server: Add modifyTimestamp and pwdChangedTime attributes (#1265)

Add a modifyTimestamp attribute to LDAP entries for users and groups, and expose pwdChangedTime for users.
These attributes let clients track when an entry (or its password) was last changed.

 -  modifyTimestamp is a server-maintained attribute that updates on any write to user or group entries, including membership changes (on the group side).

 -  pwdChangedTime is set when a user’s password is created or changed.

crates/ldap/src/core/group.rs

@@ -72,6 +72,12 @@ pub fn get_group_attribute(
                 .to_rfc3339()
                 .into_bytes(),
         ],
+        GroupFieldType::ModifiedDate => vec![
+            chrono::Utc
+                .from_utc_datetime(&group.modified_date)
+                .to_rfc3339()
+                .into_bytes(),
+        ],
         GroupFieldType::Member => group
             .users
             .iter()
@@ -260,6 +266,10 @@ fn convert_group_filter(
                     code: LdapResultCode::UnwillingToPerform,
                     message: "Creation date filter for groups not supported".to_owned(),
                 }),
+                GroupFieldType::ModifiedDate => Err(LdapError {
+                    code: LdapResultCode::UnwillingToPerform,
+                    message: "Modified date filter for groups not supported".to_owned(),
+                }),
             }
         }
         LdapFilter::And(filters) => Ok(GroupRequestFilter::And(

crates/ldap/src/core/user.rs

@@ -93,6 +93,18 @@ pub fn get_user_attribute(
                 .to_rfc3339()
                 .into_bytes(),
         ],
+        UserFieldType::PrimaryField(UserColumn::ModifiedDate) => vec![
+            chrono::Utc
+                .from_utc_datetime(&user.modified_date)
+                .to_rfc3339()
+                .into_bytes(),
+        ],
+        UserFieldType::PrimaryField(UserColumn::PasswordModifiedDate) => vec![
+            chrono::Utc
+                .from_utc_datetime(&user.password_modified_date)
+                .to_rfc3339()
+                .into_bytes(),
+        ],
         UserFieldType::Attribute(attr, _, _) => get_custom_attribute(&user.attributes, &attr)?,
         UserFieldType::NoMatch => match attribute.as_str() {
             "1.1" => return None,

crates/ldap/src/core/utils.rs

@@ -239,9 +239,15 @@ pub fn map_user_field(field: &AttributeName, schema: &PublicSchema) -> UserField
             AttributeType::JpegPhoto,
             false,
         ),
-        "creationdate" | "createtimestamp" | "modifytimestamp" | "creation_date" => {
+        "creationdate" | "createtimestamp" | "creation_date" => {
             UserFieldType::PrimaryField(UserColumn::CreationDate)
         }
+        "modifytimestamp" | "modifydate" | "modified_date" => {
+            UserFieldType::PrimaryField(UserColumn::ModifiedDate)
+        }
+        "pwdchangedtime" | "passwordmodifydate" | "password_modified_date" => {
+            UserFieldType::PrimaryField(UserColumn::PasswordModifiedDate)
+        }
         "entryuuid" | "uuid" => UserFieldType::PrimaryField(UserColumn::Uuid),
         _ => schema
             .get_schema()
@@ -257,6 +263,7 @@ pub enum GroupFieldType {
     GroupId,
     DisplayName,
     CreationDate,
+    ModifiedDate,
     ObjectClass,
     Dn,
     // Like Dn, but returned as part of the attributes.
@@ -272,9 +279,8 @@ pub fn map_group_field(field: &AttributeName, schema: &PublicSchema) -> GroupFie
         "entrydn" => GroupFieldType::EntryDn,
         "objectclass" => GroupFieldType::ObjectClass,
         "cn" | "displayname" | "uid" | "display_name" | "id" => GroupFieldType::DisplayName,
-        "creationdate" | "createtimestamp" | "modifytimestamp" | "creation_date" => {
-            GroupFieldType::CreationDate
-        }
+        "creationdate" | "createtimestamp" | "creation_date" => GroupFieldType::CreationDate,
+        "modifytimestamp" | "modifydate" | "modified_date" => GroupFieldType::ModifiedDate,
         "member" | "uniquemember" => GroupFieldType::Member,
         "entryuuid" | "uuid" => GroupFieldType::Uuid,
         "group_id" | "groupid" => GroupFieldType::GroupId,