diff --git a/config.json.example b/config.json.example
index 18959393..30bd3ced 100644
--- a/config.json.example
+++ b/config.json.example
@@ -93,6 +93,7 @@
             "idpCert": "change: certificate file path of IdP in PEM format",
             "issuer": "change or delete: identity of the service provider (default: serverurl)",
             "identifierFormat": "change or delete: name identifier format (default: 'urn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress')",
+            "disableRequestedAuthnContext": "change or delete: true to allow any authentication method, false restricts to password authentication method (default: false)",
             "groupAttribute": "change or delete: attribute name for group list (ex: memberOf)",
             "requiredGroups": [ "change or delete: group names that allowed" ],
             "externalGroups": [ "change or delete: group names that not allowed" ],
diff --git a/lib/config/default.js b/lib/config/default.js
index c9e09c00..3fc11fcc 100644
--- a/lib/config/default.js
+++ b/lib/config/default.js
@@ -144,6 +144,7 @@ module.exports = {
     idpCert: undefined,
     issuer: undefined,
     identifierFormat: 'urn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress',
+    disableRequestedAuthnContext: false,
     groupAttribute: undefined,
     externalGroups: [],
     requiredGroups: [],
diff --git a/lib/config/environment.js b/lib/config/environment.js
index b56848be..09a27e14 100644
--- a/lib/config/environment.js
+++ b/lib/config/environment.js
@@ -117,6 +117,7 @@ module.exports = {
     idpCert: process.env.CMD_SAML_IDPCERT,
     issuer: process.env.CMD_SAML_ISSUER,
     identifierFormat: process.env.CMD_SAML_IDENTIFIERFORMAT,
+    disableRequestedAuthnContext: toBooleanConfig(process.env.CMD_SAML_DISABLEREQUESTEDAUTHNCONTEXT),
     groupAttribute: process.env.CMD_SAML_GROUPATTRIBUTE,
     externalGroups: toArrayConfig(process.env.CMD_SAML_EXTERNALGROUPS, '|', []),
     requiredGroups: toArrayConfig(process.env.CMD_SAML_REQUIREDGROUPS, '|', []),
diff --git a/lib/config/hackmdEnvironment.js b/lib/config/hackmdEnvironment.js
index 7765e0af..3b2848c3 100644
--- a/lib/config/hackmdEnvironment.js
+++ b/lib/config/hackmdEnvironment.js
@@ -110,6 +110,7 @@ module.exports = {
     idpCert: process.env.HMD_SAML_IDPCERT,
     issuer: process.env.HMD_SAML_ISSUER,
     identifierFormat: process.env.HMD_SAML_IDENTIFIERFORMAT,
+    disableRequestedAuthnContext: toBooleanConfig(process.env.HMD_SAML_DISABLEREQUESTEDAUTHNCONTEXT),
     groupAttribute: process.env.HMD_SAML_GROUPATTRIBUTE,
     externalGroups: toArrayConfig(process.env.HMD_SAML_EXTERNALGROUPS, '|', []),
     requiredGroups: toArrayConfig(process.env.HMD_SAML_REQUIREDGROUPS, '|', []),
diff --git a/lib/web/auth/saml/index.js b/lib/web/auth/saml/index.js
index 575e2e47..df5f2835 100644
--- a/lib/web/auth/saml/index.js
+++ b/lib/web/auth/saml/index.js
@@ -17,7 +17,8 @@ passport.use(new SamlStrategy({
   entryPoint: config.saml.idpSsoUrl,
   issuer: config.saml.issuer || config.serverURL,
   cert: fs.readFileSync(config.saml.idpCert, 'utf-8'),
-  identifierFormat: config.saml.identifierFormat
+  identifierFormat: config.saml.identifierFormat,
+  disableRequestedAuthnContext: config.saml.disableRequestedAuthnContext
 }, function (user, done) {
   // check authorization if needed
   if (config.saml.externalGroups && config.saml.groupAttribute) {