path open for permission

crates/wasi-common/src/blockless/prompter.rs

@@ -227,10 +227,11 @@ impl PermissionPrompter for TtyPrompter {
         api_name: Option<&str>,
         is_unary: bool,
     ) -> PromptResponse {
+
         if !std::io::stdin().is_terminal() || !std::io::stderr().is_terminal() {
             return PromptResponse::Deny;
         };
-
+        
         #[allow(clippy::print_stderr)]
         if message.len() > MAX_PERMISSION_PROMPT_LENGTH {
             eprintln!("❌ Permission prompt length ({} bytes) was larger than the configured maximum length ({} bytes): denying request.", message.len(), MAX_PERMISSION_PROMPT_LENGTH);
@@ -241,13 +242,13 @@ impl PermissionPrompter for TtyPrompter {
 
         #[cfg(unix)]
         let metadata_before = get_stdin_metadata().unwrap();
-
+        
         // Lock stdio streams, so no other output is written while the prompt is
         // displayed.
         let stdout_lock = std::io::stdout().lock();
         let mut stderr_lock = std::io::stderr().lock();
         let mut stdin_lock = std::io::stdin().lock();
-
+        
         // For security reasons we must consume everything in stdin so that previously
         // buffered data cannot affect the prompt.
         #[allow(clippy::print_stderr)]
@@ -266,7 +267,7 @@ impl PermissionPrompter for TtyPrompter {
         } else {
             "[y/n] (y = yes, allow; n = no, deny)".to_string()
         };
-
+        
         // output everything in one shot to make the tests more reliable
         {
             let mut output = String::new();
@@ -295,8 +296,9 @@ impl PermissionPrompter for TtyPrompter {
             writeln!(&mut output, "┠─ {}", colors::italic(&msg)).unwrap();
             write!(&mut output, "┗ {}", colors::bold("Allow?")).unwrap();
             write!(&mut output, " {opts} > ").unwrap();
-
+            
             stderr_lock.write_all(output.as_bytes()).unwrap();
+            stderr_lock.flush().unwrap();
         }
 
         let value = loop {

crates/wasi-common/src/ctx.rs

@@ -29,7 +29,7 @@ pub struct WasiCtxInner {
     pub clocks: WasiClocks,
     pub sched: Box<dyn WasiSched>,
     pub table: Table,
-    pub permissions_container: BlsRuntimePermissionsContainer,
+    pub perms_container: BlsRuntimePermissionsContainer,
     pub blockless_config: Mutex<Option<BlocklessConfig>>,
 }
 
@@ -46,7 +46,7 @@ impl WasiCtx {
             env: StringArray::new(),
             random: Mutex::new(random),
             blockless_config: Mutex::new(None),
-            permissions_container: BlsRuntimePermissionsContainer::new_with_env_cwd(cwd),
+            perms_container: BlsRuntimePermissionsContainer::new_with_env_cwd(cwd),
             clocks,
             sched,
             table,

crates/wasi-common/src/snapshots/preview_1.rs

@@ -11,7 +11,7 @@ use crate::{
     I32Exit, SystemTimeSpec, WasiCtx,
 };
 use cap_std::time::{Duration, SystemClock};
-use std::borrow::Cow;
+use std::{borrow::Cow, path::PathBuf};
 use std::io::{IoSlice, IoSliceMut};
 use std::ops::Deref;
 use std::sync::Arc;
@@ -684,6 +684,7 @@ impl wasi_snapshot_preview1::WasiSnapshotPreview1 for WasiCtx {
         dirfd: types::Fd,
         path: GuestPtr<str>,
     ) -> Result<(), Error> {
+        println!("{dirfd}");
         self.table()
             .get_dir(u32::from(dirfd))?
             .dir
@@ -778,6 +779,7 @@ impl wasi_snapshot_preview1::WasiSnapshotPreview1 for WasiCtx {
         _fs_rights_inheriting: types::Rights,
         fdflags: types::Fdflags,
     ) -> Result<types::Fd, Error> {
+
         let table = self.table();
         let dirfd = u32::from(dirfd);
         if table.is::<FileEntry>(dirfd) {
@@ -790,7 +792,10 @@ impl wasi_snapshot_preview1::WasiSnapshotPreview1 for WasiCtx {
         let oflags = OFlags::from(&oflags);
         let fdflags = FdFlags::from(fdflags);
         let path = memory.as_cow_str(path)?;
-
+        let path_buf: PathBuf = PathBuf::from(path.as_ref());
+        self.perms_container
+            .check_read_path(&path_buf, Some("path open"))
+            .map_err(|_| Error::perm())?;
         let read = fs_rights_base.contains(types::Rights::FD_READ);
         let write = fs_rights_base.contains(types::Rights::FD_WRITE);
         let access_mode = if read {
@@ -802,7 +807,6 @@ impl wasi_snapshot_preview1::WasiSnapshotPreview1 for WasiCtx {
         } else {
             FileAccessMode::empty()
         };
-
         let file = dir_entry
             .dir
             .open_file(symlink_follow, path.deref(), oflags, read, write, fdflags)