Provide a valid SSL certificate for the connection between Splunk Phantom and Splunk Enterprise

By default, the connection between Splunk Phantom and Splunk Enterprise or Splunk Cloud requires a valid SSL certificate. Splunk Phantom generates a self-signed certificate when it is installed. When a web browser requests a connection to Splunk Phantom, Splunk Enterprise, or Splunk Cloud, HTTPS validation fails because the self-signed certificate is not issued by a valid Certificate Authority.

You can manage your HTTPS certificate validation on Splunk Enterprise by using one of the following methods to provide a valid SSL certificate, in order of preference:

1. Use a valid certificate signed by a Certificate Authority.
2. Add a public key to your Splunk Enterprise instance.
3. Manage HTTPS certificate validation using configuration files.
4. Manage HTTPS certificate validation using the REST API.

Disable certificate verification only in development or test environments. Do not disable certificate verification in a production system. If you are a Splunk Cloud user, contact support with your certificate bundle.

Use a valid certificate signed by a Certificate Authority

Perform the following tasks to replace the default self-signed certificate in Splunk Phantom with a valid certificate signed by a Certificate Authority.

1. Back up the existing self-signed certificate files in the following locations:

   /opt/phantom/etc/ssl/certs/httpd_cert.crt
   /opt/phantom/etc/ssl/private/httpd_cert.key
   

2. Replace the existing certificate files with your new files, in the same location. If you choose to use a different location, edit the /etc/nginx/conf.d/default.conf file to point to the appropriate location.

   If you modify the Nginx configuration, it may be overwritten when Splunk Phantom is upgraded.

3. If you are using a commercial certificate authority, you will be given one or intermediate certificates to go along with your server certificate. You must add the intermediates into the httpd_cert.crt file. To do so, append the lines from the intermediate certificates to the server certificate file. Once the intermediate certificates have been added, your httpd_cert.crt will look something like this:

   [root@localhost certs]# pwd
   /opt/phantom/etc/ssl/certs
   [root@localhost certs]# cat httpd_cert.crt 
   -----BEGIN CERTIFICATE-----
   MIIGBzCCA++gAwIBAgICEAAwDQYJKoZIhvcNAQELBQAwgZAxCzAJBgNVBAYTAlVT
   MRMwEQYDVQQIDApDYWxpZm9ybmlhMSIwIAYDVQQKDBlQaGFudG9tIEN5YmVyIENv
   cnBvcmF0aW9uMRQwEgYDVQQLDAtFbmdpbmVlcmluZzEyMDAGA1UEAwwpUGhhbnRv
   bSBDeWJlciBDb3Jwb3JhdGlvbiBJbnRlcm1lZGlhdGUgQ0EwHhcNMTYwNjAyMDI0
   MzI2WhcNMjEwNjAxMDI0MzI2WjCBjzELMAkGA1UEBhMCVVMxEzARBgNVBAgMCkNh
   bGlmb3JuaWExEjAQBgNVBAcMCVBhbG8gQWx0bzEiMCAGA1UECgwZUGhhbnRvbSBD
   eWJlciBDb3Jwb3JhdGlvbjEUMBIGA1UECwwLRW5naW5lZXJpbmcxHTAbBgNVBAMM
   FG15cGhhbnRvbS5waGFudG9tLnVzMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIB
   CgKCAQEAyFBqOJqtJrRM/kmOOVGmRm9DtaGlxfNCsmOMhpyR//ju025ibaoYiQRr
   BqbNhsmDZuzSAIqxkO1fwYw3LBLmsrFqtc3wwO5PDXl8fKGN49iYWzG5N5RtU0Nv
   9r/iCsGDM0tjnUxQaGpl3CNTil6qKKO+Xb2KeNKBM4xP9bwRzkQ9bBK9aIMd1f/y
   DquWNvgxkcofhS6Dicp3fySOym96Eb2GdBH9C3cYuPmBeqvOgj/OUidItLwL12oV
   0AaXKWC5HLYODqLGvfXtaw6c29mz/RM5UnI+/U+EErngypFhQD9a9ZbEAChCCZFo
   vUxF/ufk1C2RHvw32xjU69j52YQKnwIDAQABo4IBaDCCAWQwCQYDVR0TBAIwADAR
   BglghkgBhvhCAQEEBAMCBkAwMwYJYIZIAYb4QgENBCYWJE9wZW5TU0wgR2VuZXJh
   dGVkIFNlcnZlciBDZXJ0aWZpY2F0ZTAdBgNVHQ4EFgQUJ4hpYjyWbPPoUoa6pe2A
   vAUz5ScwgcoGA1UdIwSBwjCBv4AU46v2CJIQGDXu1FB6M9lKbsoUDRKhgaKkgZ8w
   gZwxCzAJBgNVBAYTAlVTMRMwEQYDVQQIDApDYWxpZm9ybmlhMRIwEAYDVQQHDAlQ
   YWxvIEFsdG8xIjAgBgNVBAoMGVBoYW50b20gQ3liZXIgQ29ycG9yYXRpb24xFDAS
   BgNVBAsMC0VuZ2luZWVyaW5nMSowKAYDVQQDDCFQaGFudG9tIEN5YmVyIENvcnBv
   cmF0aW9uIFJvb3QgQ0GCAhAAMA4GA1UdDwEB/wQEAwIFoDATBgNVHSUEDDAKBggr
   BgEFBQcDATANBgkqhkiG9w0BAQsFAAOCAgEA5kdSwVQMHjCIQvyjOQsflPOcj2zS
   t0IWVp4OmDipJ+MYm4+bHvsw3OxBb3fWx4W7S249dbTNoTPqPlCoLLlv8mshTwF4
   nZJksLz5D40rtqrtYT1g3d1rDURz8rANP9MqHUpkXKETg9ufNwprWAdFYfd/IQw8
   e547k0Wy60NRb1rowI7hIOc/egqRU6WjQ5ygmCblHmoL9AK6Jh03tXS6maPrbSRt
   9Nkf/iPbkz8m7kOR1OUbq9/YXaNI6LECOYsI+ML8iy1ddPIGg+eNce3Lg47Q/rpY
   3Y+w1KHoticeetKvJn+mzxLiGXVEUik/Mm5eniJGMCa5bMO31xH5TXcouOE554u6
   gcACjeaTz/KYQ8TnMTAaJIG9GIvclao4xYA705LPMHHeEF5fQXRnJqSZ9i1tqWZQ
   EOFJ5RhJSJuf0j4P+4fpZOxV3wZJlvE6Ts3s2m2Iws+WLZSYAHlpVLUKuk2vxvrO
   v44syOGi80f/zPWAy4u0NrNSBMCCIv9VElJ+9azCjOW349murPZeymOWGM/A9HbU
   DH00pogNlUHHiZB+X9tKktFGAI2qZXHE13fRlmNbblAKepQdCNEo/Cji5sDXKacG
   7HaBZlQZiX9u2pOYtLZHSyCgfThtKv3DzmOFtER1BMDeiRffUcjGvMKErjU1SLeE
   FqZLl+YJqmQ7sZM=
   -----END CERTIFICATE-----
   -----BEGIN CERTIFICATE-----
   MIIGEDCCA/igAwIBAgICEAAwDQYJKoZIhvcNAQELBQAwgZwxCzAJBgNVBAYTAlVT
   MRMwEQYDVQQIDApDYWxpZm9ybmlhMRIwEAYDVQQHDAlQYWxvIEFsdG8xIjAgBgNV
   BAoMGVBoYW50b20gQ3liZXIgQ29ycG9yYXRpb24xFDASBgNVBAsMC0VuZ2luZWVy
   aW5nMSowKAYDVQQDDCFQaGFudG9tIEN5YmVyIENvcnBvcmF0aW9uIFJvb3QgQ0Ew
   HhcNMTYwNjAxMjM0ODA4WhcNMjYwNTMwMjM0ODA4WjCBkDELMAkGA1UEBhMCVVMx
   EzARBgNVBAgMCkNhbGlmb3JuaWExIjAgBgNVBAoMGVBoYW50b20gQ3liZXIgQ29y
   cG9yYXRpb24xFDASBgNVBAsMC0VuZ2luZWVyaW5nMTIwMAYDVQQDDClQaGFudG9t
   IEN5YmVyIENvcnBvcmF0aW9uIEludGVybWVkaWF0ZSBDQTCCAiIwDQYJKoZIhvcN
   AQEBBQADggIPADCCAgoCggIBAPJEEEDFnoPwu70writqR/s2njLR6FqVNYcXGnot
   U9SU0mlOse3ZKa1tNKE84WBO0IYxFTXO+B1F7DK2aGmvC2pAdMH34zOdfk3j2FwA
   Zed4NUzkmn2cFcTa7Ldroj+8DLWPnB03FAlPfcXOx1yYhV1vxTdT1uw+nzyxbUGf
   kMVu0i+NpXjar9hzkw7YxyShnUYrlBX/kA8arWoe9v+b/1t8mnySb+v0DdW5i2pS
   6Jnu2C6tnYzPbqyQANsar1MFWHV0c3L24f8B8je33vdqdzmKlGbvCBBMS0LCQm7L
   B1xDY3yJrkjc+x6R6cBytxwW9+h/eZp6wpu2vtX15EOF6acJOCHtvXM9CbpVRHkW
   Hy5+c5cuEh4HA/0BGZa0okhy8aguD+YCVVFkeZ+UM0Arxs+mVrlbNQjeogaP1Kxm
   k7+GooB0z1PXL95dZarovawuJ+k3IPT+trTO8CtINqOZqauo56n6KSWtpN0OP+nE
   6xb92DR9LP8GvdKEnVH7AxBLinNrwtUqXgmqJFjcqNE6RdxmBxr2s35WJzaqBkzp
   mX4HVyxIFDXSRIY54RjyNcx+5glcCrDilekm6sSTtNcV3vCxSMlj64UjtaI8j0ph
   3xNFLfJBa9sDyljmwo+1SFQw/VIfDoasPJtxkgW/ry47XLs4wPvljNm/8bG/wtbf
   QmMfAgMBAAGjZjBkMB0GA1UdDgQWBBTjq/YIkhAYNe7UUHoz2UpuyhQNEjAfBgNV
   HSMEGDAWgBQtWQnie48FM86cNmhnlUEI9o0OQjASBgNVHRMBAf8ECDAGAQH/AgEA
   MA4GA1UdDwEB/wQEAwIBhjANBgkqhkiG9w0BAQsFAAOCAgEATriE0O4xdpHojl5H
   l7xdTi5sBe5KdZ+zgs6BBJSbDKKPoADZzx0CUB5vzqx1By3z4aS0fWId+eG1rQ70
   JA2if+JqLR/NK0M9n/D9e4/wwz+GgDdtFARljrdvPiau4Rk1ybNGgdvKHBjF9lCG
   7uo1XVJ/IszFJGG37q3L+0aJjQnKxmgd0Fh1z50OtMjiO6EKzeAIJagr+zceobUt
   c5c3E67fITGI1Dr74em+g4Wo2th0zt7OYwfVTbFM7delGnCS/+J2JlGOX6A4KVd5
   2dN79y7Asf5ULngDOg77N+coHaEhHSS5gLYQ2vsi6mIRBmJaxkYwQErAg3ObHXiV
   94KIGlmDq3C9f1olUHdEbOw0njYG7R0zciKGe78FVQqtmjK1gbI8x9bo9+kzyVH6
   1Ru7ZnoitT8UqJxtMml4pUSHSM9u4HCjXkSYzEWmZzn+6weqH1qLwBCiqx5hgKUI
   IHq8Hu/RPwFQsEqTSZAgcA0QvbMxT7yqt5HYxLNvj6sbieQNRxjeUshCFt6/o42e
   buAkABxg0cY1kRdSKDjRL6NSw7t6GLs0xkW8Z98WbMmE7LueXqKTk/FZVRL4u9Nx
   eeheRnVf5vPVd6OSsLxpCQtzOCb9zG+LvIg16qJfacXtsDHbcRM6cKaDKlTT2CmA
   +xULbgPvxpR3cOc2l+bxhf0EExM=
   -----END CERTIFICATE-----
   

4. Restart the nginix service:

   phsvc restart nginx

   If Nginx fails to restart, SELinux may have a conflict with the changed security context of the SSL files. The issue can be resolved by resetting the security context of the replaced SSL files. The Nginx error log location is /var/log/nginx/error.log. Run the following commands to reset the security context and restart Nginx:

   restorecon /opt/phantom/etc/ssl/certs/httpd_cert.crt
   restorecon /opt/phantom/etc/ssl/private/httpd_cert.key
   phsvc restart nginx
   

Add a public key to your Splunk Enterprise instance

If you want to use the default Splunk Phantom certificate or create your own self-signed certificate so that Splunk Phantom can communicate securely with Splunk Enterprise, you must add your public key to Splunk Enterprise. To do so, perform the following tasks on Splunk Enterprise:

1. Make a backup copy of the existing $SPLUNK_HOME/etc/apps/phantom/local/cert_bundle.pem file.
2. Edit the existing $SPLUNK_HOME/etc/apps/phantom/local/cert_bundle.pem file and add your PEM formatted certificate to the end of the file. This is the .pem or .crt file from the default Splunk Phantom certificate or your own self-signed certificate. See Getting your certificates in the Securing Splunk Enterprise manual for more information about creating your own SSL certificates for Splunk Enterprise.

Manage HTTPS certificate validation using configuration files

You can configure HTTPS certificate validation by editing the verify_certs stanza in the phantom.conf Splunk Phantom App for Splunk configuration file.

Perform the following tasks:

• Set the value to true or 1 to enable HTTPS certificate validation. For example:

  [verify_certs]
  value = true
  

• Set the value to false or 0 to disable HTTPS certificate validation. For example:

  [verify_certs]
  value = false
  

It is a best practice to edit a local version of any configuration file, not the version in the default folder. See How to edit a configuration file in the Splunk Enterprise Admin Manual for more information.

Restart Splunk Enterprise to have configuration file changes take affect. To learn more, see When to restart Splunk Enterprise after a configuration file change in the Splunk Enterprise Admin Manual.

Manage HTTPS certificate validation using the REST API

In Splunk Enterprise, you can configure HTTPS certificate validation using the REST API by sending an HTTP POST to the REST endpoint with a curl command. The curl command has the following format:

curl -ku <username>:<password> https://<hostname>:<mgmtHostPort>/servicesNS/nobody/phantom/configs/conf-phantom/verify_certs -d value=<true|false>

See Configuration endpoint descriptions in the Splunk Enterprise REST API Reference Manual for more information.

This method is not allowed in Splunk Cloud environments.