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- Committer: Teddy Hogeborn
- Date: 2008-09-13 15:36:18 UTC
- Revision ID: teddy@fukt.bsnet.se-20080913153618-atp386q2bqj0ku99
* Makefile (install-client-nokey): Do "&&" instead of ";" to catch
errors.
* README: Kill the straight quotes. Add copyright notice.
* overview.xml: Improved wording.
errors.
* README: Kill the straight quotes. Add copyright notice.
* overview.xml: Improved wording.
- files added:
- .bzrignore
- files removed:
- ca.pem
- files renamed:
- server.py => mandos
- server.conf => mandos.conf
- plugbasedclient.c => plugin-runner.c
- plugins.d/mandosclient.c => plugins.d/mandos-client.c
- plugins.d/passprompt.c => plugins.d/password-prompt.c
- files modified:
- Makefile
added
removed
plugins.d/mandos-client.c
32
32
#define _LARGEFILE_SOURCE
33
33
#define _FILE_OFFSET_BITS 64
34
34
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,
41
SIOCSIFFLAGS */
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
36
37
#include <stdio.h> /* fprintf(), stderr, fwrite(),
38
stdout, ferror() */
39
#include <stdint.h> /* uint16_t, uint32_t */
40
#include <stddef.h> /* NULL, size_t, ssize_t */
41
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
42
srand() */
43
#include <stdbool.h> /* bool, true */
44
#include <string.h> /* memset(), strcmp(), strlen(),
45
strerror(), asprintf(), strcpy() */
46
#include <sys/ioctl.h> /* ioctl */
47
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
48
sockaddr_in6, PF_INET6,
49
SOCK_STREAM, INET6_ADDRSTRLEN,
50
uid_t, gid_t, open(), opendir(), DIR */
51
#include <sys/stat.h> /* open() */
52
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
53
struct in6_addr, inet_pton(),
54
connect() */
55
#include <fcntl.h> /* open() */
56
#include <dirent.h> /* opendir(), struct dirent, readdir() */
57
#include <inttypes.h> /* PRIu16 */
58
#include <assert.h> /* assert() */
59
#include <errno.h> /* perror(), errno */
60
#include <time.h> /* time() */
42
61
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
43
SIOCSIFFLAGS */
62
SIOCSIFFLAGS, if_indextoname(),
63
if_nametoindex(), IF_NAMESIZE */
64
#include <netinet/in.h>
65
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
66
getuid(), getgid(), setuid(),
67
setgid() */
68
#include <arpa/inet.h> /* inet_pton(), htons */
69
#include <iso646.h> /* not, and */
70
#include <argp.h> /* struct argp_option, error_t, struct
71
argp_state, struct argp,
72
argp_parse(), ARGP_KEY_ARG,
73
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
44
74
75
/* Avahi */
76
/* All Avahi types, constants and functions
77
Avahi*, avahi_*,
78
AVAHI_* */
45
79
#include <avahi-core/core.h>
46
80
#include <avahi-core/lookup.h>
47
81
#include <avahi-core/log.h>
49
83
#include <avahi-common/malloc.h>
50
84
#include <avahi-common/error.h>
51
85
52
/* Mandos client part */
53
#include <sys/types.h> /* socket(), inet_pton() */
54
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
55
struct in6_addr, inet_pton() */
56
#include <gnutls/gnutls.h> /* All GnuTLS stuff */
57
#include <gnutls/openpgp.h> /* GnuTLS with openpgp stuff */
58
59
#include <unistd.h> /* close() */
60
#include <netinet/in.h>
61
#include <stdbool.h> /* true */
62
#include <string.h> /* memset */
63
#include <arpa/inet.h> /* inet_pton() */
64
#include <iso646.h> /* not */
65
#include <net/if.h> /* IF_NAMESIZE */
86
/* GnuTLS */
87
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
88
functions:
89
gnutls_*
90
init_gnutls_session(),
91
GNUTLS_* */
92
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
93
GNUTLS_OPENPGP_FMT_BASE64 */
66
94
67
95
/* GPGME */
68
#include <errno.h> /* perror() */
69
#include <gpgme.h>
70
71
/* getopt_long */
72
#include <getopt.h>
96
#include <gpgme.h> /* All GPGME types, constants and
97
functions:
98
gpgme_*
99
GPGME_PROTOCOL_OpenPGP,
100
GPG_ERR_NO_* */
73
101
74
102
#define BUFFER_SIZE 256
75
103
76
static const char *keydir = "/conf/conf.d/mandos";
77
static const char *pubkeyfile = "pubkey.txt";
78
static const char *seckeyfile = "seckey.txt";
104
/*
105
#define PATHDIR "/conf/conf.d/mandos"
106
*/
107
108
#define PATHDIR "/conf/conf.d/mandos"
109
#define SECKEY "seckey.txt"
110
#define PUBKEY "pubkey.txt"
79
111
80
112
bool debug = false;
113
static const char mandos_protocol_version[] = "1";
114
const char *argp_program_version = "mandos-client 1.0";
115
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
81
116
82
/* Used for passing in values through all the callback functions */
117
/* Used for passing in values through the Avahi callback functions */
83
118
typedef struct {
84
119
AvahiSimplePoll *simple_poll;
85
120
AvahiServer *server;
86
121
gnutls_certificate_credentials_t cred;
87
122
unsigned int dh_bits;
123
gnutls_dh_params_t dh_params;
88
124
const char *priority;
125
gpgme_ctx_t ctx;
89
126
} mandos_context;
90
127
128
/*
129
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
130
* "buffer_capacity" is how much is currently allocated,
131
* "buffer_length" is how much is already used.
132
*/
133
size_t adjustbuffer(char **buffer, size_t buffer_length,
134
size_t buffer_capacity){
135
if (buffer_length + BUFFER_SIZE > buffer_capacity){
136
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
137
if (buffer == NULL){
138
return 0;
139
}
140
buffer_capacity += BUFFER_SIZE;
141
}
142
return buffer_capacity;
143
}
144
91
145
/*
92
* Decrypt OpenPGP data using keyrings in HOMEDIR.
93
* Returns -1 on error
146
* Initialize GPGME.
94
147
*/
95
static ssize_t pgp_packet_decrypt (const char *cryptotext,
96
size_t crypto_size,
97
char **plaintext,
98
const char *homedir){
99
gpgme_data_t dh_crypto, dh_plain;
100
gpgme_ctx_t ctx;
148
static bool init_gpgme(mandos_context *mc, const char *seckey,
149
const char *pubkey, const char *tempdir){
150
int ret;
101
151
gpgme_error_t rc;
102
ssize_t ret;
103
size_t plaintext_capacity = 0;
104
ssize_t plaintext_length = 0;
105
152
gpgme_engine_info_t engine_info;
106
153
154
155
/*
156
* Helper function to insert pub and seckey to the enigne keyring.
157
*/
158
bool import_key(const char *filename){
159
int fd;
160
gpgme_data_t pgp_data;
161
162
fd = TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
163
if(fd == -1){
164
perror("open");
165
return false;
166
}
167
168
rc = gpgme_data_new_from_fd(&pgp_data, fd);
169
if (rc != GPG_ERR_NO_ERROR){
170
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
171
gpgme_strsource(rc), gpgme_strerror(rc));
172
return false;
173
}
174
175
rc = gpgme_op_import(mc->ctx, pgp_data);
176
if (rc != GPG_ERR_NO_ERROR){
177
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
178
gpgme_strsource(rc), gpgme_strerror(rc));
179
return false;
180
}
181
182
ret = TEMP_FAILURE_RETRY(close(fd));
183
if(ret == -1){
184
perror("close");
185
}
186
gpgme_data_release(pgp_data);
187
return true;
188
}
189
107
190
if (debug){
108
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
191
fprintf(stderr, "Initialize gpgme\n");
109
192
}
110
193
111
194
/* Init GPGME */
114
197
if (rc != GPG_ERR_NO_ERROR){
115
198
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
116
199
gpgme_strsource(rc), gpgme_strerror(rc));
117
return -1;
200
return false;
118
201
}
119
202
120
/* Set GPGME home directory for the OpenPGP engine only */
203
/* Set GPGME home directory for the OpenPGP engine only */
121
204
rc = gpgme_get_engine_info (&engine_info);
122
205
if (rc != GPG_ERR_NO_ERROR){
123
206
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
124
207
gpgme_strsource(rc), gpgme_strerror(rc));
125
return -1;
208
return false;
126
209
}
127
210
while(engine_info != NULL){
128
211
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
129
212
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
130
engine_info->file_name, homedir);
213
engine_info->file_name, tempdir);
131
214
break;
132
215
}
133
216
engine_info = engine_info->next;
134
217
}
135
218
if(engine_info == NULL){
136
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
137
return -1;
219
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
220
return false;
221
}
222
223
/* Create new GPGME "context" */
224
rc = gpgme_new(&(mc->ctx));
225
if (rc != GPG_ERR_NO_ERROR){
226
fprintf(stderr, "bad gpgme_new: %s: %s\n",
227
gpgme_strsource(rc), gpgme_strerror(rc));
228
return false;
229
}
230
231
if (not import_key(pubkey) or not import_key(seckey)){
232
return false;
233
}
234
235
return true;
236
}
237
238
/*
239
* Decrypt OpenPGP data.
240
* Returns -1 on error
241
*/
242
static ssize_t pgp_packet_decrypt (const mandos_context *mc,
243
const char *cryptotext,
244
size_t crypto_size,
245
char **plaintext){
246
gpgme_data_t dh_crypto, dh_plain;
247
gpgme_error_t rc;
248
ssize_t ret;
249
size_t plaintext_capacity = 0;
250
ssize_t plaintext_length = 0;
251
252
if (debug){
253
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
138
254
}
139
255
140
256
/* Create new GPGME data buffer from memory cryptotext */
155
271
return -1;
156
272
}
157
273
158
/* Create new GPGME "context" */
159
rc = gpgme_new(&ctx);
160
if (rc != GPG_ERR_NO_ERROR){
161
fprintf(stderr, "bad gpgme_new: %s: %s\n",
162
gpgme_strsource(rc), gpgme_strerror(rc));
163
plaintext_length = -1;
164
goto decrypt_end;
165
}
166
167
274
/* Decrypt data from the cryptotext data buffer to the plaintext
168
275
data buffer */
169
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
276
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
170
277
if (rc != GPG_ERR_NO_ERROR){
171
278
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
172
279
gpgme_strsource(rc), gpgme_strerror(rc));
173
280
plaintext_length = -1;
281
if (debug){
282
gpgme_decrypt_result_t result;
283
result = gpgme_op_decrypt_result(mc->ctx);
284
if (result == NULL){
285
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
286
} else {
287
fprintf(stderr, "Unsupported algorithm: %s\n",
288
result->unsupported_algorithm);
289
fprintf(stderr, "Wrong key usage: %u\n",
290
result->wrong_key_usage);
291
if(result->file_name != NULL){
292
fprintf(stderr, "File name: %s\n", result->file_name);
293
}
294
gpgme_recipient_t recipient;
295
recipient = result->recipients;
296
if(recipient){
297
while(recipient != NULL){
298
fprintf(stderr, "Public key algorithm: %s\n",
299
gpgme_pubkey_algo_name(recipient->pubkey_algo));
300
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
301
fprintf(stderr, "Secret key available: %s\n",
302
recipient->status == GPG_ERR_NO_SECKEY
303
? "No" : "Yes");
304
recipient = recipient->next;
305
}
306
}
307
}
308
}
174
309
goto decrypt_end;
175
310
}
176
311
178
313
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
179
314
}
180
315
181
if (debug){
182
gpgme_decrypt_result_t result;
183
result = gpgme_op_decrypt_result(ctx);
184
if (result == NULL){
185
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
186
} else {
187
fprintf(stderr, "Unsupported algorithm: %s\n",
188
result->unsupported_algorithm);
189
fprintf(stderr, "Wrong key usage: %d\n",
190
result->wrong_key_usage);
191
if(result->file_name != NULL){
192
fprintf(stderr, "File name: %s\n", result->file_name);
193
}
194
gpgme_recipient_t recipient;
195
recipient = result->recipients;
196
if(recipient){
197
while(recipient != NULL){
198
fprintf(stderr, "Public key algorithm: %s\n",
199
gpgme_pubkey_algo_name(recipient->pubkey_algo));
200
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
201
fprintf(stderr, "Secret key available: %s\n",
202
recipient->status == GPG_ERR_NO_SECKEY
203
? "No" : "Yes");
204
recipient = recipient->next;
205
}
206
}
207
}
208
}
209
210
316
/* Seek back to the beginning of the GPGME plaintext data buffer */
211
317
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
212
perror("pgpme_data_seek");
318
perror("gpgme_data_seek");
213
319
plaintext_length = -1;
214
320
goto decrypt_end;
215
321
}
216
322
217
323
*plaintext = NULL;
218
324
while(true){
219
if (plaintext_length + BUFFER_SIZE
220
> (ssize_t) plaintext_capacity){
221
*plaintext = realloc(*plaintext, plaintext_capacity
222
+ BUFFER_SIZE);
223
if (*plaintext == NULL){
224
perror("realloc");
325
plaintext_capacity = adjustbuffer(plaintext,
326
(size_t)plaintext_length,
327
plaintext_capacity);
328
if (plaintext_capacity == 0){
329
perror("adjustbuffer");
225
330
plaintext_length = -1;
226
331
goto decrypt_end;
227
}
228
plaintext_capacity += BUFFER_SIZE;
229
332
}
230
333
231
334
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
242
345
}
243
346
plaintext_length += ret;
244
347
}
245
348
246
349
if(debug){
247
350
fprintf(stderr, "Decrypted password is: ");
248
351
for(ssize_t i = 0; i < plaintext_length; i++){
262
365
}
263
366
264
367
static const char * safer_gnutls_strerror (int value) {
265
const char *ret = gnutls_strerror (value);
368
const char *ret = gnutls_strerror (value); /* Spurious warning */
266
369
if (ret == NULL)
267
370
ret = "(unknown)";
268
371
return ret;
274
377
fprintf(stderr, "GnuTLS: %s", string);
275
378
}
276
379
277
static int initgnutls(mandos_context *mc, gnutls_session_t *session,
278
gnutls_dh_params_t *dh_params){
380
static int init_gnutls_global(mandos_context *mc,
381
const char *pubkeyfilename,
382
const char *seckeyfilename){
279
383
int ret;
280
384
281
385
if(debug){
282
386
fprintf(stderr, "Initializing GnuTLS\n");
283
387
}
284
285
if ((ret = gnutls_global_init ())
286
!= GNUTLS_E_SUCCESS) {
388
389
ret = gnutls_global_init();
390
if (ret != GNUTLS_E_SUCCESS) {
287
391
fprintf (stderr, "GnuTLS global_init: %s\n",
288
392
safer_gnutls_strerror(ret));
289
393
return -1;
298
402
}
299
403
300
404
/* OpenPGP credentials */
301
if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))
302
!= GNUTLS_E_SUCCESS) {
303
fprintf (stderr, "GnuTLS memory error: %s\n",
405
gnutls_certificate_allocate_credentials(&mc->cred);
406
if (ret != GNUTLS_E_SUCCESS){
407
fprintf (stderr, "GnuTLS memory error: %s\n", /* Spurious
408
warning */
304
409
safer_gnutls_strerror(ret));
410
gnutls_global_deinit ();
305
411
return -1;
306
412
}
307
413
308
414
if(debug){
309
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
310
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
311
seckeyfile);
415
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
416
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
417
seckeyfilename);
312
418
}
313
419
314
420
ret = gnutls_certificate_set_openpgp_key_file
315
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
421
(mc->cred, pubkeyfilename, seckeyfilename,
422
GNUTLS_OPENPGP_FMT_BASE64);
316
423
if (ret != GNUTLS_E_SUCCESS) {
317
424
fprintf(stderr,
318
425
"Error[%d] while reading the OpenPGP key pair ('%s',"
319
" '%s')\n", ret, pubkeyfile, seckeyfile);
320
fprintf(stdout, "The GnuTLS error is: %s\n",
426
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
427
fprintf(stderr, "The GnuTLS error is: %s\n",
321
428
safer_gnutls_strerror(ret));
322
return -1;
429
goto globalfail;
323
430
}
324
431
325
432
/* GnuTLS server initialization */
326
ret = gnutls_dh_params_init(dh_params);
433
ret = gnutls_dh_params_init(&mc->dh_params);
327
434
if (ret != GNUTLS_E_SUCCESS) {
328
435
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
329
436
" %s\n", safer_gnutls_strerror(ret));
330
return -1;
437
goto globalfail;
331
438
}
332
ret = gnutls_dh_params_generate2(*dh_params, mc->dh_bits);
439
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
333
440
if (ret != GNUTLS_E_SUCCESS) {
334
441
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
335
442
safer_gnutls_strerror(ret));
336
return -1;
443
goto globalfail;
337
444
}
338
445
339
gnutls_certificate_set_dh_params(mc->cred, *dh_params);
340
446
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
447
448
return 0;
449
450
globalfail:
451
452
gnutls_certificate_free_credentials(mc->cred);
453
gnutls_global_deinit();
454
gnutls_dh_params_deinit(mc->dh_params);
455
return -1;
456
}
457
458
static int init_gnutls_session(mandos_context *mc,
459
gnutls_session_t *session){
460
int ret;
341
461
/* GnuTLS session creation */
342
462
ret = gnutls_init(session, GNUTLS_SERVER);
343
463
if (ret != GNUTLS_E_SUCCESS){
352
472
fprintf(stderr, "Syntax error at: %s\n", err);
353
473
fprintf(stderr, "GnuTLS error: %s\n",
354
474
safer_gnutls_strerror(ret));
475
gnutls_deinit (*session);
355
476
return -1;
356
477
}
357
478
}
361
482
if (ret != GNUTLS_E_SUCCESS) {
362
483
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
363
484
safer_gnutls_strerror(ret));
485
gnutls_deinit (*session);
364
486
return -1;
365
487
}
366
488
382
504
AvahiIfIndex if_index,
383
505
mandos_context *mc){
384
506
int ret, tcp_sd;
385
struct sockaddr_in6 to;
507
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
386
508
char *buffer = NULL;
387
509
char *decrypted_buffer;
388
510
size_t buffer_length = 0;
389
511
size_t buffer_capacity = 0;
390
512
ssize_t decrypted_buffer_size;
391
size_t written = 0;
513
size_t written;
392
514
int retval = 0;
393
515
char interface[IF_NAMESIZE];
394
516
gnutls_session_t session;
395
gnutls_dh_params_t dh_params;
396
517
397
ret = initgnutls (mc, &session, &dh_params);
518
ret = init_gnutls_session (mc, &session);
398
519
if (ret != 0){
399
520
return -1;
400
521
}
401
522
402
523
if(debug){
403
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
404
ip, port);
524
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
525
"\n", ip, port);
405
526
}
406
527
407
528
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
409
530
perror("socket");
410
531
return -1;
411
532
}
412
533
413
534
if(debug){
414
535
if(if_indextoname((unsigned int)if_index, interface) == NULL){
415
536
perror("if_indextoname");
418
539
fprintf(stderr, "Binding to interface %s\n", interface);
419
540
}
420
541
421
memset(&to,0,sizeof(to)); /* Spurious warning */
422
to.sin6_family = AF_INET6;
542
memset(&to, 0, sizeof(to));
543
to.in6.sin6_family = AF_INET6;
423
544
/* It would be nice to have a way to detect if we were passed an
424
545
IPv4 address here. Now we assume an IPv6 address. */
425
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
546
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
426
547
if (ret < 0 ){
427
548
perror("inet_pton");
428
549
return -1;
431
552
fprintf(stderr, "Bad address: %s\n", ip);
432
553
return -1;
433
554
}
434
to.sin6_port = htons(port); /* Spurious warning */
555
to.in6.sin6_port = htons(port); /* Spurious warning */
435
556
436
to.sin6_scope_id = (uint32_t)if_index;
557
to.in6.sin6_scope_id = (uint32_t)if_index;
437
558
438
559
if(debug){
439
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
560
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
561
port);
440
562
char addrstr[INET6_ADDRSTRLEN] = "";
441
if(inet_ntop(to.sin6_family, &(to.sin6_addr), addrstr,
563
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
442
564
sizeof(addrstr)) == NULL){
443
565
perror("inet_ntop");
444
566
} else {
448
570
}
449
571
}
450
572
451
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
573
ret = connect(tcp_sd, &to.in, sizeof(to));
452
574
if (ret < 0){
453
575
perror("connect");
454
576
return -1;
455
577
}
456
578
579
const char *out = mandos_protocol_version;
580
written = 0;
581
while (true){
582
size_t out_size = strlen(out);
583
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
584
out_size - written));
585
if (ret == -1){
586
perror("write");
587
retval = -1;
588
goto mandos_end;
589
}
590
written += (size_t)ret;
591
if(written < out_size){
592
continue;
593
} else {
594
if (out == mandos_protocol_version){
595
written = 0;
596
out = "\r\n";
597
} else {
598
break;
599
}
600
}
601
}
602
457
603
if(debug){
458
604
fprintf(stderr, "Establishing TLS session with %s\n", ip);
459
605
}
460
606
461
607
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
462
608
463
ret = gnutls_handshake (session);
609
do{
610
ret = gnutls_handshake (session);
611
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
464
612
465
613
if (ret != GNUTLS_E_SUCCESS){
466
614
if(debug){
477
625
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
478
626
ip);
479
627
}
480
628
481
629
while(true){
482
if (buffer_length + BUFFER_SIZE > buffer_capacity){
483
buffer = realloc(buffer, buffer_capacity + BUFFER_SIZE);
484
if (buffer == NULL){
485
perror("realloc");
486
retval = -1;
487
goto mandos_end;
488
}
489
buffer_capacity += BUFFER_SIZE;
630
buffer_capacity = adjustbuffer(&buffer, buffer_length,
631
buffer_capacity);
632
if (buffer_capacity == 0){
633
perror("adjustbuffer");
634
retval = -1;
635
goto mandos_end;
490
636
}
491
637
492
638
ret = gnutls_record_recv(session, buffer+buffer_length,
500
646
case GNUTLS_E_AGAIN:
501
647
break;
502
648
case GNUTLS_E_REHANDSHAKE:
503
ret = gnutls_handshake (session);
649
do{
650
ret = gnutls_handshake (session);
651
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
504
652
if (ret < 0){
505
653
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
506
654
gnutls_perror (ret);
527
675
gnutls_bye (session, GNUTLS_SHUT_RDWR);
528
676
529
677
if (buffer_length > 0){
530
decrypted_buffer_size = pgp_packet_decrypt(buffer,
678
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
531
679
buffer_length,
532
&decrypted_buffer,
533
keydir);
680
&decrypted_buffer);
534
681
if (decrypted_buffer_size >= 0){
682
written = 0;
535
683
while(written < (size_t) decrypted_buffer_size){
536
684
ret = (int)fwrite (decrypted_buffer + written, 1,
537
685
(size_t)decrypted_buffer_size - written,
550
698
} else {
551
699
retval = -1;
552
700
}
701
} else {
702
retval = -1;
553
703
}
554
704
555
705
/* Shutdown procedure */
556
706
557
707
mandos_end:
558
708
free(buffer);
559
close(tcp_sd);
709
ret = TEMP_FAILURE_RETRY(close(tcp_sd));
710
if(ret == -1){
711
perror("close");
712
}
560
713
gnutls_deinit (session);
561
gnutls_certificate_free_credentials (mc->cred);
562
gnutls_global_deinit ();
563
714
return retval;
564
715
}
565
716
578
729
flags,
579
730
void* userdata) {
580
731
mandos_context *mc = userdata;
581
assert(r); /* Spurious warning */
732
assert(r);
582
733
583
734
/* Called whenever a service has been resolved successfully or
584
735
timed out */
596
747
char ip[AVAHI_ADDRESS_STR_MAX];
597
748
avahi_address_snprint(ip, sizeof(ip), address);
598
749
if(debug){
599
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %d) on"
600
" port %d\n", name, host_name, ip, interface, port);
750
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
751
PRIu16 ") on port %d\n", name, host_name, ip,
752
interface, port);
601
753
}
602
754
int ret = start_mandos_communication(ip, port, interface, mc);
603
755
if (ret == 0){
604
exit(EXIT_SUCCESS);
756
avahi_simple_poll_quit(mc->simple_poll);
605
757
}
606
758
}
607
759
}
619
771
flags,
620
772
void* userdata) {
621
773
mandos_context *mc = userdata;
622
assert(b); /* Spurious warning */
774
assert(b);
623
775
624
776
/* Called whenever a new services becomes available on the LAN or
625
777
is removed from the LAN */
659
811
}
660
812
}
661
813
662
/* Combines file name and path and returns the malloced new
663
string. some sane checks could/should be added */
664
static const char *combinepath(const char *first, const char *second){
665
size_t f_len = strlen(first);
666
size_t s_len = strlen(second);
667
char *tmp = malloc(f_len + s_len + 2);
668
if (tmp == NULL){
669
return NULL;
670
}
671
if(f_len > 0){
672
memcpy(tmp, first, f_len); /* Spurious warning */
673
}
674
tmp[f_len] = '/';
675
if(s_len > 0){
676
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
677
}
678
tmp[f_len + 1 + s_len] = '\0';
679
return tmp;
680
}
681
682
683
814
int main(int argc, char *argv[]){
684
815
AvahiSServiceBrowser *sb = NULL;
685
816
int error;
688
819
const char *interface = "eth0";
689
820
struct ifreq network;
690
821
int sd;
822
uid_t uid;
823
gid_t gid;
691
824
char *connect_to = NULL;
825
char tempdir[] = "/tmp/mandosXXXXXX";
692
826
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
827
const char *seckey = PATHDIR "/" SECKEY;
828
const char *pubkey = PATHDIR "/" PUBKEY;
829
693
830
mandos_context mc = { .simple_poll = NULL, .server = NULL,
694
.dh_bits = 1024, .priority = "SECURE256"};
831
.dh_bits = 1024, .priority = "SECURE256"
832
":!CTYPE-X.509:+CTYPE-OPENPGP" };
833
bool gnutls_initalized = false;
834
bool gpgme_initalized = false;
695
835
696
836
{
697
/* Temporary int to get the address of for getopt_long */
698
int debug_int = debug ? 1 : 0;
699
while (true){
700
struct option long_options[] = {
701
{"debug", no_argument, &debug_int, 1},
702
{"connect", required_argument, NULL, 'c'},
703
{"interface", required_argument, NULL, 'i'},
704
{"keydir", required_argument, NULL, 'd'},
705
{"seckey", required_argument, NULL, 's'},
706
{"pubkey", required_argument, NULL, 'p'},
707
{"dh-bits", required_argument, NULL, 'D'},
708
{"priority", required_argument, NULL, 'P'},
709
{0, 0, 0, 0} };
710
711
int option_index = 0;
712
ret = getopt_long (argc, argv, "i:", long_options,
713
&option_index);
714
715
if (ret == -1){
716
break;
717
}
718
719
switch(ret){
720
case 0:
721
break;
722
case 'i':
723
interface = optarg;
724
break;
725
case 'c':
726
connect_to = optarg;
727
break;
728
case 'd':
729
keydir = optarg;
730
break;
731
case 'p':
732
pubkeyfile = optarg;
733
break;
734
case 's':
735
seckeyfile = optarg;
736
break;
737
case 'D':
837
struct argp_option options[] = {
838
{ .name = "debug", .key = 128,
839
.doc = "Debug mode", .group = 3 },
840
{ .name = "connect", .key = 'c',
841
.arg = "ADDRESS:PORT",
842
.doc = "Connect directly to a specific Mandos server",
843
.group = 1 },
844
{ .name = "interface", .key = 'i',
845
.arg = "NAME",
846
.doc = "Interface that will be used to search for Mandos"
847
" servers",
848
.group = 1 },
849
{ .name = "seckey", .key = 's',
850
.arg = "FILE",
851
.doc = "OpenPGP secret key file base name",
852
.group = 1 },
853
{ .name = "pubkey", .key = 'p',
854
.arg = "FILE",
855
.doc = "OpenPGP public key file base name",
856
.group = 2 },
857
{ .name = "dh-bits", .key = 129,
858
.arg = "BITS",
859
.doc = "Bit length of the prime number used in the"
860
" Diffie-Hellman key exchange",
861
.group = 2 },
862
{ .name = "priority", .key = 130,
863
.arg = "STRING",
864
.doc = "GnuTLS priority string for the TLS handshake",
865
.group = 1 },
866
{ .name = NULL }
867
};
868
869
error_t parse_opt (int key, char *arg,
870
struct argp_state *state) {
871
/* Get the INPUT argument from `argp_parse', which we know is
872
a pointer to our plugin list pointer. */
873
switch (key) {
874
case 128: /* --debug */
875
debug = true;
876
break;
877
case 'c': /* --connect */
878
connect_to = arg;
879
break;
880
case 'i': /* --interface */
881
interface = arg;
882
break;
883
case 's': /* --seckey */
884
seckey = arg;
885
break;
886
case 'p': /* --pubkey */
887
pubkey = arg;
888
break;
889
case 129: /* --dh-bits */
738
890
errno = 0;
739
mc.dh_bits = (unsigned int) strtol(optarg, NULL, 10);
891
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
740
892
if (errno){
741
893
perror("strtol");
742
894
exit(EXIT_FAILURE);
743
895
}
744
896
break;
745
case 'P':
746
mc.priority = optarg;
747
break;
748
case '?':
897
case 130: /* --priority */
898
mc.priority = arg;
899
break;
900
case ARGP_KEY_ARG:
901
argp_usage (state);
902
case ARGP_KEY_END:
903
break;
749
904
default:
750
/* getopt_long() has already printed a message about the
751
unrcognized option, so just exit. */
752
exit(EXIT_FAILURE);
753
}
754
}
755
/* Set the global debug flag from the temporary int */
756
debug = debug_int ? true : false;
757
}
758
759
pubkeyfile = combinepath(keydir, pubkeyfile);
760
if (pubkeyfile == NULL){
761
perror("combinepath");
762
exitcode = EXIT_FAILURE;
763
goto end;
764
}
765
766
seckeyfile = combinepath(keydir, seckeyfile);
767
if (seckeyfile == NULL){
768
perror("combinepath");
769
goto end;
905
return ARGP_ERR_UNKNOWN;
906
}
907
return 0;
908
}
909
910
struct argp argp = { .options = options, .parser = parse_opt,
911
.args_doc = "",
912
.doc = "Mandos client -- Get and decrypt"
913
" passwords from a Mandos server" };
914
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
915
if (ret == ARGP_ERR_UNKNOWN){
916
fprintf(stderr, "Unknown error while parsing arguments\n");
917
exitcode = EXIT_FAILURE;
918
goto end;
919
}
920
}
921
922
/* If the interface is down, bring it up */
923
{
924
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
925
if(sd < 0) {
926
perror("socket");
927
exitcode = EXIT_FAILURE;
928
goto end;
929
}
930
strcpy(network.ifr_name, interface);
931
ret = ioctl(sd, SIOCGIFFLAGS, &network);
932
if(ret == -1){
933
perror("ioctl SIOCGIFFLAGS");
934
exitcode = EXIT_FAILURE;
935
goto end;
936
}
937
if((network.ifr_flags & IFF_UP) == 0){
938
network.ifr_flags |= IFF_UP;
939
ret = ioctl(sd, SIOCSIFFLAGS, &network);
940
if(ret == -1){
941
perror("ioctl SIOCSIFFLAGS");
942
exitcode = EXIT_FAILURE;
943
goto end;
944
}
945
}
946
ret = TEMP_FAILURE_RETRY(close(sd));
947
if(ret == -1){
948
perror("close");
949
}
950
}
951
952
uid = getuid();
953
gid = getgid();
954
955
ret = setuid(uid);
956
if (ret == -1){
957
perror("setuid");
958
}
959
960
setgid(gid);
961
if (ret == -1){
962
perror("setgid");
963
}
964
965
ret = init_gnutls_global(&mc, pubkey, seckey);
966
if (ret == -1){
967
fprintf(stderr, "init_gnutls_global failed\n");
968
exitcode = EXIT_FAILURE;
969
goto end;
970
} else {
971
gnutls_initalized = true;
972
}
973
974
if(mkdtemp(tempdir) == NULL){
975
perror("mkdtemp");
976
tempdir[0] = '\0';
977
goto end;
978
}
979
980
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
981
fprintf(stderr, "gpgme_initalized failed\n");
982
exitcode = EXIT_FAILURE;
983
goto end;
984
} else {
985
gpgme_initalized = true;
770
986
}
771
987
772
988
if_index = (AvahiIfIndex) if_nametoindex(interface);
781
997
char *address = strrchr(connect_to, ':');
782
998
if(address == NULL){
783
999
fprintf(stderr, "No colon in address\n");
784
exit(EXIT_FAILURE);
1000
exitcode = EXIT_FAILURE;
1001
goto end;
785
1002
}
786
1003
errno = 0;
787
1004
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
788
1005
if(errno){
789
1006
perror("Bad port number");
790
exit(EXIT_FAILURE);
1007
exitcode = EXIT_FAILURE;
1008
goto end;
791
1009
}
792
1010
*address = '\0';
793
1011
address = connect_to;
794
1012
ret = start_mandos_communication(address, port, if_index, &mc);
795
1013
if(ret < 0){
796
exit(EXIT_FAILURE);
1014
exitcode = EXIT_FAILURE;
797
1015
} else {
798
exit(EXIT_SUCCESS);
799
}
800
}
801
802
/* If the interface is down, bring it up */
803
{
804
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
805
if(sd < 0) {
806
perror("socket");
807
exitcode = EXIT_FAILURE;
808
goto end;
809
}
810
strcpy(network.ifr_name, interface); /* Spurious warning */
811
ret = ioctl(sd, SIOCGIFFLAGS, &network);
812
if(ret == -1){
813
perror("ioctl SIOCGIFFLAGS");
814
exitcode = EXIT_FAILURE;
815
goto end;
816
}
817
if((network.ifr_flags & IFF_UP) == 0){
818
network.ifr_flags |= IFF_UP;
819
ret = ioctl(sd, SIOCSIFFLAGS, &network);
820
if(ret == -1){
821
perror("ioctl SIOCSIFFLAGS");
822
exitcode = EXIT_FAILURE;
823
goto end;
824
}
825
}
826
close(sd);
1016
exitcode = EXIT_SUCCESS;
1017
}
1018
goto end;
827
1019
}
828
1020
829
1021
if (not debug){
841
1033
exitcode = EXIT_FAILURE;
842
1034
goto end;
843
1035
}
844
1036
845
1037
{
846
1038
AvahiServerConfig config;
847
1039
/* Do not publish any local Zeroconf records */
850
1042
config.publish_addresses = 0;
851
1043
config.publish_workstation = 0;
852
1044
config.publish_domain = 0;
853
1045
854
1046
/* Allocate a new server */
855
1047
mc.server = avahi_server_new(avahi_simple_poll_get
856
1048
(mc.simple_poll), &config, NULL,
857
1049
NULL, &error);
858
1050
859
1051
/* Free the Avahi configuration data */
860
1052
avahi_server_config_free(&config);
861
1053
}
881
1073
}
882
1074
883
1075
/* Run the main loop */
884
1076
885
1077
if (debug){
886
1078
fprintf(stderr, "Starting Avahi loop search\n");
887
1079
}
889
1081
avahi_simple_poll_loop(mc.simple_poll);
890
1082
891
1083
end:
892
1084
893
1085
if (debug){
894
1086
fprintf(stderr, "%s exiting\n", argv[0]);
895
1087
}
900
1092
901
1093
if (mc.server != NULL)
902
1094
avahi_server_free(mc.server);
903
1095
904
1096
if (mc.simple_poll != NULL)
905
1097
avahi_simple_poll_free(mc.simple_poll);
906
free(pubkeyfile);
907
free(seckeyfile);
908
1098
1099
if (gnutls_initalized){
1100
gnutls_certificate_free_credentials(mc.cred);
1101
gnutls_global_deinit ();
1102
gnutls_dh_params_deinit(mc.dh_params);
1103
}
1104
1105
if(gpgme_initalized){
1106
gpgme_release(mc.ctx);
1107
}
1108
1109
/* Removes the temp directory used by GPGME */
1110
if(tempdir[0] != '\0'){
1111
DIR *d;
1112
struct dirent *direntry;
1113
d = opendir(tempdir);
1114
if(d == NULL){
1115
perror("opendir");
1116
} else {
1117
while(true){
1118
direntry = readdir(d);
1119
if(direntry == NULL){
1120
break;
1121
}
1122
if (direntry->d_type == DT_REG){
1123
char *fullname = NULL;
1124
ret = asprintf(&fullname, "%s/%s", tempdir,
1125
direntry->d_name);
1126
if(ret < 0){
1127
perror("asprintf");
1128
continue;
1129
}
1130
ret = unlink(fullname);
1131
if(ret == -1){
1132
fprintf(stderr, "unlink(\"%s\"): %s",
1133
fullname, strerror(errno));
1134
}
1135
free(fullname);
1136
}
1137
}
1138
closedir(d);
1139
}
1140
ret = rmdir(tempdir);
1141
if(ret == -1){
1142
perror("rmdir");
1143
}
1144
}
1145
909
1146
return exitcode;
910
1147
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0