source: mod_gnutls/include/mod_gnutls.h.in @ dab7a25

/**
 *  Copyright 2004-2005 Paul Querna
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 */

/* Apache Runtime Headers */
#include "httpd.h"
#include "http_config.h"
#include "http_protocol.h"
#include "http_connection.h"
#include "http_request.h"
#include "http_core.h"
#include "http_log.h"
#include "apr_buckets.h"
#include "apr_strings.h"
#include "apr_tables.h"
#include "ap_release.h"
#include "apr_fnmatch.h"
/* GnuTLS Library Headers */
#include <gnutls/gnutls.h>
#if GNUTLS_VERSION_MAJOR == 2
#include <gnutls/extra.h>
#endif
#include <gnutls/openpgp.h>
#include <gnutls/x509.h>

#ifndef __mod_gnutls_h_inc
#define __mod_gnutls_h_inc

#define HAVE_APR_MEMCACHE    @have_apr_memcache@

extern module AP_MODULE_DECLARE_DATA gnutls_module;

/* IO Filter names */
#define GNUTLS_OUTPUT_FILTER_NAME "gnutls_output_filter"
#define GNUTLS_INPUT_FILTER_NAME "gnutls_input_filter"
/* GnuTLS Constants */
#define GNUTLS_ENABLED_FALSE 0
#define GNUTLS_ENABLED_TRUE  1
/* Current module version */
#define MOD_GNUTLS_VERSION "0.5.10"
/* Module Debug Mode */
#define MOD_GNUTLS_DEBUG 1

/* 
 * Recent Versions of 2.1 renamed several hooks. 
 * This allows us to compile on 2.0.xx  
 */
#if AP_SERVER_MINORVERSION_NUMBER >= 2 || (AP_SERVER_MINORVERSION_NUMBER == 1 && AP_SERVER_PATCHLEVEL_NUMBER >= 3)
        #define USING_2_1_RECENT 1
#else
        #define USING_2_1_RECENT 0
#endif 

/* mod_gnutls Cache Types */
typedef enum {
        /* No Cache */
    mgs_cache_none,
        /* Use Old Berkley DB */
    mgs_cache_dbm,
        /* Use Gnu's version of Berkley DB */
    mgs_cache_gdbm,
#if HAVE_APR_MEMCACHE
        /* Use Memcache */
    mgs_cache_memcache
#endif
} mgs_cache_e;

/* Directory Configuration Record */
typedef struct {
    int client_verify_mode;
    const char* lua_bytecode;
    apr_size_t lua_bytecode_len;
} mgs_dirconf_rec;


/* The maximum number of certificates to send in a chain */
#define MAX_CHAIN_SIZE 8
/* The maximum number of SANs to read from a x509 certificate */
#define MAX_CERT_SAN 5

/* Server Configuration Record */
typedef struct {
        /* x509 Certificate Structure */
    gnutls_certificate_credentials_t certs; 
        /* SRP Certificate Structure*/
    gnutls_srp_server_credentials_t srp_creds;
        /* Annonymous Certificate Structure */
    gnutls_anon_server_credentials_t anon_creds;
        /* Current x509 Certificate CN [Common Name] */
    char* cert_cn;
        /* Current x509 Certificate SAN [Subject Alternate Name]s*/
        char* cert_san[MAX_CERT_SAN];
        /* A x509 Certificate Chain */
    gnutls_x509_crt_t *certs_x509_chain;
        /* Current x509 Certificate Private Key */
    gnutls_x509_privkey_t privkey_x509;
        /* OpenPGP Certificate */
    gnutls_openpgp_crt_t cert_pgp;
        /* OpenPGP Certificate Private Key */
    gnutls_openpgp_privkey_t privkey_pgp;
        /* Number of Certificates in Chain */
    unsigned int certs_x509_chain_num;
        /* Is the module enabled? */
    int enabled;
        /* GnuTLS Priorities */
    gnutls_priority_t priorities;
        /* GnuTLS RSA Parameters [Obselete] */
    gnutls_rsa_params_t rsa_params;
        /* GnuTLS DH Parameters */
    gnutls_dh_params_t dh_params;
        /* Cache timeout value */
    int cache_timeout;
        /* Chose Cache Type */
    mgs_cache_e cache_type;
    const char* cache_config;
    const char* srp_tpasswd_file;
    const char* srp_tpasswd_conf_file;
        /* A list of CA Certificates */
    gnutls_x509_crt_t *ca_list;
        /* OpenPGP Key Ring */
    gnutls_openpgp_keyring_t pgp_list;
        /* CA Certificate list size */
    unsigned int ca_list_size;
        /* Client Certificate Verification Mode */
    int client_verify_mode;
        /* Last Cache timestamp */
    apr_time_t last_cache_check;
        /* GnuTLS uses Session Tickets */
    int tickets; 
        /* Is mod_proxy enabled? */
    int proxy_enabled;
        /* A Plain HTTP request */
    int non_ssl_request;
} mgs_srvconf_rec;

/* Character Buffer */
typedef struct {
    int length;
    char *value;
} mgs_char_buffer_t;

/* GnuTLS Handle */
typedef struct {
        /* Server configuration record */
    mgs_srvconf_rec *sc;
        /* Connection record */
    conn_rec* c;
        /* GnuTLS Session handle */
    gnutls_session_t session;
        /* module input status */
    apr_status_t input_rc;
        /* Input filter */
    ap_filter_t *input_filter;
        /* Input Bucket Brigade */
    apr_bucket_brigade *input_bb;
        /* Input Read Type */
    apr_read_type_e input_block;
        /* Input Mode */
    ap_input_mode_t input_mode;
        /* Input Character Buffer */
    mgs_char_buffer_t input_cbuf;
        /* Input Character Array */
    char input_buffer[AP_IOBUFSIZE];
        /* module Output status */
    apr_status_t output_rc;
        /* Output filter */
    ap_filter_t *output_filter;
        /* Output Bucket Brigade */
    apr_bucket_brigade *output_bb;
        /* Output character array */
    char output_buffer[AP_IOBUFSIZE];
        /* Output buffer length */
    apr_size_t output_blen;
        /* Output length */
    apr_size_t output_length;
        /* General Status */
    int status;
} mgs_handle_t;



/** Functions in gnutls_io.c **/

/* apr_signal_block() for blocking SIGPIPE */
apr_status_t apr_signal_block(int signum);

 /* Proxy Support */
/* An optional function which returns non-zero if the given connection
is using SSL/TLS. */
APR_DECLARE_OPTIONAL_FN(int, ssl_is_https, (conn_rec *));
/* The ssl_proxy_enable() and ssl_engine_disable() optional functions
 * are used by mod_proxy to enable use of SSL for outgoing
 * connections. */
APR_DECLARE_OPTIONAL_FN(int, ssl_proxy_enable, (conn_rec *));
APR_DECLARE_OPTIONAL_FN(int, ssl_engine_disable, (conn_rec *));
int ssl_is_https(conn_rec *c);
int ssl_proxy_enable(conn_rec *c);
int ssl_engine_disable(conn_rec *c);
const char *mgs_set_proxy_engine(cmd_parms * parms, void *dummy,
    const char *arg);
apr_status_t mgs_cleanup_pre_config(void *data);

/**
 * mgs_filter_input will filter the input data
 * by decrypting it using GnuTLS and passes it cleartext.
 *
 * @param f     the filter info record
 * @param bb    the bucket brigade, where to store the result to
 * @param mode  what shall we read?
 * @param block a block index we shall read from?
 * @return result status
 */
apr_status_t mgs_filter_input(ap_filter_t * f,
                                     apr_bucket_brigade * bb,
                                     ap_input_mode_t mode,
                                     apr_read_type_e block,
                                     apr_off_t readbytes);

/**
 * mgs_filter_output will filter the encrypt
 * the incoming bucket using GnuTLS and passes it onto the next filter.
 *
 * @param f     the filter info record
 * @param bb    the bucket brigade, where to store the result to
 * @return result status
 */
apr_status_t mgs_filter_output(ap_filter_t * f,
                                      apr_bucket_brigade * bb);


/**
 * mgs_transport_read is called from GnuTLS to provide encrypted 
 * data from the client.
 *
 * @param ptr     pointer to the filter context
 * @param buffer  place to put data
 * @param len     maximum size
 * @return size   length of the data stored in buffer
 */
ssize_t mgs_transport_read(gnutls_transport_ptr_t ptr,
                                  void *buffer, size_t len);

/**
 * mgs_transport_write is called from GnuTLS to 
 * write data to the client.
 *
 * @param ptr     pointer to the filter context
 * @param buffer  buffer to write to the client
 * @param len     size of the buffer
 * @return size   length of the data written
 */
ssize_t mgs_transport_write(gnutls_transport_ptr_t ptr,
                                   const void *buffer, size_t len);


int mgs_rehandshake(mgs_handle_t * ctxt);



/**
 * Init the Cache after Configuration is done
 */
int mgs_cache_post_config(apr_pool_t *p, server_rec *s, 
                                 mgs_srvconf_rec *sc);
/**
 * Init the Cache inside each Process
 */
int mgs_cache_child_init(apr_pool_t *p, server_rec *s, 
                                mgs_srvconf_rec *sc);
/**
 * Setup the Session Caching
 */
int mgs_cache_session_init(mgs_handle_t *ctxt);

#define GNUTLS_SESSION_ID_STRING_LEN \
    ((GNUTLS_MAX_SESSION_ID + 1) * 2)
    
/**
 * Convert a SSL Session ID into a Null Terminated Hex Encoded String
 * @param id raw SSL Session ID
 * @param idlen Length of the raw Session ID
 * @param str Location to store the Hex Encoded String
 * @param strsize The Maximum Length that can be stored in str
 */
char *mgs_session_id2sz(unsigned char *id, int idlen,
                                char *str, int strsize);

/**
 * Convert a time_t into a Null Terminated String
 * @param t time_t time
 * @param str Location to store the Hex Encoded String
 * @param strsize The Maximum Length that can be stored in str
 */
char *mgs_time2sz(time_t t, char *str, int strsize);


/* Configuration Functions */

const char *mgs_set_srp_tpasswd_conf_file(cmd_parms * parms, void *dummy,
                                        const char *arg);
const char *mgs_set_srp_tpasswd_file(cmd_parms * parms, void *dummy,
                                        const char *arg);
const char *mgs_set_dh_file(cmd_parms * parms, void *dummy,
                                        const char *arg);
const char *mgs_set_cert_file(cmd_parms * parms, void *dummy,
                                        const char *arg);

const char *mgs_set_key_file(cmd_parms * parms, void *dummy,
                             const char *arg);

const char *mgs_set_pgpcert_file(cmd_parms * parms, void *dummy,
                                        const char *arg);

const char *mgs_set_pgpkey_file(cmd_parms * parms, void *dummy,
                             const char *arg);

const char *mgs_set_cache(cmd_parms * parms, void *dummy,
                          const char *type, const char* arg);

const char *mgs_set_cache_timeout(cmd_parms * parms, void *dummy,
                                  const char *arg);

const char *mgs_set_client_verify(cmd_parms * parms, void *dummy,
                                  const char *arg);

const char *mgs_set_client_ca_file(cmd_parms * parms, void *dummy,
                                   const char *arg);

const char *mgs_set_keyring_file(cmd_parms * parms, void *dummy,
                                   const char *arg);

const char *mgs_set_enabled(cmd_parms * parms, void *dummy,
                            const char *arg);
const char *mgs_set_export_certificates_enabled(cmd_parms * parms, void *dummy,
                            const char *arg);
const char *mgs_set_priorities(cmd_parms * parms, void *dummy,
                            const char *arg);
const char *mgs_set_tickets(cmd_parms * parms, void *dummy,
                            const char *arg);
                            
const char *mgs_set_require_section(cmd_parms *cmd, 
                                    void *mconfig, const char *arg);
void *mgs_config_server_create(apr_pool_t * p, server_rec * s);

void *mgs_config_dir_merge(apr_pool_t *p, void *basev, void *addv);

void *mgs_config_dir_create(apr_pool_t *p, char *dir);

const char *mgs_set_require_bytecode(cmd_parms *cmd, 
                                    void *mconfig, const char *arg);

mgs_srvconf_rec* mgs_find_sni_server(gnutls_session_t session);

/* mod_gnutls Hooks. */

int mgs_hook_pre_config(apr_pool_t * pconf,
                        apr_pool_t * plog, apr_pool_t * ptemp);

int mgs_hook_post_config(apr_pool_t * p, apr_pool_t * plog,
                         apr_pool_t * ptemp,
                         server_rec * base_server);

void mgs_hook_child_init(apr_pool_t *p, server_rec *s);

const char *mgs_hook_http_scheme(const request_rec * r);

apr_port_t mgs_hook_default_port(const request_rec * r);

int mgs_hook_pre_connection(conn_rec * c, void *csd);

int mgs_hook_fixups(request_rec *r);

int mgs_hook_authz(request_rec *r);

#endif /*  __mod_gnutls_h_inc */