Merge pull request #31 from DeterminateSystems/nix-mac-encrypted-volume

Nix Mac encrypted volume support

Cargo.lock

@@ -786,6 +786,7 @@ dependencies = [
  "nix",
  "owo-colors",
  "plist",
+ "rand 0.8.5",
  "reqwest",
  "serde",
  "serde_json",
@@ -1333,6 +1334,12 @@ dependencies = [
  "winapi",
 ]
 
+[[package]]
+name = "ppv-lite86"
+version = "0.2.16"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "eb9f9e6e233e5c4a35559a617bf40a4ec447db2e84c20b55a6f83167b7e57872"
+
 [[package]]
 name = "proc-macro-error"
 version = "1.0.4"
@@ -1394,6 +1401,27 @@ dependencies = [
  "winapi",
 ]
 
+[[package]]
+name = "rand"
+version = "0.8.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "34af8d1a0e25924bc5b7c43c079c942339d8f0a8b57c39049bef581b46327404"
+dependencies = [
+ "libc",
+ "rand_chacha",
+ "rand_core 0.6.4",
+]
+
+[[package]]
+name = "rand_chacha"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
+dependencies = [
+ "ppv-lite86",
+ "rand_core 0.6.4",
+]
+
 [[package]]
 name = "rand_core"
 version = "0.3.1"
@@ -1409,6 +1437,15 @@ version = "0.4.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9c33a3c44ca05fa6f1807d8e6743f3824e8509beca625669633be0acbdf509dc"
 
+[[package]]
+name = "rand_core"
+version = "0.6.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ec0be4795e2f6a28069bec0b5ff3e2ac9bafc99e6a9a7dc3547996c5c816922c"
+dependencies = [
+ "getrandom",
+]
+
 [[package]]
 name = "rdrand"
 version = "0.4.0"
@@ -1808,7 +1845,7 @@ version = "0.3.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "15f2b5fb00ccdf689e0149d1b1b3c03fead81c2b37735d812fa8bddbbf41b6d8"
 dependencies = [
- "rand",
+ "rand 0.4.6",
  "remove_dir_all",
 ]
 

Cargo.toml

@@ -48,3 +48,4 @@ dirs = "4.0.0"
 erased-serde = "0.3.23"
 typetag = "0.2.3"
 dyn-clone = "1.0.9"
+rand = "0.8.5"

README.md

@@ -13,10 +13,11 @@ Planned support:
 * [x] Multi-user x86_64 Linux with systemd init
 * [ ] Multi-user aarch64 Linux with systemd init
 * [x] Multi-user x86_64 MacOS
-    + Note: Uninstall and encrypted volume support are incomplete
+    + Note: User deletion is currently unimplemented, you need to use a user with a secure token and `dscl . -delete /Users/_nixbuild*` where `*` is each user number.
+* [x] Multi-user aarch64 MacOS
+    + Note: User deletion is currently unimplemented, you need to use a user with a secure token and `dscl . -delete /Users/_nixbuild*` where `*` is each user number.
 * [ ] Single-user x86_64 Linux with systemd init
 * [ ] Single-user aarch64 Linux with systemd init
-* [ ] Multi-user aarch64 MacOS
 * [ ] Others...
 
 ## Installation Differences

src/action/base/create_group.rs

@@ -70,6 +70,14 @@ impl Action for CreateGroup {
                 patch: _,
             }
             | OperatingSystem::Darwin => {
+                if Command::new("/usr/bin/dscl")
+                    .args([".", "-read", &format!("/Groups/{name}")])
+                    .status()
+                    .await?
+                    .success()
+                {
+                    ()
+                } else {
                     execute_command(Command::new("/usr/sbin/dseditgroup").args([
                         "-o",
                         "create",
@@ -81,6 +89,7 @@ impl Action for CreateGroup {
                     ]))
                     .await
                     .map_err(|e| CreateGroupError::Command(e).boxed())?;
+                }
             },
             _ => {
                 execute_command(Command::new("groupadd").args([
@@ -141,13 +150,16 @@ impl Action for CreateGroup {
                 patch: _,
             }
             | OperatingSystem::Darwin => {
-                execute_command(Command::new("/usr/bin/dscl").args([
+                // TODO(@hoverbear): Make this actually work...
-                    ".",
+                // Right now, our test machines do not have a secure token and cannot delete users.
-                    "-delete",
+                tracing::warn!("Harmonic currently cannot delete groups on Mac due to https://github.com/DeterminateSystems/harmonic/issues/33. This is a no-op, installing with harmonic again will use the existing group.");
-                    &format!("/Groups/{name}"),
+                // execute_command(Command::new("/usr/bin/dscl").args([
-                ]))
+                //     ".",
-                .await
+                //     "-delete",
-                .map_err(|e| CreateGroupError::Command(e).boxed())?;
+                //     &format!("/Groups/{name}"),
+                // ]))
+                // .await
+                // .map_err(|e| CreateGroupError::Command(e).boxed())?;
             },
             _ => {
                 execute_command(Command::new("groupdel").arg(&name))

src/action/base/create_user.rs

@@ -81,6 +81,17 @@ impl Action for CreateUser {
                 patch: _,
             }
             | OperatingSystem::Darwin => {
+                // TODO(@hoverbear): Make this actually work...
+                // Right now, our test machines do not have a secure token and cannot delete users.
+
+                if Command::new("/usr/bin/dscl")
+                    .args([".", "-read", &format!("/Users/{name}")])
+                    .status()
+                    .await?
+                    .success()
+                {
+                    ()
+                } else {
                     execute_command(Command::new("/usr/bin/dscl").args([
                         ".",
                         "-create",
@@ -156,6 +167,7 @@ impl Action for CreateUser {
                     )
                     .await
                     .map_err(|e| CreateUserError::Command(e).boxed())?;
+                }
             },
             _ => {
                 execute_command(Command::new("useradd").args([
@@ -235,13 +247,16 @@ impl Action for CreateUser {
                 patch: _,
             }
             | OperatingSystem::Darwin => {
-                execute_command(Command::new("/usr/bin/dscl").args([
+                // TODO(@hoverbear): Make this actually work...
-                    ".",
+                // Right now, our test machines do not have a secure token and cannot delete users.
-                    "-delete",
+                tracing::warn!("Harmonic currently cannot delete groups on Mac due to https://github.com/DeterminateSystems/harmonic/issues/33. This is a no-op, installing with harmonic again will use the existing user.");
-                    &format!("/Users/{name}"),
+                // execute_command(Command::new("/usr/bin/dscl").args([
-                ]))
+                //     ".",
-                .await
+                //     "-delete",
-                .map_err(|e| CreateUserError::Command(e).boxed())?;
+                //     &format!("/Users/{name}"),
+                // ]))
+                // .await
+                // .map_err(|e| CreateUserError::Command(e).boxed())?;
             },
             _ => {
                 execute_command(Command::new("userdel").args([&name.to_string()]))

src/action/darwin/create_apfs_volume.rs

@@ -17,14 +17,14 @@ use std::{
 };
 use tokio::process::Command;
 
-const NIX_VOLUME_MOUNTD_DEST: &str = "/Library/LaunchDaemons/org.nixos.darwin-store.plist";
+pub const NIX_VOLUME_MOUNTD_DEST: &str = "/Library/LaunchDaemons/org.nixos.darwin-store.plist";
 
 #[derive(Debug, serde::Deserialize, serde::Serialize, Clone)]
 pub struct CreateApfsVolume {
     disk: PathBuf,
     name: String,
     case_sensitive: bool,
-    encrypt: Option<String>,
+    encrypt: bool,
     create_or_append_synthetic_conf: CreateOrAppendFile,
     create_synthetic_objects: CreateSyntheticObjects,
     unmount_volume: UnmountVolume,
@@ -43,7 +43,7 @@ impl CreateApfsVolume {
         disk: impl AsRef<Path>,
         name: String,
         case_sensitive: bool,
-        encrypt: Option<String>,
+        encrypt: bool,
     ) -> Result<Self, Box<dyn std::error::Error + Send + Sync>> {
         let disk = disk.as_ref();
         let create_or_append_synthetic_conf = CreateOrAppendFile::plan(
@@ -72,31 +72,25 @@ impl CreateApfsVolume {
         .await
         .map_err(|e| e.boxed())?;
 
-        let encrypt_volume = if let Some(password) = encrypt.as_ref() {
+        let encrypt_volume = if encrypt {
-            Some(EncryptVolume::plan(disk, password.to_string()).await?)
+            Some(EncryptVolume::plan(disk, &name).await?)
         } else {
             None
         };
 
-        let mount_command = if encrypt.is_some() {
+        let name_with_qoutes = format!("\"{name}\"");
-            vec![
+        let encrypted_command;
-                "/bin/sh",
+        let mount_command = if encrypt {
-                "-c",
+            encrypted_command = format!("/usr/bin/security find-generic-password -s {name_with_qoutes} -w |  /usr/sbin/diskutil apfs unlockVolume {name_with_qoutes} -mountpoint /nix -stdinpassphrase");
-                "/usr/bin/security find-generic-password",
+            vec!["/bin/sh", "-c", encrypted_command.as_str()]
-                "-s",
-                "{name}",
-                "-w",
-                "|",
-                "/usr/sbin/diskutil",
-                "apfs",
-                "unlockVolume",
-                &name,
-                "-mountpoint",
-                "/nix",
-                "-stdinpassphrase",
-            ]
         } else {
-            vec!["/usr/sbin/diskutil", "mount", "-mountPoint", "/nix", &name]
+            vec![
+                "/usr/sbin/diskutil",
+                "mount",
+                "-mountPoint",
+                "/nix",
+                name.as_str(),
+            ]
         };
         // TODO(@hoverbear): Use plist lib we have in tree...
         let mount_plist = format!(

src/action/darwin/enable_ownership.rs

@@ -60,8 +60,7 @@ impl Action for EnableOwnership {
                     .args(["info", "-plist"])
                     .arg(&path),
             )
-            .await
+            .await?
-            .unwrap()
             .stdout;
             let the_plist: DiskUtilOutput = plist::from_reader(Cursor::new(buf)).unwrap();
 

src/action/darwin/encrypt_volume.rs

@@ -1,11 +1,15 @@
+use crate::{
+    action::{darwin::NIX_VOLUME_MOUNTD_DEST, Action, ActionDescription, ActionState},
+    execute_command,
+};
+use rand::Rng;
 use std::path::{Path, PathBuf};
-
+use tokio::process::Command;
-use crate::action::{Action, ActionDescription, ActionState};
 
 #[derive(Debug, serde::Deserialize, serde::Serialize, Clone)]
 pub struct EncryptVolume {
     disk: PathBuf,
-    password: String,
+    name: String,
     action_state: ActionState,
 }
 
@@ -13,11 +17,12 @@ impl EncryptVolume {
     #[tracing::instrument(skip_all)]
     pub async fn plan(
         disk: impl AsRef<Path>,
-        password: String,
+        name: impl AsRef<str>,
     ) -> Result<Self, Box<dyn std::error::Error + Send + Sync>> {
+        let name = name.as_ref().to_owned();
         Ok(Self {
+            name,
             disk: disk.as_ref().to_path_buf(),
-            password,
             action_state: ActionState::Uncompleted,
         })
     }
@@ -42,8 +47,8 @@ impl Action for EncryptVolume {
     ))]
     async fn execute(&mut self) -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
         let Self {
-            disk: _,
+            disk,
-            password: _,
+            name,
             action_state,
         } = self;
         if *action_state == ActionState::Completed {
@@ -52,7 +57,75 @@ impl Action for EncryptVolume {
         }
         tracing::debug!("Encrypting volume");
 
-        todo!();
+        // Generate a random password.
+        let password: String = {
+            const CHARSET: &[u8] = b"ABCDEFGHIJKLMNOPQRSTUVWXYZ\
+                                abcdefghijklmnopqrstuvwxyz\
+                                    0123456789)(*&^%$#@!~";
+            const PASSWORD_LEN: usize = 32;
+            let mut rng = rand::thread_rng();
+
+            (0..PASSWORD_LEN)
+                .map(|_| {
+                    let idx = rng.gen_range(0..CHARSET.len());
+                    CHARSET[idx] as char
+                })
+                .collect()
+        };
+
+        let disk_str = disk.to_str().expect("Could not turn disk into string"); /* Should not reasonably ever fail */
+
+        execute_command(Command::new("/usr/sbin/diskutil").arg("mount").arg(&name)).await?;
+
+        // Add the password to the user keychain so they can unlock it later.
+        execute_command(
+            Command::new("/usr/bin/security").args([
+                "add-generic-password",
+                "-a",
+                name.as_str(),
+                "-s",
+                name.as_str(),
+                "-l",
+                format!("{} encryption password", disk_str).as_str(),
+                "-D",
+                "Encrypted volume password",
+                "-j",
+                format!(
+                    "Added automatically by the Nix installer for use by {NIX_VOLUME_MOUNTD_DEST}"
+                )
+                .as_str(),
+                "-w",
+                password.as_str(),
+                "-T",
+                "/System/Library/CoreServices/APFSUserAgent",
+                "-T",
+                "/System/Library/CoreServices/CSUserAgent",
+                "-T",
+                "/usr/bin/security",
+                "/Library/Keychains/System.keychain",
+            ]),
+        )
+        .await?;
+
+        // Encrypt the mounted volume
+        execute_command(Command::new("/usr/sbin/diskutil").args([
+            "apfs",
+            "encryptVolume",
+            name.as_str(),
+            "-user",
+            "disk",
+            "-passphrase",
+            password.as_str(),
+        ]))
+        .await?;
+
+        execute_command(
+            Command::new("/usr/sbin/diskutil")
+                .arg("unmount")
+                .arg("force")
+                .arg(&name),
+        )
+        .await?;
 
         tracing::trace!("Encrypted volume");
         *action_state = ActionState::Completed;
@@ -72,17 +145,40 @@ impl Action for EncryptVolume {
     ))]
     async fn revert(&mut self) -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
         let Self {
-            disk: _,
+            disk,
-            password: _,
+            name,
             action_state,
         } = self;
         if *action_state == ActionState::Uncompleted {
-            tracing::trace!("Already reverted: Unencrypted volume (noop)");
+            tracing::trace!("Already reverted: Unencrypted volume");
             return Ok(());
         }
-        tracing::debug!("Unencrypted volume (noop)");
+        tracing::debug!("Unencrypted volume");
 
-        tracing::trace!("Unencrypted volume (noop)");
+        let disk_str = disk.to_str().expect("Could not turn disk into string"); /* Should not reasonably ever fail */
+
+        // TODO: This seems very rough and unsafe
+        execute_command(
+            Command::new("/usr/bin/security").args([
+                "delete-generic-password",
+                "-a",
+                name.as_str(),
+                "-s",
+                name.as_str(),
+                "-l",
+                format!("{} encryption password", disk_str).as_str(),
+                "-D",
+                "Encrypted volume password",
+                "-j",
+                format!(
+                    "Added automatically by the Nix installer for use by {NIX_VOLUME_MOUNTD_DEST}"
+                )
+                .as_str(),
+            ]),
+        )
+        .await?;
+
+        tracing::trace!("Unencrypted volume");
         *action_state = ActionState::Completed;
         Ok(())
     }

src/action/darwin/mod.rs

@@ -8,7 +8,7 @@ mod kickstart_launchctl_service;
 mod unmount_volume;
 
 pub use bootstrap_volume::{BootstrapVolume, BootstrapVolumeError};
-pub use create_apfs_volume::{CreateApfsVolume, CreateApfsVolumeError};
+pub use create_apfs_volume::{CreateApfsVolume, CreateApfsVolumeError, NIX_VOLUME_MOUNTD_DEST};
 pub use create_synthetic_objects::{CreateSyntheticObjects, CreateSyntheticObjectsError};
 pub use create_volume::{CreateVolume, CreateVolumeError};
 pub use enable_ownership::{EnableOwnership, EnableOwnershipError};

src/planner/darwin/multi.rs

@@ -18,13 +18,22 @@ use crate::{
 pub struct DarwinMulti {
     #[clap(flatten)]
     pub settings: CommonSettings,
+    /// Force encryption on the volume
+    #[clap(
+        long,
+        action(ArgAction::Set),
+        default_value = "false",
+        env = "HARMONIC_ENCRYPT"
+    )]
+    pub encrypt: Option<bool>,
+    /// Use a case sensitive volume
     #[clap(
         long,
         action(ArgAction::SetTrue),
         default_value = "false",
-        env = "HARMONIC_VOLUME_ENCRYPT"
+        env = "HARMONIC_CASE_SENSITIVE"
     )]
-    pub volume_encrypt: bool,
+    pub case_sensitive: bool,
     #[clap(long, default_value = "Nix Store", env = "HARMONIC_VOLUME_LABEL")]
     pub volume_label: String,
     #[clap(long, env = "HARMONIC_ROOT_DISK")]
@@ -48,7 +57,8 @@ impl Planner for DarwinMulti {
         Ok(Self {
             settings: CommonSettings::default()?,
             root_disk: Some(default_root_disk().await?),
-            volume_encrypt: false,
+            case_sensitive: false,
+            encrypt: None,
             volume_label: "Nix Store".into(),
         })
     }
@@ -71,7 +81,17 @@ impl Planner for DarwinMulti {
             },
         };
 
-        let volume_label = "Nix Store".into();
+        let encrypt = if self.encrypt == None {
+            Command::new("/usr/bin/fdesetup")
+                .arg("isactive")
+                .status()
+                .await?
+                .code()
+                .map(|v| if v == 0 { false } else { true })
+                .unwrap_or(false)
+        } else {
+            false
+        };
 
         Ok(InstallPlan {
             planner: Box::new(self.clone()),
@@ -83,9 +103,9 @@ impl Planner for DarwinMulti {
                 Box::new(
                     CreateApfsVolume::plan(
                         self.root_disk.unwrap(), /* We just ensured it was populated */
-                        volume_label,
+                        self.volume_label,
                         false,
-                        None,
+                        encrypt,
                     )
                     .await?,
                 ),
@@ -103,19 +123,21 @@ impl Planner for DarwinMulti {
     ) -> Result<HashMap<String, serde_json::Value>, Box<dyn std::error::Error + Sync + Send>> {
         let Self {
             settings,
-            volume_encrypt,
+            encrypt,
             volume_label,
+            case_sensitive,
             root_disk,
         } = self;
         let mut map = HashMap::default();
 
         map.extend(settings.describe()?.into_iter());
-        map.insert(
+        map.insert("volume_encrypt".into(), serde_json::to_value(encrypt)?);
-            "volume_encrypt".into(),
-            serde_json::to_value(volume_encrypt)?,
-        );
         map.insert("volume_label".into(), serde_json::to_value(volume_label)?);
         map.insert("root_disk".into(), serde_json::to_value(root_disk)?);
+        map.insert(
+            "case_sensitive".into(),
+            serde_json::to_value(case_sensitive)?,
+        );
 
         Ok(map)
     }