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- Committer: Teddy Hogeborn
- Date: 2008-08-12 19:22:34 UTC
- Revision ID: teddy@fukt.bsnet.se-20080812192234-8bm17713ltih9ud1
* initramfs-tools-hook: New.
* initramfs-tools-hook-conf: New.
* initramfs-tools-hook-conf: New.
- files added:
- network-protocol.txt
- files removed:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- network-hooks.d
- files renamed:
- plugin-runner.c => mandos-client.c
- plugin-runner.xml => mandos-client.xml
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.xml
- files modified:
- Makefile
added
removed
plugins.d/password-request.c
1
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
* Mandos-client - get and decrypt data from a Mandos server
3
* Mandos client - get and decrypt data from a Mandos server
4
4
*
5
5
* This program is partly derived from an example program for an Avahi
6
6
* service browser, downloaded from
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 Björn Påhlsson
12
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
14
13
*
15
14
* This program is free software: you can redistribute it and/or
16
15
* modify it under the terms of the GNU General Public License as
26
25
* along with this program. If not, see
27
26
* <http://www.gnu.org/licenses/>.
28
27
*
29
* Contact the authors at <mandos@recompile.se>.
28
* Contact the authors at <mandos@fukt.bsnet.se>.
30
29
*/
31
30
32
31
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
34
32
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
37
33
#define _FILE_OFFSET_BITS 64
38
#endif
39
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
34
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
36
37
#include <stdio.h> /* fprintf(), stderr, fwrite(), stdout,
38
ferror() */
39
#include <stdint.h> /* uint16_t, uint32_t */
45
40
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
#include <stdbool.h> /* bool, false, true */
41
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
42
srand() */
43
#include <stdbool.h> /* bool, true */
49
44
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
45
strerror(), memcpy(), strcpy() */
46
#include <sys/ioctl.h> /* ioctl */
52
47
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
48
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
49
SOCK_STREAM, INET6_ADDRSTRLEN,
50
uid_t, gid_t */
51
#include <inttypes.h> /* PRIu16 */
57
52
#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 <errno.h> /* perror(), errno,
65
program_invocation_short_name */
66
#include <time.h> /* nanosleep(), time(), sleep() */
53
struct in6_addr, inet_pton(),
54
connect() */
55
#include <assert.h> /* assert() */
56
#include <errno.h> /* perror(), errno */
57
#include <time.h> /* time() */
67
58
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
59
SIOCSIFFLAGS, if_indextoname(),
69
60
if_nametoindex(), IF_NAMESIZE */
70
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
72
*/
73
61
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
getuid(), getgid(), seteuid(),
75
setgid(), pause(), _exit() */
76
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
77
#include <iso646.h> /* not, or, and */
62
getuid(), getgid(), setuid(),
63
setgid() */
64
#include <netinet/in.h>
65
#include <arpa/inet.h> /* inet_pton(), htons */
66
#include <iso646.h> /* not, and */
78
67
#include <argp.h> /* struct argp_option, error_t, struct
79
68
argp_state, struct argp,
80
69
argp_parse(), ARGP_KEY_ARG,
81
70
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
82
#include <signal.h> /* sigemptyset(), sigaddset(),
83
sigaction(), SIGTERM, sig_atomic_t,
84
raise() */
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
86
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
87
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
88
WEXITSTATUS(), WTERMSIG() */
89
#include <grp.h> /* setgroups() */
90
#include <argz.h> /* argz_add_sep(), argz_next(),
91
argz_delete(), argz_append(),
92
argz_stringify(), argz_add(),
93
argz_count() */
94
95
#ifdef __linux__
96
#include <sys/klog.h> /* klogctl() */
97
#endif /* __linux__ */
98
71
99
72
/* Avahi */
100
73
/* All Avahi types, constants and functions
108
81
#include <avahi-common/error.h>
109
82
110
83
/* GnuTLS */
111
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
112
functions:
84
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and functions
113
85
gnutls_*
114
86
init_gnutls_session(),
115
87
GNUTLS_* */
116
#include <gnutls/openpgp.h>
117
/* gnutls_certificate_set_openpgp_key_file(),
118
GNUTLS_OPENPGP_FMT_BASE64 */
88
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
89
GNUTLS_OPENPGP_FMT_BASE64 */
119
90
120
91
/* GPGME */
121
#include <gpgme.h> /* All GPGME types, constants and
122
functions:
92
#include <gpgme.h> /* All GPGME types, constants and functions
123
93
gpgme_*
124
94
GPGME_PROTOCOL_OpenPGP,
125
95
GPG_ERR_NO_* */
126
96
127
97
#define BUFFER_SIZE 256
128
98
129
#define PATHDIR "/conf/conf.d/mandos"
130
#define SECKEY "seckey.txt"
131
#define PUBKEY "pubkey.txt"
132
#define HOOKDIR "/lib/mandos/network-hooks.d"
133
134
99
bool debug = false;
100
static const char *keydir = "/conf/conf.d/mandos";
135
101
static const char mandos_protocol_version[] = "1";
136
const char *argp_program_version = "mandos-client " VERSION;
137
const char *argp_program_bug_address = "<mandos@recompile.se>";
138
static const char sys_class_net[] = "/sys/class/net";
139
char *connect_to = NULL;
140
const char *hookdir = HOOKDIR;
141
uid_t uid = 65534;
142
gid_t gid = 65534;
143
144
/* Doubly linked list that need to be circularly linked when used */
145
typedef struct server{
146
const char *ip;
147
in_port_t port;
148
AvahiIfIndex if_index;
149
int af;
150
struct timespec last_seen;
151
struct server *next;
152
struct server *prev;
153
} server;
102
const char *argp_program_version = "password-request 1.0";
103
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
154
104
155
105
/* Used for passing in values through the Avahi callback functions */
156
106
typedef struct {
107
AvahiSimplePoll *simple_poll;
157
108
AvahiServer *server;
158
109
gnutls_certificate_credentials_t cred;
159
110
unsigned int dh_bits;
160
111
gnutls_dh_params_t dh_params;
161
112
const char *priority;
162
gpgme_ctx_t ctx;
163
server *current_server;
164
char *interfaces;
165
size_t interfaces_size;
166
113
} mandos_context;
167
114
168
/* global so signal handler can reach it*/
169
AvahiSimplePoll *simple_poll;
170
171
sig_atomic_t quit_now = 0;
172
int signal_received = 0;
173
174
/* Function to use when printing errors */
175
void perror_plus(const char *print_text){
176
int e = errno;
177
fprintf(stderr, "Mandos plugin %s: ",
178
program_invocation_short_name);
179
errno = e;
180
perror(print_text);
181
}
182
183
__attribute__((format (gnu_printf, 2, 3)))
184
int fprintf_plus(FILE *stream, const char *format, ...){
185
va_list ap;
186
va_start (ap, format);
187
188
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
189
program_invocation_short_name));
190
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
191
}
192
193
115
/*
194
* Make additional room in "buffer" for at least BUFFER_SIZE more
195
* bytes. "buffer_capacity" is how much is currently allocated,
116
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
117
* "buffer_capacity" is how much is currently allocated,
196
118
* "buffer_length" is how much is already used.
197
119
*/
198
size_t incbuffer(char **buffer, size_t buffer_length,
199
size_t buffer_capacity){
200
if(buffer_length + BUFFER_SIZE > buffer_capacity){
120
size_t adjustbuffer(char **buffer, size_t buffer_length,
121
size_t buffer_capacity){
122
if (buffer_length + BUFFER_SIZE > buffer_capacity){
201
123
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
202
if(buffer == NULL){
124
if (buffer == NULL){
203
125
return 0;
204
126
}
205
127
buffer_capacity += BUFFER_SIZE;
207
129
return buffer_capacity;
208
130
}
209
131
210
/* Add server to set of servers to retry periodically */
211
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
212
int af, server **current_server){
213
int ret;
214
server *new_server = malloc(sizeof(server));
215
if(new_server == NULL){
216
perror_plus("malloc");
217
return false;
218
}
219
*new_server = (server){ .ip = strdup(ip),
220
.port = port,
221
.if_index = if_index,
222
.af = af };
223
if(new_server->ip == NULL){
224
perror_plus("strdup");
225
return false;
226
}
227
/* Special case of first server */
228
if(*current_server == NULL){
229
new_server->next = new_server;
230
new_server->prev = new_server;
231
*current_server = new_server;
232
/* Place the new server last in the list */
233
} else {
234
new_server->next = *current_server;
235
new_server->prev = (*current_server)->prev;
236
new_server->prev->next = new_server;
237
(*current_server)->prev = new_server;
238
}
239
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
240
if(ret == -1){
241
perror_plus("clock_gettime");
242
return false;
243
}
244
return true;
245
}
246
247
132
/*
248
* Initialize GPGME.
133
* Decrypt OpenPGP data using keyrings in HOMEDIR.
134
* Returns -1 on error
249
135
*/
250
static bool init_gpgme(const char *seckey, const char *pubkey,
251
const char *tempdir, mandos_context *mc){
136
static ssize_t pgp_packet_decrypt (const char *cryptotext,
137
size_t crypto_size,
138
char **plaintext,
139
const char *homedir){
140
gpgme_data_t dh_crypto, dh_plain;
141
gpgme_ctx_t ctx;
252
142
gpgme_error_t rc;
143
ssize_t ret;
144
size_t plaintext_capacity = 0;
145
ssize_t plaintext_length = 0;
253
146
gpgme_engine_info_t engine_info;
254
147
255
/*
256
* Helper function to insert pub and seckey to the engine keyring.
257
*/
258
bool import_key(const char *filename){
259
int ret;
260
int fd;
261
gpgme_data_t pgp_data;
262
263
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
264
if(fd == -1){
265
perror_plus("open");
266
return false;
267
}
268
269
rc = gpgme_data_new_from_fd(&pgp_data, fd);
270
if(rc != GPG_ERR_NO_ERROR){
271
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
272
gpgme_strsource(rc), gpgme_strerror(rc));
273
return false;
274
}
275
276
rc = gpgme_op_import(mc->ctx, pgp_data);
277
if(rc != GPG_ERR_NO_ERROR){
278
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
279
gpgme_strsource(rc), gpgme_strerror(rc));
280
return false;
281
}
282
283
ret = (int)TEMP_FAILURE_RETRY(close(fd));
284
if(ret == -1){
285
perror_plus("close");
286
}
287
gpgme_data_release(pgp_data);
288
return true;
289
}
290
291
if(debug){
292
fprintf_plus(stderr, "Initializing GPGME\n");
148
if (debug){
149
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
293
150
}
294
151
295
152
/* Init GPGME */
296
153
gpgme_check_version(NULL);
297
154
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
298
if(rc != GPG_ERR_NO_ERROR){
299
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
300
gpgme_strsource(rc), gpgme_strerror(rc));
301
return false;
155
if (rc != GPG_ERR_NO_ERROR){
156
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
157
gpgme_strsource(rc), gpgme_strerror(rc));
158
return -1;
302
159
}
303
160
304
161
/* Set GPGME home directory for the OpenPGP engine only */
305
rc = gpgme_get_engine_info(&engine_info);
306
if(rc != GPG_ERR_NO_ERROR){
307
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
308
gpgme_strsource(rc), gpgme_strerror(rc));
309
return false;
162
rc = gpgme_get_engine_info (&engine_info);
163
if (rc != GPG_ERR_NO_ERROR){
164
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
165
gpgme_strsource(rc), gpgme_strerror(rc));
166
return -1;
310
167
}
311
168
while(engine_info != NULL){
312
169
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
313
170
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
314
engine_info->file_name, tempdir);
171
engine_info->file_name, homedir);
315
172
break;
316
173
}
317
174
engine_info = engine_info->next;
318
175
}
319
176
if(engine_info == NULL){
320
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
321
tempdir);
322
return false;
323
}
324
325
/* Create new GPGME "context" */
326
rc = gpgme_new(&(mc->ctx));
327
if(rc != GPG_ERR_NO_ERROR){
328
fprintf_plus(stderr, "Mandos plugin mandos-client: "
329
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
330
gpgme_strerror(rc));
331
return false;
332
}
333
334
if(not import_key(pubkey) or not import_key(seckey)){
335
return false;
336
}
337
338
return true;
339
}
340
341
/*
342
* Decrypt OpenPGP data.
343
* Returns -1 on error
344
*/
345
static ssize_t pgp_packet_decrypt(const char *cryptotext,
346
size_t crypto_size,
347
char **plaintext,
348
mandos_context *mc){
349
gpgme_data_t dh_crypto, dh_plain;
350
gpgme_error_t rc;
351
ssize_t ret;
352
size_t plaintext_capacity = 0;
353
ssize_t plaintext_length = 0;
354
355
if(debug){
356
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
177
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
178
return -1;
357
179
}
358
180
359
181
/* Create new GPGME data buffer from memory cryptotext */
360
182
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
361
183
0);
362
if(rc != GPG_ERR_NO_ERROR){
363
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
364
gpgme_strsource(rc), gpgme_strerror(rc));
184
if (rc != GPG_ERR_NO_ERROR){
185
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
186
gpgme_strsource(rc), gpgme_strerror(rc));
365
187
return -1;
366
188
}
367
189
368
190
/* Create new empty GPGME data buffer for the plaintext */
369
191
rc = gpgme_data_new(&dh_plain);
370
if(rc != GPG_ERR_NO_ERROR){
371
fprintf_plus(stderr, "Mandos plugin mandos-client: "
372
"bad gpgme_data_new: %s: %s\n",
373
gpgme_strsource(rc), gpgme_strerror(rc));
192
if (rc != GPG_ERR_NO_ERROR){
193
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
194
gpgme_strsource(rc), gpgme_strerror(rc));
374
195
gpgme_data_release(dh_crypto);
375
196
return -1;
376
197
}
377
198
199
/* Create new GPGME "context" */
200
rc = gpgme_new(&ctx);
201
if (rc != GPG_ERR_NO_ERROR){
202
fprintf(stderr, "bad gpgme_new: %s: %s\n",
203
gpgme_strsource(rc), gpgme_strerror(rc));
204
plaintext_length = -1;
205
goto decrypt_end;
206
}
207
378
208
/* Decrypt data from the cryptotext data buffer to the plaintext
379
209
data buffer */
380
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
381
if(rc != GPG_ERR_NO_ERROR){
382
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
383
gpgme_strsource(rc), gpgme_strerror(rc));
210
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
211
if (rc != GPG_ERR_NO_ERROR){
212
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
213
gpgme_strsource(rc), gpgme_strerror(rc));
384
214
plaintext_length = -1;
385
if(debug){
386
gpgme_decrypt_result_t result;
387
result = gpgme_op_decrypt_result(mc->ctx);
388
if(result == NULL){
389
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
390
} else {
391
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
392
result->unsupported_algorithm);
393
fprintf_plus(stderr, "Wrong key usage: %u\n",
394
result->wrong_key_usage);
395
if(result->file_name != NULL){
396
fprintf_plus(stderr, "File name: %s\n", result->file_name);
397
}
398
gpgme_recipient_t recipient;
399
recipient = result->recipients;
215
goto decrypt_end;
216
}
217
218
if(debug){
219
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
220
}
221
222
if (debug){
223
gpgme_decrypt_result_t result;
224
result = gpgme_op_decrypt_result(ctx);
225
if (result == NULL){
226
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
227
} else {
228
fprintf(stderr, "Unsupported algorithm: %s\n",
229
result->unsupported_algorithm);
230
fprintf(stderr, "Wrong key usage: %u\n",
231
result->wrong_key_usage);
232
if(result->file_name != NULL){
233
fprintf(stderr, "File name: %s\n", result->file_name);
234
}
235
gpgme_recipient_t recipient;
236
recipient = result->recipients;
237
if(recipient){
400
238
while(recipient != NULL){
401
fprintf_plus(stderr, "Public key algorithm: %s\n",
402
gpgme_pubkey_algo_name
403
(recipient->pubkey_algo));
404
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
405
fprintf_plus(stderr, "Secret key available: %s\n",
406
recipient->status == GPG_ERR_NO_SECKEY
407
? "No" : "Yes");
239
fprintf(stderr, "Public key algorithm: %s\n",
240
gpgme_pubkey_algo_name(recipient->pubkey_algo));
241
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
242
fprintf(stderr, "Secret key available: %s\n",
243
recipient->status == GPG_ERR_NO_SECKEY
244
? "No" : "Yes");
408
245
recipient = recipient->next;
409
246
}
410
247
}
411
248
}
412
goto decrypt_end;
413
}
414
415
if(debug){
416
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
417
249
}
418
250
419
251
/* Seek back to the beginning of the GPGME plaintext data buffer */
420
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
421
perror_plus("gpgme_data_seek");
252
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
253
perror("pgpme_data_seek");
422
254
plaintext_length = -1;
423
255
goto decrypt_end;
424
256
}
425
257
426
258
*plaintext = NULL;
427
259
while(true){
428
plaintext_capacity = incbuffer(plaintext,
429
(size_t)plaintext_length,
430
plaintext_capacity);
431
if(plaintext_capacity == 0){
432
perror_plus("incbuffer");
433
plaintext_length = -1;
434
goto decrypt_end;
260
plaintext_capacity = adjustbuffer(plaintext,
261
(size_t)plaintext_length,
262
plaintext_capacity);
263
if (plaintext_capacity == 0){
264
perror("adjustbuffer");
265
plaintext_length = -1;
266
goto decrypt_end;
435
267
}
436
268
437
269
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
438
270
BUFFER_SIZE);
439
271
/* Print the data, if any */
440
if(ret == 0){
272
if (ret == 0){
441
273
/* EOF */
442
274
break;
443
275
}
444
276
if(ret < 0){
445
perror_plus("gpgme_data_read");
277
perror("gpgme_data_read");
446
278
plaintext_length = -1;
447
279
goto decrypt_end;
448
280
}
449
281
plaintext_length += ret;
450
282
}
451
283
452
284
if(debug){
453
fprintf_plus(stderr, "Decrypted password is: ");
285
fprintf(stderr, "Decrypted password is: ");
454
286
for(ssize_t i = 0; i < plaintext_length; i++){
455
287
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
456
288
}
467
299
return plaintext_length;
468
300
}
469
301
470
static const char * safer_gnutls_strerror(int value){
471
const char *ret = gnutls_strerror(value);
472
if(ret == NULL)
302
static const char * safer_gnutls_strerror (int value) {
303
const char *ret = gnutls_strerror (value);
304
if (ret == NULL)
473
305
ret = "(unknown)";
474
306
return ret;
475
307
}
477
309
/* GnuTLS log function callback */
478
310
static void debuggnutls(__attribute__((unused)) int level,
479
311
const char* string){
480
fprintf_plus(stderr, "GnuTLS: %s", string);
312
fprintf(stderr, "GnuTLS: %s", string);
481
313
}
482
314
483
static int init_gnutls_global(const char *pubkeyfilename,
484
const char *seckeyfilename,
485
mandos_context *mc){
315
static int init_gnutls_global(mandos_context *mc,
316
const char *pubkeyfile,
317
const char *seckeyfile){
486
318
int ret;
487
319
488
320
if(debug){
489
fprintf_plus(stderr, "Initializing GnuTLS\n");
321
fprintf(stderr, "Initializing GnuTLS\n");
490
322
}
491
323
492
324
ret = gnutls_global_init();
493
if(ret != GNUTLS_E_SUCCESS){
494
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
495
safer_gnutls_strerror(ret));
325
if (ret != GNUTLS_E_SUCCESS) {
326
fprintf (stderr, "GnuTLS global_init: %s\n",
327
safer_gnutls_strerror(ret));
496
328
return -1;
497
329
}
498
330
499
if(debug){
331
if (debug){
500
332
/* "Use a log level over 10 to enable all debugging options."
501
333
* - GnuTLS manual
502
334
*/
505
337
}
506
338
507
339
/* OpenPGP credentials */
508
ret = gnutls_certificate_allocate_credentials(&mc->cred);
509
if(ret != GNUTLS_E_SUCCESS){
510
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
511
safer_gnutls_strerror(ret));
512
gnutls_global_deinit();
340
gnutls_certificate_allocate_credentials(&mc->cred);
341
if (ret != GNUTLS_E_SUCCESS){
342
fprintf (stderr, "GnuTLS memory error: %s\n",
343
safer_gnutls_strerror(ret));
344
gnutls_global_deinit ();
513
345
return -1;
514
346
}
515
347
516
348
if(debug){
517
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
518
" secret key %s as GnuTLS credentials\n",
519
pubkeyfilename,
520
seckeyfilename);
349
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
350
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
351
seckeyfile);
521
352
}
522
353
523
354
ret = gnutls_certificate_set_openpgp_key_file
524
(mc->cred, pubkeyfilename, seckeyfilename,
525
GNUTLS_OPENPGP_FMT_BASE64);
526
if(ret != GNUTLS_E_SUCCESS){
527
fprintf_plus(stderr,
528
"Error[%d] while reading the OpenPGP key pair ('%s',"
529
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
530
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
531
safer_gnutls_strerror(ret));
355
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
356
if (ret != GNUTLS_E_SUCCESS) {
357
fprintf(stderr,
358
"Error[%d] while reading the OpenPGP key pair ('%s',"
359
" '%s')\n", ret, pubkeyfile, seckeyfile);
360
fprintf(stdout, "The GnuTLS error is: %s\n",
361
safer_gnutls_strerror(ret));
532
362
goto globalfail;
533
363
}
534
364
535
365
/* GnuTLS server initialization */
536
366
ret = gnutls_dh_params_init(&mc->dh_params);
537
if(ret != GNUTLS_E_SUCCESS){
538
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
539
" initialization: %s\n",
540
safer_gnutls_strerror(ret));
367
if (ret != GNUTLS_E_SUCCESS) {
368
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
369
" %s\n", safer_gnutls_strerror(ret));
541
370
goto globalfail;
542
371
}
543
372
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
544
if(ret != GNUTLS_E_SUCCESS){
545
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
546
safer_gnutls_strerror(ret));
373
if (ret != GNUTLS_E_SUCCESS) {
374
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
375
safer_gnutls_strerror(ret));
547
376
goto globalfail;
548
377
}
549
378
550
379
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
551
380
552
381
return 0;
553
382
554
383
globalfail:
555
384
556
385
gnutls_certificate_free_credentials(mc->cred);
557
386
gnutls_global_deinit();
558
gnutls_dh_params_deinit(mc->dh_params);
559
387
return -1;
388
560
389
}
561
390
562
static int init_gnutls_session(gnutls_session_t *session,
563
mandos_context *mc){
391
static int init_gnutls_session(mandos_context *mc,
392
gnutls_session_t *session){
564
393
int ret;
565
394
/* GnuTLS session creation */
566
do {
567
ret = gnutls_init(session, GNUTLS_SERVER);
568
if(quit_now){
569
return -1;
570
}
571
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
572
if(ret != GNUTLS_E_SUCCESS){
573
fprintf_plus(stderr,
574
"Error in GnuTLS session initialization: %s\n",
575
safer_gnutls_strerror(ret));
395
ret = gnutls_init(session, GNUTLS_SERVER);
396
if (ret != GNUTLS_E_SUCCESS){
397
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
398
safer_gnutls_strerror(ret));
576
399
}
577
400
578
401
{
579
402
const char *err;
580
do {
581
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
582
if(quit_now){
583
gnutls_deinit(*session);
584
return -1;
585
}
586
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
587
if(ret != GNUTLS_E_SUCCESS){
588
fprintf_plus(stderr, "Syntax error at: %s\n", err);
589
fprintf_plus(stderr, "GnuTLS error: %s\n",
590
safer_gnutls_strerror(ret));
591
gnutls_deinit(*session);
403
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
404
if (ret != GNUTLS_E_SUCCESS) {
405
fprintf(stderr, "Syntax error at: %s\n", err);
406
fprintf(stderr, "GnuTLS error: %s\n",
407
safer_gnutls_strerror(ret));
408
gnutls_deinit (*session);
592
409
return -1;
593
410
}
594
411
}
595
412
596
do {
597
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
598
mc->cred);
599
if(quit_now){
600
gnutls_deinit(*session);
601
return -1;
602
}
603
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
604
if(ret != GNUTLS_E_SUCCESS){
605
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
606
safer_gnutls_strerror(ret));
607
gnutls_deinit(*session);
413
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
414
mc->cred);
415
if (ret != GNUTLS_E_SUCCESS) {
416
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
417
safer_gnutls_strerror(ret));
418
gnutls_deinit (*session);
608
419
return -1;
609
420
}
610
421
611
422
/* ignore client certificate if any. */
612
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
423
gnutls_certificate_server_set_request (*session,
424
GNUTLS_CERT_IGNORE);
613
425
614
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
426
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
615
427
616
428
return 0;
617
429
}
621
433
__attribute__((unused)) const char *txt){}
622
434
623
435
/* Called when a Mandos server is found */
624
static int start_mandos_communication(const char *ip, in_port_t port,
436
static int start_mandos_communication(const char *ip, uint16_t port,
625
437
AvahiIfIndex if_index,
626
int af, mandos_context *mc){
627
int ret, tcp_sd = -1;
628
ssize_t sret;
629
union {
630
struct sockaddr_in in;
631
struct sockaddr_in6 in6;
632
} to;
438
mandos_context *mc){
439
int ret, tcp_sd;
440
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
633
441
char *buffer = NULL;
634
char *decrypted_buffer = NULL;
442
char *decrypted_buffer;
635
443
size_t buffer_length = 0;
636
444
size_t buffer_capacity = 0;
445
ssize_t decrypted_buffer_size;
637
446
size_t written;
638
int retval = -1;
447
int retval = 0;
448
char interface[IF_NAMESIZE];
639
449
gnutls_session_t session;
640
int pf; /* Protocol family */
641
642
errno = 0;
643
644
if(quit_now){
645
errno = EINTR;
646
return -1;
647
}
648
649
switch(af){
650
case AF_INET6:
651
pf = PF_INET6;
652
break;
653
case AF_INET:
654
pf = PF_INET;
655
break;
656
default:
657
fprintf_plus(stderr, "Bad address family: %d\n", af);
658
errno = EINVAL;
659
return -1;
660
}
661
662
/* If the interface is specified and we have a list of interfaces */
663
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
664
/* Check if the interface is one of the interfaces we are using */
665
bool match = false;
666
{
667
char *interface = NULL;
668
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
669
interface))){
670
if(if_nametoindex(interface) == (unsigned int)if_index){
671
match = true;
672
break;
673
}
674
}
675
}
676
if(not match){
677
/* This interface does not match any in the list, so we don't
678
connect to the server */
679
if(debug){
680
char interface[IF_NAMESIZE];
681
if(if_indextoname((unsigned int)if_index, interface) == NULL){
682
perror_plus("if_indextoname");
683
} else {
684
fprintf_plus(stderr, "Skipping server on non-used interface"
685
" \"%s\"\n",
686
if_indextoname((unsigned int)if_index,
687
interface));
688
}
689
}
450
451
ret = init_gnutls_session (mc, &session);
452
if (ret != 0){
453
return -1;
454
}
455
456
if(debug){
457
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
458
"\n", ip, port);
459
}
460
461
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
462
if(tcp_sd < 0) {
463
perror("socket");
464
return -1;
465
}
466
467
if(debug){
468
if(if_indextoname((unsigned int)if_index, interface) == NULL){
469
perror("if_indextoname");
690
470
return -1;
691
471
}
472
fprintf(stderr, "Binding to interface %s\n", interface);
692
473
}
693
474
694
ret = init_gnutls_session(&session, mc);
695
if(ret != 0){
475
memset(&to,0,sizeof(to)); /* Spurious warning */
476
to.in6.sin6_family = AF_INET6;
477
/* It would be nice to have a way to detect if we were passed an
478
IPv4 address here. Now we assume an IPv6 address. */
479
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
480
if (ret < 0 ){
481
perror("inet_pton");
696
482
return -1;
697
483
}
698
699
if(debug){
700
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
701
PRIuMAX "\n", ip, (uintmax_t)port);
702
}
703
704
tcp_sd = socket(pf, SOCK_STREAM, 0);
705
if(tcp_sd < 0){
706
int e = errno;
707
perror_plus("socket");
708
errno = e;
709
goto mandos_end;
710
}
711
712
if(quit_now){
713
errno = EINTR;
714
goto mandos_end;
715
}
716
717
memset(&to, 0, sizeof(to));
718
if(af == AF_INET6){
719
to.in6.sin6_family = (sa_family_t)af;
720
ret = inet_pton(af, ip, &to.in6.sin6_addr);
721
} else { /* IPv4 */
722
to.in.sin_family = (sa_family_t)af;
723
ret = inet_pton(af, ip, &to.in.sin_addr);
724
}
725
if(ret < 0 ){
726
int e = errno;
727
perror_plus("inet_pton");
728
errno = e;
729
goto mandos_end;
730
}
731
484
if(ret == 0){
732
int e = errno;
733
fprintf_plus(stderr, "Bad address: %s\n", ip);
734
errno = e;
735
goto mandos_end;
736
}
737
if(af == AF_INET6){
738
to.in6.sin6_port = htons(port);
739
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
740
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
741
-Wunreachable-code*/
742
if(if_index == AVAHI_IF_UNSPEC){
743
fprintf_plus(stderr, "An IPv6 link-local address is"
744
" incomplete without a network interface\n");
745
errno = EINVAL;
746
goto mandos_end;
747
}
748
/* Set the network interface number as scope */
749
to.in6.sin6_scope_id = (uint32_t)if_index;
750
}
751
} else {
752
to.in.sin_port = htons(port); /* Spurious warnings from
753
-Wconversion and
754
-Wunreachable-code */
755
}
485
fprintf(stderr, "Bad address: %s\n", ip);
486
return -1;
487
}
488
to.in6.sin6_port = htons(port); /* Spurious warning */
756
489
757
if(quit_now){
758
errno = EINTR;
759
goto mandos_end;
760
}
490
to.in6.sin6_scope_id = (uint32_t)if_index;
761
491
762
492
if(debug){
763
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
764
char interface[IF_NAMESIZE];
765
if(if_indextoname((unsigned int)if_index, interface) == NULL){
766
perror_plus("if_indextoname");
767
} else {
768
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
769
"\n", ip, interface, (uintmax_t)port);
770
}
771
} else {
772
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
773
ip, (uintmax_t)port);
774
}
775
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
776
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
777
const char *pcret;
778
if(af == AF_INET6){
779
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
780
sizeof(addrstr));
781
} else {
782
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
783
sizeof(addrstr));
784
}
785
if(pcret == NULL){
786
perror_plus("inet_ntop");
493
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
494
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");
787
499
} else {
788
500
if(strcmp(addrstr, ip) != 0){
789
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
501
fprintf(stderr, "Canonical address form: %s\n", addrstr);
790
502
}
791
503
}
792
504
}
793
505
794
if(quit_now){
795
errno = EINTR;
796
goto mandos_end;
797
}
798
799
if(af == AF_INET6){
800
ret = connect(tcp_sd, &to.in6, sizeof(to));
801
} else {
802
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
803
}
804
if(ret < 0){
805
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
806
int e = errno;
807
perror_plus("connect");
808
errno = e;
809
}
810
goto mandos_end;
811
}
812
813
if(quit_now){
814
errno = EINTR;
815
goto mandos_end;
816
}
817
506
ret = connect(tcp_sd, &to.in, sizeof(to));
507
if (ret < 0){
508
perror("connect");
509
return -1;
510
}
511
818
512
const char *out = mandos_protocol_version;
819
513
written = 0;
820
while(true){
514
while (true){
821
515
size_t out_size = strlen(out);
822
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
823
out_size - written));
824
if(ret == -1){
825
int e = errno;
826
perror_plus("write");
827
errno = e;
516
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
517
out_size - written));
518
if (ret == -1){
519
perror("write");
520
retval = -1;
828
521
goto mandos_end;
829
522
}
830
523
written += (size_t)ret;
831
524
if(written < out_size){
832
525
continue;
833
526
} else {
834
if(out == mandos_protocol_version){
527
if (out == mandos_protocol_version){
835
528
written = 0;
836
529
out = "\r\n";
837
530
} else {
838
531
break;
839
532
}
840
533
}
841
842
if(quit_now){
843
errno = EINTR;
844
goto mandos_end;
845
}
846
534
}
847
535
848
536
if(debug){
849
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
850
}
851
852
if(quit_now){
853
errno = EINTR;
854
goto mandos_end;
855
}
856
857
/* This casting via intptr_t is to eliminate warning about casting
858
an int to a pointer type. This is exactly how the GnuTLS Guile
859
function "set-session-transport-fd!" does it. */
860
gnutls_transport_set_ptr(session,
861
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
862
863
if(quit_now){
864
errno = EINTR;
865
goto mandos_end;
866
}
867
868
do {
869
ret = gnutls_handshake(session);
870
if(quit_now){
871
errno = EINTR;
872
goto mandos_end;
873
}
537
fprintf(stderr, "Establishing TLS session with %s\n", ip);
538
}
539
540
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
541
542
do{
543
ret = gnutls_handshake (session);
874
544
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
875
545
876
if(ret != GNUTLS_E_SUCCESS){
546
if (ret != GNUTLS_E_SUCCESS){
877
547
if(debug){
878
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
879
gnutls_perror(ret);
548
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
549
gnutls_perror (ret);
880
550
}
881
errno = EPROTO;
551
retval = -1;
882
552
goto mandos_end;
883
553
}
884
554
885
555
/* Read OpenPGP packet that contains the wanted password */
886
556
887
557
if(debug){
888
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
889
" %s\n", ip);
558
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
559
ip);
890
560
}
891
561
892
562
while(true){
893
894
if(quit_now){
895
errno = EINTR;
896
goto mandos_end;
897
}
898
899
buffer_capacity = incbuffer(&buffer, buffer_length,
900
buffer_capacity);
901
if(buffer_capacity == 0){
902
int e = errno;
903
perror_plus("incbuffer");
904
errno = e;
905
goto mandos_end;
906
}
907
908
if(quit_now){
909
errno = EINTR;
910
goto mandos_end;
911
}
912
913
sret = gnutls_record_recv(session, buffer+buffer_length,
914
BUFFER_SIZE);
915
if(sret == 0){
563
buffer_capacity = adjustbuffer(&buffer, buffer_length,
564
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){
916
574
break;
917
575
}
918
if(sret < 0){
919
switch(sret){
576
if (ret < 0){
577
switch(ret){
920
578
case GNUTLS_E_INTERRUPTED:
921
579
case GNUTLS_E_AGAIN:
922
580
break;
923
581
case GNUTLS_E_REHANDSHAKE:
924
do {
925
ret = gnutls_handshake(session);
926
927
if(quit_now){
928
errno = EINTR;
929
goto mandos_end;
930
}
582
do{
583
ret = gnutls_handshake (session);
931
584
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
932
if(ret < 0){
933
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
934
"***\n");
935
gnutls_perror(ret);
936
errno = EPROTO;
585
if (ret < 0){
586
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
587
gnutls_perror (ret);
588
retval = -1;
937
589
goto mandos_end;
938
590
}
939
591
break;
940
592
default:
941
fprintf_plus(stderr, "Unknown error while reading data from"
942
" encrypted session with Mandos server\n");
943
gnutls_bye(session, GNUTLS_SHUT_RDWR);
944
errno = EIO;
593
fprintf(stderr, "Unknown error while reading data from"
594
" encrypted session with Mandos server\n");
595
retval = -1;
596
gnutls_bye (session, GNUTLS_SHUT_RDWR);
945
597
goto mandos_end;
946
598
}
947
599
} else {
948
buffer_length += (size_t) sret;
600
buffer_length += (size_t) ret;
949
601
}
950
602
}
951
603
952
604
if(debug){
953
fprintf_plus(stderr, "Closing TLS session\n");
954
}
955
956
if(quit_now){
957
errno = EINTR;
958
goto mandos_end;
959
}
960
961
do {
962
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
963
if(quit_now){
964
errno = EINTR;
965
goto mandos_end;
966
}
967
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
968
969
if(buffer_length > 0){
970
ssize_t decrypted_buffer_size;
971
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
972
&decrypted_buffer, mc);
973
if(decrypted_buffer_size >= 0){
974
605
fprintf(stderr, "Closing TLS session\n");
606
}
607
608
gnutls_bye (session, GNUTLS_SHUT_RDWR);
609
610
if (buffer_length > 0){
611
decrypted_buffer_size = pgp_packet_decrypt(buffer,
612
buffer_length,
613
&decrypted_buffer,
614
keydir);
615
if (decrypted_buffer_size >= 0){
975
616
written = 0;
976
617
while(written < (size_t) decrypted_buffer_size){
977
if(quit_now){
978
errno = EINTR;
979
goto mandos_end;
980
}
981
982
ret = (int)fwrite(decrypted_buffer + written, 1,
983
(size_t)decrypted_buffer_size - written,
984
stdout);
618
ret = (int)fwrite (decrypted_buffer + written, 1,
619
(size_t)decrypted_buffer_size - written,
620
stdout);
985
621
if(ret == 0 and ferror(stdout)){
986
int e = errno;
987
622
if(debug){
988
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
989
strerror(errno));
623
fprintf(stderr, "Error writing encrypted data: %s\n",
624
strerror(errno));
990
625
}
991
errno = e;
992
goto mandos_end;
626
retval = -1;
627
break;
993
628
}
994
629
written += (size_t)ret;
995
630
}
996
retval = 0;
631
free(decrypted_buffer);
632
} else {
633
retval = -1;
997
634
}
998
635
}
999
636
1000
637
/* Shutdown procedure */
1001
638
1002
639
mandos_end:
1003
{
1004
int e = errno;
1005
free(decrypted_buffer);
1006
free(buffer);
1007
if(tcp_sd >= 0){
1008
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1009
}
1010
if(ret == -1){
1011
if(e == 0){
1012
e = errno;
1013
}
1014
perror_plus("close");
1015
}
1016
gnutls_deinit(session);
1017
errno = e;
1018
if(quit_now){
1019
errno = EINTR;
1020
retval = -1;
1021
}
1022
}
640
free(buffer);
641
close(tcp_sd);
642
gnutls_deinit (session);
1023
643
return retval;
1024
644
}
1025
645
1026
646
static void resolve_callback(AvahiSServiceResolver *r,
1027
647
AvahiIfIndex interface,
1028
AvahiProtocol proto,
648
AVAHI_GCC_UNUSED AvahiProtocol protocol,
1029
649
AvahiResolverEvent event,
1030
650
const char *name,
1031
651
const char *type,
1036
656
AVAHI_GCC_UNUSED AvahiStringList *txt,
1037
657
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1038
658
flags,
1039
void* mc){
1040
if(r == NULL){
1041
return;
1042
}
659
void* userdata) {
660
mandos_context *mc = userdata;
661
assert(r); /* Spurious warning */
1043
662
1044
663
/* Called whenever a service has been resolved successfully or
1045
664
timed out */
1046
665
1047
if(quit_now){
1048
return;
1049
}
1050
1051
switch(event){
666
switch (event) {
1052
667
default:
1053
668
case AVAHI_RESOLVER_FAILURE:
1054
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1055
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1056
domain,
1057
avahi_strerror(avahi_server_errno
1058
(((mandos_context*)mc)->server)));
669
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
670
" of type '%s' in domain '%s': %s\n", name, type, domain,
671
avahi_strerror(avahi_server_errno(mc->server)));
1059
672
break;
1060
673
1061
674
case AVAHI_RESOLVER_FOUND:
1063
676
char ip[AVAHI_ADDRESS_STR_MAX];
1064
677
avahi_address_snprint(ip, sizeof(ip), address);
1065
678
if(debug){
1066
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1067
PRIdMAX ") on port %" PRIu16 "\n", name,
1068
host_name, ip, (intmax_t)interface, port);
679
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
680
PRIu16 ") on port %d\n", name, host_name, ip,
681
interface, port);
1069
682
}
1070
int ret = start_mandos_communication(ip, (in_port_t)port,
1071
interface,
1072
avahi_proto_to_af(proto),
1073
mc);
1074
if(ret == 0){
1075
avahi_simple_poll_quit(simple_poll);
1076
} else {
1077
if(not add_server(ip, (in_port_t)port, interface,
1078
avahi_proto_to_af(proto),
1079
&((mandos_context*)mc)->current_server)){
1080
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1081
" list\n", name);
1082
}
683
int ret = start_mandos_communication(ip, port, interface, mc);
684
if (ret == 0){
685
exit(EXIT_SUCCESS);
1083
686
}
1084
687
}
1085
688
}
1086
689
avahi_s_service_resolver_free(r);
1087
690
}
1088
691
1089
static void browse_callback(AvahiSServiceBrowser *b,
1090
AvahiIfIndex interface,
1091
AvahiProtocol protocol,
1092
AvahiBrowserEvent event,
1093
const char *name,
1094
const char *type,
1095
const char *domain,
1096
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1097
flags,
1098
void* mc){
1099
if(b == NULL){
1100
return;
1101
}
692
static void browse_callback( AvahiSServiceBrowser *b,
693
AvahiIfIndex interface,
694
AvahiProtocol protocol,
695
AvahiBrowserEvent event,
696
const char *name,
697
const char *type,
698
const char *domain,
699
AVAHI_GCC_UNUSED AvahiLookupResultFlags
700
flags,
701
void* userdata) {
702
mandos_context *mc = userdata;
703
assert(b); /* Spurious warning */
1102
704
1103
705
/* Called whenever a new services becomes available on the LAN or
1104
706
is removed from the LAN */
1105
707
1106
if(quit_now){
1107
return;
1108
}
1109
1110
switch(event){
708
switch (event) {
1111
709
default:
1112
710
case AVAHI_BROWSER_FAILURE:
1113
711
1114
fprintf_plus(stderr, "(Avahi browser) %s\n",
1115
avahi_strerror(avahi_server_errno
1116
(((mandos_context*)mc)->server)));
1117
avahi_simple_poll_quit(simple_poll);
712
fprintf(stderr, "(Avahi browser) %s\n",
713
avahi_strerror(avahi_server_errno(mc->server)));
714
avahi_simple_poll_quit(mc->simple_poll);
1118
715
return;
1119
716
1120
717
case AVAHI_BROWSER_NEW:
1123
720
the callback function is called the Avahi server will free the
1124
721
resolver for us. */
1125
722
1126
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1127
interface, protocol, name, type,
1128
domain, protocol, 0,
1129
resolve_callback, mc) == NULL)
1130
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1131
" %s\n", name,
1132
avahi_strerror(avahi_server_errno
1133
(((mandos_context*)mc)->server)));
723
if (!(avahi_s_service_resolver_new(mc->server, interface,
724
protocol, name, type, domain,
725
AVAHI_PROTO_INET6, 0,
726
resolve_callback, mc)))
727
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
728
name, avahi_strerror(avahi_server_errno(mc->server)));
1134
729
break;
1135
730
1136
731
case AVAHI_BROWSER_REMOVE:
1139
734
case AVAHI_BROWSER_ALL_FOR_NOW:
1140
735
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1141
736
if(debug){
1142
fprintf_plus(stderr, "No Mandos server found, still"
1143
" searching...\n");
737
fprintf(stderr, "No Mandos server found, still searching...\n");
1144
738
}
1145
739
break;
1146
740
}
1147
741
}
1148
742
1149
/* Signal handler that stops main loop after SIGTERM */
1150
static void handle_sigterm(int sig){
1151
if(quit_now){
1152
return;
1153
}
1154
quit_now = 1;
1155
signal_received = sig;
1156
int old_errno = errno;
1157
/* set main loop to exit */
1158
if(simple_poll != NULL){
1159
avahi_simple_poll_quit(simple_poll);
1160
}
1161
errno = old_errno;
1162
}
1163
1164
bool get_flags(const char *ifname, struct ifreq *ifr){
1165
int ret;
1166
error_t ret_errno;
1167
1168
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1169
if(s < 0){
1170
ret_errno = errno;
1171
perror_plus("socket");
1172
errno = ret_errno;
1173
return false;
1174
}
1175
strcpy(ifr->ifr_name, ifname);
1176
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1177
if(ret == -1){
1178
if(debug){
1179
ret_errno = errno;
1180
perror_plus("ioctl SIOCGIFFLAGS");
1181
errno = ret_errno;
1182
}
1183
return false;
1184
}
1185
return true;
1186
}
1187
1188
bool good_flags(const char *ifname, const struct ifreq *ifr){
1189
1190
/* Reject the loopback device */
1191
if(ifr->ifr_flags & IFF_LOOPBACK){
1192
if(debug){
1193
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1194
ifname);
1195
}
1196
return false;
1197
}
1198
/* Accept point-to-point devices only if connect_to is specified */
1199
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1200
if(debug){
1201
fprintf_plus(stderr, "Accepting point-to-point interface"
1202
" \"%s\"\n", ifname);
1203
}
1204
return true;
1205
}
1206
/* Otherwise, reject non-broadcast-capable devices */
1207
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1208
if(debug){
1209
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1210
" \"%s\"\n", ifname);
1211
}
1212
return false;
1213
}
1214
/* Reject non-ARP interfaces (including dummy interfaces) */
1215
if(ifr->ifr_flags & IFF_NOARP){
1216
if(debug){
1217
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1218
ifname);
1219
}
1220
return false;
1221
}
1222
1223
/* Accept this device */
1224
if(debug){
1225
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1226
}
1227
return true;
1228
}
1229
1230
/*
1231
* This function determines if a directory entry in /sys/class/net
1232
* corresponds to an acceptable network device.
1233
* (This function is passed to scandir(3) as a filter function.)
1234
*/
1235
int good_interface(const struct dirent *if_entry){
1236
if(if_entry->d_name[0] == '.'){
1237
return 0;
1238
}
1239
1240
struct ifreq ifr;
1241
if(not get_flags(if_entry->d_name, &ifr)){
1242
if(debug){
1243
fprintf_plus(stderr, "Failed to get flags for interface "
1244
"\"%s\"\n", if_entry->d_name);
1245
}
1246
return 0;
1247
}
1248
1249
if(not good_flags(if_entry->d_name, &ifr)){
1250
return 0;
1251
}
1252
return 1;
1253
}
1254
1255
/*
1256
* This function determines if a network interface is up.
1257
*/
1258
bool interface_is_up(const char *interface){
1259
struct ifreq ifr;
1260
if(not get_flags(interface, &ifr)){
1261
if(debug){
1262
fprintf_plus(stderr, "Failed to get flags for interface "
1263
"\"%s\"\n", interface);
1264
}
1265
return false;
1266
}
1267
1268
return (bool)(ifr.ifr_flags & IFF_UP);
1269
}
1270
1271
/*
1272
* This function determines if a network interface is running
1273
*/
1274
bool interface_is_running(const char *interface){
1275
struct ifreq ifr;
1276
if(not get_flags(interface, &ifr)){
1277
if(debug){
1278
fprintf_plus(stderr, "Failed to get flags for interface "
1279
"\"%s\"\n", interface);
1280
}
1281
return false;
1282
}
1283
1284
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1285
}
1286
1287
int notdotentries(const struct dirent *direntry){
1288
/* Skip "." and ".." */
1289
if(direntry->d_name[0] == '.'
1290
and (direntry->d_name[1] == '\0'
1291
or (direntry->d_name[1] == '.'
1292
and direntry->d_name[2] == '\0'))){
1293
return 0;
1294
}
1295
return 1;
1296
}
1297
1298
/* Is this directory entry a runnable program? */
1299
int runnable_hook(const struct dirent *direntry){
1300
int ret;
1301
size_t sret;
1302
struct stat st;
1303
1304
if((direntry->d_name)[0] == '\0'){
1305
/* Empty name? */
1306
return 0;
1307
}
1308
1309
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1310
"abcdefghijklmnopqrstuvwxyz"
1311
"0123456789"
1312
"_-");
1313
if((direntry->d_name)[sret] != '\0'){
1314
/* Contains non-allowed characters */
1315
if(debug){
1316
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1317
direntry->d_name);
1318
}
1319
return 0;
1320
}
1321
1322
char *fullname = NULL;
1323
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1324
if(ret < 0){
1325
perror_plus("asprintf");
1326
return 0;
1327
}
1328
1329
ret = stat(fullname, &st);
1330
if(ret == -1){
1331
if(debug){
1332
perror_plus("Could not stat hook");
1333
}
1334
return 0;
1335
}
1336
if(not (S_ISREG(st.st_mode))){
1337
/* Not a regular file */
1338
if(debug){
1339
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1340
direntry->d_name);
1341
}
1342
return 0;
1343
}
1344
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1345
/* Not executable */
1346
if(debug){
1347
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1348
direntry->d_name);
1349
}
1350
return 0;
1351
}
1352
if(debug){
1353
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1354
direntry->d_name);
1355
}
1356
return 1;
1357
}
1358
1359
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1360
mandos_context *mc){
1361
int ret;
1362
struct timespec now;
1363
struct timespec waited_time;
1364
intmax_t block_time;
1365
1366
while(true){
1367
if(mc->current_server == NULL){
1368
if (debug){
1369
fprintf_plus(stderr, "Wait until first server is found."
1370
" No timeout!\n");
1371
}
1372
ret = avahi_simple_poll_iterate(s, -1);
743
/* Combines file name and path and returns the malloced new
744
string. some sane checks could/should be added */
745
static const char *combinepath(const char *first, const char *second){
746
size_t f_len = strlen(first);
747
size_t s_len = strlen(second);
748
char *tmp = malloc(f_len + s_len + 2);
749
if (tmp == NULL){
750
return NULL;
751
}
752
if(f_len > 0){
753
memcpy(tmp, first, f_len); /* Spurious warning */
754
}
755
tmp[f_len] = '/';
756
if(s_len > 0){
757
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
758
}
759
tmp[f_len + 1 + s_len] = '\0';
760
return tmp;
761
}
762
763
764
int main(int argc, char *argv[]){
765
AvahiSServiceBrowser *sb = NULL;
766
int error;
767
int ret;
768
int exitcode = EXIT_SUCCESS;
769
const char *interface = "eth0";
770
struct ifreq network;
771
int sd;
772
uid_t uid;
773
gid_t gid;
774
char *connect_to = NULL;
775
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
776
const char *pubkeyfile = "pubkey.txt";
777
const char *seckeyfile = "seckey.txt";
778
mandos_context mc = { .simple_poll = NULL, .server = NULL,
779
.dh_bits = 1024, .priority = "SECURE256"};
780
bool gnutls_initalized = false;
781
782
{
783
struct argp_option options[] = {
784
{ .name = "debug", .key = 128,
785
.doc = "Debug mode", .group = 3 },
786
{ .name = "connect", .key = 'c',
787
.arg = "IP",
788
.doc = "Connect directly to a sepcified mandos server",
789
.group = 1 },
790
{ .name = "interface", .key = 'i',
791
.arg = "INTERFACE",
792
.doc = "Interface that Avahi will conntect through",
793
.group = 1 },
794
{ .name = "keydir", .key = 'd',
795
.arg = "KEYDIR",
796
.doc = "Directory where the openpgp keyring is",
797
.group = 1 },
798
{ .name = "seckey", .key = 's',
799
.arg = "SECKEY",
800
.doc = "Secret openpgp key for gnutls authentication",
801
.group = 1 },
802
{ .name = "pubkey", .key = 'p',
803
.arg = "PUBKEY",
804
.doc = "Public openpgp key for gnutls authentication",
805
.group = 2 },
806
{ .name = "dh-bits", .key = 129,
807
.arg = "BITS",
808
.doc = "dh-bits to use in gnutls communication",
809
.group = 2 },
810
{ .name = "priority", .key = 130,
811
.arg = "PRIORITY",
812
.doc = "GNUTLS priority", .group = 1 },
813
{ .name = NULL }
814
};
815
816
817
error_t parse_opt (int key, char *arg,
818
struct argp_state *state) {
819
/* Get the INPUT argument from `argp_parse', which we know is
820
a pointer to our plugin list pointer. */
821
switch (key) {
822
case 128:
823
debug = true;
824
break;
825
case 'c':
826
connect_to = arg;
827
break;
828
case 'i':
829
interface = arg;
830
break;
831
case 'd':
832
keydir = arg;
833
break;
834
case 's':
835
seckeyfile = arg;
836
break;
837
case 'p':
838
pubkeyfile = arg;
839
break;
840
case 129:
841
errno = 0;
842
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
843
if (errno){
844
perror("strtol");
845
exit(EXIT_FAILURE);
846
}
847
break;
848
case 130:
849
mc.priority = arg;
850
break;
851
case ARGP_KEY_ARG:
852
argp_usage (state);
853
break;
854
case ARGP_KEY_END:
855
break;
856
default:
857
return ARGP_ERR_UNKNOWN;
858
}
859
return 0;
860
}
861
862
struct argp argp = { .options = options, .parser = parse_opt,
863
.args_doc = "",
864
.doc = "Mandos client -- Get and decrypt"
865
" passwords from mandos server" };
866
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
867
if (ret == ARGP_ERR_UNKNOWN){
868
fprintf(stderr, "Unknown error while parsing arguments\n");
869
exitcode = EXIT_FAILURE;
870
goto end;
871
}
872
}
873
874
pubkeyfile = combinepath(keydir, pubkeyfile);
875
if (pubkeyfile == NULL){
876
perror("combinepath");
877
exitcode = EXIT_FAILURE;
878
goto end;
879
}
880
881
seckeyfile = combinepath(keydir, seckeyfile);
882
if (seckeyfile == NULL){
883
perror("combinepath");
884
exitcode = EXIT_FAILURE;
885
goto end;
886
}
887
888
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
889
if (ret == -1){
890
fprintf(stderr, "init_gnutls_global failed\n");
891
exitcode = EXIT_FAILURE;
892
goto end;
1373
893
} else {
1374
if (debug){
1375
fprintf_plus(stderr, "Check current_server if we should run"
1376
" it, or wait\n");
894
gnutls_initalized = true;
895
}
896
897
/* If the interface is down, bring it up */
898
{
899
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
900
if(sd < 0) {
901
perror("socket");
902
exitcode = EXIT_FAILURE;
903
goto end;
1377
904
}
1378
/* the current time */
1379
ret = clock_gettime(CLOCK_MONOTONIC, &now);
905
strcpy(network.ifr_name, interface); /* Spurious warning */
906
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1380
907
if(ret == -1){
1381
perror_plus("clock_gettime");
1382
return -1;
1383
}
1384
/* Calculating in ms how long time between now and server
1385
who we visted longest time ago. Now - last seen. */
1386
waited_time.tv_sec = (now.tv_sec
1387
- mc->current_server->last_seen.tv_sec);
1388
waited_time.tv_nsec = (now.tv_nsec
1389
- mc->current_server->last_seen.tv_nsec);
1390
/* total time is 10s/10,000ms.
1391
Converting to s from ms by dividing by 1,000,
1392
and ns to ms by dividing by 1,000,000. */
1393
block_time = ((retry_interval
1394
- ((intmax_t)waited_time.tv_sec * 1000))
1395
- ((intmax_t)waited_time.tv_nsec / 1000000));
1396
1397
if (debug){
1398
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1399
block_time);
1400
}
1401
1402
if(block_time <= 0){
1403
ret = start_mandos_communication(mc->current_server->ip,
1404
mc->current_server->port,
1405
mc->current_server->if_index,
1406
mc->current_server->af, mc);
1407
if(ret == 0){
1408
avahi_simple_poll_quit(s);
1409
return 0;
1410
}
1411
ret = clock_gettime(CLOCK_MONOTONIC,
1412
&mc->current_server->last_seen);
1413
if(ret == -1){
1414
perror_plus("clock_gettime");
1415
return -1;
1416
}
1417
mc->current_server = mc->current_server->next;
1418
block_time = 0; /* Call avahi to find new Mandos
1419
servers, but don't block */
1420
}
1421
1422
ret = avahi_simple_poll_iterate(s, (int)block_time);
1423
}
1424
if(ret != 0){
1425
if (ret > 0 or errno != EINTR){
1426
return (ret != 1) ? ret : 0;
1427
}
1428
}
1429
}
1430
}
1431
1432
/* Set effective uid to 0, return errno */
1433
error_t raise_privileges(void){
1434
error_t old_errno = errno;
1435
error_t ret_errno = 0;
1436
if(seteuid(0) == -1){
1437
ret_errno = errno;
1438
perror_plus("seteuid");
1439
}
1440
errno = old_errno;
1441
return ret_errno;
1442
}
1443
1444
/* Set effective and real user ID to 0. Return errno. */
1445
error_t raise_privileges_permanently(void){
1446
error_t old_errno = errno;
1447
error_t ret_errno = raise_privileges();
1448
if(ret_errno != 0){
1449
errno = old_errno;
1450
return ret_errno;
1451
}
1452
if(setuid(0) == -1){
1453
ret_errno = errno;
1454
perror_plus("seteuid");
1455
}
1456
errno = old_errno;
1457
return ret_errno;
1458
}
1459
1460
/* Set effective user ID to unprivileged saved user ID */
1461
error_t lower_privileges(void){
1462
error_t old_errno = errno;
1463
error_t ret_errno = 0;
1464
if(seteuid(uid) == -1){
1465
ret_errno = errno;
1466
perror_plus("seteuid");
1467
}
1468
errno = old_errno;
1469
return ret_errno;
1470
}
1471
1472
/* Lower privileges permanently */
1473
error_t lower_privileges_permanently(void){
1474
error_t old_errno = errno;
1475
error_t ret_errno = 0;
1476
if(setuid(uid) == -1){
1477
ret_errno = errno;
1478
perror_plus("setuid");
1479
}
1480
errno = old_errno;
1481
return ret_errno;
1482
}
1483
1484
bool run_network_hooks(const char *mode, const char *interface,
1485
const float delay){
1486
struct dirent **direntries;
1487
struct dirent *direntry;
1488
int ret;
1489
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1490
alphasort);
1491
if(numhooks == -1){
1492
if(errno == ENOENT){
1493
if(debug){
1494
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1495
" found\n", hookdir);
1496
}
1497
} else {
1498
perror_plus("scandir");
1499
}
1500
} else {
1501
int devnull = open("/dev/null", O_RDONLY);
1502
for(int i = 0; i < numhooks; i++){
1503
direntry = direntries[i];
1504
char *fullname = NULL;
1505
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1506
if(ret < 0){
1507
perror_plus("asprintf");
1508
continue;
1509
}
1510
if(debug){
1511
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1512
direntry->d_name);
1513
}
1514
pid_t hook_pid = fork();
1515
if(hook_pid == 0){
1516
/* Child */
1517
/* Raise privileges */
1518
raise_privileges_permanently();
1519
/* Set group */
1520
errno = 0;
1521
ret = setgid(0);
1522
if(ret == -1){
1523
perror_plus("setgid");
1524
}
1525
/* Reset supplementary groups */
1526
errno = 0;
1527
ret = setgroups(0, NULL);
1528
if(ret == -1){
1529
perror_plus("setgroups");
1530
}
1531
dup2(devnull, STDIN_FILENO);
1532
close(devnull);
1533
dup2(STDERR_FILENO, STDOUT_FILENO);
1534
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1535
if(ret == -1){
1536
perror_plus("setenv");
1537
_exit(EX_OSERR);
1538
}
1539
ret = setenv("DEVICE", interface, 1);
1540
if(ret == -1){
1541
perror_plus("setenv");
1542
_exit(EX_OSERR);
1543
}
1544
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1545
if(ret == -1){
1546
perror_plus("setenv");
1547
_exit(EX_OSERR);
1548
}
1549
ret = setenv("MODE", mode, 1);
1550
if(ret == -1){
1551
perror_plus("setenv");
1552
_exit(EX_OSERR);
1553
}
1554
char *delaystring;
1555
ret = asprintf(&delaystring, "%f", delay);
1556
if(ret == -1){
1557
perror_plus("asprintf");
1558
_exit(EX_OSERR);
1559
}
1560
ret = setenv("DELAY", delaystring, 1);
1561
if(ret == -1){
1562
free(delaystring);
1563
perror_plus("setenv");
1564
_exit(EX_OSERR);
1565
}
1566
free(delaystring);
1567
if(connect_to != NULL){
1568
ret = setenv("CONNECT", connect_to, 1);
1569
if(ret == -1){
1570
perror_plus("setenv");
1571
_exit(EX_OSERR);
1572
}
1573
}
1574
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1575
perror_plus("execl");
1576
_exit(EXIT_FAILURE);
1577
}
1578
} else {
1579
int status;
1580
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1581
perror_plus("waitpid");
1582
free(fullname);
1583
continue;
1584
}
1585
if(WIFEXITED(status)){
1586
if(WEXITSTATUS(status) != 0){
1587
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1588
" with status %d\n", direntry->d_name,
1589
WEXITSTATUS(status));
1590
free(fullname);
1591
continue;
1592
}
1593
} else if(WIFSIGNALED(status)){
1594
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1595
" signal %d\n", direntry->d_name,
1596
WTERMSIG(status));
1597
free(fullname);
1598
continue;
1599
} else {
1600
fprintf_plus(stderr, "Warning: network hook \"%s\""
1601
" crashed\n", direntry->d_name);
1602
free(fullname);
1603
continue;
1604
}
1605
}
1606
free(fullname);
1607
if(debug){
1608
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1609
direntry->d_name);
1610
}
1611
}
1612
close(devnull);
1613
}
1614
return true;
1615
}
1616
1617
error_t bring_up_interface(const char *const interface,
1618
const float delay){
1619
int sd = -1;
1620
error_t old_errno = errno;
1621
error_t ret_errno = 0;
1622
int ret, ret_setflags;
1623
struct ifreq network;
1624
unsigned int if_index = if_nametoindex(interface);
1625
if(if_index == 0){
1626
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1627
errno = old_errno;
1628
return ENXIO;
1629
}
1630
1631
if(quit_now){
1632
errno = old_errno;
1633
return EINTR;
1634
}
1635
1636
if(not interface_is_up(interface)){
1637
if(not get_flags(interface, &network) and debug){
1638
ret_errno = errno;
1639
fprintf_plus(stderr, "Failed to get flags for interface "
1640
"\"%s\"\n", interface);
1641
return ret_errno;
1642
}
1643
network.ifr_flags |= IFF_UP;
1644
1645
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1646
if(sd < 0){
1647
ret_errno = errno;
1648
perror_plus("socket");
1649
errno = old_errno;
1650
return ret_errno;
1651
}
1652
1653
if(quit_now){
908
perror("ioctl SIOCGIFFLAGS");
909
exitcode = EXIT_FAILURE;
910
goto end;
911
}
912
if((network.ifr_flags & IFF_UP) == 0){
913
network.ifr_flags |= IFF_UP;
914
ret = ioctl(sd, SIOCSIFFLAGS, &network);
915
if(ret == -1){
916
perror("ioctl SIOCSIFFLAGS");
917
exitcode = EXIT_FAILURE;
918
goto end;
919
}
920
}
1654
921
close(sd);
1655
errno = old_errno;
1656
return EINTR;
1657
}
1658
1659
if(debug){
1660
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1661
interface);
1662
}
1663
1664
/* Raise priviliges */
1665
raise_privileges();
1666
1667
#ifdef __linux__
1668
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1669
messages about the network interface to mess up the prompt */
1670
int ret_linux = klogctl(8, NULL, 5);
1671
bool restore_loglevel = true;
1672
if(ret_linux == -1){
1673
restore_loglevel = false;
1674
perror_plus("klogctl");
1675
}
1676
#endif /* __linux__ */
1677
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1678
ret_errno = errno;
1679
#ifdef __linux__
1680
if(restore_loglevel){
1681
ret_linux = klogctl(7, NULL, 0);
1682
if(ret_linux == -1){
1683
perror_plus("klogctl");
922
}
923
924
uid = getuid();
925
gid = getgid();
926
927
ret = setuid(uid);
928
if (ret == -1){
929
perror("setuid");
930
}
931
932
setgid(gid);
933
if (ret == -1){
934
perror("setgid");
935
}
936
937
if_index = (AvahiIfIndex) if_nametoindex(interface);
938
if(if_index == 0){
939
fprintf(stderr, "No such interface: \"%s\"\n", interface);
940
exit(EXIT_FAILURE);
941
}
942
943
if(connect_to != NULL){
944
/* Connect directly, do not use Zeroconf */
945
/* (Mainly meant for debugging) */
946
char *address = strrchr(connect_to, ':');
947
if(address == NULL){
948
fprintf(stderr, "No colon in address\n");
949
exitcode = EXIT_FAILURE;
950
goto end;
1684
951
}
1685
}
1686
#endif /* __linux__ */
1687
1688
/* Lower privileges */
1689
lower_privileges();
1690
1691
/* Close the socket */
1692
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1693
if(ret == -1){
1694
perror_plus("close");
1695
}
1696
1697
if(ret_setflags == -1){
1698
errno = ret_errno;
1699
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1700
errno = old_errno;
1701
return ret_errno;
1702
}
1703
} else if(debug){
1704
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1705
interface);
1706
}
1707
1708
/* Sleep checking until interface is running.
1709
Check every 0.25s, up to total time of delay */
1710
for(int i=0; i < delay * 4; i++){
1711
if(interface_is_running(interface)){
1712
break;
1713
}
1714
struct timespec sleeptime = { .tv_nsec = 250000000 };
1715
ret = nanosleep(&sleeptime, NULL);
1716
if(ret == -1 and errno != EINTR){
1717
perror_plus("nanosleep");
1718
}
1719
}
1720
1721
errno = old_errno;
1722
return 0;
1723
}
1724
1725
error_t take_down_interface(const char *const interface){
1726
int sd = -1;
1727
error_t old_errno = errno;
1728
error_t ret_errno = 0;
1729
int ret, ret_setflags;
1730
struct ifreq network;
1731
unsigned int if_index = if_nametoindex(interface);
1732
if(if_index == 0){
1733
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1734
errno = old_errno;
1735
return ENXIO;
1736
}
1737
if(interface_is_up(interface)){
1738
if(not get_flags(interface, &network) and debug){
1739
ret_errno = errno;
1740
fprintf_plus(stderr, "Failed to get flags for interface "
1741
"\"%s\"\n", interface);
1742
return ret_errno;
1743
}
1744
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1745
1746
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1747
if(sd < 0){
1748
ret_errno = errno;
1749
perror_plus("socket");
1750
errno = old_errno;
1751
return ret_errno;
1752
}
1753
1754
if(debug){
1755
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1756
interface);
1757
}
1758
1759
/* Raise priviliges */
1760
raise_privileges();
1761
1762
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1763
ret_errno = errno;
1764
1765
/* Lower privileges */
1766
lower_privileges();
1767
1768
/* Close the socket */
1769
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1770
if(ret == -1){
1771
perror_plus("close");
1772
}
1773
1774
if(ret_setflags == -1){
1775
errno = ret_errno;
1776
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1777
errno = old_errno;
1778
return ret_errno;
1779
}
1780
} else if(debug){
1781
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1782
interface);
1783
}
1784
1785
errno = old_errno;
1786
return 0;
1787
}
1788
1789
int main(int argc, char *argv[]){
1790
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1791
.priority = "SECURE256:!CTYPE-X.509:"
1792
"+CTYPE-OPENPGP", .current_server = NULL,
1793
.interfaces = NULL, .interfaces_size = 0 };
1794
AvahiSServiceBrowser *sb = NULL;
1795
error_t ret_errno;
1796
int ret;
1797
intmax_t tmpmax;
1798
char *tmp;
1799
int exitcode = EXIT_SUCCESS;
1800
char *interfaces_to_take_down = NULL;
1801
size_t interfaces_to_take_down_size = 0;
1802
char tempdir[] = "/tmp/mandosXXXXXX";
1803
bool tempdir_created = false;
1804
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1805
const char *seckey = PATHDIR "/" SECKEY;
1806
const char *pubkey = PATHDIR "/" PUBKEY;
1807
char *interfaces_hooks = NULL;
1808
size_t interfaces_hooks_size = 0;
1809
1810
bool gnutls_initialized = false;
1811
bool gpgme_initialized = false;
1812
float delay = 2.5f;
1813
double retry_interval = 10; /* 10s between trying a server and
1814
retrying the same server again */
1815
1816
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1817
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1818
1819
uid = getuid();
1820
gid = getgid();
1821
1822
/* Lower any group privileges we might have, just to be safe */
1823
errno = 0;
1824
ret = setgid(gid);
1825
if(ret == -1){
1826
perror_plus("setgid");
1827
}
1828
1829
/* Lower user privileges (temporarily) */
1830
errno = 0;
1831
ret = seteuid(uid);
1832
if(ret == -1){
1833
perror_plus("seteuid");
1834
}
1835
1836
if(quit_now){
1837
goto end;
1838
}
1839
1840
{
1841
struct argp_option options[] = {
1842
{ .name = "debug", .key = 128,
1843
.doc = "Debug mode", .group = 3 },
1844
{ .name = "connect", .key = 'c',
1845
.arg = "ADDRESS:PORT",
1846
.doc = "Connect directly to a specific Mandos server",
1847
.group = 1 },
1848
{ .name = "interface", .key = 'i',
1849
.arg = "NAME",
1850
.doc = "Network interface that will be used to search for"
1851
" Mandos servers",
1852
.group = 1 },
1853
{ .name = "seckey", .key = 's',
1854
.arg = "FILE",
1855
.doc = "OpenPGP secret key file base name",
1856
.group = 1 },
1857
{ .name = "pubkey", .key = 'p',
1858
.arg = "FILE",
1859
.doc = "OpenPGP public key file base name",
1860
.group = 2 },
1861
{ .name = "dh-bits", .key = 129,
1862
.arg = "BITS",
1863
.doc = "Bit length of the prime number used in the"
1864
" Diffie-Hellman key exchange",
1865
.group = 2 },
1866
{ .name = "priority", .key = 130,
1867
.arg = "STRING",
1868
.doc = "GnuTLS priority string for the TLS handshake",
1869
.group = 1 },
1870
{ .name = "delay", .key = 131,
1871
.arg = "SECONDS",
1872
.doc = "Maximum delay to wait for interface startup",
1873
.group = 2 },
1874
{ .name = "retry", .key = 132,
1875
.arg = "SECONDS",
1876
.doc = "Retry interval used when denied by the Mandos server",
1877
.group = 2 },
1878
{ .name = "network-hook-dir", .key = 133,
1879
.arg = "DIR",
1880
.doc = "Directory where network hooks are located",
1881
.group = 2 },
1882
/*
1883
* These reproduce what we would get without ARGP_NO_HELP
1884
*/
1885
{ .name = "help", .key = '?',
1886
.doc = "Give this help list", .group = -1 },
1887
{ .name = "usage", .key = -3,
1888
.doc = "Give a short usage message", .group = -1 },
1889
{ .name = "version", .key = 'V',
1890
.doc = "Print program version", .group = -1 },
1891
{ .name = NULL }
1892
};
1893
1894
error_t parse_opt(int key, char *arg,
1895
struct argp_state *state){
1896
952
errno = 0;
1897
switch(key){
1898
case 128: /* --debug */
1899
debug = true;
1900
break;
1901
case 'c': /* --connect */
1902
connect_to = arg;
1903
break;
1904
case 'i': /* --interface */
1905
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1906
arg, (int)',');
1907
if(ret_errno != 0){
1908
argp_error(state, "%s", strerror(ret_errno));
1909
}
1910
break;
1911
case 's': /* --seckey */
1912
seckey = arg;
1913
break;
1914
case 'p': /* --pubkey */
1915
pubkey = arg;
1916
break;
1917
case 129: /* --dh-bits */
1918
errno = 0;
1919
tmpmax = strtoimax(arg, &tmp, 10);
1920
if(errno != 0 or tmp == arg or *tmp != '\0'
1921
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1922
argp_error(state, "Bad number of DH bits");
1923
}
1924
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1925
break;
1926
case 130: /* --priority */
1927
mc.priority = arg;
1928
break;
1929
case 131: /* --delay */
1930
errno = 0;
1931
delay = strtof(arg, &tmp);
1932
if(errno != 0 or tmp == arg or *tmp != '\0'){
1933
argp_error(state, "Bad delay");
1934
}
1935
case 132: /* --retry */
1936
errno = 0;
1937
retry_interval = strtod(arg, &tmp);
1938
if(errno != 0 or tmp == arg or *tmp != '\0'
1939
or (retry_interval * 1000) > INT_MAX
1940
or retry_interval < 0){
1941
argp_error(state, "Bad retry interval");
1942
}
1943
break;
1944
case 133: /* --network-hook-dir */
1945
hookdir = arg;
1946
break;
1947
/*
1948
* These reproduce what we would get without ARGP_NO_HELP
1949
*/
1950
case '?': /* --help */
1951
argp_state_help(state, state->out_stream,
1952
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1953
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1954
case -3: /* --usage */
1955
argp_state_help(state, state->out_stream,
1956
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1957
case 'V': /* --version */
1958
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1959
exit(argp_err_exit_status);
1960
break;
1961
default:
1962
return ARGP_ERR_UNKNOWN;
1963
}
1964
return errno;
1965
}
1966
1967
struct argp argp = { .options = options, .parser = parse_opt,
1968
.args_doc = "",
1969
.doc = "Mandos client -- Get and decrypt"
1970
" passwords from a Mandos server" };
1971
ret = argp_parse(&argp, argc, argv,
1972
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1973
switch(ret){
1974
case 0:
1975
break;
1976
case ENOMEM:
1977
default:
1978
errno = ret;
1979
perror_plus("argp_parse");
1980
exitcode = EX_OSERR;
1981
goto end;
1982
case EINVAL:
1983
exitcode = EX_USAGE;
1984
goto end;
1985
}
1986
}
1987
1988
{
1989
/* Work around Debian bug #633582:
1990
<http://bugs.debian.org/633582> */
1991
1992
/* Re-raise priviliges */
1993
if(raise_privileges() == 0){
1994
struct stat st;
1995
1996
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1997
int seckey_fd = open(seckey, O_RDONLY);
1998
if(seckey_fd == -1){
1999
perror_plus("open");
2000
} else {
2001
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2002
if(ret == -1){
2003
perror_plus("fstat");
2004
} else {
2005
if(S_ISREG(st.st_mode)
2006
and st.st_uid == 0 and st.st_gid == 0){
2007
ret = fchown(seckey_fd, uid, gid);
2008
if(ret == -1){
2009
perror_plus("fchown");
2010
}
2011
}
2012
}
2013
TEMP_FAILURE_RETRY(close(seckey_fd));
2014
}
2015
}
2016
2017
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2018
int pubkey_fd = open(pubkey, O_RDONLY);
2019
if(pubkey_fd == -1){
2020
perror_plus("open");
2021
} else {
2022
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2023
if(ret == -1){
2024
perror_plus("fstat");
2025
} else {
2026
if(S_ISREG(st.st_mode)
2027
and st.st_uid == 0 and st.st_gid == 0){
2028
ret = fchown(pubkey_fd, uid, gid);
2029
if(ret == -1){
2030
perror_plus("fchown");
2031
}
2032
}
2033
}
2034
TEMP_FAILURE_RETRY(close(pubkey_fd));
2035
}
2036
}
2037
2038
/* Lower privileges */
2039
lower_privileges();
2040
}
2041
}
2042
2043
/* Remove invalid interface names (except "none") */
2044
{
2045
char *interface = NULL;
2046
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2047
interface))){
2048
if(strcmp(interface, "none") != 0
2049
and if_nametoindex(interface) == 0){
2050
if(interface[0] != '\0'){
2051
fprintf_plus(stderr, "Not using nonexisting interface"
2052
" \"%s\"\n", interface);
2053
}
2054
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2055
interface = NULL;
2056
}
2057
}
2058
}
2059
2060
/* Run network hooks */
2061
{
2062
if(mc.interfaces != NULL){
2063
interfaces_hooks = malloc(mc.interfaces_size);
2064
if(interfaces_hooks == NULL){
2065
perror_plus("malloc");
953
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
954
if(errno){
955
perror("Bad port number");
956
exitcode = EXIT_FAILURE;
2066
957
goto end;
2067
958
}
2068
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2069
interfaces_hooks_size = mc.interfaces_size;
2070
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2071
(int)',');
2072
}
2073
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2074
interfaces_hooks : "", delay)){
2075
goto end;
2076
}
2077
}
2078
2079
if(not debug){
2080
avahi_set_log_function(empty_log);
2081
}
2082
2083
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2084
from the signal handler */
2085
/* Initialize the pseudo-RNG for Avahi */
2086
srand((unsigned int) time(NULL));
2087
simple_poll = avahi_simple_poll_new();
2088
if(simple_poll == NULL){
2089
fprintf_plus(stderr,
2090
"Avahi: Failed to create simple poll object.\n");
2091
exitcode = EX_UNAVAILABLE;
2092
goto end;
2093
}
2094
2095
sigemptyset(&sigterm_action.sa_mask);
2096
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2097
if(ret == -1){
2098
perror_plus("sigaddset");
2099
exitcode = EX_OSERR;
2100
goto end;
2101
}
2102
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2103
if(ret == -1){
2104
perror_plus("sigaddset");
2105
exitcode = EX_OSERR;
2106
goto end;
2107
}
2108
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2109
if(ret == -1){
2110
perror_plus("sigaddset");
2111
exitcode = EX_OSERR;
2112
goto end;
2113
}
2114
/* Need to check if the handler is SIG_IGN before handling:
2115
| [[info:libc:Initial Signal Actions]] |
2116
| [[info:libc:Basic Signal Handling]] |
2117
*/
2118
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2119
if(ret == -1){
2120
perror_plus("sigaction");
2121
return EX_OSERR;
2122
}
2123
if(old_sigterm_action.sa_handler != SIG_IGN){
2124
ret = sigaction(SIGINT, &sigterm_action, NULL);
2125
if(ret == -1){
2126
perror_plus("sigaction");
2127
exitcode = EX_OSERR;
2128
goto end;
2129
}
2130
}
2131
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2132
if(ret == -1){
2133
perror_plus("sigaction");
2134
return EX_OSERR;
2135
}
2136
if(old_sigterm_action.sa_handler != SIG_IGN){
2137
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2138
if(ret == -1){
2139
perror_plus("sigaction");
2140
exitcode = EX_OSERR;
2141
goto end;
2142
}
2143
}
2144
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2145
if(ret == -1){
2146
perror_plus("sigaction");
2147
return EX_OSERR;
2148
}
2149
if(old_sigterm_action.sa_handler != SIG_IGN){
2150
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2151
if(ret == -1){
2152
perror_plus("sigaction");
2153
exitcode = EX_OSERR;
2154
goto end;
2155
}
2156
}
2157
2158
/* If no interfaces were specified, make a list */
2159
if(mc.interfaces == NULL){
2160
struct dirent **direntries;
2161
/* Look for any good interfaces */
2162
ret = scandir(sys_class_net, &direntries, good_interface,
2163
alphasort);
2164
if(ret >= 1){
2165
/* Add all found interfaces to interfaces list */
2166
for(int i = 0; i < ret; ++i){
2167
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2168
direntries[i]->d_name);
2169
if(ret_errno != 0){
2170
perror_plus("argz_add");
2171
continue;
2172
}
2173
if(debug){
2174
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2175
direntries[i]->d_name);
2176
}
2177
}
2178
free(direntries);
2179
} else {
2180
free(direntries);
2181
fprintf_plus(stderr, "Could not find a network interface\n");
2182
exitcode = EXIT_FAILURE;
2183
goto end;
2184
}
2185
}
2186
2187
/* Bring up interfaces which are down, and remove any "none"s */
2188
{
2189
char *interface = NULL;
2190
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2191
interface))){
2192
/* If interface name is "none", stop bringing up interfaces.
2193
Also remove all instances of "none" from the list */
2194
if(strcmp(interface, "none") == 0){
2195
argz_delete(&mc.interfaces, &mc.interfaces_size,
2196
interface);
2197
interface = NULL;
2198
while((interface = argz_next(mc.interfaces,
2199
mc.interfaces_size, interface))){
2200
if(strcmp(interface, "none") == 0){
2201
argz_delete(&mc.interfaces, &mc.interfaces_size,
2202
interface);
2203
interface = NULL;
2204
}
2205
}
2206
break;
2207
}
2208
bool interface_was_up = interface_is_up(interface);
2209
ret = bring_up_interface(interface, delay);
2210
if(not interface_was_up){
2211
if(ret != 0){
2212
errno = ret;
2213
perror_plus("Failed to bring up interface");
2214
} else {
2215
ret_errno = argz_add(&interfaces_to_take_down,
2216
&interfaces_to_take_down_size,
2217
interface);
2218
}
2219
}
2220
}
2221
if(debug and (interfaces_to_take_down == NULL)){
2222
fprintf_plus(stderr, "No interfaces were brought up\n");
2223
}
2224
}
2225
2226
/* If we only got one interface, explicitly use only that one */
2227
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2228
if(debug){
2229
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2230
mc.interfaces);
2231
}
2232
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2233
}
2234
2235
if(quit_now){
2236
goto end;
2237
}
2238
2239
ret = init_gnutls_global(pubkey, seckey, &mc);
2240
if(ret == -1){
2241
fprintf_plus(stderr, "init_gnutls_global failed\n");
2242
exitcode = EX_UNAVAILABLE;
2243
goto end;
2244
} else {
2245
gnutls_initialized = true;
2246
}
2247
2248
if(quit_now){
2249
goto end;
2250
}
2251
2252
if(mkdtemp(tempdir) == NULL){
2253
perror_plus("mkdtemp");
2254
goto end;
2255
}
2256
tempdir_created = true;
2257
2258
if(quit_now){
2259
goto end;
2260
}
2261
2262
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2263
fprintf_plus(stderr, "init_gpgme failed\n");
2264
exitcode = EX_UNAVAILABLE;
2265
goto end;
2266
} else {
2267
gpgme_initialized = true;
2268
}
2269
2270
if(quit_now){
2271
goto end;
2272
}
2273
2274
if(connect_to != NULL){
2275
/* Connect directly, do not use Zeroconf */
2276
/* (Mainly meant for debugging) */
2277
char *address = strrchr(connect_to, ':');
2278
2279
if(address == NULL){
2280
fprintf_plus(stderr, "No colon in address\n");
2281
exitcode = EX_USAGE;
2282
goto end;
2283
}
2284
2285
if(quit_now){
2286
goto end;
2287
}
2288
2289
in_port_t port;
2290
errno = 0;
2291
tmpmax = strtoimax(address+1, &tmp, 10);
2292
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2293
or tmpmax != (in_port_t)tmpmax){
2294
fprintf_plus(stderr, "Bad port number\n");
2295
exitcode = EX_USAGE;
2296
goto end;
2297
}
2298
2299
if(quit_now){
2300
goto end;
2301
}
2302
2303
port = (in_port_t)tmpmax;
2304
*address = '\0';
2305
/* Colon in address indicates IPv6 */
2306
int af;
2307
if(strchr(connect_to, ':') != NULL){
2308
af = AF_INET6;
2309
/* Accept [] around IPv6 address - see RFC 5952 */
2310
if(connect_to[0] == '[' and address[-1] == ']')
2311
{
2312
connect_to++;
2313
address[-1] = '\0';
2314
}
2315
} else {
2316
af = AF_INET;
2317
}
2318
address = connect_to;
2319
2320
if(quit_now){
2321
goto end;
2322
}
2323
2324
while(not quit_now){
2325
ret = start_mandos_communication(address, port, if_index, af,
2326
&mc);
2327
if(quit_now or ret == 0){
2328
break;
2329
}
2330
if(debug){
2331
fprintf_plus(stderr, "Retrying in %d seconds\n",
2332
(int)retry_interval);
2333
}
2334
sleep((int)retry_interval);
2335
}
2336
2337
if (not quit_now){
2338
exitcode = EXIT_SUCCESS;
2339
}
2340
2341
goto end;
2342
}
2343
2344
if(quit_now){
2345
goto end;
2346
}
2347
2348
{
2349
AvahiServerConfig config;
2350
/* Do not publish any local Zeroconf records */
2351
avahi_server_config_init(&config);
2352
config.publish_hinfo = 0;
2353
config.publish_addresses = 0;
2354
config.publish_workstation = 0;
2355
config.publish_domain = 0;
2356
2357
/* Allocate a new server */
2358
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2359
&config, NULL, NULL, &ret_errno);
2360
2361
/* Free the Avahi configuration data */
2362
avahi_server_config_free(&config);
2363
}
2364
2365
/* Check if creating the Avahi server object succeeded */
2366
if(mc.server == NULL){
2367
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2368
avahi_strerror(ret_errno));
2369
exitcode = EX_UNAVAILABLE;
2370
goto end;
2371
}
2372
2373
if(quit_now){
2374
goto end;
2375
}
2376
2377
/* Create the Avahi service browser */
2378
sb = avahi_s_service_browser_new(mc.server, if_index,
2379
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2380
NULL, 0, browse_callback,
2381
(void *)&mc);
2382
if(sb == NULL){
2383
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2384
avahi_strerror(avahi_server_errno(mc.server)));
2385
exitcode = EX_UNAVAILABLE;
2386
goto end;
2387
}
2388
2389
if(quit_now){
2390
goto end;
2391
}
2392
2393
/* Run the main loop */
2394
2395
if(debug){
2396
fprintf_plus(stderr, "Starting Avahi loop search\n");
2397
}
2398
2399
ret = avahi_loop_with_timeout(simple_poll,
2400
(int)(retry_interval * 1000), &mc);
2401
if(debug){
2402
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2403
(ret == 0) ? "successfully" : "with error");
2404
}
2405
959
*address = '\0';
960
address = connect_to;
961
ret = start_mandos_communication(address, port, if_index, &mc);
962
if(ret < 0){
963
exitcode = EXIT_FAILURE;
964
} else {
965
exitcode = EXIT_SUCCESS;
966
}
967
goto end;
968
}
969
970
if (not debug){
971
avahi_set_log_function(empty_log);
972
}
973
974
/* Initialize the pseudo-RNG for Avahi */
975
srand((unsigned int) time(NULL));
976
977
/* Allocate main Avahi loop object */
978
mc.simple_poll = avahi_simple_poll_new();
979
if (mc.simple_poll == NULL) {
980
fprintf(stderr, "Avahi: Failed to create simple poll"
981
" object.\n");
982
exitcode = EXIT_FAILURE;
983
goto end;
984
}
985
986
{
987
AvahiServerConfig config;
988
/* Do not publish any local Zeroconf records */
989
avahi_server_config_init(&config);
990
config.publish_hinfo = 0;
991
config.publish_addresses = 0;
992
config.publish_workstation = 0;
993
config.publish_domain = 0;
994
995
/* Allocate a new server */
996
mc.server = avahi_server_new(avahi_simple_poll_get
997
(mc.simple_poll), &config, NULL,
998
NULL, &error);
999
1000
/* Free the Avahi configuration data */
1001
avahi_server_config_free(&config);
1002
}
1003
1004
/* Check if creating the Avahi server object succeeded */
1005
if (mc.server == NULL) {
1006
fprintf(stderr, "Failed to create Avahi server: %s\n",
1007
avahi_strerror(error));
1008
exitcode = EXIT_FAILURE;
1009
goto end;
1010
}
1011
1012
/* Create the Avahi service browser */
1013
sb = avahi_s_service_browser_new(mc.server, if_index,
1014
AVAHI_PROTO_INET6,
1015
"_mandos._tcp", NULL, 0,
1016
browse_callback, &mc);
1017
if (sb == NULL) {
1018
fprintf(stderr, "Failed to create service browser: %s\n",
1019
avahi_strerror(avahi_server_errno(mc.server)));
1020
exitcode = EXIT_FAILURE;
1021
goto end;
1022
}
1023
1024
/* Run the main loop */
1025
1026
if (debug){
1027
fprintf(stderr, "Starting Avahi loop search\n");
1028
}
1029
1030
avahi_simple_poll_loop(mc.simple_poll);
1031
2406
1032
end:
2407
2408
if(debug){
2409
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2410
}
2411
2412
/* Cleanup things */
2413
free(mc.interfaces);
2414
2415
if(sb != NULL)
2416
avahi_s_service_browser_free(sb);
2417
2418
if(mc.server != NULL)
2419
avahi_server_free(mc.server);
2420
2421
if(simple_poll != NULL)
2422
avahi_simple_poll_free(simple_poll);
2423
2424
if(gnutls_initialized){
2425
gnutls_certificate_free_credentials(mc.cred);
2426
gnutls_global_deinit();
2427
gnutls_dh_params_deinit(mc.dh_params);
2428
}
2429
2430
if(gpgme_initialized){
2431
gpgme_release(mc.ctx);
2432
}
2433
2434
/* Cleans up the circular linked list of Mandos servers the client
2435
has seen */
2436
if(mc.current_server != NULL){
2437
mc.current_server->prev->next = NULL;
2438
while(mc.current_server != NULL){
2439
server *next = mc.current_server->next;
2440
free(mc.current_server);
2441
mc.current_server = next;
2442
}
2443
}
2444
2445
/* Re-raise priviliges */
2446
{
2447
raise_privileges();
2448
2449
/* Run network hooks */
2450
run_network_hooks("stop", interfaces_hooks != NULL ?
2451
interfaces_hooks : "", delay);
2452
2453
/* Take down the network interfaces which were brought up */
2454
{
2455
char *interface = NULL;
2456
while((interface=argz_next(interfaces_to_take_down,
2457
interfaces_to_take_down_size,
2458
interface))){
2459
ret_errno = take_down_interface(interface);
2460
if(ret_errno != 0){
2461
errno = ret_errno;
2462
perror_plus("Failed to take down interface");
2463
}
2464
}
2465
if(debug and (interfaces_to_take_down == NULL)){
2466
fprintf_plus(stderr, "No interfaces needed to be taken"
2467
" down\n");
2468
}
2469
}
2470
2471
lower_privileges_permanently();
2472
}
2473
2474
free(interfaces_to_take_down);
2475
free(interfaces_hooks);
2476
2477
/* Removes the GPGME temp directory and all files inside */
2478
if(tempdir_created){
2479
struct dirent **direntries = NULL;
2480
struct dirent *direntry = NULL;
2481
int numentries = scandir(tempdir, &direntries, notdotentries,
2482
alphasort);
2483
if (numentries > 0){
2484
for(int i = 0; i < numentries; i++){
2485
direntry = direntries[i];
2486
char *fullname = NULL;
2487
ret = asprintf(&fullname, "%s/%s", tempdir,
2488
direntry->d_name);
2489
if(ret < 0){
2490
perror_plus("asprintf");
2491
continue;
2492
}
2493
ret = remove(fullname);
2494
if(ret == -1){
2495
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2496
strerror(errno));
2497
}
2498
free(fullname);
2499
}
2500
}
2501
2502
/* need to clean even if 0 because man page doesn't specify */
2503
free(direntries);
2504
if (numentries == -1){
2505
perror_plus("scandir");
2506
}
2507
ret = rmdir(tempdir);
2508
if(ret == -1 and errno != ENOENT){
2509
perror_plus("rmdir");
2510
}
2511
}
2512
2513
if(quit_now){
2514
sigemptyset(&old_sigterm_action.sa_mask);
2515
old_sigterm_action.sa_handler = SIG_DFL;
2516
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2517
&old_sigterm_action,
2518
NULL));
2519
if(ret == -1){
2520
perror_plus("sigaction");
2521
}
2522
do {
2523
ret = raise(signal_received);
2524
} while(ret != 0 and errno == EINTR);
2525
if(ret != 0){
2526
perror_plus("raise");
2527
abort();
2528
}
2529
TEMP_FAILURE_RETRY(pause());
2530
}
2531
2532
return exitcode;
1033
1034
if (debug){
1035
fprintf(stderr, "%s exiting\n", argv[0]);
1036
}
1037
1038
/* Cleanup things */
1039
if (sb != NULL)
1040
avahi_s_service_browser_free(sb);
1041
1042
if (mc.server != NULL)
1043
avahi_server_free(mc.server);
1044
1045
if (mc.simple_poll != NULL)
1046
avahi_simple_poll_free(mc.simple_poll);
1047
free(pubkeyfile);
1048
free(seckeyfile);
1049
1050
if (gnutls_initalized){
1051
gnutls_certificate_free_credentials(mc.cred);
1052
gnutls_global_deinit ();
1053
}
1054
1055
return exitcode;
2533
1056
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0