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nginx / nginx / 75c3272a1caf96c3a0e9e1384e5219755588cc0c / . / src / event / ngx_event_openssl.c
blob: 5bd3b6a16bd22f92c396b8aae4426d54255d828c [file] [log] [blame]
/*
* Copyright (C) Igor Sysoev
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_event.h>
typedef struct {
ngx_str_t engine;
} ngx_openssl_conf_t;
static int ngx_http_ssl_verify_callback(int ok, X509_STORE_CTX *x509_store);
static void ngx_ssl_handshake_handler(ngx_event_t *ev);
static ngx_int_t ngx_ssl_handle_recv(ngx_connection_t *c, int n);
static void ngx_ssl_write_handler(ngx_event_t *wev);
static void ngx_ssl_read_handler(ngx_event_t *rev);
static void ngx_ssl_shutdown_handler(ngx_event_t *ev);
static void ngx_ssl_connection_error(ngx_connection_t *c, int sslerr,
ngx_err_t err, char *text);
static ngx_int_t ngx_ssl_session_cache_init(ngx_shm_zone_t *shm_zone,
void *data);
static int ngx_ssl_new_session(ngx_ssl_conn_t *ssl_conn,
ngx_ssl_session_t *sess);
static ngx_ssl_session_t *ngx_ssl_get_cached_session(ngx_ssl_conn_t *ssl_conn,
u_char *id, int len, int *copy);
static void ngx_ssl_remove_session(SSL_CTX *ssl, ngx_ssl_session_t *sess);
static void ngx_ssl_expire_sessions(ngx_ssl_session_cache_t *cache,
ngx_slab_pool_t *shpool, ngx_uint_t n);
static void ngx_ssl_session_rbtree_insert_value(ngx_rbtree_node_t *temp,
ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel);
static void *ngx_openssl_create_conf(ngx_cycle_t *cycle);
static char *ngx_openssl_init_conf(ngx_cycle_t *cycle, void *conf);
static void ngx_openssl_exit(ngx_cycle_t *cycle);
#if !(NGX_SSL_ENGINE)
static char *ngx_openssl_noengine(ngx_conf_t *cf, ngx_command_t *cmd,
void *conf);
#endif
static ngx_command_t ngx_openssl_commands[] = {
{ ngx_string("ssl_engine"),
NGX_MAIN_CONF|NGX_DIRECT_CONF|NGX_CONF_TAKE1,
#if (NGX_SSL_ENGINE)
ngx_conf_set_str_slot,
#else
ngx_openssl_noengine,
#endif
0,
offsetof(ngx_openssl_conf_t, engine),
NULL },
ngx_null_command
};
static ngx_core_module_t ngx_openssl_module_ctx = {
ngx_string("openssl"),
ngx_openssl_create_conf,
ngx_openssl_init_conf
};
ngx_module_t ngx_openssl_module = {
NGX_MODULE_V1,
&ngx_openssl_module_ctx, /* module context */
ngx_openssl_commands, /* module directives */
NGX_CORE_MODULE, /* module type */
NULL, /* init master */
NULL, /* init module */
NULL, /* init process */
NULL, /* init thread */
NULL, /* exit thread */
NULL, /* exit process */
ngx_openssl_exit, /* exit master */
NGX_MODULE_V1_PADDING
};
static long ngx_ssl_protocols[] = {
SSL_OP_NO_SSLv2|SSL_OP_NO_SSLv3|SSL_OP_NO_TLSv1,
SSL_OP_NO_SSLv3|SSL_OP_NO_TLSv1,
SSL_OP_NO_SSLv2|SSL_OP_NO_TLSv1,
SSL_OP_NO_TLSv1,
SSL_OP_NO_SSLv2|SSL_OP_NO_SSLv3,
SSL_OP_NO_SSLv3,
SSL_OP_NO_SSLv2,
0,
};
int ngx_ssl_connection_index;
int ngx_ssl_server_conf_index;
int ngx_ssl_session_cache_index;
ngx_int_t
ngx_ssl_init(ngx_log_t *log)
{
#if OPENSSL_VERSION_NUMBER >= 0x00907000
OPENSSL_config(NULL);
#endif
SSL_library_init();
SSL_load_error_strings();
#if (NGX_SSL_ENGINE)
ENGINE_load_builtin_engines();
#endif
ngx_ssl_connection_index = SSL_get_ex_new_index(0, NULL, NULL, NULL, NULL);
if (ngx_ssl_connection_index == -1) {
ngx_ssl_error(NGX_LOG_ALERT, log, 0, "SSL_get_ex_new_index() failed");
return NGX_ERROR;
}
ngx_ssl_server_conf_index = SSL_CTX_get_ex_new_index(0, NULL, NULL, NULL,
NULL);
if (ngx_ssl_server_conf_index == -1) {
ngx_ssl_error(NGX_LOG_ALERT, log, 0,
"SSL_CTX_get_ex_new_index() failed");
return NGX_ERROR;
}
ngx_ssl_session_cache_index = SSL_CTX_get_ex_new_index(0, NULL, NULL, NULL,
NULL);
if (ngx_ssl_session_cache_index == -1) {
ngx_ssl_error(NGX_LOG_ALERT, log, 0,
"SSL_CTX_get_ex_new_index() failed");
return NGX_ERROR;
}
return NGX_OK;
}
ngx_int_t
ngx_ssl_create(ngx_ssl_t *ssl, ngx_uint_t protocols, void *data)
{
ssl->ctx = SSL_CTX_new(SSLv23_method());
if (ssl->ctx == NULL) {
ngx_ssl_error(NGX_LOG_EMERG, ssl->log, 0, "SSL_CTX_new() failed");
return NGX_ERROR;
}
if (SSL_CTX_set_ex_data(ssl->ctx, ngx_ssl_server_conf_index, data) == 0) {
ngx_ssl_error(NGX_LOG_EMERG, ssl->log, 0,
"SSL_CTX_set_ex_data() failed");
return NGX_ERROR;
}
/* client side options */
SSL_CTX_set_options(ssl->ctx, SSL_OP_MICROSOFT_SESS_ID_BUG);
SSL_CTX_set_options(ssl->ctx, SSL_OP_NETSCAPE_CHALLENGE_BUG);
SSL_CTX_set_options(ssl->ctx, SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG);
/* server side options */
SSL_CTX_set_options(ssl->ctx, SSL_OP_SSLREF2_REUSE_CERT_TYPE_BUG);
SSL_CTX_set_options(ssl->ctx, SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER);
/* this option allow a potential SSL 2.0 rollback (CAN-2005-2969) */
SSL_CTX_set_options(ssl->ctx, SSL_OP_MSIE_SSLV2_RSA_PADDING);
SSL_CTX_set_options(ssl->ctx, SSL_OP_SSLEAY_080_CLIENT_DH_BUG);
SSL_CTX_set_options(ssl->ctx, SSL_OP_TLS_D5_BUG);
SSL_CTX_set_options(ssl->ctx, SSL_OP_TLS_BLOCK_PADDING_BUG);
#ifdef SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS
SSL_CTX_set_options(ssl->ctx, SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS);
#endif
if (ngx_ssl_protocols[protocols >> 1] != 0) {
SSL_CTX_set_options(ssl->ctx, ngx_ssl_protocols[protocols >> 1]);
}
SSL_CTX_set_mode(ssl->ctx, SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER);
SSL_CTX_set_read_ahead(ssl->ctx, 1);
return NGX_OK;
}
ngx_int_t
ngx_ssl_certificate(ngx_conf_t *cf, ngx_ssl_t *ssl, ngx_str_t *cert,
ngx_str_t *key)
{
if (ngx_conf_full_name(cf->cycle, cert) == NGX_ERROR) {
return NGX_ERROR;
}
if (SSL_CTX_use_certificate_chain_file(ssl->ctx, (char *) cert->data)
== 0)
{
ngx_ssl_error(NGX_LOG_EMERG, ssl->log, 0,
"SSL_CTX_use_certificate_chain_file(\"%s\") failed",
cert->data);
return NGX_ERROR;
}
if (ngx_conf_full_name(cf->cycle, key) == NGX_ERROR) {
return NGX_ERROR;
}
if (SSL_CTX_use_PrivateKey_file(ssl->ctx, (char *) key->data,
SSL_FILETYPE_PEM)
== 0)
{
ngx_ssl_error(NGX_LOG_EMERG, ssl->log, 0,
"SSL_CTX_use_PrivateKey_file(\"%s\") failed", key->data);
return NGX_ERROR;
}
return NGX_OK;
}
ngx_int_t
ngx_ssl_client_certificate(ngx_conf_t *cf, ngx_ssl_t *ssl, ngx_str_t *cert,
ngx_int_t depth)
{
STACK_OF(X509_NAME) *list;
SSL_CTX_set_verify(ssl->ctx, SSL_VERIFY_PEER, ngx_http_ssl_verify_callback);
SSL_CTX_set_verify_depth(ssl->ctx, depth);
if (cert->len == 0) {
return NGX_OK;
}
if (ngx_conf_full_name(cf->cycle, cert) == NGX_ERROR) {
return NGX_ERROR;
}
if (SSL_CTX_load_verify_locations(ssl->ctx, (char *) cert->data, NULL)
== 0)
{
ngx_ssl_error(NGX_LOG_EMERG, ssl->log, 0,
"SSL_CTX_load_verify_locations(\"%s\") failed",
cert->data);
return NGX_ERROR;
}
list = SSL_load_client_CA_file((char *) cert->data);
if (list == NULL) {
ngx_ssl_error(NGX_LOG_EMERG, ssl->log, 0,
"SSL_load_client_CA_file(\"%s\") failed", cert->data);
return NGX_ERROR;
}
/*
* before 0.9.7h and 0.9.8 SSL_load_client_CA_file()
* always leaved an error in the error queue
*/
ERR_clear_error();
SSL_CTX_set_client_CA_list(ssl->ctx, list);
return NGX_OK;
}
static int
ngx_http_ssl_verify_callback(int ok, X509_STORE_CTX *x509_store)
{
char *subject, *issuer;
int err, depth;
X509 *cert;
X509_NAME *name;
ngx_connection_t *c;
ngx_ssl_conn_t *ssl_conn;
ssl_conn = X509_STORE_CTX_get_ex_data(x509_store,
SSL_get_ex_data_X509_STORE_CTX_idx());
c = ngx_ssl_get_connection(ssl_conn);
cert = X509_STORE_CTX_get_current_cert(x509_store);
err = X509_STORE_CTX_get_error(x509_store);
depth = X509_STORE_CTX_get_error_depth(x509_store);
name = X509_get_subject_name(cert);
subject = name ? X509_NAME_oneline(name, NULL, 0) : "(none)";
name = X509_get_issuer_name(cert);
issuer = name ? X509_NAME_oneline(name, NULL, 0) : "(none)";
ngx_log_debug5(NGX_LOG_DEBUG_EVENT, c->log, 0,
"verify:%d, error:%d, depth:%d, "
"subject:\"%s\",issuer: \"%s\"",
ok, err, depth, subject, issuer);
return 1;
}
ngx_int_t
ngx_ssl_generate_rsa512_key(ngx_ssl_t *ssl)
{
RSA *key;
if (SSL_CTX_need_tmp_RSA(ssl->ctx) == 0) {
return NGX_OK;
}
key = RSA_generate_key(512, RSA_F4, NULL, NULL);
if (key) {
SSL_CTX_set_tmp_rsa(ssl->ctx, key);
RSA_free(key);
return NGX_OK;
}
ngx_ssl_error(NGX_LOG_EMERG, ssl->log, 0, "RSA_generate_key(512) failed");
return NGX_ERROR;
}
ngx_int_t
ngx_ssl_create_connection(ngx_ssl_t *ssl, ngx_connection_t *c, ngx_uint_t flags)
{
ngx_ssl_connection_t *sc;
sc = ngx_pcalloc(c->pool, sizeof(ngx_ssl_connection_t));
if (sc == NULL) {
return NGX_ERROR;
}
if (flags & NGX_SSL_BUFFER) {
sc->buffer = 1;
sc->buf = ngx_create_temp_buf(c->pool, NGX_SSL_BUFSIZE);
if (sc->buf == NULL) {
return NGX_ERROR;
}
}
sc->connection = SSL_new(ssl->ctx);
if (sc->connection == NULL) {
ngx_ssl_error(NGX_LOG_ALERT, c->log, 0, "SSL_new() failed");
return NGX_ERROR;
}
if (SSL_set_fd(sc->connection, c->fd) == 0) {
ngx_ssl_error(NGX_LOG_ALERT, c->log, 0, "SSL_set_fd() failed");
return NGX_ERROR;
}
if (flags & NGX_SSL_CLIENT) {
SSL_set_connect_state(sc->connection);
} else {
SSL_set_accept_state(sc->connection);
}
if (SSL_set_ex_data(sc->connection, ngx_ssl_connection_index, c) == 0) {
ngx_ssl_error(NGX_LOG_ALERT, c->log, 0, "SSL_set_ex_data() failed");
return NGX_ERROR;
}
c->ssl = sc;
return NGX_OK;
}
ngx_int_t
ngx_ssl_set_session(ngx_connection_t *c, ngx_ssl_session_t *session)
{
if (session) {
if (SSL_set_session(c->ssl->connection, session) == 0) {
ngx_ssl_error(NGX_LOG_ALERT, c->log, 0, "SSL_set_session() failed");
return NGX_ERROR;
}
}
return NGX_OK;
}
ngx_int_t
ngx_ssl_handshake(ngx_connection_t *c)
{
int n, sslerr;
ngx_err_t err;
n = SSL_do_handshake(c->ssl->connection);
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "SSL_do_handshake: %d", n);
if (n == 1) {
if (ngx_handle_read_event(c->read, 0) == NGX_ERROR) {
return NGX_ERROR;
}
if (ngx_handle_write_event(c->write, 0) == NGX_ERROR) {
return NGX_ERROR;
}
#if (NGX_DEBUG)
{
char buf[129], *s, *d;
SSL_CIPHER *cipher;
cipher = SSL_get_current_cipher(c->ssl->connection);
if (cipher) {
SSL_CIPHER_description(cipher, &buf[1], 128);
for (s = &buf[1], d = buf; *s; s++) {
if (*s == ' ' && *d == ' ') {
continue;
}
if (*s == LF || *s == CR) {
continue;
}
*++d = *s;
}
if (*d != ' ') {
d++;
}
*d = '\0';
ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
"SSL: %s, cipher: \"%s\"",
SSL_get_version(c->ssl->connection), &buf[1]);
if (SSL_session_reused(c->ssl->connection)) {
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, 0,
"SSL reused session");
}
} else {
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, 0,
"SSL no shared ciphers");
}
}
#endif
c->ssl->handshaked = 1;
c->recv = ngx_ssl_recv;
c->send = ngx_ssl_write;
c->recv_chain = ngx_ssl_recv_chain;
c->send_chain = ngx_ssl_send_chain;
return NGX_OK;
}
sslerr = SSL_get_error(c->ssl->connection, n);
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "SSL_get_error: %d", sslerr);
if (sslerr == SSL_ERROR_WANT_READ) {
c->read->ready = 0;
c->read->handler = ngx_ssl_handshake_handler;
c->write->handler = ngx_ssl_handshake_handler;
if (ngx_handle_read_event(c->read, 0) == NGX_ERROR) {
return NGX_ERROR;
}
return NGX_AGAIN;
}
if (sslerr == SSL_ERROR_WANT_WRITE) {
c->write->ready = 0;
c->read->handler = ngx_ssl_handshake_handler;
c->write->handler = ngx_ssl_handshake_handler;
if (ngx_handle_write_event(c->write, 0) == NGX_ERROR) {
return NGX_ERROR;
}
return NGX_AGAIN;
}
err = (sslerr == SSL_ERROR_SYSCALL) ? ngx_errno : 0;
c->ssl->no_wait_shutdown = 1;
c->ssl->no_send_shutdown = 1;
c->read->eof = 1;
if (sslerr == SSL_ERROR_ZERO_RETURN || ERR_peek_error() == 0) {
ngx_log_error(NGX_LOG_INFO, c->log, err,
"peer closed connection in SSL handshake");
return NGX_ERROR;
}
c->read->error = 1;
ngx_ssl_connection_error(c, sslerr, err, "SSL_do_handshake() failed");
return NGX_ERROR;
}
static void
ngx_ssl_handshake_handler(ngx_event_t *ev)
{
ngx_connection_t *c;
c = ev->data;
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
"SSL handshake handler: %d", ev->write);
if (ev->timedout) {
c->ssl->handler(c);
return;
}
if (ngx_ssl_handshake(c) == NGX_AGAIN) {
return;
}
c->ssl->handler(c);
}
ssize_t
ngx_ssl_recv_chain(ngx_connection_t *c, ngx_chain_t *cl)
{
u_char *last;
ssize_t n, bytes;
ngx_buf_t *b;
bytes = 0;
b = cl->buf;
last = b->last;
for ( ;; ) {
n = ngx_ssl_recv(c, last, b->end - last);
if (n > 0) {
last += n;
bytes += n;
if (last == b->end) {
cl = cl->next;
if (cl == NULL) {
return bytes;
}
b = cl->buf;
last = b->last;
}
continue;
}
if (bytes) {
return bytes;
}
return n;
}
}
ssize_t
ngx_ssl_recv(ngx_connection_t *c, u_char *buf, size_t size)
{
int n, bytes;
if (c->ssl->last == NGX_ERROR) {
return NGX_ERROR;
}
if (c->ssl->last == NGX_DONE) {
return 0;
}
bytes = 0;
/*
* SSL_read() may return data in parts, so try to read
* until SSL_read() would return no data
*/
for ( ;; ) {
n = SSL_read(c->ssl->connection, buf, size);
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "SSL_read: %d", n);
if (n > 0) {
bytes += n;
}
c->ssl->last = ngx_ssl_handle_recv(c, n);
if (c->ssl->last != NGX_OK) {
if (bytes) {
return bytes;
}
if (c->ssl->last == NGX_DONE) {
return 0;
}
return c->ssl->last;
}
size -= n;
if (size == 0) {
return bytes;
}
buf += n;
}
}
static ngx_int_t
ngx_ssl_handle_recv(ngx_connection_t *c, int n)
{
int sslerr;
ngx_err_t err;
if (n > 0) {
if (c->ssl->saved_write_handler) {
c->write->handler = c->ssl->saved_write_handler;
c->ssl->saved_write_handler = NULL;
c->write->ready = 1;
if (ngx_handle_write_event(c->write, 0) == NGX_ERROR) {
return NGX_ERROR;
}
ngx_post_event(c->write, &ngx_posted_events);
}
return NGX_OK;
}
sslerr = SSL_get_error(c->ssl->connection, n);
err = (sslerr == SSL_ERROR_SYSCALL) ? ngx_errno : 0;
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "SSL_get_error: %d", sslerr);
if (sslerr == SSL_ERROR_WANT_READ) {
c->read->ready = 0;
return NGX_AGAIN;
}
if (sslerr == SSL_ERROR_WANT_WRITE) {
ngx_log_error(NGX_LOG_INFO, c->log, 0,
"peer started SSL renegotiation");
c->write->ready = 0;
if (ngx_handle_write_event(c->write, 0) == NGX_ERROR) {
return NGX_ERROR;
}
/*
* we do not set the timer because there is already the read event timer
*/
if (c->ssl->saved_write_handler == NULL) {
c->ssl->saved_write_handler = c->write->handler;
c->write->handler = ngx_ssl_write_handler;
}
return NGX_AGAIN;
}
c->ssl->no_wait_shutdown = 1;
c->ssl->no_send_shutdown = 1;
c->read->eof = 1;
if (sslerr == SSL_ERROR_ZERO_RETURN || ERR_peek_error() == 0) {
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, 0,
"peer shutdown SSL cleanly");
return NGX_DONE;
}
c->read->error = 1;
ngx_ssl_connection_error(c, sslerr, err, "SSL_read() failed");
return NGX_ERROR;
}
static void
ngx_ssl_write_handler(ngx_event_t *wev)
{
ngx_connection_t *c;
c = wev->data;
c->read->handler(c->read);
}
/*
* OpenSSL has no SSL_writev() so we copy several bufs into our 16K buffer
* before the SSL_write() call to decrease a SSL overhead.
*
* Besides for protocols such as HTTP it is possible to always buffer
* the output to decrease a SSL overhead some more.
*/
ngx_chain_t *
ngx_ssl_send_chain(ngx_connection_t *c, ngx_chain_t *in, off_t limit)
{
int n;
ngx_uint_t flush;
ssize_t send, size;
ngx_buf_t *buf;
if (!c->ssl->buffer
|| (in && in->next == NULL && !(c->buffered & NGX_SSL_BUFFERED)))
{
/*
* we avoid a buffer copy if
* we do not need to buffer the output
* or the incoming buf is a single and our buffer is empty
*/
while (in) {
if (ngx_buf_special(in->buf)) {
in = in->next;
continue;
}
n = ngx_ssl_write(c, in->buf->pos, in->buf->last - in->buf->pos);
if (n == NGX_ERROR) {
return NGX_CHAIN_ERROR;
}
if (n == NGX_AGAIN) {
c->buffered |= NGX_SSL_BUFFERED;
return in;
}
in->buf->pos += n;
if (in->buf->pos == in->buf->last) {
in = in->next;
}
}
return in;
}
/* the maximum limit size is the maximum uint32_t value - the page size */
if (limit == 0 || limit > NGX_MAX_UINT32_VALUE - ngx_pagesize) {
limit = NGX_MAX_UINT32_VALUE - ngx_pagesize;
}
buf = c->ssl->buf;
send = 0;
flush = (in == NULL) ? 1 : 0;
for ( ;; ) {
while (in && buf->last < buf->end) {
if (in->buf->last_buf || in->buf->flush) {
flush = 1;
}
if (ngx_buf_special(in->buf)) {
in = in->next;
continue;
}
size = in->buf->last - in->buf->pos;
if (size > buf->end - buf->last) {
size = buf->end - buf->last;
}
if (send + size > limit) {
size = (ssize_t) (limit - send);
flush = 1;
}
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
"SSL buf copy: %d", size);
ngx_memcpy(buf->last, in->buf->pos, size);
buf->last += size;
in->buf->pos += size;
if (in->buf->pos == in->buf->last) {
in = in->next;
}
}
size = buf->last - buf->pos;
if (!flush && buf->last < buf->end && c->ssl->buffer) {
break;
}
n = ngx_ssl_write(c, buf->pos, size);
if (n == NGX_ERROR) {
return NGX_CHAIN_ERROR;
}
if (n == NGX_AGAIN) {
c->buffered |= NGX_SSL_BUFFERED;
return in;
}
buf->pos += n;
send += n;
c->sent += n;
if (n < size) {
break;
}
if (buf->pos == buf->last) {
buf->pos = buf->start;
buf->last = buf->start;
}
if (in == NULL || send == limit) {
break;
}
}
if (buf->pos < buf->last) {
c->buffered |= NGX_SSL_BUFFERED;
} else {
c->buffered &= ~NGX_SSL_BUFFERED;
}
return in;
}
ssize_t
ngx_ssl_write(ngx_connection_t *c, u_char *data, size_t size)
{
int n, sslerr;
ngx_err_t err;
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "SSL to write: %d", size);
n = SSL_write(c->ssl->connection, data, size);
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "SSL_write: %d", n);
if (n > 0) {
if (c->ssl->saved_read_handler) {
c->read->handler = c->ssl->saved_read_handler;
c->ssl->saved_read_handler = NULL;
c->read->ready = 1;
if (ngx_handle_read_event(c->read, 0) == NGX_ERROR) {
return NGX_ERROR;
}
ngx_post_event(c->read, &ngx_posted_events);
}
return n;
}
sslerr = SSL_get_error(c->ssl->connection, n);
err = (sslerr == SSL_ERROR_SYSCALL) ? ngx_errno : 0;
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "SSL_get_error: %d", sslerr);
if (sslerr == SSL_ERROR_WANT_WRITE) {
c->write->ready = 0;
return NGX_AGAIN;
}
if (sslerr == SSL_ERROR_WANT_READ) {
ngx_log_error(NGX_LOG_INFO, c->log, 0,
"peer started SSL renegotiation");
c->read->ready = 0;
if (ngx_handle_read_event(c->read, 0) == NGX_ERROR) {
return NGX_ERROR;
}
/*
* we do not set the timer because there is already
* the write event timer
*/
if (c->ssl->saved_read_handler == NULL) {
c->ssl->saved_read_handler = c->read->handler;
c->read->handler = ngx_ssl_read_handler;
}
return NGX_AGAIN;
}
c->ssl->no_wait_shutdown = 1;
c->ssl->no_send_shutdown = 1;
c->write->error = 1;
ngx_ssl_connection_error(c, sslerr, err, "SSL_write() failed");
return NGX_ERROR;
}
static void
ngx_ssl_read_handler(ngx_event_t *rev)
{
ngx_connection_t *c;
c = rev->data;
c->write->handler(c->write);
}
ngx_int_t
ngx_ssl_shutdown(ngx_connection_t *c)
{
int n, sslerr, mode;
ngx_err_t err;
ngx_uint_t again;
if (c->timedout) {
mode = SSL_RECEIVED_SHUTDOWN|SSL_SENT_SHUTDOWN;
} else {
mode = SSL_get_shutdown(c->ssl->connection);
if (c->ssl->no_wait_shutdown) {
mode |= SSL_RECEIVED_SHUTDOWN;
}
if (c->ssl->no_send_shutdown) {
mode |= SSL_SENT_SHUTDOWN;
}
}
SSL_set_shutdown(c->ssl->connection, mode);
again = 0;
sslerr = 0;
for ( ;; ) {
n = SSL_shutdown(c->ssl->connection);
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "SSL_shutdown: %d", n);
if (n == 1 || (n == 0 && c->timedout)) {
SSL_free(c->ssl->connection);
c->ssl = NULL;
return NGX_OK;
}
if (n == 0) {
again = 1;
break;
}
break;
}
if (!again) {
sslerr = SSL_get_error(c->ssl->connection, n);
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
"SSL_get_error: %d", sslerr);
}
if (again
|| sslerr == SSL_ERROR_WANT_READ
|| sslerr == SSL_ERROR_WANT_WRITE)
{
c->read->handler = ngx_ssl_shutdown_handler;
c->write->handler = ngx_ssl_shutdown_handler;
if (ngx_handle_read_event(c->read, 0) == NGX_ERROR) {
return NGX_ERROR;
}
if (ngx_handle_write_event(c->write, 0) == NGX_ERROR) {
return NGX_ERROR;
}
if (again || sslerr == SSL_ERROR_WANT_READ) {
ngx_add_timer(c->read, 30000);
}
return NGX_AGAIN;
}
err = (sslerr == SSL_ERROR_SYSCALL) ? ngx_errno : 0;
ngx_ssl_connection_error(c, sslerr, err, "SSL_shutdown() failed");
SSL_free(c->ssl->connection);
c->ssl = NULL;
return NGX_ERROR;
}
static void
ngx_ssl_shutdown_handler(ngx_event_t *ev)
{
ngx_connection_t *c;
ngx_connection_handler_pt handler;
c = ev->data;
handler = c->ssl->handler;
if (ev->timedout) {
c->timedout = 1;
}
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, ev->log, 0, "SSL shutdown handler");
if (ngx_ssl_shutdown(c) == NGX_AGAIN) {
return;
}
handler(c);
}
static void
ngx_ssl_connection_error(ngx_connection_t *c, int sslerr, ngx_err_t err,
char *text)
{
ngx_uint_t level;
level = NGX_LOG_CRIT;
if (sslerr == SSL_ERROR_SYSCALL) {
if (err == NGX_ECONNRESET
|| err == NGX_EPIPE
|| err == NGX_ENOTCONN
#if !(NGX_CRIT_ETIMEDOUT)
|| err == NGX_ETIMEDOUT
#endif
|| err == NGX_ECONNREFUSED
|| err == NGX_EHOSTUNREACH)
{
switch (c->log_error) {
case NGX_ERROR_IGNORE_ECONNRESET:
case NGX_ERROR_INFO:
level = NGX_LOG_INFO;
break;
case NGX_ERROR_ERR:
level = NGX_LOG_ERR;
break;
default:
break;
}
}
}
ngx_ssl_error(level, c->log, err, text);
}
void ngx_cdecl
ngx_ssl_error(ngx_uint_t level, ngx_log_t *log, ngx_err_t err, char *fmt, ...)
{
u_long n;
va_list args;
u_char errstr[NGX_MAX_CONF_ERRSTR], *p, *last;
last = errstr + NGX_MAX_CONF_ERRSTR;
va_start(args, fmt);
p = ngx_vsnprintf(errstr, sizeof(errstr) - 1, fmt, args);
va_end(args);
p = ngx_cpystrn(p, (u_char *) " (SSL:", last - p);
while (p < last) {
n = ERR_get_error();
if (n == 0) {
break;
}
*p++ = ' ';
ERR_error_string_n(n, (char *) p, last - p);
while (p < last && *p) {
p++;
}
}
ngx_log_error(level, log, err, "%s)", errstr);
}
ngx_int_t
ngx_ssl_session_cache(ngx_ssl_t *ssl, ngx_str_t *sess_ctx,
ssize_t builtin_session_cache, ngx_shm_zone_t *shm_zone, time_t timeout)
{
long cache_mode;
cache_mode = SSL_SESS_CACHE_SERVER;
if (shm_zone && builtin_session_cache == NGX_SSL_NO_BUILTIN_SCACHE) {
cache_mode |= SSL_SESS_CACHE_NO_INTERNAL;
}
SSL_CTX_set_session_cache_mode(ssl->ctx, cache_mode);
SSL_CTX_set_session_id_context(ssl->ctx, sess_ctx->data, sess_ctx->len);
if (builtin_session_cache != NGX_SSL_NO_BUILTIN_SCACHE) {
if (builtin_session_cache != NGX_SSL_DFLT_BUILTIN_SCACHE) {
SSL_CTX_sess_set_cache_size(ssl->ctx, builtin_session_cache);
}
}
SSL_CTX_set_timeout(ssl->ctx, timeout);
if (shm_zone) {
shm_zone->init = ngx_ssl_session_cache_init;
SSL_CTX_sess_set_new_cb(ssl->ctx, ngx_ssl_new_session);
SSL_CTX_sess_set_get_cb(ssl->ctx, ngx_ssl_get_cached_session);
SSL_CTX_sess_set_remove_cb(ssl->ctx, ngx_ssl_remove_session);
if (SSL_CTX_set_ex_data(ssl->ctx, ngx_ssl_session_cache_index, shm_zone)
== 0)
{
ngx_ssl_error(NGX_LOG_EMERG, ssl->log, 0,
"SSL_CTX_set_ex_data() failed");
return NGX_ERROR;
}
}
return NGX_OK;
}
static ngx_int_t
ngx_ssl_session_cache_init(ngx_shm_zone_t *shm_zone, void *data)
{
ngx_slab_pool_t *shpool;
ngx_rbtree_node_t *sentinel;
ngx_ssl_session_cache_t *cache;
if (data) {
shm_zone->data = data;
return NGX_OK;
}
shpool = (ngx_slab_pool_t *) shm_zone->shm.addr;
cache = ngx_slab_alloc(shpool, sizeof(ngx_ssl_session_cache_t));
if (cache == NULL) {
return NGX_ERROR;
}
cache->session_cache_head.prev = NULL;
cache->session_cache_head.next = &cache->session_cache_tail;
cache->session_cache_tail.prev = &cache->session_cache_head;
cache->session_cache_tail.next = NULL;
cache->session_rbtree = ngx_slab_alloc(shpool, sizeof(ngx_rbtree_t));
if (cache->session_rbtree == NULL) {
return NGX_ERROR;
}
sentinel = ngx_slab_alloc(shpool, sizeof(ngx_rbtree_node_t));
if (sentinel == NULL) {
return NGX_ERROR;
}
ngx_rbtree_sentinel_init(sentinel);
cache->session_rbtree->root = sentinel;
cache->session_rbtree->sentinel = sentinel;
cache->session_rbtree->insert = ngx_ssl_session_rbtree_insert_value;
shm_zone->data = cache;
return NGX_OK;
}
/*
* The length of the session id is 16 bytes for SSLv2 sessions and
* between 1 and 32 bytes for SSLv3/TLSv1, typically 32 bytes.
* It seems that the typical length of the external ASN1 representation
* of a session is 118 or 119 bytes for SSLv3/TSLv1.
*
* Thus on 32-bit platforms we allocate separately an rbtree node,
* a session id, and an ASN1 representation, they take accordingly
* 64, 32, and 128 bytes.
*
* On 64-bit platforms we allocate separately an rbtree node + session_id,
* and an ASN1 representation, they take accordingly 128 and 128 bytes.
*
* OpenSSL's i2d_SSL_SESSION() and d2i_SSL_SESSION are slow,
* so they are outside the code locked by shared pool mutex
*/
static int
ngx_ssl_new_session(ngx_ssl_conn_t *ssl_conn, ngx_ssl_session_t *sess)
{
int len;
u_char *p, *id, *cached_sess;
uint32_t hash;
SSL_CTX *ssl_ctx;
ngx_time_t *tp;
ngx_shm_zone_t *shm_zone;
ngx_connection_t *c;
ngx_slab_pool_t *shpool;
ngx_ssl_sess_id_t *sess_id;
ngx_ssl_session_cache_t *cache;
u_char buf[NGX_SSL_MAX_SESSION_SIZE];
len = i2d_SSL_SESSION(sess, NULL);
/* do not cache too big session */
if (len > (int) NGX_SSL_MAX_SESSION_SIZE) {
return 0;
}
p = buf;
i2d_SSL_SESSION(sess, &p);
c = ngx_ssl_get_connection(ssl_conn);
ssl_ctx = SSL_get_SSL_CTX(ssl_conn);
shm_zone = SSL_CTX_get_ex_data(ssl_ctx, ngx_ssl_session_cache_index);
cache = shm_zone->data;
shpool = (ngx_slab_pool_t *) shm_zone->shm.addr;
ngx_shmtx_lock(&shpool->mutex);
/* drop one or two expired sessions */
ngx_ssl_expire_sessions(cache, shpool, 1);
cached_sess = ngx_slab_alloc_locked(shpool, len);
if (cached_sess == NULL) {
/* drop the oldest non-expired session and try once more */
ngx_ssl_expire_sessions(cache, shpool, 0);
cached_sess = ngx_slab_alloc_locked(shpool, len);
if (cached_sess == NULL) {
sess_id = NULL;
goto failed;
}
}
sess_id = ngx_slab_alloc_locked(shpool, sizeof(ngx_ssl_sess_id_t));
if (sess_id == NULL) {
goto failed;
}
#if (NGX_PTR_SIZE == 8)
id = sess_id->sess_id;
#else
id = ngx_slab_alloc_locked(shpool, sess->session_id_length);
if (id == NULL) {
goto failed;
}
#endif
ngx_memcpy(cached_sess, buf, len);
ngx_memcpy(id, sess->session_id, sess->session_id_length);
hash = ngx_crc32_short(sess->session_id, sess->session_id_length);
ngx_log_debug3(NGX_LOG_DEBUG_EVENT, c->log, 0,
"http ssl new session: %08XD:%d:%d",
hash, sess->session_id_length, len);
tp = ngx_timeofday();
sess_id->node.key = hash;
sess_id->node.data = (u_char) sess->session_id_length;
sess_id->id = id;
sess_id->len = len;
sess_id->session = cached_sess;
sess_id->expire = tp->sec + SSL_CTX_get_timeout(ssl_ctx);
sess_id->next = cache->session_cache_head.next;
sess_id->next->prev = sess_id;
sess_id->prev = &cache->session_cache_head;
cache->session_cache_head.next = sess_id;
ngx_rbtree_insert(cache->session_rbtree, &sess_id->node);
ngx_shmtx_unlock(&shpool->mutex);
return 0;
failed:
if (cached_sess) {
ngx_slab_free_locked(shpool, cached_sess);
}
if (sess_id) {
ngx_slab_free_locked(shpool, sess_id);
}
ngx_shmtx_unlock(&shpool->mutex);
ngx_log_error(NGX_LOG_ALERT, c->log, 0,
"could not add new SSL session to the session cache");
return 0;
}
static ngx_ssl_session_t *
ngx_ssl_get_cached_session(ngx_ssl_conn_t *ssl_conn, u_char *id, int len,
int *copy)
{
#if OPENSSL_VERSION_NUMBER >= 0x0090707fL
const
#endif
u_char *p;
uint32_t hash;
ngx_int_t rc;
ngx_time_t *tp;
ngx_shm_zone_t *shm_zone;
ngx_slab_pool_t *shpool;
ngx_connection_t *c;
ngx_rbtree_node_t *node, *sentinel;
ngx_ssl_session_t *sess;
ngx_ssl_sess_id_t *sess_id;
ngx_ssl_session_cache_t *cache;
u_char buf[NGX_SSL_MAX_SESSION_SIZE];
c = ngx_ssl_get_connection(ssl_conn);
hash = ngx_crc32_short(id, (size_t) len);
*copy = 0;
ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
"http ssl get session: %08XD:%d", hash, len);
shm_zone = SSL_CTX_get_ex_data(SSL_get_SSL_CTX(ssl_conn),
ngx_ssl_session_cache_index);
cache = shm_zone->data;
if (cache->session_rbtree == NULL) {
return NULL;
}
sess = NULL;
shpool = (ngx_slab_pool_t *) shm_zone->shm.addr;
ngx_shmtx_lock(&shpool->mutex);
node = cache->session_rbtree->root;
sentinel = cache->session_rbtree->sentinel;
while (node != sentinel) {
if (hash < node->key) {
node = node->left;
continue;
}
if (hash > node->key) {
node = node->right;
continue;
}
/* hash == node->key */
do {
sess_id = (ngx_ssl_sess_id_t *) node;
rc = ngx_memn2cmp(id, sess_id->id,
(size_t) len, (size_t) node->data);
if (rc == 0) {
tp = ngx_timeofday();
if (sess_id->expire > tp->sec) {
ngx_memcpy(buf, sess_id->session, sess_id->len);
ngx_shmtx_unlock(&shpool->mutex);
p = buf;
sess = d2i_SSL_SESSION(NULL, &p, sess_id->len);
return sess;
}
sess_id->next->prev = sess_id->prev;
sess_id->prev->next = sess_id->next;
ngx_rbtree_delete(cache->session_rbtree, node);
ngx_slab_free_locked(shpool, sess_id->session);
#if (NGX_PTR_SIZE == 4)
ngx_slab_free_locked(shpool, sess_id->id);
#endif
ngx_slab_free_locked(shpool, sess_id);
sess = NULL;
goto done;
}
node = (rc < 0) ? node->left : node->right;
} while (node != sentinel && hash == node->key);
break;
}
done:
ngx_shmtx_unlock(&shpool->mutex);
return sess;
}
static void
ngx_ssl_remove_session(SSL_CTX *ssl, ngx_ssl_session_t *sess)
{
size_t len;
u_char *id;
uint32_t hash;
ngx_int_t rc;
ngx_shm_zone_t *shm_zone;
ngx_slab_pool_t *shpool;
ngx_rbtree_node_t *node, *sentinel;
ngx_ssl_sess_id_t *sess_id;
ngx_ssl_session_cache_t *cache;
shm_zone = SSL_CTX_get_ex_data(ssl, ngx_ssl_session_cache_index);
cache = shm_zone->data;
id = sess->session_id;
len = (size_t) sess->session_id_length;
hash = ngx_crc32_short(id, len);
ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ngx_cycle->log, 0,
"http ssl remove session: %08XD:%uz", hash, len);
shpool = (ngx_slab_pool_t *) shm_zone->shm.addr;
ngx_shmtx_lock(&shpool->mutex);
node = cache->session_rbtree->root;
sentinel = cache->session_rbtree->sentinel;
while (node != sentinel) {
if (hash < node->key) {
node = node->left;
continue;
}
if (hash > node->key) {
node = node->right;
continue;
}
/* hash == node->key */
do {
sess_id = (ngx_ssl_sess_id_t *) node;
rc = ngx_memn2cmp(id, sess_id->id, len, (size_t) node->data);
if (rc == 0) {
sess_id->next->prev = sess_id->prev;
sess_id->prev->next = sess_id->next;
ngx_rbtree_delete(cache->session_rbtree, node);
ngx_slab_free_locked(shpool, sess_id->session);
#if (NGX_PTR_SIZE == 4)
ngx_slab_free_locked(shpool, sess_id->id);
#endif
ngx_slab_free_locked(shpool, sess_id);
goto done;
}
node = (rc < 0) ? node->left : node->right;
} while (node != sentinel && hash == node->key);
break;
}
done:
ngx_shmtx_unlock(&shpool->mutex);
}
static void
ngx_ssl_expire_sessions(ngx_ssl_session_cache_t *cache,
ngx_slab_pool_t *shpool, ngx_uint_t n)
{
ngx_time_t *tp;
ngx_ssl_sess_id_t *sess_id;
tp = ngx_timeofday();
while (n < 3) {
sess_id = cache->session_cache_tail.prev;
if (sess_id == &cache->session_cache_head) {
return;
}
if (n++ != 0 && sess_id->expire > tp->sec) {
break;
}
sess_id->next->prev = sess_id->prev;
sess_id->prev->next = sess_id->next;
ngx_rbtree_delete(cache->session_rbtree, &sess_id->node);
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, ngx_cycle->log, 0,
"expire session: %08Xi", sess_id->node.key);
ngx_slab_free_locked(shpool, sess_id->session);
#if (NGX_PTR_SIZE == 4)
ngx_slab_free_locked(shpool, sess_id->id);
#endif
ngx_slab_free_locked(shpool, sess_id);
}
}
static void
ngx_ssl_session_rbtree_insert_value(ngx_rbtree_node_t *temp,
ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel)
{
ngx_ssl_sess_id_t *sess_id, *sess_id_temp;
for ( ;; ) {
if (node->key < temp->key) {
if (temp->left == sentinel) {
temp->left = node;
break;
}
temp = temp->left;
} else if (node->key > temp->key) {
if (temp->right == sentinel) {
temp->right = node;
break;
}
temp = temp->right;
} else { /* node->key == temp->key */
sess_id = (ngx_ssl_sess_id_t *) node;
sess_id_temp = (ngx_ssl_sess_id_t *) temp;
if (ngx_memn2cmp(sess_id->id, sess_id_temp->id,
(size_t) node->data, (size_t) temp->data)
< 0)
{
if (temp->left == sentinel) {
temp->left = node;
break;
}
temp = temp->left;
} else {
if (temp->right == sentinel) {
temp->right = node;
break;
}
temp = temp->right;
}
}
}
node->parent = temp;
node->left = sentinel;
node->right = sentinel;
ngx_rbt_red(node);
}
void
ngx_ssl_cleanup_ctx(void *data)
{
ngx_ssl_t *ssl = data;
SSL_CTX_free(ssl->ctx);
}
ngx_int_t
ngx_ssl_get_protocol(ngx_connection_t *c, ngx_pool_t *pool, ngx_str_t *s)
{
s->data = (u_char *) SSL_get_version(c->ssl->connection);
return NGX_OK;
}
ngx_int_t
ngx_ssl_get_cipher_name(ngx_connection_t *c, ngx_pool_t *pool, ngx_str_t *s)
{
s->data = (u_char *) SSL_get_cipher_name(c->ssl->connection);
return NGX_OK;
}
ngx_int_t
ngx_ssl_get_subject_dn(ngx_connection_t *c, ngx_pool_t *pool, ngx_str_t *s)
{
char *p;
size_t len;
X509 *cert;
X509_NAME *name;
s->len = 0;
cert = SSL_get_peer_certificate(c->ssl->connection);
if (cert == NULL) {
return NGX_OK;
}
name = X509_get_subject_name(cert);
if (name == NULL) {
return NGX_ERROR;
}
p = X509_NAME_oneline(name, NULL, 0);
for (len = 0; p[len]; len++) { /* void */ }
s->len = len;
s->data = ngx_palloc(pool, len);
if (s->data == NULL) {
OPENSSL_free(p);
return NGX_ERROR;
}
ngx_memcpy(s->data, p, len);
OPENSSL_free(p);
return NGX_OK;
}
ngx_int_t
ngx_ssl_get_issuer_dn(ngx_connection_t *c, ngx_pool_t *pool, ngx_str_t *s)
{
char *p;
size_t len;
X509 *cert;
X509_NAME *name;
s->len = 0;
cert = SSL_get_peer_certificate(c->ssl->connection);
if (cert == NULL) {
return NGX_OK;
}
name = X509_get_issuer_name(cert);
if (name == NULL) {
return NGX_ERROR;
}
p = X509_NAME_oneline(name, NULL, 0);
for (len = 0; p[len]; len++) { /* void */ }
s->len = len;
s->data = ngx_palloc(pool, len);
if (s->data == NULL) {
OPENSSL_free(p);
return NGX_ERROR;
}
ngx_memcpy(s->data, p, len);
OPENSSL_free(p);
return NGX_OK;
}
ngx_int_t
ngx_ssl_get_serial_number(ngx_connection_t *c, ngx_pool_t *pool, ngx_str_t *s)
{
size_t len;
X509 *cert;
BIO *bio;
s->len = 0;
cert = SSL_get_peer_certificate(c->ssl->connection);
if (cert == NULL) {
return NGX_OK;
}
bio = BIO_new(BIO_s_mem());
if (bio == NULL) {
return NGX_ERROR;
}
i2a_ASN1_INTEGER(bio, X509_get_serialNumber(cert));
len = BIO_pending(bio);
s->len = len;
s->data = ngx_palloc(pool, len);
if (s->data == NULL) {
BIO_free(bio);
return NGX_ERROR;
}
BIO_read(bio, s->data, len);
BIO_free(bio);
return NGX_OK;
}
static void *
ngx_openssl_create_conf(ngx_cycle_t *cycle)
{
ngx_openssl_conf_t *oscf;
oscf = ngx_pcalloc(cycle->pool, sizeof(ngx_openssl_conf_t));
if (oscf == NULL) {
return NGX_CONF_ERROR;
}
/*
* set by ngx_pcalloc():
*
* oscf->engine.len = 0;
* oscf->engine.data = NULL;
*/
return oscf;
}
static char *
ngx_openssl_init_conf(ngx_cycle_t *cycle, void *conf)
{
#if (NGX_SSL_ENGINE)
ngx_openssl_conf_t *oscf = conf;
ENGINE *engine;
if (oscf->engine.len == 0) {
return NGX_CONF_OK;
}
engine = ENGINE_by_id((const char *) oscf->engine.data);
if (engine == NULL) {
ngx_ssl_error(NGX_LOG_WARN, cycle->log, 0,
"ENGINE_by_id(\"%V\") failed", &oscf->engine);
return NGX_CONF_ERROR;
}
if (ENGINE_set_default(engine, ENGINE_METHOD_ALL) == 0) {
ngx_ssl_error(NGX_LOG_WARN, cycle->log, 0,
"ENGINE_set_default(\"%V\", ENGINE_METHOD_ALL) failed",
&oscf->engine);
return NGX_CONF_ERROR;
}
ENGINE_free(engine);
#endif
return NGX_CONF_OK;
}
#if !(NGX_SSL_ENGINE)
static char *
ngx_openssl_noengine(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"\"ssl_engine\" directive is available only in "
"OpenSSL 0.9.7 and higher,");
return NGX_CONF_ERROR;
}
#endif
static void
ngx_openssl_exit(ngx_cycle_t *cycle)
{
#if (NGX_SSL_ENGINE)
ENGINE_cleanup();
#endif
}