C++ crgetuid函数代码示例

/*
 * Decide whether it is okay to remove within a sticky directory.
 *
 * In sticky directories, write access is not sufficient;
 * you can remove entries from a directory only if:
 *
 *	you own the directory,
 *	you own the entry,
 *	the entry is a plain file and you have write access,
 *	or you are privileged (checked in secpolicy...).
 *
 * The function returns 0 if remove access is granted.
 */
int
zfs_sticky_remove_access(znode_t *zdp, znode_t *zp, cred_t *cr)
{
	uid_t		uid;
	uid_t		downer;
	uid_t		fowner;
	zfsvfs_t	*zfsvfs = ZTOZSB(zdp);

	if (zfsvfs->z_replay)
		return (0);

	if ((zdp->z_mode & S_ISVTX) == 0)
		return (0);

	downer = zfs_fuid_map_id(zfsvfs, KUID_TO_SUID(ZTOI(zdp)->i_uid),
	    cr, ZFS_OWNER);
	fowner = zfs_fuid_map_id(zfsvfs, KUID_TO_SUID(ZTOI(zp)->i_uid),
	    cr, ZFS_OWNER);

	if ((uid = crgetuid(cr)) == downer || uid == fowner ||
	    (S_ISDIR(ZTOI(zp)->i_mode) &&
	    zfs_zaccess(zp, ACE_WRITE_DATA, 0, B_FALSE, cr) == 0))
		return (0);
	else
		return (secpolicy_vnode_remove(cr));
}

uid_t
zfs_fuid_map_id(zfsvfs_t *zfsvfs, uint64_t fuid,
    cred_t *cr, zfs_fuid_type_t type)
{
#ifdef HAVE_ZPL
	uint32_t index = FUID_INDEX(fuid);
	const char *domain;
	uid_t id;

	if (index == 0)
		return (fuid);

	domain = zfs_fuid_find_by_idx(zfsvfs, index);
	ASSERT(domain != NULL);

	if (type == ZFS_OWNER || type == ZFS_ACE_USER) {
		(void) kidmap_getuidbysid(crgetzone(cr), domain,
		    FUID_RID(fuid), &id);
	} else {
		(void) kidmap_getgidbysid(crgetzone(cr), domain,
		    FUID_RID(fuid), &id);
	}
	return (id);
#endif
	if(type == ZFS_OWNER || type == ZFS_ACE_USER)
		return (crgetuid(cr));
	else
		return (crgetgid(cr));

}

/*
 * Decide whether it is okay to remove within a sticky directory.
 *
 * In sticky directories, write access is not sufficient;
 * you can remove entries from a directory only if:
 *
 *	you own the directory,
 *	you own the entry,
 *	the entry is a plain file and you have write access,
 *	or you are privileged (checked in secpolicy...).
 *
 * The function returns 0 if remove access is granted.
 */
int
zfs_sticky_remove_access(znode_t *zdp, znode_t *zp, cred_t *cr)
{
#ifdef HAVE_ZPL
	uid_t  		uid;
	uid_t		downer;
	uid_t		fowner;
	zfsvfs_t	*zfsvfs = zdp->z_zfsvfs;

	if (zdp->z_zfsvfs->z_replay)
		return (0);

	if ((zdp->z_mode & S_ISVTX) == 0)
		return (0);

	downer = zfs_fuid_map_id(zfsvfs, zdp->z_uid, cr, ZFS_OWNER);
	fowner = zfs_fuid_map_id(zfsvfs, zp->z_uid, cr, ZFS_OWNER);

	if ((uid = crgetuid(cr)) == downer || uid == fowner ||
	    (ZTOV(zp)->v_type == VREG &&
	    zfs_zaccess(zp, ACE_WRITE_DATA, 0, B_FALSE, cr) == 0))
		return (0);
	else
		return (secpolicy_vnode_remove(cr));
#endif 
	return 0;
}

/*
 * XDR loopback unix auth parameters.
 * NOTE: this is an XDR_ENCODE only routine.
 */
bool_t
xdr_authloopback(XDR *xdrs)
{
	uid_t uid;
	gid_t gid;
	int len;
	caddr_t groups;
	char *name = uts_nodename();
	struct cred *cr;
	time_t now;

	if (xdrs->x_op != XDR_ENCODE)
		return (FALSE);

	cr = CRED();
	uid = crgetuid(cr);
	gid = crgetgid(cr);
	len = crgetngroups(cr);
	groups = (caddr_t)crgetgroups(cr);
	now = gethrestime_sec();
	if (xdr_uint32(xdrs, (uint32_t *)&now) &&
	    xdr_string(xdrs, &name, MAX_MACHINE_NAME) &&
	    xdr_uid_t(xdrs, &uid) &&
	    xdr_gid_t(xdrs, &gid) &&
	    xdr_array(xdrs, &groups, (uint_t *)&len, NGRPS_LOOPBACK,
	    sizeof (int), (xdrproc_t)xdr_int))
		return (TRUE);
	return (FALSE);
}

/*
 * Write out a history event.
 */
int
spa_history_log(spa_t *spa, const char *history_str, history_log_type_t what)
{
	history_arg_t *ha;
	int err = 0;
	dmu_tx_t *tx;

	ASSERT(what != LOG_INTERNAL);

	tx = dmu_tx_create_dd(spa_get_dsl(spa)->dp_mos_dir);
	err = dmu_tx_assign(tx, TXG_WAIT);
	if (err) {
		dmu_tx_abort(tx);
		return (err);
	}

	ha = kmem_alloc(sizeof (history_arg_t), KM_SLEEP);
	ha->ha_history_str = strdup(history_str);
	ha->ha_zone = strdup(spa_history_zone());
	ha->ha_log_type = what;
	ha->ha_uid = crgetuid(CRED());

	/* Kick this off asynchronously; errors are ignored. */
	dsl_sync_task_do_nowait(spa_get_dsl(spa), NULL,
	    spa_history_log_sync, spa, ha, 0, tx);
	dmu_tx_commit(tx);

	/* spa_history_log_sync will free ha and strings */
	return (err);
}

static int
VMBlockOpen(struct vnode **vpp,    // IN: Vnode for file to open
            int flag,              // IN: Open flags
            struct cred *cr        // IN: Credentials of caller
#if OS_VFS_VERSION >= 5
          , caller_context_t *ctx  // IN: Caller's context
#endif
           )
{
   VMBlockMountInfo *mip;
   Bool isRoot = TRUE;

   Debug(VMBLOCK_ENTRY_LOGLEVEL, "VMBlockOpen: entry\n");

   /*
    * The opened vnode is held for us, so we don't need to do anything here
    * except make sure only root opens the mount point.
    */
   mip = VPTOMIP(*vpp);
   if (mip->root == *vpp) {
      isRoot = crgetuid(cr) == 0;
   }

   return isRoot ? 0 : EACCES;
}

/*
 * Create a file system FUID, based on information in the users cred
 */
uint64_t
zfs_fuid_create_cred(zfsvfs_t *zfsvfs, zfs_fuid_type_t type,
    dmu_tx_t *tx, cred_t *cr, zfs_fuid_info_t **fuidp)
{
	uint64_t	idx;
	ksid_t		*ksid;
	uint32_t	rid;
	char 		*kdomain;
	const char	*domain;
	uid_t		id;

	VERIFY(type == ZFS_OWNER || type == ZFS_GROUP);

	if (type == ZFS_OWNER)
		id = crgetuid(cr);
	else
		id = crgetgid(cr);

	if (!zfsvfs->z_use_fuids || !IS_EPHEMERAL(id))
		return ((uint64_t)id);

	ksid = crgetsid(cr, (type == ZFS_OWNER) ? KSID_OWNER : KSID_GROUP);

	VERIFY(ksid != NULL);
	rid = ksid_getrid(ksid);
	domain = ksid_getdomain(ksid);

	idx = zfs_fuid_find_by_domain(zfsvfs, domain, &kdomain, tx);

	zfs_fuid_node_add(fuidp, kdomain, rid, idx, id, type);

	return (FUID_ENCODE(idx, rid));
}

static int
splat_cred_test1(struct file *file, void *arg)
{
	char str[GROUP_STR_SIZE];
	uid_t uid, ruid, suid;
	gid_t gid, rgid, sgid, *groups;
	int ngroups, i, count = 0;

	uid  = crgetuid(CRED());
	ruid = crgetruid(CRED());
	suid = crgetsuid(CRED());

	gid  = crgetgid(CRED());
	rgid = crgetrgid(CRED());
	sgid = crgetsgid(CRED());

	crhold(CRED());
	ngroups = crgetngroups(CRED());
	groups  = crgetgroups(CRED());

	memset(str, 0, GROUP_STR_SIZE);
	for (i = 0; i < ngroups; i++) {
		count += sprintf(str + count, "%d ", groups[i]);

		if (count > (GROUP_STR_SIZE - GROUP_STR_REDZONE)) {
			splat_vprint(file, SPLAT_CRED_TEST1_NAME,
				     "Failed too many group entries for temp "
				     "buffer: %d, %s\n", ngroups, str);
			return -ENOSPC;
		}
	}

	crfree(CRED());

	splat_vprint(file, SPLAT_CRED_TEST1_NAME,
		     "uid: %d ruid: %d suid: %d "
		     "gid: %d rgid: %d sgid: %d\n",
		     uid, ruid, suid, gid, rgid, sgid);
	splat_vprint(file, SPLAT_CRED_TEST1_NAME,
		     "ngroups: %d groups: %s\n", ngroups, str);

	if (uid || ruid || suid || gid || rgid || sgid) {
		splat_vprint(file, SPLAT_CRED_TEST1_NAME,
			     "Failed expected all uids+gids to be %d\n", 0);
		return -EIDRM;
	}

	if (ngroups > NGROUPS_MAX) {
		splat_vprint(file, SPLAT_CRED_TEST1_NAME,
			     "Failed ngroups must not exceed NGROUPS_MAX: "
			     "%d > %d\n", ngroups, NGROUPS_MAX);
		return -EIDRM;
	}

	splat_vprint(file, SPLAT_CRED_TEST1_NAME,
		     "Success sane CRED(): %d\n", 0);

        return 0;
} /* splat_cred_test1() */

int
zfs_make_xattrdir(znode_t *zp, vattr_t *vap, vnode_t **xvpp, cred_t *cr)
{
	zfsvfs_t *zfsvfs = zp->z_zfsvfs;
	znode_t *xzp;
	dmu_tx_t *tx;
	int error;
	zfs_fuid_info_t *fuidp = NULL;

	*xvpp = NULL;

	/*
	 * In FreeBSD, access checking for creating an EA is being done
	 * in zfs_setextattr(),
	 */
#ifndef __FreeBSD__
	if (error = zfs_zaccess(zp, ACE_WRITE_NAMED_ATTRS, 0, B_FALSE, cr))
		return (error);
#endif

	tx = dmu_tx_create(zfsvfs->z_os);
	dmu_tx_hold_bonus(tx, zp->z_id);
	dmu_tx_hold_zap(tx, DMU_NEW_OBJECT, FALSE, NULL);
	if (IS_EPHEMERAL(crgetuid(cr)) || IS_EPHEMERAL(crgetgid(cr))) {
		if (zfsvfs->z_fuid_obj == 0) {
			dmu_tx_hold_bonus(tx, DMU_NEW_OBJECT);
			dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0,
			    FUID_SIZE_ESTIMATE(zfsvfs));
			dmu_tx_hold_zap(tx, MASTER_NODE_OBJ, FALSE, NULL);
		} else {
			dmu_tx_hold_bonus(tx, zfsvfs->z_fuid_obj);
			dmu_tx_hold_write(tx, zfsvfs->z_fuid_obj, 0,
			    FUID_SIZE_ESTIMATE(zfsvfs));
		}
	}
	error = dmu_tx_assign(tx, zfsvfs->z_assign);
	if (error) {
		if (error == ERESTART && zfsvfs->z_assign == TXG_NOWAIT)
			dmu_tx_wait(tx);
		dmu_tx_abort(tx);
		return (error);
	}
	zfs_mknode(zp, vap, tx, cr, IS_XATTR, &xzp, 0, NULL, &fuidp);
	ASSERT(xzp->z_phys->zp_parent == zp->z_id);
	dmu_buf_will_dirty(zp->z_dbuf, tx);
	zp->z_phys->zp_xattr = xzp->z_id;

	(void) zfs_log_create(zfsvfs->z_log, tx, TX_MKXATTR, zp,
	    xzp, "", NULL, fuidp, vap);
	if (fuidp)
		zfs_fuid_info_free(fuidp);
	dmu_tx_commit(tx);

	*xvpp = ZTOV(xzp);

	return (0);
}

static void
smb_tree_set_execsub_info(smb_tree_t *tree, smb_execsub_info_t *subs)
{
		subs->e_winname = tree->t_user->u_name;
		subs->e_userdom = tree->t_user->u_domain;
		subs->e_srv_ipaddr = tree->t_session->local_ipaddr;
		subs->e_cli_ipaddr = tree->t_session->ipaddr;
		subs->e_cli_netbiosname = tree->t_session->workstation;
		subs->e_uid = crgetuid(tree->t_user->u_cred);
}

int				/* ERRNO if error, 0 if successful. */
sam_access_ino(
	sam_node_t *ip,		/* pointer to inode. */
	int mode,		/* mode of access to be verified */
	boolean_t locked,	/* is ip->inode_rwl held by caller? */
	cred_t *credp)		/* credentials pointer. */
{
	int shift = 0;

	ASSERT(!locked || RW_LOCK_HELD(&ip->inode_rwl));

	/*
	 * If requesting write access, and read only filesystem or WORM file
	 * return error.
	 */
	if (mode & S_IWRITE) {
		if (ip->mp->mt.fi_mflag & MS_RDONLY) {
			return (EROFS);
		}
		if (ip->di.status.b.worm_rdonly && !S_ISDIR(ip->di.mode)) {
			return (EROFS);
		}
	}

	if (!locked) {
		RW_LOCK_OS(&ip->inode_rwl, RW_READER);
	}

	/* Use ACL, if present, to check access. */
	if (ip->di.status.b.acl) {
		int error;

		error = sam_acl_access(ip, mode, credp);
		if (!locked) {
			RW_UNLOCK_OS(&ip->inode_rwl, RW_READER);
		}
		return (error);
	}

	if (!locked) {
		RW_UNLOCK_OS(&ip->inode_rwl, RW_READER);
	}

	if (crgetuid(credp) != ip->di.uid) {
		shift += 3;
		if (!groupmember((uid_t)ip->di.gid, credp)) {
			shift += 3;
		}
	}
	mode &= ~(ip->di.mode << shift);
	if (mode == 0) {
		return (0);
	}
	return (secpolicy_vnode_access(credp, SAM_ITOV(ip), ip->di.uid, mode));
}

/*
 * find_ids(packet, mp)
 *
 * attempt to discern the uid and projid of the originator of a packet by
 * looking at the dblks making up the packet - yeuch!
 *
 * We do it by skipping any fragments with a credp of NULL (originated in
 * kernel), taking the first value that isn't NULL to be the credp for the
 * whole packet. We also suck the projid from the same fragment.
 */
static void
find_ids(ipgpc_packet_t *packet, mblk_t *mp)
{
	cred_t *cr;

	cr = msg_getcred(mp, NULL);
	if (cr != NULL) {
		packet->uid = crgetuid(cr);
		packet->projid = crgetprojid(cr);
	} else {
		packet->uid = (uid_t)-1;
		packet->projid = -1;
	}
}

int
tmp_sticky_remove_access(struct tmpnode *dir, struct tmpnode *entry,
	struct cred *cr)
{
	uid_t uid = crgetuid(cr);

	if ((dir->tn_mode & S_ISVTX) &&
	    uid != dir->tn_uid &&
	    uid != entry->tn_uid &&
	    (entry->tn_type != VREG ||
	    tmp_taccess(entry, VWRITE, cr) != 0))
		return (secpolicy_vnode_remove(cr));

	return (0);
}

/*ARGSUSED*/
static int
bootfs_access(vnode_t *vp, int mode, int flags, cred_t *cr,
    caller_context_t *ct)
{
	int shift = 0;
	bootfs_node_t *bpn = (bootfs_node_t *)vp->v_data;

	if (crgetuid(cr) != bpn->bvn_attr.va_uid) {
		shift += 3;
		if (groupmember(bpn->bvn_attr.va_gid, cr) == 0)
			shift += 3;
	}

	return (secpolicy_vnode_access2(cr, vp, bpn->bvn_attr.va_uid,
	    bpn->bvn_attr.va_mode << shift, mode));
}

/*
 * Standard access() like check.  Figure out which mode bits apply
 * to the caller then pass the missing mode bits to the secpolicy function.
 */
static int
nm_access_unlocked(void *vnp, int mode, cred_t *crp)
{
	struct namenode *nodep = vnp;
	int shift = 0;

	if (crgetuid(crp) != nodep->nm_vattr.va_uid) {
		shift += 3;
		if (!groupmember(nodep->nm_vattr.va_gid, crp))
			shift += 3;
	}

	return (secpolicy_vnode_access2(crp, NMTOV(nodep),
	    nodep->nm_vattr.va_uid, nodep->nm_vattr.va_mode << shift,
	    mode));
}