Why is next.jdbc using my IP address?

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Lawrence Krubner

Mar 3, 2022, 2:18:06 PM3/3/22
to Clojure
I just wrote a small app that needs to connect to a MySQL app. I was running it on my laptop, connecting to MySQL on the laptop, and everything was working fine. Then I wanted to connect to one of our test databases in RDS in AWS. I've a simple function that finds the environment variables and returns them as a map:

(defn get-config
   :dbtype "mysql"
   :dbname (System/getenv "DATABASE_NAME")
   :user (System/getenv "DATABASE_USER")
   :password (System/getenv "DATABASE_PASSWORD")
   :host (System/getenv "DATABASE_HOST")

This is used simply:
  ds (jdbc/get-datasource  (get-config))

I've checked the environment values several times and they are correct. But when the code tries to write to the RDS database, I get: 

java.sql.SQLException: Access denied for user 'pulseuser'@'cpe-74-71-234-49.nyc.res.rr.com' (using password: YES)

I am connecting to the Internet through Spectrum, and apparently "rr.com" is Spectrum. I'm confused, why would next.jdbc use this info? Did I forget some important value in the hash map? 

From my laptop, I can reach the RDS database using the MySQL CLI, so there are no problems with connectivity. I whitelisted the IP address of my house. This is something specific about what next.jdbc needs in that hash map, I think.

Kevin Downey

Mar 3, 2022, 3:26:31 PM3/3/22
to clo...@googlegroups.com
That is a message from MySQL, not next.jdbc.

MySQL allows you to grant permissions to a user base on the host they are connecting from so permission denied kinds of errors include the username and the host the users connection came from.

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Lawrence Krubner

Mar 4, 2022, 6:27:32 AM3/4/22
to Clojure
But, again, I can connect from the cli using my terminal. I'm using my Spectrum connection to the Internet in both cases. If I run the app on my laptop, or I connect from the terminal, using the CLI, then in all cases I'm connecting over my Spectrum connection to the Internet. If MySQL was going to block one, then it would block the other, yes? I think the issue must have something to do with the Clojure code, since that is the only difference. I mean, if I do "java -jar user.jar" in the same terminal window, it fails, but then in that same terminal window I can connect to RDS without a problem using the CLI. 

Orestis Markou

Mar 4, 2022, 6:35:59 AM3/4/22
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The error message indicates that you connect with user `pulseuser` - is that the expected user? 

I would print out the configuration that you’re passing in to jdbc.next to be absolutely certain it contains the values you expect it does.

When you say “cli”, do you mean a mysql client? Double check the credentials (dbname, user, password) that *it* uses. 


Lawrence Krubner

Mar 4, 2022, 8:06:56 AM3/4/22
to Clojure

So, as a new way to test this, I've ssh'ed to an EC2 instance that is in the same VCP as the RDS database. I upload my jar file so I can run it on this EC2 instance.

println the hash map at startup:

{:dbtype mysql, :dbname pulsedata, :user pulseuser, :password xxxx, :host pulse-data.cclr8stksfch.us-west-2.rds.amazonaws.com}

This gets me the above error. But if I copy and paste the values and use them with the mysql client:

mysql -u pulseuser -h pulse-data.cclr8stksfch.us-west-2.rds.amazonaws.com -p pulsedata

I am able to log in. This is in the same terminal window: the MySQL client, at the command line in my terminal, logs me into MySQL, but "java -jar user.jar" in the same terminal window gives me this error, about me being rejected. I am copying and pasting the same values for user and host and password. 

It has to be something about the Clojure code. 

Lawrence Krubner

Mar 4, 2022, 8:58:28 AM3/4/22
to Clojure
Okay, this seems to have to do with characters acting as wildcards in the password itself. This is in the .env file:


but printlin in the Clojure code outputs:


The "$n" simply vanishes. 

Why is that? This is not a regular expression. I didn't think plain strings in Clojure would be interpreted like this. 

Or is this how bash interprets it? 

Orestis Markou

Mar 4, 2022, 9:10:00 AM3/4/22
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You might need to quote the string with single quotes, otherwise bash will probably try and interpolate a var `$n`...

Cora Sutton

Mar 4, 2022, 11:57:55 AM3/4/22
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And also change your password now.

Sean Corfield

Mar 4, 2022, 3:00:21 PM3/4/22
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> Okay, this seems to have to do with characters acting as wildcards in the password itself. This is in the .env file:

I don't know what library you are using for managing your configuration but perhaps it interprets $n as an environment variable called n and substitutes the value (which will be empty, in general).

Sean A Corfield -- (904) 302-SEAN
An Architect's View -- https://corfield.org/
World Singles Networks, LLC. -- https://worldsinglesnetworks.com/

"Perfection is the enemy of the good."
-- Gustave Flaubert, French realist novelist (1821-1880)
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