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- Committer: Teddy Hogeborn
- Date: 2014-03-06 02:26:04 UTC
- Revision ID: teddy@recompile.se-20140306022604-4uc43taz25cflgi3
Bug fix: Free all memory and give better messages when memory is full.
* plugin-runner.c (add_to_char_array): Bug fix: If realloc fails, do
not change old array pointer.
(add_environment): Bug fix: If realloc fails, do not change old
environment pointer. Also rename "e" to "envdef"
for clarity.
(main): Bug fix: If realloc fails, do not change old pointers. Also
wrap "#pragma GCC" with "#ifdef ___GNUC___".
* plugins.d/mandos-client.c (incbuffer): Bug fix: if realloc fails,
free old buffer.
(run_network_hooks): Moved variables "directory" and "ret" to their
innermost possible scope.
(take_down_interface): Moved variables "sd", "ret_errno", and
"ret_setflags" to their innermost possible
scope.
(main): Removed variable "interfaces_hooks_size". Also, if argz_add
fails when adding all found interfaces, the error message
will now be correct. Also print error message if, after
having taken up an interface, argz_add fails to add
interface to list of interfaces to be taken down.
* plugins.d/mandos-client.xml (OPTIONS): Explain better what "none"
means as argument to
"--interface" by negating
sense.
* plugins.d/password-prompt.c (fprintf_plus): Removed (unused).
* plugin-runner.c (add_to_char_array): Bug fix: If realloc fails, do
not change old array pointer.
(add_environment): Bug fix: If realloc fails, do not change old
environment pointer. Also rename "e" to "envdef"
for clarity.
(main): Bug fix: If realloc fails, do not change old pointers. Also
wrap "#pragma GCC" with "#ifdef ___GNUC___".
* plugins.d/mandos-client.c (incbuffer): Bug fix: if realloc fails,
free old buffer.
(run_network_hooks): Moved variables "directory" and "ret" to their
innermost possible scope.
(take_down_interface): Moved variables "sd", "ret_errno", and
"ret_setflags" to their innermost possible
scope.
(main): Removed variable "interfaces_hooks_size". Also, if argz_add
fails when adding all found interfaces, the error message
will now be correct. Also print error message if, after
having taken up an interface, argz_add fails to add
interface to list of interfaces to be taken down.
* plugins.d/mandos-client.xml (OPTIONS): Explain better what "none"
means as argument to
"--interface" by negating
sense.
* plugins.d/password-prompt.c (fprintf_plus): Removed (unused).
- files added:
- DBUS-API
- debian/source
- network-hooks.d
- files removed:
- debian/mandos-client.config
- 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 © 2007-2008 Teddy Hogeborn & Björn Påhlsson
12
* Copyright © 2008-2013 Teddy Hogeborn
13
* Copyright © 2008-2013 Björn Påhlsson
13
14
*
14
15
* This program is free software: you can redistribute it and/or
15
16
* modify it under the terms of the GNU General Public License as
25
26
* along with this program. If not, see
26
27
* <http://www.gnu.org/licenses/>.
27
28
*
28
* Contact the authors at <mandos@fukt.bsnet.se>.
29
* Contact the authors at <mandos@recompile.se>.
29
30
*/
30
31
31
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
32
34
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
33
37
#define _FILE_OFFSET_BITS 64
38
#endif
34
39
35
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
36
41
37
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
38
stdout, ferror() */
39
#include <stdint.h> /* uint16_t, uint32_t */
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
40
45
#include <stddef.h> /* NULL, size_t, ssize_t */
41
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
42
srand() */
43
#include <stdbool.h> /* bool, true */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
#include <stdbool.h> /* bool, false, true */
44
49
#include <string.h> /* memset(), strcmp(), strlen(),
45
50
strerror(), asprintf(), strcpy() */
46
#include <sys/ioctl.h> /* ioctl */
51
#include <sys/ioctl.h> /* ioctl */
47
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
48
53
sockaddr_in6, PF_INET6,
49
SOCK_STREAM, INET6_ADDRSTRLEN,
50
uid_t, gid_t, open(), opendir(), DIR */
51
#include <sys/stat.h> /* open() */
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
52
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
53
struct in6_addr, inet_pton(),
54
connect() */
58
inet_pton(), connect() */
55
59
#include <fcntl.h> /* open() */
56
#include <dirent.h> /* opendir(), struct dirent, readdir() */
57
#include <inttypes.h> /* PRIu16 */
58
#include <assert.h> /* assert() */
59
#include <errno.h> /* perror(), errno */
60
#include <time.h> /* time() */
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() */
61
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
62
68
SIOCSIFFLAGS, if_indextoname(),
63
69
if_nametoindex(), IF_NAMESIZE */
64
#include <netinet/in.h>
70
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
72
*/
65
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
66
getuid(), getgid(), setuid(),
67
setgid() */
68
#include <arpa/inet.h> /* inet_pton(), htons */
69
#include <iso646.h> /* not, and */
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 */
70
78
#include <argp.h> /* struct argp_option, error_t, struct
71
79
argp_state, struct argp,
72
80
argp_parse(), ARGP_KEY_ARG,
73
81
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__ */
74
98
75
99
/* Avahi */
76
100
/* All Avahi types, constants and functions
89
113
gnutls_*
90
114
init_gnutls_session(),
91
115
GNUTLS_* */
92
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
93
GNUTLS_OPENPGP_FMT_BASE64 */
116
#include <gnutls/openpgp.h>
117
/* gnutls_certificate_set_openpgp_key_file(),
118
GNUTLS_OPENPGP_FMT_BASE64 */
94
119
95
120
/* GPGME */
96
121
#include <gpgme.h> /* All GPGME types, constants and
101
126
102
127
#define BUFFER_SIZE 256
103
128
104
/*
105
#define PATHDIR "/conf/conf.d/mandos"
106
*/
107
108
129
#define PATHDIR "/conf/conf.d/mandos"
109
130
#define SECKEY "seckey.txt"
110
131
#define PUBKEY "pubkey.txt"
132
#define HOOKDIR "/lib/mandos/network-hooks.d"
111
133
112
134
bool debug = false;
113
135
static const char mandos_protocol_version[] = "1";
114
const char *argp_program_version = "mandos-client 1.0";
115
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
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;
116
154
117
155
/* Used for passing in values through the Avahi callback functions */
118
156
typedef struct {
119
AvahiSimplePoll *simple_poll;
120
157
AvahiServer *server;
121
158
gnutls_certificate_credentials_t cred;
122
159
unsigned int dh_bits;
123
160
gnutls_dh_params_t dh_params;
124
161
const char *priority;
125
162
gpgme_ctx_t ctx;
163
server *current_server;
164
char *interfaces;
165
size_t interfaces_size;
126
166
} mandos_context;
127
167
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 (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
191
}
192
128
193
/*
129
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
130
* "buffer_capacity" is how much is currently allocated,
194
* Make additional room in "buffer" for at least BUFFER_SIZE more
195
* bytes. "buffer_capacity" is how much is currently allocated,
131
196
* "buffer_length" is how much is already used.
132
197
*/
133
size_t adjustbuffer(char **buffer, size_t buffer_length,
134
size_t buffer_capacity){
135
if (buffer_length + BUFFER_SIZE > buffer_capacity){
136
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
137
if (buffer == NULL){
198
size_t incbuffer(char **buffer, size_t buffer_length,
199
size_t buffer_capacity){
200
if(buffer_length + BUFFER_SIZE > buffer_capacity){
201
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
202
if(new_buf == NULL){
203
int old_errno = errno;
204
free(*buffer);
205
errno = old_errno;
206
*buffer = NULL;
138
207
return 0;
139
208
}
209
*buffer = new_buf;
140
210
buffer_capacity += BUFFER_SIZE;
141
211
}
142
212
return buffer_capacity;
143
213
}
144
214
215
/* Add server to set of servers to retry periodically */
216
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
217
int af, server **current_server){
218
int ret;
219
server *new_server = malloc(sizeof(server));
220
if(new_server == NULL){
221
perror_plus("malloc");
222
return false;
223
}
224
*new_server = (server){ .ip = strdup(ip),
225
.port = port,
226
.if_index = if_index,
227
.af = af };
228
if(new_server->ip == NULL){
229
perror_plus("strdup");
230
return false;
231
}
232
/* Special case of first server */
233
if(*current_server == NULL){
234
new_server->next = new_server;
235
new_server->prev = new_server;
236
*current_server = new_server;
237
/* Place the new server last in the list */
238
} else {
239
new_server->next = *current_server;
240
new_server->prev = (*current_server)->prev;
241
new_server->prev->next = new_server;
242
(*current_server)->prev = new_server;
243
}
244
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
245
if(ret == -1){
246
perror_plus("clock_gettime");
247
return false;
248
}
249
return true;
250
}
251
145
252
/*
146
253
* Initialize GPGME.
147
254
*/
148
static bool init_gpgme(mandos_context *mc, const char *seckey,
149
const char *pubkey, const char *tempdir){
150
int ret;
255
static bool init_gpgme(const char *seckey, const char *pubkey,
256
const char *tempdir, mandos_context *mc){
151
257
gpgme_error_t rc;
152
258
gpgme_engine_info_t engine_info;
153
259
154
155
260
/*
156
* Helper function to insert pub and seckey to the enigne keyring.
261
* Helper function to insert pub and seckey to the engine keyring.
157
262
*/
158
263
bool import_key(const char *filename){
264
int ret;
159
265
int fd;
160
266
gpgme_data_t pgp_data;
161
267
162
fd = TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
268
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
163
269
if(fd == -1){
164
perror("open");
270
perror_plus("open");
165
271
return false;
166
272
}
167
273
168
274
rc = gpgme_data_new_from_fd(&pgp_data, 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));
275
if(rc != GPG_ERR_NO_ERROR){
276
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
277
gpgme_strsource(rc), gpgme_strerror(rc));
172
278
return false;
173
279
}
174
280
175
281
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));
282
if(rc != GPG_ERR_NO_ERROR){
283
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
284
gpgme_strsource(rc), gpgme_strerror(rc));
179
285
return false;
180
286
}
181
287
182
ret = TEMP_FAILURE_RETRY(close(fd));
288
ret = (int)TEMP_FAILURE_RETRY(close(fd));
183
289
if(ret == -1){
184
perror("close");
290
perror_plus("close");
185
291
}
186
292
gpgme_data_release(pgp_data);
187
293
return true;
188
294
}
189
295
190
if (debug){
191
fprintf(stderr, "Initialize gpgme\n");
296
if(debug){
297
fprintf_plus(stderr, "Initializing GPGME\n");
192
298
}
193
299
194
300
/* Init GPGME */
195
301
gpgme_check_version(NULL);
196
302
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
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));
303
if(rc != GPG_ERR_NO_ERROR){
304
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
305
gpgme_strsource(rc), gpgme_strerror(rc));
200
306
return false;
201
307
}
202
308
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
/* Set GPGME home directory for the OpenPGP engine only */
310
rc = gpgme_get_engine_info(&engine_info);
311
if(rc != GPG_ERR_NO_ERROR){
312
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
313
gpgme_strsource(rc), gpgme_strerror(rc));
208
314
return false;
209
315
}
210
316
while(engine_info != NULL){
216
322
engine_info = engine_info->next;
217
323
}
218
324
if(engine_info == NULL){
219
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
325
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
326
tempdir);
220
327
return false;
221
328
}
222
329
223
330
/* Create new GPGME "context" */
224
331
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;
332
if(rc != GPG_ERR_NO_ERROR){
333
fprintf_plus(stderr, "Mandos plugin mandos-client: "
334
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
335
gpgme_strerror(rc));
336
return false;
337
}
338
339
if(not import_key(pubkey) or not import_key(seckey)){
340
return false;
341
}
342
343
return true;
236
344
}
237
345
238
346
/*
239
347
* Decrypt OpenPGP data.
240
348
* Returns -1 on error
241
349
*/
242
static ssize_t pgp_packet_decrypt (const mandos_context *mc,
243
const char *cryptotext,
244
size_t crypto_size,
245
char **plaintext){
350
static ssize_t pgp_packet_decrypt(const char *cryptotext,
351
size_t crypto_size,
352
char **plaintext,
353
mandos_context *mc){
246
354
gpgme_data_t dh_crypto, dh_plain;
247
355
gpgme_error_t rc;
248
356
ssize_t ret;
249
357
size_t plaintext_capacity = 0;
250
358
ssize_t plaintext_length = 0;
251
359
252
if (debug){
253
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
360
if(debug){
361
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
254
362
}
255
363
256
364
/* Create new GPGME data buffer from memory cryptotext */
257
365
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
258
366
0);
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));
367
if(rc != GPG_ERR_NO_ERROR){
368
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
369
gpgme_strsource(rc), gpgme_strerror(rc));
262
370
return -1;
263
371
}
264
372
265
373
/* Create new empty GPGME data buffer for the plaintext */
266
374
rc = gpgme_data_new(&dh_plain);
267
if (rc != GPG_ERR_NO_ERROR){
268
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
269
gpgme_strsource(rc), gpgme_strerror(rc));
375
if(rc != GPG_ERR_NO_ERROR){
376
fprintf_plus(stderr, "Mandos plugin mandos-client: "
377
"bad gpgme_data_new: %s: %s\n",
378
gpgme_strsource(rc), gpgme_strerror(rc));
270
379
gpgme_data_release(dh_crypto);
271
380
return -1;
272
381
}
274
383
/* Decrypt data from the cryptotext data buffer to the plaintext
275
384
data buffer */
276
385
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));
386
if(rc != GPG_ERR_NO_ERROR){
387
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
388
gpgme_strsource(rc), gpgme_strerror(rc));
280
389
plaintext_length = -1;
281
if (debug){
390
if(debug){
282
391
gpgme_decrypt_result_t result;
283
392
result = gpgme_op_decrypt_result(mc->ctx);
284
if (result == NULL){
285
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
393
if(result == NULL){
394
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
286
395
} else {
287
fprintf(stderr, "Unsupported algorithm: %s\n",
288
result->unsupported_algorithm);
289
fprintf(stderr, "Wrong key usage: %u\n",
290
result->wrong_key_usage);
396
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
397
result->unsupported_algorithm);
398
fprintf_plus(stderr, "Wrong key usage: %u\n",
399
result->wrong_key_usage);
291
400
if(result->file_name != NULL){
292
fprintf(stderr, "File name: %s\n", result->file_name);
401
fprintf_plus(stderr, "File name: %s\n", result->file_name);
293
402
}
294
403
gpgme_recipient_t recipient;
295
404
recipient = result->recipients;
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
}
405
while(recipient != NULL){
406
fprintf_plus(stderr, "Public key algorithm: %s\n",
407
gpgme_pubkey_algo_name
408
(recipient->pubkey_algo));
409
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
410
fprintf_plus(stderr, "Secret key available: %s\n",
411
recipient->status == GPG_ERR_NO_SECKEY
412
? "No" : "Yes");
413
recipient = recipient->next;
306
414
}
307
415
}
308
416
}
310
418
}
311
419
312
420
if(debug){
313
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
421
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
314
422
}
315
423
316
424
/* Seek back to the beginning of the GPGME plaintext data buffer */
317
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
318
perror("gpgme_data_seek");
425
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
426
perror_plus("gpgme_data_seek");
319
427
plaintext_length = -1;
320
428
goto decrypt_end;
321
429
}
322
430
323
431
*plaintext = NULL;
324
432
while(true){
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;
433
plaintext_capacity = incbuffer(plaintext,
434
(size_t)plaintext_length,
435
plaintext_capacity);
436
if(plaintext_capacity == 0){
437
perror_plus("incbuffer");
438
plaintext_length = -1;
439
goto decrypt_end;
332
440
}
333
441
334
442
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
335
443
BUFFER_SIZE);
336
444
/* Print the data, if any */
337
if (ret == 0){
445
if(ret == 0){
338
446
/* EOF */
339
447
break;
340
448
}
341
449
if(ret < 0){
342
perror("gpgme_data_read");
450
perror_plus("gpgme_data_read");
343
451
plaintext_length = -1;
344
452
goto decrypt_end;
345
453
}
347
455
}
348
456
349
457
if(debug){
350
fprintf(stderr, "Decrypted password is: ");
458
fprintf_plus(stderr, "Decrypted password is: ");
351
459
for(ssize_t i = 0; i < plaintext_length; i++){
352
460
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
353
461
}
364
472
return plaintext_length;
365
473
}
366
474
367
static const char * safer_gnutls_strerror (int value) {
368
const char *ret = gnutls_strerror (value); /* Spurious warning */
369
if (ret == NULL)
475
static const char * safer_gnutls_strerror(int value){
476
const char *ret = gnutls_strerror(value);
477
if(ret == NULL)
370
478
ret = "(unknown)";
371
479
return ret;
372
480
}
374
482
/* GnuTLS log function callback */
375
483
static void debuggnutls(__attribute__((unused)) int level,
376
484
const char* string){
377
fprintf(stderr, "GnuTLS: %s", string);
485
fprintf_plus(stderr, "GnuTLS: %s", string);
378
486
}
379
487
380
static int init_gnutls_global(mandos_context *mc,
381
const char *pubkeyfilename,
382
const char *seckeyfilename){
488
static int init_gnutls_global(const char *pubkeyfilename,
489
const char *seckeyfilename,
490
mandos_context *mc){
383
491
int ret;
384
492
385
493
if(debug){
386
fprintf(stderr, "Initializing GnuTLS\n");
494
fprintf_plus(stderr, "Initializing GnuTLS\n");
387
495
}
388
496
389
497
ret = gnutls_global_init();
390
if (ret != GNUTLS_E_SUCCESS) {
391
fprintf (stderr, "GnuTLS global_init: %s\n",
392
safer_gnutls_strerror(ret));
498
if(ret != GNUTLS_E_SUCCESS){
499
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
500
safer_gnutls_strerror(ret));
393
501
return -1;
394
502
}
395
503
396
if (debug){
504
if(debug){
397
505
/* "Use a log level over 10 to enable all debugging options."
398
506
* - GnuTLS manual
399
507
*/
402
510
}
403
511
404
512
/* OpenPGP credentials */
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 ();
513
ret = gnutls_certificate_allocate_credentials(&mc->cred);
514
if(ret != GNUTLS_E_SUCCESS){
515
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
516
safer_gnutls_strerror(ret));
517
gnutls_global_deinit();
411
518
return -1;
412
519
}
413
520
414
521
if(debug){
415
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
416
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
417
seckeyfilename);
522
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
523
" secret key %s as GnuTLS credentials\n",
524
pubkeyfilename,
525
seckeyfilename);
418
526
}
419
527
420
528
ret = gnutls_certificate_set_openpgp_key_file
421
529
(mc->cred, pubkeyfilename, seckeyfilename,
422
530
GNUTLS_OPENPGP_FMT_BASE64);
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
if(ret != GNUTLS_E_SUCCESS){
532
fprintf_plus(stderr,
533
"Error[%d] while reading the OpenPGP key pair ('%s',"
534
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
535
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
536
safer_gnutls_strerror(ret));
429
537
goto globalfail;
430
538
}
431
539
432
540
/* GnuTLS server initialization */
433
541
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));
542
if(ret != GNUTLS_E_SUCCESS){
543
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
544
" initialization: %s\n",
545
safer_gnutls_strerror(ret));
437
546
goto globalfail;
438
547
}
439
548
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));
549
if(ret != GNUTLS_E_SUCCESS){
550
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
551
safer_gnutls_strerror(ret));
443
552
goto globalfail;
444
553
}
445
554
455
564
return -1;
456
565
}
457
566
458
static int init_gnutls_session(mandos_context *mc,
459
gnutls_session_t *session){
567
static int init_gnutls_session(gnutls_session_t *session,
568
mandos_context *mc){
460
569
int ret;
461
570
/* GnuTLS session creation */
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));
571
do {
572
ret = gnutls_init(session, GNUTLS_SERVER);
573
if(quit_now){
574
return -1;
575
}
576
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
577
if(ret != GNUTLS_E_SUCCESS){
578
fprintf_plus(stderr,
579
"Error in GnuTLS session initialization: %s\n",
580
safer_gnutls_strerror(ret));
466
581
}
467
582
468
583
{
469
584
const char *err;
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);
585
do {
586
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
587
if(quit_now){
588
gnutls_deinit(*session);
589
return -1;
590
}
591
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
592
if(ret != GNUTLS_E_SUCCESS){
593
fprintf_plus(stderr, "Syntax error at: %s\n", err);
594
fprintf_plus(stderr, "GnuTLS error: %s\n",
595
safer_gnutls_strerror(ret));
596
gnutls_deinit(*session);
476
597
return -1;
477
598
}
478
599
}
479
600
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);
601
do {
602
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
603
mc->cred);
604
if(quit_now){
605
gnutls_deinit(*session);
606
return -1;
607
}
608
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
609
if(ret != GNUTLS_E_SUCCESS){
610
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
611
safer_gnutls_strerror(ret));
612
gnutls_deinit(*session);
486
613
return -1;
487
614
}
488
615
489
616
/* ignore client certificate if any. */
490
gnutls_certificate_server_set_request (*session,
491
GNUTLS_CERT_IGNORE);
617
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
492
618
493
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
619
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
494
620
495
621
return 0;
496
622
}
500
626
__attribute__((unused)) const char *txt){}
501
627
502
628
/* Called when a Mandos server is found */
503
static int start_mandos_communication(const char *ip, uint16_t port,
629
static int start_mandos_communication(const char *ip, in_port_t port,
504
630
AvahiIfIndex if_index,
505
mandos_context *mc){
506
int ret, tcp_sd;
507
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
631
int af, mandos_context *mc){
632
int ret, tcp_sd = -1;
633
ssize_t sret;
634
union {
635
struct sockaddr_in in;
636
struct sockaddr_in6 in6;
637
} to;
508
638
char *buffer = NULL;
509
char *decrypted_buffer;
639
char *decrypted_buffer = NULL;
510
640
size_t buffer_length = 0;
511
641
size_t buffer_capacity = 0;
512
ssize_t decrypted_buffer_size;
513
642
size_t written;
514
int retval = 0;
515
char interface[IF_NAMESIZE];
643
int retval = -1;
516
644
gnutls_session_t session;
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");
645
int pf; /* Protocol family */
646
647
errno = 0;
648
649
if(quit_now){
650
errno = EINTR;
651
return -1;
652
}
653
654
switch(af){
655
case AF_INET6:
656
pf = PF_INET6;
657
break;
658
case AF_INET:
659
pf = PF_INET;
660
break;
661
default:
662
fprintf_plus(stderr, "Bad address family: %d\n", af);
663
errno = EINVAL;
664
return -1;
665
}
666
667
/* If the interface is specified and we have a list of interfaces */
668
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
669
/* Check if the interface is one of the interfaces we are using */
670
bool match = false;
671
{
672
char *interface = NULL;
673
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
674
interface))){
675
if(if_nametoindex(interface) == (unsigned int)if_index){
676
match = true;
677
break;
678
}
679
}
680
}
681
if(not match){
682
/* This interface does not match any in the list, so we don't
683
connect to the server */
684
if(debug){
685
char interface[IF_NAMESIZE];
686
if(if_indextoname((unsigned int)if_index, interface) == NULL){
687
perror_plus("if_indextoname");
688
} else {
689
fprintf_plus(stderr, "Skipping server on non-used interface"
690
" \"%s\"\n",
691
if_indextoname((unsigned int)if_index,
692
interface));
693
}
694
}
537
695
return -1;
538
696
}
539
fprintf(stderr, "Binding to interface %s\n", interface);
697
}
698
699
ret = init_gnutls_session(&session, mc);
700
if(ret != 0){
701
return -1;
702
}
703
704
if(debug){
705
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
706
PRIuMAX "\n", ip, (uintmax_t)port);
707
}
708
709
tcp_sd = socket(pf, SOCK_STREAM, 0);
710
if(tcp_sd < 0){
711
int e = errno;
712
perror_plus("socket");
713
errno = e;
714
goto mandos_end;
715
}
716
717
if(quit_now){
718
errno = EINTR;
719
goto mandos_end;
540
720
}
541
721
542
722
memset(&to, 0, sizeof(to));
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;
723
if(af == AF_INET6){
724
to.in6.sin6_family = (sa_family_t)af;
725
ret = inet_pton(af, ip, &to.in6.sin6_addr);
726
} else { /* IPv4 */
727
to.in.sin_family = (sa_family_t)af;
728
ret = inet_pton(af, ip, &to.in.sin_addr);
729
}
730
if(ret < 0 ){
731
int e = errno;
732
perror_plus("inet_pton");
733
errno = e;
734
goto mandos_end;
550
735
}
551
736
if(ret == 0){
552
fprintf(stderr, "Bad address: %s\n", ip);
553
return -1;
554
}
555
to.in6.sin6_port = htons(port); /* Spurious warning */
737
int e = errno;
738
fprintf_plus(stderr, "Bad address: %s\n", ip);
739
errno = e;
740
goto mandos_end;
741
}
742
if(af == AF_INET6){
743
to.in6.sin6_port = htons(port);
744
#ifdef __GNUC__
745
#pragma GCC diagnostic push
746
#pragma GCC diagnostic ignored "-Wstrict-aliasing"
747
#endif
748
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
749
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower */
750
#ifdef __GNUC__
751
#pragma GCC diagnostic pop
752
#endif
753
if(if_index == AVAHI_IF_UNSPEC){
754
fprintf_plus(stderr, "An IPv6 link-local address is"
755
" incomplete without a network interface\n");
756
errno = EINVAL;
757
goto mandos_end;
758
}
759
/* Set the network interface number as scope */
760
to.in6.sin6_scope_id = (uint32_t)if_index;
761
}
762
} else {
763
to.in.sin_port = htons(port);
764
}
556
765
557
to.in6.sin6_scope_id = (uint32_t)if_index;
766
if(quit_now){
767
errno = EINTR;
768
goto mandos_end;
769
}
558
770
559
771
if(debug){
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");
772
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
773
char interface[IF_NAMESIZE];
774
if(if_indextoname((unsigned int)if_index, interface) == NULL){
775
perror_plus("if_indextoname");
776
} else {
777
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
778
"\n", ip, interface, (uintmax_t)port);
779
}
780
} else {
781
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
782
ip, (uintmax_t)port);
783
}
784
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
785
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
786
const char *pcret;
787
if(af == AF_INET6){
788
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
789
sizeof(addrstr));
790
} else {
791
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
792
sizeof(addrstr));
793
}
794
if(pcret == NULL){
795
perror_plus("inet_ntop");
566
796
} else {
567
797
if(strcmp(addrstr, ip) != 0){
568
fprintf(stderr, "Canonical address form: %s\n", addrstr);
798
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
569
799
}
570
800
}
571
801
}
572
802
573
ret = connect(tcp_sd, &to.in, sizeof(to));
574
if (ret < 0){
575
perror("connect");
576
return -1;
803
if(quit_now){
804
errno = EINTR;
805
goto mandos_end;
806
}
807
808
if(af == AF_INET6){
809
ret = connect(tcp_sd, &to.in6, sizeof(to));
810
} else {
811
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
812
}
813
if(ret < 0){
814
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
815
int e = errno;
816
perror_plus("connect");
817
errno = e;
818
}
819
goto mandos_end;
820
}
821
822
if(quit_now){
823
errno = EINTR;
824
goto mandos_end;
577
825
}
578
826
579
827
const char *out = mandos_protocol_version;
580
828
written = 0;
581
while (true){
829
while(true){
582
830
size_t out_size = strlen(out);
583
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
584
out_size - written));
585
if (ret == -1){
586
perror("write");
587
retval = -1;
831
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
832
out_size - written));
833
if(ret == -1){
834
int e = errno;
835
perror_plus("write");
836
errno = e;
588
837
goto mandos_end;
589
838
}
590
839
written += (size_t)ret;
591
840
if(written < out_size){
592
841
continue;
593
842
} else {
594
if (out == mandos_protocol_version){
843
if(out == mandos_protocol_version){
595
844
written = 0;
596
845
out = "\r\n";
597
846
} else {
598
847
break;
599
848
}
600
849
}
850
851
if(quit_now){
852
errno = EINTR;
853
goto mandos_end;
854
}
601
855
}
602
856
603
857
if(debug){
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);
858
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
859
}
860
861
if(quit_now){
862
errno = EINTR;
863
goto mandos_end;
864
}
865
866
/* This casting via intptr_t is to eliminate warning about casting
867
an int to a pointer type. This is exactly how the GnuTLS Guile
868
function "set-session-transport-fd!" does it. */
869
gnutls_transport_set_ptr(session,
870
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
871
872
if(quit_now){
873
errno = EINTR;
874
goto mandos_end;
875
}
876
877
do {
878
ret = gnutls_handshake(session);
879
if(quit_now){
880
errno = EINTR;
881
goto mandos_end;
882
}
611
883
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
612
884
613
if (ret != GNUTLS_E_SUCCESS){
885
if(ret != GNUTLS_E_SUCCESS){
614
886
if(debug){
615
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
616
gnutls_perror (ret);
887
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
888
gnutls_perror(ret);
617
889
}
618
retval = -1;
890
errno = EPROTO;
619
891
goto mandos_end;
620
892
}
621
893
622
894
/* Read OpenPGP packet that contains the wanted password */
623
895
624
896
if(debug){
625
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
626
ip);
897
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
898
" %s\n", ip);
627
899
}
628
900
629
901
while(true){
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){
902
903
if(quit_now){
904
errno = EINTR;
905
goto mandos_end;
906
}
907
908
buffer_capacity = incbuffer(&buffer, buffer_length,
909
buffer_capacity);
910
if(buffer_capacity == 0){
911
int e = errno;
912
perror_plus("incbuffer");
913
errno = e;
914
goto mandos_end;
915
}
916
917
if(quit_now){
918
errno = EINTR;
919
goto mandos_end;
920
}
921
922
sret = gnutls_record_recv(session, buffer+buffer_length,
923
BUFFER_SIZE);
924
if(sret == 0){
641
925
break;
642
926
}
643
if (ret < 0){
644
switch(ret){
927
if(sret < 0){
928
switch(sret){
645
929
case GNUTLS_E_INTERRUPTED:
646
930
case GNUTLS_E_AGAIN:
647
931
break;
648
932
case GNUTLS_E_REHANDSHAKE:
649
do{
650
ret = gnutls_handshake (session);
933
do {
934
ret = gnutls_handshake(session);
935
936
if(quit_now){
937
errno = EINTR;
938
goto mandos_end;
939
}
651
940
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
652
if (ret < 0){
653
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
654
gnutls_perror (ret);
655
retval = -1;
941
if(ret < 0){
942
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
943
"***\n");
944
gnutls_perror(ret);
945
errno = EPROTO;
656
946
goto mandos_end;
657
947
}
658
948
break;
659
949
default:
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);
950
fprintf_plus(stderr, "Unknown error while reading data from"
951
" encrypted session with Mandos server\n");
952
gnutls_bye(session, GNUTLS_SHUT_RDWR);
953
errno = EIO;
664
954
goto mandos_end;
665
955
}
666
956
} else {
667
buffer_length += (size_t) ret;
957
buffer_length += (size_t) sret;
668
958
}
669
959
}
670
960
671
961
if(debug){
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,
680
&decrypted_buffer);
681
if (decrypted_buffer_size >= 0){
962
fprintf_plus(stderr, "Closing TLS session\n");
963
}
964
965
if(quit_now){
966
errno = EINTR;
967
goto mandos_end;
968
}
969
970
do {
971
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
972
if(quit_now){
973
errno = EINTR;
974
goto mandos_end;
975
}
976
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
977
978
if(buffer_length > 0){
979
ssize_t decrypted_buffer_size;
980
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
981
&decrypted_buffer, mc);
982
if(decrypted_buffer_size >= 0){
983
682
984
written = 0;
683
985
while(written < (size_t) decrypted_buffer_size){
684
ret = (int)fwrite (decrypted_buffer + written, 1,
685
(size_t)decrypted_buffer_size - written,
686
stdout);
986
if(quit_now){
987
errno = EINTR;
988
goto mandos_end;
989
}
990
991
ret = (int)fwrite(decrypted_buffer + written, 1,
992
(size_t)decrypted_buffer_size - written,
993
stdout);
687
994
if(ret == 0 and ferror(stdout)){
995
int e = errno;
688
996
if(debug){
689
fprintf(stderr, "Error writing encrypted data: %s\n",
690
strerror(errno));
997
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
998
strerror(errno));
691
999
}
692
retval = -1;
693
break;
1000
errno = e;
1001
goto mandos_end;
694
1002
}
695
1003
written += (size_t)ret;
696
1004
}
697
free(decrypted_buffer);
698
} else {
699
retval = -1;
1005
retval = 0;
700
1006
}
701
} else {
702
retval = -1;
703
1007
}
704
1008
705
1009
/* Shutdown procedure */
706
1010
707
1011
mandos_end:
708
free(buffer);
709
ret = TEMP_FAILURE_RETRY(close(tcp_sd));
710
if(ret == -1){
711
perror("close");
1012
{
1013
int e = errno;
1014
free(decrypted_buffer);
1015
free(buffer);
1016
if(tcp_sd >= 0){
1017
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1018
}
1019
if(ret == -1){
1020
if(e == 0){
1021
e = errno;
1022
}
1023
perror_plus("close");
1024
}
1025
gnutls_deinit(session);
1026
errno = e;
1027
if(quit_now){
1028
errno = EINTR;
1029
retval = -1;
1030
}
712
1031
}
713
gnutls_deinit (session);
714
1032
return retval;
715
1033
}
716
1034
717
1035
static void resolve_callback(AvahiSServiceResolver *r,
718
1036
AvahiIfIndex interface,
719
AVAHI_GCC_UNUSED AvahiProtocol protocol,
1037
AvahiProtocol proto,
720
1038
AvahiResolverEvent event,
721
1039
const char *name,
722
1040
const char *type,
727
1045
AVAHI_GCC_UNUSED AvahiStringList *txt,
728
1046
AVAHI_GCC_UNUSED AvahiLookupResultFlags
729
1047
flags,
730
void* userdata) {
731
mandos_context *mc = userdata;
732
assert(r);
1048
void* mc){
1049
if(r == NULL){
1050
return;
1051
}
733
1052
734
1053
/* Called whenever a service has been resolved successfully or
735
1054
timed out */
736
1055
737
switch (event) {
1056
if(quit_now){
1057
return;
1058
}
1059
1060
switch(event){
738
1061
default:
739
1062
case AVAHI_RESOLVER_FAILURE:
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)));
1063
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1064
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1065
domain,
1066
avahi_strerror(avahi_server_errno
1067
(((mandos_context*)mc)->server)));
743
1068
break;
744
1069
745
1070
case AVAHI_RESOLVER_FOUND:
747
1072
char ip[AVAHI_ADDRESS_STR_MAX];
748
1073
avahi_address_snprint(ip, sizeof(ip), address);
749
1074
if(debug){
750
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
751
PRIu16 ") on port %d\n", name, host_name, ip,
752
interface, port);
1075
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1076
PRIdMAX ") on port %" PRIu16 "\n", name,
1077
host_name, ip, (intmax_t)interface, port);
753
1078
}
754
int ret = start_mandos_communication(ip, port, interface, mc);
755
if (ret == 0){
756
avahi_simple_poll_quit(mc->simple_poll);
1079
int ret = start_mandos_communication(ip, (in_port_t)port,
1080
interface,
1081
avahi_proto_to_af(proto),
1082
mc);
1083
if(ret == 0){
1084
avahi_simple_poll_quit(simple_poll);
1085
} else {
1086
if(not add_server(ip, (in_port_t)port, interface,
1087
avahi_proto_to_af(proto),
1088
&((mandos_context*)mc)->current_server)){
1089
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1090
" list\n", name);
1091
}
757
1092
}
758
1093
}
759
1094
}
760
1095
avahi_s_service_resolver_free(r);
761
1096
}
762
1097
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;
774
assert(b);
1098
static void browse_callback(AvahiSServiceBrowser *b,
1099
AvahiIfIndex interface,
1100
AvahiProtocol protocol,
1101
AvahiBrowserEvent event,
1102
const char *name,
1103
const char *type,
1104
const char *domain,
1105
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1106
flags,
1107
void* mc){
1108
if(b == NULL){
1109
return;
1110
}
775
1111
776
1112
/* Called whenever a new services becomes available on the LAN or
777
1113
is removed from the LAN */
778
1114
779
switch (event) {
1115
if(quit_now){
1116
return;
1117
}
1118
1119
switch(event){
780
1120
default:
781
1121
case AVAHI_BROWSER_FAILURE:
782
1122
783
fprintf(stderr, "(Avahi browser) %s\n",
784
avahi_strerror(avahi_server_errno(mc->server)));
785
avahi_simple_poll_quit(mc->simple_poll);
1123
fprintf_plus(stderr, "(Avahi browser) %s\n",
1124
avahi_strerror(avahi_server_errno
1125
(((mandos_context*)mc)->server)));
1126
avahi_simple_poll_quit(simple_poll);
786
1127
return;
787
1128
788
1129
case AVAHI_BROWSER_NEW:
791
1132
the callback function is called the Avahi server will free the
792
1133
resolver for us. */
793
1134
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)));
1135
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1136
interface, protocol, name, type,
1137
domain, protocol, 0,
1138
resolve_callback, mc) == NULL)
1139
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1140
" %s\n", name,
1141
avahi_strerror(avahi_server_errno
1142
(((mandos_context*)mc)->server)));
800
1143
break;
801
1144
802
1145
case AVAHI_BROWSER_REMOVE:
805
1148
case AVAHI_BROWSER_ALL_FOR_NOW:
806
1149
case AVAHI_BROWSER_CACHE_EXHAUSTED:
807
1150
if(debug){
808
fprintf(stderr, "No Mandos server found, still searching...\n");
1151
fprintf_plus(stderr, "No Mandos server found, still"
1152
" searching...\n");
809
1153
}
810
1154
break;
811
1155
}
812
1156
}
813
1157
1158
/* Signal handler that stops main loop after SIGTERM */
1159
static void handle_sigterm(int sig){
1160
if(quit_now){
1161
return;
1162
}
1163
quit_now = 1;
1164
signal_received = sig;
1165
int old_errno = errno;
1166
/* set main loop to exit */
1167
if(simple_poll != NULL){
1168
avahi_simple_poll_quit(simple_poll);
1169
}
1170
errno = old_errno;
1171
}
1172
1173
bool get_flags(const char *ifname, struct ifreq *ifr){
1174
int ret;
1175
error_t ret_errno;
1176
1177
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1178
if(s < 0){
1179
ret_errno = errno;
1180
perror_plus("socket");
1181
errno = ret_errno;
1182
return false;
1183
}
1184
strcpy(ifr->ifr_name, ifname);
1185
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1186
if(ret == -1){
1187
if(debug){
1188
ret_errno = errno;
1189
perror_plus("ioctl SIOCGIFFLAGS");
1190
errno = ret_errno;
1191
}
1192
return false;
1193
}
1194
return true;
1195
}
1196
1197
bool good_flags(const char *ifname, const struct ifreq *ifr){
1198
1199
/* Reject the loopback device */
1200
if(ifr->ifr_flags & IFF_LOOPBACK){
1201
if(debug){
1202
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1203
ifname);
1204
}
1205
return false;
1206
}
1207
/* Accept point-to-point devices only if connect_to is specified */
1208
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1209
if(debug){
1210
fprintf_plus(stderr, "Accepting point-to-point interface"
1211
" \"%s\"\n", ifname);
1212
}
1213
return true;
1214
}
1215
/* Otherwise, reject non-broadcast-capable devices */
1216
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1217
if(debug){
1218
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1219
" \"%s\"\n", ifname);
1220
}
1221
return false;
1222
}
1223
/* Reject non-ARP interfaces (including dummy interfaces) */
1224
if(ifr->ifr_flags & IFF_NOARP){
1225
if(debug){
1226
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1227
ifname);
1228
}
1229
return false;
1230
}
1231
1232
/* Accept this device */
1233
if(debug){
1234
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1235
}
1236
return true;
1237
}
1238
1239
/*
1240
* This function determines if a directory entry in /sys/class/net
1241
* corresponds to an acceptable network device.
1242
* (This function is passed to scandir(3) as a filter function.)
1243
*/
1244
int good_interface(const struct dirent *if_entry){
1245
if(if_entry->d_name[0] == '.'){
1246
return 0;
1247
}
1248
1249
struct ifreq ifr;
1250
if(not get_flags(if_entry->d_name, &ifr)){
1251
if(debug){
1252
fprintf_plus(stderr, "Failed to get flags for interface "
1253
"\"%s\"\n", if_entry->d_name);
1254
}
1255
return 0;
1256
}
1257
1258
if(not good_flags(if_entry->d_name, &ifr)){
1259
return 0;
1260
}
1261
return 1;
1262
}
1263
1264
/*
1265
* This function determines if a network interface is up.
1266
*/
1267
bool interface_is_up(const char *interface){
1268
struct ifreq ifr;
1269
if(not get_flags(interface, &ifr)){
1270
if(debug){
1271
fprintf_plus(stderr, "Failed to get flags for interface "
1272
"\"%s\"\n", interface);
1273
}
1274
return false;
1275
}
1276
1277
return (bool)(ifr.ifr_flags & IFF_UP);
1278
}
1279
1280
/*
1281
* This function determines if a network interface is running
1282
*/
1283
bool interface_is_running(const char *interface){
1284
struct ifreq ifr;
1285
if(not get_flags(interface, &ifr)){
1286
if(debug){
1287
fprintf_plus(stderr, "Failed to get flags for interface "
1288
"\"%s\"\n", interface);
1289
}
1290
return false;
1291
}
1292
1293
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1294
}
1295
1296
int notdotentries(const struct dirent *direntry){
1297
/* Skip "." and ".." */
1298
if(direntry->d_name[0] == '.'
1299
and (direntry->d_name[1] == '\0'
1300
or (direntry->d_name[1] == '.'
1301
and direntry->d_name[2] == '\0'))){
1302
return 0;
1303
}
1304
return 1;
1305
}
1306
1307
/* Is this directory entry a runnable program? */
1308
int runnable_hook(const struct dirent *direntry){
1309
int ret;
1310
size_t sret;
1311
struct stat st;
1312
1313
if((direntry->d_name)[0] == '\0'){
1314
/* Empty name? */
1315
return 0;
1316
}
1317
1318
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1319
"abcdefghijklmnopqrstuvwxyz"
1320
"0123456789"
1321
"_-");
1322
if((direntry->d_name)[sret] != '\0'){
1323
/* Contains non-allowed characters */
1324
if(debug){
1325
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1326
direntry->d_name);
1327
}
1328
return 0;
1329
}
1330
1331
char *fullname = NULL;
1332
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1333
if(ret < 0){
1334
perror_plus("asprintf");
1335
return 0;
1336
}
1337
1338
ret = stat(fullname, &st);
1339
if(ret == -1){
1340
if(debug){
1341
perror_plus("Could not stat hook");
1342
}
1343
return 0;
1344
}
1345
if(not (S_ISREG(st.st_mode))){
1346
/* Not a regular file */
1347
if(debug){
1348
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1349
direntry->d_name);
1350
}
1351
return 0;
1352
}
1353
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1354
/* Not executable */
1355
if(debug){
1356
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1357
direntry->d_name);
1358
}
1359
return 0;
1360
}
1361
if(debug){
1362
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1363
direntry->d_name);
1364
}
1365
return 1;
1366
}
1367
1368
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1369
mandos_context *mc){
1370
int ret;
1371
struct timespec now;
1372
struct timespec waited_time;
1373
intmax_t block_time;
1374
1375
while(true){
1376
if(mc->current_server == NULL){
1377
if (debug){
1378
fprintf_plus(stderr, "Wait until first server is found."
1379
" No timeout!\n");
1380
}
1381
ret = avahi_simple_poll_iterate(s, -1);
1382
} else {
1383
if (debug){
1384
fprintf_plus(stderr, "Check current_server if we should run"
1385
" it, or wait\n");
1386
}
1387
/* the current time */
1388
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1389
if(ret == -1){
1390
perror_plus("clock_gettime");
1391
return -1;
1392
}
1393
/* Calculating in ms how long time between now and server
1394
who we visted longest time ago. Now - last seen. */
1395
waited_time.tv_sec = (now.tv_sec
1396
- mc->current_server->last_seen.tv_sec);
1397
waited_time.tv_nsec = (now.tv_nsec
1398
- mc->current_server->last_seen.tv_nsec);
1399
/* total time is 10s/10,000ms.
1400
Converting to s from ms by dividing by 1,000,
1401
and ns to ms by dividing by 1,000,000. */
1402
block_time = ((retry_interval
1403
- ((intmax_t)waited_time.tv_sec * 1000))
1404
- ((intmax_t)waited_time.tv_nsec / 1000000));
1405
1406
if (debug){
1407
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1408
block_time);
1409
}
1410
1411
if(block_time <= 0){
1412
ret = start_mandos_communication(mc->current_server->ip,
1413
mc->current_server->port,
1414
mc->current_server->if_index,
1415
mc->current_server->af, mc);
1416
if(ret == 0){
1417
avahi_simple_poll_quit(s);
1418
return 0;
1419
}
1420
ret = clock_gettime(CLOCK_MONOTONIC,
1421
&mc->current_server->last_seen);
1422
if(ret == -1){
1423
perror_plus("clock_gettime");
1424
return -1;
1425
}
1426
mc->current_server = mc->current_server->next;
1427
block_time = 0; /* Call avahi to find new Mandos
1428
servers, but don't block */
1429
}
1430
1431
ret = avahi_simple_poll_iterate(s, (int)block_time);
1432
}
1433
if(ret != 0){
1434
if (ret > 0 or errno != EINTR){
1435
return (ret != 1) ? ret : 0;
1436
}
1437
}
1438
}
1439
}
1440
1441
/* Set effective uid to 0, return errno */
1442
error_t raise_privileges(void){
1443
error_t old_errno = errno;
1444
error_t ret_errno = 0;
1445
if(seteuid(0) == -1){
1446
ret_errno = errno;
1447
perror_plus("seteuid");
1448
}
1449
errno = old_errno;
1450
return ret_errno;
1451
}
1452
1453
/* Set effective and real user ID to 0. Return errno. */
1454
error_t raise_privileges_permanently(void){
1455
error_t old_errno = errno;
1456
error_t ret_errno = raise_privileges();
1457
if(ret_errno != 0){
1458
errno = old_errno;
1459
return ret_errno;
1460
}
1461
if(setuid(0) == -1){
1462
ret_errno = errno;
1463
perror_plus("seteuid");
1464
}
1465
errno = old_errno;
1466
return ret_errno;
1467
}
1468
1469
/* Set effective user ID to unprivileged saved user ID */
1470
error_t lower_privileges(void){
1471
error_t old_errno = errno;
1472
error_t ret_errno = 0;
1473
if(seteuid(uid) == -1){
1474
ret_errno = errno;
1475
perror_plus("seteuid");
1476
}
1477
errno = old_errno;
1478
return ret_errno;
1479
}
1480
1481
/* Lower privileges permanently */
1482
error_t lower_privileges_permanently(void){
1483
error_t old_errno = errno;
1484
error_t ret_errno = 0;
1485
if(setuid(uid) == -1){
1486
ret_errno = errno;
1487
perror_plus("setuid");
1488
}
1489
errno = old_errno;
1490
return ret_errno;
1491
}
1492
1493
bool run_network_hooks(const char *mode, const char *interface,
1494
const float delay){
1495
struct dirent **direntries;
1496
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1497
alphasort);
1498
if(numhooks == -1){
1499
if(errno == ENOENT){
1500
if(debug){
1501
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1502
" found\n", hookdir);
1503
}
1504
} else {
1505
perror_plus("scandir");
1506
}
1507
} else {
1508
struct dirent *direntry;
1509
int ret;
1510
int devnull = open("/dev/null", O_RDONLY);
1511
for(int i = 0; i < numhooks; i++){
1512
direntry = direntries[i];
1513
char *fullname = NULL;
1514
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1515
if(ret < 0){
1516
perror_plus("asprintf");
1517
continue;
1518
}
1519
if(debug){
1520
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1521
direntry->d_name);
1522
}
1523
pid_t hook_pid = fork();
1524
if(hook_pid == 0){
1525
/* Child */
1526
/* Raise privileges */
1527
raise_privileges_permanently();
1528
/* Set group */
1529
errno = 0;
1530
ret = setgid(0);
1531
if(ret == -1){
1532
perror_plus("setgid");
1533
}
1534
/* Reset supplementary groups */
1535
errno = 0;
1536
ret = setgroups(0, NULL);
1537
if(ret == -1){
1538
perror_plus("setgroups");
1539
}
1540
dup2(devnull, STDIN_FILENO);
1541
close(devnull);
1542
dup2(STDERR_FILENO, STDOUT_FILENO);
1543
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1544
if(ret == -1){
1545
perror_plus("setenv");
1546
_exit(EX_OSERR);
1547
}
1548
ret = setenv("DEVICE", interface, 1);
1549
if(ret == -1){
1550
perror_plus("setenv");
1551
_exit(EX_OSERR);
1552
}
1553
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1554
if(ret == -1){
1555
perror_plus("setenv");
1556
_exit(EX_OSERR);
1557
}
1558
ret = setenv("MODE", mode, 1);
1559
if(ret == -1){
1560
perror_plus("setenv");
1561
_exit(EX_OSERR);
1562
}
1563
char *delaystring;
1564
ret = asprintf(&delaystring, "%f", delay);
1565
if(ret == -1){
1566
perror_plus("asprintf");
1567
_exit(EX_OSERR);
1568
}
1569
ret = setenv("DELAY", delaystring, 1);
1570
if(ret == -1){
1571
free(delaystring);
1572
perror_plus("setenv");
1573
_exit(EX_OSERR);
1574
}
1575
free(delaystring);
1576
if(connect_to != NULL){
1577
ret = setenv("CONNECT", connect_to, 1);
1578
if(ret == -1){
1579
perror_plus("setenv");
1580
_exit(EX_OSERR);
1581
}
1582
}
1583
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1584
perror_plus("execl");
1585
_exit(EXIT_FAILURE);
1586
}
1587
} else {
1588
int status;
1589
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1590
perror_plus("waitpid");
1591
free(fullname);
1592
continue;
1593
}
1594
if(WIFEXITED(status)){
1595
if(WEXITSTATUS(status) != 0){
1596
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1597
" with status %d\n", direntry->d_name,
1598
WEXITSTATUS(status));
1599
free(fullname);
1600
continue;
1601
}
1602
} else if(WIFSIGNALED(status)){
1603
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1604
" signal %d\n", direntry->d_name,
1605
WTERMSIG(status));
1606
free(fullname);
1607
continue;
1608
} else {
1609
fprintf_plus(stderr, "Warning: network hook \"%s\""
1610
" crashed\n", direntry->d_name);
1611
free(fullname);
1612
continue;
1613
}
1614
}
1615
free(fullname);
1616
if(debug){
1617
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1618
direntry->d_name);
1619
}
1620
}
1621
close(devnull);
1622
}
1623
return true;
1624
}
1625
1626
error_t bring_up_interface(const char *const interface,
1627
const float delay){
1628
int sd = -1;
1629
error_t old_errno = errno;
1630
error_t ret_errno = 0;
1631
int ret, ret_setflags;
1632
struct ifreq network;
1633
unsigned int if_index = if_nametoindex(interface);
1634
if(if_index == 0){
1635
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1636
errno = old_errno;
1637
return ENXIO;
1638
}
1639
1640
if(quit_now){
1641
errno = old_errno;
1642
return EINTR;
1643
}
1644
1645
if(not interface_is_up(interface)){
1646
if(not get_flags(interface, &network) and debug){
1647
ret_errno = errno;
1648
fprintf_plus(stderr, "Failed to get flags for interface "
1649
"\"%s\"\n", interface);
1650
return ret_errno;
1651
}
1652
network.ifr_flags |= IFF_UP;
1653
1654
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1655
if(sd < 0){
1656
ret_errno = errno;
1657
perror_plus("socket");
1658
errno = old_errno;
1659
return ret_errno;
1660
}
1661
1662
if(quit_now){
1663
close(sd);
1664
errno = old_errno;
1665
return EINTR;
1666
}
1667
1668
if(debug){
1669
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1670
interface);
1671
}
1672
1673
/* Raise priviliges */
1674
raise_privileges();
1675
1676
#ifdef __linux__
1677
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1678
messages about the network interface to mess up the prompt */
1679
int ret_linux = klogctl(8, NULL, 5);
1680
bool restore_loglevel = true;
1681
if(ret_linux == -1){
1682
restore_loglevel = false;
1683
perror_plus("klogctl");
1684
}
1685
#endif /* __linux__ */
1686
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1687
ret_errno = errno;
1688
#ifdef __linux__
1689
if(restore_loglevel){
1690
ret_linux = klogctl(7, NULL, 0);
1691
if(ret_linux == -1){
1692
perror_plus("klogctl");
1693
}
1694
}
1695
#endif /* __linux__ */
1696
1697
/* Lower privileges */
1698
lower_privileges();
1699
1700
/* Close the socket */
1701
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1702
if(ret == -1){
1703
perror_plus("close");
1704
}
1705
1706
if(ret_setflags == -1){
1707
errno = ret_errno;
1708
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1709
errno = old_errno;
1710
return ret_errno;
1711
}
1712
} else if(debug){
1713
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1714
interface);
1715
}
1716
1717
/* Sleep checking until interface is running.
1718
Check every 0.25s, up to total time of delay */
1719
for(int i=0; i < delay * 4; i++){
1720
if(interface_is_running(interface)){
1721
break;
1722
}
1723
struct timespec sleeptime = { .tv_nsec = 250000000 };
1724
ret = nanosleep(&sleeptime, NULL);
1725
if(ret == -1 and errno != EINTR){
1726
perror_plus("nanosleep");
1727
}
1728
}
1729
1730
errno = old_errno;
1731
return 0;
1732
}
1733
1734
error_t take_down_interface(const char *const interface){
1735
error_t old_errno = errno;
1736
struct ifreq network;
1737
unsigned int if_index = if_nametoindex(interface);
1738
if(if_index == 0){
1739
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1740
errno = old_errno;
1741
return ENXIO;
1742
}
1743
if(interface_is_up(interface)){
1744
error_t ret_errno = 0;
1745
if(not get_flags(interface, &network) and debug){
1746
ret_errno = errno;
1747
fprintf_plus(stderr, "Failed to get flags for interface "
1748
"\"%s\"\n", interface);
1749
return ret_errno;
1750
}
1751
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1752
1753
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1754
if(sd < 0){
1755
ret_errno = errno;
1756
perror_plus("socket");
1757
errno = old_errno;
1758
return ret_errno;
1759
}
1760
1761
if(debug){
1762
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1763
interface);
1764
}
1765
1766
/* Raise priviliges */
1767
raise_privileges();
1768
1769
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1770
ret_errno = errno;
1771
1772
/* Lower privileges */
1773
lower_privileges();
1774
1775
/* Close the socket */
1776
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1777
if(ret == -1){
1778
perror_plus("close");
1779
}
1780
1781
if(ret_setflags == -1){
1782
errno = ret_errno;
1783
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1784
errno = old_errno;
1785
return ret_errno;
1786
}
1787
} else if(debug){
1788
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1789
interface);
1790
}
1791
1792
errno = old_errno;
1793
return 0;
1794
}
1795
814
1796
int main(int argc, char *argv[]){
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);
931
ret = ioctl(sd, SIOCGIFFLAGS, &network);
932
if(ret == -1){
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;
939
ret = ioctl(sd, SIOCSIFFLAGS, &network);
940
if(ret == -1){
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
}
1797
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1798
.priority = "SECURE256:!CTYPE-X.509:"
1799
"+CTYPE-OPENPGP", .current_server = NULL,
1800
.interfaces = NULL, .interfaces_size = 0 };
1801
AvahiSServiceBrowser *sb = NULL;
1802
error_t ret_errno;
1803
int ret;
1804
intmax_t tmpmax;
1805
char *tmp;
1806
int exitcode = EXIT_SUCCESS;
1807
char *interfaces_to_take_down = NULL;
1808
size_t interfaces_to_take_down_size = 0;
1809
char tempdir[] = "/tmp/mandosXXXXXX";
1810
bool tempdir_created = false;
1811
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1812
const char *seckey = PATHDIR "/" SECKEY;
1813
const char *pubkey = PATHDIR "/" PUBKEY;
1814
char *interfaces_hooks = NULL;
1815
1816
bool gnutls_initialized = false;
1817
bool gpgme_initialized = false;
1818
float delay = 2.5f;
1819
double retry_interval = 10; /* 10s between trying a server and
1820
retrying the same server again */
1821
1822
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1823
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1824
1825
uid = getuid();
1826
gid = getgid();
1827
1828
/* Lower any group privileges we might have, just to be safe */
1829
errno = 0;
1830
ret = setgid(gid);
1831
if(ret == -1){
1832
perror_plus("setgid");
1833
}
1834
1835
/* Lower user privileges (temporarily) */
1836
errno = 0;
1837
ret = seteuid(uid);
1838
if(ret == -1){
1839
perror_plus("seteuid");
1840
}
1841
1842
if(quit_now){
1843
goto end;
1844
}
1845
1846
{
1847
struct argp_option options[] = {
1848
{ .name = "debug", .key = 128,
1849
.doc = "Debug mode", .group = 3 },
1850
{ .name = "connect", .key = 'c',
1851
.arg = "ADDRESS:PORT",
1852
.doc = "Connect directly to a specific Mandos server",
1853
.group = 1 },
1854
{ .name = "interface", .key = 'i',
1855
.arg = "NAME",
1856
.doc = "Network interface that will be used to search for"
1857
" Mandos servers",
1858
.group = 1 },
1859
{ .name = "seckey", .key = 's',
1860
.arg = "FILE",
1861
.doc = "OpenPGP secret key file base name",
1862
.group = 1 },
1863
{ .name = "pubkey", .key = 'p',
1864
.arg = "FILE",
1865
.doc = "OpenPGP public key file base name",
1866
.group = 2 },
1867
{ .name = "dh-bits", .key = 129,
1868
.arg = "BITS",
1869
.doc = "Bit length of the prime number used in the"
1870
" Diffie-Hellman key exchange",
1871
.group = 2 },
1872
{ .name = "priority", .key = 130,
1873
.arg = "STRING",
1874
.doc = "GnuTLS priority string for the TLS handshake",
1875
.group = 1 },
1876
{ .name = "delay", .key = 131,
1877
.arg = "SECONDS",
1878
.doc = "Maximum delay to wait for interface startup",
1879
.group = 2 },
1880
{ .name = "retry", .key = 132,
1881
.arg = "SECONDS",
1882
.doc = "Retry interval used when denied by the Mandos server",
1883
.group = 2 },
1884
{ .name = "network-hook-dir", .key = 133,
1885
.arg = "DIR",
1886
.doc = "Directory where network hooks are located",
1887
.group = 2 },
1888
/*
1889
* These reproduce what we would get without ARGP_NO_HELP
1890
*/
1891
{ .name = "help", .key = '?',
1892
.doc = "Give this help list", .group = -1 },
1893
{ .name = "usage", .key = -3,
1894
.doc = "Give a short usage message", .group = -1 },
1895
{ .name = "version", .key = 'V',
1896
.doc = "Print program version", .group = -1 },
1897
{ .name = NULL }
1898
};
1899
1900
error_t parse_opt(int key, char *arg,
1901
struct argp_state *state){
1003
1902
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;
1903
switch(key){
1904
case 128: /* --debug */
1905
debug = true;
1906
break;
1907
case 'c': /* --connect */
1908
connect_to = arg;
1909
break;
1910
case 'i': /* --interface */
1911
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1912
arg, (int)',');
1913
if(ret_errno != 0){
1914
argp_error(state, "%s", strerror(ret_errno));
1915
}
1916
break;
1917
case 's': /* --seckey */
1918
seckey = arg;
1919
break;
1920
case 'p': /* --pubkey */
1921
pubkey = arg;
1922
break;
1923
case 129: /* --dh-bits */
1924
errno = 0;
1925
tmpmax = strtoimax(arg, &tmp, 10);
1926
if(errno != 0 or tmp == arg or *tmp != '\0'
1927
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1928
argp_error(state, "Bad number of DH bits");
1929
}
1930
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1931
break;
1932
case 130: /* --priority */
1933
mc.priority = arg;
1934
break;
1935
case 131: /* --delay */
1936
errno = 0;
1937
delay = strtof(arg, &tmp);
1938
if(errno != 0 or tmp == arg or *tmp != '\0'){
1939
argp_error(state, "Bad delay");
1940
}
1941
case 132: /* --retry */
1942
errno = 0;
1943
retry_interval = strtod(arg, &tmp);
1944
if(errno != 0 or tmp == arg or *tmp != '\0'
1945
or (retry_interval * 1000) > INT_MAX
1946
or retry_interval < 0){
1947
argp_error(state, "Bad retry interval");
1948
}
1949
break;
1950
case 133: /* --network-hook-dir */
1951
hookdir = arg;
1952
break;
1953
/*
1954
* These reproduce what we would get without ARGP_NO_HELP
1955
*/
1956
case '?': /* --help */
1957
argp_state_help(state, state->out_stream,
1958
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1959
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1960
case -3: /* --usage */
1961
argp_state_help(state, state->out_stream,
1962
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1963
case 'V': /* --version */
1964
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1965
exit(argp_err_exit_status);
1966
break;
1967
default:
1968
return ARGP_ERR_UNKNOWN;
1969
}
1970
return errno;
1971
}
1972
1973
struct argp argp = { .options = options, .parser = parse_opt,
1974
.args_doc = "",
1975
.doc = "Mandos client -- Get and decrypt"
1976
" passwords from a Mandos server" };
1977
ret = argp_parse(&argp, argc, argv,
1978
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1979
switch(ret){
1980
case 0:
1981
break;
1982
case ENOMEM:
1983
default:
1984
errno = ret;
1985
perror_plus("argp_parse");
1986
exitcode = EX_OSERR;
1987
goto end;
1988
case EINVAL:
1989
exitcode = EX_USAGE;
1990
goto end;
1991
}
1992
}
1993
1994
{
1995
/* Work around Debian bug #633582:
1996
<http://bugs.debian.org/633582> */
1997
1998
/* Re-raise priviliges */
1999
if(raise_privileges() == 0){
2000
struct stat st;
2001
2002
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2003
int seckey_fd = open(seckey, O_RDONLY);
2004
if(seckey_fd == -1){
2005
perror_plus("open");
2006
} else {
2007
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2008
if(ret == -1){
2009
perror_plus("fstat");
2010
} else {
2011
if(S_ISREG(st.st_mode)
2012
and st.st_uid == 0 and st.st_gid == 0){
2013
ret = fchown(seckey_fd, uid, gid);
2014
if(ret == -1){
2015
perror_plus("fchown");
2016
}
2017
}
2018
}
2019
TEMP_FAILURE_RETRY(close(seckey_fd));
2020
}
2021
}
2022
2023
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2024
int pubkey_fd = open(pubkey, O_RDONLY);
2025
if(pubkey_fd == -1){
2026
perror_plus("open");
2027
} else {
2028
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2029
if(ret == -1){
2030
perror_plus("fstat");
2031
} else {
2032
if(S_ISREG(st.st_mode)
2033
and st.st_uid == 0 and st.st_gid == 0){
2034
ret = fchown(pubkey_fd, uid, gid);
2035
if(ret == -1){
2036
perror_plus("fchown");
2037
}
2038
}
2039
}
2040
TEMP_FAILURE_RETRY(close(pubkey_fd));
2041
}
2042
}
2043
2044
/* Lower privileges */
2045
lower_privileges();
2046
}
2047
}
2048
2049
/* Remove invalid interface names (except "none") */
2050
{
2051
char *interface = NULL;
2052
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2053
interface))){
2054
if(strcmp(interface, "none") != 0
2055
and if_nametoindex(interface) == 0){
2056
if(interface[0] != '\0'){
2057
fprintf_plus(stderr, "Not using nonexisting interface"
2058
" \"%s\"\n", interface);
2059
}
2060
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2061
interface = NULL;
2062
}
2063
}
2064
}
2065
2066
/* Run network hooks */
2067
{
2068
if(mc.interfaces != NULL){
2069
interfaces_hooks = malloc(mc.interfaces_size);
2070
if(interfaces_hooks == NULL){
2071
perror_plus("malloc");
1008
2072
goto end;
1009
2073
}
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
2074
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2075
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2076
}
2077
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2078
interfaces_hooks : "", delay)){
2079
goto end;
2080
}
2081
}
2082
2083
if(not debug){
2084
avahi_set_log_function(empty_log);
2085
}
2086
2087
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2088
from the signal handler */
2089
/* Initialize the pseudo-RNG for Avahi */
2090
srand((unsigned int) time(NULL));
2091
simple_poll = avahi_simple_poll_new();
2092
if(simple_poll == NULL){
2093
fprintf_plus(stderr,
2094
"Avahi: Failed to create simple poll object.\n");
2095
exitcode = EX_UNAVAILABLE;
2096
goto end;
2097
}
2098
2099
sigemptyset(&sigterm_action.sa_mask);
2100
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2101
if(ret == -1){
2102
perror_plus("sigaddset");
2103
exitcode = EX_OSERR;
2104
goto end;
2105
}
2106
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2107
if(ret == -1){
2108
perror_plus("sigaddset");
2109
exitcode = EX_OSERR;
2110
goto end;
2111
}
2112
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2113
if(ret == -1){
2114
perror_plus("sigaddset");
2115
exitcode = EX_OSERR;
2116
goto end;
2117
}
2118
/* Need to check if the handler is SIG_IGN before handling:
2119
| [[info:libc:Initial Signal Actions]] |
2120
| [[info:libc:Basic Signal Handling]] |
2121
*/
2122
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2123
if(ret == -1){
2124
perror_plus("sigaction");
2125
return EX_OSERR;
2126
}
2127
if(old_sigterm_action.sa_handler != SIG_IGN){
2128
ret = sigaction(SIGINT, &sigterm_action, NULL);
2129
if(ret == -1){
2130
perror_plus("sigaction");
2131
exitcode = EX_OSERR;
2132
goto end;
2133
}
2134
}
2135
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2136
if(ret == -1){
2137
perror_plus("sigaction");
2138
return EX_OSERR;
2139
}
2140
if(old_sigterm_action.sa_handler != SIG_IGN){
2141
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2142
if(ret == -1){
2143
perror_plus("sigaction");
2144
exitcode = EX_OSERR;
2145
goto end;
2146
}
2147
}
2148
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2149
if(ret == -1){
2150
perror_plus("sigaction");
2151
return EX_OSERR;
2152
}
2153
if(old_sigterm_action.sa_handler != SIG_IGN){
2154
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2155
if(ret == -1){
2156
perror_plus("sigaction");
2157
exitcode = EX_OSERR;
2158
goto end;
2159
}
2160
}
2161
2162
/* If no interfaces were specified, make a list */
2163
if(mc.interfaces == NULL){
2164
struct dirent **direntries;
2165
/* Look for any good interfaces */
2166
ret = scandir(sys_class_net, &direntries, good_interface,
2167
alphasort);
2168
if(ret >= 1){
2169
/* Add all found interfaces to interfaces list */
2170
for(int i = 0; i < ret; ++i){
2171
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2172
direntries[i]->d_name);
2173
if(ret_errno != 0){
2174
errno = ret_errno;
2175
perror_plus("argz_add");
2176
continue;
2177
}
2178
if(debug){
2179
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2180
direntries[i]->d_name);
2181
}
2182
}
2183
free(direntries);
2184
} else {
2185
free(direntries);
2186
fprintf_plus(stderr, "Could not find a network interface\n");
2187
exitcode = EXIT_FAILURE;
2188
goto end;
2189
}
2190
}
2191
2192
/* Bring up interfaces which are down, and remove any "none"s */
2193
{
2194
char *interface = NULL;
2195
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2196
interface))){
2197
/* If interface name is "none", stop bringing up interfaces.
2198
Also remove all instances of "none" from the list */
2199
if(strcmp(interface, "none") == 0){
2200
argz_delete(&mc.interfaces, &mc.interfaces_size,
2201
interface);
2202
interface = NULL;
2203
while((interface = argz_next(mc.interfaces,
2204
mc.interfaces_size, interface))){
2205
if(strcmp(interface, "none") == 0){
2206
argz_delete(&mc.interfaces, &mc.interfaces_size,
2207
interface);
2208
interface = NULL;
2209
}
2210
}
2211
break;
2212
}
2213
bool interface_was_up = interface_is_up(interface);
2214
ret = bring_up_interface(interface, delay);
2215
if(not interface_was_up){
2216
if(ret != 0){
2217
errno = ret;
2218
perror_plus("Failed to bring up interface");
2219
} else {
2220
ret_errno = argz_add(&interfaces_to_take_down,
2221
&interfaces_to_take_down_size,
2222
interface);
2223
if(ret_errno != 0){
2224
errno = ret_errno;
2225
perror_plus("argz_add");
2226
}
2227
}
2228
}
2229
}
2230
if(debug and (interfaces_to_take_down == NULL)){
2231
fprintf_plus(stderr, "No interfaces were brought up\n");
2232
}
2233
}
2234
2235
/* If we only got one interface, explicitly use only that one */
2236
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2237
if(debug){
2238
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2239
mc.interfaces);
2240
}
2241
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2242
}
2243
2244
if(quit_now){
2245
goto end;
2246
}
2247
2248
ret = init_gnutls_global(pubkey, seckey, &mc);
2249
if(ret == -1){
2250
fprintf_plus(stderr, "init_gnutls_global failed\n");
2251
exitcode = EX_UNAVAILABLE;
2252
goto end;
2253
} else {
2254
gnutls_initialized = true;
2255
}
2256
2257
if(quit_now){
2258
goto end;
2259
}
2260
2261
if(mkdtemp(tempdir) == NULL){
2262
perror_plus("mkdtemp");
2263
goto end;
2264
}
2265
tempdir_created = true;
2266
2267
if(quit_now){
2268
goto end;
2269
}
2270
2271
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2272
fprintf_plus(stderr, "init_gpgme failed\n");
2273
exitcode = EX_UNAVAILABLE;
2274
goto end;
2275
} else {
2276
gpgme_initialized = true;
2277
}
2278
2279
if(quit_now){
2280
goto end;
2281
}
2282
2283
if(connect_to != NULL){
2284
/* Connect directly, do not use Zeroconf */
2285
/* (Mainly meant for debugging) */
2286
char *address = strrchr(connect_to, ':');
2287
2288
if(address == NULL){
2289
fprintf_plus(stderr, "No colon in address\n");
2290
exitcode = EX_USAGE;
2291
goto end;
2292
}
2293
2294
if(quit_now){
2295
goto end;
2296
}
2297
2298
in_port_t port;
2299
errno = 0;
2300
tmpmax = strtoimax(address+1, &tmp, 10);
2301
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2302
or tmpmax != (in_port_t)tmpmax){
2303
fprintf_plus(stderr, "Bad port number\n");
2304
exitcode = EX_USAGE;
2305
goto end;
2306
}
2307
2308
if(quit_now){
2309
goto end;
2310
}
2311
2312
port = (in_port_t)tmpmax;
2313
*address = '\0';
2314
/* Colon in address indicates IPv6 */
2315
int af;
2316
if(strchr(connect_to, ':') != NULL){
2317
af = AF_INET6;
2318
/* Accept [] around IPv6 address - see RFC 5952 */
2319
if(connect_to[0] == '[' and address[-1] == ']')
2320
{
2321
connect_to++;
2322
address[-1] = '\0';
2323
}
2324
} else {
2325
af = AF_INET;
2326
}
2327
address = connect_to;
2328
2329
if(quit_now){
2330
goto end;
2331
}
2332
2333
while(not quit_now){
2334
ret = start_mandos_communication(address, port, if_index, af,
2335
&mc);
2336
if(quit_now or ret == 0){
2337
break;
2338
}
2339
if(debug){
2340
fprintf_plus(stderr, "Retrying in %d seconds\n",
2341
(int)retry_interval);
2342
}
2343
sleep((unsigned int)retry_interval);
2344
}
2345
2346
if (not quit_now){
2347
exitcode = EXIT_SUCCESS;
2348
}
2349
2350
goto end;
2351
}
2352
2353
if(quit_now){
2354
goto end;
2355
}
2356
2357
{
2358
AvahiServerConfig config;
2359
/* Do not publish any local Zeroconf records */
2360
avahi_server_config_init(&config);
2361
config.publish_hinfo = 0;
2362
config.publish_addresses = 0;
2363
config.publish_workstation = 0;
2364
config.publish_domain = 0;
2365
2366
/* Allocate a new server */
2367
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2368
&config, NULL, NULL, &ret_errno);
2369
2370
/* Free the Avahi configuration data */
2371
avahi_server_config_free(&config);
2372
}
2373
2374
/* Check if creating the Avahi server object succeeded */
2375
if(mc.server == NULL){
2376
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2377
avahi_strerror(ret_errno));
2378
exitcode = EX_UNAVAILABLE;
2379
goto end;
2380
}
2381
2382
if(quit_now){
2383
goto end;
2384
}
2385
2386
/* Create the Avahi service browser */
2387
sb = avahi_s_service_browser_new(mc.server, if_index,
2388
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2389
NULL, 0, browse_callback,
2390
(void *)&mc);
2391
if(sb == NULL){
2392
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2393
avahi_strerror(avahi_server_errno(mc.server)));
2394
exitcode = EX_UNAVAILABLE;
2395
goto end;
2396
}
2397
2398
if(quit_now){
2399
goto end;
2400
}
2401
2402
/* Run the main loop */
2403
2404
if(debug){
2405
fprintf_plus(stderr, "Starting Avahi loop search\n");
2406
}
2407
2408
ret = avahi_loop_with_timeout(simple_poll,
2409
(int)(retry_interval * 1000), &mc);
2410
if(debug){
2411
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2412
(ret == 0) ? "successfully" : "with error");
2413
}
2414
1083
2415
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;
2416
2417
if(debug){
2418
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2419
}
2420
2421
/* Cleanup things */
2422
free(mc.interfaces);
2423
2424
if(sb != NULL)
2425
avahi_s_service_browser_free(sb);
2426
2427
if(mc.server != NULL)
2428
avahi_server_free(mc.server);
2429
2430
if(simple_poll != NULL)
2431
avahi_simple_poll_free(simple_poll);
2432
2433
if(gnutls_initialized){
2434
gnutls_certificate_free_credentials(mc.cred);
2435
gnutls_global_deinit();
2436
gnutls_dh_params_deinit(mc.dh_params);
2437
}
2438
2439
if(gpgme_initialized){
2440
gpgme_release(mc.ctx);
2441
}
2442
2443
/* Cleans up the circular linked list of Mandos servers the client
2444
has seen */
2445
if(mc.current_server != NULL){
2446
mc.current_server->prev->next = NULL;
2447
while(mc.current_server != NULL){
2448
server *next = mc.current_server->next;
2449
free(mc.current_server);
2450
mc.current_server = next;
2451
}
2452
}
2453
2454
/* Re-raise priviliges */
2455
{
2456
raise_privileges();
2457
2458
/* Run network hooks */
2459
run_network_hooks("stop", interfaces_hooks != NULL ?
2460
interfaces_hooks : "", delay);
2461
2462
/* Take down the network interfaces which were brought up */
2463
{
2464
char *interface = NULL;
2465
while((interface=argz_next(interfaces_to_take_down,
2466
interfaces_to_take_down_size,
2467
interface))){
2468
ret_errno = take_down_interface(interface);
2469
if(ret_errno != 0){
2470
errno = ret_errno;
2471
perror_plus("Failed to take down interface");
2472
}
2473
}
2474
if(debug and (interfaces_to_take_down == NULL)){
2475
fprintf_plus(stderr, "No interfaces needed to be taken"
2476
" down\n");
2477
}
2478
}
2479
2480
lower_privileges_permanently();
2481
}
2482
2483
free(interfaces_to_take_down);
2484
free(interfaces_hooks);
2485
2486
/* Removes the GPGME temp directory and all files inside */
2487
if(tempdir_created){
2488
struct dirent **direntries = NULL;
2489
struct dirent *direntry = NULL;
2490
int numentries = scandir(tempdir, &direntries, notdotentries,
2491
alphasort);
2492
if (numentries > 0){
2493
for(int i = 0; i < numentries; i++){
2494
direntry = direntries[i];
2495
char *fullname = NULL;
2496
ret = asprintf(&fullname, "%s/%s", tempdir,
2497
direntry->d_name);
2498
if(ret < 0){
2499
perror_plus("asprintf");
2500
continue;
2501
}
2502
ret = remove(fullname);
2503
if(ret == -1){
2504
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2505
strerror(errno));
2506
}
2507
free(fullname);
2508
}
2509
}
2510
2511
/* need to clean even if 0 because man page doesn't specify */
2512
free(direntries);
2513
if (numentries == -1){
2514
perror_plus("scandir");
2515
}
2516
ret = rmdir(tempdir);
2517
if(ret == -1 and errno != ENOENT){
2518
perror_plus("rmdir");
2519
}
2520
}
2521
2522
if(quit_now){
2523
sigemptyset(&old_sigterm_action.sa_mask);
2524
old_sigterm_action.sa_handler = SIG_DFL;
2525
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2526
&old_sigterm_action,
2527
NULL));
2528
if(ret == -1){
2529
perror_plus("sigaction");
2530
}
2531
do {
2532
ret = raise(signal_received);
2533
} while(ret != 0 and errno == EINTR);
2534
if(ret != 0){
2535
perror_plus("raise");
2536
abort();
2537
}
2538
TEMP_FAILURE_RETRY(pause());
2539
}
2540
2541
return exitcode;
1147
2542
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0