commit 17ef6107f1424829ce9d73c46b8b13434972fb02
Author: HoLLy <dario.db@hotmail.com>
Date:   Sat Sep 17 15:51:44 2022 +0200

    Create basic, functional git dumper

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ea8c4bf
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
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diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..babb886
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+++ b/Cargo.lock
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..8492cce
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,14 @@
+[package]
+name = "git-dumper"
+version = "0.1.0"
+edition = "2021"
+description = "A tool to dump exposed .git directories"
+
+[dependencies]
+anyhow = "1.0.65"
+clap = { version = "3.2", features = ["cargo"] }
+lazy_static = "1.4.0"
+miniz_oxide = "0.6.2"
+regex = "1.6"
+reqwest = "0.11"
+tokio = { version = "1.21", features = ["net", "sync", "rt", "rt-multi-thread", "macros"] }
diff --git a/src/dump_git.rs b/src/dump_git.rs
new file mode 100644
index 0000000..3572ee9
--- /dev/null
+++ b/src/dump_git.rs
@@ -0,0 +1,194 @@
+use std::{collections::HashSet, path::PathBuf};
+
+use regex::Regex;
+use reqwest::StatusCode;
+use tokio::sync::mpsc::{self, Sender};
+
+use crate::git_parsing::{parse_hash, parse_head, parse_object, GitObject};
+
+lazy_static::lazy_static! {
+    static ref REGEX_OBJECT_PATH: Regex = Regex::new(r"[\da-f]{2}/[\da-f]{38}").unwrap();
+}
+
+const START_FILES: &[&str] = &[
+    "info/exclude",
+    "logs/HEAD",
+    "objects/info/packs", // TODO: this does not seem to be present anymore?
+    "config",
+    "COMMIT_EDITMSG",
+    "description",
+    "FETCH_HEAD",
+    "HEAD",
+    "index",
+    "ORIG_HEAD",
+    "packed-refs",
+];
+
+// TODO: brute-force files based on known and unknown branch names
+
+#[derive(Default)]
+struct DownloadCache {
+    /// The URL of the exposed .git directory
+    base_url: String,
+    /// The local path to download the git repo to
+    base_path: PathBuf,
+    cache: HashSet<String>,
+}
+
+impl DownloadCache {
+    fn new(base_url: String, base_path: PathBuf) -> Self {
+        Self {
+            base_url,
+            base_path,
+            cache: HashSet::new(),
+        }
+    }
+
+    /// Downloads a file if it hasn't been downloaded before and sends it to the given channel.
+    fn download(&mut self, file_name: &str, sender: Sender<DownloadedFile>) {
+        if self.cache.contains(file_name) {
+            // println!("Skipping download of file {file_name} as it's already downloaded");
+            return;
+        }
+
+        self.cache.insert(file_name.into());
+
+        let url = format!("{}{file_name}", self.base_url);
+        let file_name = file_name.into();
+        tokio::spawn(async move {
+            let got = reqwest::get(&url).await;
+            match got {
+                Ok(resp) => {
+                    if resp.status() == StatusCode::OK {
+                        let bytes = resp.bytes().await.unwrap(); // TODO: ugh, fix this unwrap
+                        sender
+                            .send(DownloadedFile {
+                                name: file_name,
+                                content: bytes.to_vec(),
+                                sender: sender.clone(),
+                            })
+                            .await
+                            .unwrap();
+                    } else {
+                        println!(
+                            "Error while trying to download {url}: status code is {}",
+                            resp.status()
+                        );
+                    }
+                }
+                Err(e) => {
+                    println!("Error while trying to download {url}: {e}");
+                }
+            }
+        });
+    }
+
+    fn download_object(&mut self, object_hash: &str, sender: Sender<DownloadedFile>) {
+        let hash_start = &object_hash[0..2];
+        let hash_end = &object_hash[2..];
+        let path = format!("objects/{hash_start}/{hash_end}");
+        self.download(&path, sender)
+    }
+}
+
+#[derive(Debug)]
+struct DownloadedFile {
+    pub name: String,
+    pub content: Vec<u8>,
+    pub sender: Sender<DownloadedFile>,
+}
+
+pub async fn download_all(base_url: String, base_path: PathBuf) {
+    let mut cache = DownloadCache::new(base_url, base_path);
+
+    // TODO: try out unbounded channel too
+    // TODO: maybe just have a cli option that determines the limit of concurrent downloads instead?
+    let (tx, mut rx) = mpsc::channel(32);
+
+    for &file in START_FILES {
+        let new_tx = tx.clone();
+        cache.download(file, new_tx);
+    }
+
+    // drop the sender object so all senders can be out of scope by the end of the download
+    drop(tx);
+
+    // every time we downloaded a new file, see what other files we can derive from it
+    while let Some(message) = rx.recv().await {
+        // write this file to disk
+        let path = cache.base_path.join(".git").join(&message.name);
+        let path_parent = path
+            .parent()
+            .expect("There should be at least .git as parent");
+
+        std::fs::create_dir_all(path_parent).unwrap_or_else(|e| {
+            println!(
+                "Error while trying to create directory {}: {:?}",
+                path_parent.to_string_lossy(),
+                e
+            );
+        });
+        std::fs::write(path, &message.content).unwrap_or_else(|e| {
+            println!(
+                "Error while trying to write {} to disk: {:?}",
+                message.name, e
+            );
+        });
+
+        println!(
+            "Downloaded '{}' ({} bytes)",
+            message.name,
+            message.content.len()
+        );
+
+        match message.name.as_str() {
+            "HEAD" => match parse_head(&message.content) {
+                Ok(ref_path) => {
+                    println!("\tFound ref path {ref_path}");
+                    cache.download(ref_path, message.sender.clone());
+                }
+                Err(err) => todo!("{:?}", err),
+            },
+            "ORIG_HEAD" => match parse_hash(&message.content) {
+                Ok(hash) => {
+                    println!("\tFound object hash {hash}");
+                    cache.download_object(hash, message.sender.clone());
+                }
+                Err(err) => todo!("{:?}", err),
+            },
+            n if n.starts_with("refs/heads/") => match parse_hash(&message.content) {
+                Ok(hash) => {
+                    println!("\tFound object hash {hash}");
+                    let hash_start = &hash[0..2];
+                    let hash_end = &hash[2..];
+                    let path = format!("objects/{hash_start}/{hash_end}");
+                    cache.download(&path, message.sender.clone());
+                }
+                Err(err) => todo!("{:?}", err),
+            },
+            n if n.starts_with("objects/") && REGEX_OBJECT_PATH.is_match(n) => {
+                match parse_object(&message.content) {
+                    Ok(GitObject::Blob) => {
+                        println!("\tFound blob object");
+                    }
+                    Ok(GitObject::Tree(hashes)) => {
+                        println!("\tFound tree object with {} hashes", hashes.len());
+                        for hash in hashes {
+                            cache.download_object(&hash, message.sender.clone());
+                        }
+                    }
+                    Ok(GitObject::Commit(hashes)) => {
+                        println!("\tFound commit object with {} hashes", hashes.len());
+                        for hash in hashes {
+                            cache.download_object(&hash, message.sender.clone());
+                        }
+                    }
+                    Err(err) => todo!("{:?}", err),
+                }
+            }
+            n => {
+                println!("\tNot using file '{n}' for anything right now");
+            }
+        }
+    }
+}
diff --git a/src/git_parsing.rs b/src/git_parsing.rs
new file mode 100644
index 0000000..e8eebeb
--- /dev/null
+++ b/src/git_parsing.rs
@@ -0,0 +1,172 @@
+use anyhow::{anyhow, bail, Result};
+use miniz_oxide::inflate::TINFLStatus;
+use regex::Regex;
+use std::fmt::Write;
+
+lazy_static::lazy_static! {
+    static ref REGEX_HASH: Regex = Regex::new(r"[a-f\d]{40}").unwrap();
+    static ref REGEX_REFS_PATH: Regex = Regex::new(r"refs/heads/(\S+)").unwrap();
+}
+
+pub enum GitObject {
+    Tree(Vec<String>),
+    Commit(Vec<String>),
+    Blob,
+}
+
+pub fn parse_head(data: &[u8]) -> Result<&str> {
+    let content = std::str::from_utf8(data)?;
+
+    if !content.starts_with("ref: ") {
+        bail!("HEAD file must start with \"ref: \"");
+    }
+
+    let content = (&content[5..]).trim_end();
+
+    if !REGEX_REFS_PATH.is_match(content) {
+        bail!("Failed to match refs path in HEAD file");
+    }
+
+    Ok(content)
+}
+
+pub fn parse_hash(data: &[u8]) -> Result<&str> {
+    let content = std::str::from_utf8(data)?;
+    let content = content.trim_end();
+
+    if !REGEX_HASH.is_match(content) {
+        bail!("Failed to match hash");
+    }
+
+    Ok(content)
+}
+
+pub fn parse_object(data: &[u8]) -> Result<GitObject> {
+    let peek = peek_object_type(data)?;
+    match peek {
+        [b'b', b'l', b'o', b'b', _, _] => Ok(GitObject::Blob),
+        [b't', b'r', b'e', b'e', _, _] => {
+            let decompressed = miniz_oxide::inflate::decompress_to_vec_zlib(data)
+                .map_err(|e| anyhow!("Problem while decompressing git object: {}", e))?;
+            let decompressed = decompressed.as_slice();
+
+            let mut hashes = vec![];
+
+            // TODO: this is ugly, use a slice-based approach instead
+            let mut decompressed_iter = split_object_at_zero(decompressed)?.iter().peekable();
+            while decompressed_iter.peek().is_some() {
+                let bytes: Vec<u8> = (&mut decompressed_iter)
+                    .skip_while(|&&b| b != b'\0')
+                    .skip(1)
+                    .take(0x14)
+                    .cloned()
+                    .collect();
+                hashes.push(slice_to_hex(&bytes));
+            }
+
+            Ok(GitObject::Tree(hashes))
+        }
+        [b'c', b'o', b'm', b'm', b'i', b't'] => {
+            let decompressed = miniz_oxide::inflate::decompress_to_vec_zlib(data)
+                .map_err(|e| anyhow!("Problem while decompressing git object: {}", e))?;
+
+            let decompressed = split_object_at_zero(&decompressed)?;
+            let commit_message = String::from_utf8_lossy(decompressed);
+
+            let hashes = commit_message
+                .lines()
+                .take_while(|&line| !line.trim().is_empty())
+                .filter_map(|line| match line.split_once(' ') {
+                    Some(("tree", hash)) => Some(hash.into()),
+                    Some(("parent", hash)) => Some(hash.into()),
+                    _ => None,
+                })
+                .collect();
+
+            Ok(GitObject::Commit(hashes))
+        }
+        _ => bail!(
+            "Unknown git object header: {}",
+            String::from_utf8_lossy(&peek)
+        ),
+    }
+}
+
+fn peek_object_type(data: &[u8]) -> Result<[u8; 6]> {
+    let mut array = [0u8; 6];
+    match miniz_oxide::inflate::decompress_slice_iter_to_slice(
+        &mut array,
+        data.chunks(16),
+        true,
+        true,
+    ) {
+        Ok(_) | Err(TINFLStatus::HasMoreOutput) => Ok(array),
+        Err(e) => bail!("Error while decompressing object file: {:?}", e),
+    }
+}
+
+fn split_object_at_zero(data: &[u8]) -> Result<&[u8]> {
+    let idx_zero = data
+        .iter()
+        .enumerate()
+        .find(|(_, &val)| val == b'\0')
+        .map(|(idx, _)| idx)
+        .ok_or_else(|| anyhow!("Malformed object file, could not find null separator"))?;
+    let data = &data[idx_zero + 1..];
+    Ok(data)
+}
+
+fn slice_to_hex(data: &[u8]) -> String {
+    let mut s = String::with_capacity(data.len() * 2);
+    for byte in data {
+        write!(s, "{:02x}", byte).expect("writing hex should not fail");
+    }
+    s
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn parse_commit_blob() {
+        let bytes = include_bytes!("../test-data/object-blob");
+        let parsed = parse_object(bytes).unwrap();
+        assert!(matches!(parsed, GitObject::Blob));
+    }
+
+    #[test]
+    fn parse_tree_object() {
+        let bytes = include_bytes!("../test-data/object-tree");
+        let parsed = parse_object(bytes).unwrap();
+        assert!(matches!(parsed, GitObject::Tree(_)));
+
+        if let GitObject::Tree(vec) = parsed {
+            assert_eq!(
+                vec,
+                vec![
+                    "93748a31e8df89b80ab5ebe4ad19ea62899a28fa".to_string(),
+                    "920512d27e4df0c79ca4a929bc5d4254b3d05c4c".to_string(),
+                    "f5463e0d810357c84bdb956dcfe70b8015d6fb24".to_string(),
+                ]
+            );
+        }
+    }
+
+    #[test]
+    fn parse_commit_object() {
+        let bytes = include_bytes!("../test-data/object-commit");
+        let parsed = parse_object(bytes).unwrap();
+        assert!(matches!(parsed, GitObject::Commit(_)));
+
+        if let GitObject::Commit(vec) = parsed {
+            assert_eq!(
+                vec,
+                vec![
+                    "faf660b3b793f359495ad23ea2c449da6b3b64a0".to_string(),
+                    "1712bc7d3a0e6cf9920541e616310bd30f431728".to_string(),
+                ]
+            );
+        }
+    }
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..66d20f0
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,37 @@
+use std::path::PathBuf;
+
+use clap::{command, Arg, Command};
+
+mod dump_git;
+mod git_parsing;
+
+fn cli() -> Command<'static> {
+    command!()
+        .arg(
+            Arg::new("URL")
+                .required(true)
+                .help("The url of the exposed .git directory"),
+        )
+        .arg(
+            Arg::new("PATH")
+                .required(false)
+                .help("The directory to download to")
+                .default_value("git-dumped"),
+        )
+}
+
+#[tokio::main]
+async fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let matches = cli().get_matches();
+    let url = matches.get_one::<String>("URL").unwrap();
+    let path = matches.get_one::<String>("PATH").unwrap();
+
+    // println!("URL: {url}");
+    // println!("PATH: {path}");
+
+    std::fs::create_dir_all(format!("{path}/.git/"))?;
+
+    dump_git::download_all(url.clone(), PathBuf::from(path)).await;
+
+    Ok(())
+}
diff --git a/test-data/object-blob b/test-data/object-blob
new file mode 100644
index 0000000..2800656
Binary files /dev/null and b/test-data/object-blob differ
diff --git a/test-data/object-commit b/test-data/object-commit
new file mode 100644
index 0000000..5b9b1e9
Binary files /dev/null and b/test-data/object-commit differ
diff --git a/test-data/object-tree b/test-data/object-tree
new file mode 100644
index 0000000..00d86dc
Binary files /dev/null and b/test-data/object-tree differ