359 lines
12 KiB
C
359 lines
12 KiB
C
/**
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* \file asn1.h
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*
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* \brief Generic ASN.1 parsing
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*/
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/*
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* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* This file is part of mbed TLS (https://tls.mbed.org)
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*/
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#ifndef MBEDTLS_ASN1_H
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#define MBEDTLS_ASN1_H
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#if !defined(MBEDTLS_CONFIG_FILE)
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#include "config.h"
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#else
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#include MBEDTLS_CONFIG_FILE
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#endif
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#include <stddef.h>
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#if defined(MBEDTLS_BIGNUM_C)
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#include "bignum.h"
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#endif
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/**
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* \addtogroup asn1_module
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* \{
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*/
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/**
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* \name ASN1 Error codes
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* These error codes are OR'ed to X509 error codes for
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* higher error granularity.
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* ASN1 is a standard to specify data structures.
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* \{
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*/
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#define MBEDTLS_ERR_ASN1_OUT_OF_DATA -0x0060 /**< Out of data when parsing an ASN1 data structure. */
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#define MBEDTLS_ERR_ASN1_UNEXPECTED_TAG -0x0062 /**< ASN1 tag was of an unexpected value. */
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#define MBEDTLS_ERR_ASN1_INVALID_LENGTH -0x0064 /**< Error when trying to determine the length or invalid length. */
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#define MBEDTLS_ERR_ASN1_LENGTH_MISMATCH -0x0066 /**< Actual length differs from expected length. */
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#define MBEDTLS_ERR_ASN1_INVALID_DATA -0x0068 /**< Data is invalid. (not used) */
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#define MBEDTLS_ERR_ASN1_ALLOC_FAILED -0x006A /**< Memory allocation failed */
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#define MBEDTLS_ERR_ASN1_BUF_TOO_SMALL -0x006C /**< Buffer too small when writing ASN.1 data structure. */
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/* \} name */
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/**
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* \name DER constants
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* These constants comply with the DER encoded ASN.1 type tags.
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* DER encoding uses hexadecimal representation.
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* An example DER sequence is:\n
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* - 0x02 -- tag indicating INTEGER
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* - 0x01 -- length in octets
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* - 0x05 -- value
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* Such sequences are typically read into \c ::mbedtls_x509_buf.
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* \{
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*/
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#define MBEDTLS_ASN1_BOOLEAN 0x01
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#define MBEDTLS_ASN1_INTEGER 0x02
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#define MBEDTLS_ASN1_BIT_STRING 0x03
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#define MBEDTLS_ASN1_OCTET_STRING 0x04
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#define MBEDTLS_ASN1_NULL 0x05
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#define MBEDTLS_ASN1_OID 0x06
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#define MBEDTLS_ASN1_UTF8_STRING 0x0C
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#define MBEDTLS_ASN1_SEQUENCE 0x10
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#define MBEDTLS_ASN1_SET 0x11
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#define MBEDTLS_ASN1_PRINTABLE_STRING 0x13
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#define MBEDTLS_ASN1_T61_STRING 0x14
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#define MBEDTLS_ASN1_IA5_STRING 0x16
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#define MBEDTLS_ASN1_UTC_TIME 0x17
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#define MBEDTLS_ASN1_GENERALIZED_TIME 0x18
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#define MBEDTLS_ASN1_UNIVERSAL_STRING 0x1C
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#define MBEDTLS_ASN1_BMP_STRING 0x1E
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#define MBEDTLS_ASN1_PRIMITIVE 0x00
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#define MBEDTLS_ASN1_CONSTRUCTED 0x20
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#define MBEDTLS_ASN1_CONTEXT_SPECIFIC 0x80
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/*
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* Bit masks for each of the components of an ASN.1 tag as specified in
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* ITU X.690 (08/2015), section 8.1 "General rules for encoding",
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* paragraph 8.1.2.2:
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*
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* Bit 8 7 6 5 1
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* +-------+-----+------------+
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* | Class | P/C | Tag number |
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* +-------+-----+------------+
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*/
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#define MBEDTLS_ASN1_TAG_CLASS_MASK 0xC0
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#define MBEDTLS_ASN1_TAG_PC_MASK 0x20
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#define MBEDTLS_ASN1_TAG_VALUE_MASK 0x1F
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/* \} name */
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/* \} addtogroup asn1_module */
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/** Returns the size of the binary string, without the trailing \\0 */
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#define MBEDTLS_OID_SIZE(x) (sizeof(x) - 1)
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/**
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* Compares an mbedtls_asn1_buf structure to a reference OID.
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*
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* Only works for 'defined' oid_str values (MBEDTLS_OID_HMAC_SHA1), you cannot use a
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* 'unsigned char *oid' here!
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*/
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#define MBEDTLS_OID_CMP(oid_str, oid_buf) \
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( ( MBEDTLS_OID_SIZE(oid_str) != (oid_buf)->len ) || \
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memcmp( (oid_str), (oid_buf)->p, (oid_buf)->len) != 0 )
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* \name Functions to parse ASN.1 data structures
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* \{
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*/
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/**
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* Type-length-value structure that allows for ASN1 using DER.
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*/
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typedef struct mbedtls_asn1_buf
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{
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int tag; /**< ASN1 type, e.g. MBEDTLS_ASN1_UTF8_STRING. */
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size_t len; /**< ASN1 length, in octets. */
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unsigned char *p; /**< ASN1 data, e.g. in ASCII. */
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}
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mbedtls_asn1_buf;
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/**
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* Container for ASN1 bit strings.
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*/
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typedef struct mbedtls_asn1_bitstring
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{
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size_t len; /**< ASN1 length, in octets. */
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unsigned char unused_bits; /**< Number of unused bits at the end of the string */
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unsigned char *p; /**< Raw ASN1 data for the bit string */
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}
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mbedtls_asn1_bitstring;
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/**
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* Container for a sequence of ASN.1 items
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*/
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typedef struct mbedtls_asn1_sequence
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{
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mbedtls_asn1_buf buf; /**< Buffer containing the given ASN.1 item. */
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struct mbedtls_asn1_sequence *next; /**< The next entry in the sequence. */
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}
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mbedtls_asn1_sequence;
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/**
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* Container for a sequence or list of 'named' ASN.1 data items
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*/
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typedef struct mbedtls_asn1_named_data
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{
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mbedtls_asn1_buf oid; /**< The object identifier. */
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mbedtls_asn1_buf val; /**< The named value. */
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struct mbedtls_asn1_named_data *next; /**< The next entry in the sequence. */
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unsigned char next_merged; /**< Merge next item into the current one? */
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}
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mbedtls_asn1_named_data;
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/**
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* \brief Get the length of an ASN.1 element.
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* Updates the pointer to immediately behind the length.
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*
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* \param p The position in the ASN.1 data
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* \param end End of data
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* \param len The variable that will receive the value
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*
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* \return 0 if successful, MBEDTLS_ERR_ASN1_OUT_OF_DATA on reaching
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* end of data, MBEDTLS_ERR_ASN1_INVALID_LENGTH if length is
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* unparseable.
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*/
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int mbedtls_asn1_get_len( unsigned char **p,
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const unsigned char *end,
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size_t *len );
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/**
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* \brief Get the tag and length of the tag. Check for the requested tag.
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* Updates the pointer to immediately behind the tag and length.
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*
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* \param p The position in the ASN.1 data
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* \param end End of data
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* \param len The variable that will receive the length
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* \param tag The expected tag
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*
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* \return 0 if successful, MBEDTLS_ERR_ASN1_UNEXPECTED_TAG if tag did
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* not match requested tag, or another specific ASN.1 error code.
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*/
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int mbedtls_asn1_get_tag( unsigned char **p,
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const unsigned char *end,
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size_t *len, int tag );
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/**
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* \brief Retrieve a boolean ASN.1 tag and its value.
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* Updates the pointer to immediately behind the full tag.
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*
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* \param p The position in the ASN.1 data
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* \param end End of data
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* \param val The variable that will receive the value
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*
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* \return 0 if successful or a specific ASN.1 error code.
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*/
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int mbedtls_asn1_get_bool( unsigned char **p,
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const unsigned char *end,
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int *val );
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/**
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* \brief Retrieve an integer ASN.1 tag and its value.
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* Updates the pointer to immediately behind the full tag.
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*
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* \param p The position in the ASN.1 data
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* \param end End of data
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* \param val The variable that will receive the value
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*
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* \return 0 if successful or a specific ASN.1 error code.
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*/
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int mbedtls_asn1_get_int( unsigned char **p,
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const unsigned char *end,
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int *val );
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/**
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* \brief Retrieve a bitstring ASN.1 tag and its value.
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* Updates the pointer to immediately behind the full tag.
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*
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* \param p The position in the ASN.1 data
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* \param end End of data
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* \param bs The variable that will receive the value
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*
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* \return 0 if successful or a specific ASN.1 error code.
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*/
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int mbedtls_asn1_get_bitstring( unsigned char **p, const unsigned char *end,
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mbedtls_asn1_bitstring *bs);
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/**
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* \brief Retrieve a bitstring ASN.1 tag without unused bits and its
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* value.
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* Updates the pointer to the beginning of the bit/octet string.
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*
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* \param p The position in the ASN.1 data
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* \param end End of data
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* \param len Length of the actual bit/octect string in bytes
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*
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* \return 0 if successful or a specific ASN.1 error code.
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*/
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int mbedtls_asn1_get_bitstring_null( unsigned char **p, const unsigned char *end,
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size_t *len );
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/**
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* \brief Parses and splits an ASN.1 "SEQUENCE OF <tag>"
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* Updated the pointer to immediately behind the full sequence tag.
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*
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* \param p The position in the ASN.1 data
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* \param end End of data
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* \param cur First variable in the chain to fill
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* \param tag Type of sequence
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*
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* \return 0 if successful or a specific ASN.1 error code.
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*/
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int mbedtls_asn1_get_sequence_of( unsigned char **p,
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const unsigned char *end,
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mbedtls_asn1_sequence *cur,
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int tag);
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#if defined(MBEDTLS_BIGNUM_C)
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/**
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* \brief Retrieve a MPI value from an integer ASN.1 tag.
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* Updates the pointer to immediately behind the full tag.
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*
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* \param p The position in the ASN.1 data
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* \param end End of data
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* \param X The MPI that will receive the value
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*
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* \return 0 if successful or a specific ASN.1 or MPI error code.
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*/
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int mbedtls_asn1_get_mpi( unsigned char **p,
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const unsigned char *end,
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mbedtls_mpi *X );
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#endif /* MBEDTLS_BIGNUM_C */
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/**
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* \brief Retrieve an AlgorithmIdentifier ASN.1 sequence.
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* Updates the pointer to immediately behind the full
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* AlgorithmIdentifier.
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*
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* \param p The position in the ASN.1 data
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* \param end End of data
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* \param alg The buffer to receive the OID
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* \param params The buffer to receive the params (if any)
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*
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* \return 0 if successful or a specific ASN.1 or MPI error code.
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*/
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int mbedtls_asn1_get_alg( unsigned char **p,
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const unsigned char *end,
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mbedtls_asn1_buf *alg, mbedtls_asn1_buf *params );
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/**
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* \brief Retrieve an AlgorithmIdentifier ASN.1 sequence with NULL or no
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* params.
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* Updates the pointer to immediately behind the full
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* AlgorithmIdentifier.
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*
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* \param p The position in the ASN.1 data
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* \param end End of data
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* \param alg The buffer to receive the OID
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*
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* \return 0 if successful or a specific ASN.1 or MPI error code.
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*/
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int mbedtls_asn1_get_alg_null( unsigned char **p,
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const unsigned char *end,
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mbedtls_asn1_buf *alg );
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/**
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* \brief Find a specific named_data entry in a sequence or list based on
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* the OID.
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*
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* \param list The list to seek through
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* \param oid The OID to look for
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* \param len Size of the OID
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*
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* \return NULL if not found, or a pointer to the existing entry.
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*/
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mbedtls_asn1_named_data *mbedtls_asn1_find_named_data( mbedtls_asn1_named_data *list,
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const char *oid, size_t len );
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/**
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* \brief Free a mbedtls_asn1_named_data entry
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*
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* \param entry The named data entry to free
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*/
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void mbedtls_asn1_free_named_data( mbedtls_asn1_named_data *entry );
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/**
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* \brief Free all entries in a mbedtls_asn1_named_data list
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* Head will be set to NULL
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*
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* \param head Pointer to the head of the list of named data entries to free
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*/
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void mbedtls_asn1_free_named_data_list( mbedtls_asn1_named_data **head );
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#ifdef __cplusplus
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}
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#endif
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#endif /* asn1.h */
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