adds a windows-specific method to check if a command is safe (#4119)

refactors command_safety files into its own package, so we can add
platform-specific ones
Also creates a windows-specific of `is_known_safe_command` that just
returns false always, since that is what happens today.

codex-rs/core/src/command_safety/is_safe_command.rs

@@ -2,6 +2,14 @@ use crate::bash::try_parse_bash;
 use crate::bash::try_parse_word_only_commands_sequence;
 
 pub fn is_known_safe_command(command: &[String]) -> bool {
+    #[cfg(target_os = "windows")]
+    {
+        use super::windows_safe_commands::is_safe_command_windows;
+        if is_safe_command_windows(command) {
+            return true;
+        }
+    }
+
     if is_safe_to_call_with_exec(command) {
         return true;
     }
@@ -24,7 +32,6 @@ pub fn is_known_safe_command(command: &[String]) -> bool {
     {
         return true;
     }
-
     false
 }
 

codex-rs/core/src/command_safety/mod.rs

@@ -0,0 +1,3 @@
+pub mod is_safe_command;
+#[cfg(target_os = "windows")]
+pub mod windows_safe_commands;

codex-rs/core/src/command_safety/windows_safe_commands.rs

@@ -0,0 +1,25 @@
+// This is a WIP. This will eventually contain a real list of common safe Windows commands.
+pub fn is_safe_command_windows(_command: &[String]) -> bool {
+    false
+}
+
+#[cfg(test)]
+mod tests {
+    use super::is_safe_command_windows;
+
+    fn vec_str(args: &[&str]) -> Vec<String> {
+        args.iter().map(ToString::to_string).collect()
+    }
+
+    #[test]
+    fn everything_is_unsafe() {
+        for cmd in [
+            vec_str(&["powershell.exe", "-NoLogo", "-Command", "echo hello"]),
+            vec_str(&["copy", "foo", "bar"]),
+            vec_str(&["del", "file.txt"]),
+            vec_str(&["powershell.exe", "Get-ChildItem"]),
+        ] {
+            assert!(!is_safe_command_windows(&cmd));
+        }
+    }
+}

codex-rs/core/src/lib.rs

@@ -15,6 +15,7 @@ pub mod codex;
 mod codex_conversation;
 pub mod token_data;
 pub use codex_conversation::CodexConversation;
+mod command_safety;
 pub mod config;
 pub mod config_edit;
 pub mod config_profile;
@@ -29,7 +30,6 @@ pub mod exec_env;
 mod flags;
 pub mod git_info;
 pub mod internal_storage;
-mod is_safe_command;
 pub mod landlock;
 mod mcp_connection_manager;
 mod mcp_tool_call;
@@ -80,6 +80,7 @@ mod user_notification;
 pub mod util;
 
 pub use apply_patch::CODEX_APPLY_PATCH_ARG1;
+pub use command_safety::is_safe_command;
 pub use safety::get_platform_sandbox;
 // Re-export the protocol types from the standalone `codex-protocol` crate so existing
 // `codex_core::protocol::...` references continue to work across the workspace.