[unix-history] / sys / kern / kern_prot.c

/*
 * Copyright (c) 1982, 1986, 1989, 1990, 1991 Regents of the University
 * of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	from: @(#)kern_prot.c	7.21 (Berkeley) 5/3/91
 *	$Id: kern_prot.c,v 1.4 1993/11/25 01:33:04 wollman Exp $
 */

/*
 * System calls related to processes and protection
 */

#include "param.h"
#include "systm.h"
#include "acct.h"
#include "ucred.h"
#include "proc.h"
#include "timeb.h"
#include "times.h"
#include "malloc.h"

/* ARGSUSED */
int
getpid(p, uap, retval)
	struct proc *p;
	void *uap;
	int *retval;
{

	*retval = p->p_pid;
#ifdef COMPAT_43
	retval[1] = p->p_pptr->p_pid;
#endif
	return (0);
}

/* ARGSUSED */
int
getppid(p, uap, retval)
	struct proc *p;
	void *uap;
	int *retval;
{

	*retval = p->p_pptr->p_pid;
	return (0);
}

/* Get process group ID; note that POSIX getpgrp takes no parameter */
int
getpgrp(p, uap, retval)
	struct proc *p;
	void *uap;
	int *retval;
{

	*retval = p->p_pgrp->pg_id;
	return (0);
}

/* ARGSUSED */
int
getuid(p, uap, retval)
	struct proc *p;
	void *uap;
	int *retval;
{

	*retval = p->p_cred->p_ruid;
#ifdef COMPAT_43
	retval[1] = p->p_ucred->cr_uid;
#endif
	return (0);
}

/* ARGSUSED */
int
geteuid(p, uap, retval)
	struct proc *p;
	void *uap;
	int *retval;
{

	*retval = p->p_ucred->cr_uid;
	return (0);
}

/* ARGSUSED */
int
getgid(p, uap, retval)
	struct proc *p;
	void *uap;
	int *retval;
{

	*retval = p->p_cred->p_rgid;
#ifdef COMPAT_43
	retval[1] = p->p_ucred->cr_groups[0];
#endif
	return (0);
}

/*
 * Get effective group ID.  The "egid" is groups[0], and could be obtained
 * via getgroups.  This syscall exists because it is somewhat painful to do
 * correctly in a library function.
 */
/* ARGSUSED */
int
getegid(p, uap, retval)
	struct proc *p;
	void *uap;
	int *retval;
{

	*retval = p->p_ucred->cr_groups[0];
	return (0);
}

struct getgroups_args {
	u_int	gidsetsize;
	int	*gidset;		/* XXX not yet POSIX */
};

int
getgroups(p, uap, retval)
	struct proc *p;
	register struct getgroups_args *uap;
	int *retval;
{
	register struct pcred *pc = p->p_cred;
	register gid_t *gp;
	register int *lp;
	register u_int ngrp;
	int groups[NGROUPS];
	int error;

	if ((ngrp = uap->gidsetsize) == 0) {
		*retval = pc->pc_ucred->cr_ngroups;
		return (0);
	}
	if (ngrp < pc->pc_ucred->cr_ngroups)
		return (EINVAL);
	ngrp = pc->pc_ucred->cr_ngroups;
	for (gp = pc->pc_ucred->cr_groups, lp = groups; lp < &groups[ngrp]; )
		*lp++ = *gp++;
	if (error = copyout((caddr_t)groups, (caddr_t)uap->gidset,
	    ngrp * sizeof (groups[0])))
		return (error);
	*retval = ngrp;
	return (0);
}

/* ARGSUSED */
int
setsid(p, uap, retval)
	register struct proc *p;
	void *uap;
	int *retval;
{

	if (p->p_pgid == p->p_pid || pgfind(p->p_pid)) {
		return (EPERM);
	} else {
		enterpgrp(p, p->p_pid, 1);
		*retval = p->p_pid;
		return (0);
	}
}

/*
 * set process group (setpgid/old setpgrp)
 *
 * caller does setpgid(targpid, targpgid)
 *
 * pid must be caller or child of caller (ESRCH)
 * if a child
 *	pid must be in same session (EPERM)
 *	pid can't have done an exec (EACCES)
 * if pgid != pid
 * 	there must exist some pid in same session having pgid (EPERM)
 * pid must not be session leader (EPERM)
 */

struct setpgid_args {
	int	pid;	/* target process id */
	int	pgid;	/* target pgrp id */
};

/* ARGSUSED */
int
setpgid(curp, uap, retval)
	struct proc *curp;
	register struct setpgid_args *uap;
	int *retval;
{
	register struct proc *targp;		/* target process */
	register struct pgrp *pgrp;		/* target pgrp */

	if (uap->pid != 0 && uap->pid != curp->p_pid) {
		if ((targp = pfind(uap->pid)) == 0 || !inferior(targp))
			return (ESRCH);
		if (targp->p_session != curp->p_session)
			return (EPERM);
		if (targp->p_flag&SEXEC)
			return (EACCES);
	} else
		targp = curp;
	if (SESS_LEADER(targp))
		return (EPERM);
	if (uap->pgid == 0)
		uap->pgid = targp->p_pid;
	else if (uap->pgid != targp->p_pid)
		if ((pgrp = pgfind(uap->pgid)) == 0 ||
	            pgrp->pg_session != curp->p_session)
			return (EPERM);
	enterpgrp(targp, uap->pgid, 0);
	return (0);
}

struct setuid_args {
	int	uid;
};

/* ARGSUSED */
int
setuid(p, uap, retval)
	struct proc *p;
	struct setuid_args *uap;
	int *retval;
{
	register struct pcred *pc = p->p_cred;
	register uid_t uid;
	int error;

	uid = uap->uid;
	if (uid != pc->p_ruid &&
	    (error = suser(pc->pc_ucred, &p->p_acflag)))
		return (error);
	/*
	 * Everything's okay, do it.  Copy credentials so other references do
	 * not see our changes.
	 */
	pc->pc_ucred = crcopy(pc->pc_ucred);
	pc->pc_ucred->cr_uid = uid;
	pc->p_ruid = uid;
	pc->p_svuid = uid;
	return (0);
}

struct seteuid_args {
	int	euid;
};

/* ARGSUSED */
int
seteuid(p, uap, retval)
	struct proc *p;
	struct seteuid_args *uap;
	int *retval;
{
	register struct pcred *pc = p->p_cred;
	register uid_t euid;
	int error;

	euid = uap->euid;
	if (euid != pc->p_ruid && euid != pc->p_svuid &&
	    (error = suser(pc->pc_ucred, &p->p_acflag)))
		return (error);
	/*
	 * Everything's okay, do it.  Copy credentials so other references do
	 * not see our changes.
	 */
	pc->pc_ucred = crcopy(pc->pc_ucred);
	pc->pc_ucred->cr_uid = euid;
	return (0);
}

struct setgid_args {
	int	gid;
};

/* ARGSUSED */
int
setgid(p, uap, retval)
	struct proc *p;
	struct setgid_args *uap;
	int *retval;
{
	register struct pcred *pc = p->p_cred;
	register gid_t gid;
	int error;

	gid = uap->gid;
	if (gid != pc->p_rgid && (error = suser(pc->pc_ucred, &p->p_acflag)))
		return (error);
	pc->pc_ucred = crcopy(pc->pc_ucred);
	pc->pc_ucred->cr_groups[0] = gid;
	pc->p_rgid = gid;
	pc->p_svgid = gid;		/* ??? */
	return (0);
}

struct setegid_args {
	int	egid;
};

/* ARGSUSED */
int
setegid(p, uap, retval)
	struct proc *p;
	struct setegid_args *uap;
	int *retval;
{
	register struct pcred *pc = p->p_cred;
	register gid_t egid;
	int error;

	egid = uap->egid;
	if (egid != pc->p_rgid && egid != pc->p_svgid &&
	    (error = suser(pc->pc_ucred, &p->p_acflag)))
		return (error);
	pc->pc_ucred = crcopy(pc->pc_ucred);
	pc->pc_ucred->cr_groups[0] = egid;
	return (0);
}

#ifdef COMPAT_43

struct osetreuid_args {
	int	ruid;
	int	euid;
};

/* ARGSUSED */
int
osetreuid(p, uap, retval)
	register struct proc *p;
	struct osetreuid_args *uap;
	int *retval;
{
	register struct pcred *pc = p->p_cred;
	register uid_t ruid, euid;
	int error;

	if (uap->ruid == -1)
		ruid = pc->p_ruid;
	else
		ruid = uap->ruid;
	/*
	 * Allow setting real uid to previous effective, for swapping real and
	 * effective.  This should be:
	 *
	 * if (ruid != pc->p_ruid &&
	 *     (error = suser(pc->pc_ucred, &p->p_acflag)))
	 */
	if (ruid != pc->p_ruid && ruid != pc->pc_ucred->cr_uid /* XXX */ &&
	    (error = suser(pc->pc_ucred, &p->p_acflag)))
		return (error);
	if (uap->euid == -1)
		euid = pc->pc_ucred->cr_uid;
	else
		euid = uap->euid;
	if (euid != pc->pc_ucred->cr_uid && euid != pc->p_ruid &&
	    euid != pc->p_svuid && (error = suser(pc->pc_ucred, &p->p_acflag)))
		return (error);
	/*
	 * Everything's okay, do it.  Copy credentials so other references do
	 * not see our changes.
	 */
	pc->pc_ucred = crcopy(pc->pc_ucred);
	pc->pc_ucred->cr_uid = euid;
	pc->p_ruid = ruid;
	return (0);
}

struct osetregid_args {
	int	rgid;
	int	egid;
};

/* ARGSUSED */
int
osetregid(p, uap, retval)
	register struct proc *p;
	struct osetregid_args *uap;
	int *retval;
{
	register struct pcred *pc = p->p_cred;
	register gid_t rgid, egid;
	int error;

	if (uap->rgid == -1)
		rgid = pc->p_rgid;
	else
		rgid = uap->rgid;
	/*
	 * Allow setting real gid to previous effective, for swapping real and
	 * effective.  This didn't really work correctly in 4.[23], but is
	 * preserved so old stuff doesn't fail.  This should be:
	 *
	 * if (rgid != pc->p_rgid &&
	 *     (error = suser(pc->pc_ucred, &p->p_acflag)))
	 */
	if (rgid != pc->p_rgid && rgid != pc->pc_ucred->cr_groups[0] /* XXX */ &&
	    (error = suser(pc->pc_ucred, &p->p_acflag)))
		return (error);
	if (uap->egid == -1)
		egid = pc->pc_ucred->cr_groups[0];
	else
		egid = uap->egid;
	if (egid != pc->pc_ucred->cr_groups[0] && egid != pc->p_rgid &&
	    egid != pc->p_svgid && (error = suser(pc->pc_ucred, &p->p_acflag)))
		return (error);
	pc->pc_ucred = crcopy(pc->pc_ucred);
	pc->pc_ucred->cr_groups[0] = egid;
	pc->p_rgid = rgid;
	return (0);
}
#endif

struct setgroups_args {
	u_int	gidsetsize;
	int	*gidset;
};

/* ARGSUSED */
int
setgroups(p, uap, retval)
	struct proc *p;
	struct setgroups_args *uap;
	int *retval;
{
	register struct pcred *pc = p->p_cred;
	register gid_t *gp;
	register u_int ngrp;
	register int *lp;
	int error, groups[NGROUPS];

	if (error = suser(pc->pc_ucred, &p->p_acflag))
		return (error);
	if ((ngrp = uap->gidsetsize) > NGROUPS)
		return (EINVAL);
	if (error = copyin((caddr_t)uap->gidset, (caddr_t)groups,
	    ngrp * sizeof (groups[0])))
		return (error);
	pc->pc_ucred = crcopy(pc->pc_ucred);
	pc->pc_ucred->cr_ngroups = ngrp;
	/* convert from int's to gid_t's */
	for (gp = pc->pc_ucred->cr_groups, lp = groups; ngrp--; )
		*gp++ = *lp++;
	return (0);
}

/*
 * Check if gid is a member of the group set.
 */
int
groupmember(gid, cred)
	gid_t gid;
	register struct ucred *cred;
{
	register gid_t *gp;
	gid_t *egp;

	egp = &(cred->cr_groups[cred->cr_ngroups]);
	for (gp = cred->cr_groups; gp < egp; gp++)
		if (*gp == gid)
			return (1);
	return (0);
}

/*
 * Test whether the specified credentials imply "super-user"
 * privilege; if so, and we have accounting info, set the flag
 * indicating use of super-powers.
 * Returns 0 or error.
 */
int
suser(cred, acflag)
	struct ucred *cred;
	u_short *acflag;
{
	if (cred->cr_uid == 0) {
		if (acflag)
			*acflag |= ASU;
		return (0);
	}
	return (EPERM);
}

/*
 * Allocate a zeroed cred structure.
 */
struct ucred *
crget()
{
	register struct ucred *cr;

	MALLOC(cr, struct ucred *, sizeof(*cr), M_CRED, M_WAITOK);
	bzero((caddr_t)cr, sizeof(*cr));
	cr->cr_ref = 1;
	return (cr);
}

/*
 * Free a cred structure.
 * Throws away space when ref count gets to 0.
 */
void
crfree(cr)
	struct ucred *cr;
{
	int s = splimp();			/* ??? XXX FIXME */

	if (--cr->cr_ref != 0) {
		(void) splx(s);
		return;
	}
	FREE((caddr_t)cr, M_CRED);
	(void) splx(s);
}

/*
 * Copy cred structure to a new one and free the old one.
 */
struct ucred *
crcopy(cr)
	struct ucred *cr;
{
	struct ucred *newcr;

	if (cr->cr_ref == 1)
		return (cr);
	newcr = crget();
	*newcr = *cr;
	crfree(cr);
	newcr->cr_ref = 1;
	return (newcr);
}

/*
 * Dup cred struct to a new held one.
 */
struct ucred *
crdup(cr)
	struct ucred *cr;
{
	struct ucred *newcr;

	newcr = crget();
	*newcr = *cr;
	newcr->cr_ref = 1;
	return (newcr);
}

/*
 * Get login name, if available.
 */

struct getlogin_args {
	char	*namebuf;
	u_int	namelen;
};

/* ARGSUSED */
int
getlogin(p, uap, retval)
	struct proc *p;
	struct getlogin_args *uap;
	int *retval;
{

	if (uap->namelen > sizeof (p->p_pgrp->pg_session->s_login))
		uap->namelen = sizeof (p->p_pgrp->pg_session->s_login);
	return (copyout((caddr_t) p->p_pgrp->pg_session->s_login,
	    (caddr_t) uap->namebuf, uap->namelen));
}

/*
 * Set login name.
 */

struct setlogin_args {
	char	*namebuf;
};

/* ARGSUSED */
int
setlogin(p, uap, retval)
	struct proc *p;
	struct setlogin_args *uap;
	int *retval;
{
	int error;

	if (error = suser(p->p_ucred, &p->p_acflag))
		return (error);
	error = copyinstr((caddr_t) uap->namebuf,
	    (caddr_t) p->p_pgrp->pg_session->s_login,
	    sizeof (p->p_pgrp->pg_session->s_login) - 1, (u_int *)0);
	if (error == ENAMETOOLONG)
		error = EINVAL;
	return (error);
}
Commit	Line	Data
15637ed4 RG	1	/*
	2	* Copyright (c) 1982, 1986, 1989, 1990, 1991 Regents of the University
	3	* of California. All rights reserved.
	4	*
	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	8	* 1. Redistributions of source code must retain the above copyright
	9	* notice, this list of conditions and the following disclaimer.
	10	* 2. Redistributions in binary form must reproduce the above copyright
	11	* notice, this list of conditions and the following disclaimer in the
	12	* documentation and/or other materials provided with the distribution.
	13	* 3. All advertising materials mentioning features or use of this software
	14	* must display the following acknowledgement:
	15	* This product includes software developed by the University of
	16	* California, Berkeley and its contributors.
	17	* 4. Neither the name of the University nor the names of its contributors
	18	* may be used to endorse or promote products derived from this software
	19	* without specific prior written permission.
	20	*
	21	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	22	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	23	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	24	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	25	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	26	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	27	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	28	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	29	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	30	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	31	* SUCH DAMAGE.
	32	*
600f7f07	33	* from: @(#)kern_prot.c 7.21 (Berkeley) 5/3/91
fde1aeb2	34	* $Id: kern_prot.c,v 1.4 1993/11/25 01:33:04 wollman Exp $
15637ed4 RG	35	*/
	36
	37	/*
	38	* System calls related to processes and protection
	39	*/
	40
	41	#include "param.h"
15637ed4	42	#include "systm.h"
fde1aeb2	43	#include "acct.h"
15637ed4 RG	44	#include "ucred.h"
	45	#include "proc.h"
	46	#include "timeb.h"
	47	#include "times.h"
	48	#include "malloc.h"
	49
	50	/* ARGSUSED */
4c45483e	51	int
15637ed4 RG	52	getpid(p, uap, retval)
	53	struct proc *p;
	54	void *uap;
	55	int *retval;
	56	{
	57
	58	*retval = p->p_pid;
	59	#ifdef COMPAT_43
	60	retval[1] = p->p_pptr->p_pid;
	61	#endif
	62	return (0);
	63	}
	64
	65	/* ARGSUSED */
4c45483e	66	int
15637ed4 RG	67	getppid(p, uap, retval)
	68	struct proc *p;
	69	void *uap;
	70	int *retval;
	71	{
	72
	73	*retval = p->p_pptr->p_pid;
	74	return (0);
	75	}
	76
	77	/* Get process group ID; note that POSIX getpgrp takes no parameter */
4c45483e	78	int
15637ed4 RG	79	getpgrp(p, uap, retval)
	80	struct proc *p;
	81	void *uap;
	82	int *retval;
	83	{
	84
	85	*retval = p->p_pgrp->pg_id;
	86	return (0);
	87	}
	88
	89	/* ARGSUSED */
4c45483e	90	int
15637ed4 RG	91	getuid(p, uap, retval)
	92	struct proc *p;
	93	void *uap;
	94	int *retval;
	95	{
	96
	97	*retval = p->p_cred->p_ruid;
	98	#ifdef COMPAT_43
	99	retval[1] = p->p_ucred->cr_uid;
	100	#endif
	101	return (0);
	102	}
	103
	104	/* ARGSUSED */
4c45483e	105	int
15637ed4 RG	106	geteuid(p, uap, retval)
	107	struct proc *p;
	108	void *uap;
	109	int *retval;
	110	{
	111
	112	*retval = p->p_ucred->cr_uid;
	113	return (0);
	114	}
	115
	116	/* ARGSUSED */
4c45483e	117	int
15637ed4 RG	118	getgid(p, uap, retval)
	119	struct proc *p;
	120	void *uap;
	121	int *retval;
	122	{
	123
	124	*retval = p->p_cred->p_rgid;
	125	#ifdef COMPAT_43
	126	retval[1] = p->p_ucred->cr_groups[0];
	127	#endif
	128	return (0);
	129	}
	130
	131	/*
	132	* Get effective group ID. The "egid" is groups[0], and could be obtained
	133	* via getgroups. This syscall exists because it is somewhat painful to do
	134	* correctly in a library function.
	135	*/
	136	/* ARGSUSED */
4c45483e	137	int
15637ed4 RG	138	getegid(p, uap, retval)
	139	struct proc *p;
	140	void *uap;
	141	int *retval;
	142	{
	143
	144	*retval = p->p_ucred->cr_groups[0];
	145	return (0);
	146	}
	147
3c7eb27c DG	148	struct getgroups_args {
	149	u_int gidsetsize;
	150	int gidset; / XXX not yet POSIX */
	151	};
	152
4c45483e	153	int
15637ed4 RG	154	getgroups(p, uap, retval)
15637ed4 RG	155	struct proc *p;
3c7eb27c	156	register struct getgroups_args *uap;
15637ed4 RG	157	int *retval;
	158	{
	159	register struct pcred *pc = p->p_cred;
	160	register gid_t *gp;
	161	register int *lp;
	162	register u_int ngrp;
	163	int groups[NGROUPS];
	164	int error;
	165
	166	if ((ngrp = uap->gidsetsize) == 0) {
	167	*retval = pc->pc_ucred->cr_ngroups;
	168	return (0);
	169	}
	170	if (ngrp < pc->pc_ucred->cr_ngroups)
	171	return (EINVAL);
	172	ngrp = pc->pc_ucred->cr_ngroups;
	173	for (gp = pc->pc_ucred->cr_groups, lp = groups; lp < &groups[ngrp]; )
	174	lp++ = gp++;
	175	if (error = copyout((caddr_t)groups, (caddr_t)uap->gidset,
	176	ngrp * sizeof (groups[0])))
	177	return (error);
	178	*retval = ngrp;
	179	return (0);
	180	}
	181
	182	/* ARGSUSED */
4c45483e	183	int
15637ed4 RG	184	setsid(p, uap, retval)
	185	register struct proc *p;
	186	void *uap;
	187	int *retval;
	188	{
	189
	190	if (p->p_pgid == p->p_pid \|\| pgfind(p->p_pid)) {
	191	return (EPERM);
	192	} else {
	193	enterpgrp(p, p->p_pid, 1);
	194	*retval = p->p_pid;
	195	return (0);
	196	}
	197	}
	198
	199	/*
	200	* set process group (setpgid/old setpgrp)
	201	*
	202	* caller does setpgid(targpid, targpgid)
	203	*
	204	* pid must be caller or child of caller (ESRCH)
	205	* if a child
	206	* pid must be in same session (EPERM)
	207	* pid can't have done an exec (EACCES)
	208	* if pgid != pid
	209	* there must exist some pid in same session having pgid (EPERM)
	210	* pid must not be session leader (EPERM)
	211	*/
3c7eb27c DG	212
	213	struct setpgid_args {
	214	int pid; /* target process id */
	215	int pgid; /* target pgrp id */
	216	};
	217
15637ed4	218	/* ARGSUSED */
4c45483e	219	int
15637ed4 RG	220	setpgid(curp, uap, retval)
15637ed4 RG	221	struct proc *curp;
3c7eb27c	222	register struct setpgid_args *uap;
15637ed4 RG	223	int *retval;
	224	{
	225	register struct proc targp; / target process */
	226	register struct pgrp pgrp; / target pgrp */
	227
	228	if (uap->pid != 0 && uap->pid != curp->p_pid) {
	229	if ((targp = pfind(uap->pid)) == 0 \|\| !inferior(targp))
	230	return (ESRCH);
	231	if (targp->p_session != curp->p_session)
	232	return (EPERM);
	233	if (targp->p_flag&SEXEC)
	234	return (EACCES);
	235	} else
	236	targp = curp;
	237	if (SESS_LEADER(targp))
	238	return (EPERM);
	239	if (uap->pgid == 0)
	240	uap->pgid = targp->p_pid;
	241	else if (uap->pgid != targp->p_pid)
	242	if ((pgrp = pgfind(uap->pgid)) == 0 \|\|
	243	pgrp->pg_session != curp->p_session)
	244	return (EPERM);
	245	enterpgrp(targp, uap->pgid, 0);
	246	return (0);
	247	}
	248
3c7eb27c DG	249	struct setuid_args {
	250	int uid;
	251	};
	252
15637ed4	253	/* ARGSUSED */
4c45483e	254	int
15637ed4 RG	255	setuid(p, uap, retval)
15637ed4 RG	256	struct proc *p;
3c7eb27c	257	struct setuid_args *uap;
15637ed4 RG	258	int *retval;
	259	{
	260	register struct pcred *pc = p->p_cred;
	261	register uid_t uid;
	262	int error;
	263
	264	uid = uap->uid;
	265	if (uid != pc->p_ruid &&
	266	(error = suser(pc->pc_ucred, &p->p_acflag)))
	267	return (error);
	268	/*
	269	* Everything's okay, do it. Copy credentials so other references do
	270	* not see our changes.
	271	*/
	272	pc->pc_ucred = crcopy(pc->pc_ucred);
	273	pc->pc_ucred->cr_uid = uid;
	274	pc->p_ruid = uid;
	275	pc->p_svuid = uid;
	276	return (0);
	277	}
	278
3c7eb27c DG	279	struct seteuid_args {
	280	int euid;
	281	};
	282
15637ed4	283	/* ARGSUSED */
4c45483e	284	int
15637ed4 RG	285	seteuid(p, uap, retval)
15637ed4 RG	286	struct proc *p;
3c7eb27c	287	struct seteuid_args *uap;
15637ed4 RG	288	int *retval;
	289	{
	290	register struct pcred *pc = p->p_cred;
	291	register uid_t euid;
	292	int error;
	293
	294	euid = uap->euid;
	295	if (euid != pc->p_ruid && euid != pc->p_svuid &&
	296	(error = suser(pc->pc_ucred, &p->p_acflag)))
	297	return (error);
	298	/*
	299	* Everything's okay, do it. Copy credentials so other references do
	300	* not see our changes.
	301	*/
	302	pc->pc_ucred = crcopy(pc->pc_ucred);
	303	pc->pc_ucred->cr_uid = euid;
	304	return (0);
	305	}
	306
3c7eb27c DG	307	struct setgid_args {
	308	int gid;
	309	};
	310
15637ed4	311	/* ARGSUSED */
4c45483e	312	int
15637ed4 RG	313	setgid(p, uap, retval)
15637ed4 RG	314	struct proc *p;
3c7eb27c	315	struct setgid_args *uap;
15637ed4 RG	316	int *retval;
	317	{
	318	register struct pcred *pc = p->p_cred;
	319	register gid_t gid;
	320	int error;
	321
	322	gid = uap->gid;
	323	if (gid != pc->p_rgid && (error = suser(pc->pc_ucred, &p->p_acflag)))
	324	return (error);
	325	pc->pc_ucred = crcopy(pc->pc_ucred);
	326	pc->pc_ucred->cr_groups[0] = gid;
	327	pc->p_rgid = gid;
	328	pc->p_svgid = gid; /* ??? */
	329	return (0);
	330	}
	331
3c7eb27c DG	332	struct setegid_args {
	333	int egid;
	334	};
	335
15637ed4	336	/* ARGSUSED */
4c45483e	337	int
15637ed4 RG	338	setegid(p, uap, retval)
15637ed4 RG	339	struct proc *p;
3c7eb27c	340	struct setegid_args *uap;
15637ed4 RG	341	int *retval;
	342	{
	343	register struct pcred *pc = p->p_cred;
	344	register gid_t egid;
	345	int error;
	346
	347	egid = uap->egid;
	348	if (egid != pc->p_rgid && egid != pc->p_svgid &&
	349	(error = suser(pc->pc_ucred, &p->p_acflag)))
	350	return (error);
	351	pc->pc_ucred = crcopy(pc->pc_ucred);
	352	pc->pc_ucred->cr_groups[0] = egid;
	353	return (0);
	354	}
	355
	356	#ifdef COMPAT_43
3c7eb27c DG	357
	358	struct osetreuid_args {
	359	int ruid;
	360	int euid;
	361	};
	362
15637ed4	363	/* ARGSUSED */
4c45483e	364	int
15637ed4 RG	365	osetreuid(p, uap, retval)
15637ed4 RG	366	register struct proc *p;
3c7eb27c	367	struct osetreuid_args *uap;
15637ed4 RG	368	int *retval;
	369	{
	370	register struct pcred *pc = p->p_cred;
	371	register uid_t ruid, euid;
	372	int error;
	373
	374	if (uap->ruid == -1)
	375	ruid = pc->p_ruid;
	376	else
	377	ruid = uap->ruid;
	378	/*
	379	* Allow setting real uid to previous effective, for swapping real and
	380	* effective. This should be:
	381	*
	382	* if (ruid != pc->p_ruid &&
	383	* (error = suser(pc->pc_ucred, &p->p_acflag)))
	384	*/
	385	if (ruid != pc->p_ruid && ruid != pc->pc_ucred->cr_uid /* XXX */ &&
	386	(error = suser(pc->pc_ucred, &p->p_acflag)))
	387	return (error);
	388	if (uap->euid == -1)
	389	euid = pc->pc_ucred->cr_uid;
	390	else
	391	euid = uap->euid;
	392	if (euid != pc->pc_ucred->cr_uid && euid != pc->p_ruid &&
	393	euid != pc->p_svuid && (error = suser(pc->pc_ucred, &p->p_acflag)))
	394	return (error);
	395	/*
	396	* Everything's okay, do it. Copy credentials so other references do
	397	* not see our changes.
	398	*/
	399	pc->pc_ucred = crcopy(pc->pc_ucred);
	400	pc->pc_ucred->cr_uid = euid;
	401	pc->p_ruid = ruid;
	402	return (0);
	403	}
	404
3c7eb27c DG	405	struct osetregid_args {
	406	int rgid;
	407	int egid;
	408	};
	409
15637ed4	410	/* ARGSUSED */
4c45483e	411	int
15637ed4 RG	412	osetregid(p, uap, retval)
15637ed4 RG	413	register struct proc *p;
3c7eb27c	414	struct osetregid_args *uap;
15637ed4 RG	415	int *retval;
	416	{
	417	register struct pcred *pc = p->p_cred;
	418	register gid_t rgid, egid;
	419	int error;
	420
	421	if (uap->rgid == -1)
	422	rgid = pc->p_rgid;
	423	else
	424	rgid = uap->rgid;
	425	/*
	426	* Allow setting real gid to previous effective, for swapping real and
	427	* effective. This didn't really work correctly in 4.[23], but is
	428	* preserved so old stuff doesn't fail. This should be:
	429	*
	430	* if (rgid != pc->p_rgid &&
	431	* (error = suser(pc->pc_ucred, &p->p_acflag)))
	432	*/
	433	if (rgid != pc->p_rgid && rgid != pc->pc_ucred->cr_groups[0] /* XXX */ &&
	434	(error = suser(pc->pc_ucred, &p->p_acflag)))
	435	return (error);
	436	if (uap->egid == -1)
	437	egid = pc->pc_ucred->cr_groups[0];
	438	else
	439	egid = uap->egid;
	440	if (egid != pc->pc_ucred->cr_groups[0] && egid != pc->p_rgid &&
	441	egid != pc->p_svgid && (error = suser(pc->pc_ucred, &p->p_acflag)))
	442	return (error);
	443	pc->pc_ucred = crcopy(pc->pc_ucred);
	444	pc->pc_ucred->cr_groups[0] = egid;
	445	pc->p_rgid = rgid;
	446	return (0);
	447	}
	448	#endif
	449
3c7eb27c DG	450	struct setgroups_args {
	451	u_int gidsetsize;
	452	int *gidset;
	453	};
	454
15637ed4	455	/* ARGSUSED */
4c45483e	456	int
15637ed4 RG	457	setgroups(p, uap, retval)
15637ed4 RG	458	struct proc *p;
3c7eb27c	459	struct setgroups_args *uap;
15637ed4 RG	460	int *retval;
	461	{
	462	register struct pcred *pc = p->p_cred;
	463	register gid_t *gp;
	464	register u_int ngrp;
	465	register int *lp;
	466	int error, groups[NGROUPS];
	467
	468	if (error = suser(pc->pc_ucred, &p->p_acflag))
	469	return (error);
	470	if ((ngrp = uap->gidsetsize) > NGROUPS)
	471	return (EINVAL);
	472	if (error = copyin((caddr_t)uap->gidset, (caddr_t)groups,
	473	ngrp * sizeof (groups[0])))
	474	return (error);
	475	pc->pc_ucred = crcopy(pc->pc_ucred);
	476	pc->pc_ucred->cr_ngroups = ngrp;
	477	/* convert from int's to gid_t's */
	478	for (gp = pc->pc_ucred->cr_groups, lp = groups; ngrp--; )
	479	gp++ = lp++;
	480	return (0);
	481	}
	482
	483	/*
	484	* Check if gid is a member of the group set.
	485	*/
4c45483e	486	int
15637ed4 RG	487	groupmember(gid, cred)
	488	gid_t gid;
	489	register struct ucred *cred;
	490	{
	491	register gid_t *gp;
	492	gid_t *egp;
	493
	494	egp = &(cred->cr_groups[cred->cr_ngroups]);
	495	for (gp = cred->cr_groups; gp < egp; gp++)
	496	if (*gp == gid)
	497	return (1);
	498	return (0);
	499	}
	500
	501	/*
	502	* Test whether the specified credentials imply "super-user"
	503	* privilege; if so, and we have accounting info, set the flag
	504	* indicating use of super-powers.
	505	* Returns 0 or error.
	506	*/
4c45483e	507	int
15637ed4 RG	508	suser(cred, acflag)
	509	struct ucred *cred;
	510	u_short *acflag;
	511	{
	512	if (cred->cr_uid == 0) {
	513	if (acflag)
	514	*acflag \|= ASU;
	515	return (0);
	516	}
	517	return (EPERM);
	518	}
	519
	520	/*
	521	* Allocate a zeroed cred structure.
	522	*/
	523	struct ucred *
	524	crget()
	525	{
	526	register struct ucred *cr;
	527
	528	MALLOC(cr, struct ucred , sizeof(cr), M_CRED, M_WAITOK);
	529	bzero((caddr_t)cr, sizeof(*cr));
	530	cr->cr_ref = 1;
	531	return (cr);
	532	}
	533
	534	/*
	535	* Free a cred structure.
	536	* Throws away space when ref count gets to 0.
	537	*/
4c45483e	538	void
15637ed4 RG	539	crfree(cr)
	540	struct ucred *cr;
	541	{
4c45483e	542	int s = splimp(); /* ??? XXX FIXME */
15637ed4 RG	543
	544	if (--cr->cr_ref != 0) {
	545	(void) splx(s);
	546	return;
	547	}
	548	FREE((caddr_t)cr, M_CRED);
	549	(void) splx(s);
	550	}
	551
	552	/*
	553	* Copy cred structure to a new one and free the old one.
	554	*/
	555	struct ucred *
	556	crcopy(cr)
	557	struct ucred *cr;
	558	{
	559	struct ucred *newcr;
	560
	561	if (cr->cr_ref == 1)
	562	return (cr);
	563	newcr = crget();
	564	newcr = cr;
	565	crfree(cr);
	566	newcr->cr_ref = 1;
	567	return (newcr);
	568	}
	569
	570	/*
	571	* Dup cred struct to a new held one.
	572	*/
	573	struct ucred *
	574	crdup(cr)
	575	struct ucred *cr;
	576	{
	577	struct ucred *newcr;
	578
	579	newcr = crget();
	580	newcr = cr;
	581	newcr->cr_ref = 1;
	582	return (newcr);
	583	}
	584
	585	/*
	586	* Get login name, if available.
	587	*/
3c7eb27c DG	588
	589	struct getlogin_args {
	590	char *namebuf;
	591	u_int namelen;
	592	};
	593
15637ed4	594	/* ARGSUSED */
4c45483e	595	int
15637ed4 RG	596	getlogin(p, uap, retval)
15637ed4 RG	597	struct proc *p;
3c7eb27c	598	struct getlogin_args *uap;
15637ed4 RG	599	int *retval;
	600	{
	601
	602	if (uap->namelen > sizeof (p->p_pgrp->pg_session->s_login))
	603	uap->namelen = sizeof (p->p_pgrp->pg_session->s_login);
	604	return (copyout((caddr_t) p->p_pgrp->pg_session->s_login,
	605	(caddr_t) uap->namebuf, uap->namelen));
	606	}
	607
	608	/*
	609	* Set login name.
	610	*/
3c7eb27c DG	611
	612	struct setlogin_args {
	613	char *namebuf;
	614	};
	615
15637ed4	616	/* ARGSUSED */
4c45483e	617	int
15637ed4 RG	618	setlogin(p, uap, retval)
15637ed4 RG	619	struct proc *p;
3c7eb27c	620	struct setlogin_args *uap;
15637ed4 RG	621	int *retval;
	622	{
	623	int error;
	624
	625	if (error = suser(p->p_ucred, &p->p_acflag))
	626	return (error);
	627	error = copyinstr((caddr_t) uap->namebuf,
	628	(caddr_t) p->p_pgrp->pg_session->s_login,
	629	sizeof (p->p_pgrp->pg_session->s_login) - 1, (u_int *)0);
	630	if (error == ENAMETOOLONG)
	631	error = EINVAL;
	632	return (error);
	633	}