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Convert default dialect to smb2.1 or later to allow connecting to Windows 7 for example, also includes some fixes for stable
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This commit is contained in:
Linus Torvalds
commit
24420862bf
@ -41,6 +41,11 @@ Igor Mammedov (DFS support)
|
||||
Jeff Layton (many, many fixes, as well as great work on the cifs Kerberos code)
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Scott Lovenberg
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Pavel Shilovsky (for great work adding SMB2 support, and various SMB3 features)
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Aurelien Aptel (for DFS SMB3 work and some key bug fixes)
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Ronnie Sahlberg (for SMB3 xattr work and bug fixes)
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Shirish Pargaonkar (for many ACL patches over the years)
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Sachin Prabhu (many bug fixes, including for reconnect, copy offload and security)
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Test case and Bug Report contributors
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-------------------------------------
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@ -1,10 +1,14 @@
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The CIFS VFS support for Linux supports many advanced network filesystem
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features such as hierarchical dfs like namespace, hardlinks, locking and more.
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This module supports the SMB3 family of advanced network protocols (as well
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as older dialects, originally called "CIFS" or SMB1).
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The CIFS VFS module for Linux supports many advanced network filesystem
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features such as hierarchical DFS like namespace, hardlinks, locking and more.
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It was designed to comply with the SNIA CIFS Technical Reference (which
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supersedes the 1992 X/Open SMB Standard) as well as to perform best practice
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practical interoperability with Windows 2000, Windows XP, Samba and equivalent
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servers. This code was developed in participation with the Protocol Freedom
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Information Foundation.
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Information Foundation. CIFS and now SMB3 has now become a defacto
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standard for interoperating between Macs and Windows and major NAS appliances.
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Please see
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http://protocolfreedom.org/ and
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@ -15,30 +19,11 @@ for more details.
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For questions or bug reports please contact:
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sfrench@samba.org (sfrench@us.ibm.com)
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See the project page at: https://wiki.samba.org/index.php/LinuxCIFS_utils
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Build instructions:
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==================
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For Linux 2.4:
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1) Get the kernel source (e.g.from http://www.kernel.org)
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and download the cifs vfs source (see the project page
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at http://us1.samba.org/samba/Linux_CIFS_client.html)
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and change directory into the top of the kernel directory
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then patch the kernel (e.g. "patch -p1 < cifs_24.patch")
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to add the cifs vfs to your kernel configure options if
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it has not already been added (e.g. current SuSE and UL
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users do not need to apply the cifs_24.patch since the cifs vfs is
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already in the kernel configure menu) and then
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mkdir linux/fs/cifs and then copy the current cifs vfs files from
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the cifs download to your kernel build directory e.g.
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cp <cifs_download_dir>/fs/cifs/* to <kernel_download_dir>/fs/cifs
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2) make menuconfig (or make xconfig)
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3) select cifs from within the network filesystem choices
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4) save and exit
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5) make dep
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6) make modules (or "make" if CIFS VFS not to be built as a module)
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For Linux 2.6:
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For Linux:
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1) Download the kernel (e.g. from http://www.kernel.org)
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and change directory into the top of the kernel directory tree
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(e.g. /usr/src/linux-2.5.73)
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@ -61,16 +46,13 @@ would simply type "make install").
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If you do not have the utility mount.cifs (in the Samba 3.0 source tree and on
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the CIFS VFS web site) copy it to the same directory in which mount.smbfs and
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similar files reside (usually /sbin). Although the helper software is not
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required, mount.cifs is recommended. Eventually the Samba 3.0 utility program
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"net" may also be helpful since it may someday provide easier mount syntax for
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users who are used to Windows e.g.
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net use <mount point> <UNC name or cifs URL>
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required, mount.cifs is recommended. Most distros include a "cifs-utils"
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package that includes this utility so it is recommended to install this.
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Note that running the Winbind pam/nss module (logon service) on all of your
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Linux clients is useful in mapping Uids and Gids consistently across the
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domain to the proper network user. The mount.cifs mount helper can be
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trivially built from Samba 3.0 or later source e.g. by executing:
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gcc samba/source/client/mount.cifs.c -o mount.cifs
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found at cifs-utils.git on git.samba.org
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If cifs is built as a module, then the size and number of network buffers
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and maximum number of simultaneous requests to one server can be configured.
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@ -79,6 +61,18 @@ Changing these from their defaults is not recommended. By executing modinfo
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on kernel/fs/cifs/cifs.ko the list of configuration changes that can be made
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at module initialization time (by running insmod cifs.ko) can be seen.
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Recommendations
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===============
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To improve security the SMB2.1 dialect or later (usually will get SMB3) is now
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the new default. To use old dialects (e.g. to mount Windows XP) use "vers=1.0"
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on mount (or vers=2.0 for Windows Vista). Note that the CIFS (vers=1.0) is
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much older and less secure than the default dialect SMB3 which includes
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many advanced security features such as downgrade attack detection
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and encrypted shares and stronger signing and authentication algorithms.
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There are additional mount options that may be helpful for SMB3 to get
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improved POSIX behavior (NB: can use vers=3.0 to force only SMB3, never 2.1):
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"mfsymlinks" and "cifsacl" and "idsfromsid"
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Allowing User Mounts
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====================
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To permit users to mount and unmount over directories they own is possible
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@ -98,9 +92,7 @@ and execution of suid programs on the remote target would be enabled
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by default. This can be changed, as with nfs and other filesystems,
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by simply specifying "nosuid" among the mount options. For user mounts
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though to be able to pass the suid flag to mount requires rebuilding
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mount.cifs with the following flag:
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gcc samba/source/client/mount.cifs.c -DCIFS_ALLOW_USR_SUID -o mount.cifs
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mount.cifs with the following flag: CIFS_ALLOW_USR_SUID
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There is a corresponding manual page for cifs mounting in the Samba 3.0 and
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later source tree in docs/manpages/mount.cifs.8
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@ -189,18 +181,18 @@ applications running on the same server as Samba.
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Use instructions:
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================
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Once the CIFS VFS support is built into the kernel or installed as a module
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(cifs.o), you can use mount syntax like the following to access Samba or Windows
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servers:
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(cifs.ko), you can use mount syntax like the following to access Samba or
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Mac or Windows servers:
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mount -t cifs //9.53.216.11/e$ /mnt -o user=myname,pass=mypassword
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mount -t cifs //9.53.216.11/e$ /mnt -o username=myname,password=mypassword
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Before -o the option -v may be specified to make the mount.cifs
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mount helper display the mount steps more verbosely.
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After -o the following commonly used cifs vfs specific options
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are supported:
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user=<username>
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pass=<password>
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username=<username>
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password=<password>
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domain=<domain name>
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Other cifs mount options are described below. Use of TCP names (in addition to
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@ -246,13 +238,16 @@ the Server's registry. Samba starting with version 3.10 will allow such
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filenames (ie those which contain valid Linux characters, which normally
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would be forbidden for Windows/CIFS semantics) as long as the server is
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configured for Unix Extensions (and the client has not disabled
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/proc/fs/cifs/LinuxExtensionsEnabled).
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|
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/proc/fs/cifs/LinuxExtensionsEnabled). In addition the mount option
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"mapposix" can be used on CIFS (vers=1.0) to force the mapping of
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illegal Windows/NTFS/SMB characters to a remap range (this mount parm
|
||||
is the default for SMB3). This remap ("mapposix") range is also
|
||||
compatible with Mac (and "Services for Mac" on some older Windows).
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|
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CIFS VFS Mount Options
|
||||
======================
|
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A partial list of the supported mount options follows:
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user The user name to use when trying to establish
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username The user name to use when trying to establish
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the CIFS session.
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password The user password. If the mount helper is
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||||
installed, the user will be prompted for password
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||||
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||||
@ -1,4 +1,4 @@
|
||||
Version 2.03 August 1, 2014
|
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Version 2.04 September 13, 2017
|
||||
|
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A Partial List of Missing Features
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==================================
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@ -8,73 +8,69 @@ for visible, important contributions to this module. Here
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||||
is a partial list of the known problems and missing features:
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||||
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a) SMB3 (and SMB3.02) missing optional features:
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- RDMA
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- RDMA (started)
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- multichannel (started)
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- directory leases (improved metadata caching)
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- T10 copy offload (copy chunk is only mechanism supported)
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- encrypted shares
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b) improved sparse file support
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c) Directory entry caching relies on a 1 second timer, rather than
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using FindNotify or equivalent. - (started)
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using Directory Leases
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d) quota support (needs minor kernel change since quota calls
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to make it to network filesystems or deviceless filesystems)
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e) improve support for very old servers (OS/2 and Win9x for example)
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Including support for changing the time remotely (utimes command).
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e) Better optimize open to reduce redundant opens (using reference
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counts more) and to improve use of compounding in SMB3 to reduce
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number of roundtrips.
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f) hook lower into the sockets api (as NFS/SunRPC does) to avoid the
|
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extra copy in/out of the socket buffers in some cases.
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g) Better optimize open (and pathbased setfilesize) to reduce the
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oplock breaks coming from windows srv. Piggyback identical file
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opens on top of each other by incrementing reference count rather
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than resending (helps reduce server resource utilization and avoid
|
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spurious oplock breaks).
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h) Add support for storing symlink info to Windows servers
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in the Extended Attribute format their SFU clients would recognize.
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|
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i) Finish inotify support so kde and gnome file list windows
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f) Finish inotify support so kde and gnome file list windows
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will autorefresh (partially complete by Asser). Needs minor kernel
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vfs change to support removing D_NOTIFY on a file.
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j) Add GUI tool to configure /proc/fs/cifs settings and for display of
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g) Add GUI tool to configure /proc/fs/cifs settings and for display of
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the CIFS statistics (started)
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k) implement support for security and trusted categories of xattrs
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h) implement support for security and trusted categories of xattrs
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(requires minor protocol extension) to enable better support for SELINUX
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|
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l) Implement O_DIRECT flag on open (already supported on mount)
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i) Implement O_DIRECT flag on open (already supported on mount)
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|
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m) Create UID mapping facility so server UIDs can be mapped on a per
|
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j) Create UID mapping facility so server UIDs can be mapped on a per
|
||||
mount or a per server basis to client UIDs or nobody if no mapping
|
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exists. This is helpful when Unix extensions are negotiated to
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allow better permission checking when UIDs differ on the server
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and client. Add new protocol request to the CIFS protocol
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standard for asking the server for the corresponding name of a
|
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particular uid.
|
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exists. Also better integration with winbind for resolving SID owners
|
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|
||||
n) DOS attrs - returned as pseudo-xattr in Samba format (check VFAT and NTFS for this too)
|
||||
k) Add tools to take advantage of more smb3 specific ioctls and features
|
||||
|
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o) mount check for unmatched uids
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l) encrypted file support
|
||||
|
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p) Add support for new vfs entry point for fallocate
|
||||
m) improved stats gathering, tools (perhaps integration with nfsometer?)
|
||||
|
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q) Add tools to take advantage of cifs/smb3 specific ioctls and features
|
||||
such as "CopyChunk" (fast server side file copy)
|
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n) allow setting more NTFS/SMB3 file attributes remotely (currently limited to compressed
|
||||
file attribute via chflags) and improve user space tools for managing and
|
||||
viewing them.
|
||||
|
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r) encrypted file support
|
||||
o) mount helper GUI (to simplify the various configuration options on mount)
|
||||
|
||||
s) improved stats gathering, tools (perhaps integration with nfsometer?)
|
||||
p) autonegotiation of dialects (offering more than one dialect ie SMB3.02,
|
||||
SMB3, SMB2.1 not just SMB3).
|
||||
|
||||
t) allow setting more NTFS/SMB3 file attributes remotely (currently limited to compressed
|
||||
file attribute via chflags)
|
||||
q) Allow mount.cifs to be more verbose in reporting errors with dialect
|
||||
or unsupported feature errors.
|
||||
|
||||
u) mount helper GUI (to simplify the various configuration options on mount)
|
||||
r) updating cifs documentation, and user guid.
|
||||
|
||||
s) Addressing bugs found by running a broader set of xfstests in standard
|
||||
file system xfstest suite.
|
||||
|
||||
t) split cifs and smb3 support into separate modules so legacy (and less
|
||||
secure) CIFS dialect can be disabled in environments that don't need it
|
||||
and simplify the code.
|
||||
|
||||
u) Finish up SMB3.1.1 dialect support
|
||||
|
||||
v) POSIX Extensions for SMB3.1.1
|
||||
|
||||
KNOWN BUGS
|
||||
====================================
|
||||
|
||||
@ -1,24 +1,28 @@
|
||||
This is the client VFS module for the Common Internet File System
|
||||
(CIFS) protocol which is the successor to the Server Message Block
|
||||
This is the client VFS module for the SMB3 NAS protocol as well
|
||||
older dialects such as the Common Internet File System (CIFS)
|
||||
protocol which was the successor to the Server Message Block
|
||||
(SMB) protocol, the native file sharing mechanism for most early
|
||||
PC operating systems. New and improved versions of CIFS are now
|
||||
called SMB2 and SMB3. These dialects are also supported by the
|
||||
CIFS VFS module. CIFS is fully supported by network
|
||||
file servers such as Windows 2000, 2003, 2008 and 2012
|
||||
file servers such as Windows 2000, 2003, 2008, 2012 and 2016
|
||||
as well by Samba (which provides excellent CIFS
|
||||
server support for Linux and many other operating systems), so
|
||||
server support for Linux and many other operating systems), Apple
|
||||
systems, as well as most Network Attached Storage vendors, so
|
||||
this network filesystem client can mount to a wide variety of
|
||||
servers.
|
||||
|
||||
The intent of this module is to provide the most advanced network
|
||||
file system function for CIFS compliant servers, including better
|
||||
POSIX compliance, secure per-user session establishment, high
|
||||
performance safe distributed caching (oplock), optional packet
|
||||
file system function for SMB3 compliant servers, including advanced
|
||||
security features, excellent parallelized high performance i/o, better
|
||||
POSIX compliance, secure per-user session establishment, encryption,
|
||||
high performance safe distributed caching (leases/oplocks), optional packet
|
||||
signing, large files, Unicode support and other internationalization
|
||||
improvements. Since both Samba server and this filesystem client support
|
||||
the CIFS Unix extensions, the combination can provide a reasonable
|
||||
alternative to NFSv4 for fileserving in some Linux to Linux environments,
|
||||
not just in Linux to Windows environments.
|
||||
the CIFS Unix extensions (and in the future SMB3 POSIX extensions),
|
||||
the combination can provide a reasonable alternative to other network and
|
||||
cluster file systems for fileserving in some Linux to Linux environments,
|
||||
not just in Linux to Windows (or Linux to Mac) environments.
|
||||
|
||||
This filesystem has an mount utility (mount.cifs) that can be obtained from
|
||||
|
||||
|
||||
@ -149,5 +149,5 @@ extern long cifs_ioctl(struct file *filep, unsigned int cmd, unsigned long arg);
|
||||
extern const struct export_operations cifs_export_ops;
|
||||
#endif /* CONFIG_CIFS_NFSD_EXPORT */
|
||||
|
||||
#define CIFS_VERSION "2.09"
|
||||
#define CIFS_VERSION "2.10"
|
||||
#endif /* _CIFSFS_H */
|
||||
|
||||
@ -188,6 +188,8 @@ enum smb_version {
|
||||
#ifdef CONFIG_CIFS_SMB311
|
||||
Smb_311,
|
||||
#endif /* SMB311 */
|
||||
Smb_3any,
|
||||
Smb_default,
|
||||
Smb_version_err
|
||||
};
|
||||
|
||||
@ -1701,6 +1703,10 @@ extern struct smb_version_values smb20_values;
|
||||
#define SMB21_VERSION_STRING "2.1"
|
||||
extern struct smb_version_operations smb21_operations;
|
||||
extern struct smb_version_values smb21_values;
|
||||
#define SMBDEFAULT_VERSION_STRING "default"
|
||||
extern struct smb_version_values smbdefault_values;
|
||||
#define SMB3ANY_VERSION_STRING "3"
|
||||
extern struct smb_version_values smb3any_values;
|
||||
#define SMB30_VERSION_STRING "3.0"
|
||||
extern struct smb_version_operations smb30_operations;
|
||||
extern struct smb_version_values smb30_values;
|
||||
|
||||
@ -301,6 +301,8 @@ static const match_table_t cifs_smb_version_tokens = {
|
||||
{ Smb_311, SMB311_VERSION_STRING },
|
||||
{ Smb_311, ALT_SMB311_VERSION_STRING },
|
||||
#endif /* SMB311 */
|
||||
{ Smb_3any, SMB3ANY_VERSION_STRING },
|
||||
{ Smb_default, SMBDEFAULT_VERSION_STRING },
|
||||
{ Smb_version_err, NULL }
|
||||
};
|
||||
|
||||
@ -1148,6 +1150,14 @@ cifs_parse_smb_version(char *value, struct smb_vol *vol)
|
||||
vol->vals = &smb311_values;
|
||||
break;
|
||||
#endif /* SMB311 */
|
||||
case Smb_3any:
|
||||
vol->ops = &smb30_operations; /* currently identical with 3.0 */
|
||||
vol->vals = &smb3any_values;
|
||||
break;
|
||||
case Smb_default:
|
||||
vol->ops = &smb30_operations; /* currently identical with 3.0 */
|
||||
vol->vals = &smbdefault_values;
|
||||
break;
|
||||
default:
|
||||
cifs_dbg(VFS, "Unknown vers= option specified: %s\n", value);
|
||||
return 1;
|
||||
@ -1274,9 +1284,9 @@ cifs_parse_mount_options(const char *mountdata, const char *devname,
|
||||
|
||||
vol->actimeo = CIFS_DEF_ACTIMEO;
|
||||
|
||||
/* FIXME: add autonegotiation for SMB3 or later rather than just SMB3 */
|
||||
vol->ops = &smb30_operations; /* both secure and accepted widely */
|
||||
vol->vals = &smb30_values;
|
||||
/* offer SMB2.1 and later (SMB3 etc). Secure and widely accepted */
|
||||
vol->ops = &smb30_operations;
|
||||
vol->vals = &smbdefault_values;
|
||||
|
||||
vol->echo_interval = SMB_ECHO_INTERVAL_DEFAULT;
|
||||
|
||||
@ -1988,11 +1998,10 @@ cifs_parse_mount_options(const char *mountdata, const char *devname,
|
||||
|
||||
if (got_version == false)
|
||||
pr_warn("No dialect specified on mount. Default has changed to "
|
||||
"a more secure dialect, SMB3 (vers=3.0), from CIFS "
|
||||
"a more secure dialect, SMB2.1 or later (e.g. SMB3), from CIFS "
|
||||
"(SMB1). To use the less secure SMB1 dialect to access "
|
||||
"old servers which do not support SMB3 specify vers=1.0"
|
||||
" on mount. For somewhat newer servers such as Windows "
|
||||
"7 try vers=2.1.\n");
|
||||
"old servers which do not support SMB3 (or SMB2.1) specify vers=1.0"
|
||||
" on mount.\n");
|
||||
|
||||
kfree(mountdata_copy);
|
||||
return 0;
|
||||
@ -2133,6 +2142,7 @@ static int match_server(struct TCP_Server_Info *server, struct smb_vol *vol)
|
||||
if (vol->nosharesock)
|
||||
return 0;
|
||||
|
||||
/* BB update this for smb3any and default case */
|
||||
if ((server->vals != vol->vals) || (server->ops != vol->ops))
|
||||
return 0;
|
||||
|
||||
|
||||
@ -426,6 +426,7 @@ smb2_query_file_info(const unsigned int xid, struct cifs_tcon *tcon,
|
||||
return rc;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_CIFS_XATTR
|
||||
static ssize_t
|
||||
move_smb2_ea_to_cifs(char *dst, size_t dst_size,
|
||||
struct smb2_file_full_ea_info *src, size_t src_size,
|
||||
@ -613,6 +614,7 @@ smb2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
|
||||
|
||||
return rc;
|
||||
}
|
||||
#endif
|
||||
|
||||
static bool
|
||||
smb2_can_echo(struct TCP_Server_Info *server)
|
||||
@ -3110,6 +3112,46 @@ struct smb_version_values smb21_values = {
|
||||
.create_lease_size = sizeof(struct create_lease),
|
||||
};
|
||||
|
||||
struct smb_version_values smb3any_values = {
|
||||
.version_string = SMB3ANY_VERSION_STRING,
|
||||
.protocol_id = SMB302_PROT_ID, /* doesn't matter, send protocol array */
|
||||
.req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU | SMB2_GLOBAL_CAP_PERSISTENT_HANDLES | SMB2_GLOBAL_CAP_ENCRYPTION,
|
||||
.large_lock_type = 0,
|
||||
.exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
|
||||
.shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
|
||||
.unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
|
||||
.header_size = sizeof(struct smb2_hdr),
|
||||
.max_header_size = MAX_SMB2_HDR_SIZE,
|
||||
.read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
|
||||
.lock_cmd = SMB2_LOCK,
|
||||
.cap_unix = 0,
|
||||
.cap_nt_find = SMB2_NT_FIND,
|
||||
.cap_large_files = SMB2_LARGE_FILES,
|
||||
.signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
|
||||
.signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
|
||||
.create_lease_size = sizeof(struct create_lease_v2),
|
||||
};
|
||||
|
||||
struct smb_version_values smbdefault_values = {
|
||||
.version_string = SMBDEFAULT_VERSION_STRING,
|
||||
.protocol_id = SMB302_PROT_ID, /* doesn't matter, send protocol array */
|
||||
.req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU | SMB2_GLOBAL_CAP_PERSISTENT_HANDLES | SMB2_GLOBAL_CAP_ENCRYPTION,
|
||||
.large_lock_type = 0,
|
||||
.exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
|
||||
.shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
|
||||
.unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
|
||||
.header_size = sizeof(struct smb2_hdr),
|
||||
.max_header_size = MAX_SMB2_HDR_SIZE,
|
||||
.read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
|
||||
.lock_cmd = SMB2_LOCK,
|
||||
.cap_unix = 0,
|
||||
.cap_nt_find = SMB2_NT_FIND,
|
||||
.cap_large_files = SMB2_LARGE_FILES,
|
||||
.signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
|
||||
.signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
|
||||
.create_lease_size = sizeof(struct create_lease_v2),
|
||||
};
|
||||
|
||||
struct smb_version_values smb30_values = {
|
||||
.version_string = SMB30_VERSION_STRING,
|
||||
.protocol_id = SMB30_PROT_ID,
|
||||
|
||||
@ -491,10 +491,25 @@ SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
|
||||
|
||||
req->hdr.sync_hdr.SessionId = 0;
|
||||
|
||||
req->Dialects[0] = cpu_to_le16(ses->server->vals->protocol_id);
|
||||
|
||||
req->DialectCount = cpu_to_le16(1); /* One vers= at a time for now */
|
||||
inc_rfc1001_len(req, 2);
|
||||
if (strcmp(ses->server->vals->version_string,
|
||||
SMB3ANY_VERSION_STRING) == 0) {
|
||||
req->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
|
||||
req->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
|
||||
req->DialectCount = cpu_to_le16(2);
|
||||
inc_rfc1001_len(req, 4);
|
||||
} else if (strcmp(ses->server->vals->version_string,
|
||||
SMBDEFAULT_VERSION_STRING) == 0) {
|
||||
req->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
|
||||
req->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
|
||||
req->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
|
||||
req->DialectCount = cpu_to_le16(3);
|
||||
inc_rfc1001_len(req, 6);
|
||||
} else {
|
||||
/* otherwise send specific dialect */
|
||||
req->Dialects[0] = cpu_to_le16(ses->server->vals->protocol_id);
|
||||
req->DialectCount = cpu_to_le16(1);
|
||||
inc_rfc1001_len(req, 2);
|
||||
}
|
||||
|
||||
/* only one of SMB2 signing flags may be set in SMB2 request */
|
||||
if (ses->sign)
|
||||
@ -528,16 +543,42 @@ SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
|
||||
*/
|
||||
if (rc == -EOPNOTSUPP) {
|
||||
cifs_dbg(VFS, "Dialect not supported by server. Consider "
|
||||
"specifying vers=1.0 or vers=2.1 on mount for accessing"
|
||||
"specifying vers=1.0 or vers=2.0 on mount for accessing"
|
||||
" older servers\n");
|
||||
goto neg_exit;
|
||||
} else if (rc != 0)
|
||||
goto neg_exit;
|
||||
|
||||
if (strcmp(ses->server->vals->version_string,
|
||||
SMB3ANY_VERSION_STRING) == 0) {
|
||||
if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
|
||||
cifs_dbg(VFS,
|
||||
"SMB2 dialect returned but not requested\n");
|
||||
return -EIO;
|
||||
} else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
|
||||
cifs_dbg(VFS,
|
||||
"SMB2.1 dialect returned but not requested\n");
|
||||
return -EIO;
|
||||
}
|
||||
} else if (strcmp(ses->server->vals->version_string,
|
||||
SMBDEFAULT_VERSION_STRING) == 0) {
|
||||
if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
|
||||
cifs_dbg(VFS,
|
||||
"SMB2 dialect returned but not requested\n");
|
||||
return -EIO;
|
||||
} else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
|
||||
/* ops set to 3.0 by default for default so update */
|
||||
ses->server->ops = &smb21_operations;
|
||||
}
|
||||
} else if (rsp->DialectRevision != ses->server->vals->protocol_id) {
|
||||
/* if requested single dialect ensure returned dialect matched */
|
||||
cifs_dbg(VFS, "Illegal 0x%x dialect returned: not requested\n",
|
||||
cpu_to_le16(rsp->DialectRevision));
|
||||
return -EIO;
|
||||
}
|
||||
|
||||
cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
|
||||
|
||||
/* BB we may eventually want to match the negotiated vs. requested
|
||||
dialect, even though we are only requesting one at a time */
|
||||
if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
|
||||
cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
|
||||
else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
|
||||
@ -558,6 +599,8 @@ SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
|
||||
}
|
||||
server->dialect = le16_to_cpu(rsp->DialectRevision);
|
||||
|
||||
/* BB: add check that dialect was valid given dialect(s) we asked for */
|
||||
|
||||
/* SMB2 only has an extended negflavor */
|
||||
server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
|
||||
/* set it to the maximum buffer size value we can send with 1 credit */
|
||||
@ -606,6 +649,7 @@ int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
|
||||
struct validate_negotiate_info_req vneg_inbuf;
|
||||
struct validate_negotiate_info_rsp *pneg_rsp;
|
||||
u32 rsplen;
|
||||
u32 inbuflen; /* max of 4 dialects */
|
||||
|
||||
cifs_dbg(FYI, "validate negotiate\n");
|
||||
|
||||
@ -634,9 +678,30 @@ int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
|
||||
else
|
||||
vneg_inbuf.SecurityMode = 0;
|
||||
|
||||
vneg_inbuf.DialectCount = cpu_to_le16(1);
|
||||
vneg_inbuf.Dialects[0] =
|
||||
cpu_to_le16(tcon->ses->server->vals->protocol_id);
|
||||
|
||||
if (strcmp(tcon->ses->server->vals->version_string,
|
||||
SMB3ANY_VERSION_STRING) == 0) {
|
||||
vneg_inbuf.Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
|
||||
vneg_inbuf.Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
|
||||
vneg_inbuf.DialectCount = cpu_to_le16(2);
|
||||
/* structure is big enough for 3 dialects, sending only 2 */
|
||||
inbuflen = sizeof(struct validate_negotiate_info_req) - 2;
|
||||
} else if (strcmp(tcon->ses->server->vals->version_string,
|
||||
SMBDEFAULT_VERSION_STRING) == 0) {
|
||||
vneg_inbuf.Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
|
||||
vneg_inbuf.Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
|
||||
vneg_inbuf.Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
|
||||
vneg_inbuf.DialectCount = cpu_to_le16(3);
|
||||
/* structure is big enough for 3 dialects */
|
||||
inbuflen = sizeof(struct validate_negotiate_info_req);
|
||||
} else {
|
||||
/* otherwise specific dialect was requested */
|
||||
vneg_inbuf.Dialects[0] =
|
||||
cpu_to_le16(tcon->ses->server->vals->protocol_id);
|
||||
vneg_inbuf.DialectCount = cpu_to_le16(1);
|
||||
/* structure is big enough for 3 dialects, sending only 1 */
|
||||
inbuflen = sizeof(struct validate_negotiate_info_req) - 4;
|
||||
}
|
||||
|
||||
rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
|
||||
FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
|
||||
@ -1634,7 +1699,7 @@ SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
|
||||
struct cifs_tcon *tcon = oparms->tcon;
|
||||
struct cifs_ses *ses = tcon->ses;
|
||||
struct kvec iov[4];
|
||||
struct kvec rsp_iov;
|
||||
struct kvec rsp_iov = {NULL, 0};
|
||||
int resp_buftype;
|
||||
int uni_path_len;
|
||||
__le16 *copy_path = NULL;
|
||||
@ -1763,7 +1828,7 @@ SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
|
||||
|
||||
if (rc != 0) {
|
||||
cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
|
||||
if (err_buf)
|
||||
if (err_buf && rsp)
|
||||
*err_buf = kmemdup(rsp, get_rfc1002_length(rsp) + 4,
|
||||
GFP_KERNEL);
|
||||
goto creat_exit;
|
||||
|
||||
@ -716,7 +716,7 @@ struct validate_negotiate_info_req {
|
||||
__u8 Guid[SMB2_CLIENT_GUID_SIZE];
|
||||
__le16 SecurityMode;
|
||||
__le16 DialectCount;
|
||||
__le16 Dialects[1]; /* dialect (someday maybe list) client asked for */
|
||||
__le16 Dialects[3]; /* BB expand this if autonegotiate > 3 dialects */
|
||||
} __packed;
|
||||
|
||||
struct validate_negotiate_info_rsp {
|
||||
|
||||
Loading…
Reference in New Issue
Block a user