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- Committer: Teddy Hogeborn
- Date: 2009-10-24 19:17:52 UTC
- Revision ID: teddy@fukt.bsnet.se-20091024191752-7g6xlf6wpp2pdexb
Convert some programs to use the exit codes from <sysexits.h>. Change
all programs using the "argp" parsing functions to use them correctly;
checking return value, using argp_error() to report parse errors etc.
* plugin-runner.c: Use <sysexits.h> exit codes. Always use fallback,
even on option errors, except for "--help", etc.
(getplugin): Make sure "errno" is set correctly on return.
(main): Declare our own "--help", "--usage", and "--version"
options which do not cause the fallback to be invoked.
In all other options, use fallback on any error.
(parse_opt, parse_opt_config_file): Reset errno at start and return
errno. No need to check "arg"
for NULL. New "--help",
"--usage", and "--version"
options.
(parse_opt): Accept empty string as global option. Do not print
errors which will be detected and reported later. Do
"argp_error()" on parse error or empty plugin names.
* plugins.d/mandos-client.c: Use <sysexits.h> exit codes. Do not
return successful exit code on "--help",
etc. since this would give the wrong
message to "plugin-runner".
(main): Declare our own "--help", "--usage", and "--version"
options which do not return a successful exit code.
(parse_opt): Reset errno at start and return errno. Do
"argp_error()" on parse errors. New "--help",
"--usage", and "--version" options.
* plugins.d/password-prompt.c: Use exit codes from <sysexits.h>. Do
not return successful exit code on
"--help", etc. since this would give
the wrong message to "plugin-runner".
(main): Declare our own "--help", "--usage", and "--version" options
which do not return a successful exit code. Do
close(STDOUT_FILENO) after writing to check its return code.
(parse_opt): Reset errno at start and return errno.
all programs using the "argp" parsing functions to use them correctly;
checking return value, using argp_error() to report parse errors etc.
* plugin-runner.c: Use <sysexits.h> exit codes. Always use fallback,
even on option errors, except for "--help", etc.
(getplugin): Make sure "errno" is set correctly on return.
(main): Declare our own "--help", "--usage", and "--version"
options which do not cause the fallback to be invoked.
In all other options, use fallback on any error.
(parse_opt, parse_opt_config_file): Reset errno at start and return
errno. No need to check "arg"
for NULL. New "--help",
"--usage", and "--version"
options.
(parse_opt): Accept empty string as global option. Do not print
errors which will be detected and reported later. Do
"argp_error()" on parse error or empty plugin names.
* plugins.d/mandos-client.c: Use <sysexits.h> exit codes. Do not
return successful exit code on "--help",
etc. since this would give the wrong
message to "plugin-runner".
(main): Declare our own "--help", "--usage", and "--version"
options which do not return a successful exit code.
(parse_opt): Reset errno at start and return errno. Do
"argp_error()" on parse errors. New "--help",
"--usage", and "--version" options.
* plugins.d/password-prompt.c: Use exit codes from <sysexits.h>. Do
not return successful exit code on
"--help", etc. since this would give
the wrong message to "plugin-runner".
(main): Declare our own "--help", "--usage", and "--version" options
which do not return a successful exit code. Do
close(STDOUT_FILENO) after writing to check its return code.
(parse_opt): Reset errno at start and return errno.
- files added:
- .bzr-builddeb
- debian
- debian/po
- files removed:
- ca.pem
- files renamed:
- server.py => mandos
- server.conf => mandos.conf
- plugbasedclient.c => plugin-runner.c
- plugins.d/mandosclient.c => plugins.d/mandos-client.c
- plugins.d/passprompt.c => plugins.d/password-prompt.c
- files modified:
- Makefile
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 © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 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 <https://www.fukt.bsnet.se/~belorn/> and
29
* <https://www.fukt.bsnet.se/~teddy/>.
29
* Contact the authors at <mandos@fukt.bsnet.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
33
34
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
34
37
#define _FILE_OFFSET_BITS 64
35
36
#include <stdio.h>
37
#include <assert.h>
38
#include <stdlib.h>
39
#include <time.h>
40
#include <net/if.h> /* if_nametoindex */
41
38
#endif
39
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof(), abort() */
48
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open() */
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
*/
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
SIOCSIFFLAGS, if_indextoname(),
69
if_nametoindex(), IF_NAMESIZE */
70
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
72
*/
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
getuid(), getgid(), seteuid(),
75
setgid(), pause() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
77
#include <iso646.h> /* not, or, and */
78
#include <argp.h> /* struct argp_option, error_t, struct
79
argp_state, struct argp,
80
argp_parse(), ARGP_KEY_ARG,
81
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
82
#include <signal.h> /* sigemptyset(), sigaddset(),
83
sigaction(), SIGTERM, sig_atomic_t,
84
raise() */
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE */
86
87
#ifdef __linux__
88
#include <sys/klog.h> /* klogctl() */
89
#endif /* __linux__ */
90
91
/* Avahi */
92
/* All Avahi types, constants and functions
93
Avahi*, avahi_*,
94
AVAHI_* */
42
95
#include <avahi-core/core.h>
43
96
#include <avahi-core/lookup.h>
44
97
#include <avahi-core/log.h>
46
99
#include <avahi-common/malloc.h>
47
100
#include <avahi-common/error.h>
48
101
49
//mandos client part
50
#include <sys/types.h> /* socket(), inet_pton() */
51
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
52
struct in6_addr, inet_pton() */
53
#include <gnutls/gnutls.h> /* All GnuTLS stuff */
54
#include <gnutls/openpgp.h> /* GnuTLS with openpgp stuff */
55
56
#include <unistd.h> /* close() */
57
#include <netinet/in.h>
58
#include <stdbool.h> /* true */
59
#include <string.h> /* memset */
60
#include <arpa/inet.h> /* inet_pton() */
61
#include <iso646.h> /* not */
62
63
// gpgme
64
#include <errno.h> /* perror() */
65
#include <gpgme.h>
66
67
// getopt long
68
#include <getopt.h>
69
70
#ifndef CERT_ROOT
71
#define CERT_ROOT "/conf/conf.d/cryptkeyreq/"
72
#endif
73
#define CERTFILE CERT_ROOT "openpgp-client.txt"
74
#define KEYFILE CERT_ROOT "openpgp-client-key.txt"
102
/* GnuTLS */
103
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
104
functions:
105
gnutls_*
106
init_gnutls_session(),
107
GNUTLS_* */
108
#include <gnutls/openpgp.h>
109
/* gnutls_certificate_set_openpgp_key_file(),
110
GNUTLS_OPENPGP_FMT_BASE64 */
111
112
/* GPGME */
113
#include <gpgme.h> /* All GPGME types, constants and
114
functions:
115
gpgme_*
116
GPGME_PROTOCOL_OpenPGP,
117
GPG_ERR_NO_* */
118
75
119
#define BUFFER_SIZE 256
76
#define DH_BITS 1024
120
121
#define PATHDIR "/conf/conf.d/mandos"
122
#define SECKEY "seckey.txt"
123
#define PUBKEY "pubkey.txt"
77
124
78
125
bool debug = false;
126
static const char mandos_protocol_version[] = "1";
127
const char *argp_program_version = "mandos-client " VERSION;
128
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
79
129
130
/* Used for passing in values through the Avahi callback functions */
80
131
typedef struct {
81
gnutls_session_t session;
132
AvahiSimplePoll *simple_poll;
133
AvahiServer *server;
82
134
gnutls_certificate_credentials_t cred;
135
unsigned int dh_bits;
83
136
gnutls_dh_params_t dh_params;
84
} encrypted_session;
85
86
87
ssize_t pgp_packet_decrypt (char *packet, size_t packet_size,
88
char **new_packet, const char *homedir){
89
gpgme_data_t dh_crypto, dh_plain;
137
const char *priority;
90
138
gpgme_ctx_t ctx;
139
} mandos_context;
140
141
/* global context so signal handler can reach it*/
142
mandos_context mc = { .simple_poll = NULL, .server = NULL,
143
.dh_bits = 1024, .priority = "SECURE256"
144
":!CTYPE-X.509:+CTYPE-OPENPGP" };
145
146
sig_atomic_t quit_now = 0;
147
int signal_received = 0;
148
149
/*
150
* Make additional room in "buffer" for at least BUFFER_SIZE more
151
* bytes. "buffer_capacity" is how much is currently allocated,
152
* "buffer_length" is how much is already used.
153
*/
154
size_t incbuffer(char **buffer, size_t buffer_length,
155
size_t buffer_capacity){
156
if(buffer_length + BUFFER_SIZE > buffer_capacity){
157
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
158
if(buffer == NULL){
159
return 0;
160
}
161
buffer_capacity += BUFFER_SIZE;
162
}
163
return buffer_capacity;
164
}
165
166
/*
167
* Initialize GPGME.
168
*/
169
static bool init_gpgme(const char *seckey,
170
const char *pubkey, const char *tempdir){
91
171
gpgme_error_t rc;
92
ssize_t ret;
93
ssize_t new_packet_capacity = 0;
94
ssize_t new_packet_length = 0;
95
172
gpgme_engine_info_t engine_info;
96
97
if (debug){
98
fprintf(stderr, "Trying to decrypt OpenPGP packet\n");
173
174
175
/*
176
* Helper function to insert pub and seckey to the engine keyring.
177
*/
178
bool import_key(const char *filename){
179
int ret;
180
int fd;
181
gpgme_data_t pgp_data;
182
183
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
184
if(fd == -1){
185
perror("open");
186
return false;
187
}
188
189
rc = gpgme_data_new_from_fd(&pgp_data, fd);
190
if(rc != GPG_ERR_NO_ERROR){
191
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
192
gpgme_strsource(rc), gpgme_strerror(rc));
193
return false;
194
}
195
196
rc = gpgme_op_import(mc.ctx, pgp_data);
197
if(rc != GPG_ERR_NO_ERROR){
198
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
199
gpgme_strsource(rc), gpgme_strerror(rc));
200
return false;
201
}
202
203
ret = (int)TEMP_FAILURE_RETRY(close(fd));
204
if(ret == -1){
205
perror("close");
206
}
207
gpgme_data_release(pgp_data);
208
return true;
209
}
210
211
if(debug){
212
fprintf(stderr, "Initializing GPGME\n");
99
213
}
100
214
101
215
/* Init GPGME */
102
216
gpgme_check_version(NULL);
103
gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
217
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
218
if(rc != GPG_ERR_NO_ERROR){
219
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
220
gpgme_strsource(rc), gpgme_strerror(rc));
221
return false;
222
}
104
223
105
/* Set GPGME home directory */
106
rc = gpgme_get_engine_info (&engine_info);
107
if (rc != GPG_ERR_NO_ERROR){
224
/* Set GPGME home directory for the OpenPGP engine only */
225
rc = gpgme_get_engine_info(&engine_info);
226
if(rc != GPG_ERR_NO_ERROR){
108
227
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
109
228
gpgme_strsource(rc), gpgme_strerror(rc));
110
return -1;
229
return false;
111
230
}
112
231
while(engine_info != NULL){
113
232
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
114
233
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
115
engine_info->file_name, homedir);
234
engine_info->file_name, tempdir);
116
235
break;
117
236
}
118
237
engine_info = engine_info->next;
119
238
}
120
239
if(engine_info == NULL){
121
fprintf(stderr, "Could not set home dir to %s\n", homedir);
122
return -1;
123
}
124
125
/* Create new GPGME data buffer from packet buffer */
126
rc = gpgme_data_new_from_mem(&dh_crypto, packet, packet_size, 0);
127
if (rc != GPG_ERR_NO_ERROR){
240
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
241
return false;
242
}
243
244
/* Create new GPGME "context" */
245
rc = gpgme_new(&(mc.ctx));
246
if(rc != GPG_ERR_NO_ERROR){
247
fprintf(stderr, "bad gpgme_new: %s: %s\n",
248
gpgme_strsource(rc), gpgme_strerror(rc));
249
return false;
250
}
251
252
if(not import_key(pubkey) or not import_key(seckey)){
253
return false;
254
}
255
256
return true;
257
}
258
259
/*
260
* Decrypt OpenPGP data.
261
* Returns -1 on error
262
*/
263
static ssize_t pgp_packet_decrypt(const char *cryptotext,
264
size_t crypto_size,
265
char **plaintext){
266
gpgme_data_t dh_crypto, dh_plain;
267
gpgme_error_t rc;
268
ssize_t ret;
269
size_t plaintext_capacity = 0;
270
ssize_t plaintext_length = 0;
271
272
if(debug){
273
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
274
}
275
276
/* Create new GPGME data buffer from memory cryptotext */
277
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
278
0);
279
if(rc != GPG_ERR_NO_ERROR){
128
280
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
129
281
gpgme_strsource(rc), gpgme_strerror(rc));
130
282
return -1;
132
284
133
285
/* Create new empty GPGME data buffer for the plaintext */
134
286
rc = gpgme_data_new(&dh_plain);
135
if (rc != GPG_ERR_NO_ERROR){
287
if(rc != GPG_ERR_NO_ERROR){
136
288
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
137
289
gpgme_strsource(rc), gpgme_strerror(rc));
138
return -1;
139
}
140
141
/* Create new GPGME "context" */
142
rc = gpgme_new(&ctx);
143
if (rc != GPG_ERR_NO_ERROR){
144
fprintf(stderr, "bad gpgme_new: %s: %s\n",
145
gpgme_strsource(rc), gpgme_strerror(rc));
146
return -1;
147
}
148
149
/* Decrypt data from the FILE pointer to the plaintext data
150
buffer */
151
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
152
if (rc != GPG_ERR_NO_ERROR){
290
gpgme_data_release(dh_crypto);
291
return -1;
292
}
293
294
/* Decrypt data from the cryptotext data buffer to the plaintext
295
data buffer */
296
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
297
if(rc != GPG_ERR_NO_ERROR){
153
298
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
154
299
gpgme_strsource(rc), gpgme_strerror(rc));
155
return -1;
156
}
157
158
if(debug){
159
fprintf(stderr, "Decryption of OpenPGP packet succeeded\n");
160
}
161
162
if (debug){
163
gpgme_decrypt_result_t result;
164
result = gpgme_op_decrypt_result(ctx);
165
if (result == NULL){
166
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
167
} else {
168
fprintf(stderr, "Unsupported algorithm: %s\n",
169
result->unsupported_algorithm);
170
fprintf(stderr, "Wrong key usage: %d\n",
171
result->wrong_key_usage);
172
if(result->file_name != NULL){
173
fprintf(stderr, "File name: %s\n", result->file_name);
174
}
175
gpgme_recipient_t recipient;
176
recipient = result->recipients;
177
if(recipient){
300
plaintext_length = -1;
301
if(debug){
302
gpgme_decrypt_result_t result;
303
result = gpgme_op_decrypt_result(mc.ctx);
304
if(result == NULL){
305
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
306
} else {
307
fprintf(stderr, "Unsupported algorithm: %s\n",
308
result->unsupported_algorithm);
309
fprintf(stderr, "Wrong key usage: %u\n",
310
result->wrong_key_usage);
311
if(result->file_name != NULL){
312
fprintf(stderr, "File name: %s\n", result->file_name);
313
}
314
gpgme_recipient_t recipient;
315
recipient = result->recipients;
178
316
while(recipient != NULL){
179
317
fprintf(stderr, "Public key algorithm: %s\n",
180
318
gpgme_pubkey_algo_name(recipient->pubkey_algo));
186
324
}
187
325
}
188
326
}
327
goto decrypt_end;
189
328
}
190
329
191
/* Delete the GPGME FILE pointer cryptotext data buffer */
192
gpgme_data_release(dh_crypto);
330
if(debug){
331
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
332
}
193
333
194
334
/* Seek back to the beginning of the GPGME plaintext data buffer */
195
gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET);
196
197
*new_packet = 0;
335
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
336
perror("gpgme_data_seek");
337
plaintext_length = -1;
338
goto decrypt_end;
339
}
340
341
*plaintext = NULL;
198
342
while(true){
199
if (new_packet_length + BUFFER_SIZE > new_packet_capacity){
200
*new_packet = realloc(*new_packet,
201
(unsigned int)new_packet_capacity
202
+ BUFFER_SIZE);
203
if (*new_packet == NULL){
204
perror("realloc");
205
return -1;
206
}
207
new_packet_capacity += BUFFER_SIZE;
343
plaintext_capacity = incbuffer(plaintext,
344
(size_t)plaintext_length,
345
plaintext_capacity);
346
if(plaintext_capacity == 0){
347
perror("incbuffer");
348
plaintext_length = -1;
349
goto decrypt_end;
208
350
}
209
351
210
ret = gpgme_data_read(dh_plain, *new_packet + new_packet_length,
352
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
211
353
BUFFER_SIZE);
212
354
/* Print the data, if any */
213
if (ret == 0){
355
if(ret == 0){
356
/* EOF */
214
357
break;
215
358
}
216
359
if(ret < 0){
217
360
perror("gpgme_data_read");
218
return -1;
219
}
220
new_packet_length += ret;
221
}
222
223
/* FIXME: check characters before printing to screen so to not print
224
terminal control characters */
225
/* if(debug){ */
226
/* fprintf(stderr, "decrypted password is: "); */
227
/* fwrite(*new_packet, 1, new_packet_length, stderr); */
228
/* fprintf(stderr, "\n"); */
229
/* } */
361
plaintext_length = -1;
362
goto decrypt_end;
363
}
364
plaintext_length += ret;
365
}
366
367
if(debug){
368
fprintf(stderr, "Decrypted password is: ");
369
for(ssize_t i = 0; i < plaintext_length; i++){
370
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
371
}
372
fprintf(stderr, "\n");
373
}
374
375
decrypt_end:
376
377
/* Delete the GPGME cryptotext data buffer */
378
gpgme_data_release(dh_crypto);
230
379
231
380
/* Delete the GPGME plaintext data buffer */
232
381
gpgme_data_release(dh_plain);
233
return new_packet_length;
382
return plaintext_length;
234
383
}
235
384
236
static const char * safer_gnutls_strerror (int value) {
237
const char *ret = gnutls_strerror (value);
238
if (ret == NULL)
385
static const char * safer_gnutls_strerror(int value){
386
const char *ret = gnutls_strerror(value); /* Spurious warning from
387
-Wunreachable-code */
388
if(ret == NULL)
239
389
ret = "(unknown)";
240
390
return ret;
241
391
}
242
392
243
void debuggnutls(__attribute__((unused)) int level,
244
const char* string){
245
fprintf(stderr, "%s", string);
393
/* GnuTLS log function callback */
394
static void debuggnutls(__attribute__((unused)) int level,
395
const char* string){
396
fprintf(stderr, "GnuTLS: %s", string);
246
397
}
247
398
248
int initgnutls(encrypted_session *es){
249
const char *err;
399
static int init_gnutls_global(const char *pubkeyfilename,
400
const char *seckeyfilename){
250
401
int ret;
251
402
252
403
if(debug){
253
404
fprintf(stderr, "Initializing GnuTLS\n");
254
405
}
255
406
256
if ((ret = gnutls_global_init ())
257
!= GNUTLS_E_SUCCESS) {
258
fprintf (stderr, "global_init: %s\n", safer_gnutls_strerror(ret));
407
ret = gnutls_global_init();
408
if(ret != GNUTLS_E_SUCCESS){
409
fprintf(stderr, "GnuTLS global_init: %s\n",
410
safer_gnutls_strerror(ret));
259
411
return -1;
260
412
}
261
262
if (debug){
413
414
if(debug){
415
/* "Use a log level over 10 to enable all debugging options."
416
* - GnuTLS manual
417
*/
263
418
gnutls_global_set_log_level(11);
264
419
gnutls_global_set_log_function(debuggnutls);
265
420
}
266
421
267
/* openpgp credentials */
268
if ((ret = gnutls_certificate_allocate_credentials (&es->cred))
269
!= GNUTLS_E_SUCCESS) {
270
fprintf (stderr, "memory error: %s\n",
271
safer_gnutls_strerror(ret));
422
/* OpenPGP credentials */
423
gnutls_certificate_allocate_credentials(&mc.cred);
424
if(ret != GNUTLS_E_SUCCESS){
425
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
426
from
427
-Wunreachable-code
428
*/
429
safer_gnutls_strerror(ret));
430
gnutls_global_deinit();
272
431
return -1;
273
432
}
274
433
275
434
if(debug){
276
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
277
" and keyfile %s as GnuTLS credentials\n", CERTFILE,
278
KEYFILE);
435
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
436
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
437
seckeyfilename);
279
438
}
280
439
281
440
ret = gnutls_certificate_set_openpgp_key_file
282
(es->cred, CERTFILE, KEYFILE, GNUTLS_OPENPGP_FMT_BASE64);
283
if (ret != GNUTLS_E_SUCCESS) {
284
fprintf
285
(stderr, "Error[%d] while reading the OpenPGP key pair ('%s',"
286
" '%s')\n",
287
ret, CERTFILE, KEYFILE);
288
fprintf(stdout, "The Error is: %s\n",
289
safer_gnutls_strerror(ret));
290
return -1;
291
}
292
293
//GnuTLS server initialization
294
if ((ret = gnutls_dh_params_init (&es->dh_params))
295
!= GNUTLS_E_SUCCESS) {
296
fprintf (stderr, "Error in dh parameter initialization: %s\n",
297
safer_gnutls_strerror(ret));
298
return -1;
299
}
300
301
if ((ret = gnutls_dh_params_generate2 (es->dh_params, DH_BITS))
302
!= GNUTLS_E_SUCCESS) {
303
fprintf (stderr, "Error in prime generation: %s\n",
304
safer_gnutls_strerror(ret));
305
return -1;
306
}
307
308
gnutls_certificate_set_dh_params (es->cred, es->dh_params);
309
310
// GnuTLS session creation
311
if ((ret = gnutls_init (&es->session, GNUTLS_SERVER))
312
!= GNUTLS_E_SUCCESS){
441
(mc.cred, pubkeyfilename, seckeyfilename,
442
GNUTLS_OPENPGP_FMT_BASE64);
443
if(ret != GNUTLS_E_SUCCESS){
444
fprintf(stderr,
445
"Error[%d] while reading the OpenPGP key pair ('%s',"
446
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
447
fprintf(stderr, "The GnuTLS error is: %s\n",
448
safer_gnutls_strerror(ret));
449
goto globalfail;
450
}
451
452
/* GnuTLS server initialization */
453
ret = gnutls_dh_params_init(&mc.dh_params);
454
if(ret != GNUTLS_E_SUCCESS){
455
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
456
" %s\n", safer_gnutls_strerror(ret));
457
goto globalfail;
458
}
459
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
460
if(ret != GNUTLS_E_SUCCESS){
461
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
462
safer_gnutls_strerror(ret));
463
goto globalfail;
464
}
465
466
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
467
468
return 0;
469
470
globalfail:
471
472
gnutls_certificate_free_credentials(mc.cred);
473
gnutls_global_deinit();
474
gnutls_dh_params_deinit(mc.dh_params);
475
return -1;
476
}
477
478
static int init_gnutls_session(gnutls_session_t *session){
479
int ret;
480
/* GnuTLS session creation */
481
do {
482
ret = gnutls_init(session, GNUTLS_SERVER);
483
if(quit_now){
484
return -1;
485
}
486
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
487
if(ret != GNUTLS_E_SUCCESS){
313
488
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
314
489
safer_gnutls_strerror(ret));
315
490
}
316
491
317
if ((ret = gnutls_priority_set_direct (es->session, "NORMAL", &err))
318
!= GNUTLS_E_SUCCESS) {
319
fprintf(stderr, "Syntax error at: %s\n", err);
320
fprintf(stderr, "GnuTLS error: %s\n",
321
safer_gnutls_strerror(ret));
322
return -1;
492
{
493
const char *err;
494
do {
495
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
496
if(quit_now){
497
gnutls_deinit(*session);
498
return -1;
499
}
500
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
501
if(ret != GNUTLS_E_SUCCESS){
502
fprintf(stderr, "Syntax error at: %s\n", err);
503
fprintf(stderr, "GnuTLS error: %s\n",
504
safer_gnutls_strerror(ret));
505
gnutls_deinit(*session);
506
return -1;
507
}
323
508
}
324
509
325
if ((ret = gnutls_credentials_set
326
(es->session, GNUTLS_CRD_CERTIFICATE, es->cred))
327
!= GNUTLS_E_SUCCESS) {
328
fprintf(stderr, "Error setting a credentials set: %s\n",
510
do {
511
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
512
mc.cred);
513
if(quit_now){
514
gnutls_deinit(*session);
515
return -1;
516
}
517
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
518
if(ret != GNUTLS_E_SUCCESS){
519
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
329
520
safer_gnutls_strerror(ret));
521
gnutls_deinit(*session);
330
522
return -1;
331
523
}
332
524
333
525
/* ignore client certificate if any. */
334
gnutls_certificate_server_set_request (es->session,
335
GNUTLS_CERT_IGNORE);
526
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
336
527
337
gnutls_dh_set_prime_bits (es->session, DH_BITS);
528
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
338
529
339
530
return 0;
340
531
}
341
532
342
void empty_log(__attribute__((unused)) AvahiLogLevel level,
343
__attribute__((unused)) const char *txt){}
533
/* Avahi log function callback */
534
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
535
__attribute__((unused)) const char *txt){}
344
536
345
int start_mandos_communication(const char *ip, uint16_t port,
346
unsigned int if_index){
347
int ret, tcp_sd;
348
struct sockaddr_in6 to;
349
encrypted_session es;
537
/* Called when a Mandos server is found */
538
static int start_mandos_communication(const char *ip, uint16_t port,
539
AvahiIfIndex if_index,
540
int af){
541
int ret, tcp_sd = -1;
542
ssize_t sret;
543
union {
544
struct sockaddr_in in;
545
struct sockaddr_in6 in6;
546
} to;
350
547
char *buffer = NULL;
351
char *decrypted_buffer;
548
char *decrypted_buffer = NULL;
352
549
size_t buffer_length = 0;
353
550
size_t buffer_capacity = 0;
354
ssize_t decrypted_buffer_size;
355
size_t written = 0;
356
int retval = 0;
357
char interface[IF_NAMESIZE];
551
size_t written;
552
int retval = -1;
553
gnutls_session_t session;
554
int pf; /* Protocol family */
555
556
if(quit_now){
557
return -1;
558
}
559
560
switch(af){
561
case AF_INET6:
562
pf = PF_INET6;
563
break;
564
case AF_INET:
565
pf = PF_INET;
566
break;
567
default:
568
fprintf(stderr, "Bad address family: %d\n", af);
569
return -1;
570
}
571
572
ret = init_gnutls_session(&session);
573
if(ret != 0){
574
return -1;
575
}
358
576
359
577
if(debug){
360
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
361
ip, port);
578
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
579
"\n", ip, port);
362
580
}
363
581
364
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
365
if(tcp_sd < 0) {
582
tcp_sd = socket(pf, SOCK_STREAM, 0);
583
if(tcp_sd < 0){
366
584
perror("socket");
367
return -1;
368
}
369
370
if(if_indextoname(if_index, interface) == NULL){
371
if(debug){
372
perror("if_indextoname");
373
}
374
return -1;
375
}
376
377
if(debug){
378
fprintf(stderr, "Binding to interface %s\n", interface);
379
}
380
381
memset(&to,0,sizeof(to)); /* Spurious warning */
382
to.sin6_family = AF_INET6;
383
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
384
if (ret < 0 ){
585
goto mandos_end;
586
}
587
588
if(quit_now){
589
goto mandos_end;
590
}
591
592
memset(&to, 0, sizeof(to));
593
if(af == AF_INET6){
594
to.in6.sin6_family = (sa_family_t)af;
595
ret = inet_pton(af, ip, &to.in6.sin6_addr);
596
} else { /* IPv4 */
597
to.in.sin_family = (sa_family_t)af;
598
ret = inet_pton(af, ip, &to.in.sin_addr);
599
}
600
if(ret < 0 ){
385
601
perror("inet_pton");
386
return -1;
387
}
602
goto mandos_end;
603
}
388
604
if(ret == 0){
389
605
fprintf(stderr, "Bad address: %s\n", ip);
390
return -1;
391
}
392
to.sin6_port = htons(port); /* Spurious warning */
606
goto mandos_end;
607
}
608
if(af == AF_INET6){
609
to.in6.sin6_port = htons(port); /* Spurious warnings from
610
-Wconversion and
611
-Wunreachable-code */
612
613
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
614
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
615
-Wunreachable-code*/
616
if(if_index == AVAHI_IF_UNSPEC){
617
fprintf(stderr, "An IPv6 link-local address is incomplete"
618
" without a network interface\n");
619
goto mandos_end;
620
}
621
/* Set the network interface number as scope */
622
to.in6.sin6_scope_id = (uint32_t)if_index;
623
}
624
} else {
625
to.in.sin_port = htons(port); /* Spurious warnings from
626
-Wconversion and
627
-Wunreachable-code */
628
}
393
629
394
to.sin6_scope_id = (uint32_t)if_index;
630
if(quit_now){
631
goto mandos_end;
632
}
395
633
396
634
if(debug){
397
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
398
/* char addrstr[INET6_ADDRSTRLEN]; */
399
/* if(inet_ntop(to.sin6_family, &(to.sin6_addr), addrstr, */
400
/* sizeof(addrstr)) == NULL){ */
401
/* perror("inet_ntop"); */
402
/* } else { */
403
/* fprintf(stderr, "Really connecting to: %s, port %d\n", */
404
/* addrstr, ntohs(to.sin6_port)); */
405
/* } */
406
}
407
408
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
409
if (ret < 0){
635
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
636
char interface[IF_NAMESIZE];
637
if(if_indextoname((unsigned int)if_index, interface) == NULL){
638
perror("if_indextoname");
639
} else {
640
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
641
ip, interface, port);
642
}
643
} else {
644
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
645
port);
646
}
647
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
648
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
649
const char *pcret;
650
if(af == AF_INET6){
651
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
652
sizeof(addrstr));
653
} else {
654
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
655
sizeof(addrstr));
656
}
657
if(pcret == NULL){
658
perror("inet_ntop");
659
} else {
660
if(strcmp(addrstr, ip) != 0){
661
fprintf(stderr, "Canonical address form: %s\n", addrstr);
662
}
663
}
664
}
665
666
if(quit_now){
667
goto mandos_end;
668
}
669
670
if(af == AF_INET6){
671
ret = connect(tcp_sd, &to.in6, sizeof(to));
672
} else {
673
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
674
}
675
if(ret < 0){
410
676
perror("connect");
411
return -1;
412
}
413
414
ret = initgnutls (&es);
415
if (ret != 0){
416
retval = -1;
417
return -1;
418
}
419
420
gnutls_transport_set_ptr (es.session,
421
(gnutls_transport_ptr_t) tcp_sd);
677
goto mandos_end;
678
}
679
680
if(quit_now){
681
goto mandos_end;
682
}
683
684
const char *out = mandos_protocol_version;
685
written = 0;
686
while(true){
687
size_t out_size = strlen(out);
688
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
689
out_size - written));
690
if(ret == -1){
691
perror("write");
692
goto mandos_end;
693
}
694
written += (size_t)ret;
695
if(written < out_size){
696
continue;
697
} else {
698
if(out == mandos_protocol_version){
699
written = 0;
700
out = "\r\n";
701
} else {
702
break;
703
}
704
}
705
706
if(quit_now){
707
goto mandos_end;
708
}
709
}
422
710
423
711
if(debug){
424
712
fprintf(stderr, "Establishing TLS session with %s\n", ip);
425
713
}
426
714
427
ret = gnutls_handshake (es.session);
428
429
if (ret != GNUTLS_E_SUCCESS){
715
if(quit_now){
716
goto mandos_end;
717
}
718
719
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
720
721
if(quit_now){
722
goto mandos_end;
723
}
724
725
do {
726
ret = gnutls_handshake(session);
727
if(quit_now){
728
goto mandos_end;
729
}
730
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
731
732
if(ret != GNUTLS_E_SUCCESS){
430
733
if(debug){
431
fprintf(stderr, "\n*** Handshake failed ***\n");
432
gnutls_perror (ret);
734
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
735
gnutls_perror(ret);
433
736
}
434
retval = -1;
435
goto exit;
737
goto mandos_end;
436
738
}
437
739
438
//Retrieve OpenPGP packet that contains the wanted password
740
/* Read OpenPGP packet that contains the wanted password */
439
741
440
742
if(debug){
441
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
743
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
442
744
ip);
443
745
}
444
746
445
747
while(true){
446
if (buffer_length + BUFFER_SIZE > buffer_capacity){
447
buffer = realloc(buffer, buffer_capacity + BUFFER_SIZE);
448
if (buffer == NULL){
449
perror("realloc");
450
goto exit;
451
}
452
buffer_capacity += BUFFER_SIZE;
453
}
454
455
ret = gnutls_record_recv
456
(es.session, buffer+buffer_length, BUFFER_SIZE);
457
if (ret == 0){
748
749
if(quit_now){
750
goto mandos_end;
751
}
752
753
buffer_capacity = incbuffer(&buffer, buffer_length,
754
buffer_capacity);
755
if(buffer_capacity == 0){
756
perror("incbuffer");
757
goto mandos_end;
758
}
759
760
if(quit_now){
761
goto mandos_end;
762
}
763
764
sret = gnutls_record_recv(session, buffer+buffer_length,
765
BUFFER_SIZE);
766
if(sret == 0){
458
767
break;
459
768
}
460
if (ret < 0){
461
switch(ret){
769
if(sret < 0){
770
switch(sret){
462
771
case GNUTLS_E_INTERRUPTED:
463
772
case GNUTLS_E_AGAIN:
464
773
break;
465
774
case GNUTLS_E_REHANDSHAKE:
466
ret = gnutls_handshake (es.session);
467
if (ret < 0){
468
fprintf(stderr, "\n*** Handshake failed ***\n");
469
gnutls_perror (ret);
470
retval = -1;
471
goto exit;
775
do {
776
ret = gnutls_handshake(session);
777
778
if(quit_now){
779
goto mandos_end;
780
}
781
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
782
if(ret < 0){
783
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
784
gnutls_perror(ret);
785
goto mandos_end;
472
786
}
473
787
break;
474
788
default:
475
789
fprintf(stderr, "Unknown error while reading data from"
476
" encrypted session with mandos server\n");
477
retval = -1;
478
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
479
goto exit;
790
" encrypted session with Mandos server\n");
791
gnutls_bye(session, GNUTLS_SHUT_RDWR);
792
goto mandos_end;
480
793
}
481
794
} else {
482
buffer_length += (size_t) ret;
483
}
484
}
485
486
if (buffer_length > 0){
795
buffer_length += (size_t) sret;
796
}
797
}
798
799
if(debug){
800
fprintf(stderr, "Closing TLS session\n");
801
}
802
803
if(quit_now){
804
goto mandos_end;
805
}
806
807
do {
808
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
809
if(quit_now){
810
goto mandos_end;
811
}
812
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
813
814
if(buffer_length > 0){
815
ssize_t decrypted_buffer_size;
487
816
decrypted_buffer_size = pgp_packet_decrypt(buffer,
488
817
buffer_length,
489
&decrypted_buffer,
490
CERT_ROOT);
491
if (decrypted_buffer_size >= 0){
818
&decrypted_buffer);
819
if(decrypted_buffer_size >= 0){
820
821
written = 0;
492
822
while(written < (size_t) decrypted_buffer_size){
493
ret = (int)fwrite (decrypted_buffer + written, 1,
494
(size_t)decrypted_buffer_size - written,
495
stdout);
823
if(quit_now){
824
goto mandos_end;
825
}
826
827
ret = (int)fwrite(decrypted_buffer + written, 1,
828
(size_t)decrypted_buffer_size - written,
829
stdout);
496
830
if(ret == 0 and ferror(stdout)){
497
831
if(debug){
498
832
fprintf(stderr, "Error writing encrypted data: %s\n",
499
833
strerror(errno));
500
834
}
501
retval = -1;
502
break;
835
goto mandos_end;
503
836
}
504
837
written += (size_t)ret;
505
838
}
506
free(decrypted_buffer);
507
} else {
508
retval = -1;
839
retval = 0;
509
840
}
510
841
}
511
512
//shutdown procedure
513
514
if(debug){
515
fprintf(stderr, "Closing TLS session\n");
516
}
517
842
843
/* Shutdown procedure */
844
845
mandos_end:
846
free(decrypted_buffer);
518
847
free(buffer);
519
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
520
exit:
521
close(tcp_sd);
522
gnutls_deinit (es.session);
523
gnutls_certificate_free_credentials (es.cred);
524
gnutls_global_deinit ();
848
if(tcp_sd >= 0){
849
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
850
}
851
if(ret == -1){
852
perror("close");
853
}
854
gnutls_deinit(session);
855
if(quit_now){
856
retval = -1;
857
}
525
858
return retval;
526
859
}
527
860
528
static AvahiSimplePoll *simple_poll = NULL;
529
static AvahiServer *server = NULL;
530
531
static void resolve_callback(
532
AvahiSServiceResolver *r,
533
AvahiIfIndex interface,
534
AVAHI_GCC_UNUSED AvahiProtocol protocol,
535
AvahiResolverEvent event,
536
const char *name,
537
const char *type,
538
const char *domain,
539
const char *host_name,
540
const AvahiAddress *address,
541
uint16_t port,
542
AVAHI_GCC_UNUSED AvahiStringList *txt,
543
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
544
AVAHI_GCC_UNUSED void* userdata) {
545
546
assert(r); /* Spurious warning */
861
static void resolve_callback(AvahiSServiceResolver *r,
862
AvahiIfIndex interface,
863
AvahiProtocol proto,
864
AvahiResolverEvent event,
865
const char *name,
866
const char *type,
867
const char *domain,
868
const char *host_name,
869
const AvahiAddress *address,
870
uint16_t port,
871
AVAHI_GCC_UNUSED AvahiStringList *txt,
872
AVAHI_GCC_UNUSED AvahiLookupResultFlags
873
flags,
874
AVAHI_GCC_UNUSED void* userdata){
875
assert(r);
547
876
548
877
/* Called whenever a service has been resolved successfully or
549
878
timed out */
550
879
551
switch (event) {
880
if(quit_now){
881
return;
882
}
883
884
switch(event){
552
885
default:
553
886
case AVAHI_RESOLVER_FAILURE:
554
fprintf(stderr, "(Resolver) Failed to resolve service '%s' of"
555
" type '%s' in domain '%s': %s\n", name, type, domain,
556
avahi_strerror(avahi_server_errno(server)));
887
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
888
" of type '%s' in domain '%s': %s\n", name, type, domain,
889
avahi_strerror(avahi_server_errno(mc.server)));
557
890
break;
558
891
559
892
case AVAHI_RESOLVER_FOUND:
561
894
char ip[AVAHI_ADDRESS_STR_MAX];
562
895
avahi_address_snprint(ip, sizeof(ip), address);
563
896
if(debug){
564
fprintf(stderr, "Mandos server \"%s\" found on %s (%s) on"
565
" port %d\n", name, host_name, ip, port);
897
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
898
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
899
ip, (intmax_t)interface, port);
566
900
}
567
int ret = start_mandos_communication(ip, port,
568
(unsigned int) interface);
569
if (ret == 0){
570
exit(EXIT_SUCCESS);
901
int ret = start_mandos_communication(ip, port, interface,
902
avahi_proto_to_af(proto));
903
if(ret == 0){
904
avahi_simple_poll_quit(mc.simple_poll);
571
905
}
572
906
}
573
907
}
574
908
avahi_s_service_resolver_free(r);
575
909
}
576
910
577
static void browse_callback(
578
AvahiSServiceBrowser *b,
579
AvahiIfIndex interface,
580
AvahiProtocol protocol,
581
AvahiBrowserEvent event,
582
const char *name,
583
const char *type,
584
const char *domain,
585
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
586
void* userdata) {
587
588
AvahiServer *s = userdata;
589
assert(b); /* Spurious warning */
590
591
/* Called whenever a new services becomes available on the LAN or
592
is removed from the LAN */
593
594
switch (event) {
911
static void browse_callback(AvahiSServiceBrowser *b,
912
AvahiIfIndex interface,
913
AvahiProtocol protocol,
914
AvahiBrowserEvent event,
915
const char *name,
916
const char *type,
917
const char *domain,
918
AVAHI_GCC_UNUSED AvahiLookupResultFlags
919
flags,
920
AVAHI_GCC_UNUSED void* userdata){
921
assert(b);
922
923
/* Called whenever a new services becomes available on the LAN or
924
is removed from the LAN */
925
926
if(quit_now){
927
return;
928
}
929
930
switch(event){
931
default:
932
case AVAHI_BROWSER_FAILURE:
933
934
fprintf(stderr, "(Avahi browser) %s\n",
935
avahi_strerror(avahi_server_errno(mc.server)));
936
avahi_simple_poll_quit(mc.simple_poll);
937
return;
938
939
case AVAHI_BROWSER_NEW:
940
/* We ignore the returned Avahi resolver object. In the callback
941
function we free it. If the Avahi server is terminated before
942
the callback function is called the Avahi server will free the
943
resolver for us. */
944
945
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
946
name, type, domain, protocol, 0,
947
resolve_callback, NULL) == NULL)
948
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
949
name, avahi_strerror(avahi_server_errno(mc.server)));
950
break;
951
952
case AVAHI_BROWSER_REMOVE:
953
break;
954
955
case AVAHI_BROWSER_ALL_FOR_NOW:
956
case AVAHI_BROWSER_CACHE_EXHAUSTED:
957
if(debug){
958
fprintf(stderr, "No Mandos server found, still searching...\n");
959
}
960
break;
961
}
962
}
963
964
/* stop main loop after sigterm has been called */
965
static void handle_sigterm(int sig){
966
if(quit_now){
967
return;
968
}
969
quit_now = 1;
970
signal_received = sig;
971
int old_errno = errno;
972
if(mc.simple_poll != NULL){
973
avahi_simple_poll_quit(mc.simple_poll);
974
}
975
errno = old_errno;
976
}
977
978
int main(int argc, char *argv[]){
979
AvahiSServiceBrowser *sb = NULL;
980
int error;
981
int ret;
982
intmax_t tmpmax;
983
char *tmp;
984
int exitcode = EXIT_SUCCESS;
985
const char *interface = "eth0";
986
struct ifreq network;
987
int sd = -1;
988
bool take_down_interface = false;
989
uid_t uid;
990
gid_t gid;
991
char *connect_to = NULL;
992
char tempdir[] = "/tmp/mandosXXXXXX";
993
bool tempdir_created = false;
994
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
995
const char *seckey = PATHDIR "/" SECKEY;
996
const char *pubkey = PATHDIR "/" PUBKEY;
997
998
bool gnutls_initialized = false;
999
bool gpgme_initialized = false;
1000
float delay = 2.5f;
1001
1002
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1003
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1004
1005
uid = getuid();
1006
gid = getgid();
1007
1008
/* Lower any group privileges we might have, just to be safe */
1009
errno = 0;
1010
ret = setgid(gid);
1011
if(ret == -1){
1012
perror("setgid");
1013
}
1014
1015
/* Lower user privileges (temporarily) */
1016
errno = 0;
1017
ret = seteuid(uid);
1018
if(ret == -1){
1019
perror("seteuid");
1020
}
1021
1022
if(quit_now){
1023
goto end;
1024
}
1025
1026
{
1027
struct argp_option options[] = {
1028
{ .name = "debug", .key = 128,
1029
.doc = "Debug mode", .group = 3 },
1030
{ .name = "connect", .key = 'c',
1031
.arg = "ADDRESS:PORT",
1032
.doc = "Connect directly to a specific Mandos server",
1033
.group = 1 },
1034
{ .name = "interface", .key = 'i',
1035
.arg = "NAME",
1036
.doc = "Network interface that will be used to search for"
1037
" Mandos servers",
1038
.group = 1 },
1039
{ .name = "seckey", .key = 's',
1040
.arg = "FILE",
1041
.doc = "OpenPGP secret key file base name",
1042
.group = 1 },
1043
{ .name = "pubkey", .key = 'p',
1044
.arg = "FILE",
1045
.doc = "OpenPGP public key file base name",
1046
.group = 2 },
1047
{ .name = "dh-bits", .key = 129,
1048
.arg = "BITS",
1049
.doc = "Bit length of the prime number used in the"
1050
" Diffie-Hellman key exchange",
1051
.group = 2 },
1052
{ .name = "priority", .key = 130,
1053
.arg = "STRING",
1054
.doc = "GnuTLS priority string for the TLS handshake",
1055
.group = 1 },
1056
{ .name = "delay", .key = 131,
1057
.arg = "SECONDS",
1058
.doc = "Maximum delay to wait for interface startup",
1059
.group = 2 },
1060
/*
1061
* These reproduce what we would get without ARGP_NO_HELP
1062
*/
1063
{ .name = "help", .key = '?',
1064
.doc = "Give this help list", .group = -1 },
1065
{ .name = "usage", .key = -3,
1066
.doc = "Give a short usage message", .group = -1 },
1067
{ .name = "version", .key = 'V',
1068
.doc = "Print program version", .group = -1 },
1069
{ .name = NULL }
1070
};
1071
1072
error_t parse_opt(int key, char *arg,
1073
struct argp_state *state){
1074
errno = 0;
1075
switch(key){
1076
case 128: /* --debug */
1077
debug = true;
1078
break;
1079
case 'c': /* --connect */
1080
connect_to = arg;
1081
break;
1082
case 'i': /* --interface */
1083
interface = arg;
1084
break;
1085
case 's': /* --seckey */
1086
seckey = arg;
1087
break;
1088
case 'p': /* --pubkey */
1089
pubkey = arg;
1090
break;
1091
case 129: /* --dh-bits */
1092
errno = 0;
1093
tmpmax = strtoimax(arg, &tmp, 10);
1094
if(errno != 0 or tmp == arg or *tmp != '\0'
1095
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1096
argp_error(state, "Bad number of DH bits");
1097
}
1098
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1099
break;
1100
case 130: /* --priority */
1101
mc.priority = arg;
1102
break;
1103
case 131: /* --delay */
1104
errno = 0;
1105
delay = strtof(arg, &tmp);
1106
if(errno != 0 or tmp == arg or *tmp != '\0'){
1107
argp_error(state, "Bad delay");
1108
}
1109
break;
1110
/*
1111
* These reproduce what we would get without ARGP_NO_HELP
1112
*/
1113
case '?': /* --help */
1114
argp_state_help(state, state->out_stream,
1115
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1116
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1117
case -3: /* --usage */
1118
argp_state_help(state, state->out_stream,
1119
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1120
case 'V': /* --version */
1121
fprintf(state->out_stream, "%s\n", argp_program_version);
1122
exit(argp_err_exit_status);
1123
break;
1124
default:
1125
return ARGP_ERR_UNKNOWN;
1126
}
1127
return errno;
1128
}
1129
1130
struct argp argp = { .options = options, .parser = parse_opt,
1131
.args_doc = "",
1132
.doc = "Mandos client -- Get and decrypt"
1133
" passwords from a Mandos server" };
1134
ret = argp_parse(&argp, argc, argv,
1135
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1136
switch(ret){
1137
case 0:
1138
break;
1139
case ENOMEM:
595
1140
default:
596
case AVAHI_BROWSER_FAILURE:
597
598
fprintf(stderr, "(Browser) %s\n",
599
avahi_strerror(avahi_server_errno(server)));
600
avahi_simple_poll_quit(simple_poll);
601
return;
602
603
case AVAHI_BROWSER_NEW:
604
/* We ignore the returned resolver object. In the callback
605
function we free it. If the server is terminated before
606
the callback function is called the server will free
607
the resolver for us. */
608
609
if (!(avahi_s_service_resolver_new(s, interface, protocol, name,
610
type, domain,
611
AVAHI_PROTO_INET6, 0,
612
resolve_callback, s)))
613
fprintf(stderr, "Failed to resolve service '%s': %s\n", name,
614
avahi_strerror(avahi_server_errno(s)));
615
break;
616
617
case AVAHI_BROWSER_REMOVE:
618
break;
619
620
case AVAHI_BROWSER_ALL_FOR_NOW:
621
case AVAHI_BROWSER_CACHE_EXHAUSTED:
622
break;
623
}
624
}
625
626
int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
627
AvahiServerConfig config;
628
AvahiSServiceBrowser *sb = NULL;
629
int error;
630
int ret;
631
int returncode = EXIT_SUCCESS;
632
const char *interface = "eth0";
633
unsigned int if_index;
634
char *connect_to = NULL;
635
636
while (true){
637
static struct option long_options[] = {
638
{"debug", no_argument, (int *)&debug, 1},
639
{"connect", required_argument, 0, 'c'},
640
{"interface", required_argument, 0, 'i'},
641
{0, 0, 0, 0} };
642
643
int option_index = 0;
644
ret = getopt_long (argc, argv, "i:", long_options,
645
&option_index);
646
647
if (ret == -1){
648
break;
649
}
650
651
switch(ret){
652
case 0:
653
break;
654
case 'i':
655
interface = optarg;
656
break;
657
case 'c':
658
connect_to = optarg;
659
break;
660
default:
661
exit(EXIT_FAILURE);
662
}
663
}
664
665
if_index = if_nametoindex(interface);
1141
errno = ret;
1142
perror("argp_parse");
1143
exitcode = EX_OSERR;
1144
goto end;
1145
case EINVAL:
1146
exitcode = EX_USAGE;
1147
goto end;
1148
}
1149
}
1150
1151
if(not debug){
1152
avahi_set_log_function(empty_log);
1153
}
1154
1155
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1156
from the signal handler */
1157
/* Initialize the pseudo-RNG for Avahi */
1158
srand((unsigned int) time(NULL));
1159
mc.simple_poll = avahi_simple_poll_new();
1160
if(mc.simple_poll == NULL){
1161
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1162
exitcode = EXIT_FAILURE;
1163
goto end;
1164
}
1165
1166
sigemptyset(&sigterm_action.sa_mask);
1167
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1168
if(ret == -1){
1169
perror("sigaddset");
1170
exitcode = EXIT_FAILURE;
1171
goto end;
1172
}
1173
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1174
if(ret == -1){
1175
perror("sigaddset");
1176
exitcode = EXIT_FAILURE;
1177
goto end;
1178
}
1179
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1180
if(ret == -1){
1181
perror("sigaddset");
1182
exitcode = EXIT_FAILURE;
1183
goto end;
1184
}
1185
/* Need to check if the handler is SIG_IGN before handling:
1186
| [[info:libc:Initial Signal Actions]] |
1187
| [[info:libc:Basic Signal Handling]] |
1188
*/
1189
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1190
if(ret == -1){
1191
perror("sigaction");
1192
return EXIT_FAILURE;
1193
}
1194
if(old_sigterm_action.sa_handler != SIG_IGN){
1195
ret = sigaction(SIGINT, &sigterm_action, NULL);
1196
if(ret == -1){
1197
perror("sigaction");
1198
exitcode = EXIT_FAILURE;
1199
goto end;
1200
}
1201
}
1202
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1203
if(ret == -1){
1204
perror("sigaction");
1205
return EXIT_FAILURE;
1206
}
1207
if(old_sigterm_action.sa_handler != SIG_IGN){
1208
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1209
if(ret == -1){
1210
perror("sigaction");
1211
exitcode = EXIT_FAILURE;
1212
goto end;
1213
}
1214
}
1215
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1216
if(ret == -1){
1217
perror("sigaction");
1218
return EXIT_FAILURE;
1219
}
1220
if(old_sigterm_action.sa_handler != SIG_IGN){
1221
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1222
if(ret == -1){
1223
perror("sigaction");
1224
exitcode = EXIT_FAILURE;
1225
goto end;
1226
}
1227
}
1228
1229
/* If the interface is down, bring it up */
1230
if(interface[0] != '\0'){
1231
if_index = (AvahiIfIndex) if_nametoindex(interface);
666
1232
if(if_index == 0){
667
1233
fprintf(stderr, "No such interface: \"%s\"\n", interface);
668
exit(EXIT_FAILURE);
669
}
670
671
if(connect_to != NULL){
672
/* Connect directly, do not use Zeroconf */
673
/* (Mainly meant for debugging) */
674
char *address = strrchr(connect_to, ':');
675
if(address == NULL){
676
fprintf(stderr, "No colon in address\n");
677
exit(EXIT_FAILURE);
678
}
679
errno = 0;
680
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
681
if(errno){
682
perror("Bad port number");
683
exit(EXIT_FAILURE);
684
}
685
*address = '\0';
686
address = connect_to;
687
ret = start_mandos_communication(address, port, if_index);
688
if(ret < 0){
689
exit(EXIT_FAILURE);
690
} else {
691
exit(EXIT_SUCCESS);
692
}
693
}
694
695
if (not debug){
696
avahi_set_log_function(empty_log);
697
}
698
699
/* Initialize the psuedo-RNG */
700
srand((unsigned int) time(NULL));
701
702
/* Allocate main loop object */
703
if (!(simple_poll = avahi_simple_poll_new())) {
704
fprintf(stderr, "Failed to create simple poll object.\n");
705
706
goto exit;
707
}
708
709
/* Do not publish any local records */
1234
exitcode = EXIT_FAILURE;
1235
goto end;
1236
}
1237
1238
if(quit_now){
1239
goto end;
1240
}
1241
1242
/* Re-raise priviliges */
1243
errno = 0;
1244
ret = seteuid(0);
1245
if(ret == -1){
1246
perror("seteuid");
1247
}
1248
1249
#ifdef __linux__
1250
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1251
messages about the network interface to mess up the prompt */
1252
ret = klogctl(8, NULL, 5);
1253
bool restore_loglevel = true;
1254
if(ret == -1){
1255
restore_loglevel = false;
1256
perror("klogctl");
1257
}
1258
#endif /* __linux__ */
1259
1260
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1261
if(sd < 0){
1262
perror("socket");
1263
exitcode = EXIT_FAILURE;
1264
#ifdef __linux__
1265
if(restore_loglevel){
1266
ret = klogctl(7, NULL, 0);
1267
if(ret == -1){
1268
perror("klogctl");
1269
}
1270
}
1271
#endif /* __linux__ */
1272
/* Lower privileges */
1273
errno = 0;
1274
ret = seteuid(uid);
1275
if(ret == -1){
1276
perror("seteuid");
1277
}
1278
goto end;
1279
}
1280
strcpy(network.ifr_name, interface);
1281
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1282
if(ret == -1){
1283
perror("ioctl SIOCGIFFLAGS");
1284
#ifdef __linux__
1285
if(restore_loglevel){
1286
ret = klogctl(7, NULL, 0);
1287
if(ret == -1){
1288
perror("klogctl");
1289
}
1290
}
1291
#endif /* __linux__ */
1292
exitcode = EXIT_FAILURE;
1293
/* Lower privileges */
1294
errno = 0;
1295
ret = seteuid(uid);
1296
if(ret == -1){
1297
perror("seteuid");
1298
}
1299
goto end;
1300
}
1301
if((network.ifr_flags & IFF_UP) == 0){
1302
network.ifr_flags |= IFF_UP;
1303
take_down_interface = true;
1304
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1305
if(ret == -1){
1306
take_down_interface = false;
1307
perror("ioctl SIOCSIFFLAGS");
1308
exitcode = EXIT_FAILURE;
1309
#ifdef __linux__
1310
if(restore_loglevel){
1311
ret = klogctl(7, NULL, 0);
1312
if(ret == -1){
1313
perror("klogctl");
1314
}
1315
}
1316
#endif /* __linux__ */
1317
/* Lower privileges */
1318
errno = 0;
1319
ret = seteuid(uid);
1320
if(ret == -1){
1321
perror("seteuid");
1322
}
1323
goto end;
1324
}
1325
}
1326
/* sleep checking until interface is running */
1327
for(int i=0; i < delay * 4; i++){
1328
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1329
if(ret == -1){
1330
perror("ioctl SIOCGIFFLAGS");
1331
} else if(network.ifr_flags & IFF_RUNNING){
1332
break;
1333
}
1334
struct timespec sleeptime = { .tv_nsec = 250000000 };
1335
ret = nanosleep(&sleeptime, NULL);
1336
if(ret == -1 and errno != EINTR){
1337
perror("nanosleep");
1338
}
1339
}
1340
if(not take_down_interface){
1341
/* We won't need the socket anymore */
1342
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1343
if(ret == -1){
1344
perror("close");
1345
}
1346
}
1347
#ifdef __linux__
1348
if(restore_loglevel){
1349
/* Restores kernel loglevel to default */
1350
ret = klogctl(7, NULL, 0);
1351
if(ret == -1){
1352
perror("klogctl");
1353
}
1354
}
1355
#endif /* __linux__ */
1356
/* Lower privileges */
1357
errno = 0;
1358
if(take_down_interface){
1359
/* Lower privileges */
1360
ret = seteuid(uid);
1361
if(ret == -1){
1362
perror("seteuid");
1363
}
1364
} else {
1365
/* Lower privileges permanently */
1366
ret = setuid(uid);
1367
if(ret == -1){
1368
perror("setuid");
1369
}
1370
}
1371
}
1372
1373
if(quit_now){
1374
goto end;
1375
}
1376
1377
ret = init_gnutls_global(pubkey, seckey);
1378
if(ret == -1){
1379
fprintf(stderr, "init_gnutls_global failed\n");
1380
exitcode = EXIT_FAILURE;
1381
goto end;
1382
} else {
1383
gnutls_initialized = true;
1384
}
1385
1386
if(quit_now){
1387
goto end;
1388
}
1389
1390
tempdir_created = true;
1391
if(mkdtemp(tempdir) == NULL){
1392
tempdir_created = false;
1393
perror("mkdtemp");
1394
goto end;
1395
}
1396
1397
if(quit_now){
1398
goto end;
1399
}
1400
1401
if(not init_gpgme(pubkey, seckey, tempdir)){
1402
fprintf(stderr, "init_gpgme failed\n");
1403
exitcode = EXIT_FAILURE;
1404
goto end;
1405
} else {
1406
gpgme_initialized = true;
1407
}
1408
1409
if(quit_now){
1410
goto end;
1411
}
1412
1413
if(connect_to != NULL){
1414
/* Connect directly, do not use Zeroconf */
1415
/* (Mainly meant for debugging) */
1416
char *address = strrchr(connect_to, ':');
1417
if(address == NULL){
1418
fprintf(stderr, "No colon in address\n");
1419
exitcode = EXIT_FAILURE;
1420
goto end;
1421
}
1422
1423
if(quit_now){
1424
goto end;
1425
}
1426
1427
uint16_t port;
1428
errno = 0;
1429
tmpmax = strtoimax(address+1, &tmp, 10);
1430
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1431
or tmpmax != (uint16_t)tmpmax){
1432
fprintf(stderr, "Bad port number\n");
1433
exitcode = EXIT_FAILURE;
1434
goto end;
1435
}
1436
1437
if(quit_now){
1438
goto end;
1439
}
1440
1441
port = (uint16_t)tmpmax;
1442
*address = '\0';
1443
address = connect_to;
1444
/* Colon in address indicates IPv6 */
1445
int af;
1446
if(strchr(address, ':') != NULL){
1447
af = AF_INET6;
1448
} else {
1449
af = AF_INET;
1450
}
1451
1452
if(quit_now){
1453
goto end;
1454
}
1455
1456
ret = start_mandos_communication(address, port, if_index, af);
1457
if(ret < 0){
1458
exitcode = EXIT_FAILURE;
1459
} else {
1460
exitcode = EXIT_SUCCESS;
1461
}
1462
goto end;
1463
}
1464
1465
if(quit_now){
1466
goto end;
1467
}
1468
1469
{
1470
AvahiServerConfig config;
1471
/* Do not publish any local Zeroconf records */
710
1472
avahi_server_config_init(&config);
711
1473
config.publish_hinfo = 0;
712
1474
config.publish_addresses = 0;
713
1475
config.publish_workstation = 0;
714
1476
config.publish_domain = 0;
715
1477
716
1478
/* Allocate a new server */
717
server = avahi_server_new(avahi_simple_poll_get(simple_poll),
718
&config, NULL, NULL, &error);
719
720
/* Free the configuration data */
1479
mc.server = avahi_server_new(avahi_simple_poll_get
1480
(mc.simple_poll), &config, NULL,
1481
NULL, &error);
1482
1483
/* Free the Avahi configuration data */
721
1484
avahi_server_config_free(&config);
722
723
/* Check if creating the server object succeeded */
724
if (!server) {
725
fprintf(stderr, "Failed to create server: %s\n",
726
avahi_strerror(error));
727
returncode = EXIT_FAILURE;
728
goto exit;
729
}
730
731
/* Create the service browser */
732
sb = avahi_s_service_browser_new(server, (AvahiIfIndex)if_index,
733
AVAHI_PROTO_INET6,
734
"_mandos._tcp", NULL, 0,
735
browse_callback, server);
736
if (!sb) {
737
fprintf(stderr, "Failed to create service browser: %s\n",
738
avahi_strerror(avahi_server_errno(server)));
739
returncode = EXIT_FAILURE;
740
goto exit;
741
}
742
743
/* Run the main loop */
744
745
if (debug){
746
fprintf(stderr, "Starting avahi loop search\n");
747
}
748
749
avahi_simple_poll_loop(simple_poll);
750
751
exit:
752
753
if (debug){
754
fprintf(stderr, "%s exiting\n", argv[0]);
755
}
756
757
/* Cleanup things */
758
if (sb)
759
avahi_s_service_browser_free(sb);
760
761
if (server)
762
avahi_server_free(server);
763
764
if (simple_poll)
765
avahi_simple_poll_free(simple_poll);
766
767
return returncode;
1485
}
1486
1487
/* Check if creating the Avahi server object succeeded */
1488
if(mc.server == NULL){
1489
fprintf(stderr, "Failed to create Avahi server: %s\n",
1490
avahi_strerror(error));
1491
exitcode = EXIT_FAILURE;
1492
goto end;
1493
}
1494
1495
if(quit_now){
1496
goto end;
1497
}
1498
1499
/* Create the Avahi service browser */
1500
sb = avahi_s_service_browser_new(mc.server, if_index,
1501
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1502
NULL, 0, browse_callback, NULL);
1503
if(sb == NULL){
1504
fprintf(stderr, "Failed to create service browser: %s\n",
1505
avahi_strerror(avahi_server_errno(mc.server)));
1506
exitcode = EXIT_FAILURE;
1507
goto end;
1508
}
1509
1510
if(quit_now){
1511
goto end;
1512
}
1513
1514
/* Run the main loop */
1515
1516
if(debug){
1517
fprintf(stderr, "Starting Avahi loop search\n");
1518
}
1519
1520
avahi_simple_poll_loop(mc.simple_poll);
1521
1522
end:
1523
1524
if(debug){
1525
fprintf(stderr, "%s exiting\n", argv[0]);
1526
}
1527
1528
/* Cleanup things */
1529
if(sb != NULL)
1530
avahi_s_service_browser_free(sb);
1531
1532
if(mc.server != NULL)
1533
avahi_server_free(mc.server);
1534
1535
if(mc.simple_poll != NULL)
1536
avahi_simple_poll_free(mc.simple_poll);
1537
1538
if(gnutls_initialized){
1539
gnutls_certificate_free_credentials(mc.cred);
1540
gnutls_global_deinit();
1541
gnutls_dh_params_deinit(mc.dh_params);
1542
}
1543
1544
if(gpgme_initialized){
1545
gpgme_release(mc.ctx);
1546
}
1547
1548
/* Take down the network interface */
1549
if(take_down_interface){
1550
/* Re-raise priviliges */
1551
errno = 0;
1552
ret = seteuid(0);
1553
if(ret == -1){
1554
perror("seteuid");
1555
}
1556
if(geteuid() == 0){
1557
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1558
if(ret == -1){
1559
perror("ioctl SIOCGIFFLAGS");
1560
} else if(network.ifr_flags & IFF_UP) {
1561
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1562
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1563
if(ret == -1){
1564
perror("ioctl SIOCSIFFLAGS");
1565
}
1566
}
1567
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1568
if(ret == -1){
1569
perror("close");
1570
}
1571
/* Lower privileges permanently */
1572
errno = 0;
1573
ret = setuid(uid);
1574
if(ret == -1){
1575
perror("setuid");
1576
}
1577
}
1578
}
1579
1580
/* Removes the temp directory used by GPGME */
1581
if(tempdir_created){
1582
DIR *d;
1583
struct dirent *direntry;
1584
d = opendir(tempdir);
1585
if(d == NULL){
1586
if(errno != ENOENT){
1587
perror("opendir");
1588
}
1589
} else {
1590
while(true){
1591
direntry = readdir(d);
1592
if(direntry == NULL){
1593
break;
1594
}
1595
/* Skip "." and ".." */
1596
if(direntry->d_name[0] == '.'
1597
and (direntry->d_name[1] == '\0'
1598
or (direntry->d_name[1] == '.'
1599
and direntry->d_name[2] == '\0'))){
1600
continue;
1601
}
1602
char *fullname = NULL;
1603
ret = asprintf(&fullname, "%s/%s", tempdir,
1604
direntry->d_name);
1605
if(ret < 0){
1606
perror("asprintf");
1607
continue;
1608
}
1609
ret = remove(fullname);
1610
if(ret == -1){
1611
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1612
strerror(errno));
1613
}
1614
free(fullname);
1615
}
1616
closedir(d);
1617
}
1618
ret = rmdir(tempdir);
1619
if(ret == -1 and errno != ENOENT){
1620
perror("rmdir");
1621
}
1622
}
1623
1624
if(quit_now){
1625
sigemptyset(&old_sigterm_action.sa_mask);
1626
old_sigterm_action.sa_handler = SIG_DFL;
1627
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
1628
&old_sigterm_action,
1629
NULL));
1630
if(ret == -1){
1631
perror("sigaction");
1632
}
1633
do {
1634
ret = raise(signal_received);
1635
} while(ret != 0 and errno == EINTR);
1636
if(ret != 0){
1637
perror("raise");
1638
abort();
1639
}
1640
TEMP_FAILURE_RETRY(pause());
1641
}
1642
1643
return exitcode;
768
1644
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0