Actually we allow currently strange things, this fixes it on the usernames

private/Backup.py

@@ -49,9 +49,11 @@ class Backup:
     @staticmethod
     def ImportFromFile(fname: str = CFG.args.file, db: str = CFG.REG_FILE, userids: tuple = tuple([])):
         if not os.path.isfile(fname):
-            return None  # @TODO maybe some better output here
+            print(f"File {fname} don't exist")
+            return None
         if not os.path.isfile(db):
-            return None  # @TODO maybe some better output here
+            print(f"The database file {db} don't exist")
+            return None
         if userids:
             pass  # empty tuple means everything
         # noinspection PyBroadException
@@ -64,31 +66,40 @@ class Backup:
                 reader = csv.DictReader(f)  # @TODO csv.Sniffer to compare? When yes, give force-accept option
                 for row in reader:
                     # if any of this fails move on to the next user, just print a relatively helpful message lel
-                    if not lib.validator.checkUsernameLength(row["username"]):
-                        print(f"The username {row['username']} is either too long(>16) or short(<3).")
-                        continue
                     if not lib.validator.checkUsernameCharacters(row["username"]):
                         print(f"The username contains unsupported characters or starts with a number: "
                               f"{row['username']}")
                         continue
+                    if not lib.validator.checkUsernameLength(row["username"]):
+                        print(f"The username {row['username']} is either too long(>16) or short(<3).")
+                        continue
                     if not lib.validator.checkSSHKey(row["pubkey"]):
                         print(f"Following SSH-Key isn't valid: {row['pubkey']}")
                         continue
-                    if lib.validator.checkUserExists(row["username"]):
-                        print(f"The user '{row['username']}' already exists.")
-                        continue
                     if not lib.validator.checkEmail(row["email"]):
                         print(f"The E-Mail address {row['email']} is not valid.")
                         continue
+                    if lib.validator.checkUserExists(row["username"]):
+                        print(f"The user '{row['username']}' already exists.")
+                        continue
                     if row["status"] == "1":
                         try:
-                            sysctl.register(row["username"])  # @TODO exception lib.UserExceptions.UserExistsAlready
+                            sysctl.register(row["username"])
-                            sysctl.lock_user_pw(row["username"])  # @TODO exception lib.UserExceptions.UnknownReturnCode
+                            sysctl.lock_user_pw(row["username"])
-                            sysctl.add_to_usergroup(row["username"])  # @TODO exception lib.UnknownReturnCode
+                            sysctl.add_to_usergroup(row["username"])
-                            sysctl.make_ssh_usable(row["username"], row["pubkey"])  # @TODO exception
+                            sysctl.make_ssh_usable(row["username"], row["pubkey"])
                             print(row['username'], "====> Registered.")
-                        except Exception as e:
+                        except lib.UserExceptions.UserExistsAlready as UEA:
-                            print(e)
+                            pass  # @TODO User was determined to exists already, shouldn't happen but is possible
+                        except lib.UserExceptions.UnknownReturnCode as URC:
+                            pass  # @TODO Unknown Return Codes. Can happen in various function
+                        except lib.UserExceptions.SSHDirUncreatable as SDU:
+                            pass  # @TODO SSH Directory doesn't exist AND couldn't be created. Inherently wrong design!
+                        except lib.UserExceptions.ModifyFilesystem as MFS:
+                            pass  # @TODO Same as SSH Dir but more general, same problem: Wrong Permissions,
+                            # Missing Dirs etc
+                        except Exception as E:  # @TODO well less broad is hard to achieve Kappa
+                            print(E)
                             continue
                     elif row["status"] == "0":
                         print(row['username'] + " not approved, therefore not registered.")
@@ -100,8 +111,8 @@ class Backup:
                     except OSError as E:
                         pass
                         print(f"UUFFF, something went WRONG with the file {fname}: {E}")
-        except Exception as e:
+        except Exception as didntCatch:
-            print(f"Exception! UNCATCHED! {type(e)}")
+            print(f"Exception! UNCATCHED! {type(didntCatch)}")
         return True
 
 

private/lib/validator.py

@@ -3,9 +3,11 @@ import pwd
 
 
 def checkUsernameCharacters(username: str):
-    if re.match("[a-z]+[a-z0-9]", username):
+    if " " not in username and "_" not in username and username.isascii() and username.islower() and \
+            not username[0].isnumeric():
+        if not re.search(r"\W+", username):
+            if not re.search("[^a-z0-9]", username):
                 return True
-    else:
     return False
 
 
@@ -21,9 +23,9 @@ def checkUserExists(username: str):
     try:
         pwd.getpwnam(username)
     except KeyError:
-        return True  # User already exists
+        return False  # User already exists
     else:
-        return False  # User doesnt exist
+        return True  # User doesnt exist
 
 
 def checkSSHKey(key: str):

public/userapplication.py

@@ -77,6 +77,12 @@ def __checkSQLite(cursor, connection):
 
 def check_username(value):
     global VALID_USER
+    if " " in value or "_ " in value or not value.isascii() or not value.islower() or value[0].isnumeric():
+        VALID_USER = False
+        return False
+    if re.search(r"\W+", value):
+        VALID_USER = False
+        return False
     if len(value) < 3:
         VALID_USER = False
         return False