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shellinabox/libhttp/ssl.h
KLuka f0437832d3 Added support for Perfect Forward Secrecy (#331) 
* Support for PFS is enabled with help of chiper suits that use ECDHE
  key exchange. OpenSSL added support for eliptic curve operations (EC)
  in version 0.9.8. Note that there are also some library distributions
  which don't support EC operations.
* Added precompiler guards for builds with OpenSSL older than 0.9.8 and
  builds with '--enable-runtime-loading' configure script option.
* Cleaned up some SSL related code.
2015-08-05 17:57:05 +02:00

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// ssl.h -- Support functions that find and load SSL support, if available
// Copyright (C) 2008-2009 Markus Gutschke <markus@shellinabox.com>
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License version 2 as
// published by the Free Software Foundation.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with this program; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//
// In addition to these license terms, the author grants the following
// additional rights:
//
// If you modify this program, or any covered work, by linking or
// combining it with the OpenSSL project's OpenSSL library (or a
// modified version of that library), containing parts covered by the
// terms of the OpenSSL or SSLeay licenses, the author
// grants you additional permission to convey the resulting work.
// Corresponding Source for a non-source form of such a combination
// shall include the source code for the parts of OpenSSL used as well
// as that of the covered work.
//
// You may at your option choose to remove this additional permission from
// the work, or from any part of it.
//
// It is possible to build this program in a way that it loads OpenSSL
// libraries at run-time. If doing so, the following notices are required
// by the OpenSSL and SSLeay licenses:
//
// This product includes software developed by the OpenSSL Project
// for use in the OpenSSL Toolkit. (http://www.openssl.org/)
//
// This product includes cryptographic software written by Eric Young
// (eay@cryptsoft.com)
//
//
// The most up-to-date version of this program is always available from
// http://shellinabox.com
#ifndef SSL_H__
#define SSL_H__
#include "config.h"
#include "libhttp/trie.h"
#if defined(HAVE_OPENSSL_BIO_H) && \
defined(HAVE_OPENSSL_ERR_H) && \
defined(HAVE_OPENSSL_SSL_H)
#define HAVE_OPENSSL 1
#include <openssl/bio.h>
#include <openssl/err.h>
#include <openssl/ssl.h>
#else
#undef HAVE_OPENSSL
typedef struct BIO BIO;
typedef struct BIO_METHOD BIO_METHOD;
typedef struct EC_KEY EC_KEY;
typedef struct SSL SSL;
typedef struct SSL_CTX SSL_CTX;
typedef struct SSL_METHOD SSL_METHOD;
typedef struct X509 X509;
#define SSL_ERROR_WANT_READ 2
#define SSL_ERROR_WANT_WRITE 3
#endif
// EC support was added to OpenSSL in 0.9.8, but it can be disabled in some
// distributions.
#if OPENSSL_VERSION_NUMBER >= 0x0090800fL && !defined(OPENSSL_NO_EC)
# define HAVE_OPENSSL_EC
#endif
#if defined(HAVE_DLOPEN)
extern long (*x_BIO_ctrl)(BIO *, int, long, void *);
extern BIO_METHOD *(*x_BIO_f_buffer)(void);
extern void (*x_BIO_free_all)(BIO *);
extern BIO *(*x_BIO_new)(BIO_METHOD *);
extern BIO *(*x_BIO_new_socket)(int, int);
extern BIO *(*x_BIO_pop)(BIO *);
extern BIO *(*x_BIO_push)(BIO *, BIO *);
#if defined(HAVE_OPENSSL_EC)
extern void (*x_EC_KEY_free)(EC_KEY *);
extern EC_KEY *(*x_EC_KEY_new_by_curve_name)(int);
#endif
extern void (*x_ERR_clear_error)(void);
extern unsigned long (*x_ERR_peek_error)(void);
extern long (*x_SSL_CTX_callback_ctrl)(SSL_CTX *, int, void (*)(void));
extern int (*x_SSL_CTX_check_private_key)(const SSL_CTX *);
extern long (*x_SSL_CTX_ctrl)(SSL_CTX *, int, long, void *);
extern void (*x_SSL_CTX_free)(SSL_CTX *);
extern SSL_CTX*(*x_SSL_CTX_new)(SSL_METHOD *);
extern int (*x_SSL_CTX_set_cipher_list)(SSL_CTX *ctx, const char *str);
extern int (*x_SSL_CTX_use_PrivateKey_file)(SSL_CTX *, const char *, int);
extern int (*x_SSL_CTX_use_PrivateKey_ASN1)(int, SSL_CTX *,
const unsigned char *, long);
extern int (*x_SSL_CTX_use_certificate_file)(SSL_CTX *, const char *, int);
extern int (*x_SSL_CTX_use_certificate_ASN1)(SSL_CTX *, long,
const unsigned char *);
extern long (*x_SSL_ctrl)(SSL *, int, long, void *);
extern void (*x_SSL_free)(SSL *);
extern int (*x_SSL_get_error)(const SSL *, int);
extern void *(*x_SSL_get_ex_data)(const SSL *, int);
extern BIO *(*x_SSL_get_rbio)(const SSL *);
extern const char *(*x_SSL_get_servername)(const SSL *, int);
extern BIO *(*x_SSL_get_wbio)(const SSL *);
extern int (*x_SSL_library_init)(void);
extern SSL *(*x_SSL_new)(SSL_CTX *);
extern int (*x_SSL_read)(SSL *, void *, int);
extern SSL_CTX*(*x_SSL_set_SSL_CTX)(SSL *, SSL_CTX *);
extern void (*x_SSL_set_accept_state)(SSL *);
extern void (*x_SSL_set_bio)(SSL *, BIO *, BIO *);
extern int (*x_SSL_set_ex_data)(SSL *, int, void *);
extern int (*x_SSL_shutdown)(SSL *);
extern int (*x_SSL_write)(SSL *, const void *, int);
extern SSL_METHOD *(*x_SSLv23_server_method)(void);
extern X509 * (*x_d2i_X509)(X509 **px, const unsigned char **in, int len);
extern void (*x_X509_free)(X509 *a);
extern void (*x_sk_zero)(void *st);
extern void *(*x_SSL_COMP_get_compression_methods)(void);
#define BIO_ctrl x_BIO_ctrl
#define BIO_f_buffer x_BIO_f_buffer
#define BIO_free_all x_BIO_free_all
#define BIO_new x_BIO_new
#define BIO_new_socket x_BIO_new_socket
#define BIO_pop x_BIO_pop
#define BIO_push x_BIO_push
#define EC_KEY_free x_EC_KEY_free
#define EC_KEY_new_by_curve_name x_EC_KEY_new_by_curve_name
#define ERR_clear_error x_ERR_clear_error
#define ERR_peek_error x_ERR_peek_error
#define SSL_CTX_callback_ctrl x_SSL_CTX_callback_ctrl
#define SSL_CTX_check_private_key x_SSL_CTX_check_private_key
#define SSL_CTX_ctrl x_SSL_CTX_ctrl
#define SSL_CTX_free x_SSL_CTX_free
#define SSL_CTX_new x_SSL_CTX_new
#define SSL_CTX_set_cipher_list x_SSL_CTX_set_cipher_list
#define SSL_CTX_use_PrivateKey_file x_SSL_CTX_use_PrivateKey_file
#define SSL_CTX_use_PrivateKey_ASN1 x_SSL_CTX_use_PrivateKey_ASN1
#define SSL_CTX_use_certificate_file x_SSL_CTX_use_certificate_file
#define SSL_CTX_use_certificate_ASN1 x_SSL_CTX_use_certificate_ASN1
#define SSL_ctrl x_SSL_ctrl
#define SSL_free x_SSL_free
#define SSL_get_error x_SSL_get_error
#define SSL_get_ex_data x_SSL_get_ex_data
#define SSL_get_rbio x_SSL_get_rbio
#define SSL_get_servername x_SSL_get_servername
#define SSL_get_wbio x_SSL_get_wbio
#define SSL_library_init x_SSL_library_init
#define SSL_new x_SSL_new
#define SSL_read x_SSL_read
#define SSL_set_SSL_CTX x_SSL_set_SSL_CTX
#define SSL_set_accept_state x_SSL_set_accept_state
#define SSL_set_bio x_SSL_set_bio
#define SSL_set_ex_data x_SSL_set_ex_data
#define SSL_shutdown x_SSL_shutdown
#define SSL_write x_SSL_write
#define SSLv23_server_method x_SSLv23_server_method
#define d2i_X509 x_d2i_X509
#define X509_free x_X509_free
#define sk_zero x_sk_zero
#define SSL_COMP_get_compression_methods x_SSL_COMP_get_compression_methods
#undef BIO_set_buffer_read_data
#undef SSL_CTX_set_tlsext_servername_arg
#undef SSL_CTX_set_tlsext_servername_callback
#undef SSL_CTX_set_tmp_ecdh
#undef SSL_get_app_data
#undef SSL_set_app_data
#undef SSL_set_mode
#define BIO_set_buffer_read_data(b, buf, num) \
(x_BIO_ctrl(b, BIO_C_SET_BUFF_READ_DATA, \
num, buf))
#define SSL_CTX_set_tlsext_servername_arg(ctx, arg) \
(x_SSL_CTX_ctrl(ctx, \
SSL_CTRL_SET_TLSEXT_SERVERNAME_ARG, \
0, (void *)arg))
#define SSL_CTX_set_tlsext_servername_callback(ctx, cb) \
(x_SSL_CTX_callback_ctrl(ctx, \
SSL_CTRL_SET_TLSEXT_SERVERNAME_CB, \
(void (*)(void))cb))
#define SSL_CTX_set_tmp_ecdh(ctx, ecdh) \
(x_SSL_CTX_ctrl(ctx, SSL_CTRL_SET_TMP_ECDH, \
0, (char *)ecdh))
#define SSL_get_app_data(s) (x_SSL_get_ex_data(s, 0))
#define SSL_set_app_data(s, arg) (x_SSL_set_ex_data(s, 0, (char *)arg))
#define SSL_set_mode(ssl, op) (x_SSL_ctrl((ssl), SSL_CTRL_MODE, (op), NULL))
#endif
struct SSLSupport {
int enabled;
SSL_CTX *sslContext;
char *sniCertificatePattern;
int generateMissing;
struct Trie sniContexts;
};
int serverSupportsSSL(void);
struct SSLSupport *newSSL();
void initSSL(struct SSLSupport *ssl);
void destroySSL(struct SSLSupport *ssl);
void deleteSSL(struct SSLSupport *ssl);
void sslSetCertificate(struct SSLSupport *ssl, const char *filename,
int autoGenerateMissing);
void sslSetCertificateFd(struct SSLSupport *ssl, int fd);
int sslEnable(struct SSLSupport *ssl, int enabled);
void sslBlockSigPipe();
int sslUnblockSigPipe();
int sslPromoteToSSL(struct SSLSupport *ssl, SSL **sslHndl, int fd,
const char *buf, int len);
void sslFreeHndl(SSL **sslHndl);
#endif
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