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- Committer: Teddy Hogeborn
- Date: 2015-07-16 23:01:02 UTC
- Revision ID: teddy@recompile.se-20150716230102-62u5uwaguiufc6ac
mandos-client: Don't use memset().
* plugins.d/mandos-client.c (start_mandos_communication): Use compound
literal
struct
assignment
instead of
memset().
* plugins.d/mandos-client.c (start_mandos_communication): Use compound
literal
struct
assignment
instead of
memset().
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- debian/upstream
- network-hooks.d
- plugin-helpers
- 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 © 2008-2015 Teddy Hogeborn
13
* Copyright © 2008-2015 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
43
stdout, ferror() */
39
#include <stdint.h> /* uint16_t, uint32_t */
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 */
44
#include <string.h> /* memset(), strcmp(), strlen(),
45
strerror(), asprintf(), strcpy() */
46
#include <sys/ioctl.h> /* ioctl */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* strcmp(), strlen(), strerror(),
50
asprintf(), strcpy() */
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(), unlinkat() */
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
*/
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
strtoimax() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
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
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
79
#include <iso646.h> /* not, or, and */
67
80
#include <argp.h> /* struct argp_option, error_t, struct
68
81
argp_state, struct argp,
69
82
argp_parse(), ARGP_KEY_ARG,
70
83
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
84
#include <signal.h> /* sigemptyset(), sigaddset(),
85
sigaction(), SIGTERM, sig_atomic_t,
86
raise() */
87
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
88
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
89
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
90
WEXITSTATUS(), WTERMSIG() */
91
#include <grp.h> /* setgroups() */
92
#include <argz.h> /* argz_add_sep(), argz_next(),
93
argz_delete(), argz_append(),
94
argz_stringify(), argz_add(),
95
argz_count() */
96
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
97
EAI_SYSTEM, gai_strerror() */
98
99
#ifdef __linux__
100
#include <sys/klog.h> /* klogctl() */
101
#endif /* __linux__ */
71
102
72
103
/* Avahi */
73
104
/* All Avahi types, constants and functions
86
117
gnutls_*
87
118
init_gnutls_session(),
88
119
GNUTLS_* */
89
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
90
GNUTLS_OPENPGP_FMT_BASE64 */
120
#include <gnutls/openpgp.h>
121
/* gnutls_certificate_set_openpgp_key_file(),
122
GNUTLS_OPENPGP_FMT_BASE64 */
91
123
92
124
/* GPGME */
93
125
#include <gpgme.h> /* All GPGME types, constants and
98
130
99
131
#define BUFFER_SIZE 256
100
132
133
#define PATHDIR "/conf/conf.d/mandos"
134
#define SECKEY "seckey.txt"
135
#define PUBKEY "pubkey.txt"
136
#define HOOKDIR "/lib/mandos/network-hooks.d"
137
101
138
bool debug = false;
102
static const char *keydir = "/conf/conf.d/mandos";
103
139
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>";
140
const char *argp_program_version = "mandos-client " VERSION;
141
const char *argp_program_bug_address = "<mandos@recompile.se>";
142
static const char sys_class_net[] = "/sys/class/net";
143
char *connect_to = NULL;
144
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
146
uid_t uid = 65534;
147
gid_t gid = 65534;
148
149
/* Doubly linked list that need to be circularly linked when used */
150
typedef struct server{
151
const char *ip;
152
in_port_t port;
153
AvahiIfIndex if_index;
154
int af;
155
struct timespec last_seen;
156
struct server *next;
157
struct server *prev;
158
} server;
106
159
107
160
/* Used for passing in values through the Avahi callback functions */
108
161
typedef struct {
109
AvahiSimplePoll *simple_poll;
110
162
AvahiServer *server;
111
163
gnutls_certificate_credentials_t cred;
112
164
unsigned int dh_bits;
113
165
gnutls_dh_params_t dh_params;
114
166
const char *priority;
167
gpgme_ctx_t ctx;
168
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
115
171
} mandos_context;
116
172
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
175
176
sig_atomic_t quit_now = 0;
177
int signal_received = 0;
178
179
/* Function to use when printing errors */
180
void perror_plus(const char *print_text){
181
int e = errno;
182
fprintf(stderr, "Mandos plugin %s: ",
183
program_invocation_short_name);
184
errno = e;
185
perror(print_text);
186
}
187
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
189
int fprintf_plus(FILE *stream, const char *format, ...){
190
va_list ap;
191
va_start (ap, format);
192
193
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
194
program_invocation_short_name));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
196
}
197
117
198
/*
118
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
119
* "buffer_capacity" is how much is currently allocated,
199
* Make additional room in "buffer" for at least BUFFER_SIZE more
200
* bytes. "buffer_capacity" is how much is currently allocated,
120
201
* "buffer_length" is how much is already used.
121
202
*/
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){
203
__attribute__((nonnull, warn_unused_result))
204
size_t incbuffer(char **buffer, size_t buffer_length,
205
size_t buffer_capacity){
206
if(buffer_length + BUFFER_SIZE > buffer_capacity){
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
208
if(new_buf == NULL){
209
int old_errno = errno;
210
free(*buffer);
211
errno = old_errno;
212
*buffer = NULL;
127
213
return 0;
128
214
}
215
*buffer = new_buf;
129
216
buffer_capacity += BUFFER_SIZE;
130
217
}
131
218
return buffer_capacity;
132
219
}
133
220
221
/* Add server to set of servers to retry periodically */
222
__attribute__((nonnull, warn_unused_result))
223
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
224
int af, server **current_server){
225
int ret;
226
server *new_server = malloc(sizeof(server));
227
if(new_server == NULL){
228
perror_plus("malloc");
229
return false;
230
}
231
*new_server = (server){ .ip = strdup(ip),
232
.port = port,
233
.if_index = if_index,
234
.af = af };
235
if(new_server->ip == NULL){
236
perror_plus("strdup");
237
free(new_server);
238
return false;
239
}
240
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
241
if(ret == -1){
242
perror_plus("clock_gettime");
243
#ifdef __GNUC__
244
#pragma GCC diagnostic push
245
#pragma GCC diagnostic ignored "-Wcast-qual"
246
#endif
247
free((char *)(new_server->ip));
248
#ifdef __GNUC__
249
#pragma GCC diagnostic pop
250
#endif
251
free(new_server);
252
return false;
253
}
254
/* Special case of first server */
255
if(*current_server == NULL){
256
new_server->next = new_server;
257
new_server->prev = new_server;
258
*current_server = new_server;
259
} else {
260
/* Place the new server last in the list */
261
new_server->next = *current_server;
262
new_server->prev = (*current_server)->prev;
263
new_server->prev->next = new_server;
264
(*current_server)->prev = new_server;
265
}
266
return true;
267
}
268
134
269
/*
135
* Decrypt OpenPGP data using keyrings in HOMEDIR.
136
* Returns -1 on error
270
* Initialize GPGME.
137
271
*/
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;
272
__attribute__((nonnull, warn_unused_result))
273
static bool init_gpgme(const char * const seckey,
274
const char * const pubkey,
275
const char * const tempdir,
276
mandos_context *mc){
144
277
gpgme_error_t rc;
145
ssize_t ret;
146
size_t plaintext_capacity = 0;
147
ssize_t plaintext_length = 0;
148
278
gpgme_engine_info_t engine_info;
149
279
150
if (debug){
151
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
280
/*
281
* Helper function to insert pub and seckey to the engine keyring.
282
*/
283
bool import_key(const char * const filename){
284
int ret;
285
int fd;
286
gpgme_data_t pgp_data;
287
288
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
289
if(fd == -1){
290
perror_plus("open");
291
return false;
292
}
293
294
rc = gpgme_data_new_from_fd(&pgp_data, fd);
295
if(rc != GPG_ERR_NO_ERROR){
296
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
297
gpgme_strsource(rc), gpgme_strerror(rc));
298
return false;
299
}
300
301
rc = gpgme_op_import(mc->ctx, pgp_data);
302
if(rc != GPG_ERR_NO_ERROR){
303
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
304
gpgme_strsource(rc), gpgme_strerror(rc));
305
return false;
306
}
307
308
ret = (int)TEMP_FAILURE_RETRY(close(fd));
309
if(ret == -1){
310
perror_plus("close");
311
}
312
gpgme_data_release(pgp_data);
313
return true;
314
}
315
316
if(debug){
317
fprintf_plus(stderr, "Initializing GPGME\n");
152
318
}
153
319
154
320
/* Init GPGME */
155
321
gpgme_check_version(NULL);
156
322
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;
323
if(rc != GPG_ERR_NO_ERROR){
324
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
325
gpgme_strsource(rc), gpgme_strerror(rc));
326
return false;
161
327
}
162
328
163
329
/* 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;
330
rc = gpgme_get_engine_info(&engine_info);
331
if(rc != GPG_ERR_NO_ERROR){
332
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
333
gpgme_strsource(rc), gpgme_strerror(rc));
334
return false;
169
335
}
170
336
while(engine_info != NULL){
171
337
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
172
338
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
173
engine_info->file_name, homedir);
339
engine_info->file_name, tempdir);
174
340
break;
175
341
}
176
342
engine_info = engine_info->next;
177
343
}
178
344
if(engine_info == NULL){
179
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
180
return -1;
345
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
346
tempdir);
347
return false;
348
}
349
350
/* Create new GPGME "context" */
351
rc = gpgme_new(&(mc->ctx));
352
if(rc != GPG_ERR_NO_ERROR){
353
fprintf_plus(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
355
gpgme_strerror(rc));
356
return false;
357
}
358
359
if(not import_key(pubkey) or not import_key(seckey)){
360
return false;
361
}
362
363
return true;
364
}
365
366
/*
367
* Decrypt OpenPGP data.
368
* Returns -1 on error
369
*/
370
__attribute__((nonnull, warn_unused_result))
371
static ssize_t pgp_packet_decrypt(const char *cryptotext,
372
size_t crypto_size,
373
char **plaintext,
374
mandos_context *mc){
375
gpgme_data_t dh_crypto, dh_plain;
376
gpgme_error_t rc;
377
ssize_t ret;
378
size_t plaintext_capacity = 0;
379
ssize_t plaintext_length = 0;
380
381
if(debug){
382
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
181
383
}
182
384
183
385
/* Create new GPGME data buffer from memory cryptotext */
184
386
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
185
387
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));
388
if(rc != GPG_ERR_NO_ERROR){
389
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
390
gpgme_strsource(rc), gpgme_strerror(rc));
189
391
return -1;
190
392
}
191
393
192
394
/* Create new empty GPGME data buffer for the plaintext */
193
395
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));
396
if(rc != GPG_ERR_NO_ERROR){
397
fprintf_plus(stderr, "Mandos plugin mandos-client: "
398
"bad gpgme_data_new: %s: %s\n",
399
gpgme_strsource(rc), gpgme_strerror(rc));
197
400
gpgme_data_release(dh_crypto);
198
401
return -1;
199
402
}
200
403
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
404
/* Decrypt data from the cryptotext data buffer to the plaintext
211
405
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));
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
407
if(rc != GPG_ERR_NO_ERROR){
408
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
409
gpgme_strsource(rc), gpgme_strerror(rc));
216
410
plaintext_length = -1;
217
if (debug){
411
if(debug){
218
412
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");
413
result = gpgme_op_decrypt_result(mc->ctx);
414
if(result == NULL){
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
222
416
} 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);
417
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
418
result->unsupported_algorithm);
419
fprintf_plus(stderr, "Wrong key usage: %u\n",
420
result->wrong_key_usage);
227
421
if(result->file_name != NULL){
228
fprintf(stderr, "File name: %s\n", result->file_name);
422
fprintf_plus(stderr, "File name: %s\n", result->file_name);
229
423
}
230
424
gpgme_recipient_t recipient;
231
425
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
}
426
while(recipient != NULL){
427
fprintf_plus(stderr, "Public key algorithm: %s\n",
428
gpgme_pubkey_algo_name
429
(recipient->pubkey_algo));
430
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
431
fprintf_plus(stderr, "Secret key available: %s\n",
432
recipient->status == GPG_ERR_NO_SECKEY
433
? "No" : "Yes");
434
recipient = recipient->next;
242
435
}
243
436
}
244
437
}
246
439
}
247
440
248
441
if(debug){
249
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
442
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
250
443
}
251
444
252
445
/* 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");
446
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
447
perror_plus("gpgme_data_seek");
255
448
plaintext_length = -1;
256
449
goto decrypt_end;
257
450
}
258
451
259
452
*plaintext = NULL;
260
453
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;
454
plaintext_capacity = incbuffer(plaintext,
455
(size_t)plaintext_length,
456
plaintext_capacity);
457
if(plaintext_capacity == 0){
458
perror_plus("incbuffer");
459
plaintext_length = -1;
460
goto decrypt_end;
268
461
}
269
462
270
463
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
271
464
BUFFER_SIZE);
272
465
/* Print the data, if any */
273
if (ret == 0){
466
if(ret == 0){
274
467
/* EOF */
275
468
break;
276
469
}
277
470
if(ret < 0){
278
perror("gpgme_data_read");
471
perror_plus("gpgme_data_read");
279
472
plaintext_length = -1;
280
473
goto decrypt_end;
281
474
}
282
475
plaintext_length += ret;
283
476
}
284
477
285
478
if(debug){
286
fprintf(stderr, "Decrypted password is: ");
479
fprintf_plus(stderr, "Decrypted password is: ");
287
480
for(ssize_t i = 0; i < plaintext_length; i++){
288
481
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
289
482
}
300
493
return plaintext_length;
301
494
}
302
495
303
static const char * safer_gnutls_strerror (int value) {
304
const char *ret = gnutls_strerror (value); /* Spurious warning */
305
if (ret == NULL)
306
ret = "(unknown)";
307
return ret;
496
__attribute__((warn_unused_result, const))
497
static const char *safe_string(const char *str){
498
if(str == NULL)
499
return "(unknown)";
500
return str;
501
}
502
503
__attribute__((warn_unused_result))
504
static const char *safer_gnutls_strerror(int value){
505
const char *ret = gnutls_strerror(value);
506
return safe_string(ret);
308
507
}
309
508
310
509
/* GnuTLS log function callback */
510
__attribute__((nonnull))
311
511
static void debuggnutls(__attribute__((unused)) int level,
312
512
const char* string){
313
fprintf(stderr, "GnuTLS: %s", string);
513
fprintf_plus(stderr, "GnuTLS: %s", string);
314
514
}
315
515
316
static int init_gnutls_global(mandos_context *mc,
317
const char *pubkeyfilename,
318
const char *seckeyfilename){
516
__attribute__((nonnull, warn_unused_result))
517
static int init_gnutls_global(const char *pubkeyfilename,
518
const char *seckeyfilename,
519
const char *dhparamsfilename,
520
mandos_context *mc){
319
521
int ret;
522
unsigned int uret;
320
523
321
524
if(debug){
322
fprintf(stderr, "Initializing GnuTLS\n");
525
fprintf_plus(stderr, "Initializing GnuTLS\n");
323
526
}
324
527
325
528
ret = gnutls_global_init();
326
if (ret != GNUTLS_E_SUCCESS) {
327
fprintf (stderr, "GnuTLS global_init: %s\n",
328
safer_gnutls_strerror(ret));
529
if(ret != GNUTLS_E_SUCCESS){
530
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
531
safer_gnutls_strerror(ret));
329
532
return -1;
330
533
}
331
534
332
if (debug){
535
if(debug){
333
536
/* "Use a log level over 10 to enable all debugging options."
334
537
* - GnuTLS manual
335
538
*/
338
541
}
339
542
340
543
/* 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 ();
544
ret = gnutls_certificate_allocate_credentials(&mc->cred);
545
if(ret != GNUTLS_E_SUCCESS){
546
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
547
safer_gnutls_strerror(ret));
548
gnutls_global_deinit();
347
549
return -1;
348
550
}
349
551
350
552
if(debug){
351
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
352
" and keyfile %s as GnuTLS credentials\n", pubkeyfilename,
353
seckeyfilename);
553
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
554
" secret key %s as GnuTLS credentials\n",
555
pubkeyfilename,
556
seckeyfilename);
354
557
}
355
558
356
559
ret = gnutls_certificate_set_openpgp_key_file
357
560
(mc->cred, pubkeyfilename, seckeyfilename,
358
561
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));
562
if(ret != GNUTLS_E_SUCCESS){
563
fprintf_plus(stderr,
564
"Error[%d] while reading the OpenPGP key pair ('%s',"
565
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
566
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
567
safer_gnutls_strerror(ret));
365
568
goto globalfail;
366
569
}
367
570
368
571
/* GnuTLS server initialization */
369
572
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));
373
goto globalfail;
374
}
375
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));
379
goto globalfail;
380
}
381
573
if(ret != GNUTLS_E_SUCCESS){
574
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
575
" initialization: %s\n",
576
safer_gnutls_strerror(ret));
577
goto globalfail;
578
}
579
/* If a Diffie-Hellman parameters file was given, try to use it */
580
if(dhparamsfilename != NULL){
581
gnutls_datum_t params = { .data = NULL, .size = 0 };
582
do {
583
int dhpfile = open(dhparamsfilename, O_RDONLY);
584
if(dhpfile == -1){
585
perror_plus("open");
586
dhparamsfilename = NULL;
587
break;
588
}
589
size_t params_capacity = 0;
590
while(true){
591
params_capacity = incbuffer((char **)¶ms.data,
592
(size_t)params.size,
593
(size_t)params_capacity);
594
if(params_capacity == 0){
595
perror_plus("incbuffer");
596
free(params.data);
597
params.data = NULL;
598
dhparamsfilename = NULL;
599
break;
600
}
601
ssize_t bytes_read = read(dhpfile,
602
params.data + params.size,
603
BUFFER_SIZE);
604
/* EOF */
605
if(bytes_read == 0){
606
break;
607
}
608
/* check bytes_read for failure */
609
if(bytes_read < 0){
610
perror_plus("read");
611
free(params.data);
612
params.data = NULL;
613
dhparamsfilename = NULL;
614
break;
615
}
616
params.size += (unsigned int)bytes_read;
617
}
618
if(params.data == NULL){
619
dhparamsfilename = NULL;
620
}
621
if(dhparamsfilename == NULL){
622
break;
623
}
624
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
625
GNUTLS_X509_FMT_PEM);
626
if(ret != GNUTLS_E_SUCCESS){
627
fprintf_plus(stderr, "Failed to parse DH parameters in file"
628
" \"%s\": %s\n", dhparamsfilename,
629
safer_gnutls_strerror(ret));
630
dhparamsfilename = NULL;
631
}
632
} while(false);
633
}
634
if(dhparamsfilename == NULL){
635
if(mc->dh_bits == 0){
636
/* Find out the optimal number of DH bits */
637
/* Try to read the private key file */
638
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
639
do {
640
int secfile = open(seckeyfilename, O_RDONLY);
641
if(secfile == -1){
642
perror_plus("open");
643
break;
644
}
645
size_t buffer_capacity = 0;
646
while(true){
647
buffer_capacity = incbuffer((char **)&buffer.data,
648
(size_t)buffer.size,
649
(size_t)buffer_capacity);
650
if(buffer_capacity == 0){
651
perror_plus("incbuffer");
652
free(buffer.data);
653
buffer.data = NULL;
654
break;
655
}
656
ssize_t bytes_read = read(secfile,
657
buffer.data + buffer.size,
658
BUFFER_SIZE);
659
/* EOF */
660
if(bytes_read == 0){
661
break;
662
}
663
/* check bytes_read for failure */
664
if(bytes_read < 0){
665
perror_plus("read");
666
free(buffer.data);
667
buffer.data = NULL;
668
break;
669
}
670
buffer.size += (unsigned int)bytes_read;
671
}
672
close(secfile);
673
} while(false);
674
/* If successful, use buffer to parse private key */
675
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
676
if(buffer.data != NULL){
677
{
678
gnutls_openpgp_privkey_t privkey = NULL;
679
ret = gnutls_openpgp_privkey_init(&privkey);
680
if(ret != GNUTLS_E_SUCCESS){
681
fprintf_plus(stderr, "Error initializing OpenPGP key"
682
" structure: %s",
683
safer_gnutls_strerror(ret));
684
free(buffer.data);
685
buffer.data = NULL;
686
} else {
687
ret = gnutls_openpgp_privkey_import
688
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
689
if(ret != GNUTLS_E_SUCCESS){
690
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
691
safer_gnutls_strerror(ret));
692
privkey = NULL;
693
}
694
free(buffer.data);
695
buffer.data = NULL;
696
if(privkey != NULL){
697
/* Use private key to suggest an appropriate
698
sec_param */
699
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
700
gnutls_openpgp_privkey_deinit(privkey);
701
if(debug){
702
fprintf_plus(stderr, "This OpenPGP key implies using"
703
" a GnuTLS security parameter \"%s\".\n",
704
safe_string(gnutls_sec_param_get_name
705
(sec_param)));
706
}
707
}
708
}
709
}
710
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
711
/* Err on the side of caution */
712
sec_param = GNUTLS_SEC_PARAM_ULTRA;
713
if(debug){
714
fprintf_plus(stderr, "Falling back to security parameter"
715
" \"%s\"\n",
716
safe_string(gnutls_sec_param_get_name
717
(sec_param)));
718
}
719
}
720
}
721
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
722
if(uret != 0){
723
mc->dh_bits = uret;
724
if(debug){
725
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
726
" implies %u DH bits; using that.\n",
727
safe_string(gnutls_sec_param_get_name
728
(sec_param)),
729
mc->dh_bits);
730
}
731
} else {
732
fprintf_plus(stderr, "Failed to get implied number of DH"
733
" bits for security parameter \"%s\"): %s\n",
734
safe_string(gnutls_sec_param_get_name
735
(sec_param)),
736
safer_gnutls_strerror(ret));
737
goto globalfail;
738
}
739
} else if(debug){
740
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
741
mc->dh_bits);
742
}
743
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
744
if(ret != GNUTLS_E_SUCCESS){
745
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
746
" bits): %s\n", mc->dh_bits,
747
safer_gnutls_strerror(ret));
748
goto globalfail;
749
}
750
}
382
751
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
383
752
384
753
return 0;
385
754
386
755
globalfail:
387
756
388
757
gnutls_certificate_free_credentials(mc->cred);
389
758
gnutls_global_deinit();
759
gnutls_dh_params_deinit(mc->dh_params);
390
760
return -1;
391
392
761
}
393
762
394
static int init_gnutls_session(mandos_context *mc,
395
gnutls_session_t *session){
763
__attribute__((nonnull, warn_unused_result))
764
static int init_gnutls_session(gnutls_session_t *session,
765
mandos_context *mc){
396
766
int ret;
397
767
/* 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));
768
do {
769
ret = gnutls_init(session, GNUTLS_SERVER);
770
if(quit_now){
771
return -1;
772
}
773
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
774
if(ret != GNUTLS_E_SUCCESS){
775
fprintf_plus(stderr,
776
"Error in GnuTLS session initialization: %s\n",
777
safer_gnutls_strerror(ret));
402
778
}
403
779
404
780
{
405
781
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);
782
do {
783
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
784
if(quit_now){
785
gnutls_deinit(*session);
786
return -1;
787
}
788
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
789
if(ret != GNUTLS_E_SUCCESS){
790
fprintf_plus(stderr, "Syntax error at: %s\n", err);
791
fprintf_plus(stderr, "GnuTLS error: %s\n",
792
safer_gnutls_strerror(ret));
793
gnutls_deinit(*session);
412
794
return -1;
413
795
}
414
796
}
415
797
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);
798
do {
799
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
800
mc->cred);
801
if(quit_now){
802
gnutls_deinit(*session);
803
return -1;
804
}
805
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
806
if(ret != GNUTLS_E_SUCCESS){
807
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
808
safer_gnutls_strerror(ret));
809
gnutls_deinit(*session);
422
810
return -1;
423
811
}
424
812
425
813
/* ignore client certificate if any. */
426
gnutls_certificate_server_set_request (*session,
427
GNUTLS_CERT_IGNORE);
428
429
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
814
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
430
815
431
816
return 0;
432
817
}
435
820
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
436
821
__attribute__((unused)) const char *txt){}
437
822
823
/* Set effective uid to 0, return errno */
824
__attribute__((warn_unused_result))
825
error_t raise_privileges(void){
826
error_t old_errno = errno;
827
error_t ret_errno = 0;
828
if(seteuid(0) == -1){
829
ret_errno = errno;
830
}
831
errno = old_errno;
832
return ret_errno;
833
}
834
835
/* Set effective and real user ID to 0. Return errno. */
836
__attribute__((warn_unused_result))
837
error_t raise_privileges_permanently(void){
838
error_t old_errno = errno;
839
error_t ret_errno = raise_privileges();
840
if(ret_errno != 0){
841
errno = old_errno;
842
return ret_errno;
843
}
844
if(setuid(0) == -1){
845
ret_errno = errno;
846
}
847
errno = old_errno;
848
return ret_errno;
849
}
850
851
/* Set effective user ID to unprivileged saved user ID */
852
__attribute__((warn_unused_result))
853
error_t lower_privileges(void){
854
error_t old_errno = errno;
855
error_t ret_errno = 0;
856
if(seteuid(uid) == -1){
857
ret_errno = errno;
858
}
859
errno = old_errno;
860
return ret_errno;
861
}
862
863
/* Lower privileges permanently */
864
__attribute__((warn_unused_result))
865
error_t lower_privileges_permanently(void){
866
error_t old_errno = errno;
867
error_t ret_errno = 0;
868
if(setuid(uid) == -1){
869
ret_errno = errno;
870
}
871
errno = old_errno;
872
return ret_errno;
873
}
874
875
/* Helper function to add_local_route() and delete_local_route() */
876
__attribute__((nonnull, warn_unused_result))
877
static bool add_delete_local_route(const bool add,
878
const char *address,
879
AvahiIfIndex if_index){
880
int ret;
881
char helper[] = "mandos-client-iprouteadddel";
882
char add_arg[] = "add";
883
char delete_arg[] = "delete";
884
char debug_flag[] = "--debug";
885
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
886
if(pluginhelperdir == NULL){
887
if(debug){
888
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
889
" variable not set; cannot run helper\n");
890
}
891
return false;
892
}
893
894
char interface[IF_NAMESIZE];
895
if(if_indextoname((unsigned int)if_index, interface) == NULL){
896
perror_plus("if_indextoname");
897
return false;
898
}
899
900
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
901
if(devnull == -1){
902
perror_plus("open(\"/dev/null\", O_RDONLY)");
903
return false;
904
}
905
pid_t pid = fork();
906
if(pid == 0){
907
/* Child */
908
/* Raise privileges */
909
errno = raise_privileges_permanently();
910
if(errno != 0){
911
perror_plus("Failed to raise privileges");
912
/* _exit(EX_NOPERM); */
913
} else {
914
/* Set group */
915
errno = 0;
916
ret = setgid(0);
917
if(ret == -1){
918
perror_plus("setgid");
919
_exit(EX_NOPERM);
920
}
921
/* Reset supplementary groups */
922
errno = 0;
923
ret = setgroups(0, NULL);
924
if(ret == -1){
925
perror_plus("setgroups");
926
_exit(EX_NOPERM);
927
}
928
}
929
ret = dup2(devnull, STDIN_FILENO);
930
if(ret == -1){
931
perror_plus("dup2(devnull, STDIN_FILENO)");
932
_exit(EX_OSERR);
933
}
934
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
935
if(ret == -1){
936
perror_plus("close");
937
_exit(EX_OSERR);
938
}
939
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
940
if(ret == -1){
941
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
942
_exit(EX_OSERR);
943
}
944
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
945
O_RDONLY
946
| O_DIRECTORY
947
| O_PATH
948
| O_CLOEXEC));
949
if(helperdir_fd == -1){
950
perror_plus("open");
951
_exit(EX_UNAVAILABLE);
952
}
953
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
954
helper, O_RDONLY));
955
if(helper_fd == -1){
956
perror_plus("openat");
957
_exit(EX_UNAVAILABLE);
958
}
959
TEMP_FAILURE_RETRY(close(helperdir_fd));
960
#ifdef __GNUC__
961
#pragma GCC diagnostic push
962
#pragma GCC diagnostic ignored "-Wcast-qual"
963
#endif
964
if(fexecve(helper_fd, (char *const [])
965
{ helper, add ? add_arg : delete_arg, (char *)address,
966
interface, debug ? debug_flag : NULL, NULL },
967
environ) == -1){
968
#ifdef __GNUC__
969
#pragma GCC diagnostic pop
970
#endif
971
perror_plus("fexecve");
972
_exit(EXIT_FAILURE);
973
}
974
}
975
if(pid == -1){
976
perror_plus("fork");
977
return false;
978
}
979
int status;
980
pid_t pret = -1;
981
errno = 0;
982
do {
983
pret = waitpid(pid, &status, 0);
984
if(pret == -1 and errno == EINTR and quit_now){
985
int errno_raising = 0;
986
if((errno = raise_privileges()) != 0){
987
errno_raising = errno;
988
perror_plus("Failed to raise privileges in order to"
989
" kill helper program");
990
}
991
if(kill(pid, SIGTERM) == -1){
992
perror_plus("kill");
993
}
994
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
995
perror_plus("Failed to lower privileges after killing"
996
" helper program");
997
}
998
return false;
999
}
1000
} while(pret == -1 and errno == EINTR);
1001
if(pret == -1){
1002
perror_plus("waitpid");
1003
return false;
1004
}
1005
if(WIFEXITED(status)){
1006
if(WEXITSTATUS(status) != 0){
1007
fprintf_plus(stderr, "Error: iprouteadddel exited"
1008
" with status %d\n", WEXITSTATUS(status));
1009
return false;
1010
}
1011
return true;
1012
}
1013
if(WIFSIGNALED(status)){
1014
fprintf_plus(stderr, "Error: iprouteadddel died by"
1015
" signal %d\n", WTERMSIG(status));
1016
return false;
1017
}
1018
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1019
return false;
1020
}
1021
1022
__attribute__((nonnull, warn_unused_result))
1023
static bool add_local_route(const char *address,
1024
AvahiIfIndex if_index){
1025
if(debug){
1026
fprintf_plus(stderr, "Adding route to %s\n", address);
1027
}
1028
return add_delete_local_route(true, address, if_index);
1029
}
1030
1031
__attribute__((nonnull, warn_unused_result))
1032
static bool delete_local_route(const char *address,
1033
AvahiIfIndex if_index){
1034
if(debug){
1035
fprintf_plus(stderr, "Removing route to %s\n", address);
1036
}
1037
return add_delete_local_route(false, address, if_index);
1038
}
1039
438
1040
/* Called when a Mandos server is found */
439
static int start_mandos_communication(const char *ip, uint16_t port,
1041
__attribute__((nonnull, warn_unused_result))
1042
static int start_mandos_communication(const char *ip, in_port_t port,
440
1043
AvahiIfIndex if_index,
441
mandos_context *mc){
442
int ret, tcp_sd;
443
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
1044
int af, mandos_context *mc){
1045
int ret, tcp_sd = -1;
1046
ssize_t sret;
1047
struct sockaddr_storage to;
444
1048
char *buffer = NULL;
445
char *decrypted_buffer;
1049
char *decrypted_buffer = NULL;
446
1050
size_t buffer_length = 0;
447
1051
size_t buffer_capacity = 0;
448
ssize_t decrypted_buffer_size;
449
1052
size_t written;
450
int retval = 0;
451
char interface[IF_NAMESIZE];
1053
int retval = -1;
452
1054
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");
1055
int pf; /* Protocol family */
1056
bool route_added = false;
1057
1058
errno = 0;
1059
1060
if(quit_now){
1061
errno = EINTR;
1062
return -1;
1063
}
1064
1065
switch(af){
1066
case AF_INET6:
1067
pf = PF_INET6;
1068
break;
1069
case AF_INET:
1070
pf = PF_INET;
1071
break;
1072
default:
1073
fprintf_plus(stderr, "Bad address family: %d\n", af);
1074
errno = EINVAL;
1075
return -1;
1076
}
1077
1078
/* If the interface is specified and we have a list of interfaces */
1079
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1080
/* Check if the interface is one of the interfaces we are using */
1081
bool match = false;
1082
{
1083
char *interface = NULL;
1084
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1085
interface))){
1086
if(if_nametoindex(interface) == (unsigned int)if_index){
1087
match = true;
1088
break;
1089
}
1090
}
1091
}
1092
if(not match){
1093
/* This interface does not match any in the list, so we don't
1094
connect to the server */
1095
if(debug){
1096
char interface[IF_NAMESIZE];
1097
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1098
perror_plus("if_indextoname");
1099
} else {
1100
fprintf_plus(stderr, "Skipping server on non-used interface"
1101
" \"%s\"\n",
1102
if_indextoname((unsigned int)if_index,
1103
interface));
1104
}
1105
}
473
1106
return -1;
474
1107
}
475
fprintf(stderr, "Binding to interface %s\n", interface);
476
1108
}
477
1109
478
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");
1110
ret = init_gnutls_session(&session, mc);
1111
if(ret != 0){
485
1112
return -1;
486
1113
}
1114
1115
if(debug){
1116
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1117
PRIuMAX "\n", ip, (uintmax_t)port);
1118
}
1119
1120
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
1121
if(tcp_sd < 0){
1122
int e = errno;
1123
perror_plus("socket");
1124
errno = e;
1125
goto mandos_end;
1126
}
1127
1128
if(quit_now){
1129
errno = EINTR;
1130
goto mandos_end;
1131
}
1132
1133
if(af == AF_INET6){
1134
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1135
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1136
ret = inet_pton(af, ip, &to6->sin6_addr);
1137
} else { /* IPv4 */
1138
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1139
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1140
ret = inet_pton(af, ip, &to4->sin_addr);
1141
}
1142
if(ret < 0 ){
1143
int e = errno;
1144
perror_plus("inet_pton");
1145
errno = e;
1146
goto mandos_end;
1147
}
487
1148
if(ret == 0){
488
fprintf(stderr, "Bad address: %s\n", ip);
489
return -1;
490
}
491
to.in6.sin6_port = htons(port); /* Spurious warning */
1149
int e = errno;
1150
fprintf_plus(stderr, "Bad address: %s\n", ip);
1151
errno = e;
1152
goto mandos_end;
1153
}
1154
if(af == AF_INET6){
1155
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1156
if(IN6_IS_ADDR_LINKLOCAL
1157
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
1158
if(if_index == AVAHI_IF_UNSPEC){
1159
fprintf_plus(stderr, "An IPv6 link-local address is"
1160
" incomplete without a network interface\n");
1161
errno = EINVAL;
1162
goto mandos_end;
1163
}
1164
/* Set the network interface number as scope */
1165
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
1166
}
1167
} else {
1168
((struct sockaddr_in *)&to)->sin_port = htons(port);
1169
}
492
1170
493
to.in6.sin6_scope_id = (uint32_t)if_index;
1171
if(quit_now){
1172
errno = EINTR;
1173
goto mandos_end;
1174
}
494
1175
495
1176
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);
505
}
506
}
507
}
508
509
ret = connect(tcp_sd, &to.in, sizeof(to));
510
if (ret < 0){
511
perror("connect");
512
return -1;
513
}
514
1177
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
1178
char interface[IF_NAMESIZE];
1179
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1180
perror_plus("if_indextoname");
1181
} else {
1182
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1183
"\n", ip, interface, (uintmax_t)port);
1184
}
1185
} else {
1186
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1187
ip, (uintmax_t)port);
1188
}
1189
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1190
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1191
if(af == AF_INET6){
1192
ret = getnameinfo((struct sockaddr *)&to,
1193
sizeof(struct sockaddr_in6),
1194
addrstr, sizeof(addrstr), NULL, 0,
1195
NI_NUMERICHOST);
1196
} else {
1197
ret = getnameinfo((struct sockaddr *)&to,
1198
sizeof(struct sockaddr_in),
1199
addrstr, sizeof(addrstr), NULL, 0,
1200
NI_NUMERICHOST);
1201
}
1202
if(ret == EAI_SYSTEM){
1203
perror_plus("getnameinfo");
1204
} else if(ret != 0) {
1205
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1206
} else if(strcmp(addrstr, ip) != 0){
1207
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1208
}
1209
}
1210
1211
if(quit_now){
1212
errno = EINTR;
1213
goto mandos_end;
1214
}
1215
1216
while(true){
1217
if(af == AF_INET6){
1218
ret = connect(tcp_sd, (struct sockaddr *)&to,
1219
sizeof(struct sockaddr_in6));
1220
} else {
1221
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1222
sizeof(struct sockaddr_in));
1223
}
1224
if(ret < 0){
1225
if(errno == ENETUNREACH
1226
and if_index != AVAHI_IF_UNSPEC
1227
and connect_to == NULL
1228
and not route_added and
1229
((af == AF_INET6 and not
1230
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1231
&to)->sin6_addr)))
1232
or (af == AF_INET and
1233
/* Not a a IPv4LL address */
1234
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1235
& 0xFFFF0000L) != 0xA9FE0000L))){
1236
/* Work around Avahi bug - Avahi does not announce link-local
1237
addresses if it has a global address, so local hosts with
1238
*only* a link-local address (e.g. Mandos clients) cannot
1239
connect to a Mandos server announced by Avahi on a server
1240
host with a global address. Work around this by retrying
1241
with an explicit route added with the server's address.
1242
1243
Avahi bug reference:
1244
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1245
https://bugs.debian.org/587961
1246
*/
1247
if(debug){
1248
fprintf_plus(stderr, "Mandos server unreachable, trying"
1249
" direct route\n");
1250
}
1251
int e = errno;
1252
route_added = add_local_route(ip, if_index);
1253
if(route_added){
1254
continue;
1255
}
1256
errno = e;
1257
}
1258
if(errno != ECONNREFUSED or debug){
1259
int e = errno;
1260
perror_plus("connect");
1261
errno = e;
1262
}
1263
goto mandos_end;
1264
}
1265
1266
if(quit_now){
1267
errno = EINTR;
1268
goto mandos_end;
1269
}
1270
break;
1271
}
1272
515
1273
const char *out = mandos_protocol_version;
516
1274
written = 0;
517
while (true){
1275
while(true){
518
1276
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;
1277
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
1278
out_size - written));
1279
if(ret == -1){
1280
int e = errno;
1281
perror_plus("write");
1282
errno = e;
524
1283
goto mandos_end;
525
1284
}
526
1285
written += (size_t)ret;
527
1286
if(written < out_size){
528
1287
continue;
529
1288
} else {
530
if (out == mandos_protocol_version){
1289
if(out == mandos_protocol_version){
531
1290
written = 0;
532
1291
out = "\r\n";
533
1292
} else {
534
1293
break;
535
1294
}
536
1295
}
1296
1297
if(quit_now){
1298
errno = EINTR;
1299
goto mandos_end;
1300
}
537
1301
}
538
1302
539
1303
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);
1304
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
1305
}
1306
1307
if(quit_now){
1308
errno = EINTR;
1309
goto mandos_end;
1310
}
1311
1312
/* This casting via intptr_t is to eliminate warning about casting
1313
an int to a pointer type. This is exactly how the GnuTLS Guile
1314
function "set-session-transport-fd!" does it. */
1315
gnutls_transport_set_ptr(session,
1316
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
1317
1318
if(quit_now){
1319
errno = EINTR;
1320
goto mandos_end;
1321
}
1322
1323
do {
1324
ret = gnutls_handshake(session);
1325
if(quit_now){
1326
errno = EINTR;
1327
goto mandos_end;
1328
}
547
1329
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
548
1330
549
if (ret != GNUTLS_E_SUCCESS){
1331
if(ret != GNUTLS_E_SUCCESS){
550
1332
if(debug){
551
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
552
gnutls_perror (ret);
1333
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
1334
gnutls_perror(ret);
553
1335
}
554
retval = -1;
1336
errno = EPROTO;
555
1337
goto mandos_end;
556
1338
}
557
1339
558
1340
/* Read OpenPGP packet that contains the wanted password */
559
1341
560
1342
if(debug){
561
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
562
ip);
1343
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1344
" %s\n", ip);
563
1345
}
564
1346
565
1347
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){
1348
1349
if(quit_now){
1350
errno = EINTR;
1351
goto mandos_end;
1352
}
1353
1354
buffer_capacity = incbuffer(&buffer, buffer_length,
1355
buffer_capacity);
1356
if(buffer_capacity == 0){
1357
int e = errno;
1358
perror_plus("incbuffer");
1359
errno = e;
1360
goto mandos_end;
1361
}
1362
1363
if(quit_now){
1364
errno = EINTR;
1365
goto mandos_end;
1366
}
1367
1368
sret = gnutls_record_recv(session, buffer+buffer_length,
1369
BUFFER_SIZE);
1370
if(sret == 0){
577
1371
break;
578
1372
}
579
if (ret < 0){
580
switch(ret){
1373
if(sret < 0){
1374
switch(sret){
581
1375
case GNUTLS_E_INTERRUPTED:
582
1376
case GNUTLS_E_AGAIN:
583
1377
break;
584
1378
case GNUTLS_E_REHANDSHAKE:
585
do{
586
ret = gnutls_handshake (session);
1379
do {
1380
ret = gnutls_handshake(session);
1381
1382
if(quit_now){
1383
errno = EINTR;
1384
goto mandos_end;
1385
}
587
1386
} 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;
1387
if(ret < 0){
1388
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1389
"***\n");
1390
gnutls_perror(ret);
1391
errno = EPROTO;
592
1392
goto mandos_end;
593
1393
}
594
1394
break;
595
1395
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);
1396
fprintf_plus(stderr, "Unknown error while reading data from"
1397
" encrypted session with Mandos server\n");
1398
gnutls_bye(session, GNUTLS_SHUT_RDWR);
1399
errno = EIO;
600
1400
goto mandos_end;
601
1401
}
602
1402
} else {
603
buffer_length += (size_t) ret;
1403
buffer_length += (size_t) sret;
604
1404
}
605
1405
}
606
1406
607
1407
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){
1408
fprintf_plus(stderr, "Closing TLS session\n");
1409
}
1410
1411
if(quit_now){
1412
errno = EINTR;
1413
goto mandos_end;
1414
}
1415
1416
do {
1417
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
1418
if(quit_now){
1419
errno = EINTR;
1420
goto mandos_end;
1421
}
1422
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1423
1424
if(buffer_length > 0){
1425
ssize_t decrypted_buffer_size;
1426
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1427
&decrypted_buffer, mc);
1428
if(decrypted_buffer_size >= 0){
1429
619
1430
written = 0;
620
1431
while(written < (size_t) decrypted_buffer_size){
621
ret = (int)fwrite (decrypted_buffer + written, 1,
622
(size_t)decrypted_buffer_size - written,
623
stdout);
1432
if(quit_now){
1433
errno = EINTR;
1434
goto mandos_end;
1435
}
1436
1437
ret = (int)fwrite(decrypted_buffer + written, 1,
1438
(size_t)decrypted_buffer_size - written,
1439
stdout);
624
1440
if(ret == 0 and ferror(stdout)){
1441
int e = errno;
625
1442
if(debug){
626
fprintf(stderr, "Error writing encrypted data: %s\n",
627
strerror(errno));
1443
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1444
strerror(errno));
628
1445
}
629
retval = -1;
630
break;
1446
errno = e;
1447
goto mandos_end;
631
1448
}
632
1449
written += (size_t)ret;
633
1450
}
634
free(decrypted_buffer);
635
} else {
636
retval = -1;
1451
retval = 0;
637
1452
}
638
} else {
639
retval = -1;
640
1453
}
641
1454
642
1455
/* Shutdown procedure */
643
1456
644
1457
mandos_end:
645
free(buffer);
646
close(tcp_sd);
647
gnutls_deinit (session);
1458
{
1459
if(route_added){
1460
if(not delete_local_route(ip, if_index)){
1461
fprintf_plus(stderr, "Failed to delete local route to %s on"
1462
" interface %d", ip, if_index);
1463
}
1464
}
1465
int e = errno;
1466
free(decrypted_buffer);
1467
free(buffer);
1468
if(tcp_sd >= 0){
1469
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1470
}
1471
if(ret == -1){
1472
if(e == 0){
1473
e = errno;
1474
}
1475
perror_plus("close");
1476
}
1477
gnutls_deinit(session);
1478
errno = e;
1479
if(quit_now){
1480
errno = EINTR;
1481
retval = -1;
1482
}
1483
}
648
1484
return retval;
649
1485
}
650
1486
1487
__attribute__((nonnull))
651
1488
static void resolve_callback(AvahiSServiceResolver *r,
652
1489
AvahiIfIndex interface,
653
AVAHI_GCC_UNUSED AvahiProtocol protocol,
1490
AvahiProtocol proto,
654
1491
AvahiResolverEvent event,
655
1492
const char *name,
656
1493
const char *type,
661
1498
AVAHI_GCC_UNUSED AvahiStringList *txt,
662
1499
AVAHI_GCC_UNUSED AvahiLookupResultFlags
663
1500
flags,
664
void* userdata) {
665
mandos_context *mc = userdata;
666
assert(r);
1501
void *mc){
1502
if(r == NULL){
1503
return;
1504
}
667
1505
668
1506
/* Called whenever a service has been resolved successfully or
669
1507
timed out */
670
1508
671
switch (event) {
1509
if(quit_now){
1510
avahi_s_service_resolver_free(r);
1511
return;
1512
}
1513
1514
switch(event){
672
1515
default:
673
1516
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)));
1517
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1518
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1519
domain,
1520
avahi_strerror(avahi_server_errno
1521
(((mandos_context*)mc)->server)));
677
1522
break;
678
1523
679
1524
case AVAHI_RESOLVER_FOUND:
681
1526
char ip[AVAHI_ADDRESS_STR_MAX];
682
1527
avahi_address_snprint(ip, sizeof(ip), address);
683
1528
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);
1529
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1530
PRIdMAX ") on port %" PRIu16 "\n", name,
1531
host_name, ip, (intmax_t)interface, port);
687
1532
}
688
int ret = start_mandos_communication(ip, port, interface, mc);
689
if (ret == 0){
690
avahi_simple_poll_quit(mc->simple_poll);
1533
int ret = start_mandos_communication(ip, (in_port_t)port,
1534
interface,
1535
avahi_proto_to_af(proto),
1536
mc);
1537
if(ret == 0){
1538
avahi_simple_poll_quit(simple_poll);
1539
} else {
1540
if(not add_server(ip, (in_port_t)port, interface,
1541
avahi_proto_to_af(proto),
1542
&((mandos_context*)mc)->current_server)){
1543
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1544
" list\n", name);
1545
}
691
1546
}
692
1547
}
693
1548
}
694
1549
avahi_s_service_resolver_free(r);
695
1550
}
696
1551
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);
1552
static void browse_callback(AvahiSServiceBrowser *b,
1553
AvahiIfIndex interface,
1554
AvahiProtocol protocol,
1555
AvahiBrowserEvent event,
1556
const char *name,
1557
const char *type,
1558
const char *domain,
1559
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1560
flags,
1561
void *mc){
1562
if(b == NULL){
1563
return;
1564
}
709
1565
710
1566
/* Called whenever a new services becomes available on the LAN or
711
1567
is removed from the LAN */
712
1568
713
switch (event) {
1569
if(quit_now){
1570
return;
1571
}
1572
1573
switch(event){
714
1574
default:
715
1575
case AVAHI_BROWSER_FAILURE:
716
1576
717
fprintf(stderr, "(Avahi browser) %s\n",
718
avahi_strerror(avahi_server_errno(mc->server)));
719
avahi_simple_poll_quit(mc->simple_poll);
1577
fprintf_plus(stderr, "(Avahi browser) %s\n",
1578
avahi_strerror(avahi_server_errno
1579
(((mandos_context*)mc)->server)));
1580
avahi_simple_poll_quit(simple_poll);
720
1581
return;
721
1582
722
1583
case AVAHI_BROWSER_NEW:
725
1586
the callback function is called the Avahi server will free the
726
1587
resolver for us. */
727
1588
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)));
1589
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1590
interface, protocol, name, type,
1591
domain, protocol, 0,
1592
resolve_callback, mc) == NULL)
1593
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1594
" %s\n", name,
1595
avahi_strerror(avahi_server_errno
1596
(((mandos_context*)mc)->server)));
734
1597
break;
735
1598
736
1599
case AVAHI_BROWSER_REMOVE:
739
1602
case AVAHI_BROWSER_ALL_FOR_NOW:
740
1603
case AVAHI_BROWSER_CACHE_EXHAUSTED:
741
1604
if(debug){
742
fprintf(stderr, "No Mandos server found, still searching...\n");
1605
fprintf_plus(stderr, "No Mandos server found, still"
1606
" searching...\n");
743
1607
}
744
1608
break;
745
1609
}
746
1610
}
747
1611
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){
1612
/* Signal handler that stops main loop after SIGTERM */
1613
static void handle_sigterm(int sig){
1614
if(quit_now){
1615
return;
1616
}
1617
quit_now = 1;
1618
signal_received = sig;
1619
int old_errno = errno;
1620
/* set main loop to exit */
1621
if(simple_poll != NULL){
1622
avahi_simple_poll_quit(simple_poll);
1623
}
1624
errno = old_errno;
1625
}
1626
1627
__attribute__((nonnull, warn_unused_result))
1628
bool get_flags(const char *ifname, struct ifreq *ifr){
1629
int ret;
1630
error_t ret_errno;
1631
1632
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1633
if(s < 0){
1634
ret_errno = errno;
1635
perror_plus("socket");
1636
errno = ret_errno;
1637
return false;
1638
}
1639
strcpy(ifr->ifr_name, ifname);
1640
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1641
if(ret == -1){
1642
if(debug){
1643
ret_errno = errno;
1644
perror_plus("ioctl SIOCGIFFLAGS");
1645
errno = ret_errno;
1646
}
1647
return false;
1648
}
1649
return true;
1650
}
1651
1652
__attribute__((nonnull, warn_unused_result))
1653
bool good_flags(const char *ifname, const struct ifreq *ifr){
1654
1655
/* Reject the loopback device */
1656
if(ifr->ifr_flags & IFF_LOOPBACK){
1657
if(debug){
1658
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1659
ifname);
1660
}
1661
return false;
1662
}
1663
/* Accept point-to-point devices only if connect_to is specified */
1664
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1665
if(debug){
1666
fprintf_plus(stderr, "Accepting point-to-point interface"
1667
" \"%s\"\n", ifname);
1668
}
1669
return true;
1670
}
1671
/* Otherwise, reject non-broadcast-capable devices */
1672
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1673
if(debug){
1674
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1675
" \"%s\"\n", ifname);
1676
}
1677
return false;
1678
}
1679
/* Reject non-ARP interfaces (including dummy interfaces) */
1680
if(ifr->ifr_flags & IFF_NOARP){
1681
if(debug){
1682
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1683
ifname);
1684
}
1685
return false;
1686
}
1687
1688
/* Accept this device */
1689
if(debug){
1690
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1691
}
1692
return true;
1693
}
1694
1695
/*
1696
* This function determines if a directory entry in /sys/class/net
1697
* corresponds to an acceptable network device.
1698
* (This function is passed to scandir(3) as a filter function.)
1699
*/
1700
__attribute__((nonnull, warn_unused_result))
1701
int good_interface(const struct dirent *if_entry){
1702
if(if_entry->d_name[0] == '.'){
1703
return 0;
1704
}
1705
1706
struct ifreq ifr;
1707
if(not get_flags(if_entry->d_name, &ifr)){
1708
if(debug){
1709
fprintf_plus(stderr, "Failed to get flags for interface "
1710
"\"%s\"\n", if_entry->d_name);
1711
}
1712
return 0;
1713
}
1714
1715
if(not good_flags(if_entry->d_name, &ifr)){
1716
return 0;
1717
}
1718
return 1;
1719
}
1720
1721
/*
1722
* This function determines if a network interface is up.
1723
*/
1724
__attribute__((nonnull, warn_unused_result))
1725
bool interface_is_up(const char *interface){
1726
struct ifreq ifr;
1727
if(not get_flags(interface, &ifr)){
1728
if(debug){
1729
fprintf_plus(stderr, "Failed to get flags for interface "
1730
"\"%s\"\n", interface);
1731
}
1732
return false;
1733
}
1734
1735
return (bool)(ifr.ifr_flags & IFF_UP);
1736
}
1737
1738
/*
1739
* This function determines if a network interface is running
1740
*/
1741
__attribute__((nonnull, warn_unused_result))
1742
bool interface_is_running(const char *interface){
1743
struct ifreq ifr;
1744
if(not get_flags(interface, &ifr)){
1745
if(debug){
1746
fprintf_plus(stderr, "Failed to get flags for interface "
1747
"\"%s\"\n", interface);
1748
}
1749
return false;
1750
}
1751
1752
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1753
}
1754
1755
__attribute__((nonnull, pure, warn_unused_result))
1756
int notdotentries(const struct dirent *direntry){
1757
/* Skip "." and ".." */
1758
if(direntry->d_name[0] == '.'
1759
and (direntry->d_name[1] == '\0'
1760
or (direntry->d_name[1] == '.'
1761
and direntry->d_name[2] == '\0'))){
1762
return 0;
1763
}
1764
return 1;
1765
}
1766
1767
/* Is this directory entry a runnable program? */
1768
__attribute__((nonnull, warn_unused_result))
1769
int runnable_hook(const struct dirent *direntry){
1770
int ret;
1771
size_t sret;
1772
struct stat st;
1773
1774
if((direntry->d_name)[0] == '\0'){
1775
/* Empty name? */
1776
return 0;
1777
}
1778
1779
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1780
"abcdefghijklmnopqrstuvwxyz"
1781
"0123456789"
1782
"_.-");
1783
if((direntry->d_name)[sret] != '\0'){
1784
/* Contains non-allowed characters */
1785
if(debug){
1786
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1787
direntry->d_name);
1788
}
1789
return 0;
1790
}
1791
1792
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1793
if(ret == -1){
1794
if(debug){
1795
perror_plus("Could not stat hook");
1796
}
1797
return 0;
1798
}
1799
if(not (S_ISREG(st.st_mode))){
1800
/* Not a regular file */
1801
if(debug){
1802
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1803
direntry->d_name);
1804
}
1805
return 0;
1806
}
1807
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1808
/* Not executable */
1809
if(debug){
1810
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1811
direntry->d_name);
1812
}
1813
return 0;
1814
}
1815
if(debug){
1816
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1817
direntry->d_name);
1818
}
1819
return 1;
1820
}
1821
1822
__attribute__((nonnull, warn_unused_result))
1823
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1824
mandos_context *mc){
1825
int ret;
1826
struct timespec now;
1827
struct timespec waited_time;
1828
intmax_t block_time;
1829
1830
while(true){
1831
if(mc->current_server == NULL){
1832
if(debug){
1833
fprintf_plus(stderr, "Wait until first server is found."
1834
" No timeout!\n");
1835
}
1836
ret = avahi_simple_poll_iterate(s, -1);
1837
} else {
1838
if(debug){
1839
fprintf_plus(stderr, "Check current_server if we should run"
1840
" it, or wait\n");
1841
}
1842
/* the current time */
1843
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1844
if(ret == -1){
1845
perror_plus("clock_gettime");
1846
return -1;
1847
}
1848
/* Calculating in ms how long time between now and server
1849
who we visted longest time ago. Now - last seen. */
1850
waited_time.tv_sec = (now.tv_sec
1851
- mc->current_server->last_seen.tv_sec);
1852
waited_time.tv_nsec = (now.tv_nsec
1853
- mc->current_server->last_seen.tv_nsec);
1854
/* total time is 10s/10,000ms.
1855
Converting to s from ms by dividing by 1,000,
1856
and ns to ms by dividing by 1,000,000. */
1857
block_time = ((retry_interval
1858
- ((intmax_t)waited_time.tv_sec * 1000))
1859
- ((intmax_t)waited_time.tv_nsec / 1000000));
1860
1861
if(debug){
1862
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1863
block_time);
1864
}
1865
1866
if(block_time <= 0){
1867
ret = start_mandos_communication(mc->current_server->ip,
1868
mc->current_server->port,
1869
mc->current_server->if_index,
1870
mc->current_server->af, mc);
1871
if(ret == 0){
1872
avahi_simple_poll_quit(s);
1873
return 0;
1874
}
1875
ret = clock_gettime(CLOCK_MONOTONIC,
1876
&mc->current_server->last_seen);
1877
if(ret == -1){
1878
perror_plus("clock_gettime");
1879
return -1;
1880
}
1881
mc->current_server = mc->current_server->next;
1882
block_time = 0; /* Call avahi to find new Mandos
1883
servers, but don't block */
1884
}
1885
1886
ret = avahi_simple_poll_iterate(s, (int)block_time);
1887
}
1888
if(ret != 0){
1889
if(ret > 0 or errno != EINTR){
1890
return (ret != 1) ? ret : 0;
1891
}
1892
}
1893
}
1894
}
1895
1896
__attribute__((nonnull))
1897
void run_network_hooks(const char *mode, const char *interface,
1898
const float delay){
1899
struct dirent **direntries = NULL;
1900
if(hookdir_fd == -1){
1901
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1902
| O_CLOEXEC);
1903
if(hookdir_fd == -1){
1904
if(errno == ENOENT){
1905
if(debug){
1906
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1907
" found\n", hookdir);
1908
}
1909
} else {
1910
perror_plus("open");
1911
}
1912
return;
1913
}
1914
}
1915
#ifdef __GLIBC__
1916
#if __GLIBC_PREREQ(2, 15)
1917
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1918
runnable_hook, alphasort);
1919
#else /* not __GLIBC_PREREQ(2, 15) */
1920
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1921
alphasort);
1922
#endif /* not __GLIBC_PREREQ(2, 15) */
1923
#else /* not __GLIBC__ */
1924
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1925
alphasort);
1926
#endif /* not __GLIBC__ */
1927
if(numhooks == -1){
1928
perror_plus("scandir");
1929
return;
1930
}
1931
struct dirent *direntry;
1932
int ret;
1933
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1934
if(devnull == -1){
1935
perror_plus("open(\"/dev/null\", O_RDONLY)");
1936
return;
1937
}
1938
for(int i = 0; i < numhooks; i++){
1939
direntry = direntries[i];
1940
if(debug){
1941
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1942
direntry->d_name);
1943
}
1944
pid_t hook_pid = fork();
1945
if(hook_pid == 0){
1946
/* Child */
1947
/* Raise privileges */
1948
errno = raise_privileges_permanently();
1949
if(errno != 0){
1950
perror_plus("Failed to raise privileges");
1951
_exit(EX_NOPERM);
1952
}
1953
/* Set group */
1954
errno = 0;
1955
ret = setgid(0);
1956
if(ret == -1){
1957
perror_plus("setgid");
1958
_exit(EX_NOPERM);
1959
}
1960
/* Reset supplementary groups */
1961
errno = 0;
1962
ret = setgroups(0, NULL);
1963
if(ret == -1){
1964
perror_plus("setgroups");
1965
_exit(EX_NOPERM);
1966
}
1967
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1968
if(ret == -1){
1969
perror_plus("setenv");
1970
_exit(EX_OSERR);
1971
}
1972
ret = setenv("DEVICE", interface, 1);
1973
if(ret == -1){
1974
perror_plus("setenv");
1975
_exit(EX_OSERR);
1976
}
1977
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1978
if(ret == -1){
1979
perror_plus("setenv");
1980
_exit(EX_OSERR);
1981
}
1982
ret = setenv("MODE", mode, 1);
1983
if(ret == -1){
1984
perror_plus("setenv");
1985
_exit(EX_OSERR);
1986
}
1987
char *delaystring;
1988
ret = asprintf(&delaystring, "%f", (double)delay);
1989
if(ret == -1){
1990
perror_plus("asprintf");
1991
_exit(EX_OSERR);
1992
}
1993
ret = setenv("DELAY", delaystring, 1);
1994
if(ret == -1){
1995
free(delaystring);
1996
perror_plus("setenv");
1997
_exit(EX_OSERR);
1998
}
1999
free(delaystring);
2000
if(connect_to != NULL){
2001
ret = setenv("CONNECT", connect_to, 1);
2002
if(ret == -1){
2003
perror_plus("setenv");
2004
_exit(EX_OSERR);
2005
}
2006
}
2007
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2008
direntry->d_name,
2009
O_RDONLY));
2010
if(hook_fd == -1){
2011
perror_plus("openat");
2012
_exit(EXIT_FAILURE);
2013
}
2014
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2015
perror_plus("close");
2016
_exit(EXIT_FAILURE);
2017
}
2018
ret = dup2(devnull, STDIN_FILENO);
2019
if(ret == -1){
2020
perror_plus("dup2(devnull, STDIN_FILENO)");
2021
_exit(EX_OSERR);
2022
}
2023
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
2024
if(ret == -1){
2025
perror_plus("close");
2026
_exit(EX_OSERR);
2027
}
2028
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2029
if(ret == -1){
2030
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2031
_exit(EX_OSERR);
2032
}
2033
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2034
environ) == -1){
2035
perror_plus("fexecve");
2036
_exit(EXIT_FAILURE);
2037
}
2038
} else {
2039
if(hook_pid == -1){
2040
perror_plus("fork");
2041
free(direntry);
2042
continue;
2043
}
2044
int status;
2045
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2046
perror_plus("waitpid");
2047
free(direntry);
2048
continue;
2049
}
2050
if(WIFEXITED(status)){
2051
if(WEXITSTATUS(status) != 0){
2052
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2053
" with status %d\n", direntry->d_name,
2054
WEXITSTATUS(status));
2055
free(direntry);
2056
continue;
2057
}
2058
} else if(WIFSIGNALED(status)){
2059
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2060
" signal %d\n", direntry->d_name,
2061
WTERMSIG(status));
2062
free(direntry);
2063
continue;
2064
} else {
2065
fprintf_plus(stderr, "Warning: network hook \"%s\""
2066
" crashed\n", direntry->d_name);
2067
free(direntry);
2068
continue;
2069
}
2070
}
2071
if(debug){
2072
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2073
direntry->d_name);
2074
}
2075
free(direntry);
2076
}
2077
free(direntries);
2078
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2079
perror_plus("close");
2080
} else {
2081
hookdir_fd = -1;
2082
}
2083
close(devnull);
2084
}
2085
2086
__attribute__((nonnull, warn_unused_result))
2087
error_t bring_up_interface(const char *const interface,
2088
const float delay){
2089
error_t old_errno = errno;
2090
int ret;
2091
struct ifreq network;
2092
unsigned int if_index = if_nametoindex(interface);
2093
if(if_index == 0){
2094
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2095
errno = old_errno;
2096
return ENXIO;
2097
}
2098
2099
if(quit_now){
2100
errno = old_errno;
2101
return EINTR;
2102
}
2103
2104
if(not interface_is_up(interface)){
2105
error_t ret_errno = 0, ioctl_errno = 0;
2106
if(not get_flags(interface, &network)){
2107
ret_errno = errno;
2108
fprintf_plus(stderr, "Failed to get flags for interface "
2109
"\"%s\"\n", interface);
2110
errno = old_errno;
2111
return ret_errno;
2112
}
2113
network.ifr_flags |= IFF_UP; /* set flag */
2114
2115
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2116
if(sd == -1){
2117
ret_errno = errno;
2118
perror_plus("socket");
2119
errno = old_errno;
2120
return ret_errno;
2121
}
2122
2123
if(quit_now){
2124
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2125
if(ret == -1){
2126
perror_plus("close");
2127
}
2128
errno = old_errno;
2129
return EINTR;
2130
}
2131
2132
if(debug){
2133
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2134
interface);
2135
}
2136
2137
/* Raise privileges */
2138
ret_errno = raise_privileges();
2139
if(ret_errno != 0){
2140
errno = ret_errno;
2141
perror_plus("Failed to raise privileges");
2142
}
2143
2144
#ifdef __linux__
2145
int ret_linux;
2146
bool restore_loglevel = false;
2147
if(ret_errno == 0){
2148
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2149
messages about the network interface to mess up the prompt */
2150
ret_linux = klogctl(8, NULL, 5);
2151
if(ret_linux == -1){
2152
perror_plus("klogctl");
2153
} else {
2154
restore_loglevel = true;
2155
}
2156
}
2157
#endif /* __linux__ */
2158
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2159
ioctl_errno = errno;
2160
#ifdef __linux__
2161
if(restore_loglevel){
2162
ret_linux = klogctl(7, NULL, 0);
2163
if(ret_linux == -1){
2164
perror_plus("klogctl");
2165
}
2166
}
2167
#endif /* __linux__ */
2168
2169
/* If raise_privileges() succeeded above */
2170
if(ret_errno == 0){
2171
/* Lower privileges */
2172
ret_errno = lower_privileges();
2173
if(ret_errno != 0){
2174
errno = ret_errno;
2175
perror_plus("Failed to lower privileges");
2176
}
2177
}
2178
2179
/* Close the socket */
2180
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2181
if(ret == -1){
2182
perror_plus("close");
2183
}
2184
2185
if(ret_setflags == -1){
2186
errno = ioctl_errno;
2187
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2188
errno = old_errno;
2189
return ioctl_errno;
2190
}
2191
} else if(debug){
2192
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2193
interface);
2194
}
2195
2196
/* Sleep checking until interface is running.
2197
Check every 0.25s, up to total time of delay */
2198
for(int i=0; i < delay * 4; i++){
2199
if(interface_is_running(interface)){
2200
break;
2201
}
2202
struct timespec sleeptime = { .tv_nsec = 250000000 };
2203
ret = nanosleep(&sleeptime, NULL);
2204
if(ret == -1 and errno != EINTR){
2205
perror_plus("nanosleep");
2206
}
2207
}
2208
2209
errno = old_errno;
2210
return 0;
2211
}
2212
2213
__attribute__((nonnull, warn_unused_result))
2214
error_t take_down_interface(const char *const interface){
2215
error_t old_errno = errno;
2216
struct ifreq network;
2217
unsigned int if_index = if_nametoindex(interface);
2218
if(if_index == 0){
2219
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2220
errno = old_errno;
2221
return ENXIO;
2222
}
2223
if(interface_is_up(interface)){
2224
error_t ret_errno = 0, ioctl_errno = 0;
2225
if(not get_flags(interface, &network) and debug){
2226
ret_errno = errno;
2227
fprintf_plus(stderr, "Failed to get flags for interface "
2228
"\"%s\"\n", interface);
2229
errno = old_errno;
2230
return ret_errno;
2231
}
2232
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2233
2234
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2235
if(sd == -1){
2236
ret_errno = errno;
2237
perror_plus("socket");
2238
errno = old_errno;
2239
return ret_errno;
2240
}
2241
2242
if(debug){
2243
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2244
interface);
2245
}
2246
2247
/* Raise privileges */
2248
ret_errno = raise_privileges();
2249
if(ret_errno != 0){
2250
errno = ret_errno;
2251
perror_plus("Failed to raise privileges");
2252
}
2253
2254
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2255
ioctl_errno = errno;
2256
2257
/* If raise_privileges() succeeded above */
2258
if(ret_errno == 0){
2259
/* Lower privileges */
2260
ret_errno = lower_privileges();
2261
if(ret_errno != 0){
2262
errno = ret_errno;
2263
perror_plus("Failed to lower privileges");
2264
}
2265
}
2266
2267
/* Close the socket */
2268
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2269
if(ret == -1){
2270
perror_plus("close");
2271
}
2272
2273
if(ret_setflags == -1){
2274
errno = ioctl_errno;
2275
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2276
errno = old_errno;
2277
return ioctl_errno;
2278
}
2279
} else if(debug){
2280
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2281
interface);
2282
}
2283
2284
errno = old_errno;
2285
return 0;
2286
}
2287
2288
int main(int argc, char *argv[]){
2289
mandos_context mc = { .server = NULL, .dh_bits = 0,
2290
.priority = "SECURE256:!CTYPE-X.509:"
2291
"+CTYPE-OPENPGP:!RSA", .current_server = NULL,
2292
.interfaces = NULL, .interfaces_size = 0 };
2293
AvahiSServiceBrowser *sb = NULL;
2294
error_t ret_errno;
2295
int ret;
2296
intmax_t tmpmax;
751
2297
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
":!CTYPE-X.509:+CTYPE-OPENPGP" };
779
bool gnutls_initalized = false;
780
781
{
782
struct argp_option options[] = {
783
{ .name = "debug", .key = 128,
784
.doc = "Debug mode", .group = 3 },
785
{ .name = "connect", .key = 'c',
786
.arg = "IP",
787
.doc = "Connect directly to a sepcified mandos server",
788
.group = 1 },
789
{ .name = "interface", .key = 'i',
790
.arg = "INTERFACE",
791
.doc = "Interface that Avahi will conntect through",
792
.group = 1 },
793
{ .name = "keydir", .key = 'd',
794
.arg = "KEYDIR",
795
.doc = "Directory where the openpgp keyring is",
796
.group = 1 },
797
{ .name = "seckey", .key = 's',
798
.arg = "SECKEY",
799
.doc = "Secret openpgp key for gnutls authentication",
800
.group = 1 },
801
{ .name = "pubkey", .key = 'p',
802
.arg = "PUBKEY",
803
.doc = "Public openpgp key for gnutls authentication",
804
.group = 2 },
805
{ .name = "dh-bits", .key = 129,
806
.arg = "BITS",
807
.doc = "dh-bits to use in gnutls communication",
808
.group = 2 },
809
{ .name = "priority", .key = 130,
810
.arg = "PRIORITY",
811
.doc = "GNUTLS priority", .group = 1 },
812
{ .name = NULL }
813
};
814
815
816
error_t parse_opt (int key, char *arg,
817
struct argp_state *state) {
818
/* Get the INPUT argument from `argp_parse', which we know is
819
a pointer to our plugin list pointer. */
820
switch (key) {
821
case 128: /* --debug */
822
debug = true;
823
break;
824
case 'c': /* --connect */
825
connect_to = arg;
826
break;
827
case 'i': /* --interface */
828
interface = arg;
829
break;
830
case 'd': /* --keydir */
831
keydir = arg;
832
break;
833
case 's': /* --seckey */
834
seckeyname = arg;
835
break;
836
case 'p': /* --pubkey */
837
pubkeyname = arg;
838
break;
839
case 129: /* --dh-bits */
840
errno = 0;
841
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
842
if (errno){
843
perror("strtol");
844
exit(EXIT_FAILURE);
845
}
846
break;
847
case 130: /* --priority */
848
mc.priority = arg;
849
break;
850
case ARGP_KEY_ARG:
851
argp_usage (state);
852
case ARGP_KEY_END:
853
break;
854
default:
855
return ARGP_ERR_UNKNOWN;
856
}
857
return 0;
858
}
859
860
struct argp argp = { .options = options, .parser = parse_opt,
861
.args_doc = "",
862
.doc = "Mandos client -- Get and decrypt"
863
" passwords from mandos server" };
864
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
865
if (ret == ARGP_ERR_UNKNOWN){
866
fprintf(stderr, "Unknown error while parsing arguments\n");
867
exitcode = EXIT_FAILURE;
868
goto end;
869
}
870
}
871
872
pubkeyfilename = combinepath(keydir, pubkeyname);
873
if (pubkeyfilename == NULL){
874
perror("combinepath");
875
exitcode = EXIT_FAILURE;
876
goto end;
877
}
878
879
seckeyfilename = combinepath(keydir, seckeyname);
880
if (seckeyfilename == NULL){
881
perror("combinepath");
882
exitcode = EXIT_FAILURE;
883
goto end;
884
}
885
886
ret = init_gnutls_global(&mc, pubkeyfilename, seckeyfilename);
887
if (ret == -1){
888
fprintf(stderr, "init_gnutls_global failed\n");
889
exitcode = EXIT_FAILURE;
890
goto end;
891
} else {
892
gnutls_initalized = true;
893
}
894
895
/* If the interface is down, bring it up */
896
{
897
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
898
if(sd < 0) {
899
perror("socket");
900
exitcode = EXIT_FAILURE;
901
goto end;
902
}
903
strcpy(network.ifr_name, interface);
904
ret = ioctl(sd, SIOCGIFFLAGS, &network);
905
if(ret == -1){
906
perror("ioctl SIOCGIFFLAGS");
907
exitcode = EXIT_FAILURE;
908
goto end;
909
}
910
if((network.ifr_flags & IFF_UP) == 0){
911
network.ifr_flags |= IFF_UP;
912
ret = ioctl(sd, SIOCSIFFLAGS, &network);
913
if(ret == -1){
914
perror("ioctl SIOCSIFFLAGS");
915
exitcode = EXIT_FAILURE;
916
goto end;
917
}
918
}
919
close(sd);
920
}
921
922
uid = getuid();
923
gid = getgid();
924
925
ret = setuid(uid);
926
if (ret == -1){
927
perror("setuid");
928
}
929
930
setgid(gid);
931
if (ret == -1){
932
perror("setgid");
933
}
934
935
if_index = (AvahiIfIndex) if_nametoindex(interface);
936
if(if_index == 0){
937
fprintf(stderr, "No such interface: \"%s\"\n", interface);
938
exit(EXIT_FAILURE);
939
}
940
941
if(connect_to != NULL){
942
/* Connect directly, do not use Zeroconf */
943
/* (Mainly meant for debugging) */
944
char *address = strrchr(connect_to, ':');
945
if(address == NULL){
946
fprintf(stderr, "No colon in address\n");
947
exitcode = EXIT_FAILURE;
948
goto end;
949
}
2298
int exitcode = EXIT_SUCCESS;
2299
char *interfaces_to_take_down = NULL;
2300
size_t interfaces_to_take_down_size = 0;
2301
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2302
char old_tempdir[] = "/tmp/mandosXXXXXX";
2303
char *tempdir = NULL;
2304
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2305
const char *seckey = PATHDIR "/" SECKEY;
2306
const char *pubkey = PATHDIR "/" PUBKEY;
2307
const char *dh_params_file = NULL;
2308
char *interfaces_hooks = NULL;
2309
2310
bool gnutls_initialized = false;
2311
bool gpgme_initialized = false;
2312
float delay = 2.5f;
2313
double retry_interval = 10; /* 10s between trying a server and
2314
retrying the same server again */
2315
2316
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
2317
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
2318
2319
uid = getuid();
2320
gid = getgid();
2321
2322
/* Lower any group privileges we might have, just to be safe */
2323
errno = 0;
2324
ret = setgid(gid);
2325
if(ret == -1){
2326
perror_plus("setgid");
2327
}
2328
2329
/* Lower user privileges (temporarily) */
2330
errno = 0;
2331
ret = seteuid(uid);
2332
if(ret == -1){
2333
perror_plus("seteuid");
2334
}
2335
2336
if(quit_now){
2337
goto end;
2338
}
2339
2340
{
2341
struct argp_option options[] = {
2342
{ .name = "debug", .key = 128,
2343
.doc = "Debug mode", .group = 3 },
2344
{ .name = "connect", .key = 'c',
2345
.arg = "ADDRESS:PORT",
2346
.doc = "Connect directly to a specific Mandos server",
2347
.group = 1 },
2348
{ .name = "interface", .key = 'i',
2349
.arg = "NAME",
2350
.doc = "Network interface that will be used to search for"
2351
" Mandos servers",
2352
.group = 1 },
2353
{ .name = "seckey", .key = 's',
2354
.arg = "FILE",
2355
.doc = "OpenPGP secret key file base name",
2356
.group = 1 },
2357
{ .name = "pubkey", .key = 'p',
2358
.arg = "FILE",
2359
.doc = "OpenPGP public key file base name",
2360
.group = 2 },
2361
{ .name = "dh-bits", .key = 129,
2362
.arg = "BITS",
2363
.doc = "Bit length of the prime number used in the"
2364
" Diffie-Hellman key exchange",
2365
.group = 2 },
2366
{ .name = "dh-params", .key = 134,
2367
.arg = "FILE",
2368
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2369
" for the Diffie-Hellman key exchange",
2370
.group = 2 },
2371
{ .name = "priority", .key = 130,
2372
.arg = "STRING",
2373
.doc = "GnuTLS priority string for the TLS handshake",
2374
.group = 1 },
2375
{ .name = "delay", .key = 131,
2376
.arg = "SECONDS",
2377
.doc = "Maximum delay to wait for interface startup",
2378
.group = 2 },
2379
{ .name = "retry", .key = 132,
2380
.arg = "SECONDS",
2381
.doc = "Retry interval used when denied by the Mandos server",
2382
.group = 2 },
2383
{ .name = "network-hook-dir", .key = 133,
2384
.arg = "DIR",
2385
.doc = "Directory where network hooks are located",
2386
.group = 2 },
2387
/*
2388
* These reproduce what we would get without ARGP_NO_HELP
2389
*/
2390
{ .name = "help", .key = '?',
2391
.doc = "Give this help list", .group = -1 },
2392
{ .name = "usage", .key = -3,
2393
.doc = "Give a short usage message", .group = -1 },
2394
{ .name = "version", .key = 'V',
2395
.doc = "Print program version", .group = -1 },
2396
{ .name = NULL }
2397
};
2398
2399
error_t parse_opt(int key, char *arg,
2400
struct argp_state *state){
950
2401
errno = 0;
951
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
952
if(errno){
953
perror("Bad port number");
954
exitcode = EXIT_FAILURE;
2402
switch(key){
2403
case 128: /* --debug */
2404
debug = true;
2405
break;
2406
case 'c': /* --connect */
2407
connect_to = arg;
2408
break;
2409
case 'i': /* --interface */
2410
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2411
arg, (int)',');
2412
if(ret_errno != 0){
2413
argp_error(state, "%s", strerror(ret_errno));
2414
}
2415
break;
2416
case 's': /* --seckey */
2417
seckey = arg;
2418
break;
2419
case 'p': /* --pubkey */
2420
pubkey = arg;
2421
break;
2422
case 129: /* --dh-bits */
2423
errno = 0;
2424
tmpmax = strtoimax(arg, &tmp, 10);
2425
if(errno != 0 or tmp == arg or *tmp != '\0'
2426
or tmpmax != (typeof(mc.dh_bits))tmpmax){
2427
argp_error(state, "Bad number of DH bits");
2428
}
2429
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2430
break;
2431
case 134: /* --dh-params */
2432
dh_params_file = arg;
2433
break;
2434
case 130: /* --priority */
2435
mc.priority = arg;
2436
break;
2437
case 131: /* --delay */
2438
errno = 0;
2439
delay = strtof(arg, &tmp);
2440
if(errno != 0 or tmp == arg or *tmp != '\0'){
2441
argp_error(state, "Bad delay");
2442
}
2443
case 132: /* --retry */
2444
errno = 0;
2445
retry_interval = strtod(arg, &tmp);
2446
if(errno != 0 or tmp == arg or *tmp != '\0'
2447
or (retry_interval * 1000) > INT_MAX
2448
or retry_interval < 0){
2449
argp_error(state, "Bad retry interval");
2450
}
2451
break;
2452
case 133: /* --network-hook-dir */
2453
hookdir = arg;
2454
break;
2455
/*
2456
* These reproduce what we would get without ARGP_NO_HELP
2457
*/
2458
case '?': /* --help */
2459
argp_state_help(state, state->out_stream,
2460
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2461
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2462
case -3: /* --usage */
2463
argp_state_help(state, state->out_stream,
2464
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2465
case 'V': /* --version */
2466
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2467
exit(argp_err_exit_status);
2468
break;
2469
default:
2470
return ARGP_ERR_UNKNOWN;
2471
}
2472
return errno;
2473
}
2474
2475
struct argp argp = { .options = options, .parser = parse_opt,
2476
.args_doc = "",
2477
.doc = "Mandos client -- Get and decrypt"
2478
" passwords from a Mandos server" };
2479
ret = argp_parse(&argp, argc, argv,
2480
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2481
switch(ret){
2482
case 0:
2483
break;
2484
case ENOMEM:
2485
default:
2486
errno = ret;
2487
perror_plus("argp_parse");
2488
exitcode = EX_OSERR;
2489
goto end;
2490
case EINVAL:
2491
exitcode = EX_USAGE;
2492
goto end;
2493
}
2494
}
2495
2496
{
2497
/* Work around Debian bug #633582:
2498
<http://bugs.debian.org/633582> */
2499
2500
/* Re-raise privileges */
2501
ret_errno = raise_privileges();
2502
if(ret_errno != 0){
2503
errno = ret_errno;
2504
perror_plus("Failed to raise privileges");
2505
} else {
2506
struct stat st;
2507
2508
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2509
int seckey_fd = open(seckey, O_RDONLY);
2510
if(seckey_fd == -1){
2511
perror_plus("open");
2512
} else {
2513
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2514
if(ret == -1){
2515
perror_plus("fstat");
2516
} else {
2517
if(S_ISREG(st.st_mode)
2518
and st.st_uid == 0 and st.st_gid == 0){
2519
ret = fchown(seckey_fd, uid, gid);
2520
if(ret == -1){
2521
perror_plus("fchown");
2522
}
2523
}
2524
}
2525
TEMP_FAILURE_RETRY(close(seckey_fd));
2526
}
2527
}
2528
2529
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2530
int pubkey_fd = open(pubkey, O_RDONLY);
2531
if(pubkey_fd == -1){
2532
perror_plus("open");
2533
} else {
2534
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2535
if(ret == -1){
2536
perror_plus("fstat");
2537
} else {
2538
if(S_ISREG(st.st_mode)
2539
and st.st_uid == 0 and st.st_gid == 0){
2540
ret = fchown(pubkey_fd, uid, gid);
2541
if(ret == -1){
2542
perror_plus("fchown");
2543
}
2544
}
2545
}
2546
TEMP_FAILURE_RETRY(close(pubkey_fd));
2547
}
2548
}
2549
2550
if(strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2551
int dhparams_fd = open(dh_params_file, O_RDONLY);
2552
if(dhparams_fd == -1){
2553
perror_plus("open");
2554
} else {
2555
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2556
if(ret == -1){
2557
perror_plus("fstat");
2558
} else {
2559
if(S_ISREG(st.st_mode)
2560
and st.st_uid == 0 and st.st_gid == 0){
2561
ret = fchown(dhparams_fd, uid, gid);
2562
if(ret == -1){
2563
perror_plus("fchown");
2564
}
2565
}
2566
}
2567
TEMP_FAILURE_RETRY(close(dhparams_fd));
2568
}
2569
}
2570
2571
/* Lower privileges */
2572
ret_errno = lower_privileges();
2573
if(ret_errno != 0){
2574
errno = ret_errno;
2575
perror_plus("Failed to lower privileges");
2576
}
2577
}
2578
}
2579
2580
/* Remove invalid interface names (except "none") */
2581
{
2582
char *interface = NULL;
2583
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2584
interface))){
2585
if(strcmp(interface, "none") != 0
2586
and if_nametoindex(interface) == 0){
2587
if(interface[0] != '\0'){
2588
fprintf_plus(stderr, "Not using nonexisting interface"
2589
" \"%s\"\n", interface);
2590
}
2591
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2592
interface = NULL;
2593
}
2594
}
2595
}
2596
2597
/* Run network hooks */
2598
{
2599
if(mc.interfaces != NULL){
2600
interfaces_hooks = malloc(mc.interfaces_size);
2601
if(interfaces_hooks == NULL){
2602
perror_plus("malloc");
955
2603
goto end;
956
2604
}
957
*address = '\0';
958
address = connect_to;
959
ret = start_mandos_communication(address, port, if_index, &mc);
960
if(ret < 0){
961
exitcode = EXIT_FAILURE;
962
} else {
963
exitcode = EXIT_SUCCESS;
964
}
965
goto end;
966
}
967
968
if (not debug){
969
avahi_set_log_function(empty_log);
970
}
971
972
/* Initialize the pseudo-RNG for Avahi */
973
srand((unsigned int) time(NULL));
974
975
/* Allocate main Avahi loop object */
976
mc.simple_poll = avahi_simple_poll_new();
977
if (mc.simple_poll == NULL) {
978
fprintf(stderr, "Avahi: Failed to create simple poll"
979
" object.\n");
980
exitcode = EXIT_FAILURE;
981
goto end;
982
}
983
984
{
985
AvahiServerConfig config;
986
/* Do not publish any local Zeroconf records */
987
avahi_server_config_init(&config);
988
config.publish_hinfo = 0;
989
config.publish_addresses = 0;
990
config.publish_workstation = 0;
991
config.publish_domain = 0;
992
993
/* Allocate a new server */
994
mc.server = avahi_server_new(avahi_simple_poll_get
995
(mc.simple_poll), &config, NULL,
996
NULL, &error);
997
998
/* Free the Avahi configuration data */
999
avahi_server_config_free(&config);
1000
}
1001
1002
/* Check if creating the Avahi server object succeeded */
1003
if (mc.server == NULL) {
1004
fprintf(stderr, "Failed to create Avahi server: %s\n",
1005
avahi_strerror(error));
1006
exitcode = EXIT_FAILURE;
1007
goto end;
1008
}
1009
1010
/* Create the Avahi service browser */
1011
sb = avahi_s_service_browser_new(mc.server, if_index,
1012
AVAHI_PROTO_INET6,
1013
"_mandos._tcp", NULL, 0,
1014
browse_callback, &mc);
1015
if (sb == NULL) {
1016
fprintf(stderr, "Failed to create service browser: %s\n",
1017
avahi_strerror(avahi_server_errno(mc.server)));
1018
exitcode = EXIT_FAILURE;
1019
goto end;
1020
}
1021
1022
/* Run the main loop */
1023
1024
if (debug){
1025
fprintf(stderr, "Starting Avahi loop search\n");
1026
}
1027
1028
avahi_simple_poll_loop(mc.simple_poll);
1029
2605
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2606
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2607
}
2608
run_network_hooks("start", interfaces_hooks != NULL ?
2609
interfaces_hooks : "", delay);
2610
}
2611
2612
if(not debug){
2613
avahi_set_log_function(empty_log);
2614
}
2615
2616
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2617
from the signal handler */
2618
/* Initialize the pseudo-RNG for Avahi */
2619
srand((unsigned int) time(NULL));
2620
simple_poll = avahi_simple_poll_new();
2621
if(simple_poll == NULL){
2622
fprintf_plus(stderr,
2623
"Avahi: Failed to create simple poll object.\n");
2624
exitcode = EX_UNAVAILABLE;
2625
goto end;
2626
}
2627
2628
sigemptyset(&sigterm_action.sa_mask);
2629
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2630
if(ret == -1){
2631
perror_plus("sigaddset");
2632
exitcode = EX_OSERR;
2633
goto end;
2634
}
2635
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2636
if(ret == -1){
2637
perror_plus("sigaddset");
2638
exitcode = EX_OSERR;
2639
goto end;
2640
}
2641
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2642
if(ret == -1){
2643
perror_plus("sigaddset");
2644
exitcode = EX_OSERR;
2645
goto end;
2646
}
2647
/* Need to check if the handler is SIG_IGN before handling:
2648
| [[info:libc:Initial Signal Actions]] |
2649
| [[info:libc:Basic Signal Handling]] |
2650
*/
2651
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2652
if(ret == -1){
2653
perror_plus("sigaction");
2654
return EX_OSERR;
2655
}
2656
if(old_sigterm_action.sa_handler != SIG_IGN){
2657
ret = sigaction(SIGINT, &sigterm_action, NULL);
2658
if(ret == -1){
2659
perror_plus("sigaction");
2660
exitcode = EX_OSERR;
2661
goto end;
2662
}
2663
}
2664
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2665
if(ret == -1){
2666
perror_plus("sigaction");
2667
return EX_OSERR;
2668
}
2669
if(old_sigterm_action.sa_handler != SIG_IGN){
2670
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2671
if(ret == -1){
2672
perror_plus("sigaction");
2673
exitcode = EX_OSERR;
2674
goto end;
2675
}
2676
}
2677
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2678
if(ret == -1){
2679
perror_plus("sigaction");
2680
return EX_OSERR;
2681
}
2682
if(old_sigterm_action.sa_handler != SIG_IGN){
2683
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2684
if(ret == -1){
2685
perror_plus("sigaction");
2686
exitcode = EX_OSERR;
2687
goto end;
2688
}
2689
}
2690
2691
/* If no interfaces were specified, make a list */
2692
if(mc.interfaces == NULL){
2693
struct dirent **direntries = NULL;
2694
/* Look for any good interfaces */
2695
ret = scandir(sys_class_net, &direntries, good_interface,
2696
alphasort);
2697
if(ret >= 1){
2698
/* Add all found interfaces to interfaces list */
2699
for(int i = 0; i < ret; ++i){
2700
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2701
direntries[i]->d_name);
2702
if(ret_errno != 0){
2703
errno = ret_errno;
2704
perror_plus("argz_add");
2705
free(direntries[i]);
2706
continue;
2707
}
2708
if(debug){
2709
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2710
direntries[i]->d_name);
2711
}
2712
free(direntries[i]);
2713
}
2714
free(direntries);
2715
} else {
2716
if(ret == 0){
2717
free(direntries);
2718
}
2719
fprintf_plus(stderr, "Could not find a network interface\n");
2720
exitcode = EXIT_FAILURE;
2721
goto end;
2722
}
2723
}
2724
2725
/* Bring up interfaces which are down, and remove any "none"s */
2726
{
2727
char *interface = NULL;
2728
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2729
interface))){
2730
/* If interface name is "none", stop bringing up interfaces.
2731
Also remove all instances of "none" from the list */
2732
if(strcmp(interface, "none") == 0){
2733
argz_delete(&mc.interfaces, &mc.interfaces_size,
2734
interface);
2735
interface = NULL;
2736
while((interface = argz_next(mc.interfaces,
2737
mc.interfaces_size, interface))){
2738
if(strcmp(interface, "none") == 0){
2739
argz_delete(&mc.interfaces, &mc.interfaces_size,
2740
interface);
2741
interface = NULL;
2742
}
2743
}
2744
break;
2745
}
2746
bool interface_was_up = interface_is_up(interface);
2747
errno = bring_up_interface(interface, delay);
2748
if(not interface_was_up){
2749
if(errno != 0){
2750
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2751
" %s\n", interface, strerror(errno));
2752
} else {
2753
errno = argz_add(&interfaces_to_take_down,
2754
&interfaces_to_take_down_size,
2755
interface);
2756
if(errno != 0){
2757
perror_plus("argz_add");
2758
}
2759
}
2760
}
2761
}
2762
if(debug and (interfaces_to_take_down == NULL)){
2763
fprintf_plus(stderr, "No interfaces were brought up\n");
2764
}
2765
}
2766
2767
/* If we only got one interface, explicitly use only that one */
2768
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2769
if(debug){
2770
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2771
mc.interfaces);
2772
}
2773
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2774
}
2775
2776
if(quit_now){
2777
goto end;
2778
}
2779
2780
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2781
if(ret == -1){
2782
fprintf_plus(stderr, "init_gnutls_global failed\n");
2783
exitcode = EX_UNAVAILABLE;
2784
goto end;
2785
} else {
2786
gnutls_initialized = true;
2787
}
2788
2789
if(quit_now){
2790
goto end;
2791
}
2792
2793
/* Try /run/tmp before /tmp */
2794
tempdir = mkdtemp(run_tempdir);
2795
if(tempdir == NULL and errno == ENOENT){
2796
if(debug){
2797
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2798
run_tempdir, old_tempdir);
2799
}
2800
tempdir = mkdtemp(old_tempdir);
2801
}
2802
if(tempdir == NULL){
2803
perror_plus("mkdtemp");
2804
goto end;
2805
}
2806
2807
if(quit_now){
2808
goto end;
2809
}
2810
2811
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2812
fprintf_plus(stderr, "init_gpgme failed\n");
2813
exitcode = EX_UNAVAILABLE;
2814
goto end;
2815
} else {
2816
gpgme_initialized = true;
2817
}
2818
2819
if(quit_now){
2820
goto end;
2821
}
2822
2823
if(connect_to != NULL){
2824
/* Connect directly, do not use Zeroconf */
2825
/* (Mainly meant for debugging) */
2826
char *address = strrchr(connect_to, ':');
2827
2828
if(address == NULL){
2829
fprintf_plus(stderr, "No colon in address\n");
2830
exitcode = EX_USAGE;
2831
goto end;
2832
}
2833
2834
if(quit_now){
2835
goto end;
2836
}
2837
2838
in_port_t port;
2839
errno = 0;
2840
tmpmax = strtoimax(address+1, &tmp, 10);
2841
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2842
or tmpmax != (in_port_t)tmpmax){
2843
fprintf_plus(stderr, "Bad port number\n");
2844
exitcode = EX_USAGE;
2845
goto end;
2846
}
2847
2848
if(quit_now){
2849
goto end;
2850
}
2851
2852
port = (in_port_t)tmpmax;
2853
*address = '\0';
2854
/* Colon in address indicates IPv6 */
2855
int af;
2856
if(strchr(connect_to, ':') != NULL){
2857
af = AF_INET6;
2858
/* Accept [] around IPv6 address - see RFC 5952 */
2859
if(connect_to[0] == '[' and address[-1] == ']')
2860
{
2861
connect_to++;
2862
address[-1] = '\0';
2863
}
2864
} else {
2865
af = AF_INET;
2866
}
2867
address = connect_to;
2868
2869
if(quit_now){
2870
goto end;
2871
}
2872
2873
while(not quit_now){
2874
ret = start_mandos_communication(address, port, if_index, af,
2875
&mc);
2876
if(quit_now or ret == 0){
2877
break;
2878
}
2879
if(debug){
2880
fprintf_plus(stderr, "Retrying in %d seconds\n",
2881
(int)retry_interval);
2882
}
2883
sleep((unsigned int)retry_interval);
2884
}
2885
2886
if(not quit_now){
2887
exitcode = EXIT_SUCCESS;
2888
}
2889
2890
goto end;
2891
}
2892
2893
if(quit_now){
2894
goto end;
2895
}
2896
2897
{
2898
AvahiServerConfig config;
2899
/* Do not publish any local Zeroconf records */
2900
avahi_server_config_init(&config);
2901
config.publish_hinfo = 0;
2902
config.publish_addresses = 0;
2903
config.publish_workstation = 0;
2904
config.publish_domain = 0;
2905
2906
/* Allocate a new server */
2907
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2908
&config, NULL, NULL, &ret_errno);
2909
2910
/* Free the Avahi configuration data */
2911
avahi_server_config_free(&config);
2912
}
2913
2914
/* Check if creating the Avahi server object succeeded */
2915
if(mc.server == NULL){
2916
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2917
avahi_strerror(ret_errno));
2918
exitcode = EX_UNAVAILABLE;
2919
goto end;
2920
}
2921
2922
if(quit_now){
2923
goto end;
2924
}
2925
2926
/* Create the Avahi service browser */
2927
sb = avahi_s_service_browser_new(mc.server, if_index,
2928
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2929
NULL, 0, browse_callback,
2930
(void *)&mc);
2931
if(sb == NULL){
2932
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2933
avahi_strerror(avahi_server_errno(mc.server)));
2934
exitcode = EX_UNAVAILABLE;
2935
goto end;
2936
}
2937
2938
if(quit_now){
2939
goto end;
2940
}
2941
2942
/* Run the main loop */
2943
2944
if(debug){
2945
fprintf_plus(stderr, "Starting Avahi loop search\n");
2946
}
2947
2948
ret = avahi_loop_with_timeout(simple_poll,
2949
(int)(retry_interval * 1000), &mc);
2950
if(debug){
2951
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2952
(ret == 0) ? "successfully" : "with error");
2953
}
2954
1030
2955
end:
1031
1032
if (debug){
1033
fprintf(stderr, "%s exiting\n", argv[0]);
1034
}
1035
1036
/* Cleanup things */
1037
if (sb != NULL)
1038
avahi_s_service_browser_free(sb);
1039
1040
if (mc.server != NULL)
1041
avahi_server_free(mc.server);
1042
1043
if (mc.simple_poll != NULL)
1044
avahi_simple_poll_free(mc.simple_poll);
1045
free(pubkeyfilename);
1046
free(seckeyfilename);
1047
1048
if (gnutls_initalized){
1049
gnutls_certificate_free_credentials(mc.cred);
1050
gnutls_global_deinit ();
1051
}
1052
1053
return exitcode;
2956
2957
if(debug){
2958
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2959
}
2960
2961
/* Cleanup things */
2962
free(mc.interfaces);
2963
2964
if(sb != NULL)
2965
avahi_s_service_browser_free(sb);
2966
2967
if(mc.server != NULL)
2968
avahi_server_free(mc.server);
2969
2970
if(simple_poll != NULL)
2971
avahi_simple_poll_free(simple_poll);
2972
2973
if(gnutls_initialized){
2974
gnutls_certificate_free_credentials(mc.cred);
2975
gnutls_global_deinit();
2976
gnutls_dh_params_deinit(mc.dh_params);
2977
}
2978
2979
if(gpgme_initialized){
2980
gpgme_release(mc.ctx);
2981
}
2982
2983
/* Cleans up the circular linked list of Mandos servers the client
2984
has seen */
2985
if(mc.current_server != NULL){
2986
mc.current_server->prev->next = NULL;
2987
while(mc.current_server != NULL){
2988
server *next = mc.current_server->next;
2989
#ifdef __GNUC__
2990
#pragma GCC diagnostic push
2991
#pragma GCC diagnostic ignored "-Wcast-qual"
2992
#endif
2993
free((char *)(mc.current_server->ip));
2994
#ifdef __GNUC__
2995
#pragma GCC diagnostic pop
2996
#endif
2997
free(mc.current_server);
2998
mc.current_server = next;
2999
}
3000
}
3001
3002
/* Re-raise privileges */
3003
{
3004
ret_errno = raise_privileges();
3005
if(ret_errno != 0){
3006
errno = ret_errno;
3007
perror_plus("Failed to raise privileges");
3008
} else {
3009
3010
/* Run network hooks */
3011
run_network_hooks("stop", interfaces_hooks != NULL ?
3012
interfaces_hooks : "", delay);
3013
3014
/* Take down the network interfaces which were brought up */
3015
{
3016
char *interface = NULL;
3017
while((interface=argz_next(interfaces_to_take_down,
3018
interfaces_to_take_down_size,
3019
interface))){
3020
ret_errno = take_down_interface(interface);
3021
if(ret_errno != 0){
3022
errno = ret_errno;
3023
perror_plus("Failed to take down interface");
3024
}
3025
}
3026
if(debug and (interfaces_to_take_down == NULL)){
3027
fprintf_plus(stderr, "No interfaces needed to be taken"
3028
" down\n");
3029
}
3030
}
3031
}
3032
3033
ret_errno = lower_privileges_permanently();
3034
if(ret_errno != 0){
3035
errno = ret_errno;
3036
perror_plus("Failed to lower privileges permanently");
3037
}
3038
}
3039
3040
free(interfaces_to_take_down);
3041
free(interfaces_hooks);
3042
3043
/* Removes the GPGME temp directory and all files inside */
3044
if(tempdir != NULL){
3045
struct dirent **direntries = NULL;
3046
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
3047
| O_NOFOLLOW
3048
| O_DIRECTORY
3049
| O_PATH));
3050
if(tempdir_fd == -1){
3051
perror_plus("open");
3052
} else {
3053
#ifdef __GLIBC__
3054
#if __GLIBC_PREREQ(2, 15)
3055
int numentries = scandirat(tempdir_fd, ".", &direntries,
3056
notdotentries, alphasort);
3057
#else /* not __GLIBC_PREREQ(2, 15) */
3058
int numentries = scandir(tempdir, &direntries, notdotentries,
3059
alphasort);
3060
#endif /* not __GLIBC_PREREQ(2, 15) */
3061
#else /* not __GLIBC__ */
3062
int numentries = scandir(tempdir, &direntries, notdotentries,
3063
alphasort);
3064
#endif /* not __GLIBC__ */
3065
if(numentries >= 0){
3066
for(int i = 0; i < numentries; i++){
3067
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
3068
if(ret == -1){
3069
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
3070
" \"%s\", 0): %s\n", tempdir,
3071
direntries[i]->d_name, strerror(errno));
3072
}
3073
free(direntries[i]);
3074
}
3075
3076
/* need to clean even if 0 because man page doesn't specify */
3077
free(direntries);
3078
if(numentries == -1){
3079
perror_plus("scandir");
3080
}
3081
ret = rmdir(tempdir);
3082
if(ret == -1 and errno != ENOENT){
3083
perror_plus("rmdir");
3084
}
3085
}
3086
TEMP_FAILURE_RETRY(close(tempdir_fd));
3087
}
3088
}
3089
3090
if(quit_now){
3091
sigemptyset(&old_sigterm_action.sa_mask);
3092
old_sigterm_action.sa_handler = SIG_DFL;
3093
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
3094
&old_sigterm_action,
3095
NULL));
3096
if(ret == -1){
3097
perror_plus("sigaction");
3098
}
3099
do {
3100
ret = raise(signal_received);
3101
} while(ret != 0 and errno == EINTR);
3102
if(ret != 0){
3103
perror_plus("raise");
3104
abort();
3105
}
3106
TEMP_FAILURE_RETRY(pause());
3107
}
3108
3109
return exitcode;
1054
3110
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0