| 1 | /* SPDX-License-Identifier: GPL-2.0 */ | 
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| 2 | /* | 
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| 3 | * Security server interface. | 
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| 4 | * | 
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| 5 | * Author : Stephen Smalley, <stephen.smalley.work@gmail.com> | 
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| 6 | * | 
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| 7 | */ | 
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| 8 |  | 
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| 9 | #ifndef _SELINUX_SECURITY_H_ | 
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| 10 | #define _SELINUX_SECURITY_H_ | 
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| 11 |  | 
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| 12 | #include <linux/compiler.h> | 
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| 13 | #include <linux/dcache.h> | 
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| 14 | #include <linux/magic.h> | 
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| 15 | #include <linux/types.h> | 
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| 16 | #include <linux/rcupdate.h> | 
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| 17 | #include <linux/refcount.h> | 
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| 18 | #include <linux/workqueue.h> | 
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| 19 | #include <linux/delay.h> | 
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| 20 | #include <linux/printk.h> | 
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| 21 | #include "flask.h" | 
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| 22 | #include "policycap.h" | 
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| 23 |  | 
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| 24 | #define SECSID_NULL   0x00000000 /* unspecified SID */ | 
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| 25 | #define SECSID_WILD   0xffffffff /* wildcard SID */ | 
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| 26 | #define SECCLASS_NULL 0x0000 /* no class */ | 
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| 27 |  | 
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| 28 | /* Identify specific policy version changes */ | 
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| 29 | #define POLICYDB_VERSION_BASE		     15 | 
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| 30 | #define POLICYDB_VERSION_BOOL		     16 | 
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| 31 | #define POLICYDB_VERSION_IPV6		     17 | 
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| 32 | #define POLICYDB_VERSION_NLCLASS	     18 | 
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| 33 | #define POLICYDB_VERSION_VALIDATETRANS	     19 | 
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| 34 | #define POLICYDB_VERSION_MLS		     19 | 
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| 35 | #define POLICYDB_VERSION_AVTAB		     20 | 
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| 36 | #define POLICYDB_VERSION_RANGETRANS	     21 | 
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| 37 | #define POLICYDB_VERSION_POLCAP		     22 | 
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| 38 | #define POLICYDB_VERSION_PERMISSIVE	     23 | 
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| 39 | #define POLICYDB_VERSION_BOUNDARY	     24 | 
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| 40 | #define POLICYDB_VERSION_FILENAME_TRANS	     25 | 
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| 41 | #define POLICYDB_VERSION_ROLETRANS	     26 | 
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| 42 | #define POLICYDB_VERSION_NEW_OBJECT_DEFAULTS 27 | 
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| 43 | #define POLICYDB_VERSION_DEFAULT_TYPE	     28 | 
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| 44 | #define POLICYDB_VERSION_CONSTRAINT_NAMES    29 | 
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| 45 | #define POLICYDB_VERSION_XPERMS_IOCTL	     30 | 
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| 46 | #define POLICYDB_VERSION_INFINIBAND	     31 | 
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| 47 | #define POLICYDB_VERSION_GLBLUB		     32 | 
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| 48 | #define POLICYDB_VERSION_COMP_FTRANS	     33 /* compressed filename transitions */ | 
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| 49 | #define POLICYDB_VERSION_COND_XPERMS	     34 /* extended permissions in conditional policies */ | 
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| 50 | #define POLICYDB_VERSION_NEVERAUDIT	     35 /* neveraudit types */ | 
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| 51 |  | 
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| 52 | /* Range of policy versions we understand*/ | 
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| 53 | #define POLICYDB_VERSION_MIN POLICYDB_VERSION_BASE | 
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| 54 | #define POLICYDB_VERSION_MAX POLICYDB_VERSION_NEVERAUDIT | 
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| 55 |  | 
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| 56 | /* Mask for just the mount related flags */ | 
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| 57 | #define SE_MNTMASK 0x0f | 
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| 58 | /* Super block security struct flags for mount options */ | 
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| 59 | /* BE CAREFUL, these need to be the low order bits for selinux_get_mnt_opts */ | 
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| 60 | #define CONTEXT_MNT	0x01 | 
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| 61 | #define FSCONTEXT_MNT	0x02 | 
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| 62 | #define ROOTCONTEXT_MNT 0x04 | 
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| 63 | #define DEFCONTEXT_MNT	0x08 | 
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| 64 | #define SBLABEL_MNT	0x10 | 
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| 65 | /* Non-mount related flags */ | 
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| 66 | #define SE_SBINITIALIZED 0x0100 | 
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| 67 | #define SE_SBPROC	 0x0200 | 
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| 68 | #define SE_SBGENFS	 0x0400 | 
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| 69 | #define SE_SBGENFS_XATTR 0x0800 | 
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| 70 | #define SE_SBNATIVE	 0x1000 | 
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| 71 |  | 
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| 72 | #define CONTEXT_STR	"context" | 
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| 73 | #define FSCONTEXT_STR	"fscontext" | 
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| 74 | #define ROOTCONTEXT_STR "rootcontext" | 
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| 75 | #define DEFCONTEXT_STR	"defcontext" | 
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| 76 | #define SECLABEL_STR	"seclabel" | 
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| 77 |  | 
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| 78 | struct netlbl_lsm_secattr; | 
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| 79 |  | 
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| 80 | extern int selinux_enabled_boot; | 
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| 81 |  | 
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| 82 | /* | 
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| 83 | * type_datum properties | 
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| 84 | * available at the kernel policy version >= POLICYDB_VERSION_BOUNDARY | 
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| 85 | */ | 
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| 86 | #define TYPEDATUM_PROPERTY_PRIMARY   0x0001 | 
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| 87 | #define TYPEDATUM_PROPERTY_ATTRIBUTE 0x0002 | 
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| 88 |  | 
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| 89 | /* limitation of boundary depth  */ | 
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| 90 | #define POLICYDB_BOUNDS_MAXDEPTH 4 | 
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| 91 |  | 
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| 92 | struct selinux_policy; | 
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| 93 |  | 
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| 94 | struct selinux_state { | 
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| 95 | #ifdef CONFIG_SECURITY_SELINUX_DEVELOP | 
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| 96 | bool enforcing; | 
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| 97 | #endif | 
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| 98 | bool initialized; | 
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| 99 | bool policycap[__POLICYDB_CAP_MAX]; | 
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| 100 |  | 
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| 101 | struct page *status_page; | 
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| 102 | struct mutex status_lock; | 
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| 103 |  | 
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| 104 | struct selinux_policy __rcu *policy; | 
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| 105 | struct mutex policy_mutex; | 
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| 106 | } __randomize_layout; | 
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| 107 |  | 
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| 108 | void selinux_avc_init(void); | 
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| 109 |  | 
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| 110 | extern struct selinux_state selinux_state; | 
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| 111 |  | 
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| 112 | static inline bool selinux_initialized(void) | 
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| 113 | { | 
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| 114 | /* do a synchronized load to avoid race conditions */ | 
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| 115 | return smp_load_acquire(&selinux_state.initialized); | 
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| 116 | } | 
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| 117 |  | 
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| 118 | static inline void selinux_mark_initialized(void) | 
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| 119 | { | 
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| 120 | /* do a synchronized write to avoid race conditions */ | 
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| 121 | smp_store_release(&selinux_state.initialized, true); | 
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| 122 | } | 
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| 123 |  | 
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| 124 | #ifdef CONFIG_SECURITY_SELINUX_DEVELOP | 
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| 125 | static inline bool enforcing_enabled(void) | 
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| 126 | { | 
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| 127 | return READ_ONCE(selinux_state.enforcing); | 
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| 128 | } | 
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| 129 |  | 
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| 130 | static inline void enforcing_set(bool value) | 
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| 131 | { | 
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| 132 | WRITE_ONCE(selinux_state.enforcing, value); | 
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| 133 | } | 
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| 134 | #else | 
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| 135 | static inline bool enforcing_enabled(void) | 
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| 136 | { | 
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| 137 | return true; | 
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| 138 | } | 
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| 139 |  | 
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| 140 | static inline void enforcing_set(bool value) | 
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| 141 | { | 
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| 142 | } | 
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| 143 | #endif | 
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| 144 |  | 
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| 145 | static inline bool checkreqprot_get(void) | 
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| 146 | { | 
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| 147 | /* non-zero/true checkreqprot values are no longer supported */ | 
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| 148 | return 0; | 
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| 149 | } | 
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| 150 |  | 
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| 151 | static inline bool selinux_policycap_netpeer(void) | 
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| 152 | { | 
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| 153 | return READ_ONCE(selinux_state.policycap[POLICYDB_CAP_NETPEER]); | 
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| 154 | } | 
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| 155 |  | 
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| 156 | static inline bool selinux_policycap_openperm(void) | 
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| 157 | { | 
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| 158 | return READ_ONCE(selinux_state.policycap[POLICYDB_CAP_OPENPERM]); | 
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| 159 | } | 
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| 160 |  | 
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| 161 | static inline bool selinux_policycap_extsockclass(void) | 
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| 162 | { | 
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| 163 | return READ_ONCE(selinux_state.policycap[POLICYDB_CAP_EXTSOCKCLASS]); | 
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| 164 | } | 
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| 165 |  | 
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| 166 | static inline bool selinux_policycap_alwaysnetwork(void) | 
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| 167 | { | 
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| 168 | return READ_ONCE(selinux_state.policycap[POLICYDB_CAP_ALWAYSNETWORK]); | 
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| 169 | } | 
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| 170 |  | 
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| 171 | static inline bool selinux_policycap_cgroupseclabel(void) | 
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| 172 | { | 
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| 173 | return READ_ONCE(selinux_state.policycap[POLICYDB_CAP_CGROUPSECLABEL]); | 
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| 174 | } | 
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| 175 |  | 
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| 176 | static inline bool selinux_policycap_nnp_nosuid_transition(void) | 
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| 177 | { | 
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| 178 | return READ_ONCE( | 
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| 179 | selinux_state.policycap[POLICYDB_CAP_NNP_NOSUID_TRANSITION]); | 
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| 180 | } | 
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| 181 |  | 
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| 182 | static inline bool selinux_policycap_genfs_seclabel_symlinks(void) | 
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| 183 | { | 
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| 184 | return READ_ONCE( | 
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| 185 | selinux_state.policycap[POLICYDB_CAP_GENFS_SECLABEL_SYMLINKS]); | 
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| 186 | } | 
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| 187 |  | 
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| 188 | static inline bool selinux_policycap_ioctl_skip_cloexec(void) | 
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| 189 | { | 
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| 190 | return READ_ONCE( | 
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| 191 | selinux_state.policycap[POLICYDB_CAP_IOCTL_SKIP_CLOEXEC]); | 
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| 192 | } | 
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| 193 |  | 
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| 194 | static inline bool selinux_policycap_userspace_initial_context(void) | 
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| 195 | { | 
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| 196 | return READ_ONCE( | 
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| 197 | selinux_state.policycap[POLICYDB_CAP_USERSPACE_INITIAL_CONTEXT]); | 
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| 198 | } | 
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| 199 |  | 
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| 200 | static inline bool selinux_policycap_netlink_xperm(void) | 
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| 201 | { | 
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| 202 | return READ_ONCE( | 
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| 203 | selinux_state.policycap[POLICYDB_CAP_NETLINK_XPERM]); | 
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| 204 | } | 
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| 205 |  | 
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| 206 | static inline bool selinux_policycap_functionfs_seclabel(void) | 
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| 207 | { | 
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| 208 | return READ_ONCE( | 
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| 209 | selinux_state.policycap[POLICYDB_CAP_FUNCTIONFS_SECLABEL]); | 
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| 210 | } | 
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| 211 |  | 
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| 212 | struct selinux_policy_convert_data; | 
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| 213 |  | 
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| 214 | struct selinux_load_state { | 
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| 215 | struct selinux_policy *policy; | 
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| 216 | struct selinux_policy_convert_data *convert_data; | 
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| 217 | }; | 
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| 218 |  | 
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| 219 | int security_mls_enabled(void); | 
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| 220 | int security_load_policy(void *data, size_t len, | 
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| 221 | struct selinux_load_state *load_state); | 
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| 222 | void selinux_policy_commit(struct selinux_load_state *load_state); | 
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| 223 | void selinux_policy_cancel(struct selinux_load_state *load_state); | 
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| 224 | int security_read_policy(void **data, size_t *len); | 
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| 225 | int security_read_state_kernel(void **data, size_t *len); | 
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| 226 | int security_policycap_supported(unsigned int req_cap); | 
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| 227 |  | 
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| 228 | #define SEL_VEC_MAX 32 | 
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| 229 | struct av_decision { | 
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| 230 | u32 allowed; | 
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| 231 | u32 auditallow; | 
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| 232 | u32 auditdeny; | 
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| 233 | u32 seqno; | 
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| 234 | u32 flags; | 
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| 235 | }; | 
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| 236 |  | 
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| 237 | #define XPERMS_ALLOWED	  1 | 
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| 238 | #define XPERMS_AUDITALLOW 2 | 
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| 239 | #define XPERMS_DONTAUDIT  4 | 
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| 240 |  | 
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| 241 | #define security_xperm_set(perms, x)  ((perms)[(x) >> 5] |= 1 << ((x)&0x1f)) | 
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| 242 | #define security_xperm_test(perms, x) (1 & ((perms)[(x) >> 5] >> ((x)&0x1f))) | 
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| 243 | struct extended_perms_data { | 
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| 244 | u32 p[8]; | 
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| 245 | }; | 
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| 246 |  | 
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| 247 | struct extended_perms_decision { | 
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| 248 | u8 used; | 
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| 249 | u8 driver; | 
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| 250 | u8 base_perm; | 
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| 251 | struct extended_perms_data *allowed; | 
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| 252 | struct extended_perms_data *auditallow; | 
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| 253 | struct extended_perms_data *dontaudit; | 
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| 254 | }; | 
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| 255 |  | 
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| 256 | struct extended_perms { | 
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| 257 | u16 len; /* length associated decision chain */ | 
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| 258 | u8 base_perms; /* which base permissions are covered */ | 
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| 259 | struct extended_perms_data drivers; /* flag drivers that are used */ | 
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| 260 | }; | 
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| 261 |  | 
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| 262 | /* definitions of av_decision.flags */ | 
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| 263 | #define AVD_FLAGS_PERMISSIVE 0x0001 | 
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| 264 | #define AVD_FLAGS_NEVERAUDIT  0x0002 | 
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| 265 |  | 
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| 266 | void security_compute_av(u32 ssid, u32 tsid, u16 tclass, | 
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| 267 | struct av_decision *avd, | 
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| 268 | struct extended_perms *xperms); | 
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| 269 |  | 
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| 270 | void security_compute_xperms_decision(u32 ssid, u32 tsid, u16 tclass, u8 driver, | 
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| 271 | u8 base_perm, | 
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| 272 | struct extended_perms_decision *xpermd); | 
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| 273 |  | 
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| 274 | void security_compute_av_user(u32 ssid, u32 tsid, u16 tclass, | 
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| 275 | struct av_decision *avd); | 
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| 276 |  | 
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| 277 | int security_transition_sid(u32 ssid, u32 tsid, u16 tclass, | 
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| 278 | const struct qstr *qstr, u32 *out_sid); | 
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| 279 |  | 
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| 280 | int security_transition_sid_user(u32 ssid, u32 tsid, u16 tclass, | 
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| 281 | const char *objname, u32 *out_sid); | 
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| 282 |  | 
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| 283 | int security_member_sid(u32 ssid, u32 tsid, u16 tclass, u32 *out_sid); | 
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| 284 |  | 
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| 285 | int security_change_sid(u32 ssid, u32 tsid, u16 tclass, u32 *out_sid); | 
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| 286 |  | 
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| 287 | int security_sid_to_context(u32 sid, char **scontext, u32 *scontext_len); | 
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| 288 |  | 
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| 289 | int security_sid_to_context_force(u32 sid, char **scontext, u32 *scontext_len); | 
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| 290 |  | 
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| 291 | int security_sid_to_context_inval(u32 sid, char **scontext, u32 *scontext_len); | 
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| 292 |  | 
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| 293 | int security_context_to_sid(const char *scontext, u32 scontext_len, | 
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| 294 | u32 *out_sid, gfp_t gfp); | 
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| 295 |  | 
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| 296 | int security_context_str_to_sid(const char *scontext, u32 *out_sid, gfp_t gfp); | 
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| 297 |  | 
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| 298 | int security_context_to_sid_default(const char *scontext, u32 scontext_len, | 
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| 299 | u32 *out_sid, u32 def_sid, gfp_t gfp_flags); | 
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| 300 |  | 
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| 301 | int security_context_to_sid_force(const char *scontext, u32 scontext_len, | 
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| 302 | u32 *sid); | 
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| 303 |  | 
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| 304 | int security_get_user_sids(u32 fromsid, const char *username, u32 **sids, u32 *nel); | 
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| 305 |  | 
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| 306 | int security_port_sid(u8 protocol, u16 port, u32 *out_sid); | 
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| 307 |  | 
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| 308 | int security_ib_pkey_sid(u64 subnet_prefix, u16 pkey_num, u32 *out_sid); | 
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| 309 |  | 
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| 310 | int security_ib_endport_sid(const char *dev_name, u8 port_num, u32 *out_sid); | 
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| 311 |  | 
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| 312 | int security_netif_sid(const char *name, u32 *if_sid); | 
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| 313 |  | 
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| 314 | int security_node_sid(u16 domain, const void *addr, u32 addrlen, u32 *out_sid); | 
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| 315 |  | 
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| 316 | int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid, | 
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| 317 | u16 tclass); | 
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| 318 |  | 
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| 319 | int security_validate_transition_user(u32 oldsid, u32 newsid, u32 tasksid, | 
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| 320 | u16 tclass); | 
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| 321 |  | 
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| 322 | int security_bounded_transition(u32 old_sid, u32 new_sid); | 
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| 323 |  | 
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| 324 | int security_sid_mls_copy(u32 sid, u32 mls_sid, u32 *new_sid); | 
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| 325 |  | 
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| 326 | int security_net_peersid_resolve(u32 nlbl_sid, u32 nlbl_type, u32 xfrm_sid, | 
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| 327 | u32 *peer_sid); | 
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| 328 |  | 
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| 329 | int security_get_classes(struct selinux_policy *policy, char ***classes, | 
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| 330 | u32 *nclasses); | 
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| 331 | int security_get_permissions(struct selinux_policy *policy, const char *class, | 
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| 332 | char ***perms, u32 *nperms); | 
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| 333 | int security_get_reject_unknown(void); | 
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| 334 | int security_get_allow_unknown(void); | 
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| 335 |  | 
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| 336 | #define SECURITY_FS_USE_XATTR	 1 /* use xattr */ | 
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| 337 | #define SECURITY_FS_USE_TRANS	 2 /* use transition SIDs, e.g. devpts/tmpfs */ | 
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| 338 | #define SECURITY_FS_USE_TASK	 3 /* use task SIDs, e.g. pipefs/sockfs */ | 
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| 339 | #define SECURITY_FS_USE_GENFS	 4 /* use the genfs support */ | 
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| 340 | #define SECURITY_FS_USE_NONE	 5 /* no labeling support */ | 
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| 341 | #define SECURITY_FS_USE_MNTPOINT 6 /* use mountpoint labeling */ | 
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| 342 | #define SECURITY_FS_USE_NATIVE	 7 /* use native label support */ | 
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| 343 | #define SECURITY_FS_USE_MAX	 7 /* Highest SECURITY_FS_USE_XXX */ | 
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| 344 |  | 
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| 345 | int security_fs_use(struct super_block *sb); | 
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| 346 |  | 
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| 347 | int security_genfs_sid(const char *fstype, const char *path, u16 sclass, | 
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| 348 | u32 *sid); | 
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| 349 |  | 
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| 350 | int selinux_policy_genfs_sid(struct selinux_policy *policy, const char *fstype, | 
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| 351 | const char *path, u16 sclass, u32 *sid); | 
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| 352 |  | 
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| 353 | #ifdef CONFIG_NETLABEL | 
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| 354 | int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr, | 
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| 355 | u32 *sid); | 
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| 356 |  | 
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| 357 | int security_netlbl_sid_to_secattr(u32 sid, struct netlbl_lsm_secattr *secattr); | 
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| 358 | #else | 
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| 359 | static inline int | 
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| 360 | security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr, u32 *sid) | 
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| 361 | { | 
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| 362 | return -EIDRM; | 
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| 363 | } | 
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| 364 |  | 
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| 365 | static inline int | 
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| 366 | security_netlbl_sid_to_secattr(u32 sid, struct netlbl_lsm_secattr *secattr) | 
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| 367 | { | 
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| 368 | return -ENOENT; | 
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| 369 | } | 
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| 370 | #endif /* CONFIG_NETLABEL */ | 
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| 371 |  | 
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| 372 | const char *security_get_initial_sid_context(u32 sid); | 
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| 373 |  | 
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| 374 | /* | 
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| 375 | * status notifier using mmap interface | 
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| 376 | */ | 
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| 377 | extern struct page *selinux_kernel_status_page(void); | 
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| 378 |  | 
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| 379 | #define SELINUX_KERNEL_STATUS_VERSION 1 | 
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| 380 | struct selinux_kernel_status { | 
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| 381 | u32 version; /* version number of the structure */ | 
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| 382 | u32 sequence; /* sequence number of seqlock logic */ | 
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| 383 | u32 enforcing; /* current setting of enforcing mode */ | 
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| 384 | u32 policyload; /* times of policy reloaded */ | 
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| 385 | u32 deny_unknown; /* current setting of deny_unknown */ | 
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| 386 | /* | 
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| 387 | * The version > 0 supports above members. | 
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| 388 | */ | 
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| 389 | } __packed; | 
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| 390 |  | 
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| 391 | extern void selinux_status_update_setenforce(bool enforcing); | 
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| 392 | extern void selinux_status_update_policyload(u32 seqno); | 
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| 393 | extern void selinux_complete_init(void); | 
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| 394 | extern struct path selinux_null; | 
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| 395 | extern void selnl_notify_setenforce(int val); | 
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| 396 | extern void selnl_notify_policyload(u32 seqno); | 
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| 397 | extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm); | 
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| 398 |  | 
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| 399 | extern void avtab_cache_init(void); | 
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| 400 | extern void ebitmap_cache_init(void); | 
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| 401 | extern void hashtab_cache_init(void); | 
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| 402 | extern int security_sidtab_hash_stats(char *page); | 
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| 403 |  | 
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| 404 | #endif /* _SELINUX_SECURITY_H_ */ | 
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| 405 |  | 
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