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- Committer: Teddy Hogeborn
- Date: 2008-09-17 00:34:09 UTC
- Revision ID: teddy@fukt.bsnet.se-20080917003409-bxbjsc4o69nx40t6
* .bzr-builddeb/default.conf: New.
* Makefile (install-server): Do not create directories that
should already be present in a
normal system.
(install-client-nokey): - '' - Also specify non-executable
mode for "initramfs-tools-hook-conf".
* README: Improved wording. Use real copyright mark.
* debian/changelog: New.
* debian/compat: - '' -
* debian/control: - '' -
* debian/copyright: - '' -
* debian/mandos-client.README.Debian: - '' -
* debian/mandos-client.dirs: - '' -
* debian/mandos-client.lintian-overrides: - '' -
* debian/mandos-client.postinst: - '' -
* debian/mandos-client.postrm: - '' -
* debian/mandos.dirs: - '' -
* debian/mandos.lintian-overrides: - '' -
* debian/rules: - '' -
* default-mandos: - '' -
* Makefile (install-server): Do not create directories that
should already be present in a
normal system.
(install-client-nokey): - '' - Also specify non-executable
mode for "initramfs-tools-hook-conf".
* README: Improved wording. Use real copyright mark.
* debian/changelog: New.
* debian/compat: - '' -
* debian/control: - '' -
* debian/copyright: - '' -
* debian/mandos-client.README.Debian: - '' -
* debian/mandos-client.dirs: - '' -
* debian/mandos-client.lintian-overrides: - '' -
* debian/mandos-client.postinst: - '' -
* debian/mandos-client.postrm: - '' -
* debian/mandos.dirs: - '' -
* debian/mandos.lintian-overrides: - '' -
* debian/rules: - '' -
* default-mandos: - '' -
- files added:
- etc-plugins.d-README
- files removed:
- DBUS-API
- debian/po
- debian/source
- network-hooks.d
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
1
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
* Mandos-client - get and decrypt data from a Mandos server
3
* Mandos client - get and decrypt data from a Mandos server
4
4
*
5
5
* This program is partly derived from an example program for an Avahi
6
6
* service browser, downloaded from
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2012 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
34
40
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
36
42
37
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
38
stdout, 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
45
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
46
#include <sys/ioctl.h> /* ioctl */
52
47
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
48
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
49
SOCK_STREAM, INET6_ADDRSTRLEN,
50
uid_t, gid_t, open(), opendir(), DIR */
51
#include <sys/stat.h> /* open() */
57
52
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
53
struct in6_addr, inet_pton(),
54
connect() */
59
55
#include <fcntl.h> /* open() */
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
*/
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
56
#include <dirent.h> /* opendir(), struct dirent, readdir() */
57
#include <inttypes.h> /* PRIu16 */
64
58
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
59
#include <errno.h> /* perror(), errno */
60
#include <time.h> /* time() */
68
61
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
62
SIOCSIFFLAGS, if_indextoname(),
70
63
if_nametoindex(), IF_NAMESIZE */
71
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
*/
64
#include <netinet/in.h>
74
65
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
78
#include <iso646.h> /* not, or, and */
66
getuid(), getgid(), setuid(),
67
setgid() */
68
#include <arpa/inet.h> /* inet_pton(), htons */
69
#include <iso646.h> /* not, and */
79
70
#include <argp.h> /* struct argp_option, error_t, struct
80
71
argp_state, struct argp,
81
72
argp_parse(), ARGP_KEY_ARG,
82
73
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
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
WEXITSTATUS(), WTERMSIG() */
90
#include <grp.h> /* setgroups() */
91
92
#ifdef __linux__
93
#include <sys/klog.h> /* klogctl() */
94
#endif /* __linux__ */
95
74
96
75
/* Avahi */
97
76
/* All Avahi types, constants and functions
110
89
gnutls_*
111
90
init_gnutls_session(),
112
91
GNUTLS_* */
113
#include <gnutls/openpgp.h>
114
/* gnutls_certificate_set_openpgp_key_file(),
115
GNUTLS_OPENPGP_FMT_BASE64 */
92
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
93
GNUTLS_OPENPGP_FMT_BASE64 */
116
94
117
95
/* GPGME */
118
96
#include <gpgme.h> /* All GPGME types, constants and
123
101
124
102
#define BUFFER_SIZE 256
125
103
104
/*
105
#define PATHDIR "/conf/conf.d/mandos"
106
*/
107
126
108
#define PATHDIR "/conf/conf.d/mandos"
127
109
#define SECKEY "seckey.txt"
128
110
#define PUBKEY "pubkey.txt"
129
#define HOOKDIR "/lib/mandos/network-hooks.d"
130
111
131
112
bool debug = false;
132
113
static const char mandos_protocol_version[] = "1";
133
const char *argp_program_version = "mandos-client " VERSION;
134
const char *argp_program_bug_address = "<mandos@recompile.se>";
135
static const char sys_class_net[] = "/sys/class/net";
136
char *connect_to = NULL;
137
const char *hookdir = HOOKDIR;
138
uid_t uid = 65534;
139
gid_t gid = 65534;
140
141
/* Doubly linked list that need to be circularly linked when used */
142
typedef struct server{
143
const char *ip;
144
uint16_t port;
145
AvahiIfIndex if_index;
146
int af;
147
struct timespec last_seen;
148
struct server *next;
149
struct server *prev;
150
} server;
114
const char *argp_program_version = "mandos-client 1.0";
115
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
151
116
152
117
/* Used for passing in values through the Avahi callback functions */
153
118
typedef struct {
158
123
gnutls_dh_params_t dh_params;
159
124
const char *priority;
160
125
gpgme_ctx_t ctx;
161
server *current_server;
162
126
} mandos_context;
163
127
164
/* global context so signal handler can reach it*/
165
mandos_context mc = { .simple_poll = NULL, .server = NULL,
166
.dh_bits = 1024, .priority = "SECURE256"
167
":!CTYPE-X.509:+CTYPE-OPENPGP",
168
.current_server = NULL };
169
170
sig_atomic_t quit_now = 0;
171
int signal_received = 0;
172
173
/* Function to use when printing errors */
174
void perror_plus(const char *print_text){
175
int e = errno;
176
fprintf(stderr, "Mandos plugin %s: ",
177
program_invocation_short_name);
178
errno = e;
179
perror(print_text);
180
}
181
182
__attribute__((format (gnu_printf, 2, 3)))
183
int fprintf_plus(FILE *stream, const char *format, ...){
184
va_list ap;
185
va_start (ap, format);
186
187
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
188
program_invocation_short_name));
189
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
190
}
191
192
128
/*
193
* Make additional room in "buffer" for at least BUFFER_SIZE more
194
* bytes. "buffer_capacity" is how much is currently allocated,
129
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
130
* "buffer_capacity" is how much is currently allocated,
195
131
* "buffer_length" is how much is already used.
196
132
*/
197
size_t incbuffer(char **buffer, size_t buffer_length,
198
size_t buffer_capacity){
199
if(buffer_length + BUFFER_SIZE > buffer_capacity){
133
size_t adjustbuffer(char **buffer, size_t buffer_length,
134
size_t buffer_capacity){
135
if (buffer_length + BUFFER_SIZE > buffer_capacity){
200
136
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
201
if(buffer == NULL){
137
if (buffer == NULL){
202
138
return 0;
203
139
}
204
140
buffer_capacity += BUFFER_SIZE;
206
142
return buffer_capacity;
207
143
}
208
144
209
/* Add server to set of servers to retry periodically */
210
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
211
int af){
212
int ret;
213
server *new_server = malloc(sizeof(server));
214
if(new_server == NULL){
215
perror_plus("malloc");
216
return false;
217
}
218
*new_server = (server){ .ip = strdup(ip),
219
.port = port,
220
.if_index = if_index,
221
.af = af };
222
if(new_server->ip == NULL){
223
perror_plus("strdup");
224
return false;
225
}
226
/* Special case of first server */
227
if (mc.current_server == NULL){
228
new_server->next = new_server;
229
new_server->prev = new_server;
230
mc.current_server = new_server;
231
/* Place the new server last in the list */
232
} else {
233
new_server->next = mc.current_server;
234
new_server->prev = mc.current_server->prev;
235
new_server->prev->next = new_server;
236
mc.current_server->prev = new_server;
237
}
238
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
239
if(ret == -1){
240
perror_plus("clock_gettime");
241
return false;
242
}
243
return true;
244
}
245
246
145
/*
247
146
* Initialize GPGME.
248
147
*/
249
static bool init_gpgme(const char *seckey, const char *pubkey,
250
const char *tempdir){
148
static bool init_gpgme(mandos_context *mc, const char *seckey,
149
const char *pubkey, const char *tempdir){
150
int ret;
251
151
gpgme_error_t rc;
252
152
gpgme_engine_info_t engine_info;
253
153
254
154
255
155
/*
256
* Helper function to insert pub and seckey to the engine keyring.
156
* Helper function to insert pub and seckey to the enigne keyring.
257
157
*/
258
158
bool import_key(const char *filename){
259
int ret;
260
159
int fd;
261
160
gpgme_data_t pgp_data;
262
161
263
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
162
fd = TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
264
163
if(fd == -1){
265
perror_plus("open");
164
perror("open");
266
165
return false;
267
166
}
268
167
269
168
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));
169
if (rc != GPG_ERR_NO_ERROR){
170
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
171
gpgme_strsource(rc), gpgme_strerror(rc));
172
return false;
173
}
174
175
rc = gpgme_op_import(mc->ctx, pgp_data);
176
if (rc != GPG_ERR_NO_ERROR){
177
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
178
gpgme_strsource(rc), gpgme_strerror(rc));
179
return false;
180
}
181
182
ret = TEMP_FAILURE_RETRY(close(fd));
284
183
if(ret == -1){
285
perror_plus("close");
184
perror("close");
286
185
}
287
186
gpgme_data_release(pgp_data);
288
187
return true;
289
188
}
290
189
291
if(debug){
292
fprintf_plus(stderr, "Initializing GPGME\n");
190
if (debug){
191
fprintf(stderr, "Initialize gpgme\n");
293
192
}
294
193
295
194
/* Init GPGME */
296
195
gpgme_check_version(NULL);
297
196
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));
197
if (rc != GPG_ERR_NO_ERROR){
198
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
199
gpgme_strsource(rc), gpgme_strerror(rc));
301
200
return false;
302
201
}
303
202
304
/* 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));
203
/* Set GPGME home directory for the OpenPGP engine only */
204
rc = gpgme_get_engine_info (&engine_info);
205
if (rc != GPG_ERR_NO_ERROR){
206
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
207
gpgme_strsource(rc), gpgme_strerror(rc));
309
208
return false;
310
209
}
311
210
while(engine_info != NULL){
317
216
engine_info = engine_info->next;
318
217
}
319
218
if(engine_info == NULL){
320
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
321
tempdir);
219
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
322
220
return false;
323
221
}
324
222
325
223
/* 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;
224
rc = gpgme_new(&(mc->ctx));
225
if (rc != GPG_ERR_NO_ERROR){
226
fprintf(stderr, "bad gpgme_new: %s: %s\n",
227
gpgme_strsource(rc), gpgme_strerror(rc));
228
return false;
229
}
230
231
if (not import_key(pubkey) or not import_key(seckey)){
232
return false;
233
}
234
235
return true;
339
236
}
340
237
341
238
/*
342
239
* Decrypt OpenPGP data.
343
240
* Returns -1 on error
344
241
*/
345
static ssize_t pgp_packet_decrypt(const char *cryptotext,
346
size_t crypto_size,
347
char **plaintext){
242
static ssize_t pgp_packet_decrypt (const mandos_context *mc,
243
const char *cryptotext,
244
size_t crypto_size,
245
char **plaintext){
348
246
gpgme_data_t dh_crypto, dh_plain;
349
247
gpgme_error_t rc;
350
248
ssize_t ret;
351
249
size_t plaintext_capacity = 0;
352
250
ssize_t plaintext_length = 0;
353
251
354
if(debug){
355
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
252
if (debug){
253
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
356
254
}
357
255
358
256
/* Create new GPGME data buffer from memory cryptotext */
359
257
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
360
258
0);
361
if(rc != GPG_ERR_NO_ERROR){
362
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
363
gpgme_strsource(rc), gpgme_strerror(rc));
259
if (rc != GPG_ERR_NO_ERROR){
260
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
261
gpgme_strsource(rc), gpgme_strerror(rc));
364
262
return -1;
365
263
}
366
264
367
265
/* Create new empty GPGME data buffer for the plaintext */
368
266
rc = gpgme_data_new(&dh_plain);
369
if(rc != GPG_ERR_NO_ERROR){
370
fprintf_plus(stderr, "Mandos plugin mandos-client: "
371
"bad gpgme_data_new: %s: %s\n",
372
gpgme_strsource(rc), gpgme_strerror(rc));
267
if (rc != GPG_ERR_NO_ERROR){
268
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
269
gpgme_strsource(rc), gpgme_strerror(rc));
373
270
gpgme_data_release(dh_crypto);
374
271
return -1;
375
272
}
376
273
377
274
/* Decrypt data from the cryptotext data buffer to the plaintext
378
275
data buffer */
379
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
380
if(rc != GPG_ERR_NO_ERROR){
381
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
382
gpgme_strsource(rc), gpgme_strerror(rc));
276
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
277
if (rc != GPG_ERR_NO_ERROR){
278
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
279
gpgme_strsource(rc), gpgme_strerror(rc));
383
280
plaintext_length = -1;
384
if(debug){
281
if (debug){
385
282
gpgme_decrypt_result_t result;
386
result = gpgme_op_decrypt_result(mc.ctx);
387
if(result == NULL){
388
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
283
result = gpgme_op_decrypt_result(mc->ctx);
284
if (result == NULL){
285
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
389
286
} else {
390
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
391
result->unsupported_algorithm);
392
fprintf_plus(stderr, "Wrong key usage: %u\n",
393
result->wrong_key_usage);
287
fprintf(stderr, "Unsupported algorithm: %s\n",
288
result->unsupported_algorithm);
289
fprintf(stderr, "Wrong key usage: %u\n",
290
result->wrong_key_usage);
394
291
if(result->file_name != NULL){
395
fprintf_plus(stderr, "File name: %s\n", result->file_name);
292
fprintf(stderr, "File name: %s\n", result->file_name);
396
293
}
397
294
gpgme_recipient_t recipient;
398
295
recipient = result->recipients;
399
while(recipient != NULL){
400
fprintf_plus(stderr, "Public key algorithm: %s\n",
401
gpgme_pubkey_algo_name
402
(recipient->pubkey_algo));
403
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
404
fprintf_plus(stderr, "Secret key available: %s\n",
405
recipient->status == GPG_ERR_NO_SECKEY
406
? "No" : "Yes");
407
recipient = recipient->next;
296
if(recipient){
297
while(recipient != NULL){
298
fprintf(stderr, "Public key algorithm: %s\n",
299
gpgme_pubkey_algo_name(recipient->pubkey_algo));
300
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
301
fprintf(stderr, "Secret key available: %s\n",
302
recipient->status == GPG_ERR_NO_SECKEY
303
? "No" : "Yes");
304
recipient = recipient->next;
305
}
408
306
}
409
307
}
410
308
}
412
310
}
413
311
414
312
if(debug){
415
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
313
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
416
314
}
417
315
418
316
/* Seek back to the beginning of the GPGME plaintext data buffer */
419
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
420
perror_plus("gpgme_data_seek");
317
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
318
perror("gpgme_data_seek");
421
319
plaintext_length = -1;
422
320
goto decrypt_end;
423
321
}
424
322
425
323
*plaintext = NULL;
426
324
while(true){
427
plaintext_capacity = incbuffer(plaintext,
428
(size_t)plaintext_length,
429
plaintext_capacity);
430
if(plaintext_capacity == 0){
431
perror_plus("incbuffer");
432
plaintext_length = -1;
433
goto decrypt_end;
325
plaintext_capacity = adjustbuffer(plaintext,
326
(size_t)plaintext_length,
327
plaintext_capacity);
328
if (plaintext_capacity == 0){
329
perror("adjustbuffer");
330
plaintext_length = -1;
331
goto decrypt_end;
434
332
}
435
333
436
334
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
437
335
BUFFER_SIZE);
438
336
/* Print the data, if any */
439
if(ret == 0){
337
if (ret == 0){
440
338
/* EOF */
441
339
break;
442
340
}
443
341
if(ret < 0){
444
perror_plus("gpgme_data_read");
342
perror("gpgme_data_read");
445
343
plaintext_length = -1;
446
344
goto decrypt_end;
447
345
}
449
347
}
450
348
451
349
if(debug){
452
fprintf_plus(stderr, "Decrypted password is: ");
350
fprintf(stderr, "Decrypted password is: ");
453
351
for(ssize_t i = 0; i < plaintext_length; i++){
454
352
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
455
353
}
466
364
return plaintext_length;
467
365
}
468
366
469
static const char * safer_gnutls_strerror(int value){
470
const char *ret = gnutls_strerror(value); /* Spurious warning from
471
-Wunreachable-code */
472
if(ret == NULL)
367
static const char * safer_gnutls_strerror (int value) {
368
const char *ret = gnutls_strerror (value); /* Spurious warning */
369
if (ret == NULL)
473
370
ret = "(unknown)";
474
371
return ret;
475
372
}
477
374
/* GnuTLS log function callback */
478
375
static void debuggnutls(__attribute__((unused)) int level,
479
376
const char* string){
480
fprintf_plus(stderr, "GnuTLS: %s", string);
377
fprintf(stderr, "GnuTLS: %s", string);
481
378
}
482
379
483
static int init_gnutls_global(const char *pubkeyfilename,
380
static int init_gnutls_global(mandos_context *mc,
381
const char *pubkeyfilename,
484
382
const char *seckeyfilename){
485
383
int ret;
486
384
487
385
if(debug){
488
fprintf_plus(stderr, "Initializing GnuTLS\n");
386
fprintf(stderr, "Initializing GnuTLS\n");
489
387
}
490
388
491
389
ret = gnutls_global_init();
492
if(ret != GNUTLS_E_SUCCESS){
493
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
494
safer_gnutls_strerror(ret));
390
if (ret != GNUTLS_E_SUCCESS) {
391
fprintf (stderr, "GnuTLS global_init: %s\n",
392
safer_gnutls_strerror(ret));
495
393
return -1;
496
394
}
497
395
498
if(debug){
396
if (debug){
499
397
/* "Use a log level over 10 to enable all debugging options."
500
398
* - GnuTLS manual
501
399
*/
504
402
}
505
403
506
404
/* OpenPGP credentials */
507
ret = gnutls_certificate_allocate_credentials(&mc.cred);
508
if(ret != GNUTLS_E_SUCCESS){
509
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
510
safer_gnutls_strerror(ret));
511
gnutls_global_deinit();
405
gnutls_certificate_allocate_credentials(&mc->cred);
406
if (ret != GNUTLS_E_SUCCESS){
407
fprintf (stderr, "GnuTLS memory error: %s\n", /* Spurious
408
warning */
409
safer_gnutls_strerror(ret));
410
gnutls_global_deinit ();
512
411
return -1;
513
412
}
514
413
515
414
if(debug){
516
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
517
" secret key %s as GnuTLS credentials\n",
518
pubkeyfilename,
519
seckeyfilename);
415
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
416
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
417
seckeyfilename);
520
418
}
521
419
522
420
ret = gnutls_certificate_set_openpgp_key_file
523
(mc.cred, pubkeyfilename, seckeyfilename,
421
(mc->cred, pubkeyfilename, seckeyfilename,
524
422
GNUTLS_OPENPGP_FMT_BASE64);
525
if(ret != GNUTLS_E_SUCCESS){
526
fprintf_plus(stderr,
527
"Error[%d] while reading the OpenPGP key pair ('%s',"
528
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
529
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
530
safer_gnutls_strerror(ret));
423
if (ret != GNUTLS_E_SUCCESS) {
424
fprintf(stderr,
425
"Error[%d] while reading the OpenPGP key pair ('%s',"
426
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
427
fprintf(stderr, "The GnuTLS error is: %s\n",
428
safer_gnutls_strerror(ret));
531
429
goto globalfail;
532
430
}
533
431
534
432
/* GnuTLS server initialization */
535
ret = gnutls_dh_params_init(&mc.dh_params);
536
if(ret != GNUTLS_E_SUCCESS){
537
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
538
" initialization: %s\n",
539
safer_gnutls_strerror(ret));
433
ret = gnutls_dh_params_init(&mc->dh_params);
434
if (ret != GNUTLS_E_SUCCESS) {
435
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
436
" %s\n", safer_gnutls_strerror(ret));
540
437
goto globalfail;
541
438
}
542
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
543
if(ret != GNUTLS_E_SUCCESS){
544
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
545
safer_gnutls_strerror(ret));
439
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
440
if (ret != GNUTLS_E_SUCCESS) {
441
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
442
safer_gnutls_strerror(ret));
546
443
goto globalfail;
547
444
}
548
445
549
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
446
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
550
447
551
448
return 0;
552
449
553
450
globalfail:
554
451
555
gnutls_certificate_free_credentials(mc.cred);
452
gnutls_certificate_free_credentials(mc->cred);
556
453
gnutls_global_deinit();
557
gnutls_dh_params_deinit(mc.dh_params);
454
gnutls_dh_params_deinit(mc->dh_params);
558
455
return -1;
559
456
}
560
457
561
static int init_gnutls_session(gnutls_session_t *session){
458
static int init_gnutls_session(mandos_context *mc,
459
gnutls_session_t *session){
562
460
int ret;
563
461
/* GnuTLS session creation */
564
do {
565
ret = gnutls_init(session, GNUTLS_SERVER);
566
if(quit_now){
567
return -1;
568
}
569
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
570
if(ret != GNUTLS_E_SUCCESS){
571
fprintf_plus(stderr,
572
"Error in GnuTLS session initialization: %s\n",
573
safer_gnutls_strerror(ret));
462
ret = gnutls_init(session, GNUTLS_SERVER);
463
if (ret != GNUTLS_E_SUCCESS){
464
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
465
safer_gnutls_strerror(ret));
574
466
}
575
467
576
468
{
577
469
const char *err;
578
do {
579
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
580
if(quit_now){
581
gnutls_deinit(*session);
582
return -1;
583
}
584
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
585
if(ret != GNUTLS_E_SUCCESS){
586
fprintf_plus(stderr, "Syntax error at: %s\n", err);
587
fprintf_plus(stderr, "GnuTLS error: %s\n",
588
safer_gnutls_strerror(ret));
589
gnutls_deinit(*session);
470
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
471
if (ret != GNUTLS_E_SUCCESS) {
472
fprintf(stderr, "Syntax error at: %s\n", err);
473
fprintf(stderr, "GnuTLS error: %s\n",
474
safer_gnutls_strerror(ret));
475
gnutls_deinit (*session);
590
476
return -1;
591
477
}
592
478
}
593
479
594
do {
595
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
596
mc.cred);
597
if(quit_now){
598
gnutls_deinit(*session);
599
return -1;
600
}
601
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
602
if(ret != GNUTLS_E_SUCCESS){
603
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
604
safer_gnutls_strerror(ret));
605
gnutls_deinit(*session);
480
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
481
mc->cred);
482
if (ret != GNUTLS_E_SUCCESS) {
483
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
484
safer_gnutls_strerror(ret));
485
gnutls_deinit (*session);
606
486
return -1;
607
487
}
608
488
609
489
/* ignore client certificate if any. */
610
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
490
gnutls_certificate_server_set_request (*session,
491
GNUTLS_CERT_IGNORE);
611
492
612
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
493
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
613
494
614
495
return 0;
615
496
}
621
502
/* Called when a Mandos server is found */
622
503
static int start_mandos_communication(const char *ip, uint16_t port,
623
504
AvahiIfIndex if_index,
624
int af){
625
int ret, tcp_sd = -1;
626
ssize_t sret;
627
union {
628
struct sockaddr_in in;
629
struct sockaddr_in6 in6;
630
} to;
505
mandos_context *mc){
506
int ret, tcp_sd;
507
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
631
508
char *buffer = NULL;
632
char *decrypted_buffer = NULL;
509
char *decrypted_buffer;
633
510
size_t buffer_length = 0;
634
511
size_t buffer_capacity = 0;
512
ssize_t decrypted_buffer_size;
635
513
size_t written;
636
int retval = -1;
514
int retval = 0;
515
char interface[IF_NAMESIZE];
637
516
gnutls_session_t session;
638
int pf; /* Protocol family */
639
640
errno = 0;
641
642
if(quit_now){
643
errno = EINTR;
644
return -1;
645
}
646
647
switch(af){
648
case AF_INET6:
649
pf = PF_INET6;
650
break;
651
case AF_INET:
652
pf = PF_INET;
653
break;
654
default:
655
fprintf_plus(stderr, "Bad address family: %d\n", af);
656
errno = EINVAL;
657
return -1;
658
}
659
660
ret = init_gnutls_session(&session);
661
if(ret != 0){
662
return -1;
663
}
664
665
if(debug){
666
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
667
PRIu16 "\n", ip, port);
668
}
669
670
tcp_sd = socket(pf, SOCK_STREAM, 0);
671
if(tcp_sd < 0){
672
int e = errno;
673
perror_plus("socket");
674
errno = e;
675
goto mandos_end;
676
}
677
678
if(quit_now){
679
errno = EINTR;
680
goto mandos_end;
517
518
ret = init_gnutls_session (mc, &session);
519
if (ret != 0){
520
return -1;
521
}
522
523
if(debug){
524
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
525
"\n", ip, port);
526
}
527
528
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
529
if(tcp_sd < 0) {
530
perror("socket");
531
return -1;
532
}
533
534
if(debug){
535
if(if_indextoname((unsigned int)if_index, interface) == NULL){
536
perror("if_indextoname");
537
return -1;
538
}
539
fprintf(stderr, "Binding to interface %s\n", interface);
681
540
}
682
541
683
542
memset(&to, 0, sizeof(to));
684
if(af == AF_INET6){
685
to.in6.sin6_family = (sa_family_t)af;
686
ret = inet_pton(af, ip, &to.in6.sin6_addr);
687
} else { /* IPv4 */
688
to.in.sin_family = (sa_family_t)af;
689
ret = inet_pton(af, ip, &to.in.sin_addr);
690
}
691
if(ret < 0 ){
692
int e = errno;
693
perror_plus("inet_pton");
694
errno = e;
695
goto mandos_end;
543
to.in6.sin6_family = AF_INET6;
544
/* It would be nice to have a way to detect if we were passed an
545
IPv4 address here. Now we assume an IPv6 address. */
546
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
547
if (ret < 0 ){
548
perror("inet_pton");
549
return -1;
696
550
}
697
551
if(ret == 0){
698
int e = errno;
699
fprintf_plus(stderr, "Bad address: %s\n", ip);
700
errno = e;
701
goto mandos_end;
702
}
703
if(af == AF_INET6){
704
to.in6.sin6_port = htons(port); /* Spurious warnings from
705
-Wconversion and
706
-Wunreachable-code */
707
708
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
709
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
710
-Wunreachable-code*/
711
if(if_index == AVAHI_IF_UNSPEC){
712
fprintf_plus(stderr, "An IPv6 link-local address is"
713
" incomplete without a network interface\n");
714
errno = EINVAL;
715
goto mandos_end;
716
}
717
/* Set the network interface number as scope */
718
to.in6.sin6_scope_id = (uint32_t)if_index;
719
}
720
} else {
721
to.in.sin_port = htons(port); /* Spurious warnings from
722
-Wconversion and
723
-Wunreachable-code */
724
}
552
fprintf(stderr, "Bad address: %s\n", ip);
553
return -1;
554
}
555
to.in6.sin6_port = htons(port); /* Spurious warning */
725
556
726
if(quit_now){
727
errno = EINTR;
728
goto mandos_end;
729
}
557
to.in6.sin6_scope_id = (uint32_t)if_index;
730
558
731
559
if(debug){
732
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
733
char interface[IF_NAMESIZE];
734
if(if_indextoname((unsigned int)if_index, interface) == NULL){
735
perror_plus("if_indextoname");
736
} else {
737
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
738
"\n", ip, interface, port);
739
}
740
} else {
741
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
742
ip, port);
743
}
744
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
745
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
746
const char *pcret;
747
if(af == AF_INET6){
748
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
749
sizeof(addrstr));
750
} else {
751
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
752
sizeof(addrstr));
753
}
754
if(pcret == NULL){
755
perror_plus("inet_ntop");
560
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
561
port);
562
char addrstr[INET6_ADDRSTRLEN] = "";
563
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
564
sizeof(addrstr)) == NULL){
565
perror("inet_ntop");
756
566
} else {
757
567
if(strcmp(addrstr, ip) != 0){
758
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
568
fprintf(stderr, "Canonical address form: %s\n", addrstr);
759
569
}
760
570
}
761
571
}
762
572
763
if(quit_now){
764
errno = EINTR;
765
goto mandos_end;
766
}
767
768
if(af == AF_INET6){
769
ret = connect(tcp_sd, &to.in6, sizeof(to));
770
} else {
771
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
772
}
773
if(ret < 0){
774
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
775
int e = errno;
776
perror_plus("connect");
777
errno = e;
778
}
779
goto mandos_end;
780
}
781
782
if(quit_now){
783
errno = EINTR;
784
goto mandos_end;
573
ret = connect(tcp_sd, &to.in, sizeof(to));
574
if (ret < 0){
575
perror("connect");
576
return -1;
785
577
}
786
578
787
579
const char *out = mandos_protocol_version;
788
580
written = 0;
789
while(true){
581
while (true){
790
582
size_t out_size = strlen(out);
791
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
792
out_size - written));
793
if(ret == -1){
794
int e = errno;
795
perror_plus("write");
796
errno = e;
583
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
584
out_size - written));
585
if (ret == -1){
586
perror("write");
587
retval = -1;
797
588
goto mandos_end;
798
589
}
799
590
written += (size_t)ret;
800
591
if(written < out_size){
801
592
continue;
802
593
} else {
803
if(out == mandos_protocol_version){
594
if (out == mandos_protocol_version){
804
595
written = 0;
805
596
out = "\r\n";
806
597
} else {
807
598
break;
808
599
}
809
600
}
810
811
if(quit_now){
812
errno = EINTR;
813
goto mandos_end;
814
}
815
601
}
816
602
817
603
if(debug){
818
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
819
}
820
821
if(quit_now){
822
errno = EINTR;
823
goto mandos_end;
824
}
825
826
/* This casting via intptr_t is to eliminate warning about casting
827
an int to a pointer type. This is exactly how the GnuTLS Guile
828
function "set-session-transport-fd!" does it. */
829
gnutls_transport_set_ptr(session,
830
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
831
832
if(quit_now){
833
errno = EINTR;
834
goto mandos_end;
835
}
836
837
do {
838
ret = gnutls_handshake(session);
839
if(quit_now){
840
errno = EINTR;
841
goto mandos_end;
842
}
604
fprintf(stderr, "Establishing TLS session with %s\n", ip);
605
}
606
607
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
608
609
do{
610
ret = gnutls_handshake (session);
843
611
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
844
612
845
if(ret != GNUTLS_E_SUCCESS){
613
if (ret != GNUTLS_E_SUCCESS){
846
614
if(debug){
847
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
848
gnutls_perror(ret);
615
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
616
gnutls_perror (ret);
849
617
}
850
errno = EPROTO;
618
retval = -1;
851
619
goto mandos_end;
852
620
}
853
621
854
622
/* Read OpenPGP packet that contains the wanted password */
855
623
856
624
if(debug){
857
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
858
" %s\n", ip);
625
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
626
ip);
859
627
}
860
628
861
629
while(true){
862
863
if(quit_now){
864
errno = EINTR;
865
goto mandos_end;
866
}
867
868
buffer_capacity = incbuffer(&buffer, buffer_length,
869
buffer_capacity);
870
if(buffer_capacity == 0){
871
int e = errno;
872
perror_plus("incbuffer");
873
errno = e;
874
goto mandos_end;
875
}
876
877
if(quit_now){
878
errno = EINTR;
879
goto mandos_end;
880
}
881
882
sret = gnutls_record_recv(session, buffer+buffer_length,
883
BUFFER_SIZE);
884
if(sret == 0){
630
buffer_capacity = adjustbuffer(&buffer, buffer_length,
631
buffer_capacity);
632
if (buffer_capacity == 0){
633
perror("adjustbuffer");
634
retval = -1;
635
goto mandos_end;
636
}
637
638
ret = gnutls_record_recv(session, buffer+buffer_length,
639
BUFFER_SIZE);
640
if (ret == 0){
885
641
break;
886
642
}
887
if(sret < 0){
888
switch(sret){
643
if (ret < 0){
644
switch(ret){
889
645
case GNUTLS_E_INTERRUPTED:
890
646
case GNUTLS_E_AGAIN:
891
647
break;
892
648
case GNUTLS_E_REHANDSHAKE:
893
do {
894
ret = gnutls_handshake(session);
895
896
if(quit_now){
897
errno = EINTR;
898
goto mandos_end;
899
}
649
do{
650
ret = gnutls_handshake (session);
900
651
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
901
if(ret < 0){
902
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
903
"***\n");
904
gnutls_perror(ret);
905
errno = EPROTO;
652
if (ret < 0){
653
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
654
gnutls_perror (ret);
655
retval = -1;
906
656
goto mandos_end;
907
657
}
908
658
break;
909
659
default:
910
fprintf_plus(stderr, "Unknown error while reading data from"
911
" encrypted session with Mandos server\n");
912
gnutls_bye(session, GNUTLS_SHUT_RDWR);
913
errno = EIO;
660
fprintf(stderr, "Unknown error while reading data from"
661
" encrypted session with Mandos server\n");
662
retval = -1;
663
gnutls_bye (session, GNUTLS_SHUT_RDWR);
914
664
goto mandos_end;
915
665
}
916
666
} else {
917
buffer_length += (size_t) sret;
667
buffer_length += (size_t) ret;
918
668
}
919
669
}
920
670
921
671
if(debug){
922
fprintf_plus(stderr, "Closing TLS session\n");
923
}
924
925
if(quit_now){
926
errno = EINTR;
927
goto mandos_end;
928
}
929
930
do {
931
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
932
if(quit_now){
933
errno = EINTR;
934
goto mandos_end;
935
}
936
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
937
938
if(buffer_length > 0){
939
ssize_t decrypted_buffer_size;
940
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
672
fprintf(stderr, "Closing TLS session\n");
673
}
674
675
gnutls_bye (session, GNUTLS_SHUT_RDWR);
676
677
if (buffer_length > 0){
678
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
679
buffer_length,
941
680
&decrypted_buffer);
942
if(decrypted_buffer_size >= 0){
943
681
if (decrypted_buffer_size >= 0){
944
682
written = 0;
945
683
while(written < (size_t) decrypted_buffer_size){
946
if(quit_now){
947
errno = EINTR;
948
goto mandos_end;
949
}
950
951
ret = (int)fwrite(decrypted_buffer + written, 1,
952
(size_t)decrypted_buffer_size - written,
953
stdout);
684
ret = (int)fwrite (decrypted_buffer + written, 1,
685
(size_t)decrypted_buffer_size - written,
686
stdout);
954
687
if(ret == 0 and ferror(stdout)){
955
int e = errno;
956
688
if(debug){
957
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
958
strerror(errno));
689
fprintf(stderr, "Error writing encrypted data: %s\n",
690
strerror(errno));
959
691
}
960
errno = e;
961
goto mandos_end;
692
retval = -1;
693
break;
962
694
}
963
695
written += (size_t)ret;
964
696
}
965
retval = 0;
697
free(decrypted_buffer);
698
} else {
699
retval = -1;
966
700
}
701
} else {
702
retval = -1;
967
703
}
968
704
969
705
/* Shutdown procedure */
970
706
971
707
mandos_end:
972
{
973
int e = errno;
974
free(decrypted_buffer);
975
free(buffer);
976
if(tcp_sd >= 0){
977
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
978
}
979
if(ret == -1){
980
if(e == 0){
981
e = errno;
982
}
983
perror_plus("close");
984
}
985
gnutls_deinit(session);
986
errno = e;
987
if(quit_now){
988
errno = EINTR;
989
retval = -1;
990
}
708
free(buffer);
709
ret = TEMP_FAILURE_RETRY(close(tcp_sd));
710
if(ret == -1){
711
perror("close");
991
712
}
713
gnutls_deinit (session);
992
714
return retval;
993
715
}
994
716
995
717
static void resolve_callback(AvahiSServiceResolver *r,
996
718
AvahiIfIndex interface,
997
AvahiProtocol proto,
719
AVAHI_GCC_UNUSED AvahiProtocol protocol,
998
720
AvahiResolverEvent event,
999
721
const char *name,
1000
722
const char *type,
1005
727
AVAHI_GCC_UNUSED AvahiStringList *txt,
1006
728
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1007
729
flags,
1008
AVAHI_GCC_UNUSED void* userdata){
730
void* userdata) {
731
mandos_context *mc = userdata;
1009
732
assert(r);
1010
733
1011
734
/* Called whenever a service has been resolved successfully or
1012
735
timed out */
1013
736
1014
if(quit_now){
1015
return;
1016
}
1017
1018
switch(event){
737
switch (event) {
1019
738
default:
1020
739
case AVAHI_RESOLVER_FAILURE:
1021
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1022
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1023
domain,
1024
avahi_strerror(avahi_server_errno(mc.server)));
740
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
741
" of type '%s' in domain '%s': %s\n", name, type, domain,
742
avahi_strerror(avahi_server_errno(mc->server)));
1025
743
break;
1026
744
1027
745
case AVAHI_RESOLVER_FOUND:
1029
747
char ip[AVAHI_ADDRESS_STR_MAX];
1030
748
avahi_address_snprint(ip, sizeof(ip), address);
1031
749
if(debug){
1032
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1033
PRIdMAX ") on port %" PRIu16 "\n", name,
1034
host_name, ip, (intmax_t)interface, port);
750
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
751
PRIu16 ") on port %d\n", name, host_name, ip,
752
interface, port);
1035
753
}
1036
int ret = start_mandos_communication(ip, port, interface,
1037
avahi_proto_to_af(proto));
1038
if(ret == 0){
1039
avahi_simple_poll_quit(mc.simple_poll);
1040
} else {
1041
if(not add_server(ip, port, interface,
1042
avahi_proto_to_af(proto))){
1043
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1044
" list\n", name);
1045
}
754
int ret = start_mandos_communication(ip, port, interface, mc);
755
if (ret == 0){
756
avahi_simple_poll_quit(mc->simple_poll);
1046
757
}
1047
758
}
1048
759
}
1049
760
avahi_s_service_resolver_free(r);
1050
761
}
1051
762
1052
static void browse_callback(AvahiSServiceBrowser *b,
1053
AvahiIfIndex interface,
1054
AvahiProtocol protocol,
1055
AvahiBrowserEvent event,
1056
const char *name,
1057
const char *type,
1058
const char *domain,
1059
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1060
flags,
1061
AVAHI_GCC_UNUSED void* userdata){
763
static void browse_callback( AvahiSServiceBrowser *b,
764
AvahiIfIndex interface,
765
AvahiProtocol protocol,
766
AvahiBrowserEvent event,
767
const char *name,
768
const char *type,
769
const char *domain,
770
AVAHI_GCC_UNUSED AvahiLookupResultFlags
771
flags,
772
void* userdata) {
773
mandos_context *mc = userdata;
1062
774
assert(b);
1063
775
1064
776
/* Called whenever a new services becomes available on the LAN or
1065
777
is removed from the LAN */
1066
778
1067
if(quit_now){
1068
return;
1069
}
1070
1071
switch(event){
779
switch (event) {
1072
780
default:
1073
781
case AVAHI_BROWSER_FAILURE:
1074
782
1075
fprintf_plus(stderr, "(Avahi browser) %s\n",
1076
avahi_strerror(avahi_server_errno(mc.server)));
1077
avahi_simple_poll_quit(mc.simple_poll);
783
fprintf(stderr, "(Avahi browser) %s\n",
784
avahi_strerror(avahi_server_errno(mc->server)));
785
avahi_simple_poll_quit(mc->simple_poll);
1078
786
return;
1079
787
1080
788
case AVAHI_BROWSER_NEW:
1083
791
the callback function is called the Avahi server will free the
1084
792
resolver for us. */
1085
793
1086
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1087
name, type, domain, protocol, 0,
1088
resolve_callback, NULL) == NULL)
1089
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1090
" %s\n", name,
1091
avahi_strerror(avahi_server_errno(mc.server)));
794
if (!(avahi_s_service_resolver_new(mc->server, interface,
795
protocol, name, type, domain,
796
AVAHI_PROTO_INET6, 0,
797
resolve_callback, mc)))
798
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
799
name, avahi_strerror(avahi_server_errno(mc->server)));
1092
800
break;
1093
801
1094
802
case AVAHI_BROWSER_REMOVE:
1097
805
case AVAHI_BROWSER_ALL_FOR_NOW:
1098
806
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1099
807
if(debug){
1100
fprintf_plus(stderr, "No Mandos server found, still"
1101
" searching...\n");
808
fprintf(stderr, "No Mandos server found, still searching...\n");
1102
809
}
1103
810
break;
1104
811
}
1105
812
}
1106
813
1107
/* Signal handler that stops main loop after SIGTERM */
1108
static void handle_sigterm(int sig){
1109
if(quit_now){
1110
return;
1111
}
1112
quit_now = 1;
1113
signal_received = sig;
1114
int old_errno = errno;
1115
/* set main loop to exit */
1116
if(mc.simple_poll != NULL){
1117
avahi_simple_poll_quit(mc.simple_poll);
1118
}
1119
errno = old_errno;
1120
}
1121
1122
bool get_flags(const char *ifname, struct ifreq *ifr){
1123
int ret;
1124
1125
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1126
if(s < 0){
1127
perror_plus("socket");
1128
return false;
1129
}
1130
strcpy(ifr->ifr_name, ifname);
1131
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1132
if(ret == -1){
1133
if(debug){
1134
perror_plus("ioctl SIOCGIFFLAGS");
1135
}
1136
return false;
1137
}
1138
return true;
1139
}
1140
1141
bool good_flags(const char *ifname, const struct ifreq *ifr){
1142
1143
/* Reject the loopback device */
1144
if(ifr->ifr_flags & IFF_LOOPBACK){
1145
if(debug){
1146
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1147
ifname);
1148
}
1149
return false;
1150
}
1151
/* Accept point-to-point devices only if connect_to is specified */
1152
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1153
if(debug){
1154
fprintf_plus(stderr, "Accepting point-to-point interface"
1155
" \"%s\"\n", ifname);
1156
}
1157
return true;
1158
}
1159
/* Otherwise, reject non-broadcast-capable devices */
1160
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1161
if(debug){
1162
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1163
" \"%s\"\n", ifname);
1164
}
1165
return false;
1166
}
1167
/* Reject non-ARP interfaces (including dummy interfaces) */
1168
if(ifr->ifr_flags & IFF_NOARP){
1169
if(debug){
1170
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1171
ifname);
1172
}
1173
return false;
1174
}
1175
1176
/* Accept this device */
1177
if(debug){
1178
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1179
}
1180
return true;
1181
}
1182
1183
/*
1184
* This function determines if a directory entry in /sys/class/net
1185
* corresponds to an acceptable network device.
1186
* (This function is passed to scandir(3) as a filter function.)
1187
*/
1188
int good_interface(const struct dirent *if_entry){
1189
if(if_entry->d_name[0] == '.'){
1190
return 0;
1191
}
1192
1193
struct ifreq ifr;
1194
if(not get_flags(if_entry->d_name, &ifr)){
1195
if(debug){
1196
fprintf_plus(stderr, "Failed to get flags for interface "
1197
"\"%s\"\n", if_entry->d_name);
1198
}
1199
return 0;
1200
}
1201
1202
if(not good_flags(if_entry->d_name, &ifr)){
1203
return 0;
1204
}
1205
return 1;
1206
}
1207
1208
/*
1209
* This function determines if a directory entry in /sys/class/net
1210
* corresponds to an acceptable network device which is up.
1211
* (This function is passed to scandir(3) as a filter function.)
1212
*/
1213
int up_interface(const struct dirent *if_entry){
1214
if(if_entry->d_name[0] == '.'){
1215
return 0;
1216
}
1217
1218
struct ifreq ifr;
1219
if(not get_flags(if_entry->d_name, &ifr)){
1220
if(debug){
1221
fprintf_plus(stderr, "Failed to get flags for interface "
1222
"\"%s\"\n", if_entry->d_name);
1223
}
1224
return 0;
1225
}
1226
1227
/* Reject down interfaces */
1228
if(not (ifr.ifr_flags & IFF_UP)){
1229
if(debug){
1230
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1231
if_entry->d_name);
1232
}
1233
return 0;
1234
}
1235
1236
/* Reject non-running interfaces */
1237
if(not (ifr.ifr_flags & IFF_RUNNING)){
1238
if(debug){
1239
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1240
if_entry->d_name);
1241
}
1242
return 0;
1243
}
1244
1245
if(not good_flags(if_entry->d_name, &ifr)){
1246
return 0;
1247
}
1248
return 1;
1249
}
1250
1251
int notdotentries(const struct dirent *direntry){
1252
/* Skip "." and ".." */
1253
if(direntry->d_name[0] == '.'
1254
and (direntry->d_name[1] == '\0'
1255
or (direntry->d_name[1] == '.'
1256
and direntry->d_name[2] == '\0'))){
1257
return 0;
1258
}
1259
return 1;
1260
}
1261
1262
/* Is this directory entry a runnable program? */
1263
int runnable_hook(const struct dirent *direntry){
1264
int ret;
1265
size_t sret;
1266
struct stat st;
1267
1268
if((direntry->d_name)[0] == '\0'){
1269
/* Empty name? */
1270
return 0;
1271
}
1272
1273
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1274
"abcdefghijklmnopqrstuvwxyz"
1275
"0123456789"
1276
"_-");
1277
if((direntry->d_name)[sret] != '\0'){
1278
/* Contains non-allowed characters */
1279
if(debug){
1280
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1281
direntry->d_name);
1282
}
1283
return 0;
1284
}
1285
1286
char *fullname = NULL;
1287
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1288
if(ret < 0){
1289
perror_plus("asprintf");
1290
return 0;
1291
}
1292
1293
ret = stat(fullname, &st);
1294
if(ret == -1){
1295
if(debug){
1296
perror_plus("Could not stat hook");
1297
}
1298
return 0;
1299
}
1300
if(not (S_ISREG(st.st_mode))){
1301
/* Not a regular file */
1302
if(debug){
1303
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1304
direntry->d_name);
1305
}
1306
return 0;
1307
}
1308
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1309
/* Not executable */
1310
if(debug){
1311
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1312
direntry->d_name);
1313
}
1314
return 0;
1315
}
1316
if(debug){
1317
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1318
direntry->d_name);
1319
}
1320
return 1;
1321
}
1322
1323
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1324
int ret;
1325
struct timespec now;
1326
struct timespec waited_time;
1327
intmax_t block_time;
1328
1329
while(true){
1330
if(mc.current_server == NULL){
1331
if (debug){
1332
fprintf_plus(stderr, "Wait until first server is found."
1333
" No timeout!\n");
1334
}
1335
ret = avahi_simple_poll_iterate(s, -1);
1336
} else {
1337
if (debug){
1338
fprintf_plus(stderr, "Check current_server if we should run"
1339
" it, or wait\n");
1340
}
1341
/* the current time */
1342
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1343
if(ret == -1){
1344
perror_plus("clock_gettime");
1345
return -1;
1346
}
1347
/* Calculating in ms how long time between now and server
1348
who we visted longest time ago. Now - last seen. */
1349
waited_time.tv_sec = (now.tv_sec
1350
- mc.current_server->last_seen.tv_sec);
1351
waited_time.tv_nsec = (now.tv_nsec
1352
- mc.current_server->last_seen.tv_nsec);
1353
/* total time is 10s/10,000ms.
1354
Converting to s from ms by dividing by 1,000,
1355
and ns to ms by dividing by 1,000,000. */
1356
block_time = ((retry_interval
1357
- ((intmax_t)waited_time.tv_sec * 1000))
1358
- ((intmax_t)waited_time.tv_nsec / 1000000));
1359
1360
if (debug){
1361
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1362
block_time);
1363
}
1364
1365
if(block_time <= 0){
1366
ret = start_mandos_communication(mc.current_server->ip,
1367
mc.current_server->port,
1368
mc.current_server->if_index,
1369
mc.current_server->af);
1370
if(ret == 0){
1371
avahi_simple_poll_quit(mc.simple_poll);
1372
return 0;
1373
}
1374
ret = clock_gettime(CLOCK_MONOTONIC,
1375
&mc.current_server->last_seen);
1376
if(ret == -1){
1377
perror_plus("clock_gettime");
1378
return -1;
1379
}
1380
mc.current_server = mc.current_server->next;
1381
block_time = 0; /* Call avahi to find new Mandos
1382
servers, but don't block */
1383
}
1384
1385
ret = avahi_simple_poll_iterate(s, (int)block_time);
1386
}
1387
if(ret != 0){
1388
if (ret > 0 or errno != EINTR){
1389
return (ret != 1) ? ret : 0;
1390
}
1391
}
1392
}
1393
}
1394
1395
/* Set effective uid to 0, return errno */
1396
int raise_privileges(void){
1397
int old_errno = errno;
1398
int ret_errno = 0;
1399
errno = 0;
1400
if(seteuid(0) == -1){
1401
perror_plus("seteuid");
1402
}
1403
ret_errno = errno;
1404
errno = old_errno;
1405
return ret_errno;
1406
}
1407
1408
/* Set effective and real user ID to 0. Return errno. */
1409
int raise_privileges_permanently(void){
1410
int old_errno = errno;
1411
int ret_errno = raise_privileges();
1412
if(ret_errno != 0){
1413
errno = old_errno;
1414
return ret_errno;
1415
}
1416
errno = 0;
1417
if(setuid(0) == -1){
1418
perror_plus("seteuid");
1419
}
1420
ret_errno = errno;
1421
errno = old_errno;
1422
return ret_errno;
1423
}
1424
1425
/* Set effective user ID to unprivileged saved user ID */
1426
int lower_privileges(void){
1427
int old_errno = errno;
1428
int ret_errno = 0;
1429
errno = 0;
1430
if(seteuid(uid) == -1){
1431
perror_plus("seteuid");
1432
}
1433
ret_errno = errno;
1434
errno = old_errno;
1435
return ret_errno;
1436
}
1437
1438
bool run_network_hooks(const char *mode, const char *interface,
1439
const float delay){
1440
struct dirent **direntries;
1441
struct dirent *direntry;
1442
int ret;
1443
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1444
alphasort);
1445
if(numhooks == -1){
1446
perror_plus("scandir");
1447
} else {
1448
int devnull = open("/dev/null", O_RDONLY);
1449
for(int i = 0; i < numhooks; i++){
1450
direntry = direntries[i];
1451
char *fullname = NULL;
1452
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1453
if(ret < 0){
1454
perror_plus("asprintf");
1455
continue;
1456
}
1457
if(debug){
1458
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1459
direntry->d_name);
1460
}
1461
pid_t hook_pid = fork();
1462
if(hook_pid == 0){
1463
/* Child */
1464
/* Raise privileges */
1465
raise_privileges_permanently();
1466
/* Set group */
1467
errno = 0;
1468
ret = setgid(0);
1469
if(ret == -1){
1470
perror_plus("setgid");
1471
}
1472
/* Reset supplementary groups */
1473
errno = 0;
1474
ret = setgroups(0, NULL);
1475
if(ret == -1){
1476
perror_plus("setgroups");
1477
}
1478
dup2(devnull, STDIN_FILENO);
1479
close(devnull);
1480
dup2(STDERR_FILENO, STDOUT_FILENO);
1481
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1482
if(ret == -1){
1483
perror_plus("setenv");
1484
_exit(EX_OSERR);
1485
}
1486
ret = setenv("DEVICE", interface, 1);
1487
if(ret == -1){
1488
perror_plus("setenv");
1489
_exit(EX_OSERR);
1490
}
1491
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1492
if(ret == -1){
1493
perror_plus("setenv");
1494
_exit(EX_OSERR);
1495
}
1496
ret = setenv("MODE", mode, 1);
1497
if(ret == -1){
1498
perror_plus("setenv");
1499
_exit(EX_OSERR);
1500
}
1501
char *delaystring;
1502
ret = asprintf(&delaystring, "%f", delay);
1503
if(ret == -1){
1504
perror_plus("asprintf");
1505
_exit(EX_OSERR);
1506
}
1507
ret = setenv("DELAY", delaystring, 1);
1508
if(ret == -1){
1509
free(delaystring);
1510
perror_plus("setenv");
1511
_exit(EX_OSERR);
1512
}
1513
free(delaystring);
1514
if(connect_to != NULL){
1515
ret = setenv("CONNECT", connect_to, 1);
1516
if(ret == -1){
1517
perror_plus("setenv");
1518
_exit(EX_OSERR);
1519
}
1520
}
1521
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1522
perror_plus("execl");
1523
_exit(EXIT_FAILURE);
1524
}
1525
} else {
1526
int status;
1527
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1528
perror_plus("waitpid");
1529
free(fullname);
1530
continue;
1531
}
1532
if(WIFEXITED(status)){
1533
if(WEXITSTATUS(status) != 0){
1534
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1535
" with status %d\n", direntry->d_name,
1536
WEXITSTATUS(status));
1537
free(fullname);
1538
continue;
1539
}
1540
} else if(WIFSIGNALED(status)){
1541
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1542
" signal %d\n", direntry->d_name,
1543
WTERMSIG(status));
1544
free(fullname);
1545
continue;
1546
} else {
1547
fprintf_plus(stderr, "Warning: network hook \"%s\""
1548
" crashed\n", direntry->d_name);
1549
free(fullname);
1550
continue;
1551
}
1552
}
1553
free(fullname);
1554
if(debug){
1555
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1556
direntry->d_name);
1557
}
1558
}
1559
close(devnull);
1560
}
1561
return true;
1562
}
1563
1564
int bring_up_interface(const char * const interface, const float delay){
1565
int sd = -1;
1566
int old_errno = errno;
1567
int ret_errno = 0;
1568
int ret;
1569
struct ifreq network;
1570
AvahiIfIndex if_index = (AvahiIfIndex)if_nametoindex(interface);
1571
if(if_index == 0){
1572
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1573
errno = old_errno;
1574
return ENXIO;
1575
}
1576
1577
if(quit_now){
1578
errno = old_errno;
1579
return EINTR;
1580
}
1581
1582
/* Re-raise priviliges */
1583
raise_privileges();
1584
1585
#ifdef __linux__
1586
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1587
messages about the network interface to mess up the prompt */
1588
ret = klogctl(8, NULL, 5);
1589
bool restore_loglevel = true;
1590
if(ret == -1){
1591
restore_loglevel = false;
1592
perror_plus("klogctl");
1593
}
1594
#endif /* __linux__ */
1595
1596
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1597
if(sd < 0){
1598
ret_errno = errno;
1599
perror_plus("socket");
1600
#ifdef __linux__
1601
if(restore_loglevel){
1602
ret = klogctl(7, NULL, 0);
1603
if(ret == -1){
1604
perror_plus("klogctl");
1605
}
1606
}
1607
#endif /* __linux__ */
1608
/* Lower privileges */
1609
lower_privileges();
1610
errno = old_errno;
1611
return ret_errno;
1612
}
1613
strcpy(network.ifr_name, interface);
1614
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1615
if(ret == -1){
1616
ret_errno = errno;
1617
perror_plus("ioctl SIOCGIFFLAGS");
1618
#ifdef __linux__
1619
if(restore_loglevel){
1620
ret = klogctl(7, NULL, 0);
1621
if(ret == -1){
1622
perror_plus("klogctl");
1623
}
1624
}
1625
#endif /* __linux__ */
1626
/* Lower privileges */
1627
lower_privileges();
1628
errno = old_errno;
1629
return ret_errno;
1630
}
1631
if((network.ifr_flags & IFF_UP) == 0){
1632
network.ifr_flags |= IFF_UP;
1633
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1634
if(ret == -1){
1635
ret_errno = errno;
1636
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1637
#ifdef __linux__
1638
if(restore_loglevel){
1639
ret = klogctl(7, NULL, 0);
1640
if(ret == -1){
1641
perror_plus("klogctl");
1642
}
1643
}
1644
#endif /* __linux__ */
1645
/* Lower privileges */
1646
lower_privileges();
1647
errno = old_errno;
1648
return ret_errno;
1649
}
1650
}
1651
/* Sleep checking until interface is running.
1652
Check every 0.25s, up to total time of delay */
1653
for(int i=0; i < delay * 4; i++){
1654
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1655
if(ret == -1){
1656
perror_plus("ioctl SIOCGIFFLAGS");
1657
} else if(network.ifr_flags & IFF_RUNNING){
1658
break;
1659
}
1660
struct timespec sleeptime = { .tv_nsec = 250000000 };
1661
ret = nanosleep(&sleeptime, NULL);
1662
if(ret == -1 and errno != EINTR){
1663
perror_plus("nanosleep");
1664
}
1665
}
1666
/* Close the socket */
1667
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1668
if(ret == -1){
1669
perror_plus("close");
1670
}
1671
#ifdef __linux__
1672
if(restore_loglevel){
1673
/* Restores kernel loglevel to default */
1674
ret = klogctl(7, NULL, 0);
1675
if(ret == -1){
1676
perror_plus("klogctl");
1677
}
1678
}
1679
#endif /* __linux__ */
1680
/* Lower privileges */
1681
lower_privileges();
1682
errno = old_errno;
1683
return 0;
1684
}
1685
1686
814
int main(int argc, char *argv[]){
1687
AvahiSServiceBrowser *sb = NULL;
1688
int error;
1689
int ret;
1690
intmax_t tmpmax;
1691
char *tmp;
1692
int exitcode = EXIT_SUCCESS;
1693
const char *interface = "";
1694
struct ifreq network;
1695
int sd = -1;
1696
bool take_down_interface = false;
1697
char tempdir[] = "/tmp/mandosXXXXXX";
1698
bool tempdir_created = false;
1699
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1700
const char *seckey = PATHDIR "/" SECKEY;
1701
const char *pubkey = PATHDIR "/" PUBKEY;
1702
1703
bool gnutls_initialized = false;
1704
bool gpgme_initialized = false;
1705
float delay = 2.5f;
1706
double retry_interval = 10; /* 10s between trying a server and
1707
retrying the same server again */
1708
1709
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1710
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1711
1712
uid = getuid();
1713
gid = getgid();
1714
1715
/* Lower any group privileges we might have, just to be safe */
1716
errno = 0;
1717
ret = setgid(gid);
1718
if(ret == -1){
1719
perror_plus("setgid");
1720
}
1721
1722
/* Lower user privileges (temporarily) */
1723
errno = 0;
1724
ret = seteuid(uid);
1725
if(ret == -1){
1726
perror_plus("seteuid");
1727
}
1728
1729
if(quit_now){
1730
goto end;
1731
}
1732
1733
{
1734
struct argp_option options[] = {
1735
{ .name = "debug", .key = 128,
1736
.doc = "Debug mode", .group = 3 },
1737
{ .name = "connect", .key = 'c',
1738
.arg = "ADDRESS:PORT",
1739
.doc = "Connect directly to a specific Mandos server",
1740
.group = 1 },
1741
{ .name = "interface", .key = 'i',
1742
.arg = "NAME",
1743
.doc = "Network interface that will be used to search for"
1744
" Mandos servers",
1745
.group = 1 },
1746
{ .name = "seckey", .key = 's',
1747
.arg = "FILE",
1748
.doc = "OpenPGP secret key file base name",
1749
.group = 1 },
1750
{ .name = "pubkey", .key = 'p',
1751
.arg = "FILE",
1752
.doc = "OpenPGP public key file base name",
1753
.group = 2 },
1754
{ .name = "dh-bits", .key = 129,
1755
.arg = "BITS",
1756
.doc = "Bit length of the prime number used in the"
1757
" Diffie-Hellman key exchange",
1758
.group = 2 },
1759
{ .name = "priority", .key = 130,
1760
.arg = "STRING",
1761
.doc = "GnuTLS priority string for the TLS handshake",
1762
.group = 1 },
1763
{ .name = "delay", .key = 131,
1764
.arg = "SECONDS",
1765
.doc = "Maximum delay to wait for interface startup",
1766
.group = 2 },
1767
{ .name = "retry", .key = 132,
1768
.arg = "SECONDS",
1769
.doc = "Retry interval used when denied by the Mandos server",
1770
.group = 2 },
1771
{ .name = "network-hook-dir", .key = 133,
1772
.arg = "DIR",
1773
.doc = "Directory where network hooks are located",
1774
.group = 2 },
1775
/*
1776
* These reproduce what we would get without ARGP_NO_HELP
1777
*/
1778
{ .name = "help", .key = '?',
1779
.doc = "Give this help list", .group = -1 },
1780
{ .name = "usage", .key = -3,
1781
.doc = "Give a short usage message", .group = -1 },
1782
{ .name = "version", .key = 'V',
1783
.doc = "Print program version", .group = -1 },
1784
{ .name = NULL }
1785
};
1786
1787
error_t parse_opt(int key, char *arg,
1788
struct argp_state *state){
1789
errno = 0;
1790
switch(key){
1791
case 128: /* --debug */
1792
debug = true;
1793
break;
1794
case 'c': /* --connect */
1795
connect_to = arg;
1796
break;
1797
case 'i': /* --interface */
1798
interface = arg;
1799
break;
1800
case 's': /* --seckey */
1801
seckey = arg;
1802
break;
1803
case 'p': /* --pubkey */
1804
pubkey = arg;
1805
break;
1806
case 129: /* --dh-bits */
1807
errno = 0;
1808
tmpmax = strtoimax(arg, &tmp, 10);
1809
if(errno != 0 or tmp == arg or *tmp != '\0'
1810
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1811
argp_error(state, "Bad number of DH bits");
1812
}
1813
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1814
break;
1815
case 130: /* --priority */
1816
mc.priority = arg;
1817
break;
1818
case 131: /* --delay */
1819
errno = 0;
1820
delay = strtof(arg, &tmp);
1821
if(errno != 0 or tmp == arg or *tmp != '\0'){
1822
argp_error(state, "Bad delay");
1823
}
1824
case 132: /* --retry */
1825
errno = 0;
1826
retry_interval = strtod(arg, &tmp);
1827
if(errno != 0 or tmp == arg or *tmp != '\0'
1828
or (retry_interval * 1000) > INT_MAX
1829
or retry_interval < 0){
1830
argp_error(state, "Bad retry interval");
1831
}
1832
break;
1833
case 133: /* --network-hook-dir */
1834
hookdir = arg;
1835
break;
1836
/*
1837
* These reproduce what we would get without ARGP_NO_HELP
1838
*/
1839
case '?': /* --help */
1840
argp_state_help(state, state->out_stream,
1841
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1842
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1843
case -3: /* --usage */
1844
argp_state_help(state, state->out_stream,
1845
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1846
case 'V': /* --version */
1847
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1848
exit(argp_err_exit_status);
1849
break;
1850
default:
1851
return ARGP_ERR_UNKNOWN;
1852
}
1853
return errno;
1854
}
1855
1856
struct argp argp = { .options = options, .parser = parse_opt,
1857
.args_doc = "",
1858
.doc = "Mandos client -- Get and decrypt"
1859
" passwords from a Mandos server" };
1860
ret = argp_parse(&argp, argc, argv,
1861
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1862
switch(ret){
1863
case 0:
1864
break;
1865
case ENOMEM:
1866
default:
1867
errno = ret;
1868
perror_plus("argp_parse");
1869
exitcode = EX_OSERR;
1870
goto end;
1871
case EINVAL:
1872
exitcode = EX_USAGE;
1873
goto end;
1874
}
1875
}
1876
1877
{
1878
/* Work around Debian bug #633582:
1879
<http://bugs.debian.org/633582> */
1880
1881
/* Re-raise priviliges */
1882
if(raise_privileges() == 0){
1883
struct stat st;
1884
1885
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1886
int seckey_fd = open(seckey, O_RDONLY);
1887
if(seckey_fd == -1){
1888
perror_plus("open");
1889
} else {
1890
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1891
if(ret == -1){
1892
perror_plus("fstat");
1893
} else {
1894
if(S_ISREG(st.st_mode)
1895
and st.st_uid == 0 and st.st_gid == 0){
1896
ret = fchown(seckey_fd, uid, gid);
1897
if(ret == -1){
1898
perror_plus("fchown");
1899
}
1900
}
1901
}
1902
TEMP_FAILURE_RETRY(close(seckey_fd));
1903
}
1904
}
1905
1906
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1907
int pubkey_fd = open(pubkey, O_RDONLY);
1908
if(pubkey_fd == -1){
1909
perror_plus("open");
1910
} else {
1911
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1912
if(ret == -1){
1913
perror_plus("fstat");
1914
} else {
1915
if(S_ISREG(st.st_mode)
1916
and st.st_uid == 0 and st.st_gid == 0){
1917
ret = fchown(pubkey_fd, uid, gid);
1918
if(ret == -1){
1919
perror_plus("fchown");
1920
}
1921
}
1922
}
1923
TEMP_FAILURE_RETRY(close(pubkey_fd));
1924
}
1925
}
1926
1927
/* Lower privileges */
1928
errno = 0;
1929
ret = seteuid(uid);
1930
if(ret == -1){
1931
perror_plus("seteuid");
1932
}
1933
}
1934
}
1935
1936
/* Run network hooks */
1937
if(not run_network_hooks("start", interface, delay)){
1938
goto end;
1939
}
1940
1941
if(not debug){
1942
avahi_set_log_function(empty_log);
1943
}
1944
1945
if(interface[0] == '\0'){
1946
struct dirent **direntries;
1947
/* First look for interfaces that are up */
1948
ret = scandir(sys_class_net, &direntries, up_interface,
1949
alphasort);
1950
if(ret == 0){
1951
/* No up interfaces, look for any good interfaces */
1952
free(direntries);
1953
ret = scandir(sys_class_net, &direntries, good_interface,
1954
alphasort);
1955
}
1956
if(ret >= 1){
1957
/* Pick the first interface returned */
1958
interface = strdup(direntries[0]->d_name);
1959
if(debug){
1960
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1961
}
1962
if(interface == NULL){
1963
perror_plus("malloc");
1964
free(direntries);
1965
exitcode = EXIT_FAILURE;
1966
goto end;
1967
}
1968
free(direntries);
1969
} else {
1970
free(direntries);
1971
fprintf_plus(stderr, "Could not find a network interface\n");
1972
exitcode = EXIT_FAILURE;
1973
goto end;
1974
}
1975
}
1976
1977
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1978
from the signal handler */
1979
/* Initialize the pseudo-RNG for Avahi */
1980
srand((unsigned int) time(NULL));
1981
mc.simple_poll = avahi_simple_poll_new();
1982
if(mc.simple_poll == NULL){
1983
fprintf_plus(stderr,
1984
"Avahi: Failed to create simple poll object.\n");
1985
exitcode = EX_UNAVAILABLE;
1986
goto end;
1987
}
1988
1989
sigemptyset(&sigterm_action.sa_mask);
1990
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1991
if(ret == -1){
1992
perror_plus("sigaddset");
1993
exitcode = EX_OSERR;
1994
goto end;
1995
}
1996
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1997
if(ret == -1){
1998
perror_plus("sigaddset");
1999
exitcode = EX_OSERR;
2000
goto end;
2001
}
2002
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2003
if(ret == -1){
2004
perror_plus("sigaddset");
2005
exitcode = EX_OSERR;
2006
goto end;
2007
}
2008
/* Need to check if the handler is SIG_IGN before handling:
2009
| [[info:libc:Initial Signal Actions]] |
2010
| [[info:libc:Basic Signal Handling]] |
2011
*/
2012
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2013
if(ret == -1){
2014
perror_plus("sigaction");
2015
return EX_OSERR;
2016
}
2017
if(old_sigterm_action.sa_handler != SIG_IGN){
2018
ret = sigaction(SIGINT, &sigterm_action, NULL);
2019
if(ret == -1){
2020
perror_plus("sigaction");
2021
exitcode = EX_OSERR;
2022
goto end;
2023
}
2024
}
2025
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2026
if(ret == -1){
2027
perror_plus("sigaction");
2028
return EX_OSERR;
2029
}
2030
if(old_sigterm_action.sa_handler != SIG_IGN){
2031
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2032
if(ret == -1){
2033
perror_plus("sigaction");
2034
exitcode = EX_OSERR;
2035
goto end;
2036
}
2037
}
2038
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2039
if(ret == -1){
2040
perror_plus("sigaction");
2041
return EX_OSERR;
2042
}
2043
if(old_sigterm_action.sa_handler != SIG_IGN){
2044
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2045
if(ret == -1){
2046
perror_plus("sigaction");
2047
exitcode = EX_OSERR;
2048
goto end;
2049
}
2050
}
2051
2052
/* If the interface is down, bring it up */
2053
if((interface[0] != '\0') and (strcmp(interface, "none") != 0)){
2054
ret = bring_up_interface(interface, delay);
2055
if(ret != 0){
2056
errno = ret;
2057
perror_plus("Failed to bring up interface");
2058
}
2059
}
2060
2061
if(quit_now){
2062
goto end;
2063
}
2064
2065
ret = init_gnutls_global(pubkey, seckey);
2066
if(ret == -1){
2067
fprintf_plus(stderr, "init_gnutls_global failed\n");
2068
exitcode = EX_UNAVAILABLE;
2069
goto end;
2070
} else {
2071
gnutls_initialized = true;
2072
}
2073
2074
if(quit_now){
2075
goto end;
2076
}
2077
2078
if(mkdtemp(tempdir) == NULL){
2079
perror_plus("mkdtemp");
2080
goto end;
2081
}
2082
tempdir_created = true;
2083
2084
if(quit_now){
2085
goto end;
2086
}
2087
2088
if(not init_gpgme(pubkey, seckey, tempdir)){
2089
fprintf_plus(stderr, "init_gpgme failed\n");
2090
exitcode = EX_UNAVAILABLE;
2091
goto end;
2092
} else {
2093
gpgme_initialized = true;
2094
}
2095
2096
if(quit_now){
2097
goto end;
2098
}
2099
2100
if(connect_to != NULL){
2101
/* Connect directly, do not use Zeroconf */
2102
/* (Mainly meant for debugging) */
2103
char *address = strrchr(connect_to, ':');
2104
2105
if(address == NULL){
2106
fprintf_plus(stderr, "No colon in address\n");
2107
exitcode = EX_USAGE;
2108
goto end;
2109
}
2110
2111
if(quit_now){
2112
goto end;
2113
}
2114
2115
uint16_t port;
2116
errno = 0;
2117
tmpmax = strtoimax(address+1, &tmp, 10);
2118
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2119
or tmpmax != (uint16_t)tmpmax){
2120
fprintf_plus(stderr, "Bad port number\n");
2121
exitcode = EX_USAGE;
2122
goto end;
2123
}
2124
2125
if(quit_now){
2126
goto end;
2127
}
2128
2129
port = (uint16_t)tmpmax;
2130
*address = '\0';
2131
/* Colon in address indicates IPv6 */
2132
int af;
2133
if(strchr(connect_to, ':') != NULL){
2134
af = AF_INET6;
2135
/* Accept [] around IPv6 address - see RFC 5952 */
2136
if(connect_to[0] == '[' and address[-1] == ']')
2137
{
2138
connect_to++;
2139
address[-1] = '\0';
2140
}
2141
} else {
2142
af = AF_INET;
2143
}
2144
address = connect_to;
2145
2146
if(quit_now){
2147
goto end;
2148
}
2149
2150
while(not quit_now){
2151
ret = start_mandos_communication(address, port, if_index, af);
2152
if(quit_now or ret == 0){
2153
break;
2154
}
2155
if(debug){
2156
fprintf_plus(stderr, "Retrying in %d seconds\n",
2157
(int)retry_interval);
2158
}
2159
sleep((int)retry_interval);
2160
}
2161
2162
if (not quit_now){
2163
exitcode = EXIT_SUCCESS;
2164
}
2165
2166
goto end;
2167
}
2168
2169
if(quit_now){
2170
goto end;
2171
}
2172
2173
{
2174
AvahiServerConfig config;
2175
/* Do not publish any local Zeroconf records */
2176
avahi_server_config_init(&config);
2177
config.publish_hinfo = 0;
2178
config.publish_addresses = 0;
2179
config.publish_workstation = 0;
2180
config.publish_domain = 0;
2181
2182
/* Allocate a new server */
2183
mc.server = avahi_server_new(avahi_simple_poll_get
2184
(mc.simple_poll), &config, NULL,
2185
NULL, &error);
2186
2187
/* Free the Avahi configuration data */
2188
avahi_server_config_free(&config);
2189
}
2190
2191
/* Check if creating the Avahi server object succeeded */
2192
if(mc.server == NULL){
2193
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2194
avahi_strerror(error));
2195
exitcode = EX_UNAVAILABLE;
2196
goto end;
2197
}
2198
2199
if(quit_now){
2200
goto end;
2201
}
2202
2203
/* Create the Avahi service browser */
2204
sb = avahi_s_service_browser_new(mc.server, if_index,
2205
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2206
NULL, 0, browse_callback, NULL);
2207
if(sb == NULL){
2208
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2209
avahi_strerror(avahi_server_errno(mc.server)));
2210
exitcode = EX_UNAVAILABLE;
2211
goto end;
2212
}
2213
2214
if(quit_now){
2215
goto end;
2216
}
2217
2218
/* Run the main loop */
2219
2220
if(debug){
2221
fprintf_plus(stderr, "Starting Avahi loop search\n");
2222
}
2223
2224
ret = avahi_loop_with_timeout(mc.simple_poll,
2225
(int)(retry_interval * 1000));
2226
if(debug){
2227
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2228
(ret == 0) ? "successfully" : "with error");
2229
}
2230
2231
end:
2232
2233
if(debug){
2234
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2235
}
2236
2237
/* Cleanup things */
2238
if(sb != NULL)
2239
avahi_s_service_browser_free(sb);
2240
2241
if(mc.server != NULL)
2242
avahi_server_free(mc.server);
2243
2244
if(mc.simple_poll != NULL)
2245
avahi_simple_poll_free(mc.simple_poll);
2246
2247
if(gnutls_initialized){
2248
gnutls_certificate_free_credentials(mc.cred);
2249
gnutls_global_deinit();
2250
gnutls_dh_params_deinit(mc.dh_params);
2251
}
2252
2253
if(gpgme_initialized){
2254
gpgme_release(mc.ctx);
2255
}
2256
2257
/* Cleans up the circular linked list of Mandos servers the client
2258
has seen */
2259
if(mc.current_server != NULL){
2260
mc.current_server->prev->next = NULL;
2261
while(mc.current_server != NULL){
2262
server *next = mc.current_server->next;
2263
free(mc.current_server);
2264
mc.current_server = next;
2265
}
2266
}
2267
2268
/* Run network hooks */
2269
run_network_hooks("stop", interface, delay);
2270
2271
/* Re-raise priviliges */
2272
{
2273
raise_privileges();
2274
2275
/* Take down the network interface */
2276
if(take_down_interface and geteuid() == 0){
815
AvahiSServiceBrowser *sb = NULL;
816
int error;
817
int ret;
818
int exitcode = EXIT_SUCCESS;
819
const char *interface = "eth0";
820
struct ifreq network;
821
int sd;
822
uid_t uid;
823
gid_t gid;
824
char *connect_to = NULL;
825
char tempdir[] = "/tmp/mandosXXXXXX";
826
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
827
const char *seckey = PATHDIR "/" SECKEY;
828
const char *pubkey = PATHDIR "/" PUBKEY;
829
830
mandos_context mc = { .simple_poll = NULL, .server = NULL,
831
.dh_bits = 1024, .priority = "SECURE256"
832
":!CTYPE-X.509:+CTYPE-OPENPGP" };
833
bool gnutls_initalized = false;
834
bool gpgme_initalized = false;
835
836
{
837
struct argp_option options[] = {
838
{ .name = "debug", .key = 128,
839
.doc = "Debug mode", .group = 3 },
840
{ .name = "connect", .key = 'c',
841
.arg = "ADDRESS:PORT",
842
.doc = "Connect directly to a specific Mandos server",
843
.group = 1 },
844
{ .name = "interface", .key = 'i',
845
.arg = "NAME",
846
.doc = "Interface that will be used to search for Mandos"
847
" servers",
848
.group = 1 },
849
{ .name = "seckey", .key = 's',
850
.arg = "FILE",
851
.doc = "OpenPGP secret key file base name",
852
.group = 1 },
853
{ .name = "pubkey", .key = 'p',
854
.arg = "FILE",
855
.doc = "OpenPGP public key file base name",
856
.group = 2 },
857
{ .name = "dh-bits", .key = 129,
858
.arg = "BITS",
859
.doc = "Bit length of the prime number used in the"
860
" Diffie-Hellman key exchange",
861
.group = 2 },
862
{ .name = "priority", .key = 130,
863
.arg = "STRING",
864
.doc = "GnuTLS priority string for the TLS handshake",
865
.group = 1 },
866
{ .name = NULL }
867
};
868
869
error_t parse_opt (int key, char *arg,
870
struct argp_state *state) {
871
/* Get the INPUT argument from `argp_parse', which we know is
872
a pointer to our plugin list pointer. */
873
switch (key) {
874
case 128: /* --debug */
875
debug = true;
876
break;
877
case 'c': /* --connect */
878
connect_to = arg;
879
break;
880
case 'i': /* --interface */
881
interface = arg;
882
break;
883
case 's': /* --seckey */
884
seckey = arg;
885
break;
886
case 'p': /* --pubkey */
887
pubkey = arg;
888
break;
889
case 129: /* --dh-bits */
890
errno = 0;
891
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
892
if (errno){
893
perror("strtol");
894
exit(EXIT_FAILURE);
895
}
896
break;
897
case 130: /* --priority */
898
mc.priority = arg;
899
break;
900
case ARGP_KEY_ARG:
901
argp_usage (state);
902
case ARGP_KEY_END:
903
break;
904
default:
905
return ARGP_ERR_UNKNOWN;
906
}
907
return 0;
908
}
909
910
struct argp argp = { .options = options, .parser = parse_opt,
911
.args_doc = "",
912
.doc = "Mandos client -- Get and decrypt"
913
" passwords from a Mandos server" };
914
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
915
if (ret == ARGP_ERR_UNKNOWN){
916
fprintf(stderr, "Unknown error while parsing arguments\n");
917
exitcode = EXIT_FAILURE;
918
goto end;
919
}
920
}
921
922
/* If the interface is down, bring it up */
923
{
924
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
925
if(sd < 0) {
926
perror("socket");
927
exitcode = EXIT_FAILURE;
928
goto end;
929
}
930
strcpy(network.ifr_name, interface);
2277
931
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2278
932
if(ret == -1){
2279
perror_plus("ioctl SIOCGIFFLAGS");
2280
} else if(network.ifr_flags & IFF_UP){
2281
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
933
perror("ioctl SIOCGIFFLAGS");
934
exitcode = EXIT_FAILURE;
935
goto end;
936
}
937
if((network.ifr_flags & IFF_UP) == 0){
938
network.ifr_flags |= IFF_UP;
2282
939
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2283
940
if(ret == -1){
2284
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2285
}
2286
}
2287
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2288
if(ret == -1){
2289
perror_plus("close");
2290
}
2291
}
2292
}
2293
/* Lower privileges permanently */
2294
errno = 0;
2295
ret = setuid(uid);
2296
if(ret == -1){
2297
perror_plus("setuid");
2298
}
2299
2300
/* Removes the GPGME temp directory and all files inside */
2301
if(tempdir_created){
2302
struct dirent **direntries = NULL;
2303
struct dirent *direntry = NULL;
2304
int numentries = scandir(tempdir, &direntries, notdotentries,
2305
alphasort);
2306
if (numentries > 0){
2307
for(int i = 0; i < numentries; i++){
2308
direntry = direntries[i];
2309
char *fullname = NULL;
2310
ret = asprintf(&fullname, "%s/%s", tempdir,
2311
direntry->d_name);
2312
if(ret < 0){
2313
perror_plus("asprintf");
2314
continue;
2315
}
2316
ret = remove(fullname);
2317
if(ret == -1){
2318
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2319
strerror(errno));
2320
}
2321
free(fullname);
2322
}
2323
}
2324
2325
/* need to clean even if 0 because man page doesn't specify */
2326
free(direntries);
2327
if (numentries == -1){
2328
perror_plus("scandir");
2329
}
2330
ret = rmdir(tempdir);
2331
if(ret == -1 and errno != ENOENT){
2332
perror_plus("rmdir");
2333
}
2334
}
2335
2336
if(quit_now){
2337
sigemptyset(&old_sigterm_action.sa_mask);
2338
old_sigterm_action.sa_handler = SIG_DFL;
2339
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2340
&old_sigterm_action,
2341
NULL));
2342
if(ret == -1){
2343
perror_plus("sigaction");
2344
}
2345
do {
2346
ret = raise(signal_received);
2347
} while(ret != 0 and errno == EINTR);
2348
if(ret != 0){
2349
perror_plus("raise");
2350
abort();
2351
}
2352
TEMP_FAILURE_RETRY(pause());
2353
}
2354
2355
return exitcode;
941
perror("ioctl SIOCSIFFLAGS");
942
exitcode = EXIT_FAILURE;
943
goto end;
944
}
945
}
946
ret = TEMP_FAILURE_RETRY(close(sd));
947
if(ret == -1){
948
perror("close");
949
}
950
}
951
952
uid = getuid();
953
gid = getgid();
954
955
ret = setuid(uid);
956
if (ret == -1){
957
perror("setuid");
958
}
959
960
setgid(gid);
961
if (ret == -1){
962
perror("setgid");
963
}
964
965
ret = init_gnutls_global(&mc, pubkey, seckey);
966
if (ret == -1){
967
fprintf(stderr, "init_gnutls_global failed\n");
968
exitcode = EXIT_FAILURE;
969
goto end;
970
} else {
971
gnutls_initalized = true;
972
}
973
974
if(mkdtemp(tempdir) == NULL){
975
perror("mkdtemp");
976
tempdir[0] = '\0';
977
goto end;
978
}
979
980
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
981
fprintf(stderr, "gpgme_initalized failed\n");
982
exitcode = EXIT_FAILURE;
983
goto end;
984
} else {
985
gpgme_initalized = true;
986
}
987
988
if_index = (AvahiIfIndex) if_nametoindex(interface);
989
if(if_index == 0){
990
fprintf(stderr, "No such interface: \"%s\"\n", interface);
991
exit(EXIT_FAILURE);
992
}
993
994
if(connect_to != NULL){
995
/* Connect directly, do not use Zeroconf */
996
/* (Mainly meant for debugging) */
997
char *address = strrchr(connect_to, ':');
998
if(address == NULL){
999
fprintf(stderr, "No colon in address\n");
1000
exitcode = EXIT_FAILURE;
1001
goto end;
1002
}
1003
errno = 0;
1004
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
1005
if(errno){
1006
perror("Bad port number");
1007
exitcode = EXIT_FAILURE;
1008
goto end;
1009
}
1010
*address = '\0';
1011
address = connect_to;
1012
ret = start_mandos_communication(address, port, if_index, &mc);
1013
if(ret < 0){
1014
exitcode = EXIT_FAILURE;
1015
} else {
1016
exitcode = EXIT_SUCCESS;
1017
}
1018
goto end;
1019
}
1020
1021
if (not debug){
1022
avahi_set_log_function(empty_log);
1023
}
1024
1025
/* Initialize the pseudo-RNG for Avahi */
1026
srand((unsigned int) time(NULL));
1027
1028
/* Allocate main Avahi loop object */
1029
mc.simple_poll = avahi_simple_poll_new();
1030
if (mc.simple_poll == NULL) {
1031
fprintf(stderr, "Avahi: Failed to create simple poll"
1032
" object.\n");
1033
exitcode = EXIT_FAILURE;
1034
goto end;
1035
}
1036
1037
{
1038
AvahiServerConfig config;
1039
/* Do not publish any local Zeroconf records */
1040
avahi_server_config_init(&config);
1041
config.publish_hinfo = 0;
1042
config.publish_addresses = 0;
1043
config.publish_workstation = 0;
1044
config.publish_domain = 0;
1045
1046
/* Allocate a new server */
1047
mc.server = avahi_server_new(avahi_simple_poll_get
1048
(mc.simple_poll), &config, NULL,
1049
NULL, &error);
1050
1051
/* Free the Avahi configuration data */
1052
avahi_server_config_free(&config);
1053
}
1054
1055
/* Check if creating the Avahi server object succeeded */
1056
if (mc.server == NULL) {
1057
fprintf(stderr, "Failed to create Avahi server: %s\n",
1058
avahi_strerror(error));
1059
exitcode = EXIT_FAILURE;
1060
goto end;
1061
}
1062
1063
/* Create the Avahi service browser */
1064
sb = avahi_s_service_browser_new(mc.server, if_index,
1065
AVAHI_PROTO_INET6,
1066
"_mandos._tcp", NULL, 0,
1067
browse_callback, &mc);
1068
if (sb == NULL) {
1069
fprintf(stderr, "Failed to create service browser: %s\n",
1070
avahi_strerror(avahi_server_errno(mc.server)));
1071
exitcode = EXIT_FAILURE;
1072
goto end;
1073
}
1074
1075
/* Run the main loop */
1076
1077
if (debug){
1078
fprintf(stderr, "Starting Avahi loop search\n");
1079
}
1080
1081
avahi_simple_poll_loop(mc.simple_poll);
1082
1083
end:
1084
1085
if (debug){
1086
fprintf(stderr, "%s exiting\n", argv[0]);
1087
}
1088
1089
/* Cleanup things */
1090
if (sb != NULL)
1091
avahi_s_service_browser_free(sb);
1092
1093
if (mc.server != NULL)
1094
avahi_server_free(mc.server);
1095
1096
if (mc.simple_poll != NULL)
1097
avahi_simple_poll_free(mc.simple_poll);
1098
1099
if (gnutls_initalized){
1100
gnutls_certificate_free_credentials(mc.cred);
1101
gnutls_global_deinit ();
1102
gnutls_dh_params_deinit(mc.dh_params);
1103
}
1104
1105
if(gpgme_initalized){
1106
gpgme_release(mc.ctx);
1107
}
1108
1109
/* Removes the temp directory used by GPGME */
1110
if(tempdir[0] != '\0'){
1111
DIR *d;
1112
struct dirent *direntry;
1113
d = opendir(tempdir);
1114
if(d == NULL){
1115
perror("opendir");
1116
} else {
1117
while(true){
1118
direntry = readdir(d);
1119
if(direntry == NULL){
1120
break;
1121
}
1122
if (direntry->d_type == DT_REG){
1123
char *fullname = NULL;
1124
ret = asprintf(&fullname, "%s/%s", tempdir,
1125
direntry->d_name);
1126
if(ret < 0){
1127
perror("asprintf");
1128
continue;
1129
}
1130
ret = unlink(fullname);
1131
if(ret == -1){
1132
fprintf(stderr, "unlink(\"%s\"): %s",
1133
fullname, strerror(errno));
1134
}
1135
free(fullname);
1136
}
1137
}
1138
closedir(d);
1139
}
1140
ret = rmdir(tempdir);
1141
if(ret == -1){
1142
perror("rmdir");
1143
}
1144
}
1145
1146
return exitcode;
2356
1147
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0