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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/hash.h>
#include <crypto/aead.h>
#include <linux/random.h>
#include <linux/scatterlist.h>
#include "auth.h"
#include "glob.h"
#include <linux/fips.h>
#ifdef CONFIG_SMB_INSECURE_SERVER
#include <crypto/des.h>
#endif
#include "server.h"
#include "smb_common.h"
#include "connection.h"
#include "mgmt/user_session.h"
#include "mgmt/user_config.h"
#include "crypto_ctx.h"
#include "transport_ipc.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, 0x5e, 0x06, 0x06, 0x2b, 0x06, 0x01, 0x05,
0x05, 0x02, 0xa0, 0x54, 0x30, 0x52, 0xa0, 0x24,
0x30, 0x22, 0x06, 0x09, 0x2a, 0x86, 0x48, 0x86,
0xf7, 0x12, 0x01, 0x02, 0x02, 0x06, 0x09, 0x2a,
0x86, 0x48, 0x82, 0xf7, 0x12, 0x01, 0x02, 0x02,
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 ksmbd_copy_gss_neg_header(void *buf)
{
memcpy(buf, NEGOTIATE_GSS_HEADER, AUTH_GSS_LENGTH);
}
#ifdef CONFIG_SMB_INSECURE_SERVER
static void
str_to_key(unsigned char *str, unsigned char *key)
{
int i;
key[0] = str[0] >> 1;
key[1] = ((str[0] & 0x01) << 6) | (str[1] >> 2);
key[2] = ((str[1] & 0x03) << 5) | (str[2] >> 3);
key[3] = ((str[2] & 0x07) << 4) | (str[3] >> 4);
key[4] = ((str[3] & 0x0F) << 3) | (str[4] >> 5);
key[5] = ((str[4] & 0x1F) << 2) | (str[5] >> 6);
key[6] = ((str[5] & 0x3F) << 1) | (str[6] >> 7);
key[7] = str[6] & 0x7F;
for (i = 0; i < 8; i++)
key[i] = (key[i] << 1);
}
static int
smbhash(unsigned char *out, const unsigned char *in, unsigned char *key)
{
unsigned char key2[8];
struct des_ctx ctx;
if (fips_enabled) {
ksmbd_debug(AUTH, "FIPS compliance enabled: DES not permitted\n");
return -ENOENT;
}
str_to_key(key, key2);
des_expand_key(&ctx, key2, DES_KEY_SIZE);
des_encrypt(&ctx, out, in);
memzero_explicit(&ctx, sizeof(ctx));
return 0;
}
static int ksmbd_enc_p24(unsigned char *p21, const unsigned char *c8, unsigned char *p24)
{
int rc;
rc = smbhash(p24, c8, p21);
if (rc)
return rc;
rc = smbhash(p24 + 8, c8, p21 + 7);
if (rc)
return rc;
return smbhash(p24 + 16, c8, p21 + 14);
}
/* produce a md4 message digest from data of length n bytes */
static int ksmbd_enc_md4(unsigned char *md4_hash, unsigned char *link_str,
int link_len)
{
int rc;
struct ksmbd_crypto_ctx *ctx;
ctx = ksmbd_crypto_ctx_find_md4();
if (!ctx) {
ksmbd_debug(AUTH, "Crypto md4 allocation error\n");
return -ENOMEM;
}
rc = crypto_shash_init(CRYPTO_MD4(ctx));
if (rc) {
ksmbd_debug(AUTH, "Could not init md4 shash\n");
goto out;
}
rc = crypto_shash_update(CRYPTO_MD4(ctx), link_str, link_len);
if (rc) {
ksmbd_debug(AUTH, "Could not update with link_str\n");
goto out;
}
rc = crypto_shash_final(CRYPTO_MD4(ctx), md4_hash);
if (rc)
ksmbd_debug(AUTH, "Could not generate md4 hash\n");
out:
ksmbd_release_crypto_ctx(ctx);
return rc;
}
static int ksmbd_enc_update_sess_key(unsigned char *md5_hash, char *nonce,
char *server_challenge, int len)
{
int rc;
struct ksmbd_crypto_ctx *ctx;
ctx = ksmbd_crypto_ctx_find_md5();
if (!ctx) {
ksmbd_debug(AUTH, "Crypto md5 allocation error\n");
return -ENOMEM;
}
rc = crypto_shash_init(CRYPTO_MD5(ctx));
if (rc) {
ksmbd_debug(AUTH, "Could not init md5 shash\n");
goto out;
}
rc = crypto_shash_update(CRYPTO_MD5(ctx), server_challenge, len);
if (rc) {
ksmbd_debug(AUTH, "Could not update with challenge\n");
goto out;
}
rc = crypto_shash_update(CRYPTO_MD5(ctx), nonce, len);
if (rc) {
ksmbd_debug(AUTH, "Could not update with nonce\n");
goto out;
}
rc = crypto_shash_final(CRYPTO_MD5(ctx), md5_hash);
if (rc)
ksmbd_debug(AUTH, "Could not generate md5 hash\n");
out:
ksmbd_release_crypto_ctx(ctx);
return rc;
}
#endif
/**
* ksmbd_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 ksmbd_gen_sess_key(struct ksmbd_session *sess, char *hash,
char *hmac)
{
struct ksmbd_crypto_ctx *ctx;
int rc;
ctx = ksmbd_crypto_ctx_find_hmacmd5();
if (!ctx) {
ksmbd_debug(AUTH, "could not crypto alloc hmacmd5\n");
return -ENOMEM;
}
rc = crypto_shash_setkey(CRYPTO_HMACMD5_TFM(ctx),
hash,
CIFS_HMAC_MD5_HASH_SIZE);
if (rc) {
ksmbd_debug(AUTH, "hmacmd5 set key fail error %d\n", rc);
goto out;
}
rc = crypto_shash_init(CRYPTO_HMACMD5(ctx));
if (rc) {
ksmbd_debug(AUTH, "could not init hmacmd5 error %d\n", rc);
goto out;
}
rc = crypto_shash_update(CRYPTO_HMACMD5(ctx),
hmac,
SMB2_NTLMV2_SESSKEY_SIZE);
if (rc) {
ksmbd_debug(AUTH, "Could not update with response error %d\n", rc);
goto out;
}
rc = crypto_shash_final(CRYPTO_HMACMD5(ctx), sess->sess_key);
if (rc) {
ksmbd_debug(AUTH, "Could not generate hmacmd5 hash error %d\n", rc);
goto out;
}
out:
ksmbd_release_crypto_ctx(ctx);
return rc;
}
static int calc_ntlmv2_hash(struct ksmbd_conn *conn, struct ksmbd_session *sess,
char *ntlmv2_hash, char *dname)
{
int ret, len, conv_len;
wchar_t *domain = NULL;
__le16 *uniname = NULL;
struct ksmbd_crypto_ctx *ctx;
ctx = ksmbd_crypto_ctx_find_hmacmd5();
if (!ctx) {
ksmbd_debug(AUTH, "can't generate ntlmv2 hash\n");
return -ENOMEM;
}
ret = crypto_shash_setkey(CRYPTO_HMACMD5_TFM(ctx),
user_passkey(sess->user),
CIFS_ENCPWD_SIZE);
if (ret) {
ksmbd_debug(AUTH, "Could not set NT Hash as a key\n");
goto out;
}
ret = crypto_shash_init(CRYPTO_HMACMD5(ctx));
if (ret) {
ksmbd_debug(AUTH, "could not init hmacmd5\n");
goto out;
}
/* convert user_name to unicode */
len = strlen(user_name(sess->user));
uniname = kzalloc(2 + UNICODE_LEN(len), KSMBD_DEFAULT_GFP);
if (!uniname) {
ret = -ENOMEM;
goto out;
}
conv_len = smb_strtoUTF16(uniname, user_name(sess->user), len,
conn->local_nls);
if (conv_len < 0 || conv_len > len) {
ret = -EINVAL;
goto out;
}
UniStrupr(uniname);
ret = crypto_shash_update(CRYPTO_HMACMD5(ctx),
(char *)uniname,
UNICODE_LEN(conv_len));
if (ret) {
ksmbd_debug(AUTH, "Could not update with user\n");
goto out;
}
/* Convert domain name or conn name to unicode and uppercase */
len = strlen(dname);
domain = kzalloc(2 + UNICODE_LEN(len), KSMBD_DEFAULT_GFP);
if (!domain) {
ret = -ENOMEM;
goto out;
}
conv_len = smb_strtoUTF16((__le16 *)domain, dname, len,
conn->local_nls);
if (conv_len < 0 || conv_len > len) {
ret = -EINVAL;
goto out;
}
ret = crypto_shash_update(CRYPTO_HMACMD5(ctx),
(char *)domain,
UNICODE_LEN(conv_len));
if (ret) {
ksmbd_debug(AUTH, "Could not update with domain\n");
goto out;
}
ret = crypto_shash_final(CRYPTO_HMACMD5(ctx), ntlmv2_hash);
if (ret)
ksmbd_debug(AUTH, "Could not generate md5 hash\n");
out:
kfree(uniname);
kfree(domain);
ksmbd_release_crypto_ctx(ctx);
return ret;
}
#ifdef CONFIG_SMB_INSECURE_SERVER
/**
* ksmbd_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 ksmbd_auth_ntlm(struct ksmbd_session *sess, char *pw_buf, char *cryptkey)
{
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 = ksmbd_enc_p24(p21, cryptkey, key);
if (rc) {
pr_err("password processing failed\n");
return rc;
}
ksmbd_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) {
ksmbd_debug(AUTH, "ntlmv1 authentication failed\n");
return -EINVAL;
}
ksmbd_debug(AUTH, "ntlmv1 authentication pass\n");
return 0;
}
#endif
/**
* ksmbd_auth_ntlmv2() - NTLMv2 authentication handler
* @conn: connection
* @sess: session of connection
* @ntlmv2: NTLMv2 challenge response
* @blen: NTLMv2 blob length
* @domain_name: domain name
* @cryptkey: session crypto key
*
* Return: 0 on success, error number on error
*/
int ksmbd_auth_ntlmv2(struct ksmbd_conn *conn, struct ksmbd_session *sess,
struct ntlmv2_resp *ntlmv2, int blen, char *domain_name,
char *cryptkey)
{
char ntlmv2_hash[CIFS_ENCPWD_SIZE];
char ntlmv2_rsp[CIFS_HMAC_MD5_HASH_SIZE];
struct ksmbd_crypto_ctx *ctx = NULL;
char *construct = NULL;
int rc, len;
rc = calc_ntlmv2_hash(conn, sess, ntlmv2_hash, domain_name);
if (rc) {
ksmbd_debug(AUTH, "could not get v2 hash rc %d\n", rc);
goto out;
}
ctx = ksmbd_crypto_ctx_find_hmacmd5();
if (!ctx) {
ksmbd_debug(AUTH, "could not crypto alloc hmacmd5\n");
return -ENOMEM;
}
rc = crypto_shash_setkey(CRYPTO_HMACMD5_TFM(ctx),
ntlmv2_hash,
CIFS_HMAC_MD5_HASH_SIZE);
if (rc) {
ksmbd_debug(AUTH, "Could not set NTLMV2 Hash as a key\n");
goto out;
}
rc = crypto_shash_init(CRYPTO_HMACMD5(ctx));
if (rc) {
ksmbd_debug(AUTH, "Could not init hmacmd5\n");
goto out;
}
len = CIFS_CRYPTO_KEY_SIZE + blen;
construct = kzalloc(len, KSMBD_DEFAULT_GFP);
if (!construct) {
rc = -ENOMEM;
goto out;
}
memcpy(construct, cryptkey, CIFS_CRYPTO_KEY_SIZE);
memcpy(construct + CIFS_CRYPTO_KEY_SIZE, &ntlmv2->blob_signature, blen);
rc = crypto_shash_update(CRYPTO_HMACMD5(ctx), construct, len);
if (rc) {
ksmbd_debug(AUTH, "Could not update with response\n");
goto out;
}
rc = crypto_shash_final(CRYPTO_HMACMD5(ctx), ntlmv2_rsp);
if (rc) {
ksmbd_debug(AUTH, "Could not generate md5 hash\n");
goto out;
}
ksmbd_release_crypto_ctx(ctx);
ctx = NULL;
rc = ksmbd_gen_sess_key(sess, ntlmv2_hash, ntlmv2_rsp);
if (rc) {
ksmbd_debug(AUTH, "Could not generate sess key\n");
goto out;
}
if (memcmp(ntlmv2->ntlmv2_hash, ntlmv2_rsp, CIFS_HMAC_MD5_HASH_SIZE) != 0)
rc = -EINVAL;
out:
if (ctx)
ksmbd_release_crypto_ctx(ctx);
kfree(construct);
return rc;
}
#ifdef CONFIG_SMB_INSECURE_SERVER
/**
* __ksmbd_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 __ksmbd_auth_ntlmv2(struct ksmbd_session *sess,
char *client_nonce,
char *ntlm_resp,
char *cryptkey)
{
char sess_key[CIFS_SMB1_SESSKEY_SIZE] = {0};
int rc;
unsigned char p21[21];
char key[CIFS_AUTH_RESP_SIZE];
rc = ksmbd_enc_update_sess_key(sess_key, client_nonce, cryptkey, 8);
if (rc) {
pr_err("password processing failed\n");
goto out;
}
memset(p21, '\0', 21);
memcpy(p21, user_passkey(sess->user), CIFS_NTHASH_SIZE);
rc = ksmbd_enc_p24(p21, sess_key, key);
if (rc) {
pr_err("password processing failed\n");
goto out;
}
if (memcmp(ntlm_resp, key, CIFS_AUTH_RESP_SIZE) != 0)
rc = -EINVAL;
out:
return rc;
}
#endif
static int cifs_arc4_setkey(struct arc4_ctx *ctx, const u8 *in_key, unsigned int key_len)
{
int i, j = 0, k = 0;
ctx->x = 1;
ctx->y = 0;
for (i = 0; i < 256; i++)
ctx->S[i] = i;
for (i = 0; i < 256; i++) {
u32 a = ctx->S[i];
j = (j + in_key[k] + a) & 0xff;
ctx->S[i] = ctx->S[j];
ctx->S[j] = a;
if (++k >= key_len)
k = 0;
}
return 0;
}
static void cifs_arc4_crypt(struct arc4_ctx *ctx, u8 *out, const u8 *in, unsigned int len)
{
u32 *const S = ctx->S;
u32 x, y, a, b;
u32 ty, ta, tb;
if (len == 0)
return;
x = ctx->x;
y = ctx->y;
a = S[x];
y = (y + a) & 0xff;
b = S[y];
do {
S[y] = a;
a = (a + b) & 0xff;
S[x] = b;
x = (x + 1) & 0xff;
ta = S[x];
ty = (y + ta) & 0xff;
tb = S[ty];
*out++ = *in++ ^ S[a];
if (--len == 0)
break;
y = ty;
a = ta;
b = tb;
} while (true);
ctx->x = x;
ctx->y = y;
}
/**
* ksmbd_decode_ntlmssp_auth_blob() - helper function to construct
* authenticate blob
* @authblob: authenticate blob source pointer
* @blob_len: length of the @authblob message
* @conn: connection
* @sess: session of connection
*
* Return: 0 on success, error number on error
*/
int ksmbd_decode_ntlmssp_auth_blob(struct authenticate_message *authblob,
int blob_len, struct ksmbd_conn *conn,
struct ksmbd_session *sess)
{
char *domain_name;
unsigned int nt_off, dn_off;
unsigned short nt_len, dn_len;
#ifdef CONFIG_SMB_INSECURE_SERVER
unsigned int lm_off;
unsigned short lm_len;
#endif
int ret;
if (blob_len < sizeof(struct authenticate_message)) {
ksmbd_debug(AUTH, "negotiate blob len %d too small\n",
blob_len);
return -EINVAL;
}
if (memcmp(authblob->Signature, "NTLMSSP", 8)) {
ksmbd_debug(AUTH, "blob signature incorrect %s\n",
authblob->Signature);
return -EINVAL;
}
nt_off = le32_to_cpu(authblob->NtChallengeResponse.BufferOffset);
nt_len = le16_to_cpu(authblob->NtChallengeResponse.Length);
dn_off = le32_to_cpu(authblob->DomainName.BufferOffset);
dn_len = le16_to_cpu(authblob->DomainName.Length);
if (blob_len < (u64)dn_off + dn_len || blob_len < (u64)nt_off + nt_len ||
nt_len < CIFS_ENCPWD_SIZE)
return -EINVAL;
#ifdef CONFIG_SMB_INSECURE_SERVER
lm_off = le32_to_cpu(authblob->LmChallengeResponse.BufferOffset);
lm_len = le16_to_cpu(authblob->LmChallengeResponse.Length);
if (blob_len < (u64)lm_off + lm_len)
return -EINVAL;
/* process NTLM authentication */
if (nt_len == CIFS_AUTH_RESP_SIZE) {
if (le32_to_cpu(authblob->NegotiateFlags) &
NTLMSSP_NEGOTIATE_EXTENDED_SEC)
return __ksmbd_auth_ntlmv2(sess,
(char *)authblob + lm_off,
(char *)authblob + nt_off,
conn->ntlmssp.cryptkey);
else
return ksmbd_auth_ntlm(sess, (char *)authblob +
nt_off, conn->ntlmssp.cryptkey);
}
#endif
/* TODO : use domain name that imported from configuration file */
domain_name = smb_strndup_from_utf16((const char *)authblob + dn_off,
dn_len, true, conn->local_nls);
if (IS_ERR(domain_name))
return PTR_ERR(domain_name);
/* process NTLMv2 authentication */
ksmbd_debug(AUTH, "decode_ntlmssp_authenticate_blob dname%s\n",
domain_name);
ret = ksmbd_auth_ntlmv2(conn, sess,
(struct ntlmv2_resp *)((char *)authblob + nt_off),
nt_len - CIFS_ENCPWD_SIZE,
domain_name, conn->ntlmssp.cryptkey);
kfree(domain_name);
/* The recovered secondary session key */
if (conn->ntlmssp.client_flags & NTLMSSP_NEGOTIATE_KEY_XCH) {
struct arc4_ctx *ctx_arc4;
unsigned int sess_key_off, sess_key_len;
sess_key_off = le32_to_cpu(authblob->SessionKey.BufferOffset);
sess_key_len = le16_to_cpu(authblob->SessionKey.Length);
if (blob_len < (u64)sess_key_off + sess_key_len)
return -EINVAL;
if (sess_key_len > CIFS_KEY_SIZE)
return -EINVAL;
ctx_arc4 = kmalloc(sizeof(*ctx_arc4), KSMBD_DEFAULT_GFP);
if (!ctx_arc4)
return -ENOMEM;
cifs_arc4_setkey(ctx_arc4, sess->sess_key,
SMB2_NTLMV2_SESSKEY_SIZE);
cifs_arc4_crypt(ctx_arc4, sess->sess_key,
(char *)authblob + sess_key_off, sess_key_len);
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 9, 0)
kfree_sensitive(ctx_arc4);
#else
memzero_explicit((void *)ctx_arc4, sizeof(*ctx_arc4));
kfree(ctx_arc4);
#endif
}
return ret;
}
/**
* ksmbd_decode_ntlmssp_neg_blob() - helper function to construct
* negotiate blob
* @negblob: negotiate blob source pointer
* @blob_len: length of the @authblob message
* @conn: connection
*
*/
int ksmbd_decode_ntlmssp_neg_blob(struct negotiate_message *negblob,
int blob_len, struct ksmbd_conn *conn)
{
if (blob_len < sizeof(struct negotiate_message)) {
ksmbd_debug(AUTH, "negotiate blob len %d too small\n",
blob_len);
return -EINVAL;
}
if (memcmp(negblob->Signature, "NTLMSSP", 8)) {
ksmbd_debug(AUTH, "blob signature incorrect %s\n",
negblob->Signature);
return -EINVAL;
}
conn->ntlmssp.client_flags = le32_to_cpu(negblob->NegotiateFlags);
return 0;
}
/**
* ksmbd_build_ntlmssp_challenge_blob() - helper function to construct
* challenge blob
* @chgblob: challenge blob source pointer to initialize
* @conn: connection
*
*/
unsigned int
ksmbd_build_ntlmssp_challenge_blob(struct challenge_message *chgblob,
struct ksmbd_conn *conn)
{
struct target_info *tinfo;
wchar_t *name;
__u8 *target_name;
unsigned int flags, blob_off, blob_len, type, target_info_len = 0;
int len, uni_len, conv_len;
int cflags = conn->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;
if (cflags & NTLMSSP_NEGOTIATE_SIGN) {
flags |= NTLMSSP_NEGOTIATE_SIGN;
flags |= cflags & (NTLMSSP_NEGOTIATE_128 |
NTLMSSP_NEGOTIATE_56);
}
if (cflags & NTLMSSP_NEGOTIATE_SEAL && smb3_encryption_negotiated(conn))
flags |= NTLMSSP_NEGOTIATE_SEAL;
if (cflags & NTLMSSP_NEGOTIATE_ALWAYS_SIGN)
flags |= NTLMSSP_NEGOTIATE_ALWAYS_SIGN;
if (cflags & NTLMSSP_REQUEST_TARGET)
flags |= NTLMSSP_REQUEST_TARGET;
if (conn->use_spnego &&
(cflags & NTLMSSP_NEGOTIATE_EXTENDED_SEC))
flags |= NTLMSSP_NEGOTIATE_EXTENDED_SEC;
if (cflags & NTLMSSP_NEGOTIATE_KEY_XCH)
flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
chgblob->NegotiateFlags = cpu_to_le32(flags);
len = strlen(ksmbd_netbios_name());
name = kmalloc(2 + UNICODE_LEN(len), KSMBD_DEFAULT_GFP);
if (!name)
return -ENOMEM;
conv_len = smb_strtoUTF16((__le16 *)name, ksmbd_netbios_name(), len,
conn->local_nls);
if (conv_len < 0 || conv_len > len) {
kfree(name);
return -EINVAL;
}
uni_len = UNICODE_LEN(conv_len);
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;
}
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_login_response_ext *resp_ext = NULL;
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;
}
if (resp->login_response.status & KSMBD_USER_FLAG_EXTENSION)
resp_ext = ksmbd_ipc_login_request_ext(resp->login_response.account);
user = ksmbd_alloc_user(&resp->login_response, resp_ext);
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;
}
#ifdef CONFIG_SMB_INSECURE_SERVER
/**
* ksmbd_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 ksmbd_sign_smb1_pdu(struct ksmbd_session *sess, struct kvec *iov, int n_vec,
char *sig)
{
struct ksmbd_crypto_ctx *ctx;
int rc, i;
ctx = ksmbd_crypto_ctx_find_md5();
if (!ctx) {
ksmbd_debug(AUTH, "could not crypto alloc md5\n");
return -ENOMEM;
}
rc = crypto_shash_init(CRYPTO_MD5(ctx));
if (rc) {
ksmbd_debug(AUTH, "md5 init error %d\n", rc);
goto out;
}
rc = crypto_shash_update(CRYPTO_MD5(ctx), sess->sess_key, 40);
if (rc) {
ksmbd_debug(AUTH, "md5 update error %d\n", rc);
goto out;
}
for (i = 0; i < n_vec; i++) {
rc = crypto_shash_update(CRYPTO_MD5(ctx),
iov[i].iov_base,
iov[i].iov_len);
if (rc) {
ksmbd_debug(AUTH, "md5 update error %d\n", rc);
goto out;
}
}
rc = crypto_shash_final(CRYPTO_MD5(ctx), sig);
if (rc)
ksmbd_debug(AUTH, "md5 generation error %d\n", rc);
out:
ksmbd_release_crypto_ctx(ctx);
return rc;
}
#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;
};