From 2ca511865b0caf3108819cfd6ee775124ea70dff Mon Sep 17 00:00:00 2001
From: Justin Wind <justin.wind+git@gmail.com>
Date: Sun, 24 Sep 2023 14:05:35 -0700
Subject: [PATCH] rudimentary support for totp 2fa

---
 lib/authenticator.js          |  70 +++--
 lib/enum.js                   |   5 +
 lib/session-manager.js        | 297 ++++++++++++------
 lib/template/ia-html.js       |   6 +-
 lib/template/index.js         |   2 +
 lib/template/otp-html.js      |  54 ++++
 package-lock.json             | 557 +++++++++++++++++++---------------
 package.json                  |   9 +-
 test/lib/authenticator.js     |  35 ++-
 test/lib/session-manager.js   | 129 +++++++-
 test/lib/template/otp-html.js |  38 +++
 11 files changed, 830 insertions(+), 372 deletions(-)
 create mode 100644 lib/template/otp-html.js
 create mode 100644 test/lib/template/otp-html.js

diff --git a/lib/authenticator.js b/lib/authenticator.js
index ba5d921..da6b718 100644
--- a/lib/authenticator.js
+++ b/lib/authenticator.js
@@ -4,11 +4,18 @@ const common = require('./common');
 const Enum = require('./enum');
 const Errors = require('./errors');
 const { MysteryBox } = require('@squeep/mystery-box');
+const { TOTP } = require('@squeep/totp');
 const { name: packageName } = require('../package');
 
 const _fileScope = common.fileScope(__filename);
 
 class Authenticator {
+  /**
+   * @typedef {Object} AuthInfo
+   * @property {String} identifier
+   * @property {String} credentials
+   * @property {String=} otpKey
+   */
   /**
    * @param {Console} logger
    * @param {*} db
@@ -55,15 +62,19 @@ class Authenticator {
     this.mysteryBox.on('statistics', common.mysteryBoxLogger(logger, _fileScope(this.constructor.name)));
 
     this.cookieLifespan = options.authenticator.inactiveSessionLifespanSeconds || 60 * 60 * 24 * 32;
+
+    this.TOTP = TOTP; // For ease of test stubbing.
   }
 
 
   /**
    * Check local auth entries.
    * Sets ctx.authenticatedId if valid.
+   * Sets ctx.otpNeeded if account has otpKey.
    * @param {String} identifier
    * @param {String} credential
    * @param {Object} ctx
+   * @returns {Promise<Boolean>}
    */
   async isValidIdentifierCredential(identifier, credential, ctx) {
     const _scope = _fileScope('isValidIdentifierCredential');
@@ -79,16 +90,14 @@ class Authenticator {
       const authData = await this.db.authenticationGet(dbCtx, identifier);
       if (!authData) {
         this.logger.debug(_scope, 'failed, invalid identifier', { ctx, identifier });
+      } else if (authData.credential.startsWith('$argon2')
+      &&         this.authnEnabled.includes('argon2')) {
+        isValid = await this.authn.argon2.verify(authData.credential, credential);
+      } else if (authData.credential.startsWith('$PAM$')
+      &&         this.authnEnabled.includes('pam')) {
+        isValid = this._isValidPAMIdentifier(identifier, credential);
       } else {
-        if (authData.credential.startsWith('$argon2')
-        &&  this.authnEnabled.includes('argon2')) {
-          isValid = await this.authn.argon2.verify(authData.credential, credential);
-        } else if (authData.credential.startsWith('$PAM$')
-        &&         this.authnEnabled.includes('pam')) {
-          isValid = this._isValidPAMIdentifier(identifier, credential);
-        } else {
-          this.logger.error(_scope, 'failed, unknown or unsupported type of stored credential', { identifier, ctx });
-        }
+        this.logger.error(_scope, 'failed, unknown or unsupported type of stored credential', { identifier, ctx });
       }
 
       if (this.authnEnabled.includes('DEBUG_ANY')) {
@@ -97,6 +106,7 @@ class Authenticator {
 
       if (isValid) {
         ctx.authenticationId = identifier;
+        ctx.otpNeeded = !!authData?.otpKey;
         await this.db.authenticationSuccess(dbCtx, identifier);
       }
     }); // dbCtx
@@ -109,7 +119,7 @@ class Authenticator {
    * Check system PAM.
    * @param {String} identifier
    * @param {String} credential
-   * @returns {Boolean}
+   * @returns {Promise<Boolean>}
    */
   async _isValidPAMIdentifier(identifier, credential) {
     const _scope = _fileScope('_isValidPAMIdentifier');
@@ -130,11 +140,38 @@ class Authenticator {
   }
 
 
+  /**
+   * 
+   * @param {Object} state
+   * @param {String} state.key
+   * @param {Number} state.attempt
+   * @param {Number} state.epochMs
+   * @param {String} otp
+   * @returns {String} Enum.OTPResult
+   */
+  checkOTP(state, otp) {
+    const totp = new this.TOTP({
+      ...this.options?.authenticator?.otpOptions,
+      ...state,
+    });
+    const isValid = totp.validate(otp);
+    if (isValid) {
+      return Enum.OTPResult.Valid;
+    }
+    const otpAttemptsRemain = state.attempt <= (this.options?.authenticator?.otpAttemptsAllowed ?? 3);
+    const otpWithinWindow = state.epochMs + (this.options?.authenticator?.otpWindowMs ?? 600000) > Date.now();
+    if (otpAttemptsRemain && otpWithinWindow) {
+      return Enum.OTPResult.InvalidSoftFail;
+    }
+    return Enum.OTPResult.InvalidHardFail;
+  }
+
+
   /**
    * Check for valid Basic auth, updates ctx with identifier if valid.
    * @param {String} credentials
    * @param {Object} ctx
-   * @returns {Boolean}
+   * @returns {Promise<Boolean>}
    */
   async isValidBasic(credentials, ctx) {
     const _scope = _fileScope('isValidBasic');
@@ -150,6 +187,7 @@ class Authenticator {
    * Determine which Authorization header is available, and if it is valid.
    * @param {String} authorizationHeader
    * @param {Object} ctx
+   * @returns {Promise<Boolean>}
    */
   async isValidAuthorization(authorizationHeader, ctx) {
     const _scope = _fileScope('isValidAuthorization');
@@ -378,12 +416,10 @@ class Authenticator {
         this.logger.debug(_scope, 'valid authorization', { ctx, sessionAlsoValid });
         return true;
       }
-    } else {
-      if (sessionAlsoValid
-      &&  await this.sessionCheck(req, res, ctx, undefined, false, false)) {
-        this.logger.debug(_scope, 'valid session', { ctx, sessionAlsoValid });
-        return true;
-      }
+    } else if (sessionAlsoValid
+    &&         await this.sessionCheck(req, res, ctx, undefined, false, false)) {
+      this.logger.debug(_scope, 'valid session', { ctx, sessionAlsoValid });
+      return true;
     }
 
     this.logger.debug(_scope, 'invalid authorization', { ctx, sessionAlsoValid });
diff --git a/lib/enum.js b/lib/enum.js
index 8f2471a..66e2856 100644
--- a/lib/enum.js
+++ b/lib/enum.js
@@ -12,6 +12,11 @@ const Enum = mergeDeep(DingusEnum, {
     WWWAuthenticate: 'WWW-Authenticate',
   },
   SessionCookie: 'squeepSession',
+  OTPResult: {
+    Valid: 'Valid',
+    InvalidSoftFail: 'InvalidSoftFail',
+    InvalidHardFail: 'InvalidHardFail',
+  },
 });
 
 module.exports = freezeDeep(Enum);
diff --git a/lib/session-manager.js b/lib/session-manager.js
index 43990cc..48ec11a 100644
--- a/lib/session-manager.js
+++ b/lib/session-manager.js
@@ -58,7 +58,7 @@ class SessionManager {
     if (this.options.authenticator.secureAuthOnly) {
       cookieParts.push('Secure');
     }
-    if (typeof(maxAge) === 'number') {
+    if (typeof maxAge === 'number') {
       cookieParts.push(`Max-Age=${maxAge}`);
     }
     if (path) {
@@ -79,7 +79,21 @@ class SessionManager {
     const _scope = _fileScope('getAdminLogin');
     this.logger.debug(_scope, 'called', { ctx });
 
-    res.end(Template.LoginHTML(ctx, this.options));
+    // If there is already a valid session established, and if a
+    // redirect is present, follow it.  Why?  Maybe someone had
+    // multiple tabs open, their session expired, and their browser
+    // restarted, reloading all of them, and they have relogged in
+    // on one and just want to hit reload on the others to go back
+    // to where they were.
+    const redirect = ctx.queryParams['r'];
+    if (ctx.authenticationId && redirect) {
+      res.statusCode = 302;
+      res.setHeader(Enum.Header.Location, redirect);
+      res.end();
+    } else {
+      res.end(Template.LoginHTML(ctx, this.options));
+    }
+
     this.logger.info(_scope, 'finished', { ctx })
   }
 
@@ -95,113 +109,98 @@ class SessionManager {
 
     ctx.errors = [];
 
-    const redirect = ctx.queryParams['r'] || './';
-
-    // Only attempt user login if no IndieAuth profile is set
-    if (!this.options.authenticator.authnEnabled.includes('indieAuth') || !ctx.parsedBody['me']) {
-
-      const identifier = ctx.parsedBody['identifier'];
-      const credential = ctx.parsedBody['credential']; // N.B. Logger must specifically mask this field from ctx.
-
-      const isValidLocalIdentifier = await this.authenticator.isValidIdentifierCredential(identifier, credential, ctx);
-      if (!isValidLocalIdentifier) {
-        ctx.errors.push('Invalid username or password');
-      }
-
-      if (ctx.errors.length) {
-        res.end(Template.LoginHTML(ctx, this.options));
-        return;
-      }
+    // Check if this was an OTP entry attempt.
+    if (await this._otpSubmission(res, ctx)) {
+      // OTP path was taken, either successful entry and session creation, or re-prompting for otp.
+      return;
+    }
 
-      // Valid auth, persist the authenticated session
-      ctx.session = {
-        authenticatedIdentifier: ctx.authenticationId,
-      };
-      await this._sessionCookieSet(res, ctx.session, this.cookieLifespan);
-      res.statusCode = 302;
-      res.setHeader(Enum.Header.Location, redirect);
-      res.end();
-      this.logger.info(_scope, 'finished local', { ctx });
+    if (await this._localUserAuth(res, ctx)) {
+      // Local auth path was taken.
       return;
     }
 
     // Otherwise, carry on with IndieAuth handshake.
+
+    // Is profile a reasonable url?
     let me, meAutoScheme, session, authorizationEndpoint;
     try {
       me = new URL(ctx.parsedBody['me']);
       meAutoScheme = !!ctx.parsedBody['me_auto_scheme'];
-
     } catch (e) {
       this.logger.debug(_scope, 'failed to parse supplied profile url', { ctx });
       ctx.errors.push(`Unable to understand '${ctx.parsedBody['me']}' as a profile URL.`);
     }
 
-    if (this.options.authenticator.authnEnabled.includes('indieAuth')
-    &&  me) {
-      let profile;
+    if (ctx.errors.length) {
+      res.end(Template.LoginHTML(ctx, this.options));
+      return;
+    }
+
+    let profile;
+    profile = await this.indieAuthCommunication.fetchProfile(me);
+    if ((!profile?.metadata)
+    &&  meAutoScheme) {
+      this.logger.debug(_scope, 'trying http fallback', { ctx });
+      me.protocol = 'http';
       profile = await this.indieAuthCommunication.fetchProfile(me);
-      if ((!profile?.metadata)
-      &&  meAutoScheme) {
-        this.logger.debug(_scope, 'trying http fallback', { ctx });
-        me.protocol = 'http';
-        profile = await this.indieAuthCommunication.fetchProfile(me);
+    }
+    if (!profile?.metadata) {
+      this.logger.debug(_scope, 'failed to find any profile information at url', { ctx });
+      ctx.errors.push(`No profile information was found at '${me}'.`);
+    } else {
+      // fetch and parse me for 'authorization_endpoint' relation links
+      try {
+        authorizationEndpoint = new URL(profile.metadata.authorizationEndpoint);
+      } catch (e) {
+        ctx.errors.push(`Unable to understand the authorization endpoint ('${profile.metadata.authorizationEndpoint}') indicated by that profile ('${me}') as a URL.`);
       }
-      if (!profile?.metadata) {
-        this.logger.debug(_scope, 'failed to find any profile information at url', { ctx });
-        ctx.errors.push(`No profile information was found at '${me}'.`);
-      } else {
-        // fetch and parse me for 'authorization_endpoint' relation links
-        try {
-          authorizationEndpoint = new URL(profile.metadata.authorizationEndpoint);
-        } catch (e) {
-          ctx.errors.push(`Unable to understand the authorization endpoint ('${profile.metadata.authorizationEndpoint}') indicated by that profile ('${me}') as a URL.`);
-        }
 
-        if (profile.metadata.issuer) {
-          // Validate issuer
-          try {
-            const issuer = new URL(profile.metadata.issuer);
-            if (issuer.hash
-            ||  issuer.search
-            ||  issuer.protocol.toLowerCase() !== 'https:') { // stupid URL trailing colon thing
-              this.logger.debug(_scope, 'supplied issuer url invalid', { ctx });
-              ctx.errors.push('Authorization server provided an invalid issuer field.');
-            }
-          } catch (e) {
-            this.logger.debug(_scope, 'failed to parse supplied issuer url', { ctx });
-            ctx.errors.push('Authorization server provided an unparsable issuer field.');
+      if (profile.metadata.issuer) {
+        // Validate issuer
+        try {
+          const issuer = new URL(profile.metadata.issuer);
+          if (issuer.hash
+          ||  issuer.search
+          ||  issuer.protocol.toLowerCase() !== 'https:') { // stupid URL trailing colon thing
+            this.logger.debug(_scope, 'supplied issuer url invalid', { ctx });
+            ctx.errors.push('Authorization server provided an invalid issuer field.');
           }
-        } else {
-          this.logger.debug(_scope, 'no issuer in metadata, assuming legacy mode', { ctx });
-          // Strict 20220212 compliance would error here.
-          // ctx.errors.push('Authorization server did not provide issuer field, as required by current specification.');
+        } catch (e) {
+          this.logger.debug(_scope, 'failed to parse supplied issuer url', { ctx });
+          ctx.errors.push('Authorization server provided an unparsable issuer field.');
         }
+      } else {
+        this.logger.debug(_scope, 'no issuer in metadata, assuming legacy mode', { ctx });
+        // Strict 20220212 compliance would error here.
+        // ctx.errors.push('Authorization server did not provide issuer field, as required by current specification.');
       }
+    }
 
-      if (authorizationEndpoint) {
-        const pkce = await IndieAuthCommunication.generatePKCE();
-
-        const state = randomUUID();
-        session = {
-          authorizationEndpoint: authorizationEndpoint.href,
-          state,
-          codeVerifier: pkce.codeVerifier,
-          me,
-          redirect,
-          issuer: profile.metadata.issuer,
-        };
-
-        // Update auth endpoint parameters
-        Object.entries({
-          'response_type': 'code',
-          'client_id': this.options.dingus.selfBaseUrl,
-          'redirect_uri': `${this.options.dingus.selfBaseUrl}admin/_ia`,
-          'state': session.state,
-          'code_challenge': pkce.codeChallenge,
-          'code_challenge_method': pkce.codeChallengeMethod,
-          'me': me,
-        }).forEach(([name, value]) => authorizationEndpoint.searchParams.set(name, value));
-      }
+    if (authorizationEndpoint) {
+      const pkce = await IndieAuthCommunication.generatePKCE();
+
+      const state = randomUUID();
+      const redirect = ctx.queryParams['r'] || './';
+      session = {
+        authorizationEndpoint: authorizationEndpoint.href,
+        state,
+        codeVerifier: pkce.codeVerifier,
+        me,
+        redirect,
+        issuer: profile.metadata.issuer,
+      };
+
+      // Update auth endpoint parameters
+      Object.entries({
+        'response_type': 'code',
+        'client_id': this.options.dingus.selfBaseUrl,
+        'redirect_uri': `${this.options.dingus.selfBaseUrl}admin/_ia`,
+        'state': session.state,
+        'code_challenge': pkce.codeChallenge,
+        'code_challenge_method': pkce.codeChallengeMethod,
+        'me': me,
+      }).forEach(([name, value]) => authorizationEndpoint.searchParams.set(name, value));
     }
 
     if (ctx.errors.length) {
@@ -218,6 +217,126 @@ class SessionManager {
   }
 
 
+  /**
+   * Check if processing an OTP entry attempt.  If not, resume login flow.
+   * If so, validate otp and establish session, else reprompt for OTP, or
+   * return to login entry after too many failures.
+   * @param {*} res
+   * @param {*} ctx
+   * @returns {Boolean} true if otp was handled, otherwise false indicates further login processing needed
+   */
+  async _otpSubmission(res, ctx) {
+    const _scope = _fileScope('_otpSubmission');
+
+    // Are we processing an OTP entry attempt?
+    const { otp, state: stateBox } = ctx.parsedBody;
+    let state;
+    try {
+      if (stateBox) {
+        state = await this.mysteryBox.unpack(stateBox);
+      }
+    } catch (e) {
+      this.logger.debug(_scope, 'failed to unpack otp state', { error: e, ctx });
+      // Ignore and continue back to main login
+      return false;
+    }
+    if (otp && state) {
+      const OTPResult = await this.authenticator.checkOTP(state, otp);
+      switch (OTPResult) {
+        case Enum.OTPResult.Valid:
+          // successful otp entry
+          // Valid auth, persist the authenticated session
+          ctx.session = {
+            authenticatedIdentifier: state.authenticationId,
+          };
+          await this._sessionCookieSet(res, ctx.session, this.cookieLifespan);
+          res.statusCode = 302;
+          res.setHeader(Enum.Header.Location, state.redirect);
+          res.end();
+          this.logger.info(_scope, 'finished otp', { ctx });
+          return true;
+
+        case Enum.OTPResult.InvalidSoftFail:
+          // retry otp entry
+          ctx.otpNeeded = true;
+          ctx.errors.push('Invalid OTP token.');
+          ctx.otpState = await this.mysteryBox.pack({
+            ...state,
+            attempt: state.attempt + 1,
+          });
+          res.end(Template.OTPHTML(ctx, this.options));
+          this.logger.info(_scope, 'finished otp, invalid, request again', { ctx });
+          return true;
+
+        case Enum.OTPResult.InvalidHardFail:
+          // return to initial login
+          this.logger.debug(_scope, 'too many otp failures', { ctx, state });
+          ctx.errors.push('Invalid OTP token, and too many failures.  Try again.');
+          return false;
+
+        default:
+          throw new RangeError('Unexpected OTPResult');
+      }
+    }
+    // not in otp flow
+    return false;
+  }
+
+  /**
+   * 
+   * @param {http.ServerResponse} res
+   * @param {Object} ctx
+   */
+  async _localUserAuth(res, ctx) {
+    const _scope = _fileScope('_localUserAuth');
+
+    // If Indiauth enabled and profile was submitted, defer to that.
+    if (this.options.authenticator.authnEnabled.includes('indieAuth')
+    &&  ctx.parsedBody['me']) {
+      return false;
+    }
+
+    const redirect = ctx.queryParams['r'] || './';
+    const identifier = ctx.parsedBody['identifier'];
+    const credential = ctx.parsedBody['credential']; // N.B. Logger must specifically mask this field from ctx.
+
+    // N.B. validity check also sets autenticationId and otpNeeded on ctx
+    const isValidLocalIdentifier = await this.authenticator.isValidIdentifierCredential(identifier, credential, ctx);
+    if (!isValidLocalIdentifier) {
+      ctx.errors.push('Invalid username or password');
+    }
+
+    if (ctx.errors.length) {
+      res.end(Template.LoginHTML(ctx, this.options));
+      return true;
+    }
+
+    // If OTP exists for valid identifier, follow that flow.
+    if (ctx.otpNeeded) {
+      ctx.otpState = await this.mysteryBox.pack({
+        authenticatedIdentifier: ctx.authenticationId,
+        epochMs: Date.now(),
+        attempt: 0,
+        redirect,
+      });
+      res.end(Template.OTPHTML(ctx, this.options));
+      this.logger.info(_scope, 'finished local, otp required', { ctx });
+      return true;
+    }
+
+    // Valid auth, persist the authenticated session
+    ctx.session = {
+      authenticatedIdentifier: ctx.authenticationId,
+    };
+    await this._sessionCookieSet(res, ctx.session, this.cookieLifespan);
+    res.statusCode = 302;
+    res.setHeader(Enum.Header.Location, redirect);
+    res.end();
+    this.logger.info(_scope, 'finished local, no otp', { ctx });
+    return true;
+  }
+
+
   /**
    * GET request to remove current credentials.
    * @param {http.ServerResponse} res
@@ -254,7 +373,7 @@ class SessionManager {
 
     // Unpack cookie to restore session data
 
-    const [ cookieName, cookieValue ] = common.splitFirst((ctx.cookie || ''), '=', '');
+    const [cookieName, cookieValue] = common.splitFirst((ctx.cookie || ''), '=', '');
     if (cookieName !== Enum.SessionCookie) {
       this.logger.debug(_scope, 'no cookie', { ctx });
       ctx.errors.push('missing required cookie');
diff --git a/lib/template/ia-html.js b/lib/template/ia-html.js
index 00e2089..5de476a 100644
--- a/lib/template/ia-html.js
+++ b/lib/template/ia-html.js
@@ -2,6 +2,10 @@
 
 const { TemplateHelper: th } = require('@squeep/html-template-helper');
 
+/**
+ *
+ * @returns {String}
+ */
 function mainContent() {
   return [
     `<section>
@@ -31,7 +35,7 @@ module.exports = (ctx, options) => {
     ],
   };
   // Ensure there is always an error to report, even if we do not have one, as we ended up here somehow.
-  if (!ctx.errors || !ctx.errors.length) {
+  if (!ctx?.errors?.length) {
     ctx.errors = [
       'Unknown Error &mdash; we are not sure what just happened',
     ];
diff --git a/lib/template/index.js b/lib/template/index.js
index 69c70b9..c77123c 100644
--- a/lib/template/index.js
+++ b/lib/template/index.js
@@ -2,8 +2,10 @@
 
 const IAHTML = require('./ia-html');
 const LoginHTML = require('./login-html');
+const OTPHTML = require('./otp-html');
 
 module.exports = {
   IAHTML,
   LoginHTML,
+  OTPHTML,
 };
\ No newline at end of file
diff --git a/lib/template/otp-html.js b/lib/template/otp-html.js
new file mode 100644
index 0000000..cf7cef6
--- /dev/null
+++ b/lib/template/otp-html.js
@@ -0,0 +1,54 @@
+'use strict';
+
+const { TemplateHelper: th } = require('@squeep/html-template-helper');
+
+/**
+ * Login form, continued.
+ */
+
+function otpSection(ctx, options) {
+  const otpBlurb = (options.otpBlurb || []).map((x) => '\t'.repeat(6) + x).join('\n');
+  return `\t\t\t<section class="otp">
+\t\t\t\t<form action="" method="POST">
+\t\t\t\t\t<fieldset>
+\t\t\t\t\t\t<legend>Two-Factor Authentication</legend>
+\t\t\t\t\t\t<label for="otp">OTP Code</label>
+\t\t\t\t\t\t<input id="otp" name="otp" value="">
+\t\t\t\t\t\t<br>
+\t\t\t\t\t\t<button>Confirm</button>
+${otpBlurb}
+\t\t\t\t\t</fieldset>
+\t\t\t\t\t<input type="hidden" name="state" value="${ctx.otpState}">
+\t\t\t\t</form>
+\t\t\t</section`;
+}
+
+
+/**
+ * Render 2fs form.
+ * @param {Object} ctx
+ * @param {String[]=} ctx.errors
+ * @param {String} ctx.otpState
+ * @param {Object} options
+ * @param {String[]=} options.authenticator.otpBlurb
+ * @param {String[]=} options.authenticator.loginBlurb
+ * @param {Object} options.manager
+ * @param {String} options.manager.pageTitle
+ * @param {String=} options.manager.logoUrl
+ * @param {Object} options.dingus
+ * @param {String} options.dingus.selfBaseUrl
+ * @returns {String}
+ */
+module.exports = (ctx, options) => {
+  const htmlOptions = {
+    pageTitle: options.manager.pageTitle,
+    logoUrl: options.manager.logoUrl,
+    footerEntries: options.manager.footerEntries,
+    otpBlurb: options.authenticator?.otpBlurb,
+  };
+  const mainContent = [
+    ...(options.authenticator?.loginBlurb || []),
+    otpSection(ctx, htmlOptions),
+  ];
+  return th.htmlPage(2, ctx, htmlOptions, mainContent);
+};
\ No newline at end of file
diff --git a/package-lock.json b/package-lock.json
index f7b64c0..5e8cb2f 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -12,10 +12,11 @@
         "@squeep/api-dingus": "v2.0.0",
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+      "version": "6.2.0",
+      "resolved": "https://registry.npmjs.org/tar/-/tar-6.2.0.tgz",
+      "integrity": "sha512-/Wo7DcT0u5HUV486xg675HtjNd3BXZ6xDbzsCUZPt5iw8bTQ63bP0Raut3mvro9u+CUyq7YQd8Cx55fsZXxqLQ==",
       "optional": true,
       "requires": {
         "chownr": "^2.0.0",
@@ -8629,9 +8680,9 @@
       "devOptional": true
     },
     "uuid": {
-      "version": "9.0.0",
-      "resolved": "https://registry.npmjs.org/uuid/-/uuid-9.0.0.tgz",
-      "integrity": "sha512-MXcSTerfPa4uqyzStbRoTgt5XIe3x5+42+q1sDuy3R5MDk66URdLMOZe5aPX/SQd+kuYAh0FdP/pO28IkQyTeg=="
+      "version": "9.0.1",
+      "resolved": "https://registry.npmjs.org/uuid/-/uuid-9.0.1.tgz",
+      "integrity": "sha512-b+1eJOlsR9K8HJpow9Ok3fiWOWSIcIzXodvv0rQjVoOVNpWMpxf1wZNpt4y9h10odCNrqnYp1OBzRktckBe3sA=="
     },
     "webidl-conversions": {
       "version": "3.0.1",
diff --git a/package.json b/package.json
index a1a55c4..a1b37a5 100644
--- a/package.json
+++ b/package.json
@@ -33,14 +33,15 @@
     "@squeep/api-dingus": "v2.0.0",
     "@squeep/html-template-helper": "git+https://git.squeep.com/squeep-html-template-helper#v1.4.0",
     "@squeep/indieauth-helper": "^1.3.0",
-    "@squeep/mystery-box": "^2.0.1"
+    "@squeep/mystery-box": "^2.0.1",
+    "@squeep/totp": "git+https://git.squeep.com/squeep-totp#v1.1.0"
   },
   "optionalDependencies": {
-    "argon2": "^0.31.0",
+    "argon2": "^0.31.1",
     "node-linux-pam": "^0.2.1"
   },
   "devDependencies": {
-    "eslint": "^8.48.0",
+    "eslint": "^8.50.0",
     "eslint-plugin-node": "^11.1.0",
     "eslint-plugin-promise": "^6.1.1",
     "eslint-plugin-security": "^1.7.1",
@@ -49,6 +50,6 @@
     "mocha": "^10.2.0",
     "nyc": "^15.1.0",
     "pre-commit": "^1.2.2",
-    "sinon": "^15.2.0"
+    "sinon": "^16.0.0"
   }
 }
diff --git a/test/lib/authenticator.js b/test/lib/authenticator.js
index 6cac48f..7576168 100644
--- a/test/lib/authenticator.js
+++ b/test/lib/authenticator.js
@@ -6,7 +6,6 @@ const sinon = require('sinon'); // eslint-disable-line node/no-unpublished-requi
 const Authenticator = require('../../lib/authenticator');
 const stubLogger = require('../stub-logger');
 const stubDb = require('../stub-db');
-const Errors = require('../../lib/errors');
 const Enum = require('../../lib/enum');
 const Config = require('../stub-config');
 
@@ -267,6 +266,40 @@ describe('Authenticator', function () {
     });
   }); // isValidCookieAuth
 
+  describe('checkOTP', function () {
+    let state, otp;
+    this.beforeEach(function () {
+      sinon.stub(authenticator.TOTP.prototype, 'validate').returns(true);
+      state = {
+        key: Buffer.from('12345678901234567890'),
+        attempt: 0,
+        epochMs: Date.now(),
+      };
+      otp = '000000';
+    });
+    it('covers valid OTP entry', function () {
+      const result = authenticator.checkOTP(state, otp);
+      assert.strictEqual(result, Enum.OTPResult.Valid);
+    });
+    it('covers invalid OTP entry', function () {
+      authenticator.TOTP.prototype.validate.returns(false);
+      const result = authenticator.checkOTP(state, otp);
+      assert.strictEqual(result, Enum.OTPResult.InvalidSoftFail);
+    });
+    it('covers invalid OTP entry, too many failures', function () {
+      state.attempt = 10;
+      authenticator.TOTP.prototype.validate.returns(false);
+      const result = authenticator.checkOTP(state, otp);
+      assert.strictEqual(result, Enum.OTPResult.InvalidHardFail);
+    });
+    it('covers invalid OTP entry', function () {
+      state.epochMs = 0;
+      authenticator.TOTP.prototype.validate.returns(false);
+      const result = authenticator.checkOTP(state, otp);
+      assert.strictEqual(result, Enum.OTPResult.InvalidHardFail);
+    });
+  }); // checkOTP
+
   describe('sessionCheck', function () {
     let cookie, req, res, loginPath, required, profilesAllowed;
     beforeEach(function () {
diff --git a/test/lib/session-manager.js b/test/lib/session-manager.js
index a3efeaf..79abbf0 100644
--- a/test/lib/session-manager.js
+++ b/test/lib/session-manager.js
@@ -7,6 +7,7 @@ const assert = require('assert');
 const sinon = require('sinon'); // eslint-disable-line node/no-unpublished-require
 
 const SessionManager = require('../../lib/session-manager');
+const Enum = require('../../lib/enum');
 const Config = require('../stub-config');
 const stubLogger = require('../stub-logger');
 
@@ -25,9 +26,11 @@ describe('SessionManager', function () {
       params: {},
       queryParams: {},
       parsedBody: {},
+      errors: [],
     };
     stubAuthenticator = {
       isValidIdentifierCredential: sinon.stub(),
+      checkOTP: sinon.stub(),
     };
     manager = new SessionManager(stubLogger, stubAuthenticator, options);
     sinon.stub(manager.indieAuthCommunication);
@@ -61,12 +64,27 @@ describe('SessionManager', function () {
   }); // _sessionCookieSet
 
   describe('getAdminLogin', function () {
-    it('covers', async function () {
+    it('covers no session', async function () {
+      await manager.getAdminLogin(res, ctx);
+    });
+    it('covers established session', async function () {
+      ctx.authenticationId = 'identifier';
+      ctx.queryParams['r'] = '/admin';
       await manager.getAdminLogin(res, ctx);
+      assert.strictEqual(res.statusCode, 302);
+      assert(res.setHeader.called);
     });
   }); // getAdminLogin
 
   describe('postAdminLogin', function () {
+    beforeEach(function () {
+      sinon.stub(manager, '_otpSubmission').resolves(false);
+    });
+    it('covers otp submission', async function () {
+      manager._otpSubmission.resolves(true);
+      await manager.postAdminLogin(res, ctx);
+      assert(res.end.notCalled);
+    });
     it('covers valid local', async function () {
       ctx.parsedBody.identifier = 'user';
       ctx.parsedBody.credential = 'password';
@@ -115,15 +133,15 @@ describe('SessionManager', function () {
     });
     it('covers profile scheme fallback', async function () {
       ctx.parsedBody.me = 'https://example.com/profile';
-      ctx.parsedBody.me_auto_scheme = '1';
+      ctx.parsedBody['me_auto_scheme'] = '1';
       manager.indieAuthCommunication.fetchProfile
         .onCall(0).resolves()
         .onCall(1).resolves({
-        metadata: {
-          issuer: 'https://example.com/',
-          authorizationEndpoint: 'https://example.com/auth',
-        },
-      });
+          metadata: {
+            issuer: 'https://example.com/',
+            authorizationEndpoint: 'https://example.com/auth',
+          },
+        });
       await manager.postAdminLogin(res, ctx);
       assert.strictEqual(res.statusCode, 302);
 
@@ -165,6 +183,103 @@ describe('SessionManager', function () {
     }); // living-standard-20220212
   }); // postAdminLogin
 
+  describe('_otpSubmission', function () {
+    beforeEach(function () {
+      sinon.useFakeTimers(new Date());
+      sinon.stub(manager.mysteryBox, 'unpack').resolves({
+        authenticatedIdentifier: 'identifier',
+        attempt: 0,
+        epochMs: Date.now(),
+      });
+      manager.authenticator.checkOTP.resolves(Enum.OTPResult.Valid);
+      ctx.parsedBody.state = 'state_data';
+      ctx.parsedBody.otp = '123456';
+    });
+    it('returns false if no otp state', async function () {
+      delete ctx.parsedBody.state;
+      const result = await manager._otpSubmission(res, ctx);
+      assert(manager.mysteryBox.unpack.notCalled);
+      assert.strictEqual(result, false);
+    });
+    it('returns false when presented with invalid otp state', async function () {
+      manager.mysteryBox.unpack.rejects();
+      const result = await manager._otpSubmission(res, ctx);
+      assert(manager.mysteryBox.unpack.called);
+      assert.strictEqual(result, false);
+    });
+    it('returns true when submitted otp is invalid, but allowed to retry', async function () {
+      manager.authenticator.checkOTP.resolves(Enum.OTPResult.InvalidSoftFail);
+      const result = await manager._otpSubmission(res, ctx);
+      assert(manager.mysteryBox.unpack.called);
+      assert.strictEqual(result, true);
+      assert(res.end.called);
+    });
+    it('returns false when submitted otp is invalid and too many attempts', async function () {
+      manager.mysteryBox.unpack.resolves({
+        authenticatedIdentifier: 'identifier',
+        attempt: 10,
+        epochMs: Date.now(),
+      });
+      manager.authenticator.checkOTP.resolves(Enum.OTPResult.InvalidHardFail);
+      const result = await manager._otpSubmission(res, ctx);
+      assert(manager.mysteryBox.unpack.called);
+      assert.strictEqual(result, false);
+    });
+    it('returns false when submitted otp is invalid and too much time has passed', async function () {
+      manager.mysteryBox.unpack.resolves({
+        authenticatedIdentifier: 'identifier',
+        attempt: 0,
+        epochMs: Date.now() - 99999999,
+      });
+      manager.authenticator.checkOTP.resolves(Enum.OTPResult.InvalidHardFail);
+      const result = await manager._otpSubmission(res, ctx);
+      assert(manager.mysteryBox.unpack.called);
+      assert.strictEqual(result, false);
+    });
+    it('returns true when submitted otp is valid', async function () {
+      const result = await manager._otpSubmission(res, ctx);
+      assert(res.end.called);
+      assert.strictEqual(result, true);
+    });
+    it('covers unexpected otp response', async function () {
+      manager.authenticator.checkOTP.resolves('wrong');
+      assert.rejects(() => manager._otpSubmission(res, ctx), RangeError);
+    });
+  }); // _otpSubmission
+
+  describe('_localUserAuth', function () {
+    beforeEach(function () {
+      ctx.parsedBody.identifier = 'identifier';
+      ctx.parsedBody.credential = 'credential';
+      manager.authenticator.isValidIdentifierCredential.resolves(true);
+      sinon.stub(manager.mysteryBox, 'pack').resolves('box');
+    });
+    it('returns false if indieauth available', async function () {
+      ctx.parsedBody.me = 'https://example.com/';
+      const result = await manager._localUserAuth(res, ctx);
+      assert.strictEqual(result, false);
+    });
+    it('returns true if identifier is invalid', async function () {
+      manager.authenticator.isValidIdentifierCredential.resolves(false);
+      const result = await manager._localUserAuth(res, ctx);
+      assert.strictEqual(result, true);
+      assert(manager.authenticator.isValidIdentifierCredential.called);
+      assert(res.end.called);
+    });
+    it('returns true if valid identifier', async function () {
+      const result = await manager._localUserAuth(res, ctx);
+      assert.strictEqual(result, true);
+      assert(res.end.called);
+    });
+    it('returns true if valid identifier requires otp entry', async function () {
+      ctx.otpNeeded = true;
+      const result = await manager._localUserAuth(res, ctx);
+      assert.strictEqual(result, true);
+      assert(manager.mysteryBox.pack.called);
+      assert(res.end.called);
+    });
+  }); // _localUserAuth
+
   describe('getAdminLogout', function () {
     it('covers', async function () {
       await manager.getAdminLogout(res, ctx);
diff --git a/test/lib/template/otp-html.js b/test/lib/template/otp-html.js
new file mode 100644
index 0000000..5aa3d8b
--- /dev/null
+++ b/test/lib/template/otp-html.js
@@ -0,0 +1,38 @@
+/* eslint-env mocha */
+'use strict';
+
+const assert = require('assert');
+const { OTPHTML } = require('../../../lib/template');
+const lintHtml = require('../../lint-html');
+
+describe('Template OTPHTML', function () {
+  let ctx, options;
+  beforeEach(function () {
+    ctx = {};
+    options = {
+      authenticator: {
+        otpBlurb: ['otp info'],
+      },
+      manager: {
+        pageTitle: 'page',
+      },
+      dingus: {
+        selfBaseUrl: 'https://example.com/',
+      },
+    };
+  });
+
+  it('renders', function () {
+    ctx.errors = ['an error', 'another error'];
+    const result = OTPHTML(ctx, options);
+    lintHtml(result);
+    assert(result);
+  });
+
+  it('covers empty error', function () {
+    const result = OTPHTML(ctx, options);
+    lintHtml(result);
+    assert(result);
+  });
+
+});
\ No newline at end of file
-- 
2.43.2