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crypto: stop requiring "key encipherment" usage in x509 certs

Browse source 
This usage flag was deprecated by RFC8813, such that it is
forbidden to be present for certs using ECDSA/ECDH algorithms,
and in TLS 1.3 is conceptually obsolete.

As such many valid certs will no longer have this key usage
flag set, and QEMU should not be rejecting them, as this
prevents use of otherwise valid & desirable algorithms.

Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
This commit is contained in:
Daniel P. Berrangé 2025-07-01 18:33:21 +01:00
parent 87d6282e53
commit 3995fc238e
6 changed files with 34 additions and 49 deletions
Download patch file Download diff file Expand all files Collapse all files

10
crypto/tlscredsx509.c
View file

@ -144,7 +144,7 @@ qcrypto_tls_creds_check_cert_key_usage(QCryptoTLSCredsX509 *creds,
if (status < 0) {
if (status == GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE) {
usage = isCA ? GNUTLS_KEY_KEY_CERT_SIGN :
GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT;
GNUTLS_KEY_DIGITAL_SIGNATURE;
} else {
error_setg(errp,
"Unable to query certificate %s key usage: %s",
@ -171,14 +171,6 @@ qcrypto_tls_creds_check_cert_key_usage(QCryptoTLSCredsX509 *creds,
return -1;
}
}
if (!(usage & GNUTLS_KEY_KEY_ENCIPHERMENT)) {
if (critical) {
error_setg(errp,
"Certificate %s usage does not permit key "
"encipherment", certFile);
return -1;
}
}
}
return 0;

13
docs/system/tls.rst
View file

@ -118,7 +118,6 @@ information for each server, and use it to issue server certificates.
ip_address = 2620:0:cafe::87
ip_address = 2001:24::92
tls_www_server
encryption_key
signing_key
EOF
# certtool --generate-privkey > server-hostNNN-key.pem
@ -134,9 +133,8 @@ the subject alt name extension data. The ``tls_www_server`` keyword is
the key purpose extension to indicate this certificate is intended for
usage in a web server. Although QEMU network services are not in fact
HTTP servers (except for VNC websockets), setting this key purpose is
still recommended. The ``encryption_key`` and ``signing_key`` keyword is
the key usage extension to indicate this certificate is intended for
usage in the data session.
still recommended. The ``signing_key`` keyword is the key usage extension
to indicate this certificate is intended for usage in the data session.
The ``server-hostNNN-key.pem`` and ``server-hostNNN-cert.pem`` files
should now be securely copied to the server for which they were
@ -171,7 +169,6 @@ certificates.
organization = Name of your organization
cn = hostNNN.foo.example.com
tls_www_client
encryption_key
signing_key
EOF
# certtool --generate-privkey > client-hostNNN-key.pem
@ -187,9 +184,8 @@ the ``dns_name`` and ``ip_address`` fields are not included. The
``tls_www_client`` keyword is the key purpose extension to indicate this
certificate is intended for usage in a web client. Although QEMU network
clients are not in fact HTTP clients, setting this key purpose is still
recommended. The ``encryption_key`` and ``signing_key`` keyword is the
key usage extension to indicate this certificate is intended for usage
in the data session.
recommended. The ``signing_key`` keyword is the key usage extension to
indicate this certificate is intended for usage in the data session.
The ``client-hostNNN-key.pem`` and ``client-hostNNN-cert.pem`` files
should now be securely copied to the client for which they were
@ -222,7 +218,6 @@ client and server instructions in one.
ip_address = 2001:24::92
tls_www_server
tls_www_client
encryption_key
signing_key
EOF
# certtool --generate-privkey > both-hostNNN-key.pem

6
tests/unit/crypto-tls-x509-helpers.h
View file

@ -148,8 +148,7 @@ void test_tls_cleanup(const char *keyfile);
.basicConstraintsIsCA = false, \
.keyUsageEnable = true, \
.keyUsageCritical = true, \
.keyUsageValue = \
GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT, \
.keyUsageValue = GNUTLS_KEY_DIGITAL_SIGNATURE, \
.keyPurposeEnable = true, \
.keyPurposeCritical = true, \
.keyPurposeOID1 = GNUTLS_KP_TLS_WWW_CLIENT, \
@ -168,8 +167,7 @@ void test_tls_cleanup(const char *keyfile);
.basicConstraintsIsCA = false, \
.keyUsageEnable = true, \
.keyUsageCritical = true, \
.keyUsageValue = \
GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT, \
.keyUsageValue = GNUTLS_KEY_DIGITAL_SIGNATURE, \
.keyPurposeEnable = true, \
.keyPurposeCritical = true, \
.keyPurposeOID1 = GNUTLS_KP_TLS_WWW_SERVER, \

36
tests/unit/test-crypto-tlscredsx509.c
View file

@ -169,14 +169,14 @@ int main(int argc, char **argv)
"UK", "qemu.org", NULL, NULL, NULL, NULL,
true, true, false,
true, true,
GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT,
GNUTLS_KEY_DIGITAL_SIGNATURE,
true, true, GNUTLS_KP_TLS_WWW_SERVER, NULL,
0, 0);
TLS_CERT_REQ(clientcertreq, cacertreq,
"UK", "qemu", NULL, NULL, NULL, NULL,
true, true, false,
true, true,
GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT,
GNUTLS_KEY_DIGITAL_SIGNATURE,
true, true, GNUTLS_KP_TLS_WWW_CLIENT, NULL,
0, 0);
@ -199,7 +199,7 @@ int main(int argc, char **argv)
"UK", "qemu.org", NULL, NULL, NULL, NULL,
true, true, false,
true, true,
GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT,
GNUTLS_KEY_DIGITAL_SIGNATURE,
true, true, GNUTLS_KP_TLS_WWW_SERVER, NULL,
0, 0);
@ -214,7 +214,7 @@ int main(int argc, char **argv)
"UK", "qemu.org", NULL, NULL, NULL, NULL,
true, true, false,
true, true,
GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT,
GNUTLS_KEY_DIGITAL_SIGNATURE,
true, true, GNUTLS_KP_TLS_WWW_SERVER, NULL,
0, 0);
@ -229,7 +229,7 @@ int main(int argc, char **argv)
"UK", "qemu.org", NULL, NULL, NULL, NULL,
true, true, false,
true, true,
GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT,
GNUTLS_KEY_DIGITAL_SIGNATURE,
true, true, GNUTLS_KP_TLS_WWW_SERVER, NULL,
0, 0);
@ -253,7 +253,7 @@ int main(int argc, char **argv)
"UK", "qemu.org", NULL, NULL, NULL, NULL,
true, true, false,
true, true,
GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT,
GNUTLS_KEY_DIGITAL_SIGNATURE,
true, true, GNUTLS_KP_TLS_WWW_SERVER, NULL,
0, 0);
/* no-basic */
@ -267,7 +267,7 @@ int main(int argc, char **argv)
"UK", "qemu.org", NULL, NULL, NULL, NULL,
true, true, false,
true, true,
GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT,
GNUTLS_KEY_DIGITAL_SIGNATURE,
true, true, GNUTLS_KP_TLS_WWW_SERVER, NULL,
0, 0);
/* Key usage:dig-sig:critical */
@ -281,7 +281,7 @@ int main(int argc, char **argv)
"UK", "qemu.org", NULL, NULL, NULL, NULL,
true, true, false,
true, true,
GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT,
GNUTLS_KEY_DIGITAL_SIGNATURE,
true, true, GNUTLS_KP_TLS_WWW_SERVER, NULL,
0, 0);
@ -306,7 +306,7 @@ int main(int argc, char **argv)
"UK", "qemu", NULL, NULL, NULL, NULL,
true, true, false,
true, true,
GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT |
GNUTLS_KEY_DIGITAL_SIGNATURE |
GNUTLS_KEY_KEY_CERT_SIGN,
false, false, NULL, NULL,
0, 0);
@ -409,7 +409,7 @@ int main(int argc, char **argv)
"UK", "qemu", NULL, NULL, NULL, NULL,
true, true, false,
true, true,
GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT |
GNUTLS_KEY_DIGITAL_SIGNATURE |
GNUTLS_KEY_KEY_CERT_SIGN,
false, false, NULL, NULL,
0, 0);
@ -511,21 +511,21 @@ int main(int argc, char **argv)
"UK", "qemu.org", NULL, NULL, NULL, NULL,
true, true, false,
true, true,
GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT,
GNUTLS_KEY_DIGITAL_SIGNATURE,
true, true, GNUTLS_KP_TLS_WWW_SERVER, NULL,
0, 0);
TLS_CERT_REQ(servercertexp1req, cacertreq,
"UK", "qemu", NULL, NULL, NULL, NULL,
true, true, false,
true, true,
GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT,
GNUTLS_KEY_DIGITAL_SIGNATURE,
true, true, GNUTLS_KP_TLS_WWW_SERVER, NULL,
0, -1);
TLS_CERT_REQ(clientcertexp1req, cacertreq,
"UK", "qemu", NULL, NULL, NULL, NULL,
true, true, false,
true, true,
GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT,
GNUTLS_KEY_DIGITAL_SIGNATURE,
true, true, GNUTLS_KP_TLS_WWW_CLIENT, NULL,
0, -1);
@ -549,21 +549,21 @@ int main(int argc, char **argv)
"UK", "qemu", NULL, NULL, NULL, NULL,
true, true, false,
true, true,
GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT,
GNUTLS_KEY_DIGITAL_SIGNATURE,
true, true, GNUTLS_KP_TLS_WWW_SERVER, NULL,
0, 0);
TLS_CERT_REQ(servercertnew1req, cacertreq,
"UK", "qemu", NULL, NULL, NULL, NULL,
true, true, false,
true, true,
GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT,
GNUTLS_KEY_DIGITAL_SIGNATURE,
true, true, GNUTLS_KP_TLS_WWW_SERVER, NULL,
1, 2);
TLS_CERT_REQ(clientcertnew1req, cacertreq,
"UK", "qemu", NULL, NULL, NULL, NULL,
true, true, false,
true, true,
GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT,
GNUTLS_KEY_DIGITAL_SIGNATURE,
true, true, GNUTLS_KP_TLS_WWW_CLIENT, NULL,
1, 2);
@ -614,14 +614,14 @@ int main(int argc, char **argv)
"UK", "qemu.org", NULL, NULL, NULL, NULL,
true, true, false,
true, true,
GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT,
GNUTLS_KEY_DIGITAL_SIGNATURE,
true, true, GNUTLS_KP_TLS_WWW_SERVER, NULL,
0, 0);
TLS_CERT_REQ(clientcertlevel2breq, cacertlevel1breq,
"UK", "qemu client level 2b", NULL, NULL, NULL, NULL,
true, true, false,
true, true,
GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT,
GNUTLS_KEY_DIGITAL_SIGNATURE,
true, true, GNUTLS_KP_TLS_WWW_CLIENT, NULL,
0, 0);

14
tests/unit/test-crypto-tlssession.c
View file

@ -472,14 +472,14 @@ int main(int argc, char **argv)
"UK", "qemu.org", NULL, NULL, NULL, NULL,
true, true, false,
true, true,
GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT,
GNUTLS_KEY_DIGITAL_SIGNATURE,
true, true, GNUTLS_KP_TLS_WWW_SERVER, NULL,
0, 0);
TLS_CERT_REQ(clientcertreq, cacertreq,
"UK", "qemu", NULL, NULL, NULL, NULL,
true, true, false,
true, true,
GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT,
GNUTLS_KEY_DIGITAL_SIGNATURE,
true, true, GNUTLS_KP_TLS_WWW_CLIENT, NULL,
0, 0);
@ -487,7 +487,7 @@ int main(int argc, char **argv)
"UK", "qemu", NULL, NULL, NULL, NULL,
true, true, false,
true, true,
GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT,
GNUTLS_KEY_DIGITAL_SIGNATURE,
true, true, GNUTLS_KP_TLS_WWW_CLIENT, NULL,
0, 0);
@ -506,7 +506,7 @@ int main(int argc, char **argv)
"192.168.122.1", "fec0::dead:beaf",
true, true, false,
true, true,
GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT,
GNUTLS_KEY_DIGITAL_SIGNATURE,
true, true, GNUTLS_KP_TLS_WWW_SERVER, NULL,
0, 0);
/* This intentionally doesn't replicate */
@ -515,7 +515,7 @@ int main(int argc, char **argv)
"192.168.122.1", "fec0::dead:beaf",
true, true, false,
true, true,
GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT,
GNUTLS_KEY_DIGITAL_SIGNATURE,
true, true, GNUTLS_KP_TLS_WWW_SERVER, NULL,
0, 0);
@ -619,14 +619,14 @@ int main(int argc, char **argv)
"UK", "qemu.org", NULL, NULL, NULL, NULL,
true, true, false,
true, true,
GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT,
GNUTLS_KEY_DIGITAL_SIGNATURE,
true, true, GNUTLS_KP_TLS_WWW_SERVER, NULL,
0, 0);
TLS_CERT_REQ(clientcertlevel2breq, cacertlevel1breq,
"UK", "qemu client level 2b", NULL, NULL, NULL, NULL,
true, true, false,
true, true,
GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT,
GNUTLS_KEY_DIGITAL_SIGNATURE,
true, true, GNUTLS_KP_TLS_WWW_CLIENT, NULL,
0, 0);

4
tests/unit/test-io-channel-tls.c
View file

@ -302,14 +302,14 @@ int main(int argc, char **argv)
"UK", "qemu.org", NULL, NULL, NULL, NULL,
true, true, false,
true, true,
GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT,
GNUTLS_KEY_DIGITAL_SIGNATURE,
true, true, GNUTLS_KP_TLS_WWW_SERVER, NULL,
0, 0);
TLS_CERT_REQ(clientcertreq, cacertreq,
"UK", "qemu", NULL, NULL, NULL, NULL,
true, true, false,
true, true,
GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT,
GNUTLS_KEY_DIGITAL_SIGNATURE,
true, true, GNUTLS_KP_TLS_WWW_CLIENT, NULL,
0, 0);