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Edit File : kdcpreauth_plugin.h \| Size : 17.12 KB
/* -- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -- / / * Copyright (c) 2006 Red Hat, Inc. * Portions copyright (c) 2006, 2011 Massachusetts Institute of Technology * All Rights Reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 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. * * Neither the name of Red Hat, Inc., nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER * 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. / / * Declarations for kdcpreauth plugin module implementors. * * The kdcpreauth interface has a single supported major version, which is 1. * Major version 1 has a current minor version of 2. kdcpreauth modules should * define a function named kdcpreauth_<modulename>_initvt, matching the * signature: * * krb5_error_code * kdcpreauth_modname_initvt(krb5_context context, int maj_ver, int min_ver, * krb5_plugin_vtable vtable); * * The initvt function should: * * - Check that the supplied maj_ver number is supported by the module, or * return KRB5_PLUGIN_VER_NOTSUPP if it is not. * * - Cast the vtable pointer as appropriate for the interface and maj_ver: * kdcpreauth, maj_ver == 1: Cast to krb5_kdcpreauth_vtable * * - Initialize the methods of the vtable, stopping as appropriate for the * supplied min_ver. Optional methods may be left uninitialized. * * Memory for the vtable is allocated by the caller, not by the module. / #ifndef KRB5_KDCPREAUTH_PLUGIN_H #define KRB5_KDCPREAUTH_PLUGIN_H #include <krb5/krb5.h> #include <krb5/plugin.h> / kdcpreauth mechanism property flags / / * Causes the KDC to include this mechanism in a list of supported preauth * types if the user's DB entry flags the user as requiring hardware-based * preauthentication. / #define PA_HARDWARE 0x00000004 / * Causes the KDC to include this mechanism in a list of supported preauth * types if the user's DB entry flags the user as requiring preauthentication, * and to fail preauthentication if we can't verify the client data. The * flipside of PA_SUFFICIENT. / #define PA_REQUIRED 0x00000008 / * Causes the KDC to include this mechanism in a list of supported preauth * types if the user's DB entry flags the user as requiring preauthentication, * and to mark preauthentication as successful if we can verify the client * data. The flipside of PA_REQUIRED. / #define PA_SUFFICIENT 0x00000010 / * Marks this preauthentication mechanism as one which changes the key which is * used for encrypting the response to the client. Modules which have this * flag have their server_return_fn called before modules which do not, and are * passed over if a previously-called module has modified the encrypting key. / #define PA_REPLACES_KEY 0x00000020 / * Not really a padata type, so don't include it in any list of preauth types * which gets sent over the wire. / #define PA_PSEUDO 0x00000080 / * Indicates that e_data in non-FAST errors should be encoded as typed data * instead of padata. / #define PA_TYPED_E_DATA 0x00000100 / Abstract type for a KDC callback data handle. / typedef struct krb5_kdcpreauth_rock_st krb5_kdcpreauth_rock; /* Abstract type for module data and per-request module data. / typedef struct krb5_kdcpreauth_moddata_st krb5_kdcpreauth_moddata; typedef struct krb5_kdcpreauth_modreq_st krb5_kdcpreauth_modreq; / The verto context structure type (typedef is in verto.h; we want to avoid a * header dependency for the moment). / struct verto_ctx; / Before using a callback after version 1, modules must check the vers * field of the callback structure. / typedef struct krb5_kdcpreauth_callbacks_st { int vers; krb5_deltat (max_time_skew)(krb5_context context, krb5_kdcpreauth_rock rock); /* * Get an array of krb5_keyblock structures containing the client keys * matching the request enctypes, terminated by an entry with key type = 0. * Returns ENOENT if no keys are available for the request enctypes. Free * the resulting object with the free_keys callback. / krb5_error_code (client_keys)(krb5_context context, krb5_kdcpreauth_rock rock, krb5_keyblock *keys_out); / Free the result of client_keys. / void (free_keys)(krb5_context context, krb5_kdcpreauth_rock rock, krb5_keyblock keys); / * Get the encoded request body, which is sometimes needed for checksums. * For a FAST request this is the encoded inner request body. The returned * pointer is an alias and should not be freed. / krb5_data (request_body)(krb5_context context, krb5_kdcpreauth_rock rock); / Get a pointer to the FAST armor key, or NULL if the request did not use * FAST. The returned pointer is an alias and should not be freed. / krb5_keyblock (fast_armor)(krb5_context context, krb5_kdcpreauth_rock rock); / Retrieve a string attribute from the client DB entry, or NULL if no such * attribute is set. Free the result with the free_string callback. / krb5_error_code (get_string)(krb5_context context, krb5_kdcpreauth_rock rock, const char key, char value_out); / Free the result of get_string. / void (free_string)(krb5_context context, krb5_kdcpreauth_rock rock, char string); / Get a pointer to the client DB entry (returned as a void pointer to * avoid a dependency on a libkdb5 type). / void (client_entry)(krb5_context context, krb5_kdcpreauth_rock rock); / Get a pointer to the verto context which should be used by an * asynchronous edata or verify method. / struct verto_ctx (event_context)(krb5_context context, krb5_kdcpreauth_rock rock); / End of version 1 kdcpreauth callbacks. / / Return true if the client DB entry contains any keys matching the * request enctypes. / krb5_boolean (have_client_keys)(krb5_context context, krb5_kdcpreauth_rock rock); /* End of version 2 kdcpreauth callbacks. / / * Get the decrypted client long-term key chosen according to the request * enctype list, or NULL if no matching key was found. The returned * pointer is an alias and should not be freed. If invoked from * return_padata, the result will be the same as the encrypting_key * parameter if it is not NULL, and will therefore reflect the modified * reply key if a return_padata handler has replaced the reply key. / const krb5_keyblock (client_keyblock)(krb5_context context, krb5_kdcpreauth_rock rock); / Assert an authentication indicator in the AS-REP authdata. Duplicate * indicators will be ignored. / krb5_error_code (add_auth_indicator)(krb5_context context, krb5_kdcpreauth_rock rock, const char indicator); / * Read a data value for pa_type from the request cookie, placing it in * out. The value placed there is an alias and must not be freed. Returns true if a value for pa_type was retrieved, false if not. / krb5_boolean (get_cookie)(krb5_context context, krb5_kdcpreauth_rock rock, krb5_preauthtype pa_type, krb5_data out); / * Set a data value for pa_type to be sent in a secure cookie in the next * error response. If pa_type is already present, the value is ignored. * If the preauth mechanism has different preauth types for requests and * responses, use the request type. Secure cookies are encrypted in a key * known only to the KDCs, but can be replayed within a short time window * for requests using the same client principal. / krb5_error_code (set_cookie)(krb5_context context, krb5_kdcpreauth_rock rock, krb5_preauthtype pa_type, const krb5_data data); / End of version 3 kdcpreauth callbacks. / / * Return true if princ matches the principal named in the request or the * client principal (possibly canonicalized). If princ does not match, * attempt a database lookup of princ with aliases allowed and compare the * result to the client principal, returning true if it matches. * Otherwise, return false. / krb5_boolean (match_client)(krb5_context context, krb5_kdcpreauth_rock rock, krb5_principal princ); /* * Get an alias to the client DB entry principal (possibly canonicalized). / krb5_principal (client_name)(krb5_context context, krb5_kdcpreauth_rock rock); /* End of version 4 kdcpreauth callbacks. / / * Instruct the KDC to send a freshness token in the method data * accompanying a PREAUTH_REQUIRED or PREAUTH_FAILED error, if the client * indicated support for freshness tokens. This callback should only be * invoked from the edata method. / void (send_freshness_token)(krb5_context context, krb5_kdcpreauth_rock rock); /* Validate a freshness token sent by the client. Return 0 on success, * KRB5KDC_ERR_PREAUTH_EXPIRED on error. / krb5_error_code (check_freshness_token)(krb5_context context, krb5_kdcpreauth_rock rock, const krb5_data token); / End of version 5 kdcpreauth callbacks. / } krb5_kdcpreauth_callbacks; /* Optional: preauth plugin initialization function. / typedef krb5_error_code (krb5_kdcpreauth_init_fn)(krb5_context context, krb5_kdcpreauth_moddata moddata_out, const char realmnames); / Optional: preauth plugin cleanup function. / typedef void (krb5_kdcpreauth_fini_fn)(krb5_context context, krb5_kdcpreauth_moddata moddata); /* * Optional: return the flags which the KDC should use for this module. This * is a callback instead of a static value because the module may or may not * wish to count itself as a hardware preauthentication module (in other words, * the flags may be affected by the configuration, for example if a site * administrator can force a particular preauthentication type to be supported * using only hardware). This function is called for each entry entry in the * server_pa_type_list. / typedef int (krb5_kdcpreauth_flags_fn)(krb5_context context, krb5_preauthtype pa_type); /* * Responder for krb5_kdcpreauth_edata_fn. If invoked with a non-zero code, pa * will be ignored and the padata type will not be included in the hint list. * If invoked with a zero code and a null pa value, the padata type will be * included in the list with an empty value. If invoked with a zero code and a * non-null pa value, pa will be included in the hint list and will later be * freed by the KDC. / typedef void (krb5_kdcpreauth_edata_respond_fn)(void arg, krb5_error_code code, krb5_pa_data pa); /* * Optional: provide pa_data to send to the client as part of the "you need to * use preauthentication" error. The implementation must invoke the respond * when complete, whether successful or not, either before returning or * asynchronously using the verto context returned by cb->event_context(). * * This function is not allowed to create a modreq object because we have no * guarantee that the client will ever make a follow-up request, or that it * will hit this KDC if it does. / typedef void (krb5_kdcpreauth_edata_fn)(krb5_context context, krb5_kdc_req request, krb5_kdcpreauth_callbacks cb, krb5_kdcpreauth_rock rock, krb5_kdcpreauth_moddata moddata, krb5_preauthtype pa_type, krb5_kdcpreauth_edata_respond_fn respond, void arg); /* * Responder for krb5_kdcpreauth_verify_fn. Invoke with the arg parameter * supplied to verify, the error code (0 for success), an optional module * request state object to be consumed by return_fn or free_modreq_fn, optional * e_data to be passed to the caller if code is nonzero, and optional * authorization data to be included in the ticket. In non-FAST replies, * e_data will be encoded as typed-data if the module sets the PA_TYPED_E_DATA * flag, and as pa-data otherwise. e_data and authz_data will be freed by the * KDC. / typedef void (krb5_kdcpreauth_verify_respond_fn)(void arg, krb5_error_code code, krb5_kdcpreauth_modreq modreq, krb5_pa_data e_data, krb5_authdata authz_data); / * Optional: verify preauthentication data sent by the client, setting the * TKT_FLG_PRE_AUTH or TKT_FLG_HW_AUTH flag in the enc_tkt_reply's "flags" * field as appropriate. The implementation must invoke the respond function * when complete, whether successful or not, either before returning or * asynchronously using the verto context returned by cb->event_context(). / typedef void (krb5_kdcpreauth_verify_fn)(krb5_context context, krb5_data req_pkt, krb5_kdc_req request, krb5_enc_tkt_part enc_tkt_reply, krb5_pa_data data, krb5_kdcpreauth_callbacks cb, krb5_kdcpreauth_rock rock, krb5_kdcpreauth_moddata moddata, krb5_kdcpreauth_verify_respond_fn respond, void arg); / * Optional: generate preauthentication response data to send to the client as * part of the AS-REP. If it needs to override the key which is used to * encrypt the response, it can do so. / typedef krb5_error_code (krb5_kdcpreauth_return_fn)(krb5_context context, krb5_pa_data padata, krb5_data req_pkt, krb5_kdc_req request, krb5_kdc_rep reply, krb5_keyblock encrypting_key, krb5_pa_data send_pa_out, krb5_kdcpreauth_callbacks cb, krb5_kdcpreauth_rock rock, krb5_kdcpreauth_moddata moddata, krb5_kdcpreauth_modreq modreq); / Optional: free a per-request context. / typedef void (krb5_kdcpreauth_free_modreq_fn)(krb5_context, krb5_kdcpreauth_moddata moddata, krb5_kdcpreauth_modreq modreq); /* Optional: invoked after init_fn to provide the module with a pointer to the * verto main loop. / typedef krb5_error_code (krb5_kdcpreauth_loop_fn)(krb5_context context, krb5_kdcpreauth_moddata moddata, struct verto_ctx ctx); typedef struct krb5_kdcpreauth_vtable_st { / Mandatory: name of module. / char name; /* Mandatory: pointer to zero-terminated list of pa_types which this module * can provide services for. / krb5_preauthtype pa_type_list; krb5_kdcpreauth_init_fn init; krb5_kdcpreauth_fini_fn fini; krb5_kdcpreauth_flags_fn flags; krb5_kdcpreauth_edata_fn edata; krb5_kdcpreauth_verify_fn verify; krb5_kdcpreauth_return_fn return_padata; krb5_kdcpreauth_free_modreq_fn free_modreq; /* Minor 1 ends here. / krb5_kdcpreauth_loop_fn loop; / Minor 2 ends here. / } krb5_kdcpreauth_vtable; #endif /* KRB5_KDCPREAUTH_PLUGIN_H */ Back

Edit File : kdcpreauth_plugin.h | Size : 17.12 KB

/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
 * Copyright (c) 2006 Red Hat, Inc.
 * Portions copyright (c) 2006, 2011 Massachusetts Institute of Technology
 * All Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  * 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.
 *  * Neither the name of Red Hat, Inc., nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER
 * 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.
 */

/*
 * Declarations for kdcpreauth plugin module implementors.
 *
 * The kdcpreauth interface has a single supported major version, which is 1.
 * Major version 1 has a current minor version of 2.  kdcpreauth modules should
 * define a function named kdcpreauth_<modulename>_initvt, matching the
 * signature:
 *
 *   krb5_error_code
 *   kdcpreauth_modname_initvt(krb5_context context, int maj_ver, int min_ver,
 *                             krb5_plugin_vtable vtable);
 *
 * The initvt function should:
 *
 * - Check that the supplied maj_ver number is supported by the module, or
 *   return KRB5_PLUGIN_VER_NOTSUPP if it is not.
 *
 * - Cast the vtable pointer as appropriate for the interface and maj_ver:
 *     kdcpreauth, maj_ver == 1: Cast to krb5_kdcpreauth_vtable
 *
 * - Initialize the methods of the vtable, stopping as appropriate for the
 *   supplied min_ver.  Optional methods may be left uninitialized.
 *
 * Memory for the vtable is allocated by the caller, not by the module.
 */

#ifndef KRB5_KDCPREAUTH_PLUGIN_H
#define KRB5_KDCPREAUTH_PLUGIN_H

#include <krb5/krb5.h>
#include <krb5/plugin.h>

/* kdcpreauth mechanism property flags */

/*
 * Causes the KDC to include this mechanism in a list of supported preauth
 * types if the user's DB entry flags the user as requiring hardware-based
 * preauthentication.
 */
#define PA_HARDWARE     0x00000004

/*
 * Causes the KDC to include this mechanism in a list of supported preauth
 * types if the user's DB entry flags the user as requiring preauthentication,
 * and to fail preauthentication if we can't verify the client data.  The
 * flipside of PA_SUFFICIENT.
 */
#define PA_REQUIRED     0x00000008

/*
 * Causes the KDC to include this mechanism in a list of supported preauth
 * types if the user's DB entry flags the user as requiring preauthentication,
 * and to mark preauthentication as successful if we can verify the client
 * data.  The flipside of PA_REQUIRED.
 */
#define PA_SUFFICIENT   0x00000010

/*
 * Marks this preauthentication mechanism as one which changes the key which is
 * used for encrypting the response to the client.  Modules which have this
 * flag have their server_return_fn called before modules which do not, and are
 * passed over if a previously-called module has modified the encrypting key.
 */
#define PA_REPLACES_KEY 0x00000020

/*
 * Not really a padata type, so don't include it in any list of preauth types
 * which gets sent over the wire.
 */
#define PA_PSEUDO       0x00000080

/*
 * Indicates that e_data in non-FAST errors should be encoded as typed data
 * instead of padata.
 */
#define PA_TYPED_E_DATA 0x00000100

/* Abstract type for a KDC callback data handle. */
typedef struct krb5_kdcpreauth_rock_st *krb5_kdcpreauth_rock;

/* Abstract type for module data and per-request module data. */
typedef struct krb5_kdcpreauth_moddata_st *krb5_kdcpreauth_moddata;
typedef struct krb5_kdcpreauth_modreq_st *krb5_kdcpreauth_modreq;

/* The verto context structure type (typedef is in verto.h; we want to avoid a
 * header dependency for the moment). */
struct verto_ctx;

/* Before using a callback after version 1, modules must check the vers
 * field of the callback structure. */
typedef struct krb5_kdcpreauth_callbacks_st {
    int vers;

krb5_deltat (*max_time_skew)(krb5_context context,
                                 krb5_kdcpreauth_rock rock);

/*
     * Get an array of krb5_keyblock structures containing the client keys
     * matching the request enctypes, terminated by an entry with key type = 0.
     * Returns ENOENT if no keys are available for the request enctypes.  Free
     * the resulting object with the free_keys callback.
     */
    krb5_error_code (*client_keys)(krb5_context context,
                                   krb5_kdcpreauth_rock rock,
                                   krb5_keyblock **keys_out);

/* Free the result of client_keys. */
    void (*free_keys)(krb5_context context, krb5_kdcpreauth_rock rock,
                      krb5_keyblock *keys);

/*
     * Get the encoded request body, which is sometimes needed for checksums.
     * For a FAST request this is the encoded inner request body.  The returned
     * pointer is an alias and should not be freed.
     */
    krb5_data *(*request_body)(krb5_context context,
                               krb5_kdcpreauth_rock rock);

/* Get a pointer to the FAST armor key, or NULL if the request did not use
     * FAST.  The returned pointer is an alias and should not be freed. */
    krb5_keyblock *(*fast_armor)(krb5_context context,
                                 krb5_kdcpreauth_rock rock);

/* Retrieve a string attribute from the client DB entry, or NULL if no such
     * attribute is set.  Free the result with the free_string callback. */
    krb5_error_code (*get_string)(krb5_context context,
                                  krb5_kdcpreauth_rock rock, const char *key,
                                  char **value_out);

/* Free the result of get_string. */
    void (*free_string)(krb5_context context, krb5_kdcpreauth_rock rock,
                        char *string);

/* Get a pointer to the client DB entry (returned as a void pointer to
     * avoid a dependency on a libkdb5 type). */
    void *(*client_entry)(krb5_context context, krb5_kdcpreauth_rock rock);

/* Get a pointer to the verto context which should be used by an
     * asynchronous edata or verify method. */
    struct verto_ctx *(*event_context)(krb5_context context,
                                       krb5_kdcpreauth_rock rock);

/* End of version 1 kdcpreauth callbacks. */

/* Return true if the client DB entry contains any keys matching the
     * request enctypes. */
    krb5_boolean (*have_client_keys)(krb5_context context,
                                     krb5_kdcpreauth_rock rock);

/* End of version 2 kdcpreauth callbacks. */

/*
     * Get the decrypted client long-term key chosen according to the request
     * enctype list, or NULL if no matching key was found.  The returned
     * pointer is an alias and should not be freed.  If invoked from
     * return_padata, the result will be the same as the encrypting_key
     * parameter if it is not NULL, and will therefore reflect the modified
     * reply key if a return_padata handler has replaced the reply key.
     */
    const krb5_keyblock *(*client_keyblock)(krb5_context context,
                                            krb5_kdcpreauth_rock rock);

/* Assert an authentication indicator in the AS-REP authdata.  Duplicate
     * indicators will be ignored. */
    krb5_error_code (*add_auth_indicator)(krb5_context context,
                                          krb5_kdcpreauth_rock rock,
                                          const char *indicator);

/*
     * Read a data value for pa_type from the request cookie, placing it in
     * *out.  The value placed there is an alias and must not be freed.
     * Returns true if a value for pa_type was retrieved, false if not.
     */
    krb5_boolean (*get_cookie)(krb5_context context, krb5_kdcpreauth_rock rock,
                               krb5_preauthtype pa_type, krb5_data *out);

/*
     * Set a data value for pa_type to be sent in a secure cookie in the next
     * error response.  If pa_type is already present, the value is ignored.
     * If the preauth mechanism has different preauth types for requests and
     * responses, use the request type.  Secure cookies are encrypted in a key
     * known only to the KDCs, but can be replayed within a short time window
     * for requests using the same client principal.
     */
    krb5_error_code (*set_cookie)(krb5_context context,
                                  krb5_kdcpreauth_rock rock,
                                  krb5_preauthtype pa_type,
                                  const krb5_data *data);

/* End of version 3 kdcpreauth callbacks. */

/*
     * Return true if princ matches the principal named in the request or the
     * client principal (possibly canonicalized).  If princ does not match,
     * attempt a database lookup of princ with aliases allowed and compare the
     * result to the client principal, returning true if it matches.
     * Otherwise, return false.
     */
    krb5_boolean (*match_client)(krb5_context context,
                                 krb5_kdcpreauth_rock rock,
                                 krb5_principal princ);

/*
     * Get an alias to the client DB entry principal (possibly canonicalized).
     */
    krb5_principal (*client_name)(krb5_context context,
                                  krb5_kdcpreauth_rock rock);

/* End of version 4 kdcpreauth callbacks. */

/*
     * Instruct the KDC to send a freshness token in the method data
     * accompanying a PREAUTH_REQUIRED or PREAUTH_FAILED error, if the client
     * indicated support for freshness tokens.  This callback should only be
     * invoked from the edata method.
     */
    void (*send_freshness_token)(krb5_context context,
                                 krb5_kdcpreauth_rock rock);

/* Validate a freshness token sent by the client.  Return 0 on success,
     * KRB5KDC_ERR_PREAUTH_EXPIRED on error. */
    krb5_error_code (*check_freshness_token)(krb5_context context,
                                             krb5_kdcpreauth_rock rock,
                                             const krb5_data *token);

/* End of version 5 kdcpreauth callbacks. */

} *krb5_kdcpreauth_callbacks;

/* Optional: preauth plugin initialization function. */
typedef krb5_error_code
(*krb5_kdcpreauth_init_fn)(krb5_context context,
                           krb5_kdcpreauth_moddata *moddata_out,
                           const char **realmnames);

/* Optional: preauth plugin cleanup function. */
typedef void
(*krb5_kdcpreauth_fini_fn)(krb5_context context,
                           krb5_kdcpreauth_moddata moddata);

/*
 * Optional: return the flags which the KDC should use for this module.  This
 * is a callback instead of a static value because the module may or may not
 * wish to count itself as a hardware preauthentication module (in other words,
 * the flags may be affected by the configuration, for example if a site
 * administrator can force a particular preauthentication type to be supported
 * using only hardware).  This function is called for each entry entry in the
 * server_pa_type_list.
 */
typedef int
(*krb5_kdcpreauth_flags_fn)(krb5_context context, krb5_preauthtype pa_type);

/*
 * Responder for krb5_kdcpreauth_edata_fn.  If invoked with a non-zero code, pa
 * will be ignored and the padata type will not be included in the hint list.
 * If invoked with a zero code and a null pa value, the padata type will be
 * included in the list with an empty value.  If invoked with a zero code and a
 * non-null pa value, pa will be included in the hint list and will later be
 * freed by the KDC.
 */
typedef void
(*krb5_kdcpreauth_edata_respond_fn)(void *arg, krb5_error_code code,
                                    krb5_pa_data *pa);

/*
 * Optional: provide pa_data to send to the client as part of the "you need to
 * use preauthentication" error.  The implementation must invoke the respond
 * when complete, whether successful or not, either before returning or
 * asynchronously using the verto context returned by cb->event_context().
 *
 * This function is not allowed to create a modreq object because we have no
 * guarantee that the client will ever make a follow-up request, or that it
 * will hit this KDC if it does.
 */
typedef void
(*krb5_kdcpreauth_edata_fn)(krb5_context context, krb5_kdc_req *request,
                            krb5_kdcpreauth_callbacks cb,
                            krb5_kdcpreauth_rock rock,
                            krb5_kdcpreauth_moddata moddata,
                            krb5_preauthtype pa_type,
                            krb5_kdcpreauth_edata_respond_fn respond,
                            void *arg);

/*
 * Responder for krb5_kdcpreauth_verify_fn.  Invoke with the arg parameter
 * supplied to verify, the error code (0 for success), an optional module
 * request state object to be consumed by return_fn or free_modreq_fn, optional
 * e_data to be passed to the caller if code is nonzero, and optional
 * authorization data to be included in the ticket.  In non-FAST replies,
 * e_data will be encoded as typed-data if the module sets the PA_TYPED_E_DATA
 * flag, and as pa-data otherwise.  e_data and authz_data will be freed by the
 * KDC.
 */
typedef void
(*krb5_kdcpreauth_verify_respond_fn)(void *arg, krb5_error_code code,
                                     krb5_kdcpreauth_modreq modreq,
                                     krb5_pa_data **e_data,
                                     krb5_authdata **authz_data);

/*
 * Optional: verify preauthentication data sent by the client, setting the
 * TKT_FLG_PRE_AUTH or TKT_FLG_HW_AUTH flag in the enc_tkt_reply's "flags"
 * field as appropriate.  The implementation must invoke the respond function
 * when complete, whether successful or not, either before returning or
 * asynchronously using the verto context returned by cb->event_context().
 */
typedef void
(*krb5_kdcpreauth_verify_fn)(krb5_context context,
                             krb5_data *req_pkt, krb5_kdc_req *request,
                             krb5_enc_tkt_part *enc_tkt_reply,
                             krb5_pa_data *data,
                             krb5_kdcpreauth_callbacks cb,
                             krb5_kdcpreauth_rock rock,
                             krb5_kdcpreauth_moddata moddata,
                             krb5_kdcpreauth_verify_respond_fn respond,
                             void *arg);

/*
 * Optional: generate preauthentication response data to send to the client as
 * part of the AS-REP.  If it needs to override the key which is used to
 * encrypt the response, it can do so.
 */
typedef krb5_error_code
(*krb5_kdcpreauth_return_fn)(krb5_context context,
                             krb5_pa_data *padata,
                             krb5_data *req_pkt,
                             krb5_kdc_req *request,
                             krb5_kdc_rep *reply,
                             krb5_keyblock *encrypting_key,
                             krb5_pa_data **send_pa_out,
                             krb5_kdcpreauth_callbacks cb,
                             krb5_kdcpreauth_rock rock,
                             krb5_kdcpreauth_moddata moddata,
                             krb5_kdcpreauth_modreq modreq);

/* Optional: free a per-request context. */
typedef void
(*krb5_kdcpreauth_free_modreq_fn)(krb5_context,
                                  krb5_kdcpreauth_moddata moddata,
                                  krb5_kdcpreauth_modreq modreq);

/* Optional: invoked after init_fn to provide the module with a pointer to the
 * verto main loop. */
typedef krb5_error_code
(*krb5_kdcpreauth_loop_fn)(krb5_context context,
                           krb5_kdcpreauth_moddata moddata,
                           struct verto_ctx *ctx);

typedef struct krb5_kdcpreauth_vtable_st {
    /* Mandatory: name of module. */
    char *name;

/* Mandatory: pointer to zero-terminated list of pa_types which this module
     * can provide services for. */
    krb5_preauthtype *pa_type_list;

krb5_kdcpreauth_init_fn init;
    krb5_kdcpreauth_fini_fn fini;
    krb5_kdcpreauth_flags_fn flags;
    krb5_kdcpreauth_edata_fn edata;
    krb5_kdcpreauth_verify_fn verify;
    krb5_kdcpreauth_return_fn return_padata;
    krb5_kdcpreauth_free_modreq_fn free_modreq;
    /* Minor 1 ends here. */

krb5_kdcpreauth_loop_fn loop;
    /* Minor 2 ends here. */
} *krb5_kdcpreauth_vtable;

#endif /* KRB5_KDCPREAUTH_PLUGIN_H */

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