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- Committer: Teddy Hogeborn
- Date: 2008-08-03 01:09:36 UTC
- mfrom: (24.1.9 mandos)
- Revision ID: teddy@fukt.bsnet.se-20080803010936-ujme8tgxceszfbi1
* plugbasedclient.c (main): New "--userid" and "--groupid" options.
Take an additional non-option argument and
parse it as a plus-separated and -prefixed
list of additional options.
* plugins.d/mandosclient.c (DH_BITS): Replaced with
"mandos_context.dh_bits". All
users changed.
(certdir): Renamed to "keydir". All users changed.
(certfile): Renamed to "pubkeyfile". All users changed.
(certkey): Renamed to "seckeyfile". All users changed.
(encrypted_session): Replaced with "mandos_context". All users
changed.
(initgnutls): Take additional "session" and "dh_params" arguments.
All callers changed.
(start_mandos_communication): Take additional "mc" argument. All
callers changed. Print target IPv6
address if different than supplied
string.
(simple_poll) Replaced with "mandos_context.simple_poll". All users
changed.
(server): Replaced with "mandos_context.server". All users changed.
(main): Default interface to "eth0". Rename "--certdir" to
"--keydir", "--certkey" to "--seckey", and "--certfile" to
"--pubkey". New options "--dh-bits" and "--priority". If
the interface is not up, bring it up.
Take an additional non-option argument and
parse it as a plus-separated and -prefixed
list of additional options.
* plugins.d/mandosclient.c (DH_BITS): Replaced with
"mandos_context.dh_bits". All
users changed.
(certdir): Renamed to "keydir". All users changed.
(certfile): Renamed to "pubkeyfile". All users changed.
(certkey): Renamed to "seckeyfile". All users changed.
(encrypted_session): Replaced with "mandos_context". All users
changed.
(initgnutls): Take additional "session" and "dh_params" arguments.
All callers changed.
(start_mandos_communication): Take additional "mc" argument. All
callers changed. Print target IPv6
address if different than supplied
string.
(simple_poll) Replaced with "mandos_context.simple_poll". All users
changed.
(server): Replaced with "mandos_context.server". All users changed.
(main): Default interface to "eth0". Rename "--certdir" to
"--keydir", "--certkey" to "--seckey", and "--certfile" to
"--pubkey". New options "--dh-bits" and "--priority". If
the interface is not up, bring it up.
- files added:
- ca.pem
- files removed:
- initramfs-tools-hook
- files renamed:
- mandos-client.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() */
36
37
#include <stdio.h> /* fprintf(), stderr, fwrite(), stdout,
38
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(), memcpy(), 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 functions
85
gnutls_*
86
init_gnutls_session(),
87
GNUTLS_* */
88
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
89
GNUTLS_OPENPGP_FMT_BASE64 */
90
91
/* GPGME */
92
#include <gpgme.h> /* All GPGME types, constants and functions
93
gpgme_*
94
GPGME_PROTOCOL_OpenPGP,
95
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>
96
70
97
71
#define BUFFER_SIZE 256
98
72
73
static const char *keydir = "/conf/conf.d/mandos";
74
static const char *pubkeyfile = "pubkey.txt";
75
static const char *seckeyfile = "seckey.txt";
76
99
77
bool debug = false;
100
static const char *keydir = "/conf/conf.d/mandos";
101
static const char mandos_protocol_version[] = "1";
102
const char *argp_program_version = "password-request 1.0";
103
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
104
78
105
/* Used for passing in values through the Avahi callback functions */
79
/* Used for passing in values through all the callback functions */
106
80
typedef struct {
107
81
AvahiSimplePoll *simple_poll;
108
82
AvahiServer *server;
109
83
gnutls_certificate_credentials_t cred;
110
84
unsigned int dh_bits;
111
gnutls_dh_params_t dh_params;
112
85
const char *priority;
113
86
} mandos_context;
114
87
115
/*
116
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
117
* "buffer_capacity" is how much is currently allocated,
118
* "buffer_length" is how much is already used.
119
*/
120
size_t adjustbuffer(char **buffer, size_t buffer_length,
121
size_t buffer_capacity){
122
if (buffer_length + BUFFER_SIZE > buffer_capacity){
123
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
124
if (buffer == NULL){
125
return 0;
126
}
127
buffer_capacity += BUFFER_SIZE;
128
}
129
return buffer_capacity;
130
}
131
132
/*
133
* Decrypt OpenPGP data using keyrings in HOMEDIR.
134
* Returns -1 on error
135
*/
136
static ssize_t pgp_packet_decrypt (const char *cryptotext,
137
size_t crypto_size,
138
char **plaintext,
88
static ssize_t pgp_packet_decrypt (char *packet, size_t packet_size,
89
char **new_packet,
139
90
const char *homedir){
140
91
gpgme_data_t dh_crypto, dh_plain;
141
92
gpgme_ctx_t ctx;
142
93
gpgme_error_t rc;
143
94
ssize_t ret;
144
size_t plaintext_capacity = 0;
145
ssize_t plaintext_length = 0;
95
ssize_t new_packet_capacity = 0;
96
ssize_t new_packet_length = 0;
146
97
gpgme_engine_info_t engine_info;
147
98
148
99
if (debug){
149
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
100
fprintf(stderr, "Trying to decrypt OpenPGP packet\n");
150
101
}
151
102
152
103
/* Init GPGME */
158
109
return -1;
159
110
}
160
111
161
/* Set GPGME home directory for the OpenPGP engine only */
112
/* Set GPGME home directory */
162
113
rc = gpgme_get_engine_info (&engine_info);
163
114
if (rc != GPG_ERR_NO_ERROR){
164
115
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
174
125
engine_info = engine_info->next;
175
126
}
176
127
if(engine_info == NULL){
177
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
128
fprintf(stderr, "Could not set home dir to %s\n", homedir);
178
129
return -1;
179
130
}
180
131
181
/* Create new GPGME data buffer from memory cryptotext */
182
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
183
0);
132
/* Create new GPGME data buffer from packet buffer */
133
rc = gpgme_data_new_from_mem(&dh_crypto, packet, packet_size, 0);
184
134
if (rc != GPG_ERR_NO_ERROR){
185
135
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
186
136
gpgme_strsource(rc), gpgme_strerror(rc));
192
142
if (rc != GPG_ERR_NO_ERROR){
193
143
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
194
144
gpgme_strsource(rc), gpgme_strerror(rc));
195
gpgme_data_release(dh_crypto);
196
145
return -1;
197
146
}
198
147
201
150
if (rc != GPG_ERR_NO_ERROR){
202
151
fprintf(stderr, "bad gpgme_new: %s: %s\n",
203
152
gpgme_strsource(rc), gpgme_strerror(rc));
204
plaintext_length = -1;
205
goto decrypt_end;
153
return -1;
206
154
}
207
155
208
/* Decrypt data from the cryptotext data buffer to the plaintext
209
data buffer */
156
/* Decrypt data from the FILE pointer to the plaintext data
157
buffer */
210
158
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
211
159
if (rc != GPG_ERR_NO_ERROR){
212
160
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
213
161
gpgme_strsource(rc), gpgme_strerror(rc));
214
plaintext_length = -1;
215
goto decrypt_end;
162
return -1;
216
163
}
217
164
218
165
if(debug){
219
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
166
fprintf(stderr, "Decryption of OpenPGP packet succeeded\n");
220
167
}
221
168
222
169
if (debug){
223
170
gpgme_decrypt_result_t result;
224
171
result = gpgme_op_decrypt_result(ctx);
227
174
} else {
228
175
fprintf(stderr, "Unsupported algorithm: %s\n",
229
176
result->unsupported_algorithm);
230
fprintf(stderr, "Wrong key usage: %u\n",
177
fprintf(stderr, "Wrong key usage: %d\n",
231
178
result->wrong_key_usage);
232
179
if(result->file_name != NULL){
233
180
fprintf(stderr, "File name: %s\n", result->file_name);
248
195
}
249
196
}
250
197
198
/* Delete the GPGME FILE pointer cryptotext data buffer */
199
gpgme_data_release(dh_crypto);
200
251
201
/* Seek back to the beginning of the GPGME plaintext data buffer */
252
202
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
253
203
perror("pgpme_data_seek");
254
plaintext_length = -1;
255
goto decrypt_end;
256
204
}
257
205
258
*plaintext = NULL;
206
*new_packet = 0;
259
207
while(true){
260
plaintext_capacity = adjustbuffer(plaintext,
261
(size_t)plaintext_length,
262
plaintext_capacity);
263
if (plaintext_capacity == 0){
264
perror("adjustbuffer");
265
plaintext_length = -1;
266
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;
267
217
}
268
218
269
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
219
ret = gpgme_data_read(dh_plain, *new_packet + new_packet_length,
270
220
BUFFER_SIZE);
271
221
/* Print the data, if any */
272
222
if (ret == 0){
273
/* EOF */
274
223
break;
275
224
}
276
225
if(ret < 0){
277
226
perror("gpgme_data_read");
278
plaintext_length = -1;
279
goto decrypt_end;
227
return -1;
280
228
}
281
plaintext_length += ret;
229
new_packet_length += ret;
282
230
}
283
231
284
if(debug){
285
fprintf(stderr, "Decrypted password is: ");
286
for(ssize_t i = 0; i < plaintext_length; i++){
287
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
288
}
289
fprintf(stderr, "\n");
290
}
291
292
decrypt_end:
293
294
/* Delete the GPGME cryptotext data buffer */
295
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
/* } */
296
239
297
240
/* Delete the GPGME plaintext data buffer */
298
241
gpgme_data_release(dh_plain);
299
return plaintext_length;
242
return new_packet_length;
300
243
}
301
244
302
245
static const char * safer_gnutls_strerror (int value) {
306
249
return ret;
307
250
}
308
251
309
/* GnuTLS log function callback */
310
252
static void debuggnutls(__attribute__((unused)) int level,
311
253
const char* string){
312
fprintf(stderr, "GnuTLS: %s", string);
254
fprintf(stderr, "%s", string);
313
255
}
314
256
315
static int init_gnutls_global(mandos_context *mc,
316
const char *pubkeyfile,
317
const char *seckeyfile){
257
static int initgnutls(mandos_context *mc, gnutls_session_t *session,
258
gnutls_dh_params_t *dh_params){
259
const char *err;
318
260
int ret;
319
261
320
262
if(debug){
321
263
fprintf(stderr, "Initializing GnuTLS\n");
322
264
}
323
324
ret = gnutls_global_init();
325
if (ret != GNUTLS_E_SUCCESS) {
326
fprintf (stderr, "GnuTLS global_init: %s\n",
327
safer_gnutls_strerror(ret));
265
266
if ((ret = gnutls_global_init ())
267
!= GNUTLS_E_SUCCESS) {
268
fprintf (stderr, "global_init: %s\n", safer_gnutls_strerror(ret));
328
269
return -1;
329
270
}
330
271
331
272
if (debug){
332
/* "Use a log level over 10 to enable all debugging options."
333
* - GnuTLS manual
334
*/
335
273
gnutls_global_set_log_level(11);
336
274
gnutls_global_set_log_function(debuggnutls);
337
275
}
338
276
339
/* OpenPGP credentials */
340
gnutls_certificate_allocate_credentials(&mc->cred);
341
if (ret != GNUTLS_E_SUCCESS){
342
fprintf (stderr, "GnuTLS memory error: %s\n",
277
/* openpgp credentials */
278
if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))
279
!= GNUTLS_E_SUCCESS) {
280
fprintf (stderr, "memory error: %s\n",
343
281
safer_gnutls_strerror(ret));
344
gnutls_global_deinit ();
345
282
return -1;
346
283
}
347
284
354
291
ret = gnutls_certificate_set_openpgp_key_file
355
292
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
356
293
if (ret != GNUTLS_E_SUCCESS) {
357
fprintf(stderr,
358
"Error[%d] while reading the OpenPGP key pair ('%s',"
359
" '%s')\n", ret, pubkeyfile, seckeyfile);
360
fprintf(stdout, "The GnuTLS error is: %s\n",
294
fprintf
295
(stderr, "Error[%d] while reading the OpenPGP key pair ('%s',"
296
" '%s')\n",
297
ret, pubkeyfile, seckeyfile);
298
fprintf(stdout, "The Error is: %s\n",
361
299
safer_gnutls_strerror(ret));
362
goto globalfail;
363
}
364
365
/* GnuTLS server initialization */
366
ret = gnutls_dh_params_init(&mc->dh_params);
367
if (ret != GNUTLS_E_SUCCESS) {
368
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
369
" %s\n", safer_gnutls_strerror(ret));
370
goto globalfail;
371
}
372
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
373
if (ret != GNUTLS_E_SUCCESS) {
374
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
375
safer_gnutls_strerror(ret));
376
goto globalfail;
377
}
378
379
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
380
381
return 0;
382
383
globalfail:
384
385
gnutls_certificate_free_credentials(mc->cred);
386
gnutls_global_deinit();
387
return -1;
388
389
}
390
391
static int init_gnutls_session(mandos_context *mc,
392
gnutls_session_t *session){
393
int ret;
394
/* GnuTLS session creation */
395
ret = gnutls_init(session, GNUTLS_SERVER);
396
if (ret != GNUTLS_E_SUCCESS){
300
return -1;
301
}
302
303
//GnuTLS server initialization
304
if ((ret = gnutls_dh_params_init(dh_params))
305
!= GNUTLS_E_SUCCESS) {
306
fprintf (stderr, "Error in dh parameter initialization: %s\n",
307
safer_gnutls_strerror(ret));
308
return -1;
309
}
310
311
if ((ret = gnutls_dh_params_generate2(*dh_params, mc->dh_bits))
312
!= GNUTLS_E_SUCCESS) {
313
fprintf (stderr, "Error in prime generation: %s\n",
314
safer_gnutls_strerror(ret));
315
return -1;
316
}
317
318
gnutls_certificate_set_dh_params(mc->cred, *dh_params);
319
320
// GnuTLS session creation
321
if ((ret = gnutls_init(session, GNUTLS_SERVER))
322
!= GNUTLS_E_SUCCESS){
397
323
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
398
324
safer_gnutls_strerror(ret));
399
325
}
400
326
401
{
402
const char *err;
403
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
404
if (ret != GNUTLS_E_SUCCESS) {
405
fprintf(stderr, "Syntax error at: %s\n", err);
406
fprintf(stderr, "GnuTLS error: %s\n",
407
safer_gnutls_strerror(ret));
408
gnutls_deinit (*session);
409
return -1;
410
}
327
if ((ret = gnutls_priority_set_direct(*session, mc->priority, &err))
328
!= GNUTLS_E_SUCCESS) {
329
fprintf(stderr, "Syntax error at: %s\n", err);
330
fprintf(stderr, "GnuTLS error: %s\n",
331
safer_gnutls_strerror(ret));
332
return -1;
411
333
}
412
334
413
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
414
mc->cred);
415
if (ret != GNUTLS_E_SUCCESS) {
416
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
335
if ((ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
336
mc->cred))
337
!= GNUTLS_E_SUCCESS) {
338
fprintf(stderr, "Error setting a credentials set: %s\n",
417
339
safer_gnutls_strerror(ret));
418
gnutls_deinit (*session);
419
340
return -1;
420
341
}
421
342
428
349
return 0;
429
350
}
430
351
431
/* Avahi log function callback */
432
352
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
433
353
__attribute__((unused)) const char *txt){}
434
354
435
/* Called when a Mandos server is found */
436
355
static int start_mandos_communication(const char *ip, uint16_t port,
437
356
AvahiIfIndex if_index,
438
357
mandos_context *mc){
439
358
int ret, tcp_sd;
440
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
359
struct sockaddr_in6 to;
441
360
char *buffer = NULL;
442
361
char *decrypted_buffer;
443
362
size_t buffer_length = 0;
444
363
size_t buffer_capacity = 0;
445
364
ssize_t decrypted_buffer_size;
446
size_t written;
365
size_t written = 0;
447
366
int retval = 0;
448
367
char interface[IF_NAMESIZE];
449
368
gnutls_session_t session;
450
451
ret = init_gnutls_session (mc, &session);
452
if (ret != 0){
453
return -1;
454
}
369
gnutls_dh_params_t dh_params;
455
370
456
371
if(debug){
457
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
458
"\n", ip, port);
372
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
373
ip, port);
459
374
}
460
375
461
376
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
473
388
}
474
389
475
390
memset(&to,0,sizeof(to)); /* Spurious warning */
476
to.in6.sin6_family = AF_INET6;
477
/* It would be nice to have a way to detect if we were passed an
478
IPv4 address here. Now we assume an IPv6 address. */
479
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
391
to.sin6_family = AF_INET6;
392
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
480
393
if (ret < 0 ){
481
394
perror("inet_pton");
482
395
return -1;
485
398
fprintf(stderr, "Bad address: %s\n", ip);
486
399
return -1;
487
400
}
488
to.in6.sin6_port = htons(port); /* Spurious warning */
401
to.sin6_port = htons(port); /* Spurious warning */
489
402
490
to.in6.sin6_scope_id = (uint32_t)if_index;
403
to.sin6_scope_id = (uint32_t)if_index;
491
404
492
405
if(debug){
493
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
494
port);
406
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
495
407
char addrstr[INET6_ADDRSTRLEN] = "";
496
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
408
if(inet_ntop(to.sin6_family, &(to.sin6_addr), addrstr,
497
409
sizeof(addrstr)) == NULL){
498
410
perror("inet_ntop");
499
411
} else {
503
415
}
504
416
}
505
417
506
ret = connect(tcp_sd, &to.in, sizeof(to));
418
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
507
419
if (ret < 0){
508
420
perror("connect");
509
421
return -1;
510
422
}
511
512
const char *out = mandos_protocol_version;
513
written = 0;
514
while (true){
515
size_t out_size = strlen(out);
516
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
517
out_size - written));
518
if (ret == -1){
519
perror("write");
520
retval = -1;
521
goto mandos_end;
522
}
523
written += (size_t)ret;
524
if(written < out_size){
525
continue;
526
} else {
527
if (out == mandos_protocol_version){
528
written = 0;
529
out = "\r\n";
530
} else {
531
break;
532
}
533
}
423
424
ret = initgnutls (mc, &session, &dh_params);
425
if (ret != 0){
426
retval = -1;
427
return -1;
534
428
}
535
429
430
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
431
536
432
if(debug){
537
433
fprintf(stderr, "Establishing TLS session with %s\n", ip);
538
434
}
539
435
540
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
541
542
do{
543
ret = gnutls_handshake (session);
544
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
436
ret = gnutls_handshake (session);
545
437
546
438
if (ret != GNUTLS_E_SUCCESS){
547
439
if(debug){
548
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
440
fprintf(stderr, "\n*** Handshake failed ***\n");
549
441
gnutls_perror (ret);
550
442
}
551
443
retval = -1;
552
goto mandos_end;
444
goto exit;
553
445
}
554
446
555
/* Read OpenPGP packet that contains the wanted password */
447
//Retrieve OpenPGP packet that contains the wanted password
556
448
557
449
if(debug){
558
450
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
560
452
}
561
453
562
454
while(true){
563
buffer_capacity = adjustbuffer(&buffer, buffer_length,
564
buffer_capacity);
565
if (buffer_capacity == 0){
566
perror("adjustbuffer");
567
retval = -1;
568
goto mandos_end;
455
if (buffer_length + BUFFER_SIZE > buffer_capacity){
456
buffer = realloc(buffer, buffer_capacity + BUFFER_SIZE);
457
if (buffer == NULL){
458
perror("realloc");
459
goto exit;
460
}
461
buffer_capacity += BUFFER_SIZE;
569
462
}
570
463
571
464
ret = gnutls_record_recv(session, buffer+buffer_length,
579
472
case GNUTLS_E_AGAIN:
580
473
break;
581
474
case GNUTLS_E_REHANDSHAKE:
582
do{
583
ret = gnutls_handshake (session);
584
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
475
ret = gnutls_handshake (session);
585
476
if (ret < 0){
586
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
477
fprintf(stderr, "\n*** Handshake failed ***\n");
587
478
gnutls_perror (ret);
588
479
retval = -1;
589
goto mandos_end;
480
goto exit;
590
481
}
591
482
break;
592
483
default:
593
484
fprintf(stderr, "Unknown error while reading data from"
594
" encrypted session with Mandos server\n");
485
" encrypted session with mandos server\n");
595
486
retval = -1;
596
487
gnutls_bye (session, GNUTLS_SHUT_RDWR);
597
goto mandos_end;
488
goto exit;
598
489
}
599
490
} else {
600
491
buffer_length += (size_t) ret;
601
492
}
602
493
}
603
494
604
if(debug){
605
fprintf(stderr, "Closing TLS session\n");
606
}
607
608
gnutls_bye (session, GNUTLS_SHUT_RDWR);
609
610
495
if (buffer_length > 0){
611
496
decrypted_buffer_size = pgp_packet_decrypt(buffer,
612
497
buffer_length,
613
498
&decrypted_buffer,
614
499
keydir);
615
500
if (decrypted_buffer_size >= 0){
616
written = 0;
617
501
while(written < (size_t) decrypted_buffer_size){
618
502
ret = (int)fwrite (decrypted_buffer + written, 1,
619
503
(size_t)decrypted_buffer_size - written,
633
517
retval = -1;
634
518
}
635
519
}
636
637
/* Shutdown procedure */
638
639
mandos_end:
520
521
//shutdown procedure
522
523
if(debug){
524
fprintf(stderr, "Closing TLS session\n");
525
}
526
640
527
free(buffer);
528
gnutls_bye (session, GNUTLS_SHUT_RDWR);
529
exit:
641
530
close(tcp_sd);
642
531
gnutls_deinit (session);
532
gnutls_certificate_free_credentials (mc->cred);
533
gnutls_global_deinit ();
643
534
return retval;
644
535
}
645
536
646
static void resolve_callback(AvahiSServiceResolver *r,
647
AvahiIfIndex interface,
648
AVAHI_GCC_UNUSED AvahiProtocol protocol,
649
AvahiResolverEvent event,
650
const char *name,
651
const char *type,
652
const char *domain,
653
const char *host_name,
654
const AvahiAddress *address,
655
uint16_t port,
656
AVAHI_GCC_UNUSED AvahiStringList *txt,
657
AVAHI_GCC_UNUSED AvahiLookupResultFlags
658
flags,
659
void* userdata) {
537
static void resolve_callback( AvahiSServiceResolver *r,
538
AvahiIfIndex interface,
539
AVAHI_GCC_UNUSED AvahiProtocol protocol,
540
AvahiResolverEvent event,
541
const char *name,
542
const char *type,
543
const char *domain,
544
const char *host_name,
545
const AvahiAddress *address,
546
uint16_t port,
547
AVAHI_GCC_UNUSED AvahiStringList *txt,
548
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
549
void* userdata) {
660
550
mandos_context *mc = userdata;
661
551
assert(r); /* Spurious warning */
662
552
666
556
switch (event) {
667
557
default:
668
558
case AVAHI_RESOLVER_FAILURE:
669
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
670
" of type '%s' in domain '%s': %s\n", name, type, domain,
559
fprintf(stderr, "(Resolver) Failed to resolve service '%s' of"
560
" type '%s' in domain '%s': %s\n", name, type, domain,
671
561
avahi_strerror(avahi_server_errno(mc->server)));
672
562
break;
673
563
676
566
char ip[AVAHI_ADDRESS_STR_MAX];
677
567
avahi_address_snprint(ip, sizeof(ip), address);
678
568
if(debug){
679
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
680
PRIu16 ") on port %d\n", name, host_name, ip,
681
interface, port);
569
fprintf(stderr, "Mandos server \"%s\" found on %s (%s) on"
570
" port %d\n", name, host_name, ip, port);
682
571
}
683
572
int ret = start_mandos_communication(ip, port, interface, mc);
684
573
if (ret == 0){
696
585
const char *name,
697
586
const char *type,
698
587
const char *domain,
699
AVAHI_GCC_UNUSED AvahiLookupResultFlags
700
flags,
588
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
701
589
void* userdata) {
702
590
mandos_context *mc = userdata;
703
591
assert(b); /* Spurious warning */
709
597
default:
710
598
case AVAHI_BROWSER_FAILURE:
711
599
712
fprintf(stderr, "(Avahi browser) %s\n",
600
fprintf(stderr, "(Browser) %s\n",
713
601
avahi_strerror(avahi_server_errno(mc->server)));
714
602
avahi_simple_poll_quit(mc->simple_poll);
715
603
return;
716
604
717
605
case AVAHI_BROWSER_NEW:
718
/* We ignore the returned Avahi resolver object. In the callback
719
function we free it. If the Avahi server is terminated before
720
the callback function is called the Avahi server will free the
721
resolver for us. */
606
/* We ignore the returned resolver object. In the callback
607
function we free it. If the server is terminated before
608
the callback function is called the server will free
609
the resolver for us. */
722
610
723
if (!(avahi_s_service_resolver_new(mc->server, interface,
724
protocol, name, type, domain,
611
if (!(avahi_s_service_resolver_new(mc->server, interface, protocol, name,
612
type, domain,
725
613
AVAHI_PROTO_INET6, 0,
726
614
resolve_callback, mc)))
727
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
728
name, avahi_strerror(avahi_server_errno(mc->server)));
615
fprintf(stderr, "Failed to resolve service '%s': %s\n", name,
616
avahi_strerror(avahi_server_errno(mc->server)));
729
617
break;
730
618
731
619
case AVAHI_BROWSER_REMOVE:
733
621
734
622
case AVAHI_BROWSER_ALL_FOR_NOW:
735
623
case AVAHI_BROWSER_CACHE_EXHAUSTED:
736
if(debug){
737
fprintf(stderr, "No Mandos server found, still searching...\n");
738
}
739
624
break;
740
625
}
741
626
}
761
646
}
762
647
763
648
764
int main(int argc, char *argv[]){
649
int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
650
AvahiServerConfig config;
765
651
AvahiSServiceBrowser *sb = NULL;
766
652
int error;
767
653
int ret;
768
int exitcode = EXIT_SUCCESS;
654
int debug_int;
655
int returncode = EXIT_SUCCESS;
769
656
const char *interface = "eth0";
770
657
struct ifreq network;
771
658
int sd;
772
uid_t uid;
773
gid_t gid;
774
659
char *connect_to = NULL;
775
660
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
776
const char *pubkeyfile = "pubkey.txt";
777
const char *seckeyfile = "seckey.txt";
778
661
mandos_context mc = { .simple_poll = NULL, .server = NULL,
779
662
.dh_bits = 1024, .priority = "SECURE256"};
780
bool gnutls_initalized = false;
781
663
782
{
783
struct argp_option options[] = {
784
{ .name = "debug", .key = 128,
785
.doc = "Debug mode", .group = 3 },
786
{ .name = "connect", .key = 'c',
787
.arg = "IP",
788
.doc = "Connect directly to a sepcified mandos server",
789
.group = 1 },
790
{ .name = "interface", .key = 'i',
791
.arg = "INTERFACE",
792
.doc = "Interface that Avahi will conntect through",
793
.group = 1 },
794
{ .name = "keydir", .key = 'd',
795
.arg = "KEYDIR",
796
.doc = "Directory where the openpgp keyring is",
797
.group = 1 },
798
{ .name = "seckey", .key = 's',
799
.arg = "SECKEY",
800
.doc = "Secret openpgp key for gnutls authentication",
801
.group = 1 },
802
{ .name = "pubkey", .key = 'p',
803
.arg = "PUBKEY",
804
.doc = "Public openpgp key for gnutls authentication",
805
.group = 2 },
806
{ .name = "dh-bits", .key = 129,
807
.arg = "BITS",
808
.doc = "dh-bits to use in gnutls communication",
809
.group = 2 },
810
{ .name = "priority", .key = 130,
811
.arg = "PRIORITY",
812
.doc = "GNUTLS priority", .group = 1 },
813
{ .name = NULL }
814
};
815
816
817
error_t parse_opt (int key, char *arg,
818
struct argp_state *state) {
819
/* Get the INPUT argument from `argp_parse', which we know is
820
a pointer to our plugin list pointer. */
821
switch (key) {
822
case 128:
823
debug = true;
824
break;
825
case 'c':
826
connect_to = arg;
827
break;
828
case 'i':
829
interface = arg;
830
break;
831
case 'd':
832
keydir = arg;
833
break;
834
case 's':
835
seckeyfile = arg;
836
break;
837
case 'p':
838
pubkeyfile = arg;
839
break;
840
case 129:
841
errno = 0;
842
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
843
if (errno){
844
perror("strtol");
845
exit(EXIT_FAILURE);
846
}
847
break;
848
case 130:
849
mc.priority = arg;
850
break;
851
case ARGP_KEY_ARG:
852
argp_usage (state);
853
break;
854
case ARGP_KEY_END:
855
break;
856
default:
857
return ARGP_ERR_UNKNOWN;
664
debug_int = debug ? 1 : 0;
665
while (true){
666
struct option long_options[] = {
667
{"debug", no_argument, &debug_int, 1},
668
{"connect", required_argument, NULL, 'c'},
669
{"interface", required_argument, NULL, 'i'},
670
{"keydir", required_argument, NULL, 'd'},
671
{"seckey", required_argument, NULL, 's'},
672
{"pubkey", required_argument, NULL, 'p'},
673
{"dh-bits", required_argument, NULL, 'D'},
674
{"priority", required_argument, NULL, 'P'},
675
{0, 0, 0, 0} };
676
677
int option_index = 0;
678
ret = getopt_long (argc, argv, "i:", long_options,
679
&option_index);
680
681
if (ret == -1){
682
break;
683
}
684
685
switch(ret){
686
case 0:
687
break;
688
case 'i':
689
interface = optarg;
690
break;
691
case 'c':
692
connect_to = optarg;
693
break;
694
case 'd':
695
keydir = optarg;
696
break;
697
case 'p':
698
pubkeyfile = optarg;
699
break;
700
case 's':
701
seckeyfile = optarg;
702
break;
703
case 'D':
704
errno = 0;
705
mc.dh_bits = (unsigned int) strtol(optarg, NULL, 10);
706
if (errno){
707
perror("strtol");
708
exit(EXIT_FAILURE);
858
709
}
859
return 0;
860
}
861
862
struct argp argp = { .options = options, .parser = parse_opt,
863
.args_doc = "",
864
.doc = "Mandos client -- Get and decrypt"
865
" passwords from mandos server" };
866
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
867
if (ret == ARGP_ERR_UNKNOWN){
868
fprintf(stderr, "Unknown error while parsing arguments\n");
869
exitcode = EXIT_FAILURE;
870
goto end;
710
break;
711
case 'P':
712
mc.priority = optarg;
713
break;
714
case '?':
715
default:
716
exit(EXIT_FAILURE);
871
717
}
872
718
}
873
719
debug = debug_int ? true : false;
720
874
721
pubkeyfile = combinepath(keydir, pubkeyfile);
875
722
if (pubkeyfile == NULL){
876
723
perror("combinepath");
877
exitcode = EXIT_FAILURE;
878
goto end;
724
returncode = EXIT_FAILURE;
725
goto exit;
879
726
}
880
727
881
728
seckeyfile = combinepath(keydir, seckeyfile);
882
729
if (seckeyfile == NULL){
883
730
perror("combinepath");
884
exitcode = EXIT_FAILURE;
885
goto end;
886
}
887
888
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
889
if (ret == -1){
890
fprintf(stderr, "init_gnutls_global failed\n");
891
exitcode = EXIT_FAILURE;
892
goto end;
893
} else {
894
gnutls_initalized = true;
895
}
896
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);
922
}
923
924
uid = getuid();
925
gid = getgid();
926
927
ret = setuid(uid);
928
if (ret == -1){
929
perror("setuid");
930
}
931
932
setgid(gid);
933
if (ret == -1){
934
perror("setgid");
731
goto exit;
935
732
}
936
733
937
734
if_index = (AvahiIfIndex) if_nametoindex(interface);
946
743
char *address = strrchr(connect_to, ':');
947
744
if(address == NULL){
948
745
fprintf(stderr, "No colon in address\n");
949
exitcode = EXIT_FAILURE;
950
goto end;
746
exit(EXIT_FAILURE);
951
747
}
952
748
errno = 0;
953
749
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
954
750
if(errno){
955
751
perror("Bad port number");
956
exitcode = EXIT_FAILURE;
957
goto end;
752
exit(EXIT_FAILURE);
958
753
}
959
754
*address = '\0';
960
755
address = connect_to;
961
756
ret = start_mandos_communication(address, port, if_index, &mc);
962
757
if(ret < 0){
963
exitcode = EXIT_FAILURE;
758
exit(EXIT_FAILURE);
964
759
} else {
965
exitcode = EXIT_SUCCESS;
966
}
967
goto end;
968
}
760
exit(EXIT_SUCCESS);
761
}
762
}
763
764
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
765
if(sd < 0) {
766
perror("socket");
767
returncode = EXIT_FAILURE;
768
goto exit;
769
}
770
strcpy(network.ifr_name, interface); /* Spurious warning */
771
ret = ioctl(sd, SIOCGIFFLAGS, &network);
772
if(ret == -1){
773
774
perror("ioctl SIOCGIFFLAGS");
775
returncode = EXIT_FAILURE;
776
goto exit;
777
}
778
if((network.ifr_flags & IFF_UP) == 0){
779
network.ifr_flags |= IFF_UP;
780
ret = ioctl(sd, SIOCSIFFLAGS, &network);
781
if(ret == -1){
782
perror("ioctl SIOCSIFFLAGS");
783
returncode = EXIT_FAILURE;
784
goto exit;
785
}
786
}
787
close(sd);
969
788
970
789
if (not debug){
971
790
avahi_set_log_function(empty_log);
972
791
}
973
792
974
/* Initialize the pseudo-RNG for Avahi */
793
/* Initialize the psuedo-RNG */
975
794
srand((unsigned int) time(NULL));
976
977
/* Allocate main Avahi loop object */
978
mc.simple_poll = avahi_simple_poll_new();
979
if (mc.simple_poll == NULL) {
980
fprintf(stderr, "Avahi: Failed to create simple poll"
981
" object.\n");
982
exitcode = EXIT_FAILURE;
983
goto end;
984
}
985
986
{
987
AvahiServerConfig config;
988
/* Do not publish any local Zeroconf records */
989
avahi_server_config_init(&config);
990
config.publish_hinfo = 0;
991
config.publish_addresses = 0;
992
config.publish_workstation = 0;
993
config.publish_domain = 0;
994
995
/* Allocate a new server */
996
mc.server = avahi_server_new(avahi_simple_poll_get
997
(mc.simple_poll), &config, NULL,
998
NULL, &error);
999
1000
/* Free the Avahi configuration data */
1001
avahi_server_config_free(&config);
1002
}
1003
1004
/* Check if creating the Avahi server object succeeded */
1005
if (mc.server == NULL) {
1006
fprintf(stderr, "Failed to create Avahi server: %s\n",
795
796
/* Allocate main loop object */
797
if (!(mc.simple_poll = avahi_simple_poll_new())) {
798
fprintf(stderr, "Failed to create simple poll object.\n");
799
returncode = EXIT_FAILURE;
800
goto exit;
801
}
802
803
/* Do not publish any local records */
804
avahi_server_config_init(&config);
805
config.publish_hinfo = 0;
806
config.publish_addresses = 0;
807
config.publish_workstation = 0;
808
config.publish_domain = 0;
809
810
/* Allocate a new server */
811
mc.server=avahi_server_new(avahi_simple_poll_get(mc.simple_poll),
812
&config, NULL, NULL, &error);
813
814
/* Free the configuration data */
815
avahi_server_config_free(&config);
816
817
/* Check if creating the server object succeeded */
818
if (!mc.server) {
819
fprintf(stderr, "Failed to create server: %s\n",
1007
820
avahi_strerror(error));
1008
exitcode = EXIT_FAILURE;
1009
goto end;
821
returncode = EXIT_FAILURE;
822
goto exit;
1010
823
}
1011
824
1012
/* Create the Avahi service browser */
825
/* Create the service browser */
1013
826
sb = avahi_s_service_browser_new(mc.server, if_index,
1014
827
AVAHI_PROTO_INET6,
1015
828
"_mandos._tcp", NULL, 0,
1016
829
browse_callback, &mc);
1017
if (sb == NULL) {
830
if (!sb) {
1018
831
fprintf(stderr, "Failed to create service browser: %s\n",
1019
832
avahi_strerror(avahi_server_errno(mc.server)));
1020
exitcode = EXIT_FAILURE;
1021
goto end;
833
returncode = EXIT_FAILURE;
834
goto exit;
1022
835
}
1023
836
1024
837
/* Run the main loop */
1025
838
1026
839
if (debug){
1027
fprintf(stderr, "Starting Avahi loop search\n");
840
fprintf(stderr, "Starting avahi loop search\n");
1028
841
}
1029
842
1030
843
avahi_simple_poll_loop(mc.simple_poll);
1031
844
1032
end:
845
exit:
1033
846
1034
847
if (debug){
1035
848
fprintf(stderr, "%s exiting\n", argv[0]);
1036
849
}
1037
850
1038
851
/* Cleanup things */
1039
if (sb != NULL)
852
if (sb)
1040
853
avahi_s_service_browser_free(sb);
1041
854
1042
if (mc.server != NULL)
855
if (mc.server)
1043
856
avahi_server_free(mc.server);
1044
857
1045
if (mc.simple_poll != NULL)
858
if (mc.simple_poll)
1046
859
avahi_simple_poll_free(mc.simple_poll);
1047
860
free(pubkeyfile);
1048
861
free(seckeyfile);
1049
1050
if (gnutls_initalized){
1051
gnutls_certificate_free_credentials(mc.cred);
1052
gnutls_global_deinit ();
1053
}
1054
862
1055
return exitcode;
863
return returncode;
1056
864
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0