Add option to make ldap groups visible to everyone

A non-admin user was not allowed to add ldap group as member
of another group if user did not belong to this ldap group.

When the option ldap.visibleToAll in gerrit.config is set to
true ldap groups are visible to everyone.

Issue:2255
Change-Id: Ibd234c6dfc8d890edde2304e820d01d359fda0fd

Documentation/config-gerrit.txt

@@ -2259,6 +2259,13 @@ perform a query.
 +
 By default, true, requiring the certificate to be verified.
 
+[[ldap.groupsVisibleToAll]]ldap.groupsVisibleToAll::
++
+If true, LDAP groups are visible to all registered users.
++
+By default, false, LDAP groups are visible only to administrators and
+group members.
+
 [[ldap.username]]ldap.username::
 +
 _(Optional)_ Username to bind to the LDAP server with.  If not set,

gerrit-server/src/main/java/com/google/gerrit/server/account/AbstractGroupBackend.java

@@ -23,4 +23,9 @@ public abstract class AbstractGroupBackend implements GroupBackend {
   public boolean memberOfAny(IdentifiedUser user, Iterable<AccountGroup.UUID> ids) {
     return membershipsOf(user).containsAnyOf(ids);
   }
+
+  @Override
+  public boolean isVisibleToAll(AccountGroup.UUID uuid) {
+    return false;
+  }
 }

gerrit-server/src/main/java/com/google/gerrit/server/account/GroupBackend.java

@@ -58,4 +58,10 @@ public interface GroupBackend {
    *         given groups, {@code false} otherwise
    */
   boolean memberOfAny(IdentifiedUser user, Iterable<AccountGroup.UUID> ids);
+
+  /**
+   * @return {@code true} if the group with the given UUID is visible to all
+   *         registered users.
+   */
+  boolean isVisibleToAll(AccountGroup.UUID uuid);
 }

gerrit-server/src/main/java/com/google/gerrit/server/account/GroupControl.java

@@ -45,7 +45,7 @@ public class GroupControl {
       if (group == null) {
         throw new NoSuchGroupException(groupId);
       }
-      return new GroupControl(who, group);
+      return new GroupControl(who, group, groupBackend);
     }
   }
 
@@ -85,7 +85,7 @@ public class GroupControl {
     }
 
     public GroupControl controlFor(GroupDescription.Basic group) {
-      return new GroupControl(user.get(), group);
+      return new GroupControl(user.get(), group, groupBackend);
     }
 
     public GroupControl validateFor(final AccountGroup.Id groupId)
@@ -110,10 +110,12 @@ public class GroupControl {
   private final CurrentUser user;
   private final GroupDescription.Basic group;
   private Boolean isOwner;
+  private final GroupBackend groupBackend;
 
-  GroupControl(CurrentUser who, GroupDescription.Basic gd) {
+  GroupControl(CurrentUser who, GroupDescription.Basic gd, GroupBackend gb) {
     user = who;
     group =  gd;
+    groupBackend = gb;
   }
 
   public GroupDescription.Basic getGroup() {
@@ -126,16 +128,15 @@ public class GroupControl {
 
   /** Can this user see this group exists? */
   public boolean isVisible() {
-    AccountGroup accountGroup = GroupDescriptions.toAccountGroup(group);
     /* Check for canAdministrateServer may seem redundant, but allows
      * for visibility of all groups that are not an internal group to
      * server administrators.
      */
-    return (accountGroup != null && accountGroup.isVisibleToAll())
-      || user instanceof InternalUser
+    return user instanceof InternalUser
       || user.memberOf(group.getGroupUUID())
       || isOwner()
-      || user.getCapabilities().canAdministrateServer();
+      || user.getCapabilities().canAdministrateServer()
+      || groupBackend.isVisibleToAll(group.getGroupUUID());
   }
 
   public boolean isOwner() {

gerrit-server/src/main/java/com/google/gerrit/server/account/InternalGroupBackend.java

@@ -90,4 +90,10 @@ public class InternalGroupBackend extends AbstractGroupBackend {
   public GroupMembership membershipsOf(IdentifiedUser user) {
     return groupMembershipFactory.create(user);
   }
+
+  @Override
+  public boolean isVisibleToAll(AccountGroup.UUID uuid) {
+    GroupDescription.Internal g = get(uuid);
+    return g != null && g.getAccountGroup().isVisibleToAll();
+  }
 }

gerrit-server/src/main/java/com/google/gerrit/server/account/UniversalGroupBackend.java

@@ -206,4 +206,14 @@ public class UniversalGroupBackend extends AbstractGroupBackend {
       return groups;
     }
   }
+
+  @Override
+  public boolean isVisibleToAll(AccountGroup.UUID uuid) {
+    for (GroupBackend g : backends) {
+      if (g.handles(uuid)) {
+        return g.isVisibleToAll(uuid);
+      }
+    }
+    return false;
+  }
 }

gerrit-server/src/main/java/com/google/gerrit/server/auth/ldap/Helper.java

@@ -70,6 +70,7 @@ import javax.security.auth.login.LoginException;
   private final String readTimeoutMillis;
   private final String connectTimeoutMillis;
   private final boolean useConnectionPooling;
+  private final boolean groupsVisibleToAll;
 
   @Inject
   Helper(@GerritServerConfig final Config config,
@@ -81,6 +82,7 @@ import javax.security.auth.login.LoginException;
     this.password = LdapRealm.optional(config, "password", "");
     this.referral = LdapRealm.optional(config, "referral", "ignore");
     this.sslVerify = config.getBoolean("ldap", "sslverify", true);
+    this.groupsVisibleToAll = config.getBoolean("ldap", "groupsVisibleToAll", false);
     this.authentication =
         LdapRealm.optional(config, "authentication", "simple");
     String readTimeout = LdapRealm.optional(config, "readTimeout");
@@ -309,6 +311,10 @@ import javax.security.auth.login.LoginException;
     }
   }
 
+  public boolean groupsVisibleToAll() {
+    return this.groupsVisibleToAll;
+  }
+
   class LdapSchema {
     final LdapType type;
 

gerrit-server/src/main/java/com/google/gerrit/server/auth/ldap/LdapGroupBackend.java

@@ -250,4 +250,9 @@ public class LdapGroupBackend extends AbstractGroupBackend {
     }
     return out;
   }
+
+  @Override
+  public boolean isVisibleToAll(AccountGroup.UUID uuid) {
+    return handles(uuid) && helper.groupsVisibleToAll();
+  }
 }