'verbose' => \$verbose,
) or pod2usage(2);
+#
+# miscellaneous initialization functions
+#
+
+setPrivilegeSeparation(0);
+
#
# main execution. This should find its way into a subroutine at some future
# point.
print "Hi, I'm the setup script for the gsi_openssh package! I will create\n";
print "a number of configuration files based on your local system setup. I\n";
print "will also attempt to copy or create a number of SSH key pairs for\n";
-print "this machine.\n";
+print "this machine. (Loosely, if I find a pair of host keys in /etc/ssh,\n";
+print "I will copy them into \$GLOBUS_LOCATION/etc/ssh. Otherwise, I will\n";
+print "generate them for you.)\n";
print "\n";
-print "(Loosely, if I find a pair of host keys in /etc/ssh, I will copy them\n";
-print "into \$GLOBUS_LOCATION/etc/ssh. Otherwise, I will generate them for\n";
-print "you.)\n";
+print " Jacobim Mugatu says,\n";
+print " \"Utopian Prime Minister Bad! GSI-OpenSSH Good!\"\n";
print "\n";
if ( isForced() )
print " o I see that you have your GLOBUS_LOCATION environmental variable\n";
print " set to:\n";
print "\n";
-print " \t\"$gpath\"\n";
+print " \"$gpath\"\n";
print "\n";
print " Remember to keep this variable set (correctly) when you want to\n";
print " use the executables that came with this package.\n";
print "\n";
-print " After that you may run, e.g.:\n";
+print " After that you may execute, for example:\n";
print "\n";
-print " \t\$ . \$GLOBUS_LOCATION/etc/globus-user-env.sh\n";
+print " \$ . \$GLOBUS_LOCATION/etc/globus-user-env.sh\n";
print "\n";
print " to prepare your environment for running the gsi_openssh\n";
print " executables.\n";
+
+if ( !getPrivilegeSeparation() )
+{
+ print "\n";
+ print " o For System Administrators:\n";
+ print "\n";
+ print " If you are going to run the GSI-OpenSSH server, we recommend\n";
+ print " enabling privilege separation. Although this package supports\n";
+ print " this feature, your system appears to require some additional\n";
+ print " configuration.\n";
+ print "\n";
+ print " From the file README.privsep, included as a part of the OpenSSH\n";
+ print " distribution:\n";
+ print "\n";
+ print " When privsep is enabled, during the pre-authentication\n";
+ print " phase sshd will chroot(2) to \"/var/empty\" and change its\n";
+ print " privileges to the \"sshd\" user and its primary group. sshd\n";
+ print " is a pseudo-account that should not be used by other\n";
+ print " daemons, and must be locked and should contain a \"nologin\"\n";
+ print " or invalid shell.\n";
+ print "\n";
+ print " You should do something like the following to prepare the\n";
+ print " privsep preauth environment:\n";
+ print "\n";
+ print " \# mkdir /var/empty\n";
+ print " \# chown root:sys /var/empty\n";
+ print " \# chmod 755 /var/empty\n";
+ print " \# groupadd sshd\n";
+ print " \# useradd -g sshd -c 'sshd privsep' -d /var/empty \\\n";
+ print " -s /bin/false sshd\n";
+ print "\n";
+ print " /var/empty should not contain any files.\n";
+}
+
+print "\n";
+print " o For more information about GSI-Enabled OpenSSH, visit:\n";
+print " <http://www.ncsa.uiuc.edu/Divisions/ACES/GSI/openssh/>\n";
+
+#
+# give the user a chance to read all of this output
+#
+
print "\n";
-print " \"Utopian Prime Minister bad! GSI-OpenSSH *good*!\"\n";
-print " \t--( Jacobim Mugatu )--\n";
+print "Press <return> to continue... ";
+$trash = <STDIN>;
+
print "---------------------------------------------------------------------\n";
print "$myname: Finished configuring package 'gsi_openssh'.\n";
my($mode, $uid, $gid);
my($data);
- if ( isPresent("/dev/random") && !isForced() )
+ if ( isPresent("$sysconfdir/ssh_prng_cmds") && !isForced() )
{
- printf("/dev/random found and not forced. Not installing ssh_prng_cmds...\n");
+ printf("ssh_prng_cmds found and not forced. Not installing ssh_prng_cmds...\n");
return;
}
my($fileInput, $fileOutput);
my($mode, $uid, $gid);
my($line, $newline);
+ my($privsep_enabled);
print "Fixing paths in sshd_config...\n";
return;
}
+ #
+ # check to see whether we should enable privilege separation
+ #
+
+ if ( userExists("sshd") && ( -d "/var/empty" ) && ( getOwnerID("/var/empty") eq 0 ) )
+ {
+ setPrivilegeSeparation(1);
+ }
+ else
+ {
+ setPrivilegeSeparation(0);
+ }
+
+ if ( getPrivilegeSeparation() )
+ {
+ $privsep_enabled = "yes";
+ }
+ else
+ {
+ $privsep_enabled = "no";
+ }
+
#
# Grab the current mode/uid/gid for use later
#
# Open the files for reading and writing, and loop over the input's contents
#
- open(IN, "<$fileInput") || die ("$0: input file $fileInput missing!\n");
- open(OUT, ">$fileOutput") || die ("$0: unable to open output file $fileOutput!\n");
+ $data = readFile($fileInput);
- while (<IN>)
- {
- #
- # sorry for the whacky regex, but i need to verify a whole line
- #
+ #
+ # alter the PidFile config
+ #
- $line = $_;
- if ( $line =~ /^\s*Subsystem\s+sftp\s+\S+\s*$/ )
- {
- $line = "Subsystem\tsftp\t$gpath/libexec/sftp-server\n";
- $line =~ s:/+:/:g;
- }
- elsif ( $line =~ /^\s*PidFile.*$/ )
- {
- $line = "PidFile\t$gpath/var/sshd.pid\n";
- $line =~ s:/+:/:g;
- }
- else
- {
- # do nothing
- }
+ $text = "PidFile\t$gpath/var/sshd.pid";
+ $data =~ s:^[\s|#]*PidFile.*$:$text:gm;
- print OUT "$line";
- } # while <IN>
+ #
+ # set the sftp directive
+ #
- close(OUT);
- close(IN);
+ $text = "Subsystem\tsftp\t$gpath/libexec/sftp-server";
+ $data =~ s:^[\s|#]*Subsystem\s+sftp\s+.*$:$text:gm;
+
+ #
+ # set the privilege separation directive
+ #
+
+ $text = "UsePrivilegeSeparation\t${privsep_enabled}";
+ $data =~ s:^[\s|#]*UsePrivilegeSeparation.*$:$text:gm;
+
+ #
+ # dump the modified output to the config file
+ #
+
+ writeFile($fileOutput, $data);
#
# An attempt to revert the new file back to the original file's
return 0;
}
+### setPrivilegeSeparation( $value )
+#
+# set the privilege separation variable to $value
+#
+
+sub setPrivilegeSeparation
+{
+ my($value) = @_;
+
+ $privsep = $value;
+}
+
+### getPrivilegeSeparation( )
+#
+# return the value of the privilege separation variable
+#
+
+sub getPrivilegeSeparation
+{
+ return $privsep;
+}
+
### prepareFileWrite( $file )
#
# test $file to prepare for writing to it.
sub copySXXScript
{
my($in, $out) = @_;
+ my($tmpgpath);
if ( !isReadable($in) )
{
return;
}
+ #
+ # clean up any junk in the globus path variable
+ #
+
+ $tmpgpath = $gpath;
+ $tmpgpath =~ s:/+:/:g;
+ $tmpgpath =~ s:([^/]+)/$:\1:g;
+
+ #
+ # read in the script, substitute globus location, then write it back out
+ #
+
$data = readFile($in);
- $data =~ s|\@GLOBUS_LOCATION\@|$gpath|g;
+ $data =~ s|\@GLOBUS_LOCATION\@|$tmpgpath|g;
writeFile($out, $data);
action("chmod 755 $out");
}
$file = abs_path($file);
return $file;
}
+
+### getOwnerID( $file )
+#
+# return the uid containing the owner ID of the given file.
+#
+
+sub getOwnerID
+{
+ my($file) = @_;
+ my($uid);
+
+ #
+ # call stat() to get the mode of the file
+ #
+
+ $uid = (stat($file))[4];
+
+ return $uid;
+}
+
+### getMode( $file )
+#
+# return a string containing the mode of the given file.
+#
+
+sub getMode
+{
+ my($file) = @_;
+ my($tempmode, $mode);
+
+ #
+ # call stat() to get the mode of the file
+ #
+
+ $tempmode = (stat($file))[2];
+ if (length($tempmode) < 1)
+ {
+ return "";
+ }
+
+ #
+ # call sprintf to format the mode into a UNIX-like string
+ #
+
+ $mode = sprintf("%04o", $tempmode & 07777);
+
+ return $mode;
+}
+
+### userExists( $username )
+#
+# given a username, return true if the user exists on the system. return false
+# otherwise.
+#
+
+sub userExists
+{
+ my($username) = @_;
+ my($uid);
+
+ #
+ # retrieve the userid of the user with the given username
+ #
+
+ $uid = getpwnam($username);
+
+ #
+ # return true if $uid is defined and has a length greater than 0
+ #
+
+ if ( defined($uid) and (length($uid) > 0) )
+ {
+ return 1;
+ }
+ else
+ {
+ return 0;
+ }
+}
andersk / gssapi-openssh.git / blobdiff