme_error_t rc;
248
156
gpgme_engine_info_t engine_info;
249
157
252
160
* Helper function to insert pub and seckey to the engine keyring.
253
161
*/
254
162
bool import_key(const char *filename){
255
int ret;
256
163
int fd;
257
164
gpgme_data_t pgp_data;
258
165
259
166
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
260
167
if(fd == -1){
261
perror_plus("open");
168
perror("open");
262
169
return false;
263
170
}
264
171
265
172
rc = gpgme_data_new_from_fd(&pgp_data, fd);
266
173
if(rc != GPG_ERR_NO_ERROR){
267
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
268
gpgme_strsource(rc), gpgme_strerror(rc));
174
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
175
gpgme_strsource(rc), gpgme_strerror(rc));
269
176
return false;
270
177
}
271
178
272
rc = gpgme_op_import(mc.ctx, pgp_data);
179
rc = gpgme_op_import(mc->ctx, pgp_data);
273
180
if(rc != GPG_ERR_NO_ERROR){
274
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
275
gpgme_strsource(rc), gpgme_strerror(rc));
181
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
182
gpgme_strsource(rc), gpgme_strerror(rc));
276
183
return false;
277
184
}
278
185
279
186
ret = (int)TEMP_FAILURE_RETRY(close(fd));
280
187
if(ret == -1){
281
perror_plus("close");
188
perror("close");
282
189
}
283
190
gpgme_data_release(pgp_data);
284
191
return true;
285
192
}
286
193
287
194
if(debug){
288
fprintf_plus(stderr, "Initializing GPGME\n");
195
fprintf(stderr, "Initialize gpgme\n");
289
196
}
290
197
291
198
/* Init GPGME */
292
199
gpgme_check_version(NULL);
293
200
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
294
201
if(rc != GPG_ERR_NO_ERROR){
295
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
296
gpgme_strsource(rc), gpgme_strerror(rc));
202
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
203
gpgme_strsource(rc), gpgme_strerror(rc));
297
204
return false;
298
205
}
299
206
300
/* Set GPGME home directory for the OpenPGP engine only */
207
/* Set GPGME home directory for the OpenPGP engine only */
301
208
rc = gpgme_get_engine_info(&engine_info);
302
209
if(rc != GPG_ERR_NO_ERROR){
303
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
304
gpgme_strsource(rc), gpgme_strerror(rc));
210
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
211
gpgme_strsource(rc), gpgme_strerror(rc));
305
212
return false;
306
213
}
307
214
while(engine_info != NULL){
313
220
engine_info = engine_info->next;
314
221
}
315
222
if(engine_info == NULL){
316
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
317
tempdir);
223
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
318
224
return false;
319
225
}
320
226
321
227
/* Create new GPGME "context" */
322
rc = gpgme_new(&(mc.ctx));
228
rc = gpgme_new(&(mc->ctx));
323
229
if(rc != GPG_ERR_NO_ERROR){
324
fprintf_plus(stderr, "Mandos plugin mandos-client: "
325
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
326
gpgme_strerror(rc));
230
fprintf(stderr, "bad gpgme_new: %s: %s\n",
231
gpgme_strsource(rc), gpgme_strerror(rc));
327
232
return false;
328
233
}
329
234
331
236
return false;
332
237
}
333
238
334
return true;
239
return true;
335
240
}
336
241
337
242
/*
338
243
* Decrypt OpenPGP data.
339
244
* Returns -1 on error
340
245
*/
341
static ssize_t pgp_packet_decrypt(const char *cryptotext,
246
static ssize_t pgp_packet_decrypt(const mandos_context *mc,
247
const char *cryptotext,
342
248
size_t crypto_size,
343
249
char **plaintext){
344
250
gpgme_data_t dh_crypto, dh_plain;
348
254
ssize_t plaintext_length = 0;
349
255
350
256
if(debug){
351
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
257
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
352
258
}
353
259
354
260
/* Create new GPGME data buffer from memory cryptotext */
355
261
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
356
262
0);
357
263
if(rc != GPG_ERR_NO_ERROR){
358
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
359
gpgme_strsource(rc), gpgme_strerror(rc));
264
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
265
gpgme_strsource(rc), gpgme_strerror(rc));
360
266
return -1;
361
267
}
362
268
363
269
/* Create new empty GPGME data buffer for the plaintext */
364
270
rc = gpgme_data_new(&dh_plain);
365
271
if(rc != GPG_ERR_NO_ERROR){
366
fprintf_plus(stderr, "Mandos plugin mandos-client: "
367
"bad gpgme_data_new: %s: %s\n",
368
gpgme_strsource(rc), gpgme_strerror(rc));
272
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
273
gpgme_strsource(rc), gpgme_strerror(rc));
369
274
gpgme_data_release(dh_crypto);
370
275
return -1;
371
276
}
372
277
373
278
/* Decrypt data from the cryptotext data buffer to the plaintext
374
279
data buffer */
375
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
280
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
376
281
if(rc != GPG_ERR_NO_ERROR){
377
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
378
gpgme_strsource(rc), gpgme_strerror(rc));
282
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
283
gpgme_strsource(rc), gpgme_strerror(rc));
379
284
plaintext_length = -1;
380
285
if(debug){
381
286
gpgme_decrypt_result_t result;
382
result = gpgme_op_decrypt_result(mc.ctx);
287
result = gpgme_op_decrypt_result(mc->ctx);
383
288
if(result == NULL){
384
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
289
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
385
290
} else {
386
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
387
result->unsupported_algorithm);
388
fprintf_plus(stderr, "Wrong key usage: %u\n",
389
result->wrong_key_usage);
291
fprintf(stderr, "Unsupported algorithm: %s\n",
292
result->unsupported_algorithm);
293
fprintf(stderr, "Wrong key usage: %u\n",
294
result->wrong_key_usage);
390
295
if(result->file_name != NULL){
391
fprintf_plus(stderr, "File name: %s\n", result->file_name);
296
fprintf(stderr, "File name: %s\n", result->file_name);
392
297
}
393
298
gpgme_recipient_t recipient;
394
299
recipient = result->recipients;
395
while(recipient != NULL){
396
fprintf_plus(stderr, "Public key algorithm: %s\n",
397
gpgme_pubkey_algo_name
398
(recipient->pubkey_algo));
399
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
400
fprintf_plus(stderr, "Secret key available: %s\n",
401
recipient->status == GPG_ERR_NO_SECKEY
402
? "No" : "Yes");
403
recipient = recipient->next;
300
if(recipient){
301
while(recipient != NULL){
302
fprintf(stderr, "Public key algorithm: %s\n",
303
gpgme_pubkey_algo_name(recipient->pubkey_algo));
304
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
305
fprintf(stderr, "Secret key available: %s\n",
306
recipient->status == GPG_ERR_NO_SECKEY
307
? "No" : "Yes");
308
recipient = recipient->next;
309
}
404
310
}
405
311
}
406
312
}
408
314
}
409
315
410
316
if(debug){
411
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
317
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
412
318
}
413
319
414
320
/* Seek back to the beginning of the GPGME plaintext data buffer */
415
321
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
416
perror_plus("gpgme_data_seek");
322
perror("gpgme_data_seek");
417
323
plaintext_length = -1;
418
324
goto decrypt_end;
419
325
}
420
326
421
327
*plaintext = NULL;
422
328
while(true){
423
plaintext_capacity = incbuffer(plaintext,
424
(size_t)plaintext_length,
425
plaintext_capacity);
329
plaintext_capacity = adjustbuffer(plaintext,
330
(size_t)plaintext_length,
331
plaintext_capacity);
426
332
if(plaintext_capacity == 0){
427
perror_plus("incbuffer");
428
plaintext_length = -1;
429
goto decrypt_end;
333
perror("adjustbuffer");
334
plaintext_length = -1;
335
goto decrypt_end;
430
336
}
431
337
432
338
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
437
343
break;
438
344
}
439
345
if(ret < 0){
440
perror_plus("gpgme_data_read");
346
perror("gpgme_data_read");
441
347
plaintext_length = -1;
442
348
goto decrypt_end;
443
349
}
445
351
}
446
352
447
353
if(debug){
448
fprintf_plus(stderr, "Decrypted password is: ");
354
fprintf(stderr, "Decrypted password is: ");
449
355
for(ssize_t i = 0; i < plaintext_length; i++){
450
356
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
451
357
}
473
379
/* GnuTLS log function callback */
474
380
static void debuggnutls(__attribute__((unused)) int level,
475
381
const char* string){
476
fprintf_plus(stderr, "GnuTLS: %s", string);
382
fprintf(stderr, "GnuTLS: %s", string);
477
383
}
478
384
479
static int init_gnutls_global(const char *pubkeyfilename,
385
static int init_gnutls_global(mandos_context *mc,
386
const char *pubkeyfilename,
480
387
const char *seckeyfilename){
481
388
int ret;
482
389
483
390
if(debug){
484
fprintf_plus(stderr, "Initializing GnuTLS\n");
391
fprintf(stderr, "Initializing GnuTLS\n");
485
392
}
486
393
487
394
ret = gnutls_global_init();
488
395
if(ret != GNUTLS_E_SUCCESS){
489
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
490
safer_gnutls_strerror(ret));
396
fprintf(stderr, "GnuTLS global_init: %s\n",
397
safer_gnutls_strerror(ret));
491
398
return -1;
492
399
}
493
400
500
407
}
501
408
502
409
/* OpenPGP credentials */
503
ret = gnutls_certificate_allocate_credentials(&mc.cred);
410
gnutls_certificate_allocate_credentials(&mc->cred);
504
411
if(ret != GNUTLS_E_SUCCESS){
505
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
506
safer_gnutls_strerror(ret));
412
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
413
* from
414
* -Wunreachable-code
415
*/
416
safer_gnutls_strerror(ret));
507
417
gnutls_global_deinit();
508
418
return -1;
509
419
}
510
420
511
421
if(debug){
512
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
513
" secret key %s as GnuTLS credentials\n",
514
pubkeyfilename,
515
seckeyfilename);
422
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
423
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
424
seckeyfilename);
516
425
}
517
426
518
427
ret = gnutls_certificate_set_openpgp_key_file
519
(mc.cred, pubkeyfilename, seckeyfilename,
428
(mc->cred, pubkeyfilename, seckeyfilename,
520
429
GNUTLS_OPENPGP_FMT_BASE64);
521
430
if(ret != GNUTLS_E_SUCCESS){
522
fprintf_plus(stderr,
523
"Error[%d] while reading the OpenPGP key pair ('%s',"
524
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
525
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
526
safer_gnutls_strerror(ret));
431
fprintf(stderr,
432
"Error[%d] while reading the OpenPGP key pair ('%s',"
433
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
434
fprintf(stderr, "The GnuTLS error is: %s\n",
435
safer_gnutls_strerror(ret));
527
436
goto globalfail;
528
437
}
529
438
530
439
/* GnuTLS server initialization */
531
ret = gnutls_dh_params_init(&mc.dh_params);
440
ret = gnutls_dh_params_init(&mc->dh_params);
532
441
if(ret != GNUTLS_E_SUCCESS){
533
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
534
" initialization: %s\n",
535
safer_gnutls_strerror(ret));
442
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
443
" %s\n", safer_gnutls_strerror(ret));
536
444
goto globalfail;
537
445
}
538
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
446
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
539
447
if(ret != GNUTLS_E_SUCCESS){
540
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
541
safer_gnutls_strerror(ret));
448
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
449
safer_gnutls_strerror(ret));
542
450
goto globalfail;
543
451
}
544
452
545
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
453
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
546
454
547
455
return 0;
548
456
549
457
globalfail:
550
458
551
gnutls_certificate_free_credentials(mc.cred);
459
gnutls_certificate_free_credentials(mc->cred);
552
460
gnutls_global_deinit();
553
gnutls_dh_params_deinit(mc.dh_params);
461
gnutls_dh_params_deinit(mc->dh_params);
554
462
return -1;
555
463
}
556
464
557
static int init_gnutls_session(gnutls_session_t *session){
465
static int init_gnutls_session(mandos_context *mc,
466
gnutls_session_t *session){
558
467
int ret;
559
468
/* GnuTLS session creation */
560
do {
561
ret = gnutls_init(session, GNUTLS_SERVER);
562
if(quit_now){
563
return -1;
564
}
565
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
469
ret = gnutls_init(session, GNUTLS_SERVER);
566
470
if(ret != GNUTLS_E_SUCCESS){
567
fprintf_plus(stderr,
568
"Error in GnuTLS session initialization: %s\n",
569
safer_gnutls_strerror(ret));
471
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
472
safer_gnutls_strerror(ret));
570
473
}
571
474
572
475
{
573
476
const char *err;
574
do {
575
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
576
if(quit_now){
577
gnutls_deinit(*session);
578
return -1;
579
}
580
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
477
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
581
478
if(ret != GNUTLS_E_SUCCESS){
582
fprintf_plus(stderr, "Syntax error at: %s\n", err);
583
fprintf_plus(stderr, "GnuTLS error: %s\n",
584
safer_gnutls_strerror(ret));
479
fprintf(stderr, "Syntax error at: %s\n", err);
480
fprintf(stderr, "GnuTLS error: %s\n",
481
safer_gnutls_strerror(ret));
585
482
gnutls_deinit(*session);
586
483
return -1;
587
484
}
588
485
}
589
486
590
do {
591
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
592
mc.cred);
593
if(quit_now){
594
gnutls_deinit(*session);
595
return -1;
596
}
597
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
487
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
488
mc->cred);
598
489
if(ret != GNUTLS_E_SUCCESS){
599
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
600
safer_gnutls_strerror(ret));
490
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
491
safer_gnutls_strerror(ret));
601
492
gnutls_deinit(*session);
602
493
return -1;
603
494
}
604
495
605
496
/* ignore client certificate if any. */
606
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
497
gnutls_certificate_server_set_request(*session,
498
GNUTLS_CERT_IGNORE);
607
499
608
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
500
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
609
501
610
502
return 0;
611
503
}
617
509
/* Called when a Mandos server is found */
618
510
static int start_mandos_communication(const char *ip, uint16_t port,
619
511
AvahiIfIndex if_index,
620
int af){
621
int ret, tcp_sd = -1;
512
mandos_context *mc){
513
int ret, tcp_sd;
622
514
ssize_t sret;
623
union {
624
struct sockaddr_in in;
625
struct sockaddr_in6 in6;
626
} to;
515
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
627
516
char *buffer = NULL;
628
char *decrypted_buffer = NULL;
517
char *decrypted_buffer;
629
518
size_t buffer_length = 0;
630
519
size_t buffer_capacity = 0;
520
ssize_t decrypted_buffer_size;
631
521
size_t written;
632
int retval = -1;
522
int retval = 0;
523
char interface[IF_NAMESIZE];
633
524
gnutls_session_t session;
634
int pf; /* Protocol family */
635
636
errno = 0;
637
638
if(quit_now){
639
errno = EINTR;
640
return -1;
641
}
642
643
switch(af){
644
case AF_INET6:
645
pf = PF_INET6;
646
break;
647
case AF_INET:
648
pf = PF_INET;
649
break;
650
default:
651
fprintf_plus(stderr, "Bad address family: %d\n", af);
652
errno = EINVAL;
653
return -1;
654
}
655
656
ret = init_gnutls_session(&session);
525
526
ret = init_gnutls_session(mc, &session);
657
527
if(ret != 0){
658
528
return -1;
659
529
}
660
530
661
531
if(debug){
662
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
663
PRIu16 "\n", ip, port);
532
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
533
"\n", ip, port);
664
534
}
665
535
666
tcp_sd = socket(pf, SOCK_STREAM, 0);
536
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
667
537
if(tcp_sd < 0){
668
int e = errno;
669
perror_plus("socket");
670
errno = e;
671
goto mandos_end;
538
perror("socket");
539
return -1;
672
540
}
673
541
674
if(quit_now){
675
errno = EINTR;
676
goto mandos_end;
542
if(debug){
543
if(if_indextoname((unsigned int)if_index, interface) == NULL){
544
perror("if_indextoname");
545
return -1;
546
}
547
fprintf(stderr, "Binding to interface %s\n", interface);
677
548
}
678
549
679
550
memset(&to, 0, sizeof(to));
680
if(af == AF_INET6){
681
to.in6.sin6_family = (sa_family_t)af;
682
ret = inet_pton(af, ip, &to.in6.sin6_addr);
683
} else { /* IPv4 */
684
to.in.sin_family = (sa_family_t)af;
685
ret = inet_pton(af, ip, &to.in.sin_addr);
686
}
551
to.in6.sin6_family = AF_INET6;
552
/* It would be nice to have a way to detect if we were passed an
553
IPv4 address here. Now we assume an IPv6 address. */
554
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
687
555
if(ret < 0 ){
688
int e = errno;
689
perror_plus("inet_pton");
690
errno = e;
691
goto mandos_end;
556
perror("inet_pton");
557
return -1;
692
558
}
693
559
if(ret == 0){
694
int e = errno;
695
fprintf_plus(stderr, "Bad address: %s\n", ip);
696
errno = e;
697
goto mandos_end;
560
fprintf(stderr, "Bad address: %s\n", ip);
561
return -1;
698
562
}
699
if(af == AF_INET6){
700
to.in6.sin6_port = htons(port); /* Spurious warnings from
701
-Wconversion and
702
-Wunreachable-code */
703
704
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
705
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
706
-Wunreachable-code*/
707
if(if_index == AVAHI_IF_UNSPEC){
708
fprintf_plus(stderr, "An IPv6 link-local address is"
709
" incomplete without a network interface\n");
710
errno = EINVAL;
711
goto mandos_end;
712
}
713
/* Set the network interface number as scope */
714
to.in6.sin6_scope_id = (uint32_t)if_index;
715
}
716
} else {
717
to.in.sin_port = htons(port); /* Spurious warnings from
563
to.in6.sin6_port = htons(port); /* Spurious warnings from
718
564
-Wconversion and
719
565
-Wunreachable-code */
720
}
721
566
722
if(quit_now){
723
errno = EINTR;
724
goto mandos_end;
725
}
567
to.in6.sin6_scope_id = (uint32_t)if_index;
726
568
727
569
if(debug){
728
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
729
char interface[IF_NAMESIZE];
730
if(if_indextoname((unsigned int)if_index, interface) == NULL){
731
perror_plus("if_indextoname");
732
} else {
733
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
734
"\n", ip, interface, port);
735
}
736
} else {
737
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
738
ip, port);
739
}
740
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
741
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
742
const char *pcret;
743
if(af == AF_INET6){
744
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
745
sizeof(addrstr));
746
} else {
747
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
748
sizeof(addrstr));
749
}
750
if(pcret == NULL){
751
perror_plus("inet_ntop");
570
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
571
port);
572
char addrstr[INET6_ADDRSTRLEN] = "";
573
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
574
sizeof(addrstr)) == NULL){
575
perror("inet_ntop");
752
576
} else {
753
577
if(strcmp(addrstr, ip) != 0){
754
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
578
fprintf(stderr, "Canonical address form: %s\n", addrstr);
755
579
}
756
580
}
757
581
}
758
582
759
if(quit_now){
760
errno = EINTR;
761
goto mandos_end;
762
}
763
764
if(af == AF_INET6){
765
ret = connect(tcp_sd, &to.in6, sizeof(to));
766
} else {
767
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
768
}
583
ret = connect(tcp_sd, &to.in, sizeof(to));
769
584
if(ret < 0){
770
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
771
int e = errno;
772
perror_plus("connect");
773
errno = e;
774
}
775
goto mandos_end;
776
}
777
778
if(quit_now){
779
errno = EINTR;
780
goto mandos_end;
585
perror("connect");
586
return -1;
781
587
}
782
588
783
589
const char *out = mandos_protocol_version;
785
591
while(true){
786
592
size_t out_size = strlen(out);
787
593
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
788
out_size - written));
594
out_size - written));
789
595
if(ret == -1){
790
int e = errno;
791
perror_plus("write");
792
errno = e;
596
perror("write");
597
retval = -1;
793
598
goto mandos_end;
794
599
}
795
600
written += (size_t)ret;
803
608
break;
804
609
}
805
610
}
806
807
if(quit_now){
808
errno = EINTR;
809
goto mandos_end;
810
}
811
611
}
812
612
813
613
if(debug){
814
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
815
}
816
817
if(quit_now){
818
errno = EINTR;
819
goto mandos_end;
820
}
821
822
/* Spurious warning from -Wint-to-pointer-cast */
614
fprintf(stderr, "Establishing TLS session with %s\n", ip);
615
}
616
823
617
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
824
618
825
if(quit_now){
826
errno = EINTR;
827
goto mandos_end;
828
}
829
830
do {
619
do{
831
620
ret = gnutls_handshake(session);
832
if(quit_now){
833
errno = EINTR;
834
goto mandos_end;
835
}
836
621
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
837
622
838
623
if(ret != GNUTLS_E_SUCCESS){
839
624
if(debug){
840
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
625
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
841
626
gnutls_perror(ret);
842
627
}
843
errno = EPROTO;
628
retval = -1;
844
629
goto mandos_end;
845
630
}
846
631
847
632
/* Read OpenPGP packet that contains the wanted password */
848
633
849
634
if(debug){
850
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
851
" %s\n", ip);
635
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
636
ip);
852
637
}
853
638
854
639
while(true){
855
856
if(quit_now){
857
errno = EINTR;
858
goto mandos_end;
859
}
860
861
buffer_capacity = incbuffer(&buffer, buffer_length,
862
buffer_capacity);
640
buffer_capacity = adjustbuffer(&buffer, buffer_length,
641
buffer_capacity);
863
642
if(buffer_capacity == 0){
864
int e = errno;
865
perror_plus("incbuffer");
866
errno = e;
867
goto mandos_end;
868
}
869
870
if(quit_now){
871
errno = EINTR;
643
perror("adjustbuffer");
644
retval = -1;
872
645
goto mandos_end;
873
646
}
874
647
883
656
case GNUTLS_E_AGAIN:
884
657
break;
885
658
case GNUTLS_E_REHANDSHAKE:
886
do {
659
do{
887
660
ret = gnutls_handshake(session);
888
889
if(quit_now){
890
errno = EINTR;
891
goto mandos_end;
892
}
893
661
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
894
662
if(ret < 0){
895
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
896
"***\n");
663
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
897
664
gnutls_perror(ret);
898
errno = EPROTO;
665
retval = -1;
899
666
goto mandos_end;
900
667
}
901
668
break;
902
669
default:
903
fprintf_plus(stderr, "Unknown error while reading data from"
904
" encrypted session with Mandos server\n");
670
fprintf(stderr, "Unknown error while reading data from"
671
" encrypted session with Mandos server\n");
672
retval = -1;
905
673
gnutls_bye(session, GNUTLS_SHUT_RDWR);
906
errno = EIO;
907
674
goto mandos_end;
908
675
}
909
676
} else {
912
679
}
913
680
914
681
if(debug){
915
fprintf_plus(stderr, "Closing TLS session\n");
916
}
917
918
if(quit_now){
919
errno = EINTR;
920
goto mandos_end;
921
}
922
923
do {
924
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
925
if(quit_now){
926
errno = EINTR;
927
goto mandos_end;
928
}
929
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
682
fprintf(stderr, "Closing TLS session\n");
683
}
684
685
gnutls_bye(session, GNUTLS_SHUT_RDWR);
930
686
931
687
if(buffer_length > 0){
932
ssize_t decrypted_buffer_size;
933
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
688
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
689
buffer_length,
934
690
&decrypted_buffer);
935
691
if(decrypted_buffer_size >= 0){
936
937
692
written = 0;
938
693
while(written < (size_t) decrypted_buffer_size){
939
if(quit_now){
940
errno = EINTR;
941
goto mandos_end;
942
}
943
944
694
ret = (int)fwrite(decrypted_buffer + written, 1,
945
695
(size_t)decrypted_buffer_size - written,
946
696
stdout);
947
697
if(ret == 0 and ferror(stdout)){
948
int e = errno;
949
698
if(debug){
950
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
951
strerror(errno));
699
fprintf(stderr, "Error writing encrypted data: %s\n",
700
strerror(errno));
952
701
}
953
errno = e;
954
goto mandos_end;
702
retval = -1;
703
break;
955
704
}
956
705
written += (size_t)ret;
957
706
}
958
retval = 0;
707
free(decrypted_buffer);
708
} else {
709
retval = -1;
959
710
}
711
} else {
712
retval = -1;
960
713
}
961
714
962
715
/* Shutdown procedure */
963
716
964
717
mandos_end:
965
{
966
int e = errno;
967
free(decrypted_buffer);
968
free(buffer);
969
if(tcp_sd >= 0){
970
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
971
}
972
if(ret == -1){
973
if(e == 0){
974
e = errno;
975
}
976
perror_plus("close");
977
}
978
gnutls_deinit(session);
979
errno = e;
980
if(quit_now){
981
errno = EINTR;
982
retval = -1;
983
}
718
free(buffer);
719
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
720
if(ret == -1){
721
perror("close");
984
722
}
723
gnutls_deinit(session);
985
724
return retval;
986
725
}
987
726
988
727
static void resolve_callback(AvahiSServiceResolver *r,
989
728
AvahiIfIndex interface,
990
AvahiProtocol proto,
729
AVAHI_GCC_UNUSED AvahiProtocol protocol,
991
730
AvahiResolverEvent event,
992
731
const char *name,
993
732
const char *type,
998
737
AVAHI_GCC_UNUSED AvahiStringList *txt,
999
738
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1000
739
flags,
1001
AVAHI_GCC_UNUSED void* userdata){
740
void* userdata){
741
mandos_context *mc = userdata;
1002
742
assert(r);
1003
743
1004
744
/* Called whenever a service has been resolved successfully or
1005
745
timed out */
1006
746
1007
if(quit_now){
1008
return;
1009
}
1010
1011
747
switch(event){
1012
748
default:
1013
749
case AVAHI_RESOLVER_FAILURE:
1014
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1015
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1016
domain,
1017
avahi_strerror(avahi_server_errno(mc.server)));
750
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
751
" of type '%s' in domain '%s': %s\n", name, type, domain,
752
avahi_strerror(avahi_server_errno(mc->server)));
1018
753
break;
1019
754
1020
755
case AVAHI_RESOLVER_FOUND:
1022
757
char ip[AVAHI_ADDRESS_STR_MAX];
1023
758
avahi_address_snprint(ip, sizeof(ip), address);
1024
759
if(debug){
1025
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1026
PRIdMAX ") on port %" PRIu16 "\n", name,
1027
host_name, ip, (intmax_t)interface, port);
760
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
761
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
762
ip, (intmax_t)interface, port);
1028
763
}
1029
int ret = start_mandos_communication(ip, port, interface,
1030
avahi_proto_to_af(proto));
764
int ret = start_mandos_communication(ip, port, interface, mc);
1031
765
if(ret == 0){
1032
avahi_simple_poll_quit(mc.simple_poll);
1033
} else {
1034
if(not add_server(ip, port, interface,
1035
avahi_proto_to_af(proto))){
1036
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1037
" list\n", name);
1038
}
766
avahi_simple_poll_quit(mc->simple_poll);
1039
767
}
1040
768
}
1041
769
}
1051
779
const char *domain,
1052
780
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1053
781
flags,
1054
AVAHI_GCC_UNUSED void* userdata){
782
void* userdata){
783
mandos_context *mc = userdata;
1055
784
assert(b);
1056
785
1057
786
/* Called whenever a new services becomes available on the LAN or
1058
787
is removed from the LAN */
1059
788
1060
if(quit_now){
1061
return;
1062
}
1063
1064
789
switch(event){
1065
790
default:
1066
791
case AVAHI_BROWSER_FAILURE:
1067
792
1068
fprintf_plus(stderr, "(Avahi browser) %s\n",
1069
avahi_strerror(avahi_server_errno(mc.server)));
1070
avahi_simple_poll_quit(mc.simple_poll);
793
fprintf(stderr, "(Avahi browser) %s\n",
794
avahi_strerror(avahi_server_errno(mc->server)));
795
avahi_simple_poll_quit(mc->simple_poll);
1071
796
return;
1072
797
1073
798
case AVAHI_BROWSER_NEW:
1076
801
the callback function is called the Avahi server will free the
1077
802
resolver for us. */
1078
803
1079
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1080
name, type, domain, protocol, 0,
1081
resolve_callback, NULL) == NULL)
1082
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1083
" %s\n", name,
1084
avahi_strerror(avahi_server_errno(mc.server)));
804
if(!(avahi_s_service_resolver_new(mc->server, interface,
805
protocol, name, type, domain,
806
AVAHI_PROTO_INET6, 0,
807
resolve_callback, mc)))
808
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
809
name, avahi_strerror(avahi_server_errno(mc->server)));
1085
810
break;
1086
811
1087
812
case AVAHI_BROWSER_REMOVE:
1090
815
case AVAHI_BROWSER_ALL_FOR_NOW:
1091
816
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1092
817
if(debug){
1093
fprintf_plus(stderr, "No Mandos server found, still"
1094
" searching...\n");
818
fprintf(stderr, "No Mandos server found, still searching...\n");
1095
819
}
1096
820
break;
1097
821
}
1098
822
}
1099
823
1100
/* Signal handler that stops main loop after SIGTERM */
1101
static void handle_sigterm(int sig){
1102
if(quit_now){
1103
return;
1104
}
1105
quit_now = 1;
1106
signal_received = sig;
1107
int old_errno = errno;
1108
/* set main loop to exit */
1109
if(mc.simple_poll != NULL){
1110
avahi_simple_poll_quit(mc.simple_poll);
1111
}
1112
errno = old_errno;
1113
}
1114
1115
bool get_flags(const char *ifname, struct ifreq *ifr){
1116
int ret;
1117
1118
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1119
if(s < 0){
1120
perror_plus("socket");
1121
return false;
1122
}
1123
strcpy(ifr->ifr_name, ifname);
1124
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1125
if(ret == -1){
1126
if(debug){
1127
perror_plus("ioctl SIOCGIFFLAGS");
1128
}
1129
return false;
1130
}
1131
return true;
1132
}
1133
1134
bool good_flags(const char *ifname, const struct ifreq *ifr){
1135
1136
/* Reject the loopback device */
1137
if(ifr->ifr_flags & IFF_LOOPBACK){
1138
if(debug){
1139
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1140
ifname);
1141
}
1142
return false;
1143
}
1144
/* Accept point-to-point devices only if connect_to is specified */
1145
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1146
if(debug){
1147
fprintf_plus(stderr, "Accepting point-to-point interface"
1148
" \"%s\"\n", ifname);
1149
}
1150
return true;
1151
}
1152
/* Otherwise, reject non-broadcast-capable devices */
1153
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1154
if(debug){
1155
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1156
" \"%s\"\n", ifname);
1157
}
1158
return false;
1159
}
1160
/* Reject non-ARP interfaces (including dummy interfaces) */
1161
if(ifr->ifr_flags & IFF_NOARP){
1162
if(debug){
1163
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1164
ifname);
1165
}
1166
return false;
1167
}
1168
1169
/* Accept this device */
1170
if(debug){
1171
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1172
}
1173
return true;
1174
}
1175
1176
/*
1177
* This function determines if a directory entry in /sys/class/net
1178
* corresponds to an acceptable network device.
1179
* (This function is passed to scandir(3) as a filter function.)
1180
*/
1181
int good_interface(const struct dirent *if_entry){
1182
if(if_entry->d_name[0] == '.'){
1183
return 0;
1184
}
1185
1186
struct ifreq ifr;
1187
if(not get_flags(if_entry->d_name, &ifr)){
1188
if(debug){
1189
fprintf_plus(stderr, "Failed to get flags for interface "
1190
"\"%s\"\n", if_entry->d_name);
1191
}
1192
return 0;
1193
}
1194
1195
if(not good_flags(if_entry->d_name, &ifr)){
1196
return 0;
1197
}
1198
return 1;
1199
}
1200
1201
/*
1202
* This function determines if a directory entry in /sys/class/net
1203
* corresponds to an acceptable network device which is up.
1204
* (This function is passed to scandir(3) as a filter function.)
1205
*/
1206
int up_interface(const struct dirent *if_entry){
1207
if(if_entry->d_name[0] == '.'){
1208
return 0;
1209
}
1210
1211
struct ifreq ifr;
1212
if(not get_flags(if_entry->d_name, &ifr)){
1213
if(debug){
1214
fprintf_plus(stderr, "Failed to get flags for interface "
1215
"\"%s\"\n", if_entry->d_name);
1216
}
1217
return 0;
1218
}
1219
1220
/* Reject down interfaces */
1221
if(not (ifr.ifr_flags & IFF_UP)){
1222
if(debug){
1223
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1224
if_entry->d_name);
1225
}
1226
return 0;
1227
}
1228
1229
/* Reject non-running interfaces */
1230
if(not (ifr.ifr_flags & IFF_RUNNING)){
1231
if(debug){
1232
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1233
if_entry->d_name);
1234
}
1235
return 0;
1236
}
1237
1238
if(not good_flags(if_entry->d_name, &ifr)){
1239
return 0;
1240
}
1241
return 1;
1242
}
1243
1244
int notdotentries(const struct dirent *direntry){
1245
/* Skip "." and ".." */
1246
if(direntry->d_name[0] == '.'
1247
and (direntry->d_name[1] == '\0'
1248
or (direntry->d_name[1] == '.'
1249
and direntry->d_name[2] == '\0'))){
1250
return 0;
1251
}
1252
return 1;
1253
}
1254
1255
/* Is this directory entry a runnable program? */
1256
int runnable_hook(const struct dirent *direntry){
1257
int ret;
1258
size_t sret;
1259
struct stat st;
1260
1261
if((direntry->d_name)[0] == '\0'){
1262
/* Empty name? */
1263
return 0;
1264
}
1265
1266
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1267
"abcdefghijklmnopqrstuvwxyz"
1268
"0123456789"
1269
"_-");
1270
if((direntry->d_name)[sret] != '\0'){
1271
/* Contains non-allowed characters */
1272
if(debug){
1273
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1274
direntry->d_name);
1275
}
1276
return 0;
1277
}
1278
1279
char *fullname = NULL;
1280
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1281
if(ret < 0){
1282
perror_plus("asprintf");
1283
return 0;
1284
}
1285
1286
ret = stat(fullname, &st);
1287
if(ret == -1){
1288
if(debug){
1289
perror_plus("Could not stat hook");
1290
}
1291
return 0;
1292
}
1293
if(not (S_ISREG(st.st_mode))){
1294
/* Not a regular file */
1295
if(debug){
1296
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1297
direntry->d_name);
1298
}
1299
return 0;
1300
}
1301
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1302
/* Not executable */
1303
if(debug){
1304
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1305
direntry->d_name);
1306
}
1307
return 0;
1308
}
1309
if(debug){
1310
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1311
direntry->d_name);
1312
}
1313
return 1;
1314
}
1315
1316
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1317
int ret;
1318
struct timespec now;
1319
struct timespec waited_time;
1320
intmax_t block_time;
1321
1322
while(true){
1323
if(mc.current_server == NULL){
1324
if (debug){
1325
fprintf_plus(stderr, "Wait until first server is found."
1326
" No timeout!\n");
1327
}
1328
ret = avahi_simple_poll_iterate(s, -1);
1329
} else {
1330
if (debug){
1331
fprintf_plus(stderr, "Check current_server if we should run"
1332
" it, or wait\n");
1333
}
1334
/* the current time */
1335
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1336
if(ret == -1){
1337
perror_plus("clock_gettime");
1338
return -1;
1339
}
1340
/* Calculating in ms how long time between now and server
1341
who we visted longest time ago. Now - last seen. */
1342
waited_time.tv_sec = (now.tv_sec
1343
- mc.current_server->last_seen.tv_sec);
1344
waited_time.tv_nsec = (now.tv_nsec
1345
- mc.current_server->last_seen.tv_nsec);
1346
/* total time is 10s/10,000ms.
1347
Converting to s from ms by dividing by 1,000,
1348
and ns to ms by dividing by 1,000,000. */
1349
block_time = ((retry_interval
1350
- ((intmax_t)waited_time.tv_sec * 1000))
1351
- ((intmax_t)waited_time.tv_nsec / 1000000));
1352
1353
if (debug){
1354
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1355
block_time);
1356
}
1357
1358
if(block_time <= 0){
1359
ret = start_mandos_communication(mc.current_server->ip,
1360
mc.current_server->port,
1361
mc.current_server->if_index,
1362
mc.current_server->af);
1363
if(ret == 0){
1364
avahi_simple_poll_quit(mc.simple_poll);
1365
return 0;
1366
}
1367
ret = clock_gettime(CLOCK_MONOTONIC,
1368
&mc.current_server->last_seen);
1369
if(ret == -1){
1370
perror_plus("clock_gettime");
1371
return -1;
1372
}
1373
mc.current_server = mc.current_server->next;
1374
block_time = 0; /* Call avahi to find new Mandos
1375
servers, but don't block */
1376
}
1377
1378
ret = avahi_simple_poll_iterate(s, (int)block_time);
1379
}
1380
if(ret != 0){
1381
if (ret > 0 or errno != EINTR){
1382
return (ret != 1) ? ret : 0;
1383
}
1384
}
1385
}
1386
}
1387
1388
bool run_network_hooks(const char *mode, const char *interface,
1389
const float delay){
1390
struct dirent **direntries;
1391
struct dirent *direntry;
1392
int ret;
1393
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1394
alphasort);
1395
if(numhooks == -1){
1396
perror_plus("scandir");
1397
} else {
1398
int devnull = open("/dev/null", O_RDONLY);
1399
for(int i = 0; i < numhooks; i++){
1400
direntry = direntries[i];
1401
char *fullname = NULL;
1402
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1403
if(ret < 0){
1404
perror_plus("asprintf");
1405
continue;
1406
}
1407
if(debug){
1408
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1409
direntry->d_name);
1410
}
1411
pid_t hook_pid = fork();
1412
if(hook_pid == 0){
1413
/* Child */
1414
/* Raise privileges */
1415
errno = 0;
1416
ret = seteuid(0);
1417
if(ret == -1){
1418
perror_plus("seteuid");
1419
}
1420
/* Raise privileges even more */
1421
errno = 0;
1422
ret = setuid(0);
1423
if(ret == -1){
1424
perror_plus("setuid");
1425
}
1426
/* Set group */
1427
errno = 0;
1428
ret = setgid(0);
1429
if(ret == -1){
1430
perror_plus("setgid");
1431
}
1432
/* Reset supplementary groups */
1433
errno = 0;
1434
ret = setgroups(0, NULL);
1435
if(ret == -1){
1436
perror_plus("setgroups");
1437
}
1438
dup2(devnull, STDIN_FILENO);
1439
close(devnull);
1440
dup2(STDERR_FILENO, STDOUT_FILENO);
1441
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1442
if(ret == -1){
1443
perror_plus("setenv");
1444
_exit(EX_OSERR);
1445
}
1446
ret = setenv("DEVICE", interface, 1);
1447
if(ret == -1){
1448
perror_plus("setenv");
1449
_exit(EX_OSERR);
1450
}
1451
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1452
if(ret == -1){
1453
perror_plus("setenv");
1454
_exit(EX_OSERR);
1455
}
1456
ret = setenv("MODE", mode, 1);
1457
if(ret == -1){
1458
perror_plus("setenv");
1459
_exit(EX_OSERR);
1460
}
1461
char *delaystring;
1462
ret = asprintf(&delaystring, "%f", delay);
1463
if(ret == -1){
1464
perror_plus("asprintf");
1465
_exit(EX_OSERR);
1466
}
1467
ret = setenv("DELAY", delaystring, 1);
1468
if(ret == -1){
1469
free(delaystring);
1470
perror_plus("setenv");
1471
_exit(EX_OSERR);
1472
}
1473
free(delaystring);
1474
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1475
perror_plus("execl");
1476
_exit(EXIT_FAILURE);
1477
}
1478
} else {
1479
int status;
1480
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1481
perror_plus("waitpid");
1482
free(fullname);
1483
continue;
1484
}
1485
if(WIFEXITED(status)){
1486
if(WEXITSTATUS(status) != 0){
1487
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1488
" with status %d\n", direntry->d_name,
1489
WEXITSTATUS(status));
1490
free(fullname);
1491
continue;
1492
}
1493
} else if(WIFSIGNALED(status)){
1494
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1495
" signal %d\n", direntry->d_name,
1496
WTERMSIG(status));
1497
free(fullname);
1498
continue;
1499
} else {
1500
fprintf_plus(stderr, "Warning: network hook \"%s\""
1501
" crashed\n", direntry->d_name);
1502
free(fullname);
1503
continue;
1504
}
1505
}
1506
free(fullname);
1507
if(debug){
1508
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1509
direntry->d_name);
1510
}
1511
}
1512
close(devnull);
1513
}
1514
return true;
1515
}
1516
1517
824
int main(int argc, char *argv[]){
1518
825
AvahiSServiceBrowser *sb = NULL;
1519
826
int error;
1520
827
int ret;
1521
828
intmax_t tmpmax;
1522
char *tmp;
829
int numchars;
1523
830
int exitcode = EXIT_SUCCESS;
1524
const char *interface = "";
831
const char *interface = "eth0";
1525
832
struct ifreq network;
1526
int sd = -1;
1527
bool take_down_interface = false;
833
int sd;
1528
834
uid_t uid;
1529
835
gid_t gid;
836
char *connect_to = NULL;
1530
837
char tempdir[] = "/tmp/mandosXXXXXX";
1531
838
bool tempdir_created = false;
1532
839
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1533
840
const char *seckey = PATHDIR "/" SECKEY;
1534
841
const char *pubkey = PATHDIR "/" PUBKEY;
1535
842
843
mandos_context mc = { .simple_poll = NULL, .server = NULL,
844
.dh_bits = 1024, .priority = "SECURE256"
845
":!CTYPE-X.509:+CTYPE-OPENPGP" };
1536
846
bool gnutls_initialized = false;
1537
847
bool gpgme_initialized = false;
1538
float delay = 2.5f;
1539
double retry_interval = 10; /* 10s between trying a server and
1540
retrying the same server again */
1541
1542
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1543
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1544
1545
uid = getuid();
1546
gid = getgid();
1547
1548
/* Lower any group privileges we might have, just to be safe */
1549
errno = 0;
1550
ret = setgid(gid);
1551
if(ret == -1){
1552
perror_plus("setgid");
1553
}
1554
1555
/* Lower user privileges (temporarily) */
1556
errno = 0;
1557
ret = seteuid(uid);
1558
if(ret == -1){
1559
perror_plus("seteuid");
1560
}
1561
1562
if(quit_now){
1563
goto end;
1564
}
848
double delay = 2.5;
1565
849
1566
850
{
1567
851
struct argp_option options[] = {
1573
857
.group = 1 },
1574
858
{ .name = "interface", .key = 'i',
1575
859
.arg = "NAME",
1576
.doc = "Network interface that will be used to search for"
1577
" Mandos servers",
860
.doc = "Interface that will be used to search for Mandos"
861
" servers",
1578
862
.group = 1 },
1579
863
{ .name = "seckey", .key = 's',
1580
864
.arg = "FILE",
1597
881
.arg = "SECONDS",
1598
882
.doc = "Maximum delay to wait for interface startup",
1599
883
.group = 2 },
1600
{ .name = "retry", .key = 132,
1601
.arg = "SECONDS",
1602
.doc = "Retry interval used when denied by the mandos server",
1603
.group = 2 },
1604
{ .name = "network-hook-dir", .key = 133,
1605
.arg = "DIR",
1606
.doc = "Directory where network hooks are located",
1607
.group = 2 },
1608
/*
1609
* These reproduce what we would get without ARGP_NO_HELP
1610
*/
1611
{ .name = "help", .key = '?',
1612
.doc = "Give this help list", .group = -1 },
1613
{ .name = "usage", .key = -3,
1614
.doc = "Give a short usage message", .group = -1 },
1615
{ .name = "version", .key = 'V',
1616
.doc = "Print program version", .group = -1 },
1617
884
{ .name = NULL }
1618
885
};
1619
886
1620
887
error_t parse_opt(int key, char *arg,
1621
888
struct argp_state *state){
1622
errno = 0;
1623
889
switch(key){
1624
890
case 128: /* --debug */
1625
891
debug = true;
1637
903
pubkey = arg;
1638
904
break;
1639
905
case 129: /* --dh-bits */
1640
errno = 0;
1641
tmpmax = strtoimax(arg, &tmp, 10);
1642
if(errno != 0 or tmp == arg or *tmp != '\0'
1643
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1644
argp_error(state, "Bad number of DH bits");
906
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
907
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
908
or arg[numchars] != '\0'){
909
fprintf(stderr, "Bad number of DH bits\n");
910
exit(EXIT_FAILURE);
1645
911
}
1646
912
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1647
913
break;
1649
915
mc.priority = arg;
1650
916
break;
1651
917
case 131: /* --delay */
1652
errno = 0;
1653
delay = strtof(arg, &tmp);
1654
if(errno != 0 or tmp == arg or *tmp != '\0'){
1655
argp_error(state, "Bad delay");
1656
}
1657
case 132: /* --retry */
1658
errno = 0;
1659
retry_interval = strtod(arg, &tmp);
1660
if(errno != 0 or tmp == arg or *tmp != '\0'
1661
or (retry_interval * 1000) > INT_MAX
1662
or retry_interval < 0){
1663
argp_error(state, "Bad retry interval");
1664
}
1665
break;
1666
case 133: /* --network-hook-dir */
1667
hookdir = arg;
1668
break;
1669
/*
1670
* These reproduce what we would get without ARGP_NO_HELP
1671
*/
1672
case '?': /* --help */
1673
argp_state_help(state, state->out_stream,
1674
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1675
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1676
case -3: /* --usage */
1677
argp_state_help(state, state->out_stream,
1678
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1679
case 'V': /* --version */
1680
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1681
exit(argp_err_exit_status);
918
ret = sscanf(arg, "%lf%n", &delay, &numchars);
919
if(ret < 1 or arg[numchars] != '\0'){
920
fprintf(stderr, "Bad delay\n");
921
exit(EXIT_FAILURE);
922
}
923
break;
924
case ARGP_KEY_ARG:
925
argp_usage(state);
926
case ARGP_KEY_END:
1682
927
break;
1683
928
default:
1684
929
return ARGP_ERR_UNKNOWN;
1685
930
}
1686
return errno;
931
return 0;
1687
932
}
1688
933
1689
934
struct argp argp = { .options = options, .parser = parse_opt,
1690
935
.args_doc = "",
1691
936
.doc = "Mandos client -- Get and decrypt"
1692
937
" passwords from a Mandos server" };
1693
ret = argp_parse(&argp, argc, argv,
1694
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1695
switch(ret){
1696
case 0:
1697
break;
1698
case ENOMEM:
1699
default:
1700
errno = ret;
1701
perror_plus("argp_parse");
1702
exitcode = EX_OSERR;
1703
goto end;
1704
case EINVAL:
1705
exitcode = EX_USAGE;
1706
goto end;
1707
}
1708
}
1709
1710
{
1711
/* Work around Debian bug #633582:
1712
<http://bugs.debian.org/633582> */
1713
1714
/* Re-raise priviliges */
1715
errno = 0;
1716
ret = seteuid(0);
1717
if(ret == -1){
1718
perror_plus("seteuid");
1719
} else {
1720
struct stat st;
1721
1722
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1723
int seckey_fd = open(seckey, O_RDONLY);
1724
if(seckey_fd == -1){
1725
perror_plus("open");
1726
} else {
1727
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1728
if(ret == -1){
1729
perror_plus("fstat");
1730
} else {
1731
if(S_ISREG(st.st_mode)
1732
and st.st_uid == 0 and st.st_gid == 0){
1733
ret = fchown(seckey_fd, uid, gid);
1734
if(ret == -1){
1735
perror_plus("fchown");
1736
}
1737
}
1738
}
1739
TEMP_FAILURE_RETRY(close(seckey_fd));
1740
}
1741
}
1742
1743
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1744
int pubkey_fd = open(pubkey, O_RDONLY);
1745
if(pubkey_fd == -1){
1746
perror_plus("open");
1747
} else {
1748
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1749
if(ret == -1){
1750
perror_plus("fstat");
1751
} else {
1752
if(S_ISREG(st.st_mode)
1753
and st.st_uid == 0 and st.st_gid == 0){
1754
ret = fchown(pubkey_fd, uid, gid);
1755
if(ret == -1){
1756
perror_plus("fchown");
1757
}
1758
}
1759
}
1760
TEMP_FAILURE_RETRY(close(pubkey_fd));
1761
}
1762
}
1763
1764
/* Lower privileges */
1765
errno = 0;
1766
ret = seteuid(uid);
1767
if(ret == -1){
1768
perror_plus("seteuid");
1769
}
1770
}
1771
}
1772
1773
/* Run network hooks */
1774
if(not run_network_hooks("start", interface, delay)){
1775
goto end;
1776
}
1777
1778
if(not debug){
1779
avahi_set_log_function(empty_log);
1780
}
1781
1782
if(interface[0] == '\0'){
1783
struct dirent **direntries;
1784
/* First look for interfaces that are up */
1785
ret = scandir(sys_class_net, &direntries, up_interface,
1786
alphasort);
1787
if(ret == 0){
1788
/* No up interfaces, look for any good interfaces */
1789
free(direntries);
1790
ret = scandir(sys_class_net, &direntries, good_interface,
1791
alphasort);
1792
}
1793
if(ret >= 1){
1794
/* Pick the first interface returned */
1795
interface = strdup(direntries[0]->d_name);
1796
if(debug){
1797
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1798
}
1799
if(interface == NULL){
1800
perror_plus("malloc");
1801
free(direntries);
1802
exitcode = EXIT_FAILURE;
1803
goto end;
1804
}
1805
free(direntries);
1806
} else {
1807
free(direntries);
1808
fprintf_plus(stderr, "Could not find a network interface\n");
938
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
939
if(ret == ARGP_ERR_UNKNOWN){
940
fprintf(stderr, "Unknown error while parsing arguments\n");
1809
941
exitcode = EXIT_FAILURE;
1810
942
goto end;
1811
943
}
1812
944
}
1813
945
1814
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1815
from the signal handler */
1816
/* Initialize the pseudo-RNG for Avahi */
1817
srand((unsigned int) time(NULL));
1818
mc.simple_poll = avahi_simple_poll_new();
1819
if(mc.simple_poll == NULL){
1820
fprintf_plus(stderr,
1821
"Avahi: Failed to create simple poll object.\n");
1822
exitcode = EX_UNAVAILABLE;
1823
goto end;
1824
}
1825
1826
sigemptyset(&sigterm_action.sa_mask);
1827
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1828
if(ret == -1){
1829
perror_plus("sigaddset");
1830
exitcode = EX_OSERR;
1831
goto end;
1832
}
1833
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1834
if(ret == -1){
1835
perror_plus("sigaddset");
1836
exitcode = EX_OSERR;
1837
goto end;
1838
}
1839
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1840
if(ret == -1){
1841
perror_plus("sigaddset");
1842
exitcode = EX_OSERR;
1843
goto end;
1844
}
1845
/* Need to check if the handler is SIG_IGN before handling:
1846
| [[info:libc:Initial Signal Actions]] |
1847
| [[info:libc:Basic Signal Handling]] |
1848
*/
1849
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1850
if(ret == -1){
1851
perror_plus("sigaction");
1852
return EX_OSERR;
1853
}
1854
if(old_sigterm_action.sa_handler != SIG_IGN){
1855
ret = sigaction(SIGINT, &sigterm_action, NULL);
1856
if(ret == -1){
1857
perror_plus("sigaction");
1858
exitcode = EX_OSERR;
1859
goto end;
1860
}
1861
}
1862
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1863
if(ret == -1){
1864
perror_plus("sigaction");
1865
return EX_OSERR;
1866
}
1867
if(old_sigterm_action.sa_handler != SIG_IGN){
1868
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1869
if(ret == -1){
1870
perror_plus("sigaction");
1871
exitcode = EX_OSERR;
1872
goto end;
1873
}
1874
}
1875
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1876
if(ret == -1){
1877
perror_plus("sigaction");
1878
return EX_OSERR;
1879
}
1880
if(old_sigterm_action.sa_handler != SIG_IGN){
1881
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1882
if(ret == -1){
1883
perror_plus("sigaction");
1884
exitcode = EX_OSERR;
1885
goto end;
1886
}
1887
}
1888
1889
946
/* If the interface is down, bring it up */
1890
if(strcmp(interface, "none") != 0){
1891
if_index = (AvahiIfIndex) if_nametoindex(interface);
1892
if(if_index == 0){
1893
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1894
exitcode = EX_UNAVAILABLE;
1895
goto end;
1896
}
1897
1898
if(quit_now){
1899
goto end;
1900
}
1901
1902
/* Re-raise priviliges */
1903
errno = 0;
1904
ret = seteuid(0);
1905
if(ret == -1){
1906
perror_plus("seteuid");
1907
}
1908
947
{
1909
948
#ifdef __linux__
1910
949
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1911
messages about the network interface to mess up the prompt */
950
messages to mess up the prompt */
1912
951
ret = klogctl(8, NULL, 5);
1913
bool restore_loglevel = true;
1914
952
if(ret == -1){
1915
restore_loglevel = false;
1916
perror_plus("klogctl");
953
perror("klogctl");
1917
954
}
1918
#endif /* __linux__ */
955
#endif
1919
956
1920
957
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1921
958
if(sd < 0){
1922
perror_plus("socket");
1923
exitcode = EX_OSERR;
959
perror("socket");
960
exitcode = EXIT_FAILURE;
1924
961
#ifdef __linux__
1925
if(restore_loglevel){
1926
ret = klogctl(7, NULL, 0);
1927
if(ret == -1){
1928
perror_plus("klogctl");
1929
}
1930
}
1931
#endif /* __linux__ */
1932
/* Lower privileges */
1933
errno = 0;
1934
ret = seteuid(uid);
962
ret = klogctl(7, NULL, 0);
1935
963
if(ret == -1){
1936
perror_plus("seteuid");
964
perror("klogctl");
1937
965
}
966
#endif
1938
967
goto end;
1939
968
}
1940
969
strcpy(network.ifr_name, interface);
1941
970
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1942
971
if(ret == -1){
1943
perror_plus("ioctl SIOCGIFFLAGS");
972
perror("ioctl SIOCGIFFLAGS");
1944
973
#ifdef __linux__
1945
if(restore_loglevel){
1946
ret = klogctl(7, NULL, 0);
1947
if(ret == -1){
1948
perror_plus("klogctl");
1949
}
1950
}
1951
#endif /* __linux__ */
1952
exitcode = EX_OSERR;
1953
/* Lower privileges */
1954
errno = 0;
1955
ret = seteuid(uid);
974
ret = klogctl(7, NULL, 0);
1956
975
if(ret == -1){
1957
perror_plus("seteuid");
976
perror("klogctl");
1958
977
}
978
#endif
979
exitcode = EXIT_FAILURE;
1959
980
goto end;
1960
981
}
1961
982
if((network.ifr_flags & IFF_UP) == 0){
1962
983
network.ifr_flags |= IFF_UP;
1963
take_down_interface = true;
1964
984
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1965
985
if(ret == -1){
1966
take_down_interface = false;
1967
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1968
exitcode = EX_OSERR;
986
perror("ioctl SIOCSIFFLAGS");
987
exitcode = EXIT_FAILURE;
1969
988
#ifdef __linux__
1970
if(restore_loglevel){
1971
ret = klogctl(7, NULL, 0);
1972
if(ret == -1){
1973
perror_plus("klogctl");
1974
}
1975
}
1976
#endif /* __linux__ */
1977
/* Lower privileges */
1978
errno = 0;
1979
ret = seteuid(uid);
989
ret = klogctl(7, NULL, 0);
1980
990
if(ret == -1){
1981
perror_plus("seteuid");
991
perror("klogctl");
1982
992
}
993
#endif
1983
994
goto end;
1984
995
}
1985
996
}
1986
/* Sleep checking until interface is running.
1987
Check every 0.25s, up to total time of delay */
997
/* sleep checking until interface is running */
1988
998
for(int i=0; i < delay * 4; i++){
1989
999
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1990
1000
if(ret == -1){
1991
perror_plus("ioctl SIOCGIFFLAGS");
1001
perror("ioctl SIOCGIFFLAGS");
1992
1002
} else if(network.ifr_flags & IFF_RUNNING){
1993
1003
break;
1994
1004
}
1995
1005
struct timespec sleeptime = { .tv_nsec = 250000000 };
1996
1006
ret = nanosleep(&sleeptime, NULL);
1997
1007
if(ret == -1 and errno != EINTR){
1998
perror_plus("nanosleep");
1008
perror("nanosleep");
1999
1009
}
2000
1010
}
2001
if(not take_down_interface){
2002
/* We won't need the socket anymore */
2003
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2004
if(ret == -1){
2005
perror_plus("close");
2006
}
1011
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1012
if(ret == -1){
1013
perror("close");
2007
1014
}
2008
1015
#ifdef __linux__
2009
if(restore_loglevel){
2010
/* Restores kernel loglevel to default */
2011
ret = klogctl(7, NULL, 0);
2012
if(ret == -1){
2013
perror_plus("klogctl");
2014
}
2015
}
2016
#endif /* __linux__ */
2017
/* Lower privileges */
2018
errno = 0;
2019
/* Lower privileges */
2020
ret = seteuid(uid);
1016
/* Restores kernel loglevel to default */
1017
ret = klogctl(7, NULL, 0);
2021
1018
if(ret == -1){
2022
perror_plus("seteuid");
1019
perror("klogctl");
2023
1020
}
2024
}
2025
2026
if(quit_now){
2027
goto end;
2028
}
2029
2030
ret = init_gnutls_global(pubkey, seckey);
2031
if(ret == -1){
2032
fprintf_plus(stderr, "init_gnutls_global failed\n");
2033
exitcode = EX_UNAVAILABLE;
1021
#endif
1022
}
1023
1024
uid = getuid();
1025
gid = getgid();
1026
1027
setgid(gid);
1028
if(ret == -1){
1029
perror("setgid");
1030
}
1031
1032
ret = setuid(uid);
1033
if(ret == -1){
1034
perror("setuid");
1035
}
1036
1037
ret = init_gnutls_global(&mc, pubkey, seckey);
1038
if(ret == -1){
1039
fprintf(stderr, "init_gnutls_global failed\n");
1040
exitcode = EXIT_FAILURE;
2034
1041
goto end;
2035
1042
} else {
2036
1043
gnutls_initialized = true;
2037
1044
}
2038
1045
2039
if(quit_now){
2040
goto end;
2041
}
2042
2043
1046
if(mkdtemp(tempdir) == NULL){
2044
perror_plus("mkdtemp");
1047
perror("mkdtemp");
2045
1048
goto end;
2046
1049
}
2047
1050
tempdir_created = true;
2048
1051
2049
if(quit_now){
2050
goto end;
2051
}
2052
2053
if(not init_gpgme(pubkey, seckey, tempdir)){
2054
fprintf_plus(stderr, "init_gpgme failed\n");
2055
exitcode = EX_UNAVAILABLE;
1052
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
1053
fprintf(stderr, "init_gpgme failed\n");
1054
exitcode = EXIT_FAILURE;
2056
1055
goto end;
2057
1056
} else {
2058
1057
gpgme_initialized = true;
2059
1058
}
2060
1059
2061
if(quit_now){
1060
if_index = (AvahiIfIndex) if_nametoindex(interface);
1061
if(if_index == 0){
1062
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1063
exitcode = EXIT_FAILURE;
2062
1064
goto end;
2063
1065
}
2064
1066
2067
1069
/* (Mainly meant for debugging) */
2068
1070
char *address = strrchr(connect_to, ':');
2069
1071
if(address == NULL){
2070
fprintf_plus(stderr, "No colon in address\n");
2071
exitcode = EX_USAGE;
2072
goto end;
2073
}
2074
2075
if(quit_now){
2076
goto end;
2077
}
2078
1072
fprintf(stderr, "No colon in address\n");
1073
exitcode = EXIT_FAILURE;
1074
goto end;
1075
}
2079
1076
uint16_t port;
2080
errno = 0;
2081
tmpmax = strtoimax(address+1, &tmp, 10);
2082
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2083
or tmpmax != (uint16_t)tmpmax){
2084
fprintf_plus(stderr, "Bad port number\n");
2085
exitcode = EX_USAGE;
2086
goto end;
2087
}
2088
2089
if(quit_now){
2090
goto end;
2091
}
2092
1077
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1078
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1079
or address[numchars+1] != '\0'){
1080
fprintf(stderr, "Bad port number\n");
1081
exitcode = EXIT_FAILURE;
1082
goto end;
1083
}
2093
1084
port = (uint16_t)tmpmax;
2094
1085
*address = '\0';
2095
/* Colon in address indicates IPv6 */
2096
int af;
2097
if(strchr(connect_to, ':') != NULL){
2098
af = AF_INET6;
2099
/* Accept [] around IPv6 address - see RFC 5952 */
2100
if(connect_to[0] == '[' and address[-1] == ']')
2101
{
2102
connect_to++;
2103
address[-1] = '\0';
2104
}
2105
} else {
2106
af = AF_INET;
2107
}
2108
1086
address = connect_to;
2109
2110
if(quit_now){
2111
goto end;
2112
}
2113
2114
while(not quit_now){
2115
ret = start_mandos_communication(address, port, if_index, af);
2116
if(quit_now or ret == 0){
2117
break;
2118
}
2119
if(debug){
2120
fprintf_plus(stderr, "Retrying in %d seconds\n",
2121
(int)retry_interval);
2122
}
2123
sleep((int)retry_interval);
2124
}
2125
2126
if (not quit_now){
1087
ret = start_mandos_communication(address, port, if_index, &mc);
1088
if(ret < 0){
1089
exitcode = EXIT_FAILURE;
1090
} else {
2127
1091
exitcode = EXIT_SUCCESS;
2128
1092
}
2129
2130
1093
goto end;
2131
1094
}
2132
1095
2133
if(quit_now){
1096
if(not debug){
1097
avahi_set_log_function(empty_log);
1098
}
1099
1100
/* Initialize the pseudo-RNG for Avahi */
1101
srand((unsigned int) time(NULL));
1102
1103
/* Allocate main Avahi loop object */
1104
mc.simple_poll = avahi_simple_poll_new();
1105
if(mc.simple_poll == NULL){
1106
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1107
exitcode = EXIT_FAILURE;
2134
1108
goto end;
2135
1109
}
2136
1110
2154
1128
2155
1129
/* Check if creating the Avahi server object succeeded */
2156
1130
if(mc.server == NULL){
2157
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2158
avahi_strerror(error));
2159
exitcode = EX_UNAVAILABLE;
2160
goto end;
2161
}
2162
2163
if(quit_now){
1131
fprintf(stderr, "Failed to create Avahi server: %s\n",
1132
avahi_strerror(error));
1133
exitcode = EXIT_FAILURE;
2164
1134
goto end;
2165
1135
}
2166
1136
2167
1137
/* Create the Avahi service browser */
2168
1138
sb = avahi_s_service_browser_new(mc.server, if_index,
2169
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2170
NULL, 0, browse_callback, NULL);
1139
AVAHI_PROTO_INET6, "_mandos._tcp",
1140
NULL, 0, browse_callback, &mc);
2171
1141
if(sb == NULL){
2172
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2173
avahi_strerror(avahi_server_errno(mc.server)));
2174
exitcode = EX_UNAVAILABLE;
2175
goto end;
2176
}
2177
2178
if(quit_now){
1142
fprintf(stderr, "Failed to create service browser: %s\n",
1143
avahi_strerror(avahi_server_errno(mc.server)));
1144
exitcode = EXIT_FAILURE;
2179
1145
goto end;
2180
1146
}
2181
1147
2182
1148
/* Run the main loop */
2183
1149
2184
1150
if(debug){
2185
fprintf_plus(stderr, "Starting Avahi loop search\n");
2186
}
2187
2188
ret = avahi_loop_with_timeout(mc.simple_poll,
2189
(int)(retry_interval * 1000));
2190
if(debug){
2191
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2192
(ret == 0) ? "successfully" : "with error");
2193
}
1151
fprintf(stderr, "Starting Avahi loop search\n");
1152
}
1153
1154
avahi_simple_poll_loop(mc.simple_poll);
2194
1155
2195
1156
end:
2196
1157
2197
1158
if(debug){
2198
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1159
fprintf(stderr, "%s exiting\n", argv[0]);
2199
1160
}
2200
1161
2201
1162
/* Cleanup things */
2218
1179
gpgme_release(mc.ctx);
2219
1180
}
2220
1181
2221
/* Cleans up the circular linked list of Mandos servers the client
2222
has seen */
2223
if(mc.current_server != NULL){
2224
mc.current_server->prev->next = NULL;
2225
while(mc.current_server != NULL){
2226
server *next = mc.current_server->next;
2227
free(mc.current_server);
2228
mc.current_server = next;
2229
}
2230
}
2231
2232
/* Run network hooks */
2233
run_network_hooks("stop", interface, delay);
2234
2235
/* Re-raise priviliges */
2236
{
2237
errno = 0;
2238
ret = seteuid(0);
2239
if(ret == -1){
2240
perror_plus("seteuid");
2241
}
2242
2243
/* Take down the network interface */
2244
if(take_down_interface and geteuid() == 0){
2245
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2246
if(ret == -1){
2247
perror_plus("ioctl SIOCGIFFLAGS");
2248
} else if(network.ifr_flags & IFF_UP){
2249
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2250
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2251
if(ret == -1){
2252
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2253
}
2254
}
2255
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2256
if(ret == -1){
2257
perror_plus("close");
2258
}
2259
}
2260
}
2261
/* Lower privileges permanently */
2262
errno = 0;
2263
ret = setuid(uid);
2264
if(ret == -1){
2265
perror_plus("setuid");
2266
}
2267
2268
/* Removes the GPGME temp directory and all files inside */
1182
/* Removes the temp directory used by GPGME */
2269
1183
if(tempdir_created){
2270
struct dirent **direntries = NULL;
2271
struct dirent *direntry = NULL;
2272
int numentries = scandir(tempdir, &direntries, notdotentries,
2273
alphasort);
2274
if (numentries > 0){
2275
for(int i = 0; i < numentries; i++){
2276
direntry = direntries[i];
1184
DIR *d;
1185
struct dirent *direntry;
1186
d = opendir(tempdir);
1187
if(d == NULL){
1188
if(errno != ENOENT){
1189
perror("opendir");
1190
}
1191
} else {
1192
while(true){
1193
direntry = readdir(d);
1194
if(direntry == NULL){
1195
break;
1196
}
1197
/* Skip "." and ".." */
1198
if(direntry->d_name[0] == '.'
1199
and (direntry->d_name[1] == '\0'
1200
or (direntry->d_name[1] == '.'
1201
and direntry->d_name[2] == '\0'))){
1202
continue;
1203
}
2277
1204
char *fullname = NULL;
2278
1205
ret = asprintf(&fullname, "%s/%s", tempdir,
2279
1206
direntry->d_name);
2280
1207
if(ret < 0){
2281
perror_plus("asprintf");
1208
perror("asprintf");
2282
1209
continue;
2283
1210
}
2284
1211
ret = remove(fullname);
2285
1212
if(ret == -1){
2286
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2287
strerror(errno));
1213
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1214
strerror(errno));
2288
1215
}
2289
1216
free(fullname);
2290
1217
}
2291
}
2292
2293
/* need to clean even if 0 because man page doesn't specify */
2294
free(direntries);
2295
if (numentries == -1){
2296
perror_plus("scandir");
1218
closedir(d);
2297
1219
}
2298
1220
ret = rmdir(tempdir);
2299
1221
if(ret == -1 and errno != ENOENT){
2300
perror_plus("rmdir");
2301
}
2302
}
2303
2304
if(quit_now){
2305
sigemptyset(&old_sigterm_action.sa_mask);
2306
old_sigterm_action.sa_handler = SIG_DFL;
2307
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2308
&old_sigterm_action,
2309
NULL));
2310
if(ret == -1){
2311
perror_plus("sigaction");
2312
}
2313
do {
2314
ret = raise(signal_received);
2315
} while(ret != 0 and errno == EINTR);
2316
if(ret != 0){
2317
perror_plus("raise");
2318
abort();
2319
}
2320
TEMP_FAILURE_RETRY(pause());
1222
perror("rmdir");
1223
}
2321
1224
}
2322
1225
2323
1226
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0