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# linux-lib.pl
# Functions for reading linux format last output
# passfiles_type()
# Returns 0 for old-style passwords (/etc/passwd only), 1 for FreeBSD-style
# (/etc/master.passwd) and 2 for SysV (/etc/passwd & /etc/shadow)
sub passfiles_type
{
return &password_file($config{'shadow_file'}) ? 2 : 0;
}
# groupfiles_type()
# Returns 0 for normal group file (/etc/group only) and 2 for shadowed
# (/etc/group and /etc/gshadow)
sub groupfiles_type
{
return &password_file($config{'gshadow_file'}) ? 2 : 0;
}
# open_last_command(handle, user, [max])
sub open_last_command
{
my ($fh, $user, $max) = @_;
my $quser = quotemeta($user);
$max = " -n $max" if ($max);
open($fh, "(last -F -w$max $quser || last -w$max $quser) |");
}
# read_last_line(handle)
# Parses a line of output from last into an array of
# user, tty, host, login, logout, period
sub read_last_line
{
$fh = $_[0];
while(1) {
chop($line = <$fh>);
if (!$line) { return (); }
if ($line =~ /system boot/) { next; }
if ($line =~ /^(\S+)\s+(\S+)\s+(\S+)?\s+(\S+\s+\S+\s+\d+\s+\d+:\d+)\s+\-\s+(\S+)\s+\((\d+:\d+)\)/) {
# jcameron pts/0 fudu Thu Feb 22 09:47 - 10:15
return ($1, $2, $3, $4, $5 eq "down" ? "Shutdown" : $5, $6);
}
elsif ($line =~ /^(\S+)\s+(\S+)\s+(\S+)?\s+(\S+\s+\S+\s+\d+\s+\d+:\d+:\d+\s+\d+)\s+\-\s+(\S+\s+\S+\s+\d+\s+\d+:\d+:\d+\s+\d+)\s+\((.*?\d+:\d+)\)/) {
# jcameron pts/0 fudu Thu Feb 22 09:47 - 10:15
# jcameron pts/0 fudu Sun Feb 4 02:26:28 2024 - Wed Feb 7 18:25:09 2024 (3+15:58)
return ($1, $2, $3, $4, $5 eq "down" ? "Shutdown" : $5, $6);
}
elsif ($line =~ /^(\S+)\s+(\S+)\s+(\S+)?\s+(\S+\s+\S+\s+\d+\s+\d+:\d+)\s+(still|gone)/ ||
$line =~ /^(\S+)\s+(\S+)\s+(\S+)?\s+(\S+\s+\S+\s+\d+\s+\d+:\d+:\d+\s+\d+)\s+(still|gone)/) {
# root pts/0 fudu Fri Feb 23 18:46 still logged in
# root ftpd10 fudu Thu Jun 20 11:19 gone - no logout
# root pts/0 fudu Tue Jun 18 23:10:30 2024 still logged in
return ($1, $2, $3, $4);
}
}
}
# os_most_recent_logins()
# Returns hash ref from username to the most recent login as time string
sub os_most_recent_logins
{
my %rv;
&clean_language();
open(LASTLOG, "lastlog |");
while(<LASTLOG>) {
s/\r|\n//g;
if (/^(\S+)/) {
my $user = $1;
if (/((\S+)\s+(\S+)\s+\d+\s+(\d+):(\d+):(\d+)\s+([\-\+]\d+)\s+(\d+))/) {
# Have a date to parse
$rv{$user} = $1;
}
else {
$rv{$user} = undef;
}
}
}
close(LASTLOG);
&reset_environment();
return \%rv;
}
# logged_in_users()
# Returns a list of hashes containing details of logged-in users
sub logged_in_users
{
local @rv;
open(WHO, "who |");
while(<WHO>) {
if (/^(\S+)\s+(\S+)\s+(\S+\s+\d+\s+\d+:\d+)\s+(\((\S+)\))?/) {
push(@rv, { 'user' => $1, 'tty' => $2,
'when' => $3, 'from' => $5 });
}
}
close(WHO);
return @rv;
}
# use_md5()
# Returns 1 if pam is set up to use MD5 encryption, 2 for blowfish, 3 for SHA512
sub use_md5
{
if (defined($use_md5_cache)) {
# Don't re-look this up
return $use_md5_cache;
}
local $md5 = 0;
if (&foreign_check("pam")) {
# Use the PAM module if we can
&foreign_require("pam", "pam-lib.pl");
local @conf = &foreign_call("pam", "get_pam_config");
local ($svc) = grep { $_->{'name'} eq 'passwd' } @conf;
LOOP:
foreach my $m (@{$svc->{'mods'}}) {
if ($m->{'type'} eq 'password') {
if ($m->{'args'} =~ /md5/) {
$md5 = 1;
}
elsif ($m->{'args'} =~ /yescrypt/) {
$md5 = 4;
}
elsif ($m->{'args'} =~ /sha512/) {
$md5 = 3;
}
elsif ($m->{'args'} =~ /blowfish/) {
$md5 = 2;
}
elsif ($m->{'module'} =~ /pam_stack\.so/ &&
$m->{'args'} =~ /service=(\S+)/) {
# Referred to another service!
($svc) = grep { $_->{'name'} eq $1 } @conf;
if ($svc) { goto LOOP }
else { last; }
}
elsif ($m->{'control'} eq 'include') {
# Include another section
($svc) = grep { $_->{'name'} eq $m->{'module'} }
@conf;
if ($svc) { goto LOOP }
else { last; }
}
}
elsif ($m->{'include'}) {
# Include another section, with @ syntax
($svc) = grep { $_->{'name'} eq $m->{'include'} } @conf;
if ($svc) { goto LOOP }
else { last; }
}
}
}
if (!$md5 && &open_readfile(PAM, "/etc/pam.d/passwd")) {
# Otherwise try to check the PAM file directly
while(<PAM>) {
s/#.*$//g;
if (/^password.*md5/) { $md5 = 1; }
elsif (/^password.*blowfish/) { $md5 = 2; }
elsif (/^password.*sha512/) { $md5 = 3; }
elsif (/^password.*yescrypt/) { $md5 = 4; }
}
close(PAM);
}
if (!$md5 && (&open_readfile(PAM, "/etc/pam.d/common-password") ||
&open_readfile(PAM, "/etc/pam.d/system-auth"))) {
# Then try reading common password config file
while(<PAM>) {
s/#.*$//g;
if (/^password.*md5/) { $md5 = 1; }
elsif (/^password.*blowfish/) { $md5 = 2; }
elsif (/^password.*sha512/) { $md5 = 3; }
elsif (/^password.*yescrypt/) { $md5 = 4; }
}
close(PAM);
}
if (&open_readfile(DEFS, "/etc/login.defs")) {
# The login.defs file is used on debian sometimes
while(<DEFS>) {
s/#.*$//g;
$md5 = 1 if (/MD5_CRYPT_ENAB\s+yes/i);
}
close(DEFS);
}
$use_md5_cache = $md5;
return $md5;
}
1;