SSL/TLS support and authentication for SMTP

[fazledyn-or]

Details

While triaging your project, our bug fixing tool generated the following message(s)-

In file: utils.py, method: send_email, a clear-text protocol such as FTP, Telnet or SMTP is used. These protocols transfer data without any encryption, which expose applications to a large range of risks. iCR suggested that data should be transferred over only secure transport channels.

Changes

• Added SSL & TLS based SMTP support in send_mail() method in timesketch/lib/utils.py
• Added configuration related to the changes in data/timesketch.conf

CLA Requirements

This section is only relevant if your project requires contributors to sign a Contributor License Agreement (CLA) for external contributions.

All contributed commits are already automatically signed off.

The meaning of a signoff depends on the project, but it typically certifies that committer has the rights to submit this work under the same license and agrees to a Developer Certificate of Origin (see https://developercertificate.org/ for more information).
- Git Commit SignOff documentation

Checks

• All tests succeed.
• Unit tests added.
• e2e tests added.
• Documentation updated.

Closing issues

Closes #2939

Sponsorship and Support

This work is done by the security researchers from OpenRefactory and is supported by the Open Source Security Foundation (OpenSSF): Project Alpha-Omega. Alpha-Omega is a project partnering with open source software project maintainers to systematically find new, as-yet-undiscovered vulnerabilities in open source code - and get them fixed – to improve global software supply chain security.

The bug is found by running the Intelligent Code Repair (iCR) tool by OpenRefactory and then manually triaging the results.