[qemu.git] / crypto / tlssession.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 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/>.
 *
 */

#include "qemu/osdep.h"
#include "crypto/tlssession.h"
#include "crypto/tlscredsanon.h"
#include "crypto/tlscredsx509.h"
#include "qapi/error.h"
#include "qemu/acl.h"
#include "trace.h"

#ifdef CONFIG_GNUTLS


#include <gnutls/x509.h>


struct QCryptoTLSSession {
    QCryptoTLSCreds *creds;
    gnutls_session_t handle;
    char *hostname;
    char *aclname;
    bool handshakeComplete;
    QCryptoTLSSessionWriteFunc writeFunc;
    QCryptoTLSSessionReadFunc readFunc;
    void *opaque;
    char *peername;
};


void
qcrypto_tls_session_free(QCryptoTLSSession *session)
{
    if (!session) {
        return;
    }

    gnutls_deinit(session->handle);
    g_free(session->hostname);
    g_free(session->peername);
    g_free(session->aclname);
    object_unref(OBJECT(session->creds));
    g_free(session);
}


static ssize_t
qcrypto_tls_session_push(void *opaque, const void *buf, size_t len)
{
    QCryptoTLSSession *session = opaque;

    if (!session->writeFunc) {
        errno = EIO;
        return -1;
    };

    return session->writeFunc(buf, len, session->opaque);
}


static ssize_t
qcrypto_tls_session_pull(void *opaque, void *buf, size_t len)
{
    QCryptoTLSSession *session = opaque;

    if (!session->readFunc) {
        errno = EIO;
        return -1;
    };

    return session->readFunc(buf, len, session->opaque);
}


QCryptoTLSSession *
qcrypto_tls_session_new(QCryptoTLSCreds *creds,
                        const char *hostname,
                        const char *aclname,
                        QCryptoTLSCredsEndpoint endpoint,
                        Error **errp)
{
    QCryptoTLSSession *session;
    int ret;

    session = g_new0(QCryptoTLSSession, 1);
    trace_qcrypto_tls_session_new(
        session, creds, hostname ? hostname : "<none>",
        aclname ? aclname : "<none>", endpoint);

    if (hostname) {
        session->hostname = g_strdup(hostname);
    }
    if (aclname) {
        session->aclname = g_strdup(aclname);
    }
    session->creds = creds;
    object_ref(OBJECT(creds));

    if (creds->endpoint != endpoint) {
        error_setg(errp, "Credentials endpoint doesn't match session");
        goto error;
    }

    if (endpoint == QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) {
        ret = gnutls_init(&session->handle, GNUTLS_SERVER);
    } else {
        ret = gnutls_init(&session->handle, GNUTLS_CLIENT);
    }
    if (ret < 0) {
        error_setg(errp, "Cannot initialize TLS session: %s",
                   gnutls_strerror(ret));
        goto error;
    }

    if (object_dynamic_cast(OBJECT(creds),
                            TYPE_QCRYPTO_TLS_CREDS_ANON)) {
        QCryptoTLSCredsAnon *acreds = QCRYPTO_TLS_CREDS_ANON(creds);

        ret = gnutls_priority_set_direct(session->handle,
                                         "NORMAL:+ANON-DH", NULL);
        if (ret < 0) {
            error_setg(errp, "Unable to set TLS session priority: %s",
                       gnutls_strerror(ret));
            goto error;
        }
        if (creds->endpoint == QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) {
            ret = gnutls_credentials_set(session->handle,
                                         GNUTLS_CRD_ANON,
                                         acreds->data.server);
        } else {
            ret = gnutls_credentials_set(session->handle,
                                         GNUTLS_CRD_ANON,
                                         acreds->data.client);
        }
        if (ret < 0) {
            error_setg(errp, "Cannot set session credentials: %s",
                       gnutls_strerror(ret));
            goto error;
        }
    } else if (object_dynamic_cast(OBJECT(creds),
                                   TYPE_QCRYPTO_TLS_CREDS_X509)) {
        QCryptoTLSCredsX509 *tcreds = QCRYPTO_TLS_CREDS_X509(creds);

        ret = gnutls_set_default_priority(session->handle);
        if (ret < 0) {
            error_setg(errp, "Cannot set default TLS session priority: %s",
                       gnutls_strerror(ret));
            goto error;
        }
        ret = gnutls_credentials_set(session->handle,
                                     GNUTLS_CRD_CERTIFICATE,
                                     tcreds->data);
        if (ret < 0) {
            error_setg(errp, "Cannot set session credentials: %s",
                       gnutls_strerror(ret));
            goto error;
        }

        if (creds->endpoint == QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) {
            /* This requests, but does not enforce a client cert.
             * The cert checking code later does enforcement */
            gnutls_certificate_server_set_request(session->handle,
                                                  GNUTLS_CERT_REQUEST);
        }
    } else {
        error_setg(errp, "Unsupported TLS credentials type %s",
                   object_get_typename(OBJECT(creds)));
        goto error;
    }

    gnutls_transport_set_ptr(session->handle, session);
    gnutls_transport_set_push_function(session->handle,
                                       qcrypto_tls_session_push);
    gnutls_transport_set_pull_function(session->handle,
                                       qcrypto_tls_session_pull);

    return session;

 error:
    qcrypto_tls_session_free(session);
    return NULL;
}

static int
qcrypto_tls_session_check_certificate(QCryptoTLSSession *session,
                                      Error **errp)
{
    int ret;
    unsigned int status;
    const gnutls_datum_t *certs;
    unsigned int nCerts, i;
    time_t now;
    gnutls_x509_crt_t cert = NULL;

    now = time(NULL);
    if (now == ((time_t)-1)) {
        error_setg_errno(errp, errno, "Cannot get current time");
        return -1;
    }

    ret = gnutls_certificate_verify_peers2(session->handle, &status);
    if (ret < 0) {
        error_setg(errp, "Verify failed: %s", gnutls_strerror(ret));
        return -1;
    }

    if (status != 0) {
        const char *reason = "Invalid certificate";

        if (status & GNUTLS_CERT_INVALID) {
            reason = "The certificate is not trusted";
        }

        if (status & GNUTLS_CERT_SIGNER_NOT_FOUND) {
            reason = "The certificate hasn't got a known issuer";
        }

        if (status & GNUTLS_CERT_REVOKED) {
            reason = "The certificate has been revoked";
        }

        if (status & GNUTLS_CERT_INSECURE_ALGORITHM) {
            reason = "The certificate uses an insecure algorithm";
        }

        error_setg(errp, "%s", reason);
        return -1;
    }

    certs = gnutls_certificate_get_peers(session->handle, &nCerts);
    if (!certs) {
        error_setg(errp, "No certificate peers");
        return -1;
    }

    for (i = 0; i < nCerts; i++) {
        ret = gnutls_x509_crt_init(&cert);
        if (ret < 0) {
            error_setg(errp, "Cannot initialize certificate: %s",
                       gnutls_strerror(ret));
            return -1;
        }

        ret = gnutls_x509_crt_import(cert, &certs[i], GNUTLS_X509_FMT_DER);
        if (ret < 0) {
            error_setg(errp, "Cannot import certificate: %s",
                       gnutls_strerror(ret));
            goto error;
        }

        if (gnutls_x509_crt_get_expiration_time(cert) < now) {
            error_setg(errp, "The certificate has expired");
            goto error;
        }

        if (gnutls_x509_crt_get_activation_time(cert) > now) {
            error_setg(errp, "The certificate is not yet activated");
            goto error;
        }

        if (gnutls_x509_crt_get_activation_time(cert) > now) {
            error_setg(errp, "The certificate is not yet activated");
            goto error;
        }

        if (i == 0) {
            size_t dnameSize = 1024;
            session->peername = g_malloc(dnameSize);
        requery:
            ret = gnutls_x509_crt_get_dn(cert, session->peername, &dnameSize);
            if (ret < 0) {
                if (ret == GNUTLS_E_SHORT_MEMORY_BUFFER) {
                    session->peername = g_realloc(session->peername,
                                                  dnameSize);
                    goto requery;
                }
                error_setg(errp, "Cannot get client distinguished name: %s",
                           gnutls_strerror(ret));
                goto error;
            }
            if (session->aclname) {
                qemu_acl *acl = qemu_acl_find(session->aclname);
                int allow;
                if (!acl) {
                    error_setg(errp, "Cannot find ACL %s",
                               session->aclname);
                    goto error;
                }

                allow = qemu_acl_party_is_allowed(acl, session->peername);

                if (!allow) {
                    error_setg(errp, "TLS x509 ACL check for %s is denied",
                               session->peername);
                    goto error;
                }
            }
            if (session->hostname) {
                if (!gnutls_x509_crt_check_hostname(cert, session->hostname)) {
                    error_setg(errp,
                               "Certificate does not match the hostname %s",
                               session->hostname);
                    goto error;
                }
            }
        }

        gnutls_x509_crt_deinit(cert);
    }

    return 0;

 error:
    gnutls_x509_crt_deinit(cert);
    return -1;
}


int
qcrypto_tls_session_check_credentials(QCryptoTLSSession *session,
                                      Error **errp)
{
    if (object_dynamic_cast(OBJECT(session->creds),
                            TYPE_QCRYPTO_TLS_CREDS_ANON)) {
        return 0;
    } else if (object_dynamic_cast(OBJECT(session->creds),
                            TYPE_QCRYPTO_TLS_CREDS_X509)) {
        if (session->creds->verifyPeer) {
            return qcrypto_tls_session_check_certificate(session,
                                                         errp);
        } else {
            return 0;
        }
    } else {
        error_setg(errp, "Unexpected credential type %s",
                   object_get_typename(OBJECT(session->creds)));
        return -1;
    }
}


void
qcrypto_tls_session_set_callbacks(QCryptoTLSSession *session,
                                  QCryptoTLSSessionWriteFunc writeFunc,
                                  QCryptoTLSSessionReadFunc readFunc,
                                  void *opaque)
{
    session->writeFunc = writeFunc;
    session->readFunc = readFunc;
    session->opaque = opaque;
}


ssize_t
qcrypto_tls_session_write(QCryptoTLSSession *session,
                          const char *buf,
                          size_t len)
{
    ssize_t ret = gnutls_record_send(session->handle, buf, len);

    if (ret < 0) {
        switch (ret) {
        case GNUTLS_E_AGAIN:
            errno = EAGAIN;
            break;
        case GNUTLS_E_INTERRUPTED:
            errno = EINTR;
            break;
        default:
            errno = EIO;
            break;
        }
        ret = -1;
    }

    return ret;
}


ssize_t
qcrypto_tls_session_read(QCryptoTLSSession *session,
                         char *buf,
                         size_t len)
{
    ssize_t ret = gnutls_record_recv(session->handle, buf, len);

    if (ret < 0) {
        switch (ret) {
        case GNUTLS_E_AGAIN:
            errno = EAGAIN;
            break;
        case GNUTLS_E_INTERRUPTED:
            errno = EINTR;
            break;
        default:
            errno = EIO;
            break;
        }
        ret = -1;
    }

    return ret;
}


int
qcrypto_tls_session_handshake(QCryptoTLSSession *session,
                              Error **errp)
{
    int ret = gnutls_handshake(session->handle);
    if (ret == 0) {
        session->handshakeComplete = true;
    } else {
        if (ret == GNUTLS_E_INTERRUPTED ||
            ret == GNUTLS_E_AGAIN) {
            ret = 1;
        } else {
            error_setg(errp, "TLS handshake failed: %s",
                       gnutls_strerror(ret));
            ret = -1;
        }
    }

    return ret;
}


QCryptoTLSSessionHandshakeStatus
qcrypto_tls_session_get_handshake_status(QCryptoTLSSession *session)
{
    if (session->handshakeComplete) {
        return QCRYPTO_TLS_HANDSHAKE_COMPLETE;
    } else if (gnutls_record_get_direction(session->handle) == 0) {
        return QCRYPTO_TLS_HANDSHAKE_RECVING;
    } else {
        return QCRYPTO_TLS_HANDSHAKE_SENDING;
    }
}


int
qcrypto_tls_session_get_key_size(QCryptoTLSSession *session,
                                 Error **errp)
{
    gnutls_cipher_algorithm_t cipher;
    int ssf;

    cipher = gnutls_cipher_get(session->handle);
    ssf = gnutls_cipher_get_key_size(cipher);
    if (!ssf) {
        error_setg(errp, "Cannot get TLS cipher key size");
        return -1;
    }
    return ssf;
}


char *
qcrypto_tls_session_get_peer_name(QCryptoTLSSession *session)
{
    if (session->peername) {
        return g_strdup(session->peername);
    }
    return NULL;
}


#else /* ! CONFIG_GNUTLS */


QCryptoTLSSession *
qcrypto_tls_session_new(QCryptoTLSCreds *creds G_GNUC_UNUSED,
                        const char *hostname G_GNUC_UNUSED,
                        const char *aclname G_GNUC_UNUSED,
                        QCryptoTLSCredsEndpoint endpoint G_GNUC_UNUSED,
                        Error **errp)
{
    error_setg(errp, "TLS requires GNUTLS support");
    return NULL;
}


void
qcrypto_tls_session_free(QCryptoTLSSession *sess G_GNUC_UNUSED)
{
}


int
qcrypto_tls_session_check_credentials(QCryptoTLSSession *sess G_GNUC_UNUSED,
                                      Error **errp)
{
    error_setg(errp, "TLS requires GNUTLS support");
    return -1;
}


void
qcrypto_tls_session_set_callbacks(
    QCryptoTLSSession *sess G_GNUC_UNUSED,
    QCryptoTLSSessionWriteFunc writeFunc G_GNUC_UNUSED,
    QCryptoTLSSessionReadFunc readFunc G_GNUC_UNUSED,
    void *opaque G_GNUC_UNUSED)
{
}


ssize_t
qcrypto_tls_session_write(QCryptoTLSSession *sess,
                          const char *buf,
                          size_t len)
{
    errno = -EIO;
    return -1;
}


ssize_t
qcrypto_tls_session_read(QCryptoTLSSession *sess,
                         char *buf,
                         size_t len)
{
    errno = -EIO;
    return -1;
}


int
qcrypto_tls_session_handshake(QCryptoTLSSession *sess,
                              Error **errp)
{
    error_setg(errp, "TLS requires GNUTLS support");
    return -1;
}


QCryptoTLSSessionHandshakeStatus
qcrypto_tls_session_get_handshake_status(QCryptoTLSSession *sess)
{
    return QCRYPTO_TLS_HANDSHAKE_COMPLETE;
}


int
qcrypto_tls_session_get_key_size(QCryptoTLSSession *sess,
                                 Error **errp)
{
    error_setg(errp, "TLS requires GNUTLS support");
    return -1;
}


char *
qcrypto_tls_session_get_peer_name(QCryptoTLSSession *sess)
{
    return NULL;
}

#endif
Commit	Line	Data
d321e1e5 DB	1	/*
	2	* QEMU crypto TLS session support
	3	*
	4	* Copyright (c) 2015 Red Hat, Inc.
	5	*
	6	* This library is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU Lesser General Public
	8	* License as published by the Free Software Foundation; either
	9	* version 2 of the License, or (at your option) any later version.
	10	*
	11	* This library is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	14	* Lesser General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU Lesser General Public
	17	* License along with this library; if not, see <http://www.gnu.org/licenses/>.
	18	*
	19	*/
	20
42f7a448	21	#include "qemu/osdep.h"
d321e1e5 DB	22	#include "crypto/tlssession.h"
	23	#include "crypto/tlscredsanon.h"
	24	#include "crypto/tlscredsx509.h"
da34e65c	25	#include "qapi/error.h"
d321e1e5 DB	26	#include "qemu/acl.h"
	27	#include "trace.h"
	28
	29	#ifdef CONFIG_GNUTLS
	30
	31
	32	#include <gnutls/x509.h>
	33
	34
	35	struct QCryptoTLSSession {
	36	QCryptoTLSCreds *creds;
	37	gnutls_session_t handle;
	38	char *hostname;
	39	char *aclname;
	40	bool handshakeComplete;
	41	QCryptoTLSSessionWriteFunc writeFunc;
	42	QCryptoTLSSessionReadFunc readFunc;
	43	void *opaque;
	44	char *peername;
	45	};
	46
	47
	48	void
	49	qcrypto_tls_session_free(QCryptoTLSSession *session)
	50	{
	51	if (!session) {
	52	return;
	53	}
	54
	55	gnutls_deinit(session->handle);
	56	g_free(session->hostname);
	57	g_free(session->peername);
	58	g_free(session->aclname);
	59	object_unref(OBJECT(session->creds));
	60	g_free(session);
	61	}
	62
	63
	64	static ssize_t
	65	qcrypto_tls_session_push(void opaque, const void buf, size_t len)
	66	{
	67	QCryptoTLSSession *session = opaque;
	68
	69	if (!session->writeFunc) {
	70	errno = EIO;
	71	return -1;
	72	};
	73
	74	return session->writeFunc(buf, len, session->opaque);
	75	}
	76
	77
	78	static ssize_t
	79	qcrypto_tls_session_pull(void opaque, void buf, size_t len)
	80	{
	81	QCryptoTLSSession *session = opaque;
	82
	83	if (!session->readFunc) {
	84	errno = EIO;
	85	return -1;
	86	};
	87
	88	return session->readFunc(buf, len, session->opaque);
	89	}
90
91
92	QCryptoTLSSession *
93	qcrypto_tls_session_new(QCryptoTLSCreds *creds,
94	const char *hostname,
95	const char *aclname,
96	QCryptoTLSCredsEndpoint endpoint,
97	Error **errp)
98	{
99	QCryptoTLSSession *session;
100	int ret;
101
102	session = g_new0(QCryptoTLSSession, 1);
103	trace_qcrypto_tls_session_new(
104	session, creds, hostname ? hostname : "<none>",
105	aclname ? aclname : "<none>", endpoint);
106
107	if (hostname) {
108	session->hostname = g_strdup(hostname);
109	}
110	if (aclname) {
111	session->aclname = g_strdup(aclname);
112	}
113	session->creds = creds;
114	object_ref(OBJECT(creds));
115
116	if (creds->endpoint != endpoint) {
117	error_setg(errp, "Credentials endpoint doesn't match session");
118	goto error;
119	}
120
121	if (endpoint == QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) {
122	ret = gnutls_init(&session->handle, GNUTLS_SERVER);
123	} else {
124	ret = gnutls_init(&session->handle, GNUTLS_CLIENT);
125	}
126	if (ret < 0) {
127	error_setg(errp, "Cannot initialize TLS session: %s",
128	gnutls_strerror(ret));
129	goto error;
130	}
131
132	if (object_dynamic_cast(OBJECT(creds),
133	TYPE_QCRYPTO_TLS_CREDS_ANON)) {
134	QCryptoTLSCredsAnon *acreds = QCRYPTO_TLS_CREDS_ANON(creds);
135
136	ret = gnutls_priority_set_direct(session->handle,
137	"NORMAL:+ANON-DH", NULL);
138	if (ret < 0) {
139	error_setg(errp, "Unable to set TLS session priority: %s",
140	gnutls_strerror(ret));
141	goto error;
142	}
143	if (creds->endpoint == QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) {
144	ret = gnutls_credentials_set(session->handle,
145	GNUTLS_CRD_ANON,
146	acreds->data.server);
147	} else {
148	ret = gnutls_credentials_set(session->handle,
149	GNUTLS_CRD_ANON,
150	acreds->data.client);
151	}
152	if (ret < 0) {
153	error_setg(errp, "Cannot set session credentials: %s",
154	gnutls_strerror(ret));
155	goto error;
156	}
157	} else if (object_dynamic_cast(OBJECT(creds),
158	TYPE_QCRYPTO_TLS_CREDS_X509)) {
159	QCryptoTLSCredsX509 *tcreds = QCRYPTO_TLS_CREDS_X509(creds);
160
161	ret = gnutls_set_default_priority(session->handle);
162	if (ret < 0) {
163	error_setg(errp, "Cannot set default TLS session priority: %s",
164	gnutls_strerror(ret));
165	goto error;
166	}
167	ret = gnutls_credentials_set(session->handle,
168	GNUTLS_CRD_CERTIFICATE,
169	tcreds->data);
170	if (ret < 0) {
171	error_setg(errp, "Cannot set session credentials: %s",
172	gnutls_strerror(ret));
173	goto error;
174	}
175
176	if (creds->endpoint == QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) {
177	/* This requests, but does not enforce a client cert.
178	* The cert checking code later does enforcement */
179	gnutls_certificate_server_set_request(session->handle,
180	GNUTLS_CERT_REQUEST);
181	}
182	} else {
183	error_setg(errp, "Unsupported TLS credentials type %s",
184	object_get_typename(OBJECT(creds)));
185	goto error;
186	}
187
188	gnutls_transport_set_ptr(session->handle, session);
189	gnutls_transport_set_push_function(session->handle,
190	qcrypto_tls_session_push);
191	gnutls_transport_set_pull_function(session->handle,
192	qcrypto_tls_session_pull);
193
194	return session;
195
196	error:
197	qcrypto_tls_session_free(session);
198	return NULL;
199	}
200
201	static int
202	qcrypto_tls_session_check_certificate(QCryptoTLSSession *session,
203	Error **errp)
204	{
205	int ret;
206	unsigned int status;
207	const gnutls_datum_t *certs;
208	unsigned int nCerts, i;
209	time_t now;
210	gnutls_x509_crt_t cert = NULL;
211
212	now = time(NULL);
213	if (now == ((time_t)-1)) {
214	error_setg_errno(errp, errno, "Cannot get current time");
215	return -1;
216	}
217
218	ret = gnutls_certificate_verify_peers2(session->handle, &status);
219	if (ret < 0) {
220	error_setg(errp, "Verify failed: %s", gnutls_strerror(ret));
221	return -1;
222	}
223
224	if (status != 0) {
225	const char *reason = "Invalid certificate";
226
227	if (status & GNUTLS_CERT_INVALID) {
228	reason = "The certificate is not trusted";
229	}
230
231	if (status & GNUTLS_CERT_SIGNER_NOT_FOUND) {
232	reason = "The certificate hasn't got a known issuer";
233	}
234
235	if (status & GNUTLS_CERT_REVOKED) {
236	reason = "The certificate has been revoked";
237	}
238
239	if (status & GNUTLS_CERT_INSECURE_ALGORITHM) {
240	reason = "The certificate uses an insecure algorithm";
241	}
242
243	error_setg(errp, "%s", reason);
244	return -1;
245	}
246
247	certs = gnutls_certificate_get_peers(session->handle, &nCerts);
248	if (!certs) {
249	error_setg(errp, "No certificate peers");
250	return -1;
251	}
252
253	for (i = 0; i < nCerts; i++) {
254	ret = gnutls_x509_crt_init(&cert);
255	if (ret < 0) {
256	error_setg(errp, "Cannot initialize certificate: %s",
257	gnutls_strerror(ret));
258	return -1;
259	}
260
261	ret = gnutls_x509_crt_import(cert, &certs[i], GNUTLS_X509_FMT_DER);
262	if (ret < 0) {
263	error_setg(errp, "Cannot import certificate: %s",
264	gnutls_strerror(ret));
265	goto error;
266	}
267
268	if (gnutls_x509_crt_get_expiration_time(cert) < now) {
269	error_setg(errp, "The certificate has expired");
270	goto error;
271	}
272
273	if (gnutls_x509_crt_get_activation_time(cert) > now) {
274	error_setg(errp, "The certificate is not yet activated");
275	goto error;
276	}
277
278	if (gnutls_x509_crt_get_activation_time(cert) > now) {
279	error_setg(errp, "The certificate is not yet activated");
280	goto error;
281	}
282
283	if (i == 0) {
284	size_t dnameSize = 1024;
285	session->peername = g_malloc(dnameSize);
286	requery:
287	ret = gnutls_x509_crt_get_dn(cert, session->peername, &dnameSize);
288	if (ret < 0) {
289	if (ret == GNUTLS_E_SHORT_MEMORY_BUFFER) {
290	session->peername = g_realloc(session->peername,
291	dnameSize);
292	goto requery;
293	}
294	error_setg(errp, "Cannot get client distinguished name: %s",
295	gnutls_strerror(ret));
296	goto error;
297	}
298	if (session->aclname) {
299	qemu_acl *acl = qemu_acl_find(session->aclname);
300	int allow;
301	if (!acl) {
302	error_setg(errp, "Cannot find ACL %s",
303	session->aclname);
304	goto error;
305	}
306
307	allow = qemu_acl_party_is_allowed(acl, session->peername);
308
d321e1e5	309	if (!allow) {
6ef8cd7a DB	310	error_setg(errp, "TLS x509 ACL check for %s is denied",
6ef8cd7a DB	311	session->peername);
d321e1e5 DB	312	goto error;
	313	}
	314	}
	315	if (session->hostname) {
	316	if (!gnutls_x509_crt_check_hostname(cert, session->hostname)) {
	317	error_setg(errp,
	318	"Certificate does not match the hostname %s",
	319	session->hostname);
	320	goto error;
	321	}
	322	}
	323	}
	324
	325	gnutls_x509_crt_deinit(cert);
	326	}
	327
	328	return 0;
	329
	330	error:
	331	gnutls_x509_crt_deinit(cert);
	332	return -1;
	333	}
	334
	335
	336	int
	337	qcrypto_tls_session_check_credentials(QCryptoTLSSession *session,
	338	Error **errp)
	339	{
	340	if (object_dynamic_cast(OBJECT(session->creds),
	341	TYPE_QCRYPTO_TLS_CREDS_ANON)) {
	342	return 0;
	343	} else if (object_dynamic_cast(OBJECT(session->creds),
	344	TYPE_QCRYPTO_TLS_CREDS_X509)) {
	345	if (session->creds->verifyPeer) {
	346	return qcrypto_tls_session_check_certificate(session,
	347	errp);
	348	} else {
	349	return 0;
	350	}
	351	} else {
	352	error_setg(errp, "Unexpected credential type %s",
	353	object_get_typename(OBJECT(session->creds)));
	354	return -1;
	355	}
	356	}
	357
	358
	359	void
	360	qcrypto_tls_session_set_callbacks(QCryptoTLSSession *session,
	361	QCryptoTLSSessionWriteFunc writeFunc,
	362	QCryptoTLSSessionReadFunc readFunc,
	363	void *opaque)
	364	{
	365	session->writeFunc = writeFunc;
	366	session->readFunc = readFunc;
	367	session->opaque = opaque;
	368	}
	369
	370
	371	ssize_t
	372	qcrypto_tls_session_write(QCryptoTLSSession *session,
	373	const char *buf,
	374	size_t len)
	375	{
376	ssize_t ret = gnutls_record_send(session->handle, buf, len);
377
378	if (ret < 0) {
379	switch (ret) {
380	case GNUTLS_E_AGAIN:
381	errno = EAGAIN;
382	break;
383	case GNUTLS_E_INTERRUPTED:
384	errno = EINTR;
385	break;
386	default:
387	errno = EIO;
388	break;
389	}
390	ret = -1;
391	}
392
393	return ret;
394	}
395
396
397	ssize_t
398	qcrypto_tls_session_read(QCryptoTLSSession *session,
399	char *buf,
400	size_t len)
401	{
402	ssize_t ret = gnutls_record_recv(session->handle, buf, len);
403
404	if (ret < 0) {
405	switch (ret) {
406	case GNUTLS_E_AGAIN:
407	errno = EAGAIN;
408	break;
409	case GNUTLS_E_INTERRUPTED:
410	errno = EINTR;
411	break;
412	default:
413	errno = EIO;
414	break;
415	}
416	ret = -1;
417	}
418
419	return ret;
420	}
421
422
423	int
424	qcrypto_tls_session_handshake(QCryptoTLSSession *session,
425	Error **errp)
426	{
427	int ret = gnutls_handshake(session->handle);
428	if (ret == 0) {
429	session->handshakeComplete = true;
430	} else {
431	if (ret == GNUTLS_E_INTERRUPTED \|\|
432	ret == GNUTLS_E_AGAIN) {
433	ret = 1;
434	} else {
435	error_setg(errp, "TLS handshake failed: %s",
436	gnutls_strerror(ret));
437	ret = -1;
438	}
439	}
440
441	return ret;
442	}
443
444
445	QCryptoTLSSessionHandshakeStatus
446	qcrypto_tls_session_get_handshake_status(QCryptoTLSSession *session)
447	{
448	if (session->handshakeComplete) {
449	return QCRYPTO_TLS_HANDSHAKE_COMPLETE;
450	} else if (gnutls_record_get_direction(session->handle) == 0) {
451	return QCRYPTO_TLS_HANDSHAKE_RECVING;
452	} else {
453	return QCRYPTO_TLS_HANDSHAKE_SENDING;
454	}
455	}
456
457
458	int
459	qcrypto_tls_session_get_key_size(QCryptoTLSSession *session,
460	Error **errp)
461	{
462	gnutls_cipher_algorithm_t cipher;
463	int ssf;
464
465	cipher = gnutls_cipher_get(session->handle);
466	ssf = gnutls_cipher_get_key_size(cipher);
467	if (!ssf) {
468	error_setg(errp, "Cannot get TLS cipher key size");
469	return -1;
470	}
471	return ssf;
472	}
473
474
475	char *
476	qcrypto_tls_session_get_peer_name(QCryptoTLSSession *session)
477	{
478	if (session->peername) {
479	return g_strdup(session->peername);
480	}
481	return NULL;
482	}
483
484
485	#else /* ! CONFIG_GNUTLS */
486
487
488	QCryptoTLSSession *
489	qcrypto_tls_session_new(QCryptoTLSCreds *creds G_GNUC_UNUSED,
490	const char *hostname G_GNUC_UNUSED,
491	const char *aclname G_GNUC_UNUSED,
492	QCryptoTLSCredsEndpoint endpoint G_GNUC_UNUSED,
493	Error **errp)
494	{
495	error_setg(errp, "TLS requires GNUTLS support");
496	return NULL;
497	}
498
499
500	void
501	qcrypto_tls_session_free(QCryptoTLSSession *sess G_GNUC_UNUSED)
502	{
503	}
504
505
506	int
507	qcrypto_tls_session_check_credentials(QCryptoTLSSession *sess G_GNUC_UNUSED,
508	Error **errp)
509	{
510	error_setg(errp, "TLS requires GNUTLS support");
511	return -1;
512	}
513
514
515	void
516	qcrypto_tls_session_set_callbacks(
517	QCryptoTLSSession *sess G_GNUC_UNUSED,
518	QCryptoTLSSessionWriteFunc writeFunc G_GNUC_UNUSED,
519	QCryptoTLSSessionReadFunc readFunc G_GNUC_UNUSED,
520	void *opaque G_GNUC_UNUSED)
521	{
522	}
523
524
525	ssize_t
526	qcrypto_tls_session_write(QCryptoTLSSession *sess,
527	const char *buf,
528	size_t len)
529	{
530	errno = -EIO;
531	return -1;
532	}
533
534
535	ssize_t
536	qcrypto_tls_session_read(QCryptoTLSSession *sess,
537	char *buf,
538	size_t len)
539	{
540	errno = -EIO;
541	return -1;
542	}
543
544
545	int
546	qcrypto_tls_session_handshake(QCryptoTLSSession *sess,
547	Error **errp)
548	{
549	error_setg(errp, "TLS requires GNUTLS support");
550	return -1;
551	}
552
553
554	QCryptoTLSSessionHandshakeStatus
555	qcrypto_tls_session_get_handshake_status(QCryptoTLSSession *sess)
556	{
557	return QCRYPTO_TLS_HANDSHAKE_COMPLETE;
558	}
559
560
561	int
562	qcrypto_tls_session_get_key_size(QCryptoTLSSession *sess,
563	Error **errp)
564	{
565	error_setg(errp, "TLS requires GNUTLS support");
566	return -1;
567	}
568
569
570	char *
571	qcrypto_tls_session_get_peer_name(QCryptoTLSSession *sess)
572	{
573	return NULL;
574	}
575
576	#endif