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- Committer: Teddy Hogeborn
- Date: 2008-08-03 01:09:36 UTC
- mfrom: (24.1.9 mandos)
- Revision ID: teddy@fukt.bsnet.se-20080803010936-ujme8tgxceszfbi1
* plugbasedclient.c (main): New "--userid" and "--groupid" options.
Take an additional non-option argument and
parse it as a plus-separated and -prefixed
list of additional options.
* plugins.d/mandosclient.c (DH_BITS): Replaced with
"mandos_context.dh_bits". All
users changed.
(certdir): Renamed to "keydir". All users changed.
(certfile): Renamed to "pubkeyfile". All users changed.
(certkey): Renamed to "seckeyfile". All users changed.
(encrypted_session): Replaced with "mandos_context". All users
changed.
(initgnutls): Take additional "session" and "dh_params" arguments.
All callers changed.
(start_mandos_communication): Take additional "mc" argument. All
callers changed. Print target IPv6
address if different than supplied
string.
(simple_poll) Replaced with "mandos_context.simple_poll". All users
changed.
(server): Replaced with "mandos_context.server". All users changed.
(main): Default interface to "eth0". Rename "--certdir" to
"--keydir", "--certkey" to "--seckey", and "--certfile" to
"--pubkey". New options "--dh-bits" and "--priority". If
the interface is not up, bring it up.
Take an additional non-option argument and
parse it as a plus-separated and -prefixed
list of additional options.
* plugins.d/mandosclient.c (DH_BITS): Replaced with
"mandos_context.dh_bits". All
users changed.
(certdir): Renamed to "keydir". All users changed.
(certfile): Renamed to "pubkeyfile". All users changed.
(certkey): Renamed to "seckeyfile". All users changed.
(encrypted_session): Replaced with "mandos_context". All users
changed.
(initgnutls): Take additional "session" and "dh_params" arguments.
All callers changed.
(start_mandos_communication): Take additional "mc" argument. All
callers changed. Print target IPv6
address if different than supplied
string.
(simple_poll) Replaced with "mandos_context.simple_poll". All users
changed.
(server): Replaced with "mandos_context.server". All users changed.
(main): Default interface to "eth0". Rename "--certdir" to
"--keydir", "--certkey" to "--seckey", and "--certfile" to
"--pubkey". New options "--dh-bits" and "--priority". If
the interface is not up, bring it up.
- files added:
- ca.pem
- files removed:
- .bzr-builddeb
- debian
- debian/po
- files renamed:
- plugin-runner.c => plugbasedclient.c
- plugins.d/mandos-client.c => plugins.d/mandosclient.c
- plugins.d/password-prompt.c => plugins.d/passprompt.c
- mandos.conf => server.conf
- mandos => server.py
- files modified:
- Makefile
added
removed
plugins.d/mandosclient.c
1
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
* Mandos-client - get and decrypt data from a Mandos server
3
* Mandos client - get and decrypt data from a Mandos server
4
4
*
5
5
* This program is partly derived from an example program for an Avahi
6
6
* service browser, downloaded from
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
12
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
14
13
*
15
14
* This program is free software: you can redistribute it and/or
16
15
* modify it under the terms of the GNU General Public License as
33
32
#define _LARGEFILE_SOURCE
34
33
#define _FILE_OFFSET_BITS 64
35
34
36
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
37
38
#include <stdio.h> /* fprintf(), stderr, fwrite(),
39
stdout, ferror(), sscanf(),
40
remove() */
41
#include <stdint.h> /* uint16_t, uint32_t */
42
#include <stddef.h> /* NULL, size_t, ssize_t */
43
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
44
srand() */
45
#include <stdbool.h> /* bool, false, true */
46
#include <string.h> /* memset(), strcmp(), strlen(),
47
strerror(), asprintf(), strcpy() */
48
#include <sys/ioctl.h> /* ioctl */
49
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
50
sockaddr_in6, PF_INET6,
51
SOCK_STREAM, uid_t, gid_t, open(),
52
opendir(), DIR */
53
#include <sys/stat.h> /* open() */
54
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
55
inet_pton(), connect() */
56
#include <fcntl.h> /* open() */
57
#include <dirent.h> /* opendir(), struct dirent, readdir()
58
*/
59
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
60
#include <assert.h> /* assert() */
61
#include <errno.h> /* perror(), errno */
62
#include <time.h> /* nanosleep(), time() */
63
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
64
SIOCSIFFLAGS, if_indextoname(),
65
if_nametoindex(), IF_NAMESIZE */
66
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
67
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
68
*/
69
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
70
getuid(), getgid(), setuid(),
71
setgid() */
72
#include <arpa/inet.h> /* inet_pton(), htons */
73
#include <iso646.h> /* not, or, and */
74
#include <argp.h> /* struct argp_option, error_t, struct
75
argp_state, struct argp,
76
argp_parse(), ARGP_KEY_ARG,
77
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
78
#ifdef __linux__
79
#include <sys/klog.h> /* klogctl() */
80
#endif
81
82
/* Avahi */
83
/* All Avahi types, constants and functions
84
Avahi*, avahi_*,
85
AVAHI_* */
35
#include <stdio.h>
36
#include <assert.h>
37
#include <stdlib.h>
38
#include <time.h>
39
#include <net/if.h> /* if_nametoindex */
40
#include <sys/ioctl.h> // ioctl, ifreq, SIOCGIFFLAGS, IFF_UP, SIOCSIFFLAGS
41
#include <net/if.h> // ioctl, ifreq, SIOCGIFFLAGS, IFF_UP, SIOCSIFFLAGS
42
86
43
#include <avahi-core/core.h>
87
44
#include <avahi-core/lookup.h>
88
45
#include <avahi-core/log.h>
90
47
#include <avahi-common/malloc.h>
91
48
#include <avahi-common/error.h>
92
49
93
/* GnuTLS */
94
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
95
functions:
96
gnutls_*
97
init_gnutls_session(),
98
GNUTLS_* */
99
#include <gnutls/openpgp.h>
100
/* gnutls_certificate_set_openpgp_key_file(),
101
GNUTLS_OPENPGP_FMT_BASE64 */
102
103
/* GPGME */
104
#include <gpgme.h> /* All GPGME types, constants and
105
functions:
106
gpgme_*
107
GPGME_PROTOCOL_OpenPGP,
108
GPG_ERR_NO_* */
50
//mandos client part
51
#include <sys/types.h> /* socket(), inet_pton() */
52
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
53
struct in6_addr, inet_pton() */
54
#include <gnutls/gnutls.h> /* All GnuTLS stuff */
55
#include <gnutls/openpgp.h> /* GnuTLS with openpgp stuff */
56
57
#include <unistd.h> /* close() */
58
#include <netinet/in.h>
59
#include <stdbool.h> /* true */
60
#include <string.h> /* memset */
61
#include <arpa/inet.h> /* inet_pton() */
62
#include <iso646.h> /* not */
63
64
// gpgme
65
#include <errno.h> /* perror() */
66
#include <gpgme.h>
67
68
// getopt_long
69
#include <getopt.h>
109
70
110
71
#define BUFFER_SIZE 256
111
72
112
#define PATHDIR "/conf/conf.d/mandos"
113
#define SECKEY "seckey.txt"
114
#define PUBKEY "pubkey.txt"
73
static const char *keydir = "/conf/conf.d/mandos";
74
static const char *pubkeyfile = "pubkey.txt";
75
static const char *seckeyfile = "seckey.txt";
115
76
116
77
bool debug = false;
117
static const char mandos_protocol_version[] = "1";
118
const char *argp_program_version = "mandos-client " VERSION;
119
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
120
78
121
/* Used for passing in values through the Avahi callback functions */
79
/* Used for passing in values through all the callback functions */
122
80
typedef struct {
123
81
AvahiSimplePoll *simple_poll;
124
82
AvahiServer *server;
125
83
gnutls_certificate_credentials_t cred;
126
84
unsigned int dh_bits;
127
gnutls_dh_params_t dh_params;
128
85
const char *priority;
86
} mandos_context;
87
88
static ssize_t pgp_packet_decrypt (char *packet, size_t packet_size,
89
char **new_packet,
90
const char *homedir){
91
gpgme_data_t dh_crypto, dh_plain;
129
92
gpgme_ctx_t ctx;
130
} mandos_context;
131
132
/*
133
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
134
* "buffer_capacity" is how much is currently allocated,
135
* "buffer_length" is how much is already used.
136
*/
137
size_t adjustbuffer(char **buffer, size_t buffer_length,
138
size_t buffer_capacity){
139
if(buffer_length + BUFFER_SIZE > buffer_capacity){
140
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
141
if(buffer == NULL){
142
return 0;
143
}
144
buffer_capacity += BUFFER_SIZE;
145
}
146
return buffer_capacity;
147
}
148
149
/*
150
* Initialize GPGME.
151
*/
152
static bool init_gpgme(mandos_context *mc, const char *seckey,
153
const char *pubkey, const char *tempdir){
154
int ret;
155
93
gpgme_error_t rc;
94
ssize_t ret;
95
ssize_t new_packet_capacity = 0;
96
ssize_t new_packet_length = 0;
156
97
gpgme_engine_info_t engine_info;
157
158
159
/*
160
* Helper function to insert pub and seckey to the engine keyring.
161
*/
162
bool import_key(const char *filename){
163
int fd;
164
gpgme_data_t pgp_data;
165
166
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
167
if(fd == -1){
168
perror("open");
169
return false;
170
}
171
172
rc = gpgme_data_new_from_fd(&pgp_data, fd);
173
if(rc != GPG_ERR_NO_ERROR){
174
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
175
gpgme_strsource(rc), gpgme_strerror(rc));
176
return false;
177
}
178
179
rc = gpgme_op_import(mc->ctx, pgp_data);
180
if(rc != GPG_ERR_NO_ERROR){
181
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
182
gpgme_strsource(rc), gpgme_strerror(rc));
183
return false;
184
}
185
186
ret = (int)TEMP_FAILURE_RETRY(close(fd));
187
if(ret == -1){
188
perror("close");
189
}
190
gpgme_data_release(pgp_data);
191
return true;
192
}
193
194
if(debug){
195
fprintf(stderr, "Initialize gpgme\n");
98
99
if (debug){
100
fprintf(stderr, "Trying to decrypt OpenPGP packet\n");
196
101
}
197
102
198
103
/* Init GPGME */
199
104
gpgme_check_version(NULL);
200
105
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
201
if(rc != GPG_ERR_NO_ERROR){
106
if (rc != GPG_ERR_NO_ERROR){
202
107
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
203
108
gpgme_strsource(rc), gpgme_strerror(rc));
204
return false;
109
return -1;
205
110
}
206
111
207
/* Set GPGME home directory for the OpenPGP engine only */
208
rc = gpgme_get_engine_info(&engine_info);
209
if(rc != GPG_ERR_NO_ERROR){
112
/* Set GPGME home directory */
113
rc = gpgme_get_engine_info (&engine_info);
114
if (rc != GPG_ERR_NO_ERROR){
210
115
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
211
116
gpgme_strsource(rc), gpgme_strerror(rc));
212
return false;
117
return -1;
213
118
}
214
119
while(engine_info != NULL){
215
120
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
216
121
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
217
engine_info->file_name, tempdir);
122
engine_info->file_name, homedir);
218
123
break;
219
124
}
220
125
engine_info = engine_info->next;
221
126
}
222
127
if(engine_info == NULL){
223
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
224
return false;
225
}
226
227
/* Create new GPGME "context" */
228
rc = gpgme_new(&(mc->ctx));
229
if(rc != GPG_ERR_NO_ERROR){
230
fprintf(stderr, "bad gpgme_new: %s: %s\n",
231
gpgme_strsource(rc), gpgme_strerror(rc));
232
return false;
233
}
234
235
if(not import_key(pubkey) or not import_key(seckey)){
236
return false;
237
}
238
239
return true;
240
}
241
242
/*
243
* Decrypt OpenPGP data.
244
* Returns -1 on error
245
*/
246
static ssize_t pgp_packet_decrypt(const mandos_context *mc,
247
const char *cryptotext,
248
size_t crypto_size,
249
char **plaintext){
250
gpgme_data_t dh_crypto, dh_plain;
251
gpgme_error_t rc;
252
ssize_t ret;
253
size_t plaintext_capacity = 0;
254
ssize_t plaintext_length = 0;
255
256
if(debug){
257
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
258
}
259
260
/* Create new GPGME data buffer from memory cryptotext */
261
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
262
0);
263
if(rc != GPG_ERR_NO_ERROR){
128
fprintf(stderr, "Could not set home dir to %s\n", homedir);
129
return -1;
130
}
131
132
/* Create new GPGME data buffer from packet buffer */
133
rc = gpgme_data_new_from_mem(&dh_crypto, packet, packet_size, 0);
134
if (rc != GPG_ERR_NO_ERROR){
264
135
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
265
136
gpgme_strsource(rc), gpgme_strerror(rc));
266
137
return -1;
268
139
269
140
/* Create new empty GPGME data buffer for the plaintext */
270
141
rc = gpgme_data_new(&dh_plain);
271
if(rc != GPG_ERR_NO_ERROR){
142
if (rc != GPG_ERR_NO_ERROR){
272
143
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
273
144
gpgme_strsource(rc), gpgme_strerror(rc));
274
gpgme_data_release(dh_crypto);
275
return -1;
276
}
277
278
/* Decrypt data from the cryptotext data buffer to the plaintext
279
data buffer */
280
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
281
if(rc != GPG_ERR_NO_ERROR){
145
return -1;
146
}
147
148
/* Create new GPGME "context" */
149
rc = gpgme_new(&ctx);
150
if (rc != GPG_ERR_NO_ERROR){
151
fprintf(stderr, "bad gpgme_new: %s: %s\n",
152
gpgme_strsource(rc), gpgme_strerror(rc));
153
return -1;
154
}
155
156
/* Decrypt data from the FILE pointer to the plaintext data
157
buffer */
158
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
159
if (rc != GPG_ERR_NO_ERROR){
282
160
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
283
161
gpgme_strsource(rc), gpgme_strerror(rc));
284
plaintext_length = -1;
285
if(debug){
286
gpgme_decrypt_result_t result;
287
result = gpgme_op_decrypt_result(mc->ctx);
288
if(result == NULL){
289
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
290
} else {
291
fprintf(stderr, "Unsupported algorithm: %s\n",
292
result->unsupported_algorithm);
293
fprintf(stderr, "Wrong key usage: %u\n",
294
result->wrong_key_usage);
295
if(result->file_name != NULL){
296
fprintf(stderr, "File name: %s\n", result->file_name);
297
}
298
gpgme_recipient_t recipient;
299
recipient = result->recipients;
300
if(recipient){
301
while(recipient != NULL){
302
fprintf(stderr, "Public key algorithm: %s\n",
303
gpgme_pubkey_algo_name(recipient->pubkey_algo));
304
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
305
fprintf(stderr, "Secret key available: %s\n",
306
recipient->status == GPG_ERR_NO_SECKEY
307
? "No" : "Yes");
308
recipient = recipient->next;
309
}
162
return -1;
163
}
164
165
if(debug){
166
fprintf(stderr, "Decryption of OpenPGP packet succeeded\n");
167
}
168
169
if (debug){
170
gpgme_decrypt_result_t result;
171
result = gpgme_op_decrypt_result(ctx);
172
if (result == NULL){
173
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
174
} else {
175
fprintf(stderr, "Unsupported algorithm: %s\n",
176
result->unsupported_algorithm);
177
fprintf(stderr, "Wrong key usage: %d\n",
178
result->wrong_key_usage);
179
if(result->file_name != NULL){
180
fprintf(stderr, "File name: %s\n", result->file_name);
181
}
182
gpgme_recipient_t recipient;
183
recipient = result->recipients;
184
if(recipient){
185
while(recipient != NULL){
186
fprintf(stderr, "Public key algorithm: %s\n",
187
gpgme_pubkey_algo_name(recipient->pubkey_algo));
188
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
189
fprintf(stderr, "Secret key available: %s\n",
190
recipient->status == GPG_ERR_NO_SECKEY
191
? "No" : "Yes");
192
recipient = recipient->next;
310
193
}
311
194
}
312
195
}
313
goto decrypt_end;
314
196
}
315
197
316
if(debug){
317
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
318
}
198
/* Delete the GPGME FILE pointer cryptotext data buffer */
199
gpgme_data_release(dh_crypto);
319
200
320
201
/* Seek back to the beginning of the GPGME plaintext data buffer */
321
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
322
perror("gpgme_data_seek");
323
plaintext_length = -1;
324
goto decrypt_end;
202
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
203
perror("pgpme_data_seek");
325
204
}
326
205
327
*plaintext = NULL;
206
*new_packet = 0;
328
207
while(true){
329
plaintext_capacity = adjustbuffer(plaintext,
330
(size_t)plaintext_length,
331
plaintext_capacity);
332
if(plaintext_capacity == 0){
333
perror("adjustbuffer");
334
plaintext_length = -1;
335
goto decrypt_end;
208
if (new_packet_length + BUFFER_SIZE > new_packet_capacity){
209
*new_packet = realloc(*new_packet,
210
(unsigned int)new_packet_capacity
211
+ BUFFER_SIZE);
212
if (*new_packet == NULL){
213
perror("realloc");
214
return -1;
215
}
216
new_packet_capacity += BUFFER_SIZE;
336
217
}
337
218
338
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
219
ret = gpgme_data_read(dh_plain, *new_packet + new_packet_length,
339
220
BUFFER_SIZE);
340
221
/* Print the data, if any */
341
if(ret == 0){
342
/* EOF */
222
if (ret == 0){
343
223
break;
344
224
}
345
225
if(ret < 0){
346
226
perror("gpgme_data_read");
347
plaintext_length = -1;
348
goto decrypt_end;
349
}
350
plaintext_length += ret;
351
}
352
353
if(debug){
354
fprintf(stderr, "Decrypted password is: ");
355
for(ssize_t i = 0; i < plaintext_length; i++){
356
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
357
}
358
fprintf(stderr, "\n");
359
}
360
361
decrypt_end:
362
363
/* Delete the GPGME cryptotext data buffer */
364
gpgme_data_release(dh_crypto);
227
return -1;
228
}
229
new_packet_length += ret;
230
}
231
232
/* FIXME: check characters before printing to screen so to not print
233
terminal control characters */
234
/* if(debug){ */
235
/* fprintf(stderr, "decrypted password is: "); */
236
/* fwrite(*new_packet, 1, new_packet_length, stderr); */
237
/* fprintf(stderr, "\n"); */
238
/* } */
365
239
366
240
/* Delete the GPGME plaintext data buffer */
367
241
gpgme_data_release(dh_plain);
368
return plaintext_length;
242
return new_packet_length;
369
243
}
370
244
371
static const char * safer_gnutls_strerror(int value){
372
const char *ret = gnutls_strerror(value); /* Spurious warning from
373
-Wunreachable-code */
374
if(ret == NULL)
245
static const char * safer_gnutls_strerror (int value) {
246
const char *ret = gnutls_strerror (value);
247
if (ret == NULL)
375
248
ret = "(unknown)";
376
249
return ret;
377
250
}
378
251
379
/* GnuTLS log function callback */
380
252
static void debuggnutls(__attribute__((unused)) int level,
381
253
const char* string){
382
fprintf(stderr, "GnuTLS: %s", string);
254
fprintf(stderr, "%s", string);
383
255
}
384
256
385
static int init_gnutls_global(mandos_context *mc,
386
const char *pubkeyfilename,
387
const char *seckeyfilename){
257
static int initgnutls(mandos_context *mc, gnutls_session_t *session,
258
gnutls_dh_params_t *dh_params){
259
const char *err;
388
260
int ret;
389
261
390
262
if(debug){
391
263
fprintf(stderr, "Initializing GnuTLS\n");
392
264
}
393
394
ret = gnutls_global_init();
395
if(ret != GNUTLS_E_SUCCESS){
396
fprintf(stderr, "GnuTLS global_init: %s\n",
397
safer_gnutls_strerror(ret));
265
266
if ((ret = gnutls_global_init ())
267
!= GNUTLS_E_SUCCESS) {
268
fprintf (stderr, "global_init: %s\n", safer_gnutls_strerror(ret));
398
269
return -1;
399
270
}
400
271
401
if(debug){
402
/* "Use a log level over 10 to enable all debugging options."
403
* - GnuTLS manual
404
*/
272
if (debug){
405
273
gnutls_global_set_log_level(11);
406
274
gnutls_global_set_log_function(debuggnutls);
407
275
}
408
276
409
/* OpenPGP credentials */
410
gnutls_certificate_allocate_credentials(&mc->cred);
411
if(ret != GNUTLS_E_SUCCESS){
412
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
413
from
414
-Wunreachable-code
415
*/
416
safer_gnutls_strerror(ret));
417
gnutls_global_deinit();
277
/* openpgp credentials */
278
if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))
279
!= GNUTLS_E_SUCCESS) {
280
fprintf (stderr, "memory error: %s\n",
281
safer_gnutls_strerror(ret));
418
282
return -1;
419
283
}
420
284
421
285
if(debug){
422
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
423
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
424
seckeyfilename);
286
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
287
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
288
seckeyfile);
425
289
}
426
290
427
291
ret = gnutls_certificate_set_openpgp_key_file
428
(mc->cred, pubkeyfilename, seckeyfilename,
429
GNUTLS_OPENPGP_FMT_BASE64);
430
if(ret != GNUTLS_E_SUCCESS){
431
fprintf(stderr,
432
"Error[%d] while reading the OpenPGP key pair ('%s',"
433
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
434
fprintf(stderr, "The GnuTLS error is: %s\n",
435
safer_gnutls_strerror(ret));
436
goto globalfail;
437
}
438
439
/* GnuTLS server initialization */
440
ret = gnutls_dh_params_init(&mc->dh_params);
441
if(ret != GNUTLS_E_SUCCESS){
442
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
443
" %s\n", safer_gnutls_strerror(ret));
444
goto globalfail;
445
}
446
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
447
if(ret != GNUTLS_E_SUCCESS){
448
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
449
safer_gnutls_strerror(ret));
450
goto globalfail;
451
}
452
453
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
454
455
return 0;
456
457
globalfail:
458
459
gnutls_certificate_free_credentials(mc->cred);
460
gnutls_global_deinit();
461
gnutls_dh_params_deinit(mc->dh_params);
462
return -1;
463
}
464
465
static int init_gnutls_session(mandos_context *mc,
466
gnutls_session_t *session){
467
int ret;
468
/* GnuTLS session creation */
469
ret = gnutls_init(session, GNUTLS_SERVER);
470
if(ret != GNUTLS_E_SUCCESS){
292
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
293
if (ret != GNUTLS_E_SUCCESS) {
294
fprintf
295
(stderr, "Error[%d] while reading the OpenPGP key pair ('%s',"
296
" '%s')\n",
297
ret, pubkeyfile, seckeyfile);
298
fprintf(stdout, "The Error is: %s\n",
299
safer_gnutls_strerror(ret));
300
return -1;
301
}
302
303
//GnuTLS server initialization
304
if ((ret = gnutls_dh_params_init(dh_params))
305
!= GNUTLS_E_SUCCESS) {
306
fprintf (stderr, "Error in dh parameter initialization: %s\n",
307
safer_gnutls_strerror(ret));
308
return -1;
309
}
310
311
if ((ret = gnutls_dh_params_generate2(*dh_params, mc->dh_bits))
312
!= GNUTLS_E_SUCCESS) {
313
fprintf (stderr, "Error in prime generation: %s\n",
314
safer_gnutls_strerror(ret));
315
return -1;
316
}
317
318
gnutls_certificate_set_dh_params(mc->cred, *dh_params);
319
320
// GnuTLS session creation
321
if ((ret = gnutls_init(session, GNUTLS_SERVER))
322
!= GNUTLS_E_SUCCESS){
471
323
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
472
324
safer_gnutls_strerror(ret));
473
325
}
474
326
475
{
476
const char *err;
477
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
478
if(ret != GNUTLS_E_SUCCESS){
479
fprintf(stderr, "Syntax error at: %s\n", err);
480
fprintf(stderr, "GnuTLS error: %s\n",
481
safer_gnutls_strerror(ret));
482
gnutls_deinit(*session);
483
return -1;
484
}
327
if ((ret = gnutls_priority_set_direct(*session, mc->priority, &err))
328
!= GNUTLS_E_SUCCESS) {
329
fprintf(stderr, "Syntax error at: %s\n", err);
330
fprintf(stderr, "GnuTLS error: %s\n",
331
safer_gnutls_strerror(ret));
332
return -1;
485
333
}
486
334
487
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
488
mc->cred);
489
if(ret != GNUTLS_E_SUCCESS){
490
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
335
if ((ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
336
mc->cred))
337
!= GNUTLS_E_SUCCESS) {
338
fprintf(stderr, "Error setting a credentials set: %s\n",
491
339
safer_gnutls_strerror(ret));
492
gnutls_deinit(*session);
493
340
return -1;
494
341
}
495
342
496
343
/* ignore client certificate if any. */
497
gnutls_certificate_server_set_request(*session,
498
GNUTLS_CERT_IGNORE);
344
gnutls_certificate_server_set_request (*session,
345
GNUTLS_CERT_IGNORE);
499
346
500
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
347
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
501
348
502
349
return 0;
503
350
}
504
351
505
/* Avahi log function callback */
506
352
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
507
353
__attribute__((unused)) const char *txt){}
508
354
509
/* Called when a Mandos server is found */
510
355
static int start_mandos_communication(const char *ip, uint16_t port,
511
356
AvahiIfIndex if_index,
512
mandos_context *mc, int af){
357
mandos_context *mc){
513
358
int ret, tcp_sd;
514
ssize_t sret;
515
union {
516
struct sockaddr_in in;
517
struct sockaddr_in6 in6;
518
} to;
359
struct sockaddr_in6 to;
519
360
char *buffer = NULL;
520
361
char *decrypted_buffer;
521
362
size_t buffer_length = 0;
522
363
size_t buffer_capacity = 0;
523
364
ssize_t decrypted_buffer_size;
524
size_t written;
365
size_t written = 0;
525
366
int retval = 0;
367
char interface[IF_NAMESIZE];
526
368
gnutls_session_t session;
527
int pf; /* Protocol family */
528
529
switch(af){
530
case AF_INET6:
531
pf = PF_INET6;
532
break;
533
case AF_INET:
534
pf = PF_INET;
535
break;
536
default:
537
fprintf(stderr, "Bad address family: %d\n", af);
538
return -1;
539
}
540
541
ret = init_gnutls_session(mc, &session);
542
if(ret != 0){
543
return -1;
544
}
369
gnutls_dh_params_t dh_params;
545
370
546
371
if(debug){
547
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
548
"\n", ip, port);
372
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
373
ip, port);
549
374
}
550
375
551
tcp_sd = socket(pf, SOCK_STREAM, 0);
552
if(tcp_sd < 0){
376
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
377
if(tcp_sd < 0) {
553
378
perror("socket");
554
379
return -1;
555
380
}
381
382
if(debug){
383
if(if_indextoname((unsigned int)if_index, interface) == NULL){
384
perror("if_indextoname");
385
return -1;
386
}
387
fprintf(stderr, "Binding to interface %s\n", interface);
388
}
556
389
557
memset(&to, 0, sizeof(to));
558
if(af == AF_INET6){
559
to.in6.sin6_family = (uint16_t)af;
560
ret = inet_pton(af, ip, &to.in6.sin6_addr);
561
} else { /* IPv4 */
562
to.in.sin_family = (sa_family_t)af;
563
ret = inet_pton(af, ip, &to.in.sin_addr);
564
}
565
if(ret < 0 ){
390
memset(&to,0,sizeof(to)); /* Spurious warning */
391
to.sin6_family = AF_INET6;
392
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
393
if (ret < 0 ){
566
394
perror("inet_pton");
567
395
return -1;
568
396
}
570
398
fprintf(stderr, "Bad address: %s\n", ip);
571
399
return -1;
572
400
}
573
if(af == AF_INET6){
574
to.in6.sin6_port = htons(port); /* Spurious warnings from
575
-Wconversion and
576
-Wunreachable-code */
577
578
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
579
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
580
-Wunreachable-code*/
581
if(if_index == AVAHI_IF_UNSPEC){
582
fprintf(stderr, "An IPv6 link-local address is incomplete"
583
" without a network interface\n");
584
return -1;
585
}
586
/* Set the network interface number as scope */
587
to.in6.sin6_scope_id = (uint32_t)if_index;
588
}
589
} else {
590
to.in.sin_port = htons(port); /* Spurious warnings from
591
-Wconversion and
592
-Wunreachable-code */
593
}
401
to.sin6_port = htons(port); /* Spurious warning */
402
403
to.sin6_scope_id = (uint32_t)if_index;
594
404
595
405
if(debug){
596
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
597
char interface[IF_NAMESIZE];
598
if(if_indextoname((unsigned int)if_index, interface) == NULL){
599
perror("if_indextoname");
600
} else {
601
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
602
ip, interface, port);
603
}
604
} else {
605
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
606
port);
607
}
608
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
609
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
610
const char *pcret;
611
if(af == AF_INET6){
612
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
613
sizeof(addrstr));
614
} else {
615
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
616
sizeof(addrstr));
617
}
618
if(pcret == NULL){
406
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
407
char addrstr[INET6_ADDRSTRLEN] = "";
408
if(inet_ntop(to.sin6_family, &(to.sin6_addr), addrstr,
409
sizeof(addrstr)) == NULL){
619
410
perror("inet_ntop");
620
411
} else {
621
412
if(strcmp(addrstr, ip) != 0){
624
415
}
625
416
}
626
417
627
if(af == AF_INET6){
628
ret = connect(tcp_sd, &to.in6, sizeof(to));
629
} else {
630
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
631
}
632
if(ret < 0){
418
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
419
if (ret < 0){
633
420
perror("connect");
634
421
return -1;
635
422
}
636
423
637
const char *out = mandos_protocol_version;
638
written = 0;
639
while(true){
640
size_t out_size = strlen(out);
641
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
642
out_size - written));
643
if(ret == -1){
644
perror("write");
645
retval = -1;
646
goto mandos_end;
647
}
648
written += (size_t)ret;
649
if(written < out_size){
650
continue;
651
} else {
652
if(out == mandos_protocol_version){
653
written = 0;
654
out = "\r\n";
655
} else {
656
break;
657
}
658
}
424
ret = initgnutls (mc, &session, &dh_params);
425
if (ret != 0){
426
retval = -1;
427
return -1;
659
428
}
660
429
430
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
431
661
432
if(debug){
662
433
fprintf(stderr, "Establishing TLS session with %s\n", ip);
663
434
}
664
435
665
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
666
667
do{
668
ret = gnutls_handshake(session);
669
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
670
671
if(ret != GNUTLS_E_SUCCESS){
436
ret = gnutls_handshake (session);
437
438
if (ret != GNUTLS_E_SUCCESS){
672
439
if(debug){
673
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
674
gnutls_perror(ret);
440
fprintf(stderr, "\n*** Handshake failed ***\n");
441
gnutls_perror (ret);
675
442
}
676
443
retval = -1;
677
goto mandos_end;
444
goto exit;
678
445
}
679
446
680
/* Read OpenPGP packet that contains the wanted password */
447
//Retrieve OpenPGP packet that contains the wanted password
681
448
682
449
if(debug){
683
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
450
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
684
451
ip);
685
452
}
686
453
687
454
while(true){
688
buffer_capacity = adjustbuffer(&buffer, buffer_length,
689
buffer_capacity);
690
if(buffer_capacity == 0){
691
perror("adjustbuffer");
692
retval = -1;
693
goto mandos_end;
455
if (buffer_length + BUFFER_SIZE > buffer_capacity){
456
buffer = realloc(buffer, buffer_capacity + BUFFER_SIZE);
457
if (buffer == NULL){
458
perror("realloc");
459
goto exit;
460
}
461
buffer_capacity += BUFFER_SIZE;
694
462
}
695
463
696
sret = gnutls_record_recv(session, buffer+buffer_length,
697
BUFFER_SIZE);
698
if(sret == 0){
464
ret = gnutls_record_recv(session, buffer+buffer_length,
465
BUFFER_SIZE);
466
if (ret == 0){
699
467
break;
700
468
}
701
if(sret < 0){
702
switch(sret){
469
if (ret < 0){
470
switch(ret){
703
471
case GNUTLS_E_INTERRUPTED:
704
472
case GNUTLS_E_AGAIN:
705
473
break;
706
474
case GNUTLS_E_REHANDSHAKE:
707
do{
708
ret = gnutls_handshake(session);
709
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
710
if(ret < 0){
711
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
712
gnutls_perror(ret);
475
ret = gnutls_handshake (session);
476
if (ret < 0){
477
fprintf(stderr, "\n*** Handshake failed ***\n");
478
gnutls_perror (ret);
713
479
retval = -1;
714
goto mandos_end;
480
goto exit;
715
481
}
716
482
break;
717
483
default:
718
484
fprintf(stderr, "Unknown error while reading data from"
719
" encrypted session with Mandos server\n");
485
" encrypted session with mandos server\n");
720
486
retval = -1;
721
gnutls_bye(session, GNUTLS_SHUT_RDWR);
722
goto mandos_end;
487
gnutls_bye (session, GNUTLS_SHUT_RDWR);
488
goto exit;
723
489
}
724
490
} else {
725
buffer_length += (size_t) sret;
491
buffer_length += (size_t) ret;
726
492
}
727
493
}
728
494
729
if(debug){
730
fprintf(stderr, "Closing TLS session\n");
731
}
732
733
gnutls_bye(session, GNUTLS_SHUT_RDWR);
734
735
if(buffer_length > 0){
736
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
495
if (buffer_length > 0){
496
decrypted_buffer_size = pgp_packet_decrypt(buffer,
737
497
buffer_length,
738
&decrypted_buffer);
739
if(decrypted_buffer_size >= 0){
740
written = 0;
498
&decrypted_buffer,
499
keydir);
500
if (decrypted_buffer_size >= 0){
741
501
while(written < (size_t) decrypted_buffer_size){
742
ret = (int)fwrite(decrypted_buffer + written, 1,
743
(size_t)decrypted_buffer_size - written,
744
stdout);
502
ret = (int)fwrite (decrypted_buffer + written, 1,
503
(size_t)decrypted_buffer_size - written,
504
stdout);
745
505
if(ret == 0 and ferror(stdout)){
746
506
if(debug){
747
507
fprintf(stderr, "Error writing encrypted data: %s\n",
756
516
} else {
757
517
retval = -1;
758
518
}
759
} else {
760
retval = -1;
761
}
762
763
/* Shutdown procedure */
764
765
mandos_end:
519
}
520
521
//shutdown procedure
522
523
if(debug){
524
fprintf(stderr, "Closing TLS session\n");
525
}
526
766
527
free(buffer);
767
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
768
if(ret == -1){
769
perror("close");
770
}
771
gnutls_deinit(session);
528
gnutls_bye (session, GNUTLS_SHUT_RDWR);
529
exit:
530
close(tcp_sd);
531
gnutls_deinit (session);
532
gnutls_certificate_free_credentials (mc->cred);
533
gnutls_global_deinit ();
772
534
return retval;
773
535
}
774
536
775
static void resolve_callback(AvahiSServiceResolver *r,
776
AvahiIfIndex interface,
777
AvahiProtocol proto,
778
AvahiResolverEvent event,
779
const char *name,
780
const char *type,
781
const char *domain,
782
const char *host_name,
783
const AvahiAddress *address,
784
uint16_t port,
785
AVAHI_GCC_UNUSED AvahiStringList *txt,
786
AVAHI_GCC_UNUSED AvahiLookupResultFlags
787
flags,
788
void* userdata){
537
static void resolve_callback( AvahiSServiceResolver *r,
538
AvahiIfIndex interface,
539
AVAHI_GCC_UNUSED AvahiProtocol protocol,
540
AvahiResolverEvent event,
541
const char *name,
542
const char *type,
543
const char *domain,
544
const char *host_name,
545
const AvahiAddress *address,
546
uint16_t port,
547
AVAHI_GCC_UNUSED AvahiStringList *txt,
548
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
549
void* userdata) {
789
550
mandos_context *mc = userdata;
790
assert(r);
551
assert(r); /* Spurious warning */
791
552
792
553
/* Called whenever a service has been resolved successfully or
793
554
timed out */
794
555
795
switch(event){
556
switch (event) {
796
557
default:
797
558
case AVAHI_RESOLVER_FAILURE:
798
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
799
" of type '%s' in domain '%s': %s\n", name, type, domain,
559
fprintf(stderr, "(Resolver) Failed to resolve service '%s' of"
560
" type '%s' in domain '%s': %s\n", name, type, domain,
800
561
avahi_strerror(avahi_server_errno(mc->server)));
801
562
break;
802
563
805
566
char ip[AVAHI_ADDRESS_STR_MAX];
806
567
avahi_address_snprint(ip, sizeof(ip), address);
807
568
if(debug){
808
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
809
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
810
ip, (intmax_t)interface, port);
569
fprintf(stderr, "Mandos server \"%s\" found on %s (%s) on"
570
" port %d\n", name, host_name, ip, port);
811
571
}
812
int ret = start_mandos_communication(ip, port, interface, mc,
813
avahi_proto_to_af(proto));
814
if(ret == 0){
815
avahi_simple_poll_quit(mc->simple_poll);
572
int ret = start_mandos_communication(ip, port, interface, mc);
573
if (ret == 0){
574
exit(EXIT_SUCCESS);
816
575
}
817
576
}
818
577
}
819
578
avahi_s_service_resolver_free(r);
820
579
}
821
580
822
static void browse_callback(AvahiSServiceBrowser *b,
823
AvahiIfIndex interface,
824
AvahiProtocol protocol,
825
AvahiBrowserEvent event,
826
const char *name,
827
const char *type,
828
const char *domain,
829
AVAHI_GCC_UNUSED AvahiLookupResultFlags
830
flags,
831
void* userdata){
581
static void browse_callback( AvahiSServiceBrowser *b,
582
AvahiIfIndex interface,
583
AvahiProtocol protocol,
584
AvahiBrowserEvent event,
585
const char *name,
586
const char *type,
587
const char *domain,
588
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
589
void* userdata) {
832
590
mandos_context *mc = userdata;
833
assert(b);
591
assert(b); /* Spurious warning */
834
592
835
593
/* Called whenever a new services becomes available on the LAN or
836
594
is removed from the LAN */
837
595
838
switch(event){
596
switch (event) {
839
597
default:
840
598
case AVAHI_BROWSER_FAILURE:
841
599
842
fprintf(stderr, "(Avahi browser) %s\n",
600
fprintf(stderr, "(Browser) %s\n",
843
601
avahi_strerror(avahi_server_errno(mc->server)));
844
602
avahi_simple_poll_quit(mc->simple_poll);
845
603
return;
846
604
847
605
case AVAHI_BROWSER_NEW:
848
/* We ignore the returned Avahi resolver object. In the callback
849
function we free it. If the Avahi server is terminated before
850
the callback function is called the Avahi server will free the
851
resolver for us. */
606
/* We ignore the returned resolver object. In the callback
607
function we free it. If the server is terminated before
608
the callback function is called the server will free
609
the resolver for us. */
852
610
853
if(!(avahi_s_service_resolver_new(mc->server, interface,
854
protocol, name, type, domain,
611
if (!(avahi_s_service_resolver_new(mc->server, interface, protocol, name,
612
type, domain,
855
613
AVAHI_PROTO_INET6, 0,
856
614
resolve_callback, mc)))
857
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
858
name, avahi_strerror(avahi_server_errno(mc->server)));
615
fprintf(stderr, "Failed to resolve service '%s': %s\n", name,
616
avahi_strerror(avahi_server_errno(mc->server)));
859
617
break;
860
618
861
619
case AVAHI_BROWSER_REMOVE:
863
621
864
622
case AVAHI_BROWSER_ALL_FOR_NOW:
865
623
case AVAHI_BROWSER_CACHE_EXHAUSTED:
866
if(debug){
867
fprintf(stderr, "No Mandos server found, still searching...\n");
868
}
869
624
break;
870
625
}
871
626
}
872
627
873
int main(int argc, char *argv[]){
874
AvahiSServiceBrowser *sb = NULL;
875
int error;
876
int ret;
877
intmax_t tmpmax;
878
int numchars;
879
int exitcode = EXIT_SUCCESS;
880
const char *interface = "eth0";
881
struct ifreq network;
882
int sd;
883
uid_t uid;
884
gid_t gid;
885
char *connect_to = NULL;
886
char tempdir[] = "/tmp/mandosXXXXXX";
887
bool tempdir_created = false;
888
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
889
const char *seckey = PATHDIR "/" SECKEY;
890
const char *pubkey = PATHDIR "/" PUBKEY;
891
892
mandos_context mc = { .simple_poll = NULL, .server = NULL,
893
.dh_bits = 1024, .priority = "SECURE256"
894
":!CTYPE-X.509:+CTYPE-OPENPGP" };
895
bool gnutls_initialized = false;
896
bool gpgme_initialized = false;
897
double delay = 2.5;
898
899
{
900
struct argp_option options[] = {
901
{ .name = "debug", .key = 128,
902
.doc = "Debug mode", .group = 3 },
903
{ .name = "connect", .key = 'c',
904
.arg = "ADDRESS:PORT",
905
.doc = "Connect directly to a specific Mandos server",
906
.group = 1 },
907
{ .name = "interface", .key = 'i',
908
.arg = "NAME",
909
.doc = "Network interface that will be used to search for"
910
" Mandos servers",
911
.group = 1 },
912
{ .name = "seckey", .key = 's',
913
.arg = "FILE",
914
.doc = "OpenPGP secret key file base name",
915
.group = 1 },
916
{ .name = "pubkey", .key = 'p',
917
.arg = "FILE",
918
.doc = "OpenPGP public key file base name",
919
.group = 2 },
920
{ .name = "dh-bits", .key = 129,
921
.arg = "BITS",
922
.doc = "Bit length of the prime number used in the"
923
" Diffie-Hellman key exchange",
924
.group = 2 },
925
{ .name = "priority", .key = 130,
926
.arg = "STRING",
927
.doc = "GnuTLS priority string for the TLS handshake",
928
.group = 1 },
929
{ .name = "delay", .key = 131,
930
.arg = "SECONDS",
931
.doc = "Maximum delay to wait for interface startup",
932
.group = 2 },
933
{ .name = NULL }
934
};
628
/* Combines file name and path and returns the malloced new
629
string. some sane checks could/should be added */
630
static const char *combinepath(const char *first, const char *second){
631
size_t f_len = strlen(first);
632
size_t s_len = strlen(second);
633
char *tmp = malloc(f_len + s_len + 2);
634
if (tmp == NULL){
635
return NULL;
636
}
637
if(f_len > 0){
638
memcpy(tmp, first, f_len); /* Spurious warning */
639
}
640
tmp[f_len] = '/';
641
if(s_len > 0){
642
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
643
}
644
tmp[f_len + 1 + s_len] = '\0';
645
return tmp;
646
}
647
648
649
int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
650
AvahiServerConfig config;
651
AvahiSServiceBrowser *sb = NULL;
652
int error;
653
int ret;
654
int debug_int;
655
int returncode = EXIT_SUCCESS;
656
const char *interface = "eth0";
657
struct ifreq network;
658
int sd;
659
char *connect_to = NULL;
660
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
661
mandos_context mc = { .simple_poll = NULL, .server = NULL,
662
.dh_bits = 1024, .priority = "SECURE256"};
935
663
936
error_t parse_opt(int key, char *arg,
937
struct argp_state *state){
938
switch(key){
939
case 128: /* --debug */
940
debug = true;
941
break;
942
case 'c': /* --connect */
943
connect_to = arg;
944
break;
945
case 'i': /* --interface */
946
interface = arg;
947
break;
948
case 's': /* --seckey */
949
seckey = arg;
950
break;
951
case 'p': /* --pubkey */
952
pubkey = arg;
953
break;
954
case 129: /* --dh-bits */
955
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
956
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
957
or arg[numchars] != '\0'){
958
fprintf(stderr, "Bad number of DH bits\n");
959
exit(EXIT_FAILURE);
960
}
961
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
962
break;
963
case 130: /* --priority */
964
mc.priority = arg;
965
break;
966
case 131: /* --delay */
967
ret = sscanf(arg, "%lf%n", &delay, &numchars);
968
if(ret < 1 or arg[numchars] != '\0'){
969
fprintf(stderr, "Bad delay\n");
970
exit(EXIT_FAILURE);
971
}
972
break;
973
case ARGP_KEY_ARG:
974
argp_usage(state);
975
case ARGP_KEY_END:
976
break;
664
debug_int = debug ? 1 : 0;
665
while (true){
666
struct option long_options[] = {
667
{"debug", no_argument, &debug_int, 1},
668
{"connect", required_argument, NULL, 'c'},
669
{"interface", required_argument, NULL, 'i'},
670
{"keydir", required_argument, NULL, 'd'},
671
{"seckey", required_argument, NULL, 's'},
672
{"pubkey", required_argument, NULL, 'p'},
673
{"dh-bits", required_argument, NULL, 'D'},
674
{"priority", required_argument, NULL, 'P'},
675
{0, 0, 0, 0} };
676
677
int option_index = 0;
678
ret = getopt_long (argc, argv, "i:", long_options,
679
&option_index);
680
681
if (ret == -1){
682
break;
683
}
684
685
switch(ret){
686
case 0:
687
break;
688
case 'i':
689
interface = optarg;
690
break;
691
case 'c':
692
connect_to = optarg;
693
break;
694
case 'd':
695
keydir = optarg;
696
break;
697
case 'p':
698
pubkeyfile = optarg;
699
break;
700
case 's':
701
seckeyfile = optarg;
702
break;
703
case 'D':
704
errno = 0;
705
mc.dh_bits = (unsigned int) strtol(optarg, NULL, 10);
706
if (errno){
707
perror("strtol");
708
exit(EXIT_FAILURE);
709
}
710
break;
711
case 'P':
712
mc.priority = optarg;
713
break;
714
case '?':
977
715
default:
978
return ARGP_ERR_UNKNOWN;
979
}
980
return 0;
981
}
982
983
struct argp argp = { .options = options, .parser = parse_opt,
984
.args_doc = "",
985
.doc = "Mandos client -- Get and decrypt"
986
" passwords from a Mandos server" };
987
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
988
if(ret == ARGP_ERR_UNKNOWN){
989
fprintf(stderr, "Unknown error while parsing arguments\n");
990
exitcode = EXIT_FAILURE;
991
goto end;
992
}
993
}
994
995
/* If the interface is down, bring it up */
996
if(interface[0] != '\0'){
997
#ifdef __linux__
998
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
999
messages to mess up the prompt */
1000
ret = klogctl(8, NULL, 5);
1001
bool restore_loglevel = true;
1002
if(ret == -1){
1003
restore_loglevel = false;
1004
perror("klogctl");
1005
}
1006
#endif
716
exit(EXIT_FAILURE);
717
}
718
}
719
debug = debug_int ? true : false;
720
721
pubkeyfile = combinepath(keydir, pubkeyfile);
722
if (pubkeyfile == NULL){
723
perror("combinepath");
724
returncode = EXIT_FAILURE;
725
goto exit;
726
}
727
728
seckeyfile = combinepath(keydir, seckeyfile);
729
if (seckeyfile == NULL){
730
perror("combinepath");
731
goto exit;
732
}
733
734
if_index = (AvahiIfIndex) if_nametoindex(interface);
735
if(if_index == 0){
736
fprintf(stderr, "No such interface: \"%s\"\n", interface);
737
exit(EXIT_FAILURE);
738
}
739
740
if(connect_to != NULL){
741
/* Connect directly, do not use Zeroconf */
742
/* (Mainly meant for debugging) */
743
char *address = strrchr(connect_to, ':');
744
if(address == NULL){
745
fprintf(stderr, "No colon in address\n");
746
exit(EXIT_FAILURE);
747
}
748
errno = 0;
749
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
750
if(errno){
751
perror("Bad port number");
752
exit(EXIT_FAILURE);
753
}
754
*address = '\0';
755
address = connect_to;
756
ret = start_mandos_communication(address, port, if_index, &mc);
757
if(ret < 0){
758
exit(EXIT_FAILURE);
759
} else {
760
exit(EXIT_SUCCESS);
761
}
762
}
1007
763
1008
764
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1009
if(sd < 0){
765
if(sd < 0) {
1010
766
perror("socket");
1011
exitcode = EXIT_FAILURE;
1012
#ifdef __linux__
1013
if(restore_loglevel){
1014
ret = klogctl(7, NULL, 0);
1015
if(ret == -1){
1016
perror("klogctl");
1017
}
1018
}
1019
#endif
1020
goto end;
767
returncode = EXIT_FAILURE;
768
goto exit;
1021
769
}
1022
strcpy(network.ifr_name, interface);
770
strcpy(network.ifr_name, interface); /* Spurious warning */
1023
771
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1024
772
if(ret == -1){
773
1025
774
perror("ioctl SIOCGIFFLAGS");
1026
#ifdef __linux__
1027
if(restore_loglevel){
1028
ret = klogctl(7, NULL, 0);
1029
if(ret == -1){
1030
perror("klogctl");
1031
}
1032
}
1033
#endif
1034
exitcode = EXIT_FAILURE;
1035
goto end;
775
returncode = EXIT_FAILURE;
776
goto exit;
1036
777
}
1037
778
if((network.ifr_flags & IFF_UP) == 0){
1038
779
network.ifr_flags |= IFF_UP;
1039
780
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1040
781
if(ret == -1){
1041
782
perror("ioctl SIOCSIFFLAGS");
1042
exitcode = EXIT_FAILURE;
1043
#ifdef __linux__
1044
if(restore_loglevel){
1045
ret = klogctl(7, NULL, 0);
1046
if(ret == -1){
1047
perror("klogctl");
1048
}
1049
}
1050
#endif
1051
goto end;
1052
}
1053
}
1054
/* sleep checking until interface is running */
1055
for(int i=0; i < delay * 4; i++){
1056
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1057
if(ret == -1){
1058
perror("ioctl SIOCGIFFLAGS");
1059
} else if(network.ifr_flags & IFF_RUNNING){
1060
break;
1061
}
1062
struct timespec sleeptime = { .tv_nsec = 250000000 };
1063
ret = nanosleep(&sleeptime, NULL);
1064
if(ret == -1 and errno != EINTR){
1065
perror("nanosleep");
1066
}
1067
}
1068
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1069
if(ret == -1){
1070
perror("close");
1071
}
1072
#ifdef __linux__
1073
if(restore_loglevel){
1074
/* Restores kernel loglevel to default */
1075
ret = klogctl(7, NULL, 0);
1076
if(ret == -1){
1077
perror("klogctl");
1078
}
1079
}
1080
#endif
1081
}
1082
1083
uid = getuid();
1084
gid = getgid();
1085
1086
errno = 0;
1087
setgid(gid);
1088
if(ret == -1){
1089
perror("setgid");
1090
}
1091
1092
ret = setuid(uid);
1093
if(ret == -1){
1094
perror("setuid");
1095
}
1096
1097
ret = init_gnutls_global(&mc, pubkey, seckey);
1098
if(ret == -1){
1099
fprintf(stderr, "init_gnutls_global failed\n");
1100
exitcode = EXIT_FAILURE;
1101
goto end;
1102
} else {
1103
gnutls_initialized = true;
1104
}
1105
1106
if(mkdtemp(tempdir) == NULL){
1107
perror("mkdtemp");
1108
goto end;
1109
}
1110
tempdir_created = true;
1111
1112
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
1113
fprintf(stderr, "init_gpgme failed\n");
1114
exitcode = EXIT_FAILURE;
1115
goto end;
1116
} else {
1117
gpgme_initialized = true;
1118
}
1119
1120
if(interface[0] != '\0'){
1121
if_index = (AvahiIfIndex) if_nametoindex(interface);
1122
if(if_index == 0){
1123
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1124
exitcode = EXIT_FAILURE;
1125
goto end;
1126
}
1127
}
1128
1129
if(connect_to != NULL){
1130
/* Connect directly, do not use Zeroconf */
1131
/* (Mainly meant for debugging) */
1132
char *address = strrchr(connect_to, ':');
1133
if(address == NULL){
1134
fprintf(stderr, "No colon in address\n");
1135
exitcode = EXIT_FAILURE;
1136
goto end;
1137
}
1138
uint16_t port;
1139
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1140
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1141
or address[numchars+1] != '\0'){
1142
fprintf(stderr, "Bad port number\n");
1143
exitcode = EXIT_FAILURE;
1144
goto end;
1145
}
1146
port = (uint16_t)tmpmax;
1147
*address = '\0';
1148
address = connect_to;
1149
/* Colon in address indicates IPv6 */
1150
int af;
1151
if(strchr(address, ':') != NULL){
1152
af = AF_INET6;
1153
} else {
1154
af = AF_INET;
1155
}
1156
ret = start_mandos_communication(address, port, if_index, &mc,
1157
af);
1158
if(ret < 0){
1159
exitcode = EXIT_FAILURE;
1160
} else {
1161
exitcode = EXIT_SUCCESS;
1162
}
1163
goto end;
1164
}
1165
1166
if(not debug){
1167
avahi_set_log_function(empty_log);
1168
}
1169
1170
/* Initialize the pseudo-RNG for Avahi */
1171
srand((unsigned int) time(NULL));
1172
1173
/* Allocate main Avahi loop object */
1174
mc.simple_poll = avahi_simple_poll_new();
1175
if(mc.simple_poll == NULL){
1176
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1177
exitcode = EXIT_FAILURE;
1178
goto end;
1179
}
1180
1181
{
1182
AvahiServerConfig config;
1183
/* Do not publish any local Zeroconf records */
783
returncode = EXIT_FAILURE;
784
goto exit;
785
}
786
}
787
close(sd);
788
789
if (not debug){
790
avahi_set_log_function(empty_log);
791
}
792
793
/* Initialize the psuedo-RNG */
794
srand((unsigned int) time(NULL));
795
796
/* Allocate main loop object */
797
if (!(mc.simple_poll = avahi_simple_poll_new())) {
798
fprintf(stderr, "Failed to create simple poll object.\n");
799
returncode = EXIT_FAILURE;
800
goto exit;
801
}
802
803
/* Do not publish any local records */
1184
804
avahi_server_config_init(&config);
1185
805
config.publish_hinfo = 0;
1186
806
config.publish_addresses = 0;
1187
807
config.publish_workstation = 0;
1188
808
config.publish_domain = 0;
1189
809
1190
810
/* Allocate a new server */
1191
mc.server = avahi_server_new(avahi_simple_poll_get
1192
(mc.simple_poll), &config, NULL,
1193
NULL, &error);
811
mc.server=avahi_server_new(avahi_simple_poll_get(mc.simple_poll),
812
&config, NULL, NULL, &error);
1194
813
1195
/* Free the Avahi configuration data */
814
/* Free the configuration data */
1196
815
avahi_server_config_free(&config);
1197
}
1198
1199
/* Check if creating the Avahi server object succeeded */
1200
if(mc.server == NULL){
1201
fprintf(stderr, "Failed to create Avahi server: %s\n",
1202
avahi_strerror(error));
1203
exitcode = EXIT_FAILURE;
1204
goto end;
1205
}
1206
1207
/* Create the Avahi service browser */
1208
sb = avahi_s_service_browser_new(mc.server, if_index,
1209
AVAHI_PROTO_INET6, "_mandos._tcp",
1210
NULL, 0, browse_callback, &mc);
1211
if(sb == NULL){
1212
fprintf(stderr, "Failed to create service browser: %s\n",
1213
avahi_strerror(avahi_server_errno(mc.server)));
1214
exitcode = EXIT_FAILURE;
1215
goto end;
1216
}
1217
1218
/* Run the main loop */
1219
1220
if(debug){
1221
fprintf(stderr, "Starting Avahi loop search\n");
1222
}
1223
1224
avahi_simple_poll_loop(mc.simple_poll);
1225
1226
end:
1227
1228
if(debug){
1229
fprintf(stderr, "%s exiting\n", argv[0]);
1230
}
1231
1232
/* Cleanup things */
1233
if(sb != NULL)
1234
avahi_s_service_browser_free(sb);
1235
1236
if(mc.server != NULL)
1237
avahi_server_free(mc.server);
1238
1239
if(mc.simple_poll != NULL)
1240
avahi_simple_poll_free(mc.simple_poll);
1241
1242
if(gnutls_initialized){
1243
gnutls_certificate_free_credentials(mc.cred);
1244
gnutls_global_deinit();
1245
gnutls_dh_params_deinit(mc.dh_params);
1246
}
1247
1248
if(gpgme_initialized){
1249
gpgme_release(mc.ctx);
1250
}
1251
1252
/* Removes the temp directory used by GPGME */
1253
if(tempdir_created){
1254
DIR *d;
1255
struct dirent *direntry;
1256
d = opendir(tempdir);
1257
if(d == NULL){
1258
if(errno != ENOENT){
1259
perror("opendir");
1260
}
1261
} else {
1262
while(true){
1263
direntry = readdir(d);
1264
if(direntry == NULL){
1265
break;
1266
}
1267
/* Skip "." and ".." */
1268
if(direntry->d_name[0] == '.'
1269
and (direntry->d_name[1] == '\0'
1270
or (direntry->d_name[1] == '.'
1271
and direntry->d_name[2] == '\0'))){
1272
continue;
1273
}
1274
char *fullname = NULL;
1275
ret = asprintf(&fullname, "%s/%s", tempdir,
1276
direntry->d_name);
1277
if(ret < 0){
1278
perror("asprintf");
1279
continue;
1280
}
1281
ret = remove(fullname);
1282
if(ret == -1){
1283
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1284
strerror(errno));
1285
}
1286
free(fullname);
1287
}
1288
closedir(d);
1289
}
1290
ret = rmdir(tempdir);
1291
if(ret == -1 and errno != ENOENT){
1292
perror("rmdir");
1293
}
1294
}
1295
1296
return exitcode;
816
817
/* Check if creating the server object succeeded */
818
if (!mc.server) {
819
fprintf(stderr, "Failed to create server: %s\n",
820
avahi_strerror(error));
821
returncode = EXIT_FAILURE;
822
goto exit;
823
}
824
825
/* Create the service browser */
826
sb = avahi_s_service_browser_new(mc.server, if_index,
827
AVAHI_PROTO_INET6,
828
"_mandos._tcp", NULL, 0,
829
browse_callback, &mc);
830
if (!sb) {
831
fprintf(stderr, "Failed to create service browser: %s\n",
832
avahi_strerror(avahi_server_errno(mc.server)));
833
returncode = EXIT_FAILURE;
834
goto exit;
835
}
836
837
/* Run the main loop */
838
839
if (debug){
840
fprintf(stderr, "Starting avahi loop search\n");
841
}
842
843
avahi_simple_poll_loop(mc.simple_poll);
844
845
exit:
846
847
if (debug){
848
fprintf(stderr, "%s exiting\n", argv[0]);
849
}
850
851
/* Cleanup things */
852
if (sb)
853
avahi_s_service_browser_free(sb);
854
855
if (mc.server)
856
avahi_server_free(mc.server);
857
858
if (mc.simple_poll)
859
avahi_simple_poll_free(mc.simple_poll);
860
free(pubkeyfile);
861
free(seckeyfile);
862
863
return returncode;
1297
864
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0