Add support for sslcert, sslkey and sslrootcert parameters to DSN (MagicStack#768)

Co-authored-by: Elvis Pranskevichus <elvis@edgedb.com>

Author: jdobes

asyncpg/_testbase/__init__.py

@@ -330,8 +330,10 @@ def tearDownClass(cls):
  @classmethod
  def get_connection_spec(cls, kwargs={}):
  conn_spec = cls.cluster.get_connection_spec()
+ if kwargs.get('dsn'):
+ conn_spec.pop('host')
  conn_spec.update(kwargs)
- if not os.environ.get('PGHOST'):
+ if not os.environ.get('PGHOST') and not kwargs.get('dsn'):
  if 'database' not in conn_spec:
  conn_spec['database'] = 'postgres'
  if 'user' not in conn_spec:

asyncpg/connect_utils.py

@@ -226,6 +226,7 @@ def _parse_connect_dsn_and_args(*, dsn, host, port, user,
  # `auth_hosts` is the version of host information for the purposes
  # of reading the pgpass file.
  auth_hosts = None
+ sslcert = sslkey = sslrootcert = sslcrl = None
 
  if dsn:
  parsed = urllib.parse.urlparse(dsn)
@@ -310,6 +311,26 @@ def _parse_connect_dsn_and_args(*, dsn, host, port, user,
  if ssl is None:
  ssl = val
 
+ if 'sslcert' in query:
+ val = query.pop('sslcert')
+ if sslcert is None:
+ sslcert = val
+
+ if 'sslkey' in query:
+ val = query.pop('sslkey')
+ if sslkey is None:
+ sslkey = val
+
+ if 'sslrootcert' in query:
+ val = query.pop('sslrootcert')
+ if sslrootcert is None:
+ sslrootcert = val
+
+ if 'sslcrl' in query:
+ val = query.pop('sslcrl')
+ if sslcrl is None:
+ sslcrl = val
+
  if query:
  if server_settings is None:
  server_settings = query
@@ -427,15 +448,38 @@ def _parse_connect_dsn_and_args(*, dsn, host, port, user,
  '`sslmode` parameter must be one of: {}'.format(modes))
 
  # docs at https://www.postgresql.org/docs/10/static/libpq-connect.html
- # Not implemented: sslcert & sslkey & sslrootcert & sslcrl params.
  if sslmode < SSLMode.allow:
  ssl = False
  else:
- ssl = ssl_module.create_default_context()
+ ssl = ssl_module.create_default_context(
+ ssl_module.Purpose.SERVER_AUTH)
  ssl.check_hostname = sslmode >= SSLMode.verify_full
  ssl.verify_mode = ssl_module.CERT_REQUIRED
  if sslmode <= SSLMode.require:
  ssl.verify_mode = ssl_module.CERT_NONE
+
+ if sslcert is None:
+ sslcert = os.getenv('PGSSLCERT')
+
+ if sslkey is None:
+ sslkey = os.getenv('PGSSLKEY')
+
+ if sslrootcert is None:
+ sslrootcert = os.getenv('PGSSLROOTCERT')
+
+ if sslcrl is None:
+ sslcrl = os.getenv('PGSSLCRL')
+
+ if sslcert:
+ ssl.load_cert_chain(sslcert, keyfile=sslkey)
+
+ if sslrootcert:
+ ssl.load_verify_locations(cafile=sslrootcert)
+
+ if sslcrl:
+ ssl.load_verify_locations(cafile=sslcrl)
+ ssl.verify_flags |= ssl_module.VERIFY_CRL_CHECK_CHAIN
+
  elif ssl is True:
  ssl = ssl_module.create_default_context()
  sslmode = SSLMode.verify_full

asyncpg/connection.py

@@ -1787,10 +1787,11 @@ async def connect(dsn=None, *,
  Connection arguments specified using as a single string in the
  `libpq connection URI format`_:
  ``postgres://user:password@host:port/database?option=value``.
- The following options are recognized by asyncpg: host, port,
- user, database (or dbname), password, passfile, sslmode.
- Unlike libpq, asyncpg will treat unrecognized options
- as `server settings`_ to be used for the connection.
+ The following options are recognized by asyncpg: ``host``,
+ ``port``, ``user``, ``database`` (or ``dbname``), ``password``,
+ ``passfile``, ``sslmode``, ``sslcert``, ``sslkey``, ``sslrootcert``,
+ and ``sslcrl``. Unlike libpq, asyncpg will treat unrecognized
+ options as `server settings`_ to be used for the connection.
 
  .. note::
 
@@ -1912,6 +1913,51 @@ async def connect(dsn=None, *,
 
  *ssl* is ignored for Unix domain socket communication.
 
+ Example of programmatic SSL context configuration that is equivalent
+ to ``sslmode=verify-full&sslcert=..&sslkey=..&sslrootcert=..``:
+
+ .. code-block:: pycon
+
+ >>> import asyncpg
+ >>> import asyncio
+ >>> import ssl
+ >>> async def main():
+ ... # Load CA bundle for server certificate verification,
+ ... # equivalent to sslrootcert= in DSN.
+ ... sslctx = ssl.create_default_context(
+ ... ssl.Purpose.SERVER_AUTH,
+ ... cafile="path/to/ca_bundle.pem")
+ ... # If True, equivalent to sslmode=verify-full, if False:
+ ... # sslmode=verify-ca.
+ ... sslctx.check_hostname = True
+ ... # Load client certificate and private key for client
+ ... # authentication, equivalent to sslcert= and sslkey= in
+ ... # DSN.
+ ... sslctx.load_cert_chain(
+ ... "path/to/client.cert",
+ ... keyfile="path/to/client.key",
+ ... )
+ ... con = await asyncpg.connect(user='postgres', ssl=sslctx)
+ ... await con.close()
+ >>> asyncio.run(run())
+
+ Example of programmatic SSL context configuration that is equivalent
+ to ``sslmode=require`` (no server certificate or host verification):
+
+ .. code-block:: pycon
+
+ >>> import asyncpg
+ >>> import asyncio
+ >>> import ssl
+ >>> async def main():
+ ... sslctx = ssl.create_default_context(
+ ... ssl.Purpose.SERVER_AUTH)
+ ... sslctx.check_hostname = False
+ ... sslctx.verify_mode = ssl.CERT_NONE
+ ... con = await asyncpg.connect(user='postgres', ssl=sslctx)
+ ... await con.close()
+ >>> asyncio.run(run())
+
  :param dict server_settings:
  An optional dict of server runtime parameters. Refer to
  PostgreSQL documentation for
@@ -1970,6 +2016,10 @@ async def connect(dsn=None, *,
  .. versionchanged:: 0.22.0
  The *ssl* argument now defaults to ``'prefer'``.
 
+ .. versionchanged:: 0.24.0
+ The ``sslcert``, ``sslkey``, ``sslrootcert``, and ``sslcrl`` options
+ are supported in the *dsn* argument.
+
  .. _SSLContext: https://docs.python.org/3/library/ssl.html#ssl.SSLContext
  .. _create_default_context:
  https://docs.python.org/3/library/ssl.html#ssl.create_default_context

tests/certs/client.cert.pem

@@ -0,0 +1,24 @@
+-----BEGIN CERTIFICATE-----
+MIIEAzCCAuugAwIBAgIUPfej8IQ/5bCrihqWImrq2vKPOq0wDQYJKoZIhvcNAQEL
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+8NajoAZfJ+QD50DrbF5E00yovZbyIB4=
+-----END CERTIFICATE-----

tests/certs/client.csr.pem

@@ -0,0 +1,18 @@
+-----BEGIN CERTIFICATE REQUEST-----
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+-----END CERTIFICATE REQUEST-----

tests/certs/client.key.pem

@@ -0,0 +1,27 @@
+-----BEGIN RSA PRIVATE KEY-----
+MIIEowIBAAKCAQEAmOI/0iT8pFEsr0Yy+gfybUs74bKuvwbPfoumYokxH8+nBMv7
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+-----END RSA PRIVATE KEY-----

tests/certs/client_ca.cert.pem

@@ -0,0 +1,25 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----

tests/certs/client_ca.cert.srl

@@ -0,0 +1 @@
+3DF7A3F0843FE5B0AB8A1A96226AEADAF28F3AAD

tests/certs/client_ca.key.pem

@@ -0,0 +1,27 @@
+-----BEGIN RSA PRIVATE KEY-----
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+-----END RSA PRIVATE KEY-----