www.pudn.com > strongswan-4.2.4.rar > certreq_payload.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 .
*
* 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.
*
* $Id: certreq_payload.c 3589 2008-03-13 14:14:44Z martin $
*/
#include
#include
#include
#include
#include "certreq_payload.h"
typedef struct private_certreq_payload_t private_certreq_payload_t;
/**
* Private data of an certreq_payload_t object.
*
*/
struct private_certreq_payload_t {
/**
* Public certreq_payload_t interface.
*/
certreq_payload_t public;
/**
* Next payload type.
*/
u_int8_t next_payload;
/**
* Critical flag.
*/
bool critical;
/**
* Length of this payload.
*/
u_int16_t payload_length;
/**
* Encoding of the CERT Data.
*/
u_int8_t encoding;
/**
* The contained certreq data value.
*/
chunk_t data;
};
/**
* Encoding rules to parse or generate a CERTREQ payload
*
* The defined offsets are the positions in a object of type
* private_certreq_payload_t.
*
*/
encoding_rule_t certreq_payload_encodings[] = {
/* 1 Byte next payload type, stored in the field next_payload */
{ U_INT_8, offsetof(private_certreq_payload_t, next_payload) },
/* the critical bit */
{ FLAG, offsetof(private_certreq_payload_t, critical) },
/* 7 Bit reserved bits, nowhere stored */
{ RESERVED_BIT, 0 },
{ RESERVED_BIT, 0 },
{ RESERVED_BIT, 0 },
{ RESERVED_BIT, 0 },
{ RESERVED_BIT, 0 },
{ RESERVED_BIT, 0 },
{ RESERVED_BIT, 0 },
/* Length of the whole payload*/
{ PAYLOAD_LENGTH, offsetof(private_certreq_payload_t, payload_length) },
/* 1 Byte CERTREQ type*/
{ U_INT_8, offsetof(private_certreq_payload_t, encoding) },
/* some certreq data bytes, length is defined in PAYLOAD_LENGTH */
{ CERTREQ_DATA, offsetof(private_certreq_payload_t, data) }
};
/*
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 !
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
! Cert Encoding ! !
+-+-+-+-+-+-+-+-+ !
~ Certification Authority ~
! !
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
/**
* Implementation of payload_t.verify.
*/
static status_t verify(private_certreq_payload_t *this)
{
if (this->encoding == ENC_X509_SIGNATURE)
{
if (this->data.len < HASH_SIZE_SHA1 ||
this->data.len % HASH_SIZE_SHA1)
{
DBG1(DBG_ENC, "invalid X509 hash length (%d) in certreq",
this->data.len);
return FAILED;
}
}
return SUCCESS;
}
/**
* Implementation of certreq_payload_t.get_encoding_rules.
*/
static void get_encoding_rules(private_certreq_payload_t *this, encoding_rule_t **rules, size_t *rule_count)
{
*rules = certreq_payload_encodings;
*rule_count = sizeof(certreq_payload_encodings) / sizeof(encoding_rule_t);
}
/**
* Implementation of payload_t.get_type.
*/
static payload_type_t get_payload_type(private_certreq_payload_t *this)
{
return CERTIFICATE_REQUEST;
}
/**
* Implementation of payload_t.get_next_type.
*/
static payload_type_t get_next_type(private_certreq_payload_t *this)
{
return (this->next_payload);
}
/**
* Implementation of payload_t.set_next_type.
*/
static void set_next_type(private_certreq_payload_t *this,payload_type_t type)
{
this->next_payload = type;
}
/**
* Implementation of payload_t.get_length.
*/
static size_t get_length(private_certreq_payload_t *this)
{
return this->payload_length;
}
/**
* Implementation of certreq_payload_t.add_keyid.
*/
static void add_keyid(private_certreq_payload_t *this, chunk_t keyid)
{
this->data = chunk_cat("mc", this->data, keyid);
this->payload_length += keyid.len;
}
typedef struct keyid_enumerator_t keyid_enumerator_t;
/**
* enumerator to enumerate keyids
*/
struct keyid_enumerator_t {
enumerator_t public;
chunk_t full;
u_char *pos;
};
/**
* enumerate function for keyid_enumerator
*/
static bool keyid_enumerate(keyid_enumerator_t *this, chunk_t *chunk)
{
if (this->pos == NULL)
{
this->pos = this->full.ptr;
}
else
{
this->pos += HASH_SIZE_SHA1;
if (this->pos > (this->full.ptr + this->full.len - HASH_SIZE_SHA1))
{
this->pos = NULL;
}
}
if (this->pos)
{
chunk->ptr = this->pos;
chunk->len = HASH_SIZE_SHA1;
return TRUE;
}
return FALSE;
}
/**
* Implementation of certreq_payload_t.create_keyid_enumerator.
*/
static enumerator_t* create_keyid_enumerator(private_certreq_payload_t *this)
{
keyid_enumerator_t *enumerator = malloc_thing(keyid_enumerator_t);
enumerator->public.enumerate = (void*)keyid_enumerate;
enumerator->public.destroy = (void*)free;
enumerator->full = this->data;
enumerator->pos = NULL;
return &enumerator->public;
}
/**
* Implementation of certreq_payload_t.get_cert_type.
*/
static certificate_type_t get_cert_type(private_certreq_payload_t *this)
{
switch (this->encoding)
{
case ENC_X509_SIGNATURE:
return CERT_X509;
default:
return CERT_ANY;
}
}
/**
* Implementation of payload_t.destroy and certreq_payload_t.destroy.
*/
static void destroy(private_certreq_payload_t *this)
{
chunk_free(&this->data);
free(this);
}
/*
* Described in header
*/
certreq_payload_t *certreq_payload_create()
{
private_certreq_payload_t *this = malloc_thing(private_certreq_payload_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_payload_type;
this->public.payload_interface.destroy = (void (*) (payload_t*))destroy;
/* public functions */
this->public.destroy = (void (*) (certreq_payload_t*)) destroy;
this->public.create_keyid_enumerator = (enumerator_t*(*)(certreq_payload_t*))create_keyid_enumerator;
this->public.get_cert_type = (certificate_type_t(*)(certreq_payload_t*))get_cert_type;
this->public.add_keyid = (void(*)(certreq_payload_t*, chunk_t keyid))add_keyid;
/* private variables */
this->critical = FALSE;
this->next_payload = NO_PAYLOAD;
this->payload_length = CERTREQ_PAYLOAD_HEADER_LENGTH;
this->data = chunk_empty;
this->encoding = 0;
return &this->public;
}
/*
* Described in header
*/
certreq_payload_t *certreq_payload_create_type(certificate_type_t type)
{
private_certreq_payload_t *this = (private_certreq_payload_t*)certreq_payload_create();
switch (type)
{
case CERT_X509:
this->encoding = ENC_X509_SIGNATURE;
break;
default:
DBG1(DBG_ENC, "certificate type %N not supported in requests",
certificate_type_names, type);
free(this);
return NULL;
}
return &this->public;
}