Python-WebApp_Terraform/sg.tf at main · Damdev-95/Python-WebApp_Terraform · GitHub

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# elb security group

resource "aws_security_group" "elb-sg" {
  name        = "elb_sg"
  description = "Used for the load balancer"

  vpc_id = aws_vpc.PythonAPP.id

  # HTTP access from anywhere
  ingress {
    from_port   = 80
    to_port     = 80
    protocol    = "tcp"
    cidr_blocks = ["0.0.0.0/0"]
  }

  # outbound internet access
  egress {
    from_port   = 0
    to_port     = 0
    protocol    = "-1"
    cidr_blocks = ["0.0.0.0/0"]
  }

  # ensure the VPC has an Internet gateway or this step will fail
  depends_on = [aws_internet_gateway.igw]
}

# bastion security
resource "aws_security_group" "bastion_sg" {
  name        = "bastion_sg"
  vpc_id      = aws_vpc.PythonAPP.id
  description = "Allow remote SSH connections."

  ingress {
    description = "SSH"
    from_port   = 22
    to_port     = 22
    protocol    = "tcp"
    cidr_blocks = ["0.0.0.0/0"]
  }

  egress {
    from_port   = 0
    to_port     = 0
    protocol    = "-1"
    cidr_blocks = ["0.0.0.0/0"]
  }

  tags = {
    Name = format("%s-Bastion-SG", var.name)
  }
}

resource "aws_security_group" "webserver-sg" {
  name   = "web-sg"
  vpc_id = aws_vpc.PythonAPP.id

  egress {
    from_port   = 0
    to_port     = 0
    protocol    = "-1"
    cidr_blocks = ["0.0.0.0/0"]
  }

  tags = {
    Name = format("%s-webserver-sg", var.name)
  }
}

resource "aws_security_group_rule" "inbound-app-http" {
  type                     = "ingress"
  from_port                = 8000
  to_port                  = 8000
  protocol                 = "tcp"
  source_security_group_id = aws_security_group.elb-sg.id
  security_group_id        = aws_security_group.webserver-sg.id
}

resource "aws_security_group_rule" "inbound-web-ssh" {
  type                     = "ingress"
  from_port                = 22
  to_port                  = 22
  protocol                 = "tcp"
  source_security_group_id = aws_security_group.bastion_sg.id
  security_group_id        = aws_security_group.webserver-sg.id
}