[LSM-IPSec]: Per-packet access control.
This patch series implements per packet access control via the
extension of the Linux Security Modules (LSM) interface by hooks in
the XFRM and pfkey subsystems that leverage IPSec security
associations to label packets. Extensions to the SELinux LSM are
included that leverage the patch for this purpose.
This patch implements the changes necessary to the SELinux LSM to
create, deallocate, and use security contexts for policies
(xfrm_policy) and security associations (xfrm_state) that enable
control of a socket's ability to send and receive packets.
Patch purpose:
The patch is designed to enable the SELinux LSM to implement access
control on individual packets based on the strongly authenticated
IPSec security association. Such access controls augment the existing
ones in SELinux based on network interface and IP address. The former
are very coarse-grained, and the latter can be spoofed. By using
IPSec, the SELinux can control access to remote hosts based on
cryptographic keys generated using the IPSec mechanism. This enables
access control on a per-machine basis or per-application if the remote
machine is running the same mechanism and trusted to enforce the
access control policy.
Patch design approach:
The patch's main function is to authorize a socket's access to a IPSec
policy based on their security contexts. Since the communication is
implemented by a security association, the patch ensures that the
security association's negotiated and used have the same security
context. The patch enables allocation and deallocation of such
security contexts for policies and security associations. It also
enables copying of the security context when policies are cloned.
Lastly, the patch ensures that packets that are sent without using a
IPSec security assocation with a security context are allowed to be
sent in that manner.
A presentation available at
www.selinux-symposium.org/2005/presentations/session2/2-3-jaeger.pdf
from the SELinux symposium describes the overall approach.
Patch implementation details:
The function which authorizes a socket to perform a requested
operation (send/receive) on a IPSec policy (xfrm_policy) is
selinux_xfrm_policy_lookup. The Netfilter and rcv_skb hooks ensure
that if a IPSec SA with a securit y association has not been used,
then the socket is allowed to send or receive the packet,
respectively.
The patch implements SELinux function for allocating security contexts
when policies (xfrm_policy) are created via the pfkey or xfrm_user
interfaces via selinux_xfrm_policy_alloc. When a security association
is built, SELinux allocates the security context designated by the
XFRM subsystem which is based on that of the authorized policy via
selinux_xfrm_state_alloc.
When a xfrm_policy is cloned, the security context of that policy, if
any, is copied to the clone via selinux_xfrm_policy_clone.
When a xfrm_policy or xfrm_state is freed, its security context, if
any is also freed at selinux_xfrm_policy_free or
selinux_xfrm_state_free.
Testing:
The SELinux authorization function is tested using ipsec-tools. We
created policies and security associations with particular security
contexts and added SELinux access control policy entries to verify the
authorization decision. We also made sure that packets for which no
security context was supplied (which either did or did not use
security associations) were authorized using an unlabelled context.
Signed-off-by: Trent Jaeger <tjaeger@cse.psu.edu>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-12-14 00:12:40 -07:00
|
|
|
/*
|
|
|
|
* NSA Security-Enhanced Linux (SELinux) security module
|
|
|
|
*
|
|
|
|
* This file contains the SELinux XFRM hook function implementations.
|
|
|
|
*
|
|
|
|
* Authors: Serge Hallyn <sergeh@us.ibm.com>
|
|
|
|
* Trent Jaeger <jaegert@us.ibm.com>
|
|
|
|
*
|
|
|
|
* Copyright (C) 2005 International Business Machines Corporation
|
|
|
|
*
|
|
|
|
* This program is free software; you can redistribute it and/or modify
|
|
|
|
* it under the terms of the GNU General Public License version 2,
|
|
|
|
* as published by the Free Software Foundation.
|
|
|
|
*/
|
|
|
|
|
|
|
|
/*
|
|
|
|
* USAGE:
|
|
|
|
* NOTES:
|
|
|
|
* 1. Make sure to enable the following options in your kernel config:
|
|
|
|
* CONFIG_SECURITY=y
|
|
|
|
* CONFIG_SECURITY_NETWORK=y
|
|
|
|
* CONFIG_SECURITY_NETWORK_XFRM=y
|
|
|
|
* CONFIG_SECURITY_SELINUX=m/y
|
|
|
|
* ISSUES:
|
|
|
|
* 1. Caching packets, so they are not dropped during negotiation
|
|
|
|
* 2. Emulating a reasonable SO_PEERSEC across machines
|
|
|
|
* 3. Testing addition of sk_policy's with security context via setsockopt
|
|
|
|
*/
|
|
|
|
#include <linux/config.h>
|
|
|
|
#include <linux/module.h>
|
|
|
|
#include <linux/kernel.h>
|
|
|
|
#include <linux/init.h>
|
|
|
|
#include <linux/security.h>
|
|
|
|
#include <linux/types.h>
|
|
|
|
#include <linux/netfilter.h>
|
|
|
|
#include <linux/netfilter_ipv4.h>
|
|
|
|
#include <linux/netfilter_ipv6.h>
|
|
|
|
#include <linux/ip.h>
|
|
|
|
#include <linux/tcp.h>
|
|
|
|
#include <linux/skbuff.h>
|
|
|
|
#include <linux/xfrm.h>
|
|
|
|
#include <net/xfrm.h>
|
|
|
|
#include <net/checksum.h>
|
|
|
|
#include <net/udp.h>
|
|
|
|
#include <asm/semaphore.h>
|
|
|
|
|
|
|
|
#include "avc.h"
|
|
|
|
#include "objsec.h"
|
|
|
|
#include "xfrm.h"
|
|
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Returns true if an LSM/SELinux context
|
|
|
|
*/
|
|
|
|
static inline int selinux_authorizable_ctx(struct xfrm_sec_ctx *ctx)
|
|
|
|
{
|
|
|
|
return (ctx &&
|
|
|
|
(ctx->ctx_doi == XFRM_SC_DOI_LSM) &&
|
|
|
|
(ctx->ctx_alg == XFRM_SC_ALG_SELINUX));
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Returns true if the xfrm contains a security blob for SELinux
|
|
|
|
*/
|
|
|
|
static inline int selinux_authorizable_xfrm(struct xfrm_state *x)
|
|
|
|
{
|
|
|
|
return selinux_authorizable_ctx(x->security);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* LSM hook implementation that authorizes that a socket can be used
|
|
|
|
* with the corresponding xfrm_sec_ctx and direction.
|
|
|
|
*/
|
|
|
|
int selinux_xfrm_policy_lookup(struct xfrm_policy *xp, u32 sk_sid, u8 dir)
|
|
|
|
{
|
|
|
|
int rc = 0;
|
|
|
|
u32 sel_sid = SECINITSID_UNLABELED;
|
|
|
|
struct xfrm_sec_ctx *ctx;
|
|
|
|
|
|
|
|
/* Context sid is either set to label or ANY_ASSOC */
|
|
|
|
if ((ctx = xp->security)) {
|
|
|
|
if (!selinux_authorizable_ctx(ctx))
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
sel_sid = ctx->ctx_sid;
|
|
|
|
}
|
|
|
|
|
|
|
|
rc = avc_has_perm(sk_sid, sel_sid, SECCLASS_ASSOCIATION,
|
|
|
|
((dir == FLOW_DIR_IN) ? ASSOCIATION__RECVFROM :
|
|
|
|
((dir == FLOW_DIR_OUT) ? ASSOCIATION__SENDTO :
|
|
|
|
(ASSOCIATION__SENDTO | ASSOCIATION__RECVFROM))),
|
|
|
|
NULL);
|
|
|
|
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Security blob allocation for xfrm_policy and xfrm_state
|
|
|
|
* CTX does not have a meaningful value on input
|
|
|
|
*/
|
|
|
|
static int selinux_xfrm_sec_ctx_alloc(struct xfrm_sec_ctx **ctxp, struct xfrm_user_sec_ctx *uctx)
|
|
|
|
{
|
|
|
|
int rc = 0;
|
|
|
|
struct task_security_struct *tsec = current->security;
|
|
|
|
struct xfrm_sec_ctx *ctx;
|
|
|
|
|
|
|
|
BUG_ON(!uctx);
|
|
|
|
BUG_ON(uctx->ctx_doi != XFRM_SC_ALG_SELINUX);
|
|
|
|
|
|
|
|
if (uctx->ctx_len >= PAGE_SIZE)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
*ctxp = ctx = kmalloc(sizeof(*ctx) +
|
|
|
|
uctx->ctx_len,
|
|
|
|
GFP_KERNEL);
|
|
|
|
|
|
|
|
if (!ctx)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
ctx->ctx_doi = uctx->ctx_doi;
|
|
|
|
ctx->ctx_len = uctx->ctx_len;
|
|
|
|
ctx->ctx_alg = uctx->ctx_alg;
|
|
|
|
|
|
|
|
memcpy(ctx->ctx_str,
|
|
|
|
uctx+1,
|
|
|
|
ctx->ctx_len);
|
|
|
|
rc = security_context_to_sid(ctx->ctx_str,
|
|
|
|
ctx->ctx_len,
|
|
|
|
&ctx->ctx_sid);
|
|
|
|
|
|
|
|
if (rc)
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Does the subject have permission to set security or permission to
|
|
|
|
* do the relabel?
|
|
|
|
* Must be permitted to relabel from default socket type (process type)
|
|
|
|
* to specified context
|
|
|
|
*/
|
|
|
|
rc = avc_has_perm(tsec->sid, ctx->ctx_sid,
|
|
|
|
SECCLASS_ASSOCIATION,
|
2006-01-06 14:22:39 -07:00
|
|
|
ASSOCIATION__SETCONTEXT, NULL);
|
[LSM-IPSec]: Per-packet access control.
This patch series implements per packet access control via the
extension of the Linux Security Modules (LSM) interface by hooks in
the XFRM and pfkey subsystems that leverage IPSec security
associations to label packets. Extensions to the SELinux LSM are
included that leverage the patch for this purpose.
This patch implements the changes necessary to the SELinux LSM to
create, deallocate, and use security contexts for policies
(xfrm_policy) and security associations (xfrm_state) that enable
control of a socket's ability to send and receive packets.
Patch purpose:
The patch is designed to enable the SELinux LSM to implement access
control on individual packets based on the strongly authenticated
IPSec security association. Such access controls augment the existing
ones in SELinux based on network interface and IP address. The former
are very coarse-grained, and the latter can be spoofed. By using
IPSec, the SELinux can control access to remote hosts based on
cryptographic keys generated using the IPSec mechanism. This enables
access control on a per-machine basis or per-application if the remote
machine is running the same mechanism and trusted to enforce the
access control policy.
Patch design approach:
The patch's main function is to authorize a socket's access to a IPSec
policy based on their security contexts. Since the communication is
implemented by a security association, the patch ensures that the
security association's negotiated and used have the same security
context. The patch enables allocation and deallocation of such
security contexts for policies and security associations. It also
enables copying of the security context when policies are cloned.
Lastly, the patch ensures that packets that are sent without using a
IPSec security assocation with a security context are allowed to be
sent in that manner.
A presentation available at
www.selinux-symposium.org/2005/presentations/session2/2-3-jaeger.pdf
from the SELinux symposium describes the overall approach.
Patch implementation details:
The function which authorizes a socket to perform a requested
operation (send/receive) on a IPSec policy (xfrm_policy) is
selinux_xfrm_policy_lookup. The Netfilter and rcv_skb hooks ensure
that if a IPSec SA with a securit y association has not been used,
then the socket is allowed to send or receive the packet,
respectively.
The patch implements SELinux function for allocating security contexts
when policies (xfrm_policy) are created via the pfkey or xfrm_user
interfaces via selinux_xfrm_policy_alloc. When a security association
is built, SELinux allocates the security context designated by the
XFRM subsystem which is based on that of the authorized policy via
selinux_xfrm_state_alloc.
When a xfrm_policy is cloned, the security context of that policy, if
any, is copied to the clone via selinux_xfrm_policy_clone.
When a xfrm_policy or xfrm_state is freed, its security context, if
any is also freed at selinux_xfrm_policy_free or
selinux_xfrm_state_free.
Testing:
The SELinux authorization function is tested using ipsec-tools. We
created policies and security associations with particular security
contexts and added SELinux access control policy entries to verify the
authorization decision. We also made sure that packets for which no
security context was supplied (which either did or did not use
security associations) were authorized using an unlabelled context.
Signed-off-by: Trent Jaeger <tjaeger@cse.psu.edu>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-12-14 00:12:40 -07:00
|
|
|
if (rc)
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
return rc;
|
|
|
|
|
|
|
|
out:
|
2006-01-06 23:59:43 -07:00
|
|
|
*ctxp = NULL;
|
[LSM-IPSec]: Per-packet access control.
This patch series implements per packet access control via the
extension of the Linux Security Modules (LSM) interface by hooks in
the XFRM and pfkey subsystems that leverage IPSec security
associations to label packets. Extensions to the SELinux LSM are
included that leverage the patch for this purpose.
This patch implements the changes necessary to the SELinux LSM to
create, deallocate, and use security contexts for policies
(xfrm_policy) and security associations (xfrm_state) that enable
control of a socket's ability to send and receive packets.
Patch purpose:
The patch is designed to enable the SELinux LSM to implement access
control on individual packets based on the strongly authenticated
IPSec security association. Such access controls augment the existing
ones in SELinux based on network interface and IP address. The former
are very coarse-grained, and the latter can be spoofed. By using
IPSec, the SELinux can control access to remote hosts based on
cryptographic keys generated using the IPSec mechanism. This enables
access control on a per-machine basis or per-application if the remote
machine is running the same mechanism and trusted to enforce the
access control policy.
Patch design approach:
The patch's main function is to authorize a socket's access to a IPSec
policy based on their security contexts. Since the communication is
implemented by a security association, the patch ensures that the
security association's negotiated and used have the same security
context. The patch enables allocation and deallocation of such
security contexts for policies and security associations. It also
enables copying of the security context when policies are cloned.
Lastly, the patch ensures that packets that are sent without using a
IPSec security assocation with a security context are allowed to be
sent in that manner.
A presentation available at
www.selinux-symposium.org/2005/presentations/session2/2-3-jaeger.pdf
from the SELinux symposium describes the overall approach.
Patch implementation details:
The function which authorizes a socket to perform a requested
operation (send/receive) on a IPSec policy (xfrm_policy) is
selinux_xfrm_policy_lookup. The Netfilter and rcv_skb hooks ensure
that if a IPSec SA with a securit y association has not been used,
then the socket is allowed to send or receive the packet,
respectively.
The patch implements SELinux function for allocating security contexts
when policies (xfrm_policy) are created via the pfkey or xfrm_user
interfaces via selinux_xfrm_policy_alloc. When a security association
is built, SELinux allocates the security context designated by the
XFRM subsystem which is based on that of the authorized policy via
selinux_xfrm_state_alloc.
When a xfrm_policy is cloned, the security context of that policy, if
any, is copied to the clone via selinux_xfrm_policy_clone.
When a xfrm_policy or xfrm_state is freed, its security context, if
any is also freed at selinux_xfrm_policy_free or
selinux_xfrm_state_free.
Testing:
The SELinux authorization function is tested using ipsec-tools. We
created policies and security associations with particular security
contexts and added SELinux access control policy entries to verify the
authorization decision. We also made sure that packets for which no
security context was supplied (which either did or did not use
security associations) were authorized using an unlabelled context.
Signed-off-by: Trent Jaeger <tjaeger@cse.psu.edu>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-12-14 00:12:40 -07:00
|
|
|
kfree(ctx);
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* LSM hook implementation that allocs and transfers uctx spec to
|
|
|
|
* xfrm_policy.
|
|
|
|
*/
|
|
|
|
int selinux_xfrm_policy_alloc(struct xfrm_policy *xp, struct xfrm_user_sec_ctx *uctx)
|
|
|
|
{
|
|
|
|
int err;
|
|
|
|
|
|
|
|
BUG_ON(!xp);
|
|
|
|
|
|
|
|
err = selinux_xfrm_sec_ctx_alloc(&xp->security, uctx);
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
* LSM hook implementation that copies security data structure from old to
|
|
|
|
* new for policy cloning.
|
|
|
|
*/
|
|
|
|
int selinux_xfrm_policy_clone(struct xfrm_policy *old, struct xfrm_policy *new)
|
|
|
|
{
|
|
|
|
struct xfrm_sec_ctx *old_ctx, *new_ctx;
|
|
|
|
|
|
|
|
old_ctx = old->security;
|
|
|
|
|
|
|
|
if (old_ctx) {
|
|
|
|
new_ctx = new->security = kmalloc(sizeof(*new_ctx) +
|
|
|
|
old_ctx->ctx_len,
|
|
|
|
GFP_KERNEL);
|
|
|
|
|
|
|
|
if (!new_ctx)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
memcpy(new_ctx, old_ctx, sizeof(*new_ctx));
|
|
|
|
memcpy(new_ctx->ctx_str, old_ctx->ctx_str, new_ctx->ctx_len);
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* LSM hook implementation that frees xfrm_policy security information.
|
|
|
|
*/
|
|
|
|
void selinux_xfrm_policy_free(struct xfrm_policy *xp)
|
|
|
|
{
|
|
|
|
struct xfrm_sec_ctx *ctx = xp->security;
|
|
|
|
if (ctx)
|
|
|
|
kfree(ctx);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* LSM hook implementation that allocs and transfers sec_ctx spec to
|
|
|
|
* xfrm_state.
|
|
|
|
*/
|
|
|
|
int selinux_xfrm_state_alloc(struct xfrm_state *x, struct xfrm_user_sec_ctx *uctx)
|
|
|
|
{
|
|
|
|
int err;
|
|
|
|
|
|
|
|
BUG_ON(!x);
|
|
|
|
|
|
|
|
err = selinux_xfrm_sec_ctx_alloc(&x->security, uctx);
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* LSM hook implementation that frees xfrm_state security information.
|
|
|
|
*/
|
|
|
|
void selinux_xfrm_state_free(struct xfrm_state *x)
|
|
|
|
{
|
|
|
|
struct xfrm_sec_ctx *ctx = x->security;
|
|
|
|
if (ctx)
|
|
|
|
kfree(ctx);
|
|
|
|
}
|
|
|
|
|
[SECURITY]: TCP/UDP getpeersec
This patch implements an application of the LSM-IPSec networking
controls whereby an application can determine the label of the
security association its TCP or UDP sockets are currently connected to
via getsockopt and the auxiliary data mechanism of recvmsg.
Patch purpose:
This patch enables a security-aware application to retrieve the
security context of an IPSec security association a particular TCP or
UDP socket is using. The application can then use this security
context to determine the security context for processing on behalf of
the peer at the other end of this connection. In the case of UDP, the
security context is for each individual packet. An example
application is the inetd daemon, which could be modified to start
daemons running at security contexts dependent on the remote client.
Patch design approach:
- Design for TCP
The patch enables the SELinux LSM to set the peer security context for
a socket based on the security context of the IPSec security
association. The application may retrieve this context using
getsockopt. When called, the kernel determines if the socket is a
connected (TCP_ESTABLISHED) TCP socket and, if so, uses the dst_entry
cache on the socket to retrieve the security associations. If a
security association has a security context, the context string is
returned, as for UNIX domain sockets.
- Design for UDP
Unlike TCP, UDP is connectionless. This requires a somewhat different
API to retrieve the peer security context. With TCP, the peer
security context stays the same throughout the connection, thus it can
be retrieved at any time between when the connection is established
and when it is torn down. With UDP, each read/write can have
different peer and thus the security context might change every time.
As a result the security context retrieval must be done TOGETHER with
the packet retrieval.
The solution is to build upon the existing Unix domain socket API for
retrieving user credentials. Linux offers the API for obtaining user
credentials via ancillary messages (i.e., out of band/control messages
that are bundled together with a normal message).
Patch implementation details:
- Implementation for TCP
The security context can be retrieved by applications using getsockopt
with the existing SO_PEERSEC flag. As an example (ignoring error
checking):
getsockopt(sockfd, SOL_SOCKET, SO_PEERSEC, optbuf, &optlen);
printf("Socket peer context is: %s\n", optbuf);
The SELinux function, selinux_socket_getpeersec, is extended to check
for labeled security associations for connected (TCP_ESTABLISHED ==
sk->sk_state) TCP sockets only. If so, the socket has a dst_cache of
struct dst_entry values that may refer to security associations. If
these have security associations with security contexts, the security
context is returned.
getsockopt returns a buffer that contains a security context string or
the buffer is unmodified.
- Implementation for UDP
To retrieve the security context, the application first indicates to
the kernel such desire by setting the IP_PASSSEC option via
getsockopt. Then the application retrieves the security context using
the auxiliary data mechanism.
An example server application for UDP should look like this:
toggle = 1;
toggle_len = sizeof(toggle);
setsockopt(sockfd, SOL_IP, IP_PASSSEC, &toggle, &toggle_len);
recvmsg(sockfd, &msg_hdr, 0);
if (msg_hdr.msg_controllen > sizeof(struct cmsghdr)) {
cmsg_hdr = CMSG_FIRSTHDR(&msg_hdr);
if (cmsg_hdr->cmsg_len <= CMSG_LEN(sizeof(scontext)) &&
cmsg_hdr->cmsg_level == SOL_IP &&
cmsg_hdr->cmsg_type == SCM_SECURITY) {
memcpy(&scontext, CMSG_DATA(cmsg_hdr), sizeof(scontext));
}
}
ip_setsockopt is enhanced with a new socket option IP_PASSSEC to allow
a server socket to receive security context of the peer. A new
ancillary message type SCM_SECURITY.
When the packet is received we get the security context from the
sec_path pointer which is contained in the sk_buff, and copy it to the
ancillary message space. An additional LSM hook,
selinux_socket_getpeersec_udp, is defined to retrieve the security
context from the SELinux space. The existing function,
selinux_socket_getpeersec does not suit our purpose, because the
security context is copied directly to user space, rather than to
kernel space.
Testing:
We have tested the patch by setting up TCP and UDP connections between
applications on two machines using the IPSec policies that result in
labeled security associations being built. For TCP, we can then
extract the peer security context using getsockopt on either end. For
UDP, the receiving end can retrieve the security context using the
auxiliary data mechanism of recvmsg.
Signed-off-by: Catherine Zhang <cxzhang@watson.ibm.com>
Acked-by: James Morris <jmorris@namei.org>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 23:41:23 -07:00
|
|
|
/*
|
|
|
|
* SELinux internal function to retrieve the context of a connected
|
|
|
|
* (sk->sk_state == TCP_ESTABLISHED) TCP socket based on its security
|
|
|
|
* association used to connect to the remote socket.
|
|
|
|
*
|
|
|
|
* Retrieve via getsockopt SO_PEERSEC.
|
|
|
|
*/
|
|
|
|
u32 selinux_socket_getpeer_stream(struct sock *sk)
|
|
|
|
{
|
|
|
|
struct dst_entry *dst, *dst_test;
|
|
|
|
u32 peer_sid = SECSID_NULL;
|
|
|
|
|
|
|
|
if (sk->sk_state != TCP_ESTABLISHED)
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
dst = sk_dst_get(sk);
|
|
|
|
if (!dst)
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
for (dst_test = dst; dst_test != 0;
|
|
|
|
dst_test = dst_test->child) {
|
|
|
|
struct xfrm_state *x = dst_test->xfrm;
|
|
|
|
|
|
|
|
if (x && selinux_authorizable_xfrm(x)) {
|
|
|
|
struct xfrm_sec_ctx *ctx = x->security;
|
|
|
|
peer_sid = ctx->ctx_sid;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
dst_release(dst);
|
|
|
|
|
|
|
|
out:
|
|
|
|
return peer_sid;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* SELinux internal function to retrieve the context of a UDP packet
|
|
|
|
* based on its security association used to connect to the remote socket.
|
|
|
|
*
|
|
|
|
* Retrieve via setsockopt IP_PASSSEC and recvmsg with control message
|
|
|
|
* type SCM_SECURITY.
|
|
|
|
*/
|
|
|
|
u32 selinux_socket_getpeer_dgram(struct sk_buff *skb)
|
|
|
|
{
|
|
|
|
struct sec_path *sp;
|
|
|
|
|
|
|
|
if (skb == NULL)
|
|
|
|
return SECSID_NULL;
|
|
|
|
|
|
|
|
if (skb->sk->sk_protocol != IPPROTO_UDP)
|
|
|
|
return SECSID_NULL;
|
|
|
|
|
|
|
|
sp = skb->sp;
|
|
|
|
if (sp) {
|
|
|
|
int i;
|
|
|
|
|
|
|
|
for (i = sp->len-1; i >= 0; i--) {
|
|
|
|
struct xfrm_state *x = sp->x[i].xvec;
|
|
|
|
if (selinux_authorizable_xfrm(x)) {
|
|
|
|
struct xfrm_sec_ctx *ctx = x->security;
|
|
|
|
return ctx->ctx_sid;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
return SECSID_NULL;
|
|
|
|
}
|
|
|
|
|
[LSM-IPSec]: Per-packet access control.
This patch series implements per packet access control via the
extension of the Linux Security Modules (LSM) interface by hooks in
the XFRM and pfkey subsystems that leverage IPSec security
associations to label packets. Extensions to the SELinux LSM are
included that leverage the patch for this purpose.
This patch implements the changes necessary to the SELinux LSM to
create, deallocate, and use security contexts for policies
(xfrm_policy) and security associations (xfrm_state) that enable
control of a socket's ability to send and receive packets.
Patch purpose:
The patch is designed to enable the SELinux LSM to implement access
control on individual packets based on the strongly authenticated
IPSec security association. Such access controls augment the existing
ones in SELinux based on network interface and IP address. The former
are very coarse-grained, and the latter can be spoofed. By using
IPSec, the SELinux can control access to remote hosts based on
cryptographic keys generated using the IPSec mechanism. This enables
access control on a per-machine basis or per-application if the remote
machine is running the same mechanism and trusted to enforce the
access control policy.
Patch design approach:
The patch's main function is to authorize a socket's access to a IPSec
policy based on their security contexts. Since the communication is
implemented by a security association, the patch ensures that the
security association's negotiated and used have the same security
context. The patch enables allocation and deallocation of such
security contexts for policies and security associations. It also
enables copying of the security context when policies are cloned.
Lastly, the patch ensures that packets that are sent without using a
IPSec security assocation with a security context are allowed to be
sent in that manner.
A presentation available at
www.selinux-symposium.org/2005/presentations/session2/2-3-jaeger.pdf
from the SELinux symposium describes the overall approach.
Patch implementation details:
The function which authorizes a socket to perform a requested
operation (send/receive) on a IPSec policy (xfrm_policy) is
selinux_xfrm_policy_lookup. The Netfilter and rcv_skb hooks ensure
that if a IPSec SA with a securit y association has not been used,
then the socket is allowed to send or receive the packet,
respectively.
The patch implements SELinux function for allocating security contexts
when policies (xfrm_policy) are created via the pfkey or xfrm_user
interfaces via selinux_xfrm_policy_alloc. When a security association
is built, SELinux allocates the security context designated by the
XFRM subsystem which is based on that of the authorized policy via
selinux_xfrm_state_alloc.
When a xfrm_policy is cloned, the security context of that policy, if
any, is copied to the clone via selinux_xfrm_policy_clone.
When a xfrm_policy or xfrm_state is freed, its security context, if
any is also freed at selinux_xfrm_policy_free or
selinux_xfrm_state_free.
Testing:
The SELinux authorization function is tested using ipsec-tools. We
created policies and security associations with particular security
contexts and added SELinux access control policy entries to verify the
authorization decision. We also made sure that packets for which no
security context was supplied (which either did or did not use
security associations) were authorized using an unlabelled context.
Signed-off-by: Trent Jaeger <tjaeger@cse.psu.edu>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-12-14 00:12:40 -07:00
|
|
|
/*
|
|
|
|
* LSM hook that controls access to unlabelled packets. If
|
|
|
|
* a xfrm_state is authorizable (defined by macro) then it was
|
|
|
|
* already authorized by the IPSec process. If not, then
|
|
|
|
* we need to check for unlabelled access since this may not have
|
|
|
|
* gone thru the IPSec process.
|
|
|
|
*/
|
|
|
|
int selinux_xfrm_sock_rcv_skb(u32 isec_sid, struct sk_buff *skb)
|
|
|
|
{
|
|
|
|
int i, rc = 0;
|
|
|
|
struct sec_path *sp;
|
|
|
|
|
|
|
|
sp = skb->sp;
|
|
|
|
|
|
|
|
if (sp) {
|
|
|
|
/*
|
|
|
|
* __xfrm_policy_check does not approve unless xfrm_policy_ok
|
|
|
|
* says that spi's match for policy and the socket.
|
|
|
|
*
|
|
|
|
* Only need to verify the existence of an authorizable sp.
|
|
|
|
*/
|
|
|
|
for (i = 0; i < sp->len; i++) {
|
|
|
|
struct xfrm_state *x = sp->x[i].xvec;
|
|
|
|
|
|
|
|
if (x && selinux_authorizable_xfrm(x))
|
|
|
|
goto accept;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* check SELinux sock for unlabelled access */
|
|
|
|
rc = avc_has_perm(isec_sid, SECINITSID_UNLABELED, SECCLASS_ASSOCIATION,
|
|
|
|
ASSOCIATION__RECVFROM, NULL);
|
|
|
|
if (rc)
|
|
|
|
goto drop;
|
|
|
|
|
|
|
|
accept:
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
drop:
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* POSTROUTE_LAST hook's XFRM processing:
|
|
|
|
* If we have no security association, then we need to determine
|
|
|
|
* whether the socket is allowed to send to an unlabelled destination.
|
|
|
|
* If we do have a authorizable security association, then it has already been
|
|
|
|
* checked in xfrm_policy_lookup hook.
|
|
|
|
*/
|
|
|
|
int selinux_xfrm_postroute_last(u32 isec_sid, struct sk_buff *skb)
|
|
|
|
{
|
|
|
|
struct dst_entry *dst;
|
|
|
|
int rc = 0;
|
|
|
|
|
|
|
|
dst = skb->dst;
|
|
|
|
|
|
|
|
if (dst) {
|
|
|
|
struct dst_entry *dst_test;
|
|
|
|
|
|
|
|
for (dst_test = dst; dst_test != 0;
|
|
|
|
dst_test = dst_test->child) {
|
|
|
|
struct xfrm_state *x = dst_test->xfrm;
|
|
|
|
|
|
|
|
if (x && selinux_authorizable_xfrm(x))
|
|
|
|
goto accept;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
rc = avc_has_perm(isec_sid, SECINITSID_UNLABELED, SECCLASS_ASSOCIATION,
|
|
|
|
ASSOCIATION__SENDTO, NULL);
|
|
|
|
if (rc)
|
|
|
|
goto drop;
|
|
|
|
|
|
|
|
accept:
|
|
|
|
return NF_ACCEPT;
|
|
|
|
|
|
|
|
drop:
|
|
|
|
return NF_DROP;
|
|
|
|
}
|