26
25
* along with this program. If not, see
27
26
* <http://www.gnu.org/licenses/>.
29
* Contact the authors at <mandos@fukt.bsnet.se>.
28
* Contact the authors at <https://www.fukt.bsnet.se/~belorn/> and
29
* <https://www.fukt.bsnet.se/~teddy/>.
32
/* Needed by GPGME, specifically gpgme_data_seek() */
32
#define _FORTIFY_SOURCE 2
33
34
#define _LARGEFILE_SOURCE
34
35
#define _FILE_OFFSET_BITS 64
36
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
38
#include <stdio.h> /* fprintf(), stderr, fwrite(),
39
stdout, ferror(), sscanf(),
41
#include <stdint.h> /* uint16_t, uint32_t */
42
#include <stddef.h> /* NULL, size_t, ssize_t */
43
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
45
#include <stdbool.h> /* bool, true */
46
#include <string.h> /* memset(), strcmp(), strlen(),
47
strerror(), asprintf(), strcpy() */
48
#include <sys/ioctl.h> /* ioctl */
49
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
50
sockaddr_in6, PF_INET6,
51
SOCK_STREAM, INET6_ADDRSTRLEN,
52
uid_t, gid_t, open(), opendir(),
54
#include <sys/stat.h> /* open() */
55
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
56
struct in6_addr, inet_pton(),
58
#include <fcntl.h> /* open() */
59
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
62
#include <assert.h> /* assert() */
63
#include <errno.h> /* perror(), errno */
64
#include <time.h> /* nanosleep(), time() */
65
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
66
SIOCSIFFLAGS, if_indextoname(),
67
if_nametoindex(), IF_NAMESIZE */
68
#include <netinet/in.h>
69
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
70
getuid(), getgid(), setuid(),
72
#include <arpa/inet.h> /* inet_pton(), htons */
73
#include <iso646.h> /* not, and, or */
74
#include <argp.h> /* struct argp_option, error_t, struct
75
argp_state, struct argp,
76
argp_parse(), ARGP_KEY_ARG,
77
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
79
#include <sys/klog.h> /* klogctl() */
83
/* All Avahi types, constants and functions
41
#include <net/if.h> /* if_nametoindex */
86
43
#include <avahi-core/core.h>
87
44
#include <avahi-core/lookup.h>
88
45
#include <avahi-core/log.h>
90
47
#include <avahi-common/malloc.h>
91
48
#include <avahi-common/error.h>
94
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
97
init_gnutls_session(),
99
#include <gnutls/openpgp.h>
100
/* gnutls_certificate_set_openpgp_key_file(),
101
GNUTLS_OPENPGP_FMT_BASE64 */
104
#include <gpgme.h> /* All GPGME types, constants and
107
GPGME_PROTOCOL_OpenPGP,
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 */
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 */
65
#include <errno.h> /* perror() */
72
#define CERT_ROOT "/conf/conf.d/cryptkeyreq/"
74
#define CERTFILE CERT_ROOT "openpgp-client.txt"
75
#define KEYFILE CERT_ROOT "openpgp-client-key.txt"
110
76
#define BUFFER_SIZE 256
112
#define PATHDIR "/conf/conf.d/mandos"
113
#define SECKEY "seckey.txt"
114
#define PUBKEY "pubkey.txt"
116
79
bool debug = false;
117
static const char mandos_protocol_version[] = "1";
118
const char *argp_program_version = "mandos-client " VERSION;
119
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
121
/* Used for passing in values through the Avahi callback functions */
123
AvahiSimplePoll *simple_poll;
82
gnutls_session_t session;
125
83
gnutls_certificate_credentials_t cred;
126
unsigned int dh_bits;
127
84
gnutls_dh_params_t dh_params;
128
const char *priority;
88
ssize_t pgp_packet_decrypt (char *packet, size_t packet_size,
89
char **new_packet, const char *homedir){
90
gpgme_data_t dh_crypto, dh_plain;
133
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
134
* "buffer_capacity" is how much is currently allocated,
135
* "buffer_length" is how much is already used.
137
size_t adjustbuffer(char **buffer, size_t buffer_length,
138
size_t buffer_capacity){
139
if(buffer_length + BUFFER_SIZE > buffer_capacity){
140
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
144
buffer_capacity += BUFFER_SIZE;
146
return buffer_capacity;
152
static bool init_gpgme(mandos_context *mc, const char *seckey,
153
const char *pubkey, const char *tempdir){
94
ssize_t new_packet_capacity = 0;
95
ssize_t new_packet_length = 0;
156
96
gpgme_engine_info_t engine_info;
160
* Helper function to insert pub and seckey to the engine keyring.
162
bool import_key(const char *filename){
164
gpgme_data_t pgp_data;
166
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
172
rc = gpgme_data_new_from_fd(&pgp_data, fd);
173
if(rc != GPG_ERR_NO_ERROR){
174
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
175
gpgme_strsource(rc), gpgme_strerror(rc));
179
rc = gpgme_op_import(mc->ctx, pgp_data);
180
if(rc != GPG_ERR_NO_ERROR){
181
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
182
gpgme_strsource(rc), gpgme_strerror(rc));
186
ret = (int)TEMP_FAILURE_RETRY(close(fd));
190
gpgme_data_release(pgp_data);
195
fprintf(stderr, "Initialize gpgme\n");
99
fprintf(stderr, "Trying to decrypt OpenPGP packet\n");
199
103
gpgme_check_version(NULL);
200
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
201
if(rc != GPG_ERR_NO_ERROR){
202
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
203
gpgme_strsource(rc), gpgme_strerror(rc));
104
gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
207
/* Set GPGME home directory for the OpenPGP engine only */
208
rc = gpgme_get_engine_info(&engine_info);
209
if(rc != GPG_ERR_NO_ERROR){
106
/* Set GPGME home directory */
107
rc = gpgme_get_engine_info (&engine_info);
108
if (rc != GPG_ERR_NO_ERROR){
210
109
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
211
110
gpgme_strsource(rc), gpgme_strerror(rc));
214
113
while(engine_info != NULL){
215
114
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
216
115
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
217
engine_info->file_name, tempdir);
116
engine_info->file_name, homedir);
220
119
engine_info = engine_info->next;
222
121
if(engine_info == NULL){
223
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
227
/* Create new GPGME "context" */
228
rc = gpgme_new(&(mc->ctx));
229
if(rc != GPG_ERR_NO_ERROR){
230
fprintf(stderr, "bad gpgme_new: %s: %s\n",
231
gpgme_strsource(rc), gpgme_strerror(rc));
235
if(not import_key(pubkey) or not import_key(seckey)){
243
* Decrypt OpenPGP data.
244
* Returns -1 on error
246
static ssize_t pgp_packet_decrypt(const mandos_context *mc,
247
const char *cryptotext,
250
gpgme_data_t dh_crypto, dh_plain;
253
size_t plaintext_capacity = 0;
254
ssize_t plaintext_length = 0;
257
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
260
/* Create new GPGME data buffer from memory cryptotext */
261
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
263
if(rc != GPG_ERR_NO_ERROR){
122
fprintf(stderr, "Could not set home dir to %s\n", homedir);
126
/* Create new GPGME data buffer from packet buffer */
127
rc = gpgme_data_new_from_mem(&dh_crypto, packet, packet_size, 0);
128
if (rc != GPG_ERR_NO_ERROR){
264
129
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
265
130
gpgme_strsource(rc), gpgme_strerror(rc));
269
134
/* Create new empty GPGME data buffer for the plaintext */
270
135
rc = gpgme_data_new(&dh_plain);
271
if(rc != GPG_ERR_NO_ERROR){
136
if (rc != GPG_ERR_NO_ERROR){
272
137
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
273
138
gpgme_strsource(rc), gpgme_strerror(rc));
274
gpgme_data_release(dh_crypto);
278
/* Decrypt data from the cryptotext data buffer to the plaintext
280
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
281
if(rc != GPG_ERR_NO_ERROR){
142
/* Create new GPGME "context" */
143
rc = gpgme_new(&ctx);
144
if (rc != GPG_ERR_NO_ERROR){
145
fprintf(stderr, "bad gpgme_new: %s: %s\n",
146
gpgme_strsource(rc), gpgme_strerror(rc));
150
/* Decrypt data from the FILE pointer to the plaintext data
152
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
153
if (rc != GPG_ERR_NO_ERROR){
282
154
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
283
155
gpgme_strsource(rc), gpgme_strerror(rc));
284
plaintext_length = -1;
286
gpgme_decrypt_result_t result;
287
result = gpgme_op_decrypt_result(mc->ctx);
289
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
291
fprintf(stderr, "Unsupported algorithm: %s\n",
292
result->unsupported_algorithm);
293
fprintf(stderr, "Wrong key usage: %u\n",
294
result->wrong_key_usage);
295
if(result->file_name != NULL){
296
fprintf(stderr, "File name: %s\n", result->file_name);
298
gpgme_recipient_t recipient;
299
recipient = result->recipients;
301
while(recipient != NULL){
302
fprintf(stderr, "Public key algorithm: %s\n",
303
gpgme_pubkey_algo_name(recipient->pubkey_algo));
304
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
305
fprintf(stderr, "Secret key available: %s\n",
306
recipient->status == GPG_ERR_NO_SECKEY
308
recipient = recipient->next;
160
fprintf(stderr, "Decryption of OpenPGP packet succeeded\n");
164
gpgme_decrypt_result_t result;
165
result = gpgme_op_decrypt_result(ctx);
167
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
169
fprintf(stderr, "Unsupported algorithm: %s\n",
170
result->unsupported_algorithm);
171
fprintf(stderr, "Wrong key usage: %d\n",
172
result->wrong_key_usage);
173
if(result->file_name != NULL){
174
fprintf(stderr, "File name: %s\n", result->file_name);
176
gpgme_recipient_t recipient;
177
recipient = result->recipients;
179
while(recipient != NULL){
180
fprintf(stderr, "Public key algorithm: %s\n",
181
gpgme_pubkey_algo_name(recipient->pubkey_algo));
182
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
183
fprintf(stderr, "Secret key available: %s\n",
184
recipient->status == GPG_ERR_NO_SECKEY
186
recipient = recipient->next;
317
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
192
/* Delete the GPGME FILE pointer cryptotext data buffer */
193
gpgme_data_release(dh_crypto);
320
195
/* Seek back to the beginning of the GPGME plaintext data buffer */
321
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
322
perror("gpgme_data_seek");
323
plaintext_length = -1;
196
gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET);
329
plaintext_capacity = adjustbuffer(plaintext,
330
(size_t)plaintext_length,
332
if(plaintext_capacity == 0){
333
perror("adjustbuffer");
334
plaintext_length = -1;
200
if (new_packet_length + BUFFER_SIZE > new_packet_capacity){
201
*new_packet = realloc(*new_packet,
202
(unsigned int)new_packet_capacity
204
if (*new_packet == NULL){
208
new_packet_capacity += BUFFER_SIZE;
338
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
211
ret = gpgme_data_read(dh_plain, *new_packet + new_packet_length,
340
213
/* Print the data, if any */
346
218
perror("gpgme_data_read");
347
plaintext_length = -1;
350
plaintext_length += ret;
354
fprintf(stderr, "Decrypted password is: ");
355
for(ssize_t i = 0; i < plaintext_length; i++){
356
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
358
fprintf(stderr, "\n");
363
/* Delete the GPGME cryptotext data buffer */
364
gpgme_data_release(dh_crypto);
221
new_packet_length += ret;
224
/* FIXME: check characters before printing to screen so to not print
225
terminal control characters */
227
/* fprintf(stderr, "decrypted password is: "); */
228
/* fwrite(*new_packet, 1, new_packet_length, stderr); */
229
/* fprintf(stderr, "\n"); */
366
232
/* Delete the GPGME plaintext data buffer */
367
233
gpgme_data_release(dh_plain);
368
return plaintext_length;
234
return new_packet_length;
371
static const char * safer_gnutls_strerror(int value){
372
const char *ret = gnutls_strerror(value); /* Spurious warning from
373
-Wunreachable-code */
237
static const char * safer_gnutls_strerror (int value) {
238
const char *ret = gnutls_strerror (value);
375
240
ret = "(unknown)";
379
/* GnuTLS log function callback */
380
static void debuggnutls(__attribute__((unused)) int level,
382
fprintf(stderr, "GnuTLS: %s", string);
244
void debuggnutls(__attribute__((unused)) int level,
246
fprintf(stderr, "%s", string);
385
static int init_gnutls_global(mandos_context *mc,
386
const char *pubkeyfilename,
387
const char *seckeyfilename){
249
int initgnutls(encrypted_session *es){
391
254
fprintf(stderr, "Initializing GnuTLS\n");
394
ret = gnutls_global_init();
395
if(ret != GNUTLS_E_SUCCESS){
396
fprintf(stderr, "GnuTLS global_init: %s\n",
397
safer_gnutls_strerror(ret));
257
if ((ret = gnutls_global_init ())
258
!= GNUTLS_E_SUCCESS) {
259
fprintf (stderr, "global_init: %s\n", safer_gnutls_strerror(ret));
402
/* "Use a log level over 10 to enable all debugging options."
405
264
gnutls_global_set_log_level(11);
406
265
gnutls_global_set_log_function(debuggnutls);
409
/* OpenPGP credentials */
410
gnutls_certificate_allocate_credentials(&mc->cred);
411
if(ret != GNUTLS_E_SUCCESS){
412
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
416
safer_gnutls_strerror(ret));
417
gnutls_global_deinit();
268
/* openpgp credentials */
269
if ((ret = gnutls_certificate_allocate_credentials (&es->cred))
270
!= GNUTLS_E_SUCCESS) {
271
fprintf (stderr, "memory error: %s\n",
272
safer_gnutls_strerror(ret));
422
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
423
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
277
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
278
" and keyfile %s as GnuTLS credentials\n", CERTFILE,
427
282
ret = gnutls_certificate_set_openpgp_key_file
428
(mc->cred, pubkeyfilename, seckeyfilename,
429
GNUTLS_OPENPGP_FMT_BASE64);
430
if(ret != GNUTLS_E_SUCCESS){
432
"Error[%d] while reading the OpenPGP key pair ('%s',"
433
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
434
fprintf(stderr, "The GnuTLS error is: %s\n",
435
safer_gnutls_strerror(ret));
439
/* GnuTLS server initialization */
440
ret = gnutls_dh_params_init(&mc->dh_params);
441
if(ret != GNUTLS_E_SUCCESS){
442
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
443
" %s\n", safer_gnutls_strerror(ret));
446
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
447
if(ret != GNUTLS_E_SUCCESS){
448
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
449
safer_gnutls_strerror(ret));
453
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
459
gnutls_certificate_free_credentials(mc->cred);
460
gnutls_global_deinit();
461
gnutls_dh_params_deinit(mc->dh_params);
465
static int init_gnutls_session(mandos_context *mc,
466
gnutls_session_t *session){
468
/* GnuTLS session creation */
469
ret = gnutls_init(session, GNUTLS_SERVER);
470
if(ret != GNUTLS_E_SUCCESS){
283
(es->cred, CERTFILE, KEYFILE, GNUTLS_OPENPGP_FMT_BASE64);
284
if (ret != GNUTLS_E_SUCCESS) {
286
(stderr, "Error[%d] while reading the OpenPGP key pair ('%s',"
288
ret, CERTFILE, KEYFILE);
289
fprintf(stdout, "The Error is: %s\n",
290
safer_gnutls_strerror(ret));
294
//GnuTLS server initialization
295
if ((ret = gnutls_dh_params_init (&es->dh_params))
296
!= GNUTLS_E_SUCCESS) {
297
fprintf (stderr, "Error in dh parameter initialization: %s\n",
298
safer_gnutls_strerror(ret));
302
if ((ret = gnutls_dh_params_generate2 (es->dh_params, DH_BITS))
303
!= GNUTLS_E_SUCCESS) {
304
fprintf (stderr, "Error in prime generation: %s\n",
305
safer_gnutls_strerror(ret));
309
gnutls_certificate_set_dh_params (es->cred, es->dh_params);
311
// GnuTLS session creation
312
if ((ret = gnutls_init (&es->session, GNUTLS_SERVER))
313
!= GNUTLS_E_SUCCESS){
471
314
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
472
315
safer_gnutls_strerror(ret));
477
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
478
if(ret != GNUTLS_E_SUCCESS){
479
fprintf(stderr, "Syntax error at: %s\n", err);
480
fprintf(stderr, "GnuTLS error: %s\n",
481
safer_gnutls_strerror(ret));
482
gnutls_deinit(*session);
318
if ((ret = gnutls_priority_set_direct (es->session, "NORMAL", &err))
319
!= GNUTLS_E_SUCCESS) {
320
fprintf(stderr, "Syntax error at: %s\n", err);
321
fprintf(stderr, "GnuTLS error: %s\n",
322
safer_gnutls_strerror(ret));
487
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
489
if(ret != GNUTLS_E_SUCCESS){
490
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
326
if ((ret = gnutls_credentials_set
327
(es->session, GNUTLS_CRD_CERTIFICATE, es->cred))
328
!= GNUTLS_E_SUCCESS) {
329
fprintf(stderr, "Error setting a credentials set: %s\n",
491
330
safer_gnutls_strerror(ret));
492
gnutls_deinit(*session);
496
334
/* ignore client certificate if any. */
497
gnutls_certificate_server_set_request(*session,
335
gnutls_certificate_server_set_request (es->session,
500
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
338
gnutls_dh_set_prime_bits (es->session, DH_BITS);
505
/* Avahi log function callback */
506
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
507
__attribute__((unused)) const char *txt){}
343
void empty_log(__attribute__((unused)) AvahiLogLevel level,
344
__attribute__((unused)) const char *txt){}
509
/* Called when a Mandos server is found */
510
static int start_mandos_communication(const char *ip, uint16_t port,
511
AvahiIfIndex if_index,
346
int start_mandos_communication(const char *ip, uint16_t port,
347
unsigned int if_index){
515
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
349
struct sockaddr_in6 to;
350
encrypted_session es;
516
351
char *buffer = NULL;
517
352
char *decrypted_buffer;
518
353
size_t buffer_length = 0;
519
354
size_t buffer_capacity = 0;
520
355
ssize_t decrypted_buffer_size;
523
358
char interface[IF_NAMESIZE];
524
gnutls_session_t session;
526
ret = init_gnutls_session(mc, &session);
532
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
361
fprintf(stderr, "Setting up a tcp connection to %s\n", ip);
536
364
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
538
366
perror("socket");
543
if(if_indextoname((unsigned int)if_index, interface) == NULL){
370
if(if_indextoname(if_index, interface) == NULL){
544
372
perror("if_indextoname");
547
378
fprintf(stderr, "Binding to interface %s\n", interface);
550
memset(&to, 0, sizeof(to));
551
to.in6.sin6_family = AF_INET6;
552
/* It would be nice to have a way to detect if we were passed an
553
IPv4 address here. Now we assume an IPv6 address. */
554
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
381
memset(&to,0,sizeof(to)); /* Spurious warning */
382
to.sin6_family = AF_INET6;
383
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
556
385
perror("inet_pton");
560
389
fprintf(stderr, "Bad address: %s\n", ip);
563
to.in6.sin6_port = htons(port); /* Spurious warnings from
565
-Wunreachable-code */
392
to.sin6_port = htons(port); /* Spurious warning */
567
to.in6.sin6_scope_id = (uint32_t)if_index;
394
to.sin6_scope_id = (uint32_t)if_index;
570
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
572
char addrstr[INET6_ADDRSTRLEN] = "";
573
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
574
sizeof(addrstr)) == NULL){
577
if(strcmp(addrstr, ip) != 0){
578
fprintf(stderr, "Canonical address form: %s\n", addrstr);
397
fprintf(stderr, "Connection to: %s\n", ip);
583
ret = connect(tcp_sd, &to.in, sizeof(to));
400
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
585
402
perror("connect");
589
const char *out = mandos_protocol_version;
592
size_t out_size = strlen(out);
593
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
594
out_size - written));
600
written += (size_t)ret;
601
if(written < out_size){
604
if(out == mandos_protocol_version){
406
ret = initgnutls (&es);
412
gnutls_transport_set_ptr (es.session,
413
(gnutls_transport_ptr_t) tcp_sd);
614
416
fprintf(stderr, "Establishing TLS session with %s\n", ip);
617
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
620
ret = gnutls_handshake(session);
621
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
623
if(ret != GNUTLS_E_SUCCESS){
419
ret = gnutls_handshake (es.session);
421
if (ret != GNUTLS_E_SUCCESS){
625
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
423
fprintf(stderr, "\n*** Handshake failed ***\n");
632
/* Read OpenPGP packet that contains the wanted password */
430
//Retrieve OpenPGP packet that contains the wanted password
635
433
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
640
buffer_capacity = adjustbuffer(&buffer, buffer_length,
642
if(buffer_capacity == 0){
643
perror("adjustbuffer");
438
if (buffer_length + BUFFER_SIZE > buffer_capacity){
439
buffer = realloc(buffer, buffer_capacity + BUFFER_SIZE);
444
buffer_capacity += BUFFER_SIZE;
648
sret = gnutls_record_recv(session, buffer+buffer_length,
447
ret = gnutls_record_recv
448
(es.session, buffer+buffer_length, BUFFER_SIZE);
655
454
case GNUTLS_E_INTERRUPTED:
656
455
case GNUTLS_E_AGAIN:
658
457
case GNUTLS_E_REHANDSHAKE:
660
ret = gnutls_handshake(session);
661
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
663
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
458
ret = gnutls_handshake (es.session);
460
fprintf(stderr, "\n*** Handshake failed ***\n");
670
467
fprintf(stderr, "Unknown error while reading data from"
671
" encrypted session with Mandos server\n");
468
" encrypted session with mandos server\n");
673
gnutls_bye(session, GNUTLS_SHUT_RDWR);
470
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
677
buffer_length += (size_t) sret;
474
buffer_length += (size_t) ret;
682
fprintf(stderr, "Closing TLS session\n");
685
gnutls_bye(session, GNUTLS_SHUT_RDWR);
687
if(buffer_length > 0){
688
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
478
if (buffer_length > 0){
479
decrypted_buffer_size = pgp_packet_decrypt(buffer,
691
if(decrypted_buffer_size >= 0){
693
while(written < (size_t) decrypted_buffer_size){
694
ret = (int)fwrite(decrypted_buffer + written, 1,
695
(size_t)decrypted_buffer_size - written,
483
if (decrypted_buffer_size >= 0){
484
while(written < decrypted_buffer_size){
485
ret = (int)fwrite (decrypted_buffer + written, 1,
486
(size_t)decrypted_buffer_size - written,
697
488
if(ret == 0 and ferror(stdout)){
699
490
fprintf(stderr, "Error writing encrypted data: %s\n",
757
553
char ip[AVAHI_ADDRESS_STR_MAX];
758
554
avahi_address_snprint(ip, sizeof(ip), address);
760
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
761
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
762
ip, (intmax_t)interface, port);
556
fprintf(stderr, "Mandos server \"%s\" found on %s (%s) on"
557
" port %d\n", name, host_name, ip, port);
764
int ret = start_mandos_communication(ip, port, interface, mc);
766
avahi_simple_poll_quit(mc->simple_poll);
559
int ret = start_mandos_communication(ip, port,
560
(unsigned int) interface);
770
566
avahi_s_service_resolver_free(r);
773
static void browse_callback(AvahiSServiceBrowser *b,
774
AvahiIfIndex interface,
775
AvahiProtocol protocol,
776
AvahiBrowserEvent event,
780
AVAHI_GCC_UNUSED AvahiLookupResultFlags
783
mandos_context *mc = userdata;
786
/* Called whenever a new services becomes available on the LAN or
787
is removed from the LAN */
791
case AVAHI_BROWSER_FAILURE:
793
fprintf(stderr, "(Avahi browser) %s\n",
794
avahi_strerror(avahi_server_errno(mc->server)));
795
avahi_simple_poll_quit(mc->simple_poll);
798
case AVAHI_BROWSER_NEW:
799
/* We ignore the returned Avahi resolver object. In the callback
800
function we free it. If the Avahi server is terminated before
801
the callback function is called the Avahi server will free the
804
if(!(avahi_s_service_resolver_new(mc->server, interface,
805
protocol, name, type, domain,
806
AVAHI_PROTO_INET6, 0,
807
resolve_callback, mc)))
808
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
809
name, avahi_strerror(avahi_server_errno(mc->server)));
812
case AVAHI_BROWSER_REMOVE:
815
case AVAHI_BROWSER_ALL_FOR_NOW:
816
case AVAHI_BROWSER_CACHE_EXHAUSTED:
818
fprintf(stderr, "No Mandos server found, still searching...\n");
569
static void browse_callback(
570
AvahiSServiceBrowser *b,
571
AvahiIfIndex interface,
572
AvahiProtocol protocol,
573
AvahiBrowserEvent event,
577
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
580
AvahiServer *s = userdata;
581
assert(b); /* Spurious warning */
583
/* Called whenever a new services becomes available on the LAN or
584
is removed from the LAN */
588
case AVAHI_BROWSER_FAILURE:
590
fprintf(stderr, "(Browser) %s\n",
591
avahi_strerror(avahi_server_errno(server)));
592
avahi_simple_poll_quit(simple_poll);
595
case AVAHI_BROWSER_NEW:
596
/* We ignore the returned resolver object. In the callback
597
function we free it. If the server is terminated before
598
the callback function is called the server will free
599
the resolver for us. */
601
if (!(avahi_s_service_resolver_new(s, interface, protocol, name,
603
AVAHI_PROTO_INET6, 0,
604
resolve_callback, s)))
605
fprintf(stderr, "Failed to resolve service '%s': %s\n", name,
606
avahi_strerror(avahi_server_errno(s)));
609
case AVAHI_BROWSER_REMOVE:
612
case AVAHI_BROWSER_ALL_FOR_NOW:
613
case AVAHI_BROWSER_CACHE_EXHAUSTED:
824
int main(int argc, char *argv[]){
825
AvahiSServiceBrowser *sb = NULL;
830
int exitcode = EXIT_SUCCESS;
831
const char *interface = "eth0";
832
struct ifreq network;
836
char *connect_to = NULL;
837
char tempdir[] = "/tmp/mandosXXXXXX";
838
bool tempdir_created = false;
839
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
840
const char *seckey = PATHDIR "/" SECKEY;
841
const char *pubkey = PATHDIR "/" PUBKEY;
843
mandos_context mc = { .simple_poll = NULL, .server = NULL,
844
.dh_bits = 1024, .priority = "SECURE256"
845
":!CTYPE-X.509:+CTYPE-OPENPGP" };
846
bool gnutls_initialized = false;
847
bool gpgme_initialized = false;
851
struct argp_option options[] = {
852
{ .name = "debug", .key = 128,
853
.doc = "Debug mode", .group = 3 },
854
{ .name = "connect", .key = 'c',
855
.arg = "ADDRESS:PORT",
856
.doc = "Connect directly to a specific Mandos server",
858
{ .name = "interface", .key = 'i',
860
.doc = "Interface that will be used to search for Mandos"
863
{ .name = "seckey", .key = 's',
865
.doc = "OpenPGP secret key file base name",
867
{ .name = "pubkey", .key = 'p',
869
.doc = "OpenPGP public key file base name",
871
{ .name = "dh-bits", .key = 129,
873
.doc = "Bit length of the prime number used in the"
874
" Diffie-Hellman key exchange",
876
{ .name = "priority", .key = 130,
878
.doc = "GnuTLS priority string for the TLS handshake",
880
{ .name = "delay", .key = 131,
882
.doc = "Maximum delay to wait for interface startup",
887
error_t parse_opt(int key, char *arg,
888
struct argp_state *state){
890
case 128: /* --debug */
893
case 'c': /* --connect */
896
case 'i': /* --interface */
899
case 's': /* --seckey */
902
case 'p': /* --pubkey */
905
case 129: /* --dh-bits */
906
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
907
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
908
or arg[numchars] != '\0'){
909
fprintf(stderr, "Bad number of DH bits\n");
912
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
914
case 130: /* --priority */
917
case 131: /* --delay */
918
ret = sscanf(arg, "%lf%n", &delay, &numchars);
919
if(ret < 1 or arg[numchars] != '\0'){
920
fprintf(stderr, "Bad delay\n");
929
return ARGP_ERR_UNKNOWN;
934
struct argp argp = { .options = options, .parser = parse_opt,
936
.doc = "Mandos client -- Get and decrypt"
937
" passwords from a Mandos server" };
938
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
939
if(ret == ARGP_ERR_UNKNOWN){
940
fprintf(stderr, "Unknown error while parsing arguments\n");
941
exitcode = EXIT_FAILURE;
946
/* If the interface is down, bring it up */
949
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
950
messages to mess up the prompt */
951
ret = klogctl(8, NULL, 5);
957
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
960
exitcode = EXIT_FAILURE;
962
ret = klogctl(7, NULL, 0);
969
strcpy(network.ifr_name, interface);
970
ret = ioctl(sd, SIOCGIFFLAGS, &network);
972
perror("ioctl SIOCGIFFLAGS");
974
ret = klogctl(7, NULL, 0);
979
exitcode = EXIT_FAILURE;
982
if((network.ifr_flags & IFF_UP) == 0){
983
network.ifr_flags |= IFF_UP;
984
ret = ioctl(sd, SIOCSIFFLAGS, &network);
986
perror("ioctl SIOCSIFFLAGS");
987
exitcode = EXIT_FAILURE;
989
ret = klogctl(7, NULL, 0);
997
/* sleep checking until interface is running */
998
for(int i=0; i < delay * 4; i++){
999
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1001
perror("ioctl SIOCGIFFLAGS");
1002
} else if(network.ifr_flags & IFF_RUNNING){
1005
struct timespec sleeptime = { .tv_nsec = 250000000 };
1006
ret = nanosleep(&sleeptime, NULL);
1007
if(ret == -1 and errno != EINTR){
1008
perror("nanosleep");
1011
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1016
/* Restores kernel loglevel to default */
1017
ret = klogctl(7, NULL, 0);
1037
ret = init_gnutls_global(&mc, pubkey, seckey);
1039
fprintf(stderr, "init_gnutls_global failed\n");
1040
exitcode = EXIT_FAILURE;
1043
gnutls_initialized = true;
1046
if(mkdtemp(tempdir) == NULL){
1050
tempdir_created = true;
1052
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
1053
fprintf(stderr, "init_gpgme failed\n");
1054
exitcode = EXIT_FAILURE;
1057
gpgme_initialized = true;
1060
if_index = (AvahiIfIndex) if_nametoindex(interface);
1062
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1063
exitcode = EXIT_FAILURE;
1067
if(connect_to != NULL){
1068
/* Connect directly, do not use Zeroconf */
1069
/* (Mainly meant for debugging) */
1070
char *address = strrchr(connect_to, ':');
1071
if(address == NULL){
1072
fprintf(stderr, "No colon in address\n");
1073
exitcode = EXIT_FAILURE;
1077
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1078
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1079
or address[numchars+1] != '\0'){
1080
fprintf(stderr, "Bad port number\n");
1081
exitcode = EXIT_FAILURE;
1084
port = (uint16_t)tmpmax;
1086
address = connect_to;
1087
ret = start_mandos_communication(address, port, if_index, &mc);
1089
exitcode = EXIT_FAILURE;
1091
exitcode = EXIT_SUCCESS;
1097
avahi_set_log_function(empty_log);
1100
/* Initialize the pseudo-RNG for Avahi */
1101
srand((unsigned int) time(NULL));
1103
/* Allocate main Avahi loop object */
1104
mc.simple_poll = avahi_simple_poll_new();
1105
if(mc.simple_poll == NULL){
1106
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1107
exitcode = EXIT_FAILURE;
618
int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
1112
619
AvahiServerConfig config;
1113
/* Do not publish any local Zeroconf records */
620
AvahiSServiceBrowser *sb = NULL;
623
int returncode = EXIT_SUCCESS;
624
const char *interface = "eth0";
627
static struct option long_options[] = {
628
{"debug", no_argument, (int *)&debug, 1},
629
{"interface", required_argument, 0, 'i'},
632
int option_index = 0;
633
ret = getopt_long (argc, argv, "i:", long_options,
652
avahi_set_log_function(empty_log);
655
/* Initialize the psuedo-RNG */
656
srand((unsigned int) time(NULL));
658
/* Allocate main loop object */
659
if (!(simple_poll = avahi_simple_poll_new())) {
660
fprintf(stderr, "Failed to create simple poll object.\n");
665
/* Do not publish any local records */
1114
666
avahi_server_config_init(&config);
1115
667
config.publish_hinfo = 0;
1116
668
config.publish_addresses = 0;
1117
669
config.publish_workstation = 0;
1118
670
config.publish_domain = 0;
1120
672
/* Allocate a new server */
1121
mc.server = avahi_server_new(avahi_simple_poll_get
1122
(mc.simple_poll), &config, NULL,
1125
/* Free the Avahi configuration data */
673
server = avahi_server_new(avahi_simple_poll_get(simple_poll),
674
&config, NULL, NULL, &error);
676
/* Free the configuration data */
1126
677
avahi_server_config_free(&config);
1129
/* Check if creating the Avahi server object succeeded */
1130
if(mc.server == NULL){
1131
fprintf(stderr, "Failed to create Avahi server: %s\n",
1132
avahi_strerror(error));
1133
exitcode = EXIT_FAILURE;
1137
/* Create the Avahi service browser */
1138
sb = avahi_s_service_browser_new(mc.server, if_index,
1139
AVAHI_PROTO_INET6, "_mandos._tcp",
1140
NULL, 0, browse_callback, &mc);
1142
fprintf(stderr, "Failed to create service browser: %s\n",
1143
avahi_strerror(avahi_server_errno(mc.server)));
1144
exitcode = EXIT_FAILURE;
1148
/* Run the main loop */
1151
fprintf(stderr, "Starting Avahi loop search\n");
1154
avahi_simple_poll_loop(mc.simple_poll);
1159
fprintf(stderr, "%s exiting\n", argv[0]);
1162
/* Cleanup things */
1164
avahi_s_service_browser_free(sb);
1166
if(mc.server != NULL)
1167
avahi_server_free(mc.server);
1169
if(mc.simple_poll != NULL)
1170
avahi_simple_poll_free(mc.simple_poll);
1172
if(gnutls_initialized){
1173
gnutls_certificate_free_credentials(mc.cred);
1174
gnutls_global_deinit();
1175
gnutls_dh_params_deinit(mc.dh_params);
1178
if(gpgme_initialized){
1179
gpgme_release(mc.ctx);
1182
/* Removes the temp directory used by GPGME */
1183
if(tempdir_created){
1185
struct dirent *direntry;
1186
d = opendir(tempdir);
1188
if(errno != ENOENT){
1193
direntry = readdir(d);
1194
if(direntry == NULL){
1197
/* Skip "." and ".." */
1198
if(direntry->d_name[0] == '.'
1199
and (direntry->d_name[1] == '\0'
1200
or (direntry->d_name[1] == '.'
1201
and direntry->d_name[2] == '\0'))){
1204
char *fullname = NULL;
1205
ret = asprintf(&fullname, "%s/%s", tempdir,
1211
ret = remove(fullname);
1213
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1220
ret = rmdir(tempdir);
1221
if(ret == -1 and errno != ENOENT){
679
/* Check if creating the server object succeeded */
681
fprintf(stderr, "Failed to create server: %s\n",
682
avahi_strerror(error));
683
returncode = EXIT_FAILURE;
687
/* Create the service browser */
688
sb = avahi_s_service_browser_new(server,
690
if_nametoindex(interface),
692
"_mandos._tcp", NULL, 0,
693
browse_callback, server);
695
fprintf(stderr, "Failed to create service browser: %s\n",
696
avahi_strerror(avahi_server_errno(server)));
697
returncode = EXIT_FAILURE;
701
/* Run the main loop */
704
fprintf(stderr, "Starting avahi loop search\n");
707
avahi_simple_poll_loop(simple_poll);
712
fprintf(stderr, "%s exiting\n", argv[0]);
717
avahi_s_service_browser_free(sb);
720
avahi_server_free(server);
723
avahi_simple_poll_free(simple_poll);