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-rw-r--r--src/utils/common/tls.c681
1 files changed, 681 insertions, 0 deletions
diff --git a/src/utils/common/tls.c b/src/utils/common/tls.c
new file mode 100644
index 0000000..57dfc9f
--- /dev/null
+++ b/src/utils/common/tls.c
@@ -0,0 +1,681 @@
+/* Copyright (C) 2020 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <assert.h>
+#include <arpa/inet.h>
+#include <stdbool.h>
+#include <string.h>
+#include <gnutls/gnutls.h>
+#include <gnutls/ocsp.h>
+#include <gnutls/x509.h>
+#include <poll.h>
+
+#include "utils/common/tls.h"
+#include "utils/common/cert.h"
+#include "utils/common/msg.h"
+#include "contrib/base64.h"
+#include "libknot/errcode.h"
+
+void tls_params_init(tls_params_t *params)
+{
+ if (params == NULL) {
+ return;
+ }
+
+ memset(params, 0, sizeof(*params));
+
+ init_list(&params->ca_files);
+ init_list(&params->pins);
+}
+
+int tls_params_copy(tls_params_t *dst, const tls_params_t *src)
+{
+ if (dst == NULL || src == NULL) {
+ return KNOT_EINVAL;
+ }
+
+ tls_params_init(dst);
+
+ dst->enable = src->enable;
+ dst->system_ca = src->system_ca;
+ if (src->hostname != NULL) {
+ dst->hostname = strdup(src->hostname);
+ if (dst->hostname == NULL) {
+ tls_params_clean(dst);
+ return KNOT_ENOMEM;
+ }
+ }
+
+ if (src->sni != NULL) {
+ dst->sni = strdup(src->sni);
+ if (dst->sni == NULL) {
+ tls_params_clean(dst);
+ return KNOT_ENOMEM;
+ }
+ }
+
+ if (src->keyfile != NULL) {
+ dst->keyfile = strdup(src->keyfile);
+ if (dst->keyfile == NULL) {
+ tls_params_clean(dst);
+ return KNOT_ENOMEM;
+ }
+ }
+
+ if (src->certfile != NULL) {
+ dst->certfile = strdup(src->certfile);
+ if (dst->certfile == NULL) {
+ tls_params_clean(dst);
+ return KNOT_ENOMEM;
+ }
+ }
+
+ dst->ocsp_stapling = src->ocsp_stapling;
+
+ ptrnode_t *n;
+ WALK_LIST(n, src->ca_files) {
+ char *src_file = (char *)n->d;
+ char *file = strdup(src_file);
+ if (file == NULL || ptrlist_add(&dst->ca_files, file, NULL) == NULL) {
+ tls_params_clean(dst);
+ return KNOT_ENOMEM;
+ }
+ }
+ WALK_LIST(n, src->pins) {
+ uint8_t *src_pin = (uint8_t *)n->d;
+ uint8_t *pin = malloc(1 + src_pin[0]);
+ if (pin == NULL || ptrlist_add(&dst->pins, pin, NULL) == NULL) {
+ tls_params_clean(dst);
+ return KNOT_ENOMEM;
+ }
+ memcpy(pin, src_pin, 1 + src_pin[0]);
+ }
+
+ return KNOT_EOK;
+}
+
+void tls_params_clean(tls_params_t *params)
+{
+ if (params == NULL) {
+ return;
+ }
+
+ ptrnode_t *node, *nxt;
+ WALK_LIST_DELSAFE(node, nxt, params->ca_files) {
+ free(node->d);
+ }
+ ptrlist_free(&params->ca_files, NULL);
+
+ WALK_LIST_DELSAFE(node, nxt, params->pins) {
+ free(node->d);
+ }
+ ptrlist_free(&params->pins, NULL);
+
+ free(params->hostname);
+ free(params->sni);
+ free(params->keyfile);
+ free(params->certfile);
+
+ memset(params, 0, sizeof(*params));
+}
+
+static bool check_pin(const uint8_t *cert_pin, size_t cert_pin_len, const list_t *pins)
+{
+ if (EMPTY_LIST(*pins)) {
+ return false;
+ }
+
+ ptrnode_t *n;
+ WALK_LIST(n, *pins) {
+ uint8_t *pin = (uint8_t *)n->d;
+ if (pin[0] == cert_pin_len &&
+ memcmp(cert_pin, &pin[1], cert_pin_len) == 0) {
+ return true;
+ }
+ }
+
+ return false;
+}
+
+static bool verify_ocsp(gnutls_session_t *session)
+{
+ bool ret = false;
+
+ gnutls_ocsp_resp_t ocsp_resp;
+ bool deinit_ocsp_resp = false;
+
+ gnutls_x509_crt_t server_cert;
+ bool deinit_server_cert = false;
+
+ gnutls_certificate_credentials_t xcred;
+ bool deinit_xcreds = false;
+
+ gnutls_x509_crt_t issuer_cert;
+ bool deinit_issuer_cert = false;
+
+ gnutls_datum_t ocsp_resp_raw;
+ if (gnutls_ocsp_status_request_get(*session, &ocsp_resp_raw) != GNUTLS_E_SUCCESS) {
+ WARN("TLS, unable to retrieve stapled OCSP data\n");
+ goto cleanup;
+ }
+ if (gnutls_ocsp_resp_init(&ocsp_resp) != GNUTLS_E_SUCCESS) {
+ WARN("TLS, unable to init OCSP data\n");
+ goto cleanup;
+ }
+ deinit_ocsp_resp = true;
+ if (gnutls_ocsp_resp_import(ocsp_resp, &ocsp_resp_raw) != GNUTLS_E_SUCCESS) {
+ WARN("TLS, unable to import OCSP response\n");
+ goto cleanup;
+ }
+
+ unsigned int cert_list_size = 0;
+ const gnutls_datum_t *cert_list = gnutls_certificate_get_peers(*session, &cert_list_size);
+ if (cert_list_size == 0) {
+ WARN("TLS, unable to retrieve peer certs when verifying OCSP\n");
+ goto cleanup;
+ }
+ if (gnutls_x509_crt_init(&server_cert) != GNUTLS_E_SUCCESS) {
+ WARN("TLS, unable to init server cert when verifying OCSP\n");
+ goto cleanup;
+ }
+ deinit_server_cert = true;
+ if (gnutls_x509_crt_import(server_cert, &cert_list[0], GNUTLS_X509_FMT_DER) != GNUTLS_E_SUCCESS) {
+ WARN("TLS, unable to import server cert when verifying OCSP\n");
+ goto cleanup;
+ }
+
+ if (gnutls_certificate_allocate_credentials(&xcred) != GNUTLS_E_SUCCESS) {
+ WARN("TLS, unable to allocate credentials when verifying OCSP\n");
+ goto cleanup;
+ }
+ deinit_xcreds = true;
+
+ if (gnutls_certificate_get_issuer(xcred, server_cert, &issuer_cert, 0) != GNUTLS_E_SUCCESS) {
+ if (cert_list_size < 2) {
+ WARN("TLS, unable to get issuer (CA) cert when verifying OCSP\n");
+ goto cleanup;
+ }
+ if (gnutls_x509_crt_init(&issuer_cert) != GNUTLS_E_SUCCESS) {
+ WARN("TLS, unable to init issuer cert when verifying OCSP\n");
+ goto cleanup;
+ }
+ deinit_issuer_cert = true;
+ if (gnutls_x509_crt_import(issuer_cert, &cert_list[1], GNUTLS_X509_FMT_DER) != GNUTLS_E_SUCCESS) {
+ WARN("TLS, unable to import issuer cert when verifying OCSP\n");
+ goto cleanup;
+ }
+ }
+
+ unsigned int status;
+ time_t this_upd, next_upd, now = time(0);
+ if (gnutls_ocsp_resp_check_crt(ocsp_resp, 0, server_cert) != GNUTLS_E_SUCCESS) {
+ WARN("TLS, OCSP response either empty or not for provided server cert\n");
+ goto cleanup;
+ }
+ if (gnutls_ocsp_resp_verify_direct(ocsp_resp, issuer_cert, &status, 0) != GNUTLS_E_SUCCESS) {
+ WARN("TLS, unable to verify OCSP response against issuer cert\n");
+ goto cleanup;
+ }
+ if (status != 0) {
+ WARN("TLS, got a non-zero status when verifying OCSP response against issuer cert\n");
+ goto cleanup;
+ }
+ if (gnutls_ocsp_resp_get_single(ocsp_resp, 0, NULL, NULL, NULL, NULL, &status,
+ &this_upd, &next_upd, NULL, NULL) != GNUTLS_E_SUCCESS) {
+ WARN("TLS, error reading OCSP response\n");
+ goto cleanup;
+ }
+ if (status == GNUTLS_OCSP_CERT_REVOKED) {
+ WARN("TLS, OCSP data shows that cert was revoked\n");
+ goto cleanup;
+ }
+ if (next_upd == -1) {
+ tls_ctx_t *ctx = gnutls_session_get_ptr(*session);
+ assert(now >= this_upd);
+ assert(ctx->params->ocsp_stapling > 0);
+ if (now - this_upd > ctx->params->ocsp_stapling) {
+ WARN("TLS, OCSP response is out of date.\n");
+ goto cleanup;
+ }
+ } else {
+ if (next_upd < now) {
+ WARN("TLS, a newer OCSP response is available but was not sent\n");
+ goto cleanup;
+ }
+ }
+
+ // Only if we get here is the ocsp result completely valid.
+ ret = true;
+
+cleanup:
+ if (deinit_issuer_cert) {
+ gnutls_x509_crt_deinit(issuer_cert);
+ }
+ if (deinit_xcreds) {
+ gnutls_certificate_free_credentials(xcred);
+ }
+ if (deinit_server_cert) {
+ gnutls_x509_crt_deinit(server_cert);
+ }
+ if (deinit_ocsp_resp) {
+ gnutls_ocsp_resp_deinit(ocsp_resp);
+ }
+
+ return ret;
+}
+
+static int check_certificates(gnutls_session_t session, const list_t *pins)
+{
+ if (gnutls_certificate_type_get(session) != GNUTLS_CRT_X509) {
+ DBG("TLS, invalid certificate type\n");
+ return GNUTLS_E_CERTIFICATE_ERROR;
+ }
+
+ unsigned cert_list_size;
+ const gnutls_datum_t *cert_list =
+ gnutls_certificate_get_peers(session, &cert_list_size);
+ if (cert_list == NULL || cert_list_size == 0) {
+ DBG("TLS, empty certificate list\n");
+ return GNUTLS_E_CERTIFICATE_ERROR;
+ }
+
+ size_t matches = 0;
+
+ DBG("TLS, received certificate hierarchy:\n");
+ for (int i = 0; i < cert_list_size; i++) {
+ gnutls_x509_crt_t cert;
+ int ret = gnutls_x509_crt_init(&cert);
+ if (ret != GNUTLS_E_SUCCESS) {
+ return ret;
+ }
+
+ ret = gnutls_x509_crt_import(cert, &cert_list[i], GNUTLS_X509_FMT_DER);
+ if (ret != GNUTLS_E_SUCCESS) {
+ gnutls_x509_crt_deinit(cert);
+ return ret;
+ }
+
+ gnutls_datum_t cert_name = { 0 };
+ ret = gnutls_x509_crt_get_dn2(cert, &cert_name);
+ if (ret != GNUTLS_E_SUCCESS) {
+ gnutls_x509_crt_deinit(cert);
+ return ret;
+ }
+ DBG(" #%i, %s\n", i + 1, cert_name.data);
+ gnutls_free(cert_name.data);
+
+ uint8_t cert_pin[CERT_PIN_LEN] = { 0 };
+ ret = cert_get_pin(cert, cert_pin, sizeof(cert_pin));
+ if (ret != KNOT_EOK) {
+ gnutls_x509_crt_deinit(cert);
+ return GNUTLS_E_CERTIFICATE_ERROR;
+ }
+
+ // Check if correspond to a specified PIN.
+ bool match = check_pin(cert_pin, sizeof(cert_pin), pins);
+ if (match) {
+ matches++;
+ }
+
+ uint8_t *txt_pin;
+ ret = knot_base64_encode_alloc(cert_pin, sizeof(cert_pin), &txt_pin);
+ if (ret < 0) {
+ gnutls_x509_crt_deinit(cert);
+ return ret;
+ }
+ DBG(" SHA-256 PIN: %.*s%s\n", ret, txt_pin, match ? ", MATCH" : "");
+ free(txt_pin);
+
+ gnutls_x509_crt_deinit(cert);
+ }
+
+ if (matches > 0) {
+ return GNUTLS_E_SUCCESS;
+ } else if (EMPTY_LIST(*pins)) {
+ DBG("TLS, skipping certificate PIN check\n");
+ return GNUTLS_E_SUCCESS;
+ } else {
+ DBG("TLS, no certificate PIN match\n");
+ return GNUTLS_E_CERTIFICATE_ERROR;
+ }
+}
+
+static bool do_verification(const tls_params_t *params)
+{
+ return params->hostname != NULL || params->system_ca ||
+ !EMPTY_LIST(params->ca_files) || params->ocsp_stapling > 0;
+}
+
+static int verify_certificate(gnutls_session_t session)
+{
+ tls_ctx_t *ctx = gnutls_session_get_ptr(session);
+
+ // Check for pinned certificates and print certificate hierarchy.
+ int ret = check_certificates(session, &ctx->params->pins);
+ if (ret != GNUTLS_E_SUCCESS) {
+ return ret;
+ }
+
+ if (!do_verification(ctx->params)) {
+ DBG("TLS, skipping certificate verification\n");
+ return GNUTLS_E_SUCCESS;
+ }
+
+ if (ctx->params->ocsp_stapling > 0 && !verify_ocsp(&session)) {
+ WARN("TLS, failed to validate required OCSP data\n");
+ return GNUTLS_E_CERTIFICATE_ERROR;
+ }
+
+ // Set server certificate check.
+ gnutls_typed_vdata_st data[2] = {
+ { .type = GNUTLS_DT_KEY_PURPOSE_OID,
+ .data = (void *)GNUTLS_KP_TLS_WWW_SERVER },
+ { .type = GNUTLS_DT_DNS_HOSTNAME,
+ .data = (void *)ctx->params->hostname }
+ };
+ size_t data_count = (ctx->params->hostname != NULL) ? 2 : 1;
+ if (data_count == 1) {
+ WARN("TLS, no hostname provided, will not verify certificate owner\n")
+ }
+
+ unsigned int status;
+ ret = gnutls_certificate_verify_peers(session, data, data_count, &status);
+ if (ret != GNUTLS_E_SUCCESS) {
+ WARN("TLS, failed to verify peer certificate\n");
+ return GNUTLS_E_CERTIFICATE_ERROR;
+ }
+
+ gnutls_datum_t msg;
+ ret = gnutls_certificate_verification_status_print(
+ status, gnutls_certificate_type_get(session), &msg, 0);
+ if (ret == GNUTLS_E_SUCCESS) {
+ DBG("TLS, %s\n", msg.data);
+ }
+ gnutls_free(msg.data);
+
+ if (status != 0) {
+ return GNUTLS_E_CERTIFICATE_ERROR;
+ }
+
+ return GNUTLS_E_SUCCESS;
+}
+
+int tls_ctx_init(tls_ctx_t *ctx, const tls_params_t *params, int wait)
+{
+ if (ctx == NULL || params == NULL || !params->enable) {
+ return KNOT_EINVAL;
+ }
+
+ memset(ctx, 0, sizeof(*ctx));
+ ctx->params = params;
+ ctx->wait = wait;
+ ctx->sockfd = -1;
+
+ int ret = gnutls_certificate_allocate_credentials(&ctx->credentials);
+ if (ret != GNUTLS_E_SUCCESS) {
+ return KNOT_ENOMEM;
+ }
+
+ // Import system certificates.
+ if (ctx->params->system_ca ||
+ (ctx->params->hostname != NULL && EMPTY_LIST(ctx->params->ca_files))) {
+ ret = gnutls_certificate_set_x509_system_trust(ctx->credentials);
+ if (ret < 0) {
+ WARN("TLS, failed to import system certificates (%s)\n",
+ gnutls_strerror_name(ret));
+ return KNOT_ERROR;
+ } else {
+ DBG("TLS, imported %i system certificates\n", ret);
+ }
+ }
+
+ // Import provided certificate files.
+ ptrnode_t *n;
+ WALK_LIST(n, ctx->params->ca_files) {
+ const char *file = (char *)n->d;
+ ret = gnutls_certificate_set_x509_trust_file(ctx->credentials, file,
+ GNUTLS_X509_FMT_PEM);
+ if (ret < 0) {
+ WARN("TLS, failed to import certificate file '%s' (%s)\n",
+ file, gnutls_strerror_name(ret));
+ return KNOT_ERROR;
+ } else {
+ DBG("TLS, imported %i certificates from '%s'\n", ret, file);
+ }
+ }
+
+ gnutls_certificate_set_verify_function(ctx->credentials, verify_certificate);
+
+ // Setup client keypair if specified. Both key and cert files must be provided.
+ if (params->keyfile != NULL && params->certfile != NULL) {
+ // First, try PEM.
+ ret = gnutls_certificate_set_x509_key_file(ctx->credentials,
+ params->certfile, params->keyfile, GNUTLS_X509_FMT_PEM);
+ if (ret != GNUTLS_E_SUCCESS) {
+ // If PEM didn't work, try DER.
+ ret = gnutls_certificate_set_x509_key_file(ctx->credentials,
+ params->certfile, params->keyfile, GNUTLS_X509_FMT_DER);
+ }
+
+ if (ret != GNUTLS_E_SUCCESS) {
+ WARN("TLS, failed to add client certfile '%s' and keyfile '%s'\n",
+ params->certfile, params->keyfile);
+ return KNOT_ERROR;
+ } else {
+ DBG("TLS, added client certfile '%s' and keyfile '%s'\n",
+ params->certfile, params->keyfile);
+ }
+ } else if (params->keyfile != NULL) {
+ WARN("TLS, cannot use client keyfile without a certfile\n");
+ return KNOT_ERROR;
+ } else if (params->certfile != NULL) {
+ WARN("TLS, cannot use client certfile without a keyfile\n");
+ return KNOT_ERROR;
+ }
+
+ return KNOT_EOK;
+}
+
+int tls_ctx_connect(tls_ctx_t *ctx, int sockfd, const char *remote)
+{
+ if (ctx == NULL) {
+ return KNOT_EINVAL;
+ }
+
+ int ret = gnutls_init(&ctx->session, GNUTLS_CLIENT | GNUTLS_NONBLOCK);
+ if (ret != GNUTLS_E_SUCCESS) {
+ return KNOT_NET_ECONNECT;
+ }
+
+ ret = gnutls_set_default_priority(ctx->session);
+ if (ret != GNUTLS_E_SUCCESS) {
+ return KNOT_NET_ECONNECT;
+ }
+
+ ret = gnutls_credentials_set(ctx->session, GNUTLS_CRD_CERTIFICATE,
+ ctx->credentials);
+ if (ret != GNUTLS_E_SUCCESS) {
+ return KNOT_NET_ECONNECT;
+ }
+
+ if (remote != NULL) {
+ ret = gnutls_server_name_set(ctx->session, GNUTLS_NAME_DNS, remote,
+ strlen(remote));
+ if (ret != GNUTLS_E_SUCCESS) {
+ return KNOT_NET_ECONNECT;
+ }
+ }
+
+ gnutls_session_set_ptr(ctx->session, ctx);
+ gnutls_transport_set_int(ctx->session, sockfd);
+ gnutls_handshake_set_timeout(ctx->session, 1000 * ctx->wait);
+
+ // Initialize poll descriptor structure.
+ struct pollfd pfd = {
+ .fd = sockfd,
+ .events = POLLIN,
+ .revents = 0,
+ };
+
+ // Perform the TLS handshake
+ do {
+ ret = gnutls_handshake(ctx->session);
+ if (ret != GNUTLS_E_SUCCESS && gnutls_error_is_fatal(ret) == 0) {
+ if (poll(&pfd, 1, 1000 * ctx->wait) != 1) {
+ WARN("TLS, peer took too long to respond\n");
+ return KNOT_NET_ETIMEOUT;
+ }
+ }
+ } while (ret != GNUTLS_E_SUCCESS && gnutls_error_is_fatal(ret) == 0);
+ if (ret != GNUTLS_E_SUCCESS) {
+ WARN("TLS, handshake failed (%s)\n", gnutls_strerror(ret));
+ tls_ctx_close(ctx);
+ return KNOT_NET_ESOCKET;
+ }
+
+ // Save the socket descriptor.
+ ctx->sockfd = sockfd;
+
+ return KNOT_EOK;
+}
+
+int tls_ctx_send(tls_ctx_t *ctx, const uint8_t *buf, const size_t buf_len)
+{
+ if (ctx == NULL || buf == NULL) {
+ return KNOT_EINVAL;
+ }
+
+ uint16_t msg_len = htons(buf_len);
+
+ gnutls_record_cork(ctx->session);
+
+ if (gnutls_record_send(ctx->session, &msg_len, sizeof(msg_len)) <= 0) {
+ WARN("TLS, failed to send\n");
+ return KNOT_NET_ESEND;
+ }
+ if (gnutls_record_send(ctx->session, buf, buf_len) <= 0) {
+ WARN("TLS, failed to send\n");
+ return KNOT_NET_ESEND;
+ }
+
+ while (gnutls_record_check_corked(ctx->session) > 0) {
+ int ret = gnutls_record_uncork(ctx->session, 0);
+ if (ret < 0 && gnutls_error_is_fatal(ret) != 0) {
+ WARN("TLS, failed to send (%s)\n", gnutls_strerror(ret));
+ return KNOT_NET_ESEND;
+ }
+ }
+
+ return KNOT_EOK;
+}
+
+int tls_ctx_receive(tls_ctx_t *ctx, uint8_t *buf, const size_t buf_len)
+{
+ if (ctx == NULL || buf == NULL) {
+ return KNOT_EINVAL;
+ }
+
+ // Initialize poll descriptor structure.
+ struct pollfd pfd = {
+ .fd = ctx->sockfd,
+ .events = POLLIN,
+ .revents = 0,
+ };
+
+ uint32_t total = 0;
+ uint16_t msg_len = 0;
+
+ // Receive message header.
+ while (total < sizeof(msg_len)) {
+ ssize_t ret = gnutls_record_recv(ctx->session,
+ (uint8_t *)&msg_len + total,
+ sizeof(msg_len) - total);
+ if (ret > 0) {
+ total += ret;
+ } else if (ret == 0) {
+ WARN("TLS, peer has closed the connection\n");
+ return KNOT_NET_ERECV;
+ } else if (gnutls_error_is_fatal(ret) != 0) {
+ WARN("TLS, failed to receive reply (%s)\n",
+ gnutls_strerror(ret));
+ return KNOT_NET_ERECV;
+ } else if (poll(&pfd, 1, 1000 * ctx->wait) != 1) {
+ WARN("TLS, peer took too long to respond\n");
+ return KNOT_NET_ETIMEOUT;
+ }
+ }
+
+ // Convert number to host format.
+ msg_len = ntohs(msg_len);
+ if (msg_len > buf_len) {
+ return KNOT_ESPACE;
+ }
+
+ total = 0;
+
+ // Receive data over TLS
+ while (total < msg_len) {
+ ssize_t ret = gnutls_record_recv(ctx->session, buf + total,
+ msg_len - total);
+ if (ret > 0) {
+ total += ret;
+ } else if (ret == 0) {
+ WARN("TLS, peer has closed the connection\n");
+ return KNOT_NET_ERECV;
+ } else if (gnutls_error_is_fatal(ret) != 0) {
+ WARN("TLS, failed to receive reply (%s)\n",
+ gnutls_strerror(ret));
+ return KNOT_NET_ERECV;
+ } else if (poll(&pfd, 1, 1000 * ctx->wait) != 1) {
+ WARN("TLS, peer took too long to respond\n");
+ return KNOT_NET_ETIMEOUT;
+ }
+ }
+
+ return total;
+}
+
+void tls_ctx_close(tls_ctx_t *ctx)
+{
+ if (ctx == NULL || ctx->session == NULL) {
+ return;
+ }
+
+ gnutls_bye(ctx->session, GNUTLS_SHUT_RDWR);
+ gnutls_deinit(ctx->session);
+}
+
+void tls_ctx_deinit(tls_ctx_t *ctx)
+{
+ if (ctx == NULL) {
+ return;
+ }
+
+ if (ctx->credentials != NULL) {
+ gnutls_certificate_free_credentials(ctx->credentials);
+ }
+}
+
+void print_tls(const tls_ctx_t *ctx)
+{
+ if (ctx == NULL || ctx->session == NULL) {
+ return;
+ }
+
+ char *msg = gnutls_session_get_desc(ctx->session);
+ printf(";; TLS session %s\n", msg);
+ gnutls_free(msg);
+}