meson: Plumb hardening with Rust

Signed-off-by: Daiki Ueno <[email protected]>

common/meson.build

@@ -18,7 +18,20 @@ libp11_common_sources = [
   'vsock.c'
 ]
 
+libp11_common_libs = []
+
+if get_option('rustc')
+  libp11_common_rust_sources = [
+    'path.rs'
+  ]
+  libp11_common_rust = static_library('p11_common_rust',
+                                      libp11_common_rust_sources,
+                                      rust_crate_type: 'staticlib')
+  libp11_common_libs += libp11_common_rust
+endif
+
 libp11_common = static_library('p11-common', libp11_common_sources,
+                               link_with: libp11_common_libs,
                                gnu_symbol_visibility: 'hidden',
                                include_directories: configinc)
 

common/path.c

@@ -60,6 +60,7 @@
 #endif
 
 
+#if defined(ENABLE_RUSTC) && ENABLE_RUSTC
 char *
 p11_path_base (const char *path)
 {
@@ -92,6 +93,7 @@ p11_path_base (const char *path)
 
 	return strndup (beg, end - beg);
 }
+#endif
 
 static inline bool
 is_path_separator (char ch)

common/path.rs

@@ -0,0 +1,49 @@
+//
+// Copyright (c) 2021 Red Hat Inc.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions
+// are met:
+//
+//     * Redistributions of source code must retain the above
+//       copyright notice, this list of conditions and the
+//       following disclaimer.
+//     * Redistributions in binary form must reproduce the
+//       above copyright notice, this list of conditions and
+//       the following disclaimer in the documentation and/or
+//       other materials provided with the distribution.
+//     * The names of contributors to this software may not be
+//       used to endorse or promote products derived from this
+//       software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+// COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+// OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+// AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
+// DAMAGE.
+//
+
+use std::ffi::{CStr, CString, OsStr};
+use std::os::raw::c_char;
+use std::path::PathBuf;
+use std::os::unix::ffi::OsStrExt;
+
+#[no_mangle]
+pub extern fn p11_path_base(name: *const c_char) -> *mut c_char {
+    let slice = unsafe { CStr::from_ptr(name) };
+    let path = PathBuf::from(OsStr::from_bytes(slice.to_bytes()));
+    let bytes = path
+        .file_name()
+        .and_then(|base| Some(base.as_bytes()))
+        .unwrap_or("".as_bytes());
+    CString::new(bytes)
+        .and_then(|c_string| Ok(c_string.into_raw()))
+        .unwrap_or(std::ptr::null_mut())
+}

meson.build

@@ -63,6 +63,11 @@ if get_option('nls') and cc.has_header('libintl.h')
   conf.set('ENABLE_NLS', 1)
 endif
 
+conf.set10('ENABLE_RUSTC', get_option('rustc'))
+if get_option('rustc')
+  add_languages('rust')
+endif
+
 prefix = get_option('prefix')
 datadir = get_option('datadir')
 bindir = get_option('bindir')

meson_options.txt

@@ -65,3 +65,7 @@ option('nls', type : 'boolean',
 option('test', type : 'boolean',
        value : true,
        description : 'Enable building test programs')
+
+option('rustc', type : 'boolean',
+       value : false,
+       description : 'Enable hardening using Rust')