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| author | Harry Ciao <qingtao.cao@windriver.com> | 2011-03-02 13:32:34 +0800 |
|---|---|---|
| committer | Eric Paris <eparis@redhat.com> | 2011-03-03 15:19:44 -0500 |
| commit | 2ad18bdf3b8f84c85c7da7e4de365f7c5701fb3f (patch) | |
| tree | 7b45743dee9e9de69714da3801aa3f987a3db365 /security/selinux | |
| parent | 6f5317e730505d5cbc851c435a2dfe3d5a21d343 (diff) | |
| download | lwn-2ad18bdf3b8f84c85c7da7e4de365f7c5701fb3f.tar.gz lwn-2ad18bdf3b8f84c85c7da7e4de365f7c5701fb3f.zip | |
SELinux: Compute SID for the newly created socket
The security context for the newly created socket shares the same
user, role and MLS attribute as its creator but may have a different
type, which could be specified by a type_transition rule in the relevant
policy package.
Signed-off-by: Harry Ciao <qingtao.cao@windriver.com>
[fix call to security_transition_sid to include qstr, Eric Paris]
Signed-off-by: Eric Paris <eparis@redhat.com>
Acked-by: Stephen Smalley <sds@tycho.nsa.gov>
Diffstat (limited to 'security/selinux')
| -rw-r--r-- | security/selinux/hooks.c | 27 |
1 files changed, 21 insertions, 6 deletions
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index 8294dbfd1f16..3decf07b8dc1 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -3591,9 +3591,16 @@ static int selinux_skb_peerlbl_sid(struct sk_buff *skb, u16 family, u32 *sid) /* socket security operations */ -static u32 socket_sockcreate_sid(const struct task_security_struct *tsec) +static int socket_sockcreate_sid(const struct task_security_struct *tsec, + u16 secclass, u32 *socksid) { - return tsec->sockcreate_sid ? : tsec->sid; + if (tsec->sockcreate_sid > SECSID_NULL) { + *socksid = tsec->sockcreate_sid; + return 0; + } + + return security_transition_sid(tsec->sid, tsec->sid, secclass, NULL, + socksid); } static int sock_has_perm(struct task_struct *task, struct sock *sk, u32 perms) @@ -3617,12 +3624,16 @@ static int selinux_socket_create(int family, int type, const struct task_security_struct *tsec = current_security(); u32 newsid; u16 secclass; + int rc; if (kern) return 0; - newsid = socket_sockcreate_sid(tsec); secclass = socket_type_to_security_class(family, type, protocol); + rc = socket_sockcreate_sid(tsec, secclass, &newsid); + if (rc) + return rc; + return avc_has_perm(tsec->sid, newsid, secclass, SOCKET__CREATE, NULL); } @@ -3634,12 +3645,16 @@ static int selinux_socket_post_create(struct socket *sock, int family, struct sk_security_struct *sksec; int err = 0; + isec->sclass = socket_type_to_security_class(family, type, protocol); + if (kern) isec->sid = SECINITSID_KERNEL; - else - isec->sid = socket_sockcreate_sid(tsec); + else { + err = socket_sockcreate_sid(tsec, isec->sclass, &(isec->sid)); + if (err) + return err; + } - isec->sclass = socket_type_to_security_class(family, type, protocol); isec->initialized = 1; if (sock->sk) { |