Addresses #6579 Disallow vault passwords with newline characters by stripping them in utils

bin/ansible-vault

@@ -105,6 +105,7 @@ def _read_password(filename):
     f = open(filename, "rb")
     data = f.read()
     f.close
+    data = data.strip()
     return data
 
 def execute_create(args, options, parser):

lib/ansible/utils/__init__.py

@@ -810,6 +810,10 @@ def ask_vault_passwords(ask_vault_pass=False, ask_new_vault_pass=False, confirm_
         if new_vault_pass != new_vault_pass2:
             raise errors.AnsibleError("Passwords do not match")
 
+    # enforce no newline chars at the end of passwords
+    vault_pass = vault_pass.strip()
+    new_vault_pass = new_vault_pass.strip()
+
     return vault_pass, new_vault_pass
 
 def ask_passwords(ask_pass=False, ask_sudo_pass=False, ask_su_pass=False, ask_vault_pass=False):