Re: Blowfish hashed passwords

I would love to know why your ubuntu 14.04 system doesn't support sha512-crypt.

I just tried SHA512-CRYPT and it is supported on Ubuntu 14.04. I think I was thinking about DBMail instead of Dovecot.

I could really use support for BLF-CRYPT since my current password hashes generated by PHP are using Blowfish encryption.

Maybe, Dovecot could just add support for BLF-CRYPT by using the open source implementation of Blowfish hashing found in https://github.com/php/php-src/tree/master/ext/standard https://github.com/php/php-src/tree/master/ext/standard. The implementation looks like a single function to generate the hash. I’m not much of a programmer, but it would seem to me that these .c/.h files could be added to Dovecot for doing BLF-CRYPT hashing.

This would mean all installations of Dovecot going forward would support BLF-CRYPT regardless of whether the crypt libraries have Blowfish built in.

Kevin

On Jun 4, 2016, at 9:53 AM, Patrick Domack patrickdk@patrickdk.com wrote:

Quoting KT Walrus mailto:kevin@my.walr.us>:

...

(I subscribed to a daily digest for this list and can’t figure out how to reply to a reply.)

Anyway, Aki Tuomi replied to my feature request saying:

...

We support in latest 2.2 release

MD5 MD5-CRYPT SHA SHA1 SHA256 SHA512 SMD5 SSHA SSHA256 SSHA512 PLAIN CLEAR CLEARTEXT PLAIN-TRUNC CRAM-MD5 SCRAM-SHA-1 HMAC-MD5 DIGEST-MD5 PLAIN-MD4 PLAIN-MD5 LDAP-MD5 LANMAN NTLM OTP SKEY RPA CRYPT SHA256-CRYPT SHA512-CRYPT

There is also blowfish support as BLF-CRYPT, but that requires that your system supports it. CRYPT supports whatever your crypt() supports.

The reason I suggest building in fallback hash type support is that my install of Dovecot on Ubuntu 14.04 didn’t support SHA512-CRYPT or BLF-CRYPT.

If Dovecot just included the PHP .c files to make sure it can process Blowfish/SHA512 password hashes on all installs, it would greatly simplify adding Dovecot as a service for my existing user accounts (without forcing them to give their password for the site so I can generate new hashes in a form that Dovecot supports). SHA256-CRYPT is probably my best option for password hashing since it supports ROUNDS to make hash generation slower. But, I would rather use BLF-CRYPT so I can re-use my existing hashes for my user accounts.

I would love to know why your ubuntu 14.04 system doesn't support sha512-crypt.

My dovecot installs have only ever used sha512-crypt since 2008. Been using ubuntu since 7.04 with sha512-crypt, and my current systems running 14.04 and 16.04 both use sha512-crypt.

The default password hash for system user accounts in ubuntu has been sha512-crypt for a very long time now.