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
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
33
#define _LARGEFILE_SOURCE
34
34
#define _FILE_OFFSET_BITS 64
40
#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
42
80
#include <avahi-core/core.h>
43
81
#include <avahi-core/lookup.h>
44
82
#include <avahi-core/log.h>
46
84
#include <avahi-common/malloc.h>
47
85
#include <avahi-common/error.h>
50
#include <sys/types.h> /* socket(), inet_pton() */
51
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
52
struct in6_addr, inet_pton() */
53
#include <gnutls/gnutls.h> /* All GnuTLS stuff */
54
#include <gnutls/openpgp.h> /* GnuTLS with openpgp stuff */
56
#include <unistd.h> /* close() */
57
#include <netinet/in.h>
58
#include <stdbool.h> /* true */
59
#include <string.h> /* memset */
60
#include <arpa/inet.h> /* inet_pton() */
61
#include <iso646.h> /* not */
64
#include <errno.h> /* perror() */
71
#define CERT_ROOT "/conf/conf.d/cryptkeyreq/"
73
#define CERTFILE CERT_ROOT "openpgp-client.txt"
74
#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,
75
103
#define BUFFER_SIZE 256
105
#define PATHDIR "/conf/conf.d/mandos"
106
#define SECKEY "seckey.txt"
107
#define PUBKEY "pubkey.txt"
78
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 */
81
gnutls_session_t session;
116
AvahiSimplePoll *simple_poll;
82
118
gnutls_certificate_credentials_t cred;
119
unsigned int dh_bits;
83
120
gnutls_dh_params_t dh_params;
87
ssize_t pgp_packet_decrypt (char *packet, size_t packet_size,
88
char **new_packet, const char *homedir){
89
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){
93
ssize_t new_packet_capacity = 0;
94
ssize_t new_packet_length = 0;
95
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 = 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 = TEMP_FAILURE_RETRY(close(fd));
183
gpgme_data_release(pgp_data);
98
fprintf(stderr, "Trying to decrypt OpenPGP packet\n");
188
fprintf(stderr, "Initialize gpgme\n");
102
192
gpgme_check_version(NULL);
103
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));
105
/* Set GPGME home directory */
200
/* Set GPGME home directory for the OpenPGP engine only */
106
201
rc = gpgme_get_engine_info (&engine_info);
107
202
if (rc != GPG_ERR_NO_ERROR){
108
203
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
109
204
gpgme_strsource(rc), gpgme_strerror(rc));
112
207
while(engine_info != NULL){
113
208
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
114
209
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
115
engine_info->file_name, homedir);
210
engine_info->file_name, tempdir);
118
213
engine_info = engine_info->next;
120
215
if(engine_info == NULL){
121
fprintf(stderr, "Could not set home dir to %s\n", homedir);
125
/* Create new GPGME data buffer from packet buffer */
126
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,
127
256
if (rc != GPG_ERR_NO_ERROR){
128
257
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
129
258
gpgme_strsource(rc), gpgme_strerror(rc));
135
264
if (rc != GPG_ERR_NO_ERROR){
136
265
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
137
266
gpgme_strsource(rc), gpgme_strerror(rc));
141
/* Create new GPGME "context" */
142
rc = gpgme_new(&ctx);
143
if (rc != GPG_ERR_NO_ERROR){
144
fprintf(stderr, "bad gpgme_new: %s: %s\n",
145
gpgme_strsource(rc), gpgme_strerror(rc));
149
/* Decrypt data from the FILE pointer to the plaintext data
151
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);
152
274
if (rc != GPG_ERR_NO_ERROR){
153
275
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
154
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;
159
fprintf(stderr, "Decryption of OpenPGP packet succeeded\n");
163
gpgme_decrypt_result_t result;
164
result = gpgme_op_decrypt_result(ctx);
166
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
168
fprintf(stderr, "Unsupported algorithm: %s\n",
169
result->unsupported_algorithm);
170
fprintf(stderr, "Wrong key usage: %d\n",
171
result->wrong_key_usage);
172
if(result->file_name != NULL){
173
fprintf(stderr, "File name: %s\n", result->file_name);
175
gpgme_recipient_t recipient;
176
recipient = result->recipients;
178
while(recipient != NULL){
179
fprintf(stderr, "Public key algorithm: %s\n",
180
gpgme_pubkey_algo_name(recipient->pubkey_algo));
181
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
182
fprintf(stderr, "Secret key available: %s\n",
183
recipient->status == GPG_ERR_NO_SECKEY
185
recipient = recipient->next;
191
/* Delete the GPGME FILE pointer cryptotext data buffer */
192
gpgme_data_release(dh_crypto);
310
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
194
313
/* Seek back to the beginning of the GPGME plaintext data buffer */
195
gpgme_data_seek(dh_plain, (off_t) 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;
199
if (new_packet_length + BUFFER_SIZE > new_packet_capacity){
200
*new_packet = realloc(*new_packet,
201
(unsigned int)new_packet_capacity
203
if (*new_packet == NULL){
207
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;
210
ret = gpgme_data_read(dh_plain, *new_packet + new_packet_length,
331
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
212
333
/* Print the data, if any */
217
339
perror("gpgme_data_read");
220
new_packet_length += ret;
223
/* FIXME: check characters before printing to screen so to not print
224
terminal control characters */
226
/* fprintf(stderr, "decrypted password is: "); */
227
/* fwrite(*new_packet, 1, new_packet_length, stderr); */
228
/* 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);
231
359
/* Delete the GPGME plaintext data buffer */
232
360
gpgme_data_release(dh_plain);
233
return new_packet_length;
361
return plaintext_length;
236
364
static const char * safer_gnutls_strerror (int value) {
237
const char *ret = gnutls_strerror (value);
365
const char *ret = gnutls_strerror (value); /* Spurious warning */
239
367
ret = "(unknown)";
243
void debuggnutls(__attribute__((unused)) int level,
245
fprintf(stderr, "%s", string);
371
/* GnuTLS log function callback */
372
static void debuggnutls(__attribute__((unused)) int level,
374
fprintf(stderr, "GnuTLS: %s", string);
248
int initgnutls(encrypted_session *es){
377
static int init_gnutls_global(mandos_context *mc,
378
const char *pubkeyfilename,
379
const char *seckeyfilename){
253
383
fprintf(stderr, "Initializing GnuTLS\n");
256
if ((ret = gnutls_global_init ())
257
!= GNUTLS_E_SUCCESS) {
258
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."
263
397
gnutls_global_set_log_level(11);
264
398
gnutls_global_set_log_function(debuggnutls);
267
/* openpgp credentials */
268
if ((ret = gnutls_certificate_allocate_credentials (&es->cred))
269
!= GNUTLS_E_SUCCESS) {
270
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
271
406
safer_gnutls_strerror(ret));
407
gnutls_global_deinit ();
276
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
277
" 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,
281
417
ret = gnutls_certificate_set_openpgp_key_file
282
(es->cred, CERTFILE, KEYFILE, GNUTLS_OPENPGP_FMT_BASE64);
418
(mc->cred, pubkeyfilename, seckeyfilename,
419
GNUTLS_OPENPGP_FMT_BASE64);
283
420
if (ret != GNUTLS_E_SUCCESS) {
285
(stderr, "Error[%d] while reading the OpenPGP key pair ('%s',"
287
ret, CERTFILE, KEYFILE);
288
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",
289
425
safer_gnutls_strerror(ret));
293
//GnuTLS server initialization
294
if ((ret = gnutls_dh_params_init (&es->dh_params))
295
!= GNUTLS_E_SUCCESS) {
296
fprintf (stderr, "Error in dh parameter initialization: %s\n",
297
safer_gnutls_strerror(ret));
301
if ((ret = gnutls_dh_params_generate2 (es->dh_params, DH_BITS))
302
!= GNUTLS_E_SUCCESS) {
303
fprintf (stderr, "Error in prime generation: %s\n",
304
safer_gnutls_strerror(ret));
308
gnutls_certificate_set_dh_params (es->cred, es->dh_params);
310
// GnuTLS session creation
311
if ((ret = gnutls_init (&es->session, GNUTLS_SERVER))
312
!= 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){
313
461
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
314
462
safer_gnutls_strerror(ret));
317
if ((ret = gnutls_priority_set_direct (es->session, "NORMAL", &err))
318
!= GNUTLS_E_SUCCESS) {
319
fprintf(stderr, "Syntax error at: %s\n", err);
320
fprintf(stderr, "GnuTLS error: %s\n",
321
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);
325
if ((ret = gnutls_credentials_set
326
(es->session, GNUTLS_CRD_CERTIFICATE, es->cred))
327
!= GNUTLS_E_SUCCESS) {
328
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",
329
481
safer_gnutls_strerror(ret));
482
gnutls_deinit (*session);
333
486
/* ignore client certificate if any. */
334
gnutls_certificate_server_set_request (es->session,
487
gnutls_certificate_server_set_request (*session,
335
488
GNUTLS_CERT_IGNORE);
337
gnutls_dh_set_prime_bits (es->session, DH_BITS);
490
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
342
void empty_log(__attribute__((unused)) AvahiLogLevel level,
343
__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){}
345
int start_mandos_communication(const char *ip, uint16_t port,
346
AvahiIfIndex 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,
348
struct sockaddr_in6 to;
349
encrypted_session es;
504
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
350
505
char *buffer = NULL;
351
506
char *decrypted_buffer;
352
507
size_t buffer_length = 0;
353
508
size_t buffer_capacity = 0;
354
509
ssize_t decrypted_buffer_size;
357
512
char interface[IF_NAMESIZE];
513
gnutls_session_t session;
515
ret = init_gnutls_session (mc, &session);
360
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
521
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
364
525
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
370
if(if_indextoname((unsigned int)if_index, interface) == NULL){
532
if(if_indextoname((unsigned int)if_index, interface) == NULL){
372
533
perror("if_indextoname");
378
536
fprintf(stderr, "Binding to interface %s\n", interface);
381
memset(&to,0,sizeof(to)); /* Spurious warning */
382
to.sin6_family = AF_INET6;
383
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
539
memset(&to, 0, sizeof(to));
540
to.in6.sin6_family = AF_INET6;
541
/* It would be nice to have a way to detect if we were passed an
542
IPv4 address here. Now we assume an IPv6 address. */
543
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
385
545
perror("inet_pton");
389
549
fprintf(stderr, "Bad address: %s\n", ip);
392
to.sin6_port = htons(port); /* Spurious warning */
552
to.in6.sin6_port = htons(port); /* Spurious warning */
394
to.sin6_scope_id = (uint32_t)if_index;
554
to.in6.sin6_scope_id = (uint32_t)if_index;
397
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
398
/* char addrstr[INET6_ADDRSTRLEN]; */
399
/* if(inet_ntop(to.sin6_family, &(to.sin6_addr), addrstr, */
400
/* sizeof(addrstr)) == NULL){ */
401
/* perror("inet_ntop"); */
403
/* fprintf(stderr, "Really connecting to: %s, port %d\n", */
404
/* addrstr, ntohs(to.sin6_port)); */
557
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
559
char addrstr[INET6_ADDRSTRLEN] = "";
560
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
561
sizeof(addrstr)) == NULL){
564
if(strcmp(addrstr, ip) != 0){
565
fprintf(stderr, "Canonical address form: %s\n", addrstr);
408
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
570
ret = connect(tcp_sd, &to.in, sizeof(to));
410
572
perror("connect");
414
ret = initgnutls (&es);
576
const char *out = mandos_protocol_version;
579
size_t out_size = strlen(out);
580
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
581
out_size - written));
587
written += (size_t)ret;
588
if(written < out_size){
591
if (out == mandos_protocol_version){
420
gnutls_transport_set_ptr (es.session,
421
(gnutls_transport_ptr_t) tcp_sd);
424
601
fprintf(stderr, "Establishing TLS session with %s\n", ip);
427
ret = gnutls_handshake (es.session);
604
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
607
ret = gnutls_handshake (session);
608
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
429
610
if (ret != GNUTLS_E_SUCCESS){
431
fprintf(stderr, "\n*** Handshake failed ***\n");
612
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
432
613
gnutls_perror (ret);
438
//Retrieve OpenPGP packet that contains the wanted password
619
/* Read OpenPGP packet that contains the wanted password */
441
622
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
446
if (buffer_length + BUFFER_SIZE > buffer_capacity){
447
buffer = realloc(buffer, buffer_capacity + BUFFER_SIZE);
452
buffer_capacity += BUFFER_SIZE;
627
buffer_capacity = adjustbuffer(&buffer, buffer_length,
629
if (buffer_capacity == 0){
630
perror("adjustbuffer");
455
ret = gnutls_record_recv
456
(es.session, buffer+buffer_length, BUFFER_SIZE);
635
ret = gnutls_record_recv(session, buffer+buffer_length,
561
744
char ip[AVAHI_ADDRESS_STR_MAX];
562
745
avahi_address_snprint(ip, sizeof(ip), address);
564
fprintf(stderr, "Mandos server \"%s\" found on %s (%s) on"
565
" port %d\n", name, host_name, ip, port);
747
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
748
PRIu16 ") on port %d\n", name, host_name, ip,
567
int ret = start_mandos_communication(ip, port, interface);
751
int ret = start_mandos_communication(ip, port, interface, mc);
753
avahi_simple_poll_quit(mc->simple_poll);
573
757
avahi_s_service_resolver_free(r);
576
static void browse_callback(
577
AvahiSServiceBrowser *b,
578
AvahiIfIndex interface,
579
AvahiProtocol protocol,
580
AvahiBrowserEvent event,
584
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
587
AvahiServer *s = userdata;
588
assert(b); /* Spurious warning */
590
/* Called whenever a new services becomes available on the LAN or
591
is removed from the LAN */
595
case AVAHI_BROWSER_FAILURE:
597
fprintf(stderr, "(Browser) %s\n",
598
avahi_strerror(avahi_server_errno(server)));
599
avahi_simple_poll_quit(simple_poll);
602
case AVAHI_BROWSER_NEW:
603
/* We ignore the returned resolver object. In the callback
604
function we free it. If the server is terminated before
605
the callback function is called the server will free
606
the resolver for us. */
608
if (!(avahi_s_service_resolver_new(s, interface, protocol, name,
610
AVAHI_PROTO_INET6, 0,
611
resolve_callback, s)))
612
fprintf(stderr, "Failed to resolve service '%s': %s\n", name,
613
avahi_strerror(avahi_server_errno(s)));
616
case AVAHI_BROWSER_REMOVE:
619
case AVAHI_BROWSER_ALL_FOR_NOW:
620
case AVAHI_BROWSER_CACHE_EXHAUSTED:
760
static void browse_callback( AvahiSServiceBrowser *b,
761
AvahiIfIndex interface,
762
AvahiProtocol protocol,
763
AvahiBrowserEvent event,
767
AVAHI_GCC_UNUSED AvahiLookupResultFlags
770
mandos_context *mc = userdata;
773
/* Called whenever a new services becomes available on the LAN or
774
is removed from the LAN */
778
case AVAHI_BROWSER_FAILURE:
780
fprintf(stderr, "(Avahi browser) %s\n",
781
avahi_strerror(avahi_server_errno(mc->server)));
782
avahi_simple_poll_quit(mc->simple_poll);
785
case AVAHI_BROWSER_NEW:
786
/* We ignore the returned Avahi resolver object. In the callback
787
function we free it. If the Avahi server is terminated before
788
the callback function is called the Avahi server will free the
791
if (!(avahi_s_service_resolver_new(mc->server, interface,
792
protocol, name, type, domain,
793
AVAHI_PROTO_INET6, 0,
794
resolve_callback, mc)))
795
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
796
name, avahi_strerror(avahi_server_errno(mc->server)));
799
case AVAHI_BROWSER_REMOVE:
802
case AVAHI_BROWSER_ALL_FOR_NOW:
803
case AVAHI_BROWSER_CACHE_EXHAUSTED:
805
fprintf(stderr, "No Mandos server found, still searching...\n");
625
int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
626
AvahiServerConfig config;
811
int main(int argc, char *argv[]){
627
812
AvahiSServiceBrowser *sb = NULL;
630
int returncode = EXIT_SUCCESS;
631
const char *interface = NULL;
815
int exitcode = EXIT_SUCCESS;
816
const char *interface = "eth0";
817
struct ifreq network;
821
char *connect_to = NULL;
822
char tempdir[] = "/tmp/mandosXXXXXX";
632
823
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
633
char *connect_to = NULL;
636
static struct option long_options[] = {
637
{"debug", no_argument, (int *)&debug, 1},
638
{"connect", required_argument, 0, 'c'},
639
{"interface", required_argument, 0, 'i'},
642
int option_index = 0;
643
ret = getopt_long (argc, argv, "i:", long_options,
664
if(interface != NULL){
665
if_index = (AvahiIfIndex) if_nametoindex(interface);
667
fprintf(stderr, "No such interface: \"%s\"\n", interface);
824
const char *seckey = PATHDIR "/" SECKEY;
825
const char *pubkey = PATHDIR "/" PUBKEY;
827
mandos_context mc = { .simple_poll = NULL, .server = NULL,
828
.dh_bits = 1024, .priority = "SECURE256"
829
":!CTYPE-X.509:+CTYPE-OPENPGP" };
830
bool gnutls_initalized = false;
831
bool gpgme_initalized = false;
834
struct argp_option options[] = {
835
{ .name = "debug", .key = 128,
836
.doc = "Debug mode", .group = 3 },
837
{ .name = "connect", .key = 'c',
838
.arg = "ADDRESS:PORT",
839
.doc = "Connect directly to a specific Mandos server",
841
{ .name = "interface", .key = 'i',
843
.doc = "Interface that will be used to search for Mandos"
846
{ .name = "seckey", .key = 's',
848
.doc = "OpenPGP secret key file base name",
850
{ .name = "pubkey", .key = 'p',
852
.doc = "OpenPGP public key file base name",
854
{ .name = "dh-bits", .key = 129,
856
.doc = "Bit length of the prime number used in the"
857
" Diffie-Hellman key exchange",
859
{ .name = "priority", .key = 130,
861
.doc = "GnuTLS priority string for the TLS handshake",
866
error_t parse_opt (int key, char *arg,
867
struct argp_state *state) {
868
/* Get the INPUT argument from `argp_parse', which we know is
869
a pointer to our plugin list pointer. */
871
case 128: /* --debug */
874
case 'c': /* --connect */
877
case 'i': /* --interface */
880
case 's': /* --seckey */
883
case 'p': /* --pubkey */
886
case 129: /* --dh-bits */
888
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
894
case 130: /* --priority */
902
return ARGP_ERR_UNKNOWN;
907
struct argp argp = { .options = options, .parser = parse_opt,
909
.doc = "Mandos client -- Get and decrypt"
910
" passwords from a Mandos server" };
911
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
912
if (ret == ARGP_ERR_UNKNOWN){
913
fprintf(stderr, "Unknown error while parsing arguments\n");
914
exitcode = EXIT_FAILURE;
919
/* If the interface is down, bring it up */
921
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
924
exitcode = EXIT_FAILURE;
927
strcpy(network.ifr_name, interface);
928
ret = ioctl(sd, SIOCGIFFLAGS, &network);
930
perror("ioctl SIOCGIFFLAGS");
931
exitcode = EXIT_FAILURE;
934
if((network.ifr_flags & IFF_UP) == 0){
935
network.ifr_flags |= IFF_UP;
936
ret = ioctl(sd, SIOCSIFFLAGS, &network);
938
perror("ioctl SIOCSIFFLAGS");
939
exitcode = EXIT_FAILURE;
943
ret = TEMP_FAILURE_RETRY(close(sd));
962
ret = init_gnutls_global(&mc, pubkey, seckey);
964
fprintf(stderr, "init_gnutls_global failed\n");
965
exitcode = EXIT_FAILURE;
968
gnutls_initalized = true;
971
if(mkdtemp(tempdir) == NULL){
977
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
978
fprintf(stderr, "gpgme_initalized failed\n");
979
exitcode = EXIT_FAILURE;
982
gpgme_initalized = true;
985
if_index = (AvahiIfIndex) if_nametoindex(interface);
987
fprintf(stderr, "No such interface: \"%s\"\n", interface);
672
991
if(connect_to != NULL){
675
994
char *address = strrchr(connect_to, ':');
676
995
if(address == NULL){
677
996
fprintf(stderr, "No colon in address\n");
997
exitcode = EXIT_FAILURE;
681
1001
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
683
1003
perror("Bad port number");
1004
exitcode = EXIT_FAILURE;
686
1007
*address = '\0';
687
1008
address = connect_to;
688
ret = start_mandos_communication(address, port, if_index);
1009
ret = start_mandos_communication(address, port, if_index, &mc);
1011
exitcode = EXIT_FAILURE;
1013
exitcode = EXIT_SUCCESS;
697
1019
avahi_set_log_function(empty_log);
700
/* Initialize the psuedo-RNG */
1022
/* Initialize the pseudo-RNG for Avahi */
701
1023
srand((unsigned int) time(NULL));
703
/* Allocate main loop object */
704
if (!(simple_poll = avahi_simple_poll_new())) {
705
fprintf(stderr, "Failed to create simple poll object.\n");
710
/* Do not publish any local records */
711
avahi_server_config_init(&config);
712
config.publish_hinfo = 0;
713
config.publish_addresses = 0;
714
config.publish_workstation = 0;
715
config.publish_domain = 0;
717
/* Allocate a new server */
718
server = avahi_server_new(avahi_simple_poll_get(simple_poll),
719
&config, NULL, NULL, &error);
721
/* Free the configuration data */
722
avahi_server_config_free(&config);
724
/* Check if creating the server object succeeded */
726
fprintf(stderr, "Failed to create server: %s\n",
1025
/* Allocate main Avahi loop object */
1026
mc.simple_poll = avahi_simple_poll_new();
1027
if (mc.simple_poll == NULL) {
1028
fprintf(stderr, "Avahi: Failed to create simple poll"
1030
exitcode = EXIT_FAILURE;
1035
AvahiServerConfig config;
1036
/* Do not publish any local Zeroconf records */
1037
avahi_server_config_init(&config);
1038
config.publish_hinfo = 0;
1039
config.publish_addresses = 0;
1040
config.publish_workstation = 0;
1041
config.publish_domain = 0;
1043
/* Allocate a new server */
1044
mc.server = avahi_server_new(avahi_simple_poll_get
1045
(mc.simple_poll), &config, NULL,
1048
/* Free the Avahi configuration data */
1049
avahi_server_config_free(&config);
1052
/* Check if creating the Avahi server object succeeded */
1053
if (mc.server == NULL) {
1054
fprintf(stderr, "Failed to create Avahi server: %s\n",
727
1055
avahi_strerror(error));
728
returncode = EXIT_FAILURE;
1056
exitcode = EXIT_FAILURE;
732
/* Create the service browser */
733
sb = avahi_s_service_browser_new(server, if_index,
1060
/* Create the Avahi service browser */
1061
sb = avahi_s_service_browser_new(mc.server, if_index,
734
1062
AVAHI_PROTO_INET6,
735
1063
"_mandos._tcp", NULL, 0,
736
browse_callback, server);
1064
browse_callback, &mc);
738
1066
fprintf(stderr, "Failed to create service browser: %s\n",
739
avahi_strerror(avahi_server_errno(server)));
740
returncode = EXIT_FAILURE;
1067
avahi_strerror(avahi_server_errno(mc.server)));
1068
exitcode = EXIT_FAILURE;
744
1072
/* Run the main loop */
747
fprintf(stderr, "Starting avahi loop search\n");
1075
fprintf(stderr, "Starting Avahi loop search\n");
750
avahi_simple_poll_loop(simple_poll);
1078
avahi_simple_poll_loop(mc.simple_poll);
755
1083
fprintf(stderr, "%s exiting\n", argv[0]);
758
1086
/* Cleanup things */
760
1088
avahi_s_service_browser_free(sb);
763
avahi_server_free(server);
766
avahi_simple_poll_free(simple_poll);
1090
if (mc.server != NULL)
1091
avahi_server_free(mc.server);
1093
if (mc.simple_poll != NULL)
1094
avahi_simple_poll_free(mc.simple_poll);
1096
if (gnutls_initalized){
1097
gnutls_certificate_free_credentials(mc.cred);
1098
gnutls_global_deinit ();
1099
gnutls_dh_params_deinit(mc.dh_params);
1102
if(gpgme_initalized){
1103
gpgme_release(mc.ctx);
1106
/* Removes the temp directory used by GPGME */
1107
if(tempdir[0] != '\0'){
1109
struct dirent *direntry;
1110
d = opendir(tempdir);
1115
direntry = readdir(d);
1116
if(direntry == NULL){
1119
if (direntry->d_type == DT_REG){
1120
char *fullname = NULL;
1121
ret = asprintf(&fullname, "%s/%s", tempdir,
1127
ret = unlink(fullname);
1129
fprintf(stderr, "unlink(\"%s\"): %s",
1130
fullname, strerror(errno));
1137
ret = rmdir(tempdir);