To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugins.d/mandos-client.c
- browse files at revision 222
- compare with another revision
- download diff
- download tarball
- view history from revision 222
- Committer: Teddy Hogeborn
- Date: 2008-10-01 18:41:06 UTC
- Revision ID: teddy@fukt.bsnet.se-20081001184106-r728au6iv0lq8orm
Tags: version-1.0-2
* debian/changelog: Add Debian revision number to old revision too.
- files added:
- debian/mandos-client.config
- files removed:
- DBUS-API
- debian/source
- debian/upstream
- network-hooks.d
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
1
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
* Mandos-client - get and decrypt data from a Mandos server
3
* Mandos client - get and decrypt data from a Mandos server
4
4
*
5
5
* This program is partly derived from an example program for an Avahi
6
6
* service browser, downloaded from
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 Björn Påhlsson
12
* Copyright © 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, open(), opendir(), DIR */
51
#include <sys/stat.h> /* open() */
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 <fcntl.h> /* open() */
56
#include <dirent.h> /* opendir(), struct dirent, readdir() */
57
#include <inttypes.h> /* PRIu16 */
58
#include <assert.h> /* assert() */
59
#include <errno.h> /* perror(), errno */
60
#include <time.h> /* time() */
68
61
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
62
SIOCSIFFLAGS, if_indextoname(),
70
63
if_nametoindex(), IF_NAMESIZE */
71
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
*/
64
#include <netinet/in.h>
74
65
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
79
#include <iso646.h> /* not, or, and */
66
getuid(), getgid(), setuid(),
67
setgid() */
68
#include <arpa/inet.h> /* inet_pton(), htons */
69
#include <iso646.h> /* not, and */
80
70
#include <argp.h> /* struct argp_option, error_t, struct
81
71
argp_state, struct argp,
82
72
argp_parse(), ARGP_KEY_ARG,
83
73
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
74
103
75
/* Avahi */
104
76
/* All Avahi types, constants and functions
117
89
gnutls_*
118
90
init_gnutls_session(),
119
91
GNUTLS_* */
120
#include <gnutls/openpgp.h>
121
/* gnutls_certificate_set_openpgp_key_file(),
122
GNUTLS_OPENPGP_FMT_BASE64 */
92
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
93
GNUTLS_OPENPGP_FMT_BASE64 */
123
94
124
95
/* GPGME */
125
96
#include <gpgme.h> /* All GPGME types, constants and
133
104
#define PATHDIR "/conf/conf.d/mandos"
134
105
#define SECKEY "seckey.txt"
135
106
#define PUBKEY "pubkey.txt"
136
#define HOOKDIR "/lib/mandos/network-hooks.d"
137
107
138
108
bool debug = false;
139
109
static const char mandos_protocol_version[] = "1";
140
110
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;
111
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
159
112
160
113
/* Used for passing in values through the Avahi callback functions */
161
114
typedef struct {
115
AvahiSimplePoll *simple_poll;
162
116
AvahiServer *server;
163
117
gnutls_certificate_credentials_t cred;
164
118
unsigned int dh_bits;
165
119
gnutls_dh_params_t dh_params;
166
120
const char *priority;
167
121
gpgme_ctx_t ctx;
168
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
171
122
} mandos_context;
172
123
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
124
/*
199
* Make additional room in "buffer" for at least BUFFER_SIZE more
200
* bytes. "buffer_capacity" is how much is currently allocated,
125
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
126
* "buffer_capacity" is how much is currently allocated,
201
127
* "buffer_length" is how much is already used.
202
128
*/
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;
129
size_t adjustbuffer(char **buffer, size_t buffer_length,
130
size_t buffer_capacity){
131
if (buffer_length + BUFFER_SIZE > buffer_capacity){
132
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
133
if (buffer == NULL){
213
134
return 0;
214
135
}
215
*buffer = new_buf;
216
136
buffer_capacity += BUFFER_SIZE;
217
137
}
218
138
return buffer_capacity;
219
139
}
220
140
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
141
/*
270
142
* Initialize GPGME.
271
143
*/
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){
144
static bool init_gpgme(mandos_context *mc, const char *seckey,
145
const char *pubkey, const char *tempdir){
146
int ret;
277
147
gpgme_error_t rc;
278
148
gpgme_engine_info_t engine_info;
279
149
150
280
151
/*
281
* Helper function to insert pub and seckey to the engine keyring.
152
* Helper function to insert pub and seckey to the enigne keyring.
282
153
*/
283
bool import_key(const char * const filename){
284
int ret;
154
bool import_key(const char *filename){
285
155
int fd;
286
156
gpgme_data_t pgp_data;
287
157
288
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
158
fd = TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
289
159
if(fd == -1){
290
perror_plus("open");
160
perror("open");
291
161
return false;
292
162
}
293
163
294
164
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));
165
if (rc != GPG_ERR_NO_ERROR){
166
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
167
gpgme_strsource(rc), gpgme_strerror(rc));
298
168
return false;
299
169
}
300
170
301
171
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));
172
if (rc != GPG_ERR_NO_ERROR){
173
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
174
gpgme_strsource(rc), gpgme_strerror(rc));
305
175
return false;
306
176
}
307
177
308
ret = (int)TEMP_FAILURE_RETRY(close(fd));
178
ret = TEMP_FAILURE_RETRY(close(fd));
309
179
if(ret == -1){
310
perror_plus("close");
180
perror("close");
311
181
}
312
182
gpgme_data_release(pgp_data);
313
183
return true;
314
184
}
315
185
316
if(debug){
317
fprintf_plus(stderr, "Initializing GPGME\n");
186
if (debug){
187
fprintf(stderr, "Initialize gpgme\n");
318
188
}
319
189
320
190
/* Init GPGME */
321
191
gpgme_check_version(NULL);
322
192
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));
193
if (rc != GPG_ERR_NO_ERROR){
194
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
326
196
return false;
327
197
}
328
198
329
/* 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));
199
/* Set GPGME home directory for the OpenPGP engine only */
200
rc = gpgme_get_engine_info (&engine_info);
201
if (rc != GPG_ERR_NO_ERROR){
202
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
203
gpgme_strsource(rc), gpgme_strerror(rc));
334
204
return false;
335
205
}
336
206
while(engine_info != NULL){
342
212
engine_info = engine_info->next;
343
213
}
344
214
if(engine_info == NULL){
345
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
346
tempdir);
215
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
347
216
return false;
348
217
}
349
218
350
219
/* Create new GPGME "context" */
351
220
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;
221
if (rc != GPG_ERR_NO_ERROR){
222
fprintf(stderr, "bad gpgme_new: %s: %s\n",
223
gpgme_strsource(rc), gpgme_strerror(rc));
224
return false;
225
}
226
227
if (not import_key(pubkey) or not import_key(seckey)){
228
return false;
229
}
230
231
return true;
364
232
}
365
233
366
234
/*
367
235
* Decrypt OpenPGP data.
368
236
* Returns -1 on error
369
237
*/
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){
238
static ssize_t pgp_packet_decrypt (const mandos_context *mc,
239
const char *cryptotext,
240
size_t crypto_size,
241
char **plaintext){
375
242
gpgme_data_t dh_crypto, dh_plain;
376
243
gpgme_error_t rc;
377
244
ssize_t ret;
378
245
size_t plaintext_capacity = 0;
379
246
ssize_t plaintext_length = 0;
380
247
381
if(debug){
382
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
248
if (debug){
249
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
383
250
}
384
251
385
252
/* Create new GPGME data buffer from memory cryptotext */
386
253
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
387
254
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));
255
if (rc != GPG_ERR_NO_ERROR){
256
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
257
gpgme_strsource(rc), gpgme_strerror(rc));
391
258
return -1;
392
259
}
393
260
394
261
/* Create new empty GPGME data buffer for the plaintext */
395
262
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));
263
if (rc != GPG_ERR_NO_ERROR){
264
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
265
gpgme_strsource(rc), gpgme_strerror(rc));
400
266
gpgme_data_release(dh_crypto);
401
267
return -1;
402
268
}
404
270
/* Decrypt data from the cryptotext data buffer to the plaintext
405
271
data buffer */
406
272
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));
273
if (rc != GPG_ERR_NO_ERROR){
274
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
275
gpgme_strsource(rc), gpgme_strerror(rc));
410
276
plaintext_length = -1;
411
if(debug){
277
if (debug){
412
278
gpgme_decrypt_result_t result;
413
279
result = gpgme_op_decrypt_result(mc->ctx);
414
if(result == NULL){
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
280
if (result == NULL){
281
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
416
282
} 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);
283
fprintf(stderr, "Unsupported algorithm: %s\n",
284
result->unsupported_algorithm);
285
fprintf(stderr, "Wrong key usage: %u\n",
286
result->wrong_key_usage);
421
287
if(result->file_name != NULL){
422
fprintf_plus(stderr, "File name: %s\n", result->file_name);
288
fprintf(stderr, "File name: %s\n", result->file_name);
423
289
}
424
290
gpgme_recipient_t recipient;
425
291
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;
292
if(recipient){
293
while(recipient != NULL){
294
fprintf(stderr, "Public key algorithm: %s\n",
295
gpgme_pubkey_algo_name(recipient->pubkey_algo));
296
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
297
fprintf(stderr, "Secret key available: %s\n",
298
recipient->status == GPG_ERR_NO_SECKEY
299
? "No" : "Yes");
300
recipient = recipient->next;
301
}
435
302
}
436
303
}
437
304
}
439
306
}
440
307
441
308
if(debug){
442
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
309
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
443
310
}
444
311
445
312
/* 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");
313
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
314
perror("gpgme_data_seek");
448
315
plaintext_length = -1;
449
316
goto decrypt_end;
450
317
}
451
318
452
319
*plaintext = NULL;
453
320
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;
321
plaintext_capacity = adjustbuffer(plaintext,
322
(size_t)plaintext_length,
323
plaintext_capacity);
324
if (plaintext_capacity == 0){
325
perror("adjustbuffer");
326
plaintext_length = -1;
327
goto decrypt_end;
461
328
}
462
329
463
330
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
464
331
BUFFER_SIZE);
465
332
/* Print the data, if any */
466
if(ret == 0){
333
if (ret == 0){
467
334
/* EOF */
468
335
break;
469
336
}
470
337
if(ret < 0){
471
perror_plus("gpgme_data_read");
338
perror("gpgme_data_read");
472
339
plaintext_length = -1;
473
340
goto decrypt_end;
474
341
}
476
343
}
477
344
478
345
if(debug){
479
fprintf_plus(stderr, "Decrypted password is: ");
346
fprintf(stderr, "Decrypted password is: ");
480
347
for(ssize_t i = 0; i < plaintext_length; i++){
481
348
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
482
349
}
493
360
return plaintext_length;
494
361
}
495
362
496
__attribute__((warn_unused_result, const))
497
static const char *safe_string(const char *str){
498
if(str == NULL)
499
return "(unknown)";
500
return str;
501
}
502
503
__attribute__((warn_unused_result))
504
static const char *safer_gnutls_strerror(int value){
505
const char *ret = gnutls_strerror(value);
506
return safe_string(ret);
363
static const char * safer_gnutls_strerror (int value) {
364
const char *ret = gnutls_strerror (value); /* Spurious warning */
365
if (ret == NULL)
366
ret = "(unknown)";
367
return ret;
507
368
}
508
369
509
370
/* GnuTLS log function callback */
510
__attribute__((nonnull))
511
371
static void debuggnutls(__attribute__((unused)) int level,
512
372
const char* string){
513
fprintf_plus(stderr, "GnuTLS: %s", string);
373
fprintf(stderr, "GnuTLS: %s", string);
514
374
}
515
375
516
__attribute__((nonnull, warn_unused_result))
517
static int init_gnutls_global(const char *pubkeyfilename,
518
const char *seckeyfilename,
519
mandos_context *mc){
376
static int init_gnutls_global(mandos_context *mc,
377
const char *pubkeyfilename,
378
const char *seckeyfilename){
520
379
int ret;
521
unsigned int uret;
522
380
523
381
if(debug){
524
fprintf_plus(stderr, "Initializing GnuTLS\n");
382
fprintf(stderr, "Initializing GnuTLS\n");
525
383
}
526
384
527
385
ret = gnutls_global_init();
528
if(ret != GNUTLS_E_SUCCESS){
529
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
530
safer_gnutls_strerror(ret));
386
if (ret != GNUTLS_E_SUCCESS) {
387
fprintf (stderr, "GnuTLS global_init: %s\n",
388
safer_gnutls_strerror(ret));
531
389
return -1;
532
390
}
533
391
534
if(debug){
392
if (debug){
535
393
/* "Use a log level over 10 to enable all debugging options."
536
394
* - GnuTLS manual
537
395
*/
540
398
}
541
399
542
400
/* OpenPGP credentials */
543
ret = gnutls_certificate_allocate_credentials(&mc->cred);
544
if(ret != GNUTLS_E_SUCCESS){
545
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
546
safer_gnutls_strerror(ret));
547
gnutls_global_deinit();
401
gnutls_certificate_allocate_credentials(&mc->cred);
402
if (ret != GNUTLS_E_SUCCESS){
403
fprintf (stderr, "GnuTLS memory error: %s\n", /* Spurious
404
warning */
405
safer_gnutls_strerror(ret));
406
gnutls_global_deinit ();
548
407
return -1;
549
408
}
550
409
551
410
if(debug){
552
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
553
" secret key %s as GnuTLS credentials\n",
554
pubkeyfilename,
555
seckeyfilename);
411
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
412
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
413
seckeyfilename);
556
414
}
557
415
558
416
ret = gnutls_certificate_set_openpgp_key_file
559
417
(mc->cred, pubkeyfilename, seckeyfilename,
560
418
GNUTLS_OPENPGP_FMT_BASE64);
561
if(ret != GNUTLS_E_SUCCESS){
562
fprintf_plus(stderr,
563
"Error[%d] while reading the OpenPGP key pair ('%s',"
564
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
565
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
566
safer_gnutls_strerror(ret));
419
if (ret != GNUTLS_E_SUCCESS) {
420
fprintf(stderr,
421
"Error[%d] while reading the OpenPGP key pair ('%s',"
422
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
423
fprintf(stderr, "The GnuTLS error is: %s\n",
424
safer_gnutls_strerror(ret));
567
425
goto globalfail;
568
426
}
569
427
570
428
/* GnuTLS server initialization */
571
429
ret = gnutls_dh_params_init(&mc->dh_params);
572
if(ret != GNUTLS_E_SUCCESS){
573
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
574
" initialization: %s\n",
575
safer_gnutls_strerror(ret));
430
if (ret != GNUTLS_E_SUCCESS) {
431
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
432
" %s\n", safer_gnutls_strerror(ret));
576
433
goto globalfail;
577
434
}
578
if(mc->dh_bits == 0){
579
/* Find out the optimal number of DH bits */
580
/* Try to read the private key file */
581
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
582
{
583
int secfile = open(seckeyfilename, O_RDONLY);
584
size_t buffer_capacity = 0;
585
while(true){
586
buffer_capacity = incbuffer((char **)&buffer.data,
587
(size_t)buffer.size,
588
(size_t)buffer_capacity);
589
if(buffer_capacity == 0){
590
perror_plus("incbuffer");
591
free(buffer.data);
592
buffer.data = NULL;
593
break;
594
}
595
ssize_t bytes_read = read(secfile, buffer.data + buffer.size,
596
BUFFER_SIZE);
597
/* EOF */
598
if(bytes_read == 0){
599
break;
600
}
601
/* check bytes_read for failure */
602
if(bytes_read < 0){
603
perror_plus("read");
604
free(buffer.data);
605
buffer.data = NULL;
606
break;
607
}
608
buffer.size += (unsigned int)bytes_read;
609
}
610
close(secfile);
611
}
612
/* If successful, use buffer to parse private key */
613
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
614
if(buffer.data != NULL){
615
{
616
gnutls_openpgp_privkey_t privkey = NULL;
617
ret = gnutls_openpgp_privkey_init(&privkey);
618
if(ret != GNUTLS_E_SUCCESS){
619
fprintf_plus(stderr, "Error initializing OpenPGP key"
620
" structure: %s", safer_gnutls_strerror(ret));
621
free(buffer.data);
622
buffer.data = NULL;
623
} else {
624
ret = gnutls_openpgp_privkey_import(privkey, &buffer,
625
GNUTLS_OPENPGP_FMT_BASE64,
626
"", 0);
627
if(ret != GNUTLS_E_SUCCESS){
628
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
629
safer_gnutls_strerror(ret));
630
privkey = NULL;
631
}
632
free(buffer.data);
633
buffer.data = NULL;
634
if(privkey != NULL){
635
/* Use private key to suggest an appropriate sec_param */
636
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
637
gnutls_openpgp_privkey_deinit(privkey);
638
if(debug){
639
fprintf_plus(stderr, "This OpenPGP key implies using a"
640
" GnuTLS security parameter \"%s\".\n",
641
safe_string(gnutls_sec_param_get_name
642
(sec_param)));
643
}
644
}
645
}
646
}
647
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
648
/* Err on the side of caution */
649
sec_param = GNUTLS_SEC_PARAM_ULTRA;
650
if(debug){
651
fprintf_plus(stderr, "Falling back to security parameter"
652
" \"%s\"\n",
653
safe_string(gnutls_sec_param_get_name
654
(sec_param)));
655
}
656
}
657
}
658
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
659
if(uret != 0){
660
mc->dh_bits = uret;
661
if(debug){
662
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
663
" implies %u DH bits; using that.\n",
664
safe_string(gnutls_sec_param_get_name
665
(sec_param)),
666
mc->dh_bits);
667
}
668
} else {
669
fprintf_plus(stderr, "Failed to get implied number of DH"
670
" bits for security parameter \"%s\"): %s\n",
671
safe_string(gnutls_sec_param_get_name(sec_param)),
672
safer_gnutls_strerror(ret));
673
goto globalfail;
674
}
675
} else if(debug){
676
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
677
mc->dh_bits);
678
}
679
435
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
680
if(ret != GNUTLS_E_SUCCESS){
681
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u bits):"
682
" %s\n", mc->dh_bits, safer_gnutls_strerror(ret));
436
if (ret != GNUTLS_E_SUCCESS) {
437
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
438
safer_gnutls_strerror(ret));
683
439
goto globalfail;
684
440
}
685
441
695
451
return -1;
696
452
}
697
453
698
__attribute__((nonnull, warn_unused_result))
699
static int init_gnutls_session(gnutls_session_t *session,
700
mandos_context *mc){
454
static int init_gnutls_session(mandos_context *mc,
455
gnutls_session_t *session){
701
456
int ret;
702
457
/* GnuTLS session creation */
703
do {
704
ret = gnutls_init(session, GNUTLS_SERVER);
705
if(quit_now){
706
return -1;
707
}
708
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
709
if(ret != GNUTLS_E_SUCCESS){
710
fprintf_plus(stderr,
711
"Error in GnuTLS session initialization: %s\n",
712
safer_gnutls_strerror(ret));
458
ret = gnutls_init(session, GNUTLS_SERVER);
459
if (ret != GNUTLS_E_SUCCESS){
460
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
461
safer_gnutls_strerror(ret));
713
462
}
714
463
715
464
{
716
465
const char *err;
717
do {
718
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
719
if(quit_now){
720
gnutls_deinit(*session);
721
return -1;
722
}
723
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
724
if(ret != GNUTLS_E_SUCCESS){
725
fprintf_plus(stderr, "Syntax error at: %s\n", err);
726
fprintf_plus(stderr, "GnuTLS error: %s\n",
727
safer_gnutls_strerror(ret));
728
gnutls_deinit(*session);
466
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
467
if (ret != GNUTLS_E_SUCCESS) {
468
fprintf(stderr, "Syntax error at: %s\n", err);
469
fprintf(stderr, "GnuTLS error: %s\n",
470
safer_gnutls_strerror(ret));
471
gnutls_deinit (*session);
729
472
return -1;
730
473
}
731
474
}
732
475
733
do {
734
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
735
mc->cred);
736
if(quit_now){
737
gnutls_deinit(*session);
738
return -1;
739
}
740
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
741
if(ret != GNUTLS_E_SUCCESS){
742
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
743
safer_gnutls_strerror(ret));
744
gnutls_deinit(*session);
476
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
477
mc->cred);
478
if (ret != GNUTLS_E_SUCCESS) {
479
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
480
safer_gnutls_strerror(ret));
481
gnutls_deinit (*session);
745
482
return -1;
746
483
}
747
484
748
485
/* ignore client certificate if any. */
749
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
486
gnutls_certificate_server_set_request (*session,
487
GNUTLS_CERT_IGNORE);
750
488
751
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
489
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
752
490
753
491
return 0;
754
492
}
758
496
__attribute__((unused)) const char *txt){}
759
497
760
498
/* Called when a Mandos server is found */
761
__attribute__((nonnull, warn_unused_result))
762
static int start_mandos_communication(const char *ip, in_port_t port,
499
static int start_mandos_communication(const char *ip, uint16_t port,
763
500
AvahiIfIndex if_index,
764
int af, mandos_context *mc){
765
int ret, tcp_sd = -1;
766
ssize_t sret;
767
struct sockaddr_storage to;
501
mandos_context *mc){
502
int ret, tcp_sd;
503
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
768
504
char *buffer = NULL;
769
char *decrypted_buffer = NULL;
505
char *decrypted_buffer;
770
506
size_t buffer_length = 0;
771
507
size_t buffer_capacity = 0;
508
ssize_t decrypted_buffer_size;
772
509
size_t written;
773
int retval = -1;
510
int retval = 0;
511
char interface[IF_NAMESIZE];
774
512
gnutls_session_t session;
775
int pf; /* Protocol family */
776
777
errno = 0;
778
779
if(quit_now){
780
errno = EINTR;
781
return -1;
782
}
783
784
switch(af){
785
case AF_INET6:
786
pf = PF_INET6;
787
break;
788
case AF_INET:
789
pf = PF_INET;
790
break;
791
default:
792
fprintf_plus(stderr, "Bad address family: %d\n", af);
793
errno = EINVAL;
794
return -1;
795
}
796
797
/* If the interface is specified and we have a list of interfaces */
798
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
799
/* Check if the interface is one of the interfaces we are using */
800
bool match = false;
801
{
802
char *interface = NULL;
803
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
804
interface))){
805
if(if_nametoindex(interface) == (unsigned int)if_index){
806
match = true;
807
break;
808
}
809
}
810
}
811
if(not match){
812
/* This interface does not match any in the list, so we don't
813
connect to the server */
814
if(debug){
815
char interface[IF_NAMESIZE];
816
if(if_indextoname((unsigned int)if_index, interface) == NULL){
817
perror_plus("if_indextoname");
818
} else {
819
fprintf_plus(stderr, "Skipping server on non-used interface"
820
" \"%s\"\n",
821
if_indextoname((unsigned int)if_index,
822
interface));
823
}
824
}
513
514
ret = init_gnutls_session (mc, &session);
515
if (ret != 0){
516
return -1;
517
}
518
519
if(debug){
520
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
521
"\n", ip, port);
522
}
523
524
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
525
if(tcp_sd < 0) {
526
perror("socket");
527
return -1;
528
}
529
530
if(debug){
531
if(if_indextoname((unsigned int)if_index, interface) == NULL){
532
perror("if_indextoname");
825
533
return -1;
826
534
}
827
}
828
829
ret = init_gnutls_session(&session, mc);
830
if(ret != 0){
831
return -1;
832
}
833
834
if(debug){
835
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
836
PRIuMAX "\n", ip, (uintmax_t)port);
837
}
838
839
tcp_sd = socket(pf, SOCK_STREAM, 0);
840
if(tcp_sd < 0){
841
int e = errno;
842
perror_plus("socket");
843
errno = e;
844
goto mandos_end;
845
}
846
847
if(quit_now){
848
errno = EINTR;
849
goto mandos_end;
535
fprintf(stderr, "Binding to interface %s\n", interface);
850
536
}
851
537
852
538
memset(&to, 0, sizeof(to));
853
if(af == AF_INET6){
854
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
855
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
856
} else { /* IPv4 */
857
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
858
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
859
}
860
if(ret < 0 ){
861
int e = errno;
862
perror_plus("inet_pton");
863
errno = e;
864
goto mandos_end;
539
to.in6.sin6_family = AF_INET6;
540
/* It would be nice to have a way to detect if we were passed an
541
IPv4 address here. Now we assume an IPv6 address. */
542
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
543
if (ret < 0 ){
544
perror("inet_pton");
545
return -1;
865
546
}
866
547
if(ret == 0){
867
int e = errno;
868
fprintf_plus(stderr, "Bad address: %s\n", ip);
869
errno = e;
870
goto mandos_end;
871
}
872
if(af == AF_INET6){
873
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
874
if(IN6_IS_ADDR_LINKLOCAL
875
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
876
if(if_index == AVAHI_IF_UNSPEC){
877
fprintf_plus(stderr, "An IPv6 link-local address is"
878
" incomplete without a network interface\n");
879
errno = EINVAL;
880
goto mandos_end;
881
}
882
/* Set the network interface number as scope */
883
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
884
}
885
} else {
886
((struct sockaddr_in *)&to)->sin_port = htons(port);
887
}
548
fprintf(stderr, "Bad address: %s\n", ip);
549
return -1;
550
}
551
to.in6.sin6_port = htons(port); /* Spurious warning */
888
552
889
if(quit_now){
890
errno = EINTR;
891
goto mandos_end;
892
}
553
to.in6.sin6_scope_id = (uint32_t)if_index;
893
554
894
555
if(debug){
895
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
896
char interface[IF_NAMESIZE];
897
if(if_indextoname((unsigned int)if_index, interface) == NULL){
898
perror_plus("if_indextoname");
899
} else {
900
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
901
"\n", ip, interface, (uintmax_t)port);
556
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
557
port);
558
char addrstr[INET6_ADDRSTRLEN] = "";
559
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
560
sizeof(addrstr)) == NULL){
561
perror("inet_ntop");
562
} else {
563
if(strcmp(addrstr, ip) != 0){
564
fprintf(stderr, "Canonical address form: %s\n", addrstr);
902
565
}
903
} else {
904
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
905
ip, (uintmax_t)port);
906
}
907
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
908
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
909
if(af == AF_INET6){
910
ret = getnameinfo((struct sockaddr *)&to,
911
sizeof(struct sockaddr_in6),
912
addrstr, sizeof(addrstr), NULL, 0,
913
NI_NUMERICHOST);
914
} else {
915
ret = getnameinfo((struct sockaddr *)&to,
916
sizeof(struct sockaddr_in),
917
addrstr, sizeof(addrstr), NULL, 0,
918
NI_NUMERICHOST);
919
}
920
if(ret == EAI_SYSTEM){
921
perror_plus("getnameinfo");
922
} else if(ret != 0) {
923
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
924
} else if(strcmp(addrstr, ip) != 0){
925
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
926
}
927
}
928
929
if(quit_now){
930
errno = EINTR;
931
goto mandos_end;
932
}
933
934
if(af == AF_INET6){
935
ret = connect(tcp_sd, (struct sockaddr *)&to,
936
sizeof(struct sockaddr_in6));
937
} else {
938
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
939
sizeof(struct sockaddr_in));
940
}
941
if(ret < 0){
942
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
943
int e = errno;
944
perror_plus("connect");
945
errno = e;
946
}
947
goto mandos_end;
948
}
949
950
if(quit_now){
951
errno = EINTR;
952
goto mandos_end;
566
}
567
}
568
569
ret = connect(tcp_sd, &to.in, sizeof(to));
570
if (ret < 0){
571
perror("connect");
572
return -1;
953
573
}
954
574
955
575
const char *out = mandos_protocol_version;
956
576
written = 0;
957
while(true){
577
while (true){
958
578
size_t out_size = strlen(out);
959
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
960
out_size - written));
961
if(ret == -1){
962
int e = errno;
963
perror_plus("write");
964
errno = e;
579
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
580
out_size - written));
581
if (ret == -1){
582
perror("write");
583
retval = -1;
965
584
goto mandos_end;
966
585
}
967
586
written += (size_t)ret;
968
587
if(written < out_size){
969
588
continue;
970
589
} else {
971
if(out == mandos_protocol_version){
590
if (out == mandos_protocol_version){
972
591
written = 0;
973
592
out = "\r\n";
974
593
} else {
975
594
break;
976
595
}
977
596
}
978
979
if(quit_now){
980
errno = EINTR;
981
goto mandos_end;
982
}
983
597
}
984
598
985
599
if(debug){
986
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
987
}
988
989
if(quit_now){
990
errno = EINTR;
991
goto mandos_end;
992
}
993
994
/* This casting via intptr_t is to eliminate warning about casting
995
an int to a pointer type. This is exactly how the GnuTLS Guile
996
function "set-session-transport-fd!" does it. */
997
gnutls_transport_set_ptr(session,
998
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
999
1000
if(quit_now){
1001
errno = EINTR;
1002
goto mandos_end;
1003
}
1004
1005
do {
1006
ret = gnutls_handshake(session);
1007
if(quit_now){
1008
errno = EINTR;
1009
goto mandos_end;
1010
}
600
fprintf(stderr, "Establishing TLS session with %s\n", ip);
601
}
602
603
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
604
605
do{
606
ret = gnutls_handshake (session);
1011
607
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1012
608
1013
if(ret != GNUTLS_E_SUCCESS){
609
if (ret != GNUTLS_E_SUCCESS){
1014
610
if(debug){
1015
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
1016
gnutls_perror(ret);
611
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
612
gnutls_perror (ret);
1017
613
}
1018
errno = EPROTO;
614
retval = -1;
1019
615
goto mandos_end;
1020
616
}
1021
617
1022
618
/* Read OpenPGP packet that contains the wanted password */
1023
619
1024
620
if(debug){
1025
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1026
" %s\n", ip);
621
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
622
ip);
1027
623
}
1028
624
1029
625
while(true){
1030
1031
if(quit_now){
1032
errno = EINTR;
1033
goto mandos_end;
1034
}
1035
1036
buffer_capacity = incbuffer(&buffer, buffer_length,
1037
buffer_capacity);
1038
if(buffer_capacity == 0){
1039
int e = errno;
1040
perror_plus("incbuffer");
1041
errno = e;
1042
goto mandos_end;
1043
}
1044
1045
if(quit_now){
1046
errno = EINTR;
1047
goto mandos_end;
1048
}
1049
1050
sret = gnutls_record_recv(session, buffer+buffer_length,
1051
BUFFER_SIZE);
1052
if(sret == 0){
626
buffer_capacity = adjustbuffer(&buffer, buffer_length,
627
buffer_capacity);
628
if (buffer_capacity == 0){
629
perror("adjustbuffer");
630
retval = -1;
631
goto mandos_end;
632
}
633
634
ret = gnutls_record_recv(session, buffer+buffer_length,
635
BUFFER_SIZE);
636
if (ret == 0){
1053
637
break;
1054
638
}
1055
if(sret < 0){
1056
switch(sret){
639
if (ret < 0){
640
switch(ret){
1057
641
case GNUTLS_E_INTERRUPTED:
1058
642
case GNUTLS_E_AGAIN:
1059
643
break;
1060
644
case GNUTLS_E_REHANDSHAKE:
1061
do {
1062
ret = gnutls_handshake(session);
1063
1064
if(quit_now){
1065
errno = EINTR;
1066
goto mandos_end;
1067
}
645
do{
646
ret = gnutls_handshake (session);
1068
647
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1069
if(ret < 0){
1070
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1071
"***\n");
1072
gnutls_perror(ret);
1073
errno = EPROTO;
648
if (ret < 0){
649
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
650
gnutls_perror (ret);
651
retval = -1;
1074
652
goto mandos_end;
1075
653
}
1076
654
break;
1077
655
default:
1078
fprintf_plus(stderr, "Unknown error while reading data from"
1079
" encrypted session with Mandos server\n");
1080
gnutls_bye(session, GNUTLS_SHUT_RDWR);
1081
errno = EIO;
656
fprintf(stderr, "Unknown error while reading data from"
657
" encrypted session with Mandos server\n");
658
retval = -1;
659
gnutls_bye (session, GNUTLS_SHUT_RDWR);
1082
660
goto mandos_end;
1083
661
}
1084
662
} else {
1085
buffer_length += (size_t) sret;
663
buffer_length += (size_t) ret;
1086
664
}
1087
665
}
1088
666
1089
667
if(debug){
1090
fprintf_plus(stderr, "Closing TLS session\n");
1091
}
1092
1093
if(quit_now){
1094
errno = EINTR;
1095
goto mandos_end;
1096
}
1097
1098
do {
1099
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
1100
if(quit_now){
1101
errno = EINTR;
1102
goto mandos_end;
1103
}
1104
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1105
1106
if(buffer_length > 0){
1107
ssize_t decrypted_buffer_size;
1108
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1109
&decrypted_buffer, mc);
1110
if(decrypted_buffer_size >= 0){
1111
668
fprintf(stderr, "Closing TLS session\n");
669
}
670
671
gnutls_bye (session, GNUTLS_SHUT_RDWR);
672
673
if (buffer_length > 0){
674
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
675
buffer_length,
676
&decrypted_buffer);
677
if (decrypted_buffer_size >= 0){
1112
678
written = 0;
1113
679
while(written < (size_t) decrypted_buffer_size){
1114
if(quit_now){
1115
errno = EINTR;
1116
goto mandos_end;
1117
}
1118
1119
ret = (int)fwrite(decrypted_buffer + written, 1,
1120
(size_t)decrypted_buffer_size - written,
1121
stdout);
680
ret = (int)fwrite (decrypted_buffer + written, 1,
681
(size_t)decrypted_buffer_size - written,
682
stdout);
1122
683
if(ret == 0 and ferror(stdout)){
1123
int e = errno;
1124
684
if(debug){
1125
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1126
strerror(errno));
685
fprintf(stderr, "Error writing encrypted data: %s\n",
686
strerror(errno));
1127
687
}
1128
errno = e;
1129
goto mandos_end;
688
retval = -1;
689
break;
1130
690
}
1131
691
written += (size_t)ret;
1132
692
}
1133
retval = 0;
693
free(decrypted_buffer);
694
} else {
695
retval = -1;
1134
696
}
697
} else {
698
retval = -1;
1135
699
}
1136
700
1137
701
/* Shutdown procedure */
1138
702
1139
703
mandos_end:
1140
{
1141
int e = errno;
1142
free(decrypted_buffer);
1143
free(buffer);
1144
if(tcp_sd >= 0){
1145
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1146
}
1147
if(ret == -1){
1148
if(e == 0){
1149
e = errno;
1150
}
1151
perror_plus("close");
1152
}
1153
gnutls_deinit(session);
1154
errno = e;
1155
if(quit_now){
1156
errno = EINTR;
1157
retval = -1;
1158
}
704
free(buffer);
705
ret = TEMP_FAILURE_RETRY(close(tcp_sd));
706
if(ret == -1){
707
perror("close");
1159
708
}
709
gnutls_deinit (session);
1160
710
return retval;
1161
711
}
1162
712
1163
__attribute__((nonnull))
1164
713
static void resolve_callback(AvahiSServiceResolver *r,
1165
714
AvahiIfIndex interface,
1166
AvahiProtocol proto,
715
AVAHI_GCC_UNUSED AvahiProtocol protocol,
1167
716
AvahiResolverEvent event,
1168
717
const char *name,
1169
718
const char *type,
1174
723
AVAHI_GCC_UNUSED AvahiStringList *txt,
1175
724
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1176
725
flags,
1177
void *mc){
1178
if(r == NULL){
1179
return;
1180
}
726
void* userdata) {
727
mandos_context *mc = userdata;
728
assert(r);
1181
729
1182
730
/* Called whenever a service has been resolved successfully or
1183
731
timed out */
1184
732
1185
if(quit_now){
1186
avahi_s_service_resolver_free(r);
1187
return;
1188
}
1189
1190
switch(event){
733
switch (event) {
1191
734
default:
1192
735
case AVAHI_RESOLVER_FAILURE:
1193
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1194
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1195
domain,
1196
avahi_strerror(avahi_server_errno
1197
(((mandos_context*)mc)->server)));
736
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
737
" of type '%s' in domain '%s': %s\n", name, type, domain,
738
avahi_strerror(avahi_server_errno(mc->server)));
1198
739
break;
1199
740
1200
741
case AVAHI_RESOLVER_FOUND:
1202
743
char ip[AVAHI_ADDRESS_STR_MAX];
1203
744
avahi_address_snprint(ip, sizeof(ip), address);
1204
745
if(debug){
1205
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1206
PRIdMAX ") on port %" PRIu16 "\n", name,
1207
host_name, ip, (intmax_t)interface, port);
746
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
747
PRIu16 ") on port %d\n", name, host_name, ip,
748
interface, port);
1208
749
}
1209
int ret = start_mandos_communication(ip, (in_port_t)port,
1210
interface,
1211
avahi_proto_to_af(proto),
1212
mc);
1213
if(ret == 0){
1214
avahi_simple_poll_quit(simple_poll);
1215
} else {
1216
if(not add_server(ip, (in_port_t)port, interface,
1217
avahi_proto_to_af(proto),
1218
&((mandos_context*)mc)->current_server)){
1219
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1220
" list\n", name);
1221
}
750
int ret = start_mandos_communication(ip, port, interface, mc);
751
if (ret == 0){
752
avahi_simple_poll_quit(mc->simple_poll);
1222
753
}
1223
754
}
1224
755
}
1225
756
avahi_s_service_resolver_free(r);
1226
757
}
1227
758
1228
static void browse_callback(AvahiSServiceBrowser *b,
1229
AvahiIfIndex interface,
1230
AvahiProtocol protocol,
1231
AvahiBrowserEvent event,
1232
const char *name,
1233
const char *type,
1234
const char *domain,
1235
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1236
flags,
1237
void *mc){
1238
if(b == NULL){
1239
return;
1240
}
759
static void browse_callback( AvahiSServiceBrowser *b,
760
AvahiIfIndex interface,
761
AvahiProtocol protocol,
762
AvahiBrowserEvent event,
763
const char *name,
764
const char *type,
765
const char *domain,
766
AVAHI_GCC_UNUSED AvahiLookupResultFlags
767
flags,
768
void* userdata) {
769
mandos_context *mc = userdata;
770
assert(b);
1241
771
1242
772
/* Called whenever a new services becomes available on the LAN or
1243
773
is removed from the LAN */
1244
774
1245
if(quit_now){
1246
return;
1247
}
1248
1249
switch(event){
775
switch (event) {
1250
776
default:
1251
777
case AVAHI_BROWSER_FAILURE:
1252
778
1253
fprintf_plus(stderr, "(Avahi browser) %s\n",
1254
avahi_strerror(avahi_server_errno
1255
(((mandos_context*)mc)->server)));
1256
avahi_simple_poll_quit(simple_poll);
779
fprintf(stderr, "(Avahi browser) %s\n",
780
avahi_strerror(avahi_server_errno(mc->server)));
781
avahi_simple_poll_quit(mc->simple_poll);
1257
782
return;
1258
783
1259
784
case AVAHI_BROWSER_NEW:
1262
787
the callback function is called the Avahi server will free the
1263
788
resolver for us. */
1264
789
1265
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1266
interface, protocol, name, type,
1267
domain, protocol, 0,
1268
resolve_callback, mc) == NULL)
1269
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1270
" %s\n", name,
1271
avahi_strerror(avahi_server_errno
1272
(((mandos_context*)mc)->server)));
790
if (!(avahi_s_service_resolver_new(mc->server, interface,
791
protocol, name, type, domain,
792
AVAHI_PROTO_INET6, 0,
793
resolve_callback, mc)))
794
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
795
name, avahi_strerror(avahi_server_errno(mc->server)));
1273
796
break;
1274
797
1275
798
case AVAHI_BROWSER_REMOVE:
1278
801
case AVAHI_BROWSER_ALL_FOR_NOW:
1279
802
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1280
803
if(debug){
1281
fprintf_plus(stderr, "No Mandos server found, still"
1282
" searching...\n");
804
fprintf(stderr, "No Mandos server found, still searching...\n");
1283
805
}
1284
806
break;
1285
807
}
1286
808
}
1287
809
1288
/* Signal handler that stops main loop after SIGTERM */
1289
static void handle_sigterm(int sig){
1290
if(quit_now){
1291
return;
1292
}
1293
quit_now = 1;
1294
signal_received = sig;
1295
int old_errno = errno;
1296
/* set main loop to exit */
1297
if(simple_poll != NULL){
1298
avahi_simple_poll_quit(simple_poll);
1299
}
1300
errno = old_errno;
1301
}
1302
1303
__attribute__((nonnull, warn_unused_result))
1304
bool get_flags(const char *ifname, struct ifreq *ifr){
1305
int ret;
1306
error_t ret_errno;
1307
1308
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1309
if(s < 0){
1310
ret_errno = errno;
1311
perror_plus("socket");
1312
errno = ret_errno;
1313
return false;
1314
}
1315
strcpy(ifr->ifr_name, ifname);
1316
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1317
if(ret == -1){
1318
if(debug){
1319
ret_errno = errno;
1320
perror_plus("ioctl SIOCGIFFLAGS");
1321
errno = ret_errno;
1322
}
1323
return false;
1324
}
1325
return true;
1326
}
1327
1328
__attribute__((nonnull, warn_unused_result))
1329
bool good_flags(const char *ifname, const struct ifreq *ifr){
1330
1331
/* Reject the loopback device */
1332
if(ifr->ifr_flags & IFF_LOOPBACK){
1333
if(debug){
1334
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1335
ifname);
1336
}
1337
return false;
1338
}
1339
/* Accept point-to-point devices only if connect_to is specified */
1340
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1341
if(debug){
1342
fprintf_plus(stderr, "Accepting point-to-point interface"
1343
" \"%s\"\n", ifname);
1344
}
1345
return true;
1346
}
1347
/* Otherwise, reject non-broadcast-capable devices */
1348
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1349
if(debug){
1350
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1351
" \"%s\"\n", ifname);
1352
}
1353
return false;
1354
}
1355
/* Reject non-ARP interfaces (including dummy interfaces) */
1356
if(ifr->ifr_flags & IFF_NOARP){
1357
if(debug){
1358
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1359
ifname);
1360
}
1361
return false;
1362
}
1363
1364
/* Accept this device */
1365
if(debug){
1366
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1367
}
1368
return true;
1369
}
1370
1371
/*
1372
* This function determines if a directory entry in /sys/class/net
1373
* corresponds to an acceptable network device.
1374
* (This function is passed to scandir(3) as a filter function.)
1375
*/
1376
__attribute__((nonnull, warn_unused_result))
1377
int good_interface(const struct dirent *if_entry){
1378
if(if_entry->d_name[0] == '.'){
1379
return 0;
1380
}
1381
1382
struct ifreq ifr;
1383
if(not get_flags(if_entry->d_name, &ifr)){
1384
if(debug){
1385
fprintf_plus(stderr, "Failed to get flags for interface "
1386
"\"%s\"\n", if_entry->d_name);
1387
}
1388
return 0;
1389
}
1390
1391
if(not good_flags(if_entry->d_name, &ifr)){
1392
return 0;
1393
}
1394
return 1;
1395
}
1396
1397
/*
1398
* This function determines if a network interface is up.
1399
*/
1400
__attribute__((nonnull, warn_unused_result))
1401
bool interface_is_up(const char *interface){
1402
struct ifreq ifr;
1403
if(not get_flags(interface, &ifr)){
1404
if(debug){
1405
fprintf_plus(stderr, "Failed to get flags for interface "
1406
"\"%s\"\n", interface);
1407
}
1408
return false;
1409
}
1410
1411
return (bool)(ifr.ifr_flags & IFF_UP);
1412
}
1413
1414
/*
1415
* This function determines if a network interface is running
1416
*/
1417
__attribute__((nonnull, warn_unused_result))
1418
bool interface_is_running(const char *interface){
1419
struct ifreq ifr;
1420
if(not get_flags(interface, &ifr)){
1421
if(debug){
1422
fprintf_plus(stderr, "Failed to get flags for interface "
1423
"\"%s\"\n", interface);
1424
}
1425
return false;
1426
}
1427
1428
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1429
}
1430
1431
__attribute__((nonnull, pure, warn_unused_result))
1432
int notdotentries(const struct dirent *direntry){
1433
/* Skip "." and ".." */
1434
if(direntry->d_name[0] == '.'
1435
and (direntry->d_name[1] == '\0'
1436
or (direntry->d_name[1] == '.'
1437
and direntry->d_name[2] == '\0'))){
1438
return 0;
1439
}
1440
return 1;
1441
}
1442
1443
/* Is this directory entry a runnable program? */
1444
__attribute__((nonnull, warn_unused_result))
1445
int runnable_hook(const struct dirent *direntry){
1446
int ret;
1447
size_t sret;
1448
struct stat st;
1449
1450
if((direntry->d_name)[0] == '\0'){
1451
/* Empty name? */
1452
return 0;
1453
}
1454
1455
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1456
"abcdefghijklmnopqrstuvwxyz"
1457
"0123456789"
1458
"_.-");
1459
if((direntry->d_name)[sret] != '\0'){
1460
/* Contains non-allowed characters */
1461
if(debug){
1462
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1463
direntry->d_name);
1464
}
1465
return 0;
1466
}
1467
1468
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1469
if(ret == -1){
1470
if(debug){
1471
perror_plus("Could not stat hook");
1472
}
1473
return 0;
1474
}
1475
if(not (S_ISREG(st.st_mode))){
1476
/* Not a regular file */
1477
if(debug){
1478
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1479
direntry->d_name);
1480
}
1481
return 0;
1482
}
1483
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1484
/* Not executable */
1485
if(debug){
1486
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1487
direntry->d_name);
1488
}
1489
return 0;
1490
}
1491
if(debug){
1492
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1493
direntry->d_name);
1494
}
1495
return 1;
1496
}
1497
1498
__attribute__((nonnull, warn_unused_result))
1499
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1500
mandos_context *mc){
1501
int ret;
1502
struct timespec now;
1503
struct timespec waited_time;
1504
intmax_t block_time;
1505
1506
while(true){
1507
if(mc->current_server == NULL){
1508
if(debug){
1509
fprintf_plus(stderr, "Wait until first server is found."
1510
" No timeout!\n");
1511
}
1512
ret = avahi_simple_poll_iterate(s, -1);
1513
} else {
1514
if(debug){
1515
fprintf_plus(stderr, "Check current_server if we should run"
1516
" it, or wait\n");
1517
}
1518
/* the current time */
1519
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1520
if(ret == -1){
1521
perror_plus("clock_gettime");
1522
return -1;
1523
}
1524
/* Calculating in ms how long time between now and server
1525
who we visted longest time ago. Now - last seen. */
1526
waited_time.tv_sec = (now.tv_sec
1527
- mc->current_server->last_seen.tv_sec);
1528
waited_time.tv_nsec = (now.tv_nsec
1529
- mc->current_server->last_seen.tv_nsec);
1530
/* total time is 10s/10,000ms.
1531
Converting to s from ms by dividing by 1,000,
1532
and ns to ms by dividing by 1,000,000. */
1533
block_time = ((retry_interval
1534
- ((intmax_t)waited_time.tv_sec * 1000))
1535
- ((intmax_t)waited_time.tv_nsec / 1000000));
1536
1537
if(debug){
1538
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1539
block_time);
1540
}
1541
1542
if(block_time <= 0){
1543
ret = start_mandos_communication(mc->current_server->ip,
1544
mc->current_server->port,
1545
mc->current_server->if_index,
1546
mc->current_server->af, mc);
1547
if(ret == 0){
1548
avahi_simple_poll_quit(s);
1549
return 0;
1550
}
1551
ret = clock_gettime(CLOCK_MONOTONIC,
1552
&mc->current_server->last_seen);
1553
if(ret == -1){
1554
perror_plus("clock_gettime");
1555
return -1;
1556
}
1557
mc->current_server = mc->current_server->next;
1558
block_time = 0; /* Call avahi to find new Mandos
1559
servers, but don't block */
1560
}
1561
1562
ret = avahi_simple_poll_iterate(s, (int)block_time);
1563
}
1564
if(ret != 0){
1565
if(ret > 0 or errno != EINTR){
1566
return (ret != 1) ? ret : 0;
1567
}
1568
}
1569
}
1570
}
1571
1572
/* Set effective uid to 0, return errno */
1573
__attribute__((warn_unused_result))
1574
error_t raise_privileges(void){
1575
error_t old_errno = errno;
1576
error_t ret_errno = 0;
1577
if(seteuid(0) == -1){
1578
ret_errno = errno;
1579
}
1580
errno = old_errno;
1581
return ret_errno;
1582
}
1583
1584
/* Set effective and real user ID to 0. Return errno. */
1585
__attribute__((warn_unused_result))
1586
error_t raise_privileges_permanently(void){
1587
error_t old_errno = errno;
1588
error_t ret_errno = raise_privileges();
1589
if(ret_errno != 0){
1590
errno = old_errno;
1591
return ret_errno;
1592
}
1593
if(setuid(0) == -1){
1594
ret_errno = errno;
1595
}
1596
errno = old_errno;
1597
return ret_errno;
1598
}
1599
1600
/* Set effective user ID to unprivileged saved user ID */
1601
__attribute__((warn_unused_result))
1602
error_t lower_privileges(void){
1603
error_t old_errno = errno;
1604
error_t ret_errno = 0;
1605
if(seteuid(uid) == -1){
1606
ret_errno = errno;
1607
}
1608
errno = old_errno;
1609
return ret_errno;
1610
}
1611
1612
/* Lower privileges permanently */
1613
__attribute__((warn_unused_result))
1614
error_t lower_privileges_permanently(void){
1615
error_t old_errno = errno;
1616
error_t ret_errno = 0;
1617
if(setuid(uid) == -1){
1618
ret_errno = errno;
1619
}
1620
errno = old_errno;
1621
return ret_errno;
1622
}
1623
1624
__attribute__((nonnull))
1625
void run_network_hooks(const char *mode, const char *interface,
1626
const float delay){
1627
struct dirent **direntries = NULL;
1628
if(hookdir_fd == -1){
1629
hookdir_fd = open(hookdir, O_RDONLY);
1630
if(hookdir_fd == -1){
1631
if(errno == ENOENT){
1632
if(debug){
1633
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1634
" found\n", hookdir);
1635
}
1636
} else {
1637
perror_plus("open");
1638
}
1639
return;
1640
}
1641
}
1642
#ifdef __GLIBC__
1643
#if __GLIBC_PREREQ(2, 15)
1644
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1645
runnable_hook, alphasort);
1646
#else /* not __GLIBC_PREREQ(2, 15) */
1647
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1648
alphasort);
1649
#endif /* not __GLIBC_PREREQ(2, 15) */
1650
#else /* not __GLIBC__ */
1651
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1652
alphasort);
1653
#endif /* not __GLIBC__ */
1654
if(numhooks == -1){
1655
perror_plus("scandir");
1656
return;
1657
}
1658
struct dirent *direntry;
1659
int ret;
1660
int devnull = open("/dev/null", O_RDONLY);
1661
for(int i = 0; i < numhooks; i++){
1662
direntry = direntries[i];
1663
if(debug){
1664
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1665
direntry->d_name);
1666
}
1667
pid_t hook_pid = fork();
1668
if(hook_pid == 0){
1669
/* Child */
1670
/* Raise privileges */
1671
errno = raise_privileges_permanently();
1672
if(errno != 0){
1673
perror_plus("Failed to raise privileges");
1674
_exit(EX_NOPERM);
1675
}
1676
/* Set group */
1677
errno = 0;
1678
ret = setgid(0);
1679
if(ret == -1){
1680
perror_plus("setgid");
1681
_exit(EX_NOPERM);
1682
}
1683
/* Reset supplementary groups */
1684
errno = 0;
1685
ret = setgroups(0, NULL);
1686
if(ret == -1){
1687
perror_plus("setgroups");
1688
_exit(EX_NOPERM);
1689
}
1690
ret = dup2(devnull, STDIN_FILENO);
1691
if(ret == -1){
1692
perror_plus("dup2(devnull, STDIN_FILENO)");
1693
_exit(EX_OSERR);
1694
}
1695
ret = close(devnull);
1696
if(ret == -1){
1697
perror_plus("close");
1698
_exit(EX_OSERR);
1699
}
1700
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1701
if(ret == -1){
1702
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1703
_exit(EX_OSERR);
1704
}
1705
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1706
if(ret == -1){
1707
perror_plus("setenv");
1708
_exit(EX_OSERR);
1709
}
1710
ret = setenv("DEVICE", interface, 1);
1711
if(ret == -1){
1712
perror_plus("setenv");
1713
_exit(EX_OSERR);
1714
}
1715
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1716
if(ret == -1){
1717
perror_plus("setenv");
1718
_exit(EX_OSERR);
1719
}
1720
ret = setenv("MODE", mode, 1);
1721
if(ret == -1){
1722
perror_plus("setenv");
1723
_exit(EX_OSERR);
1724
}
1725
char *delaystring;
1726
ret = asprintf(&delaystring, "%f", (double)delay);
1727
if(ret == -1){
1728
perror_plus("asprintf");
1729
_exit(EX_OSERR);
1730
}
1731
ret = setenv("DELAY", delaystring, 1);
1732
if(ret == -1){
1733
free(delaystring);
1734
perror_plus("setenv");
1735
_exit(EX_OSERR);
1736
}
1737
free(delaystring);
1738
if(connect_to != NULL){
1739
ret = setenv("CONNECT", connect_to, 1);
1740
if(ret == -1){
1741
perror_plus("setenv");
1742
_exit(EX_OSERR);
1743
}
1744
}
1745
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
1746
if(hook_fd == -1){
1747
perror_plus("openat");
1748
_exit(EXIT_FAILURE);
1749
}
1750
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1751
perror_plus("close");
1752
_exit(EXIT_FAILURE);
1753
}
1754
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1755
environ) == -1){
1756
perror_plus("fexecve");
1757
_exit(EXIT_FAILURE);
1758
}
1759
} else {
1760
if(hook_pid == -1){
1761
perror_plus("fork");
1762
free(direntry);
1763
continue;
1764
}
1765
int status;
1766
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1767
perror_plus("waitpid");
1768
free(direntry);
1769
continue;
1770
}
1771
if(WIFEXITED(status)){
1772
if(WEXITSTATUS(status) != 0){
1773
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1774
" with status %d\n", direntry->d_name,
1775
WEXITSTATUS(status));
1776
free(direntry);
1777
continue;
1778
}
1779
} else if(WIFSIGNALED(status)){
1780
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1781
" signal %d\n", direntry->d_name,
1782
WTERMSIG(status));
1783
free(direntry);
1784
continue;
1785
} else {
1786
fprintf_plus(stderr, "Warning: network hook \"%s\""
1787
" crashed\n", direntry->d_name);
1788
free(direntry);
1789
continue;
1790
}
1791
}
1792
if(debug){
1793
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1794
direntry->d_name);
1795
}
1796
free(direntry);
1797
}
1798
free(direntries);
1799
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1800
perror_plus("close");
1801
} else {
1802
hookdir_fd = -1;
1803
}
1804
close(devnull);
1805
}
1806
1807
__attribute__((nonnull, warn_unused_result))
1808
error_t bring_up_interface(const char *const interface,
1809
const float delay){
1810
error_t old_errno = errno;
1811
int ret;
1812
struct ifreq network;
1813
unsigned int if_index = if_nametoindex(interface);
1814
if(if_index == 0){
1815
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1816
errno = old_errno;
1817
return ENXIO;
1818
}
1819
1820
if(quit_now){
1821
errno = old_errno;
1822
return EINTR;
1823
}
1824
1825
if(not interface_is_up(interface)){
1826
error_t ret_errno = 0, ioctl_errno = 0;
1827
if(not get_flags(interface, &network)){
1828
ret_errno = errno;
1829
fprintf_plus(stderr, "Failed to get flags for interface "
1830
"\"%s\"\n", interface);
1831
errno = old_errno;
1832
return ret_errno;
1833
}
1834
network.ifr_flags |= IFF_UP; /* set flag */
1835
1836
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1837
if(sd == -1){
1838
ret_errno = errno;
1839
perror_plus("socket");
1840
errno = old_errno;
1841
return ret_errno;
1842
}
1843
1844
if(quit_now){
1845
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1846
if(ret == -1){
1847
perror_plus("close");
1848
}
1849
errno = old_errno;
1850
return EINTR;
1851
}
1852
1853
if(debug){
1854
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1855
interface);
1856
}
1857
1858
/* Raise privileges */
1859
ret_errno = raise_privileges();
1860
if(ret_errno != 0){
1861
errno = ret_errno;
1862
perror_plus("Failed to raise privileges");
1863
}
1864
1865
#ifdef __linux__
1866
int ret_linux;
1867
bool restore_loglevel = false;
1868
if(ret_errno == 0){
1869
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1870
messages about the network interface to mess up the prompt */
1871
ret_linux = klogctl(8, NULL, 5);
1872
if(ret_linux == -1){
1873
perror_plus("klogctl");
1874
} else {
1875
restore_loglevel = true;
1876
}
1877
}
1878
#endif /* __linux__ */
1879
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1880
ioctl_errno = errno;
1881
#ifdef __linux__
1882
if(restore_loglevel){
1883
ret_linux = klogctl(7, NULL, 0);
1884
if(ret_linux == -1){
1885
perror_plus("klogctl");
1886
}
1887
}
1888
#endif /* __linux__ */
1889
1890
/* If raise_privileges() succeeded above */
1891
if(ret_errno == 0){
1892
/* Lower privileges */
1893
ret_errno = lower_privileges();
1894
if(ret_errno != 0){
1895
errno = ret_errno;
1896
perror_plus("Failed to lower privileges");
1897
}
1898
}
1899
1900
/* Close the socket */
1901
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1902
if(ret == -1){
1903
perror_plus("close");
1904
}
1905
1906
if(ret_setflags == -1){
1907
errno = ioctl_errno;
1908
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1909
errno = old_errno;
1910
return ioctl_errno;
1911
}
1912
} else if(debug){
1913
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1914
interface);
1915
}
1916
1917
/* Sleep checking until interface is running.
1918
Check every 0.25s, up to total time of delay */
1919
for(int i=0; i < delay * 4; i++){
1920
if(interface_is_running(interface)){
1921
break;
1922
}
1923
struct timespec sleeptime = { .tv_nsec = 250000000 };
1924
ret = nanosleep(&sleeptime, NULL);
1925
if(ret == -1 and errno != EINTR){
1926
perror_plus("nanosleep");
1927
}
1928
}
1929
1930
errno = old_errno;
1931
return 0;
1932
}
1933
1934
__attribute__((nonnull, warn_unused_result))
1935
error_t take_down_interface(const char *const interface){
1936
error_t old_errno = errno;
1937
struct ifreq network;
1938
unsigned int if_index = if_nametoindex(interface);
1939
if(if_index == 0){
1940
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1941
errno = old_errno;
1942
return ENXIO;
1943
}
1944
if(interface_is_up(interface)){
1945
error_t ret_errno = 0, ioctl_errno = 0;
1946
if(not get_flags(interface, &network) and debug){
1947
ret_errno = errno;
1948
fprintf_plus(stderr, "Failed to get flags for interface "
1949
"\"%s\"\n", interface);
1950
errno = old_errno;
1951
return ret_errno;
1952
}
1953
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1954
1955
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1956
if(sd == -1){
1957
ret_errno = errno;
1958
perror_plus("socket");
1959
errno = old_errno;
1960
return ret_errno;
1961
}
1962
1963
if(debug){
1964
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1965
interface);
1966
}
1967
1968
/* Raise privileges */
1969
ret_errno = raise_privileges();
1970
if(ret_errno != 0){
1971
errno = ret_errno;
1972
perror_plus("Failed to raise privileges");
1973
}
1974
1975
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1976
ioctl_errno = errno;
1977
1978
/* If raise_privileges() succeeded above */
1979
if(ret_errno == 0){
1980
/* Lower privileges */
1981
ret_errno = lower_privileges();
1982
if(ret_errno != 0){
1983
errno = ret_errno;
1984
perror_plus("Failed to lower privileges");
1985
}
1986
}
1987
1988
/* Close the socket */
1989
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1990
if(ret == -1){
1991
perror_plus("close");
1992
}
1993
1994
if(ret_setflags == -1){
1995
errno = ioctl_errno;
1996
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1997
errno = old_errno;
1998
return ioctl_errno;
1999
}
2000
} else if(debug){
2001
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2002
interface);
2003
}
2004
2005
errno = old_errno;
2006
return 0;
2007
}
2008
2009
810
int main(int argc, char *argv[]){
2010
mandos_context mc = { .server = NULL, .dh_bits = 0,
2011
.priority = "SECURE256:!CTYPE-X.509:"
2012
"+CTYPE-OPENPGP:!RSA", .current_server = NULL,
2013
.interfaces = NULL, .interfaces_size = 0 };
2014
AvahiSServiceBrowser *sb = NULL;
2015
error_t ret_errno;
2016
int ret;
2017
intmax_t tmpmax;
2018
char *tmp;
2019
int exitcode = EXIT_SUCCESS;
2020
char *interfaces_to_take_down = NULL;
2021
size_t interfaces_to_take_down_size = 0;
2022
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2023
char old_tempdir[] = "/tmp/mandosXXXXXX";
2024
char *tempdir = NULL;
2025
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2026
const char *seckey = PATHDIR "/" SECKEY;
2027
const char *pubkey = PATHDIR "/" PUBKEY;
2028
char *interfaces_hooks = NULL;
2029
2030
bool gnutls_initialized = false;
2031
bool gpgme_initialized = false;
2032
float delay = 2.5f;
2033
double retry_interval = 10; /* 10s between trying a server and
2034
retrying the same server again */
2035
2036
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
2037
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
2038
2039
uid = getuid();
2040
gid = getgid();
2041
2042
/* Lower any group privileges we might have, just to be safe */
2043
errno = 0;
2044
ret = setgid(gid);
2045
if(ret == -1){
2046
perror_plus("setgid");
2047
}
2048
2049
/* Lower user privileges (temporarily) */
2050
errno = 0;
2051
ret = seteuid(uid);
2052
if(ret == -1){
2053
perror_plus("seteuid");
2054
}
2055
2056
if(quit_now){
2057
goto end;
2058
}
2059
2060
{
2061
struct argp_option options[] = {
2062
{ .name = "debug", .key = 128,
2063
.doc = "Debug mode", .group = 3 },
2064
{ .name = "connect", .key = 'c',
2065
.arg = "ADDRESS:PORT",
2066
.doc = "Connect directly to a specific Mandos server",
2067
.group = 1 },
2068
{ .name = "interface", .key = 'i',
2069
.arg = "NAME",
2070
.doc = "Network interface that will be used to search for"
2071
" Mandos servers",
2072
.group = 1 },
2073
{ .name = "seckey", .key = 's',
2074
.arg = "FILE",
2075
.doc = "OpenPGP secret key file base name",
2076
.group = 1 },
2077
{ .name = "pubkey", .key = 'p',
2078
.arg = "FILE",
2079
.doc = "OpenPGP public key file base name",
2080
.group = 2 },
2081
{ .name = "dh-bits", .key = 129,
2082
.arg = "BITS",
2083
.doc = "Bit length of the prime number used in the"
2084
" Diffie-Hellman key exchange",
2085
.group = 2 },
2086
{ .name = "priority", .key = 130,
2087
.arg = "STRING",
2088
.doc = "GnuTLS priority string for the TLS handshake",
2089
.group = 1 },
2090
{ .name = "delay", .key = 131,
2091
.arg = "SECONDS",
2092
.doc = "Maximum delay to wait for interface startup",
2093
.group = 2 },
2094
{ .name = "retry", .key = 132,
2095
.arg = "SECONDS",
2096
.doc = "Retry interval used when denied by the Mandos server",
2097
.group = 2 },
2098
{ .name = "network-hook-dir", .key = 133,
2099
.arg = "DIR",
2100
.doc = "Directory where network hooks are located",
2101
.group = 2 },
2102
/*
2103
* These reproduce what we would get without ARGP_NO_HELP
2104
*/
2105
{ .name = "help", .key = '?',
2106
.doc = "Give this help list", .group = -1 },
2107
{ .name = "usage", .key = -3,
2108
.doc = "Give a short usage message", .group = -1 },
2109
{ .name = "version", .key = 'V',
2110
.doc = "Print program version", .group = -1 },
2111
{ .name = NULL }
2112
};
2113
2114
error_t parse_opt(int key, char *arg,
2115
struct argp_state *state){
811
AvahiSServiceBrowser *sb = NULL;
812
int error;
813
int ret;
814
int exitcode = EXIT_SUCCESS;
815
const char *interface = "eth0";
816
struct ifreq network;
817
int sd;
818
uid_t uid;
819
gid_t gid;
820
char *connect_to = NULL;
821
char tempdir[] = "/tmp/mandosXXXXXX";
822
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
823
const char *seckey = PATHDIR "/" SECKEY;
824
const char *pubkey = PATHDIR "/" PUBKEY;
825
826
mandos_context mc = { .simple_poll = NULL, .server = NULL,
827
.dh_bits = 1024, .priority = "SECURE256"
828
":!CTYPE-X.509:+CTYPE-OPENPGP" };
829
bool gnutls_initalized = false;
830
bool gpgme_initalized = false;
831
832
{
833
struct argp_option options[] = {
834
{ .name = "debug", .key = 128,
835
.doc = "Debug mode", .group = 3 },
836
{ .name = "connect", .key = 'c',
837
.arg = "ADDRESS:PORT",
838
.doc = "Connect directly to a specific Mandos server",
839
.group = 1 },
840
{ .name = "interface", .key = 'i',
841
.arg = "NAME",
842
.doc = "Interface that will be used to search for Mandos"
843
" servers",
844
.group = 1 },
845
{ .name = "seckey", .key = 's',
846
.arg = "FILE",
847
.doc = "OpenPGP secret key file base name",
848
.group = 1 },
849
{ .name = "pubkey", .key = 'p',
850
.arg = "FILE",
851
.doc = "OpenPGP public key file base name",
852
.group = 2 },
853
{ .name = "dh-bits", .key = 129,
854
.arg = "BITS",
855
.doc = "Bit length of the prime number used in the"
856
" Diffie-Hellman key exchange",
857
.group = 2 },
858
{ .name = "priority", .key = 130,
859
.arg = "STRING",
860
.doc = "GnuTLS priority string for the TLS handshake",
861
.group = 1 },
862
{ .name = NULL }
863
};
864
865
error_t parse_opt (int key, char *arg,
866
struct argp_state *state) {
867
/* Get the INPUT argument from `argp_parse', which we know is
868
a pointer to our plugin list pointer. */
869
switch (key) {
870
case 128: /* --debug */
871
debug = true;
872
break;
873
case 'c': /* --connect */
874
connect_to = arg;
875
break;
876
case 'i': /* --interface */
877
interface = arg;
878
break;
879
case 's': /* --seckey */
880
seckey = arg;
881
break;
882
case 'p': /* --pubkey */
883
pubkey = arg;
884
break;
885
case 129: /* --dh-bits */
886
errno = 0;
887
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
888
if (errno){
889
perror("strtol");
890
exit(EXIT_FAILURE);
891
}
892
break;
893
case 130: /* --priority */
894
mc.priority = arg;
895
break;
896
case ARGP_KEY_ARG:
897
argp_usage (state);
898
case ARGP_KEY_END:
899
break;
900
default:
901
return ARGP_ERR_UNKNOWN;
902
}
903
return 0;
904
}
905
906
struct argp argp = { .options = options, .parser = parse_opt,
907
.args_doc = "",
908
.doc = "Mandos client -- Get and decrypt"
909
" passwords from a Mandos server" };
910
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
911
if (ret == ARGP_ERR_UNKNOWN){
912
fprintf(stderr, "Unknown error while parsing arguments\n");
913
exitcode = EXIT_FAILURE;
914
goto end;
915
}
916
}
917
918
/* If the interface is down, bring it up */
919
{
920
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
921
if(sd < 0) {
922
perror("socket");
923
exitcode = EXIT_FAILURE;
924
goto end;
925
}
926
strcpy(network.ifr_name, interface);
927
ret = ioctl(sd, SIOCGIFFLAGS, &network);
928
if(ret == -1){
929
perror("ioctl SIOCGIFFLAGS");
930
exitcode = EXIT_FAILURE;
931
goto end;
932
}
933
if((network.ifr_flags & IFF_UP) == 0){
934
network.ifr_flags |= IFF_UP;
935
ret = ioctl(sd, SIOCSIFFLAGS, &network);
936
if(ret == -1){
937
perror("ioctl SIOCSIFFLAGS");
938
exitcode = EXIT_FAILURE;
939
goto end;
940
}
941
}
942
ret = TEMP_FAILURE_RETRY(close(sd));
943
if(ret == -1){
944
perror("close");
945
}
946
}
947
948
uid = getuid();
949
gid = getgid();
950
951
ret = setuid(uid);
952
if (ret == -1){
953
perror("setuid");
954
}
955
956
setgid(gid);
957
if (ret == -1){
958
perror("setgid");
959
}
960
961
ret = init_gnutls_global(&mc, pubkey, seckey);
962
if (ret == -1){
963
fprintf(stderr, "init_gnutls_global failed\n");
964
exitcode = EXIT_FAILURE;
965
goto end;
966
} else {
967
gnutls_initalized = true;
968
}
969
970
if(mkdtemp(tempdir) == NULL){
971
perror("mkdtemp");
972
tempdir[0] = '\0';
973
goto end;
974
}
975
976
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
977
fprintf(stderr, "gpgme_initalized failed\n");
978
exitcode = EXIT_FAILURE;
979
goto end;
980
} else {
981
gpgme_initalized = true;
982
}
983
984
if_index = (AvahiIfIndex) if_nametoindex(interface);
985
if(if_index == 0){
986
fprintf(stderr, "No such interface: \"%s\"\n", interface);
987
exit(EXIT_FAILURE);
988
}
989
990
if(connect_to != NULL){
991
/* Connect directly, do not use Zeroconf */
992
/* (Mainly meant for debugging) */
993
char *address = strrchr(connect_to, ':');
994
if(address == NULL){
995
fprintf(stderr, "No colon in address\n");
996
exitcode = EXIT_FAILURE;
997
goto end;
998
}
2116
999
errno = 0;
2117
switch(key){
2118
case 128: /* --debug */
2119
debug = true;
2120
break;
2121
case 'c': /* --connect */
2122
connect_to = arg;
2123
break;
2124
case 'i': /* --interface */
2125
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2126
arg, (int)',');
2127
if(ret_errno != 0){
2128
argp_error(state, "%s", strerror(ret_errno));
2129
}
2130
break;
2131
case 's': /* --seckey */
2132
seckey = arg;
2133
break;
2134
case 'p': /* --pubkey */
2135
pubkey = arg;
2136
break;
2137
case 129: /* --dh-bits */
2138
errno = 0;
2139
tmpmax = strtoimax(arg, &tmp, 10);
2140
if(errno != 0 or tmp == arg or *tmp != '\0'
2141
or tmpmax != (typeof(mc.dh_bits))tmpmax){
2142
argp_error(state, "Bad number of DH bits");
2143
}
2144
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2145
break;
2146
case 130: /* --priority */
2147
mc.priority = arg;
2148
break;
2149
case 131: /* --delay */
2150
errno = 0;
2151
delay = strtof(arg, &tmp);
2152
if(errno != 0 or tmp == arg or *tmp != '\0'){
2153
argp_error(state, "Bad delay");
2154
}
2155
case 132: /* --retry */
2156
errno = 0;
2157
retry_interval = strtod(arg, &tmp);
2158
if(errno != 0 or tmp == arg or *tmp != '\0'
2159
or (retry_interval * 1000) > INT_MAX
2160
or retry_interval < 0){
2161
argp_error(state, "Bad retry interval");
2162
}
2163
break;
2164
case 133: /* --network-hook-dir */
2165
hookdir = arg;
2166
break;
2167
/*
2168
* These reproduce what we would get without ARGP_NO_HELP
2169
*/
2170
case '?': /* --help */
2171
argp_state_help(state, state->out_stream,
2172
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2173
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2174
case -3: /* --usage */
2175
argp_state_help(state, state->out_stream,
2176
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2177
case 'V': /* --version */
2178
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2179
exit(argp_err_exit_status);
2180
break;
2181
default:
2182
return ARGP_ERR_UNKNOWN;
2183
}
2184
return errno;
2185
}
2186
2187
struct argp argp = { .options = options, .parser = parse_opt,
2188
.args_doc = "",
2189
.doc = "Mandos client -- Get and decrypt"
2190
" passwords from a Mandos server" };
2191
ret = argp_parse(&argp, argc, argv,
2192
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2193
switch(ret){
2194
case 0:
2195
break;
2196
case ENOMEM:
2197
default:
2198
errno = ret;
2199
perror_plus("argp_parse");
2200
exitcode = EX_OSERR;
2201
goto end;
2202
case EINVAL:
2203
exitcode = EX_USAGE;
2204
goto end;
2205
}
2206
}
2207
2208
{
2209
/* Work around Debian bug #633582:
2210
<http://bugs.debian.org/633582> */
2211
2212
/* Re-raise privileges */
2213
ret_errno = raise_privileges();
2214
if(ret_errno != 0){
2215
errno = ret_errno;
2216
perror_plus("Failed to raise privileges");
2217
} else {
2218
struct stat st;
2219
2220
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2221
int seckey_fd = open(seckey, O_RDONLY);
2222
if(seckey_fd == -1){
2223
perror_plus("open");
2224
} else {
2225
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2226
if(ret == -1){
2227
perror_plus("fstat");
2228
} else {
2229
if(S_ISREG(st.st_mode)
2230
and st.st_uid == 0 and st.st_gid == 0){
2231
ret = fchown(seckey_fd, uid, gid);
2232
if(ret == -1){
2233
perror_plus("fchown");
2234
}
2235
}
2236
}
2237
TEMP_FAILURE_RETRY(close(seckey_fd));
2238
}
2239
}
2240
2241
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2242
int pubkey_fd = open(pubkey, O_RDONLY);
2243
if(pubkey_fd == -1){
2244
perror_plus("open");
2245
} else {
2246
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2247
if(ret == -1){
2248
perror_plus("fstat");
2249
} else {
2250
if(S_ISREG(st.st_mode)
2251
and st.st_uid == 0 and st.st_gid == 0){
2252
ret = fchown(pubkey_fd, uid, gid);
2253
if(ret == -1){
2254
perror_plus("fchown");
2255
}
2256
}
2257
}
2258
TEMP_FAILURE_RETRY(close(pubkey_fd));
2259
}
2260
}
2261
2262
/* Lower privileges */
2263
ret_errno = lower_privileges();
2264
if(ret_errno != 0){
2265
errno = ret_errno;
2266
perror_plus("Failed to lower privileges");
2267
}
2268
}
2269
}
2270
2271
/* Remove invalid interface names (except "none") */
2272
{
2273
char *interface = NULL;
2274
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2275
interface))){
2276
if(strcmp(interface, "none") != 0
2277
and if_nametoindex(interface) == 0){
2278
if(interface[0] != '\0'){
2279
fprintf_plus(stderr, "Not using nonexisting interface"
2280
" \"%s\"\n", interface);
2281
}
2282
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2283
interface = NULL;
2284
}
2285
}
2286
}
2287
2288
/* Run network hooks */
2289
{
2290
if(mc.interfaces != NULL){
2291
interfaces_hooks = malloc(mc.interfaces_size);
2292
if(interfaces_hooks == NULL){
2293
perror_plus("malloc");
1000
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
1001
if(errno){
1002
perror("Bad port number");
1003
exitcode = EXIT_FAILURE;
2294
1004
goto end;
2295
1005
}
2296
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2297
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2298
}
2299
run_network_hooks("start", interfaces_hooks != NULL ?
2300
interfaces_hooks : "", delay);
2301
}
2302
2303
if(not debug){
2304
avahi_set_log_function(empty_log);
2305
}
2306
2307
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2308
from the signal handler */
2309
/* Initialize the pseudo-RNG for Avahi */
2310
srand((unsigned int) time(NULL));
2311
simple_poll = avahi_simple_poll_new();
2312
if(simple_poll == NULL){
2313
fprintf_plus(stderr,
2314
"Avahi: Failed to create simple poll object.\n");
2315
exitcode = EX_UNAVAILABLE;
2316
goto end;
2317
}
2318
2319
sigemptyset(&sigterm_action.sa_mask);
2320
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2321
if(ret == -1){
2322
perror_plus("sigaddset");
2323
exitcode = EX_OSERR;
2324
goto end;
2325
}
2326
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2327
if(ret == -1){
2328
perror_plus("sigaddset");
2329
exitcode = EX_OSERR;
2330
goto end;
2331
}
2332
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2333
if(ret == -1){
2334
perror_plus("sigaddset");
2335
exitcode = EX_OSERR;
2336
goto end;
2337
}
2338
/* Need to check if the handler is SIG_IGN before handling:
2339
| [[info:libc:Initial Signal Actions]] |
2340
| [[info:libc:Basic Signal Handling]] |
2341
*/
2342
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2343
if(ret == -1){
2344
perror_plus("sigaction");
2345
return EX_OSERR;
2346
}
2347
if(old_sigterm_action.sa_handler != SIG_IGN){
2348
ret = sigaction(SIGINT, &sigterm_action, NULL);
2349
if(ret == -1){
2350
perror_plus("sigaction");
2351
exitcode = EX_OSERR;
2352
goto end;
2353
}
2354
}
2355
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2356
if(ret == -1){
2357
perror_plus("sigaction");
2358
return EX_OSERR;
2359
}
2360
if(old_sigterm_action.sa_handler != SIG_IGN){
2361
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2362
if(ret == -1){
2363
perror_plus("sigaction");
2364
exitcode = EX_OSERR;
2365
goto end;
2366
}
2367
}
2368
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2369
if(ret == -1){
2370
perror_plus("sigaction");
2371
return EX_OSERR;
2372
}
2373
if(old_sigterm_action.sa_handler != SIG_IGN){
2374
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2375
if(ret == -1){
2376
perror_plus("sigaction");
2377
exitcode = EX_OSERR;
2378
goto end;
2379
}
2380
}
2381
2382
/* If no interfaces were specified, make a list */
2383
if(mc.interfaces == NULL){
2384
struct dirent **direntries = NULL;
2385
/* Look for any good interfaces */
2386
ret = scandir(sys_class_net, &direntries, good_interface,
2387
alphasort);
2388
if(ret >= 1){
2389
/* Add all found interfaces to interfaces list */
2390
for(int i = 0; i < ret; ++i){
2391
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2392
direntries[i]->d_name);
2393
if(ret_errno != 0){
2394
errno = ret_errno;
2395
perror_plus("argz_add");
2396
free(direntries[i]);
2397
continue;
2398
}
2399
if(debug){
2400
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2401
direntries[i]->d_name);
2402
}
2403
free(direntries[i]);
2404
}
2405
free(direntries);
2406
} else {
2407
if(ret == 0){
2408
free(direntries);
2409
}
2410
fprintf_plus(stderr, "Could not find a network interface\n");
2411
exitcode = EXIT_FAILURE;
2412
goto end;
2413
}
2414
}
2415
2416
/* Bring up interfaces which are down, and remove any "none"s */
2417
{
2418
char *interface = NULL;
2419
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2420
interface))){
2421
/* If interface name is "none", stop bringing up interfaces.
2422
Also remove all instances of "none" from the list */
2423
if(strcmp(interface, "none") == 0){
2424
argz_delete(&mc.interfaces, &mc.interfaces_size,
2425
interface);
2426
interface = NULL;
2427
while((interface = argz_next(mc.interfaces,
2428
mc.interfaces_size, interface))){
2429
if(strcmp(interface, "none") == 0){
2430
argz_delete(&mc.interfaces, &mc.interfaces_size,
2431
interface);
2432
interface = NULL;
2433
}
2434
}
2435
break;
2436
}
2437
bool interface_was_up = interface_is_up(interface);
2438
errno = bring_up_interface(interface, delay);
2439
if(not interface_was_up){
2440
if(errno != 0){
2441
perror_plus("Failed to bring up interface");
2442
} else {
2443
errno = argz_add(&interfaces_to_take_down,
2444
&interfaces_to_take_down_size,
2445
interface);
2446
if(errno != 0){
2447
perror_plus("argz_add");
2448
}
2449
}
2450
}
2451
}
2452
if(debug and (interfaces_to_take_down == NULL)){
2453
fprintf_plus(stderr, "No interfaces were brought up\n");
2454
}
2455
}
2456
2457
/* If we only got one interface, explicitly use only that one */
2458
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2459
if(debug){
2460
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2461
mc.interfaces);
2462
}
2463
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2464
}
2465
2466
if(quit_now){
2467
goto end;
2468
}
2469
2470
ret = init_gnutls_global(pubkey, seckey, &mc);
2471
if(ret == -1){
2472
fprintf_plus(stderr, "init_gnutls_global failed\n");
2473
exitcode = EX_UNAVAILABLE;
2474
goto end;
2475
} else {
2476
gnutls_initialized = true;
2477
}
2478
2479
if(quit_now){
2480
goto end;
2481
}
2482
2483
/* Try /run/tmp before /tmp */
2484
tempdir = mkdtemp(run_tempdir);
2485
if(tempdir == NULL and errno == ENOENT){
2486
if(debug){
2487
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2488
run_tempdir, old_tempdir);
2489
}
2490
tempdir = mkdtemp(old_tempdir);
2491
}
2492
if(tempdir == NULL){
2493
perror_plus("mkdtemp");
2494
goto end;
2495
}
2496
2497
if(quit_now){
2498
goto end;
2499
}
2500
2501
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2502
fprintf_plus(stderr, "init_gpgme failed\n");
2503
exitcode = EX_UNAVAILABLE;
2504
goto end;
2505
} else {
2506
gpgme_initialized = true;
2507
}
2508
2509
if(quit_now){
2510
goto end;
2511
}
2512
2513
if(connect_to != NULL){
2514
/* Connect directly, do not use Zeroconf */
2515
/* (Mainly meant for debugging) */
2516
char *address = strrchr(connect_to, ':');
2517
2518
if(address == NULL){
2519
fprintf_plus(stderr, "No colon in address\n");
2520
exitcode = EX_USAGE;
2521
goto end;
2522
}
2523
2524
if(quit_now){
2525
goto end;
2526
}
2527
2528
in_port_t port;
2529
errno = 0;
2530
tmpmax = strtoimax(address+1, &tmp, 10);
2531
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2532
or tmpmax != (in_port_t)tmpmax){
2533
fprintf_plus(stderr, "Bad port number\n");
2534
exitcode = EX_USAGE;
2535
goto end;
2536
}
2537
2538
if(quit_now){
2539
goto end;
2540
}
2541
2542
port = (in_port_t)tmpmax;
2543
*address = '\0';
2544
/* Colon in address indicates IPv6 */
2545
int af;
2546
if(strchr(connect_to, ':') != NULL){
2547
af = AF_INET6;
2548
/* Accept [] around IPv6 address - see RFC 5952 */
2549
if(connect_to[0] == '[' and address[-1] == ']')
2550
{
2551
connect_to++;
2552
address[-1] = '\0';
2553
}
2554
} else {
2555
af = AF_INET;
2556
}
2557
address = connect_to;
2558
2559
if(quit_now){
2560
goto end;
2561
}
2562
2563
while(not quit_now){
2564
ret = start_mandos_communication(address, port, if_index, af,
2565
&mc);
2566
if(quit_now or ret == 0){
2567
break;
2568
}
2569
if(debug){
2570
fprintf_plus(stderr, "Retrying in %d seconds\n",
2571
(int)retry_interval);
2572
}
2573
sleep((unsigned int)retry_interval);
2574
}
2575
2576
if(not quit_now){
2577
exitcode = EXIT_SUCCESS;
2578
}
2579
2580
goto end;
2581
}
2582
2583
if(quit_now){
2584
goto end;
2585
}
2586
2587
{
2588
AvahiServerConfig config;
2589
/* Do not publish any local Zeroconf records */
2590
avahi_server_config_init(&config);
2591
config.publish_hinfo = 0;
2592
config.publish_addresses = 0;
2593
config.publish_workstation = 0;
2594
config.publish_domain = 0;
2595
2596
/* Allocate a new server */
2597
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2598
&config, NULL, NULL, &ret_errno);
2599
2600
/* Free the Avahi configuration data */
2601
avahi_server_config_free(&config);
2602
}
2603
2604
/* Check if creating the Avahi server object succeeded */
2605
if(mc.server == NULL){
2606
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2607
avahi_strerror(ret_errno));
2608
exitcode = EX_UNAVAILABLE;
2609
goto end;
2610
}
2611
2612
if(quit_now){
2613
goto end;
2614
}
2615
2616
/* Create the Avahi service browser */
2617
sb = avahi_s_service_browser_new(mc.server, if_index,
2618
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2619
NULL, 0, browse_callback,
2620
(void *)&mc);
2621
if(sb == NULL){
2622
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2623
avahi_strerror(avahi_server_errno(mc.server)));
2624
exitcode = EX_UNAVAILABLE;
2625
goto end;
2626
}
2627
2628
if(quit_now){
2629
goto end;
2630
}
2631
2632
/* Run the main loop */
2633
2634
if(debug){
2635
fprintf_plus(stderr, "Starting Avahi loop search\n");
2636
}
2637
2638
ret = avahi_loop_with_timeout(simple_poll,
2639
(int)(retry_interval * 1000), &mc);
2640
if(debug){
2641
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2642
(ret == 0) ? "successfully" : "with error");
2643
}
2644
1006
*address = '\0';
1007
address = connect_to;
1008
ret = start_mandos_communication(address, port, if_index, &mc);
1009
if(ret < 0){
1010
exitcode = EXIT_FAILURE;
1011
} else {
1012
exitcode = EXIT_SUCCESS;
1013
}
1014
goto end;
1015
}
1016
1017
if (not debug){
1018
avahi_set_log_function(empty_log);
1019
}
1020
1021
/* Initialize the pseudo-RNG for Avahi */
1022
srand((unsigned int) time(NULL));
1023
1024
/* Allocate main Avahi loop object */
1025
mc.simple_poll = avahi_simple_poll_new();
1026
if (mc.simple_poll == NULL) {
1027
fprintf(stderr, "Avahi: Failed to create simple poll"
1028
" object.\n");
1029
exitcode = EXIT_FAILURE;
1030
goto end;
1031
}
1032
1033
{
1034
AvahiServerConfig config;
1035
/* Do not publish any local Zeroconf records */
1036
avahi_server_config_init(&config);
1037
config.publish_hinfo = 0;
1038
config.publish_addresses = 0;
1039
config.publish_workstation = 0;
1040
config.publish_domain = 0;
1041
1042
/* Allocate a new server */
1043
mc.server = avahi_server_new(avahi_simple_poll_get
1044
(mc.simple_poll), &config, NULL,
1045
NULL, &error);
1046
1047
/* Free the Avahi configuration data */
1048
avahi_server_config_free(&config);
1049
}
1050
1051
/* Check if creating the Avahi server object succeeded */
1052
if (mc.server == NULL) {
1053
fprintf(stderr, "Failed to create Avahi server: %s\n",
1054
avahi_strerror(error));
1055
exitcode = EXIT_FAILURE;
1056
goto end;
1057
}
1058
1059
/* Create the Avahi service browser */
1060
sb = avahi_s_service_browser_new(mc.server, if_index,
1061
AVAHI_PROTO_INET6,
1062
"_mandos._tcp", NULL, 0,
1063
browse_callback, &mc);
1064
if (sb == NULL) {
1065
fprintf(stderr, "Failed to create service browser: %s\n",
1066
avahi_strerror(avahi_server_errno(mc.server)));
1067
exitcode = EXIT_FAILURE;
1068
goto end;
1069
}
1070
1071
/* Run the main loop */
1072
1073
if (debug){
1074
fprintf(stderr, "Starting Avahi loop search\n");
1075
}
1076
1077
avahi_simple_poll_loop(mc.simple_poll);
1078
2645
1079
end:
2646
2647
if(debug){
2648
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2649
}
2650
2651
/* Cleanup things */
2652
free(mc.interfaces);
2653
2654
if(sb != NULL)
2655
avahi_s_service_browser_free(sb);
2656
2657
if(mc.server != NULL)
2658
avahi_server_free(mc.server);
2659
2660
if(simple_poll != NULL)
2661
avahi_simple_poll_free(simple_poll);
2662
2663
if(gnutls_initialized){
2664
gnutls_certificate_free_credentials(mc.cred);
2665
gnutls_global_deinit();
2666
gnutls_dh_params_deinit(mc.dh_params);
2667
}
2668
2669
if(gpgme_initialized){
2670
gpgme_release(mc.ctx);
2671
}
2672
2673
/* Cleans up the circular linked list of Mandos servers the client
2674
has seen */
2675
if(mc.current_server != NULL){
2676
mc.current_server->prev->next = NULL;
2677
while(mc.current_server != NULL){
2678
server *next = mc.current_server->next;
2679
#ifdef __GNUC__
2680
#pragma GCC diagnostic push
2681
#pragma GCC diagnostic ignored "-Wcast-qual"
2682
#endif
2683
free((char *)(mc.current_server->ip));
2684
#ifdef __GNUC__
2685
#pragma GCC diagnostic pop
2686
#endif
2687
free(mc.current_server);
2688
mc.current_server = next;
2689
}
2690
}
2691
2692
/* Re-raise privileges */
2693
{
2694
ret_errno = raise_privileges();
2695
if(ret_errno != 0){
2696
errno = ret_errno;
2697
perror_plus("Failed to raise privileges");
2698
} else {
2699
2700
/* Run network hooks */
2701
run_network_hooks("stop", interfaces_hooks != NULL ?
2702
interfaces_hooks : "", delay);
2703
2704
/* Take down the network interfaces which were brought up */
2705
{
2706
char *interface = NULL;
2707
while((interface=argz_next(interfaces_to_take_down,
2708
interfaces_to_take_down_size,
2709
interface))){
2710
ret_errno = take_down_interface(interface);
2711
if(ret_errno != 0){
2712
errno = ret_errno;
2713
perror_plus("Failed to take down interface");
2714
}
2715
}
2716
if(debug and (interfaces_to_take_down == NULL)){
2717
fprintf_plus(stderr, "No interfaces needed to be taken"
2718
" down\n");
2719
}
2720
}
2721
}
2722
2723
ret_errno = lower_privileges_permanently();
2724
if(ret_errno != 0){
2725
errno = ret_errno;
2726
perror_plus("Failed to lower privileges permanently");
2727
}
2728
}
2729
2730
free(interfaces_to_take_down);
2731
free(interfaces_hooks);
2732
2733
/* Removes the GPGME temp directory and all files inside */
2734
if(tempdir != NULL){
2735
struct dirent **direntries = NULL;
2736
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2737
O_NOFOLLOW));
2738
if(tempdir_fd == -1){
2739
perror_plus("open");
2740
} else {
2741
#ifdef __GLIBC__
2742
#if __GLIBC_PREREQ(2, 15)
2743
int numentries = scandirat(tempdir_fd, ".", &direntries,
2744
notdotentries, alphasort);
2745
#else /* not __GLIBC_PREREQ(2, 15) */
2746
int numentries = scandir(tempdir, &direntries, notdotentries,
2747
alphasort);
2748
#endif /* not __GLIBC_PREREQ(2, 15) */
2749
#else /* not __GLIBC__ */
2750
int numentries = scandir(tempdir, &direntries, notdotentries,
2751
alphasort);
2752
#endif /* not __GLIBC__ */
2753
if(numentries >= 0){
2754
for(int i = 0; i < numentries; i++){
2755
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2756
if(ret == -1){
2757
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2758
" \"%s\", 0): %s\n", tempdir,
2759
direntries[i]->d_name, strerror(errno));
2760
}
2761
free(direntries[i]);
2762
}
2763
2764
/* need to clean even if 0 because man page doesn't specify */
2765
free(direntries);
2766
if(numentries == -1){
2767
perror_plus("scandir");
2768
}
2769
ret = rmdir(tempdir);
2770
if(ret == -1 and errno != ENOENT){
2771
perror_plus("rmdir");
2772
}
2773
}
2774
TEMP_FAILURE_RETRY(close(tempdir_fd));
2775
}
2776
}
2777
2778
if(quit_now){
2779
sigemptyset(&old_sigterm_action.sa_mask);
2780
old_sigterm_action.sa_handler = SIG_DFL;
2781
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2782
&old_sigterm_action,
2783
NULL));
2784
if(ret == -1){
2785
perror_plus("sigaction");
2786
}
2787
do {
2788
ret = raise(signal_received);
2789
} while(ret != 0 and errno == EINTR);
2790
if(ret != 0){
2791
perror_plus("raise");
2792
abort();
2793
}
2794
TEMP_FAILURE_RETRY(pause());
2795
}
2796
2797
return exitcode;
1080
1081
if (debug){
1082
fprintf(stderr, "%s exiting\n", argv[0]);
1083
}
1084
1085
/* Cleanup things */
1086
if (sb != NULL)
1087
avahi_s_service_browser_free(sb);
1088
1089
if (mc.server != NULL)
1090
avahi_server_free(mc.server);
1091
1092
if (mc.simple_poll != NULL)
1093
avahi_simple_poll_free(mc.simple_poll);
1094
1095
if (gnutls_initalized){
1096
gnutls_certificate_free_credentials(mc.cred);
1097
gnutls_global_deinit ();
1098
gnutls_dh_params_deinit(mc.dh_params);
1099
}
1100
1101
if(gpgme_initalized){
1102
gpgme_release(mc.ctx);
1103
}
1104
1105
/* Removes the temp directory used by GPGME */
1106
if(tempdir[0] != '\0'){
1107
DIR *d;
1108
struct dirent *direntry;
1109
d = opendir(tempdir);
1110
if(d == NULL){
1111
perror("opendir");
1112
} else {
1113
while(true){
1114
direntry = readdir(d);
1115
if(direntry == NULL){
1116
break;
1117
}
1118
if (direntry->d_type == DT_REG){
1119
char *fullname = NULL;
1120
ret = asprintf(&fullname, "%s/%s", tempdir,
1121
direntry->d_name);
1122
if(ret < 0){
1123
perror("asprintf");
1124
continue;
1125
}
1126
ret = unlink(fullname);
1127
if(ret == -1){
1128
fprintf(stderr, "unlink(\"%s\"): %s",
1129
fullname, strerror(errno));
1130
}
1131
free(fullname);
1132
}
1133
}
1134
closedir(d);
1135
}
1136
ret = rmdir(tempdir);
1137
if(ret == -1){
1138
perror("rmdir");
1139
}
1140
}
1141
1142
return exitcode;
2798
1143
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0