[libvirt] [PATCH 12/18] security_selinux: Remember old labels
Michal Privoznik
mprivozn at redhat.com
Fri Nov 23 08:43:30 UTC 2018
Signed-off-by: Michal Privoznik <mprivozn at redhat.com>
---
src/security/security_selinux.c | 161 ++++++++++++++++++++++----------
1 file changed, 114 insertions(+), 47 deletions(-)
diff --git a/src/security/security_selinux.c b/src/security/security_selinux.c
index 715d9a428b..4990d94b5f 100644
--- a/src/security/security_selinux.c
+++ b/src/security/security_selinux.c
@@ -33,6 +33,7 @@
#include "security_driver.h"
#include "security_selinux.h"
+#include "security_util.h"
#include "virerror.h"
#include "viralloc.h"
#include "virlog.h"
@@ -197,14 +198,40 @@ virSecuritySELinuxTransactionAppend(const char *path,
}
+static int
+virSecuritySELinuxRememberLabel(const char *path,
+ const security_context_t con)
+{
+ return virSecuritySetRememberedLabel(SECURITY_SELINUX_NAME,
+ path, con);
+}
+
+
+static int
+virSecuritySELinuxRecallLabel(const char *path,
+ security_context_t *con)
+{
+ if (virSecurityGetRememberedLabel(SECURITY_SELINUX_NAME,
+ path, con) < 0)
+ return -1;
+
+ if (!con)
+ return 1;
+
+ return 0;
+}
+
+
static int virSecuritySELinuxSetFileconHelper(const char *path,
const char *tcon,
bool optional,
- bool privileged);
+ bool privileged,
+ bool remember);
static int virSecuritySELinuxRestoreFileLabel(virSecurityManagerPtr mgr,
- const char *path);
+ const char *path,
+ bool recall);
/**
@@ -255,10 +282,12 @@ virSecuritySELinuxTransactionRun(pid_t pid ATTRIBUTE_UNUSED,
rv = virSecuritySELinuxSetFileconHelper(item->path,
item->tcon,
item->optional,
- privileged);
+ privileged,
+ list->lock);
} else {
rv = virSecuritySELinuxRestoreFileLabel(list->manager,
- item->path);
+ item->path,
+ list->lock);
}
if (rv < 0)
@@ -1275,16 +1304,38 @@ virSecuritySELinuxSetFileconImpl(const char *path, const char *tcon,
static int
virSecuritySELinuxSetFileconHelper(const char *path, const char *tcon,
- bool optional, bool privileged)
+ bool optional, bool privileged, bool remember)
{
+ security_context_t econ = NULL;
int rc;
+ int ret = -1;
if ((rc = virSecuritySELinuxTransactionAppend(path, tcon, optional, false)) < 0)
return -1;
else if (rc > 0)
return 0;
- return virSecuritySELinuxSetFileconImpl(path, tcon, optional, privileged);
+ if (remember) {
+ if (getfilecon_raw(path, &econ) < 0 &&
+ errno != ENOTSUP && errno != ENODATA) {
+ virReportSystemError(errno,
+ _("unable to get SELinux context of %s"),
+ path);
+ goto cleanup;
+ }
+
+ if (econ &&
+ virSecuritySELinuxRememberLabel(path, econ) < 0)
+ goto cleanup;
+ }
+
+ if (virSecuritySELinuxSetFileconImpl(path, tcon, optional, privileged) < 0)
+ goto cleanup;
+
+ ret = 0;
+ cleanup:
+ freecon(econ);
+ return ret;
}
@@ -1293,7 +1344,7 @@ virSecuritySELinuxSetFileconOptional(virSecurityManagerPtr mgr,
const char *path, const char *tcon)
{
bool privileged = virSecurityManagerGetPrivileged(mgr);
- return virSecuritySELinuxSetFileconHelper(path, tcon, true, privileged);
+ return virSecuritySELinuxSetFileconHelper(path, tcon, true, privileged, false);
}
static int
@@ -1301,7 +1352,7 @@ virSecuritySELinuxSetFilecon(virSecurityManagerPtr mgr,
const char *path, const char *tcon)
{
bool privileged = virSecurityManagerGetPrivileged(mgr);
- return virSecuritySELinuxSetFileconHelper(path, tcon, false, privileged);
+ return virSecuritySELinuxSetFileconHelper(path, tcon, false, privileged, false);
}
static int
@@ -1362,7 +1413,8 @@ getContext(virSecurityManagerPtr mgr ATTRIBUTE_UNUSED,
* errors that the caller(s) are already dealing with */
static int
virSecuritySELinuxRestoreFileLabel(virSecurityManagerPtr mgr,
- const char *path)
+ const char *path,
+ bool recall)
{
bool privileged = virSecurityManagerGetPrivileged(mgr);
struct stat buf;
@@ -1386,26 +1438,35 @@ virSecuritySELinuxRestoreFileLabel(virSecurityManagerPtr mgr,
goto cleanup;
}
- if (stat(newpath, &buf) != 0) {
- VIR_WARN("cannot stat %s: %s", newpath,
- virStrerror(errno, ebuf, sizeof(ebuf)));
- goto cleanup;
- }
-
- if (getContext(mgr, newpath, buf.st_mode, &fcon) < 0) {
- /* Any user created path likely does not have a default label,
- * which makes this an expected non error
- */
- VIR_WARN("cannot lookup default selinux label for %s", newpath);
- ret = 0;
- goto cleanup;
- }
-
- if ((rc = virSecuritySELinuxTransactionAppend(path, fcon, false, true)) < 0)
+ if ((rc = virSecuritySELinuxTransactionAppend(path, NULL, false, true)) < 0)
return -1;
else if (rc > 0)
return 0;
+ if (recall) {
+ if ((rc = virSecuritySELinuxRecallLabel(newpath, &fcon)) < 0) {
+ goto cleanup;
+ } else if (rc > 0) {
+ ret = 0;
+ goto cleanup;
+ }
+ } else {
+ if (stat(newpath, &buf) != 0) {
+ VIR_WARN("cannot stat %s: %s", newpath,
+ virStrerror(errno, ebuf, sizeof(ebuf)));
+ goto cleanup;
+ }
+
+ if (getContext(mgr, newpath, buf.st_mode, &fcon) < 0) {
+ /* Any user created path likely does not have a default label,
+ * which makes this an expected non error
+ */
+ VIR_WARN("cannot lookup default selinux label for %s", newpath);
+ ret = 0;
+ goto cleanup;
+ }
+ }
+
if (virSecuritySELinuxSetFileconImpl(newpath, fcon, false, privileged) < 0)
goto cleanup;
@@ -1460,7 +1521,7 @@ virSecuritySELinuxRestoreInputLabel(virSecurityManagerPtr mgr,
switch ((virDomainInputType)input->type) {
case VIR_DOMAIN_INPUT_TYPE_PASSTHROUGH:
- rc = virSecuritySELinuxRestoreFileLabel(mgr, input->source.evdev);
+ rc = virSecuritySELinuxRestoreFileLabel(mgr, input->source.evdev, false);
break;
case VIR_DOMAIN_INPUT_TYPE_MOUSE:
@@ -1516,7 +1577,7 @@ virSecuritySELinuxRestoreMemoryLabel(virSecurityManagerPtr mgr,
if (!seclabel || !seclabel->relabel)
return 0;
- ret = virSecuritySELinuxRestoreFileLabel(mgr, mem->nvdimmPath);
+ ret = virSecuritySELinuxRestoreFileLabel(mgr, mem->nvdimmPath, false);
break;
case VIR_DOMAIN_MEMORY_MODEL_DIMM:
@@ -1595,10 +1656,10 @@ virSecuritySELinuxRestoreTPMFileLabelInt(virSecurityManagerPtr mgr,
switch (tpm->type) {
case VIR_DOMAIN_TPM_TYPE_PASSTHROUGH:
tpmdev = tpm->data.passthrough.source.data.file.path;
- rc = virSecuritySELinuxRestoreFileLabel(mgr, tpmdev);
+ rc = virSecuritySELinuxRestoreFileLabel(mgr, tpmdev, false);
if ((cancel_path = virTPMCreateCancelPath(tpmdev)) != NULL) {
- if (virSecuritySELinuxRestoreFileLabel(mgr, cancel_path) < 0)
+ if (virSecuritySELinuxRestoreFileLabel(mgr, cancel_path, false) < 0)
rc = -1;
VIR_FREE(cancel_path);
}
@@ -1665,7 +1726,7 @@ virSecuritySELinuxRestoreImageLabelInt(virSecurityManagerPtr mgr,
}
}
- return virSecuritySELinuxRestoreFileLabel(mgr, src->path);
+ return virSecuritySELinuxRestoreFileLabel(mgr, src->path, false);
}
@@ -2053,7 +2114,7 @@ virSecuritySELinuxRestorePCILabel(virPCIDevicePtr dev ATTRIBUTE_UNUSED,
{
virSecurityManagerPtr mgr = opaque;
- return virSecuritySELinuxRestoreFileLabel(mgr, file);
+ return virSecuritySELinuxRestoreFileLabel(mgr, file, false);
}
static int
@@ -2063,7 +2124,7 @@ virSecuritySELinuxRestoreUSBLabel(virUSBDevicePtr dev ATTRIBUTE_UNUSED,
{
virSecurityManagerPtr mgr = opaque;
- return virSecuritySELinuxRestoreFileLabel(mgr, file);
+ return virSecuritySELinuxRestoreFileLabel(mgr, file, false);
}
@@ -2080,7 +2141,7 @@ virSecuritySELinuxRestoreSCSILabel(virSCSIDevicePtr dev,
if (virSCSIDeviceGetShareable(dev) || virSCSIDeviceGetReadonly(dev))
return 0;
- return virSecuritySELinuxRestoreFileLabel(mgr, file);
+ return virSecuritySELinuxRestoreFileLabel(mgr, file, false);
}
static int
@@ -2090,7 +2151,7 @@ virSecuritySELinuxRestoreHostLabel(virSCSIVHostDevicePtr dev ATTRIBUTE_UNUSED,
{
virSecurityManagerPtr mgr = opaque;
- return virSecuritySELinuxRestoreFileLabel(mgr, file);
+ return virSecuritySELinuxRestoreFileLabel(mgr, file, false);
}
@@ -2194,7 +2255,7 @@ virSecuritySELinuxRestoreHostdevSubsysLabel(virSecurityManagerPtr mgr,
if (!(vfiodev = virMediatedDeviceGetIOMMUGroupDev(mdevsrc->uuidstr)))
goto done;
- ret = virSecuritySELinuxRestoreFileLabel(mgr, vfiodev);
+ ret = virSecuritySELinuxRestoreFileLabel(mgr, vfiodev, false);
VIR_FREE(vfiodev);
break;
@@ -2228,7 +2289,7 @@ virSecuritySELinuxRestoreHostdevCapsLabel(virSecurityManagerPtr mgr,
if (VIR_STRDUP(path, dev->source.caps.u.storage.block) < 0)
return -1;
}
- ret = virSecuritySELinuxRestoreFileLabel(mgr, path);
+ ret = virSecuritySELinuxRestoreFileLabel(mgr, path, false);
VIR_FREE(path);
break;
}
@@ -2242,7 +2303,7 @@ virSecuritySELinuxRestoreHostdevCapsLabel(virSecurityManagerPtr mgr,
if (VIR_STRDUP(path, dev->source.caps.u.misc.chardev) < 0)
return -1;
}
- ret = virSecuritySELinuxRestoreFileLabel(mgr, path);
+ ret = virSecuritySELinuxRestoreFileLabel(mgr, path, false);
VIR_FREE(path);
break;
}
@@ -2390,14 +2451,18 @@ virSecuritySELinuxRestoreChardevLabel(virSecurityManagerPtr mgr,
switch (dev_source->type) {
case VIR_DOMAIN_CHR_TYPE_DEV:
case VIR_DOMAIN_CHR_TYPE_FILE:
- if (virSecuritySELinuxRestoreFileLabel(mgr, dev_source->data.file.path) < 0)
+ if (virSecuritySELinuxRestoreFileLabel(mgr,
+ dev_source->data.file.path,
+ false) < 0)
goto done;
ret = 0;
break;
case VIR_DOMAIN_CHR_TYPE_UNIX:
if (!dev_source->data.nix.listen) {
- if (virSecuritySELinuxRestoreFileLabel(mgr, dev_source->data.file.path) < 0)
+ if (virSecuritySELinuxRestoreFileLabel(mgr,
+ dev_source->data.file.path,
+ false) < 0)
goto done;
}
ret = 0;
@@ -2408,11 +2473,13 @@ virSecuritySELinuxRestoreChardevLabel(virSecurityManagerPtr mgr,
(virAsprintf(&in, "%s.in", dev_source->data.file.path) < 0))
goto done;
if (virFileExists(in) && virFileExists(out)) {
- if ((virSecuritySELinuxRestoreFileLabel(mgr, out) < 0) ||
- (virSecuritySELinuxRestoreFileLabel(mgr, in) < 0)) {
+ if ((virSecuritySELinuxRestoreFileLabel(mgr, out, false) < 0) ||
+ (virSecuritySELinuxRestoreFileLabel(mgr, in, false) < 0)) {
goto done;
}
- } else if (virSecuritySELinuxRestoreFileLabel(mgr, dev_source->data.file.path) < 0) {
+ } else if (virSecuritySELinuxRestoreFileLabel(mgr,
+ dev_source->data.file.path,
+ false) < 0) {
goto done;
}
ret = 0;
@@ -2464,7 +2531,7 @@ virSecuritySELinuxRestoreSecuritySmartcardCallback(virDomainDefPtr def,
database = dev->data.cert.database;
if (!database)
database = VIR_DOMAIN_SMARTCARD_DEFAULT_DATABASE;
- return virSecuritySELinuxRestoreFileLabel(mgr, database);
+ return virSecuritySELinuxRestoreFileLabel(mgr, database, false);
case VIR_DOMAIN_SMARTCARD_TYPE_PASSTHROUGH:
return virSecuritySELinuxRestoreChardevLabel(mgr, def,
@@ -2559,7 +2626,7 @@ virSecuritySELinuxRestoreAllLabel(virSecurityManagerPtr mgr,
rc = -1;
if (def->os.loader && def->os.loader->nvram &&
- virSecuritySELinuxRestoreFileLabel(mgr, def->os.loader->nvram) < 0)
+ virSecuritySELinuxRestoreFileLabel(mgr, def->os.loader->nvram, false) < 0)
rc = -1;
return rc;
@@ -2619,7 +2686,7 @@ virSecuritySELinuxRestoreSavedStateLabel(virSecurityManagerPtr mgr,
if (!secdef || !secdef->relabel)
return 0;
- return virSecuritySELinuxRestoreFileLabel(mgr, savefile);
+ return virSecuritySELinuxRestoreFileLabel(mgr, savefile, false);
}
@@ -3214,7 +3281,7 @@ virSecuritySELinuxRestoreFileLabels(virSecurityManagerPtr mgr,
char *filename = NULL;
DIR *dir;
- if ((ret = virSecuritySELinuxRestoreFileLabel(mgr, path)))
+ if ((ret = virSecuritySELinuxRestoreFileLabel(mgr, path, false)))
return ret;
if (!virFileIsDir(path))
@@ -3231,7 +3298,7 @@ virSecuritySELinuxRestoreFileLabels(virSecurityManagerPtr mgr,
ret = -1;
break;
}
- ret = virSecuritySELinuxRestoreFileLabel(mgr, filename);
+ ret = virSecuritySELinuxRestoreFileLabel(mgr, filename, false);
VIR_FREE(filename);
if (ret < 0)
break;
--
2.18.1
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