start refactor of auth code

Pulls auth code (which requires the persistent state of a signing
keyring) into a struct.

Doesn't try verify macaroon in middleware, do it in individual wrappers.

1 files changed, 110 insertions, 183 deletions

diff --git a/rust/src/auth.rs b/rust/src/auth.rs
index 580cde28..c188233a 100644
--- a/rust/src/auth.rs
+++ b/rust/src/auth.rs
@@ -1,208 +1,151 @@
 //! Editor bearer token authentication
 
-use swagger::auth::{AuthData, Authorization, Scopes};
+use swagger::auth::AuthData;
 use macaroon::{Format, Macaroon, Verifier};
 use data_encoding::BASE64;
 
-use std::collections::BTreeSet;
-use std::fmt;
+use std::collections::{BTreeSet,HashMap};
 use database_models::*;
 use database_schema::*;
 use api_helpers::*;
 use chrono::prelude::*;
 use diesel;
-use iron;
 use diesel::prelude::*;
 use errors::*;
-//use serde_json;
 use std::str::FromStr;
-//use uuid::Uuid;
 
 // 32 bytes max (!)
 static DUMMY_KEY: &[u8] = b"dummy-key-a-one-two-three-a-la";
 
-#[derive(Debug)]
-pub struct OpenAuthMiddleware;
-
-#[derive(Debug)]
-pub struct AuthError {
-    msg: String,
+#[derive(Clone)]
+pub struct AuthContext {
+    pub editor_id: FatCatId,
+    editor_row: EditorRow,
+    roles: Vec<String>, // TODO: BTreeSet
 }
 
-impl fmt::Display for AuthError {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        write!(f, "AuthError: {}", &self.msg)
-    }
-}
+impl AuthContext {
 
-impl iron::Error for AuthError {
-    fn description(&self) -> &str {
-        &self.msg
-    }
-    fn cause(&self) -> Option<&iron::Error> {
-        None
+    pub fn has_role(&self, role: &str) -> bool {
+        self.roles.contains(&role.to_string()) || self.roles.contains(&"admin".to_string())
     }
 }
 
-/*
-#[derive(Debug)]
-pub struct FatcatAuthBakery {
-    root_key_store: bool, // hashmap
-    signing_key: bool, // string name
+#[derive(Clone)]
+pub struct AuthConfectionary {
+    pub root_keys: HashMap<String, [u8; 32]>,
 }
 
-// impl:
-//  - new()
-//  - verify(&str) -> Result<AuthContext>
-*/
-
-fn new_auth_ironerror(m: &str) -> iron::error::IronError {
-    iron::error::IronError::new(
-        AuthError { msg: m.to_string() },
-        (iron::status::BadRequest, m.to_string())
-    )
-}
-
-impl OpenAuthMiddleware {
-    /// Create a middleware that authorizes with the configured subject.
-    pub fn new() -> OpenAuthMiddleware {
-        OpenAuthMiddleware
-    }
-}
-impl iron::middleware::BeforeMiddleware for OpenAuthMiddleware {
-    fn before(&self, req: &mut iron::Request) -> iron::IronResult<()> {
-        req.extensions.insert::<Authorization>(Authorization {
-            subject: "undefined".to_string(),
-            scopes: Scopes::All,
-            issuer: None,
-        });
-        Ok(())
+impl AuthConfectionary {
+    pub fn new() -> AuthConfectionary {
+        AuthConfectionary {
+            root_keys: HashMap::new(),
+        }
     }
-}
 
-#[derive(Debug)]
-pub struct MacaroonAuthMiddleware;
-
-impl MacaroonAuthMiddleware {
+    pub fn create_token(&self, conn: &DbConn, editor_id: FatCatId, expires: Option<DateTime<Utc>>) -> Result<String> {
+        let _ed: EditorRow = editor::table
+            .find(&editor_id.to_uuid())
+            .get_result(conn)?;
+        let mut mac = Macaroon::create("fatcat.wiki", DUMMY_KEY, "dummy-key").expect("Macaroon creation");
+        mac.add_first_party_caveat(&format!("editor_id = {}", editor_id.to_string()));
+        // TODO: put created one second in the past to prevent timing synchronization glitches?
+        let now = Utc::now().to_rfc3339_opts(SecondsFormat::Secs, true);
+        mac.add_first_party_caveat(&format!("created = {}", now));
+        if let Some(expires) = expires {
+            mac.add_first_party_caveat(&format!("expires = {:?}",
+                &expires.to_rfc3339_opts(SecondsFormat::Secs, true)));
+        };
+        let raw = mac.serialize(Format::V2).expect("macaroon serialization");
+        Ok(BASE64.encode(&raw))
+    }
 
-    pub fn new() -> MacaroonAuthMiddleware {
-        macaroon::initialize().unwrap();
-        MacaroonAuthMiddleware
+    /// On success, returns Some((editor_id, scopes)), where `scopes` is a vector of strings.
+    pub fn parse_macaroon_token(&self, conn: &DbConn, s: &str) -> Result<EditorRow> {
+        let raw = BASE64.decode(s.as_bytes())?;
+        let mac = match Macaroon::deserialize(&raw) {
+            Ok(m) => m,
+            Err(e) => bail!("macaroon deserialize error: {:?}", e),
+        };
+        let mac = match mac.validate() {
+            Ok(m) => m,
+            Err(e) => bail!("macaroon validate error: {:?}", e),
+        };
+        let mut verifier = Verifier::new();
+        let mut editor_id: Option<FatCatId> = None;
+        for caveat in mac.first_party_caveats() {
+            if caveat.predicate().starts_with("editor_id = ") {
+                editor_id = Some(FatCatId::from_str(caveat.predicate().get(12..).unwrap())?);
+                break
+            }
+        }
+        let editor_id = editor_id.expect("expected an editor_id caveat");
+        verifier.satisfy_exact(&format!("editor_id = {}", editor_id.to_string()));
+        let mut created: Option<DateTime<Utc>> = None;
+        for caveat in mac.first_party_caveats() {
+            if caveat.predicate().starts_with("created = ") {
+                created = Some(DateTime::parse_from_rfc3339(caveat.predicate().get(10..).unwrap())
+                    .unwrap()
+                    .with_timezone(&Utc));
+                break
+            }
+        }
+        let created = created.expect("expected a 'created' caveat");
+        verifier.satisfy_exact(&format!("created = {}", created.to_rfc3339_opts(SecondsFormat::Secs, true)));
+        let editor: EditorRow = editor::table
+            .find(&editor_id.to_uuid())
+            .get_result(conn)?;
+        let auth_epoch = DateTime::<Utc>::from_utc(editor.auth_epoch, Utc);
+        if created < auth_epoch {
+            bail!("token created before current auth_epoch (was probably revoked by editor)")
+        }
+        verifier.satisfy_general(|p: &str| -> bool {
+            // not expired (based on expires)
+            if p.starts_with("expires = ") {
+                let expires: DateTime<Utc> = DateTime::parse_from_rfc3339(p.get(12..).unwrap())
+                    .unwrap()
+                    .with_timezone(&Utc);
+                expires < Utc::now()
+            } else {
+                false
+            }
+        });
+        if !mac.verify_signature(DUMMY_KEY) {
+            bail!("token signature verification failed");
+        };
+        match mac.verify(DUMMY_KEY, &mut verifier) {
+            Ok(true) => (),
+            Ok(false) => bail!("token overall verification failed"),
+            Err(e) => bail!("token parsing failed: {:?}", e),
+        }
+        Ok(editor)
     }
-}
 
-impl iron::middleware::BeforeMiddleware for MacaroonAuthMiddleware {
-    fn before(&self, req: &mut iron::Request) -> iron::IronResult<()> {
+    pub fn parse_swagger(&self, conn: &DbConn, auth_data: &Option<AuthData>) -> Result<Option<AuthContext>> {
 
-        let res: Option<(String, Vec<String>)> = match req.extensions.get::<AuthData>() {
+        let token: Option<String> = match auth_data {
             Some(AuthData::ApiKey(header)) => {
                 let header: Vec<String> = header.split_whitespace().map(|s| s.to_string()).collect();
                 if !(header.len() == 2 && header[0] == "Bearer") {
-                    return Err(new_auth_ironerror("invalid bearer auth HTTP Header"));
+                    bail!("invalid Bearer Auth HTTP header");
                 }
-                sniff_macaroon_token(&header[1]).expect("valid macaroon")
+                Some(header[1].clone())
             },
             None => None,
-            _ => {
-                return Err(new_auth_ironerror("auth HTTP Header should be empty or API key"));
-            }
+            _ => bail!("Authentication HTTP Header should either be empty or a Beaerer API key"),
         };
-        if let Some((editor_id, scopes)) = res {
-            let mut scope_set = BTreeSet::new();
-            for s in scopes {
-                scope_set.insert(s);
-            }
-            req.extensions.insert::<Authorization>(Authorization {
-                subject: editor_id,
-                scopes: Scopes::Some(scope_set),
-                issuer: None,
-            });
+        let token = match token {
+            Some(t) => t,
+            None => return Ok(None),
         };
-        Ok(())
-    }
-}
-
-/// Just checks signature and expired time; can't hit database, so nothing else
-pub fn sniff_macaroon_token(s: &str) -> Result<Option<(String,Vec<String>)>> {
-    let raw = BASE64.decode(s.as_bytes())?;
-    let mac = match Macaroon::deserialize(&raw) {
-        Ok(m) => m,
-        Err(e) => bail!("macaroon deserialize error: {:?}", e),
-    };
-    let mac = match mac.validate() {
-        Ok(m) => m,
-        Err(e) => bail!("macaroon validate error: {:?}", e),
-    };
-    let mut editor_id: Option<FatCatId> = None;
-    for caveat in mac.first_party_caveats() {
-        if caveat.predicate().starts_with("editor_id = ") {
-            editor_id = Some(FatCatId::from_str(caveat.predicate().get(12..).unwrap())?);
-            break
-        }
-    }
-    let editor_id = editor_id.expect("expected an editor_id caveat");
-    Ok(Some((editor_id.to_string(), vec![])))
-}
-
-/// On success, returns Some((editor_id, scopes)), where `scopes` is a vector of strings.
-pub fn parse_macaroon_token(conn: &DbConn, s: &str) -> Result<Option<(String,Vec<String>)>> {
-    let raw = BASE64.decode(s.as_bytes())?;
-    let mac = match Macaroon::deserialize(&raw) {
-        Ok(m) => m,
-        Err(e) => bail!("macaroon deserialize error: {:?}", e),
-    };
-    let mac = match mac.validate() {
-        Ok(m) => m,
-        Err(e) => bail!("macaroon validate error: {:?}", e),
-    };
-    let mut verifier = Verifier::new();
-    let mut editor_id: Option<FatCatId> = None;
-    for caveat in mac.first_party_caveats() {
-        if caveat.predicate().starts_with("editor_id = ") {
-            editor_id = Some(FatCatId::from_str(caveat.predicate().get(12..).unwrap())?);
-            break
-        }
-    }
-    let editor_id = editor_id.expect("expected an editor_id caveat");
-    verifier.satisfy_exact(&format!("editor_id = {}", editor_id.to_string()));
-    let mut created: Option<DateTime<Utc>> = None;
-    for caveat in mac.first_party_caveats() {
-        if caveat.predicate().starts_with("created = ") {
-            created = Some(DateTime::parse_from_rfc3339(caveat.predicate().get(10..).unwrap())
-                .unwrap()
-                .with_timezone(&Utc));
-            break
-        }
-    }
-    let created = created.expect("expected a 'created' caveat");
-    verifier.satisfy_exact(&format!("created = {}", created.to_rfc3339_opts(SecondsFormat::Secs, true)));
-    let editor: EditorRow = editor::table
-        .find(&editor_id.to_uuid())
-        .get_result(conn)?;
-    let auth_epoch = DateTime::<Utc>::from_utc(editor.auth_epoch, Utc);
-    if created < auth_epoch {
-        bail!("token created before current auth_epoch (was probably revoked by editor)")
+        let editor_row = self.parse_macaroon_token(conn, &token)?;
+        let roles = if editor_row.is_admin { vec!["admin".to_string()] } else { vec![] };
+        Ok(Some(AuthContext {
+            editor_id: FatCatId::from_uuid(&editor_row.id),
+            editor_row: editor_row,
+            roles: roles,
+        }))
     }
-    verifier.satisfy_general(|p: &str| -> bool {
-        // not expired (based on expires)
-        if p.starts_with("expires = ") {
-            let expires: DateTime<Utc> = DateTime::parse_from_rfc3339(p.get(12..).unwrap())
-                .unwrap()
-                .with_timezone(&Utc);
-            expires < Utc::now()
-        } else {
-            false
-        }
-    });
-    if !mac.verify_signature(DUMMY_KEY) {
-        bail!("token signature verification failed");
-    };
-    match mac.verify(DUMMY_KEY, &mut verifier) {
-        Ok(true) => (),
-        Ok(false) => bail!("token overall verification failed"),
-        Err(e) => bail!("token parsing failed: {:?}", e),
-    }
-    Ok(Some((editor_id.to_string(), vec![])))
 }
 
 pub fn print_editors(conn: &DbConn) -> Result<()>{
@@ -236,23 +179,6 @@ pub fn create_editor(conn: &DbConn, username: String, is_admin: bool, is_bot: bo
     Ok(ed) 
 }
 
-pub fn create_token(conn: &DbConn, editor_id: FatCatId, expires: Option<DateTime<Utc>>) -> Result<String> {
-    let _ed: EditorRow = editor::table
-        .find(&editor_id.to_uuid())
-        .get_result(conn)?;
-    let mut mac = Macaroon::create("fatcat.wiki", DUMMY_KEY, "dummy-key").expect("Macaroon creation");
-    mac.add_first_party_caveat(&format!("editor_id = {}", editor_id.to_string()));
-    // TODO: put created one second in the past to prevent timing synchronization glitches?
-    let now = Utc::now().to_rfc3339_opts(SecondsFormat::Secs, true);
-    mac.add_first_party_caveat(&format!("created = {}", now));
-    if let Some(expires) = expires {
-        mac.add_first_party_caveat(&format!("expires = {:?}",
-            &expires.to_rfc3339_opts(SecondsFormat::Secs, true)));
-    };
-    let raw = mac.serialize(Format::V2).expect("macaroon serialization");
-    Ok(BASE64.encode(&raw))
-}
-
 pub fn inspect_token(conn: &DbConn, token: &str) -> Result<()> {
     let raw = BASE64.decode(token.as_bytes())?;
     let mac = match Macaroon::deserialize(&raw) {
@@ -266,8 +192,9 @@ pub fn inspect_token(conn: &DbConn, token: &str) -> Result<()> {
     for caveat in mac.first_party_caveats() {
         println!("caveat: {}", caveat.predicate());
     }
+    let ac = AuthConfectionary::new();
     // TODO: don't display full stacktrace on failure
-    println!("verify: {:?}", parse_macaroon_token(conn, token));
+    println!("verify: {:?}", ac.parse_macaroon_token(conn, token));
     Ok(())
 }