2bf4969032
Convert avc_audit in security/selinux/avc.c to use lsm_audit.h,
for better maintainability.
- changed selinux to use common_audit_data instead of
avc_audit_data
- eliminated code in avc.c and used code from lsm_audit.h instead.
Had to add a LSM_AUDIT_NO_AUDIT to lsm_audit.h so that avc_audit
can call common_lsm_audit and do the pre and post callbacks without
doing the actual dump. This makes it so that the patched version
behaves the same way as the unpatched version.
Also added a denied field to the selinux_audit_data private space,
once again to make it so that the patched version behaves like the
unpatched.
I've tested and confirmed that AVCs look the same before and after
this patch.
Signed-off-by: Thomas Liu <tliu@redhat.com>
Acked-by: Stephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: James Morris <jmorris@namei.org>
117 lines
2.5 KiB
C
117 lines
2.5 KiB
C
/*
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* Common LSM logging functions
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* Heavily borrowed from selinux/avc.h
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*
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* Author : Etienne BASSET <etienne.basset@ensta.org>
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*
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* All credits to : Stephen Smalley, <sds@epoch.ncsc.mil>
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* All BUGS to : Etienne BASSET <etienne.basset@ensta.org>
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*/
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#ifndef _LSM_COMMON_LOGGING_
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#define _LSM_COMMON_LOGGING_
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#include <linux/stddef.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/kdev_t.h>
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#include <linux/spinlock.h>
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#include <linux/init.h>
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#include <linux/audit.h>
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#include <linux/in6.h>
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#include <linux/path.h>
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#include <linux/key.h>
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#include <linux/skbuff.h>
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#include <asm/system.h>
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/* Auxiliary data to use in generating the audit record. */
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struct common_audit_data {
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char type;
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#define LSM_AUDIT_DATA_FS 1
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#define LSM_AUDIT_DATA_NET 2
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#define LSM_AUDIT_DATA_CAP 3
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#define LSM_AUDIT_DATA_IPC 4
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#define LSM_AUDIT_DATA_TASK 5
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#define LSM_AUDIT_DATA_KEY 6
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#define LSM_AUDIT_NO_AUDIT 7
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struct task_struct *tsk;
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union {
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struct {
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struct path path;
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struct inode *inode;
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} fs;
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struct {
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int netif;
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struct sock *sk;
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u16 family;
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__be16 dport;
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__be16 sport;
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union {
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struct {
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__be32 daddr;
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__be32 saddr;
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} v4;
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struct {
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struct in6_addr daddr;
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struct in6_addr saddr;
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} v6;
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} fam;
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} net;
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int cap;
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int ipc_id;
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struct task_struct *tsk;
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#ifdef CONFIG_KEYS
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struct {
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key_serial_t key;
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char *key_desc;
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} key_struct;
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#endif
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} u;
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/* this union contains LSM specific data */
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union {
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#ifdef CONFIG_SECURITY_SMACK
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/* SMACK data */
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struct smack_audit_data {
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const char *function;
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char *subject;
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char *object;
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char *request;
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int result;
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} smack_audit_data;
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#endif
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#ifdef CONFIG_SECURITY_SELINUX
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/* SELinux data */
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struct {
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u32 ssid;
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u32 tsid;
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u16 tclass;
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u32 requested;
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u32 audited;
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u32 denied;
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struct av_decision *avd;
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int result;
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} selinux_audit_data;
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#endif
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};
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/* these callback will be implemented by a specific LSM */
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void (*lsm_pre_audit)(struct audit_buffer *, void *);
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void (*lsm_post_audit)(struct audit_buffer *, void *);
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};
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#define v4info fam.v4
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#define v6info fam.v6
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int ipv4_skb_to_auditdata(struct sk_buff *skb,
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struct common_audit_data *ad, u8 *proto);
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int ipv6_skb_to_auditdata(struct sk_buff *skb,
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struct common_audit_data *ad, u8 *proto);
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/* Initialize an LSM audit data structure. */
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#define COMMON_AUDIT_DATA_INIT(_d, _t) \
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{ memset((_d), 0, sizeof(struct common_audit_data)); \
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(_d)->type = LSM_AUDIT_DATA_##_t; }
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void common_lsm_audit(struct common_audit_data *a);
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#endif
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