2014-08-03 08:46:42 +02:00
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/*
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This file is part of libcapwap.
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libcapwap is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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libcapwap is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Foobar. If not, see <http://www.gnu.org/licenses/>.
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*/
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2015-02-08 16:28:04 +01:00
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#include <stdlib.h>
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2015-04-10 17:14:55 +02:00
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#include <errno.h>
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2014-08-03 08:46:42 +02:00
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#include <gnutls/gnutls.h>
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2015-02-08 16:28:04 +01:00
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#include "dtls_gnutls.h"
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#include "conn.h"
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2015-04-10 17:52:01 +02:00
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#include "log.h"
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2015-04-11 19:00:51 +02:00
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#include "dbg.h"
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2015-02-08 16:28:04 +01:00
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#include "cw_util.h"
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2015-04-11 19:00:51 +02:00
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#include "timer.h"
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2014-08-03 08:46:42 +02:00
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int dtls_gnutls_init()
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{
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2015-04-11 19:00:51 +02:00
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cw_dbg(DBG_INFO,"Init SSL library - using GnuTLS %s",gnutls_check_version(NULL));
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2014-08-03 08:46:42 +02:00
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gnutls_global_init();
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return 1;
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}
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2015-02-08 16:28:04 +01:00
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2015-02-08 21:07:55 +01:00
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int dtls_gnutls_shutdown(struct conn *conn)
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{
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/* implement it */
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return 1;
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}
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2015-02-08 16:28:04 +01:00
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void dtls_gnutls_data_destroy(struct dtls_gnutls_data *d)
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{
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free(d);
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}
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int dtls_gnutls_write(struct conn * conn, const uint8_t *buffer, int len)
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{
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struct dtls_gnutls_data * d = conn->dtls_data;
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int rc = gnutls_record_send(d->session,buffer,len);
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if ( rc < 0 ){
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cw_log(LOG_ERR, "DTLS - write error: %s", gnutls_strerror(rc));
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conn->dtls_error=1;
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2015-04-12 10:19:02 +02:00
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errno=ECONNRESET;
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2015-02-08 16:28:04 +01:00
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return -1;
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}
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return rc;
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}
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int dtls_gnutls_read(struct conn * conn, uint8_t *buffer, int len)
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{
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2015-03-09 23:51:13 +01:00
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uint8_t seq[8];
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2015-02-08 16:28:04 +01:00
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struct dtls_gnutls_data * d = conn->dtls_data;
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2015-03-09 23:51:13 +01:00
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int rc = gnutls_record_recv_seq(d->session,buffer,len,seq);
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2015-02-08 16:28:04 +01:00
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2015-04-10 17:14:55 +02:00
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if (rc==0) {
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errno = ECONNRESET;
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return -1;
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}
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if ( rc == GNUTLS_E_AGAIN ){
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errno = EAGAIN;
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return -1;
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}
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2015-02-08 16:28:04 +01:00
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if ( rc < 0 ){
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cw_log(LOG_ERR, "DTLS - read error: %s", gnutls_strerror(rc));
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conn->dtls_error=1;
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2015-04-12 10:19:02 +02:00
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errno=ECONNRESET;
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2015-02-08 16:28:04 +01:00
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return -1;
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}
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return rc;
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}
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2015-02-08 21:07:55 +01:00
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struct dtls_gnutls_data *dtls_gnutls_data_create(struct conn *conn,int config)
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2015-02-08 16:28:04 +01:00
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{
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struct dtls_gnutls_data *d = malloc(sizeof(struct dtls_gnutls_data));
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if (!d)
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return 0;
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gnutls_certificate_allocate_credentials(&d->x509_cred);
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int rc;
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/* Set credentials */
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rc = gnutls_certificate_set_x509_key_file(d->x509_cred, conn->dtls_cert_file,
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conn->dtls_key_file, GNUTLS_X509_FMT_PEM);
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if (rc < 0) {
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cw_log(LOG_ERR, "DTLS - Can't set cert/key: %s", gnutls_strerror(rc));
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dtls_gnutls_data_destroy(d);
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return 0;
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}
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2015-03-09 23:51:13 +01:00
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int bits;
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2015-04-30 08:36:40 +02:00
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#if GNUTLS_VERSION_NUMBER >= 0x030100
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2015-03-09 23:51:13 +01:00
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bits = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, GNUTLS_SEC_PARAM_INSECURE);
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2015-04-30 18:58:56 +02:00
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#else
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2015-04-30 08:36:40 +02:00
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bits = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, GNUTLS_SEC_PARAM_WEAK);
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#endif
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2015-03-09 23:51:13 +01:00
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/* Generate Diffie-Hellman parameters - for use with DHE
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* kx algorithms. When short bit length is used, it might
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* be wise to regenerate parameters often.
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*/
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gnutls_dh_params_init(&d->dh_params);
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gnutls_dh_params_generate2(d->dh_params, bits);
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gnutls_certificate_set_dh_params(d->x509_cred, d->dh_params);
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2015-02-08 16:28:04 +01:00
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/* Set ciphers */
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const char *errpos;
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rc = gnutls_priority_init(&d->priority_cache, conn->dtls_cipher, &errpos);
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if (rc < 0) {
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cw_log(LOG_ERR, "DTLS - Can't init ciphers '%s' at '%s' : %s", conn->dtls_cipher,
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errpos, gnutls_strerror(rc));
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dtls_gnutls_data_destroy(d);
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return 0;
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}
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2015-02-08 21:07:55 +01:00
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rc = gnutls_init(&d->session, config);
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2015-02-08 16:28:04 +01:00
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if (rc < 0) {
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cw_log(LOG_ERR, "DTLS - Can't init session: %s", gnutls_strerror(rc));
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dtls_gnutls_data_destroy(d);
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return 0;
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}
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gnutls_transport_set_ptr(d->session, conn);
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rc = gnutls_priority_set(d->session, d->priority_cache);
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if (rc < 0) {
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cw_log(LOG_ERR, "DTLS - Can't set priority: %s", gnutls_strerror(rc));
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dtls_gnutls_data_destroy(d);
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return 0;
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}
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rc = gnutls_credentials_set(d->session, GNUTLS_CRD_CERTIFICATE, d->x509_cred);
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if (rc < 0) {
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cw_log(LOG_ERR, "DTLS - Can't set credentials: %s", gnutls_strerror(rc));
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dtls_gnutls_data_destroy(d);
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return 0;
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}
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gnutls_transport_set_pull_function(d->session, dtls_gnutls_bio_read);
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gnutls_transport_set_push_function(d->session, dtls_gnutls_bio_write);
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2015-02-08 21:07:55 +01:00
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gnutls_transport_set_pull_timeout_function(d->session, dtls_gnutls_bio_wait);
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2015-02-08 16:28:04 +01:00
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return d;
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}
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