324 lines
11 KiB
C
324 lines
11 KiB
C
/*
|
|
* 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 */
|