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» Revision
237.2.40
(compared to revision 237.7.220)
: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2009-01-18 06:41:57 UTC
- mto: (24.1.127 mandos) (237.4.2 mandos-pipe-ipc) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 249.
- Revision ID: teddy@fukt.bsnet.se-20090118064157-8o4oia1y0t8di0xj
* debian/mandos-client.lintian-overrides: Remove override for
unbreakable line in
plugin-runner manual page.
* plugin-runner.xml (EXAMPLES): Make long command line more breakable.
unbreakable line in
plugin-runner manual page.
* plugin-runner.xml (EXAMPLES): Make long command line more breakable.
- 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 © 2008-2013 Teddy Hogeborn
13
* Copyright © 2008-2013 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() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
39
stdout, ferror(), sscanf */
40
#include <stdint.h> /* uint16_t, uint32_t */
45
41
#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 */
42
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
43
srand() */
44
#include <stdbool.h> /* bool, true */
49
45
#include <string.h> /* memset(), strcmp(), strlen(),
50
46
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
47
#include <sys/ioctl.h> /* ioctl */
52
48
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
49
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
50
SOCK_STREAM, INET6_ADDRSTRLEN,
51
uid_t, gid_t, open(), opendir(),
52
DIR */
53
#include <sys/stat.h> /* open() */
57
54
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect(),
59
getnameinfo() */
55
struct in6_addr, inet_pton(),
56
connect() */
60
57
#include <fcntl.h> /* open() */
61
58
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
59
*/
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() */
60
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
61
#include <assert.h> /* assert() */
62
#include <errno.h> /* perror(), errno */
63
#include <time.h> /* time() */
68
64
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
65
SIOCSIFFLAGS, if_indextoname(),
70
66
if_nametoindex(), IF_NAMESIZE */
71
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
*/
67
#include <netinet/in.h>
74
68
#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 */
69
getuid(), getgid(), setuid(),
70
setgid() */
71
#include <arpa/inet.h> /* inet_pton(), htons */
72
#include <iso646.h> /* not, and, or */
79
73
#include <argp.h> /* struct argp_option, error_t, struct
80
74
argp_state, struct argp,
81
75
argp_parse(), ARGP_KEY_ARG,
82
76
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
77
102
78
/* Avahi */
103
79
/* All Avahi types, constants and functions
117
93
init_gnutls_session(),
118
94
GNUTLS_* */
119
95
#include <gnutls/openpgp.h>
120
/* gnutls_certificate_set_openpgp_key_file(),
121
GNUTLS_OPENPGP_FMT_BASE64 */
96
/* gnutls_certificate_set_openpgp_key_file(),
97
GNUTLS_OPENPGP_FMT_BASE64 */
122
98
123
99
/* GPGME */
124
100
#include <gpgme.h> /* All GPGME types, constants and
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
114
const char *argp_program_version = "mandos-client " VERSION;
140
const char *argp_program_bug_address = "<mandos@recompile.se>";
141
static const char sys_class_net[] = "/sys/class/net";
142
char *connect_to = NULL;
143
const char *hookdir = HOOKDIR;
144
uid_t uid = 65534;
145
gid_t gid = 65534;
146
147
/* Doubly linked list that need to be circularly linked when used */
148
typedef struct server{
149
const char *ip;
150
in_port_t port;
151
AvahiIfIndex if_index;
152
int af;
153
struct timespec last_seen;
154
struct server *next;
155
struct server *prev;
156
} server;
115
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
157
116
158
117
/* Used for passing in values through the Avahi callback functions */
159
118
typedef struct {
119
AvahiSimplePoll *simple_poll;
160
120
AvahiServer *server;
161
121
gnutls_certificate_credentials_t cred;
162
122
unsigned int dh_bits;
163
123
gnutls_dh_params_t dh_params;
164
124
const char *priority;
165
125
gpgme_ctx_t ctx;
166
server *current_server;
167
char *interfaces;
168
size_t interfaces_size;
169
126
} mandos_context;
170
127
171
/* global so signal handler can reach it*/
172
AvahiSimplePoll *simple_poll;
173
174
sig_atomic_t quit_now = 0;
175
int signal_received = 0;
176
177
/* Function to use when printing errors */
178
void perror_plus(const char *print_text){
179
int e = errno;
180
fprintf(stderr, "Mandos plugin %s: ",
181
program_invocation_short_name);
182
errno = e;
183
perror(print_text);
184
}
185
186
__attribute__((format (gnu_printf, 2, 3), nonnull))
187
int fprintf_plus(FILE *stream, const char *format, ...){
188
va_list ap;
189
va_start (ap, format);
190
191
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
192
program_invocation_short_name));
193
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
194
}
195
196
128
/*
197
* Make additional room in "buffer" for at least BUFFER_SIZE more
198
* 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,
199
131
* "buffer_length" is how much is already used.
200
132
*/
201
__attribute__((nonnull, warn_unused_result))
202
size_t incbuffer(char **buffer, size_t buffer_length,
203
size_t buffer_capacity){
133
size_t adjustbuffer(char **buffer, size_t buffer_length,
134
size_t buffer_capacity){
204
135
if(buffer_length + BUFFER_SIZE > buffer_capacity){
205
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
206
if(new_buf == NULL){
207
int old_errno = errno;
208
free(*buffer);
209
errno = old_errno;
210
*buffer = NULL;
136
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
137
if(buffer == NULL){
211
138
return 0;
212
139
}
213
*buffer = new_buf;
214
140
buffer_capacity += BUFFER_SIZE;
215
141
}
216
142
return buffer_capacity;
217
143
}
218
144
219
/* Add server to set of servers to retry periodically */
220
__attribute__((nonnull, warn_unused_result))
221
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
222
int af, server **current_server){
223
int ret;
224
server *new_server = malloc(sizeof(server));
225
if(new_server == NULL){
226
perror_plus("malloc");
227
return false;
228
}
229
*new_server = (server){ .ip = strdup(ip),
230
.port = port,
231
.if_index = if_index,
232
.af = af };
233
if(new_server->ip == NULL){
234
perror_plus("strdup");
235
return false;
236
}
237
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
238
if(ret == -1){
239
perror_plus("clock_gettime");
240
return false;
241
}
242
/* Special case of first server */
243
if(*current_server == NULL){
244
new_server->next = new_server;
245
new_server->prev = new_server;
246
*current_server = new_server;
247
} else {
248
/* Place the new server last in the list */
249
new_server->next = *current_server;
250
new_server->prev = (*current_server)->prev;
251
new_server->prev->next = new_server;
252
(*current_server)->prev = new_server;
253
}
254
return true;
255
}
256
257
145
/*
258
146
* Initialize GPGME.
259
147
*/
260
__attribute__((nonnull, warn_unused_result))
261
static bool init_gpgme(const char *seckey, const char *pubkey,
262
const char *tempdir, mandos_context *mc){
148
static bool init_gpgme(mandos_context *mc, const char *seckey,
149
const char *pubkey, const char *tempdir){
150
int ret;
263
151
gpgme_error_t rc;
264
152
gpgme_engine_info_t engine_info;
265
153
154
266
155
/*
267
* Helper function to insert pub and seckey to the engine keyring.
156
* Helper function to insert pub and seckey to the enigne keyring.
268
157
*/
269
158
bool import_key(const char *filename){
270
int ret;
271
159
int fd;
272
160
gpgme_data_t pgp_data;
273
161
274
162
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
275
163
if(fd == -1){
276
perror_plus("open");
164
perror("open");
277
165
return false;
278
166
}
279
167
280
168
rc = gpgme_data_new_from_fd(&pgp_data, fd);
281
169
if(rc != GPG_ERR_NO_ERROR){
282
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
283
gpgme_strsource(rc), gpgme_strerror(rc));
170
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
171
gpgme_strsource(rc), gpgme_strerror(rc));
284
172
return false;
285
173
}
286
174
287
175
rc = gpgme_op_import(mc->ctx, pgp_data);
288
176
if(rc != GPG_ERR_NO_ERROR){
289
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
290
gpgme_strsource(rc), gpgme_strerror(rc));
177
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
178
gpgme_strsource(rc), gpgme_strerror(rc));
291
179
return false;
292
180
}
293
181
294
182
ret = (int)TEMP_FAILURE_RETRY(close(fd));
295
183
if(ret == -1){
296
perror_plus("close");
184
perror("close");
297
185
}
298
186
gpgme_data_release(pgp_data);
299
187
return true;
300
188
}
301
189
302
190
if(debug){
303
fprintf_plus(stderr, "Initializing GPGME\n");
191
fprintf(stderr, "Initialize gpgme\n");
304
192
}
305
193
306
194
/* Init GPGME */
307
195
gpgme_check_version(NULL);
308
196
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
309
197
if(rc != GPG_ERR_NO_ERROR){
310
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
311
gpgme_strsource(rc), gpgme_strerror(rc));
198
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
199
gpgme_strsource(rc), gpgme_strerror(rc));
312
200
return false;
313
201
}
314
202
315
/* Set GPGME home directory for the OpenPGP engine only */
203
/* Set GPGME home directory for the OpenPGP engine only */
316
204
rc = gpgme_get_engine_info(&engine_info);
317
205
if(rc != GPG_ERR_NO_ERROR){
318
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
319
gpgme_strsource(rc), gpgme_strerror(rc));
206
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
207
gpgme_strsource(rc), gpgme_strerror(rc));
320
208
return false;
321
209
}
322
210
while(engine_info != NULL){
328
216
engine_info = engine_info->next;
329
217
}
330
218
if(engine_info == NULL){
331
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
332
tempdir);
219
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
333
220
return false;
334
221
}
335
222
336
223
/* Create new GPGME "context" */
337
224
rc = gpgme_new(&(mc->ctx));
338
225
if(rc != GPG_ERR_NO_ERROR){
339
fprintf_plus(stderr, "Mandos plugin mandos-client: "
340
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
341
gpgme_strerror(rc));
226
fprintf(stderr, "bad gpgme_new: %s: %s\n",
227
gpgme_strsource(rc), gpgme_strerror(rc));
342
228
return false;
343
229
}
344
230
346
232
return false;
347
233
}
348
234
349
return true;
235
return true;
350
236
}
351
237
352
238
/*
353
239
* Decrypt OpenPGP data.
354
240
* Returns -1 on error
355
241
*/
356
__attribute__((nonnull, warn_unused_result))
357
static ssize_t pgp_packet_decrypt(const char *cryptotext,
242
static ssize_t pgp_packet_decrypt(const mandos_context *mc,
243
const char *cryptotext,
358
244
size_t crypto_size,
359
char **plaintext,
360
mandos_context *mc){
245
char **plaintext){
361
246
gpgme_data_t dh_crypto, dh_plain;
362
247
gpgme_error_t rc;
363
248
ssize_t ret;
365
250
ssize_t plaintext_length = 0;
366
251
367
252
if(debug){
368
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
253
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
369
254
}
370
255
371
256
/* Create new GPGME data buffer from memory cryptotext */
372
257
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
373
258
0);
374
259
if(rc != GPG_ERR_NO_ERROR){
375
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
376
gpgme_strsource(rc), gpgme_strerror(rc));
260
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
261
gpgme_strsource(rc), gpgme_strerror(rc));
377
262
return -1;
378
263
}
379
264
380
265
/* Create new empty GPGME data buffer for the plaintext */
381
266
rc = gpgme_data_new(&dh_plain);
382
267
if(rc != GPG_ERR_NO_ERROR){
383
fprintf_plus(stderr, "Mandos plugin mandos-client: "
384
"bad gpgme_data_new: %s: %s\n",
385
gpgme_strsource(rc), gpgme_strerror(rc));
268
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
269
gpgme_strsource(rc), gpgme_strerror(rc));
386
270
gpgme_data_release(dh_crypto);
387
271
return -1;
388
272
}
391
275
data buffer */
392
276
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
393
277
if(rc != GPG_ERR_NO_ERROR){
394
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
395
gpgme_strsource(rc), gpgme_strerror(rc));
278
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
279
gpgme_strsource(rc), gpgme_strerror(rc));
396
280
plaintext_length = -1;
397
281
if(debug){
398
282
gpgme_decrypt_result_t result;
399
283
result = gpgme_op_decrypt_result(mc->ctx);
400
284
if(result == NULL){
401
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
285
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
402
286
} else {
403
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
404
result->unsupported_algorithm);
405
fprintf_plus(stderr, "Wrong key usage: %u\n",
406
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);
407
291
if(result->file_name != NULL){
408
fprintf_plus(stderr, "File name: %s\n", result->file_name);
292
fprintf(stderr, "File name: %s\n", result->file_name);
409
293
}
410
294
gpgme_recipient_t recipient;
411
295
recipient = result->recipients;
412
while(recipient != NULL){
413
fprintf_plus(stderr, "Public key algorithm: %s\n",
414
gpgme_pubkey_algo_name
415
(recipient->pubkey_algo));
416
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
417
fprintf_plus(stderr, "Secret key available: %s\n",
418
recipient->status == GPG_ERR_NO_SECKEY
419
? "No" : "Yes");
420
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
}
421
306
}
422
307
}
423
308
}
425
310
}
426
311
427
312
if(debug){
428
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
313
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
429
314
}
430
315
431
316
/* Seek back to the beginning of the GPGME plaintext data buffer */
432
317
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
433
perror_plus("gpgme_data_seek");
318
perror("gpgme_data_seek");
434
319
plaintext_length = -1;
435
320
goto decrypt_end;
436
321
}
437
322
438
323
*plaintext = NULL;
439
324
while(true){
440
plaintext_capacity = incbuffer(plaintext,
441
(size_t)plaintext_length,
442
plaintext_capacity);
325
plaintext_capacity = adjustbuffer(plaintext,
326
(size_t)plaintext_length,
327
plaintext_capacity);
443
328
if(plaintext_capacity == 0){
444
perror_plus("incbuffer");
445
plaintext_length = -1;
446
goto decrypt_end;
329
perror("adjustbuffer");
330
plaintext_length = -1;
331
goto decrypt_end;
447
332
}
448
333
449
334
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
454
339
break;
455
340
}
456
341
if(ret < 0){
457
perror_plus("gpgme_data_read");
342
perror("gpgme_data_read");
458
343
plaintext_length = -1;
459
344
goto decrypt_end;
460
345
}
462
347
}
463
348
464
349
if(debug){
465
fprintf_plus(stderr, "Decrypted password is: ");
350
fprintf(stderr, "Decrypted password is: ");
466
351
for(ssize_t i = 0; i < plaintext_length; i++){
467
352
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
468
353
}
479
364
return plaintext_length;
480
365
}
481
366
482
__attribute__((warn_unused_result))
483
static const char *safer_gnutls_strerror(int value){
484
const char *ret = gnutls_strerror(value);
367
static const char * safer_gnutls_strerror(int value) {
368
const char *ret = gnutls_strerror(value); /* Spurious warning from
369
-Wunreachable-code */
485
370
if(ret == NULL)
486
371
ret = "(unknown)";
487
372
return ret;
488
373
}
489
374
490
375
/* GnuTLS log function callback */
491
__attribute__((nonnull))
492
376
static void debuggnutls(__attribute__((unused)) int level,
493
377
const char* string){
494
fprintf_plus(stderr, "GnuTLS: %s", string);
378
fprintf(stderr, "GnuTLS: %s", string);
495
379
}
496
380
497
__attribute__((nonnull, warn_unused_result))
498
static int init_gnutls_global(const char *pubkeyfilename,
499
const char *seckeyfilename,
500
mandos_context *mc){
381
static int init_gnutls_global(mandos_context *mc,
382
const char *pubkeyfilename,
383
const char *seckeyfilename){
501
384
int ret;
502
385
503
386
if(debug){
504
fprintf_plus(stderr, "Initializing GnuTLS\n");
387
fprintf(stderr, "Initializing GnuTLS\n");
505
388
}
506
389
507
390
ret = gnutls_global_init();
508
if(ret != GNUTLS_E_SUCCESS){
509
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
510
safer_gnutls_strerror(ret));
391
if(ret != GNUTLS_E_SUCCESS) {
392
fprintf(stderr, "GnuTLS global_init: %s\n",
393
safer_gnutls_strerror(ret));
511
394
return -1;
512
395
}
513
396
520
403
}
521
404
522
405
/* OpenPGP credentials */
523
ret = gnutls_certificate_allocate_credentials(&mc->cred);
406
gnutls_certificate_allocate_credentials(&mc->cred);
524
407
if(ret != GNUTLS_E_SUCCESS){
525
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
526
safer_gnutls_strerror(ret));
408
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
409
* from
410
* -Wunreachable-code
411
*/
412
safer_gnutls_strerror(ret));
527
413
gnutls_global_deinit();
528
414
return -1;
529
415
}
530
416
531
417
if(debug){
532
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
533
" secret key %s as GnuTLS credentials\n",
534
pubkeyfilename,
535
seckeyfilename);
418
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
419
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
420
seckeyfilename);
536
421
}
537
422
538
423
ret = gnutls_certificate_set_openpgp_key_file
539
424
(mc->cred, pubkeyfilename, seckeyfilename,
540
425
GNUTLS_OPENPGP_FMT_BASE64);
541
if(ret != GNUTLS_E_SUCCESS){
542
fprintf_plus(stderr,
543
"Error[%d] while reading the OpenPGP key pair ('%s',"
544
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
545
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
546
safer_gnutls_strerror(ret));
426
if(ret != GNUTLS_E_SUCCESS) {
427
fprintf(stderr,
428
"Error[%d] while reading the OpenPGP key pair ('%s',"
429
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
430
fprintf(stderr, "The GnuTLS error is: %s\n",
431
safer_gnutls_strerror(ret));
547
432
goto globalfail;
548
433
}
549
434
550
435
/* GnuTLS server initialization */
551
436
ret = gnutls_dh_params_init(&mc->dh_params);
552
if(ret != GNUTLS_E_SUCCESS){
553
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
554
" initialization: %s\n",
555
safer_gnutls_strerror(ret));
437
if(ret != GNUTLS_E_SUCCESS) {
438
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
439
" %s\n", safer_gnutls_strerror(ret));
556
440
goto globalfail;
557
441
}
558
442
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
559
if(ret != GNUTLS_E_SUCCESS){
560
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
561
safer_gnutls_strerror(ret));
443
if(ret != GNUTLS_E_SUCCESS) {
444
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
445
safer_gnutls_strerror(ret));
562
446
goto globalfail;
563
447
}
564
448
574
458
return -1;
575
459
}
576
460
577
__attribute__((nonnull, warn_unused_result))
578
static int init_gnutls_session(gnutls_session_t *session,
579
mandos_context *mc){
461
static int init_gnutls_session(mandos_context *mc,
462
gnutls_session_t *session){
580
463
int ret;
581
464
/* GnuTLS session creation */
582
do {
583
ret = gnutls_init(session, GNUTLS_SERVER);
584
if(quit_now){
585
return -1;
586
}
587
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
465
ret = gnutls_init(session, GNUTLS_SERVER);
588
466
if(ret != GNUTLS_E_SUCCESS){
589
fprintf_plus(stderr,
590
"Error in GnuTLS session initialization: %s\n",
591
safer_gnutls_strerror(ret));
467
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
468
safer_gnutls_strerror(ret));
592
469
}
593
470
594
471
{
595
472
const char *err;
596
do {
597
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
598
if(quit_now){
599
gnutls_deinit(*session);
600
return -1;
601
}
602
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
603
if(ret != GNUTLS_E_SUCCESS){
604
fprintf_plus(stderr, "Syntax error at: %s\n", err);
605
fprintf_plus(stderr, "GnuTLS error: %s\n",
606
safer_gnutls_strerror(ret));
473
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
474
if(ret != GNUTLS_E_SUCCESS) {
475
fprintf(stderr, "Syntax error at: %s\n", err);
476
fprintf(stderr, "GnuTLS error: %s\n",
477
safer_gnutls_strerror(ret));
607
478
gnutls_deinit(*session);
608
479
return -1;
609
480
}
610
481
}
611
482
612
do {
613
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
614
mc->cred);
615
if(quit_now){
616
gnutls_deinit(*session);
617
return -1;
618
}
619
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
620
if(ret != GNUTLS_E_SUCCESS){
621
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
622
safer_gnutls_strerror(ret));
483
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
484
mc->cred);
485
if(ret != GNUTLS_E_SUCCESS) {
486
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
487
safer_gnutls_strerror(ret));
623
488
gnutls_deinit(*session);
624
489
return -1;
625
490
}
626
491
627
492
/* ignore client certificate if any. */
628
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
493
gnutls_certificate_server_set_request(*session,
494
GNUTLS_CERT_IGNORE);
629
495
630
496
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
631
497
637
503
__attribute__((unused)) const char *txt){}
638
504
639
505
/* Called when a Mandos server is found */
640
__attribute__((nonnull, warn_unused_result))
641
static int start_mandos_communication(const char *ip, in_port_t port,
506
static int start_mandos_communication(const char *ip, uint16_t port,
642
507
AvahiIfIndex if_index,
643
int af, mandos_context *mc){
644
int ret, tcp_sd = -1;
508
mandos_context *mc){
509
int ret, tcp_sd;
645
510
ssize_t sret;
646
struct sockaddr_storage to;
511
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
647
512
char *buffer = NULL;
648
char *decrypted_buffer = NULL;
513
char *decrypted_buffer;
649
514
size_t buffer_length = 0;
650
515
size_t buffer_capacity = 0;
516
ssize_t decrypted_buffer_size;
651
517
size_t written;
652
int retval = -1;
518
int retval = 0;
519
char interface[IF_NAMESIZE];
653
520
gnutls_session_t session;
654
int pf; /* Protocol family */
655
656
errno = 0;
657
658
if(quit_now){
659
errno = EINTR;
660
return -1;
661
}
662
663
switch(af){
664
case AF_INET6:
665
pf = PF_INET6;
666
break;
667
case AF_INET:
668
pf = PF_INET;
669
break;
670
default:
671
fprintf_plus(stderr, "Bad address family: %d\n", af);
672
errno = EINVAL;
673
return -1;
674
}
675
676
/* If the interface is specified and we have a list of interfaces */
677
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
678
/* Check if the interface is one of the interfaces we are using */
679
bool match = false;
680
{
681
char *interface = NULL;
682
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
683
interface))){
684
if(if_nametoindex(interface) == (unsigned int)if_index){
685
match = true;
686
break;
687
}
688
}
689
}
690
if(not match){
691
/* This interface does not match any in the list, so we don't
692
connect to the server */
693
if(debug){
694
char interface[IF_NAMESIZE];
695
if(if_indextoname((unsigned int)if_index, interface) == NULL){
696
perror_plus("if_indextoname");
697
} else {
698
fprintf_plus(stderr, "Skipping server on non-used interface"
699
" \"%s\"\n",
700
if_indextoname((unsigned int)if_index,
701
interface));
702
}
703
}
704
return -1;
705
}
706
}
707
708
ret = init_gnutls_session(&session, mc);
521
522
ret = init_gnutls_session(mc, &session);
709
523
if(ret != 0){
710
524
return -1;
711
525
}
712
526
713
527
if(debug){
714
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
715
PRIuMAX "\n", ip, (uintmax_t)port);
716
}
717
718
tcp_sd = socket(pf, SOCK_STREAM, 0);
719
if(tcp_sd < 0){
720
int e = errno;
721
perror_plus("socket");
722
errno = e;
723
goto mandos_end;
724
}
725
726
if(quit_now){
727
errno = EINTR;
728
goto mandos_end;
528
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
529
"\n", ip, port);
530
}
531
532
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
533
if(tcp_sd < 0) {
534
perror("socket");
535
return -1;
536
}
537
538
if(debug){
539
if(if_indextoname((unsigned int)if_index, interface) == NULL){
540
perror("if_indextoname");
541
return -1;
542
}
543
fprintf(stderr, "Binding to interface %s\n", interface);
729
544
}
730
545
731
546
memset(&to, 0, sizeof(to));
732
if(af == AF_INET6){
733
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
734
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
735
} else { /* IPv4 */
736
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
737
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
738
}
547
to.in6.sin6_family = AF_INET6;
548
/* It would be nice to have a way to detect if we were passed an
549
IPv4 address here. Now we assume an IPv6 address. */
550
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
739
551
if(ret < 0 ){
740
int e = errno;
741
perror_plus("inet_pton");
742
errno = e;
743
goto mandos_end;
552
perror("inet_pton");
553
return -1;
744
554
}
745
555
if(ret == 0){
746
int e = errno;
747
fprintf_plus(stderr, "Bad address: %s\n", ip);
748
errno = e;
749
goto mandos_end;
750
}
751
if(af == AF_INET6){
752
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
753
if(IN6_IS_ADDR_LINKLOCAL
754
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
755
if(if_index == AVAHI_IF_UNSPEC){
756
fprintf_plus(stderr, "An IPv6 link-local address is"
757
" incomplete without a network interface\n");
758
errno = EINVAL;
759
goto mandos_end;
760
}
761
/* Set the network interface number as scope */
762
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
763
}
764
} else {
765
((struct sockaddr_in *)&to)->sin_port = htons(port);
766
}
556
fprintf(stderr, "Bad address: %s\n", ip);
557
return -1;
558
}
559
to.in6.sin6_port = htons(port); /* Spurious warnings from
560
-Wconversion and
561
-Wunreachable-code */
767
562
768
if(quit_now){
769
errno = EINTR;
770
goto mandos_end;
771
}
563
to.in6.sin6_scope_id = (uint32_t)if_index;
772
564
773
565
if(debug){
774
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
775
char interface[IF_NAMESIZE];
776
if(if_indextoname((unsigned int)if_index, interface) == NULL){
777
perror_plus("if_indextoname");
778
} else {
779
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
780
"\n", ip, interface, (uintmax_t)port);
566
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
567
port);
568
char addrstr[INET6_ADDRSTRLEN] = "";
569
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
570
sizeof(addrstr)) == NULL){
571
perror("inet_ntop");
572
} else {
573
if(strcmp(addrstr, ip) != 0){
574
fprintf(stderr, "Canonical address form: %s\n", addrstr);
781
575
}
782
} else {
783
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
784
ip, (uintmax_t)port);
785
}
786
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
787
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
788
if(af == AF_INET6){
789
ret = getnameinfo((struct sockaddr *)&to,
790
sizeof(struct sockaddr_in6),
791
addrstr, sizeof(addrstr), NULL, 0,
792
NI_NUMERICHOST);
793
} else {
794
ret = getnameinfo((struct sockaddr *)&to,
795
sizeof(struct sockaddr_in),
796
addrstr, sizeof(addrstr), NULL, 0,
797
NI_NUMERICHOST);
798
}
799
if(ret == EAI_SYSTEM){
800
perror_plus("getnameinfo");
801
} else if(ret != 0) {
802
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
803
} else if(strcmp(addrstr, ip) != 0){
804
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
805
}
806
}
807
808
if(quit_now){
809
errno = EINTR;
810
goto mandos_end;
811
}
812
813
if(af == AF_INET6){
814
ret = connect(tcp_sd, (struct sockaddr *)&to,
815
sizeof(struct sockaddr_in6));
816
} else {
817
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
818
sizeof(struct sockaddr_in));
819
}
576
}
577
}
578
579
ret = connect(tcp_sd, &to.in, sizeof(to));
820
580
if(ret < 0){
821
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
822
int e = errno;
823
perror_plus("connect");
824
errno = e;
825
}
826
goto mandos_end;
827
}
828
829
if(quit_now){
830
errno = EINTR;
831
goto mandos_end;
581
perror("connect");
582
return -1;
832
583
}
833
584
834
585
const char *out = mandos_protocol_version;
836
587
while(true){
837
588
size_t out_size = strlen(out);
838
589
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
839
out_size - written));
590
out_size - written));
840
591
if(ret == -1){
841
int e = errno;
842
perror_plus("write");
843
errno = e;
592
perror("write");
593
retval = -1;
844
594
goto mandos_end;
845
595
}
846
596
written += (size_t)ret;
854
604
break;
855
605
}
856
606
}
857
858
if(quit_now){
859
errno = EINTR;
860
goto mandos_end;
861
}
862
607
}
863
608
864
609
if(debug){
865
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
866
}
867
868
if(quit_now){
869
errno = EINTR;
870
goto mandos_end;
871
}
872
873
/* This casting via intptr_t is to eliminate warning about casting
874
an int to a pointer type. This is exactly how the GnuTLS Guile
875
function "set-session-transport-fd!" does it. */
876
gnutls_transport_set_ptr(session,
877
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
878
879
if(quit_now){
880
errno = EINTR;
881
goto mandos_end;
882
}
883
884
do {
610
fprintf(stderr, "Establishing TLS session with %s\n", ip);
611
}
612
613
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
614
615
do{
885
616
ret = gnutls_handshake(session);
886
if(quit_now){
887
errno = EINTR;
888
goto mandos_end;
889
}
890
617
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
891
618
892
619
if(ret != GNUTLS_E_SUCCESS){
893
620
if(debug){
894
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
621
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
895
622
gnutls_perror(ret);
896
623
}
897
errno = EPROTO;
624
retval = -1;
898
625
goto mandos_end;
899
626
}
900
627
901
628
/* Read OpenPGP packet that contains the wanted password */
902
629
903
630
if(debug){
904
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
905
" %s\n", ip);
631
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
632
ip);
906
633
}
907
634
908
635
while(true){
909
910
if(quit_now){
911
errno = EINTR;
912
goto mandos_end;
913
}
914
915
buffer_capacity = incbuffer(&buffer, buffer_length,
916
buffer_capacity);
636
buffer_capacity = adjustbuffer(&buffer, buffer_length,
637
buffer_capacity);
917
638
if(buffer_capacity == 0){
918
int e = errno;
919
perror_plus("incbuffer");
920
errno = e;
921
goto mandos_end;
922
}
923
924
if(quit_now){
925
errno = EINTR;
639
perror("adjustbuffer");
640
retval = -1;
926
641
goto mandos_end;
927
642
}
928
643
937
652
case GNUTLS_E_AGAIN:
938
653
break;
939
654
case GNUTLS_E_REHANDSHAKE:
940
do {
655
do{
941
656
ret = gnutls_handshake(session);
942
943
if(quit_now){
944
errno = EINTR;
945
goto mandos_end;
946
}
947
657
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
948
658
if(ret < 0){
949
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
950
"***\n");
659
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
951
660
gnutls_perror(ret);
952
errno = EPROTO;
661
retval = -1;
953
662
goto mandos_end;
954
663
}
955
664
break;
956
665
default:
957
fprintf_plus(stderr, "Unknown error while reading data from"
958
" encrypted session with Mandos server\n");
666
fprintf(stderr, "Unknown error while reading data from"
667
" encrypted session with Mandos server\n");
668
retval = -1;
959
669
gnutls_bye(session, GNUTLS_SHUT_RDWR);
960
errno = EIO;
961
670
goto mandos_end;
962
671
}
963
672
} else {
966
675
}
967
676
968
677
if(debug){
969
fprintf_plus(stderr, "Closing TLS session\n");
970
}
971
972
if(quit_now){
973
errno = EINTR;
974
goto mandos_end;
975
}
976
977
do {
978
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
979
if(quit_now){
980
errno = EINTR;
981
goto mandos_end;
982
}
983
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
678
fprintf(stderr, "Closing TLS session\n");
679
}
680
681
gnutls_bye(session, GNUTLS_SHUT_RDWR);
984
682
985
683
if(buffer_length > 0){
986
ssize_t decrypted_buffer_size;
987
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
988
&decrypted_buffer, mc);
684
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
685
buffer_length,
686
&decrypted_buffer);
989
687
if(decrypted_buffer_size >= 0){
990
991
688
written = 0;
992
689
while(written < (size_t) decrypted_buffer_size){
993
if(quit_now){
994
errno = EINTR;
995
goto mandos_end;
996
}
997
998
690
ret = (int)fwrite(decrypted_buffer + written, 1,
999
691
(size_t)decrypted_buffer_size - written,
1000
692
stdout);
1001
693
if(ret == 0 and ferror(stdout)){
1002
int e = errno;
1003
694
if(debug){
1004
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1005
strerror(errno));
695
fprintf(stderr, "Error writing encrypted data: %s\n",
696
strerror(errno));
1006
697
}
1007
errno = e;
1008
goto mandos_end;
698
retval = -1;
699
break;
1009
700
}
1010
701
written += (size_t)ret;
1011
702
}
1012
retval = 0;
703
free(decrypted_buffer);
704
} else {
705
retval = -1;
1013
706
}
707
} else {
708
retval = -1;
1014
709
}
1015
710
1016
711
/* Shutdown procedure */
1017
712
1018
713
mandos_end:
1019
{
1020
int e = errno;
1021
free(decrypted_buffer);
1022
free(buffer);
1023
if(tcp_sd >= 0){
1024
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1025
}
1026
if(ret == -1){
1027
if(e == 0){
1028
e = errno;
1029
}
1030
perror_plus("close");
1031
}
1032
gnutls_deinit(session);
1033
errno = e;
1034
if(quit_now){
1035
errno = EINTR;
1036
retval = -1;
1037
}
714
free(buffer);
715
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
716
if(ret == -1){
717
perror("close");
1038
718
}
719
gnutls_deinit(session);
1039
720
return retval;
1040
721
}
1041
722
1042
__attribute__((nonnull))
1043
723
static void resolve_callback(AvahiSServiceResolver *r,
1044
724
AvahiIfIndex interface,
1045
AvahiProtocol proto,
725
AVAHI_GCC_UNUSED AvahiProtocol protocol,
1046
726
AvahiResolverEvent event,
1047
727
const char *name,
1048
728
const char *type,
1053
733
AVAHI_GCC_UNUSED AvahiStringList *txt,
1054
734
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1055
735
flags,
1056
void *mc){
1057
if(r == NULL){
1058
return;
1059
}
736
void* userdata) {
737
mandos_context *mc = userdata;
738
assert(r);
1060
739
1061
740
/* Called whenever a service has been resolved successfully or
1062
741
timed out */
1063
742
1064
if(quit_now){
1065
return;
1066
}
1067
1068
switch(event){
743
switch(event) {
1069
744
default:
1070
745
case AVAHI_RESOLVER_FAILURE:
1071
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1072
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1073
domain,
1074
avahi_strerror(avahi_server_errno
1075
(((mandos_context*)mc)->server)));
746
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
747
" of type '%s' in domain '%s': %s\n", name, type, domain,
748
avahi_strerror(avahi_server_errno(mc->server)));
1076
749
break;
1077
750
1078
751
case AVAHI_RESOLVER_FOUND:
1080
753
char ip[AVAHI_ADDRESS_STR_MAX];
1081
754
avahi_address_snprint(ip, sizeof(ip), address);
1082
755
if(debug){
1083
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1084
PRIdMAX ") on port %" PRIu16 "\n", name,
1085
host_name, ip, (intmax_t)interface, port);
756
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
757
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
758
ip, (intmax_t)interface, port);
1086
759
}
1087
int ret = start_mandos_communication(ip, (in_port_t)port,
1088
interface,
1089
avahi_proto_to_af(proto),
1090
mc);
760
int ret = start_mandos_communication(ip, port, interface, mc);
1091
761
if(ret == 0){
1092
avahi_simple_poll_quit(simple_poll);
1093
} else {
1094
if(not add_server(ip, (in_port_t)port, interface,
1095
avahi_proto_to_af(proto),
1096
&((mandos_context*)mc)->current_server)){
1097
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1098
" list\n", name);
1099
}
762
avahi_simple_poll_quit(mc->simple_poll);
1100
763
}
1101
764
}
1102
765
}
1103
766
avahi_s_service_resolver_free(r);
1104
767
}
1105
768
1106
static void browse_callback(AvahiSServiceBrowser *b,
1107
AvahiIfIndex interface,
1108
AvahiProtocol protocol,
1109
AvahiBrowserEvent event,
1110
const char *name,
1111
const char *type,
1112
const char *domain,
1113
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1114
flags,
1115
void *mc){
1116
if(b == NULL){
1117
return;
1118
}
769
static void browse_callback( AvahiSServiceBrowser *b,
770
AvahiIfIndex interface,
771
AvahiProtocol protocol,
772
AvahiBrowserEvent event,
773
const char *name,
774
const char *type,
775
const char *domain,
776
AVAHI_GCC_UNUSED AvahiLookupResultFlags
777
flags,
778
void* userdata) {
779
mandos_context *mc = userdata;
780
assert(b);
1119
781
1120
782
/* Called whenever a new services becomes available on the LAN or
1121
783
is removed from the LAN */
1122
784
1123
if(quit_now){
1124
return;
1125
}
1126
1127
switch(event){
785
switch(event) {
1128
786
default:
1129
787
case AVAHI_BROWSER_FAILURE:
1130
788
1131
fprintf_plus(stderr, "(Avahi browser) %s\n",
1132
avahi_strerror(avahi_server_errno
1133
(((mandos_context*)mc)->server)));
1134
avahi_simple_poll_quit(simple_poll);
789
fprintf(stderr, "(Avahi browser) %s\n",
790
avahi_strerror(avahi_server_errno(mc->server)));
791
avahi_simple_poll_quit(mc->simple_poll);
1135
792
return;
1136
793
1137
794
case AVAHI_BROWSER_NEW:
1140
797
the callback function is called the Avahi server will free the
1141
798
resolver for us. */
1142
799
1143
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1144
interface, protocol, name, type,
1145
domain, protocol, 0,
1146
resolve_callback, mc) == NULL)
1147
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1148
" %s\n", name,
1149
avahi_strerror(avahi_server_errno
1150
(((mandos_context*)mc)->server)));
800
if(!(avahi_s_service_resolver_new(mc->server, interface,
801
protocol, name, type, domain,
802
AVAHI_PROTO_INET6, 0,
803
resolve_callback, mc)))
804
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
805
name, avahi_strerror(avahi_server_errno(mc->server)));
1151
806
break;
1152
807
1153
808
case AVAHI_BROWSER_REMOVE:
1156
811
case AVAHI_BROWSER_ALL_FOR_NOW:
1157
812
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1158
813
if(debug){
1159
fprintf_plus(stderr, "No Mandos server found, still"
1160
" searching...\n");
814
fprintf(stderr, "No Mandos server found, still searching...\n");
1161
815
}
1162
816
break;
1163
817
}
1164
818
}
1165
819
1166
/* Signal handler that stops main loop after SIGTERM */
1167
static void handle_sigterm(int sig){
1168
if(quit_now){
1169
return;
1170
}
1171
quit_now = 1;
1172
signal_received = sig;
1173
int old_errno = errno;
1174
/* set main loop to exit */
1175
if(simple_poll != NULL){
1176
avahi_simple_poll_quit(simple_poll);
1177
}
1178
errno = old_errno;
1179
}
1180
1181
__attribute__((nonnull, warn_unused_result))
1182
bool get_flags(const char *ifname, struct ifreq *ifr){
1183
int ret;
1184
error_t ret_errno;
1185
1186
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1187
if(s < 0){
1188
ret_errno = errno;
1189
perror_plus("socket");
1190
errno = ret_errno;
1191
return false;
1192
}
1193
strcpy(ifr->ifr_name, ifname);
1194
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1195
if(ret == -1){
1196
if(debug){
1197
ret_errno = errno;
1198
perror_plus("ioctl SIOCGIFFLAGS");
1199
errno = ret_errno;
1200
}
1201
return false;
1202
}
1203
return true;
1204
}
1205
1206
__attribute__((nonnull, warn_unused_result))
1207
bool good_flags(const char *ifname, const struct ifreq *ifr){
1208
1209
/* Reject the loopback device */
1210
if(ifr->ifr_flags & IFF_LOOPBACK){
1211
if(debug){
1212
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1213
ifname);
1214
}
1215
return false;
1216
}
1217
/* Accept point-to-point devices only if connect_to is specified */
1218
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1219
if(debug){
1220
fprintf_plus(stderr, "Accepting point-to-point interface"
1221
" \"%s\"\n", ifname);
1222
}
1223
return true;
1224
}
1225
/* Otherwise, reject non-broadcast-capable devices */
1226
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1227
if(debug){
1228
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1229
" \"%s\"\n", ifname);
1230
}
1231
return false;
1232
}
1233
/* Reject non-ARP interfaces (including dummy interfaces) */
1234
if(ifr->ifr_flags & IFF_NOARP){
1235
if(debug){
1236
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1237
ifname);
1238
}
1239
return false;
1240
}
1241
1242
/* Accept this device */
1243
if(debug){
1244
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1245
}
1246
return true;
1247
}
1248
1249
/*
1250
* This function determines if a directory entry in /sys/class/net
1251
* corresponds to an acceptable network device.
1252
* (This function is passed to scandir(3) as a filter function.)
1253
*/
1254
__attribute__((nonnull, warn_unused_result))
1255
int good_interface(const struct dirent *if_entry){
1256
if(if_entry->d_name[0] == '.'){
1257
return 0;
1258
}
1259
1260
struct ifreq ifr;
1261
if(not get_flags(if_entry->d_name, &ifr)){
1262
if(debug){
1263
fprintf_plus(stderr, "Failed to get flags for interface "
1264
"\"%s\"\n", if_entry->d_name);
1265
}
1266
return 0;
1267
}
1268
1269
if(not good_flags(if_entry->d_name, &ifr)){
1270
return 0;
1271
}
1272
return 1;
1273
}
1274
1275
/*
1276
* This function determines if a network interface is up.
1277
*/
1278
__attribute__((nonnull, warn_unused_result))
1279
bool interface_is_up(const char *interface){
1280
struct ifreq ifr;
1281
if(not get_flags(interface, &ifr)){
1282
if(debug){
1283
fprintf_plus(stderr, "Failed to get flags for interface "
1284
"\"%s\"\n", interface);
1285
}
1286
return false;
1287
}
1288
1289
return (bool)(ifr.ifr_flags & IFF_UP);
1290
}
1291
1292
/*
1293
* This function determines if a network interface is running
1294
*/
1295
__attribute__((nonnull, warn_unused_result))
1296
bool interface_is_running(const char *interface){
1297
struct ifreq ifr;
1298
if(not get_flags(interface, &ifr)){
1299
if(debug){
1300
fprintf_plus(stderr, "Failed to get flags for interface "
1301
"\"%s\"\n", interface);
1302
}
1303
return false;
1304
}
1305
1306
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1307
}
1308
1309
__attribute__((nonnull, pure, warn_unused_result))
1310
int notdotentries(const struct dirent *direntry){
1311
/* Skip "." and ".." */
1312
if(direntry->d_name[0] == '.'
1313
and (direntry->d_name[1] == '\0'
1314
or (direntry->d_name[1] == '.'
1315
and direntry->d_name[2] == '\0'))){
1316
return 0;
1317
}
1318
return 1;
1319
}
1320
1321
/* Is this directory entry a runnable program? */
1322
__attribute__((nonnull, warn_unused_result))
1323
int runnable_hook(const struct dirent *direntry){
1324
int ret;
1325
size_t sret;
1326
struct stat st;
1327
1328
if((direntry->d_name)[0] == '\0'){
1329
/* Empty name? */
1330
return 0;
1331
}
1332
1333
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1334
"abcdefghijklmnopqrstuvwxyz"
1335
"0123456789"
1336
"_-");
1337
if((direntry->d_name)[sret] != '\0'){
1338
/* Contains non-allowed characters */
1339
if(debug){
1340
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1341
direntry->d_name);
1342
}
1343
return 0;
1344
}
1345
1346
char *fullname = NULL;
1347
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1348
if(ret < 0){
1349
perror_plus("asprintf");
1350
return 0;
1351
}
1352
1353
ret = stat(fullname, &st);
1354
if(ret == -1){
1355
if(debug){
1356
perror_plus("Could not stat hook");
1357
}
1358
return 0;
1359
}
1360
if(not (S_ISREG(st.st_mode))){
1361
/* Not a regular file */
1362
if(debug){
1363
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1364
direntry->d_name);
1365
}
1366
return 0;
1367
}
1368
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1369
/* Not executable */
1370
if(debug){
1371
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1372
direntry->d_name);
1373
}
1374
return 0;
1375
}
1376
if(debug){
1377
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1378
direntry->d_name);
1379
}
1380
return 1;
1381
}
1382
1383
__attribute__((nonnull, warn_unused_result))
1384
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1385
mandos_context *mc){
1386
int ret;
1387
struct timespec now;
1388
struct timespec waited_time;
1389
intmax_t block_time;
1390
1391
while(true){
1392
if(mc->current_server == NULL){
1393
if(debug){
1394
fprintf_plus(stderr, "Wait until first server is found."
1395
" No timeout!\n");
1396
}
1397
ret = avahi_simple_poll_iterate(s, -1);
1398
} else {
1399
if(debug){
1400
fprintf_plus(stderr, "Check current_server if we should run"
1401
" it, or wait\n");
1402
}
1403
/* the current time */
1404
ret = clock_gettime(CLOCK_MONOTONIC, &now);
820
int main(int argc, char *argv[]){
821
AvahiSServiceBrowser *sb = NULL;
822
int error;
823
int ret;
824
intmax_t tmpmax;
825
int numchars;
826
int exitcode = EXIT_SUCCESS;
827
const char *interface = "eth0";
828
struct ifreq network;
829
int sd;
830
uid_t uid;
831
gid_t gid;
832
char *connect_to = NULL;
833
char tempdir[] = "/tmp/mandosXXXXXX";
834
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
835
const char *seckey = PATHDIR "/" SECKEY;
836
const char *pubkey = PATHDIR "/" PUBKEY;
837
838
mandos_context mc = { .simple_poll = NULL, .server = NULL,
839
.dh_bits = 1024, .priority = "SECURE256"
840
":!CTYPE-X.509:+CTYPE-OPENPGP" };
841
bool gnutls_initalized = false;
842
bool gpgme_initalized = false;
843
844
{
845
struct argp_option options[] = {
846
{ .name = "debug", .key = 128,
847
.doc = "Debug mode", .group = 3 },
848
{ .name = "connect", .key = 'c',
849
.arg = "ADDRESS:PORT",
850
.doc = "Connect directly to a specific Mandos server",
851
.group = 1 },
852
{ .name = "interface", .key = 'i',
853
.arg = "NAME",
854
.doc = "Interface that will be used to search for Mandos"
855
" servers",
856
.group = 1 },
857
{ .name = "seckey", .key = 's',
858
.arg = "FILE",
859
.doc = "OpenPGP secret key file base name",
860
.group = 1 },
861
{ .name = "pubkey", .key = 'p',
862
.arg = "FILE",
863
.doc = "OpenPGP public key file base name",
864
.group = 2 },
865
{ .name = "dh-bits", .key = 129,
866
.arg = "BITS",
867
.doc = "Bit length of the prime number used in the"
868
" Diffie-Hellman key exchange",
869
.group = 2 },
870
{ .name = "priority", .key = 130,
871
.arg = "STRING",
872
.doc = "GnuTLS priority string for the TLS handshake",
873
.group = 1 },
874
{ .name = NULL }
875
};
876
877
error_t parse_opt(int key, char *arg,
878
struct argp_state *state) {
879
switch(key) {
880
case 128: /* --debug */
881
debug = true;
882
break;
883
case 'c': /* --connect */
884
connect_to = arg;
885
break;
886
case 'i': /* --interface */
887
interface = arg;
888
break;
889
case 's': /* --seckey */
890
seckey = arg;
891
break;
892
case 'p': /* --pubkey */
893
pubkey = arg;
894
break;
895
case 129: /* --dh-bits */
896
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
897
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
898
or arg[numchars] != '\0'){
899
fprintf(stderr, "Bad number of DH bits\n");
900
exit(EXIT_FAILURE);
901
}
902
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
903
break;
904
case 130: /* --priority */
905
mc.priority = arg;
906
break;
907
case ARGP_KEY_ARG:
908
argp_usage(state);
909
case ARGP_KEY_END:
910
break;
911
default:
912
return ARGP_ERR_UNKNOWN;
913
}
914
return 0;
915
}
916
917
struct argp argp = { .options = options, .parser = parse_opt,
918
.args_doc = "",
919
.doc = "Mandos client -- Get and decrypt"
920
" passwords from a Mandos server" };
921
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
922
if(ret == ARGP_ERR_UNKNOWN){
923
fprintf(stderr, "Unknown error while parsing arguments\n");
924
exitcode = EXIT_FAILURE;
925
goto end;
926
}
927
}
928
929
/* If the interface is down, bring it up */
930
{
931
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
932
if(sd < 0) {
933
perror("socket");
934
exitcode = EXIT_FAILURE;
935
goto end;
936
}
937
strcpy(network.ifr_name, interface);
938
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1405
939
if(ret == -1){
1406
perror_plus("clock_gettime");
1407
return -1;
1408
}
1409
/* Calculating in ms how long time between now and server
1410
who we visted longest time ago. Now - last seen. */
1411
waited_time.tv_sec = (now.tv_sec
1412
- mc->current_server->last_seen.tv_sec);
1413
waited_time.tv_nsec = (now.tv_nsec
1414
- mc->current_server->last_seen.tv_nsec);
1415
/* total time is 10s/10,000ms.
1416
Converting to s from ms by dividing by 1,000,
1417
and ns to ms by dividing by 1,000,000. */
1418
block_time = ((retry_interval
1419
- ((intmax_t)waited_time.tv_sec * 1000))
1420
- ((intmax_t)waited_time.tv_nsec / 1000000));
1421
1422
if(debug){
1423
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1424
block_time);
1425
}
1426
1427
if(block_time <= 0){
1428
ret = start_mandos_communication(mc->current_server->ip,
1429
mc->current_server->port,
1430
mc->current_server->if_index,
1431
mc->current_server->af, mc);
1432
if(ret == 0){
1433
avahi_simple_poll_quit(s);
1434
return 0;
1435
}
1436
ret = clock_gettime(CLOCK_MONOTONIC,
1437
&mc->current_server->last_seen);
940
perror("ioctl SIOCGIFFLAGS");
941
exitcode = EXIT_FAILURE;
942
goto end;
943
}
944
if((network.ifr_flags & IFF_UP) == 0){
945
network.ifr_flags |= IFF_UP;
946
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1438
947
if(ret == -1){
1439
perror_plus("clock_gettime");
1440
return -1;
948
perror("ioctl SIOCSIFFLAGS");
949
exitcode = EXIT_FAILURE;
950
goto end;
1441
951
}
1442
mc->current_server = mc->current_server->next;
1443
block_time = 0; /* Call avahi to find new Mandos
1444
servers, but don't block */
1445
}
1446
1447
ret = avahi_simple_poll_iterate(s, (int)block_time);
1448
}
1449
if(ret != 0){
1450
if(ret > 0 or errno != EINTR){
1451
return (ret != 1) ? ret : 0;
1452
}
1453
}
1454
}
1455
}
1456
1457
/* Set effective uid to 0, return errno */
1458
__attribute__((warn_unused_result))
1459
error_t raise_privileges(void){
1460
error_t old_errno = errno;
1461
error_t ret_errno = 0;
1462
if(seteuid(0) == -1){
1463
ret_errno = errno;
1464
perror_plus("seteuid");
1465
}
1466
errno = old_errno;
1467
return ret_errno;
1468
}
1469
1470
/* Set effective and real user ID to 0. Return errno. */
1471
__attribute__((warn_unused_result))
1472
error_t raise_privileges_permanently(void){
1473
error_t old_errno = errno;
1474
error_t ret_errno = raise_privileges();
1475
if(ret_errno != 0){
1476
errno = old_errno;
1477
return ret_errno;
1478
}
1479
if(setuid(0) == -1){
1480
ret_errno = errno;
1481
perror_plus("seteuid");
1482
}
1483
errno = old_errno;
1484
return ret_errno;
1485
}
1486
1487
/* Set effective user ID to unprivileged saved user ID */
1488
__attribute__((warn_unused_result))
1489
error_t lower_privileges(void){
1490
error_t old_errno = errno;
1491
error_t ret_errno = 0;
1492
if(seteuid(uid) == -1){
1493
ret_errno = errno;
1494
perror_plus("seteuid");
1495
}
1496
errno = old_errno;
1497
return ret_errno;
1498
}
1499
1500
/* Lower privileges permanently */
1501
__attribute__((warn_unused_result))
1502
error_t lower_privileges_permanently(void){
1503
error_t old_errno = errno;
1504
error_t ret_errno = 0;
1505
if(setuid(uid) == -1){
1506
ret_errno = errno;
1507
perror_plus("setuid");
1508
}
1509
errno = old_errno;
1510
return ret_errno;
1511
}
1512
1513
__attribute__((nonnull))
1514
void run_network_hooks(const char *mode, const char *interface,
1515
const float delay){
1516
struct dirent **direntries;
1517
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1518
alphasort);
1519
if(numhooks == -1){
1520
if(errno == ENOENT){
1521
if(debug){
1522
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1523
" found\n", hookdir);
1524
}
1525
} else {
1526
perror_plus("scandir");
1527
}
1528
} else {
1529
struct dirent *direntry;
1530
int ret;
1531
int devnull = open("/dev/null", O_RDONLY);
1532
for(int i = 0; i < numhooks; i++){
1533
direntry = direntries[i];
1534
char *fullname = NULL;
1535
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
952
}
953
ret = (int)TEMP_FAILURE_RETRY(close(sd));
954
if(ret == -1){
955
perror("close");
956
}
957
}
958
959
uid = getuid();
960
gid = getgid();
961
962
ret = setuid(uid);
963
if(ret == -1){
964
perror("setuid");
965
}
966
967
setgid(gid);
968
if(ret == -1){
969
perror("setgid");
970
}
971
972
ret = init_gnutls_global(&mc, pubkey, seckey);
973
if(ret == -1){
974
fprintf(stderr, "init_gnutls_global failed\n");
975
exitcode = EXIT_FAILURE;
976
goto end;
977
} else {
978
gnutls_initalized = true;
979
}
980
981
if(mkdtemp(tempdir) == NULL){
982
perror("mkdtemp");
983
tempdir[0] = '\0';
984
goto end;
985
}
986
987
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
988
fprintf(stderr, "gpgme_initalized failed\n");
989
exitcode = EXIT_FAILURE;
990
goto end;
991
} else {
992
gpgme_initalized = true;
993
}
994
995
if_index = (AvahiIfIndex) if_nametoindex(interface);
996
if(if_index == 0){
997
fprintf(stderr, "No such interface: \"%s\"\n", interface);
998
exit(EXIT_FAILURE);
999
}
1000
1001
if(connect_to != NULL){
1002
/* Connect directly, do not use Zeroconf */
1003
/* (Mainly meant for debugging) */
1004
char *address = strrchr(connect_to, ':');
1005
if(address == NULL){
1006
fprintf(stderr, "No colon in address\n");
1007
exitcode = EXIT_FAILURE;
1008
goto end;
1009
}
1010
uint16_t port;
1011
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1012
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1013
or address[numchars+1] != '\0'){
1014
fprintf(stderr, "Bad port number\n");
1015
exitcode = EXIT_FAILURE;
1016
goto end;
1017
}
1018
port = (uint16_t)tmpmax;
1019
*address = '\0';
1020
address = connect_to;
1021
ret = start_mandos_communication(address, port, if_index, &mc);
1536
1022
if(ret < 0){
1537
perror_plus("asprintf");
1538
continue;
1539
}
1540
if(debug){
1541
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1542
direntry->d_name);
1543
}
1544
pid_t hook_pid = fork();
1545
if(hook_pid == 0){
1546
/* Child */
1547
/* Raise privileges */
1548
if(raise_privileges_permanently() != 0){
1549
perror_plus("Failed to raise privileges");
1550
_exit(EX_NOPERM);
1551
}
1552
/* Set group */
1553
errno = 0;
1554
ret = setgid(0);
1555
if(ret == -1){
1556
perror_plus("setgid");
1557
_exit(EX_NOPERM);
1558
}
1559
/* Reset supplementary groups */
1560
errno = 0;
1561
ret = setgroups(0, NULL);
1562
if(ret == -1){
1563
perror_plus("setgroups");
1564
_exit(EX_NOPERM);
1565
}
1566
ret = dup2(devnull, STDIN_FILENO);
1567
if(ret == -1){
1568
perror_plus("dup2(devnull, STDIN_FILENO)");
1569
_exit(EX_OSERR);
1570
}
1571
ret = close(devnull);
1572
if(ret == -1){
1573
perror_plus("close");
1574
_exit(EX_OSERR);
1575
}
1576
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1577
if(ret == -1){
1578
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1579
_exit(EX_OSERR);
1580
}
1581
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1582
if(ret == -1){
1583
perror_plus("setenv");
1584
_exit(EX_OSERR);
1585
}
1586
ret = setenv("DEVICE", interface, 1);
1587
if(ret == -1){
1588
perror_plus("setenv");
1589
_exit(EX_OSERR);
1590
}
1591
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1592
if(ret == -1){
1593
perror_plus("setenv");
1594
_exit(EX_OSERR);
1595
}
1596
ret = setenv("MODE", mode, 1);
1597
if(ret == -1){
1598
perror_plus("setenv");
1599
_exit(EX_OSERR);
1600
}
1601
char *delaystring;
1602
ret = asprintf(&delaystring, "%f", (double)delay);
1603
if(ret == -1){
1604
perror_plus("asprintf");
1605
_exit(EX_OSERR);
1606
}
1607
ret = setenv("DELAY", delaystring, 1);
1608
if(ret == -1){
1609
free(delaystring);
1610
perror_plus("setenv");
1611
_exit(EX_OSERR);
1612
}
1613
free(delaystring);
1614
if(connect_to != NULL){
1615
ret = setenv("CONNECT", connect_to, 1);
1616
if(ret == -1){
1617
perror_plus("setenv");
1618
_exit(EX_OSERR);
1023
exitcode = EXIT_FAILURE;
1024
} else {
1025
exitcode = EXIT_SUCCESS;
1026
}
1027
goto end;
1028
}
1029
1030
if(not debug){
1031
avahi_set_log_function(empty_log);
1032
}
1033
1034
/* Initialize the pseudo-RNG for Avahi */
1035
srand((unsigned int) time(NULL));
1036
1037
/* Allocate main Avahi loop object */
1038
mc.simple_poll = avahi_simple_poll_new();
1039
if(mc.simple_poll == NULL) {
1040
fprintf(stderr, "Avahi: Failed to create simple poll"
1041
" object.\n");
1042
exitcode = EXIT_FAILURE;
1043
goto end;
1044
}
1045
1046
{
1047
AvahiServerConfig config;
1048
/* Do not publish any local Zeroconf records */
1049
avahi_server_config_init(&config);
1050
config.publish_hinfo = 0;
1051
config.publish_addresses = 0;
1052
config.publish_workstation = 0;
1053
config.publish_domain = 0;
1054
1055
/* Allocate a new server */
1056
mc.server = avahi_server_new(avahi_simple_poll_get
1057
(mc.simple_poll), &config, NULL,
1058
NULL, &error);
1059
1060
/* Free the Avahi configuration data */
1061
avahi_server_config_free(&config);
1062
}
1063
1064
/* Check if creating the Avahi server object succeeded */
1065
if(mc.server == NULL) {
1066
fprintf(stderr, "Failed to create Avahi server: %s\n",
1067
avahi_strerror(error));
1068
exitcode = EXIT_FAILURE;
1069
goto end;
1070
}
1071
1072
/* Create the Avahi service browser */
1073
sb = avahi_s_service_browser_new(mc.server, if_index,
1074
AVAHI_PROTO_INET6,
1075
"_mandos._tcp", NULL, 0,
1076
browse_callback, &mc);
1077
if(sb == NULL) {
1078
fprintf(stderr, "Failed to create service browser: %s\n",
1079
avahi_strerror(avahi_server_errno(mc.server)));
1080
exitcode = EXIT_FAILURE;
1081
goto end;
1082
}
1083
1084
/* Run the main loop */
1085
1086
if(debug){
1087
fprintf(stderr, "Starting Avahi loop search\n");
1088
}
1089
1090
avahi_simple_poll_loop(mc.simple_poll);
1091
1092
end:
1093
1094
if(debug){
1095
fprintf(stderr, "%s exiting\n", argv[0]);
1096
}
1097
1098
/* Cleanup things */
1099
if(sb != NULL)
1100
avahi_s_service_browser_free(sb);
1101
1102
if(mc.server != NULL)
1103
avahi_server_free(mc.server);
1104
1105
if(mc.simple_poll != NULL)
1106
avahi_simple_poll_free(mc.simple_poll);
1107
1108
if(gnutls_initalized){
1109
gnutls_certificate_free_credentials(mc.cred);
1110
gnutls_global_deinit();
1111
gnutls_dh_params_deinit(mc.dh_params);
1112
}
1113
1114
if(gpgme_initalized){
1115
gpgme_release(mc.ctx);
1116
}
1117
1118
/* Removes the temp directory used by GPGME */
1119
if(tempdir[0] != '\0'){
1120
DIR *d;
1121
struct dirent *direntry;
1122
d = opendir(tempdir);
1123
if(d == NULL){
1124
if(errno != ENOENT){
1125
perror("opendir");
1126
}
1127
} else {
1128
while(true){
1129
direntry = readdir(d);
1130
if(direntry == NULL){
1131
break;
1619
1132
}
1620
}
1621
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1622
perror_plus("execl");
1623
_exit(EXIT_FAILURE);
1624
}
1625
} else {
1626
int status;
1627
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1628
perror_plus("waitpid");
1629
free(fullname);
1630
continue;
1631
}
1632
if(WIFEXITED(status)){
1633
if(WEXITSTATUS(status) != 0){
1634
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1635
" with status %d\n", direntry->d_name,
1636
WEXITSTATUS(status));
1133
if(direntry->d_type == DT_REG){
1134
char *fullname = NULL;
1135
ret = asprintf(&fullname, "%s/%s", tempdir,
1136
direntry->d_name);
1137
if(ret < 0){
1138
perror("asprintf");
1139
continue;
1140
}
1141
ret = unlink(fullname);
1142
if(ret == -1){
1143
fprintf(stderr, "unlink(\"%s\"): %s",
1144
fullname, strerror(errno));
1145
}
1637
1146
free(fullname);
1638
continue;
1639
}
1640
} else if(WIFSIGNALED(status)){
1641
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1642
" signal %d\n", direntry->d_name,
1643
WTERMSIG(status));
1644
free(fullname);
1645
continue;
1646
} else {
1647
fprintf_plus(stderr, "Warning: network hook \"%s\""
1648
" crashed\n", direntry->d_name);
1649
free(fullname);
1650
continue;
1651
}
1652
}
1653
free(fullname);
1654
if(debug){
1655
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1656
direntry->d_name);
1657
}
1658
}
1659
close(devnull);
1660
}
1661
}
1662
1663
__attribute__((nonnull, warn_unused_result))
1664
error_t bring_up_interface(const char *const interface,
1665
const float delay){
1666
error_t old_errno = errno;
1667
int ret;
1668
struct ifreq network;
1669
unsigned int if_index = if_nametoindex(interface);
1670
if(if_index == 0){
1671
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1672
errno = old_errno;
1673
return ENXIO;
1674
}
1675
1676
if(quit_now){
1677
errno = old_errno;
1678
return EINTR;
1679
}
1680
1681
if(not interface_is_up(interface)){
1682
error_t ret_errno = 0, ioctl_errno = 0;
1683
if(not get_flags(interface, &network)){
1684
ret_errno = errno;
1685
fprintf_plus(stderr, "Failed to get flags for interface "
1686
"\"%s\"\n", interface);
1687
errno = old_errno;
1688
return ret_errno;
1689
}
1690
network.ifr_flags |= IFF_UP; /* set flag */
1691
1692
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1693
if(sd == -1){
1694
ret_errno = errno;
1695
perror_plus("socket");
1696
errno = old_errno;
1697
return ret_errno;
1698
}
1699
1700
if(quit_now){
1701
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1702
if(ret == -1){
1703
perror_plus("close");
1704
}
1705
errno = old_errno;
1706
return EINTR;
1707
}
1708
1709
if(debug){
1710
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1711
interface);
1712
}
1713
1714
/* Raise privileges */
1715
ret_errno = raise_privileges();
1716
bool restore_loglevel = false;
1717
if(ret_errno != 0){
1718
perror_plus("Failed to raise privileges");
1719
}
1720
#ifdef __linux__
1721
int ret_linux;
1722
if(ret_errno == 0){
1723
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1724
messages about the network interface to mess up the prompt */
1725
ret_linux = klogctl(8, NULL, 5);
1726
if(ret_linux == -1){
1727
perror_plus("klogctl");
1728
} else {
1729
restore_loglevel = true;
1730
}
1731
}
1732
#endif /* __linux__ */
1733
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1734
ioctl_errno = errno;
1735
#ifdef __linux__
1736
if(restore_loglevel){
1737
ret_linux = klogctl(7, NULL, 0);
1738
if(ret_linux == -1){
1739
perror_plus("klogctl");
1740
}
1741
}
1742
#endif /* __linux__ */
1743
1744
/* If raise_privileges() succeeded above */
1745
if(ret_errno == 0){
1746
/* Lower privileges */
1747
ret_errno = lower_privileges();
1748
if(ret_errno != 0){
1749
errno = ret_errno;
1750
perror_plus("Failed to lower privileges");
1751
}
1752
}
1753
1754
/* Close the socket */
1755
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1756
if(ret == -1){
1757
perror_plus("close");
1758
}
1759
1760
if(ret_setflags == -1){
1761
errno = ioctl_errno;
1762
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1763
errno = old_errno;
1764
return ioctl_errno;
1765
}
1766
} else if(debug){
1767
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1768
interface);
1769
}
1770
1771
/* Sleep checking until interface is running.
1772
Check every 0.25s, up to total time of delay */
1773
for(int i=0; i < delay * 4; i++){
1774
if(interface_is_running(interface)){
1775
break;
1776
}
1777
struct timespec sleeptime = { .tv_nsec = 250000000 };
1778
ret = nanosleep(&sleeptime, NULL);
1779
if(ret == -1 and errno != EINTR){
1780
perror_plus("nanosleep");
1781
}
1782
}
1783
1784
errno = old_errno;
1785
return 0;
1786
}
1787
1788
__attribute__((nonnull, warn_unused_result))
1789
error_t take_down_interface(const char *const interface){
1790
error_t old_errno = errno;
1791
struct ifreq network;
1792
unsigned int if_index = if_nametoindex(interface);
1793
if(if_index == 0){
1794
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1795
errno = old_errno;
1796
return ENXIO;
1797
}
1798
if(interface_is_up(interface)){
1799
error_t ret_errno = 0, ioctl_errno = 0;
1800
if(not get_flags(interface, &network) and debug){
1801
ret_errno = errno;
1802
fprintf_plus(stderr, "Failed to get flags for interface "
1803
"\"%s\"\n", interface);
1804
errno = old_errno;
1805
return ret_errno;
1806
}
1807
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1808
1809
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1810
if(sd == -1){
1811
ret_errno = errno;
1812
perror_plus("socket");
1813
errno = old_errno;
1814
return ret_errno;
1815
}
1816
1817
if(debug){
1818
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1819
interface);
1820
}
1821
1822
/* Raise privileges */
1823
ret_errno = raise_privileges();
1824
if(ret_errno != 0){
1825
perror_plus("Failed to raise privileges");
1826
}
1827
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1828
ioctl_errno = errno;
1829
1830
/* If raise_privileges() succeeded above */
1831
if(ret_errno == 0){
1832
/* Lower privileges */
1833
ret_errno = lower_privileges();
1834
if(ret_errno != 0){
1835
errno = ret_errno;
1836
perror_plus("Failed to lower privileges");
1837
}
1838
}
1839
1840
/* Close the socket */
1841
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1842
if(ret == -1){
1843
perror_plus("close");
1844
}
1845
1846
if(ret_setflags == -1){
1847
errno = ioctl_errno;
1848
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1849
errno = old_errno;
1850
return ioctl_errno;
1851
}
1852
} else if(debug){
1853
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1854
interface);
1855
}
1856
1857
errno = old_errno;
1858
return 0;
1859
}
1860
1861
int main(int argc, char *argv[]){
1862
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1863
.priority = "SECURE256:!CTYPE-X.509:"
1864
"+CTYPE-OPENPGP", .current_server = NULL,
1865
.interfaces = NULL, .interfaces_size = 0 };
1866
AvahiSServiceBrowser *sb = NULL;
1867
error_t ret_errno;
1868
int ret;
1869
intmax_t tmpmax;
1870
char *tmp;
1871
int exitcode = EXIT_SUCCESS;
1872
char *interfaces_to_take_down = NULL;
1873
size_t interfaces_to_take_down_size = 0;
1874
char tempdir[] = "/tmp/mandosXXXXXX";
1875
bool tempdir_created = false;
1876
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1877
const char *seckey = PATHDIR "/" SECKEY;
1878
const char *pubkey = PATHDIR "/" PUBKEY;
1879
char *interfaces_hooks = NULL;
1880
1881
bool gnutls_initialized = false;
1882
bool gpgme_initialized = false;
1883
float delay = 2.5f;
1884
double retry_interval = 10; /* 10s between trying a server and
1885
retrying the same server again */
1886
1887
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1888
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1889
1890
uid = getuid();
1891
gid = getgid();
1892
1893
/* Lower any group privileges we might have, just to be safe */
1894
errno = 0;
1895
ret = setgid(gid);
1896
if(ret == -1){
1897
perror_plus("setgid");
1898
}
1899
1900
/* Lower user privileges (temporarily) */
1901
errno = 0;
1902
ret = seteuid(uid);
1903
if(ret == -1){
1904
perror_plus("seteuid");
1905
}
1906
1907
if(quit_now){
1908
goto end;
1909
}
1910
1911
{
1912
struct argp_option options[] = {
1913
{ .name = "debug", .key = 128,
1914
.doc = "Debug mode", .group = 3 },
1915
{ .name = "connect", .key = 'c',
1916
.arg = "ADDRESS:PORT",
1917
.doc = "Connect directly to a specific Mandos server",
1918
.group = 1 },
1919
{ .name = "interface", .key = 'i',
1920
.arg = "NAME",
1921
.doc = "Network interface that will be used to search for"
1922
" Mandos servers",
1923
.group = 1 },
1924
{ .name = "seckey", .key = 's',
1925
.arg = "FILE",
1926
.doc = "OpenPGP secret key file base name",
1927
.group = 1 },
1928
{ .name = "pubkey", .key = 'p',
1929
.arg = "FILE",
1930
.doc = "OpenPGP public key file base name",
1931
.group = 2 },
1932
{ .name = "dh-bits", .key = 129,
1933
.arg = "BITS",
1934
.doc = "Bit length of the prime number used in the"
1935
" Diffie-Hellman key exchange",
1936
.group = 2 },
1937
{ .name = "priority", .key = 130,
1938
.arg = "STRING",
1939
.doc = "GnuTLS priority string for the TLS handshake",
1940
.group = 1 },
1941
{ .name = "delay", .key = 131,
1942
.arg = "SECONDS",
1943
.doc = "Maximum delay to wait for interface startup",
1944
.group = 2 },
1945
{ .name = "retry", .key = 132,
1946
.arg = "SECONDS",
1947
.doc = "Retry interval used when denied by the Mandos server",
1948
.group = 2 },
1949
{ .name = "network-hook-dir", .key = 133,
1950
.arg = "DIR",
1951
.doc = "Directory where network hooks are located",
1952
.group = 2 },
1953
/*
1954
* These reproduce what we would get without ARGP_NO_HELP
1955
*/
1956
{ .name = "help", .key = '?',
1957
.doc = "Give this help list", .group = -1 },
1958
{ .name = "usage", .key = -3,
1959
.doc = "Give a short usage message", .group = -1 },
1960
{ .name = "version", .key = 'V',
1961
.doc = "Print program version", .group = -1 },
1962
{ .name = NULL }
1963
};
1964
1965
error_t parse_opt(int key, char *arg,
1966
struct argp_state *state){
1967
errno = 0;
1968
switch(key){
1969
case 128: /* --debug */
1970
debug = true;
1971
break;
1972
case 'c': /* --connect */
1973
connect_to = arg;
1974
break;
1975
case 'i': /* --interface */
1976
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1977
arg, (int)',');
1978
if(ret_errno != 0){
1979
argp_error(state, "%s", strerror(ret_errno));
1980
}
1981
break;
1982
case 's': /* --seckey */
1983
seckey = arg;
1984
break;
1985
case 'p': /* --pubkey */
1986
pubkey = arg;
1987
break;
1988
case 129: /* --dh-bits */
1989
errno = 0;
1990
tmpmax = strtoimax(arg, &tmp, 10);
1991
if(errno != 0 or tmp == arg or *tmp != '\0'
1992
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1993
argp_error(state, "Bad number of DH bits");
1994
}
1995
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1996
break;
1997
case 130: /* --priority */
1998
mc.priority = arg;
1999
break;
2000
case 131: /* --delay */
2001
errno = 0;
2002
delay = strtof(arg, &tmp);
2003
if(errno != 0 or tmp == arg or *tmp != '\0'){
2004
argp_error(state, "Bad delay");
2005
}
2006
case 132: /* --retry */
2007
errno = 0;
2008
retry_interval = strtod(arg, &tmp);
2009
if(errno != 0 or tmp == arg or *tmp != '\0'
2010
or (retry_interval * 1000) > INT_MAX
2011
or retry_interval < 0){
2012
argp_error(state, "Bad retry interval");
2013
}
2014
break;
2015
case 133: /* --network-hook-dir */
2016
hookdir = arg;
2017
break;
2018
/*
2019
* These reproduce what we would get without ARGP_NO_HELP
2020
*/
2021
case '?': /* --help */
2022
argp_state_help(state, state->out_stream,
2023
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2024
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2025
case -3: /* --usage */
2026
argp_state_help(state, state->out_stream,
2027
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2028
case 'V': /* --version */
2029
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2030
exit(argp_err_exit_status);
2031
break;
2032
default:
2033
return ARGP_ERR_UNKNOWN;
2034
}
2035
return errno;
2036
}
2037
2038
struct argp argp = { .options = options, .parser = parse_opt,
2039
.args_doc = "",
2040
.doc = "Mandos client -- Get and decrypt"
2041
" passwords from a Mandos server" };
2042
ret = argp_parse(&argp, argc, argv,
2043
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2044
switch(ret){
2045
case 0:
2046
break;
2047
case ENOMEM:
2048
default:
2049
errno = ret;
2050
perror_plus("argp_parse");
2051
exitcode = EX_OSERR;
2052
goto end;
2053
case EINVAL:
2054
exitcode = EX_USAGE;
2055
goto end;
2056
}
2057
}
2058
2059
{
2060
/* Work around Debian bug #633582:
2061
<http://bugs.debian.org/633582> */
2062
2063
/* Re-raise privileges */
2064
ret_errno = raise_privileges();
2065
if(ret_errno != 0){
2066
errno = ret_errno;
2067
perror_plus("Failed to raise privileges");
2068
} else {
2069
struct stat st;
2070
2071
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2072
int seckey_fd = open(seckey, O_RDONLY);
2073
if(seckey_fd == -1){
2074
perror_plus("open");
2075
} else {
2076
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2077
if(ret == -1){
2078
perror_plus("fstat");
2079
} else {
2080
if(S_ISREG(st.st_mode)
2081
and st.st_uid == 0 and st.st_gid == 0){
2082
ret = fchown(seckey_fd, uid, gid);
2083
if(ret == -1){
2084
perror_plus("fchown");
2085
}
2086
}
2087
}
2088
TEMP_FAILURE_RETRY(close(seckey_fd));
2089
}
2090
}
2091
2092
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2093
int pubkey_fd = open(pubkey, O_RDONLY);
2094
if(pubkey_fd == -1){
2095
perror_plus("open");
2096
} else {
2097
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2098
if(ret == -1){
2099
perror_plus("fstat");
2100
} else {
2101
if(S_ISREG(st.st_mode)
2102
and st.st_uid == 0 and st.st_gid == 0){
2103
ret = fchown(pubkey_fd, uid, gid);
2104
if(ret == -1){
2105
perror_plus("fchown");
2106
}
2107
}
2108
}
2109
TEMP_FAILURE_RETRY(close(pubkey_fd));
2110
}
2111
}
2112
2113
/* Lower privileges */
2114
ret_errno = lower_privileges();
2115
if(ret_errno != 0){
2116
errno = ret_errno;
2117
perror_plus("Failed to lower privileges");
2118
}
2119
}
2120
}
2121
2122
/* Remove invalid interface names (except "none") */
2123
{
2124
char *interface = NULL;
2125
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2126
interface))){
2127
if(strcmp(interface, "none") != 0
2128
and if_nametoindex(interface) == 0){
2129
if(interface[0] != '\0'){
2130
fprintf_plus(stderr, "Not using nonexisting interface"
2131
" \"%s\"\n", interface);
2132
}
2133
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2134
interface = NULL;
2135
}
2136
}
2137
}
2138
2139
/* Run network hooks */
2140
{
2141
if(mc.interfaces != NULL){
2142
interfaces_hooks = malloc(mc.interfaces_size);
2143
if(interfaces_hooks == NULL){
2144
perror_plus("malloc");
2145
goto end;
2146
}
2147
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2148
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2149
}
2150
run_network_hooks("start", interfaces_hooks != NULL ?
2151
interfaces_hooks : "", delay);
2152
}
2153
2154
if(not debug){
2155
avahi_set_log_function(empty_log);
2156
}
2157
2158
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2159
from the signal handler */
2160
/* Initialize the pseudo-RNG for Avahi */
2161
srand((unsigned int) time(NULL));
2162
simple_poll = avahi_simple_poll_new();
2163
if(simple_poll == NULL){
2164
fprintf_plus(stderr,
2165
"Avahi: Failed to create simple poll object.\n");
2166
exitcode = EX_UNAVAILABLE;
2167
goto end;
2168
}
2169
2170
sigemptyset(&sigterm_action.sa_mask);
2171
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2172
if(ret == -1){
2173
perror_plus("sigaddset");
2174
exitcode = EX_OSERR;
2175
goto end;
2176
}
2177
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2178
if(ret == -1){
2179
perror_plus("sigaddset");
2180
exitcode = EX_OSERR;
2181
goto end;
2182
}
2183
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2184
if(ret == -1){
2185
perror_plus("sigaddset");
2186
exitcode = EX_OSERR;
2187
goto end;
2188
}
2189
/* Need to check if the handler is SIG_IGN before handling:
2190
| [[info:libc:Initial Signal Actions]] |
2191
| [[info:libc:Basic Signal Handling]] |
2192
*/
2193
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2194
if(ret == -1){
2195
perror_plus("sigaction");
2196
return EX_OSERR;
2197
}
2198
if(old_sigterm_action.sa_handler != SIG_IGN){
2199
ret = sigaction(SIGINT, &sigterm_action, NULL);
2200
if(ret == -1){
2201
perror_plus("sigaction");
2202
exitcode = EX_OSERR;
2203
goto end;
2204
}
2205
}
2206
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2207
if(ret == -1){
2208
perror_plus("sigaction");
2209
return EX_OSERR;
2210
}
2211
if(old_sigterm_action.sa_handler != SIG_IGN){
2212
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2213
if(ret == -1){
2214
perror_plus("sigaction");
2215
exitcode = EX_OSERR;
2216
goto end;
2217
}
2218
}
2219
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2220
if(ret == -1){
2221
perror_plus("sigaction");
2222
return EX_OSERR;
2223
}
2224
if(old_sigterm_action.sa_handler != SIG_IGN){
2225
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2226
if(ret == -1){
2227
perror_plus("sigaction");
2228
exitcode = EX_OSERR;
2229
goto end;
2230
}
2231
}
2232
2233
/* If no interfaces were specified, make a list */
2234
if(mc.interfaces == NULL){
2235
struct dirent **direntries;
2236
/* Look for any good interfaces */
2237
ret = scandir(sys_class_net, &direntries, good_interface,
2238
alphasort);
2239
if(ret >= 1){
2240
/* Add all found interfaces to interfaces list */
2241
for(int i = 0; i < ret; ++i){
2242
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2243
direntries[i]->d_name);
2244
if(ret_errno != 0){
2245
errno = ret_errno;
2246
perror_plus("argz_add");
2247
continue;
2248
}
2249
if(debug){
2250
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2251
direntries[i]->d_name);
2252
}
2253
}
2254
free(direntries);
2255
} else {
2256
free(direntries);
2257
fprintf_plus(stderr, "Could not find a network interface\n");
2258
exitcode = EXIT_FAILURE;
2259
goto end;
2260
}
2261
}
2262
2263
/* Bring up interfaces which are down, and remove any "none"s */
2264
{
2265
char *interface = NULL;
2266
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2267
interface))){
2268
/* If interface name is "none", stop bringing up interfaces.
2269
Also remove all instances of "none" from the list */
2270
if(strcmp(interface, "none") == 0){
2271
argz_delete(&mc.interfaces, &mc.interfaces_size,
2272
interface);
2273
interface = NULL;
2274
while((interface = argz_next(mc.interfaces,
2275
mc.interfaces_size, interface))){
2276
if(strcmp(interface, "none") == 0){
2277
argz_delete(&mc.interfaces, &mc.interfaces_size,
2278
interface);
2279
interface = NULL;
2280
}
2281
}
2282
break;
2283
}
2284
bool interface_was_up = interface_is_up(interface);
2285
errno = bring_up_interface(interface, delay);
2286
if(not interface_was_up){
2287
if(errno != 0){
2288
perror_plus("Failed to bring up interface");
2289
} else {
2290
errno = argz_add(&interfaces_to_take_down,
2291
&interfaces_to_take_down_size,
2292
interface);
2293
if(errno != 0){
2294
perror_plus("argz_add");
2295
}
2296
}
2297
}
2298
}
2299
if(debug and (interfaces_to_take_down == NULL)){
2300
fprintf_plus(stderr, "No interfaces were brought up\n");
2301
}
2302
}
2303
2304
/* If we only got one interface, explicitly use only that one */
2305
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2306
if(debug){
2307
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2308
mc.interfaces);
2309
}
2310
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2311
}
2312
2313
if(quit_now){
2314
goto end;
2315
}
2316
2317
ret = init_gnutls_global(pubkey, seckey, &mc);
2318
if(ret == -1){
2319
fprintf_plus(stderr, "init_gnutls_global failed\n");
2320
exitcode = EX_UNAVAILABLE;
2321
goto end;
2322
} else {
2323
gnutls_initialized = true;
2324
}
2325
2326
if(quit_now){
2327
goto end;
2328
}
2329
2330
if(mkdtemp(tempdir) == NULL){
2331
perror_plus("mkdtemp");
2332
goto end;
2333
}
2334
tempdir_created = true;
2335
2336
if(quit_now){
2337
goto end;
2338
}
2339
2340
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2341
fprintf_plus(stderr, "init_gpgme failed\n");
2342
exitcode = EX_UNAVAILABLE;
2343
goto end;
2344
} else {
2345
gpgme_initialized = true;
2346
}
2347
2348
if(quit_now){
2349
goto end;
2350
}
2351
2352
if(connect_to != NULL){
2353
/* Connect directly, do not use Zeroconf */
2354
/* (Mainly meant for debugging) */
2355
char *address = strrchr(connect_to, ':');
2356
2357
if(address == NULL){
2358
fprintf_plus(stderr, "No colon in address\n");
2359
exitcode = EX_USAGE;
2360
goto end;
2361
}
2362
2363
if(quit_now){
2364
goto end;
2365
}
2366
2367
in_port_t port;
2368
errno = 0;
2369
tmpmax = strtoimax(address+1, &tmp, 10);
2370
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2371
or tmpmax != (in_port_t)tmpmax){
2372
fprintf_plus(stderr, "Bad port number\n");
2373
exitcode = EX_USAGE;
2374
goto end;
2375
}
2376
2377
if(quit_now){
2378
goto end;
2379
}
2380
2381
port = (in_port_t)tmpmax;
2382
*address = '\0';
2383
/* Colon in address indicates IPv6 */
2384
int af;
2385
if(strchr(connect_to, ':') != NULL){
2386
af = AF_INET6;
2387
/* Accept [] around IPv6 address - see RFC 5952 */
2388
if(connect_to[0] == '[' and address[-1] == ']')
2389
{
2390
connect_to++;
2391
address[-1] = '\0';
2392
}
2393
} else {
2394
af = AF_INET;
2395
}
2396
address = connect_to;
2397
2398
if(quit_now){
2399
goto end;
2400
}
2401
2402
while(not quit_now){
2403
ret = start_mandos_communication(address, port, if_index, af,
2404
&mc);
2405
if(quit_now or ret == 0){
2406
break;
2407
}
2408
if(debug){
2409
fprintf_plus(stderr, "Retrying in %d seconds\n",
2410
(int)retry_interval);
2411
}
2412
sleep((unsigned int)retry_interval);
2413
}
2414
2415
if(not quit_now){
2416
exitcode = EXIT_SUCCESS;
2417
}
2418
2419
goto end;
2420
}
2421
2422
if(quit_now){
2423
goto end;
2424
}
2425
2426
{
2427
AvahiServerConfig config;
2428
/* Do not publish any local Zeroconf records */
2429
avahi_server_config_init(&config);
2430
config.publish_hinfo = 0;
2431
config.publish_addresses = 0;
2432
config.publish_workstation = 0;
2433
config.publish_domain = 0;
2434
2435
/* Allocate a new server */
2436
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2437
&config, NULL, NULL, &ret_errno);
2438
2439
/* Free the Avahi configuration data */
2440
avahi_server_config_free(&config);
2441
}
2442
2443
/* Check if creating the Avahi server object succeeded */
2444
if(mc.server == NULL){
2445
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2446
avahi_strerror(ret_errno));
2447
exitcode = EX_UNAVAILABLE;
2448
goto end;
2449
}
2450
2451
if(quit_now){
2452
goto end;
2453
}
2454
2455
/* Create the Avahi service browser */
2456
sb = avahi_s_service_browser_new(mc.server, if_index,
2457
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2458
NULL, 0, browse_callback,
2459
(void *)&mc);
2460
if(sb == NULL){
2461
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2462
avahi_strerror(avahi_server_errno(mc.server)));
2463
exitcode = EX_UNAVAILABLE;
2464
goto end;
2465
}
2466
2467
if(quit_now){
2468
goto end;
2469
}
2470
2471
/* Run the main loop */
2472
2473
if(debug){
2474
fprintf_plus(stderr, "Starting Avahi loop search\n");
2475
}
2476
2477
ret = avahi_loop_with_timeout(simple_poll,
2478
(int)(retry_interval * 1000), &mc);
2479
if(debug){
2480
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2481
(ret == 0) ? "successfully" : "with error");
2482
}
2483
2484
end:
2485
2486
if(debug){
2487
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2488
}
2489
2490
/* Cleanup things */
2491
free(mc.interfaces);
2492
2493
if(sb != NULL)
2494
avahi_s_service_browser_free(sb);
2495
2496
if(mc.server != NULL)
2497
avahi_server_free(mc.server);
2498
2499
if(simple_poll != NULL)
2500
avahi_simple_poll_free(simple_poll);
2501
2502
if(gnutls_initialized){
2503
gnutls_certificate_free_credentials(mc.cred);
2504
gnutls_global_deinit();
2505
gnutls_dh_params_deinit(mc.dh_params);
2506
}
2507
2508
if(gpgme_initialized){
2509
gpgme_release(mc.ctx);
2510
}
2511
2512
/* Cleans up the circular linked list of Mandos servers the client
2513
has seen */
2514
if(mc.current_server != NULL){
2515
mc.current_server->prev->next = NULL;
2516
while(mc.current_server != NULL){
2517
server *next = mc.current_server->next;
2518
free(mc.current_server);
2519
mc.current_server = next;
2520
}
2521
}
2522
2523
/* Re-raise privileges */
2524
{
2525
ret_errno = raise_privileges();
2526
if(ret_errno != 0){
2527
perror_plus("Failed to raise privileges");
2528
} else {
2529
2530
/* Run network hooks */
2531
run_network_hooks("stop", interfaces_hooks != NULL ?
2532
interfaces_hooks : "", delay);
2533
2534
/* Take down the network interfaces which were brought up */
2535
{
2536
char *interface = NULL;
2537
while((interface=argz_next(interfaces_to_take_down,
2538
interfaces_to_take_down_size,
2539
interface))){
2540
ret_errno = take_down_interface(interface);
2541
if(ret_errno != 0){
2542
errno = ret_errno;
2543
perror_plus("Failed to take down interface");
2544
}
2545
}
2546
if(debug and (interfaces_to_take_down == NULL)){
2547
fprintf_plus(stderr, "No interfaces needed to be taken"
2548
" down\n");
2549
}
2550
}
2551
}
2552
ret_errno = lower_privileges_permanently();
2553
if(ret_errno != 0){
2554
perror_plus("Failed to lower privileges permanently");
2555
}
2556
}
2557
2558
free(interfaces_to_take_down);
2559
free(interfaces_hooks);
2560
2561
/* Removes the GPGME temp directory and all files inside */
2562
if(tempdir_created){
2563
struct dirent **direntries = NULL;
2564
struct dirent *direntry = NULL;
2565
int numentries = scandir(tempdir, &direntries, notdotentries,
2566
alphasort);
2567
if(numentries > 0){
2568
for(int i = 0; i < numentries; i++){
2569
direntry = direntries[i];
2570
char *fullname = NULL;
2571
ret = asprintf(&fullname, "%s/%s", tempdir,
2572
direntry->d_name);
2573
if(ret < 0){
2574
perror_plus("asprintf");
2575
continue;
2576
}
2577
ret = remove(fullname);
2578
if(ret == -1){
2579
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2580
strerror(errno));
2581
}
2582
free(fullname);
2583
}
2584
}
2585
2586
/* need to clean even if 0 because man page doesn't specify */
2587
free(direntries);
2588
if(numentries == -1){
2589
perror_plus("scandir");
2590
}
2591
ret = rmdir(tempdir);
2592
if(ret == -1 and errno != ENOENT){
2593
perror_plus("rmdir");
2594
}
2595
}
2596
2597
if(quit_now){
2598
sigemptyset(&old_sigterm_action.sa_mask);
2599
old_sigterm_action.sa_handler = SIG_DFL;
2600
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2601
&old_sigterm_action,
2602
NULL));
2603
if(ret == -1){
2604
perror_plus("sigaction");
2605
}
2606
do {
2607
ret = raise(signal_received);
2608
} while(ret != 0 and errno == EINTR);
2609
if(ret != 0){
2610
perror_plus("raise");
2611
abort();
2612
}
2613
TEMP_FAILURE_RETRY(pause());
2614
}
2615
2616
return exitcode;
1147
}
1148
}
1149
closedir(d);
1150
}
1151
ret = rmdir(tempdir);
1152
if(ret == -1 and errno != ENOENT){
1153
perror("rmdir");
1154
}
1155
}
1156
1157
return exitcode;
2617
1158
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0