| yuezonghe | 824eb0c | 2024-06-27 02:32:26 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Access vector cache interface for object managers. |
| 3 | * |
| 4 | * Author : Stephen Smalley, <sds@epoch.ncsc.mil> |
| 5 | */ |
| 6 | #ifndef _SELINUX_AVC_H_ |
| 7 | #define _SELINUX_AVC_H_ |
| 8 | |
| 9 | #include <linux/stddef.h> |
| 10 | #include <linux/errno.h> |
| 11 | #include <linux/kernel.h> |
| 12 | #include <linux/kdev_t.h> |
| 13 | #include <linux/spinlock.h> |
| 14 | #include <linux/init.h> |
| 15 | #include <linux/audit.h> |
| 16 | #include <linux/lsm_audit.h> |
| 17 | #include <linux/in6.h> |
| 18 | #include "flask.h" |
| 19 | #include "av_permissions.h" |
| 20 | #include "security.h" |
| 21 | |
| 22 | #ifdef CONFIG_SECURITY_SELINUX_DEVELOP |
| 23 | extern int selinux_enforcing; |
| 24 | #else |
| 25 | #define selinux_enforcing 1 |
| 26 | #endif |
| 27 | |
| 28 | /* |
| 29 | * An entry in the AVC. |
| 30 | */ |
| 31 | struct avc_entry; |
| 32 | |
| 33 | struct task_struct; |
| 34 | struct inode; |
| 35 | struct sock; |
| 36 | struct sk_buff; |
| 37 | |
| 38 | /* |
| 39 | * AVC statistics |
| 40 | */ |
| 41 | struct avc_cache_stats { |
| 42 | unsigned int lookups; |
| 43 | unsigned int misses; |
| 44 | unsigned int allocations; |
| 45 | unsigned int reclaims; |
| 46 | unsigned int frees; |
| 47 | }; |
| 48 | |
| 49 | /* |
| 50 | * We only need this data after we have decided to send an audit message. |
| 51 | */ |
| 52 | struct selinux_late_audit_data { |
| 53 | u32 ssid; |
| 54 | u32 tsid; |
| 55 | u16 tclass; |
| 56 | u32 requested; |
| 57 | u32 audited; |
| 58 | u32 denied; |
| 59 | int result; |
| 60 | }; |
| 61 | |
| 62 | /* |
| 63 | * We collect this at the beginning or during an selinux security operation |
| 64 | */ |
| 65 | struct selinux_audit_data { |
| 66 | /* |
| 67 | * auditdeny is a bit tricky and unintuitive. See the |
| 68 | * comments in avc.c for it's meaning and usage. |
| 69 | */ |
| 70 | u32 auditdeny; |
| 71 | struct selinux_late_audit_data *slad; |
| 72 | }; |
| 73 | |
| 74 | /* |
| 75 | * AVC operations |
| 76 | */ |
| 77 | |
| 78 | void __init avc_init(void); |
| 79 | |
| 80 | int avc_audit(u32 ssid, u32 tsid, |
| 81 | u16 tclass, u32 requested, |
| 82 | struct av_decision *avd, |
| 83 | int result, |
| 84 | struct common_audit_data *a, unsigned flags); |
| 85 | |
| 86 | #define AVC_STRICT 1 /* Ignore permissive mode. */ |
| 87 | int avc_has_perm_noaudit(u32 ssid, u32 tsid, |
| 88 | u16 tclass, u32 requested, |
| 89 | unsigned flags, |
| 90 | struct av_decision *avd); |
| 91 | |
| 92 | int avc_has_perm_flags(u32 ssid, u32 tsid, |
| 93 | u16 tclass, u32 requested, |
| 94 | struct common_audit_data *auditdata, |
| 95 | unsigned); |
| 96 | |
| 97 | static inline int avc_has_perm(u32 ssid, u32 tsid, |
| 98 | u16 tclass, u32 requested, |
| 99 | struct common_audit_data *auditdata) |
| 100 | { |
| 101 | return avc_has_perm_flags(ssid, tsid, tclass, requested, auditdata, 0); |
| 102 | } |
| 103 | |
| 104 | u32 avc_policy_seqno(void); |
| 105 | |
| 106 | #define AVC_CALLBACK_GRANT 1 |
| 107 | #define AVC_CALLBACK_TRY_REVOKE 2 |
| 108 | #define AVC_CALLBACK_REVOKE 4 |
| 109 | #define AVC_CALLBACK_RESET 8 |
| 110 | #define AVC_CALLBACK_AUDITALLOW_ENABLE 16 |
| 111 | #define AVC_CALLBACK_AUDITALLOW_DISABLE 32 |
| 112 | #define AVC_CALLBACK_AUDITDENY_ENABLE 64 |
| 113 | #define AVC_CALLBACK_AUDITDENY_DISABLE 128 |
| 114 | |
| 115 | int avc_add_callback(int (*callback)(u32 event, u32 ssid, u32 tsid, |
| 116 | u16 tclass, u32 perms, |
| 117 | u32 *out_retained), |
| 118 | u32 events, u32 ssid, u32 tsid, |
| 119 | u16 tclass, u32 perms); |
| 120 | |
| 121 | /* Exported to selinuxfs */ |
| 122 | int avc_get_hash_stats(char *page); |
| 123 | extern unsigned int avc_cache_threshold; |
| 124 | |
| 125 | /* Attempt to free avc node cache */ |
| 126 | void avc_disable(void); |
| 127 | |
| 128 | #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS |
| 129 | DECLARE_PER_CPU(struct avc_cache_stats, avc_cache_stats); |
| 130 | #endif |
| 131 | |
| 132 | #endif /* _SELINUX_AVC_H_ */ |
| 133 | |