phase 6

Cargo.lock

@@ -160,6 +160,12 @@ version = "1.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c08606f8c3cbf4ce6ec8e28fb0014a2c086708fe954eaa885384a6165172e7e8"
 
+[[package]]
+name = "base16ct"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4c7f02d4ea65f2c1853089ffd8d2787bdbc63de2f0d29dedbcf8ccdfa0ccd4cf"
+
 [[package]]
 name = "base64"
 version = "0.21.7"
@@ -367,6 +373,18 @@ dependencies = [
  "cfg-if",
 ]
 
+[[package]]
+name = "crypto-bigint"
+version = "0.5.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0dc92fb57ca44df6db8059111ab3af99a63d5d0f8375d9972e319a379c6bab76"
+dependencies = [
+ "generic-array",
+ "rand_core",
+ "subtle",
+ "zeroize",
+]
+
 [[package]]
 name = "crypto-common"
 version = "0.1.7"
@@ -396,6 +414,7 @@ dependencies = [
  "cfg-if",
  "cpufeatures",
  "curve25519-dalek-derive",
+ "digest",
  "fiat-crypto",
  "rustc_version",
  "subtle",
@@ -453,9 +472,65 @@ dependencies = [
  "age",
  "clap",
  "flate2",
+ "rand",
+ "ssh-key",
  "tar",
 ]
 
+[[package]]
+name = "ecdsa"
+version = "0.16.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ee27f32b5c5292967d2d4a9d7f1e0b0aed2c15daded5a60300e4abb9d8020bca"
+dependencies = [
+ "der",
+ "digest",
+ "elliptic-curve",
+ "rfc6979",
+ "signature",
+ "spki",
+]
+
+[[package]]
+name = "ed25519"
+version = "2.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "115531babc129696a58c64a4fef0a8bf9e9698629fb97e9e40767d235cfbcd53"
+dependencies = [
+ "signature",
+]
+
+[[package]]
+name = "ed25519-dalek"
+version = "2.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "70e796c081cee67dc755e1a36a0a172b897fab85fc3f6bc48307991f64e4eca9"
+dependencies = [
+ "curve25519-dalek",
+ "ed25519",
+ "sha2",
+ "subtle",
+]
+
+[[package]]
+name = "elliptic-curve"
+version = "0.13.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b5e6043086bf7973472e0c7dff2142ea0b680d30e18d9cc40f267efbf222bd47"
+dependencies = [
+ "base16ct",
+ "crypto-bigint",
+ "digest",
+ "ff",
+ "generic-array",
+ "group",
+ "pkcs8",
+ "rand_core",
+ "sec1",
+ "subtle",
+ "zeroize",
+]
+
 [[package]]
 name = "errno"
 version = "0.3.14"
@@ -466,6 +541,16 @@ dependencies = [
  "windows-sys",
 ]
 
+[[package]]
+name = "ff"
+version = "0.13.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c0b50bfb653653f9ca9095b427bed08ab8d75a137839d9ad64eb11810d5b6393"
+dependencies = [
+ "rand_core",
+ "subtle",
+]
+
 [[package]]
 name = "fiat-crypto"
 version = "0.2.9"
@@ -641,6 +726,7 @@ checksum = "85649ca51fd72272d7821adaf274ad91c288277713d9c18820d8499a7ff69e9a"
 dependencies = [
  "typenum",
  "version_check",
+ "zeroize",
 ]
 
 [[package]]
@@ -664,6 +750,17 @@ dependencies = [
  "polyval",
 ]
 
+[[package]]
+name = "group"
+version = "0.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f0f9ef7462f7c099f518d754361858f86d8a07af53ba9af0fe635bbccb151a63"
+dependencies = [
+ "ff",
+ "rand_core",
+ "subtle",
+]
+
 [[package]]
 name = "heck"
 version = "0.5.0"
@@ -927,6 +1024,44 @@ version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c08d65885ee38876c4f86fa503fb49d7b507c2b62552df7c70b2fce627e06381"
 
+[[package]]
+name = "p256"
+version = "0.13.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c9863ad85fa8f4460f9c48cb909d38a0d689dba1f6f6988a5e3e0d31071bcd4b"
+dependencies = [
+ "ecdsa",
+ "elliptic-curve",
+ "primeorder",
+ "sha2",
+]
+
+[[package]]
+name = "p384"
+version = "0.13.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fe42f1670a52a47d448f14b6a5c61dd78fce51856e68edaa38f7ae3a46b8d6b6"
+dependencies = [
+ "ecdsa",
+ "elliptic-curve",
+ "primeorder",
+ "sha2",
+]
+
+[[package]]
+name = "p521"
+version = "0.13.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0fc9e2161f1f215afdfce23677034ae137bbd45016a880c2eb3ba8eb95f085b2"
+dependencies = [
+ "base16ct",
+ "ecdsa",
+ "elliptic-curve",
+ "primeorder",
+ "rand_core",
+ "sha2",
+]
+
 [[package]]
 name = "parking_lot"
 version = "0.12.5"
@@ -960,6 +1095,15 @@ dependencies = [
  "hmac",
 ]
 
+[[package]]
+name = "pem-rfc7468"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "88b39c9bfcfc231068454382784bb460aae594343fb030d46e9f50a645418412"
+dependencies = [
+ "base64ct",
+]
+
 [[package]]
 name = "pin-project"
 version = "1.1.12"
@@ -1039,6 +1183,15 @@ dependencies = [
  "zerocopy",
 ]
 
+[[package]]
+name = "primeorder"
+version = "0.13.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "353e1ca18966c16d9deb1c69278edbc5f194139612772bd9537af60ac231e1e6"
+dependencies = [
+ "elliptic-curve",
+]
+
 [[package]]
 name = "proc-macro-error-attr2"
 version = "2.0.0"
@@ -1118,6 +1271,16 @@ dependencies = [
  "bitflags",
 ]
 
+[[package]]
+name = "rfc6979"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f8dd2a808d456c4a54e300a23e9f5a67e122c3024119acbfd73e3bf664491cb2"
+dependencies = [
+ "hmac",
+ "subtle",
+]
+
 [[package]]
 name = "rsa"
 version = "0.9.10"
@@ -1132,6 +1295,7 @@ dependencies = [
  "pkcs1",
  "pkcs8",
  "rand_core",
+ "sha2",
  "signature",
  "spki",
  "subtle",
@@ -1247,6 +1411,20 @@ dependencies = [
  "sha2",
 ]
 
+[[package]]
+name = "sec1"
+version = "0.7.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d3e97a565f76233a6003f9f5c54be1d9c5bdfa3eccfb189469f11ec4901c47dc"
+dependencies = [
+ "base16ct",
+ "der",
+ "generic-array",
+ "pkcs8",
+ "subtle",
+ "zeroize",
+]
+
 [[package]]
 name = "secrecy"
 version = "0.10.3"
@@ -1362,6 +1540,48 @@ dependencies = [
  "der",
 ]
 
+[[package]]
+name = "ssh-cipher"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "caac132742f0d33c3af65bfcde7f6aa8f62f0e991d80db99149eb9d44708784f"
+dependencies = [
+ "cipher",
+ "ssh-encoding",
+]
+
+[[package]]
+name = "ssh-encoding"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "eb9242b9ef4108a78e8cd1a2c98e193ef372437f8c22be363075233321dd4a15"
+dependencies = [
+ "base64ct",
+ "pem-rfc7468",
+ "sha2",
+]
+
+[[package]]
+name = "ssh-key"
+version = "0.6.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3b86f5297f0f04d08cabaa0f6bff7cb6aec4d9c3b49d87990d63da9d9156a8c3"
+dependencies = [
+ "ed25519-dalek",
+ "p256",
+ "p384",
+ "p521",
+ "rand_core",
+ "rsa",
+ "sec1",
+ "sha2",
+ "signature",
+ "ssh-cipher",
+ "ssh-encoding",
+ "subtle",
+ "zeroize",
+]
+
 [[package]]
 name = "strsim"
 version = "0.11.1"

Cargo.toml

@@ -7,4 +7,6 @@ edition = "2024"
 age = { version = "0.11.3", features = ["ssh"] }
 clap = { version = "4.6.1", features = ["derive"] }
 flate2 = "1.1.9"
+rand = "0.8"
+ssh-key = { version = "0.6", features = ["ed25519", "getrandom"] }
 tar = "0.4.45"

plans/phase6.md

@@ -0,0 +1,12 @@
+# Phase 6
+
+For phase 6, the app is almost finished but I want to include a couple quality of life features:
+
+- If the user runs `drawer open somedrawer.drawer`, this is currently an error because there is no target path given.
+If the file basename of the drawer path would be a valid target path (`./somedrawer` in this case) then use that as the
+target path, but also print to stdout that that's what it's using. This should still not open the drawer if the target
+path exists and is nonempty, unless the user passes `-f`
+
+- Add a new command, `drawer key <filename>` which will create a new key and store it in the given filename. Before
+creating the new key, make sure the filename does not exist and is writable. This will need a good source of entropy to
+generate a key, so as part of your plan, recommend one.

src/error.rs

@@ -17,6 +17,8 @@ pub enum DrawerError {
     EncryptFailed,
     DecryptFailed(PathBuf, PathBuf),
     UntarFailed,
+    KeyOutputFailed(PathBuf),
+    KeyGenerateFailed,
 }
 
 impl fmt::Display for DrawerError {
@@ -24,7 +26,7 @@ impl fmt::Display for DrawerError {
         match self {
             DrawerError::ParseError(s) => write!(f, "{s}"),
             DrawerError::NoKeyPath => write!(f, "no key specified: set $DRAWER_KEY or use -i"),
-            DrawerError::DrawerFileInvalidExtension(p) => write!(f, "drawer file must have a .drawer extension: {}", p.display()),
+            DrawerError::DrawerFileInvalidExtension(p) => write!(f, "drawer file must end in .drawer: {}", p.display()),
             DrawerError::DrawerFileNotFound(p) => write!(f, "drawer file not found: {}", p.display()),
             DrawerError::TargetInvalid(p) => write!(f, "target path does not exist, is not a directory, or is not readable: {}", p.display()),
             DrawerError::KeyInvalid(p) => write!(f, "key not found or not readable: {}", p.display()),
@@ -36,6 +38,8 @@ impl fmt::Display for DrawerError {
             DrawerError::EncryptFailed => write!(f, "encryption failed"),
             DrawerError::DecryptFailed(drawer, key) => write!(f, "failed to decrypt {} with key {}", drawer.display(), key.display()),
             DrawerError::UntarFailed => write!(f, "drawer file does not contain a valid archive"),
+            DrawerError::KeyOutputFailed(p) => write!(f, "cannot create key file: {} (already exists or directory is not writable)", p.display()),
+            DrawerError::KeyGenerateFailed => write!(f, "failed to generate key"),
         }
     }
 }

src/main.rs

@@ -31,6 +31,7 @@ mod tests {
                 drawer_file: "blah.drawer".into(),
                 key: Path("foo.key".into()),
                 target_path: "blah".into(),
+                target_inferred: false,
                 force: false,
             }
         ))
@@ -45,6 +46,22 @@ mod tests {
                 drawer_file: "blah.drawer".into(),
                 key: Path("foo.key".into()),
                 target_path: "blah".into(),
+                target_inferred: false,
+                force: false,
+            }
+        ))
+    }
+
+    #[test]
+    fn test_inferred_open() {
+        let op = parse_args(vec!["drawer", "open", "blah.drawer", "-i", "foo.key"]);
+        assert_eq!(op, Ok(
+            DrawerOperation {
+                operation_type: Open,
+                drawer_file: "blah.drawer".into(),
+                key: Path("foo.key".into()),
+                target_path: "blah".into(),
+                target_inferred: true,
                 force: false,
             }
         ))

src/parsing.rs

@@ -6,6 +6,7 @@ use flate2::Compression;
 use flate2::read::GzDecoder;
 use flate2::write::GzEncoder;
 use clap::{Parser, Subcommand};
+use ssh_key::{Algorithm, LineEnding, PrivateKey};
 use crate::error::DrawerError;
 use crate::parsing::KeyType::*;
 
@@ -13,6 +14,7 @@ use crate::parsing::KeyType::*;
 pub enum OperationType {
     Open,
     Close,
+    Key,
 }
 
 #[derive(Debug, PartialEq)]
@@ -22,6 +24,7 @@ pub struct DrawerOperation {
     pub key: KeyType,
     pub target_path: PathBuf,
     pub force: bool,
+    pub target_inferred: bool,
 }
 
 #[derive(Debug, PartialEq)]
@@ -52,6 +55,9 @@ enum Command {
         #[arg(short = 'i')]
         key: Option<PathBuf>,
     },
+    Key {
+        filename: PathBuf,
+    },
 }
 
 pub fn parse_args<I, T>(args: I) -> Result<DrawerOperation, DrawerError>
@@ -65,15 +71,17 @@ where
     match cli.command {
         Command::Open { drawer_file, target_path, key, force } => {
             let key = resolve_key(key);
-            let target = target_path.unwrap_or_else(|| {
+            let (target, target_inferred) = match target_path {
-                PathBuf::from(drawer_file.file_stem().unwrap_or_default())
+                Some(p) => (p, false),
-            });
+                None => (PathBuf::from(drawer_file.file_stem().unwrap_or_default()), true),
+            };
             Ok(DrawerOperation {
                 operation_type: OperationType::Open,
                 drawer_file,
                 key,
                 target_path: target,
                 force,
+                target_inferred,
             })
         }
         Command::Close { drawer_file, target_path, key } => {
@@ -85,6 +93,17 @@ where
                 key,
                 target_path: target,
                 force: false,
+                target_inferred: false,
+            })
+        }
+        Command::Key { filename } => {
+            Ok(DrawerOperation {
+                operation_type: OperationType::Key,
+                drawer_file: filename,
+                key: KeyType::EnvVar,
+                target_path: PathBuf::from("."),
+                force: false,
+                target_inferred: false,
             })
         }
     }
@@ -103,10 +122,14 @@ impl DrawerOperation {
         match self.operation_type {
             OperationType::Open => self.perform_open(),
             OperationType::Close => self.perform_close(),
+            OperationType::Key => self.perform_key(),
         }
     }
 
     fn perform_open(&self) -> Result<(), DrawerError> {
+        if self.target_inferred {
+            println!("(assuming into {})", self.target_path.display());
+        }
         let encrypted = std::fs::read(&self.drawer_file)
             .map_err(|_| DrawerError::DrawerFileNotFound(self.drawer_file.clone()))?;
 
@@ -179,16 +202,39 @@ impl DrawerOperation {
     }
 
     pub fn validate(&self) -> Result<(), DrawerError> {
+        if self.operation_type != OperationType::Key {
             if self.drawer_file.extension().and_then(|e| e.to_str()) != Some("drawer") {
                 return Err(DrawerError::DrawerFileInvalidExtension(self.drawer_file.clone()));
             }
             self.validate_key()?;
+        }
         match self.operation_type {
             OperationType::Open => self.validate_open(),
             OperationType::Close => self.validate_close(),
+            OperationType::Key => self.validate_key_gen(),
         }
     }
 
+    fn validate_key_gen(&self) -> Result<(), DrawerError> {
+        if self.drawer_file.exists() {
+            return Err(DrawerError::KeyOutputFailed(self.drawer_file.clone()));
+        }
+        let parent = match self.drawer_file.parent() {
+            None => Path::new("."),
+            Some(p) => {
+                if p == Path::new("") {
+                    Path::new(".")
+                } else {
+                    p
+                }
+            },
+        };
+        if !parent.exists() {
+            return Err(DrawerError::KeyOutputFailed(self.drawer_file.clone()));
+        }
+        Ok(())
+    }
+
     fn key_path(&self) -> Result<PathBuf, DrawerError> {
         match &self.key {
             EnvVar => {
@@ -225,6 +271,15 @@ impl DrawerOperation {
         Ok(())
     }
 
+    fn perform_key(&self) -> Result<(), DrawerError> {
+        let private_key = PrivateKey::random(&mut rand::rngs::OsRng, Algorithm::Ed25519)
+            .map_err(|_| DrawerError::KeyGenerateFailed)?;
+        let pem = private_key.to_openssh(LineEnding::LF)
+            .map_err(|_| DrawerError::KeyGenerateFailed)?;
+        std::fs::write(&self.drawer_file, pem.as_bytes())
+            .map_err(|_| DrawerError::KeyOutputFailed(self.drawer_file.clone()))
+    }
+
     fn validate_close(&self) -> Result<(), DrawerError> {
         let meta = std::fs::metadata(&self.target_path)
             .map_err(|_| DrawerError::TargetInvalid(self.target_path.clone()))?;