diff --git a/.env b/.env
index 5429ab6c..fd07742b 100644
--- a/.env
+++ b/.env
@@ -4,7 +4,7 @@ ENVIRONMENT=dev
 DB_HOST=localhost
 DB_USER=postgres
 DB_PORT=5432
-DB_PASSWORD=quick
+DB_PASSWORD=admin
 DB_NAME=QuickGpt
 
 SUPER_ADMIN_EMAIL=superadmin@email.com
@@ -19,4 +19,6 @@ SMTP_SERVER=smtp.gmail.com
 SMTP_PORT=587
 SMTP_SENDER_EMAIL=shresthasaurab030@outlook.com
 SMTP_USERNAME=shresthasaurab030
-SMTP_PASSWORD=huurxwxeorxjorzw
\ No newline at end of file
+SMTP_PASSWORD=huurxwxeorxjorzw
+
+LDAP_SERVER=ldap://192.168.101.111
\ No newline at end of file
diff --git a/alembic/versions/0ef554491192_updated_documents_primary_key.py b/alembic/versions/0ef554491192_updated_documents_primary_key.py
deleted file mode 100644
index d0614e10..00000000
--- a/alembic/versions/0ef554491192_updated_documents_primary_key.py
+++ /dev/null
@@ -1,32 +0,0 @@
-"""Updated documents primary key
-
-Revision ID: 0ef554491192
-Revises: 9ce6871961b5
-Create Date: 2024-02-08 17:06:32.957163
-
-"""
-from typing import Sequence, Union
-
-from alembic import op
-import sqlalchemy as sa
-
-
-# revision identifiers, used by Alembic.
-revision: str = '0ef554491192'
-down_revision: Union[str, None] = '9ce6871961b5'
-branch_labels: Union[str, Sequence[str], None] = None
-depends_on: Union[str, Sequence[str], None] = None
-
-
-def upgrade() -> None:
-    # ### commands auto generated by Alembic - please adjust! ###
-    op.create_index(op.f('ix_document_id'), 'document', ['id'], unique=False)
-    # op.create_unique_constraint('unique_user_role', 'user_roles', ['user_id', 'role_id', 'company_id'])
-    # ### end Alembic commands ###
-
-
-def downgrade() -> None:
-    # ### commands auto generated by Alembic - please adjust! ###
-    # op.drop_constraint('unique_user_role', 'user_roles', type_='unique')
-    op.drop_index(op.f('ix_document_id'), table_name='document')
-    # ### end Alembic commands ###
diff --git a/alembic/versions/488f28da0939_remove_company_from_the_users_table.py b/alembic/versions/488f28da0939_remove_company_from_the_users_table.py
deleted file mode 100644
index 811d8dfd..00000000
--- a/alembic/versions/488f28da0939_remove_company_from_the_users_table.py
+++ /dev/null
@@ -1,36 +0,0 @@
-"""Remove company from the users table
-
-Revision ID: 488f28da0939
-Revises: 0ef554491192
-Create Date: 2024-02-09 19:08:12.002449
-
-"""
-from typing import Sequence, Union
-
-from alembic import op
-import sqlalchemy as sa
-
-
-# revision identifiers, used by Alembic.
-revision: str = '488f28da0939'
-down_revision: Union[str, None] = '0ef554491192'
-branch_labels: Union[str, Sequence[str], None] = None
-depends_on: Union[str, Sequence[str], None] = None
-
-
-def upgrade() -> None:
-    # ### commands auto generated by Alembic - please adjust! ###
-    op.create_unique_constraint(None, 'document', ['filename'])
-    # op.create_unique_constraint('unique_user_role', 'user_roles', ['user_id', 'role_id', 'company_id'])
-    op.drop_constraint('users_company_id_fkey', 'users', type_='foreignkey')
-    op.drop_column('users', 'company_id')
-    # ### end Alembic commands ###
-
-
-def downgrade() -> None:
-    # ### commands auto generated by Alembic - please adjust! ###
-    op.add_column('users', sa.Column('company_id', sa.INTEGER(), autoincrement=False, nullable=True))
-    op.create_foreign_key('users_company_id_fkey', 'users', 'companies', ['company_id'], ['id'])
-    # op.drop_constraint('unique_user_role', 'user_roles', type_='unique')
-    op.drop_constraint(None, 'document', type_='unique')
-    # ### end Alembic commands ###
diff --git a/alembic/versions/9ce6871961b5_create_document_model.py b/alembic/versions/a5839618494c_create_document.py
similarity index 68%
rename from alembic/versions/9ce6871961b5_create_document_model.py
rename to alembic/versions/a5839618494c_create_document.py
index ab8ed48a..c5193d77 100644
--- a/alembic/versions/9ce6871961b5_create_document_model.py
+++ b/alembic/versions/a5839618494c_create_document.py
@@ -1,8 +1,8 @@
-"""Create document model
+"""Create document
 
-Revision ID: 9ce6871961b5
+Revision ID: a5839618494c
 Revises: 
-Create Date: 2024-02-08 16:16:31.072913
+Create Date: 2024-02-11 12:35:13.347853
 
 """
 from typing import Sequence, Union
@@ -12,7 +12,7 @@ import sqlalchemy as sa
 
 
 # revision identifiers, used by Alembic.
-revision: str = '9ce6871961b5'
+revision: str = 'a5839618494c'
 down_revision: Union[str, None] = None
 branch_labels: Union[str, Sequence[str], None] = None
 depends_on: Union[str, Sequence[str], None] = None
@@ -21,13 +21,15 @@ depends_on: Union[str, Sequence[str], None] = None
 def upgrade() -> None:
     # ### commands auto generated by Alembic - please adjust! ###
     op.create_table('document',
-    sa.Column('id', sa.Integer(), autoincrement=True, nullable=False),
+    sa.Column('id', sa.Integer(), nullable=False),
     sa.Column('filename', sa.String(length=225), nullable=False),
     sa.Column('uploaded_by', sa.Integer(), nullable=False),
-    sa.Column('uploaded_at', sa.DateTime(), nullable=True),
+    sa.Column('uploaded_at', sa.DateTime(), nullable=False),
     sa.ForeignKeyConstraint(['uploaded_by'], ['users.id'], ),
-    sa.PrimaryKeyConstraint('id', 'uploaded_by')
+    sa.PrimaryKeyConstraint('id'),
+    sa.UniqueConstraint('filename')
     )
+    op.create_index(op.f('ix_document_id'), 'document', ['id'], unique=False)
     # op.create_unique_constraint('unique_user_role', 'user_roles', ['user_id', 'role_id', 'company_id'])
     # ### end Alembic commands ###
 
@@ -35,5 +37,6 @@ def upgrade() -> None:
 def downgrade() -> None:
     # ### commands auto generated by Alembic - please adjust! ###
     # op.drop_constraint('unique_user_role', 'user_roles', type_='unique')
+    op.drop_index(op.f('ix_document_id'), table_name='document')
     op.drop_table('document')
     # ### end Alembic commands ###
diff --git a/alembic/versions/ce0f3c4dd625_company_column_users_table.py b/alembic/versions/ce0f3c4dd625_company_column_users_table.py
deleted file mode 100644
index 1dc0cc97..00000000
--- a/alembic/versions/ce0f3c4dd625_company_column_users_table.py
+++ /dev/null
@@ -1,34 +0,0 @@
-"""Company column  users table
-
-Revision ID: ce0f3c4dd625
-Revises: 488f28da0939
-Create Date: 2024-02-09 19:35:09.546805
-
-"""
-from typing import Sequence, Union
-
-from alembic import op
-import sqlalchemy as sa
-
-
-# revision identifiers, used by Alembic.
-revision: str = 'ce0f3c4dd625'
-down_revision: Union[str, None] = '488f28da0939'
-branch_labels: Union[str, Sequence[str], None] = None
-depends_on: Union[str, Sequence[str], None] = None
-
-
-def upgrade() -> None:
-    # ### commands auto generated by Alembic - please adjust! ###
-    # op.create_unique_constraint('unique_user_role', 'user_roles', ['user_id', 'role_id', 'company_id'])
-    op.add_column('users', sa.Column('company_id', sa.Integer(), nullable=True))
-    op.create_foreign_key(None, 'users', 'companies', ['company_id'], ['id'])
-    # ### end Alembic commands ###
-
-
-def downgrade() -> None:
-    # ### commands auto generated by Alembic - please adjust! ###
-    op.drop_constraint(None, 'users', type_='foreignkey')
-    op.drop_column('users', 'company_id')
-    # op.drop_constraint('unique_user_role', 'user_roles', type_='unique')
-    # ### end Alembic commands ###
diff --git a/private_gpt/users/api/v1/routers/auth.py b/private_gpt/users/api/v1/routers/auth.py
index b1ad79d4..e334e992 100644
--- a/private_gpt/users/api/v1/routers/auth.py
+++ b/private_gpt/users/api/v1/routers/auth.py
@@ -11,8 +11,9 @@ from private_gpt.users.core import security
 from private_gpt.users.constants.role import Role
 from private_gpt.users.core.config import settings
 from private_gpt.users import crud, models, schemas
-from private_gpt.users.utils import send_registration_email
+from private_gpt.users.utils import send_registration_email, Ldap
 
+LDAP_SERVER = settings.LDAP_SERVER
 
 router = APIRouter(prefix="/auth", tags=["auth"])
 
@@ -79,6 +80,13 @@ def login_access_token(
         raise HTTPException(
             status_code=400, detail="Incorrect email or password"
         )
+    
+    ldap = Ldap(LDAP_SERVER, form_data.username, form_data.password)
+    print("LDAP LOGIN:: ", ldap.who_am_i())
+    if not ldap:
+        raise HTTPException(
+            status_code=400, detail="Incorrect email or password"
+        )
     access_token_expires = timedelta(
         minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES
     )
@@ -97,7 +105,7 @@ def login_access_token(
         if user.user_role.company_id:
             company_id = user.user_role.company_id
         else: company_id = None
-
+    
     token_payload = {
         "id": str(user.id),
         "email": str(user.email),
diff --git a/private_gpt/users/core/config.py b/private_gpt/users/core/config.py
index 39eb981a..ebf21b46 100644
--- a/private_gpt/users/core/config.py
+++ b/private_gpt/users/core/config.py
@@ -8,7 +8,7 @@ SQLALCHEMY_DATABASE_URI = "postgresql+psycopg2://{username}:{password}@{host}:{p
     port='5432',
     db_name='QuickGpt',
     username='postgres',
-    password="quick",
+    password="admin",
 )
 
 class Settings(BaseSettings):
@@ -37,6 +37,7 @@ class Settings(BaseSettings):
     SMTP_USERNAME: str
     SMTP_PASSWORD: str
 
+    LDAP_SERVER: str
     @property
     def SQLALCHEMY_DATABASE_URI(self) -> str:
         return f"postgresql+psycopg2://{self.DB_USER}:{self.DB_PASSWORD}@{self.DB_HOST}:{self.DB_PORT}/{self.DB_NAME}"
diff --git a/private_gpt/users/crud/user_crud.py b/private_gpt/users/crud/user_crud.py
index 950d5a4e..8b08ee41 100644
--- a/private_gpt/users/crud/user_crud.py
+++ b/private_gpt/users/crud/user_crud.py
@@ -13,7 +13,7 @@ from sqlalchemy.orm import joinedload
 class CRUDUser(CRUDBase[User, UserCreate, UserUpdate]):
     def get_by_email(self, db: Session, *, email: str) -> Optional[User]:
         return db.query(self.model).filter(User.email == email).first()
-
+    
     def create(self, db: Session, *, obj_in: UserCreate) -> User:
         db_obj = User(
             email=obj_in.email,
diff --git a/private_gpt/users/models/user_role.py b/private_gpt/users/models/user_role.py
index 763d9972..9b51a127 100644
--- a/private_gpt/users/models/user_role.py
+++ b/private_gpt/users/models/user_role.py
@@ -20,7 +20,7 @@ class UserRole(Base):
         Integer,
         ForeignKey("companies.id"),
         primary_key=True,
-        nullable=True,
+        nullable=False,
     )
     role = relationship("Role")
     user = relationship("User", back_populates="user_role", uselist=False)
diff --git a/private_gpt/users/utils/__init__.py b/private_gpt/users/utils/__init__.py
index eb4eebb8..dc998124 100644
--- a/private_gpt/users/utils/__init__.py
+++ b/private_gpt/users/utils/__init__.py
@@ -1 +1,2 @@
-from .utils import send_registration_email
\ No newline at end of file
+from .utils import send_registration_email
+from .ad_auth import Ldap
\ No newline at end of file
diff --git a/private_gpt/users/utils/ad_auth.py b/private_gpt/users/utils/ad_auth.py
new file mode 100644
index 00000000..c71f73de
--- /dev/null
+++ b/private_gpt/users/utils/ad_auth.py
@@ -0,0 +1,14 @@
+import ldap3
+
+class Ldap:
+    """Class for LDAP related connections/operations."""
+
+    def __init__(self, server_uri, ldap_user, ldap_pass):
+        self.server = ldap3.Server(server_uri, get_info=ldap3.ALL)
+        print(f"Connected to ldap server: {self.server}")
+        self.conn = ldap3.Connection(self.server, user=ldap_user, password=ldap_pass, auto_bind=True)
+
+    def who_am_i(self):
+        return self.conn.extend.standard.who_am_i()
+
+    
\ No newline at end of file