crypto/param_build.c

   1 /*
   2  * Copyright 2019-2023 The OpenSSL Project Authors. All Rights Reserved.
   3  * Copyright (c) 2019, Oracle and/or its affiliates.  All rights reserved.
   4  *
   5  * Licensed under the Apache License 2.0 (the "License").  You may not use
   6  * this file except in compliance with the License.  You can obtain a copy
   7  * in the file LICENSE in the source distribution or at
   8  * https://www.openssl.org/source/license.html
   9  */
  10
  11 #include <string.h>
  12 #include <openssl/err.h>
  13 #include <openssl/cryptoerr.h>
  14 #include <openssl/params.h>
  15 #include <openssl/types.h>
  16 #include <openssl/safestack.h>
  17 #include "internal/param_build_set.h"
  18
  19 /*
  20  * Special internal param type to indicate the end of an allocate OSSL_PARAM
  21  * array.
  22  */
  23
  24 typedef struct {
  25     const char *key;
  26     int type;
  27     int secure;
  28     size_t size;
  29     size_t alloc_blocks;
  30     const BIGNUM *bn;
  31     const void *string;
  32     union {
  33         /*
  34          * These fields are never directly addressed, but their sizes are
  35          * important so that all native types can be copied here without overrun.
  36          */
  37         ossl_intmax_t i;
  38         ossl_uintmax_t u;
  39         double d;
  40     } num;
  41 } OSSL_PARAM_BLD_DEF;
  42
  43 DEFINE_STACK_OF(OSSL_PARAM_BLD_DEF)
  44
  45 struct ossl_param_bld_st {
  46     size_t total_blocks;
  47     size_t secure_blocks;
  48     STACK_OF(OSSL_PARAM_BLD_DEF) *params;
  49 };
  50
  51 static OSSL_PARAM_BLD_DEF *param_push(OSSL_PARAM_BLD *bld, const char *key,
  52                                       size_t size, size_t alloc, int type,
  53                                       int secure)
  54 {
  55     OSSL_PARAM_BLD_DEF *pd = OPENSSL_zalloc(sizeof(*pd));
  56
  57     if (pd == NULL)
  58         return NULL;
  59     pd->key = key;
  60     pd->type = type;
  61     pd->size = size;
  62     pd->alloc_blocks = ossl_param_bytes_to_blocks(alloc);
  63     if ((pd->secure = secure) != 0)
  64         bld->secure_blocks += pd->alloc_blocks;
  65     else
  66         bld->total_blocks += pd->alloc_blocks;
  67     if (sk_OSSL_PARAM_BLD_DEF_push(bld->params, pd) <= 0) {
  68         OPENSSL_free(pd);
  69         pd = NULL;
  70     }
  71     return pd;
  72 }
  73
  74 static int param_push_num(OSSL_PARAM_BLD *bld, const char *key,
  75                           void *num, size_t size, int type)
  76 {
  77     OSSL_PARAM_BLD_DEF *pd = param_push(bld, key, size, size, type, 0);
  78
  79     if (pd == NULL) {
  80         ERR_raise(ERR_LIB_CRYPTO, ERR_R_PASSED_NULL_PARAMETER);
  81         return 0;
  82     }
  83     if (size > sizeof(pd->num)) {
  84         ERR_raise(ERR_LIB_CRYPTO, CRYPTO_R_TOO_MANY_BYTES);
  85         return 0;
  86     }
  87     memcpy(&pd->num, num, size);
  88     return 1;
  89 }
  90
  91 OSSL_PARAM_BLD *OSSL_PARAM_BLD_new(void)
  92 {
  93     OSSL_PARAM_BLD *r = OPENSSL_zalloc(sizeof(OSSL_PARAM_BLD));
  94
  95     if (r != NULL) {
  96         r->params = sk_OSSL_PARAM_BLD_DEF_new_null();
  97         if (r->params == NULL) {
  98             OPENSSL_free(r);
  99             r = NULL;
 100         }
 101     }
 102     return r;
 103 }
 104
 105 static void free_all_params(OSSL_PARAM_BLD *bld)
 106 {
 107     int i, n = sk_OSSL_PARAM_BLD_DEF_num(bld->params);
 108
 109     for (i = 0; i < n; i++)
 110         OPENSSL_free(sk_OSSL_PARAM_BLD_DEF_pop(bld->params));
 111 }
 112
 113 void OSSL_PARAM_BLD_free(OSSL_PARAM_BLD *bld)
 114 {
 115     if (bld == NULL)
 116         return;
 117     free_all_params(bld);
 118     sk_OSSL_PARAM_BLD_DEF_free(bld->params);
 119     OPENSSL_free(bld);
 120 }
 121
 122 int OSSL_PARAM_BLD_push_int(OSSL_PARAM_BLD *bld, const char *key, int num)
 123 {
 124     return param_push_num(bld, key, &num, sizeof(num), OSSL_PARAM_INTEGER);
 125 }
 126
 127 int OSSL_PARAM_BLD_push_uint(OSSL_PARAM_BLD *bld, const char *key,
 128                              unsigned int num)
 129 {
 130     return param_push_num(bld, key, &num, sizeof(num),
 131                           OSSL_PARAM_UNSIGNED_INTEGER);
 132 }
 133
 134 int OSSL_PARAM_BLD_push_long(OSSL_PARAM_BLD *bld, const char *key,
 135                              long int num)
 136 {
 137     return param_push_num(bld, key, &num, sizeof(num), OSSL_PARAM_INTEGER);
 138 }
 139
 140 int OSSL_PARAM_BLD_push_ulong(OSSL_PARAM_BLD *bld, const char *key,
 141                               unsigned long int num)
 142 {
 143     return param_push_num(bld, key, &num, sizeof(num),
 144                           OSSL_PARAM_UNSIGNED_INTEGER);
 145 }
 146
 147 int OSSL_PARAM_BLD_push_int32(OSSL_PARAM_BLD *bld, const char *key,
 148                               int32_t num)
 149 {
 150     return param_push_num(bld, key, &num, sizeof(num), OSSL_PARAM_INTEGER);
 151 }
 152
 153 int OSSL_PARAM_BLD_push_uint32(OSSL_PARAM_BLD *bld, const char *key,
 154                                uint32_t num)
 155 {
 156     return param_push_num(bld, key, &num, sizeof(num),
 157                           OSSL_PARAM_UNSIGNED_INTEGER);
 158 }
 159
 160 int OSSL_PARAM_BLD_push_int64(OSSL_PARAM_BLD *bld, const char *key,
 161                               int64_t num)
 162 {
 163     return param_push_num(bld, key, &num, sizeof(num), OSSL_PARAM_INTEGER);
 164 }
 165
 166 int OSSL_PARAM_BLD_push_uint64(OSSL_PARAM_BLD *bld, const char *key,
 167                                uint64_t num)
 168 {
 169     return param_push_num(bld, key, &num, sizeof(num),
 170                           OSSL_PARAM_UNSIGNED_INTEGER);
 171 }
 172
 173 int OSSL_PARAM_BLD_push_size_t(OSSL_PARAM_BLD *bld, const char *key,
 174                                size_t num)
 175 {
 176     return param_push_num(bld, key, &num, sizeof(num),
 177                           OSSL_PARAM_UNSIGNED_INTEGER);
 178 }
 179
 180 int OSSL_PARAM_BLD_push_time_t(OSSL_PARAM_BLD *bld, const char *key,
 181                                time_t num)
 182 {
 183     return param_push_num(bld, key, &num, sizeof(num),
 184                           OSSL_PARAM_INTEGER);
 185 }
 186
 187 int OSSL_PARAM_BLD_push_double(OSSL_PARAM_BLD *bld, const char *key,
 188                                double num)
 189 {
 190     return param_push_num(bld, key, &num, sizeof(num), OSSL_PARAM_REAL);
 191 }
 192
 193 static int push_BN(OSSL_PARAM_BLD *bld, const char *key,
 194                    const BIGNUM *bn, size_t sz, int type)
 195 {
 196     int n, secure = 0;
 197     OSSL_PARAM_BLD_DEF *pd;
 198
 199     if (!ossl_assert(type == OSSL_PARAM_UNSIGNED_INTEGER
 200                      || type == OSSL_PARAM_INTEGER))
 201         return 0;
 202
 203     if (bn != NULL) {
 204         if (type == OSSL_PARAM_UNSIGNED_INTEGER && BN_is_negative(bn)) {
 205             ERR_raise_data(ERR_LIB_CRYPTO, ERR_R_UNSUPPORTED,
 206                            "Negative big numbers are unsupported for OSSL_PARAM_UNSIGNED_INTEGER");
 207             return 0;
 208         }
 209
 210         n = BN_num_bytes(bn);
 211         if (n < 0) {
 212             ERR_raise(ERR_LIB_CRYPTO, CRYPTO_R_ZERO_LENGTH_NUMBER);
 213             return 0;
 214         }
 215         if (sz < (size_t)n) {
 216             ERR_raise(ERR_LIB_CRYPTO, CRYPTO_R_TOO_SMALL_BUFFER);
 217             return 0;
 218         }
 219         if (BN_get_flags(bn, BN_FLG_SECURE) == BN_FLG_SECURE)
 220             secure = 1;
 221
 222         /* The BIGNUM is zero, we must transfer at least one byte */
 223         if (sz == 0)
 224             sz++;
 225     }
 226     pd = param_push(bld, key, sz, sz, type, secure);
 227     if (pd == NULL)
 228         return 0;
 229     pd->bn = bn;
 230     return 1;
 231 }
 232
 233 int OSSL_PARAM_BLD_push_BN(OSSL_PARAM_BLD *bld, const char *key,
 234                            const BIGNUM *bn)
 235 {
 236     if (bn != NULL && BN_is_negative(bn))
 237         return push_BN(bld, key, bn, BN_num_bytes(bn) + 1,
 238                        OSSL_PARAM_INTEGER);
 239     return push_BN(bld, key, bn, bn == NULL ? 0 : BN_num_bytes(bn),
 240                    OSSL_PARAM_UNSIGNED_INTEGER);
 241 }
 242
 243 int OSSL_PARAM_BLD_push_BN_pad(OSSL_PARAM_BLD *bld, const char *key,
 244                                const BIGNUM *bn, size_t sz)
 245 {
 246     if (bn != NULL && BN_is_negative(bn))
 247         return push_BN(bld, key, bn, BN_num_bytes(bn),
 248                        OSSL_PARAM_INTEGER);
 249     return push_BN(bld, key, bn, sz, OSSL_PARAM_UNSIGNED_INTEGER);
 250 }
 251
 252 int OSSL_PARAM_BLD_push_utf8_string(OSSL_PARAM_BLD *bld, const char *key,
 253                                     const char *buf, size_t bsize)
 254 {
 255     OSSL_PARAM_BLD_DEF *pd;
 256     int secure;
 257
 258     if (bsize == 0)
 259         bsize = strlen(buf);
 260     secure = CRYPTO_secure_allocated(buf);
 261     pd = param_push(bld, key, bsize, bsize + 1, OSSL_PARAM_UTF8_STRING, secure);
 262     if (pd == NULL)
 263         return 0;
 264     pd->string = buf;
 265     return 1;
 266 }
 267
 268 int OSSL_PARAM_BLD_push_utf8_ptr(OSSL_PARAM_BLD *bld, const char *key,
 269                                  char *buf, size_t bsize)
 270 {
 271     OSSL_PARAM_BLD_DEF *pd;
 272
 273     if (bsize == 0)
 274         bsize = strlen(buf);
 275     pd = param_push(bld, key, bsize, sizeof(buf), OSSL_PARAM_UTF8_PTR, 0);
 276     if (pd == NULL)
 277         return 0;
 278     pd->string = buf;
 279     return 1;
 280 }
 281
 282 int OSSL_PARAM_BLD_push_octet_string(OSSL_PARAM_BLD *bld, const char *key,
 283                                      const void *buf, size_t bsize)
 284 {
 285     OSSL_PARAM_BLD_DEF *pd;
 286     int secure;
 287
 288     secure = CRYPTO_secure_allocated(buf);
 289     pd = param_push(bld, key, bsize, bsize, OSSL_PARAM_OCTET_STRING, secure);
 290     if (pd == NULL)
 291         return 0;
 292     pd->string = buf;
 293     return 1;
 294 }
 295
 296 int OSSL_PARAM_BLD_push_octet_ptr(OSSL_PARAM_BLD *bld, const char *key,
 297                                   void *buf, size_t bsize)
 298 {
 299     OSSL_PARAM_BLD_DEF *pd;
 300
 301     pd = param_push(bld, key, bsize, sizeof(buf), OSSL_PARAM_OCTET_PTR, 0);
 302     if (pd == NULL)
 303         return 0;
 304     pd->string = buf;
 305     return 1;
 306 }
 307
 308 static OSSL_PARAM *param_bld_convert(OSSL_PARAM_BLD *bld, OSSL_PARAM *param,
 309                                      OSSL_PARAM_ALIGNED_BLOCK *blk,
 310                                      OSSL_PARAM_ALIGNED_BLOCK *secure)
 311 {
 312     int i, num = sk_OSSL_PARAM_BLD_DEF_num(bld->params);
 313     OSSL_PARAM_BLD_DEF *pd;
 314     void *p;
 315
 316     for (i = 0; i < num; i++) {
 317         pd = sk_OSSL_PARAM_BLD_DEF_value(bld->params, i);
 318         param[i].key = pd->key;
 319         param[i].data_type = pd->type;
 320         param[i].data_size = pd->size;
 321         param[i].return_size = OSSL_PARAM_UNMODIFIED;
 322
 323         if (pd->secure) {
 324             p = secure;
 325             secure += pd->alloc_blocks;
 326         } else {
 327             p = blk;
 328             blk += pd->alloc_blocks;
 329         }
 330         param[i].data = p;
 331         if (pd->bn != NULL) {
 332             /* BIGNUM */
 333             if (pd->type == OSSL_PARAM_UNSIGNED_INTEGER)
 334                 BN_bn2nativepad(pd->bn, (unsigned char *)p, pd->size);
 335             else
 336                 BN_signed_bn2native(pd->bn, (unsigned char *)p, pd->size);
 337         } else if (pd->type == OSSL_PARAM_OCTET_PTR
 338                    || pd->type == OSSL_PARAM_UTF8_PTR) {
 339             /* PTR */
 340             *(const void **)p = pd->string;
 341         } else if (pd->type == OSSL_PARAM_OCTET_STRING
 342                    || pd->type == OSSL_PARAM_UTF8_STRING) {
 343             if (pd->string != NULL)
 344                 memcpy(p, pd->string, pd->size);
 345             else
 346                 memset(p, 0, pd->size);
 347             if (pd->type == OSSL_PARAM_UTF8_STRING)
 348                 ((char *)p)[pd->size] = '\0';
 349         } else {
 350             /* Number, but could also be a NULL BIGNUM */
 351             if (pd->size > sizeof(pd->num))
 352                 memset(p, 0, pd->size);
 353             else if (pd->size > 0)
 354                 memcpy(p, &pd->num, pd->size);
 355         }
 356     }
 357     param[i] = OSSL_PARAM_construct_end();
 358     return param + i;
 359 }
 360
 361 OSSL_PARAM *OSSL_PARAM_BLD_to_param(OSSL_PARAM_BLD *bld)
 362 {
 363     OSSL_PARAM_ALIGNED_BLOCK *blk, *s = NULL;
 364     OSSL_PARAM *params, *last;
 365     const int num = sk_OSSL_PARAM_BLD_DEF_num(bld->params);
 366     const size_t p_blks = ossl_param_bytes_to_blocks((1 + num) * sizeof(*params));
 367     const size_t total = OSSL_PARAM_ALIGN_SIZE * (p_blks + bld->total_blocks);
 368     const size_t ss = OSSL_PARAM_ALIGN_SIZE * bld->secure_blocks;
 369
 370     if (ss > 0) {
 371         s = OPENSSL_secure_malloc(ss);
 372         if (s == NULL) {
 373             ERR_raise(ERR_LIB_CRYPTO, CRYPTO_R_SECURE_MALLOC_FAILURE);
 374             return NULL;
 375         }
 376     }
 377     params = OPENSSL_malloc(total);
 378     if (params == NULL) {
 379         OPENSSL_secure_free(s);
 380         return NULL;
 381     }
 382     blk = p_blks + (OSSL_PARAM_ALIGNED_BLOCK *)(params);
 383     last = param_bld_convert(bld, params, blk, s);
 384     ossl_param_set_secure_block(last, s, ss);
 385
 386     /* Reset builder for reuse */
 387     bld->total_blocks = 0;
 388     bld->secure_blocks = 0;
 389     free_all_params(bld);
 390     return params;
 391 }