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The existing virSecurityManagerSetProcessLabel() API is designed so that it must be called after forking the child process, but before exec'ing the child. Due to the way the virCommand API works, that means it needs to be put in a "hook" function that virCommand is told to call out to at that time. Setting the child process label is a basic enough need when executing any process that virCommand should have a method of doing that. But virCommand must be told what label to set, and only the security driver knows the answer to that question. The new virSecurityManagerSet*Child*ProcessLabel() API is the way to transfer the knowledge about what label to set from the security driver to the virCommand object. It is given a virCommandPtr, and each security driver calls the appropriate virCommand* API to tell virCommand what to do between fork and exec. 1) in the case of the DAC security driver, it calls virCommandSetUID/GID() to set a uid and gid that must be set for the child process. 2) for the SELinux security driver, it calls virCommandSetSELinuxLabel() to save a copy of the char* that will be sent to setexeccon_raw() *after forking the child process*. 3) for the AppArmor security drivers, it calls virCommandSetAppArmorProfile() to save a copy of the char* that will be sent to aa_change_profile() *after forking the child process*. With this new API in place, we will be able to remove virSecurityManagerSetProcessLabel() from any virCommand pre-exec hooks. (Unfortunately, the LXC driver uses clone() rather than virCommand, so it can't take advantage of this new security driver API, meaning that we need to keep around the older virSecurityManagerSetProcessLabel(), at least for now.)
127 lines
6.4 KiB
C
127 lines
6.4 KiB
C
/*
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* security_manager.h: Internal security manager API
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*
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* Copyright (C) 2010-2013 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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* Author: Daniel P. Berrange <berrange@redhat.com>
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*/
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#ifndef VIR_SECURITY_MANAGER_H__
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# define VIR_SECURITY_MANAGER_H__
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# include "domain_conf.h"
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# include "vircommand.h"
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typedef struct _virSecurityManager virSecurityManager;
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typedef virSecurityManager *virSecurityManagerPtr;
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virSecurityManagerPtr virSecurityManagerNew(const char *name,
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const char *virtDriver,
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bool allowDiskFormatProbing,
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bool defaultConfined,
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bool requireConfined);
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virSecurityManagerPtr virSecurityManagerNewStack(virSecurityManagerPtr primary);
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int virSecurityManagerStackAddNested(virSecurityManagerPtr stack,
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virSecurityManagerPtr nested);
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virSecurityManagerPtr virSecurityManagerNewDAC(const char *virtDriver,
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uid_t user,
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gid_t group,
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bool allowDiskFormatProbing,
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bool defaultConfined,
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bool requireConfined,
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bool dynamicOwnership);
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void virSecurityManagerPreFork(virSecurityManagerPtr mgr);
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void virSecurityManagerPostFork(virSecurityManagerPtr mgr);
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void *virSecurityManagerGetPrivateData(virSecurityManagerPtr mgr);
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const char *virSecurityManagerGetDriver(virSecurityManagerPtr mgr);
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const char *virSecurityManagerGetDOI(virSecurityManagerPtr mgr);
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const char *virSecurityManagerGetModel(virSecurityManagerPtr mgr);
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bool virSecurityManagerGetAllowDiskFormatProbing(virSecurityManagerPtr mgr);
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bool virSecurityManagerGetDefaultConfined(virSecurityManagerPtr mgr);
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bool virSecurityManagerGetRequireConfined(virSecurityManagerPtr mgr);
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int virSecurityManagerRestoreImageLabel(virSecurityManagerPtr mgr,
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virDomainDefPtr def,
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virDomainDiskDefPtr disk);
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int virSecurityManagerSetDaemonSocketLabel(virSecurityManagerPtr mgr,
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virDomainDefPtr vm);
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int virSecurityManagerSetSocketLabel(virSecurityManagerPtr mgr,
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virDomainDefPtr def);
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int virSecurityManagerClearSocketLabel(virSecurityManagerPtr mgr,
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virDomainDefPtr def);
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int virSecurityManagerSetImageLabel(virSecurityManagerPtr mgr,
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virDomainDefPtr def,
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virDomainDiskDefPtr disk);
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int virSecurityManagerRestoreHostdevLabel(virSecurityManagerPtr mgr,
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virDomainDefPtr def,
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virDomainHostdevDefPtr dev,
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const char *vroot);
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int virSecurityManagerSetHostdevLabel(virSecurityManagerPtr mgr,
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virDomainDefPtr def,
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virDomainHostdevDefPtr dev,
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const char *vroot);
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int virSecurityManagerSetSavedStateLabel(virSecurityManagerPtr mgr,
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virDomainDefPtr def,
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const char *savefile);
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int virSecurityManagerRestoreSavedStateLabel(virSecurityManagerPtr mgr,
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virDomainDefPtr def,
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const char *savefile);
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int virSecurityManagerGenLabel(virSecurityManagerPtr mgr,
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virDomainDefPtr sec);
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int virSecurityManagerReserveLabel(virSecurityManagerPtr mgr,
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virDomainDefPtr sec,
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pid_t pid);
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int virSecurityManagerReleaseLabel(virSecurityManagerPtr mgr,
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virDomainDefPtr sec);
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int virSecurityManagerSetAllLabel(virSecurityManagerPtr mgr,
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virDomainDefPtr sec,
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const char *stdin_path);
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int virSecurityManagerRestoreAllLabel(virSecurityManagerPtr mgr,
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virDomainDefPtr def,
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int migrated);
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int virSecurityManagerGetProcessLabel(virSecurityManagerPtr mgr,
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virDomainDefPtr def,
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pid_t pid,
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virSecurityLabelPtr sec);
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int virSecurityManagerSetProcessLabel(virSecurityManagerPtr mgr,
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virDomainDefPtr def);
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int virSecurityManagerSetChildProcessLabel(virSecurityManagerPtr mgr,
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virDomainDefPtr def,
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virCommandPtr cmd);
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int virSecurityManagerVerify(virSecurityManagerPtr mgr,
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virDomainDefPtr def);
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int virSecurityManagerSetImageFDLabel(virSecurityManagerPtr mgr,
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virDomainDefPtr def,
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int fd);
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int virSecurityManagerSetTapFDLabel(virSecurityManagerPtr mgr,
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virDomainDefPtr vm,
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int fd);
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char *virSecurityManagerGetMountOptions(virSecurityManagerPtr mgr,
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virDomainDefPtr vm);
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virSecurityManagerPtr*
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virSecurityManagerGetNested(virSecurityManagerPtr mgr);
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int virSecurityManagerSetHugepages(virSecurityManagerPtr mgr,
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virDomainDefPtr sec,
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const char *hugepages_path);
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#endif /* VIR_SECURITY_MANAGER_H__ */
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