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- Committer: Teddy Hogeborn
- Date: 2008-08-04 16:05:01 UTC
- mfrom: (24.1.15 mandos)
- Revision ID: teddy@fukt.bsnet.se-20080804160501-woej7nf8amgrbc2e
* plugins.d/mandosclient.c (start_mandos_communication): Change "to"
to be a union. All users changed.
to be a union. All users changed.
- files added:
- ca.pem
- files removed:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- files renamed:
- plugin-runner.c => plugbasedclient.c
- plugins.d/mandos-client.c => plugins.d/mandosclient.c
- plugins.d/password-prompt.c => plugins.d/passprompt.c
- mandos.conf => server.conf
- mandos => server.py
- files modified:
- Makefile
added
removed
plugins.d/mandosclient.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
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";
79
const char *argp_program_version = "mandosclient 0.9";
80
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
128
81
static const char mandos_protocol_version[] = "1";
129
const char *argp_program_version = "mandos-client " VERSION;
130
const char *argp_program_bug_address = "<mandos@fukt.bsnet.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;
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
/*
174
* Make additional room in "buffer" for at least BUFFER_SIZE more
175
* bytes. "buffer_capacity" is how much is currently allocated,
176
* "buffer_length" is how much is already used.
177
*/
178
size_t incbuffer(char **buffer, size_t buffer_length,
93
/* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
94
* "buffer_capacity" is how much is currently allocated,
95
* "buffer_length" is how much is already used. */
96
size_t adjustbuffer(char **buffer, size_t buffer_length,
179
97
size_t buffer_capacity){
180
if(buffer_length + BUFFER_SIZE > buffer_capacity){
98
if (buffer_length + BUFFER_SIZE > buffer_capacity){
181
99
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
182
if(buffer == NULL){
100
if (buffer == NULL){
183
101
return 0;
184
102
}
185
103
buffer_capacity += BUFFER_SIZE;
187
105
return buffer_capacity;
188
106
}
189
107
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
108
/*
229
* Initialize GPGME.
109
* Decrypt OpenPGP data using keyrings in HOMEDIR.
110
* Returns -1 on error
230
111
*/
231
static bool init_gpgme(const char *seckey,
232
const char *pubkey, const char *tempdir){
112
static ssize_t pgp_packet_decrypt (const char *cryptotext,
113
size_t crypto_size,
114
char **plaintext,
115
const char *homedir){
116
gpgme_data_t dh_crypto, dh_plain;
117
gpgme_ctx_t ctx;
233
118
gpgme_error_t rc;
119
ssize_t ret;
120
size_t plaintext_capacity = 0;
121
ssize_t plaintext_length = 0;
234
122
gpgme_engine_info_t engine_info;
235
123
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");
124
if (debug){
125
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
275
126
}
276
127
277
128
/* Init GPGME */
278
129
gpgme_check_version(NULL);
279
130
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
280
if(rc != GPG_ERR_NO_ERROR){
131
if (rc != GPG_ERR_NO_ERROR){
281
132
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
282
133
gpgme_strsource(rc), gpgme_strerror(rc));
283
return false;
134
return -1;
284
135
}
285
136
286
137
/* Set GPGME home directory for the OpenPGP engine only */
287
rc = gpgme_get_engine_info(&engine_info);
288
if(rc != GPG_ERR_NO_ERROR){
138
rc = gpgme_get_engine_info (&engine_info);
139
if (rc != GPG_ERR_NO_ERROR){
289
140
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
290
141
gpgme_strsource(rc), gpgme_strerror(rc));
291
return false;
142
return -1;
292
143
}
293
144
while(engine_info != NULL){
294
145
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
295
146
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
296
engine_info->file_name, tempdir);
147
engine_info->file_name, homedir);
297
148
break;
298
149
}
299
150
engine_info = engine_info->next;
300
151
}
301
152
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");
153
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
154
return -1;
336
155
}
337
156
338
157
/* Create new GPGME data buffer from memory cryptotext */
339
158
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
340
159
0);
341
if(rc != GPG_ERR_NO_ERROR){
160
if (rc != GPG_ERR_NO_ERROR){
342
161
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
343
162
gpgme_strsource(rc), gpgme_strerror(rc));
344
163
return -1;
346
165
347
166
/* Create new empty GPGME data buffer for the plaintext */
348
167
rc = gpgme_data_new(&dh_plain);
349
if(rc != GPG_ERR_NO_ERROR){
168
if (rc != GPG_ERR_NO_ERROR){
350
169
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
351
170
gpgme_strsource(rc), gpgme_strerror(rc));
352
171
gpgme_data_release(dh_crypto);
353
172
return -1;
354
173
}
355
174
175
/* Create new GPGME "context" */
176
rc = gpgme_new(&ctx);
177
if (rc != GPG_ERR_NO_ERROR){
178
fprintf(stderr, "bad gpgme_new: %s: %s\n",
179
gpgme_strsource(rc), gpgme_strerror(rc));
180
plaintext_length = -1;
181
goto decrypt_end;
182
}
183
356
184
/* Decrypt data from the cryptotext data buffer to the plaintext
357
185
data buffer */
358
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
359
if(rc != GPG_ERR_NO_ERROR){
186
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
187
if (rc != GPG_ERR_NO_ERROR){
360
188
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
361
189
gpgme_strsource(rc), gpgme_strerror(rc));
362
190
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;
191
goto decrypt_end;
192
}
193
194
if(debug){
195
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
196
}
197
198
if (debug){
199
gpgme_decrypt_result_t result;
200
result = gpgme_op_decrypt_result(ctx);
201
if (result == NULL){
202
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
203
} else {
204
fprintf(stderr, "Unsupported algorithm: %s\n",
205
result->unsupported_algorithm);
206
fprintf(stderr, "Wrong key usage: %d\n",
207
result->wrong_key_usage);
208
if(result->file_name != NULL){
209
fprintf(stderr, "File name: %s\n", result->file_name);
210
}
211
gpgme_recipient_t recipient;
212
recipient = result->recipients;
213
if(recipient){
378
214
while(recipient != NULL){
379
215
fprintf(stderr, "Public key algorithm: %s\n",
380
216
gpgme_pubkey_algo_name(recipient->pubkey_algo));
386
222
}
387
223
}
388
224
}
389
goto decrypt_end;
390
}
391
392
if(debug){
393
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
394
225
}
395
226
396
227
/* 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");
228
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
229
perror("pgpme_data_seek");
399
230
plaintext_length = -1;
400
231
goto decrypt_end;
401
232
}
402
233
403
234
*plaintext = NULL;
404
235
while(true){
405
plaintext_capacity = incbuffer(plaintext,
236
plaintext_capacity = adjustbuffer(plaintext,
406
237
(size_t)plaintext_length,
407
238
plaintext_capacity);
408
if(plaintext_capacity == 0){
409
perror_plus("incbuffer");
239
if (plaintext_capacity == 0){
240
perror("adjustbuffer");
410
241
plaintext_length = -1;
411
242
goto decrypt_end;
412
243
}
414
245
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
415
246
BUFFER_SIZE);
416
247
/* Print the data, if any */
417
if(ret == 0){
248
if (ret == 0){
418
249
/* EOF */
419
250
break;
420
251
}
421
252
if(ret < 0){
422
perror_plus("gpgme_data_read");
253
perror("gpgme_data_read");
423
254
plaintext_length = -1;
424
255
goto decrypt_end;
425
256
}
426
257
plaintext_length += ret;
427
258
}
428
259
429
260
if(debug){
430
261
fprintf(stderr, "Decrypted password is: ");
431
262
for(ssize_t i = 0; i < plaintext_length; i++){
444
275
return plaintext_length;
445
276
}
446
277
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)
278
static const char * safer_gnutls_strerror (int value) {
279
const char *ret = gnutls_strerror (value);
280
if (ret == NULL)
451
281
ret = "(unknown)";
452
282
return ret;
453
283
}
458
288
fprintf(stderr, "GnuTLS: %s", string);
459
289
}
460
290
461
static int init_gnutls_global(const char *pubkeyfilename,
462
const char *seckeyfilename){
291
static int init_gnutls_global(mandos_context *mc,
292
const char *pubkeyfile,
293
const char *seckeyfile){
463
294
int ret;
464
295
465
296
if(debug){
466
297
fprintf(stderr, "Initializing GnuTLS\n");
467
298
}
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));
299
300
if ((ret = gnutls_global_init ())
301
!= GNUTLS_E_SUCCESS) {
302
fprintf (stderr, "GnuTLS global_init: %s\n",
303
safer_gnutls_strerror(ret));
473
304
return -1;
474
305
}
475
306
476
if(debug){
307
if (debug){
477
308
/* "Use a log level over 10 to enable all debugging options."
478
309
* - GnuTLS manual
479
310
*/
482
313
}
483
314
484
315
/* 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();
316
if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))
317
!= GNUTLS_E_SUCCESS) {
318
fprintf (stderr, "GnuTLS memory error: %s\n",
319
safer_gnutls_strerror(ret));
490
320
return -1;
491
321
}
492
322
493
323
if(debug){
494
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
495
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
496
seckeyfilename);
324
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
325
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
326
seckeyfile);
497
327
}
498
328
499
329
ret = gnutls_certificate_set_openpgp_key_file
500
(mc.cred, pubkeyfilename, seckeyfilename,
501
GNUTLS_OPENPGP_FMT_BASE64);
502
if(ret != GNUTLS_E_SUCCESS){
330
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
331
if (ret != GNUTLS_E_SUCCESS) {
503
332
fprintf(stderr,
504
333
"Error[%d] while reading the OpenPGP key pair ('%s',"
505
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
506
fprintf(stderr, "The GnuTLS error is: %s\n",
334
" '%s')\n", ret, pubkeyfile, seckeyfile);
335
fprintf(stdout, "The GnuTLS error is: %s\n",
507
336
safer_gnutls_strerror(ret));
508
goto globalfail;
337
return -1;
509
338
}
510
339
511
340
/* 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
341
ret = gnutls_dh_params_init(&mc->dh_params);
342
if (ret != GNUTLS_E_SUCCESS) {
343
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
344
" %s\n", safer_gnutls_strerror(ret));
345
return -1;
346
}
347
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
348
if (ret != GNUTLS_E_SUCCESS) {
349
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
350
safer_gnutls_strerror(ret));
351
return -1;
352
}
353
354
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
355
527
356
return 0;
528
529
globalfail:
530
531
gnutls_certificate_free_credentials(mc.cred);
532
gnutls_global_deinit();
533
gnutls_dh_params_deinit(mc.dh_params);
534
return -1;
535
357
}
536
358
537
static int init_gnutls_session(gnutls_session_t *session){
359
static int init_gnutls_session(mandos_context *mc,
360
gnutls_session_t *session){
538
361
int ret;
539
362
/* 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){
363
ret = gnutls_init(session, GNUTLS_SERVER);
364
if (ret != GNUTLS_E_SUCCESS){
547
365
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
548
366
safer_gnutls_strerror(ret));
549
367
}
550
368
551
369
{
552
370
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){
371
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
372
if (ret != GNUTLS_E_SUCCESS) {
561
373
fprintf(stderr, "Syntax error at: %s\n", err);
562
374
fprintf(stderr, "GnuTLS error: %s\n",
563
375
safer_gnutls_strerror(ret));
564
gnutls_deinit(*session);
565
376
return -1;
566
377
}
567
378
}
568
379
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){
380
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
381
mc->cred);
382
if (ret != GNUTLS_E_SUCCESS) {
578
383
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
579
384
safer_gnutls_strerror(ret));
580
gnutls_deinit(*session);
581
385
return -1;
582
386
}
583
387
584
388
/* ignore client certificate if any. */
585
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
389
gnutls_certificate_server_set_request (*session,
390
GNUTLS_CERT_IGNORE);
586
391
587
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
392
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
588
393
589
394
return 0;
590
395
}
596
401
/* Called when a Mandos server is found */
597
402
static int start_mandos_communication(const char *ip, uint16_t port,
598
403
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;
404
mandos_context *mc){
405
int ret, tcp_sd;
406
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
606
407
char *buffer = NULL;
607
char *decrypted_buffer = NULL;
408
char *decrypted_buffer;
608
409
size_t buffer_length = 0;
609
410
size_t buffer_capacity = 0;
411
ssize_t decrypted_buffer_size;
610
412
size_t written;
611
int retval = -1;
413
int retval = 0;
414
char interface[IF_NAMESIZE];
612
415
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;
416
417
ret = init_gnutls_session (mc, &session);
418
if (ret != 0){
419
return -1;
420
}
421
422
if(debug){
423
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
424
ip, port);
425
}
426
427
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
428
if(tcp_sd < 0) {
429
perror("socket");
430
return -1;
431
}
432
433
if(debug){
434
if(if_indextoname((unsigned int)if_index, interface) == NULL){
435
perror("if_indextoname");
436
return -1;
437
}
438
fprintf(stderr, "Binding to interface %s\n", interface);
439
}
440
441
memset(&to,0,sizeof(to)); /* Spurious warning */
442
to.in6.sin6_family = AF_INET6;
443
/* It would be nice to have a way to detect if we were passed an
444
IPv4 address here. Now we assume an IPv6 address. */
445
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
446
if (ret < 0 ){
447
perror("inet_pton");
448
return -1;
671
449
}
672
450
if(ret == 0){
673
int e = errno;
674
451
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
}
452
return -1;
453
}
454
to.in6.sin6_port = htons(port); /* Spurious warning */
700
455
701
if(quit_now){
702
errno = EINTR;
703
goto mandos_end;
704
}
456
to.in6.sin6_scope_id = (uint32_t)if_index;
705
457
706
458
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");
459
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
460
char addrstr[INET6_ADDRSTRLEN] = "";
461
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
462
sizeof(addrstr)) == NULL){
463
perror("inet_ntop");
731
464
} else {
732
465
if(strcmp(addrstr, ip) != 0){
733
466
fprintf(stderr, "Canonical address form: %s\n", addrstr);
735
468
}
736
469
}
737
470
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
471
ret = connect(tcp_sd, &to.in, sizeof(to));
472
if (ret < 0){
473
perror("connect");
474
return -1;
475
}
476
762
477
const char *out = mandos_protocol_version;
763
478
written = 0;
764
while(true){
479
while (true){
765
480
size_t out_size = strlen(out);
766
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
481
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
767
482
out_size - written));
768
if(ret == -1){
769
int e = errno;
770
perror_plus("write");
771
errno = e;
483
if (ret == -1){
484
perror("write");
485
retval = -1;
772
486
goto mandos_end;
773
487
}
774
488
written += (size_t)ret;
775
489
if(written < out_size){
776
490
continue;
777
491
} else {
778
if(out == mandos_protocol_version){
492
if (out == mandos_protocol_version){
779
493
written = 0;
780
494
out = "\r\n";
781
495
} else {
782
496
break;
783
497
}
784
498
}
785
786
if(quit_now){
787
errno = EINTR;
788
goto mandos_end;
789
}
790
499
}
791
500
792
501
if(debug){
793
502
fprintf(stderr, "Establishing TLS session with %s\n", ip);
794
503
}
795
504
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){
505
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
506
507
ret = gnutls_handshake (session);
508
509
if (ret != GNUTLS_E_SUCCESS){
818
510
if(debug){
819
511
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
820
gnutls_perror(ret);
512
gnutls_perror (ret);
821
513
}
822
errno = EPROTO;
514
retval = -1;
823
515
goto mandos_end;
824
516
}
825
517
826
518
/* Read OpenPGP packet that contains the wanted password */
827
519
828
520
if(debug){
829
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
521
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
830
522
ip);
831
523
}
832
524
833
525
while(true){
834
835
if(quit_now){
836
errno = EINTR;
837
goto mandos_end;
838
}
839
840
buffer_capacity = incbuffer(&buffer, buffer_length,
526
buffer_capacity = adjustbuffer(&buffer, buffer_length,
841
527
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){
528
if (buffer_capacity == 0){
529
perror("adjustbuffer");
530
retval = -1;
531
goto mandos_end;
532
}
533
534
ret = gnutls_record_recv(session, buffer+buffer_length,
535
BUFFER_SIZE);
536
if (ret == 0){
857
537
break;
858
538
}
859
if(sret < 0){
860
switch(sret){
539
if (ret < 0){
540
switch(ret){
861
541
case GNUTLS_E_INTERRUPTED:
862
542
case GNUTLS_E_AGAIN:
863
543
break;
864
544
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){
545
ret = gnutls_handshake (session);
546
if (ret < 0){
874
547
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
875
gnutls_perror(ret);
876
errno = EPROTO;
548
gnutls_perror (ret);
549
retval = -1;
877
550
goto mandos_end;
878
551
}
879
552
break;
880
553
default:
881
554
fprintf(stderr, "Unknown error while reading data from"
882
555
" encrypted session with Mandos server\n");
883
gnutls_bye(session, GNUTLS_SHUT_RDWR);
884
errno = EIO;
556
retval = -1;
557
gnutls_bye (session, GNUTLS_SHUT_RDWR);
885
558
goto mandos_end;
886
559
}
887
560
} else {
888
buffer_length += (size_t) sret;
561
buffer_length += (size_t) ret;
889
562
}
890
563
}
891
564
893
566
fprintf(stderr, "Closing TLS session\n");
894
567
}
895
568
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;
569
gnutls_bye (session, GNUTLS_SHUT_RDWR);
570
571
if (buffer_length > 0){
911
572
decrypted_buffer_size = pgp_packet_decrypt(buffer,
912
573
buffer_length,
913
&decrypted_buffer);
914
if(decrypted_buffer_size >= 0){
915
574
&decrypted_buffer,
575
keydir);
576
if (decrypted_buffer_size >= 0){
916
577
written = 0;
917
578
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);
579
ret = (int)fwrite (decrypted_buffer + written, 1,
580
(size_t)decrypted_buffer_size - written,
581
stdout);
926
582
if(ret == 0 and ferror(stdout)){
927
int e = errno;
928
583
if(debug){
929
584
fprintf(stderr, "Error writing encrypted data: %s\n",
930
585
strerror(errno));
931
586
}
932
errno = e;
933
goto mandos_end;
587
retval = -1;
588
break;
934
589
}
935
590
written += (size_t)ret;
936
591
}
937
retval = 0;
592
free(decrypted_buffer);
593
} else {
594
retval = -1;
938
595
}
939
596
}
940
597
941
598
/* Shutdown procedure */
942
599
943
600
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
}
601
free(buffer);
602
close(tcp_sd);
603
gnutls_deinit (session);
604
gnutls_certificate_free_credentials (mc->cred);
605
gnutls_global_deinit ();
964
606
return retval;
965
607
}
966
608
967
609
static void resolve_callback(AvahiSServiceResolver *r,
968
610
AvahiIfIndex interface,
969
AvahiProtocol proto,
611
AVAHI_GCC_UNUSED AvahiProtocol protocol,
970
612
AvahiResolverEvent event,
971
613
const char *name,
972
614
const char *type,
977
619
AVAHI_GCC_UNUSED AvahiStringList *txt,
978
620
AVAHI_GCC_UNUSED AvahiLookupResultFlags
979
621
flags,
980
AVAHI_GCC_UNUSED void* userdata){
981
assert(r);
622
void* userdata) {
623
mandos_context *mc = userdata;
624
assert(r); /* Spurious warning */
982
625
983
626
/* Called whenever a service has been resolved successfully or
984
627
timed out */
985
628
986
if(quit_now){
987
return;
988
}
989
990
switch(event){
629
switch (event) {
991
630
default:
992
631
case AVAHI_RESOLVER_FAILURE:
993
632
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
994
633
" of type '%s' in domain '%s': %s\n", name, type, domain,
995
avahi_strerror(avahi_server_errno(mc.server)));
634
avahi_strerror(avahi_server_errno(mc->server)));
996
635
break;
997
636
998
637
case AVAHI_RESOLVER_FOUND:
1000
639
char ip[AVAHI_ADDRESS_STR_MAX];
1001
640
avahi_address_snprint(ip, sizeof(ip), address);
1002
641
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);
642
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %d) on"
643
" port %d\n", name, host_name, ip, interface, port);
1006
644
}
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));
645
int ret = start_mandos_communication(ip, port, interface, mc);
646
if (ret == 0){
647
exit(EXIT_SUCCESS);
1014
648
}
1015
649
}
1016
650
}
1017
651
avahi_s_service_resolver_free(r);
1018
652
}
1019
653
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);
654
static void browse_callback( AvahiSServiceBrowser *b,
655
AvahiIfIndex interface,
656
AvahiProtocol protocol,
657
AvahiBrowserEvent event,
658
const char *name,
659
const char *type,
660
const char *domain,
661
AVAHI_GCC_UNUSED AvahiLookupResultFlags
662
flags,
663
void* userdata) {
664
mandos_context *mc = userdata;
665
assert(b); /* Spurious warning */
1031
666
1032
667
/* Called whenever a new services becomes available on the LAN or
1033
668
is removed from the LAN */
1034
669
1035
if(quit_now){
1036
return;
1037
}
1038
1039
switch(event){
670
switch (event) {
1040
671
default:
1041
672
case AVAHI_BROWSER_FAILURE:
1042
673
1043
674
fprintf(stderr, "(Avahi browser) %s\n",
1044
avahi_strerror(avahi_server_errno(mc.server)));
1045
avahi_simple_poll_quit(mc.simple_poll);
675
avahi_strerror(avahi_server_errno(mc->server)));
676
avahi_simple_poll_quit(mc->simple_poll);
1046
677
return;
1047
678
1048
679
case AVAHI_BROWSER_NEW:
1051
682
the callback function is called the Avahi server will free the
1052
683
resolver for us. */
1053
684
1054
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1055
name, type, domain, protocol, 0,
1056
resolve_callback, NULL) == NULL)
685
if (!(avahi_s_service_resolver_new(mc->server, interface,
686
protocol, name, type, domain,
687
AVAHI_PROTO_INET6, 0,
688
resolve_callback, mc)))
1057
689
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1058
name, avahi_strerror(avahi_server_errno(mc.server)));
690
name, avahi_strerror(avahi_server_errno(mc->server)));
1059
691
break;
1060
692
1061
693
case AVAHI_BROWSER_REMOVE:
1070
702
}
1071
703
}
1072
704
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
/*
1089
* This function determines if a directory entry in /sys/class/net
1090
* corresponds to an acceptable network device.
1091
* (This function is passed to scandir(3) as a filter function.)
1092
*/
1093
int good_interface(const struct dirent *if_entry){
1094
ssize_t ssret;
1095
char *flagname = NULL;
1096
if(if_entry->d_name[0] == '.'){
1097
return 0;
1098
}
1099
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1100
if_entry->d_name);
1101
if(ret < 0){
1102
perror_plus("asprintf");
1103
return 0;
1104
}
1105
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1106
if(flags_fd == -1){
1107
perror_plus("open");
1108
free(flagname);
1109
return 0;
1110
}
1111
free(flagname);
1112
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1113
/* read line from flags_fd */
1114
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1115
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1116
flagstring[(size_t)to_read] = '\0';
1117
if(flagstring == NULL){
1118
perror_plus("malloc");
1119
close(flags_fd);
1120
return 0;
1121
}
1122
while(to_read > 0){
1123
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1124
(size_t)to_read));
1125
if(ssret == -1){
1126
perror_plus("read");
1127
free(flagstring);
1128
close(flags_fd);
1129
return 0;
1130
}
1131
to_read -= ssret;
1132
if(ssret == 0){
1133
break;
1134
}
1135
}
1136
close(flags_fd);
1137
intmax_t tmpmax;
1138
char *tmp;
1139
errno = 0;
1140
tmpmax = strtoimax(flagstring, &tmp, 0);
1141
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1142
and not (isspace(*tmp)))
1143
or tmpmax != (ifreq_flags)tmpmax){
1144
if(debug){
1145
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1146
flagstring, if_entry->d_name);
1147
}
1148
free(flagstring);
1149
return 0;
1150
}
1151
free(flagstring);
1152
ifreq_flags flags = (ifreq_flags)tmpmax;
1153
/* Reject the loopback device */
1154
if(flags & IFF_LOOPBACK){
1155
if(debug){
1156
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1157
if_entry->d_name);
1158
}
1159
return 0;
1160
}
1161
/* Accept point-to-point devices only if connect_to is specified */
1162
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1163
if(debug){
1164
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1165
if_entry->d_name);
1166
}
1167
return 1;
1168
}
1169
/* Otherwise, reject non-broadcast-capable devices */
1170
if(not (flags & IFF_BROADCAST)){
1171
if(debug){
1172
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1173
if_entry->d_name);
1174
}
1175
return 0;
1176
}
1177
/* Reject non-ARP interfaces (including dummy interfaces) */
1178
if(flags & IFF_NOARP){
1179
if(debug){
1180
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1181
if_entry->d_name);
1182
}
1183
return 0;
1184
}
1185
/* Accept this device */
1186
if(debug){
1187
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1188
if_entry->d_name);
1189
}
1190
return 1;
1191
}
1192
1193
int notdotentries(const struct dirent *direntry){
1194
/* Skip "." and ".." */
1195
if(direntry->d_name[0] == '.'
1196
and (direntry->d_name[1] == '\0'
1197
or (direntry->d_name[1] == '.'
1198
and direntry->d_name[2] == '\0'))){
1199
return 0;
1200
}
1201
return 1;
1202
}
1203
1204
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1205
int ret;
1206
struct timespec now;
1207
struct timespec waited_time;
1208
intmax_t block_time;
1209
1210
while(true){
1211
if(mc.current_server == NULL){
1212
if (debug){
1213
fprintf(stderr,
1214
"Wait until first server is found. No timeout!\n");
1215
}
1216
ret = avahi_simple_poll_iterate(s, -1);
1217
} else {
1218
if (debug){
1219
fprintf(stderr, "Check current_server if we should run it,"
1220
" or wait\n");
1221
}
1222
/* the current time */
1223
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1224
if(ret == -1){
1225
perror_plus("clock_gettime");
1226
return -1;
1227
}
1228
/* Calculating in ms how long time between now and server
1229
who we visted longest time ago. Now - last seen. */
1230
waited_time.tv_sec = (now.tv_sec
1231
- mc.current_server->last_seen.tv_sec);
1232
waited_time.tv_nsec = (now.tv_nsec
1233
- mc.current_server->last_seen.tv_nsec);
1234
/* total time is 10s/10,000ms.
1235
Converting to s from ms by dividing by 1,000,
1236
and ns to ms by dividing by 1,000,000. */
1237
block_time = ((retry_interval
1238
- ((intmax_t)waited_time.tv_sec * 1000))
1239
- ((intmax_t)waited_time.tv_nsec / 1000000));
1240
1241
if (debug){
1242
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1243
}
1244
1245
if(block_time <= 0){
1246
ret = start_mandos_communication(mc.current_server->ip,
1247
mc.current_server->port,
1248
mc.current_server->if_index,
1249
mc.current_server->af);
1250
if(ret == 0){
1251
avahi_simple_poll_quit(mc.simple_poll);
1252
return 0;
1253
}
1254
ret = clock_gettime(CLOCK_MONOTONIC,
1255
&mc.current_server->last_seen);
1256
if(ret == -1){
1257
perror_plus("clock_gettime");
1258
return -1;
1259
}
1260
mc.current_server = mc.current_server->next;
1261
block_time = 0; /* Call avahi to find new Mandos
1262
servers, but don't block */
1263
}
1264
1265
ret = avahi_simple_poll_iterate(s, (int)block_time);
1266
}
1267
if(ret != 0){
1268
if (ret > 0 or errno != EINTR) {
1269
return (ret != 1) ? ret : 0;
1270
}
1271
}
1272
}
1273
}
705
/* Combines file name and path and returns the malloced new
706
string. some sane checks could/should be added */
707
static const char *combinepath(const char *first, const char *second){
708
size_t f_len = strlen(first);
709
size_t s_len = strlen(second);
710
char *tmp = malloc(f_len + s_len + 2);
711
if (tmp == NULL){
712
return NULL;
713
}
714
if(f_len > 0){
715
memcpy(tmp, first, f_len); /* Spurious warning */
716
}
717
tmp[f_len] = '/';
718
if(s_len > 0){
719
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
720
}
721
tmp[f_len + 1 + s_len] = '\0';
722
return tmp;
723
}
724
1274
725
1275
726
int main(int argc, char *argv[]){
1276
AvahiSServiceBrowser *sb = NULL;
1277
int error;
1278
int ret;
1279
intmax_t tmpmax;
1280
char *tmp;
1281
int exitcode = EXIT_SUCCESS;
1282
const char *interface = "";
1283
struct ifreq network;
1284
int sd = -1;
1285
bool take_down_interface = false;
1286
uid_t uid;
1287
gid_t gid;
1288
char tempdir[] = "/tmp/mandosXXXXXX";
1289
bool tempdir_created = false;
1290
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1291
const char *seckey = PATHDIR "/" SECKEY;
1292
const char *pubkey = PATHDIR "/" PUBKEY;
1293
1294
bool gnutls_initialized = false;
1295
bool gpgme_initialized = false;
1296
float delay = 2.5f;
1297
double retry_interval = 10; /* 10s between trying a server and
1298
retrying the same server again */
1299
1300
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1301
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1302
1303
uid = getuid();
1304
gid = getgid();
1305
1306
/* Lower any group privileges we might have, just to be safe */
1307
errno = 0;
1308
ret = setgid(gid);
1309
if(ret == -1){
1310
perror_plus("setgid");
1311
}
1312
1313
/* Lower user privileges (temporarily) */
1314
errno = 0;
1315
ret = seteuid(uid);
1316
if(ret == -1){
1317
perror_plus("seteuid");
1318
}
1319
1320
if(quit_now){
1321
goto end;
1322
}
1323
1324
{
1325
struct argp_option options[] = {
1326
{ .name = "debug", .key = 128,
1327
.doc = "Debug mode", .group = 3 },
1328
{ .name = "connect", .key = 'c',
1329
.arg = "ADDRESS:PORT",
1330
.doc = "Connect directly to a specific Mandos server",
1331
.group = 1 },
1332
{ .name = "interface", .key = 'i',
1333
.arg = "NAME",
1334
.doc = "Network interface that will be used to search for"
1335
" Mandos servers",
1336
.group = 1 },
1337
{ .name = "seckey", .key = 's',
1338
.arg = "FILE",
1339
.doc = "OpenPGP secret key file base name",
1340
.group = 1 },
1341
{ .name = "pubkey", .key = 'p',
1342
.arg = "FILE",
1343
.doc = "OpenPGP public key file base name",
1344
.group = 2 },
1345
{ .name = "dh-bits", .key = 129,
1346
.arg = "BITS",
1347
.doc = "Bit length of the prime number used in the"
1348
" Diffie-Hellman key exchange",
1349
.group = 2 },
1350
{ .name = "priority", .key = 130,
1351
.arg = "STRING",
1352
.doc = "GnuTLS priority string for the TLS handshake",
1353
.group = 1 },
1354
{ .name = "delay", .key = 131,
1355
.arg = "SECONDS",
1356
.doc = "Maximum delay to wait for interface startup",
1357
.group = 2 },
1358
{ .name = "retry", .key = 132,
1359
.arg = "SECONDS",
1360
.doc = "Retry interval used when denied by the mandos server",
1361
.group = 2 },
1362
/*
1363
* These reproduce what we would get without ARGP_NO_HELP
1364
*/
1365
{ .name = "help", .key = '?',
1366
.doc = "Give this help list", .group = -1 },
1367
{ .name = "usage", .key = -3,
1368
.doc = "Give a short usage message", .group = -1 },
1369
{ .name = "version", .key = 'V',
1370
.doc = "Print program version", .group = -1 },
1371
{ .name = NULL }
1372
};
1373
1374
error_t parse_opt(int key, char *arg,
1375
struct argp_state *state){
1376
errno = 0;
1377
switch(key){
1378
case 128: /* --debug */
1379
debug = true;
1380
break;
1381
case 'c': /* --connect */
1382
connect_to = arg;
1383
break;
1384
case 'i': /* --interface */
1385
interface = arg;
1386
break;
1387
case 's': /* --seckey */
1388
seckey = arg;
1389
break;
1390
case 'p': /* --pubkey */
1391
pubkey = arg;
1392
break;
1393
case 129: /* --dh-bits */
1394
errno = 0;
1395
tmpmax = strtoimax(arg, &tmp, 10);
1396
if(errno != 0 or tmp == arg or *tmp != '\0'
1397
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1398
argp_error(state, "Bad number of DH bits");
1399
}
1400
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1401
break;
1402
case 130: /* --priority */
1403
mc.priority = arg;
1404
break;
1405
case 131: /* --delay */
1406
errno = 0;
1407
delay = strtof(arg, &tmp);
1408
if(errno != 0 or tmp == arg or *tmp != '\0'){
1409
argp_error(state, "Bad delay");
1410
}
1411
case 132: /* --retry */
1412
errno = 0;
1413
retry_interval = strtod(arg, &tmp);
1414
if(errno != 0 or tmp == arg or *tmp != '\0'
1415
or (retry_interval * 1000) > INT_MAX
1416
or retry_interval < 0){
1417
argp_error(state, "Bad retry interval");
1418
}
1419
break;
1420
/*
1421
* These reproduce what we would get without ARGP_NO_HELP
1422
*/
1423
case '?': /* --help */
1424
argp_state_help(state, state->out_stream,
1425
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1426
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1427
case -3: /* --usage */
1428
argp_state_help(state, state->out_stream,
1429
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1430
case 'V': /* --version */
1431
fprintf(state->out_stream, "%s\n", argp_program_version);
1432
exit(argp_err_exit_status);
1433
break;
1434
default:
1435
return ARGP_ERR_UNKNOWN;
1436
}
1437
return errno;
1438
}
1439
1440
struct argp argp = { .options = options, .parser = parse_opt,
1441
.args_doc = "",
1442
.doc = "Mandos client -- Get and decrypt"
1443
" passwords from a Mandos server" };
1444
ret = argp_parse(&argp, argc, argv,
1445
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1446
switch(ret){
1447
case 0:
1448
break;
1449
case ENOMEM:
1450
default:
1451
errno = ret;
1452
perror_plus("argp_parse");
1453
exitcode = EX_OSERR;
1454
goto end;
1455
case EINVAL:
1456
exitcode = EX_USAGE;
1457
goto end;
1458
}
1459
}
1460
1461
{
1462
/* Work around Debian bug #633582:
1463
<http://bugs.debian.org/633582> */
1464
struct stat st;
1465
1466
/* Re-raise priviliges */
1467
errno = 0;
1468
ret = seteuid(0);
1469
if(ret == -1){
1470
perror_plus("seteuid");
1471
}
1472
1473
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1474
int seckey_fd = open(seckey, O_RDONLY);
1475
if(seckey_fd == -1){
1476
perror_plus("open");
1477
} else {
1478
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1479
if(ret == -1){
1480
perror_plus("fstat");
1481
} else {
1482
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1483
ret = fchown(seckey_fd, uid, gid);
1484
if(ret == -1){
1485
perror_plus("fchown");
1486
}
1487
}
1488
}
1489
TEMP_FAILURE_RETRY(close(seckey_fd));
1490
}
1491
}
1492
1493
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1494
int pubkey_fd = open(pubkey, O_RDONLY);
1495
if(pubkey_fd == -1){
1496
perror_plus("open");
1497
} else {
1498
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1499
if(ret == -1){
1500
perror_plus("fstat");
1501
} else {
1502
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1503
ret = fchown(pubkey_fd, uid, gid);
1504
if(ret == -1){
1505
perror_plus("fchown");
1506
}
1507
}
1508
}
1509
TEMP_FAILURE_RETRY(close(pubkey_fd));
1510
}
1511
}
1512
1513
/* Lower privileges */
1514
errno = 0;
1515
ret = seteuid(uid);
1516
if(ret == -1){
1517
perror_plus("seteuid");
1518
}
1519
}
1520
1521
if(not debug){
1522
avahi_set_log_function(empty_log);
1523
}
1524
1525
if(interface[0] == '\0'){
1526
struct dirent **direntries;
1527
ret = scandir(sys_class_net, &direntries, good_interface,
1528
alphasort);
1529
if(ret >= 1){
1530
/* Pick the first good interface */
1531
interface = strdup(direntries[0]->d_name);
1532
if(debug){
1533
fprintf(stderr, "Using interface \"%s\"\n", interface);
1534
}
1535
if(interface == NULL){
1536
perror_plus("malloc");
1537
free(direntries);
1538
exitcode = EXIT_FAILURE;
1539
goto end;
1540
}
1541
free(direntries);
1542
} else {
1543
free(direntries);
1544
fprintf(stderr, "Could not find a network interface\n");
727
AvahiSServiceBrowser *sb = NULL;
728
int error;
729
int ret;
730
int exitcode = EXIT_SUCCESS;
731
const char *interface = "eth0";
732
struct ifreq network;
733
int sd;
734
uid_t uid;
735
gid_t gid;
736
char *connect_to = NULL;
737
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
738
const char *pubkeyfile = "pubkey.txt";
739
const char *seckeyfile = "seckey.txt";
740
mandos_context mc = { .simple_poll = NULL, .server = NULL,
741
.dh_bits = 1024, .priority = "SECURE256"};
742
743
{
744
struct argp_option options[] = {
745
{ .name = "debug", .key = 128,
746
.doc = "Debug mode", .group = 3 },
747
{ .name = "connect", .key = 'c',
748
.arg = "IP",
749
.doc = "Connect directly to a sepcified mandos server",
750
.group = 1 },
751
{ .name = "interface", .key = 'i',
752
.arg = "INTERFACE",
753
.doc = "Interface that Avahi will conntect through",
754
.group = 1 },
755
{ .name = "keydir", .key = 'd',
756
.arg = "KEYDIR",
757
.doc = "Directory where the openpgp keyring is",
758
.group = 1 },
759
{ .name = "seckey", .key = 's',
760
.arg = "SECKEY",
761
.doc = "Secret openpgp key for gnutls authentication",
762
.group = 1 },
763
{ .name = "pubkey", .key = 'p',
764
.arg = "PUBKEY",
765
.doc = "Public openpgp key for gnutls authentication",
766
.group = 2 },
767
{ .name = "dh-bits", .key = 129,
768
.arg = "BITS",
769
.doc = "dh-bits to use in gnutls communication",
770
.group = 2 },
771
{ .name = "priority", .key = 130,
772
.arg = "PRIORITY",
773
.doc = "GNUTLS priority", .group = 1 },
774
{ .name = NULL }
775
};
776
777
778
error_t parse_opt (int key, char *arg,
779
struct argp_state *state) {
780
/* Get the INPUT argument from `argp_parse', which we know is
781
a pointer to our plugin list pointer. */
782
switch (key) {
783
case 128:
784
debug = true;
785
break;
786
case 'c':
787
connect_to = arg;
788
break;
789
case 'i':
790
interface = arg;
791
break;
792
case 'd':
793
keydir = arg;
794
break;
795
case 's':
796
seckeyfile = arg;
797
break;
798
case 'p':
799
pubkeyfile = arg;
800
break;
801
case 129:
802
errno = 0;
803
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
804
if (errno){
805
perror("strtol");
806
exit(EXIT_FAILURE);
807
}
808
break;
809
case 130:
810
mc.priority = arg;
811
break;
812
case ARGP_KEY_ARG:
813
argp_usage (state);
814
break;
815
case ARGP_KEY_END:
816
break;
817
default:
818
return ARGP_ERR_UNKNOWN;
819
}
820
return 0;
821
}
822
823
struct argp argp = { .options = options, .parser = parse_opt,
824
.args_doc = "",
825
.doc = "Mandos client -- Get and decrypt"
826
" passwords from mandos server" };
827
argp_parse (&argp, argc, argv, 0, 0, NULL);
828
}
829
830
pubkeyfile = combinepath(keydir, pubkeyfile);
831
if (pubkeyfile == NULL){
832
perror("combinepath");
1545
833
exitcode = EXIT_FAILURE;
1546
834
goto end;
1547
835
}
1548
}
1549
1550
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1551
from the signal handler */
1552
/* Initialize the pseudo-RNG for Avahi */
1553
srand((unsigned int) time(NULL));
1554
mc.simple_poll = avahi_simple_poll_new();
1555
if(mc.simple_poll == NULL){
1556
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1557
exitcode = EX_UNAVAILABLE;
1558
goto end;
1559
}
1560
1561
sigemptyset(&sigterm_action.sa_mask);
1562
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1563
if(ret == -1){
1564
perror_plus("sigaddset");
1565
exitcode = EX_OSERR;
1566
goto end;
1567
}
1568
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1569
if(ret == -1){
1570
perror_plus("sigaddset");
1571
exitcode = EX_OSERR;
1572
goto end;
1573
}
1574
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1575
if(ret == -1){
1576
perror_plus("sigaddset");
1577
exitcode = EX_OSERR;
1578
goto end;
1579
}
1580
/* Need to check if the handler is SIG_IGN before handling:
1581
| [[info:libc:Initial Signal Actions]] |
1582
| [[info:libc:Basic Signal Handling]] |
1583
*/
1584
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1585
if(ret == -1){
1586
perror_plus("sigaction");
1587
return EX_OSERR;
1588
}
1589
if(old_sigterm_action.sa_handler != SIG_IGN){
1590
ret = sigaction(SIGINT, &sigterm_action, NULL);
1591
if(ret == -1){
1592
perror_plus("sigaction");
1593
exitcode = EX_OSERR;
1594
goto end;
1595
}
1596
}
1597
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1598
if(ret == -1){
1599
perror_plus("sigaction");
1600
return EX_OSERR;
1601
}
1602
if(old_sigterm_action.sa_handler != SIG_IGN){
1603
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1604
if(ret == -1){
1605
perror_plus("sigaction");
1606
exitcode = EX_OSERR;
1607
goto end;
1608
}
1609
}
1610
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1611
if(ret == -1){
1612
perror_plus("sigaction");
1613
return EX_OSERR;
1614
}
1615
if(old_sigterm_action.sa_handler != SIG_IGN){
1616
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1617
if(ret == -1){
1618
perror_plus("sigaction");
1619
exitcode = EX_OSERR;
1620
goto end;
1621
}
1622
}
1623
1624
/* If the interface is down, bring it up */
1625
if(strcmp(interface, "none") != 0){
836
837
seckeyfile = combinepath(keydir, seckeyfile);
838
if (seckeyfile == NULL){
839
perror("combinepath");
840
goto end;
841
}
842
843
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
844
if (ret == -1){
845
fprintf(stderr, "init_gnutls_global\n");
846
goto end;
847
}
848
849
uid = getuid();
850
gid = getgid();
851
852
ret = setuid(uid);
853
if (ret == -1){
854
perror("setuid");
855
}
856
857
setgid(gid);
858
if (ret == -1){
859
perror("setgid");
860
}
861
1626
862
if_index = (AvahiIfIndex) if_nametoindex(interface);
1627
863
if(if_index == 0){
1628
864
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1629
exitcode = EX_UNAVAILABLE;
1630
goto end;
1631
}
1632
1633
if(quit_now){
1634
goto end;
1635
}
1636
1637
/* Re-raise priviliges */
1638
errno = 0;
1639
ret = seteuid(0);
1640
if(ret == -1){
1641
perror_plus("seteuid");
1642
}
1643
1644
#ifdef __linux__
1645
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1646
messages about the network interface to mess up the prompt */
1647
ret = klogctl(8, NULL, 5);
1648
bool restore_loglevel = true;
1649
if(ret == -1){
1650
restore_loglevel = false;
1651
perror_plus("klogctl");
1652
}
1653
#endif /* __linux__ */
1654
1655
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1656
if(sd < 0){
1657
perror_plus("socket");
1658
exitcode = EX_OSERR;
1659
#ifdef __linux__
1660
if(restore_loglevel){
1661
ret = klogctl(7, NULL, 0);
1662
if(ret == -1){
1663
perror_plus("klogctl");
1664
}
1665
}
1666
#endif /* __linux__ */
1667
/* Lower privileges */
1668
errno = 0;
1669
ret = seteuid(uid);
1670
if(ret == -1){
1671
perror_plus("seteuid");
1672
}
1673
goto end;
1674
}
1675
strcpy(network.ifr_name, interface);
1676
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1677
if(ret == -1){
1678
perror_plus("ioctl SIOCGIFFLAGS");
1679
#ifdef __linux__
1680
if(restore_loglevel){
1681
ret = klogctl(7, NULL, 0);
1682
if(ret == -1){
1683
perror_plus("klogctl");
1684
}
1685
}
1686
#endif /* __linux__ */
1687
exitcode = EX_OSERR;
1688
/* Lower privileges */
1689
errno = 0;
1690
ret = seteuid(uid);
1691
if(ret == -1){
1692
perror_plus("seteuid");
1693
}
1694
goto end;
1695
}
1696
if((network.ifr_flags & IFF_UP) == 0){
1697
network.ifr_flags |= IFF_UP;
1698
take_down_interface = true;
1699
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1700
if(ret == -1){
1701
take_down_interface = false;
1702
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1703
exitcode = EX_OSERR;
1704
#ifdef __linux__
1705
if(restore_loglevel){
1706
ret = klogctl(7, NULL, 0);
1707
if(ret == -1){
1708
perror_plus("klogctl");
1709
}
1710
}
1711
#endif /* __linux__ */
1712
/* Lower privileges */
1713
errno = 0;
1714
ret = seteuid(uid);
1715
if(ret == -1){
1716
perror_plus("seteuid");
1717
}
1718
goto end;
1719
}
1720
}
1721
/* Sleep checking until interface is running.
1722
Check every 0.25s, up to total time of delay */
1723
for(int i=0; i < delay * 4; i++){
865
exit(EXIT_FAILURE);
866
}
867
868
if(connect_to != NULL){
869
/* Connect directly, do not use Zeroconf */
870
/* (Mainly meant for debugging) */
871
char *address = strrchr(connect_to, ':');
872
if(address == NULL){
873
fprintf(stderr, "No colon in address\n");
874
exitcode = EXIT_FAILURE;
875
goto end;
876
}
877
errno = 0;
878
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
879
if(errno){
880
perror("Bad port number");
881
exitcode = EXIT_FAILURE;
882
goto end;
883
}
884
*address = '\0';
885
address = connect_to;
886
ret = start_mandos_communication(address, port, if_index, &mc);
887
if(ret < 0){
888
exitcode = EXIT_FAILURE;
889
} else {
890
exitcode = EXIT_SUCCESS;
891
}
892
goto end;
893
}
894
895
/* If the interface is down, bring it up */
896
{
897
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
898
if(sd < 0) {
899
perror("socket");
900
exitcode = EXIT_FAILURE;
901
goto end;
902
}
903
strcpy(network.ifr_name, interface); /* Spurious warning */
1724
904
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1725
905
if(ret == -1){
1726
perror_plus("ioctl SIOCGIFFLAGS");
1727
} else if(network.ifr_flags & IFF_RUNNING){
1728
break;
1729
}
1730
struct timespec sleeptime = { .tv_nsec = 250000000 };
1731
ret = nanosleep(&sleeptime, NULL);
1732
if(ret == -1 and errno != EINTR){
1733
perror_plus("nanosleep");
1734
}
1735
}
1736
if(not take_down_interface){
1737
/* We won't need the socket anymore */
1738
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1739
if(ret == -1){
1740
perror_plus("close");
1741
}
1742
}
1743
#ifdef __linux__
1744
if(restore_loglevel){
1745
/* Restores kernel loglevel to default */
1746
ret = klogctl(7, NULL, 0);
1747
if(ret == -1){
1748
perror_plus("klogctl");
1749
}
1750
}
1751
#endif /* __linux__ */
1752
/* Lower privileges */
1753
errno = 0;
1754
if(take_down_interface){
1755
/* Lower privileges */
1756
ret = seteuid(uid);
1757
if(ret == -1){
1758
perror_plus("seteuid");
1759
}
1760
} else {
1761
/* Lower privileges permanently */
1762
ret = setuid(uid);
1763
if(ret == -1){
1764
perror_plus("setuid");
1765
}
1766
}
1767
}
1768
1769
if(quit_now){
1770
goto end;
1771
}
1772
1773
ret = init_gnutls_global(pubkey, seckey);
1774
if(ret == -1){
1775
fprintf(stderr, "init_gnutls_global failed\n");
1776
exitcode = EX_UNAVAILABLE;
1777
goto end;
1778
} else {
1779
gnutls_initialized = true;
1780
}
1781
1782
if(quit_now){
1783
goto end;
1784
}
1785
1786
if(mkdtemp(tempdir) == NULL){
1787
perror_plus("mkdtemp");
1788
goto end;
1789
}
1790
tempdir_created = true;
1791
1792
if(quit_now){
1793
goto end;
1794
}
1795
1796
if(not init_gpgme(pubkey, seckey, tempdir)){
1797
fprintf(stderr, "init_gpgme failed\n");
1798
exitcode = EX_UNAVAILABLE;
1799
goto end;
1800
} else {
1801
gpgme_initialized = true;
1802
}
1803
1804
if(quit_now){
1805
goto end;
1806
}
1807
1808
if(connect_to != NULL){
1809
/* Connect directly, do not use Zeroconf */
1810
/* (Mainly meant for debugging) */
1811
char *address = strrchr(connect_to, ':');
1812
if(address == NULL){
1813
fprintf(stderr, "No colon in address\n");
1814
exitcode = EX_USAGE;
1815
goto end;
1816
}
1817
1818
if(quit_now){
1819
goto end;
1820
}
1821
1822
uint16_t port;
1823
errno = 0;
1824
tmpmax = strtoimax(address+1, &tmp, 10);
1825
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1826
or tmpmax != (uint16_t)tmpmax){
1827
fprintf(stderr, "Bad port number\n");
1828
exitcode = EX_USAGE;
1829
goto end;
1830
}
1831
1832
if(quit_now){
1833
goto end;
1834
}
1835
1836
port = (uint16_t)tmpmax;
1837
*address = '\0';
1838
/* Colon in address indicates IPv6 */
1839
int af;
1840
if(strchr(connect_to, ':') != NULL){
1841
af = AF_INET6;
1842
/* Accept [] around IPv6 address - see RFC 5952 */
1843
if(connect_to[0] == '[' and address[-1] == ']')
1844
{
1845
connect_to++;
1846
address[-1] = '\0';
906
perror("ioctl SIOCGIFFLAGS");
907
exitcode = EXIT_FAILURE;
908
goto end;
909
}
910
if((network.ifr_flags & IFF_UP) == 0){
911
network.ifr_flags |= IFF_UP;
912
ret = ioctl(sd, SIOCSIFFLAGS, &network);
913
if(ret == -1){
914
perror("ioctl SIOCSIFFLAGS");
915
exitcode = EXIT_FAILURE;
916
goto end;
1847
917
}
1848
} else {
1849
af = AF_INET;
1850
}
1851
address = connect_to;
1852
1853
if(quit_now){
1854
goto end;
1855
}
1856
1857
while(not quit_now){
1858
ret = start_mandos_communication(address, port, if_index, af);
1859
if(quit_now or ret == 0){
1860
break;
1861
}
1862
if(debug){
1863
fprintf(stderr, "Retrying in %d seconds\n",
1864
(int)retry_interval);
1865
}
1866
sleep((int)retry_interval);
1867
}
1868
1869
if (not quit_now){
1870
exitcode = EXIT_SUCCESS;
1871
}
1872
1873
goto end;
1874
}
1875
1876
if(quit_now){
1877
goto end;
1878
}
1879
1880
{
1881
AvahiServerConfig config;
1882
/* Do not publish any local Zeroconf records */
1883
avahi_server_config_init(&config);
1884
config.publish_hinfo = 0;
1885
config.publish_addresses = 0;
1886
config.publish_workstation = 0;
1887
config.publish_domain = 0;
1888
1889
/* Allocate a new server */
1890
mc.server = avahi_server_new(avahi_simple_poll_get
1891
(mc.simple_poll), &config, NULL,
1892
NULL, &error);
1893
1894
/* Free the Avahi configuration data */
1895
avahi_server_config_free(&config);
1896
}
1897
1898
/* Check if creating the Avahi server object succeeded */
1899
if(mc.server == NULL){
1900
fprintf(stderr, "Failed to create Avahi server: %s\n",
1901
avahi_strerror(error));
1902
exitcode = EX_UNAVAILABLE;
1903
goto end;
1904
}
1905
1906
if(quit_now){
1907
goto end;
1908
}
1909
1910
/* Create the Avahi service browser */
1911
sb = avahi_s_service_browser_new(mc.server, if_index,
1912
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1913
NULL, 0, browse_callback, NULL);
1914
if(sb == NULL){
1915
fprintf(stderr, "Failed to create service browser: %s\n",
1916
avahi_strerror(avahi_server_errno(mc.server)));
1917
exitcode = EX_UNAVAILABLE;
1918
goto end;
1919
}
1920
1921
if(quit_now){
1922
goto end;
1923
}
1924
1925
/* Run the main loop */
1926
1927
if(debug){
1928
fprintf(stderr, "Starting Avahi loop search\n");
1929
}
1930
1931
ret = avahi_loop_with_timeout(mc.simple_poll,
1932
(int)(retry_interval * 1000));
1933
if(debug){
1934
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1935
(ret == 0) ? "successfully" : "with error");
1936
}
1937
918
}
919
close(sd);
920
}
921
922
if (not debug){
923
avahi_set_log_function(empty_log);
924
}
925
926
/* Initialize the pseudo-RNG for Avahi */
927
srand((unsigned int) time(NULL));
928
929
/* Allocate main Avahi loop object */
930
mc.simple_poll = avahi_simple_poll_new();
931
if (mc.simple_poll == NULL) {
932
fprintf(stderr, "Avahi: Failed to create simple poll"
933
" object.\n");
934
exitcode = EXIT_FAILURE;
935
goto end;
936
}
937
938
{
939
AvahiServerConfig config;
940
/* Do not publish any local Zeroconf records */
941
avahi_server_config_init(&config);
942
config.publish_hinfo = 0;
943
config.publish_addresses = 0;
944
config.publish_workstation = 0;
945
config.publish_domain = 0;
946
947
/* Allocate a new server */
948
mc.server = avahi_server_new(avahi_simple_poll_get
949
(mc.simple_poll), &config, NULL,
950
NULL, &error);
951
952
/* Free the Avahi configuration data */
953
avahi_server_config_free(&config);
954
}
955
956
/* Check if creating the Avahi server object succeeded */
957
if (mc.server == NULL) {
958
fprintf(stderr, "Failed to create Avahi server: %s\n",
959
avahi_strerror(error));
960
exitcode = EXIT_FAILURE;
961
goto end;
962
}
963
964
/* Create the Avahi service browser */
965
sb = avahi_s_service_browser_new(mc.server, if_index,
966
AVAHI_PROTO_INET6,
967
"_mandos._tcp", NULL, 0,
968
browse_callback, &mc);
969
if (sb == NULL) {
970
fprintf(stderr, "Failed to create service browser: %s\n",
971
avahi_strerror(avahi_server_errno(mc.server)));
972
exitcode = EXIT_FAILURE;
973
goto end;
974
}
975
976
/* Run the main loop */
977
978
if (debug){
979
fprintf(stderr, "Starting Avahi loop search\n");
980
}
981
982
avahi_simple_poll_loop(mc.simple_poll);
983
1938
984
end:
1939
1940
if(debug){
1941
fprintf(stderr, "%s exiting\n", argv[0]);
1942
}
1943
1944
/* Cleanup things */
1945
if(sb != NULL)
1946
avahi_s_service_browser_free(sb);
1947
1948
if(mc.server != NULL)
1949
avahi_server_free(mc.server);
1950
1951
if(mc.simple_poll != NULL)
1952
avahi_simple_poll_free(mc.simple_poll);
1953
1954
if(gnutls_initialized){
1955
gnutls_certificate_free_credentials(mc.cred);
1956
gnutls_global_deinit();
1957
gnutls_dh_params_deinit(mc.dh_params);
1958
}
1959
1960
if(gpgme_initialized){
1961
gpgme_release(mc.ctx);
1962
}
1963
1964
/* Cleans up the circular linked list of Mandos servers the client
1965
has seen */
1966
if(mc.current_server != NULL){
1967
mc.current_server->prev->next = NULL;
1968
while(mc.current_server != NULL){
1969
server *next = mc.current_server->next;
1970
free(mc.current_server);
1971
mc.current_server = next;
1972
}
1973
}
1974
1975
/* Take down the network interface */
1976
if(take_down_interface){
1977
/* Re-raise priviliges */
1978
errno = 0;
1979
ret = seteuid(0);
1980
if(ret == -1){
1981
perror_plus("seteuid");
1982
}
1983
if(geteuid() == 0){
1984
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1985
if(ret == -1){
1986
perror_plus("ioctl SIOCGIFFLAGS");
1987
} else if(network.ifr_flags & IFF_UP) {
1988
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1989
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1990
if(ret == -1){
1991
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1992
}
1993
}
1994
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1995
if(ret == -1){
1996
perror_plus("close");
1997
}
1998
/* Lower privileges permanently */
1999
errno = 0;
2000
ret = setuid(uid);
2001
if(ret == -1){
2002
perror_plus("setuid");
2003
}
2004
}
2005
}
2006
2007
/* Removes the GPGME temp directory and all files inside */
2008
if(tempdir_created){
2009
struct dirent **direntries = NULL;
2010
struct dirent *direntry = NULL;
2011
int numentries = scandir(tempdir, &direntries, notdotentries,
2012
alphasort);
2013
if (numentries > 0){
2014
for(int i = 0; i < numentries; i++){
2015
direntry = direntries[i];
2016
char *fullname = NULL;
2017
ret = asprintf(&fullname, "%s/%s", tempdir,
2018
direntry->d_name);
2019
if(ret < 0){
2020
perror_plus("asprintf");
2021
continue;
2022
}
2023
ret = remove(fullname);
2024
if(ret == -1){
2025
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2026
strerror(errno));
2027
}
2028
free(fullname);
2029
}
2030
}
2031
2032
/* need to clean even if 0 because man page doesn't specify */
2033
free(direntries);
2034
if (numentries == -1){
2035
perror_plus("scandir");
2036
}
2037
ret = rmdir(tempdir);
2038
if(ret == -1 and errno != ENOENT){
2039
perror_plus("rmdir");
2040
}
2041
}
2042
2043
if(quit_now){
2044
sigemptyset(&old_sigterm_action.sa_mask);
2045
old_sigterm_action.sa_handler = SIG_DFL;
2046
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2047
&old_sigterm_action,
2048
NULL));
2049
if(ret == -1){
2050
perror_plus("sigaction");
2051
}
2052
do {
2053
ret = raise(signal_received);
2054
} while(ret != 0 and errno == EINTR);
2055
if(ret != 0){
2056
perror_plus("raise");
2057
abort();
2058
}
2059
TEMP_FAILURE_RETRY(pause());
2060
}
2061
2062
return exitcode;
985
986
if (debug){
987
fprintf(stderr, "%s exiting\n", argv[0]);
988
}
989
990
/* Cleanup things */
991
if (sb != NULL)
992
avahi_s_service_browser_free(sb);
993
994
if (mc.server != NULL)
995
avahi_server_free(mc.server);
996
997
if (mc.simple_poll != NULL)
998
avahi_simple_poll_free(mc.simple_poll);
999
free(pubkeyfile);
1000
free(seckeyfile);
1001
1002
return exitcode;
2063
1003
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0