[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.
 *
 *	@(#)kern_prot.c	7.21 (Berkeley) 5/3/91
 */

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