599 lines
17 KiB
C
599 lines
17 KiB
C
/*
|
|
* Copyright (C) 2005-2006 Martin Willi
|
|
* 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 "proposal_substructure.h"
|
|
|
|
#include <encoding/payloads/encodings.h>
|
|
#include <encoding/payloads/transform_substructure.h>
|
|
#include <library.h>
|
|
#include <utils/linked_list.h>
|
|
#include <daemon.h>
|
|
|
|
|
|
/**
|
|
* IKEv1 Value for a proposal payload.
|
|
*/
|
|
#define PROPOSAL_TYPE_VALUE 2
|
|
|
|
|
|
typedef struct private_proposal_substructure_t private_proposal_substructure_t;
|
|
|
|
/**
|
|
* Private data of an proposal_substructure_t object.
|
|
*
|
|
*/
|
|
struct private_proposal_substructure_t {
|
|
/**
|
|
* Public proposal_substructure_t interface.
|
|
*/
|
|
proposal_substructure_t public;
|
|
|
|
/**
|
|
* Next payload type.
|
|
*/
|
|
u_int8_t next_payload;
|
|
|
|
/**
|
|
* Length of this payload.
|
|
*/
|
|
u_int16_t proposal_length;
|
|
|
|
/**
|
|
* Proposal number.
|
|
*/
|
|
u_int8_t proposal_number;
|
|
|
|
/**
|
|
* Protocol ID.
|
|
*/
|
|
u_int8_t protocol_id;
|
|
|
|
/**
|
|
* SPI size of the following SPI.
|
|
*/
|
|
u_int8_t spi_size;
|
|
|
|
/**
|
|
* Number of transforms.
|
|
*/
|
|
u_int8_t transforms_count;
|
|
|
|
/**
|
|
* SPI is stored as chunk.
|
|
*/
|
|
chunk_t spi;
|
|
|
|
/**
|
|
* Transforms are stored in a linked_list_t.
|
|
*/
|
|
linked_list_t * transforms;
|
|
};
|
|
|
|
/**
|
|
* Encoding rules to parse or generate a Proposal substructure.
|
|
*
|
|
* The defined offsets are the positions in a object of type
|
|
* private_proposal_substructure_t.
|
|
*/
|
|
encoding_rule_t proposal_substructure_encodings[] = {
|
|
/* 1 Byte next payload type, stored in the field next_payload */
|
|
{ U_INT_8, offsetof(private_proposal_substructure_t, next_payload) },
|
|
/* Reserved Byte is skipped */
|
|
{ RESERVED_BYTE, 0 },
|
|
/* Length of the whole proposal substructure payload*/
|
|
{ PAYLOAD_LENGTH, offsetof(private_proposal_substructure_t, proposal_length) },
|
|
/* proposal number is a number of 8 bit */
|
|
{ U_INT_8, offsetof(private_proposal_substructure_t, proposal_number) },
|
|
/* protocol ID is a number of 8 bit */
|
|
{ U_INT_8, offsetof(private_proposal_substructure_t, protocol_id) },
|
|
/* SPI Size has its own type */
|
|
{ SPI_SIZE, offsetof(private_proposal_substructure_t, spi_size) },
|
|
/* Number of transforms is a number of 8 bit */
|
|
{ U_INT_8, offsetof(private_proposal_substructure_t, transforms_count) },
|
|
/* SPI is a chunk of variable size*/
|
|
{ SPI, offsetof(private_proposal_substructure_t, spi) },
|
|
/* Transforms are stored in a transform substructure,
|
|
offset points to a linked_list_t pointer */
|
|
{ TRANSFORMS, offsetof(private_proposal_substructure_t, transforms) }
|
|
};
|
|
|
|
/*
|
|
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
|
|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
! 0 (last) or 2 ! RESERVED ! Proposal Length !
|
|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
! Proposal # ! Protocol ID ! SPI Size !# of Transforms!
|
|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
~ SPI (variable) ~
|
|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
! !
|
|
~ <Transforms> ~
|
|
! !
|
|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
*/
|
|
|
|
/**
|
|
* Implementation of payload_t.verify.
|
|
*/
|
|
static status_t verify(private_proposal_substructure_t *this)
|
|
{
|
|
status_t status = SUCCESS;
|
|
iterator_t *iterator;
|
|
payload_t *current_transform;
|
|
|
|
if ((this->next_payload != NO_PAYLOAD) && (this->next_payload != 2))
|
|
{
|
|
/* must be 0 or 2 */
|
|
DBG1(DBG_ENC, "inconsistent next payload");
|
|
return FAILED;
|
|
}
|
|
if (this->transforms_count != this->transforms->get_count(this->transforms))
|
|
{
|
|
/* must be the same! */
|
|
DBG1(DBG_ENC, "transform count invalid");
|
|
return FAILED;
|
|
}
|
|
|
|
switch (this->protocol_id)
|
|
{
|
|
case PROTO_AH:
|
|
case PROTO_ESP:
|
|
if (this->spi.len != 4)
|
|
{
|
|
DBG1(DBG_ENC, "invalid SPI length in %N proposal",
|
|
protocol_id_names, this->protocol_id);
|
|
return FAILED;
|
|
}
|
|
break;
|
|
case PROTO_IKE:
|
|
if (this->spi.len != 0 && this->spi.len != 8)
|
|
{
|
|
DBG1(DBG_ENC, "invalid SPI length in IKE proposal");
|
|
return FAILED;
|
|
}
|
|
break;
|
|
default:
|
|
DBG1(DBG_ENC, "invalid proposal protocol (%d)", this->protocol_id);
|
|
return FAILED;
|
|
}
|
|
if ((this->protocol_id == 0) || (this->protocol_id >= 4))
|
|
{
|
|
/* reserved are not supported */
|
|
DBG1(DBG_ENC, "invalid protocol");
|
|
return FAILED;
|
|
}
|
|
|
|
iterator = this->transforms->create_iterator(this->transforms,TRUE);
|
|
while(iterator->iterate(iterator, (void**)¤t_transform))
|
|
{
|
|
status = current_transform->verify(current_transform);
|
|
if (status != SUCCESS)
|
|
{
|
|
DBG1(DBG_ENC, "TRANSFORM_SUBSTRUCTURE verification failed");
|
|
break;
|
|
}
|
|
}
|
|
iterator->destroy(iterator);
|
|
|
|
/* proposal number is checked in SA payload */
|
|
return status;
|
|
}
|
|
|
|
/**
|
|
* Implementation of payload_t.get_encoding_rules.
|
|
*/
|
|
static void get_encoding_rules(private_proposal_substructure_t *this, encoding_rule_t **rules, size_t *rule_count)
|
|
{
|
|
*rules = proposal_substructure_encodings;
|
|
*rule_count = sizeof(proposal_substructure_encodings) / sizeof(encoding_rule_t);
|
|
}
|
|
|
|
/**
|
|
* Implementation of payload_t.get_type.
|
|
*/
|
|
static payload_type_t get_type(private_proposal_substructure_t *this)
|
|
{
|
|
return PROPOSAL_SUBSTRUCTURE;
|
|
}
|
|
|
|
/**
|
|
* Implementation of payload_t.get_next_type.
|
|
*/
|
|
static payload_type_t get_next_type(private_proposal_substructure_t *this)
|
|
{
|
|
return (this->next_payload);
|
|
}
|
|
|
|
/**
|
|
* Implementation of payload_t.set_next_type.
|
|
*/
|
|
static void set_next_type(private_proposal_substructure_t *this,payload_type_t type)
|
|
{
|
|
}
|
|
|
|
/**
|
|
* (re-)compute the length of the payload.
|
|
*/
|
|
static void compute_length(private_proposal_substructure_t *this)
|
|
{
|
|
iterator_t *iterator;
|
|
payload_t *current_transform;
|
|
size_t transforms_count = 0;
|
|
size_t length = PROPOSAL_SUBSTRUCTURE_HEADER_LENGTH;
|
|
|
|
iterator = this->transforms->create_iterator(this->transforms,TRUE);
|
|
while (iterator->iterate(iterator, (void**)¤t_transform))
|
|
{
|
|
length += current_transform->get_length(current_transform);
|
|
transforms_count++;
|
|
}
|
|
iterator->destroy(iterator);
|
|
|
|
length += this->spi.len;
|
|
this->transforms_count = transforms_count;
|
|
this->proposal_length = length;
|
|
}
|
|
|
|
/**
|
|
* Implementation of payload_t.get_length.
|
|
*/
|
|
static size_t get_length(private_proposal_substructure_t *this)
|
|
{
|
|
compute_length(this);
|
|
return this->proposal_length;
|
|
}
|
|
|
|
/**
|
|
* Implementation of proposal_substructure_t.create_transform_substructure_iterator.
|
|
*/
|
|
static iterator_t *create_transform_substructure_iterator (private_proposal_substructure_t *this,bool forward)
|
|
{
|
|
return (this->transforms->create_iterator(this->transforms,forward));
|
|
}
|
|
|
|
/**
|
|
* Implementation of proposal_substructure_t.add_transform_substructure.
|
|
*/
|
|
static void add_transform_substructure (private_proposal_substructure_t *this,transform_substructure_t *transform)
|
|
{
|
|
status_t status;
|
|
if (this->transforms->get_count(this->transforms) > 0)
|
|
{
|
|
transform_substructure_t *last_transform;
|
|
status = this->transforms->get_last(this->transforms,(void **) &last_transform);
|
|
/* last transform is now not anymore last one */
|
|
last_transform->set_is_last_transform(last_transform,FALSE);
|
|
|
|
}
|
|
transform->set_is_last_transform(transform,TRUE);
|
|
|
|
this->transforms->insert_last(this->transforms,(void *) transform);
|
|
compute_length(this);
|
|
}
|
|
|
|
/**
|
|
* Implementation of proposal_substructure_t.proposal_substructure_t.
|
|
*/
|
|
static void set_is_last_proposal (private_proposal_substructure_t *this, bool is_last)
|
|
{
|
|
this->next_payload = (is_last) ? 0: PROPOSAL_TYPE_VALUE;
|
|
}
|
|
|
|
/**
|
|
* Implementation of proposal_substructure_t.set_proposal_number.
|
|
*/
|
|
static void set_proposal_number(private_proposal_substructure_t *this,u_int8_t proposal_number)
|
|
{
|
|
this->proposal_number = proposal_number;
|
|
}
|
|
|
|
/**
|
|
* Implementation of proposal_substructure_t.get_proposal_number.
|
|
*/
|
|
static u_int8_t get_proposal_number (private_proposal_substructure_t *this)
|
|
{
|
|
return (this->proposal_number);
|
|
}
|
|
|
|
/**
|
|
* Implementation of proposal_substructure_t.set_protocol_id.
|
|
*/
|
|
static void set_protocol_id(private_proposal_substructure_t *this,u_int8_t protocol_id)
|
|
{
|
|
this->protocol_id = protocol_id;
|
|
}
|
|
|
|
/**
|
|
* Implementation of proposal_substructure_t.get_protocol_id.
|
|
*/
|
|
static u_int8_t get_protocol_id(private_proposal_substructure_t *this)
|
|
{
|
|
return (this->protocol_id);
|
|
}
|
|
|
|
/**
|
|
* Implementation of proposal_substructure_t.set_spi.
|
|
*/
|
|
static void set_spi(private_proposal_substructure_t *this, chunk_t spi)
|
|
{
|
|
/* first delete already set spi value */
|
|
if (this->spi.ptr != NULL)
|
|
{
|
|
free(this->spi.ptr);
|
|
this->spi.ptr = NULL;
|
|
this->spi.len = 0;
|
|
compute_length(this);
|
|
}
|
|
|
|
this->spi.ptr = clalloc(spi.ptr,spi.len);
|
|
this->spi.len = spi.len;
|
|
this->spi_size = spi.len;
|
|
compute_length(this);
|
|
}
|
|
|
|
/**
|
|
* Implementation of proposal_substructure_t.get_spi.
|
|
*/
|
|
static chunk_t get_spi(private_proposal_substructure_t *this)
|
|
{
|
|
chunk_t spi;
|
|
spi.ptr = this->spi.ptr;
|
|
spi.len = this->spi.len;
|
|
|
|
return spi;
|
|
}
|
|
|
|
/**
|
|
* Implementation of proposal_substructure_t.get_transform_count.
|
|
*/
|
|
static size_t get_transform_count (private_proposal_substructure_t *this)
|
|
{
|
|
return this->transforms->get_count(this->transforms);
|
|
}
|
|
|
|
/**
|
|
* Implementation of proposal_substructure_t.get_spi_size.
|
|
*/
|
|
static size_t get_spi_size (private_proposal_substructure_t *this)
|
|
{
|
|
return this->spi.len;
|
|
}
|
|
|
|
/**
|
|
* Implementation of proposal_substructure_t.get_proposal.
|
|
*/
|
|
proposal_t* get_proposal(private_proposal_substructure_t *this)
|
|
{
|
|
iterator_t *iterator;
|
|
transform_substructure_t *transform;
|
|
proposal_t *proposal;
|
|
u_int64_t spi;
|
|
|
|
proposal = proposal_create(this->protocol_id);
|
|
|
|
iterator = this->transforms->create_iterator(this->transforms, TRUE);
|
|
while (iterator->iterate(iterator, (void**)&transform))
|
|
{
|
|
transform_type_t transform_type;
|
|
u_int16_t transform_id;
|
|
u_int16_t key_length = 0;
|
|
|
|
transform_type = transform->get_transform_type(transform);
|
|
transform_id = transform->get_transform_id(transform);
|
|
transform->get_key_length(transform, &key_length);
|
|
|
|
proposal->add_algorithm(proposal, transform_type, transform_id, key_length);
|
|
}
|
|
iterator->destroy(iterator);
|
|
|
|
switch (this->spi.len)
|
|
{
|
|
case 4:
|
|
spi = *((u_int32_t*)this->spi.ptr);
|
|
break;
|
|
case 8:
|
|
spi = *((u_int64_t*)this->spi.ptr);
|
|
break;
|
|
default:
|
|
spi = 0;
|
|
}
|
|
proposal->set_spi(proposal, spi);
|
|
|
|
return proposal;
|
|
}
|
|
|
|
/**
|
|
* Implementation of proposal_substructure_t.clone.
|
|
*/
|
|
static private_proposal_substructure_t* clone_(private_proposal_substructure_t *this)
|
|
{
|
|
private_proposal_substructure_t *clone;
|
|
iterator_t *transforms;
|
|
transform_substructure_t *current_transform;
|
|
|
|
clone = (private_proposal_substructure_t *) proposal_substructure_create();
|
|
clone->next_payload = this->next_payload;
|
|
clone->proposal_number = this->proposal_number;
|
|
clone->protocol_id = this->protocol_id;
|
|
clone->spi_size = this->spi_size;
|
|
if (this->spi.ptr != NULL)
|
|
{
|
|
clone->spi.ptr = clalloc(this->spi.ptr,this->spi.len);
|
|
clone->spi.len = this->spi.len;
|
|
}
|
|
|
|
transforms = this->transforms->create_iterator(this->transforms,FALSE);
|
|
while (transforms->iterate(transforms, (void**)¤t_transform))
|
|
{
|
|
current_transform = current_transform->clone(current_transform);
|
|
clone->public.add_transform_substructure(&clone->public, current_transform);
|
|
}
|
|
transforms->destroy(transforms);
|
|
|
|
return clone;
|
|
}
|
|
|
|
/**
|
|
* Implements payload_t's and proposal_substructure_t's destroy function.
|
|
* See #payload_s.destroy or proposal_substructure_s.destroy for description.
|
|
*/
|
|
static void destroy(private_proposal_substructure_t *this)
|
|
{
|
|
this->transforms->destroy_offset(this->transforms,
|
|
offsetof(transform_substructure_t, destroy));
|
|
chunk_free(&this->spi);
|
|
free(this);
|
|
}
|
|
|
|
/*
|
|
* Described in header.
|
|
*/
|
|
proposal_substructure_t *proposal_substructure_create()
|
|
{
|
|
private_proposal_substructure_t *this = malloc_thing(private_proposal_substructure_t);
|
|
|
|
/* interface functions */
|
|
this->public.payload_interface.verify = (status_t (*) (payload_t *))verify;
|
|
this->public.payload_interface.get_encoding_rules = (void (*) (payload_t *, encoding_rule_t **, size_t *) ) get_encoding_rules;
|
|
this->public.payload_interface.get_length = (size_t (*) (payload_t *)) get_length;
|
|
this->public.payload_interface.get_next_type = (payload_type_t (*) (payload_t *)) get_next_type;
|
|
this->public.payload_interface.set_next_type = (void (*) (payload_t *,payload_type_t)) set_next_type;
|
|
this->public.payload_interface.get_type = (payload_type_t (*) (payload_t *)) get_type;
|
|
this->public.payload_interface.destroy = (void (*) (payload_t *))destroy;
|
|
|
|
|
|
/* public functions */
|
|
this->public.create_transform_substructure_iterator = (iterator_t* (*) (proposal_substructure_t *,bool)) create_transform_substructure_iterator;
|
|
this->public.add_transform_substructure = (void (*) (proposal_substructure_t *,transform_substructure_t *)) add_transform_substructure;
|
|
this->public.set_proposal_number = (void (*) (proposal_substructure_t *,u_int8_t))set_proposal_number;
|
|
this->public.get_proposal_number = (u_int8_t (*) (proposal_substructure_t *)) get_proposal_number;
|
|
this->public.set_protocol_id = (void (*) (proposal_substructure_t *,u_int8_t))set_protocol_id;
|
|
this->public.get_protocol_id = (u_int8_t (*) (proposal_substructure_t *)) get_protocol_id;
|
|
this->public.set_is_last_proposal = (void (*) (proposal_substructure_t *,bool)) set_is_last_proposal;
|
|
this->public.get_proposal = (proposal_t* (*) (proposal_substructure_t*))get_proposal;
|
|
this->public.set_spi = (void (*) (proposal_substructure_t *,chunk_t))set_spi;
|
|
this->public.get_spi = (chunk_t (*) (proposal_substructure_t *)) get_spi;
|
|
this->public.get_transform_count = (size_t (*) (proposal_substructure_t *)) get_transform_count;
|
|
this->public.get_spi_size = (size_t (*) (proposal_substructure_t *)) get_spi_size;
|
|
this->public.clone = (proposal_substructure_t * (*) (proposal_substructure_t *)) clone_;
|
|
this->public.destroy = (void (*) (proposal_substructure_t *)) destroy;
|
|
|
|
/* set default values of the fields */
|
|
this->next_payload = NO_PAYLOAD;
|
|
this->proposal_length = 0;
|
|
this->proposal_number = 0;
|
|
this->protocol_id = 0;
|
|
this->transforms_count = 0;
|
|
this->spi_size = 0;
|
|
this->spi.ptr = NULL;
|
|
this->spi.len = 0;
|
|
|
|
this->transforms = linked_list_create();
|
|
|
|
return (&(this->public));
|
|
}
|
|
|
|
/*
|
|
* Described in header.
|
|
*/
|
|
proposal_substructure_t *proposal_substructure_create_from_proposal(proposal_t *proposal)
|
|
{
|
|
transform_substructure_t *transform;
|
|
private_proposal_substructure_t *this;
|
|
u_int16_t alg, key_size;
|
|
enumerator_t *enumerator;
|
|
|
|
this = (private_proposal_substructure_t*)proposal_substructure_create();
|
|
|
|
/* encryption algorithm is only availble in ESP */
|
|
enumerator = proposal->create_enumerator(proposal, ENCRYPTION_ALGORITHM);
|
|
while (enumerator->enumerate(enumerator, &alg, &key_size))
|
|
{
|
|
transform = transform_substructure_create_type(ENCRYPTION_ALGORITHM,
|
|
alg, key_size);
|
|
add_transform_substructure(this, transform);
|
|
}
|
|
enumerator->destroy(enumerator);
|
|
|
|
/* integrity algorithms */
|
|
enumerator = proposal->create_enumerator(proposal, INTEGRITY_ALGORITHM);
|
|
while (enumerator->enumerate(enumerator, &alg, &key_size))
|
|
{
|
|
transform = transform_substructure_create_type(INTEGRITY_ALGORITHM,
|
|
alg, key_size);
|
|
add_transform_substructure(this, transform);
|
|
}
|
|
enumerator->destroy(enumerator);
|
|
|
|
/* prf algorithms */
|
|
enumerator = proposal->create_enumerator(proposal, PSEUDO_RANDOM_FUNCTION);
|
|
while (enumerator->enumerate(enumerator, &alg, &key_size))
|
|
{
|
|
transform = transform_substructure_create_type(PSEUDO_RANDOM_FUNCTION,
|
|
alg, key_size);
|
|
add_transform_substructure(this, transform);
|
|
}
|
|
enumerator->destroy(enumerator);
|
|
|
|
/* dh groups */
|
|
enumerator = proposal->create_enumerator(proposal, DIFFIE_HELLMAN_GROUP);
|
|
while (enumerator->enumerate(enumerator, &alg, NULL))
|
|
{
|
|
transform = transform_substructure_create_type(DIFFIE_HELLMAN_GROUP,
|
|
alg, 0);
|
|
add_transform_substructure(this, transform);
|
|
}
|
|
enumerator->destroy(enumerator);
|
|
|
|
/* extended sequence numbers */
|
|
enumerator = proposal->create_enumerator(proposal, EXTENDED_SEQUENCE_NUMBERS);
|
|
while (enumerator->enumerate(enumerator, &alg, NULL))
|
|
{
|
|
transform = transform_substructure_create_type(EXTENDED_SEQUENCE_NUMBERS,
|
|
alg, 0);
|
|
add_transform_substructure(this, transform);
|
|
}
|
|
enumerator->destroy(enumerator);
|
|
|
|
/* add SPI, if necessary */
|
|
switch (proposal->get_protocol(proposal))
|
|
{
|
|
case PROTO_AH:
|
|
case PROTO_ESP:
|
|
this->spi_size = this->spi.len = 4;
|
|
this->spi.ptr = malloc(this->spi_size);
|
|
*((u_int32_t*)this->spi.ptr) = proposal->get_spi(proposal);
|
|
break;
|
|
case PROTO_IKE:
|
|
if (proposal->get_spi(proposal))
|
|
{ /* IKE only uses SPIS when rekeying, but on initial setup */
|
|
this->spi_size = this->spi.len = 8;
|
|
this->spi.ptr = malloc(this->spi_size);
|
|
*((u_int64_t*)this->spi.ptr) = proposal->get_spi(proposal);
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
this->proposal_number = 0;
|
|
this->protocol_id = proposal->get_protocol(proposal);
|
|
|
|
return &this->public;
|
|
}
|