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/*
* This file and its contents are supplied under the terms of the
* Common Development and Distribution License ("CDDL"), version 1.0.
* You may only use this file in accordance with the terms of version
* 1.0 of the CDDL.
*
* A full copy of the text of the CDDL should have accompanied this
* source. A copy of the CDDL is also available via the Internet at
* http://www.illumos.org/license/CDDL.
*/
/*
* Copyright 2017 Nexenta Systems, Inc. All rights reserved.
*/
/*
* Helper functions for SMB signing using PKCS#11
*
* There are two implementations of these functions:
* This one (for user space) and another for kernel.
* See: uts/common/fs/smbclnt/netsmb/smb_sign_kcf.c
*/
#include <stdlib.h>
#include <strings.h>
#include <sys/cmn_err.h>
#include <netsmb/smb_signing.h>
#include <security/cryptoki.h>
#include <security/pkcs11.h>
/*
* Common function to see if a mech is available.
*/
static int
find_mech(smb_sign_mech_t *mech, ulong_t mid)
{
CK_SESSION_HANDLE hdl;
CK_RV rv;
rv = SUNW_C_GetMechSession(mid, &hdl);
if (rv != CKR_OK) {
cmn_err(CE_NOTE, "PKCS#11: no mech 0x%x",
(unsigned int)mid);
return (-1);
}
(void) C_CloseSession(hdl);
mech->mechanism = mid;
mech->pParameter = NULL;
mech->ulParameterLen = 0;
return (0);
}
/*
* SMB1 signing helpers:
* (getmech, init, update, final)
*/
/*
* Find out if we have this mech.
*/
int
smb_md5_getmech(smb_sign_mech_t *mech)
{
return (find_mech(mech, CKM_MD5));
}
/*
* Start PKCS#11 session.
*/
int
smb_md5_init(smb_sign_ctx_t *ctxp, smb_sign_mech_t *mech)
{
CK_RV rv;
rv = SUNW_C_GetMechSession(mech->mechanism, ctxp);
if (rv != CKR_OK)
return (-1);
rv = C_DigestInit(*ctxp, mech);
return (rv == CKR_OK ? 0 : -1);
}
/*
* Digest one segment
*/
int
smb_md5_update(smb_sign_ctx_t ctx, void *buf, size_t len)
{
CK_RV rv;
rv = C_DigestUpdate(ctx, buf, len);
if (rv != CKR_OK)
(void) C_CloseSession(ctx);
return (rv == CKR_OK ? 0 : -1);
}
/*
* Get the final digest.
*/
int
smb_md5_final(smb_sign_ctx_t ctx, uint8_t *digest16)
{
CK_ULONG len = MD5_DIGEST_LENGTH;
CK_RV rv;
rv = C_DigestFinal(ctx, digest16, &len);
(void) C_CloseSession(ctx);
return (rv == CKR_OK ? 0 : -1);
}
/*
* SMB2 signing helpers:
* (getmech, init, update, final)
*/
/*
* Find out if we have this mech.
*/
int
smb2_hmac_getmech(smb_sign_mech_t *mech)
{
return (find_mech(mech, CKM_SHA256_HMAC));
}
/*
* Start PKCS#11 session, load the key.
*/
int
smb2_hmac_init(smb_sign_ctx_t *ctxp, smb_sign_mech_t *mech,
uint8_t *key, size_t key_len)
{
CK_OBJECT_HANDLE hkey = 0;
CK_RV rv;
rv = SUNW_C_GetMechSession(mech->mechanism, ctxp);
if (rv != CKR_OK)
return (-1);
rv = SUNW_C_KeyToObject(*ctxp, mech->mechanism,
key, key_len, &hkey);
if (rv != CKR_OK)
return (-1);
rv = C_SignInit(*ctxp, mech, hkey);
(void) C_DestroyObject(*ctxp, hkey);
return (rv == CKR_OK ? 0 : -1);
}
/*
* Digest one segment
*/
int
smb2_hmac_update(smb_sign_ctx_t ctx, uint8_t *in, size_t len)
{
CK_RV rv;
rv = C_SignUpdate(ctx, in, len);
if (rv != CKR_OK)
(void) C_CloseSession(ctx);
return (rv == CKR_OK ? 0 : -1);
}
/*
* Note, the SMB2 signature is the first 16 bytes of the
* 32-byte SHA256 HMAC digest.
*/
int
smb2_hmac_final(smb_sign_ctx_t ctx, uint8_t *digest16)
{
uint8_t full_digest[SHA256_DIGEST_LENGTH];
CK_ULONG len = SHA256_DIGEST_LENGTH;
CK_RV rv;
rv = C_SignFinal(ctx, full_digest, &len);
if (rv == CKR_OK)
bcopy(full_digest, digest16, 16);
(void) C_CloseSession(ctx);
return (rv == CKR_OK ? 0 : -1);
}
/*
* SMB3 signing helpers:
* (getmech, init, update, final)
*/
/*
* Find out if we have this mech.
*/
int
smb3_cmac_getmech(smb_sign_mech_t *mech)
{
return (find_mech(mech, CKM_AES_CMAC));
}
/*
* Start PKCS#11 session, load the key.
*/
int
smb3_cmac_init(smb_sign_ctx_t *ctxp, smb_sign_mech_t *mech,
uint8_t *key, size_t key_len)
{
CK_OBJECT_HANDLE hkey = 0;
CK_RV rv;
rv = SUNW_C_GetMechSession(mech->mechanism, ctxp);
if (rv != CKR_OK)
return (-1);
rv = SUNW_C_KeyToObject(*ctxp, mech->mechanism,
key, key_len, &hkey);
if (rv != CKR_OK) {
(void) C_CloseSession(*ctxp);
return (-1);
}
rv = C_SignInit(*ctxp, mech, hkey);
(void) C_DestroyObject(*ctxp, hkey);
if (rv != CKR_OK) {
(void) C_CloseSession(*ctxp);
return (-1);
}
return (0);
}
/*
* Digest one segment
*/
int
smb3_cmac_update(smb_sign_ctx_t ctx, uint8_t *in, size_t len)
{
CK_RV rv;
rv = C_SignUpdate(ctx, in, len);
if (rv != CKR_OK)
(void) C_CloseSession(ctx);
return (rv == CKR_OK ? 0 : -1);
}
/*
* Note, the SMB2 signature is just the AES CMAC digest.
* (both are 16 bytes long)
*/
int
smb3_cmac_final(smb_sign_ctx_t ctx, uint8_t *digest)
{
CK_ULONG len = SMB2_SIG_SIZE;
CK_RV rv;
rv = C_SignFinal(ctx, digest, &len);
(void) C_CloseSession(ctx);
return (rv == CKR_OK ? 0 : -1);
}
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