generate random passwords using minclass

cloudinit/config/cc_set_passwords.py

@@ -248,4 +248,4 @@ def handle(name: str, cfg: Config, cloud: Cloud, args: list) -> None:
 
 
 def rand_user_password(pwlen=20):
-    return util.rand_str(pwlen, select_from=PW_SET)
+    return util.rand_str_minclass(pwlen, select_from=PW_SET, minclass=3)

cloudinit/util.py

@@ -299,6 +299,36 @@ def rand_str(strlen=32, select_from=None):
     return "".join([r.choice(select_from) for _x in range(strlen)])
 
 
+def rand_str_minclass(strlen=32, select_from=None, minclass=3):
+    res_rand_list = [
+        random.choice(string.digits),
+        random.choice(string.ascii_lowercase),
+        random.choice(string.ascii_uppercase),
+    ]
+    if minclass > 3:
+        res_rand_list.append(random.choice(string.punctuation))
+        if select_from:
+            select_from += string.punctuation
+
+    res_rand_list = random.sample(res_rand_list, minclass)
+    res_rand_list.extend(list(rand_str(strlen-minclass, select_from)))
+    random.shuffle(res_rand_list)
+    return "".join(res_rand_list)
+
+
+def get_str_class_num(str):
+    str_class_num = 0
+    if any(c.islower() for c in str):
+        str_class_num += 1
+    if any(c.isupper() for c in str):
+        str_class_num += 1
+    if any(c.isdigit() for c in str):
+        str_class_num += 1
+    if any(c in string.punctuation for c in str):
+        str_class_num += 1
+    return str_class_num
+
+
 def rand_dict_key(dictionary, postfix=None):
     if not postfix:
         postfix = ""