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While stereotyped repetitions are frowned upon in literature, they serve a useful purpose in manual pages, because it is easier for the user to find certain information if it is always presented in the same way. For that reason, this commit harmonizes the varying formulations in the HISTORY section about which functions, flags, etc. were added in which OpenSSL version. It also attempts to make the pod files more grep friendly by avoiding to insert line breaks between the symbol names and the corresponding version number in which they were introduced (wherever possible). Some punctuation and typographical errors were fixed on the way. Reviewed-by: Tim Hudson <tjh@openssl.org> (Merged from https://github.com/openssl/openssl/pull/7854)
162 lines
6.1 KiB
Plaintext
162 lines
6.1 KiB
Plaintext
=pod
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=head1 NAME
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OSSL_STORE_CTX, OSSL_STORE_post_process_info_fn, OSSL_STORE_open,
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OSSL_STORE_ctrl, OSSL_STORE_load, OSSL_STORE_eof, OSSL_STORE_error,
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OSSL_STORE_close - Types and functions to read objects from a URI
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=head1 SYNOPSIS
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#include <openssl/store.h>
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typedef struct ossl_store_ctx_st OSSL_STORE_CTX;
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typedef OSSL_STORE_INFO *(*OSSL_STORE_post_process_info_fn)(OSSL_STORE_INFO *,
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void *);
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OSSL_STORE_CTX *OSSL_STORE_open(const char *uri, const UI_METHOD *ui_method,
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void *ui_data,
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OSSL_STORE_post_process_info_fn post_process,
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void *post_process_data);
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int OSSL_STORE_ctrl(OSSL_STORE_CTX *ctx, int cmd, ... /* args */);
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OSSL_STORE_INFO *OSSL_STORE_load(OSSL_STORE_CTX *ctx);
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int OSSL_STORE_eof(OSSL_STORE_CTX *ctx);
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int OSSL_STORE_error(OSSL_STORE_CTX *ctx);
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int OSSL_STORE_close(OSSL_STORE_CTX *ctx);
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=head1 DESCRIPTION
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These functions help the application to fetch supported objects (see
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L<OSSL_STORE_INFO(3)/SUPPORTED OBJECTS> for information on which those are)
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from a given URI (see L</SUPPORTED SCHEMES> for more information on
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the supported URI schemes).
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The general method to do so is to "open" the URI using OSSL_STORE_open(),
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read each available and supported object using OSSL_STORE_load() as long as
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OSSL_STORE_eof() hasn't been reached, and finish it off with OSSL_STORE_close().
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The retrieved information is stored in a B<OSSL_STORE_INFO>, which is further
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described in L<OSSL_STORE_INFO(3)>.
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=head2 Types
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B<OSSL_STORE_CTX> is a context variable that holds all the internal
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information for OSSL_STORE_open(), OSSL_STORE_load(), OSSL_STORE_eof() and
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OSSL_STORE_close() to work together.
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=head2 Functions
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OSSL_STORE_open() takes a uri or path B<uri>, password UI method
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B<ui_method> with associated data B<ui_data>, and post processing
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callback B<post_process> with associated data B<post_process_data>,
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opens a channel to the data located at that URI and returns a
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B<OSSL_STORE_CTX> with all necessary internal information.
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The given B<ui_method> and B<ui_data_data> will be reused by all
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functions that use B<OSSL_STORE_CTX> when interaction is needed.
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The given B<post_process> and B<post_process_data> will be reused by
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OSSL_STORE_load() to manipulate or drop the value to be returned.
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The B<post_process> function drops values by returning B<NULL>, which
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will cause OSSL_STORE_load() to start its process over with loading
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the next object, until B<post_process> returns something other than
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B<NULL>, or the end of data is reached as indicated by OSSL_STORE_eof().
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OSSL_STORE_ctrl() takes a B<OSSL_STORE_CTX>, and command number B<cmd> and
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more arguments not specified here.
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The available loader specific command numbers and arguments they each
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take depends on the loader that's used and is documented together with
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that loader.
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There are also global controls available:
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=over 4
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=item B<OSSL_STORE_C_USE_SECMEM>
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Controls if the loader should attempt to use secure memory for any
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allocated B<OSSL_STORE_INFO> and its contents.
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This control expects one argument, a pointer to an B<int> that is expected to
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have the value 1 (yes) or 0 (no).
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Any other value is an error.
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=back
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OSSL_STORE_load() takes a B<OSSL_STORE_CTX>, tries to load the next available
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object and return it wrapped with B<OSSL_STORE_INFO>.
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OSSL_STORE_eof() takes a B<OSSL_STORE_CTX> and checks if we've reached the end
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of data.
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OSSL_STORE_error() takes a B<OSSL_STORE_CTX> and checks if an error occurred in
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the last OSSL_STORE_load() call.
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Note that it may still be meaningful to try and load more objects, unless
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OSSL_STORE_eof() shows that the end of data has been reached.
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OSSL_STORE_close() takes a B<OSSL_STORE_CTX>, closes the channel that was opened
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by OSSL_STORE_open() and frees all other information that was stored in the
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B<OSSL_STORE_CTX>, as well as the B<OSSL_STORE_CTX> itself.
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=head1 SUPPORTED SCHEMES
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The basic supported scheme is B<file:>.
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Any other scheme can be added dynamically, using
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OSSL_STORE_register_loader().
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=head1 NOTES
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A string without a scheme prefix (that is, a non-URI string) is
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implicitly interpreted as using the F<file:> scheme.
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There are some tools that can be used together with
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OSSL_STORE_open() to determine if any failure is caused by an unparsable
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URI, or if it's a different error (such as memory allocation
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failures); if the URI was parsable but the scheme unregistered, the
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top error will have the reason C<OSSL_STORE_R_UNREGISTERED_SCHEME>.
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These functions make no direct assumption regarding the pass phrase received
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from the password callback.
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The loaders may make assumptions, however.
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For example, the B<file:> scheme loader inherits the assumptions made by
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OpenSSL functionality that handles the different file types; this is mostly
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relevant for PKCS#12 objects.
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See L<passphrase-encoding(7)> for further information.
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=head1 RETURN VALUES
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OSSL_STORE_open() returns a pointer to a B<OSSL_STORE_CTX> on success, or
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B<NULL> on failure.
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OSSL_STORE_load() returns a pointer to a B<OSSL_STORE_INFO> on success, or
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B<NULL> on error or when end of data is reached.
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Use OSSL_STORE_error() and OSSL_STORE_eof() to determine the meaning of a
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returned B<NULL>.
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OSSL_STORE_eof() returns 1 if the end of data has been reached, otherwise
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0.
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OSSL_STORE_error() returns 1 if an error occurred in an OSSL_STORE_load() call,
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otherwise 0.
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OSSL_STORE_ctrl() and OSSL_STORE_close() returns 1 on success, or 0 on failure.
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=head1 SEE ALSO
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L<ossl_store(7)>, L<OSSL_STORE_INFO(3)>, L<OSSL_STORE_register_loader(3)>,
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L<passphrase-encoding(7)>
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=head1 HISTORY
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OSSL_STORE_CTX(), OSSL_STORE_post_process_info_fn(), OSSL_STORE_open(),
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OSSL_STORE_ctrl(), OSSL_STORE_load(), OSSL_STORE_eof() and OSSL_STORE_close()
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were added in OpenSSL 1.1.1.
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=head1 COPYRIGHT
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Copyright 2016-2018 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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