Re: moving from mysql to pgsql

On 05/10/2017 02:06, Magnus wrote:

Hello,

I hope that this mailing list is "alive", since I am looking for a solution for my problem for a long time.

I would like to migrate my existing dovecot installation from mysql to pgsql. But I have problems with the passwords when using pgsql.

The existing and working mysql-based installation looks like this:

dovecot-sql.conf.ext:

driver = mysql default_pass_scheme = SHA512-CRYPT

Users are created like this:

INSERT INTO mls_user (idx,domain,password,email) VALUES (1,99,ENCRYPT('Test'),'mws@alpenjodel.de');

This setup is working, which I can verify like this:

$ telnet localhost 143

• OK [CAPABILITY IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID ENABLE IDLE AUTH=PLAIN AUTH=LOGIN AUTH=DIGEST-MD5 AUTH=CRAM-MD5] Dovecot ready.

a login mws@alpenjodel.de Test OK

Now let's take a look at the pgsql version of the setup:

dovecot-sql.conf.ext:

driver = pgsql default_pass_scheme = SHA512-CRYPT

Users are created like this:

INSERT INTO mls_user (idx,domain,password,email) VALUES (1,99,crypt('Test',gen_salt('des')),'mws@alpenjodel.de');

This setup is not working:

$ telnet localhost 143

• OK [CAPABILITY IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID ENABLE IDLE AUTH=PLAIN AUTH=LOGIN AUTH=DIGEST-MD5 AUTH=CRAM-MD5] Dovecot ready.

a login mws@alpenjodel.de Test a NO [AUTHENTICATIONFAILED] Authentication failed.

Assumptions:

• I believe that the mysql encrypt function uses the crypt system call, which in turn uses the DES algorithm with a random salt.

• I believe that the same is done with the pgsql function call crypt('Test',gen_salt('des')).

But obviously some of these assumptions must be wrong.

Besides that, the variable "default_pass_scheme" is set to "SHA512-CRYPT" in both cases. But obviously, not SHA but DES is used by the working mysql-based setup. I don't understand that. Could someone please explain the relationship between the default_pass_scheme variable and the encryption/hashing algorithm used to store the user passwords?

And finally: What can I do to migrate to pgsql?

Thank you Magnus

Migrate? if the passwords are truly as designed already, it shouldnt matter, it should read them, be it for mail, ftp, or httpd, they all read the same thing mysql, or anything that reads sha512.

What are you using to insert users, php? perl? , what does the database entry look like?

We use a perl backend to add members and hosts, in mysql mypassword field is populated as crypt($password, '$6$' . $salt)

I can't help you if its php, i'll leave that for someone who knows php and my php guru is off sick this week with the flu

But does your database password field entry start with $6$ ? perhaps your mysql isnt using what you think?

As a test, this is testing123 in sha512

$6$Z6I5oyWUed.tmNUs$0ScF2w3ejPWFAX/3F6DgMyWpbXLq0DD6blL8rwBpSHGWaZ9RiXlpo5PPZFoJPZWIuQMETELsXG2YtbsAc8K3q/

copy and paste that into a test users mysql password field directly, and your pgsql directly and see if it works.

incidentally, we use

default_pass_scheme = CRYPT

Which handles all the subsystems crypt options including sha's - providing your system is half modern, if its ten years old dont use that, it'll be likely using the old 8 char limited crypt :) (and dont laugh the number of antique debian and RH boxes I've come across is scary)

anyway, so even as a fallback for testing you could insert even an md5 hash into a password field and it will work as well, I wont tell you not to do this in production because of course you know better ;)

-- Kind Regards,

Noel Butler

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