static int remove_session_lock(SSL_CTX *ctx, SSL_SESSION *session, int lock) {
int ret = 0;
if (session != NULL && session->session_id_length != 0) {
if (lock) {
CRYPTO_MUTEX_lock_write(&ctx->lock);
}
SSL_SESSION *found_session = lh_SSL_SESSION_retrieve(ctx->sessions,
session);
if (found_session == session) {
ret = 1;
found_session = lh_SSL_SESSION_delete(ctx->sessions, session);
SSL_SESSION_list_remove(ctx, session);
}
if (lock) {
CRYPTO_MUTEX_unlock(&ctx->lock);
}
if (ret) {
found_session->not_resumable = 1;
if (ctx->remove_session_cb != NULL) {
ctx->remove_session_cb(ctx, found_session);
}
SSL_SESSION_free(found_session);
}
}
return ret;
}
int BN_MONT_CTX_set_locked(BN_MONT_CTX **pmont, CRYPTO_MUTEX *lock,
const BIGNUM *mod, BN_CTX *bn_ctx) {
CRYPTO_MUTEX_lock_read(lock);
BN_MONT_CTX *ctx = *pmont;
CRYPTO_MUTEX_unlock_read(lock);
if (ctx) {
return 1;
}
CRYPTO_MUTEX_lock_write(lock);
ctx = *pmont;
if (ctx) {
goto out;
}
ctx = BN_MONT_CTX_new();
if (ctx == NULL) {
goto out;
}
if (!BN_MONT_CTX_set(ctx, mod, bn_ctx)) {
BN_MONT_CTX_free(ctx);
ctx = NULL;
goto out;
}
*pmont = ctx;
out:
CRYPTO_MUTEX_unlock_write(lock);
return ctx != NULL;
}
int X509_STORE_add_crl(X509_STORE *ctx, X509_CRL *x)
{
X509_OBJECT *obj;
int ret = 1;
if (x == NULL)
return 0;
obj = (X509_OBJECT *)OPENSSL_malloc(sizeof(X509_OBJECT));
if (obj == NULL) {
OPENSSL_PUT_ERROR(X509, ERR_R_MALLOC_FAILURE);
return 0;
}
obj->type = X509_LU_CRL;
obj->data.crl = x;
CRYPTO_MUTEX_lock_write(&ctx->objs_lock);
X509_OBJECT_up_ref_count(obj);
if (X509_OBJECT_retrieve_match(ctx->objs, obj)) {
X509_OBJECT_free_contents(obj);
OPENSSL_free(obj);
OPENSSL_PUT_ERROR(X509, X509_R_CERT_ALREADY_IN_HASH_TABLE);
ret = 0;
} else if (!sk_X509_OBJECT_push(ctx->objs, obj)) {
X509_OBJECT_free_contents(obj);
OPENSSL_free(obj);
OPENSSL_PUT_ERROR(X509, ERR_R_MALLOC_FAILURE);
ret = 0;
}
CRYPTO_MUTEX_unlock_write(&ctx->objs_lock);
return ret;
}
int X509_STORE_get_by_subject(X509_STORE_CTX *vs, int type, X509_NAME *name,
X509_OBJECT *ret)
{
X509_STORE *ctx = vs->ctx;
X509_LOOKUP *lu;
X509_OBJECT stmp, *tmp;
int i;
CRYPTO_MUTEX_lock_write(&ctx->objs_lock);
tmp = X509_OBJECT_retrieve_by_subject(ctx->objs, type, name);
CRYPTO_MUTEX_unlock_write(&ctx->objs_lock);
if (tmp == NULL || type == X509_LU_CRL) {
for (i = 0; i < (int)sk_X509_LOOKUP_num(ctx->get_cert_methods); i++) {
lu = sk_X509_LOOKUP_value(ctx->get_cert_methods, i);
if (X509_LOOKUP_by_subject(lu, type, name, &stmp)) {
tmp = &stmp;
break;
}
}
if (tmp == NULL)
return 0;
}
/*
* if (ret->data.ptr != NULL) X509_OBJECT_free_contents(ret);
*/
ret->type = tmp->type;
ret->data.ptr = tmp->data.ptr;
X509_OBJECT_up_ref_count(ret);
return 1;
}
static int remove_session_lock(SSL_CTX *ctx, SSL_SESSION *c, int lock) {
SSL_SESSION *r;
int ret = 0;
if (c != NULL && c->session_id_length != 0) {
if (lock) {
CRYPTO_MUTEX_lock_write(&ctx->lock);
}
r = lh_SSL_SESSION_retrieve(ctx->sessions, c);
if (r == c) {
ret = 1;
r = lh_SSL_SESSION_delete(ctx->sessions, c);
SSL_SESSION_list_remove(ctx, c);
}
if (lock) {
CRYPTO_MUTEX_unlock(&ctx->lock);
}
if (ret) {
r->not_resumable = 1;
if (ctx->remove_session_cb != NULL) {
ctx->remove_session_cb(ctx, r);
}
SSL_SESSION_free(r);
}
}
return ret;
}
int SSL_CTX_add_session(SSL_CTX *ctx, SSL_SESSION *c) {
int ret = 0;
SSL_SESSION *s;
/* add just 1 reference count for the SSL_CTX's session cache even though it
* has two ways of access: each session is in a doubly linked list and an
* lhash */
SSL_SESSION_up_ref(c);
/* if session c is in already in cache, we take back the increment later */
CRYPTO_MUTEX_lock_write(&ctx->lock);
if (!lh_SSL_SESSION_insert(ctx->sessions, &s, c)) {
CRYPTO_MUTEX_unlock(&ctx->lock);
return 0;
}
/* s != NULL iff we already had a session with the given PID. In this case, s
* == c should hold (then we did not really modify ctx->sessions), or we're
* in trouble. */
if (s != NULL && s != c) {
/* We *are* in trouble ... */
SSL_SESSION_list_remove(ctx, s);
SSL_SESSION_free(s);
/* ... so pretend the other session did not exist in cache (we cannot
* handle two SSL_SESSION structures with identical session ID in the same
* cache, which could happen e.g. when two threads concurrently obtain the
* same session from an external cache) */
s = NULL;
}
/* Put at the head of the queue unless it is already in the cache */
if (s == NULL) {
SSL_SESSION_list_add(ctx, c);
}
if (s != NULL) {
/* existing cache entry -- decrement previously incremented reference count
* because it already takes into account the cache */
SSL_SESSION_free(s); /* s == c */
ret = 0;
} else {
/* new cache entry -- remove old ones if cache has become too large */
ret = 1;
if (SSL_CTX_sess_get_cache_size(ctx) > 0) {
while (SSL_CTX_sess_number(ctx) > SSL_CTX_sess_get_cache_size(ctx)) {
if (!remove_session_lock(ctx, ctx->session_cache_tail, 0)) {
break;
}
}
}
}
CRYPTO_MUTEX_unlock(&ctx->lock);
return ret;
}
/* rsa_blinding_release marks the cached BN_BLINDING at the given index as free
* for other threads to use. */
static void rsa_blinding_release(RSA *rsa, BN_BLINDING *blinding,
unsigned blinding_index) {
if (blinding_index == MAX_BLINDINGS_PER_RSA) {
/* This blinding wasn't cached. */
BN_BLINDING_free(blinding);
return;
}
CRYPTO_MUTEX_lock_write(&rsa->lock);
rsa->blindings_inuse[blinding_index] = 0;
CRYPTO_MUTEX_unlock_write(&rsa->lock);
}
void SSL_CTX_flush_sessions(SSL_CTX *ctx, long time) {
TIMEOUT_PARAM tp;
tp.ctx = ctx;
tp.cache = ctx->sessions;
if (tp.cache == NULL) {
return;
}
tp.time = time;
CRYPTO_MUTEX_lock_write(&ctx->lock);
lh_SSL_SESSION_doall_arg(tp.cache, timeout_doall_arg, &tp);
CRYPTO_MUTEX_unlock(&ctx->lock);
}
void CRYPTO_BUFFER_POOL_free(CRYPTO_BUFFER_POOL *pool) {
if (pool == NULL) {
return;
}
#if !defined(NDEBUG)
CRYPTO_MUTEX_lock_write(&pool->lock);
assert(lh_CRYPTO_BUFFER_num_items(pool->bufs) == 0);
CRYPTO_MUTEX_unlock_write(&pool->lock);
#endif
lh_CRYPTO_BUFFER_free(pool->bufs);
CRYPTO_MUTEX_cleanup(&pool->lock);
OPENSSL_free(pool);
}
int SSL_CTX_add_session(SSL_CTX *ctx, SSL_SESSION *session) {
/* Although |session| is inserted into two structures (a doubly-linked list
* and the hash table), |ctx| only takes one reference. */
SSL_SESSION_up_ref(session);
SSL_SESSION *old_session;
CRYPTO_MUTEX_lock_write(&ctx->lock);
if (!lh_SSL_SESSION_insert(ctx->sessions, &old_session, session)) {
CRYPTO_MUTEX_unlock(&ctx->lock);
SSL_SESSION_free(session);
return 0;
}
if (old_session != NULL) {
if (old_session == session) {
/* |session| was already in the cache. */
CRYPTO_MUTEX_unlock(&ctx->lock);
SSL_SESSION_free(old_session);
return 0;
}
/* There was a session ID collision. |old_session| must be removed from
* the linked list and released. */
SSL_SESSION_list_remove(ctx, old_session);
SSL_SESSION_free(old_session);
}
SSL_SESSION_list_add(ctx, session);
/* Enforce any cache size limits. */
if (SSL_CTX_sess_get_cache_size(ctx) > 0) {
while (SSL_CTX_sess_number(ctx) > SSL_CTX_sess_get_cache_size(ctx)) {
if (!remove_session_lock(ctx, ctx->session_cache_tail, 0)) {
break;
}
}
}
CRYPTO_MUTEX_unlock(&ctx->lock);
return 1;
}
void CRYPTO_BUFFER_free(CRYPTO_BUFFER *buf) {
if (buf == NULL) {
return;
}
CRYPTO_BUFFER_POOL *const pool = buf->pool;
if (pool == NULL) {
if (CRYPTO_refcount_dec_and_test_zero(&buf->references)) {
// If a reference count of zero is observed, there cannot be a reference
// from any pool to this buffer and thus we are able to free this
// buffer.
OPENSSL_free(buf->data);
OPENSSL_free(buf);
}
return;
}
CRYPTO_MUTEX_lock_write(&pool->lock);
if (!CRYPTO_refcount_dec_and_test_zero(&buf->references)) {
CRYPTO_MUTEX_unlock_write(&buf->pool->lock);
return;
}
// We have an exclusive lock on the pool, therefore no concurrent lookups can
// find this buffer and increment the reference count. Thus, if the count is
// zero there are and can never be any more references and thus we can free
// this buffer.
void *found = lh_CRYPTO_BUFFER_delete(pool->bufs, buf);
assert(found != NULL);
assert(found == buf);
(void)found;
CRYPTO_MUTEX_unlock_write(&buf->pool->lock);
OPENSSL_free(buf->data);
OPENSSL_free(buf);
}
/* rsa_blinding_get returns a BN_BLINDING to use with |rsa|. It does this by
* allocating one of the cached BN_BLINDING objects in |rsa->blindings|. If
* none are free, the cache will be extended by a extra element and the new
* BN_BLINDING is returned.
*
* On success, the index of the assigned BN_BLINDING is written to
* |*index_used| and must be passed to |rsa_blinding_release| when finished. */
static BN_BLINDING *rsa_blinding_get(RSA *rsa, unsigned *index_used,
BN_CTX *ctx) {
assert(ctx != NULL);
assert(rsa->mont_n != NULL);
BN_BLINDING *ret = NULL;
BN_BLINDING **new_blindings;
uint8_t *new_blindings_inuse;
char overflow = 0;
CRYPTO_MUTEX_lock_write(&rsa->lock);
unsigned i;
for (i = 0; i < rsa->num_blindings; i++) {
if (rsa->blindings_inuse[i] == 0) {
rsa->blindings_inuse[i] = 1;
ret = rsa->blindings[i];
*index_used = i;
break;
}
}
if (ret != NULL) {
CRYPTO_MUTEX_unlock_write(&rsa->lock);
return ret;
}
overflow = rsa->num_blindings >= MAX_BLINDINGS_PER_RSA;
/* We didn't find a free BN_BLINDING to use so increase the length of
* the arrays by one and use the newly created element. */
CRYPTO_MUTEX_unlock_write(&rsa->lock);
ret = BN_BLINDING_new();
if (ret == NULL) {
return NULL;
}
if (overflow) {
/* We cannot add any more cached BN_BLINDINGs so we use |ret|
* and mark it for destruction in |rsa_blinding_release|. */
*index_used = MAX_BLINDINGS_PER_RSA;
return ret;
}
CRYPTO_MUTEX_lock_write(&rsa->lock);
new_blindings =
OPENSSL_malloc(sizeof(BN_BLINDING *) * (rsa->num_blindings + 1));
if (new_blindings == NULL) {
goto err1;
}
memcpy(new_blindings, rsa->blindings,
sizeof(BN_BLINDING *) * rsa->num_blindings);
new_blindings[rsa->num_blindings] = ret;
new_blindings_inuse = OPENSSL_malloc(rsa->num_blindings + 1);
if (new_blindings_inuse == NULL) {
goto err2;
}
memcpy(new_blindings_inuse, rsa->blindings_inuse, rsa->num_blindings);
new_blindings_inuse[rsa->num_blindings] = 1;
*index_used = rsa->num_blindings;
OPENSSL_free(rsa->blindings);
rsa->blindings = new_blindings;
OPENSSL_free(rsa->blindings_inuse);
rsa->blindings_inuse = new_blindings_inuse;
rsa->num_blindings++;
CRYPTO_MUTEX_unlock_write(&rsa->lock);
return ret;
err2:
OPENSSL_free(new_blindings);
err1:
CRYPTO_MUTEX_unlock_write(&rsa->lock);
BN_BLINDING_free(ret);
return NULL;
}
// freeze_private_key finishes initializing |rsa|'s private key components.
// After this function has returned, |rsa| may not be changed. This is needed
// because |RSA| is a public struct and, additionally, OpenSSL 1.1.0 opaquified
// it wrong (see https://github.com/openssl/openssl/issues/5158).
static int freeze_private_key(RSA *rsa, BN_CTX *ctx) {
CRYPTO_MUTEX_lock_read(&rsa->lock);
int frozen = rsa->private_key_frozen;
CRYPTO_MUTEX_unlock_read(&rsa->lock);
if (frozen) {
return 1;
}
int ret = 0;
CRYPTO_MUTEX_lock_write(&rsa->lock);
if (rsa->private_key_frozen) {
ret = 1;
goto err;
}
// Pre-compute various intermediate values, as well as copies of private
// exponents with correct widths. Note that other threads may concurrently
// read from |rsa->n|, |rsa->e|, etc., so any fixes must be in separate
// copies. We use |mont_n->N|, |mont_p->N|, and |mont_q->N| as copies of |n|,
// |p|, and |q| with the correct minimal widths.
if (rsa->mont_n == NULL) {
rsa->mont_n = BN_MONT_CTX_new_for_modulus(rsa->n, ctx);
if (rsa->mont_n == NULL) {
goto err;
}
}
const BIGNUM *n_fixed = &rsa->mont_n->N;
// The only public upper-bound of |rsa->d| is the bit length of |rsa->n|. The
// ASN.1 serialization of RSA private keys unfortunately leaks the byte length
// of |rsa->d|, but normalize it so we only leak it once, rather than per
// operation.
if (rsa->d != NULL &&
!ensure_fixed_copy(&rsa->d_fixed, rsa->d, n_fixed->width)) {
goto err;
}
if (rsa->p != NULL && rsa->q != NULL) {
if (rsa->mont_p == NULL) {
rsa->mont_p = BN_MONT_CTX_new_for_modulus(rsa->p, ctx);
if (rsa->mont_p == NULL) {
goto err;
}
}
const BIGNUM *p_fixed = &rsa->mont_p->N;
if (rsa->mont_q == NULL) {
rsa->mont_q = BN_MONT_CTX_new_for_modulus(rsa->q, ctx);
if (rsa->mont_q == NULL) {
goto err;
}
}
const BIGNUM *q_fixed = &rsa->mont_q->N;
if (rsa->dmp1 != NULL && rsa->dmq1 != NULL) {
// Key generation relies on this function to compute |iqmp|.
if (rsa->iqmp == NULL) {
BIGNUM *iqmp = BN_new();
if (iqmp == NULL ||
!bn_mod_inverse_secret_prime(iqmp, rsa->q, rsa->p, ctx,
rsa->mont_p)) {
BN_free(iqmp);
goto err;
}
rsa->iqmp = iqmp;
}
// CRT components are only publicly bounded by their corresponding
// moduli's bit lengths. |rsa->iqmp| is unused outside of this one-time
// setup, so we do not compute a fixed-width version of it.
if (!ensure_fixed_copy(&rsa->dmp1_fixed, rsa->dmp1, p_fixed->width) ||
!ensure_fixed_copy(&rsa->dmq1_fixed, rsa->dmq1, q_fixed->width)) {
goto err;
}
// Compute |inv_small_mod_large_mont|. Note that it is always modulo the
// larger prime, independent of what is stored in |rsa->iqmp|.
if (rsa->inv_small_mod_large_mont == NULL) {
BIGNUM *inv_small_mod_large_mont = BN_new();
int ok;
if (BN_cmp(rsa->p, rsa->q) < 0) {
ok = inv_small_mod_large_mont != NULL &&
bn_mod_inverse_secret_prime(inv_small_mod_large_mont, rsa->p,
rsa->q, ctx, rsa->mont_q) &&
BN_to_montgomery(inv_small_mod_large_mont,
inv_small_mod_large_mont, rsa->mont_q, ctx);
} else {
ok = inv_small_mod_large_mont != NULL &&
BN_to_montgomery(inv_small_mod_large_mont, rsa->iqmp,
rsa->mont_p, ctx);
}
if (!ok) {
BN_free(inv_small_mod_large_mont);
goto err;
}
rsa->inv_small_mod_large_mont = inv_small_mod_large_mont;
}
}
}
rsa->private_key_frozen = 1;
ret = 1;
err:
CRYPTO_MUTEX_unlock_write(&rsa->lock);
return ret;
}
CRYPTO_BUFFER *CRYPTO_BUFFER_new(const uint8_t *data, size_t len,
CRYPTO_BUFFER_POOL *pool) {
if (pool != NULL) {
CRYPTO_BUFFER tmp;
tmp.data = (uint8_t *) data;
tmp.len = len;
CRYPTO_MUTEX_lock_read(&pool->lock);
CRYPTO_BUFFER *const duplicate =
lh_CRYPTO_BUFFER_retrieve(pool->bufs, &tmp);
if (duplicate != NULL) {
CRYPTO_refcount_inc(&duplicate->references);
}
CRYPTO_MUTEX_unlock_read(&pool->lock);
if (duplicate != NULL) {
return duplicate;
}
}
CRYPTO_BUFFER *const buf = OPENSSL_malloc(sizeof(CRYPTO_BUFFER));
if (buf == NULL) {
return NULL;
}
OPENSSL_memset(buf, 0, sizeof(CRYPTO_BUFFER));
buf->data = BUF_memdup(data, len);
if (len != 0 && buf->data == NULL) {
OPENSSL_free(buf);
return NULL;
}
buf->len = len;
buf->references = 1;
if (pool == NULL) {
return buf;
}
buf->pool = pool;
CRYPTO_MUTEX_lock_write(&pool->lock);
CRYPTO_BUFFER *duplicate = lh_CRYPTO_BUFFER_retrieve(pool->bufs, buf);
int inserted = 0;
if (duplicate == NULL) {
CRYPTO_BUFFER *old = NULL;
inserted = lh_CRYPTO_BUFFER_insert(pool->bufs, &old, buf);
assert(old == NULL);
} else {
CRYPTO_refcount_inc(&duplicate->references);
}
CRYPTO_MUTEX_unlock_write(&pool->lock);
if (!inserted) {
// We raced to insert |buf| into the pool and lost, or else there was an
// error inserting.
OPENSSL_free(buf->data);
OPENSSL_free(buf);
return duplicate;
}
return buf;
}
// freeze_private_key finishes initializing |rsa|'s private key components.
// After this function has returned, |rsa| may not be changed. This is needed
// because |RSA| is a public struct and, additionally, OpenSSL 1.1.0 opaquified
// it wrong (see https://github.com/openssl/openssl/issues/5158).
static int freeze_private_key(RSA *rsa, BN_CTX *ctx) {
CRYPTO_MUTEX_lock_read(&rsa->lock);
int flags = rsa->flags;
CRYPTO_MUTEX_unlock_read(&rsa->lock);
if (flags & RSA_FLAG_PRIVATE_KEY_FROZEN) {
return 1;
}
int ret = 0;
CRYPTO_MUTEX_lock_write(&rsa->lock);
if (rsa->flags & RSA_FLAG_PRIVATE_KEY_FROZEN) {
ret = 1;
goto err;
}
// |rsa->n| is public. Normalize the width.
bn_set_minimal_width(rsa->n);
if (rsa->mont_n == NULL) {
rsa->mont_n = BN_MONT_CTX_new_for_modulus(rsa->n, ctx);
if (rsa->mont_n == NULL) {
goto err;
}
}
// The only public upper-bound of |rsa->d| is the bit length of |rsa->n|. The
// ASN.1 serialization of RSA private keys unfortunately leaks the byte length
// of |rsa->d|, but normalize it so we only leak it once, rather than per
// operation.
if (rsa->d != NULL &&
!bn_resize_words(rsa->d, rsa->n->width)) {
goto err;
}
if (rsa->p != NULL && rsa->q != NULL) {
// |p| and |q| have public bit lengths.
bn_set_minimal_width(rsa->p);
bn_set_minimal_width(rsa->q);
if (rsa->mont_p == NULL) {
rsa->mont_p = BN_MONT_CTX_new_for_modulus(rsa->p, ctx);
if (rsa->mont_p == NULL) {
goto err;
}
}
if (rsa->mont_q == NULL) {
rsa->mont_q = BN_MONT_CTX_new_for_modulus(rsa->q, ctx);
if (rsa->mont_q == NULL) {
goto err;
}
}
if (rsa->dmp1 != NULL && rsa->dmq1 != NULL) {
// Key generation relies on this function to compute |iqmp|.
if (rsa->iqmp == NULL) {
BIGNUM *iqmp = BN_new();
if (iqmp == NULL ||
!bn_mod_inverse_secret_prime(iqmp, rsa->q, rsa->p, ctx,
rsa->mont_p)) {
BN_free(iqmp);
goto err;
}
rsa->iqmp = iqmp;
}
// CRT components are only publicly bounded by their corresponding
// moduli's bit lengths.
if (!bn_resize_words(rsa->dmp1, rsa->p->width) ||
!bn_resize_words(rsa->dmq1, rsa->q->width) ||
!bn_resize_words(rsa->iqmp, rsa->p->width)) {
goto err;
}
// Compute |inv_small_mod_large_mont|. Note that it is always modulo the
// larger prime, independent of what is stored in |rsa->iqmp|.
if (rsa->inv_small_mod_large_mont == NULL) {
BIGNUM *inv_small_mod_large_mont = BN_new();
int ok;
if (BN_cmp(rsa->p, rsa->q) < 0) {
ok = inv_small_mod_large_mont != NULL &&
bn_mod_inverse_secret_prime(inv_small_mod_large_mont, rsa->p,
rsa->q, ctx, rsa->mont_q) &&
BN_to_montgomery(inv_small_mod_large_mont,
inv_small_mod_large_mont, rsa->mont_q, ctx);
} else {
ok = inv_small_mod_large_mont != NULL &&
BN_to_montgomery(inv_small_mod_large_mont, rsa->iqmp,
rsa->mont_p, ctx);
}
if (!ok) {
BN_free(inv_small_mod_large_mont);
goto err;
}
rsa->inv_small_mod_large_mont = inv_small_mod_large_mont;
}
}
}
rsa->flags |= RSA_FLAG_PRIVATE_KEY_FROZEN;
ret = 1;
err:
CRYPTO_MUTEX_unlock_write(&rsa->lock);
return ret;
}