Networking ex/aakshita

projects/bash_networking_security/SOLUTION

@@ -1,16 +1,17 @@
 Local DNS Server IP
 -------------------
-<ip-here>
-
+10.0.0.2
 
 
 Default gateway IP
 -------------------
-<ip-here>
-
+10.0.0.1
 
 
 DHCP IP allocation sys-logs
 -------------------
-<logs-here>
+DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 3 (xid=0x54c05365)
+DHCPOFFER of 10.0.0.176 from 10.0.0.1
+DHCPREQUEST for 10.0.0.176 on eth0 to 255.255.255.255 port 67 (xid=0x6553c054)
+DHCPACK of 10.0.0.176 from 10.0.0.1 (xid=0x54c05365)
 

projects/bash_networking_security/bastion_connect.sh

@@ -1 +1,23 @@
 #!/bin/bash
+# Check if KEY_PATH environment variable exists
+if [[ -z "$KEY_PATH" ]]; then
+    echo "KEY_PATH env var is expected"
+    exit 5
+fi
+# Check if the public instance IP address is provided
+if [[ $# -lt 1 ]]; then
+    echo "Please provide bastion IP address"
+    exit 1
+fi
+# Connect to the private instance using the public instance as a bastion host
+if [[ $# -eq 2 ]]; then
+    public_instance_ip=$1
+    private_instance_ip=$2
+
+    # Connect to the private instance via the bastion host
+    ssh -i "$KEY_PATH" ubuntu@"$public_instance_ip" ssh -t -t -i "/home/keys/aakshita-kp-pvt.pem" ubuntu@"$private_instance_ip"
+else
+    public_instance_ip=$1
+    # Connect to the public instance
+    ssh -i "$KEY_PATH" ubuntu@"$public_instance_ip" 
+fi

projects/bash_networking_security/tlsHandshake.sh

@@ -1 +1,52 @@
-#!/bin/bash
+#!/bin/bash -x
+# Step 1 - Client Hello (Client -> Server)
+RESPONSE=$(curl -X POST -H "Content-Type: application/json" -d '{
+   "version": "1.3",
+   "ciphersSuites": ["TLS_AES_128_GCM_SHA256", "TLS_CHACHA20_POLY1305_SHA256"],
+   "message": "Client Hello"
+}' http://3.129.7.39:8080/clienthello)
+
+
+# Step 2 - Server Hello (Server -> Client)
+SESSION_ID=$(jq -r '.sessionID' <<< "$RESPONSE")
+
+echo "$RESPONSE" | jq -r '.serverCert' > cert.pem
+
+
+# Step 3 - Server Certificate Verification
+wget https://devops-feb23.s3.eu-north-1.amazonaws.com/cert-ca-aws.pem -O cert-ca-aws.pem
+
+VERIFICATION=$(openssl verify -CAfile cert-ca-aws.pem cert.pem)
+
+if [ "$VERIFICATION" != "cert.pem: OK" ]; then
+  echo "Server Certificate is invalid"
+  exit 5
+fi
+
+
+# Step 4 - Client-Server master-key exchange
+openssl rand -out masterKey.txt -base64 32
+
+MASTER_KEY=$(openssl smime -encrypt -aes-256-cbc -in masterKey.txt -outform DER cert.pem | base64 -w 0)
+
+
+# Step 5 - Server verification message
+RESPONSE=$(curl -X POST -H "Content-Type: application/json" -d '{
+  "sessionID": "'"$SESSION_ID"'",
+  "masterKey": "'"$MASTER_KEY"'",
+  "sampleMessage": "Hi server, please encrypt me and send to client!"
+}' http://3.129.7.39:8080/keyexchange)
+
+
+# Step 6 - Client verification message
+echo "$RESPONSE" | jq -r '.encryptedSampleMessage' > encSampleMsg.txt
+cat encSampleMsg.txt | base64 -d > encSampleMsgReady.txt
+
+decrypted_sample_msg=$(openssl enc -d -aes-256-cbc -pbkdf2 -kfile masterKey.txt -in encSampleMsgReady.txt)
+
+if [ "$decrypted_sample_msg" != "Hi server, please encrypt me and send to client!" ]; then
+  echo "Server symmetric encryption using the exchanged master-key has failed."
+  exit 6
+else
+  echo "Client-Server TLS handshake has been completed successfully"
+fi

projects/bash_networking_security/vpc.sh

@@ -1,4 +1,4 @@
-REGION=""
-VPC_ID=""
-PUBLIC_INSTANCE_ID=""
-PRIVATE_INSTANCE_ID=""
+REGION="us-east-2"
+VPC_ID="vpc-0877ccfe93bc02d87"
+PUBLIC_INSTANCE_ID="i-0b8a7f68dfbcedf46"
+PRIVATE_INSTANCE_ID="i-0fbcb766ffa9fb760"

simple_flask_webserver/Dockerfile

@@ -0,0 +1,6 @@
+FROM python:3.8.12-slim-buster
+WORKDIR /app
+COPY . .
+RUN pip install -r requirements.txt
+CMD ["python3","app.py"]
+