/*
 * Copyright 2003 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#ifndef	_GSSAPIP_SPNEGO_H_
#define	_GSSAPIP_SPNEGO_H_

/* #pragma ident	"@(#)gssapiP_spnego.h	1.3	03/09/18 SMI" */

#ifdef	__cplusplus
extern "C" {
#endif

typedef struct spnego_ctx_st *spnego_gss_ctx_id_t;

#include <gssapi/gssapi.h>
#include <gssapi/gssapi_ext.h>
#include <k5-queue.h>
#include "gssapiP_negoex.h"

#define	SEC_CONTEXT_TOKEN 1
#define	SPNEGO_SIZE_OF_INT 4

#define	ACCEPT_COMPLETE 0
#define	ACCEPT_INCOMPLETE 1
#define	REJECT 2
#define REQUEST_MIC 3
#define	UNSPECIFIED 0xffffffffUL

/*
 * constants for der encoding/decoding routines.
 */

#define	MECH_OID		0x06
#define	OCTET_STRING		0x04
#define	CONTEXT			0xa0
#define	SEQUENCE		0x30
#define	SEQUENCE_OF		0x30
#define	BIT_STRING		0x03
#define	BIT_STRING_LENGTH	0x02
#define	BIT_STRING_PADDING	0x01
#define	ENUMERATED		0x0a
#define	ENUMERATION_LENGTH	1
#define	HEADER_ID		0x60
#define GENERAL_STRING		0x1b

/*
 * SPNEGO and NegoEx minor status codes
 */
#define ERR_SPNEGO_NO_MECHS_AVAILABLE			0x20000001
#define ERR_SPNEGO_NO_CREDS_ACQUIRED			0x20000002
#define ERR_SPNEGO_NO_MECH_FROM_ACCEPTOR		0x20000003
#define ERR_SPNEGO_NEGOTIATION_FAILED			0x20000004
#define ERR_SPNEGO_NO_TOKEN_FROM_ACCEPTOR		0x20000005
#define ERR_NEGOEX_INVALID_MESSAGE_SIGNATURE		0x20000006
#define ERR_NEGOEX_INVALID_MESSAGE_TYPE			0x20000007
#define ERR_NEGOEX_INVALID_MESSAGE_SIZE			0x20000008
#define ERR_NEGOEX_INVALID_CONVERSATION_ID		0x20000009
#define ERR_NEGOEX_AUTH_SCHEME_NOT_FOUND		0x20000010
#define ERR_NEGOEX_MISSING_NEGO_MESSAGE			0x20000011
#define ERR_NEGOEX_MISSING_AP_REQUEST_MESSAGE		0x20000012
#define ERR_NEGOEX_NO_AVAILABLE_MECHS			0x20000013
#define ERR_NEGOEX_NO_VERIFY_KEY			0x20000014
#define ERR_NEGOEX_UNKNOWN_CHECKSUM_SCHEME		0x20000015
#define ERR_NEGOEX_INVALID_CHECKSUM			0x20000016
#define ERR_NEGOEX_UNSUPPORTED_CRITICAL_EXTENSION	0x20000017
#define ERR_NEGOEX_UNSUPPORTED_VERSION			0x20000018
#define ERR_NEGOEX_MESSAGE_OUT_OF_SEQUENCE		0x20000019

/*
 * send_token_flag is used to indicate in later steps what type
 * of token, if any should be sent or processed.
 * NO_TOKEN_SEND = no token should be sent
 * INIT_TOKEN_SEND = initial token will be sent
 * CONT_TOKEN_SEND = continuing tokens to be sent
 * CHECK_MIC = no token to be sent, but have a MIC to check.
 * ERROR_TOKEN_SEND = error token from peer needs to be sent.
 */

typedef	enum {NO_TOKEN_SEND, INIT_TOKEN_SEND, CONT_TOKEN_SEND,
		CHECK_MIC, ERROR_TOKEN_SEND} send_token_flag;

/*
 * The Mech OID:
 * { iso(1) org(3) dod(6) internet(1) security(5)
 *  mechanism(5) spnego(2) }
 */

#define	SPNEGO_OID_LENGTH 6
#define	SPNEGO_OID "\053\006\001\005\005\002"

typedef void *spnego_token_t;

/* spnego name structure for internal representation. */
typedef struct {
	gss_OID type;
	gss_buffer_t buffer;
	gss_OID	mech_type;
	gss_name_t	mech_name;
} spnego_name_desc, *spnego_name_t;

/* Structure for credential */
typedef struct {
	gss_cred_id_t mcred;	/* mechglue union of obtainable creds */
	gss_OID_set neg_mechs;	/* app-specified list of allowable mechs */
	int no_ask_integ;	/* do not request integ from mechs */
} spnego_gss_cred_id_rec, *spnego_gss_cred_id_t;

/* Structure for context handle */
struct spnego_ctx_st {
	OM_uint32	magic_num;
	gss_buffer_desc DER_mechTypes;
	gss_OID_set mech_set;
	gss_OID internal_mech;  /* alias into mech_set->elements */
	gss_ctx_id_t ctx_handle;
	int mic_reqd;
	int mic_sent;
	int mic_rcvd;
	int firstpass;
	int mech_complete;
	int nego_done;
	int initiate;
	int opened;
	OM_uint32 ctx_flags;
	gss_name_t internal_name;
	gss_OID actual_mech;
	gss_cred_id_t deleg_cred;
	int negoex_step;
	struct k5buf negoex_transcript;
	uint32_t negoex_seqnum;
	conversation_id negoex_conv_id;
	K5_TAILQ_HEAD(negoex_mech_list, negoex_auth_mech) negoex_mechs;
	krb5_context kctx;
};

/*
 * The magic number must be less than a standard pagesize
 * to avoid a possible collision with a real address.
 */
#define	SPNEGO_MAGIC_ID  0x00000fed

/* SPNEGO oid declarations */
extern const gss_OID_desc * const gss_mech_spnego;
extern const gss_OID_set_desc * const gss_mech_set_spnego;

#if defined(DEBUG) && defined(HAVE_SYSLOG_H)
#include <syslog.h>
#define	dsyslog(a) syslog(LOG_DEBUG, a)
#else
#define	dsyslog(a)
#define	SPNEGO_STATIC
#endif	/* DEBUG */

/*
 * declarations of internal name mechanism functions
 */

OM_uint32 KRB5_CALLCONV spnego_gss_acquire_cred
(
	OM_uint32 *,		/* minor_status */
	gss_name_t,		/* desired_name */
	OM_uint32,		/* time_req */
	gss_OID_set,		/* desired_mechs */
	gss_cred_usage_t,	/* cred_usage */
	gss_cred_id_t *,	/* output_cred_handle */
	gss_OID_set *,		/* actual_mechs */
	OM_uint32 *		/* time_rec */
);

OM_uint32 KRB5_CALLCONV spnego_gss_release_cred
(
	OM_uint32 *,		/* minor_status */
	/* CSTYLED */
	gss_cred_id_t	*	/* cred_handle */
);

OM_uint32 KRB5_CALLCONV spnego_gss_init_sec_context
(
	OM_uint32 *,		/* minor_status */
	gss_cred_id_t,		/* claimant_cred_handle */
	gss_ctx_id_t *,		/* context_handle */
	gss_name_t,		/* target_name */
	gss_OID,		/* mech_type */
	OM_uint32,		/* req_flags */
	OM_uint32,		/* time_req */
	gss_channel_bindings_t, /* input_chan_bindings */
	gss_buffer_t,		/* input_token */
	gss_OID *,		/* actual_mech_type */
	gss_buffer_t,		/* output_token */
	OM_uint32 *,		/* ret_flags */
	OM_uint32 *		/* time_rec */
);

#ifndef LEAN_CLIENT
OM_uint32 KRB5_CALLCONV spnego_gss_accept_sec_context
(
	OM_uint32 *,		/* minor_status */
	gss_ctx_id_t *,		/* context_handle */
	gss_cred_id_t,		/* verifier_cred_handle */
	gss_buffer_t,		/* input_token_buffer */
	gss_channel_bindings_t, /* input_chan_bindings */
	gss_name_t *,		/* src_name */
	gss_OID *,		/* mech_type */
	gss_buffer_t,		/* output_token */
	OM_uint32 *,		/* ret_flags */
	OM_uint32 *,		/* time_rec */
	/* CSTYLED */
	gss_cred_id_t *		/* delegated_cred_handle */
);
#endif /* LEAN_CLIENT */

OM_uint32 KRB5_CALLCONV spnego_gss_compare_name
(
	OM_uint32 *,		/* minor_status */
	const gss_name_t,	/* name1 */
	const gss_name_t,	/* name2 */
	int *			/* name_equal */
);

OM_uint32 KRB5_CALLCONV spnego_gss_display_name
(
	OM_uint32 *,		/* minor_status */
	gss_name_t,		/*  input_name */
	gss_buffer_t,		/*  output_name_buffer */
	gss_OID *		/* output_name_type */
);

OM_uint32 KRB5_CALLCONV spnego_gss_display_status
(
	OM_uint32 *,		/* minor_status */
	OM_uint32,		/* status_value */
	int,			/* status_type */
	gss_OID,		/* mech_type */
	OM_uint32 *,		/* message_context */
	gss_buffer_t		/* status_string */
);

OM_uint32 KRB5_CALLCONV spnego_gss_import_name
(
	OM_uint32 *,		/* minor_status */
	gss_buffer_t,		/* input_name_buffer */
	gss_OID,		/* input_name_type */
	/* CSTYLED */
	gss_name_t *		/* output_name */
);

OM_uint32 KRB5_CALLCONV spnego_gss_release_name
(
	OM_uint32 *,		/* minor_status */
	/* CSTYLED */
	gss_name_t *		/* input_name */
);

OM_uint32 KRB5_CALLCONV spnego_gss_duplicate_name
(
	OM_uint32 *,		/* minor_status */
	/* CSTYLED */
	const gss_name_t, 	/* input_name */
	gss_name_t *		/* output_name */
);

OM_uint32 KRB5_CALLCONV spnego_gss_inquire_cred
(
	OM_uint32 *,		/* minor_status */
	gss_cred_id_t,		/* cred_handle */
	gss_name_t *,		/* name */
	OM_uint32 *,		/* lifetime */
	int *,			/* cred_usage */
	gss_OID_set *		/* mechanisms */
);

OM_uint32 KRB5_CALLCONV spnego_gss_inquire_names_for_mech
(
	OM_uint32 *,		/* minor_status */
	gss_OID,		/* mechanism */
	gss_OID_set *		/* name_types */
);

OM_uint32 KRB5_CALLCONV spnego_gss_unwrap
(
	OM_uint32 *minor_status,
	gss_ctx_id_t context_handle,
	gss_buffer_t input_message_buffer,
	gss_buffer_t output_message_buffer,
	int *conf_state,
	gss_qop_t *qop_state
);

OM_uint32 KRB5_CALLCONV spnego_gss_wrap
(
	OM_uint32 *minor_status,
	gss_ctx_id_t context_handle,
	int conf_req_flag,
	gss_qop_t qop_req,
	gss_buffer_t input_message_buffer,
	int *conf_state,
	gss_buffer_t output_message_buffer
);

OM_uint32 KRB5_CALLCONV spnego_gss_process_context_token
(
	OM_uint32	*minor_status,
	const gss_ctx_id_t context_handle,
	const gss_buffer_t token_buffer
);

OM_uint32 KRB5_CALLCONV spnego_gss_delete_sec_context
(
	OM_uint32 *minor_status,
	gss_ctx_id_t *context_handle,
	gss_buffer_t output_token
);

OM_uint32 KRB5_CALLCONV spnego_gss_context_time
(
	OM_uint32	*minor_status,
	const gss_ctx_id_t context_handle,
	OM_uint32	*time_rec
);
#ifndef LEAN_CLIENT
OM_uint32 KRB5_CALLCONV spnego_gss_export_sec_context
(
	OM_uint32	*minor_status,
	gss_ctx_id_t	*context_handle,
	gss_buffer_t	interprocess_token
);

OM_uint32 KRB5_CALLCONV spnego_gss_import_sec_context
(
	OM_uint32		*minor_status,
	const gss_buffer_t	interprocess_token,
	gss_ctx_id_t		*context_handle
);
#endif /* LEAN_CLIENT */

OM_uint32 KRB5_CALLCONV spnego_gss_inquire_context
(
	OM_uint32	*minor_status,
	const gss_ctx_id_t context_handle,
	gss_name_t	*src_name,
	gss_name_t	*targ_name,
	OM_uint32	*lifetime_rec,
	gss_OID		*mech_type,
	OM_uint32	*ctx_flags,
	int		*locally_initiated,
	int		*opened
);

OM_uint32 KRB5_CALLCONV spnego_gss_wrap_size_limit
(
	OM_uint32	*minor_status,
	const gss_ctx_id_t context_handle,
	int		conf_req_flag,
	gss_qop_t	qop_req,
	OM_uint32	req_output_size,
	OM_uint32	*max_input_size
);

OM_uint32 KRB5_CALLCONV spnego_gss_localname
(
	OM_uint32 *minor_status,
	const gss_name_t pname,
	const gss_const_OID mech_type,
	gss_buffer_t localname
);

OM_uint32 KRB5_CALLCONV spnego_gss_get_mic
(
	OM_uint32 *minor_status,
	const gss_ctx_id_t context_handle,
	gss_qop_t qop_req,
	const gss_buffer_t message_buffer,
	gss_buffer_t message_token
);

OM_uint32 KRB5_CALLCONV spnego_gss_verify_mic
(
	OM_uint32 *minor_status,
	const gss_ctx_id_t context_handle,
	const gss_buffer_t msg_buffer,
	const gss_buffer_t token_buffer,
	gss_qop_t *qop_state
);

OM_uint32 KRB5_CALLCONV
spnego_gss_inquire_sec_context_by_oid
(
	OM_uint32 *minor_status,
	const gss_ctx_id_t context_handle,
	const gss_OID desired_object,
	gss_buffer_set_t *data_set
);

OM_uint32 KRB5_CALLCONV
spnego_gss_inquire_cred_by_oid
(
	OM_uint32 *minor_status,
	const gss_cred_id_t cred_handle,
	const gss_OID desired_object,
	gss_buffer_set_t *data_set
);

OM_uint32 KRB5_CALLCONV
spnego_gss_set_cred_option
(
	OM_uint32 *minor_status,
	gss_cred_id_t *cred_handle,
	const gss_OID desired_object,
	const gss_buffer_t value
);

OM_uint32 KRB5_CALLCONV
spnego_gss_set_sec_context_option
(
	OM_uint32 *minor_status,
	gss_ctx_id_t *context_handle,
	const gss_OID desired_object,
	const gss_buffer_t value
);

#ifdef _GSS_STATIC_LINK
int gss_spnegoint_lib_init(void);
void gss_spnegoint_lib_fini(void);
#else
gss_mechanism KRB5_CALLCONV gss_mech_initialize(void);
#endif /* _GSS_STATIC_LINK */

OM_uint32 KRB5_CALLCONV spnego_gss_wrap_aead
(
	OM_uint32 *minor_status,
	gss_ctx_id_t context_handle,
	int conf_req_flag,
	gss_qop_t qop_req,
	gss_buffer_t input_assoc_buffer,
	gss_buffer_t input_payload_buffer,
	int *conf_state,
	gss_buffer_t output_message_buffer
);

OM_uint32 KRB5_CALLCONV spnego_gss_unwrap_aead
(
	OM_uint32 *minor_status,
	gss_ctx_id_t context_handle,
	gss_buffer_t input_message_buffer,
	gss_buffer_t input_assoc_buffer,
	gss_buffer_t output_payload_buffer,
	int *conf_state,
	gss_qop_t *qop_state
);

OM_uint32 KRB5_CALLCONV spnego_gss_wrap_iov
(
	OM_uint32 *minor_status,
	gss_ctx_id_t context_handle,
	int conf_req_flag,
	gss_qop_t qop_req,
	int *conf_state,
	gss_iov_buffer_desc *iov,
	int iov_count
);

OM_uint32 KRB5_CALLCONV spnego_gss_unwrap_iov
(
	OM_uint32 *minor_status,
	gss_ctx_id_t context_handle,
	int *conf_state,
	gss_qop_t *qop_state,
	gss_iov_buffer_desc *iov,
	int iov_count
);

OM_uint32 KRB5_CALLCONV spnego_gss_wrap_iov_length
(
	OM_uint32 *minor_status,
	gss_ctx_id_t context_handle,
	int conf_req_flag,
	gss_qop_t qop_req,
	int *conf_state,
	gss_iov_buffer_desc *iov,
	int iov_count
);

OM_uint32 KRB5_CALLCONV
spnego_gss_complete_auth_token
(
	OM_uint32 *minor_status,
	const gss_ctx_id_t context_handle,
	gss_buffer_t input_message_buffer
);

OM_uint32 KRB5_CALLCONV
spnego_gss_acquire_cred_impersonate_name(
    OM_uint32 *,	    /* minor_status */
    const gss_cred_id_t,    /* impersonator_cred_handle */
    const gss_name_t,	    /* desired_name */
    OM_uint32,		    /* time_req */
    const gss_OID_set,	    /* desired_mechs */
    gss_cred_usage_t,	    /* cred_usage */
    gss_cred_id_t *,	    /* output_cred_handle */
    gss_OID_set *,	    /* actual_mechs */
    OM_uint32 *);	    /* time_rec */

OM_uint32 KRB5_CALLCONV
spnego_gss_acquire_cred_with_password(
    OM_uint32 *minor_status,
    const gss_name_t desired_name,
    const gss_buffer_t password,
    OM_uint32 time_req,
    const gss_OID_set desired_mechs,
    gss_cred_usage_t cred_usage,
    gss_cred_id_t *output_cred_handle,
    gss_OID_set *actual_mechs,
    OM_uint32 *time_rec);

OM_uint32 KRB5_CALLCONV
spnego_gss_display_name_ext
(
	OM_uint32 *minor_status,
	gss_name_t name,
	gss_OID display_as_name_type,
	gss_buffer_t display_name
);

OM_uint32 KRB5_CALLCONV
spnego_gss_inquire_name
(
	OM_uint32 *minor_status,
	gss_name_t name,
	int *name_is_MN,
	gss_OID *MN_mech,
	gss_buffer_set_t *attrs
);

OM_uint32 KRB5_CALLCONV
spnego_gss_get_name_attribute
(
	OM_uint32 *minor_status,
	gss_name_t name,
	gss_buffer_t attr,
	int *authenticated,
	int *complete,
	gss_buffer_t value,
	gss_buffer_t display_value,
	int *more
);

OM_uint32 KRB5_CALLCONV
spnego_gss_set_name_attribute
(
	OM_uint32 *minor_status,
	gss_name_t name,
	int complete,
	gss_buffer_t attr,
	gss_buffer_t value
);

OM_uint32 KRB5_CALLCONV
spnego_gss_delete_name_attribute
(
	OM_uint32 *minor_status,
	gss_name_t name,
	gss_buffer_t attr
);

OM_uint32 KRB5_CALLCONV
spnego_gss_export_name_composite
(
	OM_uint32 *minor_status,
	gss_name_t name,
	gss_buffer_t exp_composite_name
);

OM_uint32 KRB5_CALLCONV
spnego_gss_map_name_to_any
(
	OM_uint32 *minor_status,
	gss_name_t name,
	int authenticated,
	gss_buffer_t type_id,
	gss_any_t *output
);

OM_uint32 KRB5_CALLCONV
spnego_gss_release_any_name_mapping
(
	OM_uint32 *minor_status,
	gss_name_t name,
	gss_buffer_t type_id,
	gss_any_t *input
);

OM_uint32 KRB5_CALLCONV
spnego_gss_pseudo_random
(
	OM_uint32 *minor_status,
	gss_ctx_id_t context,
	int prf_key,
	const gss_buffer_t prf_in,
	ssize_t desired_output_len,
	gss_buffer_t prf_out
);

OM_uint32 KRB5_CALLCONV
spnego_gss_set_neg_mechs
(
	OM_uint32 *minor_status,
	gss_cred_id_t cred_handle,
	const gss_OID_set mech_list
);

OM_uint32 KRB5_CALLCONV
spnego_gss_inquire_mech_for_saslname
(
	OM_uint32 *minor_status,
	const gss_buffer_t sasl_mech_name,
	gss_OID *mech_type
);

OM_uint32 KRB5_CALLCONV
spnego_gss_inquire_saslname_for_mech
(
	OM_uint32 *minor_status,
	const gss_OID desired_mech,
	gss_buffer_t sasl_mech_name,
	gss_buffer_t mech_name,
	gss_buffer_t mech_description
);

OM_uint32 KRB5_CALLCONV
spnego_gss_inquire_attrs_for_mech
(
	OM_uint32 *minor_status,
	gss_const_OID mech,
	gss_OID_set *mech_attrs,
	gss_OID_set *known_mech_attrs
);

OM_uint32 KRB5_CALLCONV
spnego_gss_acquire_cred_from
(
	OM_uint32 *minor_status,
	const gss_name_t desired_name,
	OM_uint32 time_req,
	const gss_OID_set desired_mechs,
	gss_cred_usage_t cred_usage,
	gss_const_key_value_set_t cred_store,
	gss_cred_id_t *output_cred_handle,
	gss_OID_set *actual_mechs,
	OM_uint32 *time_rec
);

OM_uint32 KRB5_CALLCONV
spnego_gss_export_cred(
	OM_uint32 *minor_status,
	gss_cred_id_t cred_handle,
	gss_buffer_t token
);

OM_uint32 KRB5_CALLCONV
spnego_gss_import_cred(
	OM_uint32 *minor_status,
	gss_buffer_t token,
	gss_cred_id_t *cred_handle
);

OM_uint32 KRB5_CALLCONV
spnego_gss_get_mic_iov(
	OM_uint32 *minor_status,
	gss_ctx_id_t context_handle,
	gss_qop_t qop_req,
	gss_iov_buffer_desc *iov,
	int iov_count
);

OM_uint32 KRB5_CALLCONV
spnego_gss_verify_mic_iov(
	OM_uint32 *minor_status,
	gss_ctx_id_t context_handle,
	gss_qop_t *qop_state,
	gss_iov_buffer_desc *iov,
	int iov_count
);

OM_uint32 KRB5_CALLCONV
spnego_gss_get_mic_iov_length(
	OM_uint32 *minor_status,
	gss_ctx_id_t context_handle,
	gss_qop_t qop_req,
	gss_iov_buffer_desc *iov,
	int iov_count
);

#ifdef	__cplusplus
}
#endif

#endif /* _GSSAPIP_SPNEGO_H_ */