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- Committer: Teddy Hogeborn
- Date: 2008-09-05 23:39:07 UTC
- Revision ID: teddy@fukt.bsnet.se-20080905233907-3rz7kuwyjwma0pjx
* Makefile (confdir/clients.conf): Tighten permissions to "u=rw".
(install-server): Set mode of "/etc/mandos/clients.conf" to
"u=rw".
(install-client): Set mode of "/etc/mandos/plugins.d" to "u=rwx".
(uninstall-client): Also remove "/usr/lib/mandos/plugins.d/usplash",
"/usr/share/initramfs-tools/scripts/local-top/mandos",
and "/etc/keys/mandos".
(purge-server): Also remove "/var/run/mandos.pid".
* initramfs-tools-hook: Use "install" instead of "mkdir". Change
owner of "/lib/mandos/plugins.d" and key
files. Bug fix: do not repair permissions of
"/lib/mandos/plugins.d". Bug fix: Really
avoid deliberately unreadable files and/or
directories.
* mandos-keygen (umask): Changed to "077".
(install-server): Set mode of "/etc/mandos/clients.conf" to
"u=rw".
(install-client): Set mode of "/etc/mandos/plugins.d" to "u=rwx".
(uninstall-client): Also remove "/usr/lib/mandos/plugins.d/usplash",
"/usr/share/initramfs-tools/scripts/local-top/mandos",
and "/etc/keys/mandos".
(purge-server): Also remove "/var/run/mandos.pid".
* initramfs-tools-hook: Use "install" instead of "mkdir". Change
owner of "/lib/mandos/plugins.d" and key
files. Bug fix: do not repair permissions of
"/lib/mandos/plugins.d". Bug fix: Really
avoid deliberately unreadable files and/or
directories.
* mandos-keygen (umask): Changed to "077".
- files added:
- .bzrignore
- files removed:
- ca.pem
- files renamed:
- server.py => mandos
- server.conf => mandos.conf
- plugbasedclient.c => plugin-runner.c
- plugins.d/passprompt.c => plugins.d/password-prompt.c
- plugins.d/mandosclient.c => plugins.d/password-request.c
- files modified:
- Makefile
added
removed
plugins.d/password-request.c
32
32
#define _LARGEFILE_SOURCE
33
33
#define _FILE_OFFSET_BITS 64
34
34
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
36
36
37
#include <stdio.h>
38
#include <assert.h>
39
#include <stdlib.h>
40
#include <time.h>
41
#include <net/if.h> /* if_nametoindex */
42
#include <sys/ioctl.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
43
SIOCSIFFLAGS */
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() */
44
61
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
45
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 */
46
74
75
/* Avahi */
76
/* All Avahi types, constants and functions
77
Avahi*, avahi_*,
78
AVAHI_* */
47
79
#include <avahi-core/core.h>
48
80
#include <avahi-core/lookup.h>
49
81
#include <avahi-core/log.h>
51
83
#include <avahi-common/malloc.h>
52
84
#include <avahi-common/error.h>
53
85
54
/* Mandos client part */
55
#include <sys/types.h> /* socket(), inet_pton() */
56
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
57
struct in6_addr, inet_pton() */
58
#include <gnutls/gnutls.h> /* All GnuTLS stuff */
59
#include <gnutls/openpgp.h> /* GnuTLS with openpgp stuff */
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 */
60
94
61
#include <unistd.h> /* close() */
62
#include <netinet/in.h>
63
#include <stdbool.h> /* true */
64
#include <string.h> /* memset */
65
#include <arpa/inet.h> /* inet_pton() */
66
#include <iso646.h> /* not */
67
#include <net/if.h> /* IF_NAMESIZE */
68
#include <argp.h> /* struct argp_option,
69
struct argp_state, struct argp,
70
argp_parse() */
71
95
/* GPGME */
72
#include <errno.h> /* perror() */
73
#include <gpgme.h>
96
#include <gpgme.h> /* All GPGME types, constants and
97
functions:
98
gpgme_*
99
GPGME_PROTOCOL_OpenPGP,
100
GPG_ERR_NO_* */
74
101
75
102
#define BUFFER_SIZE 256
76
103
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 "pupkey.txt"
111
77
112
bool debug = false;
78
const char *keydir = "/conf/conf.d/mandos";
79
const char *argp_program_version = "mandosclient 0.9";
113
static const char mandos_protocol_version[] = "1";
114
const char *argp_program_version = "password-request 1.0";
80
115
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
81
const char mandos_protocol_version[] = "1";
82
116
83
/* Used for passing in values through all the callback functions */
117
/* Used for passing in values through the Avahi callback functions */
84
118
typedef struct {
85
119
AvahiSimplePoll *simple_poll;
86
120
AvahiServer *server;
88
122
unsigned int dh_bits;
89
123
gnutls_dh_params_t dh_params;
90
124
const char *priority;
125
gpgme_ctx_t ctx;
91
126
} mandos_context;
92
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
*/
93
133
size_t adjustbuffer(char **buffer, size_t buffer_length,
94
134
size_t buffer_capacity){
95
135
if (buffer_length + BUFFER_SIZE > buffer_capacity){
103
143
}
104
144
105
145
/*
106
* Decrypt OpenPGP data using keyrings in HOMEDIR.
107
* Returns -1 on error
146
* Initialize GPGME.
108
147
*/
109
static ssize_t pgp_packet_decrypt (const char *cryptotext,
110
size_t crypto_size,
111
char **plaintext,
112
const char *homedir){
113
gpgme_data_t dh_crypto, dh_plain;
114
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;
115
151
gpgme_error_t rc;
116
ssize_t ret;
117
size_t plaintext_capacity = 0;
118
ssize_t plaintext_length = 0;
119
152
gpgme_engine_info_t engine_info;
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
}
120
189
121
190
if (debug){
122
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
191
fprintf(stderr, "Initialize gpgme\n");
123
192
}
124
193
125
194
/* Init GPGME */
126
195
gpgme_check_version(NULL);
127
196
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
128
197
if (rc != GPG_ERR_NO_ERROR){
129
198
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
130
199
gpgme_strsource(rc), gpgme_strerror(rc));
131
return -1;
200
return false;
132
201
}
133
134
/* Set GPGME home directory for the OpenPGP engine only */
202
203
/* Set GPGME home directory for the OpenPGP engine only */
135
204
rc = gpgme_get_engine_info (&engine_info);
136
205
if (rc != GPG_ERR_NO_ERROR){
137
206
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
138
207
gpgme_strsource(rc), gpgme_strerror(rc));
139
return -1;
208
return false;
140
209
}
141
210
while(engine_info != NULL){
142
211
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
143
212
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
144
engine_info->file_name, homedir);
213
engine_info->file_name, tempdir);
145
214
break;
146
215
}
147
216
engine_info = engine_info->next;
148
217
}
149
218
if(engine_info == NULL){
150
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
151
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");
152
254
}
153
255
154
256
/* Create new GPGME data buffer from memory cryptotext */
169
271
return -1;
170
272
}
171
273
172
/* Create new GPGME "context" */
173
rc = gpgme_new(&ctx);
174
if (rc != GPG_ERR_NO_ERROR){
175
fprintf(stderr, "bad gpgme_new: %s: %s\n",
176
gpgme_strsource(rc), gpgme_strerror(rc));
177
plaintext_length = -1;
178
goto decrypt_end;
179
}
180
181
274
/* Decrypt data from the cryptotext data buffer to the plaintext
182
275
data buffer */
183
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
276
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
184
277
if (rc != GPG_ERR_NO_ERROR){
185
278
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
186
279
gpgme_strsource(rc), gpgme_strerror(rc));
187
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
}
188
309
goto decrypt_end;
189
310
}
190
311
192
313
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
193
314
}
194
315
195
if (debug){
196
gpgme_decrypt_result_t result;
197
result = gpgme_op_decrypt_result(ctx);
198
if (result == NULL){
199
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
200
} else {
201
fprintf(stderr, "Unsupported algorithm: %s\n",
202
result->unsupported_algorithm);
203
fprintf(stderr, "Wrong key usage: %d\n",
204
result->wrong_key_usage);
205
if(result->file_name != NULL){
206
fprintf(stderr, "File name: %s\n", result->file_name);
207
}
208
gpgme_recipient_t recipient;
209
recipient = result->recipients;
210
if(recipient){
211
while(recipient != NULL){
212
fprintf(stderr, "Public key algorithm: %s\n",
213
gpgme_pubkey_algo_name(recipient->pubkey_algo));
214
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
215
fprintf(stderr, "Secret key available: %s\n",
216
recipient->status == GPG_ERR_NO_SECKEY
217
? "No" : "Yes");
218
recipient = recipient->next;
219
}
220
}
221
}
222
}
223
224
316
/* Seek back to the beginning of the GPGME plaintext data buffer */
225
317
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
226
318
perror("pgpme_data_seek");
230
322
231
323
*plaintext = NULL;
232
324
while(true){
233
plaintext_capacity = adjustbuffer(plaintext, (size_t)plaintext_length,
325
plaintext_capacity = adjustbuffer(plaintext,
326
(size_t)plaintext_length,
234
327
plaintext_capacity);
235
328
if (plaintext_capacity == 0){
236
329
perror("adjustbuffer");
252
345
}
253
346
plaintext_length += ret;
254
347
}
255
348
256
349
if(debug){
257
350
fprintf(stderr, "Decrypted password is: ");
258
351
for(ssize_t i = 0; i < plaintext_length; i++){
272
365
}
273
366
274
367
static const char * safer_gnutls_strerror (int value) {
275
const char *ret = gnutls_strerror (value);
368
const char *ret = gnutls_strerror (value); /* Spurious warning */
276
369
if (ret == NULL)
277
370
ret = "(unknown)";
278
371
return ret;
285
378
}
286
379
287
380
static int init_gnutls_global(mandos_context *mc,
288
const char *pubkeyfile,
289
const char *seckeyfile){
381
const char *pubkeyfilename,
382
const char *seckeyfilename){
290
383
int ret;
291
384
292
385
if(debug){
293
386
fprintf(stderr, "Initializing GnuTLS\n");
294
387
}
295
296
if ((ret = gnutls_global_init ())
297
!= GNUTLS_E_SUCCESS) {
388
389
ret = gnutls_global_init();
390
if (ret != GNUTLS_E_SUCCESS) {
298
391
fprintf (stderr, "GnuTLS global_init: %s\n",
299
392
safer_gnutls_strerror(ret));
300
393
return -1;
309
402
}
310
403
311
404
/* OpenPGP credentials */
312
if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))
313
!= GNUTLS_E_SUCCESS) {
314
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 */
315
409
safer_gnutls_strerror(ret));
410
gnutls_global_deinit ();
316
411
return -1;
317
412
}
318
413
319
414
if(debug){
320
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
321
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
322
seckeyfile);
415
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
416
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
417
seckeyfilename);
323
418
}
324
419
325
420
ret = gnutls_certificate_set_openpgp_key_file
326
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
421
(mc->cred, pubkeyfilename, seckeyfilename,
422
GNUTLS_OPENPGP_FMT_BASE64);
327
423
if (ret != GNUTLS_E_SUCCESS) {
328
424
fprintf(stderr,
329
425
"Error[%d] while reading the OpenPGP key pair ('%s',"
330
" '%s')\n", ret, pubkeyfile, seckeyfile);
331
fprintf(stdout, "The GnuTLS error is: %s\n",
426
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
427
fprintf(stderr, "The GnuTLS error is: %s\n",
332
428
safer_gnutls_strerror(ret));
333
return -1;
429
goto globalfail;
334
430
}
335
431
336
432
/* GnuTLS server initialization */
338
434
if (ret != GNUTLS_E_SUCCESS) {
339
435
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
340
436
" %s\n", safer_gnutls_strerror(ret));
341
return -1;
437
goto globalfail;
342
438
}
343
439
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
344
440
if (ret != GNUTLS_E_SUCCESS) {
345
441
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
346
442
safer_gnutls_strerror(ret));
347
return -1;
443
goto globalfail;
348
444
}
349
445
350
446
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
351
447
352
448
return 0;
449
450
globalfail:
451
452
gnutls_certificate_free_credentials(mc->cred);
453
gnutls_global_deinit();
454
return -1;
353
455
}
354
456
355
static int init_gnutls_session(mandos_context *mc, gnutls_session_t *session){
457
static int init_gnutls_session(mandos_context *mc,
458
gnutls_session_t *session){
356
459
int ret;
357
460
/* GnuTLS session creation */
358
461
ret = gnutls_init(session, GNUTLS_SERVER);
368
471
fprintf(stderr, "Syntax error at: %s\n", err);
369
472
fprintf(stderr, "GnuTLS error: %s\n",
370
473
safer_gnutls_strerror(ret));
474
gnutls_deinit (*session);
371
475
return -1;
372
476
}
373
477
}
377
481
if (ret != GNUTLS_E_SUCCESS) {
378
482
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
379
483
safer_gnutls_strerror(ret));
484
gnutls_deinit (*session);
380
485
return -1;
381
486
}
382
487
398
503
AvahiIfIndex if_index,
399
504
mandos_context *mc){
400
505
int ret, tcp_sd;
401
struct sockaddr_in6 to;
506
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
402
507
char *buffer = NULL;
403
508
char *decrypted_buffer;
404
509
size_t buffer_length = 0;
408
513
int retval = 0;
409
514
char interface[IF_NAMESIZE];
410
515
gnutls_session_t session;
411
gnutls_dh_params_t dh_params;
412
516
413
517
ret = init_gnutls_session (mc, &session);
414
518
if (ret != 0){
416
520
}
417
521
418
522
if(debug){
419
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
420
ip, port);
523
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
524
"\n", ip, port);
421
525
}
422
526
423
527
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
425
529
perror("socket");
426
530
return -1;
427
531
}
428
532
429
533
if(debug){
430
534
if(if_indextoname((unsigned int)if_index, interface) == NULL){
431
535
perror("if_indextoname");
434
538
fprintf(stderr, "Binding to interface %s\n", interface);
435
539
}
436
540
437
memset(&to,0,sizeof(to)); /* Spurious warning */
438
to.sin6_family = AF_INET6;
541
memset(&to, 0, sizeof(to));
542
to.in6.sin6_family = AF_INET6;
439
543
/* It would be nice to have a way to detect if we were passed an
440
544
IPv4 address here. Now we assume an IPv6 address. */
441
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
545
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
442
546
if (ret < 0 ){
443
547
perror("inet_pton");
444
548
return -1;
447
551
fprintf(stderr, "Bad address: %s\n", ip);
448
552
return -1;
449
553
}
450
to.sin6_port = htons(port); /* Spurious warning */
554
to.in6.sin6_port = htons(port); /* Spurious warning */
451
555
452
to.sin6_scope_id = (uint32_t)if_index;
556
to.in6.sin6_scope_id = (uint32_t)if_index;
453
557
454
558
if(debug){
455
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
559
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
560
port);
456
561
char addrstr[INET6_ADDRSTRLEN] = "";
457
if(inet_ntop(to.sin6_family, &(to.sin6_addr), addrstr,
562
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
458
563
sizeof(addrstr)) == NULL){
459
564
perror("inet_ntop");
460
565
} else {
464
569
}
465
570
}
466
571
467
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
572
ret = connect(tcp_sd, &to.in, sizeof(to));
468
573
if (ret < 0){
469
574
perror("connect");
470
575
return -1;
471
576
}
472
577
473
578
const char *out = mandos_protocol_version;
474
579
written = 0;
475
580
while (true){
493
598
}
494
599
}
495
600
}
496
601
497
602
if(debug){
498
603
fprintf(stderr, "Establishing TLS session with %s\n", ip);
499
604
}
500
605
501
606
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
502
607
503
ret = gnutls_handshake (session);
608
do{
609
ret = gnutls_handshake (session);
610
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
504
611
505
612
if (ret != GNUTLS_E_SUCCESS){
506
613
if(debug){
517
624
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
518
625
ip);
519
626
}
520
627
521
628
while(true){
522
buffer_capacity = adjustbuffer(&buffer, buffer_length, buffer_capacity);
629
buffer_capacity = adjustbuffer(&buffer, buffer_length,
630
buffer_capacity);
523
631
if (buffer_capacity == 0){
524
632
perror("adjustbuffer");
525
633
retval = -1;
537
645
case GNUTLS_E_AGAIN:
538
646
break;
539
647
case GNUTLS_E_REHANDSHAKE:
540
ret = gnutls_handshake (session);
648
do{
649
ret = gnutls_handshake (session);
650
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
541
651
if (ret < 0){
542
652
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
543
653
gnutls_perror (ret);
564
674
gnutls_bye (session, GNUTLS_SHUT_RDWR);
565
675
566
676
if (buffer_length > 0){
567
decrypted_buffer_size = pgp_packet_decrypt(buffer,
677
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
568
678
buffer_length,
569
&decrypted_buffer,
570
keydir);
679
&decrypted_buffer);
571
680
if (decrypted_buffer_size >= 0){
572
681
written = 0;
573
682
while(written < (size_t) decrypted_buffer_size){
588
697
} else {
589
698
retval = -1;
590
699
}
700
} else {
701
retval = -1;
591
702
}
592
703
593
704
/* Shutdown procedure */
594
705
595
706
mandos_end:
596
707
free(buffer);
597
close(tcp_sd);
708
ret = TEMP_FAILURE_RETRY(close(tcp_sd));
709
if(ret == -1){
710
perror("close");
711
}
598
712
gnutls_deinit (session);
599
gnutls_certificate_free_credentials (mc->cred);
600
gnutls_global_deinit ();
601
713
return retval;
602
714
}
603
715
616
728
flags,
617
729
void* userdata) {
618
730
mandos_context *mc = userdata;
619
assert(r); /* Spurious warning */
731
assert(r);
620
732
621
733
/* Called whenever a service has been resolved successfully or
622
734
timed out */
634
746
char ip[AVAHI_ADDRESS_STR_MAX];
635
747
avahi_address_snprint(ip, sizeof(ip), address);
636
748
if(debug){
637
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %d) on"
638
" port %d\n", name, host_name, ip, interface, port);
749
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
750
PRIu16 ") on port %d\n", name, host_name, ip,
751
interface, port);
639
752
}
640
753
int ret = start_mandos_communication(ip, port, interface, mc);
641
754
if (ret == 0){
642
exit(EXIT_SUCCESS);
755
avahi_simple_poll_quit(mc->simple_poll);
643
756
}
644
757
}
645
758
}
657
770
flags,
658
771
void* userdata) {
659
772
mandos_context *mc = userdata;
660
assert(b); /* Spurious warning */
773
assert(b);
661
774
662
775
/* Called whenever a new services becomes available on the LAN or
663
776
is removed from the LAN */
697
810
}
698
811
}
699
812
700
/* Combines file name and path and returns the malloced new
701
string. some sane checks could/should be added */
702
static const char *combinepath(const char *first, const char *second){
703
size_t f_len = strlen(first);
704
size_t s_len = strlen(second);
705
char *tmp = malloc(f_len + s_len + 2);
706
if (tmp == NULL){
707
return NULL;
708
}
709
if(f_len > 0){
710
memcpy(tmp, first, f_len); /* Spurious warning */
711
}
712
tmp[f_len] = '/';
713
if(s_len > 0){
714
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
715
}
716
tmp[f_len + 1 + s_len] = '\0';
717
return tmp;
718
}
719
720
721
813
int main(int argc, char *argv[]){
722
814
AvahiSServiceBrowser *sb = NULL;
723
815
int error;
729
821
uid_t uid;
730
822
gid_t gid;
731
823
char *connect_to = NULL;
824
char tempdir[] = "/tmp/mandosXXXXXX";
732
825
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
733
const char *pubkeyfile = "pubkey.txt";
734
const char *seckeyfile = "seckey.txt";
826
const char *seckey = PATHDIR "/" SECKEY;
827
const char *pubkey = PATHDIR "/" PUBKEY;
828
735
829
mandos_context mc = { .simple_poll = NULL, .server = NULL,
736
.dh_bits = 1024, .priority = "SECURE256"};
830
.dh_bits = 1024, .priority = "SECURE256"
831
":!CTYPE-X.509:+CTYPE-OPENPGP" };
832
bool gnutls_initalized = false;
833
bool pgpme_initalized = false;
737
834
738
835
{
739
836
struct argp_option options[] = {
740
837
{ .name = "debug", .key = 128,
741
838
.doc = "Debug mode", .group = 3 },
742
839
{ .name = "connect", .key = 'c',
743
.arg = "IP",
744
.doc = "Connect directly to a sepcified mandos server", .group = 1 },
840
.arg = "ADDRESS:PORT",
841
.doc = "Connect directly to a specific Mandos server",
842
.group = 1 },
745
843
{ .name = "interface", .key = 'i',
746
.arg = "INTERFACE",
747
.doc = "Interface that Avahi will conntect through", .group = 1 },
748
{ .name = "keydir", .key = 'd',
749
.arg = "KEYDIR",
750
.doc = "Directory where the openpgp keyring is", .group = 1 },
844
.arg = "NAME",
845
.doc = "Interface that will be used to search for Mandos"
846
" servers",
847
.group = 1 },
751
848
{ .name = "seckey", .key = 's',
752
.arg = "SECKEY",
753
.doc = "Secret openpgp key for gnutls authentication", .group = 1 },
849
.arg = "FILE",
850
.doc = "OpenPGP secret key file base name",
851
.group = 1 },
754
852
{ .name = "pubkey", .key = 'p',
755
.arg = "PUBKEY",
756
.doc = "Public openpgp key for gnutls authentication", .group = 2 },
853
.arg = "FILE",
854
.doc = "OpenPGP public key file base name",
855
.group = 2 },
757
856
{ .name = "dh-bits", .key = 129,
758
857
.arg = "BITS",
759
.doc = "dh-bits to use in gnutls communication", .group = 2 },
858
.doc = "Bit length of the prime number used in the"
859
" Diffie-Hellman key exchange",
860
.group = 2 },
760
861
{ .name = "priority", .key = 130,
761
.arg = "PRIORITY",
762
.doc = "GNUTLS priority", .group = 1 },
862
.arg = "STRING",
863
.doc = "GnuTLS priority string for the TLS handshake",
864
.group = 1 },
763
865
{ .name = NULL }
764
866
};
765
766
867
767
error_t parse_opt (int key, char *arg, struct argp_state *state) {
768
/* Get the INPUT argument from `argp_parse', which we know is a
769
pointer to our plugin list pointer. */
868
error_t parse_opt (int key, char *arg,
869
struct argp_state *state) {
870
/* Get the INPUT argument from `argp_parse', which we know is
871
a pointer to our plugin list pointer. */
770
872
switch (key) {
771
case 128:
873
case 128: /* --debug */
772
874
debug = true;
773
875
break;
774
case 'c':
876
case 'c': /* --connect */
775
877
connect_to = arg;
776
878
break;
777
case 'i':
879
case 'i': /* --interface */
778
880
interface = arg;
779
881
break;
780
case 'd':
781
keydir = arg;
782
break;
783
case 's':
784
seckeyfile = arg;
785
break;
786
case 'p':
787
pubkeyfile = arg;
788
break;
789
case 129:
882
case 's': /* --seckey */
883
seckey = arg;
884
break;
885
case 'p': /* --pubkey */
886
pubkey = arg;
887
break;
888
case 129: /* --dh-bits */
790
889
errno = 0;
791
890
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
792
891
if (errno){
794
893
exit(EXIT_FAILURE);
795
894
}
796
895
break;
797
case 130:
896
case 130: /* --priority */
798
897
mc.priority = arg;
799
898
break;
800
899
case ARGP_KEY_ARG:
801
900
argp_usage (state);
901
case ARGP_KEY_END:
802
902
break;
803
case ARGP_KEY_END:
804
break;
805
903
default:
806
904
return ARGP_ERR_UNKNOWN;
807
905
}
808
906
return 0;
809
907
}
810
908
811
909
struct argp argp = { .options = options, .parser = parse_opt,
812
910
.args_doc = "",
813
.doc = "Mandos client -- Get and decrypt passwords from mandos server" };
814
argp_parse (&argp, argc, argv, 0, 0, NULL);
815
}
816
817
pubkeyfile = combinepath(keydir, pubkeyfile);
818
if (pubkeyfile == NULL){
819
perror("combinepath");
820
exitcode = EXIT_FAILURE;
821
goto end;
911
.doc = "Mandos client -- Get and decrypt"
912
" passwords from a Mandos server" };
913
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
914
if (ret == ARGP_ERR_UNKNOWN){
915
fprintf(stderr, "Unknown error while parsing arguments\n");
916
exitcode = EXIT_FAILURE;
917
goto end;
918
}
822
919
}
823
920
824
seckeyfile = combinepath(keydir, seckeyfile);
825
if (seckeyfile == NULL){
826
perror("combinepath");
827
goto end;
828
}
829
830
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
921
ret = init_gnutls_global(&mc, pubkey, seckey);
831
922
if (ret == -1){
832
fprintf(stderr, "init_gnutls_global\n");
923
fprintf(stderr, "init_gnutls_global failed\n");
924
exitcode = EXIT_FAILURE;
833
925
goto end;
926
} else {
927
gnutls_initalized = true;
834
928
}
835
929
930
if(mkdtemp(tempdir) == NULL){
931
perror("mkdtemp");
932
tempdir[0] = '\0';
933
goto end;
934
}
935
936
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
937
fprintf(stderr, "pgpme_initalized failed\n");
938
exitcode = EXIT_FAILURE;
939
goto end;
940
} else {
941
pgpme_initalized = true;
942
}
943
944
/* If the interface is down, bring it up */
945
{
946
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
947
if(sd < 0) {
948
perror("socket");
949
exitcode = EXIT_FAILURE;
950
goto end;
951
}
952
strcpy(network.ifr_name, interface);
953
ret = ioctl(sd, SIOCGIFFLAGS, &network);
954
if(ret == -1){
955
perror("ioctl SIOCGIFFLAGS");
956
exitcode = EXIT_FAILURE;
957
goto end;
958
}
959
if((network.ifr_flags & IFF_UP) == 0){
960
network.ifr_flags |= IFF_UP;
961
ret = ioctl(sd, SIOCSIFFLAGS, &network);
962
if(ret == -1){
963
perror("ioctl SIOCSIFFLAGS");
964
exitcode = EXIT_FAILURE;
965
goto end;
966
}
967
}
968
ret = TEMP_FAILURE_RETRY(close(sd));
969
if(ret == -1){
970
perror("close");
971
}
972
}
973
836
974
uid = getuid();
837
975
gid = getgid();
838
976
839
977
ret = setuid(uid);
840
978
if (ret == -1){
841
979
perror("setuid");
879
1017
goto end;
880
1018
}
881
1019
882
/* If the interface is down, bring it up */
883
{
884
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
885
if(sd < 0) {
886
perror("socket");
887
exitcode = EXIT_FAILURE;
888
goto end;
889
}
890
strcpy(network.ifr_name, interface); /* Spurious warning */
891
ret = ioctl(sd, SIOCGIFFLAGS, &network);
892
if(ret == -1){
893
perror("ioctl SIOCGIFFLAGS");
894
exitcode = EXIT_FAILURE;
895
goto end;
896
}
897
if((network.ifr_flags & IFF_UP) == 0){
898
network.ifr_flags |= IFF_UP;
899
ret = ioctl(sd, SIOCSIFFLAGS, &network);
900
if(ret == -1){
901
perror("ioctl SIOCSIFFLAGS");
902
exitcode = EXIT_FAILURE;
903
goto end;
904
}
905
}
906
close(sd);
907
}
908
909
1020
if (not debug){
910
1021
avahi_set_log_function(empty_log);
911
1022
}
921
1032
exitcode = EXIT_FAILURE;
922
1033
goto end;
923
1034
}
924
1035
925
1036
{
926
1037
AvahiServerConfig config;
927
1038
/* Do not publish any local Zeroconf records */
930
1041
config.publish_addresses = 0;
931
1042
config.publish_workstation = 0;
932
1043
config.publish_domain = 0;
933
1044
934
1045
/* Allocate a new server */
935
1046
mc.server = avahi_server_new(avahi_simple_poll_get
936
1047
(mc.simple_poll), &config, NULL,
937
1048
NULL, &error);
938
1049
939
1050
/* Free the Avahi configuration data */
940
1051
avahi_server_config_free(&config);
941
1052
}
961
1072
}
962
1073
963
1074
/* Run the main loop */
964
1075
965
1076
if (debug){
966
1077
fprintf(stderr, "Starting Avahi loop search\n");
967
1078
}
969
1080
avahi_simple_poll_loop(mc.simple_poll);
970
1081
971
1082
end:
972
1083
973
1084
if (debug){
974
1085
fprintf(stderr, "%s exiting\n", argv[0]);
975
1086
}
980
1091
981
1092
if (mc.server != NULL)
982
1093
avahi_server_free(mc.server);
983
1094
984
1095
if (mc.simple_poll != NULL)
985
1096
avahi_simple_poll_free(mc.simple_poll);
986
free(pubkeyfile);
987
free(seckeyfile);
988
1097
1098
if (gnutls_initalized){
1099
gnutls_certificate_free_credentials(mc.cred);
1100
gnutls_global_deinit ();
1101
}
1102
1103
if(pgpme_initalized){
1104
gpgme_release(mc.ctx);
1105
}
1106
1107
/* Removes the temp directory used by GPGME */
1108
if(tempdir[0] != '\0'){
1109
DIR *d;
1110
struct dirent *direntry;
1111
d = opendir(tempdir);
1112
if(d == NULL){
1113
perror("opendir");
1114
} else {
1115
while(true){
1116
direntry = readdir(d);
1117
if(direntry == NULL){
1118
break;
1119
}
1120
if (direntry->d_type == DT_REG){
1121
char *fullname = NULL;
1122
ret = asprintf(&fullname, "%s/%s", tempdir,
1123
direntry->d_name);
1124
if(ret < 0){
1125
perror("asprintf");
1126
continue;
1127
}
1128
ret = unlink(fullname);
1129
if(ret == -1){
1130
fprintf(stderr, "unlink(\"%s\"): %s",
1131
fullname, strerror(errno));
1132
}
1133
free(fullname);
1134
}
1135
}
1136
}
1137
ret = rmdir(tempdir);
1138
if(ret == -1){
1139
perror("rmdir");
1140
}
1141
}
1142
989
1143
return exitcode;
990
1144
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0