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-.\" $OpenBSD: X509_policy_check.3,v 1.6 2021/11/11 12:06:25 schwarze Exp $
-.\"
-.\" Copyright (c) 2021 Ingo Schwarze <schwarze@openbsd.org>
-.\"
-.\" Permission to use, copy, modify, and distribute this software for any
-.\" purpose with or without fee is hereby granted, provided that the above
-.\" copyright notice and this permission notice appear in all copies.
-.\"
-.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
-.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
-.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
-.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
-.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
-.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
-.\"
-.Dd $Mdocdate: November 11 2021 $
-.Dt X509_POLICY_CHECK 3
-.Os
-.Sh NAME
-.Nm X509_policy_check ,
-.Nm X509_policy_tree_free
-.Nd construct X.509 valid policy tree
-.Sh SYNOPSIS
-.In openssl/x509_vfy.h
-.Ft int
-.Fo X509_policy_check
-.Fa "X509_POLICY_TREE **ptree"
-.Fa "int *pexplicit_policy"
-.Fa "STACK_OF(X509) *certs"
-.Fa "STACK_OF(ASN1_OBJECT) *policy_oids"
-.Fa "unsigned int flags"
-.Fc
-.Ft void
-.Fn X509_policy_tree_free "X509_POLICY_TREE *tree"
-.Sh DESCRIPTION
-.Fn X509_policy_check
-performs those parts of Basic Certification Path Validation
-described in RFC 5280 section 6.1 that are related to the
-construction of the valid policy tree.
-.Pp
-The
-.Fa certs
-input argument contains the prospective certification path
-according to RFC 5280 paragraph 6.1.1(a), starting with the
-target certificate and ending with the trust anchor.
-.Pp
-The
-.Fa policy_oids
-input argument contains the
-.Va user-initial-policy-set
-according to RFC 5280 section 6.1.1(c).
-It specifies a set of certificate policies acceptable to the certificate user.
-.Pp
-The
-.Fa flags
-argument can contain zero or more of the following constants, OR'ed together:
-.Bl -tag -width Ds
-.It Dv X509_V_FLAG_EXPLICIT_POLICY
-Set
-.Va initial-explicit-policy
-as defined by RFC 5280 paragraph 6.1.1(f).
-It requires the path to be valid for at least one of the
-.Fa policy_oids .
-.It Dv X509_V_FLAG_INHIBIT_ANY
-Set
-.Va initial-any-policy-inhibit
-as defined by RFC 5280 paragraph 6.1.1(g).
-It causes the
-.Sy anyPolicy
-OID to be skipped if it is encountered in a certificate.
-.It Dv X509_V_FLAG_INHIBIT_MAP
-Set
-.Va initial-policy-mapping-inhibit
-as defined by RFC 5280 paragraph 6.1.1(e).
-It disables policy mapping in the certification path.
-.El
-.Pp
-Upon success and in some cases of failure, the storage location pointed to by
-.Fa pexplicit_policy
-is set to 1 if
-.Dv X509_V_FLAG_EXPLICIT_POLICY
-was requested.
-Otherwise, it is set to 0.
-.Pp
-In many cases of success and in a few cases of failure, a pointer to the
-.Vt valid_policy_tree
-output value mentioned in RFC 5280 section 6.1.6 is returned in
-.Pf * Fa ptree .
-It contains one level for each of the
-.Fa certs ,
-in reverse order: level 0 corresponds to the trust anchor,
-the last level corresponds to the target certificate.
-Level 0 is initialized to contain a single node with a
-.Fa valid_policy
-of
-.Sy anyPolicy
-and an empty
-.Fa qualifier_set .
-.Pp
-If a policy tree is returned, the reference count of each of the
-.Fa certs
-is incremented by 1.
-In that case, the caller is responsible for calling
-.Fn X509_policy_tree_free
-to release all memory used by the
-.Fa tree
-and to decrement the reference counts
-of the certificates referenced from it by 1.
-If
-.Fa tree
-is a
-.Dv NULL
-pointer,
-.Fn X509_policy_tree_free
-has no effect.
-.Sh RETURN VALUES
-.Fn X509_policy_check
-returns these values:
-.Bl -tag -width 2n
-.It \-2
-Validation failed because
-.Dv X509_V_FLAG_EXPLICIT_POLICY
-was requested but the resulting policy tree
-or the resulting user policy set would have been empty.
-In this case,
-.Pf * Fa pexplicit_policy
-is set to 1.
-If the resulting tree is empty,
-.Pf * Fa ptree
-is set to
-.Dv NULL ;
-otherwise, it is set to the resulting tree.
-.It \-1
-At least one of the
-.Fa certs
-contains invalid or inconsistent extensions.
-.Pf * Fa ptree
-is set to
-.Dv NULL
-and
-.Pf * Fa pexplicit_policy
-to 0.
-.It 0
-Internal error.
-For example, setting up the policy caches failed, or memory allocation
-failed while constructing the tree.
-.Pf * Fa ptree
-is set to
-.Dv NULL
-and
-.Pf * Fa pexplicit_policy
-may or may not be set.
-.It 1
-Validation succeeded and
-.Pf * Fa ptree
-and
-.Pf * Fa pexplicit_policy
-have been set.
-In the special cases that the
-.Fa certs
-argument contains exactly one certificate or that
-.Dv X509_V_FLAG_EXPLICIT_POLICY
-was not requested and at least one of the certificates contains no
-certificate policies or the resulting policy tree would have been empty,
-.Pf * Fa ptree
-is set to
-.Dv NULL
-and
-.Pf * Fa pexplicit_policy
-to 0.
-.El
-.Sh SEE ALSO
-.Xr ASN1_OBJECT_new 3 ,
-.Xr OBJ_nid2obj 3 ,
-.Xr STACK_OF 3 ,
-.Xr X509_check_purpose 3 ,
-.Xr X509_check_trust 3 ,
-.Xr X509_new 3 ,
-.Xr X509_policy_tree_get0_policies 3 ,
-.Xr X509_policy_tree_level_count 3 ,
-.Xr X509_verify_cert 3
-.Sh STANDARDS
-RFC 5280: Internet X.509 Public Key Infrastructure Certificate
-and Certificate Revocation List (CRL) Profile,
-section 6.1: Basic Path Validation
-.Sh HISTORY
-.Fn X509_policy_check
-and
-.Fn X509_policy_tree_free
-first appeared in OpenSSL 0.9.8 and have been available since
-.Ox 4.5 .