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- Committer: teddy at bsnet
- Date: 2011-11-11 20:19:01 UTC
- mto: (505.2.5 mandos-client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 525.
- Revision ID: teddy@fukt.bsnet.se-20111111201901-a92of11prspld20x
* plugins.d/mandos-client.c (main): Add "DELAY" environment variable.
Check return value from setenv().
Check return value from setenv().
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- files removed:
- network-protocol.txt
- files renamed:
- mandos-client.c => plugin-runner.c
- mandos-client.xml => plugin-runner.xml
- plugins.d/password-request.c => plugins.d/mandos-client.c
- plugins.d/password-request.xml => plugins.d/mandos-client.xml
- files modified:
- Makefile
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 © 2007-2008 Teddy Hogeborn & Björn Påhlsson
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
13
14
*
14
15
* This program is free software: you can redistribute it and/or
15
16
* modify it under the terms of the GNU General Public License as
25
26
* along with this program. If not, see
26
27
* <http://www.gnu.org/licenses/>.
27
28
*
28
* Contact the authors at <mandos@fukt.bsnet.se>.
29
* Contact the authors at <mandos@recompile.se>.
29
30
*/
30
31
31
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
32
34
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
33
37
#define _FILE_OFFSET_BITS 64
34
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
36
37
#include <stdio.h> /* fprintf(), stderr, fwrite(), stdout,
38
ferror() */
38
#endif
39
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
39
44
#include <stdint.h> /* uint16_t, uint32_t */
40
45
#include <stddef.h> /* NULL, size_t, ssize_t */
41
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
42
srand() */
43
#include <stdbool.h> /* bool, true */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
#include <stdbool.h> /* bool, false, true */
44
49
#include <string.h> /* memset(), strcmp(), strlen(),
45
strerror(), memcpy(), strcpy() */
46
#include <sys/ioctl.h> /* ioctl */
47
#include <net/if.h> /* ifreq, SIOCGIFFLAGS, SIOCSIFFLAGS,
48
IFF_UP */
50
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
49
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
50
53
sockaddr_in6, PF_INET6,
51
SOCK_STREAM, INET6_ADDRSTRLEN,
52
uid_t, gid_t */
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
53
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
54
struct in6_addr, inet_pton(),
55
connect() */
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() */
56
64
#include <assert.h> /* assert() */
57
#include <errno.h> /* perror(), errno */
58
#include <time.h> /* time() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
59
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
60
69
SIOCSIFFLAGS, if_indextoname(),
61
70
if_nametoindex(), IF_NAMESIZE */
71
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
*/
62
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
63
getuid(), getgid(), setuid(),
64
setgid() */
65
#include <netinet/in.h>
66
#include <arpa/inet.h> /* inet_pton(), htons */
67
#include <iso646.h> /* not, and */
75
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
78
#include <iso646.h> /* not, or, and */
68
79
#include <argp.h> /* struct argp_option, error_t, struct
69
80
argp_state, struct argp,
70
81
argp_parse(), ARGP_KEY_ARG,
71
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__ */
72
92
73
93
/* Avahi */
74
94
/* All Avahi types, constants and functions
82
102
#include <avahi-common/error.h>
83
103
84
104
/* GnuTLS */
85
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and functions
105
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
106
functions:
86
107
gnutls_*
87
108
init_gnutls_session(),
88
109
GNUTLS_* */
89
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
110
#include <gnutls/openpgp.h>
111
/* gnutls_certificate_set_openpgp_key_file(),
90
112
GNUTLS_OPENPGP_FMT_BASE64 */
91
113
92
114
/* GPGME */
93
#include <gpgme.h> /* All GPGME types, constants and functions
115
#include <gpgme.h> /* All GPGME types, constants and
116
functions:
94
117
gpgme_*
95
118
GPGME_PROTOCOL_OpenPGP,
96
119
GPG_ERR_NO_* */
97
120
98
121
#define BUFFER_SIZE 256
99
122
123
#define PATHDIR "/conf/conf.d/mandos"
124
#define SECKEY "seckey.txt"
125
#define PUBKEY "pubkey.txt"
126
#define HOOKDIR "/lib/mandos/network-hooks.d"
127
100
128
bool debug = false;
101
static const char *keydir = "/conf/conf.d/mandos";
102
129
static const char mandos_protocol_version[] = "1";
103
const char *argp_program_version = "mandosclient 0.9";
104
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
130
const char *argp_program_version = "mandos-client " VERSION;
131
const char *argp_program_bug_address = "<mandos@recompile.se>";
132
static const char sys_class_net[] = "/sys/class/net";
133
char *connect_to = NULL;
134
135
/* Doubly linked list that need to be circularly linked when used */
136
typedef struct server{
137
const char *ip;
138
uint16_t port;
139
AvahiIfIndex if_index;
140
int af;
141
struct timespec last_seen;
142
struct server *next;
143
struct server *prev;
144
} server;
105
145
106
146
/* Used for passing in values through the Avahi callback functions */
107
147
typedef struct {
111
151
unsigned int dh_bits;
112
152
gnutls_dh_params_t dh_params;
113
153
const char *priority;
154
gpgme_ctx_t ctx;
155
server *current_server;
114
156
} mandos_context;
115
157
158
/* global context so signal handler can reach it*/
159
mandos_context mc = { .simple_poll = NULL, .server = NULL,
160
.dh_bits = 1024, .priority = "SECURE256"
161
":!CTYPE-X.509:+CTYPE-OPENPGP",
162
.current_server = NULL };
163
164
sig_atomic_t quit_now = 0;
165
int signal_received = 0;
166
167
/* Function to use when printing errors */
168
void perror_plus(const char *print_text){
169
fprintf(stderr, "Mandos plugin %s: ",
170
program_invocation_short_name);
171
perror(print_text);
172
}
173
116
174
/*
117
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
118
* "buffer_capacity" is how much is currently allocated,
175
* Make additional room in "buffer" for at least BUFFER_SIZE more
176
* bytes. "buffer_capacity" is how much is currently allocated,
119
177
* "buffer_length" is how much is already used.
120
178
*/
121
size_t adjustbuffer(char **buffer, size_t buffer_length,
179
size_t incbuffer(char **buffer, size_t buffer_length,
122
180
size_t buffer_capacity){
123
if (buffer_length + BUFFER_SIZE > buffer_capacity){
181
if(buffer_length + BUFFER_SIZE > buffer_capacity){
124
182
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
125
if (buffer == NULL){
183
if(buffer == NULL){
126
184
return 0;
127
185
}
128
186
buffer_capacity += BUFFER_SIZE;
130
188
return buffer_capacity;
131
189
}
132
190
191
/* Add server to set of servers to retry periodically */
192
int add_server(const char *ip, uint16_t port,
193
AvahiIfIndex if_index,
194
int af){
195
int ret;
196
server *new_server = malloc(sizeof(server));
197
if(new_server == NULL){
198
perror_plus("malloc");
199
return -1;
200
}
201
*new_server = (server){ .ip = strdup(ip),
202
.port = port,
203
.if_index = if_index,
204
.af = af };
205
if(new_server->ip == NULL){
206
perror_plus("strdup");
207
return -1;
208
}
209
/* Special case of first server */
210
if (mc.current_server == NULL){
211
new_server->next = new_server;
212
new_server->prev = new_server;
213
mc.current_server = new_server;
214
/* Place the new server last in the list */
215
} else {
216
new_server->next = mc.current_server;
217
new_server->prev = mc.current_server->prev;
218
new_server->prev->next = new_server;
219
mc.current_server->prev = new_server;
220
}
221
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
222
if(ret == -1){
223
perror_plus("clock_gettime");
224
return -1;
225
}
226
return 0;
227
}
228
133
229
/*
134
* Decrypt OpenPGP data using keyrings in HOMEDIR.
135
* Returns -1 on error
230
* Initialize GPGME.
136
231
*/
137
static ssize_t pgp_packet_decrypt (const char *cryptotext,
138
size_t crypto_size,
139
char **plaintext,
140
const char *homedir){
141
gpgme_data_t dh_crypto, dh_plain;
142
gpgme_ctx_t ctx;
232
static bool init_gpgme(const char *seckey,
233
const char *pubkey, const char *tempdir){
143
234
gpgme_error_t rc;
144
ssize_t ret;
145
size_t plaintext_capacity = 0;
146
ssize_t plaintext_length = 0;
147
235
gpgme_engine_info_t engine_info;
148
236
149
if (debug){
150
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
237
238
/*
239
* Helper function to insert pub and seckey to the engine keyring.
240
*/
241
bool import_key(const char *filename){
242
int ret;
243
int fd;
244
gpgme_data_t pgp_data;
245
246
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
247
if(fd == -1){
248
perror_plus("open");
249
return false;
250
}
251
252
rc = gpgme_data_new_from_fd(&pgp_data, fd);
253
if(rc != GPG_ERR_NO_ERROR){
254
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
255
gpgme_strsource(rc), gpgme_strerror(rc));
256
return false;
257
}
258
259
rc = gpgme_op_import(mc.ctx, pgp_data);
260
if(rc != GPG_ERR_NO_ERROR){
261
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
262
gpgme_strsource(rc), gpgme_strerror(rc));
263
return false;
264
}
265
266
ret = (int)TEMP_FAILURE_RETRY(close(fd));
267
if(ret == -1){
268
perror_plus("close");
269
}
270
gpgme_data_release(pgp_data);
271
return true;
272
}
273
274
if(debug){
275
fprintf(stderr, "Initializing GPGME\n");
151
276
}
152
277
153
278
/* Init GPGME */
154
279
gpgme_check_version(NULL);
155
280
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
156
if (rc != GPG_ERR_NO_ERROR){
281
if(rc != GPG_ERR_NO_ERROR){
157
282
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
158
283
gpgme_strsource(rc), gpgme_strerror(rc));
159
return -1;
284
return false;
160
285
}
161
286
162
287
/* Set GPGME home directory for the OpenPGP engine only */
163
rc = gpgme_get_engine_info (&engine_info);
164
if (rc != GPG_ERR_NO_ERROR){
288
rc = gpgme_get_engine_info(&engine_info);
289
if(rc != GPG_ERR_NO_ERROR){
165
290
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
166
291
gpgme_strsource(rc), gpgme_strerror(rc));
167
return -1;
292
return false;
168
293
}
169
294
while(engine_info != NULL){
170
295
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
171
296
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
172
engine_info->file_name, homedir);
297
engine_info->file_name, tempdir);
173
298
break;
174
299
}
175
300
engine_info = engine_info->next;
176
301
}
177
302
if(engine_info == NULL){
178
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
179
return -1;
303
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
304
return false;
305
}
306
307
/* Create new GPGME "context" */
308
rc = gpgme_new(&(mc.ctx));
309
if(rc != GPG_ERR_NO_ERROR){
310
fprintf(stderr, "bad gpgme_new: %s: %s\n",
311
gpgme_strsource(rc), gpgme_strerror(rc));
312
return false;
313
}
314
315
if(not import_key(pubkey) or not import_key(seckey)){
316
return false;
317
}
318
319
return true;
320
}
321
322
/*
323
* Decrypt OpenPGP data.
324
* Returns -1 on error
325
*/
326
static ssize_t pgp_packet_decrypt(const char *cryptotext,
327
size_t crypto_size,
328
char **plaintext){
329
gpgme_data_t dh_crypto, dh_plain;
330
gpgme_error_t rc;
331
ssize_t ret;
332
size_t plaintext_capacity = 0;
333
ssize_t plaintext_length = 0;
334
335
if(debug){
336
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
180
337
}
181
338
182
339
/* Create new GPGME data buffer from memory cryptotext */
183
340
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
184
341
0);
185
if (rc != GPG_ERR_NO_ERROR){
342
if(rc != GPG_ERR_NO_ERROR){
186
343
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
187
344
gpgme_strsource(rc), gpgme_strerror(rc));
188
345
return -1;
190
347
191
348
/* Create new empty GPGME data buffer for the plaintext */
192
349
rc = gpgme_data_new(&dh_plain);
193
if (rc != GPG_ERR_NO_ERROR){
350
if(rc != GPG_ERR_NO_ERROR){
194
351
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
195
352
gpgme_strsource(rc), gpgme_strerror(rc));
196
353
gpgme_data_release(dh_crypto);
197
354
return -1;
198
355
}
199
356
200
/* Create new GPGME "context" */
201
rc = gpgme_new(&ctx);
202
if (rc != GPG_ERR_NO_ERROR){
203
fprintf(stderr, "bad gpgme_new: %s: %s\n",
204
gpgme_strsource(rc), gpgme_strerror(rc));
205
plaintext_length = -1;
206
goto decrypt_end;
207
}
208
209
357
/* Decrypt data from the cryptotext data buffer to the plaintext
210
358
data buffer */
211
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
212
if (rc != GPG_ERR_NO_ERROR){
359
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
360
if(rc != GPG_ERR_NO_ERROR){
213
361
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
214
362
gpgme_strsource(rc), gpgme_strerror(rc));
215
363
plaintext_length = -1;
216
goto decrypt_end;
217
}
218
219
if(debug){
220
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
221
}
222
223
if (debug){
224
gpgme_decrypt_result_t result;
225
result = gpgme_op_decrypt_result(ctx);
226
if (result == NULL){
227
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
228
} else {
229
fprintf(stderr, "Unsupported algorithm: %s\n",
230
result->unsupported_algorithm);
231
fprintf(stderr, "Wrong key usage: %d\n",
232
result->wrong_key_usage);
233
if(result->file_name != NULL){
234
fprintf(stderr, "File name: %s\n", result->file_name);
235
}
236
gpgme_recipient_t recipient;
237
recipient = result->recipients;
238
if(recipient){
364
if(debug){
365
gpgme_decrypt_result_t result;
366
result = gpgme_op_decrypt_result(mc.ctx);
367
if(result == NULL){
368
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
369
} else {
370
fprintf(stderr, "Unsupported algorithm: %s\n",
371
result->unsupported_algorithm);
372
fprintf(stderr, "Wrong key usage: %u\n",
373
result->wrong_key_usage);
374
if(result->file_name != NULL){
375
fprintf(stderr, "File name: %s\n", result->file_name);
376
}
377
gpgme_recipient_t recipient;
378
recipient = result->recipients;
239
379
while(recipient != NULL){
240
380
fprintf(stderr, "Public key algorithm: %s\n",
241
381
gpgme_pubkey_algo_name(recipient->pubkey_algo));
247
387
}
248
388
}
249
389
}
390
goto decrypt_end;
391
}
392
393
if(debug){
394
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
250
395
}
251
396
252
397
/* Seek back to the beginning of the GPGME plaintext data buffer */
253
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
254
perror("pgpme_data_seek");
398
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
399
perror_plus("gpgme_data_seek");
255
400
plaintext_length = -1;
256
401
goto decrypt_end;
257
402
}
258
403
259
404
*plaintext = NULL;
260
405
while(true){
261
plaintext_capacity = adjustbuffer(plaintext,
406
plaintext_capacity = incbuffer(plaintext,
262
407
(size_t)plaintext_length,
263
408
plaintext_capacity);
264
if (plaintext_capacity == 0){
265
perror("adjustbuffer");
409
if(plaintext_capacity == 0){
410
perror_plus("incbuffer");
266
411
plaintext_length = -1;
267
412
goto decrypt_end;
268
413
}
270
415
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
271
416
BUFFER_SIZE);
272
417
/* Print the data, if any */
273
if (ret == 0){
418
if(ret == 0){
274
419
/* EOF */
275
420
break;
276
421
}
277
422
if(ret < 0){
278
perror("gpgme_data_read");
423
perror_plus("gpgme_data_read");
279
424
plaintext_length = -1;
280
425
goto decrypt_end;
281
426
}
282
427
plaintext_length += ret;
283
428
}
284
429
285
430
if(debug){
286
431
fprintf(stderr, "Decrypted password is: ");
287
432
for(ssize_t i = 0; i < plaintext_length; i++){
300
445
return plaintext_length;
301
446
}
302
447
303
static const char * safer_gnutls_strerror (int value) {
304
const char *ret = gnutls_strerror (value);
305
if (ret == NULL)
448
static const char * safer_gnutls_strerror(int value){
449
const char *ret = gnutls_strerror(value); /* Spurious warning from
450
-Wunreachable-code */
451
if(ret == NULL)
306
452
ret = "(unknown)";
307
453
return ret;
308
454
}
313
459
fprintf(stderr, "GnuTLS: %s", string);
314
460
}
315
461
316
static int init_gnutls_global(mandos_context *mc,
317
const char *pubkeyfile,
318
const char *seckeyfile){
462
static int init_gnutls_global(const char *pubkeyfilename,
463
const char *seckeyfilename){
319
464
int ret;
320
465
321
466
if(debug){
323
468
}
324
469
325
470
ret = gnutls_global_init();
326
if (ret != GNUTLS_E_SUCCESS) {
327
fprintf (stderr, "GnuTLS global_init: %s\n",
328
safer_gnutls_strerror(ret));
471
if(ret != GNUTLS_E_SUCCESS){
472
fprintf(stderr, "GnuTLS global_init: %s\n",
473
safer_gnutls_strerror(ret));
329
474
return -1;
330
475
}
331
476
332
if (debug){
477
if(debug){
333
478
/* "Use a log level over 10 to enable all debugging options."
334
479
* - GnuTLS manual
335
480
*/
338
483
}
339
484
340
485
/* OpenPGP credentials */
341
gnutls_certificate_allocate_credentials(&mc->cred);
342
if (ret != GNUTLS_E_SUCCESS){
343
fprintf (stderr, "GnuTLS memory error: %s\n",
344
safer_gnutls_strerror(ret));
345
gnutls_global_deinit ();
486
ret = gnutls_certificate_allocate_credentials(&mc.cred);
487
if(ret != GNUTLS_E_SUCCESS){
488
fprintf(stderr, "GnuTLS memory error: %s\n",
489
safer_gnutls_strerror(ret));
490
gnutls_global_deinit();
346
491
return -1;
347
492
}
348
493
349
494
if(debug){
350
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
351
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
352
seckeyfile);
495
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
496
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
497
seckeyfilename);
353
498
}
354
499
355
500
ret = gnutls_certificate_set_openpgp_key_file
356
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
357
if (ret != GNUTLS_E_SUCCESS) {
501
(mc.cred, pubkeyfilename, seckeyfilename,
502
GNUTLS_OPENPGP_FMT_BASE64);
503
if(ret != GNUTLS_E_SUCCESS){
358
504
fprintf(stderr,
359
505
"Error[%d] while reading the OpenPGP key pair ('%s',"
360
" '%s')\n", ret, pubkeyfile, seckeyfile);
361
fprintf(stdout, "The GnuTLS error is: %s\n",
506
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
507
fprintf(stderr, "The GnuTLS error is: %s\n",
362
508
safer_gnutls_strerror(ret));
363
509
goto globalfail;
364
510
}
365
511
366
512
/* GnuTLS server initialization */
367
ret = gnutls_dh_params_init(&mc->dh_params);
368
if (ret != GNUTLS_E_SUCCESS) {
369
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
370
" %s\n", safer_gnutls_strerror(ret));
371
goto globalfail;
372
}
373
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
374
if (ret != GNUTLS_E_SUCCESS) {
375
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
376
safer_gnutls_strerror(ret));
377
goto globalfail;
378
}
379
380
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
381
513
ret = gnutls_dh_params_init(&mc.dh_params);
514
if(ret != GNUTLS_E_SUCCESS){
515
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
516
" %s\n", safer_gnutls_strerror(ret));
517
goto globalfail;
518
}
519
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
520
if(ret != GNUTLS_E_SUCCESS){
521
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
522
safer_gnutls_strerror(ret));
523
goto globalfail;
524
}
525
526
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
527
382
528
return 0;
383
529
384
530
globalfail:
385
386
gnutls_certificate_free_credentials(mc->cred);
531
532
gnutls_certificate_free_credentials(mc.cred);
387
533
gnutls_global_deinit();
534
gnutls_dh_params_deinit(mc.dh_params);
388
535
return -1;
389
390
536
}
391
537
392
static int init_gnutls_session(mandos_context *mc,
393
gnutls_session_t *session){
538
static int init_gnutls_session(gnutls_session_t *session){
394
539
int ret;
395
540
/* GnuTLS session creation */
396
ret = gnutls_init(session, GNUTLS_SERVER);
397
if (ret != GNUTLS_E_SUCCESS){
541
do {
542
ret = gnutls_init(session, GNUTLS_SERVER);
543
if(quit_now){
544
return -1;
545
}
546
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
547
if(ret != GNUTLS_E_SUCCESS){
398
548
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
399
549
safer_gnutls_strerror(ret));
400
550
}
401
551
402
552
{
403
553
const char *err;
404
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
405
if (ret != GNUTLS_E_SUCCESS) {
554
do {
555
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
556
if(quit_now){
557
gnutls_deinit(*session);
558
return -1;
559
}
560
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
561
if(ret != GNUTLS_E_SUCCESS){
406
562
fprintf(stderr, "Syntax error at: %s\n", err);
407
563
fprintf(stderr, "GnuTLS error: %s\n",
408
564
safer_gnutls_strerror(ret));
409
gnutls_deinit (*session);
565
gnutls_deinit(*session);
410
566
return -1;
411
567
}
412
568
}
413
569
414
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
415
mc->cred);
416
if (ret != GNUTLS_E_SUCCESS) {
570
do {
571
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
572
mc.cred);
573
if(quit_now){
574
gnutls_deinit(*session);
575
return -1;
576
}
577
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
578
if(ret != GNUTLS_E_SUCCESS){
417
579
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
418
580
safer_gnutls_strerror(ret));
419
gnutls_deinit (*session);
581
gnutls_deinit(*session);
420
582
return -1;
421
583
}
422
584
423
585
/* ignore client certificate if any. */
424
gnutls_certificate_server_set_request (*session,
425
GNUTLS_CERT_IGNORE);
586
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
426
587
427
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
588
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
428
589
429
590
return 0;
430
591
}
436
597
/* Called when a Mandos server is found */
437
598
static int start_mandos_communication(const char *ip, uint16_t port,
438
599
AvahiIfIndex if_index,
439
mandos_context *mc){
440
int ret, tcp_sd;
441
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
600
int af){
601
int ret, tcp_sd = -1;
602
ssize_t sret;
603
union {
604
struct sockaddr_in in;
605
struct sockaddr_in6 in6;
606
} to;
442
607
char *buffer = NULL;
443
char *decrypted_buffer;
608
char *decrypted_buffer = NULL;
444
609
size_t buffer_length = 0;
445
610
size_t buffer_capacity = 0;
446
ssize_t decrypted_buffer_size;
447
611
size_t written;
448
int retval = 0;
449
char interface[IF_NAMESIZE];
612
int retval = -1;
450
613
gnutls_session_t session;
451
452
ret = init_gnutls_session (mc, &session);
453
if (ret != 0){
454
return -1;
455
}
456
457
if(debug){
458
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
459
ip, port);
460
}
461
462
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
463
if(tcp_sd < 0) {
464
perror("socket");
465
return -1;
466
}
467
468
if(debug){
469
if(if_indextoname((unsigned int)if_index, interface) == NULL){
470
perror("if_indextoname");
471
return -1;
472
}
473
fprintf(stderr, "Binding to interface %s\n", interface);
474
}
475
476
memset(&to,0,sizeof(to)); /* Spurious warning */
477
to.in6.sin6_family = AF_INET6;
478
/* It would be nice to have a way to detect if we were passed an
479
IPv4 address here. Now we assume an IPv6 address. */
480
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
481
if (ret < 0 ){
482
perror("inet_pton");
483
return -1;
614
int pf; /* Protocol family */
615
616
errno = 0;
617
618
if(quit_now){
619
errno = EINTR;
620
return -1;
621
}
622
623
switch(af){
624
case AF_INET6:
625
pf = PF_INET6;
626
break;
627
case AF_INET:
628
pf = PF_INET;
629
break;
630
default:
631
fprintf(stderr, "Bad address family: %d\n", af);
632
errno = EINVAL;
633
return -1;
634
}
635
636
ret = init_gnutls_session(&session);
637
if(ret != 0){
638
return -1;
639
}
640
641
if(debug){
642
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
643
"\n", ip, port);
644
}
645
646
tcp_sd = socket(pf, SOCK_STREAM, 0);
647
if(tcp_sd < 0){
648
int e = errno;
649
perror_plus("socket");
650
errno = e;
651
goto mandos_end;
652
}
653
654
if(quit_now){
655
errno = EINTR;
656
goto mandos_end;
657
}
658
659
memset(&to, 0, sizeof(to));
660
if(af == AF_INET6){
661
to.in6.sin6_family = (sa_family_t)af;
662
ret = inet_pton(af, ip, &to.in6.sin6_addr);
663
} else { /* IPv4 */
664
to.in.sin_family = (sa_family_t)af;
665
ret = inet_pton(af, ip, &to.in.sin_addr);
666
}
667
if(ret < 0 ){
668
int e = errno;
669
perror_plus("inet_pton");
670
errno = e;
671
goto mandos_end;
484
672
}
485
673
if(ret == 0){
674
int e = errno;
486
675
fprintf(stderr, "Bad address: %s\n", ip);
487
return -1;
488
}
489
to.in6.sin6_port = htons(port); /* Spurious warning */
676
errno = e;
677
goto mandos_end;
678
}
679
if(af == AF_INET6){
680
to.in6.sin6_port = htons(port); /* Spurious warnings from
681
-Wconversion and
682
-Wunreachable-code */
683
684
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
685
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
686
-Wunreachable-code*/
687
if(if_index == AVAHI_IF_UNSPEC){
688
fprintf(stderr, "An IPv6 link-local address is incomplete"
689
" without a network interface\n");
690
errno = EINVAL;
691
goto mandos_end;
692
}
693
/* Set the network interface number as scope */
694
to.in6.sin6_scope_id = (uint32_t)if_index;
695
}
696
} else {
697
to.in.sin_port = htons(port); /* Spurious warnings from
698
-Wconversion and
699
-Wunreachable-code */
700
}
490
701
491
to.in6.sin6_scope_id = (uint32_t)if_index;
702
if(quit_now){
703
errno = EINTR;
704
goto mandos_end;
705
}
492
706
493
707
if(debug){
494
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
495
char addrstr[INET6_ADDRSTRLEN] = "";
496
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
497
sizeof(addrstr)) == NULL){
498
perror("inet_ntop");
708
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
709
char interface[IF_NAMESIZE];
710
if(if_indextoname((unsigned int)if_index, interface) == NULL){
711
perror_plus("if_indextoname");
712
} else {
713
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
714
ip, interface, port);
715
}
716
} else {
717
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
718
port);
719
}
720
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
721
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
722
const char *pcret;
723
if(af == AF_INET6){
724
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
725
sizeof(addrstr));
726
} else {
727
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
728
sizeof(addrstr));
729
}
730
if(pcret == NULL){
731
perror_plus("inet_ntop");
499
732
} else {
500
733
if(strcmp(addrstr, ip) != 0){
501
734
fprintf(stderr, "Canonical address form: %s\n", addrstr);
503
736
}
504
737
}
505
738
506
ret = connect(tcp_sd, &to.in, sizeof(to));
507
if (ret < 0){
508
perror("connect");
509
return -1;
510
}
511
739
if(quit_now){
740
errno = EINTR;
741
goto mandos_end;
742
}
743
744
if(af == AF_INET6){
745
ret = connect(tcp_sd, &to.in6, sizeof(to));
746
} else {
747
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
748
}
749
if(ret < 0){
750
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
751
int e = errno;
752
perror_plus("connect");
753
errno = e;
754
}
755
goto mandos_end;
756
}
757
758
if(quit_now){
759
errno = EINTR;
760
goto mandos_end;
761
}
762
512
763
const char *out = mandos_protocol_version;
513
764
written = 0;
514
while (true){
765
while(true){
515
766
size_t out_size = strlen(out);
516
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
767
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
517
768
out_size - written));
518
if (ret == -1){
519
perror("write");
520
retval = -1;
769
if(ret == -1){
770
int e = errno;
771
perror_plus("write");
772
errno = e;
521
773
goto mandos_end;
522
774
}
523
775
written += (size_t)ret;
524
776
if(written < out_size){
525
777
continue;
526
778
} else {
527
if (out == mandos_protocol_version){
779
if(out == mandos_protocol_version){
528
780
written = 0;
529
781
out = "\r\n";
530
782
} else {
531
783
break;
532
784
}
533
785
}
786
787
if(quit_now){
788
errno = EINTR;
789
goto mandos_end;
790
}
534
791
}
535
792
536
793
if(debug){
537
794
fprintf(stderr, "Establishing TLS session with %s\n", ip);
538
795
}
539
796
540
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
541
542
do{
543
ret = gnutls_handshake (session);
797
if(quit_now){
798
errno = EINTR;
799
goto mandos_end;
800
}
801
802
/* Spurious warning from -Wint-to-pointer-cast */
803
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
804
805
if(quit_now){
806
errno = EINTR;
807
goto mandos_end;
808
}
809
810
do {
811
ret = gnutls_handshake(session);
812
if(quit_now){
813
errno = EINTR;
814
goto mandos_end;
815
}
544
816
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
545
817
546
if (ret != GNUTLS_E_SUCCESS){
818
if(ret != GNUTLS_E_SUCCESS){
547
819
if(debug){
548
820
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
549
gnutls_perror (ret);
821
gnutls_perror(ret);
550
822
}
551
retval = -1;
823
errno = EPROTO;
552
824
goto mandos_end;
553
825
}
554
826
555
827
/* Read OpenPGP packet that contains the wanted password */
556
828
557
829
if(debug){
558
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
830
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
559
831
ip);
560
832
}
561
833
562
834
while(true){
563
buffer_capacity = adjustbuffer(&buffer, buffer_length,
835
836
if(quit_now){
837
errno = EINTR;
838
goto mandos_end;
839
}
840
841
buffer_capacity = incbuffer(&buffer, buffer_length,
564
842
buffer_capacity);
565
if (buffer_capacity == 0){
566
perror("adjustbuffer");
567
retval = -1;
568
goto mandos_end;
569
}
570
571
ret = gnutls_record_recv(session, buffer+buffer_length,
572
BUFFER_SIZE);
573
if (ret == 0){
843
if(buffer_capacity == 0){
844
int e = errno;
845
perror_plus("incbuffer");
846
errno = e;
847
goto mandos_end;
848
}
849
850
if(quit_now){
851
errno = EINTR;
852
goto mandos_end;
853
}
854
855
sret = gnutls_record_recv(session, buffer+buffer_length,
856
BUFFER_SIZE);
857
if(sret == 0){
574
858
break;
575
859
}
576
if (ret < 0){
577
switch(ret){
860
if(sret < 0){
861
switch(sret){
578
862
case GNUTLS_E_INTERRUPTED:
579
863
case GNUTLS_E_AGAIN:
580
864
break;
581
865
case GNUTLS_E_REHANDSHAKE:
582
do{
583
ret = gnutls_handshake (session);
866
do {
867
ret = gnutls_handshake(session);
868
869
if(quit_now){
870
errno = EINTR;
871
goto mandos_end;
872
}
584
873
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
585
if (ret < 0){
874
if(ret < 0){
586
875
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
587
gnutls_perror (ret);
588
retval = -1;
876
gnutls_perror(ret);
877
errno = EPROTO;
589
878
goto mandos_end;
590
879
}
591
880
break;
592
881
default:
593
882
fprintf(stderr, "Unknown error while reading data from"
594
883
" encrypted session with Mandos server\n");
595
retval = -1;
596
gnutls_bye (session, GNUTLS_SHUT_RDWR);
884
gnutls_bye(session, GNUTLS_SHUT_RDWR);
885
errno = EIO;
597
886
goto mandos_end;
598
887
}
599
888
} else {
600
buffer_length += (size_t) ret;
889
buffer_length += (size_t) sret;
601
890
}
602
891
}
603
892
605
894
fprintf(stderr, "Closing TLS session\n");
606
895
}
607
896
608
gnutls_bye (session, GNUTLS_SHUT_RDWR);
609
610
if (buffer_length > 0){
897
if(quit_now){
898
errno = EINTR;
899
goto mandos_end;
900
}
901
902
do {
903
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
904
if(quit_now){
905
errno = EINTR;
906
goto mandos_end;
907
}
908
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
909
910
if(buffer_length > 0){
911
ssize_t decrypted_buffer_size;
611
912
decrypted_buffer_size = pgp_packet_decrypt(buffer,
612
913
buffer_length,
613
&decrypted_buffer,
614
keydir);
615
if (decrypted_buffer_size >= 0){
914
&decrypted_buffer);
915
if(decrypted_buffer_size >= 0){
916
616
917
written = 0;
617
918
while(written < (size_t) decrypted_buffer_size){
618
ret = (int)fwrite (decrypted_buffer + written, 1,
619
(size_t)decrypted_buffer_size - written,
620
stdout);
919
if(quit_now){
920
errno = EINTR;
921
goto mandos_end;
922
}
923
924
ret = (int)fwrite(decrypted_buffer + written, 1,
925
(size_t)decrypted_buffer_size - written,
926
stdout);
621
927
if(ret == 0 and ferror(stdout)){
928
int e = errno;
622
929
if(debug){
623
930
fprintf(stderr, "Error writing encrypted data: %s\n",
624
931
strerror(errno));
625
932
}
626
retval = -1;
627
break;
933
errno = e;
934
goto mandos_end;
628
935
}
629
936
written += (size_t)ret;
630
937
}
631
free(decrypted_buffer);
632
} else {
633
retval = -1;
938
retval = 0;
634
939
}
635
940
}
636
941
637
942
/* Shutdown procedure */
638
943
639
944
mandos_end:
640
free(buffer);
641
close(tcp_sd);
642
gnutls_deinit (session);
945
{
946
int e = errno;
947
free(decrypted_buffer);
948
free(buffer);
949
if(tcp_sd >= 0){
950
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
951
}
952
if(ret == -1){
953
if(e == 0){
954
e = errno;
955
}
956
perror_plus("close");
957
}
958
gnutls_deinit(session);
959
errno = e;
960
if(quit_now){
961
errno = EINTR;
962
retval = -1;
963
}
964
}
643
965
return retval;
644
966
}
645
967
646
968
static void resolve_callback(AvahiSServiceResolver *r,
647
969
AvahiIfIndex interface,
648
AVAHI_GCC_UNUSED AvahiProtocol protocol,
970
AvahiProtocol proto,
649
971
AvahiResolverEvent event,
650
972
const char *name,
651
973
const char *type,
656
978
AVAHI_GCC_UNUSED AvahiStringList *txt,
657
979
AVAHI_GCC_UNUSED AvahiLookupResultFlags
658
980
flags,
659
void* userdata) {
660
mandos_context *mc = userdata;
661
assert(r); /* Spurious warning */
981
AVAHI_GCC_UNUSED void* userdata){
982
assert(r);
662
983
663
984
/* Called whenever a service has been resolved successfully or
664
985
timed out */
665
986
666
switch (event) {
987
if(quit_now){
988
return;
989
}
990
991
switch(event){
667
992
default:
668
993
case AVAHI_RESOLVER_FAILURE:
669
994
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
670
995
" of type '%s' in domain '%s': %s\n", name, type, domain,
671
avahi_strerror(avahi_server_errno(mc->server)));
996
avahi_strerror(avahi_server_errno(mc.server)));
672
997
break;
673
998
674
999
case AVAHI_RESOLVER_FOUND:
676
1001
char ip[AVAHI_ADDRESS_STR_MAX];
677
1002
avahi_address_snprint(ip, sizeof(ip), address);
678
1003
if(debug){
679
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %d) on"
680
" port %d\n", name, host_name, ip, interface, port);
1004
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1005
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1006
ip, (intmax_t)interface, port);
681
1007
}
682
int ret = start_mandos_communication(ip, port, interface, mc);
683
if (ret == 0){
684
exit(EXIT_SUCCESS);
1008
int ret = start_mandos_communication(ip, port, interface,
1009
avahi_proto_to_af(proto));
1010
if(ret == 0){
1011
avahi_simple_poll_quit(mc.simple_poll);
1012
} else {
1013
ret = add_server(ip, port, interface,
1014
avahi_proto_to_af(proto));
685
1015
}
686
1016
}
687
1017
}
688
1018
avahi_s_service_resolver_free(r);
689
1019
}
690
1020
691
static void browse_callback( AvahiSServiceBrowser *b,
692
AvahiIfIndex interface,
693
AvahiProtocol protocol,
694
AvahiBrowserEvent event,
695
const char *name,
696
const char *type,
697
const char *domain,
698
AVAHI_GCC_UNUSED AvahiLookupResultFlags
699
flags,
700
void* userdata) {
701
mandos_context *mc = userdata;
702
assert(b); /* Spurious warning */
1021
static void browse_callback(AvahiSServiceBrowser *b,
1022
AvahiIfIndex interface,
1023
AvahiProtocol protocol,
1024
AvahiBrowserEvent event,
1025
const char *name,
1026
const char *type,
1027
const char *domain,
1028
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1029
flags,
1030
AVAHI_GCC_UNUSED void* userdata){
1031
assert(b);
703
1032
704
1033
/* Called whenever a new services becomes available on the LAN or
705
1034
is removed from the LAN */
706
1035
707
switch (event) {
1036
if(quit_now){
1037
return;
1038
}
1039
1040
switch(event){
708
1041
default:
709
1042
case AVAHI_BROWSER_FAILURE:
710
1043
711
1044
fprintf(stderr, "(Avahi browser) %s\n",
712
avahi_strerror(avahi_server_errno(mc->server)));
713
avahi_simple_poll_quit(mc->simple_poll);
1045
avahi_strerror(avahi_server_errno(mc.server)));
1046
avahi_simple_poll_quit(mc.simple_poll);
714
1047
return;
715
1048
716
1049
case AVAHI_BROWSER_NEW:
719
1052
the callback function is called the Avahi server will free the
720
1053
resolver for us. */
721
1054
722
if (!(avahi_s_service_resolver_new(mc->server, interface,
723
protocol, name, type, domain,
724
AVAHI_PROTO_INET6, 0,
725
resolve_callback, mc)))
1055
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1056
name, type, domain, protocol, 0,
1057
resolve_callback, NULL) == NULL)
726
1058
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
727
name, avahi_strerror(avahi_server_errno(mc->server)));
1059
name, avahi_strerror(avahi_server_errno(mc.server)));
728
1060
break;
729
1061
730
1062
case AVAHI_BROWSER_REMOVE:
739
1071
}
740
1072
}
741
1073
742
/* Combines file name and path and returns the malloced new
743
string. some sane checks could/should be added */
744
static const char *combinepath(const char *first, const char *second){
745
size_t f_len = strlen(first);
746
size_t s_len = strlen(second);
747
char *tmp = malloc(f_len + s_len + 2);
748
if (tmp == NULL){
749
return NULL;
750
}
751
if(f_len > 0){
752
memcpy(tmp, first, f_len); /* Spurious warning */
753
}
754
tmp[f_len] = '/';
755
if(s_len > 0){
756
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
757
}
758
tmp[f_len + 1 + s_len] = '\0';
759
return tmp;
760
}
761
1074
/* Signal handler that stops main loop after SIGTERM */
1075
static void handle_sigterm(int sig){
1076
if(quit_now){
1077
return;
1078
}
1079
quit_now = 1;
1080
signal_received = sig;
1081
int old_errno = errno;
1082
/* set main loop to exit */
1083
if(mc.simple_poll != NULL){
1084
avahi_simple_poll_quit(mc.simple_poll);
1085
}
1086
errno = old_errno;
1087
}
1088
1089
bool get_flags(const char *ifname, struct ifreq *ifr){
1090
int ret;
1091
1092
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1093
if(s < 0){
1094
perror_plus("socket");
1095
return false;
1096
}
1097
strcpy(ifr->ifr_name, ifname);
1098
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1099
if(ret == -1){
1100
if(debug){
1101
perror_plus("ioctl SIOCGIFFLAGS");
1102
}
1103
return false;
1104
}
1105
return true;
1106
}
1107
1108
bool good_flags(const char *ifname, const struct ifreq *ifr){
1109
1110
/* Reject the loopback device */
1111
if(ifr->ifr_flags & IFF_LOOPBACK){
1112
if(debug){
1113
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1114
ifname);
1115
}
1116
return false;
1117
}
1118
/* Accept point-to-point devices only if connect_to is specified */
1119
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1120
if(debug){
1121
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1122
ifname);
1123
}
1124
return true;
1125
}
1126
/* Otherwise, reject non-broadcast-capable devices */
1127
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1128
if(debug){
1129
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1130
ifname);
1131
}
1132
return false;
1133
}
1134
/* Reject non-ARP interfaces (including dummy interfaces) */
1135
if(ifr->ifr_flags & IFF_NOARP){
1136
if(debug){
1137
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n", ifname);
1138
}
1139
return false;
1140
}
1141
1142
/* Accept this device */
1143
if(debug){
1144
fprintf(stderr, "Interface \"%s\" is good\n", ifname);
1145
}
1146
return true;
1147
}
1148
1149
/*
1150
* This function determines if a directory entry in /sys/class/net
1151
* corresponds to an acceptable network device.
1152
* (This function is passed to scandir(3) as a filter function.)
1153
*/
1154
int good_interface(const struct dirent *if_entry){
1155
if(if_entry->d_name[0] == '.'){
1156
return 0;
1157
}
1158
1159
struct ifreq ifr;
1160
if(not get_flags(if_entry->d_name, &ifr)){
1161
if(debug){
1162
fprintf(stderr, "Failed to get flags for interface \"%s\"\n",
1163
if_entry->d_name);
1164
}
1165
return 0;
1166
}
1167
1168
if(not good_flags(if_entry->d_name, &ifr)){
1169
return 0;
1170
}
1171
return 1;
1172
}
1173
1174
/*
1175
* This function determines if a directory entry in /sys/class/net
1176
* corresponds to an acceptable network device which is up.
1177
* (This function is passed to scandir(3) as a filter function.)
1178
*/
1179
int up_interface(const struct dirent *if_entry){
1180
if(if_entry->d_name[0] == '.'){
1181
return 0;
1182
}
1183
1184
struct ifreq ifr;
1185
if(not get_flags(if_entry->d_name, &ifr)){
1186
if(debug){
1187
fprintf(stderr, "Failed to get flags for interface \"%s\"\n",
1188
if_entry->d_name);
1189
}
1190
return 0;
1191
}
1192
1193
/* Reject down interfaces */
1194
if(not (ifr.ifr_flags & IFF_UP)){
1195
if(debug){
1196
fprintf(stderr, "Rejecting down interface \"%s\"\n",
1197
if_entry->d_name);
1198
}
1199
return 0;
1200
}
1201
1202
/* Reject non-running interfaces */
1203
if(not (ifr.ifr_flags & IFF_RUNNING)){
1204
if(debug){
1205
fprintf(stderr, "Rejecting non-running interface \"%s\"\n",
1206
if_entry->d_name);
1207
}
1208
return 0;
1209
}
1210
1211
if(not good_flags(if_entry->d_name, &ifr)){
1212
return 0;
1213
}
1214
return 1;
1215
}
1216
1217
int notdotentries(const struct dirent *direntry){
1218
/* Skip "." and ".." */
1219
if(direntry->d_name[0] == '.'
1220
and (direntry->d_name[1] == '\0'
1221
or (direntry->d_name[1] == '.'
1222
and direntry->d_name[2] == '\0'))){
1223
return 0;
1224
}
1225
return 1;
1226
}
1227
1228
/* Is this directory entry a runnable program? */
1229
int runnable_hook(const struct dirent *direntry){
1230
int ret;
1231
struct stat st;
1232
1233
if((direntry->d_name)[0] == '\0'){
1234
/* Empty name? */
1235
return 0;
1236
}
1237
1238
/* Save pointer to last character */
1239
char *end = strchr(direntry->d_name, '\0')-1;
1240
1241
if(*end == '~'){
1242
/* Backup name~ */
1243
return 0;
1244
}
1245
1246
if(((direntry->d_name)[0] == '#')
1247
and (*end == '#')){
1248
/* Temporary #name# */
1249
return 0;
1250
}
1251
1252
/* XXX more rules here */
1253
1254
ret = stat(direntry->d_name, &st);
1255
if(ret == -1){
1256
if(debug){
1257
perror_plus("Could not stat plugin");
1258
}
1259
return 0;
1260
}
1261
if(not (S_ISREG(st.st_mode))){
1262
/* Not a regular file */
1263
return 0;
1264
}
1265
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1266
/* Not executable */
1267
return 0;
1268
}
1269
return 1;
1270
}
1271
1272
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1273
int ret;
1274
struct timespec now;
1275
struct timespec waited_time;
1276
intmax_t block_time;
1277
1278
while(true){
1279
if(mc.current_server == NULL){
1280
if (debug){
1281
fprintf(stderr,
1282
"Wait until first server is found. No timeout!\n");
1283
}
1284
ret = avahi_simple_poll_iterate(s, -1);
1285
} else {
1286
if (debug){
1287
fprintf(stderr, "Check current_server if we should run it,"
1288
" or wait\n");
1289
}
1290
/* the current time */
1291
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1292
if(ret == -1){
1293
perror_plus("clock_gettime");
1294
return -1;
1295
}
1296
/* Calculating in ms how long time between now and server
1297
who we visted longest time ago. Now - last seen. */
1298
waited_time.tv_sec = (now.tv_sec
1299
- mc.current_server->last_seen.tv_sec);
1300
waited_time.tv_nsec = (now.tv_nsec
1301
- mc.current_server->last_seen.tv_nsec);
1302
/* total time is 10s/10,000ms.
1303
Converting to s from ms by dividing by 1,000,
1304
and ns to ms by dividing by 1,000,000. */
1305
block_time = ((retry_interval
1306
- ((intmax_t)waited_time.tv_sec * 1000))
1307
- ((intmax_t)waited_time.tv_nsec / 1000000));
1308
1309
if (debug){
1310
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1311
}
1312
1313
if(block_time <= 0){
1314
ret = start_mandos_communication(mc.current_server->ip,
1315
mc.current_server->port,
1316
mc.current_server->if_index,
1317
mc.current_server->af);
1318
if(ret == 0){
1319
avahi_simple_poll_quit(mc.simple_poll);
1320
return 0;
1321
}
1322
ret = clock_gettime(CLOCK_MONOTONIC,
1323
&mc.current_server->last_seen);
1324
if(ret == -1){
1325
perror_plus("clock_gettime");
1326
return -1;
1327
}
1328
mc.current_server = mc.current_server->next;
1329
block_time = 0; /* Call avahi to find new Mandos
1330
servers, but don't block */
1331
}
1332
1333
ret = avahi_simple_poll_iterate(s, (int)block_time);
1334
}
1335
if(ret != 0){
1336
if (ret > 0 or errno != EINTR) {
1337
return (ret != 1) ? ret : 0;
1338
}
1339
}
1340
}
1341
}
762
1342
763
1343
int main(int argc, char *argv[]){
764
AvahiSServiceBrowser *sb = NULL;
765
int error;
766
int ret;
767
int exitcode = EXIT_SUCCESS;
768
const char *interface = "eth0";
769
struct ifreq network;
770
int sd;
771
uid_t uid;
772
gid_t gid;
773
char *connect_to = NULL;
774
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
775
const char *pubkeyfile = "pubkey.txt";
776
const char *seckeyfile = "seckey.txt";
777
mandos_context mc = { .simple_poll = NULL, .server = NULL,
778
.dh_bits = 1024, .priority = "SECURE256"};
779
bool gnutls_initalized = false;
780
781
{
782
struct argp_option options[] = {
783
{ .name = "debug", .key = 128,
784
.doc = "Debug mode", .group = 3 },
785
{ .name = "connect", .key = 'c',
786
.arg = "IP",
787
.doc = "Connect directly to a sepcified mandos server",
788
.group = 1 },
789
{ .name = "interface", .key = 'i',
790
.arg = "INTERFACE",
791
.doc = "Interface that Avahi will conntect through",
792
.group = 1 },
793
{ .name = "keydir", .key = 'd',
794
.arg = "KEYDIR",
795
.doc = "Directory where the openpgp keyring is",
796
.group = 1 },
797
{ .name = "seckey", .key = 's',
798
.arg = "SECKEY",
799
.doc = "Secret openpgp key for gnutls authentication",
800
.group = 1 },
801
{ .name = "pubkey", .key = 'p',
802
.arg = "PUBKEY",
803
.doc = "Public openpgp key for gnutls authentication",
804
.group = 2 },
805
{ .name = "dh-bits", .key = 129,
806
.arg = "BITS",
807
.doc = "dh-bits to use in gnutls communication",
808
.group = 2 },
809
{ .name = "priority", .key = 130,
810
.arg = "PRIORITY",
811
.doc = "GNUTLS priority", .group = 1 },
812
{ .name = NULL }
813
};
814
815
816
error_t parse_opt (int key, char *arg,
817
struct argp_state *state) {
818
/* Get the INPUT argument from `argp_parse', which we know is
819
a pointer to our plugin list pointer. */
820
switch (key) {
821
case 128:
822
debug = true;
823
break;
824
case 'c':
825
connect_to = arg;
826
break;
827
case 'i':
828
interface = arg;
829
break;
830
case 'd':
831
keydir = arg;
832
break;
833
case 's':
834
seckeyfile = arg;
835
break;
836
case 'p':
837
pubkeyfile = arg;
838
break;
839
case 129:
840
errno = 0;
841
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
842
if (errno){
843
perror("strtol");
844
exit(EXIT_FAILURE);
845
}
846
break;
847
case 130:
848
mc.priority = arg;
849
break;
850
case ARGP_KEY_ARG:
851
argp_usage (state);
852
break;
853
case ARGP_KEY_END:
854
break;
855
default:
856
return ARGP_ERR_UNKNOWN;
857
}
858
return 0;
859
}
860
861
struct argp argp = { .options = options, .parser = parse_opt,
862
.args_doc = "",
863
.doc = "Mandos client -- Get and decrypt"
864
" passwords from mandos server" };
865
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
866
if (ret == ARGP_ERR_UNKNOWN){
867
fprintf(stderr, "Unkown error while parsing arguments\n");
1344
AvahiSServiceBrowser *sb = NULL;
1345
int error;
1346
int ret;
1347
intmax_t tmpmax;
1348
char *tmp;
1349
int exitcode = EXIT_SUCCESS;
1350
const char *interface = "";
1351
struct ifreq network;
1352
int sd = -1;
1353
bool take_down_interface = false;
1354
uid_t uid;
1355
gid_t gid;
1356
char tempdir[] = "/tmp/mandosXXXXXX";
1357
bool tempdir_created = false;
1358
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1359
const char *seckey = PATHDIR "/" SECKEY;
1360
const char *pubkey = PATHDIR "/" PUBKEY;
1361
1362
bool gnutls_initialized = false;
1363
bool gpgme_initialized = false;
1364
float delay = 2.5f;
1365
double retry_interval = 10; /* 10s between trying a server and
1366
retrying the same server again */
1367
1368
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1369
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1370
1371
uid = getuid();
1372
gid = getgid();
1373
1374
/* Lower any group privileges we might have, just to be safe */
1375
errno = 0;
1376
ret = setgid(gid);
1377
if(ret == -1){
1378
perror_plus("setgid");
1379
}
1380
1381
/* Lower user privileges (temporarily) */
1382
errno = 0;
1383
ret = seteuid(uid);
1384
if(ret == -1){
1385
perror_plus("seteuid");
1386
}
1387
1388
if(quit_now){
1389
goto end;
1390
}
1391
1392
{
1393
struct argp_option options[] = {
1394
{ .name = "debug", .key = 128,
1395
.doc = "Debug mode", .group = 3 },
1396
{ .name = "connect", .key = 'c',
1397
.arg = "ADDRESS:PORT",
1398
.doc = "Connect directly to a specific Mandos server",
1399
.group = 1 },
1400
{ .name = "interface", .key = 'i',
1401
.arg = "NAME",
1402
.doc = "Network interface that will be used to search for"
1403
" Mandos servers",
1404
.group = 1 },
1405
{ .name = "seckey", .key = 's',
1406
.arg = "FILE",
1407
.doc = "OpenPGP secret key file base name",
1408
.group = 1 },
1409
{ .name = "pubkey", .key = 'p',
1410
.arg = "FILE",
1411
.doc = "OpenPGP public key file base name",
1412
.group = 2 },
1413
{ .name = "dh-bits", .key = 129,
1414
.arg = "BITS",
1415
.doc = "Bit length of the prime number used in the"
1416
" Diffie-Hellman key exchange",
1417
.group = 2 },
1418
{ .name = "priority", .key = 130,
1419
.arg = "STRING",
1420
.doc = "GnuTLS priority string for the TLS handshake",
1421
.group = 1 },
1422
{ .name = "delay", .key = 131,
1423
.arg = "SECONDS",
1424
.doc = "Maximum delay to wait for interface startup",
1425
.group = 2 },
1426
{ .name = "retry", .key = 132,
1427
.arg = "SECONDS",
1428
.doc = "Retry interval used when denied by the mandos server",
1429
.group = 2 },
1430
/*
1431
* These reproduce what we would get without ARGP_NO_HELP
1432
*/
1433
{ .name = "help", .key = '?',
1434
.doc = "Give this help list", .group = -1 },
1435
{ .name = "usage", .key = -3,
1436
.doc = "Give a short usage message", .group = -1 },
1437
{ .name = "version", .key = 'V',
1438
.doc = "Print program version", .group = -1 },
1439
{ .name = NULL }
1440
};
1441
1442
error_t parse_opt(int key, char *arg,
1443
struct argp_state *state){
1444
errno = 0;
1445
switch(key){
1446
case 128: /* --debug */
1447
debug = true;
1448
break;
1449
case 'c': /* --connect */
1450
connect_to = arg;
1451
break;
1452
case 'i': /* --interface */
1453
interface = arg;
1454
break;
1455
case 's': /* --seckey */
1456
seckey = arg;
1457
break;
1458
case 'p': /* --pubkey */
1459
pubkey = arg;
1460
break;
1461
case 129: /* --dh-bits */
1462
errno = 0;
1463
tmpmax = strtoimax(arg, &tmp, 10);
1464
if(errno != 0 or tmp == arg or *tmp != '\0'
1465
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1466
argp_error(state, "Bad number of DH bits");
1467
}
1468
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1469
break;
1470
case 130: /* --priority */
1471
mc.priority = arg;
1472
break;
1473
case 131: /* --delay */
1474
errno = 0;
1475
delay = strtof(arg, &tmp);
1476
if(errno != 0 or tmp == arg or *tmp != '\0'){
1477
argp_error(state, "Bad delay");
1478
}
1479
case 132: /* --retry */
1480
errno = 0;
1481
retry_interval = strtod(arg, &tmp);
1482
if(errno != 0 or tmp == arg or *tmp != '\0'
1483
or (retry_interval * 1000) > INT_MAX
1484
or retry_interval < 0){
1485
argp_error(state, "Bad retry interval");
1486
}
1487
break;
1488
/*
1489
* These reproduce what we would get without ARGP_NO_HELP
1490
*/
1491
case '?': /* --help */
1492
argp_state_help(state, state->out_stream,
1493
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1494
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1495
case -3: /* --usage */
1496
argp_state_help(state, state->out_stream,
1497
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1498
case 'V': /* --version */
1499
fprintf(state->out_stream, "%s\n", argp_program_version);
1500
exit(argp_err_exit_status);
1501
break;
1502
default:
1503
return ARGP_ERR_UNKNOWN;
1504
}
1505
return errno;
1506
}
1507
1508
struct argp argp = { .options = options, .parser = parse_opt,
1509
.args_doc = "",
1510
.doc = "Mandos client -- Get and decrypt"
1511
" passwords from a Mandos server" };
1512
ret = argp_parse(&argp, argc, argv,
1513
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1514
switch(ret){
1515
case 0:
1516
break;
1517
case ENOMEM:
1518
default:
1519
errno = ret;
1520
perror_plus("argp_parse");
1521
exitcode = EX_OSERR;
1522
goto end;
1523
case EINVAL:
1524
exitcode = EX_USAGE;
1525
goto end;
1526
}
1527
}
1528
1529
{
1530
/* Work around Debian bug #633582:
1531
<http://bugs.debian.org/633582> */
1532
struct stat st;
1533
1534
/* Re-raise priviliges */
1535
errno = 0;
1536
ret = seteuid(0);
1537
if(ret == -1){
1538
perror_plus("seteuid");
1539
}
1540
1541
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1542
int seckey_fd = open(seckey, O_RDONLY);
1543
if(seckey_fd == -1){
1544
perror_plus("open");
1545
} else {
1546
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1547
if(ret == -1){
1548
perror_plus("fstat");
1549
} else {
1550
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1551
ret = fchown(seckey_fd, uid, gid);
1552
if(ret == -1){
1553
perror_plus("fchown");
1554
}
1555
}
1556
}
1557
TEMP_FAILURE_RETRY(close(seckey_fd));
1558
}
1559
}
1560
1561
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1562
int pubkey_fd = open(pubkey, O_RDONLY);
1563
if(pubkey_fd == -1){
1564
perror_plus("open");
1565
} else {
1566
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1567
if(ret == -1){
1568
perror_plus("fstat");
1569
} else {
1570
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1571
ret = fchown(pubkey_fd, uid, gid);
1572
if(ret == -1){
1573
perror_plus("fchown");
1574
}
1575
}
1576
}
1577
TEMP_FAILURE_RETRY(close(pubkey_fd));
1578
}
1579
}
1580
1581
/* Lower privileges */
1582
errno = 0;
1583
ret = seteuid(uid);
1584
if(ret == -1){
1585
perror_plus("seteuid");
1586
}
1587
}
1588
1589
/* Find network hooks and run them */
1590
{
1591
struct dirent **direntries;
1592
struct dirent *direntry;
1593
int numhooks = scandir(HOOKDIR, &direntries, runnable_hook,
1594
alphasort);
1595
int devnull = open("/dev/null", O_RDONLY);
1596
for(int i = 0; i < numhooks; i++){
1597
direntry = direntries[0];
1598
char *fullname = NULL;
1599
ret = asprintf(&fullname, "%s/%s", tempdir,
1600
direntry->d_name);
1601
if(ret < 0){
1602
perror_plus("asprintf");
1603
continue;
1604
}
1605
pid_t hook_pid = fork();
1606
if(hook_pid == 0){
1607
/* Child */
1608
dup2(devnull, STDIN_FILENO);
1609
close(devnull);
1610
dup2(STDERR_FILENO, STDOUT_FILENO);
1611
ret = setenv("DEVICE", interface, 1);
1612
if(ret == -1){
1613
perror_plus("setenv");
1614
exit(1);
1615
}
1616
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1617
if(ret == -1){
1618
perror_plus("setenv");
1619
exit(1);
1620
}
1621
ret = setenv("MODE", "start", 1);
1622
if(ret == -1){
1623
perror_plus("setenv");
1624
exit(1);
1625
}
1626
char *delaystring;
1627
ret = asprintf(&delaystring, "%f", delay);
1628
if(ret == -1){
1629
perror_plus("asprintf");
1630
exit(1);
1631
}
1632
ret = setenv("DELAY", delaystring, 1);
1633
if(ret == -1){
1634
free(delaystring);
1635
perror_plus("setenv");
1636
exit(1);
1637
}
1638
free(delaystring);
1639
ret = execl(fullname, direntry->d_name, "start", NULL);
1640
perror_plus("execl");
1641
}
1642
free(fullname);
1643
if(quit_now){
1644
goto end;
1645
}
1646
}
1647
close(devnull);
1648
}
1649
1650
if(not debug){
1651
avahi_set_log_function(empty_log);
1652
}
1653
1654
if(interface[0] == '\0'){
1655
struct dirent **direntries;
1656
/* First look for interfaces that are up */
1657
ret = scandir(sys_class_net, &direntries, up_interface,
1658
alphasort);
1659
if(ret == 0){
1660
/* No up interfaces, look for any good interfaces */
1661
free(direntries);
1662
ret = scandir(sys_class_net, &direntries, good_interface,
1663
alphasort);
1664
}
1665
if(ret >= 1){
1666
/* Pick the first interface returned */
1667
interface = strdup(direntries[0]->d_name);
1668
if(debug){
1669
fprintf(stderr, "Using interface \"%s\"\n", interface);
1670
}
1671
if(interface == NULL){
1672
perror_plus("malloc");
1673
free(direntries);
868
1674
exitcode = EXIT_FAILURE;
869
1675
goto end;
870
1676
}
871
}
872
873
pubkeyfile = combinepath(keydir, pubkeyfile);
874
if (pubkeyfile == NULL){
875
perror("combinepath");
1677
free(direntries);
1678
} else {
1679
free(direntries);
1680
fprintf(stderr, "Could not find a network interface\n");
876
1681
exitcode = EXIT_FAILURE;
877
1682
goto end;
878
1683
}
879
880
seckeyfile = combinepath(keydir, seckeyfile);
881
if (seckeyfile == NULL){
882
perror("combinepath");
883
goto end;
884
}
885
886
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
887
if (ret == -1){
888
fprintf(stderr, "init_gnutls_global\n");
889
goto end;
890
} else {
891
gnutls_initalized = true;
892
}
893
894
uid = getuid();
895
gid = getgid();
896
897
ret = setuid(uid);
898
if (ret == -1){
899
perror("setuid");
900
}
901
902
setgid(gid);
903
if (ret == -1){
904
perror("setgid");
905
}
906
1684
}
1685
1686
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1687
from the signal handler */
1688
/* Initialize the pseudo-RNG for Avahi */
1689
srand((unsigned int) time(NULL));
1690
mc.simple_poll = avahi_simple_poll_new();
1691
if(mc.simple_poll == NULL){
1692
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1693
exitcode = EX_UNAVAILABLE;
1694
goto end;
1695
}
1696
1697
sigemptyset(&sigterm_action.sa_mask);
1698
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1699
if(ret == -1){
1700
perror_plus("sigaddset");
1701
exitcode = EX_OSERR;
1702
goto end;
1703
}
1704
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1705
if(ret == -1){
1706
perror_plus("sigaddset");
1707
exitcode = EX_OSERR;
1708
goto end;
1709
}
1710
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1711
if(ret == -1){
1712
perror_plus("sigaddset");
1713
exitcode = EX_OSERR;
1714
goto end;
1715
}
1716
/* Need to check if the handler is SIG_IGN before handling:
1717
| [[info:libc:Initial Signal Actions]] |
1718
| [[info:libc:Basic Signal Handling]] |
1719
*/
1720
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1721
if(ret == -1){
1722
perror_plus("sigaction");
1723
return EX_OSERR;
1724
}
1725
if(old_sigterm_action.sa_handler != SIG_IGN){
1726
ret = sigaction(SIGINT, &sigterm_action, NULL);
1727
if(ret == -1){
1728
perror_plus("sigaction");
1729
exitcode = EX_OSERR;
1730
goto end;
1731
}
1732
}
1733
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1734
if(ret == -1){
1735
perror_plus("sigaction");
1736
return EX_OSERR;
1737
}
1738
if(old_sigterm_action.sa_handler != SIG_IGN){
1739
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1740
if(ret == -1){
1741
perror_plus("sigaction");
1742
exitcode = EX_OSERR;
1743
goto end;
1744
}
1745
}
1746
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1747
if(ret == -1){
1748
perror_plus("sigaction");
1749
return EX_OSERR;
1750
}
1751
if(old_sigterm_action.sa_handler != SIG_IGN){
1752
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1753
if(ret == -1){
1754
perror_plus("sigaction");
1755
exitcode = EX_OSERR;
1756
goto end;
1757
}
1758
}
1759
1760
/* If the interface is down, bring it up */
1761
if(strcmp(interface, "none") != 0){
907
1762
if_index = (AvahiIfIndex) if_nametoindex(interface);
908
1763
if(if_index == 0){
909
1764
fprintf(stderr, "No such interface: \"%s\"\n", interface);
910
exit(EXIT_FAILURE);
911
}
912
913
if(connect_to != NULL){
914
/* Connect directly, do not use Zeroconf */
915
/* (Mainly meant for debugging) */
916
char *address = strrchr(connect_to, ':');
917
if(address == NULL){
918
fprintf(stderr, "No colon in address\n");
919
exitcode = EXIT_FAILURE;
920
goto end;
921
}
922
errno = 0;
923
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
924
if(errno){
925
perror("Bad port number");
926
exitcode = EXIT_FAILURE;
927
goto end;
928
}
929
*address = '\0';
930
address = connect_to;
931
ret = start_mandos_communication(address, port, if_index, &mc);
932
if(ret < 0){
933
exitcode = EXIT_FAILURE;
934
} else {
935
exitcode = EXIT_SUCCESS;
936
}
937
goto end;
938
}
939
940
/* If the interface is down, bring it up */
941
{
942
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
943
if(sd < 0) {
944
perror("socket");
945
exitcode = EXIT_FAILURE;
946
goto end;
947
}
948
strcpy(network.ifr_name, interface); /* Spurious warning */
949
ret = ioctl(sd, SIOCGIFFLAGS, &network);
950
if(ret == -1){
951
perror("ioctl SIOCGIFFLAGS");
952
exitcode = EXIT_FAILURE;
953
goto end;
954
}
955
if((network.ifr_flags & IFF_UP) == 0){
956
network.ifr_flags |= IFF_UP;
1765
exitcode = EX_UNAVAILABLE;
1766
goto end;
1767
}
1768
1769
if(quit_now){
1770
goto end;
1771
}
1772
1773
/* Re-raise priviliges */
1774
errno = 0;
1775
ret = seteuid(0);
1776
if(ret == -1){
1777
perror_plus("seteuid");
1778
}
1779
1780
#ifdef __linux__
1781
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1782
messages about the network interface to mess up the prompt */
1783
ret = klogctl(8, NULL, 5);
1784
bool restore_loglevel = true;
1785
if(ret == -1){
1786
restore_loglevel = false;
1787
perror_plus("klogctl");
1788
}
1789
#endif /* __linux__ */
1790
1791
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1792
if(sd < 0){
1793
perror_plus("socket");
1794
exitcode = EX_OSERR;
1795
#ifdef __linux__
1796
if(restore_loglevel){
1797
ret = klogctl(7, NULL, 0);
1798
if(ret == -1){
1799
perror_plus("klogctl");
1800
}
1801
}
1802
#endif /* __linux__ */
1803
/* Lower privileges */
1804
errno = 0;
1805
ret = seteuid(uid);
1806
if(ret == -1){
1807
perror_plus("seteuid");
1808
}
1809
goto end;
1810
}
1811
strcpy(network.ifr_name, interface);
1812
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1813
if(ret == -1){
1814
perror_plus("ioctl SIOCGIFFLAGS");
1815
#ifdef __linux__
1816
if(restore_loglevel){
1817
ret = klogctl(7, NULL, 0);
1818
if(ret == -1){
1819
perror_plus("klogctl");
1820
}
1821
}
1822
#endif /* __linux__ */
1823
exitcode = EX_OSERR;
1824
/* Lower privileges */
1825
errno = 0;
1826
ret = seteuid(uid);
1827
if(ret == -1){
1828
perror_plus("seteuid");
1829
}
1830
goto end;
1831
}
1832
if((network.ifr_flags & IFF_UP) == 0){
1833
network.ifr_flags |= IFF_UP;
1834
take_down_interface = true;
1835
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1836
if(ret == -1){
1837
take_down_interface = false;
1838
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1839
exitcode = EX_OSERR;
1840
#ifdef __linux__
1841
if(restore_loglevel){
1842
ret = klogctl(7, NULL, 0);
1843
if(ret == -1){
1844
perror_plus("klogctl");
1845
}
1846
}
1847
#endif /* __linux__ */
1848
/* Lower privileges */
1849
errno = 0;
1850
ret = seteuid(uid);
1851
if(ret == -1){
1852
perror_plus("seteuid");
1853
}
1854
goto end;
1855
}
1856
}
1857
/* Sleep checking until interface is running.
1858
Check every 0.25s, up to total time of delay */
1859
for(int i=0; i < delay * 4; i++){
1860
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1861
if(ret == -1){
1862
perror_plus("ioctl SIOCGIFFLAGS");
1863
} else if(network.ifr_flags & IFF_RUNNING){
1864
break;
1865
}
1866
struct timespec sleeptime = { .tv_nsec = 250000000 };
1867
ret = nanosleep(&sleeptime, NULL);
1868
if(ret == -1 and errno != EINTR){
1869
perror_plus("nanosleep");
1870
}
1871
}
1872
if(not take_down_interface){
1873
/* We won't need the socket anymore */
1874
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1875
if(ret == -1){
1876
perror_plus("close");
1877
}
1878
}
1879
#ifdef __linux__
1880
if(restore_loglevel){
1881
/* Restores kernel loglevel to default */
1882
ret = klogctl(7, NULL, 0);
1883
if(ret == -1){
1884
perror_plus("klogctl");
1885
}
1886
}
1887
#endif /* __linux__ */
1888
/* Lower privileges */
1889
errno = 0;
1890
if(take_down_interface){
1891
/* Lower privileges */
1892
ret = seteuid(uid);
1893
if(ret == -1){
1894
perror_plus("seteuid");
1895
}
1896
} else {
1897
/* Lower privileges permanently */
1898
ret = setuid(uid);
1899
if(ret == -1){
1900
perror_plus("setuid");
1901
}
1902
}
1903
}
1904
1905
if(quit_now){
1906
goto end;
1907
}
1908
1909
ret = init_gnutls_global(pubkey, seckey);
1910
if(ret == -1){
1911
fprintf(stderr, "init_gnutls_global failed\n");
1912
exitcode = EX_UNAVAILABLE;
1913
goto end;
1914
} else {
1915
gnutls_initialized = true;
1916
}
1917
1918
if(quit_now){
1919
goto end;
1920
}
1921
1922
if(mkdtemp(tempdir) == NULL){
1923
perror_plus("mkdtemp");
1924
goto end;
1925
}
1926
tempdir_created = true;
1927
1928
if(quit_now){
1929
goto end;
1930
}
1931
1932
if(not init_gpgme(pubkey, seckey, tempdir)){
1933
fprintf(stderr, "init_gpgme failed\n");
1934
exitcode = EX_UNAVAILABLE;
1935
goto end;
1936
} else {
1937
gpgme_initialized = true;
1938
}
1939
1940
if(quit_now){
1941
goto end;
1942
}
1943
1944
if(connect_to != NULL){
1945
/* Connect directly, do not use Zeroconf */
1946
/* (Mainly meant for debugging) */
1947
char *address = strrchr(connect_to, ':');
1948
if(address == NULL){
1949
fprintf(stderr, "No colon in address\n");
1950
exitcode = EX_USAGE;
1951
goto end;
1952
}
1953
1954
if(quit_now){
1955
goto end;
1956
}
1957
1958
uint16_t port;
1959
errno = 0;
1960
tmpmax = strtoimax(address+1, &tmp, 10);
1961
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1962
or tmpmax != (uint16_t)tmpmax){
1963
fprintf(stderr, "Bad port number\n");
1964
exitcode = EX_USAGE;
1965
goto end;
1966
}
1967
1968
if(quit_now){
1969
goto end;
1970
}
1971
1972
port = (uint16_t)tmpmax;
1973
*address = '\0';
1974
/* Colon in address indicates IPv6 */
1975
int af;
1976
if(strchr(connect_to, ':') != NULL){
1977
af = AF_INET6;
1978
/* Accept [] around IPv6 address - see RFC 5952 */
1979
if(connect_to[0] == '[' and address[-1] == ']')
1980
{
1981
connect_to++;
1982
address[-1] = '\0';
1983
}
1984
} else {
1985
af = AF_INET;
1986
}
1987
address = connect_to;
1988
1989
if(quit_now){
1990
goto end;
1991
}
1992
1993
while(not quit_now){
1994
ret = start_mandos_communication(address, port, if_index, af);
1995
if(quit_now or ret == 0){
1996
break;
1997
}
1998
if(debug){
1999
fprintf(stderr, "Retrying in %d seconds\n",
2000
(int)retry_interval);
2001
}
2002
sleep((int)retry_interval);
2003
}
2004
2005
if (not quit_now){
2006
exitcode = EXIT_SUCCESS;
2007
}
2008
2009
goto end;
2010
}
2011
2012
if(quit_now){
2013
goto end;
2014
}
2015
2016
{
2017
AvahiServerConfig config;
2018
/* Do not publish any local Zeroconf records */
2019
avahi_server_config_init(&config);
2020
config.publish_hinfo = 0;
2021
config.publish_addresses = 0;
2022
config.publish_workstation = 0;
2023
config.publish_domain = 0;
2024
2025
/* Allocate a new server */
2026
mc.server = avahi_server_new(avahi_simple_poll_get
2027
(mc.simple_poll), &config, NULL,
2028
NULL, &error);
2029
2030
/* Free the Avahi configuration data */
2031
avahi_server_config_free(&config);
2032
}
2033
2034
/* Check if creating the Avahi server object succeeded */
2035
if(mc.server == NULL){
2036
fprintf(stderr, "Failed to create Avahi server: %s\n",
2037
avahi_strerror(error));
2038
exitcode = EX_UNAVAILABLE;
2039
goto end;
2040
}
2041
2042
if(quit_now){
2043
goto end;
2044
}
2045
2046
/* Create the Avahi service browser */
2047
sb = avahi_s_service_browser_new(mc.server, if_index,
2048
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2049
NULL, 0, browse_callback, NULL);
2050
if(sb == NULL){
2051
fprintf(stderr, "Failed to create service browser: %s\n",
2052
avahi_strerror(avahi_server_errno(mc.server)));
2053
exitcode = EX_UNAVAILABLE;
2054
goto end;
2055
}
2056
2057
if(quit_now){
2058
goto end;
2059
}
2060
2061
/* Run the main loop */
2062
2063
if(debug){
2064
fprintf(stderr, "Starting Avahi loop search\n");
2065
}
2066
2067
ret = avahi_loop_with_timeout(mc.simple_poll,
2068
(int)(retry_interval * 1000));
2069
if(debug){
2070
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
2071
(ret == 0) ? "successfully" : "with error");
2072
}
2073
2074
end:
2075
2076
if(debug){
2077
fprintf(stderr, "%s exiting\n", argv[0]);
2078
}
2079
2080
/* Cleanup things */
2081
if(sb != NULL)
2082
avahi_s_service_browser_free(sb);
2083
2084
if(mc.server != NULL)
2085
avahi_server_free(mc.server);
2086
2087
if(mc.simple_poll != NULL)
2088
avahi_simple_poll_free(mc.simple_poll);
2089
2090
if(gnutls_initialized){
2091
gnutls_certificate_free_credentials(mc.cred);
2092
gnutls_global_deinit();
2093
gnutls_dh_params_deinit(mc.dh_params);
2094
}
2095
2096
if(gpgme_initialized){
2097
gpgme_release(mc.ctx);
2098
}
2099
2100
/* Cleans up the circular linked list of Mandos servers the client
2101
has seen */
2102
if(mc.current_server != NULL){
2103
mc.current_server->prev->next = NULL;
2104
while(mc.current_server != NULL){
2105
server *next = mc.current_server->next;
2106
free(mc.current_server);
2107
mc.current_server = next;
2108
}
2109
}
2110
2111
/* XXX run network hooks "stop" here */
2112
2113
/* Take down the network interface */
2114
if(take_down_interface){
2115
/* Re-raise priviliges */
2116
errno = 0;
2117
ret = seteuid(0);
2118
if(ret == -1){
2119
perror_plus("seteuid");
2120
}
2121
if(geteuid() == 0){
2122
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2123
if(ret == -1){
2124
perror_plus("ioctl SIOCGIFFLAGS");
2125
} else if(network.ifr_flags & IFF_UP) {
2126
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
957
2127
ret = ioctl(sd, SIOCSIFFLAGS, &network);
958
2128
if(ret == -1){
959
perror("ioctl SIOCSIFFLAGS");
960
exitcode = EXIT_FAILURE;
961
goto end;
962
}
963
}
964
close(sd);
965
}
966
967
if (not debug){
968
avahi_set_log_function(empty_log);
969
}
970
971
/* Initialize the pseudo-RNG for Avahi */
972
srand((unsigned int) time(NULL));
973
974
/* Allocate main Avahi loop object */
975
mc.simple_poll = avahi_simple_poll_new();
976
if (mc.simple_poll == NULL) {
977
fprintf(stderr, "Avahi: Failed to create simple poll"
978
" object.\n");
979
exitcode = EXIT_FAILURE;
980
goto end;
981
}
982
983
{
984
AvahiServerConfig config;
985
/* Do not publish any local Zeroconf records */
986
avahi_server_config_init(&config);
987
config.publish_hinfo = 0;
988
config.publish_addresses = 0;
989
config.publish_workstation = 0;
990
config.publish_domain = 0;
991
992
/* Allocate a new server */
993
mc.server = avahi_server_new(avahi_simple_poll_get
994
(mc.simple_poll), &config, NULL,
995
NULL, &error);
996
997
/* Free the Avahi configuration data */
998
avahi_server_config_free(&config);
999
}
1000
1001
/* Check if creating the Avahi server object succeeded */
1002
if (mc.server == NULL) {
1003
fprintf(stderr, "Failed to create Avahi server: %s\n",
1004
avahi_strerror(error));
1005
exitcode = EXIT_FAILURE;
1006
goto end;
1007
}
1008
1009
/* Create the Avahi service browser */
1010
sb = avahi_s_service_browser_new(mc.server, if_index,
1011
AVAHI_PROTO_INET6,
1012
"_mandos._tcp", NULL, 0,
1013
browse_callback, &mc);
1014
if (sb == NULL) {
1015
fprintf(stderr, "Failed to create service browser: %s\n",
1016
avahi_strerror(avahi_server_errno(mc.server)));
1017
exitcode = EXIT_FAILURE;
1018
goto end;
1019
}
1020
1021
/* Run the main loop */
1022
1023
if (debug){
1024
fprintf(stderr, "Starting Avahi loop search\n");
1025
}
1026
1027
avahi_simple_poll_loop(mc.simple_poll);
1028
1029
end:
1030
1031
if (debug){
1032
fprintf(stderr, "%s exiting\n", argv[0]);
1033
}
1034
1035
/* Cleanup things */
1036
if (sb != NULL)
1037
avahi_s_service_browser_free(sb);
1038
1039
if (mc.server != NULL)
1040
avahi_server_free(mc.server);
1041
1042
if (mc.simple_poll != NULL)
1043
avahi_simple_poll_free(mc.simple_poll);
1044
free(pubkeyfile);
1045
free(seckeyfile);
1046
1047
if (gnutls_initalized){
1048
gnutls_certificate_free_credentials(mc.cred);
1049
gnutls_global_deinit ();
1050
}
1051
1052
return exitcode;
2129
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2130
}
2131
}
2132
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2133
if(ret == -1){
2134
perror_plus("close");
2135
}
2136
/* Lower privileges permanently */
2137
errno = 0;
2138
ret = setuid(uid);
2139
if(ret == -1){
2140
perror_plus("setuid");
2141
}
2142
}
2143
}
2144
2145
/* Removes the GPGME temp directory and all files inside */
2146
if(tempdir_created){
2147
struct dirent **direntries = NULL;
2148
struct dirent *direntry = NULL;
2149
int numentries = scandir(tempdir, &direntries, notdotentries,
2150
alphasort);
2151
if (numentries > 0){
2152
for(int i = 0; i < numentries; i++){
2153
direntry = direntries[i];
2154
char *fullname = NULL;
2155
ret = asprintf(&fullname, "%s/%s", tempdir,
2156
direntry->d_name);
2157
if(ret < 0){
2158
perror_plus("asprintf");
2159
continue;
2160
}
2161
ret = remove(fullname);
2162
if(ret == -1){
2163
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2164
strerror(errno));
2165
}
2166
free(fullname);
2167
}
2168
}
2169
2170
/* need to clean even if 0 because man page doesn't specify */
2171
free(direntries);
2172
if (numentries == -1){
2173
perror_plus("scandir");
2174
}
2175
ret = rmdir(tempdir);
2176
if(ret == -1 and errno != ENOENT){
2177
perror_plus("rmdir");
2178
}
2179
}
2180
2181
if(quit_now){
2182
sigemptyset(&old_sigterm_action.sa_mask);
2183
old_sigterm_action.sa_handler = SIG_DFL;
2184
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2185
&old_sigterm_action,
2186
NULL));
2187
if(ret == -1){
2188
perror_plus("sigaction");
2189
}
2190
do {
2191
ret = raise(signal_received);
2192
} while(ret != 0 and errno == EINTR);
2193
if(ret != 0){
2194
perror_plus("raise");
2195
abort();
2196
}
2197
TEMP_FAILURE_RETRY(pause());
2198
}
2199
2200
return exitcode;
1053
2201
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0