Stephen Smalley | f074036 | 2012-01-04 12:30:47 -0500 | [diff] [blame] | 1 | /* |
| 2 | * This file describes the internal interface used by the AVC |
| 3 | * for calling the user-supplied memory allocation, supplemental |
| 4 | * auditing, and locking routine, as well as incrementing the |
| 5 | * statistics fields. |
| 6 | * |
| 7 | * Author : Eamon Walsh <ewalsh@epoch.ncsc.mil> |
| 8 | */ |
| 9 | #ifndef _SELINUX_AVC_INTERNAL_H_ |
| 10 | #define _SELINUX_AVC_INTERNAL_H_ |
| 11 | |
| 12 | #include <stdio.h> |
| 13 | #include <stdlib.h> |
| 14 | #include <string.h> |
| 15 | #include <selinux/avc.h> |
| 16 | #include "callbacks.h" |
| 17 | #include "dso.h" |
| 18 | |
| 19 | /* callback pointers */ |
| 20 | extern void *(*avc_func_malloc) (size_t) hidden; |
| 21 | extern void (*avc_func_free) (void *)hidden; |
| 22 | |
| 23 | extern void (*avc_func_log) (const char *, ...)hidden; |
| 24 | extern void (*avc_func_audit) (void *, security_class_t, char *, size_t)hidden; |
| 25 | |
| 26 | extern int avc_using_threads hidden; |
| 27 | extern int avc_app_main_loop hidden; |
| 28 | extern void *(*avc_func_create_thread) (void (*)(void))hidden; |
| 29 | extern void (*avc_func_stop_thread) (void *)hidden; |
| 30 | |
| 31 | extern void *(*avc_func_alloc_lock) (void)hidden; |
| 32 | extern void (*avc_func_get_lock) (void *)hidden; |
| 33 | extern void (*avc_func_release_lock) (void *)hidden; |
| 34 | extern void (*avc_func_free_lock) (void *)hidden; |
| 35 | |
| 36 | static inline void set_callbacks(const struct avc_memory_callback *mem_cb, |
| 37 | const struct avc_log_callback *log_cb, |
| 38 | const struct avc_thread_callback *thread_cb, |
| 39 | const struct avc_lock_callback *lock_cb) |
| 40 | { |
| 41 | if (mem_cb) { |
| 42 | avc_func_malloc = mem_cb->func_malloc; |
| 43 | avc_func_free = mem_cb->func_free; |
| 44 | } |
| 45 | if (log_cb) { |
| 46 | avc_func_log = log_cb->func_log; |
| 47 | avc_func_audit = log_cb->func_audit; |
| 48 | } |
| 49 | if (thread_cb) { |
| 50 | avc_using_threads = 1; |
| 51 | avc_func_create_thread = thread_cb->func_create_thread; |
| 52 | avc_func_stop_thread = thread_cb->func_stop_thread; |
| 53 | } |
| 54 | if (lock_cb) { |
| 55 | avc_func_alloc_lock = lock_cb->func_alloc_lock; |
| 56 | avc_func_get_lock = lock_cb->func_get_lock; |
| 57 | avc_func_release_lock = lock_cb->func_release_lock; |
| 58 | avc_func_free_lock = lock_cb->func_free_lock; |
| 59 | } |
| 60 | } |
| 61 | |
| 62 | /* message prefix and enforcing mode*/ |
| 63 | #define AVC_PREFIX_SIZE 16 |
| 64 | extern char avc_prefix[AVC_PREFIX_SIZE] hidden; |
| 65 | extern int avc_running hidden; |
| 66 | extern int avc_enforcing hidden; |
| 67 | extern int avc_setenforce hidden; |
| 68 | |
| 69 | /* user-supplied callback interface for avc */ |
| 70 | static inline void *avc_malloc(size_t size) |
| 71 | { |
| 72 | return avc_func_malloc ? avc_func_malloc(size) : malloc(size); |
| 73 | } |
| 74 | |
| 75 | static inline void avc_free(void *ptr) |
| 76 | { |
| 77 | if (avc_func_free) |
| 78 | avc_func_free(ptr); |
| 79 | else |
| 80 | free(ptr); |
| 81 | } |
| 82 | |
| 83 | /* this is a macro in order to use the variadic capability. */ |
| 84 | #define avc_log(type, format...) \ |
| 85 | if (avc_func_log) \ |
| 86 | avc_func_log(format); \ |
| 87 | else \ |
| 88 | selinux_log(type, format); |
| 89 | |
| 90 | static inline void avc_suppl_audit(void *ptr, security_class_t class, |
| 91 | char *buf, size_t len) |
| 92 | { |
| 93 | if (avc_func_audit) |
| 94 | avc_func_audit(ptr, class, buf, len); |
| 95 | else |
| 96 | selinux_audit(ptr, class, buf, len); |
| 97 | } |
| 98 | |
| 99 | static inline void *avc_create_thread(void (*run) (void)) |
| 100 | { |
| 101 | return avc_func_create_thread ? avc_func_create_thread(run) : NULL; |
| 102 | } |
| 103 | |
| 104 | static inline void avc_stop_thread(void *thread) |
| 105 | { |
| 106 | if (avc_func_stop_thread) |
| 107 | avc_func_stop_thread(thread); |
| 108 | } |
| 109 | |
| 110 | static inline void *avc_alloc_lock(void) |
| 111 | { |
| 112 | return avc_func_alloc_lock ? avc_func_alloc_lock() : NULL; |
| 113 | } |
| 114 | |
| 115 | static inline void avc_get_lock(void *lock) |
| 116 | { |
| 117 | if (avc_func_get_lock) |
| 118 | avc_func_get_lock(lock); |
| 119 | } |
| 120 | |
| 121 | static inline void avc_release_lock(void *lock) |
| 122 | { |
| 123 | if (avc_func_release_lock) |
| 124 | avc_func_release_lock(lock); |
| 125 | } |
| 126 | |
| 127 | static inline void avc_free_lock(void *lock) |
| 128 | { |
| 129 | if (avc_func_free_lock) |
| 130 | avc_func_free_lock(lock); |
| 131 | } |
| 132 | |
| 133 | /* statistics helper routines */ |
| 134 | #ifdef AVC_CACHE_STATS |
| 135 | |
| 136 | #define avc_cache_stats_incr(field) \ |
| 137 | cache_stats.field ++; |
| 138 | #define avc_cache_stats_add(field, num) \ |
| 139 | cache_stats.field += num; |
| 140 | |
| 141 | #else |
| 142 | |
| 143 | #define avc_cache_stats_incr(field) |
| 144 | #define avc_cache_stats_add(field, num) |
| 145 | |
| 146 | #endif |
| 147 | |
| 148 | /* logging helper routines */ |
| 149 | #define AVC_AUDIT_BUFSIZE 1024 |
| 150 | |
| 151 | /* again, we need the variadic capability here */ |
| 152 | #define log_append(buf,format...) \ |
| 153 | snprintf(buf+strlen(buf), AVC_AUDIT_BUFSIZE-strlen(buf), format) |
| 154 | |
| 155 | /* internal callbacks */ |
| 156 | int avc_ss_grant(security_id_t ssid, security_id_t tsid, |
| 157 | security_class_t tclass, access_vector_t perms, |
| 158 | uint32_t seqno) hidden; |
| 159 | int avc_ss_try_revoke(security_id_t ssid, security_id_t tsid, |
| 160 | security_class_t tclass, |
| 161 | access_vector_t perms, uint32_t seqno, |
| 162 | access_vector_t * out_retained) hidden; |
| 163 | int avc_ss_revoke(security_id_t ssid, security_id_t tsid, |
| 164 | security_class_t tclass, access_vector_t perms, |
| 165 | uint32_t seqno) hidden; |
| 166 | int avc_ss_reset(uint32_t seqno) hidden; |
| 167 | int avc_ss_set_auditallow(security_id_t ssid, security_id_t tsid, |
| 168 | security_class_t tclass, access_vector_t perms, |
| 169 | uint32_t seqno, uint32_t enable) hidden; |
| 170 | int avc_ss_set_auditdeny(security_id_t ssid, security_id_t tsid, |
| 171 | security_class_t tclass, access_vector_t perms, |
| 172 | uint32_t seqno, uint32_t enable) hidden; |
| 173 | |
| 174 | /* netlink kernel message code */ |
| 175 | extern int avc_netlink_trouble hidden; |
| 176 | |
| 177 | hidden_proto(avc_av_stats) |
| 178 | hidden_proto(avc_cleanup) |
| 179 | hidden_proto(avc_reset) |
| 180 | hidden_proto(avc_audit) |
| 181 | hidden_proto(avc_has_perm_noaudit) |
| 182 | #endif /* _SELINUX_AVC_INTERNAL_H_ */ |