.\" $OpenBSD: X509_STORE_CTX_set_flags.3,v 1.6 2021/11/17 16:08:32 schwarze Exp $
.\" full merge up to: OpenSSL aae41f8c Jun 25 09:47:15 2015 +0100
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.\" Copyright (c) 2021 Ingo Schwarze <schwarze@openbsd.org>
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.Dd $Mdocdate: November 17 2021 $
.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 ,
.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 int
.Fo X509_STORE_CTX_purpose_inherit
.Fa "X509_STORE_CTX *ctx"
.Fa "int def_purpose"
.Fa "int purpose"
.Fa "int trust"
.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.
Here and in the following,
.Dv X509_TRUST_DEFAULT
counts as invalid.
.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 not 0 but invalid; 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_purpose_inherit
is similar to
.Fn X509_STORE_CTX_set_purpose ,
with the following modifications:
.Bl -bullet
.It
If the
.Fa purpose
argument is 0,
.Fa def_purpose
is used instead.
.It
If the associated trust is
.Dv X509_TRUST_DEFAULT ,
the trust associated with
.Fa def_purpose
is used instead, or if
.Fa def_purpose
is 0 or invalid, the function fails.
.It
If the
.Fa trust
argument is not 0, it is used instead of the associated trust,
and the equivalent of calling
.Fn X509_STORE_CTX_set_trust
is done even if both
.Fa purpose
and
.Fa def_purpose
are 0.
Even if the
.Fa trust
argument is not 0, if the (then unused) associated trust is
.Dv X509_TRUST_DEFAULT ,
.Fa def_purpose
is still required to be valid.
.El
.Pp
Note that, even if all arguments are valid and the return value is 1,
it is possible that nothing changed, or that only either one of the
purpose and trust identifiers were set, or that both were set.
It can also happen that the purpose identifier gets set according to the
.Fa purpose
argument, but the trust identifier gets set according to the
.Fa def_purpose
argument in the same call.
.Pp
The intended way of using this function is to pass the purpose and
trust attributes of another structure of an arbitrary type as the
.Fa purpose
and
.Fa trust
arguments, and to provide
.Fa def_purpose
as a fallback in case the settings in the other structure are incomplete.
.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 not 0 but invalid.
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 not 0 but invalid.
A return value of 1 does not imply that any data was changed.
.Pp
.Fn X509_STORE_CTX_purpose_inherit
returns 0 if:
.Bl -bullet
.It
The
.Fa purpose
argument is not 0 and invalid.
.It
The
.Fa purpose
argument is 0 and the
.Fa def_purpose
argument is not 0 and invalid.
.It
The associated trust is
.Dv X509_TRUST_DEFAULT
and the
.Fa def_purpose
argument is 0 or invalid,
or the trust identifier associated with it is not 0 but invalid.
.It
The
.Fa trust
argument is not 0 and invalid.
.It
The
.Fa trust
argument is 0 and the associated trust is neither 0 nor
.Dv X509_TRUST_DEFAULT
but invalid.
.El
.Pp
Otherwise,
.Fn X509_STORE_CTX_purpose_inherit
returns 1, which 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
For
.Fn X509_STORE_CTX_set_trust ,
.Fn X509_STORE_CTX_set_purpose ,
and
.Fn X509_STORE_CTX_purpose_inherit ,
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"
The
.Fa trust
argument or the trust identifier associated with
.Fa purpose
or
.Fa def_purpose
is not 0 but invalid,
.It Dv X509_R_UNKNOWN_PURPOSE_ID Qq "unknown purpose id"
The
.Fa purpose
argument is not 0 and invalid.
Or it is 0 and the
.Fa def_purpose
argument is not 0 and invalid.
Or the associated trust is
.Dv X509_TRUST_DEFAULT
and
.Fa def_purpose
is 0 or invalid.
.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 ,
.Fn X509_STORE_CTX_set_purpose ,
and
.Fn X509_STORE_CTX_purpose_inherit
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 .