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sg.tf
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############# Web Server Security group ####################################################################################
resource "aws_security_group" "web" {
name = "web_server-SG"
description = "Allow web traffic"
vpc_id = aws_vpc.this.id
dynamic "ingress" {
for_each = var.inbound_rules_web
content {
description = ingress.value.description
protocol = ingress.value.protocol
from_port = ingress.value.port
to_port = ingress.value.port
security_groups = ingress.value.port == 22 ? [aws_security_group.bastion_host.id] : [aws_security_group.lb_sg.id]
}
}
egress {
from_port = 0
to_port = 0
protocol = "-1"
cidr_blocks = ["0.0.0.0/0"]
}
tags = {
Name = "web_server-sg-allow"
}
}
############# Bastion Host Security group ################################################################################################
resource "aws_security_group" "bastion_host" {
name = "Bastion-Host-SG"
description = "Allow ssh traffic into private subnet resource using this"
vpc_id = aws_vpc.this.id
ingress {
description = "Allow ssh to bastion host from anywhere"
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 = "bastion-host-sg-allow"
}
}
############# Application Server Security Group ####################################################################################
resource "aws_security_group" "application_server" {
name = "allow_application_traffic"
vpc_id = aws_vpc.this.id
dynamic "ingress" {
for_each = var.inbound_rules_application
content {
description = ingress.value.description
protocol = ingress.value.protocol
from_port = ingress.value.port
to_port = ingress.value.port
security_groups = ingress.value.port == 22 ? [aws_security_group.bastion_host.id] : [aws_security_group.web.id, aws_security_group.lambda_function.id]
}
}
egress {
from_port = 0
to_port = 0
protocol = "-1"
cidr_blocks = ["0.0.0.0/0"]
}
tags = {
Name = "allow_app_server"
}
}
############# Application Load Balancer Security Group ####################################################################################
resource "aws_security_group" "lb_sg" {
name = "allow_lb"
description = "Allow access to load balancer from internet"
vpc_id = aws_vpc.this.id
ingress {
description = "Allow access to load balancer from internet"
from_port = 80
to_port = 80
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 = "allow_alb_sg"
}
}
############# RDS Security Group ####################################################################################
resource "aws_security_group" "db_sg" {
name = "allow_db"
description = "Allow access to db from app server"
vpc_id = aws_vpc.this.id
ingress {
description = "Allow access to db from app server"
from_port = 3306
to_port = 3306
protocol = "tcp"
security_groups = [aws_security_group.application_server.id]
}
egress {
from_port = 0
to_port = 0
protocol = "-1"
cidr_blocks = ["0.0.0.0/0"]
}
tags = {
Name = "allow_db_sg"
}
}
############# Lambda Fuction Security group ################################################################################################
resource "aws_security_group" "lambda_function" {
name = "lambda-function-security-group"
description = "Security group for Lambda function"
vpc_id = aws_vpc.this.id
ingress {
description = "Allow ssh to lambda_fuction from anywhere"
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 = "lambda_fuction-sg-allow"
}
}