--- loncom/lonnet/perl/lonnet.pm	2018/02/01 04:51:13	1.1367
+++ loncom/lonnet/perl/lonnet.pm	2018/03/23 01:02:04	1.1368
@@ -1,7 +1,7 @@
 # The LearningOnline Network
 # TCP networking package
 #
-# $Id: lonnet.pm,v 1.1367 2018/02/01 04:51:13 raeburn Exp $
+# $Id: lonnet.pm,v 1.1368 2018/03/23 01:02:04 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -7146,6 +7146,7 @@ sub usertools_access {
                       community  => 1,
                       textbook   => 1,
                       placement  => 1,
+                      lti        => 1,
                  );
     } elsif ($context eq 'requestauthor') {
         %tools = (
@@ -7342,25 +7343,29 @@ sub is_advanced_user {
 }
 
 sub check_can_request {
-    my ($dom,$can_request,$request_domains) = @_;
+    my ($dom,$can_request,$request_domains,$uname,$udom) = @_;
     my $canreq = 0;
+    if (($env{'user.name'} ne '') && ($env{'user.domain'} ne '')) {
+        $uname = $env{'user.name'};
+        $udom = $env{'user.domain'};
+    }
     my ($types,$typename) = &Apache::loncommon::course_types();
     my @options = ('approval','validate','autolimit');
     my $optregex = join('|',@options);
     if ((ref($can_request) eq 'HASH') && (ref($types) eq 'ARRAY')) {
         foreach my $type (@{$types}) {
-            if (&usertools_access($env{'user.name'},
-                                  $env{'user.domain'},
-                                  $type,undef,'requestcourses')) {
+            if (&usertools_access($uname,$udom,$type,undef,
+                                  'requestcourses')) {
                 $canreq ++;
                 if (ref($request_domains) eq 'HASH') {
-                    push(@{$request_domains->{$type}},$env{'user.domain'});
+                    push(@{$request_domains->{$type}},$udom);
                 }
-                if ($dom eq $env{'user.domain'}) {
+                if ($dom eq $udom) {
                     $can_request->{$type} = 1;
                 }
             }
-            if ($env{'environment.reqcrsotherdom.'.$type} ne '') {
+            if (($env{'user.name'} ne '') && ($env{'user.domain'} ne '') &&
+                ($env{'environment.reqcrsotherdom.'.$type} ne '')) {
                 my @curr = split(',',$env{'environment.reqcrsotherdom.'.$type});
                 if (@curr > 0) {
                     foreach my $item (@curr) {
@@ -7377,7 +7382,7 @@ sub check_can_request {
                             }
                         }
                     }
-                    unless($dom eq $env{'user.domain'}) {
+                    unless ($dom eq $env{'user.domain'}) {
                         $canreq ++;
                         if (grep(/^\Q$dom\E:($optregex)(=?\d*)$/,@curr)) {
                             $can_request->{$type} = 1;
@@ -9298,8 +9303,12 @@ sub assignrole {
                             }
                         }
                     }
-                } elsif (($selfenroll == 1) && ($role eq 'st') && ($udom eq $env{'user.domain'}) && ($uname eq $env{'user.name'})) {
-                    $refused = '';
+                } elsif (($selfenroll == 1) && ($udom eq $env{'user.domain'}) && ($uname eq $env{'user.name'})) {
+                    if ($role eq 'st') {
+                        $refused = '';
+                    } elsif (($context eq 'ltienroll') && ($env{'request.lti'})) {
+                        $refused = '';
+                    }
                 } elsif ($context eq 'requestcourses') {
                     my @possroles = ('st','ta','ep','in','cc','co');
                     if ((grep(/^\Q$role\E$/,@possroles)) && ($env{'user.name'} ne '' && $env{'user.domain'} ne '')) {
@@ -9565,10 +9574,14 @@ sub modifyuser {
     my $newuser;
     if ($uhome eq 'no_host') {
         $newuser = 1;
+        unless (($umode && ($upass ne '')) || ($umode eq 'localauth') ||
+                ($umode eq 'lti')) {
+            return 'error: more information needed to create new user';
+        }
     }
 # ----------------------------------------------------------------- Create User
     if (($uhome eq 'no_host') && 
-	(($umode && $upass) || ($umode eq 'localauth'))) {
+	(($umode && $upass) || ($umode eq 'localauth') || ($umode eq 'lti'))) {
         my $unhome='';
         if (defined($desiredhome) && &host_domain($desiredhome) eq $udom) { 
             $unhome = $desiredhome;