From 59b4339bd0c9b2e715be28797e8606e31196d9a8 Mon Sep 17 00:00:00 2001
From: jkaczman <jkaczman@pm.me>
Date: Tue, 23 Jun 2026 13:42:29 -0400
Subject: [PATCH 1/2] feat(tuf-updater): rough draft of OS update
 implementation

---
 update/{ => binary-updater}/Cargo.lock  |    0
 update/{ => binary-updater}/Cargo.toml  |    6 +-
 update/{ => binary-updater}/src/lib.rs  |    8 +-
 update/{ => binary-updater}/src/main.rs |   89 +-
 update/os-updater/Cargo.lock            | 2421 +++++++++++++++++++++++
 update/os-updater/Cargo.toml            |   13 +
 update/os-updater/src/bootloader.rs     |   96 +
 update/os-updater/src/main.rs           |  145 ++
 8 files changed, 2725 insertions(+), 53 deletions(-)
 rename update/{ => binary-updater}/Cargo.lock (100%)
 rename update/{ => binary-updater}/Cargo.toml (85%)
 rename update/{ => binary-updater}/src/lib.rs (99%)
 rename update/{ => binary-updater}/src/main.rs (91%)
 create mode 100644 update/os-updater/Cargo.lock
 create mode 100644 update/os-updater/Cargo.toml
 create mode 100644 update/os-updater/src/bootloader.rs
 create mode 100644 update/os-updater/src/main.rs

diff --git a/update/Cargo.lock b/update/binary-updater/Cargo.lock
similarity index 100%
rename from update/Cargo.lock
rename to update/binary-updater/Cargo.lock
diff --git a/update/Cargo.toml b/update/binary-updater/Cargo.toml
similarity index 85%
rename from update/Cargo.toml
rename to update/binary-updater/Cargo.toml
index 57437d1..76b57c2 100644
--- a/update/Cargo.toml
+++ b/update/binary-updater/Cargo.toml
@@ -1,8 +1,8 @@
 [package]
 name = "secluso-update"
 version = "1.0.2"
-edition = "2021"
-authors = ["Ardalan Amiri Sani <arrdalan@gmail.com>"]
+edition = "2024"
+authors = ["Ardalan Amiri Sani <arrdalan@proton.me>", "John Kaczman <jkaczman@pm.me>"]
 
 [dependencies]
 anyhow = "1"
@@ -21,4 +21,4 @@ sequoia-openpgp = { version = "2.2.0", default-features = false, features = ["co
 # zip + hashing
 zip = "8"
 sha2 = "0.10"
-hex = "0.4"
+hex = "0.4"
\ No newline at end of file
diff --git a/update/src/lib.rs b/update/binary-updater/src/lib.rs
similarity index 99%
rename from update/src/lib.rs
rename to update/binary-updater/src/lib.rs
index 7af60dd..8dbcd17 100644
--- a/update/src/lib.rs
+++ b/update/binary-updater/src/lib.rs
@@ -1,9 +1,9 @@
 //! SPDX-License-Identifier: GPL-3.0-or-later
 
-use anyhow::{anyhow, bail, Context, Result};
+use anyhow::{Context, Result, anyhow, bail};
 use bytes::Bytes;
 use reqwest::blocking::Client;
-use reqwest::header::{HeaderMap, HeaderValue, AUTHORIZATION};
+use reqwest::header::{AUTHORIZATION, HeaderMap, HeaderValue};
 use semver::Version;
 use serde::Deserialize;
 use sha2::{Digest, Sha256};
@@ -15,10 +15,10 @@ use std::time::{Duration, Instant};
 use zip::ZipArchive;
 
 use openpgp::cert::Cert;
+use openpgp::parse::Parse;
 use openpgp::parse::stream::{
     DetachedVerifierBuilder, GoodChecksum, MessageLayer, MessageStructure, VerificationHelper,
 };
-use openpgp::parse::Parse;
 use openpgp::policy::StandardPolicy;
 use openpgp::{Fingerprint, KeyHandle};
 use sequoia_openpgp as openpgp;
@@ -40,7 +40,7 @@ pub const NUM_USERNAME_CHARS: usize = 14;
 pub const NUM_PASSWORD_CHARS: usize = 14;
 
 /// A signer entry: label controls signature filename, github_user controls accepted keyring source.
-///Fingerprint (optionally in developer mode) pins trust to one exact OpenPGP primary key
+/// Fingerprint (optionally in developer mode) pins trust to one exact OpenPGP primary key
 #[derive(Clone, Debug, Eq, PartialEq)]
 pub struct Signer {
     pub label: String,
diff --git a/update/src/main.rs b/update/binary-updater/src/main.rs
similarity index 91%
rename from update/src/main.rs
rename to update/binary-updater/src/main.rs
index f6c71b8..07b73d1 100644
--- a/update/src/main.rs
+++ b/update/binary-updater/src/main.rs
@@ -13,12 +13,12 @@ use std::thread::sleep;
 use std::time::{Duration, Instant, SystemTime, UNIX_EPOCH};
 
 use secluso_update::{
-    build_github_client, default_signers, download_and_verify_component, fetch_latest_release,
-    get_current_version, github_token_from_env, parse_sig_keys, require_release_is_immutable,
-    write_current_version, Component, DEFAULT_OWNER_REPO,
+    Component, DEFAULT_OWNER_REPO, build_github_client, default_signers,
+    download_and_verify_component, fetch_latest_release, get_current_version,
+    github_token_from_env, parse_sig_keys, require_release_is_immutable, write_current_version,
 };
 
-const USAGE: &str = r#"
+const USAGE: &str = r"
 Secluso updater.
 
 Usage:
@@ -42,7 +42,7 @@ Options:
   --hint-check-interval-secs N  Update hint poll interval seconds [default: 10].
   --version, -v                 Show tool version.
   --help, -h                    Show this screen.
-"#;
+";
 
 #[derive(Debug, Deserialize)]
 struct Args {
@@ -125,14 +125,14 @@ fn main() -> ! {
     if args.flag_once {
         println!("Going to check for updates.");
         if let Err(e) = check_update(&args) {
-            eprintln!("Update check failed: {:#}", e);
+            eprintln!("Update check failed: {e:#}");
             std::process::exit(1);
         }
         std::process::exit(0);
     }
 
     if let Some(ref update_hint_path) = args.flag_update_hint_path {
-        if args.flag_interval_secs % args.flag_hint_check_interval_secs != 0 {
+        if !args.flag_interval_secs.is_multiple_of(args.flag_hint_check_interval_secs) {
             eprintln!(
                 "flag_interval_secs ({}) must be divisible by flag_update_hint_interval_secs ({})",
                 args.flag_interval_secs, args.flag_hint_check_interval_secs
@@ -141,14 +141,14 @@ fn main() -> ! {
         }
 
         // We want to force a check in the beginning.
-        let mut last_full_check = Instant::now() - Duration::from_secs(args.flag_interval_secs);
+        let mut last_full_check = Instant::now().checked_sub(Duration::from_secs(args.flag_interval_secs)).unwrap();
 
         loop {
             let elapsed = last_full_check.elapsed();
             if elapsed >= Duration::from_secs(args.flag_interval_secs) {
                 println!("Scheduled update check.");
                 if let Err(e) = check_update(&args) {
-                    eprintln!("Update check failed: {:#}", e);
+                    eprintln!("Update check failed: {e:#}");
                 }
                 last_full_check = Instant::now();
                 continue;
@@ -156,10 +156,10 @@ fn main() -> ! {
 
             sleep(Duration::from_secs(args.flag_hint_check_interval_secs));
 
-            if is_there_update_hint(&update_hint_path) {
+            if is_there_update_hint(update_hint_path) {
                 println!("Update hint received, triggering early check.");
                 if let Err(e) = check_update(&args) {
-                    eprintln!("Update check failed: {:#}", e);
+                    eprintln!("Update check failed: {e:#}");
                 }
                 last_full_check = Instant::now();
             }
@@ -168,13 +168,14 @@ fn main() -> ! {
         loop {
             println!("Going to check for updates.");
             if let Err(e) = check_update(&args) {
-                eprintln!("Update check failed: {:#}", e);
+                eprintln!("Update check failed: {e:#}");
             }
             sleep(Duration::from_secs(args.flag_interval_secs));
         }
     }
 }
 
+#[must_use]
 pub fn is_there_update_hint(path: &str) -> bool {
     let p = Path::new(path);
 
@@ -229,7 +230,7 @@ fn check_update(args: &Args) -> Result<()> {
         ReleaseSource::LatestImmutableGitHub => {
             println!("Using the latest immutable GitHub release.");
         }
-    };
+    }
 
     let release = selected_release.release;
 
@@ -264,7 +265,7 @@ fn check_update(args: &Args) -> Result<()> {
         prepare_verified_component_install(Path::new(&final_path), &verified.component_bytes)?;
 
     if let Some(unit) = args.flag_restart_unit.as_deref() {
-        println!("Stopping unit: {}", unit);
+        println!("Stopping unit: {unit}");
         run(&format!("systemctl stop {}", shell_escape(unit)));
     }
 
@@ -276,7 +277,7 @@ fn check_update(args: &Args) -> Result<()> {
     prepared_install.commit()?;
 
     if let Some(unit) = args.flag_restart_unit.as_deref() {
-        println!("Starting unit: {}", unit);
+        println!("Starting unit: {unit}");
         run(&format!("systemctl start {}", shell_escape(unit)));
     }
 
@@ -306,8 +307,7 @@ fn prepare_verified_component_install(
 
     let target_name = final_path
         .file_name()
-        .map(|name| name.to_string_lossy().into_owned())
-        .unwrap_or_else(|| "secluso-binary".to_string());
+        .map_or_else(|| "secluso-binary".to_string(), |name| name.to_string_lossy().into_owned());
 
     // Create the temp inode ourselves in the protected target directory with exclusive creation.
     // *Even if the filename is predictable, create_new refuses to adopt a preexisting file*
@@ -370,7 +370,7 @@ fn create_secure_install_temp_file(
             .open(&tmp_path)
         {
             Ok(file) => return Ok((tmp_path, file)),
-            Err(err) if err.kind() == std::io::ErrorKind::AlreadyExists => continue,
+            Err(err) if err.kind() == std::io::ErrorKind::AlreadyExists => {},
             Err(err) => {
                 return Err(err)
                     .with_context(|| format!("creating temp install path {}", tmp_path.display()));
@@ -385,7 +385,7 @@ fn create_secure_install_temp_file(
 }
 
 fn select_release_for_component<FLatest, FRequireImmutable>(
-    component: Component,
+    _component: Component,
     current_version: &Version,
     fetch_latest_release_fn: FLatest,
     require_release_is_immutable_fn: FRequireImmutable,
@@ -394,23 +394,19 @@ where
     FLatest: FnOnce() -> Result<secluso_update::GhRelease>,
     FRequireImmutable: FnOnce(&secluso_update::GhRelease) -> Result<()>,
 {
-    match component {
-        _ => {
-            let release = fetch_latest_release_fn()?;
-            require_release_is_immutable_fn(&release)?;
-
-            let latest_version = release.parsed_version()?;
-            if current_version >= &latest_version {
-                println!("Already on the latest immutable GitHub release.");
-                return Ok(None);
-            }
+    let release = fetch_latest_release_fn()?;
+    require_release_is_immutable_fn(&release)?;
 
-            Ok(Some(SelectedRelease {
-                release,
-                source: ReleaseSource::LatestImmutableGitHub,
-            }))
-        }
+    let latest_version = release.parsed_version()?;
+    if current_version >= &latest_version {
+        println!("Already on the latest immutable GitHub release.");
+        return Ok(None);
     }
+
+    Ok(Some(SelectedRelease {
+        release,
+        source: ReleaseSource::LatestImmutableGitHub,
+    }))
 }
 
 // "best-effort" command runner used for service stop/start so updater can still finish installation
@@ -423,6 +419,18 @@ fn run(cmd: &str) {
         .status();
 }
 
+
+// Minimal shell escaping helper to safely embed unit names into sh -c commands.
+fn shell_escape(s: &str) -> String {
+    if s.chars()
+        .all(|c| c.is_ascii_alphanumeric() || matches!(c, '.' | '-' | '_' | '@'))
+    {
+        s.to_string()
+    } else {
+        format!("'{}'", s.replace('\'', r"'\''"))
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
@@ -501,15 +509,4 @@ mod tests {
         assert!(!tmp_path.exists());
         assert!(!final_path.exists());
     }
-}
-
-// Minimal shell escaping helper to safely embed unit names into sh -c commands.
-fn shell_escape(s: &str) -> String {
-    if s.chars()
-        .all(|c| c.is_ascii_alphanumeric() || matches!(c, '.' | '-' | '_' | '@'))
-    {
-        s.to_string()
-    } else {
-        format!("'{}'", s.replace('\'', r#"'\''"#))
-    }
-}
+}
\ No newline at end of file
diff --git a/update/os-updater/Cargo.lock b/update/os-updater/Cargo.lock
new file mode 100644
index 0000000..90e0e16
--- /dev/null
+++ b/update/os-updater/Cargo.lock
@@ -0,0 +1,2421 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "aho-corasick"
+version = "1.1.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ddd31a130427c27518df266943a5308ed92d4b226cc639f5a8f1002816174301"
+dependencies = [
+ "memchr",
+]
+
+[[package]]
+name = "anyhow"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7f202df86484c868dbad7eaa557ef785d5c66295e41b460ef922eca0723b842c"
+
+[[package]]
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+dependencies = [
+ "event-listener",
+ "event-listener-strategy",
+ "futures-core",
+ "pin-project-lite",
+]
+
+[[package]]
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+ "syn",
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+ "libc",
+]
+
+[[package]]
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+dependencies = [
+ "windows_aarch64_gnullvm",
+ "windows_aarch64_msvc",
+ "windows_i686_gnu",
+ "windows_i686_gnullvm",
+ "windows_i686_msvc",
+ "windows_x86_64_gnu",
+ "windows_x86_64_gnullvm",
+ "windows_x86_64_msvc",
+]
+
+[[package]]
+name = "windows-threading"
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+dependencies = [
+ "windows-link",
+]
+
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+name = "windows_aarch64_gnullvm"
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+ "memchr",
+]
+
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+ "stable_deref_trait",
+ "yoke-derive",
+ "zerofrom",
+]
+
+[[package]]
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+]
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+ "async-io",
+ "async-lock",
+ "async-process",
+ "async-recursion",
+ "async-task",
+ "async-trait",
+ "blocking",
+ "enumflags2",
+ "event-listener",
+ "futures-core",
+ "futures-lite",
+ "hex",
+ "libc",
+ "ordered-stream",
+ "rustix",
+ "serde",
+ "serde_repr",
+ "tracing",
+ "uds_windows",
+ "uuid",
+ "windows-sys 0.61.2",
+ "winnow",
+ "zbus_macros",
+ "zbus_names",
+ "zvariant",
+]
+
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+name = "zbus_macros"
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+ "proc-macro-crate",
+ "proc-macro2",
+ "quote",
+ "syn",
+ "zbus_names",
+ "zvariant",
+ "zvariant_utils",
+]
+
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+name = "zbus_names"
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+ "zerofrom-derive",
+]
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+ "quote",
+ "syn",
+ "synstructure",
+]
+
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+ "yoke",
+ "zerofrom",
+]
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+ "yoke",
+ "zerofrom",
+ "zerovec-derive",
+]
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+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
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+dependencies = [
+ "endi",
+ "enumflags2",
+ "serde",
+ "winnow",
+ "zvariant_derive",
+ "zvariant_utils",
+]
+
+[[package]]
+name = "zvariant_derive"
+version = "5.12.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "90bc6cde9c01c511074be97f7ccb6c19d0da89e3f8662e812e999dcfd4638737"
+dependencies = [
+ "proc-macro-crate",
+ "proc-macro2",
+ "quote",
+ "syn",
+ "zvariant_utils",
+]
+
+[[package]]
+name = "zvariant_utils"
+version = "3.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e8535915cfa75547e559d8c68e8139909a4aeee076831e4ef7fc59d8172c4d6"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "serde",
+ "syn",
+ "winnow",
+]
diff --git a/update/os-updater/Cargo.toml b/update/os-updater/Cargo.toml
new file mode 100644
index 0000000..a032d33
--- /dev/null
+++ b/update/os-updater/Cargo.toml
@@ -0,0 +1,13 @@
+[package]
+name = "tuf-updater"
+version = "0.1.0"
+edition = "2024"
+authors = ["John Kaczman <jkaczman@pm.me>"]
+
+[dependencies]
+tough = { version = "0.23.0", features = ["http"] }
+url = "2.5.8"
+tokio = { version = "1.0.0", features = ["rt", "rt-multi-thread", "macros"] }
+anyhow = "1.0.102"
+semver = "1"
+system_shutdown = "4.1.0"
\ No newline at end of file
diff --git a/update/os-updater/src/bootloader.rs b/update/os-updater/src/bootloader.rs
new file mode 100644
index 0000000..7346982
--- /dev/null
+++ b/update/os-updater/src/bootloader.rs
@@ -0,0 +1,96 @@
+//! SPDX-License-Identifier: GPL-3.0-or-later
+
+/// We use the bootloader backend to maintain the A/B slots.
+/// This is the backend for  Raspberry Pi: <https://github.com/Rtone/raspberrypi-firmware-rauc-bootloader-backend/blob/c8aa8ab78f9eb12c42d5b45f7d27c430bce8b7ef/bootloader-custom-backend>
+/// It uses the tryboot Raspberry Pi feature to ensure atomic fail-safe OS updates <https://www.raspberrypi.com/documentation/computers/raspberry-pi.html#fail-safe-os-updates-tryboot>
+/// Based on the <https://rauc.readthedocs.io/en/latest/integration.html#custom-bootloader-backend-interface> format
+use anyhow::{Context, anyhow};
+use std::process::Command;
+
+// Location for the backend as described in the header comment.
+const BOOTLOADER_BACKEND: &str = "/usr/sbin/bootloader-backend";
+
+/**
+    In addition to the primary slot, RAUC must also be able to determine the boot state of a specific slot.
+    RAUC determines the necessary boot state by calling the custom bootloader handler with the argument get-state <slot.bootname>.
+    Whereupon the handler has to output the state good or bad to stdout and exit with the return value 0.
+    If the state cannot be determined or another error occurs, the custom bootloader handler must exit with non-zero return value.
+*/
+#[allow(dead_code)]
+fn get_state() -> anyhow::Result<String> {
+    run_command("get-state", vec![])
+}
+
+/**
+    To set the boot state to the desire slot, the handler is called with argument set-state <slot.bootname> <state>.
+    As already mentioned in the paragraph above, the <slot.bootname> matches the bootname= key defined for the respective slot in your system.conf.
+    The <state> argument corresponds to one of the following values:
+
+    good if the last start of the slot was successful or
+    bad if the last start of the slot failed.
+
+    The return value must be 0 if the boot state was set successfully, or non-zero if an error occurred.
+*/
+#[allow(dead_code)]
+fn set_state(state: &str) -> anyhow::Result<()> {
+    let _ = run_command("set-primary", vec![state])?;
+    Ok(())
+}
+
+/**
+    To get the primary slot, the handler is called with the argument get-primary.
+    The handler must output the current primary slot’s bootname on the stdout, and return 0 on exit, if no error occurred.
+    In case of failure, the handler must return with non-zero value.
+*/
+pub(crate) fn get_primary() -> anyhow::Result<i32> {
+    let stdout = run_command("get-primary", vec![])?;
+
+    stdout
+        .parse()
+        .context("Failed to parse String into Integer")
+}
+
+/**
+    Accordingly, in order to set the primary slot, the custom bootloader handler is called with argument set-primary <slot.bootname>
+    where <slot.bootname> matches the bootname= key defined for the respective slot in your system.conf.
+    If the set was successful, the handler must also return with a 0, otherwise the return value must be non-zero.
+*/
+pub(crate) fn set_primary(slot_bootname: &str) -> anyhow::Result<()> {
+    let _ = run_command("set-primary", vec![slot_bootname])?;
+    Ok(())
+}
+
+/**
+    To get the current running slot, the handler must be called with the argument get-current.
+    The handler must output the current running slot’s bootname on the stdout, and return 0 on exit, if no error occurred.
+    Implementing this is only needed when the /proc/cmdline is not providing information about current booted slot.
+*/
+#[allow(dead_code)]
+pub(crate) fn get_current() -> anyhow::Result<i32> {
+    let stdout = run_command("get-current", vec![])?;
+
+    stdout
+        .parse()
+        .context("Failed to parse String into Integer")
+}
+
+/// Utility function to run a command and follow the standard protocol.
+/// Is success? Return stdout.
+/// Is error? Return error.
+fn run_command(command: &str, additional_args: Vec<&str>) -> anyhow::Result<String> {
+    let output = Command::new("sh")
+        .arg("-c")
+        .arg(BOOTLOADER_BACKEND)
+        .arg(command)
+        .args(additional_args)
+        .output()?;
+    let stdout = String::from_utf8(output.stdout)?;
+    let stderr = String::from_utf8(output.stderr)?;
+    let status = output.status;
+
+    if status.success() {
+        Ok(stdout)
+    } else {
+        Err(anyhow!(stderr))
+    }
+}
diff --git a/update/os-updater/src/main.rs b/update/os-updater/src/main.rs
new file mode 100644
index 0000000..328f54f
--- /dev/null
+++ b/update/os-updater/src/main.rs
@@ -0,0 +1,145 @@
+//! SPDX-License-Identifier: GPL-3.0-or-later
+
+/// An updater client that uses TUF <https://theupdateframework.io> via AWS Labs implementation, tough <https://github.com/awslabs/tough>
+/// Tough follows the TUF 1.0.0 specification <https://github.com/theupdateframework/specification/blob/9f148556ca15da2ec5c022c8b3e6f99a028e5fe5/tuf-spec.md>
+/// Why this custom TUF updater over RAUC/Mender/SWUpdate? It allows support for quorums.
+/// That means it enforces that M of N people have to sign for a target/metadata to be valid.
+/// This prevents compromise of a singular key/person from attacking users.
+///
+/// Meant to be ran under a systemd timer service; simplifies the implementation.
+///
+/// TODO: We should get people from different jurisdictions to participate.
+///       (they can check code that changed since last release + reproducible builds)
+mod bootloader;
+
+use anyhow::Context;
+use semver::Version;
+use std::fs::{File, read};
+use std::io::Write;
+use system_shutdown::force_reboot;
+use tough::{IntoVec, Repository, RepositoryLoader, TargetName};
+use url::Url;
+
+// For now, we store the targets and metadata in Cloudflare R2 object storage.
+// TODO: Support backup mirrors for both the repo and targets.
+//       Postponed for now as tough doesn't come with a mirror role built in.
+//       TUF 1.0.0 spec talks about it though.
+const REPO_ROOT: &str = "https://mirror.secluso.net/tuf-repo";
+
+// "root is the content of a TRUSTED root metadata file, which you must ship with your software using an out-of-band process."
+// Given through an out-of-band process initially (initial .wic), and then updated when new .squashfs is downloaded.
+// Therefore, it is NOT stored in a mutable place such as /data.
+// This tells TUF the trusted keys (and is signed by such keys) and specifies trusted keys for other top-level roles.
+// It also specifies thresholds for quorums for each role [root, snapshot, targets, timestamp]
+const ROOT_FILE: &str = "/home/pi/root.json";
+
+// tough requires async
+#[tokio::main]
+async fn main() -> Result<(), anyhow::Error> {
+    // Establish trust with the out-of-band root.
+    let root_file_contents =
+        read(ROOT_FILE).context("The root file is not in the expected place")?;
+
+    // metadata_base_url and targets_base_url are the base URLs where the client can find metadata (such as root.json) and targets (as listed in targets.json).
+    let metadata_base_url = Url::parse(&format!("{REPO_ROOT}/metadata"))?;
+    let targets_base_url = Url::parse(&format!("{REPO_ROOT}/targets"))?;
+
+    // https://docs.rs/tough/latest/tough/struct.RepositoryLoader.html
+    let repository =
+        RepositoryLoader::new(&root_file_contents, metadata_base_url, targets_base_url)
+            .load()
+            .await?;
+
+    // We use the current crate version to indicate what version we're on (and tell if we're outdated)
+    let current_version = Version::parse(env!("CARGO_PKG_VERSION"))?;
+
+    // Find a valid target in the repo that meets the newer version and squashfs requirements.
+    let valid_target = get_valid_target(&repository, &current_version);
+
+    // TODO: If we're consistently <denied> updates for whatever reason, we should alert the user via the camera_hub (and perhaps by blinking the LED).
+    //       An attacker may try to hold them on an older version.
+
+    // If we find a viable target, then we fetch through TUF, overwrite the slot and call the bootloader backend.
+    if let Some(target) = valid_target {
+        perform_update(&repository, &target).await?;
+    } else {
+        println!("No new update found");
+    }
+
+    Ok(())
+}
+
+/// Fetch the bytes of the `target` from the `repository`, overwrite the other slot,
+/// set the other slot as primary through the bootloader, and then reboot.
+async fn perform_update(repository: &Repository, target: &TargetName) -> anyhow::Result<()> {
+    let target_bytes = fetch_target_bytes(repository, target).await?;
+
+    let opposite_slot = match bootloader::get_primary()? {
+        0 => "/slot-b",
+        1 => "/slot-a",
+        other => panic!("unexpected slot {other}"),
+    };
+
+    let mut opposite_slot_block_device =
+        File::open(opposite_slot).context("The slot partition does not exist")?;
+
+    // Write the downloaded squashfs partition bytes into the other slot.
+    opposite_slot_block_device
+        .write_all(&target_bytes)
+        .context("Failed to overwrite the other slot")?;
+
+    bootloader::set_primary(opposite_slot)?;
+
+    // Reboot into the new slot.
+    force_reboot()?;
+
+    // TODO: Check on the camera hub service and flip if necessary after reboot.
+    Ok(())
+}
+
+/// Fetch and verify the requested `target` bytes from the `repository` into a Vec.
+async fn fetch_target_bytes(
+    repository: &Repository,
+    target: &TargetName,
+) -> anyhow::Result<Vec<u8>> {
+    // Fetch a target's bytes into the heap.
+    // TUF will validate hashes, signatures, etc. before giving us access to the data.
+    // Alternatively, we could save to a file, e.g.: repository.save_target(target.0, "/data", Prefix::None).await?;
+    // However, our only option would be /data. That would be putting it in a mutable vulnerable state.
+    let valid_request = repository
+        .read_target(target)
+        .await
+        .context("The repository metadata is expired or there was an issue making the request")?;
+    let data_stream =
+        valid_request.context("The requested target is not listed in the repository metadata")?;
+
+    // "Consumers of this library must not use data from the stream if it returns an error."
+    // into_vec consumes the entire stream (and will propagate errors)
+    data_stream
+        .into_vec()
+        .await
+        .context("The checksum of the requested target did not match")
+}
+
+/// Check the `repository`: is there a target that has a higher version than `current_version`?
+fn get_valid_target(repository: &Repository, current_version: &Version) -> Option<TargetName> {
+    // https://docs.rs/tough/latest/tough/struct.Repository.html
+    for target in repository.all_targets() {
+        // Check the custom metadata field within the target.
+        // What version does it have? Is it higher than the current version?
+
+        if let Some(value) = target.1.custom.get("version")
+            && let Some(version) = value.as_str()
+            && let Ok(parsed_version) = Version::parse(version)
+            && *current_version < parsed_version
+        {
+            // TODO: Check: is the hash for the target we want in EAS?
+            //       This will make updates immutable in the blockchain.
+            //       https://github.com/secluso/core/issues/124
+
+            return Some(target.0.to_owned());
+        }
+    }
+
+    None
+}

From 53158a207aba42698a97e9e100237fc14c3d6ead Mon Sep 17 00:00:00 2001
From: jkaczman <jkaczman@pm.me>
Date: Tue, 23 Jun 2026 13:55:47 -0400
Subject: [PATCH 2/2] fix(tuf-updater): read ROOT_FILE from current slot

---
 update/os-updater/src/main.rs | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/update/os-updater/src/main.rs b/update/os-updater/src/main.rs
index 328f54f..a09a6f2 100644
--- a/update/os-updater/src/main.rs
+++ b/update/os-updater/src/main.rs
@@ -31,14 +31,20 @@ const REPO_ROOT: &str = "https://mirror.secluso.net/tuf-repo";
 // Therefore, it is NOT stored in a mutable place such as /data.
 // This tells TUF the trusted keys (and is signed by such keys) and specifies trusted keys for other top-level roles.
 // It also specifies thresholds for quorums for each role [root, snapshot, targets, timestamp]
-const ROOT_FILE: &str = "/home/pi/root.json";
+const ROOT_FILE: &str = "root.json";
 
 // tough requires async
 #[tokio::main]
 async fn main() -> Result<(), anyhow::Error> {
+    let current_slot = match bootloader::get_current()? {
+        0 => "/slot-a",
+        1 => "/slot-b",
+        other => panic!("unexpected slot {other}"),
+    };
+
     // Establish trust with the out-of-band root.
-    let root_file_contents =
-        read(ROOT_FILE).context("The root file is not in the expected place")?;
+    let root_file_contents = read(format!("{current_slot}/{ROOT_FILE}"))
+        .context("The root file is not in the expected place")?;
 
     // metadata_base_url and targets_base_url are the base URLs where the client can find metadata (such as root.json) and targets (as listed in targets.json).
     let metadata_base_url = Url::parse(&format!("{REPO_ROOT}/metadata"))?;