Implement public_login

4 files changed, 194 insertions, 74 deletions

diff --git a/src/config.rs b/src/config.rs
index b77288b..a1de5ba 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -23,6 +23,8 @@ pub struct LoginStaticConfig {
 
 #[derive(Deserialize, Debug, Clone)]
 pub struct LoginStaticUser {
+    #[serde(default)]
+    pub email_addresses: Vec<String>,
     pub password: String,
 
     pub aws_access_key_id: String,
diff --git a/src/login/ldap_provider.rs b/src/login/ldap_provider.rs
index c9d23a0..9310e55 100644
--- a/src/login/ldap_provider.rs
+++ b/src/login/ldap_provider.rs
@@ -84,11 +84,30 @@ impl LdapLoginProvider {
             bucket_source,
         })
     }
+
+    fn storage_creds_from_ldap_user(&self, user: &SearchEntry) -> Result<StorageCredentials> {
+        let aws_access_key_id = get_attr(user, &self.aws_access_key_id_attr)?;
+        let aws_secret_access_key = get_attr(user, &self.aws_secret_access_key_attr)?;
+        let bucket = match &self.bucket_source {
+            BucketSource::Constant(b) => b.clone(),
+            BucketSource::Attr(a) => get_attr(user, a)?,
+        };
+
+        Ok(StorageCredentials {
+            k2v_region: self.k2v_region.clone(),
+            s3_region: self.s3_region.clone(),
+            aws_access_key_id,
+            aws_secret_access_key,
+            bucket,
+        })
+    }
 }
 
 #[async_trait]
 impl LoginProvider for LdapLoginProvider {
     async fn login(&self, username: &str, password: &str) -> Result<Credentials> {
+        check_identifier(username)?;
+
         let (conn, mut ldap) = LdapConnAsync::new(&self.ldap_server).await?;
         ldap3::drive!(conn);
 
@@ -97,13 +116,6 @@ impl LoginProvider for LdapLoginProvider {
             ldap.simple_bind(dn, pw).await?.success()?;
         }
 
-        let username_is_ok = username
-            .chars()
-            .all(|c| c.is_alphanumeric() || "-+_.@".contains(c));
-        if !username_is_ok {
-            bail!("Invalid username, must contain only a-z A-Z 0-9 - + _ . @");
-        }
-
         let (matches, _res) = ldap
             .search(
                 &self.search_base,
@@ -137,32 +149,9 @@ impl LoginProvider for LdapLoginProvider {
             .context("Invalid password")?;
         debug!("Ldap login with user name {} successfull", username);
 
-        let get_attr = |attr: &str| -> Result<String> {
-            Ok(user
-                .attrs
-                .get(attr)
-                .ok_or(anyhow!("Missing attr: {}", attr))?
-                .iter()
-                .next()
-                .ok_or(anyhow!("No value for attr: {}", attr))?
-                .clone())
-        };
-        let aws_access_key_id = get_attr(&self.aws_access_key_id_attr)?;
-        let aws_secret_access_key = get_attr(&self.aws_secret_access_key_attr)?;
-        let bucket = match &self.bucket_source {
-            BucketSource::Constant(b) => b.clone(),
-            BucketSource::Attr(a) => get_attr(a)?,
-        };
+        let storage = self.storage_creds_from_ldap_user(&user)?;
 
-        let storage = StorageCredentials {
-            k2v_region: self.k2v_region.clone(),
-            s3_region: self.s3_region.clone(),
-            aws_access_key_id,
-            aws_secret_access_key,
-            bucket,
-        };
-
-        let user_secret = get_attr(&self.user_secret_attr)?;
+        let user_secret = get_attr(&user, &self.user_secret_attr)?;
         let alternate_user_secrets = match &self.alternate_user_secrets_attr {
             None => vec![],
             Some(a) => user.attrs.get(a).cloned().unwrap_or_default(),
@@ -178,4 +167,71 @@ impl LoginProvider for LdapLoginProvider {
 
         Ok(Credentials { storage, keys })
     }
+
+    async fn public_login(&self, email: &str) -> Result<PublicCredentials> {
+        check_identifier(email)?;
+
+        let (dn, pw) = match self.bind_dn_and_pw.as_ref() {
+            Some(x) => x,
+            None => bail!("Missing bind_dn and bind_password in LDAP login provider config"),
+        };
+
+        let (conn, mut ldap) = LdapConnAsync::new(&self.ldap_server).await?;
+        ldap3::drive!(conn);
+        ldap.simple_bind(dn, pw).await?.success()?;
+
+        let (matches, _res) = ldap
+            .search(
+                &self.search_base,
+                Scope::Subtree,
+                &format!(
+                    "(&(objectClass=inetOrgPerson)({}={}))",
+                    self.mail_attr, email
+                ),
+                &self.attrs_to_retrieve,
+            )
+            .await?
+            .success()?;
+
+        if matches.is_empty() {
+            bail!("No such user account");
+        }
+        if matches.len() > 1 {
+            bail!("Multiple matching user accounts");
+        }
+        let user = SearchEntry::construct(matches.into_iter().next().unwrap());
+        debug!("Found matching LDAP user for email {}: {}", email, user.dn);
+
+        let storage = self.storage_creds_from_ldap_user(&user)?;
+        drop(ldap);
+
+        let k2v_client = storage.k2v_client()?;
+        let (_, public_key) = CryptoKeys::load_salt_and_public(&k2v_client).await?;
+
+        Ok(PublicCredentials {
+            storage,
+            public_key,
+        })
+    }
+}
+
+fn get_attr(user: &SearchEntry, attr: &str) -> Result<String> {
+    Ok(user
+        .attrs
+        .get(attr)
+        .ok_or(anyhow!("Missing attr: {}", attr))?
+        .iter()
+        .next()
+        .ok_or(anyhow!("No value for attr: {}", attr))?
+        .clone())
+}
+
+fn check_identifier(id: &str) -> Result<()> {
+    let is_ok = id
+        .chars()
+        .all(|c| c.is_alphanumeric() || "-+_.@".contains(c));
+    if !is_ok {
+        bail!("Invalid username/email address, must contain only a-z A-Z 0-9 - + _ . @");
+    }
+    Ok(())
 }
diff --git a/src/login/mod.rs b/src/login/mod.rs
index 2640a58..c0e9032 100644
--- a/src/login/mod.rs
+++ b/src/login/mod.rs
@@ -24,6 +24,9 @@ pub trait LoginProvider {
     /// The login method takes an account's password as an input to decypher
     /// decryption keys and obtain full access to the user's account.
     async fn login(&self, username: &str, password: &str) -> Result<Credentials>;
+    /// The public_login method takes an account's email address and returns
+    /// public credentials for adding mails to the user's inbox.
+    async fn public_login(&self, email: &str) -> Result<PublicCredentials>;
 }
 
 /// The struct Credentials represent all of the necessary information to interact
@@ -36,6 +39,13 @@ pub struct Credentials {
     pub keys: CryptoKeys,
 }
 
+#[derive(Clone, Debug)]
+pub struct PublicCredentials {
+    /// The storage credentials are used to authenticate access to the underlying storage (S3, K2V)
+    pub storage: StorageCredentials,
+    pub public_key: PublicKey,
+}
+
 /// The struct StorageCredentials contains access key to an S3 and K2V bucket
 #[derive(Clone, Debug)]
 pub struct StorageCredentials {
@@ -396,7 +406,7 @@ impl CryptoKeys {
         Ok((salt_ct, public_ct))
     }
 
-    async fn load_salt_and_public(k2v: &K2vClient) -> Result<([u8; 32], PublicKey)> {
+    pub async fn load_salt_and_public(k2v: &K2vClient) -> Result<([u8; 32], PublicKey)> {
         let mut params = k2v
             .read_batch(&[
                 k2v_read_single_key("keys", "salt", false),
diff --git a/src/login/static_provider.rs b/src/login/static_provider.rs
index cc6ffb6..aa5e499 100644
--- a/src/login/static_provider.rs
+++ b/src/login/static_provider.rs
@@ -1,4 +1,5 @@
 use std::collections::HashMap;
+use std::sync::Arc;
 
 use anyhow::{anyhow, bail, Result};
 use async_trait::async_trait;
@@ -10,16 +11,34 @@ use crate::login::*;
 
 pub struct StaticLoginProvider {
     default_bucket: Option<String>,
-    users: HashMap<String, LoginStaticUser>,
+    users: HashMap<String, Arc<LoginStaticUser>>,
+    users_by_email: HashMap<String, Arc<LoginStaticUser>>,
+
     k2v_region: Region,
     s3_region: Region,
 }
 
 impl StaticLoginProvider {
     pub fn new(config: LoginStaticConfig, k2v_region: Region, s3_region: Region) -> Result<Self> {
+        let users = config
+            .users
+            .into_iter()
+            .map(|(k, v)| (k, Arc::new(v)))
+            .collect::<HashMap<_, _>>();
+        let mut users_by_email = HashMap::new();
+        for (_, u) in users.iter() {
+            for m in u.email_addresses.iter() {
+                if users_by_email.contains_key(m) {
+                    bail!("Several users have same email address: {}", m);
+                }
+                users_by_email.insert(m.clone(), u.clone());
+            }
+        }
+
         Ok(Self {
             default_bucket: config.default_bucket,
-            users: config.users,
+            users,
+            users_by_email,
             k2v_region,
             s3_region,
         })
@@ -29,49 +48,82 @@ impl StaticLoginProvider {
 #[async_trait]
 impl LoginProvider for StaticLoginProvider {
     async fn login(&self, username: &str, password: &str) -> Result<Credentials> {
-        match self.users.get(username) {
+        let user = match self.users.get(username) {
             None => bail!("User {} does not exist", username),
-            Some(u) => {
-                if !verify_password(password, &u.password)? {
-                    bail!("Wrong password");
-                }
-                let bucket = u
-                    .bucket
-                    .clone()
-                    .or_else(|| self.default_bucket.clone())
-                    .ok_or(anyhow!(
-                        "No bucket configured and no default bucket specieid"
-                    ))?;
-
-                let storage = StorageCredentials {
-                    k2v_region: self.k2v_region.clone(),
-                    s3_region: self.s3_region.clone(),
-                    aws_access_key_id: u.aws_access_key_id.clone(),
-                    aws_secret_access_key: u.aws_secret_access_key.clone(),
-                    bucket,
-                };
+            Some(u) => u,
+        };
 
-                let keys = match (&u.master_key, &u.secret_key) {
-                    (Some(m), Some(s)) => {
-                        let master_key = Key::from_slice(&base64::decode(m)?)
-                            .ok_or(anyhow!("Invalid master key"))?;
-                        let secret_key = SecretKey::from_slice(&base64::decode(s)?)
-                            .ok_or(anyhow!("Invalid secret key"))?;
-                        CryptoKeys::open_without_password(&storage, &master_key, &secret_key).await?
-                    }
-                    (None, None) => {
-                        let user_secrets = UserSecrets {
-                            user_secret: u.user_secret.clone(),
-                            alternate_user_secrets: u.alternate_user_secrets.clone(),
-                        };
-                        CryptoKeys::open(&storage, &user_secrets, password).await?
-                    }
-                    _ => bail!("Either both master and secret key or none of them must be specified for user"),
-                };
+        if !verify_password(password, &user.password)? {
+            bail!("Wrong password");
+        }
+        let bucket = user
+            .bucket
+            .clone()
+            .or_else(|| self.default_bucket.clone())
+            .ok_or(anyhow!(
+                "No bucket configured and no default bucket specieid"
+            ))?;
 
-                Ok(Credentials { storage, keys })
+        let storage = StorageCredentials {
+            k2v_region: self.k2v_region.clone(),
+            s3_region: self.s3_region.clone(),
+            aws_access_key_id: user.aws_access_key_id.clone(),
+            aws_secret_access_key: user.aws_secret_access_key.clone(),
+            bucket,
+        };
+
+        let keys = match (&user.master_key, &user.secret_key) {
+            (Some(m), Some(s)) => {
+                let master_key =
+                    Key::from_slice(&base64::decode(m)?).ok_or(anyhow!("Invalid master key"))?;
+                let secret_key = SecretKey::from_slice(&base64::decode(s)?)
+                    .ok_or(anyhow!("Invalid secret key"))?;
+                CryptoKeys::open_without_password(&storage, &master_key, &secret_key).await?
             }
-        }
+            (None, None) => {
+                let user_secrets = UserSecrets {
+                    user_secret: user.user_secret.clone(),
+                    alternate_user_secrets: user.alternate_user_secrets.clone(),
+                };
+                CryptoKeys::open(&storage, &user_secrets, password).await?
+            }
+            _ => bail!(
+                "Either both master and secret key or none of them must be specified for user"
+            ),
+        };
+
+        Ok(Credentials { storage, keys })
+    }
+
+    async fn public_login(&self, email: &str) -> Result<PublicCredentials> {
+        let user = match self.users_by_email.get(email) {
+            None => bail!("No user for email address {}", email),
+            Some(u) => u,
+        };
+
+        let bucket = user
+            .bucket
+            .clone()
+            .or_else(|| self.default_bucket.clone())
+            .ok_or(anyhow!(
+                "No bucket configured and no default bucket specieid"
+            ))?;
+
+        let storage = StorageCredentials {
+            k2v_region: self.k2v_region.clone(),
+            s3_region: self.s3_region.clone(),
+            aws_access_key_id: user.aws_access_key_id.clone(),
+            aws_secret_access_key: user.aws_secret_access_key.clone(),
+            bucket,
+        };
+
+        let k2v_client = storage.k2v_client()?;
+        let (_, public_key) = CryptoKeys::load_salt_and_public(&k2v_client).await?;
+
+        Ok(PublicCredentials {
+            storage,
+            public_key,
+        })
     }
 }