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marsadm: critical safeguard uname vs hostname

This commit is contained in:
Thomas Schoebel-Theuer 2022-03-10 19:14:36 +01:00
parent eb6797fc32
commit 87b051d33d
1 changed files with 47 additions and 3 deletions
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50
userspace/marsadm
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@ -228,15 +228,59 @@ sub any_exists {
##################################################################
# CRITICAL: utsname & co
sub get_checked_utsname {
my $hostname;
my $etc_hostname = "/etc/hostname";
if (-s $etc_hostname) {
open(my $fh, "<", $etc_hostname)
or die "cannot open '$etc_hostname' althoough it appears to exist\n";
$hostname = <$fh>;
close($fh);
chomp $hostname;
} else {
$etc_hostname = "/bin/hostname";
unless (-x $etc_hostname) {
$etc_hostname = "/usr/bin/hostname";
}
$hostname = `$etc_hostname`;
chomp $hostname;
}
unless ($hostname) {
die "CRITICAL RISK: cannot determine hostname from $etc_hostname\n";
}
my $uname_cmd = "/bin/uname";
unless (-x $uname_cmd) {
$uname_cmd = "/usr/bin/uname";
}
my $uname = `$uname_cmd -n`;
chomp $uname;
unless ($uname) {
die "CRITICAL RISK: cannot determine network node name via 'uname -n'\n";
}
if ($uname ne $hostname) {
die "CRITICAL RISK: the utsname from 'uname -n' is '$uname', DIFFERING from $etc_hostname '$hostname'\n";
}
if ($uname =~ m/\./) {
warn "CRITICAL RISK: your hostname is MISCONFIGURED, thus you are risiking DATA DESTRUCTION.\n";
warn "CRITICAL RISK: do not mix up hostnames and domainnames.\n";
warn "CRITICAL RISK: read mars-user-guide.pdf\n";
die "CRITICAL RISK: your hostname / uname / utsname MUST NOT contain a '.' symbol!\n";
}
check_id($uname);
return $uname;
}
##################################################################
# global variables
my $Id = '$Id$ ';
my $user_version = 0.1;
my $marsadm_version = 2.9; # some rough hint at newer features
my $mars = "/mars";
my $host = `uname -n` or ldie "cannot determine my network node name\n";
chomp $host;
check_id($host);
my $host = get_checked_utsname();
my $real_host = $host;
my $backup_dir = "$mars/backups-" . time();
my $force = 0;