Comment créer WindowsIdentity / WindowsPrincipal à partir du nom d'utilisateur au DOMAINE \ format utilisateur
Le constructeur WindowsIdentity(string) requiert que le nom d'utilisateur soit dans [email protected] format. Mais dans mon cas, je reçois les noms d'utilisateur d'une base de données dans l'ancien DOMAIN\user format (et ensuite vérifier leur appartenance au rôle Windows).
Quelle est la meilleure façon de créer WindowsPrincipal à partir de l'ancien nom d'utilisateur (sAMAccountName)?
Il semble qu'il n'y ait aucun moyen de convertir le format du nom d'utilisateur sans impliquer une requête dans Active Directory. Comme c'est le cas, il n'est pas nécessaire de créer WindowsPrincipal pour vérifier l'appartenance au groupe car cela nécessiterait probablement une autre connexion à AD.
En utilisant le System.DirectoryServices.AccountManagement espace de noms, vous pouvez à la fois obtenir l'UPN de l'utilisateur et vérifier l'appartenance au groupe.
string accountName = @"DOMAIN\user";
var groupNames = new[] { "DOMAIN\Domain Users", "DOMAIN\Group2" }; // the groups that we need to verify if the user is member of
// cannot create WindowsIdentity because it requires username in form [email protected] but the passed value will be DOMAIN\user.
using (var pc = new PrincipalContext(System.DirectoryServices.AccountManagement.ContextType.Domain, Environment.UserDomainName))
{
using (var p = UserPrincipal.FindByIdentity(pc, accountName))
{
// if the account does not exist or is not an user account
if (p == null)
return new string[0];
// if you need just the UPN of the user, you can use this
////return p.UserPrincipalName;
// find all groups the user is member of (the check is recursive).
// Guid != null check is intended to remove all built-in objects that are not really AD gorups.
// the Sid.Translate method gets the DOMAIN\Group name format.
var userIsMemberOf = p.GetAuthorizationGroups().Where(o => o.Guid != null).Select(o => o.Sid.Translate(typeof(NTAccount)).ToString());
// use a HashSet to find the group the user is member of.
var groups = new HashSet<string>(userIsMemberOf, StringComparer.OrdinalIgnoreCase);
groups.IntersectWith(groupNames);
return groups;
}
}
Cela fonctionne bien mais implique une requête vers le magasin Active Directory/SAM (selon le contexte) ...
private WindowsIdentity GetWindowsIdentity(
string userName)
{
using (var user =
UserPrincipal.FindByIdentity(
UserPrincipal.Current.Context,
IdentityType.SamAccountName,
userName
) ??
UserPrincipal.FindByIdentity(
UserPrincipal.Current.Context,
IdentityType.UserPrincipalName,
userName
))
{
return user == null
? null
: new WindowsIdentity(user.UserPrincipalName);
}
}
J'ai pris le DsCrackNames sur l'exemple pinvoke.net et l'ai modifié pour convertir le nom nt4 en UPN. C'est un peu bâclé et vous voudrez peut-être nettoyer. Pour cela, il doit frapper le DS aussi. Ils ont le drapeau DS_NAME_FLAG_SYNTACTICAL_ONLY qui peut être utilisé pour ne pas frapper le répertoire mais je ne pense pas que cela fonctionnera ici.
class Entry
{
const uint NO_ERROR = 0;
[DllImport("ntdsapi.dll", CharSet = CharSet.Auto)]
static public extern uint DsCrackNames(
IntPtr hDS,
DS_NAME_FLAGS flags,
DS_NAME_FORMAT formatOffered,
DS_NAME_FORMAT formatDesired,
uint cNames,
string[] rpNames,
out IntPtr ppResult // PDS_NAME_RESULT
);
[DllImport("ntdsapi.dll", CharSet = CharSet.Auto)]
static public extern void DsFreeNameResult(IntPtr pResult /* DS_NAME_RESULT* */);
public enum DS_NAME_ERROR
{
DS_NAME_NO_ERROR = 0,
// Generic processing error.
DS_NAME_ERROR_RESOLVING = 1,
// Couldn't find the name at all - or perhaps caller doesn't have
// rights to see it.
DS_NAME_ERROR_NOT_FOUND = 2,
// Input name mapped to more than one output name.
DS_NAME_ERROR_NOT_UNIQUE = 3,
// Input name found, but not the associated output format.
// Can happen if object doesn't have all the required attributes.
DS_NAME_ERROR_NO_MAPPING = 4,
// Unable to resolve entire name, but was able to determine which
// domain object resides in. Thus DS_NAME_RESULT_ITEM?.pDomain
// is valid on return.
DS_NAME_ERROR_DOMAIN_ONLY = 5,
// Unable to perform a purely syntactical mapping at the client
// without going out on the wire.
DS_NAME_ERROR_NO_SYNTACTICAL_MAPPING = 6,
// The name is from an external trusted forest.
DS_NAME_ERROR_TRUST_REFERRAL = 7
}
[Flags]
public enum DS_NAME_FLAGS
{
DS_NAME_NO_FLAGS = 0x0,
// Perform a syntactical mapping at the client (if possible) without
// going out on the wire. Returns DS_NAME_ERROR_NO_SYNTACTICAL_MAPPING
// if a purely syntactical mapping is not possible.
DS_NAME_FLAG_SYNTACTICAL_ONLY = 0x1,
// Force a trip to the DC for evaluation, even if this could be
// locally cracked syntactically.
DS_NAME_FLAG_EVAL_AT_DC = 0x2,
// The call fails if the DC is not a GC
DS_NAME_FLAG_GCVERIFY = 0x4,
// Enable cross forest trust referral
DS_NAME_FLAG_TRUST_REFERRAL = 0x8
}
public enum DS_NAME_FORMAT
{
// unknown name type
DS_UNKNOWN_NAME = 0,
// eg: CN=User Name,OU=Users,DC=Example,DC=Microsoft,DC=Com
DS_FQDN_1779_NAME = 1,
// eg: Example\UserN
// Domain-only version includes trailing '\\'.
DS_NT4_ACCOUNT_NAME = 2,
// Probably "User Name" but could be something else. I.e. The
// display name is not necessarily the defining RDN.
DS_DISPLAY_NAME = 3,
// obsolete - see #define later
// DS_DOMAIN_SIMPLE_NAME = 4,
// obsolete - see #define later
// DS_ENTERPRISE_SIMPLE_NAME = 5,
// String-ized GUID as returned by IIDFromString().
// eg: {4fa050f0-f561-11cf-bdd9-00aa003a77b6}
DS_UNIQUE_ID_NAME = 6,
// eg: example.Microsoft.com/software/user name
// Domain-only version includes trailing '/'.
DS_CANONICAL_NAME = 7,
// eg: [email protected]
DS_USER_PRINCIPAL_NAME = 8,
// Same as DS_CANONICAL_NAME except that rightmost '/' is
// replaced with '\n' - even in domain-only case.
// eg: example.Microsoft.com/software\nuser name
DS_CANONICAL_NAME_EX = 9,
// eg: www/[email protected] - generalized service principal
// names.
DS_SERVICE_PRINCIPAL_NAME = 10,
// This is the string representation of a SID. Invalid for formatDesired.
// See sddl.h for SID binary <--> text conversion routines.
// eg: S-1-5-21-397955417-626881126-188441444-501
DS_SID_OR_SID_HISTORY_NAME = 11,
// Pseudo-name format so GetUserNameEx can return the DNS domain name to
// a caller. This level is not supported by the DS APIs.
DS_DNS_DOMAIN_NAME = 12
}
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
public struct DS_NAME_RESULT_ITEM
{
public DS_NAME_ERROR status;
public string pDomain;
public string pName;
}
[DllImport("ntdsapi.dll", CharSet = CharSet.Auto)]
static public extern uint DsBind(
string DomainControllerName, // in, optional
string DnsDomainName, // in, optional
out IntPtr phDS);
[DllImport("ntdsapi.dll", CharSet = CharSet.Auto)]
static public extern uint DsUnBind(ref IntPtr phDS);
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
public struct DS_NAME_RESULT
{
public uint cItems;
public IntPtr rItems; // PDS_NAME_RESULT_ITEM
}
[STAThread]
static void Main(string[] args)
{
// Bind to default global catalog
IntPtr hDS;
uint err = DsBind(null, null, out hDS);
if (err != NO_ERROR)
{
Console.WriteLine("Error on DsBind : {0}", err);
return;
}
// Crack the currently logged on name
try
{
string[] names = new string[] { System.Security.Principal.WindowsIdentity.GetCurrent().Name };
DS_NAME_RESULT_ITEM[] results =
HandleDsCrackNames(hDS, DS_NAME_FLAGS.DS_NAME_NO_FLAGS, DS_NAME_FORMAT.DS_NT4_ACCOUNT_NAME, DS_NAME_FORMAT.DS_USER_PRINCIPAL_NAME, names);
foreach (DS_NAME_RESULT_ITEM result in results)
{
Console.WriteLine("Result : {0}\r\nDomain : {1}\r\nName : {2}", result.status, result.pDomain, result.pName);
}
}
finally
{
DsUnBind(ref hDS);
}
}
/// <summary>
/// A wrapper function for the DsCrackNames OS call
/// </summary>
/// <param name="hDS">DsBind handle</param>
/// <param name="flags">Flags controlling the process</param>
/// <param name="formatOffered">Format of the names</param>
/// <param name="formatDesired">Desired format for the names</param>
/// <param name="names">The names to crack</param>
/// <returns>The crack result</returns>
public static DS_NAME_RESULT_ITEM[] HandleDsCrackNames(IntPtr hDS, DS_NAME_FLAGS flags, DS_NAME_FORMAT formatOffered, DS_NAME_FORMAT formatDesired, string[] names)
{
IntPtr pResult;
DS_NAME_RESULT_ITEM[] ResultArray;
uint err = DsCrackNames(
hDS,
flags,
formatOffered,
formatDesired,
(uint)((names == null) ? 0 : names.Length),
names,
out pResult);
if (err != NO_ERROR)
throw new System.ComponentModel.Win32Exception((int)err);
try
{
// Next convert the returned structure to managed environment
DS_NAME_RESULT Result = new DS_NAME_RESULT();
Result.cItems = (uint)Marshal.ReadInt32(pResult);
Result.rItems = Marshal.ReadIntPtr(pResult, Marshal.OffsetOf(typeof(DS_NAME_RESULT), "rItems").ToInt32());
IntPtr curptr = Result.rItems;
ResultArray = new DS_NAME_RESULT_ITEM[Result.cItems];
for (int index = 0; index < (int)Result.cItems; index++)
{
ResultArray[index] = (DS_NAME_RESULT_ITEM)Marshal.PtrToStructure(curptr, typeof(DS_NAME_RESULT_ITEM));
curptr = (IntPtr)((int)curptr + Marshal.SizeOf(ResultArray[index]));
}
}
finally
{
DsFreeNameResult(pResult);
}
return ResultArray;
}
}