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/*
* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License").
* You may not use this file except in compliance with the License.
* A copy of the License is located at
*
* http://aws.amazon.com/apache2.0
*
* or in the "license" file accompanying this file. This file is distributed
* on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
* express or implied. See the License for the specific language governing
* permissions and limitations under the License.
*/
#pragma once
#include <sys/param.h>
#include "api/s2n.h"
#include "crypto/s2n_certificate.h"
#include "crypto/s2n_dhe.h"
#include "tls/s2n_crl.h"
#include "tls/s2n_key_update.h"
#include "tls/s2n_psk.h"
#include "tls/s2n_record.h"
#include "tls/s2n_renegotiate.h"
#include "tls/s2n_resume.h"
#include "tls/s2n_tls_parameters.h"
#include "tls/s2n_x509_validator.h"
#include "utils/s2n_blob.h"
#include "utils/s2n_set.h"
#define S2N_MAX_TICKET_KEYS 48
#define S2N_MAX_TICKET_KEY_HASHES 500 /* 10KB */
/*
* TLS1.3 does not allow alert messages to be fragmented, and some TLS
* implementations (for example, GnuTLS) reject fragmented TLS1.2 alerts.
* The send buffer must be able to hold an unfragmented alert message.
*
* We choose not to fragment KeyUpdate messages to keep our post-handshake
* fragmentation logic simple and consistent across message types.
* The send buffer must be able to hold an unfragmented KeyUpdate message.
*/
#define S2N_MIN_SEND_BUFFER_FRAGMENT_SIZE MAX(S2N_KEY_UPDATE_MESSAGE_SIZE, S2N_ALERT_LENGTH)
#define S2N_MIN_SEND_BUFFER_SIZE S2N_TLS_MAX_RECORD_LEN_FOR(S2N_MIN_SEND_BUFFER_FRAGMENT_SIZE)
struct s2n_cipher_preferences;
typedef enum {
S2N_NOT_OWNED = 0,
S2N_APP_OWNED,
S2N_LIB_OWNED,
} s2n_cert_ownership;
struct s2n_config {
unsigned use_tickets : 1;
/* Whether a connection can be used by a QUIC implementation.
* See s2n_quic_support.h */
unsigned quic_enabled : 1;
unsigned default_certs_are_explicit : 1;
unsigned use_session_cache : 1;
/* if this is FALSE, server will ignore client's Maximum Fragment Length request */
unsigned accept_mfl : 1;
unsigned check_ocsp : 1;
unsigned disable_x509_validation : 1;
unsigned max_verify_cert_chain_depth_set : 1;
/* Whether to add dss cert type during a server certificate request.
* See https://github.com/aws/s2n-tls/blob/main/docs/USAGE-GUIDE.md */
unsigned cert_req_dss_legacy_compat_enabled : 1;
/* Whether any RSA certificates have been configured server-side to send to clients. This is needed so that the
* server knows whether or not to self-downgrade to TLS 1.2 if the server is compiled with Openssl 1.0.2 and does
* not support RSA PSS signing (which is required for TLS 1.3). */
unsigned is_rsa_cert_configured : 1;
/* It's possible to use a certificate without loading the private key,
* but async signing must be enabled. Use this flag to enforce that restriction.
*/
unsigned no_signing_key : 1;
/*
* Whether to verify signatures locally before sending them over the wire.
* See s2n_config_set_verify_after_sign.
*/
unsigned verify_after_sign : 1;
/* Indicates support for the npn extension */
unsigned npn_supported : 1;
/* Indicates s2n_recv should read as much as it can into the output buffer
*
* Note: This defaults to false to ensure backwards compatability with
* applications which relied on s2n_recv returning a single record.
*/
unsigned recv_multi_record : 1;
/* Indicates whether the user has enabled OCSP status requests */
unsigned ocsp_status_requested_by_user : 1;
/* Indicates whether s2n has enabled OCSP status requests, for backwards compatibility */
unsigned ocsp_status_requested_by_s2n : 1;
struct s2n_dh_params *dhparams;
/* Needed until we can deprecate s2n_config_add_cert_chain_and_key. This is
* used to release memory allocated only in the deprecated API that the application
* does not have a reference to. */
struct s2n_map *domain_name_to_cert_map;
struct certs_by_type default_certs_by_type;
struct s2n_blob application_protocols;
s2n_clock_time_nanoseconds wall_clock;
s2n_clock_time_nanoseconds monotonic_clock;
const struct s2n_security_policy *security_policy;
void *sys_clock_ctx;
void *monotonic_clock_ctx;
s2n_client_hello_fn *client_hello_cb;
s2n_client_hello_cb_mode client_hello_cb_mode;
void *client_hello_cb_ctx;
uint64_t session_state_lifetime_in_nanos;
struct s2n_set *ticket_keys;
struct s2n_set *ticket_key_hashes;
uint64_t encrypt_decrypt_key_lifetime_in_nanos;
uint64_t decrypt_key_lifetime_in_nanos;
/* If session cache is being used, these must all be set */
s2n_cache_store_callback cache_store;
void *cache_store_data;
s2n_cache_retrieve_callback cache_retrieve;
void *cache_retrieve_data;
s2n_cache_delete_callback cache_delete;
void *cache_delete_data;
s2n_ct_support_level ct_type;
s2n_cert_auth_type client_cert_auth_type;
s2n_alert_behavior alert_behavior;
/* Return TRUE if the host should be trusted, If FALSE this will likely be called again for every host/alternative name
* in the certificate. If any respond TRUE. If none return TRUE, the cert will be considered untrusted. */
uint8_t (*verify_host)(const char *host_name, size_t host_name_len, void *data);
void *data_for_verify_host;
s2n_crl_lookup_callback crl_lookup_cb;
void *crl_lookup_ctx;
/* Application supplied callback to resolve domain name conflicts when loading certs. */
s2n_cert_tiebreak_callback cert_tiebreak_cb;
uint8_t mfl_code;
uint8_t initial_tickets_to_send;
struct s2n_x509_trust_store trust_store;
uint16_t max_verify_cert_chain_depth;
s2n_async_pkey_fn async_pkey_cb;
s2n_psk_selection_callback psk_selection_cb;
void *psk_selection_ctx;
s2n_key_log_fn key_log_cb;
void *key_log_ctx;
s2n_session_ticket_fn session_ticket_cb;
void *session_ticket_ctx;
s2n_early_data_cb early_data_cb;
uint32_t server_max_early_data_size;
s2n_psk_mode psk_mode;
s2n_async_pkey_validation_mode async_pkey_validation_mode;
/* The user defined context associated with config */
void *context;
s2n_cert_ownership cert_ownership;
/* Used to override the stuffer size for a connection's `out` stuffer. */
uint32_t send_buffer_size_override;
void *renegotiate_request_ctx;
s2n_renegotiate_request_cb renegotiate_request_cb;
};
S2N_CLEANUP_RESULT s2n_config_ptr_free(struct s2n_config **config);
int s2n_config_defaults_init(void);
struct s2n_config *s2n_fetch_default_config(void);
int s2n_config_set_unsafe_for_testing(struct s2n_config *config);
int s2n_config_init_session_ticket_keys(struct s2n_config *config);
int s2n_config_free_session_ticket_keys(struct s2n_config *config);
void s2n_wipe_static_configs(void);
struct s2n_cert_chain_and_key *s2n_config_get_single_default_cert(struct s2n_config *config);
int s2n_config_get_num_default_certs(struct s2n_config *config);
S2N_RESULT s2n_config_wall_clock(struct s2n_config *config, uint64_t *output);
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