Moving charon to libcharon.
This commit is contained in:
Tobias Brunner
@@ -0,0 +1,302 @@
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/*
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* Copyright (C) 2005-2010 Martin Willi
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* Copyright (C) 2005 Jan Hutter
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* Hochschule fuer Technik Rapperswil
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#include <stddef.h>
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#include "eap_payload.h"
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#include <daemon.h>
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typedef struct private_eap_payload_t private_eap_payload_t;
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/**
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* Private data of an eap_payload_t object.
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*
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*/
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struct private_eap_payload_t {
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/**
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* Public eap_payload_t interface.
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*/
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eap_payload_t public;
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/**
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* Next payload type.
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*/
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u_int8_t next_payload;
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/**
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* Critical flag.
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*/
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bool critical;
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/**
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* Length of this payload.
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*/
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u_int16_t payload_length;
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/**
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* EAP message data, if available
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*/
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chunk_t data;
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};
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/**
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* Encoding rules to parse or generate a EAP payload.
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*
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* The defined offsets are the positions in a object of type
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* private_eap_payload_t.
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*
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*/
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static encoding_rule_t eap_payload_encodings[] = {
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/* 1 Byte next payload type, stored in the field next_payload */
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{ U_INT_8, offsetof(private_eap_payload_t, next_payload) },
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/* the critical bit */
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{ FLAG, offsetof(private_eap_payload_t, critical) },
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/* 7 Bit reserved bits, nowhere stored */
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{ RESERVED_BIT, 0 },
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{ RESERVED_BIT, 0 },
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{ RESERVED_BIT, 0 },
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{ RESERVED_BIT, 0 },
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{ RESERVED_BIT, 0 },
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{ RESERVED_BIT, 0 },
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{ RESERVED_BIT, 0 },
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/* Length of the whole payload*/
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{ PAYLOAD_LENGTH, offsetof(private_eap_payload_t, payload_length) },
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/* chunt to data, starting at "code" */
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{ EAP_DATA, offsetof(private_eap_payload_t, data) },
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};
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/*
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1 2 3
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0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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! Next Payload !C! RESERVED ! Payload Length !
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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! Code ! Identifier ! Length !
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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! Type ! Type_Data...
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
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*/
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METHOD(payload_t, verify, status_t,
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private_eap_payload_t *this)
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{
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u_int16_t length;
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u_int8_t code;
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if (this->data.len < 4)
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{
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DBG1(DBG_ENC, "EAP payloads EAP message too short (%d)", this->data.len);
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return FAILED;
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}
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length = untoh16(this->data.ptr + 2);
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if (this->data.len != length)
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{
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DBG1(DBG_ENC, "EAP payload length (%d) does not match contained "
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"message length (%d)", this->data.len, length);
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return FAILED;
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}
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code = this->data.ptr[0];
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switch (code)
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{
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case EAP_REQUEST:
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case EAP_RESPONSE:
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{
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if (this->data.len < 4)
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{
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DBG1(DBG_ENC, "EAP Request/Response does not have any data");
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return FAILED;
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}
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break;
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}
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case EAP_SUCCESS:
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case EAP_FAILURE:
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{
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if (this->data.len != 4)
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{
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DBG1(DBG_ENC, "EAP Success/Failure has data");
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return FAILED;
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}
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break;
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}
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default:
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return FAILED;
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}
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return SUCCESS;
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}
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METHOD(payload_t, get_encoding_rules, void,
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private_eap_payload_t *this, encoding_rule_t **rules, size_t *rule_count)
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{
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*rules = eap_payload_encodings;
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*rule_count = sizeof(eap_payload_encodings) / sizeof(encoding_rule_t);
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}
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METHOD(payload_t, get_payload_type, payload_type_t,
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private_eap_payload_t *this)
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{
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return EXTENSIBLE_AUTHENTICATION;
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}
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METHOD(payload_t, get_next_type, payload_type_t,
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private_eap_payload_t *this)
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{
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return (this->next_payload);
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}
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METHOD(payload_t, set_next_type, void,
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private_eap_payload_t *this, payload_type_t type)
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{
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this->next_payload = type;
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}
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METHOD(payload_t, get_length, size_t,
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private_eap_payload_t *this)
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{
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return this->payload_length;
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}
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METHOD(eap_payload_t, get_data, chunk_t,
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private_eap_payload_t *this)
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{
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return this->data;
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}
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METHOD(eap_payload_t, set_data, void,
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private_eap_payload_t *this, chunk_t data)
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{
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free(this->data.ptr);
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this->data = chunk_clone(data);
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this->payload_length = this->data.len + 4;
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}
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METHOD(eap_payload_t, get_code, eap_code_t,
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private_eap_payload_t *this)
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{
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if (this->data.len > 0)
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{
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return this->data.ptr[0];
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}
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/* should not happen, as it is verified */
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return 0;
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}
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METHOD(eap_payload_t, get_identifier, u_int8_t,
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private_eap_payload_t *this)
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{
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if (this->data.len > 1)
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{
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return this->data.ptr[1];
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}
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/* should not happen, as it is verified */
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return 0;
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}
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METHOD(eap_payload_t, get_type, eap_type_t,
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private_eap_payload_t *this, u_int32_t *vendor)
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{
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eap_type_t type;
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*vendor = 0;
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if (this->data.len > 4)
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{
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type = this->data.ptr[4];
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if (type != EAP_EXPANDED)
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{
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return type;
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}
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if (this->data.len >= 12)
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{
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*vendor = untoh32(this->data.ptr + 4) & 0x00FFFFFF;
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return untoh32(this->data.ptr + 8);
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}
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}
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return 0;
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}
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METHOD2(payload_t, eap_payload_t, destroy, void,
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private_eap_payload_t *this)
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{
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chunk_free(&this->data);
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free(this);
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}
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/*
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* Described in header
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*/
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eap_payload_t *eap_payload_create()
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{
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private_eap_payload_t *this;
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INIT(this,
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.public = {
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.payload_interface = {
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.verify = _verify,
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.get_encoding_rules = _get_encoding_rules,
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.get_length = _get_length,
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.get_next_type = _get_next_type,
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.set_next_type = _set_next_type,
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.get_type = _get_payload_type,
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.destroy = _destroy,
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},
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.get_data = _get_data,
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.set_data = _set_data,
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.get_code = _get_code,
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.get_identifier = _get_identifier,
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.get_type = _get_type,
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.destroy = _destroy,
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},
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.next_payload = NO_PAYLOAD,
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.payload_length = EAP_PAYLOAD_HEADER_LENGTH,
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);
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return &this->public;
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}
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/*
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* Described in header
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*/
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eap_payload_t *eap_payload_create_data(chunk_t data)
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{
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eap_payload_t *this = eap_payload_create();
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this->set_data(this, data);
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return this;
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}
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/*
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* Described in header
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*/
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eap_payload_t *eap_payload_create_code(eap_code_t code, u_int8_t identifier)
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{
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chunk_t data;
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data = chunk_from_chars(code, identifier, 0, 0);
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htoun16(data.ptr + 2, data.len);
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return eap_payload_create_data(data);
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}
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/*
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* Described in header
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*/
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eap_payload_t *eap_payload_create_nak(u_int8_t identifier)
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{
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chunk_t data;
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data = chunk_from_chars(EAP_RESPONSE, identifier, 0, 0, EAP_NAK);
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htoun16(data.ptr + 2, data.len);
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return eap_payload_create_data(data);
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}
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