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authorJeff Layton <jlayton@redhat.com>2010-07-06 20:43:02 -0400
committerSteve French <sfrench@us.ibm.com>2010-08-02 12:40:35 +0000
commit4ff67b720c02c36e54d55b88c2931879b7db1cd2 (patch)
tree2a69a278edb4d80a9fb0760d188629fb6e8371fb /fs
parentdaf5b0b6f3f6d7b15c2600426cc6c60a0e155218 (diff)
downloadkernel-4ff67b720c02c36e54d55b88c2931879b7db1cd2.tar.gz
cifs: clean up cifs_find_smb_ses (try #2)
This patch replaces the earlier patch by the same name. The only difference is that MAX_PASSWORD_SIZE has been increased to attempt to match the limits that windows enforces. Do a better job of matching sessions by authtype. Matching by username for a Kerberos session is incorrect, and anonymous sessions need special handling. Also, in the case where we do match by username, we also need to match by password. That ensures that someone else doesn't "borrow" an existing session without needing to know the password. Finally, passwords can be longer than 16 bytes. Bump MAX_PASSWORD_SIZE to 512 to match the size that the userspace mount helper allows. Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/cifs/cifsglob.h2
-rw-r--r--fs/cifs/connect.c26
2 files changed, 19 insertions, 9 deletions
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index 8fb1d10b8742..7b91cb4f0da4 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -37,7 +37,7 @@
#define MAX_SHARE_SIZE 64 /* used to be 20, this should still be enough */
#define MAX_USERNAME_SIZE 32 /* 32 is to allow for 15 char names + null
termination then *2 for unicode versions */
-#define MAX_PASSWORD_SIZE 16
+#define MAX_PASSWORD_SIZE 512 /* max for windows seems to be 256 wide chars */
#define CIFS_MIN_RCV_POOL 4
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index b24e4cea4e3c..b2063ce113ec 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -1644,17 +1644,27 @@ out_err:
}
static struct cifsSesInfo *
-cifs_find_smb_ses(struct TCP_Server_Info *server, char *username)
+cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb_vol *vol)
{
- struct list_head *tmp;
struct cifsSesInfo *ses;
write_lock(&cifs_tcp_ses_lock);
- list_for_each(tmp, &server->smb_ses_list) {
- ses = list_entry(tmp, struct cifsSesInfo, smb_ses_list);
- if (strncmp(ses->userName, username, MAX_USERNAME_SIZE))
- continue;
-
+ list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
+ switch (server->secType) {
+ case Kerberos:
+ if (vol->linux_uid != ses->linux_uid)
+ continue;
+ break;
+ default:
+ /* anything else takes username/password */
+ if (strncmp(ses->userName, vol->username,
+ MAX_USERNAME_SIZE))
+ continue;
+ if (strlen(vol->username) != 0 &&
+ strncmp(ses->password, vol->password,
+ MAX_PASSWORD_SIZE))
+ continue;
+ }
++ses->ses_count;
write_unlock(&cifs_tcp_ses_lock);
return ses;
@@ -1696,7 +1706,7 @@ cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb_vol *volume_info)
xid = GetXid();
- ses = cifs_find_smb_ses(server, volume_info->username);
+ ses = cifs_find_smb_ses(server, volume_info);
if (ses) {
cFYI(1, "Existing smb sess found (status=%d)", ses->status);