To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/release
« back to all changes in this revision
Viewing changes to plugins.d/mandos-client.c
- browse files at revision 172
- compare with another revision
- download diff
- download tarball
- view history from revision 172
- Committer: Teddy Hogeborn
- Date: 2008-09-06 16:33:08 UTC
- Revision ID: teddy@fukt.bsnet.se-20080906163308-ciy82qw6jollqrjd
* plugins.d/mandos-client.xml (NAME, OVERVIEW, EXIT STATUS): Improved
wording.
wording.
- files added:
- etc-plugins.d-README
- files removed:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- debian/upstream
- network-hooks.d
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
1
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
* Mandos-client - get and decrypt data from a Mandos server
3
* Mandos client - get and decrypt data from a Mandos server
4
4
*
5
5
* This program is partly derived from an example program for an Avahi
6
6
* service browser, downloaded from
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 Björn Påhlsson
12
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
14
13
*
15
14
* This program is free software: you can redistribute it and/or
16
15
* modify it under the terms of the GNU General Public License as
26
25
* along with this program. If not, see
27
26
* <http://www.gnu.org/licenses/>.
28
27
*
29
* Contact the authors at <mandos@recompile.se>.
28
* Contact the authors at <mandos@fukt.bsnet.se>.
30
29
*/
31
30
32
31
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
34
32
#define _LARGEFILE_SOURCE
35
#endif /* not _LARGEFILE_SOURCE */
36
#ifndef _FILE_OFFSET_BITS
37
33
#define _FILE_OFFSET_BITS 64
38
#endif /* not _FILE_OFFSET_BITS */
39
34
40
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
36
42
37
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
38
stdout, ferror() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
39
#include <stdint.h> /* uint16_t, uint32_t */
45
40
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
#include <stdbool.h> /* bool, false, true */
41
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
42
srand() */
43
#include <stdbool.h> /* bool, true */
49
44
#include <string.h> /* memset(), strcmp(), strlen(),
50
45
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
46
#include <sys/ioctl.h> /* ioctl */
52
47
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
48
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
49
SOCK_STREAM, INET6_ADDRSTRLEN,
50
uid_t, gid_t, open(), opendir(), DIR */
51
#include <sys/stat.h> /* open() */
57
52
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
*/
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
strtoimax() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
53
struct in6_addr, inet_pton(),
54
connect() */
55
#include <fcntl.h> /* open() */
56
#include <dirent.h> /* opendir(), struct dirent, readdir() */
57
#include <inttypes.h> /* PRIu16 */
58
#include <assert.h> /* assert() */
59
#include <errno.h> /* perror(), errno */
60
#include <time.h> /* time() */
68
61
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
62
SIOCSIFFLAGS, if_indextoname(),
70
63
if_nametoindex(), IF_NAMESIZE */
71
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
*/
64
#include <netinet/in.h>
74
65
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
79
#include <iso646.h> /* not, or, and */
66
getuid(), getgid(), setuid(),
67
setgid() */
68
#include <arpa/inet.h> /* inet_pton(), htons */
69
#include <iso646.h> /* not, and */
80
70
#include <argp.h> /* struct argp_option, error_t, struct
81
71
argp_state, struct argp,
82
72
argp_parse(), ARGP_KEY_ARG,
83
73
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
84
#include <signal.h> /* sigemptyset(), sigaddset(),
85
sigaction(), SIGTERM, sig_atomic_t,
86
raise() */
87
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
88
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
89
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
90
WEXITSTATUS(), WTERMSIG() */
91
#include <grp.h> /* setgroups() */
92
#include <argz.h> /* argz_add_sep(), argz_next(),
93
argz_delete(), argz_append(),
94
argz_stringify(), argz_add(),
95
argz_count() */
96
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
97
EAI_SYSTEM, gai_strerror() */
98
99
#ifdef __linux__
100
#include <sys/klog.h> /* klogctl() */
101
#endif /* __linux__ */
102
74
103
75
/* Avahi */
104
76
/* All Avahi types, constants and functions
117
89
gnutls_*
118
90
init_gnutls_session(),
119
91
GNUTLS_* */
120
#include <gnutls/openpgp.h>
121
/* gnutls_certificate_set_openpgp_key_file(),
122
GNUTLS_OPENPGP_FMT_BASE64 */
92
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
93
GNUTLS_OPENPGP_FMT_BASE64 */
123
94
124
95
/* GPGME */
125
96
#include <gpgme.h> /* All GPGME types, constants and
130
101
131
102
#define BUFFER_SIZE 256
132
103
104
/*
105
#define PATHDIR "/conf/conf.d/mandos"
106
*/
107
133
108
#define PATHDIR "/conf/conf.d/mandos"
134
109
#define SECKEY "seckey.txt"
135
110
#define PUBKEY "pubkey.txt"
136
#define HOOKDIR "/lib/mandos/network-hooks.d"
137
111
138
112
bool debug = false;
139
113
static const char mandos_protocol_version[] = "1";
140
const char *argp_program_version = "mandos-client " VERSION;
141
const char *argp_program_bug_address = "<mandos@recompile.se>";
142
static const char sys_class_net[] = "/sys/class/net";
143
char *connect_to = NULL;
144
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
146
uid_t uid = 65534;
147
gid_t gid = 65534;
148
149
/* Doubly linked list that need to be circularly linked when used */
150
typedef struct server{
151
const char *ip;
152
in_port_t port;
153
AvahiIfIndex if_index;
154
int af;
155
struct timespec last_seen;
156
struct server *next;
157
struct server *prev;
158
} server;
114
const char *argp_program_version = "mandos-client 1.0";
115
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
159
116
160
117
/* Used for passing in values through the Avahi callback functions */
161
118
typedef struct {
119
AvahiSimplePoll *simple_poll;
162
120
AvahiServer *server;
163
121
gnutls_certificate_credentials_t cred;
164
122
unsigned int dh_bits;
165
123
gnutls_dh_params_t dh_params;
166
124
const char *priority;
167
125
gpgme_ctx_t ctx;
168
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
171
126
} mandos_context;
172
127
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
175
176
sig_atomic_t quit_now = 0;
177
int signal_received = 0;
178
179
/* Function to use when printing errors */
180
void perror_plus(const char *print_text){
181
int e = errno;
182
fprintf(stderr, "Mandos plugin %s: ",
183
program_invocation_short_name);
184
errno = e;
185
perror(print_text);
186
}
187
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
189
int fprintf_plus(FILE *stream, const char *format, ...){
190
va_list ap;
191
va_start (ap, format);
192
193
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
194
program_invocation_short_name));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
196
}
197
198
128
/*
199
* Make additional room in "buffer" for at least BUFFER_SIZE more
200
* 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,
201
131
* "buffer_length" is how much is already used.
202
132
*/
203
__attribute__((nonnull, warn_unused_result))
204
size_t incbuffer(char **buffer, size_t buffer_length,
205
size_t buffer_capacity){
206
if(buffer_length + BUFFER_SIZE > buffer_capacity){
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
208
if(new_buf == NULL){
209
int old_errno = errno;
210
free(*buffer);
211
errno = old_errno;
212
*buffer = NULL;
133
size_t adjustbuffer(char **buffer, size_t buffer_length,
134
size_t buffer_capacity){
135
if (buffer_length + BUFFER_SIZE > buffer_capacity){
136
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
137
if (buffer == NULL){
213
138
return 0;
214
139
}
215
*buffer = new_buf;
216
140
buffer_capacity += BUFFER_SIZE;
217
141
}
218
142
return buffer_capacity;
219
143
}
220
144
221
/* Add server to set of servers to retry periodically */
222
__attribute__((nonnull, warn_unused_result))
223
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
224
int af, server **current_server){
225
int ret;
226
server *new_server = malloc(sizeof(server));
227
if(new_server == NULL){
228
perror_plus("malloc");
229
return false;
230
}
231
*new_server = (server){ .ip = strdup(ip),
232
.port = port,
233
.if_index = if_index,
234
.af = af };
235
if(new_server->ip == NULL){
236
perror_plus("strdup");
237
return false;
238
}
239
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
240
if(ret == -1){
241
perror_plus("clock_gettime");
242
return false;
243
}
244
/* Special case of first server */
245
if(*current_server == NULL){
246
new_server->next = new_server;
247
new_server->prev = new_server;
248
*current_server = new_server;
249
} else {
250
/* Place the new server last in the list */
251
new_server->next = *current_server;
252
new_server->prev = (*current_server)->prev;
253
new_server->prev->next = new_server;
254
(*current_server)->prev = new_server;
255
}
256
return true;
257
}
258
259
145
/*
260
146
* Initialize GPGME.
261
147
*/
262
__attribute__((nonnull, warn_unused_result))
263
static bool init_gpgme(const char * const seckey,
264
const char * const pubkey,
265
const char * const tempdir,
266
mandos_context *mc){
148
static bool init_gpgme(mandos_context *mc, const char *seckey,
149
const char *pubkey, const char *tempdir){
150
int ret;
267
151
gpgme_error_t rc;
268
152
gpgme_engine_info_t engine_info;
269
153
154
270
155
/*
271
* Helper function to insert pub and seckey to the engine keyring.
156
* Helper function to insert pub and seckey to the enigne keyring.
272
157
*/
273
bool import_key(const char * const filename){
274
int ret;
158
bool import_key(const char *filename){
275
159
int fd;
276
160
gpgme_data_t pgp_data;
277
161
278
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
162
fd = TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
279
163
if(fd == -1){
280
perror_plus("open");
164
perror("open");
281
165
return false;
282
166
}
283
167
284
168
rc = gpgme_data_new_from_fd(&pgp_data, fd);
285
if(rc != GPG_ERR_NO_ERROR){
286
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
287
gpgme_strsource(rc), gpgme_strerror(rc));
169
if (rc != GPG_ERR_NO_ERROR){
170
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
171
gpgme_strsource(rc), gpgme_strerror(rc));
288
172
return false;
289
173
}
290
174
291
175
rc = gpgme_op_import(mc->ctx, pgp_data);
292
if(rc != GPG_ERR_NO_ERROR){
293
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
294
gpgme_strsource(rc), gpgme_strerror(rc));
176
if (rc != GPG_ERR_NO_ERROR){
177
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
178
gpgme_strsource(rc), gpgme_strerror(rc));
295
179
return false;
296
180
}
297
181
298
ret = (int)TEMP_FAILURE_RETRY(close(fd));
182
ret = TEMP_FAILURE_RETRY(close(fd));
299
183
if(ret == -1){
300
perror_plus("close");
184
perror("close");
301
185
}
302
186
gpgme_data_release(pgp_data);
303
187
return true;
304
188
}
305
189
306
if(debug){
307
fprintf_plus(stderr, "Initializing GPGME\n");
190
if (debug){
191
fprintf(stderr, "Initialize gpgme\n");
308
192
}
309
193
310
194
/* Init GPGME */
311
195
gpgme_check_version(NULL);
312
196
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
313
if(rc != GPG_ERR_NO_ERROR){
314
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
315
gpgme_strsource(rc), gpgme_strerror(rc));
197
if (rc != GPG_ERR_NO_ERROR){
198
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
199
gpgme_strsource(rc), gpgme_strerror(rc));
316
200
return false;
317
201
}
318
202
319
/* Set GPGME home directory for the OpenPGP engine only */
320
rc = gpgme_get_engine_info(&engine_info);
321
if(rc != GPG_ERR_NO_ERROR){
322
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
323
gpgme_strsource(rc), gpgme_strerror(rc));
203
/* Set GPGME home directory for the OpenPGP engine only */
204
rc = gpgme_get_engine_info (&engine_info);
205
if (rc != GPG_ERR_NO_ERROR){
206
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
207
gpgme_strsource(rc), gpgme_strerror(rc));
324
208
return false;
325
209
}
326
210
while(engine_info != NULL){
332
216
engine_info = engine_info->next;
333
217
}
334
218
if(engine_info == NULL){
335
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
336
tempdir);
219
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
337
220
return false;
338
221
}
339
222
340
223
/* Create new GPGME "context" */
341
224
rc = gpgme_new(&(mc->ctx));
342
if(rc != GPG_ERR_NO_ERROR){
343
fprintf_plus(stderr, "Mandos plugin mandos-client: "
344
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
345
gpgme_strerror(rc));
346
return false;
347
}
348
349
if(not import_key(pubkey) or not import_key(seckey)){
350
return false;
351
}
352
353
return true;
225
if (rc != GPG_ERR_NO_ERROR){
226
fprintf(stderr, "bad gpgme_new: %s: %s\n",
227
gpgme_strsource(rc), gpgme_strerror(rc));
228
return false;
229
}
230
231
if (not import_key(pubkey) or not import_key(seckey)){
232
return false;
233
}
234
235
return true;
354
236
}
355
237
356
238
/*
357
239
* Decrypt OpenPGP data.
358
240
* Returns -1 on error
359
241
*/
360
__attribute__((nonnull, warn_unused_result))
361
static ssize_t pgp_packet_decrypt(const char *cryptotext,
362
size_t crypto_size,
363
char **plaintext,
364
mandos_context *mc){
242
static ssize_t pgp_packet_decrypt (const mandos_context *mc,
243
const char *cryptotext,
244
size_t crypto_size,
245
char **plaintext){
365
246
gpgme_data_t dh_crypto, dh_plain;
366
247
gpgme_error_t rc;
367
248
ssize_t ret;
368
249
size_t plaintext_capacity = 0;
369
250
ssize_t plaintext_length = 0;
370
251
371
if(debug){
372
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
252
if (debug){
253
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
373
254
}
374
255
375
256
/* Create new GPGME data buffer from memory cryptotext */
376
257
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
377
258
0);
378
if(rc != GPG_ERR_NO_ERROR){
379
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
380
gpgme_strsource(rc), gpgme_strerror(rc));
259
if (rc != GPG_ERR_NO_ERROR){
260
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
261
gpgme_strsource(rc), gpgme_strerror(rc));
381
262
return -1;
382
263
}
383
264
384
265
/* Create new empty GPGME data buffer for the plaintext */
385
266
rc = gpgme_data_new(&dh_plain);
386
if(rc != GPG_ERR_NO_ERROR){
387
fprintf_plus(stderr, "Mandos plugin mandos-client: "
388
"bad gpgme_data_new: %s: %s\n",
389
gpgme_strsource(rc), gpgme_strerror(rc));
267
if (rc != GPG_ERR_NO_ERROR){
268
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
269
gpgme_strsource(rc), gpgme_strerror(rc));
390
270
gpgme_data_release(dh_crypto);
391
271
return -1;
392
272
}
394
274
/* Decrypt data from the cryptotext data buffer to the plaintext
395
275
data buffer */
396
276
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
397
if(rc != GPG_ERR_NO_ERROR){
398
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
399
gpgme_strsource(rc), gpgme_strerror(rc));
277
if (rc != GPG_ERR_NO_ERROR){
278
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
279
gpgme_strsource(rc), gpgme_strerror(rc));
400
280
plaintext_length = -1;
401
if(debug){
281
if (debug){
402
282
gpgme_decrypt_result_t result;
403
283
result = gpgme_op_decrypt_result(mc->ctx);
404
if(result == NULL){
405
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
284
if (result == NULL){
285
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
406
286
} else {
407
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
408
result->unsupported_algorithm);
409
fprintf_plus(stderr, "Wrong key usage: %u\n",
410
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);
411
291
if(result->file_name != NULL){
412
fprintf_plus(stderr, "File name: %s\n", result->file_name);
292
fprintf(stderr, "File name: %s\n", result->file_name);
413
293
}
414
294
gpgme_recipient_t recipient;
415
295
recipient = result->recipients;
416
while(recipient != NULL){
417
fprintf_plus(stderr, "Public key algorithm: %s\n",
418
gpgme_pubkey_algo_name
419
(recipient->pubkey_algo));
420
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
421
fprintf_plus(stderr, "Secret key available: %s\n",
422
recipient->status == GPG_ERR_NO_SECKEY
423
? "No" : "Yes");
424
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
}
425
306
}
426
307
}
427
308
}
429
310
}
430
311
431
312
if(debug){
432
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
313
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
433
314
}
434
315
435
316
/* Seek back to the beginning of the GPGME plaintext data buffer */
436
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
437
perror_plus("gpgme_data_seek");
317
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
318
perror("pgpme_data_seek");
438
319
plaintext_length = -1;
439
320
goto decrypt_end;
440
321
}
441
322
442
323
*plaintext = NULL;
443
324
while(true){
444
plaintext_capacity = incbuffer(plaintext,
445
(size_t)plaintext_length,
446
plaintext_capacity);
447
if(plaintext_capacity == 0){
448
perror_plus("incbuffer");
449
plaintext_length = -1;
450
goto decrypt_end;
325
plaintext_capacity = adjustbuffer(plaintext,
326
(size_t)plaintext_length,
327
plaintext_capacity);
328
if (plaintext_capacity == 0){
329
perror("adjustbuffer");
330
plaintext_length = -1;
331
goto decrypt_end;
451
332
}
452
333
453
334
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
454
335
BUFFER_SIZE);
455
336
/* Print the data, if any */
456
if(ret == 0){
337
if (ret == 0){
457
338
/* EOF */
458
339
break;
459
340
}
460
341
if(ret < 0){
461
perror_plus("gpgme_data_read");
342
perror("gpgme_data_read");
462
343
plaintext_length = -1;
463
344
goto decrypt_end;
464
345
}
466
347
}
467
348
468
349
if(debug){
469
fprintf_plus(stderr, "Decrypted password is: ");
350
fprintf(stderr, "Decrypted password is: ");
470
351
for(ssize_t i = 0; i < plaintext_length; i++){
471
352
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
472
353
}
483
364
return plaintext_length;
484
365
}
485
366
486
__attribute__((warn_unused_result))
487
static const char *safer_gnutls_strerror(int value){
488
const char *ret = gnutls_strerror(value);
489
if(ret == NULL)
367
static const char * safer_gnutls_strerror (int value) {
368
const char *ret = gnutls_strerror (value); /* Spurious warning */
369
if (ret == NULL)
490
370
ret = "(unknown)";
491
371
return ret;
492
372
}
493
373
494
374
/* GnuTLS log function callback */
495
__attribute__((nonnull))
496
375
static void debuggnutls(__attribute__((unused)) int level,
497
376
const char* string){
498
fprintf_plus(stderr, "GnuTLS: %s", string);
377
fprintf(stderr, "GnuTLS: %s", string);
499
378
}
500
379
501
__attribute__((nonnull, warn_unused_result))
502
static int init_gnutls_global(const char *pubkeyfilename,
503
const char *seckeyfilename,
504
mandos_context *mc){
380
static int init_gnutls_global(mandos_context *mc,
381
const char *pubkeyfilename,
382
const char *seckeyfilename){
505
383
int ret;
506
384
507
385
if(debug){
508
fprintf_plus(stderr, "Initializing GnuTLS\n");
386
fprintf(stderr, "Initializing GnuTLS\n");
509
387
}
510
388
511
389
ret = gnutls_global_init();
512
if(ret != GNUTLS_E_SUCCESS){
513
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
514
safer_gnutls_strerror(ret));
390
if (ret != GNUTLS_E_SUCCESS) {
391
fprintf (stderr, "GnuTLS global_init: %s\n",
392
safer_gnutls_strerror(ret));
515
393
return -1;
516
394
}
517
395
518
if(debug){
396
if (debug){
519
397
/* "Use a log level over 10 to enable all debugging options."
520
398
* - GnuTLS manual
521
399
*/
524
402
}
525
403
526
404
/* OpenPGP credentials */
527
ret = gnutls_certificate_allocate_credentials(&mc->cred);
528
if(ret != GNUTLS_E_SUCCESS){
529
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
530
safer_gnutls_strerror(ret));
531
gnutls_global_deinit();
405
gnutls_certificate_allocate_credentials(&mc->cred);
406
if (ret != GNUTLS_E_SUCCESS){
407
fprintf (stderr, "GnuTLS memory error: %s\n", /* Spurious
408
warning */
409
safer_gnutls_strerror(ret));
410
gnutls_global_deinit ();
532
411
return -1;
533
412
}
534
413
535
414
if(debug){
536
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
537
" secret key %s as GnuTLS credentials\n",
538
pubkeyfilename,
539
seckeyfilename);
415
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
416
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
417
seckeyfilename);
540
418
}
541
419
542
420
ret = gnutls_certificate_set_openpgp_key_file
543
421
(mc->cred, pubkeyfilename, seckeyfilename,
544
422
GNUTLS_OPENPGP_FMT_BASE64);
545
if(ret != GNUTLS_E_SUCCESS){
546
fprintf_plus(stderr,
547
"Error[%d] while reading the OpenPGP key pair ('%s',"
548
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
549
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
550
safer_gnutls_strerror(ret));
423
if (ret != GNUTLS_E_SUCCESS) {
424
fprintf(stderr,
425
"Error[%d] while reading the OpenPGP key pair ('%s',"
426
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
427
fprintf(stderr, "The GnuTLS error is: %s\n",
428
safer_gnutls_strerror(ret));
551
429
goto globalfail;
552
430
}
553
431
554
432
/* GnuTLS server initialization */
555
433
ret = gnutls_dh_params_init(&mc->dh_params);
556
if(ret != GNUTLS_E_SUCCESS){
557
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
558
" initialization: %s\n",
559
safer_gnutls_strerror(ret));
434
if (ret != GNUTLS_E_SUCCESS) {
435
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
436
" %s\n", safer_gnutls_strerror(ret));
560
437
goto globalfail;
561
438
}
562
439
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
563
if(ret != GNUTLS_E_SUCCESS){
564
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
565
safer_gnutls_strerror(ret));
440
if (ret != GNUTLS_E_SUCCESS) {
441
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
442
safer_gnutls_strerror(ret));
566
443
goto globalfail;
567
444
}
568
445
574
451
575
452
gnutls_certificate_free_credentials(mc->cred);
576
453
gnutls_global_deinit();
577
gnutls_dh_params_deinit(mc->dh_params);
578
454
return -1;
579
455
}
580
456
581
__attribute__((nonnull, warn_unused_result))
582
static int init_gnutls_session(gnutls_session_t *session,
583
mandos_context *mc){
457
static int init_gnutls_session(mandos_context *mc,
458
gnutls_session_t *session){
584
459
int ret;
585
460
/* GnuTLS session creation */
586
do {
587
ret = gnutls_init(session, GNUTLS_SERVER);
588
if(quit_now){
589
return -1;
590
}
591
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
592
if(ret != GNUTLS_E_SUCCESS){
593
fprintf_plus(stderr,
594
"Error in GnuTLS session initialization: %s\n",
595
safer_gnutls_strerror(ret));
461
ret = gnutls_init(session, GNUTLS_SERVER);
462
if (ret != GNUTLS_E_SUCCESS){
463
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
464
safer_gnutls_strerror(ret));
596
465
}
597
466
598
467
{
599
468
const char *err;
600
do {
601
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
602
if(quit_now){
603
gnutls_deinit(*session);
604
return -1;
605
}
606
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
607
if(ret != GNUTLS_E_SUCCESS){
608
fprintf_plus(stderr, "Syntax error at: %s\n", err);
609
fprintf_plus(stderr, "GnuTLS error: %s\n",
610
safer_gnutls_strerror(ret));
611
gnutls_deinit(*session);
469
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
470
if (ret != GNUTLS_E_SUCCESS) {
471
fprintf(stderr, "Syntax error at: %s\n", err);
472
fprintf(stderr, "GnuTLS error: %s\n",
473
safer_gnutls_strerror(ret));
474
gnutls_deinit (*session);
612
475
return -1;
613
476
}
614
477
}
615
478
616
do {
617
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
618
mc->cred);
619
if(quit_now){
620
gnutls_deinit(*session);
621
return -1;
622
}
623
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
624
if(ret != GNUTLS_E_SUCCESS){
625
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
626
safer_gnutls_strerror(ret));
627
gnutls_deinit(*session);
479
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
480
mc->cred);
481
if (ret != GNUTLS_E_SUCCESS) {
482
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
483
safer_gnutls_strerror(ret));
484
gnutls_deinit (*session);
628
485
return -1;
629
486
}
630
487
631
488
/* ignore client certificate if any. */
632
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
489
gnutls_certificate_server_set_request (*session,
490
GNUTLS_CERT_IGNORE);
633
491
634
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
492
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
635
493
636
494
return 0;
637
495
}
641
499
__attribute__((unused)) const char *txt){}
642
500
643
501
/* Called when a Mandos server is found */
644
__attribute__((nonnull, warn_unused_result))
645
static int start_mandos_communication(const char *ip, in_port_t port,
502
static int start_mandos_communication(const char *ip, uint16_t port,
646
503
AvahiIfIndex if_index,
647
int af, mandos_context *mc){
648
int ret, tcp_sd = -1;
649
ssize_t sret;
650
struct sockaddr_storage to;
504
mandos_context *mc){
505
int ret, tcp_sd;
506
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
651
507
char *buffer = NULL;
652
char *decrypted_buffer = NULL;
508
char *decrypted_buffer;
653
509
size_t buffer_length = 0;
654
510
size_t buffer_capacity = 0;
511
ssize_t decrypted_buffer_size;
655
512
size_t written;
656
int retval = -1;
513
int retval = 0;
514
char interface[IF_NAMESIZE];
657
515
gnutls_session_t session;
658
int pf; /* Protocol family */
659
660
errno = 0;
661
662
if(quit_now){
663
errno = EINTR;
664
return -1;
665
}
666
667
switch(af){
668
case AF_INET6:
669
pf = PF_INET6;
670
break;
671
case AF_INET:
672
pf = PF_INET;
673
break;
674
default:
675
fprintf_plus(stderr, "Bad address family: %d\n", af);
676
errno = EINVAL;
677
return -1;
678
}
679
680
/* If the interface is specified and we have a list of interfaces */
681
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
682
/* Check if the interface is one of the interfaces we are using */
683
bool match = false;
684
{
685
char *interface = NULL;
686
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
687
interface))){
688
if(if_nametoindex(interface) == (unsigned int)if_index){
689
match = true;
690
break;
691
}
692
}
693
}
694
if(not match){
695
/* This interface does not match any in the list, so we don't
696
connect to the server */
697
if(debug){
698
char interface[IF_NAMESIZE];
699
if(if_indextoname((unsigned int)if_index, interface) == NULL){
700
perror_plus("if_indextoname");
701
} else {
702
fprintf_plus(stderr, "Skipping server on non-used interface"
703
" \"%s\"\n",
704
if_indextoname((unsigned int)if_index,
705
interface));
706
}
707
}
516
517
ret = init_gnutls_session (mc, &session);
518
if (ret != 0){
519
return -1;
520
}
521
522
if(debug){
523
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
524
"\n", ip, port);
525
}
526
527
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
528
if(tcp_sd < 0) {
529
perror("socket");
530
return -1;
531
}
532
533
if(debug){
534
if(if_indextoname((unsigned int)if_index, interface) == NULL){
535
perror("if_indextoname");
708
536
return -1;
709
537
}
710
}
711
712
ret = init_gnutls_session(&session, mc);
713
if(ret != 0){
714
return -1;
715
}
716
717
if(debug){
718
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
719
PRIuMAX "\n", ip, (uintmax_t)port);
720
}
721
722
tcp_sd = socket(pf, SOCK_STREAM, 0);
723
if(tcp_sd < 0){
724
int e = errno;
725
perror_plus("socket");
726
errno = e;
727
goto mandos_end;
728
}
729
730
if(quit_now){
731
errno = EINTR;
732
goto mandos_end;
538
fprintf(stderr, "Binding to interface %s\n", interface);
733
539
}
734
540
735
541
memset(&to, 0, sizeof(to));
736
if(af == AF_INET6){
737
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
738
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
739
} else { /* IPv4 */
740
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
741
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
742
}
743
if(ret < 0 ){
744
int e = errno;
745
perror_plus("inet_pton");
746
errno = e;
747
goto mandos_end;
542
to.in6.sin6_family = AF_INET6;
543
/* It would be nice to have a way to detect if we were passed an
544
IPv4 address here. Now we assume an IPv6 address. */
545
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
546
if (ret < 0 ){
547
perror("inet_pton");
548
return -1;
748
549
}
749
550
if(ret == 0){
750
int e = errno;
751
fprintf_plus(stderr, "Bad address: %s\n", ip);
752
errno = e;
753
goto mandos_end;
754
}
755
if(af == AF_INET6){
756
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
757
if(IN6_IS_ADDR_LINKLOCAL
758
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
759
if(if_index == AVAHI_IF_UNSPEC){
760
fprintf_plus(stderr, "An IPv6 link-local address is"
761
" incomplete without a network interface\n");
762
errno = EINVAL;
763
goto mandos_end;
764
}
765
/* Set the network interface number as scope */
766
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
767
}
768
} else {
769
((struct sockaddr_in *)&to)->sin_port = htons(port);
770
}
551
fprintf(stderr, "Bad address: %s\n", ip);
552
return -1;
553
}
554
to.in6.sin6_port = htons(port); /* Spurious warning */
771
555
772
if(quit_now){
773
errno = EINTR;
774
goto mandos_end;
775
}
556
to.in6.sin6_scope_id = (uint32_t)if_index;
776
557
777
558
if(debug){
778
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
779
char interface[IF_NAMESIZE];
780
if(if_indextoname((unsigned int)if_index, interface) == NULL){
781
perror_plus("if_indextoname");
782
} else {
783
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
784
"\n", ip, interface, (uintmax_t)port);
559
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
560
port);
561
char addrstr[INET6_ADDRSTRLEN] = "";
562
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
563
sizeof(addrstr)) == NULL){
564
perror("inet_ntop");
565
} else {
566
if(strcmp(addrstr, ip) != 0){
567
fprintf(stderr, "Canonical address form: %s\n", addrstr);
785
568
}
786
} else {
787
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
788
ip, (uintmax_t)port);
789
}
790
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
791
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
792
if(af == AF_INET6){
793
ret = getnameinfo((struct sockaddr *)&to,
794
sizeof(struct sockaddr_in6),
795
addrstr, sizeof(addrstr), NULL, 0,
796
NI_NUMERICHOST);
797
} else {
798
ret = getnameinfo((struct sockaddr *)&to,
799
sizeof(struct sockaddr_in),
800
addrstr, sizeof(addrstr), NULL, 0,
801
NI_NUMERICHOST);
802
}
803
if(ret == EAI_SYSTEM){
804
perror_plus("getnameinfo");
805
} else if(ret != 0) {
806
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
807
} else if(strcmp(addrstr, ip) != 0){
808
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
809
}
810
}
811
812
if(quit_now){
813
errno = EINTR;
814
goto mandos_end;
815
}
816
817
if(af == AF_INET6){
818
ret = connect(tcp_sd, (struct sockaddr *)&to,
819
sizeof(struct sockaddr_in6));
820
} else {
821
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
822
sizeof(struct sockaddr_in));
823
}
824
if(ret < 0){
825
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
826
int e = errno;
827
perror_plus("connect");
828
errno = e;
829
}
830
goto mandos_end;
831
}
832
833
if(quit_now){
834
errno = EINTR;
835
goto mandos_end;
569
}
570
}
571
572
ret = connect(tcp_sd, &to.in, sizeof(to));
573
if (ret < 0){
574
perror("connect");
575
return -1;
836
576
}
837
577
838
578
const char *out = mandos_protocol_version;
839
579
written = 0;
840
while(true){
580
while (true){
841
581
size_t out_size = strlen(out);
842
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
843
out_size - written));
844
if(ret == -1){
845
int e = errno;
846
perror_plus("write");
847
errno = e;
582
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
583
out_size - written));
584
if (ret == -1){
585
perror("write");
586
retval = -1;
848
587
goto mandos_end;
849
588
}
850
589
written += (size_t)ret;
851
590
if(written < out_size){
852
591
continue;
853
592
} else {
854
if(out == mandos_protocol_version){
593
if (out == mandos_protocol_version){
855
594
written = 0;
856
595
out = "\r\n";
857
596
} else {
858
597
break;
859
598
}
860
599
}
861
862
if(quit_now){
863
errno = EINTR;
864
goto mandos_end;
865
}
866
600
}
867
601
868
602
if(debug){
869
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
870
}
871
872
if(quit_now){
873
errno = EINTR;
874
goto mandos_end;
875
}
876
877
/* This casting via intptr_t is to eliminate warning about casting
878
an int to a pointer type. This is exactly how the GnuTLS Guile
879
function "set-session-transport-fd!" does it. */
880
gnutls_transport_set_ptr(session,
881
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
882
883
if(quit_now){
884
errno = EINTR;
885
goto mandos_end;
886
}
887
888
do {
889
ret = gnutls_handshake(session);
890
if(quit_now){
891
errno = EINTR;
892
goto mandos_end;
893
}
603
fprintf(stderr, "Establishing TLS session with %s\n", ip);
604
}
605
606
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
607
608
do{
609
ret = gnutls_handshake (session);
894
610
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
895
611
896
if(ret != GNUTLS_E_SUCCESS){
612
if (ret != GNUTLS_E_SUCCESS){
897
613
if(debug){
898
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
899
gnutls_perror(ret);
614
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
615
gnutls_perror (ret);
900
616
}
901
errno = EPROTO;
617
retval = -1;
902
618
goto mandos_end;
903
619
}
904
620
905
621
/* Read OpenPGP packet that contains the wanted password */
906
622
907
623
if(debug){
908
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
909
" %s\n", ip);
624
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
625
ip);
910
626
}
911
627
912
628
while(true){
913
914
if(quit_now){
915
errno = EINTR;
916
goto mandos_end;
917
}
918
919
buffer_capacity = incbuffer(&buffer, buffer_length,
920
buffer_capacity);
921
if(buffer_capacity == 0){
922
int e = errno;
923
perror_plus("incbuffer");
924
errno = e;
925
goto mandos_end;
926
}
927
928
if(quit_now){
929
errno = EINTR;
930
goto mandos_end;
931
}
932
933
sret = gnutls_record_recv(session, buffer+buffer_length,
934
BUFFER_SIZE);
935
if(sret == 0){
629
buffer_capacity = adjustbuffer(&buffer, buffer_length,
630
buffer_capacity);
631
if (buffer_capacity == 0){
632
perror("adjustbuffer");
633
retval = -1;
634
goto mandos_end;
635
}
636
637
ret = gnutls_record_recv(session, buffer+buffer_length,
638
BUFFER_SIZE);
639
if (ret == 0){
936
640
break;
937
641
}
938
if(sret < 0){
939
switch(sret){
642
if (ret < 0){
643
switch(ret){
940
644
case GNUTLS_E_INTERRUPTED:
941
645
case GNUTLS_E_AGAIN:
942
646
break;
943
647
case GNUTLS_E_REHANDSHAKE:
944
do {
945
ret = gnutls_handshake(session);
946
947
if(quit_now){
948
errno = EINTR;
949
goto mandos_end;
950
}
648
do{
649
ret = gnutls_handshake (session);
951
650
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
952
if(ret < 0){
953
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
954
"***\n");
955
gnutls_perror(ret);
956
errno = EPROTO;
651
if (ret < 0){
652
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
653
gnutls_perror (ret);
654
retval = -1;
957
655
goto mandos_end;
958
656
}
959
657
break;
960
658
default:
961
fprintf_plus(stderr, "Unknown error while reading data from"
962
" encrypted session with Mandos server\n");
963
gnutls_bye(session, GNUTLS_SHUT_RDWR);
964
errno = EIO;
659
fprintf(stderr, "Unknown error while reading data from"
660
" encrypted session with Mandos server\n");
661
retval = -1;
662
gnutls_bye (session, GNUTLS_SHUT_RDWR);
965
663
goto mandos_end;
966
664
}
967
665
} else {
968
buffer_length += (size_t) sret;
666
buffer_length += (size_t) ret;
969
667
}
970
668
}
971
669
972
670
if(debug){
973
fprintf_plus(stderr, "Closing TLS session\n");
974
}
975
976
if(quit_now){
977
errno = EINTR;
978
goto mandos_end;
979
}
980
981
do {
982
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
983
if(quit_now){
984
errno = EINTR;
985
goto mandos_end;
986
}
987
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
988
989
if(buffer_length > 0){
990
ssize_t decrypted_buffer_size;
991
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
992
&decrypted_buffer, mc);
993
if(decrypted_buffer_size >= 0){
994
671
fprintf(stderr, "Closing TLS session\n");
672
}
673
674
gnutls_bye (session, GNUTLS_SHUT_RDWR);
675
676
if (buffer_length > 0){
677
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
678
buffer_length,
679
&decrypted_buffer);
680
if (decrypted_buffer_size >= 0){
995
681
written = 0;
996
682
while(written < (size_t) decrypted_buffer_size){
997
if(quit_now){
998
errno = EINTR;
999
goto mandos_end;
1000
}
1001
1002
ret = (int)fwrite(decrypted_buffer + written, 1,
1003
(size_t)decrypted_buffer_size - written,
1004
stdout);
683
ret = (int)fwrite (decrypted_buffer + written, 1,
684
(size_t)decrypted_buffer_size - written,
685
stdout);
1005
686
if(ret == 0 and ferror(stdout)){
1006
int e = errno;
1007
687
if(debug){
1008
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1009
strerror(errno));
688
fprintf(stderr, "Error writing encrypted data: %s\n",
689
strerror(errno));
1010
690
}
1011
errno = e;
1012
goto mandos_end;
691
retval = -1;
692
break;
1013
693
}
1014
694
written += (size_t)ret;
1015
695
}
1016
retval = 0;
696
free(decrypted_buffer);
697
} else {
698
retval = -1;
1017
699
}
700
} else {
701
retval = -1;
1018
702
}
1019
703
1020
704
/* Shutdown procedure */
1021
705
1022
706
mandos_end:
1023
{
1024
int e = errno;
1025
free(decrypted_buffer);
1026
free(buffer);
1027
if(tcp_sd >= 0){
1028
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1029
}
1030
if(ret == -1){
1031
if(e == 0){
1032
e = errno;
1033
}
1034
perror_plus("close");
1035
}
1036
gnutls_deinit(session);
1037
errno = e;
1038
if(quit_now){
1039
errno = EINTR;
1040
retval = -1;
1041
}
707
free(buffer);
708
ret = TEMP_FAILURE_RETRY(close(tcp_sd));
709
if(ret == -1){
710
perror("close");
1042
711
}
712
gnutls_deinit (session);
1043
713
return retval;
1044
714
}
1045
715
1046
__attribute__((nonnull))
1047
716
static void resolve_callback(AvahiSServiceResolver *r,
1048
717
AvahiIfIndex interface,
1049
AvahiProtocol proto,
718
AVAHI_GCC_UNUSED AvahiProtocol protocol,
1050
719
AvahiResolverEvent event,
1051
720
const char *name,
1052
721
const char *type,
1057
726
AVAHI_GCC_UNUSED AvahiStringList *txt,
1058
727
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1059
728
flags,
1060
void *mc){
1061
if(r == NULL){
1062
return;
1063
}
729
void* userdata) {
730
mandos_context *mc = userdata;
731
assert(r);
1064
732
1065
733
/* Called whenever a service has been resolved successfully or
1066
734
timed out */
1067
735
1068
if(quit_now){
1069
return;
1070
}
1071
1072
switch(event){
736
switch (event) {
1073
737
default:
1074
738
case AVAHI_RESOLVER_FAILURE:
1075
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1076
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1077
domain,
1078
avahi_strerror(avahi_server_errno
1079
(((mandos_context*)mc)->server)));
739
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
740
" of type '%s' in domain '%s': %s\n", name, type, domain,
741
avahi_strerror(avahi_server_errno(mc->server)));
1080
742
break;
1081
743
1082
744
case AVAHI_RESOLVER_FOUND:
1084
746
char ip[AVAHI_ADDRESS_STR_MAX];
1085
747
avahi_address_snprint(ip, sizeof(ip), address);
1086
748
if(debug){
1087
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1088
PRIdMAX ") on port %" PRIu16 "\n", name,
1089
host_name, ip, (intmax_t)interface, port);
749
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
750
PRIu16 ") on port %d\n", name, host_name, ip,
751
interface, port);
1090
752
}
1091
int ret = start_mandos_communication(ip, (in_port_t)port,
1092
interface,
1093
avahi_proto_to_af(proto),
1094
mc);
1095
if(ret == 0){
1096
avahi_simple_poll_quit(simple_poll);
1097
} else {
1098
if(not add_server(ip, (in_port_t)port, interface,
1099
avahi_proto_to_af(proto),
1100
&((mandos_context*)mc)->current_server)){
1101
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1102
" list\n", name);
1103
}
753
int ret = start_mandos_communication(ip, port, interface, mc);
754
if (ret == 0){
755
avahi_simple_poll_quit(mc->simple_poll);
1104
756
}
1105
757
}
1106
758
}
1107
759
avahi_s_service_resolver_free(r);
1108
760
}
1109
761
1110
static void browse_callback(AvahiSServiceBrowser *b,
1111
AvahiIfIndex interface,
1112
AvahiProtocol protocol,
1113
AvahiBrowserEvent event,
1114
const char *name,
1115
const char *type,
1116
const char *domain,
1117
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1118
flags,
1119
void *mc){
1120
if(b == NULL){
1121
return;
1122
}
762
static void browse_callback( AvahiSServiceBrowser *b,
763
AvahiIfIndex interface,
764
AvahiProtocol protocol,
765
AvahiBrowserEvent event,
766
const char *name,
767
const char *type,
768
const char *domain,
769
AVAHI_GCC_UNUSED AvahiLookupResultFlags
770
flags,
771
void* userdata) {
772
mandos_context *mc = userdata;
773
assert(b);
1123
774
1124
775
/* Called whenever a new services becomes available on the LAN or
1125
776
is removed from the LAN */
1126
777
1127
if(quit_now){
1128
return;
1129
}
1130
1131
switch(event){
778
switch (event) {
1132
779
default:
1133
780
case AVAHI_BROWSER_FAILURE:
1134
781
1135
fprintf_plus(stderr, "(Avahi browser) %s\n",
1136
avahi_strerror(avahi_server_errno
1137
(((mandos_context*)mc)->server)));
1138
avahi_simple_poll_quit(simple_poll);
782
fprintf(stderr, "(Avahi browser) %s\n",
783
avahi_strerror(avahi_server_errno(mc->server)));
784
avahi_simple_poll_quit(mc->simple_poll);
1139
785
return;
1140
786
1141
787
case AVAHI_BROWSER_NEW:
1144
790
the callback function is called the Avahi server will free the
1145
791
resolver for us. */
1146
792
1147
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1148
interface, protocol, name, type,
1149
domain, protocol, 0,
1150
resolve_callback, mc) == NULL)
1151
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1152
" %s\n", name,
1153
avahi_strerror(avahi_server_errno
1154
(((mandos_context*)mc)->server)));
793
if (!(avahi_s_service_resolver_new(mc->server, interface,
794
protocol, name, type, domain,
795
AVAHI_PROTO_INET6, 0,
796
resolve_callback, mc)))
797
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
798
name, avahi_strerror(avahi_server_errno(mc->server)));
1155
799
break;
1156
800
1157
801
case AVAHI_BROWSER_REMOVE:
1160
804
case AVAHI_BROWSER_ALL_FOR_NOW:
1161
805
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1162
806
if(debug){
1163
fprintf_plus(stderr, "No Mandos server found, still"
1164
" searching...\n");
807
fprintf(stderr, "No Mandos server found, still searching...\n");
1165
808
}
1166
809
break;
1167
810
}
1168
811
}
1169
812
1170
/* Signal handler that stops main loop after SIGTERM */
1171
static void handle_sigterm(int sig){
1172
if(quit_now){
1173
return;
1174
}
1175
quit_now = 1;
1176
signal_received = sig;
1177
int old_errno = errno;
1178
/* set main loop to exit */
1179
if(simple_poll != NULL){
1180
avahi_simple_poll_quit(simple_poll);
1181
}
1182
errno = old_errno;
1183
}
1184
1185
__attribute__((nonnull, warn_unused_result))
1186
bool get_flags(const char *ifname, struct ifreq *ifr){
1187
int ret;
1188
error_t ret_errno;
1189
1190
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1191
if(s < 0){
1192
ret_errno = errno;
1193
perror_plus("socket");
1194
errno = ret_errno;
1195
return false;
1196
}
1197
strcpy(ifr->ifr_name, ifname);
1198
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1199
if(ret == -1){
1200
if(debug){
1201
ret_errno = errno;
1202
perror_plus("ioctl SIOCGIFFLAGS");
1203
errno = ret_errno;
1204
}
1205
return false;
1206
}
1207
return true;
1208
}
1209
1210
__attribute__((nonnull, warn_unused_result))
1211
bool good_flags(const char *ifname, const struct ifreq *ifr){
1212
1213
/* Reject the loopback device */
1214
if(ifr->ifr_flags & IFF_LOOPBACK){
1215
if(debug){
1216
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1217
ifname);
1218
}
1219
return false;
1220
}
1221
/* Accept point-to-point devices only if connect_to is specified */
1222
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1223
if(debug){
1224
fprintf_plus(stderr, "Accepting point-to-point interface"
1225
" \"%s\"\n", ifname);
1226
}
1227
return true;
1228
}
1229
/* Otherwise, reject non-broadcast-capable devices */
1230
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1231
if(debug){
1232
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1233
" \"%s\"\n", ifname);
1234
}
1235
return false;
1236
}
1237
/* Reject non-ARP interfaces (including dummy interfaces) */
1238
if(ifr->ifr_flags & IFF_NOARP){
1239
if(debug){
1240
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1241
ifname);
1242
}
1243
return false;
1244
}
1245
1246
/* Accept this device */
1247
if(debug){
1248
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1249
}
1250
return true;
1251
}
1252
1253
/*
1254
* This function determines if a directory entry in /sys/class/net
1255
* corresponds to an acceptable network device.
1256
* (This function is passed to scandir(3) as a filter function.)
1257
*/
1258
__attribute__((nonnull, warn_unused_result))
1259
int good_interface(const struct dirent *if_entry){
1260
if(if_entry->d_name[0] == '.'){
1261
return 0;
1262
}
1263
1264
struct ifreq ifr;
1265
if(not get_flags(if_entry->d_name, &ifr)){
1266
if(debug){
1267
fprintf_plus(stderr, "Failed to get flags for interface "
1268
"\"%s\"\n", if_entry->d_name);
1269
}
1270
return 0;
1271
}
1272
1273
if(not good_flags(if_entry->d_name, &ifr)){
1274
return 0;
1275
}
1276
return 1;
1277
}
1278
1279
/*
1280
* This function determines if a network interface is up.
1281
*/
1282
__attribute__((nonnull, warn_unused_result))
1283
bool interface_is_up(const char *interface){
1284
struct ifreq ifr;
1285
if(not get_flags(interface, &ifr)){
1286
if(debug){
1287
fprintf_plus(stderr, "Failed to get flags for interface "
1288
"\"%s\"\n", interface);
1289
}
1290
return false;
1291
}
1292
1293
return (bool)(ifr.ifr_flags & IFF_UP);
1294
}
1295
1296
/*
1297
* This function determines if a network interface is running
1298
*/
1299
__attribute__((nonnull, warn_unused_result))
1300
bool interface_is_running(const char *interface){
1301
struct ifreq ifr;
1302
if(not get_flags(interface, &ifr)){
1303
if(debug){
1304
fprintf_plus(stderr, "Failed to get flags for interface "
1305
"\"%s\"\n", interface);
1306
}
1307
return false;
1308
}
1309
1310
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1311
}
1312
1313
__attribute__((nonnull, pure, warn_unused_result))
1314
int notdotentries(const struct dirent *direntry){
1315
/* Skip "." and ".." */
1316
if(direntry->d_name[0] == '.'
1317
and (direntry->d_name[1] == '\0'
1318
or (direntry->d_name[1] == '.'
1319
and direntry->d_name[2] == '\0'))){
1320
return 0;
1321
}
1322
return 1;
1323
}
1324
1325
/* Is this directory entry a runnable program? */
1326
__attribute__((nonnull, warn_unused_result))
1327
int runnable_hook(const struct dirent *direntry){
1328
int ret;
1329
size_t sret;
1330
struct stat st;
1331
1332
if((direntry->d_name)[0] == '\0'){
1333
/* Empty name? */
1334
return 0;
1335
}
1336
1337
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1338
"abcdefghijklmnopqrstuvwxyz"
1339
"0123456789"
1340
"_.-");
1341
if((direntry->d_name)[sret] != '\0'){
1342
/* Contains non-allowed characters */
1343
if(debug){
1344
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1345
direntry->d_name);
1346
}
1347
return 0;
1348
}
1349
1350
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1351
if(ret == -1){
1352
if(debug){
1353
perror_plus("Could not stat hook");
1354
}
1355
return 0;
1356
}
1357
if(not (S_ISREG(st.st_mode))){
1358
/* Not a regular file */
1359
if(debug){
1360
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1361
direntry->d_name);
1362
}
1363
return 0;
1364
}
1365
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1366
/* Not executable */
1367
if(debug){
1368
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1369
direntry->d_name);
1370
}
1371
return 0;
1372
}
1373
if(debug){
1374
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1375
direntry->d_name);
1376
}
1377
return 1;
1378
}
1379
1380
__attribute__((nonnull, warn_unused_result))
1381
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1382
mandos_context *mc){
1383
int ret;
1384
struct timespec now;
1385
struct timespec waited_time;
1386
intmax_t block_time;
1387
1388
while(true){
1389
if(mc->current_server == NULL){
1390
if(debug){
1391
fprintf_plus(stderr, "Wait until first server is found."
1392
" No timeout!\n");
1393
}
1394
ret = avahi_simple_poll_iterate(s, -1);
1395
} else {
1396
if(debug){
1397
fprintf_plus(stderr, "Check current_server if we should run"
1398
" it, or wait\n");
1399
}
1400
/* the current time */
1401
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1402
if(ret == -1){
1403
perror_plus("clock_gettime");
1404
return -1;
1405
}
1406
/* Calculating in ms how long time between now and server
1407
who we visted longest time ago. Now - last seen. */
1408
waited_time.tv_sec = (now.tv_sec
1409
- mc->current_server->last_seen.tv_sec);
1410
waited_time.tv_nsec = (now.tv_nsec
1411
- mc->current_server->last_seen.tv_nsec);
1412
/* total time is 10s/10,000ms.
1413
Converting to s from ms by dividing by 1,000,
1414
and ns to ms by dividing by 1,000,000. */
1415
block_time = ((retry_interval
1416
- ((intmax_t)waited_time.tv_sec * 1000))
1417
- ((intmax_t)waited_time.tv_nsec / 1000000));
1418
1419
if(debug){
1420
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1421
block_time);
1422
}
1423
1424
if(block_time <= 0){
1425
ret = start_mandos_communication(mc->current_server->ip,
1426
mc->current_server->port,
1427
mc->current_server->if_index,
1428
mc->current_server->af, mc);
1429
if(ret == 0){
1430
avahi_simple_poll_quit(s);
1431
return 0;
1432
}
1433
ret = clock_gettime(CLOCK_MONOTONIC,
1434
&mc->current_server->last_seen);
1435
if(ret == -1){
1436
perror_plus("clock_gettime");
1437
return -1;
1438
}
1439
mc->current_server = mc->current_server->next;
1440
block_time = 0; /* Call avahi to find new Mandos
1441
servers, but don't block */
1442
}
1443
1444
ret = avahi_simple_poll_iterate(s, (int)block_time);
1445
}
1446
if(ret != 0){
1447
if(ret > 0 or errno != EINTR){
1448
return (ret != 1) ? ret : 0;
1449
}
1450
}
1451
}
1452
}
1453
1454
/* Set effective uid to 0, return errno */
1455
__attribute__((warn_unused_result))
1456
error_t raise_privileges(void){
1457
error_t old_errno = errno;
1458
error_t ret_errno = 0;
1459
if(seteuid(0) == -1){
1460
ret_errno = errno;
1461
perror_plus("seteuid");
1462
}
1463
errno = old_errno;
1464
return ret_errno;
1465
}
1466
1467
/* Set effective and real user ID to 0. Return errno. */
1468
__attribute__((warn_unused_result))
1469
error_t raise_privileges_permanently(void){
1470
error_t old_errno = errno;
1471
error_t ret_errno = raise_privileges();
1472
if(ret_errno != 0){
1473
errno = old_errno;
1474
return ret_errno;
1475
}
1476
if(setuid(0) == -1){
1477
ret_errno = errno;
1478
perror_plus("seteuid");
1479
}
1480
errno = old_errno;
1481
return ret_errno;
1482
}
1483
1484
/* Set effective user ID to unprivileged saved user ID */
1485
__attribute__((warn_unused_result))
1486
error_t lower_privileges(void){
1487
error_t old_errno = errno;
1488
error_t ret_errno = 0;
1489
if(seteuid(uid) == -1){
1490
ret_errno = errno;
1491
perror_plus("seteuid");
1492
}
1493
errno = old_errno;
1494
return ret_errno;
1495
}
1496
1497
/* Lower privileges permanently */
1498
__attribute__((warn_unused_result))
1499
error_t lower_privileges_permanently(void){
1500
error_t old_errno = errno;
1501
error_t ret_errno = 0;
1502
if(setuid(uid) == -1){
1503
ret_errno = errno;
1504
perror_plus("setuid");
1505
}
1506
errno = old_errno;
1507
return ret_errno;
1508
}
1509
1510
__attribute__((nonnull))
1511
void run_network_hooks(const char *mode, const char *interface,
1512
const float delay){
1513
struct dirent **direntries = NULL;
1514
if(hookdir_fd == -1){
1515
hookdir_fd = open(hookdir, O_RDONLY);
1516
if(hookdir_fd == -1){
1517
if(errno == ENOENT){
1518
if(debug){
1519
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1520
" found\n", hookdir);
1521
}
1522
} else {
1523
perror_plus("open");
1524
}
1525
return;
1526
}
1527
}
1528
#ifdef __GLIBC__
1529
#if __GLIBC_PREREQ(2, 15)
1530
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1531
runnable_hook, alphasort);
1532
#else /* not __GLIBC_PREREQ(2, 15) */
1533
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1534
alphasort);
1535
#endif /* not __GLIBC_PREREQ(2, 15) */
1536
#else /* not __GLIBC__ */
1537
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1538
alphasort);
1539
#endif /* not __GLIBC__ */
1540
if(numhooks == -1){
1541
perror_plus("scandir");
1542
return;
1543
}
1544
struct dirent *direntry;
1545
int ret;
1546
int devnull = open("/dev/null", O_RDONLY);
1547
for(int i = 0; i < numhooks; i++){
1548
direntry = direntries[i];
1549
if(debug){
1550
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1551
direntry->d_name);
1552
}
1553
pid_t hook_pid = fork();
1554
if(hook_pid == 0){
1555
/* Child */
1556
/* Raise privileges */
1557
if(raise_privileges_permanently() != 0){
1558
perror_plus("Failed to raise privileges");
1559
_exit(EX_NOPERM);
1560
}
1561
/* Set group */
1562
errno = 0;
1563
ret = setgid(0);
1564
if(ret == -1){
1565
perror_plus("setgid");
1566
_exit(EX_NOPERM);
1567
}
1568
/* Reset supplementary groups */
1569
errno = 0;
1570
ret = setgroups(0, NULL);
1571
if(ret == -1){
1572
perror_plus("setgroups");
1573
_exit(EX_NOPERM);
1574
}
1575
ret = dup2(devnull, STDIN_FILENO);
1576
if(ret == -1){
1577
perror_plus("dup2(devnull, STDIN_FILENO)");
1578
_exit(EX_OSERR);
1579
}
1580
ret = close(devnull);
1581
if(ret == -1){
1582
perror_plus("close");
1583
_exit(EX_OSERR);
1584
}
1585
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1586
if(ret == -1){
1587
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1588
_exit(EX_OSERR);
1589
}
1590
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1591
if(ret == -1){
1592
perror_plus("setenv");
1593
_exit(EX_OSERR);
1594
}
1595
ret = setenv("DEVICE", interface, 1);
1596
if(ret == -1){
1597
perror_plus("setenv");
1598
_exit(EX_OSERR);
1599
}
1600
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1601
if(ret == -1){
1602
perror_plus("setenv");
1603
_exit(EX_OSERR);
1604
}
1605
ret = setenv("MODE", mode, 1);
1606
if(ret == -1){
1607
perror_plus("setenv");
1608
_exit(EX_OSERR);
1609
}
1610
char *delaystring;
1611
ret = asprintf(&delaystring, "%f", (double)delay);
1612
if(ret == -1){
1613
perror_plus("asprintf");
1614
_exit(EX_OSERR);
1615
}
1616
ret = setenv("DELAY", delaystring, 1);
1617
if(ret == -1){
1618
free(delaystring);
1619
perror_plus("setenv");
1620
_exit(EX_OSERR);
1621
}
1622
free(delaystring);
1623
if(connect_to != NULL){
1624
ret = setenv("CONNECT", connect_to, 1);
1625
if(ret == -1){
1626
perror_plus("setenv");
1627
_exit(EX_OSERR);
1628
}
1629
}
1630
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
1631
if(hook_fd == -1){
1632
perror_plus("openat");
1633
_exit(EXIT_FAILURE);
1634
}
1635
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1636
perror_plus("close");
1637
_exit(EXIT_FAILURE);
1638
}
1639
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1640
environ) == -1){
1641
perror_plus("fexecve");
1642
_exit(EXIT_FAILURE);
1643
}
1644
} else {
1645
int status;
1646
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1647
perror_plus("waitpid");
1648
continue;
1649
}
1650
if(WIFEXITED(status)){
1651
if(WEXITSTATUS(status) != 0){
1652
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1653
" with status %d\n", direntry->d_name,
1654
WEXITSTATUS(status));
1655
continue;
1656
}
1657
} else if(WIFSIGNALED(status)){
1658
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1659
" signal %d\n", direntry->d_name,
1660
WTERMSIG(status));
1661
continue;
1662
} else {
1663
fprintf_plus(stderr, "Warning: network hook \"%s\""
1664
" crashed\n", direntry->d_name);
1665
continue;
1666
}
1667
}
1668
if(debug){
1669
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1670
direntry->d_name);
1671
}
1672
}
1673
free(direntries);
1674
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1675
perror_plus("close");
1676
} else {
1677
hookdir_fd = -1;
1678
}
1679
close(devnull);
1680
}
1681
1682
__attribute__((nonnull, warn_unused_result))
1683
error_t bring_up_interface(const char *const interface,
1684
const float delay){
1685
error_t old_errno = errno;
1686
int ret;
1687
struct ifreq network;
1688
unsigned int if_index = if_nametoindex(interface);
1689
if(if_index == 0){
1690
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1691
errno = old_errno;
1692
return ENXIO;
1693
}
1694
1695
if(quit_now){
1696
errno = old_errno;
1697
return EINTR;
1698
}
1699
1700
if(not interface_is_up(interface)){
1701
error_t ret_errno = 0, ioctl_errno = 0;
1702
if(not get_flags(interface, &network)){
1703
ret_errno = errno;
1704
fprintf_plus(stderr, "Failed to get flags for interface "
1705
"\"%s\"\n", interface);
1706
errno = old_errno;
1707
return ret_errno;
1708
}
1709
network.ifr_flags |= IFF_UP; /* set flag */
1710
1711
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1712
if(sd == -1){
1713
ret_errno = errno;
1714
perror_plus("socket");
1715
errno = old_errno;
1716
return ret_errno;
1717
}
1718
1719
if(quit_now){
1720
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1721
if(ret == -1){
1722
perror_plus("close");
1723
}
1724
errno = old_errno;
1725
return EINTR;
1726
}
1727
1728
if(debug){
1729
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1730
interface);
1731
}
1732
1733
/* Raise privileges */
1734
ret_errno = raise_privileges();
1735
if(ret_errno != 0){
1736
perror_plus("Failed to raise privileges");
1737
}
1738
1739
#ifdef __linux__
1740
int ret_linux;
1741
bool restore_loglevel = false;
1742
if(ret_errno == 0){
1743
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1744
messages about the network interface to mess up the prompt */
1745
ret_linux = klogctl(8, NULL, 5);
1746
if(ret_linux == -1){
1747
perror_plus("klogctl");
1748
} else {
1749
restore_loglevel = true;
1750
}
1751
}
1752
#endif /* __linux__ */
1753
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1754
ioctl_errno = errno;
1755
#ifdef __linux__
1756
if(restore_loglevel){
1757
ret_linux = klogctl(7, NULL, 0);
1758
if(ret_linux == -1){
1759
perror_plus("klogctl");
1760
}
1761
}
1762
#endif /* __linux__ */
1763
1764
/* If raise_privileges() succeeded above */
1765
if(ret_errno == 0){
1766
/* Lower privileges */
1767
ret_errno = lower_privileges();
1768
if(ret_errno != 0){
1769
errno = ret_errno;
1770
perror_plus("Failed to lower privileges");
1771
}
1772
}
1773
1774
/* Close the socket */
1775
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1776
if(ret == -1){
1777
perror_plus("close");
1778
}
1779
1780
if(ret_setflags == -1){
1781
errno = ioctl_errno;
1782
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1783
errno = old_errno;
1784
return ioctl_errno;
1785
}
1786
} else if(debug){
1787
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1788
interface);
1789
}
1790
1791
/* Sleep checking until interface is running.
1792
Check every 0.25s, up to total time of delay */
1793
for(int i=0; i < delay * 4; i++){
1794
if(interface_is_running(interface)){
1795
break;
1796
}
1797
struct timespec sleeptime = { .tv_nsec = 250000000 };
1798
ret = nanosleep(&sleeptime, NULL);
1799
if(ret == -1 and errno != EINTR){
1800
perror_plus("nanosleep");
1801
}
1802
}
1803
1804
errno = old_errno;
1805
return 0;
1806
}
1807
1808
__attribute__((nonnull, warn_unused_result))
1809
error_t take_down_interface(const char *const interface){
1810
error_t old_errno = errno;
1811
struct ifreq network;
1812
unsigned int if_index = if_nametoindex(interface);
1813
if(if_index == 0){
1814
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1815
errno = old_errno;
1816
return ENXIO;
1817
}
1818
if(interface_is_up(interface)){
1819
error_t ret_errno = 0, ioctl_errno = 0;
1820
if(not get_flags(interface, &network) and debug){
1821
ret_errno = errno;
1822
fprintf_plus(stderr, "Failed to get flags for interface "
1823
"\"%s\"\n", interface);
1824
errno = old_errno;
1825
return ret_errno;
1826
}
1827
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1828
1829
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1830
if(sd == -1){
1831
ret_errno = errno;
1832
perror_plus("socket");
1833
errno = old_errno;
1834
return ret_errno;
1835
}
1836
1837
if(debug){
1838
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1839
interface);
1840
}
1841
1842
/* Raise privileges */
1843
ret_errno = raise_privileges();
1844
if(ret_errno != 0){
1845
perror_plus("Failed to raise privileges");
1846
}
1847
1848
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1849
ioctl_errno = errno;
1850
1851
/* If raise_privileges() succeeded above */
1852
if(ret_errno == 0){
1853
/* Lower privileges */
1854
ret_errno = lower_privileges();
1855
if(ret_errno != 0){
1856
errno = ret_errno;
1857
perror_plus("Failed to lower privileges");
1858
}
1859
}
1860
1861
/* Close the socket */
1862
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1863
if(ret == -1){
1864
perror_plus("close");
1865
}
1866
1867
if(ret_setflags == -1){
1868
errno = ioctl_errno;
1869
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1870
errno = old_errno;
1871
return ioctl_errno;
1872
}
1873
} else if(debug){
1874
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1875
interface);
1876
}
1877
1878
errno = old_errno;
1879
return 0;
1880
}
1881
1882
813
int main(int argc, char *argv[]){
1883
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1884
.priority = "SECURE256:!CTYPE-X.509:"
1885
"+CTYPE-OPENPGP", .current_server = NULL,
1886
.interfaces = NULL, .interfaces_size = 0 };
1887
AvahiSServiceBrowser *sb = NULL;
1888
error_t ret_errno;
1889
int ret;
1890
intmax_t tmpmax;
1891
char *tmp;
1892
int exitcode = EXIT_SUCCESS;
1893
char *interfaces_to_take_down = NULL;
1894
size_t interfaces_to_take_down_size = 0;
1895
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1896
char old_tempdir[] = "/tmp/mandosXXXXXX";
1897
char *tempdir = NULL;
1898
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1899
const char *seckey = PATHDIR "/" SECKEY;
1900
const char *pubkey = PATHDIR "/" PUBKEY;
1901
char *interfaces_hooks = NULL;
1902
1903
bool gnutls_initialized = false;
1904
bool gpgme_initialized = false;
1905
float delay = 2.5f;
1906
double retry_interval = 10; /* 10s between trying a server and
1907
retrying the same server again */
1908
1909
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1910
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1911
1912
uid = getuid();
1913
gid = getgid();
1914
1915
/* Lower any group privileges we might have, just to be safe */
1916
errno = 0;
1917
ret = setgid(gid);
1918
if(ret == -1){
1919
perror_plus("setgid");
1920
}
1921
1922
/* Lower user privileges (temporarily) */
1923
errno = 0;
1924
ret = seteuid(uid);
1925
if(ret == -1){
1926
perror_plus("seteuid");
1927
}
1928
1929
if(quit_now){
1930
goto end;
1931
}
1932
1933
{
1934
struct argp_option options[] = {
1935
{ .name = "debug", .key = 128,
1936
.doc = "Debug mode", .group = 3 },
1937
{ .name = "connect", .key = 'c',
1938
.arg = "ADDRESS:PORT",
1939
.doc = "Connect directly to a specific Mandos server",
1940
.group = 1 },
1941
{ .name = "interface", .key = 'i',
1942
.arg = "NAME",
1943
.doc = "Network interface that will be used to search for"
1944
" Mandos servers",
1945
.group = 1 },
1946
{ .name = "seckey", .key = 's',
1947
.arg = "FILE",
1948
.doc = "OpenPGP secret key file base name",
1949
.group = 1 },
1950
{ .name = "pubkey", .key = 'p',
1951
.arg = "FILE",
1952
.doc = "OpenPGP public key file base name",
1953
.group = 2 },
1954
{ .name = "dh-bits", .key = 129,
1955
.arg = "BITS",
1956
.doc = "Bit length of the prime number used in the"
1957
" Diffie-Hellman key exchange",
1958
.group = 2 },
1959
{ .name = "priority", .key = 130,
1960
.arg = "STRING",
1961
.doc = "GnuTLS priority string for the TLS handshake",
1962
.group = 1 },
1963
{ .name = "delay", .key = 131,
1964
.arg = "SECONDS",
1965
.doc = "Maximum delay to wait for interface startup",
1966
.group = 2 },
1967
{ .name = "retry", .key = 132,
1968
.arg = "SECONDS",
1969
.doc = "Retry interval used when denied by the Mandos server",
1970
.group = 2 },
1971
{ .name = "network-hook-dir", .key = 133,
1972
.arg = "DIR",
1973
.doc = "Directory where network hooks are located",
1974
.group = 2 },
1975
/*
1976
* These reproduce what we would get without ARGP_NO_HELP
1977
*/
1978
{ .name = "help", .key = '?',
1979
.doc = "Give this help list", .group = -1 },
1980
{ .name = "usage", .key = -3,
1981
.doc = "Give a short usage message", .group = -1 },
1982
{ .name = "version", .key = 'V',
1983
.doc = "Print program version", .group = -1 },
1984
{ .name = NULL }
1985
};
1986
1987
error_t parse_opt(int key, char *arg,
1988
struct argp_state *state){
814
AvahiSServiceBrowser *sb = NULL;
815
int error;
816
int ret;
817
int exitcode = EXIT_SUCCESS;
818
const char *interface = "eth0";
819
struct ifreq network;
820
int sd;
821
uid_t uid;
822
gid_t gid;
823
char *connect_to = NULL;
824
char tempdir[] = "/tmp/mandosXXXXXX";
825
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
826
const char *seckey = PATHDIR "/" SECKEY;
827
const char *pubkey = PATHDIR "/" PUBKEY;
828
829
mandos_context mc = { .simple_poll = NULL, .server = NULL,
830
.dh_bits = 1024, .priority = "SECURE256"
831
":!CTYPE-X.509:+CTYPE-OPENPGP" };
832
bool gnutls_initalized = false;
833
bool pgpme_initalized = false;
834
835
{
836
struct argp_option options[] = {
837
{ .name = "debug", .key = 128,
838
.doc = "Debug mode", .group = 3 },
839
{ .name = "connect", .key = 'c',
840
.arg = "ADDRESS:PORT",
841
.doc = "Connect directly to a specific Mandos server",
842
.group = 1 },
843
{ .name = "interface", .key = 'i',
844
.arg = "NAME",
845
.doc = "Interface that will be used to search for Mandos"
846
" servers",
847
.group = 1 },
848
{ .name = "seckey", .key = 's',
849
.arg = "FILE",
850
.doc = "OpenPGP secret key file base name",
851
.group = 1 },
852
{ .name = "pubkey", .key = 'p',
853
.arg = "FILE",
854
.doc = "OpenPGP public key file base name",
855
.group = 2 },
856
{ .name = "dh-bits", .key = 129,
857
.arg = "BITS",
858
.doc = "Bit length of the prime number used in the"
859
" Diffie-Hellman key exchange",
860
.group = 2 },
861
{ .name = "priority", .key = 130,
862
.arg = "STRING",
863
.doc = "GnuTLS priority string for the TLS handshake",
864
.group = 1 },
865
{ .name = NULL }
866
};
867
868
error_t parse_opt (int key, char *arg,
869
struct argp_state *state) {
870
/* Get the INPUT argument from `argp_parse', which we know is
871
a pointer to our plugin list pointer. */
872
switch (key) {
873
case 128: /* --debug */
874
debug = true;
875
break;
876
case 'c': /* --connect */
877
connect_to = arg;
878
break;
879
case 'i': /* --interface */
880
interface = arg;
881
break;
882
case 's': /* --seckey */
883
seckey = arg;
884
break;
885
case 'p': /* --pubkey */
886
pubkey = arg;
887
break;
888
case 129: /* --dh-bits */
889
errno = 0;
890
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
891
if (errno){
892
perror("strtol");
893
exit(EXIT_FAILURE);
894
}
895
break;
896
case 130: /* --priority */
897
mc.priority = arg;
898
break;
899
case ARGP_KEY_ARG:
900
argp_usage (state);
901
case ARGP_KEY_END:
902
break;
903
default:
904
return ARGP_ERR_UNKNOWN;
905
}
906
return 0;
907
}
908
909
struct argp argp = { .options = options, .parser = parse_opt,
910
.args_doc = "",
911
.doc = "Mandos client -- Get and decrypt"
912
" passwords from a Mandos server" };
913
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
914
if (ret == ARGP_ERR_UNKNOWN){
915
fprintf(stderr, "Unknown error while parsing arguments\n");
916
exitcode = EXIT_FAILURE;
917
goto end;
918
}
919
}
920
921
/* If the interface is down, bring it up */
922
{
923
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
924
if(sd < 0) {
925
perror("socket");
926
exitcode = EXIT_FAILURE;
927
goto end;
928
}
929
strcpy(network.ifr_name, interface);
930
ret = ioctl(sd, SIOCGIFFLAGS, &network);
931
if(ret == -1){
932
perror("ioctl SIOCGIFFLAGS");
933
exitcode = EXIT_FAILURE;
934
goto end;
935
}
936
if((network.ifr_flags & IFF_UP) == 0){
937
network.ifr_flags |= IFF_UP;
938
ret = ioctl(sd, SIOCSIFFLAGS, &network);
939
if(ret == -1){
940
perror("ioctl SIOCSIFFLAGS");
941
exitcode = EXIT_FAILURE;
942
goto end;
943
}
944
}
945
ret = TEMP_FAILURE_RETRY(close(sd));
946
if(ret == -1){
947
perror("close");
948
}
949
}
950
951
uid = getuid();
952
gid = getgid();
953
954
ret = setuid(uid);
955
if (ret == -1){
956
perror("setuid");
957
}
958
959
setgid(gid);
960
if (ret == -1){
961
perror("setgid");
962
}
963
964
ret = init_gnutls_global(&mc, pubkey, seckey);
965
if (ret == -1){
966
fprintf(stderr, "init_gnutls_global failed\n");
967
exitcode = EXIT_FAILURE;
968
goto end;
969
} else {
970
gnutls_initalized = true;
971
}
972
973
if(mkdtemp(tempdir) == NULL){
974
perror("mkdtemp");
975
tempdir[0] = '\0';
976
goto end;
977
}
978
979
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
980
fprintf(stderr, "pgpme_initalized failed\n");
981
exitcode = EXIT_FAILURE;
982
goto end;
983
} else {
984
pgpme_initalized = true;
985
}
986
987
if_index = (AvahiIfIndex) if_nametoindex(interface);
988
if(if_index == 0){
989
fprintf(stderr, "No such interface: \"%s\"\n", interface);
990
exit(EXIT_FAILURE);
991
}
992
993
if(connect_to != NULL){
994
/* Connect directly, do not use Zeroconf */
995
/* (Mainly meant for debugging) */
996
char *address = strrchr(connect_to, ':');
997
if(address == NULL){
998
fprintf(stderr, "No colon in address\n");
999
exitcode = EXIT_FAILURE;
1000
goto end;
1001
}
1989
1002
errno = 0;
1990
switch(key){
1991
case 128: /* --debug */
1992
debug = true;
1993
break;
1994
case 'c': /* --connect */
1995
connect_to = arg;
1996
break;
1997
case 'i': /* --interface */
1998
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1999
arg, (int)',');
2000
if(ret_errno != 0){
2001
argp_error(state, "%s", strerror(ret_errno));
2002
}
2003
break;
2004
case 's': /* --seckey */
2005
seckey = arg;
2006
break;
2007
case 'p': /* --pubkey */
2008
pubkey = arg;
2009
break;
2010
case 129: /* --dh-bits */
2011
errno = 0;
2012
tmpmax = strtoimax(arg, &tmp, 10);
2013
if(errno != 0 or tmp == arg or *tmp != '\0'
2014
or tmpmax != (typeof(mc.dh_bits))tmpmax){
2015
argp_error(state, "Bad number of DH bits");
2016
}
2017
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2018
break;
2019
case 130: /* --priority */
2020
mc.priority = arg;
2021
break;
2022
case 131: /* --delay */
2023
errno = 0;
2024
delay = strtof(arg, &tmp);
2025
if(errno != 0 or tmp == arg or *tmp != '\0'){
2026
argp_error(state, "Bad delay");
2027
}
2028
case 132: /* --retry */
2029
errno = 0;
2030
retry_interval = strtod(arg, &tmp);
2031
if(errno != 0 or tmp == arg or *tmp != '\0'
2032
or (retry_interval * 1000) > INT_MAX
2033
or retry_interval < 0){
2034
argp_error(state, "Bad retry interval");
2035
}
2036
break;
2037
case 133: /* --network-hook-dir */
2038
hookdir = arg;
2039
break;
2040
/*
2041
* These reproduce what we would get without ARGP_NO_HELP
2042
*/
2043
case '?': /* --help */
2044
argp_state_help(state, state->out_stream,
2045
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2046
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2047
case -3: /* --usage */
2048
argp_state_help(state, state->out_stream,
2049
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2050
case 'V': /* --version */
2051
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2052
exit(argp_err_exit_status);
2053
break;
2054
default:
2055
return ARGP_ERR_UNKNOWN;
2056
}
2057
return errno;
2058
}
2059
2060
struct argp argp = { .options = options, .parser = parse_opt,
2061
.args_doc = "",
2062
.doc = "Mandos client -- Get and decrypt"
2063
" passwords from a Mandos server" };
2064
ret = argp_parse(&argp, argc, argv,
2065
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2066
switch(ret){
2067
case 0:
2068
break;
2069
case ENOMEM:
2070
default:
2071
errno = ret;
2072
perror_plus("argp_parse");
2073
exitcode = EX_OSERR;
2074
goto end;
2075
case EINVAL:
2076
exitcode = EX_USAGE;
2077
goto end;
2078
}
2079
}
2080
2081
{
2082
/* Work around Debian bug #633582:
2083
<http://bugs.debian.org/633582> */
2084
2085
/* Re-raise privileges */
2086
ret_errno = raise_privileges();
2087
if(ret_errno != 0){
2088
errno = ret_errno;
2089
perror_plus("Failed to raise privileges");
2090
} else {
2091
struct stat st;
2092
2093
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2094
int seckey_fd = open(seckey, O_RDONLY);
2095
if(seckey_fd == -1){
2096
perror_plus("open");
2097
} else {
2098
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2099
if(ret == -1){
2100
perror_plus("fstat");
2101
} else {
2102
if(S_ISREG(st.st_mode)
2103
and st.st_uid == 0 and st.st_gid == 0){
2104
ret = fchown(seckey_fd, uid, gid);
2105
if(ret == -1){
2106
perror_plus("fchown");
2107
}
2108
}
2109
}
2110
TEMP_FAILURE_RETRY(close(seckey_fd));
2111
}
2112
}
2113
2114
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2115
int pubkey_fd = open(pubkey, O_RDONLY);
2116
if(pubkey_fd == -1){
2117
perror_plus("open");
2118
} else {
2119
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2120
if(ret == -1){
2121
perror_plus("fstat");
2122
} else {
2123
if(S_ISREG(st.st_mode)
2124
and st.st_uid == 0 and st.st_gid == 0){
2125
ret = fchown(pubkey_fd, uid, gid);
2126
if(ret == -1){
2127
perror_plus("fchown");
2128
}
2129
}
2130
}
2131
TEMP_FAILURE_RETRY(close(pubkey_fd));
2132
}
2133
}
2134
2135
/* Lower privileges */
2136
ret_errno = lower_privileges();
2137
if(ret_errno != 0){
2138
errno = ret_errno;
2139
perror_plus("Failed to lower privileges");
2140
}
2141
}
2142
}
2143
2144
/* Remove invalid interface names (except "none") */
2145
{
2146
char *interface = NULL;
2147
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2148
interface))){
2149
if(strcmp(interface, "none") != 0
2150
and if_nametoindex(interface) == 0){
2151
if(interface[0] != '\0'){
2152
fprintf_plus(stderr, "Not using nonexisting interface"
2153
" \"%s\"\n", interface);
2154
}
2155
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2156
interface = NULL;
2157
}
2158
}
2159
}
2160
2161
/* Run network hooks */
2162
{
2163
if(mc.interfaces != NULL){
2164
interfaces_hooks = malloc(mc.interfaces_size);
2165
if(interfaces_hooks == NULL){
2166
perror_plus("malloc");
1003
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
1004
if(errno){
1005
perror("Bad port number");
1006
exitcode = EXIT_FAILURE;
2167
1007
goto end;
2168
1008
}
2169
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2170
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2171
}
2172
run_network_hooks("start", interfaces_hooks != NULL ?
2173
interfaces_hooks : "", delay);
2174
}
2175
2176
if(not debug){
2177
avahi_set_log_function(empty_log);
2178
}
2179
2180
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2181
from the signal handler */
2182
/* Initialize the pseudo-RNG for Avahi */
2183
srand((unsigned int) time(NULL));
2184
simple_poll = avahi_simple_poll_new();
2185
if(simple_poll == NULL){
2186
fprintf_plus(stderr,
2187
"Avahi: Failed to create simple poll object.\n");
2188
exitcode = EX_UNAVAILABLE;
2189
goto end;
2190
}
2191
2192
sigemptyset(&sigterm_action.sa_mask);
2193
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2194
if(ret == -1){
2195
perror_plus("sigaddset");
2196
exitcode = EX_OSERR;
2197
goto end;
2198
}
2199
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2200
if(ret == -1){
2201
perror_plus("sigaddset");
2202
exitcode = EX_OSERR;
2203
goto end;
2204
}
2205
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2206
if(ret == -1){
2207
perror_plus("sigaddset");
2208
exitcode = EX_OSERR;
2209
goto end;
2210
}
2211
/* Need to check if the handler is SIG_IGN before handling:
2212
| [[info:libc:Initial Signal Actions]] |
2213
| [[info:libc:Basic Signal Handling]] |
2214
*/
2215
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2216
if(ret == -1){
2217
perror_plus("sigaction");
2218
return EX_OSERR;
2219
}
2220
if(old_sigterm_action.sa_handler != SIG_IGN){
2221
ret = sigaction(SIGINT, &sigterm_action, NULL);
2222
if(ret == -1){
2223
perror_plus("sigaction");
2224
exitcode = EX_OSERR;
2225
goto end;
2226
}
2227
}
2228
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2229
if(ret == -1){
2230
perror_plus("sigaction");
2231
return EX_OSERR;
2232
}
2233
if(old_sigterm_action.sa_handler != SIG_IGN){
2234
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2235
if(ret == -1){
2236
perror_plus("sigaction");
2237
exitcode = EX_OSERR;
2238
goto end;
2239
}
2240
}
2241
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2242
if(ret == -1){
2243
perror_plus("sigaction");
2244
return EX_OSERR;
2245
}
2246
if(old_sigterm_action.sa_handler != SIG_IGN){
2247
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2248
if(ret == -1){
2249
perror_plus("sigaction");
2250
exitcode = EX_OSERR;
2251
goto end;
2252
}
2253
}
2254
2255
/* If no interfaces were specified, make a list */
2256
if(mc.interfaces == NULL){
2257
struct dirent **direntries = NULL;
2258
/* Look for any good interfaces */
2259
ret = scandir(sys_class_net, &direntries, good_interface,
2260
alphasort);
2261
if(ret >= 1){
2262
/* Add all found interfaces to interfaces list */
2263
for(int i = 0; i < ret; ++i){
2264
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2265
direntries[i]->d_name);
2266
if(ret_errno != 0){
2267
errno = ret_errno;
2268
perror_plus("argz_add");
2269
continue;
2270
}
2271
if(debug){
2272
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2273
direntries[i]->d_name);
2274
}
2275
}
2276
free(direntries);
2277
} else {
2278
if(ret == 0){
2279
free(direntries);
2280
}
2281
fprintf_plus(stderr, "Could not find a network interface\n");
2282
exitcode = EXIT_FAILURE;
2283
goto end;
2284
}
2285
}
2286
2287
/* Bring up interfaces which are down, and remove any "none"s */
2288
{
2289
char *interface = NULL;
2290
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2291
interface))){
2292
/* If interface name is "none", stop bringing up interfaces.
2293
Also remove all instances of "none" from the list */
2294
if(strcmp(interface, "none") == 0){
2295
argz_delete(&mc.interfaces, &mc.interfaces_size,
2296
interface);
2297
interface = NULL;
2298
while((interface = argz_next(mc.interfaces,
2299
mc.interfaces_size, interface))){
2300
if(strcmp(interface, "none") == 0){
2301
argz_delete(&mc.interfaces, &mc.interfaces_size,
2302
interface);
2303
interface = NULL;
2304
}
2305
}
2306
break;
2307
}
2308
bool interface_was_up = interface_is_up(interface);
2309
errno = bring_up_interface(interface, delay);
2310
if(not interface_was_up){
2311
if(errno != 0){
2312
perror_plus("Failed to bring up interface");
2313
} else {
2314
errno = argz_add(&interfaces_to_take_down,
2315
&interfaces_to_take_down_size,
2316
interface);
2317
if(errno != 0){
2318
perror_plus("argz_add");
2319
}
2320
}
2321
}
2322
}
2323
if(debug and (interfaces_to_take_down == NULL)){
2324
fprintf_plus(stderr, "No interfaces were brought up\n");
2325
}
2326
}
2327
2328
/* If we only got one interface, explicitly use only that one */
2329
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2330
if(debug){
2331
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2332
mc.interfaces);
2333
}
2334
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2335
}
2336
2337
if(quit_now){
2338
goto end;
2339
}
2340
2341
ret = init_gnutls_global(pubkey, seckey, &mc);
2342
if(ret == -1){
2343
fprintf_plus(stderr, "init_gnutls_global failed\n");
2344
exitcode = EX_UNAVAILABLE;
2345
goto end;
2346
} else {
2347
gnutls_initialized = true;
2348
}
2349
2350
if(quit_now){
2351
goto end;
2352
}
2353
2354
/* Try /run/tmp before /tmp */
2355
tempdir = mkdtemp(run_tempdir);
2356
if(tempdir == NULL and errno == ENOENT){
2357
if(debug){
2358
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2359
run_tempdir, old_tempdir);
2360
}
2361
tempdir = mkdtemp(old_tempdir);
2362
}
2363
if(tempdir == NULL){
2364
perror_plus("mkdtemp");
2365
goto end;
2366
}
2367
2368
if(quit_now){
2369
goto end;
2370
}
2371
2372
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2373
fprintf_plus(stderr, "init_gpgme failed\n");
2374
exitcode = EX_UNAVAILABLE;
2375
goto end;
2376
} else {
2377
gpgme_initialized = true;
2378
}
2379
2380
if(quit_now){
2381
goto end;
2382
}
2383
2384
if(connect_to != NULL){
2385
/* Connect directly, do not use Zeroconf */
2386
/* (Mainly meant for debugging) */
2387
char *address = strrchr(connect_to, ':');
2388
2389
if(address == NULL){
2390
fprintf_plus(stderr, "No colon in address\n");
2391
exitcode = EX_USAGE;
2392
goto end;
2393
}
2394
2395
if(quit_now){
2396
goto end;
2397
}
2398
2399
in_port_t port;
2400
errno = 0;
2401
tmpmax = strtoimax(address+1, &tmp, 10);
2402
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2403
or tmpmax != (in_port_t)tmpmax){
2404
fprintf_plus(stderr, "Bad port number\n");
2405
exitcode = EX_USAGE;
2406
goto end;
2407
}
2408
2409
if(quit_now){
2410
goto end;
2411
}
2412
2413
port = (in_port_t)tmpmax;
2414
*address = '\0';
2415
/* Colon in address indicates IPv6 */
2416
int af;
2417
if(strchr(connect_to, ':') != NULL){
2418
af = AF_INET6;
2419
/* Accept [] around IPv6 address - see RFC 5952 */
2420
if(connect_to[0] == '[' and address[-1] == ']')
2421
{
2422
connect_to++;
2423
address[-1] = '\0';
2424
}
2425
} else {
2426
af = AF_INET;
2427
}
2428
address = connect_to;
2429
2430
if(quit_now){
2431
goto end;
2432
}
2433
2434
while(not quit_now){
2435
ret = start_mandos_communication(address, port, if_index, af,
2436
&mc);
2437
if(quit_now or ret == 0){
2438
break;
2439
}
2440
if(debug){
2441
fprintf_plus(stderr, "Retrying in %d seconds\n",
2442
(int)retry_interval);
2443
}
2444
sleep((unsigned int)retry_interval);
2445
}
2446
2447
if(not quit_now){
2448
exitcode = EXIT_SUCCESS;
2449
}
2450
2451
goto end;
2452
}
2453
2454
if(quit_now){
2455
goto end;
2456
}
2457
2458
{
2459
AvahiServerConfig config;
2460
/* Do not publish any local Zeroconf records */
2461
avahi_server_config_init(&config);
2462
config.publish_hinfo = 0;
2463
config.publish_addresses = 0;
2464
config.publish_workstation = 0;
2465
config.publish_domain = 0;
2466
2467
/* Allocate a new server */
2468
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2469
&config, NULL, NULL, &ret_errno);
2470
2471
/* Free the Avahi configuration data */
2472
avahi_server_config_free(&config);
2473
}
2474
2475
/* Check if creating the Avahi server object succeeded */
2476
if(mc.server == NULL){
2477
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2478
avahi_strerror(ret_errno));
2479
exitcode = EX_UNAVAILABLE;
2480
goto end;
2481
}
2482
2483
if(quit_now){
2484
goto end;
2485
}
2486
2487
/* Create the Avahi service browser */
2488
sb = avahi_s_service_browser_new(mc.server, if_index,
2489
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2490
NULL, 0, browse_callback,
2491
(void *)&mc);
2492
if(sb == NULL){
2493
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2494
avahi_strerror(avahi_server_errno(mc.server)));
2495
exitcode = EX_UNAVAILABLE;
2496
goto end;
2497
}
2498
2499
if(quit_now){
2500
goto end;
2501
}
2502
2503
/* Run the main loop */
2504
2505
if(debug){
2506
fprintf_plus(stderr, "Starting Avahi loop search\n");
2507
}
2508
2509
ret = avahi_loop_with_timeout(simple_poll,
2510
(int)(retry_interval * 1000), &mc);
2511
if(debug){
2512
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2513
(ret == 0) ? "successfully" : "with error");
2514
}
2515
1009
*address = '\0';
1010
address = connect_to;
1011
ret = start_mandos_communication(address, port, if_index, &mc);
1012
if(ret < 0){
1013
exitcode = EXIT_FAILURE;
1014
} else {
1015
exitcode = EXIT_SUCCESS;
1016
}
1017
goto end;
1018
}
1019
1020
if (not debug){
1021
avahi_set_log_function(empty_log);
1022
}
1023
1024
/* Initialize the pseudo-RNG for Avahi */
1025
srand((unsigned int) time(NULL));
1026
1027
/* Allocate main Avahi loop object */
1028
mc.simple_poll = avahi_simple_poll_new();
1029
if (mc.simple_poll == NULL) {
1030
fprintf(stderr, "Avahi: Failed to create simple poll"
1031
" object.\n");
1032
exitcode = EXIT_FAILURE;
1033
goto end;
1034
}
1035
1036
{
1037
AvahiServerConfig config;
1038
/* Do not publish any local Zeroconf records */
1039
avahi_server_config_init(&config);
1040
config.publish_hinfo = 0;
1041
config.publish_addresses = 0;
1042
config.publish_workstation = 0;
1043
config.publish_domain = 0;
1044
1045
/* Allocate a new server */
1046
mc.server = avahi_server_new(avahi_simple_poll_get
1047
(mc.simple_poll), &config, NULL,
1048
NULL, &error);
1049
1050
/* Free the Avahi configuration data */
1051
avahi_server_config_free(&config);
1052
}
1053
1054
/* Check if creating the Avahi server object succeeded */
1055
if (mc.server == NULL) {
1056
fprintf(stderr, "Failed to create Avahi server: %s\n",
1057
avahi_strerror(error));
1058
exitcode = EXIT_FAILURE;
1059
goto end;
1060
}
1061
1062
/* Create the Avahi service browser */
1063
sb = avahi_s_service_browser_new(mc.server, if_index,
1064
AVAHI_PROTO_INET6,
1065
"_mandos._tcp", NULL, 0,
1066
browse_callback, &mc);
1067
if (sb == NULL) {
1068
fprintf(stderr, "Failed to create service browser: %s\n",
1069
avahi_strerror(avahi_server_errno(mc.server)));
1070
exitcode = EXIT_FAILURE;
1071
goto end;
1072
}
1073
1074
/* Run the main loop */
1075
1076
if (debug){
1077
fprintf(stderr, "Starting Avahi loop search\n");
1078
}
1079
1080
avahi_simple_poll_loop(mc.simple_poll);
1081
2516
1082
end:
2517
2518
if(debug){
2519
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2520
}
2521
2522
/* Cleanup things */
2523
free(mc.interfaces);
2524
2525
if(sb != NULL)
2526
avahi_s_service_browser_free(sb);
2527
2528
if(mc.server != NULL)
2529
avahi_server_free(mc.server);
2530
2531
if(simple_poll != NULL)
2532
avahi_simple_poll_free(simple_poll);
2533
2534
if(gnutls_initialized){
2535
gnutls_certificate_free_credentials(mc.cred);
2536
gnutls_global_deinit();
2537
gnutls_dh_params_deinit(mc.dh_params);
2538
}
2539
2540
if(gpgme_initialized){
2541
gpgme_release(mc.ctx);
2542
}
2543
2544
/* Cleans up the circular linked list of Mandos servers the client
2545
has seen */
2546
if(mc.current_server != NULL){
2547
mc.current_server->prev->next = NULL;
2548
while(mc.current_server != NULL){
2549
server *next = mc.current_server->next;
2550
free(mc.current_server);
2551
mc.current_server = next;
2552
}
2553
}
2554
2555
/* Re-raise privileges */
2556
{
2557
ret_errno = raise_privileges();
2558
if(ret_errno != 0){
2559
perror_plus("Failed to raise privileges");
2560
} else {
2561
2562
/* Run network hooks */
2563
run_network_hooks("stop", interfaces_hooks != NULL ?
2564
interfaces_hooks : "", delay);
2565
2566
/* Take down the network interfaces which were brought up */
2567
{
2568
char *interface = NULL;
2569
while((interface=argz_next(interfaces_to_take_down,
2570
interfaces_to_take_down_size,
2571
interface))){
2572
ret_errno = take_down_interface(interface);
2573
if(ret_errno != 0){
2574
errno = ret_errno;
2575
perror_plus("Failed to take down interface");
2576
}
2577
}
2578
if(debug and (interfaces_to_take_down == NULL)){
2579
fprintf_plus(stderr, "No interfaces needed to be taken"
2580
" down\n");
2581
}
2582
}
2583
}
2584
2585
ret_errno = lower_privileges_permanently();
2586
if(ret_errno != 0){
2587
perror_plus("Failed to lower privileges permanently");
2588
}
2589
}
2590
2591
free(interfaces_to_take_down);
2592
free(interfaces_hooks);
2593
2594
/* Removes the GPGME temp directory and all files inside */
2595
if(tempdir != NULL){
2596
struct dirent **direntries = NULL;
2597
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2598
O_NOFOLLOW));
2599
if(tempdir_fd == -1){
2600
perror_plus("open");
2601
} else {
2602
#ifdef __GLIBC__
2603
#if __GLIBC_PREREQ(2, 15)
2604
int numentries = scandirat(tempdir_fd, ".", &direntries,
2605
notdotentries, alphasort);
2606
#else /* not __GLIBC_PREREQ(2, 15) */
2607
int numentries = scandir(tempdir, &direntries, notdotentries,
2608
alphasort);
2609
#endif /* not __GLIBC_PREREQ(2, 15) */
2610
#else /* not __GLIBC__ */
2611
int numentries = scandir(tempdir, &direntries, notdotentries,
2612
alphasort);
2613
#endif /* not __GLIBC__ */
2614
if(numentries >= 0){
2615
for(int i = 0; i < numentries; i++){
2616
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2617
if(ret == -1){
2618
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2619
" \"%s\", 0): %s\n", tempdir,
2620
direntries[i]->d_name, strerror(errno));
2621
}
2622
}
2623
2624
/* need to clean even if 0 because man page doesn't specify */
2625
free(direntries);
2626
if(numentries == -1){
2627
perror_plus("scandir");
2628
}
2629
ret = rmdir(tempdir);
2630
if(ret == -1 and errno != ENOENT){
2631
perror_plus("rmdir");
2632
}
2633
}
2634
TEMP_FAILURE_RETRY(close(tempdir_fd));
2635
}
2636
}
2637
2638
if(quit_now){
2639
sigemptyset(&old_sigterm_action.sa_mask);
2640
old_sigterm_action.sa_handler = SIG_DFL;
2641
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2642
&old_sigterm_action,
2643
NULL));
2644
if(ret == -1){
2645
perror_plus("sigaction");
2646
}
2647
do {
2648
ret = raise(signal_received);
2649
} while(ret != 0 and errno == EINTR);
2650
if(ret != 0){
2651
perror_plus("raise");
2652
abort();
2653
}
2654
TEMP_FAILURE_RETRY(pause());
2655
}
2656
2657
return exitcode;
1083
1084
if (debug){
1085
fprintf(stderr, "%s exiting\n", argv[0]);
1086
}
1087
1088
/* Cleanup things */
1089
if (sb != NULL)
1090
avahi_s_service_browser_free(sb);
1091
1092
if (mc.server != NULL)
1093
avahi_server_free(mc.server);
1094
1095
if (mc.simple_poll != NULL)
1096
avahi_simple_poll_free(mc.simple_poll);
1097
1098
if (gnutls_initalized){
1099
gnutls_certificate_free_credentials(mc.cred);
1100
gnutls_global_deinit ();
1101
}
1102
1103
if(pgpme_initalized){
1104
gpgme_release(mc.ctx);
1105
}
1106
1107
/* Removes the temp directory used by GPGME */
1108
if(tempdir[0] != '\0'){
1109
DIR *d;
1110
struct dirent *direntry;
1111
d = opendir(tempdir);
1112
if(d == NULL){
1113
perror("opendir");
1114
} else {
1115
while(true){
1116
direntry = readdir(d);
1117
if(direntry == NULL){
1118
break;
1119
}
1120
if (direntry->d_type == DT_REG){
1121
char *fullname = NULL;
1122
ret = asprintf(&fullname, "%s/%s", tempdir,
1123
direntry->d_name);
1124
if(ret < 0){
1125
perror("asprintf");
1126
continue;
1127
}
1128
ret = unlink(fullname);
1129
if(ret == -1){
1130
fprintf(stderr, "unlink(\"%s\"): %s",
1131
fullname, strerror(errno));
1132
}
1133
free(fullname);
1134
}
1135
}
1136
}
1137
ret = rmdir(tempdir);
1138
if(ret == -1){
1139
perror("rmdir");
1140
}
1141
}
1142
1143
return exitcode;
2658
1144
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0