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SUSE:SLE-12-SP1:GA
salt
better-handling-of-bad-public-keys-from-minions...
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File better-handling-of-bad-public-keys-from-minions-bsc-.patch of Package salt
From 27d02cebeb215f3e93c0db9c52eea271ed7ad4ed Mon Sep 17 00:00:00 2001 From: "Daniel A. Wozniak" <dwozniak@saltstack.com> Date: Mon, 2 Aug 2021 13:50:37 -0700 Subject: [PATCH] Better handling of bad public keys from minions (bsc#1189040) Add changelog for #57733 Fix pre-commit check Add missing test Fix test on older pythons --- changelog/57733.fixed | 1 + salt/crypt.py | 16 ++++++++++++--- salt/exceptions.py | 6 ++++++ salt/key.py | 35 ++++++++++++++++---------------- salt/transport/mixins/auth.py | 2 +- tests/pytests/unit/test_crypt.py | 20 ++++++++++++++++++ 6 files changed, 58 insertions(+), 22 deletions(-) create mode 100644 changelog/57733.fixed create mode 100644 tests/pytests/unit/test_crypt.py diff --git a/changelog/57733.fixed b/changelog/57733.fixed new file mode 100644 index 0000000000..0cd55b19a6 --- /dev/null +++ b/changelog/57733.fixed @@ -0,0 +1 @@ +Better handling of bad RSA public keys from minions diff --git a/salt/crypt.py b/salt/crypt.py index 6d45a0d053..be426c6ab3 100644 --- a/salt/crypt.py +++ b/salt/crypt.py @@ -73,7 +73,11 @@ import salt.utils.user import salt.utils.verify import salt.version from salt.exceptions import ( - AuthenticationError, SaltClientError, SaltReqTimeoutError, MasterExit + AuthenticationError, + InvalidKeyError, + MasterExit, + SaltClientError, + SaltReqTimeoutError, ) log = logging.getLogger(__name__) @@ -210,10 +214,16 @@ def get_rsa_pub_key(path): with salt.utils.files.fopen(path, 'rb') as f: data = f.read().replace(b'RSA ', b'') bio = BIO.MemoryBuffer(data) - key = RSA.load_pub_key_bio(bio) + try: + key = RSA.load_pub_key_bio(bio) + except RSA.RSAError: + raise InvalidKeyError("Encountered bad RSA public key") else: with salt.utils.files.fopen(path) as f: - key = RSA.importKey(f.read()) + try: + key = RSA.importKey(f.read()) + except (ValueError, IndexError, TypeError): + raise InvalidKeyError("Encountered bad RSA public key") return key diff --git a/salt/exceptions.py b/salt/exceptions.py index 58cb8b9204..d570cb8df5 100644 --- a/salt/exceptions.py +++ b/salt/exceptions.py @@ -114,6 +114,12 @@ class AuthenticationError(SaltException): ''' +class InvalidKeyError(SaltException): + """ + Raised when we encounter an invalid RSA key. + """ + + class CommandNotFoundError(SaltException): ''' Used in modules or grains when a required binary is not available diff --git a/salt/key.py b/salt/key.py index 6cc4c33a75..809ccc7bde 100644 --- a/salt/key.py +++ b/salt/key.py @@ -10,6 +10,7 @@ import os import shutil import fnmatch import logging +import sys # Import salt libs import salt.cache @@ -625,30 +626,28 @@ class Key(object): keydirs.append(self.REJ) if include_denied: keydirs.append(self.DEN) + invalid_keys = [] for keydir in keydirs: for key in matches.get(keydir, []): + key_path = os.path.join(self.opts["pki_dir"], keydir, key) + try: + salt.crypt.get_rsa_pub_key(key_path) + except salt.exceptions.InvalidKeyError: + log.error("Invalid RSA public key: %s", key) + invalid_keys.append((keydir, key)) + continue try: shutil.move( - os.path.join( - self.opts['pki_dir'], - keydir, - key), - os.path.join( - self.opts['pki_dir'], - self.ACC, - key) - ) - eload = {'result': True, - 'act': 'accept', - 'id': key} - self.event.fire_event(eload, - salt.utils.event.tagify(prefix='key')) + key_path, os.path.join(self.opts["pki_dir"], self.ACC, key), + ) + eload = {"result": True, "act": "accept", "id": key} + self.event.fire_event(eload, salt.utils.event.tagify(prefix="key")) except (IOError, OSError): pass - return ( - self.name_match(match) if match is not None - else self.dict_match(matches) - ) + for keydir, key in invalid_keys: + matches[keydir].remove(key) + sys.stderr.write("Unable to accept invalid key for {}.\n".format(key)) + return self.name_match(match) if match is not None else self.dict_match(matches) def accept_all(self): ''' diff --git a/salt/transport/mixins/auth.py b/salt/transport/mixins/auth.py index e7a0b96eee..ec736227ab 100644 --- a/salt/transport/mixins/auth.py +++ b/salt/transport/mixins/auth.py @@ -434,7 +434,7 @@ class AESReqServerMixin(object): # and an empty request comes in try: pub = salt.crypt.get_rsa_pub_key(pubfn) - except (ValueError, IndexError, TypeError) as err: + except salt.crypt.InvalidKeyError as err: log.error('Corrupt public key "%s": %s', pubfn, err) return {'enc': 'clear', 'load': {'ret': False}} diff --git a/tests/pytests/unit/test_crypt.py b/tests/pytests/unit/test_crypt.py new file mode 100644 index 0000000000..aa8f439b8c --- /dev/null +++ b/tests/pytests/unit/test_crypt.py @@ -0,0 +1,20 @@ +""" +tests.pytests.unit.test_crypt +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +Unit tests for salt's crypt module +""" +import pytest +import salt.crypt +import salt.utils.files + + +def test_get_rsa_pub_key_bad_key(tmp_path): + """ + get_rsa_pub_key raises InvalidKeyError when encoutering a bad key + """ + key_path = str(tmp_path / "key") + with salt.utils.files.fopen(key_path, "w") as fp: + fp.write("") + with pytest.raises(salt.crypt.InvalidKeyError): + salt.crypt.get_rsa_pub_key(key_path) -- 2.32.0
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