OPS345 Lab 5

THIS PAGE IS A DRAFT, NOT A REAL COURSE PAGE

The current schedule for OPS345 is here: OPS335_Weekly_Schedule

• set up a new vm named 'ns1' in vpc-ops345, 10.3.45.12, ops345sgprivate
• iptables -t nat -A PREROUTING -p tcp --dport 2212 -j DNAT --to 10.3.45.12:22
• allow access to port 2212 in ops3455sg
• install bind

• what is DNS
• how dns works
• typical registrar process
  • propagation time
• running a private DNS server
• requirements to run a public DNS server
• you should have received an email about a Bindistrar account that's been created for you
• set up an A record for yourmysenecaid.ops345.ca to point to your elastic IP (the one assigned to router)
• set up a CNAME record for www
• test the two records above using dig, and using firefox
• fix nextcloud "Access through untrusted domain"

• certificates, CAs, relationship with DNS
• CA-signed certs cost money. we have to use let's encrypt which is lame because it expires quickly unless you run their software on your server. but it's free
• https://help.datica.com/hc/en-us/articles/360044373551-Creating-and-Deploying-a-LetsEncrypt-Certificate-Manually
• install certbot in your workstation using apt or the software manager

$ sudo su
root@p51:/home/andrew# certbot certonly --manual --preferred-challenges dns
Saving debug log to /var/log/letsencrypt/letsencrypt.log
Plugins selected: Authenticator manual, Installer None
Enter email address (used for urgent renewal and security notices) (Enter 'c' to
cancel): asmith15@myseneca.ca

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Please read the Terms of Service at
https://letsencrypt.org/documents/LE-SA-v1.2-November-15-2017.pdf. You must
agree in order to register with the ACME server at
https://acme-v02.api.letsencrypt.org/directory
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(A)gree/(C)ancel: a

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Would you be willing to share your email address with the Electronic Frontier
Foundation, a founding partner of the Let's Encrypt project and the non-profit
organization that develops Certbot? We'd like to send you email about our work
encrypting the web, EFF news, campaigns, and ways to support digital freedom.
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(Y)es/(N)o: n
Please enter in your domain name(s) (comma and/or space separated)  (Enter 'c'
to cancel): asmith15.ops345.ca
Obtaining a new certificate
Performing the following challenges:
dns-01 challenge for asmith15.ops345.ca

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NOTE: The IP of this machine will be publicly logged as having requested this
certificate. If you're running certbot in manual mode on a machine that is not
your server, please ensure you're okay with that.

Are you OK with your IP being logged?
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(Y)es/(N)o: y

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Please deploy a DNS TXT record under the name
_acme-challenge.asmith15.ops345.ca with the following value:

SUobA6iJARuujmCDhb-4I0m61Zdtqe_uBgyX1ExrCPg

Before continuing, verify the record is deployed.
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Press Enter to Continue
Waiting for verification...
Cleaning up challenges

IMPORTANT NOTES:
 - Congratulations! Your certificate and chain have been saved at:
   /etc/letsencrypt/live/asmith15.ops345.ca/fullchain.pem
   Your key file has been saved at:
   /etc/letsencrypt/live/asmith15.ops345.ca/privkey.pem
   Your cert will expire on 2022-02-16. To obtain a new or tweaked
   version of this certificate in the future, simply run certbot
   again. To non-interactively renew *all* of your certificates, run
   "certbot renew"
 - Your account credentials have been saved in your Certbot
   configuration directory at /etc/letsencrypt. You should make a
   secure backup of this folder now. This configuration directory will
   also contain certificates and private keys obtained by Certbot so
   making regular backups of this folder is ideal.
 - If you like Certbot, please consider supporting our work by:

   Donating to ISRG / Let's Encrypt:   https://letsencrypt.org/donate
   Donating to EFF:                    https://eff.org/donate-le

You have new mail in /var/mail/root

• The file in /etc/letsencrypt/live/asmith15.ops345.ca/privkey.pem is what a CA would send you after you paid them. This one is free but it expires in 90 days, which is good enough for this course.