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- Committer: Teddy Hogeborn
- Date: 2008-08-01 06:33:15 UTC
- Revision ID: teddy@fukt.bsnet.se-20080801063315-4k33q3ek28hjc3tu
* plugins.d/plugbasedclient.c: Update include file comments.
(struct process.disable): Renamed to "disabled". All users changed.
(addarguments): Renamed to "addargument". All callers changed.
(doc, args_doc): Removed.
(main): Changed default "plugindir" to
"/conf/conf.d/mandos/plugins.d". Renamed "rfds_orig" to
"rfds_all"; all users changed. New "debug" and
"exitstatus" variables. New "--debug" option. Removed
unnecessary ".flags = 0" from all options. Changed so that
"--disable-plugin" only takes one plugin. Check for
non-existence of ":" in argument to "--options-for". Added
some debugging outputs. Set the FD_CLOEXEC flag on the
directory FD. More capable code for dealing with
disallowed plugin file name prefixes and suffixes. Bug
fix: check for some malloc failures. Moved allocating the
"struct process *new_process" to after the fork. Do
_exit() instead of exit() in the child.
* plugins.d/mandosclient.c: Updated contact information.
(struct process.disable): Renamed to "disabled". All users changed.
(addarguments): Renamed to "addargument". All callers changed.
(doc, args_doc): Removed.
(main): Changed default "plugindir" to
"/conf/conf.d/mandos/plugins.d". Renamed "rfds_orig" to
"rfds_all"; all users changed. New "debug" and
"exitstatus" variables. New "--debug" option. Removed
unnecessary ".flags = 0" from all options. Changed so that
"--disable-plugin" only takes one plugin. Check for
non-existence of ":" in argument to "--options-for". Added
some debugging outputs. Set the FD_CLOEXEC flag on the
directory FD. More capable code for dealing with
disallowed plugin file name prefixes and suffixes. Bug
fix: check for some malloc failures. Moved allocating the
"struct process *new_process" to after the fork. Do
_exit() instead of exit() in the child.
* plugins.d/mandosclient.c: Updated contact information.
added
removed
plugins.d/mandosclient.c
32
32
#define _LARGEFILE_SOURCE
33
33
#define _FILE_OFFSET_BITS 64
34
34
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
36
37
35
#include <stdio.h>
38
36
#include <assert.h>
39
37
#include <stdlib.h>
40
38
#include <time.h>
41
39
#include <net/if.h> /* if_nametoindex */
42
#include <sys/ioctl.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
43
SIOCSIFFLAGS */
44
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
45
SIOCSIFFLAGS */
46
40
47
41
#include <avahi-core/core.h>
48
42
#include <avahi-core/lookup.h>
51
45
#include <avahi-common/malloc.h>
52
46
#include <avahi-common/error.h>
53
47
54
/* Mandos client part */
48
//mandos client part
55
49
#include <sys/types.h> /* socket(), inet_pton() */
56
50
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
57
51
struct in6_addr, inet_pton() */
64
58
#include <string.h> /* memset */
65
59
#include <arpa/inet.h> /* inet_pton() */
66
60
#include <iso646.h> /* not */
67
#include <net/if.h> /* IF_NAMESIZE */
68
#include <argp.h> /* struct argp_option,
69
struct argp_state, struct argp,
70
argp_parse() */
71
/* GPGME */
61
62
// gpgme
72
63
#include <errno.h> /* perror() */
73
64
#include <gpgme.h>
74
65
66
// getopt long
67
#include <getopt.h>
68
75
69
#define BUFFER_SIZE 256
70
#define DH_BITS 1024
71
72
const char *certdir = "/conf/conf.d/cryptkeyreq/";
73
const char *certfile = "openpgp-client.txt";
74
const char *certkey = "openpgp-client-key.txt";
76
75
77
76
bool debug = false;
78
static const char *keydir = "/conf/conf.d/mandos";
79
static const char mandos_protocol_version[] = "1";
80
const char *argp_program_version = "mandosclient 0.9";
81
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
82
77
83
/* Used for passing in values through the Avahi callback functions */
84
78
typedef struct {
85
AvahiSimplePoll *simple_poll;
86
AvahiServer *server;
79
gnutls_session_t session;
87
80
gnutls_certificate_credentials_t cred;
88
unsigned int dh_bits;
89
81
gnutls_dh_params_t dh_params;
90
const char *priority;
91
} mandos_context;
92
93
/*
94
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
95
* "buffer_capacity" is how much is currently allocated,
96
* "buffer_length" is how much is already used.
97
*/
98
size_t adjustbuffer(char **buffer, size_t buffer_length,
99
size_t buffer_capacity){
100
if (buffer_length + BUFFER_SIZE > buffer_capacity){
101
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
102
if (buffer == NULL){
103
return 0;
104
}
105
buffer_capacity += BUFFER_SIZE;
106
}
107
return buffer_capacity;
108
}
109
110
/*
111
* Decrypt OpenPGP data using keyrings in HOMEDIR.
112
* Returns -1 on error
113
*/
114
static ssize_t pgp_packet_decrypt (const char *cryptotext,
115
size_t crypto_size,
116
char **plaintext,
117
const char *homedir){
82
} encrypted_session;
83
84
85
ssize_t pgp_packet_decrypt (char *packet, size_t packet_size,
86
char **new_packet, const char *homedir){
118
87
gpgme_data_t dh_crypto, dh_plain;
119
88
gpgme_ctx_t ctx;
120
89
gpgme_error_t rc;
121
90
ssize_t ret;
122
size_t plaintext_capacity = 0;
123
ssize_t plaintext_length = 0;
91
ssize_t new_packet_capacity = 0;
92
ssize_t new_packet_length = 0;
124
93
gpgme_engine_info_t engine_info;
125
94
126
95
if (debug){
127
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
96
fprintf(stderr, "Trying to decrypt OpenPGP packet\n");
128
97
}
129
98
130
99
/* Init GPGME */
136
105
return -1;
137
106
}
138
107
139
/* Set GPGME home directory for the OpenPGP engine only */
108
/* Set GPGME home directory */
140
109
rc = gpgme_get_engine_info (&engine_info);
141
110
if (rc != GPG_ERR_NO_ERROR){
142
111
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
152
121
engine_info = engine_info->next;
153
122
}
154
123
if(engine_info == NULL){
155
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
124
fprintf(stderr, "Could not set home dir to %s\n", homedir);
156
125
return -1;
157
126
}
158
127
159
/* Create new GPGME data buffer from memory cryptotext */
160
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
161
0);
128
/* Create new GPGME data buffer from packet buffer */
129
rc = gpgme_data_new_from_mem(&dh_crypto, packet, packet_size, 0);
162
130
if (rc != GPG_ERR_NO_ERROR){
163
131
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
164
132
gpgme_strsource(rc), gpgme_strerror(rc));
170
138
if (rc != GPG_ERR_NO_ERROR){
171
139
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
172
140
gpgme_strsource(rc), gpgme_strerror(rc));
173
gpgme_data_release(dh_crypto);
174
141
return -1;
175
142
}
176
143
179
146
if (rc != GPG_ERR_NO_ERROR){
180
147
fprintf(stderr, "bad gpgme_new: %s: %s\n",
181
148
gpgme_strsource(rc), gpgme_strerror(rc));
182
plaintext_length = -1;
183
goto decrypt_end;
149
return -1;
184
150
}
185
151
186
/* Decrypt data from the cryptotext data buffer to the plaintext
187
data buffer */
152
/* Decrypt data from the FILE pointer to the plaintext data
153
buffer */
188
154
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
189
155
if (rc != GPG_ERR_NO_ERROR){
190
156
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
191
157
gpgme_strsource(rc), gpgme_strerror(rc));
192
plaintext_length = -1;
193
goto decrypt_end;
158
return -1;
194
159
}
195
160
196
161
if(debug){
197
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
162
fprintf(stderr, "Decryption of OpenPGP packet succeeded\n");
198
163
}
199
164
200
165
if (debug){
201
166
gpgme_decrypt_result_t result;
202
167
result = gpgme_op_decrypt_result(ctx);
226
191
}
227
192
}
228
193
194
/* Delete the GPGME FILE pointer cryptotext data buffer */
195
gpgme_data_release(dh_crypto);
196
229
197
/* Seek back to the beginning of the GPGME plaintext data buffer */
230
198
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
231
199
perror("pgpme_data_seek");
232
plaintext_length = -1;
233
goto decrypt_end;
234
200
}
235
201
236
*plaintext = NULL;
202
*new_packet = 0;
237
203
while(true){
238
plaintext_capacity = adjustbuffer(plaintext,
239
(size_t)plaintext_length,
240
plaintext_capacity);
241
if (plaintext_capacity == 0){
242
perror("adjustbuffer");
243
plaintext_length = -1;
244
goto decrypt_end;
204
if (new_packet_length + BUFFER_SIZE > new_packet_capacity){
205
*new_packet = realloc(*new_packet,
206
(unsigned int)new_packet_capacity
207
+ BUFFER_SIZE);
208
if (*new_packet == NULL){
209
perror("realloc");
210
return -1;
211
}
212
new_packet_capacity += BUFFER_SIZE;
245
213
}
246
214
247
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
215
ret = gpgme_data_read(dh_plain, *new_packet + new_packet_length,
248
216
BUFFER_SIZE);
249
217
/* Print the data, if any */
250
218
if (ret == 0){
251
/* EOF */
252
219
break;
253
220
}
254
221
if(ret < 0){
255
222
perror("gpgme_data_read");
256
plaintext_length = -1;
257
goto decrypt_end;
223
return -1;
258
224
}
259
plaintext_length += ret;
225
new_packet_length += ret;
260
226
}
261
227
262
if(debug){
263
fprintf(stderr, "Decrypted password is: ");
264
for(ssize_t i = 0; i < plaintext_length; i++){
265
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
266
}
267
fprintf(stderr, "\n");
268
}
269
270
decrypt_end:
271
272
/* Delete the GPGME cryptotext data buffer */
273
gpgme_data_release(dh_crypto);
228
/* FIXME: check characters before printing to screen so to not print
229
terminal control characters */
230
/* if(debug){ */
231
/* fprintf(stderr, "decrypted password is: "); */
232
/* fwrite(*new_packet, 1, new_packet_length, stderr); */
233
/* fprintf(stderr, "\n"); */
234
/* } */
274
235
275
236
/* Delete the GPGME plaintext data buffer */
276
237
gpgme_data_release(dh_plain);
277
return plaintext_length;
238
return new_packet_length;
278
239
}
279
240
280
241
static const char * safer_gnutls_strerror (int value) {
284
245
return ret;
285
246
}
286
247
287
/* GnuTLS log function callback */
288
static void debuggnutls(__attribute__((unused)) int level,
289
const char* string){
290
fprintf(stderr, "GnuTLS: %s", string);
248
void debuggnutls(__attribute__((unused)) int level,
249
const char* string){
250
fprintf(stderr, "%s", string);
291
251
}
292
252
293
static int init_gnutls_global(mandos_context *mc,
294
const char *pubkeyfile,
295
const char *seckeyfile){
253
int initgnutls(encrypted_session *es){
254
const char *err;
296
255
int ret;
297
256
298
257
if(debug){
301
260
302
261
if ((ret = gnutls_global_init ())
303
262
!= GNUTLS_E_SUCCESS) {
304
fprintf (stderr, "GnuTLS global_init: %s\n",
305
safer_gnutls_strerror(ret));
263
fprintf (stderr, "global_init: %s\n", safer_gnutls_strerror(ret));
306
264
return -1;
307
265
}
308
266
309
267
if (debug){
310
/* "Use a log level over 10 to enable all debugging options."
311
* - GnuTLS manual
312
*/
313
268
gnutls_global_set_log_level(11);
314
269
gnutls_global_set_log_function(debuggnutls);
315
270
}
316
271
317
/* OpenPGP credentials */
318
if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))
272
/* openpgp credentials */
273
if ((ret = gnutls_certificate_allocate_credentials (&es->cred))
319
274
!= GNUTLS_E_SUCCESS) {
320
fprintf (stderr, "GnuTLS memory error: %s\n",
275
fprintf (stderr, "memory error: %s\n",
321
276
safer_gnutls_strerror(ret));
322
277
return -1;
323
278
}
324
279
325
280
if(debug){
326
281
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
327
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
328
seckeyfile);
282
" and keyfile %s as GnuTLS credentials\n", certfile,
283
certkey);
329
284
}
330
285
331
286
ret = gnutls_certificate_set_openpgp_key_file
332
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
287
(es->cred, certfile, certkey, GNUTLS_OPENPGP_FMT_BASE64);
333
288
if (ret != GNUTLS_E_SUCCESS) {
334
fprintf(stderr,
335
"Error[%d] while reading the OpenPGP key pair ('%s',"
336
" '%s')\n", ret, pubkeyfile, seckeyfile);
337
fprintf(stdout, "The GnuTLS error is: %s\n",
289
fprintf
290
(stderr, "Error[%d] while reading the OpenPGP key pair ('%s',"
291
" '%s')\n",
292
ret, certfile, certkey);
293
fprintf(stdout, "The Error is: %s\n",
338
294
safer_gnutls_strerror(ret));
339
295
return -1;
340
296
}
341
297
342
/* GnuTLS server initialization */
343
ret = gnutls_dh_params_init(&mc->dh_params);
344
if (ret != GNUTLS_E_SUCCESS) {
345
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
346
" %s\n", safer_gnutls_strerror(ret));
347
return -1;
348
}
349
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
350
if (ret != GNUTLS_E_SUCCESS) {
351
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
352
safer_gnutls_strerror(ret));
353
return -1;
354
}
355
356
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
357
358
return 0;
359
}
360
361
static int init_gnutls_session(mandos_context *mc,
362
gnutls_session_t *session){
363
int ret;
364
/* GnuTLS session creation */
365
ret = gnutls_init(session, GNUTLS_SERVER);
366
if (ret != GNUTLS_E_SUCCESS){
298
//GnuTLS server initialization
299
if ((ret = gnutls_dh_params_init (&es->dh_params))
300
!= GNUTLS_E_SUCCESS) {
301
fprintf (stderr, "Error in dh parameter initialization: %s\n",
302
safer_gnutls_strerror(ret));
303
return -1;
304
}
305
306
if ((ret = gnutls_dh_params_generate2 (es->dh_params, DH_BITS))
307
!= GNUTLS_E_SUCCESS) {
308
fprintf (stderr, "Error in prime generation: %s\n",
309
safer_gnutls_strerror(ret));
310
return -1;
311
}
312
313
gnutls_certificate_set_dh_params (es->cred, es->dh_params);
314
315
// GnuTLS session creation
316
if ((ret = gnutls_init (&es->session, GNUTLS_SERVER))
317
!= GNUTLS_E_SUCCESS){
367
318
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
368
319
safer_gnutls_strerror(ret));
369
320
}
370
321
371
{
372
const char *err;
373
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
374
if (ret != GNUTLS_E_SUCCESS) {
375
fprintf(stderr, "Syntax error at: %s\n", err);
376
fprintf(stderr, "GnuTLS error: %s\n",
377
safer_gnutls_strerror(ret));
378
return -1;
379
}
322
if ((ret = gnutls_priority_set_direct (es->session, "NORMAL", &err))
323
!= GNUTLS_E_SUCCESS) {
324
fprintf(stderr, "Syntax error at: %s\n", err);
325
fprintf(stderr, "GnuTLS error: %s\n",
326
safer_gnutls_strerror(ret));
327
return -1;
380
328
}
381
329
382
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
383
mc->cred);
384
if (ret != GNUTLS_E_SUCCESS) {
385
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
330
if ((ret = gnutls_credentials_set
331
(es->session, GNUTLS_CRD_CERTIFICATE, es->cred))
332
!= GNUTLS_E_SUCCESS) {
333
fprintf(stderr, "Error setting a credentials set: %s\n",
386
334
safer_gnutls_strerror(ret));
387
335
return -1;
388
336
}
389
337
390
338
/* ignore client certificate if any. */
391
gnutls_certificate_server_set_request (*session,
339
gnutls_certificate_server_set_request (es->session,
392
340
GNUTLS_CERT_IGNORE);
393
341
394
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
342
gnutls_dh_set_prime_bits (es->session, DH_BITS);
395
343
396
344
return 0;
397
345
}
398
346
399
/* Avahi log function callback */
400
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
401
__attribute__((unused)) const char *txt){}
347
void empty_log(__attribute__((unused)) AvahiLogLevel level,
348
__attribute__((unused)) const char *txt){}
402
349
403
/* Called when a Mandos server is found */
404
static int start_mandos_communication(const char *ip, uint16_t port,
405
AvahiIfIndex if_index,
406
mandos_context *mc){
350
int start_mandos_communication(const char *ip, uint16_t port,
351
AvahiIfIndex if_index){
407
352
int ret, tcp_sd;
408
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
353
struct sockaddr_in6 to;
354
encrypted_session es;
409
355
char *buffer = NULL;
410
356
char *decrypted_buffer;
411
357
size_t buffer_length = 0;
412
358
size_t buffer_capacity = 0;
413
359
ssize_t decrypted_buffer_size;
414
size_t written;
360
size_t written = 0;
415
361
int retval = 0;
416
362
char interface[IF_NAMESIZE];
417
gnutls_session_t session;
418
419
ret = init_gnutls_session (mc, &session);
420
if (ret != 0){
421
return -1;
422
}
423
363
424
364
if(debug){
425
365
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
431
371
perror("socket");
432
372
return -1;
433
373
}
434
435
if(debug){
436
if(if_indextoname((unsigned int)if_index, interface) == NULL){
374
375
if(if_indextoname((unsigned int)if_index, interface) == NULL){
376
if(debug){
437
377
perror("if_indextoname");
438
return -1;
439
378
}
379
return -1;
380
}
381
382
if(debug){
440
383
fprintf(stderr, "Binding to interface %s\n", interface);
441
384
}
442
385
443
386
memset(&to,0,sizeof(to)); /* Spurious warning */
444
to.in6.sin6_family = AF_INET6;
445
/* It would be nice to have a way to detect if we were passed an
446
IPv4 address here. Now we assume an IPv6 address. */
447
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
387
to.sin6_family = AF_INET6;
388
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
448
389
if (ret < 0 ){
449
390
perror("inet_pton");
450
391
return -1;
451
}
392
}
452
393
if(ret == 0){
453
394
fprintf(stderr, "Bad address: %s\n", ip);
454
395
return -1;
455
396
}
456
to.in6.sin6_port = htons(port); /* Spurious warning */
397
to.sin6_port = htons(port); /* Spurious warning */
457
398
458
to.in6.sin6_scope_id = (uint32_t)if_index;
399
to.sin6_scope_id = (uint32_t)if_index;
459
400
460
401
if(debug){
461
402
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
462
char addrstr[INET6_ADDRSTRLEN] = "";
463
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
464
sizeof(addrstr)) == NULL){
465
perror("inet_ntop");
466
} else {
467
if(strcmp(addrstr, ip) != 0){
468
fprintf(stderr, "Canonical address form: %s\n", addrstr);
469
}
470
}
403
/* char addrstr[INET6_ADDRSTRLEN]; */
404
/* if(inet_ntop(to.sin6_family, &(to.sin6_addr), addrstr, */
405
/* sizeof(addrstr)) == NULL){ */
406
/* perror("inet_ntop"); */
407
/* } else { */
408
/* fprintf(stderr, "Really connecting to: %s, port %d\n", */
409
/* addrstr, ntohs(to.sin6_port)); */
410
/* } */
471
411
}
472
412
473
ret = connect(tcp_sd, &to.in, sizeof(to));
413
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
474
414
if (ret < 0){
475
415
perror("connect");
476
416
return -1;
477
417
}
478
479
const char *out = mandos_protocol_version;
480
written = 0;
481
while (true){
482
size_t out_size = strlen(out);
483
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
484
out_size - written));
485
if (ret == -1){
486
perror("write");
487
retval = -1;
488
goto mandos_end;
489
}
490
written += (size_t)ret;
491
if(written < out_size){
492
continue;
493
} else {
494
if (out == mandos_protocol_version){
495
written = 0;
496
out = "\r\n";
497
} else {
498
break;
499
}
500
}
418
419
ret = initgnutls (&es);
420
if (ret != 0){
421
retval = -1;
422
return -1;
501
423
}
502
424
425
gnutls_transport_set_ptr (es.session,
426
(gnutls_transport_ptr_t) tcp_sd);
427
503
428
if(debug){
504
429
fprintf(stderr, "Establishing TLS session with %s\n", ip);
505
430
}
506
431
507
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
508
509
ret = gnutls_handshake (session);
432
ret = gnutls_handshake (es.session);
510
433
511
434
if (ret != GNUTLS_E_SUCCESS){
512
435
if(debug){
513
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
436
fprintf(stderr, "\n*** Handshake failed ***\n");
514
437
gnutls_perror (ret);
515
438
}
516
439
retval = -1;
517
goto mandos_end;
440
goto exit;
518
441
}
519
442
520
/* Read OpenPGP packet that contains the wanted password */
443
//Retrieve OpenPGP packet that contains the wanted password
521
444
522
445
if(debug){
523
446
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
525
448
}
526
449
527
450
while(true){
528
buffer_capacity = adjustbuffer(&buffer, buffer_length,
529
buffer_capacity);
530
if (buffer_capacity == 0){
531
perror("adjustbuffer");
532
retval = -1;
533
goto mandos_end;
451
if (buffer_length + BUFFER_SIZE > buffer_capacity){
452
buffer = realloc(buffer, buffer_capacity + BUFFER_SIZE);
453
if (buffer == NULL){
454
perror("realloc");
455
goto exit;
456
}
457
buffer_capacity += BUFFER_SIZE;
534
458
}
535
459
536
ret = gnutls_record_recv(session, buffer+buffer_length,
537
BUFFER_SIZE);
460
ret = gnutls_record_recv
461
(es.session, buffer+buffer_length, BUFFER_SIZE);
538
462
if (ret == 0){
539
463
break;
540
464
}
544
468
case GNUTLS_E_AGAIN:
545
469
break;
546
470
case GNUTLS_E_REHANDSHAKE:
547
ret = gnutls_handshake (session);
471
ret = gnutls_handshake (es.session);
548
472
if (ret < 0){
549
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
473
fprintf(stderr, "\n*** Handshake failed ***\n");
550
474
gnutls_perror (ret);
551
475
retval = -1;
552
goto mandos_end;
476
goto exit;
553
477
}
554
478
break;
555
479
default:
556
480
fprintf(stderr, "Unknown error while reading data from"
557
" encrypted session with Mandos server\n");
481
" encrypted session with mandos server\n");
558
482
retval = -1;
559
gnutls_bye (session, GNUTLS_SHUT_RDWR);
560
goto mandos_end;
483
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
484
goto exit;
561
485
}
562
486
} else {
563
487
buffer_length += (size_t) ret;
564
488
}
565
489
}
566
490
567
if(debug){
568
fprintf(stderr, "Closing TLS session\n");
569
}
570
571
gnutls_bye (session, GNUTLS_SHUT_RDWR);
572
573
491
if (buffer_length > 0){
574
492
decrypted_buffer_size = pgp_packet_decrypt(buffer,
575
493
buffer_length,
576
494
&decrypted_buffer,
577
keydir);
495
certdir);
578
496
if (decrypted_buffer_size >= 0){
579
written = 0;
580
497
while(written < (size_t) decrypted_buffer_size){
581
498
ret = (int)fwrite (decrypted_buffer + written, 1,
582
499
(size_t)decrypted_buffer_size - written,
596
513
retval = -1;
597
514
}
598
515
}
599
600
/* Shutdown procedure */
601
602
mandos_end:
516
517
//shutdown procedure
518
519
if(debug){
520
fprintf(stderr, "Closing TLS session\n");
521
}
522
603
523
free(buffer);
524
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
525
exit:
604
526
close(tcp_sd);
605
gnutls_deinit (session);
606
gnutls_certificate_free_credentials (mc->cred);
527
gnutls_deinit (es.session);
528
gnutls_certificate_free_credentials (es.cred);
607
529
gnutls_global_deinit ();
608
530
return retval;
609
531
}
610
532
611
static void resolve_callback(AvahiSServiceResolver *r,
612
AvahiIfIndex interface,
613
AVAHI_GCC_UNUSED AvahiProtocol protocol,
614
AvahiResolverEvent event,
615
const char *name,
616
const char *type,
617
const char *domain,
618
const char *host_name,
619
const AvahiAddress *address,
620
uint16_t port,
621
AVAHI_GCC_UNUSED AvahiStringList *txt,
622
AVAHI_GCC_UNUSED AvahiLookupResultFlags
623
flags,
624
void* userdata) {
625
mandos_context *mc = userdata;
533
static AvahiSimplePoll *simple_poll = NULL;
534
static AvahiServer *server = NULL;
535
536
static void resolve_callback(
537
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
AVAHI_GCC_UNUSED void* userdata) {
550
626
551
assert(r); /* Spurious warning */
627
552
628
553
/* Called whenever a service has been resolved successfully or
631
556
switch (event) {
632
557
default:
633
558
case AVAHI_RESOLVER_FAILURE:
634
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
635
" of type '%s' in domain '%s': %s\n", name, type, domain,
636
avahi_strerror(avahi_server_errno(mc->server)));
559
fprintf(stderr, "(Resolver) Failed to resolve service '%s' of"
560
" type '%s' in domain '%s': %s\n", name, type, domain,
561
avahi_strerror(avahi_server_errno(server)));
637
562
break;
638
563
639
564
case AVAHI_RESOLVER_FOUND:
641
566
char ip[AVAHI_ADDRESS_STR_MAX];
642
567
avahi_address_snprint(ip, sizeof(ip), address);
643
568
if(debug){
644
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %d) on"
645
" port %d\n", name, host_name, ip, interface, port);
569
fprintf(stderr, "Mandos server \"%s\" found on %s (%s) on"
570
" port %d\n", name, host_name, ip, port);
646
571
}
647
int ret = start_mandos_communication(ip, port, interface, mc);
572
int ret = start_mandos_communication(ip, port, interface);
648
573
if (ret == 0){
649
574
exit(EXIT_SUCCESS);
650
575
}
653
578
avahi_s_service_resolver_free(r);
654
579
}
655
580
656
static void browse_callback( AvahiSServiceBrowser *b,
657
AvahiIfIndex interface,
658
AvahiProtocol protocol,
659
AvahiBrowserEvent event,
660
const char *name,
661
const char *type,
662
const char *domain,
663
AVAHI_GCC_UNUSED AvahiLookupResultFlags
664
flags,
665
void* userdata) {
666
mandos_context *mc = userdata;
667
assert(b); /* Spurious warning */
668
669
/* Called whenever a new services becomes available on the LAN or
670
is removed from the LAN */
671
672
switch (event) {
673
default:
674
case AVAHI_BROWSER_FAILURE:
675
676
fprintf(stderr, "(Avahi browser) %s\n",
677
avahi_strerror(avahi_server_errno(mc->server)));
678
avahi_simple_poll_quit(mc->simple_poll);
679
return;
680
681
case AVAHI_BROWSER_NEW:
682
/* We ignore the returned Avahi resolver object. In the callback
683
function we free it. If the Avahi server is terminated before
684
the callback function is called the Avahi server will free the
685
resolver for us. */
686
687
if (!(avahi_s_service_resolver_new(mc->server, interface,
688
protocol, name, type, domain,
689
AVAHI_PROTO_INET6, 0,
690
resolve_callback, mc)))
691
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
692
name, avahi_strerror(avahi_server_errno(mc->server)));
693
break;
694
695
case AVAHI_BROWSER_REMOVE:
696
break;
697
698
case AVAHI_BROWSER_ALL_FOR_NOW:
699
case AVAHI_BROWSER_CACHE_EXHAUSTED:
700
if(debug){
701
fprintf(stderr, "No Mandos server found, still searching...\n");
581
static void browse_callback(
582
AvahiSServiceBrowser *b,
583
AvahiIfIndex interface,
584
AvahiProtocol protocol,
585
AvahiBrowserEvent event,
586
const char *name,
587
const char *type,
588
const char *domain,
589
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
590
void* userdata) {
591
592
AvahiServer *s = userdata;
593
assert(b); /* Spurious warning */
594
595
/* Called whenever a new services becomes available on the LAN or
596
is removed from the LAN */
597
598
switch (event) {
599
default:
600
case AVAHI_BROWSER_FAILURE:
601
602
fprintf(stderr, "(Browser) %s\n",
603
avahi_strerror(avahi_server_errno(server)));
604
avahi_simple_poll_quit(simple_poll);
605
return;
606
607
case AVAHI_BROWSER_NEW:
608
/* We ignore the returned resolver object. In the callback
609
function we free it. If the server is terminated before
610
the callback function is called the server will free
611
the resolver for us. */
612
613
if (!(avahi_s_service_resolver_new(s, interface, protocol, name,
614
type, domain,
615
AVAHI_PROTO_INET6, 0,
616
resolve_callback, s)))
617
fprintf(stderr, "Failed to resolve service '%s': %s\n", name,
618
avahi_strerror(avahi_server_errno(s)));
619
break;
620
621
case AVAHI_BROWSER_REMOVE:
622
break;
623
624
case AVAHI_BROWSER_ALL_FOR_NOW:
625
case AVAHI_BROWSER_CACHE_EXHAUSTED:
626
break;
702
627
}
703
break;
704
}
705
628
}
706
629
707
/* Combines file name and path and returns the malloced new
708
string. some sane checks could/should be added */
709
static const char *combinepath(const char *first, const char *second){
710
size_t f_len = strlen(first);
711
size_t s_len = strlen(second);
712
char *tmp = malloc(f_len + s_len + 2);
630
/* combinds file name and path and returns the malloced new string. som sane checks could/should be added */
631
const char *combinepath(const char *first, const char *second){
632
char *tmp;
633
tmp = malloc(strlen(first) + strlen(second) + 2);
713
634
if (tmp == NULL){
635
perror("malloc");
714
636
return NULL;
715
637
}
716
if(f_len > 0){
717
memcpy(tmp, first, f_len); /* Spurious warning */
718
}
719
tmp[f_len] = '/';
720
if(s_len > 0){
721
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
722
}
723
tmp[f_len + 1 + s_len] = '\0';
638
strcpy(tmp, first);
639
if (first[0] != '\0' and first[strlen(first) - 1] != '/'){
640
strcat(tmp, "/");
641
}
642
strcat(tmp, second);
724
643
return tmp;
725
644
}
726
645
727
646
728
int main(int argc, char *argv[]){
647
int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
648
AvahiServerConfig config;
729
649
AvahiSServiceBrowser *sb = NULL;
730
650
int error;
731
651
int ret;
732
int exitcode = EXIT_SUCCESS;
733
const char *interface = "eth0";
734
struct ifreq network;
735
int sd;
736
uid_t uid;
737
gid_t gid;
652
int returncode = EXIT_SUCCESS;
653
const char *interface = NULL;
654
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
738
655
char *connect_to = NULL;
739
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
740
const char *pubkeyfile = "pubkey.txt";
741
const char *seckeyfile = "seckey.txt";
742
mandos_context mc = { .simple_poll = NULL, .server = NULL,
743
.dh_bits = 1024, .priority = "SECURE256"};
744
745
{
746
struct argp_option options[] = {
747
{ .name = "debug", .key = 128,
748
.doc = "Debug mode", .group = 3 },
749
{ .name = "connect", .key = 'c',
750
.arg = "IP",
751
.doc = "Connect directly to a sepcified mandos server",
752
.group = 1 },
753
{ .name = "interface", .key = 'i',
754
.arg = "INTERFACE",
755
.doc = "Interface that Avahi will conntect through",
756
.group = 1 },
757
{ .name = "keydir", .key = 'd',
758
.arg = "KEYDIR",
759
.doc = "Directory where the openpgp keyring is",
760
.group = 1 },
761
{ .name = "seckey", .key = 's',
762
.arg = "SECKEY",
763
.doc = "Secret openpgp key for gnutls authentication",
764
.group = 1 },
765
{ .name = "pubkey", .key = 'p',
766
.arg = "PUBKEY",
767
.doc = "Public openpgp key for gnutls authentication",
768
.group = 2 },
769
{ .name = "dh-bits", .key = 129,
770
.arg = "BITS",
771
.doc = "dh-bits to use in gnutls communication",
772
.group = 2 },
773
{ .name = "priority", .key = 130,
774
.arg = "PRIORITY",
775
.doc = "GNUTLS priority", .group = 1 },
776
{ .name = NULL }
777
};
778
779
780
error_t parse_opt (int key, char *arg,
781
struct argp_state *state) {
782
/* Get the INPUT argument from `argp_parse', which we know is
783
a pointer to our plugin list pointer. */
784
switch (key) {
785
case 128:
786
debug = true;
787
break;
788
case 'c':
789
connect_to = arg;
790
break;
791
case 'i':
792
interface = arg;
793
break;
794
case 'd':
795
keydir = arg;
796
break;
797
case 's':
798
seckeyfile = arg;
799
break;
800
case 'p':
801
pubkeyfile = arg;
802
break;
803
case 129:
804
errno = 0;
805
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
806
if (errno){
807
perror("strtol");
808
exit(EXIT_FAILURE);
809
}
810
break;
811
case 130:
812
mc.priority = arg;
813
break;
814
case ARGP_KEY_ARG:
815
argp_usage (state);
816
break;
817
case ARGP_KEY_END:
818
break;
819
default:
820
return ARGP_ERR_UNKNOWN;
821
}
822
return 0;
823
}
824
825
struct argp argp = { .options = options, .parser = parse_opt,
826
.args_doc = "",
827
.doc = "Mandos client -- Get and decrypt"
828
" passwords from mandos server" };
829
argp_parse (&argp, argc, argv, 0, 0, NULL);
830
}
831
832
pubkeyfile = combinepath(keydir, pubkeyfile);
833
if (pubkeyfile == NULL){
834
perror("combinepath");
835
exitcode = EXIT_FAILURE;
836
goto end;
837
}
838
839
seckeyfile = combinepath(keydir, seckeyfile);
840
if (seckeyfile == NULL){
841
perror("combinepath");
842
goto end;
843
}
844
845
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
846
if (ret == -1){
847
fprintf(stderr, "init_gnutls_global\n");
848
goto end;
849
}
850
851
uid = getuid();
852
gid = getgid();
853
854
ret = setuid(uid);
855
if (ret == -1){
856
perror("setuid");
857
}
858
859
setgid(gid);
860
if (ret == -1){
861
perror("setgid");
862
}
863
864
if_index = (AvahiIfIndex) if_nametoindex(interface);
865
if(if_index == 0){
866
fprintf(stderr, "No such interface: \"%s\"\n", interface);
867
exit(EXIT_FAILURE);
656
657
while (true){
658
static struct option long_options[] = {
659
{"debug", no_argument, (int *)&debug, 1},
660
{"connect", required_argument, 0, 'C'},
661
{"interface", required_argument, 0, 'i'},
662
{"certdir", required_argument, 0, 'd'},
663
{"certkey", required_argument, 0, 'c'},
664
{"certfile", required_argument, 0, 'k'},
665
{0, 0, 0, 0} };
666
667
int option_index = 0;
668
ret = getopt_long (argc, argv, "i:", long_options,
669
&option_index);
670
671
if (ret == -1){
672
break;
673
}
674
675
switch(ret){
676
case 0:
677
break;
678
case 'i':
679
interface = optarg;
680
break;
681
case 'C':
682
connect_to = optarg;
683
break;
684
case 'd':
685
certdir = optarg;
686
break;
687
case 'c':
688
certfile = optarg;
689
break;
690
case 'k':
691
certkey = optarg;
692
break;
693
default:
694
exit(EXIT_FAILURE);
695
}
696
}
697
698
certfile = combinepath(certdir, certfile);
699
if (certfile == NULL){
700
goto exit;
701
}
702
703
if(interface != NULL){
704
if_index = (AvahiIfIndex) if_nametoindex(interface);
705
if(if_index == 0){
706
fprintf(stderr, "No such interface: \"%s\"\n", interface);
707
exit(EXIT_FAILURE);
708
}
868
709
}
869
710
870
711
if(connect_to != NULL){
873
714
char *address = strrchr(connect_to, ':');
874
715
if(address == NULL){
875
716
fprintf(stderr, "No colon in address\n");
876
exitcode = EXIT_FAILURE;
877
goto end;
717
exit(EXIT_FAILURE);
878
718
}
879
719
errno = 0;
880
720
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
881
721
if(errno){
882
722
perror("Bad port number");
883
exitcode = EXIT_FAILURE;
884
goto end;
723
exit(EXIT_FAILURE);
885
724
}
886
725
*address = '\0';
887
726
address = connect_to;
888
ret = start_mandos_communication(address, port, if_index, &mc);
727
ret = start_mandos_communication(address, port, if_index);
889
728
if(ret < 0){
890
exitcode = EXIT_FAILURE;
729
exit(EXIT_FAILURE);
891
730
} else {
892
exitcode = EXIT_SUCCESS;
731
exit(EXIT_SUCCESS);
893
732
}
894
goto end;
895
733
}
896
734
897
/* If the interface is down, bring it up */
898
{
899
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
900
if(sd < 0) {
901
perror("socket");
902
exitcode = EXIT_FAILURE;
903
goto end;
904
}
905
strcpy(network.ifr_name, interface); /* Spurious warning */
906
ret = ioctl(sd, SIOCGIFFLAGS, &network);
907
if(ret == -1){
908
perror("ioctl SIOCGIFFLAGS");
909
exitcode = EXIT_FAILURE;
910
goto end;
911
}
912
if((network.ifr_flags & IFF_UP) == 0){
913
network.ifr_flags |= IFF_UP;
914
ret = ioctl(sd, SIOCSIFFLAGS, &network);
915
if(ret == -1){
916
perror("ioctl SIOCSIFFLAGS");
917
exitcode = EXIT_FAILURE;
918
goto end;
919
}
920
}
921
close(sd);
735
certkey = combinepath(certdir, certkey);
736
if (certkey == NULL){
737
goto exit;
922
738
}
923
739
924
740
if (not debug){
925
741
avahi_set_log_function(empty_log);
926
742
}
927
743
928
/* Initialize the pseudo-RNG for Avahi */
744
/* Initialize the psuedo-RNG */
929
745
srand((unsigned int) time(NULL));
930
931
/* Allocate main Avahi loop object */
932
mc.simple_poll = avahi_simple_poll_new();
933
if (mc.simple_poll == NULL) {
934
fprintf(stderr, "Avahi: Failed to create simple poll"
935
" object.\n");
936
exitcode = EXIT_FAILURE;
937
goto end;
938
}
939
940
{
941
AvahiServerConfig config;
942
/* Do not publish any local Zeroconf records */
943
avahi_server_config_init(&config);
944
config.publish_hinfo = 0;
945
config.publish_addresses = 0;
946
config.publish_workstation = 0;
947
config.publish_domain = 0;
948
949
/* Allocate a new server */
950
mc.server = avahi_server_new(avahi_simple_poll_get
951
(mc.simple_poll), &config, NULL,
952
NULL, &error);
953
954
/* Free the Avahi configuration data */
955
avahi_server_config_free(&config);
956
}
957
958
/* Check if creating the Avahi server object succeeded */
959
if (mc.server == NULL) {
960
fprintf(stderr, "Failed to create Avahi server: %s\n",
746
747
/* Allocate main loop object */
748
if (!(simple_poll = avahi_simple_poll_new())) {
749
fprintf(stderr, "Failed to create simple poll object.\n");
750
751
goto exit;
752
}
753
754
/* Do not publish any local records */
755
avahi_server_config_init(&config);
756
config.publish_hinfo = 0;
757
config.publish_addresses = 0;
758
config.publish_workstation = 0;
759
config.publish_domain = 0;
760
761
/* Allocate a new server */
762
server = avahi_server_new(avahi_simple_poll_get(simple_poll),
763
&config, NULL, NULL, &error);
764
765
/* Free the configuration data */
766
avahi_server_config_free(&config);
767
768
/* Check if creating the server object succeeded */
769
if (!server) {
770
fprintf(stderr, "Failed to create server: %s\n",
961
771
avahi_strerror(error));
962
exitcode = EXIT_FAILURE;
963
goto end;
772
returncode = EXIT_FAILURE;
773
goto exit;
964
774
}
965
775
966
/* Create the Avahi service browser */
967
sb = avahi_s_service_browser_new(mc.server, if_index,
776
/* Create the service browser */
777
sb = avahi_s_service_browser_new(server, if_index,
968
778
AVAHI_PROTO_INET6,
969
779
"_mandos._tcp", NULL, 0,
970
browse_callback, &mc);
971
if (sb == NULL) {
780
browse_callback, server);
781
if (!sb) {
972
782
fprintf(stderr, "Failed to create service browser: %s\n",
973
avahi_strerror(avahi_server_errno(mc.server)));
974
exitcode = EXIT_FAILURE;
975
goto end;
783
avahi_strerror(avahi_server_errno(server)));
784
returncode = EXIT_FAILURE;
785
goto exit;
976
786
}
977
787
978
788
/* Run the main loop */
979
789
980
790
if (debug){
981
fprintf(stderr, "Starting Avahi loop search\n");
791
fprintf(stderr, "Starting avahi loop search\n");
982
792
}
983
793
984
avahi_simple_poll_loop(mc.simple_poll);
794
avahi_simple_poll_loop(simple_poll);
985
795
986
end:
796
exit:
987
797
988
798
if (debug){
989
799
fprintf(stderr, "%s exiting\n", argv[0]);
990
800
}
991
801
992
802
/* Cleanup things */
993
if (sb != NULL)
803
if (sb)
994
804
avahi_s_service_browser_free(sb);
995
805
996
if (mc.server != NULL)
997
avahi_server_free(mc.server);
806
if (server)
807
avahi_server_free(server);
998
808
999
if (mc.simple_poll != NULL)
1000
avahi_simple_poll_free(mc.simple_poll);
1001
free(pubkeyfile);
1002
free(seckeyfile);
809
if (simple_poll)
810
avahi_simple_poll_free(simple_poll);
811
free(certfile);
812
free(certkey);
1003
813
1004
return exitcode;
814
return returncode;
1005
815
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0