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a2f0b97ab7
When metadata locking is enabled that means the security commit processing will be run in a fork similar to how namespaces use fork()'s for processing. This is done to ensure libvirt can properly and synchronously modify the metadata to store the original owner data. Since fork()'s (e.g. virFork) have been seen as a performance bottleneck being able to disable them allows the admin to choose whether the performance 'hit' is worth the extra 'security' of being able to remember the original owner of a lock. Signed-off-by: Michal Privoznik <mprivozn@redhat.com> Reviewed-by: John Ferlan <jferlan@redhat.com>
672 lines
20 KiB
C
672 lines
20 KiB
C
/*
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* qemu_security.c: QEMU security management
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*
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* Copyright (C) 2016 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see
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* <http://www.gnu.org/licenses/>.
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*
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* Authors:
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* Michal Privoznik <mprivozn@redhat.com>
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*/
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#include <config.h>
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#include "qemu_domain.h"
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#include "qemu_security.h"
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#include "virlog.h"
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#define VIR_FROM_THIS VIR_FROM_QEMU
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VIR_LOG_INIT("qemu.qemu_process");
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int
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qemuSecuritySetAllLabel(virQEMUDriverPtr driver,
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virDomainObjPtr vm,
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const char *stdin_path)
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{
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int ret = -1;
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qemuDomainObjPrivatePtr priv = vm->privateData;
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pid_t pid = -1;
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if (qemuDomainNamespaceEnabled(vm, QEMU_DOMAIN_NS_MOUNT))
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pid = vm->pid;
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if (virSecurityManagerTransactionStart(driver->securityManager) < 0)
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goto cleanup;
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if (virSecurityManagerSetAllLabel(driver->securityManager,
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vm->def,
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stdin_path,
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priv->chardevStdioLogd) < 0)
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goto cleanup;
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if (virSecurityManagerTransactionCommit(driver->securityManager,
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pid, priv->rememberOwner) < 0)
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goto cleanup;
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ret = 0;
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cleanup:
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virSecurityManagerTransactionAbort(driver->securityManager);
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return ret;
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}
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void
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qemuSecurityRestoreAllLabel(virQEMUDriverPtr driver,
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virDomainObjPtr vm,
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bool migrated)
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{
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qemuDomainObjPrivatePtr priv = vm->privateData;
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bool transactionStarted = false;
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/* In contrast to qemuSecuritySetAllLabel, do not use vm->pid
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* here. This function is called from qemuProcessStop() which
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* is meant to do cleanup after qemu process died. The
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* domain's namespace is gone as qemu was the only process
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* running there. We would not succeed in entering the
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* namespace then. */
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if (virSecurityManagerTransactionStart(driver->securityManager) >= 0)
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transactionStarted = true;
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virSecurityManagerRestoreAllLabel(driver->securityManager,
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vm->def,
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migrated,
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priv->chardevStdioLogd);
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if (transactionStarted &&
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virSecurityManagerTransactionCommit(driver->securityManager,
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-1, priv->rememberOwner) < 0)
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VIR_WARN("Unable to run security manager transaction");
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virSecurityManagerTransactionAbort(driver->securityManager);
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}
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int
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qemuSecuritySetDiskLabel(virQEMUDriverPtr driver,
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virDomainObjPtr vm,
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virDomainDiskDefPtr disk)
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{
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qemuDomainObjPrivatePtr priv = vm->privateData;
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pid_t pid = -1;
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int ret = -1;
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if (qemuDomainNamespaceEnabled(vm, QEMU_DOMAIN_NS_MOUNT))
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pid = vm->pid;
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if (virSecurityManagerTransactionStart(driver->securityManager) < 0)
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goto cleanup;
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if (virSecurityManagerSetDiskLabel(driver->securityManager,
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vm->def,
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disk) < 0)
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goto cleanup;
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if (virSecurityManagerTransactionCommit(driver->securityManager,
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pid, priv->rememberOwner) < 0)
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goto cleanup;
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ret = 0;
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cleanup:
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virSecurityManagerTransactionAbort(driver->securityManager);
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return ret;
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}
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int
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qemuSecurityRestoreDiskLabel(virQEMUDriverPtr driver,
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virDomainObjPtr vm,
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virDomainDiskDefPtr disk)
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{
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qemuDomainObjPrivatePtr priv = vm->privateData;
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pid_t pid = -1;
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int ret = -1;
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if (qemuDomainNamespaceEnabled(vm, QEMU_DOMAIN_NS_MOUNT))
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pid = vm->pid;
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if (virSecurityManagerTransactionStart(driver->securityManager) < 0)
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goto cleanup;
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if (virSecurityManagerRestoreDiskLabel(driver->securityManager,
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vm->def,
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disk) < 0)
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goto cleanup;
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if (virSecurityManagerTransactionCommit(driver->securityManager,
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pid, priv->rememberOwner) < 0)
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goto cleanup;
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ret = 0;
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cleanup:
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virSecurityManagerTransactionAbort(driver->securityManager);
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return ret;
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}
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int
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qemuSecuritySetImageLabel(virQEMUDriverPtr driver,
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virDomainObjPtr vm,
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virStorageSourcePtr src)
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{
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qemuDomainObjPrivatePtr priv = vm->privateData;
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pid_t pid = -1;
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int ret = -1;
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if (qemuDomainNamespaceEnabled(vm, QEMU_DOMAIN_NS_MOUNT))
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pid = vm->pid;
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if (virSecurityManagerTransactionStart(driver->securityManager) < 0)
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goto cleanup;
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if (virSecurityManagerSetImageLabel(driver->securityManager,
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vm->def,
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src) < 0)
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goto cleanup;
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if (virSecurityManagerTransactionCommit(driver->securityManager,
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pid, priv->rememberOwner) < 0)
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goto cleanup;
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ret = 0;
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cleanup:
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virSecurityManagerTransactionAbort(driver->securityManager);
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return ret;
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}
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int
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qemuSecurityRestoreImageLabel(virQEMUDriverPtr driver,
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virDomainObjPtr vm,
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virStorageSourcePtr src)
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{
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qemuDomainObjPrivatePtr priv = vm->privateData;
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pid_t pid = -1;
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int ret = -1;
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if (qemuDomainNamespaceEnabled(vm, QEMU_DOMAIN_NS_MOUNT))
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pid = vm->pid;
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if (virSecurityManagerTransactionStart(driver->securityManager) < 0)
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goto cleanup;
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if (virSecurityManagerRestoreImageLabel(driver->securityManager,
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vm->def,
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src) < 0)
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goto cleanup;
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if (virSecurityManagerTransactionCommit(driver->securityManager,
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pid, priv->rememberOwner) < 0)
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goto cleanup;
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ret = 0;
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cleanup:
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virSecurityManagerTransactionAbort(driver->securityManager);
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return ret;
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}
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int
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qemuSecuritySetHostdevLabel(virQEMUDriverPtr driver,
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virDomainObjPtr vm,
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virDomainHostdevDefPtr hostdev)
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{
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qemuDomainObjPrivatePtr priv = vm->privateData;
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pid_t pid = -1;
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int ret = -1;
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if (qemuDomainNamespaceEnabled(vm, QEMU_DOMAIN_NS_MOUNT))
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pid = vm->pid;
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if (virSecurityManagerTransactionStart(driver->securityManager) < 0)
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goto cleanup;
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if (virSecurityManagerSetHostdevLabel(driver->securityManager,
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vm->def,
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hostdev,
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NULL) < 0)
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goto cleanup;
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if (virSecurityManagerTransactionCommit(driver->securityManager,
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pid, priv->rememberOwner) < 0)
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goto cleanup;
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ret = 0;
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cleanup:
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virSecurityManagerTransactionAbort(driver->securityManager);
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return ret;
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}
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int
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qemuSecurityRestoreHostdevLabel(virQEMUDriverPtr driver,
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virDomainObjPtr vm,
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virDomainHostdevDefPtr hostdev)
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{
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qemuDomainObjPrivatePtr priv = vm->privateData;
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pid_t pid = -1;
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int ret = -1;
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if (qemuDomainNamespaceEnabled(vm, QEMU_DOMAIN_NS_MOUNT))
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pid = vm->pid;
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if (virSecurityManagerTransactionStart(driver->securityManager) < 0)
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goto cleanup;
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if (virSecurityManagerRestoreHostdevLabel(driver->securityManager,
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vm->def,
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hostdev,
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NULL) < 0)
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goto cleanup;
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if (virSecurityManagerTransactionCommit(driver->securityManager,
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pid, priv->rememberOwner) < 0)
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goto cleanup;
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ret = 0;
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cleanup:
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virSecurityManagerTransactionAbort(driver->securityManager);
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return ret;
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}
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int
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qemuSecuritySetMemoryLabel(virQEMUDriverPtr driver,
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virDomainObjPtr vm,
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virDomainMemoryDefPtr mem)
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{
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qemuDomainObjPrivatePtr priv = vm->privateData;
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pid_t pid = -1;
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int ret = -1;
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if (qemuDomainNamespaceEnabled(vm, QEMU_DOMAIN_NS_MOUNT))
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pid = vm->pid;
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if (virSecurityManagerTransactionStart(driver->securityManager) < 0)
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goto cleanup;
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if (virSecurityManagerSetMemoryLabel(driver->securityManager,
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vm->def,
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mem) < 0)
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goto cleanup;
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if (virSecurityManagerTransactionCommit(driver->securityManager,
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pid, priv->rememberOwner) < 0)
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goto cleanup;
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ret = 0;
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cleanup:
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virSecurityManagerTransactionAbort(driver->securityManager);
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return ret;
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}
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int
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qemuSecurityRestoreMemoryLabel(virQEMUDriverPtr driver,
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virDomainObjPtr vm,
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virDomainMemoryDefPtr mem)
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{
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qemuDomainObjPrivatePtr priv = vm->privateData;
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pid_t pid = -1;
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int ret = -1;
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if (qemuDomainNamespaceEnabled(vm, QEMU_DOMAIN_NS_MOUNT))
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pid = vm->pid;
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if (virSecurityManagerTransactionStart(driver->securityManager) < 0)
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goto cleanup;
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if (virSecurityManagerRestoreMemoryLabel(driver->securityManager,
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vm->def,
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mem) < 0)
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goto cleanup;
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if (virSecurityManagerTransactionCommit(driver->securityManager,
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pid, priv->rememberOwner) < 0)
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goto cleanup;
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ret = 0;
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cleanup:
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virSecurityManagerTransactionAbort(driver->securityManager);
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return ret;
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}
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int
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qemuSecuritySetInputLabel(virDomainObjPtr vm,
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virDomainInputDefPtr input)
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{
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qemuDomainObjPrivatePtr priv = vm->privateData;
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virQEMUDriverPtr driver = priv->driver;
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pid_t pid = -1;
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int ret = -1;
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if (qemuDomainNamespaceEnabled(vm, QEMU_DOMAIN_NS_MOUNT))
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pid = vm->pid;
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if (virSecurityManagerTransactionStart(driver->securityManager) < 0)
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goto cleanup;
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if (virSecurityManagerSetInputLabel(driver->securityManager,
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vm->def,
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input) < 0)
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goto cleanup;
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if (virSecurityManagerTransactionCommit(driver->securityManager,
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pid, priv->rememberOwner) < 0)
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goto cleanup;
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ret = 0;
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cleanup:
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virSecurityManagerTransactionAbort(driver->securityManager);
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return ret;
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}
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int
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qemuSecurityRestoreInputLabel(virDomainObjPtr vm,
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virDomainInputDefPtr input)
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{
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qemuDomainObjPrivatePtr priv = vm->privateData;
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virQEMUDriverPtr driver = priv->driver;
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pid_t pid = -1;
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int ret = -1;
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if (qemuDomainNamespaceEnabled(vm, QEMU_DOMAIN_NS_MOUNT))
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pid = vm->pid;
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if (virSecurityManagerTransactionStart(driver->securityManager) < 0)
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goto cleanup;
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if (virSecurityManagerRestoreInputLabel(driver->securityManager,
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vm->def,
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input) < 0)
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goto cleanup;
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if (virSecurityManagerTransactionCommit(driver->securityManager,
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pid, priv->rememberOwner) < 0)
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goto cleanup;
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ret = 0;
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cleanup:
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virSecurityManagerTransactionAbort(driver->securityManager);
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return ret;
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}
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int
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qemuSecuritySetChardevLabel(virQEMUDriverPtr driver,
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virDomainObjPtr vm,
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virDomainChrDefPtr chr)
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{
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int ret = -1;
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qemuDomainObjPrivatePtr priv = vm->privateData;
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pid_t pid = -1;
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if (qemuDomainNamespaceEnabled(vm, QEMU_DOMAIN_NS_MOUNT))
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pid = vm->pid;
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if (virSecurityManagerTransactionStart(driver->securityManager) < 0)
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goto cleanup;
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if (virSecurityManagerSetChardevLabel(driver->securityManager,
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vm->def,
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chr->source,
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priv->chardevStdioLogd) < 0)
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goto cleanup;
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if (virSecurityManagerTransactionCommit(driver->securityManager,
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pid, priv->rememberOwner) < 0)
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goto cleanup;
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ret = 0;
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cleanup:
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virSecurityManagerTransactionAbort(driver->securityManager);
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return ret;
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}
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int
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qemuSecurityRestoreChardevLabel(virQEMUDriverPtr driver,
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virDomainObjPtr vm,
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virDomainChrDefPtr chr)
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{
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int ret = -1;
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qemuDomainObjPrivatePtr priv = vm->privateData;
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pid_t pid = -1;
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if (qemuDomainNamespaceEnabled(vm, QEMU_DOMAIN_NS_MOUNT))
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pid = vm->pid;
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if (virSecurityManagerTransactionStart(driver->securityManager) < 0)
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goto cleanup;
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if (virSecurityManagerRestoreChardevLabel(driver->securityManager,
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vm->def,
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chr->source,
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priv->chardevStdioLogd) < 0)
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goto cleanup;
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if (virSecurityManagerTransactionCommit(driver->securityManager,
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pid, priv->rememberOwner) < 0)
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goto cleanup;
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ret = 0;
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cleanup:
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virSecurityManagerTransactionAbort(driver->securityManager);
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return ret;
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}
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/*
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* qemuSecurityStartTPMEmulator:
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*
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* @driver: the QEMU driver
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* @vm: the domain object
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* @cmd: the command to run
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* @uid: the uid to run the emulator
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* @gid: the gid to run the emulator
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* @existstatus: pointer to int returning exit status of process
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* @cmdret: pointer to int returning result of virCommandRun
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*
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* Start the TPM emulator with approriate labels. Apply security
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* labels to files first.
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* This function returns -1 on security setup error, 0 if all the
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* setup was done properly. In case the virCommand failed to run
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* 0 is returned but cmdret is set appropriately with the process
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* exitstatus also set.
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*/
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int
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qemuSecurityStartTPMEmulator(virQEMUDriverPtr driver,
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virDomainObjPtr vm,
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virCommandPtr cmd,
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uid_t uid,
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gid_t gid,
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int *exitstatus,
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int *cmdret)
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{
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qemuDomainObjPrivatePtr priv = vm->privateData;
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int ret = -1;
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bool transactionStarted = false;
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if (virSecurityManagerTransactionStart(driver->securityManager) < 0)
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return -1;
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transactionStarted = true;
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if (virSecurityManagerSetTPMLabels(driver->securityManager,
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vm->def) < 0) {
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virSecurityManagerTransactionAbort(driver->securityManager);
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return -1;
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}
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if (virSecurityManagerTransactionCommit(driver->securityManager,
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-1, priv->rememberOwner) < 0)
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goto cleanup;
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transactionStarted = false;
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if (virSecurityManagerSetChildProcessLabel(driver->securityManager,
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vm->def, cmd) < 0)
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goto cleanup;
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if (virSecurityManagerPreFork(driver->securityManager) < 0)
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goto cleanup;
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ret = 0;
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/* make sure we run this with the appropriate user */
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virCommandSetUID(cmd, uid);
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virCommandSetGID(cmd, gid);
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*cmdret = virCommandRun(cmd, exitstatus);
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virSecurityManagerPostFork(driver->securityManager);
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if (*cmdret < 0)
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goto cleanup;
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return 0;
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cleanup:
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if (!transactionStarted &&
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virSecurityManagerTransactionStart(driver->securityManager) >= 0)
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transactionStarted = true;
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virSecurityManagerRestoreTPMLabels(driver->securityManager, vm->def);
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if (transactionStarted &&
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virSecurityManagerTransactionCommit(driver->securityManager,
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-1, priv->rememberOwner) < 0)
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VIR_WARN("Unable to run security manager transaction");
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virSecurityManagerTransactionAbort(driver->securityManager);
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return ret;
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}
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|
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|
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void
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qemuSecurityCleanupTPMEmulator(virQEMUDriverPtr driver,
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virDomainObjPtr vm)
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{
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qemuDomainObjPrivatePtr priv = vm->privateData;
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bool transactionStarted = false;
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|
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if (virSecurityManagerTransactionStart(driver->securityManager) >= 0)
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transactionStarted = true;
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virSecurityManagerRestoreTPMLabels(driver->securityManager, vm->def);
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|
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if (transactionStarted &&
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virSecurityManagerTransactionCommit(driver->securityManager,
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-1, priv->rememberOwner) < 0)
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VIR_WARN("Unable to run security manager transaction");
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|
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virSecurityManagerTransactionAbort(driver->securityManager);
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}
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|
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|
|
int
|
|
qemuSecurityDomainSetPathLabel(virQEMUDriverPtr driver,
|
|
virDomainObjPtr vm,
|
|
const char *path,
|
|
bool allowSubtree)
|
|
{
|
|
qemuDomainObjPrivatePtr priv = vm->privateData;
|
|
pid_t pid = -1;
|
|
int ret = -1;
|
|
|
|
if (qemuDomainNamespaceEnabled(vm, QEMU_DOMAIN_NS_MOUNT))
|
|
pid = vm->pid;
|
|
|
|
if (virSecurityManagerTransactionStart(driver->securityManager) < 0)
|
|
goto cleanup;
|
|
|
|
if (virSecurityManagerDomainSetPathLabel(driver->securityManager,
|
|
vm->def,
|
|
path,
|
|
allowSubtree) < 0)
|
|
goto cleanup;
|
|
|
|
if (virSecurityManagerTransactionCommit(driver->securityManager,
|
|
pid, priv->rememberOwner) < 0)
|
|
goto cleanup;
|
|
|
|
ret = 0;
|
|
cleanup:
|
|
virSecurityManagerTransactionAbort(driver->securityManager);
|
|
return ret;
|
|
}
|
|
|
|
|
|
int
|
|
qemuSecuritySetSavedStateLabel(virQEMUDriverPtr driver,
|
|
virDomainObjPtr vm,
|
|
const char *savefile)
|
|
{
|
|
qemuDomainObjPrivatePtr priv = vm->privateData;
|
|
pid_t pid = -1;
|
|
int ret = -1;
|
|
|
|
if (qemuDomainNamespaceEnabled(vm, QEMU_DOMAIN_NS_MOUNT))
|
|
pid = vm->pid;
|
|
|
|
if (virSecurityManagerTransactionStart(driver->securityManager) < 0)
|
|
goto cleanup;
|
|
|
|
if (virSecurityManagerSetSavedStateLabel(driver->securityManager,
|
|
vm->def,
|
|
savefile) < 0)
|
|
goto cleanup;
|
|
|
|
if (virSecurityManagerTransactionCommit(driver->securityManager,
|
|
pid, priv->rememberOwner) < 0)
|
|
goto cleanup;
|
|
|
|
ret = 0;
|
|
cleanup:
|
|
virSecurityManagerTransactionAbort(driver->securityManager);
|
|
return ret;
|
|
}
|
|
|
|
|
|
int
|
|
qemuSecurityRestoreSavedStateLabel(virQEMUDriverPtr driver,
|
|
virDomainObjPtr vm,
|
|
const char *savefile)
|
|
{
|
|
qemuDomainObjPrivatePtr priv = vm->privateData;
|
|
pid_t pid = -1;
|
|
int ret = -1;
|
|
|
|
if (qemuDomainNamespaceEnabled(vm, QEMU_DOMAIN_NS_MOUNT))
|
|
pid = vm->pid;
|
|
|
|
if (virSecurityManagerTransactionStart(driver->securityManager) < 0)
|
|
goto cleanup;
|
|
|
|
if (virSecurityManagerRestoreSavedStateLabel(driver->securityManager,
|
|
vm->def,
|
|
savefile) < 0)
|
|
goto cleanup;
|
|
|
|
if (virSecurityManagerTransactionCommit(driver->securityManager,
|
|
pid, priv->rememberOwner) < 0)
|
|
goto cleanup;
|
|
|
|
ret = 0;
|
|
cleanup:
|
|
virSecurityManagerTransactionAbort(driver->securityManager);
|
|
return ret;
|
|
}
|