Example #1
0
func userInGroup(u *user.User, g *Group) (bool, error) {
	if u.Gid == g.Gid {
		return true, nil
	}
	gid, err := strconv.Atoi(g.Gid)
	if err != nil {
		return false, err
	}

	nameC := C.CString(u.Username)
	defer C.free(unsafe.Pointer(nameC))
	groupC := C.gid_t(gid)
	ngroupsC := C.int(0)

	C.mygetgrouplist(nameC, groupC, nil, &ngroupsC)
	ngroups := int(ngroupsC)

	groups := C.malloc(C.size_t(int(unsafe.Sizeof(groupC)) * ngroups))
	defer C.free(groups)

	rv := C.mygetgrouplist(nameC, groupC, (*C.gid_t)(groups), &ngroupsC)
	if rv == -1 {
		return false, fmt.Errorf("user: membership of %s in %s: %s", u.Username, g.Name, syscall.Errno(rv))
	}

	ngroups = int(ngroupsC)
	for i := 0; i < ngroups; i++ {
		gid := C.group_at(C.int(i), (*C.gid_t)(groups))
		if g.Gid == strconv.Itoa(int(gid)) {
			return true, nil
		}
	}
	return false, nil
}
Example #2
0
func GetGroupList(u *user.User) ([]string, error) {
	var members []string
	gid, err := strconv.Atoi(u.Gid)
	if err != nil {
		return nil, err
	}

	nameC := C.CString(u.Username)
	defer C.free(unsafe.Pointer(nameC))
	groupC := C.gid_t(gid)
	ngroupsC := C.int(0)

	C.mygetgrouplist(nameC, groupC, nil, &ngroupsC)
	ngroups := int(ngroupsC)

	groups := C.malloc(C.size_t(int(unsafe.Sizeof(groupC)) * ngroups))
	defer C.free(groups)

	rv := C.mygetgrouplist(nameC, groupC, (*C.gid_t)(groups), &ngroupsC)
	if rv == -1 {
		return nil, fmt.Errorf("user: membership of %s in %s: %s", u.Username, u.Gid, syscall.Errno(rv))
	}

	ngroups = int(ngroupsC)
	for i := 0; i < ngroups; i++ {
		gid := C.group_at(C.int(i), (*C.gid_t)(groups))
		gidS := strconv.Itoa(int(gid))
		group, err := LookupGroupID(gidS)
		if err != nil {
			return nil, err
		}
		members = append(members, group.Name)
	}
	return members, nil
}
Example #3
0
func listGroups(u *User) ([]string, error) {
	ug, err := strconv.Atoi(u.Gid)
	if err != nil {
		return nil, fmt.Errorf("user: list groups for %s: invalid gid %q", u.Username, u.Gid)
	}
	userGID := C.gid_t(ug)
	nameC := C.CString(u.Username)
	defer C.free(unsafe.Pointer(nameC))

	n := C.int(256)
	gidsC := make([]C.gid_t, n)
	rv := C.mygetgrouplist(nameC, userGID, &gidsC[0], &n)
	if rv == -1 {
		// More than initial buffer, but now n contains the correct size.
		const maxGroups = 2048
		if n > maxGroups {
			return nil, fmt.Errorf("user: list groups for %s: member of more than %d groups", u.Username, maxGroups)
		}
		gidsC = make([]C.gid_t, n)
		rv := C.mygetgrouplist(nameC, userGID, &gidsC[0], &n)
		if rv == -1 {
			return nil, fmt.Errorf("user: list groups for %s failed (changed groups?)", u.Username)
		}
	}
	gidsC = gidsC[:n]
	gids := make([]string, 0, n)
	for _, g := range gidsC[:n] {
		gids = append(gids, strconv.Itoa(int(g)))
	}
	return gids, nil
}
Example #4
0
func getGroupList(name *C.char, userGID C.gid_t, gids *C.gid_t, n *C.int) C.int {
	return C.mygetgrouplist(name, userGID, gids, n)
}