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- Committer: Björn Påhlsson
- Date: 2008-08-02 21:06:29 UTC
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 38.
- Revision ID: belorn@braxen-20080802210629-p9jc5515yufcg4ge
not working midwork...
- files added:
- ca.pem
- files removed:
- COPYING
- files renamed:
- plugin-runner.c => plugbasedclient.c
- plugins.d/password-request.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
32
32
#define _LARGEFILE_SOURCE
33
33
#define _FILE_OFFSET_BITS 64
34
34
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 */
51
#include <inttypes.h> /* PRIu16 */
52
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
53
struct in6_addr, inet_pton(),
54
connect() */
55
#include <assert.h> /* assert() */
56
#include <errno.h> /* perror(), errno */
57
#include <time.h> /* time() */
58
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
59
SIOCSIFFLAGS, if_indextoname(),
60
if_nametoindex(), IF_NAMESIZE */
61
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
62
getuid(), getgid(), setuid(),
63
setgid() */
64
#include <netinet/in.h>
65
#include <arpa/inet.h> /* inet_pton(), htons */
66
#include <iso646.h> /* not, and */
67
#include <argp.h> /* struct argp_option, error_t, struct
68
argp_state, struct argp,
69
argp_parse(), ARGP_KEY_ARG,
70
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
71
72
/* Avahi */
73
/* All Avahi types, constants and functions
74
Avahi*, avahi_*,
75
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
76
43
#include <avahi-core/core.h>
77
44
#include <avahi-core/lookup.h>
78
45
#include <avahi-core/log.h>
80
47
#include <avahi-common/malloc.h>
81
48
#include <avahi-common/error.h>
82
49
83
/* GnuTLS */
84
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
85
functions:
86
gnutls_*
87
init_gnutls_session(),
88
GNUTLS_* */
89
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
90
GNUTLS_OPENPGP_FMT_BASE64 */
91
92
/* GPGME */
93
#include <gpgme.h> /* All GPGME types, constants and
94
functions:
95
gpgme_*
96
GPGME_PROTOCOL_OpenPGP,
97
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>
98
70
99
71
#define BUFFER_SIZE 256
72
#define DH_BITS 1024
73
74
static const char *certdir = "/conf/conf.d/mandos";
75
static const char *certfile = "openpgp-client.txt";
76
static const char *certkey = "openpgp-client-key.txt";
100
77
101
78
bool debug = false;
102
static const char *keydir = "/conf/conf.d/mandos";
103
static const char mandos_protocol_version[] = "1";
104
const char *argp_program_version = "password-request 1.0";
105
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
106
79
107
/* Used for passing in values through the Avahi callback functions */
108
80
typedef struct {
109
81
AvahiSimplePoll *simple_poll;
110
82
AvahiServer *server;
111
83
gnutls_certificate_credentials_t cred;
112
84
unsigned int dh_bits;
113
gnutls_dh_params_t dh_params;
114
85
const char *priority;
115
86
} mandos_context;
116
87
117
/*
118
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
119
* "buffer_capacity" is how much is currently allocated,
120
* "buffer_length" is how much is already used.
121
*/
122
size_t adjustbuffer(char **buffer, size_t buffer_length,
123
size_t buffer_capacity){
124
if (buffer_length + BUFFER_SIZE > buffer_capacity){
125
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
126
if (buffer == NULL){
127
return 0;
128
}
129
buffer_capacity += BUFFER_SIZE;
130
}
131
return buffer_capacity;
132
}
133
134
/*
135
* Decrypt OpenPGP data using keyrings in HOMEDIR.
136
* Returns -1 on error
137
*/
138
static ssize_t pgp_packet_decrypt (const char *cryptotext,
139
size_t crypto_size,
140
char **plaintext,
88
static ssize_t pgp_packet_decrypt (char *packet, size_t packet_size,
89
char **new_packet,
141
90
const char *homedir){
142
91
gpgme_data_t dh_crypto, dh_plain;
143
92
gpgme_ctx_t ctx;
144
93
gpgme_error_t rc;
145
94
ssize_t ret;
146
size_t plaintext_capacity = 0;
147
ssize_t plaintext_length = 0;
95
ssize_t new_packet_capacity = 0;
96
ssize_t new_packet_length = 0;
148
97
gpgme_engine_info_t engine_info;
149
98
150
99
if (debug){
151
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
100
fprintf(stderr, "Trying to decrypt OpenPGP packet\n");
152
101
}
153
102
154
103
/* Init GPGME */
160
109
return -1;
161
110
}
162
111
163
/* Set GPGME home directory for the OpenPGP engine only */
112
/* Set GPGME home directory */
164
113
rc = gpgme_get_engine_info (&engine_info);
165
114
if (rc != GPG_ERR_NO_ERROR){
166
115
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
176
125
engine_info = engine_info->next;
177
126
}
178
127
if(engine_info == NULL){
179
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
128
fprintf(stderr, "Could not set home dir to %s\n", homedir);
180
129
return -1;
181
130
}
182
131
183
/* Create new GPGME data buffer from memory cryptotext */
184
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
185
0);
132
/* Create new GPGME data buffer from packet buffer */
133
rc = gpgme_data_new_from_mem(&dh_crypto, packet, packet_size, 0);
186
134
if (rc != GPG_ERR_NO_ERROR){
187
135
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
188
136
gpgme_strsource(rc), gpgme_strerror(rc));
194
142
if (rc != GPG_ERR_NO_ERROR){
195
143
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
196
144
gpgme_strsource(rc), gpgme_strerror(rc));
197
gpgme_data_release(dh_crypto);
198
145
return -1;
199
146
}
200
147
203
150
if (rc != GPG_ERR_NO_ERROR){
204
151
fprintf(stderr, "bad gpgme_new: %s: %s\n",
205
152
gpgme_strsource(rc), gpgme_strerror(rc));
206
plaintext_length = -1;
207
goto decrypt_end;
153
return -1;
208
154
}
209
155
210
/* Decrypt data from the cryptotext data buffer to the plaintext
211
data buffer */
156
/* Decrypt data from the FILE pointer to the plaintext data
157
buffer */
212
158
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
213
159
if (rc != GPG_ERR_NO_ERROR){
214
160
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
215
161
gpgme_strsource(rc), gpgme_strerror(rc));
216
plaintext_length = -1;
217
goto decrypt_end;
162
return -1;
218
163
}
219
164
220
165
if(debug){
221
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
166
fprintf(stderr, "Decryption of OpenPGP packet succeeded\n");
222
167
}
223
168
224
169
if (debug){
225
170
gpgme_decrypt_result_t result;
226
171
result = gpgme_op_decrypt_result(ctx);
229
174
} else {
230
175
fprintf(stderr, "Unsupported algorithm: %s\n",
231
176
result->unsupported_algorithm);
232
fprintf(stderr, "Wrong key usage: %u\n",
177
fprintf(stderr, "Wrong key usage: %d\n",
233
178
result->wrong_key_usage);
234
179
if(result->file_name != NULL){
235
180
fprintf(stderr, "File name: %s\n", result->file_name);
250
195
}
251
196
}
252
197
198
/* Delete the GPGME FILE pointer cryptotext data buffer */
199
gpgme_data_release(dh_crypto);
200
253
201
/* Seek back to the beginning of the GPGME plaintext data buffer */
254
202
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
255
203
perror("pgpme_data_seek");
256
plaintext_length = -1;
257
goto decrypt_end;
258
204
}
259
205
260
*plaintext = NULL;
206
*new_packet = 0;
261
207
while(true){
262
plaintext_capacity = adjustbuffer(plaintext,
263
(size_t)plaintext_length,
264
plaintext_capacity);
265
if (plaintext_capacity == 0){
266
perror("adjustbuffer");
267
plaintext_length = -1;
268
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;
269
217
}
270
218
271
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
219
ret = gpgme_data_read(dh_plain, *new_packet + new_packet_length,
272
220
BUFFER_SIZE);
273
221
/* Print the data, if any */
274
222
if (ret == 0){
275
/* EOF */
276
223
break;
277
224
}
278
225
if(ret < 0){
279
226
perror("gpgme_data_read");
280
plaintext_length = -1;
281
goto decrypt_end;
227
return -1;
282
228
}
283
plaintext_length += ret;
229
new_packet_length += ret;
284
230
}
285
231
286
if(debug){
287
fprintf(stderr, "Decrypted password is: ");
288
for(ssize_t i = 0; i < plaintext_length; i++){
289
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
290
}
291
fprintf(stderr, "\n");
292
}
293
294
decrypt_end:
295
296
/* Delete the GPGME cryptotext data buffer */
297
gpgme_data_release(dh_crypto);
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
/* } */
298
239
299
240
/* Delete the GPGME plaintext data buffer */
300
241
gpgme_data_release(dh_plain);
301
return plaintext_length;
242
return new_packet_length;
302
243
}
303
244
304
245
static const char * safer_gnutls_strerror (int value) {
305
const char *ret = gnutls_strerror (value); /* Spurious warning */
246
const char *ret = gnutls_strerror (value);
306
247
if (ret == NULL)
307
248
ret = "(unknown)";
308
249
return ret;
309
250
}
310
251
311
/* GnuTLS log function callback */
312
252
static void debuggnutls(__attribute__((unused)) int level,
313
253
const char* string){
314
fprintf(stderr, "GnuTLS: %s", string);
254
fprintf(stderr, "%s", string);
315
255
}
316
256
317
static int init_gnutls_global(mandos_context *mc,
318
const char *pubkeyfilename,
319
const char *seckeyfilename){
257
static int initgnutls(mandos_context *mc){
258
const char *err;
320
259
int ret;
321
260
322
261
if(debug){
323
262
fprintf(stderr, "Initializing GnuTLS\n");
324
263
}
325
326
ret = gnutls_global_init();
327
if (ret != GNUTLS_E_SUCCESS) {
328
fprintf (stderr, "GnuTLS global_init: %s\n",
329
safer_gnutls_strerror(ret));
264
265
if ((ret = gnutls_global_init ())
266
!= GNUTLS_E_SUCCESS) {
267
fprintf (stderr, "global_init: %s\n", safer_gnutls_strerror(ret));
330
268
return -1;
331
269
}
332
270
333
271
if (debug){
334
/* "Use a log level over 10 to enable all debugging options."
335
* - GnuTLS manual
336
*/
337
272
gnutls_global_set_log_level(11);
338
273
gnutls_global_set_log_function(debuggnutls);
339
274
}
340
275
341
/* OpenPGP credentials */
342
gnutls_certificate_allocate_credentials(&mc->cred);
343
if (ret != GNUTLS_E_SUCCESS){
344
fprintf (stderr, "GnuTLS memory error: %s\n", /* Spurious
345
warning */
276
/* openpgp credentials */
277
if ((ret = gnutls_certificate_allocate_credentials (&es->cred))
278
!= GNUTLS_E_SUCCESS) {
279
fprintf (stderr, "memory error: %s\n",
346
280
safer_gnutls_strerror(ret));
347
gnutls_global_deinit ();
348
281
return -1;
349
282
}
350
283
351
284
if(debug){
352
285
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
353
" and keyfile %s as GnuTLS credentials\n", pubkeyfilename,
354
seckeyfilename);
286
" and keyfile %s as GnuTLS credentials\n", certfile,
287
certkey);
355
288
}
356
289
357
290
ret = gnutls_certificate_set_openpgp_key_file
358
(mc->cred, pubkeyfilename, seckeyfilename,
359
GNUTLS_OPENPGP_FMT_BASE64);
291
(es->cred, certfile, certkey, GNUTLS_OPENPGP_FMT_BASE64);
360
292
if (ret != GNUTLS_E_SUCCESS) {
361
fprintf(stderr,
362
"Error[%d] while reading the OpenPGP key pair ('%s',"
363
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
364
fprintf(stdout, "The GnuTLS error is: %s\n",
293
fprintf
294
(stderr, "Error[%d] while reading the OpenPGP key pair ('%s',"
295
" '%s')\n",
296
ret, certfile, certkey);
297
fprintf(stdout, "The Error is: %s\n",
365
298
safer_gnutls_strerror(ret));
366
goto globalfail;
367
}
368
369
/* GnuTLS server initialization */
370
ret = gnutls_dh_params_init(&mc->dh_params);
371
if (ret != GNUTLS_E_SUCCESS) {
372
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
373
" %s\n", safer_gnutls_strerror(ret));
374
goto globalfail;
375
}
376
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
377
if (ret != GNUTLS_E_SUCCESS) {
378
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
379
safer_gnutls_strerror(ret));
380
goto globalfail;
381
}
382
383
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
384
385
return 0;
386
387
globalfail:
388
389
gnutls_certificate_free_credentials(mc->cred);
390
gnutls_global_deinit();
391
return -1;
392
393
}
394
395
static int init_gnutls_session(mandos_context *mc,
396
gnutls_session_t *session){
397
int ret;
398
/* GnuTLS session creation */
399
ret = gnutls_init(session, GNUTLS_SERVER);
400
if (ret != GNUTLS_E_SUCCESS){
299
return -1;
300
}
301
302
//GnuTLS server initialization
303
if ((ret = gnutls_dh_params_init (&es->dh_params))
304
!= GNUTLS_E_SUCCESS) {
305
fprintf (stderr, "Error in dh parameter initialization: %s\n",
306
safer_gnutls_strerror(ret));
307
return -1;
308
}
309
310
if ((ret = gnutls_dh_params_generate2 (es->dh_params, DH_BITS))
311
!= GNUTLS_E_SUCCESS) {
312
fprintf (stderr, "Error in prime generation: %s\n",
313
safer_gnutls_strerror(ret));
314
return -1;
315
}
316
317
gnutls_certificate_set_dh_params (es->cred, es->dh_params);
318
319
// GnuTLS session creation
320
if ((ret = gnutls_init (&es->session, GNUTLS_SERVER))
321
!= GNUTLS_E_SUCCESS){
401
322
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
402
323
safer_gnutls_strerror(ret));
403
324
}
404
325
405
{
406
const char *err;
407
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
408
if (ret != GNUTLS_E_SUCCESS) {
409
fprintf(stderr, "Syntax error at: %s\n", err);
410
fprintf(stderr, "GnuTLS error: %s\n",
411
safer_gnutls_strerror(ret));
412
gnutls_deinit (*session);
413
return -1;
414
}
326
if ((ret = gnutls_priority_set_direct (es->session, mc->priority, &err))
327
!= GNUTLS_E_SUCCESS) {
328
fprintf(stderr, "Syntax error at: %s\n", err);
329
fprintf(stderr, "GnuTLS error: %s\n",
330
safer_gnutls_strerror(ret));
331
return -1;
415
332
}
416
333
417
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
418
mc->cred);
419
if (ret != GNUTLS_E_SUCCESS) {
420
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
334
if ((ret = gnutls_credentials_set
335
(es->session, GNUTLS_CRD_CERTIFICATE, es->cred))
336
!= GNUTLS_E_SUCCESS) {
337
fprintf(stderr, "Error setting a credentials set: %s\n",
421
338
safer_gnutls_strerror(ret));
422
gnutls_deinit (*session);
423
339
return -1;
424
340
}
425
341
426
342
/* ignore client certificate if any. */
427
gnutls_certificate_server_set_request (*session,
343
gnutls_certificate_server_set_request (es->session,
428
344
GNUTLS_CERT_IGNORE);
429
345
430
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
346
gnutls_dh_set_prime_bits (es->session, DH_BITS);
431
347
432
348
return 0;
433
349
}
434
350
435
/* Avahi log function callback */
436
351
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
437
352
__attribute__((unused)) const char *txt){}
438
353
439
/* Called when a Mandos server is found */
440
354
static int start_mandos_communication(const char *ip, uint16_t port,
441
355
AvahiIfIndex if_index,
442
356
mandos_context *mc){
443
357
int ret, tcp_sd;
444
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
358
struct sockaddr_in6 to;
359
encrypted_session es;
445
360
char *buffer = NULL;
446
361
char *decrypted_buffer;
447
362
size_t buffer_length = 0;
448
363
size_t buffer_capacity = 0;
449
364
ssize_t decrypted_buffer_size;
450
size_t written;
365
size_t written = 0;
451
366
int retval = 0;
452
367
char interface[IF_NAMESIZE];
453
gnutls_session_t session;
454
455
ret = init_gnutls_session (mc, &session);
456
if (ret != 0){
457
return -1;
458
}
459
368
460
369
if(debug){
461
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
462
"\n", ip, port);
370
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
371
ip, port);
463
372
}
464
373
465
374
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
470
379
471
380
if(debug){
472
381
if(if_indextoname((unsigned int)if_index, interface) == NULL){
473
perror("if_indextoname");
382
if(debug){
383
perror("if_indextoname");
384
}
474
385
return -1;
475
386
}
387
476
388
fprintf(stderr, "Binding to interface %s\n", interface);
477
389
}
478
390
479
memset(&to, 0, sizeof(to));
480
to.in6.sin6_family = AF_INET6;
481
/* It would be nice to have a way to detect if we were passed an
482
IPv4 address here. Now we assume an IPv6 address. */
483
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
391
memset(&to,0,sizeof(to)); /* Spurious warning */
392
to.sin6_family = AF_INET6;
393
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
484
394
if (ret < 0 ){
485
395
perror("inet_pton");
486
396
return -1;
487
}
397
}
488
398
if(ret == 0){
489
399
fprintf(stderr, "Bad address: %s\n", ip);
490
400
return -1;
491
401
}
492
to.in6.sin6_port = htons(port); /* Spurious warning */
402
to.sin6_port = htons(port); /* Spurious warning */
493
403
494
to.in6.sin6_scope_id = (uint32_t)if_index;
404
to.sin6_scope_id = (uint32_t)if_index;
495
405
496
406
if(debug){
497
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
498
port);
499
char addrstr[INET6_ADDRSTRLEN] = "";
500
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
501
sizeof(addrstr)) == NULL){
502
perror("inet_ntop");
503
} else {
504
if(strcmp(addrstr, ip) != 0){
505
fprintf(stderr, "Canonical address form: %s\n", addrstr);
506
}
507
}
407
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
408
/* char addrstr[INET6_ADDRSTRLEN]; */
409
/* if(inet_ntop(to.sin6_family, &(to.sin6_addr), addrstr, */
410
/* sizeof(addrstr)) == NULL){ */
411
/* perror("inet_ntop"); */
412
/* } else { */
413
/* fprintf(stderr, "Really connecting to: %s, port %d\n", */
414
/* addrstr, ntohs(to.sin6_port)); */
415
/* } */
508
416
}
509
417
510
ret = connect(tcp_sd, &to.in, sizeof(to));
418
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
511
419
if (ret < 0){
512
420
perror("connect");
513
421
return -1;
514
422
}
515
516
const char *out = mandos_protocol_version;
517
written = 0;
518
while (true){
519
size_t out_size = strlen(out);
520
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
521
out_size - written));
522
if (ret == -1){
523
perror("write");
524
retval = -1;
525
goto mandos_end;
526
}
527
written += (size_t)ret;
528
if(written < out_size){
529
continue;
530
} else {
531
if (out == mandos_protocol_version){
532
written = 0;
533
out = "\r\n";
534
} else {
535
break;
536
}
537
}
423
424
ret = initgnutls (&es);
425
if (ret != 0){
426
retval = -1;
427
return -1;
538
428
}
539
429
430
gnutls_transport_set_ptr (es.session,
431
(gnutls_transport_ptr_t) tcp_sd);
432
540
433
if(debug){
541
434
fprintf(stderr, "Establishing TLS session with %s\n", ip);
542
435
}
543
436
544
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
545
546
do{
547
ret = gnutls_handshake (session);
548
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
437
ret = gnutls_handshake (es.session);
549
438
550
439
if (ret != GNUTLS_E_SUCCESS){
551
440
if(debug){
552
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
441
fprintf(stderr, "\n*** Handshake failed ***\n");
553
442
gnutls_perror (ret);
554
443
}
555
444
retval = -1;
556
goto mandos_end;
445
goto exit;
557
446
}
558
447
559
/* Read OpenPGP packet that contains the wanted password */
448
//Retrieve OpenPGP packet that contains the wanted password
560
449
561
450
if(debug){
562
451
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
564
453
}
565
454
566
455
while(true){
567
buffer_capacity = adjustbuffer(&buffer, buffer_length,
568
buffer_capacity);
569
if (buffer_capacity == 0){
570
perror("adjustbuffer");
571
retval = -1;
572
goto mandos_end;
456
if (buffer_length + BUFFER_SIZE > buffer_capacity){
457
buffer = realloc(buffer, buffer_capacity + BUFFER_SIZE);
458
if (buffer == NULL){
459
perror("realloc");
460
goto exit;
461
}
462
buffer_capacity += BUFFER_SIZE;
573
463
}
574
464
575
ret = gnutls_record_recv(session, buffer+buffer_length,
576
BUFFER_SIZE);
465
ret = gnutls_record_recv
466
(es.session, buffer+buffer_length, BUFFER_SIZE);
577
467
if (ret == 0){
578
468
break;
579
469
}
583
473
case GNUTLS_E_AGAIN:
584
474
break;
585
475
case GNUTLS_E_REHANDSHAKE:
586
do{
587
ret = gnutls_handshake (session);
588
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
476
ret = gnutls_handshake (es.session);
589
477
if (ret < 0){
590
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
478
fprintf(stderr, "\n*** Handshake failed ***\n");
591
479
gnutls_perror (ret);
592
480
retval = -1;
593
goto mandos_end;
481
goto exit;
594
482
}
595
483
break;
596
484
default:
597
485
fprintf(stderr, "Unknown error while reading data from"
598
" encrypted session with Mandos server\n");
486
" encrypted session with mandos server\n");
599
487
retval = -1;
600
gnutls_bye (session, GNUTLS_SHUT_RDWR);
601
goto mandos_end;
488
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
489
goto exit;
602
490
}
603
491
} else {
604
492
buffer_length += (size_t) ret;
605
493
}
606
494
}
607
495
608
if(debug){
609
fprintf(stderr, "Closing TLS session\n");
610
}
611
612
gnutls_bye (session, GNUTLS_SHUT_RDWR);
613
614
496
if (buffer_length > 0){
615
497
decrypted_buffer_size = pgp_packet_decrypt(buffer,
616
498
buffer_length,
617
499
&decrypted_buffer,
618
keydir);
500
certdir);
619
501
if (decrypted_buffer_size >= 0){
620
written = 0;
621
502
while(written < (size_t) decrypted_buffer_size){
622
503
ret = (int)fwrite (decrypted_buffer + written, 1,
623
504
(size_t)decrypted_buffer_size - written,
637
518
retval = -1;
638
519
}
639
520
}
640
641
/* Shutdown procedure */
642
643
mandos_end:
521
522
//shutdown procedure
523
524
if(debug){
525
fprintf(stderr, "Closing TLS session\n");
526
}
527
644
528
free(buffer);
529
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
530
exit:
645
531
close(tcp_sd);
646
gnutls_deinit (session);
532
gnutls_deinit (es.session);
533
gnutls_certificate_free_credentials (es.cred);
534
gnutls_global_deinit ();
647
535
return retval;
648
536
}
649
537
650
static void resolve_callback(AvahiSServiceResolver *r,
651
AvahiIfIndex interface,
652
AVAHI_GCC_UNUSED AvahiProtocol protocol,
653
AvahiResolverEvent event,
654
const char *name,
655
const char *type,
656
const char *domain,
657
const char *host_name,
658
const AvahiAddress *address,
659
uint16_t port,
660
AVAHI_GCC_UNUSED AvahiStringList *txt,
661
AVAHI_GCC_UNUSED AvahiLookupResultFlags
662
flags,
663
void* userdata) {
538
static void resolve_callback( AvahiSServiceResolver *r,
539
AvahiIfIndex interface,
540
AVAHI_GCC_UNUSED AvahiProtocol protocol,
541
AvahiResolverEvent event,
542
const char *name,
543
const char *type,
544
const char *domain,
545
const char *host_name,
546
const AvahiAddress *address,
547
uint16_t port,
548
AVAHI_GCC_UNUSED AvahiStringList *txt,
549
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
550
AVAHI_GCC_UNUSED void* userdata) {
664
551
mandos_context *mc = userdata;
665
assert(r);
552
assert(r); /* Spurious warning */
666
553
667
554
/* Called whenever a service has been resolved successfully or
668
555
timed out */
670
557
switch (event) {
671
558
default:
672
559
case AVAHI_RESOLVER_FAILURE:
673
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
674
" of type '%s' in domain '%s': %s\n", name, type, domain,
560
fprintf(stderr, "(Resolver) Failed to resolve service '%s' of"
561
" type '%s' in domain '%s': %s\n", name, type, domain,
675
562
avahi_strerror(avahi_server_errno(mc->server)));
676
563
break;
677
564
680
567
char ip[AVAHI_ADDRESS_STR_MAX];
681
568
avahi_address_snprint(ip, sizeof(ip), address);
682
569
if(debug){
683
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
684
PRIu16 ") on port %d\n", name, host_name, ip,
685
interface, port);
570
fprintf(stderr, "Mandos server \"%s\" found on %s (%s) on"
571
" port %d\n", name, host_name, ip, port);
686
572
}
687
573
int ret = start_mandos_communication(ip, port, interface, mc);
688
574
if (ret == 0){
689
avahi_simple_poll_quit(mc->simple_poll);
575
exit(EXIT_SUCCESS);
690
576
}
691
577
}
692
578
}
700
586
const char *name,
701
587
const char *type,
702
588
const char *domain,
703
AVAHI_GCC_UNUSED AvahiLookupResultFlags
704
flags,
589
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
705
590
void* userdata) {
706
591
mandos_context *mc = userdata;
707
assert(b);
592
assert(b); /* Spurious warning */
708
593
709
594
/* Called whenever a new services becomes available on the LAN or
710
595
is removed from the LAN */
712
597
switch (event) {
713
598
default:
714
599
case AVAHI_BROWSER_FAILURE:
715
716
fprintf(stderr, "(Avahi browser) %s\n",
600
601
fprintf(stderr, "(Browser) %s\n",
717
602
avahi_strerror(avahi_server_errno(mc->server)));
718
603
avahi_simple_poll_quit(mc->simple_poll);
719
604
return;
720
605
721
606
case AVAHI_BROWSER_NEW:
722
/* We ignore the returned Avahi resolver object. In the callback
723
function we free it. If the Avahi server is terminated before
724
the callback function is called the Avahi server will free the
725
resolver for us. */
726
727
if (!(avahi_s_service_resolver_new(mc->server, interface,
728
protocol, name, type, domain,
607
/* We ignore the returned resolver object. In the callback
608
function we free it. If the server is terminated before
609
the callback function is called the server will free
610
the resolver for us. */
611
612
if (!(avahi_s_service_resolver_new(mc->server, interface, protocol, name,
613
type, domain,
729
614
AVAHI_PROTO_INET6, 0,
730
615
resolve_callback, mc)))
731
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
732
name, avahi_strerror(avahi_server_errno(mc->server)));
616
fprintf(stderr, "Failed to resolve service '%s': %s\n", name,
617
avahi_strerror(avahi_server_errno(s)));
733
618
break;
734
619
735
620
case AVAHI_BROWSER_REMOVE:
736
621
break;
737
622
738
623
case AVAHI_BROWSER_ALL_FOR_NOW:
739
624
case AVAHI_BROWSER_CACHE_EXHAUSTED:
740
if(debug){
741
fprintf(stderr, "No Mandos server found, still searching...\n");
742
}
743
625
break;
744
626
}
745
627
}
746
628
747
629
/* Combines file name and path and returns the malloced new
748
630
string. some sane checks could/should be added */
749
static char *combinepath(const char *first, const char *second){
750
char *tmp;
751
int ret = asprintf(&tmp, "%s/%s", first, second);
752
if(ret < 0){
631
static const char *combinepath(const char *first, const char *second){
632
size_t f_len = strlen(first);
633
size_t s_len = strlen(second);
634
char *tmp = malloc(f_len + s_len + 2);
635
if (tmp == NULL){
753
636
return NULL;
754
637
}
638
if(f_len > 0){
639
memcpy(tmp, first, f_len);
640
}
641
tmp[f_len] = '/';
642
if(s_len > 0){
643
memcpy(tmp + f_len + 1, second, s_len);
644
}
645
tmp[f_len + 1 + s_len] = '\0';
755
646
return tmp;
756
647
}
757
648
758
649
759
int main(int argc, char *argv[]){
650
int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
651
AvahiServerConfig config;
760
652
AvahiSServiceBrowser *sb = NULL;
761
653
int error;
762
654
int ret;
763
int exitcode = EXIT_SUCCESS;
655
int returncode = EXIT_SUCCESS;
764
656
const char *interface = "eth0";
765
657
struct ifreq network;
766
658
int sd;
767
uid_t uid;
768
gid_t gid;
769
659
char *connect_to = NULL;
770
660
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
771
char *pubkeyfilename = NULL;
772
char *seckeyfilename = NULL;
773
const char *pubkeyname = "pubkey.txt";
774
const char *seckeyname = "seckey.txt";
775
661
mandos_context mc = { .simple_poll = NULL, .server = NULL,
776
.dh_bits = 1024, .priority = "SECURE256"};
777
bool gnutls_initalized = false;
662
.dh_bits = 2048, .priority = "SECURE256"};
778
663
779
{
780
struct argp_option options[] = {
781
{ .name = "debug", .key = 128,
782
.doc = "Debug mode", .group = 3 },
783
{ .name = "connect", .key = 'c',
784
.arg = "IP",
785
.doc = "Connect directly to a sepcified mandos server",
786
.group = 1 },
787
{ .name = "interface", .key = 'i',
788
.arg = "INTERFACE",
789
.doc = "Interface that Avahi will conntect through",
790
.group = 1 },
791
{ .name = "keydir", .key = 'd',
792
.arg = "KEYDIR",
793
.doc = "Directory where the openpgp keyring is",
794
.group = 1 },
795
{ .name = "seckey", .key = 's',
796
.arg = "SECKEY",
797
.doc = "Secret openpgp key for gnutls authentication",
798
.group = 1 },
799
{ .name = "pubkey", .key = 'p',
800
.arg = "PUBKEY",
801
.doc = "Public openpgp key for gnutls authentication",
802
.group = 2 },
803
{ .name = "dh-bits", .key = 129,
804
.arg = "BITS",
805
.doc = "dh-bits to use in gnutls communication",
806
.group = 2 },
807
{ .name = "priority", .key = 130,
808
.arg = "PRIORITY",
809
.doc = "GNUTLS priority", .group = 1 },
810
{ .name = NULL }
811
};
812
813
814
error_t parse_opt (int key, char *arg,
815
struct argp_state *state) {
816
/* Get the INPUT argument from `argp_parse', which we know is
817
a pointer to our plugin list pointer. */
818
switch (key) {
819
case 128:
820
debug = true;
821
break;
822
case 'c':
823
connect_to = arg;
824
break;
825
case 'i':
826
interface = arg;
827
break;
828
case 'd':
829
keydir = arg;
830
break;
831
case 's':
832
seckeyname = arg;
833
break;
834
case 'p':
835
pubkeyname = arg;
836
break;
837
case 129:
664
while (true){
665
static struct option long_options[] = {
666
{"debug", no_argument, (int *)&debug, 1},
667
{"connect", required_argument, 0, 'C'},
668
{"interface", required_argument, 0, 'i'},
669
{"certdir", required_argument, 0, 'd'},
670
{"certkey", required_argument, 0, 'c'},
671
{"certfile", required_argument, 0, 'k'},
672
{"dh_bits", required_argument, 0, 'D'},
673
{"priority", required_argument, 0, 'p'},
674
{0, 0, 0, 0} };
675
676
int option_index = 0;
677
ret = getopt_long (argc, argv, "i:", long_options,
678
&option_index);
679
680
if (ret == -1){
681
break;
682
}
683
684
switch(ret){
685
case 0:
686
break;
687
case 'i':
688
interface = optarg;
689
break;
690
case 'C':
691
connect_to = optarg;
692
break;
693
case 'd':
694
certdir = optarg;
695
break;
696
case 'c':
697
certfile = optarg;
698
break;
699
case 'k':
700
certkey = optarg;
701
break;
702
case 'D':
703
{
704
long int tmp;
838
705
errno = 0;
839
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
840
if (errno){
706
tmp = strtol(optarg, NULL, 10);
707
if (errno == ERANGE){
841
708
perror("strtol");
842
709
exit(EXIT_FAILURE);
843
710
}
844
break;
845
case 130:
846
mc.priority = arg;
847
break;
848
case ARGP_KEY_ARG:
849
argp_usage (state);
850
case ARGP_KEY_END:
851
break;
852
default:
853
return ARGP_ERR_UNKNOWN;
854
}
855
return 0;
856
}
857
858
struct argp argp = { .options = options, .parser = parse_opt,
859
.args_doc = "",
860
.doc = "Mandos client -- Get and decrypt"
861
" passwords from mandos server" };
862
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
863
if (ret == ARGP_ERR_UNKNOWN){
864
fprintf(stderr, "Unknown error while parsing arguments\n");
865
exitcode = EXIT_FAILURE;
866
goto end;
867
}
868
}
869
870
pubkeyfilename = combinepath(keydir, pubkeyname);
871
if (pubkeyfilename == NULL){
872
perror("combinepath");
873
exitcode = EXIT_FAILURE;
874
goto end;
875
}
876
877
seckeyfilename = combinepath(keydir, seckeyname);
878
if (seckeyfilename == NULL){
879
perror("combinepath");
880
exitcode = EXIT_FAILURE;
881
goto end;
882
}
883
884
ret = init_gnutls_global(&mc, pubkeyfilename, seckeyfilename);
885
if (ret == -1){
886
fprintf(stderr, "init_gnutls_global failed\n");
887
exitcode = EXIT_FAILURE;
888
goto end;
889
} else {
890
gnutls_initalized = true;
891
}
892
893
/* If the interface is down, bring it up */
894
{
895
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
896
if(sd < 0) {
897
perror("socket");
898
exitcode = EXIT_FAILURE;
899
goto end;
900
}
901
strcpy(network.ifr_name, interface);
902
ret = ioctl(sd, SIOCGIFFLAGS, &network);
903
if(ret == -1){
904
perror("ioctl SIOCGIFFLAGS");
905
exitcode = EXIT_FAILURE;
906
goto end;
907
}
908
if((network.ifr_flags & IFF_UP) == 0){
909
network.ifr_flags |= IFF_UP;
910
ret = ioctl(sd, SIOCSIFFLAGS, &network);
911
if(ret == -1){
912
perror("ioctl SIOCSIFFLAGS");
913
exitcode = EXIT_FAILURE;
914
goto end;
915
}
916
}
917
close(sd);
918
}
919
920
uid = getuid();
921
gid = getgid();
922
923
ret = setuid(uid);
924
if (ret == -1){
925
perror("setuid");
926
}
927
928
setgid(gid);
929
if (ret == -1){
930
perror("setgid");
711
mc.dh_bits = tmp;
712
}
713
break;
714
case 'p':
715
mc.priority = optarg;
716
break;
717
default:
718
exit(EXIT_FAILURE);
719
}
720
}
721
722
certfile = combinepath(certdir, certfile);
723
if (certfile == NULL){
724
perror("combinepath");
725
returncode = EXIT_FAILURE;
726
goto exit;
727
}
728
729
certkey = combinepath(certdir, certkey);
730
if (certkey == NULL){
731
perror("combinepath");
732
returncode = EXIT_FAILURE;
733
goto exit;
931
734
}
932
735
933
736
if_index = (AvahiIfIndex) if_nametoindex(interface);
942
745
char *address = strrchr(connect_to, ':');
943
746
if(address == NULL){
944
747
fprintf(stderr, "No colon in address\n");
945
exitcode = EXIT_FAILURE;
946
goto end;
748
exit(EXIT_FAILURE);
947
749
}
948
750
errno = 0;
949
751
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
950
752
if(errno){
951
753
perror("Bad port number");
952
exitcode = EXIT_FAILURE;
953
goto end;
754
exit(EXIT_FAILURE);
954
755
}
955
756
*address = '\0';
956
757
address = connect_to;
957
ret = start_mandos_communication(address, port, if_index, &mc);
758
ret = start_mandos_communication(address, port, if_index);
958
759
if(ret < 0){
959
exitcode = EXIT_FAILURE;
760
exit(EXIT_FAILURE);
960
761
} else {
961
exitcode = EXIT_SUCCESS;
962
}
963
goto end;
964
}
762
exit(EXIT_SUCCESS);
763
}
764
}
765
766
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
767
if(sd < 0) {
768
perror("socket");
769
returncode = EXIT_FAILURE;
770
goto exit;
771
}
772
strcpy(network.ifr_name, interface);
773
ret = ioctl(sd, SIOCGIFFLAGS, &network);
774
if(ret == -1){
775
776
perror("ioctl SIOCGIFFLAGS");
777
returncode = EXIT_FAILURE;
778
goto exit;
779
}
780
if((network.ifr_flags & IFF_UP) == 0){
781
network.ifr_flags |= IFF_UP;
782
ret = ioctl(sd, SIOCSIFFLAGS, &network);
783
if(ret == -1){
784
perror("ioctl SIOCSIFFLAGS");
785
returncode = EXIT_FAILURE;
786
goto exit;
787
}
788
}
789
close(sd);
965
790
966
791
if (not debug){
967
792
avahi_set_log_function(empty_log);
968
793
}
969
794
970
/* Initialize the pseudo-RNG for Avahi */
795
/* Initialize the psuedo-RNG */
971
796
srand((unsigned int) time(NULL));
972
973
/* Allocate main Avahi loop object */
974
mc.simple_poll = avahi_simple_poll_new();
975
if (mc.simple_poll == NULL) {
976
fprintf(stderr, "Avahi: Failed to create simple poll"
977
" object.\n");
978
exitcode = EXIT_FAILURE;
979
goto end;
980
}
981
982
{
983
AvahiServerConfig config;
984
/* Do not publish any local Zeroconf records */
985
avahi_server_config_init(&config);
986
config.publish_hinfo = 0;
987
config.publish_addresses = 0;
988
config.publish_workstation = 0;
989
config.publish_domain = 0;
990
991
/* Allocate a new server */
992
mc.server = avahi_server_new(avahi_simple_poll_get
993
(mc.simple_poll), &config, NULL,
994
NULL, &error);
995
996
/* Free the Avahi configuration data */
997
avahi_server_config_free(&config);
998
}
999
1000
/* Check if creating the Avahi server object succeeded */
1001
if (mc.server == NULL) {
1002
fprintf(stderr, "Failed to create Avahi server: %s\n",
797
798
/* Allocate main loop object */
799
if (!(mc.simple_poll = avahi_simple_poll_new())) {
800
fprintf(stderr, "Failed to create simple poll object.\n");
801
returncode = EXIT_FAILURE;
802
goto exit;
803
}
804
805
/* Do not publish any local records */
806
avahi_server_config_init(&config);
807
config.publish_hinfo = 0;
808
config.publish_addresses = 0;
809
config.publish_workstation = 0;
810
config.publish_domain = 0;
811
812
/* Allocate a new server */
813
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
814
&config, NULL, NULL, &error);
815
816
/* Free the configuration data */
817
avahi_server_config_free(&config);
818
819
/* Check if creating the server object succeeded */
820
if (!mc.server) {
821
fprintf(stderr, "Failed to create server: %s\n",
1003
822
avahi_strerror(error));
1004
exitcode = EXIT_FAILURE;
1005
goto end;
823
returncode = EXIT_FAILURE;
824
goto exit;
1006
825
}
1007
826
1008
/* Create the Avahi service browser */
827
/* Create the service browser */
1009
828
sb = avahi_s_service_browser_new(mc.server, if_index,
1010
829
AVAHI_PROTO_INET6,
1011
830
"_mandos._tcp", NULL, 0,
1012
831
browse_callback, &mc);
1013
if (sb == NULL) {
832
if (!sb) {
1014
833
fprintf(stderr, "Failed to create service browser: %s\n",
1015
834
avahi_strerror(avahi_server_errno(mc.server)));
1016
exitcode = EXIT_FAILURE;
1017
goto end;
835
returncode = EXIT_FAILURE;
836
goto exit;
1018
837
}
1019
838
1020
839
/* Run the main loop */
1021
840
1022
841
if (debug){
1023
fprintf(stderr, "Starting Avahi loop search\n");
842
fprintf(stderr, "Starting avahi loop search\n");
1024
843
}
1025
844
1026
avahi_simple_poll_loop(mc.simple_poll);
845
avahi_simple_poll_loop(simple_poll);
1027
846
1028
end:
847
exit:
1029
848
1030
849
if (debug){
1031
850
fprintf(stderr, "%s exiting\n", argv[0]);
1032
851
}
1033
852
1034
853
/* Cleanup things */
1035
if (sb != NULL)
854
if (sb)
1036
855
avahi_s_service_browser_free(sb);
1037
856
1038
if (mc.server != NULL)
857
if (mc.server)
1039
858
avahi_server_free(mc.server);
1040
859
1041
if (mc.simple_poll != NULL)
1042
avahi_simple_poll_free(mc.simple_poll);
1043
free(pubkeyfilename);
1044
free(seckeyfilename);
1045
1046
if (gnutls_initalized){
1047
gnutls_certificate_free_credentials(mc.cred);
1048
gnutls_global_deinit ();
1049
}
860
if (simple_poll)
861
avahi_simple_poll_free(simple_poll);
862
free(certfile);
863
free(certkey);
1050
864
1051
return exitcode;
865
return returncode;
1052
866
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0