# 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)

if config.EDGE_PORT_HTTP:
        result = 'ports %s/%s' % (config.EDGE_PORT, config.EDGE_PORT_HTTP)
    else:
        result = 'port %s' % config.EDGE_PORT
    result = '%s %s' % (get_service_protocol(), result)
    return result
def timestamp(time=None, format=TIMESTAMP_FORMAT):
    if not time:
        time = datetime.utcnow()
    if isinstance(time, six.integer_types + (float, )):
        time = datetime.fromtimestamp(time)
    return time.strftime(format)
def timestamp_millis(time=None):
    microsecond_time = timestamp(time=time, format=TIMESTAMP_FORMAT_MICROS)
    
    return microsecond_time[:-4] + microsecond_time[-1]
def epoch_timestamp():
    return time.time()
def retry(function, retries=3, sleep=1, sleep_before=0, **kwargs):
    raise_error = None
    if sleep_before > 0:
        time.sleep(sleep_before)
    for i in range(0, retries + 1):
        try:
            return function(**kwargs)
        except Exception as error:
            raise_error = error
            time.sleep(sleep)
    raise raise_error
def dump_thread_info():