[331] | 1 | /*
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| 2 | * Copyright 2006-2016 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the OpenSSL license (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | #include "eng_int.h"
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| 11 | #include <openssl/evp.h>
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| 12 | #include "internal/asn1_int.h"
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| 13 |
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| 14 | /*
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| 15 | * If this symbol is defined then ENGINE_get_pkey_asn1_meth_engine(), the
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| 16 | * function that is used by EVP to hook in pkey_asn1_meth code and cache
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| 17 | * defaults (etc), will display brief debugging summaries to stderr with the
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| 18 | * 'nid'.
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| 19 | */
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| 20 | /* #define ENGINE_PKEY_ASN1_METH_DEBUG */
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| 21 |
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| 22 | static ENGINE_TABLE *pkey_asn1_meth_table = NULL;
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| 23 |
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| 24 | void ENGINE_unregister_pkey_asn1_meths(ENGINE *e)
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| 25 | {
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| 26 | engine_table_unregister(&pkey_asn1_meth_table, e);
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| 27 | }
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| 28 |
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| 29 | static void engine_unregister_all_pkey_asn1_meths(void)
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| 30 | {
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| 31 | engine_table_cleanup(&pkey_asn1_meth_table);
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| 32 | }
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| 33 |
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| 34 | int ENGINE_register_pkey_asn1_meths(ENGINE *e)
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| 35 | {
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| 36 | if (e->pkey_asn1_meths) {
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| 37 | const int *nids;
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| 38 | int num_nids = e->pkey_asn1_meths(e, NULL, &nids, 0);
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| 39 | if (num_nids > 0)
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| 40 | return engine_table_register(&pkey_asn1_meth_table,
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| 41 | engine_unregister_all_pkey_asn1_meths,
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| 42 | e, nids, num_nids, 0);
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| 43 | }
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| 44 | return 1;
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| 45 | }
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| 46 |
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| 47 | void ENGINE_register_all_pkey_asn1_meths(void)
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| 48 | {
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| 49 | ENGINE *e;
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| 50 |
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| 51 | for (e = ENGINE_get_first(); e; e = ENGINE_get_next(e))
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| 52 | ENGINE_register_pkey_asn1_meths(e);
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| 53 | }
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| 54 |
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| 55 | int ENGINE_set_default_pkey_asn1_meths(ENGINE *e)
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| 56 | {
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| 57 | if (e->pkey_asn1_meths) {
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| 58 | const int *nids;
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| 59 | int num_nids = e->pkey_asn1_meths(e, NULL, &nids, 0);
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| 60 | if (num_nids > 0)
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| 61 | return engine_table_register(&pkey_asn1_meth_table,
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| 62 | engine_unregister_all_pkey_asn1_meths,
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| 63 | e, nids, num_nids, 1);
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| 64 | }
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| 65 | return 1;
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| 66 | }
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| 67 |
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| 68 | /*
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| 69 | * Exposed API function to get a functional reference from the implementation
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| 70 | * table (ie. try to get a functional reference from the tabled structural
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| 71 | * references) for a given pkey_asn1_meth 'nid'
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| 72 | */
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| 73 | ENGINE *ENGINE_get_pkey_asn1_meth_engine(int nid)
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| 74 | {
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| 75 | return engine_table_select(&pkey_asn1_meth_table, nid);
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| 76 | }
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| 77 |
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| 78 | /*
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| 79 | * Obtains a pkey_asn1_meth implementation from an ENGINE functional
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| 80 | * reference
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| 81 | */
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| 82 | const EVP_PKEY_ASN1_METHOD *ENGINE_get_pkey_asn1_meth(ENGINE *e, int nid)
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| 83 | {
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| 84 | EVP_PKEY_ASN1_METHOD *ret;
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| 85 | ENGINE_PKEY_ASN1_METHS_PTR fn = ENGINE_get_pkey_asn1_meths(e);
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| 86 | if (!fn || !fn(e, &ret, NULL, nid)) {
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| 87 | ENGINEerr(ENGINE_F_ENGINE_GET_PKEY_ASN1_METH,
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| 88 | ENGINE_R_UNIMPLEMENTED_PUBLIC_KEY_METHOD);
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| 89 | return NULL;
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| 90 | }
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| 91 | return ret;
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| 92 | }
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| 93 |
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| 94 | /* Gets the pkey_asn1_meth callback from an ENGINE structure */
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| 95 | ENGINE_PKEY_ASN1_METHS_PTR ENGINE_get_pkey_asn1_meths(const ENGINE *e)
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| 96 | {
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| 97 | return e->pkey_asn1_meths;
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| 98 | }
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| 99 |
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| 100 | /* Sets the pkey_asn1_meth callback in an ENGINE structure */
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| 101 | int ENGINE_set_pkey_asn1_meths(ENGINE *e, ENGINE_PKEY_ASN1_METHS_PTR f)
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| 102 | {
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| 103 | e->pkey_asn1_meths = f;
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| 104 | return 1;
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| 105 | }
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| 106 |
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| 107 | /*
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| 108 | * Internal function to free up EVP_PKEY_ASN1_METHOD structures before an
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| 109 | * ENGINE is destroyed
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| 110 | */
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| 111 |
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| 112 | void engine_pkey_asn1_meths_free(ENGINE *e)
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| 113 | {
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| 114 | int i;
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| 115 | EVP_PKEY_ASN1_METHOD *pkm;
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| 116 | if (e->pkey_asn1_meths) {
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| 117 | const int *pknids;
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| 118 | int npknids;
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| 119 | npknids = e->pkey_asn1_meths(e, NULL, &pknids, 0);
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| 120 | for (i = 0; i < npknids; i++) {
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| 121 | if (e->pkey_asn1_meths(e, &pkm, NULL, pknids[i])) {
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| 122 | EVP_PKEY_asn1_free(pkm);
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| 123 | }
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| 124 | }
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| 125 | }
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| 126 | }
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| 127 |
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| 128 | /*
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| 129 | * Find a method based on a string. This does a linear search through all
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| 130 | * implemented algorithms. This is OK in practice because only a small number
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| 131 | * of algorithms are likely to be implemented in an engine and it is not used
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| 132 | * for speed critical operations.
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| 133 | */
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| 134 |
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| 135 | const EVP_PKEY_ASN1_METHOD *ENGINE_get_pkey_asn1_meth_str(ENGINE *e,
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| 136 | const char *str,
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| 137 | int len)
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| 138 | {
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| 139 | int i, nidcount;
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| 140 | const int *nids;
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| 141 | EVP_PKEY_ASN1_METHOD *ameth;
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| 142 | if (!e->pkey_asn1_meths)
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| 143 | return NULL;
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| 144 | if (len == -1)
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| 145 | len = strlen(str);
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| 146 | nidcount = e->pkey_asn1_meths(e, NULL, &nids, 0);
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| 147 | for (i = 0; i < nidcount; i++) {
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| 148 | e->pkey_asn1_meths(e, &ameth, NULL, nids[i]);
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| 149 | if (((int)strlen(ameth->pem_str) == len)
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| 150 | && strncasecmp(ameth->pem_str, str, len) == 0)
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| 151 | return ameth;
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| 152 | }
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| 153 | return NULL;
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| 154 | }
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| 155 |
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| 156 | typedef struct {
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| 157 | ENGINE *e;
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| 158 | const EVP_PKEY_ASN1_METHOD *ameth;
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| 159 | const char *str;
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| 160 | int len;
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| 161 | } ENGINE_FIND_STR;
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| 162 |
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| 163 | static void look_str_cb(int nid, STACK_OF(ENGINE) *sk, ENGINE *def, void *arg)
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| 164 | {
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| 165 | ENGINE_FIND_STR *lk = arg;
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| 166 | int i;
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| 167 | if (lk->ameth)
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| 168 | return;
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| 169 | for (i = 0; i < sk_ENGINE_num(sk); i++) {
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| 170 | ENGINE *e = sk_ENGINE_value(sk, i);
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| 171 | EVP_PKEY_ASN1_METHOD *ameth;
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| 172 | e->pkey_asn1_meths(e, &ameth, NULL, nid);
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| 173 | if (((int)strlen(ameth->pem_str) == lk->len)
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| 174 | && strncasecmp(ameth->pem_str, lk->str, lk->len) == 0) {
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| 175 | lk->e = e;
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| 176 | lk->ameth = ameth;
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| 177 | return;
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| 178 | }
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| 179 | }
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| 180 | }
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| 181 |
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| 182 | const EVP_PKEY_ASN1_METHOD *ENGINE_pkey_asn1_find_str(ENGINE **pe,
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| 183 | const char *str,
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| 184 | int len)
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| 185 | {
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| 186 | ENGINE_FIND_STR fstr;
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| 187 | fstr.e = NULL;
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| 188 | fstr.ameth = NULL;
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| 189 | fstr.str = str;
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| 190 | fstr.len = len;
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| 191 |
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| 192 | if (!RUN_ONCE(&engine_lock_init, do_engine_lock_init)) {
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| 193 | ENGINEerr(ENGINE_F_ENGINE_PKEY_ASN1_FIND_STR, ERR_R_MALLOC_FAILURE);
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| 194 | return NULL;
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| 195 | }
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| 196 |
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| 197 | CRYPTO_THREAD_write_lock(global_engine_lock);
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| 198 | engine_table_doall(pkey_asn1_meth_table, look_str_cb, &fstr);
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| 199 | /* If found obtain a structural reference to engine */
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| 200 | if (fstr.e) {
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| 201 | fstr.e->struct_ref++;
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| 202 | engine_ref_debug(fstr.e, 0, 1);
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| 203 | }
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| 204 | *pe = fstr.e;
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| 205 | CRYPTO_THREAD_unlock(global_engine_lock);
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| 206 | return fstr.ameth;
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| 207 | }
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