# Type of request: This is a ...
[X] bug report
[ ] feature request

# Detailed description
I try to configure SSL to work with a certificate bundle from my CA.
Here's an excerpt from my `docker-compose.yml` 


```
  localstack:
    image: localstack/localstack
    ports:
      - 4566:4566
      - "${PORT_WEB_UI-8080}:${PORT_WEB_UI-8080}"
    environment:
      - LOCALSTACK_SERVICES=s3,secretsmanager
      - LOCALSTACK_DEFAULT_REGION=us-east-1
      - LOCALSTACK_USE_SSL=true
      - LOCALSTACK_DATA_DIR=/tmp/localstack/data
      - LOCALSTACK_PORT_WEB_UI=8080
      - LOCALSTACK_HOSTNAME=aws.local.domain.com
    volumes:
      - "${TMPDIR:-/tmp/localstack}:/tmp/localstack"
      - ./support/docker/localstack/aws.local.domain.com.pem:/tmp/localstack/server.test.pem
      - ./support/docker/localstack/aws.local.domain.com.crt:/tmp/localstack/server.test.pem.crt
      - ./support/docker/localstack/aws.local.domain.com.key:/tmp/localstack/server.test.pem.key
```

My `.pem` file has the following format:


```
-----BEGIN RSA PRIVATE KEY-----
-----END RSA PRIVATE KEY-----
-----BEGIN CERTIFICATE-----
-----END CERTIFICATE-----
```

Here's what I see in `localstack` container logs when I run `docker-compose up`:


```
localstack | Waiting for all LocalStack services to be ready
localstack | Starting edge router (https port 4566)...
localstack | Starting mock S3 service in https ports 4566 (recommended) and 4572 (deprecated)...
localstack | 2020-05-31T16:22:20:INFO:localstack.utils.common: Unable to store key/cert files for custom SSL certificate: substring not found
localstack | 2020-05-31T16:22:20:INFO:localstack.multiserver: Starting multi API server process on port 34651
localstack | 2020-05-31T16:22:20:INFO:localstack.utils.common: Unable to store key/cert files for custom SSL certificate: substring not found
localstack | Starting mock Secrets Manager service in https ports 4566 (recommended) and 4584 (deprecated)...
localstack | 2020-05-31T16:22:21:INFO:localstack.utils.common: Unable to store key/cert files for custom SSL certificate: substring not found
localstack | Waiting for all LocalStack services to be ready
localstack | Ready.
```

I also have `aws.local.domain.com` in my `/etc/hosts` file pointing to `127.0.0.1`

...

## Expected behavior
I should be able to issue AWS CLI commands successfully. 
...

## Actual behavior
Here's the output from AWS CLI:


```
$ aws --endpoint-url=https://aws.local.domain.com:4566 s3 ls

SSL validation failed for https://aws.local.domain.com:4566/ [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1076)
```

...

Is there anything I'm missing?



┆Issue is synchronized with this [Jira Bug](https://localstack.atlassian.net/browse/LOC-192) by [Unito](https://www.unito.io/learn-more)

return self._stream_value(self._stdout)
    def stderr(self):
        return self._stream_value(self._stderr)
    def _stream_value(self, stream):
        return stream.getvalue() if hasattr(stream, 'getvalue') else stream
def start_thread(method, *args, **kwargs):
    _shutdown_hook = kwargs.pop('_shutdown_hook', True)
    thread = FuncThread(method, *args, **kwargs)
    thread.start()
    if _shutdown_hook:
        TMP_THREADS.append(thread)
    return thread
def start_worker_thread(method, *args, **kwargs):
    return start_thread(method, *args, _shutdown_hook=False, **kwargs)
def empty_context_manager():
    import contextlib
    return contextlib.nullcontext()
def synchronized(lock=None):
    """
    Synchronization decorator as described in
    http://blog.dscpl.com.au/2014/01/the-missing-synchronized-decorator.html.
    """
    def _decorator(wrapped):
        @functools.wraps(wrapped)
        def _wrapper(*args, **kwargs):
            with lock:
                return wrapped(*args, **kwargs)
        return _wrapper
    return _decorator
def prevent_stack_overflow(match_parameters=False):