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* Copyright (c) 2018 Intel Corporation
* Copyright (c) 2018 Nordic Semiconductor ASA
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <stdbool.h>
#include <fcntl.h>
#include <logging/log.h>
LOG_MODULE_REGISTER(net_sock_tls, CONFIG_NET_SOCKETS_LOG_LEVEL);
#include <init.h>
#include <entropy.h>
#include <misc/util.h>
#include <net/net_context.h>
#include <net/socket.h>
#include <syscall_handler.h>
#include <misc/fdtable.h>
#if defined(CONFIG_MBEDTLS)
#if !defined(CONFIG_MBEDTLS_CFG_FILE)
#include "mbedtls/config.h"
#else
#include CONFIG_MBEDTLS_CFG_FILE
#endif /* CONFIG_MBEDTLS_CFG_FILE */
#include <mbedtls/ctr_drbg.h>
#include <mbedtls/net_sockets.h>
#include <mbedtls/x509.h>
#include <mbedtls/x509_crt.h>
#include <mbedtls/ssl.h>
#include <mbedtls/ssl_cookie.h>
#include <mbedtls/error.h>
#include <mbedtls/debug.h>
#endif /* CONFIG_MBEDTLS */
#include "sockets_internal.h"
#include "tls_internal.h"
extern const struct socket_op_vtable sock_fd_op_vtable;
static const struct socket_op_vtable tls_sock_fd_op_vtable;
/** A list of secure tags that TLS context should use. */
struct sec_tag_list {
/** An array of secure tags referencing TLS credentials. */
sec_tag_t sec_tags[CONFIG_NET_SOCKETS_TLS_MAX_CREDENTIALS];
/** Number of configured secure tags. */
int sec_tag_count;
};
/** Timer context for DTLS. */
struct dtls_timing_context {
/** Current time, stored during timer set. */
u32_t snapshot;
/** Intermediate delay value. For details, refer to mbedTLS API
* documentation (mbedtls_ssl_set_timer_t).
*/
u32_t int_ms;
/** Final delay value. For details, refer to mbedTLS API documentation
* (mbedtls_ssl_set_timer_t).
*/
u32_t fin_ms;
};
/** TLS context information. */
struct tls_context {
/** Information whether TLS context is used. */
bool is_used;
/** Secure protocol version running on TLS context. */
enum net_ip_protocol_secure tls_version;
/** Socket flags passed to a socket call. */
int flags;
/** Information whether TLS context was initialized. */
bool is_initialized;
/** Information whether TLS handshake is complete or not. */
struct k_sem tls_established;
/** TLS specific option values. */
struct {
/** Select which credentials to use with TLS. */
struct sec_tag_list sec_tag_list;
/** 0-terminated list of allowed ciphersuites (mbedTLS format).
*/
int ciphersuites[CONFIG_NET_SOCKETS_TLS_MAX_CIPHERSUITES + 1];
/** Information if hostname was explicitly set on a socket. */
bool is_hostname_set;
/** Peer verification level. */
s8_t verify_level;
/** DTLS role, client by default. */
s8_t role;
} options;
#if defined(CONFIG_NET_SOCKETS_ENABLE_DTLS)
/** Context information for DTLS timing. */
struct dtls_timing_context dtls_timing;
/** mbedTLS cookie context for DTLS */
mbedtls_ssl_cookie_ctx cookie;
/** DTLS peer address. */
struct sockaddr dtls_peer_addr;
/** DTLS peer address length. */
socklen_t dtls_peer_addrlen;
#endif /* CONFIG_NET_SOCKETS_ENABLE_DTLS */
#if defined(CONFIG_MBEDTLS)
/** mbedTLS context. */
mbedtls_ssl_context ssl;
/** mbedTLS configuration. */
mbedtls_ssl_config config;
#if defined(MBEDTLS_X509_CRT_PARSE_C)
/** mbedTLS structure for CA chain. */
mbedtls_x509_crt ca_chain;
/** mbedTLS structure for own certificate. */
mbedtls_x509_crt own_cert;
/** mbedTLS structure for own private key. */
mbedtls_pk_context priv_key;
#endif /* MBEDTLS_X509_CRT_PARSE_C */
#endif /* CONFIG_MBEDTLS */
};
static mbedtls_ctr_drbg_context tls_ctr_drbg;
/* A global pool of TLS contexts. */
static struct tls_context tls_contexts[CONFIG_NET_SOCKETS_TLS_MAX_CONTEXTS];
/* A mutex for protecting TLS context allocation. */
static struct k_mutex context_lock;
#define IS_LISTENING(context) (net_context_get_state(context) == \
NET_CONTEXT_LISTENING)
#if defined(MBEDTLS_DEBUG_C) && (CONFIG_NET_SOCKETS_LOG_LEVEL >= LOG_LEVEL_DBG)
static void tls_debug(void *ctx, int level, const char *file,
int line, const char *str)
{
const char *p, *basename;
ARG_UNUSED(ctx);
if (!file || !str) {
return;
}
/* Extract basename from file */
for (p = basename = file; *p != '\0'; p++) {
if (*p == '/' || *p == '\\') {
basename = p + 1;
}
}
NET_DBG("%s:%04d: |%d| %s", basename, line, level,
log_strdup(str));
}
#endif /* defined(MBEDTLS_DEBUG_C) && (CONFIG_NET_SOCKETS_LOG_LEVEL >= LOG_LEVEL_DBG) */
#if defined(CONFIG_ENTROPY_HAS_DRIVER)
static int tls_entropy_func(void *ctx, unsigned char *buf, size_t len)
{
return entropy_get_entropy(ctx, buf, len);
}
#else
static int tls_entropy_func(void *ctx, unsigned char *buf, size_t len)
{
ARG_UNUSED(ctx);
size_t i = len / 4;
u32_t val;
while (i--) {
val = sys_rand32_get();
UNALIGNED_PUT(val, (u32_t *)buf);
buf += 4;
}
i = len & 0x3;
val = sys_rand32_get();
while (i--) {
*buf++ = val;
val >>= 8;
}
return 0;
}
#endif /* defined(CONFIG_ENTROPY_HAS_DRIVER) */
#if defined(CONFIG_NET_SOCKETS_ENABLE_DTLS)
/* mbedTLS-defined function for setting timer. */
static void dtls_timing_set_delay(void *data, uint32_t int_ms, uint32_t fin_ms)
{
struct dtls_timing_context *ctx = data;
ctx->int_ms = int_ms;
ctx->fin_ms = fin_ms;
if (fin_ms != 0U) {
ctx->snapshot = k_uptime_get_32();
}
}
/* mbedTLS-defined function for getting timer status.
* The return values are specified by mbedTLS. The callback must return:
* -1 if cancelled (fin_ms == 0),
* 0 if none of the delays have passed,
* 1 if only the intermediate delay has passed,
* 2 if the final delay has passed.
*/
static int dtls_timing_get_delay(void *data)
{
struct dtls_timing_context *timing = data;
unsigned long elapsed_ms;
NET_ASSERT(timing);
if (timing->fin_ms == 0U) {
return -1;
}
elapsed_ms = k_uptime_get_32() - timing->snapshot;
if (elapsed_ms >= timing->fin_ms) {
return 2;
}
if (elapsed_ms >= timing->int_ms) {
return 1;
}
return 0;
}
#endif /* CONFIG_NET_SOCKETS_ENABLE_DTLS */
/* Initialize TLS internals. */
static int tls_init(struct device *unused)
{
ARG_UNUSED(unused);
int ret;
static const unsigned char drbg_seed[] = "zephyr";
struct device *dev = NULL;
#if defined(CONFIG_ENTROPY_HAS_DRIVER)
dev = device_get_binding(CONFIG_ENTROPY_NAME);
if (!dev) {
NET_ERR("Failed to obtain entropy device");
return -ENODEV;
}
#else
NET_WARN("No entropy device on the system, "
"TLS communication may be insecure!");
#endif /* defined(CONFIG_ENTROPY_HAS_DRIVER) */
(void)memset(tls_contexts, 0, sizeof(tls_contexts));
k_mutex_init(&context_lock);
mbedtls_ctr_drbg_init(&tls_ctr_drbg);
ret = mbedtls_ctr_drbg_seed(&tls_ctr_drbg, tls_entropy_func, dev,
drbg_seed, sizeof(drbg_seed));
if (ret != 0) {
mbedtls_ctr_drbg_free(&tls_ctr_drbg);
NET_ERR("TLS entropy source initialization failed");
return -EFAULT;
}
#if defined(MBEDTLS_DEBUG_C) && (CONFIG_NET_SOCKETS_LOG_LEVEL >= LOG_LEVEL_DBG)
mbedtls_debug_set_threshold(CONFIG_MBEDTLS_DEBUG_LEVEL);
#endif
return 0;
}
SYS_INIT(tls_init, APPLICATION, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT);
static inline bool is_handshake_complete(struct net_context *ctx)
{
return k_sem_count_get(&ctx->tls->tls_established) != 0;
}
/* Allocate TLS context. */
static struct tls_context *tls_alloc(void)
{
int i;
struct tls_context *tls = NULL;
k_mutex_lock(&context_lock, K_FOREVER);
for (i = 0; i < ARRAY_SIZE(tls_contexts); i++) {
if (!tls_contexts[i].is_used) {
tls = &tls_contexts[i];
(void)memset(tls, 0, sizeof(*tls));
tls->is_used = true;
tls->options.verify_level = -1;
NET_DBG("Allocated TLS context, %p", tls);
break;
}
}
k_mutex_unlock(&context_lock);
if (tls) {
k_sem_init(&tls->tls_established, 0, 1);
mbedtls_ssl_init(&tls->ssl);
mbedtls_ssl_config_init(&tls->config);
#if defined(CONFIG_NET_SOCKETS_ENABLE_DTLS)
mbedtls_ssl_cookie_init(&tls->cookie);
#endif
#if defined(MBEDTLS_X509_CRT_PARSE_C)
mbedtls_x509_crt_init(&tls->ca_chain);
mbedtls_x509_crt_init(&tls->own_cert);
mbedtls_pk_init(&tls->priv_key);
#endif
#if defined(MBEDTLS_DEBUG_C) && (CONFIG_NET_SOCKETS_LOG_LEVEL >= LOG_LEVEL_DBG)
mbedtls_ssl_conf_dbg(&tls->config, tls_debug, NULL);
#endif
} else {
NET_WARN("Failed to allocate TLS context");
}
return tls;
}
/* Allocate new TLS context and copy the content from the source context. */
static struct tls_context *tls_clone(struct tls_context *source_tls)
{
struct tls_context *target_tls;
target_tls = tls_alloc();
if (!target_tls) {
return NULL;
}
target_tls->tls_version = source_tls->tls_version;
memcpy(&target_tls->options, &source_tls->options,
sizeof(target_tls->options));
#if defined(MBEDTLS_X509_CRT_PARSE_C)
if (target_tls->options.is_hostname_set) {
mbedtls_ssl_set_hostname(&target_tls->ssl,
source_tls->ssl.hostname);
}
#endif
return target_tls;
}
/* Release TLS context. */
static int tls_release(struct tls_context *tls)
{
if (!PART_OF_ARRAY(tls_contexts, tls)) {
NET_ERR("Invalid TLS context");
return -EBADF;
}
if (!tls->is_used) {
NET_ERR("Deallocating unused TLS context");
return -EBADF;
}
#if defined(CONFIG_NET_SOCKETS_ENABLE_DTLS)
mbedtls_ssl_cookie_free(&tls->cookie);
#endif
mbedtls_ssl_config_free(&tls->config);
mbedtls_ssl_free(&tls->ssl);
#if defined(MBEDTLS_X509_CRT_PARSE_C)
mbedtls_x509_crt_free(&tls->ca_chain);
mbedtls_x509_crt_free(&tls->own_cert);
mbedtls_pk_free(&tls->priv_key);
#endif
tls->is_used = false;
return 0;
}
static inline int time_left(u32_t start, u32_t timeout)
{
u32_t elapsed = k_uptime_get_32() - start;
return timeout - elapsed;
}
#if defined(CONFIG_NET_SOCKETS_ENABLE_DTLS)
static bool dtls_is_peer_addr_valid(struct net_context *context,
const struct sockaddr *peer_addr,
socklen_t addrlen)
{
if (context->tls->dtls_peer_addrlen != addrlen ||
context->tls->dtls_peer_addr.sa_family != peer_addr->sa_family) {
return false;
}
if (IS_ENABLED(CONFIG_NET_IPV6) && peer_addr->sa_family == AF_INET6) {
struct sockaddr_in6 *addr1 = net_sin6(peer_addr);
struct sockaddr_in6 *addr2 =
net_sin6(&context->tls->dtls_peer_addr);
return (addr1->sin6_port == addr2->sin6_port) &&
net_ipv6_addr_cmp(&addr1->sin6_addr, &addr2->sin6_addr);
} else if (IS_ENABLED(CONFIG_NET_IPV4) &&
peer_addr->sa_family == AF_INET) {
struct sockaddr_in *addr1 = net_sin(peer_addr);
struct sockaddr_in *addr2 =
net_sin(&context->tls->dtls_peer_addr);
return (addr1->sin_port == addr2->sin_port) &&
net_ipv4_addr_cmp(&addr1->sin_addr, &addr2->sin_addr);
}
return false;
}
static void dtls_peer_address_set(struct net_context *context,
const struct sockaddr *peer_addr,
socklen_t addrlen)
{
if (addrlen <= sizeof(context->tls->dtls_peer_addr)) {
memcpy(&context->tls->dtls_peer_addr, peer_addr, addrlen);
context->tls->dtls_peer_addrlen = addrlen;
}
}
static void dtls_peer_address_get(struct net_context *context,
struct sockaddr *peer_addr,
socklen_t *addrlen)
{
socklen_t len = MIN(context->tls->dtls_peer_addrlen, *addrlen);
memcpy(peer_addr, &context->tls->dtls_peer_addr, len);
*addrlen = len;
}
static int dtls_tx(void *ctx, const unsigned char *buf, size_t len)
{
struct net_context *net_ctx = ctx;
ssize_t sent;
sent = sock_fd_op_vtable.sendto(net_ctx, buf, len, net_ctx->tls->flags,
&net_ctx->tls->dtls_peer_addr,
net_ctx->tls->dtls_peer_addrlen);
if (sent < 0) {
if (errno == EAGAIN) {
return MBEDTLS_ERR_SSL_WANT_WRITE;
}
return MBEDTLS_ERR_NET_SEND_FAILED;
}
return sent;
}
static int dtls_rx(void *ctx, unsigned char *buf, size_t len, uint32_t timeout)
{
struct net_context *net_ctx = ctx;
bool is_block = !((net_ctx->tls->flags & ZSOCK_MSG_DONTWAIT) ||
sock_is_nonblock(net_ctx));
int remaining_time = (timeout == 0U) ? K_FOREVER : timeout;
u32_t entry_time = k_uptime_get_32();
socklen_t addrlen = sizeof(struct sockaddr);
struct sockaddr addr;
int err;
ssize_t received;
bool retry;
struct k_poll_event pev;
do {
retry = false;
/* mbedtLS does not allow blocking rx for DTLS, therefore use
* k_poll for timeout functionality.
*/
if (is_block) {
pev.obj = &net_ctx->recv_q;
pev.type = K_POLL_TYPE_FIFO_DATA_AVAILABLE;
pev.mode = K_POLL_MODE_NOTIFY_ONLY;
pev.state = K_POLL_STATE_NOT_READY;
if (k_poll(&pev, 1, remaining_time) == -EAGAIN) {
return MBEDTLS_ERR_SSL_TIMEOUT;
}
}
received = sock_fd_op_vtable.recvfrom(
net_ctx, buf, len, net_ctx->tls->flags,
&addr, &addrlen);
if (received < 0) {
if (errno == EAGAIN) {
return MBEDTLS_ERR_SSL_WANT_READ;
}
return MBEDTLS_ERR_NET_RECV_FAILED;
}
if (net_ctx->tls->dtls_peer_addrlen == 0) {
/* Only allow to store peer address for DTLS servers. */
if (net_ctx->tls->options.role
== MBEDTLS_SSL_IS_SERVER) {
dtls_peer_address_set(net_ctx, &addr, addrlen);
err = mbedtls_ssl_set_client_transport_id(
&net_ctx->tls->ssl,
(const unsigned char *)&addr, addrlen);
if (err < 0) {
return err;
}
} else {
/* For clients it's incorrect to receive when
* no peer has been set up.
*/
return MBEDTLS_ERR_SSL_PEER_VERIFY_FAILED;
}
} else if (!dtls_is_peer_addr_valid(net_ctx, &addr, addrlen)) {
/* Received data from different peer, ignore it. */
retry = true;
if (remaining_time != K_FOREVER) {
/* Recalculate the timeout value. */
remaining_time = time_left(entry_time, timeout);
if (remaining_time <= 0) {
return MBEDTLS_ERR_SSL_TIMEOUT;
}
}
}
} while (retry);
return received;
}
#endif /* CONFIG_NET_SOCKETS_ENABLE_DTLS */
static int tls_tx(void *ctx, const unsigned char *buf, size_t len)
{
struct net_context *net_ctx = ctx;
ssize_t sent;
sent = sock_fd_op_vtable.sendto(ctx, buf, len,
net_ctx->tls->flags, NULL, 0);
if (sent < 0) {
if (errno == EAGAIN) {
return MBEDTLS_ERR_SSL_WANT_WRITE;
}
return MBEDTLS_ERR_NET_SEND_FAILED;
}
return sent;
}
static int tls_rx(void *ctx, unsigned char *buf, size_t len)
{
struct net_context *net_ctx = ctx;
ssize_t received;
received = sock_fd_op_vtable.recvfrom(ctx, buf, len,
net_ctx->tls->flags, NULL, 0);
if (received < 0) {
if (errno == EAGAIN) {
return MBEDTLS_ERR_SSL_WANT_READ;
}
return MBEDTLS_ERR_NET_RECV_FAILED;
}
return received;
}
static int tls_add_ca_certificate(struct tls_context *tls,
struct tls_credential *ca_cert)
{
#if defined(MBEDTLS_X509_CRT_PARSE_C)
int err = mbedtls_x509_crt_parse(&tls->ca_chain,
ca_cert->buf, ca_cert->len);
if (err != 0) {
return -EINVAL;
}
return 0;
#endif /* MBEDTLS_X509_CRT_PARSE_C */
return -ENOTSUP;
}
static void tls_set_ca_chain(struct tls_context *tls)
{
#if defined(MBEDTLS_X509_CRT_PARSE_C)
mbedtls_ssl_conf_ca_chain(&tls->config, &tls->ca_chain, NULL);
mbedtls_ssl_conf_cert_profile(&tls->config,
&mbedtls_x509_crt_profile_default);
#endif /* MBEDTLS_X509_CRT_PARSE_C */
}
static int tls_set_own_cert(struct tls_context *tls,
struct tls_credential *own_cert,
struct tls_credential *priv_key)
{
#if defined(MBEDTLS_X509_CRT_PARSE_C)
int err = mbedtls_x509_crt_parse(&tls->own_cert,
own_cert->buf, own_cert->len);
if (err != 0) {
return -EINVAL;
}
err = mbedtls_pk_parse_key(&tls->priv_key, priv_key->buf,
priv_key->len, NULL, 0);
if (err != 0) {
return -EINVAL;
}
err = mbedtls_ssl_conf_own_cert(&tls->config, &tls->own_cert,
&tls->priv_key);
if (err != 0) {
err = -ENOMEM;
}
return 0;
#endif /* MBEDTLS_X509_CRT_PARSE_C */
return -ENOTSUP;
}
static int tls_set_psk(struct tls_context *tls,
struct tls_credential *psk,
struct tls_credential *psk_id)
{
#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED)
int err = mbedtls_ssl_conf_psk(&tls->config,
psk->buf, psk->len,
(const unsigned char *)psk_id->buf,
psk_id->len);
if (err != 0) {
return -EINVAL;
}
return 0;
#endif
return -ENOTSUP;
}
static int tls_set_credential(struct tls_context *tls,
struct tls_credential *cred)
{
switch (cred->type) {
case TLS_CREDENTIAL_CA_CERTIFICATE:
return tls_add_ca_certificate(tls, cred);
case TLS_CREDENTIAL_SERVER_CERTIFICATE:
{
struct tls_credential *priv_key =
credential_get(cred->tag, TLS_CREDENTIAL_PRIVATE_KEY);
if (!priv_key) {
return -ENOENT;
}
return tls_set_own_cert(tls, cred, priv_key);
}
case TLS_CREDENTIAL_PRIVATE_KEY:
/* Ignore private key - it will be used together
* with public certificate
*/
break;
case TLS_CREDENTIAL_PSK:
{
struct tls_credential *psk_id =
credential_get(cred->tag, TLS_CREDENTIAL_PSK_ID);
if (!psk_id) {
return -ENOENT;
}
return tls_set_psk(tls, cred, psk_id);
}
case TLS_CREDENTIAL_PSK_ID:
/* Ignore PSK ID - it will be used together
* with PSK
*/
break;
default:
return -EINVAL;
}
return 0;
}
static int tls_mbedtls_set_credentials(struct tls_context *tls)
{
struct tls_credential *cred;
sec_tag_t tag;
int i, err = 0;
bool tag_found, ca_cert_present = false;
credentials_lock();
for (i = 0; i < tls->options.sec_tag_list.sec_tag_count; i++) {
tag = tls->options.sec_tag_list.sec_tags[i];
cred = NULL;
tag_found = false;
while ((cred = credential_next_get(tag, cred)) != NULL) {
tag_found = true;
err = tls_set_credential(tls, cred);
if (err != 0) {
goto exit;
}
if (cred->type == TLS_CREDENTIAL_CA_CERTIFICATE) {
ca_cert_present = true;
}
}
if (!tag_found) {
err = -ENOENT;
goto exit;
}
}
exit:
credentials_unlock();
if (err == 0 && ca_cert_present) {
tls_set_ca_chain(tls);
}
return err;
}
static int tls_mbedtls_reset(struct net_context *context)
{
int ret;
ret = mbedtls_ssl_session_reset(&context->tls->ssl);
if (ret != 0) {
return ret;
}
k_sem_init(&context->tls->tls_established, 0, 1);
#if defined(CONFIG_NET_SOCKETS_ENABLE_DTLS)
(void)memset(&context->tls->dtls_peer_addr, 0,
sizeof(context->tls->dtls_peer_addr));
context->tls->dtls_peer_addrlen = 0;
#endif
return 0;
}
static int tls_mbedtls_handshake(struct net_context *context, bool block)
{
int ret;
while ((ret = mbedtls_ssl_handshake(&context->tls->ssl)) != 0) {
if (ret == MBEDTLS_ERR_SSL_WANT_READ ||
ret == MBEDTLS_ERR_SSL_WANT_WRITE) {
if (block) {
continue;
}
ret = -EAGAIN;
break;
} else if (ret == MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED) {
ret = tls_mbedtls_reset(context);
if (ret == 0) {
if (block) {
continue;
}
ret = -EAGAIN;
break;
}
}
NET_ERR("TLS handshake error: -%x", -ret);
ret = -ECONNABORTED;
break;
}
if (ret == 0) {
k_sem_give(&context->tls->tls_established);
}
return ret;
}
static int tls_mbedtls_init(struct net_context *context, bool is_server)
{
int role, type, ret;
role = is_server ? MBEDTLS_SSL_IS_SERVER : MBEDTLS_SSL_IS_CLIENT;
type = (net_context_get_type(context) == SOCK_STREAM) ?
MBEDTLS_SSL_TRANSPORT_STREAM :
MBEDTLS_SSL_TRANSPORT_DATAGRAM;
if (type == MBEDTLS_SSL_TRANSPORT_STREAM) {
mbedtls_ssl_set_bio(&context->tls->ssl, context,
tls_tx, tls_rx, NULL);
} else {
#if defined(CONFIG_NET_SOCKETS_ENABLE_DTLS)
mbedtls_ssl_set_bio(&context->tls->ssl, context,
dtls_tx, NULL, dtls_rx);
#else
return -ENOTSUP;
#endif /* CONFIG_NET_SOCKETS_ENABLE_DTLS */
}
ret = mbedtls_ssl_config_defaults(&context->tls->config, role, type,
MBEDTLS_SSL_PRESET_DEFAULT);
if (ret != 0) {
/* According to mbedTLS API documentation,
* mbedtls_ssl_config_defaults can fail due to memory
* allocation failure
*/
return -ENOMEM;
}
#if defined(CONFIG_NET_SOCKETS_ENABLE_DTLS)
if (type == MBEDTLS_SSL_TRANSPORT_DATAGRAM) {
/* DTLS requires timer callbacks to operate */
mbedtls_ssl_set_timer_cb(&context->tls->ssl,
&context->tls->dtls_timing,
dtls_timing_set_delay,
dtls_timing_get_delay);
/* Configure cookie for DTLS server */
if (role == MBEDTLS_SSL_IS_SERVER) {
ret = mbedtls_ssl_cookie_setup(&context->tls->cookie,
mbedtls_ctr_drbg_random,
&tls_ctr_drbg);
if (ret != 0) {
return -ENOMEM;
}
mbedtls_ssl_conf_dtls_cookies(&context->tls->config,
mbedtls_ssl_cookie_write,
mbedtls_ssl_cookie_check,
&context->tls->cookie);
mbedtls_ssl_conf_read_timeout(
&context->tls->config,
CONFIG_NET_SOCKETS_DTLS_TIMEOUT);
}
}
#endif /* CONFIG_NET_SOCKETS_ENABLE_DTLS */
#if defined(MBEDTLS_X509_CRT_PARSE_C)
/* For TLS clients, set hostname to empty string to enforce it's
* verification - only if hostname option was not set. Otherwise
* depend on user configuration.
*/
if (!is_server && !context->tls->options.is_hostname_set) {
mbedtls_ssl_set_hostname(&context->tls->ssl, "");
}
#endif
/* If verification level was specified explicitly, set it. Otherwise,
* use mbedTLS default values (required for client, none for server)
*/
if (context->tls->options.verify_level != -1) {
mbedtls_ssl_conf_authmode(&context->tls->config,
context->tls->options.verify_level);
}
mbedtls_ssl_conf_rng(&context->tls->config,
mbedtls_ctr_drbg_random,
&tls_ctr_drbg);
ret = tls_mbedtls_set_credentials(context->tls);
if (ret != 0) {
return ret;
}
ret = mbedtls_ssl_setup(&context->tls->ssl,
&context->tls->config);
if (ret != 0) {
/* According to mbedTLS API documentation,
* mbedtls_ssl_setup can fail due to memory allocation failure
*/
return -ENOMEM;
}
context->tls->is_initialized = true;
return 0;
}
static int tls_opt_sec_tag_list_set(struct net_context *context,
const void *optval, socklen_t optlen)
{
int sec_tag_cnt;
if (!optval) {
return -EINVAL;
}
if (optlen % sizeof(sec_tag_t) != 0) {
return -EINVAL;
}
sec_tag_cnt = optlen / sizeof(sec_tag_t);
if (sec_tag_cnt >
ARRAY_SIZE(context->tls->options.sec_tag_list.sec_tags)) {
return -EINVAL;
}
memcpy(context->tls->options.sec_tag_list.sec_tags, optval, optlen);
context->tls->options.sec_tag_list.sec_tag_count = sec_tag_cnt;
return 0;
}
static int tls_opt_sec_tag_list_get(struct net_context *context,
void *optval, socklen_t *optlen)
{
int len;
if (*optlen % sizeof(sec_tag_t) != 0 || *optlen == 0) {
return -EINVAL;
}
len = MIN(context->tls->options.sec_tag_list.sec_tag_count *
sizeof(sec_tag_t), *optlen);
memcpy(optval, context->tls->options.sec_tag_list.sec_tags, len);
*optlen = len;
return 0;
}
static int tls_opt_hostname_set(struct net_context *context,
const void *optval, socklen_t optlen)
{
ARG_UNUSED(optlen);
#if defined(MBEDTLS_X509_CRT_PARSE_C)
if (mbedtls_ssl_set_hostname(&context->tls->ssl, optval) != 0) {
return -EINVAL;
}
#else
return -ENOPROTOOPT;
#endif
context->tls->options.is_hostname_set = true;
return 0;
}
static int tls_opt_ciphersuite_list_set(struct net_context *context,
const void *optval, socklen_t optlen)
{
int cipher_cnt;
if (!optval) {
return -EINVAL;
}
if (optlen % sizeof(int) != 0) {
return -EINVAL;
}
cipher_cnt = optlen / sizeof(int);
/* + 1 for 0-termination. */
if (cipher_cnt + 1 > ARRAY_SIZE(context->tls->options.ciphersuites)) {
return -EINVAL;
}
memcpy(context->tls->options.ciphersuites, optval, optlen);
context->tls->options.ciphersuites[cipher_cnt] = 0;
return 0;
}
static int tls_opt_ciphersuite_list_get(struct net_context *context,
void *optval, socklen_t *optlen)
{
const int *selected_ciphers;
int cipher_cnt, i = 0;
int *ciphers = optval;
if (*optlen % sizeof(int) != 0 || *optlen == 0) {
return -EINVAL;
}
if (context->tls->options.ciphersuites[0] == 0) {
/* No specific ciphersuites configured, return all available. */
selected_ciphers = mbedtls_ssl_list_ciphersuites();
} else {
selected_ciphers = context->tls->options.ciphersuites;
}
cipher_cnt = *optlen / sizeof(int);
while (selected_ciphers[i] != 0) {
ciphers[i] = selected_ciphers[i];
if (++i == cipher_cnt) {
break;
}
}
*optlen = i * sizeof(int);
return 0;
}
static int tls_opt_ciphersuite_used_get(struct net_context *context,
void *optval, socklen_t *optlen)
{
const char *ciph;
if (*optlen != sizeof(int)) {
return -EINVAL;
}
ciph = mbedtls_ssl_get_ciphersuite(&context->tls->ssl);
if (ciph == NULL) {
return -ENOTCONN;
}
*(int *)optval = mbedtls_ssl_get_ciphersuite_id(ciph);
return 0;
}
static int tls_opt_peer_verify_set(struct net_context *context,
const void *optval, socklen_t optlen)
{
int *peer_verify;
if (!optval) {
return -EINVAL;
}
if (optlen != sizeof(int)) {
return -EINVAL;
}
peer_verify = (int *)optval;
if (*peer_verify != MBEDTLS_SSL_VERIFY_NONE &&
*peer_verify != MBEDTLS_SSL_VERIFY_OPTIONAL &&
*peer_verify != MBEDTLS_SSL_VERIFY_REQUIRED) {
return -EINVAL;
}
context->tls->options.verify_level = *peer_verify;
return 0;
}
static int tls_opt_dtls_role_set(struct net_context *context,
const void *optval, socklen_t optlen)
{
int *role;
if (!optval) {
return -EINVAL;
}
if (optlen != sizeof(int)) {
return -EINVAL;
}
role = (int *)optval;
if (*role != MBEDTLS_SSL_IS_CLIENT &&
*role != MBEDTLS_SSL_IS_SERVER) {
return -EINVAL;
}
context->tls->options.role = *role;
return 0;
}
int ztls_socket(int family, int type, int proto)
{
enum net_ip_protocol_secure tls_proto = 0;
int fd = z_reserve_fd();
int ret;
struct net_context *ctx;
if (fd < 0) {
return -1;
}
if (proto >= IPPROTO_TLS_1_0 && proto <= IPPROTO_TLS_1_2) {
if (type != SOCK_STREAM) {
errno = EPROTOTYPE;
return -1;
}
tls_proto = proto;
proto = IPPROTO_TCP;
} else if (proto >= IPPROTO_DTLS_1_0 && proto <= IPPROTO_DTLS_1_2) {
#if !defined(CONFIG_NET_SOCKETS_ENABLE_DTLS)
errno = EPROTONOSUPPORT;
return -1;
#else
if (type != SOCK_DGRAM) {
errno = EPROTOTYPE;
return -1;
}
tls_proto = proto;
proto = IPPROTO_UDP;
#endif
}
ret = net_context_get(family, type, proto, &ctx);
if (ret < 0) {
z_free_fd(fd);
errno = -ret;
return -1;
}
/* Initialize user_data, all other calls will preserve it */
ctx->user_data = NULL;
/* recv_q and accept_q are in union */
k_fifo_init(&ctx->recv_q);
#ifdef CONFIG_USERSPACE
/* Set net context object as initialized and grant access to the
* calling thread (and only the calling thread)
*/
z_object_recycle(ctx);
#endif
if (tls_proto != 0) {
/* If TLS protocol is used, allocate TLS context */
ctx->tls = tls_alloc();
if (ctx->tls == NULL) {
z_free_fd(fd);
(void)net_context_put(ctx);
errno = ENOMEM;
return -1;
}
ctx->tls->tls_version = tls_proto;
}
z_finalize_fd(
fd, ctx, (const struct fd_op_vtable *)&tls_sock_fd_op_vtable);
return fd;
}
int ztls_close_ctx(struct net_context *ctx)
{
int ret, err = 0;
if (ctx->tls != NULL) {
/* Try to send close notification. */
ctx->tls->flags = 0;
(void)mbedtls_ssl_close_notify(&ctx->tls->ssl);
err = tls_release(ctx->tls);
} else {
err = -EBADF;
}
ret = z_fdtable_call_ioctl(&sock_fd_op_vtable.fd_vtable, ctx, ZFD_IOCTL_CLOSE);
/* In case close fails, we propagate errno value set by close.
* In case close succeeds, but tls_release fails, set errno
* according to tls_release return value.
*/
if (ret == 0 && err < 0) {
errno = -err;
ret = -1;
}
return ret;
}
int ztls_connect_ctx(struct net_context *ctx, const struct sockaddr *addr,
socklen_t addrlen)
{
int ret;
if (ctx->tls == NULL) {
errno = EBADF;
return -1;
}
ret = sock_fd_op_vtable.connect(ctx, addr, addrlen);
if (ret < 0) {
return ret;
}
if (net_context_get_type(ctx) == SOCK_STREAM) {
/* Do the handshake for TLS, not DTLS. */
ret = tls_mbedtls_init(ctx, false);
if (ret < 0) {
goto error;
}
/* Do not use any socket flags during the handshake. */
ctx->tls->flags = 0;
/* TODO For simplicity, TLS handshake blocks the socket
* even for non-blocking socket.
*/
ret = tls_mbedtls_handshake(ctx, true);
if (ret < 0) {
goto error;
}
} else {
#if defined(CONFIG_NET_SOCKETS_ENABLE_DTLS)
/* Just store the address. */
dtls_peer_address_set(ctx, addr, addrlen);
#else
ret = -ENOTSUP;
goto error;
#endif /* CONFIG_NET_SOCKETS_ENABLE_DTLS */
}
return 0;
error:
errno = -ret;
return -1;
}
int ztls_accept_ctx(struct net_context *parent, struct sockaddr *addr,
socklen_t *addrlen)
{
int ret, err, fd;
struct net_context *child;
if (parent->tls == NULL) {
errno = EBADF;
return -1;
}
fd = z_reserve_fd();
if (fd < 0) {
return -1;
}
child = k_fifo_get(&parent->accept_q, K_FOREVER);
#ifdef CONFIG_USERSPACE
z_object_recycle(child);
#endif
if (addr != NULL && addrlen != NULL) {
int len = MIN(*addrlen, sizeof(child->remote));
memcpy(addr, &child->remote, len);
/* addrlen is a value-result argument, set to actual
* size of source address
*/
if (child->remote.sa_family == AF_INET) {
*addrlen = sizeof(struct sockaddr_in);
} else if (child->remote.sa_family == AF_INET6) {
*addrlen = sizeof(struct sockaddr_in6);
} else {
ret = -ENOTSUP;
goto error;
}
}
z_finalize_fd(
fd, child, (const struct fd_op_vtable *)&tls_sock_fd_op_vtable);
child->tls = tls_clone(parent->tls);
if (!child->tls) {
ret = -ENOMEM;
goto error;
}
ret = tls_mbedtls_init(child, true);
if (ret < 0) {
goto error;
}
/* Do not use any socket flags during the handshake. */
child->tls->flags = 0;
/* TODO For simplicity, TLS handshake blocks the socket even for
* non-blocking socket.
*/
ret = tls_mbedtls_handshake(child, true);
if (ret < 0) {
goto error;
}
return fd;
error:
if (child->tls != NULL) {
err = tls_release(child->tls);
__ASSERT(err == 0, "TLS context release failed");
}
err = z_fdtable_call_ioctl(&sock_fd_op_vtable.fd_vtable, child, ZFD_IOCTL_CLOSE);
__ASSERT(err == 0, "Child socket close failed");
z_free_fd(fd);
errno = -ret;
return -1;
}
static ssize_t send_tls(struct net_context *ctx, const void *buf,
size_t len, int flags)
{
int ret;
ret = mbedtls_ssl_write(&ctx->tls->ssl, buf, len);
if (ret >= 0) {
return ret;
}
if (ret == MBEDTLS_ERR_SSL_WANT_READ ||
ret == MBEDTLS_ERR_SSL_WANT_WRITE) {
errno = EAGAIN;
} else {
errno = EIO;
}
return -1;
}
#if defined(CONFIG_NET_SOCKETS_ENABLE_DTLS)
static ssize_t sendto_dtls_client(struct net_context *ctx, const void *buf,
size_t len, int flags,
const struct sockaddr *dest_addr,
socklen_t addrlen)
{
int ret;
if (!dest_addr) {
/* No address provided, check if we have stored one,
* otherwise return error.
*/
if (ctx->tls->dtls_peer_addrlen == 0) {
ret = -EDESTADDRREQ;
goto error;
}
} else if (ctx->tls->dtls_peer_addrlen == 0) {
/* Address provided and no peer address stored. */
dtls_peer_address_set(ctx, dest_addr, addrlen);
} else if (!dtls_is_peer_addr_valid(ctx, dest_addr, addrlen) != 0) {
/* Address provided but it does not match stored one */
ret = -EISCONN;
goto error;
}
if (!ctx->tls->is_initialized) {
ret = tls_mbedtls_init(ctx, false);
if (ret < 0) {
goto error;
}
}
if (!is_handshake_complete(ctx)) {
/* TODO For simplicity, TLS handshake blocks the socket even for
* non-blocking socket.
*/
ret = tls_mbedtls_handshake(ctx, true);
if (ret < 0) {
goto error;
}
}
return send_tls(ctx, buf, len, flags);
error:
errno = -ret;
return -1;
}
static ssize_t sendto_dtls_server(struct net_context *ctx, const void *buf,
size_t len, int flags,
const struct sockaddr *dest_addr,
socklen_t addrlen)
{
/* For DTLS server, require to have established DTLS connection
* in order to send data.
*/
if (!is_handshake_complete(ctx)) {
errno = ENOTCONN;
return -1;
}
/* Verify we are sending to a peer that we have connection with. */
if (dest_addr &&
!dtls_is_peer_addr_valid(ctx, dest_addr, addrlen) != 0) {
errno = EISCONN;
return -1;
}
return send_tls(ctx, buf, len, flags);
}
#endif /* CONFIG_NET_SOCKETS_ENABLE_DTLS */
ssize_t ztls_sendto_ctx(struct net_context *ctx, const void *buf, size_t len,
int flags, const struct sockaddr *dest_addr,
socklen_t addrlen)
{
if (ctx->tls == NULL) {
errno = EBADF;
return -1;
}
ctx->tls->flags = flags;
/* TLS */
if (net_context_get_type(ctx) == SOCK_STREAM) {
return send_tls(ctx, buf, len, flags);
}
#if defined(CONFIG_NET_SOCKETS_ENABLE_DTLS)
/* DTLS */
if (ctx->tls->options.role == MBEDTLS_SSL_IS_SERVER) {
return sendto_dtls_server(ctx, buf, len, flags,
dest_addr, addrlen);
}
return sendto_dtls_client(ctx, buf, len, flags, dest_addr, addrlen);
#else
errno = ENOTSUP;
return -1;
#endif /* CONFIG_NET_SOCKETS_ENABLE_DTLS */
}
static ssize_t recv_tls(struct net_context *ctx, void *buf,
size_t max_len, int flags)
{
int ret;
ret = mbedtls_ssl_read(&ctx->tls->ssl, buf, max_len);
if (ret >= 0) {
return ret;
}
if (ret == MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY) {
/* Peer notified that it's closing the connection. */
return 0;
}
if (ret == MBEDTLS_ERR_SSL_CLIENT_RECONNECT) {
/* Client reconnect on the same socket is not
* supported. See mbedtls_ssl_read API documentation.
*/
return 0;
}
if (ret == MBEDTLS_ERR_SSL_WANT_READ ||
ret == MBEDTLS_ERR_SSL_WANT_WRITE) {
ret = -EAGAIN;
} else {
ret = -EIO;
}
errno = -ret;
return -1;
}
#if defined(CONFIG_NET_SOCKETS_ENABLE_DTLS)
static ssize_t recvfrom_dtls_client(struct net_context *ctx, void *buf,
size_t max_len, int flags,
struct sockaddr *src_addr,
socklen_t *addrlen)
{
int ret;
if (!is_handshake_complete(ctx)) {
ret = -ENOTCONN;
goto error;
}
ret = mbedtls_ssl_read(&ctx->tls->ssl, buf, max_len);
if (ret >= 0) {
if (src_addr && addrlen) {
dtls_peer_address_get(ctx, src_addr, addrlen);
}
return ret;
}
switch (ret) {
case MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY:
/* Peer notified that it's closing the connection. */
return 0;
case MBEDTLS_ERR_SSL_TIMEOUT:
(void)mbedtls_ssl_close_notify(&ctx->tls->ssl);
ret = -ETIMEDOUT;
break;
case MBEDTLS_ERR_SSL_WANT_READ:
case MBEDTLS_ERR_SSL_WANT_WRITE:
ret = -EAGAIN;
break;
default:
ret = -EIO;
break;
}
error:
errno = -ret;
return -1;
}
static ssize_t recvfrom_dtls_server(struct net_context *ctx, void *buf,
size_t max_len, int flags,
struct sockaddr *src_addr,
socklen_t *addrlen)
{
int ret;
bool repeat;
bool is_block = !((flags & ZSOCK_MSG_DONTWAIT) ||
sock_is_nonblock(ctx));
if (!ctx->tls->is_initialized) {
ret = tls_mbedtls_init(ctx, true);
if (ret < 0) {
goto error;
}
}
/* Loop to enable DTLS reconnection for servers without closing
* a socket.
*/
do {
repeat = false;
if (!is_handshake_complete(ctx)) {
ret = tls_mbedtls_handshake(ctx, is_block);
if (ret < 0) {
/* In case of EAGAIN, just exit. */
if (ret == -EAGAIN) {
break;
}
ret = tls_mbedtls_reset(ctx);
if (ret == 0) {
repeat = true;
} else {
ret = -ECONNABORTED;
}
continue;
}
}
ret = mbedtls_ssl_read(&ctx->tls->ssl, buf, max_len);
if (ret >= 0) {
if (src_addr && addrlen) {
dtls_peer_address_get(ctx, src_addr, addrlen);
}
return ret;
}
switch (ret) {
case MBEDTLS_ERR_SSL_TIMEOUT:
(void)mbedtls_ssl_close_notify(&ctx->tls->ssl);
/* fallthrough */
case MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY:
case MBEDTLS_ERR_SSL_CLIENT_RECONNECT:
ret = tls_mbedtls_reset(ctx);
if (ret == 0) {
repeat = true;
} else {
ret = -ECONNABORTED;
}
break;
case MBEDTLS_ERR_SSL_WANT_READ:
case MBEDTLS_ERR_SSL_WANT_WRITE:
ret = -EAGAIN;
break;
default:
ret = -EIO;
break;
}
} while (repeat);
error:
errno = -ret;
return -1;
}
#endif /* CONFIG_NET_SOCKETS_ENABLE_DTLS */
ssize_t ztls_recvfrom_ctx(struct net_context *ctx, void *buf, size_t max_len,
int flags, struct sockaddr *src_addr,
socklen_t *addrlen)
{
if (ctx->tls == NULL) {
errno = EBADF;
return -1;
}
if (flags & ZSOCK_MSG_PEEK) {
/* TODO mbedTLS does not support 'peeking' This could be
* bypassed by having intermediate buffer for peeking
*/
errno = ENOTSUP;
return -1;
}
ctx->tls->flags = flags;
/* TLS */
if (net_context_get_type(ctx) == SOCK_STREAM) {
return recv_tls(ctx, buf, max_len, flags);
}
#if defined(CONFIG_NET_SOCKETS_ENABLE_DTLS)
/* DTLS */
if (ctx->tls->options.role == MBEDTLS_SSL_IS_SERVER) {
return recvfrom_dtls_server(ctx, buf, max_len, flags,
src_addr, addrlen);
}
return recvfrom_dtls_client(ctx, buf, max_len, flags,
src_addr, addrlen);
#else
errno = ENOTSUP;
return -1;
#endif /* CONFIG_NET_SOCKETS_ENABLE_DTLS */
}
static int ztls_poll_prepare_ctx(struct net_context *ctx,
struct zsock_pollfd *pfd,
struct k_poll_event **pev,
struct k_poll_event *pev_end)
{
if (ctx->tls == NULL) {
/* POLLNVAL flag will be set in the update function. */
return 0;
}
if (pfd->events & ZSOCK_POLLIN) {
if (*pev == pev_end) {
errno = ENOMEM;
return -1;
}
/* DTLS client should wait for the handshake to complete before
* it actually starts to poll for data.
*/
if (net_context_get_type(ctx) == SOCK_DGRAM &&
ctx->tls->options.role == MBEDTLS_SSL_IS_CLIENT &&
!is_handshake_complete(ctx)) {
(*pev)->obj = &ctx->tls->tls_established;
(*pev)->type = K_POLL_TYPE_SEM_AVAILABLE;
} else {
/* Otherwise, monitor fifo for data/connections. */
(*pev)->obj = &ctx->recv_q;
(*pev)->type = K_POLL_TYPE_FIFO_DATA_AVAILABLE;
}
(*pev)->mode = K_POLL_MODE_NOTIFY_ONLY;
(*pev)->state = K_POLL_STATE_NOT_READY;
(*pev)++;
/* If socket is already in EOF, it can be reported
* immediately, so we tell poll() to short-circuit wait.
*/
if (sock_is_eof(ctx)) {
errno = EALREADY;
return -1;
}
/* If there already is mbedTLS data to read, there is no
* need to set the k_poll_event object. Return EALREADY
* so we won't block in the k_poll.
*/
if (!IS_LISTENING(ctx)) {
if (mbedtls_ssl_get_bytes_avail(&ctx->tls->ssl) > 0) {
errno = EALREADY;
return -1;
}
}
}
return 0;
}
static int ztls_poll_update_ctx(struct net_context *ctx,
struct zsock_pollfd *pfd,
struct k_poll_event **pev)
{
if (ctx->tls == NULL) {
pfd->revents = ZSOCK_POLLNVAL;
return 0;
}
/* For now, assume that socket is always writable */
if (pfd->events & ZSOCK_POLLOUT) {
pfd->revents |= ZSOCK_POLLOUT;
}
if (pfd->events & ZSOCK_POLLIN) {
/* Check if socket was waiting for the handshake to complete. */
if ((*pev)->obj == &ctx->tls->tls_established) {
if ((*pev)->state == K_POLL_STATE_NOT_READY) {
goto next;
}
/* Reconfigure the poll event to wait for data now. */
(*pev)->obj = &ctx->recv_q;
(*pev)->type = K_POLL_TYPE_FIFO_DATA_AVAILABLE;
(*pev)->mode = K_POLL_MODE_NOTIFY_ONLY;
(*pev)->state = K_POLL_STATE_NOT_READY;
goto again;
}
if (sock_is_eof(ctx)) {
pfd->revents |= ZSOCK_POLLIN;
goto next;
}
if (!IS_LISTENING(ctx)) {
/* Already had TLS data to read on socket. */
if (mbedtls_ssl_get_bytes_avail(&ctx->tls->ssl) > 0) {
pfd->revents |= ZSOCK_POLLIN;
goto next;
}
}
/* Some encrypted data received on the socket. */
if ((*pev)->state != K_POLL_STATE_NOT_READY) {
if (IS_LISTENING(ctx)) {
pfd->revents |= ZSOCK_POLLIN;
goto next;
}
/* EAGAIN might happen during or just after
* DTLS handshake.
*/
if (recv(pfd->fd, NULL, 0, ZSOCK_MSG_DONTWAIT) < 0 &&
errno != EAGAIN) {
pfd->revents |= ZSOCK_POLLERR;
goto next;
}
if (mbedtls_ssl_get_bytes_avail(&ctx->tls->ssl) > 0 ||
sock_is_eof(ctx)) {
pfd->revents |= ZSOCK_POLLIN;
goto next;
}
/* Received encrypted data, but still not enough
* to decrypt it and return data through socket,
* ask for retry.
*/
(*pev)->state = K_POLL_STATE_NOT_READY;
goto again;
}
goto next;
}
return 0;
next:
(*pev)++;
return 0;
again:
(*pev)++;
errno = EAGAIN;
return -1;
}
int ztls_getsockopt_ctx(struct net_context *ctx, int level, int optname,
void *optval, socklen_t *optlen)
{
int err;
if (!ctx->tls) {
errno = EBADF;
return -1;
}
if (!optval || !optlen) {
errno = EINVAL;
return -1;
}
if (level != SOL_TLS) {
return sock_fd_op_vtable.getsockopt(ctx, level, optname,
optval, optlen);
}
switch (optname) {
case TLS_SEC_TAG_LIST:
err = tls_opt_sec_tag_list_get(ctx, optval, optlen);
break;
case TLS_CIPHERSUITE_LIST:
err = tls_opt_ciphersuite_list_get(ctx, optval, optlen);
break;
case TLS_CIPHERSUITE_USED:
err = tls_opt_ciphersuite_used_get(ctx, optval, optlen);
break;
default:
/* Unknown or write-only option. */
err = -ENOPROTOOPT;
break;
}
if (err < 0) {
errno = -err;
return -1;
}
return 0;
}
int ztls_setsockopt_ctx(struct net_context *ctx, int level, int optname,
const void *optval, socklen_t optlen)
{
int err;
if (!ctx->tls) {
errno = EBADF;
return -1;
}
if (level != SOL_TLS) {
return sock_fd_op_vtable.setsockopt(ctx, level, optname,
optval, optlen);
}
switch (optname) {
case TLS_SEC_TAG_LIST:
err = tls_opt_sec_tag_list_set(ctx, optval, optlen);
break;
case TLS_HOSTNAME:
err = tls_opt_hostname_set(ctx, optval, optlen);
break;
case TLS_CIPHERSUITE_LIST:
err = tls_opt_ciphersuite_list_set(ctx, optval, optlen);
break;
case TLS_PEER_VERIFY:
err = tls_opt_peer_verify_set(ctx, optval, optlen);
break;
case TLS_DTLS_ROLE:
err = tls_opt_dtls_role_set(ctx, optval, optlen);
break;
default:
/* Unknown or read-only option. */
err = -ENOPROTOOPT;
break;
}
if (err < 0) {
errno = -err;
return -1;
}
return 0;
}
static ssize_t tls_sock_read_vmeth(void *obj, void *buffer, size_t count)
{
return ztls_recvfrom_ctx(obj, buffer, count, 0, NULL, 0);
}
static ssize_t tls_sock_write_vmeth(void *obj, const void *buffer,
size_t count)
{
return ztls_sendto_ctx(obj, buffer, count, 0, NULL, 0);
}
static int tls_sock_ioctl_vmeth(void *obj, unsigned int request, va_list args)
{
switch (request) {
/* fcntl() commands */
case F_GETFL:
case F_SETFL:
/* Pass the call to the core socket implementation. */
return sock_fd_op_vtable.fd_vtable.ioctl(obj, request, args);
case ZFD_IOCTL_CLOSE:
return ztls_close_ctx(obj);
case ZFD_IOCTL_POLL_PREPARE: {
struct zsock_pollfd *pfd;
struct k_poll_event **pev;
struct k_poll_event *pev_end;
pfd = va_arg(args, struct zsock_pollfd *);
pev = va_arg(args, struct k_poll_event **);
pev_end = va_arg(args, struct k_poll_event *);
return ztls_poll_prepare_ctx(obj, pfd, pev, pev_end);
}
case ZFD_IOCTL_POLL_UPDATE: {
struct zsock_pollfd *pfd;
struct k_poll_event **pev;
pfd = va_arg(args, struct zsock_pollfd *);
pev = va_arg(args, struct k_poll_event **);
return ztls_poll_update_ctx(obj, pfd, pev);
}
default:
errno = EOPNOTSUPP;
return -1;
}
}
static int tls_sock_bind_vmeth(void *obj, const struct sockaddr *addr,
socklen_t addrlen)
{
return sock_fd_op_vtable.bind(obj, addr, addrlen);
}
static int tls_sock_connect_vmeth(void *obj, const struct sockaddr *addr,
socklen_t addrlen)
{
return ztls_connect_ctx(obj, addr, addrlen);
}
static int tls_sock_listen_vmeth(void *obj, int backlog)
{
return sock_fd_op_vtable.listen(obj, backlog);
}
static int tls_sock_accept_vmeth(void *obj, struct sockaddr *addr,
socklen_t *addrlen)
{
return ztls_accept_ctx(obj, addr, addrlen);
}
static ssize_t tls_sock_sendto_vmeth(void *obj, const void *buf, size_t len,
int flags,
const struct sockaddr *dest_addr,
socklen_t addrlen)
{
return ztls_sendto_ctx(obj, buf, len, flags, dest_addr, addrlen);
}
static ssize_t tls_sock_recvfrom_vmeth(void *obj, void *buf, size_t max_len,
int flags, struct sockaddr *src_addr,
socklen_t *addrlen)
{
return ztls_recvfrom_ctx(obj, buf, max_len, flags,
src_addr, addrlen);
}
static int tls_sock_getsockopt_vmeth(void *obj, int level, int optname,
void *optval, socklen_t *optlen)
{
return ztls_getsockopt_ctx(obj, level, optname, optval, optlen);
}
static int tls_sock_setsockopt_vmeth(void *obj, int level, int optname,
const void *optval, socklen_t optlen)
{
return ztls_setsockopt_ctx(obj, level, optname, optval, optlen);
}
static const struct socket_op_vtable tls_sock_fd_op_vtable = {
.fd_vtable = {
.read = tls_sock_read_vmeth,
.write = tls_sock_write_vmeth,
.ioctl = tls_sock_ioctl_vmeth,
},
.bind = tls_sock_bind_vmeth,
.connect = tls_sock_connect_vmeth,
.listen = tls_sock_listen_vmeth,
.accept = tls_sock_accept_vmeth,
.sendto = tls_sock_sendto_vmeth,
.recvfrom = tls_sock_recvfrom_vmeth,
.getsockopt = tls_sock_getsockopt_vmeth,
.setsockopt = tls_sock_setsockopt_vmeth,
};
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