diff --git a/src/main/scala/app/ControllerBase.scala b/src/main/scala/app/ControllerBase.scala
index 3ebad37..da60646 100644
--- a/src/main/scala/app/ControllerBase.scala
+++ b/src/main/scala/app/ControllerBase.scala
@@ -1,9 +1,9 @@
 package app
 
+import model.Account
 import org.scalatra._
 import org.scalatra.json._
 import org.json4s._
-import org.json4s.jackson._
 import jp.sf.amateras.scalatra.forms._
 
 /**
@@ -13,11 +13,35 @@
   
   implicit val jsonFormats = DefaultFormats
   
-  implicit def context: Context = Context(servletContext.getContextPath, LoginUser)
+  implicit def context: Context = Context(servletContext.getContextPath, LoginAccount)
   
-  // TODO get from session
-  private val LoginUser = "admin" //System.getProperty("user.name")
-  
+  private def LoginAccount: Option[Account] = {
+    session.get("LOGIN_ACCOUNT") match {
+      case Some(x: Account) => Some(x)
+      case _ => None
+    }
+  }
+
+  protected def usersOnly(action: => Any) = {
+    {
+      context.loginAccount match {
+        case Some(x) => action
+        case None    => redirect("/signin")
+      }
+    }
+  }
+
+  protected def usersOnly[T](action: T => Any) = {
+    (form: T) => {
+      context.loginAccount match {
+        case Some(x) => action(form)
+        case None    => redirect("/signin")
+      }
+    }
+  }
+
+//  protected def adminOnly()
+
 }
 
-case class Context(path: String, loginUser: String)
\ No newline at end of file
+case class Context(path: String, loginAccount: Option[Account])
\ No newline at end of file
diff --git a/src/main/scala/app/CreateRepositoryController.scala b/src/main/scala/app/CreateRepositoryController.scala
index 850253c..1a650a5 100644
--- a/src/main/scala/app/CreateRepositoryController.scala
+++ b/src/main/scala/app/CreateRepositoryController.scala
@@ -8,12 +8,13 @@
 import org.apache.commons.io._
 import jp.sf.amateras.scalatra.forms._
 
-class CreateRepositoryController extends CreateRepositoryControllerBase with ProjectService with AccountService
+class CreateRepositoryController extends CreateRepositoryControllerBase
+  with ProjectService with AccountService with WikiService
 
 /**
  * Creates new repository.
  */
-trait CreateRepositoryControllerBase extends ControllerBase { self: ProjectService =>
+trait CreateRepositoryControllerBase extends ControllerBase { self: ProjectService with WikiService =>
 
   case class RepositoryCreationForm(name: String, description: String) // TODO Option
 
@@ -25,19 +26,21 @@
   /**
    * Show the new repository form.
    */
-  get("/new") {
+  get("/new")(usersOnly {
     html.newrepo()
-  }
+  })
   
   /**
    * Create new repository.
    */
-  post("/new", form) { form =>
+  post("/new", form)(usersOnly { form =>
+    val loginUserName = context.loginAccount.get.userName
+
     // Insert to the database at first
-    createProject(form.name, context.loginUser, Some(form.description))
+    createProject(form.name, loginUserName, Some(form.description))
 
     // Create the actual repository
-    val gitdir = getRepositoryDir(context.loginUser, form.name)
+    val gitdir = getRepositoryDir(loginUserName, form.name)
     val repository = new RepositoryBuilder().setGitDir(gitdir).setBare.build
 
     repository.create
@@ -46,7 +49,7 @@
     config.setBoolean("http", null, "receivepack", true)
     config.save
 
-    val tmpdir = getInitRepositoryDir(context.loginUser, form.name)
+    val tmpdir = getInitRepositoryDir(loginUserName, form.name)
     try {
       // Clone the repository
       Git.cloneRepository.setURI(gitdir.toURI.toString).setDirectory(tmpdir).call
@@ -67,9 +70,12 @@
       FileUtils.deleteDirectory(tmpdir)
     }
 
+    // Create Wiki repository
+    createWikiRepository(context.loginAccount.get, form.name)
+
     // redirect to the repository
-    redirect("/%s/%s".format(context.loginUser, form.name))
-  }
+    redirect("/%s/%s".format(loginUserName, form.name))
+  })
   
   /**
    * Constraint for the repository name.
@@ -78,7 +84,7 @@
     def validate(name: String, value: String): Option[String] = {
       if(!value.matches("^[a-zA-Z0-9\\-_]+$")){
         Some("Repository name contains invalid character.")
-      } else if(getRepositories(context.loginUser, servletContext).contains(value)){
+      } else if(getRepositories(context.loginAccount.get.userName, servletContext).contains(value)){
         Some("Repository already exists.")
       } else {
         None
diff --git a/src/main/scala/app/SignInController.scala b/src/main/scala/app/SignInController.scala
index a6fc748..8a71579 100644
--- a/src/main/scala/app/SignInController.scala
+++ b/src/main/scala/app/SignInController.scala
@@ -1,8 +1,11 @@
 package app
 
+import service._
 import jp.sf.amateras.scalatra.forms._
 
-class SignInController extends ControllerBase {
+class SignInController extends SignInControllerBase with AccountService
+
+trait SignInControllerBase extends ControllerBase { self: AccountService =>
   
   case class SignInForm(email: String, password: String)
   
@@ -16,7 +19,18 @@
   }
 
   post("/signin", form){ form =>
-    // TODO check email and password
-    redirect("/%s".format(context.loginUser))
+    val account = getAccountByUserName(form.email)
+    if(account.isEmpty || account.get.password != form.password){
+      redirect("/signin")
+    } else {
+      session.setAttribute("LOGIN_ACCOUNT", account.get)
+      redirect("/%s".format(account.get.userName))
+    }
   }
+
+  get("/signout"){
+    session.invalidate
+    redirect("/signin")
+  }
+
 }
\ No newline at end of file
diff --git a/src/main/scala/app/WikiController.scala b/src/main/scala/app/WikiController.scala
index c307ecb..dac5d30 100644
--- a/src/main/scala/app/WikiController.scala
+++ b/src/main/scala/app/WikiController.scala
@@ -94,7 +94,7 @@
     val repository = params("repository")
     
     saveWikiPage(owner, repository, form.currentPageName, form.pageName, 
-        form.content, context.loginUser, form.message.getOrElse(""))
+        form.content, context.loginAccount.get, form.message.getOrElse(""))
     
     redirect("%s/%s/wiki/%s".format(owner, repository, form.pageName))
   }
@@ -111,7 +111,7 @@
     val repository = params("repository")
     
     saveWikiPage(owner, repository, form.currentPageName, form.pageName, 
-        form.content, context.loginUser, form.message.getOrElse(""))
+        form.content, context.loginAccount.get, form.message.getOrElse(""))
     
     redirect("%s/%s/wiki/%s".format(owner, repository, form.pageName))
   }
@@ -121,7 +121,7 @@
     val repository = params("repository")
     val page       = params("page")
     
-    deleteWikiPage(owner, repository, page, context.loginUser, "Delete %s".format(page))
+    deleteWikiPage(owner, repository, page, context.loginAccount.get.userName, "Delete %s".format(page))
     
     redirect("%s/%s/wiki".format(owner, repository))
   }
diff --git a/src/main/scala/service/WikiService.scala b/src/main/scala/service/WikiService.scala
index f33bb63..4944399 100644
--- a/src/main/scala/service/WikiService.scala
+++ b/src/main/scala/service/WikiService.scala
@@ -34,17 +34,16 @@
 }
 
 trait WikiService {
-  
   import WikiService._
   
   // TODO synchronized?
-  def createWikiRepository(owner: String, repository: String): Unit = {
-    val dir = Directory.getWikiRepositoryDir(owner, repository)
+  def createWikiRepository(owner: model.Account, repository: String): Unit = {
+    val dir = Directory.getWikiRepositoryDir(owner.userName, repository)
     if(!dir.exists){
       val repo = new RepositoryBuilder().setGitDir(dir).setBare.build
       try {
         repo.create
-        saveWikiPage(owner, repository, "Home", "Home", "Welcome to the %s wiki!!".format(repository), owner, "Initial Commit")
+        saveWikiPage(owner.userName, repository, "Home", "Home", "Welcome to the %s wiki!!".format(repository), owner, "Initial Commit")
       } finally {
         repo.close
       }
@@ -55,9 +54,6 @@
    * Returns the wiki page.
    */
   def getWikiPage(owner: String, repository: String, pageName: String): Option[WikiPageInfo] = {
-    // TODO create wiki repository in the repository setting changing.
-    createWikiRepository(owner, repository)
-    
     JGitUtil.withGit(Directory.getWikiRepositoryDir(owner, repository)){ git =>
       try {
         JGitUtil.getFileList(git, "master", ".").find(_.name == pageName + ".md").map { file =>
@@ -82,11 +78,8 @@
    * Save the wiki page.
    */
   def saveWikiPage(owner: String, repository: String, currentPageName: String, newPageName: String,
-      content: String, committer: String, message: String): Unit = {
-    
-    // TODO create wiki repository in the repository setting changing.
-    createWikiRepository(owner, repository)
-    
+      content: String, committer: model.Account, message: String): Unit = {
+
     val workDir = Directory.getWikiWorkDir(owner, repository)
     
     // clone
@@ -118,8 +111,7 @@
     
       // commit and push
       if(added || deleted){
-        // TODO committer's mail address
-        git.commit.setAuthor(committer, committer + "@devnull").setMessage(message).call
+        git.commit.setCommitter(committer.userName, committer.mailAddress).setMessage(message).call
         git.push.call
       }
     }
@@ -129,8 +121,6 @@
    * Delete the wiki page.
    */
   def deleteWikiPage(owner: String, repository: String, pageName: String, committer: String, message: String): Unit = {
-    // TODO create wiki repository in the repository setting changing.
-    createWikiRepository(owner, repository)
     
     val workDir = Directory.getWikiWorkDir(owner, repository)
     
diff --git a/src/main/twirl/index.scala.html b/src/main/twirl/index.scala.html
index d6f9b38..4de76a1 100644
--- a/src/main/twirl/index.scala.html
+++ b/src/main/twirl/index.scala.html
@@ -3,7 +3,7 @@
 @main("GitBucket"){
   <h1>GitBucket</h1>
   <ul>
-    <li><a href="@path/@context.loginUser">User page</a></li>
+    <li><a href="@path/@context.loginAccount.get.userName">User page</a></li>
     <li><a href="@path/new">Create new repository</a></li>
   </ul>
 }
\ No newline at end of file
diff --git a/src/main/twirl/main.scala.html b/src/main/twirl/main.scala.html
index a0e7a3f..16897cc 100644
--- a/src/main/twirl/main.scala.html
+++ b/src/main/twirl/main.scala.html
@@ -31,10 +31,14 @@
           <a class="brand" href="#">GitBucket</a>
           <div class="nav-collapse collapse">
             <ul class="nav pull-right">
-              <li><a href="@path/new">New repo</a></li>
-              <li><a href="@path/@context.loginUser">Account</a></li>
-              <li><a href="#users">Users</a></li>
-              <li><a href="#contact">Sign out</a></li>
+              @if(loginAccount.isDefined){
+                <li><a href="@path/new">New repo</a></li>
+                <li><a href="@path/@loginAccount.get.userName">Account</a></li>
+                <li><a href="#users">Users</a></li>
+                <li><a href="@path/signout">Sign out</a></li>
+              } else {
+                <li><a href="@path/signin">Sign in</a></li>
+              }
             </ul>
           </div><!--/.nav-collapse -->
         </div>
diff --git a/src/main/twirl/user.scala.html b/src/main/twirl/user.scala.html
index d881c7d..b9d2124 100644
--- a/src/main/twirl/user.scala.html
+++ b/src/main/twirl/user.scala.html
@@ -25,7 +25,7 @@
         </ul>
         @repositories.map { repository =>
         <div class="block">
-          <div class="block-header-2"><a href="@path/@user/@repository.name">@repository.name</a></div>
+          <div class="block-header-2"><a href="@path/@repository.owner/@repository.name">@repository.name</a></div>
           <div>@repository.project.description</div>
           <div><span class="description small">Last updated: @repository.project.lastActivityDate</span></div>
         </div>