Active Directory Authentication in ASP.NET MVC 5 with Forms Authentication and Group Based Authorization Ben Rameys Blog.Oct 2. 01. 4I know that blog post title is sure a mouth full, but it describes the whole problem I was trying to solve in a recent project.The Project. Let me outline the project briefly.We were building a report dashboard type site that will live inside the clients network.The dashboard gives an overview of various, very important information that relates to how the company is performing on a hourly basis.So, the dashboard is only available to a certain group of directors.To limit the solution to the these directors, authentication and authorization would go through their existing Active Directory setup by putting the authorized users in a special AD group.The Problem. Getting authentication to work was a snap.Microsoft provides the System.Web. Security. Active.GoogleAppsDirecSync_12_1.jpg' alt='Active Directory Attribute Length Limit' title='Active Directory Attribute Length Limit' />Directory.Membership. Provider.Putting an Authorize attribute on my action methods or entire controllers was all I needed to get it working besides, of course, the system.Heres my relevant web.Strings lt addnameADConnection.Stringconnection.Stringlt ldap connection string here lt connection.Strings. lt authenticationmodeForms lt formsname.Auth. Cookielogin.Urllogin lt authentication lt membershipdefault.ProviderADMembership.Provider lt providers lt clear lt addnameADMembership.ProvidertypeSystem.Web. Security. Active.Directory. Membership.Providerconnection.String. NameADConnection.Stringattribute. Map.Usernames. AMAccount.Name lt providers lt membership The tough part came when I wanted to limit access to users in that AD group.Microsoft doesnt provide a Role.Provider along with its Active.Directory. Membership.Provider. So, what to do I tried several methods I found online.Most of them were based on creating my own custom Role.E29277_01/doc.701/e28482/img/filtlib.gif' alt='Active Directory Attribute Length Limit' title='Active Directory Attribute Length Limit' />Provider and querying AD to iterate through the users groups treating them like roles and seeing if one of them matched my AD group I was looking for.However, I could never get it to work.Each code example I found eventually gave me this AD error when I iterated through the current users AD groups The specified directory service attribute or value does not exist.The Solution. Eventually, I found a solution online that worked.Instead of setting up a custom Role.Provider, all it involved was creating a custom Authorize.Attribute for your MVC controllers or action methods that checked the users.Is. Member. Of method to see if the member belonged the sought after group or groups.I dont know why this method does not cause the same AD error as describe above, but Im glad it doesnt All I can assume is that it queries AD in a more friendly way.Here is my custom Authorize.Attribute publicclass.Authorize. ADAttribute Authorize.Attributeprivateboolauthenticated privateboolauthorized publicstring.Groupsget set protectedoverridevoid.Handle. Unauthorized.RequestAuthorization.Contextfilter. Contextbase.Handle. Unauthorized.Requestfilter. Context ifauthenticated authorizedfilter.Context. Resultnew.NTFS New Technology File System is a proprietary file system developed by Microsoft.Starting with Windows NT 3.Windows NT family.Redirect. Resulterrornotauthorized protectedoverridebool.Authorize. CoreHttp.Context. Basehttp.Contextauthenticatedbase.Authorize. Corehttp.Context ifauthenticatedifstring.How would I know what the maximum length of an elements attribute value is e.Whats the maximum allowable length for ID.Organizational unit FIM Objects Organizational unit that is used as a target for the provisioned group.User accounts ADMA Active Directory user account with.Active Directory Attribute Length Limit' title='Active Directory Attribute Length Limit' />Is.Null. Or. EmptyGroupsauthorizedtrue returnauthorized vargroupsGroups.Split, stringusernamehttp.Context. User. Identity.Name tryauthorizedLDAPHelper.User. Is. Member.Of. Groupsusername,groups returnauthorized catchExceptionexthis.Log. Error Error attempting to authorize user,ex authorizedfalse returnauthorized authorizedfalse returnauthorized Notice that I also included a little code to distinguish between the user not being authenticated which the call to base.Authorize. Core takes care of and not being authorized.Without the code in Handle.Unauthorized. Request, if the user successfully logs in but is not in the AD group, he just sees the log in screen again which doesnt communicate the problem very well.The this. Log code uses a Nuget package called this.Log. The LDAPHelper class is something I wrote.The code is below publicstaticclass.LDAPHelperpublicstaticstring.Get. LDAPContainerUrildap.Uri Parse. LDAPConnection.Stringoutldap. Uri return.Http. Utility. Url.Decodeldap. Uri. Path.And. Query. Trim.Start publicstaticstring.Get. LDAPHostUrildap.Uri Parse. LDAPConnection.Stringoutldap. Uri returnldap.Uri. Host publicstaticbool.Parse. LDAPConnection.Stringout. Urildap.Uristringconn. StringConfiguration.Manager. Connection.StringsADConnection.String. Connection.String return. Uri.Try. Createconn. String,Uri.Kind. Absolute,outldap.Uri publicstaticbool.User. Is. Member.Of. Groupsstringusername,stringgroups Return true immediately if the authorization is not.AD group ifgroupsnullgroups.Length0returntrue Verify that the user is in the given AD group if any.Build. Principal.Contextvaruser. PrincipalUser.Principal. Find. By.Identitycontext,Identity.Type. Sam. Account.Name,username foreachvargroupingroupsifuser.Principal. Is. Member.Ofcontext,Identity.Type. Name,groupreturntrue returnfalse publicstatic.Principal. Context.Build. Principal.ContextstringcontainerLDAPHelper.Get. LDAPContainer returnnew.Principal. ContextContext.Type. Domain,null,container My code is mostly based on example code I found on a very helpful Stack.Overflow post. To use this code, all you have to do is use your custom Authorize.Attribute instead of the built in one.Something like this Authorize.ADGroupsSome AD group namepublicclass.Home. Controller Controller.Azure AD Connect sync Functions Reference.In Azure AD Connect, functions are used to manipulate an attribute value during synchronization.The Syntax of the functions is expressed using the following format lt output type Function.Namelt input type lt position name ,.If a function is overloaded and accepts multiple syntaxes, all valid syntaxes are listed.The functions are strongly typed and they verify that the type passed in matches the documented type.If the type does not match, an error is thrown.The types are expressed with the following syntax bin Binarybool Booleandt UTC DateTimeenum Enumeration of known constantsexp Expression, which is expected to evaluate to a Booleanmvbin Multi Valued Binarymvstr Multi Valued Stringmvref Multi Valued Referencenum Numericref Referencestr Stringvar A variant of almost any other typevoid doesnt return a value.The functions with the types mvbin, mvstr, and mvref can only work on multi valued attributes.Functions with bin, str, and ref work on both single valued and multi valued attributes.Functions Reference.Bit. And. Description The Bit.And function sets specified bits on a value.Syntax num Bit. Andnum value.ANDed together. Remarks This function converts both parameters to the binary representation and sets a bit to 0 if one or both of the corresponding bits in mask and flag are 0.In other words, it returns 0 in all cases except when the corresponding bits of both parameters are 1.Example Bit. And HF, HF7Returns 7 because hexadecimal F AND F7 evaluate to this value.Bit. Or. Description The Bit.Or function sets specified bits on a value.Syntax num Bit. Ornum value.ORed together. Remarks This function converts both parameters to the binary representation and sets a bit to 1 if one or both of the corresponding bits in mask and flag are 1, and to 0 if both of the corresponding bits are 0.In other words, it returns 1 in all cases except where the corresponding bits of both parameters are 0.CBool. Description The CBool function returns a Boolean based on the evaluated expression.Syntax bool CBoolexp ExpressionRemarks If the expression evaluates to a nonzero value, then CBool returns True, else it returns False.Example CBoolattrib.Returns True if both attributes have the same value.CDate. Description The CDate function returns a UTC Date.Time from a string.Date. Time is not a native attribute type in Sync but is used by some functions.Syntax dt CDatestr valueValue A string with a date, time, and optionally time zone.Remarks The returned string is always in UTC.Example CDateemployee.Start. TimeReturns a Date.Time based on the employees start time.CDate2. 01. 3 0. PM 8Returns a Date.Time representing 2.AMCert. Extension.Oids. Description Returns the Oid values of all the critical extensions of a certificate object.Syntax mvstr Cert.Extension. Oidsbinary certificate.Raw. Datacertificate.Raw. Data Byte array representation of an X.The byte array can be binary DER encoded or Base.X. 5. 09 data. Cert.Format. Description Returns the name of the format of this X.Syntax str Cert. Formatbinary certificate.Raw. Datacertificate.Raw. Data Byte array representation of an X.The byte array can be binary DER encoded or Base.X. 5. 09 data. Cert.Friendly. Name. Description Returns the associated alias for a certificate.Syntax str Cert. Friendly.Namebinary certificate. Great Secrets Nostradamus Rus Setup Movie on this page. Raw. Datacertificate.Raw. Data Byte array representation of an X.The byte array can be binary DER encoded or Base.X. 5. 09 data. Cert.Hash. String. Description Returns the SHA1 hash value for the X.Syntax str Cert. Hash.Stringbinary certificate.Raw. Datacertificate.Raw. Data Byte array representation of an X.The byte array can be binary DER encoded or Base.X. 5. 09 data. Cert.Issuer. Description Returns the name of the certificate authority that issued the X.Syntax str Cert. Issuerbinary certificate.Raw. Datacertificate.Raw. Data Byte array representation of an X.The byte array can be binary DER encoded or Base.X. 5. 09 data. Cert.Issuer. DNDescription Returns the distinguished name of the certificate issuer.Syntax str Cert. Issuer.DNbinary certificate.Raw. Datacertificate.Raw. Data Byte array representation of an X.The byte array can be binary DER encoded or Base.X. 5. 09 data. Cert.Issuer. Oid. Description Returns the Oid of the certificate issuer.Syntax str Cert. Issuer.Oidbinary certificate.Raw. Datacertificate.Raw. Data Byte array representation of an X.The byte array can be binary DER encoded or Base.X. 5. 09 data. Cert.Key. Algorithm. Description Returns the key algorithm information for this X.Syntax str Cert. Key.Algorithmbinary certificate.Raw. Datacertificate.Raw. Data Byte array representation of an X.The byte array can be binary DER encoded or Base.X. 5. 09 data. Cert.Key. Algorithm. Params.Description Returns the key algorithm parameters for the X.Syntax str Cert. Key.Algorithmbinary certificate.Raw. Datacertificate.Raw. Data Byte array representation of an X.The byte array can be binary DER encoded or Base.X. 5. 09 data. Cert.Name. Info. Description Returns the subject and issuer names from a certificate.Syntax str Cert. Name.Infobinary certificate.Raw. Data, str x.Name. Type, bool includes.Issuer. Namecertificate.Raw. Data Byte array representation of an X.The byte array can be binary DER encoded or Base.X. 5. 09 data. X5.Name. Type The X5.Name. Type value for the subject.Issuer. Name true to include the issuer name otherwise, false.Cert. Not. After.Description Returns the date in local time after which a certificate is no longer valid.Syntax dt Cert. Not.Afterbinary certificate.Raw. Datacertificate.Raw. Data Byte array representation of an X.The byte array can be binary DER encoded or Base.X. 5. 09 data. Cert.Not. Before. Description Returns the date in local time on which a certificate becomes valid.Syntax dt Cert. Not.Beforebinary certificate.Raw. Datacertificate.Raw. Data Byte array representation of an X.The byte array can be binary DER encoded or Base.X. 5. 09 data. Cert.Public. Key. Oid.Description Returns the Oid of the public key for the X.Syntax str Cert. Key.Algorithmbinary certificate.Raw. Datacertificate.Raw. Data Byte array representation of an X.The byte array can be binary DER encoded or Base.X. 5. 09 data. Cert.Public. Key. Parameters.Oid. Description Returns the Oid of the public key parameters for the X.Syntax str Cert. Public.Key. Parameters. Oidbinary certificate.Raw. Datacertificate.X. 5. 09 data. Cert.Serial. Number. Description Returns the serial number of the X.Syntax str Cert. Serial.Numberbinary certificate.Raw. Datacertificate.Raw. Data Byte array representation of an X.The byte array can be binary DER encoded or Base.X. 5. 09 data. Cert.Signature. Algorithm.Oid. Description Returns the Oid of the algorithm used to create the signature of a certificate.Syntax str Cert. Signature.Algorithm. Oidbinary certificate.Raw. Datacertificate.Raw. Data Byte array representation of an X.The byte array can be binary DER encoded or Base.X. 5. 09 data. Cert.Subject. Description Gets the subject distinguished name from a certificate.Syntax str Cert. Subjectbinary certificate.Raw. Datacertificate.Raw. Data Byte array representation of an X.The byte array can be binary DER encoded or Base.X. 5. 09 data. Cert.Subject. Name. DNDescription Returns the subject distinguished name from a certificate.Syntax str Cert. Subject.Name. DNbinary certificate.Raw. Datacertificate.Raw. Data Byte array representation of an X.The byte array can be binary DER encoded or Base.X. 5. 09 data. Cert.Subject. Name. Oid.Description Returns the Oid of the subject name from a certificate.Syntax str Cert. Subject.Name. Oidbinary certificate.Raw. Datacertificate.Raw. Data Byte array representation of an X.The byte array can be binary DER encoded or Base.X. 5. 09 data. Cert.Thumbprint. Description Returns the thumbprint of a certificate.Syntax str Cert. Thumbprintbinary certificate.Raw. Datacertificate.Raw. Data Byte array representation of an X.The byte array can be binary DER encoded or Base.X. 5. 09 data. Cert.Version. Description Returns the X.Syntax str Cert. Thumbprintbinary certificate.Raw. Datacertificate.
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