25
26
* along with this program. If not, see
26
27
* <http://www.gnu.org/licenses/>.
28
* Contact the authors at <https://www.fukt.bsnet.se/~belorn/> and
29
* <https://www.fukt.bsnet.se/~teddy/>.
29
* Contact the authors at <mandos@fukt.bsnet.se>.
32
#define _FORTIFY_SOURCE 2
32
/* Needed by GPGME, specifically gpgme_data_seek() */
34
33
#define _LARGEFILE_SOURCE
35
34
#define _FILE_OFFSET_BITS 64
41
#include <net/if.h> /* if_nametoindex */
36
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
38
#include <stdio.h> /* fprintf(), stderr, fwrite(),
40
#include <stdint.h> /* uint16_t, uint32_t */
41
#include <stddef.h> /* NULL, size_t, ssize_t */
42
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
44
#include <stdbool.h> /* bool, true */
45
#include <string.h> /* memset(), strcmp(), strlen(),
46
strerror(), asprintf(), strcpy() */
47
#include <sys/ioctl.h> /* ioctl */
48
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
49
sockaddr_in6, PF_INET6,
50
SOCK_STREAM, INET6_ADDRSTRLEN,
51
uid_t, gid_t, open(), opendir(), DIR */
52
#include <sys/stat.h> /* open() */
53
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
54
struct in6_addr, inet_pton(),
56
#include <fcntl.h> /* open() */
57
#include <dirent.h> /* opendir(), struct dirent, readdir() */
58
#include <inttypes.h> /* PRIu16 */
59
#include <assert.h> /* assert() */
60
#include <errno.h> /* perror(), errno */
61
#include <time.h> /* time() */
62
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
63
SIOCSIFFLAGS, if_indextoname(),
64
if_nametoindex(), IF_NAMESIZE */
65
#include <netinet/in.h>
66
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
67
getuid(), getgid(), setuid(),
69
#include <arpa/inet.h> /* inet_pton(), htons */
70
#include <iso646.h> /* not, and */
71
#include <argp.h> /* struct argp_option, error_t, struct
72
argp_state, struct argp,
73
argp_parse(), ARGP_KEY_ARG,
74
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
77
/* All Avahi types, constants and functions
43
80
#include <avahi-core/core.h>
44
81
#include <avahi-core/lookup.h>
45
82
#include <avahi-core/log.h>
47
84
#include <avahi-common/malloc.h>
48
85
#include <avahi-common/error.h>
51
#include <sys/types.h> /* socket(), setsockopt(),
53
#include <sys/socket.h> /* socket(), setsockopt(),
55
struct in6_addr, inet_pton() */
56
#include <gnutls/gnutls.h> /* All GnuTLS stuff */
57
#include <gnutls/openpgp.h> /* GnuTLS with openpgp stuff */
59
#include <unistd.h> /* close() */
60
#include <netinet/in.h>
61
#include <stdbool.h> /* true */
62
#include <string.h> /* memset */
63
#include <arpa/inet.h> /* inet_pton() */
64
#include <iso646.h> /* not */
67
#include <errno.h> /* perror() */
74
#define CERT_ROOT "/conf/conf.d/cryptkeyreq/"
76
#define CERTFILE CERT_ROOT "openpgp-client.txt"
77
#define KEYFILE CERT_ROOT "openpgp-client-key.txt"
88
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
91
init_gnutls_session(),
93
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
94
GNUTLS_OPENPGP_FMT_BASE64 */
97
#include <gpgme.h> /* All GPGME types, constants and
100
GPGME_PROTOCOL_OpenPGP,
78
103
#define BUFFER_SIZE 256
105
#define PATHDIR "/conf/conf.d/mandos"
106
#define SECKEY "seckey.txt"
107
#define PUBKEY "pubkey.txt"
81
109
bool debug = false;
110
static const char mandos_protocol_version[] = "1";
111
const char *argp_program_version = "mandos-client " VERSION;
112
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
114
/* Used for passing in values through the Avahi callback functions */
84
gnutls_session_t session;
116
AvahiSimplePoll *simple_poll;
85
118
gnutls_certificate_credentials_t cred;
119
unsigned int dh_bits;
86
120
gnutls_dh_params_t dh_params;
90
ssize_t pgp_packet_decrypt (char *packet, size_t packet_size,
91
char **new_packet, const char *homedir){
92
gpgme_data_t dh_crypto, dh_plain;
121
const char *priority;
126
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
127
* "buffer_capacity" is how much is currently allocated,
128
* "buffer_length" is how much is already used.
130
size_t adjustbuffer(char **buffer, size_t buffer_length,
131
size_t buffer_capacity){
132
if (buffer_length + BUFFER_SIZE > buffer_capacity){
133
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
137
buffer_capacity += BUFFER_SIZE;
139
return buffer_capacity;
145
static bool init_gpgme(mandos_context *mc, const char *seckey,
146
const char *pubkey, const char *tempdir){
96
ssize_t new_packet_capacity = 0;
97
ssize_t new_packet_length = 0;
98
149
gpgme_engine_info_t engine_info;
153
* Helper function to insert pub and seckey to the enigne keyring.
155
bool import_key(const char *filename){
157
gpgme_data_t pgp_data;
159
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
165
rc = gpgme_data_new_from_fd(&pgp_data, fd);
166
if (rc != GPG_ERR_NO_ERROR){
167
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
168
gpgme_strsource(rc), gpgme_strerror(rc));
172
rc = gpgme_op_import(mc->ctx, pgp_data);
173
if (rc != GPG_ERR_NO_ERROR){
174
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
175
gpgme_strsource(rc), gpgme_strerror(rc));
179
ret = (int)TEMP_FAILURE_RETRY(close(fd));
183
gpgme_data_release(pgp_data);
101
fprintf(stderr, "Trying to decrypt OpenPGP packet\n");
188
fprintf(stderr, "Initialize gpgme\n");
105
192
gpgme_check_version(NULL);
106
gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
193
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
194
if (rc != GPG_ERR_NO_ERROR){
195
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
196
gpgme_strsource(rc), gpgme_strerror(rc));
108
/* Set GPGME home directory */
200
/* Set GPGME home directory for the OpenPGP engine only */
109
201
rc = gpgme_get_engine_info (&engine_info);
110
202
if (rc != GPG_ERR_NO_ERROR){
111
203
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
112
204
gpgme_strsource(rc), gpgme_strerror(rc));
115
207
while(engine_info != NULL){
116
208
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
117
209
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
118
engine_info->file_name, homedir);
210
engine_info->file_name, tempdir);
121
213
engine_info = engine_info->next;
123
215
if(engine_info == NULL){
124
fprintf(stderr, "Could not set home dir to %s\n", homedir);
128
/* Create new GPGME data buffer from packet buffer */
129
rc = gpgme_data_new_from_mem(&dh_crypto, packet, packet_size, 0);
216
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
220
/* Create new GPGME "context" */
221
rc = gpgme_new(&(mc->ctx));
222
if (rc != GPG_ERR_NO_ERROR){
223
fprintf(stderr, "bad gpgme_new: %s: %s\n",
224
gpgme_strsource(rc), gpgme_strerror(rc));
228
if (not import_key(pubkey) or not import_key(seckey)){
236
* Decrypt OpenPGP data.
237
* Returns -1 on error
239
static ssize_t pgp_packet_decrypt (const mandos_context *mc,
240
const char *cryptotext,
243
gpgme_data_t dh_crypto, dh_plain;
246
size_t plaintext_capacity = 0;
247
ssize_t plaintext_length = 0;
250
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
253
/* Create new GPGME data buffer from memory cryptotext */
254
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
130
256
if (rc != GPG_ERR_NO_ERROR){
131
257
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
132
258
gpgme_strsource(rc), gpgme_strerror(rc));
138
264
if (rc != GPG_ERR_NO_ERROR){
139
265
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
140
266
gpgme_strsource(rc), gpgme_strerror(rc));
144
/* Create new GPGME "context" */
145
rc = gpgme_new(&ctx);
146
if (rc != GPG_ERR_NO_ERROR){
147
fprintf(stderr, "bad gpgme_new: %s: %s\n",
148
gpgme_strsource(rc), gpgme_strerror(rc));
152
/* Decrypt data from the FILE pointer to the plaintext data
154
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
267
gpgme_data_release(dh_crypto);
271
/* Decrypt data from the cryptotext data buffer to the plaintext
273
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
155
274
if (rc != GPG_ERR_NO_ERROR){
156
275
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
157
276
gpgme_strsource(rc), gpgme_strerror(rc));
277
plaintext_length = -1;
279
gpgme_decrypt_result_t result;
280
result = gpgme_op_decrypt_result(mc->ctx);
282
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
284
fprintf(stderr, "Unsupported algorithm: %s\n",
285
result->unsupported_algorithm);
286
fprintf(stderr, "Wrong key usage: %u\n",
287
result->wrong_key_usage);
288
if(result->file_name != NULL){
289
fprintf(stderr, "File name: %s\n", result->file_name);
291
gpgme_recipient_t recipient;
292
recipient = result->recipients;
294
while(recipient != NULL){
295
fprintf(stderr, "Public key algorithm: %s\n",
296
gpgme_pubkey_algo_name(recipient->pubkey_algo));
297
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
298
fprintf(stderr, "Secret key available: %s\n",
299
recipient->status == GPG_ERR_NO_SECKEY
301
recipient = recipient->next;
162
fprintf(stderr, "Decryption of OpenPGP packet succeeded\n");
166
gpgme_decrypt_result_t result;
167
result = gpgme_op_decrypt_result(ctx);
169
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
171
fprintf(stderr, "Unsupported algorithm: %s\n",
172
result->unsupported_algorithm);
173
fprintf(stderr, "Wrong key usage: %d\n",
174
result->wrong_key_usage);
175
if(result->file_name != NULL){
176
fprintf(stderr, "File name: %s\n", result->file_name);
178
gpgme_recipient_t recipient;
179
recipient = result->recipients;
181
while(recipient != NULL){
182
fprintf(stderr, "Public key algorithm: %s\n",
183
gpgme_pubkey_algo_name(recipient->pubkey_algo));
184
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
185
fprintf(stderr, "Secret key available: %s\n",
186
recipient->status == GPG_ERR_NO_SECKEY
188
recipient = recipient->next;
194
/* Delete the GPGME FILE pointer cryptotext data buffer */
195
gpgme_data_release(dh_crypto);
310
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
197
313
/* Seek back to the beginning of the GPGME plaintext data buffer */
198
gpgme_data_seek(dh_plain, 0, SEEK_SET);
314
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
315
perror("gpgme_data_seek");
316
plaintext_length = -1;
202
if (new_packet_length + BUFFER_SIZE > new_packet_capacity){
203
*new_packet = realloc(*new_packet,
204
(unsigned int)new_packet_capacity
206
if (*new_packet == NULL){
210
new_packet_capacity += BUFFER_SIZE;
322
plaintext_capacity = adjustbuffer(plaintext,
323
(size_t)plaintext_length,
325
if (plaintext_capacity == 0){
326
perror("adjustbuffer");
327
plaintext_length = -1;
213
ret = gpgme_data_read(dh_plain, *new_packet + new_packet_length,
331
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
215
333
/* Print the data, if any */
220
339
perror("gpgme_data_read");
223
new_packet_length += ret;
226
/* FIXME: check characters before printing to screen so to not print
227
terminal control characters */
229
/* fprintf(stderr, "decrypted password is: "); */
230
/* fwrite(*new_packet, 1, new_packet_length, stderr); */
231
/* fprintf(stderr, "\n"); */
340
plaintext_length = -1;
343
plaintext_length += ret;
347
fprintf(stderr, "Decrypted password is: ");
348
for(ssize_t i = 0; i < plaintext_length; i++){
349
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
351
fprintf(stderr, "\n");
356
/* Delete the GPGME cryptotext data buffer */
357
gpgme_data_release(dh_crypto);
234
359
/* Delete the GPGME plaintext data buffer */
235
360
gpgme_data_release(dh_plain);
236
return new_packet_length;
361
return plaintext_length;
239
364
static const char * safer_gnutls_strerror (int value) {
240
const char *ret = gnutls_strerror (value);
365
const char *ret = gnutls_strerror (value); /* Spurious warning */
242
367
ret = "(unknown)";
246
void debuggnutls(__attribute__((unused)) int level,
248
fprintf(stderr, "%s", string);
371
/* GnuTLS log function callback */
372
static void debuggnutls(__attribute__((unused)) int level,
374
fprintf(stderr, "GnuTLS: %s", string);
251
int initgnutls(encrypted_session *es){
377
static int init_gnutls_global(mandos_context *mc,
378
const char *pubkeyfilename,
379
const char *seckeyfilename){
256
383
fprintf(stderr, "Initializing GnuTLS\n");
259
if ((ret = gnutls_global_init ())
260
!= GNUTLS_E_SUCCESS) {
261
fprintf (stderr, "global_init: %s\n", safer_gnutls_strerror(ret));
386
ret = gnutls_global_init();
387
if (ret != GNUTLS_E_SUCCESS) {
388
fprintf (stderr, "GnuTLS global_init: %s\n",
389
safer_gnutls_strerror(ret));
394
/* "Use a log level over 10 to enable all debugging options."
266
397
gnutls_global_set_log_level(11);
267
398
gnutls_global_set_log_function(debuggnutls);
270
/* openpgp credentials */
271
if ((ret = gnutls_certificate_allocate_credentials (&es->cred))
272
!= GNUTLS_E_SUCCESS) {
273
fprintf (stderr, "memory error: %s\n",
401
/* OpenPGP credentials */
402
gnutls_certificate_allocate_credentials(&mc->cred);
403
if (ret != GNUTLS_E_SUCCESS){
404
fprintf (stderr, "GnuTLS memory error: %s\n", /* Spurious
274
406
safer_gnutls_strerror(ret));
407
gnutls_global_deinit ();
279
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
280
" and keyfile %s as GnuTLS credentials\n", CERTFILE,
412
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
413
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
284
417
ret = gnutls_certificate_set_openpgp_key_file
285
(es->cred, CERTFILE, KEYFILE, GNUTLS_OPENPGP_FMT_BASE64);
418
(mc->cred, pubkeyfilename, seckeyfilename,
419
GNUTLS_OPENPGP_FMT_BASE64);
286
420
if (ret != GNUTLS_E_SUCCESS) {
288
(stderr, "Error[%d] while reading the OpenPGP key pair ('%s',"
290
ret, CERTFILE, KEYFILE);
291
fprintf(stdout, "The Error is: %s\n",
422
"Error[%d] while reading the OpenPGP key pair ('%s',"
423
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
424
fprintf(stderr, "The GnuTLS error is: %s\n",
292
425
safer_gnutls_strerror(ret));
296
//GnuTLS server initialization
297
if ((ret = gnutls_dh_params_init (&es->dh_params))
298
!= GNUTLS_E_SUCCESS) {
299
fprintf (stderr, "Error in dh parameter initialization: %s\n",
300
safer_gnutls_strerror(ret));
304
if ((ret = gnutls_dh_params_generate2 (es->dh_params, DH_BITS))
305
!= GNUTLS_E_SUCCESS) {
306
fprintf (stderr, "Error in prime generation: %s\n",
307
safer_gnutls_strerror(ret));
311
gnutls_certificate_set_dh_params (es->cred, es->dh_params);
313
// GnuTLS session creation
314
if ((ret = gnutls_init (&es->session, GNUTLS_SERVER))
315
!= GNUTLS_E_SUCCESS){
429
/* GnuTLS server initialization */
430
ret = gnutls_dh_params_init(&mc->dh_params);
431
if (ret != GNUTLS_E_SUCCESS) {
432
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
433
" %s\n", safer_gnutls_strerror(ret));
436
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
437
if (ret != GNUTLS_E_SUCCESS) {
438
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
439
safer_gnutls_strerror(ret));
443
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
449
gnutls_certificate_free_credentials(mc->cred);
450
gnutls_global_deinit();
451
gnutls_dh_params_deinit(mc->dh_params);
455
static int init_gnutls_session(mandos_context *mc,
456
gnutls_session_t *session){
458
/* GnuTLS session creation */
459
ret = gnutls_init(session, GNUTLS_SERVER);
460
if (ret != GNUTLS_E_SUCCESS){
316
461
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
317
462
safer_gnutls_strerror(ret));
320
if ((ret = gnutls_priority_set_direct (es->session, "NORMAL", &err))
321
!= GNUTLS_E_SUCCESS) {
322
fprintf(stderr, "Syntax error at: %s\n", err);
323
fprintf(stderr, "GnuTLS error: %s\n",
324
safer_gnutls_strerror(ret));
467
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
468
if (ret != GNUTLS_E_SUCCESS) {
469
fprintf(stderr, "Syntax error at: %s\n", err);
470
fprintf(stderr, "GnuTLS error: %s\n",
471
safer_gnutls_strerror(ret));
472
gnutls_deinit (*session);
328
if ((ret = gnutls_credentials_set
329
(es->session, GNUTLS_CRD_CERTIFICATE, es->cred))
330
!= GNUTLS_E_SUCCESS) {
331
fprintf(stderr, "Error setting a credentials set: %s\n",
477
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
479
if (ret != GNUTLS_E_SUCCESS) {
480
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
332
481
safer_gnutls_strerror(ret));
482
gnutls_deinit (*session);
336
486
/* ignore client certificate if any. */
337
gnutls_certificate_server_set_request (es->session,
487
gnutls_certificate_server_set_request (*session,
338
488
GNUTLS_CERT_IGNORE);
340
gnutls_dh_set_prime_bits (es->session, DH_BITS);
490
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
345
void empty_log(__attribute__((unused)) AvahiLogLevel level,
346
__attribute__((unused)) const char *txt){}
495
/* Avahi log function callback */
496
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
497
__attribute__((unused)) const char *txt){}
348
int start_mandos_communication(char *ip, uint16_t port,
349
unsigned int if_index){
499
/* Called when a Mandos server is found */
500
static int start_mandos_communication(const char *ip, uint16_t port,
501
AvahiIfIndex if_index,
351
struct sockaddr_in6 to;
352
encrypted_session es;
505
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
353
506
char *buffer = NULL;
354
507
char *decrypted_buffer;
355
508
size_t buffer_length = 0;
356
509
size_t buffer_capacity = 0;
357
510
ssize_t decrypted_buffer_size;
359
513
char interface[IF_NAMESIZE];
514
gnutls_session_t session;
516
ret = init_gnutls_session (mc, &session);
362
fprintf(stderr, "Setting up a tcp connection to %s\n", ip);
522
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
365
526
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
371
if(if_indextoname(if_index, interface) == NULL){
533
if(if_indextoname((unsigned int)if_index, interface) == NULL){
373
534
perror("if_indextoname");
379
537
fprintf(stderr, "Binding to interface %s\n", interface);
382
ret = setsockopt(tcp_sd, SOL_SOCKET, SO_BINDTODEVICE, interface, 5);
384
perror("setsockopt bindtodevice");
388
memset(&to,0,sizeof(to));
389
to.sin6_family = AF_INET6;
390
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
540
memset(&to, 0, sizeof(to));
541
to.in6.sin6_family = AF_INET6;
542
/* It would be nice to have a way to detect if we were passed an
543
IPv4 address here. Now we assume an IPv6 address. */
544
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
392
546
perror("inet_pton");
396
550
fprintf(stderr, "Bad address: %s\n", ip);
399
/* Spurious warnings for the next line, see for instance
400
<http://bugs.debian.org/488884> */
401
to.sin6_port = htons(port);
553
to.in6.sin6_port = htons(port); /* Spurious warning */
403
to.sin6_scope_id = (uint32_t)if_index;
555
to.in6.sin6_scope_id = (uint32_t)if_index;
406
fprintf(stderr, "Connection to: %s\n", ip);
558
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
560
char addrstr[INET6_ADDRSTRLEN] = "";
561
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
562
sizeof(addrstr)) == NULL){
565
if(strcmp(addrstr, ip) != 0){
566
fprintf(stderr, "Canonical address form: %s\n", addrstr);
409
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
571
ret = connect(tcp_sd, &to.in, sizeof(to));
411
573
perror("connect");
415
ret = initgnutls (&es);
577
const char *out = mandos_protocol_version;
580
size_t out_size = strlen(out);
581
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
582
out_size - written));
588
written += (size_t)ret;
589
if(written < out_size){
592
if (out == mandos_protocol_version){
421
gnutls_transport_set_ptr (es.session,
422
(gnutls_transport_ptr_t) tcp_sd);
425
602
fprintf(stderr, "Establishing TLS session with %s\n", ip);
428
ret = gnutls_handshake (es.session);
605
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
608
ret = gnutls_handshake (session);
609
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
430
611
if (ret != GNUTLS_E_SUCCESS){
431
fprintf(stderr, "\n*** Handshake failed ***\n");
613
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
437
//Retrieve OpenPGP packet that contains the wanted password
620
/* Read OpenPGP packet that contains the wanted password */
440
623
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
445
if (buffer_length + BUFFER_SIZE > buffer_capacity){
446
buffer = realloc(buffer, buffer_capacity + BUFFER_SIZE);
451
buffer_capacity += BUFFER_SIZE;
628
buffer_capacity = adjustbuffer(&buffer, buffer_length,
630
if (buffer_capacity == 0){
631
perror("adjustbuffer");
454
ret = gnutls_record_recv
455
(es.session, buffer+buffer_length, BUFFER_SIZE);
636
sret = gnutls_record_recv(session, buffer+buffer_length,
461
643
case GNUTLS_E_INTERRUPTED:
462
644
case GNUTLS_E_AGAIN:
464
646
case GNUTLS_E_REHANDSHAKE:
465
ret = gnutls_handshake (es.session);
648
ret = gnutls_handshake (session);
649
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
467
fprintf(stderr, "\n*** Handshake failed ***\n");
651
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
468
652
gnutls_perror (ret);
474
658
fprintf(stderr, "Unknown error while reading data from"
475
" encrypted session with mandos server\n");
659
" encrypted session with Mandos server\n");
477
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
661
gnutls_bye (session, GNUTLS_SHUT_RDWR);
481
buffer_length += (size_t) ret;
665
buffer_length += (size_t) sret;
670
fprintf(stderr, "Closing TLS session\n");
673
gnutls_bye (session, GNUTLS_SHUT_RDWR);
485
675
if (buffer_length > 0){
486
decrypted_buffer_size = pgp_packet_decrypt(buffer,
676
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
490
679
if (decrypted_buffer_size >= 0){
491
while(decrypted_buffer_size > 0){
492
ret = fwrite (decrypted_buffer, 1, (size_t)decrypted_buffer_size,
681
while(written < (size_t) decrypted_buffer_size){
682
ret = (int)fwrite (decrypted_buffer + written, 1,
683
(size_t)decrypted_buffer_size - written,
494
685
if(ret == 0 and ferror(stdout)){
496
687
fprintf(stderr, "Error writing encrypted data: %s\n",
502
decrypted_buffer += ret;
503
decrypted_buffer_size -= ret;
693
written += (size_t)ret;
505
695
free(decrypted_buffer);
514
fprintf(stderr, "Closing TLS session\n");
703
/* Shutdown procedure */
518
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
521
gnutls_deinit (es.session);
522
gnutls_certificate_free_credentials (es.cred);
523
gnutls_global_deinit ();
707
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
711
gnutls_deinit (session);
527
static AvahiSimplePoll *simple_poll = NULL;
528
static AvahiServer *server = NULL;
530
static void resolve_callback(
531
AvahiSServiceResolver *r,
532
AVAHI_GCC_UNUSED AvahiIfIndex interface,
533
AVAHI_GCC_UNUSED AvahiProtocol protocol,
534
AvahiResolverEvent event,
538
const char *host_name,
539
const AvahiAddress *address,
541
AVAHI_GCC_UNUSED AvahiStringList *txt,
542
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
543
AVAHI_GCC_UNUSED void* userdata) {
715
static void resolve_callback(AvahiSServiceResolver *r,
716
AvahiIfIndex interface,
717
AVAHI_GCC_UNUSED AvahiProtocol protocol,
718
AvahiResolverEvent event,
722
const char *host_name,
723
const AvahiAddress *address,
725
AVAHI_GCC_UNUSED AvahiStringList *txt,
726
AVAHI_GCC_UNUSED AvahiLookupResultFlags
729
mandos_context *mc = userdata;
547
732
/* Called whenever a service has been resolved successfully or
552
737
case AVAHI_RESOLVER_FAILURE:
553
fprintf(stderr, "(Resolver) Failed to resolve service '%s' of"
554
" type '%s' in domain '%s': %s\n", name, type, domain,
555
avahi_strerror(avahi_server_errno(server)));
738
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
739
" of type '%s' in domain '%s': %s\n", name, type, domain,
740
avahi_strerror(avahi_server_errno(mc->server)));
558
743
case AVAHI_RESOLVER_FOUND:
560
745
char ip[AVAHI_ADDRESS_STR_MAX];
561
746
avahi_address_snprint(ip, sizeof(ip), address);
563
fprintf(stderr, "Mandos server found on %s (%s) on port %d\n",
564
host_name, ip, port);
748
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
749
PRIu16 ") on port %d\n", name, host_name, ip,
566
int ret = start_mandos_communication(ip, port,
752
int ret = start_mandos_communication(ip, port, interface, mc);
754
avahi_simple_poll_quit(mc->simple_poll);
576
758
avahi_s_service_resolver_free(r);
579
static void browse_callback(
580
AvahiSServiceBrowser *b,
581
AvahiIfIndex interface,
582
AvahiProtocol protocol,
583
AvahiBrowserEvent event,
587
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
590
AvahiServer *s = userdata;
593
/* Called whenever a new services becomes available on the LAN or
594
is removed from the LAN */
598
case AVAHI_BROWSER_FAILURE:
600
fprintf(stderr, "(Browser) %s\n",
601
avahi_strerror(avahi_server_errno(server)));
602
avahi_simple_poll_quit(simple_poll);
605
case AVAHI_BROWSER_NEW:
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. */
611
if (!(avahi_s_service_resolver_new(s, interface, protocol, name,
613
AVAHI_PROTO_INET6, 0,
614
resolve_callback, s)))
615
fprintf(stderr, "Failed to resolve service '%s': %s\n", name,
616
avahi_strerror(avahi_server_errno(s)));
619
case AVAHI_BROWSER_REMOVE:
622
case AVAHI_BROWSER_ALL_FOR_NOW:
623
case AVAHI_BROWSER_CACHE_EXHAUSTED:
761
static void browse_callback( AvahiSServiceBrowser *b,
762
AvahiIfIndex interface,
763
AvahiProtocol protocol,
764
AvahiBrowserEvent event,
768
AVAHI_GCC_UNUSED AvahiLookupResultFlags
771
mandos_context *mc = userdata;
774
/* Called whenever a new services becomes available on the LAN or
775
is removed from the LAN */
779
case AVAHI_BROWSER_FAILURE:
781
fprintf(stderr, "(Avahi browser) %s\n",
782
avahi_strerror(avahi_server_errno(mc->server)));
783
avahi_simple_poll_quit(mc->simple_poll);
786
case AVAHI_BROWSER_NEW:
787
/* We ignore the returned Avahi resolver object. In the callback
788
function we free it. If the Avahi server is terminated before
789
the callback function is called the Avahi server will free the
792
if (!(avahi_s_service_resolver_new(mc->server, interface,
793
protocol, name, type, domain,
794
AVAHI_PROTO_INET6, 0,
795
resolve_callback, mc)))
796
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
797
name, avahi_strerror(avahi_server_errno(mc->server)));
800
case AVAHI_BROWSER_REMOVE:
803
case AVAHI_BROWSER_ALL_FOR_NOW:
804
case AVAHI_BROWSER_CACHE_EXHAUSTED:
806
fprintf(stderr, "No Mandos server found, still searching...\n");
628
int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
629
AvahiServerConfig config;
812
int main(int argc, char *argv[]){
630
813
AvahiSServiceBrowser *sb = NULL;
633
int returncode = EXIT_SUCCESS;
816
int exitcode = EXIT_SUCCESS;
634
817
const char *interface = "eth0";
637
static struct option long_options[] = {
638
{"debug", no_argument, (int *)&debug, 1},
639
{"interface", required_argument, 0, 'i'},
642
int option_index = 0;
643
ret = getopt_long (argc, argv, "i:", long_options,
818
struct ifreq network;
822
char *connect_to = NULL;
823
char tempdir[] = "/tmp/mandosXXXXXX";
824
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
825
const char *seckey = PATHDIR "/" SECKEY;
826
const char *pubkey = PATHDIR "/" PUBKEY;
828
mandos_context mc = { .simple_poll = NULL, .server = NULL,
829
.dh_bits = 1024, .priority = "SECURE256"
830
":!CTYPE-X.509:+CTYPE-OPENPGP" };
831
bool gnutls_initalized = false;
832
bool gpgme_initalized = false;
835
struct argp_option options[] = {
836
{ .name = "debug", .key = 128,
837
.doc = "Debug mode", .group = 3 },
838
{ .name = "connect", .key = 'c',
839
.arg = "ADDRESS:PORT",
840
.doc = "Connect directly to a specific Mandos server",
842
{ .name = "interface", .key = 'i',
844
.doc = "Interface that will be used to search for Mandos"
847
{ .name = "seckey", .key = 's',
849
.doc = "OpenPGP secret key file base name",
851
{ .name = "pubkey", .key = 'p',
853
.doc = "OpenPGP public key file base name",
855
{ .name = "dh-bits", .key = 129,
857
.doc = "Bit length of the prime number used in the"
858
" Diffie-Hellman key exchange",
860
{ .name = "priority", .key = 130,
862
.doc = "GnuTLS priority string for the TLS handshake",
867
error_t parse_opt (int key, char *arg,
868
struct argp_state *state) {
869
/* Get the INPUT argument from `argp_parse', which we know is
870
a pointer to our plugin list pointer. */
872
case 128: /* --debug */
875
case 'c': /* --connect */
878
case 'i': /* --interface */
881
case 's': /* --seckey */
884
case 'p': /* --pubkey */
887
case 129: /* --dh-bits */
889
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
895
case 130: /* --priority */
903
return ARGP_ERR_UNKNOWN;
908
struct argp argp = { .options = options, .parser = parse_opt,
910
.doc = "Mandos client -- Get and decrypt"
911
" passwords from a Mandos server" };
912
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
913
if (ret == ARGP_ERR_UNKNOWN){
914
fprintf(stderr, "Unknown error while parsing arguments\n");
915
exitcode = EXIT_FAILURE;
920
/* If the interface is down, bring it up */
922
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
925
exitcode = EXIT_FAILURE;
928
strcpy(network.ifr_name, interface);
929
ret = ioctl(sd, SIOCGIFFLAGS, &network);
931
perror("ioctl SIOCGIFFLAGS");
932
exitcode = EXIT_FAILURE;
935
if((network.ifr_flags & IFF_UP) == 0){
936
network.ifr_flags |= IFF_UP;
937
ret = ioctl(sd, SIOCSIFFLAGS, &network);
939
perror("ioctl SIOCSIFFLAGS");
940
exitcode = EXIT_FAILURE;
944
ret = (int)TEMP_FAILURE_RETRY(close(sd));
963
ret = init_gnutls_global(&mc, pubkey, seckey);
965
fprintf(stderr, "init_gnutls_global failed\n");
966
exitcode = EXIT_FAILURE;
969
gnutls_initalized = true;
972
if(mkdtemp(tempdir) == NULL){
978
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
979
fprintf(stderr, "gpgme_initalized failed\n");
980
exitcode = EXIT_FAILURE;
983
gpgme_initalized = true;
986
if_index = (AvahiIfIndex) if_nametoindex(interface);
988
fprintf(stderr, "No such interface: \"%s\"\n", interface);
992
if(connect_to != NULL){
993
/* Connect directly, do not use Zeroconf */
994
/* (Mainly meant for debugging) */
995
char *address = strrchr(connect_to, ':');
997
fprintf(stderr, "No colon in address\n");
998
exitcode = EXIT_FAILURE;
1002
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
1004
perror("Bad port number");
1005
exitcode = EXIT_FAILURE;
1009
address = connect_to;
1010
ret = start_mandos_communication(address, port, if_index, &mc);
1012
exitcode = EXIT_FAILURE;
1014
exitcode = EXIT_SUCCESS;
662
1020
avahi_set_log_function(empty_log);
665
/* Initialize the psuedo-RNG */
1023
/* Initialize the pseudo-RNG for Avahi */
666
1024
srand((unsigned int) time(NULL));
668
/* Allocate main loop object */
669
if (!(simple_poll = avahi_simple_poll_new())) {
670
fprintf(stderr, "Failed to create simple poll object.\n");
675
/* Do not publish any local records */
676
avahi_server_config_init(&config);
677
config.publish_hinfo = 0;
678
config.publish_addresses = 0;
679
config.publish_workstation = 0;
680
config.publish_domain = 0;
682
/* Allocate a new server */
683
server = avahi_server_new(avahi_simple_poll_get(simple_poll),
684
&config, NULL, NULL, &error);
686
/* Free the configuration data */
687
avahi_server_config_free(&config);
689
/* Check if creating the server object succeeded */
691
fprintf(stderr, "Failed to create server: %s\n",
1026
/* Allocate main Avahi loop object */
1027
mc.simple_poll = avahi_simple_poll_new();
1028
if (mc.simple_poll == NULL) {
1029
fprintf(stderr, "Avahi: Failed to create simple poll"
1031
exitcode = EXIT_FAILURE;
1036
AvahiServerConfig config;
1037
/* Do not publish any local Zeroconf records */
1038
avahi_server_config_init(&config);
1039
config.publish_hinfo = 0;
1040
config.publish_addresses = 0;
1041
config.publish_workstation = 0;
1042
config.publish_domain = 0;
1044
/* Allocate a new server */
1045
mc.server = avahi_server_new(avahi_simple_poll_get
1046
(mc.simple_poll), &config, NULL,
1049
/* Free the Avahi configuration data */
1050
avahi_server_config_free(&config);
1053
/* Check if creating the Avahi server object succeeded */
1054
if (mc.server == NULL) {
1055
fprintf(stderr, "Failed to create Avahi server: %s\n",
692
1056
avahi_strerror(error));
693
returncode = EXIT_FAILURE;
1057
exitcode = EXIT_FAILURE;
697
/* Create the service browser */
698
sb = avahi_s_service_browser_new(server,
700
if_nametoindex(interface),
1061
/* Create the Avahi service browser */
1062
sb = avahi_s_service_browser_new(mc.server, if_index,
701
1063
AVAHI_PROTO_INET6,
702
1064
"_mandos._tcp", NULL, 0,
703
browse_callback, server);
1065
browse_callback, &mc);
705
1067
fprintf(stderr, "Failed to create service browser: %s\n",
706
avahi_strerror(avahi_server_errno(server)));
707
returncode = EXIT_FAILURE;
1068
avahi_strerror(avahi_server_errno(mc.server)));
1069
exitcode = EXIT_FAILURE;
711
1073
/* Run the main loop */
714
fprintf(stderr, "Starting avahi loop search\n");
1076
fprintf(stderr, "Starting Avahi loop search\n");
717
avahi_simple_poll_loop(simple_poll);
1079
avahi_simple_poll_loop(mc.simple_poll);
722
1084
fprintf(stderr, "%s exiting\n", argv[0]);
725
1087
/* Cleanup things */
727
1089
avahi_s_service_browser_free(sb);
730
avahi_server_free(server);
733
avahi_simple_poll_free(simple_poll);
1091
if (mc.server != NULL)
1092
avahi_server_free(mc.server);
1094
if (mc.simple_poll != NULL)
1095
avahi_simple_poll_free(mc.simple_poll);
1097
if (gnutls_initalized){
1098
gnutls_certificate_free_credentials(mc.cred);
1099
gnutls_global_deinit ();
1100
gnutls_dh_params_deinit(mc.dh_params);
1103
if(gpgme_initalized){
1104
gpgme_release(mc.ctx);
1107
/* Removes the temp directory used by GPGME */
1108
if(tempdir[0] != '\0'){
1110
struct dirent *direntry;
1111
d = opendir(tempdir);
1116
direntry = readdir(d);
1117
if(direntry == NULL){
1120
if (direntry->d_type == DT_REG){
1121
char *fullname = NULL;
1122
ret = asprintf(&fullname, "%s/%s", tempdir,
1128
ret = unlink(fullname);
1130
fprintf(stderr, "unlink(\"%s\"): %s",
1131
fullname, strerror(errno));
1138
ret = rmdir(tempdir);