#include <sys/param.h>
#include <sys/systm.h>
#include <sys/types.h>
#include <sys/proc_internal.h>
#include <sys/kauth.h>
#include <sys/file_internal.h>
#include <sys/namei.h>
#include <sys/vnode_internal.h>
#if KTRACE
#include <sys/ktrace.h>
#endif
#include <sys/malloc.h>
#include <sys/syslog.h>
#include <sys/sysproto.h>
#include <sys/uio_internal.h>
#include <bsm/audit_kernel.h>
#if KTRACE
static struct ktr_header *ktrgetheader(int type);
static void ktrwrite(struct vnode *, struct ktr_header *, struct uio *);
static int ktrcanset(struct proc *,struct proc *);
static int ktrsetchildren(struct proc *,struct proc *,
int, int, struct vnode *);
static int ktrops(struct proc *,struct proc *,int,int,struct vnode *);
static struct ktr_header *
ktrgetheader(type)
int type;
{
register struct ktr_header *kth;
struct proc *p = current_proc();
MALLOC(kth, struct ktr_header *, sizeof (struct ktr_header),
M_KTRACE, M_WAITOK);
if (kth != NULL) {
kth->ktr_type = type;
microtime(&kth->ktr_time);
kth->ktr_pid = p->p_pid;
bcopy(p->p_comm, kth->ktr_comm, MAXCOMLEN);
}
return (kth);
}
#endif
void
ktrsyscall(p, code, narg, args)
struct proc *p;
int code, narg;
u_int64_t args[];
{
#if KTRACE
struct vnode *vp;
struct ktr_header *kth;
struct ktr_syscall *ktp;
register int len;
u_int64_t *argp;
int i;
if (!KTRPOINT(p, KTR_SYSCALL))
return;
vp = p->p_tracep;
len = __offsetof(struct ktr_syscall, ktr_args) +
(narg * sizeof(u_int64_t));
p->p_traceflag |= KTRFAC_ACTIVE;
kth = ktrgetheader(KTR_SYSCALL);
if (kth == NULL) {
p->p_traceflag &= ~KTRFAC_ACTIVE;
return;
}
MALLOC(ktp, struct ktr_syscall *, len, M_KTRACE, M_WAITOK);
if (ktp == NULL) {
FREE(kth, M_KTRACE);
return;
}
ktp->ktr_code = code;
ktp->ktr_narg = narg;
argp = &ktp->ktr_args[0];
for (i = 0; i < narg; i++)
*argp++ = args[i];
kth->ktr_buf = (caddr_t)ktp;
kth->ktr_len = len;
ktrwrite(vp, kth, NULL);
FREE(ktp, M_KTRACE);
FREE(kth, M_KTRACE);
p->p_traceflag &= ~KTRFAC_ACTIVE;
#else
return;
#endif
}
void
ktrsysret(p, code, error, retval)
struct proc *p;
int code, error;
register_t retval;
{
#if KTRACE
struct vnode *vp;
struct ktr_header *kth;
struct ktr_sysret ktp;
if (!KTRPOINT(p, KTR_SYSRET))
return;
vp = p->p_tracep;
p->p_traceflag |= KTRFAC_ACTIVE;
kth = ktrgetheader(KTR_SYSRET);
if (kth == NULL) {
p->p_traceflag &= ~KTRFAC_ACTIVE;
return;
}
ktp.ktr_code = code;
ktp.ktr_error = error;
ktp.ktr_retval = retval;
kth->ktr_buf = (caddr_t)&ktp;
kth->ktr_len = sizeof(struct ktr_sysret);
ktrwrite(vp, kth, NULL);
FREE(kth, M_KTRACE);
p->p_traceflag &= ~KTRFAC_ACTIVE;
#else
return;
#endif
}
#if KTRACE
void
ktrnamei(vp, path)
struct vnode *vp;
char *path;
{
struct ktr_header *kth;
struct proc *p = current_proc();
p->p_traceflag |= KTRFAC_ACTIVE;
kth = ktrgetheader(KTR_NAMEI);
if (kth == NULL) {
p->p_traceflag &= ~KTRFAC_ACTIVE;
return;
}
kth->ktr_len = strlen(path);
kth->ktr_buf = path;
ktrwrite(vp, kth, NULL);
FREE(kth, M_KTRACE);
p->p_traceflag &= ~KTRFAC_ACTIVE;
}
void
ktrgenio(vp, fd, rw, uio, error)
struct vnode *vp;
int fd;
enum uio_rw rw;
struct uio *uio;
int error;
{
struct ktr_header *kth;
struct ktr_genio ktg;
struct proc *p = current_proc();
if (error)
return;
p->p_traceflag |= KTRFAC_ACTIVE;
kth = ktrgetheader(KTR_GENIO);
if (kth == NULL) {
p->p_traceflag &= ~KTRFAC_ACTIVE;
return;
}
ktg.ktr_fd = fd;
ktg.ktr_rw = rw;
kth->ktr_buf = (caddr_t)&ktg;
kth->ktr_len = sizeof(struct ktr_genio);
uio->uio_offset = 0;
uio->uio_rw = UIO_WRITE;
ktrwrite(vp, kth, uio);
FREE(kth, M_KTRACE);
p->p_traceflag &= ~KTRFAC_ACTIVE;
}
void
ktrpsig(vp, sig, action, mask, code)
struct vnode *vp;
int sig;
sig_t action;
sigset_t *mask;
int code;
{
struct ktr_header *kth;
struct ktr_psig kp;
struct proc *p = current_proc();
p->p_traceflag |= KTRFAC_ACTIVE;
kth = ktrgetheader(KTR_PSIG);
if (kth == NULL) {
p->p_traceflag &= ~KTRFAC_ACTIVE;
return;
}
kp.signo = (char)sig;
kp.action = action;
kp.mask = *mask;
kp.code = code;
kth->ktr_buf = (caddr_t)&kp;
kth->ktr_len = sizeof (struct ktr_psig);
ktrwrite(vp, kth, NULL);
FREE(kth, M_KTRACE);
p->p_traceflag &= ~KTRFAC_ACTIVE;
}
void
ktrcsw(vp, out, user)
struct vnode *vp;
int out, user;
{
struct ktr_header *kth;
struct ktr_csw kc;
struct proc *p = current_proc();
p->p_traceflag |= KTRFAC_ACTIVE;
kth = ktrgetheader(KTR_CSW);
if (kth == NULL) {
p->p_traceflag &= ~KTRFAC_ACTIVE;
return;
}
kc.out = out;
kc.user = user;
kth->ktr_buf = (caddr_t)&kc;
kth->ktr_len = sizeof (struct ktr_csw);
ktrwrite(vp, kth, NULL);
FREE(kth, M_KTRACE);
p->p_traceflag &= ~KTRFAC_ACTIVE;
}
#endif
int
ktrace(struct proc *curp, register struct ktrace_args *uap, __unused register_t *retval)
{
#if KTRACE
register struct vnode *vp = NULL;
register struct proc *p;
struct pgrp *pg;
int facs = uap->facs & ~KTRFAC_ROOT;
int ops = KTROP(uap->ops);
int descend = uap->ops & KTRFLAG_DESCEND;
int ret = 0;
int error = 0;
struct nameidata nd;
struct vfs_context context;
AUDIT_ARG(cmd, uap->ops);
AUDIT_ARG(pid, uap->pid);
AUDIT_ARG(value, uap->facs);
context.vc_proc = curp;
context.vc_ucred = kauth_cred_get();
curp->p_traceflag |= KTRFAC_ACTIVE;
if (ops != KTROP_CLEAR) {
NDINIT(&nd, LOOKUP, (NOFOLLOW|LOCKLEAF), UIO_USERSPACE,
uap->fname, &context);
error = vn_open(&nd, FREAD|FWRITE|O_NOFOLLOW, 0);
if (error) {
curp->p_traceflag &= ~KTRFAC_ACTIVE;
return (error);
}
vp = nd.ni_vp;
if (vp->v_type != VREG) {
(void) vn_close(vp, FREAD|FWRITE, kauth_cred_get(), curp);
(void) vnode_put(vp);
curp->p_traceflag &= ~KTRFAC_ACTIVE;
return (EACCES);
}
}
if (ops == KTROP_CLEARFILE) {
LIST_FOREACH(p, &allproc, p_list) {
if (p->p_tracep == vp) {
if (ktrcanset(curp, p)) {
struct vnode *tvp = p->p_tracep;
p->p_traceflag = 0;
if (tvp != NULL) {
p->p_tracep = NULL;
vnode_rele(tvp);
}
} else
error = EPERM;
}
}
goto done;
}
if (!facs) {
error = EINVAL;
goto done;
}
if (uap->pid < 0) {
pg = pgfind(-uap->pid);
if (pg == NULL) {
error = ESRCH;
goto done;
}
LIST_FOREACH(p, &pg->pg_members, p_pglist)
if (descend)
ret |= ktrsetchildren(curp, p, ops, facs, vp);
else
ret |= ktrops(curp, p, ops, facs, vp);
} else {
p = pfind(uap->pid);
if (p == NULL) {
error = ESRCH;
goto done;
}
AUDIT_ARG(process, p);
if (descend)
ret |= ktrsetchildren(curp, p, ops, facs, vp);
else
ret |= ktrops(curp, p, ops, facs, vp);
}
if (!ret)
error = EPERM;
done:
if (vp != NULL) {
(void) vn_close(vp, FWRITE, kauth_cred_get(), curp);
(void) vnode_put(vp);
}
curp->p_traceflag &= ~KTRFAC_ACTIVE;
return (error);
#else
return ENOSYS;
#endif
}
int
utrace(__unused struct proc *curp, register struct utrace_args *uap, __unused register_t *retval)
{
#if KTRACE
struct ktr_header *kth;
struct proc *p = current_proc();
register caddr_t cp;
if (!KTRPOINT(p, KTR_USER))
return (0);
if (uap->len > KTR_USER_MAXLEN)
return (EINVAL);
p->p_traceflag |= KTRFAC_ACTIVE;
kth = ktrgetheader(KTR_USER);
if (kth == NULL) {
p->p_traceflag &= ~KTRFAC_ACTIVE;
return(ENOMEM);
}
MALLOC(cp, caddr_t, uap->len, M_KTRACE, M_WAITOK);
if (cp == NULL) {
FREE(kth, M_KTRACE);
return(ENOMEM);
}
if (copyin(uap->addr, cp, uap->len) == 0) {
kth->ktr_buf = cp;
kth->ktr_len = uap->len;
ktrwrite(p->p_tracep, kth, NULL);
}
FREE(kth, M_KTRACE);
FREE(cp, M_KTRACE);
p->p_traceflag &= ~KTRFAC_ACTIVE;
return (0);
#else
return (ENOSYS);
#endif
}
#if KTRACE
static int
ktrops(curp, p, ops, facs, vp)
struct proc *p, *curp;
int ops, facs;
struct vnode *vp;
{
struct vnode *tvp;
if (!ktrcanset(curp, p))
return (0);
if (ops == KTROP_SET) {
if (p->p_tracep != vp) {
tvp = p->p_tracep;
vnode_ref(vp);
p->p_tracep = vp;
if (tvp != NULL) {
vnode_rele(tvp);
}
}
p->p_traceflag |= facs;
if (!suser(kauth_cred_get(), NULL))
p->p_traceflag |= KTRFAC_ROOT;
} else {
if (((p->p_traceflag &= ~facs) & KTRFAC_MASK) == 0) {
tvp = p->p_tracep;
p->p_traceflag = 0;
if (tvp != NULL) {
p->p_tracep = NULL;
vnode_rele(tvp);
}
}
}
return (1);
}
static int
ktrsetchildren(curp, top, ops, facs, vp)
struct proc *curp, *top;
int ops, facs;
struct vnode *vp;
{
register struct proc *p;
register int ret = 0;
p = top;
for (;;) {
ret |= ktrops(curp, p, ops, facs, vp);
if (!LIST_EMPTY(&p->p_children))
p = LIST_FIRST(&p->p_children);
else for (;;) {
if (p == top)
return (ret);
if (LIST_NEXT(p, p_sibling)) {
p = LIST_NEXT(p, p_sibling);
break;
}
p = p->p_pptr;
}
}
}
static void
ktrwrite(struct vnode *vp, struct ktr_header *kth, struct uio *uio)
{
uio_t auio;
register struct proc *p = current_proc();
struct vfs_context context;
int error;
char uio_buf[ UIO_SIZEOF(2) ];
if (vp == NULL)
return;
auio = uio_createwithbuffer(2, 0, UIO_SYSSPACE, UIO_WRITE,
&uio_buf[0], sizeof(uio_buf));
uio_addiov(auio, CAST_USER_ADDR_T(kth), sizeof(struct ktr_header));
context.vc_proc = p;
context.vc_ucred = kauth_cred_get();
if (kth->ktr_len > 0) {
uio_addiov(auio, CAST_USER_ADDR_T(kth->ktr_buf), kth->ktr_len);
if (uio != NULL)
kth->ktr_len += uio_resid(uio);
}
if ((error = vnode_getwithref(vp)) == 0) {
error = VNOP_WRITE(vp, auio, IO_UNIT | IO_APPEND, &context);
if (error == 0 && uio != NULL) {
error = VNOP_WRITE(vp, uio, IO_UNIT | IO_APPEND, &context);
}
vnode_put(vp);
}
if (error) {
log(LOG_NOTICE, "ktrace write failed, errno %d, tracing stopped\n",
error);
LIST_FOREACH(p, &allproc, p_list) {
if (p->p_tracep == vp) {
p->p_tracep = NULL;
p->p_traceflag = 0;
vnode_rele(vp);
}
}
}
}
static int
ktrcanset(__unused struct proc *callp, struct proc *targetp)
{
kauth_cred_t caller = kauth_cred_get();
kauth_cred_t target = targetp->p_ucred;
#if 0
if (!PRISON_CHECK(callp, targetp))
return (0);
#endif
if ((kauth_cred_getuid(caller) == target->cr_ruid &&
target->cr_ruid == target->cr_svuid &&
caller->cr_rgid == target->cr_rgid &&
target->cr_rgid == target->cr_svgid &&
(targetp->p_traceflag & KTRFAC_ROOT) == 0 &&
(targetp->p_flag & P_SUGID) == 0) ||
!suser(caller, NULL))
return (1);
return (0);
}
#endif