2020/10/27: Difference between revisions

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* Meanwhile, Dovecot on the new cloud1 server ''is'' working -- but MySQL refuses to accept connections from MySQL Workbench, making it difficult to set up databases, which makes it difficult (though not impossible) to set up Roundcube there.
* Meanwhile, Dovecot on the new cloud1 server ''is'' working -- but MySQL refuses to accept connections from MySQL Workbench, making it difficult to set up databases, which makes it difficult (though not impossible) to set up Roundcube there.


I'm focusing on fixing the MySQL issue, as that is a blocker on several issues.
Breaking this down into two major pieces:
 
* [[/db]]: I'm focusing on fixing the MySQL issue, as that is a blocker on several issues.
One symptom: MySQL on cloud5 (which works properly) will only let me connect via CLI if I have a username and password. MySQL on cloud1 (not working for ssh tunnel connections) will let me connect from CLI with or without a username and with or without a password.<ref name=upd1 />
* [[/email]]
 
After looking extensively at configuration files, one relevant difference seems to be the GRANTS (<code>SHOW GRANTS FOR 'root'@'localhost';</code>):
<table width=100%><caption>'''cloud1''' (kind of not working)</caption>
<tr><td>
Grants for root@localhost
</td></tr>
<tr><td>
<source lang=mysql>
GRANT ALL PRIVILEGES ON *.*
  TO `root`@`localhost`
  IDENTIFIED VIA mysql_native_password
  USING 'invalid' OR unix_socket
  WITH GRANT OPTION
GRANT PROXY ON ''@'%'
  TO 'root'@'localhost'
  WITH GRANT OPTION
</source>
</td></tr>
<tr><td>
2 rows in set (0.000 sec)
</td></tr></table>
 
<table><caption>'''cloud5''' (working properly)</caption>
<tr><td>
Grants for root@localhost                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              </td></tr>
<tr><td>
<source lang=mysql>
GRANT
  SELECT, INSERT, UPDATE, DELETE, CREATE, DROP, RELOAD, SHUTDOWN,
  PROCESS, FILE, REFERENCES, INDEX, ALTER, SHOW DATABASES, SUPER,
  CREATE TEMPORARY TABLES, LOCK TABLES, EXECUTE, REPLICATION SLAVE,
  REPLICATION CLIENT, CREATE VIEW, SHOW VIEW, CREATE ROUTINE, ALTER ROUTINE,
  CREATE USER, EVENT, TRIGGER, CREATE TABLESPACE, CREATE ROLE, DROP ROLE
ON *.* TO `root`@`localhost` WITH GRANT OPTION                                                                                                                                             
 
GRANT 
  APPLICATION_PASSWORD_ADMIN,
  AUDIT_ADMIN,BACKUP_ADMIN,
  BINLOG_ADMIN,
  BINLOG_ENCRYPTION_ADMIN,
  CLONE_ADMIN,
  CONNECTION_ADMIN,
  ENCRYPTION_KEY_ADMIN,
  GROUP_REPLICATION_ADMIN,
  INNODB_REDO_LOG_ARCHIVE,
  INNODB_REDO_LOG_ENABLE,
  PERSIST_RO_VARIABLES_ADMIN,
  REPLICATION_APPLIER,
  REPLICATION_SLAVE_ADMIN,
  RESOURCE_GROUP_ADMIN,
  RESOURCE_GROUP_USER,
  ROLE_ADMIN,
  SERVICE_CONNECTION_ADMIN,
  SESSION_VARIABLES_ADMIN,
  SET_USER_ID,
  SHOW_ROUTINE,
  SYSTEM_USER,
  SYSTEM_VARIABLES_ADMIN,
  TABLE_ENCRYPTION_ADMIN,
  XA_RECOVER_ADMIN
ON *.* TO `root`@`localhost` WITH GRANT OPTION
 
GRANT PROXY ON ''@'' TO 'root'@'localhost' WITH GRANT OPTION
</source>
</td></tr>
<tr><td>
3 rows in set (0.00 sec)
</td></tr></table>
Trying to apply the cloud5 settings to cloud1, I get this for the first GRANT query:
<blockquote>
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'ROLE, DROP ROLE ON *.* TO `root`@`localhost` WITH GRANT OPTION' at line 1
</blockquote>
 
Sooo... let's take a closer look at what the cloud1 setup does.
<table>
<tr><td><code>GRANT ALL PRIVILEGES ON *.*</code></td>          <td>this user is God</td></tr>
<tr><td><code>  TO `root`@`localhost`</code></td>              <td>only if connected locally</td></tr>
<tr><td><code>  IDENTIFIED VIA mysql_native_password</code></td><td>[https://mariadb.com/kb/en/authentication-plugin-mysql_native_password/ mysql_native_password plugin]</td></tr>
<tr><td><code>  USING 'invalid' OR unix_socket</code></td>      <td>"invalid" is maybe like saying FALSE -- it won't ever work? ...leaving unix_socket as the only viable option</td></tr>
<tr><td><code>  WITH GRANT OPTION</code></td>                  <td>allow user to create other users with same privileges</td></tr>
</table>
 
Let's try
<source lang=mysql>GRANT ALL PRIVILEGES ON *.*
  TO `root`@`localhost`
  IDENTIFIED VIA ed25519
  USING PASSWORD('password_here') OR unix_socket
  WITH GRANT OPTION
</source>
That gives me
: ERROR 1524 (HY000): Plugin 'ed25519' is not loaded
<source lang=mysql>INSTALL SONAME 'auth_ed25519';</source>
: Query OK, 0 rows affected (0.002 sec)
Trying the GRANT again...
: Query OK, 0 rows affected (0.001 sec)
 
Now when I try to connect with Workbench, I get a much quicker error about not being able to load the ed25519 plugin. Okay, so we need to make that automatic...
 
Unfortunately, the client_ed25519 plugin seems to be separate from auth_ed25519? [https://askubuntu.com/questions/1202462/how-do-i-authenticate-with-ed25519-using-the-mariadb-client this page] suggested a package to install in order to get the client library, and I did, but it still didn't work. [https://bugs.launchpad.net/ubuntu/+source/mariadb-10.1/+bug/1859341 This post] suggests that the problem has been fixed, but... kinda no.
 
For now, then, let's try the default plugin, if there is one.
<source lang=mysql>GRANT ALL PRIVILEGES ON *.* TO 'root'@'localhost' IDENTIFIED BY '[password]' WITH GRANT OPTION;</source>
This finally worked.
==Footnote==
<references>
<ref name=upd1>'''Update''': [https://mariadb.com/kb/en/authentication-plugins/ this page] seems to explain this behavior: "The root@localhost user created by mysql_install_db is created with the ability to use two authentication plugins. First, it is configured to try to use the unix_socket authentication plugin. This allows the the root@localhost user to login without a password via the local Unix socket file defined by the socket system variable, as long as the login is attempted from a process owned by the operating system root user account. Second, if authentication fails with the unix_socket authentication plugin, then it is configured to try to use the mysql_native_password authentication plugin. However, an invalid password is initially set, so in order to authenticate this way, a password must be set with SET PASSWORD."</ref>
</references>

Revision as of 19:48, 27 October 2020

I've got a bit of a double-bind situation here...

  • Email retrieval on cloud5 (where it had been for some months) stopped working when I upgraded Ubuntu to 20.04. Dovecot gives errors on IMAP and POP3. Postfix (SMTP) is still working, and we are able to access email via Roundcube, but not desktop or mobile clients.
  • Meanwhile, Dovecot on the new cloud1 server is working -- but MySQL refuses to accept connections from MySQL Workbench, making it difficult to set up databases, which makes it difficult (though not impossible) to set up Roundcube there.

Breaking this down into two major pieces:

  • /db: I'm focusing on fixing the MySQL issue, as that is a blocker on several issues.
  • /email
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