Skip to content

Instantly share code, notes, and snippets.

@mingfang

mingfang/convert id_rsa to pem

Last active March 3, 2024 08:46
Show Gist options
  • Save mingfang/4aba327add0807fa5e7f to your computer and use it in GitHub Desktop.
Save mingfang/4aba327add0807fa5e7f to your computer and use it in GitHub Desktop.
Download ZIP
Convert id_rsa to pem file
Raw
convert id_rsa to pem
openssl rsa -in ~/.ssh/id_rsa -outform pem > id_rsa.pem
chmod 600 id_rsa.pem
@linuxtim
Copy link

Some of the examples above contain insecure use of chmod.
In general to create a file securely, always set the umask first! e.g.

$ rm -f examplefile ; ( umask 0077 && echo "" > examplefile ) ; ls -l examplefile
-rw------- 1 tim tim 1 Feb 26 13:55 examplefile
$  rm -f examplefile ; ( umask 0377 && echo "" > examplefile ) ; ls -l examplefile
-r-------- 1 tim tim 1 Feb 26 13:55 examplefile

...if you don't do that, then your file creation is subject to a race condition, and can be maliciously read between you creating it, and chmodding it...

@andreif
Copy link

andreif commented Feb 26, 2024

Huh, TIL! Thanks @linuxtim!

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment