Merge pull request #137 from stammw/master

SMTP implementation, along with password HINT email

.env

@@ -41,3 +41,10 @@
 # ROCKET_ADDRESS=0.0.0.0 # Enable this to test mobile app
 # ROCKET_PORT=8000
 # ROCKET_TLS={certs="/path/to/certs.pem",key="/path/to/key.pem"}
+
+## Mail specific settings, if SMTP_HOST is specified, SMTP_USERNAME and SMTP_PASSWORD are mandatory
+# SMTP_HOST=smtp.domain.tld
+# SMTP_PORT=587
+# SMTP_SSL=true
+# SMTP_USERNAME=username
+# SMTP_PASSWORD=password

Cargo.toml

@@ -58,6 +58,11 @@ lazy_static = "1.1.0"
 num-traits = "0.2.5"
 num-derive = "0.2.2"
 
+lettre = "0.8.2"
+lettre_email = "0.8.2"
+native-tls = "0.1.5"
+fast_chemail = "0.9.5"
+
 [patch.crates-io]
  # Make jwt use ring 0.11, to match rocket
 jsonwebtoken = { path = "libs/jsonwebtoken" }

src/api/core/accounts.rs

@@ -5,6 +5,8 @@ use db::models::*;
 
 use api::{PasswordData, JsonResult, EmptyResult, JsonUpcase, NumberOrString};
 use auth::Headers;
+use fast_chemail::is_valid_email;
+use mail;
 
 use CONFIG;
 
@@ -85,7 +87,10 @@ fn post_profile(data: JsonUpcase<ProfileData>, headers: Headers, conn: DbConn) -
     let mut user = headers.user;
 
     user.name = data.Name;
-    user.password_hint = data.MasterPasswordHint;
+    user.password_hint = match data.MasterPasswordHint {
+        Some(ref h) if h.is_empty() => None,
+        _ => data.MasterPasswordHint,
+    };
     user.save(&conn);
 
     Ok(Json(user.to_json(&conn)))
@@ -263,17 +268,29 @@ struct PasswordHintData {
 fn password_hint(data: JsonUpcase<PasswordHintData>, conn: DbConn) -> EmptyResult {
     let data: PasswordHintData = data.into_inner().data;
 
-    if !CONFIG.show_password_hint {
-        return Ok(())
+    if !is_valid_email(&data.Email) {
+        return err!("This email address is not valid...");
     }
 
-    match User::find_by_mail(&data.Email, &conn) {
-        Some(user) => {
-            let hint = user.password_hint.to_owned().unwrap_or_default();
-            err!(format!("Your password hint is: {}", hint))
-        },
-        None => Ok(()),
+    let user = User::find_by_mail(&data.Email, &conn);
+    if user.is_none() {
+        return Ok(());
     }
+
+    let user = user.unwrap();
+    if let Some(ref mail_config) = CONFIG.mail {
+        if let Err(e) = mail::send_password_hint(&user.email, user.password_hint, mail_config) {
+            err!(format!("There have been a problem sending the email: {}", e));
+        }
+    } else if CONFIG.show_password_hint {
+        if let Some(hint) = user.password_hint {
+            err!(format!("Your password hint is: {}", &hint));
+        } else {
+            err!(format!("Sorry, you have no password hint..."));
+        }
+    }
+
+    Ok(())
 }
 
 #[derive(Deserialize)]

src/mail.rs

@@ -0,0 +1,63 @@
+use std::error::Error;
+use native_tls::{Protocol, TlsConnector};
+use lettre::{EmailTransport, SmtpTransport, ClientTlsParameters, ClientSecurity};
+use lettre::smtp::{ConnectionReuseParameters, SmtpTransportBuilder};
+use lettre::smtp::authentication::Credentials;
+use lettre_email::EmailBuilder;
+
+use MailConfig;
+
+fn mailer(config: &MailConfig) -> SmtpTransport {
+    let client_security = if config.smtp_ssl {
+        let mut tls_builder = TlsConnector::builder().unwrap();
+        tls_builder.supported_protocols(&[Protocol::Tlsv11, Protocol::Tlsv12]).unwrap();
+        ClientSecurity::Required(
+            ClientTlsParameters::new(config.smtp_host.to_owned(), tls_builder.build().unwrap())
+        )
+    } else {
+        ClientSecurity::None
+    };
+
+    let smtp_transport = SmtpTransportBuilder::new(
+        (config.smtp_host.to_owned().as_str(), config.smtp_port),
+        client_security
+    ).unwrap();
+
+    let smtp_transport = match (&config.smtp_username, &config.smtp_password) {
+        (Some(username), Some(password)) => {
+            smtp_transport.credentials(Credentials::new(username.to_owned(), password.to_owned()))
+        },
+        (_, _) => smtp_transport,
+    };
+
+    smtp_transport
+        .smtp_utf8(true)
+        .connection_reuse(ConnectionReuseParameters::NoReuse)
+        .build()
+}
+
+pub fn send_password_hint(address: &str, hint: Option<String>, config: &MailConfig) -> Result<(), String> {
+    let (subject, body) = if let Some(hint) = hint {
+        ("Your master password hint",
+         format!(
+            "You (or someone) recently requested your master password hint.\n\n\
+             Your hint is:  \"{}\"\n\n\
+             If you did not request your master password hint you can safely ignore this email.\n",
+            hint))
+    } else {
+        ("Sorry, you have no password hint...",
+         "Sorry, you have not specified any password hint...\n".to_string())
+    };
+
+    let email = EmailBuilder::new()
+        .to(address)
+        .from((config.smtp_from.to_owned(), "Bitwarden-rs"))
+        .subject(subject)
+        .body(body)
+        .build().unwrap();
+
+    match mailer(config).send(&email) {
+        Ok(_) => Ok(()),
+        Err(e) => Err(e.description().to_string()),
+    }
+}

src/main.rs

@@ -27,6 +27,10 @@ extern crate lazy_static;
 #[macro_use]
 extern crate num_derive;
 extern crate num_traits;
+extern crate lettre;
+extern crate lettre_email;
+extern crate native_tls;
+extern crate fast_chemail;
 
 use std::{env, path::Path, process::{exit, Command}};
 use rocket::Rocket;
@@ -38,6 +42,7 @@ mod api;
 mod db;
 mod crypto;
 mod auth;
+mod mail;
 
 fn init_rocket() -> Rocket {
     rocket::ignite()
@@ -155,6 +160,57 @@ lazy_static! {
     static ref CONFIG: Config = Config::load();
 }
 
+#[derive(Debug)]
+pub struct MailConfig {
+    smtp_host: String,
+    smtp_port: u16,
+    smtp_ssl: bool,
+    smtp_from: String,
+    smtp_username: Option<String>,
+    smtp_password: Option<String>,
+}
+
+impl MailConfig {
+    fn load() -> Option<Self> {
+        let smtp_host = env::var("SMTP_HOST").ok();
+        
+        // When SMTP_HOST is absent, we assume the user does not want to enable it.
+        if smtp_host.is_none() {
+            return None
+        }
+
+        let smtp_ssl = util::parse_option_string(env::var("SMTP_SSL").ok()).unwrap_or(true);
+        let smtp_port = util::parse_option_string(env::var("SMTP_PORT").ok())
+            .unwrap_or_else(|| {
+                if smtp_ssl {
+                    587u16
+                } else {
+                    25u16
+                }
+            });
+
+        let smtp_username = env::var("SMTP_USERNAME").ok();
+        let smtp_password = env::var("SMTP_PASSWORD").ok().or_else(|| {
+            if smtp_username.as_ref().is_some() {
+                println!("Please specify SMTP_PASSWORD to enable SMTP support.");
+                exit(1);
+            } else {
+                None
+            }
+        });
+
+        Some(MailConfig {
+            smtp_host: smtp_host.unwrap(),
+            smtp_port: smtp_port,
+            smtp_ssl: smtp_ssl,
+            smtp_from: util::parse_option_string(env::var("SMTP_FROM").ok())
+                .unwrap_or("bitwarden-rs@localhost".to_string()),
+            smtp_username: smtp_username,
+            smtp_password: smtp_password,
+        })
+    }
+}
+
 #[derive(Debug)]
 pub struct Config {
     database_url: String,
@@ -172,8 +228,11 @@ pub struct Config {
     signups_allowed: bool,
     password_iterations: i32,
     show_password_hint: bool,
+
     domain: String,
     domain_set: bool,
+
+    mail: Option<MailConfig>,
 }
 
 impl Config {
@@ -204,6 +263,8 @@ impl Config {
 
             domain_set: domain.is_ok(),
             domain: domain.unwrap_or("http://localhost".into()),
+
+            mail: MailConfig::load(),
         }
     }
 }