325 lines
7.5 KiB
C
325 lines
7.5 KiB
C
/*
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* Copyright (C) 2005-2010 Martin Willi
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* Copyright (C) 2010 revosec AG
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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 <daemon.h>
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#include <crypto/hashers/hasher.h>
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#include <encoding/payloads/cert_payload.h>
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#include "certreq_payload.h"
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typedef struct private_certreq_payload_t private_certreq_payload_t;
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/**
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* Private data of an certreq_payload_t object.
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*/
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struct private_certreq_payload_t {
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/**
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* Public certreq_payload_t interface.
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*/
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certreq_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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* Reserved bits
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*/
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bool reserved[7];
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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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* Encoding of the CERT Data.
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*/
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u_int8_t encoding;
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/**
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* The contained certreq data value.
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*/
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chunk_t data;
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/**
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* Payload type PLV2_CERTREQ or PLV1_CERTREQ
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*/
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payload_type_t type;
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};
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/**
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* Encoding rules for CERTREQ payload.
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*/
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static encoding_rule_t 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_certreq_payload_t, next_payload) },
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/* the critical bit */
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{ FLAG, offsetof(private_certreq_payload_t, critical) },
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/* 7 Bit reserved bits */
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{ RESERVED_BIT, offsetof(private_certreq_payload_t, reserved[0]) },
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{ RESERVED_BIT, offsetof(private_certreq_payload_t, reserved[1]) },
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{ RESERVED_BIT, offsetof(private_certreq_payload_t, reserved[2]) },
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{ RESERVED_BIT, offsetof(private_certreq_payload_t, reserved[3]) },
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{ RESERVED_BIT, offsetof(private_certreq_payload_t, reserved[4]) },
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{ RESERVED_BIT, offsetof(private_certreq_payload_t, reserved[5]) },
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{ RESERVED_BIT, offsetof(private_certreq_payload_t, reserved[6]) },
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/* Length of the whole payload*/
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{ PAYLOAD_LENGTH, offsetof(private_certreq_payload_t, payload_length) },
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/* 1 Byte CERTREQ type*/
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{ U_INT_8, offsetof(private_certreq_payload_t, encoding) },
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/* some certreq data bytes, length is defined in PAYLOAD_LENGTH */
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{ CHUNK_DATA, offsetof(private_certreq_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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! Cert Encoding ! !
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+-+-+-+-+-+-+-+-+ !
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~ Certification Authority ~
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! !
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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METHOD(payload_t, verify, status_t,
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private_certreq_payload_t *this)
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{
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if (this->type == PLV2_CERTREQ &&
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this->encoding == ENC_X509_SIGNATURE)
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{
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if (this->data.len % HASH_SIZE_SHA1)
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{
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DBG1(DBG_ENC, "invalid X509 hash length (%d) in certreq",
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this->data.len);
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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_certreq_payload_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_certreq_payload_t *this)
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{
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return 5;
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}
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METHOD(payload_t, get_type, payload_type_t,
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private_certreq_payload_t *this)
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{
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return this->type;
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}
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METHOD(payload_t, get_next_type, payload_type_t,
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private_certreq_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_certreq_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_certreq_payload_t *this)
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{
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return this->payload_length;
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}
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METHOD(certreq_payload_t, get_dn, identification_t*,
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private_certreq_payload_t *this)
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{
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if (this->data.len)
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{
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return identification_create_from_encoding(ID_DER_ASN1_DN, this->data);
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}
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return NULL;
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}
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METHOD(certreq_payload_t, add_keyid, void,
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private_certreq_payload_t *this, chunk_t keyid)
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{
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this->data = chunk_cat("mc", this->data, keyid);
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this->payload_length += keyid.len;
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}
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typedef struct keyid_enumerator_t keyid_enumerator_t;
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/**
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* enumerator to enumerate keyids
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*/
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struct keyid_enumerator_t {
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enumerator_t public;
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chunk_t full;
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u_char *pos;
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};
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METHOD(enumerator_t, keyid_enumerate, bool,
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keyid_enumerator_t *this, chunk_t *chunk)
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{
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if (this->pos == NULL)
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{
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this->pos = this->full.ptr;
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}
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else
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{
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this->pos += HASH_SIZE_SHA1;
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if (this->pos > (this->full.ptr + this->full.len - HASH_SIZE_SHA1))
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{
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this->pos = NULL;
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}
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}
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if (this->pos)
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{
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chunk->ptr = this->pos;
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chunk->len = HASH_SIZE_SHA1;
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return TRUE;
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}
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return FALSE;
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}
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METHOD(certreq_payload_t, create_keyid_enumerator, enumerator_t*,
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private_certreq_payload_t *this)
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{
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keyid_enumerator_t *enumerator;
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if (this->type == PLV1_CERTREQ)
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{
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return enumerator_create_empty();
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}
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INIT(enumerator,
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.public = {
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.enumerate = (void*)_keyid_enumerate,
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.destroy = (void*)free,
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},
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.full = this->data,
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);
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return &enumerator->public;
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}
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METHOD(certreq_payload_t, get_cert_type, certificate_type_t,
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private_certreq_payload_t *this)
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{
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switch (this->encoding)
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{
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case ENC_X509_SIGNATURE:
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return CERT_X509;
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default:
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return CERT_ANY;
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}
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}
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METHOD2(payload_t, certreq_payload_t, destroy, void,
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private_certreq_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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certreq_payload_t *certreq_payload_create(payload_type_t type)
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{
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private_certreq_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_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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.create_keyid_enumerator = _create_keyid_enumerator,
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.get_cert_type = _get_cert_type,
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.add_keyid = _add_keyid,
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.destroy = _destroy,
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.get_dn = _get_dn,
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},
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.next_payload = PL_NONE,
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.payload_length = get_header_length(this),
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.type = type,
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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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certreq_payload_t *certreq_payload_create_type(certificate_type_t type)
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{
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private_certreq_payload_t *this;
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this = (private_certreq_payload_t*)
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certreq_payload_create(PLV2_CERTREQ);
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switch (type)
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{
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case CERT_X509:
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this->encoding = ENC_X509_SIGNATURE;
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break;
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default:
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DBG1(DBG_ENC, "certificate type %N not supported in requests",
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certificate_type_names, type);
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free(this);
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return NULL;
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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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certreq_payload_t *certreq_payload_create_dn(identification_t *id)
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{
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private_certreq_payload_t *this;
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this = (private_certreq_payload_t*)
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certreq_payload_create(PLV1_CERTREQ);
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this->encoding = ENC_X509_SIGNATURE;
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this->data = chunk_clone(id->get_encoding(id));
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this->payload_length = get_header_length(this) + this->data.len;
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return &this->public;
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}
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