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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>
#include <crypto/des.h>
#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] = {
#ifdef CONFIG_SMB_SERVER_KERBEROS5
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
#else
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
#endif
};
void ksmbd_copy_gss_neg_header(void *buf)
{
memcpy(buf, NEGOTIATE_GSS_HEADER, AUTH_GSS_LENGTH);
}
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;
}
#ifdef CONFIG_SMB_INSECURE_SERVER
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), GFP_KERNEL);
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), GFP_KERNEL);
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;
}
/**
* 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;
}
/**
* ksmbd_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 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;
char *construct = NULL;
int rc, len;
ctx = ksmbd_crypto_ctx_find_hmacmd5();
if (!ctx) {
ksmbd_debug(AUTH, "could not crypto alloc hmacmd5\n");
return -ENOMEM;
}
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;
}
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, GFP_KERNEL);
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;
}
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:
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
* @usr: user details
* @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;
ctx_arc4 = kmalloc(sizeof(*ctx_arc4), GFP_KERNEL);
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
* @rsp: response header pointer to be updated
* @sess: session of 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
* @rsp: response header pointer to be updated
* @sess: session of 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), GFP_KERNEL);
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;
}
#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
#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;
}