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From bb848feec0f3f10e92dd8e5231ae7aa89b5598f3 Mon Sep 17 00:00:00 2001
From: Jiri Denemark <jdenemar@redhat.com>
Date: Tue, 28 Jun 2016 14:39:58 +0200
Subject: [PATCH] qemu: Let empty default VNC password work as documented
CVE-2016-5008
Setting an empty graphics password is documented as a way to disable
VNC/SPICE access, but QEMU does not always behaves like that. VNC would
happily accept the empty password. Let's enforce the behavior by setting
password expiration to "now".
https://bugzilla.redhat.com/show_bug.cgi?id=1180092
Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
---
src/qemu/qemu_hotplug.c | 14 +++++++-------
1 files changed, 7 insertions(+), 7 deletions(-)
diff --git a/src/qemu/qemu_hotplug.c b/src/qemu/qemu_hotplug.c
index e0b8230..bf6430d 100644
--- a/src/qemu/qemu_hotplug.c
+++ b/src/qemu/qemu_hotplug.c
@@ -3933,6 +3933,7 @@ qemuDomainChangeGraphicsPasswords(virQEMUDriverPtr driver,
time_t now = time(NULL);
char expire_time [64];
const char *connected = NULL;
+ const char *password;
int ret = -1;
virQEMUDriverConfigPtr cfg = virQEMUDriverGetConfig(driver);
@@ -3940,16 +3941,14 @@ qemuDomainChangeGraphicsPasswords(virQEMUDriverPtr driver,
ret = 0;
goto cleanup;
}
+ password = auth->passwd ? auth->passwd : defaultPasswd;
if (auth->connected)
connected = virDomainGraphicsAuthConnectedTypeToString(auth->connected);
if (qemuDomainObjEnterMonitorAsync(driver, vm, asyncJob) < 0)
goto cleanup;
- ret = qemuMonitorSetPassword(priv->mon,
- type,
- auth->passwd ? auth->passwd : defaultPasswd,
- connected);
+ ret = qemuMonitorSetPassword(priv->mon, type, password, connected);
if (ret == -2) {
if (type != VIR_DOMAIN_GRAPHICS_TYPE_VNC) {
@@ -3957,14 +3956,15 @@ qemuDomainChangeGraphicsPasswords(virQEMUDriverPtr driver,
_("Graphics password only supported for VNC"));
ret = -1;
} else {
- ret = qemuMonitorSetVNCPassword(priv->mon,
- auth->passwd ? auth->passwd : defaultPasswd);
+ ret = qemuMonitorSetVNCPassword(priv->mon, password);
}
}
if (ret != 0)
goto end_job;
- if (auth->expires) {
+ if (password[0] == '\0') {
+ snprintf(expire_time, sizeof(expire_time), "now");
+ } else if (auth->expires) {
time_t lifetime = auth->validTo - now;
if (lifetime <= 0)
snprintf(expire_time, sizeof(expire_time), "now");
--
1.7.1
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