Make it possible to tell the file loader to use secure memory
[openssl.git] / include / openssl / store.h
1 /*
2  * Copyright 2016-2017 The OpenSSL Project Authors. All Rights Reserved.
3  *
4  * Licensed under the OpenSSL license (the "License").  You may not use
5  * this file except in compliance with the License.  You can obtain a copy
6  * in the file LICENSE in the source distribution or at
7  * https://www.openssl.org/source/license.html
8  */
9
10 #ifndef HEADER_OSSL_STORE_H
11 # define HEADER_OSSL_STORE_H
12
13 # include <stdarg.h>
14 # include <openssl/ossl_typ.h>
15 # include <openssl/pem.h>
16 # include <openssl/storeerr.h>
17
18 # ifdef  __cplusplus
19 extern "C" {
20 # endif
21
22 /*-
23  *  The main OSSL_STORE functions.
24  *  ------------------------------
25  *
26  *  These allow applications to open a channel to a resource with supported
27  *  data (keys, certs, crls, ...), read the data a piece at a time and decide
28  *  what to do with it, and finally close.
29  */
30
31 typedef struct ossl_store_ctx_st OSSL_STORE_CTX;
32
33 /*
34  * Typedef for the OSSL_STORE_INFO post processing callback.  This can be used
35  * to massage the given OSSL_STORE_INFO, or to drop it entirely (by returning
36  * NULL).
37  */
38 typedef OSSL_STORE_INFO *(*OSSL_STORE_post_process_info_fn)(OSSL_STORE_INFO *,
39                                                             void *);
40
41 /*
42  * Open a channel given a URI.  The given UI method will be used any time the
43  * loader needs extra input, for example when a password or pin is needed, and
44  * will be passed the same user data every time it's needed in this context.
45  *
46  * Returns a context reference which represents the channel to communicate
47  * through.
48  */
49 OSSL_STORE_CTX *OSSL_STORE_open(const char *uri, const UI_METHOD *ui_method,
50                                 void *ui_data,
51                                 OSSL_STORE_post_process_info_fn post_process,
52                                 void *post_process_data);
53
54 /*
55  * Control / fine tune the OSSL_STORE channel.  |cmd| determines what is to be
56  * done, and depends on the underlying loader (use OSSL_STORE_get0_scheme to
57  * determine which loader is used), except for common commands (see below).
58  * Each command takes different arguments.
59  */
60 int OSSL_STORE_ctrl(OSSL_STORE_CTX *ctx, int cmd, ... /* args */);
61
62 /*
63  * Common ctrl commands that different loaders may choose to support.
64  */
65 /* int on = 0 or 1; STORE_ctrl(ctx, STORE_C_USE_SECMEM, &on); */
66 # define OSSL_STORE_C_USE_SECMEM      1
67 /* Where custom commands start */
68 # define OSSL_STORE_C_CUSTOM_START    100
69
70 /*
71  * Read one data item (a key, a cert, a CRL) that is supported by the OSSL_STORE
72  * functionality, given a context.
73  * Returns a OSSL_STORE_INFO pointer, from which OpenSSL typed data can be
74  * extracted with OSSL_STORE_INFO_get0_PKEY(), OSSL_STORE_INFO_get0_CERT(), ...
75  * NULL is returned on error, which may include that the data found at the URI
76  * can't be figured out for certain or is ambiguous.
77  */
78 OSSL_STORE_INFO *OSSL_STORE_load(OSSL_STORE_CTX *ctx);
79
80 /*
81  * Check if end of data (end of file) is reached
82  * Returns 1 on end, 0 otherwise.
83  */
84 int OSSL_STORE_eof(OSSL_STORE_CTX *ctx);
85
86 /*
87  * Check if an error occured
88  * Returns 1 if it did, 0 otherwise.
89  */
90 int OSSL_STORE_error(OSSL_STORE_CTX *ctx);
91
92 /*
93  * Close the channel
94  * Returns 1 on success, 0 on error.
95  */
96 int OSSL_STORE_close(OSSL_STORE_CTX *ctx);
97
98
99 /*-
100  *  Extracting OpenSSL types from and creating new OSSL_STORE_INFOs
101  *  ---------------------------------------------------------------
102  */
103
104 /*
105  * Types of data that can be ossl_stored in a OSSL_STORE_INFO.
106  * OSSL_STORE_INFO_NAME is typically found when getting a listing of
107  * available "files" / "tokens" / what have you.
108  */
109 # define OSSL_STORE_INFO_NAME           1   /* char * */
110 # define OSSL_STORE_INFO_PARAMS         2   /* EVP_PKEY * */
111 # define OSSL_STORE_INFO_PKEY           3   /* EVP_PKEY * */
112 # define OSSL_STORE_INFO_CERT           4   /* X509 * */
113 # define OSSL_STORE_INFO_CRL            5   /* X509_CRL * */
114
115 /*
116  * Functions to generate OSSL_STORE_INFOs, one function for each type we
117  * support having in them.  Along with each of them, one macro that
118  * can be used to determine what types are supported.
119  *
120  * In all cases, ownership of the object is transfered to the OSSL_STORE_INFO
121  * and will therefore be freed when the OSSL_STORE_INFO is freed.
122  */
123 OSSL_STORE_INFO *OSSL_STORE_INFO_new_NAME(char *name);
124 int OSSL_STORE_INFO_set0_NAME_description(OSSL_STORE_INFO *info, char *desc);
125 OSSL_STORE_INFO *OSSL_STORE_INFO_new_PARAMS(EVP_PKEY *params);
126 OSSL_STORE_INFO *OSSL_STORE_INFO_new_PKEY(EVP_PKEY *pkey);
127 OSSL_STORE_INFO *OSSL_STORE_INFO_new_CERT(X509 *x509);
128 OSSL_STORE_INFO *OSSL_STORE_INFO_new_CRL(X509_CRL *crl);
129
130 /*
131  * Functions to try to extract data from a OSSL_STORE_INFO.
132  */
133 int OSSL_STORE_INFO_get_type(const OSSL_STORE_INFO *info);
134 const char *OSSL_STORE_INFO_get0_NAME(const OSSL_STORE_INFO *info);
135 char *OSSL_STORE_INFO_get1_NAME(const OSSL_STORE_INFO *info);
136 const char *OSSL_STORE_INFO_get0_NAME_description(const OSSL_STORE_INFO *info);
137 char *OSSL_STORE_INFO_get1_NAME_description(const OSSL_STORE_INFO *info);
138 EVP_PKEY *OSSL_STORE_INFO_get0_PARAMS(const OSSL_STORE_INFO *info);
139 EVP_PKEY *OSSL_STORE_INFO_get1_PARAMS(const OSSL_STORE_INFO *info);
140 EVP_PKEY *OSSL_STORE_INFO_get0_PKEY(const OSSL_STORE_INFO *info);
141 EVP_PKEY *OSSL_STORE_INFO_get1_PKEY(const OSSL_STORE_INFO *info);
142 X509 *OSSL_STORE_INFO_get0_CERT(const OSSL_STORE_INFO *info);
143 X509 *OSSL_STORE_INFO_get1_CERT(const OSSL_STORE_INFO *info);
144 X509_CRL *OSSL_STORE_INFO_get0_CRL(const OSSL_STORE_INFO *info);
145 X509_CRL *OSSL_STORE_INFO_get1_CRL(const OSSL_STORE_INFO *info);
146
147 const char *OSSL_STORE_INFO_type_string(int type);
148
149 /*
150  * Free the OSSL_STORE_INFO
151  */
152 void OSSL_STORE_INFO_free(OSSL_STORE_INFO *info);
153
154
155 /*-
156  *  Function to register a loader for the given URI scheme.
157  *  -------------------------------------------------------
158  *
159  *  The loader receives all the main components of an URI except for the
160  *  scheme.
161  */
162
163 typedef struct ossl_store_loader_st OSSL_STORE_LOADER;
164 OSSL_STORE_LOADER *OSSL_STORE_LOADER_new(ENGINE *e, const char *scheme);
165 const ENGINE *OSSL_STORE_LOADER_get0_engine(const OSSL_STORE_LOADER *loader);
166 const char *OSSL_STORE_LOADER_get0_scheme(const OSSL_STORE_LOADER *loader);
167 /* struct ossl_store_loader_ctx_st is defined differently by each loader */
168 typedef struct ossl_store_loader_ctx_st OSSL_STORE_LOADER_CTX;
169 typedef OSSL_STORE_LOADER_CTX *(*OSSL_STORE_open_fn)(const OSSL_STORE_LOADER
170                                                      *loader,
171                                                      const char *uri,
172                                                      const UI_METHOD *ui_method,
173                                                      void *ui_data);
174 int OSSL_STORE_LOADER_set_open(OSSL_STORE_LOADER *loader,
175                                OSSL_STORE_open_fn open_function);
176 typedef int (*OSSL_STORE_ctrl_fn)(OSSL_STORE_LOADER_CTX *ctx, int cmd,
177                                   va_list args);
178 int OSSL_STORE_LOADER_set_ctrl(OSSL_STORE_LOADER *loader,
179                                OSSL_STORE_ctrl_fn ctrl_function);
180 typedef OSSL_STORE_INFO *(*OSSL_STORE_load_fn)(OSSL_STORE_LOADER_CTX *ctx,
181                                                const UI_METHOD *ui_method,
182                                                void *ui_data);
183 int OSSL_STORE_LOADER_set_load(OSSL_STORE_LOADER *loader,
184                                OSSL_STORE_load_fn load_function);
185 typedef int (*OSSL_STORE_eof_fn)(OSSL_STORE_LOADER_CTX *ctx);
186 int OSSL_STORE_LOADER_set_eof(OSSL_STORE_LOADER *loader,
187                               OSSL_STORE_eof_fn eof_function);
188 typedef int (*OSSL_STORE_error_fn)(OSSL_STORE_LOADER_CTX *ctx);
189 int OSSL_STORE_LOADER_set_error(OSSL_STORE_LOADER *loader,
190                                 OSSL_STORE_error_fn error_function);
191 typedef int (*OSSL_STORE_close_fn)(OSSL_STORE_LOADER_CTX *ctx);
192 int OSSL_STORE_LOADER_set_close(OSSL_STORE_LOADER *loader,
193                                 OSSL_STORE_close_fn close_function);
194 void OSSL_STORE_LOADER_free(OSSL_STORE_LOADER *loader);
195
196 int OSSL_STORE_register_loader(OSSL_STORE_LOADER *loader);
197 OSSL_STORE_LOADER *OSSL_STORE_unregister_loader(const char *scheme);
198
199 /*-
200  *  Functions to list STORE loaders
201  *  -------------------------------
202  */
203 int OSSL_STORE_do_all_loaders(void (*do_function) (const OSSL_STORE_LOADER
204                                                    *loader, void *do_arg),
205                               void *do_arg);
206
207
208 /*
209  * Error strings
210  */
211 int ERR_load_OSSL_STORE_strings(void);
212
213 # ifdef  __cplusplus
214 }
215 # endif
216 #endif