initial rust

Signed-off-by: Tycho Andersen <tycho@tycho.pizza>

diff --git a/.gitignore b/.gitignore
index 80cc16c49ea56fcbc0238f8e54bf28aaba6744a6..d1032460ac479a6086c7abd2d90a1bf61a277c01 100644 (file)
--- a/.gitignore
+++ b/.gitignore
@@ -48,3 +48,8 @@ Makefile.in
 /shadow.spec
 /shadow-*.tar.*
 /libmisc/getdate.c
+
+
+# Added by cargo
+
+/target

diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644 (file)
index 0000000..0fb9244
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,297 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
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+
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644 (file)
index 0000000..998196f
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,9 @@
+[package]
+name = "shadow"
+version = "0.1.0"
+edition = "2018"
+
+[dependencies]
+anyhow = "*"
+clap = "3.0.0-beta.2"
+nix = "*"

diff --git a/Makefile.rust b/Makefile.rust
new file mode 100644 (file)
index 0000000..1574de5
--- /dev/null
+++ b/Makefile.rust
@@ -0,0 +1,21 @@
+SRC=$(shell find . -name \*.rs | grep -v "^./target")
+
+target/debug/passwd: Cargo.toml $(SRC)
+       cargo build
+
+.PHONY: check
+check:
+       RUST_BACKTRACE=1 cargo test -- --nocapture
+
+.PHONY: lint
+lint: $(SRC)
+       rustfmt --check $(SRC)
+       cargo clippy --all-targets --all-features -- -D warnings -A clippy::upper-case-acronyms
+
+.PHONY: fmt
+fmt:
+       rustfmt --emit files $(SRC)
+
+.PHONY: clean
+clean:
+       -cargo clean

diff --git a/src/bin/passwd.rs b/src/bin/passwd.rs
new file mode 100644 (file)
index 0000000..c5276bb
--- /dev/null
+++ b/src/bin/passwd.rs
@@ -0,0 +1,121 @@
+#[macro_use]
+extern crate anyhow;
+extern crate clap;
+extern crate nix;
+
+use std::env;
+use std::fs;
+use std::path::Path;
+use std::process::exit;
+
+use clap::{Clap, ErrorKind, IntoApp};
+use nix::unistd::{chroot, Uid};
+
+const E_SUCCESS: i32 = 0; /* success */
+const E_NOPERM: i32 = 1; /* permission denied */
+const E_USAGE: i32 = 2; /* invalid combination of options */
+const E_FAILURE: i32 = 3; /* unexpected failure, nothing done */
+const E_MISSING: i32 = 4; /* unexpected failure, passwd file missing */
+const E_PWDBUSY: i32 = 5; /* passwd file busy, try again later */
+const E_BAD_ARG: i32 = 6; /* invalid argument to option */
+
+#[derive(Clap, Debug)]
+#[clap(version = "0.0.0-rust")]
+struct Opts {
+    // TODO: find a better way to aggregate all other args?
+    #[clap(short, long, requires = "status", conflicts_with_all = &["delete", "expire"])]
+    all: bool,
+
+    #[clap(short, long)]
+    delete: bool,
+
+    #[clap(short, long)]
+    expire: bool,
+
+    #[clap(short, long)]
+    help: bool,
+
+    #[clap(short, long)]
+    keep_tokens: bool,
+
+    #[clap(short, long)]
+    inactive: Option<u64>,
+
+    #[clap(short, long)]
+    lock: bool,
+
+    #[clap(short = 'n', long)]
+    mindays: Option<u64>,
+
+    #[clap(short, long)]
+    quiet: bool,
+
+    #[clap(short, long)]
+    repository: Option<String>,
+
+    #[clap(short = 'R', long)]
+    root: Option<String>,
+
+    #[clap(short = 'S', long)]
+    status: bool,
+
+    login: Option<String>,
+}
+
+fn do_chroot(newroot: &Path) -> anyhow::Result<()> {
+    if !newroot.is_absolute() {
+        bail!("{:?} is not an absolute path", newroot)
+    }
+
+    if let Err(e) = fs::symlink_metadata(newroot) {
+        bail!("cannot access {:?}: {}", newroot, e)
+    }
+
+    env::set_current_dir(newroot)?;
+    Ok(chroot(newroot)?)
+}
+
+fn main() {
+    let opts = Opts::try_parse().unwrap_or_else(|e| {
+        match e.kind {
+            ErrorKind::DisplayHelp => {
+                Opts::into_app().print_long_help().unwrap_or_else(|e| {
+                    eprintln!("failed to render help: {}", e);
+                    exit(E_FAILURE)
+                });
+                exit(E_SUCCESS)
+            },
+            ErrorKind::UnknownArgument => exit(E_BAD_ARG),
+            ErrorKind::InvalidValue => exit(E_BAD_ARG),
+            _ => exit(E_USAGE),
+        }
+    });
+
+    if let Some(newroot) = opts.root {
+        do_chroot(Path::new(&newroot)).unwrap_or_else(|e| {
+            eprintln!("failed to chroot: {}", e);
+            exit(E_FAILURE)
+        })
+    }
+
+    // TODO: openlog()
+    // sanitize environment
+
+    let amroot = Uid::effective().is_root();
+
+    if opts.all {
+        if !amroot {
+            exit(E_NOPERM)
+        }
+
+        todo!()
+    }
+
+    let _name = opts.login.unwrap_or_else(|| {
+        // need to implement get_my_pwent(); or really just libc::getlogin(), but it sucks that
+        // it's unsafe...
+        todo!()
+    });
+
+    exit(E_SUCCESS)
+}