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mbedtls: fix ssl server crash when enable mbedtls dynamic buffer

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Not free keycert until MBEDTLS_SSL_CLIENT_KEY_EXCHANGE for rsa key exchange methods, because keycert will be used to parse client key exchange.
This commit is contained in:
Li Jingyi 2022-04-22 17:28:37 +08:00 committed by BOT
parent 49bfb8491f
commit 24feccbd80
1 changed files with 45 additions and 3 deletions
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48
components/mbedtls/port/dynamic/esp_ssl_srv.c
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@ -12,6 +12,24 @@ int __wrap_mbedtls_ssl_handshake_server_step(mbedtls_ssl_context *ssl);
static const char *TAG = "SSL Server";
#ifdef CONFIG_MBEDTLS_DYNAMIC_FREE_CONFIG_DATA
/**
* Check if ciphersuite uses rsa key exchange methods.
*/
static bool ssl_ciphersuite_uses_rsa_key_ex(mbedtls_ssl_context *ssl)
{
const mbedtls_ssl_ciphersuite_t *ciphersuite_info =
ssl->handshake->ciphersuite_info;
if (ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA ||
ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK) {
return true;
} else {
return false;
}
}
#endif
static int manage_resource(mbedtls_ssl_context *ssl, bool add)
{
int state = add ? ssl->state : ssl->state - 1;
@ -65,7 +83,13 @@ static int manage_resource(mbedtls_ssl_context *ssl, bool add)
CHECK_OK(esp_mbedtls_add_tx_buffer(ssl, buffer_len));
} else {
#ifdef CONFIG_MBEDTLS_DYNAMIC_FREE_CONFIG_DATA
esp_mbedtls_free_keycert_cert(ssl);
/**
* Not free keycert->cert until MBEDTLS_SSL_CLIENT_KEY_EXCHANGE for rsa key exchange methods.
* For ssl server will use keycert->cert to parse client key exchange.
*/
if (!ssl_ciphersuite_uses_rsa_key_ex(ssl)) {
esp_mbedtls_free_keycert_cert(ssl);
}
#endif
}
break;
@ -77,8 +101,14 @@ static int manage_resource(mbedtls_ssl_context *ssl, bool add)
} else {
#ifdef CONFIG_MBEDTLS_DYNAMIC_FREE_CONFIG_DATA
esp_mbedtls_free_dhm(ssl);
esp_mbedtls_free_keycert_key(ssl);
esp_mbedtls_free_keycert(ssl);
/**
* Not free keycert->key and keycert until MBEDTLS_SSL_CLIENT_KEY_EXCHANGE for rsa key exchange methods.
* For ssl server will use keycert->key to parse client key exchange.
*/
if (!ssl_ciphersuite_uses_rsa_key_ex(ssl)) {
esp_mbedtls_free_keycert_key(ssl);
esp_mbedtls_free_keycert(ssl);
}
#endif
}
break;
@ -114,6 +144,18 @@ static int manage_resource(mbedtls_ssl_context *ssl, bool add)
CHECK_OK(esp_mbedtls_add_rx_buffer(ssl));
} else {
CHECK_OK(esp_mbedtls_free_rx_buffer(ssl));
#ifdef CONFIG_MBEDTLS_DYNAMIC_FREE_CONFIG_DATA
/**
* Free keycert after MBEDTLS_SSL_CLIENT_KEY_EXCHANGE for rsa key exchange methods.
* For ssl server will use keycert->cert and keycert->key to parse client key exchange.
*/
if (ssl_ciphersuite_uses_rsa_key_ex(ssl)) {
esp_mbedtls_free_keycert_cert(ssl);
esp_mbedtls_free_keycert_key(ssl);
esp_mbedtls_free_keycert(ssl);
}
#endif
}
break;
case MBEDTLS_SSL_CERTIFICATE_VERIFY: