.\" $OpenBSD: X509_STORE_CTX_set_flags.3,v 1.8 2024/08/29 20:21:10 tb Exp $
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.Dd $Mdocdate: August 29 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.