mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-24 09:50:04 +00:00
b754026bd9
Since kernfs supports the security xattr handlers, we can simply use these to determine the inode's context, dropping the need to update it from kernfs explicitly using a security_inode_notifysecctx() call. We achieve this by setting a new sbsec flag SE_SBGENFS_XATTR to all mounts that are known to use kernfs under the hood and then fetching the xattrs after determining the fallback genfs sid in inode_doinit_with_dentry() when this flag is set. This will allow implementing full security xattr support in kernfs and removing the ...notifysecctx() call in a subsequent patch. Signed-off-by: Ondrej Mosnacek <omosnace@redhat.com> Acked-by: Stephen Smalley <sds@tycho.nsa.gov> Acked-by: Casey Schaufler <casey@schaufler-ca.com> [PM: more manual merge fixups] Signed-off-by: Paul Moore <paul@paul-moore.com>
398 lines
12 KiB
C
398 lines
12 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* Security server interface.
|
|
*
|
|
* Author : Stephen Smalley, <sds@tycho.nsa.gov>
|
|
*
|
|
*/
|
|
|
|
#ifndef _SELINUX_SECURITY_H_
|
|
#define _SELINUX_SECURITY_H_
|
|
|
|
#include <linux/compiler.h>
|
|
#include <linux/dcache.h>
|
|
#include <linux/magic.h>
|
|
#include <linux/types.h>
|
|
#include <linux/refcount.h>
|
|
#include <linux/workqueue.h>
|
|
#include "flask.h"
|
|
|
|
#define SECSID_NULL 0x00000000 /* unspecified SID */
|
|
#define SECSID_WILD 0xffffffff /* wildcard SID */
|
|
#define SECCLASS_NULL 0x0000 /* no class */
|
|
|
|
/* Identify specific policy version changes */
|
|
#define POLICYDB_VERSION_BASE 15
|
|
#define POLICYDB_VERSION_BOOL 16
|
|
#define POLICYDB_VERSION_IPV6 17
|
|
#define POLICYDB_VERSION_NLCLASS 18
|
|
#define POLICYDB_VERSION_VALIDATETRANS 19
|
|
#define POLICYDB_VERSION_MLS 19
|
|
#define POLICYDB_VERSION_AVTAB 20
|
|
#define POLICYDB_VERSION_RANGETRANS 21
|
|
#define POLICYDB_VERSION_POLCAP 22
|
|
#define POLICYDB_VERSION_PERMISSIVE 23
|
|
#define POLICYDB_VERSION_BOUNDARY 24
|
|
#define POLICYDB_VERSION_FILENAME_TRANS 25
|
|
#define POLICYDB_VERSION_ROLETRANS 26
|
|
#define POLICYDB_VERSION_NEW_OBJECT_DEFAULTS 27
|
|
#define POLICYDB_VERSION_DEFAULT_TYPE 28
|
|
#define POLICYDB_VERSION_CONSTRAINT_NAMES 29
|
|
#define POLICYDB_VERSION_XPERMS_IOCTL 30
|
|
#define POLICYDB_VERSION_INFINIBAND 31
|
|
|
|
/* Range of policy versions we understand*/
|
|
#define POLICYDB_VERSION_MIN POLICYDB_VERSION_BASE
|
|
#define POLICYDB_VERSION_MAX POLICYDB_VERSION_INFINIBAND
|
|
|
|
/* Mask for just the mount related flags */
|
|
#define SE_MNTMASK 0x0f
|
|
/* Super block security struct flags for mount options */
|
|
/* BE CAREFUL, these need to be the low order bits for selinux_get_mnt_opts */
|
|
#define CONTEXT_MNT 0x01
|
|
#define FSCONTEXT_MNT 0x02
|
|
#define ROOTCONTEXT_MNT 0x04
|
|
#define DEFCONTEXT_MNT 0x08
|
|
#define SBLABEL_MNT 0x10
|
|
/* Non-mount related flags */
|
|
#define SE_SBINITIALIZED 0x0100
|
|
#define SE_SBPROC 0x0200
|
|
#define SE_SBGENFS 0x0400
|
|
#define SE_SBGENFS_XATTR 0x0800
|
|
|
|
#define CONTEXT_STR "context"
|
|
#define FSCONTEXT_STR "fscontext"
|
|
#define ROOTCONTEXT_STR "rootcontext"
|
|
#define DEFCONTEXT_STR "defcontext"
|
|
#define SECLABEL_STR "seclabel"
|
|
|
|
struct netlbl_lsm_secattr;
|
|
|
|
extern int selinux_enabled;
|
|
|
|
/* Policy capabilities */
|
|
enum {
|
|
POLICYDB_CAPABILITY_NETPEER,
|
|
POLICYDB_CAPABILITY_OPENPERM,
|
|
POLICYDB_CAPABILITY_EXTSOCKCLASS,
|
|
POLICYDB_CAPABILITY_ALWAYSNETWORK,
|
|
POLICYDB_CAPABILITY_CGROUPSECLABEL,
|
|
POLICYDB_CAPABILITY_NNP_NOSUID_TRANSITION,
|
|
__POLICYDB_CAPABILITY_MAX
|
|
};
|
|
#define POLICYDB_CAPABILITY_MAX (__POLICYDB_CAPABILITY_MAX - 1)
|
|
|
|
extern const char *selinux_policycap_names[__POLICYDB_CAPABILITY_MAX];
|
|
|
|
/*
|
|
* type_datum properties
|
|
* available at the kernel policy version >= POLICYDB_VERSION_BOUNDARY
|
|
*/
|
|
#define TYPEDATUM_PROPERTY_PRIMARY 0x0001
|
|
#define TYPEDATUM_PROPERTY_ATTRIBUTE 0x0002
|
|
|
|
/* limitation of boundary depth */
|
|
#define POLICYDB_BOUNDS_MAXDEPTH 4
|
|
|
|
struct selinux_avc;
|
|
struct selinux_ss;
|
|
|
|
struct selinux_state {
|
|
bool disabled;
|
|
#ifdef CONFIG_SECURITY_SELINUX_DEVELOP
|
|
bool enforcing;
|
|
#endif
|
|
bool checkreqprot;
|
|
bool initialized;
|
|
bool policycap[__POLICYDB_CAPABILITY_MAX];
|
|
struct selinux_avc *avc;
|
|
struct selinux_ss *ss;
|
|
};
|
|
|
|
void selinux_ss_init(struct selinux_ss **ss);
|
|
void selinux_avc_init(struct selinux_avc **avc);
|
|
|
|
extern struct selinux_state selinux_state;
|
|
|
|
#ifdef CONFIG_SECURITY_SELINUX_DEVELOP
|
|
static inline bool enforcing_enabled(struct selinux_state *state)
|
|
{
|
|
return state->enforcing;
|
|
}
|
|
|
|
static inline void enforcing_set(struct selinux_state *state, bool value)
|
|
{
|
|
state->enforcing = value;
|
|
}
|
|
#else
|
|
static inline bool enforcing_enabled(struct selinux_state *state)
|
|
{
|
|
return true;
|
|
}
|
|
|
|
static inline void enforcing_set(struct selinux_state *state, bool value)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
static inline bool selinux_policycap_netpeer(void)
|
|
{
|
|
struct selinux_state *state = &selinux_state;
|
|
|
|
return state->policycap[POLICYDB_CAPABILITY_NETPEER];
|
|
}
|
|
|
|
static inline bool selinux_policycap_openperm(void)
|
|
{
|
|
struct selinux_state *state = &selinux_state;
|
|
|
|
return state->policycap[POLICYDB_CAPABILITY_OPENPERM];
|
|
}
|
|
|
|
static inline bool selinux_policycap_extsockclass(void)
|
|
{
|
|
struct selinux_state *state = &selinux_state;
|
|
|
|
return state->policycap[POLICYDB_CAPABILITY_EXTSOCKCLASS];
|
|
}
|
|
|
|
static inline bool selinux_policycap_alwaysnetwork(void)
|
|
{
|
|
struct selinux_state *state = &selinux_state;
|
|
|
|
return state->policycap[POLICYDB_CAPABILITY_ALWAYSNETWORK];
|
|
}
|
|
|
|
static inline bool selinux_policycap_cgroupseclabel(void)
|
|
{
|
|
struct selinux_state *state = &selinux_state;
|
|
|
|
return state->policycap[POLICYDB_CAPABILITY_CGROUPSECLABEL];
|
|
}
|
|
|
|
static inline bool selinux_policycap_nnp_nosuid_transition(void)
|
|
{
|
|
struct selinux_state *state = &selinux_state;
|
|
|
|
return state->policycap[POLICYDB_CAPABILITY_NNP_NOSUID_TRANSITION];
|
|
}
|
|
|
|
int security_mls_enabled(struct selinux_state *state);
|
|
int security_load_policy(struct selinux_state *state,
|
|
void *data, size_t len);
|
|
int security_read_policy(struct selinux_state *state,
|
|
void **data, size_t *len);
|
|
size_t security_policydb_len(struct selinux_state *state);
|
|
|
|
int security_policycap_supported(struct selinux_state *state,
|
|
unsigned int req_cap);
|
|
|
|
#define SEL_VEC_MAX 32
|
|
struct av_decision {
|
|
u32 allowed;
|
|
u32 auditallow;
|
|
u32 auditdeny;
|
|
u32 seqno;
|
|
u32 flags;
|
|
};
|
|
|
|
#define XPERMS_ALLOWED 1
|
|
#define XPERMS_AUDITALLOW 2
|
|
#define XPERMS_DONTAUDIT 4
|
|
|
|
#define security_xperm_set(perms, x) (perms[x >> 5] |= 1 << (x & 0x1f))
|
|
#define security_xperm_test(perms, x) (1 & (perms[x >> 5] >> (x & 0x1f)))
|
|
struct extended_perms_data {
|
|
u32 p[8];
|
|
};
|
|
|
|
struct extended_perms_decision {
|
|
u8 used;
|
|
u8 driver;
|
|
struct extended_perms_data *allowed;
|
|
struct extended_perms_data *auditallow;
|
|
struct extended_perms_data *dontaudit;
|
|
};
|
|
|
|
struct extended_perms {
|
|
u16 len; /* length associated decision chain */
|
|
struct extended_perms_data drivers; /* flag drivers that are used */
|
|
};
|
|
|
|
/* definitions of av_decision.flags */
|
|
#define AVD_FLAGS_PERMISSIVE 0x0001
|
|
|
|
void security_compute_av(struct selinux_state *state,
|
|
u32 ssid, u32 tsid,
|
|
u16 tclass, struct av_decision *avd,
|
|
struct extended_perms *xperms);
|
|
|
|
void security_compute_xperms_decision(struct selinux_state *state,
|
|
u32 ssid, u32 tsid, u16 tclass,
|
|
u8 driver,
|
|
struct extended_perms_decision *xpermd);
|
|
|
|
void security_compute_av_user(struct selinux_state *state,
|
|
u32 ssid, u32 tsid,
|
|
u16 tclass, struct av_decision *avd);
|
|
|
|
int security_transition_sid(struct selinux_state *state,
|
|
u32 ssid, u32 tsid, u16 tclass,
|
|
const struct qstr *qstr, u32 *out_sid);
|
|
|
|
int security_transition_sid_user(struct selinux_state *state,
|
|
u32 ssid, u32 tsid, u16 tclass,
|
|
const char *objname, u32 *out_sid);
|
|
|
|
int security_member_sid(struct selinux_state *state, u32 ssid, u32 tsid,
|
|
u16 tclass, u32 *out_sid);
|
|
|
|
int security_change_sid(struct selinux_state *state, u32 ssid, u32 tsid,
|
|
u16 tclass, u32 *out_sid);
|
|
|
|
int security_sid_to_context(struct selinux_state *state, u32 sid,
|
|
char **scontext, u32 *scontext_len);
|
|
|
|
int security_sid_to_context_force(struct selinux_state *state,
|
|
u32 sid, char **scontext, u32 *scontext_len);
|
|
|
|
int security_sid_to_context_inval(struct selinux_state *state,
|
|
u32 sid, char **scontext, u32 *scontext_len);
|
|
|
|
int security_context_to_sid(struct selinux_state *state,
|
|
const char *scontext, u32 scontext_len,
|
|
u32 *out_sid, gfp_t gfp);
|
|
|
|
int security_context_str_to_sid(struct selinux_state *state,
|
|
const char *scontext, u32 *out_sid, gfp_t gfp);
|
|
|
|
int security_context_to_sid_default(struct selinux_state *state,
|
|
const char *scontext, u32 scontext_len,
|
|
u32 *out_sid, u32 def_sid, gfp_t gfp_flags);
|
|
|
|
int security_context_to_sid_force(struct selinux_state *state,
|
|
const char *scontext, u32 scontext_len,
|
|
u32 *sid);
|
|
|
|
int security_get_user_sids(struct selinux_state *state,
|
|
u32 callsid, char *username,
|
|
u32 **sids, u32 *nel);
|
|
|
|
int security_port_sid(struct selinux_state *state,
|
|
u8 protocol, u16 port, u32 *out_sid);
|
|
|
|
int security_ib_pkey_sid(struct selinux_state *state,
|
|
u64 subnet_prefix, u16 pkey_num, u32 *out_sid);
|
|
|
|
int security_ib_endport_sid(struct selinux_state *state,
|
|
const char *dev_name, u8 port_num, u32 *out_sid);
|
|
|
|
int security_netif_sid(struct selinux_state *state,
|
|
char *name, u32 *if_sid);
|
|
|
|
int security_node_sid(struct selinux_state *state,
|
|
u16 domain, void *addr, u32 addrlen,
|
|
u32 *out_sid);
|
|
|
|
int security_validate_transition(struct selinux_state *state,
|
|
u32 oldsid, u32 newsid, u32 tasksid,
|
|
u16 tclass);
|
|
|
|
int security_validate_transition_user(struct selinux_state *state,
|
|
u32 oldsid, u32 newsid, u32 tasksid,
|
|
u16 tclass);
|
|
|
|
int security_bounded_transition(struct selinux_state *state,
|
|
u32 oldsid, u32 newsid);
|
|
|
|
int security_sid_mls_copy(struct selinux_state *state,
|
|
u32 sid, u32 mls_sid, u32 *new_sid);
|
|
|
|
int security_net_peersid_resolve(struct selinux_state *state,
|
|
u32 nlbl_sid, u32 nlbl_type,
|
|
u32 xfrm_sid,
|
|
u32 *peer_sid);
|
|
|
|
int security_get_classes(struct selinux_state *state,
|
|
char ***classes, int *nclasses);
|
|
int security_get_permissions(struct selinux_state *state,
|
|
char *class, char ***perms, int *nperms);
|
|
int security_get_reject_unknown(struct selinux_state *state);
|
|
int security_get_allow_unknown(struct selinux_state *state);
|
|
|
|
#define SECURITY_FS_USE_XATTR 1 /* use xattr */
|
|
#define SECURITY_FS_USE_TRANS 2 /* use transition SIDs, e.g. devpts/tmpfs */
|
|
#define SECURITY_FS_USE_TASK 3 /* use task SIDs, e.g. pipefs/sockfs */
|
|
#define SECURITY_FS_USE_GENFS 4 /* use the genfs support */
|
|
#define SECURITY_FS_USE_NONE 5 /* no labeling support */
|
|
#define SECURITY_FS_USE_MNTPOINT 6 /* use mountpoint labeling */
|
|
#define SECURITY_FS_USE_NATIVE 7 /* use native label support */
|
|
#define SECURITY_FS_USE_MAX 7 /* Highest SECURITY_FS_USE_XXX */
|
|
|
|
int security_fs_use(struct selinux_state *state, struct super_block *sb);
|
|
|
|
int security_genfs_sid(struct selinux_state *state,
|
|
const char *fstype, char *name, u16 sclass,
|
|
u32 *sid);
|
|
|
|
#ifdef CONFIG_NETLABEL
|
|
int security_netlbl_secattr_to_sid(struct selinux_state *state,
|
|
struct netlbl_lsm_secattr *secattr,
|
|
u32 *sid);
|
|
|
|
int security_netlbl_sid_to_secattr(struct selinux_state *state,
|
|
u32 sid,
|
|
struct netlbl_lsm_secattr *secattr);
|
|
#else
|
|
static inline int security_netlbl_secattr_to_sid(struct selinux_state *state,
|
|
struct netlbl_lsm_secattr *secattr,
|
|
u32 *sid)
|
|
{
|
|
return -EIDRM;
|
|
}
|
|
|
|
static inline int security_netlbl_sid_to_secattr(struct selinux_state *state,
|
|
u32 sid,
|
|
struct netlbl_lsm_secattr *secattr)
|
|
{
|
|
return -ENOENT;
|
|
}
|
|
#endif /* CONFIG_NETLABEL */
|
|
|
|
const char *security_get_initial_sid_context(u32 sid);
|
|
|
|
/*
|
|
* status notifier using mmap interface
|
|
*/
|
|
extern struct page *selinux_kernel_status_page(struct selinux_state *state);
|
|
|
|
#define SELINUX_KERNEL_STATUS_VERSION 1
|
|
struct selinux_kernel_status {
|
|
u32 version; /* version number of thie structure */
|
|
u32 sequence; /* sequence number of seqlock logic */
|
|
u32 enforcing; /* current setting of enforcing mode */
|
|
u32 policyload; /* times of policy reloaded */
|
|
u32 deny_unknown; /* current setting of deny_unknown */
|
|
/*
|
|
* The version > 0 supports above members.
|
|
*/
|
|
} __packed;
|
|
|
|
extern void selinux_status_update_setenforce(struct selinux_state *state,
|
|
int enforcing);
|
|
extern void selinux_status_update_policyload(struct selinux_state *state,
|
|
int seqno);
|
|
extern void selinux_complete_init(void);
|
|
extern int selinux_disable(struct selinux_state *state);
|
|
extern void exit_sel_fs(void);
|
|
extern struct path selinux_null;
|
|
extern struct vfsmount *selinuxfs_mount;
|
|
extern void selnl_notify_setenforce(int val);
|
|
extern void selnl_notify_policyload(u32 seqno);
|
|
extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm);
|
|
|
|
extern void avtab_cache_init(void);
|
|
extern void ebitmap_cache_init(void);
|
|
extern void hashtab_cache_init(void);
|
|
|
|
#endif /* _SELINUX_SECURITY_H_ */
|