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df71837d50
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>
314 lines
6.2 KiB
C
314 lines
6.2 KiB
C
#ifndef _LINUX_XFRM_H
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#define _LINUX_XFRM_H
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#include <linux/types.h>
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/* All of the structures in this file may not change size as they are
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* passed into the kernel from userspace via netlink sockets.
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*/
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/* Structure to encapsulate addresses. I do not want to use
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* "standard" structure. My apologies.
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*/
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typedef union
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{
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__u32 a4;
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__u32 a6[4];
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} xfrm_address_t;
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/* Ident of a specific xfrm_state. It is used on input to lookup
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* the state by (spi,daddr,ah/esp) or to store information about
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* spi, protocol and tunnel address on output.
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*/
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struct xfrm_id
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{
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xfrm_address_t daddr;
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__u32 spi;
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__u8 proto;
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};
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struct xfrm_sec_ctx {
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__u8 ctx_doi;
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__u8 ctx_alg;
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__u16 ctx_len;
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__u32 ctx_sid;
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char ctx_str[0];
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};
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/* Security Context Domains of Interpretation */
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#define XFRM_SC_DOI_RESERVED 0
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#define XFRM_SC_DOI_LSM 1
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/* Security Context Algorithms */
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#define XFRM_SC_ALG_RESERVED 0
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#define XFRM_SC_ALG_SELINUX 1
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/* Selector, used as selector both on policy rules (SPD) and SAs. */
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struct xfrm_selector
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{
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xfrm_address_t daddr;
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xfrm_address_t saddr;
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__u16 dport;
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__u16 dport_mask;
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__u16 sport;
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__u16 sport_mask;
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__u16 family;
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__u8 prefixlen_d;
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__u8 prefixlen_s;
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__u8 proto;
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int ifindex;
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uid_t user;
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};
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#define XFRM_INF (~(__u64)0)
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struct xfrm_lifetime_cfg
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{
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__u64 soft_byte_limit;
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__u64 hard_byte_limit;
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__u64 soft_packet_limit;
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__u64 hard_packet_limit;
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__u64 soft_add_expires_seconds;
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__u64 hard_add_expires_seconds;
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__u64 soft_use_expires_seconds;
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__u64 hard_use_expires_seconds;
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};
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struct xfrm_lifetime_cur
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{
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__u64 bytes;
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__u64 packets;
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__u64 add_time;
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__u64 use_time;
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};
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struct xfrm_replay_state
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{
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__u32 oseq;
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__u32 seq;
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__u32 bitmap;
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};
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struct xfrm_algo {
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char alg_name[64];
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int alg_key_len; /* in bits */
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char alg_key[0];
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};
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struct xfrm_stats {
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__u32 replay_window;
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__u32 replay;
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__u32 integrity_failed;
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};
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enum
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{
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XFRM_POLICY_IN = 0,
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XFRM_POLICY_OUT = 1,
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XFRM_POLICY_FWD = 2,
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XFRM_POLICY_MAX = 3
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};
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enum
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{
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XFRM_SHARE_ANY, /* No limitations */
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XFRM_SHARE_SESSION, /* For this session only */
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XFRM_SHARE_USER, /* For this user only */
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XFRM_SHARE_UNIQUE /* Use once */
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};
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/* Netlink configuration messages. */
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enum {
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XFRM_MSG_BASE = 0x10,
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XFRM_MSG_NEWSA = 0x10,
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#define XFRM_MSG_NEWSA XFRM_MSG_NEWSA
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XFRM_MSG_DELSA,
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#define XFRM_MSG_DELSA XFRM_MSG_DELSA
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XFRM_MSG_GETSA,
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#define XFRM_MSG_GETSA XFRM_MSG_GETSA
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XFRM_MSG_NEWPOLICY,
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#define XFRM_MSG_NEWPOLICY XFRM_MSG_NEWPOLICY
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XFRM_MSG_DELPOLICY,
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#define XFRM_MSG_DELPOLICY XFRM_MSG_DELPOLICY
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XFRM_MSG_GETPOLICY,
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#define XFRM_MSG_GETPOLICY XFRM_MSG_GETPOLICY
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XFRM_MSG_ALLOCSPI,
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#define XFRM_MSG_ALLOCSPI XFRM_MSG_ALLOCSPI
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XFRM_MSG_ACQUIRE,
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#define XFRM_MSG_ACQUIRE XFRM_MSG_ACQUIRE
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XFRM_MSG_EXPIRE,
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#define XFRM_MSG_EXPIRE XFRM_MSG_EXPIRE
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XFRM_MSG_UPDPOLICY,
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#define XFRM_MSG_UPDPOLICY XFRM_MSG_UPDPOLICY
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XFRM_MSG_UPDSA,
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#define XFRM_MSG_UPDSA XFRM_MSG_UPDSA
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XFRM_MSG_POLEXPIRE,
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#define XFRM_MSG_POLEXPIRE XFRM_MSG_POLEXPIRE
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XFRM_MSG_FLUSHSA,
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#define XFRM_MSG_FLUSHSA XFRM_MSG_FLUSHSA
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XFRM_MSG_FLUSHPOLICY,
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#define XFRM_MSG_FLUSHPOLICY XFRM_MSG_FLUSHPOLICY
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__XFRM_MSG_MAX
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};
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#define XFRM_MSG_MAX (__XFRM_MSG_MAX - 1)
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#define XFRM_NR_MSGTYPES (XFRM_MSG_MAX + 1 - XFRM_MSG_BASE)
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/*
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* Generic LSM security context for comunicating to user space
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* NOTE: Same format as sadb_x_sec_ctx
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*/
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struct xfrm_user_sec_ctx {
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__u16 len;
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__u16 exttype;
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__u8 ctx_alg; /* LSMs: e.g., selinux == 1 */
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__u8 ctx_doi;
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__u16 ctx_len;
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};
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struct xfrm_user_tmpl {
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struct xfrm_id id;
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__u16 family;
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xfrm_address_t saddr;
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__u32 reqid;
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__u8 mode;
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__u8 share;
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__u8 optional;
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__u32 aalgos;
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__u32 ealgos;
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__u32 calgos;
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};
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struct xfrm_encap_tmpl {
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__u16 encap_type;
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__u16 encap_sport;
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__u16 encap_dport;
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xfrm_address_t encap_oa;
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};
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/* Netlink message attributes. */
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enum xfrm_attr_type_t {
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XFRMA_UNSPEC,
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XFRMA_ALG_AUTH, /* struct xfrm_algo */
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XFRMA_ALG_CRYPT, /* struct xfrm_algo */
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XFRMA_ALG_COMP, /* struct xfrm_algo */
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XFRMA_ENCAP, /* struct xfrm_algo + struct xfrm_encap_tmpl */
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XFRMA_TMPL, /* 1 or more struct xfrm_user_tmpl */
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XFRMA_SA,
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XFRMA_POLICY,
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XFRMA_SEC_CTX, /* struct xfrm_sec_ctx */
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__XFRMA_MAX
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#define XFRMA_MAX (__XFRMA_MAX - 1)
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};
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struct xfrm_usersa_info {
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struct xfrm_selector sel;
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struct xfrm_id id;
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xfrm_address_t saddr;
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struct xfrm_lifetime_cfg lft;
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struct xfrm_lifetime_cur curlft;
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struct xfrm_stats stats;
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__u32 seq;
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__u32 reqid;
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__u16 family;
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__u8 mode; /* 0=transport,1=tunnel */
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__u8 replay_window;
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__u8 flags;
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#define XFRM_STATE_NOECN 1
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#define XFRM_STATE_DECAP_DSCP 2
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#define XFRM_STATE_NOPMTUDISC 4
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};
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struct xfrm_usersa_id {
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xfrm_address_t daddr;
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__u32 spi;
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__u16 family;
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__u8 proto;
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};
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struct xfrm_userspi_info {
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struct xfrm_usersa_info info;
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__u32 min;
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__u32 max;
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};
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struct xfrm_userpolicy_info {
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struct xfrm_selector sel;
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struct xfrm_lifetime_cfg lft;
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struct xfrm_lifetime_cur curlft;
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__u32 priority;
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__u32 index;
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__u8 dir;
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__u8 action;
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#define XFRM_POLICY_ALLOW 0
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#define XFRM_POLICY_BLOCK 1
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__u8 flags;
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#define XFRM_POLICY_LOCALOK 1 /* Allow user to override global policy */
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__u8 share;
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};
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struct xfrm_userpolicy_id {
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struct xfrm_selector sel;
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__u32 index;
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__u8 dir;
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};
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struct xfrm_user_acquire {
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struct xfrm_id id;
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xfrm_address_t saddr;
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struct xfrm_selector sel;
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struct xfrm_userpolicy_info policy;
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__u32 aalgos;
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__u32 ealgos;
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__u32 calgos;
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__u32 seq;
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};
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struct xfrm_user_expire {
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struct xfrm_usersa_info state;
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__u8 hard;
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};
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struct xfrm_user_polexpire {
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struct xfrm_userpolicy_info pol;
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__u8 hard;
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};
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struct xfrm_usersa_flush {
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__u8 proto;
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};
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#ifndef __KERNEL__
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/* backwards compatibility for userspace */
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#define XFRMGRP_ACQUIRE 1
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#define XFRMGRP_EXPIRE 2
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#define XFRMGRP_SA 4
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#define XFRMGRP_POLICY 8
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#endif
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enum xfrm_nlgroups {
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XFRMNLGRP_NONE,
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#define XFRMNLGRP_NONE XFRMNLGRP_NONE
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XFRMNLGRP_ACQUIRE,
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#define XFRMNLGRP_ACQUIRE XFRMNLGRP_ACQUIRE
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XFRMNLGRP_EXPIRE,
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#define XFRMNLGRP_EXPIRE XFRMNLGRP_EXPIRE
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XFRMNLGRP_SA,
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#define XFRMNLGRP_SA XFRMNLGRP_SA
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XFRMNLGRP_POLICY,
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#define XFRMNLGRP_POLICY XFRMNLGRP_POLICY
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__XFRMNLGRP_MAX
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};
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#define XFRMNLGRP_MAX (__XFRMNLGRP_MAX - 1)
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#endif /* _LINUX_XFRM_H */
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