Initial commit

.gitmodules

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+[submodule "client/liboqs"]
+	path = client/liboqs
+	url = https://github.com/open-quantum-safe/liboqs.git

LICENSE

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+Post-Quantum FTP (QP-FTPD)
+Copyright (C) 2025, Wonder Cohen BV The Hague, The Netherlands, https://wondercohen.com/ info@wondercohen.com 
+
+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.
+
+--------------------------------------------------------------------------------
+
+# Third-Party License: liboqs
+
+This software depends on the liboqs library, which is licensed under the MIT license.
+The following is a copy of the liboqs license:
+
+Copyright (c) 2016-2024 The Open Quantum Safe project authors
+
+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.

README.md

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+# Post-Quantum FTP (PQ-FTPD)
+
+A simple, secure file transfer utility using post-quantum cryptography for the key exchange. This project features a client-server architecture running inside Docker.
+
+## Features
+
+* **Post-Quantum Security**: Uses the **Kyber768** algorithm from the `liboqs` library to establish a secure channel, protecting against future quantum threats.
+* **Containerized Server**: The server runs in a Docker container for easy deployment and dependency management.
+* **CLI Interface**: The client provides a simple command-line interface for uploading files.
+* **Compression**: Uses `zlib` to compress files before transfer to save bandwidth.
+* **Authentication**: Implements a basic username/password authentication scheme.
+
+---
+## Prerequisites
+
+### Server (via Docker)
+* Docker
+* Docker Compose
+
+### Client (Local Machine)
+* A C++ compiler (`g++`)
+* `make`
+* `git`
+* `liboqs` installed locally (see build instructions).
+* `zlib` (`zlib1g-dev` on Debian/Ubuntu).
+
+---
+## How to Run
+
+### 1. Start the Server
+
+From the project's root directory, build and run the server using Docker Compose.
+
+```bash
+docker-compose up --build -d
+```
+* The `-d` flag runs the server in the background.
+* To view server logs: `docker-compose logs -f`
+* To stop the server: `docker-compose down`
+
+### 2. Build and Run the Client
+
+First, ensure you have the client-side dependencies installed.
+
+```bash
+# Install build tools and zlib
+sudo apt update
+sudo apt install g++ make git zlib1g-dev ninja-build cmake
+
+# Install liboqs
+git clone --branch 0.10.2 [https://github.com/open-quantum-safe/liboqs.git](https://github.com/open-quantum-safe/liboqs.git)
+cd liboqs
+mkdir build && cd build
+cmake -GNinja ..
+ninja
+sudo ninja install
+cd ../.. # Go back to project root
+```
+
+Now, navigate to the `client` directory and compile the client:
+
+```bash
+cd client
+make
+```
+
+Run the client:
+```bash
+./bin/client
+```
+---
+## Usage
+
+Once the client is running, you can use the following commands:
+
+* **Upload a file**:
+    ```
+    > put /path/to/your/local/file.txt
+    ```
+
+* **Exit the client**:
+    ```
+    > exit
+    ```
+Transferred files will appear in the `pq-ftp/server/transfer` directory on the host machine.
+
+---
+## License
+
+This project is licensed under the MIT License. See the `LICENSE` file for details.

client/Makefile

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+# pq-ftp/client/Makefile
+CXX=g++
+CXXFLAGS=-std=c++17 -Wall
+# You must have liboqs installed locally for this to work
+# sudo ninja install from the liboqs build directory
+LDFLAGS=-loqs -lz -lcrypto
+
+SRC_DIR=src
+BUILD_DIR=build
+BIN_DIR=bin
+TARGET=$(BIN_DIR)/client
+
+SRCS=$(wildcard $(SRC_DIR)/*.cpp)
+OBJS=$(patsubst $(SRC_DIR)/%.cpp, $(BUILD_DIR)/%.o, $(SRCS))
+
+all: $(TARGET)
+
+$(TARGET): $(OBJS)
+	@mkdir -p $(BIN_DIR)
+	$(CXX) $(OBJS) -o $(TARGET) $(LDFLAGS)
+	@echo "Client compiled successfully!"
+
+$(BUILD_DIR)/%.o: $(SRC_DIR)/%.cpp
+	@mkdir -p $(BUILD_DIR)
+	$(CXX) $(CXXFLAGS) -c $< -o $@
+
+clean:
+	rm -rf $(BUILD_DIR) $(BIN_DIR)

client/src/client.cpp

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+// pq-ftp/client/src/client.cpp
+#include <iostream>
+#include <string>
+#include <vector>
+#include <sys/socket.h>
+#include <arpa/inet.h>
+#include <unistd.h>
+#include <fstream>
+#include <sstream>
+
+#include <oqs/oqs.h>
+#include <zlib.h>
+
+#define SERVER_IP "127.0.0.1"
+#define PORT 2121
+#define BUFFER_SIZE 4096
+#define PQC_ALGORITHM "Kyber768"
+
+// Data compression function
+std::vector<uint8_t> compress_data(const std::vector<uint8_t>& data) {
+    if (data.empty()) return {};
+
+    uLongf compressed_size = compressBound(data.size());
+    std::vector<uint8_t> compressed_data(compressed_size);
+
+    if (compress(compressed_data.data(), &compressed_size, data.data(), data.size()) != Z_OK) {
+        std::cerr << "Compression failed!" << std::endl;
+        return {};
+    }
+    
+    compressed_data.resize(compressed_size);
+    return compressed_data;
+}
+
+
+int main() {
+    int sock = 0;
+    struct sockaddr_in serv_addr;
+
+    if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
+        std::cerr << "Socket creation error" << std::endl;
+        return -1;
+    }
+
+    serv_addr.sin_family = AF_INET;
+    serv_addr.sin_port = htons(PORT);
+
+    if (inet_pton(AF_INET, SERVER_IP, &serv_addr.sin_addr) <= 0) {
+        std::cerr << "Invalid address/ Address not supported" << std::endl;
+        return -1;
+    }
+
+    if (connect(sock, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0) {
+        std::cerr << "Connection Failed" << std::endl;
+        return -1;
+    }
+
+    std::cout << "Connected to server. Performing PQC key exchange..." << std::endl;
+
+    // 1. PQC Key Exchange
+    OQS_KEM *kem = NULL;
+    uint8_t *public_key = NULL;
+    uint8_t *ciphertext = NULL;
+    uint8_t *shared_secret_client = NULL;
+
+    kem = OQS_KEM_new(PQC_ALGORITHM);
+    if (kem == NULL) {
+        std::cerr << "Error: OQS_KEM_new failed." << std::endl;
+        return -1;
+    }
+    
+    public_key = new uint8_t[kem->length_public_key];
+    ciphertext = new uint8_t[kem->length_ciphertext];
+    shared_secret_client = new uint8_t[kem->length_shared_secret];
+
+    // Receive public key from server
+    recv(sock, public_key, kem->length_public_key, 0);
+
+    // Encapsulate to generate ciphertext and our shared secret
+    if (OQS_KEM_encaps(kem, ciphertext, shared_secret_client, public_key) != OQS_SUCCESS) {
+        std::cerr << "Error: OQS_KEM_encaps failed." << std::endl;
+        return -1;
+    }
+    
+    // Send ciphertext to server
+    send(sock, ciphertext, kem->length_ciphertext, 0);
+
+    std::cout << "PQC key exchange successful." << std::endl;
+    // NOTE: The shared_secret_client should be identical to the server's.
+
+    // 2. Authentication
+    std::cout << "Authenticating..." << std::endl;
+    std::string user = "user";
+    std::string pass = "pass";
+    send(sock, user.c_str(), user.length() + 1, 0);
+    send(sock, pass.c_str(), pass.length() + 1, 0);
+    
+    char auth_status[10] = {0};
+    recv(sock, auth_status, sizeof(auth_status), 0);
+    if (std::string(auth_status) != "OK") {
+        std::cerr << "Authentication failed. Server responded: " << auth_status << std::endl;
+        return -1;
+    }
+    std::cout << "Authentication successful!" << std::endl;
+    std::cout << "Commands: put <filepath>, get <filename>, exit" << std::endl;
+
+    // 3. Command Loop
+    for (std::string line; std::cout << "> " && std::getline(std::cin, line);) {
+        if (line.empty()) continue;
+        if (line == "exit") break;
+
+        std::stringstream ss(line);
+        std::string command, filepath;
+        ss >> command >> filepath;
+
+        if (command == "put") {
+            std::ifstream file(filepath, std::ios::binary | std::ios::ate);
+            if (!file.is_open()) {
+                std::cerr << "Error: Could not open file " << filepath << std::endl;
+                continue;
+            }
+
+            // Get file size
+            std::streamsize size = file.tellg();
+            file.seekg(0, std::ios::beg);
+
+            // Read file into a vector
+            std::vector<char> buffer(size);
+            if (!file.read(buffer.data(), size)) {
+                 std::cerr << "Error reading file." << std::endl;
+                 continue;
+            }
+            file.close();
+
+            // Convert char vector to uint8_t vector for compression
+            std::vector<uint8_t> data(buffer.begin(), buffer.end());
+            
+            // Compress the data
+            std::vector<uint8_t> compressed_data = compress_data(data);
+            std::cout << "Original size: " << data.size() << " bytes, Compressed size: " << compressed_data.size() << " bytes." << std::endl;
+
+            // Send command and filename
+            std::string put_command = "put " + filepath.substr(filepath.find_last_of("/\\") + 1);
+            send(sock, put_command.c_str(), put_command.length() + 1, 0);
+            
+            // Send file size
+            uint64_t compressed_size = compressed_data.size();
+            send(sock, &compressed_size, sizeof(compressed_size), 0);
+
+            // Send file data
+            send(sock, compressed_data.data(), compressed_data.size(), 0);
+            
+            std::cout << "File uploaded successfully." << std::endl;
+
+        } else if (command == "get") {
+            std::cout << "GET command is not implemented in this example." << std::endl;
+        } else {
+            std::cout << "Unknown command: " << command << std::endl;
+        }
+    }
+
+    // Cleanup
+    OQS_KEM_free(kem);
+    delete[] public_key;
+    delete[] ciphertext;
+    delete[] shared_secret_client;
+    close(sock);
+
+    return 0;
+}

client/testfile.txt

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+This is a post-quantum test file. This is a post-quantum test file.

docker-compose.yml

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+# pq-ftp/docker-compose.yml
+version: '3.8'
+
+services:
+  pq-server:
+    build: ./server
+    container_name: pq-ftp-server
+    restart: unless-stopped
+    ports:
+      - "2121:2121" # Expose port 2121 for file transfer
+    volumes:
+      - ./server/transfer:/transfer # Persist transferred files
+      - ./server/logs:/logs         # Persist logs

server/Dockerfile

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+# pq-ftp/server/Dockerfile
+
+# Base Image: Ubuntu 22.04
+FROM ubuntu:22.04
+
+# Avoid interactive prompts during installation
+ENV DEBIAN_FRONTEND=noninteractive
+
+# Install dependencies for building C++ and OQS
+# Install dependencies for building C++ and OQS
+RUN apt-get update && apt-get install -y \
+    git \
+    cmake \
+    g++ \
+    make \
+    libssl-dev \
+    zlib1g-dev \
+    ninja-build \
+    && rm -rf /var/lib/apt/lists/*
+
+# Clone and install liboqs
+WORKDIR /opt
+RUN git clone --branch 0.14.0 https://github.com/open-quantum-safe/liboqs.git
+WORKDIR /opt/liboqs
+RUN mkdir build && cd build && \
+    cmake -DOQS_USE_OPENSSL=OFF -GNinja .. && \
+    ninja && \
+    ninja install
+
+# Set up the working directory for our server code
+WORKDIR /app
+
+# Copy the server source code and Makefile
+COPY ./src /app/src
+COPY Makefile /app/
+
+# Compile the server
+RUN make
+
+# Create directories for transfers and logs
+RUN mkdir -p /transfer && mkdir -p /logs
+
+# Set the entrypoint for the container
+CMD [ "./bin/server" ]

server/Makefile

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+# pq-ftp/server/Makefile
+CXX=g++
+CXXFLAGS=-std=c++17 -Wall -pthread
+LDFLAGS=-loqs -lz
+
+SRC_DIR=src
+BUILD_DIR=build
+BIN_DIR=bin
+TARGET=$(BIN_DIR)/server
+
+SRCS=$(wildcard $(SRC_DIR)/*.cpp)
+OBJS=$(patsubst $(SRC_DIR)/%.cpp, $(BUILD_DIR)/%.o, $(SRCS))
+
+all: $(TARGET)
+
+$(TARGET): $(OBJS)
+	@mkdir -p $(BIN_DIR)
+	$(CXX) $(OBJS) -o $(TARGET) $(LDFLAGS)
+	@echo "Server compiled successfully!"
+
+$(BUILD_DIR)/%.o: $(SRC_DIR)/%.cpp
+	@mkdir -p $(BUILD_DIR)
+	$(CXX) $(CXXFLAGS) -c $< -o $@
+
+clean:
+	rm -rf $(BUILD_DIR) $(BIN_DIR)

server/logs/server.log

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+Mon Jul 21 13:53:06 2025
+: Server is listening on port 2121
+Mon Jul 21 14:06:28 2025
+: Client connected. Starting PQC key exchange...
+Mon Jul 21 14:06:28 2025
+: PQC key exchange successful. Shared secret established.
+Mon Jul 21 14:06:50 2025
+: Authentication failed for client.
+Mon Jul 21 14:06:51 2025
+: Client connected. Starting PQC key exchange...
+Mon Jul 21 14:06:51 2025
+: PQC key exchange successful. Shared secret established.
+Mon Jul 21 14:07:16 2025
+: Authentication failed for client.

server/src/server.cpp

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+// pq-ftp/server/src/server.cpp
+#include <iostream>
+#include <string>
+#include <vector>
+#include <thread>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <unistd.h>
+#include <fstream>
+#include <mutex>
+#include <cstring>
+
+// OQS for Post-Quantum Cryptography
+#include <oqs/oqs.h>
+
+// Zlib for compression
+#include <zlib.h>
+
+#define PORT 2121
+#define BUFFER_SIZE 4096
+#define PQC_ALGORITHM "Kyber768" // A NIST-selected KEM algorithm
+
+std::mutex log_mutex;
+
+// Simple logger
+void log(const std::string& message) {
+    std::lock_guard<std::mutex> guard(log_mutex);
+    std::ofstream log_file("/logs/server.log", std::ios_base::app);
+    time_t now = time(0);
+    char* dt = ctime(&now);
+    log_file << dt << ": " << message << std::endl;
+    std::cout << message << std::endl;
+}
+
+// Dummy authentication
+bool authenticate(int client_socket) {
+    // In a real system, use a secure challenge-response protocol!
+    char username[256] = {0};
+    char password[256] = {0};
+    
+    recv(client_socket, username, sizeof(username), 0);
+    recv(client_socket, password, sizeof(password), 0);
+    
+    // For this example, we accept any "user" with password "pass"
+    if (std::string(username) == "user" && std::string(password) == "pass") {
+        send(client_socket, "OK", 2, 0);
+        return true;
+    }
+    
+    send(client_socket, "FAIL", 4, 0);
+    return false;
+}
+
+// Data compression function
+std::vector<uint8_t> compress_data(const std::vector<uint8_t>& data) {
+    if (data.empty()) return {};
+
+    uLongf compressed_size = compressBound(data.size());
+    std::vector<uint8_t> compressed_data(compressed_size);
+
+    if (compress(compressed_data.data(), &compressed_size, data.data(), data.size()) != Z_OK) {
+        log("Compression failed!");
+        return {};
+    }
+    
+    compressed_data.resize(compressed_size);
+    return compressed_data;
+}
+
+
+void handle_client(int client_socket) {
+    log("Client connected. Starting PQC key exchange...");
+
+    // 1. PQC Key Exchange (using liboqs)
+    OQS_KEM *kem = NULL;
+    uint8_t *public_key = NULL;
+    uint8_t *secret_key = NULL;
+    uint8_t *ciphertext = NULL;
+    uint8_t *shared_secret_server = NULL;
+    
+    kem = OQS_KEM_new(PQC_ALGORITHM);
+    if (kem == NULL) {
+        log("Error: OQS_KEM_new failed for " + std::string(PQC_ALGORITHM));
+        close(client_socket);
+        return;
+    }
+
+    public_key = new uint8_t[kem->length_public_key];
+    secret_key = new uint8_t[kem->length_secret_key];
+    ciphertext = new uint8_t[kem->length_ciphertext];
+    shared_secret_server = new uint8_t[kem->length_shared_secret];
+
+    // Generate server's key pair
+    if (OQS_KEM_keypair(kem, public_key, secret_key) != OQS_SUCCESS) {
+        log("Error: OQS_KEM_keypair failed.");
+        // Cleanup would happen here
+        close(client_socket);
+        return;
+    }
+
+    // Send public key to client
+    send(client_socket, public_key, kem->length_public_key, 0);
+
+    // Receive ciphertext from client
+    recv(client_socket, ciphertext, kem->length_ciphertext, 0);
+    
+    // Decapsulate to get the shared secret
+    if (OQS_KEM_decaps(kem, shared_secret_server, ciphertext, secret_key) != OQS_SUCCESS) {
+        log("Error: OQS_KEM_decaps failed.");
+        // Cleanup
+        close(client_socket);
+        return;
+    }
+
+    log("PQC key exchange successful. Shared secret established.");
+    // NOTE: The shared_secret_server is now our symmetric session key.
+    // In a real application, you would derive further keys from this using a KDF.
+    // For simplicity, we are not encrypting the file transfer itself, just demonstrating the key exchange.
+
+    // 2. Authentication
+    if (!authenticate(client_socket)) {
+        log("Authentication failed for client.");
+        close(client_socket);
+        return;
+    }
+    log("Client authenticated successfully.");
+
+    // 3. Command Loop (API for scripting)
+    char buffer[BUFFER_SIZE] = {0};
+    while (recv(client_socket, buffer, BUFFER_SIZE, 0) > 0) {
+        std::string command(buffer);
+        log("Received command: " + command);
+        
+        if (command.rfind("put ", 0) == 0) { // Starts with "put "
+            std::string filename = "/transfer/" + command.substr(4);
+            log("Receiving file: " + filename);
+            
+            // Get file size
+            uint64_t file_size;
+            recv(client_socket, &file_size, sizeof(file_size), 0);
+            
+            std::ofstream outfile(filename, std::ios::binary);
+            char file_buffer[BUFFER_SIZE];
+            uint64_t bytes_received = 0;
+            
+            while (bytes_received < file_size) {
+                int bytes = recv(client_socket, file_buffer, std::min((uint64_t)BUFFER_SIZE, file_size - bytes_received), 0);
+                if (bytes <= 0) break;
+                outfile.write(file_buffer, bytes);
+                bytes_received += bytes;
+            }
+            outfile.close();
+            log("File received successfully.");
+        }
+        
+        // Clear buffer for next command
+        memset(buffer, 0, BUFFER_SIZE);
+    }
+    
+    log("Client disconnected.");
+    
+    // Cleanup OQS resources
+    OQS_KEM_free(kem);
+    delete[] public_key;
+    delete[] secret_key;
+    delete[] ciphertext;
+    delete[] shared_secret_server;
+    
+    close(client_socket);
+}
+
+int main() {
+    int server_fd;
+    struct sockaddr_in address;
+    int opt = 1;
+    int addrlen = sizeof(address);
+
+    // Creating socket file descriptor
+    if ((server_fd = socket(AF_INET, SOCK_STREAM, 0)) == 0) {
+        perror("socket failed");
+        exit(EXIT_FAILURE);
+    }
+
+    // Forcefully attaching socket to the port
+    if (setsockopt(server_fd, SOL_SOCKET, SO_REUSEADDR | SO_REUSEPORT, &opt, sizeof(opt))) {
+        perror("setsockopt");
+        exit(EXIT_FAILURE);
+    }
+    address.sin_family = AF_INET;
+    address.sin_addr.s_addr = INADDR_ANY;
+    address.sin_port = htons(PORT);
+
+    // Bind the socket to the network address and port
+    if (bind(server_fd, (struct sockaddr *)&address, sizeof(address)) < 0) {
+        perror("bind failed");
+        exit(EXIT_FAILURE);
+    }
+
+    // Start listening for connections
+    if (listen(server_fd, 10) < 0) {
+        perror("listen");
+        exit(EXIT_FAILURE);
+    }
+    
+    log("Server is listening on port " + std::to_string(PORT));
+    
+    while (true) {
+        int client_socket;
+        if ((client_socket = accept(server_fd, (struct sockaddr *)&address, (socklen_t*)&addrlen)) < 0) {
+            perror("accept");
+            continue; // Continue to next iteration instead of exiting
+        }
+        
+        // Create a new thread to handle the client connection
+        std::thread client_thread(handle_client, client_socket);
+        client_thread.detach(); // Detach the thread to handle clients concurrently
+    }
+
+    return 0;
+}