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Add support for extended header BSM tokens. Currently we use the

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regular header tokens.  The extended header tokens contain an IP
or IPv6 address which makes it possible to identify which host an
audit record came from when audit records are centralized.

If the host information has not been specified, the system will
default to the old style headers.  Otherwise, audit records that
are created as a result of system calls will contain host information.

This implemented has been designed to be consistent with the Solaris
implementation.  Host information is set/retrieved using the A_GETKAUDIT
and A_SETKAUDIT auditon(2) commands.  These commands require that a
pointer to a auditinfo_addr_t object is passed.  Currently only IP and
IPv6 address families are supported.

The users pace bits associated with this change will follow in an
openbsm import.

Reviewed by:	rwatson, (sson, wsalamon (older version))
MFC after:	1 month
This commit is contained in:
Christian S.J. Peron 2008-11-11 21:57:03 +00:00
parent 46da6c4869
commit ffbcef5a42
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=184856
8 changed files with 124 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
sys/bsm/audit_internal.h
View File

@ -72,7 +72,9 @@ typedef struct au_record au_record_t;
* token structures may contain pointers of whose contents we do not know the
* size (e.g text tokens).
*/
#define AUDIT_HEADER_EX_SIZE(a) ((a)->ai_termid.at_type+18+sizeof(u_int32_t))
#define AUDIT_HEADER_SIZE 18
#define MAX_AUDIT_HEADER_SIZE (5*sizeof(u_int32_t)+18)
#define AUDIT_TRAILER_SIZE 7
/*

3
sys/bsm/audit_record.h
View File

@ -244,10 +244,13 @@ token_t *au_to_file(char *file, struct timeval tm);
token_t *au_to_header32_tm(int rec_size, au_event_t e_type, au_emod_t e_mod,
struct timeval tm);
token_t *au_to_header32_ex_tm(int rec_size, au_event_t e_type, au_emod_t e_mod,
struct timeval tm, struct auditinfo_addr *aia);
token_t *au_to_header64_tm(int rec_size, au_event_t e_type, au_emod_t e_mod,
struct timeval tm);
#if !defined(KERNEL) && !defined(_KERNEL)
token_t *au_to_header(int rec_size, au_event_t e_type, au_emod_t e_mod);
token_t *au_to_header_ex(int rec_size, au_event_t e_type, au_emod_t e_mod);
token_t *au_to_header32(int rec_size, au_event_t e_type, au_emod_t e_mod);
token_t *au_to_header64(int rec_size, au_event_t e_type, au_emod_t e_mod);
#endif

43
sys/security/audit/audit.c
View File

@ -157,6 +157,45 @@ struct cv audit_watermark_cv;
*/
static struct cv audit_fail_cv;
/*
* Kernel audit information. This will store the current audit address
* or host information that the kernel will use when it's generating
* audit records. This data is modified by the A_GET{SET}KAUDIT auditon(2)
* command.
*/
static struct auditinfo_addr audit_kinfo;
static struct rwlock audit_kinfo_lock;
#define KINFO_LOCK_INIT() rw_init(&audit_kinfo_lock, "kernel audit info lock")
#define KINFO_RLOCK() rw_rlock(&audit_kinfo_lock)
#define KINFO_WLOCK() rw_wlock(&audit_kinfo_lock)
#define KINFO_RUNLOCK() rw_runlock(&audit_kinfo_lock)
#define KINFO_WUNLOCK() rw_wunlock(&audit_kinfo_lock)
void
audit_set_kinfo(struct auditinfo_addr *ak)
{
KASSERT(ak->ai_termid.at_type == AU_IPv4 ||
ak->ai_termid.at_type == AU_IPv6,
("audit_set_kinfo: invalid address type"));
KINFO_WLOCK();
audit_kinfo = *ak;
KINFO_WUNLOCK();
}
void
audit_get_kinfo(struct auditinfo_addr *ak)
{
KASSERT(audit_kinfo.ai_termid.at_type == AU_IPv4 ||
audit_kinfo.ai_termid.at_type == AU_IPv6,
("audit_set_kinfo: invalid address type"));
KINFO_RLOCK();
*ak = audit_kinfo;
KINFO_RUNLOCK();
}
/*
* Construct an audit record for the passed thread.
*/
@ -241,7 +280,11 @@ audit_init(void)
audit_qctrl.aq_bufsz = AQ_BUFSZ;
audit_qctrl.aq_minfree = AU_FS_MINFREE;
audit_kinfo.ai_termid.at_type = AU_IPv4;
audit_kinfo.ai_termid.at_addr[0] = INADDR_ANY;
mtx_init(&audit_mtx, "audit_mtx", NULL, MTX_DEF);
KINFO_LOCK_INIT();
cv_init(&audit_worker_cv, "audit_worker_cv");
cv_init(&audit_watermark_cv, "audit_watermark_cv");
cv_init(&audit_fail_cv, "audit_fail_cv");

2
sys/security/audit/audit.h
View File

@ -180,6 +180,8 @@ void audit_cred_proc1(struct ucred *cred);
void audit_proc_coredump(struct thread *td, char *path, int errcode);
void audit_thread_alloc(struct thread *td);
void audit_thread_free(struct thread *td);
void audit_set_kinfo(struct auditinfo_addr *);
void audit_get_kinfo(struct auditinfo_addr *);
/*
* Define a macro to wrap the audit_arg_* calls by checking the global

25
sys/security/audit/audit_bsm.c
View File

@ -113,13 +113,34 @@ kau_close(struct au_record *rec, struct timespec *ctime, short event)
size_t tot_rec_size;
token_t *cur, *hdr, *trail;
struct timeval tm;
size_t hdrsize;
struct auditinfo_addr ak;
struct in6_addr *ap;
tot_rec_size = rec->len + AUDIT_HEADER_SIZE + AUDIT_TRAILER_SIZE;
audit_get_kinfo(&ak);
hdrsize = 0;
switch (ak.ai_termid.at_type) {
case AU_IPv4:
hdrsize = (ak.ai_termid.at_addr[0] == INADDR_ANY) ?
AUDIT_HEADER_SIZE : AUDIT_HEADER_EX_SIZE(&ak);
break;
case AU_IPv6:
ap = (struct in6_addr *)&ak.ai_termid.at_addr[0];
hdrsize = (IN6_IS_ADDR_UNSPECIFIED(ap)) ? AUDIT_HEADER_SIZE :
AUDIT_HEADER_EX_SIZE(&ak);
break;
default:
panic("kau_close: invalid address family");
}
tot_rec_size = rec->len + hdrsize + AUDIT_TRAILER_SIZE;
rec->data = malloc(tot_rec_size, M_AUDITBSM, M_WAITOK | M_ZERO);
tm.tv_usec = ctime->tv_nsec / 1000;
tm.tv_sec = ctime->tv_sec;
hdr = au_to_header32_tm(tot_rec_size, event, 0, tm);
if (hdrsize != AUDIT_HEADER_SIZE)
hdr = au_to_header32_ex_tm(tot_rec_size, event, 0, tm, &ak);
else
hdr = au_to_header32_tm(tot_rec_size, event, 0, tm);
TAILQ_INSERT_HEAD(&rec->token_q, hdr, tokens);
trail = au_to_trailer(tot_rec_size);

45
sys/security/audit/audit_bsm_token.c
View File

@ -1289,6 +1289,51 @@ au_to_exec_env(char **envp)
}
#endif
/*
* token ID 1 byte
* record byte count 4 bytes
* version # 1 byte
* event type 2 bytes
* event modifier 2 bytes
* address type/length 4 bytes
* machine address 4 bytes/16 bytes (IPv4/IPv6 address)
* seconds of time 4 bytes/8 bytes (32/64-bits)
* milliseconds of time 4 bytes/8 bytes (32/64-bits)
*/
token_t *
au_to_header32_ex_tm(int rec_size, au_event_t e_type, au_emod_t e_mod,
struct timeval tm, struct auditinfo_addr *aia)
{
token_t *t;
u_char *dptr = NULL;
u_int32_t timems;
struct au_tid_addr *tid;
tid = &aia->ai_termid;
KASSERT(tid->at_type == AU_IPv4 || tid->at_type == AU_IPv6,
("au_to_header32_ex_tm: invalid address family"));
GET_TOKEN_AREA(t, dptr, sizeof(u_char) + sizeof(u_int32_t) +
sizeof(u_char) + 2 * sizeof(u_int16_t) + 3 * sizeof(u_int32_t) +
tid->at_type);
ADD_U_CHAR(dptr, AUT_HEADER32_EX);
ADD_U_INT32(dptr, rec_size);
ADD_U_CHAR(dptr, AUDIT_HEADER_VERSION_OPENBSM);
ADD_U_INT16(dptr, e_type);
ADD_U_INT16(dptr, e_mod);
ADD_U_INT32(dptr, tid->at_type);
if (tid->at_type == AU_IPv6)
ADD_MEM(dptr, &tid->at_addr[0], 4 * sizeof(u_int32_t));
else
ADD_MEM(dptr, &tid->at_addr[0], sizeof(u_int32_t));
timems = tm.tv_usec / 1000;
/* Add the timestamp */
ADD_U_INT32(dptr, tm.tv_sec);
ADD_U_INT32(dptr, timems); /* We need time in ms. */
return (t);
}
/*
* token ID 1 byte
* record byte count 4 bytes

1
sys/security/audit/audit_private.h
View File

@ -132,6 +132,7 @@ union auditon_udata {
au_qctrl_t au_qctrl;
au_stat_t au_stat;
au_fstat_t au_fstat;
auditinfo_addr_t au_kau_info;
};
struct posix_ipc_perm {

7
sys/security/audit/audit_syscalls.c
View File

@ -395,11 +395,14 @@ auditon(struct thread *td, struct auditon_args *uap)
break;
case A_GETKAUDIT:
return (ENOSYS);
audit_get_kinfo(&udata.au_kau_info);
break;
case A_SETKAUDIT:
return (ENOSYS);
if (udata.au_kau_info.ai_termid.at_type != AU_IPv4 &&
udata.au_kau_info.ai_termid.at_type != AU_IPv6)
return (EINVAL);
audit_set_kinfo(&udata.au_kau_info);
break;
case A_SENDTRIGGER: