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a379b86cd2
libvirt/src/security/security_dac.c
Michal Privoznik a379b86cd2 security_dac: Implement virSecurityManagerMoveImageMetadata 
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Cole Robinson <crobinso@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
2019-07-03 08:36:04 +02:00

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/*
* Copyright (C) 2010-2014 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see
* <http://www.gnu.org/licenses/>.
*
* POSIX DAC security driver
*/
#include <config.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#ifdef __FreeBSD__
# include <sys/sysctl.h>
# include <sys/user.h>
#endif
#include "security_dac.h"
#include "security_util.h"
#include "virerror.h"
#include "virfile.h"
#include "viralloc.h"
#include "virlog.h"
#include "virmdev.h"
#include "virpci.h"
#include "virusb.h"
#include "virscsi.h"
#include "virscsivhost.h"
#include "virstoragefile.h"
#include "virstring.h"
#include "virutil.h"
#define VIR_FROM_THIS VIR_FROM_SECURITY
VIR_LOG_INIT("security.security_dac");
#define SECURITY_DAC_NAME "dac"
#define DEV_SEV "/dev/sev"
typedef struct _virSecurityDACData virSecurityDACData;
typedef virSecurityDACData *virSecurityDACDataPtr;
struct _virSecurityDACData {
uid_t user;
gid_t group;
gid_t *groups;
int ngroups;
bool dynamicOwnership;
bool mountNamespace;
char *baselabel;
virSecurityManagerDACChownCallback chownCallback;
};
typedef struct _virSecurityDACCallbackData virSecurityDACCallbackData;
typedef virSecurityDACCallbackData *virSecurityDACCallbackDataPtr;
struct _virSecurityDACCallbackData {
virSecurityManagerPtr manager;
virSecurityLabelDefPtr secdef;
};
typedef struct _virSecurityDACChownItem virSecurityDACChownItem;
typedef virSecurityDACChownItem *virSecurityDACChownItemPtr;
struct _virSecurityDACChownItem {
char *path;
const virStorageSource *src;
uid_t uid;
gid_t gid;
bool remember; /* Whether owner remembering should be done for @path/@src */
bool restore; /* Whether current operation is 'set' or 'restore' */
};
typedef struct _virSecurityDACChownList virSecurityDACChownList;
typedef virSecurityDACChownList *virSecurityDACChownListPtr;
struct _virSecurityDACChownList {
virSecurityManagerPtr manager;
virSecurityDACChownItemPtr *items;
size_t nItems;
bool lock;
};
virThreadLocal chownList;
static int
virSecurityDACChownListAppend(virSecurityDACChownListPtr list,
const char *path,
const virStorageSource *src,
uid_t uid,
gid_t gid,
bool remember,
bool restore)
{
int ret = -1;
char *tmp = NULL;
virSecurityDACChownItemPtr item = NULL;
if (VIR_ALLOC(item) < 0)
return -1;
if (VIR_STRDUP(tmp, path) < 0)
goto cleanup;
item->path = tmp;
item->src = src;
item->uid = uid;
item->gid = gid;
item->remember = remember;
item->restore = restore;
if (VIR_APPEND_ELEMENT(list->items, list->nItems, item) < 0)
goto cleanup;
tmp = NULL;
ret = 0;
cleanup:
VIR_FREE(tmp);
VIR_FREE(item);
return ret;
}
static void
virSecurityDACChownListFree(void *opaque)
{
virSecurityDACChownListPtr list = opaque;
size_t i;
if (!list)
return;
for (i = 0; i < list->nItems; i++) {
VIR_FREE(list->items[i]->path);
VIR_FREE(list->items[i]);
}
VIR_FREE(list->items);
virObjectUnref(list->manager);
VIR_FREE(list);
}
/**
* virSecurityDACTransactionAppend:
* @path: Path to chown
* @src: disk source to chown
* @uid: user ID
* @gid: group ID
* @remember: if the original owner should be recorded/recalled
* @restore: if current operation is set or restore
*
* Appends an entry onto transaction list.
* The @remember should be true if caller wishes to record/recall
* the original owner of @path/@src.
* The @restore should be true if the operation is restoring
* seclabel and false otherwise.
*
* Returns: 1 in case of successful append
* 0 if there is no transaction enabled
* -1 otherwise.
*/
static int
virSecurityDACTransactionAppend(const char *path,
const virStorageSource *src,
uid_t uid,
gid_t gid,
bool remember,
bool restore)
{
virSecurityDACChownListPtr list = virThreadLocalGet(&chownList);
if (!list)
return 0;
if (virSecurityDACChownListAppend(list, path, src,
uid, gid, remember, restore) < 0)
return -1;
return 1;
}
static int virSecurityDACSetOwnership(virSecurityManagerPtr mgr,
const virStorageSource *src,
const char *path,
uid_t uid,
gid_t gid,
bool remember);
static int virSecurityDACRestoreFileLabelInternal(virSecurityManagerPtr mgr,
const virStorageSource *src,
const char *path,
bool recall);
/**
* virSecurityDACTransactionRun:
* @pid: process pid
* @opaque: opaque data
*
* This is the callback that runs in the same namespace as the domain we are
* relabelling. For given transaction (@opaque) it relabels all the paths on
* the list. Depending on security manager configuration it might lock paths
* we will relabel.
*
* Returns: 0 on success
* -1 otherwise.
*/
static int
virSecurityDACTransactionRun(pid_t pid ATTRIBUTE_UNUSED,
void *opaque)
{
virSecurityDACChownListPtr list = opaque;
virSecurityManagerMetadataLockStatePtr state;
const char **paths = NULL;
size_t npaths = 0;
size_t i;
int rv = 0;
int ret = -1;
if (list->lock) {
if (VIR_ALLOC_N(paths, list->nItems) < 0)
return -1;
for (i = 0; i < list->nItems; i++) {
const char *p = list->items[i]->path;
VIR_APPEND_ELEMENT_COPY_INPLACE(paths, npaths, p);
}
if (!(state = virSecurityManagerMetadataLock(list->manager, paths, npaths)))
goto cleanup;
}
for (i = 0; i < list->nItems; i++) {
virSecurityDACChownItemPtr item = list->items[i];
const bool remember = item->remember && list->lock;
if (!item->restore) {
rv = virSecurityDACSetOwnership(list->manager,
item->src,
item->path,
item->uid,
item->gid,
remember);
} else {
rv = virSecurityDACRestoreFileLabelInternal(list->manager,
item->src,
item->path,
remember);
}
if (rv < 0)
break;
}
for (; rv < 0 && i > 0; i--) {
virSecurityDACChownItemPtr item = list->items[i - 1];
const bool remember = item->remember && list->lock;
if (!item->restore) {
virSecurityDACRestoreFileLabelInternal(list->manager,
item->src,
item->path,
remember);
} else {
VIR_WARN("Ignoring failed restore attempt on %s",
NULLSTR(item->src ? item->src->path : item->path));
}
}
if (list->lock)
virSecurityManagerMetadataUnlock(list->manager, &state);
if (rv < 0)
goto cleanup;
ret = 0;
cleanup:
VIR_FREE(paths);
return ret;
}
/* returns -1 on error, 0 on success */
int
virSecurityDACSetUserAndGroup(virSecurityManagerPtr mgr,
uid_t user,
gid_t group)
{
virSecurityDACDataPtr priv = virSecurityManagerGetPrivateData(mgr);
priv->user = user;
priv->group = group;
if (virAsprintf(&priv->baselabel, "+%u:+%u",
(unsigned int)user,
(unsigned int)group) < 0)
return -1;
return 0;
}
void
virSecurityDACSetDynamicOwnership(virSecurityManagerPtr mgr,
bool dynamicOwnership)
{
virSecurityDACDataPtr priv = virSecurityManagerGetPrivateData(mgr);
priv->dynamicOwnership = dynamicOwnership;
}
void
virSecurityDACSetMountNamespace(virSecurityManagerPtr mgr,
bool mountNamespace)
{
virSecurityDACDataPtr priv = virSecurityManagerGetPrivateData(mgr);
priv->mountNamespace = mountNamespace;
}
void
virSecurityDACSetChownCallback(virSecurityManagerPtr mgr,
virSecurityManagerDACChownCallback chownCallback)
{
virSecurityDACDataPtr priv = virSecurityManagerGetPrivateData(mgr);
priv->chownCallback = chownCallback;
}
/* returns 1 if label isn't found, 0 on success, -1 on error */
static int
ATTRIBUTE_NONNULL(2) ATTRIBUTE_NONNULL(3)
virSecurityDACParseIds(virSecurityLabelDefPtr seclabel,
uid_t *uidPtr, gid_t *gidPtr)
{
if (!seclabel || !seclabel->label)
return 1;
if (virParseOwnershipIds(seclabel->label, uidPtr, gidPtr) < 0)
return -1;
return 0;
}
static int
ATTRIBUTE_NONNULL(3) ATTRIBUTE_NONNULL(4)
virSecurityDACGetIds(virSecurityLabelDefPtr seclabel,
virSecurityDACDataPtr priv,
uid_t *uidPtr, gid_t *gidPtr,
gid_t **groups, int *ngroups)
{
int ret;
if (groups)
*groups = priv ? priv->groups : NULL;
if (ngroups)
*ngroups = priv ? priv->ngroups : 0;
if ((ret = virSecurityDACParseIds(seclabel, uidPtr, gidPtr)) <= 0)
return ret;
if (!priv) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("DAC seclabel couldn't be determined"));
return -1;
}
*uidPtr = priv->user;
*gidPtr = priv->group;
return 0;
}
/* returns 1 if label isn't found, 0 on success, -1 on error */
static int
ATTRIBUTE_NONNULL(2) ATTRIBUTE_NONNULL(3)
virSecurityDACParseImageIds(virSecurityLabelDefPtr seclabel,
uid_t *uidPtr, gid_t *gidPtr)
{
if (!seclabel || !seclabel->imagelabel)
return 1;
if (virParseOwnershipIds(seclabel->imagelabel, uidPtr, gidPtr) < 0)
return -1;
return 0;
}
static int
ATTRIBUTE_NONNULL(3) ATTRIBUTE_NONNULL(4)
virSecurityDACGetImageIds(virSecurityLabelDefPtr seclabel,
virSecurityDACDataPtr priv,
uid_t *uidPtr, gid_t *gidPtr)
{
int ret;
if ((ret = virSecurityDACParseImageIds(seclabel, uidPtr, gidPtr)) <= 0)
return ret;
if (!priv) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("DAC imagelabel couldn't be determined"));
return -1;
}
*uidPtr = priv->user;
*gidPtr = priv->group;
return 0;
}
/**
* virSecurityDACRememberLabel:
* @priv: driver's private data
* @path: path to the file
* @uid: user owning the @path
* @gid: group owning the @path
*
* Remember the owner of @path (represented by @uid:@gid).
*
* Returns: the @path refcount, or
* -1 on failure
*/
static int
virSecurityDACRememberLabel(virSecurityDACDataPtr priv ATTRIBUTE_UNUSED,
const char *path,
uid_t uid,
gid_t gid)
{
char *label = NULL;
int ret = -1;
if (virAsprintf(&label, "+%u:+%u",
(unsigned int)uid,
(unsigned int)gid) < 0)
return -1;
ret = virSecuritySetRememberedLabel(SECURITY_DAC_NAME, path, label);
VIR_FREE(label);
return ret;
}
/**
* virSecurityDACRecallLabel:
* @priv: driver's private data
* @path: path to the file
* @uid: user owning the @path
* @gid: group owning the @path
*
* Recall the previously recorded owner for the @path. However, it may happen
* that @path is still in use (e.g. by another domain). In that case, 1 is
* returned and caller should not relabel the @path.
*
* Returns: 1 if @path is still in use (@uid and @gid not touched)
* 0 if @path should be restored (@uid and @gid set)
* -1 on failure (@uid and @gid not touched)
*/
static int
virSecurityDACRecallLabel(virSecurityDACDataPtr priv ATTRIBUTE_UNUSED,
const char *path,
uid_t *uid,
gid_t *gid)
{
char *label;
int ret = -1;
int rv;
rv = virSecurityGetRememberedLabel(SECURITY_DAC_NAME, path, &label);
if (rv < 0)
return rv;
if (!label)
return 1;
if (virParseOwnershipIds(label, uid, gid) < 0)
goto cleanup;
ret = 0;
cleanup:
VIR_FREE(label);
return ret;
}
static virSecurityDriverStatus
virSecurityDACProbe(const char *virtDriver ATTRIBUTE_UNUSED)
{
return SECURITY_DRIVER_ENABLE;
}
static int
virSecurityDACOpen(virSecurityManagerPtr mgr ATTRIBUTE_UNUSED)
{
if (virThreadLocalInit(&chownList,
virSecurityDACChownListFree) < 0) {
virReportSystemError(errno, "%s",
_("Unable to initialize thread local variable"));
return -1;
}
return 0;
}
static int
virSecurityDACClose(virSecurityManagerPtr mgr)
{
virSecurityDACDataPtr priv = virSecurityManagerGetPrivateData(mgr);
VIR_FREE(priv->groups);
VIR_FREE(priv->baselabel);
return 0;
}
static const char *
virSecurityDACGetModel(virSecurityManagerPtr mgr ATTRIBUTE_UNUSED)
{
return SECURITY_DAC_NAME;
}
static const char *
virSecurityDACGetDOI(virSecurityManagerPtr mgr ATTRIBUTE_UNUSED)
{
return "0";
}
static int
virSecurityDACPreFork(virSecurityManagerPtr mgr)
{
virSecurityDACDataPtr priv = virSecurityManagerGetPrivateData(mgr);
int ngroups;
VIR_FREE(priv->groups);
priv->ngroups = 0;
if ((ngroups = virGetGroupList(priv->user, priv->group,
&priv->groups)) < 0)
return -1;
priv->ngroups = ngroups;
return 0;
}
/**
* virSecurityDACTransactionStart:
* @mgr: security manager
*
* Starts a new transaction. In transaction nothing is chown()-ed until
* TransactionCommit() is called. This is implemented as a list that is
* appended to whenever chown() would be called. Since secdriver APIs
* can be called from multiple threads (to work over different domains)
* the pointer to the list is stored in thread local variable.
*
* Returns 0 on success,
* -1 otherwise.
*/
static int
virSecurityDACTransactionStart(virSecurityManagerPtr mgr)
{
virSecurityDACChownListPtr list;
list = virThreadLocalGet(&chownList);
if (list) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("Another relabel transaction is already started"));
return -1;
}
if (VIR_ALLOC(list) < 0)
return -1;
list->manager = virObjectRef(mgr);
if (virThreadLocalSet(&chownList, list) < 0) {
virReportSystemError(errno, "%s",
_("Unable to set thread local variable"));
virSecurityDACChownListFree(list);
return -1;
}
return 0;
}
/**
* virSecurityDACTransactionCommit:
* @mgr: security manager
* @pid: domain's PID
* @lock: lock and unlock paths that are relabeled
*
* If @pid is not -1 then enter the @pid namespace (usually @pid refers
* to a domain) and perform all the chown()-s on the list. If @pid is -1
* then the transaction is performed in the namespace of the caller.
*
* If @lock is true then all the paths that transaction would
* touch are locked before and unlocked after it is done so.
*
* Note that the transaction is also freed, therefore new one has to be
* started after successful return from this function. Also it is
* considered as error if there's no transaction set and this function
* is called.
*
* Returns: 0 on success,
* -1 otherwise.
*/
static int
virSecurityDACTransactionCommit(virSecurityManagerPtr mgr ATTRIBUTE_UNUSED,
pid_t pid,
bool lock)
{
virSecurityDACChownListPtr list;
int rc;
int ret = -1;
list = virThreadLocalGet(&chownList);
if (!list) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("No transaction is set"));
goto cleanup;
}
if (virThreadLocalSet(&chownList, NULL) < 0) {
virReportSystemError(errno, "%s",
_("Unable to clear thread local variable"));
goto cleanup;
}
list->lock = lock;
if (pid == -1) {
if (lock)
rc = virProcessRunInFork(virSecurityDACTransactionRun, list);
else
rc = virSecurityDACTransactionRun(pid, list);
} else {
rc = virProcessRunInMountNamespace(pid,
virSecurityDACTransactionRun,
list);
}
if (rc < 0)
goto cleanup;
ret = 0;
cleanup:
virSecurityDACChownListFree(list);
return ret;
}
/**
* virSecurityDACTransactionAbort:
* @mgr: security manager
*
* Cancels and frees any out standing transaction.
*/
static void
virSecurityDACTransactionAbort(virSecurityManagerPtr mgr ATTRIBUTE_UNUSED)
{
virSecurityDACChownListPtr list;
list = virThreadLocalGet(&chownList);
if (!list)
return;
if (virThreadLocalSet(&chownList, NULL) < 0)
VIR_DEBUG("Unable to clear thread local variable");
virSecurityDACChownListFree(list);
}
static int
virSecurityDACSetOwnershipInternal(const virSecurityDACData *priv,
const virStorageSource *src,
const char *path,
uid_t uid,
gid_t gid)
{
int rc;
/* Be aware that this function might run in a separate process.
* Therefore, any driver state changes would be thrown away. */
if (priv && src && priv->chownCallback) {
rc = priv->chownCallback(src, uid, gid);
/* here path is used only for error messages */
path = NULLSTR(src->path);
/* on -2 returned an error was already reported */
if (rc == -2)
return -1;
} else {
struct stat sb;
if (!path) {
if (!src || !src->path)
return 0;
if (!virStorageSourceIsLocalStorage(src))
return 0;
path = src->path;
}
if (stat(path, &sb) < 0) {
virReportSystemError(errno, _("unable to stat: %s"), path);
return -1;
}
if (sb.st_uid == uid && sb.st_gid == gid) {
/* nothing to chown */
return 0;
}
rc = chown(path, uid, gid);
}
if (rc < 0) {
if (errno == EOPNOTSUPP || errno == EINVAL) {
VIR_INFO("Setting user and group to '%ld:%ld' on '%s' not "
"supported by filesystem",
(long)uid, (long)gid, path);
} else if (errno == EPERM) {
VIR_INFO("Setting user and group to '%ld:%ld' on '%s' not "
"permitted",
(long)uid, (long)gid, path);
} else if (errno == EROFS) {
VIR_INFO("Setting user and group to '%ld:%ld' on '%s' not "
"possible on readonly filesystem",
(long)uid, (long)gid, path);
} else {
virReportSystemError(errno,
_("unable to set user and group to '%ld:%ld' "
"on '%s'"),
(long)uid, (long)gid, path);
return -1;
}
}
return 0;
}
static int
virSecurityDACSetOwnership(virSecurityManagerPtr mgr,
const virStorageSource *src,
const char *path,
uid_t uid,
gid_t gid,
bool remember)
{
virSecurityDACDataPtr priv = virSecurityManagerGetPrivateData(mgr);
struct stat sb;
int refcount;
int rc;
if (!path && src && src->path &&
virStorageSourceIsLocalStorage(src))
path = src->path;
/* Be aware that this function might run in a separate process.
* Therefore, any driver state changes would be thrown away. */
if ((rc = virSecurityDACTransactionAppend(path, src,
uid, gid, remember, false)) < 0)
return -1;
else if (rc > 0)
return 0;
if (remember && path) {
if (stat(path, &sb) < 0) {
virReportSystemError(errno, _("unable to stat: %s"), path);
return -1;
}
refcount = virSecurityDACRememberLabel(priv, path, sb.st_uid, sb.st_gid);
if (refcount == -2) {
/* Not supported. Don't error though. */
} else if (refcount < 0) {
return -1;
} else if (refcount > 1) {
/* Refcount is greater than 1 which means that there
* is @refcount domains using the @path. Do not
* change the label (as it would almost certainly
* cause the other domains to lose access to the
* @path). */
if (sb.st_uid != uid || sb.st_gid != gid) {
virReportError(VIR_ERR_OPERATION_INVALID,
_("Setting different DAC user or group on %s "
"which is already in use"), path);
return -1;
}
}
}
VIR_INFO("Setting DAC user and group on '%s' to '%ld:%ld'",
NULLSTR(src ? src->path : path), (long)uid, (long)gid);
if (virSecurityDACSetOwnershipInternal(priv, src, path, uid, gid) < 0) {
virErrorPtr origerr;
virErrorPreserveLast(&origerr);
/* Try to restore the label. This is done so that XATTRs
* are left in the same state as when the control entered
* this function. However, if our attempt fails, there's
* not much we can do. XATTRs refcounting is fubar'ed and
* the only option we have is warn users. */
if (virSecurityDACRestoreFileLabelInternal(mgr, src, path, remember) < 0)
VIR_WARN("Unable to restore label on '%s'. "
"XATTRs might have been left in inconsistent state.",
NULLSTR(src ? src->path : path));
virErrorRestore(&origerr);
return -1;
}
return 0;
}
static int
virSecurityDACRestoreFileLabelInternal(virSecurityManagerPtr mgr,
const virStorageSource *src,
const char *path,
bool recall)
{
virSecurityDACDataPtr priv = virSecurityManagerGetPrivateData(mgr);
int rv;
uid_t uid = 0; /* By default return to root:root */
gid_t gid = 0;
if (!path && src && src->path &&
virStorageSourceIsLocalStorage(src))
path = src->path;
/* Be aware that this function might run in a separate process.
* Therefore, any driver state changes would be thrown away. */
if ((rv = virSecurityDACTransactionAppend(path, src, uid, gid, recall, true)) < 0)
return -1;
else if (rv > 0)
return 0;
if (recall && path) {
rv = virSecurityDACRecallLabel(priv, path, &uid, &gid);
if (rv == -2) {
/* Not supported. Don't error though. */
} else if (rv < 0) {
return -1;
} else if (rv > 0) {
return 0;
}
}
VIR_INFO("Restoring DAC user and group on '%s' to %ld:%ld",
NULLSTR(src ? src->path : path), (long)uid, (long)gid);
return virSecurityDACSetOwnershipInternal(priv, src, path, uid, gid);
}
static int
virSecurityDACRestoreFileLabel(virSecurityManagerPtr mgr,
const char *path)
{
return virSecurityDACRestoreFileLabelInternal(mgr, NULL, path, true);
}
static int
virSecurityDACSetImageLabelInternal(virSecurityManagerPtr mgr,
virDomainDefPtr def,
virStorageSourcePtr src,
virStorageSourcePtr parent)
{
virSecurityLabelDefPtr secdef;
virSecurityDeviceLabelDefPtr disk_seclabel;
virSecurityDeviceLabelDefPtr parent_seclabel = NULL;
virSecurityDACDataPtr priv = virSecurityManagerGetPrivateData(mgr);
bool remember;
uid_t user;
gid_t group;
if (!priv->dynamicOwnership)
return 0;
secdef = virDomainDefGetSecurityLabelDef(def, SECURITY_DAC_NAME);
if (secdef && !secdef->relabel)
return 0;
disk_seclabel = virStorageSourceGetSecurityLabelDef(src, SECURITY_DAC_NAME);
if (parent)
parent_seclabel = virStorageSourceGetSecurityLabelDef(parent,
SECURITY_DAC_NAME);
if (disk_seclabel && (!disk_seclabel->relabel || disk_seclabel->label)) {
if (!disk_seclabel->relabel)
return 0;
if (virParseOwnershipIds(disk_seclabel->label, &user, &group) < 0)
return -1;
} else if (parent_seclabel &&
(!parent_seclabel->relabel || parent_seclabel->label)) {
if (!parent_seclabel->relabel)
return 0;
if (virParseOwnershipIds(parent_seclabel->label, &user, &group) < 0)
return -1;
} else {
if (virSecurityDACGetImageIds(secdef, priv, &user, &group))
return -1;
}
/* We can't do restore on shared resources safely. Not even
* with refcounting implemented in XATTRs because if there
* was a domain running with the feature turned off the
* refcounter in XATTRs would not reflect the actual number
* of times the resource is in use and thus the last restore
* on the resource (which actually restores the original
* owner) might cut off access to the domain with the feature
* disabled.
* For disks, a shared resource is the whole backing chain
* but the top layer, or read only image, or disk explicitly
* marked as shared.
*/
remember = src == parent && !src->readonly && !src->shared;
return virSecurityDACSetOwnership(mgr, src, NULL, user, group, remember);
}
static int
virSecurityDACSetImageLabel(virSecurityManagerPtr mgr,
virDomainDefPtr def,
virStorageSourcePtr src,
virSecurityDomainImageLabelFlags flags)
{
virStorageSourcePtr n;
for (n = src; virStorageSourceIsBacking(n); n = n->backingStore) {
if (virSecurityDACSetImageLabelInternal(mgr, def, n, src) < 0)
return -1;
if (!(flags & VIR_SECURITY_DOMAIN_IMAGE_LABEL_BACKING_CHAIN))
break;
}
return 0;
}
static int
virSecurityDACRestoreImageLabelInt(virSecurityManagerPtr mgr,
virDomainDefPtr def,
virStorageSourcePtr src,
bool migrated)
{
virSecurityDACDataPtr priv = virSecurityManagerGetPrivateData(mgr);
virSecurityLabelDefPtr secdef;
virSecurityDeviceLabelDefPtr disk_seclabel;
if (!priv->dynamicOwnership)
return 0;
/* Don't restore labels on readoly/shared disks, because other VMs may
* still be accessing these. Alternatively we could iterate over all
* running domains and try to figure out if it is in use, but this would
* not work for clustered filesystems, since we can't see running VMs using
* the file on other nodes. Safest bet is thus to skip the restore step. */
if (src->readonly || src->shared)
return 0;
secdef = virDomainDefGetSecurityLabelDef(def, SECURITY_DAC_NAME);
if (secdef && !secdef->relabel)
return 0;
disk_seclabel = virStorageSourceGetSecurityLabelDef(src,
SECURITY_DAC_NAME);
if (disk_seclabel && !disk_seclabel->relabel)
return 0;
/* If we have a shared FS and are doing migration, we must not change
* ownership, because that kills access on the destination host which is
* sub-optimal for the guest VM's I/O attempts :-) */
if (migrated) {
int rc = 1;
if (virStorageSourceIsLocalStorage(src)) {
if (!src->path)
return 0;
if ((rc = virFileIsSharedFS(src->path)) < 0)
return -1;
}
if (rc == 1) {
VIR_DEBUG("Skipping image label restore on %s because FS is shared",
src->path);
return 0;
}
}
return virSecurityDACRestoreFileLabelInternal(mgr, src, NULL, true);
}
static int
virSecurityDACRestoreImageLabel(virSecurityManagerPtr mgr,
virDomainDefPtr def,
virStorageSourcePtr src,
virSecurityDomainImageLabelFlags flags ATTRIBUTE_UNUSED)
{
return virSecurityDACRestoreImageLabelInt(mgr, def, src, false);
}
struct virSecurityDACMoveImageMetadataData {
virSecurityManagerPtr mgr;
const char *src;
const char *dst;
};
static int
virSecurityDACMoveImageMetadataHelper(pid_t pid ATTRIBUTE_UNUSED,
void *opaque)
{
struct virSecurityDACMoveImageMetadataData *data = opaque;
const char *paths[2] = { data->src, data->dst };
virSecurityManagerMetadataLockStatePtr state;
int ret;
if (!(state = virSecurityManagerMetadataLock(data->mgr, paths, ARRAY_CARDINALITY(paths))))
return -1;
ret = virSecurityMoveRememberedLabel(SECURITY_DAC_NAME, data->src, data->dst);
virSecurityManagerMetadataUnlock(data->mgr, &state);
return ret;
}
static int
virSecurityDACMoveImageMetadata(virSecurityManagerPtr mgr,
pid_t pid,
virStorageSourcePtr src,
virStorageSourcePtr dst)
{
virSecurityDACDataPtr priv = virSecurityManagerGetPrivateData(mgr);
struct virSecurityDACMoveImageMetadataData data = { .mgr = mgr, 0 };
int rc;
/* If dynamicOwnership is turned off, or owner remembering is
* not enabled there's nothing for us to do. */
if (!priv->dynamicOwnership)
return 0;
if (src && virStorageSourceIsLocalStorage(src))
data.src = src->path;
if (dst && virStorageSourceIsLocalStorage(dst))
data.dst = dst->path;
if (!data.src)
return 0;
if (pid == -1) {
rc = virProcessRunInFork(virSecurityDACMoveImageMetadataHelper, &data);
} else {
rc = virProcessRunInMountNamespace(pid,
virSecurityDACMoveImageMetadataHelper,
&data);
}
return rc;
}
static int
virSecurityDACSetHostdevLabelHelper(const char *file,
void *opaque)
{
virSecurityDACCallbackDataPtr cbdata = opaque;
virSecurityManagerPtr mgr = cbdata->manager;
virSecurityLabelDefPtr secdef = cbdata->secdef;
virSecurityDACDataPtr priv = virSecurityManagerGetPrivateData(mgr);
uid_t user;
gid_t group;
if (virSecurityDACGetIds(secdef, priv, &user, &group, NULL, NULL) < 0)
return -1;
return virSecurityDACSetOwnership(mgr, NULL, file, user, group, true);
}
static int
virSecurityDACSetPCILabel(virPCIDevicePtr dev ATTRIBUTE_UNUSED,
const char *file,
void *opaque)
{
return virSecurityDACSetHostdevLabelHelper(file, opaque);
}
static int
virSecurityDACSetUSBLabel(virUSBDevicePtr dev ATTRIBUTE_UNUSED,
const char *file,
void *opaque)
{
return virSecurityDACSetHostdevLabelHelper(file, opaque);
}
static int
virSecurityDACSetSCSILabel(virSCSIDevicePtr dev ATTRIBUTE_UNUSED,
const char *file,
void *opaque)
{
return virSecurityDACSetHostdevLabelHelper(file, opaque);
}
static int
virSecurityDACSetHostLabel(virSCSIVHostDevicePtr dev ATTRIBUTE_UNUSED,
const char *file,
void *opaque)
{
return virSecurityDACSetHostdevLabelHelper(file, opaque);
}
static int
virSecurityDACSetHostdevLabel(virSecurityManagerPtr mgr,
virDomainDefPtr def,
virDomainHostdevDefPtr dev,
const char *vroot)
{
virSecurityDACDataPtr priv = virSecurityManagerGetPrivateData(mgr);
virSecurityDACCallbackData cbdata;
virDomainHostdevSubsysUSBPtr usbsrc = &dev->source.subsys.u.usb;
virDomainHostdevSubsysPCIPtr pcisrc = &dev->source.subsys.u.pci;
virDomainHostdevSubsysSCSIPtr scsisrc = &dev->source.subsys.u.scsi;
virDomainHostdevSubsysSCSIVHostPtr hostsrc = &dev->source.subsys.u.scsi_host;
virDomainHostdevSubsysMediatedDevPtr mdevsrc = &dev->source.subsys.u.mdev;
int ret = -1;
if (!priv->dynamicOwnership)
return 0;
if (dev->mode != VIR_DOMAIN_HOSTDEV_MODE_SUBSYS)
return 0;
/* Like virSecurityDACSetImageLabel() for a networked disk,
* do nothing for an iSCSI hostdev
*/
if (dev->source.subsys.type == VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_SCSI &&
scsisrc->protocol == VIR_DOMAIN_HOSTDEV_SCSI_PROTOCOL_TYPE_ISCSI)
return 0;
cbdata.manager = mgr;
cbdata.secdef = virDomainDefGetSecurityLabelDef(def, SECURITY_DAC_NAME);
if (cbdata.secdef && !cbdata.secdef->relabel)
return 0;
switch ((virDomainHostdevSubsysType)dev->source.subsys.type) {
case VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_USB: {
virUSBDevicePtr usb;
if (dev->missing)
return 0;
if (!(usb = virUSBDeviceNew(usbsrc->bus, usbsrc->device, vroot)))
goto done;
ret = virUSBDeviceFileIterate(usb,
virSecurityDACSetUSBLabel,
&cbdata);
virUSBDeviceFree(usb);
break;
}
case VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_PCI: {
virPCIDevicePtr pci =
virPCIDeviceNew(pcisrc->addr.domain, pcisrc->addr.bus,
pcisrc->addr.slot, pcisrc->addr.function);
if (!pci)
goto done;
if (pcisrc->backend == VIR_DOMAIN_HOSTDEV_PCI_BACKEND_VFIO) {
char *vfioGroupDev = virPCIDeviceGetIOMMUGroupDev(pci);
if (!vfioGroupDev) {
virPCIDeviceFree(pci);
goto done;
}
ret = virSecurityDACSetPCILabel(pci, vfioGroupDev, &cbdata);
VIR_FREE(vfioGroupDev);
} else {
ret = virPCIDeviceFileIterate(pci,
virSecurityDACSetPCILabel,
&cbdata);
}
virPCIDeviceFree(pci);
break;
}
case VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_SCSI: {
virDomainHostdevSubsysSCSIHostPtr scsihostsrc = &scsisrc->u.host;
virSCSIDevicePtr scsi =
virSCSIDeviceNew(NULL,
scsihostsrc->adapter, scsihostsrc->bus,
scsihostsrc->target, scsihostsrc->unit,
dev->readonly, dev->shareable);
if (!scsi)
goto done;
ret = virSCSIDeviceFileIterate(scsi,
virSecurityDACSetSCSILabel,
&cbdata);
virSCSIDeviceFree(scsi);
break;
}
case VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_SCSI_HOST: {
virSCSIVHostDevicePtr host = virSCSIVHostDeviceNew(hostsrc->wwpn);
if (!host)
goto done;
ret = virSCSIVHostDeviceFileIterate(host,
virSecurityDACSetHostLabel,
&cbdata);
virSCSIVHostDeviceFree(host);
break;
}
case VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_MDEV: {
char *vfiodev = NULL;
if (!(vfiodev = virMediatedDeviceGetIOMMUGroupDev(mdevsrc->uuidstr)))
goto done;
ret = virSecurityDACSetHostdevLabelHelper(vfiodev, &cbdata);
VIR_FREE(vfiodev);
break;
}
case VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_LAST:
ret = 0;
break;
}
done:
return ret;
}
static int
virSecurityDACRestorePCILabel(virPCIDevicePtr dev ATTRIBUTE_UNUSED,
const char *file,
void *opaque)
{
virSecurityManagerPtr mgr = opaque;
return virSecurityDACRestoreFileLabel(mgr, file);
}
static int
virSecurityDACRestoreUSBLabel(virUSBDevicePtr dev ATTRIBUTE_UNUSED,
const char *file,
void *opaque)
{
virSecurityManagerPtr mgr = opaque;
return virSecurityDACRestoreFileLabel(mgr, file);
}
static int
virSecurityDACRestoreSCSILabel(virSCSIDevicePtr dev ATTRIBUTE_UNUSED,
const char *file,
void *opaque)
{
virSecurityManagerPtr mgr = opaque;
return virSecurityDACRestoreFileLabel(mgr, file);
}
static int
virSecurityDACRestoreHostLabel(virSCSIVHostDevicePtr dev ATTRIBUTE_UNUSED,
const char *file,
void *opaque)
{
virSecurityManagerPtr mgr = opaque;
return virSecurityDACRestoreFileLabel(mgr, file);
}
static int
virSecurityDACRestoreHostdevLabel(virSecurityManagerPtr mgr,
virDomainDefPtr def,
virDomainHostdevDefPtr dev,
const char *vroot)
{
virSecurityDACDataPtr priv = virSecurityManagerGetPrivateData(mgr);
virSecurityLabelDefPtr secdef;
virDomainHostdevSubsysUSBPtr usbsrc = &dev->source.subsys.u.usb;
virDomainHostdevSubsysPCIPtr pcisrc = &dev->source.subsys.u.pci;
virDomainHostdevSubsysSCSIPtr scsisrc = &dev->source.subsys.u.scsi;
virDomainHostdevSubsysSCSIVHostPtr hostsrc = &dev->source.subsys.u.scsi_host;
virDomainHostdevSubsysMediatedDevPtr mdevsrc = &dev->source.subsys.u.mdev;
int ret = -1;
secdef = virDomainDefGetSecurityLabelDef(def, SECURITY_DAC_NAME);
if (!priv->dynamicOwnership || (secdef && !secdef->relabel))
return 0;
if (dev->mode != VIR_DOMAIN_HOSTDEV_MODE_SUBSYS)
return 0;
/* Like virSecurityDACRestoreImageLabelInt() for a networked disk,
* do nothing for an iSCSI hostdev
*/
if (dev->source.subsys.type == VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_SCSI &&
scsisrc->protocol == VIR_DOMAIN_HOSTDEV_SCSI_PROTOCOL_TYPE_ISCSI)
return 0;
switch ((virDomainHostdevSubsysType)dev->source.subsys.type) {
case VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_USB: {
virUSBDevicePtr usb;
if (dev->missing)
return 0;
if (!(usb = virUSBDeviceNew(usbsrc->bus, usbsrc->device, vroot)))
goto done;
ret = virUSBDeviceFileIterate(usb, virSecurityDACRestoreUSBLabel, mgr);
virUSBDeviceFree(usb);
break;
}
case VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_PCI: {
virPCIDevicePtr pci =
virPCIDeviceNew(pcisrc->addr.domain, pcisrc->addr.bus,
pcisrc->addr.slot, pcisrc->addr.function);
if (!pci)
goto done;
if (pcisrc->backend == VIR_DOMAIN_HOSTDEV_PCI_BACKEND_VFIO) {
char *vfioGroupDev = virPCIDeviceGetIOMMUGroupDev(pci);
if (!vfioGroupDev) {
virPCIDeviceFree(pci);
goto done;
}
ret = virSecurityDACRestorePCILabel(pci, vfioGroupDev, mgr);
VIR_FREE(vfioGroupDev);
} else {
ret = virPCIDeviceFileIterate(pci, virSecurityDACRestorePCILabel, mgr);
}
virPCIDeviceFree(pci);
break;
}
case VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_SCSI: {
virDomainHostdevSubsysSCSIHostPtr scsihostsrc = &scsisrc->u.host;
virSCSIDevicePtr scsi =
virSCSIDeviceNew(NULL,
scsihostsrc->adapter, scsihostsrc->bus,
scsihostsrc->target, scsihostsrc->unit,
dev->readonly, dev->shareable);
if (!scsi)
goto done;
ret = virSCSIDeviceFileIterate(scsi, virSecurityDACRestoreSCSILabel, mgr);
virSCSIDeviceFree(scsi);
break;
}
case VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_SCSI_HOST: {
virSCSIVHostDevicePtr host = virSCSIVHostDeviceNew(hostsrc->wwpn);
if (!host)
goto done;
ret = virSCSIVHostDeviceFileIterate(host,
virSecurityDACRestoreHostLabel,
mgr);
virSCSIVHostDeviceFree(host);
break;
}
case VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_MDEV: {
char *vfiodev = NULL;
if (!(vfiodev = virMediatedDeviceGetIOMMUGroupDev(mdevsrc->uuidstr)))
goto done;
ret = virSecurityDACRestoreFileLabel(mgr, vfiodev);
VIR_FREE(vfiodev);
break;
}
case VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_LAST:
ret = 0;
break;
}
done:
return ret;
}
static int
virSecurityDACSetChardevLabel(virSecurityManagerPtr mgr,
virDomainDefPtr def,
virDomainChrSourceDefPtr dev_source,
bool chardevStdioLogd)
{
virSecurityDACDataPtr priv = virSecurityManagerGetPrivateData(mgr);
virSecurityLabelDefPtr seclabel;
virSecurityDeviceLabelDefPtr chr_seclabel = NULL;
char *in = NULL, *out = NULL;
int ret = -1;
uid_t user;
gid_t group;
seclabel = virDomainDefGetSecurityLabelDef(def, SECURITY_DAC_NAME);
chr_seclabel = virDomainChrSourceDefGetSecurityLabelDef(dev_source,
SECURITY_DAC_NAME);
if (chr_seclabel && !chr_seclabel->relabel)
return 0;
if (!chr_seclabel &&
dev_source->type == VIR_DOMAIN_CHR_TYPE_FILE &&
chardevStdioLogd)
return 0;
if (chr_seclabel && chr_seclabel->label) {
if (virParseOwnershipIds(chr_seclabel->label, &user, &group) < 0)
return -1;
} else {
if (virSecurityDACGetIds(seclabel, priv, &user, &group, NULL, NULL) < 0)
return -1;
}
switch ((virDomainChrType)dev_source->type) {
case VIR_DOMAIN_CHR_TYPE_DEV:
case VIR_DOMAIN_CHR_TYPE_FILE:
ret = virSecurityDACSetOwnership(mgr, NULL,
dev_source->data.file.path,
user, group, true);
break;
case VIR_DOMAIN_CHR_TYPE_PIPE:
if (virAsprintf(&in, "%s.in", dev_source->data.file.path) < 0 ||
virAsprintf(&out, "%s.out", dev_source->data.file.path) < 0)
goto done;
if (virFileExists(in) && virFileExists(out)) {
if (virSecurityDACSetOwnership(mgr, NULL, in, user, group, true) < 0 ||
virSecurityDACSetOwnership(mgr, NULL, out, user, group, true) < 0)
goto done;
} else if (virSecurityDACSetOwnership(mgr, NULL,
dev_source->data.file.path,
user, group, true) < 0) {
goto done;
}
ret = 0;
break;
case VIR_DOMAIN_CHR_TYPE_UNIX:
if (!dev_source->data.nix.listen ||
(dev_source->data.nix.path &&
virFileExists(dev_source->data.nix.path))) {
/* Also label mode='bind' sockets if they exist,
* e.g. because they were created by libvirt
* and passed via FD */
if (virSecurityDACSetOwnership(mgr, NULL,
dev_source->data.nix.path,
user, group, true) < 0)
goto done;
}
ret = 0;
break;
case VIR_DOMAIN_CHR_TYPE_SPICEPORT:
case VIR_DOMAIN_CHR_TYPE_NULL:
case VIR_DOMAIN_CHR_TYPE_VC:
case VIR_DOMAIN_CHR_TYPE_PTY:
case VIR_DOMAIN_CHR_TYPE_STDIO:
case VIR_DOMAIN_CHR_TYPE_UDP:
case VIR_DOMAIN_CHR_TYPE_TCP:
case VIR_DOMAIN_CHR_TYPE_SPICEVMC:
case VIR_DOMAIN_CHR_TYPE_NMDM:
case VIR_DOMAIN_CHR_TYPE_LAST:
ret = 0;
break;
}
done:
VIR_FREE(in);
VIR_FREE(out);
return ret;
}
static int
virSecurityDACRestoreChardevLabel(virSecurityManagerPtr mgr,
virDomainDefPtr def ATTRIBUTE_UNUSED,
virDomainChrSourceDefPtr dev_source,
bool chardevStdioLogd)
{
virSecurityDeviceLabelDefPtr chr_seclabel = NULL;
char *in = NULL, *out = NULL;
int ret = -1;
chr_seclabel = virDomainChrSourceDefGetSecurityLabelDef(dev_source,
SECURITY_DAC_NAME);
if (chr_seclabel && !chr_seclabel->relabel)
return 0;
if (!chr_seclabel &&
dev_source->type == VIR_DOMAIN_CHR_TYPE_FILE &&
chardevStdioLogd)
return 0;
switch ((virDomainChrType)dev_source->type) {
case VIR_DOMAIN_CHR_TYPE_DEV:
case VIR_DOMAIN_CHR_TYPE_FILE:
ret = virSecurityDACRestoreFileLabel(mgr, dev_source->data.file.path);
break;
case VIR_DOMAIN_CHR_TYPE_PIPE:
if (virAsprintf(&out, "%s.out", dev_source->data.file.path) < 0 ||
virAsprintf(&in, "%s.in", dev_source->data.file.path) < 0)
goto done;
if (virFileExists(in) && virFileExists(out)) {
if (virSecurityDACRestoreFileLabel(mgr, out) < 0 ||
virSecurityDACRestoreFileLabel(mgr, in) < 0)
goto done;
} else if (virSecurityDACRestoreFileLabel(mgr, dev_source->data.file.path) < 0) {
goto done;
}
ret = 0;
break;
case VIR_DOMAIN_CHR_TYPE_UNIX:
if (!dev_source->data.nix.listen &&
virSecurityDACRestoreFileLabel(mgr, dev_source->data.nix.path) < 0) {
goto done;
}
ret = 0;
break;
case VIR_DOMAIN_CHR_TYPE_NULL:
case VIR_DOMAIN_CHR_TYPE_VC:
case VIR_DOMAIN_CHR_TYPE_PTY:
case VIR_DOMAIN_CHR_TYPE_STDIO:
case VIR_DOMAIN_CHR_TYPE_UDP:
case VIR_DOMAIN_CHR_TYPE_TCP:
case VIR_DOMAIN_CHR_TYPE_SPICEVMC:
case VIR_DOMAIN_CHR_TYPE_SPICEPORT:
case VIR_DOMAIN_CHR_TYPE_NMDM:
case VIR_DOMAIN_CHR_TYPE_LAST:
ret = 0;
break;
}
done:
VIR_FREE(in);
VIR_FREE(out);
return ret;
}
struct _virSecuritySELinuxChardevCallbackData {
virSecurityManagerPtr mgr;
bool chardevStdioLogd;
};
static int
virSecurityDACRestoreChardevCallback(virDomainDefPtr def,
virDomainChrDefPtr dev ATTRIBUTE_UNUSED,
void *opaque)
{
struct _virSecuritySELinuxChardevCallbackData *data = opaque;
return virSecurityDACRestoreChardevLabel(data->mgr, def, dev->source,
data->chardevStdioLogd);
}
static int
virSecurityDACSetTPMFileLabel(virSecurityManagerPtr mgr,
virDomainDefPtr def,
virDomainTPMDefPtr tpm)
{
int ret = 0;
switch (tpm->type) {
case VIR_DOMAIN_TPM_TYPE_PASSTHROUGH:
ret = virSecurityDACSetChardevLabel(mgr, def,
&tpm->data.passthrough.source,
false);
break;
case VIR_DOMAIN_TPM_TYPE_EMULATOR:
ret = virSecurityDACSetChardevLabel(mgr, def,
&tpm->data.emulator.source,
false);
break;
case VIR_DOMAIN_TPM_TYPE_LAST:
break;
}
return ret;
}
static int
virSecurityDACRestoreTPMFileLabel(virSecurityManagerPtr mgr,
virDomainDefPtr def,
virDomainTPMDefPtr tpm)
{
int ret = 0;
switch (tpm->type) {
case VIR_DOMAIN_TPM_TYPE_PASSTHROUGH:
ret = virSecurityDACRestoreChardevLabel(mgr, def,
&tpm->data.passthrough.source,
false);
break;
case VIR_DOMAIN_TPM_TYPE_EMULATOR:
/* swtpm will have removed the Unix socket upon termination */
case VIR_DOMAIN_TPM_TYPE_LAST:
break;
}
return ret;
}
static int
virSecurityDACSetGraphicsLabel(virSecurityManagerPtr mgr,
virDomainDefPtr def,
virDomainGraphicsDefPtr gfx)
{
const char *rendernode = virDomainGraphicsGetRenderNode(gfx);
virSecurityDACDataPtr priv = virSecurityManagerGetPrivateData(mgr);
virSecurityLabelDefPtr seclabel;
uid_t user;
gid_t group;
/* There's nothing to relabel */
if (!rendernode)
return 0;
/* Skip chowning the shared render file if namespaces are disabled */
if (!priv->mountNamespace)
return 0;
seclabel = virDomainDefGetSecurityLabelDef(def, SECURITY_DAC_NAME);
if (seclabel && !seclabel->relabel)
return 0;
if (virSecurityDACGetIds(seclabel, priv, &user, &group, NULL, NULL) < 0)
return -1;
if (virSecurityDACSetOwnership(mgr, NULL, rendernode, user, group, true) < 0)
return -1;
return 0;
}
static int
virSecurityDACRestoreGraphicsLabel(virSecurityManagerPtr mgr ATTRIBUTE_UNUSED,
virDomainDefPtr def ATTRIBUTE_UNUSED,
virDomainGraphicsDefPtr gfx ATTRIBUTE_UNUSED)
{
/* The only graphics labelling we do is dependent on mountNamespaces,
in which case 'restoring' the label doesn't actually accomplish
anything, so there's nothing to do here */
return 0;
}
static int
virSecurityDACSetInputLabel(virSecurityManagerPtr mgr,
virDomainDefPtr def,
virDomainInputDefPtr input)
{
virSecurityDACDataPtr priv = virSecurityManagerGetPrivateData(mgr);
virSecurityLabelDefPtr seclabel;
int ret = -1;
uid_t user;
gid_t group;
seclabel = virDomainDefGetSecurityLabelDef(def, SECURITY_DAC_NAME);
if (seclabel && !seclabel->relabel)
return 0;
switch ((virDomainInputType)input->type) {
case VIR_DOMAIN_INPUT_TYPE_PASSTHROUGH:
if (virSecurityDACGetIds(seclabel, priv, &user, &group, NULL, NULL) < 0)
return -1;
ret = virSecurityDACSetOwnership(mgr, NULL,
input->source.evdev,
user, group, true);
break;
case VIR_DOMAIN_INPUT_TYPE_MOUSE:
case VIR_DOMAIN_INPUT_TYPE_TABLET:
case VIR_DOMAIN_INPUT_TYPE_KBD:
case VIR_DOMAIN_INPUT_TYPE_LAST:
ret = 0;
break;
}
return ret;
}
static int
virSecurityDACRestoreInputLabel(virSecurityManagerPtr mgr,
virDomainDefPtr def ATTRIBUTE_UNUSED,
virDomainInputDefPtr input)
{
int ret = -1;
switch ((virDomainInputType)input->type) {
case VIR_DOMAIN_INPUT_TYPE_PASSTHROUGH:
ret = virSecurityDACRestoreFileLabel(mgr, input->source.evdev);
break;
case VIR_DOMAIN_INPUT_TYPE_MOUSE:
case VIR_DOMAIN_INPUT_TYPE_TABLET:
case VIR_DOMAIN_INPUT_TYPE_KBD:
case VIR_DOMAIN_INPUT_TYPE_LAST:
ret = 0;
break;
}
return ret;
}
static int
virSecurityDACRestoreMemoryLabel(virSecurityManagerPtr mgr,
virDomainDefPtr def ATTRIBUTE_UNUSED,
virDomainMemoryDefPtr mem)
{
int ret = -1;
switch ((virDomainMemoryModel) mem->model) {
case VIR_DOMAIN_MEMORY_MODEL_NVDIMM:
ret = virSecurityDACRestoreFileLabel(mgr, mem->nvdimmPath);
break;
case VIR_DOMAIN_MEMORY_MODEL_DIMM:
case VIR_DOMAIN_MEMORY_MODEL_LAST:
case VIR_DOMAIN_MEMORY_MODEL_NONE:
ret = 0;
break;
}
return ret;
}
static int
virSecurityDACRestoreSEVLabel(virSecurityManagerPtr mgr ATTRIBUTE_UNUSED,
virDomainDefPtr def ATTRIBUTE_UNUSED)
{
/* we only label /dev/sev when running with namespaces, so we don't need to
* restore anything */
return 0;
}
static int
virSecurityDACRestoreAllLabel(virSecurityManagerPtr mgr,
virDomainDefPtr def,
bool migrated,
bool chardevStdioLogd)
{
virSecurityDACDataPtr priv = virSecurityManagerGetPrivateData(mgr);
virSecurityLabelDefPtr secdef;
size_t i;
int rc = 0;
secdef = virDomainDefGetSecurityLabelDef(def, SECURITY_DAC_NAME);
if (!priv->dynamicOwnership || (secdef && !secdef->relabel))
return 0;
VIR_DEBUG("Restoring security label on %s migrated=%d",
def->name, migrated);
for (i = 0; i < def->ndisks; i++) {
if (virSecurityDACRestoreImageLabelInt(mgr,
def,
def->disks[i]->src,
migrated) < 0)
rc = -1;
}
for (i = 0; i < def->ngraphics; i++) {
if (virSecurityDACRestoreGraphicsLabel(mgr, def, def->graphics[i]) < 0)
return -1;
}
for (i = 0; i < def->ninputs; i++) {
if (virSecurityDACRestoreInputLabel(mgr, def, def->inputs[i]) < 0)
rc = -1;
}
for (i = 0; i < def->nhostdevs; i++) {
if (virSecurityDACRestoreHostdevLabel(mgr,
def,
def->hostdevs[i],
NULL) < 0)
rc = -1;
}
for (i = 0; i < def->nmems; i++) {
if (virSecurityDACRestoreMemoryLabel(mgr,
def,
def->mems[i]) < 0)
rc = -1;
}
struct _virSecuritySELinuxChardevCallbackData chardevData = {
.mgr = mgr,
.chardevStdioLogd = chardevStdioLogd,
};
if (virDomainChrDefForeach(def,
false,
virSecurityDACRestoreChardevCallback,
&chardevData) < 0)
rc = -1;
if (def->tpm) {
if (virSecurityDACRestoreTPMFileLabel(mgr,
def,
def->tpm) < 0)
rc = -1;
}
if (def->sev) {
if (virSecurityDACRestoreSEVLabel(mgr, def) < 0)
rc = -1;
}
if (def->os.loader && def->os.loader->nvram &&
virSecurityDACRestoreFileLabel(mgr, def->os.loader->nvram) < 0)
rc = -1;
if (def->os.kernel &&
virSecurityDACRestoreFileLabel(mgr, def->os.kernel) < 0)
rc = -1;
if (def->os.initrd &&
virSecurityDACRestoreFileLabel(mgr, def->os.initrd) < 0)
rc = -1;
if (def->os.dtb &&
virSecurityDACRestoreFileLabel(mgr, def->os.dtb) < 0)
rc = -1;
if (def->os.slic_table &&
virSecurityDACRestoreFileLabel(mgr, def->os.slic_table) < 0)
rc = -1;
return rc;
}
static int
virSecurityDACSetChardevCallback(virDomainDefPtr def,
virDomainChrDefPtr dev ATTRIBUTE_UNUSED,
void *opaque)
{
struct _virSecuritySELinuxChardevCallbackData *data = opaque;
return virSecurityDACSetChardevLabel(data->mgr, def, dev->source,
data->chardevStdioLogd);
}
static int
virSecurityDACSetMemoryLabel(virSecurityManagerPtr mgr,
virDomainDefPtr def,
virDomainMemoryDefPtr mem)
{
virSecurityDACDataPtr priv = virSecurityManagerGetPrivateData(mgr);
virSecurityLabelDefPtr seclabel;
int ret = -1;
uid_t user;
gid_t group;
switch ((virDomainMemoryModel) mem->model) {
case VIR_DOMAIN_MEMORY_MODEL_NVDIMM:
seclabel = virDomainDefGetSecurityLabelDef(def, SECURITY_DAC_NAME);
if (seclabel && !seclabel->relabel)
return 0;
if (virSecurityDACGetIds(seclabel, priv, &user, &group, NULL, NULL) < 0)
return -1;
ret = virSecurityDACSetOwnership(mgr, NULL,
mem->nvdimmPath,
user, group, true);
break;
case VIR_DOMAIN_MEMORY_MODEL_DIMM:
case VIR_DOMAIN_MEMORY_MODEL_LAST:
case VIR_DOMAIN_MEMORY_MODEL_NONE:
ret = 0;
break;
}
return ret;
}
static int
virSecurityDACSetSEVLabel(virSecurityManagerPtr mgr,
virDomainDefPtr def)
{
virSecurityDACDataPtr priv = virSecurityManagerGetPrivateData(mgr);
virSecurityLabelDefPtr seclabel;
uid_t user;
gid_t group;
/* Skip chowning /dev/sev if namespaces are disabled as we'd significantly
* increase the chance of a DOS attack on SEV
*/
if (!priv->mountNamespace)
return 0;
seclabel = virDomainDefGetSecurityLabelDef(def, SECURITY_DAC_NAME);
if (seclabel && !seclabel->relabel)
return 0;
if (virSecurityDACGetIds(seclabel, priv, &user, &group, NULL, NULL) < 0)
return -1;
if (virSecurityDACSetOwnership(mgr, NULL, DEV_SEV,
user, group, true) < 0)
return -1;
return 0;
}
static int
virSecurityDACSetAllLabel(virSecurityManagerPtr mgr,
virDomainDefPtr def,
const char *stdin_path ATTRIBUTE_UNUSED,
bool chardevStdioLogd)
{
virSecurityDACDataPtr priv = virSecurityManagerGetPrivateData(mgr);
virSecurityLabelDefPtr secdef;
size_t i;
uid_t user;
gid_t group;
secdef = virDomainDefGetSecurityLabelDef(def, SECURITY_DAC_NAME);
if (!priv->dynamicOwnership || (secdef && !secdef->relabel))
return 0;
for (i = 0; i < def->ndisks; i++) {
/* XXX fixme - we need to recursively label the entire tree :-( */
if (virDomainDiskGetType(def->disks[i]) == VIR_STORAGE_TYPE_DIR)
continue;
if (virSecurityDACSetImageLabel(mgr, def, def->disks[i]->src,
VIR_SECURITY_DOMAIN_IMAGE_LABEL_BACKING_CHAIN) < 0)
return -1;
}
for (i = 0; i < def->ngraphics; i++) {
if (virSecurityDACSetGraphicsLabel(mgr, def, def->graphics[i]) < 0)
return -1;
}
for (i = 0; i < def->ninputs; i++) {
if (virSecurityDACSetInputLabel(mgr, def, def->inputs[i]) < 0)
return -1;
}
for (i = 0; i < def->nhostdevs; i++) {
if (virSecurityDACSetHostdevLabel(mgr,
def,
def->hostdevs[i],
NULL) < 0)
return -1;
}
for (i = 0; i < def->nmems; i++) {
if (virSecurityDACSetMemoryLabel(mgr,
def,
def->mems[i]) < 0)
return -1;
}
struct _virSecuritySELinuxChardevCallbackData chardevData = {
.mgr = mgr,
.chardevStdioLogd = chardevStdioLogd,
};
if (virDomainChrDefForeach(def,
true,
virSecurityDACSetChardevCallback,
&chardevData) < 0)
return -1;
if (def->tpm) {
if (virSecurityDACSetTPMFileLabel(mgr,
def,
def->tpm) < 0)
return -1;
}
if (def->sev) {
if (virSecurityDACSetSEVLabel(mgr, def) < 0)
return -1;
}
if (virSecurityDACGetImageIds(secdef, priv, &user, &group))
return -1;
if (def->os.loader && def->os.loader->nvram &&
virSecurityDACSetOwnership(mgr, NULL,
def->os.loader->nvram,
user, group, true) < 0)
return -1;
if (def->os.kernel &&
virSecurityDACSetOwnership(mgr, NULL,
def->os.kernel,
user, group, true) < 0)
return -1;
if (def->os.initrd &&
virSecurityDACSetOwnership(mgr, NULL,
def->os.initrd,
user, group, true) < 0)
return -1;
if (def->os.dtb &&
virSecurityDACSetOwnership(mgr, NULL,
def->os.dtb,
user, group, true) < 0)
return -1;
if (def->os.slic_table &&
virSecurityDACSetOwnership(mgr, NULL,
def->os.slic_table,
user, group, true) < 0)
return -1;
return 0;
}
static int
virSecurityDACSetSavedStateLabel(virSecurityManagerPtr mgr,
virDomainDefPtr def,
const char *savefile)
{
virSecurityDACDataPtr priv = virSecurityManagerGetPrivateData(mgr);
virSecurityLabelDefPtr secdef;
uid_t user;
gid_t group;
secdef = virDomainDefGetSecurityLabelDef(def, SECURITY_DAC_NAME);
if (virSecurityDACGetImageIds(secdef, priv, &user, &group) < 0)
return -1;
return virSecurityDACSetOwnership(mgr, NULL, savefile, user, group, true);
}
static int
virSecurityDACRestoreSavedStateLabel(virSecurityManagerPtr mgr,
virDomainDefPtr def ATTRIBUTE_UNUSED,
const char *savefile)
{
virSecurityDACDataPtr priv = virSecurityManagerGetPrivateData(mgr);
if (!priv->dynamicOwnership)
return 0;
return virSecurityDACRestoreFileLabel(mgr, savefile);
}
static int
virSecurityDACSetProcessLabel(virSecurityManagerPtr mgr,
virDomainDefPtr def)
{
virSecurityDACDataPtr priv = virSecurityManagerGetPrivateData(mgr);
virSecurityLabelDefPtr secdef;
uid_t user;
gid_t group;
gid_t *groups;
int ngroups;
secdef = virDomainDefGetSecurityLabelDef(def, SECURITY_DAC_NAME);
if (virSecurityDACGetIds(secdef, priv, &user, &group, &groups, &ngroups) < 0)
return -1;
VIR_DEBUG("Dropping privileges to %u:%u, %d supplemental groups",
(unsigned int)user, (unsigned int)group, ngroups);
if (virSetUIDGID(user, group, groups, ngroups) < 0)
return -1;
return 0;
}
static int
virSecurityDACSetChildProcessLabel(virSecurityManagerPtr mgr,
virDomainDefPtr def,
virCommandPtr cmd)
{
virSecurityDACDataPtr priv = virSecurityManagerGetPrivateData(mgr);
virSecurityLabelDefPtr secdef;
uid_t user;
gid_t group;
secdef = virDomainDefGetSecurityLabelDef(def, SECURITY_DAC_NAME);
if (virSecurityDACGetIds(secdef, priv, &user, &group, NULL, NULL) < 0)
return -1;
VIR_DEBUG("Setting child to drop privileges to %u:%u",
(unsigned int)user, (unsigned int)group);
virCommandSetUID(cmd, user);
virCommandSetGID(cmd, group);
return 0;
}
static int
virSecurityDACVerify(virSecurityManagerPtr mgr ATTRIBUTE_UNUSED,
virDomainDefPtr def ATTRIBUTE_UNUSED)
{
return 0;
}
static int
virSecurityDACGenLabel(virSecurityManagerPtr mgr,
virDomainDefPtr def)
{
int rc = -1;
virSecurityLabelDefPtr seclabel;
virSecurityDACDataPtr priv = virSecurityManagerGetPrivateData(mgr);
seclabel = virDomainDefGetSecurityLabelDef(def, SECURITY_DAC_NAME);
if (seclabel == NULL)
return rc;
if (seclabel->imagelabel) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("security image label already "
"defined for VM"));
return rc;
}
if (seclabel->model
&& STRNEQ(seclabel->model, SECURITY_DAC_NAME)) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("security label model %s is not supported "
"with selinux"),
seclabel->model);
return rc;
}
switch ((virDomainSeclabelType)seclabel->type) {
case VIR_DOMAIN_SECLABEL_STATIC:
if (seclabel->label == NULL) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("missing label for static security "
"driver in domain %s"), def->name);
return rc;
}
break;
case VIR_DOMAIN_SECLABEL_DYNAMIC:
if (virAsprintf(&seclabel->label, "+%u:+%u",
(unsigned int)priv->user,
(unsigned int)priv->group) < 0)
return rc;
if (seclabel->label == NULL) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("cannot generate dac user and group id "
"for domain %s"), def->name);
return rc;
}
break;
case VIR_DOMAIN_SECLABEL_NONE:
/* no op */
return 0;
case VIR_DOMAIN_SECLABEL_DEFAULT:
case VIR_DOMAIN_SECLABEL_LAST:
virReportError(VIR_ERR_INTERNAL_ERROR,
_("unexpected security label type '%s'"),
virDomainSeclabelTypeToString(seclabel->type));
return rc;
}
if (seclabel->relabel && !seclabel->imagelabel &&
VIR_STRDUP(seclabel->imagelabel, seclabel->label) < 0) {
VIR_FREE(seclabel->label);
return rc;
}
return 0;
}
static int
virSecurityDACReleaseLabel(virSecurityManagerPtr mgr ATTRIBUTE_UNUSED,
virDomainDefPtr def ATTRIBUTE_UNUSED)
{
return 0;
}
static int
virSecurityDACReserveLabel(virSecurityManagerPtr mgr ATTRIBUTE_UNUSED,
virDomainDefPtr def ATTRIBUTE_UNUSED,
pid_t pid ATTRIBUTE_UNUSED)
{
return 0;
}
#ifdef __linux__
static int
virSecurityDACGetProcessLabelInternal(pid_t pid,
virSecurityLabelPtr seclabel)
{
struct stat sb;
char *path = NULL;
int ret = -1;
VIR_DEBUG("Getting DAC user and group on process '%d'", pid);
if (virAsprintf(&path, "/proc/%d", (int)pid) < 0)
goto cleanup;
if (lstat(path, &sb) < 0) {
virReportSystemError(errno,
_("unable to get uid and gid for PID %d via procfs"),
pid);
goto cleanup;
}
snprintf(seclabel->label, VIR_SECURITY_LABEL_BUFLEN,
"+%u:+%u", (unsigned int)sb.st_uid, (unsigned int)sb.st_gid);
ret = 0;
cleanup:
VIR_FREE(path);
return ret;
}
#elif defined(__FreeBSD__)
static int
virSecurityDACGetProcessLabelInternal(pid_t pid,
virSecurityLabelPtr seclabel)
{
struct kinfo_proc p;
int mib[4];
size_t len = 4;
sysctlnametomib("kern.proc.pid", mib, &len);
len = sizeof(struct kinfo_proc);
mib[3] = pid;
if (sysctl(mib, 4, &p, &len, NULL, 0) < 0) {
virReportSystemError(errno,
_("unable to get PID %d uid and gid via sysctl"),
pid);
return -1;
}
snprintf(seclabel->label, VIR_SECURITY_LABEL_BUFLEN,
"+%u:+%u", (unsigned int)p.ki_uid, (unsigned int)p.ki_groups[0]);
return 0;
}
#else
static int
virSecurityDACGetProcessLabelInternal(pid_t pid ATTRIBUTE_UNUSED,
virSecurityLabelPtr seclabel ATTRIBUTE_UNUSED)
{
virReportSystemError(ENOSYS, "%s",
_("Cannot get process uid and gid on this platform"));
return -1;
}
#endif
static int
virSecurityDACGetProcessLabel(virSecurityManagerPtr mgr ATTRIBUTE_UNUSED,
virDomainDefPtr def,
pid_t pid,
virSecurityLabelPtr seclabel)
{
virSecurityLabelDefPtr secdef =
virDomainDefGetSecurityLabelDef(def, SECURITY_DAC_NAME);
if (secdef == NULL) {
VIR_DEBUG("missing label for DAC security "
"driver in domain %s", def->name);
if (virSecurityDACGetProcessLabelInternal(pid, seclabel) < 0)
return -1;
return 0;
}
if (secdef->label)
ignore_value(virStrcpy(seclabel->label, secdef->label,
VIR_SECURITY_LABEL_BUFLEN));
return 0;
}
static int
virSecurityDACSetDaemonSocketLabel(virSecurityManagerPtr mgr ATTRIBUTE_UNUSED,
virDomainDefPtr vm ATTRIBUTE_UNUSED)
{
return 0;
}
static int
virSecurityDACSetSocketLabel(virSecurityManagerPtr mgr ATTRIBUTE_UNUSED,
virDomainDefPtr def ATTRIBUTE_UNUSED)
{
return 0;
}
static int
virSecurityDACClearSocketLabel(virSecurityManagerPtr mgr ATTRIBUTE_UNUSED,
virDomainDefPtr def ATTRIBUTE_UNUSED)
{
return 0;
}
static int
virSecurityDACSetImageFDLabel(virSecurityManagerPtr mgr ATTRIBUTE_UNUSED,
virDomainDefPtr def ATTRIBUTE_UNUSED,
int fd ATTRIBUTE_UNUSED)
{
return 0;
}
static int
virSecurityDACSetTapFDLabel(virSecurityManagerPtr mgr ATTRIBUTE_UNUSED,
virDomainDefPtr def ATTRIBUTE_UNUSED,
int fd ATTRIBUTE_UNUSED)
{
return 0;
}
static char *
virSecurityDACGetMountOptions(virSecurityManagerPtr mgr ATTRIBUTE_UNUSED,
virDomainDefPtr vm ATTRIBUTE_UNUSED)
{
return NULL;
}
static const char *
virSecurityDACGetBaseLabel(virSecurityManagerPtr mgr,
int virt ATTRIBUTE_UNUSED)
{
virSecurityDACDataPtr priv = virSecurityManagerGetPrivateData(mgr);
return priv->baselabel;
}
static int
virSecurityDACDomainSetPathLabel(virSecurityManagerPtr mgr,
virDomainDefPtr def,
const char *path,
bool allowSubtree ATTRIBUTE_UNUSED)
{
virSecurityDACDataPtr priv = virSecurityManagerGetPrivateData(mgr);
virSecurityLabelDefPtr seclabel;
uid_t user;
gid_t group;
seclabel = virDomainDefGetSecurityLabelDef(def, SECURITY_DAC_NAME);
if (virSecurityDACGetIds(seclabel, priv, &user, &group, NULL, NULL) < 0)
return -1;
return virSecurityDACSetOwnership(mgr, NULL, path, user, group, true);
}
virSecurityDriver virSecurityDriverDAC = {
.privateDataLen = sizeof(virSecurityDACData),
.name = SECURITY_DAC_NAME,
.probe = virSecurityDACProbe,
.open = virSecurityDACOpen,
.close = virSecurityDACClose,
.getModel = virSecurityDACGetModel,
.getDOI = virSecurityDACGetDOI,
.preFork = virSecurityDACPreFork,
.transactionStart = virSecurityDACTransactionStart,
.transactionCommit = virSecurityDACTransactionCommit,
.transactionAbort = virSecurityDACTransactionAbort,
.domainSecurityVerify = virSecurityDACVerify,
.domainSetSecurityImageLabel = virSecurityDACSetImageLabel,
.domainRestoreSecurityImageLabel = virSecurityDACRestoreImageLabel,
.domainMoveImageMetadata = virSecurityDACMoveImageMetadata,
.domainSetSecurityMemoryLabel = virSecurityDACSetMemoryLabel,
.domainRestoreSecurityMemoryLabel = virSecurityDACRestoreMemoryLabel,
.domainSetSecurityInputLabel = virSecurityDACSetInputLabel,
.domainRestoreSecurityInputLabel = virSecurityDACRestoreInputLabel,
.domainSetSecurityDaemonSocketLabel = virSecurityDACSetDaemonSocketLabel,
.domainSetSecuritySocketLabel = virSecurityDACSetSocketLabel,
.domainClearSecuritySocketLabel = virSecurityDACClearSocketLabel,
.domainGenSecurityLabel = virSecurityDACGenLabel,
.domainReserveSecurityLabel = virSecurityDACReserveLabel,
.domainReleaseSecurityLabel = virSecurityDACReleaseLabel,
.domainGetSecurityProcessLabel = virSecurityDACGetProcessLabel,
.domainSetSecurityProcessLabel = virSecurityDACSetProcessLabel,
.domainSetSecurityChildProcessLabel = virSecurityDACSetChildProcessLabel,
.domainSetSecurityAllLabel = virSecurityDACSetAllLabel,
.domainRestoreSecurityAllLabel = virSecurityDACRestoreAllLabel,
.domainSetSecurityHostdevLabel = virSecurityDACSetHostdevLabel,
.domainRestoreSecurityHostdevLabel = virSecurityDACRestoreHostdevLabel,
.domainSetSavedStateLabel = virSecurityDACSetSavedStateLabel,
.domainRestoreSavedStateLabel = virSecurityDACRestoreSavedStateLabel,
.domainSetSecurityImageFDLabel = virSecurityDACSetImageFDLabel,
.domainSetSecurityTapFDLabel = virSecurityDACSetTapFDLabel,
.domainGetSecurityMountOptions = virSecurityDACGetMountOptions,
.getBaseLabel = virSecurityDACGetBaseLabel,
.domainSetPathLabel = virSecurityDACDomainSetPathLabel,
.domainSetSecurityChardevLabel = virSecurityDACSetChardevLabel,
.domainRestoreSecurityChardevLabel = virSecurityDACRestoreChardevLabel,
};
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