From 306eb86d74bb54e9e5aba61dba83346de6e77c4f Mon Sep 17 00:00:00 2001
From: ae <git@golfed.xyz>
Date: Tue, 24 Sep 2024 00:14:53 +0300
Subject: [PATCH] chore: commit history pruned

---
 .gitignore                   |    7 +
 .pre-commit-config.yaml      |    8 +
 Cargo.lock                   | 1499 ++++++++++++++++++++++++++++++++++
 Cargo.toml                   |   24 +
 LICENSE                      |   21 +
 README.md                    |   43 +
 docs/contego-dark.png        |  Bin 0 -> 12216 bytes
 docs/contego-light.png       |  Bin 0 -> 11923 bytes
 src/client.rs                |  148 ++++
 src/crypto.rs                |  111 +++
 src/lib.rs                   |    6 +
 src/main.rs                  |  115 +++
 src/parser.rs                |   94 +++
 src/server.rs                |  200 +++++
 src/sockets.rs               |  103 +++
 src/util.rs                  |  132 +++
 tests/data/.placeholder      |    0
 tests/output/.placeholder    |    0
 tests/sockets_integration.rs |  101 +++
 19 files changed, 2612 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 .pre-commit-config.yaml
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 LICENSE
 create mode 100644 README.md
 create mode 100644 docs/contego-dark.png
 create mode 100644 docs/contego-light.png
 create mode 100644 src/client.rs
 create mode 100644 src/crypto.rs
 create mode 100755 src/lib.rs
 create mode 100755 src/main.rs
 create mode 100644 src/parser.rs
 create mode 100644 src/server.rs
 create mode 100644 src/sockets.rs
 create mode 100644 src/util.rs
 create mode 100644 tests/data/.placeholder
 create mode 100644 tests/output/.placeholder
 create mode 100644 tests/sockets_integration.rs

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..1ff84a6
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,7 @@
+/target
+
+tests/data/**
+tests/output/**
+
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+!tests/data/.placeholder
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
new file mode 100644
index 0000000..6433eff
--- /dev/null
+++ b/.pre-commit-config.yaml
@@ -0,0 +1,8 @@
+repos:
+  - repo: https://github.com/doublify/pre-commit-rust
+    rev: v1.0
+    hooks:
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+        args: ["--verbose", "--"]
+      - id: cargo-check
+      - id: clippy
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..8757347
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,1499 @@
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..1a87a52
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,24 @@
+[package]
+name = "contego"
+version = "0.4.0"
+authors = ["ae"]
+description = "Cryptographically secure file transfer CLI tool "
+repository = "https://umbrella.haus/ae/contego"
+license = "MIT"
+edition = "2021"
+
+[dependencies]
+tokio = { version = "1.28.1", features = ["full"] }
+rand = "0.7.0"
+x25519-dalek = "1.2.0"
+aes-gcm = "0.10.3"
+base64 = "0.21.2"
+sha256 = "1.1.3"
+ureq = "2.6.2"
+clap = { version = "4.3.0", features = ["derive"] }
+log = "0.4.17"
+env_logger = "0.10.0"
+
+[dev-dependencies]
+tokio-test = "0.4.2"
+ntest = "0.9.0"
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..aaba73a
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2022 ae
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..0a47628
--- /dev/null
+++ b/README.md
@@ -0,0 +1,43 @@
+<div align="center" style="text-align:center">
+    <picture>
+        <source media="(prefers-color-scheme: light)" srcset="docs/contego-light.png">
+        <img src="docs/contego-dark.png" width="800">
+    </picture>
+</div>
+
+## Cryptographic specifications
+
+The initial key exchange is performed with elliptic-curve Diffie-Hellman. General data exchange is encrypted with AES-GCM. During regular communication payloads are Base64 encoded before being encrypted to prevent delimiter conflicts. SHA-256 hashes of files are compared to ensure data integrity.
+
+## Usage
+
+Build the optimized binary with `cargo build --release`.
+
+### Server
+
+```
+Usage: contego host [OPTIONS] --key <KEY> <--source <SOURCE>|--files <FILES>...>
+
+Options:
+  -k, --key <KEY>              Access key
+  -s, --source <SOURCE>        Path to a source file (alternative to --files)
+  -f, --files <FILES>...       Paths to shareable files (alternative to --source)
+  -p, --port <PORT>            Host port [default: 8080]
+  -6, --ipv6                   IPv6 instead of IPv4
+  -c, --chunksize <CHUNKSIZE>  Transmit chunksize in bytes [default: 8192]
+  -l, --local                  Host locally
+  -h, --help                   Print help
+
+```
+
+### Client
+
+```
+Usage: contego connect --addr <ADDR> --out <OUT> --key <KEY>
+
+Options:
+  -a, --addr <ADDR>  IP address of the instance
+  -o, --out <OUT>    Path to an output folder
+  -k, --key <KEY>    Access key
+  -h, --help         Print help
+```
diff --git a/docs/contego-dark.png b/docs/contego-dark.png
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z9B1vn{<nX5G>L_JdP|mo-&iAPw4p`VztWnPZ5#7DNy#-;5`3ZI#Fr8qBo01qV#1Zm
nW1xNnk`eX)dH#<OSS^D*jN0l~)RVR$65U<BT(15UvhV)^^Xld^

literal 0
HcmV?d00001

diff --git a/src/client.rs b/src/client.rs
new file mode 100644
index 0000000..9592600
--- /dev/null
+++ b/src/client.rs
@@ -0,0 +1,148 @@
+use std::{error::Error, net::SocketAddr, path::PathBuf};
+
+use log::{debug, error, info};
+use tokio::{io::AsyncWriteExt, net::TcpStream};
+
+use crate::{
+    crypto::{self, Crypto},
+    sockets::SocketHandler,
+    util::{new_file, FileInfo},
+};
+
+#[derive(Clone)]
+pub struct Client {
+    addr: SocketAddr,
+    key: String,
+    output: PathBuf,
+}
+
+impl Client {
+    pub fn new(addr: SocketAddr, key: String, output: PathBuf) -> Self {
+        Self { addr, key, output }
+    }
+
+    pub async fn connection(&self) -> Result<(), Box<dyn Error + Send + Sync>> {
+        info!("Trying to connect to the server at {}", self.addr);
+
+        let mut socket = TcpStream::connect(self.addr).await?;
+
+        debug!("Connected to the TCP socket at {}", self.addr);
+
+        let mut handler = SocketHandler::new(&mut socket);
+        let crypto = Crypto::new(&mut handler, true).await?;
+        handler.set_crypto(crypto);
+
+        info!("Encrypted connection to {} established", self.addr);
+
+        if !self.authorize(&mut handler).await? {
+            error!(
+                "Authorization failed due to an invalid access key '{}'",
+                self.key
+            );
+            return Ok(());
+        }
+
+        let metadata = self.metadata(&mut handler).await?;
+        self.requests(&mut handler, metadata).await?;
+
+        debug!("Connection sequence done, shutting down");
+
+        Ok(())
+    }
+
+    async fn authorize(
+        &self,
+        handler: &mut SocketHandler<'_>,
+    ) -> Result<bool, Box<dyn Error + Send + Sync>> {
+        debug!("Starting authorization");
+
+        let msg = self.key.as_bytes().to_vec();
+        handler.send(&msg).await?;
+
+        let buf = handler.recv().await?;
+        let msg = String::from_utf8(buf)?;
+        let msg = msg.trim();
+
+        if msg == "DISCONNECT" {
+            return Ok(false);
+        }
+
+        debug!("Authorization successfully done");
+
+        Ok(true)
+    }
+
+    async fn metadata(
+        &self,
+        handler: &mut SocketHandler<'_>,
+    ) -> Result<Vec<FileInfo>, Box<dyn Error + Send + Sync>> {
+        debug!("Starting to receive metadata");
+
+        let buf = handler.recv().await?;
+        let amt = String::from_utf8(buf.clone())?.parse::<usize>()?;
+        handler.send(&buf).await?; // confirmation
+
+        debug!("Confirmed metadata amount ({})", amt);
+
+        let mut metadata = Vec::new();
+
+        while metadata.len() < amt {
+            let buf = handler.recv().await?;
+            let data = String::from_utf8(buf)?;
+
+            let split = data.split(':').collect::<Vec<&str>>();
+            let name = split[0].trim().to_string();
+            let size = split[1].trim().parse::<u64>()?;
+            let hash = split[2].trim().to_string();
+
+            debug!("Metadata of file '{}' received successfully", name);
+
+            let info = FileInfo::new(name, size, hash);
+
+            metadata.push(info);
+        }
+
+        Ok(metadata)
+    }
+
+    async fn requests(
+        &self,
+        handler: &mut SocketHandler<'_>,
+        metadata: Vec<FileInfo>,
+    ) -> Result<(), Box<dyn Error + Send + Sync>> {
+        info!("Starting to send requests");
+
+        for file in metadata {
+            let (mut handle, path) = new_file(self.output.clone(), &file.name).await?;
+            let msg = file.hash.as_bytes().to_vec();
+            handler.send(&msg).await?;
+
+            info!("Requesting file '{}'", file.hash);
+
+            let mut remaining = file.size;
+
+            while remaining != 0 {
+                let buf = handler.recv().await?;
+                handle.write_all(&buf).await?;
+                handle.flush().await?;
+                remaining -= buf.len() as u64;
+
+                debug!("File '{}': {} bytes remaining", file.hash, remaining);
+            }
+
+            let check_hash = crypto::try_hash(&path).unwrap();
+            let msg = check_hash.as_bytes().to_vec();
+            handler.send(&msg).await?;
+
+            if check_hash != file.hash {
+                return Err("Unsuccessful file transfer, hashes don't match".into());
+            }
+
+            info!("File '{}' successfully transferred", file.hash);
+        }
+
+        info!("All requests successfully done");
+
+        Ok(())
+    }
+}
diff --git a/src/crypto.rs b/src/crypto.rs
new file mode 100644
index 0000000..e9596ea
--- /dev/null
+++ b/src/crypto.rs
@@ -0,0 +1,111 @@
+use std::{error::Error, path::Path};
+
+use aes_gcm::{
+    aead::{consts::U12, Aead},
+    aes::Aes256,
+    Aes256Gcm, AesGcm, KeyInit, Nonce,
+};
+use log::debug;
+use rand::{rngs::OsRng, RngCore};
+use x25519_dalek::{EphemeralSecret, PublicKey, SharedSecret};
+
+use crate::sockets::SocketHandler;
+
+const AES_NONCE_SIZE: usize = 12;
+const DH_PBK_SIZE: usize = 32;
+
+#[derive(Clone)]
+pub struct Crypto {
+    cipher: AesGcm<Aes256, U12>,
+    rng: OsRng,
+}
+
+impl Crypto {
+    pub async fn new(
+        handler: &mut SocketHandler<'_>,
+        go_first: bool,
+    ) -> Result<Self, Box<dyn Error + Sync + Send>> {
+        let secret = Self::ecdh(handler, go_first).await?;
+        let cipher = Aes256Gcm::new(secret.as_bytes().into());
+        let rng = OsRng;
+
+        Ok(Self { cipher, rng })
+    }
+
+    async fn ecdh(
+        handler: &mut SocketHandler<'_>,
+        go_first: bool,
+    ) -> Result<SharedSecret, Box<dyn Error + Send + Sync>> {
+        debug!("Starting ECDH key exchange");
+
+        let buf: Vec<u8>;
+        let own_sec = EphemeralSecret::new(OsRng);
+        let own_pbk = PublicKey::from(&own_sec);
+        let mut msg = own_pbk.as_bytes().to_vec();
+
+        msg.push(b':'); // manual delimiter
+
+        if go_first {
+            handler.send_raw(&msg).await?;
+            buf = handler.recv_raw(DH_PBK_SIZE).await?;
+        } else {
+            buf = handler.recv_raw(DH_PBK_SIZE).await?;
+            handler.send_raw(&msg).await?;
+        }
+
+        debug!("Calculating PPK from the shared secret");
+
+        let slice: [u8; DH_PBK_SIZE] = buf[..DH_PBK_SIZE].try_into()?;
+        let recv_pbk = PublicKey::from(slice);
+        let pvk = own_sec.diffie_hellman(&recv_pbk);
+
+        debug!("PPK successfully generated");
+
+        Ok(pvk)
+    }
+
+    fn nonce(&mut self) -> Nonce<U12> {
+        debug!("Generating new unique nonce (AEAD)");
+
+        let mut nonce = Nonce::default();
+        self.rng.fill_bytes(&mut nonce);
+
+        nonce
+    }
+
+    pub async fn encrypt(&mut self, data: &[u8]) -> Result<Vec<u8>, Box<dyn Error + Send + Sync>> {
+        debug!("Encrypting {} bytes payload", data.len());
+
+        let nonce = self.nonce();
+        let encrypted = match self.cipher.encrypt(&nonce, data.as_ref()) {
+            Ok(data) => data,
+            Err(e) => return Err(format!("Encryption failed: {}", e).into()),
+        };
+
+        let mut data = nonce.to_vec();
+        data.extend_from_slice(&encrypted);
+
+        Ok(data)
+    }
+
+    pub async fn decrypt(&self, data: &[u8]) -> Result<Vec<u8>, Box<dyn Error + Send + Sync>> {
+        debug!("Decrypting {} bytes payload", data.len());
+
+        let (nonce_bytes, data) = data.split_at(AES_NONCE_SIZE);
+        let nonce = Nonce::from_slice(nonce_bytes);
+        let decrypted = match self.cipher.decrypt(nonce, data.as_ref()) {
+            Ok(data) => data,
+            Err(e) => return Err(format!("Decryption failed: {}", e).into()),
+        };
+
+        Ok(decrypted)
+    }
+}
+
+pub fn try_hash(path: &Path) -> Result<String, Box<dyn Error>> {
+    debug!("Calculating SHA hash");
+
+    let hash = sha256::try_digest(path)?;
+
+    Ok(hash)
+}
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100755
index 0000000..4e16913
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,6 @@
+pub mod client;
+pub mod crypto;
+pub mod parser;
+pub mod server;
+pub mod sockets;
+pub mod util;
diff --git a/src/main.rs b/src/main.rs
new file mode 100755
index 0000000..ef8827b
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,115 @@
+use std::{error::Error, net::SocketAddr, path::PathBuf};
+
+use clap::{command, ArgGroup, Parser, Subcommand};
+
+use contego::{
+    client::Client,
+    parser::{addr_parser, dirpath_parser, filepath_parser},
+    server::Server,
+    util::{ascii, filepaths, metadata, Ip},
+};
+use env_logger::Env;
+use log::{error, info};
+use tokio::{signal, sync::mpsc};
+
+#[derive(Debug, Parser)]
+#[command(about, version)]
+struct Cli {
+    #[command(subcommand)]
+    command: Commands,
+}
+
+#[derive(Debug, Subcommand)]
+enum Commands {
+    #[clap(group(ArgGroup::new("input").required(true).args(&["source", "files"])))]
+    Host {
+        /// Access key
+        #[clap(short = 'k', long)]
+        key: String,
+        /// Path to a source file (alternative to --files)
+        #[clap(short = 's', long, value_parser = filepath_parser, conflicts_with = "files", group = "input")]
+        source: Option<PathBuf>,
+        /// Paths to shareable files (alternative to --source)
+        #[clap(short = 'f', long, num_args = 1.., value_parser = filepath_parser, conflicts_with = "source", group = "input")]
+        files: Option<Vec<PathBuf>>,
+        /// Host port
+        #[clap(short = 'p', long, default_value_t = 8080)]
+        port: u16,
+        /// IPv6 instead of IPv4
+        #[clap(short = '6', long, default_value_t = false)]
+        ipv6: bool,
+        /// Transmit chunksize in bytes
+        #[clap(short = 'c', long, default_value_t = 8192)]
+        chunksize: usize,
+        /// Host locally
+        #[clap(short = 'l', long, default_value_t = false)]
+        local: bool,
+    },
+    Connect {
+        /// IP address of the instance
+        #[clap(short = 'a', long, value_parser = addr_parser)]
+        addr: SocketAddr,
+        /// Path to an output folder
+        #[clap(short = 'o', long, value_parser = dirpath_parser)]
+        out: PathBuf,
+        /// Access key
+        #[clap(short = 'k', long)]
+        key: String,
+    },
+}
+
+#[tokio::main]
+async fn main() -> Result<(), Box<dyn Error>> {
+    ascii();
+
+    env_logger::Builder::from_env(Env::default().default_filter_or("info")).init();
+    let cli = Cli::parse();
+
+    match cli.command {
+        Commands::Host {
+            port,
+            ipv6,
+            source,
+            files,
+            chunksize,
+            local,
+            key,
+        } => {
+            let (tx, rx) = mpsc::channel::<()>(1);
+
+            let paths = filepaths(source, files)?;
+            let (metadata, index) = metadata(&paths).await?;
+            let (display_addr, bind_addr) = match (local, ipv6) {
+                (true, _) => Ip::Local.fetch(port)?,
+                (false, true) => Ip::V6.fetch(port)?,
+                (false, false) => Ip::V4.fetch(port)?,
+            };
+
+            let server = Server::new(display_addr, key, chunksize, metadata, index);
+
+            tokio::spawn(async move {
+                match server.start(rx, &bind_addr).await {
+                    Ok(_) => {}
+                    Err(e) => error!("Error during server execution: {}", e),
+                };
+            });
+
+            match signal::ctrl_c().await {
+                Ok(_) => {
+                    tx.send(()).await?;
+                    info!("Captured Ctrl+C, shutting down");
+                }
+                Err(_) => error!("Failed to listen for a Ctrl+C event"),
+            };
+        }
+        Commands::Connect { addr, out, key } => {
+            let client = Client::new(addr, key, out);
+            match client.connection().await {
+                Ok(_) => {}
+                Err(e) => error!("Error during client execution: {}", e),
+            };
+        }
+    };
+
+    Ok(())
+}
diff --git a/src/parser.rs b/src/parser.rs
new file mode 100644
index 0000000..6c2c6b1
--- /dev/null
+++ b/src/parser.rs
@@ -0,0 +1,94 @@
+use std::{
+    env,
+    io::{Error, ErrorKind::NotFound},
+    net::{AddrParseError, SocketAddr},
+    path::PathBuf,
+};
+
+use log::debug;
+
+pub fn addr_parser(addr: &str) -> Result<SocketAddr, AddrParseError> {
+    let addr = addr
+        .parse::<SocketAddr>()
+        .expect("Failed to parse IP address");
+
+    Ok(addr)
+}
+
+pub fn filepath_parser(path: &str) -> Result<PathBuf, Error> {
+    debug!("Validating filepath '{}'", path);
+
+    let home = env::var("HOME").unwrap();
+    let path = path
+        .replace('~', &home)
+        .parse::<PathBuf>()
+        .expect("Failed to parse path");
+
+    if path.exists() && path.is_file() {
+        Ok(path)
+    } else {
+        Err(Error::new(NotFound, "File not found"))
+    }
+}
+
+pub fn dirpath_parser(path: &str) -> Result<PathBuf, Error> {
+    debug!("Validating dirpath '{}'", path);
+
+    let path = path.parse::<PathBuf>().expect("Failed to parse path");
+
+    if path.exists() && path.is_dir() {
+        Ok(path)
+    } else {
+        Err(Error::new(NotFound, "Directory not found"))
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    #[test]
+    fn valid_ip() {
+        use std::net::Ipv6Addr;
+
+        let ipv4 = "10.1.2.3:8888";
+        let ipv6 = "[2001:db8::1]:8888";
+
+        let parsed_ipv4 = addr_parser(ipv4).unwrap();
+        let parsed_ipv6 = addr_parser(ipv6).unwrap();
+
+        assert_eq!(parsed_ipv4, SocketAddr::from(([10, 1, 2, 3], 8888)));
+        assert_eq!(
+            parsed_ipv6,
+            SocketAddr::from((Ipv6Addr::new(0x2001, 0xdb8, 0, 0, 0, 0, 0, 1), 8888))
+        );
+    }
+
+    #[test]
+    #[should_panic]
+    fn short_ip() {
+        let ip = "10.1.2:8888";
+        addr_parser(ip).unwrap();
+    }
+
+    #[test]
+    #[should_panic]
+    fn long_ip() {
+        let ip = "[2001:0db8:ac10:fe01:0000:0000:0000:0000:0000]:8888";
+        addr_parser(ip).unwrap();
+    }
+
+    #[test]
+    #[should_panic]
+    fn ipv6_no_brackets() {
+        let ip = "2001:db8::1:8888";
+        addr_parser(ip).unwrap();
+    }
+
+    #[test]
+    #[should_panic]
+    fn ip_missing_port() {
+        let ip = "10.1.2.3";
+        addr_parser(ip).unwrap();
+    }
+}
diff --git a/src/server.rs b/src/server.rs
new file mode 100644
index 0000000..af5b61e
--- /dev/null
+++ b/src/server.rs
@@ -0,0 +1,200 @@
+use std::{collections::HashMap, error::Error, net::SocketAddr, path::PathBuf, sync::Arc};
+
+use log::{debug, error, info};
+use tokio::{
+    fs::File,
+    io::AsyncReadExt,
+    net::{TcpListener, TcpStream},
+    sync::mpsc,
+};
+
+use crate::{crypto::Crypto, sockets::SocketHandler, util::FileInfo};
+
+#[derive(Clone)]
+pub struct Server {
+    addr: SocketAddr,
+    key: String,
+    chunksize: usize,
+    metadata: Vec<FileInfo>,
+    index: HashMap<String, PathBuf>,
+}
+
+impl Server {
+    pub fn new(
+        addr: SocketAddr,
+        key: String,
+        chunksize: usize,
+        metadata: Vec<FileInfo>,
+        index: HashMap<String, PathBuf>,
+    ) -> Arc<Self> {
+        Arc::new(Self {
+            addr,
+            key,
+            chunksize,
+            metadata,
+            index,
+        })
+    }
+
+    pub async fn start(
+        self: Arc<Self>,
+        mut kill: mpsc::Receiver<()>,
+        bind_addr: &SocketAddr,
+    ) -> Result<(), Box<dyn Error + Send + Sync>> {
+        tokio::select! {
+            _ = self.listen(bind_addr) => Ok(()),
+            _ = kill.recv() => Ok(()),
+        }
+    }
+
+    async fn listen(
+        self: Arc<Self>,
+        bind_addr: &SocketAddr,
+    ) -> Result<(), Box<dyn Error + Send + Sync>> {
+        let listener = TcpListener::bind(bind_addr).await?;
+
+        info!("Listening on {} - Access key: {}", self.addr, self.key);
+
+        loop {
+            let this_self = self.clone();
+            let (mut socket, addr) = listener.accept().await?;
+
+            info!("New client connected: {}", addr);
+
+            match tokio::spawn(async move { this_self.connection(&mut socket, &addr).await }).await
+            {
+                Ok(_) => info!("Client disconnected: {}", addr),
+                Err(e) => error!("Fatal error in connection {}: {}", addr, e),
+            };
+        }
+    }
+
+    async fn connection(
+        &self,
+        socket: &mut TcpStream,
+        addr: &SocketAddr,
+    ) -> Result<(), Box<dyn Error + Send + Sync>> {
+        let mut handler = SocketHandler::new(socket);
+        let crypto = Crypto::new(&mut handler, false).await?;
+        handler.set_crypto(crypto);
+
+        debug!("({}): Connection established", addr);
+
+        if !self.authorize(&mut handler, addr).await? {
+            info!("({}): Invalid access key", addr);
+            return Ok(());
+        }
+
+        self.metadata(&mut handler, addr).await?;
+        self.requests(&mut handler, addr).await?;
+
+        Ok(())
+    }
+
+    async fn authorize(
+        &self,
+        handler: &mut SocketHandler<'_>,
+        addr: &SocketAddr,
+    ) -> Result<bool, Box<dyn Error + Send + Sync>> {
+        debug!("({}): Starting authorization", addr);
+
+        let buf = handler.recv().await?;
+        let key = String::from_utf8(buf)?;
+
+        let is_valid: bool;
+        let res_msg: Vec<u8>;
+
+        if key != self.key {
+            is_valid = false;
+            res_msg = b"DISCONNECT".to_vec();
+        } else {
+            is_valid = true;
+            res_msg = b"VALID".to_vec();
+        }
+
+        handler.send(&res_msg).await?;
+
+        debug!("({}): Authorization finished", addr);
+
+        Ok(is_valid)
+    }
+
+    async fn metadata(
+        &self,
+        handler: &mut SocketHandler<'_>,
+        addr: &SocketAddr,
+    ) -> Result<(), Box<dyn Error + Send + Sync>> {
+        debug!("({}): Starting to send metadata", addr);
+
+        let amt = self.metadata.len();
+        let msg = amt.to_string().as_bytes().to_vec();
+
+        handler.send(&msg).await?;
+
+        let buf = handler.recv().await?;
+        let res_amt = String::from_utf8(buf)?.trim().parse::<usize>()?;
+
+        if res_amt != amt {
+            return Err("Broken message sequence during metadata exchange".into());
+        }
+
+        debug!("({}): Metadata amount confirmed successfully", addr);
+
+        for file in &self.metadata {
+            let msg = format!("{}:{}:{}", file.name, file.size, file.hash)
+                .as_bytes()
+                .to_vec();
+            handler.send(&msg).await?;
+
+            debug!("({}): Sent metadata of file '{}'", addr, file.hash);
+        }
+
+        Ok(())
+    }
+
+    async fn requests(
+        &self,
+        handler: &mut SocketHandler<'_>,
+        addr: &SocketAddr,
+    ) -> Result<(), Box<dyn Error + Send + Sync>> {
+        debug!("({}): Waiting for file requests", addr);
+
+        loop {
+            let buf = handler.recv().await?;
+            let hash = String::from_utf8(buf)?;
+            let hash = hash.trim();
+
+            if hash == "DISCONNECT" {
+                break;
+            }
+
+            debug!("({}): Received request for file '{}'", addr, hash);
+
+            let mut file = File::open(self.index[hash].clone()).await?;
+            let mut remaining = file.metadata().await?.len();
+            let mut sendbuf = vec![0u8; self.chunksize];
+
+            debug!("({}): Sending bytes of '{}'", addr, hash);
+
+            while remaining != 0 {
+                let n = file.read(&mut sendbuf).await?;
+                handler.send(&sendbuf[..n]).await?;
+                remaining -= n as u64;
+
+                debug!("({}): {} bytes remaining", addr, remaining);
+            }
+
+            let buf = handler.recv().await?;
+            let confirmation = String::from_utf8(buf)?;
+            let confirmation = confirmation.trim();
+
+            if confirmation != hash {
+                return Err("Unsuccessful file transfer, hashes don't match".into());
+            }
+
+            debug!("({}): File '{}' successfully transferred", addr, hash);
+        }
+
+        Ok(())
+    }
+}
diff --git a/src/sockets.rs b/src/sockets.rs
new file mode 100644
index 0000000..ad01e3e
--- /dev/null
+++ b/src/sockets.rs
@@ -0,0 +1,103 @@
+use std::error::Error;
+
+use base64::{engine::general_purpose, Engine};
+use log::debug;
+use tokio::{
+    io::{AsyncBufReadExt, AsyncWriteExt, BufReader, BufWriter},
+    net::{
+        tcp::{ReadHalf, WriteHalf},
+        TcpStream,
+    },
+};
+
+use crate::crypto::Crypto;
+
+pub struct SocketHandler<'a> {
+    writer: BufWriter<WriteHalf<'a>>,
+    reader: BufReader<ReadHalf<'a>>,
+    crypto: Option<Crypto>,
+}
+
+impl<'a> SocketHandler<'a> {
+    pub fn new(socket: &'a mut TcpStream) -> Self {
+        let (reader, writer) = socket.split();
+        let reader = BufReader::new(reader);
+        let writer = BufWriter::new(writer);
+
+        Self {
+            writer,
+            reader,
+            crypto: None,
+        }
+    }
+
+    pub fn set_crypto(&mut self, crypto: Crypto) {
+        // setting up AES cipher requires DH key exchange in plaintext,
+        // meaning crypto can't be initialized at the same time as the socket handler
+        debug!("Cryptography module initialized to the connection");
+        self.crypto = Some(crypto);
+    }
+
+    pub async fn send(&mut self, data: &[u8]) -> Result<(), Box<dyn Error + Send + Sync>> {
+        let data = match &mut self.crypto {
+            Some(c) => c.encrypt(data).await?,
+            None => data.to_vec(), // syntactic sugar, never actually called
+        };
+
+        let mut encoded = general_purpose::STANDARD_NO_PAD
+            .encode(data)
+            .as_bytes()
+            .to_vec();
+        encoded.push(b':');
+
+        self.send_raw(&encoded).await?;
+
+        Ok(())
+    }
+
+    pub async fn send_raw(&mut self, data: &[u8]) -> Result<(), Box<dyn Error + Send + Sync>> {
+        self.writer.write_all(data).await?;
+        self.writer.flush().await?;
+
+        debug!("Sent {} bytes to the socket", data.len());
+
+        Ok(())
+    }
+
+    pub async fn recv(&mut self) -> Result<Vec<u8>, Box<dyn Error + Send + Sync>> {
+        let mut buf = self.recv_raw(1).await?;
+        buf.pop();
+        buf = general_purpose::STANDARD_NO_PAD.decode(&buf)?.to_vec();
+
+        let data = match &self.crypto {
+            Some(c) => c.decrypt(&buf).await?,
+            None => buf,
+        };
+
+        Ok(data)
+    }
+
+    pub async fn recv_raw(
+        &mut self,
+        min_limit: usize,
+    ) -> Result<Vec<u8>, Box<dyn Error + Send + Sync>> {
+        let mut buf = Vec::new();
+
+        while buf.len() <= min_limit {
+            let n = self.reader.read_until(b':', &mut buf).await?;
+
+            if n == 0 {
+                return Err("Received 0 bytes from the socket".into());
+            }
+        }
+
+        /*
+        TODO: use min_limit to check whether read_until has reached EOF before reading all the necessary bytes
+        (e.g. regarding ecdh key exchange) --> loop and read until buf.len() == min_limit
+        */
+
+        debug!("Received {} bytes from the socket", buf.len());
+
+        Ok(buf)
+    }
+}
diff --git a/src/util.rs b/src/util.rs
new file mode 100644
index 0000000..9fdd279
--- /dev/null
+++ b/src/util.rs
@@ -0,0 +1,132 @@
+use std::{collections::HashMap, env, error::Error, fs, net::SocketAddr, path::PathBuf};
+
+use log::{debug, info};
+use tokio::{fs::File, io::BufWriter};
+
+use crate::crypto;
+
+const PUBLIC_IPV4: &str = "https://ipinfo.io/ip";
+const PUBLIC_IPV6: &str = "https://ipv6.icanhazip.com";
+
+#[derive(PartialEq, Eq)]
+pub enum Ip {
+    V4,
+    V6,
+    Local,
+}
+
+impl Ip {
+    pub fn fetch(self, port: u16) -> Result<(SocketAddr, SocketAddr), Box<dyn Error>> {
+        let addr = match self {
+            Ip::V4 => PUBLIC_IPV4,
+            Ip::V6 => PUBLIC_IPV6,
+            Ip::Local => {
+                let addr_str = format!("127.0.0.1:{}", port);
+                let addr = addr_str.parse::<SocketAddr>()?;
+                return Ok((addr, addr));
+            }
+        };
+
+        info!("Fetching IP information from {}", addr);
+
+        let res = format!("{}:{}", ureq::get(addr).call()?.into_string()?.trim(), port);
+        let display_addr = res.parse::<SocketAddr>()?;
+        let bind_addr = format!("0.0.0.0:{}", port).parse::<SocketAddr>()?;
+
+        debug!("IP: {}", res);
+
+        Ok((display_addr, bind_addr))
+    }
+}
+
+#[derive(Clone)]
+pub struct FileInfo {
+    pub name: String,
+    pub size: u64,
+    pub hash: String,
+}
+
+impl FileInfo {
+    pub fn new(name: String, size: u64, hash: String) -> Self {
+        Self { name, size, hash }
+    }
+}
+
+pub fn filepaths(
+    source: Option<PathBuf>,
+    files: Option<Vec<PathBuf>>,
+) -> Result<Vec<PathBuf>, Box<dyn Error>> {
+    info!("Collecting filepaths");
+
+    let mut paths = Vec::new();
+
+    if let Some(source) = source {
+        let home = env::var("HOME")?;
+        let content = fs::read_to_string(source)?;
+        paths = content
+            .lines()
+            .into_iter()
+            .map(|p| PathBuf::from(p.replace('~', &home)))
+            .collect();
+    } else if let Some(files) = files {
+        paths = files;
+    }
+
+    debug!("Filepaths collection finished (total: {})", paths.len());
+
+    Ok(paths)
+}
+
+pub async fn metadata(
+    files: &Vec<PathBuf>,
+) -> Result<(Vec<FileInfo>, HashMap<String, PathBuf>), Box<dyn Error>> {
+    info!("Collecting metadata");
+
+    let mut metadata = Vec::new();
+    let mut index = HashMap::new();
+
+    for path in files {
+        debug!("Collecting '{}' metadata", path.to_str().unwrap());
+
+        let split = path.to_str().unwrap().split('/').collect::<Vec<&str>>();
+        let name = split[split.len() - 1].to_string();
+        let handle = File::open(path).await?;
+        let size = handle.metadata().await?.len();
+        let hash = crypto::try_hash(path)?;
+
+        if size > 0 {
+            let info = FileInfo::new(name, size, hash.clone());
+            metadata.push(info);
+            index.insert(hash, path.clone());
+        }
+    }
+
+    debug!(
+        "Metadata collection successfully done (total: {})",
+        metadata.len()
+    );
+
+    Ok((metadata, index))
+}
+
+pub async fn new_file(
+    mut path: PathBuf,
+    name: &str,
+) -> Result<(BufWriter<File>, PathBuf), Box<dyn Error + Send + Sync>> {
+    debug!("New file handle for '{}'", name);
+
+    path.push(name);
+    let handle = File::create(&path).await?;
+
+    Ok((BufWriter::new(handle), path))
+}
+
+pub fn ascii() {
+    let ascii = "                    __                 
+  _________  ____  / /____  ____ _____ 
+ / ___/ __ \\/ __ \\/ __/ _ \\/ __ `/ __ \\
+/ /__/ /_/ / / / / /_/  __/ /_/ / /_/ /
+\\___/\\____/_/ /_/\\__/\\___/\\__, /\\____/ 
+                         /____/        ";
+    println!("{}\n", ascii);
+}
diff --git a/tests/data/.placeholder b/tests/data/.placeholder
new file mode 100644
index 0000000..e69de29
diff --git a/tests/output/.placeholder b/tests/output/.placeholder
new file mode 100644
index 0000000..e69de29
diff --git a/tests/sockets_integration.rs b/tests/sockets_integration.rs
new file mode 100644
index 0000000..b013620
--- /dev/null
+++ b/tests/sockets_integration.rs
@@ -0,0 +1,101 @@
+use std::{
+    fs::{self, File},
+    io::{BufWriter, Write},
+    path::PathBuf,
+    str::FromStr,
+};
+
+use contego::{
+    client::Client,
+    server::Server,
+    util::{metadata, Ip},
+};
+use env_logger::Env;
+use log::debug;
+use ntest::timeout;
+use rand::{distributions::Alphanumeric, thread_rng, Rng};
+use tokio::{fs::read_to_string, sync::mpsc};
+
+#[tokio::test]
+#[timeout(2000)]
+/// Ensures backend communications integrity & the ability to handle individual requests.
+async fn sockets_integration() {
+    env_logger::Builder::from_env(Env::default().default_filter_or("debug"))
+        .is_test(true)
+        .try_init()
+        .unwrap();
+
+    debug!("Initializing and starting the test");
+
+    let (testdata, paths) = testdata();
+    let (metadata, index) = metadata(&paths).await.unwrap();
+
+    let (display_addr, bind_addr) = Ip::Local.fetch(8080).unwrap();
+    let outdir = PathBuf::from("./tests/output/");
+    let key = String::from("testkey");
+    let c_key = key.clone();
+
+    let (tx, rx) = mpsc::channel::<()>(1);
+
+    let server_handle = tokio::spawn(async move {
+        debug!("Initializing the asynchronous server task");
+        let server = Server::new(display_addr, key, 8192, metadata, index);
+        debug!("Starting to listen to incoming connections");
+        server.start(rx, &bind_addr).await.unwrap();
+    });
+
+    let client_handle = tokio::spawn(async move {
+        debug!("Initializing the asynchronous client task");
+        let client = Client::new(display_addr, c_key, outdir);
+        debug!("Connecting to the server");
+        client.connection().await.unwrap();
+    });
+
+    client_handle.await.unwrap();
+    tx.send(()).await.unwrap();
+    server_handle.await.unwrap();
+
+    debug!("Checking for file integrity");
+
+    for file in testdata {
+        let path = String::from("./tests/output/") + file.0;
+        let recv_content = read_to_string(path).await.unwrap();
+
+        assert_eq!(
+            recv_content, file.1,
+            "Output '{}' doesn't match the input '{}'",
+            recv_content, file.1
+        );
+
+        fs::remove_file(String::from("./tests/output/") + file.0).unwrap();
+        fs::remove_file(String::from("./tests/data/") + file.0).unwrap();
+
+        debug!("File '{}' checked and removed successfully", file.0);
+    }
+}
+
+fn testdata() -> (Vec<(&'static str, String)>, Vec<PathBuf>) {
+    let mut paths = Vec::new();
+    let testdata = vec![
+        ("1.txt", generate_data()),
+        ("2.txt", generate_data()),
+        ("3.txt", generate_data()),
+    ];
+
+    for file in &testdata {
+        let filepath = PathBuf::from_str("./tests/data/").unwrap().join(file.0);
+        let mut writer = BufWriter::new(File::create(filepath.clone()).unwrap());
+        paths.push(filepath);
+        writer.write_all(file.1.as_bytes()).unwrap();
+    }
+
+    (testdata, paths)
+}
+
+fn generate_data() -> String {
+    thread_rng()
+        .sample_iter(&Alphanumeric)
+        .take(30)
+        .map(char::from)
+        .collect::<String>()
+}