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- Committer: Teddy Hogeborn
- Date: 2008-09-06 16:33:54 UTC
- Revision ID: teddy@fukt.bsnet.se-20080906163354-x2l238fvbs2xashj
* .bzrignore: Rename "password-request" to "mandos-client".
- 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 © 2008-2015 Teddy Hogeborn
13
* Copyright © 2008-2015 Björn Påhlsson
12
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
14
13
*
15
14
* This program is free software: you can redistribute it and/or
16
15
* modify it under the terms of the GNU General Public License as
26
25
* along with this program. If not, see
27
26
* <http://www.gnu.org/licenses/>.
28
27
*
29
* Contact the authors at <mandos@recompile.se>.
28
* Contact the authors at <mandos@fukt.bsnet.se>.
30
29
*/
31
30
32
31
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
34
32
#define _LARGEFILE_SOURCE
35
#endif /* not _LARGEFILE_SOURCE */
36
#ifndef _FILE_OFFSET_BITS
37
33
#define _FILE_OFFSET_BITS 64
38
#endif /* not _FILE_OFFSET_BITS */
39
34
40
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
36
42
37
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
38
stdout, ferror() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
39
#include <stdint.h> /* uint16_t, uint32_t */
45
40
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
#include <stdbool.h> /* bool, false, true */
41
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
42
srand() */
43
#include <stdbool.h> /* bool, true */
49
44
#include <string.h> /* memset(), strcmp(), strlen(),
50
45
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
46
#include <sys/ioctl.h> /* ioctl */
52
47
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
48
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
49
SOCK_STREAM, INET6_ADDRSTRLEN,
50
uid_t, gid_t, open(), opendir(), DIR */
51
#include <sys/stat.h> /* open() */
57
52
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
*/
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
strtoimax() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
53
struct in6_addr, inet_pton(),
54
connect() */
55
#include <fcntl.h> /* open() */
56
#include <dirent.h> /* opendir(), struct dirent, readdir() */
57
#include <inttypes.h> /* PRIu16 */
58
#include <assert.h> /* assert() */
59
#include <errno.h> /* perror(), errno */
60
#include <time.h> /* time() */
68
61
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
62
SIOCSIFFLAGS, if_indextoname(),
70
63
if_nametoindex(), IF_NAMESIZE */
71
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
*/
64
#include <netinet/in.h>
74
65
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
79
#include <iso646.h> /* not, or, and */
66
getuid(), getgid(), setuid(),
67
setgid() */
68
#include <arpa/inet.h> /* inet_pton(), htons */
69
#include <iso646.h> /* not, and */
80
70
#include <argp.h> /* struct argp_option, error_t, struct
81
71
argp_state, struct argp,
82
72
argp_parse(), ARGP_KEY_ARG,
83
73
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
84
#include <signal.h> /* sigemptyset(), sigaddset(),
85
sigaction(), SIGTERM, sig_atomic_t,
86
raise() */
87
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
88
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
89
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
90
WEXITSTATUS(), WTERMSIG() */
91
#include <grp.h> /* setgroups() */
92
#include <argz.h> /* argz_add_sep(), argz_next(),
93
argz_delete(), argz_append(),
94
argz_stringify(), argz_add(),
95
argz_count() */
96
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
97
EAI_SYSTEM, gai_strerror() */
98
99
#ifdef __linux__
100
#include <sys/klog.h> /* klogctl() */
101
#endif /* __linux__ */
102
74
103
75
/* Avahi */
104
76
/* All Avahi types, constants and functions
117
89
gnutls_*
118
90
init_gnutls_session(),
119
91
GNUTLS_* */
120
#include <gnutls/openpgp.h>
121
/* gnutls_certificate_set_openpgp_key_file(),
122
GNUTLS_OPENPGP_FMT_BASE64 */
92
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
93
GNUTLS_OPENPGP_FMT_BASE64 */
123
94
124
95
/* GPGME */
125
96
#include <gpgme.h> /* All GPGME types, constants and
130
101
131
102
#define BUFFER_SIZE 256
132
103
104
/*
105
#define PATHDIR "/conf/conf.d/mandos"
106
*/
107
133
108
#define PATHDIR "/conf/conf.d/mandos"
134
109
#define SECKEY "seckey.txt"
135
110
#define PUBKEY "pubkey.txt"
136
#define HOOKDIR "/lib/mandos/network-hooks.d"
137
111
138
112
bool debug = false;
139
113
static const char mandos_protocol_version[] = "1";
140
const char *argp_program_version = "mandos-client " VERSION;
141
const char *argp_program_bug_address = "<mandos@recompile.se>";
142
static const char sys_class_net[] = "/sys/class/net";
143
char *connect_to = NULL;
144
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
146
uid_t uid = 65534;
147
gid_t gid = 65534;
148
149
/* Doubly linked list that need to be circularly linked when used */
150
typedef struct server{
151
const char *ip;
152
in_port_t port;
153
AvahiIfIndex if_index;
154
int af;
155
struct timespec last_seen;
156
struct server *next;
157
struct server *prev;
158
} server;
114
const char *argp_program_version = "mandos-client 1.0";
115
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
159
116
160
117
/* Used for passing in values through the Avahi callback functions */
161
118
typedef struct {
119
AvahiSimplePoll *simple_poll;
162
120
AvahiServer *server;
163
121
gnutls_certificate_credentials_t cred;
164
122
unsigned int dh_bits;
165
123
gnutls_dh_params_t dh_params;
166
124
const char *priority;
167
125
gpgme_ctx_t ctx;
168
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
171
126
} mandos_context;
172
127
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
175
176
sig_atomic_t quit_now = 0;
177
int signal_received = 0;
178
179
/* Function to use when printing errors */
180
void perror_plus(const char *print_text){
181
int e = errno;
182
fprintf(stderr, "Mandos plugin %s: ",
183
program_invocation_short_name);
184
errno = e;
185
perror(print_text);
186
}
187
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
189
int fprintf_plus(FILE *stream, const char *format, ...){
190
va_list ap;
191
va_start (ap, format);
192
193
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
194
program_invocation_short_name));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
196
}
197
198
128
/*
199
* Make additional room in "buffer" for at least BUFFER_SIZE more
200
* bytes. "buffer_capacity" is how much is currently allocated,
129
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
130
* "buffer_capacity" is how much is currently allocated,
201
131
* "buffer_length" is how much is already used.
202
132
*/
203
__attribute__((nonnull, warn_unused_result))
204
size_t incbuffer(char **buffer, size_t buffer_length,
205
size_t buffer_capacity){
206
if(buffer_length + BUFFER_SIZE > buffer_capacity){
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
208
if(new_buf == NULL){
209
int old_errno = errno;
210
free(*buffer);
211
errno = old_errno;
212
*buffer = NULL;
133
size_t adjustbuffer(char **buffer, size_t buffer_length,
134
size_t buffer_capacity){
135
if (buffer_length + BUFFER_SIZE > buffer_capacity){
136
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
137
if (buffer == NULL){
213
138
return 0;
214
139
}
215
*buffer = new_buf;
216
140
buffer_capacity += BUFFER_SIZE;
217
141
}
218
142
return buffer_capacity;
219
143
}
220
144
221
/* Add server to set of servers to retry periodically */
222
__attribute__((nonnull, warn_unused_result))
223
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
224
int af, server **current_server){
225
int ret;
226
server *new_server = malloc(sizeof(server));
227
if(new_server == NULL){
228
perror_plus("malloc");
229
return false;
230
}
231
*new_server = (server){ .ip = strdup(ip),
232
.port = port,
233
.if_index = if_index,
234
.af = af };
235
if(new_server->ip == NULL){
236
perror_plus("strdup");
237
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 = (int)TEMP_FAILURE_RETRY(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, 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
384
524
385
if(debug){
525
fprintf_plus(stderr, "Initializing GnuTLS\n");
386
fprintf(stderr, "Initializing GnuTLS\n");
526
387
}
527
388
528
389
ret = gnutls_global_init();
529
if(ret != GNUTLS_E_SUCCESS){
530
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
531
safer_gnutls_strerror(ret));
390
if (ret != GNUTLS_E_SUCCESS) {
391
fprintf (stderr, "GnuTLS global_init: %s\n",
392
safer_gnutls_strerror(ret));
532
393
return -1;
533
394
}
534
395
535
if(debug){
396
if (debug){
536
397
/* "Use a log level over 10 to enable all debugging options."
537
398
* - GnuTLS manual
538
399
*/
541
402
}
542
403
543
404
/* OpenPGP credentials */
544
ret = gnutls_certificate_allocate_credentials(&mc->cred);
545
if(ret != GNUTLS_E_SUCCESS){
546
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
547
safer_gnutls_strerror(ret));
548
gnutls_global_deinit();
405
gnutls_certificate_allocate_credentials(&mc->cred);
406
if (ret != GNUTLS_E_SUCCESS){
407
fprintf (stderr, "GnuTLS memory error: %s\n", /* Spurious
408
warning */
409
safer_gnutls_strerror(ret));
410
gnutls_global_deinit ();
549
411
return -1;
550
412
}
551
413
552
414
if(debug){
553
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
554
" secret key %s as GnuTLS credentials\n",
555
pubkeyfilename,
556
seckeyfilename);
415
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
416
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
417
seckeyfilename);
557
418
}
558
419
559
420
ret = gnutls_certificate_set_openpgp_key_file
560
421
(mc->cred, pubkeyfilename, seckeyfilename,
561
422
GNUTLS_OPENPGP_FMT_BASE64);
562
if(ret != GNUTLS_E_SUCCESS){
563
fprintf_plus(stderr,
564
"Error[%d] while reading the OpenPGP key pair ('%s',"
565
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
566
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
567
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));
568
429
goto globalfail;
569
430
}
570
431
571
432
/* GnuTLS server initialization */
572
433
ret = gnutls_dh_params_init(&mc->dh_params);
573
if(ret != GNUTLS_E_SUCCESS){
574
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
575
" initialization: %s\n",
576
safer_gnutls_strerror(ret));
577
goto globalfail;
578
}
579
/* If a Diffie-Hellman parameters file was given, try to use it */
580
if(dhparamsfilename != NULL){
581
gnutls_datum_t params = { .data = NULL, .size = 0 };
582
do {
583
int dhpfile = open(dhparamsfilename, O_RDONLY);
584
if(dhpfile == -1){
585
perror_plus("open");
586
dhparamsfilename = NULL;
587
break;
588
}
589
size_t params_capacity = 0;
590
while(true){
591
params_capacity = incbuffer((char **)¶ms.data,
592
(size_t)params.size,
593
(size_t)params_capacity);
594
if(params_capacity == 0){
595
perror_plus("incbuffer");
596
free(params.data);
597
params.data = NULL;
598
dhparamsfilename = NULL;
599
break;
600
}
601
ssize_t bytes_read = read(dhpfile,
602
params.data + params.size,
603
BUFFER_SIZE);
604
/* EOF */
605
if(bytes_read == 0){
606
break;
607
}
608
/* check bytes_read for failure */
609
if(bytes_read < 0){
610
perror_plus("read");
611
free(params.data);
612
params.data = NULL;
613
dhparamsfilename = NULL;
614
break;
615
}
616
params.size += (unsigned int)bytes_read;
617
}
618
if(params.data == NULL){
619
dhparamsfilename = NULL;
620
}
621
if(dhparamsfilename == NULL){
622
break;
623
}
624
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
625
GNUTLS_X509_FMT_PEM);
626
if(ret != GNUTLS_E_SUCCESS){
627
fprintf_plus(stderr, "Failed to parse DH parameters in file"
628
" \"%s\": %s\n", dhparamsfilename,
629
safer_gnutls_strerror(ret));
630
dhparamsfilename = NULL;
631
}
632
} while(false);
633
}
634
if(dhparamsfilename == NULL){
635
if(mc->dh_bits == 0){
636
/* Find out the optimal number of DH bits */
637
/* Try to read the private key file */
638
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
639
do {
640
int secfile = open(seckeyfilename, O_RDONLY);
641
if(secfile == -1){
642
perror_plus("open");
643
break;
644
}
645
size_t buffer_capacity = 0;
646
while(true){
647
buffer_capacity = incbuffer((char **)&buffer.data,
648
(size_t)buffer.size,
649
(size_t)buffer_capacity);
650
if(buffer_capacity == 0){
651
perror_plus("incbuffer");
652
free(buffer.data);
653
buffer.data = NULL;
654
break;
655
}
656
ssize_t bytes_read = read(secfile,
657
buffer.data + buffer.size,
658
BUFFER_SIZE);
659
/* EOF */
660
if(bytes_read == 0){
661
break;
662
}
663
/* check bytes_read for failure */
664
if(bytes_read < 0){
665
perror_plus("read");
666
free(buffer.data);
667
buffer.data = NULL;
668
break;
669
}
670
buffer.size += (unsigned int)bytes_read;
671
}
672
close(secfile);
673
} while(false);
674
/* If successful, use buffer to parse private key */
675
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
676
if(buffer.data != NULL){
677
{
678
gnutls_openpgp_privkey_t privkey = NULL;
679
ret = gnutls_openpgp_privkey_init(&privkey);
680
if(ret != GNUTLS_E_SUCCESS){
681
fprintf_plus(stderr, "Error initializing OpenPGP key"
682
" structure: %s",
683
safer_gnutls_strerror(ret));
684
free(buffer.data);
685
buffer.data = NULL;
686
} else {
687
ret = gnutls_openpgp_privkey_import
688
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
689
if(ret != GNUTLS_E_SUCCESS){
690
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
691
safer_gnutls_strerror(ret));
692
privkey = NULL;
693
}
694
free(buffer.data);
695
buffer.data = NULL;
696
if(privkey != NULL){
697
/* Use private key to suggest an appropriate
698
sec_param */
699
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
700
gnutls_openpgp_privkey_deinit(privkey);
701
if(debug){
702
fprintf_plus(stderr, "This OpenPGP key implies using"
703
" a GnuTLS security parameter \"%s\".\n",
704
safe_string(gnutls_sec_param_get_name
705
(sec_param)));
706
}
707
}
708
}
709
}
710
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
711
/* Err on the side of caution */
712
sec_param = GNUTLS_SEC_PARAM_ULTRA;
713
if(debug){
714
fprintf_plus(stderr, "Falling back to security parameter"
715
" \"%s\"\n",
716
safe_string(gnutls_sec_param_get_name
717
(sec_param)));
718
}
719
}
720
}
721
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
722
if(uret != 0){
723
mc->dh_bits = uret;
724
if(debug){
725
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
726
" implies %u DH bits; using that.\n",
727
safe_string(gnutls_sec_param_get_name
728
(sec_param)),
729
mc->dh_bits);
730
}
731
} else {
732
fprintf_plus(stderr, "Failed to get implied number of DH"
733
" bits for security parameter \"%s\"): %s\n",
734
safe_string(gnutls_sec_param_get_name
735
(sec_param)),
736
safer_gnutls_strerror(ret));
737
goto globalfail;
738
}
739
} else if(debug){
740
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
741
mc->dh_bits);
742
}
743
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
744
if(ret != GNUTLS_E_SUCCESS){
745
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
746
" bits): %s\n", mc->dh_bits,
747
safer_gnutls_strerror(ret));
748
goto globalfail;
749
}
750
}
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
751
446
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
752
447
753
448
return 0;
756
451
757
452
gnutls_certificate_free_credentials(mc->cred);
758
453
gnutls_global_deinit();
759
gnutls_dh_params_deinit(mc->dh_params);
760
454
return -1;
761
455
}
762
456
763
__attribute__((nonnull, warn_unused_result))
764
static int init_gnutls_session(gnutls_session_t *session,
765
mandos_context *mc){
457
static int init_gnutls_session(mandos_context *mc,
458
gnutls_session_t *session){
766
459
int ret;
767
460
/* GnuTLS session creation */
768
do {
769
ret = gnutls_init(session, GNUTLS_SERVER);
770
if(quit_now){
771
return -1;
772
}
773
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
774
if(ret != GNUTLS_E_SUCCESS){
775
fprintf_plus(stderr,
776
"Error in GnuTLS session initialization: %s\n",
777
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));
778
465
}
779
466
780
467
{
781
468
const char *err;
782
do {
783
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
784
if(quit_now){
785
gnutls_deinit(*session);
786
return -1;
787
}
788
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
789
if(ret != GNUTLS_E_SUCCESS){
790
fprintf_plus(stderr, "Syntax error at: %s\n", err);
791
fprintf_plus(stderr, "GnuTLS error: %s\n",
792
safer_gnutls_strerror(ret));
793
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);
794
475
return -1;
795
476
}
796
477
}
797
478
798
do {
799
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
800
mc->cred);
801
if(quit_now){
802
gnutls_deinit(*session);
803
return -1;
804
}
805
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
806
if(ret != GNUTLS_E_SUCCESS){
807
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
808
safer_gnutls_strerror(ret));
809
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);
810
485
return -1;
811
486
}
812
487
813
488
/* ignore client certificate if any. */
814
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);
815
493
816
494
return 0;
817
495
}
820
498
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
821
499
__attribute__((unused)) const char *txt){}
822
500
823
/* Set effective uid to 0, return errno */
824
__attribute__((warn_unused_result))
825
error_t raise_privileges(void){
826
error_t old_errno = errno;
827
error_t ret_errno = 0;
828
if(seteuid(0) == -1){
829
ret_errno = errno;
830
}
831
errno = old_errno;
832
return ret_errno;
833
}
834
835
/* Set effective and real user ID to 0. Return errno. */
836
__attribute__((warn_unused_result))
837
error_t raise_privileges_permanently(void){
838
error_t old_errno = errno;
839
error_t ret_errno = raise_privileges();
840
if(ret_errno != 0){
841
errno = old_errno;
842
return ret_errno;
843
}
844
if(setuid(0) == -1){
845
ret_errno = errno;
846
}
847
errno = old_errno;
848
return ret_errno;
849
}
850
851
/* Set effective user ID to unprivileged saved user ID */
852
__attribute__((warn_unused_result))
853
error_t lower_privileges(void){
854
error_t old_errno = errno;
855
error_t ret_errno = 0;
856
if(seteuid(uid) == -1){
857
ret_errno = errno;
858
}
859
errno = old_errno;
860
return ret_errno;
861
}
862
863
/* Lower privileges permanently */
864
__attribute__((warn_unused_result))
865
error_t lower_privileges_permanently(void){
866
error_t old_errno = errno;
867
error_t ret_errno = 0;
868
if(setuid(uid) == -1){
869
ret_errno = errno;
870
}
871
errno = old_errno;
872
return ret_errno;
873
}
874
875
/* Helper function to add_local_route() and delete_local_route() */
876
__attribute__((nonnull, warn_unused_result))
877
static bool add_delete_local_route(const bool add,
878
const char *address,
879
AvahiIfIndex if_index){
880
int ret;
881
char helper[] = "mandos-client-iprouteadddel";
882
char add_arg[] = "add";
883
char delete_arg[] = "delete";
884
char debug_flag[] = "--debug";
885
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
886
if(pluginhelperdir == NULL){
887
if(debug){
888
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
889
" variable not set; cannot run helper\n");
890
}
891
return false;
892
}
893
894
char interface[IF_NAMESIZE];
895
if(if_indextoname((unsigned int)if_index, interface) == NULL){
896
perror_plus("if_indextoname");
897
return false;
898
}
899
900
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
901
if(devnull == -1){
902
perror_plus("open(\"/dev/null\", O_RDONLY)");
903
return false;
904
}
905
pid_t pid = fork();
906
if(pid == 0){
907
/* Child */
908
/* Raise privileges */
909
errno = raise_privileges_permanently();
910
if(errno != 0){
911
perror_plus("Failed to raise privileges");
912
/* _exit(EX_NOPERM); */
913
} else {
914
/* Set group */
915
errno = 0;
916
ret = setgid(0);
917
if(ret == -1){
918
perror_plus("setgid");
919
_exit(EX_NOPERM);
920
}
921
/* Reset supplementary groups */
922
errno = 0;
923
ret = setgroups(0, NULL);
924
if(ret == -1){
925
perror_plus("setgroups");
926
_exit(EX_NOPERM);
927
}
928
}
929
ret = dup2(devnull, STDIN_FILENO);
930
if(ret == -1){
931
perror_plus("dup2(devnull, STDIN_FILENO)");
932
_exit(EX_OSERR);
933
}
934
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
935
if(ret == -1){
936
perror_plus("close");
937
_exit(EX_OSERR);
938
}
939
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
940
if(ret == -1){
941
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
942
_exit(EX_OSERR);
943
}
944
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
945
O_RDONLY
946
| O_DIRECTORY
947
| O_PATH
948
| O_CLOEXEC));
949
if(helperdir_fd == -1){
950
perror_plus("open");
951
_exit(EX_UNAVAILABLE);
952
}
953
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
954
helper, O_RDONLY));
955
if(helper_fd == -1){
956
perror_plus("openat");
957
_exit(EX_UNAVAILABLE);
958
}
959
TEMP_FAILURE_RETRY(close(helperdir_fd));
960
#ifdef __GNUC__
961
#pragma GCC diagnostic push
962
#pragma GCC diagnostic ignored "-Wcast-qual"
963
#endif
964
if(fexecve(helper_fd, (char *const [])
965
{ helper, add ? add_arg : delete_arg, (char *)address,
966
interface, debug ? debug_flag : NULL, NULL },
967
environ) == -1){
968
#ifdef __GNUC__
969
#pragma GCC diagnostic pop
970
#endif
971
perror_plus("fexecve");
972
_exit(EXIT_FAILURE);
973
}
974
}
975
if(pid == -1){
976
perror_plus("fork");
977
return false;
978
}
979
int status;
980
pid_t pret = -1;
981
errno = 0;
982
do {
983
pret = waitpid(pid, &status, 0);
984
if(pret == -1 and errno == EINTR and quit_now){
985
int errno_raising = 0;
986
if((errno = raise_privileges()) != 0){
987
errno_raising = errno;
988
perror_plus("Failed to raise privileges in order to"
989
" kill helper program");
990
}
991
if(kill(pid, SIGTERM) == -1){
992
perror_plus("kill");
993
}
994
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
995
perror_plus("Failed to lower privileges after killing"
996
" helper program");
997
}
998
return false;
999
}
1000
} while(pret == -1 and errno == EINTR);
1001
if(pret == -1){
1002
perror_plus("waitpid");
1003
return false;
1004
}
1005
if(WIFEXITED(status)){
1006
if(WEXITSTATUS(status) != 0){
1007
fprintf_plus(stderr, "Error: iprouteadddel exited"
1008
" with status %d\n", WEXITSTATUS(status));
1009
return false;
1010
}
1011
return true;
1012
}
1013
if(WIFSIGNALED(status)){
1014
fprintf_plus(stderr, "Error: iprouteadddel died by"
1015
" signal %d\n", WTERMSIG(status));
1016
return false;
1017
}
1018
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1019
return false;
1020
}
1021
1022
__attribute__((nonnull, warn_unused_result))
1023
static bool add_local_route(const char *address,
1024
AvahiIfIndex if_index){
1025
if(debug){
1026
fprintf_plus(stderr, "Adding route to %s\n", address);
1027
}
1028
return add_delete_local_route(true, address, if_index);
1029
}
1030
1031
__attribute__((nonnull, warn_unused_result))
1032
static bool delete_local_route(const char *address,
1033
AvahiIfIndex if_index){
1034
if(debug){
1035
fprintf_plus(stderr, "Removing route to %s\n", address);
1036
}
1037
return add_delete_local_route(false, address, if_index);
1038
}
1039
1040
501
/* Called when a Mandos server is found */
1041
__attribute__((nonnull, warn_unused_result))
1042
static int start_mandos_communication(const char *ip, in_port_t port,
502
static int start_mandos_communication(const char *ip, uint16_t port,
1043
503
AvahiIfIndex if_index,
1044
int af, mandos_context *mc){
1045
int ret, tcp_sd = -1;
1046
ssize_t sret;
1047
struct sockaddr_storage to;
504
mandos_context *mc){
505
int ret, tcp_sd;
506
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
1048
507
char *buffer = NULL;
1049
char *decrypted_buffer = NULL;
508
char *decrypted_buffer;
1050
509
size_t buffer_length = 0;
1051
510
size_t buffer_capacity = 0;
511
ssize_t decrypted_buffer_size;
1052
512
size_t written;
1053
int retval = -1;
513
int retval = 0;
514
char interface[IF_NAMESIZE];
1054
515
gnutls_session_t session;
1055
int pf; /* Protocol family */
1056
bool route_added = false;
1057
1058
errno = 0;
1059
1060
if(quit_now){
1061
errno = EINTR;
1062
return -1;
1063
}
1064
1065
switch(af){
1066
case AF_INET6:
1067
pf = PF_INET6;
1068
break;
1069
case AF_INET:
1070
pf = PF_INET;
1071
break;
1072
default:
1073
fprintf_plus(stderr, "Bad address family: %d\n", af);
1074
errno = EINVAL;
1075
return -1;
1076
}
1077
1078
/* If the interface is specified and we have a list of interfaces */
1079
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1080
/* Check if the interface is one of the interfaces we are using */
1081
bool match = false;
1082
{
1083
char *interface = NULL;
1084
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1085
interface))){
1086
if(if_nametoindex(interface) == (unsigned int)if_index){
1087
match = true;
1088
break;
1089
}
1090
}
1091
}
1092
if(not match){
1093
/* This interface does not match any in the list, so we don't
1094
connect to the server */
1095
if(debug){
1096
char interface[IF_NAMESIZE];
1097
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1098
perror_plus("if_indextoname");
1099
} else {
1100
fprintf_plus(stderr, "Skipping server on non-used interface"
1101
" \"%s\"\n",
1102
if_indextoname((unsigned int)if_index,
1103
interface));
1104
}
1105
}
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");
1106
536
return -1;
1107
537
}
1108
}
1109
1110
ret = init_gnutls_session(&session, mc);
1111
if(ret != 0){
1112
return -1;
1113
}
1114
1115
if(debug){
1116
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1117
PRIuMAX "\n", ip, (uintmax_t)port);
1118
}
1119
1120
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
1121
if(tcp_sd < 0){
1122
int e = errno;
1123
perror_plus("socket");
1124
errno = e;
1125
goto mandos_end;
1126
}
1127
1128
if(quit_now){
1129
errno = EINTR;
1130
goto mandos_end;
538
fprintf(stderr, "Binding to interface %s\n", interface);
1131
539
}
1132
540
1133
541
memset(&to, 0, sizeof(to));
1134
if(af == AF_INET6){
1135
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
1136
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
1137
} else { /* IPv4 */
1138
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
1139
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
1140
}
1141
if(ret < 0 ){
1142
int e = errno;
1143
perror_plus("inet_pton");
1144
errno = e;
1145
goto mandos_end;
542
to.in6.sin6_family = AF_INET6;
543
/* It would be nice to have a way to detect if we were passed an
544
IPv4 address here. Now we assume an IPv6 address. */
545
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
546
if (ret < 0 ){
547
perror("inet_pton");
548
return -1;
1146
549
}
1147
550
if(ret == 0){
1148
int e = errno;
1149
fprintf_plus(stderr, "Bad address: %s\n", ip);
1150
errno = e;
1151
goto mandos_end;
1152
}
1153
if(af == AF_INET6){
1154
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1155
if(IN6_IS_ADDR_LINKLOCAL
1156
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
1157
if(if_index == AVAHI_IF_UNSPEC){
1158
fprintf_plus(stderr, "An IPv6 link-local address is"
1159
" incomplete without a network interface\n");
1160
errno = EINVAL;
1161
goto mandos_end;
1162
}
1163
/* Set the network interface number as scope */
1164
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
1165
}
1166
} else {
1167
((struct sockaddr_in *)&to)->sin_port = htons(port);
1168
}
551
fprintf(stderr, "Bad address: %s\n", ip);
552
return -1;
553
}
554
to.in6.sin6_port = htons(port); /* Spurious warning */
1169
555
1170
if(quit_now){
1171
errno = EINTR;
1172
goto mandos_end;
1173
}
556
to.in6.sin6_scope_id = (uint32_t)if_index;
1174
557
1175
558
if(debug){
1176
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
1177
char interface[IF_NAMESIZE];
1178
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1179
perror_plus("if_indextoname");
1180
} else {
1181
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1182
"\n", ip, interface, (uintmax_t)port);
1183
}
1184
} else {
1185
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1186
ip, (uintmax_t)port);
1187
}
1188
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1189
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1190
if(af == AF_INET6){
1191
ret = getnameinfo((struct sockaddr *)&to,
1192
sizeof(struct sockaddr_in6),
1193
addrstr, sizeof(addrstr), NULL, 0,
1194
NI_NUMERICHOST);
1195
} else {
1196
ret = getnameinfo((struct sockaddr *)&to,
1197
sizeof(struct sockaddr_in),
1198
addrstr, sizeof(addrstr), NULL, 0,
1199
NI_NUMERICHOST);
1200
}
1201
if(ret == EAI_SYSTEM){
1202
perror_plus("getnameinfo");
1203
} else if(ret != 0) {
1204
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1205
} else if(strcmp(addrstr, ip) != 0){
1206
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1207
}
1208
}
1209
1210
if(quit_now){
1211
errno = EINTR;
1212
goto mandos_end;
1213
}
1214
1215
while(true){
1216
if(af == AF_INET6){
1217
ret = connect(tcp_sd, (struct sockaddr *)&to,
1218
sizeof(struct sockaddr_in6));
1219
} else {
1220
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1221
sizeof(struct sockaddr_in));
1222
}
1223
if(ret < 0){
1224
if(errno == ENETUNREACH
1225
and if_index != AVAHI_IF_UNSPEC
1226
and connect_to == NULL
1227
and not route_added and
1228
((af == AF_INET6 and not
1229
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1230
&to)->sin6_addr)))
1231
or (af == AF_INET and
1232
/* Not a a IPv4LL address */
1233
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1234
& 0xFFFF0000L) != 0xA9FE0000L))){
1235
/* Work around Avahi bug - Avahi does not announce link-local
1236
addresses if it has a global address, so local hosts with
1237
*only* a link-local address (e.g. Mandos clients) cannot
1238
connect to a Mandos server announced by Avahi on a server
1239
host with a global address. Work around this by retrying
1240
with an explicit route added with the server's address.
1241
1242
Avahi bug reference:
1243
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1244
https://bugs.debian.org/587961
1245
*/
1246
if(debug){
1247
fprintf_plus(stderr, "Mandos server unreachable, trying"
1248
" direct route\n");
1249
}
1250
int e = errno;
1251
route_added = add_local_route(ip, if_index);
1252
if(route_added){
1253
continue;
1254
}
1255
errno = e;
1256
}
1257
if(errno != ECONNREFUSED or debug){
1258
int e = errno;
1259
perror_plus("connect");
1260
errno = e;
1261
}
1262
goto mandos_end;
1263
}
1264
1265
if(quit_now){
1266
errno = EINTR;
1267
goto mandos_end;
1268
}
1269
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;
1270
576
}
1271
577
1272
578
const char *out = mandos_protocol_version;
1273
579
written = 0;
1274
while(true){
580
while (true){
1275
581
size_t out_size = strlen(out);
1276
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
1277
out_size - written));
1278
if(ret == -1){
1279
int e = errno;
1280
perror_plus("write");
1281
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;
1282
587
goto mandos_end;
1283
588
}
1284
589
written += (size_t)ret;
1285
590
if(written < out_size){
1286
591
continue;
1287
592
} else {
1288
if(out == mandos_protocol_version){
593
if (out == mandos_protocol_version){
1289
594
written = 0;
1290
595
out = "\r\n";
1291
596
} else {
1292
597
break;
1293
598
}
1294
599
}
1295
1296
if(quit_now){
1297
errno = EINTR;
1298
goto mandos_end;
1299
}
1300
600
}
1301
601
1302
602
if(debug){
1303
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
1304
}
1305
1306
if(quit_now){
1307
errno = EINTR;
1308
goto mandos_end;
1309
}
1310
1311
/* This casting via intptr_t is to eliminate warning about casting
1312
an int to a pointer type. This is exactly how the GnuTLS Guile
1313
function "set-session-transport-fd!" does it. */
1314
gnutls_transport_set_ptr(session,
1315
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
1316
1317
if(quit_now){
1318
errno = EINTR;
1319
goto mandos_end;
1320
}
1321
1322
do {
1323
ret = gnutls_handshake(session);
1324
if(quit_now){
1325
errno = EINTR;
1326
goto mandos_end;
1327
}
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);
1328
610
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1329
611
1330
if(ret != GNUTLS_E_SUCCESS){
612
if (ret != GNUTLS_E_SUCCESS){
1331
613
if(debug){
1332
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
1333
gnutls_perror(ret);
614
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
615
gnutls_perror (ret);
1334
616
}
1335
errno = EPROTO;
617
retval = -1;
1336
618
goto mandos_end;
1337
619
}
1338
620
1339
621
/* Read OpenPGP packet that contains the wanted password */
1340
622
1341
623
if(debug){
1342
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1343
" %s\n", ip);
624
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
625
ip);
1344
626
}
1345
627
1346
628
while(true){
1347
1348
if(quit_now){
1349
errno = EINTR;
1350
goto mandos_end;
1351
}
1352
1353
buffer_capacity = incbuffer(&buffer, buffer_length,
1354
buffer_capacity);
1355
if(buffer_capacity == 0){
1356
int e = errno;
1357
perror_plus("incbuffer");
1358
errno = e;
1359
goto mandos_end;
1360
}
1361
1362
if(quit_now){
1363
errno = EINTR;
1364
goto mandos_end;
1365
}
1366
1367
sret = gnutls_record_recv(session, buffer+buffer_length,
1368
BUFFER_SIZE);
1369
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){
1370
640
break;
1371
641
}
1372
if(sret < 0){
1373
switch(sret){
642
if (ret < 0){
643
switch(ret){
1374
644
case GNUTLS_E_INTERRUPTED:
1375
645
case GNUTLS_E_AGAIN:
1376
646
break;
1377
647
case GNUTLS_E_REHANDSHAKE:
1378
do {
1379
ret = gnutls_handshake(session);
1380
1381
if(quit_now){
1382
errno = EINTR;
1383
goto mandos_end;
1384
}
648
do{
649
ret = gnutls_handshake (session);
1385
650
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1386
if(ret < 0){
1387
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1388
"***\n");
1389
gnutls_perror(ret);
1390
errno = EPROTO;
651
if (ret < 0){
652
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
653
gnutls_perror (ret);
654
retval = -1;
1391
655
goto mandos_end;
1392
656
}
1393
657
break;
1394
658
default:
1395
fprintf_plus(stderr, "Unknown error while reading data from"
1396
" encrypted session with Mandos server\n");
1397
gnutls_bye(session, GNUTLS_SHUT_RDWR);
1398
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);
1399
663
goto mandos_end;
1400
664
}
1401
665
} else {
1402
buffer_length += (size_t) sret;
666
buffer_length += (size_t) ret;
1403
667
}
1404
668
}
1405
669
1406
670
if(debug){
1407
fprintf_plus(stderr, "Closing TLS session\n");
1408
}
1409
1410
if(quit_now){
1411
errno = EINTR;
1412
goto mandos_end;
1413
}
1414
1415
do {
1416
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
1417
if(quit_now){
1418
errno = EINTR;
1419
goto mandos_end;
1420
}
1421
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1422
1423
if(buffer_length > 0){
1424
ssize_t decrypted_buffer_size;
1425
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1426
&decrypted_buffer, mc);
1427
if(decrypted_buffer_size >= 0){
1428
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){
1429
681
written = 0;
1430
682
while(written < (size_t) decrypted_buffer_size){
1431
if(quit_now){
1432
errno = EINTR;
1433
goto mandos_end;
1434
}
1435
1436
ret = (int)fwrite(decrypted_buffer + written, 1,
1437
(size_t)decrypted_buffer_size - written,
1438
stdout);
683
ret = (int)fwrite (decrypted_buffer + written, 1,
684
(size_t)decrypted_buffer_size - written,
685
stdout);
1439
686
if(ret == 0 and ferror(stdout)){
1440
int e = errno;
1441
687
if(debug){
1442
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1443
strerror(errno));
688
fprintf(stderr, "Error writing encrypted data: %s\n",
689
strerror(errno));
1444
690
}
1445
errno = e;
1446
goto mandos_end;
691
retval = -1;
692
break;
1447
693
}
1448
694
written += (size_t)ret;
1449
695
}
1450
retval = 0;
696
free(decrypted_buffer);
697
} else {
698
retval = -1;
1451
699
}
700
} else {
701
retval = -1;
1452
702
}
1453
703
1454
704
/* Shutdown procedure */
1455
705
1456
706
mandos_end:
1457
{
1458
if(route_added){
1459
if(not delete_local_route(ip, if_index)){
1460
fprintf_plus(stderr, "Failed to delete local route to %s on"
1461
" interface %d", ip, if_index);
1462
}
1463
}
1464
int e = errno;
1465
free(decrypted_buffer);
1466
free(buffer);
1467
if(tcp_sd >= 0){
1468
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1469
}
1470
if(ret == -1){
1471
if(e == 0){
1472
e = errno;
1473
}
1474
perror_plus("close");
1475
}
1476
gnutls_deinit(session);
1477
errno = e;
1478
if(quit_now){
1479
errno = EINTR;
1480
retval = -1;
1481
}
707
free(buffer);
708
ret = TEMP_FAILURE_RETRY(close(tcp_sd));
709
if(ret == -1){
710
perror("close");
1482
711
}
712
gnutls_deinit (session);
1483
713
return retval;
1484
714
}
1485
715
1486
__attribute__((nonnull))
1487
716
static void resolve_callback(AvahiSServiceResolver *r,
1488
717
AvahiIfIndex interface,
1489
AvahiProtocol proto,
718
AVAHI_GCC_UNUSED AvahiProtocol protocol,
1490
719
AvahiResolverEvent event,
1491
720
const char *name,
1492
721
const char *type,
1497
726
AVAHI_GCC_UNUSED AvahiStringList *txt,
1498
727
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1499
728
flags,
1500
void *mc){
1501
if(r == NULL){
1502
return;
1503
}
729
void* userdata) {
730
mandos_context *mc = userdata;
731
assert(r);
1504
732
1505
733
/* Called whenever a service has been resolved successfully or
1506
734
timed out */
1507
735
1508
if(quit_now){
1509
avahi_s_service_resolver_free(r);
1510
return;
1511
}
1512
1513
switch(event){
736
switch (event) {
1514
737
default:
1515
738
case AVAHI_RESOLVER_FAILURE:
1516
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1517
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1518
domain,
1519
avahi_strerror(avahi_server_errno
1520
(((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)));
1521
742
break;
1522
743
1523
744
case AVAHI_RESOLVER_FOUND:
1525
746
char ip[AVAHI_ADDRESS_STR_MAX];
1526
747
avahi_address_snprint(ip, sizeof(ip), address);
1527
748
if(debug){
1528
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1529
PRIdMAX ") on port %" PRIu16 "\n", name,
1530
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);
1531
752
}
1532
int ret = start_mandos_communication(ip, (in_port_t)port,
1533
interface,
1534
avahi_proto_to_af(proto),
1535
mc);
1536
if(ret == 0){
1537
avahi_simple_poll_quit(simple_poll);
1538
} else {
1539
if(not add_server(ip, (in_port_t)port, interface,
1540
avahi_proto_to_af(proto),
1541
&((mandos_context*)mc)->current_server)){
1542
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1543
" list\n", name);
1544
}
753
int ret = start_mandos_communication(ip, port, interface, mc);
754
if (ret == 0){
755
avahi_simple_poll_quit(mc->simple_poll);
1545
756
}
1546
757
}
1547
758
}
1548
759
avahi_s_service_resolver_free(r);
1549
760
}
1550
761
1551
static void browse_callback(AvahiSServiceBrowser *b,
1552
AvahiIfIndex interface,
1553
AvahiProtocol protocol,
1554
AvahiBrowserEvent event,
1555
const char *name,
1556
const char *type,
1557
const char *domain,
1558
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1559
flags,
1560
void *mc){
1561
if(b == NULL){
1562
return;
1563
}
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);
1564
774
1565
775
/* Called whenever a new services becomes available on the LAN or
1566
776
is removed from the LAN */
1567
777
1568
if(quit_now){
1569
return;
1570
}
1571
1572
switch(event){
778
switch (event) {
1573
779
default:
1574
780
case AVAHI_BROWSER_FAILURE:
1575
781
1576
fprintf_plus(stderr, "(Avahi browser) %s\n",
1577
avahi_strerror(avahi_server_errno
1578
(((mandos_context*)mc)->server)));
1579
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);
1580
785
return;
1581
786
1582
787
case AVAHI_BROWSER_NEW:
1585
790
the callback function is called the Avahi server will free the
1586
791
resolver for us. */
1587
792
1588
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1589
interface, protocol, name, type,
1590
domain, protocol, 0,
1591
resolve_callback, mc) == NULL)
1592
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1593
" %s\n", name,
1594
avahi_strerror(avahi_server_errno
1595
(((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)));
1596
799
break;
1597
800
1598
801
case AVAHI_BROWSER_REMOVE:
1601
804
case AVAHI_BROWSER_ALL_FOR_NOW:
1602
805
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1603
806
if(debug){
1604
fprintf_plus(stderr, "No Mandos server found, still"
1605
" searching...\n");
807
fprintf(stderr, "No Mandos server found, still searching...\n");
1606
808
}
1607
809
break;
1608
810
}
1609
811
}
1610
812
1611
/* Signal handler that stops main loop after SIGTERM */
1612
static void handle_sigterm(int sig){
1613
if(quit_now){
1614
return;
1615
}
1616
quit_now = 1;
1617
signal_received = sig;
1618
int old_errno = errno;
1619
/* set main loop to exit */
1620
if(simple_poll != NULL){
1621
avahi_simple_poll_quit(simple_poll);
1622
}
1623
errno = old_errno;
1624
}
1625
1626
__attribute__((nonnull, warn_unused_result))
1627
bool get_flags(const char *ifname, struct ifreq *ifr){
1628
int ret;
1629
error_t ret_errno;
1630
1631
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1632
if(s < 0){
1633
ret_errno = errno;
1634
perror_plus("socket");
1635
errno = ret_errno;
1636
return false;
1637
}
1638
strcpy(ifr->ifr_name, ifname);
1639
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1640
if(ret == -1){
1641
if(debug){
1642
ret_errno = errno;
1643
perror_plus("ioctl SIOCGIFFLAGS");
1644
errno = ret_errno;
1645
}
1646
return false;
1647
}
1648
return true;
1649
}
1650
1651
__attribute__((nonnull, warn_unused_result))
1652
bool good_flags(const char *ifname, const struct ifreq *ifr){
1653
1654
/* Reject the loopback device */
1655
if(ifr->ifr_flags & IFF_LOOPBACK){
1656
if(debug){
1657
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1658
ifname);
1659
}
1660
return false;
1661
}
1662
/* Accept point-to-point devices only if connect_to is specified */
1663
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1664
if(debug){
1665
fprintf_plus(stderr, "Accepting point-to-point interface"
1666
" \"%s\"\n", ifname);
1667
}
1668
return true;
1669
}
1670
/* Otherwise, reject non-broadcast-capable devices */
1671
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1672
if(debug){
1673
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1674
" \"%s\"\n", ifname);
1675
}
1676
return false;
1677
}
1678
/* Reject non-ARP interfaces (including dummy interfaces) */
1679
if(ifr->ifr_flags & IFF_NOARP){
1680
if(debug){
1681
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1682
ifname);
1683
}
1684
return false;
1685
}
1686
1687
/* Accept this device */
1688
if(debug){
1689
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1690
}
1691
return true;
1692
}
1693
1694
/*
1695
* This function determines if a directory entry in /sys/class/net
1696
* corresponds to an acceptable network device.
1697
* (This function is passed to scandir(3) as a filter function.)
1698
*/
1699
__attribute__((nonnull, warn_unused_result))
1700
int good_interface(const struct dirent *if_entry){
1701
if(if_entry->d_name[0] == '.'){
1702
return 0;
1703
}
1704
1705
struct ifreq ifr;
1706
if(not get_flags(if_entry->d_name, &ifr)){
1707
if(debug){
1708
fprintf_plus(stderr, "Failed to get flags for interface "
1709
"\"%s\"\n", if_entry->d_name);
1710
}
1711
return 0;
1712
}
1713
1714
if(not good_flags(if_entry->d_name, &ifr)){
1715
return 0;
1716
}
1717
return 1;
1718
}
1719
1720
/*
1721
* This function determines if a network interface is up.
1722
*/
1723
__attribute__((nonnull, warn_unused_result))
1724
bool interface_is_up(const char *interface){
1725
struct ifreq ifr;
1726
if(not get_flags(interface, &ifr)){
1727
if(debug){
1728
fprintf_plus(stderr, "Failed to get flags for interface "
1729
"\"%s\"\n", interface);
1730
}
1731
return false;
1732
}
1733
1734
return (bool)(ifr.ifr_flags & IFF_UP);
1735
}
1736
1737
/*
1738
* This function determines if a network interface is running
1739
*/
1740
__attribute__((nonnull, warn_unused_result))
1741
bool interface_is_running(const char *interface){
1742
struct ifreq ifr;
1743
if(not get_flags(interface, &ifr)){
1744
if(debug){
1745
fprintf_plus(stderr, "Failed to get flags for interface "
1746
"\"%s\"\n", interface);
1747
}
1748
return false;
1749
}
1750
1751
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1752
}
1753
1754
__attribute__((nonnull, pure, warn_unused_result))
1755
int notdotentries(const struct dirent *direntry){
1756
/* Skip "." and ".." */
1757
if(direntry->d_name[0] == '.'
1758
and (direntry->d_name[1] == '\0'
1759
or (direntry->d_name[1] == '.'
1760
and direntry->d_name[2] == '\0'))){
1761
return 0;
1762
}
1763
return 1;
1764
}
1765
1766
/* Is this directory entry a runnable program? */
1767
__attribute__((nonnull, warn_unused_result))
1768
int runnable_hook(const struct dirent *direntry){
1769
int ret;
1770
size_t sret;
1771
struct stat st;
1772
1773
if((direntry->d_name)[0] == '\0'){
1774
/* Empty name? */
1775
return 0;
1776
}
1777
1778
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1779
"abcdefghijklmnopqrstuvwxyz"
1780
"0123456789"
1781
"_.-");
1782
if((direntry->d_name)[sret] != '\0'){
1783
/* Contains non-allowed characters */
1784
if(debug){
1785
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1786
direntry->d_name);
1787
}
1788
return 0;
1789
}
1790
1791
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1792
if(ret == -1){
1793
if(debug){
1794
perror_plus("Could not stat hook");
1795
}
1796
return 0;
1797
}
1798
if(not (S_ISREG(st.st_mode))){
1799
/* Not a regular file */
1800
if(debug){
1801
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1802
direntry->d_name);
1803
}
1804
return 0;
1805
}
1806
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1807
/* Not executable */
1808
if(debug){
1809
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1810
direntry->d_name);
1811
}
1812
return 0;
1813
}
1814
if(debug){
1815
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1816
direntry->d_name);
1817
}
1818
return 1;
1819
}
1820
1821
__attribute__((nonnull, warn_unused_result))
1822
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1823
mandos_context *mc){
1824
int ret;
1825
struct timespec now;
1826
struct timespec waited_time;
1827
intmax_t block_time;
1828
1829
while(true){
1830
if(mc->current_server == NULL){
1831
if(debug){
1832
fprintf_plus(stderr, "Wait until first server is found."
1833
" No timeout!\n");
1834
}
1835
ret = avahi_simple_poll_iterate(s, -1);
1836
} else {
1837
if(debug){
1838
fprintf_plus(stderr, "Check current_server if we should run"
1839
" it, or wait\n");
1840
}
1841
/* the current time */
1842
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1843
if(ret == -1){
1844
perror_plus("clock_gettime");
1845
return -1;
1846
}
1847
/* Calculating in ms how long time between now and server
1848
who we visted longest time ago. Now - last seen. */
1849
waited_time.tv_sec = (now.tv_sec
1850
- mc->current_server->last_seen.tv_sec);
1851
waited_time.tv_nsec = (now.tv_nsec
1852
- mc->current_server->last_seen.tv_nsec);
1853
/* total time is 10s/10,000ms.
1854
Converting to s from ms by dividing by 1,000,
1855
and ns to ms by dividing by 1,000,000. */
1856
block_time = ((retry_interval
1857
- ((intmax_t)waited_time.tv_sec * 1000))
1858
- ((intmax_t)waited_time.tv_nsec / 1000000));
1859
1860
if(debug){
1861
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1862
block_time);
1863
}
1864
1865
if(block_time <= 0){
1866
ret = start_mandos_communication(mc->current_server->ip,
1867
mc->current_server->port,
1868
mc->current_server->if_index,
1869
mc->current_server->af, mc);
1870
if(ret == 0){
1871
avahi_simple_poll_quit(s);
1872
return 0;
1873
}
1874
ret = clock_gettime(CLOCK_MONOTONIC,
1875
&mc->current_server->last_seen);
1876
if(ret == -1){
1877
perror_plus("clock_gettime");
1878
return -1;
1879
}
1880
mc->current_server = mc->current_server->next;
1881
block_time = 0; /* Call avahi to find new Mandos
1882
servers, but don't block */
1883
}
1884
1885
ret = avahi_simple_poll_iterate(s, (int)block_time);
1886
}
1887
if(ret != 0){
1888
if(ret > 0 or errno != EINTR){
1889
return (ret != 1) ? ret : 0;
1890
}
1891
}
1892
}
1893
}
1894
1895
__attribute__((nonnull))
1896
void run_network_hooks(const char *mode, const char *interface,
1897
const float delay){
1898
struct dirent **direntries = NULL;
1899
if(hookdir_fd == -1){
1900
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1901
| O_CLOEXEC);
1902
if(hookdir_fd == -1){
1903
if(errno == ENOENT){
1904
if(debug){
1905
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1906
" found\n", hookdir);
1907
}
1908
} else {
1909
perror_plus("open");
1910
}
1911
return;
1912
}
1913
}
1914
#ifdef __GLIBC__
1915
#if __GLIBC_PREREQ(2, 15)
1916
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1917
runnable_hook, alphasort);
1918
#else /* not __GLIBC_PREREQ(2, 15) */
1919
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1920
alphasort);
1921
#endif /* not __GLIBC_PREREQ(2, 15) */
1922
#else /* not __GLIBC__ */
1923
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1924
alphasort);
1925
#endif /* not __GLIBC__ */
1926
if(numhooks == -1){
1927
perror_plus("scandir");
1928
return;
1929
}
1930
struct dirent *direntry;
1931
int ret;
1932
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1933
if(devnull == -1){
1934
perror_plus("open(\"/dev/null\", O_RDONLY)");
1935
return;
1936
}
1937
for(int i = 0; i < numhooks; i++){
1938
direntry = direntries[i];
1939
if(debug){
1940
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1941
direntry->d_name);
1942
}
1943
pid_t hook_pid = fork();
1944
if(hook_pid == 0){
1945
/* Child */
1946
/* Raise privileges */
1947
errno = raise_privileges_permanently();
1948
if(errno != 0){
1949
perror_plus("Failed to raise privileges");
1950
_exit(EX_NOPERM);
1951
}
1952
/* Set group */
1953
errno = 0;
1954
ret = setgid(0);
1955
if(ret == -1){
1956
perror_plus("setgid");
1957
_exit(EX_NOPERM);
1958
}
1959
/* Reset supplementary groups */
1960
errno = 0;
1961
ret = setgroups(0, NULL);
1962
if(ret == -1){
1963
perror_plus("setgroups");
1964
_exit(EX_NOPERM);
1965
}
1966
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1967
if(ret == -1){
1968
perror_plus("setenv");
1969
_exit(EX_OSERR);
1970
}
1971
ret = setenv("DEVICE", interface, 1);
1972
if(ret == -1){
1973
perror_plus("setenv");
1974
_exit(EX_OSERR);
1975
}
1976
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1977
if(ret == -1){
1978
perror_plus("setenv");
1979
_exit(EX_OSERR);
1980
}
1981
ret = setenv("MODE", mode, 1);
1982
if(ret == -1){
1983
perror_plus("setenv");
1984
_exit(EX_OSERR);
1985
}
1986
char *delaystring;
1987
ret = asprintf(&delaystring, "%f", (double)delay);
1988
if(ret == -1){
1989
perror_plus("asprintf");
1990
_exit(EX_OSERR);
1991
}
1992
ret = setenv("DELAY", delaystring, 1);
1993
if(ret == -1){
1994
free(delaystring);
1995
perror_plus("setenv");
1996
_exit(EX_OSERR);
1997
}
1998
free(delaystring);
1999
if(connect_to != NULL){
2000
ret = setenv("CONNECT", connect_to, 1);
2001
if(ret == -1){
2002
perror_plus("setenv");
2003
_exit(EX_OSERR);
2004
}
2005
}
2006
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2007
direntry->d_name,
2008
O_RDONLY));
2009
if(hook_fd == -1){
2010
perror_plus("openat");
2011
_exit(EXIT_FAILURE);
2012
}
2013
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2014
perror_plus("close");
2015
_exit(EXIT_FAILURE);
2016
}
2017
ret = dup2(devnull, STDIN_FILENO);
2018
if(ret == -1){
2019
perror_plus("dup2(devnull, STDIN_FILENO)");
2020
_exit(EX_OSERR);
2021
}
2022
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
2023
if(ret == -1){
2024
perror_plus("close");
2025
_exit(EX_OSERR);
2026
}
2027
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2028
if(ret == -1){
2029
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2030
_exit(EX_OSERR);
2031
}
2032
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2033
environ) == -1){
2034
perror_plus("fexecve");
2035
_exit(EXIT_FAILURE);
2036
}
2037
} else {
2038
if(hook_pid == -1){
2039
perror_plus("fork");
2040
free(direntry);
2041
continue;
2042
}
2043
int status;
2044
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2045
perror_plus("waitpid");
2046
free(direntry);
2047
continue;
2048
}
2049
if(WIFEXITED(status)){
2050
if(WEXITSTATUS(status) != 0){
2051
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2052
" with status %d\n", direntry->d_name,
2053
WEXITSTATUS(status));
2054
free(direntry);
2055
continue;
2056
}
2057
} else if(WIFSIGNALED(status)){
2058
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2059
" signal %d\n", direntry->d_name,
2060
WTERMSIG(status));
2061
free(direntry);
2062
continue;
2063
} else {
2064
fprintf_plus(stderr, "Warning: network hook \"%s\""
2065
" crashed\n", direntry->d_name);
2066
free(direntry);
2067
continue;
2068
}
2069
}
2070
if(debug){
2071
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2072
direntry->d_name);
2073
}
2074
free(direntry);
2075
}
2076
free(direntries);
2077
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2078
perror_plus("close");
2079
} else {
2080
hookdir_fd = -1;
2081
}
2082
close(devnull);
2083
}
2084
2085
__attribute__((nonnull, warn_unused_result))
2086
error_t bring_up_interface(const char *const interface,
2087
const float delay){
2088
error_t old_errno = errno;
2089
int ret;
2090
struct ifreq network;
2091
unsigned int if_index = if_nametoindex(interface);
2092
if(if_index == 0){
2093
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2094
errno = old_errno;
2095
return ENXIO;
2096
}
2097
2098
if(quit_now){
2099
errno = old_errno;
2100
return EINTR;
2101
}
2102
2103
if(not interface_is_up(interface)){
2104
error_t ret_errno = 0, ioctl_errno = 0;
2105
if(not get_flags(interface, &network)){
2106
ret_errno = errno;
2107
fprintf_plus(stderr, "Failed to get flags for interface "
2108
"\"%s\"\n", interface);
2109
errno = old_errno;
2110
return ret_errno;
2111
}
2112
network.ifr_flags |= IFF_UP; /* set flag */
2113
2114
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2115
if(sd == -1){
2116
ret_errno = errno;
2117
perror_plus("socket");
2118
errno = old_errno;
2119
return ret_errno;
2120
}
2121
2122
if(quit_now){
2123
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2124
if(ret == -1){
2125
perror_plus("close");
2126
}
2127
errno = old_errno;
2128
return EINTR;
2129
}
2130
2131
if(debug){
2132
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2133
interface);
2134
}
2135
2136
/* Raise privileges */
2137
ret_errno = raise_privileges();
2138
if(ret_errno != 0){
2139
errno = ret_errno;
2140
perror_plus("Failed to raise privileges");
2141
}
2142
2143
#ifdef __linux__
2144
int ret_linux;
2145
bool restore_loglevel = false;
2146
if(ret_errno == 0){
2147
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2148
messages about the network interface to mess up the prompt */
2149
ret_linux = klogctl(8, NULL, 5);
2150
if(ret_linux == -1){
2151
perror_plus("klogctl");
2152
} else {
2153
restore_loglevel = true;
2154
}
2155
}
2156
#endif /* __linux__ */
2157
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2158
ioctl_errno = errno;
2159
#ifdef __linux__
2160
if(restore_loglevel){
2161
ret_linux = klogctl(7, NULL, 0);
2162
if(ret_linux == -1){
2163
perror_plus("klogctl");
2164
}
2165
}
2166
#endif /* __linux__ */
2167
2168
/* If raise_privileges() succeeded above */
2169
if(ret_errno == 0){
2170
/* Lower privileges */
2171
ret_errno = lower_privileges();
2172
if(ret_errno != 0){
2173
errno = ret_errno;
2174
perror_plus("Failed to lower privileges");
2175
}
2176
}
2177
2178
/* Close the socket */
2179
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2180
if(ret == -1){
2181
perror_plus("close");
2182
}
2183
2184
if(ret_setflags == -1){
2185
errno = ioctl_errno;
2186
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2187
errno = old_errno;
2188
return ioctl_errno;
2189
}
2190
} else if(debug){
2191
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2192
interface);
2193
}
2194
2195
/* Sleep checking until interface is running.
2196
Check every 0.25s, up to total time of delay */
2197
for(int i=0; i < delay * 4; i++){
2198
if(interface_is_running(interface)){
2199
break;
2200
}
2201
struct timespec sleeptime = { .tv_nsec = 250000000 };
2202
ret = nanosleep(&sleeptime, NULL);
2203
if(ret == -1 and errno != EINTR){
2204
perror_plus("nanosleep");
2205
}
2206
}
2207
2208
errno = old_errno;
2209
return 0;
2210
}
2211
2212
__attribute__((nonnull, warn_unused_result))
2213
error_t take_down_interface(const char *const interface){
2214
error_t old_errno = errno;
2215
struct ifreq network;
2216
unsigned int if_index = if_nametoindex(interface);
2217
if(if_index == 0){
2218
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2219
errno = old_errno;
2220
return ENXIO;
2221
}
2222
if(interface_is_up(interface)){
2223
error_t ret_errno = 0, ioctl_errno = 0;
2224
if(not get_flags(interface, &network) and debug){
2225
ret_errno = errno;
2226
fprintf_plus(stderr, "Failed to get flags for interface "
2227
"\"%s\"\n", interface);
2228
errno = old_errno;
2229
return ret_errno;
2230
}
2231
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2232
2233
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2234
if(sd == -1){
2235
ret_errno = errno;
2236
perror_plus("socket");
2237
errno = old_errno;
2238
return ret_errno;
2239
}
2240
2241
if(debug){
2242
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2243
interface);
2244
}
2245
2246
/* Raise privileges */
2247
ret_errno = raise_privileges();
2248
if(ret_errno != 0){
2249
errno = ret_errno;
2250
perror_plus("Failed to raise privileges");
2251
}
2252
2253
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2254
ioctl_errno = errno;
2255
2256
/* If raise_privileges() succeeded above */
2257
if(ret_errno == 0){
2258
/* Lower privileges */
2259
ret_errno = lower_privileges();
2260
if(ret_errno != 0){
2261
errno = ret_errno;
2262
perror_plus("Failed to lower privileges");
2263
}
2264
}
2265
2266
/* Close the socket */
2267
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2268
if(ret == -1){
2269
perror_plus("close");
2270
}
2271
2272
if(ret_setflags == -1){
2273
errno = ioctl_errno;
2274
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2275
errno = old_errno;
2276
return ioctl_errno;
2277
}
2278
} else if(debug){
2279
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2280
interface);
2281
}
2282
2283
errno = old_errno;
2284
return 0;
2285
}
2286
2287
813
int main(int argc, char *argv[]){
2288
mandos_context mc = { .server = NULL, .dh_bits = 0,
2289
.priority = "SECURE256:!CTYPE-X.509:"
2290
"+CTYPE-OPENPGP:!RSA", .current_server = NULL,
2291
.interfaces = NULL, .interfaces_size = 0 };
2292
AvahiSServiceBrowser *sb = NULL;
2293
error_t ret_errno;
2294
int ret;
2295
intmax_t tmpmax;
2296
char *tmp;
2297
int exitcode = EXIT_SUCCESS;
2298
char *interfaces_to_take_down = NULL;
2299
size_t interfaces_to_take_down_size = 0;
2300
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2301
char old_tempdir[] = "/tmp/mandosXXXXXX";
2302
char *tempdir = NULL;
2303
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2304
const char *seckey = PATHDIR "/" SECKEY;
2305
const char *pubkey = PATHDIR "/" PUBKEY;
2306
const char *dh_params_file = NULL;
2307
char *interfaces_hooks = NULL;
2308
2309
bool gnutls_initialized = false;
2310
bool gpgme_initialized = false;
2311
float delay = 2.5f;
2312
double retry_interval = 10; /* 10s between trying a server and
2313
retrying the same server again */
2314
2315
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
2316
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
2317
2318
uid = getuid();
2319
gid = getgid();
2320
2321
/* Lower any group privileges we might have, just to be safe */
2322
errno = 0;
2323
ret = setgid(gid);
2324
if(ret == -1){
2325
perror_plus("setgid");
2326
}
2327
2328
/* Lower user privileges (temporarily) */
2329
errno = 0;
2330
ret = seteuid(uid);
2331
if(ret == -1){
2332
perror_plus("seteuid");
2333
}
2334
2335
if(quit_now){
2336
goto end;
2337
}
2338
2339
{
2340
struct argp_option options[] = {
2341
{ .name = "debug", .key = 128,
2342
.doc = "Debug mode", .group = 3 },
2343
{ .name = "connect", .key = 'c',
2344
.arg = "ADDRESS:PORT",
2345
.doc = "Connect directly to a specific Mandos server",
2346
.group = 1 },
2347
{ .name = "interface", .key = 'i',
2348
.arg = "NAME",
2349
.doc = "Network interface that will be used to search for"
2350
" Mandos servers",
2351
.group = 1 },
2352
{ .name = "seckey", .key = 's',
2353
.arg = "FILE",
2354
.doc = "OpenPGP secret key file base name",
2355
.group = 1 },
2356
{ .name = "pubkey", .key = 'p',
2357
.arg = "FILE",
2358
.doc = "OpenPGP public key file base name",
2359
.group = 2 },
2360
{ .name = "dh-bits", .key = 129,
2361
.arg = "BITS",
2362
.doc = "Bit length of the prime number used in the"
2363
" Diffie-Hellman key exchange",
2364
.group = 2 },
2365
{ .name = "dh-params", .key = 134,
2366
.arg = "FILE",
2367
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2368
" for the Diffie-Hellman key exchange",
2369
.group = 2 },
2370
{ .name = "priority", .key = 130,
2371
.arg = "STRING",
2372
.doc = "GnuTLS priority string for the TLS handshake",
2373
.group = 1 },
2374
{ .name = "delay", .key = 131,
2375
.arg = "SECONDS",
2376
.doc = "Maximum delay to wait for interface startup",
2377
.group = 2 },
2378
{ .name = "retry", .key = 132,
2379
.arg = "SECONDS",
2380
.doc = "Retry interval used when denied by the Mandos server",
2381
.group = 2 },
2382
{ .name = "network-hook-dir", .key = 133,
2383
.arg = "DIR",
2384
.doc = "Directory where network hooks are located",
2385
.group = 2 },
2386
/*
2387
* These reproduce what we would get without ARGP_NO_HELP
2388
*/
2389
{ .name = "help", .key = '?',
2390
.doc = "Give this help list", .group = -1 },
2391
{ .name = "usage", .key = -3,
2392
.doc = "Give a short usage message", .group = -1 },
2393
{ .name = "version", .key = 'V',
2394
.doc = "Print program version", .group = -1 },
2395
{ .name = NULL }
2396
};
2397
2398
error_t parse_opt(int key, char *arg,
2399
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
}
2400
1002
errno = 0;
2401
switch(key){
2402
case 128: /* --debug */
2403
debug = true;
2404
break;
2405
case 'c': /* --connect */
2406
connect_to = arg;
2407
break;
2408
case 'i': /* --interface */
2409
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2410
arg, (int)',');
2411
if(ret_errno != 0){
2412
argp_error(state, "%s", strerror(ret_errno));
2413
}
2414
break;
2415
case 's': /* --seckey */
2416
seckey = arg;
2417
break;
2418
case 'p': /* --pubkey */
2419
pubkey = arg;
2420
break;
2421
case 129: /* --dh-bits */
2422
errno = 0;
2423
tmpmax = strtoimax(arg, &tmp, 10);
2424
if(errno != 0 or tmp == arg or *tmp != '\0'
2425
or tmpmax != (typeof(mc.dh_bits))tmpmax){
2426
argp_error(state, "Bad number of DH bits");
2427
}
2428
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2429
break;
2430
case 134: /* --dh-params */
2431
dh_params_file = arg;
2432
break;
2433
case 130: /* --priority */
2434
mc.priority = arg;
2435
break;
2436
case 131: /* --delay */
2437
errno = 0;
2438
delay = strtof(arg, &tmp);
2439
if(errno != 0 or tmp == arg or *tmp != '\0'){
2440
argp_error(state, "Bad delay");
2441
}
2442
case 132: /* --retry */
2443
errno = 0;
2444
retry_interval = strtod(arg, &tmp);
2445
if(errno != 0 or tmp == arg or *tmp != '\0'
2446
or (retry_interval * 1000) > INT_MAX
2447
or retry_interval < 0){
2448
argp_error(state, "Bad retry interval");
2449
}
2450
break;
2451
case 133: /* --network-hook-dir */
2452
hookdir = arg;
2453
break;
2454
/*
2455
* These reproduce what we would get without ARGP_NO_HELP
2456
*/
2457
case '?': /* --help */
2458
argp_state_help(state, state->out_stream,
2459
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2460
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2461
case -3: /* --usage */
2462
argp_state_help(state, state->out_stream,
2463
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2464
case 'V': /* --version */
2465
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2466
exit(argp_err_exit_status);
2467
break;
2468
default:
2469
return ARGP_ERR_UNKNOWN;
2470
}
2471
return errno;
2472
}
2473
2474
struct argp argp = { .options = options, .parser = parse_opt,
2475
.args_doc = "",
2476
.doc = "Mandos client -- Get and decrypt"
2477
" passwords from a Mandos server" };
2478
ret = argp_parse(&argp, argc, argv,
2479
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2480
switch(ret){
2481
case 0:
2482
break;
2483
case ENOMEM:
2484
default:
2485
errno = ret;
2486
perror_plus("argp_parse");
2487
exitcode = EX_OSERR;
2488
goto end;
2489
case EINVAL:
2490
exitcode = EX_USAGE;
2491
goto end;
2492
}
2493
}
2494
2495
{
2496
/* Work around Debian bug #633582:
2497
<http://bugs.debian.org/633582> */
2498
2499
/* Re-raise privileges */
2500
ret_errno = raise_privileges();
2501
if(ret_errno != 0){
2502
errno = ret_errno;
2503
perror_plus("Failed to raise privileges");
2504
} else {
2505
struct stat st;
2506
2507
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2508
int seckey_fd = open(seckey, O_RDONLY);
2509
if(seckey_fd == -1){
2510
perror_plus("open");
2511
} else {
2512
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2513
if(ret == -1){
2514
perror_plus("fstat");
2515
} else {
2516
if(S_ISREG(st.st_mode)
2517
and st.st_uid == 0 and st.st_gid == 0){
2518
ret = fchown(seckey_fd, uid, gid);
2519
if(ret == -1){
2520
perror_plus("fchown");
2521
}
2522
}
2523
}
2524
TEMP_FAILURE_RETRY(close(seckey_fd));
2525
}
2526
}
2527
2528
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2529
int pubkey_fd = open(pubkey, O_RDONLY);
2530
if(pubkey_fd == -1){
2531
perror_plus("open");
2532
} else {
2533
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2534
if(ret == -1){
2535
perror_plus("fstat");
2536
} else {
2537
if(S_ISREG(st.st_mode)
2538
and st.st_uid == 0 and st.st_gid == 0){
2539
ret = fchown(pubkey_fd, uid, gid);
2540
if(ret == -1){
2541
perror_plus("fchown");
2542
}
2543
}
2544
}
2545
TEMP_FAILURE_RETRY(close(pubkey_fd));
2546
}
2547
}
2548
2549
if(strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2550
int dhparams_fd = open(dh_params_file, O_RDONLY);
2551
if(dhparams_fd == -1){
2552
perror_plus("open");
2553
} else {
2554
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2555
if(ret == -1){
2556
perror_plus("fstat");
2557
} else {
2558
if(S_ISREG(st.st_mode)
2559
and st.st_uid == 0 and st.st_gid == 0){
2560
ret = fchown(dhparams_fd, uid, gid);
2561
if(ret == -1){
2562
perror_plus("fchown");
2563
}
2564
}
2565
}
2566
TEMP_FAILURE_RETRY(close(dhparams_fd));
2567
}
2568
}
2569
2570
/* Lower privileges */
2571
ret_errno = lower_privileges();
2572
if(ret_errno != 0){
2573
errno = ret_errno;
2574
perror_plus("Failed to lower privileges");
2575
}
2576
}
2577
}
2578
2579
/* Remove invalid interface names (except "none") */
2580
{
2581
char *interface = NULL;
2582
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2583
interface))){
2584
if(strcmp(interface, "none") != 0
2585
and if_nametoindex(interface) == 0){
2586
if(interface[0] != '\0'){
2587
fprintf_plus(stderr, "Not using nonexisting interface"
2588
" \"%s\"\n", interface);
2589
}
2590
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2591
interface = NULL;
2592
}
2593
}
2594
}
2595
2596
/* Run network hooks */
2597
{
2598
if(mc.interfaces != NULL){
2599
interfaces_hooks = malloc(mc.interfaces_size);
2600
if(interfaces_hooks == NULL){
2601
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;
2602
1007
goto end;
2603
1008
}
2604
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2605
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2606
}
2607
run_network_hooks("start", interfaces_hooks != NULL ?
2608
interfaces_hooks : "", delay);
2609
}
2610
2611
if(not debug){
2612
avahi_set_log_function(empty_log);
2613
}
2614
2615
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2616
from the signal handler */
2617
/* Initialize the pseudo-RNG for Avahi */
2618
srand((unsigned int) time(NULL));
2619
simple_poll = avahi_simple_poll_new();
2620
if(simple_poll == NULL){
2621
fprintf_plus(stderr,
2622
"Avahi: Failed to create simple poll object.\n");
2623
exitcode = EX_UNAVAILABLE;
2624
goto end;
2625
}
2626
2627
sigemptyset(&sigterm_action.sa_mask);
2628
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2629
if(ret == -1){
2630
perror_plus("sigaddset");
2631
exitcode = EX_OSERR;
2632
goto end;
2633
}
2634
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2635
if(ret == -1){
2636
perror_plus("sigaddset");
2637
exitcode = EX_OSERR;
2638
goto end;
2639
}
2640
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2641
if(ret == -1){
2642
perror_plus("sigaddset");
2643
exitcode = EX_OSERR;
2644
goto end;
2645
}
2646
/* Need to check if the handler is SIG_IGN before handling:
2647
| [[info:libc:Initial Signal Actions]] |
2648
| [[info:libc:Basic Signal Handling]] |
2649
*/
2650
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2651
if(ret == -1){
2652
perror_plus("sigaction");
2653
return EX_OSERR;
2654
}
2655
if(old_sigterm_action.sa_handler != SIG_IGN){
2656
ret = sigaction(SIGINT, &sigterm_action, NULL);
2657
if(ret == -1){
2658
perror_plus("sigaction");
2659
exitcode = EX_OSERR;
2660
goto end;
2661
}
2662
}
2663
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2664
if(ret == -1){
2665
perror_plus("sigaction");
2666
return EX_OSERR;
2667
}
2668
if(old_sigterm_action.sa_handler != SIG_IGN){
2669
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2670
if(ret == -1){
2671
perror_plus("sigaction");
2672
exitcode = EX_OSERR;
2673
goto end;
2674
}
2675
}
2676
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2677
if(ret == -1){
2678
perror_plus("sigaction");
2679
return EX_OSERR;
2680
}
2681
if(old_sigterm_action.sa_handler != SIG_IGN){
2682
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2683
if(ret == -1){
2684
perror_plus("sigaction");
2685
exitcode = EX_OSERR;
2686
goto end;
2687
}
2688
}
2689
2690
/* If no interfaces were specified, make a list */
2691
if(mc.interfaces == NULL){
2692
struct dirent **direntries = NULL;
2693
/* Look for any good interfaces */
2694
ret = scandir(sys_class_net, &direntries, good_interface,
2695
alphasort);
2696
if(ret >= 1){
2697
/* Add all found interfaces to interfaces list */
2698
for(int i = 0; i < ret; ++i){
2699
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2700
direntries[i]->d_name);
2701
if(ret_errno != 0){
2702
errno = ret_errno;
2703
perror_plus("argz_add");
2704
free(direntries[i]);
2705
continue;
2706
}
2707
if(debug){
2708
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2709
direntries[i]->d_name);
2710
}
2711
free(direntries[i]);
2712
}
2713
free(direntries);
2714
} else {
2715
if(ret == 0){
2716
free(direntries);
2717
}
2718
fprintf_plus(stderr, "Could not find a network interface\n");
2719
exitcode = EXIT_FAILURE;
2720
goto end;
2721
}
2722
}
2723
2724
/* Bring up interfaces which are down, and remove any "none"s */
2725
{
2726
char *interface = NULL;
2727
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2728
interface))){
2729
/* If interface name is "none", stop bringing up interfaces.
2730
Also remove all instances of "none" from the list */
2731
if(strcmp(interface, "none") == 0){
2732
argz_delete(&mc.interfaces, &mc.interfaces_size,
2733
interface);
2734
interface = NULL;
2735
while((interface = argz_next(mc.interfaces,
2736
mc.interfaces_size, interface))){
2737
if(strcmp(interface, "none") == 0){
2738
argz_delete(&mc.interfaces, &mc.interfaces_size,
2739
interface);
2740
interface = NULL;
2741
}
2742
}
2743
break;
2744
}
2745
bool interface_was_up = interface_is_up(interface);
2746
errno = bring_up_interface(interface, delay);
2747
if(not interface_was_up){
2748
if(errno != 0){
2749
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2750
" %s\n", interface, strerror(errno));
2751
} else {
2752
errno = argz_add(&interfaces_to_take_down,
2753
&interfaces_to_take_down_size,
2754
interface);
2755
if(errno != 0){
2756
perror_plus("argz_add");
2757
}
2758
}
2759
}
2760
}
2761
if(debug and (interfaces_to_take_down == NULL)){
2762
fprintf_plus(stderr, "No interfaces were brought up\n");
2763
}
2764
}
2765
2766
/* If we only got one interface, explicitly use only that one */
2767
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2768
if(debug){
2769
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2770
mc.interfaces);
2771
}
2772
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2773
}
2774
2775
if(quit_now){
2776
goto end;
2777
}
2778
2779
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2780
if(ret == -1){
2781
fprintf_plus(stderr, "init_gnutls_global failed\n");
2782
exitcode = EX_UNAVAILABLE;
2783
goto end;
2784
} else {
2785
gnutls_initialized = true;
2786
}
2787
2788
if(quit_now){
2789
goto end;
2790
}
2791
2792
/* Try /run/tmp before /tmp */
2793
tempdir = mkdtemp(run_tempdir);
2794
if(tempdir == NULL and errno == ENOENT){
2795
if(debug){
2796
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2797
run_tempdir, old_tempdir);
2798
}
2799
tempdir = mkdtemp(old_tempdir);
2800
}
2801
if(tempdir == NULL){
2802
perror_plus("mkdtemp");
2803
goto end;
2804
}
2805
2806
if(quit_now){
2807
goto end;
2808
}
2809
2810
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2811
fprintf_plus(stderr, "init_gpgme failed\n");
2812
exitcode = EX_UNAVAILABLE;
2813
goto end;
2814
} else {
2815
gpgme_initialized = true;
2816
}
2817
2818
if(quit_now){
2819
goto end;
2820
}
2821
2822
if(connect_to != NULL){
2823
/* Connect directly, do not use Zeroconf */
2824
/* (Mainly meant for debugging) */
2825
char *address = strrchr(connect_to, ':');
2826
2827
if(address == NULL){
2828
fprintf_plus(stderr, "No colon in address\n");
2829
exitcode = EX_USAGE;
2830
goto end;
2831
}
2832
2833
if(quit_now){
2834
goto end;
2835
}
2836
2837
in_port_t port;
2838
errno = 0;
2839
tmpmax = strtoimax(address+1, &tmp, 10);
2840
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2841
or tmpmax != (in_port_t)tmpmax){
2842
fprintf_plus(stderr, "Bad port number\n");
2843
exitcode = EX_USAGE;
2844
goto end;
2845
}
2846
2847
if(quit_now){
2848
goto end;
2849
}
2850
2851
port = (in_port_t)tmpmax;
2852
*address = '\0';
2853
/* Colon in address indicates IPv6 */
2854
int af;
2855
if(strchr(connect_to, ':') != NULL){
2856
af = AF_INET6;
2857
/* Accept [] around IPv6 address - see RFC 5952 */
2858
if(connect_to[0] == '[' and address[-1] == ']')
2859
{
2860
connect_to++;
2861
address[-1] = '\0';
2862
}
2863
} else {
2864
af = AF_INET;
2865
}
2866
address = connect_to;
2867
2868
if(quit_now){
2869
goto end;
2870
}
2871
2872
while(not quit_now){
2873
ret = start_mandos_communication(address, port, if_index, af,
2874
&mc);
2875
if(quit_now or ret == 0){
2876
break;
2877
}
2878
if(debug){
2879
fprintf_plus(stderr, "Retrying in %d seconds\n",
2880
(int)retry_interval);
2881
}
2882
sleep((unsigned int)retry_interval);
2883
}
2884
2885
if(not quit_now){
2886
exitcode = EXIT_SUCCESS;
2887
}
2888
2889
goto end;
2890
}
2891
2892
if(quit_now){
2893
goto end;
2894
}
2895
2896
{
2897
AvahiServerConfig config;
2898
/* Do not publish any local Zeroconf records */
2899
avahi_server_config_init(&config);
2900
config.publish_hinfo = 0;
2901
config.publish_addresses = 0;
2902
config.publish_workstation = 0;
2903
config.publish_domain = 0;
2904
2905
/* Allocate a new server */
2906
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2907
&config, NULL, NULL, &ret_errno);
2908
2909
/* Free the Avahi configuration data */
2910
avahi_server_config_free(&config);
2911
}
2912
2913
/* Check if creating the Avahi server object succeeded */
2914
if(mc.server == NULL){
2915
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2916
avahi_strerror(ret_errno));
2917
exitcode = EX_UNAVAILABLE;
2918
goto end;
2919
}
2920
2921
if(quit_now){
2922
goto end;
2923
}
2924
2925
/* Create the Avahi service browser */
2926
sb = avahi_s_service_browser_new(mc.server, if_index,
2927
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2928
NULL, 0, browse_callback,
2929
(void *)&mc);
2930
if(sb == NULL){
2931
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2932
avahi_strerror(avahi_server_errno(mc.server)));
2933
exitcode = EX_UNAVAILABLE;
2934
goto end;
2935
}
2936
2937
if(quit_now){
2938
goto end;
2939
}
2940
2941
/* Run the main loop */
2942
2943
if(debug){
2944
fprintf_plus(stderr, "Starting Avahi loop search\n");
2945
}
2946
2947
ret = avahi_loop_with_timeout(simple_poll,
2948
(int)(retry_interval * 1000), &mc);
2949
if(debug){
2950
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2951
(ret == 0) ? "successfully" : "with error");
2952
}
2953
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
2954
1082
end:
2955
2956
if(debug){
2957
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2958
}
2959
2960
/* Cleanup things */
2961
free(mc.interfaces);
2962
2963
if(sb != NULL)
2964
avahi_s_service_browser_free(sb);
2965
2966
if(mc.server != NULL)
2967
avahi_server_free(mc.server);
2968
2969
if(simple_poll != NULL)
2970
avahi_simple_poll_free(simple_poll);
2971
2972
if(gnutls_initialized){
2973
gnutls_certificate_free_credentials(mc.cred);
2974
gnutls_global_deinit();
2975
gnutls_dh_params_deinit(mc.dh_params);
2976
}
2977
2978
if(gpgme_initialized){
2979
gpgme_release(mc.ctx);
2980
}
2981
2982
/* Cleans up the circular linked list of Mandos servers the client
2983
has seen */
2984
if(mc.current_server != NULL){
2985
mc.current_server->prev->next = NULL;
2986
while(mc.current_server != NULL){
2987
server *next = mc.current_server->next;
2988
#ifdef __GNUC__
2989
#pragma GCC diagnostic push
2990
#pragma GCC diagnostic ignored "-Wcast-qual"
2991
#endif
2992
free((char *)(mc.current_server->ip));
2993
#ifdef __GNUC__
2994
#pragma GCC diagnostic pop
2995
#endif
2996
free(mc.current_server);
2997
mc.current_server = next;
2998
}
2999
}
3000
3001
/* Re-raise privileges */
3002
{
3003
ret_errno = raise_privileges();
3004
if(ret_errno != 0){
3005
errno = ret_errno;
3006
perror_plus("Failed to raise privileges");
3007
} else {
3008
3009
/* Run network hooks */
3010
run_network_hooks("stop", interfaces_hooks != NULL ?
3011
interfaces_hooks : "", delay);
3012
3013
/* Take down the network interfaces which were brought up */
3014
{
3015
char *interface = NULL;
3016
while((interface=argz_next(interfaces_to_take_down,
3017
interfaces_to_take_down_size,
3018
interface))){
3019
ret_errno = take_down_interface(interface);
3020
if(ret_errno != 0){
3021
errno = ret_errno;
3022
perror_plus("Failed to take down interface");
3023
}
3024
}
3025
if(debug and (interfaces_to_take_down == NULL)){
3026
fprintf_plus(stderr, "No interfaces needed to be taken"
3027
" down\n");
3028
}
3029
}
3030
}
3031
3032
ret_errno = lower_privileges_permanently();
3033
if(ret_errno != 0){
3034
errno = ret_errno;
3035
perror_plus("Failed to lower privileges permanently");
3036
}
3037
}
3038
3039
free(interfaces_to_take_down);
3040
free(interfaces_hooks);
3041
3042
/* Removes the GPGME temp directory and all files inside */
3043
if(tempdir != NULL){
3044
struct dirent **direntries = NULL;
3045
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
3046
| O_NOFOLLOW
3047
| O_DIRECTORY
3048
| O_PATH));
3049
if(tempdir_fd == -1){
3050
perror_plus("open");
3051
} else {
3052
#ifdef __GLIBC__
3053
#if __GLIBC_PREREQ(2, 15)
3054
int numentries = scandirat(tempdir_fd, ".", &direntries,
3055
notdotentries, alphasort);
3056
#else /* not __GLIBC_PREREQ(2, 15) */
3057
int numentries = scandir(tempdir, &direntries, notdotentries,
3058
alphasort);
3059
#endif /* not __GLIBC_PREREQ(2, 15) */
3060
#else /* not __GLIBC__ */
3061
int numentries = scandir(tempdir, &direntries, notdotentries,
3062
alphasort);
3063
#endif /* not __GLIBC__ */
3064
if(numentries >= 0){
3065
for(int i = 0; i < numentries; i++){
3066
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
3067
if(ret == -1){
3068
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
3069
" \"%s\", 0): %s\n", tempdir,
3070
direntries[i]->d_name, strerror(errno));
3071
}
3072
free(direntries[i]);
3073
}
3074
3075
/* need to clean even if 0 because man page doesn't specify */
3076
free(direntries);
3077
if(numentries == -1){
3078
perror_plus("scandir");
3079
}
3080
ret = rmdir(tempdir);
3081
if(ret == -1 and errno != ENOENT){
3082
perror_plus("rmdir");
3083
}
3084
}
3085
TEMP_FAILURE_RETRY(close(tempdir_fd));
3086
}
3087
}
3088
3089
if(quit_now){
3090
sigemptyset(&old_sigterm_action.sa_mask);
3091
old_sigterm_action.sa_handler = SIG_DFL;
3092
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
3093
&old_sigterm_action,
3094
NULL));
3095
if(ret == -1){
3096
perror_plus("sigaction");
3097
}
3098
do {
3099
ret = raise(signal_received);
3100
} while(ret != 0 and errno == EINTR);
3101
if(ret != 0){
3102
perror_plus("raise");
3103
abort();
3104
}
3105
TEMP_FAILURE_RETRY(pause());
3106
}
3107
3108
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;
3109
1144
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0