[libvirt] [PATCH v10 2/4] domain: Add optional 'tls' attribute for TCP chardev
John Ferlan
jferlan at redhat.com
Wed Oct 19 20:53:54 UTC 2016
Add an optional "tls='yes|no'" attribute for a TCP chardev.
For QEMU, this will allow for disabling the host config setting of the
'chardev_tls' for a domain chardev channel by setting the value to "no" or
to attempt to use a host TLS environment when setting the value to "yes"
when the host config 'chardev_tls' setting is disabled, but a TLS environment
is configured via either the host config 'chardev_tls_x509_cert_dir' or
'default_tls_x509_cert_dir'
Alter qemuDomainSupportTLSChardevTCP to augment the decision points for
choosing whether to try to use TLS.
Signed-off-by: John Ferlan <jferlan at redhat.com>
---
docs/formatdomain.html.in | 28 ++++++++++++
docs/schemas/domaincommon.rng | 5 +++
src/conf/domain_conf.c | 22 +++++++++-
src/conf/domain_conf.h | 1 +
src/qemu/qemu_command.c | 2 +-
src/qemu/qemu_domain.c | 20 +++++++--
src/qemu/qemu_domain.h | 3 +-
src/qemu/qemu_hotplug.c | 4 +-
...uxml2argv-serial-tcp-tlsx509-chardev-notls.args | 30 +++++++++++++
...muxml2argv-serial-tcp-tlsx509-chardev-notls.xml | 50 ++++++++++++++++++++++
tests/qemuxml2argvtest.c | 3 ++
...xml2xmlout-serial-tcp-tlsx509-chardev-notls.xml | 1 +
tests/qemuxml2xmltest.c | 1 +
13 files changed, 162 insertions(+), 8 deletions(-)
create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-serial-tcp-tlsx509-chardev-notls.args
create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-serial-tcp-tlsx509-chardev-notls.xml
create mode 120000 tests/qemuxml2xmloutdata/qemuxml2xmlout-serial-tcp-tlsx509-chardev-notls.xml
diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
index 9051178..da6be67 100644
--- a/docs/formatdomain.html.in
+++ b/docs/formatdomain.html.in
@@ -6204,6 +6204,34 @@ qemu-kvm -net nic,model=? /dev/null
</devices>
...</pre>
+ <p>
+ <span class="since">Since 2.4.0,</span> the optional attribute
+ <code>tls</code> can be used to control whether a serial chardev
+ TCP communication channel would utilize a hypervisor configured
+ TLS X.509 certificate environment in order to encrypt the data
+ channel. For the QEMU hypervisor, usage of a TLS envronment can
+ be controlled on the host by the <code>chardev_tls</code> and
+ <code>chardev_tls_x509_cert_dir</code> or
+ <code>default_tls_x509_cert_dir</code> settings in the file
+ /etc/libvirt/qemu.conf. If <code>chardev_tls</code> is enabled,
+ then unless the <code>tls</code> attribute is set to "no", libvirt
+ will use the host configured TLS environment.
+ If <code>chardev_tls</code> is disabled, but the <code>tls</code>
+ attribute is set to "yes", then libvirt will attempt to use the
+ host TLS environment if either the <code>chardev_tls_x509_cert_dir</code>
+ or <code>default_tls_x509_cert_dir</code> TLS directory structure exists.
+ </p>
+<pre>
+ ...
+ <devices>
+ <serial type="tcp">
+ <source mode='connect' host="127.0.0.1" service="5555" tls="yes"/>
+ <protocol type="raw"/>
+ <target port="0"/>
+ </serial>
+ </devices>
+ ...</pre>
+
<h6><a name="elementsCharUDP">UDP network console</a></h6>
<p>
diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng
index 3106510..e6741bb 100644
--- a/docs/schemas/domaincommon.rng
+++ b/docs/schemas/domaincommon.rng
@@ -3453,6 +3453,11 @@
<ref name="virOnOff"/>
</attribute>
</optional>
+ <optional>
+ <attribute name="tls">
+ <ref name="virYesNo"/>
+ </attribute>
+ </optional>
<zeroOrMore>
<ref name='devSeclabel'/>
</zeroOrMore>
diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index 89473db..e4fa9ad 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -1997,6 +1997,8 @@ virDomainChrSourceDefCopy(virDomainChrSourceDefPtr dest,
if (VIR_STRDUP(dest->data.tcp.service, src->data.tcp.service) < 0)
return -1;
+
+ dest->data.tcp.haveTLS = src->data.tcp.haveTLS;
break;
case VIR_DOMAIN_CHR_TYPE_UNIX:
@@ -10040,6 +10042,7 @@ virDomainChrSourceDefParseXML(virDomainChrSourceDefPtr def,
char *master = NULL;
char *slave = NULL;
char *append = NULL;
+ char *haveTLS = NULL;
int remaining = 0;
while (cur != NULL) {
@@ -10047,6 +10050,8 @@ virDomainChrSourceDefParseXML(virDomainChrSourceDefPtr def,
if (xmlStrEqual(cur->name, BAD_CAST "source")) {
if (!mode)
mode = virXMLPropString(cur, "mode");
+ if (!haveTLS)
+ haveTLS = virXMLPropString(cur, "tls");
switch ((virDomainChrType) def->type) {
case VIR_DOMAIN_CHR_TYPE_FILE:
@@ -10223,6 +10228,15 @@ virDomainChrSourceDefParseXML(virDomainChrSourceDefPtr def,
def->data.tcp.listen = true;
}
+ if (haveTLS &&
+ (def->data.tcp.haveTLS =
+ virTristateBoolTypeFromString(haveTLS)) <= 0) {
+ virReportError(VIR_ERR_XML_ERROR,
+ _("unknown chardev 'tls' setting '%s'"),
+ haveTLS);
+ goto error;
+ }
+
if (!protocol)
def->data.tcp.protocol = VIR_DOMAIN_CHR_TCP_PROTOCOL_RAW;
else if ((def->data.tcp.protocol =
@@ -10307,6 +10321,7 @@ virDomainChrSourceDefParseXML(virDomainChrSourceDefPtr def,
VIR_FREE(append);
VIR_FREE(logappend);
VIR_FREE(logfile);
+ VIR_FREE(haveTLS);
return remaining;
@@ -21466,7 +21481,12 @@ virDomainChrSourceDefFormat(virBufferPtr buf,
virBufferAsprintf(buf, "<source mode='%s' ",
def->data.tcp.listen ? "bind" : "connect");
virBufferEscapeString(buf, "host='%s' ", def->data.tcp.host);
- virBufferEscapeString(buf, "service='%s'/>\n", def->data.tcp.service);
+ virBufferEscapeString(buf, "service='%s'", def->data.tcp.service);
+ if (def->data.tcp.haveTLS != VIR_TRISTATE_BOOL_ABSENT)
+ virBufferAsprintf(buf, " tls='%s'",
+ virTristateBoolTypeToString(def->data.tcp.haveTLS));
+ virBufferAddLit(buf, "/>\n");
+
virBufferAsprintf(buf, "<protocol type='%s'/>\n",
virDomainChrTcpProtocolTypeToString(
def->data.tcp.protocol));
diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
index 04f2e40..fcadf6c 100644
--- a/src/conf/domain_conf.h
+++ b/src/conf/domain_conf.h
@@ -1094,6 +1094,7 @@ struct _virDomainChrSourceDef {
bool listen;
int protocol;
bool tlscreds;
+ int haveTLS; /* enum virTristateBool */
} tcp;
struct {
char *bindHost;
diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index d45a7de..f00751a 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -4943,7 +4943,7 @@ qemuBuildChrChardevStr(virLogManagerPtr logManager,
if (dev->data.tcp.listen)
virBufferAdd(&buf, nowait ? ",server,nowait" : ",server", -1);
- if (qemuDomainSupportTLSChardevTCP(cfg)) {
+ if (qemuDomainSupportTLSChardevTCP(cfg, dev)) {
char *objalias = NULL;
if (qemuBuildTLSx509CommandLine(cmd, cfg->chardevTLSx509certdir,
diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
index 746d94f..7b518c6 100644
--- a/src/qemu/qemu_domain.c
+++ b/src/qemu/qemu_domain.c
@@ -6302,15 +6302,29 @@ qemuDomainSupportsVideoVga(virDomainVideoDefPtr video,
/* qemuDomainSupportTLSChardevTCP
* @cfg: Pointer to driver cfg
+ * @dev: Pointer to chardev source
*
- * Let's check if this host supports using the TLS environment for chardev.
+ * Let's check if this host and/or domain supports or desires to use
+ * the TLS environment for the passed chardev TCP.
+ *
+ * If we have an environment and as long as the domain config doesn't have
+ * the "tls='no'" property, then we assume it's desired.
+ *
+ * If the host global isn't set, but the domain chardev config is requesting
+ * to use TLS and we find what appears to be some environment configured,
+ * then let's also try. This action could fail later in QEMU if the environment
+ * isn't set up to the exact specifications.
*
* Returns true if we want to use TLS, false otherwise.
*/
bool
-qemuDomainSupportTLSChardevTCP(virQEMUDriverConfigPtr cfg)
+qemuDomainSupportTLSChardevTCP(virQEMUDriverConfigPtr cfg,
+ const virDomainChrSourceDef *dev)
{
- if (cfg->chardevTLS)
+ if (cfg->chardevTLS && dev->data.tcp.haveTLS != VIR_TRISTATE_BOOL_NO)
+ return true;
+ if (!cfg->chardevTLS && dev->data.tcp.haveTLS == VIR_TRISTATE_BOOL_YES &&
+ virFileExists(cfg->chardevTLSx509certdir))
return true;
return false;
}
diff --git a/src/qemu/qemu_domain.h b/src/qemu/qemu_domain.h
index 7ecafac..156e0fc 100644
--- a/src/qemu/qemu_domain.h
+++ b/src/qemu/qemu_domain.h
@@ -755,5 +755,6 @@ int qemuDomainCheckMonitor(virQEMUDriverPtr driver,
bool qemuDomainSupportsVideoVga(virDomainVideoDefPtr video,
virQEMUCapsPtr qemuCaps);
-bool qemuDomainSupportTLSChardevTCP(virQEMUDriverConfigPtr cfg);
+bool qemuDomainSupportTLSChardevTCP(virQEMUDriverConfigPtr cfg,
+ const virDomainChrSourceDef *dev);
#endif /* __QEMU_DOMAIN_H__ */
diff --git a/src/qemu/qemu_hotplug.c b/src/qemu/qemu_hotplug.c
index c2b43b1..9643a68 100644
--- a/src/qemu/qemu_hotplug.c
+++ b/src/qemu/qemu_hotplug.c
@@ -1730,7 +1730,7 @@ int qemuDomainAttachChrDevice(virQEMUDriverPtr driver,
goto cleanup;
if (dev->type == VIR_DOMAIN_CHR_TYPE_TCP &&
- qemuDomainSupportTLSChardevTCP(cfg)) {
+ qemuDomainSupportTLSChardevTCP(cfg, dev)) {
if (qemuBuildTLSx509BackendProps(cfg->chardevTLSx509certdir,
dev->data.tcp.listen,
cfg->chardevTLSx509verify,
@@ -4404,7 +4404,7 @@ int qemuDomainDetachChrDevice(virQEMUDriverPtr driver,
goto cleanup;
if (tmpChr->source.type == VIR_DOMAIN_CHR_TYPE_TCP &&
- qemuDomainSupportTLSChardevTCP(cfg) &&
+ qemuDomainSupportTLSChardevTCP(cfg, &tmpChr->source) &&
!(objAlias = qemuAliasTLSObjFromChardevAlias(charAlias)))
goto cleanup;
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-serial-tcp-tlsx509-chardev-notls.args b/tests/qemuxml2argvdata/qemuxml2argv-serial-tcp-tlsx509-chardev-notls.args
new file mode 100644
index 0000000..cac0d85
--- /dev/null
+++ b/tests/qemuxml2argvdata/qemuxml2argv-serial-tcp-tlsx509-chardev-notls.args
@@ -0,0 +1,30 @@
+LC_ALL=C \
+PATH=/bin \
+HOME=/home/test \
+USER=test \
+LOGNAME=test \
+QEMU_AUDIO_DRV=none \
+/usr/bin/qemu \
+-name QEMUGuest1 \
+-S \
+-M pc \
+-m 214 \
+-smp 1,sockets=1,cores=1,threads=1 \
+-uuid c7a5fdbd-edaf-9455-926a-d65c16db1809 \
+-nographic \
+-nodefconfig \
+-nodefaults \
+-chardev socket,id=charmonitor,path=/tmp/lib/domain--1-QEMUGuest1/monitor.sock,\
+server,nowait \
+-mon chardev=charmonitor,id=monitor,mode=readline \
+-no-acpi \
+-boot c \
+-usb \
+-drive file=/dev/HostVG/QEMUGuest1,format=raw,if=none,id=drive-ide0-0-0 \
+-device ide-drive,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0 \
+-chardev udp,id=charserial0,host=127.0.0.1,port=2222,localaddr=127.0.0.1,\
+localport=1111 \
+-device isa-serial,chardev=charserial0,id=serial0 \
+-chardev socket,id=charserial1,host=127.0.0.1,port=5555 \
+-device isa-serial,chardev=charserial1,id=serial1 \
+-device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-serial-tcp-tlsx509-chardev-notls.xml b/tests/qemuxml2argvdata/qemuxml2argv-serial-tcp-tlsx509-chardev-notls.xml
new file mode 100644
index 0000000..debc69b
--- /dev/null
+++ b/tests/qemuxml2argvdata/qemuxml2argv-serial-tcp-tlsx509-chardev-notls.xml
@@ -0,0 +1,50 @@
+<domain type='qemu'>
+ <name>QEMUGuest1</name>
+ <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+ <memory unit='KiB'>219136</memory>
+ <currentMemory unit='KiB'>219136</currentMemory>
+ <vcpu placement='static'>1</vcpu>
+ <os>
+ <type arch='i686' machine='pc'>hvm</type>
+ <boot dev='hd'/>
+ </os>
+ <clock offset='utc'/>
+ <on_poweroff>destroy</on_poweroff>
+ <on_reboot>restart</on_reboot>
+ <on_crash>destroy</on_crash>
+ <devices>
+ <emulator>/usr/bin/qemu</emulator>
+ <disk type='block' device='disk'>
+ <source dev='/dev/HostVG/QEMUGuest1'/>
+ <target dev='hda' bus='ide'/>
+ <address type='drive' controller='0' bus='0' target='0' unit='0'/>
+ </disk>
+ <controller type='usb' index='0'>
+ <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/>
+ </controller>
+ <controller type='ide' index='0'>
+ <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/>
+ </controller>
+ <controller type='pci' index='0' model='pci-root'/>
+ <serial type='udp'>
+ <source mode='bind' host='127.0.0.1' service='1111'/>
+ <source mode='connect' host='127.0.0.1' service='2222'/>
+ <target port='0'/>
+ </serial>
+ <serial type='tcp'>
+ <source mode='connect' host='127.0.0.1' service='5555' tls='no'/>
+ <protocol type='raw'/>
+ <target port='0'/>
+ </serial>
+ <console type='udp'>
+ <source mode='bind' host='127.0.0.1' service='1111'/>
+ <source mode='connect' host='127.0.0.1' service='2222'/>
+ <target type='serial' port='0'/>
+ </console>
+ <input type='mouse' bus='ps2'/>
+ <input type='keyboard' bus='ps2'/>
+ <memballoon model='virtio'>
+ <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
+ </memballoon>
+ </devices>
+</domain>
diff --git a/tests/qemuxml2argvtest.c b/tests/qemuxml2argvtest.c
index 3e9f825..52d85fa 100644
--- a/tests/qemuxml2argvtest.c
+++ b/tests/qemuxml2argvtest.c
@@ -1167,6 +1167,9 @@ mymain(void)
QEMU_CAPS_CHARDEV, QEMU_CAPS_NODEFCONFIG,
QEMU_CAPS_OBJECT_TLS_CREDS_X509);
driver.config->chardevTLSx509verify = 0;
+ DO_TEST("serial-tcp-tlsx509-chardev-notls",
+ QEMU_CAPS_CHARDEV, QEMU_CAPS_NODEFCONFIG,
+ QEMU_CAPS_OBJECT_TLS_CREDS_X509);
driver.config->chardevTLS = 0;
VIR_FREE(driver.config->chardevTLSx509certdir);
DO_TEST("serial-many-chardev",
diff --git a/tests/qemuxml2xmloutdata/qemuxml2xmlout-serial-tcp-tlsx509-chardev-notls.xml b/tests/qemuxml2xmloutdata/qemuxml2xmlout-serial-tcp-tlsx509-chardev-notls.xml
new file mode 120000
index 0000000..26484c9
--- /dev/null
+++ b/tests/qemuxml2xmloutdata/qemuxml2xmlout-serial-tcp-tlsx509-chardev-notls.xml
@@ -0,0 +1 @@
+../qemuxml2argvdata/qemuxml2argv-serial-tcp-tlsx509-chardev-notls.xml
\ No newline at end of file
diff --git a/tests/qemuxml2xmltest.c b/tests/qemuxml2xmltest.c
index 95c0bf2..64da80a 100644
--- a/tests/qemuxml2xmltest.c
+++ b/tests/qemuxml2xmltest.c
@@ -534,6 +534,7 @@ mymain(void)
DO_TEST("serial-udp", NONE);
DO_TEST("serial-tcp-telnet", NONE);
DO_TEST("serial-tcp-tlsx509-chardev", NONE);
+ DO_TEST("serial-tcp-tlsx509-chardev-notls", NONE);
DO_TEST("serial-many", NONE);
DO_TEST("serial-spiceport", NONE);
DO_TEST("serial-spiceport-nospice", NONE);
--
2.7.4
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