crypto/store/str_mem.c

   1 /* crypto/store/str_mem.c -*- mode:C; c-file-style: "eay" -*- */
   2 /*
   3  * Written by Richard Levitte (richard@levitte.org) for the OpenSSL project
   4  * 2003.
   5  */
   6 /* ====================================================================
   7  * Copyright (c) 2003 The OpenSSL Project.  All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  *
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in
  18  *    the documentation and/or other materials provided with the
  19  *    distribution.
  20  *
  21  * 3. All advertising materials mentioning features or use of this
  22  *    software must display the following acknowledgment:
  23  *    "This product includes software developed by the OpenSSL Project
  24  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  25  *
  26  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  27  *    endorse or promote products derived from this software without
  28  *    prior written permission. For written permission, please contact
  29  *    openssl-core@openssl.org.
  30  *
  31  * 5. Products derived from this software may not be called "OpenSSL"
  32  *    nor may "OpenSSL" appear in their names without prior written
  33  *    permission of the OpenSSL Project.
  34  *
  35  * 6. Redistributions of any form whatsoever must retain the following
  36  *    acknowledgment:
  37  *    "This product includes software developed by the OpenSSL Project
  38  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  41  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  43  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  44  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  45  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  46  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  47  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  49  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  50  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  51  * OF THE POSSIBILITY OF SUCH DAMAGE.
  52  * ====================================================================
  53  *
  54  * This product includes cryptographic software written by Eric Young
  55  * (eay@cryptsoft.com).  This product includes software written by Tim
  56  * Hudson (tjh@cryptsoft.com).
  57  *
  58  */
  59
  60 #include <string.h>
  61 #include <openssl/err.h>
  62 #include "str_locl.h"
  63
  64 /*
  65  * The memory store is currently highly experimental.  It's meant to become a
  66  * base store used by other stores for internal caching (for full caching
  67  * support, aging needs to be added).
  68  *
  69  * The database use is meant to support as much attribute association as
  70  * possible, while providing for as small search ranges as possible. This is
  71  * currently provided for by sorting the entries by numbers that are composed
  72  * of bits set at the positions indicated by attribute type codes.  This
  73  * provides for ranges determined by the highest attribute type code value.
  74  * A better idea might be to sort by values computed from the range of
  75  * attributes associated with the object (basically, the difference between
  76  * the highest and lowest attribute type code) and it's distance from a base
  77  * (basically, the lowest associated attribute type code).
  78  */
  79
  80 typedef struct mem_object_data_st {
  81     STORE_OBJECT *object;
  82     STORE_ATTR_INFO *attr_info;
  83     int references;
  84 } MEM_OBJECT_DATA;
  85
  86 DECLARE_STACK_OF(MEM_OBJECT_DATA)
  87 struct mem_data_st {
  88     /*
  89      * sorted with
  90      * STORE_ATTR_INFO_compare().
  91      */
  92     STACK_OF(MEM_OBJECT_DATA) *data;
  93     /*
  94      * Currently unused, but can
  95      * be used to add attributes
  96      * from parts of the data.
  97      */
  98     unsigned int compute_components:1;
  99 };
 100
 101 DECLARE_STACK_OF(STORE_ATTR_INFO)
 102 struct mem_ctx_st {
 103     /* The type we're searching for */
 104     int type;
 105     /*
 106      * Sets of
 107      * attributes to search for.  Each
 108      * element is a STORE_ATTR_INFO.
 109      */
 110     STACK_OF(STORE_ATTR_INFO) *search_attributes;
 111     /*
 112      * which of the search attributes we
 113      * found a match for, -1 when we still
 114      * haven't found any
 115      */
 116     int search_index;
 117     /* -1 as long as we're searching for the first */
 118     int index;
 119 };
 120
 121 static int mem_init(STORE *s);
 122 static void mem_clean(STORE *s);
 123 static STORE_OBJECT *mem_generate(STORE *s, STORE_OBJECT_TYPES type,
 124                                   OPENSSL_ITEM attributes[],
 125                                   OPENSSL_ITEM parameters[]);
 126 static STORE_OBJECT *mem_get(STORE *s, STORE_OBJECT_TYPES type,
 127                              OPENSSL_ITEM attributes[],
 128                              OPENSSL_ITEM parameters[]);
 129 static int mem_store(STORE *s, STORE_OBJECT_TYPES type, STORE_OBJECT *data,
 130                      OPENSSL_ITEM attributes[], OPENSSL_ITEM parameters[]);
 131 static int mem_modify(STORE *s, STORE_OBJECT_TYPES type,
 132                       OPENSSL_ITEM search_attributes[],
 133                       OPENSSL_ITEM add_attributes[],
 134                       OPENSSL_ITEM modify_attributes[],
 135                       OPENSSL_ITEM delete_attributes[],
 136                       OPENSSL_ITEM parameters[]);
 137 static int mem_delete(STORE *s, STORE_OBJECT_TYPES type,
 138                       OPENSSL_ITEM attributes[], OPENSSL_ITEM parameters[]);
 139 static void *mem_list_start(STORE *s, STORE_OBJECT_TYPES type,
 140                             OPENSSL_ITEM attributes[],
 141                             OPENSSL_ITEM parameters[]);
 142 static STORE_OBJECT *mem_list_next(STORE *s, void *handle);
 143 static int mem_list_end(STORE *s, void *handle);
 144 static int mem_list_endp(STORE *s, void *handle);
 145 static int mem_lock(STORE *s, OPENSSL_ITEM attributes[],
 146                     OPENSSL_ITEM parameters[]);
 147 static int mem_unlock(STORE *s, OPENSSL_ITEM attributes[],
 148                       OPENSSL_ITEM parameters[]);
 149 static int mem_ctrl(STORE *s, int cmd, long l, void *p, void (*f) (void));
 150
 151 static STORE_METHOD store_memory = {
 152     "OpenSSL memory store interface",
 153     mem_init,
 154     mem_clean,
 155     mem_generate,
 156     mem_get,
 157     mem_store,
 158     mem_modify,
 159     NULL,                       /* revoke */
 160     mem_delete,
 161     mem_list_start,
 162     mem_list_next,
 163     mem_list_end,
 164     mem_list_endp,
 165     NULL,                       /* update */
 166     mem_lock,
 167     mem_unlock,
 168     mem_ctrl
 169 };
 170
 171 const STORE_METHOD *STORE_Memory(void)
 172 {
 173     return &store_memory;
 174 }
 175
 176 static int mem_init(STORE *s)
 177 {
 178     return 1;
 179 }
 180
 181 static void mem_clean(STORE *s)
 182 {
 183     return;
 184 }
 185
 186 static STORE_OBJECT *mem_generate(STORE *s, STORE_OBJECT_TYPES type,
 187                                   OPENSSL_ITEM attributes[],
 188                                   OPENSSL_ITEM parameters[])
 189 {
 190     STOREerr(STORE_F_MEM_GENERATE, STORE_R_NOT_IMPLEMENTED);
 191     return 0;
 192 }
 193
 194 static STORE_OBJECT *mem_get(STORE *s, STORE_OBJECT_TYPES type,
 195                              OPENSSL_ITEM attributes[],
 196                              OPENSSL_ITEM parameters[])
 197 {
 198     void *context = mem_list_start(s, type, attributes, parameters);
 199
 200     if (context) {
 201         STORE_OBJECT *object = mem_list_next(s, context);
 202
 203         if (mem_list_end(s, context))
 204             return object;
 205     }
 206     return NULL;
 207 }
 208
 209 static int mem_store(STORE *s, STORE_OBJECT_TYPES type,
 210                      STORE_OBJECT *data, OPENSSL_ITEM attributes[],
 211                      OPENSSL_ITEM parameters[])
 212 {
 213     STOREerr(STORE_F_MEM_STORE, STORE_R_NOT_IMPLEMENTED);
 214     return 0;
 215 }
 216
 217 static int mem_modify(STORE *s, STORE_OBJECT_TYPES type,
 218                       OPENSSL_ITEM search_attributes[],
 219                       OPENSSL_ITEM add_attributes[],
 220                       OPENSSL_ITEM modify_attributes[],
 221                       OPENSSL_ITEM delete_attributes[],
 222                       OPENSSL_ITEM parameters[])
 223 {
 224     STOREerr(STORE_F_MEM_MODIFY, STORE_R_NOT_IMPLEMENTED);
 225     return 0;
 226 }
 227
 228 static int mem_delete(STORE *s, STORE_OBJECT_TYPES type,
 229                       OPENSSL_ITEM attributes[], OPENSSL_ITEM parameters[])
 230 {
 231     STOREerr(STORE_F_MEM_DELETE, STORE_R_NOT_IMPLEMENTED);
 232     return 0;
 233 }
 234
 235 /*
 236  * The list functions may be the hardest to understand.  Basically,
 237  * mem_list_start compiles a stack of attribute info elements, and puts that
 238  * stack into the context to be returned.  mem_list_next will then find the
 239  * first matching element in the store, and then walk all the way to the end
 240  * of the store (since any combination of attribute bits above the starting
 241  * point may match the searched for bit pattern...).
 242  */
 243 static void *mem_list_start(STORE *s, STORE_OBJECT_TYPES type,
 244                             OPENSSL_ITEM attributes[],
 245                             OPENSSL_ITEM parameters[])
 246 {
 247     struct mem_ctx_st *context = OPENSSL_malloc(sizeof(struct mem_ctx_st));
 248     void *attribute_context = NULL;
 249     STORE_ATTR_INFO *attrs = NULL;
 250
 251     if (!context) {
 252         STOREerr(STORE_F_MEM_LIST_START, ERR_R_MALLOC_FAILURE);
 253         return 0;
 254     }
 255     memset(context, 0, sizeof(struct mem_ctx_st));
 256
 257     attribute_context = STORE_parse_attrs_start(attributes);
 258     if (!attribute_context) {
 259         STOREerr(STORE_F_MEM_LIST_START, ERR_R_STORE_LIB);
 260         goto err;
 261     }
 262
 263     while ((attrs = STORE_parse_attrs_next(attribute_context))) {
 264         if (context->search_attributes == NULL) {
 265             context->search_attributes =
 266                 sk_STORE_ATTR_INFO_new(STORE_ATTR_INFO_compare);
 267             if (!context->search_attributes) {
 268                 STOREerr(STORE_F_MEM_LIST_START, ERR_R_MALLOC_FAILURE);
 269                 goto err;
 270             }
 271         }
 272         sk_STORE_ATTR_INFO_push(context->search_attributes, attrs);
 273     }
 274     if (!STORE_parse_attrs_endp(attribute_context))
 275         goto err;
 276     STORE_parse_attrs_end(attribute_context);
 277     context->search_index = -1;
 278     context->index = -1;
 279     return context;
 280  err:
 281     if (attribute_context)
 282         STORE_parse_attrs_end(attribute_context);
 283     mem_list_end(s, context);
 284     return NULL;
 285 }
 286
 287 static STORE_OBJECT *mem_list_next(STORE *s, void *handle)
 288 {
 289     int i;
 290     struct mem_ctx_st *context = (struct mem_ctx_st *)handle;
 291     struct mem_object_data_st key = { 0, 0, 1 };
 292     struct mem_data_st *store = (struct mem_data_st *)STORE_get_ex_data(s, 1);
 293     int srch;
 294     int cres = 0;
 295
 296     if (!context) {
 297         STOREerr(STORE_F_MEM_LIST_NEXT, ERR_R_PASSED_NULL_PARAMETER);
 298         return NULL;
 299     }
 300     if (!store) {
 301         STOREerr(STORE_F_MEM_LIST_NEXT, STORE_R_NO_STORE);
 302         return NULL;
 303     }
 304
 305     if (context->search_index == -1) {
 306         for (i = 0;
 307              i < sk_STORE_ATTR_INFO_num(context->search_attributes); i++) {
 308             key.attr_info
 309                 = sk_STORE_ATTR_INFO_value(context->search_attributes, i);
 310             srch = sk_MEM_OBJECT_DATA_find_ex(store->data, &key);
 311
 312             if (srch >= 0) {
 313                 context->search_index = srch;
 314                 break;
 315             }
 316         }
 317     }
 318     if (context->search_index < 0)
 319         return NULL;
 320
 321     key.attr_info =
 322         sk_STORE_ATTR_INFO_value(context->search_attributes,
 323                                  context->search_index);
 324     for (srch = context->search_index;
 325          srch < sk_MEM_OBJECT_DATA_num(store->data)
 326          && STORE_ATTR_INFO_in_range(key.attr_info,
 327                                      sk_MEM_OBJECT_DATA_value(store->data,
 328                                                               srch)->attr_info)
 329          && !(cres =
 330               STORE_ATTR_INFO_in_ex(key.attr_info,
 331                                     sk_MEM_OBJECT_DATA_value(store->data,
 332                                                              srch)->attr_info));
 333          srch++) ;
 334
 335     context->search_index = srch;
 336     if (cres)
 337         return (sk_MEM_OBJECT_DATA_value(store->data, srch))->object;
 338     return NULL;
 339 }
 340
 341 static int mem_list_end(STORE *s, void *handle)
 342 {
 343     struct mem_ctx_st *context = (struct mem_ctx_st *)handle;
 344
 345     if (!context) {
 346         STOREerr(STORE_F_MEM_LIST_END, ERR_R_PASSED_NULL_PARAMETER);
 347         return 0;
 348     }
 349     if (context && context->search_attributes)
 350         sk_STORE_ATTR_INFO_free(context->search_attributes);
 351     if (context)
 352         OPENSSL_free(context);
 353     return 1;
 354 }
 355
 356 static int mem_list_endp(STORE *s, void *handle)
 357 {
 358     struct mem_ctx_st *context = (struct mem_ctx_st *)handle;
 359
 360     if (!context
 361         || context->search_index
 362         == sk_STORE_ATTR_INFO_num(context->search_attributes))
 363         return 1;
 364     return 0;
 365 }
 366
 367 static int mem_lock(STORE *s, OPENSSL_ITEM attributes[],
 368                     OPENSSL_ITEM parameters[])
 369 {
 370     return 1;
 371 }
 372
 373 static int mem_unlock(STORE *s, OPENSSL_ITEM attributes[],
 374                       OPENSSL_ITEM parameters[])
 375 {
 376     return 1;
 377 }
 378
 379 static int mem_ctrl(STORE *s, int cmd, long l, void *p, void (*f) (void))
 380 {
 381     return 1;
 382 }