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/*
* Copyright (C) 2015 Tobias Brunner
* Copyright (C) 2005-2010 Martin Willi
* Copyright (C) 2010 revosec AG
* Copyright (C) 2005 Jan Hutter
* Hochschule fuer Technik Rapperswil
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
#include <stddef.h>
#include "delete_payload.h"
typedef struct private_delete_payload_t private_delete_payload_t;
/**
* Private data of an delete_payload_t object.
*/
struct private_delete_payload_t {
/**
* Public delete_payload_t interface.
*/
delete_payload_t public;
/**
* Next payload type.
*/
u_int8_t next_payload;
/**
* Critical flag.
*/
bool critical;
/**
* reserved bits
*/
bool reserved[8];
/**
* Length of this payload.
*/
u_int16_t payload_length;
/**
* IKEv1 Domain of Interpretation
*/
u_int32_t doi;
/**
* Protocol ID.
*/
u_int8_t protocol_id;
/**
* SPI Size.
*/
u_int8_t spi_size;
/**
* Number of SPI's.
*/
u_int16_t spi_count;
/**
* The contained SPI's.
*/
chunk_t spis;
/**
* Payload type, PLV2_DELETE or PLV1_DELETE
*/
payload_type_t type;
};
/**
* Encoding rules for an IKEv2 delete payload.
*/
static encoding_rule_t encodings_v2[] = {
/* 1 Byte next payload type, stored in the field next_payload */
{ U_INT_8, offsetof(private_delete_payload_t, next_payload) },
/* the critical bit */
{ FLAG, offsetof(private_delete_payload_t, critical) },
/* 7 Bit reserved bits */
{ RESERVED_BIT, offsetof(private_delete_payload_t, reserved[0]) },
{ RESERVED_BIT, offsetof(private_delete_payload_t, reserved[1]) },
{ RESERVED_BIT, offsetof(private_delete_payload_t, reserved[2]) },
{ RESERVED_BIT, offsetof(private_delete_payload_t, reserved[3]) },
{ RESERVED_BIT, offsetof(private_delete_payload_t, reserved[4]) },
{ RESERVED_BIT, offsetof(private_delete_payload_t, reserved[5]) },
{ RESERVED_BIT, offsetof(private_delete_payload_t, reserved[6]) },
/* Length of the whole payload*/
{ PAYLOAD_LENGTH, offsetof(private_delete_payload_t, payload_length) },
{ U_INT_8, offsetof(private_delete_payload_t, protocol_id) },
{ U_INT_8, offsetof(private_delete_payload_t, spi_size) },
{ U_INT_16, offsetof(private_delete_payload_t, spi_count) },
/* some delete data bytes, length is defined in PAYLOAD_LENGTH */
{ CHUNK_DATA, offsetof(private_delete_payload_t, spis) },
};
/*
1 2 3
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
! Next Payload !C! RESERVED ! Payload Length !
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
! Protocol ID ! SPI Size ! # of SPIs !
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
! !
~ Security Parameter Index(es) (SPI) ~
! !
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
/**
* Encoding rules for an IKEv1 delete payload.
*/
static encoding_rule_t encodings_v1[] = {
/* 1 Byte next payload type, stored in the field next_payload */
{ U_INT_8, offsetof(private_delete_payload_t, next_payload) },
/* 8 Bit reserved bits */
{ RESERVED_BIT, offsetof(private_delete_payload_t, reserved[0]) },
{ RESERVED_BIT, offsetof(private_delete_payload_t, reserved[1]) },
{ RESERVED_BIT, offsetof(private_delete_payload_t, reserved[2]) },
{ RESERVED_BIT, offsetof(private_delete_payload_t, reserved[3]) },
{ RESERVED_BIT, offsetof(private_delete_payload_t, reserved[4]) },
{ RESERVED_BIT, offsetof(private_delete_payload_t, reserved[5]) },
{ RESERVED_BIT, offsetof(private_delete_payload_t, reserved[6]) },
{ RESERVED_BIT, offsetof(private_delete_payload_t, reserved[7]) },
/* Length of the whole payload*/
{ PAYLOAD_LENGTH, offsetof(private_delete_payload_t, payload_length) },
/* Domain of interpretation */
{ U_INT_32, offsetof(private_delete_payload_t, doi) },
{ U_INT_8, offsetof(private_delete_payload_t, protocol_id) },
{ U_INT_8, offsetof(private_delete_payload_t, spi_size) },
{ U_INT_16, offsetof(private_delete_payload_t, spi_count) },
/* some delete data bytes, length is defined in PAYLOAD_LENGTH */
{ CHUNK_DATA, offsetof(private_delete_payload_t, spis) },
};
/*
1 2 3
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
! Next Payload !C! RESERVED ! Payload Length !
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
! DOI !
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
! Protocol ID ! SPI Size ! # of SPIs !
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
! !
~ Security Parameter Index(es) (SPI) ~
! !
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
METHOD(payload_t, verify, status_t,
private_delete_payload_t *this)
{
switch (this->protocol_id)
{
case PROTO_AH:
case PROTO_ESP:
if (this->spi_size != 4)
{
return FAILED;
}
break;
case PROTO_IKE:
case 0:
if (this->type == PLV2_DELETE)
{ /* IKEv2 deletion has no spi assigned! */
if (this->spi_size != 0)
{
return FAILED;
}
}
else
{ /* IKEv1 uses the two concatenated ISAKMP cookies as SPI */
if (this->spi_size != 16)
{
return FAILED;
}
}
break;
default:
return FAILED;
}
if (this->spis.len != (this->spi_count * this->spi_size))
{
return FAILED;
}
return SUCCESS;
}
METHOD(payload_t, get_encoding_rules, int,
private_delete_payload_t *this, encoding_rule_t **rules)
{
if (this->type == PLV2_DELETE)
{
*rules = encodings_v2;
return countof(encodings_v2);
}
*rules = encodings_v1;
return countof(encodings_v1);
}
METHOD(payload_t, get_header_length, int,
private_delete_payload_t *this)
{
if (this->type == PLV2_DELETE)
{
return 8;
}
return 12;
}
METHOD(payload_t, get_payload_type, payload_type_t,
private_delete_payload_t *this)
{
return this->type;
}
METHOD(payload_t, get_next_type, payload_type_t,
private_delete_payload_t *this)
{
return this->next_payload;
}
METHOD(payload_t, set_next_type, void,
private_delete_payload_t *this,payload_type_t type)
{
this->next_payload = type;
}
METHOD(payload_t, get_length, size_t,
private_delete_payload_t *this)
{
return this->payload_length;
}
METHOD(delete_payload_t, get_protocol_id, protocol_id_t,
private_delete_payload_t *this)
{
return this->protocol_id;
}
METHOD(delete_payload_t, add_spi, void,
private_delete_payload_t *this, u_int32_t spi)
{
switch (this->protocol_id)
{
case PROTO_AH:
case PROTO_ESP:
this->spi_count++;
this->payload_length += sizeof(spi);
this->spis = chunk_cat("mc", this->spis, chunk_from_thing(spi));
break;
default:
break;
}
}
METHOD(delete_payload_t, set_ike_spi, void,
private_delete_payload_t *this, u_int64_t spi_i, u_int64_t spi_r)
{
free(this->spis.ptr);
this->spis = chunk_cat("cc", chunk_from_thing(spi_i),
chunk_from_thing(spi_r));
this->spi_count = 1;
this->payload_length = get_header_length(this) + this->spi_size;
}
METHOD(delete_payload_t, get_ike_spi, bool,
private_delete_payload_t *this, u_int64_t *spi_i, u_int64_t *spi_r)
{
if (this->protocol_id != PROTO_IKE ||
this->spis.len < 2 * sizeof(u_int64_t))
{
return FALSE;
}
memcpy(spi_i, this->spis.ptr, sizeof(u_int64_t));
memcpy(spi_r, this->spis.ptr + sizeof(u_int64_t), sizeof(u_int64_t));
return TRUE;
}
/**
* SPI enumerator implementation
*/
typedef struct {
/** implements enumerator_t */
enumerator_t public;
/** remaining SPIs */
chunk_t spis;
} spi_enumerator_t;
METHOD(enumerator_t, spis_enumerate, bool,
spi_enumerator_t *this, u_int32_t *spi)
{
if (this->spis.len >= sizeof(*spi))
{
memcpy(spi, this->spis.ptr, sizeof(*spi));
this->spis = chunk_skip(this->spis, sizeof(*spi));
return TRUE;
}
return FALSE;
}
METHOD(delete_payload_t, create_spi_enumerator, enumerator_t*,
private_delete_payload_t *this)
{
spi_enumerator_t *e;
if (this->spi_size != sizeof(u_int32_t))
{
return enumerator_create_empty();
}
INIT(e,
.public = {
.enumerate = (void*)_spis_enumerate,
.destroy = (void*)free,
},
.spis = this->spis,
);
return &e->public;
}
METHOD2(payload_t, delete_payload_t, destroy, void,
private_delete_payload_t *this)
{
free(this->spis.ptr);
free(this);
}
/*
* Described in header
*/
delete_payload_t *delete_payload_create(payload_type_t type,
protocol_id_t protocol_id)
{
private_delete_payload_t *this;
INIT(this,
.public = {
.payload_interface = {
.verify = _verify,
.get_encoding_rules = _get_encoding_rules,
.get_header_length = _get_header_length,
.get_length = _get_length,
.get_next_type = _get_next_type,
.set_next_type = _set_next_type,
.get_type = _get_payload_type,
.destroy = _destroy,
},
.get_protocol_id = _get_protocol_id,
.add_spi = _add_spi,
.set_ike_spi = _set_ike_spi,
.get_ike_spi = _get_ike_spi,
.create_spi_enumerator = _create_spi_enumerator,
.destroy = _destroy,
},
.next_payload = PL_NONE,
.protocol_id = protocol_id,
.doi = IKEV1_DOI_IPSEC,
.type = type,
);
this->payload_length = get_header_length(this);
if (protocol_id == PROTO_IKE)
{
if (type == PLV1_DELETE)
{
this->spi_size = 16;
}
}
else
{
this->spi_size = 4;
}
return &this->public;
}
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