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Linux Netbox Networking Uncategorized YouTube CCESTE

SSL automático con Let’s Encrypt en Docker

No podemos dejar el servicio expuesto en HTTP, hay info sensible que se intercambia, como credenciales y datos de infraestructura de red
Vamos a usar un contenedor de ayuda que nos va a gestionar la terminación SSL de nuestro Netbox

Yo uso Digital Ocean, si vos querés usarlo también dale con este link de referido que te sirve a vos y a mi
A vos te van a dar $200 en crédito pasa usar así podés probarlo
https://m.do.co/c/47b87a73eb62

El repo del proyecto lo encontrás en
https://github.com/nginx-proxy/acme-companion

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Linux Sad Servers Uncategorized YouTube CCESTE

Sad Servres 20 – Paris : Where is my webserver?

Level: Medium
Type: Hack
Description: A developer put an important password on his webserver localhost:5000 . However, he can’t find a way to recover it. This scenario is easy to to once you realize the one “trick”.

Personalmente me pareció medio choto este escenario, salgo que me haya pasado de largo la manera de verificar el user agent…

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Linux Sad Servers Uncategorized YouTube CCESTE

Sad Servers 16 – Lisbon : etcd SSL cert troubles

Level: Medium
Type: Fix
Description: There’s an etcd server running on https://localhost:2379 , get the value for the key “foo”, ie etcdctl get foo or curl https://localhost:2379/v2/keys/foo

Segundo intento con lo ya aprendido, ahora si salió todo bien!

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Linux Sad Servers Uncategorized YouTube CCESTE

Sad Servers 09 – Manhattan : can’t write data into database.

Level: Medium

Type: Fix

Access: Public

Description: Your objective is to be able to insert a row in an existing Postgres database. The issue is not specific to Postgres and you don’t need to know details about it (although it may help).

Helpful Postgres information: it’s a service that listens to a port (:5432) and writes to disk in a data directory, the location of which is defined in the data_directory parameter of the configuration file /etc/postgresql/14/main/postgresql.conf. In our case Postgres is managed by systemd as a unit with name postgresql.

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Linux Sad Servers Uncategorized YouTube CCESTE

Sad Servers 07 – Lhasa : Easy Math

Type: Do

Access: Email

Description: There’s a file /home/admin/scores.txt with two columns (imagine the first number is a counter and the second one is a test score for example).

Find the average (more precisely; the arithmetic mean: sum of numbers divided by how many numbers are there) of the numbers in the second column (find the average score).

Use exaclty two digits to the right of the decimal point. i. e., use exaclty two “decimal digits” without any rounding. Eg: if average = 21.349 , the solution is 21.34. If average = 33.1 , the solution is 33.10.

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Linux Sad Servers Uncategorized YouTube CCESTE

Sad Servers 05 – Taipei : Come a-knocking

Level: Easy

Type: Hack

Description: There is a web server on port :80 protected with Port Knocking. Find the one “knock” needed (sending a SYN to a single port, not a sequence) so you can curl localhost.

Test: Executing curl localhost returns a message with md5sum fe474f8e1c29e9f412ed3b726369ab65. (Note: the resulting md5sum includes the new line terminator: echo $(curl localhost))

La versión del Pelado Nerd la encontrás acá https://www.youtube.com/watch?v=45E_RChOfz0

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Linux Sad Servers Uncategorized YouTube CCESTE

Sad Servers 04 – The Command Line Murders – Resuelto en el 2do intento

Level: Easy

Description: This is the Command Line Murders with a small twist as in the solution is different

Enter the name of the murderer in the file /home/admin/mysolution

Anteriormente intenté resolverlo sin éxito, te lo dejo acá para que lo veas
https://youtu.be/IM8A8nifWjg

Este es el segundo intento, ya con alguna idea de como encarar el desafío

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Linux Sad Servers Uncategorized YouTube CCESTE

Sad Servers 04 -😵 The Command Line Murders😵 Failed 😵

Level: Easy

Description: This is the Command Line Murders with a small twist as in the solution is different

Enter the name of the murderer in the file /home/admin/mysolution

Honestamente no sabía ni por donde arrancar, pero creo que nos quedaron algunos buenos indicios para un segundo intento

Recuerden que nadie nació sabiendo, lo importante es aprender en el camino 😊

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Linux Sad Servers Uncategorized YouTube CCESTE

Sad Servers 03 – Santiago : Find the secret combination

Level: Easy

Type: Do

Description: Alice the spy has hidden a secret number combination, find it using these instructions:

1) Find the number of lines with occurrences of the string Alice (case sensitive) in the *.txt files in the /home/admin directory
2) There’s a file where Alice appears exactly once. In that file, in the line after that “Alice” occurrence there’s a number.
Write both numbers consecutively as one (no new line or spaces) to the solution file.
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Linux Sad Servers Uncategorized YouTube CCESTE

Sad Servers 02 – Saskatoon : counting IPs

Level: Easy

Type: Do

Description: There’s a web server access log file at /home/admin/access.log. The file consists of one line per HTTP request, with the requester’s IP address at the beginning of each line.

Find what’s the IP address that has the most requests in this file (there’s no tie; the IP is unique). Write the solution into a file /home/admin/highestip.txt.

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