Attaching SSL certificate to AWS Elastic BeanStalk's single instance environment

Step 1:

Create a ssl certificate

Go to this link to create a free ssl certificate

Create folders .well-known > acme-challenge and put the file which you got while creating a ssl above eg. 2elaFuIeUlvdNUGhnGa3A4NLSPYM21AyK7uHHZNc_s0

The website will need to confirm that you are the legitimate user of the domain for which you are claiming the ssl certificate. To verify, you can go to your node server and add

app.get('/.well-known/acme-challenge/2elaFuIeUlvdNUGhnGa3A4NLSPYM21AyK7uHHZNc_s0', function (req, res) {
    res.sendFile(__dirname + '/.well-known/acme-challenge/2elaFuIeUlvdNUGhnGa3A4NLSPYM21AyK7uHHZNc_s0');
});

Download the certificates

Step 2:

Upload the ssl certificate to EBS environment

Create a folder .ebextensions

Inside this folder, create a file called https-instance.config and put the following contents

Resources:
  sslSecurityGroupIngress: 
    Type: AWS::EC2::SecurityGroupIngress
    Properties:
      GroupId: {"Fn::GetAtt" : ["AWSEBSecurityGroup", "GroupId"]}
      IpProtocol: tcp
      ToPort: 443
      FromPort: 443
      CidrIp: 0.0.0.0/0
      
files:
  /etc/nginx/conf.d/https.conf:
    mode: "000644"
    owner: root
    group: root
    content: |
      # HTTPS server

      server {
          listen       443;
          server_name  localhost;
          
          ssl                  on;
          ssl_certificate      /etc/pki/tls/certs/server.crt;
          ssl_certificate_key  /etc/pki/tls/certs/server.key;
          
          ssl_session_timeout  5m;
          
          ssl_protocols  TLSv1 TLSv1.1 TLSv1.2;
          ssl_ciphers "EECDH+AESGCM:EDH+AESGCM:AES256+EECDH:AES256+EDH";
          ssl_prefer_server_ciphers   on;
          
          location / {
              proxy_pass  http://nodejs;
              proxy_set_header   Connection "";
              proxy_http_version 1.1;
              proxy_set_header        Host            $host;
              proxy_set_header        X-Real-IP       $remote_addr;
              proxy_set_header        X-Forwarded-For $proxy_add_x_forwarded_for;
          }
      }
  /etc/nginx/conf.d/000_my_config.conf:
    mode: "000755"
    owner: root
    owner: root
    content: |
      server {
          listen 8080;
          return 301 https://$host$request_uri;
      }
  /etc/pki/tls/certs/server.crt:
    mode: "000400"
    owner: root
    group: root
    content: |
      -----BEGIN CERTIFICATE-----
      *your certificate*
      -----END CERTIFICATE-----
      
  /etc/pki/tls/certs/server.key:
    mode: "000400"
    owner: root
    group: root
    content: |
      -----BEGIN RSA PRIVATE KEY-----
      *your private key*
      -----END RSA PRIVATE KEY-----

Replace the certificate and private key in above file and zip the application and upload to beanstalk environment and you are done

Security:

For security reasons you can upload the private key to aws s3 bucket and add the following snippet of code to grant EBS's instance to access the bucket to read the private key.

Resources:
  AWSEBAutoScalingGroup:
    Metadata:
      AWS::CloudFormation::Authentication:
        S3Auth:
          type: "s3"
          buckets: ["elasticbeanstalk-us-east-1-xxxxxxxxxxx"]
          roleName: 
            "Fn::GetOptionSetting": 
              Namespace: "aws:autoscaling:launchconfiguration"
              OptionName: "IamInstanceProfile"
              DefaultValue: "aws-elasticbeanstalk-ec2-role" 
              
  files:
    /etc/pki/tls/certs/server.key:
      mode: "000400"
      owner: root
      group: root
      source: https://s3.amazonaws.com/elasticbeanstalk-us-east-1-xxxxxxxxxx/server.key

Sources:

• sslforfree - create your free ssl certificate
• AWS documentation