65de0c7a93
which is fortunate, because otherwise another bug would allow them to be used to stomp on the syscall return value of another process.
899 lines
20 KiB
C
899 lines
20 KiB
C
/*
|
|
* Copyright (c) 1982, 1986, 1989, 1990, 1991, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
* (c) UNIX System Laboratories, Inc.
|
|
* All or some portions of this file are derived from material licensed
|
|
* to the University of California by American Telephone and Telegraph
|
|
* Co. or Unix System Laboratories, Inc. and are reproduced herein with
|
|
* the permission of UNIX System Laboratories, Inc.
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|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
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|
* 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 8.6 (Berkeley) 1/21/94
|
|
* $Id: kern_prot.c,v 1.42 1998/11/10 09:16:29 peter Exp $
|
|
*/
|
|
|
|
/*
|
|
* System calls related to processes and protection
|
|
*/
|
|
|
|
#include "opt_compat.h"
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/acct.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/sysproto.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/unistd.h>
|
|
#include <sys/pioctl.h>
|
|
|
|
static MALLOC_DEFINE(M_CRED, "cred", "credentials");
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct getpid_args {
|
|
int dummy;
|
|
};
|
|
#endif
|
|
|
|
/* ARGSUSED */
|
|
int
|
|
getpid(p, uap)
|
|
struct proc *p;
|
|
struct getpid_args *uap;
|
|
{
|
|
|
|
p->p_retval[0] = p->p_pid;
|
|
#if defined(COMPAT_43) || defined(COMPAT_SUNOS)
|
|
p->p_retval[1] = p->p_pptr->p_pid;
|
|
#endif
|
|
return (0);
|
|
}
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct getppid_args {
|
|
int dummy;
|
|
};
|
|
#endif
|
|
/* ARGSUSED */
|
|
int
|
|
getppid(p, uap)
|
|
struct proc *p;
|
|
struct getppid_args *uap;
|
|
{
|
|
|
|
p->p_retval[0] = p->p_pptr->p_pid;
|
|
return (0);
|
|
}
|
|
|
|
/* Get process group ID; note that POSIX getpgrp takes no parameter */
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct getpgrp_args {
|
|
int dummy;
|
|
};
|
|
#endif
|
|
|
|
int
|
|
getpgrp(p, uap)
|
|
struct proc *p;
|
|
struct getpgrp_args *uap;
|
|
{
|
|
|
|
p->p_retval[0] = p->p_pgrp->pg_id;
|
|
return (0);
|
|
}
|
|
|
|
/* Get an arbitary pid's process group id */
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct getpgid_args {
|
|
pid_t pid;
|
|
};
|
|
#endif
|
|
|
|
int
|
|
getpgid(p, uap)
|
|
struct proc *p;
|
|
struct getpgid_args *uap;
|
|
{
|
|
struct proc *pt;
|
|
|
|
pt = p;
|
|
if (uap->pid == 0)
|
|
goto found;
|
|
|
|
if ((pt = pfind(uap->pid)) == 0)
|
|
return ESRCH;
|
|
found:
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|
p->p_retval[0] = pt->p_pgrp->pg_id;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Get an arbitary pid's session id.
|
|
*/
|
|
#ifndef _SYS_SYSPROTO_H_
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|
struct getsid_args {
|
|
pid_t pid;
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|
};
|
|
#endif
|
|
|
|
int
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|
getsid(p, uap)
|
|
struct proc *p;
|
|
struct getsid_args *uap;
|
|
{
|
|
struct proc *pt;
|
|
|
|
pt = p;
|
|
if (uap->pid == 0)
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|
goto found;
|
|
|
|
if ((pt == pfind(uap->pid)) == 0)
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|
return ESRCH;
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|
found:
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|
p->p_retval[0] = pt->p_session->s_sid;
|
|
return 0;
|
|
}
|
|
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct getuid_args {
|
|
int dummy;
|
|
};
|
|
#endif
|
|
|
|
/* ARGSUSED */
|
|
int
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|
getuid(p, uap)
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|
struct proc *p;
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|
struct getuid_args *uap;
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|
{
|
|
|
|
p->p_retval[0] = p->p_cred->p_ruid;
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|
#if defined(COMPAT_43) || defined(COMPAT_SUNOS)
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|
p->p_retval[1] = p->p_ucred->cr_uid;
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|
#endif
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|
return (0);
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|
}
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
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|
struct geteuid_args {
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|
int dummy;
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|
};
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|
#endif
|
|
|
|
/* ARGSUSED */
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|
int
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|
geteuid(p, uap)
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|
struct proc *p;
|
|
struct geteuid_args *uap;
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|
{
|
|
|
|
p->p_retval[0] = p->p_ucred->cr_uid;
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|
return (0);
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|
}
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
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|
struct getgid_args {
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|
int dummy;
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|
};
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|
#endif
|
|
|
|
/* ARGSUSED */
|
|
int
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|
getgid(p, uap)
|
|
struct proc *p;
|
|
struct getgid_args *uap;
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|
{
|
|
|
|
p->p_retval[0] = p->p_cred->p_rgid;
|
|
#if defined(COMPAT_43) || defined(COMPAT_SUNOS)
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|
p->p_retval[1] = p->p_ucred->cr_groups[0];
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|
#endif
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|
return (0);
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|
}
|
|
|
|
/*
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|
* 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
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|
* correctly in a library function.
|
|
*/
|
|
#ifndef _SYS_SYSPROTO_H_
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|
struct getegid_args {
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|
int dummy;
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|
};
|
|
#endif
|
|
|
|
/* ARGSUSED */
|
|
int
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|
getegid(p, uap)
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|
struct proc *p;
|
|
struct getegid_args *uap;
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|
{
|
|
|
|
p->p_retval[0] = p->p_ucred->cr_groups[0];
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|
return (0);
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|
}
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct getgroups_args {
|
|
u_int gidsetsize;
|
|
gid_t *gidset;
|
|
};
|
|
#endif
|
|
int
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|
getgroups(p, uap)
|
|
struct proc *p;
|
|
register struct getgroups_args *uap;
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|
{
|
|
register struct pcred *pc = p->p_cred;
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|
register u_int ngrp;
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|
int error;
|
|
|
|
if ((ngrp = uap->gidsetsize) == 0) {
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|
p->p_retval[0] = pc->pc_ucred->cr_ngroups;
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|
return (0);
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|
}
|
|
if (ngrp < pc->pc_ucred->cr_ngroups)
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|
return (EINVAL);
|
|
ngrp = pc->pc_ucred->cr_ngroups;
|
|
if ((error = copyout((caddr_t)pc->pc_ucred->cr_groups,
|
|
(caddr_t)uap->gidset, ngrp * sizeof(gid_t))))
|
|
return (error);
|
|
p->p_retval[0] = ngrp;
|
|
return (0);
|
|
}
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct setsid_args {
|
|
int dummy;
|
|
};
|
|
#endif
|
|
|
|
/* ARGSUSED */
|
|
int
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|
setsid(p, uap)
|
|
register struct proc *p;
|
|
struct setsid_args *uap;
|
|
{
|
|
|
|
if (p->p_pgid == p->p_pid || pgfind(p->p_pid)) {
|
|
return (EPERM);
|
|
} else {
|
|
(void)enterpgrp(p, p->p_pid, 1);
|
|
p->p_retval[0] = 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)
|
|
*/
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct setpgid_args {
|
|
int pid; /* target process id */
|
|
int pgid; /* target pgrp id */
|
|
};
|
|
#endif
|
|
/* ARGSUSED */
|
|
int
|
|
setpgid(curp, uap)
|
|
struct proc *curp;
|
|
register struct setpgid_args *uap;
|
|
{
|
|
register struct proc *targp; /* target process */
|
|
register struct pgrp *pgrp; /* target pgrp */
|
|
|
|
if (uap->pgid < 0)
|
|
return (EINVAL);
|
|
if (uap->pid != 0 && uap->pid != curp->p_pid) {
|
|
if ((targp = pfind(uap->pid)) == 0 || !inferior(targp))
|
|
return (ESRCH);
|
|
if (targp->p_pgrp == NULL || targp->p_session != curp->p_session)
|
|
return (EPERM);
|
|
if (targp->p_flag & P_EXEC)
|
|
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);
|
|
return (enterpgrp(targp, uap->pgid, 0));
|
|
}
|
|
|
|
/*
|
|
* Use the clause in B.4.2.2 that allows setuid/setgid to be 4.2/4.3BSD
|
|
* compatable. It says that setting the uid/gid to euid/egid is a special
|
|
* case of "appropriate privilege". Once the rules are expanded out, this
|
|
* basically means that setuid(nnn) sets all three id's, in all permitted
|
|
* cases unless _POSIX_SAVED_IDS is enabled. In that case, setuid(getuid())
|
|
* does not set the saved id - this is dangerous for traditional BSD
|
|
* programs. For this reason, we *really* do not want to set
|
|
* _POSIX_SAVED_IDS and do not want to clear POSIX_APPENDIX_B_4_2_2.
|
|
*/
|
|
#define POSIX_APPENDIX_B_4_2_2
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct setuid_args {
|
|
uid_t uid;
|
|
};
|
|
#endif
|
|
/* ARGSUSED */
|
|
int
|
|
setuid(p, uap)
|
|
struct proc *p;
|
|
struct setuid_args *uap;
|
|
{
|
|
register struct pcred *pc = p->p_cred;
|
|
register uid_t uid;
|
|
int error;
|
|
|
|
/*
|
|
* See if we have "permission" by POSIX 1003.1 rules.
|
|
*
|
|
* Note that setuid(geteuid()) is a special case of
|
|
* "appropriate privileges" in appendix B.4.2.2. We need
|
|
* to use this clause to be compatable with traditional BSD
|
|
* semantics. Basically, it means that "setuid(xx)" sets all
|
|
* three id's (assuming you have privs).
|
|
*
|
|
* Notes on the logic. We do things in three steps.
|
|
* 1: We determine if the euid is going to change, and do EPERM
|
|
* right away. We unconditionally change the euid later if this
|
|
* test is satisfied, simplifying that part of the logic.
|
|
* 2: We determine if the real and/or saved uid's are going to
|
|
* change. Determined by compile options.
|
|
* 3: Change euid last. (after tests in #2 for "appropriate privs")
|
|
*/
|
|
uid = uap->uid;
|
|
if (uid != pc->p_ruid && /* allow setuid(getuid()) */
|
|
#ifdef _POSIX_SAVED_IDS
|
|
uid != pc->p_svuid && /* allow setuid(saved gid) */
|
|
#endif
|
|
#ifdef POSIX_APPENDIX_B_4_2_2 /* Use BSD-compat clause from B.4.2.2 */
|
|
uid != pc->pc_ucred->cr_uid && /* allow setuid(geteuid()) */
|
|
#endif
|
|
(error = suser(pc->pc_ucred, &p->p_acflag)))
|
|
return (error);
|
|
|
|
#ifdef _POSIX_SAVED_IDS
|
|
/*
|
|
* Do we have "appropriate privileges" (are we root or uid == euid)
|
|
* If so, we are changing the real uid and/or saved uid.
|
|
*/
|
|
if (
|
|
#ifdef POSIX_APPENDIX_B_4_2_2 /* Use the clause from B.4.2.2 */
|
|
uid == pc->pc_ucred->cr_uid ||
|
|
#endif
|
|
suser(pc->pc_ucred, &p->p_acflag) == 0) /* we are using privs */
|
|
#endif
|
|
{
|
|
/*
|
|
* Transfer proc count to new user.
|
|
*/
|
|
if (uid != pc->p_ruid) {
|
|
(void)chgproccnt(pc->p_ruid, -1);
|
|
(void)chgproccnt(uid, 1);
|
|
}
|
|
/*
|
|
* Set real uid
|
|
*/
|
|
if (uid != pc->p_ruid) {
|
|
pc->p_ruid = uid;
|
|
setsugid(p);
|
|
}
|
|
/*
|
|
* Set saved uid
|
|
*
|
|
* XXX always set saved uid even if not _POSIX_SAVED_IDS, as
|
|
* the security of seteuid() depends on it. B.4.2.2 says it
|
|
* is important that we should do this.
|
|
*/
|
|
if (pc->p_svuid != uid) {
|
|
pc->p_svuid = uid;
|
|
setsugid(p);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* In all permitted cases, we are changing the euid.
|
|
* Copy credentials so other references do not see our changes.
|
|
*/
|
|
if (pc->pc_ucred->cr_uid != uid) {
|
|
pc->pc_ucred = crcopy(pc->pc_ucred);
|
|
pc->pc_ucred->cr_uid = uid;
|
|
setsugid(p);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct seteuid_args {
|
|
uid_t euid;
|
|
};
|
|
#endif
|
|
/* ARGSUSED */
|
|
int
|
|
seteuid(p, uap)
|
|
struct proc *p;
|
|
struct seteuid_args *uap;
|
|
{
|
|
register struct pcred *pc = p->p_cred;
|
|
register uid_t euid;
|
|
int error;
|
|
|
|
euid = uap->euid;
|
|
if (euid != pc->p_ruid && /* allow seteuid(getuid()) */
|
|
euid != pc->p_svuid && /* allow seteuid(saved uid) */
|
|
(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.
|
|
*/
|
|
if (pc->pc_ucred->cr_uid != euid) {
|
|
pc->pc_ucred = crcopy(pc->pc_ucred);
|
|
pc->pc_ucred->cr_uid = euid;
|
|
setsugid(p);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct setgid_args {
|
|
gid_t gid;
|
|
};
|
|
#endif
|
|
/* ARGSUSED */
|
|
int
|
|
setgid(p, uap)
|
|
struct proc *p;
|
|
struct setgid_args *uap;
|
|
{
|
|
register struct pcred *pc = p->p_cred;
|
|
register gid_t gid;
|
|
int error;
|
|
|
|
/*
|
|
* See if we have "permission" by POSIX 1003.1 rules.
|
|
*
|
|
* Note that setgid(getegid()) is a special case of
|
|
* "appropriate privileges" in appendix B.4.2.2. We need
|
|
* to use this clause to be compatable with traditional BSD
|
|
* semantics. Basically, it means that "setgid(xx)" sets all
|
|
* three id's (assuming you have privs).
|
|
*
|
|
* For notes on the logic here, see setuid() above.
|
|
*/
|
|
gid = uap->gid;
|
|
if (gid != pc->p_rgid && /* allow setgid(getgid()) */
|
|
#ifdef _POSIX_SAVED_IDS
|
|
gid != pc->p_svgid && /* allow setgid(saved gid) */
|
|
#endif
|
|
#ifdef POSIX_APPENDIX_B_4_2_2 /* Use BSD-compat clause from B.4.2.2 */
|
|
gid != pc->pc_ucred->cr_groups[0] && /* allow setgid(getegid()) */
|
|
#endif
|
|
(error = suser(pc->pc_ucred, &p->p_acflag)))
|
|
return (error);
|
|
|
|
#ifdef _POSIX_SAVED_IDS
|
|
/*
|
|
* Do we have "appropriate privileges" (are we root or gid == egid)
|
|
* If so, we are changing the real uid and saved gid.
|
|
*/
|
|
if (
|
|
#ifdef POSIX_APPENDIX_B_4_2_2 /* use the clause from B.4.2.2 */
|
|
gid == pc->pc_ucred->cr_groups[0] ||
|
|
#endif
|
|
suser(pc->pc_ucred, &p->p_acflag) == 0) /* we are using privs */
|
|
#endif
|
|
{
|
|
/*
|
|
* Set real gid
|
|
*/
|
|
if (pc->p_rgid != gid) {
|
|
pc->p_rgid = gid;
|
|
setsugid(p);
|
|
}
|
|
/*
|
|
* Set saved gid
|
|
*
|
|
* XXX always set saved gid even if not _POSIX_SAVED_IDS, as
|
|
* the security of setegid() depends on it. B.4.2.2 says it
|
|
* is important that we should do this.
|
|
*/
|
|
if (pc->p_svgid != gid) {
|
|
pc->p_svgid = gid;
|
|
setsugid(p);
|
|
}
|
|
}
|
|
/*
|
|
* In all cases permitted cases, we are changing the egid.
|
|
* Copy credentials so other references do not see our changes.
|
|
*/
|
|
if (pc->pc_ucred->cr_groups[0] != gid) {
|
|
pc->pc_ucred = crcopy(pc->pc_ucred);
|
|
pc->pc_ucred->cr_groups[0] = gid;
|
|
setsugid(p);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct setegid_args {
|
|
gid_t egid;
|
|
};
|
|
#endif
|
|
/* ARGSUSED */
|
|
int
|
|
setegid(p, uap)
|
|
struct proc *p;
|
|
struct setegid_args *uap;
|
|
{
|
|
register struct pcred *pc = p->p_cred;
|
|
register gid_t egid;
|
|
int error;
|
|
|
|
egid = uap->egid;
|
|
if (egid != pc->p_rgid && /* allow setegid(getgid()) */
|
|
egid != pc->p_svgid && /* allow setegid(saved gid) */
|
|
(error = suser(pc->pc_ucred, &p->p_acflag)))
|
|
return (error);
|
|
if (pc->pc_ucred->cr_groups[0] != egid) {
|
|
pc->pc_ucred = crcopy(pc->pc_ucred);
|
|
pc->pc_ucred->cr_groups[0] = egid;
|
|
setsugid(p);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct setgroups_args {
|
|
u_int gidsetsize;
|
|
gid_t *gidset;
|
|
};
|
|
#endif
|
|
/* ARGSUSED */
|
|
int
|
|
setgroups(p, uap)
|
|
struct proc *p;
|
|
struct setgroups_args *uap;
|
|
{
|
|
register struct pcred *pc = p->p_cred;
|
|
register u_int ngrp;
|
|
int error;
|
|
|
|
if ((error = suser(pc->pc_ucred, &p->p_acflag)))
|
|
return (error);
|
|
ngrp = uap->gidsetsize;
|
|
if (ngrp > NGROUPS)
|
|
return (EINVAL);
|
|
/*
|
|
* XXX A little bit lazy here. We could test if anything has
|
|
* changed before crcopy() and setting P_SUGID.
|
|
*/
|
|
pc->pc_ucred = crcopy(pc->pc_ucred);
|
|
if (ngrp < 1) {
|
|
/*
|
|
* setgroups(0, NULL) is a legitimate way of clearing the
|
|
* groups vector on non-BSD systems (which generally do not
|
|
* have the egid in the groups[0]). We risk security holes
|
|
* when running non-BSD software if we do not do the same.
|
|
*/
|
|
pc->pc_ucred->cr_ngroups = 1;
|
|
} else {
|
|
if ((error = copyin((caddr_t)uap->gidset,
|
|
(caddr_t)pc->pc_ucred->cr_groups, ngrp * sizeof(gid_t))))
|
|
return (error);
|
|
pc->pc_ucred->cr_ngroups = ngrp;
|
|
}
|
|
setsugid(p);
|
|
return (0);
|
|
}
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct setreuid_args {
|
|
uid_t ruid;
|
|
uid_t euid;
|
|
};
|
|
#endif
|
|
/* ARGSUSED */
|
|
int
|
|
setreuid(p, uap)
|
|
register struct proc *p;
|
|
struct setreuid_args *uap;
|
|
{
|
|
register struct pcred *pc = p->p_cred;
|
|
register uid_t ruid, euid;
|
|
int error;
|
|
|
|
ruid = uap->ruid;
|
|
euid = uap->euid;
|
|
if ((ruid != (uid_t)-1 && ruid != pc->p_ruid && ruid != pc->p_svuid ||
|
|
euid != (uid_t)-1 && euid != pc->pc_ucred->cr_uid &&
|
|
euid != pc->p_ruid && euid != pc->p_svuid) &&
|
|
(error = suser(pc->pc_ucred, &p->p_acflag)))
|
|
return (error);
|
|
|
|
if (euid != (uid_t)-1 && pc->pc_ucred->cr_uid != euid) {
|
|
pc->pc_ucred = crcopy(pc->pc_ucred);
|
|
pc->pc_ucred->cr_uid = euid;
|
|
setsugid(p);
|
|
}
|
|
if (ruid != (uid_t)-1 && pc->p_ruid != ruid) {
|
|
(void)chgproccnt(pc->p_ruid, -1);
|
|
(void)chgproccnt(ruid, 1);
|
|
pc->p_ruid = ruid;
|
|
setsugid(p);
|
|
}
|
|
if ((ruid != (uid_t)-1 || pc->pc_ucred->cr_uid != pc->p_ruid) &&
|
|
pc->p_svuid != pc->pc_ucred->cr_uid) {
|
|
pc->p_svuid = pc->pc_ucred->cr_uid;
|
|
setsugid(p);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct setregid_args {
|
|
gid_t rgid;
|
|
gid_t egid;
|
|
};
|
|
#endif
|
|
/* ARGSUSED */
|
|
int
|
|
setregid(p, uap)
|
|
register struct proc *p;
|
|
struct setregid_args *uap;
|
|
{
|
|
register struct pcred *pc = p->p_cred;
|
|
register gid_t rgid, egid;
|
|
int error;
|
|
|
|
rgid = uap->rgid;
|
|
egid = uap->egid;
|
|
if ((rgid != (gid_t)-1 && rgid != pc->p_rgid && rgid != pc->p_svgid ||
|
|
egid != (gid_t)-1 && 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);
|
|
|
|
if (egid != (gid_t)-1 && pc->pc_ucred->cr_groups[0] != egid) {
|
|
pc->pc_ucred = crcopy(pc->pc_ucred);
|
|
pc->pc_ucred->cr_groups[0] = egid;
|
|
setsugid(p);
|
|
}
|
|
if (rgid != (gid_t)-1 && pc->p_rgid != rgid) {
|
|
pc->p_rgid = rgid;
|
|
setsugid(p);
|
|
}
|
|
if ((rgid != (gid_t)-1 || pc->pc_ucred->cr_groups[0] != pc->p_rgid) &&
|
|
pc->p_svgid != pc->pc_ucred->cr_groups[0]) {
|
|
pc->p_svgid = pc->pc_ucred->cr_groups[0];
|
|
setsugid(p);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct issetugid_args {
|
|
int dummy;
|
|
};
|
|
#endif
|
|
/* ARGSUSED */
|
|
int
|
|
issetugid(p, uap)
|
|
register struct proc *p;
|
|
struct issetugid_args *uap;
|
|
{
|
|
/*
|
|
* Note: OpenBSD sets a P_SUGIDEXEC flag set at execve() time,
|
|
* we use P_SUGID because we consider changing the owners as
|
|
* "tainting" as well.
|
|
* This is significant for procs that start as root and "become"
|
|
* a user without an exec - programs cannot know *everything*
|
|
* that libc *might* have put in their data segment.
|
|
*/
|
|
if (p->p_flag & P_SUGID)
|
|
return (1);
|
|
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;
|
|
{
|
|
if (--cr->cr_ref == 0)
|
|
FREE((caddr_t)cr, M_CRED);
|
|
}
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct getlogin_args {
|
|
char *namebuf;
|
|
u_int namelen;
|
|
};
|
|
#endif
|
|
/* ARGSUSED */
|
|
int
|
|
getlogin(p, uap)
|
|
struct proc *p;
|
|
struct getlogin_args *uap;
|
|
{
|
|
|
|
if (uap->namelen > MAXLOGNAME)
|
|
uap->namelen = MAXLOGNAME;
|
|
return (copyout((caddr_t) p->p_pgrp->pg_session->s_login,
|
|
(caddr_t) uap->namebuf, uap->namelen));
|
|
}
|
|
|
|
/*
|
|
* Set login name.
|
|
*/
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct setlogin_args {
|
|
char *namebuf;
|
|
};
|
|
#endif
|
|
/* ARGSUSED */
|
|
int
|
|
setlogin(p, uap)
|
|
struct proc *p;
|
|
struct setlogin_args *uap;
|
|
{
|
|
int error;
|
|
char logintmp[MAXLOGNAME];
|
|
|
|
if ((error = suser(p->p_ucred, &p->p_acflag)))
|
|
return (error);
|
|
error = copyinstr((caddr_t) uap->namebuf, (caddr_t) logintmp,
|
|
sizeof(logintmp), (size_t *)0);
|
|
if (error == ENAMETOOLONG)
|
|
error = EINVAL;
|
|
else if (!error)
|
|
(void) memcpy(p->p_pgrp->pg_session->s_login, logintmp,
|
|
sizeof(logintmp));
|
|
return (error);
|
|
}
|
|
|
|
void
|
|
setsugid(p)
|
|
struct proc *p;
|
|
{
|
|
p->p_flag |= P_SUGID;
|
|
if (!(p->p_pfsflags & PF_ISUGID))
|
|
p->p_stops = 0;
|
|
}
|