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- Committer: Teddy Hogeborn
- Date: 2014-06-07 21:59:20 UTC
- Revision ID: teddy@recompile.se-20140607215920-r4qkj7ktnjyqmrn5
Make mandos-client use fexecve().
* plugins.d/mandos-client.d (run_network_hooks): Use fexecve().
* plugins.d/mandos-client.d (run_network_hooks): Use fexecve().
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- debian/upstream
- 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 © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 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 /* not _LARGEFILE_SOURCE */
36
#ifndef _FILE_OFFSET_BITS
33
37
#define _FILE_OFFSET_BITS 64
38
#endif /* not _FILE_OFFSET_BITS */
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
getnameinfo() */
60
#include <fcntl.h> /* open() */
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
*/
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
strtoimax() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
58
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
59
69
SIOCSIFFLAGS, if_indextoname(),
60
70
if_nametoindex(), IF_NAMESIZE */
71
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
*/
61
74
#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 */
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons() */
78
#include <iso646.h> /* not, or, and */
67
79
#include <argp.h> /* struct argp_option, error_t, struct
68
80
argp_state, struct argp,
69
81
argp_parse(), ARGP_KEY_ARG,
70
82
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
83
#include <signal.h> /* sigemptyset(), sigaddset(),
84
sigaction(), SIGTERM, sig_atomic_t,
85
raise() */
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
WEXITSTATUS(), WTERMSIG() */
90
#include <grp.h> /* setgroups() */
91
#include <argz.h> /* argz_add_sep(), argz_next(),
92
argz_delete(), argz_append(),
93
argz_stringify(), argz_add(),
94
argz_count() */
95
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
96
EAI_SYSTEM, gai_strerror() */
97
98
#ifdef __linux__
99
#include <sys/klog.h> /* klogctl() */
100
#endif /* __linux__ */
71
101
72
102
/* Avahi */
73
103
/* All Avahi types, constants and functions
86
116
gnutls_*
87
117
init_gnutls_session(),
88
118
GNUTLS_* */
89
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
90
GNUTLS_OPENPGP_FMT_BASE64 */
119
#include <gnutls/openpgp.h>
120
/* gnutls_certificate_set_openpgp_key_file(),
121
GNUTLS_OPENPGP_FMT_BASE64 */
91
122
92
123
/* GPGME */
93
124
#include <gpgme.h> /* All GPGME types, constants and
98
129
99
130
#define BUFFER_SIZE 256
100
131
132
#define PATHDIR "/conf/conf.d/mandos"
133
#define SECKEY "seckey.txt"
134
#define PUBKEY "pubkey.txt"
135
#define HOOKDIR "/lib/mandos/network-hooks.d"
136
101
137
bool debug = false;
102
static const char *keydir = "/conf/conf.d/mandos";
103
138
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>";
139
const char *argp_program_version = "mandos-client " VERSION;
140
const char *argp_program_bug_address = "<mandos@recompile.se>";
141
static const char sys_class_net[] = "/sys/class/net";
142
char *connect_to = NULL;
143
const char *hookdir = HOOKDIR;
144
int hookdir_fd = -1;
145
uid_t uid = 65534;
146
gid_t gid = 65534;
147
148
/* Doubly linked list that need to be circularly linked when used */
149
typedef struct server{
150
const char *ip;
151
in_port_t port;
152
AvahiIfIndex if_index;
153
int af;
154
struct timespec last_seen;
155
struct server *next;
156
struct server *prev;
157
} server;
106
158
107
159
/* Used for passing in values through the Avahi callback functions */
108
160
typedef struct {
109
AvahiSimplePoll *simple_poll;
110
161
AvahiServer *server;
111
162
gnutls_certificate_credentials_t cred;
112
163
unsigned int dh_bits;
113
164
gnutls_dh_params_t dh_params;
114
165
const char *priority;
166
gpgme_ctx_t ctx;
167
server *current_server;
168
char *interfaces;
169
size_t interfaces_size;
115
170
} mandos_context;
116
171
172
/* global so signal handler can reach it*/
173
AvahiSimplePoll *simple_poll;
174
175
sig_atomic_t quit_now = 0;
176
int signal_received = 0;
177
178
/* Function to use when printing errors */
179
void perror_plus(const char *print_text){
180
int e = errno;
181
fprintf(stderr, "Mandos plugin %s: ",
182
program_invocation_short_name);
183
errno = e;
184
perror(print_text);
185
}
186
187
__attribute__((format (gnu_printf, 2, 3), nonnull))
188
int fprintf_plus(FILE *stream, const char *format, ...){
189
va_list ap;
190
va_start (ap, format);
191
192
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
193
program_invocation_short_name));
194
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
195
}
196
117
197
/*
118
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
119
* "buffer_capacity" is how much is currently allocated,
198
* Make additional room in "buffer" for at least BUFFER_SIZE more
199
* bytes. "buffer_capacity" is how much is currently allocated,
120
200
* "buffer_length" is how much is already used.
121
201
*/
122
size_t adjustbuffer(char **buffer, size_t buffer_length,
123
size_t buffer_capacity){
124
if (buffer_length + BUFFER_SIZE > buffer_capacity){
125
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
126
if (buffer == NULL){
202
__attribute__((nonnull, warn_unused_result))
203
size_t incbuffer(char **buffer, size_t buffer_length,
204
size_t buffer_capacity){
205
if(buffer_length + BUFFER_SIZE > buffer_capacity){
206
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
207
if(new_buf == NULL){
208
int old_errno = errno;
209
free(*buffer);
210
errno = old_errno;
211
*buffer = NULL;
127
212
return 0;
128
213
}
214
*buffer = new_buf;
129
215
buffer_capacity += BUFFER_SIZE;
130
216
}
131
217
return buffer_capacity;
132
218
}
133
219
220
/* Add server to set of servers to retry periodically */
221
__attribute__((nonnull, warn_unused_result))
222
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
223
int af, server **current_server){
224
int ret;
225
server *new_server = malloc(sizeof(server));
226
if(new_server == NULL){
227
perror_plus("malloc");
228
return false;
229
}
230
*new_server = (server){ .ip = strdup(ip),
231
.port = port,
232
.if_index = if_index,
233
.af = af };
234
if(new_server->ip == NULL){
235
perror_plus("strdup");
236
return false;
237
}
238
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
239
if(ret == -1){
240
perror_plus("clock_gettime");
241
return false;
242
}
243
/* Special case of first server */
244
if(*current_server == NULL){
245
new_server->next = new_server;
246
new_server->prev = new_server;
247
*current_server = new_server;
248
} else {
249
/* Place the new server last in the list */
250
new_server->next = *current_server;
251
new_server->prev = (*current_server)->prev;
252
new_server->prev->next = new_server;
253
(*current_server)->prev = new_server;
254
}
255
return true;
256
}
257
134
258
/*
135
* Decrypt OpenPGP data using keyrings in HOMEDIR.
136
* Returns -1 on error
259
* Initialize GPGME.
137
260
*/
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;
261
__attribute__((nonnull, warn_unused_result))
262
static bool init_gpgme(const char * const seckey,
263
const char * const pubkey,
264
const char * const tempdir,
265
mandos_context *mc){
144
266
gpgme_error_t rc;
145
ssize_t ret;
146
size_t plaintext_capacity = 0;
147
ssize_t plaintext_length = 0;
148
267
gpgme_engine_info_t engine_info;
149
268
150
if (debug){
151
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
269
/*
270
* Helper function to insert pub and seckey to the engine keyring.
271
*/
272
bool import_key(const char * const filename){
273
int ret;
274
int fd;
275
gpgme_data_t pgp_data;
276
277
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
278
if(fd == -1){
279
perror_plus("open");
280
return false;
281
}
282
283
rc = gpgme_data_new_from_fd(&pgp_data, fd);
284
if(rc != GPG_ERR_NO_ERROR){
285
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
286
gpgme_strsource(rc), gpgme_strerror(rc));
287
return false;
288
}
289
290
rc = gpgme_op_import(mc->ctx, pgp_data);
291
if(rc != GPG_ERR_NO_ERROR){
292
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
293
gpgme_strsource(rc), gpgme_strerror(rc));
294
return false;
295
}
296
297
ret = (int)TEMP_FAILURE_RETRY(close(fd));
298
if(ret == -1){
299
perror_plus("close");
300
}
301
gpgme_data_release(pgp_data);
302
return true;
303
}
304
305
if(debug){
306
fprintf_plus(stderr, "Initializing GPGME\n");
152
307
}
153
308
154
309
/* Init GPGME */
155
310
gpgme_check_version(NULL);
156
311
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;
312
if(rc != GPG_ERR_NO_ERROR){
313
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
314
gpgme_strsource(rc), gpgme_strerror(rc));
315
return false;
161
316
}
162
317
163
318
/* 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;
319
rc = gpgme_get_engine_info(&engine_info);
320
if(rc != GPG_ERR_NO_ERROR){
321
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
322
gpgme_strsource(rc), gpgme_strerror(rc));
323
return false;
169
324
}
170
325
while(engine_info != NULL){
171
326
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
172
327
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
173
engine_info->file_name, homedir);
328
engine_info->file_name, tempdir);
174
329
break;
175
330
}
176
331
engine_info = engine_info->next;
177
332
}
178
333
if(engine_info == NULL){
179
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
180
return -1;
334
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
335
tempdir);
336
return false;
337
}
338
339
/* Create new GPGME "context" */
340
rc = gpgme_new(&(mc->ctx));
341
if(rc != GPG_ERR_NO_ERROR){
342
fprintf_plus(stderr, "Mandos plugin mandos-client: "
343
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
344
gpgme_strerror(rc));
345
return false;
346
}
347
348
if(not import_key(pubkey) or not import_key(seckey)){
349
return false;
350
}
351
352
return true;
353
}
354
355
/*
356
* Decrypt OpenPGP data.
357
* Returns -1 on error
358
*/
359
__attribute__((nonnull, warn_unused_result))
360
static ssize_t pgp_packet_decrypt(const char *cryptotext,
361
size_t crypto_size,
362
char **plaintext,
363
mandos_context *mc){
364
gpgme_data_t dh_crypto, dh_plain;
365
gpgme_error_t rc;
366
ssize_t ret;
367
size_t plaintext_capacity = 0;
368
ssize_t plaintext_length = 0;
369
370
if(debug){
371
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
181
372
}
182
373
183
374
/* Create new GPGME data buffer from memory cryptotext */
184
375
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
185
376
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));
377
if(rc != GPG_ERR_NO_ERROR){
378
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
379
gpgme_strsource(rc), gpgme_strerror(rc));
189
380
return -1;
190
381
}
191
382
192
383
/* Create new empty GPGME data buffer for the plaintext */
193
384
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));
385
if(rc != GPG_ERR_NO_ERROR){
386
fprintf_plus(stderr, "Mandos plugin mandos-client: "
387
"bad gpgme_data_new: %s: %s\n",
388
gpgme_strsource(rc), gpgme_strerror(rc));
197
389
gpgme_data_release(dh_crypto);
198
390
return -1;
199
391
}
200
392
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
393
/* Decrypt data from the cryptotext data buffer to the plaintext
211
394
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));
395
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
396
if(rc != GPG_ERR_NO_ERROR){
397
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
398
gpgme_strsource(rc), gpgme_strerror(rc));
216
399
plaintext_length = -1;
217
if (debug){
400
if(debug){
218
401
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");
402
result = gpgme_op_decrypt_result(mc->ctx);
403
if(result == NULL){
404
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
222
405
} 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);
406
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
407
result->unsupported_algorithm);
408
fprintf_plus(stderr, "Wrong key usage: %u\n",
409
result->wrong_key_usage);
227
410
if(result->file_name != NULL){
228
fprintf(stderr, "File name: %s\n", result->file_name);
411
fprintf_plus(stderr, "File name: %s\n", result->file_name);
229
412
}
230
413
gpgme_recipient_t recipient;
231
414
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
}
415
while(recipient != NULL){
416
fprintf_plus(stderr, "Public key algorithm: %s\n",
417
gpgme_pubkey_algo_name
418
(recipient->pubkey_algo));
419
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
420
fprintf_plus(stderr, "Secret key available: %s\n",
421
recipient->status == GPG_ERR_NO_SECKEY
422
? "No" : "Yes");
423
recipient = recipient->next;
242
424
}
243
425
}
244
426
}
246
428
}
247
429
248
430
if(debug){
249
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
431
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
250
432
}
251
433
252
434
/* 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");
435
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
436
perror_plus("gpgme_data_seek");
255
437
plaintext_length = -1;
256
438
goto decrypt_end;
257
439
}
258
440
259
441
*plaintext = NULL;
260
442
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;
443
plaintext_capacity = incbuffer(plaintext,
444
(size_t)plaintext_length,
445
plaintext_capacity);
446
if(plaintext_capacity == 0){
447
perror_plus("incbuffer");
448
plaintext_length = -1;
449
goto decrypt_end;
268
450
}
269
451
270
452
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
271
453
BUFFER_SIZE);
272
454
/* Print the data, if any */
273
if (ret == 0){
455
if(ret == 0){
274
456
/* EOF */
275
457
break;
276
458
}
277
459
if(ret < 0){
278
perror("gpgme_data_read");
460
perror_plus("gpgme_data_read");
279
461
plaintext_length = -1;
280
462
goto decrypt_end;
281
463
}
283
465
}
284
466
285
467
if(debug){
286
fprintf(stderr, "Decrypted password is: ");
468
fprintf_plus(stderr, "Decrypted password is: ");
287
469
for(ssize_t i = 0; i < plaintext_length; i++){
288
470
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
289
471
}
300
482
return plaintext_length;
301
483
}
302
484
303
static const char * safer_gnutls_strerror (int value) {
304
const char *ret = gnutls_strerror (value); /* Spurious warning */
305
if (ret == NULL)
485
__attribute__((warn_unused_result))
486
static const char *safer_gnutls_strerror(int value){
487
const char *ret = gnutls_strerror(value);
488
if(ret == NULL)
306
489
ret = "(unknown)";
307
490
return ret;
308
491
}
309
492
310
493
/* GnuTLS log function callback */
494
__attribute__((nonnull))
311
495
static void debuggnutls(__attribute__((unused)) int level,
312
496
const char* string){
313
fprintf(stderr, "GnuTLS: %s", string);
497
fprintf_plus(stderr, "GnuTLS: %s", string);
314
498
}
315
499
316
static int init_gnutls_global(mandos_context *mc,
317
const char *pubkeyfilename,
318
const char *seckeyfilename){
500
__attribute__((nonnull, warn_unused_result))
501
static int init_gnutls_global(const char *pubkeyfilename,
502
const char *seckeyfilename,
503
mandos_context *mc){
319
504
int ret;
320
505
321
506
if(debug){
322
fprintf(stderr, "Initializing GnuTLS\n");
507
fprintf_plus(stderr, "Initializing GnuTLS\n");
323
508
}
324
509
325
510
ret = gnutls_global_init();
326
if (ret != GNUTLS_E_SUCCESS) {
327
fprintf (stderr, "GnuTLS global_init: %s\n",
328
safer_gnutls_strerror(ret));
511
if(ret != GNUTLS_E_SUCCESS){
512
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
513
safer_gnutls_strerror(ret));
329
514
return -1;
330
515
}
331
516
332
if (debug){
517
if(debug){
333
518
/* "Use a log level over 10 to enable all debugging options."
334
519
* - GnuTLS manual
335
520
*/
338
523
}
339
524
340
525
/* 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 ();
526
ret = gnutls_certificate_allocate_credentials(&mc->cred);
527
if(ret != GNUTLS_E_SUCCESS){
528
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
529
safer_gnutls_strerror(ret));
530
gnutls_global_deinit();
347
531
return -1;
348
532
}
349
533
350
534
if(debug){
351
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
352
" and keyfile %s as GnuTLS credentials\n", pubkeyfilename,
353
seckeyfilename);
535
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
536
" secret key %s as GnuTLS credentials\n",
537
pubkeyfilename,
538
seckeyfilename);
354
539
}
355
540
356
541
ret = gnutls_certificate_set_openpgp_key_file
357
542
(mc->cred, pubkeyfilename, seckeyfilename,
358
543
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));
544
if(ret != GNUTLS_E_SUCCESS){
545
fprintf_plus(stderr,
546
"Error[%d] while reading the OpenPGP key pair ('%s',"
547
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
548
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
549
safer_gnutls_strerror(ret));
365
550
goto globalfail;
366
551
}
367
552
368
553
/* GnuTLS server initialization */
369
554
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));
555
if(ret != GNUTLS_E_SUCCESS){
556
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
557
" initialization: %s\n",
558
safer_gnutls_strerror(ret));
373
559
goto globalfail;
374
560
}
375
561
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));
562
if(ret != GNUTLS_E_SUCCESS){
563
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
564
safer_gnutls_strerror(ret));
379
565
goto globalfail;
380
566
}
381
567
387
573
388
574
gnutls_certificate_free_credentials(mc->cred);
389
575
gnutls_global_deinit();
576
gnutls_dh_params_deinit(mc->dh_params);
390
577
return -1;
391
578
}
392
579
393
static int init_gnutls_session(mandos_context *mc,
394
gnutls_session_t *session){
580
__attribute__((nonnull, warn_unused_result))
581
static int init_gnutls_session(gnutls_session_t *session,
582
mandos_context *mc){
395
583
int ret;
396
584
/* GnuTLS session creation */
397
ret = gnutls_init(session, GNUTLS_SERVER);
398
if (ret != GNUTLS_E_SUCCESS){
399
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
400
safer_gnutls_strerror(ret));
585
do {
586
ret = gnutls_init(session, GNUTLS_SERVER);
587
if(quit_now){
588
return -1;
589
}
590
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
591
if(ret != GNUTLS_E_SUCCESS){
592
fprintf_plus(stderr,
593
"Error in GnuTLS session initialization: %s\n",
594
safer_gnutls_strerror(ret));
401
595
}
402
596
403
597
{
404
598
const char *err;
405
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
406
if (ret != GNUTLS_E_SUCCESS) {
407
fprintf(stderr, "Syntax error at: %s\n", err);
408
fprintf(stderr, "GnuTLS error: %s\n",
409
safer_gnutls_strerror(ret));
410
gnutls_deinit (*session);
599
do {
600
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
601
if(quit_now){
602
gnutls_deinit(*session);
603
return -1;
604
}
605
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
606
if(ret != GNUTLS_E_SUCCESS){
607
fprintf_plus(stderr, "Syntax error at: %s\n", err);
608
fprintf_plus(stderr, "GnuTLS error: %s\n",
609
safer_gnutls_strerror(ret));
610
gnutls_deinit(*session);
411
611
return -1;
412
612
}
413
613
}
414
614
415
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
416
mc->cred);
417
if (ret != GNUTLS_E_SUCCESS) {
418
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
419
safer_gnutls_strerror(ret));
420
gnutls_deinit (*session);
615
do {
616
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
617
mc->cred);
618
if(quit_now){
619
gnutls_deinit(*session);
620
return -1;
621
}
622
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
623
if(ret != GNUTLS_E_SUCCESS){
624
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
625
safer_gnutls_strerror(ret));
626
gnutls_deinit(*session);
421
627
return -1;
422
628
}
423
629
424
630
/* ignore client certificate if any. */
425
gnutls_certificate_server_set_request (*session,
426
GNUTLS_CERT_IGNORE);
631
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
427
632
428
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
633
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
429
634
430
635
return 0;
431
636
}
435
640
__attribute__((unused)) const char *txt){}
436
641
437
642
/* Called when a Mandos server is found */
438
static int start_mandos_communication(const char *ip, uint16_t port,
643
__attribute__((nonnull, warn_unused_result))
644
static int start_mandos_communication(const char *ip, in_port_t port,
439
645
AvahiIfIndex if_index,
440
mandos_context *mc){
441
int ret, tcp_sd;
442
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
646
int af, mandos_context *mc){
647
int ret, tcp_sd = -1;
648
ssize_t sret;
649
struct sockaddr_storage to;
443
650
char *buffer = NULL;
444
char *decrypted_buffer;
651
char *decrypted_buffer = NULL;
445
652
size_t buffer_length = 0;
446
653
size_t buffer_capacity = 0;
447
ssize_t decrypted_buffer_size;
448
654
size_t written;
449
int retval = 0;
450
char interface[IF_NAMESIZE];
655
int retval = -1;
451
656
gnutls_session_t session;
452
453
ret = init_gnutls_session (mc, &session);
454
if (ret != 0){
455
return -1;
456
}
457
458
if(debug){
459
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
460
"\n", ip, port);
461
}
462
463
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
464
if(tcp_sd < 0) {
465
perror("socket");
466
return -1;
467
}
468
469
if(debug){
470
if(if_indextoname((unsigned int)if_index, interface) == NULL){
471
perror("if_indextoname");
657
int pf; /* Protocol family */
658
659
errno = 0;
660
661
if(quit_now){
662
errno = EINTR;
663
return -1;
664
}
665
666
switch(af){
667
case AF_INET6:
668
pf = PF_INET6;
669
break;
670
case AF_INET:
671
pf = PF_INET;
672
break;
673
default:
674
fprintf_plus(stderr, "Bad address family: %d\n", af);
675
errno = EINVAL;
676
return -1;
677
}
678
679
/* If the interface is specified and we have a list of interfaces */
680
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
681
/* Check if the interface is one of the interfaces we are using */
682
bool match = false;
683
{
684
char *interface = NULL;
685
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
686
interface))){
687
if(if_nametoindex(interface) == (unsigned int)if_index){
688
match = true;
689
break;
690
}
691
}
692
}
693
if(not match){
694
/* This interface does not match any in the list, so we don't
695
connect to the server */
696
if(debug){
697
char interface[IF_NAMESIZE];
698
if(if_indextoname((unsigned int)if_index, interface) == NULL){
699
perror_plus("if_indextoname");
700
} else {
701
fprintf_plus(stderr, "Skipping server on non-used interface"
702
" \"%s\"\n",
703
if_indextoname((unsigned int)if_index,
704
interface));
705
}
706
}
472
707
return -1;
473
708
}
474
fprintf(stderr, "Binding to interface %s\n", interface);
709
}
710
711
ret = init_gnutls_session(&session, mc);
712
if(ret != 0){
713
return -1;
714
}
715
716
if(debug){
717
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
718
PRIuMAX "\n", ip, (uintmax_t)port);
719
}
720
721
tcp_sd = socket(pf, SOCK_STREAM, 0);
722
if(tcp_sd < 0){
723
int e = errno;
724
perror_plus("socket");
725
errno = e;
726
goto mandos_end;
727
}
728
729
if(quit_now){
730
errno = EINTR;
731
goto mandos_end;
475
732
}
476
733
477
734
memset(&to, 0, sizeof(to));
478
to.in6.sin6_family = AF_INET6;
479
/* It would be nice to have a way to detect if we were passed an
480
IPv4 address here. Now we assume an IPv6 address. */
481
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
482
if (ret < 0 ){
483
perror("inet_pton");
484
return -1;
735
if(af == AF_INET6){
736
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
737
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
738
} else { /* IPv4 */
739
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
740
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
741
}
742
if(ret < 0 ){
743
int e = errno;
744
perror_plus("inet_pton");
745
errno = e;
746
goto mandos_end;
485
747
}
486
748
if(ret == 0){
487
fprintf(stderr, "Bad address: %s\n", ip);
488
return -1;
489
}
490
to.in6.sin6_port = htons(port); /* Spurious warning */
749
int e = errno;
750
fprintf_plus(stderr, "Bad address: %s\n", ip);
751
errno = e;
752
goto mandos_end;
753
}
754
if(af == AF_INET6){
755
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
756
if(IN6_IS_ADDR_LINKLOCAL
757
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
758
if(if_index == AVAHI_IF_UNSPEC){
759
fprintf_plus(stderr, "An IPv6 link-local address is"
760
" incomplete without a network interface\n");
761
errno = EINVAL;
762
goto mandos_end;
763
}
764
/* Set the network interface number as scope */
765
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
766
}
767
} else {
768
((struct sockaddr_in *)&to)->sin_port = htons(port);
769
}
491
770
492
to.in6.sin6_scope_id = (uint32_t)if_index;
771
if(quit_now){
772
errno = EINTR;
773
goto mandos_end;
774
}
493
775
494
776
if(debug){
495
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
496
port);
497
char addrstr[INET6_ADDRSTRLEN] = "";
498
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
499
sizeof(addrstr)) == NULL){
500
perror("inet_ntop");
501
} else {
502
if(strcmp(addrstr, ip) != 0){
503
fprintf(stderr, "Canonical address form: %s\n", addrstr);
777
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
778
char interface[IF_NAMESIZE];
779
if(if_indextoname((unsigned int)if_index, interface) == NULL){
780
perror_plus("if_indextoname");
781
} else {
782
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
783
"\n", ip, interface, (uintmax_t)port);
504
784
}
505
}
506
}
507
508
ret = connect(tcp_sd, &to.in, sizeof(to));
509
if (ret < 0){
510
perror("connect");
511
return -1;
785
} else {
786
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
787
ip, (uintmax_t)port);
788
}
789
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
790
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
791
if(af == AF_INET6){
792
ret = getnameinfo((struct sockaddr *)&to,
793
sizeof(struct sockaddr_in6),
794
addrstr, sizeof(addrstr), NULL, 0,
795
NI_NUMERICHOST);
796
} else {
797
ret = getnameinfo((struct sockaddr *)&to,
798
sizeof(struct sockaddr_in),
799
addrstr, sizeof(addrstr), NULL, 0,
800
NI_NUMERICHOST);
801
}
802
if(ret == EAI_SYSTEM){
803
perror_plus("getnameinfo");
804
} else if(ret != 0) {
805
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
806
} else if(strcmp(addrstr, ip) != 0){
807
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
808
}
809
}
810
811
if(quit_now){
812
errno = EINTR;
813
goto mandos_end;
814
}
815
816
if(af == AF_INET6){
817
ret = connect(tcp_sd, (struct sockaddr *)&to,
818
sizeof(struct sockaddr_in6));
819
} else {
820
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
821
sizeof(struct sockaddr_in));
822
}
823
if(ret < 0){
824
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
825
int e = errno;
826
perror_plus("connect");
827
errno = e;
828
}
829
goto mandos_end;
830
}
831
832
if(quit_now){
833
errno = EINTR;
834
goto mandos_end;
512
835
}
513
836
514
837
const char *out = mandos_protocol_version;
515
838
written = 0;
516
while (true){
839
while(true){
517
840
size_t out_size = strlen(out);
518
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
519
out_size - written));
520
if (ret == -1){
521
perror("write");
522
retval = -1;
841
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
842
out_size - written));
843
if(ret == -1){
844
int e = errno;
845
perror_plus("write");
846
errno = e;
523
847
goto mandos_end;
524
848
}
525
849
written += (size_t)ret;
526
850
if(written < out_size){
527
851
continue;
528
852
} else {
529
if (out == mandos_protocol_version){
853
if(out == mandos_protocol_version){
530
854
written = 0;
531
855
out = "\r\n";
532
856
} else {
533
857
break;
534
858
}
535
859
}
860
861
if(quit_now){
862
errno = EINTR;
863
goto mandos_end;
864
}
536
865
}
537
866
538
867
if(debug){
539
fprintf(stderr, "Establishing TLS session with %s\n", ip);
540
}
541
542
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
543
544
do{
545
ret = gnutls_handshake (session);
868
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
869
}
870
871
if(quit_now){
872
errno = EINTR;
873
goto mandos_end;
874
}
875
876
/* This casting via intptr_t is to eliminate warning about casting
877
an int to a pointer type. This is exactly how the GnuTLS Guile
878
function "set-session-transport-fd!" does it. */
879
gnutls_transport_set_ptr(session,
880
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
881
882
if(quit_now){
883
errno = EINTR;
884
goto mandos_end;
885
}
886
887
do {
888
ret = gnutls_handshake(session);
889
if(quit_now){
890
errno = EINTR;
891
goto mandos_end;
892
}
546
893
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
547
894
548
if (ret != GNUTLS_E_SUCCESS){
895
if(ret != GNUTLS_E_SUCCESS){
549
896
if(debug){
550
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
551
gnutls_perror (ret);
897
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
898
gnutls_perror(ret);
552
899
}
553
retval = -1;
900
errno = EPROTO;
554
901
goto mandos_end;
555
902
}
556
903
557
904
/* Read OpenPGP packet that contains the wanted password */
558
905
559
906
if(debug){
560
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
561
ip);
907
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
908
" %s\n", ip);
562
909
}
563
910
564
911
while(true){
565
buffer_capacity = adjustbuffer(&buffer, buffer_length,
566
buffer_capacity);
567
if (buffer_capacity == 0){
568
perror("adjustbuffer");
569
retval = -1;
570
goto mandos_end;
571
}
572
573
ret = gnutls_record_recv(session, buffer+buffer_length,
574
BUFFER_SIZE);
575
if (ret == 0){
912
913
if(quit_now){
914
errno = EINTR;
915
goto mandos_end;
916
}
917
918
buffer_capacity = incbuffer(&buffer, buffer_length,
919
buffer_capacity);
920
if(buffer_capacity == 0){
921
int e = errno;
922
perror_plus("incbuffer");
923
errno = e;
924
goto mandos_end;
925
}
926
927
if(quit_now){
928
errno = EINTR;
929
goto mandos_end;
930
}
931
932
sret = gnutls_record_recv(session, buffer+buffer_length,
933
BUFFER_SIZE);
934
if(sret == 0){
576
935
break;
577
936
}
578
if (ret < 0){
579
switch(ret){
937
if(sret < 0){
938
switch(sret){
580
939
case GNUTLS_E_INTERRUPTED:
581
940
case GNUTLS_E_AGAIN:
582
941
break;
583
942
case GNUTLS_E_REHANDSHAKE:
584
do{
585
ret = gnutls_handshake (session);
943
do {
944
ret = gnutls_handshake(session);
945
946
if(quit_now){
947
errno = EINTR;
948
goto mandos_end;
949
}
586
950
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
587
if (ret < 0){
588
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
589
gnutls_perror (ret);
590
retval = -1;
951
if(ret < 0){
952
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
953
"***\n");
954
gnutls_perror(ret);
955
errno = EPROTO;
591
956
goto mandos_end;
592
957
}
593
958
break;
594
959
default:
595
fprintf(stderr, "Unknown error while reading data from"
596
" encrypted session with Mandos server\n");
597
retval = -1;
598
gnutls_bye (session, GNUTLS_SHUT_RDWR);
960
fprintf_plus(stderr, "Unknown error while reading data from"
961
" encrypted session with Mandos server\n");
962
gnutls_bye(session, GNUTLS_SHUT_RDWR);
963
errno = EIO;
599
964
goto mandos_end;
600
965
}
601
966
} else {
602
buffer_length += (size_t) ret;
967
buffer_length += (size_t) sret;
603
968
}
604
969
}
605
970
606
971
if(debug){
607
fprintf(stderr, "Closing TLS session\n");
608
}
609
610
gnutls_bye (session, GNUTLS_SHUT_RDWR);
611
612
if (buffer_length > 0){
613
decrypted_buffer_size = pgp_packet_decrypt(buffer,
614
buffer_length,
615
&decrypted_buffer,
616
keydir);
617
if (decrypted_buffer_size >= 0){
972
fprintf_plus(stderr, "Closing TLS session\n");
973
}
974
975
if(quit_now){
976
errno = EINTR;
977
goto mandos_end;
978
}
979
980
do {
981
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
982
if(quit_now){
983
errno = EINTR;
984
goto mandos_end;
985
}
986
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
987
988
if(buffer_length > 0){
989
ssize_t decrypted_buffer_size;
990
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
991
&decrypted_buffer, mc);
992
if(decrypted_buffer_size >= 0){
993
618
994
written = 0;
619
995
while(written < (size_t) decrypted_buffer_size){
620
ret = (int)fwrite (decrypted_buffer + written, 1,
621
(size_t)decrypted_buffer_size - written,
622
stdout);
996
if(quit_now){
997
errno = EINTR;
998
goto mandos_end;
999
}
1000
1001
ret = (int)fwrite(decrypted_buffer + written, 1,
1002
(size_t)decrypted_buffer_size - written,
1003
stdout);
623
1004
if(ret == 0 and ferror(stdout)){
1005
int e = errno;
624
1006
if(debug){
625
fprintf(stderr, "Error writing encrypted data: %s\n",
626
strerror(errno));
1007
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1008
strerror(errno));
627
1009
}
628
retval = -1;
629
break;
1010
errno = e;
1011
goto mandos_end;
630
1012
}
631
1013
written += (size_t)ret;
632
1014
}
633
free(decrypted_buffer);
634
} else {
635
retval = -1;
1015
retval = 0;
636
1016
}
637
} else {
638
retval = -1;
639
1017
}
640
1018
641
1019
/* Shutdown procedure */
642
1020
643
1021
mandos_end:
644
free(buffer);
645
close(tcp_sd);
646
gnutls_deinit (session);
1022
{
1023
int e = errno;
1024
free(decrypted_buffer);
1025
free(buffer);
1026
if(tcp_sd >= 0){
1027
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1028
}
1029
if(ret == -1){
1030
if(e == 0){
1031
e = errno;
1032
}
1033
perror_plus("close");
1034
}
1035
gnutls_deinit(session);
1036
errno = e;
1037
if(quit_now){
1038
errno = EINTR;
1039
retval = -1;
1040
}
1041
}
647
1042
return retval;
648
1043
}
649
1044
1045
__attribute__((nonnull))
650
1046
static void resolve_callback(AvahiSServiceResolver *r,
651
1047
AvahiIfIndex interface,
652
AVAHI_GCC_UNUSED AvahiProtocol protocol,
1048
AvahiProtocol proto,
653
1049
AvahiResolverEvent event,
654
1050
const char *name,
655
1051
const char *type,
660
1056
AVAHI_GCC_UNUSED AvahiStringList *txt,
661
1057
AVAHI_GCC_UNUSED AvahiLookupResultFlags
662
1058
flags,
663
void* userdata) {
664
mandos_context *mc = userdata;
665
assert(r);
1059
void *mc){
1060
if(r == NULL){
1061
return;
1062
}
666
1063
667
1064
/* Called whenever a service has been resolved successfully or
668
1065
timed out */
669
1066
670
switch (event) {
1067
if(quit_now){
1068
return;
1069
}
1070
1071
switch(event){
671
1072
default:
672
1073
case AVAHI_RESOLVER_FAILURE:
673
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
674
" of type '%s' in domain '%s': %s\n", name, type, domain,
675
avahi_strerror(avahi_server_errno(mc->server)));
1074
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1075
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1076
domain,
1077
avahi_strerror(avahi_server_errno
1078
(((mandos_context*)mc)->server)));
676
1079
break;
677
1080
678
1081
case AVAHI_RESOLVER_FOUND:
680
1083
char ip[AVAHI_ADDRESS_STR_MAX];
681
1084
avahi_address_snprint(ip, sizeof(ip), address);
682
1085
if(debug){
683
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
684
PRIu16 ") on port %d\n", name, host_name, ip,
685
interface, port);
1086
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1087
PRIdMAX ") on port %" PRIu16 "\n", name,
1088
host_name, ip, (intmax_t)interface, port);
686
1089
}
687
int ret = start_mandos_communication(ip, port, interface, mc);
688
if (ret == 0){
689
avahi_simple_poll_quit(mc->simple_poll);
1090
int ret = start_mandos_communication(ip, (in_port_t)port,
1091
interface,
1092
avahi_proto_to_af(proto),
1093
mc);
1094
if(ret == 0){
1095
avahi_simple_poll_quit(simple_poll);
1096
} else {
1097
if(not add_server(ip, (in_port_t)port, interface,
1098
avahi_proto_to_af(proto),
1099
&((mandos_context*)mc)->current_server)){
1100
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1101
" list\n", name);
1102
}
690
1103
}
691
1104
}
692
1105
}
693
1106
avahi_s_service_resolver_free(r);
694
1107
}
695
1108
696
static void browse_callback( AvahiSServiceBrowser *b,
697
AvahiIfIndex interface,
698
AvahiProtocol protocol,
699
AvahiBrowserEvent event,
700
const char *name,
701
const char *type,
702
const char *domain,
703
AVAHI_GCC_UNUSED AvahiLookupResultFlags
704
flags,
705
void* userdata) {
706
mandos_context *mc = userdata;
707
assert(b);
1109
static void browse_callback(AvahiSServiceBrowser *b,
1110
AvahiIfIndex interface,
1111
AvahiProtocol protocol,
1112
AvahiBrowserEvent event,
1113
const char *name,
1114
const char *type,
1115
const char *domain,
1116
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1117
flags,
1118
void *mc){
1119
if(b == NULL){
1120
return;
1121
}
708
1122
709
1123
/* Called whenever a new services becomes available on the LAN or
710
1124
is removed from the LAN */
711
1125
712
switch (event) {
1126
if(quit_now){
1127
return;
1128
}
1129
1130
switch(event){
713
1131
default:
714
1132
case AVAHI_BROWSER_FAILURE:
715
1133
716
fprintf(stderr, "(Avahi browser) %s\n",
717
avahi_strerror(avahi_server_errno(mc->server)));
718
avahi_simple_poll_quit(mc->simple_poll);
1134
fprintf_plus(stderr, "(Avahi browser) %s\n",
1135
avahi_strerror(avahi_server_errno
1136
(((mandos_context*)mc)->server)));
1137
avahi_simple_poll_quit(simple_poll);
719
1138
return;
720
1139
721
1140
case AVAHI_BROWSER_NEW:
724
1143
the callback function is called the Avahi server will free the
725
1144
resolver for us. */
726
1145
727
if (!(avahi_s_service_resolver_new(mc->server, interface,
728
protocol, name, type, domain,
729
AVAHI_PROTO_INET6, 0,
730
resolve_callback, mc)))
731
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
732
name, avahi_strerror(avahi_server_errno(mc->server)));
1146
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1147
interface, protocol, name, type,
1148
domain, protocol, 0,
1149
resolve_callback, mc) == NULL)
1150
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1151
" %s\n", name,
1152
avahi_strerror(avahi_server_errno
1153
(((mandos_context*)mc)->server)));
733
1154
break;
734
1155
735
1156
case AVAHI_BROWSER_REMOVE:
738
1159
case AVAHI_BROWSER_ALL_FOR_NOW:
739
1160
case AVAHI_BROWSER_CACHE_EXHAUSTED:
740
1161
if(debug){
741
fprintf(stderr, "No Mandos server found, still searching...\n");
1162
fprintf_plus(stderr, "No Mandos server found, still"
1163
" searching...\n");
742
1164
}
743
1165
break;
744
1166
}
745
1167
}
746
1168
747
/* Combines file name and path and returns the malloced new
748
string. some sane checks could/should be added */
749
static char *combinepath(const char *first, const char *second){
1169
/* Signal handler that stops main loop after SIGTERM */
1170
static void handle_sigterm(int sig){
1171
if(quit_now){
1172
return;
1173
}
1174
quit_now = 1;
1175
signal_received = sig;
1176
int old_errno = errno;
1177
/* set main loop to exit */
1178
if(simple_poll != NULL){
1179
avahi_simple_poll_quit(simple_poll);
1180
}
1181
errno = old_errno;
1182
}
1183
1184
__attribute__((nonnull, warn_unused_result))
1185
bool get_flags(const char *ifname, struct ifreq *ifr){
1186
int ret;
1187
error_t ret_errno;
1188
1189
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1190
if(s < 0){
1191
ret_errno = errno;
1192
perror_plus("socket");
1193
errno = ret_errno;
1194
return false;
1195
}
1196
strcpy(ifr->ifr_name, ifname);
1197
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1198
if(ret == -1){
1199
if(debug){
1200
ret_errno = errno;
1201
perror_plus("ioctl SIOCGIFFLAGS");
1202
errno = ret_errno;
1203
}
1204
return false;
1205
}
1206
return true;
1207
}
1208
1209
__attribute__((nonnull, warn_unused_result))
1210
bool good_flags(const char *ifname, const struct ifreq *ifr){
1211
1212
/* Reject the loopback device */
1213
if(ifr->ifr_flags & IFF_LOOPBACK){
1214
if(debug){
1215
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1216
ifname);
1217
}
1218
return false;
1219
}
1220
/* Accept point-to-point devices only if connect_to is specified */
1221
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1222
if(debug){
1223
fprintf_plus(stderr, "Accepting point-to-point interface"
1224
" \"%s\"\n", ifname);
1225
}
1226
return true;
1227
}
1228
/* Otherwise, reject non-broadcast-capable devices */
1229
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1230
if(debug){
1231
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1232
" \"%s\"\n", ifname);
1233
}
1234
return false;
1235
}
1236
/* Reject non-ARP interfaces (including dummy interfaces) */
1237
if(ifr->ifr_flags & IFF_NOARP){
1238
if(debug){
1239
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1240
ifname);
1241
}
1242
return false;
1243
}
1244
1245
/* Accept this device */
1246
if(debug){
1247
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1248
}
1249
return true;
1250
}
1251
1252
/*
1253
* This function determines if a directory entry in /sys/class/net
1254
* corresponds to an acceptable network device.
1255
* (This function is passed to scandir(3) as a filter function.)
1256
*/
1257
__attribute__((nonnull, warn_unused_result))
1258
int good_interface(const struct dirent *if_entry){
1259
if(if_entry->d_name[0] == '.'){
1260
return 0;
1261
}
1262
1263
struct ifreq ifr;
1264
if(not get_flags(if_entry->d_name, &ifr)){
1265
if(debug){
1266
fprintf_plus(stderr, "Failed to get flags for interface "
1267
"\"%s\"\n", if_entry->d_name);
1268
}
1269
return 0;
1270
}
1271
1272
if(not good_flags(if_entry->d_name, &ifr)){
1273
return 0;
1274
}
1275
return 1;
1276
}
1277
1278
/*
1279
* This function determines if a network interface is up.
1280
*/
1281
__attribute__((nonnull, warn_unused_result))
1282
bool interface_is_up(const char *interface){
1283
struct ifreq ifr;
1284
if(not get_flags(interface, &ifr)){
1285
if(debug){
1286
fprintf_plus(stderr, "Failed to get flags for interface "
1287
"\"%s\"\n", interface);
1288
}
1289
return false;
1290
}
1291
1292
return (bool)(ifr.ifr_flags & IFF_UP);
1293
}
1294
1295
/*
1296
* This function determines if a network interface is running
1297
*/
1298
__attribute__((nonnull, warn_unused_result))
1299
bool interface_is_running(const char *interface){
1300
struct ifreq ifr;
1301
if(not get_flags(interface, &ifr)){
1302
if(debug){
1303
fprintf_plus(stderr, "Failed to get flags for interface "
1304
"\"%s\"\n", interface);
1305
}
1306
return false;
1307
}
1308
1309
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1310
}
1311
1312
__attribute__((nonnull, pure, warn_unused_result))
1313
int notdotentries(const struct dirent *direntry){
1314
/* Skip "." and ".." */
1315
if(direntry->d_name[0] == '.'
1316
and (direntry->d_name[1] == '\0'
1317
or (direntry->d_name[1] == '.'
1318
and direntry->d_name[2] == '\0'))){
1319
return 0;
1320
}
1321
return 1;
1322
}
1323
1324
/* Is this directory entry a runnable program? */
1325
__attribute__((nonnull, warn_unused_result))
1326
int runnable_hook(const struct dirent *direntry){
1327
int ret;
1328
size_t sret;
1329
struct stat st;
1330
1331
if((direntry->d_name)[0] == '\0'){
1332
/* Empty name? */
1333
return 0;
1334
}
1335
1336
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1337
"abcdefghijklmnopqrstuvwxyz"
1338
"0123456789"
1339
"_.-");
1340
if((direntry->d_name)[sret] != '\0'){
1341
/* Contains non-allowed characters */
1342
if(debug){
1343
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1344
direntry->d_name);
1345
}
1346
return 0;
1347
}
1348
1349
char *fullname = NULL;
1350
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1351
if(ret < 0){
1352
perror_plus("asprintf");
1353
return 0;
1354
}
1355
1356
ret = stat(fullname, &st);
1357
if(ret == -1){
1358
if(debug){
1359
perror_plus("Could not stat hook");
1360
}
1361
return 0;
1362
}
1363
free(fullname);
1364
if(not (S_ISREG(st.st_mode))){
1365
/* Not a regular file */
1366
if(debug){
1367
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1368
direntry->d_name);
1369
}
1370
return 0;
1371
}
1372
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1373
/* Not executable */
1374
if(debug){
1375
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1376
direntry->d_name);
1377
}
1378
return 0;
1379
}
1380
if(debug){
1381
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1382
direntry->d_name);
1383
}
1384
return 1;
1385
}
1386
1387
__attribute__((nonnull, warn_unused_result))
1388
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1389
mandos_context *mc){
1390
int ret;
1391
struct timespec now;
1392
struct timespec waited_time;
1393
intmax_t block_time;
1394
1395
while(true){
1396
if(mc->current_server == NULL){
1397
if(debug){
1398
fprintf_plus(stderr, "Wait until first server is found."
1399
" No timeout!\n");
1400
}
1401
ret = avahi_simple_poll_iterate(s, -1);
1402
} else {
1403
if(debug){
1404
fprintf_plus(stderr, "Check current_server if we should run"
1405
" it, or wait\n");
1406
}
1407
/* the current time */
1408
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1409
if(ret == -1){
1410
perror_plus("clock_gettime");
1411
return -1;
1412
}
1413
/* Calculating in ms how long time between now and server
1414
who we visted longest time ago. Now - last seen. */
1415
waited_time.tv_sec = (now.tv_sec
1416
- mc->current_server->last_seen.tv_sec);
1417
waited_time.tv_nsec = (now.tv_nsec
1418
- mc->current_server->last_seen.tv_nsec);
1419
/* total time is 10s/10,000ms.
1420
Converting to s from ms by dividing by 1,000,
1421
and ns to ms by dividing by 1,000,000. */
1422
block_time = ((retry_interval
1423
- ((intmax_t)waited_time.tv_sec * 1000))
1424
- ((intmax_t)waited_time.tv_nsec / 1000000));
1425
1426
if(debug){
1427
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1428
block_time);
1429
}
1430
1431
if(block_time <= 0){
1432
ret = start_mandos_communication(mc->current_server->ip,
1433
mc->current_server->port,
1434
mc->current_server->if_index,
1435
mc->current_server->af, mc);
1436
if(ret == 0){
1437
avahi_simple_poll_quit(s);
1438
return 0;
1439
}
1440
ret = clock_gettime(CLOCK_MONOTONIC,
1441
&mc->current_server->last_seen);
1442
if(ret == -1){
1443
perror_plus("clock_gettime");
1444
return -1;
1445
}
1446
mc->current_server = mc->current_server->next;
1447
block_time = 0; /* Call avahi to find new Mandos
1448
servers, but don't block */
1449
}
1450
1451
ret = avahi_simple_poll_iterate(s, (int)block_time);
1452
}
1453
if(ret != 0){
1454
if(ret > 0 or errno != EINTR){
1455
return (ret != 1) ? ret : 0;
1456
}
1457
}
1458
}
1459
}
1460
1461
/* Set effective uid to 0, return errno */
1462
__attribute__((warn_unused_result))
1463
error_t raise_privileges(void){
1464
error_t old_errno = errno;
1465
error_t ret_errno = 0;
1466
if(seteuid(0) == -1){
1467
ret_errno = errno;
1468
perror_plus("seteuid");
1469
}
1470
errno = old_errno;
1471
return ret_errno;
1472
}
1473
1474
/* Set effective and real user ID to 0. Return errno. */
1475
__attribute__((warn_unused_result))
1476
error_t raise_privileges_permanently(void){
1477
error_t old_errno = errno;
1478
error_t ret_errno = raise_privileges();
1479
if(ret_errno != 0){
1480
errno = old_errno;
1481
return ret_errno;
1482
}
1483
if(setuid(0) == -1){
1484
ret_errno = errno;
1485
perror_plus("seteuid");
1486
}
1487
errno = old_errno;
1488
return ret_errno;
1489
}
1490
1491
/* Set effective user ID to unprivileged saved user ID */
1492
__attribute__((warn_unused_result))
1493
error_t lower_privileges(void){
1494
error_t old_errno = errno;
1495
error_t ret_errno = 0;
1496
if(seteuid(uid) == -1){
1497
ret_errno = errno;
1498
perror_plus("seteuid");
1499
}
1500
errno = old_errno;
1501
return ret_errno;
1502
}
1503
1504
/* Lower privileges permanently */
1505
__attribute__((warn_unused_result))
1506
error_t lower_privileges_permanently(void){
1507
error_t old_errno = errno;
1508
error_t ret_errno = 0;
1509
if(setuid(uid) == -1){
1510
ret_errno = errno;
1511
perror_plus("setuid");
1512
}
1513
errno = old_errno;
1514
return ret_errno;
1515
}
1516
1517
#ifndef O_CLOEXEC
1518
/*
1519
* Based on the example in the GNU LibC manual chapter 13.13 "File
1520
* Descriptor Flags".
1521
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
1522
*/
1523
__attribute__((warn_unused_result))
1524
static int set_cloexec_flag(int fd){
1525
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
1526
/* If reading the flags failed, return error indication now. */
1527
if(ret < 0){
1528
return ret;
1529
}
1530
/* Store modified flag word in the descriptor. */
1531
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
1532
ret | FD_CLOEXEC));
1533
}
1534
#endif /* not O_CLOEXEC */
1535
1536
__attribute__((nonnull))
1537
void run_network_hooks(const char *mode, const char *interface,
1538
const float delay){
1539
struct dirent **direntries;
1540
if(hookdir_fd == -1){
1541
hookdir_fd = open(hookdir, O_RDONLY |
1542
#ifdef O_CLOEXEC
1543
O_CLOEXEC
1544
#else /* not O_CLOEXEC */
1545
0
1546
#endif /* not O_CLOEXEC */
1547
);
1548
if(hookdir_fd == -1){
1549
if(errno == ENOENT){
1550
if(debug){
1551
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1552
" found\n", hookdir);
1553
}
1554
} else {
1555
perror_plus("open");
1556
}
1557
return;
1558
}
1559
#ifndef O_CLOEXEC
1560
if(set_cloexec_flag(hookdir_fd) < 0){
1561
perror_plus("set_cloexec_flag");
1562
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1563
perror_plus("close");
1564
} else {
1565
hookdir_fd = -1;
1566
}
1567
return;
1568
}
1569
#endif /* not O_CLOEXEC */
1570
}
1571
#ifdef __GLIBC__
1572
#if __GLIBC_PREREQ(2, 15)
1573
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1574
runnable_hook, alphasort);
1575
#else /* not __GLIBC_PREREQ(2, 15) */
1576
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1577
alphasort);
1578
#endif /* not __GLIBC_PREREQ(2, 15) */
1579
#else /* not __GLIBC__ */
1580
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1581
alphasort);
1582
#endif /* not __GLIBC__ */
1583
if(numhooks == -1){
1584
perror_plus("scandir");
1585
return;
1586
}
1587
struct dirent *direntry;
1588
int ret;
1589
int devnull = open("/dev/null", O_RDONLY);
1590
for(int i = 0; i < numhooks; i++){
1591
direntry = direntries[i];
1592
if(debug){
1593
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1594
direntry->d_name);
1595
}
1596
pid_t hook_pid = fork();
1597
if(hook_pid == 0){
1598
/* Child */
1599
/* Raise privileges */
1600
if(raise_privileges_permanently() != 0){
1601
perror_plus("Failed to raise privileges");
1602
_exit(EX_NOPERM);
1603
}
1604
/* Set group */
1605
errno = 0;
1606
ret = setgid(0);
1607
if(ret == -1){
1608
perror_plus("setgid");
1609
_exit(EX_NOPERM);
1610
}
1611
/* Reset supplementary groups */
1612
errno = 0;
1613
ret = setgroups(0, NULL);
1614
if(ret == -1){
1615
perror_plus("setgroups");
1616
_exit(EX_NOPERM);
1617
}
1618
ret = dup2(devnull, STDIN_FILENO);
1619
if(ret == -1){
1620
perror_plus("dup2(devnull, STDIN_FILENO)");
1621
_exit(EX_OSERR);
1622
}
1623
ret = close(devnull);
1624
if(ret == -1){
1625
perror_plus("close");
1626
_exit(EX_OSERR);
1627
}
1628
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1629
if(ret == -1){
1630
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1631
_exit(EX_OSERR);
1632
}
1633
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1634
if(ret == -1){
1635
perror_plus("setenv");
1636
_exit(EX_OSERR);
1637
}
1638
ret = setenv("DEVICE", interface, 1);
1639
if(ret == -1){
1640
perror_plus("setenv");
1641
_exit(EX_OSERR);
1642
}
1643
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1644
if(ret == -1){
1645
perror_plus("setenv");
1646
_exit(EX_OSERR);
1647
}
1648
ret = setenv("MODE", mode, 1);
1649
if(ret == -1){
1650
perror_plus("setenv");
1651
_exit(EX_OSERR);
1652
}
1653
char *delaystring;
1654
ret = asprintf(&delaystring, "%f", (double)delay);
1655
if(ret == -1){
1656
perror_plus("asprintf");
1657
_exit(EX_OSERR);
1658
}
1659
ret = setenv("DELAY", delaystring, 1);
1660
if(ret == -1){
1661
free(delaystring);
1662
perror_plus("setenv");
1663
_exit(EX_OSERR);
1664
}
1665
free(delaystring);
1666
if(connect_to != NULL){
1667
ret = setenv("CONNECT", connect_to, 1);
1668
if(ret == -1){
1669
perror_plus("setenv");
1670
_exit(EX_OSERR);
1671
}
1672
}
1673
if(fexecve(hookdir_fd, (char *const [])
1674
{ direntry->d_name, NULL }, environ) == -1){
1675
perror_plus("fexecve");
1676
_exit(EXIT_FAILURE);
1677
}
1678
} else {
1679
int status;
1680
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1681
perror_plus("waitpid");
1682
continue;
1683
}
1684
if(WIFEXITED(status)){
1685
if(WEXITSTATUS(status) != 0){
1686
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1687
" with status %d\n", direntry->d_name,
1688
WEXITSTATUS(status));
1689
continue;
1690
}
1691
} else if(WIFSIGNALED(status)){
1692
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1693
" signal %d\n", direntry->d_name,
1694
WTERMSIG(status));
1695
continue;
1696
} else {
1697
fprintf_plus(stderr, "Warning: network hook \"%s\""
1698
" crashed\n", direntry->d_name);
1699
continue;
1700
}
1701
}
1702
if(debug){
1703
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1704
direntry->d_name);
1705
}
1706
}
1707
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1708
perror_plus("close");
1709
} else {
1710
hookdir_fd = -1;
1711
}
1712
close(devnull);
1713
}
1714
1715
__attribute__((nonnull, warn_unused_result))
1716
error_t bring_up_interface(const char *const interface,
1717
const float delay){
1718
error_t old_errno = errno;
1719
int ret;
1720
struct ifreq network;
1721
unsigned int if_index = if_nametoindex(interface);
1722
if(if_index == 0){
1723
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1724
errno = old_errno;
1725
return ENXIO;
1726
}
1727
1728
if(quit_now){
1729
errno = old_errno;
1730
return EINTR;
1731
}
1732
1733
if(not interface_is_up(interface)){
1734
error_t ret_errno = 0, ioctl_errno = 0;
1735
if(not get_flags(interface, &network)){
1736
ret_errno = errno;
1737
fprintf_plus(stderr, "Failed to get flags for interface "
1738
"\"%s\"\n", interface);
1739
errno = old_errno;
1740
return ret_errno;
1741
}
1742
network.ifr_flags |= IFF_UP; /* set flag */
1743
1744
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1745
if(sd == -1){
1746
ret_errno = errno;
1747
perror_plus("socket");
1748
errno = old_errno;
1749
return ret_errno;
1750
}
1751
1752
if(quit_now){
1753
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1754
if(ret == -1){
1755
perror_plus("close");
1756
}
1757
errno = old_errno;
1758
return EINTR;
1759
}
1760
1761
if(debug){
1762
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1763
interface);
1764
}
1765
1766
/* Raise privileges */
1767
ret_errno = raise_privileges();
1768
if(ret_errno != 0){
1769
perror_plus("Failed to raise privileges");
1770
}
1771
1772
#ifdef __linux__
1773
int ret_linux;
1774
bool restore_loglevel = false;
1775
if(ret_errno == 0){
1776
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1777
messages about the network interface to mess up the prompt */
1778
ret_linux = klogctl(8, NULL, 5);
1779
if(ret_linux == -1){
1780
perror_plus("klogctl");
1781
} else {
1782
restore_loglevel = true;
1783
}
1784
}
1785
#endif /* __linux__ */
1786
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1787
ioctl_errno = errno;
1788
#ifdef __linux__
1789
if(restore_loglevel){
1790
ret_linux = klogctl(7, NULL, 0);
1791
if(ret_linux == -1){
1792
perror_plus("klogctl");
1793
}
1794
}
1795
#endif /* __linux__ */
1796
1797
/* If raise_privileges() succeeded above */
1798
if(ret_errno == 0){
1799
/* Lower privileges */
1800
ret_errno = lower_privileges();
1801
if(ret_errno != 0){
1802
errno = ret_errno;
1803
perror_plus("Failed to lower privileges");
1804
}
1805
}
1806
1807
/* Close the socket */
1808
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1809
if(ret == -1){
1810
perror_plus("close");
1811
}
1812
1813
if(ret_setflags == -1){
1814
errno = ioctl_errno;
1815
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1816
errno = old_errno;
1817
return ioctl_errno;
1818
}
1819
} else if(debug){
1820
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1821
interface);
1822
}
1823
1824
/* Sleep checking until interface is running.
1825
Check every 0.25s, up to total time of delay */
1826
for(int i=0; i < delay * 4; i++){
1827
if(interface_is_running(interface)){
1828
break;
1829
}
1830
struct timespec sleeptime = { .tv_nsec = 250000000 };
1831
ret = nanosleep(&sleeptime, NULL);
1832
if(ret == -1 and errno != EINTR){
1833
perror_plus("nanosleep");
1834
}
1835
}
1836
1837
errno = old_errno;
1838
return 0;
1839
}
1840
1841
__attribute__((nonnull, warn_unused_result))
1842
error_t take_down_interface(const char *const interface){
1843
error_t old_errno = errno;
1844
struct ifreq network;
1845
unsigned int if_index = if_nametoindex(interface);
1846
if(if_index == 0){
1847
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1848
errno = old_errno;
1849
return ENXIO;
1850
}
1851
if(interface_is_up(interface)){
1852
error_t ret_errno = 0, ioctl_errno = 0;
1853
if(not get_flags(interface, &network) and debug){
1854
ret_errno = errno;
1855
fprintf_plus(stderr, "Failed to get flags for interface "
1856
"\"%s\"\n", interface);
1857
errno = old_errno;
1858
return ret_errno;
1859
}
1860
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1861
1862
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1863
if(sd == -1){
1864
ret_errno = errno;
1865
perror_plus("socket");
1866
errno = old_errno;
1867
return ret_errno;
1868
}
1869
1870
if(debug){
1871
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1872
interface);
1873
}
1874
1875
/* Raise privileges */
1876
ret_errno = raise_privileges();
1877
if(ret_errno != 0){
1878
perror_plus("Failed to raise privileges");
1879
}
1880
1881
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1882
ioctl_errno = errno;
1883
1884
/* If raise_privileges() succeeded above */
1885
if(ret_errno == 0){
1886
/* Lower privileges */
1887
ret_errno = lower_privileges();
1888
if(ret_errno != 0){
1889
errno = ret_errno;
1890
perror_plus("Failed to lower privileges");
1891
}
1892
}
1893
1894
/* Close the socket */
1895
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1896
if(ret == -1){
1897
perror_plus("close");
1898
}
1899
1900
if(ret_setflags == -1){
1901
errno = ioctl_errno;
1902
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1903
errno = old_errno;
1904
return ioctl_errno;
1905
}
1906
} else if(debug){
1907
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1908
interface);
1909
}
1910
1911
errno = old_errno;
1912
return 0;
1913
}
1914
1915
int main(int argc, char *argv[]){
1916
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1917
.priority = "SECURE256:!CTYPE-X.509:"
1918
"+CTYPE-OPENPGP", .current_server = NULL,
1919
.interfaces = NULL, .interfaces_size = 0 };
1920
AvahiSServiceBrowser *sb = NULL;
1921
error_t ret_errno;
1922
int ret;
1923
intmax_t tmpmax;
750
1924
char *tmp;
751
int ret = asprintf(&tmp, "%s/%s", first, second);
752
if(ret < 0){
753
return NULL;
754
}
755
return tmp;
756
}
757
758
759
int main(int argc, char *argv[]){
760
AvahiSServiceBrowser *sb = NULL;
761
int error;
762
int ret;
763
int exitcode = EXIT_SUCCESS;
764
const char *interface = "eth0";
765
struct ifreq network;
766
int sd;
767
uid_t uid;
768
gid_t gid;
769
char *connect_to = NULL;
770
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
771
char *pubkeyfilename = NULL;
772
char *seckeyfilename = NULL;
773
const char *pubkeyname = "pubkey.txt";
774
const char *seckeyname = "seckey.txt";
775
mandos_context mc = { .simple_poll = NULL, .server = NULL,
776
.dh_bits = 1024, .priority = "SECURE256"
777
":!CTYPE-X.509:+CTYPE-OPENPGP" };
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 = "ADDRESS:PORT",
786
.doc = "Connect directly to a specific Mandos server",
787
.group = 1 },
788
{ .name = "interface", .key = 'i',
789
.arg = "NAME",
790
.doc = "Interface that will be used to search for Mandos"
791
" servers",
792
.group = 1 },
793
{ .name = "keydir", .key = 'd',
794
.arg = "DIRECTORY",
795
.doc = "Directory to read the OpenPGP key files from",
796
.group = 1 },
797
{ .name = "seckey", .key = 's',
798
.arg = "FILE",
799
.doc = "OpenPGP secret key file base name",
800
.group = 1 },
801
{ .name = "pubkey", .key = 'p',
802
.arg = "FILE",
803
.doc = "OpenPGP public key file base name",
804
.group = 2 },
805
{ .name = "dh-bits", .key = 129,
806
.arg = "BITS",
807
.doc = "Bit length of the prime number used in the"
808
" Diffie-Hellman key exchange",
809
.group = 2 },
810
{ .name = "priority", .key = 130,
811
.arg = "STRING",
812
.doc = "GnuTLS priority string for the TLS handshake",
813
.group = 1 },
814
{ .name = NULL }
815
};
816
817
error_t parse_opt (int key, char *arg,
818
struct argp_state *state) {
819
/* Get the INPUT argument from `argp_parse', which we know is
820
a pointer to our plugin list pointer. */
821
switch (key) {
822
case 128: /* --debug */
823
debug = true;
824
break;
825
case 'c': /* --connect */
826
connect_to = arg;
827
break;
828
case 'i': /* --interface */
829
interface = arg;
830
break;
831
case 'd': /* --keydir */
832
keydir = arg;
833
break;
834
case 's': /* --seckey */
835
seckeyname = arg;
836
break;
837
case 'p': /* --pubkey */
838
pubkeyname = arg;
839
break;
840
case 129: /* --dh-bits */
841
errno = 0;
842
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
843
if (errno){
844
perror("strtol");
845
exit(EXIT_FAILURE);
846
}
847
break;
848
case 130: /* --priority */
849
mc.priority = arg;
850
break;
851
case ARGP_KEY_ARG:
852
argp_usage (state);
853
case ARGP_KEY_END:
854
break;
855
default:
856
return ARGP_ERR_UNKNOWN;
857
}
858
return 0;
859
}
860
861
struct argp argp = { .options = options, .parser = parse_opt,
862
.args_doc = "",
863
.doc = "Mandos client -- Get and decrypt"
864
" passwords from a Mandos server" };
865
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
866
if (ret == ARGP_ERR_UNKNOWN){
867
fprintf(stderr, "Unknown error while parsing arguments\n");
868
exitcode = EXIT_FAILURE;
869
goto end;
870
}
871
}
872
873
pubkeyfilename = combinepath(keydir, pubkeyname);
874
if (pubkeyfilename == NULL){
875
perror("combinepath");
876
exitcode = EXIT_FAILURE;
877
goto end;
878
}
879
880
seckeyfilename = combinepath(keydir, seckeyname);
881
if (seckeyfilename == NULL){
882
perror("combinepath");
883
exitcode = EXIT_FAILURE;
884
goto end;
885
}
886
887
ret = init_gnutls_global(&mc, pubkeyfilename, seckeyfilename);
888
if (ret == -1){
889
fprintf(stderr, "init_gnutls_global failed\n");
890
exitcode = EXIT_FAILURE;
891
goto end;
892
} else {
893
gnutls_initalized = true;
894
}
895
896
/* If the interface is down, bring it up */
897
{
898
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
899
if(sd < 0) {
900
perror("socket");
901
exitcode = EXIT_FAILURE;
902
goto end;
903
}
904
strcpy(network.ifr_name, interface);
905
ret = ioctl(sd, SIOCGIFFLAGS, &network);
906
if(ret == -1){
907
perror("ioctl SIOCGIFFLAGS");
908
exitcode = EXIT_FAILURE;
909
goto end;
910
}
911
if((network.ifr_flags & IFF_UP) == 0){
912
network.ifr_flags |= IFF_UP;
913
ret = ioctl(sd, SIOCSIFFLAGS, &network);
914
if(ret == -1){
915
perror("ioctl SIOCSIFFLAGS");
916
exitcode = EXIT_FAILURE;
917
goto end;
918
}
919
}
920
close(sd);
921
}
922
923
uid = getuid();
924
gid = getgid();
925
926
ret = setuid(uid);
927
if (ret == -1){
928
perror("setuid");
929
}
930
931
setgid(gid);
932
if (ret == -1){
933
perror("setgid");
934
}
935
936
if_index = (AvahiIfIndex) if_nametoindex(interface);
937
if(if_index == 0){
938
fprintf(stderr, "No such interface: \"%s\"\n", interface);
939
exit(EXIT_FAILURE);
940
}
941
942
if(connect_to != NULL){
943
/* Connect directly, do not use Zeroconf */
944
/* (Mainly meant for debugging) */
945
char *address = strrchr(connect_to, ':');
946
if(address == NULL){
947
fprintf(stderr, "No colon in address\n");
948
exitcode = EXIT_FAILURE;
949
goto end;
950
}
1925
int exitcode = EXIT_SUCCESS;
1926
char *interfaces_to_take_down = NULL;
1927
size_t interfaces_to_take_down_size = 0;
1928
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1929
char old_tempdir[] = "/tmp/mandosXXXXXX";
1930
char *tempdir = NULL;
1931
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1932
const char *seckey = PATHDIR "/" SECKEY;
1933
const char *pubkey = PATHDIR "/" PUBKEY;
1934
char *interfaces_hooks = NULL;
1935
1936
bool gnutls_initialized = false;
1937
bool gpgme_initialized = false;
1938
float delay = 2.5f;
1939
double retry_interval = 10; /* 10s between trying a server and
1940
retrying the same server again */
1941
1942
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1943
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1944
1945
uid = getuid();
1946
gid = getgid();
1947
1948
/* Lower any group privileges we might have, just to be safe */
1949
errno = 0;
1950
ret = setgid(gid);
1951
if(ret == -1){
1952
perror_plus("setgid");
1953
}
1954
1955
/* Lower user privileges (temporarily) */
1956
errno = 0;
1957
ret = seteuid(uid);
1958
if(ret == -1){
1959
perror_plus("seteuid");
1960
}
1961
1962
if(quit_now){
1963
goto end;
1964
}
1965
1966
{
1967
struct argp_option options[] = {
1968
{ .name = "debug", .key = 128,
1969
.doc = "Debug mode", .group = 3 },
1970
{ .name = "connect", .key = 'c',
1971
.arg = "ADDRESS:PORT",
1972
.doc = "Connect directly to a specific Mandos server",
1973
.group = 1 },
1974
{ .name = "interface", .key = 'i',
1975
.arg = "NAME",
1976
.doc = "Network interface that will be used to search for"
1977
" Mandos servers",
1978
.group = 1 },
1979
{ .name = "seckey", .key = 's',
1980
.arg = "FILE",
1981
.doc = "OpenPGP secret key file base name",
1982
.group = 1 },
1983
{ .name = "pubkey", .key = 'p',
1984
.arg = "FILE",
1985
.doc = "OpenPGP public key file base name",
1986
.group = 2 },
1987
{ .name = "dh-bits", .key = 129,
1988
.arg = "BITS",
1989
.doc = "Bit length of the prime number used in the"
1990
" Diffie-Hellman key exchange",
1991
.group = 2 },
1992
{ .name = "priority", .key = 130,
1993
.arg = "STRING",
1994
.doc = "GnuTLS priority string for the TLS handshake",
1995
.group = 1 },
1996
{ .name = "delay", .key = 131,
1997
.arg = "SECONDS",
1998
.doc = "Maximum delay to wait for interface startup",
1999
.group = 2 },
2000
{ .name = "retry", .key = 132,
2001
.arg = "SECONDS",
2002
.doc = "Retry interval used when denied by the Mandos server",
2003
.group = 2 },
2004
{ .name = "network-hook-dir", .key = 133,
2005
.arg = "DIR",
2006
.doc = "Directory where network hooks are located",
2007
.group = 2 },
2008
/*
2009
* These reproduce what we would get without ARGP_NO_HELP
2010
*/
2011
{ .name = "help", .key = '?',
2012
.doc = "Give this help list", .group = -1 },
2013
{ .name = "usage", .key = -3,
2014
.doc = "Give a short usage message", .group = -1 },
2015
{ .name = "version", .key = 'V',
2016
.doc = "Print program version", .group = -1 },
2017
{ .name = NULL }
2018
};
2019
2020
error_t parse_opt(int key, char *arg,
2021
struct argp_state *state){
951
2022
errno = 0;
952
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
953
if(errno){
954
perror("Bad port number");
955
exitcode = EXIT_FAILURE;
2023
switch(key){
2024
case 128: /* --debug */
2025
debug = true;
2026
break;
2027
case 'c': /* --connect */
2028
connect_to = arg;
2029
break;
2030
case 'i': /* --interface */
2031
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2032
arg, (int)',');
2033
if(ret_errno != 0){
2034
argp_error(state, "%s", strerror(ret_errno));
2035
}
2036
break;
2037
case 's': /* --seckey */
2038
seckey = arg;
2039
break;
2040
case 'p': /* --pubkey */
2041
pubkey = arg;
2042
break;
2043
case 129: /* --dh-bits */
2044
errno = 0;
2045
tmpmax = strtoimax(arg, &tmp, 10);
2046
if(errno != 0 or tmp == arg or *tmp != '\0'
2047
or tmpmax != (typeof(mc.dh_bits))tmpmax){
2048
argp_error(state, "Bad number of DH bits");
2049
}
2050
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2051
break;
2052
case 130: /* --priority */
2053
mc.priority = arg;
2054
break;
2055
case 131: /* --delay */
2056
errno = 0;
2057
delay = strtof(arg, &tmp);
2058
if(errno != 0 or tmp == arg or *tmp != '\0'){
2059
argp_error(state, "Bad delay");
2060
}
2061
case 132: /* --retry */
2062
errno = 0;
2063
retry_interval = strtod(arg, &tmp);
2064
if(errno != 0 or tmp == arg or *tmp != '\0'
2065
or (retry_interval * 1000) > INT_MAX
2066
or retry_interval < 0){
2067
argp_error(state, "Bad retry interval");
2068
}
2069
break;
2070
case 133: /* --network-hook-dir */
2071
hookdir = arg;
2072
break;
2073
/*
2074
* These reproduce what we would get without ARGP_NO_HELP
2075
*/
2076
case '?': /* --help */
2077
argp_state_help(state, state->out_stream,
2078
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2079
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2080
case -3: /* --usage */
2081
argp_state_help(state, state->out_stream,
2082
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2083
case 'V': /* --version */
2084
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2085
exit(argp_err_exit_status);
2086
break;
2087
default:
2088
return ARGP_ERR_UNKNOWN;
2089
}
2090
return errno;
2091
}
2092
2093
struct argp argp = { .options = options, .parser = parse_opt,
2094
.args_doc = "",
2095
.doc = "Mandos client -- Get and decrypt"
2096
" passwords from a Mandos server" };
2097
ret = argp_parse(&argp, argc, argv,
2098
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2099
switch(ret){
2100
case 0:
2101
break;
2102
case ENOMEM:
2103
default:
2104
errno = ret;
2105
perror_plus("argp_parse");
2106
exitcode = EX_OSERR;
2107
goto end;
2108
case EINVAL:
2109
exitcode = EX_USAGE;
2110
goto end;
2111
}
2112
}
2113
2114
{
2115
/* Work around Debian bug #633582:
2116
<http://bugs.debian.org/633582> */
2117
2118
/* Re-raise privileges */
2119
ret_errno = raise_privileges();
2120
if(ret_errno != 0){
2121
errno = ret_errno;
2122
perror_plus("Failed to raise privileges");
2123
} else {
2124
struct stat st;
2125
2126
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2127
int seckey_fd = open(seckey, O_RDONLY);
2128
if(seckey_fd == -1){
2129
perror_plus("open");
2130
} else {
2131
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2132
if(ret == -1){
2133
perror_plus("fstat");
2134
} else {
2135
if(S_ISREG(st.st_mode)
2136
and st.st_uid == 0 and st.st_gid == 0){
2137
ret = fchown(seckey_fd, uid, gid);
2138
if(ret == -1){
2139
perror_plus("fchown");
2140
}
2141
}
2142
}
2143
TEMP_FAILURE_RETRY(close(seckey_fd));
2144
}
2145
}
2146
2147
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2148
int pubkey_fd = open(pubkey, O_RDONLY);
2149
if(pubkey_fd == -1){
2150
perror_plus("open");
2151
} else {
2152
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2153
if(ret == -1){
2154
perror_plus("fstat");
2155
} else {
2156
if(S_ISREG(st.st_mode)
2157
and st.st_uid == 0 and st.st_gid == 0){
2158
ret = fchown(pubkey_fd, uid, gid);
2159
if(ret == -1){
2160
perror_plus("fchown");
2161
}
2162
}
2163
}
2164
TEMP_FAILURE_RETRY(close(pubkey_fd));
2165
}
2166
}
2167
2168
/* Lower privileges */
2169
ret_errno = lower_privileges();
2170
if(ret_errno != 0){
2171
errno = ret_errno;
2172
perror_plus("Failed to lower privileges");
2173
}
2174
}
2175
}
2176
2177
/* Remove invalid interface names (except "none") */
2178
{
2179
char *interface = NULL;
2180
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2181
interface))){
2182
if(strcmp(interface, "none") != 0
2183
and if_nametoindex(interface) == 0){
2184
if(interface[0] != '\0'){
2185
fprintf_plus(stderr, "Not using nonexisting interface"
2186
" \"%s\"\n", interface);
2187
}
2188
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2189
interface = NULL;
2190
}
2191
}
2192
}
2193
2194
/* Run network hooks */
2195
{
2196
if(mc.interfaces != NULL){
2197
interfaces_hooks = malloc(mc.interfaces_size);
2198
if(interfaces_hooks == NULL){
2199
perror_plus("malloc");
956
2200
goto end;
957
2201
}
958
*address = '\0';
959
address = connect_to;
960
ret = start_mandos_communication(address, port, if_index, &mc);
961
if(ret < 0){
962
exitcode = EXIT_FAILURE;
963
} else {
964
exitcode = EXIT_SUCCESS;
965
}
966
goto end;
967
}
968
969
if (not debug){
970
avahi_set_log_function(empty_log);
971
}
972
973
/* Initialize the pseudo-RNG for Avahi */
974
srand((unsigned int) time(NULL));
975
976
/* Allocate main Avahi loop object */
977
mc.simple_poll = avahi_simple_poll_new();
978
if (mc.simple_poll == NULL) {
979
fprintf(stderr, "Avahi: Failed to create simple poll"
980
" object.\n");
981
exitcode = EXIT_FAILURE;
982
goto end;
983
}
984
985
{
986
AvahiServerConfig config;
987
/* Do not publish any local Zeroconf records */
988
avahi_server_config_init(&config);
989
config.publish_hinfo = 0;
990
config.publish_addresses = 0;
991
config.publish_workstation = 0;
992
config.publish_domain = 0;
993
994
/* Allocate a new server */
995
mc.server = avahi_server_new(avahi_simple_poll_get
996
(mc.simple_poll), &config, NULL,
997
NULL, &error);
998
999
/* Free the Avahi configuration data */
1000
avahi_server_config_free(&config);
1001
}
1002
1003
/* Check if creating the Avahi server object succeeded */
1004
if (mc.server == NULL) {
1005
fprintf(stderr, "Failed to create Avahi server: %s\n",
1006
avahi_strerror(error));
1007
exitcode = EXIT_FAILURE;
1008
goto end;
1009
}
1010
1011
/* Create the Avahi service browser */
1012
sb = avahi_s_service_browser_new(mc.server, if_index,
1013
AVAHI_PROTO_INET6,
1014
"_mandos._tcp", NULL, 0,
1015
browse_callback, &mc);
1016
if (sb == NULL) {
1017
fprintf(stderr, "Failed to create service browser: %s\n",
1018
avahi_strerror(avahi_server_errno(mc.server)));
1019
exitcode = EXIT_FAILURE;
1020
goto end;
1021
}
1022
1023
/* Run the main loop */
1024
1025
if (debug){
1026
fprintf(stderr, "Starting Avahi loop search\n");
1027
}
1028
1029
avahi_simple_poll_loop(mc.simple_poll);
1030
2202
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2203
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2204
}
2205
run_network_hooks("start", interfaces_hooks != NULL ?
2206
interfaces_hooks : "", delay);
2207
}
2208
2209
if(not debug){
2210
avahi_set_log_function(empty_log);
2211
}
2212
2213
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2214
from the signal handler */
2215
/* Initialize the pseudo-RNG for Avahi */
2216
srand((unsigned int) time(NULL));
2217
simple_poll = avahi_simple_poll_new();
2218
if(simple_poll == NULL){
2219
fprintf_plus(stderr,
2220
"Avahi: Failed to create simple poll object.\n");
2221
exitcode = EX_UNAVAILABLE;
2222
goto end;
2223
}
2224
2225
sigemptyset(&sigterm_action.sa_mask);
2226
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2227
if(ret == -1){
2228
perror_plus("sigaddset");
2229
exitcode = EX_OSERR;
2230
goto end;
2231
}
2232
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2233
if(ret == -1){
2234
perror_plus("sigaddset");
2235
exitcode = EX_OSERR;
2236
goto end;
2237
}
2238
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2239
if(ret == -1){
2240
perror_plus("sigaddset");
2241
exitcode = EX_OSERR;
2242
goto end;
2243
}
2244
/* Need to check if the handler is SIG_IGN before handling:
2245
| [[info:libc:Initial Signal Actions]] |
2246
| [[info:libc:Basic Signal Handling]] |
2247
*/
2248
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2249
if(ret == -1){
2250
perror_plus("sigaction");
2251
return EX_OSERR;
2252
}
2253
if(old_sigterm_action.sa_handler != SIG_IGN){
2254
ret = sigaction(SIGINT, &sigterm_action, NULL);
2255
if(ret == -1){
2256
perror_plus("sigaction");
2257
exitcode = EX_OSERR;
2258
goto end;
2259
}
2260
}
2261
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2262
if(ret == -1){
2263
perror_plus("sigaction");
2264
return EX_OSERR;
2265
}
2266
if(old_sigterm_action.sa_handler != SIG_IGN){
2267
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2268
if(ret == -1){
2269
perror_plus("sigaction");
2270
exitcode = EX_OSERR;
2271
goto end;
2272
}
2273
}
2274
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2275
if(ret == -1){
2276
perror_plus("sigaction");
2277
return EX_OSERR;
2278
}
2279
if(old_sigterm_action.sa_handler != SIG_IGN){
2280
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2281
if(ret == -1){
2282
perror_plus("sigaction");
2283
exitcode = EX_OSERR;
2284
goto end;
2285
}
2286
}
2287
2288
/* If no interfaces were specified, make a list */
2289
if(mc.interfaces == NULL){
2290
struct dirent **direntries;
2291
/* Look for any good interfaces */
2292
ret = scandir(sys_class_net, &direntries, good_interface,
2293
alphasort);
2294
if(ret >= 1){
2295
/* Add all found interfaces to interfaces list */
2296
for(int i = 0; i < ret; ++i){
2297
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2298
direntries[i]->d_name);
2299
if(ret_errno != 0){
2300
errno = ret_errno;
2301
perror_plus("argz_add");
2302
continue;
2303
}
2304
if(debug){
2305
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2306
direntries[i]->d_name);
2307
}
2308
}
2309
free(direntries);
2310
} else {
2311
free(direntries);
2312
fprintf_plus(stderr, "Could not find a network interface\n");
2313
exitcode = EXIT_FAILURE;
2314
goto end;
2315
}
2316
}
2317
2318
/* Bring up interfaces which are down, and remove any "none"s */
2319
{
2320
char *interface = NULL;
2321
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2322
interface))){
2323
/* If interface name is "none", stop bringing up interfaces.
2324
Also remove all instances of "none" from the list */
2325
if(strcmp(interface, "none") == 0){
2326
argz_delete(&mc.interfaces, &mc.interfaces_size,
2327
interface);
2328
interface = NULL;
2329
while((interface = argz_next(mc.interfaces,
2330
mc.interfaces_size, interface))){
2331
if(strcmp(interface, "none") == 0){
2332
argz_delete(&mc.interfaces, &mc.interfaces_size,
2333
interface);
2334
interface = NULL;
2335
}
2336
}
2337
break;
2338
}
2339
bool interface_was_up = interface_is_up(interface);
2340
errno = bring_up_interface(interface, delay);
2341
if(not interface_was_up){
2342
if(errno != 0){
2343
perror_plus("Failed to bring up interface");
2344
} else {
2345
errno = argz_add(&interfaces_to_take_down,
2346
&interfaces_to_take_down_size,
2347
interface);
2348
if(errno != 0){
2349
perror_plus("argz_add");
2350
}
2351
}
2352
}
2353
}
2354
if(debug and (interfaces_to_take_down == NULL)){
2355
fprintf_plus(stderr, "No interfaces were brought up\n");
2356
}
2357
}
2358
2359
/* If we only got one interface, explicitly use only that one */
2360
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2361
if(debug){
2362
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2363
mc.interfaces);
2364
}
2365
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2366
}
2367
2368
if(quit_now){
2369
goto end;
2370
}
2371
2372
ret = init_gnutls_global(pubkey, seckey, &mc);
2373
if(ret == -1){
2374
fprintf_plus(stderr, "init_gnutls_global failed\n");
2375
exitcode = EX_UNAVAILABLE;
2376
goto end;
2377
} else {
2378
gnutls_initialized = true;
2379
}
2380
2381
if(quit_now){
2382
goto end;
2383
}
2384
2385
/* Try /run/tmp before /tmp */
2386
tempdir = mkdtemp(run_tempdir);
2387
if(tempdir == NULL and errno == ENOENT){
2388
if(debug){
2389
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2390
run_tempdir, old_tempdir);
2391
}
2392
tempdir = mkdtemp(old_tempdir);
2393
}
2394
if(tempdir == NULL){
2395
perror_plus("mkdtemp");
2396
goto end;
2397
}
2398
2399
if(quit_now){
2400
goto end;
2401
}
2402
2403
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2404
fprintf_plus(stderr, "init_gpgme failed\n");
2405
exitcode = EX_UNAVAILABLE;
2406
goto end;
2407
} else {
2408
gpgme_initialized = true;
2409
}
2410
2411
if(quit_now){
2412
goto end;
2413
}
2414
2415
if(connect_to != NULL){
2416
/* Connect directly, do not use Zeroconf */
2417
/* (Mainly meant for debugging) */
2418
char *address = strrchr(connect_to, ':');
2419
2420
if(address == NULL){
2421
fprintf_plus(stderr, "No colon in address\n");
2422
exitcode = EX_USAGE;
2423
goto end;
2424
}
2425
2426
if(quit_now){
2427
goto end;
2428
}
2429
2430
in_port_t port;
2431
errno = 0;
2432
tmpmax = strtoimax(address+1, &tmp, 10);
2433
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2434
or tmpmax != (in_port_t)tmpmax){
2435
fprintf_plus(stderr, "Bad port number\n");
2436
exitcode = EX_USAGE;
2437
goto end;
2438
}
2439
2440
if(quit_now){
2441
goto end;
2442
}
2443
2444
port = (in_port_t)tmpmax;
2445
*address = '\0';
2446
/* Colon in address indicates IPv6 */
2447
int af;
2448
if(strchr(connect_to, ':') != NULL){
2449
af = AF_INET6;
2450
/* Accept [] around IPv6 address - see RFC 5952 */
2451
if(connect_to[0] == '[' and address[-1] == ']')
2452
{
2453
connect_to++;
2454
address[-1] = '\0';
2455
}
2456
} else {
2457
af = AF_INET;
2458
}
2459
address = connect_to;
2460
2461
if(quit_now){
2462
goto end;
2463
}
2464
2465
while(not quit_now){
2466
ret = start_mandos_communication(address, port, if_index, af,
2467
&mc);
2468
if(quit_now or ret == 0){
2469
break;
2470
}
2471
if(debug){
2472
fprintf_plus(stderr, "Retrying in %d seconds\n",
2473
(int)retry_interval);
2474
}
2475
sleep((unsigned int)retry_interval);
2476
}
2477
2478
if(not quit_now){
2479
exitcode = EXIT_SUCCESS;
2480
}
2481
2482
goto end;
2483
}
2484
2485
if(quit_now){
2486
goto end;
2487
}
2488
2489
{
2490
AvahiServerConfig config;
2491
/* Do not publish any local Zeroconf records */
2492
avahi_server_config_init(&config);
2493
config.publish_hinfo = 0;
2494
config.publish_addresses = 0;
2495
config.publish_workstation = 0;
2496
config.publish_domain = 0;
2497
2498
/* Allocate a new server */
2499
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2500
&config, NULL, NULL, &ret_errno);
2501
2502
/* Free the Avahi configuration data */
2503
avahi_server_config_free(&config);
2504
}
2505
2506
/* Check if creating the Avahi server object succeeded */
2507
if(mc.server == NULL){
2508
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2509
avahi_strerror(ret_errno));
2510
exitcode = EX_UNAVAILABLE;
2511
goto end;
2512
}
2513
2514
if(quit_now){
2515
goto end;
2516
}
2517
2518
/* Create the Avahi service browser */
2519
sb = avahi_s_service_browser_new(mc.server, if_index,
2520
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2521
NULL, 0, browse_callback,
2522
(void *)&mc);
2523
if(sb == NULL){
2524
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2525
avahi_strerror(avahi_server_errno(mc.server)));
2526
exitcode = EX_UNAVAILABLE;
2527
goto end;
2528
}
2529
2530
if(quit_now){
2531
goto end;
2532
}
2533
2534
/* Run the main loop */
2535
2536
if(debug){
2537
fprintf_plus(stderr, "Starting Avahi loop search\n");
2538
}
2539
2540
ret = avahi_loop_with_timeout(simple_poll,
2541
(int)(retry_interval * 1000), &mc);
2542
if(debug){
2543
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2544
(ret == 0) ? "successfully" : "with error");
2545
}
2546
1031
2547
end:
1032
1033
if (debug){
1034
fprintf(stderr, "%s exiting\n", argv[0]);
1035
}
1036
1037
/* Cleanup things */
1038
if (sb != NULL)
1039
avahi_s_service_browser_free(sb);
1040
1041
if (mc.server != NULL)
1042
avahi_server_free(mc.server);
1043
1044
if (mc.simple_poll != NULL)
1045
avahi_simple_poll_free(mc.simple_poll);
1046
free(pubkeyfilename);
1047
free(seckeyfilename);
1048
1049
if (gnutls_initalized){
1050
gnutls_certificate_free_credentials(mc.cred);
1051
gnutls_global_deinit ();
1052
}
1053
1054
return exitcode;
2548
2549
if(debug){
2550
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2551
}
2552
2553
/* Cleanup things */
2554
free(mc.interfaces);
2555
2556
if(sb != NULL)
2557
avahi_s_service_browser_free(sb);
2558
2559
if(mc.server != NULL)
2560
avahi_server_free(mc.server);
2561
2562
if(simple_poll != NULL)
2563
avahi_simple_poll_free(simple_poll);
2564
2565
if(gnutls_initialized){
2566
gnutls_certificate_free_credentials(mc.cred);
2567
gnutls_global_deinit();
2568
gnutls_dh_params_deinit(mc.dh_params);
2569
}
2570
2571
if(gpgme_initialized){
2572
gpgme_release(mc.ctx);
2573
}
2574
2575
/* Cleans up the circular linked list of Mandos servers the client
2576
has seen */
2577
if(mc.current_server != NULL){
2578
mc.current_server->prev->next = NULL;
2579
while(mc.current_server != NULL){
2580
server *next = mc.current_server->next;
2581
free(mc.current_server);
2582
mc.current_server = next;
2583
}
2584
}
2585
2586
/* Re-raise privileges */
2587
{
2588
ret_errno = raise_privileges();
2589
if(ret_errno != 0){
2590
perror_plus("Failed to raise privileges");
2591
} else {
2592
2593
/* Run network hooks */
2594
run_network_hooks("stop", interfaces_hooks != NULL ?
2595
interfaces_hooks : "", delay);
2596
2597
/* Take down the network interfaces which were brought up */
2598
{
2599
char *interface = NULL;
2600
while((interface=argz_next(interfaces_to_take_down,
2601
interfaces_to_take_down_size,
2602
interface))){
2603
ret_errno = take_down_interface(interface);
2604
if(ret_errno != 0){
2605
errno = ret_errno;
2606
perror_plus("Failed to take down interface");
2607
}
2608
}
2609
if(debug and (interfaces_to_take_down == NULL)){
2610
fprintf_plus(stderr, "No interfaces needed to be taken"
2611
" down\n");
2612
}
2613
}
2614
}
2615
2616
ret_errno = lower_privileges_permanently();
2617
if(ret_errno != 0){
2618
perror_plus("Failed to lower privileges permanently");
2619
}
2620
}
2621
2622
free(interfaces_to_take_down);
2623
free(interfaces_hooks);
2624
2625
/* Removes the GPGME temp directory and all files inside */
2626
if(tempdir != NULL){
2627
struct dirent **direntries = NULL;
2628
struct dirent *direntry = NULL;
2629
int numentries = scandir(tempdir, &direntries, notdotentries,
2630
alphasort);
2631
if(numentries > 0){
2632
for(int i = 0; i < numentries; i++){
2633
direntry = direntries[i];
2634
char *fullname = NULL;
2635
ret = asprintf(&fullname, "%s/%s", tempdir,
2636
direntry->d_name);
2637
if(ret < 0){
2638
perror_plus("asprintf");
2639
continue;
2640
}
2641
ret = remove(fullname);
2642
if(ret == -1){
2643
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2644
strerror(errno));
2645
}
2646
free(fullname);
2647
}
2648
}
2649
2650
/* need to clean even if 0 because man page doesn't specify */
2651
free(direntries);
2652
if(numentries == -1){
2653
perror_plus("scandir");
2654
}
2655
ret = rmdir(tempdir);
2656
if(ret == -1 and errno != ENOENT){
2657
perror_plus("rmdir");
2658
}
2659
}
2660
2661
if(quit_now){
2662
sigemptyset(&old_sigterm_action.sa_mask);
2663
old_sigterm_action.sa_handler = SIG_DFL;
2664
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2665
&old_sigterm_action,
2666
NULL));
2667
if(ret == -1){
2668
perror_plus("sigaction");
2669
}
2670
do {
2671
ret = raise(signal_received);
2672
} while(ret != 0 and errno == EINTR);
2673
if(ret != 0){
2674
perror_plus("raise");
2675
abort();
2676
}
2677
TEMP_FAILURE_RETRY(pause());
2678
}
2679
2680
return exitcode;
1055
2681
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0