Modified mbed TLS headers for AES functionality only to reduce build size
Dependents: BLE_Gateway_Linker_fix BLE_Gateway
Fork of mbedtls by
source/x509_csr.c
- Committer:
- Christopher Haster
- Date:
- 2016-01-22
- Revision:
- 1:24750b9ad5ef
File content as of revision 1:24750b9ad5ef:
/* * X.509 Certificate Signing Request (CSR) parsing * * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved * SPDX-License-Identifier: Apache-2.0 * * Licensed under the Apache License, Version 2.0 (the "License"); you may * not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * * This file is part of mbed TLS (https://tls.mbed.org) */ /* * The ITU-T X.509 standard defines a certificate format for PKI. * * http://www.ietf.org/rfc/rfc5280.txt (Certificates and CRLs) * http://www.ietf.org/rfc/rfc3279.txt (Alg IDs for CRLs) * http://www.ietf.org/rfc/rfc2986.txt (CSRs, aka PKCS#10) * * http://www.itu.int/ITU-T/studygroups/com17/languages/X.680-0207.pdf * http://www.itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf */ #if !defined(MBEDTLS_CONFIG_FILE) #include "mbedtls/config.h" #else #include MBEDTLS_CONFIG_FILE #endif #if defined(MBEDTLS_X509_CSR_PARSE_C) #include "mbedtls/x509_csr.h" #include "mbedtls/oid.h" #include <string.h> #if defined(MBEDTLS_PEM_PARSE_C) #include "mbedtls/pem.h" #endif #if defined(MBEDTLS_PLATFORM_C) #include "mbedtls/platform.h" #else #include <stdlib.h> #include <stdio.h> #define mbedtls_free free #define mbedtls_calloc calloc #define mbedtls_snprintf snprintf #endif #if defined(MBEDTLS_FS_IO) || defined(EFIX64) || defined(EFI32) #include <stdio.h> #endif /* Implementation that should never be optimized out by the compiler */ static void mbedtls_zeroize( void *v, size_t n ) { volatile unsigned char *p = v; while( n-- ) *p++ = 0; } /* * Version ::= INTEGER { v1(0) } */ static int x509_csr_get_version( unsigned char **p, const unsigned char *end, int *ver ) { int ret; if( ( ret = mbedtls_asn1_get_int( p, end, ver ) ) != 0 ) { if( ret == MBEDTLS_ERR_ASN1_UNEXPECTED_TAG ) { *ver = 0; return( 0 ); } return( MBEDTLS_ERR_X509_INVALID_VERSION + ret ); } return( 0 ); } /* * Parse a CSR in DER format */ int mbedtls_x509_csr_parse_der( mbedtls_x509_csr *csr, const unsigned char *buf, size_t buflen ) { int ret; size_t len; unsigned char *p, *end; mbedtls_x509_buf sig_params; memset( &sig_params, 0, sizeof( mbedtls_x509_buf ) ); /* * Check for valid input */ if( csr == NULL || buf == NULL ) return( MBEDTLS_ERR_X509_BAD_INPUT_DATA ); mbedtls_x509_csr_init( csr ); /* * first copy the raw DER data */ p = mbedtls_calloc( 1, len = buflen ); if( p == NULL ) return( MBEDTLS_ERR_X509_ALLOC_FAILED ); memcpy( p, buf, buflen ); csr->raw.p = p; csr->raw.len = len; end = p + len; /* * CertificationRequest ::= SEQUENCE { * certificationRequestInfo CertificationRequestInfo, * signatureAlgorithm AlgorithmIdentifier, * signature BIT STRING * } */ if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 ) { mbedtls_x509_csr_free( csr ); return( MBEDTLS_ERR_X509_INVALID_FORMAT ); } if( len != (size_t) ( end - p ) ) { mbedtls_x509_csr_free( csr ); return( MBEDTLS_ERR_X509_INVALID_FORMAT + MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ); } /* * CertificationRequestInfo ::= SEQUENCE { */ csr->cri.p = p; if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 ) { mbedtls_x509_csr_free( csr ); return( MBEDTLS_ERR_X509_INVALID_FORMAT + ret ); } end = p + len; csr->cri.len = end - csr->cri.p; /* * Version ::= INTEGER { v1(0) } */ if( ( ret = x509_csr_get_version( &p, end, &csr->version ) ) != 0 ) { mbedtls_x509_csr_free( csr ); return( ret ); } csr->version++; if( csr->version != 1 ) { mbedtls_x509_csr_free( csr ); return( MBEDTLS_ERR_X509_UNKNOWN_VERSION ); } /* * subject Name */ csr->subject_raw.p = p; if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 ) { mbedtls_x509_csr_free( csr ); return( MBEDTLS_ERR_X509_INVALID_FORMAT + ret ); } if( ( ret = mbedtls_x509_get_name( &p, p + len, &csr->subject ) ) != 0 ) { mbedtls_x509_csr_free( csr ); return( ret ); } csr->subject_raw.len = p - csr->subject_raw.p; /* * subjectPKInfo SubjectPublicKeyInfo */ if( ( ret = mbedtls_pk_parse_subpubkey( &p, end, &csr->pk ) ) != 0 ) { mbedtls_x509_csr_free( csr ); return( ret ); } /* * attributes [0] Attributes */ if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_CONTEXT_SPECIFIC ) ) != 0 ) { mbedtls_x509_csr_free( csr ); return( MBEDTLS_ERR_X509_INVALID_FORMAT + ret ); } // TODO Parse Attributes / extension requests p += len; end = csr->raw.p + csr->raw.len; /* * signatureAlgorithm AlgorithmIdentifier, * signature BIT STRING */ if( ( ret = mbedtls_x509_get_alg( &p, end, &csr->sig_oid, &sig_params ) ) != 0 ) { mbedtls_x509_csr_free( csr ); return( ret ); } if( ( ret = mbedtls_x509_get_sig_alg( &csr->sig_oid, &sig_params, &csr->sig_md, &csr->sig_pk, &csr->sig_opts ) ) != 0 ) { mbedtls_x509_csr_free( csr ); return( MBEDTLS_ERR_X509_UNKNOWN_SIG_ALG ); } if( ( ret = mbedtls_x509_get_sig( &p, end, &csr->sig ) ) != 0 ) { mbedtls_x509_csr_free( csr ); return( ret ); } if( p != end ) { mbedtls_x509_csr_free( csr ); return( MBEDTLS_ERR_X509_INVALID_FORMAT + MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ); } return( 0 ); } /* * Parse a CSR, allowing for PEM or raw DER encoding */ int mbedtls_x509_csr_parse( mbedtls_x509_csr *csr, const unsigned char *buf, size_t buflen ) { int ret; #if defined(MBEDTLS_PEM_PARSE_C) size_t use_len; mbedtls_pem_context pem; #endif /* * Check for valid input */ if( csr == NULL || buf == NULL ) return( MBEDTLS_ERR_X509_BAD_INPUT_DATA ); #if defined(MBEDTLS_PEM_PARSE_C) mbedtls_pem_init( &pem ); /* Avoid calling mbedtls_pem_read_buffer() on non-null-terminated string */ if( buflen == 0 || buf[buflen - 1] != '\0' ) ret = MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT; else ret = mbedtls_pem_read_buffer( &pem, "-----BEGIN CERTIFICATE REQUEST-----", "-----END CERTIFICATE REQUEST-----", buf, NULL, 0, &use_len ); if( ret == 0 ) { /* * Was PEM encoded, parse the result */ if( ( ret = mbedtls_x509_csr_parse_der( csr, pem.buf, pem.buflen ) ) != 0 ) return( ret ); mbedtls_pem_free( &pem ); return( 0 ); } else if( ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT ) { mbedtls_pem_free( &pem ); return( ret ); } else #endif /* MBEDTLS_PEM_PARSE_C */ return( mbedtls_x509_csr_parse_der( csr, buf, buflen ) ); } #if defined(MBEDTLS_FS_IO) /* * Load a CSR into the structure */ int mbedtls_x509_csr_parse_file( mbedtls_x509_csr *csr, const char *path ) { int ret; size_t n; unsigned char *buf; if( ( ret = mbedtls_pk_load_file( path, &buf, &n ) ) != 0 ) return( ret ); ret = mbedtls_x509_csr_parse( csr, buf, n ); mbedtls_zeroize( buf, n ); mbedtls_free( buf ); return( ret ); } #endif /* MBEDTLS_FS_IO */ #define BEFORE_COLON 14 #define BC "14" /* * Return an informational string about the CSR. */ int mbedtls_x509_csr_info( char *buf, size_t size, const char *prefix, const mbedtls_x509_csr *csr ) { int ret; size_t n; char *p; char key_size_str[BEFORE_COLON]; p = buf; n = size; ret = mbedtls_snprintf( p, n, "%sCSR version : %d", prefix, csr->version ); MBEDTLS_X509_SAFE_SNPRINTF; ret = mbedtls_snprintf( p, n, "\n%ssubject name : ", prefix ); MBEDTLS_X509_SAFE_SNPRINTF; ret = mbedtls_x509_dn_gets( p, n, &csr->subject ); MBEDTLS_X509_SAFE_SNPRINTF; ret = mbedtls_snprintf( p, n, "\n%ssigned using : ", prefix ); MBEDTLS_X509_SAFE_SNPRINTF; ret = mbedtls_x509_sig_alg_gets( p, n, &csr->sig_oid, csr->sig_pk, csr->sig_md, csr->sig_opts ); MBEDTLS_X509_SAFE_SNPRINTF; if( ( ret = mbedtls_x509_key_size_helper( key_size_str, BEFORE_COLON, mbedtls_pk_get_name( &csr->pk ) ) ) != 0 ) { return( ret ); } ret = mbedtls_snprintf( p, n, "\n%s%-" BC "s: %d bits\n", prefix, key_size_str, (int) mbedtls_pk_get_bitlen( &csr->pk ) ); MBEDTLS_X509_SAFE_SNPRINTF; return( (int) ( size - n ) ); } /* * Initialize a CSR */ void mbedtls_x509_csr_init( mbedtls_x509_csr *csr ) { memset( csr, 0, sizeof(mbedtls_x509_csr) ); } /* * Unallocate all CSR data */ void mbedtls_x509_csr_free( mbedtls_x509_csr *csr ) { mbedtls_x509_name *name_cur; mbedtls_x509_name *name_prv; if( csr == NULL ) return; mbedtls_pk_free( &csr->pk ); #if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT) mbedtls_free( csr->sig_opts ); #endif name_cur = csr->subject.next; while( name_cur != NULL ) { name_prv = name_cur; name_cur = name_cur->next; mbedtls_zeroize( name_prv, sizeof( mbedtls_x509_name ) ); mbedtls_free( name_prv ); } if( csr->raw.p != NULL ) { mbedtls_zeroize( csr->raw.p, csr->raw.len ); mbedtls_free( csr->raw.p ); } mbedtls_zeroize( csr, sizeof( mbedtls_x509_csr ) ); } #endif /* MBEDTLS_X509_CSR_PARSE_C */