Security for Elastic Stack (#196)

2019-07-08 14:02:19 +02:00
parent d98ab1b4f3
commit 065b5bb5cf
21 changed files with 956 additions and 211 deletions
@@ -0,0 +1,111 @@
+#!/bin/bash
+# Wazuh App Copyright (C) 2019 Wazuh Inc. (License GPLv2)
+
+elastic_config_file="/usr/share/elasticsearch/config/elasticsearch.yml"
+
+##############################################################################
+# Setup bootstrap password to chagne all Elastic Stack passwords.
+# Set xpack.security.enabled to true. In Elastic 7 must add ssl options
+##############################################################################
+
+if [[ $SECURITY_ENABLED == "yes" ]]; then
+
+  echo "Creating certificate."
+
+  pushd /usr/share/elasticsearch/config/
+
+  echo "Setting configuration options."
+
+  # Create instances.yml for elasticsearch .p12 certificate and key
+  echo "
+instances:
+- name: \"elasticsearch\"
+  dns: 
+    - $SECURITY_CERTIFICATE_DNS
+" > instances.yml
+
+  # Change permissions and owner of ca
+  chown elasticsearch: /usr/share/elasticsearch/config/$SECURITY_CA_PEM
+  chmod 440 /usr/share/elasticsearch/config/$SECURITY_CA_PEM
+ 
+
+  # Genereate .p12 certificate and key
+  SECURITY_KEY_PASSPHRASE=`date +%s | sha256sum | base64 | head -c 32 ; echo`
+  /usr/share/elasticsearch/bin/elasticsearch-certutil csr --in instances.yml --out certs.zip --pass $SECURITY_KEY_PASSPHRASE
+  unzip certs.zip
+  rm certs.zip 
+
+  # Change permissions and owner of certificates
+  chown -R elasticsearch: /usr/share/elasticsearch/config/elasticsearch
+  chmod -R 770 /usr/share/elasticsearch/config/elasticsearch
+  chmod 400 /usr/share/elasticsearch/config/elasticsearch/elasticsearch.csr
+
+  # Prepare directories for openssl
+  mkdir /root/ca
+  mkdir /root/ca/certs /root/ca/crl /root/ca/newcerts /root/ca/private
+  chmod 700 /root/ca/private
+  touch /root/ca/index.txt
+  echo 1000 > /root/ca/serial
+
+  mkdir /root/ca/intermediate
+  mkdir /root/ca/intermediate/certs /root/ca/intermediate/crl /root/ca/intermediate/csr /root/ca/intermediate/newcerts /root/ca/intermediate/private
+  chmod 700 /root/ca/intermediate/private
+  touch /root/ca/intermediate/index.txt
+  echo 1000 > /root/ca/intermediate/serial
+  echo 1000 > /root/ca/intermediate/crlnumber
+
+  if [[ "x${SECURITY_CREDENTIALS_FILE}" == "x" ]]; then
+
+    openssl ca -batch -config $SECURITY_OPENSSL_CONF  -in elasticsearch/elasticsearch.csr -cert $SECURITY_CA_PEM  -keyfile $SECURITY_CA_KEY  -key $SECURITY_CA_PASSPHRASE -out elasticsearch.cert.pem
+  
+  else
+    input=${SECURITY_CREDENTIALS_FILE}
+    CA_PASSPHRASE_FROM_FILE=""
+    while IFS= read -r line
+    do
+      if [[ $line == *"CA_PASSPHRASE"* ]]; then
+        arrIN=(${line//:/ })
+        CA_PASSPHRASE_FROM_FILE=${arrIN[1]}
+      fi
+    done < "$input"
+    
+    openssl ca -batch -config $SECURITY_OPENSSL_CONF  -in elasticsearch/elasticsearch.csr -cert $SECURITY_CA_PEM  -keyfile $SECURITY_CA_KEY  -key $CA_PASSPHRASE_FROM_FILE -out elasticsearch.cert.pem 
+  
+  fi
+  
+  chmod 440 /usr/share/elasticsearch/config/elasticsearch.cert.pem
+
+  # remove CA key
+  rm $SECURITY_CA_KEY
+
+  popd
+
+  echo "Setting configuration options."
+  
+  # Settings for elasticsearch.yml
+  echo "
+# Required to set the passwords and TLS options
+xpack.security.enabled: true
+xpack.security.transport.ssl.enabled: true
+xpack.security.transport.ssl.verification_mode: certificate
+xpack.security.transport.ssl.key: /usr/share/elasticsearch/config/elasticsearch/elasticsearch.key
+xpack.security.transport.ssl.certificate: /usr/share/elasticsearch/config/elasticsearch.cert.pem
+xpack.security.transport.ssl.certificate_authorities: [\"/usr/share/elasticsearch/config/$SECURITY_CA_TRUST\"]
+
+# HTTP layer
+xpack.security.http.ssl.enabled: true
+xpack.security.http.ssl.verification_mode: certificate
+xpack.security.http.ssl.key: /usr/share/elasticsearch/config/elasticsearch/elasticsearch.key
+xpack.security.http.ssl.certificate: /usr/share/elasticsearch/config/elasticsearch.cert.pem
+xpack.security.http.ssl.certificate_authorities: [\"/usr/share/elasticsearch/config/$SECURITY_CA_TRUST\"]
+" >> $elastic_config_file
+
+  # Create keystore
+  /usr/share/elasticsearch/bin/elasticsearch-keystore create
+
+  # Add keys to keystore
+  echo -e "$SECURITY_KEY_PASSPHRASE" | /usr/share/elasticsearch/bin/elasticsearch-keystore add xpack.security.transport.ssl.secure_key_passphrase --stdin
+  echo -e "$SECURITY_KEY_PASSPHRASE" | /usr/share/elasticsearch/bin/elasticsearch-keystore add xpack.security.http.ssl.secure_key_passphrase --stdin
+
+fi
+