1195 lines
30 KiB
C
1195 lines
30 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2016 Namjae Jeon <linkinjeon@kernel.org>
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* Copyright (C) 2018 Samsung Electronics Co., Ltd.
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*/
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#include <linux/kernel.h>
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#include <linux/fs.h>
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#include <linux/uaccess.h>
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#include <linux/backing-dev.h>
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#include <linux/writeback.h>
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#include <linux/uio.h>
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#include <linux/xattr.h>
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#include <crypto/hash.h>
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#include <crypto/aead.h>
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#include <linux/random.h>
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#include <linux/scatterlist.h>
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#include "auth.h"
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#include "glob.h"
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#include <linux/fips.h>
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#include <crypto/des.h>
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#include "server.h"
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#include "smb_common.h"
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#include "connection.h"
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#include "mgmt/user_session.h"
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#include "mgmt/user_config.h"
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#include "crypto_ctx.h"
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#include "transport_ipc.h"
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#include "../smbfs_common/arc4.h"
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/*
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* Fixed format data defining GSS header and fixed string
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* "not_defined_in_RFC4178@please_ignore".
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* So sec blob data in neg phase could be generated statically.
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*/
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static char NEGOTIATE_GSS_HEADER[AUTH_GSS_LENGTH] = {
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#ifdef CONFIG_SMB_SERVER_KERBEROS5
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0x60, 0x5e, 0x06, 0x06, 0x2b, 0x06, 0x01, 0x05,
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0x05, 0x02, 0xa0, 0x54, 0x30, 0x52, 0xa0, 0x24,
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0x30, 0x22, 0x06, 0x09, 0x2a, 0x86, 0x48, 0x86,
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0xf7, 0x12, 0x01, 0x02, 0x02, 0x06, 0x09, 0x2a,
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0x86, 0x48, 0x82, 0xf7, 0x12, 0x01, 0x02, 0x02,
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0x06, 0x0a, 0x2b, 0x06, 0x01, 0x04, 0x01, 0x82,
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0x37, 0x02, 0x02, 0x0a, 0xa3, 0x2a, 0x30, 0x28,
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0xa0, 0x26, 0x1b, 0x24, 0x6e, 0x6f, 0x74, 0x5f,
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0x64, 0x65, 0x66, 0x69, 0x6e, 0x65, 0x64, 0x5f,
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0x69, 0x6e, 0x5f, 0x52, 0x46, 0x43, 0x34, 0x31,
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0x37, 0x38, 0x40, 0x70, 0x6c, 0x65, 0x61, 0x73,
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0x65, 0x5f, 0x69, 0x67, 0x6e, 0x6f, 0x72, 0x65
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#else
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0x60, 0x48, 0x06, 0x06, 0x2b, 0x06, 0x01, 0x05,
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0x05, 0x02, 0xa0, 0x3e, 0x30, 0x3c, 0xa0, 0x0e,
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0x30, 0x0c, 0x06, 0x0a, 0x2b, 0x06, 0x01, 0x04,
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0x01, 0x82, 0x37, 0x02, 0x02, 0x0a, 0xa3, 0x2a,
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0x30, 0x28, 0xa0, 0x26, 0x1b, 0x24, 0x6e, 0x6f,
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0x74, 0x5f, 0x64, 0x65, 0x66, 0x69, 0x6e, 0x65,
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0x64, 0x5f, 0x69, 0x6e, 0x5f, 0x52, 0x46, 0x43,
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0x34, 0x31, 0x37, 0x38, 0x40, 0x70, 0x6c, 0x65,
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0x61, 0x73, 0x65, 0x5f, 0x69, 0x67, 0x6e, 0x6f,
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0x72, 0x65
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#endif
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};
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void ksmbd_copy_gss_neg_header(void *buf)
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{
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memcpy(buf, NEGOTIATE_GSS_HEADER, AUTH_GSS_LENGTH);
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}
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/**
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* ksmbd_gen_sess_key() - function to generate session key
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* @sess: session of connection
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* @hash: source hash value to be used for find session key
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* @hmac: source hmac value to be used for finding session key
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*
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*/
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static int ksmbd_gen_sess_key(struct ksmbd_session *sess, char *hash,
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char *hmac)
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{
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struct ksmbd_crypto_ctx *ctx;
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int rc;
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ctx = ksmbd_crypto_ctx_find_hmacmd5();
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if (!ctx) {
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ksmbd_debug(AUTH, "could not crypto alloc hmacmd5\n");
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return -ENOMEM;
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}
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rc = crypto_shash_setkey(CRYPTO_HMACMD5_TFM(ctx),
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hash,
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CIFS_HMAC_MD5_HASH_SIZE);
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if (rc) {
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ksmbd_debug(AUTH, "hmacmd5 set key fail error %d\n", rc);
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goto out;
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}
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rc = crypto_shash_init(CRYPTO_HMACMD5(ctx));
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if (rc) {
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ksmbd_debug(AUTH, "could not init hmacmd5 error %d\n", rc);
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goto out;
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}
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rc = crypto_shash_update(CRYPTO_HMACMD5(ctx),
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hmac,
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SMB2_NTLMV2_SESSKEY_SIZE);
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if (rc) {
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ksmbd_debug(AUTH, "Could not update with response error %d\n", rc);
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goto out;
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}
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rc = crypto_shash_final(CRYPTO_HMACMD5(ctx), sess->sess_key);
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if (rc) {
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ksmbd_debug(AUTH, "Could not generate hmacmd5 hash error %d\n", rc);
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goto out;
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}
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out:
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ksmbd_release_crypto_ctx(ctx);
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return rc;
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}
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static int calc_ntlmv2_hash(struct ksmbd_conn *conn, struct ksmbd_session *sess,
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char *ntlmv2_hash, char *dname)
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{
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int ret, len, conv_len;
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wchar_t *domain = NULL;
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__le16 *uniname = NULL;
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struct ksmbd_crypto_ctx *ctx;
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ctx = ksmbd_crypto_ctx_find_hmacmd5();
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if (!ctx) {
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ksmbd_debug(AUTH, "can't generate ntlmv2 hash\n");
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return -ENOMEM;
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}
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ret = crypto_shash_setkey(CRYPTO_HMACMD5_TFM(ctx),
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user_passkey(sess->user),
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CIFS_ENCPWD_SIZE);
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if (ret) {
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ksmbd_debug(AUTH, "Could not set NT Hash as a key\n");
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goto out;
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}
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ret = crypto_shash_init(CRYPTO_HMACMD5(ctx));
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if (ret) {
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ksmbd_debug(AUTH, "could not init hmacmd5\n");
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goto out;
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}
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/* convert user_name to unicode */
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len = strlen(user_name(sess->user));
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uniname = kzalloc(2 + UNICODE_LEN(len), GFP_KERNEL);
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if (!uniname) {
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ret = -ENOMEM;
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goto out;
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}
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conv_len = smb_strtoUTF16(uniname, user_name(sess->user), len,
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conn->local_nls);
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if (conv_len < 0 || conv_len > len) {
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ret = -EINVAL;
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goto out;
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}
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UniStrupr(uniname);
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ret = crypto_shash_update(CRYPTO_HMACMD5(ctx),
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(char *)uniname,
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UNICODE_LEN(conv_len));
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if (ret) {
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ksmbd_debug(AUTH, "Could not update with user\n");
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goto out;
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}
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/* Convert domain name or conn name to unicode and uppercase */
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len = strlen(dname);
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domain = kzalloc(2 + UNICODE_LEN(len), GFP_KERNEL);
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if (!domain) {
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ret = -ENOMEM;
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goto out;
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}
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conv_len = smb_strtoUTF16((__le16 *)domain, dname, len,
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conn->local_nls);
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if (conv_len < 0 || conv_len > len) {
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ret = -EINVAL;
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goto out;
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}
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ret = crypto_shash_update(CRYPTO_HMACMD5(ctx),
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(char *)domain,
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UNICODE_LEN(conv_len));
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if (ret) {
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ksmbd_debug(AUTH, "Could not update with domain\n");
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goto out;
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}
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ret = crypto_shash_final(CRYPTO_HMACMD5(ctx), ntlmv2_hash);
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if (ret)
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ksmbd_debug(AUTH, "Could not generate md5 hash\n");
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out:
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kfree(uniname);
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kfree(domain);
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ksmbd_release_crypto_ctx(ctx);
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return ret;
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}
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/**
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* ksmbd_auth_ntlmv2() - NTLMv2 authentication handler
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* @sess: session of connection
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* @ntlmv2: NTLMv2 challenge response
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* @blen: NTLMv2 blob length
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* @domain_name: domain name
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*
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* Return: 0 on success, error number on error
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*/
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int ksmbd_auth_ntlmv2(struct ksmbd_conn *conn, struct ksmbd_session *sess,
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struct ntlmv2_resp *ntlmv2, int blen, char *domain_name,
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char *cryptkey)
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{
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char ntlmv2_hash[CIFS_ENCPWD_SIZE];
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char ntlmv2_rsp[CIFS_HMAC_MD5_HASH_SIZE];
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struct ksmbd_crypto_ctx *ctx;
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char *construct = NULL;
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int rc, len;
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ctx = ksmbd_crypto_ctx_find_hmacmd5();
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if (!ctx) {
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ksmbd_debug(AUTH, "could not crypto alloc hmacmd5\n");
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return -ENOMEM;
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}
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rc = calc_ntlmv2_hash(conn, sess, ntlmv2_hash, domain_name);
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if (rc) {
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ksmbd_debug(AUTH, "could not get v2 hash rc %d\n", rc);
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goto out;
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}
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rc = crypto_shash_setkey(CRYPTO_HMACMD5_TFM(ctx),
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ntlmv2_hash,
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CIFS_HMAC_MD5_HASH_SIZE);
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if (rc) {
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ksmbd_debug(AUTH, "Could not set NTLMV2 Hash as a key\n");
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goto out;
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}
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rc = crypto_shash_init(CRYPTO_HMACMD5(ctx));
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if (rc) {
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ksmbd_debug(AUTH, "Could not init hmacmd5\n");
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goto out;
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}
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len = CIFS_CRYPTO_KEY_SIZE + blen;
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construct = kzalloc(len, GFP_KERNEL);
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if (!construct) {
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rc = -ENOMEM;
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goto out;
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}
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memcpy(construct, cryptkey, CIFS_CRYPTO_KEY_SIZE);
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memcpy(construct + CIFS_CRYPTO_KEY_SIZE, &ntlmv2->blob_signature, blen);
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rc = crypto_shash_update(CRYPTO_HMACMD5(ctx), construct, len);
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if (rc) {
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ksmbd_debug(AUTH, "Could not update with response\n");
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goto out;
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}
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rc = crypto_shash_final(CRYPTO_HMACMD5(ctx), ntlmv2_rsp);
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if (rc) {
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ksmbd_debug(AUTH, "Could not generate md5 hash\n");
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goto out;
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}
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rc = ksmbd_gen_sess_key(sess, ntlmv2_hash, ntlmv2_rsp);
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if (rc) {
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ksmbd_debug(AUTH, "Could not generate sess key\n");
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goto out;
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}
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if (memcmp(ntlmv2->ntlmv2_hash, ntlmv2_rsp, CIFS_HMAC_MD5_HASH_SIZE) != 0)
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rc = -EINVAL;
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out:
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ksmbd_release_crypto_ctx(ctx);
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kfree(construct);
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return rc;
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}
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/**
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* ksmbd_decode_ntlmssp_auth_blob() - helper function to construct
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* authenticate blob
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* @authblob: authenticate blob source pointer
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* @usr: user details
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* @sess: session of connection
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*
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* Return: 0 on success, error number on error
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*/
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int ksmbd_decode_ntlmssp_auth_blob(struct authenticate_message *authblob,
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int blob_len, struct ksmbd_conn *conn,
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struct ksmbd_session *sess)
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{
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char *domain_name;
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unsigned int nt_off, dn_off;
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unsigned short nt_len, dn_len;
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int ret;
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if (blob_len < sizeof(struct authenticate_message)) {
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ksmbd_debug(AUTH, "negotiate blob len %d too small\n",
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blob_len);
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return -EINVAL;
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}
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if (memcmp(authblob->Signature, "NTLMSSP", 8)) {
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ksmbd_debug(AUTH, "blob signature incorrect %s\n",
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authblob->Signature);
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return -EINVAL;
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}
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nt_off = le32_to_cpu(authblob->NtChallengeResponse.BufferOffset);
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nt_len = le16_to_cpu(authblob->NtChallengeResponse.Length);
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dn_off = le32_to_cpu(authblob->DomainName.BufferOffset);
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dn_len = le16_to_cpu(authblob->DomainName.Length);
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if (blob_len < (u64)dn_off + dn_len || blob_len < (u64)nt_off + nt_len)
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return -EINVAL;
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/* TODO : use domain name that imported from configuration file */
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domain_name = smb_strndup_from_utf16((const char *)authblob + dn_off,
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dn_len, true, conn->local_nls);
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if (IS_ERR(domain_name))
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return PTR_ERR(domain_name);
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/* process NTLMv2 authentication */
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ksmbd_debug(AUTH, "decode_ntlmssp_authenticate_blob dname%s\n",
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domain_name);
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ret = ksmbd_auth_ntlmv2(conn, sess,
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(struct ntlmv2_resp *)((char *)authblob + nt_off),
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nt_len - CIFS_ENCPWD_SIZE,
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domain_name, conn->ntlmssp.cryptkey);
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kfree(domain_name);
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/* The recovered secondary session key */
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if (conn->ntlmssp.client_flags & NTLMSSP_NEGOTIATE_KEY_XCH) {
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struct arc4_ctx *ctx_arc4;
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unsigned int sess_key_off, sess_key_len;
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sess_key_off = le32_to_cpu(authblob->SessionKey.BufferOffset);
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sess_key_len = le16_to_cpu(authblob->SessionKey.Length);
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if (blob_len < (u64)sess_key_off + sess_key_len)
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return -EINVAL;
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ctx_arc4 = kmalloc(sizeof(*ctx_arc4), GFP_KERNEL);
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if (!ctx_arc4)
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return -ENOMEM;
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cifs_arc4_setkey(ctx_arc4, sess->sess_key,
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SMB2_NTLMV2_SESSKEY_SIZE);
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cifs_arc4_crypt(ctx_arc4, sess->sess_key,
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(char *)authblob + sess_key_off, sess_key_len);
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kfree_sensitive(ctx_arc4);
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}
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return ret;
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}
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/**
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* ksmbd_decode_ntlmssp_neg_blob() - helper function to construct
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* negotiate blob
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* @negblob: negotiate blob source pointer
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* @rsp: response header pointer to be updated
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* @sess: session of connection
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*
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*/
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int ksmbd_decode_ntlmssp_neg_blob(struct negotiate_message *negblob,
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int blob_len, struct ksmbd_conn *conn)
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{
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if (blob_len < sizeof(struct negotiate_message)) {
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ksmbd_debug(AUTH, "negotiate blob len %d too small\n",
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blob_len);
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return -EINVAL;
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}
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if (memcmp(negblob->Signature, "NTLMSSP", 8)) {
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ksmbd_debug(AUTH, "blob signature incorrect %s\n",
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negblob->Signature);
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return -EINVAL;
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}
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conn->ntlmssp.client_flags = le32_to_cpu(negblob->NegotiateFlags);
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return 0;
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}
|
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|
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/**
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* ksmbd_build_ntlmssp_challenge_blob() - helper function to construct
|
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* challenge blob
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* @chgblob: challenge blob source pointer to initialize
|
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* @rsp: response header pointer to be updated
|
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* @sess: session of connection
|
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*
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*/
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unsigned int
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ksmbd_build_ntlmssp_challenge_blob(struct challenge_message *chgblob,
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struct ksmbd_conn *conn)
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{
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struct target_info *tinfo;
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wchar_t *name;
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__u8 *target_name;
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unsigned int flags, blob_off, blob_len, type, target_info_len = 0;
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int len, uni_len, conv_len;
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int cflags = conn->ntlmssp.client_flags;
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memcpy(chgblob->Signature, NTLMSSP_SIGNATURE, 8);
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chgblob->MessageType = NtLmChallenge;
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flags = NTLMSSP_NEGOTIATE_UNICODE |
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NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_TARGET_TYPE_SERVER |
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NTLMSSP_NEGOTIATE_TARGET_INFO;
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if (cflags & NTLMSSP_NEGOTIATE_SIGN) {
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flags |= NTLMSSP_NEGOTIATE_SIGN;
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flags |= cflags & (NTLMSSP_NEGOTIATE_128 |
|
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NTLMSSP_NEGOTIATE_56);
|
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}
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if (cflags & NTLMSSP_NEGOTIATE_ALWAYS_SIGN)
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flags |= NTLMSSP_NEGOTIATE_ALWAYS_SIGN;
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|
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if (cflags & NTLMSSP_REQUEST_TARGET)
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flags |= NTLMSSP_REQUEST_TARGET;
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|
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if (conn->use_spnego &&
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(cflags & NTLMSSP_NEGOTIATE_EXTENDED_SEC))
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flags |= NTLMSSP_NEGOTIATE_EXTENDED_SEC;
|
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|
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if (cflags & NTLMSSP_NEGOTIATE_KEY_XCH)
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flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
|
|
|
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chgblob->NegotiateFlags = cpu_to_le32(flags);
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len = strlen(ksmbd_netbios_name());
|
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name = kmalloc(2 + UNICODE_LEN(len), GFP_KERNEL);
|
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if (!name)
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return -ENOMEM;
|
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|
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conv_len = smb_strtoUTF16((__le16 *)name, ksmbd_netbios_name(), len,
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conn->local_nls);
|
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if (conv_len < 0 || conv_len > len) {
|
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kfree(name);
|
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return -EINVAL;
|
|
}
|
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|
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uni_len = UNICODE_LEN(conv_len);
|
|
|
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blob_off = sizeof(struct challenge_message);
|
|
blob_len = blob_off + uni_len;
|
|
|
|
chgblob->TargetName.Length = cpu_to_le16(uni_len);
|
|
chgblob->TargetName.MaximumLength = cpu_to_le16(uni_len);
|
|
chgblob->TargetName.BufferOffset = cpu_to_le32(blob_off);
|
|
|
|
/* Initialize random conn challenge */
|
|
get_random_bytes(conn->ntlmssp.cryptkey, sizeof(__u64));
|
|
memcpy(chgblob->Challenge, conn->ntlmssp.cryptkey,
|
|
CIFS_CRYPTO_KEY_SIZE);
|
|
|
|
/* Add Target Information to security buffer */
|
|
chgblob->TargetInfoArray.BufferOffset = cpu_to_le32(blob_len);
|
|
|
|
target_name = (__u8 *)chgblob + blob_off;
|
|
memcpy(target_name, name, uni_len);
|
|
tinfo = (struct target_info *)(target_name + uni_len);
|
|
|
|
chgblob->TargetInfoArray.Length = 0;
|
|
/* Add target info list for NetBIOS/DNS settings */
|
|
for (type = NTLMSSP_AV_NB_COMPUTER_NAME;
|
|
type <= NTLMSSP_AV_DNS_DOMAIN_NAME; type++) {
|
|
tinfo->Type = cpu_to_le16(type);
|
|
tinfo->Length = cpu_to_le16(uni_len);
|
|
memcpy(tinfo->Content, name, uni_len);
|
|
tinfo = (struct target_info *)((char *)tinfo + 4 + uni_len);
|
|
target_info_len += 4 + uni_len;
|
|
}
|
|
|
|
/* Add terminator subblock */
|
|
tinfo->Type = 0;
|
|
tinfo->Length = 0;
|
|
target_info_len += 4;
|
|
|
|
chgblob->TargetInfoArray.Length = cpu_to_le16(target_info_len);
|
|
chgblob->TargetInfoArray.MaximumLength = cpu_to_le16(target_info_len);
|
|
blob_len += target_info_len;
|
|
kfree(name);
|
|
ksmbd_debug(AUTH, "NTLMSSP SecurityBufferLength %d\n", blob_len);
|
|
return blob_len;
|
|
}
|
|
|
|
#ifdef CONFIG_SMB_SERVER_KERBEROS5
|
|
int ksmbd_krb5_authenticate(struct ksmbd_session *sess, char *in_blob,
|
|
int in_len, char *out_blob, int *out_len)
|
|
{
|
|
struct ksmbd_spnego_authen_response *resp;
|
|
struct ksmbd_user *user = NULL;
|
|
int retval;
|
|
|
|
resp = ksmbd_ipc_spnego_authen_request(in_blob, in_len);
|
|
if (!resp) {
|
|
ksmbd_debug(AUTH, "SPNEGO_AUTHEN_REQUEST failure\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!(resp->login_response.status & KSMBD_USER_FLAG_OK)) {
|
|
ksmbd_debug(AUTH, "krb5 authentication failure\n");
|
|
retval = -EPERM;
|
|
goto out;
|
|
}
|
|
|
|
if (*out_len <= resp->spnego_blob_len) {
|
|
ksmbd_debug(AUTH, "buf len %d, but blob len %d\n",
|
|
*out_len, resp->spnego_blob_len);
|
|
retval = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
if (resp->session_key_len > sizeof(sess->sess_key)) {
|
|
ksmbd_debug(AUTH, "session key is too long\n");
|
|
retval = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
user = ksmbd_alloc_user(&resp->login_response);
|
|
if (!user) {
|
|
ksmbd_debug(AUTH, "login failure\n");
|
|
retval = -ENOMEM;
|
|
goto out;
|
|
}
|
|
sess->user = user;
|
|
|
|
memcpy(sess->sess_key, resp->payload, resp->session_key_len);
|
|
memcpy(out_blob, resp->payload + resp->session_key_len,
|
|
resp->spnego_blob_len);
|
|
*out_len = resp->spnego_blob_len;
|
|
retval = 0;
|
|
out:
|
|
kvfree(resp);
|
|
return retval;
|
|
}
|
|
#else
|
|
int ksmbd_krb5_authenticate(struct ksmbd_session *sess, char *in_blob,
|
|
int in_len, char *out_blob, int *out_len)
|
|
{
|
|
return -EOPNOTSUPP;
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* ksmbd_sign_smb2_pdu() - function to generate packet signing
|
|
* @conn: connection
|
|
* @key: signing key
|
|
* @iov: buffer iov array
|
|
* @n_vec: number of iovecs
|
|
* @sig: signature value generated for client request packet
|
|
*
|
|
*/
|
|
int ksmbd_sign_smb2_pdu(struct ksmbd_conn *conn, char *key, struct kvec *iov,
|
|
int n_vec, char *sig)
|
|
{
|
|
struct ksmbd_crypto_ctx *ctx;
|
|
int rc, i;
|
|
|
|
ctx = ksmbd_crypto_ctx_find_hmacsha256();
|
|
if (!ctx) {
|
|
ksmbd_debug(AUTH, "could not crypto alloc hmacmd5\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
rc = crypto_shash_setkey(CRYPTO_HMACSHA256_TFM(ctx),
|
|
key,
|
|
SMB2_NTLMV2_SESSKEY_SIZE);
|
|
if (rc)
|
|
goto out;
|
|
|
|
rc = crypto_shash_init(CRYPTO_HMACSHA256(ctx));
|
|
if (rc) {
|
|
ksmbd_debug(AUTH, "hmacsha256 init error %d\n", rc);
|
|
goto out;
|
|
}
|
|
|
|
for (i = 0; i < n_vec; i++) {
|
|
rc = crypto_shash_update(CRYPTO_HMACSHA256(ctx),
|
|
iov[i].iov_base,
|
|
iov[i].iov_len);
|
|
if (rc) {
|
|
ksmbd_debug(AUTH, "hmacsha256 update error %d\n", rc);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
rc = crypto_shash_final(CRYPTO_HMACSHA256(ctx), sig);
|
|
if (rc)
|
|
ksmbd_debug(AUTH, "hmacsha256 generation error %d\n", rc);
|
|
out:
|
|
ksmbd_release_crypto_ctx(ctx);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* ksmbd_sign_smb3_pdu() - function to generate packet signing
|
|
* @conn: connection
|
|
* @key: signing key
|
|
* @iov: buffer iov array
|
|
* @n_vec: number of iovecs
|
|
* @sig: signature value generated for client request packet
|
|
*
|
|
*/
|
|
int ksmbd_sign_smb3_pdu(struct ksmbd_conn *conn, char *key, struct kvec *iov,
|
|
int n_vec, char *sig)
|
|
{
|
|
struct ksmbd_crypto_ctx *ctx;
|
|
int rc, i;
|
|
|
|
ctx = ksmbd_crypto_ctx_find_cmacaes();
|
|
if (!ctx) {
|
|
ksmbd_debug(AUTH, "could not crypto alloc cmac\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
rc = crypto_shash_setkey(CRYPTO_CMACAES_TFM(ctx),
|
|
key,
|
|
SMB2_CMACAES_SIZE);
|
|
if (rc)
|
|
goto out;
|
|
|
|
rc = crypto_shash_init(CRYPTO_CMACAES(ctx));
|
|
if (rc) {
|
|
ksmbd_debug(AUTH, "cmaces init error %d\n", rc);
|
|
goto out;
|
|
}
|
|
|
|
for (i = 0; i < n_vec; i++) {
|
|
rc = crypto_shash_update(CRYPTO_CMACAES(ctx),
|
|
iov[i].iov_base,
|
|
iov[i].iov_len);
|
|
if (rc) {
|
|
ksmbd_debug(AUTH, "cmaces update error %d\n", rc);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
rc = crypto_shash_final(CRYPTO_CMACAES(ctx), sig);
|
|
if (rc)
|
|
ksmbd_debug(AUTH, "cmaces generation error %d\n", rc);
|
|
out:
|
|
ksmbd_release_crypto_ctx(ctx);
|
|
return rc;
|
|
}
|
|
|
|
struct derivation {
|
|
struct kvec label;
|
|
struct kvec context;
|
|
bool binding;
|
|
};
|
|
|
|
static int generate_key(struct ksmbd_conn *conn, struct ksmbd_session *sess,
|
|
struct kvec label, struct kvec context, __u8 *key,
|
|
unsigned int key_size)
|
|
{
|
|
unsigned char zero = 0x0;
|
|
__u8 i[4] = {0, 0, 0, 1};
|
|
__u8 L128[4] = {0, 0, 0, 128};
|
|
__u8 L256[4] = {0, 0, 1, 0};
|
|
int rc;
|
|
unsigned char prfhash[SMB2_HMACSHA256_SIZE];
|
|
unsigned char *hashptr = prfhash;
|
|
struct ksmbd_crypto_ctx *ctx;
|
|
|
|
memset(prfhash, 0x0, SMB2_HMACSHA256_SIZE);
|
|
memset(key, 0x0, key_size);
|
|
|
|
ctx = ksmbd_crypto_ctx_find_hmacsha256();
|
|
if (!ctx) {
|
|
ksmbd_debug(AUTH, "could not crypto alloc hmacmd5\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
rc = crypto_shash_setkey(CRYPTO_HMACSHA256_TFM(ctx),
|
|
sess->sess_key,
|
|
SMB2_NTLMV2_SESSKEY_SIZE);
|
|
if (rc)
|
|
goto smb3signkey_ret;
|
|
|
|
rc = crypto_shash_init(CRYPTO_HMACSHA256(ctx));
|
|
if (rc) {
|
|
ksmbd_debug(AUTH, "hmacsha256 init error %d\n", rc);
|
|
goto smb3signkey_ret;
|
|
}
|
|
|
|
rc = crypto_shash_update(CRYPTO_HMACSHA256(ctx), i, 4);
|
|
if (rc) {
|
|
ksmbd_debug(AUTH, "could not update with n\n");
|
|
goto smb3signkey_ret;
|
|
}
|
|
|
|
rc = crypto_shash_update(CRYPTO_HMACSHA256(ctx),
|
|
label.iov_base,
|
|
label.iov_len);
|
|
if (rc) {
|
|
ksmbd_debug(AUTH, "could not update with label\n");
|
|
goto smb3signkey_ret;
|
|
}
|
|
|
|
rc = crypto_shash_update(CRYPTO_HMACSHA256(ctx), &zero, 1);
|
|
if (rc) {
|
|
ksmbd_debug(AUTH, "could not update with zero\n");
|
|
goto smb3signkey_ret;
|
|
}
|
|
|
|
rc = crypto_shash_update(CRYPTO_HMACSHA256(ctx),
|
|
context.iov_base,
|
|
context.iov_len);
|
|
if (rc) {
|
|
ksmbd_debug(AUTH, "could not update with context\n");
|
|
goto smb3signkey_ret;
|
|
}
|
|
|
|
if (conn->cipher_type == SMB2_ENCRYPTION_AES256_CCM ||
|
|
conn->cipher_type == SMB2_ENCRYPTION_AES256_GCM)
|
|
rc = crypto_shash_update(CRYPTO_HMACSHA256(ctx), L256, 4);
|
|
else
|
|
rc = crypto_shash_update(CRYPTO_HMACSHA256(ctx), L128, 4);
|
|
if (rc) {
|
|
ksmbd_debug(AUTH, "could not update with L\n");
|
|
goto smb3signkey_ret;
|
|
}
|
|
|
|
rc = crypto_shash_final(CRYPTO_HMACSHA256(ctx), hashptr);
|
|
if (rc) {
|
|
ksmbd_debug(AUTH, "Could not generate hmacmd5 hash error %d\n",
|
|
rc);
|
|
goto smb3signkey_ret;
|
|
}
|
|
|
|
memcpy(key, hashptr, key_size);
|
|
|
|
smb3signkey_ret:
|
|
ksmbd_release_crypto_ctx(ctx);
|
|
return rc;
|
|
}
|
|
|
|
static int generate_smb3signingkey(struct ksmbd_session *sess,
|
|
struct ksmbd_conn *conn,
|
|
const struct derivation *signing)
|
|
{
|
|
int rc;
|
|
struct channel *chann;
|
|
char *key;
|
|
|
|
chann = lookup_chann_list(sess, conn);
|
|
if (!chann)
|
|
return 0;
|
|
|
|
if (conn->dialect >= SMB30_PROT_ID && signing->binding)
|
|
key = chann->smb3signingkey;
|
|
else
|
|
key = sess->smb3signingkey;
|
|
|
|
rc = generate_key(conn, sess, signing->label, signing->context, key,
|
|
SMB3_SIGN_KEY_SIZE);
|
|
if (rc)
|
|
return rc;
|
|
|
|
if (!(conn->dialect >= SMB30_PROT_ID && signing->binding))
|
|
memcpy(chann->smb3signingkey, key, SMB3_SIGN_KEY_SIZE);
|
|
|
|
ksmbd_debug(AUTH, "dumping generated AES signing keys\n");
|
|
ksmbd_debug(AUTH, "Session Id %llu\n", sess->id);
|
|
ksmbd_debug(AUTH, "Session Key %*ph\n",
|
|
SMB2_NTLMV2_SESSKEY_SIZE, sess->sess_key);
|
|
ksmbd_debug(AUTH, "Signing Key %*ph\n",
|
|
SMB3_SIGN_KEY_SIZE, key);
|
|
return 0;
|
|
}
|
|
|
|
int ksmbd_gen_smb30_signingkey(struct ksmbd_session *sess,
|
|
struct ksmbd_conn *conn)
|
|
{
|
|
struct derivation d;
|
|
|
|
d.label.iov_base = "SMB2AESCMAC";
|
|
d.label.iov_len = 12;
|
|
d.context.iov_base = "SmbSign";
|
|
d.context.iov_len = 8;
|
|
d.binding = conn->binding;
|
|
|
|
return generate_smb3signingkey(sess, conn, &d);
|
|
}
|
|
|
|
int ksmbd_gen_smb311_signingkey(struct ksmbd_session *sess,
|
|
struct ksmbd_conn *conn)
|
|
{
|
|
struct derivation d;
|
|
|
|
d.label.iov_base = "SMBSigningKey";
|
|
d.label.iov_len = 14;
|
|
if (conn->binding) {
|
|
struct preauth_session *preauth_sess;
|
|
|
|
preauth_sess = ksmbd_preauth_session_lookup(conn, sess->id);
|
|
if (!preauth_sess)
|
|
return -ENOENT;
|
|
d.context.iov_base = preauth_sess->Preauth_HashValue;
|
|
} else {
|
|
d.context.iov_base = sess->Preauth_HashValue;
|
|
}
|
|
d.context.iov_len = 64;
|
|
d.binding = conn->binding;
|
|
|
|
return generate_smb3signingkey(sess, conn, &d);
|
|
}
|
|
|
|
struct derivation_twin {
|
|
struct derivation encryption;
|
|
struct derivation decryption;
|
|
};
|
|
|
|
static int generate_smb3encryptionkey(struct ksmbd_conn *conn,
|
|
struct ksmbd_session *sess,
|
|
const struct derivation_twin *ptwin)
|
|
{
|
|
int rc;
|
|
|
|
rc = generate_key(conn, sess, ptwin->encryption.label,
|
|
ptwin->encryption.context, sess->smb3encryptionkey,
|
|
SMB3_ENC_DEC_KEY_SIZE);
|
|
if (rc)
|
|
return rc;
|
|
|
|
rc = generate_key(conn, sess, ptwin->decryption.label,
|
|
ptwin->decryption.context,
|
|
sess->smb3decryptionkey, SMB3_ENC_DEC_KEY_SIZE);
|
|
if (rc)
|
|
return rc;
|
|
|
|
ksmbd_debug(AUTH, "dumping generated AES encryption keys\n");
|
|
ksmbd_debug(AUTH, "Cipher type %d\n", conn->cipher_type);
|
|
ksmbd_debug(AUTH, "Session Id %llu\n", sess->id);
|
|
ksmbd_debug(AUTH, "Session Key %*ph\n",
|
|
SMB2_NTLMV2_SESSKEY_SIZE, sess->sess_key);
|
|
if (conn->cipher_type == SMB2_ENCRYPTION_AES256_CCM ||
|
|
conn->cipher_type == SMB2_ENCRYPTION_AES256_GCM) {
|
|
ksmbd_debug(AUTH, "ServerIn Key %*ph\n",
|
|
SMB3_GCM256_CRYPTKEY_SIZE, sess->smb3encryptionkey);
|
|
ksmbd_debug(AUTH, "ServerOut Key %*ph\n",
|
|
SMB3_GCM256_CRYPTKEY_SIZE, sess->smb3decryptionkey);
|
|
} else {
|
|
ksmbd_debug(AUTH, "ServerIn Key %*ph\n",
|
|
SMB3_GCM128_CRYPTKEY_SIZE, sess->smb3encryptionkey);
|
|
ksmbd_debug(AUTH, "ServerOut Key %*ph\n",
|
|
SMB3_GCM128_CRYPTKEY_SIZE, sess->smb3decryptionkey);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int ksmbd_gen_smb30_encryptionkey(struct ksmbd_conn *conn,
|
|
struct ksmbd_session *sess)
|
|
{
|
|
struct derivation_twin twin;
|
|
struct derivation *d;
|
|
|
|
d = &twin.encryption;
|
|
d->label.iov_base = "SMB2AESCCM";
|
|
d->label.iov_len = 11;
|
|
d->context.iov_base = "ServerOut";
|
|
d->context.iov_len = 10;
|
|
|
|
d = &twin.decryption;
|
|
d->label.iov_base = "SMB2AESCCM";
|
|
d->label.iov_len = 11;
|
|
d->context.iov_base = "ServerIn ";
|
|
d->context.iov_len = 10;
|
|
|
|
return generate_smb3encryptionkey(conn, sess, &twin);
|
|
}
|
|
|
|
int ksmbd_gen_smb311_encryptionkey(struct ksmbd_conn *conn,
|
|
struct ksmbd_session *sess)
|
|
{
|
|
struct derivation_twin twin;
|
|
struct derivation *d;
|
|
|
|
d = &twin.encryption;
|
|
d->label.iov_base = "SMBS2CCipherKey";
|
|
d->label.iov_len = 16;
|
|
d->context.iov_base = sess->Preauth_HashValue;
|
|
d->context.iov_len = 64;
|
|
|
|
d = &twin.decryption;
|
|
d->label.iov_base = "SMBC2SCipherKey";
|
|
d->label.iov_len = 16;
|
|
d->context.iov_base = sess->Preauth_HashValue;
|
|
d->context.iov_len = 64;
|
|
|
|
return generate_smb3encryptionkey(conn, sess, &twin);
|
|
}
|
|
|
|
int ksmbd_gen_preauth_integrity_hash(struct ksmbd_conn *conn, char *buf,
|
|
__u8 *pi_hash)
|
|
{
|
|
int rc;
|
|
struct smb2_hdr *rcv_hdr = smb2_get_msg(buf);
|
|
char *all_bytes_msg = (char *)&rcv_hdr->ProtocolId;
|
|
int msg_size = get_rfc1002_len(buf);
|
|
struct ksmbd_crypto_ctx *ctx = NULL;
|
|
|
|
if (conn->preauth_info->Preauth_HashId !=
|
|
SMB2_PREAUTH_INTEGRITY_SHA512)
|
|
return -EINVAL;
|
|
|
|
ctx = ksmbd_crypto_ctx_find_sha512();
|
|
if (!ctx) {
|
|
ksmbd_debug(AUTH, "could not alloc sha512\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
rc = crypto_shash_init(CRYPTO_SHA512(ctx));
|
|
if (rc) {
|
|
ksmbd_debug(AUTH, "could not init shashn");
|
|
goto out;
|
|
}
|
|
|
|
rc = crypto_shash_update(CRYPTO_SHA512(ctx), pi_hash, 64);
|
|
if (rc) {
|
|
ksmbd_debug(AUTH, "could not update with n\n");
|
|
goto out;
|
|
}
|
|
|
|
rc = crypto_shash_update(CRYPTO_SHA512(ctx), all_bytes_msg, msg_size);
|
|
if (rc) {
|
|
ksmbd_debug(AUTH, "could not update with n\n");
|
|
goto out;
|
|
}
|
|
|
|
rc = crypto_shash_final(CRYPTO_SHA512(ctx), pi_hash);
|
|
if (rc) {
|
|
ksmbd_debug(AUTH, "Could not generate hash err : %d\n", rc);
|
|
goto out;
|
|
}
|
|
out:
|
|
ksmbd_release_crypto_ctx(ctx);
|
|
return rc;
|
|
}
|
|
|
|
int ksmbd_gen_sd_hash(struct ksmbd_conn *conn, char *sd_buf, int len,
|
|
__u8 *pi_hash)
|
|
{
|
|
int rc;
|
|
struct ksmbd_crypto_ctx *ctx = NULL;
|
|
|
|
ctx = ksmbd_crypto_ctx_find_sha256();
|
|
if (!ctx) {
|
|
ksmbd_debug(AUTH, "could not alloc sha256\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
rc = crypto_shash_init(CRYPTO_SHA256(ctx));
|
|
if (rc) {
|
|
ksmbd_debug(AUTH, "could not init shashn");
|
|
goto out;
|
|
}
|
|
|
|
rc = crypto_shash_update(CRYPTO_SHA256(ctx), sd_buf, len);
|
|
if (rc) {
|
|
ksmbd_debug(AUTH, "could not update with n\n");
|
|
goto out;
|
|
}
|
|
|
|
rc = crypto_shash_final(CRYPTO_SHA256(ctx), pi_hash);
|
|
if (rc) {
|
|
ksmbd_debug(AUTH, "Could not generate hash err : %d\n", rc);
|
|
goto out;
|
|
}
|
|
out:
|
|
ksmbd_release_crypto_ctx(ctx);
|
|
return rc;
|
|
}
|
|
|
|
static int ksmbd_get_encryption_key(struct ksmbd_conn *conn, __u64 ses_id,
|
|
int enc, u8 *key)
|
|
{
|
|
struct ksmbd_session *sess;
|
|
u8 *ses_enc_key;
|
|
|
|
sess = ksmbd_session_lookup_all(conn, ses_id);
|
|
if (!sess)
|
|
return -EINVAL;
|
|
|
|
ses_enc_key = enc ? sess->smb3encryptionkey :
|
|
sess->smb3decryptionkey;
|
|
memcpy(key, ses_enc_key, SMB3_ENC_DEC_KEY_SIZE);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline void smb2_sg_set_buf(struct scatterlist *sg, const void *buf,
|
|
unsigned int buflen)
|
|
{
|
|
void *addr;
|
|
|
|
if (is_vmalloc_addr(buf))
|
|
addr = vmalloc_to_page(buf);
|
|
else
|
|
addr = virt_to_page(buf);
|
|
sg_set_page(sg, addr, buflen, offset_in_page(buf));
|
|
}
|
|
|
|
static struct scatterlist *ksmbd_init_sg(struct kvec *iov, unsigned int nvec,
|
|
u8 *sign)
|
|
{
|
|
struct scatterlist *sg;
|
|
unsigned int assoc_data_len = sizeof(struct smb2_transform_hdr) - 20;
|
|
int i, nr_entries[3] = {0}, total_entries = 0, sg_idx = 0;
|
|
|
|
if (!nvec)
|
|
return NULL;
|
|
|
|
for (i = 0; i < nvec - 1; i++) {
|
|
unsigned long kaddr = (unsigned long)iov[i + 1].iov_base;
|
|
|
|
if (is_vmalloc_addr(iov[i + 1].iov_base)) {
|
|
nr_entries[i] = ((kaddr + iov[i + 1].iov_len +
|
|
PAGE_SIZE - 1) >> PAGE_SHIFT) -
|
|
(kaddr >> PAGE_SHIFT);
|
|
} else {
|
|
nr_entries[i]++;
|
|
}
|
|
total_entries += nr_entries[i];
|
|
}
|
|
|
|
/* Add two entries for transform header and signature */
|
|
total_entries += 2;
|
|
|
|
sg = kmalloc_array(total_entries, sizeof(struct scatterlist), GFP_KERNEL);
|
|
if (!sg)
|
|
return NULL;
|
|
|
|
sg_init_table(sg, total_entries);
|
|
smb2_sg_set_buf(&sg[sg_idx++], iov[0].iov_base + 24, assoc_data_len);
|
|
for (i = 0; i < nvec - 1; i++) {
|
|
void *data = iov[i + 1].iov_base;
|
|
int len = iov[i + 1].iov_len;
|
|
|
|
if (is_vmalloc_addr(data)) {
|
|
int j, offset = offset_in_page(data);
|
|
|
|
for (j = 0; j < nr_entries[i]; j++) {
|
|
unsigned int bytes = PAGE_SIZE - offset;
|
|
|
|
if (!len)
|
|
break;
|
|
|
|
if (bytes > len)
|
|
bytes = len;
|
|
|
|
sg_set_page(&sg[sg_idx++],
|
|
vmalloc_to_page(data), bytes,
|
|
offset_in_page(data));
|
|
|
|
data += bytes;
|
|
len -= bytes;
|
|
offset = 0;
|
|
}
|
|
} else {
|
|
sg_set_page(&sg[sg_idx++], virt_to_page(data), len,
|
|
offset_in_page(data));
|
|
}
|
|
}
|
|
smb2_sg_set_buf(&sg[sg_idx], sign, SMB2_SIGNATURE_SIZE);
|
|
return sg;
|
|
}
|
|
|
|
int ksmbd_crypt_message(struct ksmbd_conn *conn, struct kvec *iov,
|
|
unsigned int nvec, int enc)
|
|
{
|
|
struct smb2_transform_hdr *tr_hdr = smb2_get_msg(iov[0].iov_base);
|
|
unsigned int assoc_data_len = sizeof(struct smb2_transform_hdr) - 20;
|
|
int rc;
|
|
struct scatterlist *sg;
|
|
u8 sign[SMB2_SIGNATURE_SIZE] = {};
|
|
u8 key[SMB3_ENC_DEC_KEY_SIZE];
|
|
struct aead_request *req;
|
|
char *iv;
|
|
unsigned int iv_len;
|
|
struct crypto_aead *tfm;
|
|
unsigned int crypt_len = le32_to_cpu(tr_hdr->OriginalMessageSize);
|
|
struct ksmbd_crypto_ctx *ctx;
|
|
|
|
rc = ksmbd_get_encryption_key(conn,
|
|
le64_to_cpu(tr_hdr->SessionId),
|
|
enc,
|
|
key);
|
|
if (rc) {
|
|
pr_err("Could not get %scryption key\n", enc ? "en" : "de");
|
|
return rc;
|
|
}
|
|
|
|
if (conn->cipher_type == SMB2_ENCRYPTION_AES128_GCM ||
|
|
conn->cipher_type == SMB2_ENCRYPTION_AES256_GCM)
|
|
ctx = ksmbd_crypto_ctx_find_gcm();
|
|
else
|
|
ctx = ksmbd_crypto_ctx_find_ccm();
|
|
if (!ctx) {
|
|
pr_err("crypto alloc failed\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
if (conn->cipher_type == SMB2_ENCRYPTION_AES128_GCM ||
|
|
conn->cipher_type == SMB2_ENCRYPTION_AES256_GCM)
|
|
tfm = CRYPTO_GCM(ctx);
|
|
else
|
|
tfm = CRYPTO_CCM(ctx);
|
|
|
|
if (conn->cipher_type == SMB2_ENCRYPTION_AES256_CCM ||
|
|
conn->cipher_type == SMB2_ENCRYPTION_AES256_GCM)
|
|
rc = crypto_aead_setkey(tfm, key, SMB3_GCM256_CRYPTKEY_SIZE);
|
|
else
|
|
rc = crypto_aead_setkey(tfm, key, SMB3_GCM128_CRYPTKEY_SIZE);
|
|
if (rc) {
|
|
pr_err("Failed to set aead key %d\n", rc);
|
|
goto free_ctx;
|
|
}
|
|
|
|
rc = crypto_aead_setauthsize(tfm, SMB2_SIGNATURE_SIZE);
|
|
if (rc) {
|
|
pr_err("Failed to set authsize %d\n", rc);
|
|
goto free_ctx;
|
|
}
|
|
|
|
req = aead_request_alloc(tfm, GFP_KERNEL);
|
|
if (!req) {
|
|
rc = -ENOMEM;
|
|
goto free_ctx;
|
|
}
|
|
|
|
if (!enc) {
|
|
memcpy(sign, &tr_hdr->Signature, SMB2_SIGNATURE_SIZE);
|
|
crypt_len += SMB2_SIGNATURE_SIZE;
|
|
}
|
|
|
|
sg = ksmbd_init_sg(iov, nvec, sign);
|
|
if (!sg) {
|
|
pr_err("Failed to init sg\n");
|
|
rc = -ENOMEM;
|
|
goto free_req;
|
|
}
|
|
|
|
iv_len = crypto_aead_ivsize(tfm);
|
|
iv = kzalloc(iv_len, GFP_KERNEL);
|
|
if (!iv) {
|
|
rc = -ENOMEM;
|
|
goto free_sg;
|
|
}
|
|
|
|
if (conn->cipher_type == SMB2_ENCRYPTION_AES128_GCM ||
|
|
conn->cipher_type == SMB2_ENCRYPTION_AES256_GCM) {
|
|
memcpy(iv, (char *)tr_hdr->Nonce, SMB3_AES_GCM_NONCE);
|
|
} else {
|
|
iv[0] = 3;
|
|
memcpy(iv + 1, (char *)tr_hdr->Nonce, SMB3_AES_CCM_NONCE);
|
|
}
|
|
|
|
aead_request_set_crypt(req, sg, sg, crypt_len, iv);
|
|
aead_request_set_ad(req, assoc_data_len);
|
|
aead_request_set_callback(req, CRYPTO_TFM_REQ_MAY_SLEEP, NULL, NULL);
|
|
|
|
if (enc)
|
|
rc = crypto_aead_encrypt(req);
|
|
else
|
|
rc = crypto_aead_decrypt(req);
|
|
if (rc)
|
|
goto free_iv;
|
|
|
|
if (enc)
|
|
memcpy(&tr_hdr->Signature, sign, SMB2_SIGNATURE_SIZE);
|
|
|
|
free_iv:
|
|
kfree(iv);
|
|
free_sg:
|
|
kfree(sg);
|
|
free_req:
|
|
kfree(req);
|
|
free_ctx:
|
|
ksmbd_release_crypto_ctx(ctx);
|
|
return rc;
|
|
}
|