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auth.c
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auth.c
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2016 Namjae Jeon <[email protected]>
* Copyright (C) 2018 Samsung Electronics Co., Ltd.
*/
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/uaccess.h>
#include <linux/backing-dev.h>
#include <linux/writeback.h>
#include <linux/uio.h>
#include <linux/xattr.h>
#include <crypto/aead.h>
#include "auth.h"
#include "glob.h"
#include "encrypt.h"
#include "server.h"
#include "smb_common.h"
#include "transport_tcp.h"
#include "mgmt/user_session.h"
#include "mgmt/user_config.h"
/*
* Fixed format data defining GSS header and fixed string
* "not_defined_in_RFC4178@please_ignore".
* So sec blob data in neg phase could be generated statically.
*/
static char NEGOTIATE_GSS_HEADER[AUTH_GSS_LENGTH] = {
0x60, 0x48, 0x06, 0x06, 0x2b, 0x06, 0x01, 0x05,
0x05, 0x02, 0xa0, 0x3e, 0x30, 0x3c, 0xa0, 0x0e,
0x30, 0x0c, 0x06, 0x0a, 0x2b, 0x06, 0x01, 0x04,
0x01, 0x82, 0x37, 0x02, 0x02, 0x0a, 0xa3, 0x2a,
0x30, 0x28, 0xa0, 0x26, 0x1b, 0x24, 0x6e, 0x6f,
0x74, 0x5f, 0x64, 0x65, 0x66, 0x69, 0x6e, 0x65,
0x64, 0x5f, 0x69, 0x6e, 0x5f, 0x52, 0x46, 0x43,
0x34, 0x31, 0x37, 0x38, 0x40, 0x70, 0x6c, 0x65,
0x61, 0x73, 0x65, 0x5f, 0x69, 0x67, 0x6e, 0x6f,
0x72, 0x65
};
void cifsd_copy_gss_neg_header(void *buf)
{
memcpy(buf, NEGOTIATE_GSS_HEADER, AUTH_GSS_LENGTH);
}
static inline void free_hmacmd5(struct cifsd_tcp_conn *conn)
{
crypto_free_shash(conn->secmech.hmacmd5);
conn->secmech.hmacmd5 = NULL;
kfree(conn->secmech.sdeschmacmd5);
conn->secmech.sdeschmacmd5 = NULL;
}
static inline void free_hmacsha256(struct cifsd_tcp_conn *conn)
{
crypto_free_shash(conn->secmech.hmacsha256);
conn->secmech.hmacsha256 = NULL;
kfree(conn->secmech.sdeschmacsha256);
conn->secmech.sdeschmacsha256 = NULL;
}
static inline void free_cmacaes(struct cifsd_tcp_conn *conn)
{
crypto_free_shash(conn->secmech.cmacaes);
conn->secmech.cmacaes = NULL;
kfree(conn->secmech.sdesccmacaes);
conn->secmech.sdesccmacaes = NULL;
}
static inline void free_sha512(struct cifsd_tcp_conn *conn)
{
crypto_free_shash(conn->secmech.sha512);
conn->secmech.sha512 = NULL;
kfree(conn->secmech.sdescsha512);
conn->secmech.sdescsha512 = NULL;
}
static inline void free_sdescmd5(struct cifsd_tcp_conn *conn)
{
kfree(conn->secmech.md5);
conn->secmech.md5 = NULL;
kfree(conn->secmech.sdescmd5);
conn->secmech.sdescmd5 = NULL;
}
static inline void free_ccmaes(struct cifsd_tcp_conn *conn)
{
crypto_free_aead(conn->secmech.ccmaesencrypt);
conn->secmech.ccmaesencrypt = NULL;
crypto_free_aead(conn->secmech.ccmaesdecrypt);
conn->secmech.ccmaesencrypt = NULL;
}
void cifsd_free_conn_secmech(struct cifsd_tcp_conn *conn)
{
free_hmacmd5(conn);
free_hmacsha256(conn);
free_cmacaes(conn);
free_sha512(conn);
free_sdescmd5(conn);
free_ccmaes(conn);
}
static int crypto_hmacmd5_alloc(struct cifsd_tcp_conn *conn)
{
int rc;
unsigned int size;
/* check if already allocated */
if (conn->secmech.sdeschmacmd5)
return 0;
conn->secmech.hmacmd5 = crypto_alloc_shash("hmac(md5)", 0, 0);
if (IS_ERR(conn->secmech.hmacmd5)) {
cifsd_debug("could not allocate crypto hmacmd5\n");
rc = PTR_ERR(conn->secmech.hmacmd5);
conn->secmech.hmacmd5 = NULL;
return rc;
}
size = sizeof(struct shash_desc) +
crypto_shash_descsize(conn->secmech.hmacmd5);
conn->secmech.sdeschmacmd5 = kmalloc(size, GFP_KERNEL);
if (!conn->secmech.sdeschmacmd5) {
free_hmacmd5(conn);
return -ENOMEM;
}
conn->secmech.sdeschmacmd5->shash.tfm = conn->secmech.hmacmd5;
conn->secmech.sdeschmacmd5->shash.flags = 0x0;
return 0;
}
/**
* cifsd_gen_sess_key() - function to generate session key
* @sess: session of connection
* @hash: source hash value to be used for find session key
* @hmac: source hmac value to be used for finding session key
*
*/
static int cifsd_gen_sess_key(struct cifsd_session *sess,
char *hash,
char *hmac)
{
int rc;
rc = crypto_hmacmd5_alloc(sess->conn);
if (rc) {
cifsd_debug("could not crypto alloc hmacmd5 rc %d\n", rc);
goto out;
}
rc = crypto_shash_setkey(sess->conn->secmech.hmacmd5, hash,
CIFS_HMAC_MD5_HASH_SIZE);
if (rc) {
cifsd_debug("hmacmd5 set key fail error %d\n", rc);
goto out;
}
rc = crypto_shash_init(&sess->conn->secmech.sdeschmacmd5->shash);
if (rc) {
cifsd_debug("could not init hmacmd5 error %d\n", rc);
goto out;
}
rc = crypto_shash_update(&sess->conn->secmech.sdeschmacmd5->shash,
hmac, SMB2_NTLMV2_SESSKEY_SIZE);
if (rc) {
cifsd_debug("Could not update with response error %d\n", rc);
goto out;
}
rc = crypto_shash_final(&sess->conn->secmech.sdeschmacmd5->shash,
sess->sess_key);
if (rc) {
cifsd_debug("Could not generate hmacmd5 hash error %d\n", rc);
goto out;
}
out:
return rc;
}
static int calc_ntlmv2_hash(struct cifsd_session *sess, char *ntlmv2_hash,
char *dname)
{
int ret, len;
wchar_t *domain;
__le16 *uniname;
if (!sess->conn->secmech.sdeschmacmd5) {
cifsd_debug("can't generate ntlmv2 hash\n");
return -1;
}
ret = crypto_shash_setkey(sess->conn->secmech.hmacmd5,
user_passkey(sess->user), CIFS_ENCPWD_SIZE);
if (ret) {
cifsd_debug("Could not set NT Hash as a key\n");
return ret;
}
ret = crypto_shash_init(&sess->conn->secmech.sdeschmacmd5->shash);
if (ret) {
cifsd_debug("could not init hmacmd5\n");
return ret;
}
/* convert user_name to unicode */
len = strlen(user_name(sess->user));
uniname = kzalloc(2 + UNICODE_LEN(len), GFP_KERNEL);
if (!uniname) {
ret = -ENOMEM;
return ret;
}
if (len) {
len = smb_strtoUTF16(uniname, user_name(sess->user), len,
sess->conn->local_nls);
UniStrupr(uniname);
}
ret = crypto_shash_update(&sess->conn->secmech.sdeschmacmd5->shash,
(char *)uniname, UNICODE_LEN(len));
if (ret) {
cifsd_debug("Could not update with user\n");
kfree(uniname);
return ret;
}
/* Convert domain name or conn name to unicode and uppercase */
len = strlen(dname);
domain = kzalloc(2 + UNICODE_LEN(len), GFP_KERNEL);
if (!domain) {
cifsd_debug("memory allocation failed\n");
ret = -ENOMEM;
kfree(uniname);
return ret;
}
len = smb_strtoUTF16((__le16 *)domain, dname, len,
sess->conn->local_nls);
ret = crypto_shash_update(&sess->conn->secmech.sdeschmacmd5->shash,
(char *)domain, UNICODE_LEN(len));
if (ret) {
cifsd_debug("Could not update with domain\n");
kfree(uniname);
kfree(domain);
return ret;
}
ret = crypto_shash_final(&sess->conn->secmech.sdeschmacmd5->shash,
ntlmv2_hash);
if (ret)
cifsd_debug("Could not generate md5 hash\n");
kfree(uniname);
kfree(domain);
return ret;
}
/**
* cifsd_auth_ntlm() - NTLM authentication handler
* @sess: session of connection
* @pw_buf: NTLM challenge response
* @passkey: user password
*
* Return: 0 on success, error number on error
*/
int cifsd_auth_ntlm(struct cifsd_session *sess, char *pw_buf)
{
int rc;
unsigned char p21[21];
char key[CIFS_AUTH_RESP_SIZE];
memset(p21, '\0', 21);
memcpy(p21, user_passkey(sess->user), CIFS_NTHASH_SIZE);
rc = cifsd_enc_p24(p21, sess->ntlmssp.cryptkey, key);
if (rc) {
cifsd_err("password processing failed\n");
return rc;
}
cifsd_enc_md4(sess->sess_key,
user_passkey(sess->user),
CIFS_SMB1_SESSKEY_SIZE);
memcpy(sess->sess_key + CIFS_SMB1_SESSKEY_SIZE, key,
CIFS_AUTH_RESP_SIZE);
sess->sequence_number = 1;
if (strncmp(pw_buf, key, CIFS_AUTH_RESP_SIZE) != 0) {
cifsd_debug("ntlmv1 authentication failed\n");
rc = -EINVAL;
} else
cifsd_debug("ntlmv1 authentication pass\n");
return rc;
}
/**
* cifsd_auth_ntlmv2() - NTLMv2 authentication handler
* @sess: session of connection
* @ntlmv2: NTLMv2 challenge response
* @blen: NTLMv2 blob length
* @domain_name: domain name
*
* Return: 0 on success, error number on error
*/
int cifsd_auth_ntlmv2(struct cifsd_session *sess,
struct ntlmv2_resp *ntlmv2,
int blen,
char *domain_name)
{
char ntlmv2_hash[CIFS_ENCPWD_SIZE];
char ntlmv2_rsp[CIFS_HMAC_MD5_HASH_SIZE];
char *construct;
int rc, len;
rc = crypto_hmacmd5_alloc(sess->conn);
if (rc) {
cifsd_debug("could not crypto alloc hmacmd5 rc %d\n", rc);
goto out;
}
if (!strcmp(domain_name, cifsd_netbios_name()))
rc = calc_ntlmv2_hash(sess, ntlmv2_hash, cifsd_netbios_name());
else
rc = calc_ntlmv2_hash(sess, ntlmv2_hash, domain_name);
if (rc) {
cifsd_debug("could not get v2 hash rc %d\n", rc);
goto out;
}
rc = crypto_shash_setkey(sess->conn->secmech.hmacmd5, ntlmv2_hash,
CIFS_HMAC_MD5_HASH_SIZE);
if (rc) {
cifsd_debug("Could not set NTLMV2 Hash as a key\n");
goto out;
}
rc = crypto_shash_init(&sess->conn->secmech.sdeschmacmd5->shash);
if (rc) {
cifsd_debug("Could not init hmacmd5\n");
goto out;
}
len = CIFS_CRYPTO_KEY_SIZE + blen;
construct = kzalloc(len, GFP_KERNEL);
if (!construct) {
cifsd_debug("Memory allocation failed\n");
rc = -ENOMEM;
goto out;
}
memcpy(construct, sess->ntlmssp.cryptkey, CIFS_CRYPTO_KEY_SIZE);
memcpy(construct + CIFS_CRYPTO_KEY_SIZE,
(char *)(&ntlmv2->blob_signature), blen);
rc = crypto_shash_update(&sess->conn->secmech.sdeschmacmd5->shash,
construct, len);
if (rc) {
cifsd_debug("Could not update with response\n");
goto out;
}
rc = crypto_shash_final(&sess->conn->secmech.sdeschmacmd5->shash,
ntlmv2_rsp);
if (rc) {
cifsd_debug("Could not generate md5 hash\n");
goto out;
}
rc = cifsd_gen_sess_key(sess, ntlmv2_hash, ntlmv2_rsp);
if (rc) {
cifsd_debug("%s: Could not generate sess key\n", __func__);
goto out;
}
rc = memcmp(ntlmv2->ntlmv2_hash, ntlmv2_rsp, CIFS_HMAC_MD5_HASH_SIZE);
out:
return rc;
}
/**
* __cifsd_auth_ntlmv2() - NTLM2(extended security) authentication handler
* @sess: session of connection
* @client_nonce: client nonce from LM response.
* @ntlm_resp: ntlm response data from client.
*
* Return: 0 on success, error number on error
*/
static int __cifsd_auth_ntlmv2(struct cifsd_session *sess,
char *client_nonce,
char *ntlm_resp)
{
char sess_key[CIFS_SMB1_SESSKEY_SIZE] = {0};
int rc;
unsigned char p21[21];
char key[CIFS_AUTH_RESP_SIZE];
rc = cifsd_enc_update_sess_key(sess_key,
client_nonce,
(char *)sess->ntlmssp.cryptkey, 8);
if (rc) {
cifsd_err("password processing failed\n");
goto out;
}
memset(p21, '\0', 21);
memcpy(p21, user_passkey(sess->user), CIFS_NTHASH_SIZE);
rc = cifsd_enc_p24(p21, sess_key, key);
if (rc) {
cifsd_err("password processing failed\n");
goto out;
}
rc = memcmp(ntlm_resp, key, CIFS_AUTH_RESP_SIZE);
out:
return rc;
}
/**
* cifsd_decode_ntlmssp_auth_blob() - helper function to construct
* authenticate blob
* @authblob: authenticate blob source pointer
* @usr: user details
* @sess: session of connection
*
* Return: 0 on success, error number on error
*/
int cifsd_decode_ntlmssp_auth_blob(AUTHENTICATE_MESSAGE *authblob,
int blob_len,
struct cifsd_session *sess)
{
char *domain_name;
unsigned int lm_off, nt_off;
unsigned short nt_len;
if (blob_len < sizeof(AUTHENTICATE_MESSAGE)) {
cifsd_debug("negotiate blob len %d too small\n", blob_len);
return -EINVAL;
}
if (memcmp(authblob->Signature, "NTLMSSP", 8)) {
cifsd_debug("blob signature incorrect %s\n",
authblob->Signature);
return -EINVAL;
}
lm_off = le32_to_cpu(authblob->LmChallengeResponse.BufferOffset);
nt_off = le32_to_cpu(authblob->NtChallengeResponse.BufferOffset);
nt_len = le16_to_cpu(authblob->NtChallengeResponse.Length);
/* process NTLM authentication */
if (nt_len == CIFS_AUTH_RESP_SIZE) {
if (le32_to_cpu(authblob->NegotiateFlags)
& NTLMSSP_NEGOTIATE_EXTENDED_SEC)
return __cifsd_auth_ntlmv2(sess, (char *)authblob +
lm_off, (char *)authblob + nt_off);
else
return cifsd_auth_ntlm(sess, (char *)authblob +
nt_off);
}
/* TODO : use domain name that imported from configuration file */
domain_name = smb_strndup_from_utf16(
(const char *)authblob +
le32_to_cpu(authblob->DomainName.BufferOffset),
le16_to_cpu(authblob->DomainName.Length), true,
sess->conn->local_nls);
/* process NTLMv2 authentication */
cifsd_debug("decode_ntlmssp_authenticate_blob dname%s\n",
domain_name);
return cifsd_auth_ntlmv2(sess, (struct ntlmv2_resp *)((char *)authblob +
nt_off), nt_len - CIFS_ENCPWD_SIZE, domain_name);
}
/**
* cifsd_decode_ntlmssp_neg_blob() - helper function to construct
* negotiate blob
* @negblob: negotiate blob source pointer
* @rsp: response header pointer to be updated
* @sess: session of connection
*
*/
int cifsd_decode_ntlmssp_neg_blob(NEGOTIATE_MESSAGE *negblob,
int blob_len,
struct cifsd_session *sess)
{
if (blob_len < sizeof(NEGOTIATE_MESSAGE)) {
cifsd_debug("negotiate blob len %d too small\n", blob_len);
return -EINVAL;
}
if (memcmp(negblob->Signature, "NTLMSSP", 8)) {
cifsd_debug("blob signature incorrect %s\n",
negblob->Signature);
return -EINVAL;
}
sess->ntlmssp.client_flags = le32_to_cpu(negblob->NegotiateFlags);
return 0;
}
/**
* cifsd_build_ntlmssp_challenge_blob() - helper function to construct
* challenge blob
* @chgblob: challenge blob source pointer to initialize
* @rsp: response header pointer to be updated
* @sess: session of connection
*
*/
unsigned int cifsd_build_ntlmssp_challenge_blob(CHALLENGE_MESSAGE *chgblob,
struct cifsd_session *sess)
{
TargetInfo *tinfo;
wchar_t *name;
__u8 *target_name;
unsigned int len, flags, blob_off, blob_len, type, target_info_len = 0;
int cflags = sess->ntlmssp.client_flags;
memcpy(chgblob->Signature, NTLMSSP_SIGNATURE, 8);
chgblob->MessageType = NtLmChallenge;
flags = NTLMSSP_NEGOTIATE_UNICODE |
NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_TARGET_TYPE_SERVER |
NTLMSSP_NEGOTIATE_TARGET_INFO |
NTLMSSP_NEGOTIATE_VERSION;
if (cflags & NTLMSSP_NEGOTIATE_SIGN) {
flags |= NTLMSSP_NEGOTIATE_SIGN;
flags |= cflags & (NTLMSSP_NEGOTIATE_128 |
NTLMSSP_NEGOTIATE_56);
}
if (cflags & NTLMSSP_NEGOTIATE_ALWAYS_SIGN)
flags |= NTLMSSP_NEGOTIATE_ALWAYS_SIGN;
if (cflags & NTLMSSP_REQUEST_TARGET)
flags |= NTLMSSP_REQUEST_TARGET;
if (sess->conn->use_spnego &&
(cflags & NTLMSSP_NEGOTIATE_EXTENDED_SEC))
flags |= NTLMSSP_NEGOTIATE_EXTENDED_SEC;
chgblob->NegotiateFlags = cpu_to_le32(flags);
len = strlen(cifsd_netbios_name());
name = kmalloc(2 + (len * 2), GFP_KERNEL);
if (!name)
return -ENOMEM;
len = smb_strtoUTF16((__le16 *)name, cifsd_netbios_name(), len,
sess->conn->local_nls);
len = UNICODE_LEN(len);
blob_off = sizeof(CHALLENGE_MESSAGE);
blob_len = blob_off + len;
chgblob->TargetName.Length = cpu_to_le16(len);
chgblob->TargetName.MaximumLength = cpu_to_le16(len);
chgblob->TargetName.BufferOffset = cpu_to_le32(blob_off);
/* Initialize random conn challenge */
get_random_bytes(sess->ntlmssp.cryptkey, sizeof(__u64));
memcpy(chgblob->Challenge, sess->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, len);
tinfo = (TargetInfo *)(target_name + 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(len);
memcpy(tinfo->Content, name, len);
tinfo = (TargetInfo *)((char *)tinfo + 4 + len);
target_info_len += 4 + len;
}
/* Add terminator subblock */
tinfo->Type = 0;
tinfo->Length = 0;
target_info_len += 4;
chgblob->TargetInfoArray.Length = chgblob->TargetInfoArray.MaximumLength =
cpu_to_le16(target_info_len);
blob_len += target_info_len;
kfree(name);
cifsd_debug("NTLMSSP SecurityBufferLength %d\n", blob_len);
return blob_len;
}
#ifdef CONFIG_CIFS_INSECURE_SERVER
static int crypto_md5_alloc(struct cifsd_tcp_conn *conn)
{
int rc;
unsigned int size;
/* check if already allocated */
if (conn->secmech.md5)
return 0;
conn->secmech.md5 = crypto_alloc_shash("md5", 0, 0);
if (IS_ERR(conn->secmech.md5)) {
cifsd_debug("could not allocate crypto md5\n");
rc = PTR_ERR(conn->secmech.md5);
conn->secmech.md5 = NULL;
return rc;
}
size = sizeof(struct shash_desc) +
crypto_shash_descsize(conn->secmech.md5);
conn->secmech.sdescmd5 = kmalloc(size, GFP_KERNEL);
if (!conn->secmech.sdescmd5) {
free_sdescmd5(conn);
return -ENOMEM;
}
conn->secmech.sdescmd5->shash.tfm = conn->secmech.md5;
conn->secmech.sdescmd5->shash.flags = 0x0;
return 0;
}
/**
* cifsd_sign_smb1_pdu() - function to generate SMB1 packet signing
* @sess: session of connection
* @iov: buffer iov array
* @n_vec: number of iovecs
* @sig: signature value generated for client request packet
*
*/
int cifsd_sign_smb1_pdu(struct cifsd_session *sess,
struct kvec *iov,
int n_vec,
char *sig)
{
int rc;
int i;
rc = crypto_md5_alloc(sess->conn);
if (rc) {
cifsd_debug("could not crypto alloc md5 rc %d\n", rc);
goto out;
}
rc = crypto_shash_init(&sess->conn->secmech.sdescmd5->shash);
if (rc) {
cifsd_debug("md5 init error %d\n", rc);
goto out;
}
rc = crypto_shash_update(&sess->conn->secmech.sdescmd5->shash,
sess->sess_key, 40);
if (rc) {
cifsd_debug("md5 update error %d\n", rc);
goto out;
}
for (i = 0; i < n_vec; i++) {
rc = crypto_shash_update(
&sess->conn->secmech.sdescmd5->shash,
iov[i].iov_base, iov[i].iov_len);
if (rc) {
cifsd_debug("md5 update error %d\n", rc);
goto out;
}
}
rc = crypto_shash_final(&sess->conn->secmech.sdescmd5->shash, sig);
if (rc)
cifsd_debug("md5 generation error %d\n", rc);
out:
return rc;
}
#else
int cifsd_sign_smb1_pdu(struct cifsd_session *sess,
struct kvec *iov,
int n_vec,
char *sig)
{
return -ENOTSUPP;
}
#endif
static int crypto_hmacsha256_alloc(struct cifsd_tcp_conn *conn)
{
int rc;
unsigned int size;
/* check if already allocated */
if (conn->secmech.hmacsha256)
return 0;
conn->secmech.hmacsha256 = crypto_alloc_shash("hmac(sha256)", 0, 0);
if (IS_ERR(conn->secmech.hmacsha256)) {
cifsd_debug("could not allocate crypto hmacsha256\n");
rc = PTR_ERR(conn->secmech.hmacsha256);
conn->secmech.hmacsha256 = NULL;
return rc;
}
size = sizeof(struct shash_desc) +
crypto_shash_descsize(conn->secmech.hmacsha256);
conn->secmech.sdeschmacsha256 = kmalloc(size, GFP_KERNEL);
if (!conn->secmech.sdeschmacsha256) {
free_hmacsha256(conn);
return -ENOMEM;
}
conn->secmech.sdeschmacsha256->shash.tfm = conn->secmech.hmacsha256;
conn->secmech.sdeschmacsha256->shash.flags = 0x0;
return 0;
}
static int crypto_cmac_alloc(struct cifsd_tcp_conn *conn)
{
int rc;
unsigned int size;
/* check if already allocated */
if (conn->secmech.sdesccmacaes)
return 0;
conn->secmech.cmacaes = crypto_alloc_shash("cmac(aes)", 0, 0);
if (IS_ERR(conn->secmech.cmacaes)) {
cifsd_debug("could not allocate crypto cmac-aes\n");
rc = PTR_ERR(conn->secmech.cmacaes);
conn->secmech.cmacaes = NULL;
return rc;
}
size = sizeof(struct shash_desc) +
crypto_shash_descsize(conn->secmech.cmacaes);
conn->secmech.sdesccmacaes = kmalloc(size, GFP_KERNEL);
if (!conn->secmech.sdesccmacaes) {
free_cmacaes(conn);
return -ENOMEM;
}
conn->secmech.sdesccmacaes->shash.tfm = conn->secmech.cmacaes;
conn->secmech.sdesccmacaes->shash.flags = 0x0;
return 0;
}
static int crypto_sha512_alloc(struct cifsd_tcp_conn *conn)
{
int rc;
unsigned int size;
/* check if already allocated */
if (conn->secmech.sdescsha512)
return 0;
cifsd_debug("Inside crypto_sha512_alloc\n");
conn->secmech.sha512 = crypto_alloc_shash("sha512", 0, 0);
if (IS_ERR(conn->secmech.sha512)) {
cifsd_debug("could not allocate crypto sha512\n");
rc = PTR_ERR(conn->secmech.sha512);
conn->secmech.sha512 = NULL;
return rc;
}
size = sizeof(struct shash_desc) +
crypto_shash_descsize(conn->secmech.sha512);
conn->secmech.sdescsha512 = kmalloc(size, GFP_KERNEL);
if (!conn->secmech.sdescsha512) {
free_sha512(conn);
return -ENOMEM;
}
conn->secmech.sdescsha512->shash.tfm = conn->secmech.sha512;
conn->secmech.sdescsha512->shash.flags = 0x0;
return 0;
}
/**
* cifsd_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 cifsd_sign_smb2_pdu(struct cifsd_tcp_conn *conn,
char *key,
struct kvec *iov,
int n_vec,
char *sig)
{
int rc;
int i;
rc = crypto_hmacsha256_alloc(conn);
if (rc) {
cifsd_debug("could not crypto alloc hmacmd5 rc %d\n", rc);
goto out;
}
rc = crypto_shash_setkey(conn->secmech.hmacsha256, key,
SMB2_NTLMV2_SESSKEY_SIZE);
if (rc) {
cifsd_debug("hmacsha256 update error %d\n", rc);
goto out;
}
rc = crypto_shash_init(&conn->secmech.sdeschmacsha256->shash);
if (rc) {
cifsd_debug("hmacsha256 init error %d\n", rc);
goto out;
}
for (i = 0; i < n_vec; i++) {
rc = crypto_shash_update(
&conn->secmech.sdeschmacsha256->shash,
iov[i].iov_base, iov[i].iov_len);
if (rc) {
cifsd_debug("hmacsha256 update error %d\n", rc);
goto out;
}
}
rc = crypto_shash_final(&conn->secmech.sdeschmacsha256->shash,
sig);
if (rc)
cifsd_debug("hmacsha256 generation error %d\n", rc);
out:
return rc;
}
/**
* cifsd_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 cifsd_sign_smb3_pdu(struct cifsd_tcp_conn *conn,
char *key,
struct kvec *iov,
int n_vec,
char *sig)
{
int rc;
int i;
rc = crypto_shash_setkey(conn->secmech.cmacaes, key,
SMB2_CMACAES_SIZE);
if (rc) {
cifsd_debug("cmaces update error %d\n", rc);
goto out;
}
rc = crypto_shash_init(&conn->secmech.sdesccmacaes->shash);
if (rc) {
cifsd_debug("cmaces init error %d\n", rc);
goto out;
}
for (i = 0; i < n_vec; i++) {
rc = crypto_shash_update(
&conn->secmech.sdesccmacaes->shash,
iov[i].iov_base, iov[i].iov_len);
if (rc) {
cifsd_debug("cmaces update error %d\n", rc);
goto out;
}
}
rc = crypto_shash_final(&conn->secmech.sdesccmacaes->shash,
sig);
if (rc)
cifsd_debug("cmaces generation error %d\n", rc);
out:
return rc;
}
struct derivation {
struct kvec label;
struct kvec context;
bool binding;
};
static int generate_key(struct cifsd_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 L[4] = {0, 0, 0, 128};
int rc = 0;
unsigned char prfhash[SMB2_HMACSHA256_SIZE];
unsigned char *hashptr = prfhash;
memset(prfhash, 0x0, SMB2_HMACSHA256_SIZE);
memset(key, 0x0, key_size);
rc = crypto_hmacsha256_alloc(sess->conn);
if (rc) {
cifsd_debug("could not crypto alloc hmacmd5 rc %d\n", rc);
goto smb3signkey_ret;
}
rc = crypto_cmac_alloc(sess->conn);
if (rc) {
cifsd_debug("could not crypto alloc cmac rc %d\n", rc);
goto smb3signkey_ret;
}
rc = crypto_shash_setkey(sess->conn->secmech.hmacsha256,
sess->sess_key, SMB2_NTLMV2_SESSKEY_SIZE);
if (rc) {
cifsd_debug("could not set with session key\n");
goto smb3signkey_ret;
}
rc = crypto_shash_init(&sess->conn->secmech.sdeschmacsha256->shash);
if (rc) {
cifsd_debug("could not init sign hmac\n");
goto smb3signkey_ret;
}
rc = crypto_shash_update(&sess->conn->secmech.sdeschmacsha256->shash,
i, 4);
if (rc) {
cifsd_debug("could not update with n\n");
goto smb3signkey_ret;
}
rc = crypto_shash_update(&sess->conn->secmech.sdeschmacsha256->shash,
label.iov_base, label.iov_len);
if (rc) {
cifsd_debug("could not update with label\n");
goto smb3signkey_ret;
}
rc = crypto_shash_update(&sess->conn->secmech.sdeschmacsha256->shash,
&zero, 1);
if (rc) {
cifsd_debug("could not update with zero\n");
goto smb3signkey_ret;
}
rc = crypto_shash_update(&sess->conn->secmech.sdeschmacsha256->shash,
context.iov_base, context.iov_len);
if (rc) {
cifsd_debug("could not update with context\n");
goto smb3signkey_ret;
}
rc = crypto_shash_update(&sess->conn->secmech.sdeschmacsha256->shash,
L, 4);
if (rc) {
cifsd_debug("could not update with L\n");
goto smb3signkey_ret;
}
rc = crypto_shash_final(&sess->conn->secmech.sdeschmacsha256->shash,
hashptr);
if (rc) {
cifsd_debug("Could not generate hmacmd5 hash error %d\n", rc);
goto smb3signkey_ret;
}
memcpy(key, hashptr, key_size);
smb3signkey_ret:
return rc;
}
static int generate_smb3signingkey(struct cifsd_session *sess,
const struct derivation *signing)
{
int rc;
struct channel *chann;
char *key;
chann = lookup_chann_list(sess);
if (!chann)
return 0;
if (sess->conn->dialect >= SMB30_PROT_ID && signing->binding)
key = chann->smb3signingkey;
else