Adding upstream version 110.0.1.upstream/110.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1227 insertions, 0 deletions

diff --git a/security/manager/ssl/builtins/src/pkcs11.rs b/security/manager/ssl/builtins/src/pkcs11.rs
new file mode 100644
index 0000000000..56620f4a68
--- /dev/null
+++ b/security/manager/ssl/builtins/src/pkcs11.rs
@@ -0,0 +1,1227 @@
+/* -*- Mode: rust; rust-indent-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#![allow(non_snake_case)]
+
+use pkcs11_bindings::*;
+use std::slice;
+
+use std::collections::btree_map::Entry;
+use std::collections::{BTreeMap, BTreeSet};
+use std::sync::atomic::{AtomicU32, Ordering};
+use std::sync::{Mutex, MutexGuard};
+
+use crate::internal::{get_attribute, search};
+use crate::internal::{ObjectHandle, Query, SearchResult};
+
+use crate::version::*;
+
+const BUILTINS_VERSION: CK_VERSION = CK_VERSION {
+    major: NSS_BUILTINS_LIBRARY_VERSION_MAJOR,
+    minor: NSS_BUILTINS_LIBRARY_VERSION_MINOR,
+};
+
+const FIRMWARE_VERSION: CK_VERSION = CK_VERSION {
+    major: NSS_BUILTINS_FIRMWARE_VERSION_MAJOR,
+    minor: NSS_BUILTINS_FIRMWARE_VERSION_MINOR,
+};
+
+const CRYPTOKI_VERSION: CK_VERSION = CK_VERSION {
+    major: NSS_BUILTINS_CRYPTOKI_VERSION_MAJOR,
+    minor: NSS_BUILTINS_CRYPTOKI_VERSION_MINOR,
+};
+const HARDWARE_VERSION: CK_VERSION = CK_VERSION {
+    major: NSS_BUILTINS_HARDWARE_VERSION_MAJOR,
+    minor: NSS_BUILTINS_HARDWARE_VERSION_MINOR,
+};
+
+const MANUFACTURER_ID_BYTES: &[u8; 32] = b"Mozilla Foundation              ";
+const LIBRARY_DESCRIPTION_BYTES: &[u8; 32] = b"NSS Builtin Object Cryptoki Modu";
+
+const SLOT_COUNT: CK_ULONG = 1;
+const SLOT_ID_ROOTS: CK_SLOT_ID = 1;
+const SLOT_DESCRIPTION_ROOTS_BYTES: &[u8; 64] =
+    b"NSS Builtin Objects                                             ";
+
+const TOKEN_LABEL_ROOTS_BYTES: &[u8; 32] = b"Builtin Object Token            ";
+const TOKEN_MODEL_BYTES: &[u8; 16] = b"1               ";
+const TOKEN_SERIAL_NUMBER_BYTES: &[u8; 16] = b"1               ";
+const TOKEN_UTC_TIME: &[u8; 16] = b"                ";
+
+#[derive(Debug)]
+struct PK11Error(CK_RV);
+
+// The token assigns session handles using a counter. It would make sense to use a 64 bit counter,
+// as there would then be no risk of exhausting the session handle space. However,
+// CK_SESSION_HANDLE is defined as a C unsigned long, which is a u32 on some platforms.
+//
+// We start the counter at 1 since PKCS#11 reserves 0 to signal an invalid handle
+//
+type SessionHandle = u32;
+static NEXT_HANDLE: AtomicU32 = AtomicU32::new(1);
+
+// The token needs to keep track of which sessions are open.
+//
+type SessionSet = BTreeSet<SessionHandle>;
+static OPEN_SESSIONS: Mutex<Option<SessionSet>> = Mutex::new(None);
+
+// Helper functions for accessing OPEN_SESSIONS
+//
+type SessionSetGuard = MutexGuard<'static, Option<SessionSet>>;
+
+fn get_open_sessions_guard() -> Result<SessionSetGuard, PK11Error> {
+    OPEN_SESSIONS
+        .lock()
+        .map_err(|_| PK11Error(CKR_DEVICE_ERROR))
+}
+
+fn get_open_sessions(guard: &mut SessionSetGuard) -> Result<&mut SessionSet, PK11Error> {
+    let sessions = guard
+        .as_mut()
+        .ok_or(PK11Error(CKR_CRYPTOKI_NOT_INITIALIZED))?;
+    Ok(sessions)
+}
+
+// The token needs to cache search results until the client reads them or closes the session.
+//
+type SearchCache = BTreeMap<SessionHandle, SearchResult>;
+static SEARCHES: Mutex<Option<SearchCache>> = Mutex::new(None);
+
+// Helper functions for accessing SEARCHES
+//
+type SearchCacheGuard = MutexGuard<'static, Option<SearchCache>>;
+
+fn get_search_cache_guard() -> Result<SearchCacheGuard, PK11Error> {
+    SEARCHES.lock().map_err(|_| PK11Error(CKR_DEVICE_ERROR))
+}
+
+fn get_search_cache(guard: &mut SearchCacheGuard) -> Result<&mut SearchCache, PK11Error> {
+    let searches = guard
+        .as_mut()
+        .ok_or(PK11Error(CKR_CRYPTOKI_NOT_INITIALIZED))?;
+    Ok(searches)
+}
+
+fn validate_session(handle: SessionHandle) -> Result<(), PK11Error> {
+    let mut guard = get_open_sessions_guard()?;
+    let sessions = get_open_sessions(&mut guard)?;
+    if sessions.contains(&handle) {
+        return Ok(());
+    }
+    if handle < NEXT_HANDLE.load(Ordering::SeqCst) {
+        Err(PK11Error(CKR_SESSION_CLOSED))
+    } else {
+        // Possible that NEXT_HANDLE wrapped and we should return CKR_SESSION_CLOSED.
+        // But this is best-effort.
+        Err(PK11Error(CKR_SESSION_HANDLE_INVALID))
+    }
+}
+
+// The internal implementation of C_Initialize
+fn initialize() -> Result<(), PK11Error> {
+    {
+        let mut search_cache_guard = get_search_cache_guard()?;
+        if (*search_cache_guard).is_some() {
+            return Err(PK11Error(CKR_CRYPTOKI_ALREADY_INITIALIZED));
+        }
+        *search_cache_guard = Some(SearchCache::default());
+    }
+
+    {
+        let mut session_guard = get_open_sessions_guard()?;
+        if (*session_guard).is_some() {
+            return Err(PK11Error(CKR_CRYPTOKI_ALREADY_INITIALIZED));
+        }
+        *session_guard = Some(SessionSet::default());
+    }
+
+    Ok(())
+}
+
+// The internal implementation of C_Finalize
+fn finalize() -> Result<(), PK11Error> {
+    {
+        let mut guard = get_search_cache_guard()?;
+        // Try to access the search cache to ensure we're initialized.
+        // Returns CKR_CRYPTOKI_NOT_INITIALIZED if we're not.
+        let _ = get_search_cache(&mut guard)?;
+        *guard = None;
+    }
+
+    let mut guard = get_open_sessions_guard()?;
+    let _ = get_open_sessions(&mut guard)?;
+    *guard = None;
+
+    Ok(())
+}
+
+// Internal implementation of C_OpenSession
+fn open_session() -> Result<SessionHandle, PK11Error> {
+    let mut handle = NEXT_HANDLE.fetch_add(1, Ordering::SeqCst);
+    if handle == 0 {
+        // skip handle 0 if the addition wraps
+        handle = NEXT_HANDLE.fetch_add(1, Ordering::SeqCst);
+    }
+
+    let mut guard = get_open_sessions_guard()?;
+    let sessions = get_open_sessions(&mut guard)?;
+    while !sessions.insert(handle) {
+        // this only executes if NEXT_HANDLE wraps while sessions with
+        // small handles are still open.
+        handle = NEXT_HANDLE.fetch_add(1, Ordering::SeqCst);
+    }
+
+    Ok(handle)
+}
+
+// Internal implementation of C_CloseSession
+fn close_session(session: SessionHandle) -> Result<(), PK11Error> {
+    {
+        let mut guard = get_search_cache_guard()?;
+        let searches = get_search_cache(&mut guard)?;
+        searches.remove(&session);
+    }
+
+    {
+        let mut guard = get_open_sessions_guard()?;
+        let sessions = get_open_sessions(&mut guard)?;
+        if sessions.remove(&session) {
+            Ok(())
+        } else if session < NEXT_HANDLE.load(Ordering::SeqCst) {
+            Err(PK11Error(CKR_SESSION_CLOSED))
+        } else {
+            Err(PK11Error(CKR_SESSION_HANDLE_INVALID))
+        }
+    }
+}
+
+// Internal implementation of C_CloseAllSessions
+fn close_all_sessions() -> Result<(), PK11Error> {
+    {
+        let mut guard = get_search_cache_guard()?;
+        let searches = get_search_cache(&mut guard)?;
+        searches.clear();
+    }
+
+    {
+        let mut guard = get_open_sessions_guard()?;
+        let sessions = get_open_sessions(&mut guard)?;
+        sessions.clear();
+    }
+
+    Ok(())
+}
+
+// Internal implementation of C_FindObjectsInit
+fn find_objects_init(session: SessionHandle, query: &Query) -> Result<usize, PK11Error> {
+    validate_session(session)?;
+
+    let results = search(query);
+    let count = results.len();
+
+    let mut guard = get_search_cache_guard()?;
+    let searches = get_search_cache(&mut guard)?;
+    match searches.entry(session) {
+        Entry::Occupied(_) => Err(PK11Error(CKR_OPERATION_ACTIVE)),
+        Entry::Vacant(v) => {
+            v.insert(results);
+            Ok(count)
+        }
+    }
+}
+
+// Internal implementation of C_FindObjects
+fn find_objects(session: SessionHandle, out: &mut [CK_OBJECT_HANDLE]) -> Result<usize, PK11Error> {
+    validate_session(session)?;
+
+    let mut guard = get_search_cache_guard()?;
+    let searches = get_search_cache(&mut guard)?;
+    if let Some(objects) = searches.get_mut(&session) {
+        for (i, out_i) in out.iter_mut().enumerate() {
+            match objects.pop() {
+                Some(object) => *out_i = object.into(),
+                None => return Ok(i),
+            }
+        }
+        Ok(out.len())
+    } else {
+        Ok(0)
+    }
+}
+
+// Internal implementation of C_FindObjectsFinal
+fn find_objects_final(session: SessionHandle) -> Result<(), PK11Error> {
+    validate_session(session)?;
+
+    let mut guard = get_search_cache_guard()?;
+    let searches = get_search_cache(&mut guard)?;
+    searches.remove(&session);
+    Ok(())
+}
+
+extern "C" fn C_Initialize(_pInitArgs: CK_VOID_PTR) -> CK_RV {
+    match initialize() {
+        Ok(_) => CKR_OK,
+        Err(PK11Error(e)) => e,
+    }
+}
+
+extern "C" fn C_Finalize(pReserved: CK_VOID_PTR) -> CK_RV {
+    if !pReserved.is_null() {
+        return CKR_ARGUMENTS_BAD;
+    }
+    match finalize() {
+        Ok(_) => CKR_OK,
+        Err(PK11Error(e)) => e,
+    }
+}
+
+extern "C" fn C_GetInfo(pInfo: CK_INFO_PTR) -> CK_RV {
+    if pInfo.is_null() {
+        return CKR_ARGUMENTS_BAD;
+    }
+    unsafe {
+        *pInfo = CK_INFO {
+            cryptokiVersion: CRYPTOKI_VERSION,
+            manufacturerID: *MANUFACTURER_ID_BYTES,
+            flags: 0,
+            libraryDescription: *LIBRARY_DESCRIPTION_BYTES,
+            libraryVersion: BUILTINS_VERSION,
+        };
+    }
+    CKR_OK
+}
+
+extern "C" fn C_GetSlotList(
+    _tokenPresent: CK_BBOOL,
+    pSlotList: CK_SLOT_ID_PTR,
+    pulCount: CK_ULONG_PTR,
+) -> CK_RV {
+    if pulCount.is_null() {
+        return CKR_ARGUMENTS_BAD;
+    }
+    if !pSlotList.is_null() {
+        if unsafe { *pulCount } < SLOT_COUNT {
+            return CKR_BUFFER_TOO_SMALL;
+        }
+        unsafe {
+            *pSlotList = SLOT_ID_ROOTS;
+        }
+    }
+    unsafe {
+        *pulCount = SLOT_COUNT;
+    }
+    CKR_OK
+}
+
+extern "C" fn C_GetSlotInfo(slotID: CK_SLOT_ID, pInfo: CK_SLOT_INFO_PTR) -> CK_RV {
+    if (slotID != SLOT_ID_ROOTS) || pInfo.is_null() {
+        return CKR_ARGUMENTS_BAD;
+    }
+    unsafe {
+        *pInfo = CK_SLOT_INFO {
+            slotDescription: *SLOT_DESCRIPTION_ROOTS_BYTES,
+            manufacturerID: *MANUFACTURER_ID_BYTES,
+            flags: CKF_TOKEN_PRESENT,
+            hardwareVersion: HARDWARE_VERSION,
+            firmwareVersion: FIRMWARE_VERSION,
+        };
+    }
+    CKR_OK
+}
+
+extern "C" fn C_GetTokenInfo(slotID: CK_SLOT_ID, pInfo: CK_TOKEN_INFO_PTR) -> CK_RV {
+    if (slotID != SLOT_ID_ROOTS) || pInfo.is_null() {
+        return CKR_ARGUMENTS_BAD;
+    }
+    unsafe {
+        *pInfo = CK_TOKEN_INFO {
+            label: *TOKEN_LABEL_ROOTS_BYTES,
+            manufacturerID: *MANUFACTURER_ID_BYTES,
+            model: *TOKEN_MODEL_BYTES,
+            serialNumber: *TOKEN_SERIAL_NUMBER_BYTES,
+            flags: CKF_WRITE_PROTECTED,
+            ulMaxSessionCount: CK_UNAVAILABLE_INFORMATION,
+            ulSessionCount: 0,
+            ulMaxRwSessionCount: CK_UNAVAILABLE_INFORMATION,
+            ulRwSessionCount: 0,
+            ulMaxPinLen: CK_UNAVAILABLE_INFORMATION,
+            ulMinPinLen: CK_UNAVAILABLE_INFORMATION,
+            ulTotalPublicMemory: CK_UNAVAILABLE_INFORMATION,
+            ulFreePublicMemory: CK_UNAVAILABLE_INFORMATION,
+            ulTotalPrivateMemory: CK_UNAVAILABLE_INFORMATION,
+            ulFreePrivateMemory: CK_UNAVAILABLE_INFORMATION,
+            hardwareVersion: HARDWARE_VERSION,
+            firmwareVersion: FIRMWARE_VERSION,
+            utcTime: *TOKEN_UTC_TIME,
+        };
+    }
+    CKR_OK
+}
+
+extern "C" fn C_GetMechanismList(
+    slotID: CK_SLOT_ID,
+    _pMechanismList: CK_MECHANISM_TYPE_PTR,
+    pulCount: CK_ULONG_PTR,
+) -> CK_RV {
+    if slotID != SLOT_ID_ROOTS || pulCount.is_null() {
+        return CKR_ARGUMENTS_BAD;
+    }
+    unsafe {
+        *pulCount = 0;
+    }
+    CKR_OK
+}
+
+extern "C" fn C_GetMechanismInfo(
+    _slotID: CK_SLOT_ID,
+    _type: CK_MECHANISM_TYPE,
+    _pInfo: CK_MECHANISM_INFO_PTR,
+) -> CK_RV {
+    CKR_FUNCTION_NOT_SUPPORTED
+}
+
+extern "C" fn C_InitToken(
+    _slotID: CK_SLOT_ID,
+    _pPin: CK_UTF8CHAR_PTR,
+    _ulPinLen: CK_ULONG,
+    _pLabel: CK_UTF8CHAR_PTR,
+) -> CK_RV {
+    CKR_FUNCTION_NOT_SUPPORTED
+}
+
+extern "C" fn C_InitPIN(
+    _hSession: CK_SESSION_HANDLE,
+    _pPin: CK_UTF8CHAR_PTR,
+    _ulPinLen: CK_ULONG,
+) -> CK_RV {
+    CKR_FUNCTION_NOT_SUPPORTED
+}
+
+extern "C" fn C_SetPIN(
+    _hSession: CK_SESSION_HANDLE,
+    _pOldPin: CK_UTF8CHAR_PTR,
+    _ulOldLen: CK_ULONG,
+    _pNewPin: CK_UTF8CHAR_PTR,
+    _ulNewLen: CK_ULONG,
+) -> CK_RV {
+    CKR_FUNCTION_NOT_SUPPORTED
+}
+
+extern "C" fn C_OpenSession(
+    slotID: CK_SLOT_ID,
+    flags: CK_FLAGS,
+    _pApplication: CK_VOID_PTR,
+    _Notify: CK_NOTIFY,
+    phSession: CK_SESSION_HANDLE_PTR,
+) -> CK_RV {
+    if slotID != SLOT_ID_ROOTS || phSession.is_null() {
+        return CKR_ARGUMENTS_BAD;
+    }
+    // [pkcs11-base-v3.0, Section 5.6.1]
+    // For legacy reasons, the CKF_SERIAL_SESSION bit MUST always be set; if a call to
+    // C_OpenSession does not have this bit set, the call should return unsuccessfully with the
+    // error code CKR_SESSION_PARALLEL_NOT_SUPPORTED.
+    if flags & CKF_SERIAL_SESSION == 0 {
+        return CKR_SESSION_PARALLEL_NOT_SUPPORTED;
+    }
+    let session_id = match open_session() {
+        Ok(session_id) => session_id as CK_SESSION_HANDLE,
+        Err(PK11Error(e)) => return e,
+    };
+    unsafe { *phSession = session_id };
+    CKR_OK
+}
+
+extern "C" fn C_CloseSession(hSession: CK_SESSION_HANDLE) -> CK_RV {
+    let session: SessionHandle = match hSession.try_into() {
+        Ok(session) => session,
+        Err(_) => return CKR_SESSION_HANDLE_INVALID,
+    };
+    match close_session(session) {
+        Ok(_) => CKR_OK,
+        Err(PK11Error(e)) => e,
+    }
+}
+
+extern "C" fn C_CloseAllSessions(slotID: CK_SLOT_ID) -> CK_RV {
+    if slotID != SLOT_ID_ROOTS {
+        return CKR_ARGUMENTS_BAD;
+    }
+    match close_all_sessions() {
+        Ok(_) => CKR_OK,
+        Err(PK11Error(e)) => e,
+    }
+}
+
+extern "C" fn C_GetSessionInfo(_hSession: CK_SESSION_HANDLE, _pInfo: CK_SESSION_INFO_PTR) -> CK_RV {
+    CKR_FUNCTION_NOT_SUPPORTED
+}
+
+extern "C" fn C_GetOperationState(
+    _hSession: CK_SESSION_HANDLE,
+    _pOperationState: CK_BYTE_PTR,
+    _pulOperationStateLen: CK_ULONG_PTR,
+) -> CK_RV {
+    CKR_FUNCTION_NOT_SUPPORTED
+}
+
+extern "C" fn C_SetOperationState(
+    _hSession: CK_SESSION_HANDLE,
+    _pOperationState: CK_BYTE_PTR,
+    _ulOperationStateLen: CK_ULONG,
+    _hEncryptionKey: CK_OBJECT_HANDLE,
+    _hAuthenticationKey: CK_OBJECT_HANDLE,
+) -> CK_RV {
+    CKR_FUNCTION_NOT_SUPPORTED
+}
+
+extern "C" fn C_Login(
+    _hSession: CK_SESSION_HANDLE,
+    _userType: CK_USER_TYPE,
+    _pPin: CK_UTF8CHAR_PTR,
+    _ulPinLen: CK_ULONG,
+) -> CK_RV {
+    CKR_FUNCTION_NOT_SUPPORTED
+}
+
+extern "C" fn C_Logout(_hSession: CK_SESSION_HANDLE) -> CK_RV {
+    CKR_OK
+}
+
+extern "C" fn C_CreateObject(
+    _hSession: CK_SESSION_HANDLE,
+    _pTemplate: CK_ATTRIBUTE_PTR,
+    _ulCount: CK_ULONG,
+    _phObject: CK_OBJECT_HANDLE_PTR,
+) -> CK_RV {
+    CKR_FUNCTION_NOT_SUPPORTED
+}
+
+extern "C" fn C_CopyObject(
+    _hSession: CK_SESSION_HANDLE,
+    _hObject: CK_OBJECT_HANDLE,
+    _pTemplate: CK_ATTRIBUTE_PTR,
+    _ulCount: CK_ULONG,
+    _phNewObject: CK_OBJECT_HANDLE_PTR,
+) -> CK_RV {
+    CKR_FUNCTION_NOT_SUPPORTED
+}
+
+extern "C" fn C_DestroyObject(_hSession: CK_SESSION_HANDLE, _hObject: CK_OBJECT_HANDLE) -> CK_RV {
+    CKR_FUNCTION_NOT_SUPPORTED
+}
+
+extern "C" fn C_GetObjectSize(
+    _hSession: CK_SESSION_HANDLE,
+    _hObject: CK_OBJECT_HANDLE,
+    _pulSize: CK_ULONG_PTR,
+) -> CK_RV {
+    CKR_FUNCTION_NOT_SUPPORTED
+}
+
+extern "C" fn C_GetAttributeValue(
+    _hSession: CK_SESSION_HANDLE,
+    hObject: CK_OBJECT_HANDLE,
+    pTemplate: CK_ATTRIBUTE_PTR,
+    ulCount: CK_ULONG,
+) -> CK_RV {
+    if pTemplate.is_null() {
+        return CKR_ARGUMENTS_BAD;
+    }
+
+    let count: usize = match ulCount.try_into() {
+        Ok(count) => count,
+        Err(_) => return CKR_ARGUMENTS_BAD,
+    };
+
+    // C_GetAttributeValue has a session handle parameter because PKCS#11 objects can have
+    // session-bound lifetimes and access controls. We don't have any session objects, and all of
+    // our token objects are public. So there's no good reason to validate the session handle.
+    //
+    //let session: SessionHandle = match hSession.try_into() {
+    //    Ok(session) => session,
+    //    Err(_) => return CKR_SESSION_HANDLE_INVALID,
+    //};
+    //
+    //if let Err(PK11Error(e)) = validate_session(session) {
+    //    return e;
+    //}
+
+    let handle: ObjectHandle = match hObject.try_into() {
+        Ok(handle) => handle,
+        Err(_) => return CKR_OBJECT_HANDLE_INVALID,
+    };
+
+    let attrs: &mut [CK_ATTRIBUTE] = unsafe { slice::from_raw_parts_mut(pTemplate, count) };
+
+    let mut rv = CKR_OK;
+
+    // Handle requests with null pValue fields
+    for attr in attrs.iter_mut().filter(|x| x.pValue.is_null()) {
+        attr.ulValueLen = match get_attribute(attr.type_, &handle) {
+            None => {
+                // [pkcs11-base-v3.0, Section 5.7.5]
+                // 2. [...] if the specified value for the object is invalid (the object does not possess
+                //    such an attribute), then the ulValueLen field in that triple is modified to hold the
+                //    value CK_UNAVAILABLE_INFORMATION.
+                rv = CKR_ATTRIBUTE_TYPE_INVALID;
+                CK_UNAVAILABLE_INFORMATION
+            }
+            Some(attr) => {
+                // [pkcs11-base-v3.0, Section 5.7.5]
+                // 3. [...] if the pValue field has the value NULL_PTR, then the ulValueLen field is modified
+                //    to hold the exact length of the specified attribute for the object.
+                attr.len() as CK_ULONG
+            }
+        }
+    }
+
+    // Handle requests with non-null pValue fields
+    for attr in attrs.iter_mut().filter(|x| !x.pValue.is_null()) {
+        let dst_len: usize = match attr.ulValueLen.try_into() {
+            Ok(dst_len) => dst_len,
+            Err(_) => return CKR_ARGUMENTS_BAD,
+        };
+        attr.ulValueLen = match get_attribute(attr.type_, &handle) {
+            None => {
+                // [pkcs11-base-v3.0, Section 5.7.5]
+                // 2. [...] if the specified value for the object is invalid (the object does not possess
+                //    such an attribute), then the ulValueLen field in that triple is modified to hold the
+                //    value CK_UNAVAILABLE_INFORMATION.
+                rv = CKR_ATTRIBUTE_TYPE_INVALID;
+                CK_UNAVAILABLE_INFORMATION
+            }
+            Some(src) if dst_len >= src.len() => {
+                // [pkcs11-base-v3.0, Section 5.7.5]
+                // 4. [...] if the length specified in ulValueLen is large enough to hold the value
+                //    of the specified attribute for the object, then that attribute is copied into
+                //    the buffer located at pValue, and the ulValueLen field is modified to hold
+                //    the exact length of the attribute.
+                let dst: &mut [u8] =
+                    unsafe { slice::from_raw_parts_mut(attr.pValue as *mut u8, dst_len) };
+                dst[..src.len()].copy_from_slice(src);
+                src.len() as CK_ULONG
+            }
+            _ => {
+                // [pkcs11-base-v3.0, Section 5.7.5]
+                // 5. Otherwise, the ulValueLen field is modified to hold the value
+                //    CK_UNAVAILABLE_INFORMATION.
+                rv = CKR_BUFFER_TOO_SMALL;
+                CK_UNAVAILABLE_INFORMATION
+            }
+        };
+    }
+
+    // [pkcs11-base-v3.0, Section 5.7.5]
+    // If case 2 applies to any of the requested attributes, then the call should return the value
+    // CKR_ATTRIBUTE_TYPE_INVALID.  If case 5 applies to any of the requested attributes, then the
+    // call should return the value CKR_BUFFER_TOO_SMALL.  As usual, if more than one of these
+    // error codes is applicable, Cryptoki may return any of them.  Only if none of them applies to
+    // any of the requested attributes will CKR_OK be returned.
+    rv
+}
+
+extern "C" fn C_SetAttributeValue(
+    _hSession: CK_SESSION_HANDLE,
+    _hObject: CK_OBJECT_HANDLE,
+    _pTemplate: CK_ATTRIBUTE_PTR,
+    _ulCount: CK_ULONG,
+) -> CK_RV {
+    CKR_FUNCTION_NOT_SUPPORTED
+}
+
+extern "C" fn C_FindObjectsInit(
+    hSession: CK_SESSION_HANDLE,
+    pTemplate: CK_ATTRIBUTE_PTR,
+    ulCount: CK_ULONG,
+) -> CK_RV {
+    if pTemplate.is_null() {
+        return CKR_ARGUMENTS_BAD;
+    }
+    let count: usize = match ulCount.try_into() {
+        Ok(count) => count,
+        Err(_) => return CKR_ARGUMENTS_BAD,
+    };
+    let session: SessionHandle = match hSession.try_into() {
+        Ok(session) => session,
+        Err(_) => return CKR_SESSION_HANDLE_INVALID,
+    };
+
+    let raw_attrs: &[CK_ATTRIBUTE] = unsafe { slice::from_raw_parts_mut(pTemplate, count) };
+
+    let mut query: Vec<(CK_ATTRIBUTE_TYPE, &[u8])> = Vec::with_capacity(raw_attrs.len());
+    for attr in raw_attrs {
+        match usize::try_from(attr.ulValueLen) {
+            Ok(len) => query.push((attr.type_, unsafe {
+                slice::from_raw_parts_mut(attr.pValue as *mut u8, len)
+            })),
+            Err(_) => return CKR_ARGUMENTS_BAD,
+        }
+    }
+
+    match find_objects_init(session, &query) {
+        Ok(_) => CKR_OK,
+        Err(PK11Error(e)) => e,
+    }
+}
+
+extern "C" fn C_FindObjects(
+    hSession: CK_SESSION_HANDLE,
+    phObject: CK_OBJECT_HANDLE_PTR,
+    ulMaxObjectCount: CK_ULONG,
+    pulObjectCount: CK_ULONG_PTR,
+) -> CK_RV {
+    if phObject.is_null() || pulObjectCount.is_null() {
+        return CKR_ARGUMENTS_BAD;
+    }
+    let max_object_count: usize = match ulMaxObjectCount.try_into() {
+        Ok(max_object_count) => max_object_count,
+        Err(_) => return CKR_ARGUMENTS_BAD,
+    };
+    let session: SessionHandle = match hSession.try_into() {
+        Ok(session) => session,
+        Err(_) => return CKR_SESSION_HANDLE_INVALID,
+    };
+    let out: &mut [CK_OBJECT_HANDLE] =
+        unsafe { slice::from_raw_parts_mut(phObject, max_object_count) };
+    match find_objects(session, out) {
+        Ok(num_found) => {
+            unsafe { *pulObjectCount = num_found as CK_ULONG };
+            CKR_OK
+        }
+        Err(PK11Error(e)) => e,
+    }
+}
+
+extern "C" fn C_FindObjectsFinal(hSession: CK_SESSION_HANDLE) -> CK_RV {
+    let session: SessionHandle = match hSession.try_into() {
+        Ok(session) => session,
+        Err(_) => return CKR_SESSION_HANDLE_INVALID,
+    };
+    match find_objects_final(session) {
+        Ok(()) => CKR_OK,
+        Err(PK11Error(e)) => e,
+    }
+}
+
+extern "C" fn C_EncryptInit(
+    _hSession: CK_SESSION_HANDLE,
+    _pMechanism: CK_MECHANISM_PTR,
+    _hKey: CK_OBJECT_HANDLE,
+) -> CK_RV {
+    CKR_FUNCTION_NOT_SUPPORTED
+}
+
+extern "C" fn C_Encrypt(
+    _hSession: CK_SESSION_HANDLE,
+    _pData: CK_BYTE_PTR,
+    _ulDataLen: CK_ULONG,
+    _pEncryptedData: CK_BYTE_PTR,
+    _pulEncryptedDataLen: CK_ULONG_PTR,
+) -> CK_RV {
+    CKR_FUNCTION_NOT_SUPPORTED
+}
+
+extern "C" fn C_EncryptUpdate(
+    _hSession: CK_SESSION_HANDLE,
+    _pPart: CK_BYTE_PTR,
+    _ulPartLen: CK_ULONG,
+    _pEncryptedPart: CK_BYTE_PTR,
+    _pulEncryptedPartLen: CK_ULONG_PTR,
+) -> CK_RV {
+    CKR_FUNCTION_NOT_SUPPORTED
+}
+
+extern "C" fn C_EncryptFinal(
+    _hSession: CK_SESSION_HANDLE,
+    _pLastEncryptedPart: CK_BYTE_PTR,
+    _pulLastEncryptedPartLen: CK_ULONG_PTR,
+) -> CK_RV {
+    CKR_FUNCTION_NOT_SUPPORTED
+}
+
+extern "C" fn C_DecryptInit(
+    _hSession: CK_SESSION_HANDLE,
+    _pMechanism: CK_MECHANISM_PTR,
+    _hKey: CK_OBJECT_HANDLE,
+) -> CK_RV {
+    CKR_FUNCTION_NOT_SUPPORTED
+}
+
+extern "C" fn C_Decrypt(
+    _hSession: CK_SESSION_HANDLE,
+    _pEncryptedData: CK_BYTE_PTR,
+    _ulEncryptedDataLen: CK_ULONG,
+    _pData: CK_BYTE_PTR,
+    _pulDataLen: CK_ULONG_PTR,
+) -> CK_RV {
+    CKR_FUNCTION_NOT_SUPPORTED
+}
+
+extern "C" fn C_DecryptUpdate(
+    _hSession: CK_SESSION_HANDLE,
+    _pEncryptedPart: CK_BYTE_PTR,
+    _ulEncryptedPartLen: CK_ULONG,
+    _pPart: CK_BYTE_PTR,
+    _pulPartLen: CK_ULONG_PTR,
+) -> CK_RV {
+    CKR_FUNCTION_NOT_SUPPORTED
+}
+
+extern "C" fn C_DecryptFinal(
+    _hSession: CK_SESSION_HANDLE,
+    _pLastPart: CK_BYTE_PTR,
+    _pulLastPartLen: CK_ULONG_PTR,
+) -> CK_RV {
+    CKR_FUNCTION_NOT_SUPPORTED
+}
+
+extern "C" fn C_DigestInit(_hSession: CK_SESSION_HANDLE, _pMechanism: CK_MECHANISM_PTR) -> CK_RV {
+    CKR_FUNCTION_NOT_SUPPORTED
+}
+
+extern "C" fn C_Digest(
+    _hSession: CK_SESSION_HANDLE,
+    _pData: CK_BYTE_PTR,
+    _ulDataLen: CK_ULONG,
+    _pDigest: CK_BYTE_PTR,
+    _pulDigestLen: CK_ULONG_PTR,
+) -> CK_RV {
+    CKR_FUNCTION_NOT_SUPPORTED
+}
+
+extern "C" fn C_DigestUpdate(
+    _hSession: CK_SESSION_HANDLE,
+    _pPart: CK_BYTE_PTR,
+    _ulPartLen: CK_ULONG,
+) -> CK_RV {
+    CKR_FUNCTION_NOT_SUPPORTED
+}
+
+extern "C" fn C_DigestKey(_hSession: CK_SESSION_HANDLE, _hKey: CK_OBJECT_HANDLE) -> CK_RV {
+    CKR_FUNCTION_NOT_SUPPORTED
+}
+
+extern "C" fn C_DigestFinal(
+    _hSession: CK_SESSION_HANDLE,
+    _pDigest: CK_BYTE_PTR,
+    _pulDigestLen: CK_ULONG_PTR,
+) -> CK_RV {
+    CKR_FUNCTION_NOT_SUPPORTED
+}
+
+extern "C" fn C_SignInit(
+    _hSession: CK_SESSION_HANDLE,
+    _pMechanism: CK_MECHANISM_PTR,
+    _hKey: CK_OBJECT_HANDLE,
+) -> CK_RV {
+    CKR_FUNCTION_NOT_SUPPORTED
+}
+
+extern "C" fn C_Sign(
+    _hSession: CK_SESSION_HANDLE,
+    _pData: CK_BYTE_PTR,
+    _ulDataLen: CK_ULONG,
+    _pSignature: CK_BYTE_PTR,
+    _pulSignatureLen: CK_ULONG_PTR,
+) -> CK_RV {
+    CKR_FUNCTION_NOT_SUPPORTED
+}
+
+extern "C" fn C_SignUpdate(
+    _hSession: CK_SESSION_HANDLE,
+    _pPart: CK_BYTE_PTR,
+    _ulPartLen: CK_ULONG,
+) -> CK_RV {
+    CKR_FUNCTION_NOT_SUPPORTED
+}
+
+extern "C" fn C_SignFinal(
+    _hSession: CK_SESSION_HANDLE,
+    _pSignature: CK_BYTE_PTR,
+    _pulSignatureLen: CK_ULONG_PTR,
+) -> CK_RV {
+    CKR_FUNCTION_NOT_SUPPORTED
+}
+
+extern "C" fn C_SignRecoverInit(
+    _hSession: CK_SESSION_HANDLE,
+    _pMechanism: CK_MECHANISM_PTR,
+    _hKey: CK_OBJECT_HANDLE,
+) -> CK_RV {
+    CKR_FUNCTION_NOT_SUPPORTED
+}
+
+extern "C" fn C_SignRecover(
+    _hSession: CK_SESSION_HANDLE,
+    _pData: CK_BYTE_PTR,
+    _ulDataLen: CK_ULONG,
+    _pSignature: CK_BYTE_PTR,
+    _pulSignatureLen: CK_ULONG_PTR,
+) -> CK_RV {
+    CKR_FUNCTION_NOT_SUPPORTED
+}
+
+extern "C" fn C_VerifyInit(
+    _hSession: CK_SESSION_HANDLE,
+    _pMechanism: CK_MECHANISM_PTR,
+    _hKey: CK_OBJECT_HANDLE,
+) -> CK_RV {
+    CKR_FUNCTION_NOT_SUPPORTED
+}
+
+extern "C" fn C_Verify(
+    _hSession: CK_SESSION_HANDLE,
+    _pData: CK_BYTE_PTR,
+    _ulDataLen: CK_ULONG,
+    _pSignature: CK_BYTE_PTR,
+    _ulSignatureLen: CK_ULONG,
+) -> CK_RV {
+    CKR_FUNCTION_NOT_SUPPORTED
+}
+
+extern "C" fn C_VerifyUpdate(
+    _hSession: CK_SESSION_HANDLE,
+    _pPart: CK_BYTE_PTR,
+    _ulPartLen: CK_ULONG,
+) -> CK_RV {
+    CKR_FUNCTION_NOT_SUPPORTED
+}
+
+extern "C" fn C_VerifyFinal(
+    _hSession: CK_SESSION_HANDLE,
+    _pSignature: CK_BYTE_PTR,
+    _ulSignatureLen: CK_ULONG,
+) -> CK_RV {
+    CKR_FUNCTION_NOT_SUPPORTED
+}
+
+extern "C" fn C_VerifyRecoverInit(
+    _hSession: CK_SESSION_HANDLE,
+    _pMechanism: CK_MECHANISM_PTR,
+    _hKey: CK_OBJECT_HANDLE,
+) -> CK_RV {
+    CKR_FUNCTION_NOT_SUPPORTED
+}
+
+extern "C" fn C_VerifyRecover(
+    _hSession: CK_SESSION_HANDLE,
+    _pSignature: CK_BYTE_PTR,
+    _ulSignatureLen: CK_ULONG,
+    _pData: CK_BYTE_PTR,
+    _pulDataLen: CK_ULONG_PTR,
+) -> CK_RV {
+    CKR_FUNCTION_NOT_SUPPORTED
+}
+
+extern "C" fn C_DigestEncryptUpdate(
+    _hSession: CK_SESSION_HANDLE,
+    _pPart: CK_BYTE_PTR,
+    _ulPartLen: CK_ULONG,
+    _pEncryptedPart: CK_BYTE_PTR,
+    _pulEncryptedPartLen: CK_ULONG_PTR,
+) -> CK_RV {
+    CKR_FUNCTION_NOT_SUPPORTED
+}
+
+extern "C" fn C_DecryptDigestUpdate(
+    _hSession: CK_SESSION_HANDLE,
+    _pEncryptedPart: CK_BYTE_PTR,
+    _ulEncryptedPartLen: CK_ULONG,
+    _pPart: CK_BYTE_PTR,
+    _pulPartLen: CK_ULONG_PTR,
+) -> CK_RV {
+    CKR_FUNCTION_NOT_SUPPORTED
+}
+
+extern "C" fn C_SignEncryptUpdate(
+    _hSession: CK_SESSION_HANDLE,
+    _pPart: CK_BYTE_PTR,
+    _ulPartLen: CK_ULONG,
+    _pEncryptedPart: CK_BYTE_PTR,
+    _pulEncryptedPartLen: CK_ULONG_PTR,
+) -> CK_RV {
+    CKR_FUNCTION_NOT_SUPPORTED
+}
+
+extern "C" fn C_DecryptVerifyUpdate(
+    _hSession: CK_SESSION_HANDLE,
+    _pEncryptedPart: CK_BYTE_PTR,
+    _ulEncryptedPartLen: CK_ULONG,
+    _pPart: CK_BYTE_PTR,
+    _pulPartLen: CK_ULONG_PTR,
+) -> CK_RV {
+    CKR_FUNCTION_NOT_SUPPORTED
+}
+
+extern "C" fn C_GenerateKey(
+    _hSession: CK_SESSION_HANDLE,
+    _pMechanism: CK_MECHANISM_PTR,
+    _pTemplate: CK_ATTRIBUTE_PTR,
+    _ulCount: CK_ULONG,
+    _phKey: CK_OBJECT_HANDLE_PTR,
+) -> CK_RV {
+    CKR_FUNCTION_NOT_SUPPORTED
+}
+
+extern "C" fn C_GenerateKeyPair(
+    _hSession: CK_SESSION_HANDLE,
+    _pMechanism: CK_MECHANISM_PTR,
+    _pPublicKeyTemplate: CK_ATTRIBUTE_PTR,
+    _ulPublicKeyAttributeCount: CK_ULONG,
+    _pPrivateKeyTemplate: CK_ATTRIBUTE_PTR,
+    _ulPrivateKeyAttributeCount: CK_ULONG,
+    _phPublicKey: CK_OBJECT_HANDLE_PTR,
+    _phPrivateKey: CK_OBJECT_HANDLE_PTR,
+) -> CK_RV {
+    CKR_FUNCTION_NOT_SUPPORTED
+}
+
+extern "C" fn C_WrapKey(
+    _hSession: CK_SESSION_HANDLE,
+    _pMechanism: CK_MECHANISM_PTR,
+    _hWrappingKey: CK_OBJECT_HANDLE,
+    _hKey: CK_OBJECT_HANDLE,
+    _pWrappedKey: CK_BYTE_PTR,
+    _pulWrappedKeyLen: CK_ULONG_PTR,
+) -> CK_RV {
+    CKR_FUNCTION_NOT_SUPPORTED
+}
+
+extern "C" fn C_UnwrapKey(
+    _hSession: CK_SESSION_HANDLE,
+    _pMechanism: CK_MECHANISM_PTR,
+    _hUnwrappingKey: CK_OBJECT_HANDLE,
+    _pWrappedKey: CK_BYTE_PTR,
+    _ulWrappedKeyLen: CK_ULONG,
+    _pTemplate: CK_ATTRIBUTE_PTR,
+    _ulAttributeCount: CK_ULONG,
+    _phKey: CK_OBJECT_HANDLE_PTR,
+) -> CK_RV {
+    CKR_FUNCTION_NOT_SUPPORTED
+}
+
+extern "C" fn C_DeriveKey(
+    _hSession: CK_SESSION_HANDLE,
+    _pMechanism: CK_MECHANISM_PTR,
+    _hBaseKey: CK_OBJECT_HANDLE,
+    _pTemplate: CK_ATTRIBUTE_PTR,
+    _ulAttributeCount: CK_ULONG,
+    _phKey: CK_OBJECT_HANDLE_PTR,
+) -> CK_RV {
+    CKR_FUNCTION_NOT_SUPPORTED
+}
+
+extern "C" fn C_SeedRandom(
+    _hSession: CK_SESSION_HANDLE,
+    _pSeed: CK_BYTE_PTR,
+    _ulSeedLen: CK_ULONG,
+) -> CK_RV {
+    CKR_FUNCTION_NOT_SUPPORTED
+}
+
+extern "C" fn C_GenerateRandom(
+    _hSession: CK_SESSION_HANDLE,
+    _RandomData: CK_BYTE_PTR,
+    _ulRandomLen: CK_ULONG,
+) -> CK_RV {
+    CKR_FUNCTION_NOT_SUPPORTED
+}
+
+extern "C" fn C_GetFunctionStatus(_hSession: CK_SESSION_HANDLE) -> CK_RV {
+    CKR_FUNCTION_NOT_SUPPORTED
+}
+
+extern "C" fn C_CancelFunction(_hSession: CK_SESSION_HANDLE) -> CK_RV {
+    CKR_FUNCTION_NOT_SUPPORTED
+}
+
+extern "C" fn C_WaitForSlotEvent(
+    _flags: CK_FLAGS,
+    _pSlot: CK_SLOT_ID_PTR,
+    _pRserved: CK_VOID_PTR,
+) -> CK_RV {
+    CKR_FUNCTION_NOT_SUPPORTED
+}
+
+pub static mut FUNCTION_LIST: CK_FUNCTION_LIST = CK_FUNCTION_LIST {
+    version: CRYPTOKI_VERSION,
+    C_Initialize: Some(C_Initialize),
+    C_Finalize: Some(C_Finalize),
+    C_GetInfo: Some(C_GetInfo),
+    C_GetFunctionList: None,
+    C_GetSlotList: Some(C_GetSlotList),
+    C_GetSlotInfo: Some(C_GetSlotInfo),
+    C_GetTokenInfo: Some(C_GetTokenInfo),
+    C_GetMechanismList: Some(C_GetMechanismList),
+    C_GetMechanismInfo: Some(C_GetMechanismInfo),
+    C_InitToken: Some(C_InitToken),
+    C_InitPIN: Some(C_InitPIN),
+    C_SetPIN: Some(C_SetPIN),
+    C_OpenSession: Some(C_OpenSession),
+    C_CloseSession: Some(C_CloseSession),
+    C_CloseAllSessions: Some(C_CloseAllSessions),
+    C_GetSessionInfo: Some(C_GetSessionInfo),
+    C_GetOperationState: Some(C_GetOperationState),
+    C_SetOperationState: Some(C_SetOperationState),
+    C_Login: Some(C_Login),
+    C_Logout: Some(C_Logout),
+    C_CreateObject: Some(C_CreateObject),
+    C_CopyObject: Some(C_CopyObject),
+    C_DestroyObject: Some(C_DestroyObject),
+    C_GetObjectSize: Some(C_GetObjectSize),
+    C_GetAttributeValue: Some(C_GetAttributeValue),
+    C_SetAttributeValue: Some(C_SetAttributeValue),
+    C_FindObjectsInit: Some(C_FindObjectsInit),
+    C_FindObjects: Some(C_FindObjects),
+    C_FindObjectsFinal: Some(C_FindObjectsFinal),
+    C_EncryptInit: Some(C_EncryptInit),
+    C_Encrypt: Some(C_Encrypt),
+    C_EncryptUpdate: Some(C_EncryptUpdate),
+    C_EncryptFinal: Some(C_EncryptFinal),
+    C_DecryptInit: Some(C_DecryptInit),
+    C_Decrypt: Some(C_Decrypt),
+    C_DecryptUpdate: Some(C_DecryptUpdate),
+    C_DecryptFinal: Some(C_DecryptFinal),
+    C_DigestInit: Some(C_DigestInit),
+    C_Digest: Some(C_Digest),
+    C_DigestUpdate: Some(C_DigestUpdate),
+    C_DigestKey: Some(C_DigestKey),
+    C_DigestFinal: Some(C_DigestFinal),
+    C_SignInit: Some(C_SignInit),
+    C_Sign: Some(C_Sign),
+    C_SignUpdate: Some(C_SignUpdate),
+    C_SignFinal: Some(C_SignFinal),
+    C_SignRecoverInit: Some(C_SignRecoverInit),
+    C_SignRecover: Some(C_SignRecover),
+    C_VerifyInit: Some(C_VerifyInit),
+    C_Verify: Some(C_Verify),
+    C_VerifyUpdate: Some(C_VerifyUpdate),
+    C_VerifyFinal: Some(C_VerifyFinal),
+    C_VerifyRecoverInit: Some(C_VerifyRecoverInit),
+    C_VerifyRecover: Some(C_VerifyRecover),
+    C_DigestEncryptUpdate: Some(C_DigestEncryptUpdate),
+    C_DecryptDigestUpdate: Some(C_DecryptDigestUpdate),
+    C_SignEncryptUpdate: Some(C_SignEncryptUpdate),
+    C_DecryptVerifyUpdate: Some(C_DecryptVerifyUpdate),
+    C_GenerateKey: Some(C_GenerateKey),
+    C_GenerateKeyPair: Some(C_GenerateKeyPair),
+    C_WrapKey: Some(C_WrapKey),
+    C_UnwrapKey: Some(C_UnwrapKey),
+    C_DeriveKey: Some(C_DeriveKey),
+    C_SeedRandom: Some(C_SeedRandom),
+    C_GenerateRandom: Some(C_GenerateRandom),
+    C_GetFunctionStatus: Some(C_GetFunctionStatus),
+    C_CancelFunction: Some(C_CancelFunction),
+    C_WaitForSlotEvent: Some(C_WaitForSlotEvent),
+};
+
+#[no_mangle]
+pub unsafe fn BUILTINSC_GetFunctionList(ppFunctionList: CK_FUNCTION_LIST_PTR_PTR) -> CK_RV {
+    if ppFunctionList.is_null() {
+        return CKR_ARGUMENTS_BAD;
+    }
+    *ppFunctionList = &mut FUNCTION_LIST;
+    CKR_OK
+}
+
+#[cfg(test)]
+mod pkcs11_tests {
+    use crate::certdata::*;
+    use crate::internal::*;
+    use crate::pkcs11::*;
+
+    #[test]
+    fn test_main() {
+        // We need to run tests serially because of C_Initialize / C_Finalize calls.
+        test_simple();
+        test_c_get_function_list();
+        test_c_get_attribute();
+    }
+
+    fn test_simple() {
+        let query = &[(CKA_CLASS, CKO_CERTIFICATE_BYTES)];
+        initialize().expect("initialize should not fail.");
+        let hSession = open_session().expect("open_session should not fail.");
+        let count = find_objects_init(hSession, query).expect("find_objects_init should not fail.");
+        assert_eq!(count, BUILTINS.len());
+        let mut results: [CK_OBJECT_HANDLE; 10] = [0; 10];
+        let n_read =
+            find_objects(hSession, &mut results).expect("find_objects_init should not fail.");
+        assert_eq!(n_read, 10);
+        finalize().expect("finalize should not fail.");
+    }
+
+    fn test_c_get_function_list() {
+        let c_null = 0 as *mut std::ffi::c_void;
+        let mut pFunctionList: CK_FUNCTION_LIST_PTR = c_null as CK_FUNCTION_LIST_PTR;
+        let rv = unsafe { crate::pkcs11::BUILTINSC_GetFunctionList(&mut pFunctionList) };
+        assert_eq!(CKR_OK, rv);
+        if let Some(pC_Initialize) = unsafe { (*pFunctionList).C_Initialize } {
+            let rv = unsafe { pC_Initialize(c_null) };
+            assert_eq!(CKR_OK, rv);
+        } else {
+            assert!(false);
+        }
+
+        if let Some(pC_Finalize) = unsafe { (*pFunctionList).C_Finalize } {
+            let rv = unsafe { pC_Finalize(c_null) };
+            assert_eq!(CKR_OK, rv);
+        } else {
+            assert!(false);
+        }
+    }
+
+    fn test_c_get_attribute() {
+        let c_null = 0 as *mut std::ffi::c_void;
+        let template: &mut [CK_ATTRIBUTE] = &mut [CK_ATTRIBUTE {
+            type_: CKA_SUBJECT,
+            pValue: c_null,
+            ulValueLen: 0,
+        }];
+        let template_ptr = &mut template[0] as CK_ATTRIBUTE_PTR;
+        let object: CK_OBJECT_HANDLE = 2;
+        let mut session: CK_SESSION_HANDLE = 0;
+        assert_eq!(CKR_OK, C_Initialize(c_null));
+        assert_eq!(
+            CKR_OK,
+            C_OpenSession(
+                SLOT_ID_ROOTS,
+                CKF_SERIAL_SESSION,
+                c_null,
+                None,
+                &mut session as *mut CK_SESSION_HANDLE
+            )
+        );
+        assert_eq!(
+            CKR_OK,
+            C_GetAttributeValue(session, object, template_ptr, 1)
+        );
+        let len = template[0].ulValueLen as usize;
+        assert_eq!(len, BUILTINS[0].der_name.len());
+
+        let value: &mut [u8] = &mut vec![0; 1];
+        let value_ptr: *mut u8 = &mut value[0] as *mut u8;
+        template[0].pValue = value_ptr as *mut std::ffi::c_void;
+        template[0].ulValueLen = 1;
+        assert_eq!(
+            CKR_BUFFER_TOO_SMALL,
+            C_GetAttributeValue(session, object, template_ptr, 1)
+        );
+        assert_eq!(template[0].ulValueLen, CK_UNAVAILABLE_INFORMATION);
+
+        let value: &mut [u8] = &mut vec![0; len];
+        let value_ptr: *mut u8 = &mut value[0] as *mut u8;
+        template[0].pValue = value_ptr as *mut std::ffi::c_void;
+        template[0].ulValueLen = len as CK_ULONG;
+        assert_eq!(
+            CKR_OK,
+            C_GetAttributeValue(session, object, template_ptr, 1)
+        );
+        assert_eq!(value, BUILTINS[0].der_name);
+        assert_eq!(CKR_OK, C_Finalize(c_null));
+    }
+}