fix(engine): undo and redo purge stale grants; explicit-text paste is not a clipboard read

Adds step-security/harden-runner (audit, pinned to v2.22.4 like
craft-common-actions) as the first step of each job that did not have it,
so every workflow in the org's public repos reports its egress to
StepSecurity. Audit, not block: block-mode allow lists come from each
job's observed traffic.

.github/workflows/packaging-lint.yml

@@ -27,6 +27,10 @@ jobs:
     name: Windows installation policy (no app build)
     runs-on: windows-latest
     steps:
+      - name: Harden runner
+        uses: step-security/harden-runner@1d88384fd173af6ecb012dfd0264a306b711241a # v2.22.4
+        with:
+          egress-policy: audit
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           persist-credentials: false

crates/engine/src/cmd.rs

@@ -467,11 +467,19 @@ pub(crate) fn commit<R>(d: &mut DocState, f: impl FnOnce(&mut Ctx) -> Result<R>)
     if let Some(t0) = t0 {
         eprintln!("commit: + rows {:?}", since(t0));
     }
+    // A grant to edit a protected range belongs to the sheet and range it was given for: a sheet that
+    // was renamed, deleted or replaced by another of the same name no longer carries it.
+    purge_unlock_grants(&mut d.unlocked_ranges, &wb);
     d.wb = std::sync::Arc::new(wb);
     d.selection = sel;
     Ok(r)
 }
 
+/// Drops the grants to edit protected ranges whose sheet name or range title `wb` no longer has.
+pub(crate) fn purge_unlock_grants(grants: &mut Vec<(String, String)>, wb: &Workbook) {
+    grants.retain(|(sheet, title)| wb.sheets.iter().any(|sh| sh.name == *sheet && sh.edit_ranges.iter().any(|r| r.title == *title)));
+}
+
 /// "Set precision as displayed": a number typed, pasted or reformatted is stored as its format
 /// shows it (Excel rounds a constant when it is entered and when its cell's format changes,
 /// observed through COM). Only cells the edit touched are visited, so this costs nothing for

crates/engine/src/cmd/edit.rs

@@ -209,6 +209,7 @@ fn undo(s: &mut Session, p: &Json) -> Result<Json> {
         crate::push_history(&mut d.redo, label.clone(), cur_wb, &d.wb, cur_selection);
     }
     super::extra::keep_watch_list(&now, &mut d.wb);
+    crate::cmd::purge_unlock_grants(&mut d.unlocked_ranges, &d.wb);
     d.calc.rebuild(&d.wb);
     d.revision += 1;
     Ok(json!({"undone": label}))
@@ -230,6 +231,7 @@ fn redo(s: &mut Session, p: &Json) -> Result<Json> {
         crate::push_history(&mut d.undo, label.clone(), cur_wb, &d.wb, cur_selection);
     }
     super::extra::keep_watch_list(&now, &mut d.wb);
+    crate::cmd::purge_unlock_grants(&mut d.unlocked_ranges, &d.wb);
     d.calc.rebuild(&d.wb);
     d.revision += 1;
     Ok(json!({"redone": label}))

crates/engine/src/cmd/extra/scripts.rs

@@ -75,6 +75,9 @@ fn denied_script_step(id: &str, params: &Json) -> Option<String> {
     None
 }
 
+/// Commands that read the session's clipboard, which a script may use only for a copy made in its own workbook.
+const CLIPBOARD_READERS: [&str; 3] = ["edit.paste", "edit.pasteSpecial", "home.insertCopiedCells"];
+
 pub(super) fn trust_scripts(s: &mut Session, p: &Json) -> Result<Json> {
     // Only a missing `trusted` means "trust"; `"false"`, `0` or `null` are mistakes, not consent.
     let trusted = match p.get("trusted") {
@@ -86,6 +89,23 @@ pub(super) fn trust_scripts(s: &mut Session, p: &Json) -> Result<Json> {
     Ok(json!({"trusted": trusted}))
 }
 
+/// Whether step `id` with `params` takes cells from the session clipboard: not `edit.paste` of explicit
+/// text that differs from it (that pastes the text, see `edit::clipboard::paste`).
+fn reads_clipboard(s: &Session, id: &str, params: &Json) -> bool {
+    if !CLIPBOARD_READERS.contains(&id) {
+        return false;
+    }
+    let trim = |t: &str| t.trim_end_matches(['\r', '\n']).to_string();
+    match (id, str_param(params, "text")) {
+        ("edit.paste", Some(text)) => s.clipboard.as_ref().is_some_and(|c| trim(&c.text) == trim(text)),
+        _ => true,
+    }
+}
+
+fn d_uid(s: &Session) -> Result<u64> {
+    Ok(s.doc()?.uid)
+}
+
 /// Runs a stored script. Scripts in a workbook opened from a file run only once the workbook is
 /// trusted for this session (`automate.trustScripts`, or `trusted: true` on this call); steps that
 /// reach outside the workbook ([`denied_script_step`]) are refused before any step runs.
@@ -108,6 +128,7 @@ pub(super) fn run_script(s: &mut Session, p: &Json) -> Result<Json> {
         }
     }
     let _sandbox = crate::io::ScriptSandbox::enter();
+    let home = d_uid(s)?;
     let mut n = 0;
     // What ran, for a recorder in progress: the recording keeps these steps with the run, so
     // editing or deleting the script before the recording stops does not change what it saved.
@@ -117,9 +138,25 @@ pub(super) fn run_script(s: &mut Session, p: &Json) -> Result<Json> {
         if id.starts_with("automate.") {
             continue;
         }
+        if reads_clipboard(s, id, &st["params"]) && s.clipboard.as_ref().is_some_and(|c| c.doc_uid != home) {
+            return Err(bad("automate.runScript", format!("scripts can't run `{id}` on cells copied from another workbook")));
+        }
         let before = s.ui_requests.len();
         let wb_before = s.doc().ok().map(|d| (d.uid, d.wb.clone()));
-        let ran = s.execute(id, st["params"].clone());
+        // A stored step is not the person: an `approve` it carries is not consent to run a macro.
+        let mut params = st["params"].clone();
+        if let Some(o) = params.as_object_mut() {
+            o.remove("approve");
+        }
+        let ran = s.execute(id, params);
+        // A step (a nested macro, an alias of a window command) that switched windows would point the
+        // rest of the script at another workbook: put the script's own back and stop.
+        if s.doc().map(|d| d.uid).ok() != Some(home) {
+            if let Some(i) = s.docs.iter().position(|d| d.uid == home) {
+                s.set_active(i);
+            }
+            return Err(bad("automate.runScript", format!("`{id}` switched to another workbook; scripts stay in their own")));
+        }
         // A step that asks the host to open a URL leaves the app: drop the request and stop.
         if s.ui_requests.get(before..).is_some_and(|new| new.iter().any(|r| matches!(r, crate::UiRequest::OpenUrl(_)))) {
             let mut i = 0;

crates/engine/src/tests.rs

@@ -6480,6 +6480,34 @@ fn clearing_links_and_notes_keeps_allow_edit_ranges() {
     assert!(sh.hyperlinks.is_empty() && sh.comments.is_empty());
 }
 
+#[test]
+fn an_edit_range_grant_does_not_outlive_its_sheet_name() {
+    let mut s = s();
+    s.execute("review.allowEditRanges", json!({"action": "add", "title": "Kept", "range": "C5", "password": "example"})).unwrap();
+    s.execute("review.protectSheet", json!({})).unwrap();
+    s.execute("review.allowEditRanges", json!({"action": "unlock", "title": "Kept", "password": "example"})).unwrap();
+    assert!(!s.doc().unwrap().unlocked_ranges.is_empty());
+    // The sheet is renamed and another takes its name, with a range of the same title and password.
+    s.execute("review.unprotectSheet", json!({})).unwrap();
+    let old = s.doc().unwrap().wb.active().unwrap().name.clone();
+    s.execute("sheet.rename", json!({"name": "Renamed"})).unwrap();
+    assert!(s.doc().unwrap().unlocked_ranges.is_empty(), "the grant went with the old name");
+    s.execute("home.insertSheet", json!({"name": old})).unwrap();
+    s.execute("review.allowEditRanges", json!({"action": "add", "title": "Kept", "range": "C5", "password": "other"})).unwrap();
+    s.execute("review.protectSheet", json!({})).unwrap();
+    assert!(s.execute("cell.set", json!({"cell": "C5", "input": "1"})).is_err(), "the new sheet's range is locked");
+}
+
+#[test]
+fn undo_drops_the_grant_of_a_range_it_removes() {
+    let mut s = s();
+    s.execute("review.allowEditRanges", json!({"action": "add", "title": "Kept", "range": "C5", "password": "example"})).unwrap();
+    s.execute("review.allowEditRanges", json!({"action": "unlock", "title": "Kept", "password": "example"})).unwrap();
+    assert!(!s.doc().unwrap().unlocked_ranges.is_empty());
+    s.execute("edit.undo", json!({})).unwrap();
+    assert!(s.doc().unwrap().unlocked_ranges.is_empty(), "the range is gone, so is its grant");
+}
+
 #[test]
 fn formulatext_does_not_reveal_a_hidden_formula() {
     let mut s = s();

crates/engine/src/tests/macros.rs

@@ -2514,3 +2514,40 @@ fn a_step_that_deletes_a_form_control_after_a_partial_footprint_is_caught() {
     s.execute("macro.run", json!({"name": "Drop", "inputs": "A1", "overwrite": true})).unwrap();
     assert!(s.doc().unwrap().wb.active().unwrap().controls.is_empty());
 }
+
+#[test]
+fn a_script_cannot_paste_what_another_workbook_copied() {
+    let mut s = s();
+    let steps = json!([{"command": "edit.paste", "params": {"at": "B2"}}]);
+    s.execute("automate.newScript", json!({"name": "Paste", "commands": steps})).unwrap();
+    // A copy made in this workbook may be pasted by its script.
+    s.execute("cell.set", json!({"cell": "A1", "input": "mine"})).unwrap();
+    s.execute("edit.copy", json!({"range": "A1"})).unwrap();
+    s.execute("automate.runScript", json!({"name": "Paste"})).unwrap();
+    // A copy from another workbook is not read.
+    s.execute("file.new", json!({})).unwrap();
+    s.execute("cell.set", json!({"cell": "A1", "input": "secret"})).unwrap();
+    s.execute("edit.copy", json!({"range": "A1"})).unwrap();
+    s.set_active(0);
+    let err = s.execute("automate.runScript", json!({"name": "Paste"})).unwrap_err().to_string();
+    assert!(err.contains("another workbook"), "{err}");
+    // Explicit text that is not the clipboard's does not read it.
+    let own = json!([{"command": "edit.paste", "params": {"at": "C3", "text": "typed"}}]);
+    s.execute("automate.newScript", json!({"name": "Typed", "commands": own})).unwrap();
+    s.execute("automate.runScript", json!({"name": "Typed"})).unwrap();
+}
+
+#[test]
+fn a_script_step_cannot_approve_a_macro_for_the_person() {
+    let mut s = s();
+    let mut wb = gridcraft_model::Workbook::new();
+    wb.macros.push(crate::macros::parse_macro(&json!({"name": "Theirs", "output": {"onConflict": "overwrite"}, "steps": [{"command": "cell.set", "params": {"cell": "A1", "input": "ran"}}]})).unwrap());
+    let bytes = serde_json::to_vec(&wb).unwrap();
+    s.execute("file.open", json!({"name": "theirs.json", "base64": crate::io::base64_encode(&bytes)})).unwrap();
+    let steps = json!([{"command": "macro.run", "params": {"name": "Theirs", "approve": true}}]);
+    s.execute("automate.newScript", json!({"name": "Run", "commands": steps})).unwrap();
+    let r = s.execute("automate.runScript", json!({"name": "Run", "trusted": true}));
+    assert!(matches!(r, Err(EngineError::Approve(_))), "{r:?}");
+    assert!(s.macro_approvals.is_empty(), "the step's flag approved nothing");
+    assert!(v(&s, "A1").is_empty());
+}