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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:
- mandos-clients.conf => clients.conf
- server.py => mandos
- 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
/***
2
This file is part of avahi.
3
4
avahi is free software; you can redistribute it and/or modify it
5
under the terms of the GNU Lesser General Public License as
6
published by the Free Software Foundation; either version 2.1 of the
7
License, or (at your option) any later version.
8
9
avahi is distributed in the hope that it will be useful, but WITHOUT
10
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
11
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
12
Public License for more details.
13
14
You should have received a copy of the GNU Lesser General Public
15
License along with avahi; if not, write to the Free Software
16
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
17
USA.
18
***/
1
/* -*- coding: utf-8 -*- */
2
/*
3
* Mandos-client - get and decrypt data from a Mandos server
4
*
5
* This program is partly derived from an example program for an Avahi
6
* service browser, downloaded from
7
* <http://avahi.org/browser/examples/core-browse-services.c>. This
8
* includes the following functions: "resolve_callback",
9
* "browse_callback", and parts of "main".
10
*
11
* Everything else is
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
14
*
15
* This program is free software: you can redistribute it and/or
16
* modify it under the terms of the GNU General Public License as
17
* published by the Free Software Foundation, either version 3 of the
18
* License, or (at your option) any later version.
19
*
20
* This program is distributed in the hope that it will be useful, but
21
* WITHOUT ANY WARRANTY; without even the implied warranty of
22
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23
* General Public License for more details.
24
*
25
* You should have received a copy of the GNU General Public License
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
28
*
29
* Contact the authors at <mandos@fukt.bsnet.se>.
30
*/
19
31
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
20
34
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
21
37
#define _FILE_OFFSET_BITS 64
22
23
#include <stdio.h>
24
#include <assert.h>
25
#include <stdlib.h>
26
#include <time.h>
27
#include <net/if.h> /* if_nametoindex */
28
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_* */
29
95
#include <avahi-core/core.h>
30
96
#include <avahi-core/lookup.h>
31
97
#include <avahi-core/log.h>
33
99
#include <avahi-common/malloc.h>
34
100
#include <avahi-common/error.h>
35
101
36
//mandos client part
37
#include <sys/types.h> /* socket(), setsockopt(), inet_pton() */
38
#include <sys/socket.h> /* socket(), setsockopt(), struct sockaddr_in6, struct in6_addr, inet_pton() */
39
#include <gnutls/gnutls.h> /* ALL GNUTLS STUFF */
40
#include <gnutls/openpgp.h> /* gnutls with openpgp stuff */
41
42
#include <unistd.h> /* close() */
43
#include <netinet/in.h>
44
#include <stdbool.h> /* true */
45
#include <string.h> /* memset */
46
#include <arpa/inet.h> /* inet_pton() */
47
#include <iso646.h> /* not */
48
49
// gpgme
50
#include <errno.h> /* perror() */
51
#include <gpgme.h>
52
53
// getopt long
54
#include <getopt.h>
55
56
#ifndef CERT_ROOT
57
#define CERT_ROOT "/conf/conf.d/cryptkeyreq/"
58
#endif
59
#define CERTFILE CERT_ROOT "openpgp-client.txt"
60
#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
61
119
#define BUFFER_SIZE 256
62
#define DH_BITS 1024
120
121
#define PATHDIR "/conf/conf.d/mandos"
122
#define SECKEY "seckey.txt"
123
#define PUBKEY "pubkey.txt"
63
124
64
125
bool debug = false;
65
char *interface = "eth0";
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>";
66
129
130
/* Used for passing in values through the Avahi callback functions */
67
131
typedef struct {
68
gnutls_session_t session;
132
AvahiSimplePoll *simple_poll;
133
AvahiServer *server;
69
134
gnutls_certificate_credentials_t cred;
135
unsigned int dh_bits;
70
136
gnutls_dh_params_t dh_params;
71
} encrypted_session;
72
73
74
ssize_t gpg_packet_decrypt (char *packet, size_t packet_size, char **new_packet, char *homedir){
75
gpgme_data_t dh_crypto, dh_plain;
137
const char *priority;
76
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){
77
171
gpgme_error_t rc;
78
ssize_t ret;
79
size_t new_packet_capacity = 0;
80
size_t new_packet_length = 0;
81
172
gpgme_engine_info_t engine_info;
82
83
if (debug){
84
fprintf(stderr, "Attempting to decrypt password from gpg 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");
85
213
}
86
214
87
215
/* Init GPGME */
88
216
gpgme_check_version(NULL);
89
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
}
90
223
91
/* Set GPGME home directory */
92
rc = gpgme_get_engine_info (&engine_info);
93
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){
94
227
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
95
228
gpgme_strsource(rc), gpgme_strerror(rc));
96
return -1;
229
return false;
97
230
}
98
231
while(engine_info != NULL){
99
232
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
100
233
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
101
engine_info->file_name, homedir);
234
engine_info->file_name, tempdir);
102
235
break;
103
236
}
104
237
engine_info = engine_info->next;
105
238
}
106
239
if(engine_info == NULL){
107
fprintf(stderr, "Could not set home dir to %s\n", homedir);
108
return -1;
109
}
110
111
/* Create new GPGME data buffer from packet buffer */
112
rc = gpgme_data_new_from_mem(&dh_crypto, packet, packet_size, 0);
113
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){
114
280
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
115
281
gpgme_strsource(rc), gpgme_strerror(rc));
116
282
return -1;
118
284
119
285
/* Create new empty GPGME data buffer for the plaintext */
120
286
rc = gpgme_data_new(&dh_plain);
121
if (rc != GPG_ERR_NO_ERROR){
287
if(rc != GPG_ERR_NO_ERROR){
122
288
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
123
289
gpgme_strsource(rc), gpgme_strerror(rc));
124
return -1;
125
}
126
127
/* Create new GPGME "context" */
128
rc = gpgme_new(&ctx);
129
if (rc != GPG_ERR_NO_ERROR){
130
fprintf(stderr, "bad gpgme_new: %s: %s\n",
131
gpgme_strsource(rc), gpgme_strerror(rc));
132
return -1;
133
}
134
135
/* Decrypt data from the FILE pointer to the plaintext data buffer */
136
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
137
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){
138
298
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
139
299
gpgme_strsource(rc), gpgme_strerror(rc));
140
return -1;
141
}
142
143
if(debug){
144
fprintf(stderr, "decryption of gpg packet succeeded\n");
145
}
146
147
if (debug){
148
gpgme_decrypt_result_t result;
149
result = gpgme_op_decrypt_result(ctx);
150
if (result == NULL){
151
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
152
} else {
153
fprintf(stderr, "Unsupported algorithm: %s\n", result->unsupported_algorithm);
154
fprintf(stderr, "Wrong key usage: %d\n", result->wrong_key_usage);
155
if(result->file_name != NULL){
156
fprintf(stderr, "File name: %s\n", result->file_name);
157
}
158
gpgme_recipient_t recipient;
159
recipient = result->recipients;
160
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;
161
316
while(recipient != NULL){
162
317
fprintf(stderr, "Public key algorithm: %s\n",
163
318
gpgme_pubkey_algo_name(recipient->pubkey_algo));
164
319
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
165
320
fprintf(stderr, "Secret key available: %s\n",
166
recipient->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
321
recipient->status == GPG_ERR_NO_SECKEY
322
? "No" : "Yes");
167
323
recipient = recipient->next;
168
324
}
169
325
}
170
326
}
327
goto decrypt_end;
171
328
}
172
329
173
/* Delete the GPGME FILE pointer cryptotext data buffer */
174
gpgme_data_release(dh_crypto);
330
if(debug){
331
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
332
}
175
333
176
334
/* Seek back to the beginning of the GPGME plaintext data buffer */
177
gpgme_data_seek(dh_plain, 0, SEEK_SET);
178
179
*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;
180
342
while(true){
181
if (new_packet_length + BUFFER_SIZE > new_packet_capacity){
182
*new_packet = realloc(*new_packet, new_packet_capacity + BUFFER_SIZE);
183
if (*new_packet == NULL){
184
perror("realloc");
185
return -1;
186
}
187
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;
188
350
}
189
351
190
ret = gpgme_data_read(dh_plain, *new_packet + new_packet_length, BUFFER_SIZE);
352
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
353
BUFFER_SIZE);
191
354
/* Print the data, if any */
192
if (ret == 0){
193
/* If password is empty, then a incorrect error will be printed */
355
if(ret == 0){
356
/* EOF */
194
357
break;
195
358
}
196
359
if(ret < 0){
197
360
perror("gpgme_data_read");
198
return -1;
199
}
200
new_packet_length += ret;
201
}
202
203
/* FIXME: check characters before printing to screen so to not print
204
terminal control characters */
205
/* if(debug){ */
206
/* fprintf(stderr, "decrypted password is: "); */
207
/* fwrite(*new_packet, 1, new_packet_length, stderr); */
208
/* fprintf(stderr, "\n"); */
209
/* } */
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);
210
379
211
380
/* Delete the GPGME plaintext data buffer */
212
381
gpgme_data_release(dh_plain);
213
return new_packet_length;
382
return plaintext_length;
214
383
}
215
384
216
static const char * safer_gnutls_strerror (int value) {
217
const char *ret = gnutls_strerror (value);
218
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)
219
389
ret = "(unknown)";
220
390
return ret;
221
391
}
222
392
223
void debuggnutls(int level, const char* string){
224
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);
225
397
}
226
398
227
int initgnutls(encrypted_session *es){
228
const char *err;
399
static int init_gnutls_global(const char *pubkeyfilename,
400
const char *seckeyfilename){
229
401
int ret;
230
402
231
403
if(debug){
232
fprintf(stderr, "Initializing gnutls\n");
404
fprintf(stderr, "Initializing GnuTLS\n");
233
405
}
234
235
406
236
if ((ret = gnutls_global_init ())
237
!= GNUTLS_E_SUCCESS) {
238
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));
239
411
return -1;
240
412
}
241
242
if (debug){
413
414
if(debug){
415
/* "Use a log level over 10 to enable all debugging options."
416
* - GnuTLS manual
417
*/
243
418
gnutls_global_set_log_level(11);
244
419
gnutls_global_set_log_function(debuggnutls);
245
420
}
246
421
247
248
/* openpgp credentials */
249
if ((ret = gnutls_certificate_allocate_credentials (&es->cred))
250
!= GNUTLS_E_SUCCESS) {
251
fprintf (stderr, "memory error: %s\n", 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();
252
431
return -1;
253
432
}
254
433
255
434
if(debug){
256
fprintf(stderr, "Attempting to use openpgp certificate %s"
257
" and keyfile %s as gnutls credentials\n", CERTFILE, KEYFILE);
435
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
436
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
437
seckeyfilename);
258
438
}
259
439
260
440
ret = gnutls_certificate_set_openpgp_key_file
261
(es->cred, CERTFILE, KEYFILE, GNUTLS_OPENPGP_FMT_BASE64);
262
if (ret != GNUTLS_E_SUCCESS) {
263
fprintf
264
(stderr, "Error[%d] while reading the OpenPGP key pair ('%s', '%s')\n",
265
ret, CERTFILE, KEYFILE);
266
fprintf(stdout, "The Error is: %s\n",
267
safer_gnutls_strerror(ret));
268
return -1;
269
}
270
271
//Gnutls server initialization
272
if ((ret = gnutls_dh_params_init (&es->dh_params))
273
!= GNUTLS_E_SUCCESS) {
274
fprintf (stderr, "Error in dh parameter initialization: %s\n",
275
safer_gnutls_strerror(ret));
276
return -1;
277
}
278
279
if ((ret = gnutls_dh_params_generate2 (es->dh_params, DH_BITS))
280
!= GNUTLS_E_SUCCESS) {
281
fprintf (stderr, "Error in prime generation: %s\n",
282
safer_gnutls_strerror(ret));
283
return -1;
284
}
285
286
gnutls_certificate_set_dh_params (es->cred, es->dh_params);
287
288
// Gnutls session creation
289
if ((ret = gnutls_init (&es->session, GNUTLS_SERVER))
290
!= GNUTLS_E_SUCCESS){
291
fprintf(stderr, "Error in gnutls session initialization: %s\n",
292
safer_gnutls_strerror(ret));
293
}
294
295
if ((ret = gnutls_priority_set_direct (es->session, "NORMAL", &err))
296
!= GNUTLS_E_SUCCESS) {
297
fprintf(stderr, "Syntax error at: %s\n", err);
298
fprintf(stderr, "Gnutls error: %s\n",
299
safer_gnutls_strerror(ret));
300
return -1;
301
}
302
303
if ((ret = gnutls_credentials_set
304
(es->session, GNUTLS_CRD_CERTIFICATE, es->cred))
305
!= GNUTLS_E_SUCCESS) {
306
fprintf(stderr, "Error setting a credentials set: %s\n",
307
safer_gnutls_strerror(ret));
308
return -1;
309
}
310
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){
488
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
489
safer_gnutls_strerror(ret));
490
}
491
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
}
508
}
509
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",
520
safer_gnutls_strerror(ret));
521
gnutls_deinit(*session);
522
return -1;
523
}
524
311
525
/* ignore client certificate if any. */
312
gnutls_certificate_server_set_request (es->session, GNUTLS_CERT_IGNORE);
526
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
313
527
314
gnutls_dh_set_prime_bits (es->session, DH_BITS);
528
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
315
529
316
530
return 0;
317
531
}
318
532
319
void empty_log(AvahiLogLevel level, const char *txt){}
533
/* Avahi log function callback */
534
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
535
__attribute__((unused)) const char *txt){}
320
536
321
int start_mandos_communication(char *ip, uint16_t port){
322
int ret, tcp_sd;
323
struct sockaddr_in6 to;
324
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;
325
547
char *buffer = NULL;
326
char *decrypted_buffer;
548
char *decrypted_buffer = NULL;
327
549
size_t buffer_length = 0;
328
550
size_t buffer_capacity = 0;
329
ssize_t decrypted_buffer_size;
330
int retval = 0;
331
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
}
576
332
577
if(debug){
333
fprintf(stderr, "Setting up a tcp connection to %s\n", ip);
578
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
579
"\n", ip, port);
334
580
}
335
581
336
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
337
if(tcp_sd < 0) {
582
tcp_sd = socket(pf, SOCK_STREAM, 0);
583
if(tcp_sd < 0){
338
584
perror("socket");
339
return -1;
340
}
341
342
if(debug){
343
fprintf(stderr, "Binding to interface %s\n", interface);
344
}
345
346
ret = setsockopt(tcp_sd, SOL_SOCKET, SO_BINDTODEVICE, interface, 5);
347
if(tcp_sd < 0) {
348
perror("setsockopt bindtodevice");
349
return -1;
350
}
351
352
memset(&to,0,sizeof(to));
353
to.sin6_family = AF_INET6;
354
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
355
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 ){
356
601
perror("inet_pton");
357
return -1;
358
}
602
goto mandos_end;
603
}
359
604
if(ret == 0){
360
605
fprintf(stderr, "Bad address: %s\n", ip);
361
return -1;
362
}
363
to.sin6_port = htons(port);
364
to.sin6_scope_id = if_nametoindex(interface);
365
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
}
629
630
if(quit_now){
631
goto mandos_end;
632
}
633
366
634
if(debug){
367
fprintf(stderr, "Connection to: %s\n", ip);
368
}
369
370
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
371
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){
372
676
perror("connect");
373
return -1;
374
}
375
376
ret = initgnutls (&es);
377
if (ret != 0){
378
retval = -1;
379
return -1;
380
}
381
382
383
gnutls_transport_set_ptr (es.session, (gnutls_transport_ptr_t) tcp_sd);
384
385
if(debug){
386
fprintf(stderr, "Establishing tls session with %s\n", ip);
387
}
388
389
390
ret = gnutls_handshake (es.session);
391
392
if (ret != GNUTLS_E_SUCCESS){
393
fprintf(stderr, "\n*** Handshake failed ***\n");
394
gnutls_perror (ret);
395
retval = -1;
396
goto exit;
397
}
398
399
//Retrieve gpg packet that contains the wanted password
400
401
if(debug){
402
fprintf(stderr, "Retrieving pgp encrypted password from %s\n", ip);
403
}
404
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;
405
686
while(true){
406
if (buffer_length + BUFFER_SIZE > buffer_capacity){
407
buffer = realloc(buffer, buffer_capacity + BUFFER_SIZE);
408
if (buffer == NULL){
409
perror("realloc");
410
goto exit;
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;
411
703
}
412
buffer_capacity += BUFFER_SIZE;
413
}
414
415
ret = gnutls_record_recv
416
(es.session, buffer+buffer_length, BUFFER_SIZE);
417
if (ret == 0){
704
}
705
706
if(quit_now){
707
goto mandos_end;
708
}
709
}
710
711
if(debug){
712
fprintf(stderr, "Establishing TLS session with %s\n", ip);
713
}
714
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){
733
if(debug){
734
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
735
gnutls_perror(ret);
736
}
737
goto mandos_end;
738
}
739
740
/* Read OpenPGP packet that contains the wanted password */
741
742
if(debug){
743
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
744
ip);
745
}
746
747
while(true){
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){
418
767
break;
419
768
}
420
if (ret < 0){
421
switch(ret){
769
if(sret < 0){
770
switch(sret){
422
771
case GNUTLS_E_INTERRUPTED:
423
772
case GNUTLS_E_AGAIN:
424
773
break;
425
774
case GNUTLS_E_REHANDSHAKE:
426
ret = gnutls_handshake (es.session);
427
if (ret < 0){
428
fprintf(stderr, "\n*** Handshake failed ***\n");
429
gnutls_perror (ret);
430
retval = -1;
431
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;
432
786
}
433
787
break;
434
788
default:
435
fprintf(stderr, "Unknown error while reading data from encrypted session with mandos server\n");
436
retval = -1;
437
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
438
goto exit;
789
fprintf(stderr, "Unknown error while reading data from"
790
" encrypted session with Mandos server\n");
791
gnutls_bye(session, GNUTLS_SHUT_RDWR);
792
goto mandos_end;
439
793
}
440
794
} else {
441
buffer_length += ret;
795
buffer_length += (size_t) sret;
442
796
}
443
797
}
444
798
445
if (buffer_length > 0){
446
if ((decrypted_buffer_size = gpg_packet_decrypt(buffer, buffer_length, &decrypted_buffer, CERT_ROOT)) >= 0){
447
fwrite (decrypted_buffer, 1, decrypted_buffer_size, stdout);
448
free(decrypted_buffer);
449
} else {
450
retval = -1;
451
}
452
}
453
454
//shutdown procedure
455
456
799
if(debug){
457
fprintf(stderr, "Closing tls session\n");
458
}
459
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;
816
decrypted_buffer_size = pgp_packet_decrypt(buffer,
817
buffer_length,
818
&decrypted_buffer);
819
if(decrypted_buffer_size >= 0){
820
821
written = 0;
822
while(written < (size_t) decrypted_buffer_size){
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);
830
if(ret == 0 and ferror(stdout)){
831
if(debug){
832
fprintf(stderr, "Error writing encrypted data: %s\n",
833
strerror(errno));
834
}
835
goto mandos_end;
836
}
837
written += (size_t)ret;
838
}
839
retval = 0;
840
}
841
}
842
843
/* Shutdown procedure */
844
845
mandos_end:
846
free(decrypted_buffer);
460
847
free(buffer);
461
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
462
exit:
463
close(tcp_sd);
464
gnutls_deinit (es.session);
465
gnutls_certificate_free_credentials (es.cred);
466
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
}
467
858
return retval;
468
859
}
469
860
470
static AvahiSimplePoll *simple_poll = NULL;
471
static AvahiServer *server = NULL;
472
473
static void resolve_callback(
474
AvahiSServiceResolver *r,
475
AVAHI_GCC_UNUSED AvahiIfIndex interface,
476
AVAHI_GCC_UNUSED AvahiProtocol protocol,
477
AvahiResolverEvent event,
478
const char *name,
479
const char *type,
480
const char *domain,
481
const char *host_name,
482
const AvahiAddress *address,
483
uint16_t port,
484
AvahiStringList *txt,
485
AvahiLookupResultFlags flags,
486
AVAHI_GCC_UNUSED void* userdata) {
487
488
assert(r);
489
490
/* Called whenever a service has been resolved successfully or timed out */
491
492
switch (event) {
493
case AVAHI_RESOLVER_FAILURE:
494
fprintf(stderr, "(Resolver) Failed to resolve service '%s' of type '%s' in domain '%s': %s\n", name, type, domain, avahi_strerror(avahi_server_errno(server)));
495
break;
496
497
case AVAHI_RESOLVER_FOUND: {
498
char ip[AVAHI_ADDRESS_STR_MAX];
499
avahi_address_snprint(ip, sizeof(ip), address);
500
if(debug){
501
fprintf(stderr, "Mandos server found at %s on port %d\n", ip, port);
502
}
503
int ret = start_mandos_communication(ip, port);
504
if (ret == 0){
505
exit(EXIT_SUCCESS);
506
} else {
507
exit(EXIT_FAILURE);
508
}
509
}
510
}
511
avahi_s_service_resolver_free(r);
512
}
513
514
static void browse_callback(
515
AvahiSServiceBrowser *b,
516
AvahiIfIndex interface,
517
AvahiProtocol protocol,
518
AvahiBrowserEvent event,
519
const char *name,
520
const char *type,
521
const char *domain,
522
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
523
void* userdata) {
524
525
AvahiServer *s = userdata;
526
assert(b);
527
528
/* Called whenever a new services becomes available on the LAN or is removed from the LAN */
529
530
switch (event) {
531
532
case AVAHI_BROWSER_FAILURE:
533
534
fprintf(stderr, "(Browser) %s\n", avahi_strerror(avahi_server_errno(server)));
535
avahi_simple_poll_quit(simple_poll);
536
return;
537
538
case AVAHI_BROWSER_NEW:
539
/* We ignore the returned resolver object. In the callback
540
function we free it. If the server is terminated before
541
the callback function is called the server will free
542
the resolver for us. */
543
544
if (!(avahi_s_service_resolver_new(s, interface, protocol, name, type, domain, AVAHI_PROTO_INET6, 0, resolve_callback, s)))
545
fprintf(stderr, "Failed to resolve service '%s': %s\n", name, avahi_strerror(avahi_server_errno(s)));
546
547
break;
548
549
case AVAHI_BROWSER_REMOVE:
550
break;
551
552
case AVAHI_BROWSER_ALL_FOR_NOW:
553
case AVAHI_BROWSER_CACHE_EXHAUSTED:
554
break;
555
}
556
}
557
558
int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
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);
876
877
/* Called whenever a service has been resolved successfully or
878
timed out */
879
880
if(quit_now){
881
return;
882
}
883
884
switch(event){
885
default:
886
case AVAHI_RESOLVER_FAILURE:
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)));
890
break;
891
892
case AVAHI_RESOLVER_FOUND:
893
{
894
char ip[AVAHI_ADDRESS_STR_MAX];
895
avahi_address_snprint(ip, sizeof(ip), address);
896
if(debug){
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);
900
}
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);
905
}
906
}
907
}
908
avahi_s_service_resolver_free(r);
909
}
910
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:
1140
default:
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);
1232
if(if_index == 0){
1233
fprintf(stderr, "No such interface: \"%s\"\n", interface);
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
{
559
1470
AvahiServerConfig config;
560
AvahiSServiceBrowser *sb = NULL;
561
int error;
562
int ret;
563
int returncode = EXIT_SUCCESS;
564
565
while (true){
566
static struct option long_options[] = {
567
{"debug", no_argument, (int *)&debug, 1},
568
{"interface", required_argument, 0, 'i'},
569
{0, 0, 0, 0} };
570
571
int option_index = 0;
572
ret = getopt_long (argc, argv, "i:", long_options, &option_index);
573
574
if (ret == -1){
575
break;
576
}
577
578
switch(ret){
579
case 0:
580
break;
581
case 'i':
582
interface = optarg;
583
break;
584
default:
585
exit(EXIT_FAILURE);
586
}
587
}
588
589
if (not debug){
590
avahi_set_log_function(empty_log);
591
}
592
593
/* Initialize the psuedo-RNG */
594
srand(time(NULL));
595
596
/* Allocate main loop object */
597
if (!(simple_poll = avahi_simple_poll_new())) {
598
fprintf(stderr, "Failed to create simple poll object.\n");
599
600
goto exit;
601
}
602
603
/* Do not publish any local records */
1471
/* Do not publish any local Zeroconf records */
604
1472
avahi_server_config_init(&config);
605
1473
config.publish_hinfo = 0;
606
1474
config.publish_addresses = 0;
607
1475
config.publish_workstation = 0;
608
1476
config.publish_domain = 0;
609
1477
610
1478
/* Allocate a new server */
611
server = avahi_server_new(avahi_simple_poll_get(simple_poll), &config, NULL, NULL, &error);
612
613
/* 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 */
614
1484
avahi_server_config_free(&config);
615
616
/* Check if creating the server object succeeded */
617
if (!server) {
618
fprintf(stderr, "Failed to create server: %s\n", avahi_strerror(error));
619
returncode = EXIT_FAILURE;
620
goto exit;
621
}
622
623
/* Create the service browser */
624
if (!(sb = avahi_s_service_browser_new(server, if_nametoindex("eth0"), AVAHI_PROTO_INET6, "_mandos._tcp", NULL, 0, browse_callback, server))) {
625
fprintf(stderr, "Failed to create service browser: %s\n", avahi_strerror(avahi_server_errno(server)));
626
returncode = EXIT_FAILURE;
627
goto exit;
628
}
629
630
/* Run the main loop */
631
632
if (debug){
633
fprintf(stderr, "Starting avahi loop search\n");
634
}
635
636
avahi_simple_poll_loop(simple_poll);
637
638
exit:
639
640
if (debug){
641
fprintf(stderr, "%s exiting\n", argv[0]);
642
}
643
644
/* Cleanup things */
645
if (sb)
646
avahi_s_service_browser_free(sb);
647
648
if (server)
649
avahi_server_free(server);
650
651
if (simple_poll)
652
avahi_simple_poll_free(simple_poll);
653
654
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;
655
1644
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0