Участник:Petr-akhlamov/Test

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Тестирование и диагностика Samba и ActiveDirectory

Проверка устойчивости имени хоста (Check hostname persistance)

Проверка имени хоста в FQDN [не короткое] (Test hostname is FQDN [not short])

FQDN (от англ. Fully Qualified Domain Name — «полностью определённое имя домена», иногда сокращается до «полное имя домена») — имя домена, не имеющее неоднозначностей в определении.

Метод аутентификации системы (System authentication method)

Включение аутентификации доменной системы (Domain system authentication enabled)

$runcmd check_system_policy "System policy method"

$runcmd test_gpupdate_system_policy "System group policy enabled"

$runcmd check_krb5_conf_exists "Check Kerberos configuration exists"

$runcmd check_krb5_conf_ccache "Kerberos credential cache status"

$runcmd test_keyring_krb5_conf_ccache "Using keyring as kerberos credential cache"

$runcmd check_krb5_conf_kdc_lookup "Check DNS lookup kerberos KDC status"

$runcmd check_krb5_keytab_exists "Check machine crendetial cache is exists"

$runcmd check_keytab_credential_list "Check machine credentials list in keytab"

$runcmd check_resolv_conf "Check nameserver resolver configuration"

$runcmd compare_resolv_conf_with_default_realm "Compare krb5 realm and first search domain"

$runcmd check_smb_conf "Check Samba configuration"

$runcmd compare_smb_realm_with_krb5_default_realm "Compare samba and krb5 realms"

$runcmd test_smb_realm "Check Samba domain realm"

$runcmd test_domainname "Check hostname FQDN domainname"

$runcmd check_time_synchronization "Check time synchronization"

$runcmd test_time_synchronization "Time synchronization enabled"

$runcmd check_nameservers "Check nameservers availability"

$runcmd check_domain_controllers "Check domain controllers list"

$runcmd check_kerberos_and_ldap_srv_records "Check Kerberos and LDAP SRV-records"

$runcmd compare_netbios_name "Compare NetBIOS name and hostname"

$runcmd check_common_packages "Check common packages"

$runcmd check_group_policy_packages "Check group policy packages"

$runcmd check_sssd_ad_packages "Check SSSD AD packages"

$runcmd check_sssd_winbind_packages "Check SSSD Winbind packages"

!/bin/bash

set -euo pipefail
. shell-terminfo
. shell-getopt
terminfo_init
PROG="domain-diag"
VERSION=0.2.2
verbose=
listcmd=
runcmd=run
logfile=/dev/null
force=
show_usage()
{

   echo "Active Directory domain environment diagnostic tool"
   echo ""
   echo "Usage: $PROG [options] [<check/test-function-name>]"
   echo ""
   echo "<check/test-function-name> must be a function name from the list of tests"
   echo ""
   echo "Options:"
   echo "  -h, --help			This message"
   echo "  -V, --version			Display version number"
   echo "  -v, --verbose			Verbose output"
   echo "  -w, --logfile[=FILE]		Write verbose output to file"
   echo "  -f, --force			Force logging to existing file"
   echo "  -l, --list			List of tests"
   echo ""
   exit 0;

}
print_version()
{

   echo "$VERSION"
   exit 0;

}
TEMP=$(getopt -n "$PROG" -o "v,V,w::,f,l,h" -l "verbose,version,logfile::,force,list,help" -- "$@") || show_usage
eval set -- "$TEMP"
while :; do

   case "$1" in
       -h|--help) show_usage
           ;;
       -v|--verbose) verbose=1
           ;;
       -w|--logfile) shift
            test -n "$1" && logfile="$1" || logfile="domain-diag.log"
           ;;
       -f|--force) force=1
           ;;
       -l|--list) listcmd=1
           ;;
       -V|--version) print_version "$PROG"
           ;;
       --) shift; break
           ;;
       *) fatal "Unrecognized option: $1"
           ;;
   esac
   shift

done
customcmd="$*"
msg_non_root()
{

   echo -n "$*: ["
   color_text "SKIP" blue
   echo "]"

}
msg_fail()
{

   echo -n "$*: ["
   color_text "FAIL" red
   echo "]"

}
msg_warn()
{

   echo -n "$*: ["
   color_text "WARN" yellow
   echo "]"

}
msg_done()
{

   echo -n "$*: ["
   color_text "DONE" green
   echo "]"

}
__command_msg()
{

   local p='$'
   if test "$1" = '-r'; then
       shift
       p='#'
   fi
   color_message "$p $*" bold

}
_command()
{

   local retval=0
   local x=
   local q=
   local r=
   if test "$1" = '-q'; then
       shift
       q=1
   fi
   if test "$1" = '-r'; then
       shift
       r=1
   fi
   if test "$1" = '-x'; then
       shift
       x=1
   fi
   test -z "$q" && test -z "$r" && __command_msg "$*"
   test -z "$q" && test -n "$r" && __command_msg -r "$*"
   test -z "$x" || echo ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   eval "$*" || retval=$?
   test -z "$x" || echo ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   echo
   return $retval

}
__header()
{

   color_message "===============================================================================" bold white

}
__footer()
{

   color_message "===============================================================================" bold white

}
__short_msg()
{

   case "$1" in
       0) msg_done  "$2" ;;
       2) msg_warn  "$2" ;;
       102) msg_non_root  "$2" ;;
       *) msg_fail "$2" ;;
   esac

}
__delimiter()
{

   echo "-------------------------------------------------------------------------------"

}
__check_title()
{

   color_message "$1" bold white

}
__newline()
{

   echo

}
__log()
{

   test -z $verbose && tee -a "$logfile" 1>/dev/null 2>&1 ||
       tee -a "$logfile"

}
__log_force_print()
{

   tee -a "$logfile"

}
print_head()
{

   __header | __log
   __check_title "| Samba environment diagnostic tool |" | __log
   __delimiter | __log
   echo "Version: $VERSION" | __log
   echo "Date: $(date)" | __log
   __delimiter | __log
   echo "System information" | __log
   echo "Kernel: $(uname -r)" | __log
   echo "Branch: $(apt-repo list | cut -d ' ' -f 2 | grep -e '^\[.*\]$' | tail -1 | sed -E 's/\[(.*)\]/\1/')" | __log
   __footer | __log
   __newline | __log

}
is_root()
{

   if test "$(id -u)" != 0; then
       return 1
   fi
   return 0

}
__not_root_skip()
{

   local msg=
   if test -n "${1+x}" && test "$1" = "-m"; then
       shift
       msg="$1"
   fi
   echo -n "Running not by root, SKIP: $msg"
   echo
   echo

}
run()
{

   local retval=126
   local func="$1"
   local msg
   msg=$(printf "| %s |" "$func")

   __header | __log

   __check_title "$msg" | __log
   __delimiter | __log
   __newline | __log

   $func 2>&1 | __log && retval=0 || retval=$?

   __delimiter | __log

   __short_msg $retval "$2" | __log_force_print

   __footer | __log
   __newline | __log

}
check_hostnamectl()
{

   local retval=0
   local static_host=
   local transient_host=
   transient_host="$(hostname)" || retval=1
   static_host="$(hostnamectl --static)" || retval=1
   _command hostnamectl || retval=1
   test "$static_host" = "$transient_host" || retval=1
   return $retval

}
test_hostname()
{

   local host="$HOSTNAME_COMMON"
   echo $host
   echo
   test "$host" != "${host/.}" || return 2

}
check_system_auth()
{

   local auth=
   auth=$(/usr/sbin/control system-auth)
   _command /usr/sbin/control system-auth
   _command readlink -f /etc/pam.d/system-auth
   _command -x cat /etc/pam.d/system-auth
   test -n "$auth" -a "$auth" != "unknown"

}
test_domain_system_auth()
{

   test -n "$SYSTEM_AUTH" ||
       SYSTEM_AUTH=local
   _command /usr/sbin/control system-auth
   _command test "$SYSTEM_AUTH" != "local" || return 2

}
is_system_auth_local()
{

   test "$SYSTEM_AUTH" = "local"

}
check_system_policy()
{

   local policy=
   policy=$(/usr/sbin/control system-policy)
   _command /usr/sbin/control system-policy
   _command readlink -f /etc/pam.d/system-policy
   _command -x cat /etc/pam.d/system-policy
   test -n "$policy" -a "$policy" != "unknown"

}
test_gpupdate_system_policy()
{

   test -n "$SYSTEM_POLICY" ||
       SYSTEM_POLICY=local
   _command /usr/sbin/control system-policy
   _command test "$SYSTEM_POLICY" == "gpupdate" || return 2

}
check_krb5_conf_exists()
{

   local retval=0
   _command ls -l /etc/krb5.conf
   if ! test -e /etc/krb5.conf; then
       is_system_auth_local && retval=2 || retval=1
   else
       _command -x cat /etc/krb5.conf
   fi
   return $retval

}
check_krb5_conf_ccache()
{

   local ccache=
   ccache=$(/usr/sbin/control krb5-conf-ccache)
   _command /usr/sbin/control krb5-conf-ccache
   test -n "$ccache" -a "$ccache" != "unknown"

}
test_keyring_krb5_conf_ccache()
{

   local ccache=
   ccache=$(/usr/sbin/control krb5-conf-ccache)
   _command /usr/sbin/control krb5-conf-ccache
   _command test -n "$ccache" -a "$ccache" == "keyring" || return 2

}
check_krb5_conf_kdc_lookup()
{

   local retval=0
   echo -n "/etc/krb5.conf: dns_lookup_kdc "
   if grep -q '^\s*dns_lookup_kdc\s*=\s*\([Tt][Rr][Uu][Ee]\|1\|[Yy][Ee][Ss]\)\s*$' /etc/krb5.conf; then
       echo "is enabled"
   else
       if grep -q '^\s*dns_lookup_kdc\s*=' /etc/krb5.conf; then
           echo "is disabled"
           retval=1
       else
           echo "is enabled by default"
           retval=2
       fi
   fi
   echo
   return $retval

}
check_krb5_keytab_exists()
{

   local retval=0
   _command ls -l /etc/krb5.keytab
   if ! test -e /etc/krb5.keytab; then
       is_system_auth_local && retval=2 || retval=1
   fi
   return $retval

}
check_keytab_credential_list()
{

   local retval=0
   if ! is_root; then
       __not_root_skip && return 102
   fi

   if ! _command -r klist -ke; then
       is_system_auth_local && retval=2 || retval=1
   fi
   return $retval

}
check_resolv_conf()
{

   local retval=0
   _command ls -l /etc/resolv.conf
   _command -x cat /etc/resolv.conf

}
compare_resolv_conf_with_default_realm()
{

   echo "SEARCH_DOMAIN = '$SEARCH_DOMAIN'"
   echo "KRB5_DEFAULT_REALM = '$KRB5_DEFAULT_REALM'"
   echo
   local domain=
   local realm=
   domain=$(echo "$SEARCH_DOMAIN" | tr '[:upper:]' '[:lower:]')
   realm=$(echo "$KRB5_DEFAULT_REALM" | tr '[:upper:]' '[:lower:]')

   if test -z "$realm"; then
       return 2
   fi
   test -n "$domain" || return 2
   test "$domain" = "$realm" || return 2

}
check_smb_conf()
{

   local retval=0
   _command ls -l /etc/samba/smb.conf
   _command -x grep -v -e "'^\s*[#;]'" -e "'^\s*$'" /etc/samba/smb.conf
   _command -x testparm -l -s

}
compare_smb_realm_with_krb5_default_realm()
{

   echo "SMB_REALM = '$SMB_REALM'"
   echo "KRB5_DEFAULT_REALM = '$KRB5_DEFAULT_REALM'"
   echo

   test -n "$SMB_REALM" || return 2
   test -n "$KRB5_DEFAULT_REALM" || return 2
   test "$KRB5_DEFAULT_REALM" = "$SMB_REALM" || return 2

}
test_smb_realm()
{

   local retval=0

   DOMAIN_REALM="$KRB5_DEFAULT_REALM"
   if test -n "$SMB_REALM"; then
       DOMAIN_REALM="$SMB_REALM"
       DOMAIN_DOMAIN="$(echo "$SMB_REALM" | tr '[:upper:]' '[:lower:]')"
   else
       test -z "$DOMAIN_REALM" ||
           DOMAIN_DOMAIN="$(echo "$DOMAIN_REALM" | tr '[:upper:]' '[:lower:]')"
       test -n "$DOMAIN_REALM" ||
           DOMAIN_REALM="$(echo "$DOMAIN_DOMAIN" | tr '[:lower:]' '[:upper:]')"
       is_system_auth_local && retval=2 || retval=1
   fi

   echo "DOMAIN_REALM = '$DOMAIN_REALM'"
   echo "DOMAIN_DOMAIN = '$DOMAIN_DOMAIN'"
   echo

   return $retval

}
test_domainname()
{

   HOSTNAME_DOMAIN=$(hostname -d)

   if test "$HOSTNAME_DOMAIN" = "$HOSTNAME_SHORT" ||
           test "$HOSTNAME_DOMAIN" = '(none)' ||
           test -z "$HOSTNAME_DOMAIN"; then
       HOSTNAME_DOMAIN=
       echo "HOSTNAME_DOMAIN = '$HOSTNAME_DOMAIN'"
       echo
       return 2
   fi

   if test -z "$DOMAIN_DOMAIN"; then
       DOMAIN_DOMAIN="$HOSTNAME_DOMAIN"
       test -n "$DOMAIN_REALM" ||
           DOMAIN_REALM="$(echo "$DOMAIN_DOMAIN" | tr '[:lower:]' '[:upper:]')"
       echo "HOSTNAME_DOMAIN = '$HOSTNAME_DOMAIN'"
       echo "Update realm and domain from HOSTNAME_DOMAIN:"
       echo " DOMAIN_REALM = '$DOMAIN_REALM'"
       echo " DOMAIN_DOMAIN = '$DOMAIN_DOMAIN'"
       echo
       return 2
   fi

   echo "HOSTNAME_DOMAIN = '$HOSTNAME_DOMAIN'"
   echo
   test "$HOSTNAME_DOMAIN" = "$DOMAIN_DOMAIN" || return 1

}
check_time_synchronization()
{

   local retval=0
   _command timedatectl || return 1

}
test_time_synchronization()
{

   local retval=0
   local func="test \$(timedatectl show -p NTPSynchronized --value) == \"yes\""
   __command_msg "$func"
   _command -q "$func" || retval=2
   return $retval

}
_check_nameserver()
{

   local ns="$1"
   if _command ping -c 2 -i2 "$ns"; then
       test -z "$DOMAIN_DOMAIN" || _command host "$DOMAIN_DOMAIN" "$ns"
   else
       return 1
   fi

}
check_nameservers()
{

   retval1=0
   retval2=0
   retval3=0
   if [ -n "$NAMESERVER1" ]; then
       _check_nameserver "$NAMESERVER1" || retval1=1
   fi
   if [ -n "$NAMESERVER2" ]; then
       _check_nameserver "$NAMESERVER2" || retval2=1
   fi
   if [ -n "$NAMESERVER3" ]; then
       _check_nameserver "$NAMESERVER3" || retval3=1
   fi
   if test "$retval1" = 0 -a "$retval2" = 0 -a "$retval3" = 0; then
       return 0;
   fi
   if test "$retval1" = 1 -a "$retval2" = 1 -a "$retval3" = 1; then
       return 1;
   fi
   return 2

}
_ldap_get_computer()
{

   local retval=0
   local dc="$1"
   local computer="$2"
   local filter=""
   local domain_dn=
   if test -n "${3+x}"; then
       filter="$3"
   fi
   domain_dn=$(echo $DOMAIN_DOMAIN | sed 's/\./,dc=/g' | sed 's/^/dc=/')
   local searchcmd="ldapsearch -o nettimeout=30 -Y GSSAPI -N -h $dc -b $domain_dn"
   searchcmd="$searchcmd \"(&(ObjectClass=computer)(objectCategory=Computer)(name=$computer))\""
   __command_msg "$searchcmd $filter"
   _command -q "$searchcmd" "$filter" || retval=2
   return $retval

}
_check_domain_controller()
{

   local retval=0
   local dc="$1"
   local computer=
   local ldap_computer=
   local computer=
   local hostname_upper=
   hostname_upper=$(echo $HOSTNAME_SHORT | tr '[:lower:]' '[:upper:]')
   local domain_upper=
   domain_upper=$(echo $DOMAIN_DOMAIN | tr '[:lower:]' '[:upper:]')
   local kinit_realm="$hostname_upper\$\@$domain_upper"
   if is_root; then
       KRB5CCNAME="FILE:/tmp/domain-diag_krb5cc_%{uid}"
       _command kinit -k "$kinit_realm" || retval=2
       if test "$retval" != "0"; then
           is_system_auth_local && return 2 || return 1
       fi
   fi
   
   computer="$(echo $1 | sed 's/\..*$//')"
   _ldap_get_computer "$dc" "$computer" "| grep 'operating\|name:' | cut -d ' ' -f 2 | tr '\n' ' '" || retval=2
   
   __newline
   _command kdestroy -A
   return $retval

}
check_domain_controllers()
{

   local retval=2
   local hostcmd="host -t srv _ldap._tcp.$DOMAIN_DOMAIN | cut -d ' ' -f 8"
   local resolv_msg=
   local controllers_names=
   __command_msg "$hostcmd"
   controllers_names=$(_command -q "$hostcmd" || retval=2)
   echo $controllers_names | sed 's/ /\n/g'
   echo
   for controller_name in $controllers_names; do
       resolv_msg="host $controller_name | sed 's/^.* //g'"
       _command "$resolv_msg"
   done
   for controller_name in $controllers_names; do
       # TODO: Add controller check by ip
       _check_domain_controller $controller_name && retval=0
   done
   test -z "$controllers_names" && retval=2
   ! is_system_auth_local && test $retval != 0 && retval=1
   return $retval

}
check_kerberos_and_ldap_srv_records()
{

   test -n "$DOMAIN_DOMAIN" || return 1
   _command host -t srv "_kerberos._udp.$DOMAIN_DOMAIN"
   _command host -t srv "_ldap._tcp.$DOMAIN_DOMAIN"

}
compare_netbios_name()
{

   local netbios=
   local host=
   netbios=$(echo "$SMB_NETBIOS_NAME" | tr '[:upper:]' '[:lower:]')
   host=$(echo "$HOSTNAME_SHORT" | tr '[:upper:]' '[:lower:]')

   echo "SMB_NETBIOS_NAME = '$SMB_NETBIOS_NAME'"
   echo "HOSTNAME_SHORT = '$HOSTNAME_SHORT'"
   echo
   test "$netbios" = "$host" || return 1

}
check_common_packages()
{

   local retval=0
   _command rpm -q alterator-auth || retval=1
   _command rpm -q libnss-role || retval=1
   _command rpm -q libkrb5 || retval=1
   _command rpm -q libsmbclient || retval=1
   return $retval

}
check_group_policy_packages()
{

   local retval=0
   _command rpm -q local-policy || retval=1
   _command rpm -q gpupdate || retval=1
   return $retval

}
check_sssd_ad_packages()
{

   local retval=0
   _command rpm -q task-auth-ad-sssd || retval=1
   return $retval

}
check_sssd_winbind_packages()
{

   local retval=0
   _command rpm -q task-auth-ad-winbind || retval=2
   return $retval

}
list_run()
{

   test -z $verbose &&
       echo "$1" ||
       echo "$1: $2"

}
custom_run()
{

   if echo "$customcmd"  | tr ' ' '\n' | grep -q "^$1\$"; then
       run "$1" "$2"
   fi

}
init_log()
{

   local log_index
   if test -e "$logfile" && test "$logfile" != "/dev/null" && test -z "$force"; then
       log_index=$(find . -maxdepth 1 -name "$logfile.*" 2>/dev/null | sort -V | tail -1 | sed -E 's/^.*\.([^.]*)$/\1/' || true)
       logfile="$logfile".$(($log_index + 1))
   fi
   if test "$logfile" != "/dev/null"; then
       echo -n > "$logfile"
   fi

}
init_vars()
{

   local host=
   host=$(hostname)
   local domain realm
   HOSTNAME_COMMON="$host"
   HOSTNAME_SHORT=$(hostname -s)
   HOSTNAME_FQDN=$(hostname -f)

   NAMESERVER1=$(grep "^nameserver\s\+" /etc/resolv.conf | sed -e 's/^nameserver\s\+//' -e 's/\s/\n/' | head -1)
   NAMESERVER2=$(grep "^nameserver\s\+" /etc/resolv.conf | sed -e 's/^nameserver\s\+//' -e 's/\s/\n/' | head -2 | tail -1)
   NAMESERVER3=$(grep "^nameserver\s\+" /etc/resolv.conf | sed -e 's/^nameserver\s\+//' -e 's/\s/\n/' | head -3 | tail -1)

   SMB_REALM=
   SMB_NETBIOS_NAME=
   if which testparm >/dev/null 2>&1; then
       SMB_REALM=$(testparm -l -v -s 2>/dev/null | grep "^\s*realm\s*=" | sed -e 's/^\s*realm\s*=\s*//' -e 's/\s*$//')
       SMB_NETBIOS_NAME=$(testparm -l -v -s 2>/dev/null | grep "^\s*netbios name\s*=" | sed -e 's/^\s*netbios name\s*=\s*//' -e 's/\s*$//')
   fi

   SEARCH_DOMAIN=
   if test -f /etc/resolv.conf; then
       SEARCH_DOMAIN=$(grep "^search\s\+" /etc/resolv.conf || true | sed -e 's/^search\s\+//' -e 's/\s/\n/' | head -1 )
   fi

   KRB5_DEFAULT_REALM=
   if test -e /etc/krb5.conf; then
       KRB5_DEFAULT_REALM=$(grep "^\s*default_realm\s\+" /etc/krb5.conf | sed -e 's/^\s*default_realm\s*=\s*//' -e 's/\s*$//')
   fi

   domain=$(echo "$SEARCH_DOMAIN" | tr '[:upper:]' '[:lower:]')
   realm=$(echo "$KRB5_DEFAULT_REALM" | tr '[:upper:]' '[:lower:]')

   DOMAIN_DOMAIN="$domain"
   if test -n "$realm"; then
       DOMAIN_DOMAIN="$realm"
   fi

   SYSTEM_AUTH="$(/usr/sbin/control system-auth)"
   SYSTEM_POLICY="$(/usr/sbin/control system-policy)"

}
test -z $listcmd || runcmd=list_run
init_log
print_head
init_vars
test -z "$customcmd" || runcmd=custom_run
$runcmd check_hostnamectl "Check hostname persistance"
$runcmd test_hostname "Test hostname is FQDN (not short)"
$runcmd check_system_auth "System authentication method"
$runcmd test_domain_system_auth "Domain system authentication enabled"
$runcmd check_system_policy "System policy method"
$runcmd test_gpupdate_system_policy "System group policy enabled"
$runcmd check_krb5_conf_exists "Check Kerberos configuration exists"
$runcmd check_krb5_conf_ccache "Kerberos credential cache status"
$runcmd test_keyring_krb5_conf_ccache "Using keyring as kerberos credential cache"
$runcmd check_krb5_conf_kdc_lookup "Check DNS lookup kerberos KDC status"
$runcmd check_krb5_keytab_exists "Check machine crendetial cache is exists"
$runcmd check_keytab_credential_list "Check machine credentials list in keytab"
$runcmd check_resolv_conf "Check nameserver resolver configuration"
$runcmd compare_resolv_conf_with_default_realm "Compare krb5 realm and first search domain"
$runcmd check_smb_conf "Check Samba configuration"
$runcmd compare_smb_realm_with_krb5_default_realm "Compare samba and krb5 realms"
$runcmd test_smb_realm "Check Samba domain realm"
$runcmd test_domainname "Check hostname FQDN domainname"
$runcmd check_time_synchronization "Check time synchronization"
$runcmd test_time_synchronization "Time synchronization enabled"
$runcmd check_nameservers "Check nameservers availability"
$runcmd check_domain_controllers "Check domain controllers list"
$runcmd check_kerberos_and_ldap_srv_records "Check Kerberos and LDAP SRV-records"
$runcmd compare_netbios_name "Compare NetBIOS name and hostname"
$runcmd check_common_packages "Check common packages"
$runcmd check_group_policy_packages "Check group policy packages"
$runcmd check_sssd_ad_packages "Check SSSD AD packages"
$runcmd check_sssd_winbind_packages "Check SSSD Winbind packages"


test -f "$logfile" && test -w "$logfile" &&

       sed -i 's/\x1b\[[0-9;]*[mGKH]//g' $logfile