Category: Tool (Page 2 of 4)

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 --send-key <EMAIL_ADDRESS>

Use the email address you've used from generating the key.

Alternative way of Publishing your Public Key

Generate an ASCII-armored PGP key using the following command:
```
gpg --armor --export <EMAIL_ADDRESS>
```
Use the email address you've used from generating the key.

The preceding command is exporting your public key in ascii format.
Copy and paste the generated public ID to the following address: http://hkps.pool.sks-keyservers.net/#submit
Click the Submit this key to the keyserver! button.

Validating your Published Public Key

You can validate the upload public key by placing your <EMAIL_ADDRESS> as a Search String from the following address: http://hkps.pool.sks-keyservers.net/#extract.

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

Artifactory on Ubuntu with MariaDB

November 13, 2019 / ron / 0 Comments

Requirement

Java 8
MariaDB 10.3.x

Preparing MariaDB

Create the database called artdb using the following command:

CREATE DATABASE artdb CHARACTER SET utf8 COLLATE utf8_bin;

Add artifactory as the user to the newly created database using the following command:
```
GRANT ALL on artdb.* TO 'artifactory'@'<HOST>' IDENTIFIED BY '<PASSWORD>';
FLUSH PRIVILEGES;
```
Token Description

HOST The address of machine housing MariaDB

PASSWORD The password for the artifactory user.

Installing Artifactory

Add the artifactory repository to your source list.
```
echo "deb https://jfrog.bintray.com/artifactory-debs <DISTRIBUTION> main" | sudo tee -a /etc/apt/sources.list
```
Token Description
DISTRIBUTION
Use the following command to identify the destribution:

lsb_release -c

The sample output for ubuntu bionic distribution:

Codename: bionic

Download jfrog public key using the following command:

curl https://bintray.com/user/downloadSubjectPublicKey?username=jfrog | sudo apt-key add -

Update your package list using the following command:
```
sudo apt-get update
```
Install the oss artifactory using the following command:
```
sudo apt-get install jfrog-artifactory-oss
```

Artifactory Service Commands

Objective	Command
Checking service status	sudo service artifactory status
Starting the service	sudo service artifactory start
Stopping the service	sudo service artifactory stop
Restarting the service	sudo service artifactory restart

Accessing The Artifactory from the Browser

Use the following address to access the artifactory application:
```
http://localhost:8180/artifactory
```
Use the following default credentails:

Field Value

Username admin

Password password

It is recommended to change the admin password after installation but you can do it after hooking it to MariaDB.

Using the MariaDB Prepared Earliear

Variable	Value
$ARTIFACTORY_HOME	/var/opt/jfrog/artifactory

Using the terminal, change the directory to $ARTIFACTORY_HOME/tomcat/lib and execute the following:
```
sudo wget https://downloads.mariadb.com/Connectors/java/connector-java-2.4.4/mariadb-java-client-2.4.4.jar
```
You can visit https://mariadb.com/downloads/#connectors for a different version of java client.
Copy $ARTIFACTORY_HOME/misc/db/mariadb.properties to $ARTIFACTORY_HOME/etc/db.properties.

This will replace the default db.properties that is using derby as the database.

Update the following fields in the db.properties:

Field	Value
url	jdbc:mariadb://<HOST>:<PORT>/artdb?characterEncoding=UTF-8&elideSetAutoCommits=true&useSSL=false&useMysqlMetadata=true
password	The password you've used on Preparing MariaDB section.

Token	Value
HOST	The host you've indentified on Preparing MariaDB section.
PORT	This is the port where MariaDB is listening (i.e. 3306 or 3307).

Restart the artifactory service using the following command:
```
sudo service artifactory restart
```

Category: Tool (Page 2 of 4)

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

Alternative way of 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

Artifactory on Ubuntu with MariaDB

Requirement

Preparing MariaDB

Installing Artifactory

Artifactory Service Commands

Accessing The Artifactory from the Browser

Using the MariaDB Prepared Earliear

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