security.h

Go to the documentation of this file.

/*
 * Security server interface.
 *
 * Author : Stephen Smalley, <[email protected]>
 *
 */

#ifndef _SELINUX_SECURITY_H_
#define _SELINUX_SECURITY_H_

#include <linux/dcache.h>
#include <linux/magic.h>
#include <linux/types.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

/* Range of policy versions we understand*/
#define POLICYDB_VERSION_MIN   POLICYDB_VERSION_BASE
#ifdef CONFIG_SECURITY_SELINUX_POLICYDB_VERSION_MAX
#define POLICYDB_VERSION_MAX    CONFIG_SECURITY_SELINUX_POLICYDB_VERSION_MAX_VALUE
#else
#define POLICYDB_VERSION_MAX    POLICYDB_VERSION_DEFAULT_TYPE
#endif

/* Mask for just the mount related flags */
#define SE_MNTMASK  0x0f
/* Super block security struct flags for mount options */
#define CONTEXT_MNT 0x01
#define FSCONTEXT_MNT   0x02
#define ROOTCONTEXT_MNT 0x04
#define DEFCONTEXT_MNT  0x08
/* Non-mount related flags */
#define SE_SBINITIALIZED    0x10
#define SE_SBPROC       0x20
#define SE_SBLABELSUPP  0x40

#define CONTEXT_STR "context="
#define FSCONTEXT_STR   "fscontext="
#define ROOTCONTEXT_STR "rootcontext="
#define DEFCONTEXT_STR  "defcontext="
#define LABELSUPP_STR "seclabel"

struct netlbl_lsm_secattr;

extern int selinux_enabled;

/* Policy capabilities */
enum {
    POLICYDB_CAPABILITY_NETPEER,
    POLICYDB_CAPABILITY_OPENPERM,
    __POLICYDB_CAPABILITY_MAX
};
#define POLICYDB_CAPABILITY_MAX (__POLICYDB_CAPABILITY_MAX - 1)

extern int selinux_policycap_netpeer;
extern int selinux_policycap_openperm;

/*
 * 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

int security_mls_enabled(void);

int security_load_policy(void *data, size_t len);
int security_read_policy(void **data, size_t *len);
size_t security_policydb_len(void);

int security_policycap_supported(unsigned int req_cap);

#define SEL_VEC_MAX 32
struct av_decision {
    u32 allowed;
    u32 auditallow;
    u32 auditdeny;
    u32 seqno;
    u32 flags;
};

/* definitions of av_decision.flags */
#define AVD_FLAGS_PERMISSIVE    0x0001

void security_compute_av(u32 ssid, u32 tsid,
             u16 tclass, struct av_decision *avd);

void security_compute_av_user(u32 ssid, u32 tsid,
                 u16 tclass, struct av_decision *avd);

int security_transition_sid(u32 ssid, u32 tsid, u16 tclass,
                const struct qstr *qstr, u32 *out_sid);

int security_transition_sid_user(u32 ssid, u32 tsid, u16 tclass,
                 const char *objname, u32 *out_sid);

int security_member_sid(u32 ssid, u32 tsid,
    u16 tclass, u32 *out_sid);

int security_change_sid(u32 ssid, u32 tsid,
    u16 tclass, u32 *out_sid);

int security_sid_to_context(u32 sid, char **scontext,
    u32 *scontext_len);

int security_sid_to_context_force(u32 sid, char **scontext, u32 *scontext_len);

int security_context_to_sid(const char *scontext, u32 scontext_len,
    u32 *out_sid);

int security_context_to_sid_default(const char *scontext, u32 scontext_len,
                    u32 *out_sid, u32 def_sid, gfp_t gfp_flags);

int security_context_to_sid_force(const char *scontext, u32 scontext_len,
                  u32 *sid);

int security_get_user_sids(u32 callsid, char *username,
               u32 **sids, u32 *nel);

int security_port_sid(u8 protocol, u16 port, u32 *out_sid);

int security_netif_sid(char *name, u32 *if_sid);

int security_node_sid(u16 domain, void *addr, u32 addrlen,
    u32 *out_sid);

int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid,
                 u16 tclass);

int security_bounded_transition(u32 oldsid, u32 newsid);

int security_sid_mls_copy(u32 sid, u32 mls_sid, u32 *new_sid);

int security_net_peersid_resolve(u32 nlbl_sid, u32 nlbl_type,
                 u32 xfrm_sid,
                 u32 *peer_sid);

int security_get_classes(char ***classes, int *nclasses);
int security_get_permissions(char *class, char ***perms, int *nperms);
int security_get_reject_unknown(void);
int security_get_allow_unknown(void);

#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 */

int security_fs_use(const char *fstype, unsigned int *behavior,
    u32 *sid);

int security_genfs_sid(const char *fstype, char *name, u16 sclass,
    u32 *sid);

#ifdef CONFIG_NETLABEL
int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr,
                   u32 *sid);

int security_netlbl_sid_to_secattr(u32 sid,
                   struct netlbl_lsm_secattr *secattr);
#else
static inline int security_netlbl_secattr_to_sid(
                        struct netlbl_lsm_secattr *secattr,
                        u32 *sid)
{
    return -EIDRM;
}

static inline int security_netlbl_sid_to_secattr(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(void);

#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.
     */
} __attribute__((packed));

extern void selinux_status_update_setenforce(int enforcing);
extern void selinux_status_update_policyload(int seqno);
extern void selinux_complete_init(void);
extern int selinux_disable(void);
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);

#endif /* _SELINUX_SECURITY_H_ */