Classify SGU accounts into AD role groups

docs/architecture.md

@@ -72,6 +72,14 @@ is deliberately left unset because the verified page does not expose it.
 Missing metadata does not clear existing AD values and never changes the
 password outcome.
 
+Every synchronization also enforces one idempotent security-group membership
+from the classified institutional prefix: `AL` to `SGU-Alumnos`, `AD` to
+`SGU-Administrativos`, and `DO` to `SGU-Docentes`. This happens synchronously
+inside the broker before the institutional password is written to AD. A missing
+or inaccessible role group therefore fails provisioning instead of leaving a
+new usable account without its authorization classification. Existing accounts
+are repaired automatically on their next successful SGU authentication.
+
 Human-readable SGU values are decoded with BOM/header/meta detection, strict
 UTF-8 validation, and a Windows-1252 fallback for the legacy portal. Names and
 titles are normalized with Spanish-aware casing; particles such as `de`, `del`

docs/lab-runbook.md

@@ -98,6 +98,7 @@ Get-Service SGUAuthBroker
 Get-NetTCPConnection -LocalPort 8443 -State Listen
 sc.exe qfailure SGUAuthBroker
 Get-ADOrganizationalUnit -Filter * -SearchBase 'OU=Usuarios-SGU,DC=lci,DC=lasalle,DC=mx'
+Get-ADGroup -Filter 'SamAccountName -like "SGU-*"' -SearchBase 'OU=Usuarios-SGU,DC=lci,DC=lasalle,DC=mx'
 ```
 
 ## 4. Broker preflight from Windows 10

docs/monitoring.md

@@ -29,7 +29,8 @@ rol, `TraceId`, resultado y tiempo total. Los Event ID estables distinguen:
   IDs admitidos; `1202` timeout; `1203` excepción; `1204` página opcional no
   disponible;
 - `1300` fallo de sincronización AD; `1301` metadatos opcionales no aplicados;
-  `1302` membresía RDP opcional no aplicada.
+  `1302` membresía RDP opcional no aplicada; `1303` cuenta agregada a su grupo
+  institucional de Alumnos, Administrativos o Docentes.
 
 No se almacena HTML, contraseña, hash de contraseña ni contenido de la
 respuesta SGU.

scripts/Deploy-AuthBroker.ps1

@@ -31,6 +31,9 @@ param(
     [string]$BaseDn = 'DC=lci,DC=lasalle,DC=mx',
     [string]$DomainNetbios = 'LCI',
     [string]$UpnSuffix = 'lci.lasalle.mx',
+    [string]$ProfessorGroupDn = '',
+    [string]$StudentGroupDn = '',
+    [string]$AdministrativeGroupDn = '',
     [string]$RemoteDesktopGroupDn = '',
     [ValidateLength(1, 64)]
     [string]$DefaultCompany = 'La Salle',
@@ -72,10 +75,20 @@ if (-not $serverCertificate.Verify()) {
     throw 'The HTTPS server certificate chain is not trusted or is outside its validity period. Import the issuing CA chain; for a self-signed lab certificate, trust its public .cer in LocalMachine\Root.'
 }
 
-if ($CreateMissingOus) {
 Import-Module ActiveDirectory -ErrorAction Stop
 $usersOuName = 'Usuarios-SGU'
 $usersOuDn = "OU=$usersOuName,$BaseDn"
+if ([string]::IsNullOrWhiteSpace($ProfessorGroupDn)) {
+    $ProfessorGroupDn = "CN=SGU-Docentes,$usersOuDn"
+}
+if ([string]::IsNullOrWhiteSpace($StudentGroupDn)) {
+    $StudentGroupDn = "CN=SGU-Alumnos,$usersOuDn"
+}
+if ([string]::IsNullOrWhiteSpace($AdministrativeGroupDn)) {
+    $AdministrativeGroupDn = "CN=SGU-Administrativos,$usersOuDn"
+}
+
+if ($CreateMissingOus) {
     if (-not (Get-ADOrganizationalUnit -LDAPFilter "(ou=$usersOuName)" -SearchBase $BaseDn -SearchScope OneLevel -Server $LdapHost -ErrorAction SilentlyContinue)) {
         New-ADOrganizationalUnit -Name $usersOuName -Path $BaseDn -ProtectedFromAccidentalDeletion $true -Server $LdapHost | Out-Null
     }
@@ -117,8 +130,41 @@ if ($CreateMissingOus) {
     }
 }
 
+$roleGroupDefinitions = @(
+    [pscustomobject]@{ Role = 'Professor'; Dn = $ProfessorGroupDn; Description = 'SGU accounts with the DO institutional prefix.' }
+    [pscustomobject]@{ Role = 'Student'; Dn = $StudentGroupDn; Description = 'SGU accounts with the AL institutional prefix.' }
+    [pscustomobject]@{ Role = 'Administrative'; Dn = $AdministrativeGroupDn; Description = 'SGU accounts with the AD institutional prefix.' }
+)
+foreach ($definition in $roleGroupDefinitions) {
+    if (-not $definition.Dn.EndsWith(",$BaseDn", [StringComparison]::OrdinalIgnoreCase)) {
+        throw "$($definition.Role)GroupDn must identify a security group beneath BaseDn."
+    }
+
+    $roleGroup = Get-ADGroup -Identity $definition.Dn -Server $LdapHost -ErrorAction SilentlyContinue
+    if (-not $roleGroup -and $CreateMissingOus) {
+        $groupDnMatch = [regex]::Match($definition.Dn, '^CN=(?<Name>[^,]+),(?<Path>.+)$', [Text.RegularExpressions.RegexOptions]::IgnoreCase)
+        if (-not $groupDnMatch.Success) {
+            throw "$($definition.Role)GroupDn must start with a simple CN component."
+        }
+        $groupName = $groupDnMatch.Groups['Name'].Value
+        if ($groupName.Length -gt 20) {
+            throw "$($definition.Role) group name exceeds the 20-character sAMAccountName limit."
+        }
+        New-ADGroup -Name $groupName -SamAccountName $groupName `
+            -GroupCategory Security -GroupScope Global `
+            -Path $groupDnMatch.Groups['Path'].Value `
+            -Description $definition.Description -Server $LdapHost | Out-Null
+        $roleGroup = Get-ADGroup -Identity $definition.Dn -Server $LdapHost -ErrorAction Stop
+    }
+    if (-not $roleGroup) {
+        throw "The required $($definition.Role) security group does not exist: $($definition.Dn)"
+    }
+    if ($roleGroup.GroupCategory -ne 'Security') {
+        throw "$($definition.Role)GroupDn must identify a security group."
+    }
+}
+
 if ($RemoteDesktopGroupDn) {
-    Import-Module ActiveDirectory -ErrorAction Stop
     $remoteDesktopGroup = Get-ADGroup -Identity $RemoteDesktopGroupDn -Server $LdapHost -ErrorAction Stop
     if ($remoteDesktopGroup.GroupCategory -ne 'Security' -or
         -not $remoteDesktopGroup.DistinguishedName.EndsWith(",$BaseDn", [StringComparison]::OrdinalIgnoreCase)) {
@@ -186,6 +232,9 @@ $productionSettings = @{
             ProfessorOuDn = "OU=Docentes,OU=Usuarios-SGU,$BaseDn"
             StudentOuDn = "OU=Alumnos,OU=Usuarios-SGU,$BaseDn"
             AdministrativeOuDn = "OU=Administrativos,OU=Usuarios-SGU,$BaseDn"
+            ProfessorGroupDn = $ProfessorGroupDn
+            StudentGroupDn = $StudentGroupDn
+            AdministrativeGroupDn = $AdministrativeGroupDn
             RemoteDesktopGroupDn = $RemoteDesktopGroupDn
             DefaultCompany = $DefaultCompany
             CreateMissingOus = [bool]$CreateMissingOus

scripts/Get-SguBrokerLog.ps1

@@ -32,6 +32,7 @@ $eventNames = @{
     1300 = 'DirectorySynchronizationFailure'
     1301 = 'DirectoryOptionalMetadataFailure'
     1302 = 'DirectoryGroupMembershipFailure'
+    1303 = 'DirectoryRoleGroupMembershipAdded'
 }
 
 # Keep these reads unfiltered. Besides making archived and current logs behave

scripts/Publish-GiteaRelease.ps1

@@ -102,6 +102,7 @@ Bootstrap reproducible para el laboratorio SGU.
 - `sgu-server-bootstrap-$Version.zip`: crea el bosque AD/DNS, OUs, grupo RDP, GPO, recurso `Packages`, broker mTLS y administración remota; se reanuda solo después del reinicio.
 - `sgu-client-bootstrap-$Version.zip`: registra un certificado mTLS único, instala y valida el Credential Provider antes de unir el equipo al dominio, habilita RDP/WinRM y se repara al arranque.
 - `sgu-linux-client-bootstrap-$Version.zip`: une clientes Debian/Ubuntu o RHEL/Fedora/Rocky/AlmaLinux con realmd, Kerberos y SSSD. Solicita interactivamente la contraseña de unión y no instala el Credential Provider de Windows.
+- El Auth Broker clasifica sin tareas programadas cada cuenta autenticada: `AL` se agrega a `SGU-Alumnos`, `AD` a `SGU-Administrativos` y `DO` a `SGU-Docentes`; el bootstrap crea estos grupos de seguridad de forma idempotente.
 - El servidor configura WEF/WEC para registrar sesiones y fallos, inventariar el estado alcanzable de las máquinas cada cinco minutos y conservar durante 183 días tanto esos eventos como el diagnóstico estructurado del Auth Broker.
 - Windows Home se detecta y se rechaza con una explicación, ya que no admite unión a Active Directory ni RDP host.
 

src/SGU.AuthBroker/BrokerEventIds.cs

@@ -21,4 +21,5 @@ internal static class BrokerEventIds
     internal static readonly EventId DirectorySynchronizationFailure = new(1300, nameof(DirectorySynchronizationFailure));
     internal static readonly EventId DirectoryOptionalMetadataFailure = new(1301, nameof(DirectoryOptionalMetadataFailure));
     internal static readonly EventId DirectoryGroupMembershipFailure = new(1302, nameof(DirectoryGroupMembershipFailure));
+    internal static readonly EventId DirectoryRoleGroupMembershipAdded = new(1303, nameof(DirectoryRoleGroupMembershipAdded));
 }

src/SGU.AuthBroker/Options/BrokerOptions.cs

@@ -87,6 +87,14 @@ public sealed class BrokerOptions
             {
                 throw new InvalidOperationException($"The OU mapping for {role} must be beneath BaseDn.");
             }
+
+            string groupDn = Directory.GetGroupDn(role);
+            if (string.IsNullOrWhiteSpace(groupDn) ||
+                !groupDn.StartsWith("CN=", StringComparison.OrdinalIgnoreCase) ||
+                !groupDn.EndsWith($",{Directory.BaseDn}", StringComparison.OrdinalIgnoreCase))
+            {
+                throw new InvalidOperationException($"The security-group mapping for {role} must identify a group beneath BaseDn.");
+            }
         }
 
         if (!string.IsNullOrWhiteSpace(Directory.RemoteDesktopGroupDn) &&
@@ -168,6 +176,12 @@ public sealed class ActiveDirectoryOptions
 
     public string AdministrativeOuDn { get; init; } = "OU=Administrativos,OU=Usuarios-SGU,DC=lci,DC=lasalle,DC=mx";
 
+    public string ProfessorGroupDn { get; init; } = "CN=SGU-Docentes,OU=Usuarios-SGU,DC=lci,DC=lasalle,DC=mx";
+
+    public string StudentGroupDn { get; init; } = "CN=SGU-Alumnos,OU=Usuarios-SGU,DC=lci,DC=lasalle,DC=mx";
+
+    public string AdministrativeGroupDn { get; init; } = "CN=SGU-Administrativos,OU=Usuarios-SGU,DC=lci,DC=lasalle,DC=mx";
+
     public string RemoteDesktopGroupDn { get; init; } = string.Empty;
 
     public string DefaultCompany { get; init; } = "La Salle";
@@ -181,4 +195,12 @@ public sealed class ActiveDirectoryOptions
         InstitutionalRole.Administrative => AdministrativeOuDn,
         _ => throw new ArgumentOutOfRangeException(nameof(role), role, null)
     };
+
+    public string GetGroupDn(InstitutionalRole role) => role switch
+    {
+        InstitutionalRole.Professor => ProfessorGroupDn,
+        InstitutionalRole.Student => StudentGroupDn,
+        InstitutionalRole.Administrative => AdministrativeGroupDn,
+        _ => throw new ArgumentOutOfRangeException(nameof(role), role, null)
+    };
 }

src/SGU.AuthBroker/Services/ActiveDirectorySynchronizer.cs

@@ -109,6 +109,12 @@ public sealed class ActiveDirectorySynchronizer(
                 user.CommitChanges();
             }
 
+            // Role membership is part of account provisioning, not optional
+            // enrichment. Do it before changing the password so a missing or
+            // inaccessible authorization group cannot leave a newly usable
+            // account without its required classification.
+            EnsureRoleGroupMembership(user, identity);
+
             // The exact institutional password received by the broker is passed to AD.
             // It is not derived, transformed, written to disk, or included in logs.
             user.Invoke("SetPassword", [password]);
@@ -195,6 +201,33 @@ public sealed class ActiveDirectorySynchronizer(
         }
     }
 
+    private void EnsureRoleGroupMembership(DirectoryEntry user, UserIdentity identity)
+    {
+        user.RefreshCache(["distinguishedName"]);
+        string? userDn = Convert.ToString(user.Properties["distinguishedName"].Value);
+        if (string.IsNullOrWhiteSpace(userDn))
+        {
+            throw new InvalidOperationException($"Active Directory did not return a distinguished name for {identity.UserName}.");
+        }
+
+        string groupDn = options.GetGroupDn(identity.Role);
+        using DirectoryEntry group = Bind(groupDn);
+        _ = group.NativeObject;
+        if (group.Properties["member"].Contains(userDn))
+        {
+            return;
+        }
+
+        group.Properties["member"].Add(userDn);
+        group.CommitChanges();
+        logger.LogInformation(
+            BrokerEventIds.DirectoryRoleGroupMembershipAdded,
+            "Added {InstitutionalUser} with role {Role} to Active Directory security group {GroupDn}.",
+            identity.UserName,
+            identity.Role,
+            groupDn);
+    }
+
     private void TryEnsureRemoteDesktopGroupMembership(DirectoryEntry user, string institutionalUser)
     {
         if (string.IsNullOrWhiteSpace(options.RemoteDesktopGroupDn))

src/SGU.AuthBroker/appsettings.json

@@ -50,6 +50,9 @@
       "ProfessorOuDn": "OU=Docentes,OU=Usuarios-SGU,DC=lci,DC=lasalle,DC=mx",
       "StudentOuDn": "OU=Alumnos,OU=Usuarios-SGU,DC=lci,DC=lasalle,DC=mx",
       "AdministrativeOuDn": "OU=Administrativos,OU=Usuarios-SGU,DC=lci,DC=lasalle,DC=mx",
+      "ProfessorGroupDn": "CN=SGU-Docentes,OU=Usuarios-SGU,DC=lci,DC=lasalle,DC=mx",
+      "StudentGroupDn": "CN=SGU-Alumnos,OU=Usuarios-SGU,DC=lci,DC=lasalle,DC=mx",
+      "AdministrativeGroupDn": "CN=SGU-Administrativos,OU=Usuarios-SGU,DC=lci,DC=lasalle,DC=mx",
       "RemoteDesktopGroupDn": "",
       "DefaultCompany": "La Salle",
       "CreateMissingOus": false

tests/SGU.AuthBroker.Tests/BrokerOptionsTests.cs

@@ -1,4 +1,5 @@
 using SGU.AuthBroker.Options;
+using SGU.AuthBroker.Core.Identity;
 using Xunit;
 
 namespace SGU.AuthBroker.Tests;
@@ -28,4 +29,31 @@ public sealed class BrokerOptionsTests
 
         Assert.Contains("thumbprint", exception.Message, StringComparison.OrdinalIgnoreCase);
     }
+
+    [Theory]
+    [InlineData(InstitutionalRole.Student, "CN=SGU-Alumnos,OU=Usuarios-SGU,DC=lci,DC=lasalle,DC=mx")]
+    [InlineData(InstitutionalRole.Administrative, "CN=SGU-Administrativos,OU=Usuarios-SGU,DC=lci,DC=lasalle,DC=mx")]
+    [InlineData(InstitutionalRole.Professor, "CN=SGU-Docentes,OU=Usuarios-SGU,DC=lci,DC=lasalle,DC=mx")]
+    public void DefaultRoleGroupMappingsMatchInstitutionalPrefixes(InstitutionalRole role, string expectedGroupDn)
+    {
+        ActiveDirectoryOptions options = new();
+
+        Assert.Equal(expectedGroupDn, options.GetGroupDn(role));
+    }
+
+    [Fact]
+    public void ValidateRejectsARoleGroupOutsideTheConfiguredDirectoryBase()
+    {
+        BrokerOptions options = new()
+        {
+            Directory = new ActiveDirectoryOptions
+            {
+                StudentGroupDn = "CN=SGU-Alumnos,DC=example,DC=invalid"
+            }
+        };
+
+        InvalidOperationException exception = Assert.Throws<InvalidOperationException>(options.Validate);
+
+        Assert.Contains("security-group", exception.Message, StringComparison.OrdinalIgnoreCase);
+    }
 }