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/* -*- mode: c; indent-tabs-mode: nil -*- */
/*
 * Copyright 1993 by OpenVision Technologies, Inc.
 *
 * Permission to use, copy, modify, distribute, and sell this software
 * and its documentation for any purpose is hereby granted without fee,
 * provided that the above copyright notice appears in all copies and
 * that both that copyright notice and this permission notice appear in
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 * in advertising or publicity pertaining to distribution of the software
 * without specific, written prior permission. OpenVision makes no
 * representations about the suitability of this software for any
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 *
 * OPENVISION DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 * EVENT SHALL OPENVISION BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
 * USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
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 * PERFORMANCE OF THIS SOFTWARE.
 */

#ifndef _GSSAPI_KRB5_H_
#define _GSSAPI_KRB5_H_

#include <gssapi/gssapi.h>
#include <gssapi/gssapi_ext.h>
#include <krb5.h>
#include <stdint.h>

/* C++ friendlyness */
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */

/* Reserved static storage for GSS_oids.  See rfc 1964 for more details. */

/* 2.1.1. Kerberos Principal Name Form: */
GSS_DLLIMP extern const gss_OID GSS_KRB5_NT_PRINCIPAL_NAME;
/* This name form shall be represented by the Object Identifier {iso(1)
 * member-body(2) United States(840) mit(113554) infosys(1) gssapi(2)
 * krb5(2) krb5_name(1)}.  The recommended symbolic name for this type
 * is "GSS_KRB5_NT_PRINCIPAL_NAME". */

/* 2.1.2. Host-Based Service Name Form */
#define GSS_KRB5_NT_HOSTBASED_SERVICE_NAME GSS_C_NT_HOSTBASED_SERVICE
/* This name form shall be represented by the Object Identifier {iso(1)
 * member-body(2) United States(840) mit(113554) infosys(1) gssapi(2)
 * generic(1) service_name(4)}.  The previously recommended symbolic
 * name for this type is "GSS_KRB5_NT_HOSTBASED_SERVICE_NAME".  The
 * currently preferred symbolic name for this type is
 * "GSS_C_NT_HOSTBASED_SERVICE". */

/* 2.2.1. User Name Form */
#define GSS_KRB5_NT_USER_NAME GSS_C_NT_USER_NAME
/* This name form shall be represented by the Object Identifier {iso(1)
 * member-body(2) United States(840) mit(113554) infosys(1) gssapi(2)
 * generic(1) user_name(1)}.  The recommended symbolic name for this
 * type is "GSS_KRB5_NT_USER_NAME". */

/* 2.2.2. Machine UID Form */
#define GSS_KRB5_NT_MACHINE_UID_NAME GSS_C_NT_MACHINE_UID_NAME
/* This name form shall be represented by the Object Identifier {iso(1)
 * member-body(2) United States(840) mit(113554) infosys(1) gssapi(2)
 * generic(1) machine_uid_name(2)}.  The recommended symbolic name for
 * this type is "GSS_KRB5_NT_MACHINE_UID_NAME". */

/* 2.2.3. String UID Form */
#define GSS_KRB5_NT_STRING_UID_NAME GSS_C_NT_STRING_UID_NAME
/* This name form shall be represented by the Object Identifier {iso(1)
 * member-body(2) United States(840) mit(113554) infosys(1) gssapi(2)
 * generic(1) string_uid_name(3)}.  The recommended symbolic name for
 * this type is "GSS_KRB5_NT_STRING_UID_NAME". */

/* Kerberos Enterprise Name Form (see RFC 6806 section 5): */
GSS_DLLIMP extern const gss_OID GSS_KRB5_NT_ENTERPRISE_NAME;
/* {iso(1) member-body(2) United States(840) mit(113554) infosys(1) gssapi(2)
 * krb5(2) krb5-enterprise-name(6)}. */

GSS_DLLIMP extern const gss_OID gss_mech_krb5;
GSS_DLLIMP extern const gss_OID gss_mech_krb5_old;
GSS_DLLIMP extern const gss_OID gss_mech_krb5_wrong;
GSS_DLLIMP extern const gss_OID gss_mech_iakerb;
GSS_DLLIMP extern const gss_OID_set gss_mech_set_krb5;
GSS_DLLIMP extern const gss_OID_set gss_mech_set_krb5_old;
GSS_DLLIMP extern const gss_OID_set gss_mech_set_krb5_both;

GSS_DLLIMP extern const gss_OID gss_nt_krb5_name;
GSS_DLLIMP extern const gss_OID gss_nt_krb5_principal;

GSS_DLLIMP extern const gss_OID_desc krb5_gss_oid_array[];

/*
 * This OID can be used with gss_set_cred_option() to suppress the
 * confidentiality and integrity flags from being asserted in initial context
 * tokens.
 *
 * iso(1) member-body(2) Sweden(752) Stockholm University(43) Heimdal GSS-API
 * Extensions(13) no_ci_flags(29)
 */
GSS_DLLIMP extern const gss_OID GSS_KRB5_CRED_NO_CI_FLAGS_X;

/*
 * This OID can be used with gss_inquire_cred_by_oid(0 to retrieve the
 * impersonator name (if any).
 *
 * iso(1) member-body(2) United States(840) mit(113554) infosys(1) gssapi(2)
 * krb5(2) krb5-gssapi-ext(5) get-cred-impersonator(14)
 */
GSS_DLLIMP extern const gss_OID GSS_KRB5_GET_CRED_IMPERSONATOR;

#define gss_krb5_nt_general_name        gss_nt_krb5_name
#define gss_krb5_nt_principal           gss_nt_krb5_principal
#define gss_krb5_nt_service_name        gss_nt_service_name
#define gss_krb5_nt_user_name           gss_nt_user_name
#define gss_krb5_nt_machine_uid_name    gss_nt_machine_uid_name
#define gss_krb5_nt_string_uid_name     gss_nt_string_uid_name

typedef struct gss_krb5_lucid_key {
    OM_uint32       type;           /* key encryption type */
    OM_uint32       length;         /* length of key data */
    void *          data;           /* actual key data */
} gss_krb5_lucid_key_t;

typedef struct gss_krb5_rfc1964_keydata {
    OM_uint32       sign_alg;       /* signing algorthm */
    OM_uint32       seal_alg;       /* seal/encrypt algorithm */
    gss_krb5_lucid_key_t    ctx_key;
    /* Context key
       (Kerberos session key or subkey) */
} gss_krb5_rfc1964_keydata_t;

typedef struct gss_krb5_cfx_keydata {
    OM_uint32               have_acceptor_subkey;
    /* 1 if there is an acceptor_subkey
       present, 0 otherwise */
    gss_krb5_lucid_key_t    ctx_key;
    /* Context key
       (Kerberos session key or subkey) */
    gss_krb5_lucid_key_t    acceptor_subkey;
    /* acceptor-asserted subkey or
       0's if no acceptor subkey */
} gss_krb5_cfx_keydata_t;

typedef struct gss_krb5_lucid_context_v1 {
    OM_uint32       version;        /* Structure version number (1)
                                       MUST be at beginning of struct! */
    OM_uint32       initiate;       /* Are we the initiator? */
    OM_uint32       endtime;        /* expiration time of context */
    uint64_t        send_seq;       /* sender sequence number */
    uint64_t        recv_seq;       /* receive sequence number */
    OM_uint32       protocol;       /* 0: rfc1964,
                                       1: draft-ietf-krb-wg-gssapi-cfx-07 */
    /*
     * if (protocol == 0) rfc1964_kd should be used
     * and cfx_kd contents are invalid and should be zero
     * if (protocol == 1) cfx_kd should be used
     * and rfc1964_kd contents are invalid and should be zero
     */
    gss_krb5_rfc1964_keydata_t rfc1964_kd;
    gss_krb5_cfx_keydata_t     cfx_kd;
} gss_krb5_lucid_context_v1_t;

/*
 * Mask for determining the version of a lucid context structure.  Callers
 * should not require this.
 */
typedef struct gss_krb5_lucid_context_version {
    OM_uint32       version;        /* Structure version number */
} gss_krb5_lucid_context_version_t;

/* Alias for Heimdal compat. */
#define gsskrb5_register_acceptor_identity krb5_gss_register_acceptor_identity

OM_uint32 KRB5_CALLCONV krb5_gss_register_acceptor_identity(const char *);

OM_uint32 KRB5_CALLCONV gss_krb5_get_tkt_flags(
    OM_uint32 *minor_status,
    gss_ctx_id_t context_handle,
    krb5_flags *ticket_flags);

/*
 * Copy krb5 creds from cred_handle into out_ccache, which must already be
 * initialized.  Use gss_store_cred_into() (new in krb5 1.11) instead, if
 * possible.
 */
OM_uint32 KRB5_CALLCONV gss_krb5_copy_ccache(
    OM_uint32 *minor_status,
    gss_cred_id_t cred_handle,
    krb5_ccache out_ccache);

OM_uint32 KRB5_CALLCONV gss_krb5_ccache_name(
    OM_uint32 *minor_status, const char *name,
    const char **out_name);

/*
 * gss_krb5_set_allowable_enctypes
 *
 * This function may be called by a context initiator after calling
 * gss_acquire_cred(), but before calling gss_init_sec_context(),
 * to restrict the set of enctypes which will be negotiated during
 * context establishment to those in the provided array.
 *
 * 'cred' must be a valid credential handle obtained via
 * gss_acquire_cred().  It may not be GSS_C_NO_CREDENTIAL.
 * gss_acquire_cred() may have been called to get a handle to
 * the default credential.
 *
 * The purpose of this function is to limit the keys that may
 * be exported via gss_krb5_export_lucid_sec_context(); thus it
 * should limit the enctypes of all keys that will be needed
 * after the security context has been established.
 * (i.e. context establishment may use a session key with a
 * stronger enctype than in the provided array, however a
 * subkey must be established within the enctype limits
 * established by this function.)
 *
 */
OM_uint32 KRB5_CALLCONV
gss_krb5_set_allowable_enctypes(OM_uint32 *minor_status,
                                gss_cred_id_t cred,
                                OM_uint32 num_ktypes,
                                krb5_enctype *ktypes);

/*
 * Returns a non-opaque (lucid) version of the internal context
 * information.
 *
 * Note that context_handle must not be used again by the caller
 * after this call.  The GSS implementation is free to release any
 * resources associated with the original context.  It is up to the
 * GSS implementation whether it returns pointers to existing data,
 * or copies of the data.  The caller should treat the returned
 * lucid context as read-only.
 *
 * The caller must call gss_krb5_free_lucid_context() to free
 * the context and allocated resources when it is finished with it.
 *
 * 'version' is an integer indicating the requested version of the lucid
 * context.  If the implementation does not understand the requested version,
 * it will return an error.
 *
 * For example:
 *      void *return_ctx;
 *      gss_krb5_lucid_context_v1_t *ctx;
 *      OM_uint32 min_stat, maj_stat;
 *      OM_uint32 vers;
 *      gss_ctx_id_t *ctx_handle;
 *
 *      maj_stat = gss_krb5_export_lucid_sec_context(&min_stat,
 *                      ctx_handle, 1, &return_ctx);
 *      // Verify success
 *      ctx = (gss_krb5_lucid_context_v1_t *) return_ctx;
 */

OM_uint32 KRB5_CALLCONV
gss_krb5_export_lucid_sec_context(OM_uint32 *minor_status,
                                  gss_ctx_id_t *context_handle,
                                  OM_uint32 version,
                                  void **kctx);

/*
 * Frees the allocated storage associated with an
 * exported struct gss_krb5_lucid_context.
 */
OM_uint32 KRB5_CALLCONV
gss_krb5_free_lucid_sec_context(OM_uint32 *minor_status,
                                void *kctx);

OM_uint32 KRB5_CALLCONV
gsskrb5_extract_authz_data_from_sec_context(OM_uint32 *minor_status,
                                            const gss_ctx_id_t context_handle,
                                            int ad_type,
                                            gss_buffer_t ad_data);

OM_uint32 KRB5_CALLCONV
gss_krb5_set_cred_rcache(OM_uint32 *minor_status,
                         gss_cred_id_t cred,
                         krb5_rcache rcache);

OM_uint32 KRB5_CALLCONV
gsskrb5_extract_authtime_from_sec_context(OM_uint32 *, gss_ctx_id_t, krb5_timestamp *);

OM_uint32 KRB5_CALLCONV
gss_krb5_import_cred(OM_uint32 *minor_status,
                     krb5_ccache id,
                     krb5_principal keytab_principal,
                     krb5_keytab keytab,
                     gss_cred_id_t *cred);

#ifdef __cplusplus
}
#endif /* __cplusplus */

#endif /* _GSSAPI_KRB5_H_ */

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