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qemu/include/crypto/tlssession.h
Daniel P. Berrangé 133cf1e5b1 crypto: define cleanup functions for use with g_autoptr 
Allow crypto structs to be used with g_autoptr, avoiding the need to
explicitly call XXX_free() functions when variables go out of scope on
the stack.

Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
2019-08-22 10:47:12 +01:00

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/*
* QEMU crypto TLS session support
*
* Copyright (c) 2015 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*
*/
#ifndef QCRYPTO_TLSSESSION_H
#define QCRYPTO_TLSSESSION_H
#include "crypto/tlscreds.h"
/**
* QCryptoTLSSession:
*
* The QCryptoTLSSession object encapsulates the
* logic to integrate with a TLS providing library such
* as GNUTLS, to setup and run TLS sessions.
*
* The API is designed such that it has no assumption about
* the type of transport it is running over. It may be a
* traditional TCP socket, or something else entirely. The
* only requirement is a full-duplex stream of some kind.
*
* <example>
* <title>Using TLS session objects</title>
* <programlisting>
* static ssize_t mysock_send(const char *buf, size_t len,
* void *opaque)
* {
* int fd = GPOINTER_TO_INT(opaque);
*
* return write(*fd, buf, len);
* }
*
* static ssize_t mysock_recv(const char *buf, size_t len,
* void *opaque)
* {
* int fd = GPOINTER_TO_INT(opaque);
*
* return read(*fd, buf, len);
* }
*
* static int mysock_run_tls(int sockfd,
* QCryptoTLSCreds *creds,
* Error *errp)
* {
* QCryptoTLSSession *sess;
*
* sess = qcrypto_tls_session_new(creds,
* "vnc.example.com",
* NULL,
* QCRYPTO_TLS_CREDS_ENDPOINT_CLIENT,
* errp);
* if (sess == NULL) {
* return -1;
* }
*
* qcrypto_tls_session_set_callbacks(sess,
* mysock_send,
* mysock_recv
* GINT_TO_POINTER(fd));
*
* while (1) {
* if (qcrypto_tls_session_handshake(sess, errp) < 0) {
* qcrypto_tls_session_free(sess);
* return -1;
* }
*
* switch(qcrypto_tls_session_get_handshake_status(sess)) {
* case QCRYPTO_TLS_HANDSHAKE_COMPLETE:
* if (qcrypto_tls_session_check_credentials(sess, errp) < )) {
* qcrypto_tls_session_free(sess);
* return -1;
* }
* goto done;
* case QCRYPTO_TLS_HANDSHAKE_RECVING:
* ...wait for GIO_IN event on fd...
* break;
* case QCRYPTO_TLS_HANDSHAKE_SENDING:
* ...wait for GIO_OUT event on fd...
* break;
* }
* }
* done:
*
* ....send/recv payload data on sess...
*
* qcrypto_tls_session_free(sess):
* }
* </programlisting>
* </example>
*/
typedef struct QCryptoTLSSession QCryptoTLSSession;
/**
* qcrypto_tls_session_new:
* @creds: pointer to a TLS credentials object
* @hostname: optional hostname to validate
* @aclname: optional ACL to validate peer credentials against
* @endpoint: role of the TLS session, client or server
* @errp: pointer to a NULL-initialized error object
*
* Create a new TLS session object that will be used to
* negotiate a TLS session over an arbitrary data channel.
* The session object can operate as either the server or
* client, according to the value of the @endpoint argument.
*
* For clients, the @hostname parameter should hold the full
* unmodified hostname as requested by the user. This will
* be used to verify the against the hostname reported in
* the server's credentials (aka x509 certificate).
*
* The @aclname parameter (optionally) specifies the name
* of an access control list that will be used to validate
* the peer's credentials. For x509 credentials, the ACL
* will be matched against the CommonName shown in the peer's
* certificate. If the session is acting as a server, setting
* an ACL will require that the client provide a validate
* x509 client certificate.
*
* After creating the session object, the I/O callbacks
* must be set using the qcrypto_tls_session_set_callbacks()
* method. A TLS handshake sequence must then be completed
* using qcrypto_tls_session_handshake(), before payload
* data is permitted to be sent/received.
*
* The session object must be released by calling
* qcrypto_tls_session_free() when no longer required
*
* Returns: a TLS session object, or NULL on error.
*/
QCryptoTLSSession *qcrypto_tls_session_new(QCryptoTLSCreds *creds,
const char *hostname,
const char *aclname,
QCryptoTLSCredsEndpoint endpoint,
Error **errp);
/**
* qcrypto_tls_session_free:
* @sess: the TLS session object
*
* Release all memory associated with the TLS session
* object previously allocated by qcrypto_tls_session_new()
*/
void qcrypto_tls_session_free(QCryptoTLSSession *sess);
G_DEFINE_AUTOPTR_CLEANUP_FUNC(QCryptoTLSSession, qcrypto_tls_session_free)
/**
* qcrypto_tls_session_check_credentials:
* @sess: the TLS session object
* @errp: pointer to a NULL-initialized error object
*
* Validate the peer's credentials after a successful
* TLS handshake. It is an error to call this before
* qcrypto_tls_session_get_handshake_status() returns
* QCRYPTO_TLS_HANDSHAKE_COMPLETE
*
* Returns 0 if the credentials validated, -1 on error
*/
int qcrypto_tls_session_check_credentials(QCryptoTLSSession *sess,
Error **errp);
typedef ssize_t (*QCryptoTLSSessionWriteFunc)(const char *buf,
size_t len,
void *opaque);
typedef ssize_t (*QCryptoTLSSessionReadFunc)(char *buf,
size_t len,
void *opaque);
/**
* qcrypto_tls_session_set_callbacks:
* @sess: the TLS session object
* @writeFunc: callback for sending data
* @readFunc: callback to receiving data
* @opaque: data to pass to callbacks
*
* Sets the callback functions that are to be used for sending
* and receiving data on the underlying data channel. Typically
* the callbacks to write/read to/from a TCP socket, but there
* is no assumption made about the type of channel used.
*
* The @writeFunc callback will be passed the encrypted
* data to send to the remote peer.
*
* The @readFunc callback will be passed a pointer to fill
* with encrypted data received from the remote peer
*/
void qcrypto_tls_session_set_callbacks(QCryptoTLSSession *sess,
QCryptoTLSSessionWriteFunc writeFunc,
QCryptoTLSSessionReadFunc readFunc,
void *opaque);
/**
* qcrypto_tls_session_write:
* @sess: the TLS session object
* @buf: the plain text to send
* @len: the length of @buf
*
* Encrypt @len bytes of the data in @buf and send
* it to the remote peer using the callback previously
* registered with qcrypto_tls_session_set_callbacks()
*
* It is an error to call this before
* qcrypto_tls_session_get_handshake_status() returns
* QCRYPTO_TLS_HANDSHAKE_COMPLETE
*
* Returns: the number of bytes sent, or -1 on error
*/
ssize_t qcrypto_tls_session_write(QCryptoTLSSession *sess,
const char *buf,
size_t len);
/**
* qcrypto_tls_session_read:
* @sess: the TLS session object
* @buf: to fill with plain text received
* @len: the length of @buf
*
* Receive up to @len bytes of data from the remote peer
* using the callback previously registered with
* qcrypto_tls_session_set_callbacks(), decrypt it and
* store it in @buf.
*
* It is an error to call this before
* qcrypto_tls_session_get_handshake_status() returns
* QCRYPTO_TLS_HANDSHAKE_COMPLETE
*
* Returns: the number of bytes received, or -1 on error
*/
ssize_t qcrypto_tls_session_read(QCryptoTLSSession *sess,
char *buf,
size_t len);
/**
* qcrypto_tls_session_handshake:
* @sess: the TLS session object
* @errp: pointer to a NULL-initialized error object
*
* Start, or continue, a TLS handshake sequence. If
* the underlying data channel is non-blocking, then
* this method may return control before the handshake
* is complete. On non-blocking channels the
* qcrypto_tls_session_get_handshake_status() method
* should be used to determine whether the handshake
* has completed, or is waiting to send or receive
* data. In the latter cases, the caller should setup
* an event loop watch and call this method again
* once the underlying data channel is ready to read
* or write again
*/
int qcrypto_tls_session_handshake(QCryptoTLSSession *sess,
Error **errp);
typedef enum {
QCRYPTO_TLS_HANDSHAKE_COMPLETE,
QCRYPTO_TLS_HANDSHAKE_SENDING,
QCRYPTO_TLS_HANDSHAKE_RECVING,
} QCryptoTLSSessionHandshakeStatus;
/**
* qcrypto_tls_session_get_handshake_status:
* @sess: the TLS session object
*
* Check the status of the TLS handshake. This
* is used with non-blocking data channels to
* determine whether the handshake is waiting
* to send or receive further data to/from the
* remote peer.
*
* Once this returns QCRYPTO_TLS_HANDSHAKE_COMPLETE
* it is permitted to send/receive payload data on
* the channel
*/
QCryptoTLSSessionHandshakeStatus
qcrypto_tls_session_get_handshake_status(QCryptoTLSSession *sess);
/**
* qcrypto_tls_session_get_key_size:
* @sess: the TLS session object
* @errp: pointer to a NULL-initialized error object
*
* Check the size of the data channel encryption key
*
* Returns: the length in bytes of the encryption key
* or -1 on error
*/
int qcrypto_tls_session_get_key_size(QCryptoTLSSession *sess,
Error **errp);
/**
* qcrypto_tls_session_get_peer_name:
* @sess: the TLS session object
*
* Get the identified name of the remote peer. If the
* TLS session was negotiated using x509 certificate
* credentials, this will return the CommonName from
* the peer's certificate. If no identified name is
* available it will return NULL.
*
* The returned data must be released with g_free()
* when no longer required.
*
* Returns: the peer's name or NULL.
*/
char *qcrypto_tls_session_get_peer_name(QCryptoTLSSession *sess);
#endif /* QCRYPTO_TLSSESSION_H */
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