464 lines
16 KiB
C
464 lines
16 KiB
C
/*
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* WPA Supplicant / SSL/TLS interface definition
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* Copyright (c) 2004-2006, Jouni Malinen <jkmaline@cc.hut.fi>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Alternatively, this software may be distributed under the terms of BSD
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* license.
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*
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* See README and COPYING for more details.
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*/
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#ifndef TLS_H
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#define TLS_H
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struct tls_connection;
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struct tls_keys {
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const u8 *master_key;
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size_t master_key_len;
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const u8 *client_random;
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size_t client_random_len;
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const u8 *server_random;
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size_t server_random_len;
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/*
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* If TLS library does not provide access to master_key, but only to
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* EAP key block, this pointer can be set to point to the result of
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* PRF(master_secret, "client EAP encryption",
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* client_random + server_random).
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*/
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const u8 *eap_tls_prf;
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size_t eap_tls_prf_len;
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};
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struct tls_config {
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const char *opensc_engine_path;
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const char *pkcs11_engine_path;
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const char *pkcs11_module_path;
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};
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/**
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* struct tls_connection_params - Parameters for TLS connection
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* @ca_cert: File or reference name for CA X.509 certificate in PEM or DER
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* format
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* @ca_cert_blob: ca_cert as inlined data or %NULL if not used
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* @ca_cert_blob_len: ca_cert_blob length
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* @ca_path: Path to CA certificates (OpenSSL specific)
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* @subject_match: String to match in the subject of the peer certificate or
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* %NULL to allow all subjects
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* @altsubject_match: String to match in the alternative subject of the peer
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* certificate or %NULL to allow all alternative subjects
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* @client_cert: File or reference name for client X.509 certificate in PEM or
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* DER format
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* @client_cert_blob: client_cert as inlined data or %NULL if not used
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* @client_cert_blob_len: client_cert_blob length
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* @private_key: File or reference name for client private key in PEM or DER
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* format (traditional format (RSA PRIVATE KEY) or PKCS#8 (PRIVATE KEY)
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* @private_key_blob: private_key as inlined data or %NULL if not used
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* @private_key_blob_len: private_key_blob length
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* @private_key_passwd: Passphrase for decrypted private key, %NULL if no
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* passphrase is used.
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* @dh_file: File name for DH/DSA data in PEM format, or %NULL if not used
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* @dh_blob: dh_file as inlined data or %NULL if not used
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* @dh_blob_len: dh_blob length
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* @engine: 1 = use engine (e.g., a smartcard) for private key operations
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* (this is OpenSSL specific for now)
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* @engine_id: engine id string (this is OpenSSL specific for now)
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* @ppin: pointer to the pin variable in the configuration
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* (this is OpenSSL specific for now)
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* @key_id: the private key's key id (this is OpenSSL specific for now)
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*
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* TLS connection parameters to be configured with tls_connection_set_params().
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*
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* Certificates and private key can be configured either as a reference name
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* (file path or reference to certificate store) or by providing the same data
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* as a pointer to the data in memory. Only one option will be used for each
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* field.
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*/
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struct tls_connection_params {
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const char *ca_cert;
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const u8 *ca_cert_blob;
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size_t ca_cert_blob_len;
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const char *ca_path;
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const char *subject_match;
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const char *altsubject_match;
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const char *client_cert;
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const u8 *client_cert_blob;
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size_t client_cert_blob_len;
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const char *private_key;
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const u8 *private_key_blob;
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size_t private_key_blob_len;
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const char *private_key_passwd;
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const char *dh_file;
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const u8 *dh_blob;
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size_t dh_blob_len;
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/* OpenSSL specific variables */
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int engine;
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const char *engine_id;
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const char *pin;
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const char *key_id;
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};
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/**
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* tls_init - Initialize TLS library
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* @conf: Configuration data for TLS library
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* Returns: Context data to be used as tls_ctx in calls to other functions,
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* or %NULL on failure.
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*
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* Called once during program startup and once for each RSN pre-authentication
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* session. In other words, there can be two concurrent TLS contexts. If global
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* library initialization is needed (i.e., one that is shared between both
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* authentication types), the TLS library wrapper should maintain a reference
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* counter and do global initialization only when moving from 0 to 1 reference.
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*/
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void * tls_init(const struct tls_config *conf);
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/**
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* tls_deinit - Deinitialize TLS library
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* @tls_ctx: TLS context data from tls_init()
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*
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* Called once during program shutdown and once for each RSN pre-authentication
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* session. If global library deinitialization is needed (i.e., one that is
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* shared between both authentication types), the TLS library wrapper should
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* maintain a reference counter and do global deinitialization only when moving
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* from 1 to 0 references.
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*/
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void tls_deinit(void *tls_ctx);
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/**
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* tls_get_errors - Process pending errors
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* @tls_ctx: TLS context data from tls_init()
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*
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* Returns: Number of found error, 0 if no errors detected.
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*
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* Process all pending TLS errors.
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*/
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int tls_get_errors(void *tls_ctx);
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/**
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* tls_connection_init - Initialize a new TLS connection
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* @tls_ctx: TLS context data from tls_init()
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*
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* Returns: Connection context data, conn for other function calls
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*/
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struct tls_connection * tls_connection_init(void *tls_ctx);
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/**
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* tls_connection_deinit - Free TLS connection data
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* @tls_ctx: TLS context data from tls_init()
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* @conn: Connection context data from tls_connection_init()
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*
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* Release all resources allocated for TLS connection.
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*/
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void tls_connection_deinit(void *tls_ctx, struct tls_connection *conn);
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/**
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* tls_connection_established - Has the TLS connection been completed?
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* @tls_ctx: TLS context data from tls_init()
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* @conn: Connection context data from tls_connection_init()
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*
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* Returns: 1 if TLS connection has been completed, 0 if not.
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*/
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int tls_connection_established(void *tls_ctx, struct tls_connection *conn);
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/**
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* tls_connection_shutdown - Shutdown TLS connection data.
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* @tls_ctx: TLS context data from tls_init()
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* @conn: Connection context data from tls_connection_init()
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*
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* Returns: 0 on success, -1 on failure
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*
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* Shutdown current TLS connection without releasing all resources. New
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* connection can be started by using the same conn without having to call
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* tls_connection_init() or setting certificates etc. again. The new
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* connection should try to use session resumption.
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*/
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int tls_connection_shutdown(void *tls_ctx, struct tls_connection *conn);
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enum {
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TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED = -3,
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TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED = -2
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};
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/**
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* tls_connection_set_params - Set TLS connection parameters
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* @tls_ctx: TLS context data from tls_init()
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* @conn: Connection context data from tls_connection_init()
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* @params: Connection parameters
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*
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* Returns: 0 on success, -1 on failure,
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* TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED (-2) on possible PIN error causing
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* PKCS#11 engine failure, or
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* TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED (-3) on failure to verify the
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* PKCS#11 engine private key.
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*/
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int tls_connection_set_params(void *tls_ctx, struct tls_connection *conn,
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const struct tls_connection_params *params);
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/**
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* tls_global_ca_cert - Set trusted CA certificate for all TLS connections
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* @tls_ctx: TLS context data from tls_init()
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* @ca_cert: File name for CA certificate in PEM or DER format
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* %NULL to allow all subjects
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*
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* Returns: 0 on success, -1 on failure
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*/
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int tls_global_ca_cert(void *tls_ctx, const char *ca_cert);
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/**
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* tls_global_set_verify - Set global certificate verification options
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* @tls_ctx: TLS context data from tls_init()
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* @check_crl: 0 = do not verify CRLs, 1 = verify CRL for the user certificate,
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* 2 = verify CRL for all certificates
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*
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* Returns: 0 on success, -1 on failure
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*/
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int tls_global_set_verify(void *tls_ctx, int check_crl);
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/**
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* tls_connection_set_verify - Set certificate verification options
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* @tls_ctx: TLS context data from tls_init()
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* @conn: Connection context data from tls_connection_init()
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* @verify_peer: 1 = verify peer certificate
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*
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* Returns: 0 on success, -1 on failure
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*/
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int tls_connection_set_verify(void *tls_ctx, struct tls_connection *conn,
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int verify_peer);
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/**
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* tls_global_client_cert - Set client certificate for all TLS connections
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* @tls_ctx: TLS context data from tls_init()
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* @client_cert: File name for client certificate in PEM or DER format
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*
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* Returns: 0 on success, -1 on failure
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*/
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int tls_global_client_cert(void *tls_ctx, const char *client_cert);
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/**
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* tls_global_private_key - Set private key for all TLS connections
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* @tls_ctx: TLS context data from tls_init()
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* @private_key: File name for client private key in PEM or DER format
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* @private_key_passwd: Passphrase for decrypted private key, %NULL if no
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* passphrase is used.
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*
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* Returns: 0 on success, -1 on failure
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*/
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int tls_global_private_key(void *tls_ctx, const char *private_key,
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const char *private_key_passwd);
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/**
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* tls_connection_get_keys - Get master key and random data from TLS connection
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* @tls_ctx: TLS context data from tls_init()
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* @conn: Connection context data from tls_connection_init()
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* @keys: Structure of key/random data (filled on success)
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*
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* Returns: 0 on success, -1 on failure
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*/
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int tls_connection_get_keys(void *tls_ctx, struct tls_connection *conn,
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struct tls_keys *keys);
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/**
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* tls_connection_handshake - Process TLS handshake (client side)
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* @tls_ctx: TLS context data from tls_init()
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* @conn: Connection context data from tls_connection_init()
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* @in_data: Input data from TLS peer
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* @in_len: Input data length
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* @out_len: Length of the output buffer.
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*
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* Returns: Pointer to output data, %NULL on failure
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*
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* Caller is responsible for freeing returned output data.
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*
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* This function is used during TLS handshake. The first call is done with
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* in_data == %NULL and the library is expected to return ClientHello packet.
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* This packet is then send to the server and a response from server is given
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* to TLS library by calling this function again with in_data pointing to the
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* TLS message from the server.
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*
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* If the TLS handshake fails, this function may return %NULL. However, if the
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* TLS library has a TLS alert to send out, that should be returned as the
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* output data. In this case, tls_connection_get_failed() must return failure
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* (> 0).
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*
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* tls_connection_established() should return 1 once the TLS handshake has been
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* completed successfully.
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*/
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u8 * tls_connection_handshake(void *tls_ctx, struct tls_connection *conn,
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const u8 *in_data, size_t in_len,
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size_t *out_len);
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/**
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* tls_connection_server_handshake - Process TLS handshake (server side)
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* @tls_ctx: TLS context data from tls_init()
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* @conn: Connection context data from tls_connection_init()
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* @in_data: Input data from TLS peer
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* @in_len: Input data length
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* @out_len: Length of the output buffer.
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*
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* Returns: pointer to output data, %NULL on failure
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*
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* Caller is responsible for freeing returned output data.
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*/
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u8 * tls_connection_server_handshake(void *tls_ctx,
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struct tls_connection *conn,
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const u8 *in_data, size_t in_len,
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size_t *out_len);
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/**
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* tls_connection_encrypt - Encrypt data into TLS tunnel
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* @tls_ctx: TLS context data from tls_init()
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* @conn: Connection context data from tls_connection_init()
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* @in_data: Pointer to plaintext data to be encrypted
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* @in_len: Input buffer length
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* @out_data: Pointer to output buffer (encrypted TLS data)
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* @out_len: Maximum out_data length
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*
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* Returns: Number of bytes written to out_data, -1 on failure
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*
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* This function is used after TLS handshake has been completed successfully to
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* send data in the encrypted tunnel.
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*/
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int tls_connection_encrypt(void *tls_ctx, struct tls_connection *conn,
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const u8 *in_data, size_t in_len,
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u8 *out_data, size_t out_len);
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/**
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* tls_connection_decrypt - Decrypt data from TLS tunnel
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* @tls_ctx: TLS context data from tls_init()
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* @conn: Connection context data from tls_connection_init()
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* @in_data: Pointer to input buffer (encrypted TLS data)
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* @in_len: Input buffer length
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* @out_data: Pointer to output buffer (decrypted data from TLS tunnel)
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* @out_len: Maximum out_data length
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*
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* Returns: Number of bytes written to out_data, -1 on failure
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*
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* This function is used after TLS handshake has been completed successfully to
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* receive data from the encrypted tunnel.
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*/
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int tls_connection_decrypt(void *tls_ctx, struct tls_connection *conn,
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const u8 *in_data, size_t in_len,
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u8 *out_data, size_t out_len);
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/**
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* tls_connection_resumed - Was session resumption used
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* @tls_ctx: TLS context data from tls_init()
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* @conn: Connection context data from tls_connection_init()
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*
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* Returns: 1 if current session used session resumption, 0 if not
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*/
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int tls_connection_resumed(void *tls_ctx, struct tls_connection *conn);
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/**
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* tls_connection_set_master_key - Configure master secret for TLS connection
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* @tls_ctx: TLS context data from tls_init()
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* @conn: Connection context data from tls_connection_init()
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* @key: TLS pre-master-secret
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* @key_len: length of key in bytes
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*
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* Returns: 0 on success, -1 on failure
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*/
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int tls_connection_set_master_key(void *tls_ctx, struct tls_connection *conn,
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const u8 *key, size_t key_len);
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/**
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* tls_connection_set_anon_dh - Configure TLS connection to use anonymous DH
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* @tls_ctx: TLS context data from tls_init()
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* @conn: Connection context data from tls_connection_init()
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*
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* Returns: 0 on success, -1 on failure
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*
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* TODO: consider changing this to more generic routine for configuring allowed
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* ciphers
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*/
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int tls_connection_set_anon_dh(void *tls_ctx, struct tls_connection *conn);
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/**
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* tls_get_cipher - Get current cipher name
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* @tls_ctx: TLS context data from tls_init()
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* @conn: Connection context data from tls_connection_init()
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* @buf: Buffer for the cipher name
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* @buflen: buf size
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*
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* Returns: 0 on success, -1 on failure
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*
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* Get the name of the currently used cipher.
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*/
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int tls_get_cipher(void *tls_ctx, struct tls_connection *conn,
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char *buf, size_t buflen);
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/**
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* tls_connection_enable_workaround - Enable TLS workaround options
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* @tls_ctx: TLS context data from tls_init()
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* @conn: Connection context data from tls_connection_init()
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*
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* Returns: 0 on success, -1 on failure
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*
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* This function is used to enable connection-specific workaround options for
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* buffer SSL/TLS implementations.
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*/
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int tls_connection_enable_workaround(void *tls_ctx,
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struct tls_connection *conn);
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/**
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* tls_connection_client_hello_ext - Set TLS extension for ClientHello
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* @tls_ctx: TLS context data from tls_init()
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* @conn: Connection context data from tls_connection_init()
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* @ext_type: Extension type
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* @data: Extension payload (NULL to remove extension)
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* @data_len: Extension payload length
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*
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* Returns: 0 on success, -1 on failure
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*/
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int tls_connection_client_hello_ext(void *tls_ctx, struct tls_connection *conn,
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int ext_type, const u8 *data,
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size_t data_len);
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/**
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* tls_connection_get_failed - Get connection failure status
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* @tls_ctx: TLS context data from tls_init()
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* @conn: Connection context data from tls_connection_init()
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*
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* Returns >0 if connection has failed, 0 if not.
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*/
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int tls_connection_get_failed(void *tls_ctx, struct tls_connection *conn);
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/**
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* tls_connection_get_read_alerts - Get connection read alert status
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* @tls_ctx: TLS context data from tls_init()
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* @conn: Connection context data from tls_connection_init()
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*
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* Returns: Number of times a fatal read (remote end reported error) has
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* happened during this connection.
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*/
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int tls_connection_get_read_alerts(void *tls_ctx, struct tls_connection *conn);
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/**
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* tls_connection_get_write_alerts - Get connection write alert status
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* @tls_ctx: TLS context data from tls_init()
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* @conn: Connection context data from tls_connection_init()
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*
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* Returns: Number of times a fatal write (locally detected error) has happened
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* during this connection.
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*/
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int tls_connection_get_write_alerts(void *tls_ctx,
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struct tls_connection *conn);
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/**
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* tls_connection_get_keyblock_size - Get TLS key_block size
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* @tls_ctx: TLS context data from tls_init()
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* @conn: Connection context data from tls_connection_init()
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* Returns: Size of the key_block for the negotiated cipher suite or -1 on
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* failure
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*/
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int tls_connection_get_keyblock_size(void *tls_ctx,
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struct tls_connection *conn);
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#endif /* TLS_H */
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