linux/include
Trent Jaeger df71837d50 [LSM-IPSec]: Security association restriction.
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 XFRM subsystem,
pfkey interface, ipv4/ipv6, and xfrm_user interface to restrict a
socket to use only authorized security associations (or no security
association) to send/receive network packets.

Patch purpose:

The patch is designed to enable access control per packets based on
the strongly authenticated IPSec security association.  Such access
controls augment the existing ones based on network interface and IP
address.  The former are very coarse-grained, and the latter can be
spoofed.  By using IPSec, the system 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 overall approach is that policy (xfrm_policy) entries set by
user-level programs (e.g., setkey for ipsec-tools) are extended with a
security context that is used at policy selection time in the XFRM
subsystem to restrict the sockets that can send/receive packets via
security associations (xfrm_states) that are built from those
policies.

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:

On output, the policy retrieved (via xfrm_policy_lookup or
xfrm_sk_policy_lookup) must be authorized for the security context of
the socket and the same security context is required for resultant
security association (retrieved or negotiated via racoon in
ipsec-tools).  This is enforced in xfrm_state_find.

On input, the policy retrieved must also be authorized for the socket
(at __xfrm_policy_check), and the security context of the policy must
also match the security association being used.

The patch has virtually no impact on packets that do not use IPSec.
The existing Netfilter (outgoing) and LSM rcv_skb hooks are used as
before.

Also, if IPSec is used without security contexts, the impact is
minimal.  The LSM must allow such policies to be selected for the
combination of socket and remote machine, but subsequent IPSec
processing proceeds as in the original case.

Testing:

The pfkey interface is tested using the ipsec-tools.  ipsec-tools have
been modified (a separate ipsec-tools patch is available for version
0.5) that supports assignment of xfrm_policy entries and security
associations with security contexts via setkey and the negotiation
using the security contexts via racoon.

The xfrm_user interface is tested via ad hoc programs that set
security contexts.  These programs are also available from me, and
contain programs for setting, getting, and deleting policy for testing
this interface.  Testing of sa functions was done by tracing kernel
behavior.

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>
2006-01-03 13:10:24 -08:00
..
acpi [ACPI] increase owner_id limit to 64 from 32 2005-12-21 04:52:16 -05:00
asm-alpha [PATCH] mm: fill arch atomic64 gaps 2005-11-23 16:08:39 -08:00
asm-arm [ARM] 3205/1: Handle new EABI relocations when loading kernel modules. 2005-12-14 22:04:22 +00:00
asm-arm26 [PATCH] atomic: inc_not_zero 2005-11-13 18:14:16 -08:00
asm-cris [PATCH] atomic: inc_not_zero 2005-11-13 18:14:16 -08:00
asm-frv [PATCH] FRV: Make the FRV arch work again 2005-11-28 14:42:23 -08:00
asm-generic Merge x86-64 update from Andi 2005-11-14 19:56:02 -08:00
asm-h8300 [PATCH] atomic: inc_not_zero 2005-11-13 18:14:16 -08:00
asm-i386 [PATCH] Avoid namespace pollution in <asm/param.h> 2006-01-02 08:38:38 -08:00
asm-ia64 [PATCH] x86_64/ia64 : Fix compilation error for node_to_first_cpu 2005-12-24 12:30:22 -08:00
asm-m32r [PATCH] m32r: M3A-2170(Mappi-III) IDE support 2005-11-28 14:42:24 -08:00
asm-m68k [PATCH] atomic: inc_not_zero 2005-11-13 18:14:16 -08:00
asm-m68knommu [PATCH] atomic: inc_not_zero 2005-11-13 18:14:16 -08:00
asm-mips [PATCH] ide: AU1200 IDE update 2005-12-15 02:17:46 +01:00
asm-parisc [PARISC] Always spinlock tlb flush operations to ensure preempt safety 2005-11-17 16:44:14 -05:00
asm-powerpc [PATCH] powerpc: Add missing icache flushes for hugepages 2005-12-09 16:30:48 +11:00
asm-ppc [PATCH] ppc: ppc4xx_dma DMA_MODE_{READ,WRITE} fix 2005-12-16 14:43:05 -08:00
asm-s390 [PATCH] atomic: inc_not_zero 2005-11-13 18:14:16 -08:00
asm-sh [PATCH] atomic: inc_not_zero 2005-11-13 18:14:16 -08:00
asm-sh64 [PATCH] atomic: inc_not_zero 2005-11-13 18:14:16 -08:00
asm-sparc [PATCH] sun4c_memerr_reg __iomem annotations 2005-12-15 10:01:29 -08:00
asm-sparc64 [PATCH] sparc: convert IO remapping to VM_PFNMAP 2005-11-28 14:35:36 -08:00
asm-um [PATCH] uml: eliminate anonymous union and clean up symlink lossage 2005-11-22 09:13:41 -08:00
asm-v850 [PATCH] v850: use generic hardirq code 2005-11-15 08:59:20 -08:00
asm-x86_64 [PATCH] Avoid namespace pollution in <asm/param.h> 2006-01-02 08:38:38 -08:00
asm-xtensa [PATCH] atomic: inc_not_zero 2005-11-13 18:14:16 -08:00
keys
linux [LSM-IPSec]: Security association restriction. 2006-01-03 13:10:24 -08:00
math-emu
media [PATCH] V4L/DVB: (3086c) Whitespaces cleanups part 4 2005-12-12 08:57:44 -08:00
mtd [MTD] user-abi: Clean up trailing white spaces 2005-11-07 14:43:11 +01:00
net [LSM-IPSec]: Security association restriction. 2006-01-03 13:10:24 -08:00
pcmcia
rdma [IB] uverbs: have kernel return QP capabilities 2005-11-10 10:22:50 -08:00
rxrpc
scsi [SCSI] fix for fc transport recursion problem. 2005-12-15 19:22:14 -08:00
sound [ALSA] version 1.0.10rc3 2005-11-07 14:35:14 +01:00
video