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» Revision
24.1.24
(compared to revision 505.2.2)
: plugins.d/password-request.c
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- Committer: Björn Påhlsson
- Date: 2008-08-08 01:51:58 UTC
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 50.
- Revision ID: belorn@braxen-20080808015158-gudud63aet3l8jlw
minor edits
- files added:
- network-protocol.txt
- files removed:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- files renamed:
- mandos-clients.conf.xml => clients.conf.xml
- plugin-runner.c => mandos-client.c
- plugin-runner.xml => mandos-client.xml
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.xml
- files modified:
- Makefile
added
removed
plugins.d/password-request.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 © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 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
36
#ifndef _FILE_OFFSET_BITS
37
33
#define _FILE_OFFSET_BITS 64
38
#endif
39
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open() */
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
*/
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
34
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
36
37
#include <stdio.h>
38
#include <assert.h>
39
#include <stdlib.h>
40
#include <time.h>
41
#include <net/if.h> /* if_nametoindex */
42
#include <sys/ioctl.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
43
SIOCSIFFLAGS */
68
44
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
SIOCSIFFLAGS, if_indextoname(),
70
if_nametoindex(), IF_NAMESIZE */
71
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
*/
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
78
#include <iso646.h> /* not, or, and */
79
#include <argp.h> /* struct argp_option, error_t, struct
80
argp_state, struct argp,
81
argp_parse(), ARGP_KEY_ARG,
82
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
83
#include <signal.h> /* sigemptyset(), sigaddset(),
84
sigaction(), SIGTERM, sig_atomic_t,
85
raise() */
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
89
#ifdef __linux__
90
#include <sys/klog.h> /* klogctl() */
91
#endif /* __linux__ */
92
93
/* Avahi */
94
/* All Avahi types, constants and functions
95
Avahi*, avahi_*,
96
AVAHI_* */
45
SIOCSIFFLAGS */
46
97
47
#include <avahi-core/core.h>
98
48
#include <avahi-core/lookup.h>
99
49
#include <avahi-core/log.h>
101
51
#include <avahi-common/malloc.h>
102
52
#include <avahi-common/error.h>
103
53
104
/* GnuTLS */
105
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
106
functions:
107
gnutls_*
108
init_gnutls_session(),
109
GNUTLS_* */
110
#include <gnutls/openpgp.h>
111
/* gnutls_certificate_set_openpgp_key_file(),
112
GNUTLS_OPENPGP_FMT_BASE64 */
54
/* Mandos client part */
55
#include <sys/types.h> /* socket(), inet_pton() */
56
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
57
struct in6_addr, inet_pton() */
58
#include <gnutls/gnutls.h> /* All GnuTLS stuff */
59
#include <gnutls/openpgp.h> /* GnuTLS with openpgp stuff */
113
60
61
#include <unistd.h> /* close() */
62
#include <netinet/in.h>
63
#include <stdbool.h> /* true */
64
#include <string.h> /* memset */
65
#include <arpa/inet.h> /* inet_pton() */
66
#include <iso646.h> /* not */
67
#include <net/if.h> /* IF_NAMESIZE */
68
#include <argp.h> /* struct argp_option,
69
struct argp_state, struct argp,
70
argp_parse() */
114
71
/* GPGME */
115
#include <gpgme.h> /* All GPGME types, constants and
116
functions:
117
gpgme_*
118
GPGME_PROTOCOL_OpenPGP,
119
GPG_ERR_NO_* */
72
#include <errno.h> /* perror() */
73
#include <gpgme.h>
120
74
121
75
#define BUFFER_SIZE 256
122
76
123
#define PATHDIR "/conf/conf.d/mandos"
124
#define SECKEY "seckey.txt"
125
#define PUBKEY "pubkey.txt"
126
127
77
bool debug = false;
78
static const char *keydir = "/conf/conf.d/mandos";
128
79
static const char mandos_protocol_version[] = "1";
129
const char *argp_program_version = "mandos-client " VERSION;
130
const char *argp_program_bug_address = "<mandos@recompile.se>";
131
static const char sys_class_net[] = "/sys/class/net";
132
char *connect_to = NULL;
133
134
/* Doubly linked list that need to be circularly linked when used */
135
typedef struct server{
136
const char *ip;
137
uint16_t port;
138
AvahiIfIndex if_index;
139
int af;
140
struct timespec last_seen;
141
struct server *next;
142
struct server *prev;
143
} server;
80
const char *argp_program_version = "mandosclient 0.9";
81
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
144
82
145
83
/* Used for passing in values through the Avahi callback functions */
146
84
typedef struct {
150
88
unsigned int dh_bits;
151
89
gnutls_dh_params_t dh_params;
152
90
const char *priority;
153
gpgme_ctx_t ctx;
154
server *current_server;
155
91
} mandos_context;
156
92
157
/* global context so signal handler can reach it*/
158
mandos_context mc = { .simple_poll = NULL, .server = NULL,
159
.dh_bits = 1024, .priority = "SECURE256"
160
":!CTYPE-X.509:+CTYPE-OPENPGP",
161
.current_server = NULL };
162
163
sig_atomic_t quit_now = 0;
164
int signal_received = 0;
165
166
/* Function to use when printing errors */
167
void perror_plus(const char *print_text){
168
fprintf(stderr, "Mandos plugin %s: ",
169
program_invocation_short_name);
170
perror(print_text);
171
}
172
173
93
/*
174
* Make additional room in "buffer" for at least BUFFER_SIZE more
175
* bytes. "buffer_capacity" is how much is currently allocated,
94
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
95
* "buffer_capacity" is how much is currently allocated,
176
96
* "buffer_length" is how much is already used.
177
97
*/
178
size_t incbuffer(char **buffer, size_t buffer_length,
98
size_t adjustbuffer(char **buffer, size_t buffer_length,
179
99
size_t buffer_capacity){
180
if(buffer_length + BUFFER_SIZE > buffer_capacity){
100
if (buffer_length + BUFFER_SIZE > buffer_capacity){
181
101
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
182
if(buffer == NULL){
102
if (buffer == NULL){
183
103
return 0;
184
104
}
185
105
buffer_capacity += BUFFER_SIZE;
187
107
return buffer_capacity;
188
108
}
189
109
190
/* Add server to set of servers to retry periodically */
191
int add_server(const char *ip, uint16_t port,
192
AvahiIfIndex if_index,
193
int af){
194
int ret;
195
server *new_server = malloc(sizeof(server));
196
if(new_server == NULL){
197
perror_plus("malloc");
198
return -1;
199
}
200
*new_server = (server){ .ip = strdup(ip),
201
.port = port,
202
.if_index = if_index,
203
.af = af };
204
if(new_server->ip == NULL){
205
perror_plus("strdup");
206
return -1;
207
}
208
/* Special case of first server */
209
if (mc.current_server == NULL){
210
new_server->next = new_server;
211
new_server->prev = new_server;
212
mc.current_server = new_server;
213
/* Place the new server last in the list */
214
} else {
215
new_server->next = mc.current_server;
216
new_server->prev = mc.current_server->prev;
217
new_server->prev->next = new_server;
218
mc.current_server->prev = new_server;
219
}
220
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
221
if(ret == -1){
222
perror_plus("clock_gettime");
223
return -1;
224
}
225
return 0;
226
}
227
228
110
/*
229
* Initialize GPGME.
111
* Decrypt OpenPGP data using keyrings in HOMEDIR.
112
* Returns -1 on error
230
113
*/
231
static bool init_gpgme(const char *seckey,
232
const char *pubkey, const char *tempdir){
114
static ssize_t pgp_packet_decrypt (const char *cryptotext,
115
size_t crypto_size,
116
char **plaintext,
117
const char *homedir){
118
gpgme_data_t dh_crypto, dh_plain;
119
gpgme_ctx_t ctx;
233
120
gpgme_error_t rc;
121
ssize_t ret;
122
size_t plaintext_capacity = 0;
123
ssize_t plaintext_length = 0;
234
124
gpgme_engine_info_t engine_info;
235
125
236
237
/*
238
* Helper function to insert pub and seckey to the engine keyring.
239
*/
240
bool import_key(const char *filename){
241
int ret;
242
int fd;
243
gpgme_data_t pgp_data;
244
245
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
246
if(fd == -1){
247
perror_plus("open");
248
return false;
249
}
250
251
rc = gpgme_data_new_from_fd(&pgp_data, fd);
252
if(rc != GPG_ERR_NO_ERROR){
253
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
254
gpgme_strsource(rc), gpgme_strerror(rc));
255
return false;
256
}
257
258
rc = gpgme_op_import(mc.ctx, pgp_data);
259
if(rc != GPG_ERR_NO_ERROR){
260
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
261
gpgme_strsource(rc), gpgme_strerror(rc));
262
return false;
263
}
264
265
ret = (int)TEMP_FAILURE_RETRY(close(fd));
266
if(ret == -1){
267
perror_plus("close");
268
}
269
gpgme_data_release(pgp_data);
270
return true;
271
}
272
273
if(debug){
274
fprintf(stderr, "Initializing GPGME\n");
126
if (debug){
127
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
275
128
}
276
129
277
130
/* Init GPGME */
278
131
gpgme_check_version(NULL);
279
132
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
280
if(rc != GPG_ERR_NO_ERROR){
133
if (rc != GPG_ERR_NO_ERROR){
281
134
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
282
135
gpgme_strsource(rc), gpgme_strerror(rc));
283
return false;
136
return -1;
284
137
}
285
138
286
139
/* Set GPGME home directory for the OpenPGP engine only */
287
rc = gpgme_get_engine_info(&engine_info);
288
if(rc != GPG_ERR_NO_ERROR){
140
rc = gpgme_get_engine_info (&engine_info);
141
if (rc != GPG_ERR_NO_ERROR){
289
142
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
290
143
gpgme_strsource(rc), gpgme_strerror(rc));
291
return false;
144
return -1;
292
145
}
293
146
while(engine_info != NULL){
294
147
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
295
148
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
296
engine_info->file_name, tempdir);
149
engine_info->file_name, homedir);
297
150
break;
298
151
}
299
152
engine_info = engine_info->next;
300
153
}
301
154
if(engine_info == NULL){
302
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
303
return false;
304
}
305
306
/* Create new GPGME "context" */
307
rc = gpgme_new(&(mc.ctx));
308
if(rc != GPG_ERR_NO_ERROR){
309
fprintf(stderr, "bad gpgme_new: %s: %s\n",
310
gpgme_strsource(rc), gpgme_strerror(rc));
311
return false;
312
}
313
314
if(not import_key(pubkey) or not import_key(seckey)){
315
return false;
316
}
317
318
return true;
319
}
320
321
/*
322
* Decrypt OpenPGP data.
323
* Returns -1 on error
324
*/
325
static ssize_t pgp_packet_decrypt(const char *cryptotext,
326
size_t crypto_size,
327
char **plaintext){
328
gpgme_data_t dh_crypto, dh_plain;
329
gpgme_error_t rc;
330
ssize_t ret;
331
size_t plaintext_capacity = 0;
332
ssize_t plaintext_length = 0;
333
334
if(debug){
335
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
155
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
156
return -1;
336
157
}
337
158
338
159
/* Create new GPGME data buffer from memory cryptotext */
339
160
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
340
161
0);
341
if(rc != GPG_ERR_NO_ERROR){
162
if (rc != GPG_ERR_NO_ERROR){
342
163
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
343
164
gpgme_strsource(rc), gpgme_strerror(rc));
344
165
return -1;
346
167
347
168
/* Create new empty GPGME data buffer for the plaintext */
348
169
rc = gpgme_data_new(&dh_plain);
349
if(rc != GPG_ERR_NO_ERROR){
170
if (rc != GPG_ERR_NO_ERROR){
350
171
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
351
172
gpgme_strsource(rc), gpgme_strerror(rc));
352
173
gpgme_data_release(dh_crypto);
353
174
return -1;
354
175
}
355
176
177
/* Create new GPGME "context" */
178
rc = gpgme_new(&ctx);
179
if (rc != GPG_ERR_NO_ERROR){
180
fprintf(stderr, "bad gpgme_new: %s: %s\n",
181
gpgme_strsource(rc), gpgme_strerror(rc));
182
plaintext_length = -1;
183
goto decrypt_end;
184
}
185
356
186
/* Decrypt data from the cryptotext data buffer to the plaintext
357
187
data buffer */
358
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
359
if(rc != GPG_ERR_NO_ERROR){
188
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
189
if (rc != GPG_ERR_NO_ERROR){
360
190
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
361
191
gpgme_strsource(rc), gpgme_strerror(rc));
362
192
plaintext_length = -1;
363
if(debug){
364
gpgme_decrypt_result_t result;
365
result = gpgme_op_decrypt_result(mc.ctx);
366
if(result == NULL){
367
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
368
} else {
369
fprintf(stderr, "Unsupported algorithm: %s\n",
370
result->unsupported_algorithm);
371
fprintf(stderr, "Wrong key usage: %u\n",
372
result->wrong_key_usage);
373
if(result->file_name != NULL){
374
fprintf(stderr, "File name: %s\n", result->file_name);
375
}
376
gpgme_recipient_t recipient;
377
recipient = result->recipients;
193
goto decrypt_end;
194
}
195
196
if(debug){
197
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
198
}
199
200
if (debug){
201
gpgme_decrypt_result_t result;
202
result = gpgme_op_decrypt_result(ctx);
203
if (result == NULL){
204
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
205
} else {
206
fprintf(stderr, "Unsupported algorithm: %s\n",
207
result->unsupported_algorithm);
208
fprintf(stderr, "Wrong key usage: %d\n",
209
result->wrong_key_usage);
210
if(result->file_name != NULL){
211
fprintf(stderr, "File name: %s\n", result->file_name);
212
}
213
gpgme_recipient_t recipient;
214
recipient = result->recipients;
215
if(recipient){
378
216
while(recipient != NULL){
379
217
fprintf(stderr, "Public key algorithm: %s\n",
380
218
gpgme_pubkey_algo_name(recipient->pubkey_algo));
386
224
}
387
225
}
388
226
}
389
goto decrypt_end;
390
}
391
392
if(debug){
393
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
394
227
}
395
228
396
229
/* Seek back to the beginning of the GPGME plaintext data buffer */
397
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
398
perror_plus("gpgme_data_seek");
230
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
231
perror("pgpme_data_seek");
399
232
plaintext_length = -1;
400
233
goto decrypt_end;
401
234
}
402
235
403
236
*plaintext = NULL;
404
237
while(true){
405
plaintext_capacity = incbuffer(plaintext,
238
plaintext_capacity = adjustbuffer(plaintext,
406
239
(size_t)plaintext_length,
407
240
plaintext_capacity);
408
if(plaintext_capacity == 0){
409
perror_plus("incbuffer");
241
if (plaintext_capacity == 0){
242
perror("adjustbuffer");
410
243
plaintext_length = -1;
411
244
goto decrypt_end;
412
245
}
414
247
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
415
248
BUFFER_SIZE);
416
249
/* Print the data, if any */
417
if(ret == 0){
250
if (ret == 0){
418
251
/* EOF */
419
252
break;
420
253
}
421
254
if(ret < 0){
422
perror_plus("gpgme_data_read");
255
perror("gpgme_data_read");
423
256
plaintext_length = -1;
424
257
goto decrypt_end;
425
258
}
426
259
plaintext_length += ret;
427
260
}
428
261
429
262
if(debug){
430
263
fprintf(stderr, "Decrypted password is: ");
431
264
for(ssize_t i = 0; i < plaintext_length; i++){
444
277
return plaintext_length;
445
278
}
446
279
447
static const char * safer_gnutls_strerror(int value){
448
const char *ret = gnutls_strerror(value); /* Spurious warning from
449
-Wunreachable-code */
450
if(ret == NULL)
280
static const char * safer_gnutls_strerror (int value) {
281
const char *ret = gnutls_strerror (value);
282
if (ret == NULL)
451
283
ret = "(unknown)";
452
284
return ret;
453
285
}
458
290
fprintf(stderr, "GnuTLS: %s", string);
459
291
}
460
292
461
static int init_gnutls_global(const char *pubkeyfilename,
462
const char *seckeyfilename){
293
static int init_gnutls_global(mandos_context *mc,
294
const char *pubkeyfile,
295
const char *seckeyfile){
463
296
int ret;
464
297
465
298
if(debug){
466
299
fprintf(stderr, "Initializing GnuTLS\n");
467
300
}
468
469
ret = gnutls_global_init();
470
if(ret != GNUTLS_E_SUCCESS){
471
fprintf(stderr, "GnuTLS global_init: %s\n",
472
safer_gnutls_strerror(ret));
301
302
if ((ret = gnutls_global_init ())
303
!= GNUTLS_E_SUCCESS) {
304
fprintf (stderr, "GnuTLS global_init: %s\n",
305
safer_gnutls_strerror(ret));
473
306
return -1;
474
307
}
475
308
476
if(debug){
309
if (debug){
477
310
/* "Use a log level over 10 to enable all debugging options."
478
311
* - GnuTLS manual
479
312
*/
482
315
}
483
316
484
317
/* OpenPGP credentials */
485
ret = gnutls_certificate_allocate_credentials(&mc.cred);
486
if(ret != GNUTLS_E_SUCCESS){
487
fprintf(stderr, "GnuTLS memory error: %s\n",
488
safer_gnutls_strerror(ret));
489
gnutls_global_deinit();
318
if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))
319
!= GNUTLS_E_SUCCESS) {
320
fprintf (stderr, "GnuTLS memory error: %s\n",
321
safer_gnutls_strerror(ret));
322
gnutls_global_deinit ();
490
323
return -1;
491
324
}
492
325
493
326
if(debug){
494
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
495
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
496
seckeyfilename);
327
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
328
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
329
seckeyfile);
497
330
}
498
331
499
332
ret = gnutls_certificate_set_openpgp_key_file
500
(mc.cred, pubkeyfilename, seckeyfilename,
501
GNUTLS_OPENPGP_FMT_BASE64);
502
if(ret != GNUTLS_E_SUCCESS){
333
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
334
if (ret != GNUTLS_E_SUCCESS) {
503
335
fprintf(stderr,
504
336
"Error[%d] while reading the OpenPGP key pair ('%s',"
505
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
506
fprintf(stderr, "The GnuTLS error is: %s\n",
337
" '%s')\n", ret, pubkeyfile, seckeyfile);
338
fprintf(stdout, "The GnuTLS error is: %s\n",
507
339
safer_gnutls_strerror(ret));
508
340
goto globalfail;
509
341
}
510
342
511
343
/* GnuTLS server initialization */
512
ret = gnutls_dh_params_init(&mc.dh_params);
513
if(ret != GNUTLS_E_SUCCESS){
514
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
515
" %s\n", safer_gnutls_strerror(ret));
516
goto globalfail;
517
}
518
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
519
if(ret != GNUTLS_E_SUCCESS){
520
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
521
safer_gnutls_strerror(ret));
522
goto globalfail;
523
}
524
525
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
526
344
ret = gnutls_dh_params_init(&mc->dh_params);
345
if (ret != GNUTLS_E_SUCCESS) {
346
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
347
" %s\n", safer_gnutls_strerror(ret));
348
goto globalfail;
349
}
350
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
351
if (ret != GNUTLS_E_SUCCESS) {
352
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
353
safer_gnutls_strerror(ret));
354
goto globalfail;
355
}
356
357
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
358
527
359
return 0;
528
360
529
361
globalfail:
530
531
gnutls_certificate_free_credentials(mc.cred);
532
gnutls_global_deinit();
533
gnutls_dh_params_deinit(mc.dh_params);
362
363
gnutls_certificate_free_credentials (mc->cred);
364
gnutls_global_deinit ();
534
365
return -1;
366
535
367
}
536
368
537
static int init_gnutls_session(gnutls_session_t *session){
369
static int init_gnutls_session(mandos_context *mc,
370
gnutls_session_t *session){
538
371
int ret;
539
372
/* GnuTLS session creation */
540
do {
541
ret = gnutls_init(session, GNUTLS_SERVER);
542
if(quit_now){
543
return -1;
544
}
545
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
546
if(ret != GNUTLS_E_SUCCESS){
373
ret = gnutls_init(session, GNUTLS_SERVER);
374
if (ret != GNUTLS_E_SUCCESS){
547
375
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
548
376
safer_gnutls_strerror(ret));
549
377
}
550
378
551
379
{
552
380
const char *err;
553
do {
554
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
555
if(quit_now){
556
gnutls_deinit(*session);
557
return -1;
558
}
559
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
560
if(ret != GNUTLS_E_SUCCESS){
381
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
382
if (ret != GNUTLS_E_SUCCESS) {
561
383
fprintf(stderr, "Syntax error at: %s\n", err);
562
384
fprintf(stderr, "GnuTLS error: %s\n",
563
385
safer_gnutls_strerror(ret));
564
gnutls_deinit(*session);
386
gnutls_deinit (*session);
565
387
return -1;
566
388
}
567
389
}
568
390
569
do {
570
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
571
mc.cred);
572
if(quit_now){
573
gnutls_deinit(*session);
574
return -1;
575
}
576
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
577
if(ret != GNUTLS_E_SUCCESS){
391
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
392
mc->cred);
393
if (ret != GNUTLS_E_SUCCESS) {
578
394
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
579
395
safer_gnutls_strerror(ret));
580
gnutls_deinit(*session);
396
gnutls_deinit (*session);
581
397
return -1;
582
398
}
583
399
584
400
/* ignore client certificate if any. */
585
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
401
gnutls_certificate_server_set_request (*session,
402
GNUTLS_CERT_IGNORE);
586
403
587
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
404
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
588
405
589
406
return 0;
590
407
}
596
413
/* Called when a Mandos server is found */
597
414
static int start_mandos_communication(const char *ip, uint16_t port,
598
415
AvahiIfIndex if_index,
599
int af){
600
int ret, tcp_sd = -1;
601
ssize_t sret;
602
union {
603
struct sockaddr_in in;
604
struct sockaddr_in6 in6;
605
} to;
416
mandos_context *mc){
417
int ret, tcp_sd;
418
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
606
419
char *buffer = NULL;
607
char *decrypted_buffer = NULL;
420
char *decrypted_buffer;
608
421
size_t buffer_length = 0;
609
422
size_t buffer_capacity = 0;
423
ssize_t decrypted_buffer_size;
610
424
size_t written;
611
int retval = -1;
425
int retval = 0;
426
char interface[IF_NAMESIZE];
612
427
gnutls_session_t session;
613
int pf; /* Protocol family */
614
615
errno = 0;
616
617
if(quit_now){
618
errno = EINTR;
619
return -1;
620
}
621
622
switch(af){
623
case AF_INET6:
624
pf = PF_INET6;
625
break;
626
case AF_INET:
627
pf = PF_INET;
628
break;
629
default:
630
fprintf(stderr, "Bad address family: %d\n", af);
631
errno = EINVAL;
632
return -1;
633
}
634
635
ret = init_gnutls_session(&session);
636
if(ret != 0){
637
return -1;
638
}
639
640
if(debug){
641
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
642
"\n", ip, port);
643
}
644
645
tcp_sd = socket(pf, SOCK_STREAM, 0);
646
if(tcp_sd < 0){
647
int e = errno;
648
perror_plus("socket");
649
errno = e;
650
goto mandos_end;
651
}
652
653
if(quit_now){
654
errno = EINTR;
655
goto mandos_end;
656
}
657
658
memset(&to, 0, sizeof(to));
659
if(af == AF_INET6){
660
to.in6.sin6_family = (sa_family_t)af;
661
ret = inet_pton(af, ip, &to.in6.sin6_addr);
662
} else { /* IPv4 */
663
to.in.sin_family = (sa_family_t)af;
664
ret = inet_pton(af, ip, &to.in.sin_addr);
665
}
666
if(ret < 0 ){
667
int e = errno;
668
perror_plus("inet_pton");
669
errno = e;
670
goto mandos_end;
428
429
ret = init_gnutls_session (mc, &session);
430
if (ret != 0){
431
return -1;
432
}
433
434
if(debug){
435
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
436
ip, port);
437
}
438
439
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
440
if(tcp_sd < 0) {
441
perror("socket");
442
return -1;
443
}
444
445
if(debug){
446
if(if_indextoname((unsigned int)if_index, interface) == NULL){
447
perror("if_indextoname");
448
return -1;
449
}
450
fprintf(stderr, "Binding to interface %s\n", interface);
451
}
452
453
memset(&to,0,sizeof(to)); /* Spurious warning */
454
to.in6.sin6_family = AF_INET6;
455
/* It would be nice to have a way to detect if we were passed an
456
IPv4 address here. Now we assume an IPv6 address. */
457
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
458
if (ret < 0 ){
459
perror("inet_pton");
460
return -1;
671
461
}
672
462
if(ret == 0){
673
int e = errno;
674
463
fprintf(stderr, "Bad address: %s\n", ip);
675
errno = e;
676
goto mandos_end;
677
}
678
if(af == AF_INET6){
679
to.in6.sin6_port = htons(port); /* Spurious warnings from
680
-Wconversion and
681
-Wunreachable-code */
682
683
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
684
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
685
-Wunreachable-code*/
686
if(if_index == AVAHI_IF_UNSPEC){
687
fprintf(stderr, "An IPv6 link-local address is incomplete"
688
" without a network interface\n");
689
errno = EINVAL;
690
goto mandos_end;
691
}
692
/* Set the network interface number as scope */
693
to.in6.sin6_scope_id = (uint32_t)if_index;
694
}
695
} else {
696
to.in.sin_port = htons(port); /* Spurious warnings from
697
-Wconversion and
698
-Wunreachable-code */
699
}
464
return -1;
465
}
466
to.in6.sin6_port = htons(port); /* Spurious warning */
700
467
701
if(quit_now){
702
errno = EINTR;
703
goto mandos_end;
704
}
468
to.in6.sin6_scope_id = (uint32_t)if_index;
705
469
706
470
if(debug){
707
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
708
char interface[IF_NAMESIZE];
709
if(if_indextoname((unsigned int)if_index, interface) == NULL){
710
perror_plus("if_indextoname");
711
} else {
712
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
713
ip, interface, port);
714
}
715
} else {
716
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
717
port);
718
}
719
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
720
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
721
const char *pcret;
722
if(af == AF_INET6){
723
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
724
sizeof(addrstr));
725
} else {
726
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
727
sizeof(addrstr));
728
}
729
if(pcret == NULL){
730
perror_plus("inet_ntop");
471
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
472
char addrstr[INET6_ADDRSTRLEN] = "";
473
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
474
sizeof(addrstr)) == NULL){
475
perror("inet_ntop");
731
476
} else {
732
477
if(strcmp(addrstr, ip) != 0){
733
478
fprintf(stderr, "Canonical address form: %s\n", addrstr);
735
480
}
736
481
}
737
482
738
if(quit_now){
739
errno = EINTR;
740
goto mandos_end;
741
}
742
743
if(af == AF_INET6){
744
ret = connect(tcp_sd, &to.in6, sizeof(to));
745
} else {
746
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
747
}
748
if(ret < 0){
749
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
750
int e = errno;
751
perror_plus("connect");
752
errno = e;
753
}
754
goto mandos_end;
755
}
756
757
if(quit_now){
758
errno = EINTR;
759
goto mandos_end;
760
}
761
483
ret = connect(tcp_sd, &to.in, sizeof(to));
484
if (ret < 0){
485
perror("connect");
486
return -1;
487
}
488
762
489
const char *out = mandos_protocol_version;
763
490
written = 0;
764
while(true){
491
while (true){
765
492
size_t out_size = strlen(out);
766
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
493
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
767
494
out_size - written));
768
if(ret == -1){
769
int e = errno;
770
perror_plus("write");
771
errno = e;
495
if (ret == -1){
496
perror("write");
497
retval = -1;
772
498
goto mandos_end;
773
499
}
774
500
written += (size_t)ret;
775
501
if(written < out_size){
776
502
continue;
777
503
} else {
778
if(out == mandos_protocol_version){
504
if (out == mandos_protocol_version){
779
505
written = 0;
780
506
out = "\r\n";
781
507
} else {
782
508
break;
783
509
}
784
510
}
785
786
if(quit_now){
787
errno = EINTR;
788
goto mandos_end;
789
}
790
511
}
791
512
792
513
if(debug){
793
514
fprintf(stderr, "Establishing TLS session with %s\n", ip);
794
515
}
795
516
796
if(quit_now){
797
errno = EINTR;
798
goto mandos_end;
799
}
800
801
/* Spurious warning from -Wint-to-pointer-cast */
802
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
803
804
if(quit_now){
805
errno = EINTR;
806
goto mandos_end;
807
}
808
809
do {
810
ret = gnutls_handshake(session);
811
if(quit_now){
812
errno = EINTR;
813
goto mandos_end;
814
}
815
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
816
817
if(ret != GNUTLS_E_SUCCESS){
517
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
518
519
ret = gnutls_handshake (session);
520
521
if (ret != GNUTLS_E_SUCCESS){
818
522
if(debug){
819
523
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
820
gnutls_perror(ret);
524
gnutls_perror (ret);
821
525
}
822
errno = EPROTO;
526
retval = -1;
823
527
goto mandos_end;
824
528
}
825
529
826
530
/* Read OpenPGP packet that contains the wanted password */
827
531
828
532
if(debug){
829
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
533
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
830
534
ip);
831
535
}
832
536
833
537
while(true){
834
835
if(quit_now){
836
errno = EINTR;
837
goto mandos_end;
838
}
839
840
buffer_capacity = incbuffer(&buffer, buffer_length,
538
buffer_capacity = adjustbuffer(&buffer, buffer_length,
841
539
buffer_capacity);
842
if(buffer_capacity == 0){
843
int e = errno;
844
perror_plus("incbuffer");
845
errno = e;
846
goto mandos_end;
847
}
848
849
if(quit_now){
850
errno = EINTR;
851
goto mandos_end;
852
}
853
854
sret = gnutls_record_recv(session, buffer+buffer_length,
855
BUFFER_SIZE);
856
if(sret == 0){
540
if (buffer_capacity == 0){
541
perror("adjustbuffer");
542
retval = -1;
543
goto mandos_end;
544
}
545
546
ret = gnutls_record_recv(session, buffer+buffer_length,
547
BUFFER_SIZE);
548
if (ret == 0){
857
549
break;
858
550
}
859
if(sret < 0){
860
switch(sret){
551
if (ret < 0){
552
switch(ret){
861
553
case GNUTLS_E_INTERRUPTED:
862
554
case GNUTLS_E_AGAIN:
863
555
break;
864
556
case GNUTLS_E_REHANDSHAKE:
865
do {
866
ret = gnutls_handshake(session);
867
868
if(quit_now){
869
errno = EINTR;
870
goto mandos_end;
871
}
872
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
873
if(ret < 0){
557
ret = gnutls_handshake (session);
558
if (ret < 0){
874
559
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
875
gnutls_perror(ret);
876
errno = EPROTO;
560
gnutls_perror (ret);
561
retval = -1;
877
562
goto mandos_end;
878
563
}
879
564
break;
880
565
default:
881
566
fprintf(stderr, "Unknown error while reading data from"
882
567
" encrypted session with Mandos server\n");
883
gnutls_bye(session, GNUTLS_SHUT_RDWR);
884
errno = EIO;
568
retval = -1;
569
gnutls_bye (session, GNUTLS_SHUT_RDWR);
885
570
goto mandos_end;
886
571
}
887
572
} else {
888
buffer_length += (size_t) sret;
573
buffer_length += (size_t) ret;
889
574
}
890
575
}
891
576
893
578
fprintf(stderr, "Closing TLS session\n");
894
579
}
895
580
896
if(quit_now){
897
errno = EINTR;
898
goto mandos_end;
899
}
900
901
do {
902
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
903
if(quit_now){
904
errno = EINTR;
905
goto mandos_end;
906
}
907
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
908
909
if(buffer_length > 0){
910
ssize_t decrypted_buffer_size;
581
gnutls_bye (session, GNUTLS_SHUT_RDWR);
582
583
if (buffer_length > 0){
911
584
decrypted_buffer_size = pgp_packet_decrypt(buffer,
912
585
buffer_length,
913
&decrypted_buffer);
914
if(decrypted_buffer_size >= 0){
915
586
&decrypted_buffer,
587
keydir);
588
if (decrypted_buffer_size >= 0){
916
589
written = 0;
917
590
while(written < (size_t) decrypted_buffer_size){
918
if(quit_now){
919
errno = EINTR;
920
goto mandos_end;
921
}
922
923
ret = (int)fwrite(decrypted_buffer + written, 1,
924
(size_t)decrypted_buffer_size - written,
925
stdout);
591
ret = (int)fwrite (decrypted_buffer + written, 1,
592
(size_t)decrypted_buffer_size - written,
593
stdout);
926
594
if(ret == 0 and ferror(stdout)){
927
int e = errno;
928
595
if(debug){
929
596
fprintf(stderr, "Error writing encrypted data: %s\n",
930
597
strerror(errno));
931
598
}
932
errno = e;
933
goto mandos_end;
599
retval = -1;
600
break;
934
601
}
935
602
written += (size_t)ret;
936
603
}
937
retval = 0;
604
free(decrypted_buffer);
605
} else {
606
retval = -1;
938
607
}
939
608
}
940
609
941
610
/* Shutdown procedure */
942
611
943
612
mandos_end:
944
{
945
int e = errno;
946
free(decrypted_buffer);
947
free(buffer);
948
if(tcp_sd >= 0){
949
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
950
}
951
if(ret == -1){
952
if(e == 0){
953
e = errno;
954
}
955
perror_plus("close");
956
}
957
gnutls_deinit(session);
958
errno = e;
959
if(quit_now){
960
errno = EINTR;
961
retval = -1;
962
}
963
}
613
free(buffer);
614
close(tcp_sd);
615
gnutls_deinit (session);
964
616
return retval;
965
617
}
966
618
967
619
static void resolve_callback(AvahiSServiceResolver *r,
968
620
AvahiIfIndex interface,
969
AvahiProtocol proto,
621
AVAHI_GCC_UNUSED AvahiProtocol protocol,
970
622
AvahiResolverEvent event,
971
623
const char *name,
972
624
const char *type,
977
629
AVAHI_GCC_UNUSED AvahiStringList *txt,
978
630
AVAHI_GCC_UNUSED AvahiLookupResultFlags
979
631
flags,
980
AVAHI_GCC_UNUSED void* userdata){
981
assert(r);
632
void* userdata) {
633
mandos_context *mc = userdata;
634
assert(r); /* Spurious warning */
982
635
983
636
/* Called whenever a service has been resolved successfully or
984
637
timed out */
985
638
986
if(quit_now){
987
return;
988
}
989
990
switch(event){
639
switch (event) {
991
640
default:
992
641
case AVAHI_RESOLVER_FAILURE:
993
642
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
994
643
" of type '%s' in domain '%s': %s\n", name, type, domain,
995
avahi_strerror(avahi_server_errno(mc.server)));
644
avahi_strerror(avahi_server_errno(mc->server)));
996
645
break;
997
646
998
647
case AVAHI_RESOLVER_FOUND:
1000
649
char ip[AVAHI_ADDRESS_STR_MAX];
1001
650
avahi_address_snprint(ip, sizeof(ip), address);
1002
651
if(debug){
1003
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1004
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1005
ip, (intmax_t)interface, port);
652
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %d) on"
653
" port %d\n", name, host_name, ip, interface, port);
1006
654
}
1007
int ret = start_mandos_communication(ip, port, interface,
1008
avahi_proto_to_af(proto));
1009
if(ret == 0){
1010
avahi_simple_poll_quit(mc.simple_poll);
1011
} else {
1012
ret = add_server(ip, port, interface,
1013
avahi_proto_to_af(proto));
655
int ret = start_mandos_communication(ip, port, interface, mc);
656
if (ret == 0){
657
exit(EXIT_SUCCESS);
1014
658
}
1015
659
}
1016
660
}
1017
661
avahi_s_service_resolver_free(r);
1018
662
}
1019
663
1020
static void browse_callback(AvahiSServiceBrowser *b,
1021
AvahiIfIndex interface,
1022
AvahiProtocol protocol,
1023
AvahiBrowserEvent event,
1024
const char *name,
1025
const char *type,
1026
const char *domain,
1027
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1028
flags,
1029
AVAHI_GCC_UNUSED void* userdata){
1030
assert(b);
664
static void browse_callback( AvahiSServiceBrowser *b,
665
AvahiIfIndex interface,
666
AvahiProtocol protocol,
667
AvahiBrowserEvent event,
668
const char *name,
669
const char *type,
670
const char *domain,
671
AVAHI_GCC_UNUSED AvahiLookupResultFlags
672
flags,
673
void* userdata) {
674
mandos_context *mc = userdata;
675
assert(b); /* Spurious warning */
1031
676
1032
677
/* Called whenever a new services becomes available on the LAN or
1033
678
is removed from the LAN */
1034
679
1035
if(quit_now){
1036
return;
1037
}
1038
1039
switch(event){
680
switch (event) {
1040
681
default:
1041
682
case AVAHI_BROWSER_FAILURE:
1042
683
1043
684
fprintf(stderr, "(Avahi browser) %s\n",
1044
avahi_strerror(avahi_server_errno(mc.server)));
1045
avahi_simple_poll_quit(mc.simple_poll);
685
avahi_strerror(avahi_server_errno(mc->server)));
686
avahi_simple_poll_quit(mc->simple_poll);
1046
687
return;
1047
688
1048
689
case AVAHI_BROWSER_NEW:
1051
692
the callback function is called the Avahi server will free the
1052
693
resolver for us. */
1053
694
1054
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1055
name, type, domain, protocol, 0,
1056
resolve_callback, NULL) == NULL)
695
if (!(avahi_s_service_resolver_new(mc->server, interface,
696
protocol, name, type, domain,
697
AVAHI_PROTO_INET6, 0,
698
resolve_callback, mc)))
1057
699
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1058
name, avahi_strerror(avahi_server_errno(mc.server)));
700
name, avahi_strerror(avahi_server_errno(mc->server)));
1059
701
break;
1060
702
1061
703
case AVAHI_BROWSER_REMOVE:
1070
712
}
1071
713
}
1072
714
1073
/* Signal handler that stops main loop after SIGTERM */
1074
static void handle_sigterm(int sig){
1075
if(quit_now){
1076
return;
1077
}
1078
quit_now = 1;
1079
signal_received = sig;
1080
int old_errno = errno;
1081
/* set main loop to exit */
1082
if(mc.simple_poll != NULL){
1083
avahi_simple_poll_quit(mc.simple_poll);
1084
}
1085
errno = old_errno;
1086
}
1087
1088
bool get_flags(const char *ifname, struct ifreq *ifr){
1089
int ret;
1090
1091
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1092
if(s < 0){
1093
perror_plus("socket");
1094
return false;
1095
}
1096
strcpy(ifr->ifr_name, ifname);
1097
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1098
if(ret == -1){
1099
if(debug){
1100
perror_plus("ioctl SIOCGIFFLAGS");
1101
}
1102
return false;
1103
}
1104
return true;
1105
}
1106
1107
bool good_flags(const char *ifname, const struct ifreq *ifr){
1108
1109
/* Reject the loopback device */
1110
if(ifr->ifr_flags & IFF_LOOPBACK){
1111
if(debug){
1112
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1113
ifname);
1114
}
1115
return false;
1116
}
1117
/* Accept point-to-point devices only if connect_to is specified */
1118
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1119
if(debug){
1120
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1121
ifname);
1122
}
1123
return true;
1124
}
1125
/* Otherwise, reject non-broadcast-capable devices */
1126
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1127
if(debug){
1128
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1129
ifname);
1130
}
1131
return false;
1132
}
1133
/* Reject non-ARP interfaces (including dummy interfaces) */
1134
if(ifr->ifr_flags & IFF_NOARP){
1135
if(debug){
1136
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n", ifname);
1137
}
1138
return false;
1139
}
1140
1141
/* Accept this device */
1142
if(debug){
1143
fprintf(stderr, "Interface \"%s\" is good\n", ifname);
1144
}
1145
return true;
1146
}
1147
1148
/*
1149
* This function determines if a directory entry in /sys/class/net
1150
* corresponds to an acceptable network device.
1151
* (This function is passed to scandir(3) as a filter function.)
1152
*/
1153
int good_interface(const struct dirent *if_entry){
1154
int ret;
1155
if(if_entry->d_name[0] == '.'){
1156
return 0;
1157
}
1158
struct ifreq ifr;
1159
1160
if(not get_flags(if_entry->d_name, &ifr)){
1161
return 0;
1162
}
1163
1164
if(not good_flags(if_entry->d_name, &ifr)){
1165
return 0;
1166
}
1167
return 1;
1168
}
1169
1170
int notdotentries(const struct dirent *direntry){
1171
/* Skip "." and ".." */
1172
if(direntry->d_name[0] == '.'
1173
and (direntry->d_name[1] == '\0'
1174
or (direntry->d_name[1] == '.'
1175
and direntry->d_name[2] == '\0'))){
1176
return 0;
1177
}
1178
return 1;
1179
}
1180
1181
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1182
int ret;
1183
struct timespec now;
1184
struct timespec waited_time;
1185
intmax_t block_time;
1186
1187
while(true){
1188
if(mc.current_server == NULL){
1189
if (debug){
1190
fprintf(stderr,
1191
"Wait until first server is found. No timeout!\n");
1192
}
1193
ret = avahi_simple_poll_iterate(s, -1);
1194
} else {
1195
if (debug){
1196
fprintf(stderr, "Check current_server if we should run it,"
1197
" or wait\n");
1198
}
1199
/* the current time */
1200
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1201
if(ret == -1){
1202
perror_plus("clock_gettime");
1203
return -1;
1204
}
1205
/* Calculating in ms how long time between now and server
1206
who we visted longest time ago. Now - last seen. */
1207
waited_time.tv_sec = (now.tv_sec
1208
- mc.current_server->last_seen.tv_sec);
1209
waited_time.tv_nsec = (now.tv_nsec
1210
- mc.current_server->last_seen.tv_nsec);
1211
/* total time is 10s/10,000ms.
1212
Converting to s from ms by dividing by 1,000,
1213
and ns to ms by dividing by 1,000,000. */
1214
block_time = ((retry_interval
1215
- ((intmax_t)waited_time.tv_sec * 1000))
1216
- ((intmax_t)waited_time.tv_nsec / 1000000));
1217
1218
if (debug){
1219
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1220
}
1221
1222
if(block_time <= 0){
1223
ret = start_mandos_communication(mc.current_server->ip,
1224
mc.current_server->port,
1225
mc.current_server->if_index,
1226
mc.current_server->af);
1227
if(ret == 0){
1228
avahi_simple_poll_quit(mc.simple_poll);
1229
return 0;
1230
}
1231
ret = clock_gettime(CLOCK_MONOTONIC,
1232
&mc.current_server->last_seen);
1233
if(ret == -1){
1234
perror_plus("clock_gettime");
1235
return -1;
1236
}
1237
mc.current_server = mc.current_server->next;
1238
block_time = 0; /* Call avahi to find new Mandos
1239
servers, but don't block */
1240
}
1241
1242
ret = avahi_simple_poll_iterate(s, (int)block_time);
1243
}
1244
if(ret != 0){
1245
if (ret > 0 or errno != EINTR) {
1246
return (ret != 1) ? ret : 0;
1247
}
1248
}
1249
}
1250
}
715
/* Combines file name and path and returns the malloced new
716
string. some sane checks could/should be added */
717
static const char *combinepath(const char *first, const char *second){
718
size_t f_len = strlen(first);
719
size_t s_len = strlen(second);
720
char *tmp = malloc(f_len + s_len + 2);
721
if (tmp == NULL){
722
return NULL;
723
}
724
if(f_len > 0){
725
memcpy(tmp, first, f_len); /* Spurious warning */
726
}
727
tmp[f_len] = '/';
728
if(s_len > 0){
729
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
730
}
731
tmp[f_len + 1 + s_len] = '\0';
732
return tmp;
733
}
734
1251
735
1252
736
int main(int argc, char *argv[]){
1253
AvahiSServiceBrowser *sb = NULL;
1254
int error;
1255
int ret;
1256
intmax_t tmpmax;
1257
char *tmp;
1258
int exitcode = EXIT_SUCCESS;
1259
const char *interface = "";
1260
struct ifreq network;
1261
int sd = -1;
1262
bool take_down_interface = false;
1263
uid_t uid;
1264
gid_t gid;
1265
char tempdir[] = "/tmp/mandosXXXXXX";
1266
bool tempdir_created = false;
1267
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1268
const char *seckey = PATHDIR "/" SECKEY;
1269
const char *pubkey = PATHDIR "/" PUBKEY;
1270
1271
bool gnutls_initialized = false;
1272
bool gpgme_initialized = false;
1273
float delay = 2.5f;
1274
double retry_interval = 10; /* 10s between trying a server and
1275
retrying the same server again */
1276
1277
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1278
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1279
1280
uid = getuid();
1281
gid = getgid();
1282
1283
/* Lower any group privileges we might have, just to be safe */
1284
errno = 0;
1285
ret = setgid(gid);
1286
if(ret == -1){
1287
perror_plus("setgid");
1288
}
1289
1290
/* Lower user privileges (temporarily) */
1291
errno = 0;
1292
ret = seteuid(uid);
1293
if(ret == -1){
1294
perror_plus("seteuid");
1295
}
1296
1297
if(quit_now){
1298
goto end;
1299
}
1300
1301
{
1302
struct argp_option options[] = {
1303
{ .name = "debug", .key = 128,
1304
.doc = "Debug mode", .group = 3 },
1305
{ .name = "connect", .key = 'c',
1306
.arg = "ADDRESS:PORT",
1307
.doc = "Connect directly to a specific Mandos server",
1308
.group = 1 },
1309
{ .name = "interface", .key = 'i',
1310
.arg = "NAME",
1311
.doc = "Network interface that will be used to search for"
1312
" Mandos servers",
1313
.group = 1 },
1314
{ .name = "seckey", .key = 's',
1315
.arg = "FILE",
1316
.doc = "OpenPGP secret key file base name",
1317
.group = 1 },
1318
{ .name = "pubkey", .key = 'p',
1319
.arg = "FILE",
1320
.doc = "OpenPGP public key file base name",
1321
.group = 2 },
1322
{ .name = "dh-bits", .key = 129,
1323
.arg = "BITS",
1324
.doc = "Bit length of the prime number used in the"
1325
" Diffie-Hellman key exchange",
1326
.group = 2 },
1327
{ .name = "priority", .key = 130,
1328
.arg = "STRING",
1329
.doc = "GnuTLS priority string for the TLS handshake",
1330
.group = 1 },
1331
{ .name = "delay", .key = 131,
1332
.arg = "SECONDS",
1333
.doc = "Maximum delay to wait for interface startup",
1334
.group = 2 },
1335
{ .name = "retry", .key = 132,
1336
.arg = "SECONDS",
1337
.doc = "Retry interval used when denied by the mandos server",
1338
.group = 2 },
1339
/*
1340
* These reproduce what we would get without ARGP_NO_HELP
1341
*/
1342
{ .name = "help", .key = '?',
1343
.doc = "Give this help list", .group = -1 },
1344
{ .name = "usage", .key = -3,
1345
.doc = "Give a short usage message", .group = -1 },
1346
{ .name = "version", .key = 'V',
1347
.doc = "Print program version", .group = -1 },
1348
{ .name = NULL }
1349
};
1350
1351
error_t parse_opt(int key, char *arg,
1352
struct argp_state *state){
1353
errno = 0;
1354
switch(key){
1355
case 128: /* --debug */
1356
debug = true;
1357
break;
1358
case 'c': /* --connect */
1359
connect_to = arg;
1360
break;
1361
case 'i': /* --interface */
1362
interface = arg;
1363
break;
1364
case 's': /* --seckey */
1365
seckey = arg;
1366
break;
1367
case 'p': /* --pubkey */
1368
pubkey = arg;
1369
break;
1370
case 129: /* --dh-bits */
1371
errno = 0;
1372
tmpmax = strtoimax(arg, &tmp, 10);
1373
if(errno != 0 or tmp == arg or *tmp != '\0'
1374
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1375
argp_error(state, "Bad number of DH bits");
1376
}
1377
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1378
break;
1379
case 130: /* --priority */
1380
mc.priority = arg;
1381
break;
1382
case 131: /* --delay */
1383
errno = 0;
1384
delay = strtof(arg, &tmp);
1385
if(errno != 0 or tmp == arg or *tmp != '\0'){
1386
argp_error(state, "Bad delay");
1387
}
1388
case 132: /* --retry */
1389
errno = 0;
1390
retry_interval = strtod(arg, &tmp);
1391
if(errno != 0 or tmp == arg or *tmp != '\0'
1392
or (retry_interval * 1000) > INT_MAX
1393
or retry_interval < 0){
1394
argp_error(state, "Bad retry interval");
1395
}
1396
break;
1397
/*
1398
* These reproduce what we would get without ARGP_NO_HELP
1399
*/
1400
case '?': /* --help */
1401
argp_state_help(state, state->out_stream,
1402
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1403
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1404
case -3: /* --usage */
1405
argp_state_help(state, state->out_stream,
1406
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1407
case 'V': /* --version */
1408
fprintf(state->out_stream, "%s\n", argp_program_version);
1409
exit(argp_err_exit_status);
1410
break;
1411
default:
1412
return ARGP_ERR_UNKNOWN;
1413
}
1414
return errno;
1415
}
1416
1417
struct argp argp = { .options = options, .parser = parse_opt,
1418
.args_doc = "",
1419
.doc = "Mandos client -- Get and decrypt"
1420
" passwords from a Mandos server" };
1421
ret = argp_parse(&argp, argc, argv,
1422
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1423
switch(ret){
1424
case 0:
1425
break;
1426
case ENOMEM:
1427
default:
1428
errno = ret;
1429
perror_plus("argp_parse");
1430
exitcode = EX_OSERR;
1431
goto end;
1432
case EINVAL:
1433
exitcode = EX_USAGE;
1434
goto end;
1435
}
1436
}
1437
1438
{
1439
/* Work around Debian bug #633582:
1440
<http://bugs.debian.org/633582> */
1441
struct stat st;
1442
1443
/* Re-raise priviliges */
1444
errno = 0;
1445
ret = seteuid(0);
1446
if(ret == -1){
1447
perror_plus("seteuid");
1448
}
1449
1450
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1451
int seckey_fd = open(seckey, O_RDONLY);
1452
if(seckey_fd == -1){
1453
perror_plus("open");
1454
} else {
1455
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1456
if(ret == -1){
1457
perror_plus("fstat");
1458
} else {
1459
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1460
ret = fchown(seckey_fd, uid, gid);
1461
if(ret == -1){
1462
perror_plus("fchown");
1463
}
1464
}
1465
}
1466
TEMP_FAILURE_RETRY(close(seckey_fd));
1467
}
1468
}
1469
1470
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1471
int pubkey_fd = open(pubkey, O_RDONLY);
1472
if(pubkey_fd == -1){
1473
perror_plus("open");
1474
} else {
1475
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1476
if(ret == -1){
1477
perror_plus("fstat");
1478
} else {
1479
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1480
ret = fchown(pubkey_fd, uid, gid);
1481
if(ret == -1){
1482
perror_plus("fchown");
1483
}
1484
}
1485
}
1486
TEMP_FAILURE_RETRY(close(pubkey_fd));
1487
}
1488
}
1489
1490
/* Lower privileges */
1491
errno = 0;
1492
ret = seteuid(uid);
1493
if(ret == -1){
1494
perror_plus("seteuid");
1495
}
1496
}
1497
1498
if(not debug){
1499
avahi_set_log_function(empty_log);
1500
}
1501
1502
if(interface[0] == '\0'){
1503
struct dirent **direntries;
1504
ret = scandir(sys_class_net, &direntries, good_interface,
1505
alphasort);
1506
if(ret >= 1){
1507
/* Pick the first good interface */
1508
interface = strdup(direntries[0]->d_name);
1509
if(debug){
1510
fprintf(stderr, "Using interface \"%s\"\n", interface);
1511
}
1512
if(interface == NULL){
1513
perror_plus("malloc");
1514
free(direntries);
1515
exitcode = EXIT_FAILURE;
1516
goto end;
1517
}
1518
free(direntries);
1519
} else {
1520
free(direntries);
1521
fprintf(stderr, "Could not find a network interface\n");
737
AvahiSServiceBrowser *sb = NULL;
738
int error;
739
int ret;
740
int exitcode = EXIT_SUCCESS;
741
const char *interface = "eth0";
742
struct ifreq network;
743
int sd;
744
uid_t uid;
745
gid_t gid;
746
char *connect_to = NULL;
747
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
748
const char *pubkeyfile = "pubkey.txt";
749
const char *seckeyfile = "seckey.txt";
750
mandos_context mc = { .simple_poll = NULL, .server = NULL,
751
.dh_bits = 1024, .priority = "SECURE256"};
752
bool gnutls_initalized = false;
753
754
{
755
struct argp_option options[] = {
756
{ .name = "debug", .key = 128,
757
.doc = "Debug mode", .group = 3 },
758
{ .name = "connect", .key = 'c',
759
.arg = "IP",
760
.doc = "Connect directly to a sepcified mandos server",
761
.group = 1 },
762
{ .name = "interface", .key = 'i',
763
.arg = "INTERFACE",
764
.doc = "Interface that Avahi will conntect through",
765
.group = 1 },
766
{ .name = "keydir", .key = 'd',
767
.arg = "KEYDIR",
768
.doc = "Directory where the openpgp keyring is",
769
.group = 1 },
770
{ .name = "seckey", .key = 's',
771
.arg = "SECKEY",
772
.doc = "Secret openpgp key for gnutls authentication",
773
.group = 1 },
774
{ .name = "pubkey", .key = 'p',
775
.arg = "PUBKEY",
776
.doc = "Public openpgp key for gnutls authentication",
777
.group = 2 },
778
{ .name = "dh-bits", .key = 129,
779
.arg = "BITS",
780
.doc = "dh-bits to use in gnutls communication",
781
.group = 2 },
782
{ .name = "priority", .key = 130,
783
.arg = "PRIORITY",
784
.doc = "GNUTLS priority", .group = 1 },
785
{ .name = NULL }
786
};
787
788
789
error_t parse_opt (int key, char *arg,
790
struct argp_state *state) {
791
/* Get the INPUT argument from `argp_parse', which we know is
792
a pointer to our plugin list pointer. */
793
switch (key) {
794
case 128:
795
debug = true;
796
break;
797
case 'c':
798
connect_to = arg;
799
break;
800
case 'i':
801
interface = arg;
802
break;
803
case 'd':
804
keydir = arg;
805
break;
806
case 's':
807
seckeyfile = arg;
808
break;
809
case 'p':
810
pubkeyfile = arg;
811
break;
812
case 129:
813
errno = 0;
814
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
815
if (errno){
816
perror("strtol");
817
exit(EXIT_FAILURE);
818
}
819
break;
820
case 130:
821
mc.priority = arg;
822
break;
823
case ARGP_KEY_ARG:
824
argp_usage (state);
825
break;
826
case ARGP_KEY_END:
827
break;
828
default:
829
return ARGP_ERR_UNKNOWN;
830
}
831
return 0;
832
}
833
834
struct argp argp = { .options = options, .parser = parse_opt,
835
.args_doc = "",
836
.doc = "Mandos client -- Get and decrypt"
837
" passwords from mandos server" };
838
argp_parse (&argp, argc, argv, 0, 0, NULL);
839
}
840
841
pubkeyfile = combinepath(keydir, pubkeyfile);
842
if (pubkeyfile == NULL){
843
perror("combinepath");
1522
844
exitcode = EXIT_FAILURE;
1523
845
goto end;
1524
846
}
1525
}
1526
1527
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1528
from the signal handler */
1529
/* Initialize the pseudo-RNG for Avahi */
1530
srand((unsigned int) time(NULL));
1531
mc.simple_poll = avahi_simple_poll_new();
1532
if(mc.simple_poll == NULL){
1533
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1534
exitcode = EX_UNAVAILABLE;
1535
goto end;
1536
}
1537
1538
sigemptyset(&sigterm_action.sa_mask);
1539
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1540
if(ret == -1){
1541
perror_plus("sigaddset");
1542
exitcode = EX_OSERR;
1543
goto end;
1544
}
1545
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1546
if(ret == -1){
1547
perror_plus("sigaddset");
1548
exitcode = EX_OSERR;
1549
goto end;
1550
}
1551
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1552
if(ret == -1){
1553
perror_plus("sigaddset");
1554
exitcode = EX_OSERR;
1555
goto end;
1556
}
1557
/* Need to check if the handler is SIG_IGN before handling:
1558
| [[info:libc:Initial Signal Actions]] |
1559
| [[info:libc:Basic Signal Handling]] |
1560
*/
1561
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1562
if(ret == -1){
1563
perror_plus("sigaction");
1564
return EX_OSERR;
1565
}
1566
if(old_sigterm_action.sa_handler != SIG_IGN){
1567
ret = sigaction(SIGINT, &sigterm_action, NULL);
1568
if(ret == -1){
1569
perror_plus("sigaction");
1570
exitcode = EX_OSERR;
1571
goto end;
1572
}
1573
}
1574
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1575
if(ret == -1){
1576
perror_plus("sigaction");
1577
return EX_OSERR;
1578
}
1579
if(old_sigterm_action.sa_handler != SIG_IGN){
1580
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1581
if(ret == -1){
1582
perror_plus("sigaction");
1583
exitcode = EX_OSERR;
1584
goto end;
1585
}
1586
}
1587
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1588
if(ret == -1){
1589
perror_plus("sigaction");
1590
return EX_OSERR;
1591
}
1592
if(old_sigterm_action.sa_handler != SIG_IGN){
1593
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1594
if(ret == -1){
1595
perror_plus("sigaction");
1596
exitcode = EX_OSERR;
1597
goto end;
1598
}
1599
}
1600
1601
/* If the interface is down, bring it up */
1602
if(strcmp(interface, "none") != 0){
847
848
seckeyfile = combinepath(keydir, seckeyfile);
849
if (seckeyfile == NULL){
850
perror("combinepath");
851
goto end;
852
}
853
854
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
855
if (ret == -1){
856
fprintf(stderr, "init_gnutls_global\n");
857
goto end;
858
} else {
859
gnutls_initalized = true;
860
}
861
862
uid = getuid();
863
gid = getgid();
864
865
ret = setuid(uid);
866
if (ret == -1){
867
perror("setuid");
868
}
869
870
setgid(gid);
871
if (ret == -1){
872
perror("setgid");
873
}
874
1603
875
if_index = (AvahiIfIndex) if_nametoindex(interface);
1604
876
if(if_index == 0){
1605
877
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1606
exitcode = EX_UNAVAILABLE;
1607
goto end;
1608
}
1609
1610
if(quit_now){
1611
goto end;
1612
}
1613
1614
/* Re-raise priviliges */
1615
errno = 0;
1616
ret = seteuid(0);
1617
if(ret == -1){
1618
perror_plus("seteuid");
1619
}
1620
1621
#ifdef __linux__
1622
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1623
messages about the network interface to mess up the prompt */
1624
ret = klogctl(8, NULL, 5);
1625
bool restore_loglevel = true;
1626
if(ret == -1){
1627
restore_loglevel = false;
1628
perror_plus("klogctl");
1629
}
1630
#endif /* __linux__ */
1631
1632
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1633
if(sd < 0){
1634
perror_plus("socket");
1635
exitcode = EX_OSERR;
1636
#ifdef __linux__
1637
if(restore_loglevel){
1638
ret = klogctl(7, NULL, 0);
1639
if(ret == -1){
1640
perror_plus("klogctl");
1641
}
1642
}
1643
#endif /* __linux__ */
1644
/* Lower privileges */
1645
errno = 0;
1646
ret = seteuid(uid);
1647
if(ret == -1){
1648
perror_plus("seteuid");
1649
}
1650
goto end;
1651
}
1652
strcpy(network.ifr_name, interface);
1653
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1654
if(ret == -1){
1655
perror_plus("ioctl SIOCGIFFLAGS");
1656
#ifdef __linux__
1657
if(restore_loglevel){
1658
ret = klogctl(7, NULL, 0);
1659
if(ret == -1){
1660
perror_plus("klogctl");
1661
}
1662
}
1663
#endif /* __linux__ */
1664
exitcode = EX_OSERR;
1665
/* Lower privileges */
1666
errno = 0;
1667
ret = seteuid(uid);
1668
if(ret == -1){
1669
perror_plus("seteuid");
1670
}
1671
goto end;
1672
}
1673
if((network.ifr_flags & IFF_UP) == 0){
1674
network.ifr_flags |= IFF_UP;
1675
take_down_interface = true;
1676
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1677
if(ret == -1){
1678
take_down_interface = false;
1679
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1680
exitcode = EX_OSERR;
1681
#ifdef __linux__
1682
if(restore_loglevel){
1683
ret = klogctl(7, NULL, 0);
1684
if(ret == -1){
1685
perror_plus("klogctl");
1686
}
1687
}
1688
#endif /* __linux__ */
1689
/* Lower privileges */
1690
errno = 0;
1691
ret = seteuid(uid);
1692
if(ret == -1){
1693
perror_plus("seteuid");
1694
}
1695
goto end;
1696
}
1697
}
1698
/* Sleep checking until interface is running.
1699
Check every 0.25s, up to total time of delay */
1700
for(int i=0; i < delay * 4; i++){
878
exit(EXIT_FAILURE);
879
}
880
881
if(connect_to != NULL){
882
/* Connect directly, do not use Zeroconf */
883
/* (Mainly meant for debugging) */
884
char *address = strrchr(connect_to, ':');
885
if(address == NULL){
886
fprintf(stderr, "No colon in address\n");
887
exitcode = EXIT_FAILURE;
888
goto end;
889
}
890
errno = 0;
891
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
892
if(errno){
893
perror("Bad port number");
894
exitcode = EXIT_FAILURE;
895
goto end;
896
}
897
*address = '\0';
898
address = connect_to;
899
ret = start_mandos_communication(address, port, if_index, &mc);
900
if(ret < 0){
901
exitcode = EXIT_FAILURE;
902
} else {
903
exitcode = EXIT_SUCCESS;
904
}
905
goto end;
906
}
907
908
/* If the interface is down, bring it up */
909
{
910
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
911
if(sd < 0) {
912
perror("socket");
913
exitcode = EXIT_FAILURE;
914
goto end;
915
}
916
strcpy(network.ifr_name, interface); /* Spurious warning */
1701
917
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1702
918
if(ret == -1){
1703
perror_plus("ioctl SIOCGIFFLAGS");
1704
} else if(network.ifr_flags & IFF_RUNNING){
1705
break;
1706
}
1707
struct timespec sleeptime = { .tv_nsec = 250000000 };
1708
ret = nanosleep(&sleeptime, NULL);
1709
if(ret == -1 and errno != EINTR){
1710
perror_plus("nanosleep");
1711
}
1712
}
1713
if(not take_down_interface){
1714
/* We won't need the socket anymore */
1715
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1716
if(ret == -1){
1717
perror_plus("close");
1718
}
1719
}
1720
#ifdef __linux__
1721
if(restore_loglevel){
1722
/* Restores kernel loglevel to default */
1723
ret = klogctl(7, NULL, 0);
1724
if(ret == -1){
1725
perror_plus("klogctl");
1726
}
1727
}
1728
#endif /* __linux__ */
1729
/* Lower privileges */
1730
errno = 0;
1731
if(take_down_interface){
1732
/* Lower privileges */
1733
ret = seteuid(uid);
1734
if(ret == -1){
1735
perror_plus("seteuid");
1736
}
1737
} else {
1738
/* Lower privileges permanently */
1739
ret = setuid(uid);
1740
if(ret == -1){
1741
perror_plus("setuid");
1742
}
1743
}
1744
}
1745
1746
if(quit_now){
1747
goto end;
1748
}
1749
1750
ret = init_gnutls_global(pubkey, seckey);
1751
if(ret == -1){
1752
fprintf(stderr, "init_gnutls_global failed\n");
1753
exitcode = EX_UNAVAILABLE;
1754
goto end;
1755
} else {
1756
gnutls_initialized = true;
1757
}
1758
1759
if(quit_now){
1760
goto end;
1761
}
1762
1763
if(mkdtemp(tempdir) == NULL){
1764
perror_plus("mkdtemp");
1765
goto end;
1766
}
1767
tempdir_created = true;
1768
1769
if(quit_now){
1770
goto end;
1771
}
1772
1773
if(not init_gpgme(pubkey, seckey, tempdir)){
1774
fprintf(stderr, "init_gpgme failed\n");
1775
exitcode = EX_UNAVAILABLE;
1776
goto end;
1777
} else {
1778
gpgme_initialized = true;
1779
}
1780
1781
if(quit_now){
1782
goto end;
1783
}
1784
1785
if(connect_to != NULL){
1786
/* Connect directly, do not use Zeroconf */
1787
/* (Mainly meant for debugging) */
1788
char *address = strrchr(connect_to, ':');
1789
if(address == NULL){
1790
fprintf(stderr, "No colon in address\n");
1791
exitcode = EX_USAGE;
1792
goto end;
1793
}
1794
1795
if(quit_now){
1796
goto end;
1797
}
1798
1799
uint16_t port;
1800
errno = 0;
1801
tmpmax = strtoimax(address+1, &tmp, 10);
1802
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1803
or tmpmax != (uint16_t)tmpmax){
1804
fprintf(stderr, "Bad port number\n");
1805
exitcode = EX_USAGE;
1806
goto end;
1807
}
1808
1809
if(quit_now){
1810
goto end;
1811
}
1812
1813
port = (uint16_t)tmpmax;
1814
*address = '\0';
1815
/* Colon in address indicates IPv6 */
1816
int af;
1817
if(strchr(connect_to, ':') != NULL){
1818
af = AF_INET6;
1819
/* Accept [] around IPv6 address - see RFC 5952 */
1820
if(connect_to[0] == '[' and address[-1] == ']')
1821
{
1822
connect_to++;
1823
address[-1] = '\0';
919
perror("ioctl SIOCGIFFLAGS");
920
exitcode = EXIT_FAILURE;
921
goto end;
922
}
923
if((network.ifr_flags & IFF_UP) == 0){
924
network.ifr_flags |= IFF_UP;
925
ret = ioctl(sd, SIOCSIFFLAGS, &network);
926
if(ret == -1){
927
perror("ioctl SIOCSIFFLAGS");
928
exitcode = EXIT_FAILURE;
929
goto end;
1824
930
}
1825
} else {
1826
af = AF_INET;
1827
}
1828
address = connect_to;
1829
1830
if(quit_now){
1831
goto end;
1832
}
1833
1834
while(not quit_now){
1835
ret = start_mandos_communication(address, port, if_index, af);
1836
if(quit_now or ret == 0){
1837
break;
1838
}
1839
if(debug){
1840
fprintf(stderr, "Retrying in %d seconds\n",
1841
(int)retry_interval);
1842
}
1843
sleep((int)retry_interval);
1844
}
1845
1846
if (not quit_now){
1847
exitcode = EXIT_SUCCESS;
1848
}
1849
1850
goto end;
1851
}
1852
1853
if(quit_now){
1854
goto end;
1855
}
1856
1857
{
1858
AvahiServerConfig config;
1859
/* Do not publish any local Zeroconf records */
1860
avahi_server_config_init(&config);
1861
config.publish_hinfo = 0;
1862
config.publish_addresses = 0;
1863
config.publish_workstation = 0;
1864
config.publish_domain = 0;
1865
1866
/* Allocate a new server */
1867
mc.server = avahi_server_new(avahi_simple_poll_get
1868
(mc.simple_poll), &config, NULL,
1869
NULL, &error);
1870
1871
/* Free the Avahi configuration data */
1872
avahi_server_config_free(&config);
1873
}
1874
1875
/* Check if creating the Avahi server object succeeded */
1876
if(mc.server == NULL){
1877
fprintf(stderr, "Failed to create Avahi server: %s\n",
1878
avahi_strerror(error));
1879
exitcode = EX_UNAVAILABLE;
1880
goto end;
1881
}
1882
1883
if(quit_now){
1884
goto end;
1885
}
1886
1887
/* Create the Avahi service browser */
1888
sb = avahi_s_service_browser_new(mc.server, if_index,
1889
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1890
NULL, 0, browse_callback, NULL);
1891
if(sb == NULL){
1892
fprintf(stderr, "Failed to create service browser: %s\n",
1893
avahi_strerror(avahi_server_errno(mc.server)));
1894
exitcode = EX_UNAVAILABLE;
1895
goto end;
1896
}
1897
1898
if(quit_now){
1899
goto end;
1900
}
1901
1902
/* Run the main loop */
1903
1904
if(debug){
1905
fprintf(stderr, "Starting Avahi loop search\n");
1906
}
1907
1908
ret = avahi_loop_with_timeout(mc.simple_poll,
1909
(int)(retry_interval * 1000));
1910
if(debug){
1911
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1912
(ret == 0) ? "successfully" : "with error");
1913
}
1914
931
}
932
close(sd);
933
}
934
935
if (not debug){
936
avahi_set_log_function(empty_log);
937
}
938
939
/* Initialize the pseudo-RNG for Avahi */
940
srand((unsigned int) time(NULL));
941
942
/* Allocate main Avahi loop object */
943
mc.simple_poll = avahi_simple_poll_new();
944
if (mc.simple_poll == NULL) {
945
fprintf(stderr, "Avahi: Failed to create simple poll"
946
" object.\n");
947
exitcode = EXIT_FAILURE;
948
goto end;
949
}
950
951
{
952
AvahiServerConfig config;
953
/* Do not publish any local Zeroconf records */
954
avahi_server_config_init(&config);
955
config.publish_hinfo = 0;
956
config.publish_addresses = 0;
957
config.publish_workstation = 0;
958
config.publish_domain = 0;
959
960
/* Allocate a new server */
961
mc.server = avahi_server_new(avahi_simple_poll_get
962
(mc.simple_poll), &config, NULL,
963
NULL, &error);
964
965
/* Free the Avahi configuration data */
966
avahi_server_config_free(&config);
967
}
968
969
/* Check if creating the Avahi server object succeeded */
970
if (mc.server == NULL) {
971
fprintf(stderr, "Failed to create Avahi server: %s\n",
972
avahi_strerror(error));
973
exitcode = EXIT_FAILURE;
974
goto end;
975
}
976
977
/* Create the Avahi service browser */
978
sb = avahi_s_service_browser_new(mc.server, if_index,
979
AVAHI_PROTO_INET6,
980
"_mandos._tcp", NULL, 0,
981
browse_callback, &mc);
982
if (sb == NULL) {
983
fprintf(stderr, "Failed to create service browser: %s\n",
984
avahi_strerror(avahi_server_errno(mc.server)));
985
exitcode = EXIT_FAILURE;
986
goto end;
987
}
988
989
/* Run the main loop */
990
991
if (debug){
992
fprintf(stderr, "Starting Avahi loop search\n");
993
}
994
995
avahi_simple_poll_loop(mc.simple_poll);
996
1915
997
end:
1916
1917
if(debug){
1918
fprintf(stderr, "%s exiting\n", argv[0]);
1919
}
1920
1921
/* Cleanup things */
1922
if(sb != NULL)
1923
avahi_s_service_browser_free(sb);
1924
1925
if(mc.server != NULL)
1926
avahi_server_free(mc.server);
1927
1928
if(mc.simple_poll != NULL)
1929
avahi_simple_poll_free(mc.simple_poll);
1930
1931
if(gnutls_initialized){
1932
gnutls_certificate_free_credentials(mc.cred);
1933
gnutls_global_deinit();
1934
gnutls_dh_params_deinit(mc.dh_params);
1935
}
1936
1937
if(gpgme_initialized){
1938
gpgme_release(mc.ctx);
1939
}
1940
1941
/* Cleans up the circular linked list of Mandos servers the client
1942
has seen */
1943
if(mc.current_server != NULL){
1944
mc.current_server->prev->next = NULL;
1945
while(mc.current_server != NULL){
1946
server *next = mc.current_server->next;
1947
free(mc.current_server);
1948
mc.current_server = next;
1949
}
1950
}
1951
1952
/* Take down the network interface */
1953
if(take_down_interface){
1954
/* Re-raise priviliges */
1955
errno = 0;
1956
ret = seteuid(0);
1957
if(ret == -1){
1958
perror_plus("seteuid");
1959
}
1960
if(geteuid() == 0){
1961
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1962
if(ret == -1){
1963
perror_plus("ioctl SIOCGIFFLAGS");
1964
} else if(network.ifr_flags & IFF_UP) {
1965
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1966
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1967
if(ret == -1){
1968
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1969
}
1970
}
1971
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1972
if(ret == -1){
1973
perror_plus("close");
1974
}
1975
/* Lower privileges permanently */
1976
errno = 0;
1977
ret = setuid(uid);
1978
if(ret == -1){
1979
perror_plus("setuid");
1980
}
1981
}
1982
}
1983
1984
/* Removes the GPGME temp directory and all files inside */
1985
if(tempdir_created){
1986
struct dirent **direntries = NULL;
1987
struct dirent *direntry = NULL;
1988
int numentries = scandir(tempdir, &direntries, notdotentries,
1989
alphasort);
1990
if (numentries > 0){
1991
for(int i = 0; i < numentries; i++){
1992
direntry = direntries[i];
1993
char *fullname = NULL;
1994
ret = asprintf(&fullname, "%s/%s", tempdir,
1995
direntry->d_name);
1996
if(ret < 0){
1997
perror_plus("asprintf");
1998
continue;
1999
}
2000
ret = remove(fullname);
2001
if(ret == -1){
2002
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2003
strerror(errno));
2004
}
2005
free(fullname);
2006
}
2007
}
2008
2009
/* need to clean even if 0 because man page doesn't specify */
2010
free(direntries);
2011
if (numentries == -1){
2012
perror_plus("scandir");
2013
}
2014
ret = rmdir(tempdir);
2015
if(ret == -1 and errno != ENOENT){
2016
perror_plus("rmdir");
2017
}
2018
}
2019
2020
if(quit_now){
2021
sigemptyset(&old_sigterm_action.sa_mask);
2022
old_sigterm_action.sa_handler = SIG_DFL;
2023
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2024
&old_sigterm_action,
2025
NULL));
2026
if(ret == -1){
2027
perror_plus("sigaction");
2028
}
2029
do {
2030
ret = raise(signal_received);
2031
} while(ret != 0 and errno == EINTR);
2032
if(ret != 0){
2033
perror_plus("raise");
2034
abort();
2035
}
2036
TEMP_FAILURE_RETRY(pause());
2037
}
2038
2039
return exitcode;
998
999
if (debug){
1000
fprintf(stderr, "%s exiting\n", argv[0]);
1001
}
1002
1003
/* Cleanup things */
1004
if (sb != NULL)
1005
avahi_s_service_browser_free(sb);
1006
1007
if (mc.server != NULL)
1008
avahi_server_free(mc.server);
1009
1010
if (mc.simple_poll != NULL)
1011
avahi_simple_poll_free(mc.simple_poll);
1012
free(pubkeyfile);
1013
free(seckeyfile);
1014
1015
if (gnutls_initalized){
1016
gnutls_certificate_free_credentials (mc.cred);
1017
gnutls_global_deinit ();
1018
}
1019
1020
return exitcode;
2040
1021
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0