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SSL: support AES256 encryption of tickets. This implies ticket key size of 80 bytes instead of previously used 48, as both HMAC and AES keys are 32 bytes now. When an old 48-byte ticket key is provided, we fall back to using backward-compatible AES128 encryption. OpenSSL switched to using AES256 in 1.1.0, and we are providing equivalent security. While here, order of HMAC and AES keys was reverted to make the implementation compatible with keys used by OpenSSL with SSL_CTX_set_tlsext_ticket_keys(). Prodded by Christian Klinger.
author Maxim Dounin <mdounin@mdounin.ru>
date Fri, 23 Dec 2016 17:28:20 +0300
parents e75e854657ba
children 08dc60979133
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/*
 * Copyright (C) Igor Sysoev
 * Copyright (C) Nginx, Inc.
 */


#ifndef _NGX_EVENT_OPENSSL_H_INCLUDED_
#define _NGX_EVENT_OPENSSL_H_INCLUDED_


#include <ngx_config.h>
#include <ngx_core.h>

#include <openssl/ssl.h>
#include <openssl/err.h>
#include <openssl/bn.h>
#include <openssl/conf.h>
#include <openssl/crypto.h>
#include <openssl/dh.h>
#ifndef OPENSSL_NO_ENGINE
#include <openssl/engine.h>
#endif
#include <openssl/evp.h>
#ifndef OPENSSL_NO_OCSP
#include <openssl/ocsp.h>
#endif
#include <openssl/rand.h>
#include <openssl/rsa.h>
#include <openssl/x509.h>
#include <openssl/x509v3.h>

#define NGX_SSL_NAME     "OpenSSL"


#if (defined LIBRESSL_VERSION_NUMBER && OPENSSL_VERSION_NUMBER == 0x20000000L)
#undef OPENSSL_VERSION_NUMBER
#define OPENSSL_VERSION_NUMBER  0x1000107fL
#endif


#if (OPENSSL_VERSION_NUMBER >= 0x10100001L)

#define ngx_ssl_version()       OpenSSL_version(OPENSSL_VERSION)

#else

#define ngx_ssl_version()       SSLeay_version(SSLEAY_VERSION)

#endif


#define ngx_ssl_session_t       SSL_SESSION
#define ngx_ssl_conn_t          SSL


struct ngx_ssl_s {
    SSL_CTX                    *ctx;
    ngx_log_t                  *log;
    size_t                      buffer_size;
};


struct ngx_ssl_connection_s {
    ngx_ssl_conn_t             *connection;
    SSL_CTX                    *session_ctx;

    ngx_int_t                   last;
    ngx_buf_t                  *buf;
    size_t                      buffer_size;

    ngx_connection_handler_pt   handler;

    ngx_event_handler_pt        saved_read_handler;
    ngx_event_handler_pt        saved_write_handler;

    unsigned                    handshaked:1;
    unsigned                    renegotiation:1;
    unsigned                    buffer:1;
    unsigned                    no_wait_shutdown:1;
    unsigned                    no_send_shutdown:1;
    unsigned                    handshake_buffer_set:1;
};


#define NGX_SSL_NO_SCACHE            -2
#define NGX_SSL_NONE_SCACHE          -3
#define NGX_SSL_NO_BUILTIN_SCACHE    -4
#define NGX_SSL_DFLT_BUILTIN_SCACHE  -5


#define NGX_SSL_MAX_SESSION_SIZE  4096

typedef struct ngx_ssl_sess_id_s  ngx_ssl_sess_id_t;

struct ngx_ssl_sess_id_s {
    ngx_rbtree_node_t           node;
    u_char                     *id;
    size_t                      len;
    u_char                     *session;
    ngx_queue_t                 queue;
    time_t                      expire;
#if (NGX_PTR_SIZE == 8)
    void                       *stub;
    u_char                      sess_id[32];
#endif
};


typedef struct {
    ngx_rbtree_t                session_rbtree;
    ngx_rbtree_node_t           sentinel;
    ngx_queue_t                 expire_queue;
} ngx_ssl_session_cache_t;


#ifdef SSL_CTRL_SET_TLSEXT_TICKET_KEY_CB

typedef struct {
    size_t                      size;
    u_char                      name[16];
    u_char                      hmac_key[32];
    u_char                      aes_key[32];
} ngx_ssl_session_ticket_key_t;

#endif


#define NGX_SSL_SSLv2    0x0002
#define NGX_SSL_SSLv3    0x0004
#define NGX_SSL_TLSv1    0x0008
#define NGX_SSL_TLSv1_1  0x0010
#define NGX_SSL_TLSv1_2  0x0020


#define NGX_SSL_BUFFER   1
#define NGX_SSL_CLIENT   2

#define NGX_SSL_BUFSIZE  16384


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);
ngx_int_t ngx_ssl_certificates(ngx_conf_t *cf, ngx_ssl_t *ssl,
    ngx_array_t *certs, ngx_array_t *keys, ngx_array_t *passwords);
ngx_int_t ngx_ssl_certificate(ngx_conf_t *cf, ngx_ssl_t *ssl,
    ngx_str_t *cert, ngx_str_t *key, ngx_array_t *passwords);
ngx_int_t ngx_ssl_ciphers(ngx_conf_t *cf, ngx_ssl_t *ssl, ngx_str_t *ciphers,
    ngx_uint_t prefer_server_ciphers);
ngx_int_t ngx_ssl_client_certificate(ngx_conf_t *cf, ngx_ssl_t *ssl,
    ngx_str_t *cert, ngx_int_t depth);
ngx_int_t ngx_ssl_trusted_certificate(ngx_conf_t *cf, ngx_ssl_t *ssl,
    ngx_str_t *cert, ngx_int_t depth);
ngx_int_t ngx_ssl_crl(ngx_conf_t *cf, ngx_ssl_t *ssl, ngx_str_t *crl);
ngx_int_t ngx_ssl_stapling(ngx_conf_t *cf, ngx_ssl_t *ssl,
    ngx_str_t *file, ngx_str_t *responder, ngx_uint_t verify);
ngx_int_t ngx_ssl_stapling_resolver(ngx_conf_t *cf, ngx_ssl_t *ssl,
    ngx_resolver_t *resolver, ngx_msec_t resolver_timeout);
RSA *ngx_ssl_rsa512_key_callback(ngx_ssl_conn_t *ssl_conn, int is_export,
    int key_length);
ngx_array_t *ngx_ssl_read_password_file(ngx_conf_t *cf, ngx_str_t *file);
ngx_int_t ngx_ssl_dhparam(ngx_conf_t *cf, ngx_ssl_t *ssl, ngx_str_t *file);
ngx_int_t ngx_ssl_ecdh_curve(ngx_conf_t *cf, ngx_ssl_t *ssl, ngx_str_t *name);
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);
ngx_int_t ngx_ssl_session_ticket_keys(ngx_conf_t *cf, ngx_ssl_t *ssl,
    ngx_array_t *paths);
ngx_int_t ngx_ssl_session_cache_init(ngx_shm_zone_t *shm_zone, void *data);
ngx_int_t ngx_ssl_create_connection(ngx_ssl_t *ssl, ngx_connection_t *c,
    ngx_uint_t flags);

void ngx_ssl_remove_cached_session(SSL_CTX *ssl, ngx_ssl_session_t *sess);
ngx_int_t ngx_ssl_set_session(ngx_connection_t *c, ngx_ssl_session_t *session);
#define ngx_ssl_get_session(c)      SSL_get1_session(c->ssl->connection)
#define ngx_ssl_free_session        SSL_SESSION_free
#define ngx_ssl_get_connection(ssl_conn)                                      \
    SSL_get_ex_data(ssl_conn, ngx_ssl_connection_index)
#define ngx_ssl_get_server_conf(ssl_ctx)                                      \
    SSL_CTX_get_ex_data(ssl_ctx, ngx_ssl_server_conf_index)

#define ngx_ssl_verify_error_optional(n)                                      \
    (n == X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT                              \
     || n == X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN                             \
     || n == X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY                     \
     || n == X509_V_ERR_CERT_UNTRUSTED                                        \
     || n == X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE)

ngx_int_t ngx_ssl_check_host(ngx_connection_t *c, ngx_str_t *name);


ngx_int_t ngx_ssl_get_protocol(ngx_connection_t *c, ngx_pool_t *pool,
    ngx_str_t *s);
ngx_int_t ngx_ssl_get_cipher_name(ngx_connection_t *c, ngx_pool_t *pool,
    ngx_str_t *s);
ngx_int_t ngx_ssl_get_ciphers(ngx_connection_t *c, ngx_pool_t *pool,
    ngx_str_t *s);
ngx_int_t ngx_ssl_get_curves(ngx_connection_t *c, ngx_pool_t *pool,
    ngx_str_t *s);
ngx_int_t ngx_ssl_get_session_id(ngx_connection_t *c, ngx_pool_t *pool,
    ngx_str_t *s);
ngx_int_t ngx_ssl_get_session_reused(ngx_connection_t *c, ngx_pool_t *pool,
    ngx_str_t *s);
ngx_int_t ngx_ssl_get_server_name(ngx_connection_t *c, ngx_pool_t *pool,
    ngx_str_t *s);
ngx_int_t ngx_ssl_get_raw_certificate(ngx_connection_t *c, ngx_pool_t *pool,
    ngx_str_t *s);
ngx_int_t ngx_ssl_get_certificate(ngx_connection_t *c, ngx_pool_t *pool,
    ngx_str_t *s);
ngx_int_t ngx_ssl_get_subject_dn(ngx_connection_t *c, ngx_pool_t *pool,
    ngx_str_t *s);
ngx_int_t ngx_ssl_get_issuer_dn(ngx_connection_t *c, ngx_pool_t *pool,
    ngx_str_t *s);
ngx_int_t ngx_ssl_get_subject_dn_legacy(ngx_connection_t *c, ngx_pool_t *pool,
    ngx_str_t *s);
ngx_int_t ngx_ssl_get_issuer_dn_legacy(ngx_connection_t *c, ngx_pool_t *pool,
    ngx_str_t *s);
ngx_int_t ngx_ssl_get_serial_number(ngx_connection_t *c, ngx_pool_t *pool,
    ngx_str_t *s);
ngx_int_t ngx_ssl_get_fingerprint(ngx_connection_t *c, ngx_pool_t *pool,
    ngx_str_t *s);
ngx_int_t ngx_ssl_get_client_verify(ngx_connection_t *c, ngx_pool_t *pool,
    ngx_str_t *s);
ngx_int_t ngx_ssl_get_client_v_start(ngx_connection_t *c, ngx_pool_t *pool,
    ngx_str_t *s);
ngx_int_t ngx_ssl_get_client_v_end(ngx_connection_t *c, ngx_pool_t *pool,
    ngx_str_t *s);
ngx_int_t ngx_ssl_get_client_v_remain(ngx_connection_t *c, ngx_pool_t *pool,
    ngx_str_t *s);


ngx_int_t ngx_ssl_handshake(ngx_connection_t *c);
ssize_t ngx_ssl_recv(ngx_connection_t *c, u_char *buf, size_t size);
ssize_t ngx_ssl_write(ngx_connection_t *c, u_char *data, size_t size);
ssize_t ngx_ssl_recv_chain(ngx_connection_t *c, ngx_chain_t *cl, off_t limit);
ngx_chain_t *ngx_ssl_send_chain(ngx_connection_t *c, ngx_chain_t *in,
    off_t limit);
void ngx_ssl_free_buffer(ngx_connection_t *c);
ngx_int_t ngx_ssl_shutdown(ngx_connection_t *c);
void ngx_cdecl ngx_ssl_error(ngx_uint_t level, ngx_log_t *log, ngx_err_t err,
    char *fmt, ...);
void ngx_ssl_cleanup_ctx(void *data);


extern int  ngx_ssl_connection_index;
extern int  ngx_ssl_server_conf_index;
extern int  ngx_ssl_session_cache_index;
extern int  ngx_ssl_session_ticket_keys_index;
extern int  ngx_ssl_certificate_index;
extern int  ngx_ssl_next_certificate_index;
extern int  ngx_ssl_certificate_name_index;
extern int  ngx_ssl_stapling_index;


#endif /* _NGX_EVENT_OPENSSL_H_INCLUDED_ */