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/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
* Copyright 2013 Red Hat, Inc. 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 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.
*/
/*
* This API is not considered as stable as the main krb5 API.
*
* - We may make arbitrary incompatible changes between feature releases
* (e.g. from 1.12 to 1.13).
* - We will make some effort to avoid making incompatible changes for
* bugfix releases, but will make them if necessary.
*/
#ifndef KRAD_H_
#define KRAD_H_
#include <krb5.h>
#include <verto.h>
#include <stddef.h>
#include <stdio.h>
#define KRAD_PACKET_SIZE_MAX 4096
#define KRAD_SERVICE_TYPE_LOGIN 1
#define KRAD_SERVICE_TYPE_FRAMED 2
#define KRAD_SERVICE_TYPE_CALLBACK_LOGIN 3
#define KRAD_SERVICE_TYPE_CALLBACK_FRAMED 4
#define KRAD_SERVICE_TYPE_OUTBOUND 5
#define KRAD_SERVICE_TYPE_ADMINISTRATIVE 6
#define KRAD_SERVICE_TYPE_NAS_PROMPT 7
#define KRAD_SERVICE_TYPE_AUTHENTICATE_ONLY 8
#define KRAD_SERVICE_TYPE_CALLBACK_NAS_PROMPT 9
#define KRAD_SERVICE_TYPE_CALL_CHECK 10
#define KRAD_SERVICE_TYPE_CALLBACK_ADMINISTRATIVE 11
typedef struct krad_attrset_st krad_attrset;
typedef struct krad_packet_st krad_packet;
typedef struct krad_client_st krad_client;
typedef unsigned char krad_code;
typedef unsigned char krad_attr;
/* Called when a response is received or the request times out. */
typedef void
(*krad_cb)(krb5_error_code retval, const krad_packet *request,
const krad_packet *response, void *data);
/*
* Called to iterate over a set of requests. Either the callback will be
* called until it returns NULL, or it will be called with cancel = TRUE to
* terminate in the middle of an iteration.
*/
typedef const krad_packet *
(*krad_packet_iter_cb)(void *data, krb5_boolean cancel);
/*
* Code
*/
/* Convert a code name to its number. Only works for codes defined
* by RFC 2875 or 2882. Returns 0 if the name was not found. */
krad_code
krad_code_name2num(const char *name);
/* Convert a code number to its name. Only works for attributes defined
* by RFC 2865 or 2882. Returns NULL if the name was not found. */
const char *
krad_code_num2name(krad_code code);
/*
* Attribute
*/
/* Convert an attribute name to its number. Only works for attributes defined
* by RFC 2865. Returns 0 if the name was not found. */
krad_attr
krad_attr_name2num(const char *name);
/* Convert an attribute number to its name. Only works for attributes defined
* by RFC 2865. Returns NULL if the name was not found. */
const char *
krad_attr_num2name(krad_attr type);
/*
* Attribute set
*/
/* Create a new attribute set. */
krb5_error_code
krad_attrset_new(krb5_context ctx, krad_attrset **set);
/* Create a deep copy of an attribute set. */
krb5_error_code
krad_attrset_copy(const krad_attrset *set, krad_attrset **copy);
/* Free an attribute set. */
void
krad_attrset_free(krad_attrset *set);
/* Add an attribute to a set. */
krb5_error_code
krad_attrset_add(krad_attrset *set, krad_attr type, const krb5_data *data);
/* Add a four-octet unsigned number attribute to the given set. */
krb5_error_code
krad_attrset_add_number(krad_attrset *set, krad_attr type, krb5_ui_4 num);
/* Delete the specified attribute. */
void
krad_attrset_del(krad_attrset *set, krad_attr type, size_t indx);
/* Get the specified attribute. */
const krb5_data *
krad_attrset_get(const krad_attrset *set, krad_attr type, size_t indx);
/*
* Packet
*/
/* Determine the bytes needed from the socket to get the whole packet. Don't
* cache the return value as it can change! Returns -1 on EBADMSG. */
ssize_t
krad_packet_bytes_needed(const krb5_data *buffer);
/* Free a packet. */
void
krad_packet_free(krad_packet *pkt);
/*
* Create a new request packet.
*
* This function takes the attributes specified in set and converts them into a
* radius packet. The packet will have a randomized id. If cb is not NULL, it
* will be called passing data as the argument to iterate over a set of
* outstanding requests. In this case, the id will be both random and unique
* across the set of requests.
*/
krb5_error_code
krad_packet_new_request(krb5_context ctx, const char *secret, krad_code code,
const krad_attrset *set, krad_packet_iter_cb cb,
void *data, krad_packet **request);
/*
* Create a new response packet.
*
* This function is similar to krad_packet_new_requst() except that it crafts a
* packet in response to a request packet. This new packet will borrow values
* from the request such as the id and the authenticator.
*/
krb5_error_code
krad_packet_new_response(krb5_context ctx, const char *secret, krad_code code,
const krad_attrset *set, const krad_packet *request,
krad_packet **response);
/*
* Decode a request radius packet from krb5_data.
*
* The resulting decoded packet will be a request packet stored in *reqpkt.
*
* If cb is NULL, *duppkt will always be NULL.
*
* If cb is not NULL, it will be called (with the data argument) to iterate
* over a set of requests currently being processed. In this case, if the
* packet is a duplicate of an already received request, the original request
* will be set in *duppkt.
*/
krb5_error_code
krad_packet_decode_request(krb5_context ctx, const char *secret,
const krb5_data *buffer, krad_packet_iter_cb cb,
void *data, const krad_packet **duppkt,
krad_packet **reqpkt);
/*
* Decode a response radius packet from krb5_data.
*
* The resulting decoded packet will be a response packet stored in *rsppkt.
*
* If cb is NULL, *reqpkt will always be NULL.
*
* If cb is not NULL, it will be called (with the data argument) to iterate
* over a set of requests awaiting responses. In this case, if the response
* packet matches one of these requests, the original request will be set in
* *reqpkt.
*/
krb5_error_code
krad_packet_decode_response(krb5_context ctx, const char *secret,
const krb5_data *buffer, krad_packet_iter_cb cb,
void *data, const krad_packet **reqpkt,
krad_packet **rsppkt);
/* Encode packet. */
const krb5_data *
krad_packet_encode(const krad_packet *pkt);
/* Get the code for the given packet. */
krad_code
krad_packet_get_code(const krad_packet *pkt);
/* Get the specified attribute. */
const krb5_data *
krad_packet_get_attr(const krad_packet *pkt, krad_attr type, size_t indx);
/*
* Client
*/
/* Create a new client. */
krb5_error_code
krad_client_new(krb5_context kctx, verto_ctx *vctx, krad_client **client);
/* Free the client. */
void
krad_client_free(krad_client *client);
/*
* Send a request to a radius server.
*
* The remote host may be specified by one of the following formats:
* - /path/to/unix.socket
* - IPv4
* - IPv4:port
* - IPv4:service
* - [IPv6]
* - [IPv6]:port
* - [IPv6]:service
* - hostname
* - hostname:port
* - hostname:service
*
* The timeout parameter (milliseconds) is the total timeout across all remote
* hosts (when DNS returns multiple entries) and all retries. For stream
* sockets, the retries parameter is ignored and no retries are performed.
*
* The cb function will be called with the data argument when either a response
* is received or the request times out on all possible remote hosts.
*/
krb5_error_code
krad_client_send(krad_client *rc, krad_code code, const krad_attrset *attrs,
const char *remote, const char *secret, int timeout,
size_t retries, krad_cb cb, void *data);
#endif /* KRAD_H_ */