/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2005 Doug Rabson
 * 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
 */

#include <unistd.h>
#include <sys/queue.h>

typedef OM_uint32 _gss_acquire_cred_t
              (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_cred_id_t *,        /* output_cred_handle */
               gss_OID_set *,          /* actual_mechs */
               OM_uint32 *             /* time_rec */
              );

typedef OM_uint32 _gss_release_cred_t
              (OM_uint32 *,            /* minor_status */
               gss_cred_id_t *         /* cred_handle */
              );

typedef OM_uint32 _gss_init_sec_context_t
              (OM_uint32 *,            /* minor_status */
               const gss_cred_id_t,    /* initiator_cred_handle */
               gss_ctx_id_t *,         /* context_handle */
               const gss_name_t,       /* target_name */
               const gss_OID,          /* mech_type */
               OM_uint32,              /* req_flags */
               OM_uint32,              /* time_req */
               const gss_channel_bindings_t,
                                       /* input_chan_bindings */
               const gss_buffer_t,     /* input_token */
               gss_OID *,              /* actual_mech_type */
               gss_buffer_t,           /* output_token */
               OM_uint32 *,            /* ret_flags */
               OM_uint32 *             /* time_rec */
              );

typedef OM_uint32 _gss_accept_sec_context_t
              (OM_uint32 *,            /* minor_status */
               gss_ctx_id_t *,         /* context_handle */
               const gss_cred_id_t,    /* acceptor_cred_handle */
               const gss_buffer_t,     /* input_token_buffer */
               const 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 */
               gss_cred_id_t *         /* delegated_cred_handle */
              );

typedef OM_uint32 _gss_process_context_token_t
              (OM_uint32 *,            /* minor_status */
               const gss_ctx_id_t,     /* context_handle */
               const gss_buffer_t      /* token_buffer */
              );

typedef OM_uint32 _gss_delete_sec_context_t
              (OM_uint32 *,            /* minor_status */
               gss_ctx_id_t *,         /* context_handle */
               gss_buffer_t            /* output_token */
              );

typedef OM_uint32 _gss_context_time_t
              (OM_uint32 *,            /* minor_status */
               const gss_ctx_id_t,     /* context_handle */
               OM_uint32 *             /* time_rec */
              );

typedef OM_uint32 _gss_get_mic_t
              (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 */
              );

typedef OM_uint32 _gss_verify_mic_t
              (OM_uint32 *,            /* minor_status */
               const gss_ctx_id_t,     /* context_handle */
               const gss_buffer_t,     /* message_buffer */
               const gss_buffer_t,     /* token_buffer */
               gss_qop_t *             /* qop_state */
              );

typedef OM_uint32 _gss_wrap_t
              (OM_uint32 *,            /* minor_status */
               const gss_ctx_id_t,     /* context_handle */
               int,                    /* conf_req_flag */
               gss_qop_t,              /* qop_req */
               const gss_buffer_t,     /* input_message_buffer */
               int *,                  /* conf_state */
               gss_buffer_t            /* output_message_buffer */
              );

typedef OM_uint32 _gss_unwrap_t
              (OM_uint32 *,            /* minor_status */
               const gss_ctx_id_t,     /* context_handle */
               const gss_buffer_t,     /* input_message_buffer */
               gss_buffer_t,           /* output_message_buffer */
               int *,                  /* conf_state */
               gss_qop_t *             /* qop_state */
              );

typedef OM_uint32 _gss_display_status_t
              (OM_uint32 *,            /* minor_status */
               OM_uint32,              /* status_value */
               int,                    /* status_type */
               const gss_OID,          /* mech_type */
               OM_uint32 *,            /* message_context */
               gss_buffer_t            /* status_string */
              );

typedef OM_uint32 _gss_indicate_mechs_t
              (OM_uint32 *,            /* minor_status */
               gss_OID_set *           /* mech_set */
              );

typedef OM_uint32 _gss_compare_name_t
              (OM_uint32 *,            /* minor_status */
               const gss_name_t,       /* name1 */
               const gss_name_t,       /* name2 */
               int *                   /* name_equal */
              );

typedef OM_uint32 _gss_display_name_t
              (OM_uint32 *,            /* minor_status */
               const gss_name_t,       /* input_name */
               gss_buffer_t,           /* output_name_buffer */
               gss_OID *               /* output_name_type */
              );

typedef OM_uint32 _gss_import_name_t
              (OM_uint32 *,            /* minor_status */
               const gss_buffer_t,     /* input_name_buffer */
               const gss_OID,          /* input_name_type */
               gss_name_t *            /* output_name */
              );

typedef OM_uint32 _gss_export_name_t
              (OM_uint32 *,            /* minor_status */
               const gss_name_t,       /* input_name */
               gss_buffer_t            /* exported_name */
              );

typedef OM_uint32 _gss_release_name_t
              (OM_uint32 *,            /* minor_status */
               gss_name_t *            /* input_name */
              );

typedef OM_uint32 _gss_inquire_cred_t
              (OM_uint32 *,            /* minor_status */
               const gss_cred_id_t,    /* cred_handle */
               gss_name_t *,           /* name */
               OM_uint32 *,            /* lifetime */
               gss_cred_usage_t *,     /* cred_usage */
               gss_OID_set *           /* mechanisms */
              );

typedef OM_uint32 _gss_inquire_context_t
              (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 *                   /* open */
              );

typedef OM_uint32 _gss_wrap_size_limit_t
              (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 */
              );

typedef OM_uint32 _gss_add_cred_t (
               OM_uint32 *,            /* minor_status */
               const gss_cred_id_t,    /* input_cred_handle */
               const gss_name_t,       /* desired_name */
               const gss_OID,          /* desired_mech */
               gss_cred_usage_t,       /* cred_usage */
               OM_uint32,              /* initiator_time_req */
               OM_uint32,              /* acceptor_time_req */
               gss_cred_id_t *,        /* output_cred_handle */
               gss_OID_set *,          /* actual_mechs */
               OM_uint32 *,            /* initiator_time_rec */
               OM_uint32 *             /* acceptor_time_rec */
              );

typedef OM_uint32 _gss_inquire_cred_by_mech_t (
               OM_uint32 *,            /* minor_status */
               const gss_cred_id_t,    /* cred_handle */
               const gss_OID,          /* mech_type */
               gss_name_t *,           /* name */
               OM_uint32 *,            /* initiator_lifetime */
               OM_uint32 *,            /* acceptor_lifetime */
               gss_cred_usage_t *      /* cred_usage */
              );

typedef OM_uint32 _gss_export_sec_context_t (
               OM_uint32 *,            /* minor_status */
               gss_ctx_id_t *,         /* context_handle */
               gss_buffer_t            /* interprocess_token */
              );

typedef OM_uint32 _gss_import_sec_context_t (
               OM_uint32 *,            /* minor_status */
               const gss_buffer_t,     /* interprocess_token */
               gss_ctx_id_t *          /* context_handle */
              );

typedef OM_uint32 _gss_inquire_names_for_mech_t (
               OM_uint32 *,            /* minor_status */
               const gss_OID,          /* mechanism */
               gss_OID_set *           /* name_types */
              );

typedef OM_uint32 _gss_inquire_mechs_for_name_t (
               OM_uint32 *,            /* minor_status */
               const gss_name_t,       /* input_name */
               gss_OID_set *           /* mech_types */
              );

typedef OM_uint32 _gss_canonicalize_name_t (
               OM_uint32 *,            /* minor_status */
               const gss_name_t,       /* input_name */
               const gss_OID,          /* mech_type */
               gss_name_t *            /* output_name */
              );

typedef OM_uint32 _gss_duplicate_name_t (
               OM_uint32 *,            /* minor_status */
               const gss_name_t,       /* src_name */
               gss_name_t *            /* dest_name */
              );

typedef OM_uint32 _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 *       /* result */
              );

typedef OM_uint32 _gss_inquire_cred_by_oid
              (OM_uint32 *,            /* bminor_status */
               const gss_cred_id_t,    /* cred_handle, */
               const gss_OID,          /* desired_object */
               gss_buffer_set_t *      /* data_set */
              );

typedef OM_uint32 _gss_set_sec_context_option
              (OM_uint32 *,             /* minor status */
               gss_ctx_id_t *,          /* context */
               const gss_OID,           /* option to set */
               const gss_buffer_t       /* option value */
              );

typedef OM_uint32 _gss_set_cred_option
              (OM_uint32 *,             /* minor status */
               gss_cred_id_t *,         /* cred */
               const gss_OID,           /* option to set */
               const gss_buffer_t       /* option value */
              );

typedef OM_uint32 _gss_pseudo_random
              (OM_uint32 *,            /* minor status */
               gss_ctx_id_t,           /* context */
               int,                    /* PRF key */
               const gss_buffer_t,     /* PRF input */
               ssize_t,                /* desired output length */
               gss_buffer_t            /* PRF output */
              );

typedef OM_uint32 _gss_pname_to_uid
              (OM_uint32 *,             /* minor status */
               gss_name_t pname,        /* principal name */
               gss_OID mech,            /* mechanism to query */
               uid_t *uidp              /* pointer to UID for result */
              );

struct _gss_mech_switch {
        SLIST_ENTRY(_gss_mech_switch)   gm_link;
        const char                      *gm_name_prefix;
        gss_OID_desc                    gm_mech_oid;
        void                            *gm_so;
        _gss_acquire_cred_t             *gm_acquire_cred;
        _gss_release_cred_t             *gm_release_cred;
        _gss_init_sec_context_t         *gm_init_sec_context;
        _gss_accept_sec_context_t       *gm_accept_sec_context;
        _gss_process_context_token_t    *gm_process_context_token;
        _gss_delete_sec_context_t       *gm_delete_sec_context;
        _gss_context_time_t             *gm_context_time;
        _gss_get_mic_t                  *gm_get_mic;
        _gss_verify_mic_t               *gm_verify_mic;
        _gss_wrap_t                     *gm_wrap;
        _gss_unwrap_t                   *gm_unwrap;
        _gss_display_status_t           *gm_display_status;
        _gss_indicate_mechs_t           *gm_indicate_mechs;
        _gss_compare_name_t             *gm_compare_name;
        _gss_display_name_t             *gm_display_name;
        _gss_import_name_t              *gm_import_name;
        _gss_export_name_t              *gm_export_name;
        _gss_release_name_t             *gm_release_name;
        _gss_inquire_cred_t             *gm_inquire_cred;
        _gss_inquire_context_t          *gm_inquire_context;
        _gss_wrap_size_limit_t          *gm_wrap_size_limit;
        _gss_add_cred_t                 *gm_add_cred;
        _gss_inquire_cred_by_mech_t     *gm_inquire_cred_by_mech;
        _gss_export_sec_context_t       *gm_export_sec_context;
        _gss_import_sec_context_t       *gm_import_sec_context;
        _gss_inquire_names_for_mech_t   *gm_inquire_names_for_mech;
        _gss_inquire_mechs_for_name_t   *gm_inquire_mechs_for_name;
        _gss_canonicalize_name_t        *gm_canonicalize_name;
        _gss_duplicate_name_t           *gm_duplicate_name;
        _gss_inquire_sec_context_by_oid *gm_inquire_sec_context_by_oid;
        _gss_inquire_cred_by_oid        *gm_inquire_cred_by_oid;
        _gss_set_sec_context_option     *gm_set_sec_context_option;
        _gss_set_cred_option            *gm_set_cred_option;
        _gss_pseudo_random              *gm_pseudo_random;
        _gss_pname_to_uid               *gm_pname_to_uid;
};
SLIST_HEAD(_gss_mech_switch_list, _gss_mech_switch);
extern struct _gss_mech_switch_list _gss_mechs;
extern gss_OID_set _gss_mech_oids;

extern void _gss_load_mech(void);
extern struct _gss_mech_switch *_gss_find_mech_switch(gss_OID);
extern void _gss_mg_error(struct _gss_mech_switch *m, OM_uint32 maj,
    OM_uint32 min);
extern void _gss_mg_collect_error(gss_OID mech, OM_uint32 maj, OM_uint32 min);