mirror of
https://github.com/openssl/openssl.git
synced 2024-12-15 06:01:37 +08:00
b195677073
Reviewed-by: Paul Dale <pauli@openssl.org> (Merged from https://github.com/openssl/openssl/pull/15242)
399 lines
16 KiB
Plaintext
399 lines
16 KiB
Plaintext
=pod
|
|
|
|
=head1 NAME
|
|
|
|
ossl_provider_find, ossl_provider_new, ossl_provider_up_ref,
|
|
ossl_provider_free,
|
|
ossl_provider_set_fallback, ossl_provider_set_module_path,
|
|
ossl_provider_add_parameter, ossl_provider_set_child, ossl_provider_get_parent,
|
|
ossl_provider_up_ref_parent, ossl_provider_free_parent,
|
|
ossl_provider_default_props_update, ossl_provider_get0_dispatch,
|
|
ossl_provider_init_as_child,
|
|
ossl_provider_activate, ossl_provider_deactivate, ossl_provider_available,
|
|
ossl_provider_ctx,
|
|
ossl_provider_doall_activated,
|
|
ossl_provider_name, ossl_provider_dso,
|
|
ossl_provider_module_name, ossl_provider_module_path,
|
|
ossl_provider_libctx,
|
|
ossl_provider_teardown, ossl_provider_gettable_params,
|
|
ossl_provider_get_params, ossl_provider_clear_all_operation_bits,
|
|
ossl_provider_query_operation, ossl_provider_unquery_operation,
|
|
ossl_provider_set_operation_bit, ossl_provider_test_operation_bit,
|
|
ossl_provider_get_capabilities
|
|
- internal provider routines
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
#include "internal/provider.h"
|
|
|
|
OSSL_PROVIDER *ossl_provider_find(OSSL_LIB_CTX *libctx, const char *name,
|
|
int noconfig);
|
|
OSSL_PROVIDER *ossl_provider_new(OSSL_LIB_CTX *libctx, const char *name,
|
|
ossl_provider_init_fn *init_function
|
|
int noconfig);
|
|
int ossl_provider_up_ref(OSSL_PROVIDER *prov);
|
|
void ossl_provider_free(OSSL_PROVIDER *prov);
|
|
|
|
/* Setters */
|
|
int ossl_provider_set_fallback(OSSL_PROVIDER *prov);
|
|
int ossl_provider_set_module_path(OSSL_PROVIDER *prov, const char *path);
|
|
int ossl_provider_add_parameter(OSSL_PROVIDER *prov, const char *name,
|
|
const char *value);
|
|
|
|
/* Child Providers */
|
|
int ossl_provider_set_child(OSSL_PROVIDER *prov,
|
|
const OSSL_CORE_HANDLE *handle);
|
|
const OSSL_CORE_HANDLE *ossl_provider_get_parent(OSSL_PROVIDER *prov);
|
|
int ossl_provider_up_ref_parent(OSSL_PROVIDER *prov, int activate);
|
|
int ossl_provider_free_parent(OSSL_PROVIDER *prov, int deactivate);
|
|
int ossl_provider_default_props_update(OSSL_LIB_CTX *libctx,
|
|
const char *props);
|
|
|
|
/*
|
|
* Activate the Provider
|
|
* If the Provider is a module, the module will be loaded
|
|
*/
|
|
int ossl_provider_activate(OSSL_PROVIDER *prov, int retain_fallbacks,
|
|
int upcalls);
|
|
int ossl_provider_deactivate(OSSL_PROVIDER *prov);
|
|
/* Check if provider is available (activated) */
|
|
int ossl_provider_available(OSSL_PROVIDER *prov);
|
|
|
|
/* Return pointer to the provider's context */
|
|
void *ossl_provider_ctx(const OSSL_PROVIDER *prov);
|
|
|
|
const OSSL_DISPATCH *ossl_provider_get0_dispatch(const OSSL_PROVIDER *prov);
|
|
|
|
/* Iterate over all loaded providers */
|
|
int ossl_provider_doall_activated(OSSL_LIB_CTX *,
|
|
int (*cb)(OSSL_PROVIDER *provider,
|
|
void *cbdata),
|
|
void *cbdata);
|
|
|
|
/* Getters for other library functions */
|
|
const char *ossl_provider_name(OSSL_PROVIDER *prov);
|
|
const DSO *ossl_provider_dso(OSSL_PROVIDER *prov);
|
|
const char *ossl_provider_module_name(OSSL_PROVIDER *prov);
|
|
const char *ossl_provider_module_path(OSSL_PROVIDER *prov);
|
|
OSSL_LIB_CTX *ossl_provider_libctx(const OSSL_PROVIDER *prov);
|
|
|
|
/* Thin wrappers around calls to the provider */
|
|
void ossl_provider_teardown(const OSSL_PROVIDER *prov);
|
|
const OSSL_PARAM *ossl_provider_gettable_params(const OSSL_PROVIDER *prov);
|
|
int ossl_provider_get_params(const OSSL_PROVIDER *prov, OSSL_PARAM params[]);
|
|
int ossl_provider_get_capabilities(const OSSL_PROVIDER *prov,
|
|
const char *capability,
|
|
OSSL_CALLBACK *cb,
|
|
void *arg);
|
|
const OSSL_ALGORITHM *ossl_provider_query_operation(const OSSL_PROVIDER *prov,
|
|
int operation_id,
|
|
int *no_cache);
|
|
void ossl_provider_unquery_operation(const OSSL_PROVIDER *prov,
|
|
int operation_id,
|
|
const OSSL_ALGORITHM *algs);
|
|
|
|
int ossl_provider_set_operation_bit(OSSL_PROVIDER *provider, size_t bitnum);
|
|
int ossl_provider_test_operation_bit(OSSL_PROVIDER *provider, size_t bitnum,
|
|
int *result);
|
|
int ossl_provider_clear_all_operation_bits(OSSL_LIB_CTX *libctx);
|
|
|
|
int ossl_provider_init_as_child(OSSL_LIB_CTX *ctx,
|
|
const OSSL_CORE_HANDLE *handle,
|
|
const OSSL_DISPATCH *in);
|
|
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
I<OSSL_PROVIDER> is a type that holds all the necessary information
|
|
to handle a provider, regardless of if it's built in to the
|
|
application or the OpenSSL libraries, or if it's a loadable provider
|
|
module.
|
|
Instances of this type are commonly referred to as "provider objects".
|
|
|
|
A provider object is always stored in a set of provider objects
|
|
in the library context.
|
|
|
|
Provider objects are reference counted.
|
|
|
|
Provider objects are initially inactive, i.e. they are only recorded
|
|
in the store, but are not used.
|
|
They are activated with the first call to ossl_provider_activate(),
|
|
and are deactivated with the last call to ossl_provider_deactivate().
|
|
Activation affects a separate counter.
|
|
|
|
=head2 Functions
|
|
|
|
ossl_provider_find() finds an existing provider object in the provider
|
|
object store by I<name>.
|
|
The config file will be automatically loaded unless I<noconfig> is set.
|
|
Typically I<noconfig> should be 0.
|
|
We set I<noconfig> to 1 only when calling these functions while processing a
|
|
config file in order to avoid recursively attempting to load the file.
|
|
The provider object it finds has its reference count incremented.
|
|
|
|
ossl_provider_new() creates a new provider object named I<name> and
|
|
stores it in the provider object store, unless there already is one
|
|
there with the same name.
|
|
If there already is one with the same name, it's returned with its
|
|
reference count incremented.
|
|
The config file will be automatically loaded unless I<noconfig> is set.
|
|
Typically I<noconfig> should be 0.
|
|
We set I<noconfig> to 1 only when calling these functions while processing a
|
|
config file in order to avoid recursively attempting to load the file.
|
|
The reference count of a newly created provider object will always
|
|
be 2; one for being added to the store, and one for the returned
|
|
reference.
|
|
If I<init_function> is NULL, the provider is assumed to be a
|
|
dynamically loadable module, with the symbol B<OSSL_provider_init> as
|
|
its initialisation function.
|
|
If I<init_function> isn't NULL, the provider is assumed to be built
|
|
in, with I<init_function> being the pointer to its initialisation
|
|
function.
|
|
For further description of the initialisation function, see the
|
|
description of ossl_provider_activate() below.
|
|
|
|
ossl_provider_up_ref() increments the provider object I<prov>'s
|
|
reference count.
|
|
|
|
ossl_provider_free() decrements the provider object I<prov>'s
|
|
reference count; when it drops to zero, the provider object is assumed
|
|
to have fallen out of use and will be deinitialized (its I<teardown>
|
|
function is called), and the associated module will be unloaded if one
|
|
was loaded, and I<prov> itself will be freed.
|
|
|
|
ossl_provider_set_fallback() marks an available provider I<prov> as
|
|
fallback.
|
|
Note that after this call, the provider object pointer that was
|
|
used can simply be dropped, but not freed.
|
|
|
|
ossl_provider_set_module_path() sets the module path to load the
|
|
provider module given the provider object I<prov>.
|
|
This will be used in preference to automatically trying to figure out
|
|
the path from the provider name and the default module directory (more
|
|
on this in L</NOTES>).
|
|
|
|
ossl_provider_libctx() returns the library context the given
|
|
provider I<prov> is registered in.
|
|
|
|
ossl_provider_add_parameter() adds a global parameter for the provider
|
|
to retrieve as it sees fit.
|
|
The parameters are a combination of I<name> and I<value>, and the
|
|
provider will use the name to find the value it wants.
|
|
Only text parameters can be given, and it's up to the provider to
|
|
interpret them.
|
|
|
|
ossl_provider_set_child() marks this provider as a child of a provider in the
|
|
parent library context. I<handle> is the B<OSSL_CORE_HANDLE> object passed to
|
|
the provider's B<OSSL_provider_init> function.
|
|
|
|
ossl_provider_get_parent() obtains the handle on the parent provider.
|
|
|
|
ossl_provider_up_ref_parent() increases the reference count on the parent
|
|
provider. If I<activate> is nonzero then the parent provider is also activated.
|
|
|
|
ossl_provider_free_parent() decreases the reference count on the parent
|
|
provider. If I<deactivate> is nonzero then the parent provider is also
|
|
deactivated.
|
|
|
|
ossl_provider_default_props_update() is responsible for informing any child
|
|
providers of an update to the default properties. The new properties are
|
|
supplied in the I<props> string.
|
|
|
|
ossl_provider_activate() "activates" the provider for the given
|
|
provider object I<prov> by incrementing its activation count, flagging
|
|
it as activated, and initializing it if it isn't already initialized.
|
|
Initializing means one of the following:
|
|
|
|
=over 4
|
|
|
|
=item *
|
|
|
|
If an initialization function was given with ossl_provider_new(), that
|
|
function will get called.
|
|
|
|
=item *
|
|
|
|
If no initialization function was given with ossl_provider_new(), a
|
|
loadable module with the I<name> that was given to ossl_provider_new()
|
|
will be located and loaded, then the symbol B<OSSL_provider_init> will
|
|
be located in that module, and called.
|
|
|
|
=back
|
|
|
|
If I<retain_fallbacks> is zero, fallbacks are disabled. If it is nonzero,
|
|
fallbacks are left unchanged. If I<upcalls> is nonzero then, if this is a child
|
|
provider, upcalls to the parent libctx will be made to inform it of an
|
|
up-ref.
|
|
|
|
ossl_provider_deactivate() "deactivates" the provider for the given
|
|
provider object I<prov> by decrementing its activation count. When
|
|
that count reaches zero, the activation flag is cleared.
|
|
|
|
ossl_provider_available() activates all fallbacks if no provider is
|
|
activated yet, then checks if given provider object I<prov> is
|
|
activated.
|
|
|
|
ossl_provider_ctx() returns a context created by the provider.
|
|
Outside of the provider, it's completely opaque, but it needs to be
|
|
passed back to some of the provider functions.
|
|
|
|
ossl_provider_get0_dispatch() returns the dispatch table that the provider
|
|
initially returned in the I<out> parameter of its B<OSSL_provider_init>
|
|
function.
|
|
|
|
ossl_provider_doall_activated() iterates over all the currently
|
|
"activated" providers, and calls I<cb> for each of them.
|
|
If no providers have been "activated" yet, it tries to activate all
|
|
available fallback providers before iterating over them.
|
|
|
|
ossl_provider_name() returns the name that was given with
|
|
ossl_provider_new().
|
|
|
|
ossl_provider_dso() returns a reference to the module, for providers
|
|
that come in the form of loadable modules.
|
|
|
|
ossl_provider_module_name() returns the filename of the module, for
|
|
providers that come in the form of loadable modules.
|
|
|
|
ossl_provider_module_path() returns the full path of the module file,
|
|
for providers that come in the form of loadable modules.
|
|
|
|
ossl_provider_teardown() calls the provider's I<teardown> function, if
|
|
the provider has one.
|
|
|
|
ossl_provider_gettable_params() calls the provider's I<gettable_params>
|
|
function, if the provider has one.
|
|
It should return an array of I<OSSL_PARAM> to describe all the
|
|
parameters that the provider has for the provider object.
|
|
|
|
ossl_provider_get_params() calls the provider's parameter request
|
|
responder.
|
|
It should treat the given I<OSSL_PARAM> array as described in
|
|
L<OSSL_PARAM(3)>.
|
|
|
|
ossl_provider_get_capabilities() calls the provider's I<get_capabilities> function,
|
|
if the provider has one. It provides the name of the I<capability> and a
|
|
callback I<cb> parameter to call for each capability that has a matching name in
|
|
the provider. The callback gets passed OSSL_PARAM details about the capability as
|
|
well as the caller supplied argument I<arg>.
|
|
|
|
ossl_provider_query_operation() calls the provider's
|
|
I<query_operation> function, if the provider has one.
|
|
It should return an array of I<OSSL_ALGORITHM> for the given
|
|
I<operation_id>.
|
|
|
|
ossl_provider_unquery_operation() informs the provider that the result of
|
|
ossl_provider_query_operation() is no longer going to be directly accessed and
|
|
that all relevant information has been copied.
|
|
|
|
ossl_provider_set_operation_bit() registers a 1 for operation I<bitnum>
|
|
in a bitstring that's internal to I<provider>.
|
|
|
|
ossl_provider_test_operation_bit() checks if the bit operation I<bitnum>
|
|
is set (1) or not (0) in the internal I<provider> bitstring, and sets
|
|
I<*result> to 1 or 0 accorddingly.
|
|
|
|
ossl_provider_clear_all_operation_bits() clears all of the operation bits
|
|
to (0) for all providers in the library context I<libctx>.
|
|
|
|
ossl_provider_init_as_child() stores in the library context I<ctx> references to
|
|
the necessary upcalls for managing child providers. The I<handle> and I<in>
|
|
parameters are the B<OSSL_CORE_HANDLE> and B<OSSL_DISPATCH> pointers that were
|
|
passed to the provider's B<OSSL_provider_init> function.
|
|
|
|
=head1 NOTES
|
|
|
|
Locating a provider module happens as follows:
|
|
|
|
=over 4
|
|
|
|
=item 1.
|
|
|
|
If a path was given with ossl_provider_set_module_path(), use that as
|
|
module path.
|
|
Otherwise, use the provider object's name as module path, with
|
|
platform specific standard extensions added.
|
|
|
|
=item 2.
|
|
|
|
If the environment variable B<OPENSSL_MODULES> is defined, assume its
|
|
value is a directory specification and merge it with the module path.
|
|
Otherwise, merge the value of the OpenSSL built in macro B<MODULESDIR>
|
|
with the module path.
|
|
|
|
=back
|
|
|
|
When this process is done, the result is used when trying to load the
|
|
provider module.
|
|
|
|
The command C<openssl version -m> can be used to find out the value
|
|
of the built in macro B<MODULESDIR>.
|
|
|
|
=head1 RETURN VALUES
|
|
|
|
ossl_provider_find() and ossl_provider_new() return a pointer to a
|
|
provider object (I<OSSL_PROVIDER>) on success, or NULL on error.
|
|
|
|
ossl_provider_up_ref() returns the value of the reference count after
|
|
it has been incremented.
|
|
|
|
ossl_provider_free() doesn't return any value.
|
|
|
|
ossl_provider_doall_activated() returns 1 if the callback was called for all
|
|
activated providers. A return value of 0 means that the callback was not
|
|
called for any activated providers.
|
|
|
|
ossl_provider_set_module_path(), ossl_provider_set_fallback(),
|
|
ossl_provider_activate(), ossl_provider_activate_leave_fallbacks() and
|
|
ossl_provider_deactivate(), ossl_provider_default_props_update() return 1 on
|
|
success, or 0 on error.
|
|
|
|
ossl_provider_available() return 1 if the provider is available,
|
|
otherwise 0.
|
|
|
|
ossl_provider_name(), ossl_provider_dso(),
|
|
ossl_provider_module_name(), and ossl_provider_module_path() return a
|
|
pointer to their respective data if it's available, otherwise NULL
|
|
is returned.
|
|
|
|
ossl_provider_libctx() return a pointer to the library context.
|
|
This may be NULL, and is perfectly valid, as it denotes the default
|
|
global library context.
|
|
|
|
ossl_provider_teardown() doesn't return any value.
|
|
|
|
ossl_provider_gettable_params() returns a pointer to a constant
|
|
I<OSSL_PARAM> array if this function is available in the provider,
|
|
otherwise NULL.
|
|
|
|
ossl_provider_get_params() returns 1 on success, or 0 on error.
|
|
If this function isn't available in the provider, 0 is returned.
|
|
|
|
ossl_provider_set_operation_bit() and ossl_provider_test_operation_bit()
|
|
return 1 on success, or 0 on error.
|
|
|
|
ossl_provider_clear_all_operation_bits() returns 1 on success, or 0 on error.
|
|
|
|
ossl_provider_get_capabilities() returns 1 on success, or 0 on error.
|
|
If this function isn't available in the provider or the provider does not
|
|
support the requested capability then 0 is returned.
|
|
|
|
=head1 SEE ALSO
|
|
|
|
L<OSSL_PROVIDER(3)>, L<provider(7)>, L<openssl(1)>
|
|
|
|
=head1 HISTORY
|
|
|
|
The functions described here were all added in OpenSSL 3.0.
|
|
|
|
=head1 COPYRIGHT
|
|
|
|
Copyright 2019-2021 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
|
|
L<https://www.openssl.org/source/license.html>.
|
|
|
|
=cut
|