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#!/usr/local/cpanel/3rdparty/bin/perl # cpanel - scripts/sshcontrol Copyright 2022 cPanel, L.L.C. # All rights reserved. # copyright@cpanel.net http://cpanel.net # This code is subject to the cPanel license. Unauthorized copying is prohibited #---------------------------------------------------------------------- # This script controls a Net::OpenSSH session. # #It can authenticate a connection via password or SSH private key. # #It can connect via: # 1) root login # 2) user login, then su to root # 3) user login, then sudo to root # #Additionally, existing connections may persist and be reused. # #Once connected, it can: # 1) copy a file from/to local/remote # 2) AS ROOT: execute an arbitrary command on the remote server # #Inputs: # key/value are read from STDIN as a hash, # serialized with Cpanel::AdminBin::Serializer::Dump() # # # Required arguments: # authuser The user as which to identify during the SSH login. # # host The remote host. # # ctl "ssh" or (usually "scp", but anything defined will do) # # # Additional, optional arguments: # external_master ctl_pass parameter for Net::OpenSSH # Required if die_on_pid is not given. # # die_on_pid ID of a specific process for the SSH control process # to watch and self-destruct upon the end of that # process. Defaults to the script's process ID. # # port passed to Net::OpenSSH # # root_pass If authuser is "root", used to login; # otherwise, used to escalate privileges via su. # (Don’t submit if you mean to do sudo.) # # ssh_private_key_password passphrase for sshkey # # sshkey filename under $HOME/.ssh/ # # stay_alive boolean; whether to keep the SSH control # process around and pass back its PID and # path in the response # # wheel_pass Used to login as a non-root user. # If there is no root_pass, also used to escalate # privileges via sudo. # # # Additional arguments when ctl is "ssh": # cmd if ctl is "ssh", executed AS ROOT on the remote server # # # Additional arguments when ctl is "scp": # destfile if ctl ne "ssh", passed to Cpanel::SSHControl::scp # NOTE: If ".", value is read from the last node in the # path from srcfile # # direction if ctl ne "ssh", passed to Cpanel::SSHControl::scp # # srcfile if ctl ne "ssh", passed to Cpanel::SSHControl::scp # # #Output: # This speaks the "protocol" that Whostmgr/Remote/Parser.pm understands. # Note that this prints even error statuses to STDOUT. # #---------------------------------------------------------------------- package Script::SSHControl; use strict; use warnings; use IO::Pipe (); use Cpanel::AdminBin::Serializer (); use Cpanel::ForkAsync (); use Cpanel::SSHControl (); use Cpanel::Locale::Lazy 'lh'; use Cpanel::TimeHiRes (); use Cpanel::Exception (); use Cpanel::Sys::Setsid::Fast (); use Cpanel::BinCheck::Lite (); my $ONEDAY = (86400); my @REQUIRED_ARGS = qw( authuser host ctl ); Cpanel::BinCheck::Lite::check_argv(); my $debug = 0; __PACKAGE__->script() unless caller(); sub script { ## no critic qw(Subroutines::ProhibitExcessComplexity) my ($class) = @_; local $\| = 1; local $ENV{'TERM'} = 'dumb'; my $self = {}; bless $self, $class; my $parsed_args = Cpanel::AdminBin::Serializer::SafeLoadFile( \STDIN ); my @missing = grep { !length $parsed_args->{$_} } @REQUIRED_ARGS; if (@missing) { _leave( lh()->maketext( 'Specify the [list_and_quoted,_1] [numerate,_2,parameter,parameters].', \@missing, ( scalar @missing ) ) ); } my $escalation_method; if ( $parsed_args->{'root_escalation_method'} && $parsed_args->{'root_escalation_method'} eq 'none' ) { $escalation_method = 'none'; } else { # NB: Avoid length() here because we want to interpret # root_pass==0 as no root password. my $gave_root_pass = !!$parsed_args->{'root_pass'}; if ( length $parsed_args->{'wheel_pass'} ) { if ( $parsed_args->{'authuser'} eq 'root' ) { _leave( lh()->maketext( 'If “[_1]” is “[_2]”, you cannot specify “[_3]”.', qw(authuser root wheel_pass) ) ); } # Just a wheel/sudo password? Gotta be sudo. if ( !$gave_root_pass ) { $escalation_method = 'sudo'; } } # Root password + non-root = su if ($gave_root_pass) { if ( $parsed_args->{'authuser'} ne 'root' ) { $escalation_method = 'su'; } } } my $cmd = $parsed_args->{'cmd'}; my $ssh_key = $parsed_args->{'sshkey'} ? ( ( getpwuid($>) )[7] . "/.ssh/" . $parsed_args->{sshkey} ) : undef; my $ssh_username = $parsed_args->{'authuser'}; $parsed_args->{'die_on_pid'} \|\|= $$; my $auth_info = { 'ssh_username' => $ssh_username, 'ssh_ip' => $parsed_args->{'host'}, 'ssh_port' => $parsed_args->{'port'}, 'root_pass' => $parsed_args->{'root_pass'} \|\| ( $ssh_username eq 'root' ? $parsed_args->{'wheel_pass'} : undef ), 'wheel_pass' => $parsed_args->{'wheel_pass'}, 'ssh_private_key_password' => $parsed_args->{'ssh_private_key_password'}, 'root_escalation_method' => $escalation_method, 'ssh_private_key' => $ssh_key, 'key_or_pass' => ( $ssh_key ? 1 : 0 ), }; my ( $status, $master_pid, $data ); my $ssh_obj; if ( $parsed_args->{'external_master'} ) { $0 = "sshcontrol parent: $auth_info->{'ssh_ip'} - external master"; $ssh_obj = Net::OpenSSH->new( 'child', external_master => 1, ctl_path => $parsed_args->{'external_master'} ); } else { $0 = "sshcontrol parent: $auth_info->{'ssh_ip'} - create connection"; } my $keep_ssh_master = $parsed_args->{'stay_alive'} ? 1 : 0; if ( $ssh_obj && $ssh_obj->check_master() ) { print "Reused existing connection.\n"; $0 = "sshcontrol parent: $auth_info->{'ssh_ip'} - reused external master"; } else { $0 = "sshcontrol parent: $auth_info->{'ssh_ip'} - creating connection"; if ( $parsed_args->{'external_master'} ) { $keep_ssh_master = 1; } ( $status, $master_pid, $data ) = $self->_create_ssh_master_connection( $auth_info, $parsed_args->{'die_on_pid'} ); if ( !$status ) { _ssh_error_to_whm_remote_error_and_leave($data); } $ssh_obj = Net::OpenSSH->new( 'child', external_master => 1, ctl_path => $data ); } if ( $ssh_obj->error() ) { my $ssh_error = $ssh_obj->error(); _ssh_error_to_whm_remote_error_and_leave($ssh_error); } $0 = "sshcontrol parent: $auth_info->{'ssh_ip'} - attaching to external"; my $ssh_control = Cpanel::SSHControl->new_from_external( 'debug' => 0, 'quiet' => 0, 'verbose' => 0, 'auth_info' => $auth_info, 'ssh' => $ssh_obj ); $0 = "sshcontrol parent: $auth_info->{'ssh_ip'} - attached to external"; $SIG{'TERM'} = sub { $ssh_control->disconnect(); }; if ( $parsed_args->{ctl} eq 'ssh' ) { $0 = "sshcontrol parent: $auth_info->{'ssh_ip'} - ssh"; my ( $status, $msg ) = $ssh_control->exec_as_root($cmd); if ( !$status ) { _ssh_error_to_whm_remote_error_and_leave($msg); } } elsif ( $parsed_args->{'ctl'} eq 'scp' ) { $0 = "sshcontrol parent: $auth_info->{'ssh_ip'} - scp"; my $destfile = $parsed_args->{'destfile'} eq '.' ? ( split( m{/+}, $parsed_args->{'srcfile'} ) )[-1] : $parsed_args->{'destfile'}; my ( $status, $msg ) = $ssh_control->scp( 'direction' => $parsed_args->{'direction'}, 'srcfile' => $parsed_args->{'srcfile'}, 'destfile' => $destfile, ); if ( !$status ) { _ssh_error_to_whm_remote_error_and_leave($msg); } elsif ( $parsed_args->{'direction'} eq 'download' && !-e $destfile ) { _ssh_error_to_whm_remote_error_and_leave("The destination file: “$destfile” failed to download."); } } else { die "Invalid “ctl”: [$parsed_args->{'ctl'}]"; } $self->_write_sshcontrol_info( $master_pid, $ssh_obj ); if ( !$keep_ssh_master \|\| !$master_pid ) { $ssh_control->disconnect_master(); } undef $ssh_obj; return $self; } sub _write_sshcontrol_info { my ( $self, $master_pid, $ssh_obj ) = @_; if ($master_pid) { print "\n==sshcontrolpid=$master_pid==\n"; } print "\n==sshcontrolpath=" . $ssh_obj->get_ctl_path() . "==\n"; return; } sub _leave { my @args = @_; print @args; die "\n"; } sub _create_ssh_master_connection { my ( $self, $auth_info, $die_on_pid ) = @_; my $ssh_pipe = IO::Pipe->new(); my $child_result; my $sshcontrol_pid = Cpanel::ForkAsync::do_in_child( sub { $ssh_pipe->writer(); open( STDOUT, '>&=' . fileno($ssh_pipe) ); ## no critic qw(RequireCheckedOpen) if ($die_on_pid) { $0 = "sshcontrol child: $auth_info->{'ssh_ip'} - waiting on pid $die_on_pid"; } else { $0 = "sshcontrol child: $auth_info->{'ssh_ip'}"; } my $ssh_control = Cpanel::SSHControl->new( 'debug' => 0, 'quiet' => 0, 'verbose' => 0, 'auth_info' => $auth_info ); { local $@; eval { $ssh_control->connect() }; if ($@) { my $error_as_string = Cpanel::Exception::get_string_no_id($@); $error_as_string =~ s/\n/ /g; # This is going to the parent print "\nsshcontrol:0:" . $error_as_string . "\n"; exit(1); } } my $master_pid = $ssh_control->{'ssh'}->get_master_pid(); if ( !$master_pid ) { print "\nsshcontrol:0:failed to create sshcontrol master\n"; exit(1); } $SIG{'HUP'} = 'IGNORE'; $SIG{'ALRM'} = $SIG{'TERM'} = sub { $ssh_control->disconnect_master(); exit(0); }; # This is going to the parent print "\nsshcontrol:1:" . $ssh_control->{'ssh'}->get_ctl_path() . "\n"; Cpanel::Sys::Setsid::Fast::fast_setsid(); open( STDIN, '<', '/dev/null' ); ## no critic qw(RequireCheckedOpen) open( STDOUT, '>', '/dev/null' ); ## no critic qw(RequireCheckedOpen) open( STDERR, '>', '/dev/null' ); ## no critic qw(RequireCheckedOpen) alarm($ONEDAY); # If something gets killed off expire in one day while ( waitpid( $master_pid, 1 ) != -1 && kill( 0, $die_on_pid ) ) { Cpanel::TimeHiRes::sleep(0.1); } $ssh_control->disconnect_master(); waitpid( $master_pid, 0 ); exit(0); } ); $ssh_pipe->reader(); while ( readline($ssh_pipe) ) { if (m{^sshcontrol:}) { $child_result = $_; last; } print; } chomp($child_result); my ( $sshcontrol_tag, $status, $data ) = split( m{:}, $child_result, 3 ); return ( $status, $sshcontrol_pid, $data ); } my @SSH_ERRORS; sub _ssh_error_to_whm_remote_error_and_leave { my ($ssh_error) = @_; if ( !@SSH_ERRORS ) { @SSH_ERRORS = ( [ qr{master process exited unexpectedly:\s+([^:]+).?No such file or directory} => 'RemoteSSHMissing' ], [ qr{No such file or directory} => 'RemoteSSHMissing' ], [ qr{normalize shell} => 'RemoteSSHMissing' ], [ qr{Name or service not known} => 'RemoteSSHHostNotFound' ], [ qr{Connection timed out} => 'RemoteSSHTimeout' ], [ qr{(scp failed)} => 'RemoteSCPError' ], [ qr{(^scp:.)} => 'RemoteSCPError' ], [ qr{(Connection (?:to [^ ]+? )?closed)} => 'RemoteSSHConnectionFailed' ], [ qr{(No route to host)} => 'RemoteSSHConnectionFailed' ], [ qr{(Connection refused)} => 'RemoteSSHConnectionFailed' ], [ qr{(lost connection)} => 'RemoteSSHConnectionFailed' ], [ qr{(Failed to escalate to root)}i => 'RemoteSSHRootEscalationFailed' ], [ qr{(timeout)}i => 'RemoteSSHTimeout' ], [ qr{master process exited unexpectedly:\s+(.)} => 'RemoteSSHAccessDenied' ], #A catch-all, must be last. [ qr<> => 'RemoteSSHAccessDenied' ], ); } for my $re_code (@SSH_ERRORS) { if ( $ssh_error =~ $re_code->[0] ) { my $raw_error = $1 \|\| $ssh_error; $raw_error =~ s/=//g; $raw_error =~ s/\r*\n/ /g; _leave("\n==sshcontrol_error=$re_code->[1]=$raw_error==\n"); } } # If we did not parse the error, we need to show it # but only if we haven't already to avoid showing it twice print $ssh_error . "\n"; #This error is meant to look a bit more "professional" than #"Oops! We should never get here!". :) die "Misdirected execution flow!"; } 1;

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