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 (app_methods == NULL) {
 141         app_methods = sk_EVP_PKEY_ASN1_METHOD_new(ameth_cmp);
 142         if (app_methods == NULL)
 143             return 0;
 144     }
 145     if (!sk_EVP_PKEY_ASN1_METHOD_push(app_methods, ameth))
 146         return 0;
 147     sk_EVP_PKEY_ASN1_METHOD_sort(app_methods);
 148     return 1;
 149 }
 150
 151 int EVP_PKEY_asn1_add_alias(int to, int from)
 152 {
 153     EVP_PKEY_ASN1_METHOD *ameth;
 154     ameth = EVP_PKEY_asn1_new(from, ASN1_PKEY_ALIAS, NULL, NULL);
 155     if (ameth == NULL)
 156         return 0;
 157     ameth->pkey_base_id = to;
 158     if (!EVP_PKEY_asn1_add0(ameth)) {
 159         EVP_PKEY_asn1_free(ameth);
 160         return 0;
 161     }
 162     return 1;
 163 }
 164
 165 int EVP_PKEY_asn1_get0_info(int *ppkey_id, int *ppkey_base_id,
 166                             int *ppkey_flags, const char **pinfo,
 167                             const char **ppem_str,
 168                             const EVP_PKEY_ASN1_METHOD *ameth)
 169 {
 170     if (!ameth)
 171         return 0;
 172     if (ppkey_id)
 173         *ppkey_id = ameth->pkey_id;
 174     if (ppkey_base_id)
 175         *ppkey_base_id = ameth->pkey_base_id;
 176     if (ppkey_flags)
 177         *ppkey_flags = ameth->pkey_flags;
 178     if (pinfo)
 179         *pinfo = ameth->info;
 180     if (ppem_str)
 181         *ppem_str = ameth->pem_str;
 182     return 1;
 183 }
 184
 185 const EVP_PKEY_ASN1_METHOD *EVP_PKEY_get0_asn1(const EVP_PKEY *pkey)
 186 {
 187     return pkey->ameth;
 188 }
 189
 190 EVP_PKEY_ASN1_METHOD *EVP_PKEY_asn1_new(int id, int flags,
 191                                         const char *pem_str, const char *info)
 192 {
 193     EVP_PKEY_ASN1_METHOD *ameth = OPENSSL_zalloc(sizeof(*ameth));
 194
 195     if (ameth == NULL)
 196         return NULL;
 197
 198     ameth->pkey_id = id;
 199     ameth->pkey_base_id = id;
 200     ameth->pkey_flags = flags | ASN1_PKEY_DYNAMIC;
 201
 202     if (info) {
 203         ameth->info = OPENSSL_strdup(info);
 204         if (!ameth->info)
 205             goto err;
 206     }
 207
 208     if (pem_str) {
 209         ameth->pem_str = OPENSSL_strdup(pem_str);
 210         if (!ameth->pem_str)
 211             goto err;
 212     }
 213
 214     return ameth;
 215
 216  err:
 217     EVP_PKEY_asn1_free(ameth);
 218     return NULL;
 219
 220 }
 221
 222 void EVP_PKEY_asn1_copy(EVP_PKEY_ASN1_METHOD *dst,
 223                         const EVP_PKEY_ASN1_METHOD *src)
 224 {
 225
 226     dst->pub_decode = src->pub_decode;
 227     dst->pub_encode = src->pub_encode;
 228     dst->pub_cmp = src->pub_cmp;
 229     dst->pub_print = src->pub_print;
 230
 231     dst->priv_decode = src->priv_decode;
 232     dst->priv_encode = src->priv_encode;
 233     dst->priv_print = src->priv_print;
 234
 235     dst->old_priv_encode = src->old_priv_encode;
 236     dst->old_priv_decode = src->old_priv_decode;
 237
 238     dst->pkey_size = src->pkey_size;
 239     dst->pkey_bits = src->pkey_bits;
 240
 241     dst->param_decode = src->param_decode;
 242     dst->param_encode = src->param_encode;
 243     dst->param_missing = src->param_missing;
 244     dst->param_copy = src->param_copy;
 245     dst->param_cmp = src->param_cmp;
 246     dst->param_print = src->param_print;
 247
 248     dst->pkey_free = src->pkey_free;
 249     dst->pkey_ctrl = src->pkey_ctrl;
 250
 251     dst->item_sign = src->item_sign;
 252     dst->item_verify = src->item_verify;
 253
 254 }
 255
 256 void EVP_PKEY_asn1_free(EVP_PKEY_ASN1_METHOD *ameth)
 257 {
 258     if (ameth && (ameth->pkey_flags & ASN1_PKEY_DYNAMIC)) {
 259         OPENSSL_free(ameth->pem_str);
 260         OPENSSL_free(ameth->info);
 261         OPENSSL_free(ameth);
 262     }
 263 }
 264
 265 void EVP_PKEY_asn1_set_public(EVP_PKEY_ASN1_METHOD *ameth,
 266                               int (*pub_decode) (EVP_PKEY *pk,
 267                                                  X509_PUBKEY *pub),
 268                               int (*pub_encode) (X509_PUBKEY *pub,
 269                                                  const EVP_PKEY *pk),
 270                               int (*pub_cmp) (const EVP_PKEY *a,
 271                                               const EVP_PKEY *b),
 272                               int (*pub_print) (BIO *out,
 273                                                 const EVP_PKEY *pkey,
 274                                                 int indent, ASN1_PCTX *pctx),
 275                               int (*pkey_size) (const EVP_PKEY *pk),
 276                               int (*pkey_bits) (const EVP_PKEY *pk))
 277 {
 278     ameth->pub_decode = pub_decode;
 279     ameth->pub_encode = pub_encode;
 280     ameth->pub_cmp = pub_cmp;
 281     ameth->pub_print = pub_print;
 282     ameth->pkey_size = pkey_size;
 283     ameth->pkey_bits = pkey_bits;
 284 }
 285
 286 void EVP_PKEY_asn1_set_private(EVP_PKEY_ASN1_METHOD *ameth,
 287                                int (*priv_decode) (EVP_PKEY *pk,
 288                                                    const PKCS8_PRIV_KEY_INFO
 289                                                    *p8inf),
 290                                int (*priv_encode) (PKCS8_PRIV_KEY_INFO *p8,
 291                                                    const EVP_PKEY *pk),
 292                                int (*priv_print) (BIO *out,
 293                                                   const EVP_PKEY *pkey,
 294                                                   int indent,
 295                                                   ASN1_PCTX *pctx))
 296 {
 297     ameth->priv_decode = priv_decode;
 298     ameth->priv_encode = priv_encode;
 299     ameth->priv_print = priv_print;
 300 }
 301
 302 void EVP_PKEY_asn1_set_param(EVP_PKEY_ASN1_METHOD *ameth,
 303                              int (*param_decode) (EVP_PKEY *pkey,
 304                                                   const unsigned char **pder,
 305                                                   int derlen),
 306                              int (*param_encode) (const EVP_PKEY *pkey,
 307                                                   unsigned char **pder),
 308                              int (*param_missing) (const EVP_PKEY *pk),
 309                              int (*param_copy) (EVP_PKEY *to,
 310                                                 const EVP_PKEY *from),
 311                              int (*param_cmp) (const EVP_PKEY *a,
 312                                                const EVP_PKEY *b),
 313                              int (*param_print) (BIO *out,
 314                                                  const EVP_PKEY *pkey,
 315                                                  int indent, ASN1_PCTX *pctx))
 316 {
 317     ameth->param_decode = param_decode;
 318     ameth->param_encode = param_encode;
 319     ameth->param_missing = param_missing;
 320     ameth->param_copy = param_copy;
 321     ameth->param_cmp = param_cmp;
 322     ameth->param_print = param_print;
 323 }
 324
 325 void EVP_PKEY_asn1_set_free(EVP_PKEY_ASN1_METHOD *ameth,
 326                             void (*pkey_free) (EVP_PKEY *pkey))
 327 {
 328     ameth->pkey_free = pkey_free;
 329 }
 330
 331 void EVP_PKEY_asn1_set_ctrl(EVP_PKEY_ASN1_METHOD *ameth,
 332                             int (*pkey_ctrl) (EVP_PKEY *pkey, int op,
 333                                               long arg1, void *arg2))
 334 {
 335     ameth->pkey_ctrl = pkey_ctrl;
 336 }
 337
 338 void EVP_PKEY_asn1_set_security_bits(EVP_PKEY_ASN1_METHOD *ameth,
 339                                      int (*pkey_security_bits) (const EVP_PKEY
 340                                                                 *pk))
 341 {
 342     ameth->pkey_security_bits = pkey_security_bits;
 343 }
 344
 345 void EVP_PKEY_asn1_set_item(EVP_PKEY_ASN1_METHOD *ameth,
 346                             int (*item_verify) (EVP_MD_CTX *ctx,
 347                                                 const ASN1_ITEM *it,
 348                                                 void *asn,
 349                                                 X509_ALGOR *a,
 350                                                 ASN1_BIT_STRING *sig,
 351                                                 EVP_PKEY *pkey),
 352                             int (*item_sign) (EVP_MD_CTX *ctx,
 353                                               const ASN1_ITEM *it,
 354                                               void *asn,
 355                                               X509_ALGOR *alg1,
 356                                               X509_ALGOR *alg2,
 357                                               ASN1_BIT_STRING *sig))
 358 {
 359     ameth->item_sign = item_sign;
 360     ameth->item_verify = item_verify;
 361 }