21 Feb
2015
21 Feb
'15
7:32 p.m.
On 02/21/2015 06:07 PM, Chris Murphy wrote:
I'm curious about how the hash in /etc/passwd is generated.
I know it's SHA512 based, since the 2nd field starts with $6$. But the characters that follow aren't a SHA512 hash. It looks like it was run through base64.
I read this: http://www.aychedee.com/2012/03/14/etc_shadow-password-hash-formats/ But Fedora doesn't have mkpasswd by default, whereas passwd seems to only update shadow rather than outputting to stdout. And if there's a salt used I can't tell how that would be referenced.
Thanks,
Why not just download http://mirrors.kernel.org/fedora/releases/21/Everything/source/SRPMS/p/asswd...
and read the source code :) There are macros you will need to look at as well