mbed TLS library
Dependents: HTTPClient-SSL WS_SERVER
Diff: polarssl/x509_csr.c
- Revision:
- 0:137634ff4186
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/polarssl/x509_csr.c Thu Jun 11 03:27:03 2015 +0000 @@ -0,0 +1,466 @@ +/* + * X.509 Certificate Signing Request (CSR) parsing + * + * Copyright (C) 2006-2014, ARM Limited, All Rights Reserved + * + * This file is part of mbed TLS (https://tls.mbed.org) + * + * 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. + * + * 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. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ +/* + * 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(POLARSSL_CONFIG_FILE) +#include "polarssl/config.h" +#else +#include POLARSSL_CONFIG_FILE +#endif + +#if defined(POLARSSL_X509_CSR_PARSE_C) + +#include "polarssl/x509_csr.h" +#include "polarssl/oid.h" + +#include <string.h> + +#if defined(POLARSSL_PEM_PARSE_C) +#include "polarssl/pem.h" +#endif + +#if defined(POLARSSL_PLATFORM_C) +#include "polarssl/platform.h" +#else +#include <stdlib.h> +#include <stdio.h> +#define polarssl_free free +#define polarssl_malloc malloc +#define polarssl_snprintf snprintf +#endif + +#if defined(POLARSSL_FS_IO) || defined(EFIX64) || defined(EFI32) +#include <stdio.h> +#endif + +/* Implementation that should never be optimized out by the compiler */ +static void polarssl_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 = asn1_get_int( p, end, ver ) ) != 0 ) + { + if( ret == POLARSSL_ERR_ASN1_UNEXPECTED_TAG ) + { + *ver = 0; + return( 0 ); + } + + return( POLARSSL_ERR_X509_INVALID_VERSION + ret ); + } + + return( 0 ); +} + +/* + * Parse a CSR in DER format + */ +int x509_csr_parse_der( x509_csr *csr, + const unsigned char *buf, size_t buflen ) +{ + int ret; + size_t len; + unsigned char *p, *end; + x509_buf sig_params; + + memset( &sig_params, 0, sizeof( x509_buf ) ); + + /* + * Check for valid input + */ + if( csr == NULL || buf == NULL ) + return( POLARSSL_ERR_X509_BAD_INPUT_DATA ); + + x509_csr_init( csr ); + + /* + * first copy the raw DER data + */ + p = polarssl_malloc( len = buflen ); + + if( p == NULL ) + return( POLARSSL_ERR_X509_MALLOC_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 = asn1_get_tag( &p, end, &len, + ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 ) + { + x509_csr_free( csr ); + return( POLARSSL_ERR_X509_INVALID_FORMAT ); + } + + if( len != (size_t) ( end - p ) ) + { + x509_csr_free( csr ); + return( POLARSSL_ERR_X509_INVALID_FORMAT + + POLARSSL_ERR_ASN1_LENGTH_MISMATCH ); + } + + /* + * CertificationRequestInfo ::= SEQUENCE { + */ + csr->cri.p = p; + + if( ( ret = asn1_get_tag( &p, end, &len, + ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 ) + { + x509_csr_free( csr ); + return( POLARSSL_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 ) + { + x509_csr_free( csr ); + return( ret ); + } + + csr->version++; + + if( csr->version != 1 ) + { + x509_csr_free( csr ); + return( POLARSSL_ERR_X509_UNKNOWN_VERSION ); + } + + /* + * subject Name + */ + csr->subject_raw.p = p; + + if( ( ret = asn1_get_tag( &p, end, &len, + ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 ) + { + x509_csr_free( csr ); + return( POLARSSL_ERR_X509_INVALID_FORMAT + ret ); + } + + if( ( ret = x509_get_name( &p, p + len, &csr->subject ) ) != 0 ) + { + x509_csr_free( csr ); + return( ret ); + } + + csr->subject_raw.len = p - csr->subject_raw.p; + + /* + * subjectPKInfo SubjectPublicKeyInfo + */ + if( ( ret = pk_parse_subpubkey( &p, end, &csr->pk ) ) != 0 ) + { + x509_csr_free( csr ); + return( ret ); + } + + /* + * attributes [0] Attributes + */ + if( ( ret = asn1_get_tag( &p, end, &len, + ASN1_CONSTRUCTED | ASN1_CONTEXT_SPECIFIC ) ) != 0 ) + { + x509_csr_free( csr ); + return( POLARSSL_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 = x509_get_alg( &p, end, &csr->sig_oid, &sig_params ) ) != 0 ) + { + x509_csr_free( csr ); + return( ret ); + } + + if( ( ret = x509_get_sig_alg( &csr->sig_oid, &sig_params, + &csr->sig_md, &csr->sig_pk, + &csr->sig_opts ) ) != 0 ) + { + x509_csr_free( csr ); + return( POLARSSL_ERR_X509_UNKNOWN_SIG_ALG ); + } + + if( ( ret = x509_get_sig( &p, end, &csr->sig ) ) != 0 ) + { + x509_csr_free( csr ); + return( ret ); + } + + if( p != end ) + { + x509_csr_free( csr ); + return( POLARSSL_ERR_X509_INVALID_FORMAT + + POLARSSL_ERR_ASN1_LENGTH_MISMATCH ); + } + + return( 0 ); +} + +/* + * Parse a CSR, allowing for PEM or raw DER encoding + */ +int x509_csr_parse( x509_csr *csr, const unsigned char *buf, size_t buflen ) +{ + int ret; +#if defined(POLARSSL_PEM_PARSE_C) + size_t use_len; + pem_context pem; +#endif + + /* + * Check for valid input + */ + if( csr == NULL || buf == NULL ) + return( POLARSSL_ERR_X509_BAD_INPUT_DATA ); + +#if defined(POLARSSL_PEM_PARSE_C) + pem_init( &pem ); + ret = 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 = x509_csr_parse_der( csr, pem.buf, pem.buflen ) ) != 0 ) + return( ret ); + + pem_free( &pem ); + return( 0 ); + } + else if( ret != POLARSSL_ERR_PEM_NO_HEADER_FOOTER_PRESENT ) + { + pem_free( &pem ); + return( ret ); + } + else +#endif /* POLARSSL_PEM_PARSE_C */ + return( x509_csr_parse_der( csr, buf, buflen ) ); +} + +#if defined(POLARSSL_FS_IO) +/* + * Load a CSR into the structure + */ +int x509_csr_parse_file( x509_csr *csr, const char *path ) +{ + int ret; + size_t n; + unsigned char *buf; + + if( ( ret = pk_load_file( path, &buf, &n ) ) != 0 ) + return( ret ); + + ret = x509_csr_parse( csr, buf, n ); + + polarssl_zeroize( buf, n + 1 ); + polarssl_free( buf ); + + return( ret ); +} +#endif /* POLARSSL_FS_IO */ + +#if defined(_MSC_VER) && !defined snprintf && !defined(EFIX64) && \ + !defined(EFI32) +#include <stdarg.h> + +#if !defined vsnprintf +#define vsnprintf _vsnprintf +#endif // vsnprintf + +/* + * Windows _snprintf and _vsnprintf are not compatible to linux versions. + * Result value is not size of buffer needed, but -1 if no fit is possible. + * + * This fuction tries to 'fix' this by at least suggesting enlarging the + * size by 20. + */ +static int compat_snprintf( char *str, size_t size, const char *format, ... ) +{ + va_list ap; + int res = -1; + + va_start( ap, format ); + + res = vsnprintf( str, size, format, ap ); + + va_end( ap ); + + // No quick fix possible + if( res < 0 ) + return( (int) size + 20 ); + + return( res ); +} + +#define snprintf compat_snprintf +#endif /* _MSC_VER && !snprintf && !EFIX64 && !EFI32 */ + +#define POLARSSL_ERR_DEBUG_BUF_TOO_SMALL -2 + +#define SAFE_SNPRINTF() \ +{ \ + if( ret == -1 ) \ + return( -1 ); \ + \ + if( (unsigned int) ret > n ) { \ + p[n - 1] = '\0'; \ + return( POLARSSL_ERR_DEBUG_BUF_TOO_SMALL ); \ + } \ + \ + n -= (unsigned int) ret; \ + p += (unsigned int) ret; \ +} + +#define BEFORE_COLON 14 +#define BC "14" +/* + * Return an informational string about the CSR. + */ +int x509_csr_info( char *buf, size_t size, const char *prefix, + const x509_csr *csr ) +{ + int ret; + size_t n; + char *p; + char key_size_str[BEFORE_COLON]; + + p = buf; + n = size; + + ret = polarssl_snprintf( p, n, "%sCSR version : %d", + prefix, csr->version ); + SAFE_SNPRINTF(); + + ret = polarssl_snprintf( p, n, "\n%ssubject name : ", prefix ); + SAFE_SNPRINTF(); + ret = x509_dn_gets( p, n, &csr->subject ); + SAFE_SNPRINTF(); + + ret = polarssl_snprintf( p, n, "\n%ssigned using : ", prefix ); + SAFE_SNPRINTF(); + + ret = x509_sig_alg_gets( p, n, &csr->sig_oid, csr->sig_pk, csr->sig_md, + csr->sig_opts ); + SAFE_SNPRINTF(); + + if( ( ret = x509_key_size_helper( key_size_str, BEFORE_COLON, + pk_get_name( &csr->pk ) ) ) != 0 ) + { + return( ret ); + } + + ret = polarssl_snprintf( p, n, "\n%s%-" BC "s: %d bits\n", prefix, key_size_str, + (int) pk_get_size( &csr->pk ) ); + SAFE_SNPRINTF(); + + return( (int) ( size - n ) ); +} + +/* + * Initialize a CSR + */ +void x509_csr_init( x509_csr *csr ) +{ + memset( csr, 0, sizeof(x509_csr) ); +} + +/* + * Unallocate all CSR data + */ +void x509_csr_free( x509_csr *csr ) +{ + x509_name *name_cur; + x509_name *name_prv; + + if( csr == NULL ) + return; + + pk_free( &csr->pk ); + +#if defined(POLARSSL_X509_RSASSA_PSS_SUPPORT) + polarssl_free( csr->sig_opts ); +#endif + + name_cur = csr->subject.next; + while( name_cur != NULL ) + { + name_prv = name_cur; + name_cur = name_cur->next; + polarssl_zeroize( name_prv, sizeof( x509_name ) ); + polarssl_free( name_prv ); + } + + if( csr->raw.p != NULL ) + { + polarssl_zeroize( csr->raw.p, csr->raw.len ); + polarssl_free( csr->raw.p ); + } + + polarssl_zeroize( csr, sizeof( x509_csr ) ); +} + +#endif /* POLARSSL_X509_CSR_PARSE_C */ +