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Implement per-tenant cookie isolation for authentication #20

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Merged
idotta merged 2 commits into from
Jan 3, 2026
Merged

Implement per-tenant cookie isolation for authentication #20

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745c66f
Implement per-tenant cookie isolation for authentication
idotta Jan 3, 2026
cf4de37
Ensure tenant identifier is validated when configuring cookie options
idotta Jan 3, 2026
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11 changes: 10 additions & 1 deletion src/Idmt.Plugin/Extensions/ServiceCollectionExtensions.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -210,6 +210,16 @@ private static void ConfigureMultiTenant(IServiceCollection services, IdmtOption

// Enable per-tenant authentication - critical for proper multi-tenant isolation
builder.WithPerTenantAuthentication();


// Isolate Cookies per Tenant
builder.Services.ConfigurePerTenant<CookieAuthenticationOptions, IdmtTenantInfo>(
IdentityConstants.ApplicationScheme, (options, tenantInfo) =>
{
var tenantIdentifier = tenantInfo?.Identifier ?? throw new InvalidOperationException("Tenant information is required to configure cookie options.");
// Prevents Tenant A's tab from overwriting Tenant B's session
options.Cookie.Name = $"{idmtOptions.Identity.Cookie.Name}.{tenantIdentifier}";
});
}

private static void ConfigureIdentity(IServiceCollection services, IdmtOptions idmtOptions)
Expand Down Expand Up @@ -261,7 +271,6 @@ private static void ConfigureAuthentication(
authenticationBuilder.AddIdentityCookies();
services.ConfigureApplicationCookie(options =>
{
options.Cookie.Name = idmtOptions.Identity.Cookie.Name;
options.Cookie.HttpOnly = idmtOptions.Identity.Cookie.HttpOnly;
options.Cookie.SecurePolicy = idmtOptions.Identity.Cookie.SecurePolicy;
options.Cookie.SameSite = idmtOptions.Identity.Cookie.SameSite;
Expand Down