crypto/objects/o_names.c

   1 /*
   2  * Copyright 1998-2016 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 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <string.h>
  13
  14 #include <openssl/err.h>
  15 #include <openssl/lhash.h>
  16 #include <openssl/objects.h>
  17 #include <openssl/safestack.h>
  18 #include <openssl/e_os2.h>
  19 #include "obj_lcl.h"
  20
  21 /*
  22  * We define this wrapper for two reasons. Firstly, later versions of
  23  * DEC C add linkage information to certain functions, which makes it
  24  * tricky to use them as values to regular function pointers.
  25  * Secondly, in the EDK2 build environment, the strcmp function is
  26  * actually an external function (AsciiStrCmp) with the Microsoft ABI,
  27  * so we can't transparently assign function pointers to it.
  28  * Arguably the latter is a stupidity of the UEFI environment, but
  29  * since the wrapper solves the DEC C issue too, let's just use the
  30  * same solution.
  31  */
  32 #if defined(OPENSSL_SYS_VMS_DECC) || defined(OPENSSL_SYS_UEFI)
  33 static int obj_strcmp(const char *a, const char *b)
  34 {
  35     return strcmp(a, b);
  36 }
  37 #else
  38 #define obj_strcmp strcmp
  39 #endif
  40
  41 /*
  42  * I use the ex_data stuff to manage the identifiers for the obj_name_types
  43  * that applications may define.  I only really use the free function field.
  44  */
  45 static LHASH_OF(OBJ_NAME) *names_lh = NULL;
  46 static int names_type_num = OBJ_NAME_TYPE_NUM;
  47
  48 struct name_funcs_st {
  49     unsigned long (*hash_func) (const char *name);
  50     int (*cmp_func) (const char *a, const char *b);
  51     void (*free_func) (const char *, int, const char *);
  52 };
  53
  54 static STACK_OF(NAME_FUNCS) *name_funcs_stack;
  55
  56 /*
  57  * The LHASH callbacks now use the raw "void *" prototypes and do
  58  * per-variable casting in the functions. This prevents function pointer
  59  * casting without the need for macro-generated wrapper functions.
  60  */
  61
  62 static unsigned long obj_name_hash(const OBJ_NAME *a);
  63 static int obj_name_cmp(const OBJ_NAME *a, const OBJ_NAME *b);
  64
  65 int OBJ_NAME_init(void)
  66 {
  67     if (names_lh != NULL)
  68         return (1);
  69     CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_DISABLE);
  70     names_lh = lh_OBJ_NAME_new(obj_name_hash, obj_name_cmp);
  71     CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_ENABLE);
  72     return (names_lh != NULL);
  73 }
  74
  75 int OBJ_NAME_new_index(unsigned long (*hash_func) (const char *),
  76                        int (*cmp_func) (const char *, const char *),
  77                        void (*free_func) (const char *, int, const char *))
  78 {
  79     int ret;
  80     int i;
  81     NAME_FUNCS *name_funcs;
  82
  83     if (name_funcs_stack == NULL) {
  84         CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_DISABLE);
  85         name_funcs_stack = sk_NAME_FUNCS_new_null();
  86         CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_ENABLE);
  87     }
  88     if (name_funcs_stack == NULL) {
  89         /* ERROR */
  90         return (0);
  91     }
  92     ret = names_type_num;
  93     names_type_num++;
  94     for (i = sk_NAME_FUNCS_num(name_funcs_stack); i < names_type_num; i++) {
  95         CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_DISABLE);
  96         name_funcs = OPENSSL_zalloc(sizeof(*name_funcs));
  97         CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_ENABLE);
  98         if (name_funcs == NULL) {
  99             OBJerr(OBJ_F_OBJ_NAME_NEW_INDEX, ERR_R_MALLOC_FAILURE);
 100             return (0);
 101         }
 102         name_funcs->hash_func = OPENSSL_LH_strhash;
 103         name_funcs->cmp_func = obj_strcmp;
 104         CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_DISABLE);
 105         sk_NAME_FUNCS_push(name_funcs_stack, name_funcs);
 106         CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_ENABLE);
 107     }
 108     name_funcs = sk_NAME_FUNCS_value(name_funcs_stack, ret);
 109     if (hash_func != NULL)
 110         name_funcs->hash_func = hash_func;
 111     if (cmp_func != NULL)
 112         name_funcs->cmp_func = cmp_func;
 113     if (free_func != NULL)
 114         name_funcs->free_func = free_func;
 115     return (ret);
 116 }
 117
 118 static int obj_name_cmp(const OBJ_NAME *a, const OBJ_NAME *b)
 119 {
 120     int ret;
 121
 122     ret = a->type - b->type;
 123     if (ret == 0) {
 124         if ((name_funcs_stack != NULL)
 125             && (sk_NAME_FUNCS_num(name_funcs_stack) > a->type)) {
 126             ret = sk_NAME_FUNCS_value(name_funcs_stack,
 127                                       a->type)->cmp_func(a->name, b->name);
 128         } else
 129             ret = strcmp(a->name, b->name);
 130     }
 131     return (ret);
 132 }
 133
 134 static unsigned long obj_name_hash(const OBJ_NAME *a)
 135 {
 136     unsigned long ret;
 137
 138     if ((name_funcs_stack != NULL)
 139         && (sk_NAME_FUNCS_num(name_funcs_stack) > a->type)) {
 140         ret =
 141             sk_NAME_FUNCS_value(name_funcs_stack,
 142                                 a->type)->hash_func(a->name);
 143     } else {
 144         ret = OPENSSL_LH_strhash(a->name);
 145     }
 146     ret ^= a->type;
 147     return (ret);
 148 }
 149
 150 const char *OBJ_NAME_get(const char *name, int type)
 151 {
 152     OBJ_NAME on, *ret;
 153     int num = 0, alias;
 154
 155     if (name == NULL)
 156         return (NULL);
 157     if ((names_lh == NULL) && !OBJ_NAME_init())
 158         return (NULL);
 159
 160     alias = type & OBJ_NAME_ALIAS;
 161     type &= ~OBJ_NAME_ALIAS;
 162
 163     on.name = name;
 164     on.type = type;
 165
 166     for (;;) {
 167         ret = lh_OBJ_NAME_retrieve(names_lh, &on);
 168         if (ret == NULL)
 169             return (NULL);
 170         if ((ret->alias) && !alias) {
 171             if (++num > 10)
 172                 return (NULL);
 173             on.name = ret->data;
 174         } else {
 175             return (ret->data);
 176         }
 177     }
 178 }
 179
 180 int OBJ_NAME_add(const char *name, int type, const char *data)
 181 {
 182     OBJ_NAME *onp, *ret;
 183     int alias;
 184
 185     if ((names_lh == NULL) && !OBJ_NAME_init())
 186         return (0);
 187
 188     alias = type & OBJ_NAME_ALIAS;
 189     type &= ~OBJ_NAME_ALIAS;
 190
 191     onp = OPENSSL_malloc(sizeof(*onp));
 192     if (onp == NULL) {
 193         /* ERROR */
 194         return (0);
 195     }
 196
 197     onp->name = name;
 198     onp->alias = alias;
 199     onp->type = type;
 200     onp->data = data;
 201
 202     ret = lh_OBJ_NAME_insert(names_lh, onp);
 203     if (ret != NULL) {
 204         /* free things */
 205         if ((name_funcs_stack != NULL)
 206             && (sk_NAME_FUNCS_num(name_funcs_stack) > ret->type)) {
 207             /*
 208              * XXX: I'm not sure I understand why the free function should
 209              * get three arguments... -- Richard Levitte
 210              */
 211             sk_NAME_FUNCS_value(name_funcs_stack,
 212                                 ret->type)->free_func(ret->name, ret->type,
 213                                                       ret->data);
 214         }
 215         OPENSSL_free(ret);
 216     } else {
 217         if (lh_OBJ_NAME_error(names_lh)) {
 218             /* ERROR */
 219             return (0);
 220         }
 221     }
 222     return (1);
 223 }
 224
 225 int OBJ_NAME_remove(const char *name, int type)
 226 {
 227     OBJ_NAME on, *ret;
 228
 229     if (names_lh == NULL)
 230         return (0);
 231
 232     type &= ~OBJ_NAME_ALIAS;
 233     on.name = name;
 234     on.type = type;
 235     ret = lh_OBJ_NAME_delete(names_lh, &on);
 236     if (ret != NULL) {
 237         /* free things */
 238         if ((name_funcs_stack != NULL)
 239             && (sk_NAME_FUNCS_num(name_funcs_stack) > ret->type)) {
 240             /*
 241              * XXX: I'm not sure I understand why the free function should
 242              * get three arguments... -- Richard Levitte
 243              */
 244             sk_NAME_FUNCS_value(name_funcs_stack,
 245                                 ret->type)->free_func(ret->name, ret->type,
 246                                                       ret->data);
 247         }
 248         OPENSSL_free(ret);
 249         return (1);
 250     } else
 251         return (0);
 252 }
 253
 254 typedef struct {
 255     int type;
 256     void (*fn) (const OBJ_NAME *, void *arg);
 257     void *arg;
 258 } OBJ_DOALL;
 259
 260 static void do_all_fn(const OBJ_NAME *name, OBJ_DOALL *d)
 261 {
 262     if (name->type == d->type)
 263         d->fn(name, d->arg);
 264 }
 265
 266 IMPLEMENT_LHASH_DOALL_ARG_CONST(OBJ_NAME, OBJ_DOALL);
 267
 268 void OBJ_NAME_do_all(int type, void (*fn) (const OBJ_NAME *, void *arg),
 269                      void *arg)
 270 {
 271     OBJ_DOALL d;
 272
 273     d.type = type;
 274     d.fn = fn;
 275     d.arg = arg;
 276
 277     lh_OBJ_NAME_doall_OBJ_DOALL(names_lh, do_all_fn, &d);
 278 }
 279
 280 struct doall_sorted {
 281     int type;
 282     int n;
 283     const OBJ_NAME **names;
 284 };
 285
 286 static void do_all_sorted_fn(const OBJ_NAME *name, void *d_)
 287 {
 288     struct doall_sorted *d = d_;
 289
 290     if (name->type != d->type)
 291         return;
 292
 293     d->names[d->n++] = name;
 294 }
 295
 296 static int do_all_sorted_cmp(const void *n1_, const void *n2_)
 297 {
 298     const OBJ_NAME *const *n1 = n1_;
 299     const OBJ_NAME *const *n2 = n2_;
 300
 301     return strcmp((*n1)->name, (*n2)->name);
 302 }
 303
 304 void OBJ_NAME_do_all_sorted(int type,
 305                             void (*fn) (const OBJ_NAME *, void *arg),
 306                             void *arg)
 307 {
 308     struct doall_sorted d;
 309     int n;
 310
 311     d.type = type;
 312     d.names =
 313         OPENSSL_malloc(sizeof(*d.names) * lh_OBJ_NAME_num_items(names_lh));
 314     /* Really should return an error if !d.names...but its a void function! */
 315     if (d.names != NULL) {
 316         d.n = 0;
 317         OBJ_NAME_do_all(type, do_all_sorted_fn, &d);
 318
 319         qsort((void *)d.names, d.n, sizeof(*d.names), do_all_sorted_cmp);
 320
 321         for (n = 0; n < d.n; ++n)
 322             fn(d.names[n], arg);
 323
 324         OPENSSL_free((void *)d.names);
 325     }
 326 }
 327
 328 static int free_type;
 329
 330 static void names_lh_free_doall(OBJ_NAME *onp)
 331 {
 332     if (onp == NULL)
 333         return;
 334
 335     if (free_type < 0 || free_type == onp->type)
 336         OBJ_NAME_remove(onp->name, onp->type);
 337 }
 338
 339 static void name_funcs_free(NAME_FUNCS *ptr)
 340 {
 341     OPENSSL_free(ptr);
 342 }
 343
 344 void OBJ_NAME_cleanup(int type)
 345 {
 346     unsigned long down_load;
 347
 348     if (names_lh == NULL)
 349         return;
 350
 351     free_type = type;
 352     down_load = lh_OBJ_NAME_get_down_load(names_lh);
 353     lh_OBJ_NAME_set_down_load(names_lh, 0);
 354
 355     lh_OBJ_NAME_doall(names_lh, names_lh_free_doall);
 356     if (type < 0) {
 357         lh_OBJ_NAME_free(names_lh);
 358         sk_NAME_FUNCS_pop_free(name_funcs_stack, name_funcs_free);
 359         names_lh = NULL;
 360         name_funcs_stack = NULL;
 361     } else
 362         lh_OBJ_NAME_set_down_load(names_lh, down_load);
 363 }