670 lines
24 KiB
C
670 lines
24 KiB
C
/**
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* \file x509.h
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*
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* \brief X.509 certificate and private key decoding
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*
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* Copyright (C) 2006-2011, 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_H
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#define POLARSSL_X509_H
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#include "config.h"
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#if defined(POLARSSL_X509_PARSE_C) || defined(POLARSSL_X509_WRITE_C)
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#include "asn1.h"
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#include "rsa.h"
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#include "dhm.h"
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#include "md.h"
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#include "pk.h"
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/**
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* \addtogroup x509_module
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* \{
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*/
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/**
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* \name X509 Error codes
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* \{
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*/
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#define POLARSSL_ERR_X509_FEATURE_UNAVAILABLE -0x2080 /**< Unavailable feature, e.g. RSA hashing/encryption combination. */
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#define POLARSSL_ERR_X509_CERT_INVALID_PEM -0x2100 /**< The PEM-encoded certificate contains invalid elements, e.g. invalid character. */
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#define POLARSSL_ERR_X509_CERT_INVALID_FORMAT -0x2180 /**< The certificate format is invalid, e.g. different type expected. */
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#define POLARSSL_ERR_X509_CERT_INVALID_VERSION -0x2200 /**< The certificate version element is invalid. */
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#define POLARSSL_ERR_X509_CERT_INVALID_SERIAL -0x2280 /**< The serial tag or value is invalid. */
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#define POLARSSL_ERR_X509_CERT_INVALID_ALG -0x2300 /**< The algorithm tag or value is invalid. */
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#define POLARSSL_ERR_X509_CERT_INVALID_NAME -0x2380 /**< The name tag or value is invalid. */
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#define POLARSSL_ERR_X509_CERT_INVALID_DATE -0x2400 /**< The date tag or value is invalid. */
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#define POLARSSL_ERR_X509_CERT_INVALID_PUBKEY -0x2480 /**< The pubkey tag or value is invalid (only RSA is supported). */
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#define POLARSSL_ERR_X509_CERT_INVALID_SIGNATURE -0x2500 /**< The signature tag or value invalid. */
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#define POLARSSL_ERR_X509_CERT_INVALID_EXTENSIONS -0x2580 /**< The extension tag or value is invalid. */
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#define POLARSSL_ERR_X509_CERT_UNKNOWN_VERSION -0x2600 /**< Certificate or CRL has an unsupported version number. */
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#define POLARSSL_ERR_X509_CERT_UNKNOWN_SIG_ALG -0x2680 /**< Signature algorithm (oid) is unsupported. */
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#define POLARSSL_ERR_X509_UNKNOWN_PK_ALG -0x2700 /**< Key algorithm is unsupported (only RSA is supported). */
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#define POLARSSL_ERR_X509_CERT_SIG_MISMATCH -0x2780 /**< Certificate signature algorithms do not match. (see \c ::x509_cert sig_oid) */
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#define POLARSSL_ERR_X509_CERT_VERIFY_FAILED -0x2800 /**< Certificate verification failed, e.g. CRL, CA or signature check failed. */
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#define POLARSSL_ERR_X509_KEY_INVALID_VERSION -0x2880 /**< Unsupported RSA key version */
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#define POLARSSL_ERR_X509_KEY_INVALID_FORMAT -0x2900 /**< Invalid RSA key tag or value. */
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#define POLARSSL_ERR_X509_CERT_UNKNOWN_FORMAT -0x2980 /**< Format not recognized as DER or PEM. */
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#define POLARSSL_ERR_X509_INVALID_INPUT -0x2A00 /**< Input invalid. */
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#define POLARSSL_ERR_X509_MALLOC_FAILED -0x2A80 /**< Allocation of memory failed. */
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#define POLARSSL_ERR_X509_FILE_IO_ERROR -0x2B00 /**< Read/write of file failed. */
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/* \} name */
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/**
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* \name X509 Verify codes
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* \{
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*/
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#define BADCERT_EXPIRED 0x01 /**< The certificate validity has expired. */
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#define BADCERT_REVOKED 0x02 /**< The certificate has been revoked (is on a CRL). */
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#define BADCERT_CN_MISMATCH 0x04 /**< The certificate Common Name (CN) does not match with the expected CN. */
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#define BADCERT_NOT_TRUSTED 0x08 /**< The certificate is not correctly signed by the trusted CA. */
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#define BADCRL_NOT_TRUSTED 0x10 /**< CRL is not correctly signed by the trusted CA. */
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#define BADCRL_EXPIRED 0x20 /**< CRL is expired. */
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#define BADCERT_MISSING 0x40 /**< Certificate was missing. */
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#define BADCERT_SKIP_VERIFY 0x80 /**< Certificate verification was skipped. */
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#define BADCERT_OTHER 0x0100 /**< Other reason (can be used by verify callback) */
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/* \} name */
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/* \} addtogroup x509_module */
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/*
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* X.509 v3 Key Usage Extension flags
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*/
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#define KU_DIGITAL_SIGNATURE (0x80) /* bit 0 */
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#define KU_NON_REPUDIATION (0x40) /* bit 1 */
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#define KU_KEY_ENCIPHERMENT (0x20) /* bit 2 */
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#define KU_DATA_ENCIPHERMENT (0x10) /* bit 3 */
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#define KU_KEY_AGREEMENT (0x08) /* bit 4 */
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#define KU_KEY_CERT_SIGN (0x04) /* bit 5 */
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#define KU_CRL_SIGN (0x02) /* bit 6 */
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/*
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* Netscape certificate types
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* (http://www.mozilla.org/projects/security/pki/nss/tech-notes/tn3.html)
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*/
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#define NS_CERT_TYPE_SSL_CLIENT (0x80) /* bit 0 */
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#define NS_CERT_TYPE_SSL_SERVER (0x40) /* bit 1 */
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#define NS_CERT_TYPE_EMAIL (0x20) /* bit 2 */
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#define NS_CERT_TYPE_OBJECT_SIGNING (0x10) /* bit 3 */
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#define NS_CERT_TYPE_RESERVED (0x08) /* bit 4 */
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#define NS_CERT_TYPE_SSL_CA (0x04) /* bit 5 */
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#define NS_CERT_TYPE_EMAIL_CA (0x02) /* bit 6 */
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#define NS_CERT_TYPE_OBJECT_SIGNING_CA (0x01) /* bit 7 */
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/*
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* X.509 extension types
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*/
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#define EXT_AUTHORITY_KEY_IDENTIFIER (1 << 0)
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#define EXT_SUBJECT_KEY_IDENTIFIER (1 << 1)
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#define EXT_KEY_USAGE (1 << 2)
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#define EXT_CERTIFICATE_POLICIES (1 << 3)
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#define EXT_POLICY_MAPPINGS (1 << 4)
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#define EXT_SUBJECT_ALT_NAME (1 << 5)
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#define EXT_ISSUER_ALT_NAME (1 << 6)
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#define EXT_SUBJECT_DIRECTORY_ATTRS (1 << 7)
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#define EXT_BASIC_CONSTRAINTS (1 << 8)
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#define EXT_NAME_CONSTRAINTS (1 << 9)
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#define EXT_POLICY_CONSTRAINTS (1 << 10)
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#define EXT_EXTENDED_KEY_USAGE (1 << 11)
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#define EXT_CRL_DISTRIBUTION_POINTS (1 << 12)
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#define EXT_INIHIBIT_ANYPOLICY (1 << 13)
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#define EXT_FRESHEST_CRL (1 << 14)
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#define EXT_NS_CERT_TYPE (1 << 16)
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/*
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* Storage format identifiers
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* Recognized formats: PEM and DER
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*/
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#define X509_FORMAT_DER 1
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#define X509_FORMAT_PEM 2
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/**
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* \addtogroup x509_module
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* \{ */
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/**
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* \name Structures for parsing X.509 certificates and CRLs
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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 asn1_buf x509_buf;
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/**
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* Container for ASN1 bit strings.
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*/
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typedef asn1_bitstring x509_bitstring;
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/**
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* Container for ASN1 named information objects.
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* It allows for Relative Distinguished Names (e.g. cn=polarssl,ou=code,etc.).
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*/
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typedef struct _x509_name
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{
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x509_buf oid; /**< The object identifier. */
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x509_buf val; /**< The named value. */
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struct _x509_name *next; /**< The next named information object. */
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}
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x509_name;
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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 asn1_sequence x509_sequence;
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/** Container for date and time (precision in seconds). */
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typedef struct _x509_time
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{
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int year, mon, day; /**< Date. */
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int hour, min, sec; /**< Time. */
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}
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x509_time;
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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_cert
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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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x509_buf pk_oid; /**< Subject public key info. Includes the public key algorithm and the key itself. */
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rsa_context rsa; /**< Container for the RSA context. Only RSA is supported for public keys at this time. */
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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_cert *next; /**< Next certificate in the CA-chain. */
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}
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x509_cert;
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/**
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* Certificate revocation list entry.
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* Contains the CA-specific serial numbers and revocation dates.
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*/
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typedef struct _x509_crl_entry
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{
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x509_buf raw;
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x509_buf serial;
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x509_time revocation_date;
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x509_buf entry_ext;
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struct _x509_crl_entry *next;
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}
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x509_crl_entry;
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/**
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* Certificate revocation list structure.
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* Every CRL may have multiple entries.
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*/
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typedef struct _x509_crl
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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;
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x509_buf sig_oid1;
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x509_buf issuer_raw; /**< The raw issuer data (DER). */
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x509_name issuer; /**< The parsed issuer data (named information object). */
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x509_time this_update;
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x509_time next_update;
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x509_crl_entry entry; /**< The CRL entries containing the certificate revocation times for this CA. */
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x509_buf crl_ext;
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x509_buf sig_oid2;
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x509_buf sig;
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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_crl *next;
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}
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x509_crl;
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/** \} name Structures for parsing X.509 certificates and CRLs */
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/** \} addtogroup x509_module */
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/**
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* \name Structures for writing X.509 certificates.
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* XvP: commented out as they are not used.
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* - <tt>typedef struct _x509_node x509_node;</tt>
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* - <tt>typedef struct _x509_raw x509_raw;</tt>
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*/
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/*
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typedef struct _x509_node
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{
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unsigned char *data;
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unsigned char *p;
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unsigned char *end;
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size_t len;
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}
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x509_node;
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typedef struct _x509_raw
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{
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x509_node raw;
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x509_node tbs;
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x509_node version;
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x509_node serial;
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x509_node tbs_signalg;
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x509_node issuer;
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x509_node validity;
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x509_node subject;
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x509_node subpubkey;
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x509_node signalg;
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x509_node sign;
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}
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x509_raw;
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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 Functions to read in DHM parameters, a certificate, CRL or private RSA key
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* \{
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*/
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/** \ingroup x509_module */
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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 x509parse_crt( x509_cert *chain, const unsigned char *buf, size_t buflen );
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/** \ingroup x509_module */
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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 x509parse_crtfile( x509_cert *chain, const char *path );
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/** \ingroup x509_module */
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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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* \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 x509parse_crtpath( x509_cert *chain, const char *path );
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/** \ingroup x509_module */
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/**
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* \brief Parse one or more CRLs and add them
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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 CRL 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 x509parse_crl( x509_crl *chain, const unsigned char *buf, size_t buflen );
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/** \ingroup x509_module */
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/**
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* \brief Load one or more CRLs and add them
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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 path filename to read the CRLs from
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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 x509parse_crlfile( x509_crl *chain, const char *path );
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/** \ingroup x509_module */
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/**
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* \brief Parse a private RSA key
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*
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* \param rsa RSA context to be initialized
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* \param key input buffer
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* \param keylen size of the buffer
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* \param pwd password for decryption (optional)
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* \param pwdlen size of the password
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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 x509parse_key( rsa_context *rsa,
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const unsigned char *key, size_t keylen,
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const unsigned char *pwd, size_t pwdlen );
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/** \ingroup x509_module */
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/**
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* \brief Load and parse a private RSA key
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*
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* \param rsa RSA context to be initialized
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* \param path filename to read the private key from
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* \param password password to decrypt the file (can be NULL)
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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 x509parse_keyfile( rsa_context *rsa, const char *path,
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const char *password );
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/** \ingroup x509_module */
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/**
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* \brief Parse a public RSA key
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*
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* \param rsa RSA context to be initialized
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* \param key input buffer
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* \param keylen 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 x509parse_public_key( rsa_context *rsa,
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const unsigned char *key, size_t keylen );
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/** \ingroup x509_module */
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/**
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* \brief Load and parse a public RSA key
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*
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* \param rsa RSA context to be initialized
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* \param path filename to read the private key from
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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 x509parse_public_keyfile( rsa_context *rsa, const char *path );
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/** \ingroup x509_module */
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/**
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* \brief Parse DHM parameters
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*
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* \param dhm DHM context to be initialized
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* \param dhmin input buffer
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* \param dhminlen 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 x509parse_dhm( dhm_context *dhm, const unsigned char *dhmin, size_t dhminlen );
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/** \ingroup x509_module */
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/**
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* \brief Load and parse DHM parameters
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*
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* \param dhm DHM context to be initialized
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* \param path filename to read the DHM Parameters from
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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 x509parse_dhmfile( dhm_context *dhm, const char *path );
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/** \} name Functions to read in DHM parameters, a certificate, CRL or private RSA key */
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/**
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* \brief Store the certificate DN in printable form into buf;
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* no more than size characters will be written.
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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 dn The X509 name 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 x509parse_dn_gets( char *buf, size_t size, const x509_name *dn );
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/**
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* \brief Store the certificate serial in printable form into buf;
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* no more than size characters will be written.
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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 serial The X509 serial 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 x509parse_serial_gets( char *buf, size_t size, const x509_buf *serial );
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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 x509parse_cert_info( char *buf, size_t size, const char *prefix,
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const x509_cert *crt );
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/**
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* \brief Returns an informational string about the
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* CRL.
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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 crl The X509 CRL to represent
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*
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* \return The amount of data written to the buffer, or -1 in
|
|
* case of an error.
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|
*/
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int x509parse_crl_info( char *buf, size_t size, const char *prefix,
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const x509_crl *crl );
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/**
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* \brief Give an known OID, return its descriptive string.
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*
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* \param oid buffer containing the oid
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*
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* \return Return a string if the OID is known,
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* or NULL otherwise.
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*/
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const char *x509_oid_get_description( x509_buf *oid );
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|
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/**
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* \brief Give an OID, return a string version of its OID number.
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* (Deprecated. Use oid_get_numeric_string() instead)
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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 oid Buffer containing the OID
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|
*
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|
* \return The amount of data written to the buffer, or -1 in
|
|
* case of an error.
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|
*/
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int x509_oid_get_numeric_string( char *buf, size_t size, x509_buf *oid );
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|
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/**
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|
* \brief Check a given x509_time against the system time and check
|
|
* if it is valid.
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|
*
|
|
* \param time x509_time to check
|
|
*
|
|
* \return Return 0 if the x509_time is still valid,
|
|
* or 1 otherwise.
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|
*/
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|
int x509parse_time_expired( const x509_time *time );
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|
|
|
/**
|
|
* \name Functions to verify a certificate
|
|
* \{
|
|
*/
|
|
/** \ingroup x509_module */
|
|
/**
|
|
* \brief Verify the certificate signature
|
|
*
|
|
* The verify callback is a user-supplied callback that
|
|
* can clear / modify / add flags for a certificate. If set,
|
|
* the verification callback is called for each
|
|
* certificate in the chain (from the trust-ca down to the
|
|
* presented crt). The parameters for the callback are:
|
|
* (void *parameter, x509_cert *crt, int certificate_depth,
|
|
* int *flags). With the flags representing current flags for
|
|
* that specific certificate and the certificate depth from
|
|
* the bottom (Peer cert depth = 0).
|
|
*
|
|
* All flags left after returning from the callback
|
|
* are also returned to the application. The function should
|
|
* return 0 for anything but a fatal error.
|
|
*
|
|
* \param crt a certificate to be verified
|
|
* \param trust_ca the trusted CA chain
|
|
* \param ca_crl the CRL chain for trusted CA's
|
|
* \param cn expected Common Name (can be set to
|
|
* NULL if the CN must not be verified)
|
|
* \param flags result of the verification
|
|
* \param f_vrfy verification function
|
|
* \param p_vrfy verification parameter
|
|
*
|
|
* \return 0 if successful or POLARSSL_ERR_X509_SIG_VERIFY_FAILED,
|
|
* in which case *flags will have one or more of
|
|
* the following values set:
|
|
* BADCERT_EXPIRED --
|
|
* BADCERT_REVOKED --
|
|
* BADCERT_CN_MISMATCH --
|
|
* BADCERT_NOT_TRUSTED
|
|
* or another error in case of a fatal error encountered
|
|
* during the verification process.
|
|
*/
|
|
int x509parse_verify( x509_cert *crt,
|
|
x509_cert *trust_ca,
|
|
x509_crl *ca_crl,
|
|
const char *cn, int *flags,
|
|
int (*f_vrfy)(void *, x509_cert *, int, int *),
|
|
void *p_vrfy );
|
|
|
|
/**
|
|
* \brief Verify the certificate signature
|
|
*
|
|
* \param crt a certificate to be verified
|
|
* \param crl the CRL to verify against
|
|
*
|
|
* \return 1 if the certificate is revoked, 0 otherwise
|
|
*
|
|
*/
|
|
int x509parse_revoked( const x509_cert *crt, const x509_crl *crl );
|
|
|
|
/** \} name Functions to verify a certificate */
|
|
|
|
|
|
|
|
/**
|
|
* \name Functions to clear a certificate, CRL or private RSA key
|
|
* \{
|
|
*/
|
|
/** \ingroup x509_module */
|
|
/**
|
|
* \brief Unallocate all certificate data
|
|
*
|
|
* \param crt Certificate chain to free
|
|
*/
|
|
void x509_free( x509_cert *crt );
|
|
|
|
/** \ingroup x509_module */
|
|
/**
|
|
* \brief Unallocate all CRL data
|
|
*
|
|
* \param crl CRL chain to free
|
|
*/
|
|
void x509_crl_free( x509_crl *crl );
|
|
|
|
/** \} name Functions to clear a certificate, CRL or private RSA key */
|
|
|
|
|
|
/**
|
|
* \brief Checkup routine
|
|
*
|
|
* \return 0 if successful, or 1 if the test failed
|
|
*/
|
|
int x509_self_test( int verbose );
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* POLARSSL_X509_PARSE_C || POLARSSL_X509_WRITE_C */
|
|
#endif /* x509.h */
|