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/*
getpeercred.c - function for determining information about the
other end of a unix socket
This file is part of the nss-pam-ldapd library.
Copyright (C) 2008, 2009, 2011, 2012 Arthur de Jong
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA
*/
#include "config.h"
#include <stdlib.h>
#include <unistd.h>
#include <sys/socket.h>
#include <sys/un.h>
#ifdef HAVE_SYS_UCRED_H
#include <sys/ucred.h>
#endif /* HAVE SYS_UCRED_H */
#include <errno.h>
#ifdef HAVE_UCRED_H
#include <ucred.h>
#endif /* HAVE_UCRED_H */
#include "getpeercred.h"
/* Note: most of this code is untested, except for the first
implementation (it may even fail to compile) */
int getpeercred(int sock, uid_t *uid, gid_t *gid, pid_t *pid)
{
#if defined(SO_PEERCRED)
socklen_t l;
struct ucred cred;
/* initialize client information (in case getsockopt() breaks) */
cred.pid = (pid_t)0;
cred.uid = (uid_t)-1;
cred.gid = (gid_t)-1;
/* look up process information from peer */
l = (socklen_t)sizeof(struct ucred);
if (getsockopt(sock, SOL_SOCKET, SO_PEERCRED, &cred, &l) < 0)
return -1; /* errno already set */
/* return the data */
if (uid != NULL)
*uid = cred.uid;
if (gid != NULL)
*gid = cred.gid;
if (pid != NULL)
*pid = cred.pid;
return 0;
#elif defined(LOCAL_PEERCRED)
socklen_t l;
struct xucred cred;
/* look up process information from peer */
l = (socklen_t)sizeof(struct xucred);
if (getsockopt(sock, 0, LOCAL_PEERCRED, &cred, &l) < 0)
return -1; /* errno already set */
if (cred.cr_version != XUCRED_VERSION)
{
errno = EINVAL;
return -1;
}
/* return the data */
if (uid != NULL)
*uid = cred.cr_uid;
if (gid != NULL)
*gid = cred.cr_gid;
if (pid != NULL)
*pid = (pid_t)-1;
return 0;
#elif defined(HAVE_GETPEERUCRED)
ucred_t *cred = NULL;
if (getpeerucred(sock, &cred))
return -1;
/* save the data */
if (uid != NULL)
*uid = ucred_geteuid(cred);
if (gid != NULL)
*gid = ucred_getegid(cred);
if (pid != NULL)
*pid = ucred_getpid(cred);
/* free cred and return */
ucred_free(cred);
return 0;
#elif defined(HAVE_GETPEEREID)
uid_t tuid;
gid_t tgid;
if (uid == NULL)
uid = &tuid;
if (gid == NULL)
gid = &tguid;
if (getpeereid(sock, uid, gid))
return -1;
/* return the data */
if (uid != NULL)
*uid = cred.uid;
if (gid != NULL)
*gid = cred.gid;
if (pid != NULL)
*pid = -1; /* we return a -1 pid because we have no usable pid */
return 0;
#else
/* nothing found that is supported */
errno = ENOSYS;
return -1;
#endif
}
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