cloud-setup-databases: shell-escape values passed to EncryptionCLI

processEncryptionStuff()'s encrypt() built the java EncryptionCLI
command by hand-wrapping each dynamic value in literal double quotes,
then handed the joined string to runCmd(), which runs it through
`subprocess.Popen(..., shell=True)`. Double quotes do not stop the
shell from expanding "$..." inside them, so a password like
`pa$sword` is silently truncated to `pa` before it ever reaches
EncryptionCLI, and the wrong value gets encrypted into db.properties.

Use shlex.quote() instead of manual double-quote wrapping for the jar
path, the value being encrypted, and the management server secret
key. shlex.quote() produces shell-safe quoting for arbitrary values,
including but not limited to '$'.

Verified with a standalone reproduction that shells out the same way
runCmd() does: with the old double-quote wrapping, a password of
`pa$sword` arrives at the child process as `pa`; with shlex.quote(),
it arrives intact as `pa$sword`.

Fixes: #14186
Signed-off-by: SiddharthSanch <111047247+SiddharthSanch@users.noreply.github.com>

Author: SiddharthSanch

setup/bindir/cloud-setup-databases.in

@@ -21,6 +21,7 @@ import os
 import sys
 import subprocess
 import glob
+import shlex
 from random import choice
 import string
 from optparse import OptionParser
@@ -418,8 +419,13 @@ for example:
 
     def processEncryptionStuff(self):
         def encrypt(value):
-            cmd = ['java','-classpath','"' + self.encryptionJarPath + '"','com.cloud.utils.crypt.EncryptionCLI','-i','"' + value + '"', '-p', '"' +
-                   self.mgmtsecretkey + '"', self.encryptorVersion]
+            # runCmd() joins this list with spaces and runs it through a shell, so each
+            # dynamic value must be shell-escaped with shlex.quote() rather than hand-wrapped
+            # in double quotes: double quotes still let the shell expand "$..." in the value
+            # (e.g. a password of pa$sword is truncated to pa), silently corrupting it.
+            cmd = ['java', '-classpath', shlex.quote(self.encryptionJarPath),
+                   'com.cloud.utils.crypt.EncryptionCLI', '-i', shlex.quote(value),
+                   '-p', shlex.quote(self.mgmtsecretkey), self.encryptorVersion]
             return str(runCmd(cmd)).strip('\r\n')
 
         def saveMgmtServerSecretKey():