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pki.h
/*
* This file is part of the SSH Library
*
* Copyright (c) 2010 by Aris Adamantiadis
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef PKI_H_
#define PKI_H_
#include <stdint.h>
#include "libssh/priv.h"
#ifdef HAVE_OPENSSL_EC_H
#include <openssl/ec.h>
#endif
#ifdef HAVE_OPENSSL_ECDSA_H
#include <openssl/ecdsa.h>
#endif
#ifdef HAVE_LIBCRYPTO
#include <openssl/evp.h>
#endif
#include "libssh/crypto.h"
#ifdef HAVE_LIBCRYPTO
/* If using OpenSSL implementation, define the signature length which would be
* defined in libssh/ed25519.h otherwise */
#define ED25519_SIG_LEN 64
#else
#include "libssh/ed25519.h"
#endif
/* This definition is used for both OpenSSL and internal implementations */
#define ED25519_KEY_LEN 32
#define MAX_PUBKEY_SIZE 0x100000 /* 1M */
#define MAX_PRIVKEY_SIZE 0x400000 /* 4M */
#define RSA_MIN_KEY_SIZE 1024
#define RSA_MIN_FIPS_KEY_SIZE 2048
#define RSA_DEFAULT_KEY_SIZE 3072
#define SSH_KEY_FLAG_EMPTY 0x0
#define SSH_KEY_FLAG_PUBLIC 0x0001
#define SSH_KEY_FLAG_PRIVATE 0x0002
#define SSH_KEY_FLAG_PKCS11_URI 0x0004
/* Constants matching the Lightweight Secure Shell Signature Format */
/* https://datatracker.ietf.org/doc/draft-josefsson-sshsig-format */
#define SSHSIG_VERSION 0x01
#define SSHSIG_MAGIC_PREAMBLE "SSHSIG"
#define SSHSIG_MAGIC_PREAMBLE_LEN (sizeof(SSHSIG_MAGIC_PREAMBLE) - 1)
#define SSHSIG_BEGIN_SIGNATURE "-----BEGIN SSH SIGNATURE-----"
#define SSHSIG_END_SIGNATURE "-----END SSH SIGNATURE-----"
#define SSHSIG_LINE_LENGTH 76
struct ssh_key_struct {
enum ssh_keytypes_e type;
int flags;
const char *type_c; /* Don't free it ! it is static */
int ecdsa_nid;
#if defined(HAVE_LIBGCRYPT)
gcry_sexp_t rsa;
gcry_sexp_t ecdsa;
#elif defined(HAVE_LIBMBEDCRYPTO)
mbedtls_pk_context *pk;
mbedtls_ecdsa_context *ecdsa;
#elif defined(HAVE_LIBCRYPTO)
/* This holds either ENGINE/PROVIDER key for PKCS#11 support
* or just key in high-level format */
EVP_PKEY *key;
/* keep this around for FIPS mode so we can parse the public keys. We won't
* be able to use them nor use the private keys though */
uint8_t *ed25519_pubkey;
#endif /* HAVE_LIBGCRYPT */
#ifndef HAVE_LIBCRYPTO
ed25519_pubkey *ed25519_pubkey;
ed25519_privkey *ed25519_privkey;
#endif /* HAVE_LIBCRYPTO */
ssh_string sk_application;
ssh_buffer cert;
enum ssh_keytypes_e cert_type;
/* Security Key specific private data */
uint8_t sk_flags;
ssh_string sk_key_handle;
ssh_string sk_reserved;
/* Resident key specific metadata */
ssh_string sk_user_id;
};
struct ssh_signature_struct {
enum ssh_keytypes_e type;
enum ssh_digest_e hash_type;
const char *type_c;
#if defined(HAVE_LIBGCRYPT)
gcry_sexp_t rsa_sig;
gcry_sexp_t ecdsa_sig;
#elif defined(HAVE_LIBMBEDCRYPTO)
ssh_string rsa_sig;
struct mbedtls_ecdsa_sig ecdsa_sig;
#endif /* HAVE_LIBGCRYPT */
#ifndef HAVE_LIBCRYPTO
ed25519_signature *ed25519_sig;
#endif /* HAVE_LIBGCRYPT */
ssh_string raw_sig;
/* Security Key specific additions */
uint8_t sk_flags;
uint32_t sk_counter;
};
typedef struct ssh_signature_struct *ssh_signature;
#ifdef __cplusplus
extern "C" {
#endif
/* SSH Key Functions */
void ssh_key_clean (ssh_key key);
const char *
ssh_key_get_signature_algorithm(ssh_session session,
enum ssh_keytypes_e type);
enum ssh_keytypes_e ssh_key_type_from_signature_name(const char *name);
enum ssh_keytypes_e ssh_key_type_plain(enum ssh_keytypes_e type);
enum ssh_digest_e ssh_key_type_to_hash(ssh_session session,
enum ssh_keytypes_e type);
enum ssh_digest_e ssh_key_hash_from_name(const char *name);
#define is_ecdsa_key_type(t) \
((t) >= SSH_KEYTYPE_ECDSA_P256 && (t) <= SSH_KEYTYPE_ECDSA_P521)
#define is_cert_type(kt)\
((kt) == SSH_KEYTYPE_RSA_CERT01 ||\
(kt) == SSH_KEYTYPE_SK_ECDSA_CERT01 ||\
(kt) == SSH_KEYTYPE_SK_ED25519_CERT01 ||\
((kt) >= SSH_KEYTYPE_ECDSA_P256_CERT01 &&\
(kt) <= SSH_KEYTYPE_ED25519_CERT01))
#define is_sk_key_type(kt) \
((kt) == SSH_KEYTYPE_SK_ECDSA || (kt) == SSH_KEYTYPE_SK_ED25519 || \
(kt) == SSH_KEYTYPE_SK_ECDSA_CERT01 || \
(kt) == SSH_KEYTYPE_SK_ED25519_CERT01)
/* SSH Signature Functions */
ssh_signature ssh_signature_new(void);
void ssh_signature_free(ssh_signature sign);
#define SSH_SIGNATURE_FREE(x) \
do { ssh_signature_free(x); x = NULL; } while(0)
int ssh_pki_export_signature_blob(const ssh_signature sign,
ssh_string *sign_blob);
int ssh_pki_import_signature_blob(const ssh_string sig_blob,
const ssh_key pubkey,
ssh_signature *psig);
int ssh_pki_signature_verify(ssh_session session,
ssh_signature sig,
const ssh_key key,
const unsigned char *digest,
size_t dlen);
/* SSH Public Key Functions */
int ssh_pki_export_pubkey_blob(const ssh_key key,
ssh_string *pblob);
int ssh_pki_import_pubkey_blob(const ssh_string key_blob,
ssh_key *pkey);
int ssh_pki_import_cert_blob(const ssh_string cert_blob,
ssh_key *pkey);
/* SSH Private Key Functions */
int ssh_pki_export_privkey_blob(const ssh_key key,
ssh_string *pblob);
/* SSH Signing Functions */
ssh_string ssh_pki_do_sign(ssh_session session, ssh_buffer sigbuf,
const ssh_key privatekey, enum ssh_digest_e hash_type);
ssh_string ssh_pki_do_sign_agent(ssh_session session,
struct ssh_buffer_struct *buf,
const ssh_key pubkey);
ssh_string ssh_srv_pki_do_sign_sessionid(ssh_session session,
const ssh_key privkey,
const enum ssh_digest_e digest);
/* Temporary functions, to be removed after migration to ssh_key */
ssh_public_key ssh_pki_convert_key_to_publickey(const ssh_key key);
ssh_private_key ssh_pki_convert_key_to_privatekey(const ssh_key key);
int ssh_key_algorithm_allowed(ssh_session session, const char *type);
bool ssh_key_size_allowed(ssh_session session, ssh_key key);
/* Return the key size in bits */
int ssh_key_size(ssh_key key);
/* PKCS11 URI function to check if filename is a path or a PKCS11 URI */
#ifdef WITH_PKCS11_URI
bool ssh_pki_is_uri(const char *filename);
char *ssh_pki_export_pub_uri_from_priv_uri(const char *priv_uri);
#endif /* WITH_PKCS11_URI */
#ifdef __cplusplus
}
#endif
#endif /* PKI_H_ */
ssh_key_type_to_hash
enum ssh_digest_e ssh_key_type_to_hash(ssh_session session, enum ssh_keytypes_e type)
Convert a key type to a hash type. This is usually unambiguous for all the key types,...
Definition pki.c:628
ssh_key_type_plain
enum ssh_keytypes_e ssh_key_type_plain(enum ssh_keytypes_e type)
Get the public key type corresponding to a certificate type.
Definition pki.c:781
ssh_key_type_from_signature_name
enum ssh_keytypes_e ssh_key_type_from_signature_name(const char *name)
Convert a ssh key algorithm name to a ssh key algorithm type.
Definition pki.c:710
ssh_key_algorithm_allowed
int ssh_key_algorithm_allowed(ssh_session session, const char *type)
Checks the given key against the configured allowed public key algorithm types.
Definition pki.c:494
ssh_key_clean
void ssh_key_clean(ssh_key key)
clean up the key and deallocate all existing keys
Definition pki.c:221
ssh_key_get_signature_algorithm
const char * ssh_key_get_signature_algorithm(ssh_session session, enum ssh_keytypes_e type)
Gets signature algorithm name to be used with the given key type.
Definition pki.c:678
ssh_key_size_allowed
bool ssh_key_size_allowed(ssh_session session, ssh_key key)
Check the given key is acceptable in regards to the key size policy specified by the configuration.
Definition pki.c:548