security_dac.c 28.9 KB
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/*
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 * Copyright (C) 2010-2012 Red Hat, Inc.
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 *
 * 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
O
Osier Yang 已提交
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 * License along with this library;  If not, see
 * <http://www.gnu.org/licenses/>.
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 *
 * POSIX DAC security driver
 */

#include <config.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

#include "security_dac.h"
#include "virterror_internal.h"
#include "util.h"
#include "memory.h"
#include "logging.h"
#include "pci.h"
#include "hostusb.h"
#include "storage_file.h"

#define VIR_FROM_THIS VIR_FROM_SECURITY
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#define SECURITY_DAC_NAME "dac"
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typedef struct _virSecurityDACData virSecurityDACData;
typedef virSecurityDACData *virSecurityDACDataPtr;

struct _virSecurityDACData {
    uid_t user;
    gid_t group;
    bool dynamicOwnership;
};

void virSecurityDACSetUser(virSecurityManagerPtr mgr,
                           uid_t user)
{
    virSecurityDACDataPtr priv = virSecurityManagerGetPrivateData(mgr);
    priv->user = user;
}

void virSecurityDACSetGroup(virSecurityManagerPtr mgr,
                            gid_t group)
{
    virSecurityDACDataPtr priv = virSecurityManagerGetPrivateData(mgr);
    priv->group = group;
}

void virSecurityDACSetDynamicOwnership(virSecurityManagerPtr mgr,
                                       bool dynamicOwnership)
{
    virSecurityDACDataPtr priv = virSecurityManagerGetPrivateData(mgr);
    priv->dynamicOwnership = dynamicOwnership;
}

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static
int parseIds(const char *label, uid_t *uidPtr, gid_t *gidPtr)
{
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    unsigned int theuid;
    unsigned int thegid;
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    char *endptr = NULL;

    if (label == NULL)
        return -1;

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    if (virStrToLong_ui(label, &endptr, 10, &theuid) ||
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        endptr == NULL || *endptr != ':') {
        return -1;
    }

83
    if (virStrToLong_ui(endptr + 1, NULL, 10, &thegid))
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        return -1;

    if (uidPtr)
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        *uidPtr = theuid;
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    if (gidPtr)
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        *gidPtr = thegid;
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    return 0;
}

static
int virSecurityDACParseIds(virDomainDefPtr def, uid_t *uidPtr, gid_t *gidPtr)
{
    uid_t uid;
    gid_t gid;
    virSecurityLabelDefPtr seclabel;

    if (def == NULL)
        return -1;

    seclabel = virDomainDefGetSecurityLabelDef(def, SECURITY_DAC_NAME);
    if (seclabel == NULL) {
        virReportError(VIR_ERR_INTERNAL_ERROR,
                       _("security label for DAC not found in domain %s"),
                       def->name);
        return -1;
    }

    if (seclabel->label && parseIds(seclabel->label, &uid, &gid)) {
        virReportError(VIR_ERR_INTERNAL_ERROR,
                       _("failed to parse uid and gid for DAC "
                         "security driver: %s"), seclabel->label);
        return -1;
    }

    if (uidPtr)
        *uidPtr = uid;
    if (gidPtr)
        *gidPtr = gid;

    return 0;
}

static
int virSecurityDACGetIds(virDomainDefPtr def, virSecurityDACDataPtr priv,
                         uid_t *uidPtr, gid_t *gidPtr)
{
    if (virSecurityDACParseIds(def, uidPtr, gidPtr) == 0)
        return 0;

    if (priv) {
        if (uidPtr)
            *uidPtr = priv->user;
        if (gidPtr)
            *gidPtr = priv->group;
        return 0;
    }
    return -1;
}

static
int virSecurityDACParseImageIds(virDomainDefPtr def,
                                uid_t *uidPtr, gid_t *gidPtr)
{
    uid_t uid;
    gid_t gid;
    virSecurityLabelDefPtr seclabel;

    if (def == NULL)
        return -1;

    seclabel = virDomainDefGetSecurityLabelDef(def, SECURITY_DAC_NAME);
    if (seclabel == NULL) {
        virReportError(VIR_ERR_INTERNAL_ERROR,
                       _("security label for DAC not found in domain %s"),
                       def->name);
        return -1;
    }

    if (seclabel->imagelabel
        && parseIds(seclabel->imagelabel, &uid, &gid)) {
        virReportError(VIR_ERR_INTERNAL_ERROR,
                       _("failed to parse uid and gid for DAC "
                         "security driver: %s"), seclabel->label);
        return -1;
    }

    if (uidPtr)
        *uidPtr = uid;
    if (gidPtr)
        *gidPtr = gid;

    return 0;
}

static
int virSecurityDACGetImageIds(virDomainDefPtr def, virSecurityDACDataPtr priv,
                         uid_t *uidPtr, gid_t *gidPtr)
{
    if (virSecurityDACParseImageIds(def, uidPtr, gidPtr) == 0)
        return 0;

    if (priv) {
        if (uidPtr)
            *uidPtr = priv->user;
        if (gidPtr)
            *gidPtr = priv->group;
        return 0;
    }
    return -1;
}


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static virSecurityDriverStatus
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virSecurityDACProbe(const char *virtDriver ATTRIBUTE_UNUSED)
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{
    return SECURITY_DRIVER_ENABLE;
}

static int
virSecurityDACOpen(virSecurityManagerPtr mgr ATTRIBUTE_UNUSED)
{
    return 0;
}

static int
virSecurityDACClose(virSecurityManagerPtr mgr ATTRIBUTE_UNUSED)
{
    return 0;
}


static const char * virSecurityDACGetModel(virSecurityManagerPtr mgr ATTRIBUTE_UNUSED)
{
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    return SECURITY_DAC_NAME;
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}

static const char * virSecurityDACGetDOI(virSecurityManagerPtr mgr ATTRIBUTE_UNUSED)
{
    return "0";
}

static int
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virSecurityDACSetOwnership(const char *path, uid_t uid, gid_t gid)
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{
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    VIR_INFO("Setting DAC user and group on '%s' to '%ld:%ld'",
             path, (long) uid, (long) gid);
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    if (chown(path, uid, gid) < 0) {
        struct stat sb;
        int chown_errno = errno;

        if (stat(path, &sb) >= 0) {
            if (sb.st_uid == uid &&
                sb.st_gid == gid) {
                /* It's alright, there's nothing to change anyway. */
                return 0;
            }
        }

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        if (chown_errno == EOPNOTSUPP || chown_errno == EINVAL) {
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            VIR_INFO("Setting user and group to '%ld:%ld' on '%s' not "
                     "supported by filesystem",
                     (long) uid, (long) gid, path);
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        } else if (chown_errno == EPERM) {
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            VIR_INFO("Setting user and group to '%ld:%ld' on '%s' not "
                     "permitted",
                     (long) uid, (long) gid, path);
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        } else if (chown_errno == EROFS) {
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            VIR_INFO("Setting user and group to '%ld:%ld' on '%s' not "
                     "possible on readonly filesystem",
                     (long) uid, (long) gid, path);
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        } else {
            virReportSystemError(chown_errno,
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                                 _("unable to set user and group to '%ld:%ld' "
                                   "on '%s'"),
                                 (long) uid, (long) gid, path);
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            return -1;
        }
    }
    return 0;
}

static int
virSecurityDACRestoreSecurityFileLabel(const char *path)
{
    struct stat buf;
    int rc = -1;
    char *newpath = NULL;

    VIR_INFO("Restoring DAC user and group on '%s'", path);

    if (virFileResolveLink(path, &newpath) < 0) {
        virReportSystemError(errno,
                             _("cannot resolve symlink %s"), path);
        goto err;
    }

    if (stat(newpath, &buf) != 0)
        goto err;

    /* XXX record previous ownership */
    rc = virSecurityDACSetOwnership(newpath, 0, 0);

err:
    VIR_FREE(newpath);
    return rc;
}


static int
virSecurityDACSetSecurityFileLabel(virDomainDiskDefPtr disk ATTRIBUTE_UNUSED,
                                   const char *path,
                                   size_t depth ATTRIBUTE_UNUSED,
                                   void *opaque)
{
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    void **params = opaque;
    virSecurityManagerPtr mgr = params[0];
    virDomainDefPtr def = params[1];
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    virSecurityDACDataPtr priv = virSecurityManagerGetPrivateData(mgr);
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    uid_t user;
    gid_t group;

    if (virSecurityDACGetImageIds(def, priv, &user, &group))
        return -1;
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    return virSecurityDACSetOwnership(path, user, group);
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}


static int
virSecurityDACSetSecurityImageLabel(virSecurityManagerPtr mgr,
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                                    virDomainDefPtr def ATTRIBUTE_UNUSED,
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                                    virDomainDiskDefPtr disk)

{
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    uid_t user;
    gid_t group;
    void *params[2];
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    virSecurityDACDataPtr priv = virSecurityManagerGetPrivateData(mgr);

    if (!priv->dynamicOwnership)
        return 0;

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    if (disk->type == VIR_DOMAIN_DISK_TYPE_NETWORK)
        return 0;

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    if (virSecurityDACGetImageIds(def, priv, &user, &group))
        return -1;

    params[0] = mgr;
    params[1] = def;
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    return virDomainDiskDefForeachPath(disk,
                                       virSecurityManagerGetAllowDiskFormatProbing(mgr),
                                       false,
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                                       user, group,
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                                       virSecurityDACSetSecurityFileLabel,
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                                       params);
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}


static int
virSecurityDACRestoreSecurityImageLabelInt(virSecurityManagerPtr mgr,
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                                           virDomainDefPtr def ATTRIBUTE_UNUSED,
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                                           virDomainDiskDefPtr disk,
                                           int migrated)
{
    virSecurityDACDataPtr priv = virSecurityManagerGetPrivateData(mgr);

    if (!priv->dynamicOwnership)
        return 0;

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    if (disk->type == VIR_DOMAIN_DISK_TYPE_NETWORK)
        return 0;

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    /* 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 (disk->readonly || disk->shared)
        return 0;

    if (!disk->src)
        return 0;

    /* If we have a shared FS & doing migrated, 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 = virStorageFileIsSharedFS(disk->src);
        if (rc < 0)
            return -1;
        if (rc == 1) {
            VIR_DEBUG("Skipping image label restore on %s because FS is shared",
                      disk->src);
            return 0;
        }
    }

    return virSecurityDACRestoreSecurityFileLabel(disk->src);
}


static int
virSecurityDACRestoreSecurityImageLabel(virSecurityManagerPtr mgr,
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                                        virDomainDefPtr def,
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                                        virDomainDiskDefPtr disk)
{
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    return virSecurityDACRestoreSecurityImageLabelInt(mgr, def, disk, 0);
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}


static int
virSecurityDACSetSecurityPCILabel(pciDevice *dev ATTRIBUTE_UNUSED,
                                  const char *file,
                                  void *opaque)
{
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    void **params = opaque;
    virSecurityManagerPtr mgr = params[0];
    virDomainDefPtr def = params[1];
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    virSecurityDACDataPtr priv = virSecurityManagerGetPrivateData(mgr);
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    uid_t user;
    gid_t group;
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    if (virSecurityDACGetIds(def, priv, &user, &group))
        return -1;

    return virSecurityDACSetOwnership(file, user, group);
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}


static int
virSecurityDACSetSecurityUSBLabel(usbDevice *dev ATTRIBUTE_UNUSED,
                                  const char *file,
                                  void *opaque)
{
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    void **params = opaque;
    virSecurityManagerPtr mgr = params[0];
    virDomainDefPtr def = params[1];
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    virSecurityDACDataPtr priv = virSecurityManagerGetPrivateData(mgr);
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    uid_t user;
    gid_t group;
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    if (virSecurityDACGetIds(def, priv, &user, &group))
        return -1;

    return virSecurityDACSetOwnership(file, user, group);
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}


static int
virSecurityDACSetSecurityHostdevLabel(virSecurityManagerPtr mgr,
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                                      virDomainDefPtr def,
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                                      virDomainHostdevDefPtr dev)
{
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    void *params[] = {mgr, def};
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    virSecurityDACDataPtr priv = virSecurityManagerGetPrivateData(mgr);
    int ret = -1;

    if (!priv->dynamicOwnership)
        return 0;

    if (dev->mode != VIR_DOMAIN_HOSTDEV_MODE_SUBSYS)
        return 0;

    switch (dev->source.subsys.type) {
    case VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_USB: {
        usbDevice *usb = usbGetDevice(dev->source.subsys.u.usb.bus,
                                      dev->source.subsys.u.usb.device);

        if (!usb)
            goto done;

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        ret = usbDeviceFileIterate(usb, virSecurityDACSetSecurityUSBLabel,
                                   params);
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        usbFreeDevice(usb);
        break;
    }

    case VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_PCI: {
        pciDevice *pci = pciGetDevice(dev->source.subsys.u.pci.domain,
                                      dev->source.subsys.u.pci.bus,
                                      dev->source.subsys.u.pci.slot,
                                      dev->source.subsys.u.pci.function);

        if (!pci)
            goto done;

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        ret = pciDeviceFileIterate(pci, virSecurityDACSetSecurityPCILabel,
                                   params);
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        pciFreeDevice(pci);

        break;
    }

    default:
        ret = 0;
        break;
    }

done:
    return ret;
}


static int
virSecurityDACRestoreSecurityPCILabel(pciDevice *dev ATTRIBUTE_UNUSED,
                                      const char *file,
                                      void *opaque ATTRIBUTE_UNUSED)
{
    return virSecurityDACRestoreSecurityFileLabel(file);
}


static int
virSecurityDACRestoreSecurityUSBLabel(usbDevice *dev ATTRIBUTE_UNUSED,
                                       const char *file,
                                       void *opaque ATTRIBUTE_UNUSED)
{
    return virSecurityDACRestoreSecurityFileLabel(file);
}


static int
virSecurityDACRestoreSecurityHostdevLabel(virSecurityManagerPtr mgr,
514
                                           virDomainDefPtr def ATTRIBUTE_UNUSED,
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                                           virDomainHostdevDefPtr dev)

{
    virSecurityDACDataPtr priv = virSecurityManagerGetPrivateData(mgr);
    int ret = -1;

    if (!priv->dynamicOwnership)
        return 0;

    if (dev->mode != VIR_DOMAIN_HOSTDEV_MODE_SUBSYS)
        return 0;

    switch (dev->source.subsys.type) {
    case VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_USB: {
        usbDevice *usb = usbGetDevice(dev->source.subsys.u.usb.bus,
                                      dev->source.subsys.u.usb.device);

        if (!usb)
            goto done;

        ret = usbDeviceFileIterate(usb, virSecurityDACRestoreSecurityUSBLabel, mgr);
        usbFreeDevice(usb);

        break;
    }

    case VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_PCI: {
        pciDevice *pci = pciGetDevice(dev->source.subsys.u.pci.domain,
                                      dev->source.subsys.u.pci.bus,
                                      dev->source.subsys.u.pci.slot,
                                      dev->source.subsys.u.pci.function);

        if (!pci)
            goto done;

        ret = pciDeviceFileIterate(pci, virSecurityDACRestoreSecurityPCILabel, mgr);
        pciFreeDevice(pci);

        break;
    }

    default:
        ret = 0;
        break;
    }

done:
    return ret;
}


static int
virSecurityDACSetChardevLabel(virSecurityManagerPtr mgr,
568
                              virDomainDefPtr def,
569
                              virDomainChrSourceDefPtr dev)
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{
    virSecurityDACDataPtr priv = virSecurityManagerGetPrivateData(mgr);
    char *in = NULL, *out = NULL;
    int ret = -1;
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    uid_t user;
    gid_t group;

    if (virSecurityDACGetIds(def, priv, &user, &group))
        return -1;
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    switch (dev->type) {
    case VIR_DOMAIN_CHR_TYPE_DEV:
    case VIR_DOMAIN_CHR_TYPE_FILE:
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        ret = virSecurityDACSetOwnership(dev->data.file.path, user, group);
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        break;

    case VIR_DOMAIN_CHR_TYPE_PIPE:
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        if ((virAsprintf(&in, "%s.in", dev->data.file.path) < 0) ||
            (virAsprintf(&out, "%s.out", dev->data.file.path) < 0)) {
            virReportOOMError();
            goto done;
        }
        if (virFileExists(in) && virFileExists(out)) {
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            if ((virSecurityDACSetOwnership(in, user, group) < 0) ||
                (virSecurityDACSetOwnership(out, user, group) < 0)) {
596
                goto done;
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            }
        } else if (virSecurityDACSetOwnership(dev->data.file.path,
599
                                              user, group) < 0) {
600
            goto done;
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        }
        ret = 0;
        break;

    default:
        ret = 0;
        break;
    }

done:
    VIR_FREE(in);
    VIR_FREE(out);
    return ret;
}

static int
virSecurityDACRestoreChardevLabel(virSecurityManagerPtr mgr ATTRIBUTE_UNUSED,
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                                  virDomainChrSourceDefPtr dev)
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{
    char *in = NULL, *out = NULL;
    int ret = -1;

    switch (dev->type) {
    case VIR_DOMAIN_CHR_TYPE_DEV:
    case VIR_DOMAIN_CHR_TYPE_FILE:
        ret = virSecurityDACRestoreSecurityFileLabel(dev->data.file.path);
        break;

    case VIR_DOMAIN_CHR_TYPE_PIPE:
        if ((virAsprintf(&out, "%s.out", dev->data.file.path) < 0) ||
            (virAsprintf(&in, "%s.in", dev->data.file.path) < 0)) {
            virReportOOMError();
            goto done;
        }
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        if (virFileExists(in) && virFileExists(out)) {
            if ((virSecurityDACRestoreSecurityFileLabel(out) < 0) ||
                (virSecurityDACRestoreSecurityFileLabel(in) < 0)) {
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            goto done;
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            }
        } else if (virSecurityDACRestoreSecurityFileLabel(dev->data.file.path) < 0) {
            goto done;
        }
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        ret = 0;
        break;

    default:
        ret = 0;
        break;
    }

done:
    VIR_FREE(in);
    VIR_FREE(out);
    return ret;
}


static int
virSecurityDACRestoreChardevCallback(virDomainDefPtr def ATTRIBUTE_UNUSED,
                                     virDomainChrDefPtr dev,
                                     void *opaque)
{
    virSecurityManagerPtr mgr = opaque;

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    return virSecurityDACRestoreChardevLabel(mgr, &dev->source);
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}


static int
virSecurityDACRestoreSecurityAllLabel(virSecurityManagerPtr mgr,
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                                      virDomainDefPtr def,
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                                      int migrated)
{
    virSecurityDACDataPtr priv = virSecurityManagerGetPrivateData(mgr);
    int i;
    int rc = 0;

    if (!priv->dynamicOwnership)
        return 0;


    VIR_DEBUG("Restoring security label on %s migrated=%d",
683
              def->name, migrated);
684

685
    for (i = 0 ; i < def->nhostdevs ; i++) {
686
        if (virSecurityDACRestoreSecurityHostdevLabel(mgr,
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                                                      def,
                                                      def->hostdevs[i]) < 0)
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            rc = -1;
    }
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    for (i = 0 ; i < def->ndisks ; i++) {
692
        if (virSecurityDACRestoreSecurityImageLabelInt(mgr,
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                                                       def,
                                                       def->disks[i],
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                                                       migrated) < 0)
            rc = -1;
    }

699
    if (virDomainChrDefForeach(def,
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                               false,
                               virSecurityDACRestoreChardevCallback,
702
                               mgr) < 0)
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        rc = -1;

705 706
    if (def->os.kernel &&
        virSecurityDACRestoreSecurityFileLabel(def->os.kernel) < 0)
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        rc = -1;

709 710
    if (def->os.initrd &&
        virSecurityDACRestoreSecurityFileLabel(def->os.initrd) < 0)
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        rc = -1;

    return rc;
}


static int
virSecurityDACSetChardevCallback(virDomainDefPtr def ATTRIBUTE_UNUSED,
                                 virDomainChrDefPtr dev,
                                 void *opaque)
{
    virSecurityManagerPtr mgr = opaque;

724
    return virSecurityDACSetChardevLabel(mgr, def, &dev->source);
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}


static int
virSecurityDACSetSecurityAllLabel(virSecurityManagerPtr mgr,
730
                                  virDomainDefPtr def,
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                                  const char *stdin_path ATTRIBUTE_UNUSED)
{
    virSecurityDACDataPtr priv = virSecurityManagerGetPrivateData(mgr);
    int i;
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    uid_t user;
    gid_t group;
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    if (!priv->dynamicOwnership)
        return 0;

741
    for (i = 0 ; i < def->ndisks ; i++) {
742
        /* XXX fixme - we need to recursively label the entire tree :-( */
743
        if (def->disks[i]->type == VIR_DOMAIN_DISK_TYPE_DIR)
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            continue;
        if (virSecurityDACSetSecurityImageLabel(mgr,
746 747
                                                def,
                                                def->disks[i]) < 0)
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            return -1;
    }
750
    for (i = 0 ; i < def->nhostdevs ; i++) {
751
        if (virSecurityDACSetSecurityHostdevLabel(mgr,
752 753
                                                  def,
                                                  def->hostdevs[i]) < 0)
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            return -1;
    }

757
    if (virDomainChrDefForeach(def,
758 759
                               true,
                               virSecurityDACSetChardevCallback,
760
                               mgr) < 0)
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        return -1;

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    if (virSecurityDACGetImageIds(def, priv, &user, &group))
        return -1;

766
    if (def->os.kernel &&
767
        virSecurityDACSetOwnership(def->os.kernel, user, group) < 0)
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        return -1;

770
    if (def->os.initrd &&
771
        virSecurityDACSetOwnership(def->os.initrd, user, group) < 0)
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        return -1;

    return 0;
}


static int
virSecurityDACSetSavedStateLabel(virSecurityManagerPtr mgr,
780
                                 virDomainDefPtr def,
781 782
                                 const char *savefile)
{
783 784
    uid_t user;
    gid_t group;
785 786
    virSecurityDACDataPtr priv = virSecurityManagerGetPrivateData(mgr);

787 788 789 790
    if (virSecurityDACGetImageIds(def, priv, &user, &group))
        return -1;

    return virSecurityDACSetOwnership(savefile, user, group);
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}


static int
virSecurityDACRestoreSavedStateLabel(virSecurityManagerPtr mgr,
796
                                     virDomainDefPtr def ATTRIBUTE_UNUSED,
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                                     const char *savefile)
{
    virSecurityDACDataPtr priv = virSecurityManagerGetPrivateData(mgr);

    if (!priv->dynamicOwnership)
        return 0;

    return virSecurityDACRestoreSecurityFileLabel(savefile);
}


static int
virSecurityDACSetProcessLabel(virSecurityManagerPtr mgr,
810
                              virDomainDefPtr def ATTRIBUTE_UNUSED)
811
{
812 813
    uid_t user;
    gid_t group;
814 815
    virSecurityDACDataPtr priv = virSecurityManagerGetPrivateData(mgr);

816 817 818 819
    if (virSecurityDACGetIds(def, priv, &user, &group))
        return -1;

    VIR_DEBUG("Dropping privileges of DEF to %u:%u", user, group);
820

821
    if (virSetUIDGID(user, group) < 0)
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        return -1;

    return 0;
}


static int
virSecurityDACVerify(virSecurityManagerPtr mgr ATTRIBUTE_UNUSED,
                     virDomainDefPtr def ATTRIBUTE_UNUSED)
{
    return 0;
}

static int
836 837
virSecurityDACGenLabel(virSecurityManagerPtr mgr,
                       virDomainDefPtr def)
838
{
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    int rc = -1;
    virSecurityLabelDefPtr seclabel;
    virSecurityDACDataPtr priv = virSecurityManagerGetPrivateData(mgr);

    if (mgr == NULL) {
        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
                       _("invalid security driver"));
        return rc;
    }

    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(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, "%d:%d", priv->user, priv->group) < 0) {
            virReportOOMError();
            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 */
        break;
    default:
        virReportError(VIR_ERR_INTERNAL_ERROR,
                       _("unexpected security label type '%s'"),
                       virDomainSeclabelTypeToString(seclabel->type));
        return rc;
    }

    if (!seclabel->norelabel) {
        if (seclabel->imagelabel == NULL) {
            seclabel->imagelabel = strdup(seclabel->label);
            if (seclabel->imagelabel == NULL) {
                virReportError(VIR_ERR_INTERNAL_ERROR,
                               _("cannot generate dac user and group id "
                                 "for domain %s"), def->name);
                VIR_FREE(seclabel->label);
                seclabel->label = NULL;
                return rc;
            }
        }
    }

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    return 0;
}

static int
virSecurityDACReleaseLabel(virSecurityManagerPtr mgr ATTRIBUTE_UNUSED,
920
                           virDomainDefPtr def ATTRIBUTE_UNUSED)
921 922 923 924 925 926
{
    return 0;
}

static int
virSecurityDACReserveLabel(virSecurityManagerPtr mgr ATTRIBUTE_UNUSED,
927 928
                           virDomainDefPtr def ATTRIBUTE_UNUSED,
                           pid_t pid ATTRIBUTE_UNUSED)
929 930 931 932 933 934
{
    return 0;
}

static int
virSecurityDACGetProcessLabel(virSecurityManagerPtr mgr ATTRIBUTE_UNUSED,
935 936
                              virDomainDefPtr def ATTRIBUTE_UNUSED,
                              pid_t pid ATTRIBUTE_UNUSED,
937 938
                              virSecurityLabelPtr seclabel ATTRIBUTE_UNUSED)
{
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    virSecurityLabelDefPtr secdef =
        virDomainDefGetSecurityLabelDef(def, SECURITY_DAC_NAME);

    if (!secdef || !seclabel)
        return -1;

    if (secdef->label)
        strcpy(seclabel->label, secdef->label);

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    return 0;
}

static int
952
virSecurityDACSetDaemonSocketLabel(virSecurityManagerPtr mgr ATTRIBUTE_UNUSED,
953
                                   virDomainDefPtr vm ATTRIBUTE_UNUSED)
954 955 956 957 958
{
    return 0;
}


959 960
static int
virSecurityDACSetSocketLabel(virSecurityManagerPtr mgr ATTRIBUTE_UNUSED,
961
                             virDomainDefPtr def ATTRIBUTE_UNUSED)
962 963 964 965 966
{
    return 0;
}


967 968
static int
virSecurityDACClearSocketLabel(virSecurityManagerPtr mgr ATTRIBUTE_UNUSED,
969
                               virDomainDefPtr def ATTRIBUTE_UNUSED)
970 971 972 973
{
    return 0;
}

974
static int
975
virSecurityDACSetImageFDLabel(virSecurityManagerPtr mgr ATTRIBUTE_UNUSED,
976
                              virDomainDefPtr def ATTRIBUTE_UNUSED,
977
                              int fd ATTRIBUTE_UNUSED)
978 979 980 981
{
    return 0;
}

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static char *virSecurityDACGetMountOptions(virSecurityManagerPtr mgr ATTRIBUTE_UNUSED,
                                           virDomainDefPtr vm ATTRIBUTE_UNUSED) {
    return NULL;
}

987
virSecurityDriver virSecurityDriverDAC = {
988
    .privateDataLen                     = sizeof(virSecurityDACData),
989
    .name                               = SECURITY_DAC_NAME,
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    .probe                              = virSecurityDACProbe,
    .open                               = virSecurityDACOpen,
    .close                              = virSecurityDACClose,
993

994 995
    .getModel                           = virSecurityDACGetModel,
    .getDOI                             = virSecurityDACGetDOI,
996

997
    .domainSecurityVerify               = virSecurityDACVerify,
998

999 1000
    .domainSetSecurityImageLabel        = virSecurityDACSetSecurityImageLabel,
    .domainRestoreSecurityImageLabel    = virSecurityDACRestoreSecurityImageLabel,
1001

1002 1003 1004
    .domainSetSecurityDaemonSocketLabel = virSecurityDACSetDaemonSocketLabel,
    .domainSetSecuritySocketLabel       = virSecurityDACSetSocketLabel,
    .domainClearSecuritySocketLabel     = virSecurityDACClearSocketLabel,
1005

1006 1007 1008
    .domainGenSecurityLabel             = virSecurityDACGenLabel,
    .domainReserveSecurityLabel         = virSecurityDACReserveLabel,
    .domainReleaseSecurityLabel         = virSecurityDACReleaseLabel,
1009

1010 1011
    .domainGetSecurityProcessLabel      = virSecurityDACGetProcessLabel,
    .domainSetSecurityProcessLabel      = virSecurityDACSetProcessLabel,
1012

1013 1014
    .domainSetSecurityAllLabel          = virSecurityDACSetSecurityAllLabel,
    .domainRestoreSecurityAllLabel      = virSecurityDACRestoreSecurityAllLabel,
1015

1016 1017
    .domainSetSecurityHostdevLabel      = virSecurityDACSetSecurityHostdevLabel,
    .domainRestoreSecurityHostdevLabel  = virSecurityDACRestoreSecurityHostdevLabel,
1018

1019 1020
    .domainSetSavedStateLabel           = virSecurityDACSetSavedStateLabel,
    .domainRestoreSavedStateLabel       = virSecurityDACRestoreSavedStateLabel,
1021

1022
    .domainSetSecurityImageFDLabel      = virSecurityDACSetImageFDLabel,
1023

1024
    .domainGetSecurityMountOptions      = virSecurityDACGetMountOptions,
1025
};