1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright 2010 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #ifndef _BSM_AUDIT_KERNEL_H 27 #define _BSM_AUDIT_KERNEL_H 28 29 30 /* 31 * This file contains the basic auditing control structure definitions. 32 */ 33 34 #include <c2/audit_kevents.h> 35 #include <sys/priv_impl.h> 36 #include <sys/taskq.h> 37 #include <sys/zone.h> 38 39 #include <sys/tsol/label.h> 40 41 #ifdef __cplusplus 42 extern "C" { 43 #endif 44 45 /* 46 * This table contains the mapping from the system call ID to a corresponding 47 * audit event. 48 * 49 * au_init() is a function called at the beginning of the system call that 50 * performs any necessary setup/processing. It maps the call into the 51 * appropriate event, depending on the system call arguments. It is called 52 * by audit_start() from trap.c . 53 * 54 * au_event is the audit event associated with the system call. Most of the 55 * time it will map directly from the system call i.e. There is one system 56 * call associated with the event. In some cases, such as shmsys, or open, 57 * the au_start() function will map the system call to more than one event, 58 * depending on the system call arguments. 59 * 60 * au_start() is a function that provides per system call processing at the 61 * beginning of a system call. It is mainly concerned with preseving the 62 * audit record components that may be altered so that we can determine 63 * what the original paramater was before as well as after the system call. 64 * It is possible that au_start() may be taken away. It might be cleaner to 65 * define flags in au_ctrl to save a designated argument. For the moment we 66 * support both mechanisms, however the use of au_start() will be reviewed 67 * for 4.1.1 and CMW and ZEUS to see if such a general method is justified. 68 * 69 * au_finish() is a function that provides per system call processing at the 70 * completion of a system call. In certain circumstances, the type of audit 71 * event depends on intermidiate results during the processing of the system 72 * call. It is called in audit_finish() from trap.c . 73 * 74 * au_ctrl is a control vector that indicates what processing might have to 75 * be performed, even if there is no auditing for this system call. At 76 * present this is mostly for path processing for chmod, chroot. We need to 77 * process the path information in vfs_lookup, even when we are not auditing 78 * the system call in the case of chdir and chroot. 79 */ 80 /* 81 * Defines for au_ctrl 82 */ 83 #define S2E_SP PAD_SAVPATH /* save path for later use */ 84 #define S2E_MLD PAD_MLD /* only one lookup per system call */ 85 #define S2E_NPT PAD_NOPATH /* force no path in audit record */ 86 #define S2E_PUB PAD_PUBLIC_EV /* syscall is defined as a public op */ 87 #define S2E_ATC PAD_ATCALL /* syscall is one of the *at() family */ 88 89 /* 90 * At present, we are using the audit classes imbedded with in the kernel. Each 91 * event has a bit mask determining which classes the event is associated. 92 * The table audit_e2s maps the audit event ID to the audit state. 93 * 94 * Note that this may change radically. If we use a bit vector for the audit 95 * class, we can allow granularity at the event ID for each user. In this 96 * case, the vector would be determined at user level and passed to the kernel 97 * via the setaudit system call. 98 */ 99 100 /* 101 * The audit_pad structure holds paths for the current root and directory 102 * for the process, as well as for open files and directly manipulated objects. 103 * The reference count minimizes data copies since the process's current 104 * directory changes very seldom. 105 */ 106 struct audit_path { 107 uint_t audp_ref; /* reference count */ 108 uint_t audp_size; /* allocated size of this structure */ 109 uint_t audp_cnt; /* number of path sections */ 110 char *audp_sect[1]; /* path section pointers */ 111 /* audp_sect[0] is the path name */ 112 /* audp_sect[1+] are attribute paths */ 113 }; 114 115 /* 116 * The structure of the terminal ID within the kernel is different from the 117 * terminal ID in user space. It is a combination of port and IP address. 118 */ 119 120 struct au_termid { 121 dev_t at_port; 122 uint_t at_type; 123 uint_t at_addr[4]; 124 }; 125 typedef struct au_termid au_termid_t; 126 127 /* 128 * Attributes for deferring the queuing of an event. 129 */ 130 typedef struct au_defer_info { 131 struct au_defer_info *audi_next; /* next on linked list */ 132 void *audi_ad; /* audit record */ 133 au_event_t audi_e_type; /* audit event id */ 134 au_emod_t audi_e_mod; /* audit event modifier */ 135 int audi_flag; /* au_close*() flags */ 136 timestruc_t audi_atime; /* audit event timestamp */ 137 } au_defer_info_t; 138 139 /* 140 * The structure p_audit_data hangs off of the process structure. It contains 141 * all of the audit information necessary to manage the audit record generation 142 * for each process. 143 * 144 * The pad_lock is constructed in the kmem_cache; the rest is combined 145 * in a sub structure so it can be copied/zeroed in one statement. 146 * 147 * The members have been reordered for maximum packing on 64 bit Solaris. 148 */ 149 struct p_audit_data { 150 kmutex_t pad_lock; /* lock pad data during changes */ 151 struct _pad_data { 152 struct audit_path *pad_root; /* process root path */ 153 struct audit_path *pad_cwd; /* process cwd path */ 154 au_mask_t pad_newmask; /* pending new mask */ 155 int pad_flags; 156 } pad_data; 157 }; 158 typedef struct p_audit_data p_audit_data_t; 159 160 #define pad_root pad_data.pad_root 161 #define pad_cwd pad_data.pad_cwd 162 #define pad_newmask pad_data.pad_newmask 163 #define pad_flags pad_data.pad_flags 164 165 /* 166 * Defines for pad_flags 167 */ 168 #define PAD_SETMASK 0x00000001 /* need to complete pending setmask */ 169 170 extern kmem_cache_t *au_pad_cache; 171 172 /* 173 * Defines for tad_ctrl 174 */ 175 #define PAD_SAVPATH 0x00000001 /* save path for further processing */ 176 #define PAD_MLD 0x00000002 /* system call involves MLD */ 177 #define PAD_NOPATH 0x00000004 /* force no paths in audit record */ 178 #define PAD_ABSPATH 0x00000008 /* path from lookup is absolute */ 179 #define PAD_NOATTRB 0x00000010 /* do not automatically add attribute */ 180 /* 0x20 unused */ 181 #define PAD_ATCALL 0x00000040 /* *at() syscall, like openat() */ 182 #define PAD_LFLOAT 0x00000080 /* Label float */ 183 #define PAD_NOAUDIT 0x00000100 /* discard audit record */ 184 #define PAD_PATHFND 0x00000200 /* found path, don't retry lookup */ 185 #define PAD_SPRIV 0x00000400 /* succ priv use. extra audit_finish */ 186 #define PAD_FPRIV 0x00000800 /* fail priv use. extra audit_finish */ 187 #define PAD_SMAC 0x00001000 /* succ mac use. extra audit_finish */ 188 #define PAD_FMAC 0x00002000 /* fail mac use. extra audit_finish */ 189 #define PAD_AUDITME 0x00004000 /* audit me because of NFS operation */ 190 #define PAD_ATTPATH 0x00008000 /* attribute file lookup */ 191 #define PAD_TRUE_CREATE 0x00010000 /* true create, file not found */ 192 #define PAD_CORE 0x00020000 /* save attribute during core dump */ 193 #define PAD_ERRJMP 0x00040000 /* abort record generation on error */ 194 #define PAD_PUBLIC_EV 0x00080000 /* syscall is defined as a public op */ 195 196 /* 197 * The structure t_audit_data hangs off of the thread structure. It contains 198 * all of the audit information necessary to manage the audit record generation 199 * for each thread. 200 * 201 */ 202 203 struct t_audit_data { 204 kthread_id_t tad_thread; /* DEBUG pointer to parent thread */ 205 unsigned int tad_scid; /* system call ID for finish */ 206 au_event_t tad_event; /* event for audit record */ 207 au_emod_t tad_evmod; /* event modifier for audit record */ 208 int tad_ctrl; /* audit control/status flags */ 209 void *tad_errjmp; /* error longjmp (audit record aborted) */ 210 int tad_flag; /* to audit or not to audit */ 211 uint32_t tad_audit; /* auditing enabled/disabled */ 212 struct audit_path *tad_aupath; /* captured at vfs_lookup */ 213 struct audit_path *tad_atpath; /* openat prefix, path of fd */ 214 struct vnode *tad_vn; /* saved inode from vfs_lookup */ 215 caddr_t tad_ad; /* base of accumulated audit data */ 216 au_defer_info_t *tad_defer_head; /* queue of records to defer */ 217 /* until syscall end: */ 218 au_defer_info_t *tad_defer_tail; /* tail of defer queue */ 219 priv_set_t tad_sprivs; /* saved (success) used privs */ 220 priv_set_t tad_fprivs; /* saved (failed) used privs */ 221 }; 222 typedef struct t_audit_data t_audit_data_t; 223 224 /* 225 * The f_audit_data structure hangs off of the file structure. It contains 226 * three fields of data. The audit ID, the audit state, and a path name. 227 */ 228 229 struct f_audit_data { 230 kthread_id_t fad_thread; /* DEBUG creating thread */ 231 int fad_flags; /* audit control flags */ 232 struct audit_path *fad_aupath; /* path from vfs_lookup */ 233 }; 234 typedef struct f_audit_data f_audit_data_t; 235 236 #define FAD_READ 0x0001 /* read system call seen */ 237 #define FAD_WRITE 0x0002 /* write system call seen */ 238 239 #define P2A(p) (p->p_audit_data) 240 #define T2A(t) (t->t_audit_data) 241 #define U2A(u) (curthread->t_audit_data) 242 #define F2A(f) (f->f_audit_data) 243 244 #define u_ad ((U2A(u))->tad_ad) 245 #define ad_ctrl ((U2A(u))->tad_ctrl) 246 #define ad_flag ((U2A(u))->tad_flag) 247 248 #define AU_BUFSIZE 128 /* buffer size for the buffer pool */ 249 250 struct au_buff { 251 char buf[AU_BUFSIZE]; 252 struct au_buff *next_buf; 253 struct au_buff *next_rec; 254 ushort_t rec_len; 255 uchar_t len; 256 uchar_t flag; 257 }; 258 259 typedef struct au_buff au_buff_t; 260 261 /* 262 * Kernel audit queue structure. 263 */ 264 struct audit_queue { 265 au_buff_t *head; /* head of queue */ 266 au_buff_t *tail; /* tail of queue */ 267 ssize_t cnt; /* number elements on queue */ 268 size_t hiwater; /* high water mark to block */ 269 size_t lowater; /* low water mark to restart */ 270 size_t bufsz; /* audit trail write buffer size */ 271 size_t buflen; /* audit trail buffer length in use */ 272 clock_t delay; /* delay before flushing queue */ 273 int wt_block; /* writer is blocked (1) */ 274 int rd_block; /* reader is blocked (1) */ 275 kmutex_t lock; /* mutex lock for queue modification */ 276 kcondvar_t write_cv; /* sleep structure for write block */ 277 kcondvar_t read_cv; /* sleep structure for read block */ 278 }; 279 280 281 union rval; 282 struct audit_s2e { 283 au_event_t (*au_init)(au_event_t); 284 /* convert au_event to real audit event ID */ 285 286 int au_event; /* default audit event for this system call */ 287 void (*au_start)(struct t_audit_data *); 288 /* pre-system call audit processing */ 289 void (*au_finish)(struct t_audit_data *, int, union rval *); 290 /* post-system call audit processing */ 291 int au_ctrl; /* control flags for auditing actions */ 292 }; 293 294 extern struct audit_s2e audit_s2e[]; 295 296 #define AUK_VALID 0x5A5A5A5A 297 #define AUK_INVALID 0 298 /* 299 * per zone audit context 300 */ 301 struct au_kcontext { 302 uint32_t auk_valid; 303 zoneid_t auk_zid; 304 305 boolean_t auk_hostaddr_valid; 306 int auk_sequence; 307 int auk_auditstate; 308 int auk_output_active; 309 struct vnode *auk_current_vp; 310 uint32_t auk_policy; 311 312 struct audit_queue auk_queue; 313 314 au_dbuf_t *auk_dbuffer; /* auditdoor output */ 315 316 au_stat_t auk_statistics; 317 318 struct auditinfo_addr auk_info; 319 kmutex_t auk_eagain_mutex; /* door call retry */ 320 kcondvar_t auk_eagain_cv; 321 322 taskq_t *auk_taskq; /* output thread */ 323 324 /* Only one audit svc per zone at a time */ 325 /* With the elimination of auditsvc, can this also go? see 6648414 */ 326 kmutex_t auk_svc_lock; 327 328 au_state_t auk_ets[MAX_KEVENTS + 1]; 329 }; 330 #ifndef AUK_CONTEXT_T 331 #define AUK_CONTEXT_T 332 typedef struct au_kcontext au_kcontext_t; 333 #endif 334 335 extern zone_key_t au_zone_key; 336 337 /* 338 * Kernel auditing external variables 339 */ 340 extern uint32_t audit_policy; 341 extern int audit_active; 342 343 extern struct audit_queue au_queue; 344 extern struct p_audit_data *pad0; 345 extern struct t_audit_data *tad0; 346 347 /* 348 * audit_path support routines 349 */ 350 void au_pathhold(struct audit_path *); 351 void au_pathrele(struct audit_path *); 352 struct audit_path *au_pathdup(const struct audit_path *, int, int); 353 354 void au_pad_init(void); 355 356 int auditctl(int cmd, caddr_t data, int length); 357 int auditdoor(int fd); 358 int getauid(caddr_t); 359 int setauid(caddr_t); 360 int getaudit(caddr_t); 361 int getaudit_addr(caddr_t, int); 362 int setaudit(caddr_t); 363 int setaudit_addr(caddr_t, int); 364 365 /* 366 * Macros to hide asynchronous, non-blocking audit record start and finish 367 * processing. 368 * 369 * NOTE: must be used in (void) funcction () { ... } 370 */ 371 372 #define AUDIT_ASYNC_START(rp, audit_event, sorf) \ 373 { \ 374 label_t jb; \ 375 if (setjmp(&jb)) { \ 376 /* cleanup any residual audit data */ \ 377 audit_async_drop((caddr_t *)&(rp), 0); \ 378 return; \ 379 } \ 380 /* auditing enabled and we're preselected for this event? */ \ 381 if (audit_async_start(&jb, audit_event, sorf)) { \ 382 return; \ 383 } \ 384 } 385 386 #define AUDIT_ASYNC_FINISH(rp, audit_event, event_modifier, event_time) \ 387 audit_async_finish((caddr_t *)&(rp), audit_event, event_modifier, \ 388 event_time); 389 390 391 #ifdef _KERNEL 392 au_buff_t *au_get_buff(void), *au_free_buff(au_buff_t *); 393 #endif 394 395 /* 396 * Macro for uniform "subject" token(s) generation 397 */ 398 #define AUDIT_SETSUBJ_GENERIC(u, c, a, k, p) \ 399 (au_write((u), au_to_subject(crgetuid(c), \ 400 crgetgid(c), crgetruid(c), crgetrgid(c), \ 401 p, (a)->ai_auid, (a)->ai_asid, \ 402 &((a)->ai_termid)))); \ 403 ((is_system_labeled()) ? au_write((u), \ 404 au_to_label(CR_SL((c)))) : (void) 0); \ 405 (((k)->auk_policy & AUDIT_GROUP) ? au_write((u),\ 406 au_to_groups(crgetgroups(c), \ 407 crgetngroups(c))) : (void) 0) 408 409 #define AUDIT_SETSUBJ(u, c, a, k) \ 410 AUDIT_SETSUBJ_GENERIC(u, c, a, k, curproc->p_pid) 411 412 /* 413 * Macros for type conversion 414 */ 415 416 /* au_membuf head, to typed data */ 417 #define memtod(x, t) ((t)x->buf) 418 419 /* au_membuf types */ 420 #define MT_FREE 0 /* should be on free list */ 421 #define MT_DATA 1 /* dynamic (data) allocation */ 422 423 /* flags to au_memget */ 424 #define DONTWAIT 0 425 #define WAIT 1 426 427 #define AU_PACK 1 /* pack data in au_append_rec() */ 428 #define AU_LINK 0 /* link data in au_append_rec() */ 429 430 /* flags to async routines */ 431 #define AU_BACKEND 1 /* called from softcall backend */ 432 433 #ifdef __cplusplus 434 } 435 #endif 436 437 #endif /* _BSM_AUDIT_KERNEL_H */ 438