freebsd-dev/contrib/hostapd/tls.h
2006-03-07 05:47:04 +00:00

464 lines
16 KiB
C

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