> For the complete documentation index, see [llms.txt](https://docs.tessell.com/tessell/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.tessell.com/tessell/database-engines/tessell-for-oracle/database-connections-using-ssl-tls/linux-platform.md).

# Linux platform

This guide covers connecting to a Tessell Oracle database service over SSL/TLS on Linux using SQL\*Plus.

***

## Step 1 — Install tools

1. Download and unzip the Oracle Instant Client from [Oracle Instant Client Downloads (Linux x86-64)](https://www.oracle.com/cis/database/technologies/instant-client/linux-x86-64-downloads.html).
2. Download and unzip SQLcl from [Oracle SQLcl Downloads](https://www.oracle.com/database/sqldeveloper/technologies/sqlcl/download/).

For example:

* Instant Client: `/home/ubuntu/<user>/instantclient_21_9`
* SQLcl: `/home/ubuntu/<user>/sqlcl`

***

## Step 2 — Set up `orapki`

Installing `orapki` directly from Oracle requires the full Fusion Middleware package. Use the following script instead to simulate `orapki` via SQLcl's bundled JARs:

```bash
#!/bin/bash
# set classpath for orapki - align this to your local SQLcl installation
SQLCL=<sqlcl unzipped path>/lib/   # e.g. /home/ubuntu/<user>/sqlcl/lib/
CLASSPATH=${SQLCL}/oraclepki.jar:${SQLCL}/osdt_core.jar:${SQLCL}/osdt_cert.jar
# simulate orapki command
java -classpath ${CLASSPATH} oracle.security.pki.textui.OraclePKITextUI "$@"
```

```bash
# Make orapki executable
chmod +x orapki
```

***

## Step 3 — Download the CA certificate

Download the CA certificate from the **Overview** tab of your DB service in Tessell (**My Services → Overview → CA Certificate**).

<div align="center"><img src="https://3421475909-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FXNKiIctERJykfezXfUU2%2Fuploads%2Fgit-blob-e164e1fc0feb4656cf68402a48eba3800c20a5a8%2Fimage.png?alt=media" alt="" width="800"></div>

<p align="center"><em>Figure 1 — CA Certificate download on the service Overview page</em></p>

***

## Step 4 — Create the Oracle wallet and import the certificate

1. Create the wallet directory:

```bash
./orapki wallet create -wallet /home/ubuntu/<user>/wallet/ -auto_login_only
```

2. Import the Tessell CA certificate:

```bash
./orapki wallet add -wallet /home/ubuntu/<user>/wallet/ -trusted_cert -cert TessellCA.crt -auto_login_only
```

3. Verify the certificate was imported:

```
./orapki wallet display -wallet /home/ubuntu/<user>/wallet/
Oracle PKI Tool Release 21.0.0.0.0 - Production
Version 21.0.0.0.0
Copyright (c) 2004, 2022, Oracle and/or its affiliates. All rights reserved.
Requested Certificates:
User Certificates:
Trusted Certificates:
Subject:        CN=tessell.com
```

***

## Step 5 — Configure `sqlnet.ora`

Create a `sqlnet.ora` file in `<instant_client_path>/network/admin` with the following content:

```
WALLET_LOCATION =
  (SOURCE =
   (METHOD = FILE)
   (METHOD_DATA =
    (DIRECTORY = /Users/<user>/orainscli/test_wallet)
   )
  )
SQLNET.AUTHENTICATION_SERVICES = (TCPS,NTS,BEQ)
SSL_CLIENT_AUTHENTICATION = FALSE
SSL_CIPHER_SUITES = (SSL_RSA_WITH_AES_256_CBC_SHA, SSL_RSA_WITH_3DES_EDE_CBC_SHA)
SSL_SERVER_DN_MATCH = ON
```

***

## Step 6 — Connect using SQL\*Plus

1. Download and install the SQL\*Plus package.
2. Set `ORACLE_HOME` to the Instant Client directory:

```bash
export ORACLE_HOME=/home/ubuntu/<user>/instantclient_21_9
```

3. Confirm `sqlnet.ora` is present in `$ORACLE_HOME/network/admin`.
4. Connect to the database:

```
sqlplus <user>/<password>@(DESCRIPTION = (ADDRESS = (PROTOCOL = TCPS)(HOST = oraclessl<service name>dnd-efwyu.qarel.tsl-barc.cloud)(PORT = 1521))(CONNECT_DATA = (SERVICE_NAME = <service name>))(SECURITY = (SSL_SERVER_CERT_DN = "CN=oraclessl<service name>dnd-efwyu.qarel.tsl-barc.cloud")))
```

> **Tip:** The Tessell service Overview page provides a pre-configured connection string you can use as a starting point.

5. Verify the connected protocol:

```sql
SELECT sys_context('USERENV', 'NETWORK_PROTOCOL') as network_protocol,
       sys_context('USERENV', 'AUTHENTICATION_METHOD') as authentication_method
FROM dual;
```

Expected output:

```
NETWORK_PROTOCOL                    AUTHENTICATION_METHOD
----------------------------------- -----------------------------------
tcps                                PASSWORD
```


---

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