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[CIFS] Make sec=none force an anonymous mount

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We had a customer report that attempting to make CIFS mount with a null
username (i.e. doing an anonymous mount) doesn't work. Looking through the
code, it looks like CIFS expects a NULL username from userspace in order
to trigger an anonymous mount. The mount.cifs code doesn't seem to ever
pass a null username to the kernel, however.

It looks also like the kernel can take a sec=none option, but it only seems
to look at it if the username is already NULL. This seems redundant and
effectively makes sec=none useless.

The following patch makes sec=none force an anonymous mount.

Signed-off-by: Steve French <sfrench@us.ibm.com>
This commit is contained in:
Jeff Layton 2007-05-05 03:27:49 +00:00 committed by Steve French
parent 796e5661f6
commit 8426c39c12
3 changed files with 24 additions and 8 deletions
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4
fs/cifs/CHANGES
View file

@ -6,7 +6,9 @@ handle DNS host to ipv6 name translation). Accept override of uid or gid
on mount even when Unix Extensions are negotiated (it used to be ignored
when Unix Extensions were ignored). This allows users to override the
default uid and gid for files when they are certain that the uids or
gids on the server do not match those of the client.
gids on the server do not match those of the client. Make "sec=none"
mount override username (so that null user connection is attempted)
to match what documentation said.
Version 1.48
------------

20
fs/cifs/README
View file

@ -472,7 +472,7 @@ including:
-V print mount.cifs version
-? display simple usage information
With recent 2.6 kernel versions of modutils, the version of the cifs kernel
With most 2.6 kernel versions of modutils, the version of the cifs kernel
module can be displayed via modinfo.
Misc /proc/fs/cifs Flags and Debug Info
@ -521,8 +521,22 @@ SecurityFlags Flags which control security negotiation and
must use plaintext passwords 0x20020
(reserved for future packet encryption) 0x00040
cifsFYI If set to one, additional debug information is
logged to the system error log. (default 0)
cifsFYI If set to non-zero value, additional debug information
will be logged to the system error log. This field
contains three flags controlling different classes of
debugging entries. The maximum value it can be set
to is 7 which enables all debugging points (default 0).
Some debugging statements are not compiled into the
cifs kernel unless CONFIG_CIFS_DEBUG2 is enabled in the
kernel configuration. cifsFYI may be set to one or
nore of the following flags (7 sets them all):
log cifs informational messages 0x01
log return codes from cifs entry points 0x02
log slow responses (ie which take longer than one second)
CONFIG_CIFS_STATS2 must be enabled in .config 0x03
traceSMB If set to one, debug information is logged to the
system error log with the start of smb requests
and responses (default 0)

8
fs/cifs/connect.c
View file

@ -1721,12 +1721,12 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
return -EINVAL;
}
if (volume_info.username) {
if (volume_info.nullauth) {
cFYI(1,("null user"));
volume_info.username = NULL;
} else if (volume_info.username) {
/* BB fixme parse for domain name here */
cFYI(1, ("Username: %s ", volume_info.username));
} else if (volume_info.nullauth) {
cFYI(1,("null user"));
} else {
cifserror("No username specified");
/* In userspace mount helper we can get user name from alternate