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/*
* Copyright (c) 2019, Redict Labs
*
* SPDX-FileCopyrightText: 2024 Hiredict Contributors
* SPDX-FileCopyrightText: 2024 Redict Labs
*
* SPDX-License-Identifier: BSD-3-Clause
* SPDX-License-Identifier: LGPL-3.0-or-later
*
*/
#ifndef __HIREDICT_SSL_H
#define __HIREDICT_SSL_H
#ifdef __cplusplus
extern "C" {
#endif
/* This is the underlying struct for SSL in ssl.h, which is not included to
* keep build dependencies short here.
*/
struct ssl_st;
/* A wrapper around OpenSSL SSL_CTX to allow easy SSL use without directly
* calling OpenSSL.
*/
typedef struct redictSSLContext redictSSLContext;
/**
* Initialization errors that redictCreateSSLContext() may return.
*/
typedef enum {
REDICT_SSL_CTX_NONE = 0, /* No Error */
REDICT_SSL_CTX_CREATE_FAILED, /* Failed to create OpenSSL SSL_CTX */
REDICT_SSL_CTX_CERT_KEY_REQUIRED, /* Client cert and key must both be specified or skipped */
REDICT_SSL_CTX_CA_CERT_LOAD_FAILED, /* Failed to load CA Certificate or CA Path */
REDICT_SSL_CTX_CLIENT_CERT_LOAD_FAILED, /* Failed to load client certificate */
REDICT_SSL_CTX_CLIENT_DEFAULT_CERT_FAILED, /* Failed to set client default certificate directory */
REDICT_SSL_CTX_PRIVATE_KEY_LOAD_FAILED, /* Failed to load private key */
REDICT_SSL_CTX_OS_CERTSTORE_OPEN_FAILED, /* Failed to open system certificate store */
REDICT_SSL_CTX_OS_CERT_ADD_FAILED /* Failed to add CA certificates obtained from system to the SSL context */
} redictSSLContextError;
/* Constants that mirror OpenSSL's verify modes. By default,
* REDICT_SSL_VERIFY_PEER is used with redictCreateSSLContext().
* Some Redict clients disable peer verification if there are no
* certificates specified.
*/
#define REDICT_SSL_VERIFY_NONE 0x00
#define REDICT_SSL_VERIFY_PEER 0x01
#define REDICT_SSL_VERIFY_FAIL_IF_NO_PEER_CERT 0x02
#define REDICT_SSL_VERIFY_CLIENT_ONCE 0x04
#define REDICT_SSL_VERIFY_POST_HANDSHAKE 0x08
/* Options to create an OpenSSL context. */
typedef struct {
const char *cacert_filename;
const char *capath;
const char *cert_filename;
const char *private_key_filename;
const char *server_name;
int verify_mode;
} redictSSLOptions;
/**
* Return the error message corresponding with the specified error code.
*/
const char *redictSSLContextGetError(redictSSLContextError error);
/**
* Helper function to initialize the OpenSSL library.
*
* OpenSSL requires one-time initialization before it can be used. Callers should
* call this function only once, and only if OpenSSL is not directly initialized
* elsewhere.
*/
int redictInitOpenSSL(void);
/**
* Helper function to initialize an OpenSSL context that can be used
* to initiate SSL connections.
*
* cacert_filename is an optional name of a CA certificate/bundle file to load
* and use for validation.
*
* capath is an optional directory path where trusted CA certificate files are
* stored in an OpenSSL-compatible structure.
*
* cert_filename and private_key_filename are optional names of a client side
* certificate and private key files to use for authentication. They need to
* be both specified or omitted.
*
* server_name is an optional and will be used as a server name indication
* (SNI) TLS extension.
*
* If error is non-null, it will be populated in case the context creation fails
* (returning a NULL).
*/
redictSSLContext *redictCreateSSLContext(const char *cacert_filename, const char *capath,
const char *cert_filename, const char *private_key_filename,
const char *server_name, redictSSLContextError *error);
/**
* Helper function to initialize an OpenSSL context that can be used
* to initiate SSL connections. This is a more extensible version of redictCreateSSLContext().
*
* options contains a structure of SSL options to use.
*
* If error is non-null, it will be populated in case the context creation fails
* (returning a NULL).
*/
redictSSLContext *redictCreateSSLContextWithOptions(redictSSLOptions *options,
redictSSLContextError *error);
/**
* Free a previously created OpenSSL context.
*/
void redictFreeSSLContext(redictSSLContext *redict_ssl_ctx);
/**
* Initiate SSL on an existing redictContext.
*
* This is similar to redictInitiateSSL() but does not require the caller
* to directly interact with OpenSSL, and instead uses a redictSSLContext
* previously created using redictCreateSSLContext().
*/
int redictInitiateSSLWithContext(redictContext *c, redictSSLContext *redict_ssl_ctx);
/**
* Initiate SSL/TLS negotiation on a provided OpenSSL SSL object.
*/
int redictInitiateSSL(redictContext *c, struct ssl_st *ssl);
#ifdef __cplusplus
}
#endif
#endif /* __HIREDICT_SSL_H */
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