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- Committer: Teddy Hogeborn
- Date: 2008-09-06 17:24:58 UTC
- Revision ID: teddy@fukt.bsnet.se-20080906172458-2x5wlfkn7oqckt1y
* legalnotice.xml: Copy DocBook 4.4-formatted text from
<http://www.gnu.org/licenses/gpl-3.0.dbk>.
<http://www.gnu.org/licenses/gpl-3.0.dbk>.
- files added:
- etc-plugins.d-README
- files removed:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- debian/upstream
- network-hooks.d
- plugin-helpers
- 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 © 2008-2016 Teddy Hogeborn
13
* Copyright © 2008-2016 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 */
49
#include <string.h> /* strcmp(), strlen(), strerror(),
50
asprintf(), strncpy() */
51
#include <sys/ioctl.h> /* ioctl */
41
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
42
srand() */
43
#include <stdbool.h> /* bool, true */
44
#include <string.h> /* memset(), strcmp(), strlen(),
45
strerror(), asprintf(), strcpy() */
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
free(new_server);
238
return false;
239
}
240
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
241
if(ret == -1){
242
perror_plus("clock_gettime");
243
#ifdef __GNUC__
244
#pragma GCC diagnostic push
245
#pragma GCC diagnostic ignored "-Wcast-qual"
246
#endif
247
free((char *)(new_server->ip));
248
#ifdef __GNUC__
249
#pragma GCC diagnostic pop
250
#endif
251
free(new_server);
252
return false;
253
}
254
/* Special case of first server */
255
if(*current_server == NULL){
256
new_server->next = new_server;
257
new_server->prev = new_server;
258
*current_server = new_server;
259
} else {
260
/* Place the new server last in the list */
261
new_server->next = *current_server;
262
new_server->prev = (*current_server)->prev;
263
new_server->prev->next = new_server;
264
(*current_server)->prev = new_server;
265
}
266
return true;
267
}
268
269
145
/*
270
146
* Initialize GPGME.
271
147
*/
272
__attribute__((nonnull, warn_unused_result))
273
static bool init_gpgme(const char * const seckey,
274
const char * const pubkey,
275
const char * const tempdir,
276
mandos_context *mc){
148
static bool init_gpgme(mandos_context *mc, const char *seckey,
149
const char *pubkey, const char *tempdir){
150
int ret;
277
151
gpgme_error_t rc;
278
152
gpgme_engine_info_t engine_info;
279
153
154
280
155
/*
281
* Helper function to insert pub and seckey to the engine keyring.
156
* Helper function to insert pub and seckey to the enigne keyring.
282
157
*/
283
bool import_key(const char * const filename){
284
int ret;
158
bool import_key(const char *filename){
285
159
int fd;
286
160
gpgme_data_t pgp_data;
287
161
288
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
162
fd = TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
289
163
if(fd == -1){
290
perror_plus("open");
164
perror("open");
291
165
return false;
292
166
}
293
167
294
168
rc = gpgme_data_new_from_fd(&pgp_data, fd);
295
if(rc != GPG_ERR_NO_ERROR){
296
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
297
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));
298
172
return false;
299
173
}
300
174
301
175
rc = gpgme_op_import(mc->ctx, pgp_data);
302
if(rc != GPG_ERR_NO_ERROR){
303
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
304
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));
305
179
return false;
306
180
}
307
181
308
ret = close(fd);
182
ret = TEMP_FAILURE_RETRY(close(fd));
309
183
if(ret == -1){
310
perror_plus("close");
184
perror("close");
311
185
}
312
186
gpgme_data_release(pgp_data);
313
187
return true;
314
188
}
315
189
316
if(debug){
317
fprintf_plus(stderr, "Initializing GPGME\n");
190
if (debug){
191
fprintf(stderr, "Initialize gpgme\n");
318
192
}
319
193
320
194
/* Init GPGME */
321
195
gpgme_check_version(NULL);
322
196
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
323
if(rc != GPG_ERR_NO_ERROR){
324
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
325
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));
326
200
return false;
327
201
}
328
202
329
/* Set GPGME home directory for the OpenPGP engine only */
330
rc = gpgme_get_engine_info(&engine_info);
331
if(rc != GPG_ERR_NO_ERROR){
332
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
333
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));
334
208
return false;
335
209
}
336
210
while(engine_info != NULL){
342
216
engine_info = engine_info->next;
343
217
}
344
218
if(engine_info == NULL){
345
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
346
tempdir);
219
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
347
220
return false;
348
221
}
349
222
350
223
/* Create new GPGME "context" */
351
224
rc = gpgme_new(&(mc->ctx));
352
if(rc != GPG_ERR_NO_ERROR){
353
fprintf_plus(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
355
gpgme_strerror(rc));
356
return false;
357
}
358
359
if(not import_key(pubkey) or not import_key(seckey)){
360
return false;
361
}
362
363
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;
364
236
}
365
237
366
238
/*
367
239
* Decrypt OpenPGP data.
368
240
* Returns -1 on error
369
241
*/
370
__attribute__((nonnull, warn_unused_result))
371
static ssize_t pgp_packet_decrypt(const char *cryptotext,
372
size_t crypto_size,
373
char **plaintext,
374
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){
375
246
gpgme_data_t dh_crypto, dh_plain;
376
247
gpgme_error_t rc;
377
248
ssize_t ret;
378
249
size_t plaintext_capacity = 0;
379
250
ssize_t plaintext_length = 0;
380
251
381
if(debug){
382
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
252
if (debug){
253
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
383
254
}
384
255
385
256
/* Create new GPGME data buffer from memory cryptotext */
386
257
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
387
258
0);
388
if(rc != GPG_ERR_NO_ERROR){
389
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
390
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));
391
262
return -1;
392
263
}
393
264
394
265
/* Create new empty GPGME data buffer for the plaintext */
395
266
rc = gpgme_data_new(&dh_plain);
396
if(rc != GPG_ERR_NO_ERROR){
397
fprintf_plus(stderr, "Mandos plugin mandos-client: "
398
"bad gpgme_data_new: %s: %s\n",
399
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));
400
270
gpgme_data_release(dh_crypto);
401
271
return -1;
402
272
}
404
274
/* Decrypt data from the cryptotext data buffer to the plaintext
405
275
data buffer */
406
276
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
407
if(rc != GPG_ERR_NO_ERROR){
408
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
409
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));
410
280
plaintext_length = -1;
411
if(debug){
281
if (debug){
412
282
gpgme_decrypt_result_t result;
413
283
result = gpgme_op_decrypt_result(mc->ctx);
414
if(result == NULL){
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
284
if (result == NULL){
285
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
416
286
} else {
417
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
418
result->unsupported_algorithm);
419
fprintf_plus(stderr, "Wrong key usage: %u\n",
420
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);
421
291
if(result->file_name != NULL){
422
fprintf_plus(stderr, "File name: %s\n", result->file_name);
292
fprintf(stderr, "File name: %s\n", result->file_name);
423
293
}
424
294
gpgme_recipient_t recipient;
425
295
recipient = result->recipients;
426
while(recipient != NULL){
427
fprintf_plus(stderr, "Public key algorithm: %s\n",
428
gpgme_pubkey_algo_name
429
(recipient->pubkey_algo));
430
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
431
fprintf_plus(stderr, "Secret key available: %s\n",
432
recipient->status == GPG_ERR_NO_SECKEY
433
? "No" : "Yes");
434
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
}
435
306
}
436
307
}
437
308
}
439
310
}
440
311
441
312
if(debug){
442
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
313
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
443
314
}
444
315
445
316
/* Seek back to the beginning of the GPGME plaintext data buffer */
446
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
447
perror_plus("gpgme_data_seek");
317
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
318
perror("pgpme_data_seek");
448
319
plaintext_length = -1;
449
320
goto decrypt_end;
450
321
}
451
322
452
323
*plaintext = NULL;
453
324
while(true){
454
plaintext_capacity = incbuffer(plaintext,
455
(size_t)plaintext_length,
456
plaintext_capacity);
457
if(plaintext_capacity == 0){
458
perror_plus("incbuffer");
459
plaintext_length = -1;
460
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;
461
332
}
462
333
463
334
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
464
335
BUFFER_SIZE);
465
336
/* Print the data, if any */
466
if(ret == 0){
337
if (ret == 0){
467
338
/* EOF */
468
339
break;
469
340
}
470
341
if(ret < 0){
471
perror_plus("gpgme_data_read");
342
perror("gpgme_data_read");
472
343
plaintext_length = -1;
473
344
goto decrypt_end;
474
345
}
476
347
}
477
348
478
349
if(debug){
479
fprintf_plus(stderr, "Decrypted password is: ");
350
fprintf(stderr, "Decrypted password is: ");
480
351
for(ssize_t i = 0; i < plaintext_length; i++){
481
352
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
482
353
}
493
364
return plaintext_length;
494
365
}
495
366
496
__attribute__((warn_unused_result, const))
497
static const char *safe_string(const char *str){
498
if(str == NULL)
499
return "(unknown)";
500
return str;
501
}
502
503
__attribute__((warn_unused_result))
504
static const char *safer_gnutls_strerror(int value){
505
const char *ret = gnutls_strerror(value);
506
return safe_string(ret);
367
static const char * safer_gnutls_strerror (int value) {
368
const char *ret = gnutls_strerror (value); /* Spurious warning */
369
if (ret == NULL)
370
ret = "(unknown)";
371
return ret;
507
372
}
508
373
509
374
/* GnuTLS log function callback */
510
__attribute__((nonnull))
511
375
static void debuggnutls(__attribute__((unused)) int level,
512
376
const char* string){
513
fprintf_plus(stderr, "GnuTLS: %s", string);
377
fprintf(stderr, "GnuTLS: %s", string);
514
378
}
515
379
516
__attribute__((nonnull(1, 2, 4), warn_unused_result))
517
static int init_gnutls_global(const char *pubkeyfilename,
518
const char *seckeyfilename,
519
const char *dhparamsfilename,
520
mandos_context *mc){
380
static int init_gnutls_global(mandos_context *mc,
381
const char *pubkeyfilename,
382
const char *seckeyfilename){
521
383
int ret;
522
unsigned int uret;
523
524
if(debug){
525
fprintf_plus(stderr, "Initializing GnuTLS\n");
526
}
527
528
if(debug){
384
385
if(debug){
386
fprintf(stderr, "Initializing GnuTLS\n");
387
}
388
389
ret = gnutls_global_init();
390
if (ret != GNUTLS_E_SUCCESS) {
391
fprintf (stderr, "GnuTLS global_init: %s\n",
392
safer_gnutls_strerror(ret));
393
return -1;
394
}
395
396
if (debug){
529
397
/* "Use a log level over 10 to enable all debugging options."
530
398
* - GnuTLS manual
531
399
*/
534
402
}
535
403
536
404
/* OpenPGP credentials */
537
ret = gnutls_certificate_allocate_credentials(&mc->cred);
538
if(ret != GNUTLS_E_SUCCESS){
539
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
540
safer_gnutls_strerror(ret));
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 ();
541
411
return -1;
542
412
}
543
413
544
414
if(debug){
545
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
546
" secret key %s as GnuTLS credentials\n",
547
pubkeyfilename,
548
seckeyfilename);
415
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
416
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
417
seckeyfilename);
549
418
}
550
419
551
420
ret = gnutls_certificate_set_openpgp_key_file
552
421
(mc->cred, pubkeyfilename, seckeyfilename,
553
422
GNUTLS_OPENPGP_FMT_BASE64);
554
if(ret != GNUTLS_E_SUCCESS){
555
fprintf_plus(stderr,
556
"Error[%d] while reading the OpenPGP key pair ('%s',"
557
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
558
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
559
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));
560
429
goto globalfail;
561
430
}
562
431
563
432
/* GnuTLS server initialization */
564
433
ret = gnutls_dh_params_init(&mc->dh_params);
565
if(ret != GNUTLS_E_SUCCESS){
566
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
567
" initialization: %s\n",
568
safer_gnutls_strerror(ret));
569
goto globalfail;
570
}
571
/* If a Diffie-Hellman parameters file was given, try to use it */
572
if(dhparamsfilename != NULL){
573
gnutls_datum_t params = { .data = NULL, .size = 0 };
574
do {
575
int dhpfile = open(dhparamsfilename, O_RDONLY);
576
if(dhpfile == -1){
577
perror_plus("open");
578
dhparamsfilename = NULL;
579
break;
580
}
581
size_t params_capacity = 0;
582
while(true){
583
params_capacity = incbuffer((char **)¶ms.data,
584
(size_t)params.size,
585
(size_t)params_capacity);
586
if(params_capacity == 0){
587
perror_plus("incbuffer");
588
free(params.data);
589
params.data = NULL;
590
dhparamsfilename = NULL;
591
break;
592
}
593
ssize_t bytes_read = read(dhpfile,
594
params.data + params.size,
595
BUFFER_SIZE);
596
/* EOF */
597
if(bytes_read == 0){
598
break;
599
}
600
/* check bytes_read for failure */
601
if(bytes_read < 0){
602
perror_plus("read");
603
free(params.data);
604
params.data = NULL;
605
dhparamsfilename = NULL;
606
break;
607
}
608
params.size += (unsigned int)bytes_read;
609
}
610
if(params.data == NULL){
611
dhparamsfilename = NULL;
612
}
613
if(dhparamsfilename == NULL){
614
break;
615
}
616
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
617
GNUTLS_X509_FMT_PEM);
618
if(ret != GNUTLS_E_SUCCESS){
619
fprintf_plus(stderr, "Failed to parse DH parameters in file"
620
" \"%s\": %s\n", dhparamsfilename,
621
safer_gnutls_strerror(ret));
622
dhparamsfilename = NULL;
623
}
624
} while(false);
625
}
626
if(dhparamsfilename == NULL){
627
if(mc->dh_bits == 0){
628
/* Find out the optimal number of DH bits */
629
/* Try to read the private key file */
630
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
631
do {
632
int secfile = open(seckeyfilename, O_RDONLY);
633
if(secfile == -1){
634
perror_plus("open");
635
break;
636
}
637
size_t buffer_capacity = 0;
638
while(true){
639
buffer_capacity = incbuffer((char **)&buffer.data,
640
(size_t)buffer.size,
641
(size_t)buffer_capacity);
642
if(buffer_capacity == 0){
643
perror_plus("incbuffer");
644
free(buffer.data);
645
buffer.data = NULL;
646
break;
647
}
648
ssize_t bytes_read = read(secfile,
649
buffer.data + buffer.size,
650
BUFFER_SIZE);
651
/* EOF */
652
if(bytes_read == 0){
653
break;
654
}
655
/* check bytes_read for failure */
656
if(bytes_read < 0){
657
perror_plus("read");
658
free(buffer.data);
659
buffer.data = NULL;
660
break;
661
}
662
buffer.size += (unsigned int)bytes_read;
663
}
664
close(secfile);
665
} while(false);
666
/* If successful, use buffer to parse private key */
667
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
668
if(buffer.data != NULL){
669
{
670
gnutls_openpgp_privkey_t privkey = NULL;
671
ret = gnutls_openpgp_privkey_init(&privkey);
672
if(ret != GNUTLS_E_SUCCESS){
673
fprintf_plus(stderr, "Error initializing OpenPGP key"
674
" structure: %s",
675
safer_gnutls_strerror(ret));
676
free(buffer.data);
677
buffer.data = NULL;
678
} else {
679
ret = gnutls_openpgp_privkey_import
680
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
681
if(ret != GNUTLS_E_SUCCESS){
682
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
683
safer_gnutls_strerror(ret));
684
privkey = NULL;
685
}
686
free(buffer.data);
687
buffer.data = NULL;
688
if(privkey != NULL){
689
/* Use private key to suggest an appropriate
690
sec_param */
691
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
692
gnutls_openpgp_privkey_deinit(privkey);
693
if(debug){
694
fprintf_plus(stderr, "This OpenPGP key implies using"
695
" a GnuTLS security parameter \"%s\".\n",
696
safe_string(gnutls_sec_param_get_name
697
(sec_param)));
698
}
699
}
700
}
701
}
702
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
703
/* Err on the side of caution */
704
sec_param = GNUTLS_SEC_PARAM_ULTRA;
705
if(debug){
706
fprintf_plus(stderr, "Falling back to security parameter"
707
" \"%s\"\n",
708
safe_string(gnutls_sec_param_get_name
709
(sec_param)));
710
}
711
}
712
}
713
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
714
if(uret != 0){
715
mc->dh_bits = uret;
716
if(debug){
717
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
718
" implies %u DH bits; using that.\n",
719
safe_string(gnutls_sec_param_get_name
720
(sec_param)),
721
mc->dh_bits);
722
}
723
} else {
724
fprintf_plus(stderr, "Failed to get implied number of DH"
725
" bits for security parameter \"%s\"): %s\n",
726
safe_string(gnutls_sec_param_get_name
727
(sec_param)),
728
safer_gnutls_strerror(ret));
729
goto globalfail;
730
}
731
} else if(debug){
732
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
733
mc->dh_bits);
734
}
735
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
736
if(ret != GNUTLS_E_SUCCESS){
737
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
738
" bits): %s\n", mc->dh_bits,
739
safer_gnutls_strerror(ret));
740
goto globalfail;
741
}
742
}
434
if (ret != GNUTLS_E_SUCCESS) {
435
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
436
" %s\n", safer_gnutls_strerror(ret));
437
goto globalfail;
438
}
439
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
440
if (ret != GNUTLS_E_SUCCESS) {
441
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
442
safer_gnutls_strerror(ret));
443
goto globalfail;
444
}
445
743
446
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
744
447
745
448
return 0;
747
450
globalfail:
748
451
749
452
gnutls_certificate_free_credentials(mc->cred);
750
gnutls_dh_params_deinit(mc->dh_params);
453
gnutls_global_deinit();
751
454
return -1;
752
455
}
753
456
754
__attribute__((nonnull, warn_unused_result))
755
static int init_gnutls_session(gnutls_session_t *session,
756
mandos_context *mc){
457
static int init_gnutls_session(mandos_context *mc,
458
gnutls_session_t *session){
757
459
int ret;
758
460
/* GnuTLS session creation */
759
do {
760
ret = gnutls_init(session, GNUTLS_SERVER);
761
if(quit_now){
762
return -1;
763
}
764
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
765
if(ret != GNUTLS_E_SUCCESS){
766
fprintf_plus(stderr,
767
"Error in GnuTLS session initialization: %s\n",
768
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));
769
465
}
770
466
771
467
{
772
468
const char *err;
773
do {
774
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
775
if(quit_now){
776
gnutls_deinit(*session);
777
return -1;
778
}
779
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
780
if(ret != GNUTLS_E_SUCCESS){
781
fprintf_plus(stderr, "Syntax error at: %s\n", err);
782
fprintf_plus(stderr, "GnuTLS error: %s\n",
783
safer_gnutls_strerror(ret));
784
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);
785
475
return -1;
786
476
}
787
477
}
788
478
789
do {
790
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
791
mc->cred);
792
if(quit_now){
793
gnutls_deinit(*session);
794
return -1;
795
}
796
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
797
if(ret != GNUTLS_E_SUCCESS){
798
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
799
safer_gnutls_strerror(ret));
800
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);
801
485
return -1;
802
486
}
803
487
804
488
/* ignore client certificate if any. */
805
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
489
gnutls_certificate_server_set_request (*session,
490
GNUTLS_CERT_IGNORE);
491
492
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
806
493
807
494
return 0;
808
495
}
811
498
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
812
499
__attribute__((unused)) const char *txt){}
813
500
814
/* Set effective uid to 0, return errno */
815
__attribute__((warn_unused_result))
816
error_t raise_privileges(void){
817
error_t old_errno = errno;
818
error_t ret_errno = 0;
819
if(seteuid(0) == -1){
820
ret_errno = errno;
821
}
822
errno = old_errno;
823
return ret_errno;
824
}
825
826
/* Set effective and real user ID to 0. Return errno. */
827
__attribute__((warn_unused_result))
828
error_t raise_privileges_permanently(void){
829
error_t old_errno = errno;
830
error_t ret_errno = raise_privileges();
831
if(ret_errno != 0){
832
errno = old_errno;
833
return ret_errno;
834
}
835
if(setuid(0) == -1){
836
ret_errno = errno;
837
}
838
errno = old_errno;
839
return ret_errno;
840
}
841
842
/* Set effective user ID to unprivileged saved user ID */
843
__attribute__((warn_unused_result))
844
error_t lower_privileges(void){
845
error_t old_errno = errno;
846
error_t ret_errno = 0;
847
if(seteuid(uid) == -1){
848
ret_errno = errno;
849
}
850
errno = old_errno;
851
return ret_errno;
852
}
853
854
/* Lower privileges permanently */
855
__attribute__((warn_unused_result))
856
error_t lower_privileges_permanently(void){
857
error_t old_errno = errno;
858
error_t ret_errno = 0;
859
if(setuid(uid) == -1){
860
ret_errno = errno;
861
}
862
errno = old_errno;
863
return ret_errno;
864
}
865
866
/* Helper function to add_local_route() and delete_local_route() */
867
__attribute__((nonnull, warn_unused_result))
868
static bool add_delete_local_route(const bool add,
869
const char *address,
870
AvahiIfIndex if_index){
871
int ret;
872
char helper[] = "mandos-client-iprouteadddel";
873
char add_arg[] = "add";
874
char delete_arg[] = "delete";
875
char debug_flag[] = "--debug";
876
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
877
if(pluginhelperdir == NULL){
878
if(debug){
879
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
880
" variable not set; cannot run helper\n");
881
}
882
return false;
883
}
884
885
char interface[IF_NAMESIZE];
886
if(if_indextoname((unsigned int)if_index, interface) == NULL){
887
perror_plus("if_indextoname");
888
return false;
889
}
890
891
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
892
if(devnull == -1){
893
perror_plus("open(\"/dev/null\", O_RDONLY)");
894
return false;
895
}
896
pid_t pid = fork();
897
if(pid == 0){
898
/* Child */
899
/* Raise privileges */
900
errno = raise_privileges_permanently();
901
if(errno != 0){
902
perror_plus("Failed to raise privileges");
903
/* _exit(EX_NOPERM); */
904
} else {
905
/* Set group */
906
errno = 0;
907
ret = setgid(0);
908
if(ret == -1){
909
perror_plus("setgid");
910
_exit(EX_NOPERM);
911
}
912
/* Reset supplementary groups */
913
errno = 0;
914
ret = setgroups(0, NULL);
915
if(ret == -1){
916
perror_plus("setgroups");
917
_exit(EX_NOPERM);
918
}
919
}
920
ret = dup2(devnull, STDIN_FILENO);
921
if(ret == -1){
922
perror_plus("dup2(devnull, STDIN_FILENO)");
923
_exit(EX_OSERR);
924
}
925
ret = close(devnull);
926
if(ret == -1){
927
perror_plus("close");
928
_exit(EX_OSERR);
929
}
930
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
931
if(ret == -1){
932
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
933
_exit(EX_OSERR);
934
}
935
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
936
O_RDONLY
937
| O_DIRECTORY
938
| O_PATH
939
| O_CLOEXEC));
940
if(helperdir_fd == -1){
941
perror_plus("open");
942
_exit(EX_UNAVAILABLE);
943
}
944
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
945
helper, O_RDONLY));
946
if(helper_fd == -1){
947
perror_plus("openat");
948
close(helperdir_fd);
949
_exit(EX_UNAVAILABLE);
950
}
951
close(helperdir_fd);
952
#ifdef __GNUC__
953
#pragma GCC diagnostic push
954
#pragma GCC diagnostic ignored "-Wcast-qual"
955
#endif
956
if(fexecve(helper_fd, (char *const [])
957
{ helper, add ? add_arg : delete_arg, (char *)address,
958
interface, debug ? debug_flag : NULL, NULL },
959
environ) == -1){
960
#ifdef __GNUC__
961
#pragma GCC diagnostic pop
962
#endif
963
perror_plus("fexecve");
964
_exit(EXIT_FAILURE);
965
}
966
}
967
if(pid == -1){
968
perror_plus("fork");
969
return false;
970
}
971
int status;
972
pid_t pret = -1;
973
errno = 0;
974
do {
975
pret = waitpid(pid, &status, 0);
976
if(pret == -1 and errno == EINTR and quit_now){
977
int errno_raising = 0;
978
if((errno = raise_privileges()) != 0){
979
errno_raising = errno;
980
perror_plus("Failed to raise privileges in order to"
981
" kill helper program");
982
}
983
if(kill(pid, SIGTERM) == -1){
984
perror_plus("kill");
985
}
986
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
987
perror_plus("Failed to lower privileges after killing"
988
" helper program");
989
}
990
return false;
991
}
992
} while(pret == -1 and errno == EINTR);
993
if(pret == -1){
994
perror_plus("waitpid");
995
return false;
996
}
997
if(WIFEXITED(status)){
998
if(WEXITSTATUS(status) != 0){
999
fprintf_plus(stderr, "Error: iprouteadddel exited"
1000
" with status %d\n", WEXITSTATUS(status));
1001
return false;
1002
}
1003
return true;
1004
}
1005
if(WIFSIGNALED(status)){
1006
fprintf_plus(stderr, "Error: iprouteadddel died by"
1007
" signal %d\n", WTERMSIG(status));
1008
return false;
1009
}
1010
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1011
return false;
1012
}
1013
1014
__attribute__((nonnull, warn_unused_result))
1015
static bool add_local_route(const char *address,
1016
AvahiIfIndex if_index){
1017
if(debug){
1018
fprintf_plus(stderr, "Adding route to %s\n", address);
1019
}
1020
return add_delete_local_route(true, address, if_index);
1021
}
1022
1023
__attribute__((nonnull, warn_unused_result))
1024
static bool delete_local_route(const char *address,
1025
AvahiIfIndex if_index){
1026
if(debug){
1027
fprintf_plus(stderr, "Removing route to %s\n", address);
1028
}
1029
return add_delete_local_route(false, address, if_index);
1030
}
1031
1032
501
/* Called when a Mandos server is found */
1033
__attribute__((nonnull, warn_unused_result))
1034
static int start_mandos_communication(const char *ip, in_port_t port,
502
static int start_mandos_communication(const char *ip, uint16_t port,
1035
503
AvahiIfIndex if_index,
1036
int af, mandos_context *mc){
1037
int ret, tcp_sd = -1;
1038
ssize_t sret;
1039
struct sockaddr_storage to;
504
mandos_context *mc){
505
int ret, tcp_sd;
506
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
1040
507
char *buffer = NULL;
1041
char *decrypted_buffer = NULL;
508
char *decrypted_buffer;
1042
509
size_t buffer_length = 0;
1043
510
size_t buffer_capacity = 0;
511
ssize_t decrypted_buffer_size;
1044
512
size_t written;
1045
int retval = -1;
513
int retval = 0;
514
char interface[IF_NAMESIZE];
1046
515
gnutls_session_t session;
1047
int pf; /* Protocol family */
1048
bool route_added = false;
1049
1050
errno = 0;
1051
1052
if(quit_now){
1053
errno = EINTR;
1054
return -1;
1055
}
1056
1057
switch(af){
1058
case AF_INET6:
1059
pf = PF_INET6;
1060
break;
1061
case AF_INET:
1062
pf = PF_INET;
1063
break;
1064
default:
1065
fprintf_plus(stderr, "Bad address family: %d\n", af);
1066
errno = EINVAL;
1067
return -1;
1068
}
1069
1070
/* If the interface is specified and we have a list of interfaces */
1071
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1072
/* Check if the interface is one of the interfaces we are using */
1073
bool match = false;
1074
{
1075
char *interface = NULL;
1076
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1077
interface))){
1078
if(if_nametoindex(interface) == (unsigned int)if_index){
1079
match = true;
1080
break;
1081
}
1082
}
1083
}
1084
if(not match){
1085
/* This interface does not match any in the list, so we don't
1086
connect to the server */
1087
if(debug){
1088
char interface[IF_NAMESIZE];
1089
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1090
perror_plus("if_indextoname");
1091
} else {
1092
fprintf_plus(stderr, "Skipping server on non-used interface"
1093
" \"%s\"\n",
1094
if_indextoname((unsigned int)if_index,
1095
interface));
1096
}
1097
}
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");
1098
536
return -1;
1099
537
}
538
fprintf(stderr, "Binding to interface %s\n", interface);
1100
539
}
1101
540
1102
ret = init_gnutls_session(&session, mc);
1103
if(ret != 0){
541
memset(&to, 0, sizeof(to));
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");
1104
548
return -1;
1105
549
}
1106
1107
if(debug){
1108
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1109
PRIuMAX "\n", ip, (uintmax_t)port);
1110
}
1111
1112
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
1113
if(tcp_sd < 0){
1114
int e = errno;
1115
perror_plus("socket");
1116
errno = e;
1117
goto mandos_end;
1118
}
1119
1120
if(quit_now){
1121
errno = EINTR;
1122
goto mandos_end;
1123
}
1124
1125
if(af == AF_INET6){
1126
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1127
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1128
ret = inet_pton(af, ip, &to6->sin6_addr);
1129
} else { /* IPv4 */
1130
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1131
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1132
ret = inet_pton(af, ip, &to4->sin_addr);
1133
}
1134
if(ret < 0 ){
1135
int e = errno;
1136
perror_plus("inet_pton");
1137
errno = e;
1138
goto mandos_end;
1139
}
1140
550
if(ret == 0){
1141
int e = errno;
1142
fprintf_plus(stderr, "Bad address: %s\n", ip);
1143
errno = e;
1144
goto mandos_end;
1145
}
1146
if(af == AF_INET6){
1147
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1148
if(IN6_IS_ADDR_LINKLOCAL
1149
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
1150
if(if_index == AVAHI_IF_UNSPEC){
1151
fprintf_plus(stderr, "An IPv6 link-local address is"
1152
" incomplete without a network interface\n");
1153
errno = EINVAL;
1154
goto mandos_end;
1155
}
1156
/* Set the network interface number as scope */
1157
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
1158
}
1159
} else {
1160
((struct sockaddr_in *)&to)->sin_port = htons(port);
1161
}
551
fprintf(stderr, "Bad address: %s\n", ip);
552
return -1;
553
}
554
to.in6.sin6_port = htons(port); /* Spurious warning */
1162
555
1163
if(quit_now){
1164
errno = EINTR;
1165
goto mandos_end;
1166
}
556
to.in6.sin6_scope_id = (uint32_t)if_index;
1167
557
1168
558
if(debug){
1169
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
1170
char interface[IF_NAMESIZE];
1171
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1172
perror_plus("if_indextoname");
1173
} else {
1174
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1175
"\n", ip, interface, (uintmax_t)port);
1176
}
1177
} else {
1178
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1179
ip, (uintmax_t)port);
1180
}
1181
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1182
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1183
if(af == AF_INET6){
1184
ret = getnameinfo((struct sockaddr *)&to,
1185
sizeof(struct sockaddr_in6),
1186
addrstr, sizeof(addrstr), NULL, 0,
1187
NI_NUMERICHOST);
1188
} else {
1189
ret = getnameinfo((struct sockaddr *)&to,
1190
sizeof(struct sockaddr_in),
1191
addrstr, sizeof(addrstr), NULL, 0,
1192
NI_NUMERICHOST);
1193
}
1194
if(ret == EAI_SYSTEM){
1195
perror_plus("getnameinfo");
1196
} else if(ret != 0) {
1197
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1198
} else if(strcmp(addrstr, ip) != 0){
1199
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1200
}
1201
}
1202
1203
if(quit_now){
1204
errno = EINTR;
1205
goto mandos_end;
1206
}
1207
1208
while(true){
1209
if(af == AF_INET6){
1210
ret = connect(tcp_sd, (struct sockaddr *)&to,
1211
sizeof(struct sockaddr_in6));
1212
} else {
1213
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1214
sizeof(struct sockaddr_in));
1215
}
1216
if(ret < 0){
1217
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1218
and if_index != AVAHI_IF_UNSPEC
1219
and connect_to == NULL
1220
and not route_added and
1221
((af == AF_INET6 and not
1222
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1223
&to)->sin6_addr)))
1224
or (af == AF_INET and
1225
/* Not a a IPv4LL address */
1226
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1227
& 0xFFFF0000L) != 0xA9FE0000L))){
1228
/* Work around Avahi bug - Avahi does not announce link-local
1229
addresses if it has a global address, so local hosts with
1230
*only* a link-local address (e.g. Mandos clients) cannot
1231
connect to a Mandos server announced by Avahi on a server
1232
host with a global address. Work around this by retrying
1233
with an explicit route added with the server's address.
1234
1235
Avahi bug reference:
1236
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1237
https://bugs.debian.org/587961
1238
*/
1239
if(debug){
1240
fprintf_plus(stderr, "Mandos server unreachable, trying"
1241
" direct route\n");
1242
}
1243
int e = errno;
1244
route_added = add_local_route(ip, if_index);
1245
if(route_added){
1246
continue;
1247
}
1248
errno = e;
1249
}
1250
if(errno != ECONNREFUSED or debug){
1251
int e = errno;
1252
perror_plus("connect");
1253
errno = e;
1254
}
1255
goto mandos_end;
1256
}
1257
1258
if(quit_now){
1259
errno = EINTR;
1260
goto mandos_end;
1261
}
1262
break;
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);
568
}
569
}
570
}
571
572
ret = connect(tcp_sd, &to.in, sizeof(to));
573
if (ret < 0){
574
perror("connect");
575
return -1;
1263
576
}
1264
577
1265
578
const char *out = mandos_protocol_version;
1266
579
written = 0;
1267
while(true){
580
while (true){
1268
581
size_t out_size = strlen(out);
1269
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
1270
out_size - written));
1271
if(ret == -1){
1272
int e = errno;
1273
perror_plus("write");
1274
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;
1275
587
goto mandos_end;
1276
588
}
1277
589
written += (size_t)ret;
1278
590
if(written < out_size){
1279
591
continue;
1280
592
} else {
1281
if(out == mandos_protocol_version){
593
if (out == mandos_protocol_version){
1282
594
written = 0;
1283
595
out = "\r\n";
1284
596
} else {
1285
597
break;
1286
598
}
1287
599
}
1288
1289
if(quit_now){
1290
errno = EINTR;
1291
goto mandos_end;
1292
}
1293
600
}
1294
601
1295
602
if(debug){
1296
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
1297
}
1298
1299
if(quit_now){
1300
errno = EINTR;
1301
goto mandos_end;
1302
}
1303
1304
/* This casting via intptr_t is to eliminate warning about casting
1305
an int to a pointer type. This is exactly how the GnuTLS Guile
1306
function "set-session-transport-fd!" does it. */
1307
gnutls_transport_set_ptr(session,
1308
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
1309
1310
if(quit_now){
1311
errno = EINTR;
1312
goto mandos_end;
1313
}
1314
1315
do {
1316
ret = gnutls_handshake(session);
1317
if(quit_now){
1318
errno = EINTR;
1319
goto mandos_end;
1320
}
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);
1321
610
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1322
611
1323
if(ret != GNUTLS_E_SUCCESS){
612
if (ret != GNUTLS_E_SUCCESS){
1324
613
if(debug){
1325
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
1326
gnutls_perror(ret);
614
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
615
gnutls_perror (ret);
1327
616
}
1328
errno = EPROTO;
617
retval = -1;
1329
618
goto mandos_end;
1330
619
}
1331
620
1332
621
/* Read OpenPGP packet that contains the wanted password */
1333
622
1334
623
if(debug){
1335
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1336
" %s\n", ip);
624
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
625
ip);
1337
626
}
1338
627
1339
628
while(true){
1340
1341
if(quit_now){
1342
errno = EINTR;
1343
goto mandos_end;
1344
}
1345
1346
buffer_capacity = incbuffer(&buffer, buffer_length,
1347
buffer_capacity);
1348
if(buffer_capacity == 0){
1349
int e = errno;
1350
perror_plus("incbuffer");
1351
errno = e;
1352
goto mandos_end;
1353
}
1354
1355
if(quit_now){
1356
errno = EINTR;
1357
goto mandos_end;
1358
}
1359
1360
sret = gnutls_record_recv(session, buffer+buffer_length,
1361
BUFFER_SIZE);
1362
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){
1363
640
break;
1364
641
}
1365
if(sret < 0){
1366
switch(sret){
642
if (ret < 0){
643
switch(ret){
1367
644
case GNUTLS_E_INTERRUPTED:
1368
645
case GNUTLS_E_AGAIN:
1369
646
break;
1370
647
case GNUTLS_E_REHANDSHAKE:
1371
do {
1372
ret = gnutls_handshake(session);
1373
1374
if(quit_now){
1375
errno = EINTR;
1376
goto mandos_end;
1377
}
648
do{
649
ret = gnutls_handshake (session);
1378
650
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1379
if(ret < 0){
1380
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1381
"***\n");
1382
gnutls_perror(ret);
1383
errno = EPROTO;
651
if (ret < 0){
652
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
653
gnutls_perror (ret);
654
retval = -1;
1384
655
goto mandos_end;
1385
656
}
1386
657
break;
1387
658
default:
1388
fprintf_plus(stderr, "Unknown error while reading data from"
1389
" encrypted session with Mandos server\n");
1390
gnutls_bye(session, GNUTLS_SHUT_RDWR);
1391
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);
1392
663
goto mandos_end;
1393
664
}
1394
665
} else {
1395
buffer_length += (size_t) sret;
666
buffer_length += (size_t) ret;
1396
667
}
1397
668
}
1398
669
1399
670
if(debug){
1400
fprintf_plus(stderr, "Closing TLS session\n");
1401
}
1402
1403
if(quit_now){
1404
errno = EINTR;
1405
goto mandos_end;
1406
}
1407
1408
do {
1409
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
1410
if(quit_now){
1411
errno = EINTR;
1412
goto mandos_end;
1413
}
1414
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1415
1416
if(buffer_length > 0){
1417
ssize_t decrypted_buffer_size;
1418
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1419
&decrypted_buffer, mc);
1420
if(decrypted_buffer_size >= 0){
1421
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){
1422
681
written = 0;
1423
682
while(written < (size_t) decrypted_buffer_size){
1424
if(quit_now){
1425
errno = EINTR;
1426
goto mandos_end;
1427
}
1428
1429
ret = (int)fwrite(decrypted_buffer + written, 1,
1430
(size_t)decrypted_buffer_size - written,
1431
stdout);
683
ret = (int)fwrite (decrypted_buffer + written, 1,
684
(size_t)decrypted_buffer_size - written,
685
stdout);
1432
686
if(ret == 0 and ferror(stdout)){
1433
int e = errno;
1434
687
if(debug){
1435
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1436
strerror(errno));
688
fprintf(stderr, "Error writing encrypted data: %s\n",
689
strerror(errno));
1437
690
}
1438
errno = e;
1439
goto mandos_end;
691
retval = -1;
692
break;
1440
693
}
1441
694
written += (size_t)ret;
1442
695
}
1443
retval = 0;
696
free(decrypted_buffer);
697
} else {
698
retval = -1;
1444
699
}
700
} else {
701
retval = -1;
1445
702
}
1446
703
1447
704
/* Shutdown procedure */
1448
705
1449
706
mandos_end:
1450
{
1451
if(route_added){
1452
if(not delete_local_route(ip, if_index)){
1453
fprintf_plus(stderr, "Failed to delete local route to %s on"
1454
" interface %d", ip, if_index);
1455
}
1456
}
1457
int e = errno;
1458
free(decrypted_buffer);
1459
free(buffer);
1460
if(tcp_sd >= 0){
1461
ret = close(tcp_sd);
1462
}
1463
if(ret == -1){
1464
if(e == 0){
1465
e = errno;
1466
}
1467
perror_plus("close");
1468
}
1469
gnutls_deinit(session);
1470
errno = e;
1471
if(quit_now){
1472
errno = EINTR;
1473
retval = -1;
1474
}
707
free(buffer);
708
ret = TEMP_FAILURE_RETRY(close(tcp_sd));
709
if(ret == -1){
710
perror("close");
1475
711
}
712
gnutls_deinit (session);
1476
713
return retval;
1477
714
}
1478
715
1479
__attribute__((nonnull))
1480
716
static void resolve_callback(AvahiSServiceResolver *r,
1481
717
AvahiIfIndex interface,
1482
AvahiProtocol proto,
718
AVAHI_GCC_UNUSED AvahiProtocol protocol,
1483
719
AvahiResolverEvent event,
1484
720
const char *name,
1485
721
const char *type,
1490
726
AVAHI_GCC_UNUSED AvahiStringList *txt,
1491
727
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1492
728
flags,
1493
void *mc){
1494
if(r == NULL){
1495
return;
1496
}
729
void* userdata) {
730
mandos_context *mc = userdata;
731
assert(r);
1497
732
1498
733
/* Called whenever a service has been resolved successfully or
1499
734
timed out */
1500
735
1501
if(quit_now){
1502
avahi_s_service_resolver_free(r);
1503
return;
1504
}
1505
1506
switch(event){
736
switch (event) {
1507
737
default:
1508
738
case AVAHI_RESOLVER_FAILURE:
1509
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1510
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1511
domain,
1512
avahi_strerror(avahi_server_errno
1513
(((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)));
1514
742
break;
1515
743
1516
744
case AVAHI_RESOLVER_FOUND:
1518
746
char ip[AVAHI_ADDRESS_STR_MAX];
1519
747
avahi_address_snprint(ip, sizeof(ip), address);
1520
748
if(debug){
1521
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1522
PRIdMAX ") on port %" PRIu16 "\n", name,
1523
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);
1524
752
}
1525
int ret = start_mandos_communication(ip, (in_port_t)port,
1526
interface,
1527
avahi_proto_to_af(proto),
1528
mc);
1529
if(ret == 0){
1530
avahi_simple_poll_quit(simple_poll);
1531
} else {
1532
if(not add_server(ip, (in_port_t)port, interface,
1533
avahi_proto_to_af(proto),
1534
&((mandos_context*)mc)->current_server)){
1535
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1536
" list\n", name);
1537
}
753
int ret = start_mandos_communication(ip, port, interface, mc);
754
if (ret == 0){
755
avahi_simple_poll_quit(mc->simple_poll);
1538
756
}
1539
757
}
1540
758
}
1541
759
avahi_s_service_resolver_free(r);
1542
760
}
1543
761
1544
static void browse_callback(AvahiSServiceBrowser *b,
1545
AvahiIfIndex interface,
1546
AvahiProtocol protocol,
1547
AvahiBrowserEvent event,
1548
const char *name,
1549
const char *type,
1550
const char *domain,
1551
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1552
flags,
1553
void *mc){
1554
if(b == NULL){
1555
return;
1556
}
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);
1557
774
1558
775
/* Called whenever a new services becomes available on the LAN or
1559
776
is removed from the LAN */
1560
777
1561
if(quit_now){
1562
return;
1563
}
1564
1565
switch(event){
778
switch (event) {
1566
779
default:
1567
780
case AVAHI_BROWSER_FAILURE:
1568
781
1569
fprintf_plus(stderr, "(Avahi browser) %s\n",
1570
avahi_strerror(avahi_server_errno
1571
(((mandos_context*)mc)->server)));
1572
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);
1573
785
return;
1574
786
1575
787
case AVAHI_BROWSER_NEW:
1578
790
the callback function is called the Avahi server will free the
1579
791
resolver for us. */
1580
792
1581
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1582
interface, protocol, name, type,
1583
domain, protocol, 0,
1584
resolve_callback, mc) == NULL)
1585
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1586
" %s\n", name,
1587
avahi_strerror(avahi_server_errno
1588
(((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)));
1589
799
break;
1590
800
1591
801
case AVAHI_BROWSER_REMOVE:
1594
804
case AVAHI_BROWSER_ALL_FOR_NOW:
1595
805
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1596
806
if(debug){
1597
fprintf_plus(stderr, "No Mandos server found, still"
1598
" searching...\n");
807
fprintf(stderr, "No Mandos server found, still searching...\n");
1599
808
}
1600
809
break;
1601
810
}
1602
811
}
1603
812
1604
/* Signal handler that stops main loop after SIGTERM */
1605
static void handle_sigterm(int sig){
1606
if(quit_now){
1607
return;
1608
}
1609
quit_now = 1;
1610
signal_received = sig;
1611
int old_errno = errno;
1612
/* set main loop to exit */
1613
if(simple_poll != NULL){
1614
avahi_simple_poll_quit(simple_poll);
1615
}
1616
errno = old_errno;
1617
}
1618
1619
__attribute__((nonnull, warn_unused_result))
1620
bool get_flags(const char *ifname, struct ifreq *ifr){
1621
int ret;
1622
error_t ret_errno;
1623
1624
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1625
if(s < 0){
1626
ret_errno = errno;
1627
perror_plus("socket");
1628
errno = ret_errno;
1629
return false;
1630
}
1631
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1632
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1633
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1634
if(ret == -1){
1635
if(debug){
1636
ret_errno = errno;
1637
perror_plus("ioctl SIOCGIFFLAGS");
1638
errno = ret_errno;
1639
}
1640
return false;
1641
}
1642
return true;
1643
}
1644
1645
__attribute__((nonnull, warn_unused_result))
1646
bool good_flags(const char *ifname, const struct ifreq *ifr){
1647
1648
/* Reject the loopback device */
1649
if(ifr->ifr_flags & IFF_LOOPBACK){
1650
if(debug){
1651
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1652
ifname);
1653
}
1654
return false;
1655
}
1656
/* Accept point-to-point devices only if connect_to is specified */
1657
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1658
if(debug){
1659
fprintf_plus(stderr, "Accepting point-to-point interface"
1660
" \"%s\"\n", ifname);
1661
}
1662
return true;
1663
}
1664
/* Otherwise, reject non-broadcast-capable devices */
1665
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1666
if(debug){
1667
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1668
" \"%s\"\n", ifname);
1669
}
1670
return false;
1671
}
1672
/* Reject non-ARP interfaces (including dummy interfaces) */
1673
if(ifr->ifr_flags & IFF_NOARP){
1674
if(debug){
1675
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1676
ifname);
1677
}
1678
return false;
1679
}
1680
1681
/* Accept this device */
1682
if(debug){
1683
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1684
}
1685
return true;
1686
}
1687
1688
/*
1689
* This function determines if a directory entry in /sys/class/net
1690
* corresponds to an acceptable network device.
1691
* (This function is passed to scandir(3) as a filter function.)
1692
*/
1693
__attribute__((nonnull, warn_unused_result))
1694
int good_interface(const struct dirent *if_entry){
1695
if(if_entry->d_name[0] == '.'){
1696
return 0;
1697
}
1698
1699
struct ifreq ifr;
1700
if(not get_flags(if_entry->d_name, &ifr)){
1701
if(debug){
1702
fprintf_plus(stderr, "Failed to get flags for interface "
1703
"\"%s\"\n", if_entry->d_name);
1704
}
1705
return 0;
1706
}
1707
1708
if(not good_flags(if_entry->d_name, &ifr)){
1709
return 0;
1710
}
1711
return 1;
1712
}
1713
1714
/*
1715
* This function determines if a network interface is up.
1716
*/
1717
__attribute__((nonnull, warn_unused_result))
1718
bool interface_is_up(const char *interface){
1719
struct ifreq ifr;
1720
if(not get_flags(interface, &ifr)){
1721
if(debug){
1722
fprintf_plus(stderr, "Failed to get flags for interface "
1723
"\"%s\"\n", interface);
1724
}
1725
return false;
1726
}
1727
1728
return (bool)(ifr.ifr_flags & IFF_UP);
1729
}
1730
1731
/*
1732
* This function determines if a network interface is running
1733
*/
1734
__attribute__((nonnull, warn_unused_result))
1735
bool interface_is_running(const char *interface){
1736
struct ifreq ifr;
1737
if(not get_flags(interface, &ifr)){
1738
if(debug){
1739
fprintf_plus(stderr, "Failed to get flags for interface "
1740
"\"%s\"\n", interface);
1741
}
1742
return false;
1743
}
1744
1745
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1746
}
1747
1748
__attribute__((nonnull, pure, warn_unused_result))
1749
int notdotentries(const struct dirent *direntry){
1750
/* Skip "." and ".." */
1751
if(direntry->d_name[0] == '.'
1752
and (direntry->d_name[1] == '\0'
1753
or (direntry->d_name[1] == '.'
1754
and direntry->d_name[2] == '\0'))){
1755
return 0;
1756
}
1757
return 1;
1758
}
1759
1760
/* Is this directory entry a runnable program? */
1761
__attribute__((nonnull, warn_unused_result))
1762
int runnable_hook(const struct dirent *direntry){
1763
int ret;
1764
size_t sret;
1765
struct stat st;
1766
1767
if((direntry->d_name)[0] == '\0'){
1768
/* Empty name? */
1769
return 0;
1770
}
1771
1772
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1773
"abcdefghijklmnopqrstuvwxyz"
1774
"0123456789"
1775
"_.-");
1776
if((direntry->d_name)[sret] != '\0'){
1777
/* Contains non-allowed characters */
1778
if(debug){
1779
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1780
direntry->d_name);
1781
}
1782
return 0;
1783
}
1784
1785
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1786
if(ret == -1){
1787
if(debug){
1788
perror_plus("Could not stat hook");
1789
}
1790
return 0;
1791
}
1792
if(not (S_ISREG(st.st_mode))){
1793
/* Not a regular file */
1794
if(debug){
1795
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1796
direntry->d_name);
1797
}
1798
return 0;
1799
}
1800
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1801
/* Not executable */
1802
if(debug){
1803
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1804
direntry->d_name);
1805
}
1806
return 0;
1807
}
1808
if(debug){
1809
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1810
direntry->d_name);
1811
}
1812
return 1;
1813
}
1814
1815
__attribute__((nonnull, warn_unused_result))
1816
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1817
mandos_context *mc){
1818
int ret;
1819
struct timespec now;
1820
struct timespec waited_time;
1821
intmax_t block_time;
1822
1823
while(true){
1824
if(mc->current_server == NULL){
1825
if(debug){
1826
fprintf_plus(stderr, "Wait until first server is found."
1827
" No timeout!\n");
1828
}
1829
ret = avahi_simple_poll_iterate(s, -1);
1830
} else {
1831
if(debug){
1832
fprintf_plus(stderr, "Check current_server if we should run"
1833
" it, or wait\n");
1834
}
1835
/* the current time */
1836
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1837
if(ret == -1){
1838
perror_plus("clock_gettime");
1839
return -1;
1840
}
1841
/* Calculating in ms how long time between now and server
1842
who we visted longest time ago. Now - last seen. */
1843
waited_time.tv_sec = (now.tv_sec
1844
- mc->current_server->last_seen.tv_sec);
1845
waited_time.tv_nsec = (now.tv_nsec
1846
- mc->current_server->last_seen.tv_nsec);
1847
/* total time is 10s/10,000ms.
1848
Converting to s from ms by dividing by 1,000,
1849
and ns to ms by dividing by 1,000,000. */
1850
block_time = ((retry_interval
1851
- ((intmax_t)waited_time.tv_sec * 1000))
1852
- ((intmax_t)waited_time.tv_nsec / 1000000));
1853
1854
if(debug){
1855
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1856
block_time);
1857
}
1858
1859
if(block_time <= 0){
1860
ret = start_mandos_communication(mc->current_server->ip,
1861
mc->current_server->port,
1862
mc->current_server->if_index,
1863
mc->current_server->af, mc);
1864
if(ret == 0){
1865
avahi_simple_poll_quit(s);
1866
return 0;
1867
}
1868
ret = clock_gettime(CLOCK_MONOTONIC,
1869
&mc->current_server->last_seen);
1870
if(ret == -1){
1871
perror_plus("clock_gettime");
1872
return -1;
1873
}
1874
mc->current_server = mc->current_server->next;
1875
block_time = 0; /* Call avahi to find new Mandos
1876
servers, but don't block */
1877
}
1878
1879
ret = avahi_simple_poll_iterate(s, (int)block_time);
1880
}
1881
if(ret != 0){
1882
if(ret > 0 or errno != EINTR){
1883
return (ret != 1) ? ret : 0;
1884
}
1885
}
1886
}
1887
}
1888
1889
__attribute__((nonnull))
1890
void run_network_hooks(const char *mode, const char *interface,
1891
const float delay){
1892
struct dirent **direntries = NULL;
1893
if(hookdir_fd == -1){
1894
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1895
| O_CLOEXEC);
1896
if(hookdir_fd == -1){
1897
if(errno == ENOENT){
1898
if(debug){
1899
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1900
" found\n", hookdir);
1901
}
1902
} else {
1903
perror_plus("open");
1904
}
1905
return;
1906
}
1907
}
1908
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1909
runnable_hook, alphasort);
1910
if(numhooks == -1){
1911
perror_plus("scandir");
1912
return;
1913
}
1914
struct dirent *direntry;
1915
int ret;
1916
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1917
if(devnull == -1){
1918
perror_plus("open(\"/dev/null\", O_RDONLY)");
1919
return;
1920
}
1921
for(int i = 0; i < numhooks; i++){
1922
direntry = direntries[i];
1923
if(debug){
1924
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1925
direntry->d_name);
1926
}
1927
pid_t hook_pid = fork();
1928
if(hook_pid == 0){
1929
/* Child */
1930
/* Raise privileges */
1931
errno = raise_privileges_permanently();
1932
if(errno != 0){
1933
perror_plus("Failed to raise privileges");
1934
_exit(EX_NOPERM);
1935
}
1936
/* Set group */
1937
errno = 0;
1938
ret = setgid(0);
1939
if(ret == -1){
1940
perror_plus("setgid");
1941
_exit(EX_NOPERM);
1942
}
1943
/* Reset supplementary groups */
1944
errno = 0;
1945
ret = setgroups(0, NULL);
1946
if(ret == -1){
1947
perror_plus("setgroups");
1948
_exit(EX_NOPERM);
1949
}
1950
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1951
if(ret == -1){
1952
perror_plus("setenv");
1953
_exit(EX_OSERR);
1954
}
1955
ret = setenv("DEVICE", interface, 1);
1956
if(ret == -1){
1957
perror_plus("setenv");
1958
_exit(EX_OSERR);
1959
}
1960
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1961
if(ret == -1){
1962
perror_plus("setenv");
1963
_exit(EX_OSERR);
1964
}
1965
ret = setenv("MODE", mode, 1);
1966
if(ret == -1){
1967
perror_plus("setenv");
1968
_exit(EX_OSERR);
1969
}
1970
char *delaystring;
1971
ret = asprintf(&delaystring, "%f", (double)delay);
1972
if(ret == -1){
1973
perror_plus("asprintf");
1974
_exit(EX_OSERR);
1975
}
1976
ret = setenv("DELAY", delaystring, 1);
1977
if(ret == -1){
1978
free(delaystring);
1979
perror_plus("setenv");
1980
_exit(EX_OSERR);
1981
}
1982
free(delaystring);
1983
if(connect_to != NULL){
1984
ret = setenv("CONNECT", connect_to, 1);
1985
if(ret == -1){
1986
perror_plus("setenv");
1987
_exit(EX_OSERR);
1988
}
1989
}
1990
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
1991
direntry->d_name,
1992
O_RDONLY));
1993
if(hook_fd == -1){
1994
perror_plus("openat");
1995
_exit(EXIT_FAILURE);
1996
}
1997
if(close(hookdir_fd) == -1){
1998
perror_plus("close");
1999
_exit(EXIT_FAILURE);
2000
}
2001
ret = dup2(devnull, STDIN_FILENO);
2002
if(ret == -1){
2003
perror_plus("dup2(devnull, STDIN_FILENO)");
2004
_exit(EX_OSERR);
2005
}
2006
ret = close(devnull);
2007
if(ret == -1){
2008
perror_plus("close");
2009
_exit(EX_OSERR);
2010
}
2011
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2012
if(ret == -1){
2013
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2014
_exit(EX_OSERR);
2015
}
2016
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2017
environ) == -1){
2018
perror_plus("fexecve");
2019
_exit(EXIT_FAILURE);
2020
}
2021
} else {
2022
if(hook_pid == -1){
2023
perror_plus("fork");
2024
free(direntry);
2025
continue;
2026
}
2027
int status;
2028
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2029
perror_plus("waitpid");
2030
free(direntry);
2031
continue;
2032
}
2033
if(WIFEXITED(status)){
2034
if(WEXITSTATUS(status) != 0){
2035
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2036
" with status %d\n", direntry->d_name,
2037
WEXITSTATUS(status));
2038
free(direntry);
2039
continue;
2040
}
2041
} else if(WIFSIGNALED(status)){
2042
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2043
" signal %d\n", direntry->d_name,
2044
WTERMSIG(status));
2045
free(direntry);
2046
continue;
2047
} else {
2048
fprintf_plus(stderr, "Warning: network hook \"%s\""
2049
" crashed\n", direntry->d_name);
2050
free(direntry);
2051
continue;
2052
}
2053
}
2054
if(debug){
2055
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2056
direntry->d_name);
2057
}
2058
free(direntry);
2059
}
2060
free(direntries);
2061
if(close(hookdir_fd) == -1){
2062
perror_plus("close");
2063
} else {
2064
hookdir_fd = -1;
2065
}
2066
close(devnull);
2067
}
2068
2069
__attribute__((nonnull, warn_unused_result))
2070
error_t bring_up_interface(const char *const interface,
2071
const float delay){
2072
error_t old_errno = errno;
2073
int ret;
2074
struct ifreq network;
2075
unsigned int if_index = if_nametoindex(interface);
2076
if(if_index == 0){
2077
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2078
errno = old_errno;
2079
return ENXIO;
2080
}
2081
2082
if(quit_now){
2083
errno = old_errno;
2084
return EINTR;
2085
}
2086
2087
if(not interface_is_up(interface)){
2088
error_t ret_errno = 0, ioctl_errno = 0;
2089
if(not get_flags(interface, &network)){
2090
ret_errno = errno;
2091
fprintf_plus(stderr, "Failed to get flags for interface "
2092
"\"%s\"\n", interface);
2093
errno = old_errno;
2094
return ret_errno;
2095
}
2096
network.ifr_flags |= IFF_UP; /* set flag */
2097
2098
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2099
if(sd == -1){
2100
ret_errno = errno;
2101
perror_plus("socket");
2102
errno = old_errno;
2103
return ret_errno;
2104
}
2105
2106
if(quit_now){
2107
ret = close(sd);
2108
if(ret == -1){
2109
perror_plus("close");
2110
}
2111
errno = old_errno;
2112
return EINTR;
2113
}
2114
2115
if(debug){
2116
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2117
interface);
2118
}
2119
2120
/* Raise privileges */
2121
ret_errno = raise_privileges();
2122
if(ret_errno != 0){
2123
errno = ret_errno;
2124
perror_plus("Failed to raise privileges");
2125
}
2126
2127
#ifdef __linux__
2128
int ret_linux;
2129
bool restore_loglevel = false;
2130
if(ret_errno == 0){
2131
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2132
messages about the network interface to mess up the prompt */
2133
ret_linux = klogctl(8, NULL, 5);
2134
if(ret_linux == -1){
2135
perror_plus("klogctl");
2136
} else {
2137
restore_loglevel = true;
2138
}
2139
}
2140
#endif /* __linux__ */
2141
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2142
ioctl_errno = errno;
2143
#ifdef __linux__
2144
if(restore_loglevel){
2145
ret_linux = klogctl(7, NULL, 0);
2146
if(ret_linux == -1){
2147
perror_plus("klogctl");
2148
}
2149
}
2150
#endif /* __linux__ */
2151
2152
/* If raise_privileges() succeeded above */
2153
if(ret_errno == 0){
2154
/* Lower privileges */
2155
ret_errno = lower_privileges();
2156
if(ret_errno != 0){
2157
errno = ret_errno;
2158
perror_plus("Failed to lower privileges");
2159
}
2160
}
2161
2162
/* Close the socket */
2163
ret = close(sd);
2164
if(ret == -1){
2165
perror_plus("close");
2166
}
2167
2168
if(ret_setflags == -1){
2169
errno = ioctl_errno;
2170
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2171
errno = old_errno;
2172
return ioctl_errno;
2173
}
2174
} else if(debug){
2175
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2176
interface);
2177
}
2178
2179
/* Sleep checking until interface is running.
2180
Check every 0.25s, up to total time of delay */
2181
for(int i=0; i < delay * 4; i++){
2182
if(interface_is_running(interface)){
2183
break;
2184
}
2185
struct timespec sleeptime = { .tv_nsec = 250000000 };
2186
ret = nanosleep(&sleeptime, NULL);
2187
if(ret == -1 and errno != EINTR){
2188
perror_plus("nanosleep");
2189
}
2190
}
2191
2192
errno = old_errno;
2193
return 0;
2194
}
2195
2196
__attribute__((nonnull, warn_unused_result))
2197
error_t take_down_interface(const char *const interface){
2198
error_t old_errno = errno;
2199
struct ifreq network;
2200
unsigned int if_index = if_nametoindex(interface);
2201
if(if_index == 0){
2202
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2203
errno = old_errno;
2204
return ENXIO;
2205
}
2206
if(interface_is_up(interface)){
2207
error_t ret_errno = 0, ioctl_errno = 0;
2208
if(not get_flags(interface, &network) and debug){
2209
ret_errno = errno;
2210
fprintf_plus(stderr, "Failed to get flags for interface "
2211
"\"%s\"\n", interface);
2212
errno = old_errno;
2213
return ret_errno;
2214
}
2215
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2216
2217
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2218
if(sd == -1){
2219
ret_errno = errno;
2220
perror_plus("socket");
2221
errno = old_errno;
2222
return ret_errno;
2223
}
2224
2225
if(debug){
2226
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2227
interface);
2228
}
2229
2230
/* Raise privileges */
2231
ret_errno = raise_privileges();
2232
if(ret_errno != 0){
2233
errno = ret_errno;
2234
perror_plus("Failed to raise privileges");
2235
}
2236
2237
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2238
ioctl_errno = errno;
2239
2240
/* If raise_privileges() succeeded above */
2241
if(ret_errno == 0){
2242
/* Lower privileges */
2243
ret_errno = lower_privileges();
2244
if(ret_errno != 0){
2245
errno = ret_errno;
2246
perror_plus("Failed to lower privileges");
2247
}
2248
}
2249
2250
/* Close the socket */
2251
int ret = close(sd);
2252
if(ret == -1){
2253
perror_plus("close");
2254
}
2255
2256
if(ret_setflags == -1){
2257
errno = ioctl_errno;
2258
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2259
errno = old_errno;
2260
return ioctl_errno;
2261
}
2262
} else if(debug){
2263
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2264
interface);
2265
}
2266
2267
errno = old_errno;
2268
return 0;
2269
}
2270
2271
813
int main(int argc, char *argv[]){
2272
mandos_context mc = { .server = NULL, .dh_bits = 0,
2273
.priority = "SECURE256:!CTYPE-X.509"
2274
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2275
.current_server = NULL, .interfaces = NULL,
2276
.interfaces_size = 0 };
2277
AvahiSServiceBrowser *sb = NULL;
2278
error_t ret_errno;
2279
int ret;
2280
intmax_t tmpmax;
2281
char *tmp;
2282
int exitcode = EXIT_SUCCESS;
2283
char *interfaces_to_take_down = NULL;
2284
size_t interfaces_to_take_down_size = 0;
2285
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2286
char old_tempdir[] = "/tmp/mandosXXXXXX";
2287
char *tempdir = NULL;
2288
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2289
const char *seckey = PATHDIR "/" SECKEY;
2290
const char *pubkey = PATHDIR "/" PUBKEY;
2291
const char *dh_params_file = NULL;
2292
char *interfaces_hooks = NULL;
2293
2294
bool gnutls_initialized = false;
2295
bool gpgme_initialized = false;
2296
float delay = 2.5f;
2297
double retry_interval = 10; /* 10s between trying a server and
2298
retrying the same server again */
2299
2300
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
2301
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
2302
2303
uid = getuid();
2304
gid = getgid();
2305
2306
/* Lower any group privileges we might have, just to be safe */
2307
errno = 0;
2308
ret = setgid(gid);
2309
if(ret == -1){
2310
perror_plus("setgid");
2311
}
2312
2313
/* Lower user privileges (temporarily) */
2314
errno = 0;
2315
ret = seteuid(uid);
2316
if(ret == -1){
2317
perror_plus("seteuid");
2318
}
2319
2320
if(quit_now){
2321
goto end;
2322
}
2323
2324
{
2325
struct argp_option options[] = {
2326
{ .name = "debug", .key = 128,
2327
.doc = "Debug mode", .group = 3 },
2328
{ .name = "connect", .key = 'c',
2329
.arg = "ADDRESS:PORT",
2330
.doc = "Connect directly to a specific Mandos server",
2331
.group = 1 },
2332
{ .name = "interface", .key = 'i',
2333
.arg = "NAME",
2334
.doc = "Network interface that will be used to search for"
2335
" Mandos servers",
2336
.group = 1 },
2337
{ .name = "seckey", .key = 's',
2338
.arg = "FILE",
2339
.doc = "OpenPGP secret key file base name",
2340
.group = 1 },
2341
{ .name = "pubkey", .key = 'p',
2342
.arg = "FILE",
2343
.doc = "OpenPGP public key file base name",
2344
.group = 2 },
2345
{ .name = "dh-bits", .key = 129,
2346
.arg = "BITS",
2347
.doc = "Bit length of the prime number used in the"
2348
" Diffie-Hellman key exchange",
2349
.group = 2 },
2350
{ .name = "dh-params", .key = 134,
2351
.arg = "FILE",
2352
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2353
" for the Diffie-Hellman key exchange",
2354
.group = 2 },
2355
{ .name = "priority", .key = 130,
2356
.arg = "STRING",
2357
.doc = "GnuTLS priority string for the TLS handshake",
2358
.group = 1 },
2359
{ .name = "delay", .key = 131,
2360
.arg = "SECONDS",
2361
.doc = "Maximum delay to wait for interface startup",
2362
.group = 2 },
2363
{ .name = "retry", .key = 132,
2364
.arg = "SECONDS",
2365
.doc = "Retry interval used when denied by the Mandos server",
2366
.group = 2 },
2367
{ .name = "network-hook-dir", .key = 133,
2368
.arg = "DIR",
2369
.doc = "Directory where network hooks are located",
2370
.group = 2 },
2371
/*
2372
* These reproduce what we would get without ARGP_NO_HELP
2373
*/
2374
{ .name = "help", .key = '?',
2375
.doc = "Give this help list", .group = -1 },
2376
{ .name = "usage", .key = -3,
2377
.doc = "Give a short usage message", .group = -1 },
2378
{ .name = "version", .key = 'V',
2379
.doc = "Print program version", .group = -1 },
2380
{ .name = NULL }
2381
};
2382
2383
error_t parse_opt(int key, char *arg,
2384
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
}
2385
1002
errno = 0;
2386
switch(key){
2387
case 128: /* --debug */
2388
debug = true;
2389
break;
2390
case 'c': /* --connect */
2391
connect_to = arg;
2392
break;
2393
case 'i': /* --interface */
2394
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2395
arg, (int)',');
2396
if(ret_errno != 0){
2397
argp_error(state, "%s", strerror(ret_errno));
2398
}
2399
break;
2400
case 's': /* --seckey */
2401
seckey = arg;
2402
break;
2403
case 'p': /* --pubkey */
2404
pubkey = arg;
2405
break;
2406
case 129: /* --dh-bits */
2407
errno = 0;
2408
tmpmax = strtoimax(arg, &tmp, 10);
2409
if(errno != 0 or tmp == arg or *tmp != '\0'
2410
or tmpmax != (typeof(mc.dh_bits))tmpmax){
2411
argp_error(state, "Bad number of DH bits");
2412
}
2413
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2414
break;
2415
case 134: /* --dh-params */
2416
dh_params_file = arg;
2417
break;
2418
case 130: /* --priority */
2419
mc.priority = arg;
2420
break;
2421
case 131: /* --delay */
2422
errno = 0;
2423
delay = strtof(arg, &tmp);
2424
if(errno != 0 or tmp == arg or *tmp != '\0'){
2425
argp_error(state, "Bad delay");
2426
}
2427
case 132: /* --retry */
2428
errno = 0;
2429
retry_interval = strtod(arg, &tmp);
2430
if(errno != 0 or tmp == arg or *tmp != '\0'
2431
or (retry_interval * 1000) > INT_MAX
2432
or retry_interval < 0){
2433
argp_error(state, "Bad retry interval");
2434
}
2435
break;
2436
case 133: /* --network-hook-dir */
2437
hookdir = arg;
2438
break;
2439
/*
2440
* These reproduce what we would get without ARGP_NO_HELP
2441
*/
2442
case '?': /* --help */
2443
argp_state_help(state, state->out_stream,
2444
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2445
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2446
case -3: /* --usage */
2447
argp_state_help(state, state->out_stream,
2448
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2449
case 'V': /* --version */
2450
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2451
exit(argp_err_exit_status);
2452
break;
2453
default:
2454
return ARGP_ERR_UNKNOWN;
2455
}
2456
return errno;
2457
}
2458
2459
struct argp argp = { .options = options, .parser = parse_opt,
2460
.args_doc = "",
2461
.doc = "Mandos client -- Get and decrypt"
2462
" passwords from a Mandos server" };
2463
ret = argp_parse(&argp, argc, argv,
2464
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2465
switch(ret){
2466
case 0:
2467
break;
2468
case ENOMEM:
2469
default:
2470
errno = ret;
2471
perror_plus("argp_parse");
2472
exitcode = EX_OSERR;
2473
goto end;
2474
case EINVAL:
2475
exitcode = EX_USAGE;
2476
goto end;
2477
}
2478
}
2479
2480
{
2481
/* Work around Debian bug #633582:
2482
<http://bugs.debian.org/633582> */
2483
2484
/* Re-raise privileges */
2485
ret_errno = raise_privileges();
2486
if(ret_errno != 0){
2487
errno = ret_errno;
2488
perror_plus("Failed to raise privileges");
2489
} else {
2490
struct stat st;
2491
2492
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2493
int seckey_fd = open(seckey, O_RDONLY);
2494
if(seckey_fd == -1){
2495
perror_plus("open");
2496
} else {
2497
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2498
if(ret == -1){
2499
perror_plus("fstat");
2500
} else {
2501
if(S_ISREG(st.st_mode)
2502
and st.st_uid == 0 and st.st_gid == 0){
2503
ret = fchown(seckey_fd, uid, gid);
2504
if(ret == -1){
2505
perror_plus("fchown");
2506
}
2507
}
2508
}
2509
close(seckey_fd);
2510
}
2511
}
2512
2513
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2514
int pubkey_fd = open(pubkey, O_RDONLY);
2515
if(pubkey_fd == -1){
2516
perror_plus("open");
2517
} else {
2518
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2519
if(ret == -1){
2520
perror_plus("fstat");
2521
} else {
2522
if(S_ISREG(st.st_mode)
2523
and st.st_uid == 0 and st.st_gid == 0){
2524
ret = fchown(pubkey_fd, uid, gid);
2525
if(ret == -1){
2526
perror_plus("fchown");
2527
}
2528
}
2529
}
2530
close(pubkey_fd);
2531
}
2532
}
2533
2534
if(dh_params_file != NULL
2535
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2536
int dhparams_fd = open(dh_params_file, O_RDONLY);
2537
if(dhparams_fd == -1){
2538
perror_plus("open");
2539
} else {
2540
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2541
if(ret == -1){
2542
perror_plus("fstat");
2543
} else {
2544
if(S_ISREG(st.st_mode)
2545
and st.st_uid == 0 and st.st_gid == 0){
2546
ret = fchown(dhparams_fd, uid, gid);
2547
if(ret == -1){
2548
perror_plus("fchown");
2549
}
2550
}
2551
}
2552
close(dhparams_fd);
2553
}
2554
}
2555
2556
/* Lower privileges */
2557
ret_errno = lower_privileges();
2558
if(ret_errno != 0){
2559
errno = ret_errno;
2560
perror_plus("Failed to lower privileges");
2561
}
2562
}
2563
}
2564
2565
/* Remove invalid interface names (except "none") */
2566
{
2567
char *interface = NULL;
2568
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2569
interface))){
2570
if(strcmp(interface, "none") != 0
2571
and if_nametoindex(interface) == 0){
2572
if(interface[0] != '\0'){
2573
fprintf_plus(stderr, "Not using nonexisting interface"
2574
" \"%s\"\n", interface);
2575
}
2576
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2577
interface = NULL;
2578
}
2579
}
2580
}
2581
2582
/* Run network hooks */
2583
{
2584
if(mc.interfaces != NULL){
2585
interfaces_hooks = malloc(mc.interfaces_size);
2586
if(interfaces_hooks == NULL){
2587
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;
2588
1007
goto end;
2589
1008
}
2590
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2591
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2592
}
2593
run_network_hooks("start", interfaces_hooks != NULL ?
2594
interfaces_hooks : "", delay);
2595
}
2596
2597
if(not debug){
2598
avahi_set_log_function(empty_log);
2599
}
2600
2601
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2602
from the signal handler */
2603
/* Initialize the pseudo-RNG for Avahi */
2604
srand((unsigned int) time(NULL));
2605
simple_poll = avahi_simple_poll_new();
2606
if(simple_poll == NULL){
2607
fprintf_plus(stderr,
2608
"Avahi: Failed to create simple poll object.\n");
2609
exitcode = EX_UNAVAILABLE;
2610
goto end;
2611
}
2612
2613
sigemptyset(&sigterm_action.sa_mask);
2614
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2615
if(ret == -1){
2616
perror_plus("sigaddset");
2617
exitcode = EX_OSERR;
2618
goto end;
2619
}
2620
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2621
if(ret == -1){
2622
perror_plus("sigaddset");
2623
exitcode = EX_OSERR;
2624
goto end;
2625
}
2626
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2627
if(ret == -1){
2628
perror_plus("sigaddset");
2629
exitcode = EX_OSERR;
2630
goto end;
2631
}
2632
/* Need to check if the handler is SIG_IGN before handling:
2633
| [[info:libc:Initial Signal Actions]] |
2634
| [[info:libc:Basic Signal Handling]] |
2635
*/
2636
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2637
if(ret == -1){
2638
perror_plus("sigaction");
2639
return EX_OSERR;
2640
}
2641
if(old_sigterm_action.sa_handler != SIG_IGN){
2642
ret = sigaction(SIGINT, &sigterm_action, NULL);
2643
if(ret == -1){
2644
perror_plus("sigaction");
2645
exitcode = EX_OSERR;
2646
goto end;
2647
}
2648
}
2649
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2650
if(ret == -1){
2651
perror_plus("sigaction");
2652
return EX_OSERR;
2653
}
2654
if(old_sigterm_action.sa_handler != SIG_IGN){
2655
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2656
if(ret == -1){
2657
perror_plus("sigaction");
2658
exitcode = EX_OSERR;
2659
goto end;
2660
}
2661
}
2662
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2663
if(ret == -1){
2664
perror_plus("sigaction");
2665
return EX_OSERR;
2666
}
2667
if(old_sigterm_action.sa_handler != SIG_IGN){
2668
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2669
if(ret == -1){
2670
perror_plus("sigaction");
2671
exitcode = EX_OSERR;
2672
goto end;
2673
}
2674
}
2675
2676
/* If no interfaces were specified, make a list */
2677
if(mc.interfaces == NULL){
2678
struct dirent **direntries = NULL;
2679
/* Look for any good interfaces */
2680
ret = scandir(sys_class_net, &direntries, good_interface,
2681
alphasort);
2682
if(ret >= 1){
2683
/* Add all found interfaces to interfaces list */
2684
for(int i = 0; i < ret; ++i){
2685
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2686
direntries[i]->d_name);
2687
if(ret_errno != 0){
2688
errno = ret_errno;
2689
perror_plus("argz_add");
2690
free(direntries[i]);
2691
continue;
2692
}
2693
if(debug){
2694
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2695
direntries[i]->d_name);
2696
}
2697
free(direntries[i]);
2698
}
2699
free(direntries);
2700
} else {
2701
if(ret == 0){
2702
free(direntries);
2703
}
2704
fprintf_plus(stderr, "Could not find a network interface\n");
2705
exitcode = EXIT_FAILURE;
2706
goto end;
2707
}
2708
}
2709
2710
/* Bring up interfaces which are down, and remove any "none"s */
2711
{
2712
char *interface = NULL;
2713
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2714
interface))){
2715
/* If interface name is "none", stop bringing up interfaces.
2716
Also remove all instances of "none" from the list */
2717
if(strcmp(interface, "none") == 0){
2718
argz_delete(&mc.interfaces, &mc.interfaces_size,
2719
interface);
2720
interface = NULL;
2721
while((interface = argz_next(mc.interfaces,
2722
mc.interfaces_size, interface))){
2723
if(strcmp(interface, "none") == 0){
2724
argz_delete(&mc.interfaces, &mc.interfaces_size,
2725
interface);
2726
interface = NULL;
2727
}
2728
}
2729
break;
2730
}
2731
bool interface_was_up = interface_is_up(interface);
2732
errno = bring_up_interface(interface, delay);
2733
if(not interface_was_up){
2734
if(errno != 0){
2735
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2736
" %s\n", interface, strerror(errno));
2737
} else {
2738
errno = argz_add(&interfaces_to_take_down,
2739
&interfaces_to_take_down_size,
2740
interface);
2741
if(errno != 0){
2742
perror_plus("argz_add");
2743
}
2744
}
2745
}
2746
}
2747
if(debug and (interfaces_to_take_down == NULL)){
2748
fprintf_plus(stderr, "No interfaces were brought up\n");
2749
}
2750
}
2751
2752
/* If we only got one interface, explicitly use only that one */
2753
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2754
if(debug){
2755
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2756
mc.interfaces);
2757
}
2758
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2759
}
2760
2761
if(quit_now){
2762
goto end;
2763
}
2764
2765
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2766
if(ret == -1){
2767
fprintf_plus(stderr, "init_gnutls_global failed\n");
2768
exitcode = EX_UNAVAILABLE;
2769
goto end;
2770
} else {
2771
gnutls_initialized = true;
2772
}
2773
2774
if(quit_now){
2775
goto end;
2776
}
2777
2778
/* Try /run/tmp before /tmp */
2779
tempdir = mkdtemp(run_tempdir);
2780
if(tempdir == NULL and errno == ENOENT){
2781
if(debug){
2782
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2783
run_tempdir, old_tempdir);
2784
}
2785
tempdir = mkdtemp(old_tempdir);
2786
}
2787
if(tempdir == NULL){
2788
perror_plus("mkdtemp");
2789
goto end;
2790
}
2791
2792
if(quit_now){
2793
goto end;
2794
}
2795
2796
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2797
fprintf_plus(stderr, "init_gpgme failed\n");
2798
exitcode = EX_UNAVAILABLE;
2799
goto end;
2800
} else {
2801
gpgme_initialized = true;
2802
}
2803
2804
if(quit_now){
2805
goto end;
2806
}
2807
2808
if(connect_to != NULL){
2809
/* Connect directly, do not use Zeroconf */
2810
/* (Mainly meant for debugging) */
2811
char *address = strrchr(connect_to, ':');
2812
2813
if(address == NULL){
2814
fprintf_plus(stderr, "No colon in address\n");
2815
exitcode = EX_USAGE;
2816
goto end;
2817
}
2818
2819
if(quit_now){
2820
goto end;
2821
}
2822
2823
in_port_t port;
2824
errno = 0;
2825
tmpmax = strtoimax(address+1, &tmp, 10);
2826
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2827
or tmpmax != (in_port_t)tmpmax){
2828
fprintf_plus(stderr, "Bad port number\n");
2829
exitcode = EX_USAGE;
2830
goto end;
2831
}
2832
2833
if(quit_now){
2834
goto end;
2835
}
2836
2837
port = (in_port_t)tmpmax;
2838
*address = '\0';
2839
/* Colon in address indicates IPv6 */
2840
int af;
2841
if(strchr(connect_to, ':') != NULL){
2842
af = AF_INET6;
2843
/* Accept [] around IPv6 address - see RFC 5952 */
2844
if(connect_to[0] == '[' and address[-1] == ']')
2845
{
2846
connect_to++;
2847
address[-1] = '\0';
2848
}
2849
} else {
2850
af = AF_INET;
2851
}
2852
address = connect_to;
2853
2854
if(quit_now){
2855
goto end;
2856
}
2857
2858
while(not quit_now){
2859
ret = start_mandos_communication(address, port, if_index, af,
2860
&mc);
2861
if(quit_now or ret == 0){
2862
break;
2863
}
2864
if(debug){
2865
fprintf_plus(stderr, "Retrying in %d seconds\n",
2866
(int)retry_interval);
2867
}
2868
sleep((unsigned int)retry_interval);
2869
}
2870
2871
if(not quit_now){
2872
exitcode = EXIT_SUCCESS;
2873
}
2874
2875
goto end;
2876
}
2877
2878
if(quit_now){
2879
goto end;
2880
}
2881
2882
{
2883
AvahiServerConfig config;
2884
/* Do not publish any local Zeroconf records */
2885
avahi_server_config_init(&config);
2886
config.publish_hinfo = 0;
2887
config.publish_addresses = 0;
2888
config.publish_workstation = 0;
2889
config.publish_domain = 0;
2890
2891
/* Allocate a new server */
2892
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2893
&config, NULL, NULL, &ret_errno);
2894
2895
/* Free the Avahi configuration data */
2896
avahi_server_config_free(&config);
2897
}
2898
2899
/* Check if creating the Avahi server object succeeded */
2900
if(mc.server == NULL){
2901
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2902
avahi_strerror(ret_errno));
2903
exitcode = EX_UNAVAILABLE;
2904
goto end;
2905
}
2906
2907
if(quit_now){
2908
goto end;
2909
}
2910
2911
/* Create the Avahi service browser */
2912
sb = avahi_s_service_browser_new(mc.server, if_index,
2913
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2914
NULL, 0, browse_callback,
2915
(void *)&mc);
2916
if(sb == NULL){
2917
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2918
avahi_strerror(avahi_server_errno(mc.server)));
2919
exitcode = EX_UNAVAILABLE;
2920
goto end;
2921
}
2922
2923
if(quit_now){
2924
goto end;
2925
}
2926
2927
/* Run the main loop */
2928
2929
if(debug){
2930
fprintf_plus(stderr, "Starting Avahi loop search\n");
2931
}
2932
2933
ret = avahi_loop_with_timeout(simple_poll,
2934
(int)(retry_interval * 1000), &mc);
2935
if(debug){
2936
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2937
(ret == 0) ? "successfully" : "with error");
2938
}
2939
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
2940
1082
end:
2941
2942
if(debug){
2943
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2944
}
2945
2946
/* Cleanup things */
2947
free(mc.interfaces);
2948
2949
if(sb != NULL)
2950
avahi_s_service_browser_free(sb);
2951
2952
if(mc.server != NULL)
2953
avahi_server_free(mc.server);
2954
2955
if(simple_poll != NULL)
2956
avahi_simple_poll_free(simple_poll);
2957
2958
if(gnutls_initialized){
2959
gnutls_certificate_free_credentials(mc.cred);
2960
gnutls_dh_params_deinit(mc.dh_params);
2961
}
2962
2963
if(gpgme_initialized){
2964
gpgme_release(mc.ctx);
2965
}
2966
2967
/* Cleans up the circular linked list of Mandos servers the client
2968
has seen */
2969
if(mc.current_server != NULL){
2970
mc.current_server->prev->next = NULL;
2971
while(mc.current_server != NULL){
2972
server *next = mc.current_server->next;
2973
#ifdef __GNUC__
2974
#pragma GCC diagnostic push
2975
#pragma GCC diagnostic ignored "-Wcast-qual"
2976
#endif
2977
free((char *)(mc.current_server->ip));
2978
#ifdef __GNUC__
2979
#pragma GCC diagnostic pop
2980
#endif
2981
free(mc.current_server);
2982
mc.current_server = next;
2983
}
2984
}
2985
2986
/* Re-raise privileges */
2987
{
2988
ret_errno = raise_privileges();
2989
if(ret_errno != 0){
2990
errno = ret_errno;
2991
perror_plus("Failed to raise privileges");
2992
} else {
2993
2994
/* Run network hooks */
2995
run_network_hooks("stop", interfaces_hooks != NULL ?
2996
interfaces_hooks : "", delay);
2997
2998
/* Take down the network interfaces which were brought up */
2999
{
3000
char *interface = NULL;
3001
while((interface=argz_next(interfaces_to_take_down,
3002
interfaces_to_take_down_size,
3003
interface))){
3004
ret_errno = take_down_interface(interface);
3005
if(ret_errno != 0){
3006
errno = ret_errno;
3007
perror_plus("Failed to take down interface");
3008
}
3009
}
3010
if(debug and (interfaces_to_take_down == NULL)){
3011
fprintf_plus(stderr, "No interfaces needed to be taken"
3012
" down\n");
3013
}
3014
}
3015
}
3016
3017
ret_errno = lower_privileges_permanently();
3018
if(ret_errno != 0){
3019
errno = ret_errno;
3020
perror_plus("Failed to lower privileges permanently");
3021
}
3022
}
3023
3024
free(interfaces_to_take_down);
3025
free(interfaces_hooks);
3026
3027
/* Removes the GPGME temp directory and all files inside */
3028
if(tempdir != NULL){
3029
struct dirent **direntries = NULL;
3030
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
3031
| O_NOFOLLOW
3032
| O_DIRECTORY
3033
| O_PATH));
3034
if(tempdir_fd == -1){
3035
perror_plus("open");
3036
} else {
3037
int numentries = scandirat(tempdir_fd, ".", &direntries,
3038
notdotentries, alphasort);
3039
if(numentries >= 0){
3040
for(int i = 0; i < numentries; i++){
3041
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
3042
if(ret == -1){
3043
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
3044
" \"%s\", 0): %s\n", tempdir,
3045
direntries[i]->d_name, strerror(errno));
3046
}
3047
free(direntries[i]);
3048
}
3049
3050
/* need to clean even if 0 because man page doesn't specify */
3051
free(direntries);
3052
if(numentries == -1){
3053
perror_plus("scandir");
3054
}
3055
ret = rmdir(tempdir);
3056
if(ret == -1 and errno != ENOENT){
3057
perror_plus("rmdir");
3058
}
3059
}
3060
close(tempdir_fd);
3061
}
3062
}
3063
3064
if(quit_now){
3065
sigemptyset(&old_sigterm_action.sa_mask);
3066
old_sigterm_action.sa_handler = SIG_DFL;
3067
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
3068
&old_sigterm_action,
3069
NULL));
3070
if(ret == -1){
3071
perror_plus("sigaction");
3072
}
3073
do {
3074
ret = raise(signal_received);
3075
} while(ret != 0 and errno == EINTR);
3076
if(ret != 0){
3077
perror_plus("raise");
3078
abort();
3079
}
3080
TEMP_FAILURE_RETRY(pause());
3081
}
3082
3083
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;
3084
1144
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0