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http_ssl.h
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/* Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You 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. */ /** * @file http_ssl.h * @brief SSL protocol handling * * @defgroup APACHE_CORE_PROTO SSL Protocol Handling * @ingroup APACHE_CORE * @{ */ #ifndef APACHE_HTTP_SSL_H #define APACHE_HTTP_SSL_H #include "httpd.h" #include "apr_portable.h" #include "apr_mmap.h" #ifdef __cplusplus extern "C" { #endif struct ap_conf_vector_t; /** * This hook allows modules that manage SSL connection to register their * inquiry function for checking if a connection is using SSL from them. * @param c The current connection * @return OK if the connection is using SSL, DECLINED if not. * @ingroup hooks */ AP_DECLARE_HOOK(int,ssl_conn_is_ssl,(conn_rec *c)) /** * Return != 0 iff the connection is encrypted with SSL. * @param c the connection */ AP_DECLARE(int) ap_ssl_conn_is_ssl(conn_rec *c); /** * This hook declares a connection to be outgoing and the configuration that applies to it. * This hook can be called several times in the lifetime of an outgoing connection, e.g. * when it is re-used in different request contexts. It will at least be called after the * connection was created and before the pre-connection hooks is invoked. * All outgoing-connection hooks are run until one returns something other than DECLINE. * if enable_ssl != 0, a hook that sets up SSL for the connection needs to return OK * to prevent subsequent hooks from doing the same. * * @param c The connection on which requests/data are to be sent. * @param dir_conf The directory configuration in which this connection is being used. * @param enable_ssl If != 0, the SSL protocol should be enabled for this connection. * @return DECLINED, OK when ssl was enabled */ AP_DECLARE_HOOK(int, ssl_bind_outgoing, (conn_rec *c, struct ap_conf_vector_t *dir_conf, int enable_ssl)) /** * Assures the connection is marked as outgoing and invokes the ssl_bind_outgoing hook. * This may be called several times on an outgoing connection with varying dir_conf * values. require_ssl is not allowed to change on the same connection. * * @param c The connection on which requests/data are to be sent. * @param dir_conf The directory configuration in which this connection is being used. * @param require_ssl != 0 iff this connection needs to be secured by SSL/TLS protocol. * @return OK iff ssl was required and is enabled, DECLINED otherwise */ AP_DECLARE(int) ap_ssl_bind_outgoing(conn_rec *c, struct ap_conf_vector_t *dir_conf, int require_ssl); /** * Return != 0 iff handlers/hooks for outgoing connections are registered. */ AP_DECLARE(int) ap_ssl_has_outgoing_handlers(void); /** * This hook allows modules to look up SSL related variables for a * server/connection/request, depending on what they inquire. Some * variables will only be available for a connection/request, for example. * @param p The pool to allocate a returned value in, MUST be provided * @param s The server to inquire a value for, maybe NULL * @param c The current connection, maybe NULL * @param r The current request, maybe NULL * @param name The name of the variable to retrieve, MUST be provided * @return value or the variable or NULL if not provided/available * @ingroup hooks */ AP_DECLARE_HOOK(const char *,ssl_var_lookup, (apr_pool_t *p, server_rec *s, conn_rec *c, request_rec *r, const char *name)) /** * Lookup an SSL related variable for the server/connection/request or a global * value when all those parameters are set to NULL. Pool and name must always be * provided and the returned value (if not NULL) will be allocated from the pool. * @param p The pool to allocate a returned value in, MUST be provided * @param s The server to inquire a value for, maybe NULL * @param c The current connection, maybe NULL * @param r The current request, maybe NULL * @param name The name of the variable to retrieve, MUST be provided * @return value or the variable or NULL if not provided/available */ AP_DECLARE(const char *) ap_ssl_var_lookup(apr_pool_t *p, server_rec *s, conn_rec *c, request_rec *r, const char *name); /** * Register to provide certificate/key files for servers. Certificate files are * expected to contain the certificate chain, beginning with the server's certificate, * excluding the trust anchor, in PEM format. * They must be accompanied by a private key file, also in PEM format. * * @param s the server certificates are collected for * @param p the pool to use for allocations * @param cert_files an array of const char* with the path to the certificate chain * @param key_files an array of const char* with the path to the private key file * @return OK if files were added, DECLINED if not, or other for error. */ AP_DECLARE_HOOK(int, ssl_add_cert_files, (server_rec *s, apr_pool_t *p, apr_array_header_t *cert_files, apr_array_header_t *key_files)) /** * Collect certificate/key files from all providers registered. This includes * providers registered at the global 'ssl_add_cert_files', as well as those * installed in the OPTIONAL 'ssl_add_cert_files' hook as may be provided by * ssl modules. * * @param s the server certificates are collected for * @param p the pool to use for allocations * @param cert_files an array of const char* with the path to the certificate chain * @param key_files an array of const char* with the path to the private key file */ AP_DECLARE(apr_status_t) ap_ssl_add_cert_files(server_rec *s, apr_pool_t *p, apr_array_header_t *cert_files, apr_array_header_t *key_files); /** * Register to provide 'fallback' certificates in case no 'real' certificates * have been configured/added by other providers. Modules using these certificates * are encouraged to answer requests to this server with a 503 response code. * * @param s the server certificates are collected for * @param p the pool to use for allocations * @param cert_files an array of const char* with the path to the certificate chain * @param key_files an array of const char* with the path to the private key file * @return OK if files were added, DECLINED if not, or other for error. */ AP_DECLARE_HOOK(int, ssl_add_fallback_cert_files, (server_rec *s, apr_pool_t *p, apr_array_header_t *cert_files, apr_array_header_t *key_files)) /** * Collect 'fallback' certificate/key files from all registered providers, either * in the global 'ssl_add_fallback_cert_files' hook or the optional one of similar * name as provided by mod_ssl and sorts. * Certificates obtained this way are commonly self signed, temporary crutches. * To be used to the time it takes to retrieve a 'read', trusted certificate. * A module using fallbacks is encouraged to answer all requests with a 503. * * @param s the server certificates are collected for * @param p the pool to use for allocations * @param cert_files an array of const char* with the path to the certificate chain * @param key_files an array of const char* with the path to the private key file */ AP_DECLARE(apr_status_t) ap_ssl_add_fallback_cert_files(server_rec *s, apr_pool_t *p, apr_array_header_t *cert_files, apr_array_header_t *key_files); /** * On TLS connections that do not relate to a configured virtual host * allow modules to provide a certificate and key to be used on the connection. * * A Certificate PEM added must be accompanied by a private key PEM. The private * key PEM may be given by a NULL pointer, in which case it is expected to be found in * the certificate PEM string. */ AP_DECLARE_HOOK(int, ssl_answer_challenge, (conn_rec *c, const char *server_name, const char **pcert_pem, const char **pkey_pem)) /** * Returns != 0 iff the connection is a challenge to the server, for example * as defined in RFC 8555 for the 'tls-alpn-01' domain verification, and needs * a specific certificate as answer in the handshake. * * ALPN protocol negotiation via the hooks 'protocol_propose' and 'protocol_switch' * need to have run before this call is made. * * Certificate PEMs added must be accompanied by a private key PEM. The private * key PEM may be given by a NULL pointer, in which case it is expected to be found in * the certificate PEM string. * * A certificate provided this way needs to replace any other certificates selected * by configuration or 'ssl_add_cert_pems` on this connection. */ AP_DECLARE(int) ap_ssl_answer_challenge(conn_rec *c, const char *server_name, const char **pcert_pem, const char **pkey_pem); /** * Setup optional functions for ssl related queries so that functions * registered by old-style SSL module functions are interrogated by the * the new ap_is_ssl() and friends. Installs own optional functions, so that * old modules looking for these find one and get the correct results (shadowing). * * Needs to run in core's very early POST_CONFIG hook. * Modules providing such functions register their own optionals during * register_hooks(). Modules using such functions retrieve them often * in their own post-config or in the even later retrieval hook. When shadowing * other modules functions, core's early post-config is a good time. * @param pool The pool to use for allocations */ AP_DECLARE(void) ap_setup_ssl_optional_fns(apr_pool_t *pool); /** * Providers of OCSP status responses register at this hook. Installed hooks returning OK * are expected to provide later OCSP responses via a 'ap_ssl_ocsp_get_resp_hook'. * @param s the server being configured * @params p a memory pool to use * @param id opaque data uniquely identifying the certificate, provided by caller * @param pem PEM data of certificate first, followed by PEM of issuer cert * @return OK iff stapling is being provided */ AP_DECLARE_HOOK(int, ssl_ocsp_prime_hook, (server_rec *s, apr_pool_t *p, const char *id, apr_size_t id_len, const char *pem)) /** * Registering a certificate for Provisioning of OCSP responses. It is the caller's * responsibility to provide a global (apache instance) unique id for the certificate * that is then used later in retrieving the OCSP response. * A certificate can be primed this way more than once, however the same identifier * has to be provided each time (byte-wise same, not pointer same). * The memory pointed to by `id` and `pem` is only valid for the duration of the call. * * @param s the server being configured * @params p a memory pool to use * @param id opaque data uniquely identifying the certificate, provided by caller * @param pem PEM data of certificate first, followed by chain certs, at least the issuer * @return APR_SUCCESS iff OCSP responses will be provided. * APR_ENOENT when no provided was found or took responsibility. */ AP_DECLARE(apr_status_t) ap_ssl_ocsp_prime(server_rec *s, apr_pool_t *p, const char *id, apr_size_t id_len, const char *pem); /** * Callback to copy over the OCSP response data. If OCSP response data is not * available, this will be called with NULL, 0 parameters! * * Memory allocation methods and lifetime of data will vary per module and * SSL library used. The caller requesting OCSP data will need to make a copy * for his own use. * Any passed data may only be valid for the duration of the call. */ typedef void ap_ssl_ocsp_copy_resp(const unsigned char *der, apr_size_t der_len, void *userdata); /** * Asking for OCSP response DER data for a certificate formerly primed. * @param s the (SNI selected) server of the connection * @param c the connection * @param id identifier for the certifate, as used in ocsp_stapling_prime() * @param cb callback to invoke when response data is available * @param userdata caller supplied data passed to callback * @return OK iff response data has been provided, DECLINED otherwise */ AP_DECLARE_HOOK(int, ssl_ocsp_get_resp_hook, (server_rec *s, conn_rec *c, const char *id, apr_size_t id_len, ap_ssl_ocsp_copy_resp *cb, void *userdata)) /** * Retrieve the OCSP response data for a previously primed certificate. The id needs * to be byte-wise identical to the one used on priming. If the call return ARP_SUCCESS, * the callback has been invoked with the OCSP response DER data. * Otherwise, a different status code must be returned. Callers in SSL connection * handshakes are encouraged to continue the handshake without OCSP data for * server reliability. The decision to accept or reject a handshake with missing * OCSP stapling data needs to be done by the client. * For similar reasons, providers of responses might return seemingly expired ones * if they were unable to refresh a response in time. * * The memory pointed to by `id` is only valid for the duration of the call. * Also, the DER data passed to the callback is only valid for the duration * of the call. * * @param s the (SNI selected) server of the connection * @param c the connection * @param id identifier for the certifate, as used in ocsp_stapling_prime() * @param cb callback to invoke when response data is available * @param userdata caller supplied data passed to callback * @return APR_SUCCESS iff data has been provided */ AP_DECLARE(apr_status_t) ap_ssl_ocsp_get_resp(server_rec *s, conn_rec *c, const char *id, apr_size_t id_len, ap_ssl_ocsp_copy_resp *cb, void *userdata); #ifdef __cplusplus } #endif #endif /* !APACHE_HTTP_SSL_H */ /** @} */
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