crypto/asn1/ameth_lib.c

   1 /*
   2  * Copyright 2006-2017 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 #include "e_os.h"               /* for strncasecmp */
  11 #include "internal/cryptlib.h"
  12 #include <stdio.h>
  13 #include <openssl/asn1t.h>
  14 #include <openssl/x509.h>
  15 #include <openssl/engine.h>
  16 #include "internal/asn1_int.h"
  17 #include "internal/evp_int.h"
  18
  19 #include "standard_methods.h"
  20
  21 typedef int sk_cmp_fn_type(const char *const *a, const char *const *b);
  22 static STACK_OF(EVP_PKEY_ASN1_METHOD) *app_methods = NULL;
  23
  24 DECLARE_OBJ_BSEARCH_CMP_FN(const EVP_PKEY_ASN1_METHOD *,
  25                            const EVP_PKEY_ASN1_METHOD *, ameth);
  26
  27 static int ameth_cmp(const EVP_PKEY_ASN1_METHOD *const *a,
  28                      const EVP_PKEY_ASN1_METHOD *const *b)
  29 {
  30     return ((*a)->pkey_id - (*b)->pkey_id);
  31 }
  32
  33 IMPLEMENT_OBJ_BSEARCH_CMP_FN(const EVP_PKEY_ASN1_METHOD *,
  34                              const EVP_PKEY_ASN1_METHOD *, ameth);
  35
  36 int EVP_PKEY_asn1_get_count(void)
  37 {
  38     int num = OSSL_NELEM(standard_methods);
  39     if (app_methods)
  40         num += sk_EVP_PKEY_ASN1_METHOD_num(app_methods);
  41     return num;
  42 }
  43
  44 const EVP_PKEY_ASN1_METHOD *EVP_PKEY_asn1_get0(int idx)
  45 {
  46     int num = OSSL_NELEM(standard_methods);
  47     if (idx < 0)
  48         return NULL;
  49     if (idx < num)
  50         return standard_methods[idx];
  51     idx -= num;
  52     return sk_EVP_PKEY_ASN1_METHOD_value(app_methods, idx);
  53 }
  54
  55 static const EVP_PKEY_ASN1_METHOD *pkey_asn1_find(int type)
  56 {
  57     EVP_PKEY_ASN1_METHOD tmp;
  58     const EVP_PKEY_ASN1_METHOD *t = &tmp, **ret;
  59     tmp.pkey_id = type;
  60     if (app_methods) {
  61         int idx;
  62         idx = sk_EVP_PKEY_ASN1_METHOD_find(app_methods, &tmp);
  63         if (idx >= 0)
  64             return sk_EVP_PKEY_ASN1_METHOD_value(app_methods, idx);
  65     }
  66     ret = OBJ_bsearch_ameth(&t, standard_methods, OSSL_NELEM(standard_methods));
  67     if (!ret || !*ret)
  68         return NULL;
  69     return *ret;
  70 }
  71
  72 /*
  73  * Find an implementation of an ASN1 algorithm. If 'pe' is not NULL also
  74  * search through engines and set *pe to a functional reference to the engine
  75  * implementing 'type' or NULL if no engine implements it.
  76  */
  77
  78 const EVP_PKEY_ASN1_METHOD *EVP_PKEY_asn1_find(ENGINE **pe, int type)
  79 {
  80     const EVP_PKEY_ASN1_METHOD *t;
  81
  82     for (;;) {
  83         t = pkey_asn1_find(type);
  84         if (!t || !(t->pkey_flags & ASN1_PKEY_ALIAS))
  85             break;
  86         type = t->pkey_base_id;
  87     }
  88     if (pe) {
  89 #ifndef OPENSSL_NO_ENGINE
  90         ENGINE *e;
  91         /* type will contain the final unaliased type */
  92         e = ENGINE_get_pkey_asn1_meth_engine(type);
  93         if (e) {
  94             *pe = e;
  95             return ENGINE_get_pkey_asn1_meth(e, type);
  96         }
  97 #endif
  98         *pe = NULL;
  99     }
 100     return t;
 101 }
 102
 103 const EVP_PKEY_ASN1_METHOD *EVP_PKEY_asn1_find_str(ENGINE **pe,
 104                                                    const char *str, int len)
 105 {
 106     int i;
 107     const EVP_PKEY_ASN1_METHOD *ameth;
 108     if (len == -1)
 109         len = strlen(str);
 110     if (pe) {
 111 #ifndef OPENSSL_NO_ENGINE
 112         ENGINE *e;
 113         ameth = ENGINE_pkey_asn1_find_str(&e, str, len);
 114         if (ameth) {
 115             /*
 116              * Convert structural into functional reference
 117              */
 118             if (!ENGINE_init(e))
 119                 ameth = NULL;
 120             ENGINE_free(e);
 121             *pe = e;
 122             return ameth;
 123         }
 124 #endif
 125         *pe = NULL;
 126     }
 127     for (i = 0; i < EVP_PKEY_asn1_get_count(); i++) {
 128         ameth = EVP_PKEY_asn1_get0(i);
 129         if (ameth->pkey_flags & ASN1_PKEY_ALIAS)
 130             continue;
 131         if (((int)strlen(ameth->pem_str) == len)
 132             && (strncasecmp(ameth->pem_str, str, len) == 0))
 133             return ameth;
 134     }
 135     return NULL;
 136 }
 137
 138 int EVP_PKEY_asn1_add0(const EVP_PKEY_ASN1_METHOD *ameth)
 139 {
 140     if (pkey_asn1_find(ameth->pkey_id) != NULL) {
 141         EVPerr(EVP_F_EVP_PKEY_ASN1_ADD0,
 142                EVP_R_PKEY_ASN1_METHOD_ALREADY_REGISTERED);
 143         return 0;
 144     }
 145     if (app_methods == NULL) {
 146         app_methods = sk_EVP_PKEY_ASN1_METHOD_new(ameth_cmp);
 147         if (app_methods == NULL)
 148             return 0;
 149     }
 150     if (!sk_EVP_PKEY_ASN1_METHOD_push(app_methods, ameth))
 151         return 0;
 152     sk_EVP_PKEY_ASN1_METHOD_sort(app_methods);
 153     return 1;
 154 }
 155
 156 int EVP_PKEY_asn1_add_alias(int to, int from)
 157 {
 158     EVP_PKEY_ASN1_METHOD *ameth;
 159     ameth = EVP_PKEY_asn1_new(from, ASN1_PKEY_ALIAS, NULL, NULL);
 160     if (ameth == NULL)
 161         return 0;
 162     ameth->pkey_base_id = to;
 163     if (!EVP_PKEY_asn1_add0(ameth)) {
 164         EVP_PKEY_asn1_free(ameth);
 165         return 0;
 166     }
 167     return 1;
 168 }
 169
 170 int EVP_PKEY_asn1_get0_info(int *ppkey_id, int *ppkey_base_id,
 171                             int *ppkey_flags, const char **pinfo,
 172                             const char **ppem_str,
 173                             const EVP_PKEY_ASN1_METHOD *ameth)
 174 {
 175     if (!ameth)
 176         return 0;
 177     if (ppkey_id)
 178         *ppkey_id = ameth->pkey_id;
 179     if (ppkey_base_id)
 180         *ppkey_base_id = ameth->pkey_base_id;
 181     if (ppkey_flags)
 182         *ppkey_flags = ameth->pkey_flags;
 183     if (pinfo)
 184         *pinfo = ameth->info;
 185     if (ppem_str)
 186         *ppem_str = ameth->pem_str;
 187     return 1;
 188 }
 189
 190 const EVP_PKEY_ASN1_METHOD *EVP_PKEY_get0_asn1(const EVP_PKEY *pkey)
 191 {
 192     return pkey->ameth;
 193 }
 194
 195 EVP_PKEY_ASN1_METHOD *EVP_PKEY_asn1_new(int id, int flags,
 196                                         const char *pem_str, const char *info)
 197 {
 198     EVP_PKEY_ASN1_METHOD *ameth = OPENSSL_zalloc(sizeof(*ameth));
 199
 200     if (ameth == NULL)
 201         return NULL;
 202
 203     ameth->pkey_id = id;
 204     ameth->pkey_base_id = id;
 205     ameth->pkey_flags = flags | ASN1_PKEY_DYNAMIC;
 206
 207     if (info) {
 208         ameth->info = OPENSSL_strdup(info);
 209         if (!ameth->info)
 210             goto err;
 211     }
 212
 213     if (pem_str) {
 214         ameth->pem_str = OPENSSL_strdup(pem_str);
 215         if (!ameth->pem_str)
 216             goto err;
 217     }
 218
 219     return ameth;
 220
 221  err:
 222     EVP_PKEY_asn1_free(ameth);
 223     return NULL;
 224
 225 }
 226
 227 void EVP_PKEY_asn1_copy(EVP_PKEY_ASN1_METHOD *dst,
 228                         const EVP_PKEY_ASN1_METHOD *src)
 229 {
 230
 231     dst->pub_decode = src->pub_decode;
 232     dst->pub_encode = src->pub_encode;
 233     dst->pub_cmp = src->pub_cmp;
 234     dst->pub_print = src->pub_print;
 235
 236     dst->priv_decode = src->priv_decode;
 237     dst->priv_encode = src->priv_encode;
 238     dst->priv_print = src->priv_print;
 239
 240     dst->old_priv_encode = src->old_priv_encode;
 241     dst->old_priv_decode = src->old_priv_decode;
 242
 243     dst->pkey_size = src->pkey_size;
 244     dst->pkey_bits = src->pkey_bits;
 245
 246     dst->param_decode = src->param_decode;
 247     dst->param_encode = src->param_encode;
 248     dst->param_missing = src->param_missing;
 249     dst->param_copy = src->param_copy;
 250     dst->param_cmp = src->param_cmp;
 251     dst->param_print = src->param_print;
 252
 253     dst->pkey_free = src->pkey_free;
 254     dst->pkey_ctrl = src->pkey_ctrl;
 255
 256     dst->item_sign = src->item_sign;
 257     dst->item_verify = src->item_verify;
 258
 259     dst->siginf_set = src->siginf_set;
 260
 261     dst->pkey_check = src->pkey_check;
 262
 263 }
 264
 265 void EVP_PKEY_asn1_free(EVP_PKEY_ASN1_METHOD *ameth)
 266 {
 267     if (ameth && (ameth->pkey_flags & ASN1_PKEY_DYNAMIC)) {
 268         OPENSSL_free(ameth->pem_str);
 269         OPENSSL_free(ameth->info);
 270         OPENSSL_free(ameth);
 271     }
 272 }
 273
 274 void EVP_PKEY_asn1_set_public(EVP_PKEY_ASN1_METHOD *ameth,
 275                               int (*pub_decode) (EVP_PKEY *pk,
 276                                                  X509_PUBKEY *pub),
 277                               int (*pub_encode) (X509_PUBKEY *pub,
 278                                                  const EVP_PKEY *pk),
 279                               int (*pub_cmp) (const EVP_PKEY *a,
 280                                               const EVP_PKEY *b),
 281                               int (*pub_print) (BIO *out,
 282                                                 const EVP_PKEY *pkey,
 283                                                 int indent, ASN1_PCTX *pctx),
 284                               int (*pkey_size) (const EVP_PKEY *pk),
 285                               int (*pkey_bits) (const EVP_PKEY *pk))
 286 {
 287     ameth->pub_decode = pub_decode;
 288     ameth->pub_encode = pub_encode;
 289     ameth->pub_cmp = pub_cmp;
 290     ameth->pub_print = pub_print;
 291     ameth->pkey_size = pkey_size;
 292     ameth->pkey_bits = pkey_bits;
 293 }
 294
 295 void EVP_PKEY_asn1_set_private(EVP_PKEY_ASN1_METHOD *ameth,
 296                                int (*priv_decode) (EVP_PKEY *pk,
 297                                                    const PKCS8_PRIV_KEY_INFO
 298                                                    *p8inf),
 299                                int (*priv_encode) (PKCS8_PRIV_KEY_INFO *p8,
 300                                                    const EVP_PKEY *pk),
 301                                int (*priv_print) (BIO *out,
 302                                                   const EVP_PKEY *pkey,
 303                                                   int indent,
 304                                                   ASN1_PCTX *pctx))
 305 {
 306     ameth->priv_decode = priv_decode;
 307     ameth->priv_encode = priv_encode;
 308     ameth->priv_print = priv_print;
 309 }
 310
 311 void EVP_PKEY_asn1_set_param(EVP_PKEY_ASN1_METHOD *ameth,
 312                              int (*param_decode) (EVP_PKEY *pkey,
 313                                                   const unsigned char **pder,
 314                                                   int derlen),
 315                              int (*param_encode) (const EVP_PKEY *pkey,
 316                                                   unsigned char **pder),
 317                              int (*param_missing) (const EVP_PKEY *pk),
 318                              int (*param_copy) (EVP_PKEY *to,
 319                                                 const EVP_PKEY *from),
 320                              int (*param_cmp) (const EVP_PKEY *a,
 321                                                const EVP_PKEY *b),
 322                              int (*param_print) (BIO *out,
 323                                                  const EVP_PKEY *pkey,
 324                                                  int indent, ASN1_PCTX *pctx))
 325 {
 326     ameth->param_decode = param_decode;
 327     ameth->param_encode = param_encode;
 328     ameth->param_missing = param_missing;
 329     ameth->param_copy = param_copy;
 330     ameth->param_cmp = param_cmp;
 331     ameth->param_print = param_print;
 332 }
 333
 334 void EVP_PKEY_asn1_set_free(EVP_PKEY_ASN1_METHOD *ameth,
 335                             void (*pkey_free) (EVP_PKEY *pkey))
 336 {
 337     ameth->pkey_free = pkey_free;
 338 }
 339
 340 void EVP_PKEY_asn1_set_ctrl(EVP_PKEY_ASN1_METHOD *ameth,
 341                             int (*pkey_ctrl) (EVP_PKEY *pkey, int op,
 342                                               long arg1, void *arg2))
 343 {
 344     ameth->pkey_ctrl = pkey_ctrl;
 345 }
 346
 347 void EVP_PKEY_asn1_set_security_bits(EVP_PKEY_ASN1_METHOD *ameth,
 348                                      int (*pkey_security_bits) (const EVP_PKEY
 349                                                                 *pk))
 350 {
 351     ameth->pkey_security_bits = pkey_security_bits;
 352 }
 353
 354 void EVP_PKEY_asn1_set_item(EVP_PKEY_ASN1_METHOD *ameth,
 355                             int (*item_verify) (EVP_MD_CTX *ctx,
 356                                                 const ASN1_ITEM *it,
 357                                                 void *asn,
 358                                                 X509_ALGOR *a,
 359                                                 ASN1_BIT_STRING *sig,
 360                                                 EVP_PKEY *pkey),
 361                             int (*item_sign) (EVP_MD_CTX *ctx,
 362                                               const ASN1_ITEM *it,
 363                                               void *asn,
 364                                               X509_ALGOR *alg1,
 365                                               X509_ALGOR *alg2,
 366                                               ASN1_BIT_STRING *sig))
 367 {
 368     ameth->item_sign = item_sign;
 369     ameth->item_verify = item_verify;
 370 }
 371
 372 void EVP_PKEY_asn1_set_siginf(EVP_PKEY_ASN1_METHOD *ameth,
 373                               int (*siginf_set) (X509_SIG_INFO *siginf,
 374                                                  const X509_ALGOR *alg,
 375                                                  const ASN1_STRING *sig))
 376 {
 377     ameth->siginf_set = siginf_set;
 378 }
 379
 380 void EVP_PKEY_asn1_set_check(EVP_PKEY_ASN1_METHOD *ameth,
 381                              int (*pkey_check) (const EVP_PKEY *pk))
 382 {
 383     ameth->pkey_check = pkey_check;
 384 }
 385
 386 void EVP_PKEY_asn1_set_public_check(EVP_PKEY_ASN1_METHOD *ameth,
 387                                     int (*pkey_pub_check) (const EVP_PKEY *pk))
 388 {
 389     ameth->pkey_public_check = pkey_pub_check;
 390 }
 391
 392 void EVP_PKEY_asn1_set_param_check(EVP_PKEY_ASN1_METHOD *ameth,
 393                                    int (*pkey_param_check) (const EVP_PKEY *pk))
 394 {
 395     ameth->pkey_param_check = pkey_param_check;
 396 }