commited

projects/bash_networking_security/SOLUTION

@@ -1,16 +1,20 @@
 Local DNS Server IP
 -------------------
-<ip-here>
+<127.0.0.53>
 
 
 
 Default gateway IP
 -------------------
-<ip-here>
+<10.0.0.1>
 
 
 
 DHCP IP allocation sys-logs
 -------------------
-<logs-here>
-
+Jun 13 18:25:55 ip-10-0-0-200 dhclient[347]: Internet Systems Consortium DHCP Client 4.4.1
+Jun 13 18:25:55 ip-10-0-0-200 dhclient[347]: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 3 (xid=0x59d92d2b)
+Jun 13 18:25:55 ip-10-0-0-200 dhclient[347]: DHCPOFFER of 10.0.0.200 from 10.0.0.1
+Jun 13 18:25:55 ip-10-0-0-200 dhclient[347]: DHCPREQUEST for 10.0.0.200 on eth0 to 255.255.255.255 port 67 (xid=0x2b2dd959)
+Jun 13 18:25:55 ip-10-0-0-200 dhclient[347]: DHCPACK of 10.0.0.200 from 10.0.0.1 (xid=0x59d92d2b)
+Jun 13 18:25:55 ip-10-0-0-200 systemd-networkd[382]: eth0: DHCPv4 address 10.0.0.200/24 via 10.0.0.1

projects/bash_networking_security/bastion_connect.sh

@@ -1 +1,24 @@
 #!/bin/bash
+
+#hello
+if [ -z "$KEY_PATH" ]; then
+    echo "KEY_PATH env var is expected"
+    exit 5
+fi
+
+public_instance_ip="$1"
+private_instance_ip="$2"
+command="$3"
+
+if [ -z "$public_instance_ip" ]; then
+    echo "Please provide bastion IP address"
+    exit 5
+fi
+
+if [ -z "$private_instance_ip" ]; then
+   	ssh -i "$KEY_PATH" ubuntu@"$public_instance_ip"
+elif [ -z "$command" ]; then
+    ssh -i "$KEY_PATH" ubuntu@"$public_instance_ip" ssh -t -t -i "~/new_key" ubuntu@"$private_instance_ip"
+else 
+	ssh -i "$KEY_PATH" ubuntu@"$public_instance_ip" ssh -t -t -i "~/new_key" ubuntu@"$private_instance_ip" "$command"
+fi

projects/bash_networking_security/tlsHandshake.sh

@@ -1 +1,53 @@
 #!/bin/bash
+
+# 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-092bd5f1923632b3e"
+PUBLIC_INSTANCE_ID="i-00b52ff0e8d5652f9"
+PRIVATE_INSTANCE_ID="i-0bf302033dcfefa1c"