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- Committer: Teddy Hogeborn
- Date: 2014-06-07 21:58:56 UTC
- Revision ID: teddy@recompile.se-20140607215856-9q31dfsc68uuvzo4
Make mandos-client use scandirat() if it exists.
* plugins.d/mandos-client.d (hookdir_fd): File descriptor for hookdir.
(set_cloexec_flag): Define this function if O_CLOEXEC is undefined.
(run_network_hooks): Open hookdir_fd. Use scandirat() if it exists.
* plugins.d/mandos-client.d (hookdir_fd): File descriptor for hookdir.
(set_cloexec_flag): Define this function if O_CLOEXEC is undefined.
(run_network_hooks): Open hookdir_fd. Use scandirat() if it exists.
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- debian/upstream
- network-hooks.d
- files removed:
- plugins.d/usplash
- files renamed:
- plugins.d/password-request.c => plugins.d/mandos-client.c
- plugins.d/password-request.xml => plugins.d/mandos-client.xml
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
1
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
* Mandos client - get and decrypt data from a Mandos server
3
* Mandos-client - get and decrypt data from a Mandos server
4
4
*
5
5
* This program is partly derived from an example program for an Avahi
6
6
* service browser, downloaded from
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
12
* Copyright © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 Björn Påhlsson
13
14
*
14
15
* This program is free software: you can redistribute it and/or
15
16
* modify it under the terms of the GNU General Public License as
25
26
* along with this program. If not, see
26
27
* <http://www.gnu.org/licenses/>.
27
28
*
28
* Contact the authors at <mandos@fukt.bsnet.se>.
29
* Contact the authors at <mandos@recompile.se>.
29
30
*/
30
31
31
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
32
34
#define _LARGEFILE_SOURCE
35
#endif /* not _LARGEFILE_SOURCE */
36
#ifndef _FILE_OFFSET_BITS
33
37
#define _FILE_OFFSET_BITS 64
38
#endif /* not _FILE_OFFSET_BITS */
34
39
35
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
36
41
37
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
38
stdout, ferror() */
39
#include <stdint.h> /* uint16_t, uint32_t */
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
40
45
#include <stddef.h> /* NULL, size_t, ssize_t */
41
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
42
srand() */
43
#include <stdbool.h> /* bool, true */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
#include <stdbool.h> /* bool, false, true */
44
49
#include <string.h> /* memset(), strcmp(), strlen(),
45
50
strerror(), asprintf(), strcpy() */
46
#include <sys/ioctl.h> /* ioctl */
51
#include <sys/ioctl.h> /* ioctl */
47
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
48
53
sockaddr_in6, PF_INET6,
49
SOCK_STREAM, INET6_ADDRSTRLEN,
50
uid_t, gid_t */
51
#include <inttypes.h> /* PRIu16 */
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
52
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
53
struct in6_addr, inet_pton(),
54
connect() */
55
#include <assert.h> /* assert() */
56
#include <errno.h> /* perror(), errno */
57
#include <time.h> /* time() */
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open() */
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
*/
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
strtoimax() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
58
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
59
69
SIOCSIFFLAGS, if_indextoname(),
60
70
if_nametoindex(), IF_NAMESIZE */
71
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
*/
61
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
62
getuid(), getgid(), setuid(),
63
setgid() */
64
#include <netinet/in.h>
65
#include <arpa/inet.h> /* inet_pton(), htons */
66
#include <iso646.h> /* not, and */
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons() */
78
#include <iso646.h> /* not, or, and */
67
79
#include <argp.h> /* struct argp_option, error_t, struct
68
80
argp_state, struct argp,
69
81
argp_parse(), ARGP_KEY_ARG,
70
82
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
83
#include <signal.h> /* sigemptyset(), sigaddset(),
84
sigaction(), SIGTERM, sig_atomic_t,
85
raise() */
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
WEXITSTATUS(), WTERMSIG() */
90
#include <grp.h> /* setgroups() */
91
#include <argz.h> /* argz_add_sep(), argz_next(),
92
argz_delete(), argz_append(),
93
argz_stringify(), argz_add(),
94
argz_count() */
95
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
96
EAI_SYSTEM, gai_strerror() */
97
98
#ifdef __linux__
99
#include <sys/klog.h> /* klogctl() */
100
#endif /* __linux__ */
71
101
72
102
/* Avahi */
73
103
/* All Avahi types, constants and functions
86
116
gnutls_*
87
117
init_gnutls_session(),
88
118
GNUTLS_* */
89
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
90
GNUTLS_OPENPGP_FMT_BASE64 */
119
#include <gnutls/openpgp.h>
120
/* gnutls_certificate_set_openpgp_key_file(),
121
GNUTLS_OPENPGP_FMT_BASE64 */
91
122
92
123
/* GPGME */
93
124
#include <gpgme.h> /* All GPGME types, constants and
98
129
99
130
#define BUFFER_SIZE 256
100
131
132
#define PATHDIR "/conf/conf.d/mandos"
133
#define SECKEY "seckey.txt"
134
#define PUBKEY "pubkey.txt"
135
#define HOOKDIR "/lib/mandos/network-hooks.d"
136
101
137
bool debug = false;
102
static const char *keydir = "/conf/conf.d/mandos";
103
138
static const char mandos_protocol_version[] = "1";
104
const char *argp_program_version = "password-request 1.0";
105
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
139
const char *argp_program_version = "mandos-client " VERSION;
140
const char *argp_program_bug_address = "<mandos@recompile.se>";
141
static const char sys_class_net[] = "/sys/class/net";
142
char *connect_to = NULL;
143
const char *hookdir = HOOKDIR;
144
int hookdir_fd = -1;
145
uid_t uid = 65534;
146
gid_t gid = 65534;
147
148
/* Doubly linked list that need to be circularly linked when used */
149
typedef struct server{
150
const char *ip;
151
in_port_t port;
152
AvahiIfIndex if_index;
153
int af;
154
struct timespec last_seen;
155
struct server *next;
156
struct server *prev;
157
} server;
106
158
107
159
/* Used for passing in values through the Avahi callback functions */
108
160
typedef struct {
109
AvahiSimplePoll *simple_poll;
110
161
AvahiServer *server;
111
162
gnutls_certificate_credentials_t cred;
112
163
unsigned int dh_bits;
113
164
gnutls_dh_params_t dh_params;
114
165
const char *priority;
166
gpgme_ctx_t ctx;
167
server *current_server;
168
char *interfaces;
169
size_t interfaces_size;
115
170
} mandos_context;
116
171
172
/* global so signal handler can reach it*/
173
AvahiSimplePoll *simple_poll;
174
175
sig_atomic_t quit_now = 0;
176
int signal_received = 0;
177
178
/* Function to use when printing errors */
179
void perror_plus(const char *print_text){
180
int e = errno;
181
fprintf(stderr, "Mandos plugin %s: ",
182
program_invocation_short_name);
183
errno = e;
184
perror(print_text);
185
}
186
187
__attribute__((format (gnu_printf, 2, 3), nonnull))
188
int fprintf_plus(FILE *stream, const char *format, ...){
189
va_list ap;
190
va_start (ap, format);
191
192
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
193
program_invocation_short_name));
194
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
195
}
196
117
197
/*
118
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
119
* "buffer_capacity" is how much is currently allocated,
198
* Make additional room in "buffer" for at least BUFFER_SIZE more
199
* bytes. "buffer_capacity" is how much is currently allocated,
120
200
* "buffer_length" is how much is already used.
121
201
*/
122
size_t adjustbuffer(char **buffer, size_t buffer_length,
123
size_t buffer_capacity){
124
if (buffer_length + BUFFER_SIZE > buffer_capacity){
125
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
126
if (buffer == NULL){
202
__attribute__((nonnull, warn_unused_result))
203
size_t incbuffer(char **buffer, size_t buffer_length,
204
size_t buffer_capacity){
205
if(buffer_length + BUFFER_SIZE > buffer_capacity){
206
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
207
if(new_buf == NULL){
208
int old_errno = errno;
209
free(*buffer);
210
errno = old_errno;
211
*buffer = NULL;
127
212
return 0;
128
213
}
214
*buffer = new_buf;
129
215
buffer_capacity += BUFFER_SIZE;
130
216
}
131
217
return buffer_capacity;
132
218
}
133
219
220
/* Add server to set of servers to retry periodically */
221
__attribute__((nonnull, warn_unused_result))
222
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
223
int af, server **current_server){
224
int ret;
225
server *new_server = malloc(sizeof(server));
226
if(new_server == NULL){
227
perror_plus("malloc");
228
return false;
229
}
230
*new_server = (server){ .ip = strdup(ip),
231
.port = port,
232
.if_index = if_index,
233
.af = af };
234
if(new_server->ip == NULL){
235
perror_plus("strdup");
236
return false;
237
}
238
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
239
if(ret == -1){
240
perror_plus("clock_gettime");
241
return false;
242
}
243
/* Special case of first server */
244
if(*current_server == NULL){
245
new_server->next = new_server;
246
new_server->prev = new_server;
247
*current_server = new_server;
248
} else {
249
/* Place the new server last in the list */
250
new_server->next = *current_server;
251
new_server->prev = (*current_server)->prev;
252
new_server->prev->next = new_server;
253
(*current_server)->prev = new_server;
254
}
255
return true;
256
}
257
134
258
/*
135
* Decrypt OpenPGP data using keyrings in HOMEDIR.
136
* Returns -1 on error
259
* Initialize GPGME.
137
260
*/
138
static ssize_t pgp_packet_decrypt (const char *cryptotext,
139
size_t crypto_size,
140
char **plaintext,
141
const char *homedir){
142
gpgme_data_t dh_crypto, dh_plain;
143
gpgme_ctx_t ctx;
261
__attribute__((nonnull, warn_unused_result))
262
static bool init_gpgme(const char * const seckey,
263
const char * const pubkey,
264
const char * const tempdir,
265
mandos_context *mc){
144
266
gpgme_error_t rc;
145
ssize_t ret;
146
size_t plaintext_capacity = 0;
147
ssize_t plaintext_length = 0;
148
267
gpgme_engine_info_t engine_info;
149
268
150
if (debug){
151
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
269
/*
270
* Helper function to insert pub and seckey to the engine keyring.
271
*/
272
bool import_key(const char * const filename){
273
int ret;
274
int fd;
275
gpgme_data_t pgp_data;
276
277
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
278
if(fd == -1){
279
perror_plus("open");
280
return false;
281
}
282
283
rc = gpgme_data_new_from_fd(&pgp_data, fd);
284
if(rc != GPG_ERR_NO_ERROR){
285
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
286
gpgme_strsource(rc), gpgme_strerror(rc));
287
return false;
288
}
289
290
rc = gpgme_op_import(mc->ctx, pgp_data);
291
if(rc != GPG_ERR_NO_ERROR){
292
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
293
gpgme_strsource(rc), gpgme_strerror(rc));
294
return false;
295
}
296
297
ret = (int)TEMP_FAILURE_RETRY(close(fd));
298
if(ret == -1){
299
perror_plus("close");
300
}
301
gpgme_data_release(pgp_data);
302
return true;
303
}
304
305
if(debug){
306
fprintf_plus(stderr, "Initializing GPGME\n");
152
307
}
153
308
154
309
/* Init GPGME */
155
310
gpgme_check_version(NULL);
156
311
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
157
if (rc != GPG_ERR_NO_ERROR){
158
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
159
gpgme_strsource(rc), gpgme_strerror(rc));
160
return -1;
312
if(rc != GPG_ERR_NO_ERROR){
313
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
314
gpgme_strsource(rc), gpgme_strerror(rc));
315
return false;
161
316
}
162
317
163
318
/* Set GPGME home directory for the OpenPGP engine only */
164
rc = gpgme_get_engine_info (&engine_info);
165
if (rc != GPG_ERR_NO_ERROR){
166
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
167
gpgme_strsource(rc), gpgme_strerror(rc));
168
return -1;
319
rc = gpgme_get_engine_info(&engine_info);
320
if(rc != GPG_ERR_NO_ERROR){
321
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
322
gpgme_strsource(rc), gpgme_strerror(rc));
323
return false;
169
324
}
170
325
while(engine_info != NULL){
171
326
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
172
327
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
173
engine_info->file_name, homedir);
328
engine_info->file_name, tempdir);
174
329
break;
175
330
}
176
331
engine_info = engine_info->next;
177
332
}
178
333
if(engine_info == NULL){
179
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
180
return -1;
334
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
335
tempdir);
336
return false;
337
}
338
339
/* Create new GPGME "context" */
340
rc = gpgme_new(&(mc->ctx));
341
if(rc != GPG_ERR_NO_ERROR){
342
fprintf_plus(stderr, "Mandos plugin mandos-client: "
343
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
344
gpgme_strerror(rc));
345
return false;
346
}
347
348
if(not import_key(pubkey) or not import_key(seckey)){
349
return false;
350
}
351
352
return true;
353
}
354
355
/*
356
* Decrypt OpenPGP data.
357
* Returns -1 on error
358
*/
359
__attribute__((nonnull, warn_unused_result))
360
static ssize_t pgp_packet_decrypt(const char *cryptotext,
361
size_t crypto_size,
362
char **plaintext,
363
mandos_context *mc){
364
gpgme_data_t dh_crypto, dh_plain;
365
gpgme_error_t rc;
366
ssize_t ret;
367
size_t plaintext_capacity = 0;
368
ssize_t plaintext_length = 0;
369
370
if(debug){
371
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
181
372
}
182
373
183
374
/* Create new GPGME data buffer from memory cryptotext */
184
375
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
185
376
0);
186
if (rc != GPG_ERR_NO_ERROR){
187
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
188
gpgme_strsource(rc), gpgme_strerror(rc));
377
if(rc != GPG_ERR_NO_ERROR){
378
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
379
gpgme_strsource(rc), gpgme_strerror(rc));
189
380
return -1;
190
381
}
191
382
192
383
/* Create new empty GPGME data buffer for the plaintext */
193
384
rc = gpgme_data_new(&dh_plain);
194
if (rc != GPG_ERR_NO_ERROR){
195
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
196
gpgme_strsource(rc), gpgme_strerror(rc));
385
if(rc != GPG_ERR_NO_ERROR){
386
fprintf_plus(stderr, "Mandos plugin mandos-client: "
387
"bad gpgme_data_new: %s: %s\n",
388
gpgme_strsource(rc), gpgme_strerror(rc));
197
389
gpgme_data_release(dh_crypto);
198
390
return -1;
199
391
}
200
392
201
/* Create new GPGME "context" */
202
rc = gpgme_new(&ctx);
203
if (rc != GPG_ERR_NO_ERROR){
204
fprintf(stderr, "bad gpgme_new: %s: %s\n",
205
gpgme_strsource(rc), gpgme_strerror(rc));
206
plaintext_length = -1;
207
goto decrypt_end;
208
}
209
210
393
/* Decrypt data from the cryptotext data buffer to the plaintext
211
394
data buffer */
212
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
213
if (rc != GPG_ERR_NO_ERROR){
214
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
215
gpgme_strsource(rc), gpgme_strerror(rc));
395
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
396
if(rc != GPG_ERR_NO_ERROR){
397
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
398
gpgme_strsource(rc), gpgme_strerror(rc));
216
399
plaintext_length = -1;
217
if (debug){
400
if(debug){
218
401
gpgme_decrypt_result_t result;
219
result = gpgme_op_decrypt_result(ctx);
220
if (result == NULL){
221
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
402
result = gpgme_op_decrypt_result(mc->ctx);
403
if(result == NULL){
404
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
222
405
} else {
223
fprintf(stderr, "Unsupported algorithm: %s\n",
224
result->unsupported_algorithm);
225
fprintf(stderr, "Wrong key usage: %u\n",
226
result->wrong_key_usage);
406
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
407
result->unsupported_algorithm);
408
fprintf_plus(stderr, "Wrong key usage: %u\n",
409
result->wrong_key_usage);
227
410
if(result->file_name != NULL){
228
fprintf(stderr, "File name: %s\n", result->file_name);
411
fprintf_plus(stderr, "File name: %s\n", result->file_name);
229
412
}
230
413
gpgme_recipient_t recipient;
231
414
recipient = result->recipients;
232
if(recipient){
233
while(recipient != NULL){
234
fprintf(stderr, "Public key algorithm: %s\n",
235
gpgme_pubkey_algo_name(recipient->pubkey_algo));
236
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
237
fprintf(stderr, "Secret key available: %s\n",
238
recipient->status == GPG_ERR_NO_SECKEY
239
? "No" : "Yes");
240
recipient = recipient->next;
241
}
415
while(recipient != NULL){
416
fprintf_plus(stderr, "Public key algorithm: %s\n",
417
gpgme_pubkey_algo_name
418
(recipient->pubkey_algo));
419
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
420
fprintf_plus(stderr, "Secret key available: %s\n",
421
recipient->status == GPG_ERR_NO_SECKEY
422
? "No" : "Yes");
423
recipient = recipient->next;
242
424
}
243
425
}
244
426
}
246
428
}
247
429
248
430
if(debug){
249
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
431
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
250
432
}
251
433
252
434
/* Seek back to the beginning of the GPGME plaintext data buffer */
253
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
254
perror("pgpme_data_seek");
435
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
436
perror_plus("gpgme_data_seek");
255
437
plaintext_length = -1;
256
438
goto decrypt_end;
257
439
}
258
440
259
441
*plaintext = NULL;
260
442
while(true){
261
plaintext_capacity = adjustbuffer(plaintext,
262
(size_t)plaintext_length,
263
plaintext_capacity);
264
if (plaintext_capacity == 0){
265
perror("adjustbuffer");
266
plaintext_length = -1;
267
goto decrypt_end;
443
plaintext_capacity = incbuffer(plaintext,
444
(size_t)plaintext_length,
445
plaintext_capacity);
446
if(plaintext_capacity == 0){
447
perror_plus("incbuffer");
448
plaintext_length = -1;
449
goto decrypt_end;
268
450
}
269
451
270
452
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
271
453
BUFFER_SIZE);
272
454
/* Print the data, if any */
273
if (ret == 0){
455
if(ret == 0){
274
456
/* EOF */
275
457
break;
276
458
}
277
459
if(ret < 0){
278
perror("gpgme_data_read");
460
perror_plus("gpgme_data_read");
279
461
plaintext_length = -1;
280
462
goto decrypt_end;
281
463
}
282
464
plaintext_length += ret;
283
465
}
284
466
285
467
if(debug){
286
fprintf(stderr, "Decrypted password is: ");
468
fprintf_plus(stderr, "Decrypted password is: ");
287
469
for(ssize_t i = 0; i < plaintext_length; i++){
288
470
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
289
471
}
300
482
return plaintext_length;
301
483
}
302
484
303
static const char * safer_gnutls_strerror (int value) {
304
const char *ret = gnutls_strerror (value); /* Spurious warning */
305
if (ret == NULL)
485
__attribute__((warn_unused_result))
486
static const char *safer_gnutls_strerror(int value){
487
const char *ret = gnutls_strerror(value);
488
if(ret == NULL)
306
489
ret = "(unknown)";
307
490
return ret;
308
491
}
309
492
310
493
/* GnuTLS log function callback */
494
__attribute__((nonnull))
311
495
static void debuggnutls(__attribute__((unused)) int level,
312
496
const char* string){
313
fprintf(stderr, "GnuTLS: %s", string);
497
fprintf_plus(stderr, "GnuTLS: %s", string);
314
498
}
315
499
316
static int init_gnutls_global(mandos_context *mc,
317
const char *pubkeyfilename,
318
const char *seckeyfilename){
500
__attribute__((nonnull, warn_unused_result))
501
static int init_gnutls_global(const char *pubkeyfilename,
502
const char *seckeyfilename,
503
mandos_context *mc){
319
504
int ret;
320
505
321
506
if(debug){
322
fprintf(stderr, "Initializing GnuTLS\n");
507
fprintf_plus(stderr, "Initializing GnuTLS\n");
323
508
}
324
509
325
510
ret = gnutls_global_init();
326
if (ret != GNUTLS_E_SUCCESS) {
327
fprintf (stderr, "GnuTLS global_init: %s\n",
328
safer_gnutls_strerror(ret));
511
if(ret != GNUTLS_E_SUCCESS){
512
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
513
safer_gnutls_strerror(ret));
329
514
return -1;
330
515
}
331
516
332
if (debug){
517
if(debug){
333
518
/* "Use a log level over 10 to enable all debugging options."
334
519
* - GnuTLS manual
335
520
*/
338
523
}
339
524
340
525
/* OpenPGP credentials */
341
gnutls_certificate_allocate_credentials(&mc->cred);
342
if (ret != GNUTLS_E_SUCCESS){
343
fprintf (stderr, "GnuTLS memory error: %s\n", /* Spurious
344
warning */
345
safer_gnutls_strerror(ret));
346
gnutls_global_deinit ();
526
ret = gnutls_certificate_allocate_credentials(&mc->cred);
527
if(ret != GNUTLS_E_SUCCESS){
528
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
529
safer_gnutls_strerror(ret));
530
gnutls_global_deinit();
347
531
return -1;
348
532
}
349
533
350
534
if(debug){
351
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
352
" and keyfile %s as GnuTLS credentials\n", pubkeyfilename,
353
seckeyfilename);
535
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
536
" secret key %s as GnuTLS credentials\n",
537
pubkeyfilename,
538
seckeyfilename);
354
539
}
355
540
356
541
ret = gnutls_certificate_set_openpgp_key_file
357
542
(mc->cred, pubkeyfilename, seckeyfilename,
358
543
GNUTLS_OPENPGP_FMT_BASE64);
359
if (ret != GNUTLS_E_SUCCESS) {
360
fprintf(stderr,
361
"Error[%d] while reading the OpenPGP key pair ('%s',"
362
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
363
fprintf(stdout, "The GnuTLS error is: %s\n",
364
safer_gnutls_strerror(ret));
544
if(ret != GNUTLS_E_SUCCESS){
545
fprintf_plus(stderr,
546
"Error[%d] while reading the OpenPGP key pair ('%s',"
547
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
548
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
549
safer_gnutls_strerror(ret));
365
550
goto globalfail;
366
551
}
367
552
368
553
/* GnuTLS server initialization */
369
554
ret = gnutls_dh_params_init(&mc->dh_params);
370
if (ret != GNUTLS_E_SUCCESS) {
371
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
372
" %s\n", safer_gnutls_strerror(ret));
555
if(ret != GNUTLS_E_SUCCESS){
556
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
557
" initialization: %s\n",
558
safer_gnutls_strerror(ret));
373
559
goto globalfail;
374
560
}
375
561
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
376
if (ret != GNUTLS_E_SUCCESS) {
377
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
378
safer_gnutls_strerror(ret));
562
if(ret != GNUTLS_E_SUCCESS){
563
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
564
safer_gnutls_strerror(ret));
379
565
goto globalfail;
380
566
}
381
567
382
568
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
383
569
384
570
return 0;
385
571
386
572
globalfail:
387
573
388
574
gnutls_certificate_free_credentials(mc->cred);
389
575
gnutls_global_deinit();
576
gnutls_dh_params_deinit(mc->dh_params);
390
577
return -1;
391
392
578
}
393
579
394
static int init_gnutls_session(mandos_context *mc,
395
gnutls_session_t *session){
580
__attribute__((nonnull, warn_unused_result))
581
static int init_gnutls_session(gnutls_session_t *session,
582
mandos_context *mc){
396
583
int ret;
397
584
/* GnuTLS session creation */
398
ret = gnutls_init(session, GNUTLS_SERVER);
399
if (ret != GNUTLS_E_SUCCESS){
400
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
401
safer_gnutls_strerror(ret));
585
do {
586
ret = gnutls_init(session, GNUTLS_SERVER);
587
if(quit_now){
588
return -1;
589
}
590
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
591
if(ret != GNUTLS_E_SUCCESS){
592
fprintf_plus(stderr,
593
"Error in GnuTLS session initialization: %s\n",
594
safer_gnutls_strerror(ret));
402
595
}
403
596
404
597
{
405
598
const char *err;
406
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
407
if (ret != GNUTLS_E_SUCCESS) {
408
fprintf(stderr, "Syntax error at: %s\n", err);
409
fprintf(stderr, "GnuTLS error: %s\n",
410
safer_gnutls_strerror(ret));
411
gnutls_deinit (*session);
599
do {
600
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
601
if(quit_now){
602
gnutls_deinit(*session);
603
return -1;
604
}
605
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
606
if(ret != GNUTLS_E_SUCCESS){
607
fprintf_plus(stderr, "Syntax error at: %s\n", err);
608
fprintf_plus(stderr, "GnuTLS error: %s\n",
609
safer_gnutls_strerror(ret));
610
gnutls_deinit(*session);
412
611
return -1;
413
612
}
414
613
}
415
614
416
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
417
mc->cred);
418
if (ret != GNUTLS_E_SUCCESS) {
419
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
420
safer_gnutls_strerror(ret));
421
gnutls_deinit (*session);
615
do {
616
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
617
mc->cred);
618
if(quit_now){
619
gnutls_deinit(*session);
620
return -1;
621
}
622
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
623
if(ret != GNUTLS_E_SUCCESS){
624
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
625
safer_gnutls_strerror(ret));
626
gnutls_deinit(*session);
422
627
return -1;
423
628
}
424
629
425
630
/* ignore client certificate if any. */
426
gnutls_certificate_server_set_request (*session,
427
GNUTLS_CERT_IGNORE);
631
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
428
632
429
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
633
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
430
634
431
635
return 0;
432
636
}
436
640
__attribute__((unused)) const char *txt){}
437
641
438
642
/* Called when a Mandos server is found */
439
static int start_mandos_communication(const char *ip, uint16_t port,
643
__attribute__((nonnull, warn_unused_result))
644
static int start_mandos_communication(const char *ip, in_port_t port,
440
645
AvahiIfIndex if_index,
441
mandos_context *mc){
442
int ret, tcp_sd;
443
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
646
int af, mandos_context *mc){
647
int ret, tcp_sd = -1;
648
ssize_t sret;
649
struct sockaddr_storage to;
444
650
char *buffer = NULL;
445
char *decrypted_buffer;
651
char *decrypted_buffer = NULL;
446
652
size_t buffer_length = 0;
447
653
size_t buffer_capacity = 0;
448
ssize_t decrypted_buffer_size;
449
654
size_t written;
450
int retval = 0;
451
char interface[IF_NAMESIZE];
655
int retval = -1;
452
656
gnutls_session_t session;
453
454
ret = init_gnutls_session (mc, &session);
455
if (ret != 0){
456
return -1;
457
}
458
459
if(debug){
460
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
461
"\n", ip, port);
462
}
463
464
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
465
if(tcp_sd < 0) {
466
perror("socket");
467
return -1;
468
}
469
470
if(debug){
471
if(if_indextoname((unsigned int)if_index, interface) == NULL){
472
perror("if_indextoname");
657
int pf; /* Protocol family */
658
659
errno = 0;
660
661
if(quit_now){
662
errno = EINTR;
663
return -1;
664
}
665
666
switch(af){
667
case AF_INET6:
668
pf = PF_INET6;
669
break;
670
case AF_INET:
671
pf = PF_INET;
672
break;
673
default:
674
fprintf_plus(stderr, "Bad address family: %d\n", af);
675
errno = EINVAL;
676
return -1;
677
}
678
679
/* If the interface is specified and we have a list of interfaces */
680
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
681
/* Check if the interface is one of the interfaces we are using */
682
bool match = false;
683
{
684
char *interface = NULL;
685
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
686
interface))){
687
if(if_nametoindex(interface) == (unsigned int)if_index){
688
match = true;
689
break;
690
}
691
}
692
}
693
if(not match){
694
/* This interface does not match any in the list, so we don't
695
connect to the server */
696
if(debug){
697
char interface[IF_NAMESIZE];
698
if(if_indextoname((unsigned int)if_index, interface) == NULL){
699
perror_plus("if_indextoname");
700
} else {
701
fprintf_plus(stderr, "Skipping server on non-used interface"
702
" \"%s\"\n",
703
if_indextoname((unsigned int)if_index,
704
interface));
705
}
706
}
473
707
return -1;
474
708
}
475
fprintf(stderr, "Binding to interface %s\n", interface);
709
}
710
711
ret = init_gnutls_session(&session, mc);
712
if(ret != 0){
713
return -1;
714
}
715
716
if(debug){
717
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
718
PRIuMAX "\n", ip, (uintmax_t)port);
719
}
720
721
tcp_sd = socket(pf, SOCK_STREAM, 0);
722
if(tcp_sd < 0){
723
int e = errno;
724
perror_plus("socket");
725
errno = e;
726
goto mandos_end;
727
}
728
729
if(quit_now){
730
errno = EINTR;
731
goto mandos_end;
476
732
}
477
733
478
734
memset(&to, 0, sizeof(to));
479
to.in6.sin6_family = AF_INET6;
480
/* It would be nice to have a way to detect if we were passed an
481
IPv4 address here. Now we assume an IPv6 address. */
482
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
483
if (ret < 0 ){
484
perror("inet_pton");
485
return -1;
735
if(af == AF_INET6){
736
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
737
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
738
} else { /* IPv4 */
739
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
740
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
741
}
742
if(ret < 0 ){
743
int e = errno;
744
perror_plus("inet_pton");
745
errno = e;
746
goto mandos_end;
486
747
}
487
748
if(ret == 0){
488
fprintf(stderr, "Bad address: %s\n", ip);
489
return -1;
490
}
491
to.in6.sin6_port = htons(port); /* Spurious warning */
749
int e = errno;
750
fprintf_plus(stderr, "Bad address: %s\n", ip);
751
errno = e;
752
goto mandos_end;
753
}
754
if(af == AF_INET6){
755
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
756
if(IN6_IS_ADDR_LINKLOCAL
757
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
758
if(if_index == AVAHI_IF_UNSPEC){
759
fprintf_plus(stderr, "An IPv6 link-local address is"
760
" incomplete without a network interface\n");
761
errno = EINVAL;
762
goto mandos_end;
763
}
764
/* Set the network interface number as scope */
765
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
766
}
767
} else {
768
((struct sockaddr_in *)&to)->sin_port = htons(port);
769
}
492
770
493
to.in6.sin6_scope_id = (uint32_t)if_index;
771
if(quit_now){
772
errno = EINTR;
773
goto mandos_end;
774
}
494
775
495
776
if(debug){
496
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
497
port);
498
char addrstr[INET6_ADDRSTRLEN] = "";
499
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
500
sizeof(addrstr)) == NULL){
501
perror("inet_ntop");
502
} else {
503
if(strcmp(addrstr, ip) != 0){
504
fprintf(stderr, "Canonical address form: %s\n", addrstr);
777
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
778
char interface[IF_NAMESIZE];
779
if(if_indextoname((unsigned int)if_index, interface) == NULL){
780
perror_plus("if_indextoname");
781
} else {
782
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
783
"\n", ip, interface, (uintmax_t)port);
505
784
}
506
}
507
}
508
509
ret = connect(tcp_sd, &to.in, sizeof(to));
510
if (ret < 0){
511
perror("connect");
512
return -1;
513
}
514
785
} else {
786
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
787
ip, (uintmax_t)port);
788
}
789
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
790
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
791
if(af == AF_INET6){
792
ret = getnameinfo((struct sockaddr *)&to,
793
sizeof(struct sockaddr_in6),
794
addrstr, sizeof(addrstr), NULL, 0,
795
NI_NUMERICHOST);
796
} else {
797
ret = getnameinfo((struct sockaddr *)&to,
798
sizeof(struct sockaddr_in),
799
addrstr, sizeof(addrstr), NULL, 0,
800
NI_NUMERICHOST);
801
}
802
if(ret == EAI_SYSTEM){
803
perror_plus("getnameinfo");
804
} else if(ret != 0) {
805
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
806
} else if(strcmp(addrstr, ip) != 0){
807
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
808
}
809
}
810
811
if(quit_now){
812
errno = EINTR;
813
goto mandos_end;
814
}
815
816
if(af == AF_INET6){
817
ret = connect(tcp_sd, (struct sockaddr *)&to,
818
sizeof(struct sockaddr_in6));
819
} else {
820
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
821
sizeof(struct sockaddr_in));
822
}
823
if(ret < 0){
824
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
825
int e = errno;
826
perror_plus("connect");
827
errno = e;
828
}
829
goto mandos_end;
830
}
831
832
if(quit_now){
833
errno = EINTR;
834
goto mandos_end;
835
}
836
515
837
const char *out = mandos_protocol_version;
516
838
written = 0;
517
while (true){
839
while(true){
518
840
size_t out_size = strlen(out);
519
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
520
out_size - written));
521
if (ret == -1){
522
perror("write");
523
retval = -1;
841
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
842
out_size - written));
843
if(ret == -1){
844
int e = errno;
845
perror_plus("write");
846
errno = e;
524
847
goto mandos_end;
525
848
}
526
849
written += (size_t)ret;
527
850
if(written < out_size){
528
851
continue;
529
852
} else {
530
if (out == mandos_protocol_version){
853
if(out == mandos_protocol_version){
531
854
written = 0;
532
855
out = "\r\n";
533
856
} else {
534
857
break;
535
858
}
536
859
}
860
861
if(quit_now){
862
errno = EINTR;
863
goto mandos_end;
864
}
537
865
}
538
866
539
867
if(debug){
540
fprintf(stderr, "Establishing TLS session with %s\n", ip);
541
}
542
543
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
544
545
do{
546
ret = gnutls_handshake (session);
868
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
869
}
870
871
if(quit_now){
872
errno = EINTR;
873
goto mandos_end;
874
}
875
876
/* This casting via intptr_t is to eliminate warning about casting
877
an int to a pointer type. This is exactly how the GnuTLS Guile
878
function "set-session-transport-fd!" does it. */
879
gnutls_transport_set_ptr(session,
880
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
881
882
if(quit_now){
883
errno = EINTR;
884
goto mandos_end;
885
}
886
887
do {
888
ret = gnutls_handshake(session);
889
if(quit_now){
890
errno = EINTR;
891
goto mandos_end;
892
}
547
893
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
548
894
549
if (ret != GNUTLS_E_SUCCESS){
895
if(ret != GNUTLS_E_SUCCESS){
550
896
if(debug){
551
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
552
gnutls_perror (ret);
897
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
898
gnutls_perror(ret);
553
899
}
554
retval = -1;
900
errno = EPROTO;
555
901
goto mandos_end;
556
902
}
557
903
558
904
/* Read OpenPGP packet that contains the wanted password */
559
905
560
906
if(debug){
561
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
562
ip);
907
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
908
" %s\n", ip);
563
909
}
564
910
565
911
while(true){
566
buffer_capacity = adjustbuffer(&buffer, buffer_length,
567
buffer_capacity);
568
if (buffer_capacity == 0){
569
perror("adjustbuffer");
570
retval = -1;
571
goto mandos_end;
572
}
573
574
ret = gnutls_record_recv(session, buffer+buffer_length,
575
BUFFER_SIZE);
576
if (ret == 0){
912
913
if(quit_now){
914
errno = EINTR;
915
goto mandos_end;
916
}
917
918
buffer_capacity = incbuffer(&buffer, buffer_length,
919
buffer_capacity);
920
if(buffer_capacity == 0){
921
int e = errno;
922
perror_plus("incbuffer");
923
errno = e;
924
goto mandos_end;
925
}
926
927
if(quit_now){
928
errno = EINTR;
929
goto mandos_end;
930
}
931
932
sret = gnutls_record_recv(session, buffer+buffer_length,
933
BUFFER_SIZE);
934
if(sret == 0){
577
935
break;
578
936
}
579
if (ret < 0){
580
switch(ret){
937
if(sret < 0){
938
switch(sret){
581
939
case GNUTLS_E_INTERRUPTED:
582
940
case GNUTLS_E_AGAIN:
583
941
break;
584
942
case GNUTLS_E_REHANDSHAKE:
585
do{
586
ret = gnutls_handshake (session);
943
do {
944
ret = gnutls_handshake(session);
945
946
if(quit_now){
947
errno = EINTR;
948
goto mandos_end;
949
}
587
950
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
588
if (ret < 0){
589
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
590
gnutls_perror (ret);
591
retval = -1;
951
if(ret < 0){
952
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
953
"***\n");
954
gnutls_perror(ret);
955
errno = EPROTO;
592
956
goto mandos_end;
593
957
}
594
958
break;
595
959
default:
596
fprintf(stderr, "Unknown error while reading data from"
597
" encrypted session with Mandos server\n");
598
retval = -1;
599
gnutls_bye (session, GNUTLS_SHUT_RDWR);
960
fprintf_plus(stderr, "Unknown error while reading data from"
961
" encrypted session with Mandos server\n");
962
gnutls_bye(session, GNUTLS_SHUT_RDWR);
963
errno = EIO;
600
964
goto mandos_end;
601
965
}
602
966
} else {
603
buffer_length += (size_t) ret;
967
buffer_length += (size_t) sret;
604
968
}
605
969
}
606
970
607
971
if(debug){
608
fprintf(stderr, "Closing TLS session\n");
609
}
610
611
gnutls_bye (session, GNUTLS_SHUT_RDWR);
612
613
if (buffer_length > 0){
614
decrypted_buffer_size = pgp_packet_decrypt(buffer,
615
buffer_length,
616
&decrypted_buffer,
617
keydir);
618
if (decrypted_buffer_size >= 0){
972
fprintf_plus(stderr, "Closing TLS session\n");
973
}
974
975
if(quit_now){
976
errno = EINTR;
977
goto mandos_end;
978
}
979
980
do {
981
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
982
if(quit_now){
983
errno = EINTR;
984
goto mandos_end;
985
}
986
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
987
988
if(buffer_length > 0){
989
ssize_t decrypted_buffer_size;
990
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
991
&decrypted_buffer, mc);
992
if(decrypted_buffer_size >= 0){
993
619
994
written = 0;
620
995
while(written < (size_t) decrypted_buffer_size){
621
ret = (int)fwrite (decrypted_buffer + written, 1,
622
(size_t)decrypted_buffer_size - written,
623
stdout);
996
if(quit_now){
997
errno = EINTR;
998
goto mandos_end;
999
}
1000
1001
ret = (int)fwrite(decrypted_buffer + written, 1,
1002
(size_t)decrypted_buffer_size - written,
1003
stdout);
624
1004
if(ret == 0 and ferror(stdout)){
1005
int e = errno;
625
1006
if(debug){
626
fprintf(stderr, "Error writing encrypted data: %s\n",
627
strerror(errno));
1007
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1008
strerror(errno));
628
1009
}
629
retval = -1;
630
break;
1010
errno = e;
1011
goto mandos_end;
631
1012
}
632
1013
written += (size_t)ret;
633
1014
}
634
free(decrypted_buffer);
635
} else {
636
retval = -1;
1015
retval = 0;
637
1016
}
638
} else {
639
retval = -1;
640
1017
}
641
1018
642
1019
/* Shutdown procedure */
643
1020
644
1021
mandos_end:
645
free(buffer);
646
close(tcp_sd);
647
gnutls_deinit (session);
1022
{
1023
int e = errno;
1024
free(decrypted_buffer);
1025
free(buffer);
1026
if(tcp_sd >= 0){
1027
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1028
}
1029
if(ret == -1){
1030
if(e == 0){
1031
e = errno;
1032
}
1033
perror_plus("close");
1034
}
1035
gnutls_deinit(session);
1036
errno = e;
1037
if(quit_now){
1038
errno = EINTR;
1039
retval = -1;
1040
}
1041
}
648
1042
return retval;
649
1043
}
650
1044
1045
__attribute__((nonnull))
651
1046
static void resolve_callback(AvahiSServiceResolver *r,
652
1047
AvahiIfIndex interface,
653
AVAHI_GCC_UNUSED AvahiProtocol protocol,
1048
AvahiProtocol proto,
654
1049
AvahiResolverEvent event,
655
1050
const char *name,
656
1051
const char *type,
661
1056
AVAHI_GCC_UNUSED AvahiStringList *txt,
662
1057
AVAHI_GCC_UNUSED AvahiLookupResultFlags
663
1058
flags,
664
void* userdata) {
665
mandos_context *mc = userdata;
666
assert(r);
1059
void *mc){
1060
if(r == NULL){
1061
return;
1062
}
667
1063
668
1064
/* Called whenever a service has been resolved successfully or
669
1065
timed out */
670
1066
671
switch (event) {
1067
if(quit_now){
1068
return;
1069
}
1070
1071
switch(event){
672
1072
default:
673
1073
case AVAHI_RESOLVER_FAILURE:
674
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
675
" of type '%s' in domain '%s': %s\n", name, type, domain,
676
avahi_strerror(avahi_server_errno(mc->server)));
1074
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1075
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1076
domain,
1077
avahi_strerror(avahi_server_errno
1078
(((mandos_context*)mc)->server)));
677
1079
break;
678
1080
679
1081
case AVAHI_RESOLVER_FOUND:
681
1083
char ip[AVAHI_ADDRESS_STR_MAX];
682
1084
avahi_address_snprint(ip, sizeof(ip), address);
683
1085
if(debug){
684
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
685
PRIu16 ") on port %d\n", name, host_name, ip,
686
interface, port);
1086
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1087
PRIdMAX ") on port %" PRIu16 "\n", name,
1088
host_name, ip, (intmax_t)interface, port);
687
1089
}
688
int ret = start_mandos_communication(ip, port, interface, mc);
689
if (ret == 0){
690
avahi_simple_poll_quit(mc->simple_poll);
1090
int ret = start_mandos_communication(ip, (in_port_t)port,
1091
interface,
1092
avahi_proto_to_af(proto),
1093
mc);
1094
if(ret == 0){
1095
avahi_simple_poll_quit(simple_poll);
1096
} else {
1097
if(not add_server(ip, (in_port_t)port, interface,
1098
avahi_proto_to_af(proto),
1099
&((mandos_context*)mc)->current_server)){
1100
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1101
" list\n", name);
1102
}
691
1103
}
692
1104
}
693
1105
}
694
1106
avahi_s_service_resolver_free(r);
695
1107
}
696
1108
697
static void browse_callback( AvahiSServiceBrowser *b,
698
AvahiIfIndex interface,
699
AvahiProtocol protocol,
700
AvahiBrowserEvent event,
701
const char *name,
702
const char *type,
703
const char *domain,
704
AVAHI_GCC_UNUSED AvahiLookupResultFlags
705
flags,
706
void* userdata) {
707
mandos_context *mc = userdata;
708
assert(b);
1109
static void browse_callback(AvahiSServiceBrowser *b,
1110
AvahiIfIndex interface,
1111
AvahiProtocol protocol,
1112
AvahiBrowserEvent event,
1113
const char *name,
1114
const char *type,
1115
const char *domain,
1116
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1117
flags,
1118
void *mc){
1119
if(b == NULL){
1120
return;
1121
}
709
1122
710
1123
/* Called whenever a new services becomes available on the LAN or
711
1124
is removed from the LAN */
712
1125
713
switch (event) {
1126
if(quit_now){
1127
return;
1128
}
1129
1130
switch(event){
714
1131
default:
715
1132
case AVAHI_BROWSER_FAILURE:
716
1133
717
fprintf(stderr, "(Avahi browser) %s\n",
718
avahi_strerror(avahi_server_errno(mc->server)));
719
avahi_simple_poll_quit(mc->simple_poll);
1134
fprintf_plus(stderr, "(Avahi browser) %s\n",
1135
avahi_strerror(avahi_server_errno
1136
(((mandos_context*)mc)->server)));
1137
avahi_simple_poll_quit(simple_poll);
720
1138
return;
721
1139
722
1140
case AVAHI_BROWSER_NEW:
725
1143
the callback function is called the Avahi server will free the
726
1144
resolver for us. */
727
1145
728
if (!(avahi_s_service_resolver_new(mc->server, interface,
729
protocol, name, type, domain,
730
AVAHI_PROTO_INET6, 0,
731
resolve_callback, mc)))
732
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
733
name, avahi_strerror(avahi_server_errno(mc->server)));
1146
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1147
interface, protocol, name, type,
1148
domain, protocol, 0,
1149
resolve_callback, mc) == NULL)
1150
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1151
" %s\n", name,
1152
avahi_strerror(avahi_server_errno
1153
(((mandos_context*)mc)->server)));
734
1154
break;
735
1155
736
1156
case AVAHI_BROWSER_REMOVE:
739
1159
case AVAHI_BROWSER_ALL_FOR_NOW:
740
1160
case AVAHI_BROWSER_CACHE_EXHAUSTED:
741
1161
if(debug){
742
fprintf(stderr, "No Mandos server found, still searching...\n");
1162
fprintf_plus(stderr, "No Mandos server found, still"
1163
" searching...\n");
743
1164
}
744
1165
break;
745
1166
}
746
1167
}
747
1168
748
/* Combines file name and path and returns the malloced new
749
string. some sane checks could/should be added */
750
static char *combinepath(const char *first, const char *second){
1169
/* Signal handler that stops main loop after SIGTERM */
1170
static void handle_sigterm(int sig){
1171
if(quit_now){
1172
return;
1173
}
1174
quit_now = 1;
1175
signal_received = sig;
1176
int old_errno = errno;
1177
/* set main loop to exit */
1178
if(simple_poll != NULL){
1179
avahi_simple_poll_quit(simple_poll);
1180
}
1181
errno = old_errno;
1182
}
1183
1184
__attribute__((nonnull, warn_unused_result))
1185
bool get_flags(const char *ifname, struct ifreq *ifr){
1186
int ret;
1187
error_t ret_errno;
1188
1189
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1190
if(s < 0){
1191
ret_errno = errno;
1192
perror_plus("socket");
1193
errno = ret_errno;
1194
return false;
1195
}
1196
strcpy(ifr->ifr_name, ifname);
1197
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1198
if(ret == -1){
1199
if(debug){
1200
ret_errno = errno;
1201
perror_plus("ioctl SIOCGIFFLAGS");
1202
errno = ret_errno;
1203
}
1204
return false;
1205
}
1206
return true;
1207
}
1208
1209
__attribute__((nonnull, warn_unused_result))
1210
bool good_flags(const char *ifname, const struct ifreq *ifr){
1211
1212
/* Reject the loopback device */
1213
if(ifr->ifr_flags & IFF_LOOPBACK){
1214
if(debug){
1215
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1216
ifname);
1217
}
1218
return false;
1219
}
1220
/* Accept point-to-point devices only if connect_to is specified */
1221
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1222
if(debug){
1223
fprintf_plus(stderr, "Accepting point-to-point interface"
1224
" \"%s\"\n", ifname);
1225
}
1226
return true;
1227
}
1228
/* Otherwise, reject non-broadcast-capable devices */
1229
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1230
if(debug){
1231
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1232
" \"%s\"\n", ifname);
1233
}
1234
return false;
1235
}
1236
/* Reject non-ARP interfaces (including dummy interfaces) */
1237
if(ifr->ifr_flags & IFF_NOARP){
1238
if(debug){
1239
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1240
ifname);
1241
}
1242
return false;
1243
}
1244
1245
/* Accept this device */
1246
if(debug){
1247
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1248
}
1249
return true;
1250
}
1251
1252
/*
1253
* This function determines if a directory entry in /sys/class/net
1254
* corresponds to an acceptable network device.
1255
* (This function is passed to scandir(3) as a filter function.)
1256
*/
1257
__attribute__((nonnull, warn_unused_result))
1258
int good_interface(const struct dirent *if_entry){
1259
if(if_entry->d_name[0] == '.'){
1260
return 0;
1261
}
1262
1263
struct ifreq ifr;
1264
if(not get_flags(if_entry->d_name, &ifr)){
1265
if(debug){
1266
fprintf_plus(stderr, "Failed to get flags for interface "
1267
"\"%s\"\n", if_entry->d_name);
1268
}
1269
return 0;
1270
}
1271
1272
if(not good_flags(if_entry->d_name, &ifr)){
1273
return 0;
1274
}
1275
return 1;
1276
}
1277
1278
/*
1279
* This function determines if a network interface is up.
1280
*/
1281
__attribute__((nonnull, warn_unused_result))
1282
bool interface_is_up(const char *interface){
1283
struct ifreq ifr;
1284
if(not get_flags(interface, &ifr)){
1285
if(debug){
1286
fprintf_plus(stderr, "Failed to get flags for interface "
1287
"\"%s\"\n", interface);
1288
}
1289
return false;
1290
}
1291
1292
return (bool)(ifr.ifr_flags & IFF_UP);
1293
}
1294
1295
/*
1296
* This function determines if a network interface is running
1297
*/
1298
__attribute__((nonnull, warn_unused_result))
1299
bool interface_is_running(const char *interface){
1300
struct ifreq ifr;
1301
if(not get_flags(interface, &ifr)){
1302
if(debug){
1303
fprintf_plus(stderr, "Failed to get flags for interface "
1304
"\"%s\"\n", interface);
1305
}
1306
return false;
1307
}
1308
1309
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1310
}
1311
1312
__attribute__((nonnull, pure, warn_unused_result))
1313
int notdotentries(const struct dirent *direntry){
1314
/* Skip "." and ".." */
1315
if(direntry->d_name[0] == '.'
1316
and (direntry->d_name[1] == '\0'
1317
or (direntry->d_name[1] == '.'
1318
and direntry->d_name[2] == '\0'))){
1319
return 0;
1320
}
1321
return 1;
1322
}
1323
1324
/* Is this directory entry a runnable program? */
1325
__attribute__((nonnull, warn_unused_result))
1326
int runnable_hook(const struct dirent *direntry){
1327
int ret;
1328
size_t sret;
1329
struct stat st;
1330
1331
if((direntry->d_name)[0] == '\0'){
1332
/* Empty name? */
1333
return 0;
1334
}
1335
1336
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1337
"abcdefghijklmnopqrstuvwxyz"
1338
"0123456789"
1339
"_.-");
1340
if((direntry->d_name)[sret] != '\0'){
1341
/* Contains non-allowed characters */
1342
if(debug){
1343
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1344
direntry->d_name);
1345
}
1346
return 0;
1347
}
1348
1349
char *fullname = NULL;
1350
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1351
if(ret < 0){
1352
perror_plus("asprintf");
1353
return 0;
1354
}
1355
1356
ret = stat(fullname, &st);
1357
if(ret == -1){
1358
if(debug){
1359
perror_plus("Could not stat hook");
1360
}
1361
return 0;
1362
}
1363
free(fullname);
1364
if(not (S_ISREG(st.st_mode))){
1365
/* Not a regular file */
1366
if(debug){
1367
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1368
direntry->d_name);
1369
}
1370
return 0;
1371
}
1372
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1373
/* Not executable */
1374
if(debug){
1375
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1376
direntry->d_name);
1377
}
1378
return 0;
1379
}
1380
if(debug){
1381
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1382
direntry->d_name);
1383
}
1384
return 1;
1385
}
1386
1387
__attribute__((nonnull, warn_unused_result))
1388
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1389
mandos_context *mc){
1390
int ret;
1391
struct timespec now;
1392
struct timespec waited_time;
1393
intmax_t block_time;
1394
1395
while(true){
1396
if(mc->current_server == NULL){
1397
if(debug){
1398
fprintf_plus(stderr, "Wait until first server is found."
1399
" No timeout!\n");
1400
}
1401
ret = avahi_simple_poll_iterate(s, -1);
1402
} else {
1403
if(debug){
1404
fprintf_plus(stderr, "Check current_server if we should run"
1405
" it, or wait\n");
1406
}
1407
/* the current time */
1408
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1409
if(ret == -1){
1410
perror_plus("clock_gettime");
1411
return -1;
1412
}
1413
/* Calculating in ms how long time between now and server
1414
who we visted longest time ago. Now - last seen. */
1415
waited_time.tv_sec = (now.tv_sec
1416
- mc->current_server->last_seen.tv_sec);
1417
waited_time.tv_nsec = (now.tv_nsec
1418
- mc->current_server->last_seen.tv_nsec);
1419
/* total time is 10s/10,000ms.
1420
Converting to s from ms by dividing by 1,000,
1421
and ns to ms by dividing by 1,000,000. */
1422
block_time = ((retry_interval
1423
- ((intmax_t)waited_time.tv_sec * 1000))
1424
- ((intmax_t)waited_time.tv_nsec / 1000000));
1425
1426
if(debug){
1427
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1428
block_time);
1429
}
1430
1431
if(block_time <= 0){
1432
ret = start_mandos_communication(mc->current_server->ip,
1433
mc->current_server->port,
1434
mc->current_server->if_index,
1435
mc->current_server->af, mc);
1436
if(ret == 0){
1437
avahi_simple_poll_quit(s);
1438
return 0;
1439
}
1440
ret = clock_gettime(CLOCK_MONOTONIC,
1441
&mc->current_server->last_seen);
1442
if(ret == -1){
1443
perror_plus("clock_gettime");
1444
return -1;
1445
}
1446
mc->current_server = mc->current_server->next;
1447
block_time = 0; /* Call avahi to find new Mandos
1448
servers, but don't block */
1449
}
1450
1451
ret = avahi_simple_poll_iterate(s, (int)block_time);
1452
}
1453
if(ret != 0){
1454
if(ret > 0 or errno != EINTR){
1455
return (ret != 1) ? ret : 0;
1456
}
1457
}
1458
}
1459
}
1460
1461
/* Set effective uid to 0, return errno */
1462
__attribute__((warn_unused_result))
1463
error_t raise_privileges(void){
1464
error_t old_errno = errno;
1465
error_t ret_errno = 0;
1466
if(seteuid(0) == -1){
1467
ret_errno = errno;
1468
perror_plus("seteuid");
1469
}
1470
errno = old_errno;
1471
return ret_errno;
1472
}
1473
1474
/* Set effective and real user ID to 0. Return errno. */
1475
__attribute__((warn_unused_result))
1476
error_t raise_privileges_permanently(void){
1477
error_t old_errno = errno;
1478
error_t ret_errno = raise_privileges();
1479
if(ret_errno != 0){
1480
errno = old_errno;
1481
return ret_errno;
1482
}
1483
if(setuid(0) == -1){
1484
ret_errno = errno;
1485
perror_plus("seteuid");
1486
}
1487
errno = old_errno;
1488
return ret_errno;
1489
}
1490
1491
/* Set effective user ID to unprivileged saved user ID */
1492
__attribute__((warn_unused_result))
1493
error_t lower_privileges(void){
1494
error_t old_errno = errno;
1495
error_t ret_errno = 0;
1496
if(seteuid(uid) == -1){
1497
ret_errno = errno;
1498
perror_plus("seteuid");
1499
}
1500
errno = old_errno;
1501
return ret_errno;
1502
}
1503
1504
/* Lower privileges permanently */
1505
__attribute__((warn_unused_result))
1506
error_t lower_privileges_permanently(void){
1507
error_t old_errno = errno;
1508
error_t ret_errno = 0;
1509
if(setuid(uid) == -1){
1510
ret_errno = errno;
1511
perror_plus("setuid");
1512
}
1513
errno = old_errno;
1514
return ret_errno;
1515
}
1516
1517
#ifndef O_CLOEXEC
1518
/*
1519
* Based on the example in the GNU LibC manual chapter 13.13 "File
1520
* Descriptor Flags".
1521
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
1522
*/
1523
__attribute__((warn_unused_result))
1524
static int set_cloexec_flag(int fd){
1525
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
1526
/* If reading the flags failed, return error indication now. */
1527
if(ret < 0){
1528
return ret;
1529
}
1530
/* Store modified flag word in the descriptor. */
1531
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
1532
ret | FD_CLOEXEC));
1533
}
1534
#endif /* not O_CLOEXEC */
1535
1536
__attribute__((nonnull))
1537
void run_network_hooks(const char *mode, const char *interface,
1538
const float delay){
1539
struct dirent **direntries;
1540
if(hookdir_fd == -1){
1541
hookdir_fd = open(hookdir, O_RDONLY |
1542
#ifdef O_CLOEXEC
1543
O_CLOEXEC
1544
#else /* not O_CLOEXEC */
1545
0
1546
#endif /* not O_CLOEXEC */
1547
);
1548
if(hookdir_fd == -1){
1549
if(errno == ENOENT){
1550
if(debug){
1551
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1552
" found\n", hookdir);
1553
}
1554
} else {
1555
perror_plus("open");
1556
}
1557
return;
1558
}
1559
#ifndef O_CLOEXEC
1560
if(set_cloexec_flag(hookdir_fd) < 0){
1561
perror_plus("set_cloexec_flag");
1562
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1563
perror_plus("close");
1564
} else {
1565
hookdir_fd = -1;
1566
}
1567
return;
1568
}
1569
#endif /* not O_CLOEXEC */
1570
}
1571
#ifdef __GLIBC__
1572
#if __GLIBC_PREREQ(2, 15)
1573
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1574
runnable_hook, alphasort);
1575
#else /* not __GLIBC_PREREQ(2, 15) */
1576
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1577
alphasort);
1578
#endif /* not __GLIBC_PREREQ(2, 15) */
1579
#else /* not __GLIBC__ */
1580
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1581
alphasort);
1582
#endif /* not __GLIBC__ */
1583
if(numhooks == -1){
1584
perror_plus("scandir");
1585
return;
1586
}
1587
struct dirent *direntry;
1588
int ret;
1589
int devnull = open("/dev/null", O_RDONLY);
1590
for(int i = 0; i < numhooks; i++){
1591
direntry = direntries[i];
1592
char *fullname = NULL;
1593
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1594
if(ret < 0){
1595
perror_plus("asprintf");
1596
continue;
1597
}
1598
if(debug){
1599
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1600
direntry->d_name);
1601
}
1602
pid_t hook_pid = fork();
1603
if(hook_pid == 0){
1604
/* Child */
1605
/* Raise privileges */
1606
if(raise_privileges_permanently() != 0){
1607
perror_plus("Failed to raise privileges");
1608
_exit(EX_NOPERM);
1609
}
1610
/* Set group */
1611
errno = 0;
1612
ret = setgid(0);
1613
if(ret == -1){
1614
perror_plus("setgid");
1615
_exit(EX_NOPERM);
1616
}
1617
/* Reset supplementary groups */
1618
errno = 0;
1619
ret = setgroups(0, NULL);
1620
if(ret == -1){
1621
perror_plus("setgroups");
1622
_exit(EX_NOPERM);
1623
}
1624
ret = dup2(devnull, STDIN_FILENO);
1625
if(ret == -1){
1626
perror_plus("dup2(devnull, STDIN_FILENO)");
1627
_exit(EX_OSERR);
1628
}
1629
ret = close(devnull);
1630
if(ret == -1){
1631
perror_plus("close");
1632
_exit(EX_OSERR);
1633
}
1634
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1635
if(ret == -1){
1636
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1637
_exit(EX_OSERR);
1638
}
1639
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1640
if(ret == -1){
1641
perror_plus("setenv");
1642
_exit(EX_OSERR);
1643
}
1644
ret = setenv("DEVICE", interface, 1);
1645
if(ret == -1){
1646
perror_plus("setenv");
1647
_exit(EX_OSERR);
1648
}
1649
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1650
if(ret == -1){
1651
perror_plus("setenv");
1652
_exit(EX_OSERR);
1653
}
1654
ret = setenv("MODE", mode, 1);
1655
if(ret == -1){
1656
perror_plus("setenv");
1657
_exit(EX_OSERR);
1658
}
1659
char *delaystring;
1660
ret = asprintf(&delaystring, "%f", (double)delay);
1661
if(ret == -1){
1662
perror_plus("asprintf");
1663
_exit(EX_OSERR);
1664
}
1665
ret = setenv("DELAY", delaystring, 1);
1666
if(ret == -1){
1667
free(delaystring);
1668
perror_plus("setenv");
1669
_exit(EX_OSERR);
1670
}
1671
free(delaystring);
1672
if(connect_to != NULL){
1673
ret = setenv("CONNECT", connect_to, 1);
1674
if(ret == -1){
1675
perror_plus("setenv");
1676
_exit(EX_OSERR);
1677
}
1678
}
1679
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1680
perror_plus("execl");
1681
_exit(EXIT_FAILURE);
1682
}
1683
} else {
1684
int status;
1685
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1686
perror_plus("waitpid");
1687
free(fullname);
1688
continue;
1689
}
1690
if(WIFEXITED(status)){
1691
if(WEXITSTATUS(status) != 0){
1692
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1693
" with status %d\n", direntry->d_name,
1694
WEXITSTATUS(status));
1695
free(fullname);
1696
continue;
1697
}
1698
} else if(WIFSIGNALED(status)){
1699
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1700
" signal %d\n", direntry->d_name,
1701
WTERMSIG(status));
1702
free(fullname);
1703
continue;
1704
} else {
1705
fprintf_plus(stderr, "Warning: network hook \"%s\""
1706
" crashed\n", direntry->d_name);
1707
free(fullname);
1708
continue;
1709
}
1710
}
1711
free(fullname);
1712
if(debug){
1713
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1714
direntry->d_name);
1715
}
1716
}
1717
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1718
perror_plus("close");
1719
} else {
1720
hookdir_fd = -1;
1721
}
1722
close(devnull);
1723
}
1724
1725
__attribute__((nonnull, warn_unused_result))
1726
error_t bring_up_interface(const char *const interface,
1727
const float delay){
1728
error_t old_errno = errno;
1729
int ret;
1730
struct ifreq network;
1731
unsigned int if_index = if_nametoindex(interface);
1732
if(if_index == 0){
1733
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1734
errno = old_errno;
1735
return ENXIO;
1736
}
1737
1738
if(quit_now){
1739
errno = old_errno;
1740
return EINTR;
1741
}
1742
1743
if(not interface_is_up(interface)){
1744
error_t ret_errno = 0, ioctl_errno = 0;
1745
if(not get_flags(interface, &network)){
1746
ret_errno = errno;
1747
fprintf_plus(stderr, "Failed to get flags for interface "
1748
"\"%s\"\n", interface);
1749
errno = old_errno;
1750
return ret_errno;
1751
}
1752
network.ifr_flags |= IFF_UP; /* set flag */
1753
1754
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1755
if(sd == -1){
1756
ret_errno = errno;
1757
perror_plus("socket");
1758
errno = old_errno;
1759
return ret_errno;
1760
}
1761
1762
if(quit_now){
1763
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1764
if(ret == -1){
1765
perror_plus("close");
1766
}
1767
errno = old_errno;
1768
return EINTR;
1769
}
1770
1771
if(debug){
1772
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1773
interface);
1774
}
1775
1776
/* Raise privileges */
1777
ret_errno = raise_privileges();
1778
if(ret_errno != 0){
1779
perror_plus("Failed to raise privileges");
1780
}
1781
1782
#ifdef __linux__
1783
int ret_linux;
1784
bool restore_loglevel = false;
1785
if(ret_errno == 0){
1786
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1787
messages about the network interface to mess up the prompt */
1788
ret_linux = klogctl(8, NULL, 5);
1789
if(ret_linux == -1){
1790
perror_plus("klogctl");
1791
} else {
1792
restore_loglevel = true;
1793
}
1794
}
1795
#endif /* __linux__ */
1796
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1797
ioctl_errno = errno;
1798
#ifdef __linux__
1799
if(restore_loglevel){
1800
ret_linux = klogctl(7, NULL, 0);
1801
if(ret_linux == -1){
1802
perror_plus("klogctl");
1803
}
1804
}
1805
#endif /* __linux__ */
1806
1807
/* If raise_privileges() succeeded above */
1808
if(ret_errno == 0){
1809
/* Lower privileges */
1810
ret_errno = lower_privileges();
1811
if(ret_errno != 0){
1812
errno = ret_errno;
1813
perror_plus("Failed to lower privileges");
1814
}
1815
}
1816
1817
/* Close the socket */
1818
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1819
if(ret == -1){
1820
perror_plus("close");
1821
}
1822
1823
if(ret_setflags == -1){
1824
errno = ioctl_errno;
1825
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1826
errno = old_errno;
1827
return ioctl_errno;
1828
}
1829
} else if(debug){
1830
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1831
interface);
1832
}
1833
1834
/* Sleep checking until interface is running.
1835
Check every 0.25s, up to total time of delay */
1836
for(int i=0; i < delay * 4; i++){
1837
if(interface_is_running(interface)){
1838
break;
1839
}
1840
struct timespec sleeptime = { .tv_nsec = 250000000 };
1841
ret = nanosleep(&sleeptime, NULL);
1842
if(ret == -1 and errno != EINTR){
1843
perror_plus("nanosleep");
1844
}
1845
}
1846
1847
errno = old_errno;
1848
return 0;
1849
}
1850
1851
__attribute__((nonnull, warn_unused_result))
1852
error_t take_down_interface(const char *const interface){
1853
error_t old_errno = errno;
1854
struct ifreq network;
1855
unsigned int if_index = if_nametoindex(interface);
1856
if(if_index == 0){
1857
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1858
errno = old_errno;
1859
return ENXIO;
1860
}
1861
if(interface_is_up(interface)){
1862
error_t ret_errno = 0, ioctl_errno = 0;
1863
if(not get_flags(interface, &network) and debug){
1864
ret_errno = errno;
1865
fprintf_plus(stderr, "Failed to get flags for interface "
1866
"\"%s\"\n", interface);
1867
errno = old_errno;
1868
return ret_errno;
1869
}
1870
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1871
1872
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1873
if(sd == -1){
1874
ret_errno = errno;
1875
perror_plus("socket");
1876
errno = old_errno;
1877
return ret_errno;
1878
}
1879
1880
if(debug){
1881
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1882
interface);
1883
}
1884
1885
/* Raise privileges */
1886
ret_errno = raise_privileges();
1887
if(ret_errno != 0){
1888
perror_plus("Failed to raise privileges");
1889
}
1890
1891
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1892
ioctl_errno = errno;
1893
1894
/* If raise_privileges() succeeded above */
1895
if(ret_errno == 0){
1896
/* Lower privileges */
1897
ret_errno = lower_privileges();
1898
if(ret_errno != 0){
1899
errno = ret_errno;
1900
perror_plus("Failed to lower privileges");
1901
}
1902
}
1903
1904
/* Close the socket */
1905
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1906
if(ret == -1){
1907
perror_plus("close");
1908
}
1909
1910
if(ret_setflags == -1){
1911
errno = ioctl_errno;
1912
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1913
errno = old_errno;
1914
return ioctl_errno;
1915
}
1916
} else if(debug){
1917
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1918
interface);
1919
}
1920
1921
errno = old_errno;
1922
return 0;
1923
}
1924
1925
int main(int argc, char *argv[]){
1926
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1927
.priority = "SECURE256:!CTYPE-X.509:"
1928
"+CTYPE-OPENPGP", .current_server = NULL,
1929
.interfaces = NULL, .interfaces_size = 0 };
1930
AvahiSServiceBrowser *sb = NULL;
1931
error_t ret_errno;
1932
int ret;
1933
intmax_t tmpmax;
751
1934
char *tmp;
752
int ret = asprintf(&tmp, "%s/%s", first, second);
753
if(ret < 0){
754
return NULL;
755
}
756
return tmp;
757
}
758
759
760
int main(int argc, char *argv[]){
761
AvahiSServiceBrowser *sb = NULL;
762
int error;
763
int ret;
764
int exitcode = EXIT_SUCCESS;
765
const char *interface = "eth0";
766
struct ifreq network;
767
int sd;
768
uid_t uid;
769
gid_t gid;
770
char *connect_to = NULL;
771
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
772
char *pubkeyfilename = NULL;
773
char *seckeyfilename = NULL;
774
const char *pubkeyname = "pubkey.txt";
775
const char *seckeyname = "seckey.txt";
776
mandos_context mc = { .simple_poll = NULL, .server = NULL,
777
.dh_bits = 1024, .priority = "SECURE256"};
778
bool gnutls_initalized = false;
779
780
{
781
struct argp_option options[] = {
782
{ .name = "debug", .key = 128,
783
.doc = "Debug mode", .group = 3 },
784
{ .name = "connect", .key = 'c',
785
.arg = "IP",
786
.doc = "Connect directly to a sepcified mandos server",
787
.group = 1 },
788
{ .name = "interface", .key = 'i',
789
.arg = "INTERFACE",
790
.doc = "Interface that Avahi will conntect through",
791
.group = 1 },
792
{ .name = "keydir", .key = 'd',
793
.arg = "KEYDIR",
794
.doc = "Directory where the openpgp keyring is",
795
.group = 1 },
796
{ .name = "seckey", .key = 's',
797
.arg = "SECKEY",
798
.doc = "Secret openpgp key for gnutls authentication",
799
.group = 1 },
800
{ .name = "pubkey", .key = 'p',
801
.arg = "PUBKEY",
802
.doc = "Public openpgp key for gnutls authentication",
803
.group = 2 },
804
{ .name = "dh-bits", .key = 129,
805
.arg = "BITS",
806
.doc = "dh-bits to use in gnutls communication",
807
.group = 2 },
808
{ .name = "priority", .key = 130,
809
.arg = "PRIORITY",
810
.doc = "GNUTLS priority", .group = 1 },
811
{ .name = NULL }
812
};
813
814
815
error_t parse_opt (int key, char *arg,
816
struct argp_state *state) {
817
/* Get the INPUT argument from `argp_parse', which we know is
818
a pointer to our plugin list pointer. */
819
switch (key) {
820
case 128:
821
debug = true;
822
break;
823
case 'c':
824
connect_to = arg;
825
break;
826
case 'i':
827
interface = arg;
828
break;
829
case 'd':
830
keydir = arg;
831
break;
832
case 's':
833
seckeyname = arg;
834
break;
835
case 'p':
836
pubkeyname = arg;
837
break;
838
case 129:
839
errno = 0;
840
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
841
if (errno){
842
perror("strtol");
843
exit(EXIT_FAILURE);
844
}
845
break;
846
case 130:
847
mc.priority = arg;
848
break;
849
case ARGP_KEY_ARG:
850
argp_usage (state);
851
case ARGP_KEY_END:
852
break;
853
default:
854
return ARGP_ERR_UNKNOWN;
855
}
856
return 0;
857
}
858
859
struct argp argp = { .options = options, .parser = parse_opt,
860
.args_doc = "",
861
.doc = "Mandos client -- Get and decrypt"
862
" passwords from mandos server" };
863
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
864
if (ret == ARGP_ERR_UNKNOWN){
865
fprintf(stderr, "Unknown error while parsing arguments\n");
866
exitcode = EXIT_FAILURE;
867
goto end;
868
}
869
}
870
871
pubkeyfilename = combinepath(keydir, pubkeyname);
872
if (pubkeyfilename == NULL){
873
perror("combinepath");
874
exitcode = EXIT_FAILURE;
875
goto end;
876
}
877
878
seckeyfilename = combinepath(keydir, seckeyname);
879
if (seckeyfilename == NULL){
880
perror("combinepath");
881
exitcode = EXIT_FAILURE;
882
goto end;
883
}
884
885
ret = init_gnutls_global(&mc, pubkeyfilename, seckeyfilename);
886
if (ret == -1){
887
fprintf(stderr, "init_gnutls_global failed\n");
888
exitcode = EXIT_FAILURE;
889
goto end;
890
} else {
891
gnutls_initalized = true;
892
}
893
894
/* If the interface is down, bring it up */
895
{
896
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
897
if(sd < 0) {
898
perror("socket");
899
exitcode = EXIT_FAILURE;
900
goto end;
901
}
902
strcpy(network.ifr_name, interface);
903
ret = ioctl(sd, SIOCGIFFLAGS, &network);
904
if(ret == -1){
905
perror("ioctl SIOCGIFFLAGS");
906
exitcode = EXIT_FAILURE;
907
goto end;
908
}
909
if((network.ifr_flags & IFF_UP) == 0){
910
network.ifr_flags |= IFF_UP;
911
ret = ioctl(sd, SIOCSIFFLAGS, &network);
912
if(ret == -1){
913
perror("ioctl SIOCSIFFLAGS");
914
exitcode = EXIT_FAILURE;
915
goto end;
916
}
917
}
918
close(sd);
919
}
920
921
uid = getuid();
922
gid = getgid();
923
924
ret = setuid(uid);
925
if (ret == -1){
926
perror("setuid");
927
}
928
929
setgid(gid);
930
if (ret == -1){
931
perror("setgid");
932
}
933
934
if_index = (AvahiIfIndex) if_nametoindex(interface);
935
if(if_index == 0){
936
fprintf(stderr, "No such interface: \"%s\"\n", interface);
937
exit(EXIT_FAILURE);
938
}
939
940
if(connect_to != NULL){
941
/* Connect directly, do not use Zeroconf */
942
/* (Mainly meant for debugging) */
943
char *address = strrchr(connect_to, ':');
944
if(address == NULL){
945
fprintf(stderr, "No colon in address\n");
946
exitcode = EXIT_FAILURE;
947
goto end;
948
}
1935
int exitcode = EXIT_SUCCESS;
1936
char *interfaces_to_take_down = NULL;
1937
size_t interfaces_to_take_down_size = 0;
1938
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1939
char old_tempdir[] = "/tmp/mandosXXXXXX";
1940
char *tempdir = NULL;
1941
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1942
const char *seckey = PATHDIR "/" SECKEY;
1943
const char *pubkey = PATHDIR "/" PUBKEY;
1944
char *interfaces_hooks = NULL;
1945
1946
bool gnutls_initialized = false;
1947
bool gpgme_initialized = false;
1948
float delay = 2.5f;
1949
double retry_interval = 10; /* 10s between trying a server and
1950
retrying the same server again */
1951
1952
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1953
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1954
1955
uid = getuid();
1956
gid = getgid();
1957
1958
/* Lower any group privileges we might have, just to be safe */
1959
errno = 0;
1960
ret = setgid(gid);
1961
if(ret == -1){
1962
perror_plus("setgid");
1963
}
1964
1965
/* Lower user privileges (temporarily) */
1966
errno = 0;
1967
ret = seteuid(uid);
1968
if(ret == -1){
1969
perror_plus("seteuid");
1970
}
1971
1972
if(quit_now){
1973
goto end;
1974
}
1975
1976
{
1977
struct argp_option options[] = {
1978
{ .name = "debug", .key = 128,
1979
.doc = "Debug mode", .group = 3 },
1980
{ .name = "connect", .key = 'c',
1981
.arg = "ADDRESS:PORT",
1982
.doc = "Connect directly to a specific Mandos server",
1983
.group = 1 },
1984
{ .name = "interface", .key = 'i',
1985
.arg = "NAME",
1986
.doc = "Network interface that will be used to search for"
1987
" Mandos servers",
1988
.group = 1 },
1989
{ .name = "seckey", .key = 's',
1990
.arg = "FILE",
1991
.doc = "OpenPGP secret key file base name",
1992
.group = 1 },
1993
{ .name = "pubkey", .key = 'p',
1994
.arg = "FILE",
1995
.doc = "OpenPGP public key file base name",
1996
.group = 2 },
1997
{ .name = "dh-bits", .key = 129,
1998
.arg = "BITS",
1999
.doc = "Bit length of the prime number used in the"
2000
" Diffie-Hellman key exchange",
2001
.group = 2 },
2002
{ .name = "priority", .key = 130,
2003
.arg = "STRING",
2004
.doc = "GnuTLS priority string for the TLS handshake",
2005
.group = 1 },
2006
{ .name = "delay", .key = 131,
2007
.arg = "SECONDS",
2008
.doc = "Maximum delay to wait for interface startup",
2009
.group = 2 },
2010
{ .name = "retry", .key = 132,
2011
.arg = "SECONDS",
2012
.doc = "Retry interval used when denied by the Mandos server",
2013
.group = 2 },
2014
{ .name = "network-hook-dir", .key = 133,
2015
.arg = "DIR",
2016
.doc = "Directory where network hooks are located",
2017
.group = 2 },
2018
/*
2019
* These reproduce what we would get without ARGP_NO_HELP
2020
*/
2021
{ .name = "help", .key = '?',
2022
.doc = "Give this help list", .group = -1 },
2023
{ .name = "usage", .key = -3,
2024
.doc = "Give a short usage message", .group = -1 },
2025
{ .name = "version", .key = 'V',
2026
.doc = "Print program version", .group = -1 },
2027
{ .name = NULL }
2028
};
2029
2030
error_t parse_opt(int key, char *arg,
2031
struct argp_state *state){
949
2032
errno = 0;
950
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
951
if(errno){
952
perror("Bad port number");
953
exitcode = EXIT_FAILURE;
2033
switch(key){
2034
case 128: /* --debug */
2035
debug = true;
2036
break;
2037
case 'c': /* --connect */
2038
connect_to = arg;
2039
break;
2040
case 'i': /* --interface */
2041
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2042
arg, (int)',');
2043
if(ret_errno != 0){
2044
argp_error(state, "%s", strerror(ret_errno));
2045
}
2046
break;
2047
case 's': /* --seckey */
2048
seckey = arg;
2049
break;
2050
case 'p': /* --pubkey */
2051
pubkey = arg;
2052
break;
2053
case 129: /* --dh-bits */
2054
errno = 0;
2055
tmpmax = strtoimax(arg, &tmp, 10);
2056
if(errno != 0 or tmp == arg or *tmp != '\0'
2057
or tmpmax != (typeof(mc.dh_bits))tmpmax){
2058
argp_error(state, "Bad number of DH bits");
2059
}
2060
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2061
break;
2062
case 130: /* --priority */
2063
mc.priority = arg;
2064
break;
2065
case 131: /* --delay */
2066
errno = 0;
2067
delay = strtof(arg, &tmp);
2068
if(errno != 0 or tmp == arg or *tmp != '\0'){
2069
argp_error(state, "Bad delay");
2070
}
2071
case 132: /* --retry */
2072
errno = 0;
2073
retry_interval = strtod(arg, &tmp);
2074
if(errno != 0 or tmp == arg or *tmp != '\0'
2075
or (retry_interval * 1000) > INT_MAX
2076
or retry_interval < 0){
2077
argp_error(state, "Bad retry interval");
2078
}
2079
break;
2080
case 133: /* --network-hook-dir */
2081
hookdir = arg;
2082
break;
2083
/*
2084
* These reproduce what we would get without ARGP_NO_HELP
2085
*/
2086
case '?': /* --help */
2087
argp_state_help(state, state->out_stream,
2088
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2089
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2090
case -3: /* --usage */
2091
argp_state_help(state, state->out_stream,
2092
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2093
case 'V': /* --version */
2094
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2095
exit(argp_err_exit_status);
2096
break;
2097
default:
2098
return ARGP_ERR_UNKNOWN;
2099
}
2100
return errno;
2101
}
2102
2103
struct argp argp = { .options = options, .parser = parse_opt,
2104
.args_doc = "",
2105
.doc = "Mandos client -- Get and decrypt"
2106
" passwords from a Mandos server" };
2107
ret = argp_parse(&argp, argc, argv,
2108
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2109
switch(ret){
2110
case 0:
2111
break;
2112
case ENOMEM:
2113
default:
2114
errno = ret;
2115
perror_plus("argp_parse");
2116
exitcode = EX_OSERR;
2117
goto end;
2118
case EINVAL:
2119
exitcode = EX_USAGE;
2120
goto end;
2121
}
2122
}
2123
2124
{
2125
/* Work around Debian bug #633582:
2126
<http://bugs.debian.org/633582> */
2127
2128
/* Re-raise privileges */
2129
ret_errno = raise_privileges();
2130
if(ret_errno != 0){
2131
errno = ret_errno;
2132
perror_plus("Failed to raise privileges");
2133
} else {
2134
struct stat st;
2135
2136
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2137
int seckey_fd = open(seckey, O_RDONLY);
2138
if(seckey_fd == -1){
2139
perror_plus("open");
2140
} else {
2141
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2142
if(ret == -1){
2143
perror_plus("fstat");
2144
} else {
2145
if(S_ISREG(st.st_mode)
2146
and st.st_uid == 0 and st.st_gid == 0){
2147
ret = fchown(seckey_fd, uid, gid);
2148
if(ret == -1){
2149
perror_plus("fchown");
2150
}
2151
}
2152
}
2153
TEMP_FAILURE_RETRY(close(seckey_fd));
2154
}
2155
}
2156
2157
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2158
int pubkey_fd = open(pubkey, O_RDONLY);
2159
if(pubkey_fd == -1){
2160
perror_plus("open");
2161
} else {
2162
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2163
if(ret == -1){
2164
perror_plus("fstat");
2165
} else {
2166
if(S_ISREG(st.st_mode)
2167
and st.st_uid == 0 and st.st_gid == 0){
2168
ret = fchown(pubkey_fd, uid, gid);
2169
if(ret == -1){
2170
perror_plus("fchown");
2171
}
2172
}
2173
}
2174
TEMP_FAILURE_RETRY(close(pubkey_fd));
2175
}
2176
}
2177
2178
/* Lower privileges */
2179
ret_errno = lower_privileges();
2180
if(ret_errno != 0){
2181
errno = ret_errno;
2182
perror_plus("Failed to lower privileges");
2183
}
2184
}
2185
}
2186
2187
/* Remove invalid interface names (except "none") */
2188
{
2189
char *interface = NULL;
2190
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2191
interface))){
2192
if(strcmp(interface, "none") != 0
2193
and if_nametoindex(interface) == 0){
2194
if(interface[0] != '\0'){
2195
fprintf_plus(stderr, "Not using nonexisting interface"
2196
" \"%s\"\n", interface);
2197
}
2198
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2199
interface = NULL;
2200
}
2201
}
2202
}
2203
2204
/* Run network hooks */
2205
{
2206
if(mc.interfaces != NULL){
2207
interfaces_hooks = malloc(mc.interfaces_size);
2208
if(interfaces_hooks == NULL){
2209
perror_plus("malloc");
954
2210
goto end;
955
2211
}
956
*address = '\0';
957
address = connect_to;
958
ret = start_mandos_communication(address, port, if_index, &mc);
959
if(ret < 0){
960
exitcode = EXIT_FAILURE;
961
} else {
962
exitcode = EXIT_SUCCESS;
963
}
964
goto end;
965
}
966
967
if (not debug){
968
avahi_set_log_function(empty_log);
969
}
970
971
/* Initialize the pseudo-RNG for Avahi */
972
srand((unsigned int) time(NULL));
973
974
/* Allocate main Avahi loop object */
975
mc.simple_poll = avahi_simple_poll_new();
976
if (mc.simple_poll == NULL) {
977
fprintf(stderr, "Avahi: Failed to create simple poll"
978
" object.\n");
979
exitcode = EXIT_FAILURE;
980
goto end;
981
}
982
983
{
984
AvahiServerConfig config;
985
/* Do not publish any local Zeroconf records */
986
avahi_server_config_init(&config);
987
config.publish_hinfo = 0;
988
config.publish_addresses = 0;
989
config.publish_workstation = 0;
990
config.publish_domain = 0;
991
992
/* Allocate a new server */
993
mc.server = avahi_server_new(avahi_simple_poll_get
994
(mc.simple_poll), &config, NULL,
995
NULL, &error);
996
997
/* Free the Avahi configuration data */
998
avahi_server_config_free(&config);
999
}
1000
1001
/* Check if creating the Avahi server object succeeded */
1002
if (mc.server == NULL) {
1003
fprintf(stderr, "Failed to create Avahi server: %s\n",
1004
avahi_strerror(error));
1005
exitcode = EXIT_FAILURE;
1006
goto end;
1007
}
1008
1009
/* Create the Avahi service browser */
1010
sb = avahi_s_service_browser_new(mc.server, if_index,
1011
AVAHI_PROTO_INET6,
1012
"_mandos._tcp", NULL, 0,
1013
browse_callback, &mc);
1014
if (sb == NULL) {
1015
fprintf(stderr, "Failed to create service browser: %s\n",
1016
avahi_strerror(avahi_server_errno(mc.server)));
1017
exitcode = EXIT_FAILURE;
1018
goto end;
1019
}
1020
1021
/* Run the main loop */
1022
1023
if (debug){
1024
fprintf(stderr, "Starting Avahi loop search\n");
1025
}
1026
1027
avahi_simple_poll_loop(mc.simple_poll);
1028
2212
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2213
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2214
}
2215
run_network_hooks("start", interfaces_hooks != NULL ?
2216
interfaces_hooks : "", delay);
2217
}
2218
2219
if(not debug){
2220
avahi_set_log_function(empty_log);
2221
}
2222
2223
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2224
from the signal handler */
2225
/* Initialize the pseudo-RNG for Avahi */
2226
srand((unsigned int) time(NULL));
2227
simple_poll = avahi_simple_poll_new();
2228
if(simple_poll == NULL){
2229
fprintf_plus(stderr,
2230
"Avahi: Failed to create simple poll object.\n");
2231
exitcode = EX_UNAVAILABLE;
2232
goto end;
2233
}
2234
2235
sigemptyset(&sigterm_action.sa_mask);
2236
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2237
if(ret == -1){
2238
perror_plus("sigaddset");
2239
exitcode = EX_OSERR;
2240
goto end;
2241
}
2242
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2243
if(ret == -1){
2244
perror_plus("sigaddset");
2245
exitcode = EX_OSERR;
2246
goto end;
2247
}
2248
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2249
if(ret == -1){
2250
perror_plus("sigaddset");
2251
exitcode = EX_OSERR;
2252
goto end;
2253
}
2254
/* Need to check if the handler is SIG_IGN before handling:
2255
| [[info:libc:Initial Signal Actions]] |
2256
| [[info:libc:Basic Signal Handling]] |
2257
*/
2258
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2259
if(ret == -1){
2260
perror_plus("sigaction");
2261
return EX_OSERR;
2262
}
2263
if(old_sigterm_action.sa_handler != SIG_IGN){
2264
ret = sigaction(SIGINT, &sigterm_action, NULL);
2265
if(ret == -1){
2266
perror_plus("sigaction");
2267
exitcode = EX_OSERR;
2268
goto end;
2269
}
2270
}
2271
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2272
if(ret == -1){
2273
perror_plus("sigaction");
2274
return EX_OSERR;
2275
}
2276
if(old_sigterm_action.sa_handler != SIG_IGN){
2277
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2278
if(ret == -1){
2279
perror_plus("sigaction");
2280
exitcode = EX_OSERR;
2281
goto end;
2282
}
2283
}
2284
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2285
if(ret == -1){
2286
perror_plus("sigaction");
2287
return EX_OSERR;
2288
}
2289
if(old_sigterm_action.sa_handler != SIG_IGN){
2290
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2291
if(ret == -1){
2292
perror_plus("sigaction");
2293
exitcode = EX_OSERR;
2294
goto end;
2295
}
2296
}
2297
2298
/* If no interfaces were specified, make a list */
2299
if(mc.interfaces == NULL){
2300
struct dirent **direntries;
2301
/* Look for any good interfaces */
2302
ret = scandir(sys_class_net, &direntries, good_interface,
2303
alphasort);
2304
if(ret >= 1){
2305
/* Add all found interfaces to interfaces list */
2306
for(int i = 0; i < ret; ++i){
2307
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2308
direntries[i]->d_name);
2309
if(ret_errno != 0){
2310
errno = ret_errno;
2311
perror_plus("argz_add");
2312
continue;
2313
}
2314
if(debug){
2315
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2316
direntries[i]->d_name);
2317
}
2318
}
2319
free(direntries);
2320
} else {
2321
free(direntries);
2322
fprintf_plus(stderr, "Could not find a network interface\n");
2323
exitcode = EXIT_FAILURE;
2324
goto end;
2325
}
2326
}
2327
2328
/* Bring up interfaces which are down, and remove any "none"s */
2329
{
2330
char *interface = NULL;
2331
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2332
interface))){
2333
/* If interface name is "none", stop bringing up interfaces.
2334
Also remove all instances of "none" from the list */
2335
if(strcmp(interface, "none") == 0){
2336
argz_delete(&mc.interfaces, &mc.interfaces_size,
2337
interface);
2338
interface = NULL;
2339
while((interface = argz_next(mc.interfaces,
2340
mc.interfaces_size, interface))){
2341
if(strcmp(interface, "none") == 0){
2342
argz_delete(&mc.interfaces, &mc.interfaces_size,
2343
interface);
2344
interface = NULL;
2345
}
2346
}
2347
break;
2348
}
2349
bool interface_was_up = interface_is_up(interface);
2350
errno = bring_up_interface(interface, delay);
2351
if(not interface_was_up){
2352
if(errno != 0){
2353
perror_plus("Failed to bring up interface");
2354
} else {
2355
errno = argz_add(&interfaces_to_take_down,
2356
&interfaces_to_take_down_size,
2357
interface);
2358
if(errno != 0){
2359
perror_plus("argz_add");
2360
}
2361
}
2362
}
2363
}
2364
if(debug and (interfaces_to_take_down == NULL)){
2365
fprintf_plus(stderr, "No interfaces were brought up\n");
2366
}
2367
}
2368
2369
/* If we only got one interface, explicitly use only that one */
2370
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2371
if(debug){
2372
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2373
mc.interfaces);
2374
}
2375
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2376
}
2377
2378
if(quit_now){
2379
goto end;
2380
}
2381
2382
ret = init_gnutls_global(pubkey, seckey, &mc);
2383
if(ret == -1){
2384
fprintf_plus(stderr, "init_gnutls_global failed\n");
2385
exitcode = EX_UNAVAILABLE;
2386
goto end;
2387
} else {
2388
gnutls_initialized = true;
2389
}
2390
2391
if(quit_now){
2392
goto end;
2393
}
2394
2395
/* Try /run/tmp before /tmp */
2396
tempdir = mkdtemp(run_tempdir);
2397
if(tempdir == NULL and errno == ENOENT){
2398
if(debug){
2399
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2400
run_tempdir, old_tempdir);
2401
}
2402
tempdir = mkdtemp(old_tempdir);
2403
}
2404
if(tempdir == NULL){
2405
perror_plus("mkdtemp");
2406
goto end;
2407
}
2408
2409
if(quit_now){
2410
goto end;
2411
}
2412
2413
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2414
fprintf_plus(stderr, "init_gpgme failed\n");
2415
exitcode = EX_UNAVAILABLE;
2416
goto end;
2417
} else {
2418
gpgme_initialized = true;
2419
}
2420
2421
if(quit_now){
2422
goto end;
2423
}
2424
2425
if(connect_to != NULL){
2426
/* Connect directly, do not use Zeroconf */
2427
/* (Mainly meant for debugging) */
2428
char *address = strrchr(connect_to, ':');
2429
2430
if(address == NULL){
2431
fprintf_plus(stderr, "No colon in address\n");
2432
exitcode = EX_USAGE;
2433
goto end;
2434
}
2435
2436
if(quit_now){
2437
goto end;
2438
}
2439
2440
in_port_t port;
2441
errno = 0;
2442
tmpmax = strtoimax(address+1, &tmp, 10);
2443
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2444
or tmpmax != (in_port_t)tmpmax){
2445
fprintf_plus(stderr, "Bad port number\n");
2446
exitcode = EX_USAGE;
2447
goto end;
2448
}
2449
2450
if(quit_now){
2451
goto end;
2452
}
2453
2454
port = (in_port_t)tmpmax;
2455
*address = '\0';
2456
/* Colon in address indicates IPv6 */
2457
int af;
2458
if(strchr(connect_to, ':') != NULL){
2459
af = AF_INET6;
2460
/* Accept [] around IPv6 address - see RFC 5952 */
2461
if(connect_to[0] == '[' and address[-1] == ']')
2462
{
2463
connect_to++;
2464
address[-1] = '\0';
2465
}
2466
} else {
2467
af = AF_INET;
2468
}
2469
address = connect_to;
2470
2471
if(quit_now){
2472
goto end;
2473
}
2474
2475
while(not quit_now){
2476
ret = start_mandos_communication(address, port, if_index, af,
2477
&mc);
2478
if(quit_now or ret == 0){
2479
break;
2480
}
2481
if(debug){
2482
fprintf_plus(stderr, "Retrying in %d seconds\n",
2483
(int)retry_interval);
2484
}
2485
sleep((unsigned int)retry_interval);
2486
}
2487
2488
if(not quit_now){
2489
exitcode = EXIT_SUCCESS;
2490
}
2491
2492
goto end;
2493
}
2494
2495
if(quit_now){
2496
goto end;
2497
}
2498
2499
{
2500
AvahiServerConfig config;
2501
/* Do not publish any local Zeroconf records */
2502
avahi_server_config_init(&config);
2503
config.publish_hinfo = 0;
2504
config.publish_addresses = 0;
2505
config.publish_workstation = 0;
2506
config.publish_domain = 0;
2507
2508
/* Allocate a new server */
2509
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2510
&config, NULL, NULL, &ret_errno);
2511
2512
/* Free the Avahi configuration data */
2513
avahi_server_config_free(&config);
2514
}
2515
2516
/* Check if creating the Avahi server object succeeded */
2517
if(mc.server == NULL){
2518
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2519
avahi_strerror(ret_errno));
2520
exitcode = EX_UNAVAILABLE;
2521
goto end;
2522
}
2523
2524
if(quit_now){
2525
goto end;
2526
}
2527
2528
/* Create the Avahi service browser */
2529
sb = avahi_s_service_browser_new(mc.server, if_index,
2530
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2531
NULL, 0, browse_callback,
2532
(void *)&mc);
2533
if(sb == NULL){
2534
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2535
avahi_strerror(avahi_server_errno(mc.server)));
2536
exitcode = EX_UNAVAILABLE;
2537
goto end;
2538
}
2539
2540
if(quit_now){
2541
goto end;
2542
}
2543
2544
/* Run the main loop */
2545
2546
if(debug){
2547
fprintf_plus(stderr, "Starting Avahi loop search\n");
2548
}
2549
2550
ret = avahi_loop_with_timeout(simple_poll,
2551
(int)(retry_interval * 1000), &mc);
2552
if(debug){
2553
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2554
(ret == 0) ? "successfully" : "with error");
2555
}
2556
1029
2557
end:
1030
1031
if (debug){
1032
fprintf(stderr, "%s exiting\n", argv[0]);
1033
}
1034
1035
/* Cleanup things */
1036
if (sb != NULL)
1037
avahi_s_service_browser_free(sb);
1038
1039
if (mc.server != NULL)
1040
avahi_server_free(mc.server);
1041
1042
if (mc.simple_poll != NULL)
1043
avahi_simple_poll_free(mc.simple_poll);
1044
free(pubkeyfilename);
1045
free(seckeyfilename);
1046
1047
if (gnutls_initalized){
1048
gnutls_certificate_free_credentials(mc.cred);
1049
gnutls_global_deinit ();
1050
}
1051
1052
return exitcode;
2558
2559
if(debug){
2560
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2561
}
2562
2563
/* Cleanup things */
2564
free(mc.interfaces);
2565
2566
if(sb != NULL)
2567
avahi_s_service_browser_free(sb);
2568
2569
if(mc.server != NULL)
2570
avahi_server_free(mc.server);
2571
2572
if(simple_poll != NULL)
2573
avahi_simple_poll_free(simple_poll);
2574
2575
if(gnutls_initialized){
2576
gnutls_certificate_free_credentials(mc.cred);
2577
gnutls_global_deinit();
2578
gnutls_dh_params_deinit(mc.dh_params);
2579
}
2580
2581
if(gpgme_initialized){
2582
gpgme_release(mc.ctx);
2583
}
2584
2585
/* Cleans up the circular linked list of Mandos servers the client
2586
has seen */
2587
if(mc.current_server != NULL){
2588
mc.current_server->prev->next = NULL;
2589
while(mc.current_server != NULL){
2590
server *next = mc.current_server->next;
2591
free(mc.current_server);
2592
mc.current_server = next;
2593
}
2594
}
2595
2596
/* Re-raise privileges */
2597
{
2598
ret_errno = raise_privileges();
2599
if(ret_errno != 0){
2600
perror_plus("Failed to raise privileges");
2601
} else {
2602
2603
/* Run network hooks */
2604
run_network_hooks("stop", interfaces_hooks != NULL ?
2605
interfaces_hooks : "", delay);
2606
2607
/* Take down the network interfaces which were brought up */
2608
{
2609
char *interface = NULL;
2610
while((interface=argz_next(interfaces_to_take_down,
2611
interfaces_to_take_down_size,
2612
interface))){
2613
ret_errno = take_down_interface(interface);
2614
if(ret_errno != 0){
2615
errno = ret_errno;
2616
perror_plus("Failed to take down interface");
2617
}
2618
}
2619
if(debug and (interfaces_to_take_down == NULL)){
2620
fprintf_plus(stderr, "No interfaces needed to be taken"
2621
" down\n");
2622
}
2623
}
2624
}
2625
2626
ret_errno = lower_privileges_permanently();
2627
if(ret_errno != 0){
2628
perror_plus("Failed to lower privileges permanently");
2629
}
2630
}
2631
2632
free(interfaces_to_take_down);
2633
free(interfaces_hooks);
2634
2635
/* Removes the GPGME temp directory and all files inside */
2636
if(tempdir != NULL){
2637
struct dirent **direntries = NULL;
2638
struct dirent *direntry = NULL;
2639
int numentries = scandir(tempdir, &direntries, notdotentries,
2640
alphasort);
2641
if(numentries > 0){
2642
for(int i = 0; i < numentries; i++){
2643
direntry = direntries[i];
2644
char *fullname = NULL;
2645
ret = asprintf(&fullname, "%s/%s", tempdir,
2646
direntry->d_name);
2647
if(ret < 0){
2648
perror_plus("asprintf");
2649
continue;
2650
}
2651
ret = remove(fullname);
2652
if(ret == -1){
2653
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2654
strerror(errno));
2655
}
2656
free(fullname);
2657
}
2658
}
2659
2660
/* need to clean even if 0 because man page doesn't specify */
2661
free(direntries);
2662
if(numentries == -1){
2663
perror_plus("scandir");
2664
}
2665
ret = rmdir(tempdir);
2666
if(ret == -1 and errno != ENOENT){
2667
perror_plus("rmdir");
2668
}
2669
}
2670
2671
if(quit_now){
2672
sigemptyset(&old_sigterm_action.sa_mask);
2673
old_sigterm_action.sa_handler = SIG_DFL;
2674
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2675
&old_sigterm_action,
2676
NULL));
2677
if(ret == -1){
2678
perror_plus("sigaction");
2679
}
2680
do {
2681
ret = raise(signal_received);
2682
} while(ret != 0 and errno == EINTR);
2683
if(ret != 0){
2684
perror_plus("raise");
2685
abort();
2686
}
2687
TEMP_FAILURE_RETRY(pause());
2688
}
2689
2690
return exitcode;
1053
2691
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0