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Diffstat (limited to 'security/selinux/include/security.h')
| -rw-r--r-- | security/selinux/include/security.h | 385 |
1 files changed, 385 insertions, 0 deletions
diff --git a/security/selinux/include/security.h b/security/selinux/include/security.h new file mode 100644 index 0000000000..a9de89af8f --- /dev/null +++ b/security/selinux/include/security.h @@ -0,0 +1,385 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Security server interface. + * + * Author : Stephen Smalley, <stephen.smalley.work@gmail.com> + * + */ + +#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/rcupdate.h> +#include <linux/refcount.h> +#include <linux/workqueue.h> +#include <linux/delay.h> +#include <linux/printk.h> +#include "flask.h" +#include "policycap.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 +#define POLICYDB_VERSION_GLBLUB 32 +#define POLICYDB_VERSION_COMP_FTRANS 33 /* compressed filename transitions */ + +/* Range of policy versions we understand*/ +#define POLICYDB_VERSION_MIN POLICYDB_VERSION_BASE +#define POLICYDB_VERSION_MAX POLICYDB_VERSION_COMP_FTRANS + +/* 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 SE_SBNATIVE 0x1000 + +#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_boot; + +/* + * 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_policy; + +struct selinux_state { +#ifdef CONFIG_SECURITY_SELINUX_DEVELOP + bool enforcing; +#endif + bool initialized; + bool policycap[__POLICYDB_CAP_MAX]; + + struct page *status_page; + struct mutex status_lock; + + struct selinux_policy __rcu *policy; + struct mutex policy_mutex; +} __randomize_layout; + +void selinux_avc_init(void); + +extern struct selinux_state selinux_state; + +static inline bool selinux_initialized(void) +{ + /* do a synchronized load to avoid race conditions */ + return smp_load_acquire(&selinux_state.initialized); +} + +static inline void selinux_mark_initialized(void) +{ + /* do a synchronized write to avoid race conditions */ + smp_store_release(&selinux_state.initialized, true); +} + +#ifdef CONFIG_SECURITY_SELINUX_DEVELOP +static inline bool enforcing_enabled(void) +{ + return READ_ONCE(selinux_state.enforcing); +} + +static inline void enforcing_set(bool value) +{ + WRITE_ONCE(selinux_state.enforcing, value); +} +#else +static inline bool enforcing_enabled(void) +{ + return true; +} + +static inline void enforcing_set(bool value) +{ +} +#endif + +static inline bool checkreqprot_get(void) +{ + /* non-zero/true checkreqprot values are no longer supported */ + return 0; +} + +static inline bool selinux_policycap_netpeer(void) +{ + return READ_ONCE(selinux_state.policycap[POLICYDB_CAP_NETPEER]); +} + +static inline bool selinux_policycap_openperm(void) +{ + return READ_ONCE(selinux_state.policycap[POLICYDB_CAP_OPENPERM]); +} + +static inline bool selinux_policycap_extsockclass(void) +{ + return READ_ONCE(selinux_state.policycap[POLICYDB_CAP_EXTSOCKCLASS]); +} + +static inline bool selinux_policycap_alwaysnetwork(void) +{ + return READ_ONCE(selinux_state.policycap[POLICYDB_CAP_ALWAYSNETWORK]); +} + +static inline bool selinux_policycap_cgroupseclabel(void) +{ + return READ_ONCE(selinux_state.policycap[POLICYDB_CAP_CGROUPSECLABEL]); +} + +static inline bool selinux_policycap_nnp_nosuid_transition(void) +{ + return READ_ONCE( + selinux_state.policycap[POLICYDB_CAP_NNP_NOSUID_TRANSITION]); +} + +static inline bool selinux_policycap_genfs_seclabel_symlinks(void) +{ + return READ_ONCE( + selinux_state.policycap[POLICYDB_CAP_GENFS_SECLABEL_SYMLINKS]); +} + +static inline bool selinux_policycap_ioctl_skip_cloexec(void) +{ + return READ_ONCE( + selinux_state.policycap[POLICYDB_CAP_IOCTL_SKIP_CLOEXEC]); +} + +struct selinux_policy_convert_data; + +struct selinux_load_state { + struct selinux_policy *policy; + struct selinux_policy_convert_data *convert_data; +}; + +int security_mls_enabled(void); +int security_load_policy(void *data, size_t len, + struct selinux_load_state *load_state); +void selinux_policy_commit(struct selinux_load_state *load_state); +void selinux_policy_cancel(struct selinux_load_state *load_state); +int security_read_policy(void **data, size_t *len); +int security_read_state_kernel(void **data, size_t *len); +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; +}; + +#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(u32 ssid, u32 tsid, + u16 tclass, struct av_decision *avd, + struct extended_perms *xperms); + +void security_compute_xperms_decision(u32 ssid, u32 tsid, u16 tclass, + u8 driver, + struct extended_perms_decision *xpermd); + +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_sid_to_context_inval(u32 sid, char **scontext, u32 *scontext_len); + +int security_context_to_sid(const char *scontext, u32 scontext_len, + u32 *out_sid, gfp_t gfp); + +int security_context_str_to_sid(const char *scontext, u32 *out_sid, gfp_t gfp); + +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_ib_pkey_sid(u64 subnet_prefix, u16 pkey_num, u32 *out_sid); + +int security_ib_endport_sid(const char *dev_name, u8 port_num, 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_validate_transition_user(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(struct selinux_policy *policy, + char ***classes, u32 *nclasses); +int security_get_permissions(struct selinux_policy *policy, + const char *class, char ***perms, u32 *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 */ +#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 super_block *sb); + +int security_genfs_sid(const char *fstype, const char *path, u16 sclass, + u32 *sid); + +int selinux_policy_genfs_sid(struct selinux_policy *policy, + const char *fstype, const char *path, 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 the 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(bool enforcing); +extern void selinux_status_update_policyload(u32 seqno); +extern void selinux_complete_init(void); +extern struct path selinux_null; +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); +extern int security_sidtab_hash_stats(char *page); + +#endif /* _SELINUX_SECURITY_H_ */ |