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1159 lines
29 KiB
1159 lines
29 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/* |
|
* Copyright (C) 2016 Namjae Jeon <[email protected]> |
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* Copyright (C) 2018 Samsung Electronics Co., Ltd. |
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*/ |
|
|
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#include <linux/kernel.h> |
|
#include <linux/fs.h> |
|
#include <linux/uaccess.h> |
|
#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> |
|
#include <crypto/hash.h> |
|
#include <crypto/aead.h> |
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#include <linux/random.h> |
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#include <linux/scatterlist.h> |
|
|
|
#include "auth.h" |
|
#include "glob.h" |
|
|
|
#include <linux/fips.h> |
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#include <crypto/des.h> |
|
|
|
#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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* 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, |
|
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, |
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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, |
|
0x30, 0x0c, 0x06, 0x0a, 0x2b, 0x06, 0x01, 0x04, |
|
0x01, 0x82, 0x37, 0x02, 0x02, 0x0a, 0xa3, 0x2a, |
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0x30, 0x28, 0xa0, 0x26, 0x1b, 0x24, 0x6e, 0x6f, |
|
0x74, 0x5f, 0x64, 0x65, 0x66, 0x69, 0x6e, 0x65, |
|
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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memcpy(buf, NEGOTIATE_GSS_HEADER, AUTH_GSS_LENGTH); |
|
} |
|
|
|
/** |
|
* ksmbd_gen_sess_key() - function to generate session key |
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* @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 |
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* |
|
*/ |
|
static int ksmbd_gen_sess_key(struct ksmbd_session *sess, char *hash, |
|
char *hmac) |
|
{ |
|
struct ksmbd_crypto_ctx *ctx; |
|
int rc; |
|
|
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ctx = ksmbd_crypto_ctx_find_hmacmd5(); |
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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_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, |
|
sess->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, |
|
sess->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_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_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]; |
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struct ksmbd_crypto_ctx *ctx; |
|
char *construct = NULL; |
|
int rc, len; |
|
|
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ctx = ksmbd_crypto_ctx_find_hmacmd5(); |
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if (!ctx) { |
|
ksmbd_debug(AUTH, "could not crypto alloc hmacmd5\n"); |
|
return -ENOMEM; |
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} |
|
|
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rc = calc_ntlmv2_hash(sess, ntlmv2_hash, domain_name); |
|
if (rc) { |
|
ksmbd_debug(AUTH, "could not get v2 hash rc %d\n", rc); |
|
goto out; |
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} |
|
|
|
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; |
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} |
|
|
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len = CIFS_CRYPTO_KEY_SIZE + blen; |
|
construct = kzalloc(len, GFP_KERNEL); |
|
if (!construct) { |
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rc = -ENOMEM; |
|
goto out; |
|
} |
|
|
|
memcpy(construct, sess->ntlmssp.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; |
|
} |
|
|
|
/** |
|
* 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_session *sess) |
|
{ |
|
char *domain_name; |
|
unsigned int lm_off, nt_off; |
|
unsigned short nt_len; |
|
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; |
|
} |
|
|
|
lm_off = le32_to_cpu(authblob->LmChallengeResponse.BufferOffset); |
|
nt_off = le32_to_cpu(authblob->NtChallengeResponse.BufferOffset); |
|
nt_len = le16_to_cpu(authblob->NtChallengeResponse.Length); |
|
|
|
/* 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); |
|
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(sess, (struct ntlmv2_resp *)((char *)authblob + nt_off), |
|
nt_len - CIFS_ENCPWD_SIZE, |
|
domain_name); |
|
kfree(domain_name); |
|
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_session *sess) |
|
{ |
|
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; |
|
} |
|
|
|
sess->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_session *sess) |
|
{ |
|
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 = 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; |
|
|
|
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(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, |
|
sess->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(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, 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_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 (sess->conn->cipher_type == SMB2_ENCRYPTION_AES256_CCM || |
|
sess->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 (sess->conn->dialect >= SMB30_PROT_ID && signing->binding) |
|
key = chann->smb3signingkey; |
|
else |
|
key = sess->smb3signingkey; |
|
|
|
rc = generate_key(sess, signing->label, signing->context, key, |
|
SMB3_SIGN_KEY_SIZE); |
|
if (rc) |
|
return rc; |
|
|
|
if (!(sess->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_session *sess, |
|
const struct derivation_twin *ptwin) |
|
{ |
|
int rc; |
|
|
|
rc = generate_key(sess, ptwin->encryption.label, |
|
ptwin->encryption.context, sess->smb3encryptionkey, |
|
SMB3_ENC_DEC_KEY_SIZE); |
|
if (rc) |
|
return rc; |
|
|
|
rc = generate_key(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", sess->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 (sess->conn->cipher_type == SMB2_ENCRYPTION_AES256_CCM || |
|
sess->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_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(sess, &twin); |
|
} |
|
|
|
int ksmbd_gen_smb311_encryptionkey(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(sess, &twin); |
|
} |
|
|
|
int ksmbd_gen_preauth_integrity_hash(struct ksmbd_conn *conn, char *buf, |
|
__u8 *pi_hash) |
|
{ |
|
int rc; |
|
struct smb2_hdr *rcv_hdr = (struct smb2_hdr *)buf; |
|
char *all_bytes_msg = (char *)&rcv_hdr->ProtocolId; |
|
int msg_size = be32_to_cpu(rcv_hdr->smb2_buf_length); |
|
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) - 24; |
|
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 = |
|
(struct smb2_transform_hdr *)iov[0].iov_base; |
|
unsigned int assoc_data_len = sizeof(struct smb2_transform_hdr) - 24; |
|
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; |
|
}
|
|
|