Merge branch 'MDL-57531-master-phpmailer' of git://github.com/mudrd8mz/moodle

admin/settings/server.php

@@ -31,7 +31,7 @@ if ($primaryadmin) {
 $temp->add(new admin_setting_configtext('supportname', new lang_string('supportname', 'admin'),
     new lang_string('configsupportname', 'admin'), $primaryadminname, PARAM_NOTAGS));
 $setting = new admin_setting_configtext('supportemail', new lang_string('supportemail', 'admin'),
-  new lang_string('configsupportemail', 'admin'), $primaryadminemail, PARAM_NOTAGS);
+    new lang_string('configsupportemail', 'admin'), $primaryadminemail, PARAM_EMAIL);
 $setting->set_force_ltr(true);
 $temp->add($setting);
 $temp->add(new admin_setting_configtext('supportpage', new lang_string('supportpage', 'admin'), new lang_string('configsupportpage', 'admin'), '', PARAM_URL));
@@ -237,7 +237,7 @@ $temp->add(new admin_setting_configtext('smtpmaxbulk', new lang_string('smtpmaxb
 $temp->add(new admin_setting_heading('noreplydomainheading', new lang_string('noreplydomain', 'admin'),
         new lang_string('noreplydomaindetail', 'admin')));
 $temp->add(new admin_setting_configtext('noreplyaddress', new lang_string('noreplyaddress', 'admin'),
-          new lang_string('confignoreplyaddress', 'admin'), 'noreply@' . get_host_from_url($CFG->wwwroot), PARAM_NOTAGS));
+          new lang_string('confignoreplyaddress', 'admin'), 'noreply@' . get_host_from_url($CFG->wwwroot), PARAM_EMAIL));
 $temp->add(new admin_setting_configtextarea('allowedemaildomains',
         new lang_string('allowedemaildomains', 'admin'),
         new lang_string('configallowedemaildomains', 'admin'),

lib/moodlelib.php

@@ -5788,7 +5788,13 @@ function email_to_user($user, $from, $subject, $messagetext, $messagehtml = '',
     $tempreplyto = array();
 
     // Make sure that we fall back onto some reasonable no-reply address.
-    $noreplyaddress = empty($CFG->noreplyaddress) ? 'noreply@' . get_host_from_url($CFG->wwwroot) : $CFG->noreplyaddress;
+    $noreplyaddressdefault = 'noreply@' . get_host_from_url($CFG->wwwroot);
+    $noreplyaddress = empty($CFG->noreplyaddress) ? $noreplyaddressdefault : $CFG->noreplyaddress;
+
+    if (!validate_email($noreplyaddress)) {
+        debugging('email_to_user: Invalid noreply-email '.s($noreplyaddress));
+        $noreplyaddress = $noreplyaddressdefault;
+    }
 
     // Make up an email address for handling bounces.
     if (!empty($CFG->handlebounces)) {
@@ -5798,6 +5804,12 @@ function email_to_user($user, $from, $subject, $messagetext, $messagehtml = '',
         $mail->Sender = $noreplyaddress;
     }
 
+    // Make sure that the explicit replyto is valid, fall back to the implicit one.
+    if (!empty($replyto) && !validate_email($replyto)) {
+        debugging('email_to_user: Invalid replyto-email '.s($replyto));
+        $replyto = $noreplyaddress;
+    }
+
     $alloweddomains = null;
     if (!empty($CFG->allowedemaildomains)) {
         $alloweddomains = explode(PHP_EOL, $CFG->allowedemaildomains);
@@ -5815,6 +5827,11 @@ function email_to_user($user, $from, $subject, $messagetext, $messagehtml = '',
     // and that the senders email setting is either displayed to everyone, or display to only other users that are enrolled
     // in a course with the sender.
     } else if ($usetrueaddress && can_send_from_real_email_address($from, $user, $alloweddomains)) {
+        if (!validate_email($from->email)) {
+            debugging('email_to_user: Invalid from-email '.s($from->email).' - not sending');
+            // Better not to use $noreplyaddress in this case.
+            return false;
+        }
         $mail->From = $from->email;
         $fromdetails = new stdClass();
         $fromdetails->name = fullname($from);

lib/tests/moodlelib_test.php

@@ -3425,4 +3425,27 @@ class core_moodlelib_testcase extends advanced_testcase {
              'samecourse' => false, 'result' => false],
         ];
     }
+
+    /**
+     * Test that generate_email_processing_address() returns valid email address.
+     */
+    public function test_generate_email_processing_address() {
+        global $CFG;
+        $this->resetAfterTest();
+
+        $data = (object)[
+            'id' => 42,
+            'email' => 'my.email+from_moodle@example.com',
+        ];
+
+        $modargs = 'B'.base64_encode(pack('V', $data->id)).substr(md5($data->email), 0, 16);
+
+        $CFG->maildomain = 'example.com';
+        $CFG->mailprefix = 'mdl+';
+        $this->assertTrue(validate_email(generate_email_processing_address(0, $modargs)));
+
+        $CFG->maildomain = 'mail.example.com';
+        $CFG->mailprefix = 'mdl-';
+        $this->assertTrue(validate_email(generate_email_processing_address(23, $modargs)));
+    }
 }

lib/tests/weblib_test.php

@@ -665,4 +665,19 @@ EXPECTED;
         );
     }
 
+    /**
+     * Tests for validate_email() function.
+     */
+    public function test_validate_email() {
+
+        $this->assertTrue(validate_email('moodle@example.com'));
+        $this->assertTrue(validate_email('moodle@localhost.local'));
+        $this->assertTrue(validate_email('verp_email+is=mighty@moodle.org'));
+        $this->assertTrue(validate_email("but_potentially'dangerous'too@example.org"));
+        $this->assertTrue(validate_email('posts+AAAAAAAAAAIAAAAAAAAGQQAAAAABFSXz1eM/P/lR2bYyljM+@posts.moodle.org'));
+
+        $this->assertFalse(validate_email('moodle@localhost'));
+        $this->assertFalse(validate_email('"attacker\\" -oQ/tmp/ -X/var/www/vhost/moodle/backdoor.php  some"@email.com'));
+        $this->assertFalse(validate_email("moodle@example.com>\r\nRCPT TO:<victim@example.com"));
+    }
 }

lib/upgrade.txt

@@ -2,10 +2,12 @@ This files describes API changes in core libraries and APIs,
 information provided here is intended especially for developers.
 
 === 3.3 ===
+
 * YUI module moodle-core-formautosubmit has been removed, use jquery .change() instead (see lib/templates/url_select.mustache for
   an example)
 * $mform->init_javascript_enhancement() is deprecated and no longer does anything. Existing uses of smartselect enhancement
   should be switched to the searchableselector form element or other solutions.
+* Return value of the validate_email() is now proper boolean as documented. Previously the function could return 1, 0 or false.
 
 === 3.2 ===
 

lib/weblib.php

@@ -1088,12 +1088,12 @@ function page_get_doc_link_path(moodle_page $page) {
  */
 function validate_email($address) {
 
-    return (preg_match('#^[-!\#$%&\'*+\\/0-9=?A-Z^_`a-z{|}~]+'.
+    return (bool)preg_match('#^[-!\#$%&\'*+\\/0-9=?A-Z^_`a-z{|}~]+'.
                  '(\.[-!\#$%&\'*+\\/0-9=?A-Z^_`a-z{|}~]+)*'.
                   '@'.
                   '[-!\#$%&\'*+\\/0-9=?A-Z^_`a-z{|}~]+\.'.
                   '[-!\#$%&\'*+\\./0-9=?A-Z^_`a-z{|}~]+$#',
-                  $address));
+                  $address);
 }
 
 /**