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- Committer: Teddy Hogeborn
- Date: 2008-08-25 01:16:38 UTC
- Revision ID: teddy@fukt.bsnet.se-20080825011638-zgqej2cafhne05ay
* mandos-keygen: Strip 24-bit checksum of Radix-64 from output to make
output strictly base64.
output strictly base64.
- files added:
- plugins.d/usplash
- files removed:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- debian/upstream
- network-hooks.d
- files renamed:
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.xml
- files modified:
- Makefile
added
removed
plugins.d/password-request.c
1
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
* Mandos-client - get and decrypt data from a Mandos server
3
* Mandos client - get and decrypt data from a Mandos server
4
4
*
5
5
* This program is partly derived from an example program for an Avahi
6
6
* service browser, downloaded from
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 Björn Påhlsson
12
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
14
13
*
15
14
* This program is free software: you can redistribute it and/or
16
15
* modify it under the terms of the GNU General Public License as
26
25
* along with this program. If not, see
27
26
* <http://www.gnu.org/licenses/>.
28
27
*
29
* Contact the authors at <mandos@recompile.se>.
28
* Contact the authors at <mandos@fukt.bsnet.se>.
30
29
*/
31
30
32
31
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
34
32
#define _LARGEFILE_SOURCE
35
#endif /* not _LARGEFILE_SOURCE */
36
#ifndef _FILE_OFFSET_BITS
37
33
#define _FILE_OFFSET_BITS 64
38
#endif /* not _FILE_OFFSET_BITS */
39
34
40
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
36
42
37
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
38
stdout, ferror() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
39
#include <stdint.h> /* uint16_t, uint32_t */
45
40
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
#include <stdbool.h> /* bool, false, true */
41
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
42
srand() */
43
#include <stdbool.h> /* bool, true */
49
44
#include <string.h> /* memset(), strcmp(), strlen(),
50
45
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
46
#include <sys/ioctl.h> /* ioctl */
52
47
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
48
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
49
SOCK_STREAM, INET6_ADDRSTRLEN,
50
uid_t, gid_t */
51
#include <inttypes.h> /* PRIu16 */
57
52
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
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() */
53
struct in6_addr, inet_pton(),
54
connect() */
55
#include <assert.h> /* assert() */
56
#include <errno.h> /* perror(), errno */
57
#include <time.h> /* time() */
68
58
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
59
SIOCSIFFLAGS, if_indextoname(),
70
60
if_nametoindex(), IF_NAMESIZE */
71
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
*/
74
61
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
79
#include <iso646.h> /* not, or, and */
62
getuid(), getgid(), setuid(),
63
setgid() */
64
#include <netinet/in.h>
65
#include <arpa/inet.h> /* inet_pton(), htons */
66
#include <iso646.h> /* not, and */
80
67
#include <argp.h> /* struct argp_option, error_t, struct
81
68
argp_state, struct argp,
82
69
argp_parse(), ARGP_KEY_ARG,
83
70
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
84
#include <signal.h> /* sigemptyset(), sigaddset(),
85
sigaction(), SIGTERM, sig_atomic_t,
86
raise() */
87
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
88
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
89
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
90
WEXITSTATUS(), WTERMSIG() */
91
#include <grp.h> /* setgroups() */
92
#include <argz.h> /* argz_add_sep(), argz_next(),
93
argz_delete(), argz_append(),
94
argz_stringify(), argz_add(),
95
argz_count() */
96
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
97
EAI_SYSTEM, gai_strerror() */
98
99
#ifdef __linux__
100
#include <sys/klog.h> /* klogctl() */
101
#endif /* __linux__ */
102
71
103
72
/* Avahi */
104
73
/* All Avahi types, constants and functions
117
86
gnutls_*
118
87
init_gnutls_session(),
119
88
GNUTLS_* */
120
#include <gnutls/openpgp.h>
121
/* gnutls_certificate_set_openpgp_key_file(),
122
GNUTLS_OPENPGP_FMT_BASE64 */
89
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
90
GNUTLS_OPENPGP_FMT_BASE64 */
123
91
124
92
/* GPGME */
125
93
#include <gpgme.h> /* All GPGME types, constants and
130
98
131
99
#define BUFFER_SIZE 256
132
100
133
#define PATHDIR "/conf/conf.d/mandos"
134
#define SECKEY "seckey.txt"
135
#define PUBKEY "pubkey.txt"
136
#define HOOKDIR "/lib/mandos/network-hooks.d"
137
138
101
bool debug = false;
102
static const char *keydir = "/conf/conf.d/mandos";
139
103
static const char mandos_protocol_version[] = "1";
140
const char *argp_program_version = "mandos-client " VERSION;
141
const char *argp_program_bug_address = "<mandos@recompile.se>";
142
static const char sys_class_net[] = "/sys/class/net";
143
char *connect_to = NULL;
144
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
146
uid_t uid = 65534;
147
gid_t gid = 65534;
148
149
/* Doubly linked list that need to be circularly linked when used */
150
typedef struct server{
151
const char *ip;
152
in_port_t port;
153
AvahiIfIndex if_index;
154
int af;
155
struct timespec last_seen;
156
struct server *next;
157
struct server *prev;
158
} server;
104
const char *argp_program_version = "password-request 1.0";
105
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
159
106
160
107
/* Used for passing in values through the Avahi callback functions */
161
108
typedef struct {
109
AvahiSimplePoll *simple_poll;
162
110
AvahiServer *server;
163
111
gnutls_certificate_credentials_t cred;
164
112
unsigned int dh_bits;
165
113
gnutls_dh_params_t dh_params;
166
114
const char *priority;
167
gpgme_ctx_t ctx;
168
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
171
115
} mandos_context;
172
116
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
175
176
sig_atomic_t quit_now = 0;
177
int signal_received = 0;
178
179
/* Function to use when printing errors */
180
void perror_plus(const char *print_text){
181
int e = errno;
182
fprintf(stderr, "Mandos plugin %s: ",
183
program_invocation_short_name);
184
errno = e;
185
perror(print_text);
186
}
187
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
189
int fprintf_plus(FILE *stream, const char *format, ...){
190
va_list ap;
191
va_start (ap, format);
192
193
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
194
program_invocation_short_name));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
196
}
197
198
117
/*
199
* Make additional room in "buffer" for at least BUFFER_SIZE more
200
* bytes. "buffer_capacity" is how much is currently allocated,
118
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
119
* "buffer_capacity" is how much is currently allocated,
201
120
* "buffer_length" is how much is already used.
202
121
*/
203
__attribute__((nonnull, warn_unused_result))
204
size_t incbuffer(char **buffer, size_t buffer_length,
205
size_t buffer_capacity){
206
if(buffer_length + BUFFER_SIZE > buffer_capacity){
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
208
if(new_buf == NULL){
209
int old_errno = errno;
210
free(*buffer);
211
errno = old_errno;
212
*buffer = NULL;
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){
213
127
return 0;
214
128
}
215
*buffer = new_buf;
216
129
buffer_capacity += BUFFER_SIZE;
217
130
}
218
131
return buffer_capacity;
219
132
}
220
133
221
/* Add server to set of servers to retry periodically */
222
__attribute__((nonnull, warn_unused_result))
223
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
224
int af, server **current_server){
225
int ret;
226
server *new_server = malloc(sizeof(server));
227
if(new_server == NULL){
228
perror_plus("malloc");
229
return false;
230
}
231
*new_server = (server){ .ip = strdup(ip),
232
.port = port,
233
.if_index = if_index,
234
.af = af };
235
if(new_server->ip == NULL){
236
perror_plus("strdup");
237
free(new_server);
238
return false;
239
}
240
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
241
if(ret == -1){
242
perror_plus("clock_gettime");
243
#ifdef __GNUC__
244
#pragma GCC diagnostic push
245
#pragma GCC diagnostic ignored "-Wcast-qual"
246
#endif
247
free((char *)(new_server->ip));
248
#ifdef __GNUC__
249
#pragma GCC diagnostic pop
250
#endif
251
free(new_server);
252
return false;
253
}
254
/* Special case of first server */
255
if(*current_server == NULL){
256
new_server->next = new_server;
257
new_server->prev = new_server;
258
*current_server = new_server;
259
} else {
260
/* Place the new server last in the list */
261
new_server->next = *current_server;
262
new_server->prev = (*current_server)->prev;
263
new_server->prev->next = new_server;
264
(*current_server)->prev = new_server;
265
}
266
return true;
267
}
268
269
134
/*
270
* Initialize GPGME.
135
* Decrypt OpenPGP data using keyrings in HOMEDIR.
136
* Returns -1 on error
271
137
*/
272
__attribute__((nonnull, warn_unused_result))
273
static bool init_gpgme(const char * const seckey,
274
const char * const pubkey,
275
const char * const tempdir,
276
mandos_context *mc){
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;
277
144
gpgme_error_t rc;
145
ssize_t ret;
146
size_t plaintext_capacity = 0;
147
ssize_t plaintext_length = 0;
278
148
gpgme_engine_info_t engine_info;
279
149
280
/*
281
* Helper function to insert pub and seckey to the engine keyring.
282
*/
283
bool import_key(const char * const filename){
284
int ret;
285
int fd;
286
gpgme_data_t pgp_data;
287
288
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
289
if(fd == -1){
290
perror_plus("open");
291
return false;
292
}
293
294
rc = gpgme_data_new_from_fd(&pgp_data, fd);
295
if(rc != GPG_ERR_NO_ERROR){
296
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
297
gpgme_strsource(rc), gpgme_strerror(rc));
298
return false;
299
}
300
301
rc = gpgme_op_import(mc->ctx, pgp_data);
302
if(rc != GPG_ERR_NO_ERROR){
303
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
304
gpgme_strsource(rc), gpgme_strerror(rc));
305
return false;
306
}
307
308
ret = (int)TEMP_FAILURE_RETRY(close(fd));
309
if(ret == -1){
310
perror_plus("close");
311
}
312
gpgme_data_release(pgp_data);
313
return true;
314
}
315
316
if(debug){
317
fprintf_plus(stderr, "Initializing GPGME\n");
150
if (debug){
151
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
318
152
}
319
153
320
154
/* Init GPGME */
321
155
gpgme_check_version(NULL);
322
156
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
323
if(rc != GPG_ERR_NO_ERROR){
324
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
325
gpgme_strsource(rc), gpgme_strerror(rc));
326
return false;
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;
327
161
}
328
162
329
163
/* Set GPGME home directory for the OpenPGP engine only */
330
rc = gpgme_get_engine_info(&engine_info);
331
if(rc != GPG_ERR_NO_ERROR){
332
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
333
gpgme_strsource(rc), gpgme_strerror(rc));
334
return false;
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;
335
169
}
336
170
while(engine_info != NULL){
337
171
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
338
172
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
339
engine_info->file_name, tempdir);
173
engine_info->file_name, homedir);
340
174
break;
341
175
}
342
176
engine_info = engine_info->next;
343
177
}
344
178
if(engine_info == NULL){
345
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
346
tempdir);
347
return false;
348
}
349
350
/* Create new GPGME "context" */
351
rc = gpgme_new(&(mc->ctx));
352
if(rc != GPG_ERR_NO_ERROR){
353
fprintf_plus(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
355
gpgme_strerror(rc));
356
return false;
357
}
358
359
if(not import_key(pubkey) or not import_key(seckey)){
360
return false;
361
}
362
363
return true;
364
}
365
366
/*
367
* Decrypt OpenPGP data.
368
* Returns -1 on error
369
*/
370
__attribute__((nonnull, warn_unused_result))
371
static ssize_t pgp_packet_decrypt(const char *cryptotext,
372
size_t crypto_size,
373
char **plaintext,
374
mandos_context *mc){
375
gpgme_data_t dh_crypto, dh_plain;
376
gpgme_error_t rc;
377
ssize_t ret;
378
size_t plaintext_capacity = 0;
379
ssize_t plaintext_length = 0;
380
381
if(debug){
382
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
179
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
180
return -1;
383
181
}
384
182
385
183
/* Create new GPGME data buffer from memory cryptotext */
386
184
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
387
185
0);
388
if(rc != GPG_ERR_NO_ERROR){
389
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
390
gpgme_strsource(rc), gpgme_strerror(rc));
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));
391
189
return -1;
392
190
}
393
191
394
192
/* Create new empty GPGME data buffer for the plaintext */
395
193
rc = gpgme_data_new(&dh_plain);
396
if(rc != GPG_ERR_NO_ERROR){
397
fprintf_plus(stderr, "Mandos plugin mandos-client: "
398
"bad gpgme_data_new: %s: %s\n",
399
gpgme_strsource(rc), gpgme_strerror(rc));
194
if (rc != GPG_ERR_NO_ERROR){
195
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
196
gpgme_strsource(rc), gpgme_strerror(rc));
400
197
gpgme_data_release(dh_crypto);
401
198
return -1;
402
199
}
403
200
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
404
210
/* Decrypt data from the cryptotext data buffer to the plaintext
405
211
data buffer */
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
407
if(rc != GPG_ERR_NO_ERROR){
408
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
409
gpgme_strsource(rc), gpgme_strerror(rc));
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));
410
216
plaintext_length = -1;
411
if(debug){
217
if (debug){
412
218
gpgme_decrypt_result_t result;
413
result = gpgme_op_decrypt_result(mc->ctx);
414
if(result == NULL){
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
219
result = gpgme_op_decrypt_result(ctx);
220
if (result == NULL){
221
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
416
222
} else {
417
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
418
result->unsupported_algorithm);
419
fprintf_plus(stderr, "Wrong key usage: %u\n",
420
result->wrong_key_usage);
223
fprintf(stderr, "Unsupported algorithm: %s\n",
224
result->unsupported_algorithm);
225
fprintf(stderr, "Wrong key usage: %u\n",
226
result->wrong_key_usage);
421
227
if(result->file_name != NULL){
422
fprintf_plus(stderr, "File name: %s\n", result->file_name);
228
fprintf(stderr, "File name: %s\n", result->file_name);
423
229
}
424
230
gpgme_recipient_t recipient;
425
231
recipient = result->recipients;
426
while(recipient != NULL){
427
fprintf_plus(stderr, "Public key algorithm: %s\n",
428
gpgme_pubkey_algo_name
429
(recipient->pubkey_algo));
430
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
431
fprintf_plus(stderr, "Secret key available: %s\n",
432
recipient->status == GPG_ERR_NO_SECKEY
433
? "No" : "Yes");
434
recipient = recipient->next;
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
}
435
242
}
436
243
}
437
244
}
439
246
}
440
247
441
248
if(debug){
442
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
249
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
443
250
}
444
251
445
252
/* Seek back to the beginning of the GPGME plaintext data buffer */
446
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
447
perror_plus("gpgme_data_seek");
253
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
254
perror("pgpme_data_seek");
448
255
plaintext_length = -1;
449
256
goto decrypt_end;
450
257
}
451
258
452
259
*plaintext = NULL;
453
260
while(true){
454
plaintext_capacity = incbuffer(plaintext,
455
(size_t)plaintext_length,
456
plaintext_capacity);
457
if(plaintext_capacity == 0){
458
perror_plus("incbuffer");
459
plaintext_length = -1;
460
goto decrypt_end;
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;
461
268
}
462
269
463
270
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
464
271
BUFFER_SIZE);
465
272
/* Print the data, if any */
466
if(ret == 0){
273
if (ret == 0){
467
274
/* EOF */
468
275
break;
469
276
}
470
277
if(ret < 0){
471
perror_plus("gpgme_data_read");
278
perror("gpgme_data_read");
472
279
plaintext_length = -1;
473
280
goto decrypt_end;
474
281
}
475
282
plaintext_length += ret;
476
283
}
477
284
478
285
if(debug){
479
fprintf_plus(stderr, "Decrypted password is: ");
286
fprintf(stderr, "Decrypted password is: ");
480
287
for(ssize_t i = 0; i < plaintext_length; i++){
481
288
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
482
289
}
493
300
return plaintext_length;
494
301
}
495
302
496
__attribute__((warn_unused_result))
497
static const char *safer_gnutls_strerror(int value){
498
const char *ret = gnutls_strerror(value);
499
if(ret == NULL)
303
static const char * safer_gnutls_strerror (int value) {
304
const char *ret = gnutls_strerror (value); /* Spurious warning */
305
if (ret == NULL)
500
306
ret = "(unknown)";
501
307
return ret;
502
308
}
503
309
504
310
/* GnuTLS log function callback */
505
__attribute__((nonnull))
506
311
static void debuggnutls(__attribute__((unused)) int level,
507
312
const char* string){
508
fprintf_plus(stderr, "GnuTLS: %s", string);
313
fprintf(stderr, "GnuTLS: %s", string);
509
314
}
510
315
511
__attribute__((nonnull, warn_unused_result))
512
static int init_gnutls_global(const char *pubkeyfilename,
513
const char *seckeyfilename,
514
mandos_context *mc){
316
static int init_gnutls_global(mandos_context *mc,
317
const char *pubkeyfilename,
318
const char *seckeyfilename){
515
319
int ret;
516
320
517
321
if(debug){
518
fprintf_plus(stderr, "Initializing GnuTLS\n");
322
fprintf(stderr, "Initializing GnuTLS\n");
519
323
}
520
324
521
325
ret = gnutls_global_init();
522
if(ret != GNUTLS_E_SUCCESS){
523
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
524
safer_gnutls_strerror(ret));
326
if (ret != GNUTLS_E_SUCCESS) {
327
fprintf (stderr, "GnuTLS global_init: %s\n",
328
safer_gnutls_strerror(ret));
525
329
return -1;
526
330
}
527
331
528
if(debug){
332
if (debug){
529
333
/* "Use a log level over 10 to enable all debugging options."
530
334
* - GnuTLS manual
531
335
*/
534
338
}
535
339
536
340
/* OpenPGP credentials */
537
ret = gnutls_certificate_allocate_credentials(&mc->cred);
538
if(ret != GNUTLS_E_SUCCESS){
539
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
540
safer_gnutls_strerror(ret));
541
gnutls_global_deinit();
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 ();
542
347
return -1;
543
348
}
544
349
545
350
if(debug){
546
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
547
" secret key %s as GnuTLS credentials\n",
548
pubkeyfilename,
549
seckeyfilename);
351
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
352
" and keyfile %s as GnuTLS credentials\n", pubkeyfilename,
353
seckeyfilename);
550
354
}
551
355
552
356
ret = gnutls_certificate_set_openpgp_key_file
553
357
(mc->cred, pubkeyfilename, seckeyfilename,
554
358
GNUTLS_OPENPGP_FMT_BASE64);
555
if(ret != GNUTLS_E_SUCCESS){
556
fprintf_plus(stderr,
557
"Error[%d] while reading the OpenPGP key pair ('%s',"
558
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
559
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
560
safer_gnutls_strerror(ret));
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));
561
365
goto globalfail;
562
366
}
563
367
564
368
/* GnuTLS server initialization */
565
369
ret = gnutls_dh_params_init(&mc->dh_params);
566
if(ret != GNUTLS_E_SUCCESS){
567
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
568
" initialization: %s\n",
569
safer_gnutls_strerror(ret));
370
if (ret != GNUTLS_E_SUCCESS) {
371
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
372
" %s\n", safer_gnutls_strerror(ret));
570
373
goto globalfail;
571
374
}
572
375
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
573
if(ret != GNUTLS_E_SUCCESS){
574
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
575
safer_gnutls_strerror(ret));
376
if (ret != GNUTLS_E_SUCCESS) {
377
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
378
safer_gnutls_strerror(ret));
576
379
goto globalfail;
577
380
}
578
381
579
382
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
580
383
581
384
return 0;
582
385
583
386
globalfail:
584
387
585
388
gnutls_certificate_free_credentials(mc->cred);
586
389
gnutls_global_deinit();
587
gnutls_dh_params_deinit(mc->dh_params);
588
390
return -1;
391
589
392
}
590
393
591
__attribute__((nonnull, warn_unused_result))
592
static int init_gnutls_session(gnutls_session_t *session,
593
mandos_context *mc){
394
static int init_gnutls_session(mandos_context *mc,
395
gnutls_session_t *session){
594
396
int ret;
595
397
/* GnuTLS session creation */
596
do {
597
ret = gnutls_init(session, GNUTLS_SERVER);
598
if(quit_now){
599
return -1;
600
}
601
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
602
if(ret != GNUTLS_E_SUCCESS){
603
fprintf_plus(stderr,
604
"Error in GnuTLS session initialization: %s\n",
605
safer_gnutls_strerror(ret));
398
ret = gnutls_init(session, GNUTLS_SERVER);
399
if (ret != GNUTLS_E_SUCCESS){
400
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
401
safer_gnutls_strerror(ret));
606
402
}
607
403
608
404
{
609
405
const char *err;
610
do {
611
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
612
if(quit_now){
613
gnutls_deinit(*session);
614
return -1;
615
}
616
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
617
if(ret != GNUTLS_E_SUCCESS){
618
fprintf_plus(stderr, "Syntax error at: %s\n", err);
619
fprintf_plus(stderr, "GnuTLS error: %s\n",
620
safer_gnutls_strerror(ret));
621
gnutls_deinit(*session);
406
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
407
if (ret != GNUTLS_E_SUCCESS) {
408
fprintf(stderr, "Syntax error at: %s\n", err);
409
fprintf(stderr, "GnuTLS error: %s\n",
410
safer_gnutls_strerror(ret));
411
gnutls_deinit (*session);
622
412
return -1;
623
413
}
624
414
}
625
415
626
do {
627
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
628
mc->cred);
629
if(quit_now){
630
gnutls_deinit(*session);
631
return -1;
632
}
633
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
634
if(ret != GNUTLS_E_SUCCESS){
635
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
636
safer_gnutls_strerror(ret));
637
gnutls_deinit(*session);
416
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
417
mc->cred);
418
if (ret != GNUTLS_E_SUCCESS) {
419
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
420
safer_gnutls_strerror(ret));
421
gnutls_deinit (*session);
638
422
return -1;
639
423
}
640
424
641
425
/* ignore client certificate if any. */
642
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
426
gnutls_certificate_server_set_request (*session,
427
GNUTLS_CERT_IGNORE);
643
428
644
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
429
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
645
430
646
431
return 0;
647
432
}
651
436
__attribute__((unused)) const char *txt){}
652
437
653
438
/* Called when a Mandos server is found */
654
__attribute__((nonnull, warn_unused_result))
655
static int start_mandos_communication(const char *ip, in_port_t port,
439
static int start_mandos_communication(const char *ip, uint16_t port,
656
440
AvahiIfIndex if_index,
657
int af, mandos_context *mc){
658
int ret, tcp_sd = -1;
659
ssize_t sret;
660
struct sockaddr_storage to;
441
mandos_context *mc){
442
int ret, tcp_sd;
443
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
661
444
char *buffer = NULL;
662
char *decrypted_buffer = NULL;
445
char *decrypted_buffer;
663
446
size_t buffer_length = 0;
664
447
size_t buffer_capacity = 0;
448
ssize_t decrypted_buffer_size;
665
449
size_t written;
666
int retval = -1;
450
int retval = 0;
451
char interface[IF_NAMESIZE];
667
452
gnutls_session_t session;
668
int pf; /* Protocol family */
669
670
errno = 0;
671
672
if(quit_now){
673
errno = EINTR;
674
return -1;
675
}
676
677
switch(af){
678
case AF_INET6:
679
pf = PF_INET6;
680
break;
681
case AF_INET:
682
pf = PF_INET;
683
break;
684
default:
685
fprintf_plus(stderr, "Bad address family: %d\n", af);
686
errno = EINVAL;
687
return -1;
688
}
689
690
/* If the interface is specified and we have a list of interfaces */
691
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
692
/* Check if the interface is one of the interfaces we are using */
693
bool match = false;
694
{
695
char *interface = NULL;
696
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
697
interface))){
698
if(if_nametoindex(interface) == (unsigned int)if_index){
699
match = true;
700
break;
701
}
702
}
703
}
704
if(not match){
705
/* This interface does not match any in the list, so we don't
706
connect to the server */
707
if(debug){
708
char interface[IF_NAMESIZE];
709
if(if_indextoname((unsigned int)if_index, interface) == NULL){
710
perror_plus("if_indextoname");
711
} else {
712
fprintf_plus(stderr, "Skipping server on non-used interface"
713
" \"%s\"\n",
714
if_indextoname((unsigned int)if_index,
715
interface));
716
}
717
}
453
454
ret = init_gnutls_session (mc, &session);
455
if (ret != 0){
456
return -1;
457
}
458
459
if(debug){
460
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
461
"\n", ip, port);
462
}
463
464
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
465
if(tcp_sd < 0) {
466
perror("socket");
467
return -1;
468
}
469
470
if(debug){
471
if(if_indextoname((unsigned int)if_index, interface) == NULL){
472
perror("if_indextoname");
718
473
return -1;
719
474
}
720
}
721
722
ret = init_gnutls_session(&session, mc);
723
if(ret != 0){
724
return -1;
725
}
726
727
if(debug){
728
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
729
PRIuMAX "\n", ip, (uintmax_t)port);
730
}
731
732
tcp_sd = socket(pf, SOCK_STREAM, 0);
733
if(tcp_sd < 0){
734
int e = errno;
735
perror_plus("socket");
736
errno = e;
737
goto mandos_end;
738
}
739
740
if(quit_now){
741
errno = EINTR;
742
goto mandos_end;
475
fprintf(stderr, "Binding to interface %s\n", interface);
743
476
}
744
477
745
478
memset(&to, 0, sizeof(to));
746
if(af == AF_INET6){
747
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
748
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
749
} else { /* IPv4 */
750
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
751
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
752
}
753
if(ret < 0 ){
754
int e = errno;
755
perror_plus("inet_pton");
756
errno = e;
757
goto mandos_end;
479
to.in6.sin6_family = AF_INET6;
480
/* It would be nice to have a way to detect if we were passed an
481
IPv4 address here. Now we assume an IPv6 address. */
482
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
483
if (ret < 0 ){
484
perror("inet_pton");
485
return -1;
758
486
}
759
487
if(ret == 0){
760
int e = errno;
761
fprintf_plus(stderr, "Bad address: %s\n", ip);
762
errno = e;
763
goto mandos_end;
764
}
765
if(af == AF_INET6){
766
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
767
if(IN6_IS_ADDR_LINKLOCAL
768
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
769
if(if_index == AVAHI_IF_UNSPEC){
770
fprintf_plus(stderr, "An IPv6 link-local address is"
771
" incomplete without a network interface\n");
772
errno = EINVAL;
773
goto mandos_end;
774
}
775
/* Set the network interface number as scope */
776
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
777
}
778
} else {
779
((struct sockaddr_in *)&to)->sin_port = htons(port);
780
}
488
fprintf(stderr, "Bad address: %s\n", ip);
489
return -1;
490
}
491
to.in6.sin6_port = htons(port); /* Spurious warning */
781
492
782
if(quit_now){
783
errno = EINTR;
784
goto mandos_end;
785
}
493
to.in6.sin6_scope_id = (uint32_t)if_index;
786
494
787
495
if(debug){
788
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
789
char interface[IF_NAMESIZE];
790
if(if_indextoname((unsigned int)if_index, interface) == NULL){
791
perror_plus("if_indextoname");
792
} else {
793
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
794
"\n", ip, interface, (uintmax_t)port);
496
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
497
port);
498
char addrstr[INET6_ADDRSTRLEN] = "";
499
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
500
sizeof(addrstr)) == NULL){
501
perror("inet_ntop");
502
} else {
503
if(strcmp(addrstr, ip) != 0){
504
fprintf(stderr, "Canonical address form: %s\n", addrstr);
795
505
}
796
} else {
797
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
798
ip, (uintmax_t)port);
799
}
800
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
801
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
802
if(af == AF_INET6){
803
ret = getnameinfo((struct sockaddr *)&to,
804
sizeof(struct sockaddr_in6),
805
addrstr, sizeof(addrstr), NULL, 0,
806
NI_NUMERICHOST);
807
} else {
808
ret = getnameinfo((struct sockaddr *)&to,
809
sizeof(struct sockaddr_in),
810
addrstr, sizeof(addrstr), NULL, 0,
811
NI_NUMERICHOST);
812
}
813
if(ret == EAI_SYSTEM){
814
perror_plus("getnameinfo");
815
} else if(ret != 0) {
816
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
817
} else if(strcmp(addrstr, ip) != 0){
818
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
819
}
820
}
821
822
if(quit_now){
823
errno = EINTR;
824
goto mandos_end;
825
}
826
827
if(af == AF_INET6){
828
ret = connect(tcp_sd, (struct sockaddr *)&to,
829
sizeof(struct sockaddr_in6));
830
} else {
831
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
832
sizeof(struct sockaddr_in));
833
}
834
if(ret < 0){
835
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
836
int e = errno;
837
perror_plus("connect");
838
errno = e;
839
}
840
goto mandos_end;
841
}
842
843
if(quit_now){
844
errno = EINTR;
845
goto mandos_end;
846
}
847
506
}
507
}
508
509
ret = connect(tcp_sd, &to.in, sizeof(to));
510
if (ret < 0){
511
perror("connect");
512
return -1;
513
}
514
848
515
const char *out = mandos_protocol_version;
849
516
written = 0;
850
while(true){
517
while (true){
851
518
size_t out_size = strlen(out);
852
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
853
out_size - written));
854
if(ret == -1){
855
int e = errno;
856
perror_plus("write");
857
errno = e;
519
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
520
out_size - written));
521
if (ret == -1){
522
perror("write");
523
retval = -1;
858
524
goto mandos_end;
859
525
}
860
526
written += (size_t)ret;
861
527
if(written < out_size){
862
528
continue;
863
529
} else {
864
if(out == mandos_protocol_version){
530
if (out == mandos_protocol_version){
865
531
written = 0;
866
532
out = "\r\n";
867
533
} else {
868
534
break;
869
535
}
870
536
}
871
872
if(quit_now){
873
errno = EINTR;
874
goto mandos_end;
875
}
876
537
}
877
538
878
539
if(debug){
879
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
880
}
881
882
if(quit_now){
883
errno = EINTR;
884
goto mandos_end;
885
}
886
887
/* This casting via intptr_t is to eliminate warning about casting
888
an int to a pointer type. This is exactly how the GnuTLS Guile
889
function "set-session-transport-fd!" does it. */
890
gnutls_transport_set_ptr(session,
891
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
892
893
if(quit_now){
894
errno = EINTR;
895
goto mandos_end;
896
}
897
898
do {
899
ret = gnutls_handshake(session);
900
if(quit_now){
901
errno = EINTR;
902
goto mandos_end;
903
}
540
fprintf(stderr, "Establishing TLS session with %s\n", ip);
541
}
542
543
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
544
545
do{
546
ret = gnutls_handshake (session);
904
547
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
905
548
906
if(ret != GNUTLS_E_SUCCESS){
549
if (ret != GNUTLS_E_SUCCESS){
907
550
if(debug){
908
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
909
gnutls_perror(ret);
551
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
552
gnutls_perror (ret);
910
553
}
911
errno = EPROTO;
554
retval = -1;
912
555
goto mandos_end;
913
556
}
914
557
915
558
/* Read OpenPGP packet that contains the wanted password */
916
559
917
560
if(debug){
918
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
919
" %s\n", ip);
561
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
562
ip);
920
563
}
921
564
922
565
while(true){
923
924
if(quit_now){
925
errno = EINTR;
926
goto mandos_end;
927
}
928
929
buffer_capacity = incbuffer(&buffer, buffer_length,
930
buffer_capacity);
931
if(buffer_capacity == 0){
932
int e = errno;
933
perror_plus("incbuffer");
934
errno = e;
935
goto mandos_end;
936
}
937
938
if(quit_now){
939
errno = EINTR;
940
goto mandos_end;
941
}
942
943
sret = gnutls_record_recv(session, buffer+buffer_length,
944
BUFFER_SIZE);
945
if(sret == 0){
566
buffer_capacity = adjustbuffer(&buffer, buffer_length,
567
buffer_capacity);
568
if (buffer_capacity == 0){
569
perror("adjustbuffer");
570
retval = -1;
571
goto mandos_end;
572
}
573
574
ret = gnutls_record_recv(session, buffer+buffer_length,
575
BUFFER_SIZE);
576
if (ret == 0){
946
577
break;
947
578
}
948
if(sret < 0){
949
switch(sret){
579
if (ret < 0){
580
switch(ret){
950
581
case GNUTLS_E_INTERRUPTED:
951
582
case GNUTLS_E_AGAIN:
952
583
break;
953
584
case GNUTLS_E_REHANDSHAKE:
954
do {
955
ret = gnutls_handshake(session);
956
957
if(quit_now){
958
errno = EINTR;
959
goto mandos_end;
960
}
585
do{
586
ret = gnutls_handshake (session);
961
587
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
962
if(ret < 0){
963
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
964
"***\n");
965
gnutls_perror(ret);
966
errno = EPROTO;
588
if (ret < 0){
589
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
590
gnutls_perror (ret);
591
retval = -1;
967
592
goto mandos_end;
968
593
}
969
594
break;
970
595
default:
971
fprintf_plus(stderr, "Unknown error while reading data from"
972
" encrypted session with Mandos server\n");
973
gnutls_bye(session, GNUTLS_SHUT_RDWR);
974
errno = EIO;
596
fprintf(stderr, "Unknown error while reading data from"
597
" encrypted session with Mandos server\n");
598
retval = -1;
599
gnutls_bye (session, GNUTLS_SHUT_RDWR);
975
600
goto mandos_end;
976
601
}
977
602
} else {
978
buffer_length += (size_t) sret;
603
buffer_length += (size_t) ret;
979
604
}
980
605
}
981
606
982
607
if(debug){
983
fprintf_plus(stderr, "Closing TLS session\n");
984
}
985
986
if(quit_now){
987
errno = EINTR;
988
goto mandos_end;
989
}
990
991
do {
992
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
993
if(quit_now){
994
errno = EINTR;
995
goto mandos_end;
996
}
997
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
998
999
if(buffer_length > 0){
1000
ssize_t decrypted_buffer_size;
1001
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1002
&decrypted_buffer, mc);
1003
if(decrypted_buffer_size >= 0){
1004
608
fprintf(stderr, "Closing TLS session\n");
609
}
610
611
gnutls_bye (session, GNUTLS_SHUT_RDWR);
612
613
if (buffer_length > 0){
614
decrypted_buffer_size = pgp_packet_decrypt(buffer,
615
buffer_length,
616
&decrypted_buffer,
617
keydir);
618
if (decrypted_buffer_size >= 0){
1005
619
written = 0;
1006
620
while(written < (size_t) decrypted_buffer_size){
1007
if(quit_now){
1008
errno = EINTR;
1009
goto mandos_end;
1010
}
1011
1012
ret = (int)fwrite(decrypted_buffer + written, 1,
1013
(size_t)decrypted_buffer_size - written,
1014
stdout);
621
ret = (int)fwrite (decrypted_buffer + written, 1,
622
(size_t)decrypted_buffer_size - written,
623
stdout);
1015
624
if(ret == 0 and ferror(stdout)){
1016
int e = errno;
1017
625
if(debug){
1018
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1019
strerror(errno));
626
fprintf(stderr, "Error writing encrypted data: %s\n",
627
strerror(errno));
1020
628
}
1021
errno = e;
1022
goto mandos_end;
629
retval = -1;
630
break;
1023
631
}
1024
632
written += (size_t)ret;
1025
633
}
1026
retval = 0;
634
free(decrypted_buffer);
635
} else {
636
retval = -1;
1027
637
}
638
} else {
639
retval = -1;
1028
640
}
1029
641
1030
642
/* Shutdown procedure */
1031
643
1032
644
mandos_end:
1033
{
1034
int e = errno;
1035
free(decrypted_buffer);
1036
free(buffer);
1037
if(tcp_sd >= 0){
1038
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1039
}
1040
if(ret == -1){
1041
if(e == 0){
1042
e = errno;
1043
}
1044
perror_plus("close");
1045
}
1046
gnutls_deinit(session);
1047
errno = e;
1048
if(quit_now){
1049
errno = EINTR;
1050
retval = -1;
1051
}
1052
}
645
free(buffer);
646
close(tcp_sd);
647
gnutls_deinit (session);
1053
648
return retval;
1054
649
}
1055
650
1056
__attribute__((nonnull))
1057
651
static void resolve_callback(AvahiSServiceResolver *r,
1058
652
AvahiIfIndex interface,
1059
AvahiProtocol proto,
653
AVAHI_GCC_UNUSED AvahiProtocol protocol,
1060
654
AvahiResolverEvent event,
1061
655
const char *name,
1062
656
const char *type,
1067
661
AVAHI_GCC_UNUSED AvahiStringList *txt,
1068
662
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1069
663
flags,
1070
void *mc){
1071
if(r == NULL){
1072
return;
1073
}
664
void* userdata) {
665
mandos_context *mc = userdata;
666
assert(r);
1074
667
1075
668
/* Called whenever a service has been resolved successfully or
1076
669
timed out */
1077
670
1078
if(quit_now){
1079
avahi_s_service_resolver_free(r);
1080
return;
1081
}
1082
1083
switch(event){
671
switch (event) {
1084
672
default:
1085
673
case AVAHI_RESOLVER_FAILURE:
1086
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1087
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1088
domain,
1089
avahi_strerror(avahi_server_errno
1090
(((mandos_context*)mc)->server)));
674
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
675
" of type '%s' in domain '%s': %s\n", name, type, domain,
676
avahi_strerror(avahi_server_errno(mc->server)));
1091
677
break;
1092
678
1093
679
case AVAHI_RESOLVER_FOUND:
1095
681
char ip[AVAHI_ADDRESS_STR_MAX];
1096
682
avahi_address_snprint(ip, sizeof(ip), address);
1097
683
if(debug){
1098
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1099
PRIdMAX ") on port %" PRIu16 "\n", name,
1100
host_name, ip, (intmax_t)interface, port);
684
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
685
PRIu16 ") on port %d\n", name, host_name, ip,
686
interface, port);
1101
687
}
1102
int ret = start_mandos_communication(ip, (in_port_t)port,
1103
interface,
1104
avahi_proto_to_af(proto),
1105
mc);
1106
if(ret == 0){
1107
avahi_simple_poll_quit(simple_poll);
1108
} else {
1109
if(not add_server(ip, (in_port_t)port, interface,
1110
avahi_proto_to_af(proto),
1111
&((mandos_context*)mc)->current_server)){
1112
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1113
" list\n", name);
1114
}
688
int ret = start_mandos_communication(ip, port, interface, mc);
689
if (ret == 0){
690
avahi_simple_poll_quit(mc->simple_poll);
1115
691
}
1116
692
}
1117
693
}
1118
694
avahi_s_service_resolver_free(r);
1119
695
}
1120
696
1121
static void browse_callback(AvahiSServiceBrowser *b,
1122
AvahiIfIndex interface,
1123
AvahiProtocol protocol,
1124
AvahiBrowserEvent event,
1125
const char *name,
1126
const char *type,
1127
const char *domain,
1128
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1129
flags,
1130
void *mc){
1131
if(b == NULL){
1132
return;
1133
}
697
static void browse_callback( AvahiSServiceBrowser *b,
698
AvahiIfIndex interface,
699
AvahiProtocol protocol,
700
AvahiBrowserEvent event,
701
const char *name,
702
const char *type,
703
const char *domain,
704
AVAHI_GCC_UNUSED AvahiLookupResultFlags
705
flags,
706
void* userdata) {
707
mandos_context *mc = userdata;
708
assert(b);
1134
709
1135
710
/* Called whenever a new services becomes available on the LAN or
1136
711
is removed from the LAN */
1137
712
1138
if(quit_now){
1139
return;
1140
}
1141
1142
switch(event){
713
switch (event) {
1143
714
default:
1144
715
case AVAHI_BROWSER_FAILURE:
1145
716
1146
fprintf_plus(stderr, "(Avahi browser) %s\n",
1147
avahi_strerror(avahi_server_errno
1148
(((mandos_context*)mc)->server)));
1149
avahi_simple_poll_quit(simple_poll);
717
fprintf(stderr, "(Avahi browser) %s\n",
718
avahi_strerror(avahi_server_errno(mc->server)));
719
avahi_simple_poll_quit(mc->simple_poll);
1150
720
return;
1151
721
1152
722
case AVAHI_BROWSER_NEW:
1155
725
the callback function is called the Avahi server will free the
1156
726
resolver for us. */
1157
727
1158
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1159
interface, protocol, name, type,
1160
domain, protocol, 0,
1161
resolve_callback, mc) == NULL)
1162
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1163
" %s\n", name,
1164
avahi_strerror(avahi_server_errno
1165
(((mandos_context*)mc)->server)));
728
if (!(avahi_s_service_resolver_new(mc->server, interface,
729
protocol, name, type, domain,
730
AVAHI_PROTO_INET6, 0,
731
resolve_callback, mc)))
732
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
733
name, avahi_strerror(avahi_server_errno(mc->server)));
1166
734
break;
1167
735
1168
736
case AVAHI_BROWSER_REMOVE:
1171
739
case AVAHI_BROWSER_ALL_FOR_NOW:
1172
740
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1173
741
if(debug){
1174
fprintf_plus(stderr, "No Mandos server found, still"
1175
" searching...\n");
742
fprintf(stderr, "No Mandos server found, still searching...\n");
1176
743
}
1177
744
break;
1178
745
}
1179
746
}
1180
747
1181
/* Signal handler that stops main loop after SIGTERM */
1182
static void handle_sigterm(int sig){
1183
if(quit_now){
1184
return;
1185
}
1186
quit_now = 1;
1187
signal_received = sig;
1188
int old_errno = errno;
1189
/* set main loop to exit */
1190
if(simple_poll != NULL){
1191
avahi_simple_poll_quit(simple_poll);
1192
}
1193
errno = old_errno;
1194
}
1195
1196
__attribute__((nonnull, warn_unused_result))
1197
bool get_flags(const char *ifname, struct ifreq *ifr){
1198
int ret;
1199
error_t ret_errno;
1200
1201
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1202
if(s < 0){
1203
ret_errno = errno;
1204
perror_plus("socket");
1205
errno = ret_errno;
1206
return false;
1207
}
1208
strcpy(ifr->ifr_name, ifname);
1209
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1210
if(ret == -1){
1211
if(debug){
1212
ret_errno = errno;
1213
perror_plus("ioctl SIOCGIFFLAGS");
1214
errno = ret_errno;
1215
}
1216
return false;
1217
}
1218
return true;
1219
}
1220
1221
__attribute__((nonnull, warn_unused_result))
1222
bool good_flags(const char *ifname, const struct ifreq *ifr){
1223
1224
/* Reject the loopback device */
1225
if(ifr->ifr_flags & IFF_LOOPBACK){
1226
if(debug){
1227
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1228
ifname);
1229
}
1230
return false;
1231
}
1232
/* Accept point-to-point devices only if connect_to is specified */
1233
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1234
if(debug){
1235
fprintf_plus(stderr, "Accepting point-to-point interface"
1236
" \"%s\"\n", ifname);
1237
}
1238
return true;
1239
}
1240
/* Otherwise, reject non-broadcast-capable devices */
1241
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1242
if(debug){
1243
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1244
" \"%s\"\n", ifname);
1245
}
1246
return false;
1247
}
1248
/* Reject non-ARP interfaces (including dummy interfaces) */
1249
if(ifr->ifr_flags & IFF_NOARP){
1250
if(debug){
1251
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1252
ifname);
1253
}
1254
return false;
1255
}
1256
1257
/* Accept this device */
1258
if(debug){
1259
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1260
}
1261
return true;
1262
}
1263
1264
/*
1265
* This function determines if a directory entry in /sys/class/net
1266
* corresponds to an acceptable network device.
1267
* (This function is passed to scandir(3) as a filter function.)
1268
*/
1269
__attribute__((nonnull, warn_unused_result))
1270
int good_interface(const struct dirent *if_entry){
1271
if(if_entry->d_name[0] == '.'){
1272
return 0;
1273
}
1274
1275
struct ifreq ifr;
1276
if(not get_flags(if_entry->d_name, &ifr)){
1277
if(debug){
1278
fprintf_plus(stderr, "Failed to get flags for interface "
1279
"\"%s\"\n", if_entry->d_name);
1280
}
1281
return 0;
1282
}
1283
1284
if(not good_flags(if_entry->d_name, &ifr)){
1285
return 0;
1286
}
1287
return 1;
1288
}
1289
1290
/*
1291
* This function determines if a network interface is up.
1292
*/
1293
__attribute__((nonnull, warn_unused_result))
1294
bool interface_is_up(const char *interface){
1295
struct ifreq ifr;
1296
if(not get_flags(interface, &ifr)){
1297
if(debug){
1298
fprintf_plus(stderr, "Failed to get flags for interface "
1299
"\"%s\"\n", interface);
1300
}
1301
return false;
1302
}
1303
1304
return (bool)(ifr.ifr_flags & IFF_UP);
1305
}
1306
1307
/*
1308
* This function determines if a network interface is running
1309
*/
1310
__attribute__((nonnull, warn_unused_result))
1311
bool interface_is_running(const char *interface){
1312
struct ifreq ifr;
1313
if(not get_flags(interface, &ifr)){
1314
if(debug){
1315
fprintf_plus(stderr, "Failed to get flags for interface "
1316
"\"%s\"\n", interface);
1317
}
1318
return false;
1319
}
1320
1321
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1322
}
1323
1324
__attribute__((nonnull, pure, warn_unused_result))
1325
int notdotentries(const struct dirent *direntry){
1326
/* Skip "." and ".." */
1327
if(direntry->d_name[0] == '.'
1328
and (direntry->d_name[1] == '\0'
1329
or (direntry->d_name[1] == '.'
1330
and direntry->d_name[2] == '\0'))){
1331
return 0;
1332
}
1333
return 1;
1334
}
1335
1336
/* Is this directory entry a runnable program? */
1337
__attribute__((nonnull, warn_unused_result))
1338
int runnable_hook(const struct dirent *direntry){
1339
int ret;
1340
size_t sret;
1341
struct stat st;
1342
1343
if((direntry->d_name)[0] == '\0'){
1344
/* Empty name? */
1345
return 0;
1346
}
1347
1348
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1349
"abcdefghijklmnopqrstuvwxyz"
1350
"0123456789"
1351
"_.-");
1352
if((direntry->d_name)[sret] != '\0'){
1353
/* Contains non-allowed characters */
1354
if(debug){
1355
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1356
direntry->d_name);
1357
}
1358
return 0;
1359
}
1360
1361
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1362
if(ret == -1){
1363
if(debug){
1364
perror_plus("Could not stat hook");
1365
}
1366
return 0;
1367
}
1368
if(not (S_ISREG(st.st_mode))){
1369
/* Not a regular file */
1370
if(debug){
1371
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1372
direntry->d_name);
1373
}
1374
return 0;
1375
}
1376
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1377
/* Not executable */
1378
if(debug){
1379
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1380
direntry->d_name);
1381
}
1382
return 0;
1383
}
1384
if(debug){
1385
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1386
direntry->d_name);
1387
}
1388
return 1;
1389
}
1390
1391
__attribute__((nonnull, warn_unused_result))
1392
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1393
mandos_context *mc){
1394
int ret;
1395
struct timespec now;
1396
struct timespec waited_time;
1397
intmax_t block_time;
1398
1399
while(true){
1400
if(mc->current_server == NULL){
1401
if(debug){
1402
fprintf_plus(stderr, "Wait until first server is found."
1403
" No timeout!\n");
1404
}
1405
ret = avahi_simple_poll_iterate(s, -1);
1406
} else {
1407
if(debug){
1408
fprintf_plus(stderr, "Check current_server if we should run"
1409
" it, or wait\n");
1410
}
1411
/* the current time */
1412
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1413
if(ret == -1){
1414
perror_plus("clock_gettime");
1415
return -1;
1416
}
1417
/* Calculating in ms how long time between now and server
1418
who we visted longest time ago. Now - last seen. */
1419
waited_time.tv_sec = (now.tv_sec
1420
- mc->current_server->last_seen.tv_sec);
1421
waited_time.tv_nsec = (now.tv_nsec
1422
- mc->current_server->last_seen.tv_nsec);
1423
/* total time is 10s/10,000ms.
1424
Converting to s from ms by dividing by 1,000,
1425
and ns to ms by dividing by 1,000,000. */
1426
block_time = ((retry_interval
1427
- ((intmax_t)waited_time.tv_sec * 1000))
1428
- ((intmax_t)waited_time.tv_nsec / 1000000));
1429
1430
if(debug){
1431
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1432
block_time);
1433
}
1434
1435
if(block_time <= 0){
1436
ret = start_mandos_communication(mc->current_server->ip,
1437
mc->current_server->port,
1438
mc->current_server->if_index,
1439
mc->current_server->af, mc);
1440
if(ret == 0){
1441
avahi_simple_poll_quit(s);
1442
return 0;
1443
}
1444
ret = clock_gettime(CLOCK_MONOTONIC,
1445
&mc->current_server->last_seen);
1446
if(ret == -1){
1447
perror_plus("clock_gettime");
1448
return -1;
1449
}
1450
mc->current_server = mc->current_server->next;
1451
block_time = 0; /* Call avahi to find new Mandos
1452
servers, but don't block */
1453
}
1454
1455
ret = avahi_simple_poll_iterate(s, (int)block_time);
1456
}
1457
if(ret != 0){
1458
if(ret > 0 or errno != EINTR){
1459
return (ret != 1) ? ret : 0;
1460
}
1461
}
1462
}
1463
}
1464
1465
/* Set effective uid to 0, return errno */
1466
__attribute__((warn_unused_result))
1467
error_t raise_privileges(void){
1468
error_t old_errno = errno;
1469
error_t ret_errno = 0;
1470
if(seteuid(0) == -1){
1471
ret_errno = errno;
1472
}
1473
errno = old_errno;
1474
return ret_errno;
1475
}
1476
1477
/* Set effective and real user ID to 0. Return errno. */
1478
__attribute__((warn_unused_result))
1479
error_t raise_privileges_permanently(void){
1480
error_t old_errno = errno;
1481
error_t ret_errno = raise_privileges();
1482
if(ret_errno != 0){
1483
errno = old_errno;
1484
return ret_errno;
1485
}
1486
if(setuid(0) == -1){
1487
ret_errno = errno;
1488
}
1489
errno = old_errno;
1490
return ret_errno;
1491
}
1492
1493
/* Set effective user ID to unprivileged saved user ID */
1494
__attribute__((warn_unused_result))
1495
error_t lower_privileges(void){
1496
error_t old_errno = errno;
1497
error_t ret_errno = 0;
1498
if(seteuid(uid) == -1){
1499
ret_errno = errno;
1500
}
1501
errno = old_errno;
1502
return ret_errno;
1503
}
1504
1505
/* Lower privileges permanently */
1506
__attribute__((warn_unused_result))
1507
error_t lower_privileges_permanently(void){
1508
error_t old_errno = errno;
1509
error_t ret_errno = 0;
1510
if(setuid(uid) == -1){
1511
ret_errno = errno;
1512
}
1513
errno = old_errno;
1514
return ret_errno;
1515
}
1516
1517
__attribute__((nonnull))
1518
void run_network_hooks(const char *mode, const char *interface,
1519
const float delay){
1520
struct dirent **direntries = NULL;
1521
if(hookdir_fd == -1){
1522
hookdir_fd = open(hookdir, O_RDONLY);
1523
if(hookdir_fd == -1){
1524
if(errno == ENOENT){
1525
if(debug){
1526
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1527
" found\n", hookdir);
1528
}
1529
} else {
1530
perror_plus("open");
1531
}
1532
return;
1533
}
1534
}
1535
#ifdef __GLIBC__
1536
#if __GLIBC_PREREQ(2, 15)
1537
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1538
runnable_hook, alphasort);
1539
#else /* not __GLIBC_PREREQ(2, 15) */
1540
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1541
alphasort);
1542
#endif /* not __GLIBC_PREREQ(2, 15) */
1543
#else /* not __GLIBC__ */
1544
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1545
alphasort);
1546
#endif /* not __GLIBC__ */
1547
if(numhooks == -1){
1548
perror_plus("scandir");
1549
return;
1550
}
1551
struct dirent *direntry;
1552
int ret;
1553
int devnull = open("/dev/null", O_RDONLY);
1554
for(int i = 0; i < numhooks; i++){
1555
direntry = direntries[i];
1556
if(debug){
1557
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1558
direntry->d_name);
1559
}
1560
pid_t hook_pid = fork();
1561
if(hook_pid == 0){
1562
/* Child */
1563
/* Raise privileges */
1564
errno = raise_privileges_permanently();
1565
if(errno != 0){
1566
perror_plus("Failed to raise privileges");
1567
_exit(EX_NOPERM);
1568
}
1569
/* Set group */
1570
errno = 0;
1571
ret = setgid(0);
1572
if(ret == -1){
1573
perror_plus("setgid");
1574
_exit(EX_NOPERM);
1575
}
1576
/* Reset supplementary groups */
1577
errno = 0;
1578
ret = setgroups(0, NULL);
1579
if(ret == -1){
1580
perror_plus("setgroups");
1581
_exit(EX_NOPERM);
1582
}
1583
ret = dup2(devnull, STDIN_FILENO);
1584
if(ret == -1){
1585
perror_plus("dup2(devnull, STDIN_FILENO)");
1586
_exit(EX_OSERR);
1587
}
1588
ret = close(devnull);
1589
if(ret == -1){
1590
perror_plus("close");
1591
_exit(EX_OSERR);
1592
}
1593
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1594
if(ret == -1){
1595
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1596
_exit(EX_OSERR);
1597
}
1598
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1599
if(ret == -1){
1600
perror_plus("setenv");
1601
_exit(EX_OSERR);
1602
}
1603
ret = setenv("DEVICE", interface, 1);
1604
if(ret == -1){
1605
perror_plus("setenv");
1606
_exit(EX_OSERR);
1607
}
1608
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1609
if(ret == -1){
1610
perror_plus("setenv");
1611
_exit(EX_OSERR);
1612
}
1613
ret = setenv("MODE", mode, 1);
1614
if(ret == -1){
1615
perror_plus("setenv");
1616
_exit(EX_OSERR);
1617
}
1618
char *delaystring;
1619
ret = asprintf(&delaystring, "%f", (double)delay);
1620
if(ret == -1){
1621
perror_plus("asprintf");
1622
_exit(EX_OSERR);
1623
}
1624
ret = setenv("DELAY", delaystring, 1);
1625
if(ret == -1){
1626
free(delaystring);
1627
perror_plus("setenv");
1628
_exit(EX_OSERR);
1629
}
1630
free(delaystring);
1631
if(connect_to != NULL){
1632
ret = setenv("CONNECT", connect_to, 1);
1633
if(ret == -1){
1634
perror_plus("setenv");
1635
_exit(EX_OSERR);
1636
}
1637
}
1638
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
1639
if(hook_fd == -1){
1640
perror_plus("openat");
1641
_exit(EXIT_FAILURE);
1642
}
1643
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1644
perror_plus("close");
1645
_exit(EXIT_FAILURE);
1646
}
1647
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1648
environ) == -1){
1649
perror_plus("fexecve");
1650
_exit(EXIT_FAILURE);
1651
}
1652
} else {
1653
if(hook_pid == -1){
1654
perror_plus("fork");
1655
free(direntry);
1656
continue;
1657
}
1658
int status;
1659
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1660
perror_plus("waitpid");
1661
free(direntry);
1662
continue;
1663
}
1664
if(WIFEXITED(status)){
1665
if(WEXITSTATUS(status) != 0){
1666
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1667
" with status %d\n", direntry->d_name,
1668
WEXITSTATUS(status));
1669
free(direntry);
1670
continue;
1671
}
1672
} else if(WIFSIGNALED(status)){
1673
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1674
" signal %d\n", direntry->d_name,
1675
WTERMSIG(status));
1676
free(direntry);
1677
continue;
1678
} else {
1679
fprintf_plus(stderr, "Warning: network hook \"%s\""
1680
" crashed\n", direntry->d_name);
1681
free(direntry);
1682
continue;
1683
}
1684
}
1685
if(debug){
1686
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1687
direntry->d_name);
1688
}
1689
free(direntry);
1690
}
1691
free(direntries);
1692
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1693
perror_plus("close");
1694
} else {
1695
hookdir_fd = -1;
1696
}
1697
close(devnull);
1698
}
1699
1700
__attribute__((nonnull, warn_unused_result))
1701
error_t bring_up_interface(const char *const interface,
1702
const float delay){
1703
error_t old_errno = errno;
1704
int ret;
1705
struct ifreq network;
1706
unsigned int if_index = if_nametoindex(interface);
1707
if(if_index == 0){
1708
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1709
errno = old_errno;
1710
return ENXIO;
1711
}
1712
1713
if(quit_now){
1714
errno = old_errno;
1715
return EINTR;
1716
}
1717
1718
if(not interface_is_up(interface)){
1719
error_t ret_errno = 0, ioctl_errno = 0;
1720
if(not get_flags(interface, &network)){
1721
ret_errno = errno;
1722
fprintf_plus(stderr, "Failed to get flags for interface "
1723
"\"%s\"\n", interface);
1724
errno = old_errno;
1725
return ret_errno;
1726
}
1727
network.ifr_flags |= IFF_UP; /* set flag */
1728
1729
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1730
if(sd == -1){
1731
ret_errno = errno;
1732
perror_plus("socket");
1733
errno = old_errno;
1734
return ret_errno;
1735
}
1736
1737
if(quit_now){
1738
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1739
if(ret == -1){
1740
perror_plus("close");
1741
}
1742
errno = old_errno;
1743
return EINTR;
1744
}
1745
1746
if(debug){
1747
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1748
interface);
1749
}
1750
1751
/* Raise privileges */
1752
ret_errno = raise_privileges();
1753
if(ret_errno != 0){
1754
errno = ret_errno;
1755
perror_plus("Failed to raise privileges");
1756
}
1757
1758
#ifdef __linux__
1759
int ret_linux;
1760
bool restore_loglevel = false;
1761
if(ret_errno == 0){
1762
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1763
messages about the network interface to mess up the prompt */
1764
ret_linux = klogctl(8, NULL, 5);
1765
if(ret_linux == -1){
1766
perror_plus("klogctl");
1767
} else {
1768
restore_loglevel = true;
1769
}
1770
}
1771
#endif /* __linux__ */
1772
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1773
ioctl_errno = errno;
1774
#ifdef __linux__
1775
if(restore_loglevel){
1776
ret_linux = klogctl(7, NULL, 0);
1777
if(ret_linux == -1){
1778
perror_plus("klogctl");
1779
}
1780
}
1781
#endif /* __linux__ */
1782
1783
/* If raise_privileges() succeeded above */
1784
if(ret_errno == 0){
1785
/* Lower privileges */
1786
ret_errno = lower_privileges();
1787
if(ret_errno != 0){
1788
errno = ret_errno;
1789
perror_plus("Failed to lower privileges");
1790
}
1791
}
1792
1793
/* Close the socket */
1794
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1795
if(ret == -1){
1796
perror_plus("close");
1797
}
1798
1799
if(ret_setflags == -1){
1800
errno = ioctl_errno;
1801
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1802
errno = old_errno;
1803
return ioctl_errno;
1804
}
1805
} else if(debug){
1806
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1807
interface);
1808
}
1809
1810
/* Sleep checking until interface is running.
1811
Check every 0.25s, up to total time of delay */
1812
for(int i=0; i < delay * 4; i++){
1813
if(interface_is_running(interface)){
1814
break;
1815
}
1816
struct timespec sleeptime = { .tv_nsec = 250000000 };
1817
ret = nanosleep(&sleeptime, NULL);
1818
if(ret == -1 and errno != EINTR){
1819
perror_plus("nanosleep");
1820
}
1821
}
1822
1823
errno = old_errno;
1824
return 0;
1825
}
1826
1827
__attribute__((nonnull, warn_unused_result))
1828
error_t take_down_interface(const char *const interface){
1829
error_t old_errno = errno;
1830
struct ifreq network;
1831
unsigned int if_index = if_nametoindex(interface);
1832
if(if_index == 0){
1833
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1834
errno = old_errno;
1835
return ENXIO;
1836
}
1837
if(interface_is_up(interface)){
1838
error_t ret_errno = 0, ioctl_errno = 0;
1839
if(not get_flags(interface, &network) and debug){
1840
ret_errno = errno;
1841
fprintf_plus(stderr, "Failed to get flags for interface "
1842
"\"%s\"\n", interface);
1843
errno = old_errno;
1844
return ret_errno;
1845
}
1846
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1847
1848
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1849
if(sd == -1){
1850
ret_errno = errno;
1851
perror_plus("socket");
1852
errno = old_errno;
1853
return ret_errno;
1854
}
1855
1856
if(debug){
1857
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1858
interface);
1859
}
1860
1861
/* Raise privileges */
1862
ret_errno = raise_privileges();
1863
if(ret_errno != 0){
1864
errno = ret_errno;
1865
perror_plus("Failed to raise privileges");
1866
}
1867
1868
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1869
ioctl_errno = errno;
1870
1871
/* If raise_privileges() succeeded above */
1872
if(ret_errno == 0){
1873
/* Lower privileges */
1874
ret_errno = lower_privileges();
1875
if(ret_errno != 0){
1876
errno = ret_errno;
1877
perror_plus("Failed to lower privileges");
1878
}
1879
}
1880
1881
/* Close the socket */
1882
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1883
if(ret == -1){
1884
perror_plus("close");
1885
}
1886
1887
if(ret_setflags == -1){
1888
errno = ioctl_errno;
1889
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1890
errno = old_errno;
1891
return ioctl_errno;
1892
}
1893
} else if(debug){
1894
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1895
interface);
1896
}
1897
1898
errno = old_errno;
1899
return 0;
1900
}
748
/* Combines file name and path and returns the malloced new
749
string. some sane checks could/should be added */
750
static char *combinepath(const char *first, const char *second){
751
char *tmp;
752
int ret = asprintf(&tmp, "%s/%s", first, second);
753
if(ret < 0){
754
return NULL;
755
}
756
return tmp;
757
}
758
1901
759
1902
760
int main(int argc, char *argv[]){
1903
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1904
.priority = "SECURE256:!CTYPE-X.509:"
1905
"+CTYPE-OPENPGP", .current_server = NULL,
1906
.interfaces = NULL, .interfaces_size = 0 };
1907
AvahiSServiceBrowser *sb = NULL;
1908
error_t ret_errno;
1909
int ret;
1910
intmax_t tmpmax;
1911
char *tmp;
1912
int exitcode = EXIT_SUCCESS;
1913
char *interfaces_to_take_down = NULL;
1914
size_t interfaces_to_take_down_size = 0;
1915
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1916
char old_tempdir[] = "/tmp/mandosXXXXXX";
1917
char *tempdir = NULL;
1918
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1919
const char *seckey = PATHDIR "/" SECKEY;
1920
const char *pubkey = PATHDIR "/" PUBKEY;
1921
char *interfaces_hooks = NULL;
1922
1923
bool gnutls_initialized = false;
1924
bool gpgme_initialized = false;
1925
float delay = 2.5f;
1926
double retry_interval = 10; /* 10s between trying a server and
1927
retrying the same server again */
1928
1929
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1930
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1931
1932
uid = getuid();
1933
gid = getgid();
1934
1935
/* Lower any group privileges we might have, just to be safe */
1936
errno = 0;
1937
ret = setgid(gid);
1938
if(ret == -1){
1939
perror_plus("setgid");
1940
}
1941
1942
/* Lower user privileges (temporarily) */
1943
errno = 0;
1944
ret = seteuid(uid);
1945
if(ret == -1){
1946
perror_plus("seteuid");
1947
}
1948
1949
if(quit_now){
1950
goto end;
1951
}
1952
1953
{
1954
struct argp_option options[] = {
1955
{ .name = "debug", .key = 128,
1956
.doc = "Debug mode", .group = 3 },
1957
{ .name = "connect", .key = 'c',
1958
.arg = "ADDRESS:PORT",
1959
.doc = "Connect directly to a specific Mandos server",
1960
.group = 1 },
1961
{ .name = "interface", .key = 'i',
1962
.arg = "NAME",
1963
.doc = "Network interface that will be used to search for"
1964
" Mandos servers",
1965
.group = 1 },
1966
{ .name = "seckey", .key = 's',
1967
.arg = "FILE",
1968
.doc = "OpenPGP secret key file base name",
1969
.group = 1 },
1970
{ .name = "pubkey", .key = 'p',
1971
.arg = "FILE",
1972
.doc = "OpenPGP public key file base name",
1973
.group = 2 },
1974
{ .name = "dh-bits", .key = 129,
1975
.arg = "BITS",
1976
.doc = "Bit length of the prime number used in the"
1977
" Diffie-Hellman key exchange",
1978
.group = 2 },
1979
{ .name = "priority", .key = 130,
1980
.arg = "STRING",
1981
.doc = "GnuTLS priority string for the TLS handshake",
1982
.group = 1 },
1983
{ .name = "delay", .key = 131,
1984
.arg = "SECONDS",
1985
.doc = "Maximum delay to wait for interface startup",
1986
.group = 2 },
1987
{ .name = "retry", .key = 132,
1988
.arg = "SECONDS",
1989
.doc = "Retry interval used when denied by the Mandos server",
1990
.group = 2 },
1991
{ .name = "network-hook-dir", .key = 133,
1992
.arg = "DIR",
1993
.doc = "Directory where network hooks are located",
1994
.group = 2 },
1995
/*
1996
* These reproduce what we would get without ARGP_NO_HELP
1997
*/
1998
{ .name = "help", .key = '?',
1999
.doc = "Give this help list", .group = -1 },
2000
{ .name = "usage", .key = -3,
2001
.doc = "Give a short usage message", .group = -1 },
2002
{ .name = "version", .key = 'V',
2003
.doc = "Print program version", .group = -1 },
2004
{ .name = NULL }
2005
};
2006
2007
error_t parse_opt(int key, char *arg,
2008
struct argp_state *state){
761
AvahiSServiceBrowser *sb = NULL;
762
int error;
763
int ret;
764
int exitcode = EXIT_SUCCESS;
765
const char *interface = "eth0";
766
struct ifreq network;
767
int sd;
768
uid_t uid;
769
gid_t gid;
770
char *connect_to = NULL;
771
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
772
char *pubkeyfilename = NULL;
773
char *seckeyfilename = NULL;
774
const char *pubkeyname = "pubkey.txt";
775
const char *seckeyname = "seckey.txt";
776
mandos_context mc = { .simple_poll = NULL, .server = NULL,
777
.dh_bits = 1024, .priority = "SECURE256"};
778
bool gnutls_initalized = false;
779
780
{
781
struct argp_option options[] = {
782
{ .name = "debug", .key = 128,
783
.doc = "Debug mode", .group = 3 },
784
{ .name = "connect", .key = 'c',
785
.arg = "IP",
786
.doc = "Connect directly to a sepcified mandos server",
787
.group = 1 },
788
{ .name = "interface", .key = 'i',
789
.arg = "INTERFACE",
790
.doc = "Interface that Avahi will conntect through",
791
.group = 1 },
792
{ .name = "keydir", .key = 'd',
793
.arg = "KEYDIR",
794
.doc = "Directory where the openpgp keyring is",
795
.group = 1 },
796
{ .name = "seckey", .key = 's',
797
.arg = "SECKEY",
798
.doc = "Secret openpgp key for gnutls authentication",
799
.group = 1 },
800
{ .name = "pubkey", .key = 'p',
801
.arg = "PUBKEY",
802
.doc = "Public openpgp key for gnutls authentication",
803
.group = 2 },
804
{ .name = "dh-bits", .key = 129,
805
.arg = "BITS",
806
.doc = "dh-bits to use in gnutls communication",
807
.group = 2 },
808
{ .name = "priority", .key = 130,
809
.arg = "PRIORITY",
810
.doc = "GNUTLS priority", .group = 1 },
811
{ .name = NULL }
812
};
813
814
815
error_t parse_opt (int key, char *arg,
816
struct argp_state *state) {
817
/* Get the INPUT argument from `argp_parse', which we know is
818
a pointer to our plugin list pointer. */
819
switch (key) {
820
case 128:
821
debug = true;
822
break;
823
case 'c':
824
connect_to = arg;
825
break;
826
case 'i':
827
interface = arg;
828
break;
829
case 'd':
830
keydir = arg;
831
break;
832
case 's':
833
seckeyname = arg;
834
break;
835
case 'p':
836
pubkeyname = arg;
837
break;
838
case 129:
839
errno = 0;
840
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
841
if (errno){
842
perror("strtol");
843
exit(EXIT_FAILURE);
844
}
845
break;
846
case 130:
847
mc.priority = arg;
848
break;
849
case ARGP_KEY_ARG:
850
argp_usage (state);
851
case ARGP_KEY_END:
852
break;
853
default:
854
return ARGP_ERR_UNKNOWN;
855
}
856
return 0;
857
}
858
859
struct argp argp = { .options = options, .parser = parse_opt,
860
.args_doc = "",
861
.doc = "Mandos client -- Get and decrypt"
862
" passwords from mandos server" };
863
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
864
if (ret == ARGP_ERR_UNKNOWN){
865
fprintf(stderr, "Unknown error while parsing arguments\n");
866
exitcode = EXIT_FAILURE;
867
goto end;
868
}
869
}
870
871
pubkeyfilename = combinepath(keydir, pubkeyname);
872
if (pubkeyfilename == NULL){
873
perror("combinepath");
874
exitcode = EXIT_FAILURE;
875
goto end;
876
}
877
878
seckeyfilename = combinepath(keydir, seckeyname);
879
if (seckeyfilename == NULL){
880
perror("combinepath");
881
exitcode = EXIT_FAILURE;
882
goto end;
883
}
884
885
ret = init_gnutls_global(&mc, pubkeyfilename, seckeyfilename);
886
if (ret == -1){
887
fprintf(stderr, "init_gnutls_global failed\n");
888
exitcode = EXIT_FAILURE;
889
goto end;
890
} else {
891
gnutls_initalized = true;
892
}
893
894
/* If the interface is down, bring it up */
895
{
896
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
897
if(sd < 0) {
898
perror("socket");
899
exitcode = EXIT_FAILURE;
900
goto end;
901
}
902
strcpy(network.ifr_name, interface);
903
ret = ioctl(sd, SIOCGIFFLAGS, &network);
904
if(ret == -1){
905
perror("ioctl SIOCGIFFLAGS");
906
exitcode = EXIT_FAILURE;
907
goto end;
908
}
909
if((network.ifr_flags & IFF_UP) == 0){
910
network.ifr_flags |= IFF_UP;
911
ret = ioctl(sd, SIOCSIFFLAGS, &network);
912
if(ret == -1){
913
perror("ioctl SIOCSIFFLAGS");
914
exitcode = EXIT_FAILURE;
915
goto end;
916
}
917
}
918
close(sd);
919
}
920
921
uid = getuid();
922
gid = getgid();
923
924
ret = setuid(uid);
925
if (ret == -1){
926
perror("setuid");
927
}
928
929
setgid(gid);
930
if (ret == -1){
931
perror("setgid");
932
}
933
934
if_index = (AvahiIfIndex) if_nametoindex(interface);
935
if(if_index == 0){
936
fprintf(stderr, "No such interface: \"%s\"\n", interface);
937
exit(EXIT_FAILURE);
938
}
939
940
if(connect_to != NULL){
941
/* Connect directly, do not use Zeroconf */
942
/* (Mainly meant for debugging) */
943
char *address = strrchr(connect_to, ':');
944
if(address == NULL){
945
fprintf(stderr, "No colon in address\n");
946
exitcode = EXIT_FAILURE;
947
goto end;
948
}
2009
949
errno = 0;
2010
switch(key){
2011
case 128: /* --debug */
2012
debug = true;
2013
break;
2014
case 'c': /* --connect */
2015
connect_to = arg;
2016
break;
2017
case 'i': /* --interface */
2018
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2019
arg, (int)',');
2020
if(ret_errno != 0){
2021
argp_error(state, "%s", strerror(ret_errno));
2022
}
2023
break;
2024
case 's': /* --seckey */
2025
seckey = arg;
2026
break;
2027
case 'p': /* --pubkey */
2028
pubkey = arg;
2029
break;
2030
case 129: /* --dh-bits */
2031
errno = 0;
2032
tmpmax = strtoimax(arg, &tmp, 10);
2033
if(errno != 0 or tmp == arg or *tmp != '\0'
2034
or tmpmax != (typeof(mc.dh_bits))tmpmax){
2035
argp_error(state, "Bad number of DH bits");
2036
}
2037
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2038
break;
2039
case 130: /* --priority */
2040
mc.priority = arg;
2041
break;
2042
case 131: /* --delay */
2043
errno = 0;
2044
delay = strtof(arg, &tmp);
2045
if(errno != 0 or tmp == arg or *tmp != '\0'){
2046
argp_error(state, "Bad delay");
2047
}
2048
case 132: /* --retry */
2049
errno = 0;
2050
retry_interval = strtod(arg, &tmp);
2051
if(errno != 0 or tmp == arg or *tmp != '\0'
2052
or (retry_interval * 1000) > INT_MAX
2053
or retry_interval < 0){
2054
argp_error(state, "Bad retry interval");
2055
}
2056
break;
2057
case 133: /* --network-hook-dir */
2058
hookdir = arg;
2059
break;
2060
/*
2061
* These reproduce what we would get without ARGP_NO_HELP
2062
*/
2063
case '?': /* --help */
2064
argp_state_help(state, state->out_stream,
2065
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2066
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2067
case -3: /* --usage */
2068
argp_state_help(state, state->out_stream,
2069
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2070
case 'V': /* --version */
2071
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2072
exit(argp_err_exit_status);
2073
break;
2074
default:
2075
return ARGP_ERR_UNKNOWN;
2076
}
2077
return errno;
2078
}
2079
2080
struct argp argp = { .options = options, .parser = parse_opt,
2081
.args_doc = "",
2082
.doc = "Mandos client -- Get and decrypt"
2083
" passwords from a Mandos server" };
2084
ret = argp_parse(&argp, argc, argv,
2085
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2086
switch(ret){
2087
case 0:
2088
break;
2089
case ENOMEM:
2090
default:
2091
errno = ret;
2092
perror_plus("argp_parse");
2093
exitcode = EX_OSERR;
2094
goto end;
2095
case EINVAL:
2096
exitcode = EX_USAGE;
2097
goto end;
2098
}
2099
}
2100
2101
{
2102
/* Work around Debian bug #633582:
2103
<http://bugs.debian.org/633582> */
2104
2105
/* Re-raise privileges */
2106
ret_errno = raise_privileges();
2107
if(ret_errno != 0){
2108
errno = ret_errno;
2109
perror_plus("Failed to raise privileges");
2110
} else {
2111
struct stat st;
2112
2113
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2114
int seckey_fd = open(seckey, O_RDONLY);
2115
if(seckey_fd == -1){
2116
perror_plus("open");
2117
} else {
2118
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2119
if(ret == -1){
2120
perror_plus("fstat");
2121
} else {
2122
if(S_ISREG(st.st_mode)
2123
and st.st_uid == 0 and st.st_gid == 0){
2124
ret = fchown(seckey_fd, uid, gid);
2125
if(ret == -1){
2126
perror_plus("fchown");
2127
}
2128
}
2129
}
2130
TEMP_FAILURE_RETRY(close(seckey_fd));
2131
}
2132
}
2133
2134
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2135
int pubkey_fd = open(pubkey, O_RDONLY);
2136
if(pubkey_fd == -1){
2137
perror_plus("open");
2138
} else {
2139
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2140
if(ret == -1){
2141
perror_plus("fstat");
2142
} else {
2143
if(S_ISREG(st.st_mode)
2144
and st.st_uid == 0 and st.st_gid == 0){
2145
ret = fchown(pubkey_fd, uid, gid);
2146
if(ret == -1){
2147
perror_plus("fchown");
2148
}
2149
}
2150
}
2151
TEMP_FAILURE_RETRY(close(pubkey_fd));
2152
}
2153
}
2154
2155
/* Lower privileges */
2156
ret_errno = lower_privileges();
2157
if(ret_errno != 0){
2158
errno = ret_errno;
2159
perror_plus("Failed to lower privileges");
2160
}
2161
}
2162
}
2163
2164
/* Remove invalid interface names (except "none") */
2165
{
2166
char *interface = NULL;
2167
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2168
interface))){
2169
if(strcmp(interface, "none") != 0
2170
and if_nametoindex(interface) == 0){
2171
if(interface[0] != '\0'){
2172
fprintf_plus(stderr, "Not using nonexisting interface"
2173
" \"%s\"\n", interface);
2174
}
2175
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2176
interface = NULL;
2177
}
2178
}
2179
}
2180
2181
/* Run network hooks */
2182
{
2183
if(mc.interfaces != NULL){
2184
interfaces_hooks = malloc(mc.interfaces_size);
2185
if(interfaces_hooks == NULL){
2186
perror_plus("malloc");
950
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
951
if(errno){
952
perror("Bad port number");
953
exitcode = EXIT_FAILURE;
2187
954
goto end;
2188
955
}
2189
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2190
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2191
}
2192
run_network_hooks("start", interfaces_hooks != NULL ?
2193
interfaces_hooks : "", delay);
2194
}
2195
2196
if(not debug){
2197
avahi_set_log_function(empty_log);
2198
}
2199
2200
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2201
from the signal handler */
2202
/* Initialize the pseudo-RNG for Avahi */
2203
srand((unsigned int) time(NULL));
2204
simple_poll = avahi_simple_poll_new();
2205
if(simple_poll == NULL){
2206
fprintf_plus(stderr,
2207
"Avahi: Failed to create simple poll object.\n");
2208
exitcode = EX_UNAVAILABLE;
2209
goto end;
2210
}
2211
2212
sigemptyset(&sigterm_action.sa_mask);
2213
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2214
if(ret == -1){
2215
perror_plus("sigaddset");
2216
exitcode = EX_OSERR;
2217
goto end;
2218
}
2219
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2220
if(ret == -1){
2221
perror_plus("sigaddset");
2222
exitcode = EX_OSERR;
2223
goto end;
2224
}
2225
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2226
if(ret == -1){
2227
perror_plus("sigaddset");
2228
exitcode = EX_OSERR;
2229
goto end;
2230
}
2231
/* Need to check if the handler is SIG_IGN before handling:
2232
| [[info:libc:Initial Signal Actions]] |
2233
| [[info:libc:Basic Signal Handling]] |
2234
*/
2235
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2236
if(ret == -1){
2237
perror_plus("sigaction");
2238
return EX_OSERR;
2239
}
2240
if(old_sigterm_action.sa_handler != SIG_IGN){
2241
ret = sigaction(SIGINT, &sigterm_action, NULL);
2242
if(ret == -1){
2243
perror_plus("sigaction");
2244
exitcode = EX_OSERR;
2245
goto end;
2246
}
2247
}
2248
ret = sigaction(SIGHUP, 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(SIGHUP, &sigterm_action, NULL);
2255
if(ret == -1){
2256
perror_plus("sigaction");
2257
exitcode = EX_OSERR;
2258
goto end;
2259
}
2260
}
2261
ret = sigaction(SIGTERM, 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(SIGTERM, &sigterm_action, NULL);
2268
if(ret == -1){
2269
perror_plus("sigaction");
2270
exitcode = EX_OSERR;
2271
goto end;
2272
}
2273
}
2274
2275
/* If no interfaces were specified, make a list */
2276
if(mc.interfaces == NULL){
2277
struct dirent **direntries = NULL;
2278
/* Look for any good interfaces */
2279
ret = scandir(sys_class_net, &direntries, good_interface,
2280
alphasort);
2281
if(ret >= 1){
2282
/* Add all found interfaces to interfaces list */
2283
for(int i = 0; i < ret; ++i){
2284
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2285
direntries[i]->d_name);
2286
if(ret_errno != 0){
2287
errno = ret_errno;
2288
perror_plus("argz_add");
2289
free(direntries[i]);
2290
continue;
2291
}
2292
if(debug){
2293
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2294
direntries[i]->d_name);
2295
}
2296
free(direntries[i]);
2297
}
2298
free(direntries);
2299
} else {
2300
if(ret == 0){
2301
free(direntries);
2302
}
2303
fprintf_plus(stderr, "Could not find a network interface\n");
2304
exitcode = EXIT_FAILURE;
2305
goto end;
2306
}
2307
}
2308
2309
/* Bring up interfaces which are down, and remove any "none"s */
2310
{
2311
char *interface = NULL;
2312
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2313
interface))){
2314
/* If interface name is "none", stop bringing up interfaces.
2315
Also remove all instances of "none" from the list */
2316
if(strcmp(interface, "none") == 0){
2317
argz_delete(&mc.interfaces, &mc.interfaces_size,
2318
interface);
2319
interface = NULL;
2320
while((interface = argz_next(mc.interfaces,
2321
mc.interfaces_size, interface))){
2322
if(strcmp(interface, "none") == 0){
2323
argz_delete(&mc.interfaces, &mc.interfaces_size,
2324
interface);
2325
interface = NULL;
2326
}
2327
}
2328
break;
2329
}
2330
bool interface_was_up = interface_is_up(interface);
2331
errno = bring_up_interface(interface, delay);
2332
if(not interface_was_up){
2333
if(errno != 0){
2334
perror_plus("Failed to bring up interface");
2335
} else {
2336
errno = argz_add(&interfaces_to_take_down,
2337
&interfaces_to_take_down_size,
2338
interface);
2339
if(errno != 0){
2340
perror_plus("argz_add");
2341
}
2342
}
2343
}
2344
}
2345
if(debug and (interfaces_to_take_down == NULL)){
2346
fprintf_plus(stderr, "No interfaces were brought up\n");
2347
}
2348
}
2349
2350
/* If we only got one interface, explicitly use only that one */
2351
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2352
if(debug){
2353
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2354
mc.interfaces);
2355
}
2356
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2357
}
2358
2359
if(quit_now){
2360
goto end;
2361
}
2362
2363
ret = init_gnutls_global(pubkey, seckey, &mc);
2364
if(ret == -1){
2365
fprintf_plus(stderr, "init_gnutls_global failed\n");
2366
exitcode = EX_UNAVAILABLE;
2367
goto end;
2368
} else {
2369
gnutls_initialized = true;
2370
}
2371
2372
if(quit_now){
2373
goto end;
2374
}
2375
2376
/* Try /run/tmp before /tmp */
2377
tempdir = mkdtemp(run_tempdir);
2378
if(tempdir == NULL and errno == ENOENT){
2379
if(debug){
2380
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2381
run_tempdir, old_tempdir);
2382
}
2383
tempdir = mkdtemp(old_tempdir);
2384
}
2385
if(tempdir == NULL){
2386
perror_plus("mkdtemp");
2387
goto end;
2388
}
2389
2390
if(quit_now){
2391
goto end;
2392
}
2393
2394
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2395
fprintf_plus(stderr, "init_gpgme failed\n");
2396
exitcode = EX_UNAVAILABLE;
2397
goto end;
2398
} else {
2399
gpgme_initialized = true;
2400
}
2401
2402
if(quit_now){
2403
goto end;
2404
}
2405
2406
if(connect_to != NULL){
2407
/* Connect directly, do not use Zeroconf */
2408
/* (Mainly meant for debugging) */
2409
char *address = strrchr(connect_to, ':');
2410
2411
if(address == NULL){
2412
fprintf_plus(stderr, "No colon in address\n");
2413
exitcode = EX_USAGE;
2414
goto end;
2415
}
2416
2417
if(quit_now){
2418
goto end;
2419
}
2420
2421
in_port_t port;
2422
errno = 0;
2423
tmpmax = strtoimax(address+1, &tmp, 10);
2424
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2425
or tmpmax != (in_port_t)tmpmax){
2426
fprintf_plus(stderr, "Bad port number\n");
2427
exitcode = EX_USAGE;
2428
goto end;
2429
}
2430
2431
if(quit_now){
2432
goto end;
2433
}
2434
2435
port = (in_port_t)tmpmax;
2436
*address = '\0';
2437
/* Colon in address indicates IPv6 */
2438
int af;
2439
if(strchr(connect_to, ':') != NULL){
2440
af = AF_INET6;
2441
/* Accept [] around IPv6 address - see RFC 5952 */
2442
if(connect_to[0] == '[' and address[-1] == ']')
2443
{
2444
connect_to++;
2445
address[-1] = '\0';
2446
}
2447
} else {
2448
af = AF_INET;
2449
}
2450
address = connect_to;
2451
2452
if(quit_now){
2453
goto end;
2454
}
2455
2456
while(not quit_now){
2457
ret = start_mandos_communication(address, port, if_index, af,
2458
&mc);
2459
if(quit_now or ret == 0){
2460
break;
2461
}
2462
if(debug){
2463
fprintf_plus(stderr, "Retrying in %d seconds\n",
2464
(int)retry_interval);
2465
}
2466
sleep((unsigned int)retry_interval);
2467
}
2468
2469
if(not quit_now){
2470
exitcode = EXIT_SUCCESS;
2471
}
2472
2473
goto end;
2474
}
2475
2476
if(quit_now){
2477
goto end;
2478
}
2479
2480
{
2481
AvahiServerConfig config;
2482
/* Do not publish any local Zeroconf records */
2483
avahi_server_config_init(&config);
2484
config.publish_hinfo = 0;
2485
config.publish_addresses = 0;
2486
config.publish_workstation = 0;
2487
config.publish_domain = 0;
2488
2489
/* Allocate a new server */
2490
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2491
&config, NULL, NULL, &ret_errno);
2492
2493
/* Free the Avahi configuration data */
2494
avahi_server_config_free(&config);
2495
}
2496
2497
/* Check if creating the Avahi server object succeeded */
2498
if(mc.server == NULL){
2499
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2500
avahi_strerror(ret_errno));
2501
exitcode = EX_UNAVAILABLE;
2502
goto end;
2503
}
2504
2505
if(quit_now){
2506
goto end;
2507
}
2508
2509
/* Create the Avahi service browser */
2510
sb = avahi_s_service_browser_new(mc.server, if_index,
2511
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2512
NULL, 0, browse_callback,
2513
(void *)&mc);
2514
if(sb == NULL){
2515
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2516
avahi_strerror(avahi_server_errno(mc.server)));
2517
exitcode = EX_UNAVAILABLE;
2518
goto end;
2519
}
2520
2521
if(quit_now){
2522
goto end;
2523
}
2524
2525
/* Run the main loop */
2526
2527
if(debug){
2528
fprintf_plus(stderr, "Starting Avahi loop search\n");
2529
}
2530
2531
ret = avahi_loop_with_timeout(simple_poll,
2532
(int)(retry_interval * 1000), &mc);
2533
if(debug){
2534
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2535
(ret == 0) ? "successfully" : "with error");
2536
}
2537
956
*address = '\0';
957
address = connect_to;
958
ret = start_mandos_communication(address, port, if_index, &mc);
959
if(ret < 0){
960
exitcode = EXIT_FAILURE;
961
} else {
962
exitcode = EXIT_SUCCESS;
963
}
964
goto end;
965
}
966
967
if (not debug){
968
avahi_set_log_function(empty_log);
969
}
970
971
/* Initialize the pseudo-RNG for Avahi */
972
srand((unsigned int) time(NULL));
973
974
/* Allocate main Avahi loop object */
975
mc.simple_poll = avahi_simple_poll_new();
976
if (mc.simple_poll == NULL) {
977
fprintf(stderr, "Avahi: Failed to create simple poll"
978
" object.\n");
979
exitcode = EXIT_FAILURE;
980
goto end;
981
}
982
983
{
984
AvahiServerConfig config;
985
/* Do not publish any local Zeroconf records */
986
avahi_server_config_init(&config);
987
config.publish_hinfo = 0;
988
config.publish_addresses = 0;
989
config.publish_workstation = 0;
990
config.publish_domain = 0;
991
992
/* Allocate a new server */
993
mc.server = avahi_server_new(avahi_simple_poll_get
994
(mc.simple_poll), &config, NULL,
995
NULL, &error);
996
997
/* Free the Avahi configuration data */
998
avahi_server_config_free(&config);
999
}
1000
1001
/* Check if creating the Avahi server object succeeded */
1002
if (mc.server == NULL) {
1003
fprintf(stderr, "Failed to create Avahi server: %s\n",
1004
avahi_strerror(error));
1005
exitcode = EXIT_FAILURE;
1006
goto end;
1007
}
1008
1009
/* Create the Avahi service browser */
1010
sb = avahi_s_service_browser_new(mc.server, if_index,
1011
AVAHI_PROTO_INET6,
1012
"_mandos._tcp", NULL, 0,
1013
browse_callback, &mc);
1014
if (sb == NULL) {
1015
fprintf(stderr, "Failed to create service browser: %s\n",
1016
avahi_strerror(avahi_server_errno(mc.server)));
1017
exitcode = EXIT_FAILURE;
1018
goto end;
1019
}
1020
1021
/* Run the main loop */
1022
1023
if (debug){
1024
fprintf(stderr, "Starting Avahi loop search\n");
1025
}
1026
1027
avahi_simple_poll_loop(mc.simple_poll);
1028
2538
1029
end:
2539
2540
if(debug){
2541
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2542
}
2543
2544
/* Cleanup things */
2545
free(mc.interfaces);
2546
2547
if(sb != NULL)
2548
avahi_s_service_browser_free(sb);
2549
2550
if(mc.server != NULL)
2551
avahi_server_free(mc.server);
2552
2553
if(simple_poll != NULL)
2554
avahi_simple_poll_free(simple_poll);
2555
2556
if(gnutls_initialized){
2557
gnutls_certificate_free_credentials(mc.cred);
2558
gnutls_global_deinit();
2559
gnutls_dh_params_deinit(mc.dh_params);
2560
}
2561
2562
if(gpgme_initialized){
2563
gpgme_release(mc.ctx);
2564
}
2565
2566
/* Cleans up the circular linked list of Mandos servers the client
2567
has seen */
2568
if(mc.current_server != NULL){
2569
mc.current_server->prev->next = NULL;
2570
while(mc.current_server != NULL){
2571
server *next = mc.current_server->next;
2572
#ifdef __GNUC__
2573
#pragma GCC diagnostic push
2574
#pragma GCC diagnostic ignored "-Wcast-qual"
2575
#endif
2576
free((char *)(mc.current_server->ip));
2577
#ifdef __GNUC__
2578
#pragma GCC diagnostic pop
2579
#endif
2580
free(mc.current_server);
2581
mc.current_server = next;
2582
}
2583
}
2584
2585
/* Re-raise privileges */
2586
{
2587
ret_errno = raise_privileges();
2588
if(ret_errno != 0){
2589
errno = ret_errno;
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
errno = ret_errno;
2619
perror_plus("Failed to lower privileges permanently");
2620
}
2621
}
2622
2623
free(interfaces_to_take_down);
2624
free(interfaces_hooks);
2625
2626
/* Removes the GPGME temp directory and all files inside */
2627
if(tempdir != NULL){
2628
struct dirent **direntries = NULL;
2629
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2630
O_NOFOLLOW));
2631
if(tempdir_fd == -1){
2632
perror_plus("open");
2633
} else {
2634
#ifdef __GLIBC__
2635
#if __GLIBC_PREREQ(2, 15)
2636
int numentries = scandirat(tempdir_fd, ".", &direntries,
2637
notdotentries, alphasort);
2638
#else /* not __GLIBC_PREREQ(2, 15) */
2639
int numentries = scandir(tempdir, &direntries, notdotentries,
2640
alphasort);
2641
#endif /* not __GLIBC_PREREQ(2, 15) */
2642
#else /* not __GLIBC__ */
2643
int numentries = scandir(tempdir, &direntries, notdotentries,
2644
alphasort);
2645
#endif /* not __GLIBC__ */
2646
if(numentries >= 0){
2647
for(int i = 0; i < numentries; i++){
2648
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2649
if(ret == -1){
2650
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2651
" \"%s\", 0): %s\n", tempdir,
2652
direntries[i]->d_name, strerror(errno));
2653
}
2654
free(direntries[i]);
2655
}
2656
2657
/* need to clean even if 0 because man page doesn't specify */
2658
free(direntries);
2659
if(numentries == -1){
2660
perror_plus("scandir");
2661
}
2662
ret = rmdir(tempdir);
2663
if(ret == -1 and errno != ENOENT){
2664
perror_plus("rmdir");
2665
}
2666
}
2667
TEMP_FAILURE_RETRY(close(tempdir_fd));
2668
}
2669
}
2670
2671
if(quit_now){
2672
sigemptyset(&old_sigterm_action.sa_mask);
2673
old_sigterm_action.sa_handler = SIG_DFL;
2674
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2675
&old_sigterm_action,
2676
NULL));
2677
if(ret == -1){
2678
perror_plus("sigaction");
2679
}
2680
do {
2681
ret = raise(signal_received);
2682
} while(ret != 0 and errno == EINTR);
2683
if(ret != 0){
2684
perror_plus("raise");
2685
abort();
2686
}
2687
TEMP_FAILURE_RETRY(pause());
2688
}
2689
2690
return exitcode;
1030
1031
if (debug){
1032
fprintf(stderr, "%s exiting\n", argv[0]);
1033
}
1034
1035
/* Cleanup things */
1036
if (sb != NULL)
1037
avahi_s_service_browser_free(sb);
1038
1039
if (mc.server != NULL)
1040
avahi_server_free(mc.server);
1041
1042
if (mc.simple_poll != NULL)
1043
avahi_simple_poll_free(mc.simple_poll);
1044
free(pubkeyfilename);
1045
free(seckeyfilename);
1046
1047
if (gnutls_initalized){
1048
gnutls_certificate_free_credentials(mc.cred);
1049
gnutls_global_deinit ();
1050
}
1051
1052
return exitcode;
2691
1053
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0