5 OSSL_STORE_CTX, OSSL_STORE_post_process_info_fn,
6 OSSL_STORE_open, OSSL_STORE_open_ex,
7 OSSL_STORE_ctrl, OSSL_STORE_load, OSSL_STORE_eof,
8 OSSL_STORE_error, OSSL_STORE_close
9 - Types and functions to read objects from a URI
13 #include <openssl/store.h>
15 typedef struct ossl_store_ctx_st OSSL_STORE_CTX;
17 typedef OSSL_STORE_INFO *(*OSSL_STORE_post_process_info_fn)(OSSL_STORE_INFO *,
20 OSSL_STORE_CTX *OSSL_STORE_open(const char *uri, const UI_METHOD *ui_method,
22 OSSL_STORE_post_process_info_fn post_process,
23 void *post_process_data);
25 OSSL_STORE_open_ex(const char *uri, OSSL_LIB_CTX *libctx, const char *propq,
26 const UI_METHOD *ui_method, void *ui_data,
27 const OSSL_PARAM params[],
28 OSSL_STORE_post_process_info_fn post_process,
29 void *post_process_data);
31 OSSL_STORE_INFO *OSSL_STORE_load(OSSL_STORE_CTX *ctx);
32 int OSSL_STORE_eof(OSSL_STORE_CTX *ctx);
33 int OSSL_STORE_error(OSSL_STORE_CTX *ctx);
34 int OSSL_STORE_close(OSSL_STORE_CTX *ctx);
36 The following function has been deprecated since OpenSSL 3.0, and can be
37 hidden entirely by defining B<OPENSSL_API_COMPAT> with a suitable version value,
38 see L<openssl_user_macros(7)>:
40 int OSSL_STORE_ctrl(OSSL_STORE_CTX *ctx, int cmd, ... /* args */);
44 These functions help the application to fetch supported objects (see
45 L<OSSL_STORE_INFO(3)/SUPPORTED OBJECTS> for information on which those are)
47 The general method to do so is to "open" the URI using OSSL_STORE_open(),
48 read each available and supported object using OSSL_STORE_load() as long as
49 OSSL_STORE_eof() hasn't been reached, and finish it off with OSSL_STORE_close().
51 The retrieved information is stored in a B<OSSL_STORE_INFO>, which is further
52 described in L<OSSL_STORE_INFO(3)>.
56 B<OSSL_STORE_CTX> is a context variable that holds all the internal
57 information for OSSL_STORE_open(), OSSL_STORE_open_ex(),
58 OSSL_STORE_load(), OSSL_STORE_eof() and OSSL_STORE_close() to work
63 OSSL_STORE_open_ex() takes a uri or path I<uri>, password UI method
64 I<ui_method> with associated data I<ui_data>, and post processing
65 callback I<post_process> with associated data I<post_process_data>,
66 a library context I<libctx> with an associated property query I<propq>,
67 and opens a channel to the data located at the URI and returns a
68 B<OSSL_STORE_CTX> with all necessary internal information.
69 The given I<ui_method> and I<ui_data> will be reused by all
70 functions that use B<OSSL_STORE_CTX> when interaction is needed,
71 for instance to provide a password.
72 The auxiliary B<OSSL_PARAM> parameters in I<params> can be set to further
73 modify the store operation.
74 The given I<post_process> and I<post_process_data> will be reused by
75 OSSL_STORE_load() to manipulate or drop the value to be returned.
76 The I<post_process> function drops values by returning NULL, which
77 will cause OSSL_STORE_load() to start its process over with loading
78 the next object, until I<post_process> returns something other than
79 NULL, or the end of data is reached as indicated by OSSL_STORE_eof().
81 OSSL_STORE_open() is similar to OSSL_STORE_open_ex() but uses NULL for
82 the I<params>, the library context I<libctx> and property query I<propq>.
84 OSSL_STORE_ctrl() takes a B<OSSL_STORE_CTX>, and command number I<cmd> and
85 more arguments not specified here.
86 The available loader specific command numbers and arguments they each
87 take depends on the loader that's used and is documented together with
90 There are also global controls available:
94 =item B<OSSL_STORE_C_USE_SECMEM>
96 Controls if the loader should attempt to use secure memory for any
97 allocated B<OSSL_STORE_INFO> and its contents.
98 This control expects one argument, a pointer to an I<int> that is expected to
99 have the value 1 (yes) or 0 (no).
100 Any other value is an error.
104 OSSL_STORE_load() takes a B<OSSL_STORE_CTX> and tries to load the next
105 available object and return it wrapped with B<OSSL_STORE_INFO>.
107 OSSL_STORE_eof() takes a B<OSSL_STORE_CTX> and checks if we've reached the end
110 OSSL_STORE_error() takes a B<OSSL_STORE_CTX> and checks if an error occurred in
111 the last OSSL_STORE_load() call.
112 Note that it may still be meaningful to try and load more objects, unless
113 OSSL_STORE_eof() shows that the end of data has been reached.
115 OSSL_STORE_close() takes a B<OSSL_STORE_CTX>, closes the channel that was opened
116 by OSSL_STORE_open() and frees all other information that was stored in the
117 B<OSSL_STORE_CTX>, as well as the B<OSSL_STORE_CTX> itself.
118 If I<ctx> is NULL it does nothing.
122 A string without a scheme prefix (that is, a non-URI string) is
123 implicitly interpreted as using the F<file:> scheme.
125 There are some tools that can be used together with
126 OSSL_STORE_open() to determine if any failure is caused by an unparsable
127 URI, or if it's a different error (such as memory allocation
128 failures); if the URI was parsable but the scheme unregistered, the
129 top error will have the reason C<OSSL_STORE_R_UNREGISTERED_SCHEME>.
131 These functions make no direct assumption regarding the pass phrase received
132 from the password callback.
133 The loaders may make assumptions, however.
134 For example, the B<file:> scheme loader inherits the assumptions made by
135 OpenSSL functionality that handles the different file types; this is mostly
136 relevant for PKCS#12 objects.
137 See L<passphrase-encoding(7)> for further information.
141 OSSL_STORE_open() returns a pointer to a B<OSSL_STORE_CTX> on success, or
144 OSSL_STORE_load() returns a pointer to a B<OSSL_STORE_INFO> on success, or NULL
145 on error or when end of data is reached.
146 Use OSSL_STORE_error() and OSSL_STORE_eof() to determine the meaning of a
149 OSSL_STORE_eof() returns 1 if the end of data has been reached
150 or an error occurred, 0 otherwise.
152 OSSL_STORE_error() returns 1 if an error occurred in an OSSL_STORE_load() call,
155 OSSL_STORE_ctrl() and OSSL_STORE_close() returns 1 on success, or 0 on failure.
159 L<ossl_store(7)>, L<OSSL_STORE_INFO(3)>, L<OSSL_STORE_register_loader(3)>,
160 L<passphrase-encoding(7)>
164 OSSL_STORE_open_ex() was added in OpenSSL 3.0.
166 B<OSSL_STORE_CTX>, OSSL_STORE_post_process_info_fn(), OSSL_STORE_open(),
167 OSSL_STORE_ctrl(), OSSL_STORE_load(), OSSL_STORE_eof() and OSSL_STORE_close()
168 were added in OpenSSL 1.1.1.
170 Handling of NULL I<ctx> argument for OSSL_STORE_close()
171 was introduced in OpenSSL 1.1.1h.
173 OSSL_STORE_open_ex() was added in OpenSSL 3.0.
175 OSSL_STORE_ctrl() and OSSL_STORE_vctrl() were deprecated in OpenSSL 3.0.
179 Copyright 2016-2021 The OpenSSL Project Authors. All Rights Reserved.
181 Licensed under the Apache License 2.0 (the "License"). You may not use
182 this file except in compliance with the License. You can obtain a copy
183 in the file LICENSE in the source distribution or at
184 L<https://www.openssl.org/source/license.html>.