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The types OSSL_DISPATCH, OSSL_ITEM, OSSL_ALGORITHM, OSSL_PARAM, OSSL_CALLBACK, and OSSL_PASSPHRASE_CALLBACK are described in their own manual page, so we change every mention of them to links to those pages. Reviewed-by: Hugo Landau <hlandau@openssl.org> Reviewed-by: Tomas Mraz <tomas@openssl.org> (Merged from https://github.com/openssl/openssl/pull/19842)
199 lines
7.5 KiB
Plaintext
199 lines
7.5 KiB
Plaintext
=pod
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=head1 NAME
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provider-storemgmt - The OSSL_STORE library E<lt>-E<gt> provider functions
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=head1 SYNOPSIS
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#include <openssl/core_dispatch.h>
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/*
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* None of these are actual functions, but are displayed like this for
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* the function signatures for functions that are offered as function
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* pointers in OSSL_DISPATCH arrays.
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*/
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void *OSSL_FUNC_store_open(void *provctx, const char *uri);
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void *OSSL_FUNC_store_attach(void *provctx, OSSL_CORE_BIO *bio);
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const OSSL_PARAM *store_settable_ctx_params(void *provctx);
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int OSSL_FUNC_store_set_ctx_params(void *loaderctx, const OSSL_PARAM[]);
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int OSSL_FUNC_store_load(void *loaderctx,
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OSSL_CALLBACK *object_cb, void *object_cbarg,
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OSSL_PASSPHRASE_CALLBACK *pw_cb, void *pw_cbarg);
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int OSSL_FUNC_store_eof(void *loaderctx);
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int OSSL_FUNC_store_close(void *loaderctx);
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int OSSL_FUNC_store_export_object
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(void *loaderctx, const void *objref, size_t objref_sz,
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OSSL_CALLBACK *export_cb, void *export_cbarg);
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=head1 DESCRIPTION
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The STORE operation is the provider side of the L<ossl_store(7)> API.
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The primary responsibility of the STORE operation is to load all sorts
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of objects from a container indicated by URI. These objects are given
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to the OpenSSL library in provider-native object abstraction form (see
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L<provider-object(7)>). The OpenSSL library is then responsible for
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passing on that abstraction to suitable provided functions.
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Examples of functions that the OpenSSL library can pass the abstraction to
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include OSSL_FUNC_keymgmt_load() (L<provider-keymgmt(7)>),
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OSSL_FUNC_store_export_object() (which exports the object in parameterized
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form).
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All "functions" mentioned here are passed as function pointers between
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F<libcrypto> and the provider in L<OSSL_DISPATCH(3)> arrays via
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L<OSSL_ALGORITHM(3)> arrays that are returned by the provider's
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provider_query_operation() function
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(see L<provider-base(7)/Provider Functions>).
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All these "functions" have a corresponding function type definition named
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B<OSSL_FUNC_{name}_fn>, and a helper function to retrieve the function pointer
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from a L<OSSL_DISPATCH(3)> element named B<OSSL_get_{name}>.
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For example, the "function" OSSL_FUNC_store_attach() has these:
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typedef void *(OSSL_FUNC_store_attach_fn)(void *provctx,
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OSSL_CORE_BIO * bio);
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static ossl_inline OSSL_FUNC_store_attach_fn
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OSSL_FUNC_store_attach(const OSSL_DISPATCH *opf);
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L<OSSL_DISPATCH(3)> arrays are indexed by numbers that are provided as macros
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in L<openssl-core_dispatch.h(7)>, as follows:
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OSSL_FUNC_store_open OSSL_FUNC_STORE_OPEN
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OSSL_FUNC_store_attach OSSL_FUNC_STORE_ATTACH
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OSSL_FUNC_store_settable_ctx_params OSSL_FUNC_STORE_SETTABLE_CTX_PARAMS
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OSSL_FUNC_store_set_ctx_params OSSL_FUNC_STORE_SET_CTX_PARAMS
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OSSL_FUNC_store_load OSSL_FUNC_STORE_LOAD
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OSSL_FUNC_store_eof OSSL_FUNC_STORE_EOF
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OSSL_FUNC_store_close OSSL_FUNC_STORE_CLOSE
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OSSL_FUNC_store_export_object OSSL_FUNC_STORE_EXPORT_OBJECT
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=head2 Functions
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OSSL_FUNC_store_open() should create a provider side context with data based
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on the input I<uri>. The implementation is entirely responsible for the
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interpretation of the URI.
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OSSL_FUNC_store_attach() should create a provider side context with the core
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B<BIO> I<bio> attached. This is an alternative to using a URI to find storage,
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supporting L<OSSL_STORE_attach(3)>.
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OSSL_FUNC_store_settable_ctx_params() should return a constant array of
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descriptor L<OSSL_PARAM(3)>, for parameters that OSSL_FUNC_store_set_ctx_params()
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can handle.
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OSSL_FUNC_store_set_ctx_params() should set additional parameters, such as what
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kind of data to expect, search criteria, and so on. More on those below, in
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L</Load Parameters>. Whether unrecognised parameters are an error or simply
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ignored is at the implementation's discretion.
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Passing NULL for I<params> should return true.
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OSSL_FUNC_store_load() loads the next object from the URI opened by
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OSSL_FUNC_store_open(), creates an object abstraction for it (see
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L<provider-object(7)>), and calls I<object_cb> with it as well as
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I<object_cbarg>. I<object_cb> will then interpret the object abstraction
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and do what it can to wrap it or decode it into an OpenSSL structure. In
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case a passphrase needs to be prompted to unlock an object, I<pw_cb> should
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be called.
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OSSL_FUNC_store_eof() indicates if the end of the set of objects from the
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URI has been reached. When that happens, there's no point trying to do any
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further loading.
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OSSL_FUNC_store_close() frees the provider side context I<ctx>.
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When a provider-native object is created by a store manager it would be unsuitable
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for direct use with a foreign provider. The export function allows for
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exporting the object to that foreign provider if the foreign provider
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supports the type of the object and provides an import function.
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OSSL_FUNC_store_export_object() should export the object of size I<objref_sz>
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referenced by I<objref> as an L<OSSL_PARAM(3)> array and pass that to the
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I<export_cb> as well as the given I<export_cbarg>.
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=head2 Load Parameters
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=over 4
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=item "expect" (B<OSSL_STORE_PARAM_EXPECT>) <integer>
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Is a hint of what type of data the OpenSSL library expects to get.
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This is only useful for optimization, as the library will check that the
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object types match the expectation too.
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The number that can be given through this parameter is found in
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F<< <openssl/store.h> >>, with the macros having names starting with
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C<OSSL_STORE_INFO_>. These are further described in
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L<OSSL_STORE_INFO(3)/SUPPORTED OBJECTS>.
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=item "subject" (B<OSSL_STORE_PARAM_SUBJECT>) <octet string>
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Indicates that the caller wants to search for an object with the given
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subject associated. This can be used to select specific certificates
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by subject.
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The contents of the octet string is expected to be in DER form.
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=item "issuer" (B<OSSL_STORE_PARAM_ISSUER>) <octet string>
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Indicates that the caller wants to search for an object with the given
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issuer associated. This can be used to select specific certificates
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by issuer.
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The contents of the octet string is expected to be in DER form.
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=item "serial" (B<OSSL_STORE_PARAM_SERIAL>) <integer>
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Indicates that the caller wants to search for an object with the given
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serial number associated.
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=item "digest" (B<OSSL_STORE_PARAM_DIGEST>) <UTF8 string>
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=item "fingerprint" (B<OSSL_STORE_PARAM_FINGERPRINT>) <octet string>
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Indicates that the caller wants to search for an object with the given
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fingerprint, computed with the given digest.
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=item "alias" (B<OSSL_STORE_PARAM_ALIAS>) <UTF8 string>
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Indicates that the caller wants to search for an object with the given
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alias (some call it a "friendly name").
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=item "properties" (B<OSSL_STORE_PARAM_PROPERTIES) <utf8 string>
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Property string to use when querying for algorithms such as the B<OSSL_DECODER>
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decoder implementations.
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=item "input-type" (B<OSSL_STORE_PARAM_INPUT_TYPE) <utf8 string>
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Type of the input format as a hint to use when decoding the objects in the
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store.
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=back
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Several of these search criteria may be combined. For example, to
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search for a certificate by issuer+serial, both the "issuer" and the
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"serial" parameters will be given.
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=head1 SEE ALSO
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L<provider(7)>
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=head1 HISTORY
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The STORE interface was introduced in OpenSSL 3.0.
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=head1 COPYRIGHT
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Copyright 2020-2021 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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