Category: Tool (Page 2 of 4)

MailScanner with Postfix

January 16, 2020 / ron / 0 Comments

Prerequisite

Installed MailScanner

Resolving MailScanner Dependencies

Run the following cpan commands one at a time (i.e. to see if they are successfully installed):

sudo cpan -i Filesys::Df

sudo cpan -i IO::Stringy

sudo cpan -i DBI

sudo cpan -i Net::CID

sudo cpan -i Sys::SigAction

sudo cpan -i MIME::Parser

sudo cpan -i Archive::Zip

sudo cpan -i OLE::Storage_Lite

sudo cpan -i DBD::SQLite

Install the following packages:

sudo apt-get install unrar
sudo apt-get install sqlite

Installing Clamav Antivirus

Run the following command:

sudo apt-get install clamav clamav-daemon

Integrating Clamav to MailScanner

Update the /etc/MailScanner/MailScanner.conf to have the fields Virus Scanner and Clamd Socket to become as follows:
```
Virus Scanner = clamd
Clamd Socket = /var/run/clamav/clamd.ctl
```
Restart the mailscanner service with the following command:
```
sudo service mailscanner restart
```

Update the file /etc/apparmor.d/usr.sbin.clamd to have the following entries:

  /var/spool/MailScanner/** rw,
  /var/spool/MailScanner/incoming/** rw,

Restart the apparmor service with the following command:
```
sudo systemctl restart apparmor.service
```

Installing and Updating Spamassassin

Run the following commands:

sudo apt-get install spamassassin
sudo sa-update
sudo service spamassassin start

Integrating MailScanner to Postfix

Open the file /etc/postfix/main.cf for editing and add the following line and save:
```
header_checks = regexp:/etc/postfix/header_checks
```
Create the file /etc/postfix/header_checks with the following:
```
/^Received:/ HOLD
```

Open the file /etc/MailScanner/MailScanner.conf for editing and update with the following if necessary:

Run As User = postfix
Run As Group = postfix
Incoming Queue Dir = /var/spool/postfix/hold
Outgoing Queue Dir = /var/spool/postfix/incoming
MTA = postfix

Open the file /etc/MailScanner/defaults for editing and update with the following if necessary:
```
run_mailscanner=1
```
Update the group of /var/spool/MailScanner to mtagroup and allow the it write permission as follows:
```
sudo chown :mtagroup /var/spool/MailScanner
sudo chmod 775 MailScanner
```

Prepare spamassassin's directory using the following commands:

sudo mkdir /var/spool/MailScanner/spamassassin
sudo chown postfix /var/spool/MailScanner/spamassassin

Update the permission of the MailScanner's incoming and quarantine folders with the following commands:

sudo chown postfix.mtagroup /var/spool/MailScanner/incoming
sudo chmod 770 /var/spool/MailScanner/incoming
sudo chown postfix.mtagroup /var/spool/MailScanner/quarantine

Restart the mailscanner service with the following command:
```
sudo service mailscanner restart
```

Writing an Image File to an SDCard using Win32DiskImager

January 15, 2020 / ron / 0 Comments

Insert your SDCard.
Startup your Win32DiskImager.
On the Image file field, specify the location of the image file.
On the Device field, select the drive letter of the inserted SDCard.
Click the Write button.
To continue, click the Yes button and wait until it's done.
Once completed, click the OK button.
Click the Exit button.

Creating an Image File of an SDCard using Win32DiskImager

January 15, 2020 / ron / 0 Comments

Insert your SDCard.
Startup your Win32DiskImager.
On the Image file field, specify the desired filename of the image.
On the Device field, select the drive letter of the inserted SDCard.
Click the Read button and wait until it's done.
Once completed, click the OK button.
Click the Exit button.

Installing a Debian Package in Ubuntu

January 14, 2020 / ron / 0 Comments

Run the following command:
```
sudo dpkg -i <DEBIAN_PACKAGE>
```
Token Description

DEBIAN_PACKAGE A Debian package that normally has deb extension.
Fix the broken dependencies by running the following command:
```
sudo apt-get install -f
```

Using Rsync to Sync a Local Directory to Another Local Directory

January 7, 2020 / ron / 0 Comments

Syntax

To sync some of your local directories to another local directory, you can use the following syntax:

rsync -av -L --delete <DIR1>[[ <DIR2>] <DIRn>] <DESTINATION_DIR>

Token	Description
DIR1, DIR2, DIRn	These are the local directories you've wanted to be synced. Only DIR1 is required and the rest are optional.
DESTINATION_DIR	The destination directory on the remote machine.

Example

rsync -av -L --delete /var/log/ /data/log/

Sign a File with Detached ASCII Signature

December 2, 2019 / ron / 0 Comments

Use the following command to create a detached ASCII signature:

gpg --armor --output <ASC_FILE> --detach-sig <FILE_TO_SIGN>

Verify the file with detached ASCII signature.

Using Detach ASCII Signature to Verify a File

December 2, 2019 / ron / 0 Comments

Import Keys from Keyserver

Run the following command:

gpg --receive-keys <KEY_ID>

Showing the Fingerprints

Run the following command:

gpg --fingerprint <KEY_ID>

Verifying a File with ASCII Key

Download the detach asc <ASC_FILE> file associated to the file.
Download the signed file <SIGNED_FILE> file.
Use the following command for verification:
```
gpg --verify <ASC_FILE> <SIGNED_FILE>
```

Generating PGP Keys with Gpg4win

December 2, 2019 / ron / 0 Comments

Pre-requisite

Gpg4win (i.e from https://www.gpg4win.org/).

Generating Keys

Run the following command:
```
gpg --full-gen-key
```

Type 1 and press enter for the following question:

Please select what kind of key you want:
   (1) RSA and RSA (default)
   (2) DSA and Elgamal
   (3) DSA (sign only)
   (4) RSA (sign only)
Your selection?

Press enter for the following question:

RSA keys may be between 1024 and 4096 bits long.
What keysize do you want? (2048)

Press enter for the following question:

Please specify how long the key should be valid.
         0 = key does not expire
      <n>  = key expires in n days
      <n>w = key expires in n weeks
      <n>m = key expires in n months
      <n>y = key expires in n years
Key is valid for? (0)

Type y and press enter for the following question:

Key does not expire at all
Is this correct? (y/N)

Fill in the Real name appropriately and press enter.
Fill in the Email address appropriately and press enter.
The Comment is optional but don't forget to press enter.

Type o and press enter for the following question:

Change (N)ame, (C)omment, (E)mail or (O)kay/(Q)uit?

Fill-in the passphrase appropriately.

The output will be ending with something like the following:

pub   rsa2048 2019-11-27 [SC]
      8C99E30527B112D1CB6D646FE86A4FE7189AADC9
uid                      Real Name <real_email@email.com>
sub   rsa2048 2019-11-27 [E]

The second line is the PGP key ID. Thus from the output above. The key id is:

8C99E30527B112D1CB6D646FE86A4FE7189AADC9

Exporting Your Private Key

The my-secret-key.pgp file generated by this command can be use for signing your binaries.

Run the following command:

gpg --export-secret-keys <KEY_ID> > my-secret-key.pgp

DO NOT SHARE THIS FILE OR COMMIT TO YOUR REPOSITORY.

Publishing Your Public Key

Run the following command:

gpg --keyserver hkp://keys.openpgp.org --send-keys <KEY_ID>

Validating your Published Public Key

You can validate the upload public key by placing your <KEY_ID> as a Search String from the following address: https://keys.openpgp.org.

This will only work if you submit your keys using the preceding section.
Click the Search button.

Extracting GMail SMTP Certificate using OpenSSL

November 14, 2019 / ron / 0 Comments

1a.) For TLS, use the following command:

openssl s_client -connect smtp.gmail.com:587 -starttls smtp

1b.) For SSL, use the following command:

openssl s_client -connect smtp.gmail.com:465

2.) Both outputs of the preceding commands are long but you we are just interested in the entries that starts with:

-----BEGIN CERTIFICATE-----

and ends with:

-----END CERTIFICATE-----

3.) Copy that block of entries to a new file like smtp.gmail.com.pem.

This file is now the certificate file.

Using Google SMTP with Archiva in Synology

November 14, 2019 / ron / 0 Comments

Pre-requisite

Configured Archiva in Synology

Procedure

Open the archiva.xml file found in the following location:
```
/volume1/@appstore/Tomcat7/src/conf/Catalina/localhost
```

Update the Resource entry with the name mail/Session to become the following:

<Resource name="mail/Session" auth="Container"
      type="javax.mail.Session"
      mail.smtp.host="smtp.gmail.com"
          mail.smtp.port="587"
          mail.smtp.auth="true"
          mail.smtp.user="<USERNAME>"
          password="<PASSWORD>"
          mail.smtp.starttls.enable="true"
          mail.transport.protocol="smtp"/>

Token	Description
USERNAME	Google Account
PASSWORD	Google App Password

Save the updated file and wait for Archiva to restart.

If you've updated the archiva.xml file and save it, Tomcat will detect it and it will restart the Archiva application.

Category: Tool (Page 2 of 4)

MailScanner with Postfix

Prerequisite

Resolving MailScanner Dependencies

Installing Clamav Antivirus

Integrating Clamav to MailScanner

Installing and Updating Spamassassin

Integrating MailScanner to Postfix

Writing an Image File to an SDCard using Win32DiskImager

Creating an Image File of an SDCard using Win32DiskImager

Installing a Debian Package in Ubuntu

Using Rsync to Sync a Local Directory to Another Local Directory

Sign a File with Detached ASCII Signature

Using Detach ASCII Signature to Verify a File

Import Keys from Keyserver

Showing the Fingerprints

Verifying a File with ASCII Key

Generating PGP Keys with Gpg4win

Pre-requisite

Generating Keys

Exporting Your Private Key

Publishing Your Public Key

Validating your Published Public Key

Extracting GMail SMTP Certificate using OpenSSL

Using Google SMTP with Archiva in Synology

Pre-requisite

Procedure

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Token	Description
DEBIAN_PACKAGE	A Debian package that normally has deb extension.