| 1 | /*
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| 2 | * Copyright 2001-2023 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the Apache License 2.0 (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 "internal/cryptlib.h"
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| 11 | #include <openssl/evp.h>
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| 12 | #include <openssl/lhash.h>
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| 13 | #include <openssl/trace.h>
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| 14 | #include "eng_local.h"
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| 15 |
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| 16 | /* The type of the items in the table */
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| 17 | struct st_engine_pile {
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| 18 | /* The 'nid' of this algorithm/mode */
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| 19 | int nid;
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| 20 | /* ENGINEs that implement this algorithm/mode. */
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| 21 | STACK_OF(ENGINE) *sk;
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| 22 | /* The default ENGINE to perform this algorithm/mode. */
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| 23 | ENGINE *funct;
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| 24 | /*
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| 25 | * Zero if 'sk' is newer than the cached 'funct', non-zero otherwise
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| 26 | */
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| 27 | int uptodate;
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| 28 | };
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| 29 |
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| 30 | /* The type exposed in eng_local.h */
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| 31 | struct st_engine_table {
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| 32 | LHASH_OF(ENGINE_PILE) piles;
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| 33 | }; /* ENGINE_TABLE */
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| 34 |
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| 35 | typedef struct st_engine_pile_doall {
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| 36 | engine_table_doall_cb *cb;
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| 37 | void *arg;
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| 38 | } ENGINE_PILE_DOALL;
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| 39 |
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| 40 | /* Global flags (ENGINE_TABLE_FLAG_***). */
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| 41 | static unsigned int table_flags = 0;
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| 42 |
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| 43 | /* API function manipulating 'table_flags' */
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| 44 | unsigned int ENGINE_get_table_flags(void)
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| 45 | {
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| 46 | return table_flags;
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| 47 | }
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| 48 |
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| 49 | void ENGINE_set_table_flags(unsigned int flags)
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| 50 | {
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| 51 | table_flags = flags;
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| 52 | }
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| 53 |
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| 54 | /* Internal functions for the "piles" hash table */
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| 55 | static unsigned long engine_pile_hash(const ENGINE_PILE *c)
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| 56 | {
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| 57 | return c->nid;
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| 58 | }
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| 59 |
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| 60 | static int engine_pile_cmp(const ENGINE_PILE *a, const ENGINE_PILE *b)
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| 61 | {
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| 62 | return a->nid - b->nid;
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| 63 | }
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| 64 |
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| 65 | static int int_table_check(ENGINE_TABLE **t, int create)
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| 66 | {
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| 67 | LHASH_OF(ENGINE_PILE) *lh;
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| 68 |
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| 69 | if (*t)
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| 70 | return 1;
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| 71 | if (!create)
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| 72 | return 0;
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| 73 | if ((lh = lh_ENGINE_PILE_new(engine_pile_hash, engine_pile_cmp)) == NULL)
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| 74 | return 0;
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| 75 | *t = (ENGINE_TABLE *)lh;
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| 76 | return 1;
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| 77 | }
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| 78 |
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| 79 | /*
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| 80 | * Privately exposed (via eng_local.h) functions for adding and/or removing
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| 81 | * ENGINEs from the implementation table
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| 82 | */
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| 83 | int engine_table_register(ENGINE_TABLE **table, ENGINE_CLEANUP_CB *cleanup,
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| 84 | ENGINE *e, const int *nids, int num_nids,
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| 85 | int setdefault)
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| 86 | {
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| 87 | int ret = 0, added = 0;
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| 88 | ENGINE_PILE tmplate, *fnd;
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| 89 |
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| 90 | if (!CRYPTO_THREAD_write_lock(global_engine_lock))
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| 91 | return 0;
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| 92 | if (!(*table))
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| 93 | added = 1;
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| 94 | if (!int_table_check(table, 1))
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| 95 | goto end;
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| 96 | /* The cleanup callback needs to be added */
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| 97 | if (added && !engine_cleanup_add_first(cleanup)) {
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| 98 | lh_ENGINE_PILE_free(&(*table)->piles);
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| 99 | *table = NULL;
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| 100 | }
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| 101 | while (num_nids--) {
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| 102 | tmplate.nid = *nids;
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| 103 | fnd = lh_ENGINE_PILE_retrieve(&(*table)->piles, &tmplate);
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| 104 | if (!fnd) {
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| 105 | fnd = OPENSSL_malloc(sizeof(*fnd));
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| 106 | if (fnd == NULL)
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| 107 | goto end;
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| 108 | fnd->uptodate = 1;
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| 109 | fnd->nid = *nids;
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| 110 | fnd->sk = sk_ENGINE_new_null();
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| 111 | if (!fnd->sk) {
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| 112 | OPENSSL_free(fnd);
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| 113 | goto end;
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| 114 | }
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| 115 | fnd->funct = NULL;
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| 116 | (void)lh_ENGINE_PILE_insert(&(*table)->piles, fnd);
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| 117 | if (lh_ENGINE_PILE_retrieve(&(*table)->piles, &tmplate) != fnd) {
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| 118 | sk_ENGINE_free(fnd->sk);
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| 119 | OPENSSL_free(fnd);
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| 120 | goto end;
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| 121 | }
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| 122 | }
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| 123 | /* A registration shouldn't add duplicate entries */
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| 124 | (void)sk_ENGINE_delete_ptr(fnd->sk, e);
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| 125 | /*
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| 126 | * if 'setdefault', this ENGINE goes to the head of the list
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| 127 | */
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| 128 | if (!sk_ENGINE_push(fnd->sk, e))
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| 129 | goto end;
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| 130 | /* "touch" this ENGINE_PILE */
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| 131 | fnd->uptodate = 0;
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| 132 | if (setdefault) {
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| 133 | if (!engine_unlocked_init(e)) {
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| 134 | ERR_raise(ERR_LIB_ENGINE, ENGINE_R_INIT_FAILED);
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| 135 | goto end;
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| 136 | }
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| 137 | if (fnd->funct)
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| 138 | engine_unlocked_finish(fnd->funct, 0);
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| 139 | fnd->funct = e;
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| 140 | fnd->uptodate = 1;
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| 141 | }
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| 142 | nids++;
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| 143 | }
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| 144 | ret = 1;
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| 145 | end:
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| 146 | CRYPTO_THREAD_unlock(global_engine_lock);
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| 147 | return ret;
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| 148 | }
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| 149 |
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| 150 | static void int_unregister_cb(ENGINE_PILE *pile, ENGINE *e)
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| 151 | {
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| 152 | int n;
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| 153 | /* Iterate the 'c->sk' stack removing any occurrence of 'e' */
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| 154 | while ((n = sk_ENGINE_find(pile->sk, e)) >= 0) {
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| 155 | (void)sk_ENGINE_delete(pile->sk, n);
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| 156 | pile->uptodate = 0;
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| 157 | }
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| 158 | if (pile->funct == e) {
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| 159 | engine_unlocked_finish(e, 0);
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| 160 | pile->funct = NULL;
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| 161 | }
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| 162 | }
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| 163 |
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| 164 | IMPLEMENT_LHASH_DOALL_ARG(ENGINE_PILE, ENGINE);
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| 165 |
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| 166 | void engine_table_unregister(ENGINE_TABLE **table, ENGINE *e)
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| 167 | {
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| 168 | if (!CRYPTO_THREAD_write_lock(global_engine_lock))
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| 169 | /* Can't return a value. :( */
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| 170 | return;
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| 171 | if (int_table_check(table, 0))
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| 172 | lh_ENGINE_PILE_doall_ENGINE(&(*table)->piles, int_unregister_cb, e);
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| 173 | CRYPTO_THREAD_unlock(global_engine_lock);
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| 174 | }
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| 175 |
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| 176 | static void int_cleanup_cb_doall(ENGINE_PILE *p)
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| 177 | {
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| 178 | if (p == NULL)
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| 179 | return;
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| 180 | sk_ENGINE_free(p->sk);
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| 181 | if (p->funct)
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| 182 | engine_unlocked_finish(p->funct, 0);
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| 183 | OPENSSL_free(p);
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| 184 | }
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| 185 |
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| 186 | void engine_table_cleanup(ENGINE_TABLE **table)
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| 187 | {
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| 188 | if (!CRYPTO_THREAD_write_lock(global_engine_lock))
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| 189 | return;
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| 190 | if (*table) {
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| 191 | lh_ENGINE_PILE_doall(&(*table)->piles, int_cleanup_cb_doall);
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| 192 | lh_ENGINE_PILE_free(&(*table)->piles);
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| 193 | *table = NULL;
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| 194 | }
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| 195 | CRYPTO_THREAD_unlock(global_engine_lock);
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| 196 | }
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| 197 |
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| 198 | /* return a functional reference for a given 'nid' */
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| 199 | ENGINE *ossl_engine_table_select(ENGINE_TABLE **table, int nid,
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| 200 | const char *f, int l)
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| 201 | {
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| 202 | ENGINE *ret = NULL;
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| 203 | ENGINE_PILE tmplate, *fnd = NULL;
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| 204 | int initres, loop = 0;
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| 205 |
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| 206 | #ifndef OPENSSL_NO_AUTOLOAD_CONFIG
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| 207 | /* Load the config before trying to check if engines are available */
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| 208 | OPENSSL_init_crypto(OPENSSL_INIT_LOAD_CONFIG, NULL);
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| 209 | #endif
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| 210 |
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| 211 | if (!(*table)) {
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| 212 | OSSL_TRACE3(ENGINE_TABLE,
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| 213 | "%s:%d, nid=%d, nothing registered!\n",
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| 214 | f, l, nid);
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| 215 | return NULL;
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| 216 | }
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| 217 | ERR_set_mark();
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| 218 | if (!CRYPTO_THREAD_write_lock(global_engine_lock))
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| 219 | goto end;
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| 220 | /*
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| 221 | * Check again inside the lock otherwise we could race against cleanup
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| 222 | * operations. But don't worry about a debug printout
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| 223 | */
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| 224 | if (!int_table_check(table, 0))
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| 225 | goto end;
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| 226 | tmplate.nid = nid;
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| 227 | fnd = lh_ENGINE_PILE_retrieve(&(*table)->piles, &tmplate);
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| 228 | if (!fnd)
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| 229 | goto end;
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| 230 | if (fnd->funct && engine_unlocked_init(fnd->funct)) {
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| 231 | OSSL_TRACE4(ENGINE_TABLE,
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| 232 | "%s:%d, nid=%d, using ENGINE '%s' cached\n",
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| 233 | f, l, nid, fnd->funct->id);
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| 234 | ret = fnd->funct;
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| 235 | goto end;
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| 236 | }
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| 237 | if (fnd->uptodate) {
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| 238 | ret = fnd->funct;
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| 239 | goto end;
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| 240 | }
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| 241 | trynext:
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| 242 | ret = sk_ENGINE_value(fnd->sk, loop++);
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| 243 | if (!ret) {
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| 244 | OSSL_TRACE3(ENGINE_TABLE,
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| 245 | "%s:%d, nid=%d, "
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| 246 | "no registered implementations would initialise\n",
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| 247 | f, l, nid);
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| 248 | goto end;
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| 249 | }
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| 250 | /* Try to initialise the ENGINE? */
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| 251 | if ((ret->funct_ref > 0) || !(table_flags & ENGINE_TABLE_FLAG_NOINIT))
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| 252 | initres = engine_unlocked_init(ret);
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| 253 | else
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| 254 | initres = 0;
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| 255 | if (initres) {
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| 256 | /* Update 'funct' */
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| 257 | if ((fnd->funct != ret) && engine_unlocked_init(ret)) {
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| 258 | /* If there was a previous default we release it. */
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| 259 | if (fnd->funct)
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| 260 | engine_unlocked_finish(fnd->funct, 0);
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| 261 | fnd->funct = ret;
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| 262 | OSSL_TRACE4(ENGINE_TABLE,
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| 263 | "%s:%d, nid=%d, setting default to '%s'\n",
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| 264 | f, l, nid, ret->id);
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| 265 | }
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| 266 | OSSL_TRACE4(ENGINE_TABLE,
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| 267 | "%s:%d, nid=%d, using newly initialised '%s'\n",
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| 268 | f, l, nid, ret->id);
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| 269 | goto end;
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| 270 | }
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| 271 | goto trynext;
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| 272 | end:
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| 273 | /*
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| 274 | * If it failed, it is unlikely to succeed again until some future
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| 275 | * registrations have taken place. In all cases, we cache.
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| 276 | */
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| 277 | if (fnd)
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| 278 | fnd->uptodate = 1;
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| 279 | if (ret)
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| 280 | OSSL_TRACE4(ENGINE_TABLE,
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| 281 | "%s:%d, nid=%d, caching ENGINE '%s'\n",
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| 282 | f, l, nid, ret->id);
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| 283 | else
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| 284 | OSSL_TRACE3(ENGINE_TABLE,
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| 285 | "%s:%d, nid=%d, caching 'no matching ENGINE'\n",
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| 286 | f, l, nid);
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| 287 | CRYPTO_THREAD_unlock(global_engine_lock);
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| 288 | /*
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| 289 | * Whatever happened, any failed init()s are not failures in this
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| 290 | * context, so clear our error state.
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| 291 | */
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| 292 | ERR_pop_to_mark();
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| 293 | return ret;
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| 294 | }
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| 295 |
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| 296 | /* Table enumeration */
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| 297 |
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| 298 | static void int_dall(const ENGINE_PILE *pile, ENGINE_PILE_DOALL *dall)
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| 299 | {
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| 300 | dall->cb(pile->nid, pile->sk, pile->funct, dall->arg);
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| 301 | }
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| 302 |
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| 303 | IMPLEMENT_LHASH_DOALL_ARG_CONST(ENGINE_PILE, ENGINE_PILE_DOALL);
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| 304 |
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| 305 | void engine_table_doall(ENGINE_TABLE *table, engine_table_doall_cb *cb,
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| 306 | void *arg)
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| 307 | {
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| 308 | ENGINE_PILE_DOALL dall;
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| 309 | dall.cb = cb;
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| 310 | dall.arg = arg;
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| 311 | if (table)
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| 312 | lh_ENGINE_PILE_doall_ENGINE_PILE_DOALL(&table->piles, int_dall, &dall);
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| 313 | }
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