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"""
Manage KMS keys, key policies and grants.
.. versionadded:: 2015.8.0
Be aware that this interacts with Amazon's services, and so may incur charges.
This module uses ``boto``, which can be installed via package, or pip.
This module accepts explicit kms credentials but can also utilize
IAM roles assigned to the instance through Instance Profiles. Dynamic
credentials are then automatically obtained from AWS API and no further
configuration is necessary. More information available `here
<http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/iam-roles-for-amazon-ec2.html>`_.
If IAM roles are not used you need to specify them either in a pillar file or
in the minion's config file:
.. code-block:: yaml
elb.keyid: GKTADJGHEIQSXMKKRBJ08H
elb.key: askdjghsdfjkghWupUjasdflkdfklgjsdfjajkghs
It's also possible to specify ``key``, ``keyid`` and ``region`` via a profile,
either passed in as a dict, or as a string to pull from pillars or minion
config:
.. code-block:: yaml
myprofile:
keyid: GKTADJGHEIQSXMKKRBJ08H
key: askdjghsdfjkghWupUjasdflkdfklgjsdfjajkghs
region: us-east-1
.. code-block:: yaml
Ensure mykey key exists:
boto_kms.key_present:
- name: mykey
- region: us-east-1
# Using a profile from pillars
Ensure mykey key exists:
boto_kms.key_present:
- name: mykey
- region: us-east-1
- profile: myprofile
# Passing in a profile
Ensure mykey key exists:
boto_key.key_present:
- name: mykey
- region: us-east-1
- profile:
keyid: GKTADJGHEIQSXMKKRBJ08H
key: askdjghsdfjkghWupUjasdflkdfklgjsdfjajkghs
"""
import salt.utils.dictupdate as dictupdate
from salt.exceptions import SaltInvocationError
def __virtual__():
"""
Only load if boto is available.
"""
if "boto_kms.describe_key" in __salt__:
return "boto_kms"
return (False, "boto_kms module could not be loaded")
def key_present(
name,
policy,
description=None,
key_usage=None,
grants=None,
manage_grants=False,
key_rotation=False,
enabled=True,
region=None,
key=None,
keyid=None,
profile=None,
):
"""
Ensure the KMS key exists. KMS keys can not be deleted, so this function
must be used to ensure the key is enabled or disabled.
name
Name of the key.
policy
Key usage policy.
description
Description of the key.
key_usage
Specifies the intended use of the key. Can only be set on creation,
defaults to ENCRYPT_DECRYPT, which is also the only supported option.
grants
A list of grants to apply to the key. Not currently implemented.
manage_grants
Whether or not to manage grants. False by default, which will not
manage any grants.
key_rotation
Whether or not key rotation is enabled for the key. False by default.
enabled
Whether or not the key is enabled. True by default.
region
Region to connect to.
key
Secret key to be used.
keyid
Access key to be used.
profile
A dict with region, key and keyid, or a pillar key (string)
that contains a dict with region, key and keyid.
"""
if not policy:
raise SaltInvocationError("policy is a required argument.")
if grants and not isinstance(grants, list):
raise SaltInvocationError("manage_grants must be a list.")
if not isinstance(manage_grants, bool):
raise SaltInvocationError("manage_grants must be true or false.")
if not isinstance(key_rotation, bool):
raise SaltInvocationError("key_rotation must be true or false.")
if not isinstance(enabled, bool):
raise SaltInvocationError("enabled must be true or false.")
# TODO: support grant from pillars.
# TODO: support key policy from pillars.
ret = {"name": name, "result": True, "comment": "", "changes": {}}
_ret = _key_present(
name,
policy,
description,
key_usage,
key_rotation,
enabled,
region,
key,
keyid,
profile,
)
ret["changes"] = dictupdate.update(ret["changes"], _ret["changes"])
ret["comment"] = " ".join([ret["comment"], _ret["comment"]])
if not _ret["result"]:
ret["result"] = _ret["result"]
if ret["result"] is False:
return ret
# TODO: add grants_present function
return ret
def _key_present(
name,
policy,
description,
key_usage,
key_rotation,
enabled,
region,
key,
keyid,
profile,
):
ret = {"result": True, "comment": "", "changes": {}}
alias = f"alias/{name}"
r = __salt__["boto_kms.key_exists"](alias, region, key, keyid, profile)
if "error" in r:
ret["result"] = False
ret["comment"] = "Error when attempting to find key: {}.".format(
r["error"]["message"]
)
return ret
if not r["result"]:
if __opts__["test"]:
ret["comment"] = "Key is set to be created."
ret["result"] = None
return ret
rc = __salt__["boto_kms.create_key"](
policy, description, key_usage, region, key, keyid, profile
)
if "error" in rc:
ret["result"] = False
ret["comment"] = "Failed to create key: {}".format(rc["error"]["message"])
return ret
key_metadata = rc["key_metadata"]
kms_key_id = key_metadata["KeyId"]
rn = __salt__["boto_kms.create_alias"](
alias, kms_key_id, region, key, keyid, profile
)
if "error" in rn:
# We can't recover from this. KMS only exposes enable/disable
# and disable is not necessarily a great action here. AWS sucks
# for not including alias in the create_key call.
ret["result"] = False
ret["comment"] = (
"Failed to create key alias for key_id {}. This resource "
"will be left dangling. Please clean manually. "
"Error: {}".format(kms_key_id, rn["error"]["message"])
)
return ret
ret["changes"]["old"] = {"key": None}
ret["changes"]["new"] = {"key": name}
ret["comment"] = f"Key {name} created."
else:
rd = __salt__["boto_kms.describe_key"](alias, region, key, keyid, profile)
if "error" in rd:
ret["result"] = False
ret["comment"] = "Failed to update key: {}.".format(rd["error"]["message"])
return ret
key_metadata = rd["key_metadata"]
_ret = _key_description(key_metadata, description, region, key, keyid, profile)
ret["changes"] = dictupdate.update(ret["changes"], _ret["changes"])
ret["comment"] = " ".join([ret["comment"], _ret["comment"]])
if not _ret["result"]:
ret["result"] = _ret["result"]
if ret["result"] is False:
return ret
_ret = _key_policy(key_metadata, policy, region, key, keyid, profile)
ret["changes"] = dictupdate.update(ret["changes"], _ret["changes"])
ret["comment"] = " ".join([ret["comment"], _ret["comment"]])
if not _ret["result"]:
ret["result"] = _ret["result"]
if ret["result"] is False:
return ret
# Actions that need to occur whether creating or updating
_ret = _key_enabled(key_metadata, enabled, region, key, keyid, profile)
ret["changes"] = dictupdate.update(ret["changes"], _ret["changes"])
ret["comment"] = " ".join([ret["comment"], _ret["comment"]])
if not _ret["result"]:
ret["result"] = _ret["result"]
if ret["result"] is False:
return ret
_ret = _key_rotation(key_metadata, key_rotation, region, key, keyid, profile)
ret["changes"] = dictupdate.update(ret["changes"], _ret["changes"])
ret["comment"] = " ".join([ret["comment"], _ret["comment"]])
if not _ret["result"]:
ret["result"] = _ret["result"]
return ret
def _key_enabled(key_metadata, enabled, region, key, keyid, profile):
ret = {"result": True, "comment": "", "changes": {}}
kms_key_id = key_metadata["KeyId"]
if key_metadata["Enabled"] == enabled:
return ret
if __opts__["test"]:
ret["comment"] = "Key set to have enabled status updated."
ret["result"] = None
return ret
if enabled:
re = __salt__["boto_kms.enable_key"](kms_key_id, region, key, keyid, profile)
event = "Enabled"
else:
re = __salt__["boto_kms.disable_key"](kms_key_id, region, key, keyid, profile)
event = "Disabled"
if "error" in re:
ret["result"] = False
ret["comment"] = "Failed to update key enabled status: {}.".format(
re["error"]["message"]
)
else:
ret["comment"] = f"{event} key."
return ret
def _key_description(key_metadata, description, region, key, keyid, profile):
ret = {"result": True, "comment": "", "changes": {}}
if key_metadata["Description"] == description:
return ret
if __opts__["test"]:
ret["comment"] = "Key set to have description updated."
ret["result"] = None
return ret
rdu = __salt__["boto_kms.update_key_description"](
key_metadata["KeyId"], description, region, key, keyid, profile
)
if "error" in rdu:
ret["result"] = False
ret["comment"] = "Failed to update key description: {}.".format(
rdu["error"]["message"]
)
else:
ret["comment"] = "Updated key description."
return ret
def _key_rotation(key_metadata, key_rotation, region, key, keyid, profile):
ret = {"result": True, "comment": "", "changes": {}}
kms_key_id = key_metadata["KeyId"]
rke = __salt__["boto_kms.get_key_rotation_status"](
kms_key_id, region, key, keyid, profile
)
if rke["result"] == key_rotation:
return ret
if __opts__["test"]:
ret["comment"] = "Key set to have key rotation policy updated."
ret["result"] = None
return ret
if not key_metadata["Enabled"]:
ret["comment"] = "Key is disabled, not changing key rotation policy."
ret["result"] = None
return ret
if key_rotation:
rk = __salt__["boto_kms.enable_key_rotation"](
kms_key_id, region, key, keyid, profile
)
else:
rk = __salt__["boto_kms.enable_key_rotation"](
kms_key_id, region, key, keyid, profile
)
if "error" in rk:
# Just checking for the key being disabled isn't enough, since key
# disabling is very eventually consistent, so we have a long race
# condition to handle. We check the error message to see if the failure
# was due to a key being disabled.
if "is disabled" in rk["error"]["message"]:
msg = "Key is disabled, not changing key rotation policy."
ret["result"] = None
ret["comment"] = msg
return ret
ret["result"] = False
ret["comment"] = "Failed to set key rotation: {}.".format(
rk["error"]["message"]
)
else:
ret["changes"] = {
"old": {"key_rotation": not key_rotation},
"new": {"key_rotation": key_rotation},
}
ret["comment"] = f"Set key rotation policy to {key_rotation}."
return ret
def _key_policy(key_metadata, policy, region, key, keyid, profile):
ret = {"result": True, "comment": "", "changes": {}}
kms_key_id = key_metadata["KeyId"]
rkp = __salt__["boto_kms.get_key_policy"](
kms_key_id, "default", region, key, keyid, profile
)
if rkp["key_policy"] == policy:
return ret
if __opts__["test"]:
ret["comment"] = "{} Key set to have key policy updated.".format(ret["comment"])
ret["result"] = None
return ret
rpkp = __salt__["boto_kms.put_key_policy"](
kms_key_id, "default", policy, region, key, keyid, profile
)
if "error" in rpkp:
ret["result"] = False
ret["comment"] = "{} Failed to update key policy: {}".format(
ret["comment"], rpkp["error"]["message"]
)
else:
ret["comment"] = "Updated key policy."
return ret