--- loncom/lond	2015/03/12 00:37:30	1.489.2.17
+++ loncom/lond	2022/02/07 12:12:07	1.489.2.43.2.2
@@ -2,7 +2,7 @@
 # The LearningOnline Network
 # lond "LON Daemon" Server (port "LOND" 5663)
 #
-# $Id: lond,v 1.489.2.17 2015/03/12 00:37:30 raeburn Exp $
+# $Id: lond,v 1.489.2.43.2.2 2022/02/07 12:12:07 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -15,7 +15,6 @@
 #
 # LON-CAPA 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.
 #
@@ -55,13 +54,16 @@ use LONCAPA::lonssl;
 use Fcntl qw(:flock);
 use Apache::lonnet;
 use Mail::Send;
+use Crypt::Eksblowfish::Bcrypt;
+use Digest::SHA;
+use Encode;
 
 my $DEBUG = 0;		       # Non zero to enable debug log entries.
 
 my $status='';
 my $lastlog='';
 
-my $VERSION='$Revision: 1.489.2.17 $'; #' stupid emacs
+my $VERSION='$Revision: 1.489.2.43.2.2 $'; #' stupid emacs
 my $remoteVERSION;
 my $currenthostid="default";
 my $currentdomainid;
@@ -1422,6 +1424,22 @@ sub du2_handler {
 #    selected directory the filename followed by the full output of
 #    the stat function is returned.  The returned info for each
 #    file are separated by ':'.  The stat fields are separated by &'s.
+#
+#    If the requested path contains /../ or is:
+#
+#    1. for a directory, and the path does not begin with one of:
+#        (a) /home/httpd/html/res/<domain>
+#        (b) /home/httpd/html/userfiles/
+#        (c) /home/httpd/lonUsers/<domain>/<1>/<2>/<3>/<username>/userfiles
+#    or is:
+#
+#    2. for a file, and the path (after prepending) does not begin with one of:
+#        (a) /home/httpd/lonUsers/<domain>/<1>/<2>/<3>/<username>/
+#        (b) /home/httpd/html/res/<domain>/<username>/
+#        (c) /home/httpd/html/userfiles/<domain>/<username>/
+#
+#    the response will be "refused".
+#
 # Parameters:
 #    $cmd        - The command that dispatched us (ls).
 #    $ulsdir     - The directory path to list... I'm not sure what this
@@ -1443,8 +1461,17 @@ sub ls_handler {
     my $rights;
     my $ulsout='';
     my $ulsfn;
+    if ($ulsdir =~m{/\.\./}) {
+        &Failure($client,"refused\n",$userinput);
+        return 1;
+    }
     if (-e $ulsdir) {
 	if(-d $ulsdir) {
+            unless (($ulsdir =~ m{^/home/httpd/html/(res/$LONCAPA::match_domain|userfiles/)}) ||
+                    ($ulsdir =~ m{^/home/httpd/lonUsers/$LONCAPA::match_domain(?:/[\w\-.@]){3}/$LONCAPA::match_name/userfiles})) {
+                &Failure($client,"refused\n",$userinput);
+                return 1;
+            }
 	    if (opendir(LSDIR,$ulsdir)) {
 		while ($ulsfn=readdir(LSDIR)) {
 		    undef($obs);
@@ -1468,6 +1495,11 @@ sub ls_handler {
 		closedir(LSDIR);
 	    }
 	} else {
+            unless (($ulsdir =~ m{^/home/httpd/lonUsers/$LONCAPA::match_domain(?:/[\w\-.@]){3}/$LONCAPA::match_name/}) ||
+                    ($ulsdir =~ m{^/home/httpd/html/(?:res|userfiles)/$LONCAPA::match_domain/$LONCAPA::match_name/})) { 
+                &Failure($client,"refused\n",$userinput);
+                return 1;
+            }
 	    my @ulsstats=stat($ulsdir);
 	    $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';
 	}
@@ -1492,6 +1524,22 @@ sub ls_handler {
 #    selected directory the filename followed by the full output of
 #    the stat function is returned.  The returned info for each
 #    file are separated by ':'.  The stat fields are separated by &'s.
+#
+#    If the requested path contains /../ or is:
+#
+#    1. for a directory, and the path does not begin with one of:
+#        (a) /home/httpd/html/res/<domain>
+#        (b) /home/httpd/html/userfiles/
+#        (c) /home/httpd/lonUsers/<domain>/<1>/<2>/<3>/<username>/userfiles
+#    or is:
+#
+#    2. for a file, and the path (after prepending) does not begin with one of:
+#        (a) /home/httpd/lonUsers/<domain>/<1>/<2>/<3>/<username>/
+#        (b) /home/httpd/html/res/<domain>/<username>/
+#        (c) /home/httpd/html/userfiles/<domain>/<username>/
+#
+#    the response will be "refused".
+#
 # Parameters:
 #    $cmd        - The command that dispatched us (ls).
 #    $ulsdir     - The directory path to list... I'm not sure what this
@@ -1512,8 +1560,17 @@ sub ls2_handler {
     my $rights;
     my $ulsout='';
     my $ulsfn;
+    if ($ulsdir =~m{/\.\./}) {
+        &Failure($client,"refused\n",$userinput);
+        return 1;
+    }
     if (-e $ulsdir) {
         if(-d $ulsdir) {
+            unless (($ulsdir =~ m{^/home/httpd/html/(res/$LONCAPA::match_domain|userfiles/)}) ||
+                    ($ulsdir =~ m{^/home/httpd/lonUsers/$LONCAPA::match_domain(?:/[\w\-.@]){3}/$LONCAPA::match_name/userfiles})) {
+                &Failure($client,"refused\n","$userinput");
+                return 1;
+            }
             if (opendir(LSDIR,$ulsdir)) {
                 while ($ulsfn=readdir(LSDIR)) {
                     undef($obs);
@@ -1538,6 +1595,11 @@ sub ls2_handler {
                 closedir(LSDIR);
             }
         } else {
+            unless (($ulsdir =~ m{^/home/httpd/lonUsers/$LONCAPA::match_domain(?:/[\w\-.@]){3}/$LONCAPA::match_name/}) ||
+                    ($ulsdir =~ m{^/home/httpd/html/(?:res|userfiles)/$LONCAPA::match_domain/$LONCAPA::match_name/})) {
+                &Failure($client,"refused\n",$userinput);
+                return 1;
+            }
             my @ulsstats=stat($ulsdir);
             $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';
         }
@@ -1554,6 +1616,25 @@ sub ls2_handler {
 #    selected directory the filename followed by the full output of
 #    the stat function is returned.  The returned info for each
 #    file are separated by ':'.  The stat fields are separated by &'s.
+#
+#    If the requested path (after prepending) contains /../ or is:
+#
+#    1. for a directory, and the path does not begin with one of:
+#        (a) /home/httpd/html/res/<domain>
+#        (b) /home/httpd/html/userfiles/
+#        (c) /home/httpd/lonUsers/<domain>/<1>/<2>/<3>/<username>/userfiles
+#        (d) /home/httpd/html/priv/<domain> and client is the homeserver
+#
+#    or is:
+#
+#    2. for a file, and the path (after prepending) does not begin with one of:
+#        (a) /home/httpd/lonUsers/<domain>/<1>/<2>/<3>/<username>/
+#        (b) /home/httpd/html/res/<domain>/<username>/
+#        (c) /home/httpd/html/userfiles/<domain>/<username>/
+#        (d) /home/httpd/html/priv/<domain>/<username>/ and client is the homeserver
+#
+#    the response will be "refused".
+#
 # Parameters:
 #    $cmd        - The command that dispatched us (ls).
 #    $tail       - The tail of the request that invoked us.
@@ -1593,22 +1674,12 @@ sub ls3_handler {
     }
 
     my $dir_root = $perlvar{'lonDocRoot'};
-    if ($getpropath) {
+    if (($getpropath) || ($getuserdir)) {
         if (($uname =~ /^$LONCAPA::match_name$/) && ($udom =~ /^$LONCAPA::match_domain$/)) {
             $dir_root = &propath($udom,$uname);
             $dir_root =~ s/\/$//;
         } else {
-            &Failure($client,"refused\n","$cmd:$tail");
-            return 1;
-        }
-    } elsif ($getuserdir) {
-        if (($uname =~ /^$LONCAPA::match_name$/) && ($udom =~ /^$LONCAPA::match_domain$/)) {
-            my $subdir=$uname.'__';
-            $subdir =~ s/(.)(.)(.).*/$1\/$2\/$3/;
-            $dir_root = $Apache::lonnet::perlvar{'lonUsersDir'}
-                       ."/$udom/$subdir/$uname";
-        } else {
-            &Failure($client,"refused\n","$cmd:$tail");
+            &Failure($client,"refused\n",$userinput);
             return 1;
         }
     } elsif ($alternate_root ne '') {
@@ -1621,12 +1692,28 @@ sub ls3_handler {
             $ulsdir = $dir_root.'/'.$ulsdir;
         }
     }
+    if ($ulsdir =~m{/\.\./}) {
+        &Failure($client,"refused\n",$userinput);
+        return 1;
+    }
+    my $islocal;
+    my @machine_ids = &Apache::lonnet::current_machine_ids();
+    if (grep(/^\Q$clientname\E$/,@machine_ids)) {
+        $islocal = 1;
+    }
     my $obs;
     my $rights;
     my $ulsout='';
     my $ulsfn;
     if (-e $ulsdir) {
         if(-d $ulsdir) {
+            unless (($getpropath) || ($getuserdir) ||
+                    ($ulsdir =~ m{^/home/httpd/html/(res/$LONCAPA::match_domain|userfiles/)}) ||
+                    ($ulsdir =~ m{^/home/httpd/lonUsers/$LONCAPA::match_domain(?:/[\w\-.@]){3}/$LONCAPA::match_name/userfiles}) ||
+                    (($ulsdir =~ m{^/home/httpd/html/priv/$LONCAPA::match_domain}) && ($islocal))) {
+                &Failure($client,"refused\n",$userinput);
+                return 1;
+            }
             if (opendir(LSDIR,$ulsdir)) {
                 while ($ulsfn=readdir(LSDIR)) {
                     undef($obs);
@@ -1651,6 +1738,13 @@ sub ls3_handler {
                 closedir(LSDIR);
             }
         } else {
+            unless (($getpropath) || ($getuserdir) ||
+                    ($ulsdir =~ m{^/home/httpd/lonUsers/$LONCAPA::match_domain(?:/[\w\-.@]){3}/$LONCAPA::match_name/}) ||
+                    ($ulsdir =~ m{^/home/httpd/html/(?:res|userfiles)/$LONCAPA::match_domain/$LONCAPA::match_name/}) ||
+                    (($ulsdir =~ m{^/home/httpd/html/priv/$LONCAPA::match_domain/$LONCAPA::match_name/}) && ($islocal))) {
+                &Failure($client,"refused\n",$userinput);
+                return 1;
+            }
             my @ulsstats=stat($ulsdir);
             $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';
         }
@@ -1701,7 +1795,7 @@ sub read_lonnet_global {
                 }
                 if ($what eq 'perlvar') {
                     if (!exists($packagevars{$what}{'lonBalancer'})) {
-                        if ($dist =~ /^(centos|rhes|fedora|scientific)/) {
+                        if ($dist =~ /^(centos|rhes|fedora|scientific|oracle|rocky|alma)/) {
                             my $othervarref=LONCAPA::Configuration::read_conf('httpd.conf');
                             if (ref($othervarref) eq 'HASH') {
                                 $items->{'lonBalancer'} = $othervarref->{'lonBalancer'};
@@ -1926,7 +2020,7 @@ sub authenticate_handler {
                 my ($remote,$hosted);
                 my $remotesession = &get_usersession_config($udom,'remotesession');
                 if (ref($remotesession) eq 'HASH') {
-                    $remote = $remotesession->{'remote'}
+                    $remote = $remotesession->{'remote'};
                 }
                 my $hostedsession = &get_usersession_config($clienthomedom,'hostedsession');
                 if (ref($hostedsession) eq 'HASH') {
@@ -2013,19 +2107,90 @@ sub change_password_handler {
     }
     if($validated) {
 	my $realpasswd  = &get_auth_type($udom, $uname); # Defined since authd.
-	
 	my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
+        my $notunique;
 	if ($howpwd eq 'internal') {
 	    &Debug("internal auth");
-	    my $salt=time;
-	    $salt=substr($salt,6,2);
-	    my $ncpass=crypt($npass,$salt);
-	    if(&rewrite_password_file($udom, $uname, "internal:$ncpass")) {
+            my $ncpass = &hash_passwd($udom,$npass);
+            my (undef,$method,@rest) = split(/!/,$contentpwd);
+            if ($method eq 'bcrypt') {
+                my %passwdconf = &Apache::lonnet::get_passwdconf($udom);
+                if (($passwdconf{'numsaved'}) && ($passwdconf{'numsaved'} =~ /^\d+$/)) {
+                    my @oldpasswds;
+                    my $userpath = &propath($udom,$uname);
+                    my $fullpath = $userpath.'/oldpasswds';
+                    if (-d $userpath) {
+                        my @oldfiles;
+                        if (-e $fullpath) {
+                            if (opendir(my $dir,$fullpath)) {
+                                (@oldfiles) = grep(/^\d+$/,readdir($dir));
+                                closedir($dir);
+                            }
+                            if (@oldfiles) {
+                                @oldfiles = sort { $b <=> $a } (@oldfiles);
+                                my $numremoved = 0;
+                                for (my $i=0; $i<@oldfiles; $i++) {
+                                    if ($i>=$passwdconf{'numsaved'}) {
+                                        if (-f "$fullpath/$oldfiles[$i]") {
+                                            if (unlink("$fullpath/$oldfiles[$i]")) {
+                                                $numremoved ++;
+                                            }
+                                        }
+                                    } elsif (open(my $fh,'<',"$fullpath/$oldfiles[$i]")) {
+                                        while (my $line = <$fh>) {
+                                            push(@oldpasswds,$line);
+                                        }
+                                        close($fh);
+                                    }
+                                }
+                                if ($numremoved) {
+                                    &logthis("unlinked $numremoved old password files for $uname:$udom");
+                                }
+                            }
+                        }
+                        push(@oldpasswds,$contentpwd);
+                        foreach my $item (@oldpasswds) {
+                            my (undef,$method,@rest) = split(/!/,$item);
+                            if ($method eq 'bcrypt') {
+                                my $result = &hash_passwd($udom,$npass,@rest);
+                                if ($result eq $item) {
+                                    $notunique = 1;
+                                    last;
+                                }
+                            }
+                        }
+                        unless ($notunique) {
+                            unless (-e $fullpath) {
+                                if (&mkpath("$fullpath/")) {
+                                    chmod(0700,$fullpath);
+                                }
+                            }
+                            if (-d $fullpath) {
+                                my $now = time;
+                                if (open(my $fh,'>',"$fullpath/$now")) {
+                                    print $fh $contentpwd;
+                                    close($fh);
+                                    chmod(0400,"$fullpath/$now");
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+            if ($notunique) {
+                my $msg="Result of password change for $uname:$udom - password matches one used before";
+                if ($lonhost) {
+                    $msg .= " - request originated from: $lonhost";
+                }
+                &logthis($msg);
+                &Reply($client, "prioruse\n", $userinput);
+	    } elsif (&rewrite_password_file($udom, $uname, "internal:$ncpass")) {
 		my $msg="Result of password change for $uname: pwchange_success";
                 if ($lonhost) {
                     $msg .= " - request originated from: $lonhost";
                 }
                 &logthis($msg);
+                &update_passwd_history($uname,$udom,$howpwd,$context);
 		&Reply($client, "ok\n", $userinput);
 	    } else {
 		&logthis("Unable to open $uname passwd "               
@@ -2034,6 +2199,9 @@ sub change_password_handler {
 	    }
 	} elsif ($howpwd eq 'unix' && $context ne 'reset_by_email') {
 	    my $result = &change_unix_password($uname, $npass);
+            if ($result eq 'ok') {
+                &update_passwd_history($uname,$udom,$howpwd,$context);
+            }
 	    &logthis("Result of password change for $uname: ".
 		     $result);
 	    &Reply($client, \$result, $userinput);
@@ -2044,7 +2212,6 @@ sub change_password_handler {
 	    #
 	    &Failure( $client, "auth_mode_error\n", $userinput);
 	}  
-	
     } else {
 	if ($failure eq '') {
 	    $failure = 'non_authorized';
@@ -2056,6 +2223,38 @@ sub change_password_handler {
 }
 &register_handler("passwd", \&change_password_handler, 1, 1, 0);
 
+sub hash_passwd {
+    my ($domain,$plainpass,@rest) = @_;
+    my ($salt,$cost);
+    if (@rest) {
+        $cost = $rest[0];
+        # salt is first 22 characters, base-64 encoded by bcrypt
+        my $plainsalt = substr($rest[1],0,22);
+        $salt = Crypt::Eksblowfish::Bcrypt::de_base64($plainsalt);
+    } else {
+        my %domdefaults = &Apache::lonnet::get_domain_defaults($domain);
+        my $defaultcost = $domdefaults{'intauth_cost'};
+        if (($defaultcost eq '') || ($defaultcost =~ /D/)) {
+            $cost = 10;
+        } else {
+            $cost = $defaultcost;
+        }
+        # Generate random 16-octet base64 salt
+        $salt = "";
+        $salt .= pack("C", int rand(256)) for 1..16;
+    }
+    my $hash = &Crypt::Eksblowfish::Bcrypt::bcrypt_hash({
+        key_nul => 1,
+        cost    => $cost,
+        salt    => $salt,
+    }, Digest::SHA::sha512(Encode::encode('UTF-8',$plainpass)));
+
+    my $result = join("!", "", "bcrypt", sprintf("%02d",$cost),
+                &Crypt::Eksblowfish::Bcrypt::en_base64($salt).
+                &Crypt::Eksblowfish::Bcrypt::en_base64($hash));
+    return $result;
+}
+
 #
 #   Create a new user.  User in this case means a lon-capa user.
 #   The user must either already exist in some authentication realm
@@ -2099,7 +2298,8 @@ sub add_user_handler {
 		    ."makeuser";
 	    }
 	    unless ($fperror) {
-		my $result=&make_passwd_file($uname,$udom,$umode,$npass, $passfilename);
+		my $result=&make_passwd_file($uname,$udom,$umode,$npass,
+                                             $passfilename,'makeuser');
 		&Reply($client,\$result, $userinput);     #BUGBUG - could be fail
 	    } else {
 		&Failure($client, \$fperror, $userinput);
@@ -2168,12 +2368,14 @@ sub change_authentication_handler {
 		my $result = &change_unix_password($uname, $npass);
 		&logthis("Result of password change for $uname: ".$result);
 		if ($result eq "ok") {
+                    &update_passwd_history($uname,$udom,$umode,'changeuserauth');
 		    &Reply($client, \$result);
 		} else {
 		    &Failure($client, \$result);
 		}
 	    } else {
-		my $result=&make_passwd_file($uname,$udom,$umode,$npass,$passfilename);
+		my $result=&make_passwd_file($uname,$udom,$umode,$npass,
+                                             $passfilename,'changeuserauth');
 		#
 		#  If the current auth mode is internal, and the old auth mode was
 		#  unix, or krb*,  and the user is an author for this domain,
@@ -2194,6 +2396,17 @@ sub change_authentication_handler {
 }
 &register_handler("changeuserauth", \&change_authentication_handler, 1,1, 0);
 
+sub update_passwd_history {
+    my ($uname,$udom,$umode,$context) = @_;
+    my $proname=&propath($udom,$uname);
+    my $now = time;
+    if (open(my $fh,">>$proname/passwd.log")) {
+        print $fh "$now:$umode:$context\n";
+        close($fh);
+    }
+    return;
+}
+
 #
 #   Determines if this is the home server for a user.  The home server
 #   for a user will have his/her lon-capa passwd file.  Therefore all we need
@@ -2286,8 +2499,12 @@ sub update_resource_handler {
 		}
 		alarm(0);
 		if ($response->is_error()) {
-# FIXME: we should probably clean up here instead of just whine
-		    unlink($transname);
+                    my $reply=&Apache::lonnet::reply("unsub:$fname","$clientname");
+                    &devalidate_meta_cache($fname);
+                    if (-e $transname) {
+                        unlink($transname);
+                    }
+                    unlink($fname);
 		    my $message=$response->status_line;
 		    &logthis("LWP GET: $message for $fname ($remoteurl)");
 		} else {
@@ -2445,11 +2662,20 @@ sub remove_user_file_handler {
 	    if (-e $file) {
 		#
 		#   If the file is a regular file unlink is fine...
-		#   However it's possible the client wants a dir.
-		#   removed, in which case rmdir is more approprate:
+		#   However it's possible the client wants a dir
+		#   removed, in which case rmdir is more appropriate
+	        #   Note: rmdir will only remove an empty directory.
 		#
 	        if (-f $file){
 		    unlink($file);
+                    # for html files remove the associated .bak file
+                    # which may have been created by the editor.
+                    if ($ufile =~ m{^((docs|supplemental)/(?:\d+|default)/\d+(?:|/.+)/)[^/]+\.x?html?$}i) {
+                        my $path = $1;
+                        if (-e $file.'.bak') {
+                            unlink($file.'.bak');
+                        }
+                    }
 		} elsif(-d $file) {
 		    rmdir($file);
 		}
@@ -3067,7 +3293,8 @@ sub get_profile_entry {
 #
 #  Parameters:
 #     $cmd               - Command keyword of request (eget).
-#     $tail              - Tail of the command.  See GetProfileEntry
#                          for more information about this.
+#     $tail              - Tail of the command.  See GetProfileEntry
+#                          for more information about this.
 #     $client            - File open on the client.
 #  Returns:
 #     1      - Continue processing
@@ -3309,6 +3536,47 @@ sub dump_with_regexp {
 }
 &register_handler("dump", \&dump_with_regexp, 0, 1, 0);
 
+#
+#  Process the encrypted dump request. Original call should
+#  be from lonnet::dump() with seventh arg ($encrypt) set to
+#  1, to ensure that both request and response are encrypted.
+#
+#  Parameters:
+#     $cmd               - Command keyword of request (edump).
+#     $tail              - Tail of the command.
+#                          See &dump_with_regexp for more
+#                          information about this.
+#     $client            - File open on the client.
+#  Returns:
+#     1      - Continue processing
+#     0      - server should exit.
+#
+
+sub encrypted_dump_with_regexp {
+    my ($cmd, $tail, $client) = @_;
+    my $res = LONCAPA::Lond::dump_with_regexp($tail, $clientversion);
+
+    if ($res =~ /^error:/) {
+        Failure($client, \$res, "$cmd:$tail");
+    } else {
+        if ($cipher) {
+            my $cmdlength=length($res);
+            $res.="         ";
+            my $encres='';
+            for (my $encidx=0;$encidx<=$cmdlength;$encidx+=8) {
+                $encres.= unpack("H16",
+                                 $cipher->encrypt(substr($res,
+                                                         $encidx,
+                                                         8)));
+            }
+            &Reply( $client,"enc:$cmdlength:$encres\n","$cmd:$tail");
+        } else {
+            &Failure( $client, "error:no_key\n","$cmd:$tail");
+        }
+    }
+}
+&register_handler("edump", \&encrypted_dump_with_regexp, 0, 1, 0);
+
 #  Store a set of key=value pairs associated with a versioned name.
 #
 #  Parameters:
@@ -3649,6 +3917,37 @@ sub send_query_handler {
 
     my ($query,$arg1,$arg2,$arg3)=split(/\:/,$tail);
     $query=~s/\n*$//g;
+    if (($query eq 'usersearch') || ($query eq 'instdirsearch')) {
+        my $usersearchconf = &get_usersearch_config($currentdomainid,'directorysrch');
+        my $earlyout;
+        if (ref($usersearchconf) eq 'HASH') {
+            if ($currentdomainid eq $clienthomedom) {
+                if ($query eq 'usersearch') {
+                    if ($usersearchconf->{'lcavailable'} eq '0') {
+                        $earlyout = 1;
+                    }
+                } else {
+                    if ($usersearchconf->{'available'} eq '0') {
+                        $earlyout = 1;
+                    }
+                }
+            } else {
+                if ($query eq 'usersearch') {
+                    if ($usersearchconf->{'lclocalonly'}) {
+                        $earlyout = 1;
+                    }
+                } else {
+                    if ($usersearchconf->{'localonly'}) {
+                        $earlyout = 1;
+                    }
+                }
+            }
+        }
+        if ($earlyout) {
+            &Reply($client, "query_not_authorized\n");
+            return 1;
+        }
+    }
     &Reply($client, "". &sql_reply("$clientname\&$query".
 				"\&$arg1"."\&$arg2"."\&$arg3")."\n",
 	  $userinput);
@@ -4318,6 +4617,44 @@ sub course_lastaccess_handler {
 }
 &register_handler("courselastaccess",\&course_lastaccess_handler, 0, 1, 0);
 
+sub course_sessions_handler {
+    my ($cmd, $tail, $client) = @_;
+    my $userinput = "$cmd:$tail";
+    my ($cdom,$cnum,$lastactivity) = split(':',$tail);
+    my $dbsuffix = '_'.$cdom.'_'.$cnum.'.db';
+    my (%sessions,$qresult);
+    my $now=time;
+    if (opendir(DIR,$perlvar{'lonIDsDir'})) {
+        my $filename;
+        while ($filename=readdir(DIR)) {
+            next if ($filename=~/^\./);
+            next if ($filename=~/^publicuser_/);
+            next if ($filename=~/^[a-f0-9]+_(linked|lti_\d+)\.id$/);
+            if ($filename =~ /^($LONCAPA::match_username)_\d+_($LONCAPA::match_domain)_/) {
+                my ($uname,$udom) = ($1,$2);
+                next unless (-e "$perlvar{'lonDaemons'}/tmp/$uname$dbsuffix");
+                my $mtime = (stat("$perlvar{'lonIDsDir'}/$filename"))[9];
+                if ($lastactivity < 0) {
+                    next if ($mtime-$now > $lastactivity);
+                } else {
+                    next if ($now-$mtime > $lastactivity);
+                }
+                $sessions{$uname.':'.$udom} = $mtime;
+            }
+        }
+        closedir(DIR);
+    }
+    foreach my $user (keys(%sessions)) {
+        $qresult.=&escape($user).'='.$sessions{$user}.'&';
+    }
+    if ($qresult) {
+        chop($qresult);
+    }
+    &Reply($client, \$qresult, $userinput);
+    return 1;
+}
+&register_handler("coursesessions",\&course_sessions_handler, 0, 1, 0);
+
 #
 # Puts an unencrypted entry in a namespace db file at the domain level 
 #
@@ -4366,7 +4703,7 @@ sub put_domain_handler {
 # domain directory.
 #
 # Parameters:
-#   $cmd             - Command request keyword (get).
+#   $cmd             - Command request keyword (getdom).
 #   $tail            - Tail of the command.  This is a colon separated list
 #                      consisting of the domain and the 'namespace' 
 #                      which selects the gdbm file to do the lookup in,
@@ -4383,34 +4720,117 @@ sub put_domain_handler {
 sub get_domain_handler {
     my ($cmd, $tail, $client) = @_;
 
-
-    my $userinput = "$client:$tail";
+    my $userinput = "$cmd:$tail";
 
     my ($udom,$namespace,$what)=split(/:/,$tail,3);
-    chomp($what);
-    my @queries=split(/\&/,$what);
-    my $qresult='';
-    my $hashref = &tie_domain_hash($udom, "$namespace", &GDBM_READER());
-    if ($hashref) {
-        for (my $i=0;$i<=$#queries;$i++) {
-            $qresult.="$hashref->{$queries[$i]}&";
-        }
-        if (&untie_domain_hash($hashref)) {
-            $qresult=~s/\&$//;
-            &Reply($client, \$qresult, $userinput);
+    if ($namespace =~ /^enc/) {
+        &Failure( $client, "refused\n", $userinput);
+    } else {
+        my $res = LONCAPA::Lond::get_dom($userinput);
+        if ($res =~ /^error:/) {
+            &Failure($client, \$res, $userinput);
         } else {
-            &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
-                      "while attempting getdom\n",$userinput);
+            &Reply($client, \$res, $userinput);
         }
-    } else {
-        &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
-                 "while attempting getdom\n",$userinput);
     }
 
     return 1;
 }
 &register_handler("getdom", \&get_domain_handler, 0, 1, 0);
 
+sub encrypted_get_domain_handler {
+    my ($cmd, $tail, $client) = @_;
+
+    my $userinput = "$cmd:$tail";
+
+    my $res = LONCAPA::Lond::get_dom($userinput);
+    if ($res =~ /^error:/) {
+        &Failure($client, \$res, $userinput);
+    } else {
+        if ($cipher) {
+            my $cmdlength=length($res);
+            $res.="         ";
+            my $encres='';
+            for (my $encidx=0;$encidx<=$cmdlength;$encidx+=8) {
+                $encres.= unpack("H16",
+                                 $cipher->encrypt(substr($res,
+                                                         $encidx,
+                                                         8)));
+            }
+            &Reply( $client,"enc:$cmdlength:$encres\n",$userinput);
+        } else {
+            &Failure( $client, "error:no_key\n",$userinput);
+        }
+    }
+    return 1;
+}
+&register_handler("egetdom", \&encrypted_get_domain_handler, 1, 1, 0);
+
+#
+# Encrypted get from the namespace database file at the domain level.
+# This function retrieves a keyed item from a specific named database in the
+# domain directory.
+#
+# Parameters:
+#   $cmd             - Command request keyword (lti).
+#   $tail            - Tail of the command.  This is a colon-separated list
+#                      consisting of the domain, coursenum, if for LTI-
+#                      enabled deep-linking to course content using
+#                      link protection configured within a course,
+#                      context (=deeplink) if for LTI-enabled deep-linking
+#                      to course content using LTI Provider settings
+#                      configured within a course's domain, the (escaped)
+#                      launch URL, the (escaped) method (typically POST),
+#                      and a frozen hash of the LTI launch parameters
+#                      from the LTI payload.
+#   $client          - File descriptor open on the client.
+# Returns:
+#   1       - Continue processing.
+#   0       - Exit.
+#  Side effects:
+#     The reply will contain an LTI itemID, if the signed LTI payload
+#     could be verified using the consumer key and the shared secret
+#     available for that key (for the itemID) for either the course or domain,
+#     depending on values for cnum and context. The reply is encrypted before
+#     being written to $client.
+#
+sub lti_handler {
+    my ($cmd, $tail, $client) = @_;
+
+    my $userinput = "$cmd:$tail";
+
+    my ($cdom,$cnum,$context,$escurl,$escmethod,$items) = split(/:/,$tail);
+    my $url = &unescape($escurl);
+    my $method = &unescape($escmethod);
+    my $params = &Apache::lonnet::thaw_unescape($items);
+    my $res;
+    if ($cnum ne '') {
+        $res = &LONCAPA::Lond::crslti_itemid($cdom,$cnum,$url,$method,$params,$perlvar{'lonVersion'});
+    } else {
+        $res = &LONCAPA::Lond::domlti_itemid($cdom,$context,$url,$method,$params,$perlvar{'lonVersion'});
+    }
+    if ($res =~ /^error:/) {
+        &Failure($client, \$res, $userinput);
+    } else {
+        if ($cipher) {
+            my $cmdlength=length($res);
+            $res.="         ";
+            my $encres='';
+            for (my $encidx=0;$encidx<=$cmdlength;$encidx+=8) {
+                $encres.= unpack("H16",
+                                 $cipher->encrypt(substr($res,
+                                                         $encidx,
+                                                         8)));
+            }
+            &Reply( $client,"enc:$cmdlength:$encres\n",$userinput);
+        } else {
+            &Failure( $client, "error:no_key\n",$userinput);
+        }
+    }
+    return 1;
+}
+&register_handler("lti", \&lti_handler, 1, 1, 0);
+
 #
 #  Puts an id to a domains id database. 
 #
@@ -4836,15 +5256,23 @@ sub tmp_put_handler {
     }
     my ($id,$store);
     $tmpsnum++;
-    if (($context eq 'resetpw') || ($context eq 'createaccount')) {
-        $id = &md5_hex(&md5_hex(time.{}.rand().$$));
+    my $numtries = 0;
+    my $execdir=$perlvar{'lonDaemons'};
+    if (($context eq 'resetpw') || ($context eq 'createaccount') ||
+        ($context eq 'sso') || ($context eq 'link') || ($context eq 'retry')) {
+        $id = &md5_hex(&md5_hex(time.{}.rand().$$.$tmpsnum));
+        while ((-e "$execdir/tmp/$id.tmp") && ($numtries <10)) {
+            undef($id);
+            $id = &md5_hex(&md5_hex(time.{}.rand().$$.$tmpsnum));
+            $numtries ++;
+        }
     } else {
         $id = $$.'_'.$clientip.'_'.$tmpsnum;
     }
     $id=~s/\W/\_/g;
     $record=~s/\n//g;
-    my $execdir=$perlvar{'lonDaemons'};
-    if ($store=IO::File->new(">$execdir/tmp/$id.tmp")) {
+    if (($id ne '') &&
+        ($store=IO::File->new(">$execdir/tmp/$id.tmp"))) {
 	print $store $record;
 	close $store;
 	&Reply($client, \$id, $userinput);
@@ -4927,6 +5355,116 @@ sub tmp_del_handler {
 &register_handler("tmpdel", \&tmp_del_handler, 0, 1, 0);
 
 #
+#  Process the updatebalcookie command.  This command updates a
+#  cookie in the lonBalancedir directory on a load balancer node.
+#
+# Parameters:
+#   $cmd      - Command that got us here.
+#   $tail     - Tail of the request (escaped cookie: escaped current entry)
+#
+#   $client   - socket open on the client process.
+#
+# Returns:
+#   1     - Indicating processing should continue.
+# Side Effects:
+#   A cookie file is updated from the lonBalancedir directory
+#   A reply is sent to the client.
+#
+sub update_balcookie_handler {
+    my ($cmd, $tail, $client) = @_;
+
+    my $userinput= "$cmd:$tail";
+    chomp($tail);
+    my ($cookie,$lastentry) = map { &unescape($_) } (split(/:/,$tail));
+
+    my $updatedone;
+    if ($cookie =~ /^$LONCAPA::match_domain\_$LONCAPA::match_username\_[a-f0-9]{32}$/) {
+        my $execdir=$perlvar{'lonBalanceDir'};
+        if (-e "$execdir/$cookie.id") {
+            my $doupdate;
+            if (open(my $fh,'<',"$execdir/$cookie.id")) {
+                while (my $line = <$fh>) {
+                    chomp($line);
+                    if ($line eq $lastentry) {
+                        $doupdate = 1;
+                        last;
+                    }
+                }
+                close($fh);
+            }
+            if ($doupdate) {
+                if (open(my $fh,'>',"$execdir/$cookie.id")) {
+                    print $fh $clientname;
+                    close($fh);
+                    $updatedone = 1;
+                }
+            }
+        }
+    }
+    if ($updatedone) {
+        &Reply($client, "ok\n", $userinput);
+    } else {
+        &Failure( $client, "error: ".($!+0)."file update failed ".
+                  "while attempting updatebalcookie\n", $userinput);
+    }
+    return 1;
+}
+&register_handler("updatebalcookie", \&update_balcookie_handler, 0, 1, 0);
+
+#
+#  Process the delbalcookie command. This command deletes a balancer
+#  cookie in the lonBalancedir directory on a load balancer node.
+#
+# Parameters:
+#   $cmd      - Command that got us here.
+#   $cookie   - Cookie to be deleted.
+#   $client   - socket open on the client process.
+#
+# Returns:
+#   1     - Indicating processing should continue.
+# Side Effects:
+#   A cookie file is deleted from the lonBalancedir directory
+#   A reply is sent to the client.
+sub del_balcookie_handler {
+    my ($cmd, $cookie, $client) = @_;
+
+    my $userinput= "$cmd:$cookie";
+
+    chomp($cookie);
+    $cookie = &unescape($cookie);
+    my $deleted = '';
+    if ($cookie =~ /^$LONCAPA::match_domain\_$LONCAPA::match_username\_[a-f0-9]{32}$/) {
+        my $execdir=$perlvar{'lonBalanceDir'};
+        if (-e "$execdir/$cookie.id") {
+            if (open(my $fh,'<',"$execdir/$cookie.id")) {
+                my $dodelete;
+                while (my $line = <$fh>) {
+                    chomp($line);
+                    if ($line eq $clientname) {
+                        $dodelete = 1;
+                        last;
+                    }
+                }
+                close($fh);
+                if ($dodelete) {
+                    if (unlink("$execdir/$cookie.id")) {
+                        $deleted = 1;
+                    }
+                }
+            }
+        }
+    }
+    if ($deleted) {
+        &Reply($client, "ok\n", $userinput);
+    } else {
+        &Failure( $client, "error: ".($!+0)."Unlinking cookie file Failed ".
+                  "while attempting delbalcookie\n", $userinput);
+    }
+    return 1;
+}
+&register_handler("delbalcookie", \&del_balcookie_handler, 0, 1, 0);
+
+#
 #   Processes the setannounce command.  This command
 #   creates a file named announce.txt in the top directory of
 #   the documentn root and sets its contents.  The announce.txt file is
@@ -5109,6 +5647,39 @@ sub validate_instcode_handler {
 }
 &register_handler("autovalidateinstcode", \&validate_instcode_handler, 0, 1, 0);
 
+#
+#  Validate co-owner for cross-listed institutional code and
+#  institutional course code itself used for a LON-CAPA course.
+#
+# Formal Parameters:
+#   $cmd          - The command request that got us dispatched.
+#   $tail         - The tail of the command.  In this case,
+#                   this is a colon separated string containing:
+#      $dom            - Course's LON-CAPA domain
+#      $instcode       - Institutional course code for the course
+#      $inst_xlist     - Institutional course Id for the crosslisting
+#      $coowner        - Username of co-owner
+#      (values for all but $dom have been escaped).
+#
+#   $client       - Socket open on the client.
+# Returns:
+#    1           - Indicating processing should continue.
+#
+sub validate_instcrosslist_handler  {
+    my ($cmd, $tail, $client) = @_;
+    my $userinput = "$cmd:$tail";
+    my ($dom,$instcode,$inst_xlist,$coowner) = split(/:/,$tail);
+    $instcode = &unescape($instcode);
+    $inst_xlist = &unescape($inst_xlist);
+    $coowner = &unescape($coowner);
+    my $outcome = &localenroll::validate_crosslist_access($dom,$instcode,
+                                                          $inst_xlist,$coowner);
+    &Reply($client, \$outcome, $userinput);
+
+    return 1;
+}
+&register_handler("autovalidateinstcrosslist", \&validate_instcrosslist_handler, 0, 1, 0);
+
 #   Get the official sections for which auto-enrollment is possible.
 #   Since the admin people won't know about 'unofficial sections' 
 #   we cannot auto-enroll on them.
@@ -5205,9 +5776,10 @@ sub validate_course_section_handler {
 # Formal Parameters:
 #    $cmd     - The command request that got us dispatched.
 #    $tail    - The tail of the command.   In this case this is a colon separated
-#               set of words that will be split into:
+#               set of values that will be split into:
 #               $inst_class  - Institutional code for the specific class section   
-#               $courseowner - The escaped username:domain of the course owner 
+#               $ownerlist   - An escaped comma-separated list of username:domain
+#                              of the course owner, and co-owner(s).
 #               $cdom        - The domain of the course from the institution's
 #                              point of view.
 #    $client  - The socket open on the client.
@@ -5232,6 +5804,112 @@ sub validate_class_access_handler {
 &register_handler("autovalidateclass_sec", \&validate_class_access_handler, 0, 1, 0);
 
 #
+#    Modify institutional sections (using customized &instsec_reformat()
+#    routine in localenroll.pm), to either clutter or declutter, for
+#    purposes of ensuring an institutional course section (string) can
+#    be unambiguously separated into institutional course and section.
+#
+# Formal Parameters:
+#    $cmd     - The command request that got us dispatched.
+#    $tail    - The tail of the command.   In this case this is a colon separated
+#               set of values that will be split into:
+#               $cdom        - The LON-CAPA domain of the course.
+#               $action      - Either: clutter or declutter
+#                              clutter adds character(s) to eliminate ambiguity
+#                              declutter removes the added characters (e.g., for
+#                              display of the institutional course section string.
+#               $info        - A frozen hash in which keys are:
+#                              LON-CAPA course number:Institutional course code
+#                              and values are a reference to an array of the
+#                              items to modify -- either institutional sections,
+#                              or institutional course sections (for crosslistings).
+#    $client  - The socket open on the client.
+# Returns:
+#    1 - continue processing.
+#
+
+sub instsec_reformat_handler {
+    my ($cmd, $tail, $client) = @_;
+    my $userinput = "$cmd:$tail";
+    my ($cdom,$action,$info) = split(/:/,$tail);
+    my $instsecref = &Apache::lonnet::thaw_unescape($info);
+    my ($outcome,$result);
+    eval {
+        local($SIG{__DIE__})='DEFAULT';
+        $outcome=&localenroll::instsec_reformat($cdom,$action,$instsecref);
+        if ($outcome eq 'ok') {
+            if (ref($instsecref) eq 'HASH') {
+                foreach my $key (keys(%{$instsecref})) {
+                    $result .= &escape($key).'='.&Apache::lonnet::freeze_escape($instsecref->{$key}).'&';
+                }
+                $result =~ s/\&$//;
+            }
+        }
+    };
+    if (!$@) {
+        if ($outcome eq 'ok') {
+            &Reply( $client, \$result, $userinput);
+        } else {
+            &Reply($client,\$outcome, $userinput);
+        }
+    } else {
+        &Failure($client,"unknown_cmd\n",$userinput);
+    }
+    return 1;
+}
+&register_handler("autoinstsecreformat",\&instsec_reformat_handler, 0, 1, 0);
+
+#
+#   Validate course owner or co-owners(s) access to enrollment data for all sections
+#   and crosslistings for a particular course.
+#
+#
+# Formal Parameters:
+#    $cmd     - The command request that got us dispatched.
+#    $tail    - The tail of the command.   In this case this is a colon separated
+#               set of values that will be split into:
+#               $ownerlist   - An escaped comma-separated list of username:domain
+#                              of the course owner, and co-owner(s).
+#               $cdom        - The domain of the course from the institution's
+#                              point of view.
+#               $classes     - Frozen hash of institutional course sections and
+#                              crosslistings.
+#    $client  - The socket open on the client.
+# Returns:
+#    1 - continue processing.
+#
+
+sub validate_classes_handler {
+    my ($cmd, $tail, $client) = @_;
+    my $userinput = "$cmd:$tail";
+    my ($ownerlist,$cdom,$classes) = split(/:/, $tail);
+    my $classesref = &Apache::lonnet::thaw_unescape($classes);
+    my $owners = &unescape($ownerlist);
+    my $result;
+    eval {
+        local($SIG{__DIE__})='DEFAULT';
+        my %validations;
+        my $response = &localenroll::check_instclasses($owners,$cdom,$classesref,
+                                                       \%validations);
+        if ($response eq 'ok') {
+            foreach my $key (keys(%validations)) {
+                $result .= &escape($key).'='.&Apache::lonnet::freeze_escape($validations{$key}).'&';
+            }
+            $result =~ s/\&$//;
+        } else {
+            $result = 'error';
+        }
+    };
+    if (!$@) {
+        &Reply($client, \$result, $userinput);
+    } else {
+        &Failure($client,"unknown_cmd\n",$userinput);
+    }
+    return 1;
+}
+&register_handler("autovalidateinstclasses", \&validate_classes_handler, 0, 1, 0);
+
+#
 #   Create a password for a new LON-CAPA user added by auto-enrollment.
 #   Only used for case where authentication method for new user is localauth
 #
@@ -5266,13 +5944,59 @@ sub create_auto_enroll_password_handler
 &register_handler("autocreatepassword", \&create_auto_enroll_password_handler, 
 		  0, 1, 0);
 
+sub auto_export_grades_handler {
+    my ($cmd, $tail, $client) = @_;
+    my $userinput = "$cmd:$tail";
+    my ($cdom,$cnum,$info,$data) = split(/:/,$tail);
+    my $inforef = &Apache::lonnet::thaw_unescape($info);
+    my $dataref = &Apache::lonnet::thaw_unescape($data);
+    my ($outcome,$result);;
+    eval {
+        local($SIG{__DIE__})='DEFAULT';
+        my %rtnhash;
+        $outcome=&localenroll::export_grades($cdom,$cnum,$inforef,$dataref,\%rtnhash);
+        if ($outcome eq 'ok') {
+            foreach my $key (keys(%rtnhash)) {
+                $result .= &escape($key).'='.&Apache::lonnet::freeze_escape($rtnhash{$key}).'&';
+            }
+            $result =~ s/\&$//;
+        }
+    };
+    if (!$@) {
+        if ($outcome eq 'ok') {
+            if ($cipher) {
+                my $cmdlength=length($result);
+                $result.="         ";
+                my $encresult='';
+                for (my $encidx=0;$encidx<=$cmdlength;$encidx+=8) {
+                    $encresult.= unpack("H16",
+                                        $cipher->encrypt(substr($result,
+                                                                $encidx,
+                                                                8)));
+                }
+                &Reply( $client, "enc:$cmdlength:$encresult\n", $userinput);
+            } else {
+                &Failure( $client, "error:no_key\n", $userinput);
+            }
+        } else {
+            &Reply($client, "$outcome\n", $userinput);
+        }
+    } else {
+        &Failure($client,"export_error\n",$userinput);
+    }
+    return 1;
+}
+&register_handler("autoexportgrades", \&auto_export_grades_handler,
+                  1, 1, 0);
+
+
 #   Retrieve and remove temporary files created by/during autoenrollment.
 #
 # Formal Parameters:
 #    $cmd      - The command that got us dispatched.
 #    $tail     - The tail of the command.  In our case this is a colon 
 #                separated list that will be split into:
-#                $filename - The name of the file to remove.
+#                $filename - The name of the file to retrieve.
 #                            The filename is given as a path relative to
 #                            the LonCAPA temp file directory.
 #    $client   - Socket open on the client.
@@ -5286,7 +6010,11 @@ sub retrieve_auto_file_handler {
     my ($filename)   = split(/:/, $tail);
 
     my $source = $perlvar{'lonDaemons'}.'/tmp/'.$filename;
-    if ( (-e $source) && ($filename ne '') ) {
+    if ($filename =~m{/\.\./}) {
+        &Failure($client, "refused\n", $userinput);
+    } elsif ($filename !~ /^$LONCAPA::match_domain\_$LONCAPA::match_courseid\_.+_classlist\.xml$/) {
+        &Failure($client, "refused\n", $userinput);
+    } elsif ( (-e $source) && ($filename ne '') ) {
 	my $reply = '';
 	if (open(my $fh,$source)) {
 	    while (<$fh>) {
@@ -5394,7 +6122,7 @@ sub crsreq_update_handler {
                                                 $title,$code,$accessstart,$accessend,
                                                 $incoming,\%rtnhash);
         if ($outcome eq 'ok') {
-            my @posskeys = qw(createdweb createdmsg queuedweb queuedmsg formitems reviewweb);
+            my @posskeys = qw(createdweb createdmsg createdcustomized createdactions queuedweb queuedmsg formitems reviewweb validationjs onload javascript);
             foreach my $key (keys(%rtnhash)) {
                 if (grep(/^\Q$key\E/,@posskeys)) {
                     $result .= &escape($key).'='.&Apache::lonnet::freeze_escape($rtnhash{$key}).'&';
@@ -6159,8 +6887,8 @@ my $wwwid=getpwnam('www');
 if ($wwwid!=$<) {
    my $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
    my $subj="LON: $currenthostid User ID mismatch";
-   system("echo 'User ID mismatch.  lond must be run as user www.' |\
- mailto $emailto -s '$subj' > /dev/null");
+   system("echo 'User ID mismatch.  lond must be run as user www.' |".
+          " mail -s '$subj' $emailto > /dev/null");
    exit 1;
 }
 
@@ -6610,7 +7338,7 @@ sub make_new_child {
         &Authen::Krb5::init_context();
 
         my $no_ets;
-        if ($dist =~ /^(?:centos|rhes|scientific)(\d+)$/) {
+        if ($dist =~ /^(?:centos|rhes|scientific|oracle|rocky|alma)(\d+)/) {
             if ($1 >= 7) {
                 $no_ets = 1;
             }
@@ -6743,7 +7471,6 @@ sub make_new_child {
 				  ."Attempted insecure connection disallowed </font>");
 			close $client;
 			$clientok = 0;
-			
 		    }
 		}
 	    } else {
@@ -6752,7 +7479,6 @@ sub make_new_child {
 			 ."$clientip failed to initialize: >$remotereq< </font>");
 		&status('No init '.$clientip);
 	    }
-	    
 	} else {
 	    &logthis(
 		     "<font color='blue'>WARNING: Unknown client $clientip</font>");
@@ -6778,7 +7504,7 @@ sub make_new_child {
 		Debug("Main: Got $user_input\n");
 		$keep_going = &process_request($user_input);
 		alarm(0);
-		&status('Listening to '.$clientname." ($keymode)");	   
+		&status('Listening to '.$clientname." ($keymode)");
 	    }
 
 # --------------------------------------------- client unknown or fishy, refuse
@@ -6794,8 +7520,8 @@ sub make_new_child {
     
     &logthis("<font color='red'>CRITICAL: "
 	     ."Disconnect from $clientip ($clientname)</font>");    
-    
-    
+
+
     # this exit is VERY important, otherwise the child will become
     # a producer of more and more children, forking yourself into
     # process death.
@@ -6910,15 +7636,25 @@ sub password_filename {
 #    domain    - domain of the user.
 #    name      - User's name.
 #    contents  - New contents of the file.
+#    saveold   - (optional). If true save old file in a passwd.bak file.
 # Returns:
 #   0    - Failed.
 #   1    - Success.
 #
 sub rewrite_password_file {
-    my ($domain, $user, $contents) = @_;
+    my ($domain, $user, $contents, $saveold) = @_;
 
     my $file = &password_filename($domain, $user);
     if (defined $file) {
+        if ($saveold) {
+            my $bakfile = $file.'.bak';
+            if (CopyFile($file,$bakfile)) {
+                chmod(0400,$bakfile);
+                &logthis("Old password saved in passwd.bak for internally authenticated user: $user:$domain");
+            } else {
+                &logthis("Failed to save old password in passwd.bak for internally authenticated user: $user:$domain");
+            }
+        }
 	my $pf = IO::File->new(">$file");
 	if($pf) {
 	    print $pf "$contents\n";
@@ -7009,10 +7745,28 @@ sub validate_user {
                 $contentpwd = $domdefaults{'auth_arg_def'}; 
             }
         }
-    } 
+    }
     if ($howpwd ne 'nouser') {
 	if($howpwd eq "internal") { # Encrypted is in local password file.
-	    $validated = (crypt($password, $contentpwd) eq $contentpwd);
+            if (length($contentpwd) == 13) {
+                $validated = (crypt($password,$contentpwd) eq $contentpwd);
+                if ($validated) {
+                    my %domdefaults = &Apache::lonnet::get_domain_defaults($domain);
+                    if ($domdefaults{'intauth_switch'}) {
+                        my $ncpass = &hash_passwd($domain,$password);
+                        my $saveold;
+                        if ($domdefaults{'intauth_switch'} == 2) {
+                            $saveold = 1;
+                        }
+                        if (&rewrite_password_file($domain,$user,"$howpwd:$ncpass",$saveold)) {
+                            &update_passwd_history($user,$domain,$howpwd,'conversion');
+                            &logthis("Validated password hashed with bcrypt for $user:$domain");
+                        }
+                    }
+                }
+            } else {
+                $validated = &check_internal_passwd($password,$contentpwd,$domain,$user);
+            }
 	}
 	elsif ($howpwd eq "unix") { # User is a normal unix user.
 	    $contentpwd = (getpwnam($user))[1];
@@ -7080,6 +7834,50 @@ sub validate_user {
     return $validated;
 }
 
+sub check_internal_passwd {
+    my ($plainpass,$stored,$domain,$user) = @_;
+    my (undef,$method,@rest) = split(/!/,$stored);
+    if ($method eq 'bcrypt') {
+        my $result = &hash_passwd($domain,$plainpass,@rest);
+        if ($result ne $stored) {
+            return 0;
+        }
+        my %domdefaults = &Apache::lonnet::get_domain_defaults($domain);
+        if ($domdefaults{'intauth_check'}) {
+            # Upgrade to a larger number of rounds if necessary
+            my $defaultcost = $domdefaults{'intauth_cost'};
+            if (($defaultcost eq '') || ($defaultcost =~ /D/)) {
+                $defaultcost = 10;
+            }
+            if (int($rest[0])<int($defaultcost)) {
+                if ($domdefaults{'intauth_check'} == 1) {
+                    my $ncpass = &hash_passwd($domain,$plainpass);
+                    if (&rewrite_password_file($domain,$user,"internal:$ncpass")) {
+                        &update_passwd_history($user,$domain,'internal','update cost');
+                        &logthis("Validated password hashed with bcrypt for $user:$domain");
+                    }
+                    return 1;
+                } elsif ($domdefaults{'intauth_check'} == 2) {
+                    return 0;
+                }
+            }
+        } else {
+            return 1;
+        }
+    }
+    return 0;
+}
+
+sub get_last_authchg {
+    my ($domain,$user) = @_;
+    my $lastmod;
+    my $logname = &propath($domain,$user).'/passwd.log';
+    if (-e "$logname") {
+        $lastmod = (stat("$logname"))[9];
+    }
+    return $lastmod;
+}
+
 sub krb4_authen {
     my ($password,$null,$user,$contentpwd) = @_;
     my $validated = 0;
@@ -7395,26 +8193,26 @@ sub change_unix_password {
 
 
 sub make_passwd_file {
-    my ($uname,$udom,$umode,$npass,$passfilename)=@_;
+    my ($uname,$udom,$umode,$npass,$passfilename,$action)=@_;
     my $result="ok";
     if ($umode eq 'krb4' or $umode eq 'krb5') {
 	{
 	    my $pf = IO::File->new(">$passfilename");
 	    if ($pf) {
 		print $pf "$umode:$npass\n";
+                &update_passwd_history($uname,$udom,$umode,$action);
 	    } else {
 		$result = "pass_file_failed_error";
 	    }
 	}
     } elsif ($umode eq 'internal') {
-	my $salt=time;
-	$salt=substr($salt,6,2);
-	my $ncpass=crypt($npass,$salt);
+        my $ncpass = &hash_passwd($udom,$npass);
 	{
 	    &Debug("Creating internal auth");
 	    my $pf = IO::File->new(">$passfilename");
 	    if($pf) {
 		print $pf "internal:$ncpass\n"; 
+                &update_passwd_history($uname,$udom,$umode,$action);
 	    } else {
 		$result = "pass_file_failed_error";
 	    }
@@ -7424,6 +8222,7 @@ sub make_passwd_file {
 	    my $pf = IO::File->new(">$passfilename");
 	    if($pf) {
 		print $pf "localauth:$npass\n";
+                &update_passwd_history($uname,$udom,$umode,$action);
 	    } else {
 		$result = "pass_file_failed_error";
 	    }
@@ -7494,6 +8293,18 @@ sub get_usersession_config {
     return;
 }
 
+sub get_usersearch_config {
+    my ($dom,$name) = @_;
+    my ($usersearchconf,$cached)=&Apache::lonnet::is_cached_new($name,$dom);
+    if (defined($cached)) {
+        return $usersearchconf;
+    } else {
+        my %domconfig = &Apache::lonnet::get_dom('configuration',['directorysrch'],$dom);
+        &Apache::lonnet::do_cache_new($name,$dom,$domconfig{'directorysrch'},3600);
+        return $domconfig{'directorysrch'};
+    }
+    return;
+}
 
 sub distro_and_arch {
     return $dist.':'.$arch;