Avni

projects/bash_networking_security/SOLUTION

@@ -1,16 +1,22 @@
 Local DNS Server IP
 -------------------
-<ip-here>
+<ip-here>-127.0.0.53
 
 
 
 Default gateway IP
 -------------------
-<ip-here>
+<10.0.0.1>
 
 
 
 DHCP IP allocation sys-logs
 -------------------
 <logs-here>
+<Jun 11 18:51:25 ip-10-0-0-177 dhclient[347]: Internet Systems Consortium DHCP Client 4.4.1
+Jun 11 18:51:25 ip-10-0-0-177 dhclient[347]: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 3 (xid=0xacdc536e)
+Jun 11 18:51:25 ip-10-0-0-177 dhclient[347]: DHCPOFFER of 10.0.0.177 from 10.0.0.1
+Jun 11 18:51:25 ip-10-0-0-177 dhclient[347]: DHCPREQUEST for 10.0.0.177 on eth0 to 255.255.255.255 port 67 (xid=0x6e53dcac)
+Jun 11 18:51:25 ip-10-0-0-177 dhclient[347]: DHCPACK of 10.0.0.177 from 10.0.0.1 (xid=0xacdc536e)
+Jun 11 18:51:25 ip-10-0-0-177 systemd-networkd[382]: eth0: DHCPv4 address 10.0.0.177/24 via 10.0.0.>
 

projects/bash_networking_security/bastion_connect.sh

@@ -1 +1,22 @@
 #!/bin/bash
+#i
+if [[ -z "$KEY_PATH" ]]; then
+  echo "Error: KEY_PATH environment variable is not set."
+  exit 5
+fi
+
+if [[ $# -lt 1 ]]; then
+  echo "KEY_PATH env var is expected"
+  echo "Please provide bastion IP address"
+  exit 5
+fi
+
+bastion_ip=$1
+private_ip=$2
+command_to_run="${@:3}"
+
+if [[ -n "$private_ip" ]]; then
+  ssh -t -i "$KEY_PATH" ubuntu@"$bastion_ip" ssh -i "vidpri-key.pem" ubuntu@"$private_ip" "$command_to_run"
+else
+  ssh -i "$KEY_PATH" ubuntu@"$bastion_ip" "$command_to_run"
+fi

projects/bash_networking_security/tlsHandshake.sh

@@ -1 +1,48 @@
-#!/bin/bash
+#!/bin/bash -x
+# Step 1 - Client Hello (Client -> Server)
+RESPONSE=$(curl -X POST -H "Content-Type: application/json" -d '{
+   "version": "1.3",
+   "ciphersSuites": ["TLS_AES_128_GCM_SHA256", "TLS_CHACHA20_POLY1305_SHA256"],
+   "message": "Client Hello"
+}' http://16.170.234.56:8080/clienthello)
+
+# Step 2 - Server Hello (Server -> Client)
+SESSION_ID=$(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://16.170.234.56:8080/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-1"
+VPC_ID="vpc-0da47383de0ba257e"
+PUBLIC_INSTANCE_ID="i-016c56b2fc4e6f7f9"
+PRIVATE_INSTANCE_ID="i-0520e3ace53a56df6"