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LinuxCBT - qMail Message Transfer Agent Training

Član
Učlanjen(a)
31.12.2011
Poruka
4.987
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LinuxCBT qMail Message Transfer Agent
Size 1.03 GB


Category Linux

Duration: 12 Hours

Course Objective
LinuxCBT qmail Edition – Module III

qmail – Installation
Identify current Mail Transfer Agent (MTA) environment on Red Hat Enterprise box
Discuss system initialization environment
Disable current MTA in applicable run-levels
Identify qmail pre-requisites
Setup qmail source-tree hierarchy for build process
Discuss qmail’s modular, component architecture – relevant binaries
Navigate to a close qmail mirror
Download qmail components
Extract primary qmail packaged and dicuss contents
Patch original qmail sources
Install ucspi-tcp – INETD/XINETD substitute
Install dameontools – daemon management for qmail daemons
Create requisite users and groups
Compile and install qmail
Define default qmail environment
Explore and discuss the important qmail directories, symlinks and binaries
Illustrate internal qmail communications required for local and remote deliveries
Identify initial qmail startup process
Define genersal startup scripts for qmail
Define supervise scripts for qmail delivery
Define supervise scripts for qmail logging
Backup default local queue-injection process (Sendmail)
Create Sendmail symlink to qmail-compatible binary for local queue-injection
Start qmail & confirm processes and network bindings

qmail – Local Mail
Define required system aliases using qmail files
Configure qmail rules to permit local relaying
Identify default mbox mail storage format
Use MUA mutt to deliver mail via qmail
Examine delivery via qmail logs
Identify mbox destination
Discuss local queue-injection logic – qmail-inject/Sendmail
Explain permissions used by qmail when delivering local mail
Update local user’s environment variables and confirm message delivery
Identify variables used for local queue-injection
Explore and discuss the mbox mail storage format
Update global environment configuration to reflect new mbox storage location
Examine running qmail statistics
Inject messages into the queue of a downed MTA
Examine results
Explore a message’s path throught the local queue
Resume message delivery

qmail – Mail Storage Formats
Switch qmail global configuration from mbox to Maildir storage format
Use maildirmake to create Maildir-compliant directory structure for users
Explore standard Maildir directory tree
Restart qmail and attempt delivery to Maildir mailbox
Confirm deliver of message to Maildir recipient
Discuss Maildir file nomenclature
Update environment variables to reflect Maildir mail storage format
Explore headers of delivered messages and discuss key components

qmail – Aliases
Explain the benefits of aliases
Explore traditional Sendmail-style aliases in /etc/aliases
Compare and contrast Sendmail-style aliases to qmail-style (.qmail) aliases
Discuss key qmail alias user
Explore system-wide qmail aliases
Test delivery to system-wide qmail aliases
Define an abuse qmail-style alias and confirm delivery
Deine one-to-many qmail-style abuse alias and confirm delivery
Attempt delivery to non-existing local user or alias using Sendmail and confirm results
Define a catch-all system-wide alias to handle non-existing local users or accounts
Test catch-all system-wide alias by injecting messages bound to non-existing mailboxes
Discuss sub-addresses/address extensions using qmail aliases
Define sub-address for non-privileged user and confirm delivery using MUA mutt
Forward defined non-privileged sub-address to other local user and examine results
Redirect the abuse alias to a Mailbox-style repository for evidence-collection
Confirm appended alias-redirection of messages destined to catch-all accounts

qmail – Remote Mail
Identify key qmail daemons and binaries responsible for remote delivery
Explain remote delivery logic using DNS
Connect (SSH) to remote Linux system to be used for initial remote delivery & explore
Attempt remote delivery using qmail and FQDN of remote box and examine the qmail queue
Alter remote Postfix environment to find Maildir mailbox and confirm delivery using mutt
Update remote Postfix configuration to handle messages destined to second-level domain
Alter remote Postfix transport (smtproutes) file to disable static delivery
Confirm DNS second-level Mail Exchanger (MX) configuration for linuxcbt.internal domain
Attempt MX-based delivery and confirm delivery on remote host
Discuss employed qmail logic
Switch primary Mail Exchanger (MX) from Postfix box to qmail box – adjusting distances
Confirm MX distances using Domain Information Groper (dig)
Attempt delivery to second-level domain from the qmail box & confirm delivery
Explore qmail log files for message-delivery information
Debug qmail-smtpd delivery issues and adjust to ensure delivery
Discuss a Backup MX configuration for a given domain
Update DNS configuration to reflect the ideal MX distances
Confirm DNS configuration from a tertiary Linux server
Purposely fail the primary Postfix server for the linuxcbt.external domain
Configure qmail to be a Backup MX server for a business partner’s domain
Attempt delivery to the linuxcbt.external domain from the tertiary Linux server
Examine queued messages for the linuxcbt.external backup domain on the qmail box
Re-enable the primary domain’s Postfix box
Flush the qmail queue and examine delivery to the primary MX host

qmail – Relay Control
Discuss Smart Host applications
Explore pre-Smart Host SMTP delivery of messages to Internet-based host
Configure qmail to use a remote Postfix SMTP Smart Host system
Disable Smart Host configuration
Discuss qmail’s default relay policy
Identify key qmail configuration files related to relaying
Attempt to relay from a remote Windows 2003 Host through the open qmail MTA
Confirm delivery of message via qmail in open-relay mode to local and remote recipients
Secure open relay and confirm inability to relay messages to untrusted domains
Configure selective relaying based on individual host and subnet
Discuss the benefits of SMTP Auth
Explain qmail’s SMTP Auth implementation
Identify SMTP Auth pre-requisites
Download, compile and install CheckPassword authentication application
Debug compilation-related errors
Download SMTP Auth patch
Patch qmail sources and recompile to produce modified qmail-smtpd binary
Install new qmail-smtpd binary and prepare run scripts for usage
Attempt to relay with tightened relay permissions and confirm failure
Confirm SMTP Auth from Windows 2003 Host using Outlook Express
Relay outbound messages using SMTP Auth from Outlook Express client

qmail – Network-based Mail Retrieval
Discuss Mail retrieval authentication framework using Courier
Identify pre-requisites
Download, compile and install Courier Authentication Daemon

Identify Courier Authentication key directories, binaries and configuration file
Download and install Courier IMAP Daemon
Explore Courier IMAP binary directory tree
Discuss Courier framework
Configure Courier for POP3 mail retrieval
Confirm retrieval using Windows 2003 – Outlook Express client
Identify POP3 Secure configuration files
Generate self-signed certificate for use with POP3 Secure communications
Confirm retrieval of messages using Outlook Expres and POP3 Secure
Establish run-level symbolic links for POP3 & POP3S services
Configure Courier for IMAP mail retrieval
Confirm retrieval using Windows 2003 – Outlook Express client
Generate self-signed certificate for use with IMAP Secure communications
Establish run-level symbolic links for IMAP & IMAPS services

qmail – Web-based Mail Retrieval
Discuss Web-based SquirrelMail pre-requisites
Enable Apache web server
Download and Install SquirrelMail into web-accessible location
Secure data and attachments directories
Configure SquirrelMail for initial use with Courier IMAP
Address PHP session-related issues
Explore SquirrelMail from the browser as various Linux users
Confirm deliver using multiple clients – (mutt/Outlook Express/SquirrelMail/Local Injection)

qmail – Virtual Domains
Discuss qmail virtual domains support via system-wide aliases
Configure basic/global virtual domains using.qmail files
Confirm delivery to users @ virtual domains
Configure individual virtual domains
Confirm delivery to individuals @ virtual domains
Ensure non-global delivery to virtual domains
Define non-privileged user-managed virtual domains
Confirm deliver to user-managed virtual domains

qmail – Malware Framework – OpenProtect, Bad Senders, TLS
Discus the OpenProtect Malware Framework
Identify pre-requisites
Download OpenProtect
Install Open Protect
Explore OpenProtect Configuration (MailScanner/ClamAV/SpamAssAssin)
Configure outbound signatures
Configure qmail to reject users based header information
Confirm rejection from Windows 2003 Host – Outlook Express
Discuss Transport Layer Security framework and requirements
Implement Transport Layer Security (TLS)
Configure Outlook Express client to use TLS & test outbound relaying

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