crypto/engine/tb_asnmth.c

   1 /*
   2  * Copyright 2006-2020 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (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 /* We need to use some engine deprecated APIs */
  11 #define OPENSSL_SUPPRESS_DEPRECATED
  12
  13 #include "e_os.h"
  14 #include "eng_local.h"
  15 #include <openssl/evp.h>
  16 #include "crypto/asn1.h"
  17
  18 /*
  19  * If this symbol is defined then ENGINE_get_pkey_asn1_meth_engine(), the
  20  * function that is used by EVP to hook in pkey_asn1_meth code and cache
  21  * defaults (etc), will display brief debugging summaries to stderr with the
  22  * 'nid'.
  23  */
  24 /* #define ENGINE_PKEY_ASN1_METH_DEBUG */
  25
  26 static ENGINE_TABLE *pkey_asn1_meth_table = NULL;
  27
  28 void ENGINE_unregister_pkey_asn1_meths(ENGINE *e)
  29 {
  30     engine_table_unregister(&pkey_asn1_meth_table, e);
  31 }
  32
  33 static void engine_unregister_all_pkey_asn1_meths(void)
  34 {
  35     engine_table_cleanup(&pkey_asn1_meth_table);
  36 }
  37
  38 int ENGINE_register_pkey_asn1_meths(ENGINE *e)
  39 {
  40     if (e->pkey_asn1_meths) {
  41         const int *nids;
  42         int num_nids = e->pkey_asn1_meths(e, NULL, &nids, 0);
  43         if (num_nids > 0)
  44             return engine_table_register(&pkey_asn1_meth_table,
  45                                          engine_unregister_all_pkey_asn1_meths,
  46                                          e, nids, num_nids, 0);
  47     }
  48     return 1;
  49 }
  50
  51 void ENGINE_register_all_pkey_asn1_meths(void)
  52 {
  53     ENGINE *e;
  54
  55     for (e = ENGINE_get_first(); e; e = ENGINE_get_next(e))
  56         ENGINE_register_pkey_asn1_meths(e);
  57 }
  58
  59 int ENGINE_set_default_pkey_asn1_meths(ENGINE *e)
  60 {
  61     if (e->pkey_asn1_meths) {
  62         const int *nids;
  63         int num_nids = e->pkey_asn1_meths(e, NULL, &nids, 0);
  64         if (num_nids > 0)
  65             return engine_table_register(&pkey_asn1_meth_table,
  66                                          engine_unregister_all_pkey_asn1_meths,
  67                                          e, nids, num_nids, 1);
  68     }
  69     return 1;
  70 }
  71
  72 /*
  73  * Exposed API function to get a functional reference from the implementation
  74  * table (ie. try to get a functional reference from the tabled structural
  75  * references) for a given pkey_asn1_meth 'nid'
  76  */
  77 ENGINE *ENGINE_get_pkey_asn1_meth_engine(int nid)
  78 {
  79     return engine_table_select(&pkey_asn1_meth_table, nid);
  80 }
  81
  82 /*
  83  * Obtains a pkey_asn1_meth implementation from an ENGINE functional
  84  * reference
  85  */
  86 const EVP_PKEY_ASN1_METHOD *ENGINE_get_pkey_asn1_meth(ENGINE *e, int nid)
  87 {
  88     EVP_PKEY_ASN1_METHOD *ret;
  89     ENGINE_PKEY_ASN1_METHS_PTR fn = ENGINE_get_pkey_asn1_meths(e);
  90     if (!fn || !fn(e, &ret, NULL, nid)) {
  91         ERR_raise(ERR_LIB_ENGINE, ENGINE_R_UNIMPLEMENTED_PUBLIC_KEY_METHOD);
  92         return NULL;
  93     }
  94     return ret;
  95 }
  96
  97 /* Gets the pkey_asn1_meth callback from an ENGINE structure */
  98 ENGINE_PKEY_ASN1_METHS_PTR ENGINE_get_pkey_asn1_meths(const ENGINE *e)
  99 {
 100     return e->pkey_asn1_meths;
 101 }
 102
 103 /* Sets the pkey_asn1_meth callback in an ENGINE structure */
 104 int ENGINE_set_pkey_asn1_meths(ENGINE *e, ENGINE_PKEY_ASN1_METHS_PTR f)
 105 {
 106     e->pkey_asn1_meths = f;
 107     return 1;
 108 }
 109
 110 /*
 111  * Internal function to free up EVP_PKEY_ASN1_METHOD structures before an
 112  * ENGINE is destroyed
 113  */
 114
 115 void engine_pkey_asn1_meths_free(ENGINE *e)
 116 {
 117     int i;
 118     EVP_PKEY_ASN1_METHOD *pkm;
 119     if (e->pkey_asn1_meths) {
 120         const int *pknids;
 121         int npknids;
 122         npknids = e->pkey_asn1_meths(e, NULL, &pknids, 0);
 123         for (i = 0; i < npknids; i++) {
 124             if (e->pkey_asn1_meths(e, &pkm, NULL, pknids[i])) {
 125                 EVP_PKEY_asn1_free(pkm);
 126             }
 127         }
 128     }
 129 }
 130
 131 /*
 132  * Find a method based on a string. This does a linear search through all
 133  * implemented algorithms. This is OK in practice because only a small number
 134  * of algorithms are likely to be implemented in an engine and it is not used
 135  * for speed critical operations.
 136  */
 137
 138 const EVP_PKEY_ASN1_METHOD *ENGINE_get_pkey_asn1_meth_str(ENGINE *e,
 139                                                           const char *str,
 140                                                           int len)
 141 {
 142     int i, nidcount;
 143     const int *nids;
 144     EVP_PKEY_ASN1_METHOD *ameth;
 145     if (!e->pkey_asn1_meths)
 146         return NULL;
 147     if (len == -1)
 148         len = strlen(str);
 149     nidcount = e->pkey_asn1_meths(e, NULL, &nids, 0);
 150     for (i = 0; i < nidcount; i++) {
 151         e->pkey_asn1_meths(e, &ameth, NULL, nids[i]);
 152         if (ameth != NULL
 153             && ((int)strlen(ameth->pem_str) == len)
 154             && strncasecmp(ameth->pem_str, str, len) == 0)
 155             return ameth;
 156     }
 157     return NULL;
 158 }
 159
 160 typedef struct {
 161     ENGINE *e;
 162     const EVP_PKEY_ASN1_METHOD *ameth;
 163     const char *str;
 164     int len;
 165 } ENGINE_FIND_STR;
 166
 167 static void look_str_cb(int nid, STACK_OF(ENGINE) *sk, ENGINE *def, void *arg)
 168 {
 169     ENGINE_FIND_STR *lk = arg;
 170     int i;
 171     if (lk->ameth)
 172         return;
 173     for (i = 0; i < sk_ENGINE_num(sk); i++) {
 174         ENGINE *e = sk_ENGINE_value(sk, i);
 175         EVP_PKEY_ASN1_METHOD *ameth;
 176         e->pkey_asn1_meths(e, &ameth, NULL, nid);
 177         if (ameth != NULL
 178                 && ((int)strlen(ameth->pem_str) == lk->len)
 179                 && strncasecmp(ameth->pem_str, lk->str, lk->len) == 0) {
 180             lk->e = e;
 181             lk->ameth = ameth;
 182             return;
 183         }
 184     }
 185 }
 186
 187 const EVP_PKEY_ASN1_METHOD *ENGINE_pkey_asn1_find_str(ENGINE **pe,
 188                                                       const char *str,
 189                                                       int len)
 190 {
 191     ENGINE_FIND_STR fstr;
 192     fstr.e = NULL;
 193     fstr.ameth = NULL;
 194     fstr.str = str;
 195     fstr.len = len;
 196
 197     if (!RUN_ONCE(&engine_lock_init, do_engine_lock_init)) {
 198         ERR_raise(ERR_LIB_ENGINE, ERR_R_MALLOC_FAILURE);
 199         return NULL;
 200     }
 201
 202     CRYPTO_THREAD_write_lock(global_engine_lock);
 203     engine_table_doall(pkey_asn1_meth_table, look_str_cb, &fstr);
 204     /* If found obtain a structural reference to engine */
 205     if (fstr.e) {
 206         fstr.e->struct_ref++;
 207         engine_ref_debug(fstr.e, 0, 1);
 208     }
 209     *pe = fstr.e;
 210     CRYPTO_THREAD_unlock(global_engine_lock);
 211     return fstr.ameth;
 212 }