From 792158c2cba1aecb6357448ccd48214adeebf71c Mon Sep 17 00:00:00 2001
From: Nafees Nazik <84864519+G3root@users.noreply.github.com>
Date: Fri, 1 Dec 2023 05:52:16 +0530
Subject: [PATCH] feat: add two factor auth (#643)

Add two factor authentication for users who wish to enhance the security of their accounts.
---
 .env.example                                  |   5 +
 apps/web/package.json                         |   1 +
 .../app/(dashboard)/settings/billing/page.tsx |   2 +-
 .../(dashboard)/settings/password/page.tsx    |  20 +-
 .../app/(dashboard)/settings/profile/page.tsx |   2 +-
 .../(dashboard)/settings/security/page.tsx    |  46 ++
 .../(dashboard)/layout/profile-dropdown.tsx   |   8 +-
 .../settings/layout/desktop-nav.tsx           |  10 +-
 .../settings/layout/mobile-nav.tsx            |  10 +-
 .../forms/2fa/authenticator-app.tsx           |  58 +++
 .../2fa/disable-authenticator-app-dialog.tsx  | 161 ++++++
 .../2fa/enable-authenticator-app-dialog.tsx   | 283 +++++++++++
 .../forms/2fa/recovery-code-list.tsx          |  57 +++
 .../components/forms/2fa/recovery-codes.tsx   |  43 ++
 .../forms/2fa/view-recovery-codes-dialog.tsx  | 151 ++++++
 apps/web/src/components/forms/signin.tsx      | 167 ++++--
 package-lock.json                             | 480 +++++++++++++++++-
 packages/lib/constants/crypto.ts              |   1 +
 packages/lib/next-auth/auth-options.ts        |  24 +-
 packages/lib/next-auth/error-codes.ts         |  11 +
 packages/lib/package.json                     |   3 +
 packages/lib/server-only/2fa/disable-2fa.ts   |  48 ++
 packages/lib/server-only/2fa/enable-2fa.ts    |  47 ++
 .../lib/server-only/2fa/get-backup-code.ts    |  38 ++
 .../lib/server-only/2fa/is-2fa-availble.ts    |  17 +
 packages/lib/server-only/2fa/setup-2fa.ts     |  76 +++
 packages/lib/server-only/2fa/validate-2fa.ts  |  35 ++
 .../lib/server-only/2fa/verify-2fa-token.ts   |  33 ++
 .../lib/server-only/2fa/verify-backup-code.ts |  18 +
 packages/lib/server-only/auth/hash.ts         |   6 +-
 packages/lib/universal/crypto.ts              |  32 ++
 .../20231105184518_add_2fa/migration.sql      |   4 +
 packages/prisma/schema.prisma                 |  41 +-
 packages/trpc/package.json                    |   3 +-
 packages/trpc/server/auth-router/router.ts    |  25 +-
 packages/trpc/server/auth-router/schema.ts    |   2 +
 packages/trpc/server/router.ts                |   2 +
 .../router.ts                                 | 105 ++++
 .../schema.ts                                 |  32 ++
 packages/tsconfig/process-env.d.ts            |   1 +
 packages/ui/primitives/input.tsx              |  39 +-
 turbo.json                                    |   1 +
 42 files changed, 2056 insertions(+), 92 deletions(-)
 create mode 100644 apps/web/src/app/(dashboard)/settings/security/page.tsx
 create mode 100644 apps/web/src/components/forms/2fa/authenticator-app.tsx
 create mode 100644 apps/web/src/components/forms/2fa/disable-authenticator-app-dialog.tsx
 create mode 100644 apps/web/src/components/forms/2fa/enable-authenticator-app-dialog.tsx
 create mode 100644 apps/web/src/components/forms/2fa/recovery-code-list.tsx
 create mode 100644 apps/web/src/components/forms/2fa/recovery-codes.tsx
 create mode 100644 apps/web/src/components/forms/2fa/view-recovery-codes-dialog.tsx
 create mode 100644 packages/lib/constants/crypto.ts
 create mode 100644 packages/lib/server-only/2fa/disable-2fa.ts
 create mode 100644 packages/lib/server-only/2fa/enable-2fa.ts
 create mode 100644 packages/lib/server-only/2fa/get-backup-code.ts
 create mode 100644 packages/lib/server-only/2fa/is-2fa-availble.ts
 create mode 100644 packages/lib/server-only/2fa/setup-2fa.ts
 create mode 100644 packages/lib/server-only/2fa/validate-2fa.ts
 create mode 100644 packages/lib/server-only/2fa/verify-2fa-token.ts
 create mode 100644 packages/lib/server-only/2fa/verify-backup-code.ts
 create mode 100644 packages/lib/universal/crypto.ts
 create mode 100644 packages/prisma/migrations/20231105184518_add_2fa/migration.sql
 create mode 100644 packages/trpc/server/two-factor-authentication-router/router.ts
 create mode 100644 packages/trpc/server/two-factor-authentication-router/schema.ts

diff --git a/.env.example b/.env.example
index 7bd71c04b..45c26f6be 100644
--- a/.env.example
+++ b/.env.example
@@ -2,6 +2,11 @@
 NEXTAUTH_URL="http://localhost:3000"
 NEXTAUTH_SECRET="secret"
 
+# [[CRYPTO]]
+# Application Key for symmetric encryption and decryption
+# This should be a random string of at least 32 characters
+NEXT_PRIVATE_ENCRYPTION_KEY="CAFEBABE"
+
 # [[AUTH OPTIONAL]]
 NEXT_PRIVATE_GOOGLE_CLIENT_ID=""
 NEXT_PRIVATE_GOOGLE_CLIENT_SECRET=""
diff --git a/apps/web/package.json b/apps/web/package.json
index aed5aef06..b5bb1c218 100644
--- a/apps/web/package.json
+++ b/apps/web/package.json
@@ -44,6 +44,7 @@
     "sharp": "0.32.5",
     "ts-pattern": "^5.0.5",
     "typescript": "5.2.2",
+    "uqr": "^0.1.2",
     "zod": "^3.22.4"
   },
   "devDependencies": {
diff --git a/apps/web/src/app/(dashboard)/settings/billing/page.tsx b/apps/web/src/app/(dashboard)/settings/billing/page.tsx
index c7161f4ae..61dff3216 100644
--- a/apps/web/src/app/(dashboard)/settings/billing/page.tsx
+++ b/apps/web/src/app/(dashboard)/settings/billing/page.tsx
@@ -41,7 +41,7 @@ export default async function BillingSettingsPage() {
 
   return (
     <div>
-      <h3 className="text-lg font-medium">Billing</h3>
+      <h3 className="text-2xl font-semibold">Billing</h3>
 
       <div className="text-muted-foreground mt-2 text-sm">
         {isMissingOrInactiveOrFreePlan && (
diff --git a/apps/web/src/app/(dashboard)/settings/password/page.tsx b/apps/web/src/app/(dashboard)/settings/password/page.tsx
index 701335180..dd344a1d1 100644
--- a/apps/web/src/app/(dashboard)/settings/password/page.tsx
+++ b/apps/web/src/app/(dashboard)/settings/password/page.tsx
@@ -1,19 +1,5 @@
-import { getRequiredServerComponentSession } from '@documenso/lib/next-auth/get-server-component-session';
+import { redirect } from 'next/navigation';
 
-import { PasswordForm } from '~/components/forms/password';
-
-export default async function PasswordSettingsPage() {
-  const { user } = await getRequiredServerComponentSession();
-
-  return (
-    <div>
-      <h3 className="text-lg font-medium">Password</h3>
-
-      <p className="text-muted-foreground mt-2 text-sm">Here you can update your password.</p>
-
-      <hr className="my-4" />
-
-      <PasswordForm user={user} className="max-w-xl" />
-    </div>
-  );
+export default function PasswordSettingsPage() {
+  redirect('/settings/security');
 }
diff --git a/apps/web/src/app/(dashboard)/settings/profile/page.tsx b/apps/web/src/app/(dashboard)/settings/profile/page.tsx
index b577ec93e..cb64fb9cd 100644
--- a/apps/web/src/app/(dashboard)/settings/profile/page.tsx
+++ b/apps/web/src/app/(dashboard)/settings/profile/page.tsx
@@ -7,7 +7,7 @@ export default async function ProfileSettingsPage() {
 
   return (
     <div>
-      <h3 className="text-lg font-medium">Profile</h3>
+      <h3 className="text-2xl font-semibold">Profile</h3>
 
       <p className="text-muted-foreground mt-2 text-sm">Here you can edit your personal details.</p>
 
diff --git a/apps/web/src/app/(dashboard)/settings/security/page.tsx b/apps/web/src/app/(dashboard)/settings/security/page.tsx
new file mode 100644
index 000000000..9e99b73e8
--- /dev/null
+++ b/apps/web/src/app/(dashboard)/settings/security/page.tsx
@@ -0,0 +1,46 @@
+import { getRequiredServerComponentSession } from '@documenso/lib/next-auth/get-server-component-session';
+
+import { AuthenticatorApp } from '~/components/forms/2fa/authenticator-app';
+import { RecoveryCodes } from '~/components/forms/2fa/recovery-codes';
+import { PasswordForm } from '~/components/forms/password';
+
+export default async function SecuritySettingsPage() {
+  const { user } = await getRequiredServerComponentSession();
+
+  return (
+    <div>
+      <h3 className="text-2xl font-semibold">Security</h3>
+
+      <p className="text-muted-foreground mt-2 text-sm">
+        Here you can manage your password and security settings.
+      </p>
+
+      <hr className="my-4" />
+
+      <PasswordForm user={user} className="max-w-xl" />
+
+      <hr className="mb-4 mt-8" />
+
+      <h4 className="text-lg font-medium">Two Factor Authentication</h4>
+
+      <p className="text-muted-foreground mt-2 text-sm">
+        Add and manage your two factor security settings to add an extra layer of security to your
+        account!
+      </p>
+
+      <div className="mt-4 max-w-xl">
+        <h5 className="font-medium">Two-factor methods</h5>
+
+        <AuthenticatorApp isTwoFactorEnabled={user.twoFactorEnabled} />
+      </div>
+
+      {user.twoFactorEnabled && (
+        <div className="mt-4 max-w-xl">
+          <h5 className="font-medium">Recovery methods</h5>
+
+          <RecoveryCodes isTwoFactorEnabled={user.twoFactorEnabled} />
+        </div>
+      )}
+    </div>
+  );
+}
diff --git a/apps/web/src/components/(dashboard)/layout/profile-dropdown.tsx b/apps/web/src/components/(dashboard)/layout/profile-dropdown.tsx
index d699dea4b..99761a0d3 100644
--- a/apps/web/src/components/(dashboard)/layout/profile-dropdown.tsx
+++ b/apps/web/src/components/(dashboard)/layout/profile-dropdown.tsx
@@ -4,7 +4,7 @@ import Link from 'next/link';
 
 import {
   CreditCard,
-  Key,
+  Lock,
   LogOut,
   User as LucideUser,
   Monitor,
@@ -87,9 +87,9 @@ export const ProfileDropdown = ({ user }: ProfileDropdownProps) => {
         </DropdownMenuItem>
 
         <DropdownMenuItem asChild>
-          <Link href="/settings/password" className="cursor-pointer">
-            <Key className="mr-2 h-4 w-4" />
-            Password
+          <Link href="/settings/security" className="cursor-pointer">
+            <Lock className="mr-2 h-4 w-4" />
+            Security
           </Link>
         </DropdownMenuItem>
 
diff --git a/apps/web/src/components/(dashboard)/settings/layout/desktop-nav.tsx b/apps/web/src/components/(dashboard)/settings/layout/desktop-nav.tsx
index 901c6a5ae..f4b2aae5e 100644
--- a/apps/web/src/components/(dashboard)/settings/layout/desktop-nav.tsx
+++ b/apps/web/src/components/(dashboard)/settings/layout/desktop-nav.tsx
@@ -5,7 +5,7 @@ import { HTMLAttributes } from 'react';
 import Link from 'next/link';
 import { usePathname } from 'next/navigation';
 
-import { CreditCard, Key, User } from 'lucide-react';
+import { CreditCard, Lock, User } from 'lucide-react';
 
 import { useFeatureFlags } from '@documenso/lib/client-only/providers/feature-flag';
 import { cn } from '@documenso/ui/lib/utils';
@@ -35,16 +35,16 @@ export const DesktopNav = ({ className, ...props }: DesktopNavProps) => {
         </Button>
       </Link>
 
-      <Link href="/settings/password">
+      <Link href="/settings/security">
         <Button
           variant="ghost"
           className={cn(
             'w-full justify-start',
-            pathname?.startsWith('/settings/password') && 'bg-secondary',
+            pathname?.startsWith('/settings/security') && 'bg-secondary',
           )}
         >
-          <Key className="mr-2 h-5 w-5" />
-          Password
+          <Lock className="mr-2 h-5 w-5" />
+          Security
         </Button>
       </Link>
 
diff --git a/apps/web/src/components/(dashboard)/settings/layout/mobile-nav.tsx b/apps/web/src/components/(dashboard)/settings/layout/mobile-nav.tsx
index ffe2b0d80..28ffc960f 100644
--- a/apps/web/src/components/(dashboard)/settings/layout/mobile-nav.tsx
+++ b/apps/web/src/components/(dashboard)/settings/layout/mobile-nav.tsx
@@ -5,7 +5,7 @@ import { HTMLAttributes } from 'react';
 import Link from 'next/link';
 import { usePathname } from 'next/navigation';
 
-import { CreditCard, Key, User } from 'lucide-react';
+import { CreditCard, Lock, User } from 'lucide-react';
 
 import { useFeatureFlags } from '@documenso/lib/client-only/providers/feature-flag';
 import { cn } from '@documenso/ui/lib/utils';
@@ -38,16 +38,16 @@ export const MobileNav = ({ className, ...props }: MobileNavProps) => {
         </Button>
       </Link>
 
-      <Link href="/settings/password">
+      <Link href="/settings/security">
         <Button
           variant="ghost"
           className={cn(
             'w-full justify-start',
-            pathname?.startsWith('/settings/password') && 'bg-secondary',
+            pathname?.startsWith('/settings/security') && 'bg-secondary',
           )}
         >
-          <Key className="mr-2 h-5 w-5" />
-          Password
+          <Lock className="mr-2 h-5 w-5" />
+          Security
         </Button>
       </Link>
 
diff --git a/apps/web/src/components/forms/2fa/authenticator-app.tsx b/apps/web/src/components/forms/2fa/authenticator-app.tsx
new file mode 100644
index 000000000..1d164bd22
--- /dev/null
+++ b/apps/web/src/components/forms/2fa/authenticator-app.tsx
@@ -0,0 +1,58 @@
+'use client';
+
+import { useState } from 'react';
+
+import { Button } from '@documenso/ui/primitives/button';
+
+import { DisableAuthenticatorAppDialog } from './disable-authenticator-app-dialog';
+import { EnableAuthenticatorAppDialog } from './enable-authenticator-app-dialog';
+
+type AuthenticatorAppProps = {
+  isTwoFactorEnabled: boolean;
+};
+
+export const AuthenticatorApp = ({ isTwoFactorEnabled }: AuthenticatorAppProps) => {
+  const [modalState, setModalState] = useState<'enable' | 'disable' | null>(null);
+
+  const isEnableDialogOpen = modalState === 'enable';
+  const isDisableDialogOpen = modalState === 'disable';
+
+  return (
+    <>
+      <div className="mt-4 flex flex-col justify-between gap-4 rounded-lg border p-4 md:flex-row md:items-center md:gap-8">
+        <div className="flex-1">
+          <p>Authenticator app</p>
+
+          <p className="text-muted-foreground mt-2 max-w-[50ch] text-sm">
+            Create one-time passwords that serve as a secondary authentication method for confirming
+            your identity when requested during the sign-in process.
+          </p>
+        </div>
+
+        <div>
+          {isTwoFactorEnabled ? (
+            <Button variant="destructive" onClick={() => setModalState('disable')} size="sm">
+              Disable 2FA
+            </Button>
+          ) : (
+            <Button onClick={() => setModalState('enable')} size="sm">
+              Enable 2FA
+            </Button>
+          )}
+        </div>
+      </div>
+
+      <EnableAuthenticatorAppDialog
+        key={isEnableDialogOpen ? 'open' : 'closed'}
+        open={isEnableDialogOpen}
+        onOpenChange={(open) => !open && setModalState(null)}
+      />
+
+      <DisableAuthenticatorAppDialog
+        key={isDisableDialogOpen ? 'open' : 'closed'}
+        open={isDisableDialogOpen}
+        onOpenChange={(open) => !open && setModalState(null)}
+      />
+    </>
+  );
+};
diff --git a/apps/web/src/components/forms/2fa/disable-authenticator-app-dialog.tsx b/apps/web/src/components/forms/2fa/disable-authenticator-app-dialog.tsx
new file mode 100644
index 000000000..eac574181
--- /dev/null
+++ b/apps/web/src/components/forms/2fa/disable-authenticator-app-dialog.tsx
@@ -0,0 +1,161 @@
+import { useRouter } from 'next/navigation';
+
+import { zodResolver } from '@hookform/resolvers/zod';
+import { flushSync } from 'react-dom';
+import { useForm } from 'react-hook-form';
+import { z } from 'zod';
+
+import { trpc } from '@documenso/trpc/react';
+import { Button } from '@documenso/ui/primitives/button';
+import {
+  Dialog,
+  DialogContent,
+  DialogDescription,
+  DialogHeader,
+  DialogTitle,
+} from '@documenso/ui/primitives/dialog';
+import {
+  Form,
+  FormControl,
+  FormField,
+  FormItem,
+  FormLabel,
+  FormMessage,
+} from '@documenso/ui/primitives/form/form';
+import { Input } from '@documenso/ui/primitives/input';
+import { useToast } from '@documenso/ui/primitives/use-toast';
+
+export const ZDisableTwoFactorAuthenticationForm = z.object({
+  password: z.string().min(6).max(72),
+  backupCode: z.string(),
+});
+
+export type TDisableTwoFactorAuthenticationForm = z.infer<
+  typeof ZDisableTwoFactorAuthenticationForm
+>;
+
+export type DisableAuthenticatorAppDialogProps = {
+  open: boolean;
+  onOpenChange: (_open: boolean) => void;
+};
+
+export const DisableAuthenticatorAppDialog = ({
+  open,
+  onOpenChange,
+}: DisableAuthenticatorAppDialogProps) => {
+  const router = useRouter();
+  const { toast } = useToast();
+
+  const { mutateAsync: disableTwoFactorAuthentication } =
+    trpc.twoFactorAuthentication.disable.useMutation();
+
+  const disableTwoFactorAuthenticationForm = useForm<TDisableTwoFactorAuthenticationForm>({
+    defaultValues: {
+      password: '',
+      backupCode: '',
+    },
+    resolver: zodResolver(ZDisableTwoFactorAuthenticationForm),
+  });
+
+  const { isSubmitting: isDisableTwoFactorAuthenticationSubmitting } =
+    disableTwoFactorAuthenticationForm.formState;
+
+  const onDisableTwoFactorAuthenticationFormSubmit = async ({
+    password,
+    backupCode,
+  }: TDisableTwoFactorAuthenticationForm) => {
+    try {
+      await disableTwoFactorAuthentication({ password, backupCode });
+
+      toast({
+        title: 'Two-factor authentication disabled',
+        description:
+          'Two-factor authentication has been disabled for your account. You will no longer be required to enter a code from your authenticator app when signing in.',
+      });
+
+      flushSync(() => {
+        onOpenChange(false);
+      });
+
+      router.refresh();
+    } catch (_err) {
+      toast({
+        title: 'Unable to disable two-factor authentication',
+        description:
+          'We were unable to disable two-factor authentication for your account. Please ensure that you have entered your password and backup code correctly and try again.',
+        variant: 'destructive',
+      });
+    }
+  };
+
+  return (
+    <Dialog open={open} onOpenChange={onOpenChange}>
+      <DialogContent className="w-full max-w-xl md:max-w-xl lg:max-w-xl">
+        <DialogHeader>
+          <DialogTitle>Disable Authenticator App</DialogTitle>
+
+          <DialogDescription>
+            To disable the Authenticator App for your account, please enter your password and a
+            backup code. If you do not have a backup code available, please contact support.
+          </DialogDescription>
+        </DialogHeader>
+
+        <Form {...disableTwoFactorAuthenticationForm}>
+          <form
+            onSubmit={disableTwoFactorAuthenticationForm.handleSubmit(
+              onDisableTwoFactorAuthenticationFormSubmit,
+            )}
+            className="flex flex-col gap-y-4"
+          >
+            <FormField
+              name="password"
+              control={disableTwoFactorAuthenticationForm.control}
+              render={({ field }) => (
+                <FormItem>
+                  <FormLabel className="text-muted-foreground">Password</FormLabel>
+                  <FormControl>
+                    <Input
+                      {...field}
+                      type="password"
+                      autoComplete="current-password"
+                      value={field.value ?? ''}
+                    />
+                  </FormControl>
+                  <FormMessage />
+                </FormItem>
+              )}
+            />
+
+            <FormField
+              name="backupCode"
+              control={disableTwoFactorAuthenticationForm.control}
+              render={({ field }) => (
+                <FormItem>
+                  <FormLabel className="text-muted-foreground">Backup Code</FormLabel>
+                  <FormControl>
+                    <Input {...field} type="text" value={field.value ?? ''} />
+                  </FormControl>
+                  <FormMessage />
+                </FormItem>
+              )}
+            />
+
+            <div className="flex w-full items-center justify-between">
+              <Button type="button" variant="ghost" onClick={() => onOpenChange(false)}>
+                Cancel
+              </Button>
+
+              <Button
+                type="submit"
+                variant="destructive"
+                loading={isDisableTwoFactorAuthenticationSubmitting}
+              >
+                Disable 2FA
+              </Button>
+            </div>
+          </form>
+        </Form>
+      </DialogContent>
+    </Dialog>
+  );
+};
diff --git a/apps/web/src/components/forms/2fa/enable-authenticator-app-dialog.tsx b/apps/web/src/components/forms/2fa/enable-authenticator-app-dialog.tsx
new file mode 100644
index 000000000..8bf835ef5
--- /dev/null
+++ b/apps/web/src/components/forms/2fa/enable-authenticator-app-dialog.tsx
@@ -0,0 +1,283 @@
+import { useMemo } from 'react';
+
+import { useRouter } from 'next/navigation';
+
+import { zodResolver } from '@hookform/resolvers/zod';
+import { flushSync } from 'react-dom';
+import { useForm } from 'react-hook-form';
+import { match } from 'ts-pattern';
+import { renderSVG } from 'uqr';
+import { z } from 'zod';
+
+import { trpc } from '@documenso/trpc/react';
+import { Button } from '@documenso/ui/primitives/button';
+import {
+  Dialog,
+  DialogContent,
+  DialogDescription,
+  DialogHeader,
+  DialogTitle,
+} from '@documenso/ui/primitives/dialog';
+import {
+  Form,
+  FormControl,
+  FormField,
+  FormItem,
+  FormLabel,
+  FormMessage,
+} from '@documenso/ui/primitives/form/form';
+import { Input } from '@documenso/ui/primitives/input';
+import { useToast } from '@documenso/ui/primitives/use-toast';
+
+import { RecoveryCodeList } from './recovery-code-list';
+
+export const ZSetupTwoFactorAuthenticationForm = z.object({
+  password: z.string().min(6).max(72),
+});
+
+export type TSetupTwoFactorAuthenticationForm = z.infer<typeof ZSetupTwoFactorAuthenticationForm>;
+
+export const ZEnableTwoFactorAuthenticationForm = z.object({
+  token: z.string(),
+});
+
+export type TEnableTwoFactorAuthenticationForm = z.infer<typeof ZEnableTwoFactorAuthenticationForm>;
+
+export type EnableAuthenticatorAppDialogProps = {
+  open: boolean;
+  onOpenChange: (_open: boolean) => void;
+};
+
+export const EnableAuthenticatorAppDialog = ({
+  open,
+  onOpenChange,
+}: EnableAuthenticatorAppDialogProps) => {
+  const router = useRouter();
+  const { toast } = useToast();
+
+  const { mutateAsync: setupTwoFactorAuthentication, data: setupTwoFactorAuthenticationData } =
+    trpc.twoFactorAuthentication.setup.useMutation();
+
+  const { mutateAsync: enableTwoFactorAuthentication, data: enableTwoFactorAuthenticationData } =
+    trpc.twoFactorAuthentication.enable.useMutation();
+
+  const setupTwoFactorAuthenticationForm = useForm<TSetupTwoFactorAuthenticationForm>({
+    defaultValues: {
+      password: '',
+    },
+    resolver: zodResolver(ZSetupTwoFactorAuthenticationForm),
+  });
+
+  const { isSubmitting: isSetupTwoFactorAuthenticationSubmitting } =
+    setupTwoFactorAuthenticationForm.formState;
+
+  const enableTwoFactorAuthenticationForm = useForm<TEnableTwoFactorAuthenticationForm>({
+    defaultValues: {
+      token: '',
+    },
+    resolver: zodResolver(ZEnableTwoFactorAuthenticationForm),
+  });
+
+  const { isSubmitting: isEnableTwoFactorAuthenticationSubmitting } =
+    enableTwoFactorAuthenticationForm.formState;
+
+  const step = useMemo(() => {
+    if (!setupTwoFactorAuthenticationData || isSetupTwoFactorAuthenticationSubmitting) {
+      return 'setup';
+    }
+
+    if (!enableTwoFactorAuthenticationData || isEnableTwoFactorAuthenticationSubmitting) {
+      return 'enable';
+    }
+
+    return 'view';
+  }, [
+    setupTwoFactorAuthenticationData,
+    isSetupTwoFactorAuthenticationSubmitting,
+    enableTwoFactorAuthenticationData,
+    isEnableTwoFactorAuthenticationSubmitting,
+  ]);
+
+  const onSetupTwoFactorAuthenticationFormSubmit = async ({
+    password,
+  }: TSetupTwoFactorAuthenticationForm) => {
+    try {
+      await setupTwoFactorAuthentication({ password });
+    } catch (_err) {
+      toast({
+        title: 'Unable to setup two-factor authentication',
+        description:
+          'We were unable to setup two-factor authentication for your account. Please ensure that you have entered your password correctly and try again.',
+        variant: 'destructive',
+      });
+    }
+  };
+
+  const onEnableTwoFactorAuthenticationFormSubmit = async ({
+    token,
+  }: TEnableTwoFactorAuthenticationForm) => {
+    try {
+      await enableTwoFactorAuthentication({ code: token });
+
+      toast({
+        title: 'Two-factor authentication enabled',
+        description:
+          'Two-factor authentication has been enabled for your account. You will now be required to enter a code from your authenticator app when signing in.',
+      });
+    } catch (_err) {
+      toast({
+        title: 'Unable to setup two-factor authentication',
+        description:
+          'We were unable to setup two-factor authentication for your account. Please ensure that you have entered your password correctly and try again.',
+        variant: 'destructive',
+      });
+    }
+  };
+
+  const onCompleteClick = () => {
+    flushSync(() => {
+      onOpenChange(false);
+    });
+
+    router.refresh();
+  };
+
+  return (
+    <Dialog open={open} onOpenChange={onOpenChange}>
+      <DialogContent className="w-full max-w-xl md:max-w-xl lg:max-w-xl">
+        <DialogHeader>
+          <DialogTitle>Enable Authenticator App</DialogTitle>
+
+          {step === 'setup' && (
+            <DialogDescription>
+              To enable two-factor authentication, please enter your password below.
+            </DialogDescription>
+          )}
+
+          {step === 'view' && (
+            <DialogDescription>
+              Your recovery codes are listed below. Please store them in a safe place.
+            </DialogDescription>
+          )}
+        </DialogHeader>
+
+        {match(step)
+          .with('setup', () => {
+            return (
+              <Form {...setupTwoFactorAuthenticationForm}>
+                <form
+                  onSubmit={setupTwoFactorAuthenticationForm.handleSubmit(
+                    onSetupTwoFactorAuthenticationFormSubmit,
+                  )}
+                  className="flex flex-col gap-y-4"
+                >
+                  <FormField
+                    name="password"
+                    control={setupTwoFactorAuthenticationForm.control}
+                    render={({ field }) => (
+                      <FormItem>
+                        <FormLabel className="text-muted-foreground">Password</FormLabel>
+                        <FormControl>
+                          <Input
+                            {...field}
+                            type="password"
+                            autoComplete="current-password"
+                            value={field.value ?? ''}
+                          />
+                        </FormControl>
+                        <FormMessage />
+                      </FormItem>
+                    )}
+                  />
+
+                  <div className="flex w-full items-center justify-between">
+                    <Button type="button" variant="ghost" onClick={() => onOpenChange(false)}>
+                      Cancel
+                    </Button>
+
+                    <Button type="submit" loading={isSetupTwoFactorAuthenticationSubmitting}>
+                      Continue
+                    </Button>
+                  </div>
+                </form>
+              </Form>
+            );
+          })
+          .with('enable', () => (
+            <Form {...enableTwoFactorAuthenticationForm}>
+              <form
+                onSubmit={enableTwoFactorAuthenticationForm.handleSubmit(
+                  onEnableTwoFactorAuthenticationFormSubmit,
+                )}
+                className="flex flex-col gap-y-4"
+              >
+                <p className="text-muted-foreground text-sm">
+                  To enable two-factor authentication, scan the following QR code using your
+                  authenticator app.
+                </p>
+
+                <div
+                  className="flex h-36 justify-center"
+                  dangerouslySetInnerHTML={{
+                    __html: renderSVG(setupTwoFactorAuthenticationData?.uri ?? ''),
+                  }}
+                />
+
+                <p className="text-muted-foreground text-sm">
+                  If your authenticator app does not support QR codes, you can use the following
+                  code instead:
+                </p>
+
+                <p className="bg-muted/60 text-muted-foreground rounded-lg p-2 text-center font-mono tracking-widest">
+                  {setupTwoFactorAuthenticationData?.secret}
+                </p>
+
+                <p className="text-muted-foreground text-sm">
+                  Once you have scanned the QR code or entered the code manually, enter the code
+                  provided by your authenticator app below.
+                </p>
+
+                <FormField
+                  name="token"
+                  control={enableTwoFactorAuthenticationForm.control}
+                  render={({ field }) => (
+                    <FormItem>
+                      <FormLabel className="text-muted-foreground">Token</FormLabel>
+                      <FormControl>
+                        <Input {...field} type="text" value={field.value ?? ''} />
+                      </FormControl>
+                      <FormMessage />
+                    </FormItem>
+                  )}
+                />
+
+                <div className="flex w-full items-center justify-between">
+                  <Button type="button" variant="ghost" onClick={() => onOpenChange(false)}>
+                    Cancel
+                  </Button>
+
+                  <Button type="submit" loading={isEnableTwoFactorAuthenticationSubmitting}>
+                    Enable 2FA
+                  </Button>
+                </div>
+              </form>
+            </Form>
+          ))
+          .with('view', () => (
+            <div>
+              {enableTwoFactorAuthenticationData?.recoveryCodes && (
+                <RecoveryCodeList recoveryCodes={enableTwoFactorAuthenticationData.recoveryCodes} />
+              )}
+
+              <div className="mt-4 flex w-full flex-row-reverse items-center justify-between">
+                <Button type="button" onClick={() => onCompleteClick()}>
+                  Complete
+                </Button>
+              </div>
+            </div>
+          ))
+          .exhaustive()}
+      </DialogContent>
+    </Dialog>
+  );
+};
diff --git a/apps/web/src/components/forms/2fa/recovery-code-list.tsx b/apps/web/src/components/forms/2fa/recovery-code-list.tsx
new file mode 100644
index 000000000..d2efb0b4b
--- /dev/null
+++ b/apps/web/src/components/forms/2fa/recovery-code-list.tsx
@@ -0,0 +1,57 @@
+import { Copy } from 'lucide-react';
+
+import { useCopyToClipboard } from '@documenso/lib/client-only/hooks/use-copy-to-clipboard';
+import { useToast } from '@documenso/ui/primitives/use-toast';
+
+export type RecoveryCodeListProps = {
+  recoveryCodes: string[];
+};
+
+export const RecoveryCodeList = ({ recoveryCodes }: RecoveryCodeListProps) => {
+  const { toast } = useToast();
+  const [, copyToClipboard] = useCopyToClipboard();
+
+  const onCopyRecoveryCodeClick = async (code: string) => {
+    try {
+      const result = await copyToClipboard(code);
+
+      if (!result) {
+        throw new Error('Unable to copy recovery code');
+      }
+
+      toast({
+        title: 'Recovery code copied',
+        description: 'Your recovery code has been copied to your clipboard.',
+      });
+    } catch (_err) {
+      toast({
+        title: 'Unable to copy recovery code',
+        description:
+          'We were unable to copy your recovery code to your clipboard. Please try again.',
+        variant: 'destructive',
+      });
+    }
+  };
+
+  return (
+    <div className="grid grid-cols-2 gap-4">
+      {recoveryCodes.map((code) => (
+        <div
+          key={code}
+          className="bg-muted text-muted-foreground relative rounded-lg p-4 font-mono md:text-center"
+        >
+          <span>{code}</span>
+
+          <div className="absolute inset-y-0 right-4 flex items-center justify-center">
+            <button
+              className="opacity-60 hover:opacity-80"
+              onClick={() => void onCopyRecoveryCodeClick(code)}
+            >
+              <Copy className="h-5 w-5" />
+            </button>
+          </div>
+        </div>
+      ))}
+    </div>
+  );
+};
diff --git a/apps/web/src/components/forms/2fa/recovery-codes.tsx b/apps/web/src/components/forms/2fa/recovery-codes.tsx
new file mode 100644
index 000000000..7e8950227
--- /dev/null
+++ b/apps/web/src/components/forms/2fa/recovery-codes.tsx
@@ -0,0 +1,43 @@
+'use client';
+
+import { useState } from 'react';
+
+import { Button } from '@documenso/ui/primitives/button';
+
+import { ViewRecoveryCodesDialog } from './view-recovery-codes-dialog';
+
+type RecoveryCodesProps = {
+  // backupCodes: string[] | null;
+  isTwoFactorEnabled: boolean;
+};
+
+export const RecoveryCodes = ({ isTwoFactorEnabled }: RecoveryCodesProps) => {
+  const [isOpen, setIsOpen] = useState(false);
+
+  return (
+    <>
+      <div className="mt-4 flex flex-col justify-between gap-4 rounded-lg border p-4 md:flex-row md:items-center md:gap-8">
+        <div className="flex-1">
+          <p>Recovery Codes</p>
+
+          <p className="text-muted-foreground mt-2 max-w-[50ch] text-sm">
+            Recovery codes are used to access your account in the event that you lose access to your
+            authenticator app.
+          </p>
+        </div>
+
+        <div>
+          <Button onClick={() => setIsOpen(true)} disabled={!isTwoFactorEnabled} size="sm">
+            View Codes
+          </Button>
+        </div>
+      </div>
+
+      <ViewRecoveryCodesDialog
+        key={isOpen ? 'open' : 'closed'}
+        open={isOpen}
+        onOpenChange={setIsOpen}
+      />
+    </>
+  );
+};
diff --git a/apps/web/src/components/forms/2fa/view-recovery-codes-dialog.tsx b/apps/web/src/components/forms/2fa/view-recovery-codes-dialog.tsx
new file mode 100644
index 000000000..6275f16d6
--- /dev/null
+++ b/apps/web/src/components/forms/2fa/view-recovery-codes-dialog.tsx
@@ -0,0 +1,151 @@
+import { useMemo } from 'react';
+
+import { zodResolver } from '@hookform/resolvers/zod';
+import { useForm } from 'react-hook-form';
+import { match } from 'ts-pattern';
+import { z } from 'zod';
+
+import { trpc } from '@documenso/trpc/react';
+import { Button } from '@documenso/ui/primitives/button';
+import {
+  Dialog,
+  DialogContent,
+  DialogDescription,
+  DialogHeader,
+  DialogTitle,
+} from '@documenso/ui/primitives/dialog';
+import {
+  Form,
+  FormControl,
+  FormField,
+  FormItem,
+  FormLabel,
+  FormMessage,
+} from '@documenso/ui/primitives/form/form';
+import { Input } from '@documenso/ui/primitives/input';
+import { useToast } from '@documenso/ui/primitives/use-toast';
+
+import { RecoveryCodeList } from './recovery-code-list';
+
+export const ZViewRecoveryCodesForm = z.object({
+  password: z.string().min(6).max(72),
+});
+
+export type TViewRecoveryCodesForm = z.infer<typeof ZViewRecoveryCodesForm>;
+
+export type ViewRecoveryCodesDialogProps = {
+  open: boolean;
+  onOpenChange: (_open: boolean) => void;
+};
+
+export const ViewRecoveryCodesDialog = ({ open, onOpenChange }: ViewRecoveryCodesDialogProps) => {
+  const { toast } = useToast();
+
+  const { mutateAsync: viewRecoveryCodes, data: viewRecoveryCodesData } =
+    trpc.twoFactorAuthentication.viewRecoveryCodes.useMutation();
+
+  const viewRecoveryCodesForm = useForm<TViewRecoveryCodesForm>({
+    defaultValues: {
+      password: '',
+    },
+    resolver: zodResolver(ZViewRecoveryCodesForm),
+  });
+
+  const { isSubmitting: isViewRecoveryCodesSubmitting } = viewRecoveryCodesForm.formState;
+
+  const step = useMemo(() => {
+    if (!viewRecoveryCodesData || isViewRecoveryCodesSubmitting) {
+      return 'authenticate';
+    }
+
+    return 'view';
+  }, [viewRecoveryCodesData, isViewRecoveryCodesSubmitting]);
+
+  const onViewRecoveryCodesFormSubmit = async ({ password }: TViewRecoveryCodesForm) => {
+    try {
+      await viewRecoveryCodes({ password });
+    } catch (_err) {
+      toast({
+        title: 'Unable to view recovery codes',
+        description:
+          'We were unable to view your recovery codes. Please ensure that you have entered your password correctly and try again.',
+        variant: 'destructive',
+      });
+    }
+  };
+
+  return (
+    <Dialog open={open} onOpenChange={onOpenChange}>
+      <DialogContent className="w-full max-w-xl md:max-w-xl lg:max-w-xl">
+        <DialogHeader>
+          <DialogTitle>View Recovery Codes</DialogTitle>
+
+          {step === 'authenticate' && (
+            <DialogDescription>
+              To view your recovery codes, please enter your password below.
+            </DialogDescription>
+          )}
+
+          {step === 'view' && (
+            <DialogDescription>
+              Your recovery codes are listed below. Please store them in a safe place.
+            </DialogDescription>
+          )}
+        </DialogHeader>
+
+        {match(step)
+          .with('authenticate', () => {
+            return (
+              <Form {...viewRecoveryCodesForm}>
+                <form
+                  onSubmit={viewRecoveryCodesForm.handleSubmit(onViewRecoveryCodesFormSubmit)}
+                  className="flex flex-col gap-y-4"
+                >
+                  <FormField
+                    name="password"
+                    control={viewRecoveryCodesForm.control}
+                    render={({ field }) => (
+                      <FormItem>
+                        <FormLabel className="text-muted-foreground">Password</FormLabel>
+                        <FormControl>
+                          <Input
+                            {...field}
+                            type="password"
+                            autoComplete="current-password"
+                            value={field.value ?? ''}
+                          />
+                        </FormControl>
+                        <FormMessage />
+                      </FormItem>
+                    )}
+                  />
+
+                  <div className="flex w-full items-center justify-between">
+                    <Button type="button" variant="ghost" onClick={() => onOpenChange(false)}>
+                      Cancel
+                    </Button>
+
+                    <Button type="submit" loading={isViewRecoveryCodesSubmitting}>
+                      Continue
+                    </Button>
+                  </div>
+                </form>
+              </Form>
+            );
+          })
+          .with('view', () => (
+            <div>
+              {viewRecoveryCodesData?.recoveryCodes && (
+                <RecoveryCodeList recoveryCodes={viewRecoveryCodesData.recoveryCodes} />
+              )}
+
+              <div className="mt-4 flex flex-row-reverse items-center justify-between">
+                <Button onClick={() => onOpenChange(false)}>Complete</Button>
+              </div>
+            </div>
+          ))
+          .exhaustive()}
+      </DialogContent>
+    </Dialog>
+  );
+};
diff --git a/apps/web/src/components/forms/signin.tsx b/apps/web/src/components/forms/signin.tsx
index abdc1efe6..0d7dd723f 100644
--- a/apps/web/src/components/forms/signin.tsx
+++ b/apps/web/src/components/forms/signin.tsx
@@ -3,7 +3,6 @@
 import { useState } from 'react';
 
 import { zodResolver } from '@hookform/resolvers/zod';
-import { Eye, EyeOff } from 'lucide-react';
 import { signIn } from 'next-auth/react';
 import { useForm } from 'react-hook-form';
 import { FcGoogle } from 'react-icons/fc';
@@ -12,23 +11,30 @@ import { z } from 'zod';
 import { ErrorCode, isErrorCode } from '@documenso/lib/next-auth/error-codes';
 import { cn } from '@documenso/ui/lib/utils';
 import { Button } from '@documenso/ui/primitives/button';
+import { Dialog, DialogContent, DialogHeader, DialogTitle } from '@documenso/ui/primitives/dialog';
 import { FormErrorMessage } from '@documenso/ui/primitives/form/form-error-message';
-import { Input } from '@documenso/ui/primitives/input';
+import { Input, PasswordInput } from '@documenso/ui/primitives/input';
 import { Label } from '@documenso/ui/primitives/label';
 import { useToast } from '@documenso/ui/primitives/use-toast';
 
-const ERROR_MESSAGES = {
+const ERROR_MESSAGES: Partial<Record<keyof typeof ErrorCode, string>> = {
   [ErrorCode.CREDENTIALS_NOT_FOUND]: 'The email or password provided is incorrect',
   [ErrorCode.INCORRECT_EMAIL_PASSWORD]: 'The email or password provided is incorrect',
   [ErrorCode.USER_MISSING_PASSWORD]:
     'This account appears to be using a social login method, please sign in using that method',
+  [ErrorCode.INCORRECT_TWO_FACTOR_CODE]: 'The two-factor authentication code provided is incorrect',
+  [ErrorCode.INCORRECT_TWO_FACTOR_BACKUP_CODE]: 'The backup code provided is incorrect',
 };
 
+const TwoFactorEnabledErrorCode = ErrorCode.TWO_FACTOR_MISSING_CREDENTIALS;
+
 const LOGIN_REDIRECT_PATH = '/documents';
 
 export const ZSignInFormSchema = z.object({
   email: z.string().email().min(1),
-  password: z.string().min(6, { message: 'Invalid password' }).max(72),
+  password: z.string().min(6).max(72),
+  totpCode: z.string().trim().optional(),
+  backupCode: z.string().trim().optional(),
 });
 
 export type TSignInFormSchema = z.infer<typeof ZSignInFormSchema>;
@@ -39,33 +45,84 @@ export type SignInFormProps = {
 
 export const SignInForm = ({ className }: SignInFormProps) => {
   const { toast } = useToast();
-  const [showPassword, setShowPassword] = useState(false);
+  const [isTwoFactorAuthenticationDialogOpen, setIsTwoFactorAuthenticationDialogOpen] =
+    useState(false);
+
+  const [twoFactorAuthenticationMethod, setTwoFactorAuthenticationMethod] = useState<
+    'totp' | 'backup'
+  >('totp');
 
   const {
     register,
     handleSubmit,
+    setValue,
     formState: { errors, isSubmitting },
   } = useForm<TSignInFormSchema>({
     values: {
       email: '',
       password: '',
+      totpCode: '',
+      backupCode: '',
     },
     resolver: zodResolver(ZSignInFormSchema),
   });
 
-  const onFormSubmit = async ({ email, password }: TSignInFormSchema) => {
+  const onCloseTwoFactorAuthenticationDialog = () => {
+    setValue('totpCode', '');
+    setValue('backupCode', '');
+
+    setIsTwoFactorAuthenticationDialogOpen(false);
+  };
+
+  const onToggleTwoFactorAuthenticationMethodClick = () => {
+    const method = twoFactorAuthenticationMethod === 'totp' ? 'backup' : 'totp';
+
+    if (method === 'totp') {
+      setValue('backupCode', '');
+    }
+
+    if (method === 'backup') {
+      setValue('totpCode', '');
+    }
+
+    setTwoFactorAuthenticationMethod(method);
+  };
+
+  const onFormSubmit = async ({ email, password, totpCode, backupCode }: TSignInFormSchema) => {
     try {
-      const result = await signIn('credentials', {
+      const credentials: Record<string, string> = {
         email,
         password,
+      };
+
+      if (totpCode) {
+        credentials.totpCode = totpCode;
+      }
+
+      if (backupCode) {
+        credentials.backupCode = backupCode;
+      }
+
+      const result = await signIn('credentials', {
+        ...credentials,
+
         callbackUrl: LOGIN_REDIRECT_PATH,
         redirect: false,
       });
 
       if (result?.error && isErrorCode(result.error)) {
+        if (result.error === TwoFactorEnabledErrorCode) {
+          setIsTwoFactorAuthenticationDialogOpen(true);
+
+          return;
+        }
+
+        const errorMessage = ERROR_MESSAGES[result.error];
+
         toast({
           variant: 'destructive',
-          description: ERROR_MESSAGES[result.error],
+          title: 'Unable to sign in',
+          description: errorMessage ?? 'An unknown error occurred',
         });
 
         return;
@@ -118,31 +175,14 @@ export const SignInForm = ({ className }: SignInFormProps) => {
           <span>Password</span>
         </Label>
 
-        <div className="relative">
-          <Input
-            id="password"
-            type={showPassword ? 'text' : 'password'}
-            minLength={6}
-            maxLength={72}
-            autoComplete="current-password"
-            className="bg-background mt-2 pr-10"
-            {...register('password')}
-          />
-
-          <Button
-            variant="link"
-            type="button"
-            className="absolute right-0 top-0 flex h-full items-center justify-center pr-3"
-            aria-label={showPassword ? 'Mask password' : 'Reveal password'}
-            onClick={() => setShowPassword((show) => !show)}
-          >
-            {showPassword ? (
-              <EyeOff className="text-muted-foreground h-5 w-5" />
-            ) : (
-              <Eye className="text-muted-foreground h-5 w-5" />
-            )}
-          </Button>
-        </div>
+        <PasswordInput
+          id="password"
+          minLength={6}
+          maxLength={72}
+          className="bg-background mt-2"
+          autoComplete="current-password"
+          {...register('password')}
+        />
 
         <FormErrorMessage className="mt-1.5" error={errors.password} />
       </div>
@@ -173,6 +213,67 @@ export const SignInForm = ({ className }: SignInFormProps) => {
         <FcGoogle className="mr-2 h-5 w-5" />
         Google
       </Button>
+
+      <Dialog
+        open={isTwoFactorAuthenticationDialogOpen}
+        onOpenChange={onCloseTwoFactorAuthenticationDialog}
+      >
+        <DialogContent>
+          <DialogHeader>
+            <DialogTitle>Two-Factor Authentication</DialogTitle>
+          </DialogHeader>
+
+          <form onSubmit={handleSubmit(onFormSubmit)}>
+            {twoFactorAuthenticationMethod === 'totp' && (
+              <div>
+                <Label htmlFor="totpCode" className="text-muted-forground">
+                  Authentication Token
+                </Label>
+
+                <Input
+                  id="totpCode"
+                  type="text"
+                  className="bg-background mt-2"
+                  {...register('totpCode')}
+                />
+
+                <FormErrorMessage className="mt-1.5" error={errors.totpCode} />
+              </div>
+            )}
+
+            {twoFactorAuthenticationMethod === 'backup' && (
+              <div>
+                <Label htmlFor="backupCode" className="text-muted-forground">
+                  Backup Code
+                </Label>
+
+                <Input
+                  id="backupCode"
+                  type="text"
+                  className="bg-background mt-2"
+                  {...register('backupCode')}
+                />
+
+                <FormErrorMessage className="mt-1.5" error={errors.backupCode} />
+              </div>
+            )}
+
+            <div className="mt-4 flex items-center justify-between">
+              <Button
+                type="button"
+                variant="ghost"
+                onClick={onToggleTwoFactorAuthenticationMethodClick}
+              >
+                {twoFactorAuthenticationMethod === 'totp' ? 'Use Backup Code' : 'Use Authenticator'}
+              </Button>
+
+              <Button type="submit" loading={isSubmitting}>
+                Sign In
+              </Button>
+            </div>
+          </form>
+        </DialogContent>
+      </Dialog>
     </form>
   );
 };
diff --git a/package-lock.json b/package-lock.json
index 6f5a6d6a9..56d332429 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -111,6 +111,7 @@
         "sharp": "0.32.5",
         "ts-pattern": "^5.0.5",
         "typescript": "5.2.2",
+        "uqr": "^0.1.2",
         "zod": "^3.22.4"
       },
       "devDependencies": {
@@ -2860,6 +2861,465 @@
         "node": ">= 10"
       }
     },
+    "node_modules/@noble/ciphers": {
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/@noble/ciphers/-/ciphers-0.4.0.tgz",
+      "integrity": "sha512-xaUaUUDWbHIFSxaQ/pIe+33VG2mfJp6N/KxKLmZr5biWdNznCAmfu24QRhX10BbVAuqOahAoyp0S4M9md6GPDw==",
+      "funding": {
+        "url": "https://paulmillr.com/funding/"
+      }
+    },
+    "node_modules/@noble/hashes": {
+      "version": "1.3.2",
+      "resolved": "https://registry.npmjs.org/@noble/hashes/-/hashes-1.3.2.tgz",
+      "integrity": "sha512-MVC8EAQp7MvEcm30KWENFjgR+Mkmf+D189XJTkFIlwohU5hcBbn1ZkKq7KVTi2Hme3PMGF390DaL52beVrIihQ==",
+      "engines": {
+        "node": ">= 16"
+      },
+      "funding": {
+        "url": "https://paulmillr.com/funding/"
+      }
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     "node_modules/uri-js": {
       "version": "4.4.1",
       "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.4.1.tgz",
@@ -19781,6 +20255,8 @@
         "@documenso/prisma": "*",
         "@documenso/signing": "*",
         "@next-auth/prisma-adapter": "1.0.7",
+        "@noble/ciphers": "0.4.0",
+        "@noble/hashes": "1.3.2",
         "@pdf-lib/fontkit": "^1.1.1",
         "@scure/base": "^1.1.3",
         "@sindresorhus/slugify": "^2.2.1",
@@ -19790,6 +20266,7 @@
         "nanoid": "^4.0.2",
         "next": "14.0.0",
         "next-auth": "4.24.3",
+        "oslo": "^0.17.0",
         "pdf-lib": "^1.17.1",
         "react": "18.2.0",
         "remeda": "^1.27.1",
@@ -19891,7 +20368,8 @@
         "superjson": "^1.13.1",
         "ts-pattern": "^5.0.5",
         "zod": "^3.22.4"
-      }
+      },
+      "devDependencies": {}
     },
     "packages/tsconfig": {
       "name": "@documenso/tsconfig",
diff --git a/packages/lib/constants/crypto.ts b/packages/lib/constants/crypto.ts
new file mode 100644
index 000000000..d911cd6cf
--- /dev/null
+++ b/packages/lib/constants/crypto.ts
@@ -0,0 +1 @@
+export const DOCUMENSO_ENCRYPTION_KEY = process.env.NEXT_PRIVATE_ENCRYPTION_KEY;
diff --git a/packages/lib/next-auth/auth-options.ts b/packages/lib/next-auth/auth-options.ts
index 57a37d7fe..6d59b0666 100644
--- a/packages/lib/next-auth/auth-options.ts
+++ b/packages/lib/next-auth/auth-options.ts
@@ -10,6 +10,8 @@ import GoogleProvider from 'next-auth/providers/google';
 
 import { prisma } from '@documenso/prisma';
 
+import { isTwoFactorAuthenticationEnabled } from '../server-only/2fa/is-2fa-availble';
+import { validateTwoFactorAuthentication } from '../server-only/2fa/validate-2fa';
 import { getUserByEmail } from '../server-only/user/get-user-by-email';
 import { ErrorCode } from './error-codes';
 
@@ -25,13 +27,19 @@ export const NEXT_AUTH_OPTIONS: AuthOptions = {
       credentials: {
         email: { label: 'Email', type: 'email' },
         password: { label: 'Password', type: 'password' },
+        totpCode: {
+          label: 'Two-factor Code',
+          type: 'input',
+          placeholder: 'Code from authenticator app',
+        },
+        backupCode: { label: 'Backup Code', type: 'input', placeholder: 'Two-factor backup code' },
       },
       authorize: async (credentials, _req) => {
         if (!credentials) {
           throw new Error(ErrorCode.CREDENTIALS_NOT_FOUND);
         }
 
-        const { email, password } = credentials;
+        const { email, password, backupCode, totpCode } = credentials;
 
         const user = await getUserByEmail({ email }).catch(() => {
           throw new Error(ErrorCode.INCORRECT_EMAIL_PASSWORD);
@@ -47,6 +55,20 @@ export const NEXT_AUTH_OPTIONS: AuthOptions = {
           throw new Error(ErrorCode.INCORRECT_EMAIL_PASSWORD);
         }
 
+        const is2faEnabled = isTwoFactorAuthenticationEnabled({ user });
+
+        if (is2faEnabled) {
+          const isValid = await validateTwoFactorAuthentication({ backupCode, totpCode, user });
+
+          if (!isValid) {
+            throw new Error(
+              totpCode
+                ? ErrorCode.INCORRECT_TWO_FACTOR_CODE
+                : ErrorCode.INCORRECT_TWO_FACTOR_BACKUP_CODE,
+            );
+          }
+        }
+
         return {
           id: Number(user.id),
           email: user.email,
diff --git a/packages/lib/next-auth/error-codes.ts b/packages/lib/next-auth/error-codes.ts
index 26e8f5b97..c3dfafece 100644
--- a/packages/lib/next-auth/error-codes.ts
+++ b/packages/lib/next-auth/error-codes.ts
@@ -8,4 +8,15 @@ export const ErrorCode = {
   INCORRECT_EMAIL_PASSWORD: 'INCORRECT_EMAIL_PASSWORD',
   USER_MISSING_PASSWORD: 'USER_MISSING_PASSWORD',
   CREDENTIALS_NOT_FOUND: 'CREDENTIALS_NOT_FOUND',
+  INTERNAL_SEVER_ERROR: 'INTERNAL_SEVER_ERROR',
+  TWO_FACTOR_ALREADY_ENABLED: 'TWO_FACTOR_ALREADY_ENABLED',
+  TWO_FACTOR_SETUP_REQUIRED: 'TWO_FACTOR_SETUP_REQUIRED',
+  TWO_FACTOR_MISSING_SECRET: 'TWO_FACTOR_MISSING_SECRET',
+  TWO_FACTOR_MISSING_CREDENTIALS: 'TWO_FACTOR_MISSING_CREDENTIALS',
+  INCORRECT_TWO_FACTOR_CODE: 'INCORRECT_TWO_FACTOR_CODE',
+  INCORRECT_TWO_FACTOR_BACKUP_CODE: 'INCORRECT_TWO_FACTOR_BACKUP_CODE',
+  INCORRECT_IDENTITY_PROVIDER: 'INCORRECT_IDENTITY_PROVIDER',
+  INCORRECT_PASSWORD: 'INCORRECT_PASSWORD',
+  MISSING_ENCRYPTION_KEY: 'MISSING_ENCRYPTION_KEY',
+  MISSING_BACKUP_CODE: 'MISSING_BACKUP_CODE',
 } as const;
diff --git a/packages/lib/package.json b/packages/lib/package.json
index 56be5a7f0..e9d321e5b 100644
--- a/packages/lib/package.json
+++ b/packages/lib/package.json
@@ -25,6 +25,8 @@
     "@documenso/prisma": "*",
     "@documenso/signing": "*",
     "@next-auth/prisma-adapter": "1.0.7",
+    "@noble/ciphers": "0.4.0",
+    "@noble/hashes": "1.3.2",
     "@pdf-lib/fontkit": "^1.1.1",
     "@scure/base": "^1.1.3",
     "@sindresorhus/slugify": "^2.2.1",
@@ -34,6 +36,7 @@
     "nanoid": "^4.0.2",
     "next": "14.0.0",
     "next-auth": "4.24.3",
+    "oslo": "^0.17.0",
     "pdf-lib": "^1.17.1",
     "react": "18.2.0",
     "remeda": "^1.27.1",
diff --git a/packages/lib/server-only/2fa/disable-2fa.ts b/packages/lib/server-only/2fa/disable-2fa.ts
new file mode 100644
index 000000000..5b27d5c9d
--- /dev/null
+++ b/packages/lib/server-only/2fa/disable-2fa.ts
@@ -0,0 +1,48 @@
+import { compare } from 'bcrypt';
+
+import { prisma } from '@documenso/prisma';
+import { User } from '@documenso/prisma/client';
+
+import { ErrorCode } from '../../next-auth/error-codes';
+import { validateTwoFactorAuthentication } from './validate-2fa';
+
+type DisableTwoFactorAuthenticationOptions = {
+  user: User;
+  backupCode: string;
+  password: string;
+};
+
+export const disableTwoFactorAuthentication = async ({
+  backupCode,
+  user,
+  password,
+}: DisableTwoFactorAuthenticationOptions) => {
+  if (!user.password) {
+    throw new Error(ErrorCode.USER_MISSING_PASSWORD);
+  }
+
+  const isCorrectPassword = await compare(password, user.password);
+
+  if (!isCorrectPassword) {
+    throw new Error(ErrorCode.INCORRECT_PASSWORD);
+  }
+
+  const isValid = await validateTwoFactorAuthentication({ backupCode, user });
+
+  if (!isValid) {
+    throw new Error(ErrorCode.INCORRECT_TWO_FACTOR_BACKUP_CODE);
+  }
+
+  await prisma.user.update({
+    where: {
+      id: user.id,
+    },
+    data: {
+      twoFactorEnabled: false,
+      twoFactorBackupCodes: null,
+      twoFactorSecret: null,
+    },
+  });
+
+  return true;
+};
diff --git a/packages/lib/server-only/2fa/enable-2fa.ts b/packages/lib/server-only/2fa/enable-2fa.ts
new file mode 100644
index 000000000..9f61e52a4
--- /dev/null
+++ b/packages/lib/server-only/2fa/enable-2fa.ts
@@ -0,0 +1,47 @@
+import { ErrorCode } from '@documenso/lib/next-auth/error-codes';
+import { prisma } from '@documenso/prisma';
+import { User } from '@documenso/prisma/client';
+
+import { getBackupCodes } from './get-backup-code';
+import { verifyTwoFactorAuthenticationToken } from './verify-2fa-token';
+
+type EnableTwoFactorAuthenticationOptions = {
+  user: User;
+  code: string;
+};
+
+export const enableTwoFactorAuthentication = async ({
+  user,
+  code,
+}: EnableTwoFactorAuthenticationOptions) => {
+  if (user.identityProvider !== 'DOCUMENSO') {
+    throw new Error(ErrorCode.INCORRECT_IDENTITY_PROVIDER);
+  }
+
+  if (user.twoFactorEnabled) {
+    throw new Error(ErrorCode.TWO_FACTOR_ALREADY_ENABLED);
+  }
+
+  if (!user.twoFactorSecret) {
+    throw new Error(ErrorCode.TWO_FACTOR_SETUP_REQUIRED);
+  }
+
+  const isValidToken = await verifyTwoFactorAuthenticationToken({ user, totpCode: code });
+
+  if (!isValidToken) {
+    throw new Error(ErrorCode.INCORRECT_TWO_FACTOR_CODE);
+  }
+
+  const updatedUser = await prisma.user.update({
+    where: {
+      id: user.id,
+    },
+    data: {
+      twoFactorEnabled: true,
+    },
+  });
+
+  const recoveryCodes = getBackupCodes({ user: updatedUser });
+
+  return { recoveryCodes };
+};
diff --git a/packages/lib/server-only/2fa/get-backup-code.ts b/packages/lib/server-only/2fa/get-backup-code.ts
new file mode 100644
index 000000000..e1188f37a
--- /dev/null
+++ b/packages/lib/server-only/2fa/get-backup-code.ts
@@ -0,0 +1,38 @@
+import { z } from 'zod';
+
+import { User } from '@documenso/prisma/client';
+
+import { DOCUMENSO_ENCRYPTION_KEY } from '../../constants/crypto';
+import { symmetricDecrypt } from '../../universal/crypto';
+
+interface GetBackupCodesOptions {
+  user: User;
+}
+
+const ZBackupCodeSchema = z.array(z.string());
+
+export const getBackupCodes = ({ user }: GetBackupCodesOptions) => {
+  const key = DOCUMENSO_ENCRYPTION_KEY;
+
+  if (!user.twoFactorEnabled) {
+    throw new Error('User has not enabled 2FA');
+  }
+
+  if (!user.twoFactorBackupCodes) {
+    throw new Error('User has no backup codes');
+  }
+
+  const secret = Buffer.from(symmetricDecrypt({ key, data: user.twoFactorBackupCodes })).toString(
+    'utf-8',
+  );
+
+  const data = JSON.parse(secret);
+
+  const result = ZBackupCodeSchema.safeParse(data);
+
+  if (result.success) {
+    return result.data;
+  }
+
+  return null;
+};
diff --git a/packages/lib/server-only/2fa/is-2fa-availble.ts b/packages/lib/server-only/2fa/is-2fa-availble.ts
new file mode 100644
index 000000000..d06a0085d
--- /dev/null
+++ b/packages/lib/server-only/2fa/is-2fa-availble.ts
@@ -0,0 +1,17 @@
+import { User } from '@documenso/prisma/client';
+
+import { DOCUMENSO_ENCRYPTION_KEY } from '../../constants/crypto';
+
+type IsTwoFactorAuthenticationEnabledOptions = {
+  user: User;
+};
+
+export const isTwoFactorAuthenticationEnabled = ({
+  user,
+}: IsTwoFactorAuthenticationEnabledOptions) => {
+  return (
+    user.twoFactorEnabled &&
+    user.identityProvider === 'DOCUMENSO' &&
+    typeof DOCUMENSO_ENCRYPTION_KEY === 'string'
+  );
+};
diff --git a/packages/lib/server-only/2fa/setup-2fa.ts b/packages/lib/server-only/2fa/setup-2fa.ts
new file mode 100644
index 000000000..30ddf0ec3
--- /dev/null
+++ b/packages/lib/server-only/2fa/setup-2fa.ts
@@ -0,0 +1,76 @@
+import { base32 } from '@scure/base';
+import { compare } from 'bcrypt';
+import crypto from 'crypto';
+import { createTOTPKeyURI } from 'oslo/otp';
+
+import { ErrorCode } from '@documenso/lib/next-auth/error-codes';
+import { prisma } from '@documenso/prisma';
+import { User } from '@documenso/prisma/client';
+
+import { DOCUMENSO_ENCRYPTION_KEY } from '../../constants/crypto';
+import { symmetricEncrypt } from '../../universal/crypto';
+
+type SetupTwoFactorAuthenticationOptions = {
+  user: User;
+  password: string;
+};
+
+const ISSUER = 'Documenso';
+
+export const setupTwoFactorAuthentication = async ({
+  user,
+  password,
+}: SetupTwoFactorAuthenticationOptions) => {
+  const key = DOCUMENSO_ENCRYPTION_KEY;
+
+  if (!key) {
+    throw new Error(ErrorCode.MISSING_ENCRYPTION_KEY);
+  }
+
+  if (user.identityProvider !== 'DOCUMENSO') {
+    throw new Error(ErrorCode.INCORRECT_IDENTITY_PROVIDER);
+  }
+
+  if (!user.password) {
+    throw new Error(ErrorCode.USER_MISSING_PASSWORD);
+  }
+
+  const isCorrectPassword = await compare(password, user.password);
+
+  if (!isCorrectPassword) {
+    throw new Error(ErrorCode.INCORRECT_PASSWORD);
+  }
+
+  const secret = crypto.randomBytes(10);
+
+  const backupCodes = new Array(10)
+    .fill(null)
+    .map(() => crypto.randomBytes(5).toString('hex'))
+    .map((code) => `${code.slice(0, 5)}-${code.slice(5)}`.toUpperCase());
+
+  const accountName = user.email;
+  const uri = createTOTPKeyURI(ISSUER, accountName, secret);
+  const encodedSecret = base32.encode(secret);
+
+  await prisma.user.update({
+    where: {
+      id: user.id,
+    },
+    data: {
+      twoFactorEnabled: false,
+      twoFactorBackupCodes: symmetricEncrypt({
+        data: JSON.stringify(backupCodes),
+        key: key,
+      }),
+      twoFactorSecret: symmetricEncrypt({
+        data: encodedSecret,
+        key: key,
+      }),
+    },
+  });
+
+  return {
+    secret: encodedSecret,
+    uri,
+  };
+};
diff --git a/packages/lib/server-only/2fa/validate-2fa.ts b/packages/lib/server-only/2fa/validate-2fa.ts
new file mode 100644
index 000000000..7fc76a8bb
--- /dev/null
+++ b/packages/lib/server-only/2fa/validate-2fa.ts
@@ -0,0 +1,35 @@
+import { User } from '@documenso/prisma/client';
+
+import { ErrorCode } from '../../next-auth/error-codes';
+import { verifyTwoFactorAuthenticationToken } from './verify-2fa-token';
+import { verifyBackupCode } from './verify-backup-code';
+
+type ValidateTwoFactorAuthenticationOptions = {
+  totpCode?: string;
+  backupCode?: string;
+  user: User;
+};
+
+export const validateTwoFactorAuthentication = async ({
+  backupCode,
+  totpCode,
+  user,
+}: ValidateTwoFactorAuthenticationOptions) => {
+  if (!user.twoFactorEnabled) {
+    throw new Error(ErrorCode.TWO_FACTOR_SETUP_REQUIRED);
+  }
+
+  if (!user.twoFactorSecret) {
+    throw new Error(ErrorCode.TWO_FACTOR_MISSING_SECRET);
+  }
+
+  if (totpCode) {
+    return await verifyTwoFactorAuthenticationToken({ user, totpCode });
+  }
+
+  if (backupCode) {
+    return await verifyBackupCode({ user, backupCode });
+  }
+
+  throw new Error(ErrorCode.TWO_FACTOR_MISSING_CREDENTIALS);
+};
diff --git a/packages/lib/server-only/2fa/verify-2fa-token.ts b/packages/lib/server-only/2fa/verify-2fa-token.ts
new file mode 100644
index 000000000..fa9159517
--- /dev/null
+++ b/packages/lib/server-only/2fa/verify-2fa-token.ts
@@ -0,0 +1,33 @@
+import { base32 } from '@scure/base';
+import { TOTPController } from 'oslo/otp';
+
+import { User } from '@documenso/prisma/client';
+
+import { DOCUMENSO_ENCRYPTION_KEY } from '../../constants/crypto';
+import { symmetricDecrypt } from '../../universal/crypto';
+
+const totp = new TOTPController();
+
+type VerifyTwoFactorAuthenticationTokenOptions = {
+  user: User;
+  totpCode: string;
+};
+
+export const verifyTwoFactorAuthenticationToken = async ({
+  user,
+  totpCode,
+}: VerifyTwoFactorAuthenticationTokenOptions) => {
+  const key = DOCUMENSO_ENCRYPTION_KEY;
+
+  if (!user.twoFactorSecret) {
+    throw new Error('user missing 2fa secret');
+  }
+
+  const secret = Buffer.from(symmetricDecrypt({ key, data: user.twoFactorSecret })).toString(
+    'utf-8',
+  );
+
+  const isValidToken = await totp.verify(totpCode, base32.decode(secret));
+
+  return isValidToken;
+};
diff --git a/packages/lib/server-only/2fa/verify-backup-code.ts b/packages/lib/server-only/2fa/verify-backup-code.ts
new file mode 100644
index 000000000..357d4994c
--- /dev/null
+++ b/packages/lib/server-only/2fa/verify-backup-code.ts
@@ -0,0 +1,18 @@
+import { User } from '@documenso/prisma/client';
+
+import { getBackupCodes } from './get-backup-code';
+
+type VerifyBackupCodeParams = {
+  user: User;
+  backupCode: string;
+};
+
+export const verifyBackupCode = async ({ user, backupCode }: VerifyBackupCodeParams) => {
+  const userBackupCodes = await getBackupCodes({ user });
+
+  if (!userBackupCodes) {
+    throw new Error('User has no backup codes');
+  }
+
+  return userBackupCodes.includes(backupCode);
+};
diff --git a/packages/lib/server-only/auth/hash.ts b/packages/lib/server-only/auth/hash.ts
index 1de2ac458..df9931c97 100644
--- a/packages/lib/server-only/auth/hash.ts
+++ b/packages/lib/server-only/auth/hash.ts
@@ -1,4 +1,4 @@
-import { hashSync as bcryptHashSync } from 'bcrypt';
+import { compareSync as bcryptCompareSync, hashSync as bcryptHashSync } from 'bcrypt';
 
 import { SALT_ROUNDS } from '../../constants/auth';
 
@@ -8,3 +8,7 @@ import { SALT_ROUNDS } from '../../constants/auth';
 export const hashSync = (password: string) => {
   return bcryptHashSync(password, SALT_ROUNDS);
 };
+
+export const compareSync = (password: string, hash: string) => {
+  return bcryptCompareSync(password, hash);
+};
diff --git a/packages/lib/universal/crypto.ts b/packages/lib/universal/crypto.ts
new file mode 100644
index 000000000..405208d7f
--- /dev/null
+++ b/packages/lib/universal/crypto.ts
@@ -0,0 +1,32 @@
+import { xchacha20poly1305 } from '@noble/ciphers/chacha';
+import { bytesToHex, hexToBytes, utf8ToBytes } from '@noble/ciphers/utils';
+import { managedNonce } from '@noble/ciphers/webcrypto/utils';
+import { sha256 } from '@noble/hashes/sha256';
+
+export type SymmetricEncryptOptions = {
+  key: string;
+  data: string;
+};
+
+export const symmetricEncrypt = ({ key, data }: SymmetricEncryptOptions) => {
+  const keyAsBytes = sha256(key);
+  const dataAsBytes = utf8ToBytes(data);
+
+  const chacha = managedNonce(xchacha20poly1305)(keyAsBytes); // manages nonces for you
+
+  return bytesToHex(chacha.encrypt(dataAsBytes));
+};
+
+export type SymmetricDecryptOptions = {
+  key: string;
+  data: string;
+};
+
+export const symmetricDecrypt = ({ key, data }: SymmetricDecryptOptions) => {
+  const keyAsBytes = sha256(key);
+  const dataAsBytes = hexToBytes(data);
+
+  const chacha = managedNonce(xchacha20poly1305)(keyAsBytes); // manages nonces for you
+
+  return chacha.decrypt(dataAsBytes);
+};
diff --git a/packages/prisma/migrations/20231105184518_add_2fa/migration.sql b/packages/prisma/migrations/20231105184518_add_2fa/migration.sql
new file mode 100644
index 000000000..8456bdbc6
--- /dev/null
+++ b/packages/prisma/migrations/20231105184518_add_2fa/migration.sql
@@ -0,0 +1,4 @@
+-- AlterTable
+ALTER TABLE "User" ADD COLUMN     "twoFactorBackupCodes" TEXT,
+ADD COLUMN     "twoFactorEnabled" BOOLEAN NOT NULL DEFAULT false,
+ADD COLUMN     "twoFactorSecret" TEXT;
diff --git a/packages/prisma/schema.prisma b/packages/prisma/schema.prisma
index 02807e4a0..7407bc5c0 100644
--- a/packages/prisma/schema.prisma
+++ b/packages/prisma/schema.prisma
@@ -19,25 +19,28 @@ enum Role {
 }
 
 model User {
-  id                 Int                  @id @default(autoincrement())
-  name               String?
-  email              String               @unique
-  emailVerified      DateTime?
-  password           String?
-  source             String?
-  signature          String?
-  createdAt          DateTime             @default(now())
-  updatedAt          DateTime             @default(now()) @updatedAt
-  lastSignedIn       DateTime             @default(now())
-  roles              Role[]               @default([USER])
-  identityProvider   IdentityProvider     @default(DOCUMENSO)
-  accounts           Account[]
-  sessions           Session[]
-  Document           Document[]
-  Subscription       Subscription?
-  PasswordResetToken PasswordResetToken[]
-  VerificationToken  VerificationToken[]
-  
+  id                   Int                  @id @default(autoincrement())
+  name                 String?
+  email                String               @unique
+  emailVerified        DateTime?
+  password             String?
+  source               String?
+  signature            String?
+  createdAt            DateTime             @default(now())
+  updatedAt            DateTime             @default(now()) @updatedAt
+  lastSignedIn         DateTime             @default(now())
+  roles                Role[]               @default([USER])
+  identityProvider     IdentityProvider     @default(DOCUMENSO)
+  accounts             Account[]
+  sessions             Session[]
+  Document             Document[]
+  Subscription         Subscription?
+  PasswordResetToken   PasswordResetToken[]
+  twoFactorSecret      String?
+  twoFactorEnabled     Boolean              @default(false)
+  twoFactorBackupCodes String?
+  VerificationToken    VerificationToken[]
+
   @@index([email])
 }
 
diff --git a/packages/trpc/package.json b/packages/trpc/package.json
index 05aed3147..54c1d5917 100644
--- a/packages/trpc/package.json
+++ b/packages/trpc/package.json
@@ -21,5 +21,6 @@
     "superjson": "^1.13.1",
     "ts-pattern": "^5.0.5",
     "zod": "^3.22.4"
-  }
+  },
+  "devDependencies": {}
 }
diff --git a/packages/trpc/server/auth-router/router.ts b/packages/trpc/server/auth-router/router.ts
index dfabd9da9..59c51ade5 100644
--- a/packages/trpc/server/auth-router/router.ts
+++ b/packages/trpc/server/auth-router/router.ts
@@ -1,10 +1,12 @@
 import { TRPCError } from '@trpc/server';
 
+import { ErrorCode } from '@documenso/lib/next-auth/error-codes';
+import { compareSync } from '@documenso/lib/server-only/auth/hash';
 import { createUser } from '@documenso/lib/server-only/user/create-user';
 import { sendConfirmationToken } from '@documenso/lib/server-only/user/send-confirmation-token';
 
-import { procedure, router } from '../trpc';
-import { ZSignUpMutationSchema } from './schema';
+import { authenticatedProcedure, procedure, router } from '../trpc';
+import { ZSignUpMutationSchema, ZVerifyPasswordMutationSchema } from './schema';
 
 export const authRouter = router({
   signup: procedure.input(ZSignUpMutationSchema).mutation(async ({ input }) => {
@@ -30,4 +32,23 @@ export const authRouter = router({
       });
     }
   }),
+
+  verifyPassword: authenticatedProcedure
+    .input(ZVerifyPasswordMutationSchema)
+    .mutation(({ ctx, input }) => {
+      const user = ctx.user;
+
+      const { password } = input;
+
+      if (!user.password) {
+        throw new TRPCError({
+          code: 'BAD_REQUEST',
+          message: ErrorCode.INCORRECT_PASSWORD,
+        });
+      }
+
+      const valid = compareSync(password, user.password);
+
+      return valid;
+    }),
 });
diff --git a/packages/trpc/server/auth-router/schema.ts b/packages/trpc/server/auth-router/schema.ts
index bdc9cd742..cc969c679 100644
--- a/packages/trpc/server/auth-router/schema.ts
+++ b/packages/trpc/server/auth-router/schema.ts
@@ -8,3 +8,5 @@ export const ZSignUpMutationSchema = z.object({
 });
 
 export type TSignUpMutationSchema = z.infer<typeof ZSignUpMutationSchema>;
+
+export const ZVerifyPasswordMutationSchema = ZSignUpMutationSchema.pick({ password: true });
diff --git a/packages/trpc/server/router.ts b/packages/trpc/server/router.ts
index dbf6ca03d..5b09478dc 100644
--- a/packages/trpc/server/router.ts
+++ b/packages/trpc/server/router.ts
@@ -6,6 +6,7 @@ import { profileRouter } from './profile-router/router';
 import { shareLinkRouter } from './share-link-router/router';
 import { singleplayerRouter } from './singleplayer-router/router';
 import { router } from './trpc';
+import { twoFactorAuthenticationRouter } from './two-factor-authentication-router/router';
 
 export const appRouter = router({
   auth: authRouter,
@@ -15,6 +16,7 @@ export const appRouter = router({
   admin: adminRouter,
   shareLink: shareLinkRouter,
   singleplayer: singleplayerRouter,
+  twoFactorAuthentication: twoFactorAuthenticationRouter,
 });
 
 export type AppRouter = typeof appRouter;
diff --git a/packages/trpc/server/two-factor-authentication-router/router.ts b/packages/trpc/server/two-factor-authentication-router/router.ts
new file mode 100644
index 000000000..a10f7a543
--- /dev/null
+++ b/packages/trpc/server/two-factor-authentication-router/router.ts
@@ -0,0 +1,105 @@
+import { TRPCError } from '@trpc/server';
+
+import { ErrorCode } from '@documenso/lib/next-auth/error-codes';
+import { disableTwoFactorAuthentication } from '@documenso/lib/server-only/2fa/disable-2fa';
+import { enableTwoFactorAuthentication } from '@documenso/lib/server-only/2fa/enable-2fa';
+import { getBackupCodes } from '@documenso/lib/server-only/2fa/get-backup-code';
+import { setupTwoFactorAuthentication } from '@documenso/lib/server-only/2fa/setup-2fa';
+import { compareSync } from '@documenso/lib/server-only/auth/hash';
+
+import { authenticatedProcedure, router } from '../trpc';
+import {
+  ZDisableTwoFactorAuthenticationMutationSchema,
+  ZEnableTwoFactorAuthenticationMutationSchema,
+  ZSetupTwoFactorAuthenticationMutationSchema,
+  ZViewRecoveryCodesMutationSchema,
+} from './schema';
+
+export const twoFactorAuthenticationRouter = router({
+  setup: authenticatedProcedure
+    .input(ZSetupTwoFactorAuthenticationMutationSchema)
+    .mutation(async ({ ctx, input }) => {
+      const user = ctx.user;
+
+      const { password } = input;
+
+      return await setupTwoFactorAuthentication({ user, password });
+    }),
+
+  enable: authenticatedProcedure
+    .input(ZEnableTwoFactorAuthenticationMutationSchema)
+    .mutation(async ({ ctx, input }) => {
+      try {
+        const user = ctx.user;
+
+        const { code } = input;
+
+        return await enableTwoFactorAuthentication({ user, code });
+      } catch (err) {
+        console.error(err);
+
+        throw new TRPCError({
+          code: 'BAD_REQUEST',
+          message: 'We were unable to enable two-factor authentication. Please try again later.',
+        });
+      }
+    }),
+
+  disable: authenticatedProcedure
+    .input(ZDisableTwoFactorAuthenticationMutationSchema)
+    .mutation(async ({ ctx, input }) => {
+      try {
+        const user = ctx.user;
+
+        const { password, backupCode } = input;
+
+        return await disableTwoFactorAuthentication({ user, password, backupCode });
+      } catch (err) {
+        console.error(err);
+
+        throw new TRPCError({
+          code: 'BAD_REQUEST',
+          message: 'We were unable to disable two-factor authentication. Please try again later.',
+        });
+      }
+    }),
+
+  viewRecoveryCodes: authenticatedProcedure
+    .input(ZViewRecoveryCodesMutationSchema)
+    .mutation(async ({ ctx, input }) => {
+      try {
+        const user = ctx.user;
+
+        const { password } = input;
+
+        if (!user.twoFactorEnabled) {
+          throw new TRPCError({
+            code: 'BAD_REQUEST',
+            message: ErrorCode.TWO_FACTOR_SETUP_REQUIRED,
+          });
+        }
+
+        if (!user.password || !compareSync(password, user.password)) {
+          throw new TRPCError({
+            code: 'UNAUTHORIZED',
+            message: ErrorCode.INCORRECT_PASSWORD,
+          });
+        }
+
+        const recoveryCodes = await getBackupCodes({ user });
+
+        return { recoveryCodes };
+      } catch (err) {
+        console.error(err);
+
+        if (err instanceof TRPCError) {
+          throw err;
+        }
+
+        throw new TRPCError({
+          code: 'BAD_REQUEST',
+          message: 'We were unable to view your recovery codes. Please try again later.',
+        });
+      }
+    }),
+});
diff --git a/packages/trpc/server/two-factor-authentication-router/schema.ts b/packages/trpc/server/two-factor-authentication-router/schema.ts
new file mode 100644
index 000000000..3a831845f
--- /dev/null
+++ b/packages/trpc/server/two-factor-authentication-router/schema.ts
@@ -0,0 +1,32 @@
+import { z } from 'zod';
+
+export const ZSetupTwoFactorAuthenticationMutationSchema = z.object({
+  password: z.string().min(1),
+});
+
+export type TSetupTwoFactorAuthenticationMutationSchema = z.infer<
+  typeof ZSetupTwoFactorAuthenticationMutationSchema
+>;
+
+export const ZEnableTwoFactorAuthenticationMutationSchema = z.object({
+  code: z.string().min(6).max(6),
+});
+
+export type TEnableTwoFactorAuthenticationMutationSchema = z.infer<
+  typeof ZEnableTwoFactorAuthenticationMutationSchema
+>;
+
+export const ZDisableTwoFactorAuthenticationMutationSchema = z.object({
+  password: z.string().min(6).max(72),
+  backupCode: z.string().trim(),
+});
+
+export type TDisableTwoFactorAuthenticationMutationSchema = z.infer<
+  typeof ZDisableTwoFactorAuthenticationMutationSchema
+>;
+
+export const ZViewRecoveryCodesMutationSchema = z.object({
+  password: z.string().min(6).max(72),
+});
+
+export type TViewRecoveryCodesMutationSchema = z.infer<typeof ZViewRecoveryCodesMutationSchema>;
diff --git a/packages/tsconfig/process-env.d.ts b/packages/tsconfig/process-env.d.ts
index 749cfcc43..717f13ade 100644
--- a/packages/tsconfig/process-env.d.ts
+++ b/packages/tsconfig/process-env.d.ts
@@ -7,6 +7,7 @@ declare namespace NodeJS {
     NEXT_PRIVATE_GOOGLE_CLIENT_SECRET?: string;
 
     NEXT_PRIVATE_DATABASE_URL: string;
+    NEXT_PRIVATE_ENCRYPTION_KEY: string;
 
     NEXT_PUBLIC_STRIPE_COMMUNITY_PLAN_MONTHLY_PRICE_ID: string;
     NEXT_PUBLIC_STRIPE_COMMUNITY_PLAN_YEARLY_PRICE_ID: string;
diff --git a/packages/ui/primitives/input.tsx b/packages/ui/primitives/input.tsx
index 1a5fba1bb..ac739c984 100644
--- a/packages/ui/primitives/input.tsx
+++ b/packages/ui/primitives/input.tsx
@@ -1,6 +1,9 @@
 import * as React from 'react';
 
+import { Eye, EyeOff } from 'lucide-react';
+
 import { cn } from '../lib/utils';
+import { Button } from './button';
 
 export type InputProps = React.InputHTMLAttributes<HTMLInputElement>;
 
@@ -25,4 +28,38 @@ const Input = React.forwardRef<HTMLInputElement, InputProps>(
 
 Input.displayName = 'Input';
 
-export { Input };
+const PasswordInput = React.forwardRef<HTMLInputElement, InputProps>(
+  ({ className, ...props }, ref) => {
+    const [showPassword, setShowPassword] = React.useState(false);
+
+    return (
+      <div className="relative">
+        <Input
+          id="password"
+          type={showPassword ? 'text' : 'password'}
+          className={cn('pr-10', className)}
+          ref={ref}
+          {...props}
+        />
+
+        <Button
+          variant="link"
+          type="button"
+          className="absolute right-0 top-0 flex h-full items-center justify-center pr-3"
+          aria-label={showPassword ? 'Mask password' : 'Reveal password'}
+          onClick={() => setShowPassword((show) => !show)}
+        >
+          {showPassword ? (
+            <EyeOff aria-hidden className="text-muted-foreground h-5 w-5" />
+          ) : (
+            <Eye aria-hidden className="text-muted-foreground h-5 w-5" />
+          )}
+        </Button>
+      </div>
+    );
+  },
+);
+
+PasswordInput.displayName = 'Input';
+
+export { Input, PasswordInput };
diff --git a/turbo.json b/turbo.json
index 0f0038887..36b169a80 100644
--- a/turbo.json
+++ b/turbo.json
@@ -33,6 +33,7 @@
   "globalDependencies": ["**/.env.*local"],
   "globalEnv": [
     "APP_VERSION",
+    "NEXT_PRIVATE_ENCRYPTION_KEY",
     "NEXTAUTH_URL",
     "NEXTAUTH_SECRET",
     "NEXT_PUBLIC_PROJECT",