=pod

=head1 NAME

X509_STORE_set_lookup_crls_cb,
X509_STORE_set_verify_func,
X509_STORE_get_cleanup,
X509_STORE_set_cleanup,
X509_STORE_get_lookup_crls,
X509_STORE_set_lookup_crls,
X509_STORE_get_lookup_certs,
X509_STORE_set_lookup_certs,
X509_STORE_get_check_policy,
X509_STORE_set_check_policy,
X509_STORE_get_cert_crl,
X509_STORE_set_cert_crl,
X509_STORE_get_check_crl,
X509_STORE_set_check_crl,
X509_STORE_get_get_crl,
X509_STORE_set_get_crl,
X509_STORE_get_check_revocation,
X509_STORE_set_check_revocation,
X509_STORE_get_check_issued,
X509_STORE_set_check_issued,
X509_STORE_CTX_get1_issuer,
X509_STORE_get_get_issuer,
X509_STORE_set_get_issuer,
X509_STORE_CTX_get_verify,
X509_STORE_set_verify,
X509_STORE_get_verify_cb,
X509_STORE_set_verify_cb_func, X509_STORE_set_verify_cb,
X509_STORE_CTX_cert_crl_fn, X509_STORE_CTX_check_crl_fn,
X509_STORE_CTX_check_issued_fn, X509_STORE_CTX_check_policy_fn,
X509_STORE_CTX_check_revocation_fn, X509_STORE_CTX_cleanup_fn,
X509_STORE_CTX_get_crl_fn, X509_STORE_CTX_get_issuer_fn,
X509_STORE_CTX_lookup_certs_fn, X509_STORE_CTX_lookup_crls_fn
- set verification callback

=head1 SYNOPSIS

 #include <openssl/x509_vfy.h>

 typedef int (*X509_STORE_CTX_get_issuer_fn)(X509 **issuer,
                                             X509_STORE_CTX *ctx, const X509 *x);
 typedef int (*X509_STORE_CTX_check_issued_fn)(X509_STORE_CTX *ctx,
                                               const X509 *x, const X509 *issuer);
 typedef int (*X509_STORE_CTX_check_revocation_fn)(X509_STORE_CTX *ctx);
 typedef int (*X509_STORE_CTX_get_crl_fn)(X509_STORE_CTX *ctx,
                                          X509_CRL **crl, X509 *x);
 typedef int (*X509_STORE_CTX_check_crl_fn)(X509_STORE_CTX *ctx, X509_CRL *crl);
 typedef int (*X509_STORE_CTX_cert_crl_fn)(X509_STORE_CTX *ctx,
                                           X509_CRL *crl, X509 *x);
 typedef int (*X509_STORE_CTX_check_policy_fn)(X509_STORE_CTX *ctx);
 typedef STACK_OF(X509) *(*X509_STORE_CTX_lookup_certs_fn)(X509_STORE_CTX *ctx,
                                                           const X509_NAME *nm);
 typedef STACK_OF(X509_CRL) *(*X509_STORE_CTX_lookup_crls_fn)(const
                                                              X509_STORE_CTX *ctx,
                                                              const X509_NAME *nm);
 typedef int (*X509_STORE_CTX_cleanup_fn)(X509_STORE_CTX *ctx);

 void X509_STORE_set_verify_cb(X509_STORE *xs,
                               X509_STORE_CTX_verify_cb verify_cb);
 X509_STORE_CTX_verify_cb X509_STORE_get_verify_cb(const X509_STORE_CTX *ctx);

 void X509_STORE_set_verify(X509_STORE *xs, X509_STORE_CTX_verify_fn verify);
 X509_STORE_CTX_verify_fn X509_STORE_CTX_get_verify(const X509_STORE_CTX *ctx);

 int X509_STORE_CTX_get1_issuer(X509 **issuer, X509_STORE_CTX *ctx, const X509 *x);
 X509_STORE_CTX_get_issuer_fn X509_STORE_get_get_issuer(const X509_STORE_CTX *ctx);
 void X509_STORE_set_get_issuer(X509_STORE *xs,
                                X509_STORE_CTX_get_issuer_fn get_issuer);

 void X509_STORE_set_check_issued(X509_STORE *xs,
                                  X509_STORE_CTX_check_issued_fn check_issued);
 X509_STORE_CTX_check_issued_fn
     X509_STORE_get_check_issued(const X509_STORE_CTX *ctx);

 void X509_STORE_set_check_revocation(X509_STORE *xs,
                                      X509_STORE_CTX_check_revocation_fn check_revocation);
 X509_STORE_CTX_check_revocation_fn
     X509_STORE_get_check_revocation(const X509_STORE_CTX *ctx);

 void X509_STORE_set_get_crl(X509_STORE *xs,
                             X509_STORE_CTX_get_crl_fn get_crl);
 X509_STORE_CTX_get_crl_fn X509_STORE_get_get_crl(const X509_STORE_CTX *ctx);

 void X509_STORE_set_check_crl(X509_STORE *xs,
                               X509_STORE_CTX_check_crl_fn check_crl);
 X509_STORE_CTX_check_crl_fn
     X509_STORE_get_check_crl(const X509_STORE_CTX *ctx);

 void X509_STORE_set_cert_crl(X509_STORE *xs,
                              X509_STORE_CTX_cert_crl_fn cert_crl);
 X509_STORE_CTX_cert_crl_fn X509_STORE_get_cert_crl(const X509_STORE_CTX *ctx);

 void X509_STORE_set_check_policy(X509_STORE *xs,
                                  X509_STORE_CTX_check_policy_fn check_policy);
 X509_STORE_CTX_check_policy_fn
     X509_STORE_get_check_policy(const X509_STORE_CTX *ctx);

 void X509_STORE_set_lookup_certs(X509_STORE *xs,
                                  X509_STORE_CTX_lookup_certs_fn lookup_certs);
 X509_STORE_CTX_lookup_certs_fn
     X509_STORE_get_lookup_certs(const X509_STORE_CTX *ctx);

 void X509_STORE_set_lookup_crls(X509_STORE *xs,
                                 X509_STORE_CTX_lookup_crls_fn lookup_crls);
 X509_STORE_CTX_lookup_crls_fn
     X509_STORE_get_lookup_crls(const X509_STORE_CTX *ctx);

 void X509_STORE_set_cleanup(X509_STORE *xs,
                             X509_STORE_CTX_cleanup_fn cleanup);
 X509_STORE_CTX_cleanup_fn X509_STORE_get_cleanup(const X509_STORE_CTX *ctx);

 /* Aliases */
 void X509_STORE_set_verify_cb_func(X509_STORE *st,
                                    X509_STORE_CTX_verify_cb verify_cb);
 void X509_STORE_set_verify_func(X509_STORE *xs,
                                 X509_STORE_CTX_verify_fn verify);
 void X509_STORE_set_lookup_crls_cb(X509_STORE *xs,
                                    X509_STORE_CTX_lookup_crls_fn lookup_crls);

=head1 DESCRIPTION

X509_STORE_set_verify_cb() sets the verification callback of I<xs> to
I<verify_cb> overwriting the previous callback.
The callback assigned with this function becomes a default for the one
that can be assigned directly to the corresponding B<X509_STORE_CTX>,
please see L<X509_STORE_CTX_set_verify_cb(3)> for further information.

X509_STORE_set_verify() sets the final chain verification function for
I<xs> to I<verify>.
Its purpose is to go through the chain of certificates and check that
all signatures are valid and that the current time is within the
limits of each certificate's first and last validity time.
The final chain verification functions must return 0 on failure and 1
on success.
I<If no chain verification function is provided, the internal default
function will be used instead.>

X509_STORE_CTX_get1_issuer() tries to find a certificate from the I<store>
component of I<ctx> that has a subject name matching the issuer name of I<x>
and is accepted by the I<check_issued> function in I<ctx>.
On success it assigns to I<*issuer> the first match that has a suitable validity
period or otherwise has the latest expiration date of all matching certificates.
If the function returns 1 the caller is responsible for freeing I<*issuer>.
Note that this search does not support backtracking.

X509_STORE_set_get_issuer() sets the function I<get_issuer> that is used
to get the "best" candidate issuer certificate of the given certificate I<x>.
When such a certificate is found, I<get_issuer> must up-ref and assign it
to I<*issuer> and then return 1.
Otherwise I<get_issuer> must return 0 if not found and -1 (or 0) on failure.
If X509_STORE_set_get_issuer() is not used or I<get_issuer> is NULL
then X509_STORE_CTX_get1_issuer() is used as the default implementation.

X509_STORE_set_check_issued() sets the function to check that a given
certificate I<x> is issued by the issuer certificate I<issuer>.
This function must return 0 on failure (among others if I<x> hasn't
been issued with I<issuer>) and 1 on success.
I<If no function to get the issuer is provided, the internal default
function will be used instead.>

X509_STORE_set_check_revocation() sets the revocation checking
function.
Its purpose is to look through the final chain and check the
revocation status for each certificate.
It must return 0 on failure and 1 on success.
I<If no function to get the issuer is provided, the internal default
function will be used instead.>

X509_STORE_set_get_crl() sets the function to get the crl for a given
certificate I<x>.
When found, the crl must be assigned to I<*crl>.
This function must return 0 on failure and 1 on success.
I<If no function to get the issuer is provided, the internal default
function will be used instead.>

X509_STORE_set_check_crl() sets the function to check the validity of
the given I<crl>.
This function must return 0 on failure and 1 on success.
I<If no function to get the issuer is provided, the internal default
function will be used instead.>

X509_STORE_set_cert_crl() sets the function to check the revocation
status of the given certificate I<x> against the given I<crl>.
This function must return 0 on failure and 1 on success.
I<If no function to get the issuer is provided, the internal default
function will be used instead.>

X509_STORE_set_check_policy() sets the function to check the policies
of all the certificates in the final chain..
This function must return 0 on failure and 1 on success.
I<If no function to get the issuer is provided, the internal default
function will be used instead.>

X509_STORE_set_lookup_certs() and X509_STORE_set_lookup_crls() set the
functions to look up all the certs or all the CRLs that match the
given name I<nm>.
These functions return NULL on failure and a pointer to a stack of
certificates (B<X509>) or to a stack of CRLs (B<X509_CRL>) on
success.
I<If no function to get the issuer is provided, the internal default
function will be used instead.>

X509_STORE_set_cleanup() sets the final cleanup function, which is
called when the context (B<X509_STORE_CTX>) is being torn down.
This function doesn't return any value.
I<If no function to get the issuer is provided, the internal default
function will be used instead.>

X509_STORE_get_verify_cb(), X509_STORE_CTX_get_verify(),
X509_STORE_get_get_issuer(), X509_STORE_get_check_issued(),
X509_STORE_get_check_revocation(), X509_STORE_get_get_crl(),
X509_STORE_get_check_crl(), X509_STORE_set_verify(),
X509_STORE_set_get_issuer(), X509_STORE_get_cert_crl(),
X509_STORE_get_check_policy(), X509_STORE_get_lookup_certs(),
X509_STORE_get_lookup_crls() and X509_STORE_get_cleanup() all return
the function pointer assigned with X509_STORE_set_check_issued(),
X509_STORE_set_check_revocation(), X509_STORE_set_get_crl(),
X509_STORE_set_check_crl(), X509_STORE_set_cert_crl(),
X509_STORE_set_check_policy(), X509_STORE_set_lookup_certs(),
X509_STORE_set_lookup_crls() and X509_STORE_set_cleanup(), or NULL if
no assignment has been made.

X509_STORE_set_verify_cb_func(), X509_STORE_set_verify_func() and
X509_STORE_set_lookup_crls_cb() are aliases for
X509_STORE_set_verify_cb(), X509_STORE_set_verify() and
X509_STORE_set_lookup_crls, available as macros for backward
compatibility.

=head1 NOTES

All the callbacks from a B<X509_STORE> are inherited by the
corresponding B<X509_STORE_CTX> structure when it is initialized.
See L<X509_STORE_CTX_set_verify_cb(3)> for further details.

=head1 BUGS

The macro version of this function was the only one available before
OpenSSL 1.0.0.

=head1 RETURN VALUES

The X509_STORE_set_*() functions do not return a value.

The X509_STORE_get_*() functions return a pointer of the appropriate
function type.

X509_STORE_CTX_get1_issuer() returns
1 if a suitable certificate is found, 0 if not found, -1 on other error.

=head1 SEE ALSO

L<X509_STORE_CTX_set_verify_cb(3)>, L<X509_STORE_CTX_get0_chain(3)>,
L<X509_STORE_CTX_verify_cb(3)>, L<X509_STORE_CTX_verify_fn(3)>,
L<CMS_verify(3)>

=head1 HISTORY

The X509_STORE_set_verify_cb() function was added in OpenSSL 1.0.0.

The functions
X509_STORE_set_verify_cb(), X509_STORE_get_verify_cb(),
X509_STORE_set_verify(), X509_STORE_CTX_get_verify(),
X509_STORE_set_get_issuer(), X509_STORE_get_get_issuer(),
X509_STORE_set_check_issued(), X509_STORE_get_check_issued(),
X509_STORE_set_check_revocation(), X509_STORE_get_check_revocation(),
X509_STORE_set_get_crl(), X509_STORE_get_get_crl(),
X509_STORE_set_check_crl(), X509_STORE_get_check_crl(),
X509_STORE_set_cert_crl(), X509_STORE_get_cert_crl(),
X509_STORE_set_check_policy(), X509_STORE_get_check_policy(),
X509_STORE_set_lookup_certs(), X509_STORE_get_lookup_certs(),
X509_STORE_set_lookup_crls(), X509_STORE_get_lookup_crls(),
X509_STORE_set_cleanup() and X509_STORE_get_cleanup()
were added in OpenSSL 1.1.0.

=head1 COPYRIGHT

Copyright 2009-2026 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the Apache License 2.0 (the "License").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file LICENSE in the source distribution or at
L<https://www.openssl.org/source/license.html>.

=cut
