X509_STORE_CTX_NEW(3ossl) OpenSSL X509_STORE_CTX_NEW(3ossl)
NAME
X509_STORE_CTX_new_ex, X509_STORE_CTX_new, X509_STORE_CTX_cleanup,
X509_STORE_CTX_free, X509_STORE_CTX_init, X509_STORE_CTX_init_rpk,
X509_STORE_CTX_set0_trusted_stack, X509_STORE_CTX_set_cert,
X509_STORE_CTX_set0_crls, X509_STORE_CTX_set0_rpk,
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_get0_chain,
X509_STORE_CTX_set0_verified_chain, X509_STORE_CTX_get0_rpk,
X509_STORE_CTX_set_default, X509_STORE_CTX_set_verify,
X509_STORE_CTX_verify_fn, X509_STORE_CTX_set_purpose,
X509_STORE_CTX_set_trust, X509_STORE_CTX_purpose_inherit -
X509_STORE_CTX initialisation
SYNOPSIS
#include <openssl/x509_vfy.h>
X509_STORE_CTX *X509_STORE_CTX_new_ex(OSSL_LIB_CTX *libctx, const char *propq);
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 *trust_store,
X509 *target, STACK_OF(X509) *untrusted);
int X509_STORE_CTX_init_rpk(X509_STORE_CTX *ctx, X509_STORE *trust_store,
EVP_PKEY *rpk);
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 *target);
void X509_STORE_CTX_set0_crls(X509_STORE_CTX *ctx, STACK_OF(X509_CRL) *sk);
void X509_STORE_CTX_set0_rpk(X509_STORE_CTX *ctx, EVP_PKEY *target);
X509_VERIFY_PARAM *X509_STORE_CTX_get0_param(const X509_STORE_CTX *ctx);
void X509_STORE_CTX_set0_param(X509_STORE_CTX *ctx, X509_VERIFY_PARAM *param);
STACK_OF(X509)* X509_STORE_CTX_get0_untrusted(const 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(const X509_STORE_CTX *ctx);
STACK_OF(X509) *X509_STORE_CTX_get0_chain(const X509_STORE_CTX *ctx);
void X509_STORE_CTX_set0_verified_chain(X509_STORE_CTX *ctx, STACK_OF(X509) *chain);
EVP_PKEY *X509_STORE_CTX_get0_rpk(const X509_STORE_CTX *ctx);
int X509_STORE_CTX_set_default(X509_STORE_CTX *ctx, const char *name);
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);
int X509_STORE_CTX_set_purpose(X509_STORE_CTX *ctx, int purpose);
int X509_STORE_CTX_set_trust(X509_STORE_CTX *ctx, int trust);
int X509_STORE_CTX_purpose_inherit(X509_STORE_CTX *ctx, int def_purpose,
int purpose, int trust);
DESCRIPTION
These functions initialise an X509_STORE_CTX structure for subsequent
use by X509_verify_cert(3) or X509_STORE_CTX_verify(3).
X509_STORE_CTX_new_ex() returns a newly initialised X509_STORE_CTX
structure associated with the specified library context libctx and
property query string propq. Any cryptographic algorithms fetched while
performing processing with the X509_STORE_CTX will use that library
context and property query string.
X509_STORE_CTX_new(3) is the same as X509_STORE_CTX_new_ex() except that
the default library context and a NULL property query string are used.
X509_STORE_CTX_cleanup() internally cleans up an X509_STORE_CTX
structure. It is used by X509_STORE_CTX_init() and
X509_STORE_CTX_free().
X509_STORE_CTX_free() completely frees up ctx. After this call ctx is
no longer valid. If ctx is NULL nothing is done.
X509_STORE_CTX_init() sets up ctx for a subsequent verification
operation. It must be called before each call to X509_verify_cert(3)
or X509_STORE_CTX_verify(3), i.e., a context is only good for one
verification. If you want to verify a further certificate or chain
with the same ctx then you must call X509_STORE_CTX_init() again. The
trusted certificate store is set to trust_store of type X509_STORE.
This may be NULL because there are no trusted certificates or because
they are provided simply as a list using
X509_STORE_CTX_set0_trusted_stack(). The certificate to be verified is
set to target, and a list of additional certificates may be provided in
untrusted, which will be untrusted but may be used to build the chain.
The target certificate is not copied (its reference count is not
updated), and the caller must not free it before verification is
complete. Each of the trust_store, target and untrusted parameters can
be NULL. Yet note that X509_verify_cert(3) and X509_STORE_CTX_verify(3)
will need a verification target. This can also be set using
X509_STORE_CTX_set_cert(). For X509_STORE_CTX_verify(3), which takes
by default the first element of the list of untrusted certificates as
its verification target, this can be also set indirectly using
X509_STORE_CTX_set0_untrusted().
X509_STORE_CTX_init_rpk() sets up ctx for a subsequent verification
operation for the target raw public key. It behaves similarly to
X509_STORE_CTX_init(). The target raw public key can also be supplied
separately, via X509_STORE_CTX_set0_rpk(). The target public key is
not copied (its reference count is not updated), and the caller must
not free it before verification is complete.
X509_STORE_CTX_set0_trusted_stack() sets the set of trusted
certificates of ctx to sk. This is an alternative way of specifying
trusted certificates instead of using an X509_STORE where its
complexity is not needed or to make sure that only the given set sk of
certificates are trusted.
X509_STORE_CTX_set_cert() sets the target certificate to be verified in
ctx to target. The target certificate is not copied (its reference
count is not updated), and the caller must not free it before
verification is complete.
X509_STORE_CTX_set0_rpk() sets the target raw public key to be verified
in ctx to target, a non-NULL raw public key preempts any target
certificate, which is then ignored. The target public key is not
copied (its reference count is not updated), and the caller must not
free it before verification is complete.
X509_STORE_CTX_set0_verified_chain() sets the validated chain to chain.
Ownership of the chain is transferred to ctx, and so it should not be
free'd by the caller.
X509_STORE_CTX_get0_chain() returns the internal pointer used by the
ctx that contains the constructed (output) chain.
X509_STORE_CTX_get0_rpk() returns the internal pointer used by the ctx
that contains the raw public key.
X509_STORE_CTX_set0_crls() sets a set of CRLs to use to aid certificate
verification to sk. These CRLs will only be used if CRL verification is
enabled in the associated X509_VERIFY_PARAM structure. This might be
used where additional "useful" CRLs are supplied as part of a protocol,
for example in a PKCS#7 structure.
X509_STORE_CTX_get0_param() retrieves an internal pointer to the
verification parameters associated with ctx.
X509_STORE_CTX_set0_param() sets the internal verification parameter
pointer to param. After this call param should not be used.
X509_STORE_CTX_get0_untrusted() retrieves an internal pointer to the
stack of untrusted certificates associated with ctx.
X509_STORE_CTX_set0_untrusted() sets the internal pointer to the stack
of untrusted certificates associated with ctx to sk.
X509_STORE_CTX_verify() will take the first element, if any, as its
default target if the target certificate is not set explicitly.
X509_STORE_CTX_get_num_untrusted() returns the number of untrusted
certificates that were used in building the chain. This is can be used
after calling X509_verify_cert(3) and similar functions. With
X509_STORE_CTX_verify(3), this does not count the first chain element.
X509_STORE_CTX_get0_chain() returns the internal pointer used by the
ctx that contains the validated chain.
Details of the chain building and checking process are described in
"Certification Path Building" in openssl-verification-options(1) and
"Certification Path Validation" in openssl-verification-options(1).
X509_STORE_CTX_set0_verified_chain() sets the validated chain used by
ctx to be chain. Ownership of the chain is transferred to ctx, and so
it should not be free'd by the caller.
X509_STORE_CTX_set_default() looks up and sets the default verification
method to name. This uses the function X509_VERIFY_PARAM_lookup() to
find an appropriate set of parameters from the purpose identifier name.
Currently defined purposes are "sslclient", "sslserver", "nssslserver",
"smimesign", "smimeencrypt", "crlsign", "ocsphelper", "timestampsign",
and "any".
X509_STORE_CTX_set_verify() provides the capability for overriding the
default verify function. This function is responsible for verifying
chain signatures and expiration times.
A verify function is defined as an X509_STORE_CTX_verify type which has
the following signature:
int (*verify)(X509_STORE_CTX *);
This function should receive the current X509_STORE_CTX as a parameter
and return 1 on success or 0 on failure.
X509 certificates may contain information about what purposes keys
contained within them can be used for. For example "TLS WWW Server
Authentication" or "Email Protection". This "key usage" information is
held internally to the certificate itself. In addition the trust store
containing trusted certificates can declare what purposes we trust
different certificates for. This "trust" information is not held within
the certificate itself but is "meta" information held alongside it.
This "meta" information is associated with the certificate after it is
issued and could be determined by a system administrator. For example a
certificate might declare that it is suitable for use for both "TLS WWW
Server Authentication" and "TLS Client Authentication", but a system
administrator might only trust it for the former. An X.509 certificate
extension exists that can record extended key usage information to
supplement the purpose information described above. This extended
mechanism is arbitrarily extensible and not well suited for a generic
library API; applications that need to validate extended key usage
information in certificates will need to define a custom "purpose" (see
below) or supply a nondefault verification callback
(X509_STORE_set_verify_cb_func(3)).
X509_STORE_CTX_set_purpose() sets the purpose for the target
certificate being verified in the ctx. Built-in available values for
the purpose argument are X509_PURPOSE_SSL_CLIENT,
X509_PURPOSE_SSL_SERVER, X509_PURPOSE_NS_SSL_SERVER,
X509_PURPOSE_SMIME_SIGN, X509_PURPOSE_SMIME_ENCRYPT,
X509_PURPOSE_CRL_SIGN, X509_PURPOSE_ANY, X509_PURPOSE_OCSP_HELPER,
X509_PURPOSE_TIMESTAMP_SIGN and X509_PURPOSE_CODE_SIGN. It is also
possible to create a custom purpose value. Setting a purpose requests
that the key usage and extended key usage (EKU) extensions optionally
declared within the certificate and its chain are verified to be
consistent with that purpose. For SSL client, SSL server, and S/MIME
purposes, the EKU is checked also for the CA certificates along the
chain, including any given trust anchor certificate. Potentially also
further checks are done (depending on the purpose given). Every
purpose also has an associated default trust value, which will also be
set at the same time. During verification, this trust setting will be
verified to check whether it is consistent with the trust set by the
system administrator for certificates in the chain.
X509_STORE_CTX_set_trust() sets the trust value for the target
certificate being verified in the ctx. Built-in available values for
the trust argument are X509_TRUST_COMPAT, X509_TRUST_SSL_CLIENT,
X509_TRUST_SSL_SERVER, X509_TRUST_EMAIL, X509_TRUST_OBJECT_SIGN,
X509_TRUST_OCSP_SIGN, X509_TRUST_OCSP_REQUEST and X509_TRUST_TSA. It is
also possible to create a custom trust value. Since
X509_STORE_CTX_set_purpose() also sets the trust value it is normally
sufficient to only call that function. If both are called then
X509_STORE_CTX_set_trust() should be called after
X509_STORE_CTX_set_purpose() since the trust setting of the last call
will be used.
It should not normally be necessary for end user applications to call
X509_STORE_CTX_purpose_inherit() directly. Typically applications
should call X509_STORE_CTX_set_purpose() or X509_STORE_CTX_set_trust()
instead. Using this function it is possible to set the purpose and
trust values for the ctx at the same time. Both ctx and its internal
verification parameter pointer must not be NULL. The def_purpose and
purpose arguments can have the same purpose values as described for
X509_STORE_CTX_set_purpose() above. The trust argument can have the
same trust values as described in X509_STORE_CTX_set_trust() above. Any
of the def_purpose, purpose or trust values may also have the value 0
to indicate that the supplied parameter should be ignored. After
calling this function the purpose to be used for verification is set
from the purpose argument unless the purpose was already set in ctx
before, and the trust is set from the trust argument unless the trust
was already set in ctx before. If trust is 0 then the trust value will
be set from the default trust value for purpose. If the default trust
value for the purpose is X509_TRUST_DEFAULT and trust is 0 then the
default trust value associated with the def_purpose value is used for
the trust setting instead.
NOTES
The certificates and CRLs in a store are used internally and should not
be freed up until after the associated X509_STORE_CTX is freed.
BUGS
The certificates and CRLs in a context are used internally and should
not be freed up until after the associated X509_STORE_CTX is freed.
Copies should be made or reference counts increased instead.
RETURN VALUES
X509_STORE_CTX_new(3) returns a newly allocated context or NULL if an
error occurred.
X509_STORE_CTX_init() and X509_STORE_CTX_init_rpk() return 1 for
success or 0 if an error occurred.
X509_STORE_CTX_get0_param() returns a pointer to an X509_VERIFY_PARAM
structure or NULL if an error occurred.
X509_STORE_CTX_get0_rpk() returns a pointer to an EVP_PKEY structure if
present, or NULL if absent.
X509_STORE_CTX_cleanup(), X509_STORE_CTX_free(),
X509_STORE_CTX_set0_trusted_stack(), X509_STORE_CTX_set_cert(),
X509_STORE_CTX_set0_crls() and X509_STORE_CTX_set0_param() do not
return values.
X509_STORE_CTX_set_default() returns 1 for success or 0 if an error
occurred.
X509_STORE_CTX_get_num_untrusted() returns the number of untrusted
certificates used.
SEE ALSO
X509_verify_cert(3), X509_STORE_CTX_verify(3),
X509_VERIFY_PARAM_set_flags(3)
HISTORY
The X509_STORE_CTX_set0_crls() function was added in OpenSSL 1.0.0.
The X509_STORE_CTX_get_num_untrusted() function was added in OpenSSL
1.1.0. The X509_STORE_CTX_new_ex() function was added in OpenSSL 3.0.
The X509_STORE_CTX_init_rpk(), X509_STORE_CTX_get0_rpk(), and
X509_STORE_CTX_set0_rpk() functions were added in OpenSSL 3.2.
There is no need to call X509_STORE_CTX_cleanup() explicitly since
OpenSSL 3.0.
COPYRIGHT
Copyright 2009-2023 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
<https://www.openssl.org/source/license.html>.
3.2.0 2023-11-23 X509_STORE_CTX_NEW(3ossl)
openssl 3.2.0 - Generated Thu Nov 30 10:18:18 CST 2023