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.\" ========================================================================
.\"
.IX Title "X509_STORE_CTX_NEW 3"
.TH X509_STORE_CTX_NEW 3 "2020-09-22" "1.1.1h" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
X509_STORE_CTX_new, X509_STORE_CTX_cleanup, X509_STORE_CTX_free, X509_STORE_CTX_init, X509_STORE_CTX_set0_trusted_stack, X509_STORE_CTX_set_cert, X509_STORE_CTX_set0_crls, X509_STORE_CTX_get0_chain, X509_STORE_CTX_set0_verified_chain, X509_STORE_CTX_get0_param, X509_STORE_CTX_set0_param, X509_STORE_CTX_get0_untrusted, X509_STORE_CTX_set0_untrusted, X509_STORE_CTX_get_num_untrusted, X509_STORE_CTX_set_default, X509_STORE_CTX_set_verify, X509_STORE_CTX_verify_fn \&\- X509_STORE_CTX initialisation
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/x509_vfy.h>
\&
\& X509_STORE_CTX *X509_STORE_CTX_new(void);
\& void X509_STORE_CTX_cleanup(X509_STORE_CTX *ctx);
\& void X509_STORE_CTX_free(X509_STORE_CTX *ctx);
\&
\& int X509_STORE_CTX_init(X509_STORE_CTX *ctx, X509_STORE *store,
\&                         X509 *x509, STACK_OF(X509) *chain);
\&
\& void X509_STORE_CTX_set0_trusted_stack(X509_STORE_CTX *ctx, STACK_OF(X509) *sk);
\&
\& void X509_STORE_CTX_set_cert(X509_STORE_CTX *ctx, X509 *x);
\& STACK_OF(X509) *X509_STORE_CTX_get0_chain(X509_STORE_CTX *ctx);
\& void X509_STORE_CTX_set0_verified_chain(X509_STORE_CTX *ctx, STACK_OF(X509) *chain);
\& void X509_STORE_CTX_set0_crls(X509_STORE_CTX *ctx, STACK_OF(X509_CRL) *sk);
\&
\& X509_VERIFY_PARAM *X509_STORE_CTX_get0_param(X509_STORE_CTX *ctx);
\& void X509_STORE_CTX_set0_param(X509_STORE_CTX *ctx, X509_VERIFY_PARAM *param);
\& int X509_STORE_CTX_set_default(X509_STORE_CTX *ctx, const char *name);
\&
\& STACK_OF(X509)* X509_STORE_CTX_get0_untrusted(X509_STORE_CTX *ctx);
\& void X509_STORE_CTX_set0_untrusted(X509_STORE_CTX *ctx, STACK_OF(X509) *sk);
\&
\& int X509_STORE_CTX_get_num_untrusted(X509_STORE_CTX *ctx);
\&
\& typedef int (*X509_STORE_CTX_verify_fn)(X509_STORE_CTX *);
\& void X509_STORE_CTX_set_verify(X509_STORE_CTX *ctx, X509_STORE_CTX_verify_fn verify);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
These functions initialise an \fBX509_STORE_CTX\fR structure for subsequent use
by \fBX509_verify_cert()\fR.
.PP
\&\fBX509_STORE_CTX_new()\fR returns a newly initialised \fBX509_STORE_CTX\fR structure.
.PP
\&\fBX509_STORE_CTX_cleanup()\fR internally cleans up an \fBX509_STORE_CTX\fR structure.
The context can then be reused with a new call to \fBX509_STORE_CTX_init()\fR.
.PP
\&\fBX509_STORE_CTX_free()\fR completely frees up \fBctx\fR. After this call \fBctx\fR
is no longer valid.
If \fBctx\fR is \s-1NULL\s0 nothing is done.
.PP
\&\fBX509_STORE_CTX_init()\fR sets up \fBctx\fR for a subsequent verification operation.
It must be called before each call to \fBX509_verify_cert()\fR, i.e. a \fBctx\fR is only
good for one call to \fBX509_verify_cert()\fR; if you want to verify a second
certificate with the same \fBctx\fR then you must call \fBX509_STORE_CTX_cleanup()\fR
and then \fBX509_STORE_CTX_init()\fR again before the second call to
\&\fBX509_verify_cert()\fR. The trusted certificate store is set to \fBstore\fR, the end
entity certificate to be verified is set to \fBx509\fR and a set of additional
certificates (which will be untrusted but may be used to build the chain) in
\&\fBchain\fR. Any or all of the \fBstore\fR, \fBx509\fR and \fBchain\fR parameters can be
\&\fB\s-1NULL\s0\fR.
.PP
\&\fBX509_STORE_CTX_set0_trusted_stack()\fR sets the set of trusted certificates of
\&\fBctx\fR to \fBsk\fR. This is an alternative way of specifying trusted certificates
instead of using an \fBX509_STORE\fR.
.PP
\&\fBX509_STORE_CTX_set_cert()\fR sets the certificate to be verified in \fBctx\fR to
\&\fBx\fR.
.PP
\&\fBX509_STORE_CTX_set0_verified_chain()\fR sets the validated chain used
by \fBctx\fR to be \fBchain\fR.
Ownership of the chain is transferred to \fBctx\fR and should not be
free'd by the caller.
\&\fBX509_STORE_CTX_get0_chain()\fR returns the internal pointer used by the
\&\fBctx\fR that contains the validated chain.
.PP
\&\fBX509_STORE_CTX_set0_crls()\fR sets a set of CRLs to use to aid certificate
verification to \fBsk\fR. These CRLs will only be used if \s-1CRL\s0 verification is
enabled in the associated \fBX509_VERIFY_PARAM\fR structure. This might be
used where additional \*(L"useful\*(R" CRLs are supplied as part of a protocol,
for example in a PKCS#7 structure.
.PP
\&\fBX509_STORE_CTX_get0_param()\fR retrieves an internal pointer
to the verification parameters associated with \fBctx\fR.
.PP
\&\fBX509_STORE_CTX_get0_untrusted()\fR retrieves an internal pointer to the
stack of untrusted certificates associated with \fBctx\fR.
.PP
\&\fBX509_STORE_CTX_set0_untrusted()\fR sets the internal point to the stack
of untrusted certificates associated with \fBctx\fR to \fBsk\fR.
.PP
\&\fBX509_STORE_CTX_set0_param()\fR sets the internal verification parameter pointer
to \fBparam\fR. After this call \fBparam\fR should not be used.
.PP
\&\fBX509_STORE_CTX_set_default()\fR looks up and sets the default verification
method to \fBname\fR. This uses the function \fBX509_VERIFY_PARAM_lookup()\fR to
find an appropriate set of parameters from \fBname\fR.
.PP
\&\fBX509_STORE_CTX_get_num_untrusted()\fR returns the number of untrusted certificates
that were used in building the chain following a call to \fBX509_verify_cert()\fR.
.PP
\&\fBX509_STORE_CTX_set_verify()\fR provides the capability for overriding the default
verify function. This function is responsible for verifying chain signatures and
expiration times.
.PP
A verify function is defined as an X509_STORE_CTX_verify type which has the
following signature:
.PP
.Vb 1
\& int (*verify)(X509_STORE_CTX *);
.Ve
.PP
This function should receive the current X509_STORE_CTX as a parameter and
return 1 on success or 0 on failure.
.SH "NOTES"
.IX Header "NOTES"
The certificates and CRLs in a store are used internally and should \fBnot\fR
be freed up until after the associated \fBX509_STORE_CTX\fR is freed.
.SH "BUGS"
.IX Header "BUGS"
The certificates and CRLs in a context are used internally and should \fBnot\fR
be freed up until after the associated \fBX509_STORE_CTX\fR is freed. Copies
should be made or reference counts increased instead.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBX509_STORE_CTX_new()\fR returns a newly allocated context or \fB\s-1NULL\s0\fR if an
error occurred.
.PP
\&\fBX509_STORE_CTX_init()\fR returns 1 for success or 0 if an error occurred.
.PP
\&\fBX509_STORE_CTX_get0_param()\fR returns a pointer to an \fBX509_VERIFY_PARAM\fR
structure or \fB\s-1NULL\s0\fR if an error occurred.
.PP
\&\fBX509_STORE_CTX_cleanup()\fR, \fBX509_STORE_CTX_free()\fR,
\&\fBX509_STORE_CTX_set0_trusted_stack()\fR,
\&\fBX509_STORE_CTX_set_cert()\fR,
\&\fBX509_STORE_CTX_set0_crls()\fR and \fBX509_STORE_CTX_set0_param()\fR do not return
values.
.PP
\&\fBX509_STORE_CTX_set_default()\fR returns 1 for success or 0 if an error occurred.
.PP
\&\fBX509_STORE_CTX_get_num_untrusted()\fR returns the number of untrusted certificates
used.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBX509_verify_cert\fR\|(3)
\&\fBX509_VERIFY_PARAM_set_flags\fR\|(3)
.SH "HISTORY"
.IX Header "HISTORY"
The \fBX509_STORE_CTX_set0_crls()\fR function was added in OpenSSL 1.0.0.
The \fBX509_STORE_CTX_get_num_untrusted()\fR function was added in OpenSSL 1.1.0.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2009\-2020 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (the \*(L"License\*(R").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.