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security_groups.tf
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security_groups.tf
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# Security group for bastion/jump host
resource "aws_security_group" "jumphost_sg" {
name = "jumphost-SG"
description = "Allow inbound SSH traffic for jumphost"
vpc_id = aws_vpc.project_vpc.id
}
# Allow SSH to bastion/jump host (ideally, access should be restricted to trusted IPs only)
resource "aws_security_group_rule" "jumphost_ssh_rule" {
security_group_id = aws_security_group.jumphost_sg.id
type = "ingress"
from_port = 22
to_port = 22
protocol = "tcp"
cidr_blocks = ["0.0.0.0/0"]
}
# Allow outbound traffic
resource "aws_security_group_rule" "jumphost_outbound_rule" {
security_group_id = aws_security_group.jumphost_sg.id
type = "egress"
from_port = 0
to_port = 0
protocol = "-1"
cidr_blocks = ["0.0.0.0/0"]
}
# --------------------------------------------------
# Security group for elastic file system
resource "aws_security_group" "efs_sg" {
name = "efs-access"
description = "Allow NFS traffic"
vpc_id = aws_vpc.project_vpc.id
}
resource "aws_security_group_rule" "nfs_rule" {
security_group_id = aws_security_group.efs_sg.id
type = "ingress"
from_port = 2049
to_port = 2049
protocol = "tcp"
source_security_group_id = aws_security_group.efs_sg.id
}
# Allow outbound traffic
resource "aws_security_group_rule" "efs_outbound_rule" {
security_group_id = aws_security_group.efs_sg.id
type = "egress"
from_port = 0
to_port = 0
protocol = "-1"
cidr_blocks = ["0.0.0.0/0"]
}
# -------------------------------------------------
# Security group for load balancer
resource "aws_security_group" "alb_sg" {
name = "alb-SG"
description = "Allow HTTP(S) traffic for load balancer"
vpc_id = aws_vpc.project_vpc.id
}
# Allow HTTP & HTTPS traffic to load balancer
resource "aws_security_group_rule" "alb_HTTP_rule" {
security_group_id = aws_security_group.alb_sg.id
type = "ingress"
from_port = 80
to_port = 80
protocol = "tcp"
cidr_blocks = ["0.0.0.0/0"]
}
resource "aws_security_group_rule" "alb_HTTPS_rule" {
security_group_id = aws_security_group.alb_sg.id
type = "ingress"
from_port = 443
to_port = 443
protocol = "tcp"
cidr_blocks = ["0.0.0.0/0"]
}
# Allow outbound traffic
resource "aws_security_group_rule" "alb_outbound_rule" {
security_group_id = aws_security_group.alb_sg.id
type = "egress"
from_port = 0
to_port = 0
protocol = "-1"
cidr_blocks = ["0.0.0.0/0"]
}
# ---------------------------------------------
# Security group for application servers
resource "aws_security_group" "app_server_sg" {
name = "app-server-SG"
description = "Allow SSH & Internet traffic for instances in application tier"
vpc_id = aws_vpc.project_vpc.id
}
# Give jumphost SSH access to application servers
resource "aws_security_group_rule" "app_server_ssh_rule" {
security_group_id = aws_security_group.app_server_sg.id
type = "ingress"
from_port = 22
to_port = 22
protocol = "tcp"
source_security_group_id = aws_security_group.jumphost_sg.id
}
# Give load balancer HTTP & HTTPS access to application servers
resource "aws_security_group_rule" "app_server_alb_HTTP_rule" {
security_group_id = aws_security_group.app_server_sg.id
type = "ingress"
from_port = 80
to_port = 80
protocol = "tcp"
source_security_group_id = aws_security_group.alb_sg.id
}
resource "aws_security_group_rule" "app_server_alb_HTTPS_rule" {
security_group_id = aws_security_group.app_server_sg.id
type = "ingress"
from_port = 443
to_port = 443
protocol = "tcp"
source_security_group_id = aws_security_group.alb_sg.id
}
# Allow outbound traffic
resource "aws_security_group_rule" "app_server_outbound_rule" {
security_group_id = aws_security_group.app_server_sg.id
type = "egress"
from_port = 0
to_port = 0
protocol = "-1"
cidr_blocks = ["0.0.0.0/0"]
}
# -------------------------------
# Security group for database servers
resource "aws_security_group" "db_server_sg" {
name = "db-server-SG"
description = "Allow inbound SSH traffic for instances in database tier"
vpc_id = aws_vpc.project_vpc.id
}
# Give application servers access to database servers
resource "aws_security_group_rule" "db_server_mysql_rule" {
security_group_id = aws_security_group.db_server_sg.id
type = "ingress"
from_port = 3306
to_port = 3306
protocol = "tcp"
source_security_group_id = aws_security_group.app_server_sg.id
}
# Allow outbound traffic
resource "aws_security_group_rule" "db_server_outbound_rule" {
security_group_id = aws_security_group.db_server_sg.id
type = "egress"
from_port = 0
to_port = 0
protocol = "-1"
cidr_blocks = ["0.0.0.0/0"]
}