mirror of
https://gitlab.com/libvirt/libvirt.git
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security: Label the external swtpm with SELinux labels
In this patch we label the swtpm process with SELinux labels. We give it the same label as the QEMU process has. We label its state directory and files as well. We restore the old security labels once the swtpm has terminated. The file and process labels now look as follows: Directory: /var/lib/libvirt/swtpm [root@localhost swtpm]# ls -lZ total 4 rwx------. 2 tss tss system_u:object_r:svirt_image_t:s0:c254,c932 4096 Apr 5 16:46 testvm [root@localhost testvm]# ls -lZ total 8 -rw-r--r--. 1 tss tss system_u:object_r:svirt_image_t:s0:c254,c932 3648 Apr 5 16:46 tpm-00.permall The log in /var/log/swtpm/libvirt/qemu is labeled as follows: -rw-r--r--. 1 tss tss system_u:object_r:svirt_image_t:s0:c254,c932 2237 Apr 5 16:46 vtpm.log [root@localhost 485d0004-a48f-436a-8457-8a3b73e28567]# ps auxZ | grep swtpm | grep ctrl | grep -v grep system_u:system_r:svirt_t:s0:c254,c932 tss 25664 0.0 0.0 28172 3892 ? Ss 16:57 0:00 /usr/bin/swtpm socket --daemon --ctrl type=unixio,path=/var/run/libvirt/qemu/swtpm/testvm-swtpm.sock,mode=0660 --tpmstate dir=/var/lib/libvirt/swtpm/testvm/tpm1.2 --log file=/var/log/swtpm/libvirt/qemu/testvm-swtpm.log [root@localhost 485d0004-a48f-436a-8457-8a3b73e28567]# ps auxZ | grep qemu | grep tpm | grep -v grep system_u:system_r:svirt_t:s0:c254,c932 qemu 25669 99.0 0.0 3096704 48500 ? Sl 16:57 3:28 /bin/qemu-system-x86_64 [..] Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com> Reviewed-by: John Ferlan <jferlan@redhat.com> Reviewed-by: Ján Tomko <jtomko@redhat.com>
This commit is contained in:
parent
f264df2d9e
commit
2fc665bb11
@ -1326,6 +1326,7 @@ virSecurityManagerRestoreImageLabel;
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virSecurityManagerRestoreInputLabel;
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virSecurityManagerRestoreInputLabel;
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virSecurityManagerRestoreMemoryLabel;
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virSecurityManagerRestoreMemoryLabel;
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virSecurityManagerRestoreSavedStateLabel;
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virSecurityManagerRestoreSavedStateLabel;
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virSecurityManagerRestoreTPMLabels;
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virSecurityManagerSetAllLabel;
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virSecurityManagerSetAllLabel;
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virSecurityManagerSetChardevLabel;
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virSecurityManagerSetChardevLabel;
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virSecurityManagerSetChildProcessLabel;
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virSecurityManagerSetChildProcessLabel;
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@ -1340,6 +1341,7 @@ virSecurityManagerSetProcessLabel;
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virSecurityManagerSetSavedStateLabel;
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virSecurityManagerSetSavedStateLabel;
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virSecurityManagerSetSocketLabel;
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virSecurityManagerSetSocketLabel;
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virSecurityManagerSetTapFDLabel;
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virSecurityManagerSetTapFDLabel;
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virSecurityManagerSetTPMLabels;
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virSecurityManagerStackAddNested;
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virSecurityManagerStackAddNested;
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virSecurityManagerTransactionAbort;
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virSecurityManagerTransactionAbort;
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virSecurityManagerTransactionCommit;
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virSecurityManagerTransactionCommit;
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@ -424,3 +424,72 @@ qemuSecurityRestoreChardevLabel(virQEMUDriverPtr driver,
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virSecurityManagerTransactionAbort(driver->securityManager);
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virSecurityManagerTransactionAbort(driver->securityManager);
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return ret;
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return ret;
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}
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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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* @def: the domain definition
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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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virDomainDefPtr def,
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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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int ret = -1;
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if (virSecurityManagerSetTPMLabels(driver->securityManager,
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def) < 0)
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goto cleanup;
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if (virSecurityManagerSetChildProcessLabel(driver->securityManager,
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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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virSecurityManagerRestoreTPMLabels(driver->securityManager, def);
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return ret;
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}
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void
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qemuSecurityCleanupTPMEmulator(virQEMUDriverPtr driver,
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virDomainDefPtr def)
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{
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virSecurityManagerRestoreTPMLabels(driver->securityManager, def);
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}
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@ -84,6 +84,17 @@ int qemuSecurityRestoreChardevLabel(virQEMUDriverPtr driver,
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virDomainObjPtr vm,
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virDomainObjPtr vm,
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virDomainChrDefPtr chr);
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virDomainChrDefPtr chr);
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int qemuSecurityStartTPMEmulator(virQEMUDriverPtr driver,
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virDomainDefPtr def,
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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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void qemuSecurityCleanupTPMEmulator(virQEMUDriverPtr driver,
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virDomainDefPtr def);
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/* Please note that for these APIs there is no wrapper yet. Do NOT blindly add
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/* Please note that for these APIs there is no wrapper yet. Do NOT blindly add
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* new APIs here. If an API can touch a /dev file add a proper wrapper instead.
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* new APIs here. If an API can touch a /dev file add a proper wrapper instead.
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*/
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*/
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@ -29,6 +29,7 @@
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#include "qemu_extdevice.h"
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#include "qemu_extdevice.h"
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#include "qemu_domain.h"
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#include "qemu_domain.h"
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#include "qemu_security.h"
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#include "conf/domain_conf.h"
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#include "conf/domain_conf.h"
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#include "vircommand.h"
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#include "vircommand.h"
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@ -654,11 +655,12 @@ qemuExtTPMStartEmulator(virQEMUDriverPtr driver,
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{
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{
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int ret = -1;
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int ret = -1;
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virCommandPtr cmd = NULL;
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virCommandPtr cmd = NULL;
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int exitstatus;
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int exitstatus = 0;
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char *errbuf = NULL;
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char *errbuf = NULL;
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virQEMUDriverConfigPtr cfg;
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virQEMUDriverConfigPtr cfg;
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virDomainTPMDefPtr tpm = def->tpm;
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virDomainTPMDefPtr tpm = def->tpm;
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char *shortName = virDomainDefGetShortName(def);
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char *shortName = virDomainDefGetShortName(def);
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int cmdret = 0;
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if (!shortName)
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if (!shortName)
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return -1;
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return -1;
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@ -679,7 +681,12 @@ qemuExtTPMStartEmulator(virQEMUDriverPtr driver,
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virCommandSetErrorBuffer(cmd, &errbuf);
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virCommandSetErrorBuffer(cmd, &errbuf);
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if (virCommandRun(cmd, &exitstatus) < 0 || exitstatus != 0) {
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if (qemuSecurityStartTPMEmulator(driver, def, cmd,
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cfg->swtpm_user, cfg->swtpm_group,
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&exitstatus, &cmdret) < 0)
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goto cleanup;
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if (cmdret < 0 || exitstatus != 0) {
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virReportError(VIR_ERR_INTERNAL_ERROR,
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virReportError(VIR_ERR_INTERNAL_ERROR,
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_("Could not start 'swtpm'. exitstatus: %d, "
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_("Could not start 'swtpm'. exitstatus: %d, "
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"error: %s"), exitstatus, errbuf);
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"error: %s"), exitstatus, errbuf);
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@ -734,6 +741,7 @@ qemuExtTPMStop(virQEMUDriverPtr driver,
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goto cleanup;
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goto cleanup;
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qemuTPMEmulatorStop(cfg->swtpmStateDir, shortName);
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qemuTPMEmulatorStop(cfg->swtpmStateDir, shortName);
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qemuSecurityCleanupTPMEmulator(driver, def);
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break;
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break;
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case VIR_DOMAIN_TPM_TYPE_PASSTHROUGH:
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case VIR_DOMAIN_TPM_TYPE_PASSTHROUGH:
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case VIR_DOMAIN_TPM_TYPE_LAST:
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case VIR_DOMAIN_TPM_TYPE_LAST:
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@ -149,6 +149,10 @@ typedef int (*virSecurityDomainRestoreChardevLabel) (virSecurityManagerPtr mgr,
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virDomainDefPtr def,
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virDomainDefPtr def,
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virDomainChrSourceDefPtr dev_source,
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virDomainChrSourceDefPtr dev_source,
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bool chardevStdioLogd);
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bool chardevStdioLogd);
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typedef int (*virSecurityDomainSetTPMLabels) (virSecurityManagerPtr mgr,
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virDomainDefPtr def);
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typedef int (*virSecurityDomainRestoreTPMLabels) (virSecurityManagerPtr mgr,
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virDomainDefPtr def);
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struct _virSecurityDriver {
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struct _virSecurityDriver {
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@ -213,6 +217,9 @@ struct _virSecurityDriver {
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virSecurityDomainSetChardevLabel domainSetSecurityChardevLabel;
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virSecurityDomainSetChardevLabel domainSetSecurityChardevLabel;
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virSecurityDomainRestoreChardevLabel domainRestoreSecurityChardevLabel;
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virSecurityDomainRestoreChardevLabel domainRestoreSecurityChardevLabel;
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virSecurityDomainSetTPMLabels domainSetSecurityTPMLabels;
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virSecurityDomainRestoreTPMLabels domainRestoreSecurityTPMLabels;
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};
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};
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virSecurityDriverPtr virSecurityDriverLookup(const char *name,
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virSecurityDriverPtr virSecurityDriverLookup(const char *name,
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@ -1204,3 +1204,39 @@ virSecurityManagerRestoreChardevLabel(virSecurityManagerPtr mgr,
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virReportUnsupportedError();
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virReportUnsupportedError();
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return -1;
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return -1;
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}
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}
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int
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virSecurityManagerSetTPMLabels(virSecurityManagerPtr mgr,
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virDomainDefPtr vm)
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{
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int ret;
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if (mgr->drv->domainSetSecurityTPMLabels) {
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virObjectLock(mgr);
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ret = mgr->drv->domainSetSecurityTPMLabels(mgr, vm);
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virObjectUnlock(mgr);
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return ret;
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}
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return 0;
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}
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int
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virSecurityManagerRestoreTPMLabels(virSecurityManagerPtr mgr,
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virDomainDefPtr vm)
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{
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int ret;
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if (mgr->drv->domainRestoreSecurityTPMLabels) {
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virObjectLock(mgr);
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ret = mgr->drv->domainRestoreSecurityTPMLabels(mgr, vm);
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virObjectUnlock(mgr);
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return ret;
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}
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return 0;
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}
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@ -194,4 +194,10 @@ int virSecurityManagerRestoreChardevLabel(virSecurityManagerPtr mgr,
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virDomainChrSourceDefPtr dev_source,
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virDomainChrSourceDefPtr dev_source,
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bool chardevStdioLogd);
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bool chardevStdioLogd);
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int virSecurityManagerSetTPMLabels(virSecurityManagerPtr mgr,
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virDomainDefPtr vm);
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int virSecurityManagerRestoreTPMLabels(virSecurityManagerPtr mgr,
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virDomainDefPtr vm);
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#endif /* VIR_SECURITY_MANAGER_H__ */
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#endif /* VIR_SECURITY_MANAGER_H__ */
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@ -3048,6 +3048,167 @@ virSecuritySELinuxDomainSetPathLabel(virSecurityManagerPtr mgr,
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return virSecuritySELinuxSetFilecon(mgr, path, seclabel->imagelabel);
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return virSecuritySELinuxSetFilecon(mgr, path, seclabel->imagelabel);
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}
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}
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/*
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* virSecuritySELinuxSetFileLabels:
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*
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* @mgr: the virSecurityManager
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* @path: path to a directory or a file
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* @seclabel: the security label
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*
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* Set the file labels on the given path; if the path is a directory
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* we label all files found there, including the directory itself,
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* otherwise we just label the file.
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*/
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static int
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virSecuritySELinuxSetFileLabels(virSecurityManagerPtr mgr,
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const char *path,
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virSecurityLabelDefPtr seclabel)
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{
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int ret = 0;
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struct dirent *ent;
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char *filename = NULL;
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DIR *dir;
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if ((ret = virSecuritySELinuxSetFilecon(mgr, path, seclabel->imagelabel)))
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return ret;
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if (!virFileIsDir(path))
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return 0;
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if (virDirOpen(&dir, path) < 0)
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return -1;
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while ((ret = virDirRead(dir, &ent, path)) > 0) {
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if (ent->d_type != DT_REG)
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continue;
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if (virAsprintf(&filename, "%s/%s", path, ent->d_name) < 0) {
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ret = -1;
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break;
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}
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ret = virSecuritySELinuxSetFilecon(mgr, filename,
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seclabel->imagelabel);
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VIR_FREE(filename);
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if (ret < 0)
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break;
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}
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if (ret < 0)
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virReportSystemError(errno, _("Unable to label files under %s"),
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path);
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virDirClose(&dir);
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return ret;
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}
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/*
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* virSecuritySELinuxRestoreFileLabels:
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*
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* @mgr: the virSecurityManager
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* @path: path to a directory or a file
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*
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* Restore the file labels on the given path; if the path is a directory
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* we restore all file labels found there, including the label of the
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* directory itself, otherwise we just restore the label on the file.
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*/
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static int
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virSecuritySELinuxRestoreFileLabels(virSecurityManagerPtr mgr,
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const char *path)
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{
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int ret = 0;
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struct dirent *ent;
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char *filename = NULL;
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DIR *dir;
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if ((ret = virSecuritySELinuxRestoreFileLabel(mgr, path)))
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return ret;
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if (!virFileIsDir(path))
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return 0;
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if (virDirOpen(&dir, path) < 0)
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return -1;
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while ((ret = virDirRead(dir, &ent, path)) > 0) {
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if (ent->d_type != DT_REG)
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continue;
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if (virAsprintf(&filename, "%s/%s", path, ent->d_name) < 0) {
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ret = -1;
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break;
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}
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ret = virSecuritySELinuxRestoreFileLabel(mgr, filename);
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VIR_FREE(filename);
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if (ret < 0)
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break;
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}
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if (ret < 0)
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virReportSystemError(errno, _("Unable to restore file labels under %s"),
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path);
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virDirClose(&dir);
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return ret;
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}
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static int
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virSecuritySELinuxSetTPMLabels(virSecurityManagerPtr mgr,
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virDomainDefPtr def)
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{
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int ret = 0;
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virSecurityLabelDefPtr seclabel;
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|
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seclabel = virDomainDefGetSecurityLabelDef(def, SECURITY_SELINUX_NAME);
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if (seclabel == NULL)
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return 0;
|
||||||
|
|
||||||
|
switch (def->tpm->type) {
|
||||||
|
case VIR_DOMAIN_TPM_TYPE_PASSTHROUGH:
|
||||||
|
break;
|
||||||
|
case VIR_DOMAIN_TPM_TYPE_EMULATOR:
|
||||||
|
ret = virSecuritySELinuxSetFileLabels(
|
||||||
|
mgr, def->tpm->data.emulator.storagepath,
|
||||||
|
seclabel);
|
||||||
|
if (ret == 0 && def->tpm->data.emulator.logfile)
|
||||||
|
ret = virSecuritySELinuxSetFileLabels(
|
||||||
|
mgr, def->tpm->data.emulator.logfile,
|
||||||
|
seclabel);
|
||||||
|
break;
|
||||||
|
case VIR_DOMAIN_TPM_TYPE_LAST:
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
|
||||||
|
return ret;
|
||||||
|
}
|
||||||
|
|
||||||
|
|
||||||
|
static int
|
||||||
|
virSecuritySELinuxRestoreTPMLabels(virSecurityManagerPtr mgr,
|
||||||
|
virDomainDefPtr def)
|
||||||
|
{
|
||||||
|
int ret = 0;
|
||||||
|
|
||||||
|
switch (def->tpm->type) {
|
||||||
|
case VIR_DOMAIN_TPM_TYPE_PASSTHROUGH:
|
||||||
|
break;
|
||||||
|
case VIR_DOMAIN_TPM_TYPE_EMULATOR:
|
||||||
|
ret = virSecuritySELinuxRestoreFileLabels(
|
||||||
|
mgr, def->tpm->data.emulator.storagepath);
|
||||||
|
if (ret == 0 && def->tpm->data.emulator.logfile)
|
||||||
|
ret = virSecuritySELinuxRestoreFileLabels(
|
||||||
|
mgr, def->tpm->data.emulator.logfile);
|
||||||
|
break;
|
||||||
|
case VIR_DOMAIN_TPM_TYPE_LAST:
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
|
||||||
|
return ret;
|
||||||
|
}
|
||||||
|
|
||||||
|
|
||||||
virSecurityDriver virSecurityDriverSELinux = {
|
virSecurityDriver virSecurityDriverSELinux = {
|
||||||
.privateDataLen = sizeof(virSecuritySELinuxData),
|
.privateDataLen = sizeof(virSecuritySELinuxData),
|
||||||
.name = SECURITY_SELINUX_NAME,
|
.name = SECURITY_SELINUX_NAME,
|
||||||
@ -3107,4 +3268,7 @@ virSecurityDriver virSecurityDriverSELinux = {
|
|||||||
|
|
||||||
.domainSetSecurityChardevLabel = virSecuritySELinuxSetChardevLabel,
|
.domainSetSecurityChardevLabel = virSecuritySELinuxSetChardevLabel,
|
||||||
.domainRestoreSecurityChardevLabel = virSecuritySELinuxRestoreChardevLabel,
|
.domainRestoreSecurityChardevLabel = virSecuritySELinuxRestoreChardevLabel,
|
||||||
|
|
||||||
|
.domainSetSecurityTPMLabels = virSecuritySELinuxSetTPMLabels,
|
||||||
|
.domainRestoreSecurityTPMLabels = virSecuritySELinuxRestoreTPMLabels,
|
||||||
};
|
};
|
||||||
|
@ -760,6 +760,43 @@ virSecurityStackDomainRestoreChardevLabel(virSecurityManagerPtr mgr,
|
|||||||
return rc;
|
return rc;
|
||||||
}
|
}
|
||||||
|
|
||||||
|
|
||||||
|
static int
|
||||||
|
virSecurityStackSetTPMLabels(virSecurityManagerPtr mgr,
|
||||||
|
virDomainDefPtr vm)
|
||||||
|
{
|
||||||
|
virSecurityStackDataPtr priv = virSecurityManagerGetPrivateData(mgr);
|
||||||
|
virSecurityStackItemPtr item = priv->itemsHead;
|
||||||
|
int rc = 0;
|
||||||
|
|
||||||
|
for (; item; item = item->next) {
|
||||||
|
if (virSecurityManagerSetTPMLabels(item->securityManager,
|
||||||
|
vm) < 0)
|
||||||
|
rc = -1;
|
||||||
|
}
|
||||||
|
|
||||||
|
return rc;
|
||||||
|
}
|
||||||
|
|
||||||
|
|
||||||
|
static int
|
||||||
|
virSecurityStackRestoreTPMLabels(virSecurityManagerPtr mgr,
|
||||||
|
virDomainDefPtr vm)
|
||||||
|
{
|
||||||
|
virSecurityStackDataPtr priv = virSecurityManagerGetPrivateData(mgr);
|
||||||
|
virSecurityStackItemPtr item = priv->itemsHead;
|
||||||
|
int rc = 0;
|
||||||
|
|
||||||
|
for (; item; item = item->next) {
|
||||||
|
if (virSecurityManagerRestoreTPMLabels(item->securityManager,
|
||||||
|
vm) < 0)
|
||||||
|
rc = -1;
|
||||||
|
}
|
||||||
|
|
||||||
|
return rc;
|
||||||
|
}
|
||||||
|
|
||||||
|
|
||||||
virSecurityDriver virSecurityDriverStack = {
|
virSecurityDriver virSecurityDriverStack = {
|
||||||
.privateDataLen = sizeof(virSecurityStackData),
|
.privateDataLen = sizeof(virSecurityStackData),
|
||||||
.name = "stack",
|
.name = "stack",
|
||||||
@ -822,4 +859,7 @@ virSecurityDriver virSecurityDriverStack = {
|
|||||||
|
|
||||||
.domainSetSecurityChardevLabel = virSecurityStackDomainSetChardevLabel,
|
.domainSetSecurityChardevLabel = virSecurityStackDomainSetChardevLabel,
|
||||||
.domainRestoreSecurityChardevLabel = virSecurityStackDomainRestoreChardevLabel,
|
.domainRestoreSecurityChardevLabel = virSecurityStackDomainRestoreChardevLabel,
|
||||||
|
|
||||||
|
.domainSetSecurityTPMLabels = virSecurityStackSetTPMLabels,
|
||||||
|
.domainRestoreSecurityTPMLabels = virSecurityStackRestoreTPMLabels,
|
||||||
};
|
};
|
||||||
|
Loading…
Reference in New Issue
Block a user