[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
 *	$Id$
 */

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

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

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

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

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

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

/* ARGSUSED */
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 */
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 */
};

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 */
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 */
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 */
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 */
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 */
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 */
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 */
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 */
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 */
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.
 */
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.
 */
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.
 */
crfree(cr)
	struct ucred *cr;
{
	int s = splimp();			/* ??? */

	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 */
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 */
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	*
78ed81a3	33	* from: @(#)kern_prot.c 7.21 (Berkeley) 5/3/91
78ed81a3	34	* $Id$
15637ed4 RG	35	*/
	36
	37	/*
	38	* System calls related to processes and protection
	39	*/
	40
	41	#include "param.h"
	42	#include "acct.h"
	43	#include "systm.h"
	44	#include "ucred.h"
	45	#include "proc.h"
	46	#include "timeb.h"
	47	#include "times.h"
	48	#include "malloc.h"
	49
	50	/* ARGSUSED */
	51	getpid(p, uap, retval)
	52	struct proc *p;
	53	void *uap;
	54	int *retval;
	55	{
	56
	57	*retval = p->p_pid;
	58	#ifdef COMPAT_43
	59	retval[1] = p->p_pptr->p_pid;
	60	#endif
	61	return (0);
	62	}
	63
	64	/* ARGSUSED */
	65	getppid(p, uap, retval)
	66	struct proc *p;
	67	void *uap;
	68	int *retval;
	69	{
	70
	71	*retval = p->p_pptr->p_pid;
	72	return (0);
	73	}
	74
	75	/* Get process group ID; note that POSIX getpgrp takes no parameter */
	76	getpgrp(p, uap, retval)
	77	struct proc *p;
	78	void *uap;
	79	int *retval;
	80	{
	81
	82	*retval = p->p_pgrp->pg_id;
	83	return (0);
	84	}
	85
	86	/* ARGSUSED */
	87	getuid(p, uap, retval)
	88	struct proc *p;
	89	void *uap;
	90	int *retval;
	91	{
	92
	93	*retval = p->p_cred->p_ruid;
	94	#ifdef COMPAT_43
	95	retval[1] = p->p_ucred->cr_uid;
	96	#endif
	97	return (0);
	98	}
99
100	/* ARGSUSED */
101	geteuid(p, uap, retval)
102	struct proc *p;
103	void *uap;
104	int *retval;
105	{
106
107	*retval = p->p_ucred->cr_uid;
108	return (0);
109	}
110
111	/* ARGSUSED */
112	getgid(p, uap, retval)
113	struct proc *p;
114	void *uap;
115	int *retval;
116	{
117
118	*retval = p->p_cred->p_rgid;
119	#ifdef COMPAT_43
120	retval[1] = p->p_ucred->cr_groups[0];
121	#endif
122	return (0);
123	}
124
125	/*
126	* Get effective group ID. The "egid" is groups[0], and could be obtained
127	* via getgroups. This syscall exists because it is somewhat painful to do
128	* correctly in a library function.
129	*/
130	/* ARGSUSED */
131	getegid(p, uap, retval)
132	struct proc *p;
133	void *uap;
134	int *retval;
135	{
136
137	*retval = p->p_ucred->cr_groups[0];
138	return (0);
139	}
140
78ed81a3	141	struct getgroups_args {
	142	u_int gidsetsize;
	143	int gidset; / XXX not yet POSIX */
	144	};
	145
15637ed4 RG	146	getgroups(p, uap, retval)
15637ed4 RG	147	struct proc *p;
78ed81a3	148	register struct getgroups_args *uap;
15637ed4 RG	149	int *retval;
	150	{
	151	register struct pcred *pc = p->p_cred;
	152	register gid_t *gp;
	153	register int *lp;
	154	register u_int ngrp;
	155	int groups[NGROUPS];
	156	int error;
	157
	158	if ((ngrp = uap->gidsetsize) == 0) {
	159	*retval = pc->pc_ucred->cr_ngroups;
	160	return (0);
	161	}
	162	if (ngrp < pc->pc_ucred->cr_ngroups)
	163	return (EINVAL);
	164	ngrp = pc->pc_ucred->cr_ngroups;
	165	for (gp = pc->pc_ucred->cr_groups, lp = groups; lp < &groups[ngrp]; )
	166	lp++ = gp++;
	167	if (error = copyout((caddr_t)groups, (caddr_t)uap->gidset,
	168	ngrp * sizeof (groups[0])))
	169	return (error);
	170	*retval = ngrp;
	171	return (0);
	172	}
	173
	174	/* ARGSUSED */
	175	setsid(p, uap, retval)
	176	register struct proc *p;
	177	void *uap;
	178	int *retval;
	179	{
	180
	181	if (p->p_pgid == p->p_pid \|\| pgfind(p->p_pid)) {
	182	return (EPERM);
	183	} else {
	184	enterpgrp(p, p->p_pid, 1);
	185	*retval = p->p_pid;
	186	return (0);
	187	}
	188	}
	189
	190	/*
	191	* set process group (setpgid/old setpgrp)
	192	*
	193	* caller does setpgid(targpid, targpgid)
	194	*
	195	* pid must be caller or child of caller (ESRCH)
	196	* if a child
	197	* pid must be in same session (EPERM)
	198	* pid can't have done an exec (EACCES)
	199	* if pgid != pid
	200	* there must exist some pid in same session having pgid (EPERM)
	201	* pid must not be session leader (EPERM)
	202	*/
78ed81a3	203
	204	struct setpgid_args {
	205	int pid; /* target process id */
	206	int pgid; /* target pgrp id */
	207	};
	208
15637ed4 RG	209	/* ARGSUSED */
	210	setpgid(curp, uap, retval)
	211	struct proc *curp;
78ed81a3	212	register struct setpgid_args *uap;
15637ed4 RG	213	int *retval;
	214	{
	215	register struct proc targp; / target process */
	216	register struct pgrp pgrp; / target pgrp */
	217
	218	if (uap->pid != 0 && uap->pid != curp->p_pid) {
	219	if ((targp = pfind(uap->pid)) == 0 \|\| !inferior(targp))
	220	return (ESRCH);
	221	if (targp->p_session != curp->p_session)
	222	return (EPERM);
	223	if (targp->p_flag&SEXEC)
	224	return (EACCES);
	225	} else
	226	targp = curp;
	227	if (SESS_LEADER(targp))
	228	return (EPERM);
	229	if (uap->pgid == 0)
	230	uap->pgid = targp->p_pid;
	231	else if (uap->pgid != targp->p_pid)
	232	if ((pgrp = pgfind(uap->pgid)) == 0 \|\|
	233	pgrp->pg_session != curp->p_session)
	234	return (EPERM);
	235	enterpgrp(targp, uap->pgid, 0);
	236	return (0);
	237	}
	238
78ed81a3	239	struct setuid_args {
	240	int uid;
	241	};
	242
15637ed4 RG	243	/* ARGSUSED */
	244	setuid(p, uap, retval)
	245	struct proc *p;
78ed81a3	246	struct setuid_args *uap;
15637ed4 RG	247	int *retval;
	248	{
	249	register struct pcred *pc = p->p_cred;
	250	register uid_t uid;
	251	int error;
	252
	253	uid = uap->uid;
	254	if (uid != pc->p_ruid &&
	255	(error = suser(pc->pc_ucred, &p->p_acflag)))
	256	return (error);
	257	/*
	258	* Everything's okay, do it. Copy credentials so other references do
	259	* not see our changes.
	260	*/
	261	pc->pc_ucred = crcopy(pc->pc_ucred);
	262	pc->pc_ucred->cr_uid = uid;
	263	pc->p_ruid = uid;
	264	pc->p_svuid = uid;
	265	return (0);
	266	}
	267
78ed81a3	268	struct seteuid_args {
	269	int euid;
	270	};
	271
15637ed4 RG	272	/* ARGSUSED */
	273	seteuid(p, uap, retval)
	274	struct proc *p;
78ed81a3	275	struct seteuid_args *uap;
15637ed4 RG	276	int *retval;
	277	{
	278	register struct pcred *pc = p->p_cred;
	279	register uid_t euid;
	280	int error;
	281
	282	euid = uap->euid;
	283	if (euid != pc->p_ruid && euid != pc->p_svuid &&
	284	(error = suser(pc->pc_ucred, &p->p_acflag)))
	285	return (error);
	286	/*
	287	* Everything's okay, do it. Copy credentials so other references do
	288	* not see our changes.
	289	*/
	290	pc->pc_ucred = crcopy(pc->pc_ucred);
	291	pc->pc_ucred->cr_uid = euid;
	292	return (0);
	293	}
	294
78ed81a3	295	struct setgid_args {
	296	int gid;
	297	};
	298
15637ed4 RG	299	/* ARGSUSED */
	300	setgid(p, uap, retval)
	301	struct proc *p;
78ed81a3	302	struct setgid_args *uap;
15637ed4 RG	303	int *retval;
	304	{
	305	register struct pcred *pc = p->p_cred;
	306	register gid_t gid;
	307	int error;
	308
	309	gid = uap->gid;
	310	if (gid != pc->p_rgid && (error = suser(pc->pc_ucred, &p->p_acflag)))
	311	return (error);
	312	pc->pc_ucred = crcopy(pc->pc_ucred);
	313	pc->pc_ucred->cr_groups[0] = gid;
	314	pc->p_rgid = gid;
	315	pc->p_svgid = gid; /* ??? */
	316	return (0);
	317	}
	318
78ed81a3	319	struct setegid_args {
	320	int egid;
	321	};
	322
15637ed4 RG	323	/* ARGSUSED */
	324	setegid(p, uap, retval)
	325	struct proc *p;
78ed81a3	326	struct setegid_args *uap;
15637ed4 RG	327	int *retval;
	328	{
	329	register struct pcred *pc = p->p_cred;
	330	register gid_t egid;
	331	int error;
	332
	333	egid = uap->egid;
	334	if (egid != pc->p_rgid && egid != pc->p_svgid &&
	335	(error = suser(pc->pc_ucred, &p->p_acflag)))
	336	return (error);
	337	pc->pc_ucred = crcopy(pc->pc_ucred);
	338	pc->pc_ucred->cr_groups[0] = egid;
	339	return (0);
	340	}
	341
	342	#ifdef COMPAT_43
78ed81a3	343
	344	struct osetreuid_args {
	345	int ruid;
	346	int euid;
	347	};
	348
15637ed4 RG	349	/* ARGSUSED */
	350	osetreuid(p, uap, retval)
	351	register struct proc *p;
78ed81a3	352	struct osetreuid_args *uap;
15637ed4 RG	353	int *retval;
	354	{
	355	register struct pcred *pc = p->p_cred;
	356	register uid_t ruid, euid;
	357	int error;
	358
	359	if (uap->ruid == -1)
	360	ruid = pc->p_ruid;
	361	else
	362	ruid = uap->ruid;
	363	/*
	364	* Allow setting real uid to previous effective, for swapping real and
	365	* effective. This should be:
	366	*
	367	* if (ruid != pc->p_ruid &&
	368	* (error = suser(pc->pc_ucred, &p->p_acflag)))
	369	*/
	370	if (ruid != pc->p_ruid && ruid != pc->pc_ucred->cr_uid /* XXX */ &&
	371	(error = suser(pc->pc_ucred, &p->p_acflag)))
	372	return (error);
	373	if (uap->euid == -1)
	374	euid = pc->pc_ucred->cr_uid;
	375	else
	376	euid = uap->euid;
	377	if (euid != pc->pc_ucred->cr_uid && euid != pc->p_ruid &&
	378	euid != pc->p_svuid && (error = suser(pc->pc_ucred, &p->p_acflag)))
	379	return (error);
	380	/*
	381	* Everything's okay, do it. Copy credentials so other references do
	382	* not see our changes.
	383	*/
	384	pc->pc_ucred = crcopy(pc->pc_ucred);
	385	pc->pc_ucred->cr_uid = euid;
	386	pc->p_ruid = ruid;
	387	return (0);
	388	}
	389
78ed81a3	390	struct osetregid_args {
	391	int rgid;
	392	int egid;
	393	};
	394
15637ed4 RG	395	/* ARGSUSED */
	396	osetregid(p, uap, retval)
	397	register struct proc *p;
78ed81a3	398	struct osetregid_args *uap;
15637ed4 RG	399	int *retval;
	400	{
	401	register struct pcred *pc = p->p_cred;
	402	register gid_t rgid, egid;
	403	int error;
	404
	405	if (uap->rgid == -1)
	406	rgid = pc->p_rgid;
	407	else
	408	rgid = uap->rgid;
	409	/*
	410	* Allow setting real gid to previous effective, for swapping real and
	411	* effective. This didn't really work correctly in 4.[23], but is
	412	* preserved so old stuff doesn't fail. This should be:
	413	*
	414	* if (rgid != pc->p_rgid &&
	415	* (error = suser(pc->pc_ucred, &p->p_acflag)))
	416	*/
	417	if (rgid != pc->p_rgid && rgid != pc->pc_ucred->cr_groups[0] /* XXX */ &&
	418	(error = suser(pc->pc_ucred, &p->p_acflag)))
	419	return (error);
	420	if (uap->egid == -1)
	421	egid = pc->pc_ucred->cr_groups[0];
	422	else
	423	egid = uap->egid;
	424	if (egid != pc->pc_ucred->cr_groups[0] && egid != pc->p_rgid &&
	425	egid != pc->p_svgid && (error = suser(pc->pc_ucred, &p->p_acflag)))
	426	return (error);
	427	pc->pc_ucred = crcopy(pc->pc_ucred);
	428	pc->pc_ucred->cr_groups[0] = egid;
	429	pc->p_rgid = rgid;
	430	return (0);
	431	}
	432	#endif
	433
78ed81a3	434	struct setgroups_args {
	435	u_int gidsetsize;
	436	int *gidset;
	437	};
	438
15637ed4 RG	439	/* ARGSUSED */
	440	setgroups(p, uap, retval)
	441	struct proc *p;
78ed81a3	442	struct setgroups_args *uap;
15637ed4 RG	443	int *retval;
	444	{
	445	register struct pcred *pc = p->p_cred;
	446	register gid_t *gp;
	447	register u_int ngrp;
	448	register int *lp;
	449	int error, groups[NGROUPS];
	450
	451	if (error = suser(pc->pc_ucred, &p->p_acflag))
	452	return (error);
	453	if ((ngrp = uap->gidsetsize) > NGROUPS)
	454	return (EINVAL);
	455	if (error = copyin((caddr_t)uap->gidset, (caddr_t)groups,
	456	ngrp * sizeof (groups[0])))
	457	return (error);
	458	pc->pc_ucred = crcopy(pc->pc_ucred);
	459	pc->pc_ucred->cr_ngroups = ngrp;
	460	/* convert from int's to gid_t's */
	461	for (gp = pc->pc_ucred->cr_groups, lp = groups; ngrp--; )
	462	gp++ = lp++;
	463	return (0);
	464	}
	465
	466	/*
	467	* Check if gid is a member of the group set.
	468	*/
	469	groupmember(gid, cred)
	470	gid_t gid;
	471	register struct ucred *cred;
	472	{
	473	register gid_t *gp;
	474	gid_t *egp;
	475
	476	egp = &(cred->cr_groups[cred->cr_ngroups]);
	477	for (gp = cred->cr_groups; gp < egp; gp++)
	478	if (*gp == gid)
	479	return (1);
	480	return (0);
	481	}
	482
	483	/*
	484	* Test whether the specified credentials imply "super-user"
	485	* privilege; if so, and we have accounting info, set the flag
	486	* indicating use of super-powers.
	487	* Returns 0 or error.
	488	*/
	489	suser(cred, acflag)
	490	struct ucred *cred;
	491	u_short *acflag;
	492	{
	493	if (cred->cr_uid == 0) {
	494	if (acflag)
	495	*acflag \|= ASU;
	496	return (0);
	497	}
	498	return (EPERM);
	499	}
	500
	501	/*
	502	* Allocate a zeroed cred structure.
	503	*/
	504	struct ucred *
	505	crget()
	506	{
507	register struct ucred *cr;
508
509	MALLOC(cr, struct ucred , sizeof(cr), M_CRED, M_WAITOK);
510	bzero((caddr_t)cr, sizeof(*cr));
511	cr->cr_ref = 1;
512	return (cr);
513	}
514
515	/*
516	* Free a cred structure.
517	* Throws away space when ref count gets to 0.
518	*/
519	crfree(cr)
520	struct ucred *cr;
521	{
522	int s = splimp(); /* ??? */
523
524	if (--cr->cr_ref != 0) {
525	(void) splx(s);
526	return;
527	}
528	FREE((caddr_t)cr, M_CRED);
529	(void) splx(s);
530	}
531
532	/*
533	* Copy cred structure to a new one and free the old one.
534	*/
535	struct ucred *
536	crcopy(cr)
537	struct ucred *cr;
538	{
539	struct ucred *newcr;
540
541	if (cr->cr_ref == 1)
542	return (cr);
543	newcr = crget();
544	newcr = cr;
545	crfree(cr);
546	newcr->cr_ref = 1;
547	return (newcr);
548	}
549
550	/*
551	* Dup cred struct to a new held one.
552	*/
553	struct ucred *
554	crdup(cr)
555	struct ucred *cr;
556	{
557	struct ucred *newcr;
558
559	newcr = crget();
560	newcr = cr;
561	newcr->cr_ref = 1;
562	return (newcr);
563	}
564
565	/*
566	* Get login name, if available.
567	*/
78ed81a3	568
	569	struct getlogin_args {
	570	char *namebuf;
	571	u_int namelen;
	572	};
	573
15637ed4 RG	574	/* ARGSUSED */
	575	getlogin(p, uap, retval)
	576	struct proc *p;
78ed81a3	577	struct getlogin_args *uap;
15637ed4 RG	578	int *retval;
	579	{
	580
	581	if (uap->namelen > sizeof (p->p_pgrp->pg_session->s_login))
	582	uap->namelen = sizeof (p->p_pgrp->pg_session->s_login);
	583	return (copyout((caddr_t) p->p_pgrp->pg_session->s_login,
	584	(caddr_t) uap->namebuf, uap->namelen));
	585	}
	586
	587	/*
	588	* Set login name.
	589	*/
78ed81a3	590
	591	struct setlogin_args {
	592	char *namebuf;
	593	};
	594
15637ed4 RG	595	/* ARGSUSED */
	596	setlogin(p, uap, retval)
	597	struct proc *p;
78ed81a3	598	struct setlogin_args *uap;
15637ed4 RG	599	int *retval;
	600	{
	601	int error;
	602
	603	if (error = suser(p->p_ucred, &p->p_acflag))
	604	return (error);
	605	error = copyinstr((caddr_t) uap->namebuf,
	606	(caddr_t) p->p_pgrp->pg_session->s_login,
	607	sizeof (p->p_pgrp->pg_session->s_login) - 1, (u_int *)0);
	608	if (error == ENAMETOOLONG)
	609	error = EINVAL;
	610	return (error);
	611	}