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mirror-linux/fs/smb/client/smb1session.c

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// SPDX-License-Identifier: LGPL-2.1
/*
*
* SMB/CIFS session setup handling routines
*
* Copyright (c) International Business Machines Corp., 2006, 2009
* Author(s): Steve French (sfrench@us.ibm.com)
*
*/
#include "cifsproto.h"
#include "smb1proto.h"
#include "ntlmssp.h"
#include "nterr.h"
#include "cifs_spnego.h"
#include "cifs_unicode.h"
#include "cifs_debug.h"
struct sess_data {
unsigned int xid;
struct cifs_ses *ses;
struct TCP_Server_Info *server;
struct nls_table *nls_cp;
void (*func)(struct sess_data *);
int result;
unsigned int in_len;
/* we will send the SMB in three pieces:
* a fixed length beginning part, an optional
* SPNEGO blob (which can be zero length), and a
* last part which will include the strings
* and rest of bcc area. This allows us to avoid
* a large buffer 17K allocation
*/
int buf0_type;
struct kvec iov[3];
};
static __u32 cifs_ssetup_hdr(struct cifs_ses *ses,
struct TCP_Server_Info *server,
SESSION_SETUP_ANDX *pSMB)
{
__u32 capabilities = 0;
/* init fields common to all four types of SessSetup */
/* Note that offsets for first seven fields in req struct are same */
/* in CIFS Specs so does not matter which of 3 forms of struct */
/* that we use in next few lines */
/* Note that header is initialized to zero in header_assemble */
pSMB->req.AndXCommand = 0xFF;
pSMB->req.MaxBufferSize = cpu_to_le16(min_t(u32,
CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4,
USHRT_MAX));
pSMB->req.MaxMpxCount = cpu_to_le16(server->maxReq);
pSMB->req.VcNumber = cpu_to_le16(1);
pSMB->req.SessionKey = server->session_key_id;
/* Now no need to set SMBFLG_CASELESS or obsolete CANONICAL PATH */
/* BB verify whether signing required on neg or just auth frame (and NTLM case) */
capabilities = CAP_LARGE_FILES | CAP_NT_SMBS | CAP_LEVEL_II_OPLOCKS |
CAP_LARGE_WRITE_X | CAP_LARGE_READ_X;
if (server->sign)
pSMB->req.hdr.Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
if (ses->capabilities & CAP_UNICODE) {
pSMB->req.hdr.Flags2 |= SMBFLG2_UNICODE;
capabilities |= CAP_UNICODE;
}
if (ses->capabilities & CAP_STATUS32) {
pSMB->req.hdr.Flags2 |= SMBFLG2_ERR_STATUS;
capabilities |= CAP_STATUS32;
}
if (ses->capabilities & CAP_DFS) {
pSMB->req.hdr.Flags2 |= SMBFLG2_DFS;
capabilities |= CAP_DFS;
}
if (ses->capabilities & CAP_UNIX)
capabilities |= CAP_UNIX;
return capabilities;
}
static void
unicode_oslm_strings(char **pbcc_area, const struct nls_table *nls_cp)
{
char *bcc_ptr = *pbcc_area;
int bytes_ret = 0;
/* Copy OS version */
bytes_ret = cifs_strtoUTF16((__le16 *)bcc_ptr, "Linux version ", 32,
nls_cp);
bcc_ptr += 2 * bytes_ret;
bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, init_utsname()->release,
32, nls_cp);
bcc_ptr += 2 * bytes_ret;
bcc_ptr += 2; /* trailing null */
bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, CIFS_NETWORK_OPSYS,
32, nls_cp);
bcc_ptr += 2 * bytes_ret;
bcc_ptr += 2; /* trailing null */
*pbcc_area = bcc_ptr;
}
static void
ascii_oslm_strings(char **pbcc_area, const struct nls_table *nls_cp)
{
char *bcc_ptr = *pbcc_area;
strcpy(bcc_ptr, "Linux version ");
bcc_ptr += strlen("Linux version ");
strcpy(bcc_ptr, init_utsname()->release);
bcc_ptr += strlen(init_utsname()->release) + 1;
strcpy(bcc_ptr, CIFS_NETWORK_OPSYS);
bcc_ptr += strlen(CIFS_NETWORK_OPSYS) + 1;
*pbcc_area = bcc_ptr;
}
static void unicode_domain_string(char **pbcc_area, struct cifs_ses *ses,
const struct nls_table *nls_cp)
{
char *bcc_ptr = *pbcc_area;
int bytes_ret = 0;
/* copy domain */
if (ses->domainName == NULL) {
/*
* Sending null domain better than using a bogus domain name (as
* we did briefly in 2.6.18) since server will use its default
*/
*bcc_ptr = 0;
*(bcc_ptr+1) = 0;
bytes_ret = 0;
} else
bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->domainName,
CIFS_MAX_DOMAINNAME_LEN, nls_cp);
bcc_ptr += 2 * bytes_ret;
bcc_ptr += 2; /* account for null terminator */
*pbcc_area = bcc_ptr;
}
static void ascii_domain_string(char **pbcc_area, struct cifs_ses *ses,
const struct nls_table *nls_cp)
{
char *bcc_ptr = *pbcc_area;
int len;
/* copy domain */
if (ses->domainName != NULL) {
len = strscpy(bcc_ptr, ses->domainName, CIFS_MAX_DOMAINNAME_LEN);
if (WARN_ON_ONCE(len < 0))
len = CIFS_MAX_DOMAINNAME_LEN - 1;
bcc_ptr += len;
} /* else we send a null domain name so server will default to its own domain */
*bcc_ptr = 0;
bcc_ptr++;
*pbcc_area = bcc_ptr;
}
static void unicode_ssetup_strings(char **pbcc_area, struct cifs_ses *ses,
const struct nls_table *nls_cp)
{
char *bcc_ptr = *pbcc_area;
int bytes_ret = 0;
/* BB FIXME add check that strings less than 335 or will need to send as arrays */
/* copy user */
if (ses->user_name == NULL) {
/* null user mount */
*bcc_ptr = 0;
*(bcc_ptr+1) = 0;
} else {
bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->user_name,
CIFS_MAX_USERNAME_LEN, nls_cp);
}
bcc_ptr += 2 * bytes_ret;
bcc_ptr += 2; /* account for null termination */
unicode_domain_string(&bcc_ptr, ses, nls_cp);
unicode_oslm_strings(&bcc_ptr, nls_cp);
*pbcc_area = bcc_ptr;
}
static void ascii_ssetup_strings(char **pbcc_area, struct cifs_ses *ses,
const struct nls_table *nls_cp)
{
char *bcc_ptr = *pbcc_area;
int len;
/* copy user */
/* BB what about null user mounts - check that we do this BB */
/* copy user */
if (ses->user_name != NULL) {
len = strscpy(bcc_ptr, ses->user_name, CIFS_MAX_USERNAME_LEN);
if (WARN_ON_ONCE(len < 0))
len = CIFS_MAX_USERNAME_LEN - 1;
bcc_ptr += len;
}
/* else null user mount */
*bcc_ptr = 0;
bcc_ptr++; /* account for null termination */
/* BB check for overflow here */
ascii_domain_string(&bcc_ptr, ses, nls_cp);
ascii_oslm_strings(&bcc_ptr, nls_cp);
*pbcc_area = bcc_ptr;
}
static void
decode_unicode_ssetup(char **pbcc_area, int bleft, struct cifs_ses *ses,
const struct nls_table *nls_cp)
{
int len;
char *data = *pbcc_area;
cifs_dbg(FYI, "bleft %d\n", bleft);
kfree(ses->serverOS);
ses->serverOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
cifs_dbg(FYI, "serverOS=%s\n", ses->serverOS);
len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2;
data += len;
bleft -= len;
if (bleft <= 0)
return;
kfree(ses->serverNOS);
ses->serverNOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
cifs_dbg(FYI, "serverNOS=%s\n", ses->serverNOS);
len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2;
data += len;
bleft -= len;
if (bleft <= 0)
return;
kfree(ses->serverDomain);
ses->serverDomain = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
cifs_dbg(FYI, "serverDomain=%s\n", ses->serverDomain);
return;
}
static void decode_ascii_ssetup(char **pbcc_area, __u16 bleft,
struct cifs_ses *ses,
const struct nls_table *nls_cp)
{
int len;
char *bcc_ptr = *pbcc_area;
cifs_dbg(FYI, "decode sessetup ascii. bleft %d\n", bleft);
len = strnlen(bcc_ptr, bleft);
if (len >= bleft)
return;
kfree(ses->serverOS);
ses->serverOS = kmalloc(len + 1, GFP_KERNEL);
if (ses->serverOS) {
memcpy(ses->serverOS, bcc_ptr, len);
ses->serverOS[len] = 0;
if (strncmp(ses->serverOS, "OS/2", 4) == 0)
cifs_dbg(FYI, "OS/2 server\n");
}
bcc_ptr += len + 1;
bleft -= len + 1;
len = strnlen(bcc_ptr, bleft);
if (len >= bleft)
return;
kfree(ses->serverNOS);
ses->serverNOS = kmalloc(len + 1, GFP_KERNEL);
if (ses->serverNOS) {
memcpy(ses->serverNOS, bcc_ptr, len);
ses->serverNOS[len] = 0;
}
bcc_ptr += len + 1;
bleft -= len + 1;
len = strnlen(bcc_ptr, bleft);
if (len > bleft)
return;
/*
* No domain field in LANMAN case. Domain is
* returned by old servers in the SMB negprot response
*
* BB For newer servers which do not support Unicode,
* but thus do return domain here, we could add parsing
* for it later, but it is not very important
*/
cifs_dbg(FYI, "ascii: bytes left %d\n", bleft);
}
static int
sess_alloc_buffer(struct sess_data *sess_data, int wct)
{
int rc;
struct cifs_ses *ses = sess_data->ses;
struct smb_hdr *smb_buf;
rc = small_smb_init_no_tc(SMB_COM_SESSION_SETUP_ANDX, wct, ses,
(void **)&smb_buf);
if (rc < 0)
return rc;
sess_data->in_len = rc;
sess_data->iov[0].iov_base = (char *)smb_buf;
sess_data->iov[0].iov_len = sess_data->in_len;
/*
* This variable will be used to clear the buffer
* allocated above in case of any error in the calling function.
*/
sess_data->buf0_type = CIFS_SMALL_BUFFER;
/* 2000 big enough to fit max user, domain, NOS name etc. */
sess_data->iov[2].iov_base = kmalloc(2000, GFP_KERNEL);
if (!sess_data->iov[2].iov_base) {
rc = -ENOMEM;
goto out_free_smb_buf;
}
return 0;
out_free_smb_buf:
cifs_small_buf_release(smb_buf);
sess_data->iov[0].iov_base = NULL;
sess_data->iov[0].iov_len = 0;
sess_data->buf0_type = CIFS_NO_BUFFER;
return rc;
}
static void
sess_free_buffer(struct sess_data *sess_data)
{
struct kvec *iov = sess_data->iov;
/*
* Zero the session data before freeing, as it might contain sensitive info (keys, etc).
* Note that iov[1] is already freed by caller.
*/
if (sess_data->buf0_type != CIFS_NO_BUFFER && iov[0].iov_base)
memzero_explicit(iov[0].iov_base, iov[0].iov_len);
free_rsp_buf(sess_data->buf0_type, iov[0].iov_base);
sess_data->buf0_type = CIFS_NO_BUFFER;
kfree_sensitive(iov[2].iov_base);
}
static int
sess_establish_session(struct sess_data *sess_data)
{
struct cifs_ses *ses = sess_data->ses;
struct TCP_Server_Info *server = sess_data->server;
cifs_server_lock(server);
if (!server->session_estab) {
if (server->sign) {
server->session_key.response =
kmemdup(ses->auth_key.response,
ses->auth_key.len, GFP_KERNEL);
if (!server->session_key.response) {
cifs_server_unlock(server);
return -ENOMEM;
}
server->session_key.len =
ses->auth_key.len;
}
server->sequence_number = 0x2;
server->session_estab = true;
}
cifs_server_unlock(server);
cifs_dbg(FYI, "CIFS session established successfully\n");
return 0;
}
static int
sess_sendreceive(struct sess_data *sess_data)
{
int rc;
struct smb_hdr *smb_buf = (struct smb_hdr *) sess_data->iov[0].iov_base;
__u16 count;
struct kvec rsp_iov = { NULL, 0 };
count = sess_data->iov[1].iov_len + sess_data->iov[2].iov_len;
sess_data->in_len += count;
put_bcc(count, smb_buf);
rc = SendReceive2(sess_data->xid, sess_data->ses,
sess_data->iov, 3 /* num_iovecs */,
&sess_data->buf0_type,
CIFS_LOG_ERROR, &rsp_iov);
cifs_small_buf_release(sess_data->iov[0].iov_base);
memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
return rc;
}
static void
sess_auth_ntlmv2(struct sess_data *sess_data)
{
int rc = 0;
struct smb_hdr *smb_buf;
SESSION_SETUP_ANDX *pSMB;
char *bcc_ptr;
struct cifs_ses *ses = sess_data->ses;
struct TCP_Server_Info *server = sess_data->server;
__u32 capabilities;
__u16 bytes_remaining;
/* old style NTLM sessionsetup */
/* wct = 13 */
rc = sess_alloc_buffer(sess_data, 13);
if (rc)
goto out;
pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
bcc_ptr = sess_data->iov[2].iov_base;
capabilities = cifs_ssetup_hdr(ses, server, pSMB);
pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
/* LM2 password would be here if we supported it */
pSMB->req_no_secext.CaseInsensitivePasswordLength = 0;
if (ses->user_name != NULL) {
/* calculate nlmv2 response and session key */
rc = setup_ntlmv2_rsp(ses, sess_data->nls_cp);
if (rc) {
cifs_dbg(VFS, "Error %d during NTLMv2 authentication\n", rc);
goto out;
}
memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
ses->auth_key.len - CIFS_SESS_KEY_SIZE);
bcc_ptr += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
/* set case sensitive password length after tilen may get
* assigned, tilen is 0 otherwise.
*/
pSMB->req_no_secext.CaseSensitivePasswordLength =
cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
} else {
pSMB->req_no_secext.CaseSensitivePasswordLength = 0;
}
if (ses->capabilities & CAP_UNICODE) {
if (!IS_ALIGNED(sess_data->iov[0].iov_len, 2)) {
*bcc_ptr = 0;
bcc_ptr++;
}
unicode_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
} else {
ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
}
sess_data->iov[2].iov_len = (long) bcc_ptr -
(long) sess_data->iov[2].iov_base;
rc = sess_sendreceive(sess_data);
if (rc)
goto out;
pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
if (smb_buf->WordCount != 3) {
rc = smb_EIO1(smb_eio_trace_sess_nl2_wcc, smb_buf->WordCount);
cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
goto out;
}
if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
bytes_remaining = get_bcc(smb_buf);
bcc_ptr = pByteArea(smb_buf);
/* BB check if Unicode and decode strings */
if (bytes_remaining == 0) {
/* no string area to decode, do nothing */
} else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
/* unicode string area must be word-aligned */
if (!IS_ALIGNED((unsigned long)bcc_ptr - (unsigned long)smb_buf, 2)) {
++bcc_ptr;
--bytes_remaining;
}
decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
sess_data->nls_cp);
} else {
decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
sess_data->nls_cp);
}
rc = sess_establish_session(sess_data);
out:
sess_data->result = rc;
sess_data->func = NULL;
sess_free_buffer(sess_data);
kfree_sensitive(ses->auth_key.response);
ses->auth_key.response = NULL;
}
#ifdef CONFIG_CIFS_UPCALL
static void
sess_auth_kerberos(struct sess_data *sess_data)
{
int rc = 0;
struct smb_hdr *smb_buf;
SESSION_SETUP_ANDX *pSMB;
char *bcc_ptr;
struct cifs_ses *ses = sess_data->ses;
struct TCP_Server_Info *server = sess_data->server;
__u32 capabilities;
__u16 bytes_remaining;
struct key *spnego_key = NULL;
struct cifs_spnego_msg *msg;
u16 blob_len;
/* extended security */
/* wct = 12 */
rc = sess_alloc_buffer(sess_data, 12);
if (rc)
goto out;
pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
bcc_ptr = sess_data->iov[2].iov_base;
capabilities = cifs_ssetup_hdr(ses, server, pSMB);
spnego_key = cifs_get_spnego_key(ses, server);
if (IS_ERR(spnego_key)) {
rc = PTR_ERR(spnego_key);
spnego_key = NULL;
goto out;
}
msg = spnego_key->payload.data[0];
/*
* check version field to make sure that cifs.upcall is
* sending us a response in an expected form
*/
if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
cifs_dbg(VFS, "incorrect version of cifs.upcall (expected %d but got %d)\n",
CIFS_SPNEGO_UPCALL_VERSION, msg->version);
rc = -EKEYREJECTED;
goto out_put_spnego_key;
}
kfree_sensitive(ses->auth_key.response);
ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
GFP_KERNEL);
if (!ses->auth_key.response) {
cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory\n",
msg->sesskey_len);
rc = -ENOMEM;
goto out_put_spnego_key;
}
ses->auth_key.len = msg->sesskey_len;
pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
capabilities |= CAP_EXTENDED_SECURITY;
pSMB->req.Capabilities = cpu_to_le32(capabilities);
sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
sess_data->iov[1].iov_len = msg->secblob_len;
pSMB->req.SecurityBlobLength = cpu_to_le16(sess_data->iov[1].iov_len);
if (pSMB->req.hdr.Flags2 & SMBFLG2_UNICODE) {
/* unicode strings must be word aligned */
if (!IS_ALIGNED(sess_data->iov[0].iov_len + sess_data->iov[1].iov_len, 2)) {
*bcc_ptr = 0;
bcc_ptr++;
}
unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp);
unicode_domain_string(&bcc_ptr, ses, sess_data->nls_cp);
} else {
ascii_oslm_strings(&bcc_ptr, sess_data->nls_cp);
ascii_domain_string(&bcc_ptr, ses, sess_data->nls_cp);
}
sess_data->iov[2].iov_len = (long) bcc_ptr -
(long) sess_data->iov[2].iov_base;
rc = sess_sendreceive(sess_data);
if (rc)
goto out_put_spnego_key;
pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
if (smb_buf->WordCount != 4) {
rc = smb_EIO1(smb_eio_trace_sess_krb_wcc, smb_buf->WordCount);
cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
goto out_put_spnego_key;
}
if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
bytes_remaining = get_bcc(smb_buf);
bcc_ptr = pByteArea(smb_buf);
blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
if (blob_len > bytes_remaining) {
cifs_dbg(VFS, "bad security blob length %d\n",
blob_len);
rc = -EINVAL;
goto out_put_spnego_key;
}
bcc_ptr += blob_len;
bytes_remaining -= blob_len;
/* BB check if Unicode and decode strings */
if (bytes_remaining == 0) {
/* no string area to decode, do nothing */
} else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
/* unicode string area must be word-aligned */
if (!IS_ALIGNED((unsigned long)bcc_ptr - (unsigned long)smb_buf, 2)) {
++bcc_ptr;
--bytes_remaining;
}
decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
sess_data->nls_cp);
} else {
decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
sess_data->nls_cp);
}
rc = sess_establish_session(sess_data);
out_put_spnego_key:
key_invalidate(spnego_key);
key_put(spnego_key);
out:
sess_data->result = rc;
sess_data->func = NULL;
sess_free_buffer(sess_data);
kfree_sensitive(ses->auth_key.response);
ses->auth_key.response = NULL;
}
#endif /* ! CONFIG_CIFS_UPCALL */
/*
* The required kvec buffers have to be allocated before calling this
* function.
*/
static int
_sess_auth_rawntlmssp_assemble_req(struct sess_data *sess_data)
{
SESSION_SETUP_ANDX *pSMB;
struct cifs_ses *ses = sess_data->ses;
struct TCP_Server_Info *server = sess_data->server;
__u32 capabilities;
char *bcc_ptr;
pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
capabilities = cifs_ssetup_hdr(ses, server, pSMB);
pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
capabilities |= CAP_EXTENDED_SECURITY;
pSMB->req.Capabilities |= cpu_to_le32(capabilities);
bcc_ptr = sess_data->iov[2].iov_base;
if (pSMB->req.hdr.Flags2 & SMBFLG2_UNICODE) {
/* unicode strings must be word aligned */
if (!IS_ALIGNED(sess_data->iov[0].iov_len + sess_data->iov[1].iov_len, 2)) {
*bcc_ptr = 0;
bcc_ptr++;
}
unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp);
} else {
ascii_oslm_strings(&bcc_ptr, sess_data->nls_cp);
}
sess_data->iov[2].iov_len = (long) bcc_ptr -
(long) sess_data->iov[2].iov_base;
return 0;
}
static void
sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data);
static void
sess_auth_rawntlmssp_negotiate(struct sess_data *sess_data)
{
int rc;
struct smb_hdr *smb_buf;
SESSION_SETUP_ANDX *pSMB;
struct cifs_ses *ses = sess_data->ses;
struct TCP_Server_Info *server = sess_data->server;
__u16 bytes_remaining;
char *bcc_ptr;
unsigned char *ntlmsspblob = NULL;
u16 blob_len;
cifs_dbg(FYI, "rawntlmssp session setup negotiate phase\n");
/*
* if memory allocation is successful, caller of this function
* frees it.
*/
ses->ntlmssp = kmalloc_obj(struct ntlmssp_auth);
if (!ses->ntlmssp) {
rc = -ENOMEM;
goto out;
}
ses->ntlmssp->sesskey_per_smbsess = false;
/* wct = 12 */
rc = sess_alloc_buffer(sess_data, 12);
if (rc)
goto out;
pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
/* Build security blob before we assemble the request */
rc = build_ntlmssp_negotiate_blob(&ntlmsspblob,
&blob_len, ses, server,
sess_data->nls_cp);
if (rc)
goto out_free_ntlmsspblob;
sess_data->iov[1].iov_len = blob_len;
sess_data->iov[1].iov_base = ntlmsspblob;
pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len);
rc = _sess_auth_rawntlmssp_assemble_req(sess_data);
if (rc)
goto out_free_ntlmsspblob;
rc = sess_sendreceive(sess_data);
pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
/* If true, rc here is expected and not an error */
if (sess_data->buf0_type != CIFS_NO_BUFFER &&
smb_buf->Status.CifsError ==
cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED))
rc = 0;
if (rc)
goto out_free_ntlmsspblob;
cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
if (smb_buf->WordCount != 4) {
rc = smb_EIO1(smb_eio_trace_sess_rawnl_neg_wcc, smb_buf->WordCount);
cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
goto out_free_ntlmsspblob;
}
ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
bytes_remaining = get_bcc(smb_buf);
bcc_ptr = pByteArea(smb_buf);
blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
if (blob_len > bytes_remaining) {
cifs_dbg(VFS, "bad security blob length %d\n",
blob_len);
rc = -EINVAL;
goto out_free_ntlmsspblob;
}
rc = decode_ntlmssp_challenge(bcc_ptr, blob_len, ses);
out_free_ntlmsspblob:
kfree_sensitive(ntlmsspblob);
out:
sess_free_buffer(sess_data);
if (!rc) {
sess_data->func = sess_auth_rawntlmssp_authenticate;
return;
}
/* Else error. Cleanup */
kfree_sensitive(ses->auth_key.response);
ses->auth_key.response = NULL;
kfree_sensitive(ses->ntlmssp);
ses->ntlmssp = NULL;
sess_data->func = NULL;
sess_data->result = rc;
}
static void
sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data)
{
int rc;
struct smb_hdr *smb_buf;
SESSION_SETUP_ANDX *pSMB;
struct cifs_ses *ses = sess_data->ses;
struct TCP_Server_Info *server = sess_data->server;
__u16 bytes_remaining;
char *bcc_ptr;
unsigned char *ntlmsspblob = NULL;
u16 blob_len;
cifs_dbg(FYI, "rawntlmssp session setup authenticate phase\n");
/* wct = 12 */
rc = sess_alloc_buffer(sess_data, 12);
if (rc)
goto out;
/* Build security blob before we assemble the request */
pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
smb_buf = (struct smb_hdr *)pSMB;
rc = build_ntlmssp_auth_blob(&ntlmsspblob,
&blob_len, ses, server,
sess_data->nls_cp);
if (rc)
goto out_free_ntlmsspblob;
sess_data->iov[1].iov_len = blob_len;
sess_data->iov[1].iov_base = ntlmsspblob;
pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len);
/*
* Make sure that we tell the server that we are using
* the uid that it just gave us back on the response
* (challenge)
*/
smb_buf->Uid = ses->Suid;
rc = _sess_auth_rawntlmssp_assemble_req(sess_data);
if (rc)
goto out_free_ntlmsspblob;
rc = sess_sendreceive(sess_data);
if (rc)
goto out_free_ntlmsspblob;
pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
if (smb_buf->WordCount != 4) {
rc = smb_EIO1(smb_eio_trace_sess_rawnl_auth_wcc, smb_buf->WordCount);
cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
goto out_free_ntlmsspblob;
}
if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
if (ses->Suid != smb_buf->Uid) {
ses->Suid = smb_buf->Uid;
cifs_dbg(FYI, "UID changed! new UID = %llu\n", ses->Suid);
}
bytes_remaining = get_bcc(smb_buf);
bcc_ptr = pByteArea(smb_buf);
blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
if (blob_len > bytes_remaining) {
cifs_dbg(VFS, "bad security blob length %d\n",
blob_len);
rc = -EINVAL;
goto out_free_ntlmsspblob;
}
bcc_ptr += blob_len;
bytes_remaining -= blob_len;
/* BB check if Unicode and decode strings */
if (bytes_remaining == 0) {
/* no string area to decode, do nothing */
} else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
/* unicode string area must be word-aligned */
if (!IS_ALIGNED((unsigned long)bcc_ptr - (unsigned long)smb_buf, 2)) {
++bcc_ptr;
--bytes_remaining;
}
decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
sess_data->nls_cp);
} else {
decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
sess_data->nls_cp);
}
out_free_ntlmsspblob:
kfree_sensitive(ntlmsspblob);
out:
sess_free_buffer(sess_data);
if (!rc)
rc = sess_establish_session(sess_data);
/* Cleanup */
kfree_sensitive(ses->auth_key.response);
ses->auth_key.response = NULL;
kfree_sensitive(ses->ntlmssp);
ses->ntlmssp = NULL;
sess_data->func = NULL;
sess_data->result = rc;
}
static int select_sec(struct sess_data *sess_data)
{
int type;
struct cifs_ses *ses = sess_data->ses;
struct TCP_Server_Info *server = sess_data->server;
type = cifs_select_sectype(server, ses->sectype);
cifs_dbg(FYI, "sess setup type %d\n", type);
if (type == Unspecified) {
cifs_dbg(VFS, "Unable to select appropriate authentication method!\n");
return -EINVAL;
}
switch (type) {
case NTLMv2:
sess_data->func = sess_auth_ntlmv2;
break;
case Kerberos:
#ifdef CONFIG_CIFS_UPCALL
sess_data->func = sess_auth_kerberos;
break;
#else
cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
return -ENOSYS;
#endif /* CONFIG_CIFS_UPCALL */
case RawNTLMSSP:
sess_data->func = sess_auth_rawntlmssp_negotiate;
break;
default:
cifs_dbg(VFS, "secType %d not supported!\n", type);
return -ENOSYS;
}
return 0;
}
int CIFS_SessSetup(const unsigned int xid, struct cifs_ses *ses,
struct TCP_Server_Info *server,
const struct nls_table *nls_cp)
{
int rc = 0;
struct sess_data *sess_data;
if (ses == NULL) {
WARN(1, "%s: ses == NULL!", __func__);
return -EINVAL;
}
sess_data = kzalloc_obj(struct sess_data);
if (!sess_data)
return -ENOMEM;
sess_data->xid = xid;
sess_data->ses = ses;
sess_data->server = server;
sess_data->buf0_type = CIFS_NO_BUFFER;
sess_data->nls_cp = (struct nls_table *) nls_cp;
rc = select_sec(sess_data);
if (rc)
goto out;
while (sess_data->func)
sess_data->func(sess_data);
/* Store result before we free sess_data */
rc = sess_data->result;
out:
kfree_sensitive(sess_data);
return rc;
}
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