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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.)
159 lines
7.8 KiB
C
159 lines
7.8 KiB
C
/*
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* Copyright (C) 2008, 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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* Authors:
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* James Morris <jmorris@namei.org>
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*
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*/
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#ifndef __VIR_SECURITY_H__
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# define __VIR_SECURITY_H__
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# include "internal.h"
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# include "domain_conf.h"
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# include "security_manager.h"
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/*
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* Return values for security driver probing: the driver will determine
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* whether it should be enabled or disabled.
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*/
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typedef enum {
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SECURITY_DRIVER_ENABLE = 0,
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SECURITY_DRIVER_ERROR = -1,
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SECURITY_DRIVER_DISABLE = -2,
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} virSecurityDriverStatus;
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typedef struct _virSecurityDriver virSecurityDriver;
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typedef virSecurityDriver *virSecurityDriverPtr;
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typedef virSecurityDriverStatus (*virSecurityDriverProbe) (const char *virtDriver);
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typedef int (*virSecurityDriverOpen) (virSecurityManagerPtr mgr);
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typedef int (*virSecurityDriverClose) (virSecurityManagerPtr mgr);
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typedef const char *(*virSecurityDriverGetModel) (virSecurityManagerPtr mgr);
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typedef const char *(*virSecurityDriverGetDOI) (virSecurityManagerPtr mgr);
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typedef int (*virSecurityDomainRestoreImageLabel) (virSecurityManagerPtr mgr,
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virDomainDefPtr def,
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virDomainDiskDefPtr disk);
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typedef int (*virSecurityDomainSetDaemonSocketLabel)(virSecurityManagerPtr mgr,
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virDomainDefPtr vm);
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typedef int (*virSecurityDomainSetSocketLabel) (virSecurityManagerPtr mgr,
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virDomainDefPtr def);
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typedef int (*virSecurityDomainClearSocketLabel)(virSecurityManagerPtr mgr,
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virDomainDefPtr def);
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typedef int (*virSecurityDomainSetImageLabel) (virSecurityManagerPtr mgr,
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virDomainDefPtr def,
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virDomainDiskDefPtr disk);
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typedef int (*virSecurityDomainRestoreHostdevLabel) (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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typedef int (*virSecurityDomainSetHostdevLabel) (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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typedef int (*virSecurityDomainSetSavedStateLabel) (virSecurityManagerPtr mgr,
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virDomainDefPtr def,
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const char *savefile);
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typedef int (*virSecurityDomainRestoreSavedStateLabel) (virSecurityManagerPtr mgr,
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virDomainDefPtr def,
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const char *savefile);
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typedef int (*virSecurityDomainGenLabel) (virSecurityManagerPtr mgr,
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virDomainDefPtr sec);
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typedef int (*virSecurityDomainReserveLabel) (virSecurityManagerPtr mgr,
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virDomainDefPtr sec,
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pid_t pid);
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typedef int (*virSecurityDomainReleaseLabel) (virSecurityManagerPtr mgr,
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virDomainDefPtr sec);
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typedef int (*virSecurityDomainSetAllLabel) (virSecurityManagerPtr mgr,
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virDomainDefPtr sec,
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const char *stdin_path);
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typedef int (*virSecurityDomainRestoreAllLabel) (virSecurityManagerPtr mgr,
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virDomainDefPtr def,
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int migrated);
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typedef int (*virSecurityDomainGetProcessLabel) (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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typedef int (*virSecurityDomainSetProcessLabel) (virSecurityManagerPtr mgr,
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virDomainDefPtr def);
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typedef int (*virSecurityDomainSetChildProcessLabel) (virSecurityManagerPtr mgr,
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virDomainDefPtr def,
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virCommandPtr cmd);
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typedef int (*virSecurityDomainSecurityVerify) (virSecurityManagerPtr mgr,
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virDomainDefPtr def);
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typedef int (*virSecurityDomainSetImageFDLabel) (virSecurityManagerPtr mgr,
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virDomainDefPtr def,
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int fd);
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typedef int (*virSecurityDomainSetTapFDLabel) (virSecurityManagerPtr mgr,
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virDomainDefPtr def,
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int fd);
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typedef char *(*virSecurityDomainGetMountOptions) (virSecurityManagerPtr mgr,
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virDomainDefPtr def);
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typedef int (*virSecurityDomainSetHugepages) (virSecurityManagerPtr mgr,
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virDomainDefPtr def,
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const char *path);
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struct _virSecurityDriver {
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size_t privateDataLen;
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const char *name;
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virSecurityDriverProbe probe;
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virSecurityDriverOpen open;
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virSecurityDriverClose close;
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virSecurityDriverGetModel getModel;
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virSecurityDriverGetDOI getDOI;
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virSecurityDomainSecurityVerify domainSecurityVerify;
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virSecurityDomainSetImageLabel domainSetSecurityImageLabel;
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virSecurityDomainRestoreImageLabel domainRestoreSecurityImageLabel;
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virSecurityDomainSetDaemonSocketLabel domainSetSecurityDaemonSocketLabel;
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virSecurityDomainSetSocketLabel domainSetSecuritySocketLabel;
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virSecurityDomainClearSocketLabel domainClearSecuritySocketLabel;
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virSecurityDomainGenLabel domainGenSecurityLabel;
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virSecurityDomainReserveLabel domainReserveSecurityLabel;
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virSecurityDomainReleaseLabel domainReleaseSecurityLabel;
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virSecurityDomainGetProcessLabel domainGetSecurityProcessLabel;
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virSecurityDomainSetProcessLabel domainSetSecurityProcessLabel;
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virSecurityDomainSetChildProcessLabel domainSetSecurityChildProcessLabel;
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virSecurityDomainSetAllLabel domainSetSecurityAllLabel;
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virSecurityDomainRestoreAllLabel domainRestoreSecurityAllLabel;
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virSecurityDomainSetHostdevLabel domainSetSecurityHostdevLabel;
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virSecurityDomainRestoreHostdevLabel domainRestoreSecurityHostdevLabel;
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virSecurityDomainSetSavedStateLabel domainSetSavedStateLabel;
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virSecurityDomainRestoreSavedStateLabel domainRestoreSavedStateLabel;
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virSecurityDomainSetImageFDLabel domainSetSecurityImageFDLabel;
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virSecurityDomainSetTapFDLabel domainSetSecurityTapFDLabel;
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virSecurityDomainGetMountOptions domainGetSecurityMountOptions;
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virSecurityDomainSetHugepages domainSetSecurityHugepages;
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};
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virSecurityDriverPtr virSecurityDriverLookup(const char *name,
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const char *virtDriver);
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#endif /* __VIR_SECURITY_H__ */
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