diff --git a/src/middlewared/middlewared/api/base/types/user.py b/src/middlewared/middlewared/api/base/types/user.py
index afa9d5cd3f453..eda72977f1a9e 100644
--- a/src/middlewared/middlewared/api/base/types/user.py
+++ b/src/middlewared/middlewared/api/base/types/user.py
@@ -4,26 +4,47 @@
 from pydantic.functional_validators import AfterValidator
 from typing_extensions import Annotated
 
-__all__ = ["LocalUsername", "LocalUID"]
+__all__ = ["LocalUsername", "RemoteUsername", "LocalUID"]
 
 TRUENAS_IDMAP_DEFAULT_LOW = 90000001
 
+DEFAULT_VALID_CHARS = string.ascii_letters + string.digits + '_' + '-' + '$' + '.'
+DEFAULT_VALID_START = string.ascii_letters + '_'
+DEFAULT_MAX_LENGTH = 32
 
-def validate_local_username(val):
-    # see man 8 useradd, specifically the CAVEATS section
-    # NOTE: we are ignoring the man page's recommendation for insistence
-    # upon the starting character of a username be a lower-case letter.
-    # We aren't enforcing this for maximum backwards compatibility
+
+def validate_username(
+    val: str,
+    valid_chars: str = DEFAULT_VALID_CHARS,
+    valid_start_chars : str | None = DEFAULT_VALID_START,
+    max_length: int | None = DEFAULT_MAX_LENGTH
+) -> str:
     val_len = len(val)
-    valid_chars = string.ascii_letters + string.digits + '_' + '-' + '$' + '.'
-    valid_start = string.ascii_letters + '_'
     assert val_len > 0, 'Username must be at least 1 character in length'
-    assert val_len <= 32, 'Username cannot exceed 32 characters in length'
-    assert val[0] in valid_start, 'Username must start with a letter or an underscore'
+    if max_length is not None:
+        assert val_len <= max_length, f'Username cannot exceed {max_length} charaters in length'
+    if valid_start_chars is not None:
+        assert val[0] in valid_start_chars, 'Username must start with a letter or an underscore'
+
     assert '$' not in val or val[-1] == '$', 'Username must end with a dollar sign character'
     assert all(char in valid_chars for char in val), f'Valid characters for a username are: {", ".join(valid_chars)!r}'
     return val
 
 
+def validate_local_username(val: str) -> str:
+    # see man 8 useradd, specifically the CAVEATS section
+    # NOTE: we are ignoring the man page's recommendation for insistence
+    # upon the starting character of a username be a lower-case letter.
+    # We aren't enforcing this for maximum backwards compatibility
+    return validate_username(val)
+
+
+def validate_remote_username(val: str) -> str:
+    # Restrictions on names returned by nss_winbind are more lax than we place
+    # on our local usernames. \\ is used as a separator for domain and username
+    return validate_username(val, DEFAULT_VALID_CHARS + '\\', None, None)
+
+
 LocalUsername = Annotated[str, AfterValidator(validate_local_username)]
+RemoteUsername = Annotated[str, AfterValidator(validate_remote_username)]
 LocalUID = Annotated[int, Ge(0), Le(TRUENAS_IDMAP_DEFAULT_LOW - 1)]
diff --git a/src/middlewared/middlewared/api/v25_04_0/user.py b/src/middlewared/middlewared/api/v25_04_0/user.py
index b45168c617d6d..2da4fb7aff5bb 100644
--- a/src/middlewared/middlewared/api/v25_04_0/user.py
+++ b/src/middlewared/middlewared/api/v25_04_0/user.py
@@ -2,8 +2,8 @@
 from pydantic import EmailStr
 from typing_extensions import Annotated
 
-from middlewared.api.base import (BaseModel, Excluded, excluded_field, ForUpdateMetaclass, LocalUsername, LocalUID,
-                                  LongString, NonEmptyString, Private, single_argument_result)
+from middlewared.api.base import (BaseModel, Excluded, excluded_field, ForUpdateMetaclass, LocalUsername, RemoteUsername,
+                                  LocalUID, LongString, NonEmptyString, Private, single_argument_result)
 
 __all__ = ["UserEntry", "UserCreateArgs", "UserCreateResult", "UserUpdateArgs", "UserUpdateResult",
            "UserRenew2faSecretArgs", "UserRenew2faSecretResult"]
@@ -15,9 +15,9 @@
 class UserEntry(BaseModel):
     id: int
     uid: int
-    username: LocalUsername
-    unixhash: Private[str]
-    smbhash: Private[str]
+    username: LocalUsername | RemoteUsername
+    unixhash: Private[str | None]
+    smbhash: Private[str | None]
     home: NonEmptyString = DEFAULT_HOME_PATH
     shell: NonEmptyString = "/usr/bin/zsh"
     "Available choices can be retrieved with `user.shell_choices`."
diff --git a/src/middlewared/middlewared/plugins/directoryservices_/util_cache.py b/src/middlewared/middlewared/plugins/directoryservices_/util_cache.py
index 6bcbeea5050f4..b5f7d34f62910 100644
--- a/src/middlewared/middlewared/plugins/directoryservices_/util_cache.py
+++ b/src/middlewared/middlewared/plugins/directoryservices_/util_cache.py
@@ -253,16 +253,15 @@ def fill_cache(
                     'shell': user_data.pw_shell,
                     'full_name': user_data.pw_gecos,
                     'builtin': False,
-                    'email': '',
+                    'email': None,
                     'password_disabled': False,
                     'locked': False,
                     'sudo_commands': [],
-                    'sudo_commands_nopasswd': False,
-                    'attributes': {},
+                    'sudo_commands_nopasswd': [],
                     'groups': [],
                     'sshpubkey': None,
                     'immutable': True,
-                    'two_factor_auth_configured': False,
+                    'twofactor_auth_configured': False,
                     'local': False,
                     'id_type_both': id_type_both,
                     'nt_name': user_data.pw_name,
diff --git a/src/middlewared/middlewared/plugins/idmap.py b/src/middlewared/middlewared/plugins/idmap.py
index 1c78ccfa3c3af..03f5e985132d3 100644
--- a/src/middlewared/middlewared/plugins/idmap.py
+++ b/src/middlewared/middlewared/plugins/idmap.py
@@ -1174,11 +1174,11 @@ async def synthetic_user(self, passwd, sid):
             'unixhash': None,
             'smbhash': None,
             'group': {},
-            'home': '',
-            'shell': '',
+            'home': passwd['pw_dir'],
+            'shell': passwd['pw_shell'],
             'full_name': passwd['pw_gecos'],
             'builtin': False,
-            'email': '',
+            'email': None,
             'password_disabled': False,
             'locked': False,
             'sudo_commands': [],