X-Git-Url: https://git.subgeniuskitty.com/unix-history/.git/blobdiff_plain/38b6104cbeb1de7fc36bc2a9b4b78e55168a98e2..a2f658f997662926f2a54d337f2ed9abde78f991:/usr/src/sys/kern/kern_prot.c

diff --git a/usr/src/sys/kern/kern_prot.c b/usr/src/sys/kern/kern_prot.c
index 3d376fd0fc..4ccfd65783 100644
--- a/usr/src/sys/kern/kern_prot.c
+++ b/usr/src/sys/kern/kern_prot.c
@@ -1,25 +1,41 @@
-/*	kern_prot.c	6.3	85/03/18	*/
+/*
+ * Copyright (c) 1982, 1986, 1989 Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that the above copyright notice and this paragraph are
+ * duplicated in all such forms and that any documentation,
+ * advertising materials, and other materials related to such
+ * distribution and use acknowledge that the software was developed
+ * by the University of California, Berkeley.  The name of the
+ * University may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ *	@(#)kern_prot.c	7.7 (Berkeley) %G%
+ */
 
 /*
  * System calls related to processes and protection
  */
 
-#include "../machine/reg.h"
-
 #include "param.h"
+#include "acct.h"
 #include "systm.h"
-#include "dir.h"
 #include "user.h"
-#include "inode.h"
 #include "proc.h"
 #include "timeb.h"
 #include "times.h"
 #include "reboot.h"
-#include "fs.h"
-#include "conf.h"
-#include "buf.h"
 #include "mount.h"
-#include "quota.h"
+#include "buf.h"
+#include "../ufs/quota.h"
+#include "malloc.h"
+#define GRPSTART 0
+
+#include "machine/reg.h"
 
 getpid()
 {
@@ -36,13 +52,12 @@ getpgrp()
 	register struct proc *p;
 
 	if (uap->pid == 0)
-		uap->pid = u.u_procp->p_pid;
-	p = pfind(uap->pid);
-	if (p == 0) {
+		p = u.u_procp;
+	else if ((p = pfind(uap->pid)) == 0) {
 		u.u_error = ESRCH;
 		return;
 	}
-	u.u_r.r_val1 = p->p_pgrp;
+	u.u_r.r_val1 = p->p_pgrp->pg_id;
 }
 
 getuid()
@@ -69,15 +84,17 @@ getgroups()
 	register int *lp;
 	int groups[NGROUPS];
 
-	for (gp = &u.u_groups[NGROUPS]; gp > u.u_groups; gp--)
-		if (gp[-1] != NOGROUP)
-			break;
-	if (uap->gidsetsize < gp - u.u_groups) {
+	if (uap->gidsetsize == 0) {
+		u.u_r.r_val1 = u.u_ngroups - GRPSTART;
+		return;
+	}
+	if (uap->gidsetsize < u.u_ngroups - GRPSTART) {
 		u.u_error = EINVAL;
 		return;
 	}
-	uap->gidsetsize = gp - u.u_groups;
-	for (lp = groups, gp = u.u_groups; lp < &groups[uap->gidsetsize]; )
+	uap->gidsetsize = u.u_ngroups - GRPSTART;
+	gp = &u.u_groups[GRPSTART];
+	for (lp = groups; lp < &groups[uap->gidsetsize]; )
 		*lp++ = *gp++;
 	u.u_error = copyout((caddr_t)groups, (caddr_t)uap->gidset,
 	    uap->gidsetsize * sizeof (groups[0]));
@@ -86,27 +103,71 @@ getgroups()
 	u.u_r.r_val1 = uap->gidsetsize;
 }
 
+setsid()
+{
+	register struct proc *p = u.u_procp;
+
+	if ((p->p_pgid == p->p_pid) || pgfind(p->p_pid))
+		u.u_error = EPERM;
+	else {
+		pgmv(p, p->p_pid, 1);
+		u.u_r.r_val1 = p->p_pid;
+	}
+	return;
+}
+
+/*
+ * set process group
+ *
+ * if target pid != caller's pid
+ *	pid must be an inferior
+ *	pid must be in same session
+ *	pid can't have done an exec
+ *	there must exist a pid with pgid in same session 
+ * pid must not be session leader
+ */
 setpgrp()
 {
-	register struct proc *p;
 	register struct a {
 		int	pid;
-		int	pgrp;
+		int	pgid;
 	} *uap = (struct a *)u.u_ap;
+	register struct proc *p;
+	register struct pgrp *pgrp;
 
 	if (uap->pid == 0)
-		uap->pid = u.u_procp->p_pid;
-	p = pfind(uap->pid);
-	if (p == 0) {
+		p = u.u_procp;
+	else if ((p = pfind(uap->pid)) == 0 || !inferior(p)) {
 		u.u_error = ESRCH;
 		return;
 	}
-/* need better control mechanisms for process groups */
-	if (p->p_uid != u.u_uid && u.u_uid && !inferior(p)) {
+	else if (p != u.u_procp) { 
+		if (p->p_session != u.u_procp->p_session) {
+			u.u_error = EPERM;
+			return;
+		}
+		if (p->p_flag&SEXEC) {
+			u.u_error = EACCES;
+			return;
+		}
+	}
+	if (SESS_LEADER(p)) {
 		u.u_error = EPERM;
 		return;
 	}
-	p->p_pgrp = uap->pgrp;
+	if (uap->pgid == 0)
+		uap->pgid = p->p_pid;
+	else if ((uap->pgid != p->p_pid) &&
+		(((pgrp = pgfind(uap->pgid)) == 0) || 
+		   pgrp->pg_mem == NULL ||
+	           pgrp->pg_session != u.u_procp->p_session)) {
+		u.u_error = EPERM;
+		return;
+	}
+	/*
+	 * done checking, now doit
+	 */
+	pgmv(p, uap->pgid, 0);
 }
 
 setreuid()
@@ -121,23 +182,25 @@ setreuid()
 	ruid = uap->ruid;
 	if (ruid == -1)
 		ruid = u.u_ruid;
-	if (u.u_ruid != ruid && u.u_uid != ruid && !suser())
 		return;
 	euid = uap->euid;
 	if (euid == -1)
 		euid = u.u_uid;
-	if (u.u_ruid != euid && u.u_uid != euid && !suser())
 		return;
 	/*
 	 * Everything's okay, do it.
+	 * Copy credentials so other references do not
+	 * see our changes.
 	 */
 #ifdef QUOTA
 	if (u.u_quota->q_uid != ruid) {
 		qclean();
-		qstart(getquota(ruid, 0, 0));
+		qstart(getquota((uid_t)ruid, 0, 0));
 	}
 #endif
-	u.u_procp->p_uid = ruid;
+	if (u.u_cred->cr_ref > 1)
+		u.u_cred = crcopy(u.u_cred);
+	u.u_procp->p_uid = euid;
 	u.u_ruid = ruid;
 	u.u_uid = euid;
 }
@@ -154,18 +217,14 @@ setregid()
 	rgid = uap->rgid;
 	if (rgid == -1)
 		rgid = u.u_rgid;
-	if (u.u_rgid != rgid && u.u_gid != rgid && !suser())
 		return;
 	egid = uap->egid;
 	if (egid == -1)
 		egid = u.u_gid;
-	if (u.u_rgid != egid && u.u_gid != egid && !suser())
 		return;
-	if (u.u_rgid != rgid) {
-		leavegroup(u.u_rgid);
-		(void) entergroup(rgid);
-		u.u_rgid = rgid;
-	}
+	if (u.u_cred->cr_ref > 1)
+		u.u_cred = crcopy(u.u_cred);
+	u.u_rgid = rgid;
 	u.u_gid = egid;
 }
 
@@ -177,11 +236,12 @@ setgroups()
 	} *uap = (struct a *)u.u_ap;
 	register gid_t *gp;
 	register int *lp;
-	int groups[NGROUPS];
+	int ngrp, groups[NGROUPS];
 
-	if (!suser())
+	if (u.u_error = suser(u.u_cred, &u.u_acflag))
 		return;
-	if (uap->gidsetsize > sizeof (u.u_groups) / sizeof (u.u_groups[0])) {
+	ngrp = uap->gidsetsize + GRPSTART;
+	if (ngrp > sizeof (u.u_groups) / sizeof (u.u_groups[0])) {
 		u.u_error = EINVAL;
 		return;
 	}
@@ -189,65 +249,142 @@ setgroups()
 	    uap->gidsetsize * sizeof (groups[0]));
 	if (u.u_error)
 		return;
-	for (lp = groups, gp = u.u_groups; lp < &groups[uap->gidsetsize]; )
+	gp = &u.u_groups[GRPSTART];
+	for (lp = groups; lp < &groups[uap->gidsetsize]; )
 		*gp++ = *lp++;
-	for ( ; gp < &u.u_groups[NGROUPS]; gp++)
-		*gp = NOGROUP;
+	u.u_ngroups = ngrp;
 }
 
 /*
- * Group utility functions.
+ * 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);
+}
 
 /*
- * Delete gid from the group set.
+ * Test if the current user is the super user.
  */
-leavegroup(gid)
-	int gid;
+suser(cred, acflag)
+	struct ucred *cred;
+	short *acflag;
 {
-	register gid_t *gp;
 
-	for (gp = u.u_groups; gp < &u.u_groups[NGROUPS]; gp++)
-		if (*gp == gid)
-			goto found;
-	return;
-found:
-	for (; gp < &u.u_groups[NGROUPS-1]; gp++)
-		*gp = *(gp+1);
-	*gp = NOGROUP;
+	if (cred->cr_uid == 0) {
+		if (acflag)
+			*acflag |= ASU;
+		return (0);
+	}
+	return (EPERM);
 }
 
 /*
- * Add gid to the group set.
+ * Allocate a zeroed cred structure.
  */
-entergroup(gid)
-	int gid;
+struct ucred *
+crget()
 {
-	register gid_t *gp;
+	register struct ucred *cr;
 
-	for (gp = u.u_groups; gp < &u.u_groups[NGROUPS]; gp++) {
-		if (*gp == gid)
-			return (0);
-		if (*gp == NOGROUP) {
-			*gp = gid;
-			return (0);
-		}
+	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;
 	}
-	return (-1);
+	FREE((caddr_t)cr, M_CRED);
+	(void) splx(s);
 }
 
 /*
- * Check if gid is a member of the group set.
+ * Copy cred structure to a new one and free the old one.
  */
-groupmember(gid)
-	gid_t gid;
+struct ucred *
+crcopy(cr)
+	struct ucred *cr;
 {
-	register gid_t *gp;
+	struct ucred *newcr;
 
-	if (u.u_gid == gid)
-		return (1);
-	for (gp = u.u_groups; gp < &u.u_groups[NGROUPS] && *gp != NOGROUP; gp++)
-		if (*gp == gid)
-			return (1);
-	return (0);
+	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 of process owner, if available
+ */
+
+getlogname()
+{
+	struct a {
+		char	*namebuf;
+		u_int	namelen;
+	} *uap = (struct a *)u.u_ap;
+
+	if (uap->namelen > sizeof (u.u_logname))
+		uap->namelen = sizeof (u.u_logname);
+	u.u_error = copyout((caddr_t)u.u_logname, (caddr_t)uap->namebuf,
+		uap->namelen);
+}
+
+/*
+ * Set login name of process owner
+ */
+
+setlogname()
+{
+	struct a {
+		char	*namebuf;
+		u_int	namelen;
+	} *uap = (struct a *)u.u_ap;
+
+	if (u.u_error = suser(u.u_cred, &u.u_acflag))
+		return;
+	if (uap->namelen > sizeof (u.u_logname) - 1)
+		u.u_error = EINVAL;
+	else {
+		u.u_logname[uap->namelen] = NULL;
+		u.u_error = copyin((caddr_t)uap->namebuf,
+			(caddr_t)u.u_logname, uap->namelen);
+	}
 }