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smack: fix access permissions for keyring 

Function smack_key_permission() only issues smack requests for the
following operations:
 - KEY_NEED_READ (issues MAY_READ)
 - KEY_NEED_WRITE (issues MAY_WRITE)
 - KEY_NEED_LINK (issues MAY_WRITE)
 - KEY_NEED_SETATTR (issues MAY_WRITE)
A blank smack request is issued in all other cases, resulting in
smack access being granted if there is any rule defined between
subject and object, or denied with -EACCES otherwise.

Request MAY_READ access for KEY_NEED_SEARCH and KEY_NEED_VIEW.
Fix the logic in the unlikely case when both MAY_READ and
MAY_WRITE are needed. Validate access permission field for valid
contents.

Signed-off-by: Zoran Markovic <zmarkovic@sierrawireless.com>
Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
Cc: Casey Schaufler <casey@schaufler-ca.com>
Cc: James Morris <jmorris@namei.org>
Cc: "Serge E. Hallyn" <serge@hallyn.com>
This commit is contained in:
Zoran Markovic 2018-10-17 16:25:44 -07:00 committed by Casey Schaufler
parent 26b76320a8
commit 5b841bfab6
1 changed files with 9 additions and 3 deletions
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12
security/smack/smack_lsm.c
View File

@ -4333,6 +4333,12 @@ static int smack_key_permission(key_ref_t key_ref,
int request = 0;
int rc;
/*
* Validate requested permissions
*/
if (perm & ~KEY_NEED_ALL)
return -EINVAL;
keyp = key_ref_to_ptr(key_ref);
if (keyp == NULL)
return -EINVAL;
@ -4356,10 +4362,10 @@ static int smack_key_permission(key_ref_t key_ref,
ad.a.u.key_struct.key = keyp->serial;
ad.a.u.key_struct.key_desc = keyp->description;
#endif
if (perm & KEY_NEED_READ)
request = MAY_READ;
if (perm & (KEY_NEED_READ | KEY_NEED_SEARCH | KEY_NEED_VIEW))
request |= MAY_READ;
if (perm & (KEY_NEED_WRITE | KEY_NEED_LINK | KEY_NEED_SETATTR))
request = MAY_WRITE;
request |= MAY_WRITE;
rc = smk_access(tkp, keyp->security, request, &ad);
rc = smk_bu_note("key access", tkp, keyp->security, request, rc);
return rc;