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+.\" $OpenBSD: X509_get_extension_flags.3,v 1.1 2021/10/23 15:30:07 tb Exp $
+.\" full merge up to: OpenSSL 361136f4 Sep 1 18:56:58 2015 +0100
+.\" selective merge up to: OpenSSL 2b2e3106f Feb 16 15:04:45 2021 +0000
+.\"
+.\" This file was written by Dr. Stephen Henson <steve@openssl.org>.
+.\" Copyright (c) 2015 The OpenSSL Project.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\"
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\"
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in
+.\"    the documentation and/or other materials provided with the
+.\"    distribution.
+.\"
+.\" 3. All advertising materials mentioning features or use of this
+.\"    software must display the following acknowledgment:
+.\"    "This product includes software developed by the OpenSSL Project
+.\"    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
+.\"
+.\" 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
+.\"    endorse or promote products derived from this software without
+.\"    prior written permission. For written permission, please contact
+.\"    openssl-core@openssl.org.
+.\"
+.\" 5. Products derived from this software may not be called "OpenSSL"
+.\"    nor may "OpenSSL" appear in their names without prior written
+.\"    permission of the OpenSSL Project.
+.\"
+.\" 6. Redistributions of any form whatsoever must retain the following
+.\"    acknowledgment:
+.\"    "This product includes software developed by the OpenSSL Project
+.\"    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
+.\" EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
+.\" ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+.\" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+.\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+.\" STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+.\" OF THE POSSIBILITY OF SUCH DAMAGE.
+.\"
+.Dd $Mdocdate: October 23 2021 $
+.Dt X509_GET_EXTENSION_FLAGS 3
+.Os
+.Sh NAME
+.Nm X509_get_extension_flags ,
+.Nm X509_get_key_usage ,
+.Nm X509_get_extended_key_usage
+.Nd retrieve certificate extension data
+.Sh SYNOPSIS
+.In openssl/x509v3.h
+.Ft uint32_t
+.Fo X509_get_extension_flags
+.Fa "X509 *x"
+.Fc
+.Ft uint32_t
+.Fo X509_get_key_usage
+.Fa "X509 *x"
+.Fc
+.Ft uint32_t
+.Fo X509_get_extended_key_usage
+.Fa "X509 *x"
+.Fc
+.Sh DESCRIPTION
+These functions retrieve information related to commonly used
+certificate extensions.
+.Pp
+.Fn X509_get_extension_flags
+retrieves general information about a certificate, it will return one or
+more of the following flags ored together.
+.Bl -tag -width Ds
+.It Dv EXFLAG_V1
+The certificate is an obsolete version 1 certificate.
+.It Dv EXFLAG_BCONS
+The certificate contains a basic constraints extension.
+.It Dv EXFLAG_CA
+The certificate contains basic constraints and asserts the CA flag.
+.It Dv EXFLAG_PROXY
+The certificate is a valid proxy certificate.
+.It Dv EXFLAG_SI
+The certificate is self issued (that is subject and issuer names match).
+.It Dv EXFLAG_SS
+The subject and issuer names match and extension values imply it is self
+signed.
+.It Dv EXFLAG_FRESHEST
+The freshest CRL extension is present in the certificate.
+.It Dv EXFLAG_CRITICAL
+The certificate contains an unhandled critical extension.
+.It Dv EXFLAG_INVALID
+Some certificate extension values are invalid or inconsistent.
+The certificate should be rejected.
+This bit may also be raised after an out-of-memory error while
+processing the X509 object, so it may not be related to the processed
+ASN1 object itself.
+.\" EXFLAG_NO_FINGERPRINT is not available in LibreSSL. Do we need
+.\" https://github.com/openssl/openssl/issues/13698 and the fix it fixes?
+.\".It Dv EXFLAG_NO_FINGERPRINT
+.\" Failed to compute the internal SHA1 hash value of the certificate.
+.\" This may be due to malloc failure or because no SHA1 implementation was
+.\" found.
+.It Dv EXFLAG_INVALID_POLICY
+The
+.Dv NID_certificate_policies
+certificate extension is invalid or inconsistent.
+The certificate should be rejected.
+This bit may also be raised after an out-of-memory error while
+processing the X509 object, so it may not be related to the processed
+ASN1 object itself.
+.It Dv EXFLAG_KUSAGE
+The certificate contains a key usage extension.
+The value can be retrieved using
+.Fn X509_get_key_usage .
+.It Dv EXFLAG_XKUSAGE
+The certificate contains an extended key usage extension.
+The value can be retrieved using
+.Fn X509_get_extended_key_usage .
+.El
+.Pp
+.Fn X509_get_key_usage
+returns the value of the key usage extension.
+If key usage is present will return zero or more of the flags:
+.Dv KU_DIGITAL_SIGNATURE ,
+.Dv KU_NON_REPUDIATION ,
+.Dv KU_KEY_ENCIPHERMENT ,
+.Dv KU_DATA_ENCIPHERMENT ,
+.Dv KU_KEY_AGREEMENT ,
+.Dv KU_KEY_CERT_SIGN ,
+.Dv KU_CRL_SIGN ,
+.Dv KU_ENCIPHER_ONLY
+or
+.Dv KU_DECIPHER_ONLY
+corresponding to individual key usage bits.
+If key usage is absent then
+.Dv UINT32_MAX
+is returned.
+.Pp
+.Fn X509_get_extended_key_usage
+returns the value of the extended key usage extension.
+If extended key usage is present it will return zero or more of the
+flags:
+.Dv XKU_SSL_SERVER ,
+.Dv XKU_SSL_CLIENT ,
+.Dv XKU_SMIME ,
+.Dv XKU_CODE_SIGN
+.Dv XKU_OCSP_SIGN ,
+.Dv XKU_TIMESTAMP ,
+.Dv XKU_DVCS ,
+or
+.Dv XKU_ANYEKU .
+These correspond to the OIDs
+.Qq id-kp-serverAuth ,
+.Qq id-kp-clientAuth ,
+.Qq id-kp-emailProtection ,
+.Qq id-kp-codeSigning ,
+.Qq id-kp-OCSPSigning ,
+.Qq id-kp-timeStamping ,
+.Qq id-kp-dvcs ,
+and
+.Qq anyExtendedKeyUsage ,
+respectively.
+Additionally,
+.Dv XKU_SGC
+is set if either Netscape or Microsoft SGC OIDs are present.
+.Pp
+The value of the flags correspond to extension values which are cached
+in the
+.Vt X509
+structure.
+If the flags returned do not provide sufficient information,
+an application should examine extension values directly,
+for example using
+.Xr X509_get_ext_d2i 3 .
+.Pp
+If the key usage or extended key usage extension is absent then
+typically usage is unrestricted.
+For this reason
+.Fn X509_get_key_usage
+and
+.Fn X509_get_extended_key_usage
+return
+.Dv UINT32_MAX
+when the corresponding extension is absent.
+Applications can additionally check the return value of
+.Fn X509_get_extension_flags
+and take appropriate action if an extension is absent.
+.Sh RETURN VALUES
+.Fn X509_get_extension_flags ,
+.Fn X509_get_key_usage
+and
+.Fn X509_get_extended_key_usage
+return sets of flags corresponding to the certificate extension values.
+.Sh SEE ALSO
+.Xr X509_check_purpose 3 ,
+.Xr X509_get_ext_d2i 3
+.Sh HISTORY
+.Nm X509_get_extension_flags ,
+.Nm X509_get_key_usage ,
+and
+.Nm X509_get_extended_key_usage
+first appeared in OpenSSL 1.1.0 and have been available since
+.Ox 7.1 .