Fix for Keycloak 22.0.1 unable to create user with long email address (#23109)

Closes #22825

docs/documentation/upgrading/topics/keycloak/changes-22_0_2.adoc

@@ -11,3 +11,9 @@ The old LinkedIn way based on OAuth seems to be completely removed from the link
 ```
 kc.[sh|bat] start --features linkedin-oauth ...
 ```
+
+= A new parameter --spi-user-profile-declarative-user-profile-max-email-local-part-length is added to set max email local part length taking backwards compatibility into consideration. The default value is 64.
+
+```
+kc.[sh|bat] start --spi-user-profile-declarative-user-profile-max-email-local-part-length=100 ...
+```

server-spi-private/src/main/java/org/keycloak/utils/EmailValidationUtil.java

@@ -3,12 +3,11 @@ package org.keycloak.utils;
 import java.net.IDN;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
+import org.keycloak.Config;
 
 import static java.util.regex.Pattern.CASE_INSENSITIVE;
 
 public class EmailValidationUtil {
-    private static final int MAX_LOCAL_PART_LENGTH = 64;
-
     private static final String LOCAL_PART_ATOM = "[a-z0-9!#$%&'*+/=?^_`{|}~\u0080-\uFFFF-]";
     private static final String LOCAL_PART_INSIDE_QUOTES_ATOM = "(?:[a-z0-9!#$%&'*.(),<>\\[\\]:;  @+/=?^_`{|}~\u0080-\uFFFF-]|\\\\\\\\|\\\\\\\")";
     /**
@@ -29,6 +28,8 @@ public class EmailValidationUtil {
      */
     private static final Pattern EMAIL_DOMAIN_PATTERN = Pattern.compile(DOMAIN + "|\\[" + IP_DOMAIN + "\\]|" + "\\[IPv6:" + IP_V6_DOMAIN + "\\]", CASE_INSENSITIVE);
 
+    public static final String MAX_EMAIL_LOCAL_PART_LENGTH = "max-email-local-part-length";
+
 
     public static boolean isValidEmail(String value) {
         if ( value == null || value.length() == 0 ) {
@@ -56,7 +57,8 @@ public class EmailValidationUtil {
     }
 
     private static boolean isValidEmailLocalPart(String localPart) {
-        if ( localPart.length() > MAX_LOCAL_PART_LENGTH ) {
+
+        if ( localPart.length() > Config.scope("user-profile-declarative-user-profile").getInt(MAX_EMAIL_LOCAL_PART_LENGTH,64) ) {
             return false;
         }
         Matcher matcher = LOCAL_PART_PATTERN.matcher( localPart );

services/src/main/java/org/keycloak/userprofile/AbstractUserProfileProvider.java

@@ -71,6 +71,7 @@ public abstract class AbstractUserProfileProvider<U extends UserProfileProvider>
 
     public static final String CONFIG_ADMIN_READ_ONLY_ATTRIBUTES = "admin-read-only-attributes";
     public static final String CONFIG_READ_ONLY_ATTRIBUTES = "read-only-attributes";
+    public static final String MAX_EMAIL_LOCAL_PART_LENGTH = "max-email-local-part-length";
 
     private static boolean editUsernameCondition(AttributeContext c) {
         KeycloakSession session = c.getSession();
@@ -441,6 +442,12 @@ public abstract class AbstractUserProfileProvider<U extends UserProfileProvider>
                 .helpText("Array of regular expressions to identify fields that should be treated read-only so administrators can't change them.")
                 .add()
 
+                .property()
+                .name(MAX_EMAIL_LOCAL_PART_LENGTH)
+                .type(ProviderConfigProperty.STRING_TYPE)
+                .helpText("To set user profile max email local part length")
+                .add()
+
                 .build();
     }
 

services/src/test/java/org/keycloak/test/ValidationTest.java

@@ -41,6 +41,8 @@ public class ValidationTest {
         Assert.assertFalse(Validation.isEmailValid("abc@foo."));
         Assert.assertFalse(Validation.isEmailValid("abc@foo..bar"));
         Assert.assertTrue(Validation.isEmailValid("diegø@foo.com"));
+        Assert.assertTrue(Validation.isEmailValid("qwertyuiopasdfghjklz@foo.com"));
+        Assert.assertFalse(Validation.isEmailValid("qwertyuiopasdfghjklzxcvbnmqwertyuiopasdfghjklzxcvbnmqwertyqwertyu@foo.com"));
     }
     
     @Test

testsuite/integration-arquillian/servers/auth-server/quarkus/src/main/content/conf/keycloak.conf

@@ -32,6 +32,7 @@ spi-truststore-file-password=secret
 spi-user-profile-provider=declarative-user-profile
 spi-user-profile-declarative-user-profile-read-only-attributes=deniedFoo,deniedBar*,deniedSome/thing,deniedsome*thing
 spi-user-profile-declarative-user-profile-admin-read-only-attributes=deniedSomeAdmin
+spi-user-profile-declarative-user-profile-max-email-local-part-length=100
 
 #password-blacklists path
 spi-password-policy-password-blacklist-blacklists-path=${kc.home.dir:}/dependency/password-blacklists