crypto/asn1/ameth_lib.c

   1 /*
   2  * Copyright 2006-2016 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 "internal/cryptlib.h"
  12 #include <openssl/asn1t.h>
  13 #include <openssl/x509.h>
  14 #include <openssl/engine.h>
  15 #include "internal/asn1_int.h"
  16 #include "internal/evp_int.h"
  17
  18 /* Keep this sorted in type order !! */
  19 static const EVP_PKEY_ASN1_METHOD *standard_methods[] = {
  20 #ifndef OPENSSL_NO_RSA
  21     &rsa_asn1_meths[0],
  22     &rsa_asn1_meths[1],
  23 #endif
  24 #ifndef OPENSSL_NO_DH
  25     &dh_asn1_meth,
  26 #endif
  27 #ifndef OPENSSL_NO_DSA
  28     &dsa_asn1_meths[0],
  29     &dsa_asn1_meths[1],
  30     &dsa_asn1_meths[2],
  31     &dsa_asn1_meths[3],
  32     &dsa_asn1_meths[4],
  33 #endif
  34 #ifndef OPENSSL_NO_EC
  35     &eckey_asn1_meth,
  36 #endif
  37     &hmac_asn1_meth,
  38 #ifndef OPENSSL_NO_CMAC
  39     &cmac_asn1_meth,
  40 #endif
  41 #ifndef OPENSSL_NO_DH
  42     &dhx_asn1_meth
  43 #endif
  44 };
  45
  46 typedef int sk_cmp_fn_type(const char *const *a, const char *const *b);
  47 static STACK_OF(EVP_PKEY_ASN1_METHOD) *app_methods = NULL;
  48
  49 #ifdef TEST
  50 void main()
  51 {
  52     int i;
  53     for (i = 0; i < OSSL_NELEM(standard_methods); i++)
  54         fprintf(stderr, "Number %d id=%d (%s)\n", i,
  55                 standard_methods[i]->pkey_id,
  56                 OBJ_nid2sn(standard_methods[i]->pkey_id));
  57 }
  58 #endif
  59
  60 DECLARE_OBJ_BSEARCH_CMP_FN(const EVP_PKEY_ASN1_METHOD *,
  61                            const EVP_PKEY_ASN1_METHOD *, ameth);
  62
  63 static int ameth_cmp(const EVP_PKEY_ASN1_METHOD *const *a,
  64                      const EVP_PKEY_ASN1_METHOD *const *b)
  65 {
  66     return ((*a)->pkey_id - (*b)->pkey_id);
  67 }
  68
  69 IMPLEMENT_OBJ_BSEARCH_CMP_FN(const EVP_PKEY_ASN1_METHOD *,
  70                              const EVP_PKEY_ASN1_METHOD *, ameth);
  71
  72 int EVP_PKEY_asn1_get_count(void)
  73 {
  74     int num = OSSL_NELEM(standard_methods);
  75     if (app_methods)
  76         num += sk_EVP_PKEY_ASN1_METHOD_num(app_methods);
  77     return num;
  78 }
  79
  80 const EVP_PKEY_ASN1_METHOD *EVP_PKEY_asn1_get0(int idx)
  81 {
  82     int num = OSSL_NELEM(standard_methods);
  83     if (idx < 0)
  84         return NULL;
  85     if (idx < num)
  86         return standard_methods[idx];
  87     idx -= num;
  88     return sk_EVP_PKEY_ASN1_METHOD_value(app_methods, idx);
  89 }
  90
  91 static const EVP_PKEY_ASN1_METHOD *pkey_asn1_find(int type)
  92 {
  93     EVP_PKEY_ASN1_METHOD tmp;
  94     const EVP_PKEY_ASN1_METHOD *t = &tmp, **ret;
  95     tmp.pkey_id = type;
  96     if (app_methods) {
  97         int idx;
  98         idx = sk_EVP_PKEY_ASN1_METHOD_find(app_methods, &tmp);
  99         if (idx >= 0)
 100             return sk_EVP_PKEY_ASN1_METHOD_value(app_methods, idx);
 101     }
 102     ret = OBJ_bsearch_ameth(&t, standard_methods, OSSL_NELEM(standard_methods));
 103     if (!ret || !*ret)
 104         return NULL;
 105     return *ret;
 106 }
 107
 108 /*
 109  * Find an implementation of an ASN1 algorithm. If 'pe' is not NULL also
 110  * search through engines and set *pe to a functional reference to the engine
 111  * implementing 'type' or NULL if no engine implements it.
 112  */
 113
 114 const EVP_PKEY_ASN1_METHOD *EVP_PKEY_asn1_find(ENGINE **pe, int type)
 115 {
 116     const EVP_PKEY_ASN1_METHOD *t;
 117
 118     for (;;) {
 119         t = pkey_asn1_find(type);
 120         if (!t || !(t->pkey_flags & ASN1_PKEY_ALIAS))
 121             break;
 122         type = t->pkey_base_id;
 123     }
 124     if (pe) {
 125 #ifndef OPENSSL_NO_ENGINE
 126         ENGINE *e;
 127         /* type will contain the final unaliased type */
 128         e = ENGINE_get_pkey_asn1_meth_engine(type);
 129         if (e) {
 130             *pe = e;
 131             return ENGINE_get_pkey_asn1_meth(e, type);
 132         }
 133 #endif
 134         *pe = NULL;
 135     }
 136     return t;
 137 }
 138
 139 const EVP_PKEY_ASN1_METHOD *EVP_PKEY_asn1_find_str(ENGINE **pe,
 140                                                    const char *str, int len)
 141 {
 142     int i;
 143     const EVP_PKEY_ASN1_METHOD *ameth;
 144     if (len == -1)
 145         len = strlen(str);
 146     if (pe) {
 147 #ifndef OPENSSL_NO_ENGINE
 148         ENGINE *e;
 149         ameth = ENGINE_pkey_asn1_find_str(&e, str, len);
 150         if (ameth) {
 151             /*
 152              * Convert structural into functional reference
 153              */
 154             if (!ENGINE_init(e))
 155                 ameth = NULL;
 156             ENGINE_free(e);
 157             *pe = e;
 158             return ameth;
 159         }
 160 #endif
 161         *pe = NULL;
 162     }
 163     for (i = 0; i < EVP_PKEY_asn1_get_count(); i++) {
 164         ameth = EVP_PKEY_asn1_get0(i);
 165         if (ameth->pkey_flags & ASN1_PKEY_ALIAS)
 166             continue;
 167         if (((int)strlen(ameth->pem_str) == len)
 168             && (strncasecmp(ameth->pem_str, str, len) == 0))
 169             return ameth;
 170     }
 171     return NULL;
 172 }
 173
 174 int EVP_PKEY_asn1_add0(const EVP_PKEY_ASN1_METHOD *ameth)
 175 {
 176     if (app_methods == NULL) {
 177         app_methods = sk_EVP_PKEY_ASN1_METHOD_new(ameth_cmp);
 178         if (app_methods == NULL)
 179             return 0;
 180     }
 181     if (!sk_EVP_PKEY_ASN1_METHOD_push(app_methods, ameth))
 182         return 0;
 183     sk_EVP_PKEY_ASN1_METHOD_sort(app_methods);
 184     return 1;
 185 }
 186
 187 int EVP_PKEY_asn1_add_alias(int to, int from)
 188 {
 189     EVP_PKEY_ASN1_METHOD *ameth;
 190     ameth = EVP_PKEY_asn1_new(from, ASN1_PKEY_ALIAS, NULL, NULL);
 191     if (ameth == NULL)
 192         return 0;
 193     ameth->pkey_base_id = to;
 194     if (!EVP_PKEY_asn1_add0(ameth)) {
 195         EVP_PKEY_asn1_free(ameth);
 196         return 0;
 197     }
 198     return 1;
 199 }
 200
 201 int EVP_PKEY_asn1_get0_info(int *ppkey_id, int *ppkey_base_id,
 202                             int *ppkey_flags, const char **pinfo,
 203                             const char **ppem_str,
 204                             const EVP_PKEY_ASN1_METHOD *ameth)
 205 {
 206     if (!ameth)
 207         return 0;
 208     if (ppkey_id)
 209         *ppkey_id = ameth->pkey_id;
 210     if (ppkey_base_id)
 211         *ppkey_base_id = ameth->pkey_base_id;
 212     if (ppkey_flags)
 213         *ppkey_flags = ameth->pkey_flags;
 214     if (pinfo)
 215         *pinfo = ameth->info;
 216     if (ppem_str)
 217         *ppem_str = ameth->pem_str;
 218     return 1;
 219 }
 220
 221 const EVP_PKEY_ASN1_METHOD *EVP_PKEY_get0_asn1(EVP_PKEY *pkey)
 222 {
 223     return pkey->ameth;
 224 }
 225
 226 EVP_PKEY_ASN1_METHOD *EVP_PKEY_asn1_new(int id, int flags,
 227                                         const char *pem_str, const char *info)
 228 {
 229     EVP_PKEY_ASN1_METHOD *ameth = OPENSSL_zalloc(sizeof(*ameth));
 230
 231     if (ameth == NULL)
 232         return NULL;
 233
 234     ameth->pkey_id = id;
 235     ameth->pkey_base_id = id;
 236     ameth->pkey_flags = flags | ASN1_PKEY_DYNAMIC;
 237
 238     if (info) {
 239         ameth->info = OPENSSL_strdup(info);
 240         if (!ameth->info)
 241             goto err;
 242     }
 243
 244     if (pem_str) {
 245         ameth->pem_str = OPENSSL_strdup(pem_str);
 246         if (!ameth->pem_str)
 247             goto err;
 248     }
 249
 250     return ameth;
 251
 252  err:
 253     EVP_PKEY_asn1_free(ameth);
 254     return NULL;
 255
 256 }
 257
 258 void EVP_PKEY_asn1_copy(EVP_PKEY_ASN1_METHOD *dst,
 259                         const EVP_PKEY_ASN1_METHOD *src)
 260 {
 261
 262     dst->pub_decode = src->pub_decode;
 263     dst->pub_encode = src->pub_encode;
 264     dst->pub_cmp = src->pub_cmp;
 265     dst->pub_print = src->pub_print;
 266
 267     dst->priv_decode = src->priv_decode;
 268     dst->priv_encode = src->priv_encode;
 269     dst->priv_print = src->priv_print;
 270
 271     dst->old_priv_encode = src->old_priv_encode;
 272     dst->old_priv_decode = src->old_priv_decode;
 273
 274     dst->pkey_size = src->pkey_size;
 275     dst->pkey_bits = src->pkey_bits;
 276
 277     dst->param_decode = src->param_decode;
 278     dst->param_encode = src->param_encode;
 279     dst->param_missing = src->param_missing;
 280     dst->param_copy = src->param_copy;
 281     dst->param_cmp = src->param_cmp;
 282     dst->param_print = src->param_print;
 283
 284     dst->pkey_free = src->pkey_free;
 285     dst->pkey_ctrl = src->pkey_ctrl;
 286
 287     dst->item_sign = src->item_sign;
 288     dst->item_verify = src->item_verify;
 289
 290 }
 291
 292 void EVP_PKEY_asn1_free(EVP_PKEY_ASN1_METHOD *ameth)
 293 {
 294     if (ameth && (ameth->pkey_flags & ASN1_PKEY_DYNAMIC)) {
 295         OPENSSL_free(ameth->pem_str);
 296         OPENSSL_free(ameth->info);
 297         OPENSSL_free(ameth);
 298     }
 299 }
 300
 301 void EVP_PKEY_asn1_set_public(EVP_PKEY_ASN1_METHOD *ameth,
 302                               int (*pub_decode) (EVP_PKEY *pk,
 303                                                  X509_PUBKEY *pub),
 304                               int (*pub_encode) (X509_PUBKEY *pub,
 305                                                  const EVP_PKEY *pk),
 306                               int (*pub_cmp) (const EVP_PKEY *a,
 307                                               const EVP_PKEY *b),
 308                               int (*pub_print) (BIO *out,
 309                                                 const EVP_PKEY *pkey,
 310                                                 int indent, ASN1_PCTX *pctx),
 311                               int (*pkey_size) (const EVP_PKEY *pk),
 312                               int (*pkey_bits) (const EVP_PKEY *pk))
 313 {
 314     ameth->pub_decode = pub_decode;
 315     ameth->pub_encode = pub_encode;
 316     ameth->pub_cmp = pub_cmp;
 317     ameth->pub_print = pub_print;
 318     ameth->pkey_size = pkey_size;
 319     ameth->pkey_bits = pkey_bits;
 320 }
 321
 322 void EVP_PKEY_asn1_set_private(EVP_PKEY_ASN1_METHOD *ameth,
 323                                int (*priv_decode) (EVP_PKEY *pk,
 324                                                    PKCS8_PRIV_KEY_INFO
 325                                                    *p8inf),
 326                                int (*priv_encode) (PKCS8_PRIV_KEY_INFO *p8,
 327                                                    const EVP_PKEY *pk),
 328                                int (*priv_print) (BIO *out,
 329                                                   const EVP_PKEY *pkey,
 330                                                   int indent,
 331                                                   ASN1_PCTX *pctx))
 332 {
 333     ameth->priv_decode = priv_decode;
 334     ameth->priv_encode = priv_encode;
 335     ameth->priv_print = priv_print;
 336 }
 337
 338 void EVP_PKEY_asn1_set_param(EVP_PKEY_ASN1_METHOD *ameth,
 339                              int (*param_decode) (EVP_PKEY *pkey,
 340                                                   const unsigned char **pder,
 341                                                   int derlen),
 342                              int (*param_encode) (const EVP_PKEY *pkey,
 343                                                   unsigned char **pder),
 344                              int (*param_missing) (const EVP_PKEY *pk),
 345                              int (*param_copy) (EVP_PKEY *to,
 346                                                 const EVP_PKEY *from),
 347                              int (*param_cmp) (const EVP_PKEY *a,
 348                                                const EVP_PKEY *b),
 349                              int (*param_print) (BIO *out,
 350                                                  const EVP_PKEY *pkey,
 351                                                  int indent, ASN1_PCTX *pctx))
 352 {
 353     ameth->param_decode = param_decode;
 354     ameth->param_encode = param_encode;
 355     ameth->param_missing = param_missing;
 356     ameth->param_copy = param_copy;
 357     ameth->param_cmp = param_cmp;
 358     ameth->param_print = param_print;
 359 }
 360
 361 void EVP_PKEY_asn1_set_free(EVP_PKEY_ASN1_METHOD *ameth,
 362                             void (*pkey_free) (EVP_PKEY *pkey))
 363 {
 364     ameth->pkey_free = pkey_free;
 365 }
 366
 367 void EVP_PKEY_asn1_set_ctrl(EVP_PKEY_ASN1_METHOD *ameth,
 368                             int (*pkey_ctrl) (EVP_PKEY *pkey, int op,
 369                                               long arg1, void *arg2))
 370 {
 371     ameth->pkey_ctrl = pkey_ctrl;
 372 }
 373
 374 void EVP_PKEY_asn1_set_security_bits(EVP_PKEY_ASN1_METHOD *ameth,
 375                                      int (*pkey_security_bits) (const EVP_PKEY
 376                                                                 *pk))
 377 {
 378     ameth->pkey_security_bits = pkey_security_bits;
 379 }
 380
 381 void EVP_PKEY_asn1_set_item(EVP_PKEY_ASN1_METHOD *ameth,
 382                             int (*item_verify) (EVP_MD_CTX *ctx,
 383                                                 const ASN1_ITEM *it,
 384                                                 void *asn,
 385                                                 X509_ALGOR *a,
 386                                                 ASN1_BIT_STRING *sig,
 387                                                 EVP_PKEY *pkey),
 388                             int (*item_sign) (EVP_MD_CTX *ctx,
 389                                               const ASN1_ITEM *it,
 390                                               void *asn,
 391                                               X509_ALGOR *alg1,
 392                                               X509_ALGOR *alg2,
 393                                               ASN1_BIT_STRING *sig))
 394 {
 395     ameth->item_sign = item_sign;
 396     ameth->item_verify = item_verify;
 397 }