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