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cifs: store password in tcon 

cifs: store password in tcon

Each tcon has its own password for share-level security. Store it in
the tcon and wipe it clean and free it when freeing the tcon. When
doing the tree connect with share-level security, use the tcon password
instead of the session password.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
This commit is contained in:
Jeff Layton 2008-12-05 20:41:21 -05:00 committed by Steve French
parent 4e53a3fb98
commit 00e485b019
3 changed files with 23 additions and 7 deletions
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1
fs/cifs/cifsglob.h
View File

@ -242,6 +242,7 @@ struct cifsTconInfo {
struct cifsSesInfo *ses; /* pointer to session associated with */
char treeName[MAX_TREE_SIZE + 1]; /* UNC name of resource in ASCII */
char *nativeFileSystem;
char *password; /* for share-level security */
__u16 tid; /* The 2 byte tree id */
__u16 Flags; /* optional support bits */
enum statusEnum tidStatus;

25
fs/cifs/connect.c
View File

@ -2282,9 +2282,12 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
/* volume_info->password freed at unmount */
if (volume_info->password) {
pSesInfo->password = volume_info->password;
/* set to NULL to prevent freeing on exit */
volume_info->password = NULL;
pSesInfo->password = kstrdup(volume_info->password,
GFP_KERNEL);
if (!pSesInfo->password) {
rc = -ENOMEM;
goto mount_fail_check;
}
}
if (volume_info->username)
strncpy(pSesInfo->userName, volume_info->username,
@ -2324,7 +2327,16 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
rc = -ENOMEM;
goto mount_fail_check;
}
tcon->ses = pSesInfo;
if (volume_info->password) {
tcon->password = kstrdup(volume_info->password,
GFP_KERNEL);
if (!tcon->password) {
rc = -ENOMEM;
goto mount_fail_check;
}
}
/* check for null share name ie connect to dfs root */
if ((strchr(volume_info->UNC + 3, '\\') == NULL)
@ -3532,15 +3544,14 @@ CIFSTCon(unsigned int xid, struct cifsSesInfo *ses,
NTLMv2 password here) */
#ifdef CONFIG_CIFS_WEAK_PW_HASH
if ((extended_security & CIFSSEC_MAY_LANMAN) &&
(ses->server->secType == LANMAN))
calc_lanman_hash(ses->password, ses->server->cryptKey,
(ses->server->secType == LANMAN))
calc_lanman_hash(tcon->password, ses->server->cryptKey,
ses->server->secMode &
SECMODE_PW_ENCRYPT ? true : false,
bcc_ptr);
else
#endif /* CIFS_WEAK_PW_HASH */
SMBNTencrypt(ses->password,
ses->server->cryptKey,
SMBNTencrypt(tcon->password, ses->server->cryptKey,
bcc_ptr);
bcc_ptr += CIFS_SESS_KEY_SIZE;

4
fs/cifs/misc.c
View File

@ -132,6 +132,10 @@ tconInfoFree(struct cifsTconInfo *buf_to_free)
}
atomic_dec(&tconInfoAllocCount);
kfree(buf_to_free->nativeFileSystem);
if (buf_to_free->password) {
memset(buf_to_free->password, 0, strlen(buf_to_free->password));
kfree(buf_to_free->password);
}
kfree(buf_to_free);
}