mirror of
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1e14827beb
As a result, the copyright of contributors other than Arm is now
acknowledged, and the years of publishing are no longer tracked in the
source files.
Also remove the now-redundant lines declaring that the files are part of
MbedTLS.
This commit was generated using the following script:
# ========================
#!/bin/sh
# Find files
find '(' -path './.git' -o -path './3rdparty' ')' -prune -o -type f -print | xargs sed -bi '
# Replace copyright attribution line
s/Copyright.*Arm.*/Copyright The Mbed TLS Contributors/I
# Remove redundant declaration and the preceding line
$!N
/This file is part of Mbed TLS/Id
P
D
'
# ========================
Signed-off-by: Bence Szépkúti <bence.szepkuti@arm.com>
482 lines
12 KiB
C
482 lines
12 KiB
C
/*
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* Generic ASN.1 parsing
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*
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* Copyright The Mbed TLS Contributors
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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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#include "common.h"
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#if defined(MBEDTLS_ASN1_PARSE_C)
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#include "mbedtls/asn1.h"
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#include "mbedtls/platform_util.h"
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#include "mbedtls/error.h"
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#include <string.h>
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#if defined(MBEDTLS_BIGNUM_C)
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#include "mbedtls/bignum.h"
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#endif
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#if defined(MBEDTLS_PLATFORM_C)
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#include "mbedtls/platform.h"
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#else
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#include <stdlib.h>
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#define mbedtls_calloc calloc
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#define mbedtls_free free
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#endif
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/*
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* ASN.1 DER decoding routines
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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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if( ( end - *p ) < 1 )
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return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
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if( ( **p & 0x80 ) == 0 )
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*len = *(*p)++;
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else
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{
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switch( **p & 0x7F )
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{
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case 1:
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if( ( end - *p ) < 2 )
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return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
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*len = (*p)[1];
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(*p) += 2;
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break;
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case 2:
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if( ( end - *p ) < 3 )
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return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
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*len = ( (size_t)(*p)[1] << 8 ) | (*p)[2];
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(*p) += 3;
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break;
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case 3:
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if( ( end - *p ) < 4 )
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return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
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*len = ( (size_t)(*p)[1] << 16 ) |
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( (size_t)(*p)[2] << 8 ) | (*p)[3];
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(*p) += 4;
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break;
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case 4:
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if( ( end - *p ) < 5 )
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return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
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*len = ( (size_t)(*p)[1] << 24 ) | ( (size_t)(*p)[2] << 16 ) |
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( (size_t)(*p)[3] << 8 ) | (*p)[4];
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(*p) += 5;
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break;
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default:
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return( MBEDTLS_ERR_ASN1_INVALID_LENGTH );
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}
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}
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if( *len > (size_t) ( end - *p ) )
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return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
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return( 0 );
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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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if( ( end - *p ) < 1 )
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return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
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if( **p != tag )
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return( MBEDTLS_ERR_ASN1_UNEXPECTED_TAG );
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(*p)++;
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return( mbedtls_asn1_get_len( p, end, len ) );
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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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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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size_t len;
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if( ( ret = mbedtls_asn1_get_tag( p, end, &len, MBEDTLS_ASN1_BOOLEAN ) ) != 0 )
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return( ret );
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if( len != 1 )
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return( MBEDTLS_ERR_ASN1_INVALID_LENGTH );
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*val = ( **p != 0 ) ? 1 : 0;
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(*p)++;
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return( 0 );
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}
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static int asn1_get_tagged_int( unsigned char **p,
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const unsigned char *end,
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int tag, int *val )
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{
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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size_t len;
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if( ( ret = mbedtls_asn1_get_tag( p, end, &len, tag ) ) != 0 )
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return( ret );
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/*
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* len==0 is malformed (0 must be represented as 020100 for INTEGER,
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* or 0A0100 for ENUMERATED tags
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*/
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if( len == 0 )
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return( MBEDTLS_ERR_ASN1_INVALID_LENGTH );
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/* This is a cryptography library. Reject negative integers. */
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if( ( **p & 0x80 ) != 0 )
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return( MBEDTLS_ERR_ASN1_INVALID_LENGTH );
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/* Skip leading zeros. */
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while( len > 0 && **p == 0 )
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{
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++( *p );
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--len;
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}
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/* Reject integers that don't fit in an int. This code assumes that
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* the int type has no padding bit. */
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if( len > sizeof( int ) )
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return( MBEDTLS_ERR_ASN1_INVALID_LENGTH );
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if( len == sizeof( int ) && ( **p & 0x80 ) != 0 )
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return( MBEDTLS_ERR_ASN1_INVALID_LENGTH );
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*val = 0;
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while( len-- > 0 )
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{
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*val = ( *val << 8 ) | **p;
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(*p)++;
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}
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return( 0 );
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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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return( asn1_get_tagged_int( p, end, MBEDTLS_ASN1_INTEGER, val) );
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}
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int mbedtls_asn1_get_enum( 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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return( asn1_get_tagged_int( p, end, MBEDTLS_ASN1_ENUMERATED, val) );
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}
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#if defined(MBEDTLS_BIGNUM_C)
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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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{
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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size_t len;
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if( ( ret = mbedtls_asn1_get_tag( p, end, &len, MBEDTLS_ASN1_INTEGER ) ) != 0 )
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return( ret );
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ret = mbedtls_mpi_read_binary( X, *p, len );
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*p += len;
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return( ret );
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}
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#endif /* MBEDTLS_BIGNUM_C */
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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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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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/* Certificate type is a single byte bitstring */
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if( ( ret = mbedtls_asn1_get_tag( p, end, &bs->len, MBEDTLS_ASN1_BIT_STRING ) ) != 0 )
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return( ret );
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/* Check length, subtract one for actual bit string length */
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if( bs->len < 1 )
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return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
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bs->len -= 1;
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/* Get number of unused bits, ensure unused bits <= 7 */
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bs->unused_bits = **p;
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if( bs->unused_bits > 7 )
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return( MBEDTLS_ERR_ASN1_INVALID_LENGTH );
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(*p)++;
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/* Get actual bitstring */
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bs->p = *p;
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*p += bs->len;
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if( *p != end )
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return( MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
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return( 0 );
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}
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/*
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* Traverse an ASN.1 "SEQUENCE OF <tag>"
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* and call a callback for each entry found.
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*/
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int mbedtls_asn1_traverse_sequence_of(
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unsigned char **p,
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const unsigned char *end,
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unsigned char tag_must_mask, unsigned char tag_must_val,
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unsigned char tag_may_mask, unsigned char tag_may_val,
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int (*cb)( void *ctx, int tag,
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unsigned char *start, size_t len ),
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void *ctx )
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{
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int ret;
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size_t len;
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/* Get main sequence tag */
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if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
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MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
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{
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return( ret );
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}
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if( *p + len != end )
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return( MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
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while( *p < end )
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{
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unsigned char const tag = *(*p)++;
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if( ( tag & tag_must_mask ) != tag_must_val )
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return( MBEDTLS_ERR_ASN1_UNEXPECTED_TAG );
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if( ( ret = mbedtls_asn1_get_len( p, end, &len ) ) != 0 )
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return( ret );
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if( ( tag & tag_may_mask ) == tag_may_val )
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{
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if( cb != NULL )
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{
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ret = cb( ctx, tag, *p, len );
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if( ret != 0 )
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return( ret );
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}
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}
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*p += len;
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}
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return( 0 );
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}
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/*
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* Get a bit string without unused bits
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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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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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if( ( ret = mbedtls_asn1_get_tag( p, end, len, MBEDTLS_ASN1_BIT_STRING ) ) != 0 )
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return( ret );
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if( *len == 0 )
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return( MBEDTLS_ERR_ASN1_INVALID_DATA );
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--( *len );
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if( **p != 0 )
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return( MBEDTLS_ERR_ASN1_INVALID_DATA );
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++( *p );
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return( 0 );
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}
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void mbedtls_asn1_sequence_free( mbedtls_asn1_sequence *seq )
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{
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while( seq != NULL )
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{
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mbedtls_asn1_sequence *next = seq->next;
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mbedtls_platform_zeroize( seq, sizeof( *seq ) );
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mbedtls_free( seq );
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seq = next;
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}
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}
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typedef struct
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{
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int tag;
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mbedtls_asn1_sequence *cur;
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} asn1_get_sequence_of_cb_ctx_t;
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static int asn1_get_sequence_of_cb( void *ctx,
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int tag,
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unsigned char *start,
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size_t len )
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{
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asn1_get_sequence_of_cb_ctx_t *cb_ctx =
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(asn1_get_sequence_of_cb_ctx_t *) ctx;
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mbedtls_asn1_sequence *cur =
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cb_ctx->cur;
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if( cur->buf.p != NULL )
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{
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cur->next =
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mbedtls_calloc( 1, sizeof( mbedtls_asn1_sequence ) );
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if( cur->next == NULL )
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return( MBEDTLS_ERR_ASN1_ALLOC_FAILED );
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cur = cur->next;
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}
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cur->buf.p = start;
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cur->buf.len = len;
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cur->buf.tag = tag;
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cb_ctx->cur = cur;
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return( 0 );
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}
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/*
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* Parses and splits an ASN.1 "SEQUENCE OF <tag>"
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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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{
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asn1_get_sequence_of_cb_ctx_t cb_ctx = { tag, cur };
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memset( cur, 0, sizeof( mbedtls_asn1_sequence ) );
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return( mbedtls_asn1_traverse_sequence_of(
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p, end, 0xFF, tag, 0, 0,
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asn1_get_sequence_of_cb, &cb_ctx ) );
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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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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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size_t len;
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if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
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MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
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return( ret );
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if( ( end - *p ) < 1 )
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return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
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alg->tag = **p;
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end = *p + len;
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if( ( ret = mbedtls_asn1_get_tag( p, end, &alg->len, MBEDTLS_ASN1_OID ) ) != 0 )
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return( ret );
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alg->p = *p;
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*p += alg->len;
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if( *p == end )
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{
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mbedtls_platform_zeroize( params, sizeof(mbedtls_asn1_buf) );
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return( 0 );
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}
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params->tag = **p;
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(*p)++;
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if( ( ret = mbedtls_asn1_get_len( p, end, ¶ms->len ) ) != 0 )
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return( ret );
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params->p = *p;
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*p += params->len;
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if( *p != end )
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return( MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
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return( 0 );
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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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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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mbedtls_asn1_buf params;
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memset( ¶ms, 0, sizeof(mbedtls_asn1_buf) );
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if( ( ret = mbedtls_asn1_get_alg( p, end, alg, ¶ms ) ) != 0 )
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return( ret );
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if( ( params.tag != MBEDTLS_ASN1_NULL && params.tag != 0 ) || params.len != 0 )
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return( MBEDTLS_ERR_ASN1_INVALID_DATA );
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return( 0 );
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}
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void mbedtls_asn1_free_named_data( mbedtls_asn1_named_data *cur )
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{
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if( cur == NULL )
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return;
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mbedtls_free( cur->oid.p );
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mbedtls_free( cur->val.p );
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mbedtls_platform_zeroize( cur, sizeof( mbedtls_asn1_named_data ) );
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}
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void mbedtls_asn1_free_named_data_list( mbedtls_asn1_named_data **head )
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{
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mbedtls_asn1_named_data *cur;
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while( ( cur = *head ) != NULL )
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{
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*head = cur->next;
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mbedtls_asn1_free_named_data( cur );
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mbedtls_free( cur );
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}
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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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while( list != NULL )
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{
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if( list->oid.len == len &&
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memcmp( list->oid.p, oid, len ) == 0 )
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{
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break;
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}
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list = list->next;
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}
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return( list );
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}
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#endif /* MBEDTLS_ASN1_PARSE_C */
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