516 lines
19 KiB
C
516 lines
19 KiB
C
/**
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* \file x509_crt.h
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*
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* \brief X.509 certificate parsing and writing
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*
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* Copyright (C) 2006-2013, Brainspark B.V.
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*
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* This file is part of PolarSSL (http://www.polarssl.org)
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* Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
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*
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef POLARSSL_X509_CRT_H
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#define POLARSSL_X509_CRT_H
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#include "config.h"
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#include "x509.h"
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#include "x509_crl.h"
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/**
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* \addtogroup x509_module
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* \{
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*/
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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 Structures and functions for parsing and writing X.509 certificates
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* \{
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*/
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/**
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* Container for an X.509 certificate. The certificate may be chained.
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*/
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typedef struct _x509_crt
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{
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x509_buf raw; /**< The raw certificate data (DER). */
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x509_buf tbs; /**< The raw certificate body (DER). The part that is To Be Signed. */
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int version; /**< The X.509 version. (0=v1, 1=v2, 2=v3) */
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x509_buf serial; /**< Unique id for certificate issued by a specific CA. */
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x509_buf sig_oid1; /**< Signature algorithm, e.g. sha1RSA */
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x509_buf issuer_raw; /**< The raw issuer data (DER). Used for quick comparison. */
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x509_buf subject_raw; /**< The raw subject data (DER). Used for quick comparison. */
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x509_name issuer; /**< The parsed issuer data (named information object). */
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x509_name subject; /**< The parsed subject data (named information object). */
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x509_time valid_from; /**< Start time of certificate validity. */
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x509_time valid_to; /**< End time of certificate validity. */
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pk_context pk; /**< Container for the public key context. */
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x509_buf issuer_id; /**< Optional X.509 v2/v3 issuer unique identifier. */
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x509_buf subject_id; /**< Optional X.509 v2/v3 subject unique identifier. */
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x509_buf v3_ext; /**< Optional X.509 v3 extensions. Only Basic Contraints are supported at this time. */
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x509_sequence subject_alt_names; /**< Optional list of Subject Alternative Names (Only dNSName supported). */
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int ext_types; /**< Bit string containing detected and parsed extensions */
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int ca_istrue; /**< Optional Basic Constraint extension value: 1 if this certificate belongs to a CA, 0 otherwise. */
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int max_pathlen; /**< Optional Basic Constraint extension value: The maximum path length to the root certificate. Path length is 1 higher than RFC 5280 'meaning', so 1+ */
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unsigned char key_usage; /**< Optional key usage extension value: See the values below */
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x509_sequence ext_key_usage; /**< Optional list of extended key usage OIDs. */
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unsigned char ns_cert_type; /**< Optional Netscape certificate type extension value: See the values below */
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x509_buf sig_oid2; /**< Signature algorithm. Must match sig_oid1. */
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x509_buf sig; /**< Signature: hash of the tbs part signed with the private key. */
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md_type_t sig_md; /**< Internal representation of the MD algorithm of the signature algorithm, e.g. POLARSSL_MD_SHA256 */
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pk_type_t sig_pk /**< Internal representation of the Public Key algorithm of the signature algorithm, e.g. POLARSSL_PK_RSA */;
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struct _x509_crt *next; /**< Next certificate in the CA-chain. */
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}
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x509_crt;
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#define X509_CRT_VERSION_1 0
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#define X509_CRT_VERSION_2 1
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#define X509_CRT_VERSION_3 2
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#define X509_RFC5280_MAX_SERIAL_LEN 32
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#define X509_RFC5280_UTC_TIME_LEN 15
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/**
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* Container for writing a certificate (CRT)
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*/
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typedef struct _x509write_cert
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{
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int version;
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mpi serial;
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pk_context *subject_key;
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pk_context *issuer_key;
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asn1_named_data *subject;
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asn1_named_data *issuer;
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md_type_t md_alg;
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char not_before[X509_RFC5280_UTC_TIME_LEN + 1];
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char not_after[X509_RFC5280_UTC_TIME_LEN + 1];
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asn1_named_data *extensions;
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}
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x509write_cert;
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#if defined(POLARSSL_X509_CRT_PARSE_C)
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/**
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* \brief Parse a single DER formatted certificate and add it
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* to the chained list.
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*
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* \param chain points to the start of the chain
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* \param buf buffer holding the certificate DER data
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* \param buflen size of the buffer
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*
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* \return 0 if successful, or a specific X509 or PEM error code
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*/
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int x509_crt_parse_der( x509_crt *chain, const unsigned char *buf,
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size_t buflen );
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/**
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* \brief Parse one or more certificates and add them
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* to the chained list. Parses permissively. If some
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* certificates can be parsed, the result is the number
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* of failed certificates it encountered. If none complete
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* correctly, the first error is returned.
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*
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* \param chain points to the start of the chain
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* \param buf buffer holding the certificate data
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* \param buflen size of the buffer
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*
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* \return 0 if all certificates parsed successfully, a positive number
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* if partly successful or a specific X509 or PEM error code
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*/
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int x509_crt_parse( x509_crt *chain, const unsigned char *buf, size_t buflen );
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#if defined(POLARSSL_FS_IO)
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/**
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* \brief Load one or more certificates and add them
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* to the chained list. Parses permissively. If some
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* certificates can be parsed, the result is the number
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* of failed certificates it encountered. If none complete
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* correctly, the first error is returned.
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*
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* \param chain points to the start of the chain
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* \param path filename to read the certificates from
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*
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* \return 0 if all certificates parsed successfully, a positive number
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* if partly successful or a specific X509 or PEM error code
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*/
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int x509_crt_parse_file( x509_crt *chain, const char *path );
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/**
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* \brief Load one or more certificate files from a path and add them
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* to the chained list. Parses permissively. If some
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* certificates can be parsed, the result is the number
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* of failed certificates it encountered. If none complete
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* correctly, the first error is returned.
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*
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* \warning This function is NOT thread-safe unless
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* POLARSSL_THREADING_PTHREADS is defined. If you're using an
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* alternative threading implementation, you should either use
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* this function only in the main thread, or mutex it.
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*
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* \param chain points to the start of the chain
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* \param path directory / folder to read the certificate files from
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*
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* \return 0 if all certificates parsed successfully, a positive number
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* if partly successful or a specific X509 or PEM error code
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*/
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int x509_crt_parse_path( x509_crt *chain, const char *path );
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#endif /* POLARSSL_FS_IO */
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/**
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* \brief Returns an informational string about the
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* certificate.
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*
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* \param buf Buffer to write to
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* \param size Maximum size of buffer
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* \param prefix A line prefix
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* \param crt The X509 certificate to represent
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*
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* \return The amount of data written to the buffer, or -1 in
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* case of an error.
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*/
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int x509_crt_info( char *buf, size_t size, const char *prefix,
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const x509_crt *crt );
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/**
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* \brief Verify the certificate signature
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*
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* The verify callback is a user-supplied callback that
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* can clear / modify / add flags for a certificate. If set,
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* the verification callback is called for each
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* certificate in the chain (from the trust-ca down to the
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* presented crt). The parameters for the callback are:
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* (void *parameter, x509_crt *crt, int certificate_depth,
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* int *flags). With the flags representing current flags for
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* that specific certificate and the certificate depth from
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* the bottom (Peer cert depth = 0).
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*
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* All flags left after returning from the callback
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* are also returned to the application. The function should
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* return 0 for anything but a fatal error.
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*
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* \param crt a certificate to be verified
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* \param trust_ca the trusted CA chain
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* \param ca_crl the CRL chain for trusted CA's
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* \param cn expected Common Name (can be set to
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* NULL if the CN must not be verified)
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* \param flags result of the verification
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* \param f_vrfy verification function
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* \param p_vrfy verification parameter
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*
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* \return 0 if successful or POLARSSL_ERR_X509_SIG_VERIFY_FAILED,
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* in which case *flags will have one or more of
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* the following values set:
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* BADCERT_EXPIRED --
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* BADCERT_REVOKED --
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* BADCERT_CN_MISMATCH --
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* BADCERT_NOT_TRUSTED
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* or another error in case of a fatal error encountered
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* during the verification process.
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*/
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int x509_crt_verify( x509_crt *crt,
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x509_crt *trust_ca,
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x509_crl *ca_crl,
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const char *cn, int *flags,
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int (*f_vrfy)(void *, x509_crt *, int, int *),
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void *p_vrfy );
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#if defined(POLARSSL_X509_CRL_PARSE_C)
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/**
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* \brief Verify the certificate revocation status
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*
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* \param crt a certificate to be verified
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* \param crl the CRL to verify against
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*
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* \return 1 if the certificate is revoked, 0 otherwise
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*
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*/
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int x509_crt_revoked( const x509_crt *crt, const x509_crl *crl );
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#endif /* POLARSSL_X509_CRL_PARSE_C */
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/**
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* \brief Initialize a certificate (chain)
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*
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* \param crt Certificate chain to initialize
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*/
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void x509_crt_init( x509_crt *crt );
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/**
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* \brief Unallocate all certificate data
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*
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* \param crt Certificate chain to free
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*/
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void x509_crt_free( x509_crt *crt );
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#endif /* POLARSSL_X509_CRT_PARSE_C */
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/* \} name */
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/* \} addtogroup x509_module */
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#if defined(POLARSSL_X509_CRT_WRITE_C)
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/**
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* \brief Initialize a CRT writing context
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*
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* \param ctx CRT context to initialize
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*/
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void x509write_crt_init( x509write_cert *ctx );
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/**
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* \brief Set the verion for a Certificate
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* Default: X509_CRT_VERSION_3
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*
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* \param ctx CRT context to use
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* \param version version to set (X509_CRT_VERSION_1, X509_CRT_VERSION_2 or
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* X509_CRT_VERSION_3)
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*/
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void x509write_crt_set_version( x509write_cert *ctx, int version );
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/**
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* \brief Set the serial number for a Certificate.
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*
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* \param ctx CRT context to use
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* \param serial serial number to set
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*
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* \return 0 if successful
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*/
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int x509write_crt_set_serial( x509write_cert *ctx, const mpi *serial );
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/**
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* \brief Set the validity period for a Certificate
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* Timestamps should be in string format for UTC timezone
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* i.e. "YYYYMMDDhhmmss"
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* e.g. "20131231235959" for December 31st 2013
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* at 23:59:59
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*
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* \param ctx CRT context to use
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* \param not_before not_before timestamp
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* \param not_after not_after timestamp
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*
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* \return 0 if timestamp was parsed successfully, or
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* a specific error code
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*/
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int x509write_crt_set_validity( x509write_cert *ctx, const char *not_before,
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const char *not_after );
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/**
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* \brief Set the issuer name for a Certificate
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* Issuer names should contain a comma-separated list
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* of OID types and values:
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* e.g. "C=NL,O=Offspark,CN=PolarSSL CA"
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*
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* \param ctx CRT context to use
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* \param issuer_name issuer name to set
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*
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* \return 0 if issuer name was parsed successfully, or
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* a specific error code
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*/
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int x509write_crt_set_issuer_name( x509write_cert *ctx,
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const char *issuer_name );
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/**
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* \brief Set the subject name for a Certificate
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* Subject names should contain a comma-separated list
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* of OID types and values:
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* e.g. "C=NL,O=Offspark,CN=PolarSSL Server 1"
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*
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* \param ctx CRT context to use
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* \param subject_name subject name to set
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*
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* \return 0 if subject name was parsed successfully, or
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* a specific error code
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*/
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int x509write_crt_set_subject_name( x509write_cert *ctx,
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const char *subject_name );
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/**
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* \brief Set the subject public key for the certificate
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*
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* \param ctx CRT context to use
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* \param key public key to include
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*/
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void x509write_crt_set_subject_key( x509write_cert *ctx, pk_context *key );
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/**
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* \brief Set the issuer key used for signing the certificate
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*
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* \param ctx CRT context to use
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* \param key private key to sign with
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*/
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void x509write_crt_set_issuer_key( x509write_cert *ctx, pk_context *key );
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/**
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* \brief Set the MD algorithm to use for the signature
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* (e.g. POLARSSL_MD_SHA1)
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*
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* \param ctx CRT context to use
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* \param md_alg MD algorithm to use
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*/
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void x509write_crt_set_md_alg( x509write_cert *ctx, md_type_t md_alg );
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/**
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* \brief Generic function to add to or replace an extension in the
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* CRT
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*
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* \param ctx CRT context to use
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* \param oid OID of the extension
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* \param oid_len length of the OID
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* \param critical if the extension is critical (per the RFC's definition)
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* \param val value of the extension OCTET STRING
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* \param val_len length of the value data
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*
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* \return 0 if successful, or a POLARSSL_ERR_X509WRITE_MALLOC_FAILED
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*/
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int x509write_crt_set_extension( x509write_cert *ctx,
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const char *oid, size_t oid_len,
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int critical,
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const unsigned char *val, size_t val_len );
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/**
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* \brief Set the basicConstraints extension for a CRT
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*
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* \param ctx CRT context to use
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* \param is_ca is this a CA certificate
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* \param max_pathlen maximum length of certificate chains below this
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* certificate (only for CA certificates, -1 is
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* inlimited)
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*
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* \return 0 if successful, or a POLARSSL_ERR_X509WRITE_MALLOC_FAILED
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*/
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int x509write_crt_set_basic_constraints( x509write_cert *ctx,
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int is_ca, int max_pathlen );
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#if defined(POLARSSL_SHA1_C)
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/**
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* \brief Set the subjectKeyIdentifier extension for a CRT
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* Requires that x509write_crt_set_subject_key() has been
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* called before
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*
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* \param ctx CRT context to use
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*
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* \return 0 if successful, or a POLARSSL_ERR_X509WRITE_MALLOC_FAILED
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*/
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int x509write_crt_set_subject_key_identifier( x509write_cert *ctx );
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/**
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* \brief Set the authorityKeyIdentifier extension for a CRT
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* Requires that x509write_crt_set_issuer_key() has been
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* called before
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*
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* \param ctx CRT context to use
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*
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* \return 0 if successful, or a POLARSSL_ERR_X509WRITE_MALLOC_FAILED
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*/
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int x509write_crt_set_authority_key_identifier( x509write_cert *ctx );
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#endif /* POLARSSL_SHA1_C */
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/**
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* \brief Set the Key Usage Extension flags
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* (e.g. KU_DIGITAL_SIGNATURE | KU_KEY_CERT_SIGN)
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*
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* \param ctx CRT context to use
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* \param key_usage key usage flags to set
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*
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* \return 0 if successful, or POLARSSL_ERR_X509WRITE_MALLOC_FAILED
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*/
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int x509write_crt_set_key_usage( x509write_cert *ctx, unsigned char key_usage );
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/**
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* \brief Set the Netscape Cert Type flags
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* (e.g. NS_CERT_TYPE_SSL_CLIENT | NS_CERT_TYPE_EMAIL)
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*
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* \param ctx CRT context to use
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* \param ns_cert_type Netscape Cert Type flags to set
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*
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* \return 0 if successful, or POLARSSL_ERR_X509WRITE_MALLOC_FAILED
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*/
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int x509write_crt_set_ns_cert_type( x509write_cert *ctx,
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unsigned char ns_cert_type );
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/**
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* \brief Free the contents of a CRT write context
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*
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* \param ctx CRT context to free
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*/
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void x509write_crt_free( x509write_cert *ctx );
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/**
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* \brief Write a built up certificate to a X509 DER structure
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* Note: data is written at the end of the buffer! Use the
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* return value to determine where you should start
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* using the buffer
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*
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* \param ctx certificate to write away
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* \param buf buffer to write to
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* \param size size of the buffer
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* \param f_rng RNG function (for signature, see note)
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* \param p_rng RNG parameter
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*
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* \return length of data written if successful, or a specific
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* error code
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*
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* \note f_rng may be NULL if RSA is used for signature and the
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* signature is made offline (otherwise f_rng is desirable
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* for countermeasures against timing attacks).
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* ECDSA signatures always require a non-NULL f_rng.
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*/
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int x509write_crt_der( x509write_cert *ctx, unsigned char *buf, size_t size,
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int (*f_rng)(void *, unsigned char *, size_t),
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void *p_rng );
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#if defined(POLARSSL_PEM_WRITE_C)
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/**
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* \brief Write a built up certificate to a X509 PEM string
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*
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* \param ctx certificate to write away
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* \param buf buffer to write to
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* \param size size of the buffer
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* \param f_rng RNG function (for signature, see note)
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* \param p_rng RNG parameter
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*
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* \return 0 successful, or a specific error code
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*
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* \note f_rng may be NULL if RSA is used for signature and the
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* signature is made offline (otherwise f_rng is desirable
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* for countermeasures against timing attacks).
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* ECDSA signatures always require a non-NULL f_rng.
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*/
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int x509write_crt_pem( x509write_cert *ctx, unsigned char *buf, size_t size,
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int (*f_rng)(void *, unsigned char *, size_t),
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void *p_rng );
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#endif /* POLARSSL_PEM_WRITE_C */
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#endif /* POLARSSL_X509_CRT_WRITE_C */
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#ifdef __cplusplus
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}
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#endif
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#endif /* x509_crt.h */
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