1OSSL_STORE_OPEN(3ossl) OpenSSL OSSL_STORE_OPEN(3ossl)
2
6 OSSL_STORE_CTX, OSSL_STORE_post_process_info_fn, OSSL_STORE_open,
7 OSSL_STORE_open_ex, OSSL_STORE_ctrl, OSSL_STORE_load, OSSL_STORE_eof,
8 OSSL_STORE_error, OSSL_STORE_close - Types and functions to read
9 objects from a URI
10
12 #include <openssl/store.h>
13 typedef struct ossl_store_ctx_st OSSL_STORE_CTX;
15 typedef OSSL_STORE_INFO *(*OSSL_STORE_post_process_info_fn)(OSSL_STORE_INFO *,
17 void *);
18 OSSL_STORE_CTX *OSSL_STORE_open(const char *uri, const UI_METHOD *ui_method,
20 void *ui_data,
21 OSSL_STORE_post_process_info_fn post_process,
22 void *post_process_data);
23 OSSL_STORE_CTX *
24 OSSL_STORE_open_ex(const char *uri, OSSL_LIB_CTX *libctx, const char *propq,
25 const UI_METHOD *ui_method, void *ui_data,
26 const OSSL_PARAM params[],
27 OSSL_STORE_post_process_info_fn post_process,
28 void *post_process_data);
29 OSSL_STORE_INFO *OSSL_STORE_load(OSSL_STORE_CTX *ctx);
31 int OSSL_STORE_eof(OSSL_STORE_CTX *ctx);
32 int OSSL_STORE_error(OSSL_STORE_CTX *ctx);
33 int OSSL_STORE_close(OSSL_STORE_CTX *ctx);
34 The following function has been deprecated since OpenSSL 3.0, and can
36 be hidden entirely by defining OPENSSL_API_COMPAT with a suitable
37 version value, see openssl_user_macros(7):
38 int OSSL_STORE_ctrl(OSSL_STORE_CTX *ctx, int cmd, ... /* args */);
40
42 These functions help the application to fetch supported objects (see
43 "SUPPORTED OBJECTS" in OSSL_STORE_INFO(3) for information on which
44 those are) from a given URI. The general method to do so is to "open"
45 the URI using OSSL_STORE_open(), read each available and supported
46 object using OSSL_STORE_load() as long as OSSL_STORE_eof() hasn't been
47 reached, and finish it off with OSSL_STORE_close().
48 The retrieved information is stored in a OSSL_STORE_INFO, which is
50 further described in OSSL_STORE_INFO(3).
51 Types
53 OSSL_STORE_CTX is a context variable that holds all the internal
54 information for OSSL_STORE_open(), OSSL_STORE_open_ex(),
55 OSSL_STORE_load(), OSSL_STORE_eof() and OSSL_STORE_close() to work
56 together.
57 Functions
59 OSSL_STORE_open_ex() takes a uri or path uri, password UI method
60 ui_method with associated data ui_data, and post processing callback
61 post_process with associated data post_process_data, a library context
62 libctx with an associated property query propq, and opens a channel to
63 the data located at the URI and returns a OSSL_STORE_CTX with all
64 necessary internal information. The given ui_method and ui_data will
65 be reused by all functions that use OSSL_STORE_CTX when interaction is
66 needed, for instance to provide a password. The auxiliary OSSL_PARAM
67 parameters in params can be set to further modify the store operation.
68 The given post_process and post_process_data will be reused by
69 OSSL_STORE_load() to manipulate or drop the value to be returned. The
70 post_process function drops values by returning NULL, which will cause
71 OSSL_STORE_load() to start its process over with loading the next
72 object, until post_process returns something other than NULL, or the
73 end of data is reached as indicated by OSSL_STORE_eof().
74 OSSL_STORE_open() is similar to OSSL_STORE_open_ex() but uses NULL for
76 the params, the library context libctx and property query propq.
77 OSSL_STORE_ctrl() takes a OSSL_STORE_CTX, and command number cmd and
79 more arguments not specified here. The available loader specific
80 command numbers and arguments they each take depends on the loader
81 that's used and is documented together with that loader.
82 There are also global controls available:
84 OSSL_STORE_C_USE_SECMEM
86 Controls if the loader should attempt to use secure memory for any
87 allocated OSSL_STORE_INFO and its contents. This control expects
88 one argument, a pointer to an int that is expected to have the
89 value 1 (yes) or 0 (no). Any other value is an error.
90 OSSL_STORE_load() takes a OSSL_STORE_CTX and tries to load the next
92 available object and return it wrapped with OSSL_STORE_INFO.
93 OSSL_STORE_eof() takes a OSSL_STORE_CTX and checks if we've reached the
95 end of data.
96 OSSL_STORE_error() takes a OSSL_STORE_CTX and checks if an error
98 occurred in the last OSSL_STORE_load() call. Note that it may still be
99 meaningful to try and load more objects, unless OSSL_STORE_eof() shows
100 that the end of data has been reached.
101 OSSL_STORE_close() takes a OSSL_STORE_CTX, closes the channel that was
103 opened by OSSL_STORE_open() and frees all other information that was
104 stored in the OSSL_STORE_CTX, as well as the OSSL_STORE_CTX itself. If
105 ctx is NULL it does nothing.
106
108 A string without a scheme prefix (that is, a non-URI string) is
109 implicitly interpreted as using the file: scheme.
110 There are some tools that can be used together with OSSL_STORE_open()
112 to determine if any failure is caused by an unparsable URI, or if it's
113 a different error (such as memory allocation failures); if the URI was
114 parsable but the scheme unregistered, the top error will have the
115 reason "OSSL_STORE_R_UNREGISTERED_SCHEME".
116 These functions make no direct assumption regarding the pass phrase
118 received from the password callback. The loaders may make assumptions,
119 however. For example, the file: scheme loader inherits the assumptions
120 made by OpenSSL functionality that handles the different file types;
121 this is mostly relevant for PKCS#12 objects. See
122 passphrase-encoding(7) for further information.
123
125 OSSL_STORE_open() returns a pointer to a OSSL_STORE_CTX on success, or
126 NULL on failure.
127 OSSL_STORE_load() returns a pointer to a OSSL_STORE_INFO on success, or
129 NULL on error or when end of data is reached. Use OSSL_STORE_error()
130 and OSSL_STORE_eof() to determine the meaning of a returned NULL.
131 OSSL_STORE_eof() returns 1 if the end of data has been reached or an
133 error occurred, 0 otherwise.
134 OSSL_STORE_error() returns 1 if an error occurred in an
136 OSSL_STORE_load() call, otherwise 0.
137 OSSL_STORE_ctrl() and OSSL_STORE_close() returns 1 on success, or 0 on
139 failure.
140
142 ossl_store(7), OSSL_STORE_INFO(3), OSSL_STORE_register_loader(3),
143 passphrase-encoding(7)
144
146 OSSL_STORE_open_ex() was added in OpenSSL 3.0.
147 OSSL_STORE_CTX, OSSL_STORE_post_process_info_fn(), OSSL_STORE_open(),
149 OSSL_STORE_ctrl(), OSSL_STORE_load(), OSSL_STORE_eof() and
150 OSSL_STORE_close() were added in OpenSSL 1.1.1.
151 Handling of NULL ctx argument for OSSL_STORE_close() was introduced in
153 OpenSSL 1.1.1h.
154 OSSL_STORE_open_ex() was added in OpenSSL 3.0.
156 OSSL_STORE_ctrl() and OSSL_STORE_vctrl() were deprecated in OpenSSL
158 3.0.
159
161 Copyright 2016-2021 The OpenSSL Project Authors. All Rights Reserved.
162 Licensed under the Apache License 2.0 (the "License"). You may not use
164 this file except in compliance with the License. You can obtain a copy
165 in the file LICENSE in the source distribution or at
166 <https://www.openssl.org/source/license.html>.
1673.0.5 2022-07-05 OSSL_STORE_OPEN(3ossl)