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mingfang/convert id_rsa to pem

Last active October 2, 2024 14:21
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Convert id_rsa to pem file
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convert id_rsa to pem
openssl rsa -in ~/.ssh/id_rsa -outform pem > id_rsa.pem
chmod 600 id_rsa.pem
@linuxtim
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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
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andreif commented Feb 26, 2024

Huh, TIL! Thanks @linuxtim!

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