From: Casey Schaufler <casey@schaufler-ca.com>
To: casey.schaufler@intel.com, jmorris@namei.org,
linux-security-module@vger.kernel.org, selinux@vger.kernel.org
Cc: casey@schaufler-ca.com, keescook@chromium.org,
john.johansen@canonical.com, penguin-kernel@i-love.sakura.ne.jp,
paul@paul-moore.com, sds@tycho.nsa.gov
Subject: [PATCH v11 05/25] net: Prepare UDS for security module stacking
Date: Wed, 13 Nov 2019 09:57:01 -0800 [thread overview]
Message-ID: <20191113175721.2317-6-casey@schaufler-ca.com> (raw)
In-Reply-To: <20191113175721.2317-1-casey@schaufler-ca.com>
Change the data used in UDS SO_PEERSEC processing from a
secid to a more general struct lsmblob. Update the
security_socket_getpeersec_dgram() interface to use the
lsmblob. There is a small amount of scaffolding code
that will come out when the security_secid_to_secctx()
code is brought in line with the lsmblob.
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: John Johansen <john.johansen@canonical.com>
Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
cc: netdev@vger.kernel.org
---
include/linux/security.h | 7 +++++--
include/net/af_unix.h | 2 +-
include/net/scm.h | 8 +++++---
net/ipv4/ip_sockglue.c | 8 +++++---
net/unix/af_unix.c | 6 +++---
security/security.c | 18 +++++++++++++++---
6 files changed, 34 insertions(+), 15 deletions(-)
diff --git a/include/linux/security.h b/include/linux/security.h
index 2b0ab47cfb26..d57f400a307e 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -1354,7 +1354,8 @@ int security_socket_shutdown(struct socket *sock, int how);
int security_sock_rcv_skb(struct sock *sk, struct sk_buff *skb);
int security_socket_getpeersec_stream(struct socket *sock, char __user *optval,
int __user *optlen, unsigned len);
-int security_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *skb, u32 *secid);
+int security_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *skb,
+ struct lsmblob *blob);
int security_sk_alloc(struct sock *sk, int family, gfp_t priority);
void security_sk_free(struct sock *sk);
void security_sk_clone(const struct sock *sk, struct sock *newsk);
@@ -1492,7 +1493,9 @@ static inline int security_socket_getpeersec_stream(struct socket *sock, char __
return -ENOPROTOOPT;
}
-static inline int security_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *skb, u32 *secid)
+static inline int security_socket_getpeersec_dgram(struct socket *sock,
+ struct sk_buff *skb,
+ struct lsmblob *blob)
{
return -ENOPROTOOPT;
}
diff --git a/include/net/af_unix.h b/include/net/af_unix.h
index 3426d6dacc45..933492c08b8c 100644
--- a/include/net/af_unix.h
+++ b/include/net/af_unix.h
@@ -36,7 +36,7 @@ struct unix_skb_parms {
kgid_t gid;
struct scm_fp_list *fp; /* Passed files */
#ifdef CONFIG_SECURITY_NETWORK
- u32 secid; /* Security ID */
+ struct lsmblob lsmblob; /* Security LSM data */
#endif
u32 consumed;
} __randomize_layout;
diff --git a/include/net/scm.h b/include/net/scm.h
index 1ce365f4c256..e2e71c4bf9d0 100644
--- a/include/net/scm.h
+++ b/include/net/scm.h
@@ -33,7 +33,7 @@ struct scm_cookie {
struct scm_fp_list *fp; /* Passed files */
struct scm_creds creds; /* Skb credentials */
#ifdef CONFIG_SECURITY_NETWORK
- u32 secid; /* Passed security ID */
+ struct lsmblob lsmblob; /* Passed LSM data */
#endif
};
@@ -46,7 +46,7 @@ struct scm_fp_list *scm_fp_dup(struct scm_fp_list *fpl);
#ifdef CONFIG_SECURITY_NETWORK
static __inline__ void unix_get_peersec_dgram(struct socket *sock, struct scm_cookie *scm)
{
- security_socket_getpeersec_dgram(sock, NULL, &scm->secid);
+ security_socket_getpeersec_dgram(sock, NULL, &scm->lsmblob);
}
#else
static __inline__ void unix_get_peersec_dgram(struct socket *sock, struct scm_cookie *scm)
@@ -97,7 +97,9 @@ static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct sc
int err;
if (test_bit(SOCK_PASSSEC, &sock->flags)) {
- err = security_secid_to_secctx(scm->secid, &secdata, &seclen);
+ /* Scaffolding - it has to be element 0 for now */
+ err = security_secid_to_secctx(scm->lsmblob.secid[0],
+ &secdata, &seclen);
if (!err) {
put_cmsg(msg, SOL_SOCKET, SCM_SECURITY, seclen, secdata);
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index aa3fd61818c4..6cf57d5ac899 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -130,15 +130,17 @@ static void ip_cmsg_recv_checksum(struct msghdr *msg, struct sk_buff *skb,
static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
{
+ struct lsmblob lb;
char *secdata;
- u32 seclen, secid;
+ u32 seclen;
int err;
- err = security_socket_getpeersec_dgram(NULL, skb, &secid);
+ err = security_socket_getpeersec_dgram(NULL, skb, &lb);
if (err)
return;
- err = security_secid_to_secctx(secid, &secdata, &seclen);
+ /* Scaffolding - it has to be element 0 */
+ err = security_secid_to_secctx(lb.secid[0], &secdata, &seclen);
if (err)
return;
diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index 0d8da809bea2..189fd6644e7f 100644
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -138,17 +138,17 @@ static struct hlist_head *unix_sockets_unbound(void *addr)
#ifdef CONFIG_SECURITY_NETWORK
static void unix_get_secdata(struct scm_cookie *scm, struct sk_buff *skb)
{
- UNIXCB(skb).secid = scm->secid;
+ UNIXCB(skb).lsmblob = scm->lsmblob;
}
static inline void unix_set_secdata(struct scm_cookie *scm, struct sk_buff *skb)
{
- scm->secid = UNIXCB(skb).secid;
+ scm->lsmblob = UNIXCB(skb).lsmblob;
}
static inline bool unix_secdata_eq(struct scm_cookie *scm, struct sk_buff *skb)
{
- return (scm->secid == UNIXCB(skb).secid);
+ return lsmblob_equal(&scm->lsmblob, &(UNIXCB(skb).lsmblob));
}
#else
static inline void unix_get_secdata(struct scm_cookie *scm, struct sk_buff *skb)
diff --git a/security/security.c b/security/security.c
index dd6f212e11af..55837706e3ef 100644
--- a/security/security.c
+++ b/security/security.c
@@ -2108,10 +2108,22 @@ int security_socket_getpeersec_stream(struct socket *sock, char __user *optval,
optval, optlen, len);
}
-int security_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *skb, u32 *secid)
+int security_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *skb,
+ struct lsmblob *blob)
{
- return call_int_hook(socket_getpeersec_dgram, -ENOPROTOOPT, sock,
- skb, secid);
+ struct security_hook_list *hp;
+ int rc = -ENOPROTOOPT;
+
+ hlist_for_each_entry(hp, &security_hook_heads.socket_getpeersec_dgram,
+ list) {
+ if (WARN_ON(hp->lsmid->slot < 0 || hp->lsmid->slot >= lsm_slot))
+ continue;
+ rc = hp->hook.socket_getpeersec_dgram(sock, skb,
+ &blob->secid[hp->lsmid->slot]);
+ if (rc != 0)
+ break;
+ }
+ return rc;
}
EXPORT_SYMBOL(security_socket_getpeersec_dgram);
--
2.20.1
next prev parent reply other threads:[~2019-11-13 17:57 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20191113175721.2317-1-casey.ref@schaufler-ca.com>
2019-11-13 17:56 ` [PATCH v11 00/25] LSM: Module stacking for AppArmor Casey Schaufler
2019-11-13 17:56 ` [PATCH v11 01/25] LSM: Infrastructure management of the sock security Casey Schaufler
2019-11-13 17:56 ` [PATCH v11 02/25] LSM: Create and manage the lsmblob data structure Casey Schaufler
2019-11-21 5:36 ` James Morris
2019-11-13 17:56 ` [PATCH v11 03/25] LSM: Use lsmblob in security_audit_rule_match Casey Schaufler
2019-11-21 5:38 ` James Morris
2019-11-13 17:57 ` [PATCH v11 04/25] LSM: Use lsmblob in security_kernel_act_as Casey Schaufler
2019-11-13 17:57 ` Casey Schaufler [this message]
2019-11-13 17:57 ` [PATCH v11 06/25] LSM: Use lsmblob in security_secctx_to_secid Casey Schaufler
2019-11-13 17:57 ` [PATCH v11 07/25] LSM: Use lsmblob in security_secid_to_secctx Casey Schaufler
2019-11-13 17:57 ` [PATCH v11 08/25] LSM: Use lsmblob in security_ipc_getsecid Casey Schaufler
2019-11-13 17:57 ` [PATCH v11 09/25] LSM: Use lsmblob in security_task_getsecid Casey Schaufler
2019-11-13 17:57 ` [PATCH v11 10/25] LSM: Use lsmblob in security_inode_getsecid Casey Schaufler
2019-11-13 17:57 ` [PATCH v11 11/25] LSM: Use lsmblob in security_cred_getsecid Casey Schaufler
2019-11-13 17:57 ` [PATCH v11 12/25] IMA: Change internal interfaces to use lsmblobs Casey Schaufler
2019-11-13 17:57 ` [PATCH v11 13/25] LSM: Specify which LSM to display Casey Schaufler
2019-11-13 17:57 ` [PATCH v11 14/25] LSM: Ensure the correct LSM context releaser Casey Schaufler
2019-11-13 17:57 ` [PATCH v11 15/25] LSM: Use lsmcontext in security_secid_to_secctx Casey Schaufler
2019-11-13 17:57 ` [PATCH v11 16/25] LSM: Use lsmcontext in security_dentry_init_security Casey Schaufler
2019-11-13 17:57 ` [PATCH v11 17/25] LSM: Use lsmcontext in security_inode_getsecctx Casey Schaufler
2019-11-21 5:50 ` James Morris
2019-11-13 17:57 ` [PATCH v11 18/25] LSM: security_secid_to_secctx in netlink netfilter Casey Schaufler
2019-11-13 18:19 [PATCH v11 00/25] LSM: Module stacking for AppArmor Casey Schaufler
2019-11-13 18:19 ` [PATCH v11 05/25] net: Prepare UDS for security module stacking Casey Schaufler
2019-11-21 18:41 ` John Johansen
-- strict thread matches above, loose matches on Subject: below --
2019-11-13 16:50 [PATCH v11 00/25] LSM: Module stacking for AppArmor Casey Schaufler
2019-11-13 16:50 ` [PATCH v11 05/25] net: Prepare UDS for security module stacking Casey Schaufler
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