libpkcs11/common/metaUtil.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident	"%Z%%M%	%I%	%E% SMI"

#include <cryptoutil.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <strings.h>
#include "metaGlobal.h"

/*
 * meta_operation_init
 *
 */
CK_RV
meta_operation_init(int optype, meta_session_t *session,
	CK_MECHANISM *pMechanism, meta_object_t *key)
{
	CK_RV rv, save_rv;
	mechinfo_t **supporting_slots;
	CK_ULONG slotnum;
	unsigned long i, slotCount = 0;
	slot_session_t *init_session = NULL;

	/*
	 * If an operation is already active, cleanup existing operation
	 * and start a new one.
	 */
	if (session->op1.type != OP_UNUSED) {
		meta_operation_cleanup(session, session->op1.type, B_FALSE);
	}

	/*
	 * Get a list of capable slots.
	 *
	 * If the specified mechanism is used in this session last time,
	 * the list of capable slots is already retrieved.  We can save
	 * some processing, and just use that list of slots.
	 */
	if (((session->mech_support_info).mech != pMechanism->mechanism) ||
	    ((session->mech_support_info).num_supporting_slots == 0)) {
		(session->mech_support_info).mech = pMechanism->mechanism;
		rv = meta_mechManager_get_slots(&(session->mech_support_info),
		    B_FALSE);
		if (rv != CKR_OK) {
			goto finish;
		}
	}

	rv = CKR_FUNCTION_FAILED;

	/* The following 2 assignment is just to make the code more readable */
	slotCount = (session->mech_support_info).num_supporting_slots;
	supporting_slots = (session->mech_support_info).supporting_slots;

	/* Attempt to initialize operation on slots until one succeeds. */
	for (i = 0; i < slotCount; i++) {
		slot_object_t *init_key;
		CK_SLOT_ID fw_st_id;

		init_session = NULL;

		slotnum = supporting_slots[i]->slotnum;

		/*
		 * An actual session with the underlying slot is required
		 * for the operation.  When the operation is successfully
		 * completed, the underlying session with the slot
		 * is not released back to the list of available sessions
		 * pool.  This will help if the next operation can
		 * also be done on the same slot, because it avoids
		 * one extra trip to the session pool to get an idle session.
		 * If the operation can't be done on that slot,
		 * we release the session back to the session pool then.
		 */
		if (session->op1.session != NULL) {

			if ((session->op1.session)->slotnum == slotnum) {
				init_session = session->op1.session;
				/*
				 * set it to NULL for now, assign it to
				 * init_session again if it is successful
				 */
				session->op1.session = NULL;
			} else {
				init_session = NULL;
			}

		}

		if (!init_session) {
			rv = meta_get_slot_session(slotnum, &init_session,
			    session->session_flags);
			if (rv != CKR_OK) {
				goto loop_cleanup;
			}
		}

		/* if necessary, ensure a clone of the obj exists in slot */
		if (optype != OP_DIGEST) {
			rv = meta_object_get_clone(key, slotnum, init_session,
				&init_key);

			if (rv != CKR_OK) {
				goto loop_cleanup;
			}
		}

		fw_st_id = init_session->fw_st_id;
		switch (optype) {
			case OP_ENCRYPT:
				rv = FUNCLIST(fw_st_id)->C_EncryptInit(
					init_session->hSession, pMechanism,
					init_key->hObject);
				break;
			case OP_DECRYPT:
				rv = FUNCLIST(fw_st_id)->C_DecryptInit(
					init_session->hSession, pMechanism,
					init_key->hObject);
				break;
			case OP_DIGEST:
				rv = FUNCLIST(fw_st_id)->C_DigestInit(
					init_session->hSession, pMechanism);
				break;
			case OP_SIGN:
				rv = FUNCLIST(fw_st_id)->C_SignInit(
					init_session->hSession, pMechanism,
					init_key->hObject);
				break;
			case OP_VERIFY:
				rv = FUNCLIST(fw_st_id)->C_VerifyInit(
					init_session->hSession, pMechanism,
					init_key->hObject);
				break;
			case OP_SIGNRECOVER:
				rv = FUNCLIST(fw_st_id)->C_SignRecoverInit(
					init_session->hSession, pMechanism,
					init_key->hObject);
				break;
			case OP_VERIFYRECOVER:
				rv = FUNCLIST(fw_st_id)->C_VerifyRecoverInit(
					init_session->hSession, pMechanism,
					init_key->hObject);
				break;

			default:
				/*NOTREACHED*/
				rv = CKR_FUNCTION_FAILED;
				break;
		}

		if (rv == CKR_OK)
			break;

loop_cleanup:
		if (i == 0) {
			save_rv = rv;
		}

		if (init_session) {
			meta_release_slot_session(init_session);
			init_session = NULL;
		}

	}

	if (rv == CKR_OK) {

		/*
		 * If currently stored session is not the one being in use now,
		 * release the previous one and store the current one
		 */
		if ((session->op1.session) &&
		    (session->op1.session != init_session)) {
			meta_release_slot_session(session->op1.session);
		}

		/* Save the session */
		session->op1.session = init_session;
		session->op1.type = optype;
	} else {
		rv = save_rv;
	}

finish:
	return (rv);
}

/*
 * meta_do_operation
 *
 * NOTES:
 *
 * 1) The spec says you cannot do a C_Encrypt after a C_EncUpdate,
 *    but we don't explicitly enforce it here (ie, disallow doing MODE_SINGLE
 *    after a MODE_UPDATE). Instead, we just assume the underlying provider
 *    will catch the problem and return an appropriate error.
 *
 * 2) Note that the Verify operations are a little unusual, due to the
 *    PKCS#11 API. For C_Verify, the last two arguments are used as inputs,
 *    unlike the other single pass operations (where they are outputs). For
 *    C_VerifyFinal, in/inLen are passed instead of out/outLen like the other
 *    Final operations.
 *
 * 3) C_DigestKey is the only crypto operation that uses an object after
 *    the operation has been initialized. No other callers should provide
 *    this argument (use NULL).
 */
CK_RV
meta_do_operation(int optype, int mode,
    meta_session_t *session, meta_object_t *object,
    CK_BYTE *in, CK_ULONG inLen, CK_BYTE *out, CK_ULONG *outLen)
{
	CK_RV rv;
	CK_SESSION_HANDLE hSession;
	CK_SLOT_ID fw_st_id;
	slot_session_t *slot_session = NULL;
	slot_object_t *slot_object = NULL;

	boolean_t shutdown, finished_normally;

	if (optype != session->op1.type) {
		return (CKR_OPERATION_NOT_INITIALIZED);
	}

	slot_session = session->op1.session;

	if (slot_session) {
		hSession = slot_session->hSession;
		fw_st_id = slot_session->fw_st_id;
	} else {
		/* should never be here */
		return (CKR_FUNCTION_FAILED);
	}


	/* Do the operation... */
	switch (optype | mode) {
		case OP_ENCRYPT | MODE_SINGLE:
			rv = FUNCLIST(fw_st_id)->C_Encrypt(hSession, in,
			    inLen, out, outLen);
			break;
		case OP_ENCRYPT | MODE_UPDATE:
			rv = FUNCLIST(fw_st_id)->C_EncryptUpdate(hSession, in,
			    inLen, out, outLen);
			break;
		case OP_ENCRYPT | MODE_FINAL:
			rv = FUNCLIST(fw_st_id)->C_EncryptFinal(hSession, out,
			    outLen);
			break;

		case OP_DECRYPT | MODE_SINGLE:
			rv = FUNCLIST(fw_st_id)->C_Decrypt(hSession, in,
			    inLen, out, outLen);
			break;
		case OP_DECRYPT | MODE_UPDATE:
			rv = FUNCLIST(fw_st_id)->C_DecryptUpdate(hSession, in,
			    inLen, out, outLen);
			break;
		case OP_DECRYPT | MODE_FINAL:
			rv = FUNCLIST(fw_st_id)->C_DecryptFinal(hSession, out,
			    outLen);
			break;

		case OP_DIGEST | MODE_SINGLE:
			rv = FUNCLIST(fw_st_id)->C_Digest(hSession, in, inLen,
			    out, outLen);
			break;
		case OP_DIGEST | MODE_UPDATE:
			/* noOutputForOp = TRUE; */
			rv = FUNCLIST(fw_st_id)->C_DigestUpdate(hSession, in,
			    inLen);
			break;
		case OP_DIGEST | MODE_UPDATE_WITHKEY:
			/* noOutputForOp = TRUE; */
			/*
			 * For C_DigestKey, a key is provided and
			 * we need the clone.
			 */
			rv = meta_object_get_clone(object,
			    slot_session->slotnum, slot_session, &slot_object);
			if (rv == CKR_OK)
				rv = FUNCLIST(fw_st_id)->C_DigestKey(hSession,
				    slot_object->hObject);
			break;
		case OP_DIGEST | MODE_FINAL:
			rv = FUNCLIST(fw_st_id)->C_DigestFinal(hSession, out,
			    outLen);
			break;


		case OP_SIGN | MODE_SINGLE:
			rv = FUNCLIST(fw_st_id)->C_Sign(hSession, in, inLen,
			    out, outLen);
			break;
		case OP_SIGN | MODE_UPDATE:
			/* noOutputForOp = TRUE; */
			rv = FUNCLIST(fw_st_id)->C_SignUpdate(hSession, in,
			    inLen);
			break;
		case OP_SIGN | MODE_FINAL:
			rv = FUNCLIST(fw_st_id)->C_SignFinal(hSession, out,
			    outLen);
			break;

		case OP_VERIFY | MODE_SINGLE:
			/* noOutputForOp = TRUE; */
			/* Yes, use *outLen not outLen (think in2/in2Len) */
			rv = FUNCLIST(fw_st_id)->C_Verify(hSession, in,
			    inLen, out, *outLen);
			break;
		case OP_VERIFY | MODE_UPDATE:
			/* noOutputForOp = TRUE; */
			rv = FUNCLIST(fw_st_id)->C_VerifyUpdate(hSession, in,
			    inLen);
			break;
		case OP_VERIFY | MODE_FINAL:
			/* noOutputForOp = TRUE; */
			/* Yes, use in/inLen instead of out/outLen */
			rv = FUNCLIST(fw_st_id)->C_VerifyFinal(hSession, in,
			    inLen);
			break;

		case OP_SIGNRECOVER | MODE_SINGLE:
			rv = FUNCLIST(fw_st_id)->C_SignRecover(hSession, in,
			    inLen, out, outLen);
			break;
		case OP_VERIFYRECOVER | MODE_SINGLE:
			rv = FUNCLIST(fw_st_id)->C_VerifyRecover(hSession, in,
			    inLen, out, outLen);
			break;

		default:
			rv = CKR_FUNCTION_FAILED;
	}


	/*
	 * Mark the operation type as inactive if an abnormal error
	 * happens, or if the operation normally results in an inactive
	 * operation state.
	 *
	 * NOTE: The spec isn't very explicit about what happens when you
	 * call C_FooFinal (or C_Foo) with a NULL output buffer (to get the
	 * output size), but there is no output. Technically this should be
	 * no different than the normal case (ie, when there is output), and
	 * the operation should remain active until the second call actually
	 * terminates it. However, one could make the case that there is no
	 * need for a second call, since no data is available. This presents
	 * dilemma for metaslot, because we don't know if the operation is
	 * going to remain active or not. We will assume a strict reading of
	 * the spec, the operation will remain active.
	 */
	if (rv == CKR_BUFFER_TOO_SMALL ||
	    (rv == CKR_OK && out == NULL && optype != OP_VERIFY)) {
		/* Leave op active for retry (with larger buffer). */
		shutdown = B_FALSE;
	} else if (rv != CKR_OK) {
		shutdown = B_TRUE;
		finished_normally = B_FALSE;
	} else { /* CKR_OK */
		if (mode == MODE_SINGLE || mode == MODE_FINAL) {
			shutdown = B_TRUE;
			finished_normally = B_TRUE;
		} else { /* mode == MODE_UPDATE */
			shutdown = B_FALSE;
		}
	}

	if (shutdown)
		meta_operation_cleanup(session, optype, finished_normally);

	return (rv);
}

/*
 * meta_operation_cleanup
 *
 * Cleans up an operation in the specified session.
 * If the operation did not finish normally, it will force
 * the operation to terminate.
 */
void
meta_operation_cleanup(meta_session_t *session, int optype,
    boolean_t finished_normally)
{
	operation_info_t *op;
	CK_SESSION_HANDLE hSession;
	CK_SLOT_ID fw_st_id;

	if (!finished_normally) {
		CK_BYTE dummy_buf[8];

		if (session->op1.type == optype)
			op = &session->op1;
		else
			return;

		hSession = op->session->hSession;
		fw_st_id = op->session->fw_st_id;

		/*
		 * There's no simple, reliable way to abort an
		 * operation. So, we'll force the operation to finish.
		 *
		 * We are here either because we need to abort either after
		 * C_xxxxxInit() or C_xxxxxUpdate().
		 *
		 * We will call C_xxxxxUpdate() with invalid argument to
		 * force the operation to abort.  According to the PKCS#11
		 * spec, any call to C_xxxxxUpdate() returns in an error
		 * will terminate the current operation.
		 */

		switch (optype) {
		    case OP_ENCRYPT:
			(void) FUNCLIST(fw_st_id)->C_EncryptUpdate(hSession,
			    NULL, 8, dummy_buf, NULL);
			break;
		    case OP_DECRYPT:
			(void) FUNCLIST(fw_st_id)->C_DecryptUpdate(hSession,
			    NULL, 8, dummy_buf, NULL);
			break;
		    case OP_DIGEST:
			(void) FUNCLIST(fw_st_id)->C_DigestUpdate(hSession,
			    NULL, 8);
			break;
		    case OP_SIGN:
			(void) FUNCLIST(fw_st_id)->C_SignUpdate(hSession,
			    NULL, 8);
			break;
		    case OP_SIGNRECOVER:
			(void) FUNCLIST(fw_st_id)->C_SignRecover(hSession,
			    NULL, 8, dummy_buf, NULL);
			break;
		    case OP_VERIFY:
			(void) FUNCLIST(fw_st_id)->C_VerifyUpdate(hSession,
			    NULL, 8);
			break;
		    case OP_VERIFYRECOVER:
			(void) FUNCLIST(fw_st_id)->C_VerifyRecover(hSession,
			    NULL, 8, dummy_buf, NULL);
			break;
		    default:
			/*NOTREACHED*/
			break;
		}
		meta_release_slot_session(session->op1.session);
		session->op1.session = NULL;
	}

	session->op1.type = OP_UNUSED;
}

/*
 * Gets the list of slots that supports the specified mechanism.
 *
 * If "token_only", check if the keystore slot supports the specified mech,
 * if so, return that slot only
 *
 * Otherwise, get list of all slots that support the mech.
 *
 */
static CK_RV
get_slotlist_for_mech(CK_MECHANISM_TYPE mech_type,
    mech_support_info_t *mech_support_info,
    mechinfo_t ***slots, unsigned long *slot_count, boolean_t token_only)
{
	boolean_t mech_supported = B_FALSE;
	CK_RV rv = CKR_OK;

	if (token_only) {
		rv = meta_mechManager_slot_supports_mech(mech_type,
		    get_keystore_slotnum(), &mech_supported,
		    &((mech_support_info->supporting_slots)[0]), B_FALSE);

		if (rv != CKR_OK) {
			return (rv);
		}

		if (mech_supported) {
			mech_support_info->mech = mech_type;
			/*
			 * Want to leave this at 0, that way, when
			 * other operation needs to
			 * use this mechanism, but not just for the
			 * keystore slot, we will look at other slots
			 */
			mech_support_info->num_supporting_slots = 0;
			*slots = mech_support_info->supporting_slots;
			*slot_count = 1;
		} else {
			rv = CKR_FUNCTION_FAILED;
		}
	} else {
		/*
		 * Get a list of slots that support this mech .
		 *
		 * If the specified mechanism is used last time,
		 * the list of capable slots is already retrieved.
		 * We can save some processing, and just use that list of slots.
		 */
		if ((mech_support_info->mech != mech_type) ||
		    (mech_support_info->num_supporting_slots == 0)) {
			mech_support_info->mech = mech_type;
			rv = meta_mechManager_get_slots(mech_support_info,
			    B_FALSE);
			if (rv != CKR_OK) {
				return (CKR_FUNCTION_FAILED);
			}
		}
		*slots = mech_support_info->supporting_slots;
		*slot_count = mech_support_info->num_supporting_slots;
	}
	return (rv);
}

/*
 * meta_generate_keys
 *
 * Generates symmetric (k1=key, k2=null) or asymmetric (k1=pub, k2=priv) keys.
 *
 */
CK_RV
meta_generate_keys(meta_session_t *session, CK_MECHANISM *pMechanism,
	CK_ATTRIBUTE *k1Template, CK_ULONG k1AttrCount, meta_object_t *key1,
	CK_ATTRIBUTE *k2Template, CK_ULONG k2AttrCount, meta_object_t *key2)
{
	CK_RV rv, save_rv;
	slot_session_t *gen_session = NULL;
	slot_object_t *slot_key1 = NULL, *slot_key2 = NULL;
	mechinfo_t **slots = NULL;
	unsigned long i, slotCount = 0;
	boolean_t doKeyPair = B_FALSE, token_only = B_FALSE;
	CK_ULONG slotnum;

	(void) get_template_boolean(CKA_TOKEN, k1Template, k1AttrCount,
	    &(key1->isToken));
	if (key2) {
		(void) get_template_boolean(CKA_TOKEN, k2Template, k2AttrCount,
		    &(key2->isToken));
		doKeyPair = B_TRUE;
	}

	/* Can't create token objects in a read-only session. */
	if ((IS_READ_ONLY_SESSION(session->session_flags)) &&
	    ((key1->isToken) || ((key2) && (key2->isToken)))) {
		return (CKR_SESSION_READ_ONLY);
	}

	if ((key1->isToken) || ((doKeyPair) && (key2->isToken))) {
		/*
		 * Token objects can only be generated in the token object
		 * slot.  If token object slot doesn't support generating
		 * the key, it will just not be done
		 */
		token_only = B_TRUE;
	}

	rv = get_slotlist_for_mech(pMechanism->mechanism,
	    &(session->mech_support_info), &slots, &slotCount, token_only);

	if (rv != CKR_OK) {
		goto finish;
	}

	rv = meta_slot_object_alloc(&slot_key1);
	if (doKeyPair && rv == CKR_OK)
		rv = meta_slot_object_alloc(&slot_key2);
	if (rv != CKR_OK)
		goto finish;

	/* Attempt to generate key on slots until one succeeds. */
	for (i = 0; i < slotCount; i++) {
		CK_SESSION_HANDLE hSession;
		CK_SLOT_ID fw_st_id;

		gen_session = NULL;

		slotnum = slots[i]->slotnum;

		if (session->op1.session != NULL) {
			if ((session->op1.session)->slotnum == slotnum) {
				gen_session = session->op1.session;
				/*
				 * set it to NULL for now, assign it to
				 * gen_session again if it is successful
				 */
				session->op1.session = NULL;
			} else {
				gen_session = NULL;
			}
		}

		if (gen_session == NULL) {
			rv = meta_get_slot_session(slotnum, &gen_session,
			    session->session_flags);
			if (rv != CKR_OK) {
				goto loop_cleanup;
			}
		}

		fw_st_id = gen_session->fw_st_id;
		hSession = gen_session->hSession;
		if (doKeyPair) {
			rv = FUNCLIST(fw_st_id)->C_GenerateKeyPair(hSession,
			    pMechanism, k1Template, k1AttrCount,
			    k2Template, k2AttrCount,
			    &slot_key1->hObject, &slot_key2->hObject);
		} else {
			rv = FUNCLIST(fw_st_id)->C_GenerateKey(hSession,
			    pMechanism, k1Template, k1AttrCount,
			    &slot_key1->hObject);
		}

		if (rv == CKR_OK)
			break;

loop_cleanup:
		if (i == 0) {
			save_rv = rv;
		}

		if (gen_session) {
			meta_release_slot_session(gen_session);
			gen_session = NULL;
		}
	}
	if (rv != CKR_OK) {
		rv = save_rv;
		goto finish;
	}


	rv = meta_object_get_attr(gen_session, slot_key1->hObject, key1);
	if (rv != CKR_OK) {
		goto finish;
	}

	if (key2) {
		rv = meta_object_get_attr(gen_session, slot_key2->hObject,
		    key2);
		if (rv != CKR_OK) {
			goto finish;
		}
	}

	meta_slot_object_activate(slot_key1, gen_session, key1->isToken);
	key1->clones[slotnum] = slot_key1;
	key1->master_clone_slotnum = slotnum;
	slot_key1 = NULL;

	if (doKeyPair) {
		meta_slot_object_activate(slot_key2, gen_session,
			key2->isToken);
		key2->clones[slotnum] = slot_key2;
		key2->master_clone_slotnum = slotnum;
		slot_key2 = NULL;
	}

finish:
	if (slot_key1) {
		meta_slot_object_dealloc(slot_key1);
	}

	if (slot_key2) {
		meta_slot_object_dealloc(slot_key2);
	}

	/* Save the session in case it can be used later */
	if (rv == CKR_OK) {
		/*
		 * If currently stored session is not the one being in use now,
		 * release the previous one and store the current one
		 */
		if ((session->op1.session) &&
		    (session->op1.session != gen_session)) {
			meta_release_slot_session(session->op1.session);
		}

		/* Save the session */
		session->op1.session = gen_session;
	}

	return (rv);
}


/*
 * meta_wrap_key
 *
 */
CK_RV
meta_wrap_key(meta_session_t *session, CK_MECHANISM *pMechanism,
    meta_object_t *wrappingkey, meta_object_t *inputkey, CK_BYTE *wrapped_key,
    CK_ULONG *wrapped_key_len)
{
	CK_RV rv, save_rv;
	slot_session_t *wrap_session = NULL;
	slot_object_t *slot_wrappingkey, *slot_inputkey;
	mechinfo_t **slots = NULL;
	unsigned long i, slotCount = 0;
	CK_ULONG slotnum;

	/*
	 * If the key to be wrapped is a token object,
	 * the operation can only be done in the token object slot.
	 */
	rv = get_slotlist_for_mech(pMechanism->mechanism,
	    &(session->mech_support_info), &slots, &slotCount,
	    inputkey->isToken);

	if (rv != CKR_OK) {
		return (rv);
	}

	/* Attempt to wrap key on slots until one succeeds. */
	for (i = 0; i < slotCount; i++) {

		slotnum = slots[i]->slotnum;
		wrap_session = NULL;

		if (session->op1.session != NULL) {
			if ((session->op1.session)->slotnum == slotnum) {
				wrap_session = session->op1.session;
				/*
				 * set it to NULL for now, assign it to
				 * wrap_session again if it is successful
				 */
				session->op1.session = NULL;
			} else {
				wrap_session = NULL;
			}
		}

		if (wrap_session == NULL) {
			rv = meta_get_slot_session(slotnum, &wrap_session,
			    session->session_flags);
			if (rv != CKR_OK) {
				goto loop_cleanup;
			}
		}

		rv = meta_object_get_clone(wrappingkey, slotnum,
		    wrap_session, &slot_wrappingkey);
		if (rv != CKR_OK)
			goto loop_cleanup;

		rv = meta_object_get_clone(inputkey, slotnum,
		    wrap_session, &slot_inputkey);
		if (rv != CKR_OK)
			goto loop_cleanup;

		rv = FUNCLIST(wrap_session->fw_st_id)->C_WrapKey(
		    wrap_session->hSession, pMechanism,
		    slot_wrappingkey->hObject, slot_inputkey->hObject,
		    wrapped_key, wrapped_key_len);

		if (rv == CKR_OK || rv == CKR_BUFFER_TOO_SMALL)
			break;

loop_cleanup:
		if (i == 0) {
			save_rv = rv;
		}

		if (wrap_session) {
			meta_release_slot_session(wrap_session);
			wrap_session = NULL;
		}
	}
	if (rv != CKR_OK) {
		if (rv != CKR_BUFFER_TOO_SMALL) {
			if (i == slotCount) {
				rv = save_rv;
			}
		}
	}

finish:
	/* Save the session in case it can be used later */
	if (rv == CKR_OK) {
		/*
		 * If currently stored session is not the one being in use now,
		 * release the previous one and store the current one
		 */
		if ((session->op1.session) &&
		    (session->op1.session != wrap_session)) {
			meta_release_slot_session(session->op1.session);
		}

		/* Save the session */
		session->op1.session = wrap_session;
	}
	return (rv);
}


/*
 * meta_unwrap_key
 *
 */
CK_RV
meta_unwrap_key(meta_session_t *session,
	CK_MECHANISM *pMechanism, meta_object_t *unwrapping_key,
	CK_BYTE *wrapped_key, CK_ULONG wrapped_key_len,
	CK_ATTRIBUTE *template, CK_ULONG template_size,
	meta_object_t *unwrapped_key)
{
	CK_RV rv, save_rv;
	CK_OBJECT_HANDLE hUnwrappedKey;
	slot_session_t *unwrap_session = NULL;
	slot_object_t *slot_unwrappingkey, *slot_unwrapped_key;
	mechinfo_t **slots = NULL;
	unsigned long i, slotCount = 0;
	CK_ULONG slotnum;

	/* Can't create token objects in a read-only session. */
	if ((IS_READ_ONLY_SESSION(session->session_flags)) &&
	    unwrapped_key->isToken) {
		return (CKR_SESSION_READ_ONLY);
	}

	/*
	 * If the the resulting unwrapped key
	 * needs to be a token object, the operation can only
	 * be performed in the token slot, if it is supported.
	 */
	rv = get_slotlist_for_mech(pMechanism->mechanism,
	    &(session->mech_support_info), &slots, &slotCount,
	    unwrapped_key->isToken);

	if (rv != CKR_OK) {
		return (rv);
	}

	rv = meta_slot_object_alloc(&slot_unwrapped_key);
	if (rv != CKR_OK) {
		goto finish;
	}

	/* Attempt to unwrap key on slots until one succeeds. */
	for (i = 0; i < slotCount; i++) {

		slotnum = slots[i]->slotnum;
		unwrap_session = NULL;

		if (session->op1.session != NULL) {
			if ((session->op1.session)->slotnum == slotnum) {
				unwrap_session = session->op1.session;
				/*
				 * set it to NULL for now, assign it to
				 * unwrap_session again if it is successful
				 */
				session->op1.session = NULL;
			} else {
				unwrap_session = NULL;
			}
		}

		if (unwrap_session == NULL) {
			rv = meta_get_slot_session(slotnum, &unwrap_session,
			    session->session_flags);
			if (rv != CKR_OK) {
				goto loop_cleanup;
			}
		}

		rv = meta_object_get_clone(unwrapping_key, slotnum,
		    unwrap_session, &slot_unwrappingkey);
		if (rv != CKR_OK)
			goto loop_cleanup;

		rv = FUNCLIST(unwrap_session->fw_st_id)->C_UnwrapKey(
		    unwrap_session->hSession, pMechanism,
		    slot_unwrappingkey->hObject, wrapped_key, wrapped_key_len,
		    template, template_size, &hUnwrappedKey);

		if (rv == CKR_OK || rv == CKR_BUFFER_TOO_SMALL)
			break;
loop_cleanup:
		if (i == 0) {
			save_rv = rv;
		}

		if (unwrap_session) {
			meta_release_slot_session(unwrap_session);
			unwrap_session = NULL;
		}
	}


	if (rv != CKR_OK) {
		if (rv != CKR_BUFFER_TOO_SMALL) {
			rv = save_rv;
		}
		goto finish;
	}


	slot_unwrapped_key->hObject = hUnwrappedKey;
	unwrapped_key->clones[slotnum] = slot_unwrapped_key;
	unwrapped_key->master_clone_slotnum = slotnum;
	rv = meta_object_get_attr(unwrap_session,
	    slot_unwrapped_key->hObject, unwrapped_key);
	if (rv != CKR_OK) {
		goto finish;
	}
	meta_slot_object_activate(slot_unwrapped_key, unwrap_session,
	    unwrapped_key->isToken);
	slot_unwrapped_key = NULL;

finish:
	if (slot_unwrapped_key) {
		meta_slot_object_dealloc(slot_unwrapped_key);
	}

	/* Save the session in case it can be used later */
	if (rv == CKR_OK) {
		/*
		 * If currently stored session is not the one being in use now,
		 * release the previous one and store the current one
		 */
		if ((session->op1.session) &&
		    (session->op1.session != unwrap_session)) {
			meta_release_slot_session(session->op1.session);
		}

		/* Save the session */
		session->op1.session = unwrap_session;
	}

	return (rv);
}


/*
 * meta_derive_key
 *
 * Core implementation for C_DeriveKey. This function is a bit gross because
 * of PKCS#11 kludges that pass extra object handles in the mechanism
 * parameters. Normally C_DeriveKey takes a single existing key as input,
 * and creates a single new key as output. But a few mechanisms take 2 keys
 * as input, and the two SSL/TLS mechanisms create 4 keys as output.
 *
 * When an extra input key (basekey2) is set, we set *phBaseKey2 to the clone's
 * object handle. phBaseKey2 is provided by the caller so we don't have to
 * trudge down into different mechanism parameters to set it when issuing the
 * operation.
 *
 * For the SSL/TLS mechanisms, newKey2/newKey3/newKey4 will be set. We pull
 * the new handles from pMech->pParameter in order to fill in the appropriate
 * meta_object fields.
 */
CK_RV
meta_derive_key(meta_session_t *session, CK_MECHANISM *pMechanism,
	meta_object_t *basekey1, meta_object_t *basekey2,
	CK_OBJECT_HANDLE *phBaseKey2,
	CK_ATTRIBUTE *pTemplate, CK_ULONG ulAttributeCount,
	meta_object_t *newKey1, meta_object_t *newKey2,
	meta_object_t *newKey3, meta_object_t *newKey4)
{
	CK_RV rv, save_rv;
	CK_OBJECT_HANDLE hDerivedKey;

	CK_ULONG slotnum;
	boolean_t isSSL = B_FALSE;
	mechinfo_t **slots = NULL;
	unsigned long i, slot_count = 0;
	slot_session_t *derive_session = NULL;
	slot_object_t *slot_basekey1 = NULL, *slot_basekey2 = NULL;
	slot_object_t *slotkey1 = NULL, *slotkey2 = NULL,
		*slotkey3 = NULL, *slotkey4 = NULL;


	/*
	 * if the derived key needs to be a token object, can only
	 * perform the derive operation in the token slot
	 */
	(void) get_template_boolean(CKA_TOKEN, pTemplate, ulAttributeCount,
	    &(newKey1->isToken));

	/* Can't create token objects in a read-only session. */
	if ((IS_READ_ONLY_SESSION(session->session_flags)) &&
	    newKey1->isToken) {
		rv = CKR_SESSION_READ_ONLY;
		goto finish;
	}

	rv = get_slotlist_for_mech(pMechanism->mechanism,
	    &(session->mech_support_info), &slots, &slot_count,
	    newKey1->isToken);

	if (rv != CKR_OK) {
		return (rv);
	}

	if (pMechanism->mechanism == CKM_SSL3_KEY_AND_MAC_DERIVE ||
	    pMechanism->mechanism == CKM_TLS_KEY_AND_MAC_DERIVE) {
		isSSL = B_TRUE;
	}

	rv = meta_slot_object_alloc(&slotkey1);
	if (isSSL) {
		if (rv == CKR_OK)
			rv = meta_slot_object_alloc(&slotkey2);
		if (rv == CKR_OK)
			rv = meta_slot_object_alloc(&slotkey3);
		if (rv == CKR_OK)
			rv = meta_slot_object_alloc(&slotkey4);
	}
	if (rv != CKR_OK) {
		goto finish;
	}

	for (i = 0; i < slot_count; i++) {
		slotnum = slots[i]->slotnum;

		derive_session = NULL;

		if (session->op1.session != NULL) {
			if ((session->op1.session)->slotnum == slotnum) {
				derive_session = session->op1.session;
				/*
				 * set it to NULL for now, assign it to
				 * derive_session again if it is successful
				 */
				session->op1.session = NULL;
			} else {
				derive_session = NULL;
			}
		}

		if (derive_session == NULL) {
			rv = meta_get_slot_session(slotnum, &derive_session,
			    session->session_flags);
			if (rv != CKR_OK) {
				goto loop_cleanup;
			}
		}

		rv = meta_object_get_clone(basekey1, slotnum,
		    derive_session, &slot_basekey1);
		if (rv != CKR_OK)
			goto loop_cleanup;

		if (basekey2) {
			rv = meta_object_get_clone(basekey2, slotnum,
			    derive_session, &slot_basekey2);
			if (rv != CKR_OK)
				goto loop_cleanup;

			/* Pass the handle somewhere in the mech params. */
			*phBaseKey2 = slot_basekey2->hObject;
		}

		rv = FUNCLIST(derive_session->fw_st_id)->C_DeriveKey(
		    derive_session->hSession, pMechanism,
		    slot_basekey1->hObject, pTemplate, ulAttributeCount,
		    isSSL ? NULL : &hDerivedKey);

		if (rv == CKR_OK)
			break;
loop_cleanup:
		if (i == 0) {
			save_rv = rv;
		}

		if (derive_session) {
			meta_release_slot_session(derive_session);
			derive_session = NULL;
		}
		/* No need to cleanup clones, so we can reuse them later. */
	}

	if (rv != CKR_OK) {
		rv = save_rv;
		goto finish;
	}

	/*
	 * These SSL/TLS are unique in that the parameter in the API for
	 * the new key is unused (NULL). Instead, there are 4 keys which
	 * are derived, and are passed back through the mechanism params.
	 * Both mechs use the same mechanism parameter type.
	 */
	if (isSSL) {
		CK_SSL3_KEY_MAT_PARAMS *keyparams;
		CK_SSL3_KEY_MAT_OUT *keys;

		/* NULL checks already done by caller */
		keyparams = (CK_SSL3_KEY_MAT_PARAMS*)pMechanism->pParameter;
		keys = keyparams->pReturnedKeyMaterial;

		slotkey1->hObject = keys->hClientMacSecret;
		slotkey2->hObject = keys->hServerMacSecret;
		slotkey3->hObject = keys->hClientKey;
		slotkey4->hObject = keys->hServerKey;

		rv = meta_object_get_attr(derive_session,
		    slotkey1->hObject, newKey1);
		if (rv != CKR_OK) {
			goto finish;
		}

		rv = meta_object_get_attr(derive_session,
		    slotkey2->hObject, newKey2);
		if (rv != CKR_OK) {
			goto finish;
		}

		rv = meta_object_get_attr(derive_session,
		    slotkey3->hObject, newKey3);
		if (rv != CKR_OK) {
			goto finish;
		}

		rv = meta_object_get_attr(derive_session,
		    slotkey4->hObject, newKey4);
		if (rv != CKR_OK) {
			goto finish;
		}

		newKey1->clones[slotnum] = slotkey1;
		newKey2->clones[slotnum] = slotkey2;
		newKey3->clones[slotnum] = slotkey3;
		newKey4->clones[slotnum] = slotkey4;

		newKey1->master_clone_slotnum = slotnum;
		newKey2->master_clone_slotnum = slotnum;
		newKey3->master_clone_slotnum = slotnum;
		newKey4->master_clone_slotnum = slotnum;

		meta_slot_object_activate(slotkey1, derive_session,
			newKey1->isToken);
		slotkey1 = NULL;
		meta_slot_object_activate(slotkey2, derive_session,
			newKey2->isToken);
		slotkey2 = NULL;
		meta_slot_object_activate(slotkey3, derive_session,
			newKey3->isToken);
		slotkey3 = NULL;
		meta_slot_object_activate(slotkey4, derive_session,
				newKey4->isToken);
		slotkey4 = NULL;

	} else {
		slotkey1->hObject = hDerivedKey;
		newKey1->clones[slotnum] = slotkey1;
		newKey1->master_clone_slotnum = slotnum;

		rv = meta_object_get_attr(derive_session,
		    slotkey1->hObject, newKey1);
		if (rv != CKR_OK) {
			goto finish;
		}
		meta_slot_object_activate(slotkey1, derive_session,
			newKey1->isToken);
		slotkey1 = NULL;
	}


finish:
	if (slotkey1) {
		meta_slot_object_dealloc(slotkey1);
	}
	if (slotkey2) {
		meta_slot_object_dealloc(slotkey2);
	}
	if (slotkey3) {
		meta_slot_object_dealloc(slotkey3);
	}
	if (slotkey4) {
		meta_slot_object_dealloc(slotkey4);
	}

	/* Save the session in case it can be used later */
	if (rv == CKR_OK) {
		/*
		 * If currently stored session is not the one being in use now,
		 * release the previous one and store the current one
		 */
		if ((session->op1.session) &&
		    (session->op1.session != derive_session)) {
			meta_release_slot_session(session->op1.session);
		}

		/* Save the session */
		session->op1.session = derive_session;
	}

	return (rv);
}


/*
 * Check the following 4 environment variables for user/application's
 * configuration for metaslot.  User's configuration takes precedence
 * over the system wide configuration for metaslot
 *
 * ${METASLOT_ENABLED}
 * ${METASLOT_OBJECTSTORE_SLOT}
 * ${METASLOT_OBJECTSTORE_TOKEN}
 * ${METASLOT_AUTO_KEY_MIGRATE}
 *
 * values defined in these environment variables will be stored in the
 * global variable "metaslot_config"
 */
void
get_user_metaslot_config()
{
	char *env_val = NULL;

	/*
	 * Check to see if any environment variable is defined
	 * by the user for configuring metaslot.
	 */
	bzero(&metaslot_config, sizeof (metaslot_config));

	/* METASLOT_ENABLED */
	env_val = getenv("METASLOT_ENABLED");
	if (env_val) {
		metaslot_config.enabled_specified = B_TRUE;
		if (strcasecmp(env_val, TRUE_STRING) == 0) {
			metaslot_config.enabled = B_TRUE;
		} else if (strcasecmp(env_val, FALSE_STRING) == 0) {
			metaslot_config.enabled = B_FALSE;
		} else {
			/* value is neither 1 or 0, ignore this value */
			metaslot_config.enabled_specified = B_FALSE;
		}
	}

	/* METASLOT_AUTO_KEY_MIGRATE */
	env_val = getenv("METASLOT_AUTO_KEY_MIGRATE");
	if (env_val) {
		metaslot_config.auto_key_migrate_specified = B_TRUE;
		if (strcasecmp(env_val, TRUE_STRING) == 0) {
			metaslot_config.auto_key_migrate = B_TRUE;
		} else if (strcasecmp(env_val, FALSE_STRING) == 0) {
			metaslot_config.auto_key_migrate = B_FALSE;
		} else {
			/* value is neither 1 or 0, ignore this value */
			metaslot_config.auto_key_migrate_specified = B_FALSE;
		}
	}

	/* METASLOT_OBJECTSTORE_SLOT */
	env_val = getenv("METASLOT_OBJECTSTORE_SLOT");
	if (env_val) {
		metaslot_config.keystore_slot_specified = B_TRUE;
		(void) strlcpy((char *)metaslot_config.keystore_slot, env_val,
		    SLOT_DESCRIPTION_SIZE);
	}

	/* METASLOT_OBJECTSTORE_TOKEN */
	env_val = getenv("METASLOT_OBJECTSTORE_TOKEN");
	if (env_val) {
		metaslot_config.keystore_token_specified = B_TRUE;
		(void) strlcpy((char *)metaslot_config.keystore_token, env_val,
		    TOKEN_LABEL_SIZE);
	}
}