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 /* Where custom commands start */
  66 # define OSSL_STORE_C_CUSTOM_START    100
  67
  68 /*
  69  * Read one data item (a key, a cert, a CRL) that is supported by the OSSL_STORE
  70  * functionality, given a context.
  71  * Returns a OSSL_STORE_INFO pointer, from which OpenSSL typed data can be
  72  * extracted with OSSL_STORE_INFO_get0_PKEY(), OSSL_STORE_INFO_get0_CERT(), ...
  73  * NULL is returned on error, which may include that the data found at the URI
  74  * can't be figured out for certain or is ambiguous.
  75  */
  76 OSSL_STORE_INFO *OSSL_STORE_load(OSSL_STORE_CTX *ctx);
  77
  78 /*
  79  * Check if end of data (end of file) is reached
  80  * Returns 1 on end, 0 otherwise.
  81  */
  82 int OSSL_STORE_eof(OSSL_STORE_CTX *ctx);
  83
  84 /*
  85  * Check if an error occured
  86  * Returns 1 if it did, 0 otherwise.
  87  */
  88 int OSSL_STORE_error(OSSL_STORE_CTX *ctx);
  89
  90 /*
  91  * Close the channel
  92  * Returns 1 on success, 0 on error.
  93  */
  94 int OSSL_STORE_close(OSSL_STORE_CTX *ctx);
  95
  96
  97 /*-
  98  *  Extracting OpenSSL types from and creating new OSSL_STORE_INFOs
  99  *  ---------------------------------------------------------------
 100  */
 101
 102 /*
 103  * Types of data that can be ossl_stored in a OSSL_STORE_INFO.
 104  * OSSL_STORE_INFO_NAME is typically found when getting a listing of
 105  * available "files" / "tokens" / what have you.
 106  */
 107 # define OSSL_STORE_INFO_NAME           1   /* char * */
 108 # define OSSL_STORE_INFO_PARAMS         2   /* EVP_PKEY * */
 109 # define OSSL_STORE_INFO_PKEY           3   /* EVP_PKEY * */
 110 # define OSSL_STORE_INFO_CERT           4   /* X509 * */
 111 # define OSSL_STORE_INFO_CRL            5   /* X509_CRL * */
 112
 113 /*
 114  * Functions to generate OSSL_STORE_INFOs, one function for each type we
 115  * support having in them.  Along with each of them, one macro that
 116  * can be used to determine what types are supported.
 117  *
 118  * In all cases, ownership of the object is transfered to the OSSL_STORE_INFO
 119  * and will therefore be freed when the OSSL_STORE_INFO is freed.
 120  */
 121 OSSL_STORE_INFO *OSSL_STORE_INFO_new_NAME(char *name);
 122 int OSSL_STORE_INFO_set0_NAME_description(OSSL_STORE_INFO *info, char *desc);
 123 OSSL_STORE_INFO *OSSL_STORE_INFO_new_PARAMS(EVP_PKEY *params);
 124 OSSL_STORE_INFO *OSSL_STORE_INFO_new_PKEY(EVP_PKEY *pkey);
 125 OSSL_STORE_INFO *OSSL_STORE_INFO_new_CERT(X509 *x509);
 126 OSSL_STORE_INFO *OSSL_STORE_INFO_new_CRL(X509_CRL *crl);
 127
 128 /*
 129  * Functions to try to extract data from a OSSL_STORE_INFO.
 130  */
 131 int OSSL_STORE_INFO_get_type(const OSSL_STORE_INFO *info);
 132 const char *OSSL_STORE_INFO_get0_NAME(const OSSL_STORE_INFO *info);
 133 char *OSSL_STORE_INFO_get1_NAME(const OSSL_STORE_INFO *info);
 134 const char *OSSL_STORE_INFO_get0_NAME_description(const OSSL_STORE_INFO *info);
 135 char *OSSL_STORE_INFO_get1_NAME_description(const OSSL_STORE_INFO *info);
 136 EVP_PKEY *OSSL_STORE_INFO_get0_PARAMS(const OSSL_STORE_INFO *info);
 137 EVP_PKEY *OSSL_STORE_INFO_get1_PARAMS(const OSSL_STORE_INFO *info);
 138 EVP_PKEY *OSSL_STORE_INFO_get0_PKEY(const OSSL_STORE_INFO *info);
 139 EVP_PKEY *OSSL_STORE_INFO_get1_PKEY(const OSSL_STORE_INFO *info);
 140 X509 *OSSL_STORE_INFO_get0_CERT(const OSSL_STORE_INFO *info);
 141 X509 *OSSL_STORE_INFO_get1_CERT(const OSSL_STORE_INFO *info);
 142 X509_CRL *OSSL_STORE_INFO_get0_CRL(const OSSL_STORE_INFO *info);
 143 X509_CRL *OSSL_STORE_INFO_get1_CRL(const OSSL_STORE_INFO *info);
 144
 145 const char *OSSL_STORE_INFO_type_string(int type);
 146
 147 /*
 148  * Free the OSSL_STORE_INFO
 149  */
 150 void OSSL_STORE_INFO_free(OSSL_STORE_INFO *info);
 151
 152
 153 /*-
 154  *  Function to register a loader for the given URI scheme.
 155  *  -------------------------------------------------------
 156  *
 157  *  The loader receives all the main components of an URI except for the
 158  *  scheme.
 159  */
 160
 161 typedef struct ossl_store_loader_st OSSL_STORE_LOADER;
 162 OSSL_STORE_LOADER *OSSL_STORE_LOADER_new(ENGINE *e, const char *scheme);
 163 const ENGINE *OSSL_STORE_LOADER_get0_engine(const OSSL_STORE_LOADER *loader);
 164 const char *OSSL_STORE_LOADER_get0_scheme(const OSSL_STORE_LOADER *loader);
 165 /* struct ossl_store_loader_ctx_st is defined differently by each loader */
 166 typedef struct ossl_store_loader_ctx_st OSSL_STORE_LOADER_CTX;
 167 typedef OSSL_STORE_LOADER_CTX *(*OSSL_STORE_open_fn)(const OSSL_STORE_LOADER
 168                                                      *loader,
 169                                                      const char *uri,
 170                                                      const UI_METHOD *ui_method,
 171                                                      void *ui_data);
 172 int OSSL_STORE_LOADER_set_open(OSSL_STORE_LOADER *loader,
 173                                OSSL_STORE_open_fn open_function);
 174 typedef int (*OSSL_STORE_ctrl_fn)(OSSL_STORE_LOADER_CTX *ctx, int cmd,
 175                                   va_list args);
 176 int OSSL_STORE_LOADER_set_ctrl(OSSL_STORE_LOADER *loader,
 177                                OSSL_STORE_ctrl_fn ctrl_function);
 178 typedef OSSL_STORE_INFO *(*OSSL_STORE_load_fn)(OSSL_STORE_LOADER_CTX *ctx,
 179                                                const UI_METHOD *ui_method,
 180                                                void *ui_data);
 181 int OSSL_STORE_LOADER_set_load(OSSL_STORE_LOADER *loader,
 182                                OSSL_STORE_load_fn load_function);
 183 typedef int (*OSSL_STORE_eof_fn)(OSSL_STORE_LOADER_CTX *ctx);
 184 int OSSL_STORE_LOADER_set_eof(OSSL_STORE_LOADER *loader,
 185                               OSSL_STORE_eof_fn eof_function);
 186 typedef int (*OSSL_STORE_error_fn)(OSSL_STORE_LOADER_CTX *ctx);
 187 int OSSL_STORE_LOADER_set_error(OSSL_STORE_LOADER *loader,
 188                                 OSSL_STORE_error_fn error_function);
 189 typedef int (*OSSL_STORE_close_fn)(OSSL_STORE_LOADER_CTX *ctx);
 190 int OSSL_STORE_LOADER_set_close(OSSL_STORE_LOADER *loader,
 191                                 OSSL_STORE_close_fn close_function);
 192 void OSSL_STORE_LOADER_free(OSSL_STORE_LOADER *loader);
 193
 194 int OSSL_STORE_register_loader(OSSL_STORE_LOADER *loader);
 195 OSSL_STORE_LOADER *OSSL_STORE_unregister_loader(const char *scheme);
 196
 197 /*-
 198  *  Functions to list STORE loaders
 199  *  -------------------------------
 200  */
 201 int OSSL_STORE_do_all_loaders(void (*do_function) (const OSSL_STORE_LOADER
 202                                                    *loader, void *do_arg),
 203                               void *do_arg);
 204
 205
 206 /*
 207  * Error strings
 208  */
 209 int ERR_load_OSSL_STORE_strings(void);
 210
 211 # ifdef  __cplusplus
 212 }
 213 # endif
 214 #endif