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@@ -0,0 +1,511 @@
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+/*
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+ * fs/cifs/sess.c
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+ *
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+ * SMB/CIFS session setup handling routines
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+ *
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+ * Copyright (c) International Business Machines Corp., 2006
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+ * Author(s): Steve French (sfrench@us.ibm.com)
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+ *
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+ * This library is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU Lesser General Public License as published
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+ * by the Free Software Foundation; either version 2.1 of the License, or
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+ * (at your option) any later version.
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+ *
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+ * This library is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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+ * the GNU Lesser General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU Lesser General Public License
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+ * along with this library; if not, write to the Free Software
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+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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+ */
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+
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+#include "cifspdu.h"
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+#include "cifsglob.h"
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+#include "cifsproto.h"
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+#include "cifs_unicode.h"
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+#include "cifs_debug.h"
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+#include "ntlmssp.h"
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+#include "nterr.h"
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+#include <linux/ctype.h>
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+
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+extern void SMBencrypt(unsigned char *passwd, unsigned char *c8,
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+ unsigned char *p24);
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+
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+extern void SMBNTencrypt(unsigned char *passwd, unsigned char *c8,
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+ unsigned char *p24);
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+
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+#ifdef CONFIG_CIFS_EXPERIMENTAL
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+
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+static __u32 cifs_ssetup_hdr(struct cifsSesInfo *ses, SESSION_SETUP_ANDX *pSMB)
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+{
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+ __u32 capabilities = 0;
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+
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+ /* init fields common to all four types of SessSetup */
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+ /* note that header is initialized to zero in header_assemble */
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+ pSMB->req.AndXCommand = 0xFF;
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+ pSMB->req.MaxBufferSize = cpu_to_le16(ses->server->maxBuf);
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+ pSMB->req.MaxMpxCount = cpu_to_le16(ses->server->maxReq);
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+
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+ /* Now no need to set SMBFLG_CASELESS or obsolete CANONICAL PATH */
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+
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+ /* BB verify whether signing required on neg or just on auth frame
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+ (and NTLM case) */
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+
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+ capabilities = CAP_LARGE_FILES | CAP_NT_SMBS | CAP_LEVEL_II_OPLOCKS |
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+ CAP_LARGE_WRITE_X | CAP_LARGE_READ_X;
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+
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+ if(ses->server->secMode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
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+ pSMB->req.hdr.Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
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+
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+ if (ses->capabilities & CAP_UNICODE) {
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+ pSMB->req.hdr.Flags2 |= SMBFLG2_UNICODE;
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+ capabilities |= CAP_UNICODE;
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+ }
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+ if (ses->capabilities & CAP_STATUS32) {
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+ pSMB->req.hdr.Flags2 |= SMBFLG2_ERR_STATUS;
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+ capabilities |= CAP_STATUS32;
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+ }
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+ if (ses->capabilities & CAP_DFS) {
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+ pSMB->req.hdr.Flags2 |= SMBFLG2_DFS;
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+ capabilities |= CAP_DFS;
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+ }
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+ if (ses->capabilities & CAP_UNIX) {
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+ capabilities |= CAP_UNIX;
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+ }
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+
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+ /* BB check whether to init vcnum BB */
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+ return capabilities;
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+}
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+
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+void unicode_ssetup_strings(char ** pbcc_area, struct cifsSesInfo *ses,
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+ const struct nls_table * nls_cp)
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+{
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+ char * bcc_ptr = *pbcc_area;
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+ int bytes_ret = 0;
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+
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+ /* BB FIXME add check that strings total less
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+ than 335 or will need to send them as arrays */
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+
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+ /* align unicode strings, must be word aligned */
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+ if ((long) bcc_ptr % 2) {
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+ *bcc_ptr = 0;
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+ bcc_ptr++;
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+ }
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+ /* copy user */
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+ if(ses->userName == NULL) {
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+ /* BB what about null user mounts - check that we do this BB */
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+ } else { /* 300 should be long enough for any conceivable user name */
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+ bytes_ret = cifs_strtoUCS((__le16 *) bcc_ptr, ses->userName,
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+ 300, nls_cp);
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+ }
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+ bcc_ptr += 2 * bytes_ret;
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+ bcc_ptr += 2; /* account for null termination */
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+ /* copy domain */
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+ if(ses->domainName == NULL)
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+ bytes_ret = cifs_strtoUCS((__le16 *) bcc_ptr,
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+ "CIFS_LINUX_DOM", 32, nls_cp);
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+ else
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+ bytes_ret = cifs_strtoUCS((__le16 *) bcc_ptr, ses->domainName,
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+ 256, nls_cp);
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+ bcc_ptr += 2 * bytes_ret;
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+ bcc_ptr += 2; /* account for null terminator */
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+
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+ /* Copy OS version */
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+ bytes_ret = cifs_strtoUCS((__le16 *)bcc_ptr, "Linux version ", 32,
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+ nls_cp);
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+ bcc_ptr += 2 * bytes_ret;
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+ bytes_ret = cifs_strtoUCS((__le16 *) bcc_ptr, system_utsname.release,
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+ 32, nls_cp);
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+ bcc_ptr += 2 * bytes_ret;
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+ bcc_ptr += 2; /* trailing null */
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+
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+ bytes_ret = cifs_strtoUCS((__le16 *) bcc_ptr, CIFS_NETWORK_OPSYS,
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+ 32, nls_cp);
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+ bcc_ptr += 2 * bytes_ret;
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+ bcc_ptr += 2; /* trailing null */
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+
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+ *pbcc_area = bcc_ptr;
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+}
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+
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+void ascii_ssetup_strings(char ** pbcc_area, struct cifsSesInfo *ses,
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+ const struct nls_table * nls_cp)
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+{
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+ char * bcc_ptr = *pbcc_area;
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+
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+ /* copy user */
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+ /* BB what about null user mounts - check that we do this BB */
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+ /* copy user */
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+ if(ses->userName == NULL) {
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+ /* BB what about null user mounts - check that we do this BB */
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+ } else { /* 300 should be long enough for any conceivable user name */
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+ strncpy(bcc_ptr, ses->userName, 300);
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+ }
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+ /* BB improve check for overflow */
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+ bcc_ptr += strnlen(ses->userName, 200);
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+ *bcc_ptr = 0;
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+ bcc_ptr++; /* account for null termination */
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+
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+ /* copy domain */
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+
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+ if(ses->domainName == NULL) {
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+ strcpy(bcc_ptr, "CIFS_LINUX_DOM");
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+ bcc_ptr += 14; /* strlen(CIFS_LINUX_DOM) */
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+ } else {
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+ strncpy(bcc_ptr, ses->domainName, 256);
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+ bcc_ptr += strnlen(ses->domainName, 256);
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+ }
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+ *bcc_ptr = 0;
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+ bcc_ptr++;
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+
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+ /* BB check for overflow here */
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+
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+ strcpy(bcc_ptr, "Linux version ");
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+ bcc_ptr += strlen("Linux version ");
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+ strcpy(bcc_ptr, system_utsname.release);
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+ bcc_ptr += strlen(system_utsname.release) + 1;
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+
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+ strcpy(bcc_ptr, CIFS_NETWORK_OPSYS);
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+ bcc_ptr += strlen(CIFS_NETWORK_OPSYS) + 1;
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+
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+ *pbcc_area = bcc_ptr;
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+}
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+
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+int decode_unicode_ssetup(char ** pbcc_area, int bleft, struct cifsSesInfo *ses,
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+ const struct nls_table * nls_cp)
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+{
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+ int rc = 0;
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+ int words_left, len;
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+ char * data = *pbcc_area;
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+
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+
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+
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+ cFYI(1,("bleft %d",bleft));
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+
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+
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+ /* word align, if bytes remaining is not even */
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+ if(bleft % 2) {
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+ bleft--;
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+ data++;
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+ }
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+ words_left = bleft / 2;
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+
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+ /* save off server operating system */
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+ len = UniStrnlen((wchar_t *) data, words_left);
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+
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+/* We look for obvious messed up bcc or strings in response so we do not go off
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+ the end since (at least) WIN2K and Windows XP have a major bug in not null
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+ terminating last Unicode string in response */
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+ if(len >= words_left)
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+ return rc;
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+
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+ if(ses->serverOS)
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+ kfree(ses->serverOS);
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+ /* UTF-8 string will not grow more than four times as big as UCS-16 */
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+ ses->serverOS = kzalloc(4 * len, GFP_KERNEL);
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+ if(ses->serverOS != NULL) {
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+ cifs_strfromUCS_le(ses->serverOS, (__le16 *)data, len,
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+ nls_cp);
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+ }
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+ data += 2 * (len + 1);
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+ words_left -= len + 1;
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+
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+ /* save off server network operating system */
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+ len = UniStrnlen((wchar_t *) data, words_left);
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+
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+ if(len >= words_left)
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+ return rc;
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+
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+ if(ses->serverNOS)
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+ kfree(ses->serverNOS);
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+ ses->serverNOS = kzalloc(4 * len, GFP_KERNEL); /* BB this is wrong length FIXME BB */
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+ if(ses->serverNOS != NULL) {
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+ cifs_strfromUCS_le(ses->serverNOS, (__le16 *)data, len,
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+ nls_cp);
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+ if(strncmp(ses->serverNOS, "NT LAN Manager 4",16) == 0) {
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+ cFYI(1,("NT4 server"));
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+ ses->flags |= CIFS_SES_NT4;
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+ }
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+ }
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+ data += 2 * (len + 1);
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+ words_left -= len + 1;
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+
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+ /* save off server domain */
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+ len = UniStrnlen((wchar_t *) data, words_left);
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+
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+ if(len > words_left)
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+ return rc;
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+
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+ if(ses->serverDomain)
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+ kfree(ses->serverDomain);
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+ ses->serverDomain = kzalloc(2 * (len + 1), GFP_KERNEL); /* BB FIXME wrong length */
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+ if(ses->serverDomain != NULL) {
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+ cifs_strfromUCS_le(ses->serverDomain, (__le16 *)data, len,
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+ nls_cp);
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+ ses->serverDomain[2*len] = 0;
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+ ses->serverDomain[(2*len) + 1] = 0;
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+ }
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+ data += 2 * (len + 1);
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+ words_left -= len + 1;
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+
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+ cFYI(1,("words left: %d",words_left));
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+
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+ return rc;
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+}
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+
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+int decode_ascii_ssetup(char ** pbcc_area, int bleft, struct cifsSesInfo *ses,
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+ const struct nls_table * nls_cp)
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+{
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+ int rc = 0;
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+ int len;
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+ char * bcc_ptr = *pbcc_area;
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+
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+ cFYI(1,("decode sessetup ascii. bleft %d", bleft));
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+
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+ len = strnlen(bcc_ptr, bleft);
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+ if(len >= bleft)
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+ return rc;
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+
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+ if(ses->serverOS)
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+ kfree(ses->serverOS);
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+
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+ ses->serverOS = kzalloc(len + 1, GFP_KERNEL);
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+ if(ses->serverOS)
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+ strncpy(ses->serverOS, bcc_ptr, len);
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+
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+ bcc_ptr += len + 1;
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+ bleft -= len + 1;
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+
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+ len = strnlen(bcc_ptr, bleft);
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+ if(len >= bleft)
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+ return rc;
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+
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+ if(ses->serverNOS)
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+ kfree(ses->serverNOS);
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+
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+ ses->serverNOS = kzalloc(len + 1, GFP_KERNEL);
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+ if(ses->serverNOS)
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+ strncpy(ses->serverNOS, bcc_ptr, len);
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+
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+ bcc_ptr += len + 1;
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+ bleft -= len + 1;
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+
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+ len = strnlen(bcc_ptr, bleft);
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+ if(len > bleft)
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+ return rc;
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+
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+ if(ses->serverDomain)
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+ kfree(ses->serverDomain);
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+
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+ ses->serverDomain = kzalloc(len + 1, GFP_KERNEL);
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+ if(ses->serverOS)
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+ strncpy(ses->serverOS, bcc_ptr, len);
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+
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+ bcc_ptr += len + 1;
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+ bleft -= len + 1;
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+
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+ cFYI(1,("ascii: bytes left %d",bleft));
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+
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+ return rc;
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+}
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+
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+int
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+CIFS_SessSetup(unsigned int xid, struct cifsSesInfo *ses, int first_time,
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+ const struct nls_table *nls_cp)
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+{
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+ int rc = 0;
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+ int wct;
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+ int i;
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+ struct smb_hdr *smb_buf;
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+ char *bcc_ptr;
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+ SESSION_SETUP_ANDX *pSMB;
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+ __u32 capabilities;
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+ int count;
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+ int resp_buf_type = 0;
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+ struct kvec iov[1];
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+ enum securityEnum type;
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+ __u16 action;
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+ int bytes_remaining;
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+
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+ if(ses == NULL)
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+ return -EINVAL;
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+
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+ type = ses->server->secType;
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+ if(type == LANMAN) {
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+#ifndef CONFIG_CIFS_WEAK_PW_HASH
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+ /* LANMAN and plaintext are less secure and off by default.
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+ So we make this explicitly be turned on in kconfig (in the
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+ build) and turned on at runtime (changed from the default)
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+ in proc/fs/cifs or via mount parm. Unfortunately this is
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+ needed for old Win (e.g. Win95), some obscure NAS and OS/2 */
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+ return -EOPNOTSUPP;
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+#endif
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+ wct = 10; /* lanman 2 style sessionsetup */
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+ } else if(type == NTLM) /* NTLMv2 may retry NTLM */
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+ wct = 13; /* old style NTLM sessionsetup */
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+ else /* same size for negotiate or auth, NTLMSSP or extended security */
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+ wct = 12;
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+
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+ rc = small_smb_init_no_tc(SMB_COM_SESSION_SETUP_ANDX, wct, ses,
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+ (void **)&smb_buf);
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+ if(rc)
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+ return rc;
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+
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+ pSMB = (SESSION_SETUP_ANDX *)smb_buf;
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+
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+ capabilities = cifs_ssetup_hdr(ses, pSMB);
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+ bcc_ptr = pByteArea(smb_buf);
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+
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+ if(type == LANMAN) {
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+#ifdef CONFIG_CIFS_WEAK_PW_HASH
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+ char lnm_session_key[CIFS_SESSION_KEY_SIZE];
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+ char password_with_pad[CIFS_ENCPWD_SIZE];
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+
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+ /* no capabilities flags in old lanman negotiation */
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+
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+ pSMB->old_req.PasswordLength = CIFS_SESSION_KEY_SIZE;
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+ /* BB calculate hash with password */
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+ /* and copy into bcc */
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+
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+ memset(password_with_pad, 0, CIFS_ENCPWD_SIZE);
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+ strncpy(password_with_pad, ses->password, CIFS_ENCPWD_SIZE);
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+
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+ /* calculate old style session key */
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+ /* toupper may be less broken then repeatedly calling
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+ nls_toupper would be, but neither handles multibyte code pages
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+ but the only alternative would be converting to UCS-16 (Unicode)
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+ uppercasing and converting back which is only worth doing if
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+ we knew it were utf8. utf8 code page needs its own
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+ toupper and tolower and strnicmp functions */
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+
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+ for(i = 0; i< CIFS_ENCPWD_SIZE; i++) {
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+ password_with_pad[i] = toupper(password_with_pad[i]);
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+ }
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+
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+ SMBencrypt(password_with_pad, ses->server->cryptKey,
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+ lnm_session_key);
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+
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+#ifdef CONFIG_CIFS_DEBUG2
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+ cifs_dump_mem("cryptkey: ",ses->server->cryptKey,
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+ CIFS_SESSION_KEY_SIZE);
|
|
|
+#endif
|
|
|
+ /* clear password before we return/free memory */
|
|
|
+ memset(password_with_pad, 0, CIFS_ENCPWD_SIZE);
|
|
|
+ memcpy(bcc_ptr, (char *)lnm_session_key, CIFS_SESSION_KEY_SIZE);
|
|
|
+ bcc_ptr += CIFS_SESSION_KEY_SIZE;
|
|
|
+
|
|
|
+ /* can not sign if LANMAN negotiated so no need
|
|
|
+ to calculate signing key? but what if server
|
|
|
+ changed to do higher than lanman dialect and
|
|
|
+ we reconnected would we ever calc signing_key? */
|
|
|
+
|
|
|
+ cERROR(1,("Negotiating LANMAN setting up strings"));
|
|
|
+ /* Unicode not allowed for LANMAN dialects */
|
|
|
+ ascii_ssetup_strings(&bcc_ptr, ses, nls_cp);
|
|
|
+#endif
|
|
|
+ } else if (type == NTLM) {
|
|
|
+ char ntlm_session_key[CIFS_SESSION_KEY_SIZE];
|
|
|
+
|
|
|
+ pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
|
|
|
+ pSMB->req_no_secext.CaseInsensitivePasswordLength =
|
|
|
+ cpu_to_le16(CIFS_SESSION_KEY_SIZE);
|
|
|
+ pSMB->req_no_secext.CaseSensitivePasswordLength =
|
|
|
+ cpu_to_le16(CIFS_SESSION_KEY_SIZE);
|
|
|
+
|
|
|
+ /* calculate session key */
|
|
|
+ SMBNTencrypt(ses->password, ses->server->cryptKey,
|
|
|
+ ntlm_session_key);
|
|
|
+
|
|
|
+ if(first_time) /* should this be moved into common code
|
|
|
+ with similar ntlmv2 path? */
|
|
|
+ cifs_calculate_mac_key(
|
|
|
+ ses->server->mac_signing_key,
|
|
|
+ ntlm_session_key, ses->password);
|
|
|
+ /* copy session key */
|
|
|
+
|
|
|
+ memcpy(bcc_ptr, (char *)ntlm_session_key,CIFS_SESSION_KEY_SIZE);
|
|
|
+ bcc_ptr += CIFS_SESSION_KEY_SIZE;
|
|
|
+ memcpy(bcc_ptr, (char *)ntlm_session_key,CIFS_SESSION_KEY_SIZE);
|
|
|
+ bcc_ptr += CIFS_SESSION_KEY_SIZE;
|
|
|
+ if(ses->capabilities & CAP_UNICODE)
|
|
|
+ unicode_ssetup_strings(&bcc_ptr, ses, nls_cp);
|
|
|
+ else
|
|
|
+ ascii_ssetup_strings(&bcc_ptr, ses, nls_cp);
|
|
|
+ } else /* NTLMSSP or SPNEGO */ {
|
|
|
+ pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
|
|
|
+ capabilities |= CAP_EXTENDED_SECURITY;
|
|
|
+ pSMB->req.Capabilities = cpu_to_le32(capabilities);
|
|
|
+ /* BB set password lengths */
|
|
|
+ }
|
|
|
+
|
|
|
+ count = (long) bcc_ptr - (long) pByteArea(smb_buf);
|
|
|
+ smb_buf->smb_buf_length += count;
|
|
|
+
|
|
|
+ /* if we switch to small buffers, count will need to be fewer
|
|
|
+ than 383 (strings less than 335 bytes) */
|
|
|
+
|
|
|
+ BCC_LE(smb_buf) = cpu_to_le16(count);
|
|
|
+
|
|
|
+
|
|
|
+ /* BB FIXME check for other non ntlm code paths */
|
|
|
+
|
|
|
+ /* BB check is this too big for a small smb? */
|
|
|
+
|
|
|
+ iov[0].iov_base = (char *)pSMB;
|
|
|
+ iov[0].iov_len = smb_buf->smb_buf_length + 4;
|
|
|
+
|
|
|
+ rc = SendReceive2(xid, ses, iov, 1 /* num_iovecs */, &resp_buf_type, 0);
|
|
|
+ /* SMB request buf freed in SendReceive2 */
|
|
|
+
|
|
|
+ cFYI(1,("ssetup rc from sendrecv2 is %d",rc));
|
|
|
+ if(rc)
|
|
|
+ goto ssetup_exit;
|
|
|
+
|
|
|
+ pSMB = (SESSION_SETUP_ANDX *)iov[0].iov_base;
|
|
|
+ smb_buf = (struct smb_hdr *)iov[0].iov_base;
|
|
|
+
|
|
|
+ if((smb_buf->WordCount != 3) && (smb_buf->WordCount != 4)) {
|
|
|
+ rc = -EIO;
|
|
|
+ cERROR(1,("bad word count %d", smb_buf->WordCount));
|
|
|
+ goto ssetup_exit;
|
|
|
+ }
|
|
|
+ action = le16_to_cpu(pSMB->resp.Action);
|
|
|
+ if (action & GUEST_LOGIN)
|
|
|
+ cFYI(1, (" Guest login")); /* BB mark SesInfo struct? */
|
|
|
+ ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
|
|
|
+ cFYI(1, ("UID = %d ", ses->Suid));
|
|
|
+ /* response can have either 3 or 4 word count - Samba sends 3 */
|
|
|
+ /* and lanman response is 3 */
|
|
|
+ bytes_remaining = BCC(smb_buf);
|
|
|
+ bcc_ptr = pByteArea(smb_buf);
|
|
|
+
|
|
|
+ if(smb_buf->WordCount == 4) {
|
|
|
+ __u16 blob_len;
|
|
|
+ blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
|
|
|
+ bcc_ptr += blob_len;
|
|
|
+ if(blob_len > bytes_remaining) {
|
|
|
+ cERROR(1,("bad security blob length %d", blob_len));
|
|
|
+ rc = -EINVAL;
|
|
|
+ goto ssetup_exit;
|
|
|
+ }
|
|
|
+ bytes_remaining -= blob_len;
|
|
|
+ }
|
|
|
+
|
|
|
+ /* BB check if Unicode and decode strings */
|
|
|
+ if(smb_buf->Flags2 & SMBFLG2_UNICODE)
|
|
|
+ rc = decode_unicode_ssetup(&bcc_ptr, bytes_remaining,
|
|
|
+ ses, nls_cp);
|
|
|
+ else
|
|
|
+ rc = decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,nls_cp);
|
|
|
+
|
|
|
+ssetup_exit:
|
|
|
+ if(resp_buf_type == CIFS_SMALL_BUFFER) {
|
|
|
+ cFYI(1,("ssetup freeing small buf %p", iov[0].iov_base));
|
|
|
+ cifs_small_buf_release(iov[0].iov_base);
|
|
|
+ } else if(resp_buf_type == CIFS_LARGE_BUFFER)
|
|
|
+ cifs_buf_release(iov[0].iov_base);
|
|
|
+
|
|
|
+ return rc;
|
|
|
+}
|
|
|
+#endif /* CONFIG_CIFS_EXPERIMENTAL */
|
Steve French