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237.7.152
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: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2012-06-17 02:30:59 UTC
- mto: (301.1.1 release) (237.7.272 trunk)
- mto: This revision was merged to the branch mainline in revision 302.
- Revision ID: teddy@recompile.se-20120617023059-em4nfnxg1tsn64xj
* plugins.d/mandos-client (start_mandos_communication): Bug fix; skip
non-specified
interfaces.
(main): Use lower_privileges() consistently. Bug fix: Don't remove
"none" from list of interfaces. Make --interface=none work
again by not bringing up interfaces specified after "none".
* plugins.d/mandos-client.xml (OPTIONS): Document new meaning of
specifying --interface=none
together with other
interface names,
non-specified
interfaces.
(main): Use lower_privileges() consistently. Bug fix: Don't remove
"none" from list of interfaces. Make --interface=none work
again by not bringing up interfaces specified after "none".
* plugins.d/mandos-client.xml (OPTIONS): Document new meaning of
specifying --interface=none
together with other
interface names,
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- network-hooks.d
- files removed:
- plugins.d/usplash
- files renamed:
- plugins.d/password-request.c => plugins.d/mandos-client.c
- plugins.d/password-request.xml => plugins.d/mandos-client.xml
- 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 © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 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 */
51
#include <inttypes.h> /* PRIu16 */
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() */
55
#include <assert.h> /* assert() */
56
#include <errno.h> /* perror(), errno */
57
#include <time.h> /* time() */
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
*/
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
64
#include <errno.h> /* perror(), errno,
65
program_invocation_short_name */
66
#include <time.h> /* nanosleep(), time(), sleep() */
58
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
59
68
SIOCSIFFLAGS, if_indextoname(),
60
69
if_nametoindex(), IF_NAMESIZE */
70
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
72
*/
61
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
62
getuid(), getgid(), setuid(),
63
setgid() */
64
#include <netinet/in.h>
65
#include <arpa/inet.h> /* inet_pton(), htons */
66
#include <iso646.h> /* not, and */
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 */
67
78
#include <argp.h> /* struct argp_option, error_t, struct
68
79
argp_state, struct argp,
69
80
argp_parse(), ARGP_KEY_ARG,
70
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__ */
71
98
72
99
/* Avahi */
73
100
/* All Avahi types, constants and functions
86
113
gnutls_*
87
114
init_gnutls_session(),
88
115
GNUTLS_* */
89
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
90
GNUTLS_OPENPGP_FMT_BASE64 */
116
#include <gnutls/openpgp.h>
117
/* gnutls_certificate_set_openpgp_key_file(),
118
GNUTLS_OPENPGP_FMT_BASE64 */
91
119
92
120
/* GPGME */
93
121
#include <gpgme.h> /* All GPGME types, constants and
98
126
99
127
#define BUFFER_SIZE 256
100
128
129
#define PATHDIR "/conf/conf.d/mandos"
130
#define SECKEY "seckey.txt"
131
#define PUBKEY "pubkey.txt"
132
#define HOOKDIR "/lib/mandos/network-hooks.d"
133
101
134
bool debug = false;
102
static const char *keydir = "/conf/conf.d/mandos";
103
135
static const char mandos_protocol_version[] = "1";
104
const char *argp_program_version = "password-request 1.0";
105
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;
106
154
107
155
/* Used for passing in values through the Avahi callback functions */
108
156
typedef struct {
109
AvahiSimplePoll *simple_poll;
110
157
AvahiServer *server;
111
158
gnutls_certificate_credentials_t cred;
112
159
unsigned int dh_bits;
113
160
gnutls_dh_params_t dh_params;
114
161
const char *priority;
162
gpgme_ctx_t ctx;
163
server *current_server;
164
char *interfaces;
165
size_t interfaces_size;
115
166
} mandos_context;
116
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 TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
191
}
192
117
193
/*
118
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
119
* "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,
120
196
* "buffer_length" is how much is already used.
121
197
*/
122
size_t adjustbuffer(char **buffer, size_t buffer_length,
123
size_t buffer_capacity){
124
if (buffer_length + BUFFER_SIZE > buffer_capacity){
198
size_t incbuffer(char **buffer, size_t buffer_length,
199
size_t buffer_capacity){
200
if(buffer_length + BUFFER_SIZE > buffer_capacity){
125
201
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
126
if (buffer == NULL){
202
if(buffer == NULL){
127
203
return 0;
128
204
}
129
205
buffer_capacity += BUFFER_SIZE;
131
207
return buffer_capacity;
132
208
}
133
209
210
/* Add server to set of servers to retry periodically */
211
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
212
int af, server **current_server){
213
int ret;
214
server *new_server = malloc(sizeof(server));
215
if(new_server == NULL){
216
perror_plus("malloc");
217
return false;
218
}
219
*new_server = (server){ .ip = strdup(ip),
220
.port = port,
221
.if_index = if_index,
222
.af = af };
223
if(new_server->ip == NULL){
224
perror_plus("strdup");
225
return false;
226
}
227
/* Special case of first server */
228
if(*current_server == NULL){
229
new_server->next = new_server;
230
new_server->prev = new_server;
231
*current_server = new_server;
232
/* Place the new server last in the list */
233
} else {
234
new_server->next = *current_server;
235
new_server->prev = (*current_server)->prev;
236
new_server->prev->next = new_server;
237
(*current_server)->prev = new_server;
238
}
239
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
240
if(ret == -1){
241
perror_plus("clock_gettime");
242
return false;
243
}
244
return true;
245
}
246
134
247
/*
135
* Decrypt OpenPGP data using keyrings in HOMEDIR.
136
* Returns -1 on error
248
* Initialize GPGME.
137
249
*/
138
static ssize_t pgp_packet_decrypt (const char *cryptotext,
139
size_t crypto_size,
140
char **plaintext,
141
const char *homedir){
142
gpgme_data_t dh_crypto, dh_plain;
143
gpgme_ctx_t ctx;
250
static bool init_gpgme(const char *seckey, const char *pubkey,
251
const char *tempdir, mandos_context *mc){
144
252
gpgme_error_t rc;
145
ssize_t ret;
146
size_t plaintext_capacity = 0;
147
ssize_t plaintext_length = 0;
148
253
gpgme_engine_info_t engine_info;
149
254
150
if (debug){
151
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
255
/*
256
* Helper function to insert pub and seckey to the engine keyring.
257
*/
258
bool import_key(const char *filename){
259
int ret;
260
int fd;
261
gpgme_data_t pgp_data;
262
263
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
264
if(fd == -1){
265
perror_plus("open");
266
return false;
267
}
268
269
rc = gpgme_data_new_from_fd(&pgp_data, fd);
270
if(rc != GPG_ERR_NO_ERROR){
271
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
272
gpgme_strsource(rc), gpgme_strerror(rc));
273
return false;
274
}
275
276
rc = gpgme_op_import(mc->ctx, pgp_data);
277
if(rc != GPG_ERR_NO_ERROR){
278
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
279
gpgme_strsource(rc), gpgme_strerror(rc));
280
return false;
281
}
282
283
ret = (int)TEMP_FAILURE_RETRY(close(fd));
284
if(ret == -1){
285
perror_plus("close");
286
}
287
gpgme_data_release(pgp_data);
288
return true;
289
}
290
291
if(debug){
292
fprintf_plus(stderr, "Initializing GPGME\n");
152
293
}
153
294
154
295
/* Init GPGME */
155
296
gpgme_check_version(NULL);
156
297
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
157
if (rc != GPG_ERR_NO_ERROR){
158
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
159
gpgme_strsource(rc), gpgme_strerror(rc));
160
return -1;
298
if(rc != GPG_ERR_NO_ERROR){
299
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
300
gpgme_strsource(rc), gpgme_strerror(rc));
301
return false;
161
302
}
162
303
163
304
/* Set GPGME home directory for the OpenPGP engine only */
164
rc = gpgme_get_engine_info (&engine_info);
165
if (rc != GPG_ERR_NO_ERROR){
166
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
167
gpgme_strsource(rc), gpgme_strerror(rc));
168
return -1;
305
rc = gpgme_get_engine_info(&engine_info);
306
if(rc != GPG_ERR_NO_ERROR){
307
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
308
gpgme_strsource(rc), gpgme_strerror(rc));
309
return false;
169
310
}
170
311
while(engine_info != NULL){
171
312
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
172
313
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
173
engine_info->file_name, homedir);
314
engine_info->file_name, tempdir);
174
315
break;
175
316
}
176
317
engine_info = engine_info->next;
177
318
}
178
319
if(engine_info == NULL){
179
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
180
return -1;
320
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
321
tempdir);
322
return false;
323
}
324
325
/* Create new GPGME "context" */
326
rc = gpgme_new(&(mc->ctx));
327
if(rc != GPG_ERR_NO_ERROR){
328
fprintf_plus(stderr, "Mandos plugin mandos-client: "
329
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
330
gpgme_strerror(rc));
331
return false;
332
}
333
334
if(not import_key(pubkey) or not import_key(seckey)){
335
return false;
336
}
337
338
return true;
339
}
340
341
/*
342
* Decrypt OpenPGP data.
343
* Returns -1 on error
344
*/
345
static ssize_t pgp_packet_decrypt(const char *cryptotext,
346
size_t crypto_size,
347
char **plaintext,
348
mandos_context *mc){
349
gpgme_data_t dh_crypto, dh_plain;
350
gpgme_error_t rc;
351
ssize_t ret;
352
size_t plaintext_capacity = 0;
353
ssize_t plaintext_length = 0;
354
355
if(debug){
356
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
181
357
}
182
358
183
359
/* Create new GPGME data buffer from memory cryptotext */
184
360
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
185
361
0);
186
if (rc != GPG_ERR_NO_ERROR){
187
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
188
gpgme_strsource(rc), gpgme_strerror(rc));
362
if(rc != GPG_ERR_NO_ERROR){
363
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
364
gpgme_strsource(rc), gpgme_strerror(rc));
189
365
return -1;
190
366
}
191
367
192
368
/* Create new empty GPGME data buffer for the plaintext */
193
369
rc = gpgme_data_new(&dh_plain);
194
if (rc != GPG_ERR_NO_ERROR){
195
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
196
gpgme_strsource(rc), gpgme_strerror(rc));
370
if(rc != GPG_ERR_NO_ERROR){
371
fprintf_plus(stderr, "Mandos plugin mandos-client: "
372
"bad gpgme_data_new: %s: %s\n",
373
gpgme_strsource(rc), gpgme_strerror(rc));
197
374
gpgme_data_release(dh_crypto);
198
375
return -1;
199
376
}
200
377
201
/* Create new GPGME "context" */
202
rc = gpgme_new(&ctx);
203
if (rc != GPG_ERR_NO_ERROR){
204
fprintf(stderr, "bad gpgme_new: %s: %s\n",
205
gpgme_strsource(rc), gpgme_strerror(rc));
206
plaintext_length = -1;
207
goto decrypt_end;
208
}
209
210
378
/* Decrypt data from the cryptotext data buffer to the plaintext
211
379
data buffer */
212
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
213
if (rc != GPG_ERR_NO_ERROR){
214
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
215
gpgme_strsource(rc), gpgme_strerror(rc));
380
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
381
if(rc != GPG_ERR_NO_ERROR){
382
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
383
gpgme_strsource(rc), gpgme_strerror(rc));
216
384
plaintext_length = -1;
217
if (debug){
385
if(debug){
218
386
gpgme_decrypt_result_t result;
219
result = gpgme_op_decrypt_result(ctx);
220
if (result == NULL){
221
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
387
result = gpgme_op_decrypt_result(mc->ctx);
388
if(result == NULL){
389
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
222
390
} else {
223
fprintf(stderr, "Unsupported algorithm: %s\n",
224
result->unsupported_algorithm);
225
fprintf(stderr, "Wrong key usage: %u\n",
226
result->wrong_key_usage);
391
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
392
result->unsupported_algorithm);
393
fprintf_plus(stderr, "Wrong key usage: %u\n",
394
result->wrong_key_usage);
227
395
if(result->file_name != NULL){
228
fprintf(stderr, "File name: %s\n", result->file_name);
396
fprintf_plus(stderr, "File name: %s\n", result->file_name);
229
397
}
230
398
gpgme_recipient_t recipient;
231
399
recipient = result->recipients;
232
if(recipient){
233
while(recipient != NULL){
234
fprintf(stderr, "Public key algorithm: %s\n",
235
gpgme_pubkey_algo_name(recipient->pubkey_algo));
236
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
237
fprintf(stderr, "Secret key available: %s\n",
238
recipient->status == GPG_ERR_NO_SECKEY
239
? "No" : "Yes");
240
recipient = recipient->next;
241
}
400
while(recipient != NULL){
401
fprintf_plus(stderr, "Public key algorithm: %s\n",
402
gpgme_pubkey_algo_name
403
(recipient->pubkey_algo));
404
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
405
fprintf_plus(stderr, "Secret key available: %s\n",
406
recipient->status == GPG_ERR_NO_SECKEY
407
? "No" : "Yes");
408
recipient = recipient->next;
242
409
}
243
410
}
244
411
}
246
413
}
247
414
248
415
if(debug){
249
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
416
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
250
417
}
251
418
252
419
/* Seek back to the beginning of the GPGME plaintext data buffer */
253
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
254
perror("pgpme_data_seek");
420
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
421
perror_plus("gpgme_data_seek");
255
422
plaintext_length = -1;
256
423
goto decrypt_end;
257
424
}
258
425
259
426
*plaintext = NULL;
260
427
while(true){
261
plaintext_capacity = adjustbuffer(plaintext,
262
(size_t)plaintext_length,
263
plaintext_capacity);
264
if (plaintext_capacity == 0){
265
perror("adjustbuffer");
266
plaintext_length = -1;
267
goto decrypt_end;
428
plaintext_capacity = incbuffer(plaintext,
429
(size_t)plaintext_length,
430
plaintext_capacity);
431
if(plaintext_capacity == 0){
432
perror_plus("incbuffer");
433
plaintext_length = -1;
434
goto decrypt_end;
268
435
}
269
436
270
437
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
271
438
BUFFER_SIZE);
272
439
/* Print the data, if any */
273
if (ret == 0){
440
if(ret == 0){
274
441
/* EOF */
275
442
break;
276
443
}
277
444
if(ret < 0){
278
perror("gpgme_data_read");
445
perror_plus("gpgme_data_read");
279
446
plaintext_length = -1;
280
447
goto decrypt_end;
281
448
}
282
449
plaintext_length += ret;
283
450
}
284
451
285
452
if(debug){
286
fprintf(stderr, "Decrypted password is: ");
453
fprintf_plus(stderr, "Decrypted password is: ");
287
454
for(ssize_t i = 0; i < plaintext_length; i++){
288
455
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
289
456
}
300
467
return plaintext_length;
301
468
}
302
469
303
static const char * safer_gnutls_strerror (int value) {
304
const char *ret = gnutls_strerror (value); /* Spurious warning */
305
if (ret == NULL)
470
static const char * safer_gnutls_strerror(int value){
471
const char *ret = gnutls_strerror(value);
472
if(ret == NULL)
306
473
ret = "(unknown)";
307
474
return ret;
308
475
}
310
477
/* GnuTLS log function callback */
311
478
static void debuggnutls(__attribute__((unused)) int level,
312
479
const char* string){
313
fprintf(stderr, "GnuTLS: %s", string);
480
fprintf_plus(stderr, "GnuTLS: %s", string);
314
481
}
315
482
316
static int init_gnutls_global(mandos_context *mc,
317
const char *pubkeyfilename,
318
const char *seckeyfilename){
483
static int init_gnutls_global(const char *pubkeyfilename,
484
const char *seckeyfilename,
485
mandos_context *mc){
319
486
int ret;
320
487
321
488
if(debug){
322
fprintf(stderr, "Initializing GnuTLS\n");
489
fprintf_plus(stderr, "Initializing GnuTLS\n");
323
490
}
324
491
325
492
ret = gnutls_global_init();
326
if (ret != GNUTLS_E_SUCCESS) {
327
fprintf (stderr, "GnuTLS global_init: %s\n",
328
safer_gnutls_strerror(ret));
493
if(ret != GNUTLS_E_SUCCESS){
494
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
495
safer_gnutls_strerror(ret));
329
496
return -1;
330
497
}
331
498
332
if (debug){
499
if(debug){
333
500
/* "Use a log level over 10 to enable all debugging options."
334
501
* - GnuTLS manual
335
502
*/
338
505
}
339
506
340
507
/* OpenPGP credentials */
341
gnutls_certificate_allocate_credentials(&mc->cred);
342
if (ret != GNUTLS_E_SUCCESS){
343
fprintf (stderr, "GnuTLS memory error: %s\n", /* Spurious
344
warning */
345
safer_gnutls_strerror(ret));
346
gnutls_global_deinit ();
508
ret = gnutls_certificate_allocate_credentials(&mc->cred);
509
if(ret != GNUTLS_E_SUCCESS){
510
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
511
safer_gnutls_strerror(ret));
512
gnutls_global_deinit();
347
513
return -1;
348
514
}
349
515
350
516
if(debug){
351
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
352
" and keyfile %s as GnuTLS credentials\n", pubkeyfilename,
353
seckeyfilename);
517
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
518
" secret key %s as GnuTLS credentials\n",
519
pubkeyfilename,
520
seckeyfilename);
354
521
}
355
522
356
523
ret = gnutls_certificate_set_openpgp_key_file
357
524
(mc->cred, pubkeyfilename, seckeyfilename,
358
525
GNUTLS_OPENPGP_FMT_BASE64);
359
if (ret != GNUTLS_E_SUCCESS) {
360
fprintf(stderr,
361
"Error[%d] while reading the OpenPGP key pair ('%s',"
362
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
363
fprintf(stdout, "The GnuTLS error is: %s\n",
364
safer_gnutls_strerror(ret));
526
if(ret != GNUTLS_E_SUCCESS){
527
fprintf_plus(stderr,
528
"Error[%d] while reading the OpenPGP key pair ('%s',"
529
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
530
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
531
safer_gnutls_strerror(ret));
365
532
goto globalfail;
366
533
}
367
534
368
535
/* GnuTLS server initialization */
369
536
ret = gnutls_dh_params_init(&mc->dh_params);
370
if (ret != GNUTLS_E_SUCCESS) {
371
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
372
" %s\n", safer_gnutls_strerror(ret));
537
if(ret != GNUTLS_E_SUCCESS){
538
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
539
" initialization: %s\n",
540
safer_gnutls_strerror(ret));
373
541
goto globalfail;
374
542
}
375
543
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
376
if (ret != GNUTLS_E_SUCCESS) {
377
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
378
safer_gnutls_strerror(ret));
544
if(ret != GNUTLS_E_SUCCESS){
545
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
546
safer_gnutls_strerror(ret));
379
547
goto globalfail;
380
548
}
381
549
382
550
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
383
551
384
552
return 0;
385
553
386
554
globalfail:
387
555
388
556
gnutls_certificate_free_credentials(mc->cred);
389
557
gnutls_global_deinit();
558
gnutls_dh_params_deinit(mc->dh_params);
390
559
return -1;
391
392
560
}
393
561
394
static int init_gnutls_session(mandos_context *mc,
395
gnutls_session_t *session){
562
static int init_gnutls_session(gnutls_session_t *session,
563
mandos_context *mc){
396
564
int ret;
397
565
/* GnuTLS session creation */
398
ret = gnutls_init(session, GNUTLS_SERVER);
399
if (ret != GNUTLS_E_SUCCESS){
400
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
401
safer_gnutls_strerror(ret));
566
do {
567
ret = gnutls_init(session, GNUTLS_SERVER);
568
if(quit_now){
569
return -1;
570
}
571
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
572
if(ret != GNUTLS_E_SUCCESS){
573
fprintf_plus(stderr,
574
"Error in GnuTLS session initialization: %s\n",
575
safer_gnutls_strerror(ret));
402
576
}
403
577
404
578
{
405
579
const char *err;
406
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
407
if (ret != GNUTLS_E_SUCCESS) {
408
fprintf(stderr, "Syntax error at: %s\n", err);
409
fprintf(stderr, "GnuTLS error: %s\n",
410
safer_gnutls_strerror(ret));
411
gnutls_deinit (*session);
580
do {
581
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
582
if(quit_now){
583
gnutls_deinit(*session);
584
return -1;
585
}
586
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
587
if(ret != GNUTLS_E_SUCCESS){
588
fprintf_plus(stderr, "Syntax error at: %s\n", err);
589
fprintf_plus(stderr, "GnuTLS error: %s\n",
590
safer_gnutls_strerror(ret));
591
gnutls_deinit(*session);
412
592
return -1;
413
593
}
414
594
}
415
595
416
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
417
mc->cred);
418
if (ret != GNUTLS_E_SUCCESS) {
419
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
420
safer_gnutls_strerror(ret));
421
gnutls_deinit (*session);
596
do {
597
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
598
mc->cred);
599
if(quit_now){
600
gnutls_deinit(*session);
601
return -1;
602
}
603
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
604
if(ret != GNUTLS_E_SUCCESS){
605
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
606
safer_gnutls_strerror(ret));
607
gnutls_deinit(*session);
422
608
return -1;
423
609
}
424
610
425
611
/* ignore client certificate if any. */
426
gnutls_certificate_server_set_request (*session,
427
GNUTLS_CERT_IGNORE);
612
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
428
613
429
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
614
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
430
615
431
616
return 0;
432
617
}
436
621
__attribute__((unused)) const char *txt){}
437
622
438
623
/* Called when a Mandos server is found */
439
static int start_mandos_communication(const char *ip, uint16_t port,
624
static int start_mandos_communication(const char *ip, in_port_t port,
440
625
AvahiIfIndex if_index,
441
mandos_context *mc){
442
int ret, tcp_sd;
443
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
626
int af, mandos_context *mc){
627
int ret, tcp_sd = -1;
628
ssize_t sret;
629
union {
630
struct sockaddr_in in;
631
struct sockaddr_in6 in6;
632
} to;
444
633
char *buffer = NULL;
445
char *decrypted_buffer;
634
char *decrypted_buffer = NULL;
446
635
size_t buffer_length = 0;
447
636
size_t buffer_capacity = 0;
448
ssize_t decrypted_buffer_size;
449
637
size_t written;
450
int retval = 0;
451
char interface[IF_NAMESIZE];
638
int retval = -1;
452
639
gnutls_session_t session;
453
454
ret = init_gnutls_session (mc, &session);
455
if (ret != 0){
456
return -1;
457
}
458
459
if(debug){
460
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
461
"\n", ip, port);
462
}
463
464
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
465
if(tcp_sd < 0) {
466
perror("socket");
467
return -1;
468
}
469
470
if(debug){
471
if(if_indextoname((unsigned int)if_index, interface) == NULL){
472
perror("if_indextoname");
640
int pf; /* Protocol family */
641
642
errno = 0;
643
644
if(quit_now){
645
errno = EINTR;
646
return -1;
647
}
648
649
switch(af){
650
case AF_INET6:
651
pf = PF_INET6;
652
break;
653
case AF_INET:
654
pf = PF_INET;
655
break;
656
default:
657
fprintf_plus(stderr, "Bad address family: %d\n", af);
658
errno = EINVAL;
659
return -1;
660
}
661
662
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
663
/* Check if the interface is one of the interfaces we are using */
664
bool match = false;
665
{
666
char *interface = NULL;
667
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
668
interface))){
669
if(if_nametoindex(interface) == (unsigned int)if_index){
670
match = true;
671
break;
672
}
673
}
674
}
675
if(not match){
676
if(debug){
677
char interface[IF_NAMESIZE];
678
if(if_indextoname((unsigned int)if_index, interface) == NULL){
679
perror_plus("if_indextoname");
680
} else {
681
fprintf_plus(stderr, "Skipping server on non-used interface"
682
" \"%s\"\n",
683
if_indextoname((unsigned int)if_index,
684
interface));
685
}
686
}
473
687
return -1;
474
688
}
475
fprintf(stderr, "Binding to interface %s\n", interface);
689
}
690
691
ret = init_gnutls_session(&session, mc);
692
if(ret != 0){
693
return -1;
694
}
695
696
if(debug){
697
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
698
PRIuMAX "\n", ip, (uintmax_t)port);
699
}
700
701
tcp_sd = socket(pf, SOCK_STREAM, 0);
702
if(tcp_sd < 0){
703
int e = errno;
704
perror_plus("socket");
705
errno = e;
706
goto mandos_end;
707
}
708
709
if(quit_now){
710
errno = EINTR;
711
goto mandos_end;
476
712
}
477
713
478
714
memset(&to, 0, sizeof(to));
479
to.in6.sin6_family = AF_INET6;
480
/* It would be nice to have a way to detect if we were passed an
481
IPv4 address here. Now we assume an IPv6 address. */
482
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
483
if (ret < 0 ){
484
perror("inet_pton");
485
return -1;
715
if(af == AF_INET6){
716
to.in6.sin6_family = (sa_family_t)af;
717
ret = inet_pton(af, ip, &to.in6.sin6_addr);
718
} else { /* IPv4 */
719
to.in.sin_family = (sa_family_t)af;
720
ret = inet_pton(af, ip, &to.in.sin_addr);
721
}
722
if(ret < 0 ){
723
int e = errno;
724
perror_plus("inet_pton");
725
errno = e;
726
goto mandos_end;
486
727
}
487
728
if(ret == 0){
488
fprintf(stderr, "Bad address: %s\n", ip);
489
return -1;
490
}
491
to.in6.sin6_port = htons(port); /* Spurious warning */
729
int e = errno;
730
fprintf_plus(stderr, "Bad address: %s\n", ip);
731
errno = e;
732
goto mandos_end;
733
}
734
if(af == AF_INET6){
735
to.in6.sin6_port = htons(port);
736
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
737
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
738
-Wunreachable-code*/
739
if(if_index == AVAHI_IF_UNSPEC){
740
fprintf_plus(stderr, "An IPv6 link-local address is"
741
" incomplete without a network interface\n");
742
errno = EINVAL;
743
goto mandos_end;
744
}
745
/* Set the network interface number as scope */
746
to.in6.sin6_scope_id = (uint32_t)if_index;
747
}
748
} else {
749
to.in.sin_port = htons(port); /* Spurious warnings from
750
-Wconversion and
751
-Wunreachable-code */
752
}
492
753
493
to.in6.sin6_scope_id = (uint32_t)if_index;
754
if(quit_now){
755
errno = EINTR;
756
goto mandos_end;
757
}
494
758
495
759
if(debug){
496
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
497
port);
498
char addrstr[INET6_ADDRSTRLEN] = "";
499
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
500
sizeof(addrstr)) == NULL){
501
perror("inet_ntop");
760
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
761
char interface[IF_NAMESIZE];
762
if(if_indextoname((unsigned int)if_index, interface) == NULL){
763
perror_plus("if_indextoname");
764
} else {
765
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
766
"\n", ip, interface, (uintmax_t)port);
767
}
768
} else {
769
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
770
ip, (uintmax_t)port);
771
}
772
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
773
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
774
const char *pcret;
775
if(af == AF_INET6){
776
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
777
sizeof(addrstr));
778
} else {
779
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
780
sizeof(addrstr));
781
}
782
if(pcret == NULL){
783
perror_plus("inet_ntop");
502
784
} else {
503
785
if(strcmp(addrstr, ip) != 0){
504
fprintf(stderr, "Canonical address form: %s\n", addrstr);
786
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
505
787
}
506
788
}
507
789
}
508
790
509
ret = connect(tcp_sd, &to.in, sizeof(to));
510
if (ret < 0){
511
perror("connect");
512
return -1;
513
}
514
791
if(quit_now){
792
errno = EINTR;
793
goto mandos_end;
794
}
795
796
if(af == AF_INET6){
797
ret = connect(tcp_sd, &to.in6, sizeof(to));
798
} else {
799
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
800
}
801
if(ret < 0){
802
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
803
int e = errno;
804
perror_plus("connect");
805
errno = e;
806
}
807
goto mandos_end;
808
}
809
810
if(quit_now){
811
errno = EINTR;
812
goto mandos_end;
813
}
814
515
815
const char *out = mandos_protocol_version;
516
816
written = 0;
517
while (true){
817
while(true){
518
818
size_t out_size = strlen(out);
519
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
520
out_size - written));
521
if (ret == -1){
522
perror("write");
523
retval = -1;
819
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
820
out_size - written));
821
if(ret == -1){
822
int e = errno;
823
perror_plus("write");
824
errno = e;
524
825
goto mandos_end;
525
826
}
526
827
written += (size_t)ret;
527
828
if(written < out_size){
528
829
continue;
529
830
} else {
530
if (out == mandos_protocol_version){
831
if(out == mandos_protocol_version){
531
832
written = 0;
532
833
out = "\r\n";
533
834
} else {
534
835
break;
535
836
}
536
837
}
838
839
if(quit_now){
840
errno = EINTR;
841
goto mandos_end;
842
}
537
843
}
538
844
539
845
if(debug){
540
fprintf(stderr, "Establishing TLS session with %s\n", ip);
541
}
542
543
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
544
545
do{
546
ret = gnutls_handshake (session);
846
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
847
}
848
849
if(quit_now){
850
errno = EINTR;
851
goto mandos_end;
852
}
853
854
/* This casting via intptr_t is to eliminate warning about casting
855
an int to a pointer type. This is exactly how the GnuTLS Guile
856
function "set-session-transport-fd!" does it. */
857
gnutls_transport_set_ptr(session,
858
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
859
860
if(quit_now){
861
errno = EINTR;
862
goto mandos_end;
863
}
864
865
do {
866
ret = gnutls_handshake(session);
867
if(quit_now){
868
errno = EINTR;
869
goto mandos_end;
870
}
547
871
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
548
872
549
if (ret != GNUTLS_E_SUCCESS){
873
if(ret != GNUTLS_E_SUCCESS){
550
874
if(debug){
551
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
552
gnutls_perror (ret);
875
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
876
gnutls_perror(ret);
553
877
}
554
retval = -1;
878
errno = EPROTO;
555
879
goto mandos_end;
556
880
}
557
881
558
882
/* Read OpenPGP packet that contains the wanted password */
559
883
560
884
if(debug){
561
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
562
ip);
885
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
886
" %s\n", ip);
563
887
}
564
888
565
889
while(true){
566
buffer_capacity = adjustbuffer(&buffer, buffer_length,
567
buffer_capacity);
568
if (buffer_capacity == 0){
569
perror("adjustbuffer");
570
retval = -1;
571
goto mandos_end;
572
}
573
574
ret = gnutls_record_recv(session, buffer+buffer_length,
575
BUFFER_SIZE);
576
if (ret == 0){
890
891
if(quit_now){
892
errno = EINTR;
893
goto mandos_end;
894
}
895
896
buffer_capacity = incbuffer(&buffer, buffer_length,
897
buffer_capacity);
898
if(buffer_capacity == 0){
899
int e = errno;
900
perror_plus("incbuffer");
901
errno = e;
902
goto mandos_end;
903
}
904
905
if(quit_now){
906
errno = EINTR;
907
goto mandos_end;
908
}
909
910
sret = gnutls_record_recv(session, buffer+buffer_length,
911
BUFFER_SIZE);
912
if(sret == 0){
577
913
break;
578
914
}
579
if (ret < 0){
580
switch(ret){
915
if(sret < 0){
916
switch(sret){
581
917
case GNUTLS_E_INTERRUPTED:
582
918
case GNUTLS_E_AGAIN:
583
919
break;
584
920
case GNUTLS_E_REHANDSHAKE:
585
do{
586
ret = gnutls_handshake (session);
921
do {
922
ret = gnutls_handshake(session);
923
924
if(quit_now){
925
errno = EINTR;
926
goto mandos_end;
927
}
587
928
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
588
if (ret < 0){
589
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
590
gnutls_perror (ret);
591
retval = -1;
929
if(ret < 0){
930
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
931
"***\n");
932
gnutls_perror(ret);
933
errno = EPROTO;
592
934
goto mandos_end;
593
935
}
594
936
break;
595
937
default:
596
fprintf(stderr, "Unknown error while reading data from"
597
" encrypted session with Mandos server\n");
598
retval = -1;
599
gnutls_bye (session, GNUTLS_SHUT_RDWR);
938
fprintf_plus(stderr, "Unknown error while reading data from"
939
" encrypted session with Mandos server\n");
940
gnutls_bye(session, GNUTLS_SHUT_RDWR);
941
errno = EIO;
600
942
goto mandos_end;
601
943
}
602
944
} else {
603
buffer_length += (size_t) ret;
945
buffer_length += (size_t) sret;
604
946
}
605
947
}
606
948
607
949
if(debug){
608
fprintf(stderr, "Closing TLS session\n");
609
}
610
611
gnutls_bye (session, GNUTLS_SHUT_RDWR);
612
613
if (buffer_length > 0){
614
decrypted_buffer_size = pgp_packet_decrypt(buffer,
615
buffer_length,
616
&decrypted_buffer,
617
keydir);
618
if (decrypted_buffer_size >= 0){
950
fprintf_plus(stderr, "Closing TLS session\n");
951
}
952
953
if(quit_now){
954
errno = EINTR;
955
goto mandos_end;
956
}
957
958
do {
959
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
960
if(quit_now){
961
errno = EINTR;
962
goto mandos_end;
963
}
964
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
965
966
if(buffer_length > 0){
967
ssize_t decrypted_buffer_size;
968
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
969
&decrypted_buffer, mc);
970
if(decrypted_buffer_size >= 0){
971
619
972
written = 0;
620
973
while(written < (size_t) decrypted_buffer_size){
621
ret = (int)fwrite (decrypted_buffer + written, 1,
622
(size_t)decrypted_buffer_size - written,
623
stdout);
974
if(quit_now){
975
errno = EINTR;
976
goto mandos_end;
977
}
978
979
ret = (int)fwrite(decrypted_buffer + written, 1,
980
(size_t)decrypted_buffer_size - written,
981
stdout);
624
982
if(ret == 0 and ferror(stdout)){
983
int e = errno;
625
984
if(debug){
626
fprintf(stderr, "Error writing encrypted data: %s\n",
627
strerror(errno));
985
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
986
strerror(errno));
628
987
}
629
retval = -1;
630
break;
988
errno = e;
989
goto mandos_end;
631
990
}
632
991
written += (size_t)ret;
633
992
}
634
free(decrypted_buffer);
635
} else {
636
retval = -1;
993
retval = 0;
637
994
}
638
} else {
639
retval = -1;
640
995
}
641
996
642
997
/* Shutdown procedure */
643
998
644
999
mandos_end:
645
free(buffer);
646
close(tcp_sd);
647
gnutls_deinit (session);
1000
{
1001
int e = errno;
1002
free(decrypted_buffer);
1003
free(buffer);
1004
if(tcp_sd >= 0){
1005
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1006
}
1007
if(ret == -1){
1008
if(e == 0){
1009
e = errno;
1010
}
1011
perror_plus("close");
1012
}
1013
gnutls_deinit(session);
1014
errno = e;
1015
if(quit_now){
1016
errno = EINTR;
1017
retval = -1;
1018
}
1019
}
648
1020
return retval;
649
1021
}
650
1022
651
1023
static void resolve_callback(AvahiSServiceResolver *r,
652
1024
AvahiIfIndex interface,
653
AVAHI_GCC_UNUSED AvahiProtocol protocol,
1025
AvahiProtocol proto,
654
1026
AvahiResolverEvent event,
655
1027
const char *name,
656
1028
const char *type,
661
1033
AVAHI_GCC_UNUSED AvahiStringList *txt,
662
1034
AVAHI_GCC_UNUSED AvahiLookupResultFlags
663
1035
flags,
664
void* userdata) {
665
mandos_context *mc = userdata;
666
assert(r);
1036
void* mc){
1037
if(r == NULL){
1038
return;
1039
}
667
1040
668
1041
/* Called whenever a service has been resolved successfully or
669
1042
timed out */
670
1043
671
switch (event) {
1044
if(quit_now){
1045
return;
1046
}
1047
1048
switch(event){
672
1049
default:
673
1050
case AVAHI_RESOLVER_FAILURE:
674
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
675
" of type '%s' in domain '%s': %s\n", name, type, domain,
676
avahi_strerror(avahi_server_errno(mc->server)));
1051
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1052
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1053
domain,
1054
avahi_strerror(avahi_server_errno
1055
(((mandos_context*)mc)->server)));
677
1056
break;
678
1057
679
1058
case AVAHI_RESOLVER_FOUND:
681
1060
char ip[AVAHI_ADDRESS_STR_MAX];
682
1061
avahi_address_snprint(ip, sizeof(ip), address);
683
1062
if(debug){
684
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
685
PRIu16 ") on port %d\n", name, host_name, ip,
686
interface, port);
1063
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1064
PRIdMAX ") on port %" PRIu16 "\n", name,
1065
host_name, ip, (intmax_t)interface, port);
687
1066
}
688
int ret = start_mandos_communication(ip, port, interface, mc);
689
if (ret == 0){
690
avahi_simple_poll_quit(mc->simple_poll);
1067
int ret = start_mandos_communication(ip, (in_port_t)port,
1068
interface,
1069
avahi_proto_to_af(proto),
1070
mc);
1071
if(ret == 0){
1072
avahi_simple_poll_quit(simple_poll);
1073
} else {
1074
if(not add_server(ip, (in_port_t)port, interface,
1075
avahi_proto_to_af(proto),
1076
&((mandos_context*)mc)->current_server)){
1077
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1078
" list\n", name);
1079
}
691
1080
}
692
1081
}
693
1082
}
694
1083
avahi_s_service_resolver_free(r);
695
1084
}
696
1085
697
static void browse_callback( AvahiSServiceBrowser *b,
698
AvahiIfIndex interface,
699
AvahiProtocol protocol,
700
AvahiBrowserEvent event,
701
const char *name,
702
const char *type,
703
const char *domain,
704
AVAHI_GCC_UNUSED AvahiLookupResultFlags
705
flags,
706
void* userdata) {
707
mandos_context *mc = userdata;
708
assert(b);
1086
static void browse_callback(AvahiSServiceBrowser *b,
1087
AvahiIfIndex interface,
1088
AvahiProtocol protocol,
1089
AvahiBrowserEvent event,
1090
const char *name,
1091
const char *type,
1092
const char *domain,
1093
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1094
flags,
1095
void* mc){
1096
if(b == NULL){
1097
return;
1098
}
709
1099
710
1100
/* Called whenever a new services becomes available on the LAN or
711
1101
is removed from the LAN */
712
1102
713
switch (event) {
1103
if(quit_now){
1104
return;
1105
}
1106
1107
switch(event){
714
1108
default:
715
1109
case AVAHI_BROWSER_FAILURE:
716
1110
717
fprintf(stderr, "(Avahi browser) %s\n",
718
avahi_strerror(avahi_server_errno(mc->server)));
719
avahi_simple_poll_quit(mc->simple_poll);
1111
fprintf_plus(stderr, "(Avahi browser) %s\n",
1112
avahi_strerror(avahi_server_errno
1113
(((mandos_context*)mc)->server)));
1114
avahi_simple_poll_quit(simple_poll);
720
1115
return;
721
1116
722
1117
case AVAHI_BROWSER_NEW:
725
1120
the callback function is called the Avahi server will free the
726
1121
resolver for us. */
727
1122
728
if (!(avahi_s_service_resolver_new(mc->server, interface,
729
protocol, name, type, domain,
730
AVAHI_PROTO_INET6, 0,
731
resolve_callback, mc)))
732
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
733
name, avahi_strerror(avahi_server_errno(mc->server)));
1123
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1124
interface, protocol, name, type,
1125
domain, protocol, 0,
1126
resolve_callback, mc) == NULL)
1127
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1128
" %s\n", name,
1129
avahi_strerror(avahi_server_errno
1130
(((mandos_context*)mc)->server)));
734
1131
break;
735
1132
736
1133
case AVAHI_BROWSER_REMOVE:
739
1136
case AVAHI_BROWSER_ALL_FOR_NOW:
740
1137
case AVAHI_BROWSER_CACHE_EXHAUSTED:
741
1138
if(debug){
742
fprintf(stderr, "No Mandos server found, still searching...\n");
1139
fprintf_plus(stderr, "No Mandos server found, still"
1140
" searching...\n");
743
1141
}
744
1142
break;
745
1143
}
746
1144
}
747
1145
748
/* Combines file name and path and returns the malloced new
749
string. some sane checks could/should be added */
750
static char *combinepath(const char *first, const char *second){
751
char *tmp;
752
int ret = asprintf(&tmp, "%s/%s", first, second);
1146
/* Signal handler that stops main loop after SIGTERM */
1147
static void handle_sigterm(int sig){
1148
if(quit_now){
1149
return;
1150
}
1151
quit_now = 1;
1152
signal_received = sig;
1153
int old_errno = errno;
1154
/* set main loop to exit */
1155
if(simple_poll != NULL){
1156
avahi_simple_poll_quit(simple_poll);
1157
}
1158
errno = old_errno;
1159
}
1160
1161
bool get_flags(const char *ifname, struct ifreq *ifr){
1162
int ret;
1163
error_t ret_errno;
1164
1165
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1166
if(s < 0){
1167
ret_errno = errno;
1168
perror_plus("socket");
1169
errno = ret_errno;
1170
return false;
1171
}
1172
strcpy(ifr->ifr_name, ifname);
1173
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1174
if(ret == -1){
1175
if(debug){
1176
ret_errno = errno;
1177
perror_plus("ioctl SIOCGIFFLAGS");
1178
errno = ret_errno;
1179
}
1180
return false;
1181
}
1182
return true;
1183
}
1184
1185
bool good_flags(const char *ifname, const struct ifreq *ifr){
1186
1187
/* Reject the loopback device */
1188
if(ifr->ifr_flags & IFF_LOOPBACK){
1189
if(debug){
1190
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1191
ifname);
1192
}
1193
return false;
1194
}
1195
/* Accept point-to-point devices only if connect_to is specified */
1196
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1197
if(debug){
1198
fprintf_plus(stderr, "Accepting point-to-point interface"
1199
" \"%s\"\n", ifname);
1200
}
1201
return true;
1202
}
1203
/* Otherwise, reject non-broadcast-capable devices */
1204
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1205
if(debug){
1206
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1207
" \"%s\"\n", ifname);
1208
}
1209
return false;
1210
}
1211
/* Reject non-ARP interfaces (including dummy interfaces) */
1212
if(ifr->ifr_flags & IFF_NOARP){
1213
if(debug){
1214
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1215
ifname);
1216
}
1217
return false;
1218
}
1219
1220
/* Accept this device */
1221
if(debug){
1222
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1223
}
1224
return true;
1225
}
1226
1227
/*
1228
* This function determines if a directory entry in /sys/class/net
1229
* corresponds to an acceptable network device.
1230
* (This function is passed to scandir(3) as a filter function.)
1231
*/
1232
int good_interface(const struct dirent *if_entry){
1233
if(if_entry->d_name[0] == '.'){
1234
return 0;
1235
}
1236
1237
struct ifreq ifr;
1238
if(not get_flags(if_entry->d_name, &ifr)){
1239
if(debug){
1240
fprintf_plus(stderr, "Failed to get flags for interface "
1241
"\"%s\"\n", if_entry->d_name);
1242
}
1243
return 0;
1244
}
1245
1246
if(not good_flags(if_entry->d_name, &ifr)){
1247
return 0;
1248
}
1249
return 1;
1250
}
1251
1252
/*
1253
* This function determines if a network interface is up.
1254
*/
1255
bool interface_is_up(const char *interface){
1256
struct ifreq ifr;
1257
if(not get_flags(interface, &ifr)){
1258
if(debug){
1259
fprintf_plus(stderr, "Failed to get flags for interface "
1260
"\"%s\"\n", interface);
1261
}
1262
return false;
1263
}
1264
1265
return (bool)(ifr.ifr_flags & IFF_UP);
1266
}
1267
1268
/*
1269
* This function determines if a network interface is running
1270
*/
1271
bool interface_is_running(const char *interface){
1272
struct ifreq ifr;
1273
if(not get_flags(interface, &ifr)){
1274
if(debug){
1275
fprintf_plus(stderr, "Failed to get flags for interface "
1276
"\"%s\"\n", interface);
1277
}
1278
return false;
1279
}
1280
1281
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1282
}
1283
1284
int notdotentries(const struct dirent *direntry){
1285
/* Skip "." and ".." */
1286
if(direntry->d_name[0] == '.'
1287
and (direntry->d_name[1] == '\0'
1288
or (direntry->d_name[1] == '.'
1289
and direntry->d_name[2] == '\0'))){
1290
return 0;
1291
}
1292
return 1;
1293
}
1294
1295
/* Is this directory entry a runnable program? */
1296
int runnable_hook(const struct dirent *direntry){
1297
int ret;
1298
size_t sret;
1299
struct stat st;
1300
1301
if((direntry->d_name)[0] == '\0'){
1302
/* Empty name? */
1303
return 0;
1304
}
1305
1306
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1307
"abcdefghijklmnopqrstuvwxyz"
1308
"0123456789"
1309
"_-");
1310
if((direntry->d_name)[sret] != '\0'){
1311
/* Contains non-allowed characters */
1312
if(debug){
1313
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1314
direntry->d_name);
1315
}
1316
return 0;
1317
}
1318
1319
char *fullname = NULL;
1320
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
753
1321
if(ret < 0){
754
return NULL;
755
}
756
return tmp;
1322
perror_plus("asprintf");
1323
return 0;
1324
}
1325
1326
ret = stat(fullname, &st);
1327
if(ret == -1){
1328
if(debug){
1329
perror_plus("Could not stat hook");
1330
}
1331
return 0;
1332
}
1333
if(not (S_ISREG(st.st_mode))){
1334
/* Not a regular file */
1335
if(debug){
1336
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1337
direntry->d_name);
1338
}
1339
return 0;
1340
}
1341
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1342
/* Not executable */
1343
if(debug){
1344
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1345
direntry->d_name);
1346
}
1347
return 0;
1348
}
1349
if(debug){
1350
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1351
direntry->d_name);
1352
}
1353
return 1;
757
1354
}
758
1355
759
760
int main(int argc, char *argv[]){
761
AvahiSServiceBrowser *sb = NULL;
762
int error;
763
int ret;
764
int exitcode = EXIT_SUCCESS;
765
const char *interface = "eth0";
766
struct ifreq network;
767
int sd;
768
uid_t uid;
769
gid_t gid;
770
char *connect_to = NULL;
771
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
772
char *pubkeyfilename = NULL;
773
char *seckeyfilename = NULL;
774
const char *pubkeyname = "pubkey.txt";
775
const char *seckeyname = "seckey.txt";
776
mandos_context mc = { .simple_poll = NULL, .server = NULL,
777
.dh_bits = 1024, .priority = "SECURE256"};
778
bool gnutls_initalized = false;
779
780
{
781
struct argp_option options[] = {
782
{ .name = "debug", .key = 128,
783
.doc = "Debug mode", .group = 3 },
784
{ .name = "connect", .key = 'c',
785
.arg = "IP",
786
.doc = "Connect directly to a sepcified mandos server",
787
.group = 1 },
788
{ .name = "interface", .key = 'i',
789
.arg = "INTERFACE",
790
.doc = "Interface that Avahi will conntect through",
791
.group = 1 },
792
{ .name = "keydir", .key = 'd',
793
.arg = "KEYDIR",
794
.doc = "Directory where the openpgp keyring is",
795
.group = 1 },
796
{ .name = "seckey", .key = 's',
797
.arg = "SECKEY",
798
.doc = "Secret openpgp key for gnutls authentication",
799
.group = 1 },
800
{ .name = "pubkey", .key = 'p',
801
.arg = "PUBKEY",
802
.doc = "Public openpgp key for gnutls authentication",
803
.group = 2 },
804
{ .name = "dh-bits", .key = 129,
805
.arg = "BITS",
806
.doc = "dh-bits to use in gnutls communication",
807
.group = 2 },
808
{ .name = "priority", .key = 130,
809
.arg = "PRIORITY",
810
.doc = "GNUTLS priority", .group = 1 },
811
{ .name = NULL }
812
};
813
814
815
error_t parse_opt (int key, char *arg,
816
struct argp_state *state) {
817
/* Get the INPUT argument from `argp_parse', which we know is
818
a pointer to our plugin list pointer. */
819
switch (key) {
820
case 128:
821
debug = true;
822
break;
823
case 'c':
824
connect_to = arg;
825
break;
826
case 'i':
827
interface = arg;
828
break;
829
case 'd':
830
keydir = arg;
831
break;
832
case 's':
833
seckeyname = arg;
834
break;
835
case 'p':
836
pubkeyname = arg;
837
break;
838
case 129:
839
errno = 0;
840
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
841
if (errno){
842
perror("strtol");
843
exit(EXIT_FAILURE);
844
}
845
break;
846
case 130:
847
mc.priority = arg;
848
break;
849
case ARGP_KEY_ARG:
850
argp_usage (state);
851
case ARGP_KEY_END:
852
break;
853
default:
854
return ARGP_ERR_UNKNOWN;
855
}
856
return 0;
857
}
858
859
struct argp argp = { .options = options, .parser = parse_opt,
860
.args_doc = "",
861
.doc = "Mandos client -- Get and decrypt"
862
" passwords from mandos server" };
863
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
864
if (ret == ARGP_ERR_UNKNOWN){
865
fprintf(stderr, "Unknown error while parsing arguments\n");
866
exitcode = EXIT_FAILURE;
867
goto end;
868
}
869
}
870
871
pubkeyfilename = combinepath(keydir, pubkeyname);
872
if (pubkeyfilename == NULL){
873
perror("combinepath");
874
exitcode = EXIT_FAILURE;
875
goto end;
876
}
877
878
seckeyfilename = combinepath(keydir, seckeyname);
879
if (seckeyfilename == NULL){
880
perror("combinepath");
881
exitcode = EXIT_FAILURE;
882
goto end;
883
}
884
885
ret = init_gnutls_global(&mc, pubkeyfilename, seckeyfilename);
886
if (ret == -1){
887
fprintf(stderr, "init_gnutls_global failed\n");
888
exitcode = EXIT_FAILURE;
889
goto end;
1356
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1357
mandos_context *mc){
1358
int ret;
1359
struct timespec now;
1360
struct timespec waited_time;
1361
intmax_t block_time;
1362
1363
while(true){
1364
if(mc->current_server == NULL){
1365
if (debug){
1366
fprintf_plus(stderr, "Wait until first server is found."
1367
" No timeout!\n");
1368
}
1369
ret = avahi_simple_poll_iterate(s, -1);
890
1370
} else {
891
gnutls_initalized = true;
892
}
893
894
/* If the interface is down, bring it up */
895
{
896
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
897
if(sd < 0) {
898
perror("socket");
899
exitcode = EXIT_FAILURE;
900
goto end;
1371
if (debug){
1372
fprintf_plus(stderr, "Check current_server if we should run"
1373
" it, or wait\n");
901
1374
}
902
strcpy(network.ifr_name, interface);
903
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1375
/* the current time */
1376
ret = clock_gettime(CLOCK_MONOTONIC, &now);
904
1377
if(ret == -1){
905
perror("ioctl SIOCGIFFLAGS");
906
exitcode = EXIT_FAILURE;
907
goto end;
908
}
909
if((network.ifr_flags & IFF_UP) == 0){
910
network.ifr_flags |= IFF_UP;
911
ret = ioctl(sd, SIOCSIFFLAGS, &network);
912
if(ret == -1){
913
perror("ioctl SIOCSIFFLAGS");
914
exitcode = EXIT_FAILURE;
915
goto end;
916
}
917
}
1378
perror_plus("clock_gettime");
1379
return -1;
1380
}
1381
/* Calculating in ms how long time between now and server
1382
who we visted longest time ago. Now - last seen. */
1383
waited_time.tv_sec = (now.tv_sec
1384
- mc->current_server->last_seen.tv_sec);
1385
waited_time.tv_nsec = (now.tv_nsec
1386
- mc->current_server->last_seen.tv_nsec);
1387
/* total time is 10s/10,000ms.
1388
Converting to s from ms by dividing by 1,000,
1389
and ns to ms by dividing by 1,000,000. */
1390
block_time = ((retry_interval
1391
- ((intmax_t)waited_time.tv_sec * 1000))
1392
- ((intmax_t)waited_time.tv_nsec / 1000000));
1393
1394
if (debug){
1395
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1396
block_time);
1397
}
1398
1399
if(block_time <= 0){
1400
ret = start_mandos_communication(mc->current_server->ip,
1401
mc->current_server->port,
1402
mc->current_server->if_index,
1403
mc->current_server->af, mc);
1404
if(ret == 0){
1405
avahi_simple_poll_quit(s);
1406
return 0;
1407
}
1408
ret = clock_gettime(CLOCK_MONOTONIC,
1409
&mc->current_server->last_seen);
1410
if(ret == -1){
1411
perror_plus("clock_gettime");
1412
return -1;
1413
}
1414
mc->current_server = mc->current_server->next;
1415
block_time = 0; /* Call avahi to find new Mandos
1416
servers, but don't block */
1417
}
1418
1419
ret = avahi_simple_poll_iterate(s, (int)block_time);
1420
}
1421
if(ret != 0){
1422
if (ret > 0 or errno != EINTR){
1423
return (ret != 1) ? ret : 0;
1424
}
1425
}
1426
}
1427
}
1428
1429
/* Set effective uid to 0, return errno */
1430
error_t raise_privileges(void){
1431
error_t old_errno = errno;
1432
error_t ret_errno = 0;
1433
if(seteuid(0) == -1){
1434
ret_errno = errno;
1435
perror_plus("seteuid");
1436
}
1437
errno = old_errno;
1438
return ret_errno;
1439
}
1440
1441
/* Set effective and real user ID to 0. Return errno. */
1442
error_t raise_privileges_permanently(void){
1443
error_t old_errno = errno;
1444
error_t ret_errno = raise_privileges();
1445
if(ret_errno != 0){
1446
errno = old_errno;
1447
return ret_errno;
1448
}
1449
if(setuid(0) == -1){
1450
ret_errno = errno;
1451
perror_plus("seteuid");
1452
}
1453
errno = old_errno;
1454
return ret_errno;
1455
}
1456
1457
/* Set effective user ID to unprivileged saved user ID */
1458
error_t lower_privileges(void){
1459
error_t old_errno = errno;
1460
error_t ret_errno = 0;
1461
if(seteuid(uid) == -1){
1462
ret_errno = errno;
1463
perror_plus("seteuid");
1464
}
1465
errno = old_errno;
1466
return ret_errno;
1467
}
1468
1469
/* Lower privileges permanently */
1470
error_t lower_privileges_permanently(void){
1471
error_t old_errno = errno;
1472
error_t ret_errno = 0;
1473
if(setuid(uid) == -1){
1474
ret_errno = errno;
1475
perror_plus("setuid");
1476
}
1477
errno = old_errno;
1478
return ret_errno;
1479
}
1480
1481
bool run_network_hooks(const char *mode, const char *interface,
1482
const float delay){
1483
struct dirent **direntries;
1484
struct dirent *direntry;
1485
int ret;
1486
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1487
alphasort);
1488
if(numhooks == -1){
1489
if(errno == ENOENT){
1490
if(debug){
1491
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1492
" found\n", hookdir);
1493
}
1494
} else {
1495
perror_plus("scandir");
1496
}
1497
} else {
1498
int devnull = open("/dev/null", O_RDONLY);
1499
for(int i = 0; i < numhooks; i++){
1500
direntry = direntries[i];
1501
char *fullname = NULL;
1502
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1503
if(ret < 0){
1504
perror_plus("asprintf");
1505
continue;
1506
}
1507
if(debug){
1508
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1509
direntry->d_name);
1510
}
1511
pid_t hook_pid = fork();
1512
if(hook_pid == 0){
1513
/* Child */
1514
/* Raise privileges */
1515
raise_privileges_permanently();
1516
/* Set group */
1517
errno = 0;
1518
ret = setgid(0);
1519
if(ret == -1){
1520
perror_plus("setgid");
1521
}
1522
/* Reset supplementary groups */
1523
errno = 0;
1524
ret = setgroups(0, NULL);
1525
if(ret == -1){
1526
perror_plus("setgroups");
1527
}
1528
dup2(devnull, STDIN_FILENO);
1529
close(devnull);
1530
dup2(STDERR_FILENO, STDOUT_FILENO);
1531
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1532
if(ret == -1){
1533
perror_plus("setenv");
1534
_exit(EX_OSERR);
1535
}
1536
ret = setenv("DEVICE", interface, 1);
1537
if(ret == -1){
1538
perror_plus("setenv");
1539
_exit(EX_OSERR);
1540
}
1541
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1542
if(ret == -1){
1543
perror_plus("setenv");
1544
_exit(EX_OSERR);
1545
}
1546
ret = setenv("MODE", mode, 1);
1547
if(ret == -1){
1548
perror_plus("setenv");
1549
_exit(EX_OSERR);
1550
}
1551
char *delaystring;
1552
ret = asprintf(&delaystring, "%f", delay);
1553
if(ret == -1){
1554
perror_plus("asprintf");
1555
_exit(EX_OSERR);
1556
}
1557
ret = setenv("DELAY", delaystring, 1);
1558
if(ret == -1){
1559
free(delaystring);
1560
perror_plus("setenv");
1561
_exit(EX_OSERR);
1562
}
1563
free(delaystring);
1564
if(connect_to != NULL){
1565
ret = setenv("CONNECT", connect_to, 1);
1566
if(ret == -1){
1567
perror_plus("setenv");
1568
_exit(EX_OSERR);
1569
}
1570
}
1571
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1572
perror_plus("execl");
1573
_exit(EXIT_FAILURE);
1574
}
1575
} else {
1576
int status;
1577
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1578
perror_plus("waitpid");
1579
free(fullname);
1580
continue;
1581
}
1582
if(WIFEXITED(status)){
1583
if(WEXITSTATUS(status) != 0){
1584
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1585
" with status %d\n", direntry->d_name,
1586
WEXITSTATUS(status));
1587
free(fullname);
1588
continue;
1589
}
1590
} else if(WIFSIGNALED(status)){
1591
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1592
" signal %d\n", direntry->d_name,
1593
WTERMSIG(status));
1594
free(fullname);
1595
continue;
1596
} else {
1597
fprintf_plus(stderr, "Warning: network hook \"%s\""
1598
" crashed\n", direntry->d_name);
1599
free(fullname);
1600
continue;
1601
}
1602
}
1603
free(fullname);
1604
if(debug){
1605
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1606
direntry->d_name);
1607
}
1608
}
1609
close(devnull);
1610
}
1611
return true;
1612
}
1613
1614
error_t bring_up_interface(const char *const interface,
1615
const float delay){
1616
int sd = -1;
1617
error_t old_errno = errno;
1618
error_t ret_errno = 0;
1619
int ret, ret_setflags;
1620
struct ifreq network;
1621
unsigned int if_index = if_nametoindex(interface);
1622
if(if_index == 0){
1623
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1624
errno = old_errno;
1625
return ENXIO;
1626
}
1627
1628
if(quit_now){
1629
errno = old_errno;
1630
return EINTR;
1631
}
1632
1633
if(not interface_is_up(interface)){
1634
if(not get_flags(interface, &network) and debug){
1635
ret_errno = errno;
1636
fprintf_plus(stderr, "Failed to get flags for interface "
1637
"\"%s\"\n", interface);
1638
return ret_errno;
1639
}
1640
network.ifr_flags |= IFF_UP;
1641
1642
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1643
if(sd < 0){
1644
ret_errno = errno;
1645
perror_plus("socket");
1646
errno = old_errno;
1647
return ret_errno;
1648
}
1649
1650
if(quit_now){
918
1651
close(sd);
919
}
920
921
uid = getuid();
922
gid = getgid();
923
924
ret = setuid(uid);
925
if (ret == -1){
926
perror("setuid");
927
}
928
929
setgid(gid);
930
if (ret == -1){
931
perror("setgid");
932
}
933
934
if_index = (AvahiIfIndex) if_nametoindex(interface);
935
if(if_index == 0){
936
fprintf(stderr, "No such interface: \"%s\"\n", interface);
937
exit(EXIT_FAILURE);
938
}
939
940
if(connect_to != NULL){
941
/* Connect directly, do not use Zeroconf */
942
/* (Mainly meant for debugging) */
943
char *address = strrchr(connect_to, ':');
944
if(address == NULL){
945
fprintf(stderr, "No colon in address\n");
946
exitcode = EXIT_FAILURE;
947
goto end;
1652
errno = old_errno;
1653
return EINTR;
1654
}
1655
1656
if(debug){
1657
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1658
interface);
1659
}
1660
1661
/* Raise priviliges */
1662
raise_privileges();
1663
1664
#ifdef __linux__
1665
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1666
messages about the network interface to mess up the prompt */
1667
int ret_linux = klogctl(8, NULL, 5);
1668
bool restore_loglevel = true;
1669
if(ret_linux == -1){
1670
restore_loglevel = false;
1671
perror_plus("klogctl");
1672
}
1673
#endif /* __linux__ */
1674
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1675
ret_errno = errno;
1676
#ifdef __linux__
1677
if(restore_loglevel){
1678
ret_linux = klogctl(7, NULL, 0);
1679
if(ret_linux == -1){
1680
perror_plus("klogctl");
948
1681
}
1682
}
1683
#endif /* __linux__ */
1684
1685
/* Lower privileges */
1686
lower_privileges();
1687
1688
/* Close the socket */
1689
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1690
if(ret == -1){
1691
perror_plus("close");
1692
}
1693
1694
if(ret_setflags == -1){
1695
errno = ret_errno;
1696
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1697
errno = old_errno;
1698
return ret_errno;
1699
}
1700
} else if(debug){
1701
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1702
interface);
1703
}
1704
1705
/* Sleep checking until interface is running.
1706
Check every 0.25s, up to total time of delay */
1707
for(int i=0; i < delay * 4; i++){
1708
if(interface_is_running(interface)){
1709
break;
1710
}
1711
struct timespec sleeptime = { .tv_nsec = 250000000 };
1712
ret = nanosleep(&sleeptime, NULL);
1713
if(ret == -1 and errno != EINTR){
1714
perror_plus("nanosleep");
1715
}
1716
}
1717
1718
errno = old_errno;
1719
return 0;
1720
}
1721
1722
error_t take_down_interface(const char *const interface){
1723
int sd = -1;
1724
error_t old_errno = errno;
1725
error_t ret_errno = 0;
1726
int ret, ret_setflags;
1727
struct ifreq network;
1728
unsigned int if_index = if_nametoindex(interface);
1729
if(if_index == 0){
1730
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1731
errno = old_errno;
1732
return ENXIO;
1733
}
1734
if(interface_is_up(interface)){
1735
if(not get_flags(interface, &network) and debug){
1736
ret_errno = errno;
1737
fprintf_plus(stderr, "Failed to get flags for interface "
1738
"\"%s\"\n", interface);
1739
return ret_errno;
1740
}
1741
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1742
1743
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1744
if(sd < 0){
1745
ret_errno = errno;
1746
perror_plus("socket");
1747
errno = old_errno;
1748
return ret_errno;
1749
}
1750
1751
if(debug){
1752
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1753
interface);
1754
}
1755
1756
/* Raise priviliges */
1757
raise_privileges();
1758
1759
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1760
ret_errno = errno;
1761
1762
/* Lower privileges */
1763
lower_privileges();
1764
1765
/* Close the socket */
1766
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1767
if(ret == -1){
1768
perror_plus("close");
1769
}
1770
1771
if(ret_setflags == -1){
1772
errno = ret_errno;
1773
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1774
errno = old_errno;
1775
return ret_errno;
1776
}
1777
} else if(debug){
1778
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1779
interface);
1780
}
1781
1782
errno = old_errno;
1783
return 0;
1784
}
1785
1786
int main(int argc, char *argv[]){
1787
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1788
.priority = "SECURE256:!CTYPE-X.509:"
1789
"+CTYPE-OPENPGP", .current_server = NULL,
1790
.interfaces = NULL, .interfaces_size = 0 };
1791
AvahiSServiceBrowser *sb = NULL;
1792
error_t ret_errno;
1793
int ret;
1794
intmax_t tmpmax;
1795
char *tmp;
1796
int exitcode = EXIT_SUCCESS;
1797
char *interfaces_to_take_down = NULL;
1798
size_t interfaces_to_take_down_size = 0;
1799
char tempdir[] = "/tmp/mandosXXXXXX";
1800
bool tempdir_created = false;
1801
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1802
const char *seckey = PATHDIR "/" SECKEY;
1803
const char *pubkey = PATHDIR "/" PUBKEY;
1804
char *interfaces_hooks = NULL;
1805
size_t interfaces_hooks_size = 0;
1806
1807
bool gnutls_initialized = false;
1808
bool gpgme_initialized = false;
1809
float delay = 2.5f;
1810
double retry_interval = 10; /* 10s between trying a server and
1811
retrying the same server again */
1812
1813
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1814
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1815
1816
uid = getuid();
1817
gid = getgid();
1818
1819
/* Lower any group privileges we might have, just to be safe */
1820
errno = 0;
1821
ret = setgid(gid);
1822
if(ret == -1){
1823
perror_plus("setgid");
1824
}
1825
1826
/* Lower user privileges (temporarily) */
1827
errno = 0;
1828
ret = seteuid(uid);
1829
if(ret == -1){
1830
perror_plus("seteuid");
1831
}
1832
1833
if(quit_now){
1834
goto end;
1835
}
1836
1837
{
1838
struct argp_option options[] = {
1839
{ .name = "debug", .key = 128,
1840
.doc = "Debug mode", .group = 3 },
1841
{ .name = "connect", .key = 'c',
1842
.arg = "ADDRESS:PORT",
1843
.doc = "Connect directly to a specific Mandos server",
1844
.group = 1 },
1845
{ .name = "interface", .key = 'i',
1846
.arg = "NAME",
1847
.doc = "Network interface that will be used to search for"
1848
" Mandos servers",
1849
.group = 1 },
1850
{ .name = "seckey", .key = 's',
1851
.arg = "FILE",
1852
.doc = "OpenPGP secret key file base name",
1853
.group = 1 },
1854
{ .name = "pubkey", .key = 'p',
1855
.arg = "FILE",
1856
.doc = "OpenPGP public key file base name",
1857
.group = 2 },
1858
{ .name = "dh-bits", .key = 129,
1859
.arg = "BITS",
1860
.doc = "Bit length of the prime number used in the"
1861
" Diffie-Hellman key exchange",
1862
.group = 2 },
1863
{ .name = "priority", .key = 130,
1864
.arg = "STRING",
1865
.doc = "GnuTLS priority string for the TLS handshake",
1866
.group = 1 },
1867
{ .name = "delay", .key = 131,
1868
.arg = "SECONDS",
1869
.doc = "Maximum delay to wait for interface startup",
1870
.group = 2 },
1871
{ .name = "retry", .key = 132,
1872
.arg = "SECONDS",
1873
.doc = "Retry interval used when denied by the Mandos server",
1874
.group = 2 },
1875
{ .name = "network-hook-dir", .key = 133,
1876
.arg = "DIR",
1877
.doc = "Directory where network hooks are located",
1878
.group = 2 },
1879
/*
1880
* These reproduce what we would get without ARGP_NO_HELP
1881
*/
1882
{ .name = "help", .key = '?',
1883
.doc = "Give this help list", .group = -1 },
1884
{ .name = "usage", .key = -3,
1885
.doc = "Give a short usage message", .group = -1 },
1886
{ .name = "version", .key = 'V',
1887
.doc = "Print program version", .group = -1 },
1888
{ .name = NULL }
1889
};
1890
1891
error_t parse_opt(int key, char *arg,
1892
struct argp_state *state){
949
1893
errno = 0;
950
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
951
if(errno){
952
perror("Bad port number");
953
exitcode = EXIT_FAILURE;
1894
switch(key){
1895
case 128: /* --debug */
1896
debug = true;
1897
break;
1898
case 'c': /* --connect */
1899
connect_to = arg;
1900
break;
1901
case 'i': /* --interface */
1902
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1903
arg, (int)',');
1904
if(ret_errno != 0){
1905
argp_error(state, "%s", strerror(ret_errno));
1906
}
1907
break;
1908
case 's': /* --seckey */
1909
seckey = arg;
1910
break;
1911
case 'p': /* --pubkey */
1912
pubkey = arg;
1913
break;
1914
case 129: /* --dh-bits */
1915
errno = 0;
1916
tmpmax = strtoimax(arg, &tmp, 10);
1917
if(errno != 0 or tmp == arg or *tmp != '\0'
1918
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1919
argp_error(state, "Bad number of DH bits");
1920
}
1921
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1922
break;
1923
case 130: /* --priority */
1924
mc.priority = arg;
1925
break;
1926
case 131: /* --delay */
1927
errno = 0;
1928
delay = strtof(arg, &tmp);
1929
if(errno != 0 or tmp == arg or *tmp != '\0'){
1930
argp_error(state, "Bad delay");
1931
}
1932
case 132: /* --retry */
1933
errno = 0;
1934
retry_interval = strtod(arg, &tmp);
1935
if(errno != 0 or tmp == arg or *tmp != '\0'
1936
or (retry_interval * 1000) > INT_MAX
1937
or retry_interval < 0){
1938
argp_error(state, "Bad retry interval");
1939
}
1940
break;
1941
case 133: /* --network-hook-dir */
1942
hookdir = arg;
1943
break;
1944
/*
1945
* These reproduce what we would get without ARGP_NO_HELP
1946
*/
1947
case '?': /* --help */
1948
argp_state_help(state, state->out_stream,
1949
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1950
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1951
case -3: /* --usage */
1952
argp_state_help(state, state->out_stream,
1953
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1954
case 'V': /* --version */
1955
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1956
exit(argp_err_exit_status);
1957
break;
1958
default:
1959
return ARGP_ERR_UNKNOWN;
1960
}
1961
return errno;
1962
}
1963
1964
struct argp argp = { .options = options, .parser = parse_opt,
1965
.args_doc = "",
1966
.doc = "Mandos client -- Get and decrypt"
1967
" passwords from a Mandos server" };
1968
ret = argp_parse(&argp, argc, argv,
1969
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1970
switch(ret){
1971
case 0:
1972
break;
1973
case ENOMEM:
1974
default:
1975
errno = ret;
1976
perror_plus("argp_parse");
1977
exitcode = EX_OSERR;
1978
goto end;
1979
case EINVAL:
1980
exitcode = EX_USAGE;
1981
goto end;
1982
}
1983
}
1984
1985
{
1986
/* Work around Debian bug #633582:
1987
<http://bugs.debian.org/633582> */
1988
1989
/* Re-raise priviliges */
1990
if(raise_privileges() == 0){
1991
struct stat st;
1992
1993
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1994
int seckey_fd = open(seckey, O_RDONLY);
1995
if(seckey_fd == -1){
1996
perror_plus("open");
1997
} else {
1998
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1999
if(ret == -1){
2000
perror_plus("fstat");
2001
} else {
2002
if(S_ISREG(st.st_mode)
2003
and st.st_uid == 0 and st.st_gid == 0){
2004
ret = fchown(seckey_fd, uid, gid);
2005
if(ret == -1){
2006
perror_plus("fchown");
2007
}
2008
}
2009
}
2010
TEMP_FAILURE_RETRY(close(seckey_fd));
2011
}
2012
}
2013
2014
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2015
int pubkey_fd = open(pubkey, O_RDONLY);
2016
if(pubkey_fd == -1){
2017
perror_plus("open");
2018
} else {
2019
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2020
if(ret == -1){
2021
perror_plus("fstat");
2022
} else {
2023
if(S_ISREG(st.st_mode)
2024
and st.st_uid == 0 and st.st_gid == 0){
2025
ret = fchown(pubkey_fd, uid, gid);
2026
if(ret == -1){
2027
perror_plus("fchown");
2028
}
2029
}
2030
}
2031
TEMP_FAILURE_RETRY(close(pubkey_fd));
2032
}
2033
}
2034
2035
/* Lower privileges */
2036
lower_privileges();
2037
}
2038
}
2039
2040
/* Remove invalid interface names (except "none") */
2041
{
2042
char *interface = NULL;
2043
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2044
interface))){
2045
if(strcmp(interface, "none") != 0
2046
and if_nametoindex(interface) == 0){
2047
if(interface[0] != '\0'){
2048
fprintf_plus(stderr, "Not using nonexisting interface"
2049
" \"%s\"\n", interface);
2050
}
2051
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2052
interface = NULL;
2053
}
2054
}
2055
}
2056
2057
/* Run network hooks */
2058
{
2059
if(mc.interfaces != NULL){
2060
interfaces_hooks = malloc(mc.interfaces_size);
2061
if(interfaces_hooks == NULL){
2062
perror_plus("malloc");
954
2063
goto end;
955
2064
}
956
*address = '\0';
957
address = connect_to;
958
ret = start_mandos_communication(address, port, if_index, &mc);
959
if(ret < 0){
960
exitcode = EXIT_FAILURE;
961
} else {
962
exitcode = EXIT_SUCCESS;
963
}
964
goto end;
965
}
966
967
if (not debug){
968
avahi_set_log_function(empty_log);
969
}
970
971
/* Initialize the pseudo-RNG for Avahi */
972
srand((unsigned int) time(NULL));
973
974
/* Allocate main Avahi loop object */
975
mc.simple_poll = avahi_simple_poll_new();
976
if (mc.simple_poll == NULL) {
977
fprintf(stderr, "Avahi: Failed to create simple poll"
978
" object.\n");
979
exitcode = EXIT_FAILURE;
980
goto end;
981
}
982
983
{
984
AvahiServerConfig config;
985
/* Do not publish any local Zeroconf records */
986
avahi_server_config_init(&config);
987
config.publish_hinfo = 0;
988
config.publish_addresses = 0;
989
config.publish_workstation = 0;
990
config.publish_domain = 0;
991
992
/* Allocate a new server */
993
mc.server = avahi_server_new(avahi_simple_poll_get
994
(mc.simple_poll), &config, NULL,
995
NULL, &error);
996
997
/* Free the Avahi configuration data */
998
avahi_server_config_free(&config);
999
}
1000
1001
/* Check if creating the Avahi server object succeeded */
1002
if (mc.server == NULL) {
1003
fprintf(stderr, "Failed to create Avahi server: %s\n",
1004
avahi_strerror(error));
1005
exitcode = EXIT_FAILURE;
1006
goto end;
1007
}
1008
1009
/* Create the Avahi service browser */
1010
sb = avahi_s_service_browser_new(mc.server, if_index,
1011
AVAHI_PROTO_INET6,
1012
"_mandos._tcp", NULL, 0,
1013
browse_callback, &mc);
1014
if (sb == NULL) {
1015
fprintf(stderr, "Failed to create service browser: %s\n",
1016
avahi_strerror(avahi_server_errno(mc.server)));
1017
exitcode = EXIT_FAILURE;
1018
goto end;
1019
}
1020
1021
/* Run the main loop */
1022
1023
if (debug){
1024
fprintf(stderr, "Starting Avahi loop search\n");
1025
}
1026
1027
avahi_simple_poll_loop(mc.simple_poll);
1028
2065
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2066
interfaces_hooks_size = mc.interfaces_size;
2067
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2068
(int)',');
2069
}
2070
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2071
interfaces_hooks : "", delay)){
2072
goto end;
2073
}
2074
}
2075
2076
if(not debug){
2077
avahi_set_log_function(empty_log);
2078
}
2079
2080
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2081
from the signal handler */
2082
/* Initialize the pseudo-RNG for Avahi */
2083
srand((unsigned int) time(NULL));
2084
simple_poll = avahi_simple_poll_new();
2085
if(simple_poll == NULL){
2086
fprintf_plus(stderr,
2087
"Avahi: Failed to create simple poll object.\n");
2088
exitcode = EX_UNAVAILABLE;
2089
goto end;
2090
}
2091
2092
sigemptyset(&sigterm_action.sa_mask);
2093
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2094
if(ret == -1){
2095
perror_plus("sigaddset");
2096
exitcode = EX_OSERR;
2097
goto end;
2098
}
2099
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2100
if(ret == -1){
2101
perror_plus("sigaddset");
2102
exitcode = EX_OSERR;
2103
goto end;
2104
}
2105
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2106
if(ret == -1){
2107
perror_plus("sigaddset");
2108
exitcode = EX_OSERR;
2109
goto end;
2110
}
2111
/* Need to check if the handler is SIG_IGN before handling:
2112
| [[info:libc:Initial Signal Actions]] |
2113
| [[info:libc:Basic Signal Handling]] |
2114
*/
2115
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2116
if(ret == -1){
2117
perror_plus("sigaction");
2118
return EX_OSERR;
2119
}
2120
if(old_sigterm_action.sa_handler != SIG_IGN){
2121
ret = sigaction(SIGINT, &sigterm_action, NULL);
2122
if(ret == -1){
2123
perror_plus("sigaction");
2124
exitcode = EX_OSERR;
2125
goto end;
2126
}
2127
}
2128
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2129
if(ret == -1){
2130
perror_plus("sigaction");
2131
return EX_OSERR;
2132
}
2133
if(old_sigterm_action.sa_handler != SIG_IGN){
2134
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2135
if(ret == -1){
2136
perror_plus("sigaction");
2137
exitcode = EX_OSERR;
2138
goto end;
2139
}
2140
}
2141
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2142
if(ret == -1){
2143
perror_plus("sigaction");
2144
return EX_OSERR;
2145
}
2146
if(old_sigterm_action.sa_handler != SIG_IGN){
2147
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2148
if(ret == -1){
2149
perror_plus("sigaction");
2150
exitcode = EX_OSERR;
2151
goto end;
2152
}
2153
}
2154
2155
/* If no interfaces were specified, make a list */
2156
if(mc.interfaces == NULL){
2157
struct dirent **direntries;
2158
/* Look for any good interfaces */
2159
ret = scandir(sys_class_net, &direntries, good_interface,
2160
alphasort);
2161
if(ret >= 1){
2162
/* Add all found interfaces to interfaces list */
2163
for(int i = 0; i < ret; ++i){
2164
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2165
direntries[i]->d_name);
2166
if(ret_errno != 0){
2167
perror_plus("argz_add");
2168
continue;
2169
}
2170
if(debug){
2171
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2172
direntries[i]->d_name);
2173
}
2174
}
2175
free(direntries);
2176
} else {
2177
free(direntries);
2178
fprintf_plus(stderr, "Could not find a network interface\n");
2179
exitcode = EXIT_FAILURE;
2180
goto end;
2181
}
2182
}
2183
2184
/* Bring up interfaces which are down */
2185
{
2186
char *interface = NULL;
2187
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2188
interface))){
2189
/* If interface name is "none", stop bringing up interfaces.
2190
Also remove all instances of "none" from the list */
2191
if(strcmp(interface, "none") == 0){
2192
argz_delete(&mc.interfaces, &mc.interfaces_size,
2193
interface);
2194
interface = NULL;
2195
while((interface = argz_next(mc.interfaces,
2196
mc.interfaces_size, interface))){
2197
if(strcmp(interface, "none") == 0){
2198
argz_delete(&mc.interfaces, &mc.interfaces_size,
2199
interface);
2200
interface = NULL;
2201
}
2202
}
2203
break;
2204
}
2205
bool interface_was_up = interface_is_up(interface);
2206
ret = bring_up_interface(interface, delay);
2207
if(not interface_was_up){
2208
if(ret != 0){
2209
errno = ret;
2210
perror_plus("Failed to bring up interface");
2211
} else {
2212
ret_errno = argz_add(&interfaces_to_take_down,
2213
&interfaces_to_take_down_size,
2214
interface);
2215
}
2216
}
2217
}
2218
if(debug and (interfaces_to_take_down == NULL)){
2219
fprintf_plus(stderr, "No interfaces were brought up\n");
2220
}
2221
}
2222
2223
/* If we only got one interface, explicitly use only that one */
2224
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2225
if(debug){
2226
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2227
mc.interfaces);
2228
}
2229
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2230
}
2231
2232
if(quit_now){
2233
goto end;
2234
}
2235
2236
ret = init_gnutls_global(pubkey, seckey, &mc);
2237
if(ret == -1){
2238
fprintf_plus(stderr, "init_gnutls_global failed\n");
2239
exitcode = EX_UNAVAILABLE;
2240
goto end;
2241
} else {
2242
gnutls_initialized = true;
2243
}
2244
2245
if(quit_now){
2246
goto end;
2247
}
2248
2249
if(mkdtemp(tempdir) == NULL){
2250
perror_plus("mkdtemp");
2251
goto end;
2252
}
2253
tempdir_created = true;
2254
2255
if(quit_now){
2256
goto end;
2257
}
2258
2259
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2260
fprintf_plus(stderr, "init_gpgme failed\n");
2261
exitcode = EX_UNAVAILABLE;
2262
goto end;
2263
} else {
2264
gpgme_initialized = true;
2265
}
2266
2267
if(quit_now){
2268
goto end;
2269
}
2270
2271
if(connect_to != NULL){
2272
/* Connect directly, do not use Zeroconf */
2273
/* (Mainly meant for debugging) */
2274
char *address = strrchr(connect_to, ':');
2275
2276
if(address == NULL){
2277
fprintf_plus(stderr, "No colon in address\n");
2278
exitcode = EX_USAGE;
2279
goto end;
2280
}
2281
2282
if(quit_now){
2283
goto end;
2284
}
2285
2286
in_port_t port;
2287
errno = 0;
2288
tmpmax = strtoimax(address+1, &tmp, 10);
2289
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2290
or tmpmax != (in_port_t)tmpmax){
2291
fprintf_plus(stderr, "Bad port number\n");
2292
exitcode = EX_USAGE;
2293
goto end;
2294
}
2295
2296
if(quit_now){
2297
goto end;
2298
}
2299
2300
port = (in_port_t)tmpmax;
2301
*address = '\0';
2302
/* Colon in address indicates IPv6 */
2303
int af;
2304
if(strchr(connect_to, ':') != NULL){
2305
af = AF_INET6;
2306
/* Accept [] around IPv6 address - see RFC 5952 */
2307
if(connect_to[0] == '[' and address[-1] == ']')
2308
{
2309
connect_to++;
2310
address[-1] = '\0';
2311
}
2312
} else {
2313
af = AF_INET;
2314
}
2315
address = connect_to;
2316
2317
if(quit_now){
2318
goto end;
2319
}
2320
2321
while(not quit_now){
2322
ret = start_mandos_communication(address, port, if_index, af,
2323
&mc);
2324
if(quit_now or ret == 0){
2325
break;
2326
}
2327
if(debug){
2328
fprintf_plus(stderr, "Retrying in %d seconds\n",
2329
(int)retry_interval);
2330
}
2331
sleep((int)retry_interval);
2332
}
2333
2334
if (not quit_now){
2335
exitcode = EXIT_SUCCESS;
2336
}
2337
2338
goto end;
2339
}
2340
2341
if(quit_now){
2342
goto end;
2343
}
2344
2345
{
2346
AvahiServerConfig config;
2347
/* Do not publish any local Zeroconf records */
2348
avahi_server_config_init(&config);
2349
config.publish_hinfo = 0;
2350
config.publish_addresses = 0;
2351
config.publish_workstation = 0;
2352
config.publish_domain = 0;
2353
2354
/* Allocate a new server */
2355
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2356
&config, NULL, NULL, &ret_errno);
2357
2358
/* Free the Avahi configuration data */
2359
avahi_server_config_free(&config);
2360
}
2361
2362
/* Check if creating the Avahi server object succeeded */
2363
if(mc.server == NULL){
2364
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2365
avahi_strerror(ret_errno));
2366
exitcode = EX_UNAVAILABLE;
2367
goto end;
2368
}
2369
2370
if(quit_now){
2371
goto end;
2372
}
2373
2374
/* Create the Avahi service browser */
2375
sb = avahi_s_service_browser_new(mc.server, if_index,
2376
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2377
NULL, 0, browse_callback,
2378
(void *)&mc);
2379
if(sb == NULL){
2380
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2381
avahi_strerror(avahi_server_errno(mc.server)));
2382
exitcode = EX_UNAVAILABLE;
2383
goto end;
2384
}
2385
2386
if(quit_now){
2387
goto end;
2388
}
2389
2390
/* Run the main loop */
2391
2392
if(debug){
2393
fprintf_plus(stderr, "Starting Avahi loop search\n");
2394
}
2395
2396
ret = avahi_loop_with_timeout(simple_poll,
2397
(int)(retry_interval * 1000), &mc);
2398
if(debug){
2399
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2400
(ret == 0) ? "successfully" : "with error");
2401
}
2402
1029
2403
end:
1030
1031
if (debug){
1032
fprintf(stderr, "%s exiting\n", argv[0]);
1033
}
1034
1035
/* Cleanup things */
1036
if (sb != NULL)
1037
avahi_s_service_browser_free(sb);
1038
1039
if (mc.server != NULL)
1040
avahi_server_free(mc.server);
1041
1042
if (mc.simple_poll != NULL)
1043
avahi_simple_poll_free(mc.simple_poll);
1044
free(pubkeyfilename);
1045
free(seckeyfilename);
1046
1047
if (gnutls_initalized){
1048
gnutls_certificate_free_credentials(mc.cred);
1049
gnutls_global_deinit ();
1050
}
1051
1052
return exitcode;
2404
2405
if(debug){
2406
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2407
}
2408
2409
/* Cleanup things */
2410
free(mc.interfaces);
2411
2412
if(sb != NULL)
2413
avahi_s_service_browser_free(sb);
2414
2415
if(mc.server != NULL)
2416
avahi_server_free(mc.server);
2417
2418
if(simple_poll != NULL)
2419
avahi_simple_poll_free(simple_poll);
2420
2421
if(gnutls_initialized){
2422
gnutls_certificate_free_credentials(mc.cred);
2423
gnutls_global_deinit();
2424
gnutls_dh_params_deinit(mc.dh_params);
2425
}
2426
2427
if(gpgme_initialized){
2428
gpgme_release(mc.ctx);
2429
}
2430
2431
/* Cleans up the circular linked list of Mandos servers the client
2432
has seen */
2433
if(mc.current_server != NULL){
2434
mc.current_server->prev->next = NULL;
2435
while(mc.current_server != NULL){
2436
server *next = mc.current_server->next;
2437
free(mc.current_server);
2438
mc.current_server = next;
2439
}
2440
}
2441
2442
/* Re-raise priviliges */
2443
{
2444
raise_privileges();
2445
2446
/* Run network hooks */
2447
run_network_hooks("stop", interfaces_hooks != NULL ?
2448
interfaces_hooks : "", delay);
2449
2450
/* Take down the network interfaces which were brought up */
2451
{
2452
char *interface = NULL;
2453
while((interface=argz_next(interfaces_to_take_down,
2454
interfaces_to_take_down_size,
2455
interface))){
2456
ret_errno = take_down_interface(interface);
2457
if(ret_errno != 0){
2458
errno = ret_errno;
2459
perror_plus("Failed to take down interface");
2460
}
2461
}
2462
if(debug and (interfaces_to_take_down == NULL)){
2463
fprintf_plus(stderr, "No interfaces needed to be taken"
2464
" down\n");
2465
}
2466
}
2467
2468
lower_privileges_permanently();
2469
}
2470
2471
free(interfaces_to_take_down);
2472
free(interfaces_hooks);
2473
2474
/* Removes the GPGME temp directory and all files inside */
2475
if(tempdir_created){
2476
struct dirent **direntries = NULL;
2477
struct dirent *direntry = NULL;
2478
int numentries = scandir(tempdir, &direntries, notdotentries,
2479
alphasort);
2480
if (numentries > 0){
2481
for(int i = 0; i < numentries; i++){
2482
direntry = direntries[i];
2483
char *fullname = NULL;
2484
ret = asprintf(&fullname, "%s/%s", tempdir,
2485
direntry->d_name);
2486
if(ret < 0){
2487
perror_plus("asprintf");
2488
continue;
2489
}
2490
ret = remove(fullname);
2491
if(ret == -1){
2492
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2493
strerror(errno));
2494
}
2495
free(fullname);
2496
}
2497
}
2498
2499
/* need to clean even if 0 because man page doesn't specify */
2500
free(direntries);
2501
if (numentries == -1){
2502
perror_plus("scandir");
2503
}
2504
ret = rmdir(tempdir);
2505
if(ret == -1 and errno != ENOENT){
2506
perror_plus("rmdir");
2507
}
2508
}
2509
2510
if(quit_now){
2511
sigemptyset(&old_sigterm_action.sa_mask);
2512
old_sigterm_action.sa_handler = SIG_DFL;
2513
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2514
&old_sigterm_action,
2515
NULL));
2516
if(ret == -1){
2517
perror_plus("sigaction");
2518
}
2519
do {
2520
ret = raise(signal_received);
2521
} while(ret != 0 and errno == EINTR);
2522
if(ret != 0){
2523
perror_plus("raise");
2524
abort();
2525
}
2526
TEMP_FAILURE_RETRY(pause());
2527
}
2528
2529
return exitcode;
1053
2530
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0