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/*
* ProFTPD - mod_proxy SSH keys API
* Copyright (c) 2021-2022 TJ Saunders
*
* 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 2 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA.
*
* As a special exemption, TJ Saunders and other respective copyright holders
* give permission to link this program with OpenSSL, and distribute the
* resulting executable, without including the source code for OpenSSL in the
* source distribution.
*/
#ifndef MOD_PROXY_SSH_KEYS_H
#define MOD_PROXY_SSH_KEYS_H
#include "mod_proxy.h"
#if defined(PR_USE_OPENSSL)
#include <openssl/ec.h>
enum proxy_ssh_key_type_e {
PROXY_SSH_KEY_UNKNOWN = 0,
PROXY_SSH_KEY_DSA,
PROXY_SSH_KEY_RSA,
PROXY_SSH_KEY_RSA_SHA256,
PROXY_SSH_KEY_RSA_SHA512,
PROXY_SSH_KEY_ECDSA_256,
PROXY_SSH_KEY_ECDSA_384,
PROXY_SSH_KEY_ECDSA_521,
PROXY_SSH_KEY_ED25519,
PROXY_SSH_KEY_ED448
};
/* Returns a string of colon-separated lowercase hex characters, representing
* the key "fingerprint" which has been run through the specified digest
* algorithm.
*
* As per draft-ietf-secsh-fingerprint-00, only MD5 fingerprints are currently
* supported.
*/
const char *proxy_ssh_keys_get_fingerprint(pool *, unsigned char *, uint32_t,
int);
#define PROXY_SSH_KEYS_FP_DIGEST_MD5 1
#define PROXY_SSH_KEYS_FP_DIGEST_SHA1 2
#define PROXY_SSH_KEYS_FP_DIGEST_SHA256 3
enum proxy_ssh_key_type_e proxy_ssh_keys_get_key_type(const char *algo);
const char *proxy_ssh_keys_get_key_type_desc(enum proxy_ssh_key_type_e);
void proxy_ssh_keys_free(void);
int proxy_ssh_keys_have_hostkey(enum proxy_ssh_key_type_e);
int proxy_ssh_keys_get_hostkey(pool *p, const char *);
const unsigned char *proxy_ssh_keys_get_hostkey_data(pool *,
enum proxy_ssh_key_type_e, uint32_t *);
void proxy_ssh_keys_get_passphrases(void);
int proxy_ssh_keys_set_passphrase_provider(const char *);
const unsigned char *proxy_ssh_keys_sign_data(pool *, enum proxy_ssh_key_type_e,
const unsigned char *, size_t, size_t *);
#if defined(PR_USE_OPENSSL_ECC)
int proxy_ssh_keys_validate_ecdsa_params(const EC_GROUP *, const EC_POINT *);
#endif /* PR_USE_OPENSSL_ECC */
int proxy_ssh_keys_verify_pubkey_type(pool *, unsigned char *, uint32_t,
enum proxy_ssh_key_type_e);
int proxy_ssh_keys_verify_signed_data(pool *p, const char *pubkey_algo,
unsigned char *pubkey_data, uint32_t pubkey_datalen,
unsigned char *signature, uint32_t signaturelen,
unsigned char *sig_data, size_t sig_datalen);
#endif /* PR_USE_OPENSSL */
#endif /* MOD_PROXY_SSH_KEYS_H */
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