update deps

.dockerignore

@@ -1,4 +1,5 @@
 .*
+target/rls
 target/*/deps
 target/*/build
 target/*/.fingerprint

.drone.yml

@@ -3,8 +3,9 @@ name: default
 
 steps:
  - name: build
-   image: rust:1.37.0
+   image: rust:1.37.0-buster
    commands:
+    - apt update && apt install git clang make pkg-config nettle-dev libssl-dev capnproto libsqlite3-dev -y
     - cargo test
     - rustup target add x86_64-unknown-linux-musl
     - cargo build --release --target x86_64-unknown-linux-musl

Cargo.toml

@@ -16,3 +16,8 @@ rand = "0.4.2"
 
 byteorder = "1.3.2"
 chrono = "0.4.9"
+sequoia-openpgp = "0.9.0"
+lazy_static = "1.4.0"
+c2-chacha = "0.2.2"
+sha2 = "0.8.0"
+hex = "0.3.2"

Dockerfile

@@ -1,9 +1,9 @@
-FROM scratch
+FROM debian:buster-slim
 
 VOLUME /snips
 
 EXPOSE 3000
 
-COPY target/x86_64-unknown-linux-musl/release/brownpaper /bin/
+COPY target/release/brownpaper /bin/
 
-ENTRYPOINT [ "/bin/brownpaper" ]
+ENTRYPOINT [ "/bin/brownpaper" ]

src/chacha_io.rs

@@ -0,0 +1,45 @@
+use c2_chacha::stream_cipher::{NewStreamCipher, SyncStreamCipher, SyncStreamCipherSeek};
+use c2_chacha::{ChaCha12, ChaCha20};
+use std::convert::TryInto;
+use std::io::{Read, Result, Write};
+
+pub struct ChaChaReader<'a>(ChaCha20, &'a mut Read);
+
+impl<'a> ChaChaReader<'a> {
+    pub fn new(key: &[u8], nonce: &[u8], source: &'a mut Read) -> ChaChaReader<'a> {
+        ChaChaReader(ChaCha20::new_var(key, nonce).unwrap(), source)
+    }
+}
+
+impl<'a> Read for ChaChaReader<'a> {
+    fn read(&mut self, buf: &mut [u8]) -> Result<usize> {
+        let red = self.1.read(buf)?;
+        self.0.apply_keystream(buf);
+        Ok(red)
+    }
+}
+
+pub struct ChaChaWriter<'a>(ChaCha20, &'a mut Write);
+
+impl<'a> ChaChaWriter<'a> {
+    pub fn new(key: &[u8], nonce: &[u8], sink: &'a mut Write) -> ChaChaWriter<'a> {
+        ChaChaWriter(ChaCha20::new_var(key, nonce).unwrap(), sink)
+    }
+}
+
+impl<'a> Write for ChaChaWriter<'a> {
+    fn write(&mut self, buf: &[u8]) -> Result<usize> {
+        let mut cipher_text = [0u8; 256];
+        let mut written = 0usize;
+        for chunk in buf.chunks(cipher_text.len()) {
+            cipher_text[0..chunk.len()].copy_from_slice(&chunk);
+            self.0.apply_keystream(&mut cipher_text[0..chunk.len()]);
+            written += self.1.write(&cipher_text[0..chunk.len()])?;
+        }
+        Ok(written)
+    }
+
+    fn flush(&mut self) -> Result<()> {
+        self.1.flush()
+    }
+}

src/main.rs

@@ -1,21 +1,34 @@
+#[macro_use]
+extern crate lazy_static;
 extern crate chrono;
 extern crate iron;
 extern crate rand;
+extern crate sequoia_openpgp as openpgp;
 extern crate snap;
 
+mod chacha_io;
+mod pgp;
+
+use crate::pgp::KnownKeys;
 use byteorder::{BigEndian, ReadBytesExt, WriteBytesExt};
+use chacha_io::{ChaChaReader, ChaChaWriter};
 use chrono::*;
+use core::cell::RefCell;
 use iron::method::Method;
 use iron::modifiers::Redirect;
 use iron::prelude::*;
 use iron::url::Url;
 use rand::Rng;
+use sha2::{Digest, Sha256};
+use std::borrow::BorrowMut;
+use std::convert::TryInto;
 use std::fs;
 use std::fs::File;
 use std::io;
 use std::io::prelude::*;
 use std::iter::Iterator;
 use std::path::{Path, PathBuf};
+use std::sync::Mutex;
 
 struct Snippet<'a> {
     id: String,
@@ -37,7 +50,7 @@ impl<'a> Snippet<'a> {
         Snippet::new(
             &rand::thread_rng()
                 .gen_ascii_chars()
-                .take(6)
+                .take(8)
                 .collect::<String>(),
             storage,
         )
@@ -50,13 +63,30 @@ impl<'a> Snippet<'a> {
         }
     }
 
+    pub fn file_id(&self) -> String {
+        SnippetStorage::file_id(&self.id)
+    }
+
+    pub fn passphrase(&self) -> ([u8; 8], [u8; 32]) {
+        let mut hasher = Sha256::new();
+        hasher.input(self.id.as_bytes());
+        let res = hasher.result();
+        let nonce: [u8; 8] = res[0..8].try_into().unwrap();
+        let mut hasher = Sha256::new();
+        hasher.input(self.id.as_bytes());
+        hasher.input(b"pass");
+        let pass: [u8; 32] = res[0..32].try_into().unwrap();
+        (nonce, pass)
+    }
+
     pub fn path(&self) -> PathBuf {
-        self.storage.directory.join(&self.id)
+        self.storage.directory.join(&self.file_id())
     }
 
     pub fn metadata(&self) -> Result<SnippetMeta, io::Error> {
         let mut file = File::open(self.path())?;
-        self.metadata_via_handle(&mut file)
+        let (nonce, key) = self.passphrase();
+        self.metadata_via_handle(&mut ChaChaReader::new(&key, &nonce, &mut file))
     }
 
     fn metadata_via_handle(&self, hdl: &mut impl Read) -> Result<SnippetMeta, io::Error> {
@@ -74,38 +104,42 @@ impl<'a> Snippet<'a> {
 
     fn contents(&self) -> Result<String, io::Error> {
         let mut file = File::open(self.path())?;
-        let meta = self.metadata_via_handle(&mut file)?;
+        let (nonce, key) = self.passphrase();
+        let mut reader = ChaChaReader::new(&key, &nonce, &mut file);
+        let meta = self.metadata_via_handle(&mut reader)?;
         fn read_string(r: &mut impl Read) -> Result<String, io::Error> {
             let mut text = String::new();
             r.read_to_string(&mut text)?;
             Ok(text)
         }
-        dbg!((&meta.compression, &meta.created));
+        dbg!((&meta.compression, &meta.created, self.file_id()));
         match meta.compression {
             Some(ref comp) if comp == "snap" => {
-                let mut r = snap::Reader::new(&mut file);
+                let mut r = snap::Reader::new(&mut reader);
                 read_string(&mut r)
             }
-            _ => read_string(&mut file),
+            _ => read_string(&mut reader),
         }
     }
 
     fn write(self, content: &str) -> Result<Snippet<'a>, io::Error> {
         let mut file = File::create(self.path())?;
-        file.write_i64::<BigEndian>(Utc::now().timestamp())?;
+        let (nonce, key) = self.passphrase();
+        let mut writer = ChaChaWriter::new(&key, &nonce, &mut file);
+        writer.write_i64::<BigEndian>(Utc::now().timestamp())?;
         let comp = if content.len() > 2048 {
             Some("snap")
         } else {
             None
         };
-        file.write_u16::<BigEndian>(comp.map(|s| s.len() as u16).unwrap_or(0u16))?;
-        file.write(comp.map(|s| s.as_bytes()).unwrap_or(&[0u8; 0]))?;
+        writer.write_u16::<BigEndian>(comp.map(|s| s.len() as u16).unwrap_or(0u16))?;
+        writer.write(comp.map(|s| s.as_bytes()).unwrap_or(&[0u8; 0]))?;
         match comp {
             Some(ref comp) if comp == &"snap" => {
-                let mut w = snap::Writer::new(&mut file);
+                let mut w = snap::Writer::new(&mut writer);
                 w.write_all(content.as_bytes())?
             }
-            _ => file.write_all(content.as_bytes())?,
+            _ => writer.write_all(content.as_bytes())?,
         };
         Ok(Snippet::new(&self.id, self.storage))
     }
@@ -117,9 +151,13 @@ impl<'a> SnippetStorage<'a> {
             directory: directory,
         }
     }
-
+    pub fn file_id(id: &str) -> String {
+        let mut hasher = Sha256::new();
+        hasher.input(id.as_bytes());
+        hex::encode(&hasher.result()[0..12])
+    }
     fn has(&self, id: &str) -> bool {
-        self.directory.join(id).exists()
+        self.directory.join(Self::file_id(id)).exists()
     }
 
     fn open(&self, id: &str) -> Option<Snippet> {
@@ -137,6 +175,12 @@ const STORAGE_DIR: &str = "/snips";
 #[cfg(debug_assertions)]
 const STORAGE_DIR: &str = "/tmp";
 
+lazy_static! {
+    static ref KNOWN_KEYS: Mutex<KnownKeys> = Mutex::new(
+        KnownKeys::load_dir([STORAGE_DIR, "keys"].join("/")).expect("Failed to load pubkeys")
+    );
+}
+
 const VERSION: &str = env!("CARGO_PKG_VERSION");
 
 fn handle(req: &mut Request) -> IronResult<Response> {
@@ -148,7 +192,7 @@ fn handle(req: &mut Request) -> IronResult<Response> {
         (Method::Post, Some(path)) => {
             if path == &"new" {
                 let snip = {
-                    let text: String = {
+                    let pgp_text: String = {
                         let bytes = ((&mut req.body).bytes().take(1024 * 512).collect::<Result<
                             Vec<u8>,
                             io::Error,
@@ -158,6 +202,12 @@ fn handle(req: &mut Request) -> IronResult<Response> {
                         String::from_utf8(bytes)
                             .map_err(|err| IronError::new(err, "Invalid utf8"))?
                     };
+                    let b_text = KNOWN_KEYS
+                        .lock()
+                        .unwrap() //.map_err(|_| IronError::new(std::error::Error::from("Mutex Err"), "PGP Context unavailable"))?
+                        .verify(pgp_text.as_bytes())
+                        .map_err(|err| IronError::new(err, "Untrusted signature"))?;
+                    let text = String::from_utf8(b_text).unwrap();
                     Snippet::random(&storage).write(&*text).map_err(|err| {
                         let msg = format!("Failed to save snippet: {:?}", &err);
                         IronError::new(err, msg)

src/pgp.rs

@@ -0,0 +1,51 @@
+use openpgp::parse::stream::*;
+use openpgp::parse::Parse;
+use openpgp::*;
+use std::fs;
+use std::fs::File;
+use std::io;
+use std::io::prelude::*;
+use std::path::Path;
+
+pub struct KnownKeys {
+    keys: Vec<openpgp::TPK>,
+}
+impl VerificationHelper for &KnownKeys {
+    fn get_public_keys(&mut self, _ids: &[KeyID]) -> Result<Vec<TPK>> {
+        Ok(self.keys.clone())
+    }
+    fn check(&mut self, structure: &MessageStructure) -> Result<()> {
+        Ok(()) // Implement your verification policy here.
+    }
+}
+
+impl KnownKeys {
+    pub fn load_dir(dir: impl AsRef<Path>) -> io::Result<KnownKeys> {
+        let mut keys: Vec<openpgp::TPK> = Vec::with_capacity(3);
+        for f in fs::read_dir(dir)? {
+            let f = f?;
+            if f.metadata()?.is_dir() {
+                continue;
+            }
+            let tpk = openpgp::TPK::from_file(f.path()).unwrap();
+            println!("Fingerprint: {}", tpk.fingerprint());
+            keys.push(tpk);
+        }
+        Ok(KnownKeys { keys: keys })
+    }
+
+    pub fn verify(&mut self, r: impl Read) -> io::Result<Vec<u8>> {
+        let mut content = Vec::with_capacity(2048);
+        let helper = &*self;
+        let mut v = Verifier::<&KnownKeys>::from_reader(r, helper, None)
+            .map_err(|e| dbg!(e))
+            .unwrap();
+        if v.read_to_end(&mut content).is_err() {
+            return Err(io::Error::new(
+                io::ErrorKind::InvalidData,
+                "Signature Mismatch",
+            ));
+        }
+        Ok(content)
+    }
+}