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- djm@cvs.openbsd.org 2010/02/26 20:29:54 [PROTOCOL PROTOCOL.agent PROTOCOL.certkeys addrmatch.c auth-options.c] [auth-options.h auth.h auth2-pubkey.c authfd.c dns.c dns.h hostfile.c] [hostfile.h kex.h kexdhs.c kexgexs.c key.c key.h match.h monitor.c] [myproposal.h servconf.c servconf.h ssh-add.c ssh-agent.c ssh-dss.c] [ssh-keygen.1 ssh-keygen.c ssh-rsa.c ssh.1 ssh.c ssh2.h sshconnect.c] [sshconnect2.c sshd.8 sshd.c sshd_config.5] Add support for certificate key types for users and hosts. OpenSSH certificate key types are not X.509 certificates, but a much simpler format that encodes a public key, identity information and some validity constraints and signs it with a CA key. CA keys are regular SSH keys. This certificate style avoids the attack surface of X.509 certificates and is very easy to deploy. Certified host keys allow automatic acceptance of new host keys when a CA certificate is marked as sh/known_hosts. see VERIFYING HOST KEYS in ssh(1) for details. Certified user keys allow authentication of users when the signing CA key is marked as trusted in authorized_keys. See "AUTHORIZED_KEYS FILE FORMAT" in sshd(8) for details. Certificates are minted using ssh-keygen(1), documentation is in the "CERTIFICATES" section of that manpage. Documentation on the format of certificates is in the file PROTOCOL.certkeys feedback and ok markus@
115 lines
3.6 KiB
C
115 lines
3.6 KiB
C
/* $OpenBSD: key.h,v 1.28 2010/02/26 20:29:54 djm Exp $ */
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/*
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* Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef KEY_H
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#define KEY_H
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#include "buffer.h"
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#include <openssl/rsa.h>
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#include <openssl/dsa.h>
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typedef struct Key Key;
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enum types {
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KEY_RSA1,
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KEY_RSA,
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KEY_DSA,
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KEY_RSA_CERT,
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KEY_DSA_CERT,
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KEY_UNSPEC
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};
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enum fp_type {
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SSH_FP_SHA1,
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SSH_FP_MD5
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};
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enum fp_rep {
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SSH_FP_HEX,
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SSH_FP_BUBBLEBABBLE,
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SSH_FP_RANDOMART
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};
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/* key is stored in external hardware */
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#define KEY_FLAG_EXT 0x0001
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#define CERT_MAX_PRINCIPALS 256
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struct KeyCert {
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Buffer certblob; /* Kept around for use on wire */
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u_int type; /* SSH2_CERT_TYPE_USER or SSH2_CERT_TYPE_HOST */
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char *key_id;
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u_int nprincipals;
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char **principals;
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u_int64_t valid_after, valid_before;
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Buffer constraints;
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Key *signature_key;
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};
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struct Key {
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int type;
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int flags;
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RSA *rsa;
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DSA *dsa;
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struct KeyCert *cert;
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};
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Key *key_new(int);
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void key_add_private(Key *);
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Key *key_new_private(int);
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void key_free(Key *);
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Key *key_demote(const Key *);
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int key_equal_public(const Key *, const Key *);
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int key_equal(const Key *, const Key *);
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char *key_fingerprint(Key *, enum fp_type, enum fp_rep);
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u_char *key_fingerprint_raw(Key *, enum fp_type, u_int *);
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const char *key_type(const Key *);
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int key_write(const Key *, FILE *);
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int key_read(Key *, char **);
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u_int key_size(const Key *);
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Key *key_generate(int, u_int);
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Key *key_from_private(const Key *);
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int key_type_from_name(char *);
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int key_is_cert(const Key *);
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int key_type_plain(int);
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int key_to_certified(Key *);
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int key_drop_cert(Key *);
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int key_certify(Key *, Key *);
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void key_cert_copy(const Key *, struct Key *);
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int key_cert_check_authority(const Key *, int, int, const char *,
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const char **);
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Key *key_from_blob(const u_char *, u_int);
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int key_to_blob(const Key *, u_char **, u_int *);
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const char *key_ssh_name(const Key *);
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int key_names_valid2(const char *);
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int key_sign(const Key *, u_char **, u_int *, const u_char *, u_int);
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int key_verify(const Key *, const u_char *, u_int, const u_char *, u_int);
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int ssh_dss_sign(const Key *, u_char **, u_int *, const u_char *, u_int);
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int ssh_dss_verify(const Key *, const u_char *, u_int, const u_char *, u_int);
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int ssh_rsa_sign(const Key *, u_char **, u_int *, const u_char *, u_int);
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int ssh_rsa_verify(const Key *, const u_char *, u_int, const u_char *, u_int);
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#endif
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