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ajitabh pandey.info my work, life, views and scriblings skip to content home my books profile about me ← older posts using wrap utility to hide the sql code in oracle posted on july 15, 2019 by ajitabh at times we may need to encrypt sensitive information in certain columns in oracle database. oracle provides a dbms_crypto package for the purpose. more details about this package can be found in oracle documentation here . the approach i followed is as follows – create a custom package using features provided in dbms_crypto, which will consists for functions to encrypt / decrypt varchar and blob type columns. use this package to encrypt / decrypt the data in the fields. for a reference implementation of such a code, you can refer to the oracle documentation mentioned above. one key aspect is the use of a ‘key’ in the encryption logic. in the sample code given on the documentation, a random key has been chosen. this random key is fine as long as you do not recompile the package. if the package is recompiled then the key changes and hence invalidates all the encrypted data which can not be decrypted in the absence of the old key. if we keep the key as fixed, then anyone looking at the source code of the package can see the key and thus potentially compromising on the security aspects. to resolve this, fortunately oracle provides a wrap utility to hide the source code. $ wrap iname=enc_dec.sql oname=enc_dec.sql.wrp sql> @enc_dec.sql.wrp; now anyone looking at the source code of the package will find gibberish understood by oracle only. however, the original source with the key has to be kept safe, just incase you need it back again. share this: facebook twitter pocket linkedin tumblr pinterest more email print reddit like this: like loading... posted in uncategorized | leave a comment apt pinning in raspbian posted on june 17, 2018 by ajitabh quite sometime back i wrote a blog entry on apt-pinning to mix multiple repositories in debian and prioritize them. recently, i felt the need to do the same on my raspberry pi. i use rsnapshot to backup remote systems. rsnapshot has an associated perl script which is meant to send beautiful reports via email at the end of the backup. the script in the version which came with raspbian was broken (1.3.1-4+deb8u1) and i needed 1.4.2-1, which is available in debian stretch . following my earlier post, i performed the following steps to perform the installation of the required version without impacting the rest of the system. as you can see that the priority of jessie is higher than that of stretch , which will ensure that the system does not get messed up when you do an upgrade. # create the preferences file for jessie and stretch as shown below $ sudo vi /etc/apt/preferences.d/jessie.pref package: * pin: release n=jessie pin-priority: 900 $ sudo vi /etc/apt/preferences.d/stretch.pref package: * pin: release a=stretch pin-priority: 750 # define the package sources for both jessie and stretch $ sudo vi /etc/apt/sources.list.d/jessie.list deb http://mirrordirector.raspbian.org/raspbian/ jessie main contrib non-free rpi $ sudo vi /etc/apt/sources.list.d/stretch.list deb http://mirrordirector.raspbian.org/raspbian/ stretch main contrib non-free rpi # refresh the cache and sources list $ sudo apt-get update # install the desired package by specifying the repository from which # it has to be installed $ sudo apt-get install rsnapshot -t stretch please be careful before performing these steps in a production system. share this: facebook twitter pocket linkedin tumblr pinterest more email print reddit like this: like loading... posted in floss , raspberrypi | tagged apt , debian , raspberrypi | leave a comment ansible quirks – 4 posted on june 16, 2018 by ajitabh i was installing ansible on opensuse leap 42.3 machine and faced a problem with multiple python versions. i have both python 2.7 and python 3.4 installed on this machine. python 2.7 is the default one. i tried installed ansible with the usual pip install and was faced with an error related to setuptools (could not capture the error message). i upgraded my pip version to the latest one 10.0.1 and then installed ansible. $ sudo pip install --upgrade pip $ sudo pip install ansible after that i ran an ansible-galaxy init command to create one of the roles and i was welcome with the error stating “error: ansible requires a minimum of python2 version 2.6 or python3 version 3.5. current version: 3.4.6”. and i was wondering what happened because my default python version was 2.7. the usual google search did not help me go anywhere. so i looked at the /usr/bin/ansible file and found that it was using python3 interpreter. $ head -1 /usr/bin/ansible #!/usr/bin/python3 i then checked the source of pip command and found the same thing. $ head -1 /usr/bin/pip #!/usr/bin/python3 so i looked at pip documentation on installing pip for python 2.7 and found this link which helped me with the command to install pip for the default version of python installed – $ sudo python -m ensurepip --default-pip requirement already satisfied: setuptools in /usr/lib/python2.7/site-packages collecting pip installing collected packages: pip successfully installed pip-9.0.1 now when i reinstalled ansible, it installed the correct python interpreter for my system. $ sudo pip install ansible collecting ansible cache entry deserialization failed, entry ignored ..... ..... you are using pip version 9.0.1, however version 10.0.1 is available. you should consider upgrading via the 'pip install --upgrade pip' command. $ head -1 /usr/bin/pip /usr/bin/ansible ==> /usr/bin/pip <== #!/usr/bin/python ==> /usr/bin/ansible <== #!/usr/bin/python now when i upgraded pip it was for the default python version $ sudo pip install --upgrade pip collecting pip using cached https://files.pythonhosted.org/packages/0f/74/ecd13431bcc456ed390b44c8a6e917c1820365cbebcb6a8974d1cd045ab4/pip-10.0.1-py2.py3-none-any.whl installing collected packages: pip found existing installation: pip 9.0.1 uninstalling pip-9.0.1: successfully uninstalled pip-9.0.1 successfully installed pip-10.0.1 $ head -1 /usr/bin/pip /usr/bin/ansible ==> /usr/bin/pip <== #!/usr/bin/python ==> /usr/bin/ansible <== #!/usr/bin/python</p> in all probability all this was my fault and i think the pip which i upgraded in the beginning of this process may have been installed for python3 by me, otherwise i do not see any reason for all these issues. still i thought to share this entry, just in case someone can be helped. share this: facebook twitter pocket linkedin tumblr pinterest more email print reddit like this: like loading... posted in tips/code snippets , uncategorized | tagged ansible , ansible-quirks | 1 comment running oracle 11g release 2 (11.2.0.2) xe in docker container posted on february 9, 2018 by ajitabh in dockercon2017 oracle announced the availability of oracle containers in the docker hub. this was a great step forward. i have been thinking of trying oracle in docker from quite a while for some personal projects, but was not finding time to experiment. the availability of docker build files on github made this task easier. you would still need to download the oracle database files from otn and place them in the prespecified directory. i tried 11g r2 xe and it was successful. the instructions provided are quite decent so i am not going to explain everything here again. i am running docker 17.04.0-ce on opensuse leap 42.2. while building both 12c and 11gr2 containers i was getting “healthcheck unknown flag error”. this is because healthcheck option was made available in docker 17.06 onwards. as suggested in this issue , i simply removed the following line from the dockerfile.xe and then the image built flawlessly. healthcheck --interval=1m --start-period=5m \ cmd [ "su", "-p", "oracle", "-c", "$oracle_base/$check_db_file > /dev/null || exit 1" ] following is the quick sequence of steps i followed to build the image an

URL analysis for ajitabhpandey.info

https://ajitabhpandey.info/tag/book-reviews-2/
https://ajitabhpandey.info/tag/freebsd/
https://ajitabhpandey.info/2018/06/ansible-quirks-4/?share=facebook
https://ajitabhpandey.info/2018/02/running-oracle-11g-release-2-11-2-0-2-xe-in-docker-container/
https://ajitabhpandey.info/tag/heartbeat/
https://ajitabhpandey.info/tag/networking/
https://ajitabhpandey.info/tag/security/
https://ajitabhpandey.info/2018/06/ansible-quirks-4/?share=linkedin
https://ajitabhpandey.info/2017/05/connecting-to-oracle-database-over-ssh-using-sqldeveloper-4-1/
https://ajitabhpandey.info/2018/06/ansible-quirks-4/?share=twitter
https://ajitabhpandey.info/category/solarisaixhpux/
https://ajitabhpandey.info/2018/02/running-oracle-11g-release-2-11-2-0-2-xe-in-docker-container/?share=facebook
https://ajitabhpandey.info/2018/06/ansible-quirks-4/?share=pinterest
https://ajitabhpandey.info/tag/mathematics/
https://ajitabhpandey.info/2019/07/using-wrap-utility-to-hide-the-sql-code-in-oracle/?share=linkedin

Whois Information

Whois is a protocol that is access to registering information. You can reach when the website was registered, when it will be expire, what is contact details of the site with the following informations. In a nutshell, it includes these informations;

Domain Name: AJITABHPANDEY.INFO
Registry Domain ID: D10371404-LRMS
Registrar WHOIS Server: whois.easydns.com
Registrar URL: http://www.easydns.com
Updated Date: 2018-05-23T12:17:53Z
Creation Date: 2005-06-07T16:33:03Z
Registry Expiry Date: 2019-06-07T16:33:03Z
Registrar Registration Expiration Date:
Registrar: easyDNS Technologies Inc.
Registrar IANA ID: 469
Registrar Abuse Contact Email:
Registrar Abuse Contact Phone:
Reseller:
Domain Status: clientTransferProhibited https://icann.org/epp#clientTransferProhibited
Domain Status: clientUpdateProhibited https://icann.org/epp#clientUpdateProhibited
Registrant Organization: Ajitabh Pandey
Registrant State/Province: Uttarakhand
Registrant Country: IN
Name Server: NIRVANA.EASYDNS.NET
Name Server: RUSH.EASYDNS.COM
Name Server: MOTORHEAD.EASYDNS.ORG
DNSSEC: unsigned
URL of the ICANN Whois Inaccuracy Complaint Form: https://www.icann.org/wicf/
>>> Last update of WHOIS database: 2018-06-07T20:07:22Z <<<

For more information on Whois status codes, please visit https://icann.org/epp

Access to AFILIAS WHOIS information is provided to assist persons in determining the contents of a domain name registration record in the Afilias registry database. The data in this record is provided by Afilias Limited for informational purposes only, and Afilias does not guarantee its accuracy. This service is intended only for query-based access. You agree that you will use this data only for lawful purposes and that, under no circumstances will you use this data to(a) allow, enable, or otherwise support the transmission by e-mail, telephone, or facsimile of mass unsolicited, commercial advertising or solicitations to entities other than the data recipient's own existing customers; or (b) enable high volume, automated, electronic processes that send queries or data to the systems of Registry Operator, a Registrar, or Afilias except as reasonably necessary to register domain names or modify existing registrations. All rights reserved. Afilias reserves the right to modify these terms at any time. By submitting this query, you agree to abide by this policy.

Please query the RDDS service of the Registrar of Record identified in this output for information on how to contact the Registrant, Admin, or Tech contact of the queried domain name.

  REFERRER http://whois.afilias.info

  REGISTRAR Afilias Global Registry Services

SERVERS

  SERVER info.whois-servers.net

  ARGS ajitabhpandey.info

  PORT 43

  TYPE domain

DOMAIN

  NAME ajitabhpandey.info

  HANDLE D10371404-LRMS

  CREATED 2005-07-06

STATUS
clientTransferProhibited https://icann.org/epp#clientTransferProhibited
clientUpdateProhibited https://icann.org/epp#clientUpdateProhibited

NSERVER

  NIRVANA.EASYDNS.NET 45.79.142.6

  RUSH.EASYDNS.COM 46.101.120.153

  MOTORHEAD.EASYDNS.ORG 173.255.247.224

OWNER

  ORGANIZATION Ajitabh Pandey

ADDRESS

  STATE Uttarakhand

  COUNTRY IN

  REGISTERED yes

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