.\" $OpenBSD: X509_STORE_CTX_set_flags.3,v 1.7 2024/01/12 19:28:02 tb Exp $
.\" full merge up to: OpenSSL aae41f8c Jun 25 09:47:15 2015 +0100
.\" selective merge up to: OpenSSL 24a535ea Sep 22 13:14:20 2020 +0100
.\"
.\" This file is a derived work.
.\" The changes are covered by the following Copyright and license:
.\"
.\" Copyright (c) 2019 Claudio Jeker <claudio@openbsd.org>
.\" 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 AUTHORS DISCLAIM ALL WARRANTIES
.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS 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.
.\"
.\" The original file was written by Dr. Stephen Henson <steve@openssl.org>.
.\" Copyright (c) 2009 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: January 12 2024 $
.Dt X509_STORE_CTX_SET_FLAGS 3
.Os
.Sh NAME
.Nm X509_STORE_CTX_set_flags ,
.Nm X509_STORE_CTX_set_time ,
.Nm X509_STORE_CTX_set_depth ,
.Nm X509_STORE_CTX_set_trust ,
.Nm X509_STORE_CTX_set_purpose ,
.\" .Nm X509_STORE_CTX_purpose_inherit is intentionally undocumented
.\" because it will be removed in the next major bump.
.Nm X509_STORE_CTX_get0_param ,
.Nm X509_STORE_CTX_set0_param ,
.Nm X509_STORE_CTX_set_default
.Nd X509_STORE_CTX parameter initialisation
.Sh SYNOPSIS
.In openssl/x509_vfy.h
.Ft void
.Fo X509_STORE_CTX_set_flags
.Fa "X509_STORE_CTX *ctx"
.Fa "unsigned long flags"
.Fc
.Ft void
.Fo X509_STORE_CTX_set_time
.Fa "X509_STORE_CTX *ctx"
.Fa "unsigned long dummy"
.Fa "time_t time"
.Fc
.Ft void
.Fo X509_STORE_CTX_set_depth
.Fa "X509_STORE_CTX *ctx"
.Fa "int depth"
.Fc
.Ft int
.Fo X509_STORE_CTX_set_trust
.Fa "X509_STORE_CTX *ctx"
.Fa "int trust"
.Fc
.Ft int
.Fo X509_STORE_CTX_set_purpose
.Fa "X509_STORE_CTX *ctx"
.Fa "int purpose"
.Fc
.Ft X509_VERIFY_PARAM *
.Fo X509_STORE_CTX_get0_param
.Fa "X509_STORE_CTX *ctx"
.Fc
.Ft void
.Fo X509_STORE_CTX_set0_param
.Fa "X509_STORE_CTX *ctx"
.Fa "X509_VERIFY_PARAM *param"
.Fc
.Ft int
.Fo X509_STORE_CTX_set_default
.Fa "X509_STORE_CTX *ctx"
.Fa "const char *name"
.Fc
.Sh DESCRIPTION
These functions operate on the
.Vt X509_VERIFY_PARAM
object used by
.Fa ctx .
Usually,
.Xr X509_STORE_CTX_init 3
is called on
.Fa ctx
before these functions, and
.Xr X509_verify_cert 3
afterwards.
.Pp
.Fn X509_STORE_CTX_set_flags
sets the internal verification parameter flags to
.Fa flags .
See
.Xr X509_VERIFY_PARAM_set_flags 3
for a description of the verification flags.
.Pp
.Fn X509_STORE_CTX_set_time
sets the verification
.Fa time
using
.Xr X509_VERIFY_PARAM_set_time 3 .
The
.Fa dummy
argument is ignored.
.Pp
.Fn X509_STORE_CTX_set_depth
sets the maximum verification
.Fa depth
using
.Xr X509_VERIFY_PARAM_set_depth 3 .
That is the maximum number of untrusted CA certificates
that can appear in a chain.
.Pp
.Fn X509_STORE_CTX_set_trust
sets the
.Fa trust
identifier that can also be set using
.Xr X509_VERIFY_PARAM_set_trust 3 .
If the
.Fa trust
argument is 0 or invalid
or the trust identifier is already set to a non-zero value in the
.Vt X509_VERIFY_PARAM
object, no action occurs.
.Pp
.Fn X509_STORE_CTX_set_purpose
sets the
.Fa purpose
identifier that can also be set using
.Xr X509_VERIFY_PARAM_set_purpose 3 .
If the
.Fa purpose
argument is 0 or any failure occurs, nothing is changed.
.Pp
In the following, the trust identifier contained in the
.Vt X509_PURPOSE
object associated with
.Fa purpose
is called the
.Dq associated trust .
.Pp
The function fails if the
.Fa purpose
argument or the associated trust is invalid but not 0; otherwise,
.Fn X509_STORE_CTX_set_purpose
also does the equivalent of calling
.Fn X509_STORE_CTX_set_trust
with the associated trust.
.Pp
If the purpose identifier is already set to a non-zero value in the
.Vt X509_VERIFY_PARAM
object, it is not changed, even if the
.Fa purpose
argument is valid, too.
.Pp
.Fn X509_STORE_CTX_get0_param
retrieves an internal pointer to the verification parameters associated
with
.Fa ctx .
.Pp
.Fn X509_STORE_CTX_set0_param
sets the internal verification parameter pointer to
.Fa param .
After this call
.Fa param
should not be used.
.Pp
.Fn X509_STORE_CTX_set_default
looks up and sets the default verification method to
.Fa name .
This uses the function
.Xr X509_VERIFY_PARAM_lookup 3
to find an appropriate set of parameters from
.Fa name
and copies them using
.Xr X509_VERIFY_PARAM_inherit 3 .
.Sh RETURN VALUES
.Fn X509_STORE_CTX_set_trust
returns 1 if the
.Fa trust
argument is 0 or valid or 0 if it is invalid but not 0.
A return value of 1 does
.Em not
imply that the trust identifier stored in the
.Vt X509_VERIFY_PARAM
object was changed.
.Pp
.Fn X509_STORE_CTX_set_purpose
returns 1 if both the
.Fa purpose
argument and the associated trust are 0 or valid.
It returns 0 if either the
.Fa purpose
argument or the associated trust is invalid but not 0.
A return value of 1 does not imply that any data was changed.
.Pp
.Fn X509_STORE_CTX_get0_param
returns a pointer to an
.Vt X509_VERIFY_PARAM
structure or
.Dv NULL
if an error occurred.
.Pp
.Fn X509_STORE_CTX_set_default
returns 1 for success or 0 if an error occurred.
.Sh ERRORS
The following diagnostics can be retrieved with
.Xr ERR_get_error 3 ,
.Xr ERR_GET_REASON 3 ,
and
.Xr ERR_reason_error_string 3 :
.Bl -tag -width Ds
.It Dv X509_R_UNKNOWN_TRUST_ID Qq "unknown trust id"
.Fn X509_STORE_CTX_set_trust
was called with a
.Fa trust
argument that is invalid but not 0.
Other implementations may also return this when
.Fn X509_STORE_CTX_set_purpose
is called with a
.Fa purpose
argument with invalid associated trust.
.It Dv X509_R_UNKNOWN_PURPOSE_ID Qq "unknown purpose id"
The
.Fa purpose
argument is invalid but not 0.
.El
.Pp
The other functions provide no diagnostics.
.Sh SEE ALSO
.Xr X509_STORE_CTX_get_error 3 ,
.Xr X509_STORE_CTX_new 3 ,
.Xr X509_STORE_CTX_set_verify 3 ,
.Xr X509_STORE_CTX_set_verify_cb 3 ,
.Xr X509_STORE_new 3 ,
.Xr X509_STORE_set1_param 3 ,
.Xr X509_STORE_set_verify_cb 3 ,
.Xr X509_verify_cert 3 ,
.Xr X509_VERIFY_PARAM_new 3 ,
.Xr X509_VERIFY_PARAM_set_flags 3
.Sh HISTORY
.Fn X509_STORE_CTX_set_depth
first appeared in OpenSSL 0.9.3 and has been available since
.Ox 2.4 .
.Pp
.Fn X509_STORE_CTX_set_trust
and
.Fn X509_STORE_CTX_set_purpose
first appeared in OpenSSL 0.9.5 and have been available since
.Ox 2.7 .
.Pp
.Fn X509_STORE_CTX_set_flags
and
.Fn X509_STORE_CTX_set_time
first appeared in OpenSSL 0.9.6 and have been available since
.Ox 2.9 .
.Pp
.Fn X509_STORE_CTX_get0_param ,
.Fn X509_STORE_CTX_set0_param ,
and
.Fn X509_STORE_CTX_set_default
first appeared in OpenSSL 0.9.8 and have been available since
.Ox 4.5 .
.Sh CAVEATS
The precise effect of a successful call to
.Fn X509_STORE_CTX_set_trust
and
.Fn X509_STORE_CTX_set_purpose
is unclear unless only one of these functions is used immediately after
.Xr X509_STORE_CTX_init 3 .
It is therefore recommended to use
.Fn X509_STORE_CTX_get0_param ,
.Xr X509_VERIFY_PARAM_set_trust 3 ,
and
.Xr X509_VERIFY_PARAM_set_purpose 3
instead.
.Pp
The confusingly named
.Dv X509_TRUST_DEFAULT
is less than
.Dv X509_TRUST_MIN
and different implementations treat it as valid or invalid
when used as an associated trust or as a
.Fa trust
argument for
.Fn X509_STORE_CTX_set_trust .