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On Ubuntu, it looks like the best place for a private key used to sign a certificate (for use by nginx) is in /etc/ssl/private/

This answer adds that the certificate should go in /etc/ssl/certs/ but that seems like an unsafe place. Do .crt files need to be kept safe or are they considered public?

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3 Answers 3

up vote 5 down vote accepted

The .crt file is sent to everything that connects; it is public.

To add to the private key location; make sure you secure it properly as well as having it in there. (chown root:ssl-cert and chmod 640)

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I wonder why that directory isn't g+s by default. –  Collin Anderson Sep 30 at 17:43

There's not really an unsafe place if permission for the individual files/directory is set to something like chown root :0 private.key and chmod 600 private.key so that only root can read it. CSRs and certificate files are less sensitive as you say.

With those permissions the paths you mention and /usr/local/ssl should be fine.

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Often, applications accessing private keys are running as non-root users. I'd suggest maintaining access for the ssl-cert group. –  Shane Madden Apr 13 '11 at 16:12
    
Understood but web servers like Apache spawn a root 'parent' process and assuming nginx too this is pertinent. –  Jonathan Ross Apr 13 '11 at 16:19

Under Ubuntu systems I personally keep mine in /etc/apache2/ssl/private or similar httpd etc created area.

All of this owned by root:

sudo mkdir /etc/apache2/ssl
sudo mkdir /etc/apache2/ssl/private
sudo chmod 755 /etc/apache2/ssl
sudo chmod 710 /etc/apache2/ssl/private

Copy/Move public www ssl certificate(s) to /etc/apache2/ssl

Move private key(s) to /etc/apache2/ssl/private - then:

sudo chmod 755 /etc/apache2/ssl/*.crt
sudo chmod 640 /etc/apache2/ssl/private/*.key

then verify root:ssl-cert owns it all:

sudo chown -R root:ssl-cert /etc/apache2/ssl

(^ owner:group can also be "root:root" - apache/nginx reads as root anyway - you can also do away with any group privilege in this case (private folder = chmod 700 / key file = chmod 600) if you do)

Done.

As mentioned, it really doesn't matter where you put your private key(s) as long as you properly protect them.

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