Resolves dani-garcia/bitwarden_rs#981

* a user without 2fa trying to join a 2fa org will fail, but user gets an email to enable 2fa
* a user disabling 2fa will be removed from 2fa orgs; user gets an email for each org
* an org enabling 2fa policy will remove users without 2fa; users get an email

src/api/core/organizations.rs

@@ -647,6 +647,21 @@ fn accept_invite(_org_id: String, _org_user_id: String, data: JsonUpcase<AcceptD
                     err!("User already accepted the invitation")
                 }
 
+                let user_twofactor_disabled = TwoFactor::find_by_user(&user_org.user_uuid, &conn).is_empty();
+
+                let policy = OrgPolicyType::TwoFactorAuthentication as i32;
+                let org_twofactor_policy_enabled = match OrgPolicy::find_by_org_and_type(&user_org.org_uuid, policy, &conn) {
+                    Some(p) => p.enabled,
+                    None => false,
+                };
+
+                if org_twofactor_policy_enabled && user_twofactor_disabled {
+                    let org = Organization::find_by_uuid(&org, &conn).unwrap();
+                    // you haven't joined yet, but mail explains why you were unable to accept invitation
+                    mail::send_2fa_removed_from_org(&claims.email, &org.name)?;
+                    err!("Organization policy requires that you enable two Two-step Login begin joining.")
+                }
+
                 user_org.status = UserOrgStatus::Accepted as i32;
                 user_org.save(&conn)?;
             }
@@ -996,6 +1011,24 @@ fn put_policy(org_id: String, pol_type: i32, data: Json<PolicyData>, _headers: A
         Some(pt) => pt,
         None => err!("Invalid policy type"),
     };
+       
+    if pol_type_enum == OrgPolicyType::TwoFactorAuthentication && data.enabled {
+
+        let org_list = UserOrganization::find_by_org(&org_id, &conn);
+
+        for user_org in org_list.into_iter() {
+            let user_twofactor_disabled = TwoFactor::find_by_user(&user_org.user_uuid, &conn).is_empty();
+
+            if user_twofactor_disabled && user_org.atype < UserOrgType::Admin {
+
+                let org = Organization::find_by_uuid(&user_org.org_uuid, &conn).unwrap();
+                let user = User::find_by_uuid(&user_org.user_uuid, &conn).unwrap();
+
+                mail::send_2fa_removed_from_org(&user.email, &org.name)?;
+                user_org.delete(&conn)?;
+            }
+        }        
+    }
 
     let mut policy = match OrgPolicy::find_by_org_and_type(&org_id, pol_type, &conn) {
         Some(p) => p,

src/api/core/two_factor/mod.rs

@@ -8,9 +8,10 @@ use crate::{
     auth::Headers,
     crypto,
     db::{
-        models::{TwoFactor, User},
+        models::*,
         DbConn,
     },
+    mail,
 };
 
 pub mod authenticator;
@@ -134,6 +135,23 @@ fn disable_twofactor(data: JsonUpcase<DisableTwoFactorData>, headers: Headers, c
         twofactor.delete(&conn)?;
     }
 
+    let twofactor_disabled = TwoFactor::find_by_user(&user.uuid, &conn).is_empty();
+
+    if twofactor_disabled {
+        let policy_type = OrgPolicyType::TwoFactorAuthentication;
+        let org_list = UserOrganization::find_by_user_and_policy(&user.uuid, policy_type, &conn);
+
+        for user_org in org_list.into_iter() {
+
+            if user_org.atype < UserOrgType::Admin {
+                let org = Organization::find_by_uuid(&user_org.org_uuid, &conn).unwrap();
+
+                mail::send_2fa_removed_from_org(&user.email, &org.name)?;
+                user_org.delete(&conn)?;
+            }
+        }
+    }
+
     Ok(Json(json!({
         "Enabled": false,
         "Type": type_,

src/config.rs

@@ -842,6 +842,7 @@ where
     reg!("email/new_device_logged_in", ".html");
     reg!("email/pw_hint_none", ".html");
     reg!("email/pw_hint_some", ".html");
+    reg!("email/send_2fa_removed_from_org", ".html");
     reg!("email/send_org_invite", ".html");
     reg!("email/twofactor_email", ".html");
     reg!("email/verify_email", ".html");

src/db/models/org_policy.rs

@@ -22,6 +22,7 @@ db_object! {
 
 #[derive(Copy, Clone)]
 #[derive(num_derive::FromPrimitive)]
+#[derive(PartialEq)]
 pub enum OrgPolicyType {
     TwoFactorAuthentication = 0,
     MasterPassword = 1,

src/db/models/organization.rs

@@ -2,7 +2,7 @@ use serde_json::Value;
 use std::cmp::Ordering;
 use num_traits::FromPrimitive;
 
-use super::{CollectionUser, User, OrgPolicy};
+use super::{CollectionUser, User, OrgPolicy, OrgPolicyType};
 
 db_object! {
     #[derive(Identifiable, Queryable, Insertable, AsChangeset)]
@@ -538,6 +538,25 @@ impl UserOrganization {
         }}
     }
 
+    pub fn find_by_user_and_policy(user_uuid: &str, policy_type: OrgPolicyType, conn: &DbConn) -> Vec<Self> {
+        db_run! { conn: {
+            users_organizations::table
+                .inner_join(
+                    org_policies::table.on(
+                        org_policies::org_uuid.eq(users_organizations::org_uuid)
+                            .and(users_organizations::user_uuid.eq(user_uuid))
+                            .and(org_policies::atype.eq(policy_type as i32))
+                            .and(org_policies::enabled.eq(true)))
+                )
+                .filter(
+                    users_organizations::status.eq(UserOrgStatus::Confirmed as i32)
+                )
+                .select(users_organizations::all_columns)
+                .load::<UserOrganizationDb>(conn)
+                .unwrap_or_default().from_db()
+        }}
+    }
+
     pub fn find_by_cipher_and_org(cipher_uuid: &str, org_uuid: &str, conn: &DbConn) -> Vec<Self> {
         db_run! { conn: {
             users_organizations::table

src/mail.rs

@@ -179,6 +179,22 @@ pub fn send_welcome_must_verify(address: &str, uuid: &str) -> EmptyResult {
     send_email(address, &subject, body_html, body_text)
 }
 
+pub fn send_2fa_removed_from_org(
+    address: &str,
+    org_name: &str,
+) -> EmptyResult {
+
+    let (subject, body_html, body_text) = get_text(
+        "email/send_2fa_removed_from_org",
+        json!({
+            "url": CONFIG.domain(),
+            "org_name": org_name,
+        }),
+    )?;
+
+    send_email(address, &subject, body_html, body_text)
+}
+
 pub fn send_invite(
     address: &str,
     uuid: &str,

src/static/templates/email/send_2fa_removed_from_org.hbs

@@ -0,0 +1,9 @@
+Removed from {{{org_name}}}
+<!---------------->
+You have been removed from organization *{{org_name}}* because your account does not have Two-step Login enabled.
+
+
+You can enable Two-step Login in your account settings.
+
+===
+Github: https://github.com/dani-garcia/bitwarden_rs

src/static/templates/email/send_2fa_removed_from_org.html.hbs

@@ -0,0 +1,129 @@
+Removed from {{{org_name}}}
+<!---------------->
+<html xmlns="http://www.w3.org/1999/xhtml" xmlns="http://www.w3.org/1999/xhtml" style="-webkit-font-smoothing: antialiased; -webkit-text-size-adjust: none; box-sizing: border-box; color: #333; font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif; font-size: 16px; line-height: 25px; margin: 0;">
+   <head>
+      <meta name="viewport" content="width=device-width" />
+      <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
+      <title>Bitwarden_rs</title>
+   </head>
+   <body style="-webkit-font-smoothing: antialiased; -webkit-text-size-adjust: none; height: 100%; line-height: 25px; width: 100% !important;" bgcolor="#f6f6f6">
+      <style type="text/css">
+          body {
+         margin: 0;
+         font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
+         box-sizing: border-box;
+         font-size: 16px;
+         color: #333;
+         line-height: 25px;
+         -webkit-font-smoothing: antialiased;
+         -webkit-text-size-adjust: none;
+         }
+         body * {
+         margin: 0;
+         font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
+         box-sizing: border-box;
+         font-size: 16px;
+         color: #333;
+         line-height: 25px;
+         -webkit-font-smoothing: antialiased;
+         -webkit-text-size-adjust: none;
+         }
+         img {
+         max-width: 100%;
+         border: none;
+         }
+         body {
+         -webkit-font-smoothing: antialiased;
+         -webkit-text-size-adjust: none;
+         width: 100% !important;
+         height: 100%;
+         line-height: 25px;
+         }
+         body {
+         background-color: #f6f6f6;
+         }
+         @media only screen and (max-width: 600px) {
+         body {
+         padding: 0 !important;
+         }
+         .container {
+         padding: 0 !important;
+         width: 100% !important;
+         }
+         .container-table {
+         padding: 0 !important;
+         width: 100% !important;
+         }
+         .content {
+         padding: 0 0 10px 0 !important;
+         }
+         .content-wrap {
+         padding: 10px !important;
+         }
+         .invoice {
+         width: 100% !important;
+         }
+         .main {
+         border-right: none !important;
+         border-left: none !important;
+         border-radius: 0 !important;
+         }
+         .logo {
+         padding-top: 10px !important;
+         }
+         .footer {
+         margin-top: 10px !important;
+         }
+         .indented {
+         padding-left: 10px;
+         }
+         }
+      </style>
+      <table class="body-wrap" cellpadding="0" cellspacing="0" style="-webkit-font-smoothing: antialiased; -webkit-text-size-adjust: none; box-sizing: border-box; color: #333; font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif; font-size: 16px; line-height: 25px; margin: 0; width: 100%;" bgcolor="#f6f6f6">
+         <tr style="-webkit-font-smoothing: antialiased; -webkit-text-size-adjust: none; box-sizing: border-box; color: #333; font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif; font-size: 16px; line-height: 25px; margin: 0;">
+            <td valign="middle" class="aligncenter middle logo" style="-webkit-font-smoothing: antialiased; -webkit-text-size-adjust: none; box-sizing: border-box; color: #333; font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif; font-size: 16px; line-height: 25px; margin: 0; padding: 20px 0 10px;" align="center">
+                <img src="{{url}}/bwrs_static/logo-gray.png" alt="" width="250" height="39" style="-webkit-font-smoothing: antialiased; -webkit-text-size-adjust: none; border: none; box-sizing: border-box; color: #333; font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif; font-size: 16px; line-height: 25px; margin: 0; max-width: 100%;" />
+            </td>
+         </tr>
+         <tr style="-webkit-font-smoothing: antialiased; -webkit-text-size-adjust: none; box-sizing: border-box; color: #333; font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif; font-size: 16px; line-height: 25px; margin: 0;">
+            <td class="container" align="center" style="-webkit-font-smoothing: antialiased; -webkit-text-size-adjust: none; box-sizing: border-box; clear: both !important; color: #333; display: block !important; font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif; font-size: 16px; line-height: 25px; margin: 0 auto; max-width: 600px !important; width: 600px;" valign="top">
+               <table cellpadding="0" cellspacing="0" class="container-table" style="-webkit-font-smoothing: antialiased; -webkit-text-size-adjust: none; box-sizing: border-box; clear: both !important; color: #333; display: block !important; font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif; font-size: 16px; line-height: 25px; margin: 0 auto; max-width: 600px !important; width: max-content;">
+                  <tr style="-webkit-font-smoothing: antialiased; -webkit-text-size-adjust: none; box-sizing: border-box; color: #333; font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif; font-size: 16px; line-height: 25px; margin: 0;">
+                     <td class="content" align="center" style="-webkit-font-smoothing: antialiased; -webkit-text-size-adjust: none; box-sizing: border-box; color: #333; display: block; font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif; font-size: 0; line-height: 0; margin: 0 auto; max-width: 600px; padding-bottom: 20px;" valign="top">
+                        <table class="main" width="100%" cellpadding="0" cellspacing="0" style="font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif; box-sizing: border-box; font-size: 16px; color: #333; line-height: 25px; -webkit-font-smoothing: antialiased; margin: 0; -webkit-text-size-adjust: none; border: 1px solid #e9e9e9; border-radius: 3px;" bgcolor="white">
+                           <tr style="margin: 0; font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif; box-sizing: border-box; font-size: 16px; color: #333; line-height: 25px; -webkit-font-smoothing: antialiased; -webkit-text-size-adjust: none;">
+                              <td class="content-wrap" style="font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif; box-sizing: border-box; font-size: 16px; color: #333; line-height: 25px; margin: 0; -webkit-font-smoothing: antialiased; padding: 20px; -webkit-text-size-adjust: none;" valign="top">
+                                 <table width="100%" cellpadding="0" cellspacing="0" style="margin: 0; font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif; box-sizing: border-box; font-size: 16px; color: #333; line-height: 25px; -webkit-font-smoothing: antialiased; -webkit-text-size-adjust: none;">
+                                    <tr style="margin: 0; font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif; box-sizing: border-box; font-size: 16px; color: #333; line-height: 25px; -webkit-font-smoothing: antialiased; -webkit-text-size-adjust: none;">
+                                       <td class="content-block" style="font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif; box-sizing: border-box; font-size: 16px; color: #333; line-height: 25px; margin: 0; -webkit-font-smoothing: antialiased; padding: 0 0 10px; -webkit-text-size-adjust: none; text-align: center;" valign="top" align="center">
+                                          You have been removed from organization <b style="margin: 0; font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif; box-sizing: border-box; font-size: 16px; color: #333; line-height: 25px; -webkit-font-smoothing: antialiased; -webkit-text-size-adjust: none;">{{org_name}}</b> because your account does not have Two-step Login enabled.
+                                       </td>
+                                    </tr>
+                                    <tr style="margin: 0; font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif; box-sizing: border-box; font-size: 16px; color: #333; line-height: 25px; -webkit-font-smoothing: antialiased; -webkit-text-size-adjust: none;">
+                                       <td class="content-block last" style="font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif; box-sizing: border-box; font-size: 16px; color: #333; line-height: 25px; margin: 0; -webkit-font-smoothing: antialiased; padding: 0; -webkit-text-size-adjust: none; text-align: center;" valign="top" align="center">
+                                          You can enable Two-step Login in your account settings.
+                                       </td>
+                                    </tr>
+                                 </table>
+                              </td>
+                           </tr>
+                        </table>
+                        <table class="footer" cellpadding="0" cellspacing="0" width="100%" style="-webkit-font-smoothing: antialiased; -webkit-text-size-adjust: none; box-sizing: border-box; clear: both; color: #999; font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif; font-size: 12px; line-height: 20px; margin: 0; width: 100%;">
+                           <tr style="-webkit-font-smoothing: antialiased; -webkit-text-size-adjust: none; box-sizing: border-box; color: #333; font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif; font-size: 16px; line-height: 25px; margin: 0;">
+                              <td class="aligncenter social-icons" align="center" style="-webkit-font-smoothing: antialiased; -webkit-text-size-adjust: none; box-sizing: border-box; color: #999; font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif; font-size: 12px; line-height: 20px; margin: 0; padding: 15px 0 0 0;" valign="top">
+                                 <table cellpadding="0" cellspacing="0" style="-webkit-font-smoothing: antialiased; -webkit-text-size-adjust: none; box-sizing: border-box; color: #333; font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif; font-size: 16px; line-height: 25px; margin: 0 auto;">
+                                    <tr style="-webkit-font-smoothing: antialiased; -webkit-text-size-adjust: none; box-sizing: border-box; color: #333; font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif; font-size: 16px; line-height: 25px; margin: 0;">
+                                        <td style="-webkit-font-smoothing: antialiased; -webkit-text-size-adjust: none; box-sizing: border-box; color: #999; font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif; font-size: 12px; line-height: 20px; margin: 0; padding: 0 10px;" valign="top"><a href="https://github.com/dani-garcia/bitwarden_rs" target="_blank" style="-webkit-font-smoothing: antialiased; -webkit-text-size-adjust: none; box-sizing: border-box; color: #999; font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif; font-size: 12px; line-height: 20px; margin: 0; text-decoration: underline;"><img src="{{url}}/bwrs_static/mail-github.png" alt="GitHub" width="30" height="30" style="-webkit-font-smoothing: antialiased; -webkit-text-size-adjust: none; border: none; box-sizing: border-box; color: #333; font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif; font-size: 16px; line-height: 25px; margin: 0; max-width: 100%;" /></a></td>
+                                    </tr>
+                                 </table>
+                              </td>
+                           </tr>
+                        </table>
+                     </td>
+                  </tr>
+               </table>
+            </td>
+         </tr>
+      </table>
+   </body>
+</html>