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209 lines
6 KiB
C
209 lines
6 KiB
C
/*
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* Copyright 2006-2018 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include "e_os.h"
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#include "eng_int.h"
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#include <openssl/evp.h>
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#include "internal/asn1_int.h"
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/*
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* If this symbol is defined then ENGINE_get_pkey_asn1_meth_engine(), the
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* function that is used by EVP to hook in pkey_asn1_meth code and cache
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* defaults (etc), will display brief debugging summaries to stderr with the
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* 'nid'.
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*/
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/* #define ENGINE_PKEY_ASN1_METH_DEBUG */
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static ENGINE_TABLE *pkey_asn1_meth_table = NULL;
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void ENGINE_unregister_pkey_asn1_meths(ENGINE *e)
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{
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engine_table_unregister(&pkey_asn1_meth_table, e);
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}
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static void engine_unregister_all_pkey_asn1_meths(void)
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{
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engine_table_cleanup(&pkey_asn1_meth_table);
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}
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int ENGINE_register_pkey_asn1_meths(ENGINE *e)
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{
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if (e->pkey_asn1_meths) {
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const int *nids;
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int num_nids = e->pkey_asn1_meths(e, NULL, &nids, 0);
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if (num_nids > 0)
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return engine_table_register(&pkey_asn1_meth_table,
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engine_unregister_all_pkey_asn1_meths,
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e, nids, num_nids, 0);
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}
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return 1;
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}
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void ENGINE_register_all_pkey_asn1_meths(void)
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{
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ENGINE *e;
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for (e = ENGINE_get_first(); e; e = ENGINE_get_next(e))
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ENGINE_register_pkey_asn1_meths(e);
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}
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int ENGINE_set_default_pkey_asn1_meths(ENGINE *e)
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{
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if (e->pkey_asn1_meths) {
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const int *nids;
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int num_nids = e->pkey_asn1_meths(e, NULL, &nids, 0);
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if (num_nids > 0)
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return engine_table_register(&pkey_asn1_meth_table,
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engine_unregister_all_pkey_asn1_meths,
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e, nids, num_nids, 1);
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}
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return 1;
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}
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/*
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* Exposed API function to get a functional reference from the implementation
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* table (ie. try to get a functional reference from the tabled structural
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* references) for a given pkey_asn1_meth 'nid'
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*/
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ENGINE *ENGINE_get_pkey_asn1_meth_engine(int nid)
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{
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return engine_table_select(&pkey_asn1_meth_table, nid);
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}
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/*
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* Obtains a pkey_asn1_meth implementation from an ENGINE functional
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* reference
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*/
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const EVP_PKEY_ASN1_METHOD *ENGINE_get_pkey_asn1_meth(ENGINE *e, int nid)
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{
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EVP_PKEY_ASN1_METHOD *ret;
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ENGINE_PKEY_ASN1_METHS_PTR fn = ENGINE_get_pkey_asn1_meths(e);
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if (!fn || !fn(e, &ret, NULL, nid)) {
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ENGINEerr(ENGINE_F_ENGINE_GET_PKEY_ASN1_METH,
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ENGINE_R_UNIMPLEMENTED_PUBLIC_KEY_METHOD);
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return NULL;
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}
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return ret;
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}
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/* Gets the pkey_asn1_meth callback from an ENGINE structure */
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ENGINE_PKEY_ASN1_METHS_PTR ENGINE_get_pkey_asn1_meths(const ENGINE *e)
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{
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return e->pkey_asn1_meths;
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}
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/* Sets the pkey_asn1_meth callback in an ENGINE structure */
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int ENGINE_set_pkey_asn1_meths(ENGINE *e, ENGINE_PKEY_ASN1_METHS_PTR f)
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{
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e->pkey_asn1_meths = f;
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return 1;
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}
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/*
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* Internal function to free up EVP_PKEY_ASN1_METHOD structures before an
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* ENGINE is destroyed
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*/
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void engine_pkey_asn1_meths_free(ENGINE *e)
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{
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int i;
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EVP_PKEY_ASN1_METHOD *pkm;
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if (e->pkey_asn1_meths) {
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const int *pknids;
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int npknids;
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npknids = e->pkey_asn1_meths(e, NULL, &pknids, 0);
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for (i = 0; i < npknids; i++) {
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if (e->pkey_asn1_meths(e, &pkm, NULL, pknids[i])) {
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EVP_PKEY_asn1_free(pkm);
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}
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}
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}
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}
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/*
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* Find a method based on a string. This does a linear search through all
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* implemented algorithms. This is OK in practice because only a small number
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* of algorithms are likely to be implemented in an engine and it is not used
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* for speed critical operations.
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*/
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const EVP_PKEY_ASN1_METHOD *ENGINE_get_pkey_asn1_meth_str(ENGINE *e,
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const char *str,
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int len)
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{
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int i, nidcount;
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const int *nids;
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EVP_PKEY_ASN1_METHOD *ameth;
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if (!e->pkey_asn1_meths)
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return NULL;
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if (len == -1)
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len = strlen(str);
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nidcount = e->pkey_asn1_meths(e, NULL, &nids, 0);
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for (i = 0; i < nidcount; i++) {
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e->pkey_asn1_meths(e, &ameth, NULL, nids[i]);
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if (((int)strlen(ameth->pem_str) == len)
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&& strncasecmp(ameth->pem_str, str, len) == 0)
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return ameth;
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}
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return NULL;
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}
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typedef struct {
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ENGINE *e;
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const EVP_PKEY_ASN1_METHOD *ameth;
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const char *str;
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int len;
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} ENGINE_FIND_STR;
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static void look_str_cb(int nid, STACK_OF(ENGINE) *sk, ENGINE *def, void *arg)
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{
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ENGINE_FIND_STR *lk = arg;
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int i;
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if (lk->ameth)
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return;
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for (i = 0; i < sk_ENGINE_num(sk); i++) {
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ENGINE *e = sk_ENGINE_value(sk, i);
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EVP_PKEY_ASN1_METHOD *ameth;
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e->pkey_asn1_meths(e, &ameth, NULL, nid);
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if (ameth != NULL
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&& ((int)strlen(ameth->pem_str) == lk->len)
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&& strncasecmp(ameth->pem_str, lk->str, lk->len) == 0) {
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lk->e = e;
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lk->ameth = ameth;
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return;
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}
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}
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}
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const EVP_PKEY_ASN1_METHOD *ENGINE_pkey_asn1_find_str(ENGINE **pe,
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const char *str,
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int len)
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{
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ENGINE_FIND_STR fstr;
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fstr.e = NULL;
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fstr.ameth = NULL;
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fstr.str = str;
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fstr.len = len;
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if (!RUN_ONCE(&engine_lock_init, do_engine_lock_init)) {
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ENGINEerr(ENGINE_F_ENGINE_PKEY_ASN1_FIND_STR, ERR_R_MALLOC_FAILURE);
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return NULL;
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}
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CRYPTO_THREAD_write_lock(global_engine_lock);
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engine_table_doall(pkey_asn1_meth_table, look_str_cb, &fstr);
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/* If found obtain a structural reference to engine */
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if (fstr.e) {
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fstr.e->struct_ref++;
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engine_ref_debug(fstr.e, 0, 1);
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}
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*pe = fstr.e;
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CRYPTO_THREAD_unlock(global_engine_lock);
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return fstr.ameth;
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}
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