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59438b4647
Implement a SELinux hook for lockdown. If the lockdown module is also
enabled, then a denial by the lockdown module will take precedence over
SELinux, so SELinux can only further restrict lockdown decisions.
The SELinux hook only distinguishes at the granularity of integrity
versus confidentiality similar to the lockdown module, but includes the
full lockdown reason as part of the audit record as a hint in diagnosing
what triggered the denial. To support this auditing, move the
lockdown_reasons[] string array from being private to the lockdown
module to the security framework so that it can be used by the lsm audit
code and so that it is always available even when the lockdown module
is disabled.
Note that the SELinux implementation allows the integrity and
confidentiality reasons to be controlled independently from one another.
Thus, in an SELinux policy, one could allow operations that specify
an integrity reason while blocking operations that specify a
confidentiality reason. The SELinux hook implementation is
stricter than the lockdown module in validating the provided reason value.
Sample AVC audit output from denials:
avc: denied { integrity } for pid=3402 comm="fwupd"
lockdown_reason="/dev/mem,kmem,port" scontext=system_u:system_r:fwupd_t:s0
tcontext=system_u:system_r:fwupd_t:s0 tclass=lockdown permissive=0
avc: denied { confidentiality } for pid=4628 comm="cp"
lockdown_reason="/proc/kcore access"
scontext=unconfined_u:unconfined_r:test_lockdown_integrity_t:s0-s0:c0.c1023
tcontext=unconfined_u:unconfined_r:test_lockdown_integrity_t:s0-s0:c0.c1023
tclass=lockdown permissive=0
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
Reviewed-by: James Morris <jamorris@linux.microsoft.com>
[PM: some merge fuzz do the the perf hooks]
Signed-off-by: Paul Moore <paul@paul-moore.com>
127 lines
2.8 KiB
C
127 lines
2.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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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@tycho.nsa.gov>
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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 <rdma/ib_verbs.h>
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struct lsm_network_audit {
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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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};
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struct lsm_ioctlop_audit {
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struct path path;
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u16 cmd;
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};
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struct lsm_ibpkey_audit {
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u64 subnet_prefix;
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u16 pkey;
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};
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struct lsm_ibendport_audit {
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char dev_name[IB_DEVICE_NAME_MAX];
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u8 port;
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};
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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_PATH 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_DATA_NONE 7
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#define LSM_AUDIT_DATA_KMOD 8
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#define LSM_AUDIT_DATA_INODE 9
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#define LSM_AUDIT_DATA_DENTRY 10
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#define LSM_AUDIT_DATA_IOCTL_OP 11
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#define LSM_AUDIT_DATA_FILE 12
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#define LSM_AUDIT_DATA_IBPKEY 13
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#define LSM_AUDIT_DATA_IBENDPORT 14
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#define LSM_AUDIT_DATA_LOCKDOWN 15
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union {
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struct path path;
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struct dentry *dentry;
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struct inode *inode;
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struct lsm_network_audit *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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char *kmod_name;
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struct lsm_ioctlop_audit *op;
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struct file *file;
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struct lsm_ibpkey_audit *ibpkey;
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struct lsm_ibendport_audit *ibendport;
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int reason;
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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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struct smack_audit_data *smack_audit_data;
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#endif
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#ifdef CONFIG_SECURITY_SELINUX
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struct selinux_audit_data *selinux_audit_data;
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#endif
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#ifdef CONFIG_SECURITY_APPARMOR
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struct apparmor_audit_data *apparmor_audit_data;
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#endif
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}; /* per LSM data pointer union */
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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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void common_lsm_audit(struct common_audit_data *a,
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void (*pre_audit)(struct audit_buffer *, void *),
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void (*post_audit)(struct audit_buffer *, void *));
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#endif
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