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79 lines
2.2 KiB
Plaintext
79 lines
2.2 KiB
Plaintext
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=pod
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=head1 NAME
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X509_check_purpose - Check the purpose of a certificate
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=head1 SYNOPSIS
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#include <openssl/x509v3.h>
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int X509_check_purpose(X509 *x, int id, int ca);
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=head1 DESCRIPTION
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This function checks if certificate I<x> was created with the purpose
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represented by I<id>. If I<ca> is nonzero, then certificate I<x> is
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checked to determine if it's a possible CA with various levels of certainty
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possibly returned. The certificate I<x> must be a complete certificate
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otherwise the function returns an error.
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Below are the potential ID's that can be checked:
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# define X509_PURPOSE_SSL_CLIENT 1
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# define X509_PURPOSE_SSL_SERVER 2
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# define X509_PURPOSE_NS_SSL_SERVER 3
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# define X509_PURPOSE_SMIME_SIGN 4
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# define X509_PURPOSE_SMIME_ENCRYPT 5
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# define X509_PURPOSE_CRL_SIGN 6
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# define X509_PURPOSE_ANY 7
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# define X509_PURPOSE_OCSP_HELPER 8
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# define X509_PURPOSE_TIMESTAMP_SIGN 9
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The checks performed take into account the X.509 extensions
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keyUsage, extendedKeyUsage, and basicConstraints.
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=head1 RETURN VALUES
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For non-CA checks
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=over 4
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=item -1 an error condition has occurred
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=item E<32>1 if the certificate was created to perform the purpose represented by I<id>
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=item E<32>0 if the certificate was not created to perform the purpose represented by I<id>
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=back
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For CA checks the below integers could be returned with the following meanings:
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=over 4
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=item -1 an error condition has occurred
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=item E<32>0 not a CA or does not have the purpose represented by I<id>
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=item E<32>1 is a CA.
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=item E<32>2 Only possible in old versions of openSSL when basicConstraints are absent.
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New versions will not return this value. May be a CA
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=item E<32>3 basicConstraints absent but self signed V1.
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=item E<32>4 basicConstraints absent but keyUsage present and keyCertSign asserted.
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=item E<32>5 legacy Netscape specific CA Flags present
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=back
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=head1 COPYRIGHT
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Copyright 2019-2021 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). You may not use this
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file except in compliance with the License. You can obtain a copy in the file
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LICENSE in the source distribution or at L<https://www.openssl.org/source/license.html>.
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=cut
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