[libvirt] [PATCH 07/12] Switch QEMU driver over to use the DAC security driver
Daniel P. Berrange
berrange at redhat.com
Wed Jan 20 15:15:04 UTC 2010
Remove all the QEMU driver calls for setting file ownership and
process uid/gid. Instead wire in the QEMU DAC security driver,
stacking it ontop of the primary SELinux/AppArmour driver.
* qemu/qemu_driver.c: Switch over to new DAC security driver
---
src/qemu/qemu_driver.c | 311 ++----------------------------------------
src/qemu/qemu_security_dac.c | 2 +-
2 files changed, 13 insertions(+), 300 deletions(-)
diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 8195b74..9554852 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -69,7 +69,8 @@
#include "pci.h"
#include "hostusb.h"
#include "processinfo.h"
-#include "security/security_driver.h"
+#include "qemu_security_stacked.h"
+#include "qemu_security_dac.h"
#include "cgroup.h"
#include "libvirt_internal.h"
#include "xml.h"
@@ -936,7 +937,12 @@ qemudSecurityInit(struct qemud_driver *qemud_drv)
return 0;
}
- qemud_drv->securityDriver = security_drv;
+ qemuSecurityStackedSetDriver(qemud_drv);
+ qemuSecurityDACSetDriver(qemud_drv);
+
+ qemud_drv->securityPrimaryDriver = security_drv;
+ qemud_drv->securitySecondaryDriver = &qemuDACSecurityDriver;
+ qemud_drv->securityDriver = &qemuStackedSecurityDriver;
VIR_INFO("Initialized security driver %s", security_drv->name);
@@ -2438,225 +2444,6 @@ cleanup:
}
-static int qemudDomainSetSecurityLabel(virConnectPtr conn, struct qemud_driver *driver, virDomainObjPtr vm)
-{
- int rc = 0;
-
- if (driver->securityDriver &&
- driver->securityDriver->domainSetSecurityProcessLabel &&
- driver->securityDriver->domainSetSecurityProcessLabel(conn, driver->securityDriver, vm) < 0)
- rc = -1;
-
- return rc;
-}
-
-
-#ifdef __linux__
-struct qemuFileOwner {
- uid_t uid;
- gid_t gid;
-};
-
-static int qemuDomainSetHostdevUSBOwnershipActor(virConnectPtr conn,
- usbDevice *dev ATTRIBUTE_UNUSED,
- const char *file, void *opaque)
-{
- struct qemuFileOwner *owner = opaque;
-
- VIR_DEBUG("Setting ownership on %s to %d:%d", file, owner->uid, owner->gid);
-
- if (chown(file, owner->uid, owner->gid) < 0) {
- virReportSystemError(conn, errno, _("cannot set ownership on %s"), file);
- return -1;
- }
-
- return 0;
-}
-
-static int qemuDomainSetHostdevUSBOwnership(virConnectPtr conn,
- virDomainHostdevDefPtr def,
- uid_t uid, gid_t gid)
-{
- struct qemuFileOwner owner = { uid, gid };
- int ret = -1;
-
- usbDevice *dev = usbGetDevice(conn,
- def->source.subsys.u.usb.bus,
- def->source.subsys.u.usb.device,
- def->source.subsys.u.usb.vendor,
- def->source.subsys.u.usb.product);
-
- if (!dev)
- goto cleanup;
-
- ret = usbDeviceFileIterate(conn, dev,
- qemuDomainSetHostdevUSBOwnershipActor, &owner);
-
- usbFreeDevice(conn, dev);
-cleanup:
- return ret;
-}
-
-static int qemuDomainSetHostdevPCIOwnershipActor(virConnectPtr conn,
- pciDevice *dev ATTRIBUTE_UNUSED,
- const char *file, void *opaque)
-{
- struct qemuFileOwner *owner = opaque;
-
- VIR_DEBUG("Setting ownership on %s to %d:%d", file, owner->uid, owner->gid);
-
- if (chown(file, owner->uid, owner->gid) < 0) {
- virReportSystemError(conn, errno, _("cannot set ownership on %s"), file);
- return -1;
- }
-
- return 0;
-}
-
-static int qemuDomainSetHostdevPCIOwnership(virConnectPtr conn,
- virDomainHostdevDefPtr def,
- uid_t uid, gid_t gid)
-{
- struct qemuFileOwner owner = { uid, gid };
- int ret = -1;
-
- pciDevice *dev = pciGetDevice(conn,
- def->source.subsys.u.pci.domain,
- def->source.subsys.u.pci.bus,
- def->source.subsys.u.pci.slot,
- def->source.subsys.u.pci.function);
-
- if (!dev)
- goto cleanup;
-
- ret = pciDeviceFileIterate(conn, dev,
- qemuDomainSetHostdevPCIOwnershipActor, &owner);
-
- pciFreeDevice(conn, dev);
-cleanup:
- return ret;
-}
-#endif
-
-
-static int qemuDomainSetHostdevOwnership(virConnectPtr conn,
- virDomainHostdevDefPtr def,
- uid_t uid, gid_t gid)
-{
- if (def->mode != VIR_DOMAIN_HOSTDEV_MODE_SUBSYS)
- return 0;
-
-#ifdef __linux__
- switch (def->source.subsys.type) {
- case VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_USB:
- return qemuDomainSetHostdevUSBOwnership(conn, def, uid, gid);
-
- case VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_PCI:
- return qemuDomainSetHostdevPCIOwnership(conn, def, uid, gid);
-
- }
- return 0;
-#else
- qemudReportError(conn, NULL, NULL, VIR_ERR_NO_SUPPORT, "%s",
- _("unable to set host device ownership on this platform"));
- return -1;
-#endif
-
-}
-
-static int qemuDomainSetFileOwnership(virConnectPtr conn,
- const char *path,
- uid_t uid, gid_t gid)
-{
-
- if (!path)
- return 0;
-
- VIR_DEBUG("Setting ownership on %s to %d:%d", path, uid, gid);
- if (chown(path, uid, gid) < 0) {
- virReportSystemError(conn, errno, _("cannot set ownership on %s"),
- path);
- return -1;
- }
- return 0;
-}
-
-static int qemuDomainSetDeviceOwnership(virConnectPtr conn,
- struct qemud_driver *driver,
- virDomainDeviceDefPtr def,
- int restore)
-{
- uid_t uid;
- gid_t gid;
-
- if (!driver->privileged)
- return 0;
-
- /* short circuit case of root:root */
- if (!driver->user && !driver->group)
- return 0;
-
- uid = restore ? 0 : driver->user;
- gid = restore ? 0 : driver->group;
-
- switch (def->type) {
- case VIR_DOMAIN_DEVICE_DISK:
- if (restore &&
- (def->data.disk->readonly || def->data.disk->shared))
- return 0;
-
- return qemuDomainSetFileOwnership(conn, def->data.disk->src, uid, gid);
-
- case VIR_DOMAIN_DEVICE_HOSTDEV:
- return qemuDomainSetHostdevOwnership(conn, def->data.hostdev, uid, gid);
- }
-
- return 0;
-}
-
-static int qemuDomainSetAllDeviceOwnership(virConnectPtr conn,
- struct qemud_driver *driver,
- virDomainDefPtr def,
- int restore)
-{
- int i;
- uid_t uid;
- gid_t gid;
-
- if (!driver->privileged)
- return 0;
-
- /* short circuit case of root:root */
- if (!driver->user && !driver->group)
- return 0;
-
- uid = restore ? 0 : driver->user;
- gid = restore ? 0 : driver->group;
-
- if (qemuDomainSetFileOwnership(conn, def->os.kernel, uid, gid) < 0 ||
- qemuDomainSetFileOwnership(conn, def->os.initrd, uid, gid) < 0)
- return -1;
-
- for (i = 0 ; i < def->ndisks ; i++) {
- if (restore &&
- (def->disks[i]->readonly || def->disks[i]->shared))
- continue;
-
- if (qemuDomainSetFileOwnership(conn, def->disks[i]->src, uid, gid) < 0)
- return -1;
- }
-
- for (i = 0 ; i < def->nhostdevs ; i++) {
- if (qemuDomainSetHostdevOwnership(conn, def->hostdevs[i], uid, gid) < 0)
- return -1;
- }
-
- return 0;
-}
-
-static virDomainPtr qemudDomainLookupByName(virConnectPtr conn,
- const char *name);
-
struct qemudHookData {
virConnectPtr conn;
virDomainObjPtr vm;
@@ -2669,33 +2456,11 @@ static int qemudSecurityHook(void *data) {
if (qemuAddToCgroup(h->driver, h->vm->def) < 0)
return -1;
- if (qemudDomainSetSecurityLabel(h->conn, h->driver, h->vm) < 0)
+ if (h->driver->securityDriver &&
+ h->driver->securityDriver->domainSetSecurityProcessLabel &&
+ h->driver->securityDriver->domainSetSecurityProcessLabel(h->conn, h->driver->securityDriver, h->vm) < 0)
return -1;
- if (h->driver->privileged) {
- if (qemuDomainSetAllDeviceOwnership(h->conn, h->driver, h->vm->def, 0) < 0)
- return -1;
-
- DEBUG("Dropping privileges of VM to %d:%d", h->driver->user, h->driver->group);
-
- if (h->driver->group) {
- if (setregid(h->driver->group, h->driver->group) < 0) {
- virReportSystemError(NULL, errno,
- _("cannot change to '%d' group"),
- h->driver->group);
- return -1;
- }
- }
- if (h->driver->user) {
- if (setreuid(h->driver->user, h->driver->user) < 0) {
- virReportSystemError(NULL, errno,
- _("cannot change to '%d' user"),
- h->driver->user);
- return -1;
- }
- }
- }
-
return 0;
}
@@ -3078,10 +2843,6 @@ static void qemudShutdownVMDaemon(virConnectPtr conn,
virDomainDefClearPCIAddresses(vm->def);
virDomainDefClearDeviceAliases(vm->def);
- if (qemuDomainSetAllDeviceOwnership(conn, driver, vm->def, 1) < 0)
- VIR_WARN("Failed to restore all device ownership for %s",
- vm->def->name);
-
qemuDomainReAttachHostDevices(conn, driver, vm->def);
retry:
@@ -4132,14 +3893,6 @@ static int qemudDomainSave(virDomainPtr dom,
}
fd = -1;
- if (driver->privileged &&
- chown(path, driver->user, driver->group) < 0) {
- virReportSystemError(NULL, errno,
- _("unable to set ownership of '%s' to user %d:%d"),
- path, driver->user, driver->group);
- goto endjob;
- }
-
if (driver->securityDriver &&
driver->securityDriver->domainSetSavedStateLabel &&
driver->securityDriver->domainSetSavedStateLabel(dom->conn, vm, path) == -1)
@@ -4167,14 +3920,6 @@ static int qemudDomainSave(virDomainPtr dom,
if (rc < 0)
goto endjob;
- if (driver->privileged &&
- chown(path, 0, 0) < 0) {
- virReportSystemError(NULL, errno,
- _("unable to set ownership of '%s' to user %d:%d"),
- path, 0, 0);
- goto endjob;
- }
-
if (driver->securityDriver &&
driver->securityDriver->domainRestoreSavedStateLabel &&
driver->securityDriver->domainRestoreSavedStateLabel(dom->conn, vm, path) == -1)
@@ -4262,14 +4007,6 @@ static int qemudDomainCoreDump(virDomainPtr dom,
goto endjob;
}
- if (driver->privileged &&
- chown(path, driver->user, driver->group) < 0) {
- virReportSystemError(NULL, errno,
- _("unable to set ownership of '%s' to user %d:%d"),
- path, driver->user, driver->group);
- goto endjob;
- }
-
if (driver->securityDriver &&
driver->securityDriver->domainSetSavedStateLabel &&
driver->securityDriver->domainSetSavedStateLabel(dom->conn, vm, path) == -1)
@@ -4297,14 +4034,6 @@ static int qemudDomainCoreDump(virDomainPtr dom,
qemuDomainObjExitMonitor(vm);
paused |= (ret == 0);
- if (driver->privileged &&
- chown(path, 0, 0) < 0) {
- virReportSystemError(NULL, errno,
- _("unable to set ownership of '%s' to user %d:%d"),
- path, 0, 0);
- goto endjob;
- }
-
if (driver->securityDriver &&
driver->securityDriver->domainRestoreSavedStateLabel &&
driver->securityDriver->domainRestoreSavedStateLabel(dom->conn, vm, path) == -1)
@@ -5879,8 +5608,6 @@ static int qemudDomainAttachHostDevice(virConnectPtr conn,
return -1;
}
- if (qemuDomainSetDeviceOwnership(conn, driver, dev, 0) < 0)
- return -1;
if (driver->securityDriver &&
driver->securityDriver->domainSetSecurityHostdevLabel &&
driver->securityDriver->domainSetSecurityHostdevLabel(conn, vm, dev->data.hostdev) < 0)
@@ -5963,9 +5690,6 @@ static int qemudDomainAttachDevice(virDomainPtr dom,
driver->securityDriver->domainSetSecurityImageLabel)
driver->securityDriver->domainSetSecurityImageLabel(dom->conn, vm, dev->data.disk);
- if (qemuDomainSetDeviceOwnership(dom->conn, driver, dev, 0) < 0)
- goto endjob;
-
ret = qemudDomainChangeEjectableMedia(dom->conn, driver, vm, dev);
break;
@@ -5974,9 +5698,6 @@ static int qemudDomainAttachDevice(virDomainPtr dom,
driver->securityDriver->domainSetSecurityImageLabel)
driver->securityDriver->domainSetSecurityImageLabel(dom->conn, vm, dev->data.disk);
- if (qemuDomainSetDeviceOwnership(dom->conn, driver, dev, 0) < 0)
- goto endjob;
-
if (dev->data.disk->bus == VIR_DOMAIN_DISK_BUS_USB) {
ret = qemudDomainAttachUsbMassstorageDevice(dom->conn, driver, vm, dev);
} else if (dev->data.disk->bus == VIR_DOMAIN_DISK_BUS_VIRTIO) {
@@ -6032,11 +5753,8 @@ cleanup:
if (cgroup)
virCgroupFree(&cgroup);
- if (ret < 0 && dev != NULL) {
- if (qemuDomainSetDeviceOwnership(dom->conn, driver, dev, 1) < 0)
- VIR_WARN0("Fail to restore disk device ownership");
+ if (ret < 0 && dev != NULL)
virDomainDeviceDefFree(dev);
- }
if (vm)
virDomainObjUnlock(vm);
qemuDriverUnlock(driver);
@@ -6365,9 +6083,6 @@ static int qemudDomainDetachHostDevice(virConnectPtr conn,
driver->securityDriver->domainSetSecurityHostdevLabel(conn, vm, dev->data.hostdev) < 0)
VIR_WARN0("Failed to restore device labelling");
- if (qemuDomainSetDeviceOwnership(conn, driver, dev, 1) < 0)
- VIR_WARN0("Failed to restore device ownership");
-
return ret;
}
@@ -6410,8 +6125,6 @@ static int qemudDomainDetachDevice(virDomainPtr dom,
if (driver->securityDriver &&
driver->securityDriver->domainRestoreSecurityImageLabel)
driver->securityDriver->domainRestoreSecurityImageLabel(dom->conn, vm, dev->data.disk);
- if (qemuDomainSetDeviceOwnership(dom->conn, driver, dev, 1) < 0)
- VIR_WARN0("Fail to restore disk device ownership");
} else if (dev->type == VIR_DOMAIN_DEVICE_NET) {
ret = qemudDomainDetachNetDevice(dom->conn, driver, vm, dev);
} else if (dev->type == VIR_DOMAIN_DEVICE_CONTROLLER) {
diff --git a/src/qemu/qemu_security_dac.c b/src/qemu/qemu_security_dac.c
index 6b7aab5..623aa55 100644
--- a/src/qemu/qemu_security_dac.c
+++ b/src/qemu/qemu_security_dac.c
@@ -439,7 +439,7 @@ qemuSecurityDACSetProcessLabel(virConnectPtr conn ATTRIBUTE_UNUSED,
-virSecurityDriver virqemuSecurityDACSecurityDriver = {
+virSecurityDriver qemuDACSecurityDriver = {
.name = "qemuDAC",
.domainSetSecurityProcessLabel = qemuSecurityDACSetProcessLabel,
--
1.6.5.2
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