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/*
* Copyright (c) 2001-2003 Simon Wilkinson. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR `AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Copyright 2008 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#ifndef _SSH_GSS_H
#define _SSH_GSS_H
#pragma ident "%Z%%M% %I% %E% SMI"
#ifdef GSSAPI
#include "kex.h"
#include "buffer.h"
#ifdef SUNW_GSSAPI
#include <gssapi/gssapi.h>
#include <gssapi/gssapi_ext.h>
#else
#ifdef GSS_KRB5
#ifndef HEIMDAL
#include <gssapi_generic.h>
/* MIT Kerberos doesn't seem to define GSS_NT_HOSTBASED_SERVICE */
#ifndef GSS_C_NT_HOSTBASED_SERVICE
#define GSS_C_NT_HOSTBASED_SERVICE gss_nt_service_name
#endif /* GSS_C_NT_... */
#endif /* !HEIMDAL */
#endif /* GSS_KRB5 */
#endif /* SUNW_GSSAPI */
/* draft-ietf-secsh-gsskeyex-03 */
#define SSH2_MSG_KEXGSS_INIT 30
#define SSH2_MSG_KEXGSS_CONTINUE 31
#define SSH2_MSG_KEXGSS_COMPLETE 32
#define SSH2_MSG_KEXGSS_HOSTKEY 33
#define SSH2_MSG_KEXGSS_ERROR 34
#define SSH2_MSG_USERAUTH_GSSAPI_RESPONSE 60
#define SSH2_MSG_USERAUTH_GSSAPI_TOKEN 61
#define SSH2_MSG_USERAUTH_GSSAPI_EXCHANGE_COMPLETE 63
#define SSH2_MSG_USERAUTH_GSSAPI_ERROR 64
#define SSH2_MSG_USERAUTH_GSSAPI_ERRTOK 65
#define SSH2_MSG_USERAUTH_GSSAPI_MIC 66
#define KEX_GSS_SHA1 "gss-group1-sha1-"
#define SSH_GSS_HOSTBASED_SERVICE "host"
#ifndef HAVE_GSS_STORE_CRED
typedef struct ssh_gssapi_cred_store ssh_gssapi_cred_store; /* server-only */
#endif /* !HAVE_GSS_STORE_CRED */
typedef struct {
OM_uint32 major;
OM_uint32 minor;
int local; /* true on client, false on server */
int established;
OM_uint32 flags;
gss_ctx_id_t context;
gss_OID desired_mech; /* client-side only */
gss_OID actual_mech;
gss_name_t desired_name; /* targ on both */
gss_name_t src_name;
gss_name_t dst_name;
gss_cred_id_t creds; /* server-side only */
gss_cred_id_t deleg_creds; /* server-side only */
int default_creds; /* server-side only */
#ifndef HAVE_GSS_STORE_CRED
ssh_gssapi_cred_store *cred_store; /* server-side only */
#endif /* !HAVE_GSS_STORE_CRED */
} Gssctxt;
/* Functions to get supported mech lists */
void ssh_gssapi_server_mechs(gss_OID_set *mechs);
void ssh_gssapi_client_mechs(const char *server_host, gss_OID_set *mechs);
/* Functions to get fix KEX proposals (needed for rekey cases) */
void ssh_gssapi_modify_kex(Kex *kex, gss_OID_set mechs, char **proposal);
void ssh_gssapi_server_kex_hook(Kex *kex, char **proposal);
void ssh_gssapi_client_kex_hook(Kex *kex, char **proposal);
/* Map an encoded mechanism keyex name to a mechanism OID */
void ssh_gssapi_mech_oid_to_kexname(const gss_OID mech, char **kexname);
void ssh_gssapi_mech_oids_to_kexnames(const gss_OID_set mechs,
char **kexname_list);
/* dup oid? */
void ssh_gssapi_oid_of_kexname(const char *kexname, gss_OID *mech);
/*
* Unfortunately, the GSS-API is not generic enough for some things --
* see gss-serv.c and ssh-gss.c
*/
int ssh_gssapi_is_spnego(gss_OID oid);
int ssh_gssapi_is_krb5(gss_OID oid);
int ssh_gssapi_is_gsi(gss_OID oid);
int ssh_gssapi_is_dh(gss_OID oid);
/* GSS_Init/Accept_sec_context() and GSS_Acquire_cred() wrappers */
/* client-only */
OM_uint32 ssh_gssapi_init_ctx(Gssctxt *ctx, const char *server_host,
int deleg_creds, gss_buffer_t recv_tok, gss_buffer_t send_tok);
/* server-only */
OM_uint32 ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_t recv_tok,
gss_buffer_t send_tok);
/* server-only */
OM_uint32 ssh_gssapi_acquire_cred(Gssctxt *ctx);
/* MIC wrappers */
OM_uint32 ssh_gssapi_get_mic(Gssctxt *ctx, gss_buffer_t buffer,
gss_buffer_t hash);
OM_uint32 ssh_gssapi_verify_mic(Gssctxt *ctx, gss_buffer_t buffer,
gss_buffer_t hash);
/* Gssctxt functions */
void ssh_gssapi_build_ctx(Gssctxt **ctx, int client, gss_OID mech);
void ssh_gssapi_delete_ctx(Gssctxt **ctx);
int ssh_gssapi_check_mech_oid(Gssctxt *ctx, void *data, size_t len);
void ssh_gssapi_error(Gssctxt *ctx, const char *where);
char *ssh_gssapi_last_error(Gssctxt *ctxt, OM_uint32 *maj, OM_uint32 *min);
/* Server-side */
int ssh_gssapi_userok(Gssctxt *ctx, char *name);
char *ssh_gssapi_localname(Gssctxt *ctx);
/* Server-side, if PAM and gss_store_cred() are available, ... */
struct Authctxt; /* needed to avoid conflicts between auth.h, sshconnect2.c */
void ssh_gssapi_storecreds(Gssctxt *ctx, struct Authctxt *authctxt);
/* ... else, if other interfaces are available for GSS-API cred storing */
void ssh_gssapi_do_child(Gssctxt *ctx, char ***envp, uint_t *envsizep);
void ssh_gssapi_cleanup_creds(Gssctxt *ctx);
/* Misc */
int ssh_gssapi_import_name(Gssctxt *ctx, const char *server_host);
const char *ssh_gssapi_oid_to_name(gss_OID oid);
char *ssh_gssapi_oid_to_str(gss_OID oid);
gss_OID ssh_gssapi_dup_oid(gss_OID oid);
gss_OID ssh_gssapi_make_oid(size_t length, void *elements);
gss_OID ssh_gssapi_make_oid_ext(size_t length, void *elements,
int der_wrapped);
void *ssh_gssapi_der_wrap(size_t, size_t *length);
size_t ssh_gssapi_der_wrap_size(size_t, size_t *length);
void ssh_gssapi_release_oid(gss_OID *oid);
#endif /* GSSAPI */
#endif /* _SSH_GSS_H */
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