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Diffstat (limited to 'security/selinux/include/security.h')
| -rw-r--r-- | security/selinux/include/security.h | 394 |
1 files changed, 394 insertions, 0 deletions
diff --git a/security/selinux/include/security.h b/security/selinux/include/security.h new file mode 100644 index 000000000..23e762d52 --- /dev/null +++ b/security/selinux/include/security.h @@ -0,0 +1,394 @@ +/* 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 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_EXTSOCKCLASS, + POLICYDB_CAPABILITY_ALWAYSNETWORK, + POLICYDB_CAPABILITY_CGROUPSECLABEL, + POLICYDB_CAPABILITY_NNP_NOSUID_TRANSITION, + __POLICYDB_CAPABILITY_MAX +}; +#define POLICYDB_CAPABILITY_MAX (__POLICYDB_CAPABILITY_MAX - 1) + +extern 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_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_ */ |