511 lines
12 KiB
C
511 lines
12 KiB
C
/*
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* Copyright (C) 2007 Tobias Brunner
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* Copyright (C) 2005-2006 Martin Willi
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* Copyright (C) 2005 Jan Hutter
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* HSR 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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/* offsetof macro */
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#include <stddef.h>
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#include "ike_header.h"
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#include <encoding/payloads/encodings.h>
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typedef struct private_ike_header_t private_ike_header_t;
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/**
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* Private data of an ike_header_t object.
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*/
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struct private_ike_header_t {
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/**
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* Public interface.
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*/
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ike_header_t public;
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/**
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* SPI of the initiator.
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*/
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uint64_t initiator_spi;
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/**
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* SPI of the responder.
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*/
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uint64_t responder_spi;
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/**
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* Next payload type.
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*/
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uint8_t next_payload;
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/**
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* IKE major version.
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*/
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uint8_t maj_version;
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/**
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* IKE minor version.
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*/
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uint8_t min_version;
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/**
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* Exchange type .
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*/
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uint8_t exchange_type;
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/**
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* Flags of the Message.
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*/
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struct {
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/**
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* Sender is initiator of the associated IKE_SA_INIT-Exchange.
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*/
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bool initiator;
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/**
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* Is protocol supporting higher version?
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*/
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bool version;
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/**
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* TRUE, if this is a response, FALSE if its a Request.
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*/
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bool response;
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/**
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* TRUE, if the packet is encrypted (IKEv1).
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*/
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bool encryption;
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/**
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* TRUE, if the commit flag is set (IKEv1).
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*/
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bool commit;
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/**
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* TRUE, if the auth only flag is set (IKEv1).
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*/
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bool authonly;
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} flags;
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/**
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* Reserved bits of IKE header
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*/
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bool reserved[2];
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/**
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* Associated Message-ID.
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*/
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uint32_t message_id;
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/**
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* Length of the whole IKEv2-Message (header and all payloads).
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*/
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uint32_t length;
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};
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ENUM_BEGIN(exchange_type_names, ID_PROT, TRANSACTION,
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"ID_PROT",
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"AUTH_ONLY",
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"AGGRESSIVE",
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"INFORMATIONAL_V1",
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"TRANSACTION");
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ENUM_NEXT(exchange_type_names, QUICK_MODE, IKE_SESSION_RESUME, TRANSACTION,
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"QUICK_MODE",
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"NEW_GROUP_MODE",
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"IKE_SA_INIT",
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"IKE_AUTH",
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"CREATE_CHILD_SA",
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"INFORMATIONAL",
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"IKE_SESSION_RESUME");
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#ifdef ME
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ENUM_NEXT(exchange_type_names, ME_CONNECT, ME_CONNECT, IKE_SESSION_RESUME,
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"ME_CONNECT");
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ENUM_NEXT(exchange_type_names, EXCHANGE_TYPE_UNDEFINED,
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EXCHANGE_TYPE_UNDEFINED, ME_CONNECT,
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"EXCHANGE_TYPE_UNDEFINED");
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#else
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ENUM_NEXT(exchange_type_names, EXCHANGE_TYPE_UNDEFINED,
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EXCHANGE_TYPE_UNDEFINED, IKE_SESSION_RESUME,
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"EXCHANGE_TYPE_UNDEFINED");
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#endif /* ME */
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ENUM_END(exchange_type_names, EXCHANGE_TYPE_UNDEFINED);
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/**
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* Encoding rules to parse or generate a IKE-Header.
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*
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* The defined offsets are the positions in a object of type
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* ike_header_t.
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*/
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static encoding_rule_t encodings[] = {
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/* 8 Byte SPI, stored in the field initiator_spi */
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{ IKE_SPI, offsetof(private_ike_header_t, initiator_spi) },
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/* 8 Byte SPI, stored in the field responder_spi */
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{ IKE_SPI, offsetof(private_ike_header_t, responder_spi) },
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/* 1 Byte next payload type, stored in the field next_payload */
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{ U_INT_8, offsetof(private_ike_header_t, next_payload) },
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/* 4 Bit major version, stored in the field maj_version */
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{ U_INT_4, offsetof(private_ike_header_t, maj_version) },
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/* 4 Bit minor version, stored in the field min_version */
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{ U_INT_4, offsetof(private_ike_header_t, min_version) },
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/* 8 Bit for the exchange type */
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{ U_INT_8, offsetof(private_ike_header_t, exchange_type) },
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/* 2 Bit reserved bits */
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{ RESERVED_BIT, offsetof(private_ike_header_t, reserved[0]) },
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{ RESERVED_BIT, offsetof(private_ike_header_t, reserved[1]) },
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/* 6 flags */
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{ FLAG, offsetof(private_ike_header_t, flags.response) },
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{ FLAG, offsetof(private_ike_header_t, flags.version) },
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{ FLAG, offsetof(private_ike_header_t, flags.initiator) },
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{ FLAG, offsetof(private_ike_header_t, flags.authonly) },
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{ FLAG, offsetof(private_ike_header_t, flags.commit) },
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{ FLAG, offsetof(private_ike_header_t, flags.encryption)},
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/* 4 Byte message id, stored in the field message_id */
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{ U_INT_32, offsetof(private_ike_header_t, message_id) },
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/* 4 Byte length field, stored in the field length */
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{ HEADER_LENGTH, offsetof(private_ike_header_t, length) }
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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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! IKE_SA Initiator's SPI !
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! !
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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! IKE_SA Responder's SPI !
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! !
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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! Next Payload ! MjVer ! MnVer ! Exchange Type ! Flags !
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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! Message ID !
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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! Length !
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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METHOD(payload_t, verify, status_t,
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private_ike_header_t *this)
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{
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switch (this->exchange_type)
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{
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case ID_PROT:
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case AGGRESSIVE:
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if (this->message_id != 0)
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{
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return FAILED;
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}
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/* fall */
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case AUTH_ONLY:
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case INFORMATIONAL_V1:
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case TRANSACTION:
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case QUICK_MODE:
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case NEW_GROUP_MODE:
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if (this->maj_version == IKEV2_MAJOR_VERSION)
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{
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/* IKEv1 exchange type in IKEv2? */
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return FAILED;
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}
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break;
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case IKE_SA_INIT:
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case IKE_AUTH:
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case CREATE_CHILD_SA:
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case INFORMATIONAL:
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case IKE_SESSION_RESUME:
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#ifdef ME
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case ME_CONNECT:
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#endif /* ME */
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if (this->maj_version == IKEV1_MAJOR_VERSION)
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{
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/* IKEv2 exchange type in IKEv1? */
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return FAILED;
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}
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break;
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default:
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if (this->maj_version == IKEV1_MAJOR_VERSION ||
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this->maj_version == IKEV2_MAJOR_VERSION)
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{
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/* unsupported exchange type for known version */
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return FAILED;
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}
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break;
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}
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if (this->initiator_spi == 0)
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{
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#ifdef ME
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if (this->exchange_type != INFORMATIONAL)
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/* we allow zero spi for INFORMATIONAL exchanges,
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* to allow connectivity checks */
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#endif /* ME */
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{
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return FAILED;
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}
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}
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return SUCCESS;
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}
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METHOD(payload_t, get_encoding_rules, int,
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private_ike_header_t *this, encoding_rule_t **rules)
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{
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*rules = encodings;
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return countof(encodings);
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}
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METHOD(payload_t, get_header_length, int,
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private_ike_header_t *this)
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{
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return IKE_HEADER_LENGTH;
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}
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METHOD(payload_t, get_type, payload_type_t,
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private_ike_header_t *this)
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{
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return PL_HEADER;
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}
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METHOD(payload_t, get_next_type, payload_type_t,
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private_ike_header_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_ike_header_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_ike_header_t *this)
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{
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return this->length;
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}
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METHOD(ike_header_t, get_initiator_spi, uint64_t,
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private_ike_header_t *this)
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{
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return this->initiator_spi;
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}
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METHOD(ike_header_t, set_initiator_spi, void,
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private_ike_header_t *this, uint64_t initiator_spi)
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{
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this->initiator_spi = initiator_spi;
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}
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METHOD(ike_header_t, get_responder_spi, uint64_t,
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private_ike_header_t *this)
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{
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return this->responder_spi;
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}
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METHOD(ike_header_t, set_responder_spi, void,
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private_ike_header_t *this, uint64_t responder_spi)
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{
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this->responder_spi = responder_spi;
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}
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METHOD(ike_header_t, get_maj_version, uint8_t,
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private_ike_header_t *this)
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{
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return this->maj_version;
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}
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METHOD(ike_header_t, set_maj_version, void,
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private_ike_header_t *this, uint8_t major)
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{
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this->maj_version = major;
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}
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METHOD(ike_header_t, get_min_version, uint8_t,
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private_ike_header_t *this)
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{
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return this->min_version;
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}
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METHOD(ike_header_t, set_min_version, void,
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private_ike_header_t *this, uint8_t minor)
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{
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this->min_version = minor;
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}
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METHOD(ike_header_t, get_response_flag, bool,
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private_ike_header_t *this)
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{
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return this->flags.response;
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}
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METHOD(ike_header_t, set_response_flag, void,
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private_ike_header_t *this, bool response)
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{
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this->flags.response = response;
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}
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METHOD(ike_header_t, get_version_flag, bool,
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private_ike_header_t *this)
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{
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return this->flags.version;
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}
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METHOD(ike_header_t, set_version_flag, void,
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private_ike_header_t *this, bool version)
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{
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this->flags.version = version;
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}
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METHOD(ike_header_t, get_initiator_flag, bool,
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private_ike_header_t *this)
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{
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return this->flags.initiator;
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}
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METHOD(ike_header_t, set_initiator_flag, void,
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private_ike_header_t *this, bool initiator)
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{
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this->flags.initiator = initiator;
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}
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METHOD(ike_header_t, get_encryption_flag, bool,
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private_ike_header_t *this)
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{
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return this->flags.encryption;
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}
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METHOD(ike_header_t, set_encryption_flag, void,
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private_ike_header_t *this, bool encryption)
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{
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this->flags.encryption = encryption;
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}
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METHOD(ike_header_t, get_commit_flag, bool,
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private_ike_header_t *this)
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{
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return this->flags.commit;
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}
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METHOD(ike_header_t, set_commit_flag, void,
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private_ike_header_t *this, bool commit)
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{
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this->flags.commit = commit;
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}
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METHOD(ike_header_t, get_authonly_flag, bool,
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private_ike_header_t *this)
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{
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return this->flags.authonly;
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}
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METHOD(ike_header_t, set_authonly_flag, void,
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private_ike_header_t *this, bool authonly)
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{
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this->flags.authonly = authonly;
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}
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METHOD(ike_header_t, get_exchange_type, uint8_t,
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private_ike_header_t *this)
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{
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return this->exchange_type;
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}
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METHOD(ike_header_t, set_exchange_type, void,
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private_ike_header_t *this, uint8_t exchange_type)
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{
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this->exchange_type = exchange_type;
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}
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METHOD(ike_header_t, get_message_id, uint32_t,
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private_ike_header_t *this)
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{
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return this->message_id;
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}
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METHOD(ike_header_t, set_message_id, void,
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private_ike_header_t *this, uint32_t message_id)
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{
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this->message_id = message_id;
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}
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METHOD2(payload_t, ike_header_t, destroy, void,
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private_ike_header_t *this)
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{
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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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ike_header_t *ike_header_create()
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{
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private_ike_header_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_header_length = _get_header_length,
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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_type,
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.destroy = _destroy,
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},
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.get_initiator_spi = _get_initiator_spi,
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.set_initiator_spi = _set_initiator_spi,
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.get_responder_spi = _get_responder_spi,
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.set_responder_spi = _set_responder_spi,
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.get_maj_version = _get_maj_version,
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.set_maj_version = _set_maj_version,
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.get_min_version = _get_min_version,
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.set_min_version = _set_min_version,
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.get_response_flag = _get_response_flag,
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.set_response_flag = _set_response_flag,
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.get_version_flag = _get_version_flag,
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.set_version_flag = _set_version_flag,
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.get_initiator_flag = _get_initiator_flag,
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.set_initiator_flag = _set_initiator_flag,
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.get_encryption_flag = _get_encryption_flag,
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.set_encryption_flag = _set_encryption_flag,
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.get_commit_flag = _get_commit_flag,
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.set_commit_flag = _set_commit_flag,
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.get_authonly_flag = _get_authonly_flag,
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.set_authonly_flag = _set_authonly_flag,
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.get_exchange_type = _get_exchange_type,
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.set_exchange_type = _set_exchange_type,
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.get_message_id = _get_message_id,
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.set_message_id = _set_message_id,
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.destroy = _destroy,
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},
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.length = IKE_HEADER_LENGTH,
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.exchange_type = EXCHANGE_TYPE_UNDEFINED,
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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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ike_header_t *ike_header_create_version(int major, int minor)
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{
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ike_header_t *this = ike_header_create();
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this->set_maj_version(this, major);
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this->set_min_version(this, minor);
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if (major == IKEV2_MAJOR_VERSION)
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{
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this->set_initiator_flag(this, TRUE);
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}
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return this;
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}
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