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cifs: dynamic allocation of ntlmssp blob 

In sess_auth_rawntlmssp_authenticate(), the ntlmssp blob is allocated
statically and its size is an "empirical" 5*sizeof(struct
_AUTHENTICATE_MESSAGE) (320B on x86_64). I don't know where this value
comes from or if it was ever appropriate, but it is currently
insufficient: the user and domain name in UTF16 could take 1kB by
themselves. Because of that, build_ntlmssp_auth_blob() might corrupt
memory (out-of-bounds write). The size of ntlmssp_blob in
SMB2_sess_setup() is too small too (sizeof(struct _NEGOTIATE_MESSAGE)
+ 500).

This patch allocates the blob dynamically in
build_ntlmssp_auth_blob().

Signed-off-by: Jerome Marchand <jmarchan@redhat.com>
Signed-off-by: Steve French <smfrench@gmail.com>
CC: Stable <stable@vger.kernel.org>
This commit is contained in:
Jerome Marchand 2016-05-26 11:52:25 +02:00 committed by Steve French
parent 202d772ba0
commit b8da344b74
3 changed files with 45 additions and 43 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
fs/cifs/ntlmssp.h
View File

@ -133,6 +133,6 @@ typedef struct _AUTHENTICATE_MESSAGE {
int decode_ntlmssp_challenge(char *bcc_ptr, int blob_len, struct cifs_ses *ses);
void build_ntlmssp_negotiate_blob(unsigned char *pbuffer, struct cifs_ses *ses);
int build_ntlmssp_auth_blob(unsigned char *pbuffer, u16 *buflen,
int build_ntlmssp_auth_blob(unsigned char **pbuffer, u16 *buflen,
struct cifs_ses *ses,
const struct nls_table *nls_cp);

76
fs/cifs/sess.c
View File

@ -364,19 +364,43 @@ void build_ntlmssp_negotiate_blob(unsigned char *pbuffer,
sec_blob->DomainName.MaximumLength = 0;
}
/* We do not malloc the blob, it is passed in pbuffer, because its
maximum possible size is fixed and small, making this approach cleaner.
This function returns the length of the data in the blob */
int build_ntlmssp_auth_blob(unsigned char *pbuffer,
static int size_of_ntlmssp_blob(struct cifs_ses *ses)
{
int sz = sizeof(AUTHENTICATE_MESSAGE) + ses->auth_key.len
- CIFS_SESS_KEY_SIZE + CIFS_CPHTXT_SIZE + 2;
if (ses->domainName)
sz += 2 * strnlen(ses->domainName, CIFS_MAX_DOMAINNAME_LEN);
else
sz += 2;
if (ses->user_name)
sz += 2 * strnlen(ses->user_name, CIFS_MAX_USERNAME_LEN);
else
sz += 2;
return sz;
}
int build_ntlmssp_auth_blob(unsigned char **pbuffer,
u16 *buflen,
struct cifs_ses *ses,
const struct nls_table *nls_cp)
{
int rc;
AUTHENTICATE_MESSAGE *sec_blob = (AUTHENTICATE_MESSAGE *)pbuffer;
AUTHENTICATE_MESSAGE *sec_blob;
__u32 flags;
unsigned char *tmp;
rc = setup_ntlmv2_rsp(ses, nls_cp);
if (rc) {
cifs_dbg(VFS, "Error %d during NTLMSSP authentication\n", rc);
*buflen = 0;
goto setup_ntlmv2_ret;
}
*pbuffer = kmalloc(size_of_ntlmssp_blob(ses), GFP_KERNEL);
sec_blob = (AUTHENTICATE_MESSAGE *)*pbuffer;
memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
sec_blob->MessageType = NtLmAuthenticate;
@ -391,7 +415,7 @@ int build_ntlmssp_auth_blob(unsigned char *pbuffer,
flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
}
tmp = pbuffer + sizeof(AUTHENTICATE_MESSAGE);
tmp = *pbuffer + sizeof(AUTHENTICATE_MESSAGE);
sec_blob->NegotiateFlags = cpu_to_le32(flags);
sec_blob->LmChallengeResponse.BufferOffset =
@ -399,13 +423,9 @@ int build_ntlmssp_auth_blob(unsigned char *pbuffer,
sec_blob->LmChallengeResponse.Length = 0;
sec_blob->LmChallengeResponse.MaximumLength = 0;
sec_blob->NtChallengeResponse.BufferOffset = cpu_to_le32(tmp - pbuffer);
sec_blob->NtChallengeResponse.BufferOffset =
cpu_to_le32(tmp - *pbuffer);
if (ses->user_name != NULL) {
rc = setup_ntlmv2_rsp(ses, nls_cp);
if (rc) {
cifs_dbg(VFS, "Error %d during NTLMSSP authentication\n", rc);
goto setup_ntlmv2_ret;
}
memcpy(tmp, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
ses->auth_key.len - CIFS_SESS_KEY_SIZE);
tmp += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
@ -423,7 +443,7 @@ int build_ntlmssp_auth_blob(unsigned char *pbuffer,
}
if (ses->domainName == NULL) {
sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - pbuffer);
sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
sec_blob->DomainName.Length = 0;
sec_blob->DomainName.MaximumLength = 0;
tmp += 2;
@ -432,14 +452,14 @@ int build_ntlmssp_auth_blob(unsigned char *pbuffer,
len = cifs_strtoUTF16((__le16 *)tmp, ses->domainName,
CIFS_MAX_DOMAINNAME_LEN, nls_cp);
len *= 2; /* unicode is 2 bytes each */
sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - pbuffer);
sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
sec_blob->DomainName.Length = cpu_to_le16(len);
sec_blob->DomainName.MaximumLength = cpu_to_le16(len);
tmp += len;
}
if (ses->user_name == NULL) {
sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - pbuffer);
sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
sec_blob->UserName.Length = 0;
sec_blob->UserName.MaximumLength = 0;
tmp += 2;
@ -448,13 +468,13 @@ int build_ntlmssp_auth_blob(unsigned char *pbuffer,
len = cifs_strtoUTF16((__le16 *)tmp, ses->user_name,
CIFS_MAX_USERNAME_LEN, nls_cp);
len *= 2; /* unicode is 2 bytes each */
sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - pbuffer);
sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
sec_blob->UserName.Length = cpu_to_le16(len);
sec_blob->UserName.MaximumLength = cpu_to_le16(len);
tmp += len;
}
sec_blob->WorkstationName.BufferOffset = cpu_to_le32(tmp - pbuffer);
sec_blob->WorkstationName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
sec_blob->WorkstationName.Length = 0;
sec_blob->WorkstationName.MaximumLength = 0;
tmp += 2;
@ -463,19 +483,19 @@ int build_ntlmssp_auth_blob(unsigned char *pbuffer,
(ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_EXTENDED_SEC))
&& !calc_seckey(ses)) {
memcpy(tmp, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE);
sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - pbuffer);
sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - *pbuffer);
sec_blob->SessionKey.Length = cpu_to_le16(CIFS_CPHTXT_SIZE);
sec_blob->SessionKey.MaximumLength =
cpu_to_le16(CIFS_CPHTXT_SIZE);
tmp += CIFS_CPHTXT_SIZE;
} else {
sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - pbuffer);
sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - *pbuffer);
sec_blob->SessionKey.Length = 0;
sec_blob->SessionKey.MaximumLength = 0;
}
*buflen = tmp - *pbuffer;
setup_ntlmv2_ret:
*buflen = tmp - pbuffer;
return rc;
}
@ -1266,7 +1286,7 @@ sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data)
struct cifs_ses *ses = sess_data->ses;
__u16 bytes_remaining;
char *bcc_ptr;
char *ntlmsspblob = NULL;
unsigned char *ntlmsspblob = NULL;
u16 blob_len;
cifs_dbg(FYI, "rawntlmssp session setup authenticate phase\n");
@ -1279,19 +1299,7 @@ sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data)
/* Build security blob before we assemble the request */
pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
smb_buf = (struct smb_hdr *)pSMB;
/*
* 5 is an empirical value, large enough to hold
* authenticate message plus max 10 of av paris,
* domain, user, workstation names, flags, etc.
*/
ntlmsspblob = kzalloc(5*sizeof(struct _AUTHENTICATE_MESSAGE),
GFP_KERNEL);
if (!ntlmsspblob) {
rc = -ENOMEM;
goto out;
}
rc = build_ntlmssp_auth_blob(ntlmsspblob,
rc = build_ntlmssp_auth_blob(&ntlmsspblob,
&blob_len, ses, sess_data->nls_cp);
if (rc)
goto out_free_ntlmsspblob;

10
fs/cifs/smb2pdu.c
View File

@ -588,7 +588,7 @@ SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
u16 blob_length = 0;
struct key *spnego_key = NULL;
char *security_blob = NULL;
char *ntlmssp_blob = NULL;
unsigned char *ntlmssp_blob = NULL;
bool use_spnego = false; /* else use raw ntlmssp */
cifs_dbg(FYI, "Session Setup\n");
@ -713,13 +713,7 @@ SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
iov[1].iov_len = blob_length;
} else if (phase == NtLmAuthenticate) {
req->hdr.SessionId = ses->Suid;
ntlmssp_blob = kzalloc(sizeof(struct _NEGOTIATE_MESSAGE) + 500,
GFP_KERNEL);
if (ntlmssp_blob == NULL) {
rc = -ENOMEM;
goto ssetup_exit;
}
rc = build_ntlmssp_auth_blob(ntlmssp_blob, &blob_length, ses,
rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length, ses,
nls_cp);
if (rc) {
cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n",