From a8e3defcb484296e18343c6447649fe508ab2644 Mon Sep 17 00:00:00 2001
From: Bo Maryniuk <bo@suse.de>
Date: Sat, 28 Jul 2018 22:59:04 +0200
Subject: [PATCH] Use Adler32 algorithm to compute string checksums

Generate the same numeric value across all Python versions and platforms

Re-add getting hash by Python shell-out method

Add an option to choose between default hashing, Adler32 or CRC32 algorithms

Set default config option  for server_id hashing to False on minion

Choose CRC method, default to faster but less reliable "adler32", if crc is in use

Add warning for Sodium.
---
 salt/config/__init__.py |  7 ++++++-
 salt/grains/core.py     | 53 ++++++++++++++++++++++++++++++++-----------------
 2 files changed, 41 insertions(+), 19 deletions(-)

diff --git a/salt/config/__init__.py b/salt/config/__init__.py
index 70b34ec949..0ebe1181dd 100644
--- a/salt/config/__init__.py
+++ b/salt/config/__init__.py
@@ -1190,6 +1190,10 @@ VALID_OPTS = immutabletypes.freeze({
     # Allow raw_shell option when using the ssh
     # client via the Salt API
     'netapi_allow_raw_shell': bool,
+
+    # Use Adler32 hashing algorithm for server_id (default False until Sodium, "adler32" after)
+    # Possible values are: False, adler32, crc32
+    'server_id_use_crc': (bool, six.string_types),
 })
 
 # default configurations
@@ -1480,7 +1484,8 @@ DEFAULT_MINION_OPTS = immutabletypes.freeze({
     'minion_sign_messages': False,
     'discovery': False,
     'schedule': {},
-    'ssh_merge_pillar': True
+    'ssh_merge_pillar': True,
+    'server_id_use_crc': False,
 })
 
 DEFAULT_MASTER_OPTS = immutabletypes.freeze({
diff --git a/salt/grains/core.py b/salt/grains/core.py
index 2851809472..9c1b5d930e 100644
--- a/salt/grains/core.py
+++ b/salt/grains/core.py
@@ -20,6 +20,7 @@ import platform
 import logging
 import locale
 import uuid
+import zlib
 from errno import EACCES, EPERM
 import datetime
 import warnings
@@ -62,6 +63,7 @@ import salt.utils.path
 import salt.utils.pkg.rpm
 import salt.utils.platform
 import salt.utils.stringutils
+import salt.utils.versions
 from salt.ext import six
 from salt.ext.six.moves import range
 
@@ -2792,40 +2794,55 @@ def _hw_data(osdata):
     return grains
 
 
-def get_server_id():
+def _get_hash_by_shell():
     '''
-    Provides an integer based on the FQDN of a machine.
-    Useful as server-id in MySQL replication or anywhere else you'll need an ID
-    like this.
+    Shell-out Python 3 for compute reliable hash
+    :return:
     '''
-    # Provides:
-    #   server_id
-
-    if salt.utils.platform.is_proxy():
-        return {}
     id_ = __opts__.get('id', '')
     id_hash = None
     py_ver = sys.version_info[:2]
     if py_ver >= (3, 3):
         # Python 3.3 enabled hash randomization, so we need to shell out to get
         # a reliable hash.
-        id_hash = __salt__['cmd.run'](
-            [sys.executable, '-c', 'print(hash("{0}"))'.format(id_)],
-            env={'PYTHONHASHSEED': '0'}
-        )
+        id_hash = __salt__['cmd.run']([sys.executable, '-c', 'print(hash("{0}"))'.format(id_)],
+                                      env={'PYTHONHASHSEED': '0'})
         try:
             id_hash = int(id_hash)
         except (TypeError, ValueError):
-            log.debug(
-                'Failed to hash the ID to get the server_id grain. Result of '
-                'hash command: %s', id_hash
-            )
+            log.debug('Failed to hash the ID to get the server_id grain. Result of hash command: %s', id_hash)
             id_hash = None
     if id_hash is None:
         # Python < 3.3 or error encountered above
         id_hash = hash(id_)
 
-    return {'server_id': abs(id_hash % (2 ** 31))}
+    return abs(id_hash % (2 ** 31))
+
+
+def get_server_id():
+    '''
+    Provides an integer based on the FQDN of a machine.
+    Useful as server-id in MySQL replication or anywhere else you'll need an ID
+    like this.
+    '''
+    # Provides:
+    #   server_id
+
+    if salt.utils.platform.is_proxy():
+        server_id = {}
+    else:
+        use_crc = __opts__.get('server_id_use_crc')
+        if bool(use_crc):
+            id_hash = getattr(zlib, use_crc, zlib.adler32)(__opts__.get('id', '').encode()) & 0xffffffff
+        else:
+            salt.utils.versions.warn_until('Sodium', 'This server_id is computed nor by Adler32 neither by CRC32. '
+                                                     'Please use "server_id_use_crc" option and define algorithm you'
+                                                     'prefer (default "Adler32"). The server_id will be computed with'
+                                                     'Adler32 by default.')
+            id_hash = _get_hash_by_shell()
+        server_id = {'server_id': id_hash}
+
+    return server_id
 
 
 def get_master():
-- 
2.16.4