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Fix SSL hostname verification bug and update env var names #83

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079ebd6
Fix SSL hostname verification bug and update env var names
taylorleese Nov 4, 2025
c4b84f7
style: format src/common/config.py
vchomakov Nov 4, 2025
c7bd0ad
fix: add ssl_check_hostname to connection test mocks
vchomakov Nov 5, 2025
63ad961
docs: fix env var name in SSL config table
vchomakov Nov 18, 2025
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1 change: 1 addition & 0 deletions .env.example
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Original file line number Diff line number Diff line change
Expand Up @@ -9,4 +9,5 @@ REDIS_SSL_KEYFILE=/path/to/key.pem
REDIS_SSL_CERTFILE=/path/to/cert.pem
REDIS_SSL_CERT_REQS=required
REDIS_SSL_CA_CERTS=/path/to/ca_certs.pem
REDIS_SSL_CHECK_HOSTNAME=true
REDIS_CLUSTER_MODE=False
29 changes: 15 additions & 14 deletions README.md
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Expand Up @@ -336,20 +336,21 @@ uvx --from redis-mcp-server@latest redis-mcp-server --help

If desired, you can use environment variables. Defaults are provided for all variables.

| Name | Description | Default Value |
|----------------------|-----------------------------------------------------------|---------------|
| `REDIS_HOST` | Redis IP or hostname | `"127.0.0.1"` |
| `REDIS_PORT` | Redis port | `6379` |
| `REDIS_DB` | Database | 0 |
| `REDIS_USERNAME` | Default database username | `"default"` |
| `REDIS_PWD` | Default database password | "" |
| `REDIS_SSL` | Enables or disables SSL/TLS | `False` |
| `REDIS_SSL_CA_PATH` | CA certificate for verifying server | None |
| `REDIS_SSL_KEYFILE` | Client's private key file for client authentication | None |
| `REDIS_SSL_CERTFILE` | Client's certificate file for client authentication | None |
| `REDIS_SSL_CERT_REQS`| Whether the client should verify the server's certificate | `"required"` |
| `REDIS_SSL_CA_CERTS` | Path to the trusted CA certificates file | None |
| `REDIS_CLUSTER_MODE` | Enable Redis Cluster mode | `False` |
| Name | Description | Default Value |
|----------------------------|------------------------------------------------------------------- |---------------|
| `REDIS_HOST` | Redis IP or hostname | `"127.0.0.1"` |
| `REDIS_PORT` | Redis port | `6379` |
| `REDIS_DB` | Database | 0 |
| `REDIS_USERNAME` | Default database username | `"default"` |
| `REDIS_PWD` | Default database password | "" |
| `REDIS_SSL` | Enables or disables SSL/TLS | `False` |
| `REDIS_SSL_CA_PATH` | CA certificate path for verifying server | None |
| `REDIS_SSL_KEYFILE` | Client's private key file for client authentication | None |
| `REDIS_SSL_CERTFILE` | Client's certificate file for client authentication | None |
| `REDIS_SSL_CERT_REQS` | Certificate requirements (none, optional, or required) | `"required"` |
| `REDIS_SSL_CA_CERTS` | Path to the trusted CA certificates file | None |
| `REDIS_SSL_CHECK_HOSTNAME` | Verify SSL certificate hostname (auto-disabled when cert_reqs=none)| `True` |
| `REDIS_CLUSTER_MODE` | Enable Redis Cluster mode | `False` |

### EntraID Authentication for Azure Managed Redis

Expand Down
13 changes: 13 additions & 0 deletions src/common/config.py
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Expand Up @@ -27,6 +27,13 @@
"db": int(os.getenv("REDIS_DB", 0)),
}

# When ssl_cert_reqs is "none", we should disable hostname checking by default
# This matches the behavior of redis-cli --insecure flag
default_check_hostname = "false" if REDIS_CFG["ssl_cert_reqs"] == "none" else "true"
REDIS_CFG["ssl_check_hostname"] = os.getenv(
"REDIS_SSL_CHECK_HOSTNAME", default_check_hostname
) in ("true", "1", "t")

# Entra ID Authentication Configuration
ENTRAID_CFG = {
# Authentication flow selection
Expand Down Expand Up @@ -125,6 +132,12 @@ def parse_redis_uri(uri: str) -> dict:
config["ssl_keyfile"] = query_params["ssl_keyfile"][0]
if "ssl_certfile" in query_params:
config["ssl_certfile"] = query_params["ssl_certfile"][0]
if "ssl_check_hostname" in query_params:
config["ssl_check_hostname"] = query_params["ssl_check_hostname"][0] in (
"true",
"1",
"t",
)

# Handle other parameters. According to https://www.iana.org/assignments/uri-schemes/prov/redis,
# The database number to use for the Redis SELECT command comes from
Expand Down
2 changes: 2 additions & 0 deletions src/common/connection.py
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Expand Up @@ -48,6 +48,7 @@ def get_connection(cls, decode_responses=True) -> Redis:
"ssl_certfile": REDIS_CFG["ssl_certfile"],
"ssl_cert_reqs": REDIS_CFG["ssl_cert_reqs"],
"ssl_ca_certs": REDIS_CFG["ssl_ca_certs"],
"ssl_check_hostname": REDIS_CFG["ssl_check_hostname"],
"decode_responses": decode_responses,
"lib_name": f"redis-py(mcp-server_v{__version__})",
"max_connections_per_node": 10,
Expand All @@ -72,6 +73,7 @@ def get_connection(cls, decode_responses=True) -> Redis:
"ssl_certfile": REDIS_CFG["ssl_certfile"],
"ssl_cert_reqs": REDIS_CFG["ssl_cert_reqs"],
"ssl_ca_certs": REDIS_CFG["ssl_ca_certs"],
"ssl_check_hostname": REDIS_CFG["ssl_check_hostname"],
"decode_responses": decode_responses,
"lib_name": f"redis-py(mcp-server_v{__version__})",
"max_connections": 10,
Expand Down
86 changes: 86 additions & 0 deletions tests/test_config.py
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Expand Up @@ -80,6 +80,22 @@ def test_parse_uri_with_ssl_parameters(self):
assert result["ssl_certfile"] == "/cert.pem"
assert result["ssl_ca_path"] == "/ca.pem"

def test_parse_uri_with_ssl_check_hostname(self):
"""Test parsing URI with ssl_check_hostname query parameter."""
uri = "rediss://localhost:6379/0?ssl_check_hostname=false"
result = parse_redis_uri(uri)

assert result["ssl"] is True
assert result["ssl_check_hostname"] is False

def test_parse_uri_with_ssl_check_hostname_true(self):
"""Test parsing URI with ssl_check_hostname set to true."""
uri = "rediss://localhost:6379/0?ssl_check_hostname=true"
result = parse_redis_uri(uri)

assert result["ssl"] is True
assert result["ssl_check_hostname"] is True

def test_parse_uri_defaults(self):
"""Test parsing URI with default values."""
uri = "redis://example.com"
Expand Down Expand Up @@ -286,3 +302,73 @@ def test_config_from_environment(self, mock_load_dotenv):
assert config["port"] == 6380
assert config["ssl"] is True
assert config["cluster_mode"] is True

@patch.dict(
os.environ,
{
"REDIS_SSL": "true",
"REDIS_SSL_CERT_REQS": "none",
},
)
@patch("src.common.config.load_dotenv")
def test_ssl_check_hostname_disabled_with_cert_reqs_none(self, mock_load_dotenv):
"""Test that ssl_check_hostname is disabled by default when ssl_cert_reqs is none."""
# Re-import to get fresh config
import importlib

import src.common.config

importlib.reload(src.common.config)

config = src.common.config.REDIS_CFG

assert config["ssl"] is True
assert config["ssl_cert_reqs"] == "none"
assert config["ssl_check_hostname"] is False

@patch.dict(
os.environ,
{
"REDIS_SSL": "true",
"REDIS_SSL_CERT_REQS": "required",
},
)
@patch("src.common.config.load_dotenv")
def test_ssl_check_hostname_enabled_with_cert_reqs_required(self, mock_load_dotenv):
"""Test that ssl_check_hostname is enabled by default when ssl_cert_reqs is required."""
# Re-import to get fresh config
import importlib

import src.common.config

importlib.reload(src.common.config)

config = src.common.config.REDIS_CFG

assert config["ssl"] is True
assert config["ssl_cert_reqs"] == "required"
assert config["ssl_check_hostname"] is True

@patch.dict(
os.environ,
{
"REDIS_SSL": "true",
"REDIS_SSL_CERT_REQS": "none",
"REDIS_SSL_CHECK_HOSTNAME": "true",
},
)
@patch("src.common.config.load_dotenv")
def test_ssl_check_hostname_override(self, mock_load_dotenv):
"""Test that ssl_check_hostname can be explicitly overridden."""
# Re-import to get fresh config
import importlib

import src.common.config

importlib.reload(src.common.config)

config = src.common.config.REDIS_CFG

assert config["ssl"] is True
assert config["ssl_cert_reqs"] == "none"
assert config["ssl_check_hostname"] is True
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