mirror of
https://github.com/ovh/the-bastion.git
synced 2024-12-29 19:50:50 +08:00
281 lines
9.6 KiB
Perl
Executable file
281 lines
9.6 KiB
Perl
Executable file
#! /usr/bin/perl -T
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# vim: set filetype=perl ts=4 sw=4 sts=4 et:
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# NEEDGROUP osh-groupCreate
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# SUDOERS %osh-groupCreate ALL=(root) NOPASSWD:/usr/bin/env perl -T /opt/bastion/bin/helper/osh-groupCreate *
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# FILEMODE 0700
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# FILEOWN 0 0
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#>HEADER
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use common::sense;
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use Getopt::Long;
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use Term::ReadKey;
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use File::Basename;
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use lib dirname(__FILE__) . '/../../lib/perl';
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use OVH::Bastion;
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use OVH::Bastion::Plugin::groupSetRole;
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local $| = 1;
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#
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# Globals
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#
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$ENV{'PATH'} = '/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/sbin:/usr/local/bin:/usr/pkg/bin';
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my ($self) = $ENV{'SUDO_USER'} =~ m{^([a-zA-Z0-9._-]+)$};
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if (not defined $self) {
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if ($< == 0) {
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$self = 'root';
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}
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else {
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HEXIT('ERR_SUDO_NEEDED', msg => 'This command must be run under sudo');
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}
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}
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# Fetch command options
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my $fnret;
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my ($result, @optwarns);
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my ($group, $owner, $algo, $size, $encrypted, $no_key, $comment);
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eval {
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local $SIG{__WARN__} = sub { push @optwarns, shift };
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$result = GetOptions(
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"group=s" => sub { $group //= $_[1] },
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"owner=s" => sub { $owner //= $_[1] },
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"algo=s" => sub { $algo //= $_[1] },
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"size=i" => sub { $size //= $_[1] },
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"encrypted" => sub { $encrypted //= $_[1] },
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"no-key" => sub { $no_key //= $_[1] },
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"comment=s" => sub { $comment //= $_[1] },
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);
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};
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if ($@) { die $@ }
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if (!$result) {
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local $" = ", ";
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HEXIT('ERR_BAD_OPTIONS', msg => "Error parsing options: @optwarns");
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}
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if (!$group || !$owner) {
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HEXIT('ERR_MISSING_PARAMETER', msg => "Missing argument 'group' or 'owner'");
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}
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if ($no_key && ($algo || $size || $encrypted)) {
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EXIT('ERR_INVALID_PARAMETER', msg => "Can't specify 'no-key' along with 'algo', 'size' or 'encrypted'");
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}
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if (!$no_key && (!$algo || !$size)) {
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HEXIT('ERR_MISSING_PARAMETER', msg => "Missing argument 'algo' or 'size'");
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}
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if ($comment) {
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if ($comment =~ /^([a-zA-Z0-9=_,-]+)$/) {
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$comment = $1; # untaint
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}
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else {
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HEXIT('ERR_INVALID_PARAMETER', msg => "Specified comment contains invalid characters");
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}
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}
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#<HEADER
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#>RIGHTSCHECK
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if ($self eq 'root') {
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osh_debug "Real root, skipping checks of permissions";
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}
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else {
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# need to perform another security check
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$fnret = OVH::Bastion::is_user_in_group(user => $self, group => "osh-groupCreate");
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if (!$fnret) {
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HEXIT('ERR_SECURITY_VIOLATION', msg => "You're not allowed to run this, dear $self");
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}
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}
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#<RIGHTSCHECK
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#>PARAMS:ACCOUNT
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osh_debug("Checking owner");
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$fnret = OVH::Bastion::is_bastion_account_valid_and_existing(account => $owner);
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$fnret or HEXIT($fnret);
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# get returned untainted value
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$owner = $fnret->value->{'account'};
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#<PARAMS:ACCOUNT
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#>PARAMS:GROUP
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osh_debug("checking group");
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$fnret = OVH::Bastion::is_valid_group(group => $group, groupType => "key");
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$fnret or HEXIT($fnret);
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# get returned untainted value
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$group = $fnret->value->{'group'};
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my $shortGroup = $fnret->value->{'shortGroup'};
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foreach my $test ($group, "$group-gatekeeper", "$group-owner") {
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$fnret = OVH::Bastion::is_group_existing(group => $test);
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$fnret->is_err and HEXIT($fnret);
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my (undef, $displayGroup) = $test =~ m/^(key)?(.+)/;
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$fnret->is_ok and HEXIT('KO_ALREADY_EXISTING', msg => "The group $displayGroup already exists");
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}
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$fnret = OVH::Bastion::is_account_existing(account => $group);
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$fnret->is_err and HEXIT($fnret);
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$fnret->is_ok and HEXIT('KO_ALREADY_EXISTING', msg => "The account $group already exists");
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#<PARAMS:GROUP
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#>PARAMS:ALGO/SIZE
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if (!$no_key) {
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$algo = lc($algo);
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$fnret = OVH::Bastion::is_allowed_algo_and_size(algo => $algo, size => $size, way => 'egress');
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$fnret or HEXIT($fnret);
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# if we're still here, it's valid, untaint those
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($algo) = $algo =~ m/(.+)/;
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($size) = $size =~ m/(.+)/;
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}
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#<PARAMS:ALGO/SIZE
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#>CODE
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my $passphrase = ''; # empty by default
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if ($encrypted) {
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print STDERR "Please enter a passphrase for the new group key (not echoed): ";
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ReadMode('noecho');
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chomp(my $pass1 = <STDIN>);
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if (length($pass1) < 5) {
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ReadMode('restore');
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HEXIT('ERR_PASSPHRASE_TOO_SMALL', msg => "Passphrase should have at least 5 chars");
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}
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print STDERR "\nPlease enter it again: ";
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chomp(my $pass2 = <STDIN>);
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print STDERR "\n";
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ReadMode('restore');
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if ($pass1 ne $pass2) {
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HEXIT('ERR_PASSPHRASE_MISMATCH', msg => "Passphrases don't match, please try again");
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}
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($passphrase) = $pass1 =~ /(.+)/; # untaint
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}
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# First create group
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osh_info("Creating groups");
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foreach my $tocreate ($group, "$group-aclkeeper", "$group-gatekeeper", "$group-owner") {
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$fnret = OVH::Bastion::sys_groupadd(group => $tocreate, noisy_stderr => 1);
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$fnret->err eq 'OK'
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or HEXIT('ERR_GROUPADD_FAILED', msg => "Error while running groupadd command for $tocreate (" . $fnret->msg . ")");
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}
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osh_debug("Creating directory");
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mkdir "/home/keykeeper/$group";
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chmod 0755, "/home/keykeeper/$group";
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osh_info("Creating user corresponding to group $shortGroup");
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# if a comment has been set, we'll store it as the user's GECOS corresponding to the group name
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# user is member of the group, cannot login and have no password
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$fnret = OVH::Bastion::sys_useradd(user => $group, gid => $group, shell => undef, comment => $comment, noisy_stderr => 1);
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$fnret->err eq 'OK'
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or HEXIT('ERR_USERADD_FAILED', msg => "Error while adding corresponding user of group $shortGroup (" . $fnret->msg . ")");
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# Building /home/$group
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OVH::Bastion::touch_file("/home/$group/allowed.ip");
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osh_info("Adjusting permissions...");
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my $bigX = (OVH::Bastion::is_linux() ? 'X' : 'x');
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foreach my $command (
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['chown', '-R', "$group:$group", "/home/$group"],
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['chgrp', "$group-aclkeeper", "/home/$group/allowed.ip"],
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['chmod', '-R', "o-rwx,g=r$bigX,u=rw$bigX", "/home/$group"],
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['chmod', '0664', "/home/$group/allowed.ip"],
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)
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{
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$fnret = OVH::Bastion::execute(cmd => $command, noisy_stderr => 1);
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$fnret->err eq 'OK'
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or HEXIT('ERR_CHMOD_FAILED', msg => "Error while running chmod to adjust permissions (" . $fnret->msg . ")");
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}
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chmod 0751, "/home/$group" if !OVH::Bastion::has_acls();
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foreach my $gr ("$group-owner", "$group-gatekeeper", "$group-aclkeeper", "osh-whoHasAccessTo", "osh-auditor") {
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OVH::Bastion::sys_setfacl(target => "/home/$group", perms => "g:$gr:x")
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or HEXIT('ERR_SETFACL_FAILED', msg => "Error setting ACLs on group homedir");
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}
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osh_debug("Adding allowkeeper to group $group");
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$fnret = OVH::Bastion::add_user_to_group(group => $group, user => 'allowkeeper', groupType => 'key');
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$fnret or HEXIT($fnret);
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osh_info("Adding $owner to owner, gatekeeper, aclkeeper and main groups of $shortGroup");
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# temporarily set ourselves owner manually so that we can add the wanted owner properly
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# as owner/gatekeeper/member then revoke our own right
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$fnret = OVH::Bastion::sys_addmembertogroup(group => "$group-owner", user => $self, noisy_stderr => 1);
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$fnret or HEXIT($fnret);
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# special case: if we're setting ourselves as owner, we must not remove
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# our own rights after granting
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my @todoList = (
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$owner eq $self
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? (
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{action => 'add', type => 'owner', account => $owner},
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{action => 'add', type => 'aclkeeper', account => $owner},
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{action => 'add', type => 'gatekeeper', account => $owner},
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{action => 'add', type => 'member', account => $owner},
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)
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: (
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{action => 'add', type => 'owner', account => $owner},
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{action => 'add', type => 'aclkeeper', account => $owner},
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{action => 'add', type => 'gatekeeper', account => $owner},
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{action => 'add', type => 'gatekeeper', account => $self},
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{action => 'add', type => 'member', account => $owner},
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{action => 'del', type => 'gatekeeper', account => $self},
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{action => 'del', type => 'owner', account => $self},
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)
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);
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foreach my $todo (@todoList) {
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$fnret = OVH::Bastion::Plugin::groupSetRole::act(
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self => $self,
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account => $todo->{'account'},
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group => $shortGroup,
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action => $todo->{'action'},
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type => $todo->{'type'},
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sudo => 1,
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silentoverride => 1
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);
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$fnret or HEXIT($fnret);
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}
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my $keykeeper_uid = (getpwnam('keykeeper'))[2];
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my $group_gid = (getgrnam($group))[2];
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chown $keykeeper_uid, $group_gid, "/home/keykeeper/$group";
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if (!$no_key) {
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osh_info("Generating main group key, this might take a few seconds...");
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$fnret = OVH::Bastion::generate_ssh_key(
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prefix => $shortGroup,
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folder => "/home/keykeeper/$group",
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size => $size,
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algo => $algo,
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passphrase => $passphrase,
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uid => $keykeeper_uid,
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gid => $group_gid,
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group_readable => 1
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);
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$fnret or HEXIT($fnret);
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}
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# allowed to sudo for the group
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osh_info("Configuring sudoers for this group");
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$fnret = OVH::Bastion::execute(cmd => [$OVH::Bastion::BASEPATH . '/bin/sudogen/generate-sudoers.sh', 'create', 'group', $group], must_succeed => 1, noisy_stdout => 1);
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$fnret or HEXIT('ERR_CANNOT_CREATE_SUDOERS', msg => "An error occurred while creating sudoers for this group");
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OVH::Bastion::syslogFormatted(
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severity => 'info',
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type => 'group',
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fields => [
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['action', 'create'],
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['group', $shortGroup],
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['owner', $owner],
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['egress_ssh_key_algorithm', $algo],
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['egress_ssh_key_size', $size],
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['egress_ssh_key_encrypted', ($encrypted ? 'true' : 'false')],
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]
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);
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# done at last!
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HEXIT('OK', value => {group => $shortGroup, owner => $owner});
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