#!/usr/bin/perl
# 
# This removes a bad key from a 
# 
# This program is setuid 'admin' and calls a (new) peer to read its host name and system UUID. It takes the 
# target's password in via a file.
# 
# Exit codes;
# 0 = Normal exit.
# 1 = No database connection.
# 2 = Job not found.
# 3 = No offending keys found.
# 
# TODO: Record the keys we remove, then check for the same keys on any other machine we know about. If any 
#       are found on those machines, create a job for that host to remove the same.
#       Also, look in the 'ip_addresses' table for any matching keys and delete them.
# 

use strict;
use warnings;
use Anvil::Tools;

my $THIS_FILE           =  ($0 =~ /^.*\/(.*)$/)[0];
my $running_directory   =  ($0 =~ /^(.*?)\/$THIS_FILE$/)[0];
if (($running_directory =~ /^\./) && ($ENV{PWD}))
{
	$running_directory =~ s/^\./$ENV{PWD}/;
}

# Turn off buffering so that the pinwheel will display while waiting for the SSH call(s) to complete.
$| = 1;

my $anvil = Anvil::Tools->new();
$anvil->Log->level({set => 2});
$anvil->Log->secure({set => 1});
$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, level => 2, secure => 0, key => "log_0115", variables => { program => $THIS_FILE }});

# Read switches (target ([user@]host[:port]) and the file with the target's password. If the password is 
# passed directly, it will be used. Otherwise, the password will be read from the database.
$anvil->data->{switches}{'job-uuid'} = "";
$anvil->Get->switches;
$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { 
	'switches::job-uuid' => $anvil->data->{switches}{'job-uuid'},
}});

$anvil->Database->connect();
$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, level => 3, secure => 0, key => "log_0132"});
if (not $anvil->data->{sys}{database}{connections})
{
	# No databases, update the job, sleep for a bit and then exit. The daemon will pick it up and try 
	# again after we exit.
	$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, 'print' => 1, level => 0, priority => "err", key => "error_0077"});
	sleep 10;
	$anvil->nice_exit({exit_code => 1});
}

# Pick up the job details
load_job_data($anvil);

# Process the bad keys
process_keys($anvil);

# Done.
update_progress($anvil, 100, "job_0051");
$anvil->nice_exit({exit_code => 0});


#############################################################################################################
# Functions                                                                                                 #
#############################################################################################################

sub process_keys
{
	my ($anvil) = @_;
	
	foreach my $state_uuid (@{$anvil->data->{state_uuids}})
	{
		$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { state_uuid => $state_uuid }});
		my $query = "
SELECT 
    state_host_uuid, 
    state_name, 
    state_note 
FROM 
    states 
WHERE 
    state_uuid = ".$anvil->Database->quote($state_uuid)." 
;";
		$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { query => $query }});
		my $results = $anvil->Database->query({query => $query, source => $THIS_FILE, line => __LINE__});
		my $count   = @{$results};
		$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { 
			results => $results, 
			count   => $count, 
		}});
		if (not $count)
		{
			# No bad keys found on this host.
			$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, 'print' => 1, level => 0, priority => "err", key => "error_0078"});
			sleep 10;
			$anvil->nice_exit({exit_code => 2});
		}
		foreach my $row (@{$results})
		{
			
			my $state_host_uuid = $row->[0];
			my $state_name      = $row->[1];
			my $state_note      = $row->[2];
			$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { 
				's1:sys::host_uuid'  => $anvil->data->{sys}{host_uuid},
				's2:state_host_uuid' => $state_host_uuid, 
				's3:state_name'      => $state_name, 
				's4:state_note'      => $state_note, 
			}});
			
			# Is this meant for us?
			if ($state_host_uuid ne $anvil->data->{sys}{host_uuid})
			{
				# Um...
				$anvil->data->{job}{progress} += 10;
				update_progress($anvil, $anvil->data->{job}{progress}, "job_0058,!!state_uuid!".$state_uuid."!!,!!host_uuid!".$state_host_uuid."!!");
				$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, 'print' => 1, level => 2, key => "job_0058", variables => { 
					state_uuid => $state_uuid,
					host_uuid  => $state_host_uuid, 
				}});
				next;
			}
			
			### NOTE: We don't need the file or line anymore, but we're not removing it as having
			###       a record of the trigger might be useful someday.
			# Pull out the details.
			my $bad_file = "";
			my $bad_line = "";
			foreach my $pair (split/,/, $state_note)
			{
				my ($variable, $value) = ($pair =~ /^(.*?)=(.*)$/);
				$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { 
					pair     => $pair, 
					variable => $variable, 
					value    => $value,
				}});
				if ($variable eq "file")
				{
					$bad_file = $value;
					$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { bad_file => $bad_file }});
				}
				if ($variable eq "line")
				{
					$bad_line = $value;
					$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { bad_line => $bad_line }});
				}
			}
			my ($target) = ($state_name =~ /host_key_changed::(.*)$/);
			$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { 
				target   => $target, 
				bad_file => $bad_file, 
				bad_line => $bad_line, 
			}});
			
			# Read in the specified bad file, then find any other files that might have matching bad keys.
			process_file($anvil, "/root/.ssh/known_hosts", $target);
			
			# Walk through any other users.
			my $directory = "/home";
			local(*DIRECTORY);
			opendir(DIRECTORY, $directory);
			while(my $file = readdir(DIRECTORY))
			{
				next if $file eq ".";
				next if $file eq "..";
				my $full_path = $directory."/".$file;
				$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 3, list => { 
					file      => $file,
					full_path => $full_path,
				}});
				
				# If we're looking at a directory, scan it. Otherwise, see if it's an executable and that it
				# starts with 'scan-*'.
				if (-d $full_path)
				{
					# Check for a known_hosts file.
					my $known_hosts = $full_path."/.ssh/known_hosts";
					$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 3, list => { known_hosts => $known_hosts }});
					if (-e $known_hosts)
					{
						process_file($anvil, $known_hosts, $target);
					}
				}
			}
			closedir(DIRECTORY);
			
			delete_state($anvil, $state_uuid);
		}
	}
	
	return(0);
}

# Look through the file for bad keys.
sub process_file
{
	my ($anvil, $file, $target) = @_;
	$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { 
		file   => $file,
		target => $target, 
	}});
	
	$anvil->data->{job}{progress} += 5;
	update_progress($anvil, $anvil->data->{job}{progress}, "job_0049,!!file!".$file."!!,!!target!".$target."!!");
	$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, 'print' => 1, level => 2, key => "job_0049", variables => {
		file   => $file, 
		target => $target, 
	}});
	
	# Read in the file, if it exists.
	if (not -e $file)
	{
		# File doesn't actually exist, wtf?
		$anvil->data->{job}{progress} += 10;
		update_progress($anvil, $anvil->data->{job}{progress}, "job_0050,!!file!".$file."!!");
		$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, 'print' => 1, level => 2, key => "job_0050", variables => { file => $file }});
		
		return(1); 
	}
	
	# Read in the file
	my ($old_body) = $anvil->Storage->read_file({file => $file});
	if ($old_body eq "!!error!!")
	{
		# Failed to read the file
		$anvil->data->{job}{progress} += 5;
		update_progress($anvil, $anvil->data->{job}{progress}, "job_0052,!!file!".$file."!!");
		$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, 'print' => 1, level => 2, key => "job_0052", variables => { file => $file }});
		
		return(1);
	}
	
	# Find our key(s)
	my $line_number = 0;
	my $new_body    = "";
	my $update      = 0;
	foreach my $line (split/\n/, $old_body)
	{
		$line_number++;
		$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { 
			's1:line_number' => $line_number,
			's2:line'        => $line, 
		}});
		
		# If the line starts with our target, remove it.
		if ($line =~ /^$target /)
		{
			# Found it!
			$anvil->data->{job}{progress} += 5;
			update_progress($anvil, $anvil->data->{job}{progress}, "job_0053,!!line!".$line_number."!!");
			$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, 'print' => 1, level => 2, key => "job_0053", variables => { line => $line_number }});
			
			$update = 1;
			$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { update => $update }});
		}
		else
		{
			$new_body .= $line."\n";
		}
	}
	
	$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { 
		's1:old_body' => $old_body, 
		's2:new_body' => $new_body, 
		's3:update'   => $update,
	}});
	if ($update)
	{
		# Write the file out.
		$anvil->data->{job}{progress} += 5;
		update_progress($anvil, $anvil->data->{job}{progress}, "job_0055,!!file!".$file."!!");
		$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, 'print' => 1, level => 2, key => "job_0055", variables => { file => $file }});
		
		# Get the owning user and group.
		my ($owning_uid, $owning_gid) = (stat($file))[4,5];
		my $owning_user               = getpwuid($owning_uid);
		my $owning_group              = getpwuid($owning_gid);
		$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { 
			owning_uid   => $owning_uid, 
			owning_gid   => $owning_gid, 
			owning_user  => $owning_user, 
			owning_group => $owning_group,
		}});
		
		my $error = $anvil->Storage->write_file({
			body      => $new_body,
			debug     => 3,
			file      => $file,
			overwrite => 1,
			user      => $owning_user, 
			group     => $owning_group
		});
		$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, secure => 0, list => { error => $error }});
		if ($error)
		{
			$anvil->data->{job}{progress} += 5;
			update_progress($anvil, $anvil->data->{job}{progress}, "job_0059,!!file!".$file."!!");
			$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, 'print' => 1, level => 2, key => "job_0059", variables => { file => $file }});
		}
		else
		{
			# Success!
			$anvil->data->{job}{progress} += 5;
			update_progress($anvil, $anvil->data->{job}{progress}, "job_0060,!!file!".$file."!!");
			$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, 'print' => 1, level => 2, key => "job_0060", variables => { file => $file }});
		}
	}
	
	return(0);
}

# Load the job data or exit
sub load_job_data
{
	my ($anvil) = @_;
	
	if (not $anvil->data->{switches}{'job-uuid'})
	{
		$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, 'print' => 1, level => 0, priority => "err", key => "error_0080"});
		$anvil->nice_exit({exit_code => 1});
	}
	
	my $query = "SELECT job_data FROM jobs WHERE job_uuid = ".$anvil->Database->quote($anvil->data->{switches}{'job-uuid'}).";";
	$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { query => $query }});
	my $results = $anvil->Database->query({query => $query, source => $THIS_FILE, line => __LINE__});
	my $count   = @{$results};
	$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { 
		results => $results, 
		count   => $count, 
	}});
	
	if (not $count)
	{
		$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, 'print' => 1, level => 0, priority => "err", key => "error_0079", variables => {
			job_uuid => $anvil->data->{switches}{'job-uuid'}, 
		}});
		$anvil->nice_exit({exit_code => 1});
	}
	
	# Pick up the data.
	my $job_data = $results->[0]->[0];
	$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { job_data => $job_data }});
	if (not $job_data)
	{
		$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, 'print' => 1, level => 0, priority => "err", key => "error_0081", variables => {
			job_uuid => $anvil->data->{switches}{'job-uuid'}, 
		}});
		$anvil->nice_exit({exit_code => 1});
	}
	
	# Pick up the job.
	$anvil->data->{job}{progress} = 0;
	update_progress($anvil, 0, "clear");
	
	$anvil->data->{job}{progress} += 5;
	update_progress($anvil, $anvil->data->{job}{progress}, "job_0048");
	$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, 'print' => 1, level => 2, key => "job_0048"});
	
	# Break the job up.
	$anvil->data->{state_uuids} = [];
	foreach my $state_uuid (split/,/, $job_data)
	{
		$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { state_uuid => $state_uuid }});
		if ($anvil->Validate->uuid({uuid => $state_uuid}))
		{
			push @{$anvil->data->{state_uuids}}, $state_uuid;
		}
		else
		{
			# Invalid, skip it.
			$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, 'print' => 1, level => 0, priority => "err", key => "error_0082", variables => {
				state_uuid => $state_uuid, 
			}});
		}
	}
	
	my $uuid_count = @{$anvil->data->{state_uuids}};
	$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { uuid_count => $uuid_count }});
	
	# Did I find any actual UUIDs?
	if (not $uuid_count)
	{
		# Nope.
		update_progress($anvil, 100, "error_0083");
		$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, 'print' => 1, level => 2, key => "error_0083"});
	}
	
	return(0);
}

# This deletes a state entry.
sub delete_state
{
	my ($anvil, $state_uuid) = @_;
	
	# Delete it so long as we have a UUID.
	if ($state_uuid)
	{
		my $query = "DELETE FROM states	WHERE state_uuid = ".$anvil->Database->quote($state_uuid).";";
		$anvil->Database->write({debug => 3, query => $query, source => $THIS_FILE, line => __LINE__});
	}
	
	return(0);
}

# This updates the progress if we were called with a job UUID.
sub update_progress
{
	my ($anvil, $progress, $message) = @_;
	
	$progress = 95 if $progress > 100;
	
	# Log the progress percentage.
	$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 3, list => { 
		progress => $progress,
		message  => $message, 
	}});
	
	$anvil->Job->update_progress({
		debug    => 3, 
		progress => $progress, 
		message  => $message, 
		job_uuid => $anvil->data->{switches}{'job-uuid'},
	});
	
	return(0);
}