diff options
Diffstat (limited to 'perl-install/security/msec.pm')
| -rw-r--r-- | perl-install/security/msec.pm | 356 |
1 files changed, 356 insertions, 0 deletions
diff --git a/perl-install/security/msec.pm b/perl-install/security/msec.pm new file mode 100644 index 000000000..4e105f264 --- /dev/null +++ b/perl-install/security/msec.pm @@ -0,0 +1,356 @@ +package security::msec; + +use strict; +use vars qw($VERSION); + +$VERSION = "0.2"; + +=head1 NAME + +msec - Perl functions to handle msec configuration files + +=head1 SYNOPSYS + + require security::msec; + + my $msec = new msec; + + $secure_level = get_secure_level($prefix); + + @functions = $msec->get_functions($prefix); + foreach @functions { %options{$_} = $msec->get_function_value($prefix, $_) } + foreach @functions { %defaults{$_} = $msec->get_function_default($prefix, $_) } + foreach @functions { $msec->config_function($prefix, $_, %options{$_}) } + + @checks = $msec->get_checks($prefix); + foreach @checks { %options{$_} = $msec->get_check_value($prefix, $_) } + foreach @checks { %defaults{$_} = $msec->get_check_default($prefix, $_) } + foreach @checks { $msec->config_check($prefix, $_, %options{$_}) } + +=head1 DESCRIPTION + +C<msec> is a perl module used by draksec to customize the different options +that can be set in msec's configuration files. + +=head1 COPYRIGHT + +Copyright (C) 2000,2001,2002 MandrakeSoft <cbelisle@mandrakesoft.com> + +This program is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +This program is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +GNU General Public License for more details. + +You should have received a copy of the GNU General Public License +along with this program; if not, write to the Free Software +Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + +=cut + +use MDK::Common; + +# *********************************************** +# PRIVATE FUNCTIONS +# *********************************************** +sub config_option { + my ($prefix, $option, $value, $category) =@_; + my %options_hash = ( ); + my $key = ""; + my $options_file = ""; + + if($category eq "functions") { $options_file = "$prefix/etc/security/msec/level.local"; } + elsif($category eq "checks") { $options_file ="$prefix/etc/security/msec/security.conf"; } + + if(-e $options_file) { + open F, $options_file; + if($category eq "functions") { + while(<F>) { + if (!($_ =~ /^from mseclib/) && $_ ne "\n") { + my ($name, $value_set) = split (/\(/, $_); + chop $value_set; chop $value_set; + $options_hash{$name} = $value_set; + } + } + } + elsif($category eq "checks") { + %options_hash = getVarsFromSh($options_file); + } + close F; + } + + $options_hash{$option} = $value; + + open F, '>'.$options_file; + if ($category eq "functions") { print F "from mseclib import *\n\n"; } + foreach $key (keys %options_hash) { + if ($options_hash{$key} ne "default") { + if($category eq "functions") { print F "$key"."($options_hash{$key})\n"; } + elsif($category eq "checks") { print F "$key=$options_hash{$key}\n"; } + } + } + close F; +} + +sub get_default { + my ($prefix, $option, $category) = @_; + my $default_file = ""; + my $default_value = ""; + my $num_level = 0; + + if ($category eq "functions") { + my $word_level = get_secure_level($prefix); + if ($word_level eq "Dangerous") { $num_level = 0 } + elsif ($word_level eq "Poor") { $num_level = 1 } + elsif ($word_level eq "Standard") { $num_level = 2 } + elsif ($word_level eq "High") { $num_level = 3 } + elsif ($word_level eq "Higher") { $num_level = 4 } + elsif ($word_level eq "Paranoid") { $num_level = 5 } + $default_file = "$prefix/usr/share/msec/level.".$num_level; + } + elsif ($category eq "checks") { $default_file = "$prefix/var/lib/msec/security.conf"; } + + open F, $default_file; + if($category eq "functions") { + while(<F>) { + if ($_ =~ /^$option/) { (undef, $default_value) = split(/ /, $_); } + } + } + elsif ($category eq "checks") { + while(<F>) { + if ($_ =~ /^$option/) { (undef, $default_value) = split(/=/, $_); } + } + } + close F; + chop $default_value; + + $default_value; +} + +# *********************************************** +# EXPLANATIONS +# *********************************************** +sub seclevel_explain { +"Standard: This is the standard security recommended for a computer that will be used to connect + to the Internet as a client. + +High: There are already some restrictions, and more automatic checks are run every night. + +Higher: The security is now high enough to use the system as a server which can accept + connections from many clients. If your machine is only a client on the Internet, you + should choose a lower level. + +Paranoid: This is similar to the previous level, but the system is entirely closed and security + features are at their maximum + +Security Administrator: + If the 'Security Alerts' option is set, security alerts will be sent to this user (username or + email)"; +} + +# *********************************************** +# SPECIFIC OPTIONS +# *********************************************** + +# get_secure_level(prefix) - Get the secure level +sub get_secure_level { + shift @_; + my $prefix = $_; + my $num_level = 2; + + $num_level = cat_("$prefix/etc/profile") =~ /export SECURE_LEVEL=(\d+)/ && $1 || + cat_("$prefix/etc/profile.d/msec.sh") =~ /export SECURE_LEVEL=(\d+)/ && $1 || + ${{ getVarsFromSh("$prefix/etc/sysconfig/msec") }}{SECURE_LEVEL}; + # || $ENV{SECURE_LEVEL}; + + if ($num_level == 0) { return "Dangerous" } + elsif ($num_level == 1) { return "Poor" } + elsif ($num_level == 2) { return "Standard" } + elsif ($num_level == 3) { return "High" } + elsif ($num_level == 4) { return "Higher" } + elsif ($num_level == 5) { return "Paranoid" } +} + +sub get_seclevel_list { + qw(Standard High Higher Paranoid); +} + +sub set_secure_level { + my $word_level = $_[1]; + my $num_level = 0; + + if ($word_level eq "Dangerous") { $num_level = 0 } + elsif ($word_level eq "Poor") { $num_level = 1 } + elsif ($word_level eq "Standard") { $num_level = 2 } + elsif ($word_level eq "High") { $num_level = 3 } + elsif ($word_level eq "Higher") { $num_level = 4 } + elsif ($word_level eq "Paranoid") { $num_level = 5 } + + system "/usr/sbin/msec", $num_level; +} + +# *********************************************** +# FUNCTIONS (level.local) RELATED +# *********************************************** + +# get_functions(prefix) - +# return a list of functions handled by level.local (see +# man mseclib for more info). +sub get_functions { + shift; + my ($prefix, $category) = @_; + my @functions = (); + my (@tmp_network_list, @tmp_system_list); + + ## TODO handle 3 last functions here so they can be removed from this list + my @ignore_list = qw(indirect commit_changes closelog error initlog log set_secure_level + set_security_conf set_server_level print_changes get_translation + create_server_link); + + my @network_list = qw(accept_bogus_error_responses accept_broadcasted_icmp_echo accept_icmp_echo + enable_dns_spoofing_protection enable_ip_spoofing_protection + enable_log_strange_packets enable_promisc_check no_password_aging_for); + + my @system_list = qw(allow_autologin allow_issues allow_reboot allow_remote_root_login + allow_root_login allow_user_list allow_x_connections allow_xserver_to_listen + authorize_services enable_at_crontab enable_console_log enable_libsafe + enable_msec_cron enable_pam_wheel_for_su enable_password enable_security_check + enable_sulogin password_aging password_history password_length set_root_umask + set_shell_history_size set_shell_timeout set_user_umask); + + my $file = "$prefix/usr/share/msec/mseclib.py"; + my $function = ''; + + print "$prefix\n"; + # read mseclib.py to get each function's name and if it's + # not in the ignore list, add it to the returned list. + open F, $file; + while (<F>) { + if ($_ =~ /^def/) { + (undef, $function) = split(/ /, $_); + ($function, undef) = split(/\(/, $function); + if (!(member($function, @ignore_list))) { + if($category eq "network" && member($function, @network_list)) { push(@functions, $function) } + elsif($category eq "system" && member($function, @system_list)) { push(@functions, $function) } + } + } + } + close F; + + @functions; +} + +# get_function_value(prefix, function) - +# return the value of the function passed in argument. If no value is set, +# return "default". +sub get_function_value { + my ($prefix, $function) = @_; + my $value = ''; + my $msec_options = "$prefix/etc/security/msec/level.local"; + my $found = 0; + + if (-e $msec_options) { + open F, $msec_options; + while(<F>) { + if($_ =~ /^$function/) { + (undef, $value) = split(/\(/, $_); + chop $value; chop $value; + $found = 1; + } + } + close F; + if ($found == 0) { $value = "default" } + } + else { $value = "default" } + + $value; +} + +# get_function_default(prefix, function) - +# return the default value of the function according to the security level +sub get_function_default { + shift; + my ($prefix, $function) = @_; + return get_default($prefix, $function, "functions"); +} + +# config_function(prefix, function, value) - +# Apply the configuration to 'prefix'/etc/security/msec/level.local +sub config_function { + my ($prefix, $function, $value) = @_; + config_option($prefix, $function, $value, "functions"); +} + +# *********************************************** +# PERIODIC CHECKS (security.conf) RELATED +# *********************************************** + +# get_checks(prefix) - +# return a list of periodic checks handled by security.conf +sub get_checks { + my $prefix = $_; + my $check; + my @checks = (); + + my $check_file = "$prefix/var/lib/msec/security.conf"; + my @ignore_list = qw(MAIL_USER); + + if (-e $check_file) { + open F, $check_file; + while (<F>) { + ($check, undef) = split(/=/, $_); + if(!(member($check, @ignore_list))) { push(@checks, $check) } + } + close F; + } + + @checks; +} + +# get_check_value(prefix, check) +# return the value of the check passed in argument +sub get_check_value { + shift @_; + my ($prefix, $check) = @_; + my $check_file = "$prefix/etc/security/msec/security.conf"; + my $value = ''; + my $found = 0; + + if (-e $check_file) { + open F, $check_file; + while(<F>) { + if($_ =~ /^$check/) { + (undef, $value) = split(/=/, $_); + chop $value; + $found = 1; + } + } + close F; + if ($found == 0) { $value = "default" } + } + else { $value = "default" } + + $value; +} + +# get_check_default(prefix, check) +# Get the default value according to the security level +sub get_check_default { + my ($prefix, $check) = @_; + return get_default($prefix, $check, "checks"); +} + +# config_check(prefix, check, value) +# Apply the configuration to "prefix"/etc/security/msec/security.conf +sub config_check { + shift @_; + my ($prefix, $check, $value) = @_; + config_option($prefix, $check, $value, "checks"); +} + +sub new { shift } +1; |