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- Committer: Teddy Hogeborn
- Date: 2008-08-10 17:52:54 UTC
- Revision ID: teddy@fukt.bsnet.se-20080810175254-pxjzwws523ji49n7
* Makefile (DOCBOOKTOMAN): Do not generate AUTHORS section.
- files added:
- network-protocol.txt
- files removed:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- network-hooks.d
- files renamed:
- plugin-runner.c => mandos-client.c
- plugin-runner.xml => mandos-client.xml
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.xml
- files modified:
- Makefile
added
removed
plugins.d/password-request.c
1
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
* Mandos-client - get and decrypt data from a Mandos server
3
* Mandos client - get and decrypt data from a Mandos server
4
4
*
5
5
* This program is partly derived from an example program for an Avahi
6
6
* service browser, downloaded from
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2013 Teddy Hogeborn
13
* Copyright © 2008-2013 Björn Påhlsson
12
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
14
13
*
15
14
* This program is free software: you can redistribute it and/or
16
15
* modify it under the terms of the GNU General Public License as
26
25
* along with this program. If not, see
27
26
* <http://www.gnu.org/licenses/>.
28
27
*
29
* Contact the authors at <mandos@recompile.se>.
28
* Contact the authors at <mandos@fukt.bsnet.se>.
30
29
*/
31
30
32
31
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
34
32
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
37
33
#define _FILE_OFFSET_BITS 64
38
#endif
39
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
34
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
36
37
#include <stdio.h> /* fprintf(), stderr, fwrite(), stdout,
38
ferror() */
39
#include <stdint.h> /* uint16_t, uint32_t */
45
40
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
#include <stdbool.h> /* bool, false, true */
41
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
42
srand() */
43
#include <stdbool.h> /* bool, true */
49
44
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
45
strerror(), memcpy(), strcpy() */
46
#include <sys/ioctl.h> /* ioctl */
47
#include <net/if.h> /* ifreq, SIOCGIFFLAGS, SIOCSIFFLAGS,
48
IFF_UP */
52
49
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
50
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
51
SOCK_STREAM, INET6_ADDRSTRLEN,
52
uid_t, gid_t */
53
#include <inttypes.h> /* PRIu16 */
57
54
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
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() */
55
struct in6_addr, inet_pton(),
56
connect() */
57
#include <assert.h> /* assert() */
58
#include <errno.h> /* perror(), errno */
59
#include <time.h> /* time() */
68
60
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
61
SIOCSIFFLAGS, if_indextoname(),
70
62
if_nametoindex(), IF_NAMESIZE */
71
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
*/
74
63
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons() */
78
#include <iso646.h> /* not, or, and */
64
getuid(), getgid(), setuid(),
65
setgid() */
66
#include <netinet/in.h>
67
#include <arpa/inet.h> /* inet_pton(), htons */
68
#include <iso646.h> /* not, and */
79
69
#include <argp.h> /* struct argp_option, error_t, struct
80
70
argp_state, struct argp,
81
71
argp_parse(), ARGP_KEY_ARG,
82
72
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__ */
101
73
102
74
/* Avahi */
103
75
/* All Avahi types, constants and functions
111
83
#include <avahi-common/error.h>
112
84
113
85
/* GnuTLS */
114
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
115
functions:
86
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and functions
116
87
gnutls_*
117
88
init_gnutls_session(),
118
89
GNUTLS_* */
119
#include <gnutls/openpgp.h>
120
/* gnutls_certificate_set_openpgp_key_file(),
121
GNUTLS_OPENPGP_FMT_BASE64 */
90
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
91
GNUTLS_OPENPGP_FMT_BASE64 */
122
92
123
93
/* GPGME */
124
#include <gpgme.h> /* All GPGME types, constants and
125
functions:
94
#include <gpgme.h> /* All GPGME types, constants and functions
126
95
gpgme_*
127
96
GPGME_PROTOCOL_OpenPGP,
128
97
GPG_ERR_NO_* */
129
98
130
99
#define BUFFER_SIZE 256
131
100
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
137
101
bool debug = false;
102
static const char *keydir = "/conf/conf.d/mandos";
138
103
static const char mandos_protocol_version[] = "1";
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
uid_t uid = 65534;
145
gid_t gid = 65534;
146
147
/* Doubly linked list that need to be circularly linked when used */
148
typedef struct server{
149
const char *ip;
150
in_port_t port;
151
AvahiIfIndex if_index;
152
int af;
153
struct timespec last_seen;
154
struct server *next;
155
struct server *prev;
156
} server;
104
const char *argp_program_version = "password-request 1.0";
105
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
157
106
158
107
/* Used for passing in values through the Avahi callback functions */
159
108
typedef struct {
109
AvahiSimplePoll *simple_poll;
160
110
AvahiServer *server;
161
111
gnutls_certificate_credentials_t cred;
162
112
unsigned int dh_bits;
163
113
gnutls_dh_params_t dh_params;
164
114
const char *priority;
165
gpgme_ctx_t ctx;
166
server *current_server;
167
char *interfaces;
168
size_t interfaces_size;
169
115
} mandos_context;
170
116
171
/* global so signal handler can reach it*/
172
AvahiSimplePoll *simple_poll;
173
174
sig_atomic_t quit_now = 0;
175
int signal_received = 0;
176
177
/* Function to use when printing errors */
178
void perror_plus(const char *print_text){
179
int e = errno;
180
fprintf(stderr, "Mandos plugin %s: ",
181
program_invocation_short_name);
182
errno = e;
183
perror(print_text);
184
}
185
186
__attribute__((format (gnu_printf, 2, 3)))
187
int fprintf_plus(FILE *stream, const char *format, ...){
188
va_list ap;
189
va_start (ap, format);
190
191
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
192
program_invocation_short_name));
193
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
194
}
195
196
117
/*
197
* Make additional room in "buffer" for at least BUFFER_SIZE more
198
* bytes. "buffer_capacity" is how much is currently allocated,
118
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
119
* "buffer_capacity" is how much is currently allocated,
199
120
* "buffer_length" is how much is already used.
200
121
*/
201
size_t incbuffer(char **buffer, size_t buffer_length,
202
size_t buffer_capacity){
203
if(buffer_length + BUFFER_SIZE > buffer_capacity){
204
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
205
if(new_buf == NULL){
206
int old_errno = errno;
207
free(*buffer);
208
errno = old_errno;
209
*buffer = NULL;
122
size_t adjustbuffer(char **buffer, size_t buffer_length,
123
size_t buffer_capacity){
124
if (buffer_length + BUFFER_SIZE > buffer_capacity){
125
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
126
if (buffer == NULL){
210
127
return 0;
211
128
}
212
*buffer = new_buf;
213
129
buffer_capacity += BUFFER_SIZE;
214
130
}
215
131
return buffer_capacity;
216
132
}
217
133
218
/* Add server to set of servers to retry periodically */
219
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
220
int af, server **current_server){
221
int ret;
222
server *new_server = malloc(sizeof(server));
223
if(new_server == NULL){
224
perror_plus("malloc");
225
return false;
226
}
227
*new_server = (server){ .ip = strdup(ip),
228
.port = port,
229
.if_index = if_index,
230
.af = af };
231
if(new_server->ip == NULL){
232
perror_plus("strdup");
233
return false;
234
}
235
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
236
if(ret == -1){
237
perror_plus("clock_gettime");
238
return false;
239
}
240
/* Special case of first server */
241
if(*current_server == NULL){
242
new_server->next = new_server;
243
new_server->prev = new_server;
244
*current_server = new_server;
245
/* Place the new server last in the list */
246
} else {
247
new_server->next = *current_server;
248
new_server->prev = (*current_server)->prev;
249
new_server->prev->next = new_server;
250
(*current_server)->prev = new_server;
251
}
252
return true;
253
}
254
255
134
/*
256
* Initialize GPGME.
135
* Decrypt OpenPGP data using keyrings in HOMEDIR.
136
* Returns -1 on error
257
137
*/
258
static bool init_gpgme(const char *seckey, const char *pubkey,
259
const char *tempdir, mandos_context *mc){
138
static ssize_t pgp_packet_decrypt (const char *cryptotext,
139
size_t crypto_size,
140
char **plaintext,
141
const char *homedir){
142
gpgme_data_t dh_crypto, dh_plain;
143
gpgme_ctx_t ctx;
260
144
gpgme_error_t rc;
145
ssize_t ret;
146
size_t plaintext_capacity = 0;
147
ssize_t plaintext_length = 0;
261
148
gpgme_engine_info_t engine_info;
262
149
263
/*
264
* Helper function to insert pub and seckey to the engine keyring.
265
*/
266
bool import_key(const char *filename){
267
int ret;
268
int fd;
269
gpgme_data_t pgp_data;
270
271
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
272
if(fd == -1){
273
perror_plus("open");
274
return false;
275
}
276
277
rc = gpgme_data_new_from_fd(&pgp_data, fd);
278
if(rc != GPG_ERR_NO_ERROR){
279
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
280
gpgme_strsource(rc), gpgme_strerror(rc));
281
return false;
282
}
283
284
rc = gpgme_op_import(mc->ctx, pgp_data);
285
if(rc != GPG_ERR_NO_ERROR){
286
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
287
gpgme_strsource(rc), gpgme_strerror(rc));
288
return false;
289
}
290
291
ret = (int)TEMP_FAILURE_RETRY(close(fd));
292
if(ret == -1){
293
perror_plus("close");
294
}
295
gpgme_data_release(pgp_data);
296
return true;
297
}
298
299
if(debug){
300
fprintf_plus(stderr, "Initializing GPGME\n");
150
if (debug){
151
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
301
152
}
302
153
303
154
/* Init GPGME */
304
155
gpgme_check_version(NULL);
305
156
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
306
if(rc != GPG_ERR_NO_ERROR){
307
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
308
gpgme_strsource(rc), gpgme_strerror(rc));
309
return false;
157
if (rc != GPG_ERR_NO_ERROR){
158
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
159
gpgme_strsource(rc), gpgme_strerror(rc));
160
return -1;
310
161
}
311
162
312
163
/* Set GPGME home directory for the OpenPGP engine only */
313
rc = gpgme_get_engine_info(&engine_info);
314
if(rc != GPG_ERR_NO_ERROR){
315
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
316
gpgme_strsource(rc), gpgme_strerror(rc));
317
return false;
164
rc = gpgme_get_engine_info (&engine_info);
165
if (rc != GPG_ERR_NO_ERROR){
166
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
167
gpgme_strsource(rc), gpgme_strerror(rc));
168
return -1;
318
169
}
319
170
while(engine_info != NULL){
320
171
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
321
172
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
322
engine_info->file_name, tempdir);
173
engine_info->file_name, homedir);
323
174
break;
324
175
}
325
176
engine_info = engine_info->next;
326
177
}
327
178
if(engine_info == NULL){
328
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
329
tempdir);
330
return false;
331
}
332
333
/* Create new GPGME "context" */
334
rc = gpgme_new(&(mc->ctx));
335
if(rc != GPG_ERR_NO_ERROR){
336
fprintf_plus(stderr, "Mandos plugin mandos-client: "
337
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
338
gpgme_strerror(rc));
339
return false;
340
}
341
342
if(not import_key(pubkey) or not import_key(seckey)){
343
return false;
344
}
345
346
return true;
347
}
348
349
/*
350
* Decrypt OpenPGP data.
351
* Returns -1 on error
352
*/
353
static ssize_t pgp_packet_decrypt(const char *cryptotext,
354
size_t crypto_size,
355
char **plaintext,
356
mandos_context *mc){
357
gpgme_data_t dh_crypto, dh_plain;
358
gpgme_error_t rc;
359
ssize_t ret;
360
size_t plaintext_capacity = 0;
361
ssize_t plaintext_length = 0;
362
363
if(debug){
364
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
179
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
180
return -1;
365
181
}
366
182
367
183
/* Create new GPGME data buffer from memory cryptotext */
368
184
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
369
185
0);
370
if(rc != GPG_ERR_NO_ERROR){
371
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
372
gpgme_strsource(rc), gpgme_strerror(rc));
186
if (rc != GPG_ERR_NO_ERROR){
187
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
188
gpgme_strsource(rc), gpgme_strerror(rc));
373
189
return -1;
374
190
}
375
191
376
192
/* Create new empty GPGME data buffer for the plaintext */
377
193
rc = gpgme_data_new(&dh_plain);
378
if(rc != GPG_ERR_NO_ERROR){
379
fprintf_plus(stderr, "Mandos plugin mandos-client: "
380
"bad gpgme_data_new: %s: %s\n",
381
gpgme_strsource(rc), gpgme_strerror(rc));
194
if (rc != GPG_ERR_NO_ERROR){
195
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
196
gpgme_strsource(rc), gpgme_strerror(rc));
382
197
gpgme_data_release(dh_crypto);
383
198
return -1;
384
199
}
385
200
201
/* Create new GPGME "context" */
202
rc = gpgme_new(&ctx);
203
if (rc != GPG_ERR_NO_ERROR){
204
fprintf(stderr, "bad gpgme_new: %s: %s\n",
205
gpgme_strsource(rc), gpgme_strerror(rc));
206
plaintext_length = -1;
207
goto decrypt_end;
208
}
209
386
210
/* Decrypt data from the cryptotext data buffer to the plaintext
387
211
data buffer */
388
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
389
if(rc != GPG_ERR_NO_ERROR){
390
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
391
gpgme_strsource(rc), gpgme_strerror(rc));
212
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
213
if (rc != GPG_ERR_NO_ERROR){
214
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
215
gpgme_strsource(rc), gpgme_strerror(rc));
392
216
plaintext_length = -1;
393
if(debug){
394
gpgme_decrypt_result_t result;
395
result = gpgme_op_decrypt_result(mc->ctx);
396
if(result == NULL){
397
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
398
} else {
399
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
400
result->unsupported_algorithm);
401
fprintf_plus(stderr, "Wrong key usage: %u\n",
402
result->wrong_key_usage);
403
if(result->file_name != NULL){
404
fprintf_plus(stderr, "File name: %s\n", result->file_name);
405
}
406
gpgme_recipient_t recipient;
407
recipient = result->recipients;
217
goto decrypt_end;
218
}
219
220
if(debug){
221
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
222
}
223
224
if (debug){
225
gpgme_decrypt_result_t result;
226
result = gpgme_op_decrypt_result(ctx);
227
if (result == NULL){
228
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
229
} else {
230
fprintf(stderr, "Unsupported algorithm: %s\n",
231
result->unsupported_algorithm);
232
fprintf(stderr, "Wrong key usage: %u\n",
233
result->wrong_key_usage);
234
if(result->file_name != NULL){
235
fprintf(stderr, "File name: %s\n", result->file_name);
236
}
237
gpgme_recipient_t recipient;
238
recipient = result->recipients;
239
if(recipient){
408
240
while(recipient != NULL){
409
fprintf_plus(stderr, "Public key algorithm: %s\n",
410
gpgme_pubkey_algo_name
411
(recipient->pubkey_algo));
412
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
413
fprintf_plus(stderr, "Secret key available: %s\n",
414
recipient->status == GPG_ERR_NO_SECKEY
415
? "No" : "Yes");
241
fprintf(stderr, "Public key algorithm: %s\n",
242
gpgme_pubkey_algo_name(recipient->pubkey_algo));
243
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
244
fprintf(stderr, "Secret key available: %s\n",
245
recipient->status == GPG_ERR_NO_SECKEY
246
? "No" : "Yes");
416
247
recipient = recipient->next;
417
248
}
418
249
}
419
250
}
420
goto decrypt_end;
421
}
422
423
if(debug){
424
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
425
251
}
426
252
427
253
/* Seek back to the beginning of the GPGME plaintext data buffer */
428
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
429
perror_plus("gpgme_data_seek");
254
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
255
perror("pgpme_data_seek");
430
256
plaintext_length = -1;
431
257
goto decrypt_end;
432
258
}
433
259
434
260
*plaintext = NULL;
435
261
while(true){
436
plaintext_capacity = incbuffer(plaintext,
437
(size_t)plaintext_length,
438
plaintext_capacity);
439
if(plaintext_capacity == 0){
440
perror_plus("incbuffer");
441
plaintext_length = -1;
442
goto decrypt_end;
262
plaintext_capacity = adjustbuffer(plaintext,
263
(size_t)plaintext_length,
264
plaintext_capacity);
265
if (plaintext_capacity == 0){
266
perror("adjustbuffer");
267
plaintext_length = -1;
268
goto decrypt_end;
443
269
}
444
270
445
271
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
446
272
BUFFER_SIZE);
447
273
/* Print the data, if any */
448
if(ret == 0){
274
if (ret == 0){
449
275
/* EOF */
450
276
break;
451
277
}
452
278
if(ret < 0){
453
perror_plus("gpgme_data_read");
279
perror("gpgme_data_read");
454
280
plaintext_length = -1;
455
281
goto decrypt_end;
456
282
}
457
283
plaintext_length += ret;
458
284
}
459
285
460
286
if(debug){
461
fprintf_plus(stderr, "Decrypted password is: ");
287
fprintf(stderr, "Decrypted password is: ");
462
288
for(ssize_t i = 0; i < plaintext_length; i++){
463
289
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
464
290
}
475
301
return plaintext_length;
476
302
}
477
303
478
static const char * safer_gnutls_strerror(int value){
479
const char *ret = gnutls_strerror(value);
480
if(ret == NULL)
304
static const char * safer_gnutls_strerror (int value) {
305
const char *ret = gnutls_strerror (value);
306
if (ret == NULL)
481
307
ret = "(unknown)";
482
308
return ret;
483
309
}
485
311
/* GnuTLS log function callback */
486
312
static void debuggnutls(__attribute__((unused)) int level,
487
313
const char* string){
488
fprintf_plus(stderr, "GnuTLS: %s", string);
314
fprintf(stderr, "GnuTLS: %s", string);
489
315
}
490
316
491
static int init_gnutls_global(const char *pubkeyfilename,
492
const char *seckeyfilename,
493
mandos_context *mc){
317
static int init_gnutls_global(mandos_context *mc,
318
const char *pubkeyfile,
319
const char *seckeyfile){
494
320
int ret;
495
321
496
322
if(debug){
497
fprintf_plus(stderr, "Initializing GnuTLS\n");
323
fprintf(stderr, "Initializing GnuTLS\n");
498
324
}
499
325
500
326
ret = gnutls_global_init();
501
if(ret != GNUTLS_E_SUCCESS){
502
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
503
safer_gnutls_strerror(ret));
327
if (ret != GNUTLS_E_SUCCESS) {
328
fprintf (stderr, "GnuTLS global_init: %s\n",
329
safer_gnutls_strerror(ret));
504
330
return -1;
505
331
}
506
332
507
if(debug){
333
if (debug){
508
334
/* "Use a log level over 10 to enable all debugging options."
509
335
* - GnuTLS manual
510
336
*/
513
339
}
514
340
515
341
/* OpenPGP credentials */
516
ret = gnutls_certificate_allocate_credentials(&mc->cred);
517
if(ret != GNUTLS_E_SUCCESS){
518
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
519
safer_gnutls_strerror(ret));
520
gnutls_global_deinit();
342
gnutls_certificate_allocate_credentials(&mc->cred);
343
if (ret != GNUTLS_E_SUCCESS){
344
fprintf (stderr, "GnuTLS memory error: %s\n",
345
safer_gnutls_strerror(ret));
346
gnutls_global_deinit ();
521
347
return -1;
522
348
}
523
349
524
350
if(debug){
525
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
526
" secret key %s as GnuTLS credentials\n",
527
pubkeyfilename,
528
seckeyfilename);
351
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
352
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
353
seckeyfile);
529
354
}
530
355
531
356
ret = gnutls_certificate_set_openpgp_key_file
532
(mc->cred, pubkeyfilename, seckeyfilename,
533
GNUTLS_OPENPGP_FMT_BASE64);
534
if(ret != GNUTLS_E_SUCCESS){
535
fprintf_plus(stderr,
536
"Error[%d] while reading the OpenPGP key pair ('%s',"
537
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
538
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
539
safer_gnutls_strerror(ret));
357
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
358
if (ret != GNUTLS_E_SUCCESS) {
359
fprintf(stderr,
360
"Error[%d] while reading the OpenPGP key pair ('%s',"
361
" '%s')\n", ret, pubkeyfile, seckeyfile);
362
fprintf(stdout, "The GnuTLS error is: %s\n",
363
safer_gnutls_strerror(ret));
540
364
goto globalfail;
541
365
}
542
366
543
367
/* GnuTLS server initialization */
544
368
ret = gnutls_dh_params_init(&mc->dh_params);
545
if(ret != GNUTLS_E_SUCCESS){
546
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
547
" initialization: %s\n",
548
safer_gnutls_strerror(ret));
369
if (ret != GNUTLS_E_SUCCESS) {
370
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
371
" %s\n", safer_gnutls_strerror(ret));
549
372
goto globalfail;
550
373
}
551
374
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
552
if(ret != GNUTLS_E_SUCCESS){
553
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
554
safer_gnutls_strerror(ret));
375
if (ret != GNUTLS_E_SUCCESS) {
376
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
377
safer_gnutls_strerror(ret));
555
378
goto globalfail;
556
379
}
557
380
558
381
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
559
382
560
383
return 0;
561
384
562
385
globalfail:
563
386
564
387
gnutls_certificate_free_credentials(mc->cred);
565
388
gnutls_global_deinit();
566
gnutls_dh_params_deinit(mc->dh_params);
567
389
return -1;
390
568
391
}
569
392
570
static int init_gnutls_session(gnutls_session_t *session,
571
mandos_context *mc){
393
static int init_gnutls_session(mandos_context *mc,
394
gnutls_session_t *session){
572
395
int ret;
573
396
/* GnuTLS session creation */
574
do {
575
ret = gnutls_init(session, GNUTLS_SERVER);
576
if(quit_now){
577
return -1;
578
}
579
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
580
if(ret != GNUTLS_E_SUCCESS){
581
fprintf_plus(stderr,
582
"Error in GnuTLS session initialization: %s\n",
583
safer_gnutls_strerror(ret));
397
ret = gnutls_init(session, GNUTLS_SERVER);
398
if (ret != GNUTLS_E_SUCCESS){
399
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
400
safer_gnutls_strerror(ret));
584
401
}
585
402
586
403
{
587
404
const char *err;
588
do {
589
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
590
if(quit_now){
591
gnutls_deinit(*session);
592
return -1;
593
}
594
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
595
if(ret != GNUTLS_E_SUCCESS){
596
fprintf_plus(stderr, "Syntax error at: %s\n", err);
597
fprintf_plus(stderr, "GnuTLS error: %s\n",
598
safer_gnutls_strerror(ret));
599
gnutls_deinit(*session);
405
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
406
if (ret != GNUTLS_E_SUCCESS) {
407
fprintf(stderr, "Syntax error at: %s\n", err);
408
fprintf(stderr, "GnuTLS error: %s\n",
409
safer_gnutls_strerror(ret));
410
gnutls_deinit (*session);
600
411
return -1;
601
412
}
602
413
}
603
414
604
do {
605
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
606
mc->cred);
607
if(quit_now){
608
gnutls_deinit(*session);
609
return -1;
610
}
611
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
612
if(ret != GNUTLS_E_SUCCESS){
613
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
614
safer_gnutls_strerror(ret));
615
gnutls_deinit(*session);
415
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
416
mc->cred);
417
if (ret != GNUTLS_E_SUCCESS) {
418
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
419
safer_gnutls_strerror(ret));
420
gnutls_deinit (*session);
616
421
return -1;
617
422
}
618
423
619
424
/* ignore client certificate if any. */
620
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
425
gnutls_certificate_server_set_request (*session,
426
GNUTLS_CERT_IGNORE);
621
427
622
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
428
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
623
429
624
430
return 0;
625
431
}
629
435
__attribute__((unused)) const char *txt){}
630
436
631
437
/* Called when a Mandos server is found */
632
static int start_mandos_communication(const char *ip, in_port_t port,
438
static int start_mandos_communication(const char *ip, uint16_t port,
633
439
AvahiIfIndex if_index,
634
int af, mandos_context *mc){
635
int ret, tcp_sd = -1;
636
ssize_t sret;
637
struct sockaddr_storage to;
440
mandos_context *mc){
441
int ret, tcp_sd;
442
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
638
443
char *buffer = NULL;
639
char *decrypted_buffer = NULL;
444
char *decrypted_buffer;
640
445
size_t buffer_length = 0;
641
446
size_t buffer_capacity = 0;
447
ssize_t decrypted_buffer_size;
642
448
size_t written;
643
int retval = -1;
449
int retval = 0;
450
char interface[IF_NAMESIZE];
644
451
gnutls_session_t session;
645
int pf; /* Protocol family */
646
647
errno = 0;
648
649
if(quit_now){
650
errno = EINTR;
651
return -1;
652
}
653
654
switch(af){
655
case AF_INET6:
656
pf = PF_INET6;
657
break;
658
case AF_INET:
659
pf = PF_INET;
660
break;
661
default:
662
fprintf_plus(stderr, "Bad address family: %d\n", af);
663
errno = EINVAL;
664
return -1;
665
}
666
667
/* If the interface is specified and we have a list of interfaces */
668
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
669
/* Check if the interface is one of the interfaces we are using */
670
bool match = false;
671
{
672
char *interface = NULL;
673
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
674
interface))){
675
if(if_nametoindex(interface) == (unsigned int)if_index){
676
match = true;
677
break;
678
}
679
}
680
}
681
if(not match){
682
/* This interface does not match any in the list, so we don't
683
connect to the server */
684
if(debug){
685
char interface[IF_NAMESIZE];
686
if(if_indextoname((unsigned int)if_index, interface) == NULL){
687
perror_plus("if_indextoname");
688
} else {
689
fprintf_plus(stderr, "Skipping server on non-used interface"
690
" \"%s\"\n",
691
if_indextoname((unsigned int)if_index,
692
interface));
693
}
694
}
452
453
ret = init_gnutls_session (mc, &session);
454
if (ret != 0){
455
return -1;
456
}
457
458
if(debug){
459
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
460
"\n", ip, port);
461
}
462
463
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
464
if(tcp_sd < 0) {
465
perror("socket");
466
return -1;
467
}
468
469
if(debug){
470
if(if_indextoname((unsigned int)if_index, interface) == NULL){
471
perror("if_indextoname");
695
472
return -1;
696
473
}
474
fprintf(stderr, "Binding to interface %s\n", interface);
697
475
}
698
476
699
ret = init_gnutls_session(&session, mc);
700
if(ret != 0){
477
memset(&to,0,sizeof(to)); /* Spurious warning */
478
to.in6.sin6_family = AF_INET6;
479
/* It would be nice to have a way to detect if we were passed an
480
IPv4 address here. Now we assume an IPv6 address. */
481
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
482
if (ret < 0 ){
483
perror("inet_pton");
701
484
return -1;
702
485
}
703
704
if(debug){
705
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
706
PRIuMAX "\n", ip, (uintmax_t)port);
707
}
708
709
tcp_sd = socket(pf, SOCK_STREAM, 0);
710
if(tcp_sd < 0){
711
int e = errno;
712
perror_plus("socket");
713
errno = e;
714
goto mandos_end;
715
}
716
717
if(quit_now){
718
errno = EINTR;
719
goto mandos_end;
720
}
721
722
memset(&to, 0, sizeof(to));
723
if(af == AF_INET6){
724
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
725
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
726
} else { /* IPv4 */
727
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
728
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
729
}
730
if(ret < 0 ){
731
int e = errno;
732
perror_plus("inet_pton");
733
errno = e;
734
goto mandos_end;
735
}
736
486
if(ret == 0){
737
int e = errno;
738
fprintf_plus(stderr, "Bad address: %s\n", ip);
739
errno = e;
740
goto mandos_end;
741
}
742
if(af == AF_INET6){
743
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
744
if(IN6_IS_ADDR_LINKLOCAL
745
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
746
if(if_index == AVAHI_IF_UNSPEC){
747
fprintf_plus(stderr, "An IPv6 link-local address is"
748
" incomplete without a network interface\n");
749
errno = EINVAL;
750
goto mandos_end;
751
}
752
/* Set the network interface number as scope */
753
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
754
}
755
} else {
756
((struct sockaddr_in *)&to)->sin_port = htons(port);
757
}
487
fprintf(stderr, "Bad address: %s\n", ip);
488
return -1;
489
}
490
to.in6.sin6_port = htons(port); /* Spurious warning */
758
491
759
if(quit_now){
760
errno = EINTR;
761
goto mandos_end;
762
}
492
to.in6.sin6_scope_id = (uint32_t)if_index;
763
493
764
494
if(debug){
765
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
766
char interface[IF_NAMESIZE];
767
if(if_indextoname((unsigned int)if_index, interface) == NULL){
768
perror_plus("if_indextoname");
769
} else {
770
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
771
"\n", ip, interface, (uintmax_t)port);
495
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
496
port);
497
char addrstr[INET6_ADDRSTRLEN] = "";
498
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
499
sizeof(addrstr)) == NULL){
500
perror("inet_ntop");
501
} else {
502
if(strcmp(addrstr, ip) != 0){
503
fprintf(stderr, "Canonical address form: %s\n", addrstr);
772
504
}
773
} else {
774
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
775
ip, (uintmax_t)port);
776
}
777
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
778
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
779
if(af == AF_INET6){
780
ret = getnameinfo((struct sockaddr *)&to,
781
sizeof(struct sockaddr_in6),
782
addrstr, sizeof(addrstr), NULL, 0,
783
NI_NUMERICHOST);
784
} else {
785
ret = getnameinfo((struct sockaddr *)&to,
786
sizeof(struct sockaddr_in),
787
addrstr, sizeof(addrstr), NULL, 0,
788
NI_NUMERICHOST);
789
}
790
if(ret == EAI_SYSTEM){
791
perror_plus("getnameinfo");
792
} else if(ret != 0) {
793
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
794
} else if(strcmp(addrstr, ip) != 0){
795
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
796
}
797
}
798
799
if(quit_now){
800
errno = EINTR;
801
goto mandos_end;
802
}
803
804
if(af == AF_INET6){
805
ret = connect(tcp_sd, (struct sockaddr *)&to,
806
sizeof(struct sockaddr_in6));
807
} else {
808
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
809
sizeof(struct sockaddr_in));
810
}
811
if(ret < 0){
812
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
813
int e = errno;
814
perror_plus("connect");
815
errno = e;
816
}
817
goto mandos_end;
818
}
819
820
if(quit_now){
821
errno = EINTR;
822
goto mandos_end;
823
}
824
505
}
506
}
507
508
ret = connect(tcp_sd, &to.in, sizeof(to));
509
if (ret < 0){
510
perror("connect");
511
return -1;
512
}
513
825
514
const char *out = mandos_protocol_version;
826
515
written = 0;
827
while(true){
516
while (true){
828
517
size_t out_size = strlen(out);
829
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
830
out_size - written));
831
if(ret == -1){
832
int e = errno;
833
perror_plus("write");
834
errno = e;
518
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
519
out_size - written));
520
if (ret == -1){
521
perror("write");
522
retval = -1;
835
523
goto mandos_end;
836
524
}
837
525
written += (size_t)ret;
838
526
if(written < out_size){
839
527
continue;
840
528
} else {
841
if(out == mandos_protocol_version){
529
if (out == mandos_protocol_version){
842
530
written = 0;
843
531
out = "\r\n";
844
532
} else {
845
533
break;
846
534
}
847
535
}
848
849
if(quit_now){
850
errno = EINTR;
851
goto mandos_end;
852
}
853
536
}
854
537
855
538
if(debug){
856
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
857
}
858
859
if(quit_now){
860
errno = EINTR;
861
goto mandos_end;
862
}
863
864
/* This casting via intptr_t is to eliminate warning about casting
865
an int to a pointer type. This is exactly how the GnuTLS Guile
866
function "set-session-transport-fd!" does it. */
867
gnutls_transport_set_ptr(session,
868
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
869
870
if(quit_now){
871
errno = EINTR;
872
goto mandos_end;
873
}
874
875
do {
876
ret = gnutls_handshake(session);
877
if(quit_now){
878
errno = EINTR;
879
goto mandos_end;
880
}
539
fprintf(stderr, "Establishing TLS session with %s\n", ip);
540
}
541
542
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
543
544
do{
545
ret = gnutls_handshake (session);
881
546
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
882
547
883
if(ret != GNUTLS_E_SUCCESS){
548
if (ret != GNUTLS_E_SUCCESS){
884
549
if(debug){
885
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
886
gnutls_perror(ret);
550
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
551
gnutls_perror (ret);
887
552
}
888
errno = EPROTO;
553
retval = -1;
889
554
goto mandos_end;
890
555
}
891
556
892
557
/* Read OpenPGP packet that contains the wanted password */
893
558
894
559
if(debug){
895
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
896
" %s\n", ip);
560
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
561
ip);
897
562
}
898
563
899
564
while(true){
900
901
if(quit_now){
902
errno = EINTR;
903
goto mandos_end;
904
}
905
906
buffer_capacity = incbuffer(&buffer, buffer_length,
907
buffer_capacity);
908
if(buffer_capacity == 0){
909
int e = errno;
910
perror_plus("incbuffer");
911
errno = e;
912
goto mandos_end;
913
}
914
915
if(quit_now){
916
errno = EINTR;
917
goto mandos_end;
918
}
919
920
sret = gnutls_record_recv(session, buffer+buffer_length,
921
BUFFER_SIZE);
922
if(sret == 0){
565
buffer_capacity = adjustbuffer(&buffer, buffer_length,
566
buffer_capacity);
567
if (buffer_capacity == 0){
568
perror("adjustbuffer");
569
retval = -1;
570
goto mandos_end;
571
}
572
573
ret = gnutls_record_recv(session, buffer+buffer_length,
574
BUFFER_SIZE);
575
if (ret == 0){
923
576
break;
924
577
}
925
if(sret < 0){
926
switch(sret){
578
if (ret < 0){
579
switch(ret){
927
580
case GNUTLS_E_INTERRUPTED:
928
581
case GNUTLS_E_AGAIN:
929
582
break;
930
583
case GNUTLS_E_REHANDSHAKE:
931
do {
932
ret = gnutls_handshake(session);
933
934
if(quit_now){
935
errno = EINTR;
936
goto mandos_end;
937
}
584
do{
585
ret = gnutls_handshake (session);
938
586
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
939
if(ret < 0){
940
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
941
"***\n");
942
gnutls_perror(ret);
943
errno = EPROTO;
587
if (ret < 0){
588
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
589
gnutls_perror (ret);
590
retval = -1;
944
591
goto mandos_end;
945
592
}
946
593
break;
947
594
default:
948
fprintf_plus(stderr, "Unknown error while reading data from"
949
" encrypted session with Mandos server\n");
950
gnutls_bye(session, GNUTLS_SHUT_RDWR);
951
errno = EIO;
595
fprintf(stderr, "Unknown error while reading data from"
596
" encrypted session with Mandos server\n");
597
retval = -1;
598
gnutls_bye (session, GNUTLS_SHUT_RDWR);
952
599
goto mandos_end;
953
600
}
954
601
} else {
955
buffer_length += (size_t) sret;
602
buffer_length += (size_t) ret;
956
603
}
957
604
}
958
605
959
606
if(debug){
960
fprintf_plus(stderr, "Closing TLS session\n");
961
}
962
963
if(quit_now){
964
errno = EINTR;
965
goto mandos_end;
966
}
967
968
do {
969
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
970
if(quit_now){
971
errno = EINTR;
972
goto mandos_end;
973
}
974
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
975
976
if(buffer_length > 0){
977
ssize_t decrypted_buffer_size;
978
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
979
&decrypted_buffer, mc);
980
if(decrypted_buffer_size >= 0){
981
607
fprintf(stderr, "Closing TLS session\n");
608
}
609
610
gnutls_bye (session, GNUTLS_SHUT_RDWR);
611
612
if (buffer_length > 0){
613
decrypted_buffer_size = pgp_packet_decrypt(buffer,
614
buffer_length,
615
&decrypted_buffer,
616
keydir);
617
if (decrypted_buffer_size >= 0){
982
618
written = 0;
983
619
while(written < (size_t) decrypted_buffer_size){
984
if(quit_now){
985
errno = EINTR;
986
goto mandos_end;
987
}
988
989
ret = (int)fwrite(decrypted_buffer + written, 1,
990
(size_t)decrypted_buffer_size - written,
991
stdout);
620
ret = (int)fwrite (decrypted_buffer + written, 1,
621
(size_t)decrypted_buffer_size - written,
622
stdout);
992
623
if(ret == 0 and ferror(stdout)){
993
int e = errno;
994
624
if(debug){
995
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
996
strerror(errno));
625
fprintf(stderr, "Error writing encrypted data: %s\n",
626
strerror(errno));
997
627
}
998
errno = e;
999
goto mandos_end;
628
retval = -1;
629
break;
1000
630
}
1001
631
written += (size_t)ret;
1002
632
}
1003
retval = 0;
633
free(decrypted_buffer);
634
} else {
635
retval = -1;
1004
636
}
1005
637
}
1006
638
1007
639
/* Shutdown procedure */
1008
640
1009
641
mandos_end:
1010
{
1011
int e = errno;
1012
free(decrypted_buffer);
1013
free(buffer);
1014
if(tcp_sd >= 0){
1015
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1016
}
1017
if(ret == -1){
1018
if(e == 0){
1019
e = errno;
1020
}
1021
perror_plus("close");
1022
}
1023
gnutls_deinit(session);
1024
errno = e;
1025
if(quit_now){
1026
errno = EINTR;
1027
retval = -1;
1028
}
1029
}
642
free(buffer);
643
close(tcp_sd);
644
gnutls_deinit (session);
1030
645
return retval;
1031
646
}
1032
647
1033
648
static void resolve_callback(AvahiSServiceResolver *r,
1034
649
AvahiIfIndex interface,
1035
AvahiProtocol proto,
650
AVAHI_GCC_UNUSED AvahiProtocol protocol,
1036
651
AvahiResolverEvent event,
1037
652
const char *name,
1038
653
const char *type,
1043
658
AVAHI_GCC_UNUSED AvahiStringList *txt,
1044
659
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1045
660
flags,
1046
void* mc){
1047
if(r == NULL){
1048
return;
1049
}
661
void* userdata) {
662
mandos_context *mc = userdata;
663
assert(r); /* Spurious warning */
1050
664
1051
665
/* Called whenever a service has been resolved successfully or
1052
666
timed out */
1053
667
1054
if(quit_now){
1055
return;
1056
}
1057
1058
switch(event){
668
switch (event) {
1059
669
default:
1060
670
case AVAHI_RESOLVER_FAILURE:
1061
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1062
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1063
domain,
1064
avahi_strerror(avahi_server_errno
1065
(((mandos_context*)mc)->server)));
671
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
672
" of type '%s' in domain '%s': %s\n", name, type, domain,
673
avahi_strerror(avahi_server_errno(mc->server)));
1066
674
break;
1067
675
1068
676
case AVAHI_RESOLVER_FOUND:
1070
678
char ip[AVAHI_ADDRESS_STR_MAX];
1071
679
avahi_address_snprint(ip, sizeof(ip), address);
1072
680
if(debug){
1073
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1074
PRIdMAX ") on port %" PRIu16 "\n", name,
1075
host_name, ip, (intmax_t)interface, port);
681
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
682
PRIu16 ") on port %d\n", name, host_name, ip,
683
interface, port);
1076
684
}
1077
int ret = start_mandos_communication(ip, (in_port_t)port,
1078
interface,
1079
avahi_proto_to_af(proto),
1080
mc);
1081
if(ret == 0){
1082
avahi_simple_poll_quit(simple_poll);
1083
} else {
1084
if(not add_server(ip, (in_port_t)port, interface,
1085
avahi_proto_to_af(proto),
1086
&((mandos_context*)mc)->current_server)){
1087
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1088
" list\n", name);
1089
}
685
int ret = start_mandos_communication(ip, port, interface, mc);
686
if (ret == 0){
687
exit(EXIT_SUCCESS);
1090
688
}
1091
689
}
1092
690
}
1093
691
avahi_s_service_resolver_free(r);
1094
692
}
1095
693
1096
static void browse_callback(AvahiSServiceBrowser *b,
1097
AvahiIfIndex interface,
1098
AvahiProtocol protocol,
1099
AvahiBrowserEvent event,
1100
const char *name,
1101
const char *type,
1102
const char *domain,
1103
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1104
flags,
1105
void* mc){
1106
if(b == NULL){
1107
return;
1108
}
694
static void browse_callback( AvahiSServiceBrowser *b,
695
AvahiIfIndex interface,
696
AvahiProtocol protocol,
697
AvahiBrowserEvent event,
698
const char *name,
699
const char *type,
700
const char *domain,
701
AVAHI_GCC_UNUSED AvahiLookupResultFlags
702
flags,
703
void* userdata) {
704
mandos_context *mc = userdata;
705
assert(b); /* Spurious warning */
1109
706
1110
707
/* Called whenever a new services becomes available on the LAN or
1111
708
is removed from the LAN */
1112
709
1113
if(quit_now){
1114
return;
1115
}
1116
1117
switch(event){
710
switch (event) {
1118
711
default:
1119
712
case AVAHI_BROWSER_FAILURE:
1120
713
1121
fprintf_plus(stderr, "(Avahi browser) %s\n",
1122
avahi_strerror(avahi_server_errno
1123
(((mandos_context*)mc)->server)));
1124
avahi_simple_poll_quit(simple_poll);
714
fprintf(stderr, "(Avahi browser) %s\n",
715
avahi_strerror(avahi_server_errno(mc->server)));
716
avahi_simple_poll_quit(mc->simple_poll);
1125
717
return;
1126
718
1127
719
case AVAHI_BROWSER_NEW:
1130
722
the callback function is called the Avahi server will free the
1131
723
resolver for us. */
1132
724
1133
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1134
interface, protocol, name, type,
1135
domain, protocol, 0,
1136
resolve_callback, mc) == NULL)
1137
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1138
" %s\n", name,
1139
avahi_strerror(avahi_server_errno
1140
(((mandos_context*)mc)->server)));
725
if (!(avahi_s_service_resolver_new(mc->server, interface,
726
protocol, name, type, domain,
727
AVAHI_PROTO_INET6, 0,
728
resolve_callback, mc)))
729
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
730
name, avahi_strerror(avahi_server_errno(mc->server)));
1141
731
break;
1142
732
1143
733
case AVAHI_BROWSER_REMOVE:
1146
736
case AVAHI_BROWSER_ALL_FOR_NOW:
1147
737
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1148
738
if(debug){
1149
fprintf_plus(stderr, "No Mandos server found, still"
1150
" searching...\n");
739
fprintf(stderr, "No Mandos server found, still searching...\n");
1151
740
}
1152
741
break;
1153
742
}
1154
743
}
1155
744
1156
/* Signal handler that stops main loop after SIGTERM */
1157
static void handle_sigterm(int sig){
1158
if(quit_now){
1159
return;
1160
}
1161
quit_now = 1;
1162
signal_received = sig;
1163
int old_errno = errno;
1164
/* set main loop to exit */
1165
if(simple_poll != NULL){
1166
avahi_simple_poll_quit(simple_poll);
1167
}
1168
errno = old_errno;
1169
}
1170
1171
bool get_flags(const char *ifname, struct ifreq *ifr){
1172
int ret;
1173
error_t ret_errno;
1174
1175
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1176
if(s < 0){
1177
ret_errno = errno;
1178
perror_plus("socket");
1179
errno = ret_errno;
1180
return false;
1181
}
1182
strcpy(ifr->ifr_name, ifname);
1183
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1184
if(ret == -1){
1185
if(debug){
1186
ret_errno = errno;
1187
perror_plus("ioctl SIOCGIFFLAGS");
1188
errno = ret_errno;
1189
}
1190
return false;
1191
}
1192
return true;
1193
}
1194
1195
bool good_flags(const char *ifname, const struct ifreq *ifr){
1196
1197
/* Reject the loopback device */
1198
if(ifr->ifr_flags & IFF_LOOPBACK){
1199
if(debug){
1200
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1201
ifname);
1202
}
1203
return false;
1204
}
1205
/* Accept point-to-point devices only if connect_to is specified */
1206
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1207
if(debug){
1208
fprintf_plus(stderr, "Accepting point-to-point interface"
1209
" \"%s\"\n", ifname);
1210
}
1211
return true;
1212
}
1213
/* Otherwise, reject non-broadcast-capable devices */
1214
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1215
if(debug){
1216
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1217
" \"%s\"\n", ifname);
1218
}
1219
return false;
1220
}
1221
/* Reject non-ARP interfaces (including dummy interfaces) */
1222
if(ifr->ifr_flags & IFF_NOARP){
1223
if(debug){
1224
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1225
ifname);
1226
}
1227
return false;
1228
}
1229
1230
/* Accept this device */
1231
if(debug){
1232
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1233
}
1234
return true;
1235
}
1236
1237
/*
1238
* This function determines if a directory entry in /sys/class/net
1239
* corresponds to an acceptable network device.
1240
* (This function is passed to scandir(3) as a filter function.)
1241
*/
1242
int good_interface(const struct dirent *if_entry){
1243
if(if_entry->d_name[0] == '.'){
1244
return 0;
1245
}
1246
1247
struct ifreq ifr;
1248
if(not get_flags(if_entry->d_name, &ifr)){
1249
if(debug){
1250
fprintf_plus(stderr, "Failed to get flags for interface "
1251
"\"%s\"\n", if_entry->d_name);
1252
}
1253
return 0;
1254
}
1255
1256
if(not good_flags(if_entry->d_name, &ifr)){
1257
return 0;
1258
}
1259
return 1;
1260
}
1261
1262
/*
1263
* This function determines if a network interface is up.
1264
*/
1265
bool interface_is_up(const char *interface){
1266
struct ifreq ifr;
1267
if(not get_flags(interface, &ifr)){
1268
if(debug){
1269
fprintf_plus(stderr, "Failed to get flags for interface "
1270
"\"%s\"\n", interface);
1271
}
1272
return false;
1273
}
1274
1275
return (bool)(ifr.ifr_flags & IFF_UP);
1276
}
1277
1278
/*
1279
* This function determines if a network interface is running
1280
*/
1281
bool interface_is_running(const char *interface){
1282
struct ifreq ifr;
1283
if(not get_flags(interface, &ifr)){
1284
if(debug){
1285
fprintf_plus(stderr, "Failed to get flags for interface "
1286
"\"%s\"\n", interface);
1287
}
1288
return false;
1289
}
1290
1291
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1292
}
1293
1294
int notdotentries(const struct dirent *direntry){
1295
/* Skip "." and ".." */
1296
if(direntry->d_name[0] == '.'
1297
and (direntry->d_name[1] == '\0'
1298
or (direntry->d_name[1] == '.'
1299
and direntry->d_name[2] == '\0'))){
1300
return 0;
1301
}
1302
return 1;
1303
}
1304
1305
/* Is this directory entry a runnable program? */
1306
int runnable_hook(const struct dirent *direntry){
1307
int ret;
1308
size_t sret;
1309
struct stat st;
1310
1311
if((direntry->d_name)[0] == '\0'){
1312
/* Empty name? */
1313
return 0;
1314
}
1315
1316
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1317
"abcdefghijklmnopqrstuvwxyz"
1318
"0123456789"
1319
"_-");
1320
if((direntry->d_name)[sret] != '\0'){
1321
/* Contains non-allowed characters */
1322
if(debug){
1323
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1324
direntry->d_name);
1325
}
1326
return 0;
1327
}
1328
1329
char *fullname = NULL;
1330
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1331
if(ret < 0){
1332
perror_plus("asprintf");
1333
return 0;
1334
}
1335
1336
ret = stat(fullname, &st);
1337
if(ret == -1){
1338
if(debug){
1339
perror_plus("Could not stat hook");
1340
}
1341
return 0;
1342
}
1343
if(not (S_ISREG(st.st_mode))){
1344
/* Not a regular file */
1345
if(debug){
1346
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1347
direntry->d_name);
1348
}
1349
return 0;
1350
}
1351
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1352
/* Not executable */
1353
if(debug){
1354
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1355
direntry->d_name);
1356
}
1357
return 0;
1358
}
1359
if(debug){
1360
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1361
direntry->d_name);
1362
}
1363
return 1;
1364
}
1365
1366
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1367
mandos_context *mc){
1368
int ret;
1369
struct timespec now;
1370
struct timespec waited_time;
1371
intmax_t block_time;
1372
1373
while(true){
1374
if(mc->current_server == NULL){
1375
if (debug){
1376
fprintf_plus(stderr, "Wait until first server is found."
1377
" No timeout!\n");
1378
}
1379
ret = avahi_simple_poll_iterate(s, -1);
745
/* Combines file name and path and returns the malloced new
746
string. some sane checks could/should be added */
747
static const char *combinepath(const char *first, const char *second){
748
size_t f_len = strlen(first);
749
size_t s_len = strlen(second);
750
char *tmp = malloc(f_len + s_len + 2);
751
if (tmp == NULL){
752
return NULL;
753
}
754
if(f_len > 0){
755
memcpy(tmp, first, f_len); /* Spurious warning */
756
}
757
tmp[f_len] = '/';
758
if(s_len > 0){
759
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
760
}
761
tmp[f_len + 1 + s_len] = '\0';
762
return tmp;
763
}
764
765
766
int main(int argc, char *argv[]){
767
AvahiSServiceBrowser *sb = NULL;
768
int error;
769
int ret;
770
int exitcode = EXIT_SUCCESS;
771
const char *interface = "eth0";
772
struct ifreq network;
773
int sd;
774
uid_t uid;
775
gid_t gid;
776
char *connect_to = NULL;
777
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
778
const char *pubkeyfile = "pubkey.txt";
779
const char *seckeyfile = "seckey.txt";
780
mandos_context mc = { .simple_poll = NULL, .server = NULL,
781
.dh_bits = 1024, .priority = "SECURE256"};
782
bool gnutls_initalized = false;
783
784
{
785
struct argp_option options[] = {
786
{ .name = "debug", .key = 128,
787
.doc = "Debug mode", .group = 3 },
788
{ .name = "connect", .key = 'c',
789
.arg = "IP",
790
.doc = "Connect directly to a sepcified mandos server",
791
.group = 1 },
792
{ .name = "interface", .key = 'i',
793
.arg = "INTERFACE",
794
.doc = "Interface that Avahi will conntect through",
795
.group = 1 },
796
{ .name = "keydir", .key = 'd',
797
.arg = "KEYDIR",
798
.doc = "Directory where the openpgp keyring is",
799
.group = 1 },
800
{ .name = "seckey", .key = 's',
801
.arg = "SECKEY",
802
.doc = "Secret openpgp key for gnutls authentication",
803
.group = 1 },
804
{ .name = "pubkey", .key = 'p',
805
.arg = "PUBKEY",
806
.doc = "Public openpgp key for gnutls authentication",
807
.group = 2 },
808
{ .name = "dh-bits", .key = 129,
809
.arg = "BITS",
810
.doc = "dh-bits to use in gnutls communication",
811
.group = 2 },
812
{ .name = "priority", .key = 130,
813
.arg = "PRIORITY",
814
.doc = "GNUTLS priority", .group = 1 },
815
{ .name = NULL }
816
};
817
818
819
error_t parse_opt (int key, char *arg,
820
struct argp_state *state) {
821
/* Get the INPUT argument from `argp_parse', which we know is
822
a pointer to our plugin list pointer. */
823
switch (key) {
824
case 128:
825
debug = true;
826
break;
827
case 'c':
828
connect_to = arg;
829
break;
830
case 'i':
831
interface = arg;
832
break;
833
case 'd':
834
keydir = arg;
835
break;
836
case 's':
837
seckeyfile = arg;
838
break;
839
case 'p':
840
pubkeyfile = arg;
841
break;
842
case 129:
843
errno = 0;
844
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
845
if (errno){
846
perror("strtol");
847
exit(EXIT_FAILURE);
848
}
849
break;
850
case 130:
851
mc.priority = arg;
852
break;
853
case ARGP_KEY_ARG:
854
argp_usage (state);
855
break;
856
case ARGP_KEY_END:
857
break;
858
default:
859
return ARGP_ERR_UNKNOWN;
860
}
861
return 0;
862
}
863
864
struct argp argp = { .options = options, .parser = parse_opt,
865
.args_doc = "",
866
.doc = "Mandos client -- Get and decrypt"
867
" passwords from mandos server" };
868
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
869
if (ret == ARGP_ERR_UNKNOWN){
870
fprintf(stderr, "Unkown error while parsing arguments\n");
871
exitcode = EXIT_FAILURE;
872
goto end;
873
}
874
}
875
876
pubkeyfile = combinepath(keydir, pubkeyfile);
877
if (pubkeyfile == NULL){
878
perror("combinepath");
879
exitcode = EXIT_FAILURE;
880
goto end;
881
}
882
883
seckeyfile = combinepath(keydir, seckeyfile);
884
if (seckeyfile == NULL){
885
perror("combinepath");
886
goto end;
887
}
888
889
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
890
if (ret == -1){
891
fprintf(stderr, "init_gnutls_global\n");
892
goto end;
1380
893
} else {
1381
if (debug){
1382
fprintf_plus(stderr, "Check current_server if we should run"
1383
" it, or wait\n");
1384
}
1385
/* the current time */
1386
ret = clock_gettime(CLOCK_MONOTONIC, &now);
894
gnutls_initalized = true;
895
}
896
897
uid = getuid();
898
gid = getgid();
899
900
ret = setuid(uid);
901
if (ret == -1){
902
perror("setuid");
903
}
904
905
setgid(gid);
906
if (ret == -1){
907
perror("setgid");
908
}
909
910
if_index = (AvahiIfIndex) if_nametoindex(interface);
911
if(if_index == 0){
912
fprintf(stderr, "No such interface: \"%s\"\n", interface);
913
exit(EXIT_FAILURE);
914
}
915
916
if(connect_to != NULL){
917
/* Connect directly, do not use Zeroconf */
918
/* (Mainly meant for debugging) */
919
char *address = strrchr(connect_to, ':');
920
if(address == NULL){
921
fprintf(stderr, "No colon in address\n");
922
exitcode = EXIT_FAILURE;
923
goto end;
924
}
925
errno = 0;
926
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
927
if(errno){
928
perror("Bad port number");
929
exitcode = EXIT_FAILURE;
930
goto end;
931
}
932
*address = '\0';
933
address = connect_to;
934
ret = start_mandos_communication(address, port, if_index, &mc);
935
if(ret < 0){
936
exitcode = EXIT_FAILURE;
937
} else {
938
exitcode = EXIT_SUCCESS;
939
}
940
goto end;
941
}
942
943
/* If the interface is down, bring it up */
944
{
945
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
946
if(sd < 0) {
947
perror("socket");
948
exitcode = EXIT_FAILURE;
949
goto end;
950
}
951
strcpy(network.ifr_name, interface); /* Spurious warning */
952
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1387
953
if(ret == -1){
1388
perror_plus("clock_gettime");
1389
return -1;
1390
}
1391
/* Calculating in ms how long time between now and server
1392
who we visted longest time ago. Now - last seen. */
1393
waited_time.tv_sec = (now.tv_sec
1394
- mc->current_server->last_seen.tv_sec);
1395
waited_time.tv_nsec = (now.tv_nsec
1396
- mc->current_server->last_seen.tv_nsec);
1397
/* total time is 10s/10,000ms.
1398
Converting to s from ms by dividing by 1,000,
1399
and ns to ms by dividing by 1,000,000. */
1400
block_time = ((retry_interval
1401
- ((intmax_t)waited_time.tv_sec * 1000))
1402
- ((intmax_t)waited_time.tv_nsec / 1000000));
1403
1404
if (debug){
1405
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1406
block_time);
1407
}
1408
1409
if(block_time <= 0){
1410
ret = start_mandos_communication(mc->current_server->ip,
1411
mc->current_server->port,
1412
mc->current_server->if_index,
1413
mc->current_server->af, mc);
1414
if(ret == 0){
1415
avahi_simple_poll_quit(s);
1416
return 0;
1417
}
1418
ret = clock_gettime(CLOCK_MONOTONIC,
1419
&mc->current_server->last_seen);
1420
if(ret == -1){
1421
perror_plus("clock_gettime");
1422
return -1;
1423
}
1424
mc->current_server = mc->current_server->next;
1425
block_time = 0; /* Call avahi to find new Mandos
1426
servers, but don't block */
1427
}
1428
1429
ret = avahi_simple_poll_iterate(s, (int)block_time);
1430
}
1431
if(ret != 0){
1432
if (ret > 0 or errno != EINTR){
1433
return (ret != 1) ? ret : 0;
1434
}
1435
}
1436
}
1437
}
1438
1439
/* Set effective uid to 0, return errno */
1440
error_t raise_privileges(void){
1441
error_t old_errno = errno;
1442
error_t ret_errno = 0;
1443
if(seteuid(0) == -1){
1444
ret_errno = errno;
1445
perror_plus("seteuid");
1446
}
1447
errno = old_errno;
1448
return ret_errno;
1449
}
1450
1451
/* Set effective and real user ID to 0. Return errno. */
1452
error_t raise_privileges_permanently(void){
1453
error_t old_errno = errno;
1454
error_t ret_errno = raise_privileges();
1455
if(ret_errno != 0){
1456
errno = old_errno;
1457
return ret_errno;
1458
}
1459
if(setuid(0) == -1){
1460
ret_errno = errno;
1461
perror_plus("seteuid");
1462
}
1463
errno = old_errno;
1464
return ret_errno;
1465
}
1466
1467
/* Set effective user ID to unprivileged saved user ID */
1468
error_t lower_privileges(void){
1469
error_t old_errno = errno;
1470
error_t ret_errno = 0;
1471
if(seteuid(uid) == -1){
1472
ret_errno = errno;
1473
perror_plus("seteuid");
1474
}
1475
errno = old_errno;
1476
return ret_errno;
1477
}
1478
1479
/* Lower privileges permanently */
1480
error_t lower_privileges_permanently(void){
1481
error_t old_errno = errno;
1482
error_t ret_errno = 0;
1483
if(setuid(uid) == -1){
1484
ret_errno = errno;
1485
perror_plus("setuid");
1486
}
1487
errno = old_errno;
1488
return ret_errno;
1489
}
1490
1491
bool run_network_hooks(const char *mode, const char *interface,
1492
const float delay){
1493
struct dirent **direntries;
1494
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1495
alphasort);
1496
if(numhooks == -1){
1497
if(errno == ENOENT){
1498
if(debug){
1499
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1500
" found\n", hookdir);
1501
}
1502
} else {
1503
perror_plus("scandir");
1504
}
1505
} else {
1506
struct dirent *direntry;
1507
int ret;
1508
int devnull = open("/dev/null", O_RDONLY);
1509
for(int i = 0; i < numhooks; i++){
1510
direntry = direntries[i];
1511
char *fullname = NULL;
1512
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1513
if(ret < 0){
1514
perror_plus("asprintf");
1515
continue;
1516
}
1517
if(debug){
1518
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1519
direntry->d_name);
1520
}
1521
pid_t hook_pid = fork();
1522
if(hook_pid == 0){
1523
/* Child */
1524
/* Raise privileges */
1525
raise_privileges_permanently();
1526
/* Set group */
1527
errno = 0;
1528
ret = setgid(0);
1529
if(ret == -1){
1530
perror_plus("setgid");
1531
}
1532
/* Reset supplementary groups */
1533
errno = 0;
1534
ret = setgroups(0, NULL);
1535
if(ret == -1){
1536
perror_plus("setgroups");
1537
}
1538
dup2(devnull, STDIN_FILENO);
1539
close(devnull);
1540
dup2(STDERR_FILENO, STDOUT_FILENO);
1541
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1542
if(ret == -1){
1543
perror_plus("setenv");
1544
_exit(EX_OSERR);
1545
}
1546
ret = setenv("DEVICE", interface, 1);
1547
if(ret == -1){
1548
perror_plus("setenv");
1549
_exit(EX_OSERR);
1550
}
1551
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1552
if(ret == -1){
1553
perror_plus("setenv");
1554
_exit(EX_OSERR);
1555
}
1556
ret = setenv("MODE", mode, 1);
1557
if(ret == -1){
1558
perror_plus("setenv");
1559
_exit(EX_OSERR);
1560
}
1561
char *delaystring;
1562
ret = asprintf(&delaystring, "%f", delay);
1563
if(ret == -1){
1564
perror_plus("asprintf");
1565
_exit(EX_OSERR);
1566
}
1567
ret = setenv("DELAY", delaystring, 1);
1568
if(ret == -1){
1569
free(delaystring);
1570
perror_plus("setenv");
1571
_exit(EX_OSERR);
1572
}
1573
free(delaystring);
1574
if(connect_to != NULL){
1575
ret = setenv("CONNECT", connect_to, 1);
1576
if(ret == -1){
1577
perror_plus("setenv");
1578
_exit(EX_OSERR);
1579
}
1580
}
1581
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1582
perror_plus("execl");
1583
_exit(EXIT_FAILURE);
1584
}
1585
} else {
1586
int status;
1587
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1588
perror_plus("waitpid");
1589
free(fullname);
1590
continue;
1591
}
1592
if(WIFEXITED(status)){
1593
if(WEXITSTATUS(status) != 0){
1594
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1595
" with status %d\n", direntry->d_name,
1596
WEXITSTATUS(status));
1597
free(fullname);
1598
continue;
1599
}
1600
} else if(WIFSIGNALED(status)){
1601
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1602
" signal %d\n", direntry->d_name,
1603
WTERMSIG(status));
1604
free(fullname);
1605
continue;
1606
} else {
1607
fprintf_plus(stderr, "Warning: network hook \"%s\""
1608
" crashed\n", direntry->d_name);
1609
free(fullname);
1610
continue;
1611
}
1612
}
1613
free(fullname);
1614
if(debug){
1615
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1616
direntry->d_name);
1617
}
1618
}
1619
close(devnull);
1620
}
1621
return true;
1622
}
1623
1624
error_t bring_up_interface(const char *const interface,
1625
const float delay){
1626
int sd = -1;
1627
error_t old_errno = errno;
1628
error_t ret_errno = 0;
1629
int ret, ret_setflags;
1630
struct ifreq network;
1631
unsigned int if_index = if_nametoindex(interface);
1632
if(if_index == 0){
1633
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1634
errno = old_errno;
1635
return ENXIO;
1636
}
1637
1638
if(quit_now){
1639
errno = old_errno;
1640
return EINTR;
1641
}
1642
1643
if(not interface_is_up(interface)){
1644
if(not get_flags(interface, &network) and debug){
1645
ret_errno = errno;
1646
fprintf_plus(stderr, "Failed to get flags for interface "
1647
"\"%s\"\n", interface);
1648
return ret_errno;
1649
}
1650
network.ifr_flags |= IFF_UP;
1651
1652
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1653
if(sd < 0){
1654
ret_errno = errno;
1655
perror_plus("socket");
1656
errno = old_errno;
1657
return ret_errno;
1658
}
1659
1660
if(quit_now){
954
perror("ioctl SIOCGIFFLAGS");
955
exitcode = EXIT_FAILURE;
956
goto end;
957
}
958
if((network.ifr_flags & IFF_UP) == 0){
959
network.ifr_flags |= IFF_UP;
960
ret = ioctl(sd, SIOCSIFFLAGS, &network);
961
if(ret == -1){
962
perror("ioctl SIOCSIFFLAGS");
963
exitcode = EXIT_FAILURE;
964
goto end;
965
}
966
}
1661
967
close(sd);
1662
errno = old_errno;
1663
return EINTR;
1664
}
1665
1666
if(debug){
1667
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1668
interface);
1669
}
1670
1671
/* Raise priviliges */
1672
raise_privileges();
1673
1674
#ifdef __linux__
1675
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1676
messages about the network interface to mess up the prompt */
1677
int ret_linux = klogctl(8, NULL, 5);
1678
bool restore_loglevel = true;
1679
if(ret_linux == -1){
1680
restore_loglevel = false;
1681
perror_plus("klogctl");
1682
}
1683
#endif /* __linux__ */
1684
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1685
ret_errno = errno;
1686
#ifdef __linux__
1687
if(restore_loglevel){
1688
ret_linux = klogctl(7, NULL, 0);
1689
if(ret_linux == -1){
1690
perror_plus("klogctl");
1691
}
1692
}
1693
#endif /* __linux__ */
1694
1695
/* Lower privileges */
1696
lower_privileges();
1697
1698
/* Close the socket */
1699
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1700
if(ret == -1){
1701
perror_plus("close");
1702
}
1703
1704
if(ret_setflags == -1){
1705
errno = ret_errno;
1706
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1707
errno = old_errno;
1708
return ret_errno;
1709
}
1710
} else if(debug){
1711
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1712
interface);
1713
}
1714
1715
/* Sleep checking until interface is running.
1716
Check every 0.25s, up to total time of delay */
1717
for(int i=0; i < delay * 4; i++){
1718
if(interface_is_running(interface)){
1719
break;
1720
}
1721
struct timespec sleeptime = { .tv_nsec = 250000000 };
1722
ret = nanosleep(&sleeptime, NULL);
1723
if(ret == -1 and errno != EINTR){
1724
perror_plus("nanosleep");
1725
}
1726
}
1727
1728
errno = old_errno;
1729
return 0;
1730
}
1731
1732
error_t take_down_interface(const char *const interface){
1733
error_t old_errno = errno;
1734
struct ifreq network;
1735
unsigned int if_index = if_nametoindex(interface);
1736
if(if_index == 0){
1737
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1738
errno = old_errno;
1739
return ENXIO;
1740
}
1741
if(interface_is_up(interface)){
1742
error_t ret_errno = 0;
1743
if(not get_flags(interface, &network) and debug){
1744
ret_errno = errno;
1745
fprintf_plus(stderr, "Failed to get flags for interface "
1746
"\"%s\"\n", interface);
1747
return ret_errno;
1748
}
1749
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1750
1751
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1752
if(sd < 0){
1753
ret_errno = errno;
1754
perror_plus("socket");
1755
errno = old_errno;
1756
return ret_errno;
1757
}
1758
1759
if(debug){
1760
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1761
interface);
1762
}
1763
1764
/* Raise priviliges */
1765
raise_privileges();
1766
1767
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1768
ret_errno = errno;
1769
1770
/* Lower privileges */
1771
lower_privileges();
1772
1773
/* Close the socket */
1774
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1775
if(ret == -1){
1776
perror_plus("close");
1777
}
1778
1779
if(ret_setflags == -1){
1780
errno = ret_errno;
1781
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1782
errno = old_errno;
1783
return ret_errno;
1784
}
1785
} else if(debug){
1786
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1787
interface);
1788
}
1789
1790
errno = old_errno;
1791
return 0;
1792
}
1793
1794
int main(int argc, char *argv[]){
1795
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1796
.priority = "SECURE256:!CTYPE-X.509:"
1797
"+CTYPE-OPENPGP", .current_server = NULL,
1798
.interfaces = NULL, .interfaces_size = 0 };
1799
AvahiSServiceBrowser *sb = NULL;
1800
error_t ret_errno;
1801
int ret;
1802
intmax_t tmpmax;
1803
char *tmp;
1804
int exitcode = EXIT_SUCCESS;
1805
char *interfaces_to_take_down = NULL;
1806
size_t interfaces_to_take_down_size = 0;
1807
char tempdir[] = "/tmp/mandosXXXXXX";
1808
bool tempdir_created = false;
1809
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1810
const char *seckey = PATHDIR "/" SECKEY;
1811
const char *pubkey = PATHDIR "/" PUBKEY;
1812
char *interfaces_hooks = NULL;
1813
1814
bool gnutls_initialized = false;
1815
bool gpgme_initialized = false;
1816
float delay = 2.5f;
1817
double retry_interval = 10; /* 10s between trying a server and
1818
retrying the same server again */
1819
1820
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1821
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1822
1823
uid = getuid();
1824
gid = getgid();
1825
1826
/* Lower any group privileges we might have, just to be safe */
1827
errno = 0;
1828
ret = setgid(gid);
1829
if(ret == -1){
1830
perror_plus("setgid");
1831
}
1832
1833
/* Lower user privileges (temporarily) */
1834
errno = 0;
1835
ret = seteuid(uid);
1836
if(ret == -1){
1837
perror_plus("seteuid");
1838
}
1839
1840
if(quit_now){
1841
goto end;
1842
}
1843
1844
{
1845
struct argp_option options[] = {
1846
{ .name = "debug", .key = 128,
1847
.doc = "Debug mode", .group = 3 },
1848
{ .name = "connect", .key = 'c',
1849
.arg = "ADDRESS:PORT",
1850
.doc = "Connect directly to a specific Mandos server",
1851
.group = 1 },
1852
{ .name = "interface", .key = 'i',
1853
.arg = "NAME",
1854
.doc = "Network interface that will be used to search for"
1855
" Mandos servers",
1856
.group = 1 },
1857
{ .name = "seckey", .key = 's',
1858
.arg = "FILE",
1859
.doc = "OpenPGP secret key file base name",
1860
.group = 1 },
1861
{ .name = "pubkey", .key = 'p',
1862
.arg = "FILE",
1863
.doc = "OpenPGP public key file base name",
1864
.group = 2 },
1865
{ .name = "dh-bits", .key = 129,
1866
.arg = "BITS",
1867
.doc = "Bit length of the prime number used in the"
1868
" Diffie-Hellman key exchange",
1869
.group = 2 },
1870
{ .name = "priority", .key = 130,
1871
.arg = "STRING",
1872
.doc = "GnuTLS priority string for the TLS handshake",
1873
.group = 1 },
1874
{ .name = "delay", .key = 131,
1875
.arg = "SECONDS",
1876
.doc = "Maximum delay to wait for interface startup",
1877
.group = 2 },
1878
{ .name = "retry", .key = 132,
1879
.arg = "SECONDS",
1880
.doc = "Retry interval used when denied by the Mandos server",
1881
.group = 2 },
1882
{ .name = "network-hook-dir", .key = 133,
1883
.arg = "DIR",
1884
.doc = "Directory where network hooks are located",
1885
.group = 2 },
1886
/*
1887
* These reproduce what we would get without ARGP_NO_HELP
1888
*/
1889
{ .name = "help", .key = '?',
1890
.doc = "Give this help list", .group = -1 },
1891
{ .name = "usage", .key = -3,
1892
.doc = "Give a short usage message", .group = -1 },
1893
{ .name = "version", .key = 'V',
1894
.doc = "Print program version", .group = -1 },
1895
{ .name = NULL }
1896
};
1897
1898
error_t parse_opt(int key, char *arg,
1899
struct argp_state *state){
1900
errno = 0;
1901
switch(key){
1902
case 128: /* --debug */
1903
debug = true;
1904
break;
1905
case 'c': /* --connect */
1906
connect_to = arg;
1907
break;
1908
case 'i': /* --interface */
1909
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1910
arg, (int)',');
1911
if(ret_errno != 0){
1912
argp_error(state, "%s", strerror(ret_errno));
1913
}
1914
break;
1915
case 's': /* --seckey */
1916
seckey = arg;
1917
break;
1918
case 'p': /* --pubkey */
1919
pubkey = arg;
1920
break;
1921
case 129: /* --dh-bits */
1922
errno = 0;
1923
tmpmax = strtoimax(arg, &tmp, 10);
1924
if(errno != 0 or tmp == arg or *tmp != '\0'
1925
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1926
argp_error(state, "Bad number of DH bits");
1927
}
1928
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1929
break;
1930
case 130: /* --priority */
1931
mc.priority = arg;
1932
break;
1933
case 131: /* --delay */
1934
errno = 0;
1935
delay = strtof(arg, &tmp);
1936
if(errno != 0 or tmp == arg or *tmp != '\0'){
1937
argp_error(state, "Bad delay");
1938
}
1939
case 132: /* --retry */
1940
errno = 0;
1941
retry_interval = strtod(arg, &tmp);
1942
if(errno != 0 or tmp == arg or *tmp != '\0'
1943
or (retry_interval * 1000) > INT_MAX
1944
or retry_interval < 0){
1945
argp_error(state, "Bad retry interval");
1946
}
1947
break;
1948
case 133: /* --network-hook-dir */
1949
hookdir = arg;
1950
break;
1951
/*
1952
* These reproduce what we would get without ARGP_NO_HELP
1953
*/
1954
case '?': /* --help */
1955
argp_state_help(state, state->out_stream,
1956
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1957
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1958
case -3: /* --usage */
1959
argp_state_help(state, state->out_stream,
1960
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1961
case 'V': /* --version */
1962
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1963
exit(argp_err_exit_status);
1964
break;
1965
default:
1966
return ARGP_ERR_UNKNOWN;
1967
}
1968
return errno;
1969
}
1970
1971
struct argp argp = { .options = options, .parser = parse_opt,
1972
.args_doc = "",
1973
.doc = "Mandos client -- Get and decrypt"
1974
" passwords from a Mandos server" };
1975
ret = argp_parse(&argp, argc, argv,
1976
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1977
switch(ret){
1978
case 0:
1979
break;
1980
case ENOMEM:
1981
default:
1982
errno = ret;
1983
perror_plus("argp_parse");
1984
exitcode = EX_OSERR;
1985
goto end;
1986
case EINVAL:
1987
exitcode = EX_USAGE;
1988
goto end;
1989
}
1990
}
1991
1992
{
1993
/* Work around Debian bug #633582:
1994
<http://bugs.debian.org/633582> */
1995
1996
/* Re-raise priviliges */
1997
if(raise_privileges() == 0){
1998
struct stat st;
1999
2000
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2001
int seckey_fd = open(seckey, O_RDONLY);
2002
if(seckey_fd == -1){
2003
perror_plus("open");
2004
} else {
2005
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2006
if(ret == -1){
2007
perror_plus("fstat");
2008
} else {
2009
if(S_ISREG(st.st_mode)
2010
and st.st_uid == 0 and st.st_gid == 0){
2011
ret = fchown(seckey_fd, uid, gid);
2012
if(ret == -1){
2013
perror_plus("fchown");
2014
}
2015
}
2016
}
2017
TEMP_FAILURE_RETRY(close(seckey_fd));
2018
}
2019
}
2020
2021
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2022
int pubkey_fd = open(pubkey, O_RDONLY);
2023
if(pubkey_fd == -1){
2024
perror_plus("open");
2025
} else {
2026
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2027
if(ret == -1){
2028
perror_plus("fstat");
2029
} else {
2030
if(S_ISREG(st.st_mode)
2031
and st.st_uid == 0 and st.st_gid == 0){
2032
ret = fchown(pubkey_fd, uid, gid);
2033
if(ret == -1){
2034
perror_plus("fchown");
2035
}
2036
}
2037
}
2038
TEMP_FAILURE_RETRY(close(pubkey_fd));
2039
}
2040
}
2041
2042
/* Lower privileges */
2043
lower_privileges();
2044
}
2045
}
2046
2047
/* Remove invalid interface names (except "none") */
2048
{
2049
char *interface = NULL;
2050
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2051
interface))){
2052
if(strcmp(interface, "none") != 0
2053
and if_nametoindex(interface) == 0){
2054
if(interface[0] != '\0'){
2055
fprintf_plus(stderr, "Not using nonexisting interface"
2056
" \"%s\"\n", interface);
2057
}
2058
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2059
interface = NULL;
2060
}
2061
}
2062
}
2063
2064
/* Run network hooks */
2065
{
2066
if(mc.interfaces != NULL){
2067
interfaces_hooks = malloc(mc.interfaces_size);
2068
if(interfaces_hooks == NULL){
2069
perror_plus("malloc");
2070
goto end;
2071
}
2072
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2073
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2074
}
2075
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2076
interfaces_hooks : "", delay)){
2077
goto end;
2078
}
2079
}
2080
2081
if(not debug){
2082
avahi_set_log_function(empty_log);
2083
}
2084
2085
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2086
from the signal handler */
2087
/* Initialize the pseudo-RNG for Avahi */
2088
srand((unsigned int) time(NULL));
2089
simple_poll = avahi_simple_poll_new();
2090
if(simple_poll == NULL){
2091
fprintf_plus(stderr,
2092
"Avahi: Failed to create simple poll object.\n");
2093
exitcode = EX_UNAVAILABLE;
2094
goto end;
2095
}
2096
2097
sigemptyset(&sigterm_action.sa_mask);
2098
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2099
if(ret == -1){
2100
perror_plus("sigaddset");
2101
exitcode = EX_OSERR;
2102
goto end;
2103
}
2104
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2105
if(ret == -1){
2106
perror_plus("sigaddset");
2107
exitcode = EX_OSERR;
2108
goto end;
2109
}
2110
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2111
if(ret == -1){
2112
perror_plus("sigaddset");
2113
exitcode = EX_OSERR;
2114
goto end;
2115
}
2116
/* Need to check if the handler is SIG_IGN before handling:
2117
| [[info:libc:Initial Signal Actions]] |
2118
| [[info:libc:Basic Signal Handling]] |
2119
*/
2120
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2121
if(ret == -1){
2122
perror_plus("sigaction");
2123
return EX_OSERR;
2124
}
2125
if(old_sigterm_action.sa_handler != SIG_IGN){
2126
ret = sigaction(SIGINT, &sigterm_action, NULL);
2127
if(ret == -1){
2128
perror_plus("sigaction");
2129
exitcode = EX_OSERR;
2130
goto end;
2131
}
2132
}
2133
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2134
if(ret == -1){
2135
perror_plus("sigaction");
2136
return EX_OSERR;
2137
}
2138
if(old_sigterm_action.sa_handler != SIG_IGN){
2139
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2140
if(ret == -1){
2141
perror_plus("sigaction");
2142
exitcode = EX_OSERR;
2143
goto end;
2144
}
2145
}
2146
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2147
if(ret == -1){
2148
perror_plus("sigaction");
2149
return EX_OSERR;
2150
}
2151
if(old_sigterm_action.sa_handler != SIG_IGN){
2152
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2153
if(ret == -1){
2154
perror_plus("sigaction");
2155
exitcode = EX_OSERR;
2156
goto end;
2157
}
2158
}
2159
2160
/* If no interfaces were specified, make a list */
2161
if(mc.interfaces == NULL){
2162
struct dirent **direntries;
2163
/* Look for any good interfaces */
2164
ret = scandir(sys_class_net, &direntries, good_interface,
2165
alphasort);
2166
if(ret >= 1){
2167
/* Add all found interfaces to interfaces list */
2168
for(int i = 0; i < ret; ++i){
2169
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2170
direntries[i]->d_name);
2171
if(ret_errno != 0){
2172
errno = ret_errno;
2173
perror_plus("argz_add");
2174
continue;
2175
}
2176
if(debug){
2177
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2178
direntries[i]->d_name);
2179
}
2180
}
2181
free(direntries);
2182
} else {
2183
free(direntries);
2184
fprintf_plus(stderr, "Could not find a network interface\n");
2185
exitcode = EXIT_FAILURE;
2186
goto end;
2187
}
2188
}
2189
2190
/* Bring up interfaces which are down, and remove any "none"s */
2191
{
2192
char *interface = NULL;
2193
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2194
interface))){
2195
/* If interface name is "none", stop bringing up interfaces.
2196
Also remove all instances of "none" from the list */
2197
if(strcmp(interface, "none") == 0){
2198
argz_delete(&mc.interfaces, &mc.interfaces_size,
2199
interface);
2200
interface = NULL;
2201
while((interface = argz_next(mc.interfaces,
2202
mc.interfaces_size, interface))){
2203
if(strcmp(interface, "none") == 0){
2204
argz_delete(&mc.interfaces, &mc.interfaces_size,
2205
interface);
2206
interface = NULL;
2207
}
2208
}
2209
break;
2210
}
2211
bool interface_was_up = interface_is_up(interface);
2212
ret = bring_up_interface(interface, delay);
2213
if(not interface_was_up){
2214
if(ret != 0){
2215
errno = ret;
2216
perror_plus("Failed to bring up interface");
2217
} else {
2218
ret_errno = argz_add(&interfaces_to_take_down,
2219
&interfaces_to_take_down_size,
2220
interface);
2221
if(ret_errno != 0){
2222
errno = ret_errno;
2223
perror_plus("argz_add");
2224
}
2225
}
2226
}
2227
}
2228
if(debug and (interfaces_to_take_down == NULL)){
2229
fprintf_plus(stderr, "No interfaces were brought up\n");
2230
}
2231
}
2232
2233
/* If we only got one interface, explicitly use only that one */
2234
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2235
if(debug){
2236
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2237
mc.interfaces);
2238
}
2239
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2240
}
2241
2242
if(quit_now){
2243
goto end;
2244
}
2245
2246
ret = init_gnutls_global(pubkey, seckey, &mc);
2247
if(ret == -1){
2248
fprintf_plus(stderr, "init_gnutls_global failed\n");
2249
exitcode = EX_UNAVAILABLE;
2250
goto end;
2251
} else {
2252
gnutls_initialized = true;
2253
}
2254
2255
if(quit_now){
2256
goto end;
2257
}
2258
2259
if(mkdtemp(tempdir) == NULL){
2260
perror_plus("mkdtemp");
2261
goto end;
2262
}
2263
tempdir_created = true;
2264
2265
if(quit_now){
2266
goto end;
2267
}
2268
2269
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2270
fprintf_plus(stderr, "init_gpgme failed\n");
2271
exitcode = EX_UNAVAILABLE;
2272
goto end;
2273
} else {
2274
gpgme_initialized = true;
2275
}
2276
2277
if(quit_now){
2278
goto end;
2279
}
2280
2281
if(connect_to != NULL){
2282
/* Connect directly, do not use Zeroconf */
2283
/* (Mainly meant for debugging) */
2284
char *address = strrchr(connect_to, ':');
2285
2286
if(address == NULL){
2287
fprintf_plus(stderr, "No colon in address\n");
2288
exitcode = EX_USAGE;
2289
goto end;
2290
}
2291
2292
if(quit_now){
2293
goto end;
2294
}
2295
2296
in_port_t port;
2297
errno = 0;
2298
tmpmax = strtoimax(address+1, &tmp, 10);
2299
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2300
or tmpmax != (in_port_t)tmpmax){
2301
fprintf_plus(stderr, "Bad port number\n");
2302
exitcode = EX_USAGE;
2303
goto end;
2304
}
2305
2306
if(quit_now){
2307
goto end;
2308
}
2309
2310
port = (in_port_t)tmpmax;
2311
*address = '\0';
2312
/* Colon in address indicates IPv6 */
2313
int af;
2314
if(strchr(connect_to, ':') != NULL){
2315
af = AF_INET6;
2316
/* Accept [] around IPv6 address - see RFC 5952 */
2317
if(connect_to[0] == '[' and address[-1] == ']')
2318
{
2319
connect_to++;
2320
address[-1] = '\0';
2321
}
2322
} else {
2323
af = AF_INET;
2324
}
2325
address = connect_to;
2326
2327
if(quit_now){
2328
goto end;
2329
}
2330
2331
while(not quit_now){
2332
ret = start_mandos_communication(address, port, if_index, af,
2333
&mc);
2334
if(quit_now or ret == 0){
2335
break;
2336
}
2337
if(debug){
2338
fprintf_plus(stderr, "Retrying in %d seconds\n",
2339
(int)retry_interval);
2340
}
2341
sleep((unsigned int)retry_interval);
2342
}
2343
2344
if (not quit_now){
2345
exitcode = EXIT_SUCCESS;
2346
}
2347
2348
goto end;
2349
}
2350
2351
if(quit_now){
2352
goto end;
2353
}
2354
2355
{
2356
AvahiServerConfig config;
2357
/* Do not publish any local Zeroconf records */
2358
avahi_server_config_init(&config);
2359
config.publish_hinfo = 0;
2360
config.publish_addresses = 0;
2361
config.publish_workstation = 0;
2362
config.publish_domain = 0;
2363
2364
/* Allocate a new server */
2365
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2366
&config, NULL, NULL, &ret_errno);
2367
2368
/* Free the Avahi configuration data */
2369
avahi_server_config_free(&config);
2370
}
2371
2372
/* Check if creating the Avahi server object succeeded */
2373
if(mc.server == NULL){
2374
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2375
avahi_strerror(ret_errno));
2376
exitcode = EX_UNAVAILABLE;
2377
goto end;
2378
}
2379
2380
if(quit_now){
2381
goto end;
2382
}
2383
2384
/* Create the Avahi service browser */
2385
sb = avahi_s_service_browser_new(mc.server, if_index,
2386
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2387
NULL, 0, browse_callback,
2388
(void *)&mc);
2389
if(sb == NULL){
2390
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2391
avahi_strerror(avahi_server_errno(mc.server)));
2392
exitcode = EX_UNAVAILABLE;
2393
goto end;
2394
}
2395
2396
if(quit_now){
2397
goto end;
2398
}
2399
2400
/* Run the main loop */
2401
2402
if(debug){
2403
fprintf_plus(stderr, "Starting Avahi loop search\n");
2404
}
2405
2406
ret = avahi_loop_with_timeout(simple_poll,
2407
(int)(retry_interval * 1000), &mc);
2408
if(debug){
2409
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2410
(ret == 0) ? "successfully" : "with error");
2411
}
2412
968
}
969
970
if (not debug){
971
avahi_set_log_function(empty_log);
972
}
973
974
/* Initialize the pseudo-RNG for Avahi */
975
srand((unsigned int) time(NULL));
976
977
/* Allocate main Avahi loop object */
978
mc.simple_poll = avahi_simple_poll_new();
979
if (mc.simple_poll == NULL) {
980
fprintf(stderr, "Avahi: Failed to create simple poll"
981
" object.\n");
982
exitcode = EXIT_FAILURE;
983
goto end;
984
}
985
986
{
987
AvahiServerConfig config;
988
/* Do not publish any local Zeroconf records */
989
avahi_server_config_init(&config);
990
config.publish_hinfo = 0;
991
config.publish_addresses = 0;
992
config.publish_workstation = 0;
993
config.publish_domain = 0;
994
995
/* Allocate a new server */
996
mc.server = avahi_server_new(avahi_simple_poll_get
997
(mc.simple_poll), &config, NULL,
998
NULL, &error);
999
1000
/* Free the Avahi configuration data */
1001
avahi_server_config_free(&config);
1002
}
1003
1004
/* Check if creating the Avahi server object succeeded */
1005
if (mc.server == NULL) {
1006
fprintf(stderr, "Failed to create Avahi server: %s\n",
1007
avahi_strerror(error));
1008
exitcode = EXIT_FAILURE;
1009
goto end;
1010
}
1011
1012
/* Create the Avahi service browser */
1013
sb = avahi_s_service_browser_new(mc.server, if_index,
1014
AVAHI_PROTO_INET6,
1015
"_mandos._tcp", NULL, 0,
1016
browse_callback, &mc);
1017
if (sb == NULL) {
1018
fprintf(stderr, "Failed to create service browser: %s\n",
1019
avahi_strerror(avahi_server_errno(mc.server)));
1020
exitcode = EXIT_FAILURE;
1021
goto end;
1022
}
1023
1024
/* Run the main loop */
1025
1026
if (debug){
1027
fprintf(stderr, "Starting Avahi loop search\n");
1028
}
1029
1030
avahi_simple_poll_loop(mc.simple_poll);
1031
2413
1032
end:
2414
2415
if(debug){
2416
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2417
}
2418
2419
/* Cleanup things */
2420
free(mc.interfaces);
2421
2422
if(sb != NULL)
2423
avahi_s_service_browser_free(sb);
2424
2425
if(mc.server != NULL)
2426
avahi_server_free(mc.server);
2427
2428
if(simple_poll != NULL)
2429
avahi_simple_poll_free(simple_poll);
2430
2431
if(gnutls_initialized){
2432
gnutls_certificate_free_credentials(mc.cred);
2433
gnutls_global_deinit();
2434
gnutls_dh_params_deinit(mc.dh_params);
2435
}
2436
2437
if(gpgme_initialized){
2438
gpgme_release(mc.ctx);
2439
}
2440
2441
/* Cleans up the circular linked list of Mandos servers the client
2442
has seen */
2443
if(mc.current_server != NULL){
2444
mc.current_server->prev->next = NULL;
2445
while(mc.current_server != NULL){
2446
server *next = mc.current_server->next;
2447
free(mc.current_server);
2448
mc.current_server = next;
2449
}
2450
}
2451
2452
/* Re-raise priviliges */
2453
{
2454
raise_privileges();
2455
2456
/* Run network hooks */
2457
run_network_hooks("stop", interfaces_hooks != NULL ?
2458
interfaces_hooks : "", delay);
2459
2460
/* Take down the network interfaces which were brought up */
2461
{
2462
char *interface = NULL;
2463
while((interface=argz_next(interfaces_to_take_down,
2464
interfaces_to_take_down_size,
2465
interface))){
2466
ret_errno = take_down_interface(interface);
2467
if(ret_errno != 0){
2468
errno = ret_errno;
2469
perror_plus("Failed to take down interface");
2470
}
2471
}
2472
if(debug and (interfaces_to_take_down == NULL)){
2473
fprintf_plus(stderr, "No interfaces needed to be taken"
2474
" down\n");
2475
}
2476
}
2477
2478
lower_privileges_permanently();
2479
}
2480
2481
free(interfaces_to_take_down);
2482
free(interfaces_hooks);
2483
2484
/* Removes the GPGME temp directory and all files inside */
2485
if(tempdir_created){
2486
struct dirent **direntries = NULL;
2487
struct dirent *direntry = NULL;
2488
int numentries = scandir(tempdir, &direntries, notdotentries,
2489
alphasort);
2490
if (numentries > 0){
2491
for(int i = 0; i < numentries; i++){
2492
direntry = direntries[i];
2493
char *fullname = NULL;
2494
ret = asprintf(&fullname, "%s/%s", tempdir,
2495
direntry->d_name);
2496
if(ret < 0){
2497
perror_plus("asprintf");
2498
continue;
2499
}
2500
ret = remove(fullname);
2501
if(ret == -1){
2502
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2503
strerror(errno));
2504
}
2505
free(fullname);
2506
}
2507
}
2508
2509
/* need to clean even if 0 because man page doesn't specify */
2510
free(direntries);
2511
if (numentries == -1){
2512
perror_plus("scandir");
2513
}
2514
ret = rmdir(tempdir);
2515
if(ret == -1 and errno != ENOENT){
2516
perror_plus("rmdir");
2517
}
2518
}
2519
2520
if(quit_now){
2521
sigemptyset(&old_sigterm_action.sa_mask);
2522
old_sigterm_action.sa_handler = SIG_DFL;
2523
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2524
&old_sigterm_action,
2525
NULL));
2526
if(ret == -1){
2527
perror_plus("sigaction");
2528
}
2529
do {
2530
ret = raise(signal_received);
2531
} while(ret != 0 and errno == EINTR);
2532
if(ret != 0){
2533
perror_plus("raise");
2534
abort();
2535
}
2536
TEMP_FAILURE_RETRY(pause());
2537
}
2538
2539
return exitcode;
1033
1034
if (debug){
1035
fprintf(stderr, "%s exiting\n", argv[0]);
1036
}
1037
1038
/* Cleanup things */
1039
if (sb != NULL)
1040
avahi_s_service_browser_free(sb);
1041
1042
if (mc.server != NULL)
1043
avahi_server_free(mc.server);
1044
1045
if (mc.simple_poll != NULL)
1046
avahi_simple_poll_free(mc.simple_poll);
1047
free(pubkeyfile);
1048
free(seckeyfile);
1049
1050
if (gnutls_initalized){
1051
gnutls_certificate_free_credentials(mc.cred);
1052
gnutls_global_deinit ();
1053
}
1054
1055
return exitcode;
2540
1056
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0