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SSL: caching certificates.

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Certificate chains are now loaded once.

The certificate cache provides each chain as a unique stack of reference
counted elements.  This shallow copy is required because OpenSSL stacks
aren't reference counted.

Based on previous work by Mini Hawthorne.
This commit is contained in:
Sergey Kandaurov 2024-09-09 19:03:52 +04:00 committed by pluknet
parent 7d7e8d2cb8
commit 78ed123e71
3 changed files with 173 additions and 102 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

105
src/event/ngx_event_openssl.c
View File

@ -18,8 +18,6 @@ typedef struct {
} ngx_openssl_conf_t;
static X509 *ngx_ssl_load_certificate(ngx_pool_t *pool, char **err,
ngx_str_t *cert, STACK_OF(X509) **chain);
static EVP_PKEY *ngx_ssl_load_certificate_key(ngx_pool_t *pool, char **err,
ngx_str_t *key, ngx_array_t *passwords);
static int ngx_ssl_password_callback(char *buf, int size, int rwflag,
@ -449,8 +447,8 @@ ngx_ssl_certificate(ngx_conf_t *cf, ngx_ssl_t *ssl, ngx_str_t *cert,
EVP_PKEY *pkey;
STACK_OF(X509) *chain;
x509 = ngx_ssl_load_certificate(cf->pool, &err, cert, &chain);
if (x509 == NULL) {
chain = ngx_ssl_cache_fetch(cf, NGX_SSL_CACHE_CERT, &err, cert, NULL);
if (chain == NULL) {
if (err != NULL) {
ngx_ssl_error(NGX_LOG_EMERG, ssl->log, 0,
"cannot load certificate \"%s\": %s",
@ -460,6 +458,8 @@ ngx_ssl_certificate(ngx_conf_t *cf, ngx_ssl_t *ssl, ngx_str_t *cert,
return NGX_ERROR;
}
x509 = sk_X509_shift(chain);
if (SSL_CTX_use_certificate(ssl->ctx, x509) == 0) {
ngx_ssl_error(NGX_LOG_EMERG, ssl->log, 0,
"SSL_CTX_use_certificate(\"%s\") failed", cert->data);
@ -570,8 +570,9 @@ ngx_ssl_connection_certificate(ngx_connection_t *c, ngx_pool_t *pool,
EVP_PKEY *pkey;
STACK_OF(X509) *chain;
x509 = ngx_ssl_load_certificate(pool, &err, cert, &chain);
if (x509 == NULL) {
chain = ngx_ssl_cache_connection_fetch(pool, NGX_SSL_CACHE_CERT, &err,
cert, NULL);
if (chain == NULL) {
if (err != NULL) {
ngx_ssl_error(NGX_LOG_ERR, c->log, 0,
"cannot load certificate \"%s\": %s",
@ -581,6 +582,8 @@ ngx_ssl_connection_certificate(ngx_connection_t *c, ngx_pool_t *pool,
return NGX_ERROR;
}
x509 = sk_X509_shift(chain);
if (SSL_use_certificate(c->ssl->connection, x509) == 0) {
ngx_ssl_error(NGX_LOG_ERR, c->log, 0,
"SSL_use_certificate(\"%s\") failed", cert->data);
@ -632,96 +635,6 @@ ngx_ssl_connection_certificate(ngx_connection_t *c, ngx_pool_t *pool,
}
static X509 *
ngx_ssl_load_certificate(ngx_pool_t *pool, char **err, ngx_str_t *cert,
STACK_OF(X509) **chain)
{
BIO *bio;
X509 *x509, *temp;
u_long n;
if (ngx_strncmp(cert->data, "data:", sizeof("data:") - 1) == 0) {
bio = BIO_new_mem_buf(cert->data + sizeof("data:") - 1,
cert->len - (sizeof("data:") - 1));
if (bio == NULL) {
*err = "BIO_new_mem_buf() failed";
return NULL;
}
} else {
if (ngx_get_full_name(pool, (ngx_str_t *) &ngx_cycle->conf_prefix, cert)
!= NGX_OK)
{
*err = NULL;
return NULL;
}
bio = BIO_new_file((char *) cert->data, "r");
if (bio == NULL) {
*err = "BIO_new_file() failed";
return NULL;
}
}
/* certificate itself */
x509 = PEM_read_bio_X509_AUX(bio, NULL, NULL, NULL);
if (x509 == NULL) {
*err = "PEM_read_bio_X509_AUX() failed";
BIO_free(bio);
return NULL;
}
/* rest of the chain */
*chain = sk_X509_new_null();
if (*chain == NULL) {
*err = "sk_X509_new_null() failed";
BIO_free(bio);
X509_free(x509);
return NULL;
}
for ( ;; ) {
temp = PEM_read_bio_X509(bio, NULL, NULL, NULL);
if (temp == NULL) {
n = ERR_peek_last_error();
if (ERR_GET_LIB(n) == ERR_LIB_PEM
&& ERR_GET_REASON(n) == PEM_R_NO_START_LINE)
{
/* end of file */
ERR_clear_error();
break;
}
/* some real error */
*err = "PEM_read_bio_X509() failed";
BIO_free(bio);
X509_free(x509);
sk_X509_pop_free(*chain, X509_free);
return NULL;
}
if (sk_X509_push(*chain, temp) == 0) {
*err = "sk_X509_push() failed";
BIO_free(bio);
X509_free(x509);
sk_X509_pop_free(*chain, X509_free);
return NULL;
}
}
BIO_free(bio);
return x509;
}
static EVP_PKEY *
ngx_ssl_load_certificate_key(ngx_pool_t *pool, char **err,
ngx_str_t *key, ngx_array_t *passwords)

3
src/event/ngx_event_openssl.h
View File

@ -193,6 +193,9 @@ typedef struct {
#define NGX_SSL_BUFSIZE 16384
#define NGX_SSL_CACHE_CERT 0
ngx_int_t ngx_ssl_init(ngx_log_t *log);
ngx_int_t ngx_ssl_create(ngx_ssl_t *ssl, ngx_uint_t protocols, void *data);

155
src/event/ngx_event_openssl_cache.c
View File

@ -10,6 +10,7 @@
#define NGX_SSL_CACHE_PATH 0
#define NGX_SSL_CACHE_DATA 1
typedef struct {
@ -51,6 +52,13 @@ static ngx_int_t ngx_ssl_cache_init_key(ngx_pool_t *pool, ngx_uint_t index,
static ngx_ssl_cache_node_t *ngx_ssl_cache_lookup(ngx_ssl_cache_t *cache,
ngx_ssl_cache_type_t *type, ngx_ssl_cache_key_t *id, uint32_t hash);
static void *ngx_ssl_cache_cert_create(ngx_ssl_cache_key_t *id, char **err,
void *data);
static void ngx_ssl_cache_cert_free(void *data);
static void *ngx_ssl_cache_cert_ref(char **err, void *data);
static BIO *ngx_ssl_cache_create_bio(ngx_ssl_cache_key_t *id, char **err);
static void *ngx_openssl_cache_create_conf(ngx_cycle_t *cycle);
static void ngx_ssl_cache_cleanup(void *data);
static void ngx_ssl_cache_node_insert(ngx_rbtree_node_t *temp,
@ -82,6 +90,10 @@ ngx_module_t ngx_openssl_cache_module = {
static ngx_ssl_cache_type_t ngx_ssl_cache_types[] = {
/* NGX_SSL_CACHE_CERT */
{ ngx_ssl_cache_cert_create,
ngx_ssl_cache_cert_free,
ngx_ssl_cache_cert_ref },
};
@ -152,6 +164,10 @@ static ngx_int_t
ngx_ssl_cache_init_key(ngx_pool_t *pool, ngx_uint_t index, ngx_str_t *path,
ngx_ssl_cache_key_t *id)
{
if (ngx_strncmp(path->data, "data:", sizeof("data:") - 1) == 0) {
id->type = NGX_SSL_CACHE_DATA;
} else {
if (ngx_get_full_name(pool, (ngx_str_t *) &ngx_cycle->conf_prefix, path)
!= NGX_OK)
{
@ -159,6 +175,7 @@ ngx_ssl_cache_init_key(ngx_pool_t *pool, ngx_uint_t index, ngx_str_t *path,
}
id->type = NGX_SSL_CACHE_PATH;
}
id->len = path->len;
id->data = path->data;
@ -219,6 +236,144 @@ ngx_ssl_cache_lookup(ngx_ssl_cache_t *cache, ngx_ssl_cache_type_t *type,
}
static void *
ngx_ssl_cache_cert_create(ngx_ssl_cache_key_t *id, char **err, void *data)
{
BIO *bio;
X509 *x509;
u_long n;
STACK_OF(X509) *chain;
chain = sk_X509_new_null();
if (chain == NULL) {
*err = "sk_X509_new_null() failed";
return NULL;
}
bio = ngx_ssl_cache_create_bio(id, err);
if (bio == NULL) {
sk_X509_pop_free(chain, X509_free);
return NULL;
}
/* certificate itself */
x509 = PEM_read_bio_X509_AUX(bio, NULL, NULL, NULL);
if (x509 == NULL) {
*err = "PEM_read_bio_X509_AUX() failed";
BIO_free(bio);
sk_X509_pop_free(chain, X509_free);
return NULL;
}
if (sk_X509_push(chain, x509) == 0) {
*err = "sk_X509_push() failed";
BIO_free(bio);
X509_free(x509);
sk_X509_pop_free(chain, X509_free);
return NULL;
}
/* rest of the chain */
for ( ;; ) {
x509 = PEM_read_bio_X509(bio, NULL, NULL, NULL);
if (x509 == NULL) {
n = ERR_peek_last_error();
if (ERR_GET_LIB(n) == ERR_LIB_PEM
&& ERR_GET_REASON(n) == PEM_R_NO_START_LINE)
{
/* end of file */
ERR_clear_error();
break;
}
/* some real error */
*err = "PEM_read_bio_X509() failed";
BIO_free(bio);
sk_X509_pop_free(chain, X509_free);
return NULL;
}
if (sk_X509_push(chain, x509) == 0) {
*err = "sk_X509_push() failed";
BIO_free(bio);
X509_free(x509);
sk_X509_pop_free(chain, X509_free);
return NULL;
}
}
BIO_free(bio);
return chain;
}
static void
ngx_ssl_cache_cert_free(void *data)
{
sk_X509_pop_free(data, X509_free);
}
static void *
ngx_ssl_cache_cert_ref(char **err, void *data)
{
int n, i;
X509 *x509;
STACK_OF(X509) *chain;
chain = sk_X509_dup(data);
if (chain == NULL) {
*err = "sk_X509_dup() failed";
return NULL;
}
n = sk_X509_num(chain);
for (i = 0; i < n; i++) {
x509 = sk_X509_value(chain, i);
#if (OPENSSL_VERSION_NUMBER >= 0x10100000L)
X509_up_ref(x509);
#else
CRYPTO_add(&x509->references, 1, CRYPTO_LOCK_X509);
#endif
}
return chain;
}
static BIO *
ngx_ssl_cache_create_bio(ngx_ssl_cache_key_t *id, char **err)
{
BIO *bio;
if (id->type == NGX_SSL_CACHE_DATA) {
bio = BIO_new_mem_buf(id->data + sizeof("data:") - 1,
id->len - (sizeof("data:") - 1));
if (bio == NULL) {
*err = "BIO_new_mem_buf() failed";
}
return bio;
}
bio = BIO_new_file((char *) id->data, "r");
if (bio == NULL) {
*err = "BIO_new_file() failed";
}
return bio;
}
static void *
ngx_openssl_cache_create_conf(ngx_cycle_t *cycle)
{