signing identity: an import macOS accepts

CHANGELOG.md

@@ -37,6 +37,11 @@ Anything that changes what the dashboard, the admin or a widget can do gets a li
   sessions after 30 minutes (on by default), and group the board by application.
 
 ### Fixed
+- The helper keeps its Input Monitoring and Accessibility grants across rebuilds again, on Macs
+  where `scripts/create-signing-identity.sh` failed at the import step ("MAC verification failed").
+  The identity was never created, so every build stayed ad-hoc signed and lost the permissions
+  granted to the one before, which shows up as the touch panel clicking on another display
+  (@mcouzinet, #8).
 - Spotify's progress bar moves: on a Mac whose number format uses a decimal comma the position
   read as nothing, and the bar sat at zero. It now glides across each second instead of stepping,
   lands at once on a seek, a new track or a pause, and empties when Spotify closes (@mcouzinet, #4).

docs/troubleshooting.md

@@ -15,6 +15,7 @@ and "Notifications: active" above the toggles, and *Log…* opens the supervised
 | "Touch: taken by another driver" | Touchscreen Gestures, another driver or a `--probe` run holds the panel | Quit it, and unload its launchd agent so it does not come back |
 | "Fence: permission missing" | Accessibility not granted | Add "Fremkit Helper" under Privacy & Security → Accessibility, then relaunch it |
 | Permissions reset after every rebuild | Ad-hoc signature: a new code identity each build | Run `scripts/create-signing-identity.sh`, rebuild, grant once more |
+| The helper is ticked in Privacy & Security and still has no permission | One stale grant per past ad-hoc identity, which macOS keeps in its cache and matches before the new one | `tccutil reset ListenEvent dev.fremkit.helper && tccutil reset Accessibility dev.fremkit.helper`, relaunch the helper, and accept the two prompts. Removing and re-adding the app in the list does not clear those entries |
 | Printer unreachable (`EHOSTUNREACH`) while `ping` and `curl` work | Local Network not granted to the app that runs the server | Allow it under Privacy & Security → Local Network |
 | "Server: external" | Something already answers port 4242, so the helper steps aside | Expected under `pnpm dev`; otherwise stop the stray server, or turn *Manage the server* off |
 

scripts/create-signing-identity.sh

@@ -60,24 +60,33 @@ with open(path, "w", encoding="utf-8") as handle:
     handle.write(text.replace(pattern, name))
 PY
 
+# macOS ships LibreSSL at /usr/bin/openssl, and the Security framework reads the bundle it
+# writes. An OpenSSL 3 in the PATH (Homebrew's, which comes first on most Macs with one) packages
+# it with algorithms `security import` refuses, and the import fails on the MAC check with a
+# message about a wrong password. `-legacy` is meant to cover that, but only works on a build
+# that ships the legacy provider, which Homebrew's does not.
+OPENSSL=openssl
+[ -x /usr/bin/openssl ] && OPENSSL=/usr/bin/openssl
+
+# A throwaway password rather than none: an empty one fails the same MAC check on current macOS,
+# whatever wrote the bundle. It lives as long as this script and goes no further.
+P12_PASSWORD="fremkit-$RANDOM$RANDOM$RANDOM"
+
 echo "==> generating the key and certificate (10 years)"
-openssl req -x509 -newkey rsa:2048 -nodes -sha256 -days 3650 \
+"$OPENSSL" req -x509 -newkey rsa:2048 -nodes -sha256 -days 3650 \
     -config "$WORK/openssl.cnf" \
     -keyout "$WORK/key.pem" -out "$WORK/cert.pem" >/dev/null 2>&1
 
 echo "==> packaging them as PKCS#12"
-openssl pkcs12 -export -legacy \
-    -inkey "$WORK/key.pem" -in "$WORK/cert.pem" \
-    -name "$IDENTITY" -passout pass: -out "$WORK/identity.p12" >/dev/null 2>&1 \
-  || openssl pkcs12 -export \
+"$OPENSSL" pkcs12 -export \
     -inkey "$WORK/key.pem" -in "$WORK/cert.pem" \
-    -name "$IDENTITY" -passout pass: -out "$WORK/identity.p12" >/dev/null 2>&1
+    -name "$IDENTITY" -passout "pass:$P12_PASSWORD" -out "$WORK/identity.p12" >/dev/null 2>&1
 
 echo "==> importing into the login keychain"
 # `-x` marks the private key non-extractable: it can sign, but it cannot be exported back out of
 # the keychain. Only codesign is allowed to use it — `security` itself was on that list, which
 # let any script dump the key with `security export`.
-security import "$WORK/identity.p12" -k "$KEYCHAIN" -P "" -x \
+security import "$WORK/identity.p12" -k "$KEYCHAIN" -P "$P12_PASSWORD" -x \
     -T /usr/bin/codesign >/dev/null
 
 echo "==> trusting it for code signing"